Desulfurization wastewater concentration and zero discharge treatment process based on flue gas evaporation

Abstract

The invention relates to a process and belongs to the field of wastewater treatment. A desulfurization wastewater buffer pool, an integrated coagulation clarification device, a sludge concentration box, a sludge dewatering device, a passivation reaction device, a standby heat source heating device, a low-temperature flue gas evaporation concentration device, a neutralization pool, a precision filtering device and a bypass flue evaporation drying device are included. The desulfurization wastewater buffer pool is connected with the integrated coagulation clarification device, the integrated coagulation clarification device is connected with the passivation reaction device, the passivation reaction device is connected with the standby heat source heating device, the standby heat source heating device is connected with the low-temperature flue gas evaporation concentration device, and the low-temperature flue gas evaporation concentration device is connected with the neutralization pool. The neutralization pool is connected with the precision filtering device, and the precision filtering device is connected with the bypass flue evaporation drying device, The sludge concentration box is connected with the integrated coagulation clarification device, and the sludge dewatering device is connected with the sludge concentration box. The treatment process is simple, reasonable, safe, reliable, low in energy consumption and low in investment and cost.

Description

technical field [0001] The invention relates to a treatment process, in particular to a desulfurization wastewater concentration and zero discharge treatment process based on flue gas evaporation, which belongs to the technical field of wastewater treatment. Background technique [0002] At present, the specific processes for the zero-discharge treatment of desulfurization wastewater from coal-fired power plants mainly include the following: [0003] ① Desulfurization wastewater→neutralization and softening of sediment→deep filtration→steam heating→high temperature flue gas bypass evaporation zero-emission treatment process. For example, the Chinese patent with the application number of 201710427299.2 is to firstly treat the desulfurization wastewater by dosing, neutralizing, softening and precipitating, and then filter the treated effluent to remove suspended solids. The steam heats the wastewater, and then the wastewater enters the buffer tank and is pumped to the bypass ...

AI Technical Summary

Problems solved by technology

In this patented technology, the desulfurization waste water is evaporated and concentrated by low-temperature flue gas, and the concentrated liquid is clarified by adding chemicals. The evaporation system adopts the rotary atomization method to realize the atomization of wastewater. For the working condition with small water volume, the investment cost and operation cost per ton of water of the system are relatively high; because the high concentration of chloride ions in the desulfurization wastewater is highly corrosive, the system equipment The anti-corrosion level is higher, and the system investment will be higher; the bypass flue evaporation system of this patent technology adopts the design of one furnace and one tower, and the system investment and operation cost will be higher for multi-unit wastewater treatment projects

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