Leachate concentration treatment method based on flue gas waste heat

Abstract

The invention discloses a leachate concentration treatment method based on flue gas waste heat, wherein the method comprises the steps: firstly, leading leachate formed by fermenting wet garbage out of a fermentation tank, and then primarily filtering the leachate through a grid or a macroporous filter screen to remove large particles in the leachate; then introducing the filtered leachate into a centrifugal separator, separating the filtered leachate into generated sludge and clear liquid in a centrifugal separation mode, and concentrating the generated sludge and then feeding into an incinerator to be incinerated together with fermented wet garbage for power generation; feeding the clear liquid into a negative-pressure evaporator for high-temperature negative-pressure evaporation, and condensing and collecting steam generated after evaporation by a condenser; and finally, feeding the cooled liquid recovered and collected by the condenser into an MBR-NF-RO system for advanced treatment. In the third step, the negative-pressure evaporator is directly heated by waste heat flue gas generated by a incineration generator set. By means of the mode, tail gas waste heat loss can be reduced, the treatment pressure of an advanced treatment system is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of garbage power generation, in particular to a leachate concentration treatment method based on waste heat of flue gas. Background technique [0002] In the process of waste incineration power generation, in order to increase the average calorific value of waste raw materials and increase the furnace temperature of the incinerator, the general method is to place the collected waste raw materials in the storage area for storage and fermentation. During the fermentation process of organic matter in waste, a large amount of The water in the water is mixed with the small molecular substances produced by decomposition and separated in the form of leachate. For the leachate, in order to prevent the leachate from polluting the environment, the general conventional treatment method is to use "anaerobic UBF + MBR + NF + RO" process, but due to the complex components in the leachate, the pressure on the purification equipment ...

AI Technical Summary

Problems solved by technology

[0002] In the process of waste incineration power generation, in order to increase the average calorific value of waste raw materials and increase the furnace temperature of the incinerator, the general method is to place the collected waste raw materials in the storage area for storage and fermentation. During the fermentation process of organic matter in waste, a large amount of The water in the water is mixed with the small molecular substances produced by decomposition and separated in the form of leachate. For the leachate, in order to prevent the leachate from polluting the environment, the general conventional treatment method is to use "anaerobic UBF + MBR + NF + RO" process, but due to the complex components in the leachate, the pressure on the purification equipment is relatively high, and after the flue gas formed after waste incineration for power generation is heated to the steam boiler, the temperature of the flue gas is still high, and the general tail gas treatment system is Purify the exhaust gas after heat exchange and discharge it directly, which will cause the heat energy in the exhaust gas to be lost in vain

Images