When the business staff of Zhengzhou Fangkuai Boiler Factory show users our successful cases or lead users to visit the factory, many users who want to purchase steam boilers will ask: What does "steamed tons" mean? Does it represent the tonnage of the boiler? This involves the professional problem of steam boilers, and our technical expert Xie Gong will answer for everyone.

In the field of thermodynamics, the steam ton itself is a non-standard unit, which represents a unit of the capacity of the heating boiler. The steam ton/hour means that 1 ton of hydration can be evaporated per hour to provide heat for water vapor for heating or for machine operation.

One steamed ton of medium is equivalent to containing 0.725MW of heat. In East China and North China, the heating area of ​​one steamed ton of medium is about 10,000 square meters.

The tonnage of a boiler has two meanings: one is to measure the rated output or work capacity of the boiler. The steam boiler has an hourly evaporation capacity t/h, and the hot water boiler has an hourly heating capacity, 0.7Mw=1t. Another meaning is to measure the total production capacity of the boiler plant. For example, the annual output of a certain boiler plant is XX tons. It is not measured by the number of boilers, but is the sum of the rated evaporation or heat supply of all boilers produced. The sum is expressed as the total amount.

The 8-ton gas hot water boiler contributes a lot to the heat output of heating during the heating season. Many users who use gas hot water boilers are more concerned about whether the boiler will fail during operation. After all, During the heating season, the boiler is basically needed every day. If the boiler stops running due to a malfunction, the loss will be very serious.

Song Gong, the boiler technical engineer of Zhengzhou Fangkuai Boiler Factory, reminded everyone that the following issues should be paid attention to during the heating operation of the 8-ton gas-fired hot water boiler.

The 8-ton gas-fired hot water boiler is prone to steam and moisture layer in the following situations. The vapor-water layer is easy to occur in the horizontal or small inclination tube and the flow rate of the steam-water mixture in the tube is too low. This is due to the different density of steam and water. If the flow rate of the soda-water mixture is too low, the Taodong mixing effect is less than the separation effect, and a steam-water layer is produced. Therefore, the water wall of the 8-ton gas-fired hot water boiler using natural circulation mode should avoid horizontal and small inclination arrangements.

The use of large direct downcomers for the 8-ton gas-fired hot water boiler can reduce the flow resistance and facilitate water circulation. In addition, it simplifies the layout, saves steel, and reduces the number of openings in the steam drum.

The 10-ton gas-fired steam boiler belongs to the category of medium-sized industrial boilers. The boiler can output 10 tons of high-temperature steam per hour, which can meet the steam requirements of chemical plants, food processing plants, pharmaceutical plants and other industries. For boiler users, the market price of gas-fired steam boilers is a concern for them. Through the comparison of market prices, we can understand the market sales of this type of boiler, and it is also convenient to compare the differences between different boiler plants.

Zhao Gong, the boiler pre-sales consultant of Zhengzhou Fangkuai Boiler Company, learned about the latest situation of the market price of 10 tons of gas-fired steam boilers, and explained to all users, and it is also convenient for users to grasp the situation.

The pressure of a 10-ton gas-fired steam boiler is generally between 1.25-1.6MPa, which is a medium-pressure boiler. The market price of the boiler is affected by the model, operating efficiency, energy saving, and pollutant emission.

The more common model of 10-ton gas-fired steam boiler is the WNS horizontal boiler. This design of the boiler is more conducive to the user's control of the boiler; and under the same tonnage, the horizontal structure of the boiler is smaller and saves the boiler room. Operating efficiency is an important parameter to measure whether the boiler is energy-saving. The higher the operating efficiency, the more energy-saving the gas-fired steam boiler. The operating efficiency of gas-fired steam boilers on the market is generally around 80%, while the boilers launched by Zhengzhou Fangkuai Boiler Factory incorporate many advanced technologies such as condensation recovery, and the operating efficiency can reach more than 95%, which is more than 15% higher than conventional boilers. The energy saving effect can be said to be very obvious.

