CN108126506A - A kind of horizontal semi-dry desulphurization case technology - Google Patents
A kind of horizontal semi-dry desulphurization case technology Download PDFInfo
- Publication number
- CN108126506A CN108126506A CN201711430391.0A CN201711430391A CN108126506A CN 108126506 A CN108126506 A CN 108126506A CN 201711430391 A CN201711430391 A CN 201711430391A CN 108126506 A CN108126506 A CN 108126506A
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- China
- Prior art keywords
- desulfurization
- case
- gas
- flue gas
- fluid bed
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
Abstract
The invention discloses a kind of horizontal semi-dry desulphurization case technologies, flue gas passes through gas inlet first, into desulfurization reactor, the outlet expander section that Venturi throat is connected outside the desulfurization reactor sets a set of water injector, and the atomized water that the water injector sprays into is to reduce the smoke temperature in desulfurization reactor；Subsequent flue gas carries desulfurizing agent and enters desulfurization case, and segmentation case is set inside the desulfurization case, sets fluid bed in every section of bottom of box, the fluid bed is so that SO2With Ca (OH)2Reaction conversion number increase, greatly enhance the heat and mass transport between gas-solid, substantially increase high desulfurization rate；Ash-laden gas lateral discharge at the top of the absorption tower that exhanst gas outlet connects after final purification, then turns to enter desulfurizing dust-collector, then be discharged into chimney by boiler fan.Inventive desulfurization tower reduces materials'use amount, so as to reduce production cost, practical value is high, is worthy to be popularized from the vertical height for becoming horizontal design, greatly reducing desulfurizing tower.
Description
Technical field
The present invention relates to a kind of purifiers and method of combustion apparatus flue gas, belong to flue gases purification field, especially
It is related to a kind of horizontal semi-dry desulphurization case technology.
Background technology
Cyclic semidry process flue gas desulfurization technique is the more advanced flue gas desulfurization technique newly risen in the world in recent years, it
The advantages of relatively low with investing, desulfuration efficiency is relatively high, equipment dependability height, operating cost is relatively low；There is dry method again
The easy-to-handle benefit of product after without sewage discharge, desulfurization and widely paid close attention to by people.But in physical planning according to parameter
During design, calculated according to the reaction time of desulfurizing agent and flue gas, no matter how much handle exhaust gas volumn, desulfurization tower height degree is on 40 meters of left sides
The right side, causes that medium small boiler fume treatment compares wet desulphurization investment and operating cost remains high in this way, high cost and place
Limitation has seriously affected the promotion and application of cyclic semidry process flue gas desulfurization technique.Therefore, in conventional design at this stage half
On the basis of the vertical desulfurizing tower of dry method, the height of desulfurizing tower how is reduced, reducing materials'use amount and improving removal efficiency becomes
One brainstorm subject of prior art.
Invention content
In order to overcome the disadvantages mentioned above of the prior art, the present invention proposes a kind of horizontal semi-dry desulphurization case technology,
Desulfurizing tower is not only made materials'use amount to be reduced, from the vertical height for becoming horizontal design, greatly reducing desulfurizing tower so as to reduce
Production cost, and desulfuration efficiency is improved, practical value is high, is worthy to be popularized.
In order to achieve the above objectives, the technical solution adopted by the present invention is a kind of horizontal semi-dry desulphurization case technology, packet
Include following steps：Flue gas by gas inlet, enters desulfurization reactor, the desulfurization reactor with the flow velocity of 20-30m/s first
The outlet expander section of outer connection Venturi throat sets a set of water injector, and the atomized water that the water injector sprays into is to reduce desulfurization
Smoke temperature in reactor makes smoke temperature be down to higher than 20 DEG C or so of flue gas dew point, with being sufficiently mixed for reinforcing desulfuration agent and flue gas；With
Flue gas carrying desulfurizing agent enters desulfurization case afterwards, and segmentation case is set inside the desulfurization case, and fluid bed is set in every section of bottom of box,
The fluid bed makes the alkaline recycle stock of band rise suspension, after constantly forming floccule, returns still further below, and floccule is in fierceness
Constantly disintegrate again again by gas lift in turbulence so that the slip velocity between gas and solid is up to individual particle slip velocity
More than ten times so that the Ca/S ratios in fluidisation greatly improve, when also further increasing the reaction of granule density and extension of absorbent
Between, so that SO2With Ca (OH)2Reaction conversion number increase, greatly enhance the heat and mass transport between gas-solid, significantly
Improve high desulfurization rate；Ash-laden gas after final purification is laterally discharged at the top of the absorption tower that exhanst gas outlet connects, Ran Houzhuan
Chimney is discharged into desulfurizing dust-collector, then by boiler fan.
