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Device and method for redesulfuration with desulfurization ash

A desulfurization ash and absorption device technology, which is applied in chemical instruments and methods, separation methods, and solid waste removal, etc., can solve the problems of simplicity, insufficient utilization, and complex pulping systems.

Inactive Publication Date: 2015-10-07
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pulping system is complicated, and the cyclone separation efficiency and oxidation efficiency are low
[0006] Although the above methods are used for wet flue gas desulfurization with desulfurization ash, the pulping system is too complicated, or the subsequent treatment is too simple, which may easily cause secondary pollution, or the consumption of desulfurization ash is small, so it cannot be fully utilized

Method used

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  • Device and method for redesulfuration with desulfurization ash
  • Device and method for redesulfuration with desulfurization ash
  • Device and method for redesulfuration with desulfurization ash

Examples

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Effect test

Embodiment 1

[0079] A power plant, 2×300MW unit flue gas desulfurization project, uses semi-dry desulfurization ash as desulfurization agent, the effective calcium content in the desulfurization ash is 26.1%, the ash content is 18%, and the concentration of the desulfurization ash slurry in the slurry tank is 32%. Using desulfurization ash slurry as desulfurization absorbent to adjust SO 2 The pH value in the absorption device is 5.6, the solid content of the slurry is 20%, when the sulfur dioxide concentration in the imported flue gas is 1970mg / m 3 , the wet base standard flue gas flow rate is 1.286 million Nm 3 / h, the concentration of sulfur dioxide at the outlet is 34mg / m 3 Below, the desulfurization efficiency reaches over 98.3%; adjust the pH value in the oxidation device to 4.8, and the oxidation rate of calcium sulfite reaches 97%; after passing through the ash separation device, the purity of gypsum reaches over 95%. The entire desulfurization system operates stably, and the con...

Embodiment 2

[0081] A power plant with semi-dry desulfurization process, 2×410t / h unit flue gas desulfurization project, using internal semi-dry desulfurization ash as desulfurization agent, desulfurization ash with effective calcium content of 30.7%, ash content of 15%, slurry The concentration of desulfurization ash slurry in the pond is 28%. Using desulfurization ash slurry as desulfurization absorbent to adjust SO 2 The pH value in the absorption device is 5.5, the solid content of the slurry is 20%, when the sulfur dioxide concentration in the imported flue gas is 1495mg / m 3 , the wet base standard flue gas flow rate is 986,000 Nm 3 / h, the concentration of sulfur dioxide at the outlet is 17mg / m 3 Below, the desulfurization efficiency is above 98.9%; adjust the pH value in the oxidation device to 4.8, and the oxidation rate of calcium sulfite reaches 99%; after passing through the ash separation device, the purity of gypsum reaches above 97.8%. The entire desulfurization system ope...

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Abstract

The invention discloses a device and method for redesulfuration with desulfurization ash. The device comprises a desulfurization ash slurrying device, a SO2 absorbing device, an oxidation device, an ash content separating device, a gypsum dehydration device and a wastewater treatment device which are connected in sequence. The desulfurization ash slurrying device comprises a desulfurization ash powder bin provided with a fluidizing air inlet in the lower portion, a vibrator inside, and a dedusting device on the top, and a slurry melting pond connected with the desulfurization ash powder bin and the SO2 absorbing device. The ash content separating device comprises a tank body and multiple layers of baffles, wherein a first slurry liquid outlet is formed in the upper portion of the tank body, a slurry liquid inlet and a second slurry liquid outlet are formed in the bottom of the tank body, and the baffles are horizontally arranged in the tank body and located between the slurry liquid inlet and the first slurry liquid outlet. A desulfurization system is designed according to the characteristics of desulfurization ash, and wet flue gas desulfurization is conducted with desulfurization ash completely, so that desulfurization efficiency is guaranteed and gypsum quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a wet flue gas desulfurization device and method using desulfurization ash for re-desulfurization. Background technique [0002] Desulfurization ash contains a lot of CaSO 3 And f-CaO, which has the ability to absorb sulfur dioxide, can be reused as a desulfurization absorbent. [0003] The Chinese invention patent document with the application number 02135437.5 discloses a method of desulfurizing the waste ash milk after semi-dry flue gas desulfurization. In the absorption tower, the flue gas and seawater waste ash milk are in reverse contact to absorb the Sulfur dioxide, to achieve the purpose of treating waste with waste. It has the advantages of high desulfurization rate, low investment and low operating cost. However, this method is too simple, reduces the post-treatment process of the effluent, and easily causes secondary pollution, and the absorption to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B09B3/00C01F11/46
Inventor 莫建松夏纯洁刘兴利程常杰李海涛
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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