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Hydrogen peroxide method and wet method flue gas desulfurization process for carbide slag pretreatment

A wet flue gas desulfurization and hydrogen peroxide technology, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of unsatisfactory control of investment costs and operating costs, and reduce investment costs and The effect of running costs

Active Publication Date: 2012-05-30
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the currently applied wet flue gas desulfurization processes have not pretreated calcium carbide slag, so it is not very ideal in terms of controlling investment costs and operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The 75t / h coal-fired boiler of a company's self-provided thermal power plant adopts the calcium carbide slag-gypsum wet flue gas desulfurization process, and the flue gas volume is 155,000m 3 / h, flue gas SO 2 The concentration is 4000mg / Nm 3 , using external oxidation. Due to the small volume of the designed bubble tower, the oxidation residence time is not enough, and the sulfite cannot be oxidized to sulfate, resulting in extremely poor quality of gypsum, which is mostly dilute. After analyzing the calcium carbide slag used in the project, it was found that the carbide slag contained 1.05‰ reducing substances, so it was decided to modify the process and pretreat the carbide slag first. Add 2.4kg / m in the process of slag 3 hydrogen peroxide (hydrogen peroxide and S 2- The molar ratio of reducing substances calculated is 4:1), oxidize the reducing substances in it, stir for 1 hour, and then use the calcium carbide slag slurry after oxidation pretreatment for wet fl...

Embodiment 2

[0022] A 2×130t / h coal-fired boiler in a thermal power plant adopts the calcium carbide slag-gypsum wet flue gas desulfurization process, and the flue gas volume is 300,000Nm 3 / h, flue gas SO 2 The concentration is 3000mg / Nm 3 , the design liquid-gas ratio is 8L / m 3 , using tower oxidation. After analyzing the calcium carbide slag used in the project, it was found that the carbide slag contained 0.95‰ of reducing substances and was difficult to oxidize, so it was decided to pretreat the carbide slag first. Add 2.75kg / m in the process of slag 3 Hydrogen peroxide (the molar ratio of hydrogen peroxide and reducing substances is 5:1), oxidize the reducing substances in it, stir for 2 hours, and then use the calcium carbide slag slurry after oxidation pretreatment for wet flue gas desulfurization. The desulfurization efficiency reaches over 94%, the oxidation rate in the absorption tower reaches 50mmol / L·h, the moisture content of gypsum is lower than 10%, and the purity is hi...

Embodiment 3

[0024] A 2×220t / h coal-fired boiler in a thermal power plant adopts the calcium carbide slag-gypsum wet flue gas desulfurization process, and the flue gas volume is 420,000m 3 / h, flue gas SO 2 The concentration is 3800mg / Nm 3 , the design liquid-gas ratio is 10L / m 3 , using external oxidation. . After analyzing the calcium carbide slag used in the project, it was found that the carbide slag contained 1.2‰ reducing substances, so it was decided to pretreat the carbide slag first. Add 2.78kg / m in the process of slag 3 Hydrogen peroxide (the molar ratio of hydrogen peroxide and reducing substances is 4:1), oxidize the reducing substances in it, stir for 1.5 hours, and then use the calcium carbide slag slurry after oxidation pretreatment for wet flue gas desulfurization. The desulfurization efficiency reaches over 95%, the oxidation rate in the oxidation tower reaches 48.5mmol / L·h, the sulfite concentration in the oxidation tower is lower than 10mmol / L, the moisture content ...

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Abstract

The invention discloses a hydrogen peroxide method and wet method flue gas desulfurization process for carbide slag pretreatment. The process comprises the following steps of: performing wet desulfurization on flue gas by using carbide slag as a desulfurizer; adding hydrogen peroxide in the slag-smelting process of the carbide slag and stirring for 1 to 2 hours; performing oxidizing reaction to oxidize reducing substances in the carbide slag; and performing flue gas wet desulfurization by using the carbide slag after the oxidizing reaction as the desulfurizer. Because the desulfurizer carbideslag is subjected to the oxidation pretreatment in the method, the condition that the time of oxidating calcium sulfite into calcium sulfate is too long and even the condition that the calcium sulfite cannot be oxidized caused by overmuch reducing substances can be avoided. The carbide slag after the treatment can be used for wet flue gas desulfurization, so the volume of an absorption tower (in-tower oxidation) or an oxidation tower (out-tower oxidation) and the air quantity of an oxidation fan can be reduced, and the investment cost and the operating cost are reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a hydrogen peroxide wet flue gas desulfurization process with calcium carbide slag pretreatment. Background technique [0002] At present, my country's annual SO emissions 2 It has reached more than 20 million tons, and the area of ​​acid rain has reached more than 1 / 3 of the country's land area. Acid rain has become an important factor restricting my country's economic development, and the control of SO 2 , NO X Equal discharge is a key measure to prevent acid rain. Flue gas desulfurization is currently the most important desulfurization method. Among the many flue gas desulfurization technologies, wet flue gas desulfurization has always occupied a dominant position. At present, among the desulfurization devices that have been built in the world, wet desulfurization devices account for about 80%. With the characteristics of flexibility, strong applicability,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 吴忠标程常杰莫建松倪海波
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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