CN106039940A - Waste acid recovery and utilization device for desulfurization and denitrification of exhaust gas - Google Patents

Waste acid recovery and utilization device for desulfurization and denitrification of exhaust gas Download PDF

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Publication number
CN106039940A
CN106039940A CN201610643225.8A CN201610643225A CN106039940A CN 106039940 A CN106039940 A CN 106039940A CN 201610643225 A CN201610643225 A CN 201610643225A CN 106039940 A CN106039940 A CN 106039940A
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CN
China
Prior art keywords
gas
waste acid
liquid
denitration
exhaust gas
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Application number
CN201610643225.8A
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Chinese (zh)
Inventor
陈辅利
刚占库
史树威
Original Assignee
辽宁信威环保科技有限公司
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Priority to CN201610643225.8A priority Critical patent/CN106039940A/en
Publication of CN106039940A publication Critical patent/CN106039940A/en

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Classifications

    • 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
    • B01D53/14Separation 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 by absorption
    • B01D53/1456Removing acid components
    • B01D53/1481Removing sulfur dioxide or sulfur trioxide
    • 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
    • B01D53/14Separation 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 by absorption
    • B01D53/1493Selection of liquid materials for use as absorbents
    • 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
    • B01D53/14Separation 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 by absorption
    • B01D53/18Absorbing units; Liquid distributors therefor
    • 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
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen 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
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/50Inorganic acids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2252/00Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10Inorganic absorbents
    • B01D2252/103Water
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The invention discloses a waste acid recovery and utilization device for desulfurization and denitrification of exhaust gas. A gas-liquid separator, a flue dust sweaper device and a plate-type gas-liquid heat exchanger are arranged between an exhaust gas inlet and a dust collector. The flue dust sweaper device is arranged between the exhaust gas inlet and the plate-type gas-liquid heat exchanger. The gas-liquid separator is disposed above the plate-type gas-liquid heat exchanger. An outlet of the dust collector is connected to an inlet of an induced draft fan. An outlet of the induced draft fan is connected to a sulfur dioxide absorbing device, an outlet of which is connected to a desulfurization and denitrification device. The invention has the following advantages: desulfurated and denitrated waste acid can be recovered and utilized on the spot so as to solve recovery and utilization problems of desulfurated and denitrated waste acid; recovery efficiency of waste acid is high, effect is good, and pH value meets the standard of denitration; by the use of residual heat from flue gas, recovery cost of waste acid is greatly reduced; by using on the spot, purchase quantity of a denitration reducing agent and acid is greatly reduced, and denitration cost is greatly decreased; and the device is simple, is convenient to operate, runs stably and is easy to control.

Description

The waste acid recycling device of exhuast gas desulfurization denitration

Technical field

The present invention relates to a kind of waste acid recycling device, particularly relate to the waste acid recycling of a kind of exhuast gas desulfurization denitration Device, belongs to combustion products process field.

Background technology

Nitrogen oxides is the main cause causing chemical fumes, is also the major reason of acid rain.Sulfur dioxide is acid rain Main cause.Desulfurization and denitration are two vital tasks of waste gas pollution control and treatment.

Desulfurizing method of exhaust gas mainly has dry type, half dry type and wet type desulfurizing.Dry type desulfurizing feeding lime stone, magnesium oxide etc. are dry Powder desulfurizing agent, directly with waste gas sulfur dioxide react and generate the dry product such as calcium sulfite, magnesium sulfite, then dedusting.Half The desulfurizer slurries such as dry type desulfurizing feeding lime, magnesium oxide, sodium hydroxide, directly react generation Asia with the sulfur dioxide in waste gas The dry product such as calcium sulfate, magnesium sulfite, then dedusting.Dry type, the advantage of half dry type desulfurization are to need not water, there is not pulp water and divide From with water recycle problem;Shortcoming is to react not thorough, and efficiency is low, is front and back required for dedusting, and repeated construction is serious, pressure drop Greatly, operating cost is high.First wet type desulfurizing sprays waste gas with doctor solution, and the sulfur dioxide in waste gas is transferred to be formed in water Asia Sulphuric acid, then in the alkali liquor such as feeding lime, magnesium oxide, sodium hydroxide and acid doctor solution, after slag-liquid separation, doctor solution follows Ring uses.The advantage of wet type desulfurizing is that sulfur dioxide transfer velocity is fast, and efficiency is high, effective;Shortcoming is to consume water, and doctor solution needs Want slag-liquid separation and recycle.Generally use wet type desulfurizing at present, seldom use dry type and half dry type desulfurization.