Moreover, the boiler adopts full premix, FGR and other combustion technologies and is equipped with ultra-low nitrogen burners, and the pollutant emissions after operation can be completely lower than 30 mg/m3, meeting China's strict atmospheric environmental protection standards. It can be used normally in any area.

In general, the market price of a 10-ton gas-fired steam boiler fluctuates in the range of hundreds of thousands to several million, and the specific price still depends on a specific type of boiler equipment.

For users who use industrial steam boilers, they must pay attention to the failure of the downcomer with steam. Once the boiler's downcomer contains steam, it will easily cause the boiler to malfunction, causing serious consequences, and endangering personal health and economic property.

For industrial steam boilers, what is the hazard of carrying steam in the downcomer? Let Song Gong, the boiler technical engineer of Zhengzhou Fangkuai Boiler Factory, tell everyone the answer.

When the water in the downcomer contains steam, the average density of the working fluid in the downcomer will decrease, and the cyclic motion head will decrease. At the same time, the average volume flow of the working fluid will increase, and the flow velocity will increase, resulting in an increase in flow resistance, resulting in overcoming the resistance of the rising pipe. The reduction of the capacity and the reduction of the circulating water speed increase the possibility of failures such as circulation stagnation and reverse flow.

However, Song Gong also reminded everyone here that industrial steam boilers also have measures to prevent steam in the downcomer.

For industrial steam boilers, some measures are mainly taken in the structural design for the reasons for the steam, such as: installing a cross baffle or grille at the entrance of the large-diameter downcomer; increasing the low enthalpy of the feed water and introducing the low enthalpy feed water to Inside (or near) the inlet of the downcomer. To prevent the downcomer from heating, specify the distance between the steam-water mixture and the inlet of the downcomer, and the downcomer is led out from the bottom of the steam drum. During operation, attention should be paid to maintaining the water level of the steam drum to prevent the downcomer from carrying steam when it is too low.

After all, industrial steam boilers are still pressure vessels. In the process of using the boilers, users must first put safety issues first, and guide the boiler workers to regularly inspect the operation of the boiler, and solve the problems in time to avoid major disasters.

If an enterprise wants to purchase a highly cost-effective industrial boiler, it must first have an understanding of the manufacturers that produce industrial boilers on the market. As the saying goes, knowing oneself and the other can survive all battles.

Zhengzhou Fangkuai Boiler Factory will introduce some manufacturers of industrial boilers currently on the market, and also help you to better sort out the boiler brands.

The manufacturers of industrial boilers import: Palmer Leishi from Germany, Wilma and Dukakis from the United States. The joint ventures include: Fangkuai Boiler, Star Boiler, Qingdong Boiler, Fulton, and domestically produced: Anxin Boiler, Boruite Boiler, Tai'an Mountain Boiler, and Big Buffalo Boiler.

Which brand of industrial boiler is good? Generally speaking, which brand is good or bad, firstly depends on what price you need, what fuel you use, what is the purpose and purpose of buying the boiler, whether it is used for industrial production, community, school central heating, or individual need. Also choose import or domestic import. At present, there are many boiler brands, and the domestic initial investment is small, but the service life is not long. The initial investment of import is slightly larger, but the use process is more energy-efficient and the service life is relatively long.

Generally speaking, when choosing industrial boilers, in addition to purchasing boilers, you also need to screen boiler manufacturers. Cooperating with a company with strong comprehensive strength and guaranteed after-sales service can save a lot of trouble in the later stage.

The use of industrial boilers can be said to be very extensive. It can be used in industrial manufacturing such as chemical industry, papermaking, building materials, etc., and can also be used in hospitals, food processing plants and other places to achieve disinfection and sterilization. So, for these enterprises, it is very important to choose to cooperate with an industrial boiler manufacturer with strong comprehensive strength and provide them with an industrial boiler that is energy-saving, low-emission, safe and has a long service life.

How to screen out industrial boiler manufacturers with strong comprehensive strength that can meet user needs? Let Song Gong, the boiler technology expert of Zhengzhou Fangkuai Boiler Factory, tell you the answer.

