When and under what conditions, the hydraulic pressure test, the main steps of the water pressure test, there are many techniques and techniques.

With many years of boiler experience, FANGKUAI Boiler has summarized the following dry goods for your reading and reference.

First, When do you need to carry out boiler water pressure test?
       1. When the newly installed boiler is put into operation.
       2. When the boiler that has been out of service for more than one year is restored to operation.
       3. After the boiler is rebuilt and the pressure components are repaired or replaced, if the number of water wall replacement tubes is more than 50%, the superheater, reheater, economizer and other components are replaced in groups, and the steam drum is undergoing major repairs. Time.
       4. When the boiler is overpressured to 1.25 times working pressure and above.
       5. When the boiler is seriously deficient in water and the heating surface is deformed in a large area.
       6. According to the operation situation, there is doubt about the safety and reliability of equipment operation.

Second, the boiler water pressure test method
       1. The water pressure test should be carried out when the ambient temperature is higher than 5 °C. When it is lower than 5 °C, anti-freezing measures must be taken.
       2. The water used for the hydraulic test should be kept above the ambient dew point to prevent condensation on the surface of the boiler. It may be confused with the inconsistency of water seepage and increase the inspection difficulty. However, it is not suitable for the temperature to be too high to prevent vaporization. (It is difficult to find the leak) and excessive temperature difference stress, generally 20 ° C ~ 70 ° C.
       3. After the water is full, gradually increase the pressure to 0.4MPa, that is, perform a strict inspection. If necessary, tighten the bolts of the flange, manhole door and hand hole cover.
       4. During the water pressure test, the water pressure should be slowly raised and lowered. When the water pressure rises to the working pressure, the pressure should be suspended, check for water leakage or abnormality, and then boost to the test pressure for 20 minutes. There is no drop, that is, it is reduced to the working pressure for inspection.
       5. Any leaks should be recorded to reduce the pressure to atmospheric pressure.

The above is the skill that FANGKUAI Boiler needs to master when comparing the more comprehensive boiler water pressure test. I hope it can help you.

The application of pressureless boilers is very extensive, and it has the advantages of safety and low explosion risk compared with pressurized boilers.

This is because the top of the pressureless boiler is directly connected to the atmosphere and does not withstand the static pressure of the water column of the heating system. It can also be understood as an "open hot water tank".

There are three distinct advantages of a pressureless boiler, mainly:

       1. the operation is absolutely safe and reliable. The biggest advantage of a pressureless boiler is that it is not subjected to pressure during operation and there is no risk of explosion.
       2. Save steel and simplify the process. The pressureless boiler has low material requirements. Except for the furnace, the other uses cheaper ordinary carbon steel materials. The welding process can meet the strength requirements by using fillet welds, which not only saves welding materials, but also simplifies the process.
       3. It is well known that the main scale of boilers is sulfate and silicate. These two types of scales decrease with the evaporation of water and reach a certain level (saturated concentration). The water temperature of the pressureless boiler is kept at around 95 °C for many years, which is not limited by the saturation temperature, and the scale is not easy to form. Therefore, the pressureless boiler also has the advantage of being less prone to fouling, thereby eliminating unnecessary water treatment devices.

 

But this is not to say that the pressureless boiler has no special attention when it is running. On the contrary, the pressureless boiler should pay attention to many details when it is running.
       1. the system water
       The heating system should be equipped with a high-level bearing box, which is located at the high point of the system. The rainwater system is connected to the return pipe and is filled into the system through the tap water pressure. At the same time, the system discharge is normal, so that the system can replenish water. After the high water tank overflows, the water pump cycle is started. Replenish water until the system is full.
       2. Check the activation valve before running
       Firstly, the valve of the boiler inlet and outlet is opened, and the circulating water pump is turned on to make the system circulate and flow to check whether the automatic opening and closing valve is sensitive. Then the circulating water pump stops running for 1-2 hours, paying attention to the water level of the boiler.
       If the water level changes little here, the automatic opening and closing valve of the table name is closed tightly. If the boiler water level rises rapidly after stopping the pump, it indicates that the automatic opening and closing valve leaks seriously and needs to be repaired or replaced in time.
       When the automatic opening and closing valve fails or the leakage is serious, it cannot be ignited.
       3. stop the furnace
       When the pressureless boiler is shut down, the operation of the combustion equipment is the same as that of the pressure-bearing boiler, but it is not limited by the requirement that the boiler water temperature is below 50 °C. If a serious water hammer is caused by vaporization during the shutdown, the boiler water supply can be used to replenish water, and the overflow pipe can be used to reduce the furnace temperature and weaken the vaporization phenomenon.

