CN101280926A - Exhaust gas purifying device and purification method thereof - Google Patents

Exhaust gas purifying device and purification method thereof Download PDF

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Publication number
CN101280926A
CN101280926A CNA2007100921209A CN200710092120A CN101280926A CN 101280926 A CN101280926 A CN 101280926A CN A2007100921209 A CNA2007100921209 A CN A2007100921209A CN 200710092120 A CN200710092120 A CN 200710092120A CN 101280926 A CN101280926 A CN 101280926A
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CN
China
Prior art keywords
waste gas
cooling
dust
unit
order
Prior art date
Application number
CNA2007100921209A
Other languages
Chinese (zh)
Inventor
卢冠均
Original Assignee
卢冠均
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 卢冠均 filed Critical 卢冠均
Priority to CNA2007100921209A priority Critical patent/CN101280926A/en
Publication of CN101280926A publication Critical patent/CN101280926A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • F01N3/043Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
    • 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
    • B01D53/504Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • 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
    • B01D53/62Carbon 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/005Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for draining or otherwise eliminating condensates or moisture accumulating in the apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/40Alkaline earth metal or magnesium compounds
    • B01D2251/404Alkaline earth metal or magnesium compounds of calcium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/30Sulfur compounds
    • B01D2257/304Hydrogen sulfide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/50Carbon oxides
    • B01D2257/504Carbon dioxide
    • Y02A50/2342
    • Y02C10/04
    • Y02E20/326
    • Y02T10/20

Abstract

The invention discloses a waste gas purifier, including a cooling unit with a cooling room for containing liquid coolant and a waste gas transfer tube penetrating the cooling room and immerged into the liquid coolant, the cooling unit is used for cooling waste gas inputted into the transfer tube; a dust removing unit arranged on backward position side of the cooling unit for removing harmful substance and flour dust contained in the waste gas; a absorption unit arranged on backward position side of the dust removing unit and containing the absorption liquid, for removing carbonic anhydride and precipitate from the waste gas by reacting the absorption liquid with the carbonic anhydride and precipitate in the waste gas to generate precipitate; and a purification unit arranged on backward position side of the absorption unit and containing purified water for removing remained harmful substance and flour dust in the waste gas. The invention also discloses an exhaust gas cleaning method.

Description

Waste gas purification apparatus and purification method thereof

Technical field

The present invention relates to a kind of waste gas purification apparatus and purification method thereof, more specifically, relate to a kind of waste gas purification apparatus and purification method thereof, it can be in order to remove dust, carbon dioxide, sulfide and other harmful substances that contains in the waste gas, with purifying exhaust air.

Background technology

Along with the development of society, people are more and more stronger for the consciousness of environmental protection.Yet, the mankind are burning mineral fuel, oil product and organic matter in order to obtain more energy, but do not produce all the time and contain dust, carbon dioxide, sulfide and harmful substance in a large number, such as the waste gas of dioxin (PCDD), TCDD, dioxin.Dust in the waste gas causes air quality to worsen; Carbon dioxide causes greenhouse effects, makes global warming; Sulfide produces acid rain, causes soil acidification, and mineral matter runs off, and influences plant production; And present the solid granulates shape at normal temperatures such as the harmful substance of dioxin, dioxin, and be very easy to accumulation in vivo, make that dioxin, the dioxin in the natural environment is difficult to the natural degradation elimination.They all are the arch-criminals of climate warming, ecological deterioration.Yet, also there is not a kind of purifier simple in structure so far, can carry out high efficiency purification to the waste gas that combustion grate removes.

Summary of the invention

At the above-mentioned problems in the prior art, the present invention proposes a kind of waste gas purification apparatus, this waste gas purification apparatus comprises: cooling unit, the waste gas transfer tube that it has the cooling chamber that holds cooling fluid and runs through cooling chamber and immerse cooling fluid is in order to cool off the waste gas in the input waste gas transfer tube; Dust removing units, it is arranged at described cooling unit downstream, in order to remove harmful substance and the dust that contains in the waste gas; Absorptive unit, it is arranged at described dust removing units downstream and accommodates absorption liquid, in order to carbon dioxide and sulfide reaction generation sediment by containing in absorption liquid and the waste gas, and carbon dioxide and sulfide in the removal waste gas; And clean unit, it is arranged at described absorptive unit downstream and accommodates and purifies waste water, in order to remove remaining harmful substance and the dust that contains in the waste gas.

