Every winter, there will be a lot of users asking about the "method of using natural gas hot water boilers". According to this question, Xiaobian asked our professional boiler technicians and summarized them below. You can refer to them.

Let us take the example of one of the FANGKUAI Boiler star products, the condensing gas hot water boiler.

1. Firstly, it is necessary to carry out safety inspections on the boiler, whether the valves of the valves are loose, whether the drain port of the drain is open or not, and so on, to ensure that the safety indexes of the boilers are at normal levels.

2. After connecting the waterway system, fill the system with water, and observe the water pressure change of the internal pressure gauge of the boiler. When the limit value is reached, stop the water injection and check whether there is loose leakage at the connection of each waterway.

3. Turn on the power, press the power button, let the water pump rotate, discharge the air in each heat exchanger coil or unscrew the manual exhaust valve at the front end of the heat exchanger to exhaust. After the exhaust water pressure drops, the water is replenished. Until the water pressure reaches the working range.

4. After filling the water, the pipe is connected well, the gas source is turned on, the ignition operation is performed, and the red signal light on the sub-control board is observed. After the power is turned on, the backlight is slowly flashed, and the ignition flashes rapidly after successful ignition.

5. The boiler has adjusted various parameters before leaving the factory, and the user does not need to adjust it at the site. However, if the local natural gas calorific value, air pressure or altitude is changed (compared with the plain area), it must be burned. System analysis and adjustment, the specific operation method needs to be analyzed and adjusted by the professional technicians according to the combustion system.

If you want to know more about gas hot water boilers, please continue to pay attention to FANGKUAI Boiler Co., Ltd., we will continue to provide you with troubleshooting.

First, the safety distance of the boiler in the boiler room
       The net distance between the boiler and the internal walls of the boiler house building shall be left to the furnace operator to operate, overhaul and arrange the auxiliary machine space.
       1. The front distance of the furnace
       Steam boiler 1 ~ 4t / h, hot water boiler 0.7 ~ 2.8MW, not less than 3.0m;
       Steam boiler 6 ~ 20t / h, hot water boiler 4.2 ~ 14MW, not less than 4.0m;
       Steam boiler 35 ~ 65t / h, hot water boiler 29 ~ 58MW, should not be less than 5.0m.
       Note: When it is necessary to replace the boiler tube in front of the furnace, the clearance before the furnace should meet the operational requirements. For steam boilers of 6 to 65 t/h and hot water boilers of 4.2 to 58 MW, when the furnace control room is equipped with the instrument control room, the clearance from the front end of the boiler to the instrument control room can be set to 3 m.
       2. The clearance of the channel on the side and back of the boiler
       Steam boiler 1 ~ 4t / h, hot water boiler 0.7 ~ 2.8MW, should not be less than 0.8m;
       Steam boiler 6 ~ 20t / h, hot water boiler 4.2 ~ 14MW, should not be less than 1.5m;
       Steam boiler 35 ~ 65t / h, hot water boiler 29 ~ 58MW, should not be less than 1.8m.
       In addition, when it is necessary to blow ash, set fire, remove slag, install or repair the spiral slag remover, the clear distance of the passage should meet the requirements of operation. It should be added that the distance between the highest operating point of the boiler and the lowest structure at the top of the boiler room should not be less than 2 m.

Second, the safety distance between boiler and production workshop
       The boiler room and the production workshop are connected at different speeds. The two must be independent, generally more than 5 meters.

Third, the safety distance between the boiler room and the building
       1. The safety distance between the boiler room and a type of high-rise building is 15 meters: one type of high-rise refers to 9-16 floors (the height is up to 50 meters);
       2. The safety distance between the boiler house and the multi-storey residential building is 13 meters: multi-storey buildings refer to houses of 2-9 floors and other civil buildings with a height of not more than 24m;
       3. The safety distance before the boiler room and the podium is 10 meters: the height of the podium connected to the high-rise is generally not more than 24m.

Note: The podium refers to an outbuilding that is connected to a high-rise building and has a height of no more than 24 meters outside the projection of the main building of the high-rise building.

Different types of boiler pressures are also different. According to the pressure, there are mainly low-pressure boilers, medium-pressure boilers, high-pressure boilers, ultra-high pressure boilers, subcritical boilers, critical boilers, supercritical boilers and ultra-supercritical boilers. The following are specific The pressure divides.

1. Low pressure boiler
       The outlet steam pressure is ≤2.45MPa, and the steam temperature is mostly saturated temperature or ≤400°C.

2. Medium pressure boiler
       The outlet steam pressure is in the range of 2.94-4.90 MPa. According to the current series of power plant boilers, the steam pressure at the outlet of the medium pressure boiler is 3.83 MPa and the steam temperature is 450 °C.

