CN106000026A - Wet flue gas desulfurization device adopting series connection - Google Patents

Wet flue gas desulfurization device adopting series connection Download PDF

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Publication number
CN106000026A
CN106000026A CN201610328266.8A CN201610328266A CN106000026A CN 106000026 A CN106000026 A CN 106000026A CN 201610328266 A CN201610328266 A CN 201610328266A CN 106000026 A CN106000026 A CN 106000026A
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CN
China
Prior art keywords
flue gas
desulfurization
grade desulfurizing
wet flue
unit
Prior art date
Application number
CN201610328266.8A
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Chinese (zh)
Inventor
董尊久
张蕾
乔宗良
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董尊久
张蕾
乔宗良
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Priority to CN201610328266.8A priority Critical patent/CN106000026A/en
Publication of CN106000026A publication Critical patent/CN106000026A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/73After-treatment of removed components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact

Abstract

The invention discloses a wet flue gas desulfurization device adopting series connection. The wet flue gas desulfurization device comprises a primary desulfurization unit, a partition group, a cleaning solution collection unit, a secondary desulfurization unit and a demisting unit which are connected in series, wherein the primary desulfurization unit comprises a primary desulfurization liquid oxidation area and a primary desulfurization area sequentially from bottom to top; the partition group comprises a bracket, U-shaped bottom plates and an orifice plate sequentially from bottom to top; the cleaning solution collection unit comprises a cleaning solution collection main pipe, an overflow pipe and a cleaning solution tank; the secondary desulfurization unit comprises a secondary desulfurization area and desulfurization liquid spray nozzles; the demisting unit comprises a demister, a demister flushing water device and a flue gas outlet sequentially from bottom to top. According to a method, the primary desulfurization unit performs desulfurization with a limestone-gypsum method; the secondary desulfurization unit performs desulfurization with a natrium-alkali method; the final desulfurization efficiency is controlled by regulating the pH value of the cleaning solution of the secondary desulfurization unit. Purified flue gas is exhausted from the flue gas outlet after mist in the flue gas is removed by the demisting unit.

Description

A kind of tandem wet flue gas desulfurizer

Technical field

The invention belongs to the technical field of a kind of wet flue gas desulfurizer, relate to wet flue gas grading desulfurization technology and the structure of wet method tandem desulfurizing tower.

Background technology

Atmospheric pollution now is the most serious, some areas are perplexed by haze weather, atmospheric pollution becomes the key factor of restriction society sustainable and healthy development, 13 planning propose " deeply implementing prevention and cure of pollution action plan; carry forward vigorously pollutant discharge in compliance with the standard and total amount reduces discharging ", this not only needs to accelerate economic transition, optimize the structure of production and reduce the discharge of pollutant, also needing to upgrades to existing Pollutant Treatment equipment meets tightened up discharge standard, thus reaches the purpose that the total amount of pollutant reduces discharging.

Sulfur dioxide is one of Air Pollutant Discharge, and in sulfur dioxide and air, gas pollutant carries out the Atmospheric Chemistry reaction of complexity, forms sulfate, nitrate second particle, gas pollutant is converted into solid pollutant, directly results in PM2.5 and raises.

The medium-and-large-sized coal-burning power plant of China's overwhelming majority uses wet fuel gas desulfurizing technology (WFGD), according to the difference of desulfurizing agent, limestone can be divided into again--gypsum wet desulfurization, Dual alkali wet desulphurization, soda wet desulphurization, the ammonia process of desulfurization, magnesium oxide method desulfurization etc..By most widely used limestone--as a example by gypsum wet desulfurization (coal-burning power plant of more than 90% uses limestone--gypsum), its desulfuration efficiency is attained by more than 90%, sulfur dioxide in flue gas concentration of emission after purification is not higher than 200 milligrams/cubic metre, but flue gas still contains a small amount of sulfuric acid mist, inorganic salt microgranule (being formed in sweetening process), enter in air, pollutant atmosphere.Due to design structure, desulfurizing agent, the restriction of operating cost, existing spray column is difficult to the raising desulfuration efficiency of another step, it is impossible to reach the minimum discharge standard that government department requires.