This cooling chamber can comprise the cooling-liquid level adjusting device, to regulate the liquid level of the cooling fluid of holding in the cooling chamber, so that described waste gas transfer tube immerses in the cooling fluid all the time.On the other hand, this cooling chamber can be an airtight container, and it is provided with vapour-recovery unit, to recycle the steam that cooling fluid produces in the cooling exhaust process.

Between described dust removing units and the absorptive unit pumping installations is set, in order to will deliver to the bottom of described absorptive unit, so that waste gas is released in the described absorptive unit under the absorption liquid liquid level from the waste gas pump of described dust removing units output.

This waste gas purification apparatus can also comprise air reservoir, and this air reservoir is arranged on described cooling unit upstream, before waste gas is imported cooling unit waste gas is left standstill, to remove the big dust particle in the waste gas.

The present invention also provides a kind of exhaust gas purifying method, and this method may further comprise the steps: cooling step, in order to waste gas is cooled off; Dust removal step is in order to harmful substance and the dust that contains in the waste gas after the removal cooling processing; Absorption step is in order to carbon dioxide and the sulfide that contains in the waste gas after the removal dust removal process; And purifying step, absorbed the remaining harmful substance and the dust that contain in the waste gas of processing in order to removal.

This cooling step can also comprise the Steam Recovery step, to recycle the steam that produces in the cooling step.This absorption step can also comprise the absorption liquid purifying step, in order to remove the sediment that produces in the absorption step and to replenish absorption liquid.

This exhaust gas purifying method can also comprise and leaves standstill step, in order to waste gas is being carried out before the cooling step waste gas being left standstill, to remove the big dust particle that contains in the waste gas.

Description of drawings

Describe the present invention with reference to the accompanying drawings in detail, wherein:

Fig. 1 is the elevational cross-sectional view according to waste gas purification apparatus embodiment of the present invention; And

Fig. 2 is the vertical view cutaway drawing of the waste gas purification apparatus of Fig. 1.

The specific embodiment

As shown in Figure 1, waste gas purification apparatus of the present invention comprises: cooling unit 2, dust removing units 5 and absorptive unit 15.Waste gas cooling unit 2 comprises: cooling chamber 12 wherein accommodates cooling fluid 3, for example cooling water; And the waste gas transfer tube 21 that runs through this cooling chamber, wherein transmit high-temp waste gas.This waste gas transfer tube 21 immerses in the cooling fluid 3, so that wherein Chuan Shu high-temp waste gas carries out heat exchange with outside cooling fluid, with cooling down high-temperature waste gas.Many waste gas transfer tubes 21 also can be set in this cooling chamber 12, as shown in Figure 2, be provided with 3 waste gas transfer tubes in the cooling chamber 12, each bar waste gas transfer tube all immerses in the cooling fluid.Can also be provided with cooling-liquid level adjusting device 4 on this cooling chamber 12, it is used for regulating the liquid level of the cooling fluid of cooling chamber, so that waste gas transfer tube 21 immerses in the cooling fluid all the time.This liquid level regulation apparatus 4 links to each other with the cooling fluid supply pipe of outside, when causing the waste gas transfer tube to expose cooling-liquid level when the cooling liquid part consumption in the cooling chamber, open this liquid level device 4,, thereby keep the waste gas transfer tube to immerse in the cooling fluid with supply cooling fluid in cooling chamber.

On the other hand, can seal this cooling chamber 12, and vapour-recovery unit 14 is set thereon,, for example, utilize the steam that reclaims to generate electricity to recycle the steam that cooling fluid produces in cooling down high-temperature waste gas process.This cooling chamber can be partitioned into some compartments, and the top of adjacent compartments can communicate with each other by vapor stream port 13, in order to the circulation and the recovery of steam.The adjacent compartments bottom can be provided with cooling fluid communication port 41 to communicate with each other, and circulates mutually in order to cooling fluid; Yet each compartment also can have its independently liquid level regulation apparatus, and its underpart is not communicated with mutually, thereby can hold different temperatures and/or different types of cooling fluid in each compartment, high-temp waste gas is carried out the segmentation cooling.

The fusing point such as the harmful substance of dioxin (PCDD), TCDD, dioxin etc. that contains in the waste gas is about 88 ℃ to 330 ℃, and it is solid-state at normal temperatures.In order to remove these harmful substances from waste gas, will be arranged on the dust removing units 5 in cooling unit 2 downstreams through the waste gas cooled input, this dust removing units 5 can adopt any dust removing units known in the field.The temperature of waste gas further is reduced to normal temperature to this dust removing units 5 or other are suitable for removing the temperature of dioxin, dioxin, so that the dioxin in the waste gas, dioxin become solid granulates, and the dust in being suspended in waste gas is removed.