Further, flue gas flow rate slows down in the desulfurization case, and the gas of flue gas in the case is 8 seconds with the solid contact time, is had
Effect ground ensures desulfuration efficiency.
Further, the solid particle that the desulfurizing dust-collector traps by the recirculating system under deduster, returns
It goes back to absorption tower to continue to participate in reaction, so recycle, extra a small amount of desulfurization ash is delivered to by material in desulfurization ash cellar, then lead to
It crosses outside tank car or two-stage conveying equipment and arranges.
Further, Ca (OH) in the desulfurization case2With the SO in flue gas2、SO3, HCl, HF complete chemical reaction.
Further, a kind of desulfurizer for realizing semi-dry desulphurization case technology, the desulfurizer include flue gas
Import, desulfurization reactor, Venturi throat, desulfurization case, fluid bed, exhanst gas outlet mutually interconnect successively from flow of flue gas direction
It connects.
Further, the desulfurization reactor tank base is provided with cleaning door, and tank deck necking will ensure gentle slope at 60 ° of angles
More than degree, bore is identical with Venturi throat.
Further, the Venturi throat diameter is taken off by the flow rate set of the 20-30m/s of exhaust gas volumn compared to semidry method
The 50-60m/s of sulphur tower trunnion design current velocity reduces 30m/s or so, greatly reduces the drag losses of system in this way.
Further, the Venturi throat height is set by 1.5 times of throat pipe diameter.
Further, the desulfurization box body design is by exhaust gas volumn+flow velocity+reaction time+fluid bed aerodynamic force height four
Item index determines.Exhaust gas volumn, flow velocity and reaction time determine the length of exhaust gases passes, and fluid bed aerodynamic force height determines every section
The height of babinet, the number of fragments of final determining babinet.
Compared with prior art, the present invention has the following advantages：
1. one-time investment is reduced；
2. difficulty of construction reduces；
3. it is produced in batches suitable for modular；
4. Venturi throat design current velocity declines, process system resistance reduces, and air inducing acc power reduces；
5. equipment processing and fabricating is simple, maintenance and repair is convenient；
6. non-power consumption.
In short, a kind of horizontal circulation semi-dry desulphurization case equipment of our research and designs, flue gas is under ripples type curvilinear flow
It is come into full contact with desulfurizing agent, generates intensely turbulence with mixing, to achieve the purpose that abundant desulfurization, improve desulfuration efficiency；Simultaneously
Desulfurizing tower reduces materials'use amount, so as to reduce production from the vertical height for becoming horizontal design, greatly reducing desulfurizing tower
Cost, practical value is high, is worthy to be popularized.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or it will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 show the appearance schematic diagram of inventive desulfurization case；
Fig. 2 show inventive desulfurization case internal structure schematic diagram.