The main selective catalytic reduction method of main flow denitration technology (SCR) and SNCR method (SNCR).Its His technology mainly has the absorption of electronic beam method (EBA), activated coke, normal temperature oxidation reducing process etc..SCR law technology is at catalyst action Under, reducing agent NH3(liquefied ammonia, ammonia, carbamide etc.) and the NO in flue gasXReaction, by the NO in flue gasXIt is reduced to nitrogen and water.Its Reactor is arranged between boiler economizer outlet and air preheater entrance, and reaction temperature is typically between 320 DEG C-400 DEG C. SNCR law technology NH3, the reducing agent such as carbamide spray into the region that in-furnace temperature is 850~1100 DEG C, reducing agent with in flue gas NOxCarry out selective reaction, NOxIt is reduced to nitrogen and water.SCR and SNCR technology be required for specific reaction temperature condition and Strict automatically controls, and the reaction of reducing agent deficiency is not thorough, and instead excess produces the escaping of ammonia increases nitrogen oxides, results in process Effect reduces.The high energy particle that electronic beam method utilizes electron accelerator to produce irradiates flue gas so that it is SO2And NOxOxidation generates sulphuric acid And nitric acid, then react generation ammonium sulphate and nitric acid ammonia with the ammonia added.This technology does not has waste water, it is not necessary to catalyst, to flue gas Condition change strong adaptability, but power consumption is big, is not also suitable for large-scale application.Active coke absorption method activated coke carries out cigarette Desulfurization and denitrogenation while gas.SO2Being adsorbed by activated coke, by hot recycling, product is converted into the pairs such as sulfur, sulphuric acid, chemical fertilizer Product.NOXIt is under conditions of ammonification, generates water and nitrogen through the catalytic action of activated coke and enter air again.This technology does not has Waste water, it is not necessary to catalyst, changes strong adaptability, but operation is more complicated flue gas condition, and side-product produces complexity, carbon consumption Greatly, tower pressure drop is big.NO is first oxidized to NO by normal temperature oxidation reducing process2, then by NO2Transfer to water becomes HNO3, finally utilize H2SO3By HNO3It is reduced into N2Discharge.This technical matters process is similar with desulfurization, it is not necessary to reducing agent, suitable to flue gas condition change Ying Xingqiang, moreover it is possible to noxious substances such as simultaneous oxidation two English and remove removing heavy metals etc., operating cost is low, and difficult point is oxidation and also Former control.

Containing substantial amounts of dust, carbon dioxide, sulfur dioxide and nitrogen oxides in coal combustion exhaust, need to carry out dedusting, take off Sulfur, denitration process.Normal temperature oxidation reduction denitration needs substantial amounts of oxidant, reducing agent sulfurous acid and nertralizer alkali, wet type desulfurizing Producing substantial amounts of sulfurous acid, need a large amount of alkali, coal combustion exhaust typically requires desulphurization denitration.Current desulfurizing and denitrifying process has no There are report and the data of waste acid recycling.

Summary of the invention

It is an object of the invention to overcome weak point in prior art, and provide the spent acid of a kind of exhuast gas desulfurization denitration to return Receipts utilize device.

The waste acid recycling device of this exhuast gas desulfurization denitration, including exhaust gas inlet, dust arrester, air-introduced machine, waste gas Be provided with gas-liquid separator between import and dust arrester, flue dust inhales sweeping device, board-like gas-liquid heat-exchange, exhaust gas inlet and board-like gas Be provided with flue dust between liquid heat exchanger and inhale sweeping device, board-like gas-liquid heat-exchange be arranged over gas-liquid separator, dust arrester exports Being connected with air-introduced machine import, air-introduced machine outlet connects apparatus for absorbing SO 2, and the outlet of apparatus for absorbing SO 2 connects de- Sulfur denitrification apparatus.

It is provided with absorbing liquid elevator pump between described board-like gas-liquid heat-exchange and apparatus for absorbing SO 2.

The invention has the advantages that:

1. the spent acid of desulphurization denitration reclaims on the spot and utilizes, and solves recovery and the utilization of desulphurization denitration spent acid on the spot;

2. waste acidity recovery efficiency is high, and effective, pH value has reached the requirement of denitration.

3. utilize fume afterheat, greatly reduce waste acidity recovery cost;

4. local use, greatly reduces denitrification reducing agent and the amount of purchase of acid, greatly reduces denitration cost;

5. device is simple, easy to operate, stable, controls easily.

Accompanying drawing explanation

Fig. 1 is the structural representation of the waste acid recycling device of exhuast gas desulfurization denitration.

Labelling in figure: 1-gas-liquid separator, 2-flue dust blow device, the board-like gas-liquid heat-exchange of 3-, 4-sulfur dioxide absorb Device, 5-absorbing liquid elevator pump, 6-exhaust gas inlet, 7-dust arrester, 8-air-introduced machine, 9-desulfuring and denitrifying apparatus.

Detailed description of the invention

Below in conjunction with the accompanying drawings the waste acid recycling device of exhuast gas desulfurization denitration is further described.

