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Process for desulphurizing flue gas and producing sulfur dioxide by sodium-zinc method

A technology of sulfur dioxide and flue gas, which is applied in the fields of chemical industry, electric power, building materials and metallurgy. It can solve the problems of desulfurization and scaling and low decomposition temperature, and achieve the effects of reducing scaling and clogging, saving usage and reducing costs.

Active Publication Date: 2011-02-16
TAIYUAN BOILER GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at ZnSO 3 Due to the advantage of lower decomposition temperature, a sodium-zinc method for desulfurization and co-production of SO is proposed 2 advanced technology, so that it can not only effectively avoid the problem of calcium desulfurization and oxidation, but also solve the problem of zinc desulfurization and scaling

Method used

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  • Process for desulphurizing flue gas and producing sulfur dioxide by sodium-zinc method
  • Process for desulphurizing flue gas and producing sulfur dioxide by sodium-zinc method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Feed SO into the desulfurization tower at a flow rate of 1.5L / min 2 The flue gas with a volume fraction of 5% is sprayed with 1.0mol / L Na in the desulfurization tower at a flow rate of 0.4L / min 2 CO 3 solution, in order to ensure that the SO 2 The conversion rate, in the implementation to ensure that the Na passing through the desulfurization tower per minute 2 CO 3 The number of moles is the amount of SO passed into the desulfurization tower 2 more than three times. And at the outlet of the desulfurization tower, use a flue gas analyzer to detect SO in the gas discharged to the atmosphere 2 volume concentration. The flue gas analyzer measures 10 times evenly within 20 minutes, SO 2 The volume concentration is between N.D. and 22ppm, SO 2 The conversion rate is above 99.9%.

[0037] (2) after the product solution in the desulfurization tower is drawn, pass into circulation tank with the flow rate of 0.4L / min, utilize rotary feeder to feed ZnO solid with the...

Embodiment 2

[0041] (1) Feed SO into the desulfurization tower at a flow rate of 0.5L / min 2 The flue gas with a volume fraction of 30% is sprayed with 0.5mol / L Na at a flow rate of 1.5L / min into the desulfurization tower at the same time 2 CO 3 solution, in order to ensure that the SO 2 The conversion rate, in the implementation to ensure that the Na passing through the desulfurization tower per minute 2 CO 3 The number of moles is the amount of SO passed into the desulfurization tower 2 more than three times. And at the outlet of the desulfurization tower, use a flue gas analyzer to detect SO in the gas discharged to the atmosphere 2 volume concentration. The flue gas analyzer measures 10 times evenly within 20 minutes, SO 2 The volume concentration is between 12ppm and 29ppm, SO 2 The conversion rate is above 99.9%.

[0042] (2) After the product solution in the desulfurization tower is drawn, it is passed into the circulation tank with a flow rate of 1.5L / min, and the ZnO solid...

Embodiment 3

[0046] (1) Feed SO into the desulfurization tower at a flow rate of 1.5L / min 2 The flue gas with a volume fraction of 1% is sprayed with 0.1mol / L Na in the desulfurization tower at a flow rate of 1L / min 2 CO 3 solution, in order to ensure that the SO 2 The conversion rate, in the implementation to ensure that the Na passing through the desulfurization tower per minute 2 CO 3 The number of moles is the amount of SO passed into the desulfurization tower 2 more than three times. And at the outlet of the desulfurization tower, use a flue gas analyzer to detect SO in the gas discharged to the atmosphere 2 volume concentration. The flue gas analyzer measures 10 times evenly within 20 minutes, SO 2 The volume concentration is between N.D. and 13ppm, SO 2 The conversion rate is above 99.9%.

[0047] (2) after the product solution in the desulfurization tower is drawn, pass into circulation tank with the flow rate of 0.4L / min, utilize rotary feeder to feed ZnO solid with the s...

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Abstract

The invention relates to a process for desulphurizing flue gas and producing high-concentration sulfur dioxide by a sodium-zinc method, which can be widely used in the technical fields of chemical industry, electric power, construction materials, metallurgy and the like. In the invention, a sodium sulfite solution is used for absorbing sulfur dioxide in the flue gas, zinc oxide is used for realizing the concentration and the purification of the sulfur dioxide, and a thermal decomposition method is used to obtain the sulfur dioxide product. The invention avoids the problem that calcium sulfate produced by calcium-method desulphurization is difficult to use, solves the problem on scaling in zinc-method desulphurization, and effectively saves the flue gas desulphurization cost, thereby having good application prospects.

Description

technical field [0001] The invention relates to a process for sodium-zinc method flue gas desulfurization and co-production of sulfur dioxide, which can be widely used in technical fields such as chemical industry, electric power, building materials and metallurgy. Background technique [0002] SO 2 It is one of the main air pollutants. In my country, the waste flue gas of coal-fired power plants, chemical plants, metal smelters and building materials plants is the main source of SO in the air. 2 main source of . Flue gas desulfurization and SO by using desulfurizer 2 Concentration and purification of condensate has become an urgent problem to be solved in our country. [0003] According to the dry and wet state of the desulfurizer, flue gas desulfurization technology can be divided into wet method, semi-dry method and dry method. From the types of metal elements in the desulfurizer, flue gas desulfurization technology can be divided into calcium method (CaO / Ca(OH) 2 )...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/96B01D53/50C01B17/50
Inventor 张扬王涛张海张绪祎杨海瑞刘青吕俊复岳光溪
Owner TAIYUAN BOILER GROUP
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