Industrial boilers are generally steam boilers used for power generation or gas supply. For example, in a chemical fertilizer plant, steam can be vaporized, coal is used as raw materials, and synthetic fertilizers. This is a typical industrial boiler. As an important thermal power equipment, industrial boilers have propped up the sky of manufacturing.

According to different structures, industrial boilers can be divided into three types: fire tube type, fire tube type and water tube type.

1.Fire tube boiler
       It was an early boiler. There were only one or two fire pots in the pot for heating the pot water. There were burning devices in the fire pots. Due to the low thermal efficiency, large volume and steel consumption of fire tube boilers, production has basically ceased since the 1960s.

2.Fire tube boiler
       In addition to a fire tube, a number of smoke pipes are installed in a vertical or horizontal pot shell. The high-temperature flue gas generated by the combustion of fuel in the combustion chamber passes through these smoke pipes to heat the boiler water, and then is discharged into the chimney. Compared with the fire tube boiler, due to the large number of smoke pipes, the heating area is increased, the exhaust temperature is lower, the thermal efficiency is higher, the steel consumption and the boiler volume are smaller. The evaporation capacity of fire tube boilers is generally not more than 15 tons / hour, the working pressure is generally not more than 1.6 MPa, the thermal efficiency of coal-fired boilers is generally about 70%, and the more intelligent fuel gas boilers, the thermal efficiency can reach 85% -98 %about.

3.Water tube boiler
       Water tube boilers are mostly used in industrial industries with large capacity and high pressure requirements. They are divided into natural circulation and once-through boilers according to the different circulation methods. Natural circulation water tube boilers have single and double drums. After the convection tube bundle of the double-boiler water tube boiler, an energy saver is generally provided, and an air preheater is sometimes provided to reduce the exhaust temperature. The efficiency can reach 80% when burning coal, and it will be higher if it is fuel gas. There is no drum in the once-through industrial boiler, and the heating surface is composed of a tube coiled on the inner wall of the furnace and a convection tube bundle at the back. Feed water enters from one end of the pipe and steam exits from the other. Once-through industrial boilers are small in size and generally have a steam-water separator and an automatic control device.

Heating and heating boilers belong to the category of civilian life boilers. With the improvement of people's safety awareness and the popularization of centralized heating, since 2000, buildings have been heated with hot water as the heat medium, and steam boilers are not allowed. Generally speaking, the heating boilers we refer to are hot water boilers.

There are many types of heating and heating boilers, and their classification is mainly divided according to the type of fuel. They can be divided into electric heating boilers, oil heating boilers, gas heating boilers, coal-fired heating boilers, and biomass heating boilers. Oil-fired heating boilers and gas-fired heating boilers are the more common types of heating boilers.

Everyone needs to determine the boiler parameters according to their own needs. It must not be too small and the boiler supply cannot meet their own needs, and it must not be too large and cause waste of resources. Zhengzhou Fangkuai Boiler Co., Ltd. sorts out methods for determining parameters of steam boilers and hot water boilers for some industries that use boilers widely.

Most of the boilers required by industrial and mining enterprises for production are steam boilers, and the steam output by the boilers is mostly used in production that requires a certain amount of heat to meet the production process requirements, such as textile printing and dyeing, food sugar, rubber paper, Petrochemical and other industries. Therefore, according to the requirements of the production process, determine the saturated steam parameters of the boiler, and accurately determine the parameters of the saturated steam to ensure that the temperature required for production is constant.

Generally speaking, the pressure of the boiler is always higher than the saturated steam pressure required for production. The reason is to overcome the pressure loss in the pipeline or pipe network. Many users have also found that the pressure on the boiler nameplate is much greater than the pressure required for production. For example, many users have purchased a 13-pressure boiler, but in fact only use 5 gauge pressure or 6 gauge pressure operating pressure. Operating at such low pressures has an adverse effect on steam quality. Because the pressure decreases, the specific volume of the steam increases, and the flow velocity at the outlet greatly increases, which causes the phenomenon of steam carrying water to rise. The pressure required for general production plus the pressure drop required to overcome all pipeline resistance, plus a pressure margin of 25% to 30% is sufficient.

