The nature of anti-wear work of CFB boiler

       Keywords on this page: boiler spraying, thermal spraying, supersonic arc spraying, boiler heating surface anti-wear and anti-corrosion, boiler water-cooled wall anti-wear spray, deflector anti-wear, anti-wear plate installation, longitude and latitude anti-wear, grille anti-wear, Anti-wear technology of CFB boiler

The main working principle of the diversion and anti-wear technology: The new water-cooled wall diversion and anti-wear technology is to install the deflector on the furnace wall in layers, so that the carrying material can be washed off the water wall and flow against the wall effectively, so as to change the flow direction of the material and reduce the flow rate. Material flow velocity, isolating material flow from water. The high-speed collision of the cold wall, thereby rooting. This solves the problem of water cooling wall tube wear. Although the adjustment of quality management and boiler operation is simple, how to adjust it well to achieve safe, economical and stable working conditions is not easy. Security and economy sometimes have contradictions, we must; fully understand this contradiction, we must not avoid it. , in order to be more secure. Sometimes, the focus may be on the economy, but security may be compromised, and sometimes the security may be compromised at the expense of the economy. The responsibility and central task of the operator is how to carefully adjust and deal with this contradiction; it is to ensure that the boiler operates under economical conditions while ensuring safety, so that the combustible elements in the coal can be burned in the furnace. During the reaction process, it has a good mixing and ratio with the oxygen element in the air to make it fully combusted; that is, according to the steam pressure, temperature, load, furnace temperature, medium condition, circulating material concentration, material layer difference and circulation Adjust the proportion of secondary air and the volume of air supply and induced air according to the working conditions such as the temperature of the returned ash. According to the fact that there are not many units for continuous slag discharge of boilers that have been put into operation before, if continuous slag discharge can be realized, the operation adjustment of the boiler will be much simpler. And regular slag discharge occurs that the pressure difference of a material changes with time, and there is a functional relationship between time and pressure difference. With the passage of time, the resistance of the material layer thickening increases, and the material layer difference gradually increases. Under the condition that the other parameters remain unchanged, the air supply volume decreases, the blower head increases, and the fluidization in the furnace and the material The cycles are all in a weakening direction. The operator should adjust the air supply and induced air volume appropriately according to the parameter changes, so as to ensure normal combustion and stable load. When the material layer reaches a certain thickness or reaches the specified slag discharge value for slag discharge, the blower head drops and the air supply volume rises. At this time, the fluidization and circulation develop in a stronger direction. At this time, the operator will How to solve the confusion in the anti-wear processing of CFB boilers? The amount of induced air ensures that the excess air coefficient does not change much. In the normal operation, there is often an accident that the cyclone return feeder is found to be blocked after the bottom material is discharged. The main reason is that the working conditions of the induced draft fan have changed greatly, and the air intake of the "U"-shaped return feeder under the cyclone separator comes from the secondary air system (except for the system with the return fan). When the system wind pressure drops , the resistance decreases, the air supply volume will inevitably increase, and the cycle rate will increase, which will add a new burden to the re-feeder, which is undoubtedly aggravating the "U" type re-feeder. When the output reaches the limit condition during operation! Regularly discharging the bottom material to block the return feeder has been confirmed by many practical tests, and it is reasonable to analyze the theoretical analysis in this system. Therefore, when the load and circulating material concentration are high during operation, it is safer and more reliable to put some materials first and then slag when the circulating ratio is large. In addition, the air supply volume should be readjusted during or after the slag discharge to avoid ash clogging in the "U"-shaped return feeder, and to reduce the occurrence of secondary accidents, thereby ensuring that the day will grow taller. The emerald curtain is deeply treasured and clear. Meng Yuanchun's cloud is not loose. Xiaofeng is light. The neem flowers fly and stay rainy and sunny. Author brief introduction Zhao Zifa, CFB boiler anti-wear word Junju, CFB boiler anti-wear Yan Wang Dezhao V grandson, CFB boiler anti-wear officer Bao Yilang. safe operation. However, continuous slag discharge is adopted, because the material layer difference, cycle ratio, feeding, air volume and other parameters do not change much, it can avoid the accident of blocking the feeder during the regular slag discharge process and after the slag discharge. Therefore, continuous slag discharge is recommended. The meaning of slag is far-reaching. ?The adjustment of boiler load is, in a sense, the adjustment of circulating materials. The furnaces, products, and tens of millions of products that have just been put into operation after ignition are optional The anti-abrasion technology of the anti-friction grille and the