Summary of the invention

Goal of the invention: set up a dividing plate group in the middle and upper part of existing spray column, the scrubbing section carrying out improved spray column is divided into two-stage, and every one-level can isolated operation.First grade desulfurizing uses limestone--gypsum, preliminary desulfuration efficiency 90%;Two-grade desulfurizing uses sodium alkali, and desulfuration efficiency more than 98%, sulfur dioxide emissioning concentration is by two-grade desulfurizing control.Two kinds of desulfurizing agents use in same spray column, are greatly improved desulfuration efficiency, the effective discharge reducing pollutant.

Technical scheme: a kind of tandem wet flue gas desulfurizer, described device is composed in series by first grade desulfurizing device, dividing plate group, cleaning mixture collection device, two-grade desulfurizing device and a demister, described first grade desulfurizing device is followed successively by first grade desulfurizing liquid (lime stone slurry) zoneofoxidation, first grade desulfurizing district from lower to upper, in first grade desulfurizing district, it is disposed with smoke inlet, doctor solution nozzle from lower to upper.Described dividing plate group is followed successively by support, U-shaped chassis, orifice plate from lower to upper, and U-shaped chassis is rack-mount by bolt, and there is angle of inclination (8-12 degree) on U-shaped chassis, and orifice plate is laid on U-shaped chassis.Described cleaning mixture collection device is made up of the female pipe of cleaning mixture collection, overflow pipe, washing liquid tank, cleaning mixture falls and then drops to U-shaped chassis on orifice plate, and the cleaning mixture being pooled to be connected with U-shaped chassis under gravity is collected mother's pipe and then entered washing liquid tank by overflow pipe.Flushing water introduces from one end, U-shaped chassis, is the most also pooled to the female pipe of cleaning mixture collection and enters washing liquid tank by overflow pipe.Described two-grade desulfurizing device has two-grade desulfurizing district, doctor solution nozzle.Described demister and flue gas desulfurization device are integral type structure, are arranged on two-grade desulfurizing device, and described demister has demister, mist eliminator flushing water device, exhanst gas outlet the most successively.

A kind of tandem wet flue gas desulfurizer, it is characterised in that desulfurized step is: flue gas uses desulfurization by lime gypsum method with first grade desulfurizing cleaning mixture counter current contacting, this level after the bottom of first grade desulfurizing device entrance desulfurizing tower, and desulfuration efficiency is up to 90%;Then flue gas enters two-grade desulfurizing device by dividing plate group, and flue gas is when by dividing plate group, and the solid particle in flue gas collides dividing plate and changes direction, due to the effect of inertia force, makes solid particle separate from flue gas and is washed liquid capture;Two-grade desulfurizing device uses sodium alkali desulfurization, and soda activity is high, has the highest desulfurization degree (more than 98%);Control final desulfuration efficiency by the pH value of regulation two-grade desulfurizing cleaning mixture, make sulfur dioxide emissioning concentration meet the minimum discharge standard of administration request.Flue gas after desulfurizing and purifying is discharged from exhanst gas outlet after the droplet removed in flue gas of demister.

Beneficial effect: owing to using the form of tandem desulfurization, first grade desulfurizing agent is lime stone slurry, and two-grade desulfurizing agent is soda solution.When first grade desulfurizing, the sulfur dioxide of 90% has been removed, and uses the amount of soda to greatly reduce during two-grade desulfurizing;Limestone abundance and cheap, can make up and run inferior position costly when using sodium alkali desulfurization completely.Soda activity is high, still can guarantee that the efficiency of two-grade desulfurizing in the case of relatively low liquid-gas ratio, and sodium alkali can overcome the disadvantages that limestone-gypsum method easily block, the shortcoming of corrosion easy to wear.When isolated operation, two-step desulfurization device can reach the desulfurization degree of more than 90%, is ensureing in the case of desulfuration efficiency, the operating load scalable of firsts and seconds, is adapted to different operating conditions, stable and desulfuration efficiency can reach more than 98%.