For hot water boilers required for heating and heating, the commonly used temperature parameters are the supply and return water temperatures of 95/70 ° C. At present, there are three types of domestic urban heating; thermal power plants, regional boiler rooms, and scattered small-capacity boiler rooms. The former two are centralized heating, and the district boiler room heating is the development direction. At present, the majority are scattered small capacity boiler rooms. For district heating, the high temperature hot water boiler, supply and return water temperatures will develop 130/70 parameters. At present, three grades of 95/70, 115/70, and 130/70 are available for selection in hot water boiler products. The operating pressure of hot water boilers in actual use is mostly lower than the design pressure, which is mainly limited by the original pipe network system.

How to determine the capacity of a boiler when choosing an industrial boiler is an important issue. Generally speaking, the output or capacity of the boiler should be determined according to the steam consumption or heating area in the production process and the heat supply required for domestic hot water. First of all, the user must find out the total load range; second is the peak situation, including the peak load duration, the frequency of the peak, that is, the periodicity of the peak, such as the number of monthly peaks, weekly, monthly, and winter and summer in a year The difference. After understanding the demand and peak of the boiler load, you can consider the equipment capacity and number of units. In the selection, we must also consider the problem of the amount of emergency shutdown.

The reserve capacity generally refers to a standby boiler. The standby boiler does not need to be started when the original boiler is working normally. If the original boiler fails and is shut down, the standby boiler must be started immediately. This needs to be determined according to the importance of the user itself. If the continuity requirements in production and use are high, the issue of standby equipment must be carefully considered.

The economic load of a general boiler is more than 75% of the rated load, so the actual load of the boiler in use should always be more than 50% of the rated load of the unit itself, which means that the equipment provided by the manufacturer is between 50% and 100% of the rated output. It should be stable and efficient. In the past, users often purchased too much margin for safety reasons, which caused the equipment to operate under low load for a long time, which was very uneconomical. Generally, for boiler rooms with a total capacity of 8 tons / hour or a thermal power of more than 6 megawatts (MW), three units are more suitable. Due to the difference between winter and summer, you can choose different output equipment. However, it is more convenient and economical to choose the same equipment for new boiler rooms in terms of operation, maintenance, and management. Such auxiliary arrangement of auxiliary equipment of boiler room can be reasonably arranged. If you consider the high and low peaks and the big differences between winter and summer, you can also choose two big and one small equipment. According to the needs of the new boiler room, you can choose more equipment than three, but it should not be too much. Instead of using many equipment, choose a higher capacity equipment. In the current situation of domestic equipment quality, it is necessary to consider standby units.

Enabling the operation of energy saving and emission reduction of industrial boilers can save a large amount of investment costs for enterprise units, and it can also save the tedious inspection of environmental protection departments.

For industrial boilers, whether they can achieve energy conservation and emission reduction depends on these measures. Zhengzhou Fangkuai Boiler Company will come to explain one by one for you.

1. Reconstruction of fuel supply device
       For oil-fired gas boilers, it is necessary to effectively control the ratio of fuel and air to achieve sufficient combustion. There should be neither too much nor too little fuel.

2.Transformation of combustion system
       The traditional industrial boiler combustion method is diffusion combustion. Such a combustion method is likely to cause uneven combustion temperature inside the boiler furnace, which may easily cause insufficient combustion of fuel, resulting in waste of fuel energy. Zhengzhou Fangkuai Boiler Co., Ltd. changed the combustion system of the industrial boiler to full premixed combustion. This type of combustion uses fuel and air to be mixed in advance, and then close to the combustion device, which can ensure that the temperature in the furnace is uniform throughout and avoid fuel combustion. Non-uniformity occurs.

3. Rebuild the overall structure of the boiler
       Many industrial boilers do not adopt a reasonable design structure when they are manufactured, which will also lead to a reduction in the thermal efficiency of the boiler and ultimately fail to achieve the purpose of energy saving.

4. Reconstruction of boiler auxiliary machine
       The frequency conversion combustion technology can be used to achieve dynamic and intelligent combustion of the boiler, which not only saves the trouble of the boiler worker every time adding fuel, but also makes the boiler and fuel delivery more compatible.

5. The automatic control system is adopted to adjust the output heat of the boiler in real time to achieve the purpose of energy saving.

6.Recovery condensate from boiler operation
       The industrial boiler can increase the operating efficiency by more than 10% after adding condensing technology, which is very energy efficient. However, such a boiler will also generate a lot of condensed water after operation. If the user does not use this part of condensed water, it will also cause energy waste. The temperature of the condensed water is generally around 100 ° C, which is very low compared to the boiler temperature, but there is also a lot of heat. You can recover this part of the condensed water and participate in the boiler for reuse.