3. High pressure boiler
       The outlet steam pressure is 7.84-10.8 MPa. According to the current series of power plant boilers in China, the outlet steam pressure of the high-pressure boiler is 9.81 MPa, and the outlet steam temperature is 540 °C.

4. Ultra high pressure boiler
       The outlet steam pressure is 11.8-14.7 MPa. According to the current series of power plant boilers in China, the steam pressure at the outlet of the ultra-high pressure boiler is specified as 13.7 MPa, the steam outlet temperature is 540 ° C, and the minority is at 555 ° C.

5. Subcritical pressure boiler
       The boiler with an outlet steam pressure of 15.7-19.6 MPa. According to the current series of power plant boilers in China, the subcritical pressure boiler outlet steam pressure is specified as 16.7 MPa, the outlet steam temperature is 540 ° C or 555 ° C, and a few are 570 ° C.

6. Supercritical pressure boiler
       For boilers whose outlet steam pressure exceeds the critical pressure, the critical pressure of water vapor is 22.1 MPa. At present, the supercritical pressure of power station boilers is mostly between 25-27 MPa.

Most steam boilers have a certain pressure to output high-temperature steam while heating water. They are special pressure equipment specified in China and implement special operating specifications. Whether the operation meets the requirements will directly affect the life of the boiler, which is why some steam boilers have a short service life, but some can achieve an extremely long service life.

When the wrong operation causes the steam boiler to leak, don't panic, we can save it.

First, the cause
       1. The boiler feed water does not have oxygen removal. The high oxygen content in the water causes the oxygen to escape and accumulate in the gas space during the boiler operation.
       2. Improper daily operation, when the furnace is shut down, the water supply valve or the main pipeline steam valve is not closed in time, causing the air to enter the furnace, so that when the pressure is increased again, the invading oxygen is not removed in time, so that the oxygen is caused in a hot and humid environment. Long-term corrosion perforation of the pipe.

Second, the standard operation
       1. Boiler feed water is deoxidized according to GB1576-2008 standard to reduce oxygen content.
       2. When the furnace is shut down, stop the boiler when the boiler is at normal high water level and normal pressure, then close the inlet valve and the main air valve to prevent outside air from invading the furnace.
       3. When starting the furnace, first open the main air valve for exhausting. When the pressure reaches 0.1-0.15MPa, close the main air valve to remove the air in the furnace, and then open the main air valve to supply air when the rated working pressure is reached.
       4. Strengthen valve maintenance and maintain rigor.

When purchasing gas boilers, boiler operating efficiency and service life are important reference indicators. However, to achieve the boiler operating efficiency and service life double standards, not only to choose a good quality gas boiler is so simple, it is also very important to carry out regular maintenance work in the later stage of boiler operation.

This is mainly due to differences in gas quality and water quality in different regions and different enterprises.

1. Gas quality difference
       Natural gas and liquefied petroleum gas are relatively pure gas sources. Artificial gas is relatively poor. It has many internal impurities, and its composition is not stable. The calorific value is low, which has a great impact on equipment operation and life.

2. Water quality differences
       China has a large land area, and there are large differences in water quality. The content of calcium and magnesium ions in water is different. Although the water used in boilers is treated softened water, it is not easy to scale, but softening only reduces the content of calcium and magnesium ions in tap water. And can not be completely eliminated. When water is heated, calcium, magnesium, iron ions, etc. in the water are rapidly combined with carbonate, silicate, hydroxide ions, etc. in the water to cause scales such as calcium carbonate and magnesium silicate, and are firmly attached thereto. The inner wall of the heat exchanger and the pipeline causes the heat exchange effect of the system to be deteriorated, the pipe diameter is reduced, the water flow is not smooth or blocked, and the energy consumption is increased, and the boiler water pump is clogged and the water flow is not smooth, and the fault is easy to occur. The heat exchanger is also easily damaged at high temperatures of the flame, thereby shortening the service life of the boiler water circulation system equipment.

Industrial gas boilers have a long service life, generally 10-20 years, but to achieve such a long service life and good operating results, maintenance and repair processing is essential. Among them, water treatment is an important step.

The influent of industrial gas boilers must ensure good purity. This is mainly to prevent the boiler from generating scale under long-term high-pressure and high-temperature operation.

The purpose of gas boiler water treatment is to remove the calcium and magnesium ions which are easy to scale in the boiler, reduce the degree of boiler fouling, ensure the heat exchange effect of the boiler, and improve the thermal efficiency.

