To say that the market price of a 2-ton gas-fired steam boiler is mainly determined according to the boiler main engine, auxiliary equipment, installation cost, freight and other expenses. Different boiler manufacturers, different operating modes, using different materials and different structures of stoves, the final boiler prices are different. Among them, the cost of the boiler body is relatively fixed, and the cost of auxiliary equipment depends on the brand selected by the company. The installation cost and freight must be negotiated with the manufacturer.

When purchasing boilers, many users will find that the prices of gas-fired steam boilers from different manufacturers vary greatly. In fact, you can use this short answer: If you want to buy a car, there are thousands of configuration ranges for different brands. The prices of boilers with different configurations and different efficiencies are of course different.

Therefore, the boiler is the same. Although the steam is the same, the steam boiler is also 2 tons, which can produce 2 tons of steam per hour, that is, whether the output is sufficient.

In addition, it also produces two tons of steam and how much natural gas is consumed. Of course, this is firstly related to the commissioning of the combustion chamber, but it is also mainly related to the technical heating area of ​​the boiler.

The service life of the boiler can not be used for 2-3 years, at least 15 to 20 years, and the design service life is 20 years. The quality of the boiler material directly affects the service life of the boiler, the thickness of the furnace wall and the thickness of the pipe.

Users of gas-fired steam boilers generally choose to use natural gas as fuel, because my country's current natural gas transfer projects have become more popular, and natural gas can be easily used in most areas. For users, it is very important to use gas-fired steam boilers correctly to prevent natural gas leakage.

The main components of natural gas used in gas steam boiler rooms are: methane content of 98%, propane content of 0.3%, butane content of 0.3%, nitrogen content of 1% and other substances; explosion limit: 5% to 15%.

When the concentration of natural gas in the air exceeds 15%, it will cause hypoxia and neurological damage, resulting in respiratory paralysis, coma and even death. A gas explosion is an instantaneous combustion of high-temperature and high-pressure gas up to 3000℃, and the explosion shock wave speed can reach 300 m/s, causing great damage.

Regarding the prevention of the leakage of the membrane water wall pipe of the gas steam boiler, the cause of the leakage should be investigated, and the following preventive measures should be proposed based on the inspection results:
       (1) Clean up the scale and slag accumulated inside the boiler to avoid the formation of a strong alkaline environment in the local position of the boiler;
       (2) It is recommended that the boiler should avoid long-term low-load operation to improve the water circulation state. The load should be kept at about 80% as the best, so as to prevent part of the water wall tube bundle from stagnating in soda;
       (3) The water level meter and the secondary meter display are inconsistent, so adjustments should be made to prevent the boiler from running at a high water level.
       (4) According to the requirements of the specification, for steam boilers with a rated evaporation capacity ≥4 t/h, the boiler water quality analysis shall be conducted at least once every 4 hours. When the boiler water quality is abnormal, the frequency of laboratory tests should be increased to keep the boiler water quality indicators in a qualified state for a long time.

According to my country's regulations: gas-fired steam boilers are special equipment, so everyone must operate in strict accordance with the specifications when using gas-fired steam boilers to avoid safety accidents. Regular inspections of gas-fired steam boilers are very important. Zhengzhou Fangkuai boiler manufacturers explain some of the problems that are easy to find during regular inspections of gas-fired steam boilers to help everyone use the boiler better.

The problems of internal inspection: one is the existence of cracks, and the other is the deformation of some compressed parts. The first problem is a major obstacle to the operation of the boiler. When necessary, welding or replacement is the main way to solve it. To avoid corrosion cracks, it is necessary to strengthen the monitoring of water quality in daily operation. The second type of problem is generally caused by excessive temperature, uneven heating, and insufficient component strength. Strengthening the management of water quality and doing a good job in timely drainage can effectively reduce component deformation.

The inspection methods mentioned in the regular inspection probably include visual inspection, non-destructive inspection, light inspection, etc. Visual inspection: A method to observe whether there is a problem with the boiler by eye. This method is suitable for the condition that no other equipment exists in the early stage of the boiler inspection. When the boiler has obvious external defects, the visual inspection method is more suitable. Compared with other inspection methods, the visual inspection method has the advantages of simple and intuitive, but the visual inspection method has certain requirements on the technical level of the inspectors. Non-destructive testing (NDT) refers to the thermal, electrical, acoustic, magnetic, optical and other reactions caused by the abnormal structure or defect of the material without damaging the performance of the measured object and the internal structure of the measured object. Using physical or chemical methods, using modern technology and equipment, the internal and surface structure, performance, state and type, performance, quantity, shape, location, size, distribution and changes of inspection and testing methods have been studied. Non-destructive testing is generally divided into ultrasonic testing, magnetic particle penetration, X-ray testing, etc. Magnetic particle testing is suitable for boiler parts that are easily magnetized and easily demagnetized, and has incomparable advantages over visual inspection. For the fillet welds of boilers, ultrasonic testing is generally used. This method can be used to detect whether the weld fusion meets the standard. X-ray inspection can accurately identify the internal defects of the boiler structure, and objectively evaluate the internal defects through the radiographic film.