7.Boiler replacement, replacement of old boilers with new boilers
       If the operation efficiency of the original boiler is very low, or the pollutants emitted are seriously exceeded, and the service life is long, we do not recommend that you continue to use or rebuild the original boiler. After all, the cost of such a boiler reconstruction It is also very high, and it is better to directly purchase a new fuel-gas industrial boiler that has high energy efficiency and low nitrogen emissions.

Performing a water pressure test before the boiler is officially started can grasp the problems existing in the boiler early and deal with them in a timely manner. Take oil-fired gas boilers for example.

The hydraulic pressure test of oil-fired gas boilers is generally divided into a hydraulic pressure test and a super-hydraulic test of rated working pressure. The overpressure test pressure of the boiler body is 1.25 times of the rated working pressure of the boiler shell or the rated pressure plus 0.4 MPa.

If one of the following situations occurs, our oil-fired gas boiler also needs to perform an overpressure water pressure test.
       1. Before the newly installed boiler starts trial operation;
       2. After the boiler's pressure parts have undergone major transformation or replacement;
       3. The boiler in operation is performed every six years (combined with overhaul).

If one of the following situations occurs, our oil-fired gas boiler needs to perform a working pressure and hydraulic test.
       1. Generally, after large or small repairs or rush repairs, the hydraulic pressure test of the working pressure is performed after the repairs;
       2. If the furnace is shut down for more than 30 days, a hydraulic pressure test of working pressure must be performed before ignition.

Previously we said that it was better to perform a hydraulic test for the sake of safety. However, whether it is a steam boiler or a hot water boiler, after the boiler is installed, a hydraulic pressure test (that is, water pressure) must be performed. After long-distance transportation, loading, unloading, and installation, collision and damage are unavoidable. Boiler defects can be found through hydraulic tests, and appropriate measures can be taken in time to ensure the safe operation of the boiler.

Full water is a certain danger for the steam boiler in operation. Once the steam boiler is full of water, the output steam will bring a large amount of water, or the water hammer in the steam pipeline will occur. To reduce the steam quality, it will also affect the normal gas supply of the boiler. In addition, if the consequences are very serious, it is the fouling of the superheater in the steam boiler, which causes damage to the boiler. If the boiler operators do not find and solve in time, the boiler is likely to have more dangerous accidents. So, when the steam boiler is full of water, how do you quickly solve it? Listen to the technical lecturer from Zhengzhou FANGKUAI Boiler Co., Ltd. to explain in detail for everyone, how to deal with steam boilers full of water quickly to minimize damage.

In order to keep the steam boiler away from water-filled accidents, we must first start from Sheung Shui.

For steam boilers, the hardness of the feed water is mainly required, which should be within 0.03 mmol / liter. In addition, in order to avoid the full water accident of the steam boiler, the standards on the superheater must be strictly in accordance with the requirements, etc., to carry out specific operations in this regard.

In a steam boiler, if there is a superheater, it can produce dry steam. However, if the condition inside the boiler deteriorates, it can only be saturated with steam.

For the various situations that the steam boiler will encounter during operation, the technicians of Fangkuai Boiler just gave a brief introduction to everyone from the situation of full water. I hope that it can help everyone to improve their knowledge and understanding of the steam boiler. We can apply what we have learned from time to time to avoid safety accidents in the boiler.

It is believed that many user units need to use boilers as a source of heat to drive the demand for heat production in the factory or in the living. But if you want to make the boiler work better for us, you need to pay special attention to the installation problem. Because even if the boiler is better, if there is any problem in the installation, the operating efficiency of the boiler will be greatly reduced.

There are a lot of issues that we need to consider before installing the boiler. The first is the consideration of the installation location. Because the boiler is used to provide thermal energy, the surface temperature is very high, so it should be avoided to contact the human body when installing the boiler. The choice of the installation location should be as far as possible at the corner or on the side, so as not to hinder the passage of people, this is the first consideration when installing.

Another problem to be noticed is ventilation, because the boiler will generate a lot of fumes during use. Even if each boiler has a special exhaust facility, it is still necessary to pay attention to ventilation during installation. Attention to ventilation has two advantages, the first is to facilitate the emission of smoke, the second is to maintain the temperature inside the boiler room, so that the temperature is too high, making people feel uncomfortable.