To judge the overall strength of an industrial boiler plant, first let the qualifications speak for themselves. The manufacturing grades of industrial boilers are divided into four grades: A, B, C, and D. Grade A is the highest and Grade D is the lowest. Generally speaking, the higher the level, the better the boiler production qualifications. Both the product selection and the process methods used are very advanced. This also plays a role in ensuring the quality of the boiler for users.

Secondly, it depends on the overall scale of the boiler plant. After all, industrial boilers belong to the heavy industry manufacturing industry. In the process of construction period production and subsequent test experiments, there needs to be enough space and site to complete. If the total production area of ​​a boiler company is very small, once the user orders increase, the production machinery cannot even be turned on, which will eventually delay the user's construction period.

Another thing to look at is the after-sales service level of industrial boiler manufacturers. Many companies that have used boilers for many years understand that boilers are consumables and must be solved by professionals in the event of a failure. Many companies do not know the internal structure of the boiler and need to be completed by professional technicians from the boiler manufacturer. Then, the after-sales service level of the manufacturer is very important. Whether it can provide boiler spare parts, whether it can quickly assign after-sales engineers to help customers deal with problems, these are the main points of investigating the comprehensive strength of a boiler factory.

The installation of economizers and condensers for industrial boilers can effectively improve the operating efficiency of the boilers and reduce the temperature of flue gas emissions, thus saving energy and reducing emissions. Today, Zhengzhou Fangkuai Boiler Company will focus on the energy-saving accessories for you.

In the economizer equipment, if the user uses it improperly, over time, it will cause the economizer to wear out, which is very unfriendly to the boiler. To avoid this problem, we must first understand the causes of the wear and tear of the economizer, and then prescribe the right medicine and solve it in a targeted manner.

When the flue gas enters the vertical flue where the economizer is arranged from the horizontal flue, due to the centrifugal force generated by the flue gas's turning flow, most of the ash particles are thrown to the rear wall of the tail flue, causing the fly ash concentration in this part to be greatly increased. Increase, causing the boiler

The economizer pipe section near the wall is severely worn.

When there is a large gap between the tube and the wall of the economizer close to the wall or there is a flue gas corridor between the tube rows, the flow resistance of the flue gas in the flue gas corridor is much smaller than the resistance at other places. The flow rate is high. Therefore, the pipe or elbow next to the flue gas corridor is prone to severe wear. Practice has proved that the flue gas flow rate in the tube bundle is 4～5m/s, while the flow velocity in the flue gas corridor will be as high as 12-15m/s, which is 3～4 times that of the former, and its wear rate will be dozens of times higher. Because the degree of pipe wear is approximately proportional to the cube of the smoke velocity.

Knowing the reasons for the wear of the economizer, we can propose specific methods to prevent wear.
       (1) Protective tile: Cover the heated surface that may be severely worn with a cover, and only need to replace the worn protective tile during maintenance.
       (2) Protective curtain: Use curtains to protect the entire row of straight pipes or whole elbows in the flue gas corridor and near the wall.
       (3) Partial use of thick-walled pipes: when the pipes are densely arranged and it is difficult to install or replace the protective tiles, a section of thick-walled pipes should be appropriately used in places that may be severely worn to extend the service life.
       (4) The heating surface is turned over: due to uneven wear, in order to make the heating surface of each part basically reach the same service life, the economizer adopts the method of turning over, that is, the economizer is removed and turned over during the overhaul. , And then put it in (replace the unqualified pipe), so that the side that has been worn thinner is on the back of the flue gas, and the side that has not been washed by the flue gas is adjusted to face the flue gas flow, which reduces the cost , It also improves the service life of the energy saver.

In the boiler equipment, the air preheater is also referred to as the heat pipe air preheater, generally referred to as the air preheater. The air preheater can improve the heat exchange performance of the boiler and reduce the heat loss.