If the gas steam boiler is properly maintained, the service life is very long, and it can even be used for ten or twenty years.

Matters needing attention in the operation of gas-fired steam boilers, because most of the steam boilers used by enterprises and units use gas as fuel, so everyone must pay more attention to the safety of the boiler. In the process of using the boiler, you must strictly follow the operating procedures to check And deal with it to prevent unexpected situations.

Gas is a flammable, explosive, and toxic gas. It has no color. Although it has a certain smell, it is difficult to detect in time by smell. If gas leaks into the furnace or air that is out of service, it will cause blasting. Therefore, the gas pipeline must be strictly tested for leaks. The furnace must have the necessary interlocking maintenance control system. The boiler room must have gas leakage monitoring and alarm devices and ventilation equipment. Use explosion-proof electrical appliances. The boiler should have a strict starting sequence control system. Before burning the gas boiler, it is necessary to carefully purge the furnace and flue to remove the combustible gas that may accumulate in the furnace. Boiler burners must be equipped with flameout safety maintenance devices. Once flameout occurs, it is also necessary to purge and follow normal combustion procedures before secondary combustion. In addition, the gas is transported by pipeline and there is no backup fuel. Once the gas pipeline breaks or the gas pressure is too low, it will cause the boiler to stop.

In our country, steam boilers are special equipment. Because the boiler has a certain pressure, you must pay more attention to safety issues during use. What are the details that need to be paid attention to during the use of steam boilers? This is a question that many users care about. The boiler technical engineer of Zhengzhou Fangkuai Boiler Factory will tell you the answer.

During the operation of the boiler, professional personnel are required for debugging. There are also many precautions during operation. If some parts are improperly operated, it is likely to cause irreparable losses to the boiler. Therefore, for enterprises, it is necessary to have a detailed understanding of some precautions before or after use.

The safety valve on the steam boiler cannot be adjusted arbitrarily. When the pressure gauge reaches over 80% of the agreed working pressure, the safety valve should be vented once. It is forbidden to tie or embed the valve stem. After the steam boiler is pressurized, check whether the steam valve is active, and always pay attention to the water level to keep it at 2/3 of the water level gauge.

Steam boiler water must be softened, kept clean, and contain no grease. The outside of the glass tube of the water level gauge should be equipped with a reinforced protective cover, and the outside should be kept clean. Each shift should be washed once to observe whether the water level in the water level table can rise or fall rapidly. If you see stagnant water panels in the water level gauge during operation, you should find out the cause immediately to avoid false water levels. Before starting a fire in a steam boiler, check whether the water pipes, steam pipes, pressure gauges, safety valves, water level gauges, drain valves, etc. of all valves are in a perfect state. When the furnace is urgently shut down, the combustion should be stopped first, the air door should be closed, the furnace door and the vent valve should be opened, and it is forbidden to add water to the furnace immediately due to water shortage.

In recent years, the frequency of use of gas-fired steam boilers has become higher and higher. This is mainly because this type of boiler is very environmentally friendly and its operating efficiency is also very high. It is completely integrated with energy saving and environmental protection. Zhengzhou Fangkuai boiler manufacturers found in the process of contacting users that many users are not very familiar with whether their own enterprises need to use gas-fired steam boilers. We will explain the industries in which gas-fired steam boilers can be used.

In the scope of application of gas-fired steam boilers in life, boilers mainly produce hot water and steam. For many enterprises, steam is the most used. There are many close relationships with boilers in life. Therefore, we need to have a general understanding of the scope of application of gas-fired steam boilers in life. The main classifications of gas steam boilers are:

1. After the heat exchanger, the heat of the steam is converted into water, and then the water is heated, and then used for heating, bathing and production.

2. It is used for disinfection in food processing, pharmaceutical industry, filling bottles, etc., and can be used for meat and steaming in the food industry. Brewing is also made with steam.

In addition, in the petrochemical industry, steam can heat oil and add fluidity. Steam is also used in the petrochemical production process.

In some import and export enterprises, gas-fired steam boilers are widely used, such as foam boards for thermal insulation, which produce steam to heat raw materials for foaming. Furniture made of wood must be dried with steam to make furniture. The aerated bricks of the building should also be dried with steam, and can also generate electricity and so on.

Users who are using steam boilers have noticed that when the boiler is difficult to make up water, the boiler should be checked in time to find the problem and solve it. There is also a certain way to solve the problem of water supplementation. Let Zhengzhou Fangkuai boiler manufacturer tell you the answer.