The horizontal steam boiler is a relatively classic type in the current boiler market. It adopts the horizontal design structure. The arched tube plate and the threaded pipe form a drum. The heat transfer efficiency is high, the pressure is fast, the output is sufficient, and the load is overloaded. Strong ability, not easy to accumulate in the pipe.

The welding joint of the horizontal steam boiler is treated by large-scale machining and special processing in the high-temperature zone tube bundle. The manufacturer will also carry out flaw detection treatment in the later stage to ensure that the weld is 100% qualified before the boiler can be shipped, which greatly guarantees the boiler. safety.

The horizontal steam boiler has a compact structure, small size and size, saves capital investment, and is easy to install. It can be operated by connecting valves, water and electricity and pipelines. Stable operation, convenient adjustment, unique anti-leakage design, long sealing time.

The dust, sulfur and nitrogen oxides contained in the flue gas of horizontal steam boilers are all pollutants that pollute the atmosphere. When not purified, the emission index can reach several times to several tens of times of the environmental protection regulations. Measures to control the discharge of these substances include pre-combustion treatment, improved combustion technology, dust removal, desulfurization and denitrification. The use of high chimneys only reduces the concentration of pollutants in the atmosphere near the chimney.

In the current boiler market, there are more and more types of gas-fired boilers using energy-saving technologies, and condensation technology is one of them. By adding a condenser at the end of the boiler, a large amount of latent heat is released when the high-temperature flue gas passes through the condenser, and is supplied to the boiler for reuse.

Condensed water refers to liquid water formed by water vapor (ie, gaseous water) during condensation, which is a physical change. Today, Fangfang Boiler will unveil the treatment of condensate for you!

1. There are two main reasons why gas boilers produce flue gas condensation water.
       (1) The water vapor in the flue gas condenses into water when it is below the dew point temperature;
       (2) The boiler has high thermal efficiency and low exhaust gas temperature. The exhaust temperature of the boiler under the rated load is slightly higher than the dew point temperature of the flue gas. Under the condition of long-term operation with low load, the flue gas temperature is lower than the flue gas dew point temperature, and condensed water will flow out from the tail heating surface of the boiler. , the boiler is discharged from the rear smoke box.

2. What are the components of gas boiler flue gas condensate?
       The gas boiler generates condensed water during operation. The main components of the condensed water include: water produced by natural gas combustion, sulfur oxides formed by combustion of sulfur in natural gas impurities, acidic substances formed in water, and nitrogen in the air under high temperature conditions. The nitrogen oxides formed by the oxygen in the air are dissolved in the acidic substances generated by the water.

3. There are too many condensed water in the gas boiler. How to deal with it?
       When the gas boiler is in operation, especially when the cold furnace is started, the flue gas condensed water is often generated at the heating surface of the boiler tail and the rear smoke box, so that the furnace worker mistakenly believes that the boiler leaks.
       The condensed water generated by the gas boiler during operation should be discharged out of the boiler in time, because if the condensed water accumulates too much, it will affect the normal operation of the boiler, which will cause water leakage at the connection between the rear smoke box door cover and the rear smoke box flange.
       Specific measures include:
       (1) The boiler is provided with a condensate drain at the rear smoke box
       In order to enable the condensed water to be discharged in time, the discharge port is generally not provided with a valve, and a water seal should be provided to prevent the flue gas from escaping from the tube.
       (2) Smoke box outlet setting takeover
       After the boiler flue gas exits the smoke box and enters the chimney, since the heat dissipation of the chimney is still cooling, the water vapor in the flue gas is still condensed on the chimney wall, forming small water droplets flowing down the chimney wall, so it should be in the smoke box. The outlet is set to allow the condensate to drain into the trench or any drainage system.
       Excessive condensate of gas boiler flue gas should cause concern. Although condensed water production is unavoidable, excessive condensed water is generated, which will inevitably affect the safe operation of the boiler.

