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1. Reduce the particle size of the material and maintain the average. The finer the particle size of the feed material, the better the uniformity of the flow, and the smaller the retardation trend in the system. On the other hand, the smaller the particle size, the larger the heat-receiving area and the higher the evaporation intensity. . In contrast, the large particle mass is easy to form a gas film layer and a hard layer to prevent heat transfer and mass transfer of the inner layer material. Therefore, when drying clay or shale, the material should be crushed first. For wet clay with high viscosity and high moisture, its crushing is a problem.
2, improved feeding mode Tumble dryer almost all use oblique pipe feeding. Due to the high furnace temperature and large load change, the slide tube is washed and oxidized by the hot flue gas, and the deformation and damage phenomenon is very serious, and the replacement is quite troublesome. What is more serious is that the tube that bends and deforms often shakes the top of the furnace or the flame blocking ring of the dryer, resulting in leakage of air and leakage, which will greatly reduce the thermal efficiency and service life of the dryer. Regardless of whether the pipe is made of steel or cast iron, the problem of short service life cannot be solved well. In order to extend the service life of the dryer feeding tube, the inclined tube can be changed to the form of "straight tube + lower groove plate". The upper section is straight pipe type, the straight pipe is built into the furnace wall to avoid the high temperature oxidation and the hot smoke gas scouring; the lower part is the oblique slab, the material falling from the straight pipe is taken, and then the material is slid into the drying along the inclined surface. machine. The chute plate is made of refractory cast iron, and the underside is supported by the refractory bricks. The modification of the feeding pipe should be carried out together with the modification of the hot blast stove and the sealing ring.
3. Renovation of hot blast stove At present, the hot blast stoves used by cement enterprises mainly include three types of furnaces: stratified furnace, pulverized coal furnace and boiling furnace. The number of stratified furnaces accounts for about 50% to 55%, and the pulverized coal furnace accounts for about 10%. %~15%, boiling furnace accounts for about 25% to 30%. The layer furnace has low thermal efficiency, high labor intensity, large pollution, high quality requirements for coal, low temperature and long life. However, due to its low one-time investment, it was adopted by most small and medium-sized enterprises before the introduction of the boiling furnace; the thermal efficiency of the pulverized coal furnace is higher, but the coal quality and coal-fired particle size are higher, and the electricity in the pulverized coal preparation process High consumption, large wear of coal mill, high maintenance cost of equipment, serious pollution, and in-furnace desulfurization in the combustion mode, thus limiting its development. The high-temperature flue gas boiling furnace has a burn-up rate of over 99% and high thermal efficiency. It is characterized by good adaptability to fuel, combustible with various inferior fuels; simple preparation process of fuel; stable heat supply and wide range of load regulation; high degree of automation and good controllability; combustion process is sub-high temperature combustion, NOx generation The amount is small, and after the limestone is mixed, the sulfur-fixing desulfurization in the furnace can be realized (the desulfurization rate is more than 85%), which has the advantages of environmental protection and energy saving, can enhance the heating, increase the output, and ensure the quality. The fluidized bed cleaning and burning project has been included in the national “climbing plan†and is the current energy-saving furnace type.
The energy conservation and environmental protection program needs special attention in the second five years, so we are importing advanced energy-saving technology companies, efficiency, in the past more emphasis on energy-saving production, the efficiency of the machine to the Zui to meet customer needs .
How to improve the drying efficiency of the dryer and reduce the heat energy consumption
Dryers are widely used in building materials, metallurgy, chemical industry, cement industry to dry slag limestone, coal powder, slag, clay and other materials. The mine dryer has the advantages of excellent production, stable performance, advanced technology, high output, low energy consumption, small floor space and high mechanization. It is an indispensable device for drying materials. In order to increase the production and energy saving of the drying system, how to improve the drying efficiency of the dryer and reduce the heat energy consumption. When designing the drying line, it is necessary to seek reasonable allocation of the drying equipment; for the completed production line, the drying line should be improved with new technology. The following are two premise assumptions for the energy-saving retrofit of the dryer.