Low-water-consumption wet desulphurization method

A technology of wet desulfurization and low water consumption, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve the problems of immaturity, technology and equipment, etc., and achieve the effect of reducing processing costs and reducing processing capacity

Pending Publication Date: 2019-03-01
新疆天富集团有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the control technology and equipment for the reduction of water consumption and the reduction of desulfuriza

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0040] The flue gas desulfurization renovation project of a 300WM coal-fired unit adopts this process, and the SO in the inlet flue gas 2 The concentration is 2239mg / m 3 , the dust concentration in the inlet flue gas is 43mg / m 3 ; Humidification and cooling device 10 waste water spraying layer 10-1, 10-3 set 4 layers, the liquid-gas ratio is 3.6L / Nm 3 ; Inlet flue demister layers 10-2, 10-4 are provided with 2 layers with a width of 0.40m, and the distance between wastewater spray layers 10-1, 10-3 and demister layers 10-2, 10-4 is 0.8 m; The liquid-gas ratio of the 10-1 and 10-3 circulating liquid in the wastewater spray layer is 14L / Nm 3 , the coverage rate of wastewater spray layer 10-1 and 10-3 is 300%, the pH of desulfurization slurry is 5.30; The vertical flow velocity of wastewater in the chamber is 0.30mm / s; the SO in the outlet flue gas 2 The concentration is 12.4mg / m 3 , the dust concentration in the outlet flue gas is 2.6mg / m 3 , the purity of desulfurization ...

Embodiment 2

[0042] The flue gas desulfurization renovation project of a 300WM coal-fired unit adopts this process, and the SO in the inlet flue gas 2 The concentration is 2239mg / m 3 , the dust concentration in the inlet flue gas is 43mg / m3 ; Humidifying and cooling device 10 waste water spraying layer 10-1, 10-3 is provided with 2 layers, and the liquid-gas ratio is 3.0L / Nm 3 ; Inlet flue demister layers 10-2, 10-4 are provided with 2 layers with a width of 0.20m, and the distance between wastewater spray layers 10-1, 10-3 and demister layers 10-2, 10-4 is 0.5 m; the liquid-gas ratio of the 10-1 and 10-3 circulating liquid in the wastewater spray layer is 10L / Nm 3 , the coverage rate of wastewater spray layer 10-1 and 10-3 is 300%, the pH of desulfurization slurry is 5.30; The vertical flow velocity of wastewater in the chamber is 0.30mm / s; the SO in the outlet flue gas 2 The concentration is 12.4mg / m 3 , the dust concentration in the outlet flue gas is 2.6mg / m 3 , the purity of desu...

Embodiment 3

[0044] The flue gas desulfurization renovation project of a 300WM coal-fired unit adopts this process, and the SO in the inlet flue gas 2 The concentration is 2239mg / m 3 , the dust concentration in the inlet flue gas is 43mg / m 3 ; Humidifying and cooling device 10 waste water spraying layer 10-1, 10-3 is provided with 2 layers, and the liquid-gas ratio is 2.0L / Nm 3 ; Inlet flue demister layers 10-2, 10-4 are provided with 2 layers with a width of 0.20m, and the distance between wastewater spray layers 10-1, 10-3 and demister layers 10-2, 10-4 is 0.5 m; the liquid-gas ratio of the 10-1 and 10-3 circulating liquid in the wastewater spray layer is 10L / Nm 3 , the coverage rate of wastewater spray layer 10-1 and 10-3 is 200%, the pH of desulfurization slurry is 5.30; The vertical flow velocity of wastewater in the chamber is 0.30mm / s; the SO in the outlet flue gas 2 The concentration is 12.4mg / m 3 , the dust concentration in the outlet flue gas is 2.6mg / m 3 , the purity of de...

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Abstract

The invention relates to the field of resource and environmental protection, in particular to a low-water-consumption wet desulphurization method. A device comprises a desulphurization tower, a desulfurization circulating pump, a desulphurization slurry discharging pump, a gypsum band filtering machine, a liquid filtering pond, a liquid filtering pump, a wastewater treating tower, a clean water pond, a wastewater circulating pump and a humidifying cooling device. Wet desulphurization wastewater is pretreated, the pretreated wastewater is atomized, and then inlet smoke of the wet desulphurization tower is humidified and cooled; evaporation and heat exchanging are carried out between the desulphurization wastewater and high-temperature raw smoke to achieve decrement concentration, the treating amount and the treating cost of the wet desulphurization wastewater are reduced, the moisture volatilization amount in the desulphurization tower is reduced, and low-water-consumption running of the wet desulphurization system is achieved. Contaminants such as HCl, HF and particulate matter in smoke are simultaneously removed in the smoke humidifying process, the chloride ion concentration in desulphurization tower slurry is reduced, the gypsum purity in the desulphurization slurry is improved, and the additional value of desulphurization by products is improved.

Description

technical field [0001] The invention relates to the field of resources and environmental protection, in particular to a low water consumption wet desulfurization method. Background technique [0002] my country's air pollution is mainly caused by a large amount of SO produced during the combustion of coal and fossil fuels. 2 , NO X , HCl, HF, particulate matter and other pollutants are discharged into the atmosphere. In order to control the environmental pollution caused by the combustion of coal and petrochemical fuels, coal-fired units are equipped with desulfurization and denitrification devices to control the emission of pollutants. At present, more than 90% of coal-fired flue gas has adopted limestone-gypsum wet flue gas desulfurization technology. Reverse contact between high-temperature coal-fired flue gas and wet calcium-based circulating slurry to realize SO in flue gas 2 , NO X , HCl, HF, particulate matter and other pollutants are removed. At the same time, th...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/68B01D53/50B01D47/06
CPCB01D47/06B01D53/50B01D53/68B01D53/78
Inventor 刘伟蒋红黄超杨志国戚江平孙陟沈德军王力飞秦乐陈晓雨
Owner 新疆天富集团有限责任公司
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