Desulfurized wastewater spray evaporation treatment device with bypath system

Abstract

The invention provides a desulfurized wastewater spray evaporation treatment device with a bypath system and relates to zero-emission treatment of desulfurized wastewater of a thermal power plant. The desulfurized wastewater spray evaporation treatment device is provided with a bypath flue subsystem, a desulfurized wastewater spray evaporation subsystem and a control unit; the bypath flue subsystem is provided with a bypath flue, a bypath flue regulating valve and a high-temperature flue gas nozzle; the desulfurized wastewater spray evaporation subsystem is provided with a spraying device, a desulfurized wastewater pipeline regulating valve and a water pump; the control unit is provided with a control processor, a bypath flue electric executing mechanism, a desulfurized wastewater pipeline electric executing mechanism, a bypath flue flow transmitter, a bypath flue temperature transmitter, an air pre-heater outlet flue flow transmitter, an air pre-heater outlet flue temperature transmitter, a desulfurized wastewater pipeline flow transmitter and a desulfurized wastewater pipeline temperature transmitter. The desulfurized wastewater spray evaporation treatment device has a relatively good effect of heat exchange on desulfurized wastewater, is safer and more reliable and saves more power; the desulfurized wastewater spray evaporation treatment device has no nitrogen oxide standard-exceeding risks, a simple structure and no heat exchange loss and partial resistance. Power units including a draught fan and the like do not need to be additionally arranged so that the cost is low.

Description

technical field [0001] The invention relates to zero-discharge treatment of desulfurization wastewater in a thermal power plant, in particular to a spray evaporation treatment device for desulfurization wastewater with a bypass system. Background technique [0002] Chinese patent 201520136263.5 discloses a preheating spray evaporation system for desulfurization wastewater, which is connected to the flue, including a dust collector, a high-efficiency cyclone separator, a waste liquid delivery pipe, and a waste liquid atomization device. The dust collector is arranged on the flue, and the waste liquid The conveying pipe is connected with the high-efficiency cyclone separator, the high-efficiency cyclone separator is connected with the waste liquid atomization device, the waste liquid atomization device is connected with the flue, and the waste liquid preheating device is also included, and the waste liquid preheating device is connected with the The high-efficiency cyclone sep...

AI Technical Summary

Problems solved by technology

This device has the following disadvantages: First, because the raw flue gas contains a large amount of dust, it is easy to cause blockage of the shell-and-tube heat exchanger

The device has the following disadvantages: First, a certain amount of high-temperature flue gas drawn from the flue of the boiler economizer has not been denitrified, which may easily cause the nitrogen oxides at the main exhaust to exceed the standard

Secondly, since the downstream of the evaporation tower is directly connected to the desulfurization tower, part of the evaporated crystals are easily taken out by the flue gas and enter the desulfurization tower, resulting in the enrichment of pollutants, which cannot achieve zero discharge of desulfurization wastewater in the true sense.

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