The thermal efficiency is directly linked to the operating cost of the gas steam boiler. It is very important to understand the factors affecting the thermal efficiency of the boiler and to master the method of improving the thermal efficiency of the boiler.

Factors affecting boiler thermal efficiency:
       First, the exhaust temperature of the furnace body. The higher the exhaust gas temperature, the lower the thermal efficiency; and vice versa.
       Second, whether the fuel is completely burned. If the fuel cannot be completely burned, the boiler's thermal efficiency is also very low.
       Third, the heat dissipation strength of the furnace wall. The stronger the heat dissipation of the boiler wall, the lower the thermal efficiency; and vice versa.
       Fourth, the amount of scale in the furnace. The more scale, the worse the heat of the furnace and the lower the thermal efficiency.

Measures to improve boiler thermal efficiency:
       First, reduce the heat loss of smoke exhaust
       The temperature of the smoke is a comprehensive parameter for the design, operation and health of the boiler, and is the main reason affecting the thermal efficiency of the boiler. The exhaust gas temperature of ordinary gas boilers is around 220 °C. After calculation, the thermal efficiency will decrease by 1% for every 10 °C increase in smoke temperature.
       FANGKUAI Boiler invested a lot of energy and money to reduce the heat loss of smoke exhaust. The boiler adopts advanced condensing technology to make full use of the residual heat of flue gas. The exhaust gas temperature can be reduced to about 50 °C, and the thermal efficiency is also increased to more than 107%.
       Second, reduce fuel incomplete combustion heat loss
       Sometimes, due to the poor heat of the furnace or the use of poor quality burners, the fuel cannot be fully burned, which reduces the thermal efficiency and requires a large amount of gas cost.
       In solving this problem, the full premixed combustion technology is used, and the natural gas and air are accurately adjusted before entering the burner to achieve an ideal state, so that the fuel is burned sufficiently and uniformly, and there is no need to worry about heat loss.
       Third, the furnace wall heat dissipation
       The problem of heat loss is unavoidable when the boiler is running. This is the physics conclusion.
       We set up double-layer closed structure in the front and rear smoke boxes, more than 95% of the welding uses intelligent automatic machinery, and each layer is filled with multi-layer centrifugal glass wool for thermal insulation treatment, without ignoring every detail, to a great extent, reducing Loss of heat.
       Fourth, the amount of scale in the furnace
       Boiler feed water contains various impurities and calcium and magnesium ions, which will form scale when operated for a long time. The thermal conductivity of the scale is very low. When the surface is fouled by the heating surface, the thermal resistance increases, the exhaust temperature of the boiler rises, and the heat loss of the exhaust gas increases. In general, 1 mm of scale on the heated surface will increase the heat loss of the exhaust by 2%-4%.
       We use high-quality soft water treatment equipment, operate the boiler feed water softening treatment device in strict accordance with the process, control the boiler feed water quality, and use the patented technology--scale online monitoring, real-time control of scale status, and regularly remind users to the boiler as a whole. Check and clean.

The above is the four methods provided by FANGKUAI Boiler to improve the thermal efficiency of gas-fired boilers. You can check the boilers by referring to the above methods. If you have any problems with your boiler, please contact us immediately and our technical engineers will provide you with a solution for free.

Both coal-fired boilers and gas-fired boilers are relatively common types in the boiler market in recent years. Although they are more consistent in their comprehensive performance, they have specific combustion methods, combustion products, and specific operational requirements and workflows. A big difference, after ample market research, Fangfeng Boiler summed up the main characteristics of coal-fired boilers and gas-fired boilers.

First, the way of burning.

Most of the coal-fired boilers use the layer-fired combustion method. The coal passes through the coal-feeding machine to transport the chain grate plane, and the combustion process is completed in the furnace. Most of the gas boilers use chamber combustion, and the natural gas is mixed with the air in the burner in a predetermined ratio, and then injected into the furnace through the nozzle to complete the combustion in the furnace state.

