Method for removing SO2 and NOX from flue gas of coal-fired boiler by virtue of phosphoric ore pulp and phosphorus sludge

A technology for coal-fired boilers and phosphate rock slurry, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems that nitrogen and sulfur cannot be effectively used, and achieve the effects of saving preparation processes, causing large pollution, and promoting transformation

Active Publication Date: 2016-05-04
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of segmental desulfurization and denitrification existing in the prior art, and the problem that nitrogen and sulfur cannot be effectively utilized economically, and proposes a method for removing SO in flue gas of coal-fired boilers by using phosphate slurry and sludge phosphorus. 2 and NO X method, enabling simultaneous and efficient removal of SO in one unit 2 and NO x

Method used

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  • Method for removing SO2 and NOX from flue gas of coal-fired boiler by virtue of phosphoric ore pulp and phosphorus sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the coal-fired boiler containing SO 2 2000mg / m 3 , NO x 200mg / m 3 The flue gas enters the power wave oxidation tower 1 from top to bottom, and oxidizes the liquid at a temperature of 50°C (water turbid liquid containing mud phosphorus, and the mud phosphorus from the yellow phosphorus workshop passes through the primary circulation tank 5 and then passes into the oxidation tower) Countercurrent contact, control the elemental phosphorus content in the oxidation solution to 5g / L, the gas velocity to 35m / s, and the liquid-to-gas ratio to 7L / m 3 , in the oxidation tower, most of NO is oxidized to NO which is easily soluble in water 2 , and then enter the first-level absorption tower 2 (empty tower) with three layers of nozzles. In the first-level absorption tower 2, the flue gas is in countercurrent contact with the phosphate slurry from bottom to top (the phosphate slurry comes from the grinding workshop of the phosphate chemical plant area ...

Embodiment 2

[0031] Such as figure 1 As shown, the coal-fired boiler containing SO 2 3000mg / m 3 , NO x 300mg / m 3 The flue gas enters the power wave oxidation tower 1 from top to bottom, and contacts with the oxidizing liquid (water turbid liquid containing mud phosphorus) at a temperature of 60°C countercurrently. The content of elemental phosphorus in the oxidizing liquid is controlled to 10g / L, and the gas velocity is 35m / s, liquid-gas ratio 7L / m 3 , in the oxidation tower, most of NO is oxidized to NO which is easily soluble in water 2 , and then enter the kinetic wave primary absorption tower 2 with a layer of nozzles. In the primary absorption tower 2, the flue gas is in countercurrent contact with the phosphate slurry from the secondary absorption tower 3 from top to bottom (phosphorus The solid content of pulp is controlled at 40%, pH=6), 60%~70% SO 2 , NO x It is absorbed in the primary absorption tower 2, and the rest enters the secondary absorption tower 3 (empty tower wi...

Embodiment 3

[0034] Containing SO from coal-fired boilers 2 6000mg / m 3 , NO x 500mg / m 3 The flue gas enters the dynamic wave oxidation tower from top to bottom, and contacts with the oxidizing liquid (mixed slurry containing mud phosphorus and phosphate slurry) at a temperature of 70°C countercurrently. The content of elemental phosphorus in the oxidizing liquid is controlled to 15g / L, and the gas velocity is 20m / s, liquid-gas ratio 7L / m 3 , in the oxidation tower, most of NO is oxidized to NO which is easily soluble in water 2 , and then enter the kinetic wave primary absorption tower with 2 layers of nozzles. In the primary absorption tower, the flue gas is in countercurrent contact with the phosphate slurry from the secondary absorption tower 3 from top to bottom (phosphate slurry Solid content is controlled at 35%, pH=5.5), 70% to 80% SO 2 , NO x It is absorbed in the first-level absorption tower, and the rest enters the second-level absorption tower (empty tower with 2 layers o...

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Abstract

The invention discloses a method for removing SO2 and NOX from flue gas of a coal-fired boiler by virtue of phosphoric ore pulp and phosphorus sludge. The method comprises the following steps of causing the flue gas of the coal-fired boiler to enter an oxidation tower containing oxidation liquid to fully contact with the oxidation liquid for reaction, a part of NO being oxidized into NO2, then causing the flue gas to enter an absorption tower, and absorbing nitrogen oxide and sulfide in the flue gas by virtue of the solubility of NO2 and SO2 in water and the catalytic oxidation of transition metal ions of the phosphoric ore pulp to make the nitrogen oxide, sulfur dioxide and dust content of the flue gas far lower than the national emission standard. According to the method, a raw material of a phosphate chemical enterprise is utilized, phosphate chemical and coal-fired boiler production is coupled, no raw materials are required to be added, sulfuric acid formed by SO2 is absorbed directly for decomposing phosphoric acid produced by phosphorus ores, and nitric acid formed by the nitrogen oxide enters a nitrogen and phosphorus compound fertilizer system; the method is high in resource utilization rate and less in investment, and has obvious social and economic benefits, all byproducts are recycled, and no secondary pollutants are produced.

Description

technical field [0001] The invention belongs to the field of industrial waste gas treatment, and relates to a method for removing SO in flue gas of coal-fired boilers by using phosphate rock slurry and mud phosphorus 2 and NO X method. Background technique [0002] my country's coal output accounts for about 49% of the world's total output, and it is the world's largest coal producer and consumer. Among the coal used in my country, 80% of the coal is directly used for combustion, producing a large amount of SO 2 , NO x The emission of these gases causes a series of air pollution problems such as the greenhouse effect, acid rain, and smog, and has a serious impact on the living environment of human beings and organisms. Effective control and reduction of SO generated during coal combustion 2 and NO x , is a serious challenge facing our country. [0003] Desulfurization and denitrification of coal-fired boiler flue gas has always been a research hotspot at home and abroa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/86B01D53/60
CPCB01D53/60B01D53/80B01D53/8637B01D2251/10B01D2257/302B01D2257/404B01D2258/0283Y02A50/20
Inventor 梅毅杨加强王驰罗蜀峰王力刚李凯李国斌张冬冬宁平黄迪徐金泉
Owner KUNMING UNIV OF SCI & TECH
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