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A double-alkali flue gas desulfurization process

A desulfurization process and double-alkali technology, which is applied in the field of double-alkali flue gas desulfurization technology, can solve the problems of large area occupied by regeneration tanks and clarifiers, reduced stability, increased operating costs, etc.

Inactive Publication Date: 2011-12-21
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] CN1475298A invented a flue gas desulfurization process of concentrated alkali double alkali method, which solved the problem that the regeneration tank and clarification tank occupied too much area in the original dilute alkali double alkali method, and improved the desulfurization efficiency at the same time
In this patent, the forced oxidation process is carried out three times, and the cycle is kept at a high pH value, which increases the operating cost and reduces the stability of the operation.

Method used

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  • A double-alkali flue gas desulfurization process
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  • A double-alkali flue gas desulfurization process

Examples

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Effect test

Embodiment 1

[0046] The imported flue gas volume is 100000Nm 3 / h (standard cubic meter / hour), flue gas temperature is 100°C, SO 2 The concentration is 1500mg / m 3 , the flue gas enters the water absorption tower, and the liquid-gas ratio of the water absorption tower is controlled at 2L / m 3 , the pH value of the outlet solution is controlled at 2.5. The flue gas enters the alkali absorption tower (using caustic soda solution as the absorbent) from the water absorption tower, and the liquid-gas ratio of the alkali absorption tower is controlled at 2L / m 3 , the pH value of the outlet desulfurization liquid is controlled at 7.0, and the sodium salt content is controlled at 10%. SO in flue gas at the outlet of alkali absorption tower 2 The concentration is 40mg / m 3 .

[0047] The desulfurization liquid enters the regeneration system, the lime milk concentration is controlled at 12%, the stirring speed in the regeneration tank is 200rpm, the regeneration reaction time is controlled at 1.5...

Embodiment 2

[0050] The imported flue gas volume is 150000Nm 3 / h, flue gas temperature is 100℃, SO 2 The concentration is 2000mg / m 3 , the flue gas enters the water absorption tower, and the liquid-gas ratio of the water absorption tower is controlled at 3L / m 3 , the pH value of the outlet solution is controlled at 2.5. The flue gas enters the alkali absorption tower (using caustic soda solution as the absorbent) from the water absorption tower, and the liquid-gas ratio of the alkali absorption tower is controlled at 3L / m 3 , the pH value of the outlet desulfurization liquid is controlled at 6.5, and the sodium salt content is controlled at 12%. SO in flue gas at the outlet of alkali absorption tower 2 The concentration is 100mg / m 3 .

[0051] The desulfurization liquid enters the regeneration system, the concentration of milk of lime is controlled at 8%, the stirring speed in the regeneration tank is 200rpm, the regeneration reaction is controlled at 1h, and the regeneration liquid...

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Abstract

The present invention relates to a double-alkali flue gas desulfurization process, including a flue gas absorption system, an alkali regeneration system, and a gypsum preparation system, wherein: a, the flue gas absorption system includes two parts: water absorption and alkali absorption, and sulfur-containing flue gas passes through water Absorb part of the SO2 to obtain H2SO3 solution and part of the desulfurized flue gas, and the part of the desulfurized flue gas after demisting is subjected to alkali absorption to obtain the absorption liquid and desulfurization flue gas; b. The alkali regeneration system includes regenerating the absorption liquid with lime to generate calcium sulfite and calcium sulfate precipitate, separate the precipitate to obtain a regeneration solution, and return the regeneration solution to the alkali absorption part in the absorption system; c, the gypsum preparation system includes using the H2SO3 solution obtained by absorbing water in a to acidify the precipitate obtained in b, and at the same time Oxygen-containing gas is blown in to oxidize. After oxidation, a slurry containing calcium sulfate is obtained. After conventional treatment, the slurry is obtained into gypsum and clear liquid. The invention utilizes the H2SO3 solution formed after the water absorbs the flue gas as the acidifying acid of the oxidation system, reduces the amount of added sulfuric acid, and makes reasonable use of the sulfur-containing flue gas.

Description

technical field [0001] The invention relates to a flue gas desulfurization process, in particular to a double-alkali flue gas desulfurization process. Background technique [0002] In recent years, my country has intensified the control of air pollution, implemented stricter air pollution emission standards, and made great progress in flue gas desulfurization technology. Wet desulfurization is currently the most widely used desulfurization technology in the world. In the wet process, the wet calcium method occupies an absolute dominant position. Wherein the limestone (lime)-gypsum method has the problem of fouling and blockage of equipment, therefore, a sodium-calcium double alkali method has been developed. The double alkali method has the following advantages: [0003] (1) Sodium hydroxide or sodium carbonate is used for desulfurization. The circulating water is basically an aqueous solution of sodium hydroxide and sodium salt. During the circulation process, there is n...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50C04B11/26
Inventor 华炜马程华姜琳赵西明凌峻郦和生宫振宇王岽秦会敏吴颖杨玉窦晓春袁素梅
Owner CHINA PETROLEUM & CHEM CORP
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