Specific embodiment
It is described in detail below in conjunction with the technical solution in the embodiment of the present invention：
Referring to shown in Fig. 1, Fig. 2, a kind of desulfurizer for realizing semi-dry desulphurization case technology, the desulfurizer is from flue gas
Flow direction is equipped with gas inlet 1, desulfurization reactor 2, Venturi throat 3, desulfurization case 4, fluid bed 5, exhanst gas outlet 6 successively,
1 tank base of desulfurization reactor is provided with cleaning door 7, and 8 necking of tank deck will ensure gentle slope more than 60 ° of angles, bore
It is identical with Venturi throat 2.2 diameter of Venturi throat presses the flow rate set of the 20-30m/s of exhaust gas volumn, compared to semidry method
The 50-60m/s of desulfurizing tower trunnion design current velocity reduces 30m/s or so, greatly reduces the drag losses of system, trunnion in this way
Highly by 1.5 times of settings of throat pipe diameter；3 cabinet design of desulfurization case presses exhaust gas volumn+flow velocity+reaction time+fluid bed gas
Dynamic height four indices determine, the length of exhaust gases passes is determined by exhaust gas volumn, flow velocity and reaction time, passes through fluid bed
Aerodynamic force height determines the height of every section of babinet, the number of fragments of final determining babinet.
A kind of horizontal semi-dry desulphurization case technology, includes the following steps：Flue gas is first by gas inlet 1, with 20-
The flow velocity of 30m/s enters desulfurization reactor 2, connected outside the desulfurization reactor 2 Venturi throat 3 outlet expander section set it is a set of
Water injector 9, the atomized water that the water injector 9 sprays into make smoke temperature be down to higher than cigarette to reduce the smoke temperature in desulfurization reactor 1
20 DEG C or so of gas dew point, with being sufficiently mixed for reinforcing desulfuration agent and flue gas；Subsequent flue gas carries desulfurizing agent and enters desulfurization case 3, institute
3 inside setting segmentation case of desulfurization case is stated, fluid bed 4 is set in every section of bottom of box, the fluid bed 4 makes the alkaline recycle stock of band
Rise and suspend, after constantly forming floccule, return still further below, and floccule constantly disintegrates again by air-flow in fierce turbulence
It is promoted so that the slip velocity between gas and solid is up to more than ten times of individual particle slip velocity, flue gas stream in the desulfurization case 3
Speed can slow down, and the gas of flue gas in the case and solid contact time are 8 seconds, must fluidize in Ca/S ratios greatly improve, also into
One step increases the reaction time of granule density and extension of absorbent, so that SO2With Ca (OH)2Reaction conversion number add
Greatly, the heat and mass transport between gas-solid is greatly enhanced, substantially increases high desulfurization rate；Ash-laden gas after final purification is from cigarette
Lateral discharge at the top of the absorption tower of 6 connection of gas outlet then turns to enter desulfurizing dust-collector, under the desulfurizing dust-collector trapping
The solid particle come by the recirculating system under deduster, returns to absorption tower and continues to participate in reaction, so recycle, flue gas leads to
It crosses boiler fan and is discharged into chimney, extra a small amount of desulfurization ash is delivered to by material in desulfurization ash cellar, then passes through tank car or two
It is arranged outside grade conveying equipment.
Ca (OH) in desulfurization case2With the SO in flue gas2、SO3, HCl, HF complete chemical reaction.Main chemical reactions
Equation is as follows：
Ca(OH)2+ SO2=CaSO3·1/2 H2O +1/2 H2O
Ca(OH)2+SO3=CaSO4·1/2 H2O +1/2 H2O
CaSO3·1/2 H2O+ 1/2O2=CaSO4·1/2 H2O
Ca(OH)2+ CO2=CaCO3 + H2O
Ca(OH)2+ 2HCl=CaCl2·2H2O（~75 DEG C）（Strong moisture absorption material）
2Ca(OH)2+ 2HCl= CaCl2·Ca(OH)2·2H2O（120 DEG C of ＞）
Ca(OH)2+ 2HF=CaF2 + 2H2O（Equation is answered to can be seen that Ca (OH) from above-mentioned chemistry side2It should as possible avoid 75
DEG C or so reacted with HCl）.
It the above is only the specific embodiment of the application, it is noted that be that those skilled in the art come
It says, under the premise of the application principle is not departed from, several improvements and modifications can also be made, these improvements and modifications also should be regarded as
The protection domain of the application.