Be transfused in the absorptive unit 15 that is arranged on dust removing units 5 downstreams through the waste gas after the dedusting, to remove carbon dioxide and the sulfide that contains in the waste gas.This absorptive unit 15 is an airtight container, wherein accommodates absorption liquid 7, for example, and alkaline solution.For example, use the absorption liquid of limewash as absorbing carbon dioxide and sulfide, after feeding waste gas in the limewash, limewash just with waste gas in carbon dioxide and sulfide react, produce sediment, and from waste gas removal carbon dioxide and sulfide.Between dust removing units 5 and absorptive unit 15, can be provided with pumping installations 6, deliver to the bottom of absorptive unit 15 in order to the waste gas pump that will from dust removing units 5, export, so that waste gas is released in the absorptive unit 15, and promote the removal efficient of carbon dioxide and sulfide under the absorption liquid liquid level.

In order to improve the clearance of carbon dioxide and sulfide, can several absorptive units be set tandem.As example, be provided with two absorptive units among the embodiment shown in Figure 1.Further imported next absorptive unit from the waste gas of previous absorptive unit output, with carbon dioxide and the sulfide in the further removal waste gas.Similarly, also can be provided with pumping installations between the adjacent absorptive unit, to promote the removal efficient of carbon dioxide and sulfide.

Can also be provided with absorption liquid clarifier 17 in the absorptive unit 15, as shown in Figure 2.This absorption liquid clarifier 17 is used for removing the sediment of absorptive unit 15 and replenishes absorption liquid in absorptive unit 15, to keep the absorbability of absorptive unit 15 for carbon dioxide in the waste gas and sulfide.

In absorptive unit 15 downstreams, can also be provided with clean unit 16.Accommodate in this clean unit 16 and purify waste water 8, the waste gas after absorptive unit 15 is handled is transfused in the clean unit 16, with dust and harmful substance remaining in the further removal waste gas.Through the purified treatment of above-mentioned purifier, waste gas promptly can reach the standard of discharging atmosphere.

Whether be purified in order to detect waste gas, can detecting unit 10 be set in clean unit 16 downstreams, the waste gas after being purified by clean unit 16 is by outlet 9 input detection units 10.Be disposed to atmosphere through detecting the floss hole 11 of qualified waste gas by detecting unit 10.

This purifier can also have air reservoir 1, and this air reservoir 1 is an airtight container, is arranged on the upstream side of waste gas cooling unit 2 and is communicated with waste gas transfer tube 21.Before high-temp waste gas is transfused to waste gas transfer tube 21, waste gas can be rested in the air reservoir 1, with the big dust particle in the removal high-temp waste gas, thereby, reduce the purification of its downstream units and bear.

According to above description and 1-2 in conjunction with the accompanying drawings, purification method of the present invention mainly may further comprise the steps: cooling step, high-temp waste gas is imported in the cooling unit 2 so that high-temp waste gas is cooled off; Dust removal step, in cooled waste gas input dust removing units 5 so that the harmful substance that contains in the waste gas changes solid granulates into, and with the harmful substance solid granulates be suspended in dust in the waste gas and come along and remove; Absorption step feeds the waste gas after the dedusting in the absorption liquid that holds in the absorptive unit 15, to absorb carbon dioxide and the sulfide in the waste gas; And purifying step, waste gas is fed in the clean unit 16, with utilization 8 final purifications of realizing waste gas of purifying waste water.

This purification method can also comprise and leave standstill step that it is used for before high-temp waste gas enters cooling step waste gas being statically placed in air reservoir 1, to remove the big dust particle in the waste gas.

Purified treatment by this purifier and purification method, the dust that from the waste gas that combustion furnace is discharged, contains, carbon dioxide, sulfide and can effectively be removed such as the harmful substance of dioxin (PCDD), TCDD, dioxin, thus can effectively reduce such as exhaust gas discharged pollution on the environments such as power plant, incinerator or smelteries.

