Vacuum hot water boiler is a kind of hot water boiler with vacuum negative pressure inside. Most of them use gas fuel and oil fuel. Compared with ordinary hot water boiler, vacuum hot water boiler has higher operating efficiency and will be more efficient. Safe, basically no safety risks such as explosion.

The vacuum hot water boiler is already very safe, do I still need to conduct an annual inspection? Let Zhengzhou Fangkuai Boiler Factory answer for you.

According to the "Notice on Implementation of Safety Technical Supervision Regulations for Small and Atmospheric Hot Water Boilers" issued by the General Administration of Quality Supervision, Inspection and Quarantine in 2002, it is mentioned that the vacuum phase change boiler has a pressure lower than atmospheric pressure because of its medium circulation system. Therefore, there will be no explosion accident. Manufacturers should manufacture vacuum phase change boilers according to standards, and bear the legal responsibility of informing users (including boiler installers) of safe use and ensuring that the boiler system is always in a vacuum state during use. The installation unit of the vacuum phase change boiler shall be responsible for the quality of the installation meeting the installation requirements specified by the manufacturer.

After installation, the vacuum phase change boiler that meets the above requirements does not need to be confirmed by the boiler and pressure vessel safety supervision agency of the administrative department of quality and technical supervision, nor does it need to go through the registration procedures for use. Therefore, the vacuum boiler does not need to be confirmed by the administrative department of quality and technical supervision after installation, and there is no need to go through registration procedures.

For the normal operation of industrial boilers, a large amount of continuous water is indispensable. This water may be groundwater, river water, etc. If it flows directly into the boiler without pre-treatment, it will definitely cause considerable damage to the boiler in the long run. Zhengzhou Fangkuai Boiler Factory invites you to soften the boiler inlet water.

When softening the water, a water softening device should be used together. A portion of salt can be added. The concentration of the brine is generally 8% to 10%, or it can be saturated at all, depending on the usage of the boiler.

Although the boiler inlet water has been softened, it is inevitable that some dirt will be generated. At this time, the blowdown operation is required. Zhengzhou Fangkuai Boiler Plant has compiled the following procedures for the blowdown of industrial boilers for your study and reference.

1. Eliminate the excess salt and alkali in the boiler water, so that the boiler water quality indicators are always controlled within the scope of national standards.
       2. Eliminate the sludge formed in the boiler.
       3. Grease and foam on the water surface of the sewage boiler.

 

Only by ensuring good boiler water quality and slowing down or preventing scale formation can the safe operation of industrial boilers be ensured.

Industrial boilers are a type of special equipment. If you want to operate safely, you need assistance in many aspects, such as ensuring excellent quality when manufacturing boilers; paying attention to the installation of auxiliary equipment when transporting and installing boilers; and when using boilers. Pay attention to strictly follow the operating specifications, and so on. Here, Zhengzhou Fangkuai Boiler Factory would like to remind you that the "five major chain protection" of boilers cannot be ignored.

The "five major chain protections" of industrial boilers mainly refer to: high and low water level alarm devices, low water level interlock protection devices, overpressure alarm interlock protection devices, over temperature alarm interlock protection devices, etc.

For pulverized coal, oil and gas boilers, there are interlock protection devices that can automatically cut off the fuel supply when the induced draft fan is powered off, and the interlock protection devices that can automatically cut off the fuel or gas supply when the fuel and gas pressures are below the specified value. Ignition program control and flameout protection device, etc.

For hot water boilers, there are interlock protection devices that automatically cut off fuel supply and interlock protection devices that automatically cut off the supply and induced draft fans when the pressure drops to the vaporization pressure or the water temperature exceeds the specified value, or the circulating water pump suddenly stops running.

In the boiler market, according to the difference in capacity, boilers are divided into large, medium, and small, but there is no fixed and clear boundary between them. Therefore, when purchasing boilers, you can directly judge according to your own needs and choose what tonnage industrial boiler equipment to use. In industrial boilers, there are different components such as cylinders, headers, and steam drums. After understanding the functions of these components, the boiler can be operated better, and failures can be solved more quickly.

The sub-cylinder is an accessory of the boiler. It is placed in the boiler room for easy operation. It is used to distribute the steam from the boiler main pipe into several routes for easy adjustment. For example, the sub-cylinder is equipped with three-way branch pipes, one way to the production workshop, one way To the canteen, all the way to the bathroom, in the boiler room, you can conveniently operate the valves of each branch to control.