4. Does the flue gas condensate of the gas boiler have any pollution problems? Do you need special treatment? According to the composition analysis of the condensed water, we can know that the condensed water is acidic. The pH value of condensed water is mainly related to the sulfur content of natural gas. At present, domestic natural gas is mainly from four atmospheric fields, and the sulfur content is unknown. If you are interested, you can buy some PH test paper to measure the PH value of the boiler condensate.
       In general, the condensate pH of a cast aluminum heat exchanger is slightly higher than that of stainless steel (equivalent conditions).
       But although the condensate has a certain acidity, it has little effect on the environment. Do not believe that the condensate is collected in a bucket, added with alkaline substances and then poured into the sewer.

Because the condensate is somewhat acidic, it is diluted very lightly after entering the sewer system, and its effect is minimal. Moreover, today's residential sewers are made of plastic pipes, and even condensed water that has not been diluted will not affect the pipeline.

So we can ignore the environmental impact of this condensate. There is no need for special handling.

Controlling boiler operating costs is a particular concern for units using gas boilers. In the operation of gas boilers, enterprise users can control the production cost by improving the combustion efficiency and thermal efficiency of the boiler. One of the key factors is that we must choose a powerful boiler manufacturer to purchase a boiler with excellent performance and advanced technology, and then reduce production by reducing the fuel consumption of the gas boiler without affecting the use effect. The purpose of the cost. The following are the recommendations given by the engineers of FANGKUAI Boiler.

1. Flue gas condensation heat recovery system: This system mainly reduces the heat generated by the gas boiler during the smoke exhaustion, and reduces the gas consumption without affecting the boiler's own thermal efficiency.

2. Climate compensation system: This system is adjusted according to indoor and outdoor temperature changes, so that the overall heating, heat release and building of the gas boiler are consistent, preventing excessive temperature difference between indoor and outdoor.

3. Heating system hydraulic balance: the average heating quality of all users, using this system, can directly save about 10% of energy.

4. Heating centralized control system: install the number of boilers according to the required heat load, and evenly distribute the heat load between the gas boilers, so that all boilers can reach the optimal state. The technology in this area is not mature enough in China. If you want better results, you can use imported boilers.

As a manufacturer specializing in the production of gas boilers and electric boilers, FANGKUAI Boiler has gone through more than 20 years of development. The energy-saving gas-fired boiler produced by the company adopts the technology of first pre-expansion and then full-welding, and finally re-expanding, which not only prevents the pipe gap corrosion, but also enhances the welding strength; uses a high heat transfer coefficient thread pipe to enhance the convective heat transfer effect. Reduce the exhaust gas temperature and improve the thermal efficiency of the boiler. With the industry-leading gas boiler products and perfect after-sales service, FangFeng Boiler is recognized and trusted by many gas boiler users.

If you have any requirements for gas boilers, please call the National Express 24-hour service telephone number 0371-60922096 directly, we will arrange professional engineers to answer your questions in the first time.

Gas-fired boilers use gaseous fuels as the main energy source to meet the needs of industrial manufacturing, production and life by outputting high-temperature steam or hot water.

Air consumption is an important indicator for assessing the overall quality of gas boilers. It is also one of the standards that users measure when purchasing boilers. This data will directly determine the input cost of the boiler operation. Only when the cost is controlled below a certain limit can the data be obtained. More benefits.

How to calculate the gas consumption of a gas boiler?
       Gas consumption = Gas boiler power /Fuel calorific value / Gas boiler heat value utilization.
       For example, we operate 1 ton gas boiler for 1 hour (full load). The boiler output is 600,000 kcal (fixed value), the natural gas calorific value is 36.22 MJ/Nm3 (fixed value), and the thermal efficiency is 92% (non-fixed value). According to the actual situation of the boiler, the calculation is carried out.


       Then, the gas volume required for the operating hours of a 1 ton natural gas boiler = 0.7 MW * 3600 s / 36.22 MJ / Nm3 / 92% = 75 m3 / h.
       Note: The actual power of the boiler is generally not equal to the rated power, so the consumption of gas is only a rough estimate. The specific data depends on the load of the boiler during actual operation.

