Generally speaking, the crusher will not clog in the mineral sizers when the dry coal shed is large enough for the coal to dry. But if there is no investment in dry coal shed or the coal supply is wet, the general moisture is more than 8-12%(different kinds of coal plugging degree), hammer crusher is easy to jam. For example, It is impossible for the hammer crusher to be non-occlusive when the water is large, when they analyzed the non-occlusive crusher produced by a famous domestic enterprise in the use of New toothed roll Crusher in Coal gangue Power Plant. For another example, in Shandong Haihua circulating fluidized bed power plant, the hammer mill non-plugging crusher is very serious, and the output is less than 60% of the rated output. According to the sample data provided by Haihua Power Plant, the actual coal moisture content is 9.59%. If the hammer crusher is used in this working condition, it is bound to affect the normal operation of the equipment, and the sieve is easily blocked in the operation of the mining conditions with high moisture and impurity content, affecting the normal work of the equipment and production line.
Two, there are many factors affecting the boiler thermal efficiency in coal saving. The carbon content of CFBB slag with normal combustion can reach below 1.8%, while the carbon content of fly ash is as high as 30~50%, or even higher. This makes the boiler only mechanical incomplete combustion heat loss of more than 10% or even more than 20%. Combined with other inevitable heat loss (about 10% or more), the boiler thermal efficiency is very low. Obviously, in order to improve the thermal efficiency of CFBB, it is necessary to solve the burning degree problem of fly ash while reducing other heat losses. The burning degree of fly ash is inversely proportional to the amount of overbreaking. Ultrafine particles have a short residence time in the furnace and are taken out of the furnace when they are completely burned. The coal particles that are taken out of the furnace are separated at the end of the separator and enter the tail flue with the flue gas. When they are burned in the tail flue, the combustible materials of fly ash are often greatly increased. It also reduces the efficiency of coal combustion. Therefore, CFBB requires strict control of coal particles less than 1mm no more than 30%. mineral sizers and the hammer crusher work differently. No breakage occurs. L toothed roll crusher uses the hard crushing principle and tensile breaking principle. In the crushing process, there is a certain gap between rollers, and the gap remains unchanged in the normal crushing process. Its crushing size is determined by the gap between rollers. Therefore, there is basically no crushing; Any hammer crusher adopts the principle of impact crushing. Due to the high-speed rotation of the hammer head, the crushing machine has no choice to break all the materials between the crushing hammer head and the hammer plate, that is to say, the crushing machine should re-break the materials that do not need to be re-broken. In this way, resulting in a large increase in overbreakage, fine powder greatly increased. For CFBB, there is no doubt that combustion efficiency will be reduced. Often no plugging crusher broken material grab a handful, visual inspection can be found to be fine particles and fine powder, powder amount is quite large. According to our coal consumption statistics of Baima, Pingmei Group Hangkou Power Plant and other enterprises, comparing with the hammer crusher and mineral sizers, these enterprises use about 3%-5% less coal per KWH of electricity. One of our customers used to use the hammer crusher. Based on a comprehensive investigation of the effect of our company's users, they drew the following conclusions in their "Crushing System Technical Improvement Feasibility Report" : They currently use 300,000 tons of coal every year. If the coal consumption is reduced by one percentage point, 3,000 tons of coal can be saved, which is estimated to save 1.59 million yuan a year, and the economic benefits are quite considerable. In addition, the factory uses bituminous coal, according to the market price of bituminous coal 530 yuan per ton, 1000 tons a day, and the market price of high viscosity white coal 500 yuan/ton, such as the use of our company's crusher can add white coal without plugging coal, add 450 tons a day, a month can reduce the production cost of 405,000 yuan, It is estimated that the production cost can be reduced by 4,927,500 yuan a year. To sum up, the company can save 5.527,500 yuan a year with only the most conservative calculation of coal. Three, energy saving to the crusher with an hourly output of 250 tons as an example, a 250 ton hammer crusher motor power is more than 310KW (if it is a two-stage crushing power is greater), run 8 hours a day, electricity consumption is 2480 degrees. Crusher motor power of 200KW working 8 hours a day power consumption of 1600 degrees, can save 880 degrees of electricity a day, each degree of electricity calculated according to the on-grid electricity price 0.56 yuan, can save 492.8 yuan a day, estimated to save 147,800 yuan a year (a year based on 300 days of work). 1. There is no need for precipitator investment. Hammer crusher speed is very high, the blast volume is very large, coupled with a large amount of powder, inevitably cause dust flying. The dust collector needs to be put in to solve the dust problem and increase the investment and maintenance points of fixed assets: The air eddy generated by the four rollers of the crusher during work cancells each other in the crushing chamber formed between the first and second rollers. Therefore, the absolute difference between the feed negative pressure and discharge positive pressure is very small. mineral sizers have a slight sense of wind when the crusher is operating under load, and the blast volume is not more than 1000m3/h. Therefore, the dust is small, there is no need to invest in the dust collector. 2. There is no need to invest in the damping platform. The dynamic load of hammer crusher is 5-8 times of the static load, in the process of equipment operation will produce a lot of vibration, need to increase the investment of vibration damping platform to reduce the vibration, the crusher uses different vibration frequencies of the working pair cancel each other, so that the vibration and noise of the main engine is very low, the dynamic load is only 1.3 times of the static load. No further investment in the damping platform is required to ensure the safe operation of the equipment. 3, no vibrating screen. Because the crusher is selective when crushing the material, the material is all in and all out, the system does not need vibrating screen.
3. 4. Reduced investment in infrastructure. Because the vibrating screen is canceled, the screening system is removed, so the crushing building should be at least one floor lower than the hammer crusher, so the construction will save a lot of funds. 5. High voltage transformer is not needed. Generally more than 250 tons of hammer crushing because the motor is above 280 kW, high voltage motor should be used, so high voltage transformer should be equipped. The crusher does not need a transformer because it uses a low-voltage motor. 1. The service life of the dental plate in mineral sizers is long. Especially with the development of the fourth generation of the liquid-liquid composite dental plate, the service life of the dental plate is greatly extended. 2, HL crusher tooth plate installation, disassembly is convenient, especially the use of automatic wedge device, further realizes the rapid replacement of tooth plate, thus greatly reducing the labor intensity of workers.
Four, noise reduction because the hammer crusher adopts the impact crushing theory, the noise in operation is relatively large. The general noise is above 100dB(A), which seriously affects the physical and mental health of coal workers. Because the crusher adopts the splitting, folding and breaking theory with the lowest noise, the noise is only 85dB(A), which is close to the asynchronous motor. To sum up, with the mineral sizers, we can not only achieve very good economic benefits, but also improve production efficiency, prevent environmental pollution, save energy, protect the health of staff and achieve good social benefits. Note: The use of coal screen toothed roll crusher scheme can reduce the output requirements of the crusher in the selection, but it is difficult to avoid the sieve jam, and increase the cost of the crushing building construction and increase the failure and maintenance points in operation;