Accompanying drawing explanation

Fig. 1 is the structural representation of the embodiment of the present invention.

Fig. 2 is dividing plate group structural representation.

In figure: 1--desulfurizing tower;2--doctor solution nozzle;Mother's pipe collected by 3--doctor solution;4--rinses Jellyfish pipe;5--dividing plate group;6--doctor solution nozzle;7--demister;8--doctor solution collecting tank;9--circulating pump;10--circulating pump;11--flushing water nozzle;12--support;13--tower wall;14--bolt;15--U shape chassis;16--orifice plate;17--aperture;A--one-level cleaning mixture zoneofoxidation;B--first grade desulfurizing district;C--two-grade desulfurizing district;Desulfurizing agent 1--lime stone slurry;Desulfurizing agent 2--sodium hydroxide solution.

Detailed description of the invention

Below in conjunction with Fig. 1,2, the present invention is elaborated: described device is composed in series by first grade desulfurizing device, dividing plate group, cleaning mixture collection device, two-grade desulfurizing device and a demister, and described first grade desulfurizing device is followed successively by first grade desulfurizing liquid (lime stone slurry) zoneofoxidation, first grade desulfurizing district from lower to upper;In first grade desulfurizing district, it is disposed with smoke inlet, doctor solution nozzle from lower to upper.Described dividing plate group is followed successively by support, U-shaped chassis, orifice plate (percent opening 30%-40%) from lower to upper, and U-shaped chassis is rack-mount by bolt, and there is (8-12 degree) angle of inclination on U-shaped chassis, and orifice plate is laid on U-shaped chassis.Described cleaning mixture collection device is made up of the female pipe of cleaning mixture collection, overflow pipe, washing liquid tank;Cleaning mixture falls and then drops to U-shaped chassis on orifice plate, and the cleaning mixture being pooled to be connected with U-shaped chassis under gravity is collected mother's pipe and then entered washing liquid tank by overflow pipe.Flushing water introduces from one end, U-shaped chassis, is the most also pooled to the female pipe of cleaning mixture collection and enters washing liquid tank by overflow pipe.Described two-grade desulfurizing device has two-grade desulfurizing district, doctor solution nozzle.Described demister and flue gas desulfurization device are integral type structure, are arranged on two-grade desulfurizing device, and described demister has demister, mist eliminator flushing water device, exhanst gas outlet the most successively.

A kind of tandem wet flue gas desulfurizer, it is characterised in that desulfurized step is: flue gas uses desulfurization by lime gypsum method with first grade desulfurizing cleaning mixture counter current contacting, this level after the bottom of first grade desulfurizing device entrance desulfurizing tower, and desulfuration efficiency is up to 90%;Then flue gas enters two-grade desulfurizing device by dividing plate group, and flue gas is when by dividing plate group, and the solid particle in flue gas collides dividing plate and changes direction, due to the effect of inertia force, makes solid particle separate from flue gas and is washed liquid capture;Two-grade desulfurizing device uses sodium alkali desulfurization, and soda activity is high, has the highest desulfurization degree (more than 98%);Control desulfuration efficiency by the pH value of regulation two-grade desulfurizing cleaning mixture, make sulfur dioxide emissioning concentration reach the minimum discharge standard of administration request.Flue gas after desulfurizing and purifying is discharged from exhanst gas outlet after the droplet in demister removes flue gas.

Claims (9)