The process of water treatment is as follows:
       1. Pretreatment
       When the raw water of the gas boiler is surface water, the purpose of the pretreatment is to remove suspended solids, colloids and organic matter in the water. Usually, a coagulant (such as aluminum sulfate) is added to the raw water to make the above-mentioned impurities aggregate into large particles, sink by their own weight, and then filter into clean water. When groundwater or urban water is used as make-up water, the pretreatment of raw water can be omitted and only filtered. Commonly used clarification equipments include pulsed, hydraulically accelerated and mechanically agitated clarifiers; filtration equipment includes siphon filters, valveless filters, and single-flow or dual-flow mechanical filters. In order to further remove organic matter from the natural gas boiler water, an activated carbon filter may be added.
       2. Soften
       Gas boilers use natural or artificial ion exchangers to convert calcium and magnesium hard salts into hard-free salts to prevent calcium and magnesium hard scale from forming on the inner wall of boiler tubes.
       Water containing calcium and magnesium bicarbonate and having a high alkalinity can also be solved by sodium hydrogen ion exchange or by pretreatment (such as lime addition).
       For some industrial boilers, such treatment is usually sufficient, although the salinity of the feed water does not necessarily decrease significantly.
       3. Desalting
       With the continuous improvement of gas boiler parameters and the emergence of DC boilers, it is even required to remove all salt in the boiler feed water. At this time, it is necessary to use a method of desalting.

Condensing gas boilers are the star products that replace traditional coal-fired boilers and are now sold worldwide. However, there are still many users who have doubts in their minds and do not know how to improve the quality of their own condensing gas boilers. FANGKUAI Boiler has been researching condensing gas boilers for many years. It is specially designed for you to summarize the following three main factors affecting the working quality of condensing gas boilers.

First, the matching of equipment parameters and specific environment.
       The high degree of matching between the condensing boiler and the environment is essential to ensure the stability of the system. When purchasing the condensing gas boiler, the user must first understand the parameters of the various interfaces of the boiler, such as the thermal energy value, the size of the pipeline, the available space area, etc. Combined with the appropriate condensing boiler and the original thermal energy system, it can ensure that the condensing boiler is consistent with the actual use environment.

Second, Operate the condensing gas boiler correctly according to the instructions.
       The working quality of the condensing gas boiler is also related to the operation method. When the operator's adjustment value of the boiler parameters is inconsistent with the environment or the order of different operations is disordered, it may also cause the system to be stuck during the use of the condensing boiler. Excessive condensate, insufficient pressure, or abnormal temperature changes. Therefore, it is best to have professional guidance and strict operation according to the instructions before and during use of the condensing boiler.

Third, the maintenance and maintenance of the condensing gas boiler.
       Regular maintenance and maintenance of the condensing boiler is also the main reason for the quality of its work. The boiler should be regularly inspected and maintained during operation. After the boiler is shut down, it must be maintained. This will ensure that the boiler can operate normally when the boiler is used again, thus maintaining the long service life of the boiler.

In the operation process of the condensing boiler equipment, the equipment will be abnormally faulted due to various factors. The correct operation and maintenance of the equipment by the operator is the basis for ensuring the stable operation of the condensing boiler, and the manufacturer should be professional at regular intervals. The technical support personnel go to the maintenance inspection and comprehensively train the operators so that the operator can make timely protection measures when the equipment is abnormal.

The vacuum boiler mainly refers to the micro-negative pressure boiler whose internal gas pressure is lower than the external atmospheric pressure. The lower the gas pressure, the lower the boiling point, so that the water boils at low temperature and generates steam, and the overall efficiency of the boiler is higher.

Vacuum boilers on the market today can be divided into two categories according to fuel.

First, electric heating vacuum boiler.
       When the electric heating vacuum boiler is operated, its internal environment is in a vacuum state. At this time, the oxygen in the intermediate medium water is discharged to the outside of the electrothermal vacuum phase change boiler, so that oxidative corrosion is not caused in the boiler, which may cause damage to the equipment. At the same time, the material of the heat exchanger part of the electric vacuum hot water boiler is made of stainless steel and will not corrode. In addition, the electric vacuum hot water boiler only needs to add a small amount of heat medium water at a time, and it will not increase or decrease during operation, so there is no scale inside.

Second, fuel (gas / coal) vacuum boiler.
       Most of these vacuum boilers use imported burners, which have high combustion efficiency and extremely low noise and exhaust emissions. Internally, an exchanger made of stainless steel is used to ensure high heat exchange efficiency and to ensure clean water quality. At the same time, its smoke pipe is equipped with a spiral spoiler to improve heat transfer efficiency and reduce operating costs. In addition, it adopts a square structure as a whole, and the boiler and the heat exchanger are designed in one piece, which makes the structure compact and small in appearance.

