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Device and method for combined treatment of flue gas and zero discharge of wastewater

A combined treatment and zero discharge technology, applied in water supply equipment, water supply equipment, gas treatment, etc., can solve problems such as difficult to meet discharge standards, difficult to treat F- ions, and waste water discharge, and achieve reduced renovation project costs, low cost, and Avoid the effects of ammonia slip

Pending Publication Date: 2022-05-17
SHANDONG GUOSHUN CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a process will inevitably produce waste water discharge
If the amount of fluorine (HF) in the original flue gas is high, the F- ions in the wastewater are difficult to treat and it is difficult to meet the discharge standard

Method used

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  • Device and method for combined treatment of flue gas and zero discharge of wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Wet desulfurization: It is a desulfurization process with a wet desulfurization tower, such as limestone / lime-gypsum desulfurization process, magnesium desulfurization process, ammonia desulfurization process, and sodium-alkali desulfurization process; this process uses wet desulfurization The tower is the core equipment, which is equipped with a spray layer to spray the circulating slurry evenly and cover the section of the wet desulfurization tower from above to ensure the desulfurization efficiency; it is also equipped with a demister to intercept particulate matter and slurry mist in the flue gas The drop devices are divided into flat plate demisters, roof demisters and tube demisters. The flue gas treated by the wet desulfurization process is saturated wet flue gas, the moisture content is controlled within the range of 10-20%, the temperature is controlled within the range of 45-65°C, and the SO 2 The content is reduced by 90-98%, and the content of HF and HCl is ...

Embodiment 2

[0043] Wet desulfurization process section: the raw flue gas enters the wet desulfurization tower (1), flows from bottom to top under the action of the circulating slurry pump group (2), and forms an inversion with the circulating slurry sprayed from the multi-layer spray layer (3). contact with each other, and pass through the multi-stage demister (4) at the same time, and discharge to the top outlet of the wet desulfurization tower.

[0044] Wherein, the original flue gas is connected with the entrance of the wet desulfurization tower of the present invention;

[0045] Wherein, the saturated wet flue gas is connected with the outlet of the wet desulfurization tower of the present invention;

[0046] GGH+SCR denitrification process section: the saturated wet flue gas at the top outlet of the wet desulfurization tower enters the gas-gas heat exchanger (10), exchanges heat with the hot flue gas, and then passes through the gas heating device (11) and the ammonia injection devic...

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Abstract

The invention relates to a flue gas combined treatment and wastewater zero discharge device and method, and the method comprises the following steps: 1) carrying out wet desulphurization on flue gas, dissolving most of acid gases such as SO2, HF, HCl and the like in the flue gas in a circulating spray liquid, and generating a small amount of desulfurization wastewater; 2) carrying out heat exchange on the flue gas subjected to wet desulfurization to increase the temperature of the flue gas, and introducing the flue gas into an SCR (Selective Catalytic Reduction) denitration method to enable nitrogen oxides in the flue gas to generate N2 and H2O through a denitration reaction; and 3) finally spraying desulfurization wastewater fog drops into the flue gas subjected to denitration treatment, carrying out semi-dry desulfurization on the flue gas, carrying out desulfurization reaction on sulfur dioxide in the flue gas to generate solid byproducts, and attaching Cl <-> and F <-> salts in the desulfurization wastewater to the surfaces of the solid byproducts, so that the problem of zero emission of the desulfurization wastewater is solved; meanwhile, the problem that F <-> ions in the wastewater are difficult to reach the discharge standard is solved.

Description

technical field [0001] The invention belongs to the technical field of flue gas separation and treatment, and in particular relates to a device and method for combined flue gas treatment and zero discharge of waste water. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In the current field of air treatment and environmental protection, when treating waste gas with complex pollutant components, treatment processes such as desulfurization, denitrification, defluorination, and dust removal often cannot be integrated. 3 ) flue gas, wet desulfurization and SCR process are often used to achieve desulfurization, denitrification and dust removal. Among them, wet desulfurization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14B01D53/86B01D53/56B01D53/80B01D53/75B01D53/76B01D46/02C02F1/28E03B1/04C02F101/12C02F101/14C02F103/18
CPCB01D53/18B01D53/1456B01D53/1481B01D53/8628B01D53/80B01D53/75B01D53/76B01D46/02C02F1/281E03B1/042C02F2103/18B01D2257/302B01D2257/2045B01D2257/2047B01D2258/0283B01D2251/2062C02F2101/12C02F2101/14Y02A50/20
Inventor 杨凤岭范贤平刘述平吕扬孙德山卢忠阳尹鹏仇洪波李智洋管闯杨怀锋吕和武冯超董如鑫王义富
Owner SHANDONG GUOSHUN CONSTR GRP