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Device and method for removing sulfur trioxide from coal-fired flue gas

A technology for sulfur trioxide and coal-fired flue gas, which is applied in chemical instruments and methods, separation methods, gas treatment and other directions to achieve the effects of reducing hazards, ultra-low emissions, and realizing ultra-low emissions

Pending Publication Date: 2017-01-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For SO in coal-fired flue gas 3 The problem that arises, the present invention proposes a kind of coal-fired flue gas sulfur trioxide removal device and method applicable to different flue gas conditions

Method used

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  • Device and method for removing sulfur trioxide from coal-fired flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] refer to figure 1 , a coal-fired flue gas sulfur trioxide removal device, including a flue 13, the device also includes a coarse material bin 1, a screw feeder 2, an air classification mill 3, and a fine material bin 4 connected in sequence , loss-in-weight feeder 5, main pipeline 8, separator 9 and spray gun 11, described spray gun 11 is arranged in the flue 13, is arranged with static mixer 12 in the downstream flue of spray gun 11; Described main pipeline 8 also passes The air dryer 7 communicates with the blower 6 .

[0041] The main pipeline 8 communicates with several pipeline branches 10 through a separator 9, and each pipeline branch communicates with a corresponding spray gun 11; the number of the pipeline branches is four. The fine material bin is a sealing device, and is equipped with a drying device to prevent the alkaline absorbent from agglomerating, scaling, and blocking the pipeline due to water absorption.

[0042] The location where the alkaline abso...

Embodiment 2

[0044] Removal of SO in flue before SCR 3 , the flue position is between the economizer and the SCR reactor. Flue gas temperature 400°C, SO 3 Concentration 25ppm. According to the flue gas conditions there, select trona (Na 2 CO 3 ·NaHCO 3 2H 2 O) as absorbent, trona and SO 3 The molar ratio is 2:1. The average particle size of the trona coarse material is 2mm, the average particle size of the fine material is determined to be 40μm, and the residence time of the alkaline absorbent in the flue is 2s.

[0045] Such as figure 1 As shown, when the system is running, a large amount of trona coarse material is stored in the coarse material bin 1, with an average particle size of 2 mm. The bottom of the coarse material bin 1 is connected with the screw feeder 2; the trona with coarse particles is sent to the air classification mill 3 by the screw feeder 2, and the trona is ground to an average particle size of 40 μm, and then sent into the fine material bin 4 The fine mater...

Embodiment 3

[0048] The difference between this embodiment and embodiment 2 is to remove the SO in the flue before the air preheater 3 , the flue position is between the SCR reactor and the air preheater. Flue gas temperature 250°C, SO 3 The concentration is 40ppm. According to the flue gas conditions there, choose Mg(OH) 2 As absorbent, Mg(OH) 2 with SO 3 The molar ratio is 4:1. Mg(OH) 2 The particle size of the coarse material is 3mm, the average particle size of the fine material is determined to be 60μm, and the residence time of the alkaline absorbent in the flue is 1s.

[0049] Under the design conditions, the SO can be guaranteed 3 The removal efficiency is 84%. Effectively prevent the clogging and corrosion of the air preheater.

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Abstract

The invention relates to a device and a method for removing sulfur trioxide from coal-fired flue gas. The device comprises a rough stock bin, a screw type feeder, an air gradation mill, a fine stock bin and a weightless type feeder which are connected with each other in turn, wherein the lower part of the weightless type feeder is connected with a main pipeline; air from an air feeder is dried by an air dryer and then is fed into the main pipeline; an alkali absorbent from the weightless type feeder is pneumatically transmitted; a main pipeline terminal is connected with separators; the main pipeline is uniformly divided into a plurality of branches by the separators; a spray gun is respectively connected with each branch; the spray guns are uniformly arranged on a cross section of a flue; a static mixer is arranged on a downstream flue of the spray guns; the alkali absorbents sprayed by the spray guns are uniformly mixed with the flue gas. The device can select different alkali absorbents according to different flue gas conditions and flue positions. The spray guns are used for jetting the alkali absorbents into the flue for absorbing SO3 in the flue gas, so that the harm of SO3 to the operation of the power plant is reduced and the ultralow SO3 emission is realized.

Description

technical field [0001] The invention belongs to the technical field of air pollutant control, and in particular relates to a device and method for removing sulfur trioxide from coal-fired flue gas. Background technique [0002] SO 2 and NO X It is one of the main air pollutants in the flue gas of coal-fired power plants. In order to reduce NO X Most coal-fired power plants have installed SCR denitrification devices. SCR catalysts have the potential to make part of the SO 2 catalytic oxidation to SO 3 , plus the SO generated in the furnace 3 , so that SO 3 Reaching a certain concentration will cause harm to the power plant, such as catalyst poisoning, air preheater blockage, flue corrosion, etc. Electrostatic precipitators and wet scrubbers for SO 3 has limited removal capacity, SO 3 Emissions of smog into the atmosphere will aggravate the smog and cause environmental pollution. When burning high-sulfur coal, SO 3 caused more serious problems. Realize SO 3 The de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/83
CPCB01D53/508B01D53/83B01D2258/0283
Inventor 高翔郑成航骆仲泱倪明江岑可法张涌新刘勇王丁振王毅翁卫国吴卫红宋浩张悠
Owner ZHEJIANG UNIV
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