Claims (15)

1. waste gas purification apparatus comprises:
Cooling unit, the waste gas transfer tube that it has the cooling chamber that holds cooling fluid and runs through cooling chamber and immerse cooling fluid is in order to cool off the waste gas in the input waste gas transfer tube;
Dust removing units, it is arranged at described cooling unit downstream, in order to remove harmful substance and the dust that contains in the waste gas;
Absorptive unit, it is arranged at described dust removing units downstream and accommodates absorption liquid, in order to carbon dioxide and sulfide reaction generation sediment by containing in absorption liquid and the waste gas, and carbon dioxide and sulfide in the removal waste gas; And
Clean unit, it is arranged at described absorptive unit downstream and accommodates and purifies waste water, in order to remove remaining harmful substance and the dust that contains in the waste gas.
2. waste gas purification apparatus as claimed in claim 1, wherein said cooling chamber comprises the cooling-liquid level adjusting device, to regulate the liquid level of the cooling fluid of holding in the cooling chamber, so that described waste gas transfer tube immerses in the cooling fluid all the time.
3. waste gas purification apparatus as claimed in claim 1 or 2, wherein said cooling chamber is an airtight container, it is provided with vapour-recovery unit, to recycle the steam that cooling fluid produces in the cooling exhaust process.
4. waste gas purification apparatus as claimed in claim 3, wherein said cooling chamber comprises a plurality of compartments, adjacent compartments top is provided with the vapor stream port to communicate with each other; The adjacent compartments bottom is provided with the cooling fluid connected entrance to communicate with each other.
5. waste gas purification apparatus as claimed in claim 3, wherein said cooling chamber comprises a plurality of compartments, adjacent compartments top is provided with the vapor stream port to communicate with each other; Adjacent compartments bottom each interval with to each compartment supply different temperatures and/or different types of cooling fluid, is cooled off waste gas is carried out segmentation.
6. waste gas purification apparatus as claimed in claim 1, between wherein said dust removing units and the absorptive unit pumping installations is set, in order to will deliver to the bottom of described absorptive unit, so that waste gas is released in the described absorptive unit under the absorption liquid liquid level from the waste gas pump of described dust removing units output.
7. waste gas purification apparatus as claimed in claim 1, wherein this waste gas purification apparatus comprises the absorptive unit that a plurality of tandems are provided with.
8. waste gas purification apparatus as claimed in claim 7, be provided with pumping installations between the wherein adjacent absorptive unit, will deliver to the bottom of next absorptive unit, so that waste gas is released under the absorption liquid liquid level of this next absorptive unit from the waste gas pump of last absorptive unit output.
9. as each described waste gas purification apparatus among claim 1, the 6-8, wherein said absorptive unit also comprises the absorption liquid clarifier, in order to remove the sediment in the described absorptive unit and replenish absorption liquid in described absorptive unit.
10. waste gas purification apparatus as claimed in claim 1, wherein said absorption liquid are alkaline solution.
11. waste gas purification apparatus as claimed in claim 1, wherein this waste gas purification apparatus also comprises air reservoir, this air reservoir is arranged on described cooling unit upstream, before waste gas is imported cooling unit waste gas is left standstill, to remove the big dust particle in the waste gas.
12. an exhaust gas purifying method may further comprise the steps:
Cooling step is in order to cool off waste gas;
Dust removal step is in order to harmful substance and the dust that contains in the waste gas after the removal cooling processing;
Absorption step is in order to carbon dioxide and the sulfide that contains in the waste gas after the removal dust removal process; And
Purifying step is absorbed the remaining harmful substance and the dust that contain in the waste gas of processing in order to removal.
13. exhaust gas purifying method as claimed in claim 12, wherein said cooling step also comprises the Steam Recovery step, to recycle the steam that produces in the cooling step.
14. exhaust gas purifying method as claimed in claim 13, wherein said absorption step also comprises the absorption liquid purifying step, in order to remove the sediment that produces in the absorption step and to replenish absorption liquid.
15. as each described exhaust gas purifying method in the claim 12 to 14, wherein said exhaust gas purifying method also comprises and leaves standstill step, in order to waste gas is being carried out before the cooling step waste gas being left standstill, to remove the big dust particle that contains in the waste gas.
CNA2007100921209A 2007-04-02 2007-04-02 Exhaust gas purifying device and purification method thereof CN101280926A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007100921209A CN101280926A (en) 2007-04-02 2007-04-02 Exhaust gas purifying device and purification method thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2007100921209A CN101280926A (en) 2007-04-02 2007-04-02 Exhaust gas purifying device and purification method thereof
US11/857,969 US20080236143A1 (en) 2007-04-02 2007-09-19 Waste gas purification apparatus and method therefor

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