What are the factors that affect the gas consumption of gas boilers?
       After obtaining the gas consumption data of the gas boiler, we also need to know what factors affect the gas consumption of the gas boiler.
       1. Boiler heating area
       Generally speaking, the larger the heating area is occupied in the whole boiler, the more heat is transferred to the boiler by the fuel combustion, and the fuel utilization rate is improved.
       2. Fuel calorific value and price
       The calorific value of different types of fuels will also vary. The calorific value of natural gas combustion is 36.22 MJ/Nm3, and the calorific value of liquefied petroleum gas is 46 MJ/Nm3; however, fuel costs should also be considered.
       3. Boiler thermal efficiency
       The thermal efficiency of the boiler is also closely related to the heating area. The larger the heating area, the better the heat transfer effect, which will increase the boiler thermal efficiency linearly, make the fuel utilization more complete, and the gas consumption cost less.
       4. Boiler output
       The output of a 1 ton boiler is 600,000 kcal, and this data is fixed.

How to reduce the gas consumption of gas boilers?
       There are two main factors that cause high gas consumption in gas boilers. One is the large boiler load; the other is the low thermal efficiency of the boiler. To reduce air consumption, we must start from these two aspects.
       1. Influence of boiler load
       In the absence of measuring instruments, we measure the heat output according to conventional knowledge. When the user's demand for the boiler is unstable, the boiler consumes more heat and the load increases.
       2. Influence of boiler thermal efficiency
       There are many influencing factors in terms of boiler thermal efficiency. We list some common points. You can check against your own boiler equipment.
       (1) The water quality of the boiler feed water is not good, and a lot of scale is accumulated after long-term operation, and the heat transfer efficiency of the heated surface is lowered. The thermal resistance of scale is 40 times that of steel, and the 1mm scale will increase fuel consumption by 15%.
       (2) Ashing on the outer surface of the heated surface also increases fuel consumption. The furnace can be turned on to check the ash scale, or it can be determined by detecting the exhaust temperature.
       (3) The boiler has a serious air leakage. Excessive cold air enters the furnace, and the oxygen content of the flue gas rises. When the smoke oxygen meter detects that the oxygen content of the flue gas exceeds 8%, excess air will appear and the heat loss will increase.
       (4) The gas quality is lowered and the concentration is lowered. This requires a professional boiler technician to carry out a specific analysis.
       (5) The burner automatically adjusts to failure. The burner mainly controls the combustion condition by automatically adjusting the "air-fuel ratio". If the sensor or computer program is unstable, although the combustion is normal, it will cause "chemical incomplete combustion heat loss". The combustion flame can be observed, the red fire represents poor combustion, and the blue fire represents good combustion.
      

The condensing gas boiler produced by FANGKUAI Boiler adopts advanced condensation technology to set up a condensing recovery device near the flue. When the high-temperature flue gas passes through the device, the latent heat part encounters the condensed water to release heat, which is provided to the boiler for absorption again. The thermal efficiency can be It is 98% high; it can save the company the fuel input cost of 50,000 to 100,000 yuan depending on the boiler capacity and maintenance quality.

Compared with traditional oil-fired boilers and coal-fired boilers, the advantages of gas-fired boilers are obvious, mainly reflected in the following aspects:
       1. The cost of manual and water-consuming electricity for gas boilers is low.
       2. The promotion of flue gas energy-saving or condensation technology in the tail of gas boilers will further increase its thermal efficiency. When the exhaust temperature of gas boilers is reduced below 80 °C, the efficiency can reach more than 95%.
       3, clean and environmentally friendly, the boiler occupies a small area, the failure rate is low, can significantly improve the use of the unit's on-site environment, the supply of sufficient and low prices, environmental requirements, high regional costs and other relative advantages.
       4. Since the boiler uses natural gas as a clean energy source, it does not generate soot and dust in the furnace during combustion, and its operating life is longer than other types of boilers.

However, due to its environmental advantages, natural gas has become more and more widely used in primary energy. The contradiction between supply and demand and the law of value will inevitably lead the country to take action and be linked to other primary energy price fluctuations. In addition, the shortage of natural gas and the incomplete construction of pipelines in some areas are also the reasons for its further promotion.

On the whole, the advantages of using gas boilers outweigh the disadvantages, and the promotion and use of gas boilers is still the trend of the times. As a professional supplier of gas boilers, FANGKUAI Boiler has more than 20 years of experience in the research and manufacture of gas boilers. In 2014, the low-nitrogen gas boilers of the APEC conference venues that were of national concern were provided by Fangfeng Boiler. The first low-nitrogen gas boiler put into use has made outstanding contributions to the technological innovation of gas boilers.

If you have any requirements for gas boilers, please call the 24-hour service telephone 0371-60922096, we will arrange a professional engineer to reply to you in the first time.