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The waste heat generated in the drying process is mainly used as the heating source for the concentration and evaporation process:
1. If the waste heat contains dust, the dust must be completely removed through a wet scrubber before use.If the dust is not completely removed and directly supplied to the concentration equipment (outer wall of the heat exchange tube) for heat exchange, serious pollution will be caused;
2. Compared with the multi-effect evaporator using saturated steam, the installation space of the waste heat evaporator is 2.5-3 times larger and the equipment investment is larger. However, when the waste heat is sufficient, there is no need to use any external steam, so Can save a lot of energy costs.At the same time, waste heat is no longer directly discharged into the air, which is also a kind of environmental protection;
3. In order to use waste heat safely and effectively, it is necessary to fully grasp the conditions of waste heat, that is, waste heat flow, air content in waste heat, wet bulb temperature, thousand-bulb temperature, air pressure, etc.;
4. If the water vapor content in the waste heat is high and the wet bulb temperature is sufficiently high, the equipment investment cost of the waste heat recovery evaporator will be relatively small.On the contrary, when the water vapor content is low and the wet bulb temperature is low, the recoverable heat of the waste heat will be less, and the equipment investment amount of the waste heat recovery evaporator will also increase;
5. If clean low-temperature flash steam is available as a heat source, an exhaust gas scrubber is not required.
6. The investment in waste heat recovery, concentration and evaporation equipment is more than 2.5 times that of a general multi-effect evaporator.
The waste heat generated in the drying process is mainly used as the heating source for the concentration and evaporation process:
1. If the waste heat contains dust, the dust must be completely removed through a wet scrubber before use.If the dust is not completely removed and directly supplied to the concentration equipment (outer wall of the heat exchange tube) for heat exchange, serious pollution will be caused;
2. Compared with the multi-effect evaporator using saturated steam, the installation space of the waste heat evaporator is 2.5-3 times larger and the equipment investment is larger. However, when the waste heat is sufficient, there is no need to use any external steam, so Can save a lot of energy costs.At the same time, waste heat is no longer directly discharged into the air, which is also a kind of environmental protection;
3. In order to use waste heat safely and effectively, it is necessary to fully grasp the conditions of waste heat, that is, waste heat flow, air content in waste heat, wet bulb temperature, thousand-bulb temperature, air pressure, etc.;
4. If the water vapor content in the waste heat is high and the wet bulb temperature is sufficiently high, the equipment investment cost of the waste heat recovery evaporator will be relatively small.On the contrary, when the water vapor content is low and the wet bulb temperature is low, the recoverable heat of the waste heat will be less, and the equipment investment amount of the waste heat recovery evaporator will also increase;
5. If clean low-temperature flash steam is available as a heat source, an exhaust gas scrubber is not required.
6. The investment in waste heat recovery, concentration and evaporation equipment is more than 2.5 times that of a general multi-effect evaporator.
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