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Device and method for carrying out low-concentration SO2 flue gas desulfurization by utilizing fuzzy alkali-feeding method

A kind of SO2, low concentration technology, applied in the fields of environmental protection, chemical industry and smelting, to reduce labor intensity, eliminate untimely control, and facilitate control.

Inactive Publication Date: 2017-10-03
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the existing sodium-alkali desulfurization method, and to provide a low-concentration SO 2 Flue gas desulfurization device

Method used

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  • Device and method for carrying out low-concentration SO2 flue gas desulfurization by utilizing fuzzy alkali-feeding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The above-mentioned low-concentration SO 2 The flue gas desulfurization device is applied to a certain low concentration of SO in normal production 2 flue gas (SO 2 Concentration: 190mg / Nm 3 -1882mg / Nm 3 , with an average concentration of 890mg / Nm 3 , Flue gas volume: 163310Nm 3 / h-200206Nm 3 / h, the average gas volume is 180425Nm 3 / h) in desulfurization, due to SO 2 The concentration is low, and only fuzzy alkali addition can make the flue gas discharge up to the standard. The specific steps include the following steps: the operator switches the chain control on the DCS system of the central control room to the pH value of the main circulation system to control the alkali addition, and the alkali addition The pH value of the absorption liquid in the interlocking main circulation system is usually set at 4.8. When the pH value of the absorption liquid in the main circulation pipeline is less than 4.8, the pH signal is output through the signal isolator, and the ...

Embodiment 2

[0040] In this embodiment, the fuzzy alkali addition method is used to carry out low-concentration SO 2 The device of flue gas desulfurization is the same as embodiment 1, when it is applied to abnormal production, SO 2 A certain SO under the condition of unstable concentration 2 flue gas (SO 2 Concentration: 22mg / Nm 3 -14040mg / Nm 3 , average concentration: 5250mg / Nm 3 ;Smoke volume: 88298Nm 3 / h-190250Nm 3 / h, average gas volume: 129927Nm 3 In the desulfurization of / h), the following steps are specifically included: the operator switches the chain control to adopt the flue gas outlet SO on the DCS system of the central control room 2 Concentration control and alkali addition, alkali addition chain flue gas outlet SO 2 The concentration is usually set at 250mg / Nm 3 , when the desulfurization tower flue gas outlet SO 2 Concentration higher than 250mg / Nm 3 When the main soda adding valve is opened, the lye in the high tank will be added to the desulfurization tower t...

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Abstract

The invention discloses a device and a method for carrying out low-concentration SO2 flue gas desulfurization by utilizing a fuzzy alkali-feeding method. The device comprises a desulfurization tower, a main alkali-feeding valve, a fuzzy alkali-feeding valve, a reflowing valve, a liquid discharging valve, a water feeding valve, a primary circulating system pH (Potential of Hydrogen) detector, a secondary circulating system pH detector, a liquid level detector, a flue gas outlet SO2 concentration analyzer, a DCS (Distributed Control System) switching system, a signal isolator and an intelligent fuzzy controller. The point is that alkali-feeding desulfurization is carried out through logic control by utilizing the intelligent fuzzy controller; different alkali-feeding manners can be realized by alkali-feeding controlling through the DCS switching system according to different working conditions; the alkali-feeding controlling is more accurate, and the desulfurization effect is remarkable; meanwhile, consumed alkali in a tail gas control process is saved; a technological process is simple, and the operation is reliable; when normal production is performed, whole-time standard reaching of tail gas exhausting can be effectively ensured. Meanwhile, the labor intensity of maintenance personnel is reduced, and operating personnel conveniently control the device; a condition that tail gas emission exceeds standards, caused by the fact that the operating personnel are careless and the control is not in time, is eliminated.

Description

technical field [0001] The invention belongs to the technical fields of smelting, chemical industry, and environmental protection, and relates to a low-concentration SO 2 Device and method for flue gas desulfurization. Background technique [0002] low concentration SO 2 Flue gas desulfurization processes include activated coke method, new catalytic method, ionic liquid circulation method, sodium-alkali method, citrate absorption method, ammonia method, supergravity method, hydrogen peroxide method and other desulfurization processes, among which sodium-alkali method is particularly common. It has the advantages of fast absorption speed and large capacity, but the large consumption of absorbent and high operating costs are the most prominent problems restricting the sodium-alkali desulfurization technology. Contents of the invention [0003] The purpose of the present invention is to solve the problems existing in the existing sodium-alkali desulfurization method, and to...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D53/96B01D53/30
CPCB01D53/30B01D53/501B01D53/96B01D2251/304
Inventor 张宏昌马俊何春文李山东张鹏云王程飞刘娜田燕
Owner JINCHUAN GROUP LIMITED
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