The header belongs to the pressure part of the boiler body. It is connected to the pressure parts such as the water wall tube and the convection tube in the boiler. The outer diameter is generally less than 325mm. It plays the role of collecting or distributing the circulating water in the boiler. Set the hand hole as an inspection hole, which cannot be accessed by people.

The steam drum or drum (the water heater is called the drum) is the most important pressure part of the boiler. Usually, the boiler is designed with 1 to 3 drums, which are arranged on the upper and lower sides. The upper drum is called the upper drum (the steam boiler is called the steam boiler). There are many accessories in the bag, such as the soda orifice plate, the water distribution pipe, and the top of the steam drum. There should be multiple pipe seats to connect the safety valve, pressure gauge, water outlet pipe, etc.), the lower drum and the upper There are boiler convection pipes between the boiler drums, the number is very large, so the diameter of the boiler drum is much larger than the diameter of the header, so many holes are drilled in the drum, and people can enter for maintenance. Some hot water boilers need to be inside the drum. Arrange several partitions and divide into several water chambers. The steam drum or drum is the most important pressure part of the boiler.

For industrial boilers, the energy efficiency index refers to the use of thermal efficiency index values equivalent to the CIBB2-2009 "Technical Conditions for Energy-saving Products for Industrial Boilers" (Industrial Boiler Branch of China Electrical Equipment Industry Association). To see whether all aspects of the performance of industrial boilers are intentional, just look at the data of energy efficiency indicators. It depends on the specific energy efficiency indicators, and let Zhengzhou Fangkuai Boiler Factory tell you the answer.

1. The slag combustible content index: calculate according to the analysis of representative coal types to determine the appropriate index value.

2. The temperature rise index of the outer surface of the furnace: use the outer surface temperature rise index of the furnace instead. The main assessment is the temperature difference between the outer surface of the furnace and the ambient temperature. It is more scientific and reasonable to use the temperature rise index to eliminate errors caused by changes in ambient temperature in winter and summer.

3. The exhaust gas temperature index of coal-fired boiler: It is consistent with the index of GB/T17954-2007 "Industrial Boiler Economic Operation".

4. Index of excess air coefficient at exhaust gas of coal-fired boiler: consistent with the index of GB/T17954-2007 "Economic Operation of Industrial Boilers".

There are many types of boilers on the market. The once-through boiler is one of the most frequently used boiler equipment, which means that the feed water is passed through the economizer, evaporating heating surface (water wall), superheater and all changes by the pressure of the feed water pump. It is a boiler for superheated steam. So, compared with other types of boilers, what are the advantages of once-through boilers? Let Zhengzhou Fangkuai Boiler Factory tell you the answer.

After the feed water enters the boiler, the heating, evaporation and superheating of water vapor are all carried out continuously in the heating surface, so there is no need to separate steam and water in the middle of heating. Therefore, it does not have a steam drum for a natural circulation boiler. There is no fixed dividing point between the heating surface of the economizer, the heating surface of the evaporator and the heating surface of the superheater, which changes with the boiler load. There is no steam drum (drum). The feed water is preheated and evaporated by the pressure of the feed water pump. When it comes to overheating, it is a power plant boiler that generates steam with rated parameters and capacity by passing through the heating surfaces at all levels at one time. The circulation rate of the evaporation zone is 1.

Since there is no obvious boundary between the evaporation and superheating heating surface of the once-through boiler, problems such as unstable flow and pulsation sometimes occur in the evaporation heating surface. It is necessary to install a throttle orifice at the inlet of the tube group, and between the inlet and outlet headers. Measures such as installing a breathing header to improve. In addition, film boiling (that is, the vapor bubbles generated on the heating surface are too late to separate and form a vapor film) phenomenon occurs on the evaporation heating surface, which is not conducive to heat conduction, resulting in overheating of the tube wall, which affects the safety of boiler operation. In this regard, spoilers or internally threaded pipes can be installed in the water wall in the high heat load area to delay the appearance of film boiling. Measures such as flue gas recirculation or adjustment of burner layout can also be used to reduce the maximum heat load in the furnace.

As the operating conditions demand higher and higher requirements for the peak regulation characteristics of the boiler, the adaptability of the once-through boiler to load changes has been paid more attention. The once-through boiler with spirally rising tube coil has the least sensitivity to the thermal deviation in the furnace, there is no two-phase fluid distribution problem between the tubes, and there is no need to install an orifice at the nozzle, so it has good low-load operation characteristics. However, the requirements for water quality and automatic adjustment are high, the resistance of the soda system is large, and the power consumption of the water pump is relatively large.