Through the above classification of vacuum boilers, and to illustrate the characteristics of different categories, so that everyone knows their relevant knowledge. This part of the knowledge is the basic knowledge of the purchase of vacuum phase change boilers, we need to keep in mind, in order to make the most suitable choice when choosing the purchase, choose the boiler equipment.

The popularity of national energy-saving and environmental protection ideas has led to significant changes in all walks of life. When enterprises purchase boiler equipment, they will also prefer energy-saving and environmentally-friendly boilers. Condensing boilers are undoubtedly the representative products.

However, in constant comparison, we will find that no matter which brand, the condensing boiler is much more expensive than the ordinary boiler. What is the reason? What is the difference between the two? Today, we compare the following two aspects from the following three aspects. What is the difference between the two, and where is the condensing boiler?

1. Condensing furnace has higher thermal efficiency
       The water generated by the combustion of ordinary boiler fuel in the superheated state of the flue gas is lost with the flue gas from the chimney, resulting in a low thermal efficiency of the boiler. The condensing boiler fully recovers the sensible heat in the flue gas and the latent heat of condensation of the water vapor, and the thermal efficiency is extremely high, which is very energy-saving.

2. The life of the condensing boiler is significantly higher than that
       Due to the design problems of key parts such as combustion chambers and heat exchangers, and the domestic water quality and gas quality, the service life of ordinary boilers cannot meet the design requirements. The service life of some European purely imported boilers is generally five years. Brands can go beyond imported brands. The service life of condensing boilers that are popular with customers is generally about 4-5 times. This is because of its revolutionary product working mode, the life expectancy is significantly ahead of ordinary boilers.

3. The condensation furnace is extremely difficult to form scale
       Ordinary boiler: The piping system is often heated, so it is easy to form scale, which is more likely to damage the equipment. In order to solve the scale problem, most customers have to use a soft water machine. Condensing boilers use a new mixed-water system because of the new mixed-heat combustion. Therefore, compared with ordinary boilers, the condensing boiler does not have to worry about scale.

The above is the difference between FANGKUAI Boiler and the common boilers. From the above comparison, we can know that the performance of the condensing boiler is more prominent in terms of energy-saving, service life and post-cleaning. However, the price of the condensing boiler is not low, because it is recommended that you still need to purchase products according to your own budget.

To put it bluntly, to improve the thermal efficiency of the condensing boiler is to save money for the enterprise. However, what can be done to improve the thermal efficiency of the condensing boiler. Based on years of experience in the boiler industry, FANGKUAI Boiler concluded that boiler efficiency and pipe network transmission efficiency are the key to implementing energy conservation, and that reasonable use of machinery and equipment in strict accordance with relevant points can achieve better heating effect and improve The efficiency of the equipment, and consumers want to more reliably improve the efficiency of the heating of the condensing boiler should also follow this principle.

1. Improve boiler efficiency.
       Condensing boiler efficiency is not the rated efficiency of a single boiler, but the seasonal efficiency of the condensing boiler group (group). In order to improve the seasonal efficiency, it is necessary to minimize the number of starts, stops and standby time of each condensing boiler during the heating period. This is because each time the boiler is started and stopped, it is subjected to purging to consume heat. In the standby time, the condensing boiler is equivalent to a large radiator and also causes heat loss. In order to improve the seasonal efficiency of the boiler group (group), the design selection configuration is very important. When selecting the model, it is necessary to consider how the boiler combination has better variable load regulation capacity and promote the minimum output of the boiler to match the minimum load.

2. Improve the efficiency of pipe network transportation.
       There are three factors affecting the efficiency of the condensing boiler pipe network, namely heat loss caused by heat preservation, leakage and hydraulic imbalance. The heat loss caused by the imbalance of the outer pipe network and the vertical imbalance of the heating system is considerable. The horizontal imbalance of the outer pipe network of the condensing boiler and the heat loss caused by the vertical misalignment of the indoor heating system are large. Therefore, in order to improve the efficiency of the condensing boiler, it is necessary to improve the efficiency of the pipe network transportation. Nowadays, the cost of energy is high, and it is very important to reduce the loss of heat loss in the condensing boiler network. In order to reduce the heat loss of the pipe network, the condensing boiler should adopt a hydraulic balance system and a room temperature control system.

The above is the principle of improving the efficiency of the condensing boiler summarized by FANGKUAI Boiler. In addition, the efficiency of each condensing boiler needs to be improved. For this reason, it is best to choose a proportional adjustment burner for the condensing boiler. At the same time, it is required that the commissioning work of the manufacturer must be standardized and in place, and based on the test report. Only in this way can the average operating efficiency of the boiler be close under normal load conditions. Rated efficiency.