Second, the automatic control of the boiler.

Coal-fired boilers are limited by factors such as coal type, coal seam thickness, blast volume, air volume, air volume distribution and grate speed. It is difficult to automatically adjust boiler operating parameters according to load. However, high-quality gas boilers are less affected, and only the size of the burner can be adjusted according to the load, and automatic control is easy.

Third, the combustion products.

Coal is mainly composed of C, H, O, N and other elements, ash and moisture, but not the surface of these components, but a more complex compound. After the coal is burned, heat is released, and sulfurized oxygen gas is generated, which is discharged into the atmosphere by the flue gas. These gases are very polluting the environment and cause harm to humans. The natural gas used in gas boilers is mainly composed of methane gas and contains a small amount of non-hydrocarbon gas. Generally, it does not contain water and ash. Therefore, it mainly produces carbon dioxide and water after combustion, and releases a large amount of heat. Compared with coal, Hazardous substances should be significantly reduced.

The above is the difference between the understanding of the characteristics of coal-fired boilers and durable gas-fired boilers. We can understand that coal-fired boilers and gas-fired boilers are used in many specific ways and work contents due to different fuels. There are many differences, so in the process of choosing the two, we must choose according to the needs and convenience of operation.

With the release of various coal-fired boilers banned policies, all provinces and cities across the country have begun to carry out clean emission conversion projects for boilers. Natural gas boilers stand out among many boiler types with their unique clean and environmental advantages, and are favored by users in many industries such as food, chemical, medical, heating, construction, hotel, and paper. After purchasing a natural gas boiler, how to properly install the boiler is a worry for many users, because once the boiler is mistaken during the installation process, it will cause various unintended consequences.

Preparations for the installation of natural gas boilers are indispensable and must be carefully prepared before installation. So, what are the preparations for the installation of natural gas boilers?

First, determine the installation location of the boiler in advance.

The choice of boiler installation location should be taken to avoid these locations: poor ventilation, near flammable and explosive materials. Only when installed in a place with good ventilation and away from inflammable and explosive materials, can the boiler installation ensure peace of mind.

Second, the various installation procedures are completed in advance, and communicate with the management department.

According to the relevant regulations of the steam boiler safety supervision regulations, the unit using the boiler should be required to go through the registration procedures for the installation of natural gas boilers in accordance with the procedures before installation. The boiler user needs to communicate with the local boiler supervisory agency before installation and assign a professional to be responsible for the supervision of the installation work.

Third, contact the boiler installation related installation technicians in advance.

Installation of a natural gas boiler to install such a technical activity must be done in advance by contacting a professional and trustworthy boiler installer. And the installer must carefully understand the steps of installing the natural gas boiler and related precautions before installation. Therefore, contact the installation technicians of the boiler installation in advance before installation. Users should not start the operation by themselves.

If a worker wants to do something good, he must first sharpen his tools. The installation of natural gas boilers is also the same. Before the installation, people must pay special attention to the preparations in advance, and perfect preparation work can better complete the boiler installation work quickly and effectively. The use after installation is also more secure, and if there are any problems, you can find relevant personnel to repair in time.

If the boiler is used in some bathing places, when the boiler is short of water, it will enter the water urgently, and the water will evaporate instantaneously, and the boiler will expand vigorously in a short time. If it really explodes, it may be caught by bricks and other things 20 meters away, and the damage radius is about 10 meters.

If a large industrial boiler explodes, and the boiler room is collapsed, the factory area will also have a certain extent of damage, which is an extremely serious disaster.

Nowadays, boiler explosion accidents have been rare. The more serious the boiler safety measures are, the more stringent the safety valves and fire protection devices will be. Generally, there are relatively many small boiler accidents. This is mainly because the boiler manufacturing qualification of some manufacturers of small boilers is not high, and the larger manufacturers or manufacturers with A-class boiler production qualifications are responsible for the safety of boilers. Very strict, they will strictly comply with the relevant national regulations to produce boilers that meet the standards.

The use unit of the boiler should also reasonably select the location of the boiler room in accordance with relevant regulations, so as to avoid important facilities and residential areas, prevent problems before they occur, and regularly check the operation of the boiler to check for potential safety hazards in a timely manner.