Electric boiler is a kind of boiler equipment that directly uses electric energy as fuel energy and realizes heating high-temperature hot water or outputting high-temperature steam through a series of chemical energy conversion. In recent years, as my country’s environmental protection policies have become more stringent, coal-fired and biomass-fired boilers have been gradually banned. Electric boilers have been favored by users due to their clean, environmentally friendly, and non-polluting characteristics. The frequency of use is also increasing year by year. . Many users are not very familiar with some problems when using electric boilers for the first time. Let Zhengzhou Fangkuai Boiler Factory tell you the answers.

If the electric boiler is under normal pressure, it does not belong to special equipment, while the large-scale electric boiler belongs to special equipment, which is based on the definition of "boiler". Boiler refers to equipment that uses various fuels, electricity or other energy sources to heat the contained liquid to certain parameters and outputs heat energy to the outside. It is specified as a pressurized steam boiler with a volume greater than or equal to 30L; the outlet water pressure is greater than Or equal to 0.1MPa (gauge pressure), and the rated power is greater than or equal to 0.1MW pressurized hot water boiler; organic heat carrier boiler.

For the electric boilers used in food factories, wood factories, paper mills and other industries, most of them are electric steam boilers. In other words, the function of these boilers is to use electric energy to generate high-temperature steam by converting energy, and then deliver the steam to various production workshops to achieve various technological purposes such as cooking and drying. For example, in a paper mill, steam enters the steaming ball to cook the paper-making raw materials, and steam enters the dryer to dry the wet paper passing through the dryer. And the food factory can use steam to steam the food, and can also use the steam to dry the food indirectly, or use the steam to sterilize some food indirectly or directly, etc. The wood mill uses steam to heat the wood, or indirectly heats the drying room for further training and drying.

Gas-fired steam boilers are special equipment. Regardless of whether they are manufactured, produced or used, they are subject to the control of relevant departments, and a series of certificates are required before the boiler is used. Zhengzhou Fangkuai Boiler Factory summarized some documents that need to be processed for 1 ton gas-fired steam boilers.

Before the installation of a one-ton gas-fired steam boiler, the installation unit shall inform the local special equipment safety supervision department, and the installation supervision and inspection shall be carried out by the local special equipment supervision and inspection agency, and an inspection report shall be issued.

And bring boiler-related technical documents and boiler installation quality certificate and boiler installation supervision and inspection report to the local special equipment safety supervision agency to apply for the special equipment use registration certificate.
       1. The furnace worker must hold a special equipment operator certificate and work item: boiler operation.
       2. The water treatment personnel must hold a special equipment operator certificate, and the work item: boiler water quality treatment.
       3. The management personnel must hold the special equipment management personnel certificate, and the work item: the safety management of the boiler, pressure vessel and pressure pipeline.

In addition, a 1-ton gas-fired steam boiler must undergo an external inspection every year, an internal inspection every 2 years, and a hydraulic test every 6 years.

Atmospheric boilers and pressure-bearing boilers, as the name implies, atmospheric boilers refer to boiler equipment with a normal pressure inside, while pressure-bearing boilers are boiler equipment with a certain pressure inside. According to different pressures, they are divided into overpressure. , High-pressure, medium-pressure, and low-pressure boilers, the applicable industry groups are also different.

For users who are new to boilers, how to quickly distinguish whether it is an atmospheric boiler or a pressure boiler through the boiler nameplate? Let Zhengzhou Fangkuai Boiler Factory tell you the answer.

First of all, we need to know all the parameters on the boiler nameplate. If the boiler nameplate has a rated steam pressure, even if it is 0.1MPA, it is a pressure-bearing boiler. Generally speaking, steam boilers are pressure boilers, and most of hot water boilers are atmospheric pressure boilers.

The steam boiler nameplate is generally marked with the model number. Take the WNS2-1.25-Q boiler as an example. WNS refers to the classification of the boiler, that is, the horizontal internal combustion chamber fired boiler. 2 refers to the rated steam volume of two tons, 1.25 It means that the rated steam pressure is 1.25Mpa, which is generally referred to as a pressure of 13 kg. The following Q refers to the type of boiler fuel, and Q refers to the gas furnace.

The 3-ton hot water boiler is commonly used in the heating and heating field. The boiler directly outputs high-temperature hot water and provides air-conditioning, radiator and other channels to send warmth to thousands of households. Combining with the current strict environmental protection policies in our country, coal-fired and biomass-burning boiler equipment that pollutes the environment have been gradually banned and replaced by more energy-efficient and environmentally-friendly boiler equipment such as gas, oil, and electricity. When purchasing hot water boilers, many users are very concerned about how much heating demand the boiler can meet. Zhengzhou Fangkuai Boiler Factory takes a 3-ton gas-fired hot water boiler as an example to briefly explain the heating area of ​​the boiler.

