Technology for removing SO2 in smoke through recovery method

A technology of SO2 and desulfurization process, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as failure to realize resource recycling, complex process flow, and large consumption of desulfurization agents, etc., to achieve stable operation, Low energy consumption and low operating costs

Inactive Publication Date: 2013-07-17
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is complicated, and the desulfurizer is used once
SO in flue gas 2 The gaseous pollutants are converted into calcium sulfite or calcium sulfate by desulfurization and fixed, but the desulfurization product gypsum has no market due to quality problems, and most of them are discarded, resulting in secondary pollution
Therefore, these processes on the one hand do not achieve SO 2 Recycling of resources, on the other hand, the desulfurization process consumes a large amount of desulfurization agent, resulting in secondary pollution, high desulfurization cost, and does not really achieve the purpose of clean production

Method used

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  • Technology for removing SO2 in smoke through recovery method

Examples

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Embodiment example 1

[0022] The absorption reaction technological process of present embodiment is as figure 1 shown. The desulfurization tower (1) is a spray tower with a diameter of 200mm, and the desulfurization tower (2) is a 50L magnetically stirred tank type desorption tower. The flue gas enters the desulfurization tower from inlet A at the lower part of the desulfurization tower (1), and contacts with the zinc sulfite slurry sent into the desulfurization tower by a circulating pump to complete SO 2 Absorption, the rich liquid is discharged from the lower part of the desulfurization tower into the slurry pool (4). When the desulfurizer is consumed to a certain extent, the rich liquid is split and sent to the desorption tower (2) for SO 2 Analysis and absorbent regeneration. Flue gas without dust, the flow rate is 300m 3 / h,SO 2 The concentration is 2000mg / m 3 , oxygen content 5%. At a temperature of 20°C and a liquid-to-gas ratio of 12 in the desulfurization tower, after treatment wit...

Embodiment example 2

[0024] SO in flue gas 2 The concentration is 8000mg / m 3 , using the same process as Case 1, after being treated with a zinc sulfite solution with a concentration of 18% in the absorbing fluid of the desulfurization tower, the SO in the purified gas 2 The content is 700mg / m 3 , the desulfurization efficiency is up to 92%. After heating in the desorption tower at 60°C for 1 hour, more than 92% of the zinc sulfite in the rich liquid is regenerated, and the SO in the regeneration gas 2 The content is 95%, and the regeneration recovery rate of zinc sulfite in the absorption liquid reaches 92%.

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Abstract

The invention discloses a technology for removing SO2 in a smoke through a recovery method. Zinc sulfite reacts with SO2 in the smoke in an aqueous solution in a desulfurization tower as a desulfurization agent to generate a soluble zinc salt in order to absorb SO2 in the smoke and purify the smoke. A rich solution after SO2 absorption is heated to generate ZnSO3 and release SO2. The regenerated ZnSO3 is reused for the SO2 absorption, and released SO2 is trapped and recovered, and is used for producing sulfuric acid or an industrial SO2 gas in order to realize resource recovery.

Description

technical field [0001] The invention relates to the technical field of removing sulfur dioxide in flue gas, in particular to a wet desulfurization process using zinc sulfite as a desulfurizing agent to absorb sulfur dioxide in flue gas. Background technique [0002] SO in the atmosphere 2 Gas and the acid deposition it forms are one of the major environmental problems facing mankind today. It is urgent to reduce sulfur dioxide emissions and protect the environment. For a long time, human beings have made unremitting efforts to reduce the emission of these toxic gases. The country has also formulated relevant policies and flue gas emission standards for atmospheric environment control, among which flue gas SO 2 The emission standards are also strictly regulated. Flue gas desulfurization technology can be generally divided into two categories: disposal method and recovery method. At present, the most widely used flue gas desulfurization technology is the limestone-gypsum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 童华杨姝
Owner BEIJING UNIV OF CHEM TECH
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