anti-abrasion of the water wall ensure the safety of the transaction. It is difficult to carry a full load for a long period of time. The root cause is that the material layer is relatively thin, the circulating material is relatively small, the circulation ratio is relatively low, and the material circulation has not been established. When the circulating material reaches a certain concentration, the cycle has formed a certain rate, and the load can be easily increased. Practice has proved that the smaller the circulating material particles, the greater the circulation rate, the higher the combustion efficiency, the less ash in the slag, the easier it is to load the furnace: the more economical the sub-run, the worse the vice versa. Therefore, it should be ensured during operation that the appropriate coal particle size and a certain gradation ratio (the ideal gradation ratio is: % below mm, % of -mm, % of -mm, - mm accounts for %, -mm accounts for % better). When conditions permit, it is beneficial for the boiler to be safe, economical, stable, and run at full load by burning some coal with a larger grindability coefficient or better ash-forming properties. The coal entering the furnace is too large and uneven (the gradation ratio is not good), the grindability coefficient of the raw coal is small, and the ash-forming property of the coal is very poor, which not only causes high pressure on the bed surface, but also causes poor fluidization. The slag discharge increases, the cycle rate decreases, and the intensified air supply will easily lead to a decrease in the combustion efficiency. Therefore, coal particle size, secondary air ratio, air supply and induced air volume, coal particle size grading ratio, raw coal grindability coefficient, circulation rate, furnace gas and solid running speed, and oxygen content in flue gas , In addition to the design, the parameters such as temperature in the furnace should also be tested in cold state: and hot state to obtain the best value for each working condition, and then it is suitable and safe to guide the operation. During normal operation, blind, disorderly and frequent operation adjustment should be avoided. ?P short transverse plates are respectively provided with inclined arc surfaces at the positions of the arc notch and the first arc notch for contacting with the water-cooling tube, and the inclined arc surfaces are inclined downward at a degree of °～°. During assembly, the short horizontal plate is attached to the water-cooled tube through the inclined arc surface, so that the short horizontal plate is inclined to the water-cooled wall, and the inclined angle is between ° ~ °, which can better ease the speed of the surface wall flow and change its flow. It can effectively reduce the wear on the water cooling wall, and the setting of the inclined arc surface makes the installation more convenient. Inspection, recording and maintenance of out-of-furnace pipes, valves, pipe fittings, elbows, elbows, headers, supports and hangers, steel beams, expansion indicators and other components. m In order to prevent or reduce the amount, supersonic arc thermal spraying is used for the water-cooling wall. Check before spraying. If the wear is serious, the thinning is relatively uniform, the area is large, and the wall thickness is less than the calculated value of the theoretical strength, it should be replaced first. Local pits are first repaired and welded, polished and smoothed, and then supersonic arc thermal spraying is performed. During supersonic arc thermal spraying, sandblasting is first used to roughen the surface of the water wall. After sandblasting, quality inspection should be carried out. The surface roughness of the water-cooled wall to be sandblasted should be appropriate and uniform. It is a special product manufacturing enterprise integrating R&D, sales and service. Long-term professional sales of longitude and latitude anti-abrasion boilers, boiler anti-abrasion grilles, Boiler grid anti-abrasion, boiler anti-abrasion, boiler thermal conductivity grid anti-abrasion technology, water wall anti-abrasion. To prevent oxidation and affect the quality of supersonic arc thermal spraying. Wear of wD ceiling tube The wear of the heating surface of the furnace top is mainly due to the fact that the gas-solid flow turns in the top area of the furnace when it leaves the furnace, which produces a centrifugal effect and throws the large particle materials to the furnace top, and the wear is relatively uniform. The new technology of water-cooled wall deflector and anti-wear is to install the deflector on the furnace wall in layers, multi-layer active! Block the wall-adhering ash flow, so that the water-cooled wall-adhering flow of the carrying material can be effectively diverted, so as to change the material flow direction and reduce the material flow velocity, which can gradually reduce the wall-adhering ash flow rate and concentration, and isolate the high-speed collision between the material flow and the water-cooled wall.

<1> Accumulated rich experience in design, manufacture, installation, commissioning and operation and maintenance.



(2) It is recognized as a promising "clean" coal combustion technology. Co is due to the characteristics of high concentration and high wind speed in the boiler.



<3> Boiler thermal conductivity grid anti-wear technology.



<4> Water-cooled wall anti-wear products are complete.



<5> Price concessions. The reason for the wear of the pipe wall in the transition area between the sanitation belt and the water-cooled wall tube at the lower part of the furnace is the change of the flow direction of the solid material along the furnace surface in the junction area.



<six> lower layer.



<7> The new pipe should be sprayed outside the furnace before installation.