First, we analyze the parameters of the 3-ton gas-fired hot water boiler. A 3-ton gas-fired hot water boiler is equivalent to 2.1 megawatts, or 2,100 kilowatts, or 2,100,000 watts.

If a 3-ton gas-fired hot water boiler is used to heat the plant, it can provide an area of ​​more than 20,000 square meters. Of course, the specific heating area that can be met depends on the actual situation of the plant, such as how high the height is and whether it has heat preservation treatment. , Construction years, etc.

The operating efficiency of the 3-ton gas-fired hot water boiler launched by the Zhengzhou Fangkuai boiler manufacturer is above 98%, and the inside of the boiler has been fully insulated, which can fully meet the heating area of ​​30,000 square meters, which is comparable to ordinary gas-fired hot water on the market. Compared with the boiler, the cost performance is greatly improved, so it is also loved and used by more and more users.

Atmospheric hot water boiler is a type of hot water boiler, mainly used in winter heating, hot water supply and other fields. Due to the high safety performance of the boiler, it is trusted and used by the majority of users. Although the safety performance of atmospheric hot water boilers is very high, there are strict standard requirements in terms of design, manufacturing, inspection, acceptance and delivery technical documents, which should meet JB/T7985-2002 "Small Boilers and Atmospheric Heating Technical Conditions for Water Boilers", according to the requirements of JB/T7985-2002 "Technical Conditions for Small Boilers and Atmospheric Hot Water Boilers" [New Standard].

Recently, Zhengzhou Fangkuai Boiler Factory found that many users who use atmospheric hot water boilers do not care much about the installation and use of boiler air pipes. In fact, this is a very dangerous behavior, and improper operation can easily cause boiler damage.

According to the provisions of Article 6.2.9 in the “Conditions” mentioned above, the equivalent diameter Dd of the atmospheric pipe connecting pipe of the atmospheric hot water boiler should be calculated as follows: Dd=88×√(Q), where Dd——atmosphere The equivalent diameter of the connecting pipe, in millimeters (mm); Q——The rated thermal power of the atmospheric hot water boiler, in megawatts (MW). The calculated Dd value is rounded according to the diameter of the pipe specification and can only be increased, not reduced.

According to the provisions of Article 6.3.5 of JB/7985-95 [Old Standard], the pipe diameter should be calculated according to the following formula: Dd=20+88×√(Q), where Dd——the equivalent diameter of the atmospheric connecting pipe, unit It is millimeter (mm); Q——The rated thermal power of atmospheric hot water boiler, the unit is megawatt (MW). The calculated Dd value is rounded according to the diameter of the pipe specification and can only be increased, not reduced.

According to the difference in output medium, gas boilers are divided into gas steam boilers and gas hot water boilers. A 4-ton boiler refers to boiler equipment that outputs 4 tons of steam or 4 tons of high-temperature hot water per hour. This is a brief introduction for you. Explanation of boiler model parameters. For users who need to purchase boilers, what are the parameters and prices of 4-ton gas boilers are questions worthy of attention, let Zhengzhou Fangkuai Boiler Factory answer for you.

First of all, according to the difference of the output medium, Zhengzhou Fangkuai Boiler Factory will separately describe the parameters of the steam boiler and the hot water boiler.

Parameters of 4 ton gas boiler (steam):
       The total electric power of burning heavy oil is 26.2KW of three-phase electricity;
       The total electric power of burning light oil is 13.0KW of three-phase electricity;
       The total gas electric power of three-phase electricity is 13.0KW;

Parameters of 4 ton gas boiler (hot water):
       The total electric power of burning heavy oil is 22.2KW of three-phase electricity;
       The total electric power of burning light oil is 9KW of three-phase electricity;
       The total gas electric power of three-phase electricity is 6.5KW;

Recently, some users are consulting Zhengzhou Fangkuai Boiler Plant about the selling price of steam boilers. The user needs to purchase steam boilers for processing and production in food plants. For this reason, the technical engineer of Zhengzhou Fangkuai Boiler Factory recommended a 4-ton gas-fired steam boiler for the user after understanding the user’s needs in detail and visiting the user’s site for on-site inspection. The current price of the equipment is between RMB 250,000 and RMB 350,000. Wait.