1. a tandem wet flue gas desulfurizer, is composed in series by first grade desulfurizing device, dividing plate group, cleaning mixture collection device, two-grade desulfurizing device and a demister.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterised in that: first grade desulfurizing device is followed successively by first grade desulfurizing liquid (lime stone slurry) zoneofoxidation, first grade desulfurizing district from lower to upper.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterised in that: first grade desulfurizing district, it is disposed with smoke inlet, doctor solution nozzle from lower to upper.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterized in that, dividing plate group is followed successively by support, U-shaped chassis, orifice plate (percent opening 20%-30%) from lower to upper, U-shaped chassis is rack-mount by bolt, there is angle of inclination (8-12 degree) on U-shaped chassis, and orifice plate is laid on U-shaped chassis.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterized in that: cleaning mixture collection device is made up of the female pipe of cleaning mixture collection, overflow pipe, washing liquid tank, cleaning mixture falls and then drops to U-shaped chassis on orifice plate, and the cleaning mixture being pooled to be connected with U-shaped chassis under gravity is collected mother's pipe and then entered washing liquid tank by overflow pipe.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterised in that: flushing water introduces from one end, U-shaped chassis, is the most also pooled to the female pipe of cleaning mixture collection and enters washing liquid tank by overflow pipe.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterised in that: two-grade desulfurizing device has two-grade desulfurizing district, doctor solution nozzle.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterized in that: demister and flue gas desulfurization device are integral type structure, being arranged on two-grade desulfurizing device, demister has demister, mist eliminator flushing water device, exhanst gas outlet the most successively.
A kind of tandem wet flue gas desulfurizer the most according to claim 1, it is characterised in that: control final desulfuration efficiency by the pH value of regulation two-grade desulfurizing cleaning mixture.
CN201610328266.8A 2016-05-18 2016-05-18 Wet flue gas desulfurization device adopting series connection CN106000026A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101053744A (en) * 2007-02-13 2007-10-17 浙江天蓝脱硫除尘有限公司 Segmented calcium and sodium double alkali method desulfurizing technology and device thereof
US20080257157A1 (en) * 2004-05-08 2008-10-23 Qingbao Huang Device for the Removal of Soot Dust of Fuel Oil Combustion
CN102553427A (en) * 2011-12-26 2012-07-11 浙江天蓝环保技术股份有限公司 Process and device for flue gas wet desulphurization using carbide slag or white clay as desulfurizing agent
CN103721548A (en) * 2014-01-17 2014-04-16 东南大学 Desulfurization device and desulfurization method for promoting removal of PM2.5 in clean flue gas after wet desulphurization
CN103846005A (en) * 2014-03-10 2014-06-11 北京国电龙源环保工程有限公司 Wet process flue gas desulfurization device and method for classified washing
CN204107307U (en) * 2014-06-20 2015-01-21 北京中冶隆生环保科技发展有限公司 The multiple stage turbocharger turbulent flow wet desulphurization device of flue gas
CN204841396U (en) * 2015-07-27 2015-12-09 航天环境工程有限公司 SOx/NOx control integration absorbing device
CN205127723U (en) * 2015-11-27 2016-04-06 江苏广鸿环境工程有限公司 High -efficient doublestage subregion sprays desulfurizing tower

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080257157A1 (en) * 2004-05-08 2008-10-23 Qingbao Huang Device for the Removal of Soot Dust of Fuel Oil Combustion
CN101053744A (en) * 2007-02-13 2007-10-17 浙江天蓝脱硫除尘有限公司 Segmented calcium and sodium double alkali method desulfurizing technology and device thereof
CN102553427A (en) * 2011-12-26 2012-07-11 浙江天蓝环保技术股份有限公司 Process and device for flue gas wet desulphurization using carbide slag or white clay as desulfurizing agent
CN103721548A (en) * 2014-01-17 2014-04-16 东南大学 Desulfurization device and desulfurization method for promoting removal of PM2.5 in clean flue gas after wet desulphurization
CN103846005A (en) * 2014-03-10 2014-06-11 北京国电龙源环保工程有限公司 Wet process flue gas desulfurization device and method for classified washing
CN204107307U (en) * 2014-06-20 2015-01-21 北京中冶隆生环保科技发展有限公司 The multiple stage turbocharger turbulent flow wet desulphurization device of flue gas
CN204841396U (en) * 2015-07-27 2015-12-09 航天环境工程有限公司 SOx/NOx control integration absorbing device
CN205127723U (en) * 2015-11-27 2016-04-06 江苏广鸿环境工程有限公司 High -efficient doublestage subregion sprays desulfurizing tower

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Application publication date: 20161012