People's domestic water and heating are inseparable from gas-fired hot water boilers, and due to the special nature of their performance, they must comply with strict safety practices. So, how do you need to ensure the safety of gas-fired hot water boilers?

1. Before the work, carefully check whether the water supply, drainage, gas supply pipe accessories, safety valve, pressure gauge and water level gauge of the gas hot water boiler are sensitive, and the safety can be confirmed before the work can be carried out.

2. When you are in the water, you should use both hands to operate. First open the water gate with one hand, then open the water valve of the water injector with the other hand, and the water naturally flows into the furnace. When stopping, the valve should be closed first, then the water door should be closed. When the valve is opened and closed, the face must be avoided to avoid the accident caused by the soda.

3. During the operation of the gas hot water boiler, it is necessary to pay attention to check the various parts and observe whether the pressure and water level are within the normal range. The furnace workers are not allowed to leave the post without permission. When working in night shifts, avoid sleeping and not allowing sleep, so as to avoid accidents. When the boiler is discharged, each shift must be carried out once. The water level should be properly adjusted before the discharge, which is slightly higher than the normal water level by 2/3, and then discharged.

4. The water level gauge must be flushed once per shift. When flushing, follow the prescribed procedure, first close the water valve, open the drain valve, flush the steam valve, then pay attention to whether the steam is blocked; then close the steam valve, then pay attention to whether the water is blocked. When flushing the water valve, there is water and steam, and the time is a little longer to ensure that the fake water level is not available. Hot gas water boiler fuel must be inspected for safety to prevent the presence of explosive substances in the fuel to prevent explosion hazard.

5. Always check the temperature of the mechanical equipment and the motor casing. If the machine is faulty or the motor heat exceeds 60 degrees, stop the test immediately. When the gas hot water boiler is in normal operation, the steam pressure shall not exceed the specified working pressure, and the safety valve shall be inspected once a week on average.

The thermal efficiency is directly linked to the operating cost of the gas steam boiler. It is very important to understand the factors affecting the thermal efficiency of the boiler and to master the method of improving the thermal efficiency of the boiler.

Factors affecting boiler thermal efficiency:

First, the exhaust temperature of the furnace body. The higher the exhaust gas temperature, the lower the thermal efficiency; and vice versa.

Second, whether the fuel is completely burned. If the fuel cannot be completely burned, the boiler's thermal efficiency is also very low.

Third, the heat dissipation strength of the furnace wall. The stronger the heat dissipation of the boiler wall, the lower the thermal efficiency; and vice versa.

Fourth, the amount of scale in the furnace. The more scale, the worse the heat of the furnace and the lower the thermal efficiency.

Measures to improve boiler thermal efficiency:

First, reduce the heat loss of smoke exhaust

The temperature of the smoke is a comprehensive parameter for the design, operation and health of the boiler, and is the main reason affecting the thermal efficiency of the boiler. The exhaust gas temperature of ordinary gas boilers is around 220 °C. After calculation, the thermal efficiency will decrease by 1% for every 10 °C increase in smoke temperature.

FANGKUAI Boiler invested a lot of energy and money to reduce the heat loss of smoke exhaust. The boiler adopts advanced condensing technology to make full use of the residual heat of flue gas. The exhaust gas temperature can be reduced to about 50 °C, and the thermal efficiency is also increased to more than 107%.

Second, reduce fuel incomplete combustion heat loss

Sometimes, due to the poor heat of the furnace or the use of poor quality burners, the fuel cannot be fully burned, which reduces the thermal efficiency and requires a large amount of gas cost.

In solving this problem, FANGKUAI Boiler uses full premixed combustion technology. The natural gas and air are precisely adjusted before entering the burner to achieve the ideal state, so the fuel combustion is sufficient and uniform, and there is no need to worry about heat loss.

Third, the furnace wall heat dissipation

The problem of heat loss is unavoidable when the boiler is running. This is the physics conclusion.

We set up double-layer closed structure in the front and rear smoke boxes, more than 95% of the welding uses intelligent automatic machinery, and each layer is filled with multi-layer centrifugal glass wool for thermal insulation treatment, without ignoring every detail, to a great extent, reducing Loss of heat.