For steam boilers that have difficulty in making up water, it is generally necessary to analyze whether the water supply is difficult or the water is fast. If the water supply is difficult, you can first consider whether there is a problem with the water pump, and whether the sewage valve is not closed tightly or whether there is a leak on the boiler body.

The main reasons for the difficulty of making up water for steam boilers are as follows:

1. The head of the feed water pump drops. Due to the internal leakage and wear of the water pump, the pump head naturally drops. You can close the water outlet of the water pump to see if the pressure gauge reaches the pump parameters. If it does not, it means the pump lift drops;

2. The resistance of the water supply pipeline is increased. The main problems are the scaling of pipes and the failure to open the water supply control valve. Disassemble the regulating valve and check;

3. The resistance of the economizer becomes larger. Mainly caused by scaling and leakage on the inner wall of the economizer. Disassemble the economizer elbow to see;

4. Due to the scale, the water outlet on the water distributor in the upper drum sticks to the water scale. This is a common fault. You can open the upper drum to check;

5. It is also a problem that is not easy to find, that is, the sewage valve is not closed tightly or the continuous sewage discharge volume increases. Touch the regular blowdown pipe. If it is very hot, it means that the boiler is losing water, which will also be reflected in the boiler water supply difficulties.

If it is a steam boiler, the water level drops faster than usual. Check whether the blowdown valve is closed tightly and whether the heating surface pipe on the boiler body has water leakage (corrosion perforation).

The heating season of 2020 is coming. For the general public, it is a very happy thing to feel warm in the cold winter. For heating companies, there are many things to consider. Heating area, heating method, heating method, etc., are all issues that need to be considered.

According to statistics from the Zhengzhou Fangkuai boiler manufacturer, most heating companies and heating units currently use hot water boilers for heating instead of steam boilers. Let's take a look at why we prefer to use hot water boilers for heating and why it is more energy-efficient and environmentally friendly to use hot water boilers for heating.

Generally, hot water boilers are used for heating, except for those that require less production processes to use steam. Because it is more energy-saving and environmentally friendly than using steam boilers. First of all, in terms of fuel consumption, hot water boiler heating saves 20-40% of fuel compared with steam boiler heating. This amount is very considerable. There are two reasons to summarize: one is that there is no heat loss due to condensate and secondary transpiration; the other is that the hot water heating pipeline is selected with special heat preservation materials, and the pipeline is as thin as possible under the condition of satisfactory demand, and the heat loss is small. . Relatively speaking, the heat loss caused by steam leakage in steam heating pipes is relatively large.

Hot water boilers require only a few regular blowdowns. Another advantage of hot water heating is that it can flexibly adjust the quality and temperature of hot water. When the outdoor temperature is low, it is necessary to increase the temperature of the hot water to meet people's needs. When the outdoor temperature is high, The ability to lower the temperature of the hot water not only satisfies people's needs, but also achieves the effect of energy saving and environmental protection. And its system repair costs are also low. Hot water boilers can provide heating for residential areas tens of kilometers away. For example, the hot water boilers launched by Zhengzhou Fangkuai boiler manufacturers have a good performance in this respect.

After purchasing a steam boiler, many users do not allow the boiler to run continuously throughout the year. They will decide whether they need to shut down or restart the boiler according to their company's demand for steam. So, what preparations need to be done before restarting the steam boiler? Zhengzhou Fangkuai boiler manufacturer reminds everyone that ventilation and purging must be carried out. As for the reason, let's look down.

Ventilation and purging before the start of the steam boiler is to avoid the remaining combustible gas or pulverized coal in the furnace after the previous shutdown. It may also be because the fuel system is not tight during the shutdown that the combustible gas or pulverized coal leaks into the furnace. When burning, once the torch is inserted into the furnace, if the concentration of combustible gas or coal powder is within the blasting limit, it will cause the furnace to blast, damage the furnace wall, and even cause personal injury. Before burning, start the induced and blower fans, insist on 10%-25% of the rated air volume, and control the ventilation time at about 5 minutes.

Although ventilation with large air volume cannot completely remove the combustible gas or coal remaining or leaking into the furnace, it can dilute the concentration of combustible gas or coal in the furnace to a lower limit far less than the blasting limit, and then ensure the boiler combustion Time equipment and personal safety. After the ventilation is over, the combustion should be carried out as soon as possible to avoid leakage of the fuel system, and the concentration of combustible gas or coal powder in the furnace will rise again to the blasting scale.

When you purchase steam boilers, you must have heard a suggestion from many boiler business personnel: equip the boiler with softened water treatment equipment. Why do business people emphasize water softening equipment many times? Let Zhengzhou Fangkuai boiler manufacturer tell you the answer.