Claims (9)
1. a kind of horizontal semi-dry desulphurization case technology, which is characterized in that include the following steps：Flue gas first by flue gas into
Mouthful, desulfurization reactor is entered with the flow velocity of 20-30m/s, the outlet expander section of Venturi throat is connected outside the desulfurization reactor
If a set of water injector, the atomized water that the water injector sprays into makes smoke temperature be down to height to reduce the smoke temperature in desulfurization reactor
In 20 DEG C or so of flue gas dew point, with being sufficiently mixed for reinforcing desulfuration agent and flue gas；Subsequent flue gas carries desulfurizing agent and enters desulfurization case,
Setting segmentation case inside the desulfurization case sets fluid bed in every section of bottom of box, and the fluid bed makes the alkaline recycle stock of band
Rise and suspend, after constantly forming floccule, return still further below, and floccule constantly disintegrates again by air-flow in fierce turbulence
It is promoted so that the slip velocity between gas and solid is up to more than ten times of individual particle slip velocity so that the Ca/S ratios in fluidisation
It greatly improves, also further increases the reaction time of granule density and extension of absorbent, so that SO2With Ca (OH)2It is anti-
Number increasing should be converted, the heat and mass transport between gas-solid is greatly enhanced, substantially increases high desulfurization rate；After final purification
Ash-laden gas lateral discharge at the top of the absorption tower that exhanst gas outlet connects, then turns to enter desulfurizing dust-collector, then pass through boiler
Wind turbine is discharged into chimney.
2. a kind of horizontal semi-dry desulphurization case technology according to claim 1, which is characterized in that in the desulfurization case
Flue gas flow rate slows down, and the gas of flue gas in the case is 8 seconds with the solid contact time.
A kind of 3. horizontal semi-dry desulphurization case technology according to claim 1, which is characterized in that the desulfurization and dedusting
The solid particle that device traps by the recirculating system under deduster, returns to absorption tower and continues to participate in reaction, so follow
Ring, extra a small amount of desulfurization ash are delivered to by material in desulfurization ash cellar, then by being arranged outside tank car or two-stage conveying equipment.
4. a kind of horizontal semi-dry desulphurization case technology according to claim 1, which is characterized in that in the desulfurization case
Ca(OH)2With the SO in flue gas2、SO3, HCl, HF complete chemical reaction.
5. a kind of desulfurizer for realizing horizontal semi-dry desulphurization case technology described in claim 1, which is characterized in that described
Desulfurizer includes gas inlet, desulfurization reactor, Venturi throat, desulfurization case, fluid bed, exhanst gas outlet, from flue gas stream
Dynamic direction is connected with each other successively.
6. desulfurizer according to claim 5, which is characterized in that the desulfurization reactor tank base is provided with deashing
Mouthful, tank deck necking will ensure gentle slope more than 60 ° of angles, and bore is identical with Venturi throat.
7. desulfurizer according to claim 5, which is characterized in that the Venturi throat diameter presses the 20- of exhaust gas volumn
The flow rate set of 30m/s.
8. desulfurizer according to claim 5, which is characterized in that the Venturi throat height is by throat pipe diameter
1.5 times of settings.
9. desulfurizer according to claim 5, which is characterized in that desulfurization box body design by exhaust gas volumn+flow velocity+
Reaction time+fluid bed aerodynamic force height four indices determine.
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| CN201711430391.0A CN108126506A (en) | 2017-12-26 | 2017-12-26 | A kind of horizontal semi-dry desulphurization case technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110721581A (en) * | 2019-09-17 | 2020-01-24 | 上海蓝魂环保科技有限公司 | Marine seawater desulfurization water-gas mixing tower |
| CN111672313A (en) * | 2020-06-09 | 2020-09-18 | 中国科学院过程工程研究所 | Circulating fluidized bed desulfurization device and desulfurization method |
| CN112973385A (en) * | 2021-03-16 | 2021-06-18 | 重庆三鑫环保标志有限公司 | Gas gathering maintenance device for refuse landfill |
| CN113440998A (en) * | 2020-03-24 | 2021-09-28 | 沈阳铝镁设计研究院有限公司 | Novel semi-dry desulfurization device and method |
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