Flue gas desulphurization method and apparatus

A flue gas and desulfurization tower technology, applied in the field of flue gas desulfurization and production of sulfuric acid, can solve the problems of difficult separation, high operating costs, ozone consumption and power consumption, etc., to prevent loss, avoid secondary pollution, increase The effect of gas-liquid mass transfer effect

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology consumes a lot of ozone and electricity, and the operating cost is high, and both sulfuric acid and nitric acid are strong acids, which are difficult to separate.

Method used

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  • Flue gas desulphurization method and apparatus
  • Flue gas desulphurization method and apparatus
  • Flue gas desulphurization method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The flue gas composition of a catalytic cracking catalyst regenerated is shown in Table 1.

[0037] Table 1 Composition of flue gas regenerated from a catalytic cracking catalyst

[0038]

[0039] Operating conditions: (1) The dust removal and desulfurization tower adopts two-stage dust removal: the pre-dust removal quenching unit is spraying; the deep dust removal unit is filled with fillers; the operating liquid-gas ratio is 3.0L (absorbent) / m 3 (gas) and 4.0 L (absorbent) / m 3 (gas); (2) The absorption liquid of the desulfurization unit is ferric sulfate solution, in which Fe 3+ The mass concentration is 3.0%, the primary / secondary / tertiary circulation desulfurization adopts the spray method, and the liquid-gas ratio is 3.0 L (absorbent) / m 3 (gas); (3) The pH of the absorption liquid in the liquid holding tank at the bottom of the dust removal and desulfurization tower is 1.0~2.0; (4) There are two absorption liquid regeneration towers, which are equipped with co...

Embodiment 2

[0042] The flue gas composition of adsorbent regeneration in a S zorb unit is shown in Table 2.

[0043] Table 2 Composition of flue gas from adsorbent regeneration in a certain S-zorb device

[0044]

[0045] Operating conditions: (1) The pre-dust removal quenching unit is sprayed; the deep dust removal unit is filled with fillers; the operating liquid-gas ratio is 3.0L (absorbent) / m 3 (gas); (2) The desulfurization unit is 4-stage absorption, and the absorption liquid is ferric sulfate and H 2 o 2 The mixed solution, where Fe 3+ Mass concentration 3.0%, H 2 o 2 The mass concentration is 1.5%, all of which are sprayed, and the liquid-gas ratio is 4.0 L (absorbent) / m 3 (gas); (3) The pH of the absorption liquid in the liquid holding tank at the bottom of the dust removal and desulfurization tower is 1.0 to 2.0; (4) There are two absorption liquid regeneration towers, switching operation, and the commercially available D003 type hydrogen-type strong acid cation exchange...

Embodiment 3

[0048] The flue gas composition of a coal-fired boiler is shown in Table 3.

[0049] Table 3 Flue gas composition of a coal-fired boiler

[0050]

[0051] Operating conditions: (1) The pre-dust removal quenching unit is spraying; the deep dust removal unit is filled with fillers; the operating liquid-gas ratio is 4.0L (absorbent) / m 3 (gas) and 3.0L (absorbent) / m 3 (gas); (2) The desulfurization unit is three-stage absorption, and the absorption liquid is ferric sulfate and H 2 o 2 The mixed solution, where Fe 3+ Mass concentration 3.0%, H 2 o 2 The mass concentration is 0.5%, all adopt the spray method, and the liquid-gas ratio is 3.0 L (absorbent) / m 3 (gas); (3) pH 1.0-2.0 of the absorption liquid in the liquid holding tank at the bottom of the dust removal and desulfurization tower; (4) There are two absorption liquid regeneration towers, switching operation, with commercially available 732# hydrogen-type strong acid styrene-based cation exchange resin inside .

...

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Abstract

The invention relates to a flue gas desulphurization method and apparatus. The method comprises the following steps: after the flue gas is heat exchanged by virtue of a flue gas / sulfuric acid heat exchanger, enabling the flue gas to enter a dust collection desulphurization tower, then enabling the flue gas to successively pass through a pre-dust-collection sudden chilling unit, a further dust removal unit, a desulphurization unit and a mist removal unit from bottom to top, absorbing SO2 in the flue gas, converting the SO2 into the sulfuric acid, and obtaining a rich absorption solution; discharging the flue gas purified by the unit into atmosphere; and enabling a rich absorption solution to enter an absorption solution regeneration tower, removing soluble transitional metal ions, then discharging the solution into a sulfuric acid storage tank, spraying, heat exchanging and concentrating by virtue of the flue gas / sulfuric acid heat exchanger, and then transporting the product. By adopting the method and apparatus, SO2 in the flue gas can be directly oxidized and converted into sulfuric acid; and the sulfuric acid solution with high concentration can be prepared by virtue of the concentration, the purified flue gas can meet the requirements of relevant national or local standard stipulations, and the flue gas desulphurization method and apparatus are suitable for recovering fluegas comprising the sulfur dioxide with various concentrations.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method and a device for flue gas desulfurization and sulfuric acid production. Background technique [0002] Since 2003, my country's SO 2 The total emissions have remained high. In 2014, my country's SO 2 The total emissions were 19.744 million tons, which was below 20 million tons for the first time since 2003. Although the goal of reducing sulfur dioxide by 10% during the "Eleventh Five-Year Plan" period in my country has been achieved, the current acid rain pollution area in China (accounting for 30% of the country's land area) is still expanding, and is changing from "sulfuric acid type" to "sulfuric acid nitric acid compound type" " Transformation. Each year due to acid rain and SO 2 Pollution has caused economic losses of more than 100 billion yuan in crops, forests and human health, and the control of sulfur dioxide emissions cannot be ig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D51/00B01D50/00B01D53/50B01D53/80B01D46/30C02F1/00C02F103/18
CPCB01D46/30B01D50/00B01D51/00B01D53/507B01D53/80B01D2251/608B01D2258/0283C02F1/001C02F2103/18C02F2301/08
Inventor 王明星王昊辰阮宗琳王岩姜阳
Owner CHINA PETROLEUM & CHEM CORP
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