First of all, we need to have a simple understanding of water softening equipment. Water softening equipment for steam boilers can also be called full-automatic sodium ion converters using ion exchange principles to remove calcium, magnesium and other scaled ions in the water. When the raw water containing hardness ions passes through the resin layer in the AC, the calcium and magnesium ions in the water will be replaced with the sodium ions adsorbed by the resin. The resin adsorbs the calcium and magnesium ions and the sodium ions enter the water, thus flowing out from the AC. Water is softened water with hardness removed.

Because the hardness of water is mainly composed and indicated by calcium and magnesium, cation exchange resin (water softener) is generally used to replace the Ca2+ and Mg2+ (the main components of scale) in the water. With the addition of Ca2+ and Mg2+ in the resin, the resin The effectiveness of removing Ca2+ and Mg2+ gradually decreases. After the resin absorbs a certain amount of calcium and magnesium ions, it must be regenerated. The regeneration process is to wash the resin layer with salt water in the salt box to replace the hardness ions on the resin, and then discharge the resin out of the tank with the regeneration waste liquid. It has recovered its softening communication function.

The working mode of the gas steam boiler is a device that uses the high heat required when the gas generates heat, and then burns the gas sufficiently. In the process of gas combustion, it needs to be mixed with a large amount of air, but it can be burned through different methods. Zhengzhou Fangkuai Boiler Factory has summarized the three combustion methods of gas-fired steam boilers. After comparison, you can see that the boiler using which combustion method is more suitable for your needs.

One is the diffusion combustion method, which does not mix in advance, but diffuses the gas at the nozzle mouth and then burns it. This kind of combustion method of gas boiler can achieve sufficient stability, and does not have high requirements for burning appliances, and the structure is simple and simple. However, due to the long flame, incomplete combustion is very simple, and carbonization is very simple in the heated area.

The other is a partial air combustion method that requires premixing. Part of the air and gas are mixed in advance, and then burned abundantly. The advantage of using this combustion method is that the burning flame is clearer and the thermal efficiency is higher; but the disadvantage is that it is unstable during combustion and requires higher control of combustion components. If it is a gas burner, it is very necessary to choose this kind of combustion method.

There is also a flameless combustion method that uniformly mixes the space before combustion with the gas in the gas boiler. When this method is used, the oxygen required by the gas in the combustion process does not need to be obtained from the surrounding air, and only needs to reach the combustion zone with the air mixture to complete the instantaneous combustion end.

Users can choose different combustion methods according to practical requirements, and then promote sufficient combustion, the effect of gas boilers can also be fully utilized, and the energy consumption required for production can also be reduced.

The direct effect of improving the thermal efficiency of gas-fired steam boilers is to reduce the operating input cost of the boiler, so it is very important for users who use the boiler. Zhengzhou Fangkuai Boiler Factory summarized some methods that can effectively improve the thermal efficiency of gas-fired steam boilers, let's take a look.

1. Reduce the exhaust temperature
       At present, the high exhaust gas temperature of industrial boilers in my country is one of the main reasons for the low thermal efficiency of boilers. When the exhaust gas temperature of small boilers drops by 15-20 degrees Celsius, and for large boilers by 15 degrees Celsius, the thermal efficiency of natural gas boilers increases by 1%. Therefore, it is necessary to try to recover the waste heat of the flue gas to lower the exhaust gas temperature, reduce the exhaust heat loss q2, and save fuel.

2. Feed water softening treatment and condensate recovery
       Boiler feed water softening treatment and condensate recovery are also measures to improve boiler thermal efficiency. The raw water contains various impurities and their fouling substances. If the water quality is not well treated, the boiler will foul. The thermal conductivity of scale is very low, so once the heating surface is scaled, the output of the natural gas boiler will decrease due to the increase of thermal resistance, coal consumption will increase, and the thermal efficiency of the boiler will decrease.

3. Keep the boiler running under rated load
       When the natural gas boiler is overloaded, because the amount of fuel must be added, the coal seam must be thickened, the speed of the grate will increase, and the air supply must also be increased to meet the demand for load increase. The thickening of the coal seam and the acceleration of the grate speed will cause the incomplete combustion of the solids to lose their addition. Because of the addition of the air supply, the flue gas stays in the furnace for a short time. Some combustible gases are discharged with the flue gas before they are burnt. The heat loss of gas incomplete combustion increases.

At the same time, when the operation is overloaded, the temperature in the furnace increases due to the thickening of the coal seam, and the temperature of the exhaust gas increases accordingly, which increases the heat loss of the exhaust gas. When the boiler is operating at low load, the amount of coal burned is reduced, and the temperature in the furnace drops, which makes the combustion conditions worse, and the incomplete combustion loses q3 and q4. When the boiler load is only 50%, it is difficult to maintain stable combustion in the furnace because the temperature in the furnace drops significantly. The heat loss is relatively increased during low-load operation, so boiler overload or low-load operation will cause the thermal efficiency of the boiler to decrease.