In recent years, with the advent of energy crisis and rising energy prices, it is necessary to take measures to change the operating conditions of the slime dryer, select the slime dryer with high thermal efficiency and recover part of the heat in the exhaust gas to reduce Cost of production. According to my company's experience in manufacturing slime dryer over the years, to achieve energy-saving slime dryer operation can start from the following five aspects:
(1) reduce the heat loss during the drying process
In general, the heat loss of the dryer will not exceed 10%. If the heat insulation is suitable for large and medium-sized production units, the heat loss will be about 5%. Therefore, do slime dryer insulation system work, but not the thicker insulation better, you should determine the best insulation thickness.
Slime dryer system to prevent the leakage, the general use of blower and induced draft fan in series, the system is properly adjusted to zero pressure state operation, so you can avoid convection dryer due to leakage of dry medium or ambient air leakage Dryer thermal efficiency caused by the decline.
(2) reduce the evaporation load slime dryer
Material into the slime dryer before, through filtration, centrifugal separation or evaporator evaporation and other pre-dehydration, can increase the solid content of the material, reduce the slime dryer evaporation load, which slime dryer energy saving One of the most effective ways.
For liquid materials (eg, solutions, suspensions, emulsions, etc.), pretreatment prior to drying can also save energy because heating the material in the convection slime dryer utilizes air sensible heat while preheating Use of latent heat or waste heat of steam. For spray drying, preheating feed liquid is also beneficial to atomization.
(3) to improve the inlet air temperature slime dryer, slime dryer to reduce exhaust gas temperature
Because of the definition of thermal efficiency of slime dryer, it can be known that increasing the inlet air temperature of the slime dryer is beneficial to improve the thermal efficiency of slime dryer. However, the inlet air temperature is limited by the product's allowable temperature. In a co-current particle suspension dryer, the particle surface temperature is relatively low, so the inlet air temperature of the slime dryer can be much higher than the product's permissible temperature.
In general, the energy consumption of the convection slime dryer is mainly composed of evaporating water and exhaust gas. The latter part accounts for about 15% -40%, and some as high as 60%. Therefore, reducing the slime drying Exhaust gas temperature at the dryer outlet is limited by two factors: First, to ensure that the product moisture content (outlet exhaust gas temperature is too low, the product increased moisture content, less than the required product moisture content); second exhaust gas into the cyclone or bag Filter, to ensure that the temperature is higher than the dew point 20-60 ℃.
(4) part of the exhaust gas cycle
The slime dryer system with partial exhaust gas recirculation uses some of the waste heat in the exhaust gas to increase the thermal efficiency of the slime dryer. However, with the increase of exhaust gas recirculation, the moisture content in the hot air is increased , The drying rate will decrease, so that the drying time of the wet material increases and the cost of the slime dryer increases. Therefore, there is an optimal amount of exhaust gas circulation. The general exhaust gas circulation is 20% - 30%
(5) recovery of heat from the exhaust gas from the slime dryer
In addition to the above energy saving method utilizing part of the exhaust gas cycle for recovering heat, indirect heat exchange equipment may also be used to save energy such as heat recovery from the exhaust gas at the outlet of the slime dryer. Commonly used heat exchange devices include heat wheel heat exchange Plate, plate heat exchanger, heat pipe, heat pump and so on.
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