The waste acid recycling device of this exhuast gas desulfurization denitration, including exhaust gas inlet 6, dust arrester 7, air-introduced machine 8, useless Be provided with gas-liquid separator 1 between gas import 6 and dust arrester 7, flue dust inhales sweeping device 2, board-like gas-liquid heat-exchange 3, exhaust gas inlet 6 And be provided with between board-like gas-liquid heat-exchange 3 flue dust inhale sweeping device 2, board-like gas-liquid heat-exchange 3 be arranged over gas-liquid separator 2, Dust arrester 7 outlet is connected with air-introduced machine 8 import, and air-introduced machine 8 outlet connects apparatus for absorbing SO 24, and sulfur dioxide absorbs The outlet of device 4 connects desulfuring and denitrifying apparatus 9.It is provided with absorbing liquid between board-like gas-liquid heat-exchange 3 and apparatus for absorbing SO 24 Elevator pump 5.

The waste acid recycling device of this exhuast gas desulfurization denitration is by gas-liquid separator 1, flue dust blow device 2, board-like gas Liquid heat exchanger 3, apparatus for absorbing SO 24, absorbing liquid elevator pump 5 etc. form;Hot waste gas first passes around exhaust gas inlet 6 and enters plate Formula gas-liquid heat-exchange 3 carries out gas-liquid vapor liquid heat exchange, enters dust arrester 7 dedusting after hot waste gas cooling, and the waste gas after dedusting enters Entering apparatus for absorbing SO 24, the sulfur dioxide in flue gas transfers to be formed in absorbing liquid sulfurous acid, and waste gas enters desulphurization denitration Device 9;Fresh water (FW) or doctor solution initially enter, as absorbing liquid, the sulfur dioxide shape that apparatus for absorbing SO 24 absorbs in flue gas Becoming sulfurous acid, absorbing liquid elevator pump 5 deliver to board-like gas-liquid heat-exchange 3, absorbing liquid heat absorption heats up and evaporates, and gas-liquid mixture passes through Gas-liquid separator 1 carries out gas-liquid separation, and gas returns to apparatus for absorbing SO 24, and liquid returns to board-like gas-liquid heat-exchange 3, plate Dope in formula gas-liquid heat-exchange 3 delivers to the desulfuring and denitrifying apparatus 9 reducing agent utilization as denitration;Board-like gas-liquid heat-exchange 3 gas The dust of phase surface is fallen into ash bucket by flue dust blow device 2 purging.

For fume emission, the sulfur dioxide concentration in flue gas is the highest, is far longer than discharge standard;For acid recovery, cigarette Sulfur dioxide concentration in gas is the lowest, and absorbing liquid pH value can only achieve 3-4, how to bring up to meet requirement by absorbing liquid pH value 1 key problem in technology that the following is desulphurization denitration waste acid recycling.In the present invention, the sulfur dioxide in flue gas, through absorbing, is inhaled Receiving liquid pH value and reach 3, absorbing liquid is warmed to 100 DEG C of evaporation and concentration by the waste heat of recycling flue gas, absorbing liquid pH value reach 1 with Under, absorbing liquid acid concentration has reached the requirement of denitration, it is achieved that the spent acid of desulphurization denitration reclaims on the spot and utilizes,

Sulfur dioxide in recovered flue gas produces the sulfurous acid reducing agent as denitration.

The present invention relates to F23J combustion products process field, the chemically and physically chemistry specifically utilizing sulfur dioxide is special Property, theoretical according to gas transfer, chemistry and evaporation and concentration, define the waste acid recycling device of waste gas exhuast gas desulfurization denitration, Sulfur dioxide generation sulfurous acid in recovered flue gas, as the reducing agent of denitration, is greatly saved reducing agent and antacid desulfurization The consumption of agent, greatly reduces the operating cost of flue gas desulfurization and denitrification.

Claims (2)

1. a waste acid recycling device for exhuast gas desulfurization denitration, including exhaust gas inlet (6), dust arrester (7), air-introduced machine (8), it is characterised in that: be provided with between exhaust gas inlet (6) and dust arrester (7) gas-liquid separator (1), flue dust inhale sweeping device (2), Board-like gas-liquid heat-exchange (3), is provided with flue dust and inhales sweeping device (2) between exhaust gas inlet (6) and board-like gas-liquid heat-exchange (3), board-like Gas-liquid heat-exchange (3) be arranged over gas-liquid separator (1), dust arrester (7) outlet is connected with air-introduced machine (8) import, air inducing Machine (8) outlet connects apparatus for absorbing SO 2 (4), and the outlet of apparatus for absorbing SO 2 (4) connects desulfuring and denitrifying apparatus (9)。
The waste acid recycling device of exhuast gas desulfurization denitration the most according to claim 1, described board-like gas-liquid heat-exchange And between apparatus for absorbing SO 2 (4), be provided with absorbing liquid elevator pump (5) (3).
CN201610643225.8A 2016-08-08 2016-08-08 Waste acid recovery and utilization device for desulfurization and denitrification of exhaust gas CN106039940A (en)

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Application publication date: 20161026