The Euromonitor series gas-fired steam boiler launched by Fangkuai Boiler Factory has added the air preheater as an important accessory. After relevant tests, data proves that with this accessory, the boiler can save energy by at least 10%. So, how does the air preheater achieve this 10% energy saving rate? Let the after-sales engineer Xie Gong of Zhengzhou Fangkuai Boiler Factory tell you the answer.

The air preheater uses the heat of the boiler tail flue gas to heat the air required for fuel combustion to improve the efficiency of the boiler. The air preheater is the flue gas in the boiler tail flue through the internal heat sink to preheat the air before entering the boiler The heated surface to a certain temperature. Used to improve the heat exchange performance of the boiler and reduce energy consumption. Generally referred to as an air pre-controller. According to the difference in structure, the air preheater can be divided into two types: tube box type and rotary type. The rotary type is divided into two types: wind hood rotary type and heating surface rotary type. At present, power plant boilers often use heating surface rotary preheaters. The application in boilers is generally two-cell, three-cell, and four-cell types, among which four-cell bins are more commonly used in circulating fluidized bed boilers.

The function of the air preheater is mainly to transfer the heat carried in the flue gas discharged from the flue at the tail of the boiler to the air before entering the boiler through the heat sink, and to preheat the air to a certain temperature. The heat pipe air preheater uses the heat energy of the flue gas at the outlet of the boiler to transfer heat through the superconducting heat pipe to preheat the combustion air of the boiler or other drying purposes.

Of course, we also want to remind everyone to pay attention to the corrosion and ash accumulation of the air preheater, which is harmful to the boiler.

Because the air preheater is located in the lowest flue temperature area in the boiler, especially the cold end of the final air preheater, the air temperature is the lowest, the flue gas temperature is also the lowest, and the heating surface wall temperature is the lowest, so it is most prone to corrosion and dust accumulation.

In an industrial boiler system, the normal operation of the system cannot be maintained as long as there is a boiler. A series of auxiliary equipment such as burners, water tanks, economizers, condensers, water pumps, instrument valves, etc. are also needed to make the whole The system keeps running. Among them, the burner is the most important auxiliary equipment. Zhengzhou Fangkuai boiler manufacturer recommends that everyone should pay equal attention to the choice of burners when purchasing industrial boilers.

In industrial boiler equipment, the burner is a device that continuously sends fuel and air into the furnace, rationally organizes the fuel flow, and makes a good mixture of fire and combustion quickly and stably.

According to the shape of the burner, the burner can be divided into two types: round and slot (groove). According to the air flow conditions of the burner, it is divided into two types: direct flow and swirl flow. DC burners are generally arranged in four corners, while swirl burners are often arranged in the front wall, front and rear walls, and on both sides.

The four-corner direct current burner is a relatively common burner type. The structure of this burner varies according to the type of fuel and the delivery method. Part of the nozzles can swing up and down and all adopt tangential combustion.

Everyone should pay attention to the fact that when choosing a four-corner direct-flow burner, if the airflow is found to be biased, it must be handled carefully, otherwise it will have a great impact on the fuel combustion.

The main reasons for the flow bias of the DC burner are as follows:
       (1) The pressure on both sides of the jet is different. Under the action of the pressure difference, it is pressed to one side to produce a deflection. Because the four-corner jet of the direct current burner is tangent to the imaginary circle in the center of the furnace or the cross section of the furnace is not square, the angle between the two sides of the jet and the furnace wall is different. The side with a large included angle has a large space, and the high-temperature flue gas from the furnace is sufficient to supply air to the space; while the side with a small included angle is insufficient, the static pressure on the side with the large included angle is higher than the side with the small included angle. Under the action of the pressure difference, the jet deflects to the side with the smaller included angle. The greater the difference between the width and depth of the furnace, the larger the diameter of the tangent circle. The greater the difference in the angle between the two sides, the greater the pressure difference and the greater the jet deflection.
       (2) The jet is forced by the lateral thrust of the jet from the adjacent corner burner upstream of the burner to force the airflow to deflect.
       (3) The rigidity of the jet itself also affects the deflection of the airflow. The higher the jet velocity, the greater the momentum, the larger the nozzle cross-sectional area, and the smaller the nozzle aspect ratio, the stronger the rigidity and the smaller the jet deflection. Conversely, the worse the rigidity, the greater the deflection of the airflow.