Fourth, the amount of scale in the furnace

Boiler feed water contains various impurities and calcium and magnesium ions, which will form scale when operated for a long time. The thermal conductivity of the scale is very low. When the surface is fouled by the heating surface, the thermal resistance increases, the exhaust temperature of the boiler rises, and the heat loss of the exhaust gas increases. In general, 1 mm of scale on the heated surface will increase the heat loss of the exhaust by 2%-4%.

We use high-quality soft water treatment equipment, operate the boiler feed water softening treatment device in strict accordance with the process, control the boiler feed water quality, and use the patented technology--scale online monitoring, real-time control of scale status, and regularly remind users to the boiler as a whole. Check and clean.

The above is the four methods provided by Fangfeng Boiler to improve the thermal efficiency of gas-fired boilers. You can check the boilers by referring to the above methods. If you have any problems with your boiler, please contact us immediately and our technical engineers will provide you with a solution for free.

How does gas-fired boiler combine energy-saving, environmental protection and intelligence? FANGKUAI Boiler has invested considerable capital and energy, and has diligently researched and introduced a boiler unit that meets the above conditions—gas module boiler.

Gas-fired boiler means that multiple gas-fired boilers are set by the joint control system, according to the dynamic parameters such as the set heating temperature curve, and with reference to the indoor and outdoor temperature difference changes or their own demand changes, intelligently carry out the boilers that automatically judge the departure and shutdown. The number of running units can achieve near-unattended work mode and avoid waste of resources.

Concentrated office buildings When it comes to choosing thermal equipment that provides hot water and heating, gas-fired boilers are no better.

FANGKUAI Boiler has summarized several purchase criteria for gas-fired boilers, so that you can understand this type of boiler more comprehensively and make reasonable judgments based on your own needs.

First, the operating costs.
       The “module” is equivalent to splitting a single large boiler into several small boilers. The “simple parallel combination” of the quantity can realize the demand of different steaming tons. The modular design structure determines the three characteristics of the boiler.
       1. Each boiler is spared for each other. Once a single boiler has a sudden failure, other boilers can be started immediately, and the impact on heating is very small.
       2, capacity expansion is good, many office buildings in different seasons, the demand for heating and other domestic heat load will change, the choice of module boiler can solve this situation perfectly, by increasing or decreasing the number of boilers at any time, to achieve a smaller investment Meet the needs.
       3. The requirements for the infrastructure of the boiler house are not high, which can greatly reduce the capital construction investment costs.

Second, whether low nitrogen emissions.
       Many office buildings are located in the central area of ​​the city. With the stricter air pollution emission standards in China, many cities have imposed coal-free or ultra-low-nitrogen emission requirements. The gas-fired boilers produced by Fangkuo can use nitrogen-emitting emissions of as low as 18 mg/m3 by using patented technology, which meets the boiler emission standards in all regions of China.

Third, the safety index.
       The centralized office building is generally densely staffed. Once a sudden disaster occurs, the consequences are unimaginable.
       FANGKUAI boiler can be equipped with intelligent remote monitoring cloud service system for each boiler. The professional supervisors observe the operation of the fast boiler in China within the whole day. Once an emergency situation is discovered, the early warning device is remotely activated and the user is notified online. Kill the danger in the cradle.

The above is what you need to pay attention to when selecting the gas module boiler for the office building provided by Fangfeng Boiler. I hope that you can better choose the boiler suitable for your enterprise. If you have any other questions about the boiler, you can call our technical engineer's hotline directly and we will do our best to help you.

In addition to the quality of the electric boiler and the quality of the after-sales service, the electric boiler should also pay attention to some operating specifications when using it, so as to avoid the harm to the person and property more effectively.

If the electric boiler is used for a long time, it will age. How to maintain the electric boiler? Fang Boiler professional boiler technical engineer, to take you to understand the maintenance of electric boilers. Generally, electric boilers must be repaired and maintained to a certain extent within 1-2 years. This will help the normal operation of electric boilers. Regular maintenance is also the basic condition for ensuring normal operation of electric boilers.

1. When maintaining and maintaining the boiler, you must pay attention to: cut off the power supply and relieve pressure.

2. The burner should be removed from the boiler body every two months on average, and the foreign matter such as carbon deposits and dust should be carefully removed. The photocell is wiped once a month on average, and the fuel filter should always be clean and well filtered. Carefully clean the filter inside the pump. Be careful not to damage the gasket. The burner must not be idling without oil to avoid damage to the pump.

