A coal-fired boiler is a common industrial device that works by burning coal to produce high-temperature flue gas, transferring heat energy to water, resulting in steam or hot water. During the operation of coal-fired boilers, due to the erosion and erosion of high-temperature flue gas and water vapor, the requirements for boiler lining materials are very high. As a commonly used refractory material, refractory bricks have good high temperature resistance, thermal shock resistance and slag erosion resistance, so they have been widely used in the lining of coal-fired boilers. This article will introduce the refractory bricks for 1600 degree coal-fired boilers in detail.
First of all, let's understand the basic concept of refractory bricks for coal-fired boilers. Refractory brick is a kind of refractory material made of refractory raw materials as the main raw material, through molding, drying, firing and other processes. The main components of refractory bricks for coal-fired boilers are natural minerals such as kaolin, bentonite, and diatomaceous earth, which will undergo sintering reactions at high temperatures to form hard ceramic bodies. Refractory bricks for coal-fired boilers have good high temperature resistance, thermal shock resistance and slag erosion resistance, so they are widely used in the lining of coal-fired boilers.
Next, let's take a look at the performance characteristics of refractory bricks for 1600 degree coal-fired boilers. Refractory bricks for 1600 degree coal-fired boilers mainly have the following performance characteristics:
Good high temperature resistance: the refractory degree of refractory bricks for 1600 degree coal-fired boilers is generally between 1700-1800, which can meet the requirements of coal-fired boiler lining.
Good thermal shock resistance: Refractory bricks have good thermal shock resistance at high temperatures, and can resist the risk of cracking caused by rapid temperature changes.
Strong resistance to slag erosion: refractory bricks have good resistance to slag erosion, can resist the erosion and erosion of high-temperature flue gas and water vapor, and prolong the service life of coal-fired boilers.
Good wear resistance: refractory bricks have good wear resistance at high temperatures, which can resist the friction and wear of pulverized coal and reduce the loss of lining materials.
Convenient construction: The forming process of refractory bricks is simple and easy to construct, which can meet the different shape and size requirements of coal-fired boiler lining.
*Moderate: Compared with other high-performance refractory materials, the refractory bricks are more moderate and have a higher cost performance.
Finally, let's take a look at the construction method of refractory bricks for 1600 degree coal-fired boilers. The construction of refractory bricks for 1600 degree coal-fired boiler mainly includes the following steps:
Cleaning the base surface: Before construction, it is necessary to clean the base surface of the inner lining of the coal-fired boiler to remove oil, rust and other debris to ensure the adhesion between the refractory bricks and the base surface.
Cutting refractory bricks: According to the shape and size requirements of the lining of coal-fired boilers, the refractory bricks are cut to meet the construction needs.
Masonry refractory bricks: The cut refractory bricks are masonry according to the design requirements, and attention is paid to the filling and compaction of the brick joints to ensure the overall stability of the lining.
Baking refractory bricks: After the masonry is completed, the refractory bricks need to be baked to make them reach the service temperature and improve their use performance.
In short, the refractory bricks for 1600 degree coal-fired boilers have good high temperature resistance, thermal shock resistance and slag erosion resistance, which can meet the requirements of coal-fired boiler lining. At the same time, the refractory bricks are moderate, easy to construct and have a high cost performance. When selecting and using refractory bricks for 1600 degree coal-fired boilers, we need to consider comprehensively according to the specific use conditions and requirements to ensure that the most suitable products are selected.
Coal-fired boiler is the main equipment for power generation in thermal power plants, there are circulating fluidized bed CFB and pulverized coal furnace, due to the high temperature of fuel combustion, the need for refractory bricks that can be used in high temperature of 1600 degrees, the following is a refractory brick for coal-fired boilers 1600 degrees, you can recommend a few for you, you can save costs while ensuring the use of the effect, please see the details.
With the continuous development and innovation of coal-fired boilers in today's modern large-scale power plants, the requirements for refractory materials in the structure of the boiler furnace wall have changed greatly, and the furnace wall is made of fixed and unshaped refractory materials, and one boiler has 6-10 refractory bricks or refractory castables and other refractory products with different performance requirements.
Coal-fired boiler 1600 degrees with refractory bricks recommended
Refractory products for coal-fired boilers at 1600 degrees include: corundum bricks, corundum mullite bricks, corundum silicon carbide bricks, etc., and amorphous refractory materials or prefabricated parts of the same material can also be selected.
1. Corundum bricks are used in key parts of industrial kilns that require wear resistance and high temperature resistance of 1600 degrees, such as slide rail bricks for steel push rod metallurgical furnaces, tapping troughs for step-by-step heating furnaces, waste incinerators, coal-fired boiler linings, petrochemical industry kiln linings, steel rolling mill bottoms, and secondary converters for ammonia furnaces.