Most industrial boilers are special equipment. From design, manufacturing, commissioning, and operation, they must comply with strict quality and safety regulations. This is to enable the boiler to have a higher safety factor; including the selection of the furnace worker, you must choose Those with rich experience and relevant qualification certificates are good. Today, Song Gong from Zhengzhou Fangkuai Boiler Factory came to talk to you about the use of safety valves, an important safety protection equipment in industrial boiler equipment.

The safety valve is a safety device installed to prevent explosion caused by excessive pressure in abnormal conditions in industrial boiler equipment and containers. When the pressure in the boiler is too high, the safety valve will automatically open, and then automatically close when the pressure drops to a safe range to prevent the equipment from exploding due to excessive pressure. Generally, the constant pressure of the safety valve is 1.05 to 1.10 times of the operating pressure.

According to the different structure and principle of action, safety valves can be divided into gravity type, lever type, spring type and other types. The lever type is more suitable when the working temperature is high and the pressure is not too high; the spring type should be used for high-pressure equipment; generally, the spring type safety valve is commonly used.

The operating principle of the spring-type safety valve is that when the boiler is operating normally, the downward force of the spring is greater than the upward force of the fluid on the valve core, and the safety valve is closed. Once the fluid pressure exceeds the allowable pressure, the upward force of the fluid acting on the valve core increases, the valve core is pushed open, and the fluid overflows. After the fluid pressure drops below the spring force, the spring presses the valve core to force it to close.

Regardless of the type of boiler equipment, it needs to release heat energy after combustion to promote the normal operation of the boiler, and this is no exception for oil and gas boilers.

In oil-fired and gas-fired boiler equipment, whether the fuel is completely combusted is critical to the operating efficiency of the boiler. If the fuel burns more fully, the calorific value released is higher, which will also improve the overall operating efficiency of the boiler after it is passed to the boiler. So, how to ensure that the fuel of the oil-fired gas boiler can be completely burned? Let the technical engineer of Zhengzhou Fangkuai Boiler Factory tell you the answer.

First of all, we need to understand what it means to completely burn fuel.

After the combustible components in the fuel are burned, all combustion products that can no longer be oxidized, such as CO2, SO2, H2O, etc., are called complete combustion.

If there is complete combustion, there will be incomplete combustion. If the fuel is incompletely burned, it will inevitably cause the boiler operating efficiency to decrease.

Incomplete combustion means that part of the combustible components in the fuel does not participate in the combustion during the combustion process, or although combusted, there are still combustible gases CO, H2, CH4, etc. in the generated flue gas, which is called incomplete combustion.

After everyone fully understands the meaning of full combustion and incomplete combustion of fuel in oil and gas boilers, it is possible to prescribe the right medicine to solve the problem of incomplete fuel combustion.

Oil-fired hot water boilers are a common type of boiler equipment in the heating season. The boilers have high operating efficiency and relatively low pollutant emissions. Moreover, oil fuels are easily available in any region of China, and there is no difficulty in using fuel. The problem. So, what problems should be paid attention to when using oil-fired hot water boiler for heating in winter? Let Zhao Gong, a boiler technology expert from Zhengzhou Fangkui Boiler Factory, tell you the answer.

Oil-fired hot water boilers should be noted when heating in winter: the boiler room should take into account the possibility of development and expansion, and the location of its auxiliary room should not hinder the development of the boiler room. If the boiler room is in the plant area and living area, it is generally closed, but it can be arranged in the open air in the dust removal and air induction parts.

Adjustment aspects and adjustment of work size or switching pressure control debugging in oil-fired boilers: under normal circumstances, it is 0.9MPa to small fire, 0.8MPa to big fire. Automatic furnace shutdown and start-up: when the working pressure is 0.8-1MPa, it is adjusted to 1.02MPa to stop the furnace and 0.82NPa to start the furnace.