3. The water level gauge should be kept clean at all times, and the cleaning valve should be opened once a day to ensure the water level is clear.

4. The safety valve is pulled once a day to prevent rust failure.

5. After the maintenance work is completed, check whether the tools, materials and accessories are complete, and prevent these accessories from remaining in the space such as the furnace.

6. Dedicated personnel will be removed from the work site after passing the inspection; then the maintenance records will be made for later enquiry work.

The correct water circulation protection measures of the gas hot water boiler can effectively prevent the water vaporization and water hammer and other bad phenomena from occurring after the water circulation pump suddenly stops. Based on years of industry experience, FANGKUAI Boiler will summarize the protection measures for the water circulation of gas hot water boilers for your reference.
       1. Between the inlet and outlet pipes of the circulating water pump, set the bypass pipe of the check valve, the pipe diameter should be close to the mother pipe, and the cross-sectional area of ​​the bypass pipe should not be less than 1/2 of the cross-sectional area of ​​the parent pipe; check valve The direction of the water flow should be consistent with the direction of the water flow of the pump.
       2. A heavy hammer type micro-opening safety valve is arranged on the inlet pipe section of the circulating water pump, and the overpressure drain pipe can be connected to the open water supply tank or the drainage ditch.

The design of circulating water system in gas hot water boiler room should also meet the following requirements:
       1. Each boiler outlet pipe shall be equipped with a shut-off valve or gate valve. The boiler inlet and supply pipes shall be provided with a shut-off valve and a check valve.
       2. When the hot water boilers are operated in parallel, a regulating valve shall be installed on the inlet pipe of each boiler so that the deviation of the outlet water temperature of the parallel boiler does not exceed 10 °C.
       3. The gas collecting and exhausting devices shall be installed at the high point of the boiler outlet pipe and the gas gathering place. The size of the exhaust valve shall not be less than DN20.
       4. The lower part of the system and the low recess should be provided with a drain pipe and a drain valve.
       5. The decontamination device should be installed at the position where the hot water system return water main pipe is convenient for cleaning. There should be a pressure gauge and a closing valve before and after the decontamination device, and there are bypass pipes 1 to 2 smaller than the main pipe.
       6. There should be multiple water heaters and water collectors in the boiler room for hotspots. The water separators and water collectors should be equipped with drain valves, thermometers, pressure gauges, etc.

In recent years, more and more users have begun to use electric heating boiler equipment. On the surface, people are beginning to realize the importance of environmental protection and energy conservation. The electric boiler produced by FANGKUAI Boiler is clean and environmentally friendly, pollution-free, noise-free and fully automatic because it has no combustion chamber and chimney. It is widely loved by users.

The various components of the electric steam boiler are made of different materials.
       1. In order to prevent electrochemical corrosion, cathodic protection measures must be taken.
       2. For the sewage treatment of the electric boiler, the sewage at the bottom of the boiler can prevent the condensation of the smoke. Flue gas condensation is caused by moisture in the flue gas (diesel or natural gas) and the temperature of the flue gas is too low. Some of this moisture is removed from the chimney, some is absorbed by the chimney wall, and the rest is deposited at the bottom of the chimney.
       The amount of water produced is affected by the following factors: the flue gas temperature (to achieve 91% thermal efficiency, the flue gas temperature needs to reach 170 °C), the total surface area of ​​the chimney, the material of the chimney and the insulation of the chimney. Burner repair. Maintenance of electric steam boilers and burners, after steam supply for maintenance. Because the products of combustion corrode the boiler and clean up the carbon deposits, the combustion products must not be left in the boiler for too long.
       3. The necessary content for electric boiler cleaning.
       When using the electric boiler, first open the burner door, remove the rear outer casing panel, unscrew the screw on the cleaning side of the electric boiler, clean the gas pipe with a wire brush, and clean the combustion chamber with a soft brush.
       The electric boiler removes the residue from the boiler, screws the cleaning port, closes the burner door, and checks whether the seal is complete.
       4. If the electric boiler is installed in an area where the temperature is below 0 °C, the following protective measures must be taken. If the electric boiler room is outdoors, the indoor temperature is lowered to 15 ° C or 18 ° C, so that the electric boiler runs all day. If there is no one in the room for a long time, the water in the electric boiler should be drained and the boiler should be stopped.