2. Corundum mullite bricks can be used as a thermal insulation lining for high-temperature industrial furnaces, and can also be used as a working layer of 1600 degrees for other industrial high-temperature kilns, mainly used in the petrochemical industry, large and medium-sized ammonia gasifiers and magnetic gas furnaces, high-temperature industrial kilns, coal-fired boiler supporting equipment materials, etc.
3. Corundum silicon carbide bricks can be used for the lining materials of coal-fired boilers and high-temperature kiln equipment, such as the main ditch, branch ditch, slag ditch of blast furnace tapping yard, molten iron tank, mixed iron furnace, ladle, etc.
The type of coal-fired boiler in a power plant is related to the type of coal. Now the domestic refractory materials can basically meet the needs of various boilers, the introduction of units can be selected domestic refractory products can be selected according to the characteristics of the furnace
1. If the coal with low melting point ash content is used for liquid slag discharge furnace and cyclone furnace, because the furnace temperature is high, the refractory material should have the characteristics of high temperature resistance, wear resistance, thermal shock stability, high thermal conductivity and slag resistance, etc., and the silicon carbide brick or the amorphous refractory material of the same material is generally selected
2. The incineration of low volatile coal generally uses "W" flame, lays a fire belt in the furnace, and selects wear-resistant, high thermal conductivity, and good thermal shock stability of refractory materials, and generally uses silicon carbide, and high-alumina refractory bricks or plastics
3. The circulating fluidized bed boiler burns coal with low calorific value and high sulfur content, with large ash concentration, high flow rate and severe wear, and is generally used corundum, silicon carbide wear-resistant, refractory bricks or castables, prefabricated parts, etc.;
4. The incinerator of waste power plant is affected by the combustion conditions, and the refractory materials are required to have good fire resistance, volume stability, thermal shock resistance, corrosion resistance, high strength and wear resistance.
Introduction to common faults in the lining of refractory bricks for coal-fired boilers in power plants.
1) The heating surface of the boiler presents a slag phenomenon.
In the process of operation of the boiler of coal-fired power plant, the temperature of the incineration center in the furnace can reach more than 1500 1600, and the lining requirements for refractory brick masonry are relatively high. In such an environment, the coal ash will be melted in most cases. In general, the furnace chamber of the boiler of a coal-fired power plant has a more intense cooling ability, which ensures that the furnace smoke is reduced to the softening temperature of the ash at a faster rate when the furnace outlet is nearby. It should be noted that if the cooling ability of the furnace itself is not good, it will make its own incineration center skewed, and even show overload operation, which will cause the smoke temperature near the water wall to be too high, and the molten ash can not be condensed in time, and then stick to the water wall to form the corresponding slag.
During the operation of the boiler of a coal-fired power plant, the temperature of the incineration center in the furnace can reach more than 1500 1600. In such an environment, the coal ash will be melted in most cases. In general, the furnace chamber of the boiler of a coal-fired power plant has a more intense cooling ability, which ensures that the furnace smoke is reduced to the softening temperature of the ash at a faster rate when the furnace outlet is nearby. It should be noted that if the cooling ability of the furnace itself is not good, it will make its own incineration center skewed, and even show overload operation, which will cause the smoke temperature near the water wall to be too high, and the molten ash can not be condensed in time, and then stick to the water wall to form the corresponding slag.
2) The furnace presents the problem of often saving life.
The coal-fired boiler of the power plant wants to adhere to the outstanding operation condition, and the furnace itself needs to be incinerated continuously, but in real work, the boiler often presents the problem of rescue, which is mainly because the negative pressure of the furnace itself is significantly increased, the incineration chamber gradually darkens, and the flame is not obvious. If the furnace's own flame appears to subside, the flame monitor will announce a rescue signal accordingly.
The coal-fired boiler wants to adhere to the outstanding operating condition, and the furnace itself needs to be incinerated continuously, but in real work, the boiler often presents the problem of life-saving in the furnace, which is mainly because the negative pressure of the furnace itself is significantly increased, the incineration chamber gradually darkens, and the flame is not obvious. If the furnace's own flame appears to subside, the flame monitor will announce a rescue signal accordingly.
3) The tail flue presents a secondary incineration.
In the flue inside the boiler, if the flue gas temperature increases violently, the temperature of the exhaust gas will also rise abnormally. The negative pressure of the furnace and the flue itself will be unstable, the water temperature at the outlet of the flue will not rise abnormally, the oxygen content inside the furnace will continue to decrease, and the water in the dust collector will gradually turn black.