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Concentrated alkali double alkali method stack gas desulfurizing technology

A desulfurization process and double-alkali technology, which is applied in the environmental field, can solve the problems of large area occupied by regeneration tanks and clarification tanks, and achieve the effects of reducing liquid-gas ratio, high desulfurization efficiency, and reducing operating costs

Inactive Publication Date: 2004-02-18
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a flue gas desulfurization process of concentrated alkali double alkali method, which solves the problem that the regeneration tank and clarification tank occupy too much area in the original dilute alkali double alkali method, and at the same time improves the desulfurization efficiency

Method used

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  • Concentrated alkali double alkali method stack gas desulfurizing technology
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  • Concentrated alkali double alkali method stack gas desulfurizing technology

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Effect test

Embodiment 1

[0034] At a flue gas temperature of 130°C, the inlet flue gas SO 2 The concentration is 1500mg / m 3 , the sodium ion concentration of the absorption liquid is 0.3mol / L, pH=7.0, L / G=3.0L / m 3 , the reflux ratio is 10%, the pH value in the regeneration tank is controlled at 9, the calcium ion concentration of the clarified liquid is 50mg / L, and the clarified liquid is mixed with the absorption liquid at the bottom of the absorption tower 2 when it is refluxed. After the whole system is running, the flue gas desulfurization efficiency up to 90%.

Embodiment 2

[0036] At a flue gas temperature of 130°C, the inlet flue gas SO 2 The concentration is 1000mg / m 3 , the sodium ion concentration of the absorption solution is 2mol / L, pH=9.0, L / G=8.0L / m 3, the reflux ratio is 25%, the pH value in the regeneration tank is controlled at 13, the calcium ion concentration of the clarified liquid is 100mg / L, the clarified liquid is sent back to the absorption tower 2, and directly enters the circulation. After the whole system is running, the flue gas desulfurization efficiency is 98%.

Embodiment 3

[0038] At a flue gas temperature of 130°C, the inlet flue gas SO 2 The concentration is 3000mg / m 3 , the sodium ion concentration of the absorption solution is 0.3mol / L, pH=6.0, L / G=1.0L / m 3 , the reflux ratio is 5%, the pH value in the regeneration tank is controlled at 11, the calcium ion concentration of the clarified liquid is 500 mg / L, and the clarified liquid is mixed with the absorption liquid at the bottom of the absorption tower 2 when the clarified liquid is refluxed. After the operation of the whole system, the flue gas desulfurization efficiency 75%.

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Abstract

A process for desulfurizing fume by concentrated alkali dual-alkali method features that the SO2 is absorbed by absorbing liquid in absorption tower, the most of absorbing liquid is circulated for absorbing SO2 cyclically, a small part of it is regenerated in regenerating pool for reusing it while generating calcium sulfite and calcium sulfate to be treated further. Its advantages are less possesses ground area and high desulfurizing efficiency up to 95% or more.

Description

technical field [0001] The invention relates to the field of environmental technology, and belongs to the direction of air pollution control and treatment, in particular to a double-alkali flue gas desulfurization process. Background technique [0002] Flue gas desulfurization has a long history, and research in this area was carried out as early as more than one hundred years ago. At present, desulfurization technology can be summarized into three categories: (1) desulfurization before combustion, such as coal washing, microbial desulfurization; (2) desulfurization during combustion, such as industrial briquette sulfur fixation, calcium injection in the furnace; Desulfurization, namely flue gas desulfurization (FGD). FGD technology is the only large-scale commercial application of desulfurization technology in the world. FGD technology mainly uses absorbent or adsorbent to remove SO in flue gas 2 , and transform it into a more stable sulfur compound. There are many type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78
Inventor 吴忠标莫建松程常杰王毅官宝红
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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