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Device and method for removing sulfur dioxide in smoke by two-step alkalifying reproducing and sodium sulfite method

A technology of sodium sulfite and sulfur dioxide, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., to achieve the effects of simple and reliable process, high desulfurization rate, and high promotion value

Inactive Publication Date: 2014-08-13
陕西华锐迪橡胶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0055] The main problem of the existing sodium sulfite desulfurization technology: the desulfurization rate of the existing technology is slightly higher than 90%, and there is still a lot of room for improvement

Method used

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  • Device and method for removing sulfur dioxide in smoke by two-step alkalifying reproducing and sodium sulfite method

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Experimental program
Comparison scheme
Effect test

Embodiment １

[0078] refer to figure 1 As shown, a two-step alkali addition regenerates sodium sulfite and removes sulfur dioxide in the flue gas device, the device consists of a filter press, a washing pump, a chimney, an absorption tower, a washing tower, a washing liquid tank, a first regenerator, a first mixing device, main absorption pump, feed pump, thickener, centrifuge, mother liquor tank, mother liquor pump, second regenerator, second mixer, fine absorption pump and filter feed pump, the device includes two-stage countercurrent absorption Unit and absorption liquid two-step alkali regeneration unit, wherein, the two-stage countercurrent absorption unit consists of a chimney 3, an absorption tower 4, a washing tower 5, a washing liquid tank 6, a washing pump 2, a filter press 1, and a main absorption pump 9 , a fine absorption pump 17 and a filter feed pump 18; the two-step alkali regeneration unit for the absorption liquid consists of a first regenerator 7, a first mixer 8, a feed...

Embodiment ２

[0080] A kind of method for removing sulfur dioxide in the flue gas is carried out according to the following steps:

[0081] 1) The flue gas containing sulfur dioxide and soot from outside the device enters the washing tower 5 and contacts with the spray washing liquid from the washing pump 2 to wash dust and cool down, and then enters the absorption tower 4 from the bottom at a temperature of 55-65°C to flow upwards, The internal space of the absorption tower 4 is in full contact with the circulating absorption liquid sent in by the main absorption pump 9 and the regenerated absorption liquid sent in by the fine absorption pump 17 in turn, and the sulfur dioxide in the flue gas reacts with the sodium sulfite in the recirculated absorption liquid and the regenerated absorption liquid Generate sodium bisulfite and be removed, and the net flue gas after removing sulfur dioxide enters the chimney 3 from the top of the absorption tower 4 to be emptied;

[0082] 2) The washing liq...

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Abstract

The invention discloses a device and method for removing sulfur dioxide in smoke by the two-step alkalifying reproducing and sodium sulfite method, and aims at overcoming the shortages of an existing sodium-sulfite-method desulfurization technology. The method is characterized in that a reproducing unit performs reproduction in two steps; an absorbing unit is used for absorbing sulfur dioxide from the smoke twice with absorbing solutions composed of different components, wherein in the first reproduction step, most of sodium hydrogen sulfite is removed to obtain a sodium sulfite crystal, and in the second reproduction step, all sodium hydrogen sulfite is removed to obtain a pure sodium sulfite solution with high absorbing capacity; the mixing solution of sodium sulfite and sodium hydrogen sulfite is used to absorb in a main absorbing stage; in a fine absorbing stage, the pure solution, with high absorbing capability, which is obtained by reproducing is used to continuously desulfurize the smoke desulfurized in the main absorbing stage so that the content of sulfur dioxide in the clean smoke is reduced to be less than 40mg / m<3>. According to the device and method, the balance among the investment, desulfurization degree, operation economy and reliability is ensured, so that compared with a calcium-method desulfurization technology and a ammonia-method desulfurization technology, the method according to the invention has the advantage that the lower cost and higher desulfurization degree can be realized; the device and the method can be widely applied to thermal power plants, metallurgy, building materials and industrial furnaces.

Description

technical field [0001] The invention relates to industries such as chemical industry, thermoelectricity, metallurgy and building materials, and in particular relates to a device and method for removing sulfur dioxide from flue gas by two-step alkali addition and regeneration of sodium sulfite. Background technique [0002] Principles of various existing flue gas desulfurization technologies: [0003] Sodium sulfite method [0004] Sodium sulfite absorption desulfurization technology is divided into two types of processes: heating regeneration and alkali addition regeneration according to the regeneration method of absorbing rich liquid. The heating regeneration process obtains sulfur dioxide gas during absorption of rich liquid regeneration, which can be further processed into sulfuric acid, sulfur or other products with higher value. It has the disadvantages of complicated process and high regeneration energy consumption, and is only suitable for comprehensive utilization ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 李蒙
Owner 陕西华锐迪橡胶科技有限公司
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