CN106943861A - A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue - Google Patents
A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue Download PDFInfo
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- CN106943861A CN106943861A CN201710252212.2A CN201710252212A CN106943861A CN 106943861 A CN106943861 A CN 106943861A CN 201710252212 A CN201710252212 A CN 201710252212A CN 106943861 A CN106943861 A CN 106943861A
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- flue
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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
- B01D53/46—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
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Abstract
The present invention proposes a kind of removing sulfur trioxide device suitable for large scale section flue, dissolving tank including connection alkali liquor storage tank and dilution water storage tank, large scale section flue is rectangular flue, it is characterized in that, also include dilution mixing weighing distribute module, the alkali liquor storage tank and dilution water storage tank are connected with diluting one end of mixing weighing distribute module respectively, m spray gun is installed on the long side of flue inside the rectangular flue, m >=2, n nozzle is evenly arranged on the spray gun, n >=2, the dilution mixing weighing distribute module between the flue short side and the center line of the spray gun inside m pipeline and the spray gun connection rectangular flue by being provided with apart from L1.The present invention can effectively remove sulfur trioxide, realize reduction air preheater exit gas temperature, reduce air preheater and block burn into reduction upstream device corrosion risk, effectively eliminate " blue smoke " phenomenon.
Description
Technical field
The present invention relates to smoke gas treatment field, more particularly to a kind of removing sulfur trioxide suitable for large scale section flue
Devices and methods therefor.
Background technology
In coal-burning power plant, sulfur-bearing coal generates SO when being burnt in boiler2, in the case of complete burning, there are about 0.5%-
1.5% SO2Oxidable generation SO3；When flue gas flows through heating surface, contain in the flying dust in flue gas or the dust stratification on heating surface
Metal oxide to SO2Certain catalytic action is had, SO is generated3；When flue gas flows through SCR catalyst, V2O5It can be catalyzed about
0.55-1.5% SO2Generate SO3.Particularly in the power plant of burning high sulfur coal, SO3Generation it is very important.
SO in stove by burning and catalyzed conversion is generated3, have serious to safe operation of power plant and atmospheric environment
Harm：SO3Be generate Ammonium hydrogen sulfate main matter, not only can blocking catalyst can also cause denitration efficiency decline, increase cigarette
Gas SR, can cause air preheater to block and force boiler down to clean air preheater when serious；Due to SO3Caused flue gas
Acid dew point is raised, and can make it that exhaust gas temperature and air preheater outlet temperature are raised, be reduced boiler efficiency；SO in smoke evacuation3Concentration is in 35-
70mg/m3When can produce " blue smoke " phenomenon, make the increase of smoke evacuation opacity, and cause Acid Rain Pollution.
To alleviate and eliminating SO3Influence, industry proposes many SO3Control technology, sprays into alkaline matter de- in flue
Except SO3It is proved to be a kind of effective mode.Coal-fired plant flue gas is removed currently for using in duct sorbent injection alkaline matter
Middle SO3Technology had some patents：
Chinese patent CN104474897A proposes a kind of method for removing sulfur trioxide in coal-fired flue-gas, and used is taken off
Except agent and ejection electrodes have described, but without the specific spray regime of explanation；Chinese patent CN103055684A proposes one
The device and technique that sulfur trioxide in flue gas is effectively removed using trona are planted, the eject position and injection apparatus to scavenger are carried out
Explanation, but without illustrating specific spray regime, injector arrangement；Chinese patent CN105854577A proposes one kind
The method and apparatus of sulfur trioxide, is described to arrangement of nozzles position, illustrates in uniform injection alkali lye removing flue gas
The flue gas upstream configuration mixer for well-distribution of nozzle, but without explanation form of nozzle and arrangement form；Chinese patent
CN205109379U, discloses a kind of removing system of sulfur trioxide in coal-fired plant flue gas, it is proposed that injection apparatus need to be passed through
Cooling air, to prevent that absorbent solution from not spraying preceding solidification, it is ensured that atomizing effect, but is not directed to form of nozzle and arrangement shape
Formula；Chinese patent CN205084619U proposes a kind of system for removing sulfur trioxide in power plant soot fume, it is desirable to nozzle
Injection direction flue gas direction is vertical, nozzle and flue sidewall are spaced using solid-cone (type) nozzle and fan nozzle into set angle,
But the form of being arranged so as to, which remains unchanged, is unfavorable for the seamless covering of large scale section flue；Chinese patent CN105233656A is proposed
A kind of technique for being used to remove sulfur trioxide in coal-fired plant flue gas, describes covering of the injection unit in the atomization injection of flue
Rate, but it is not directed to the arrangement of spray pattern and injector.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of removing sulfur trioxide suitable for large scale section flue and filled
Put, include the dissolving tank of connection alkali liquor storage tank and dilution water storage tank, large scale section flue is rectangular flue, and its feature exists
In also including dilution mixing weighing distribute module, the alkali liquor storage tank and dilution water storage tank are distributed with dilution mixing weighing respectively
M spray gun is installed on the long side of flue inside one end connection of module, the rectangular flue, m >=2, the spray gun is arranged in cigarette
N nozzle is evenly arranged on the one or both sides on the long side in road, the spray gun, n >=2, the dilution mixing weighing distribute module is led to
Cross m pipeline and the spray gun connection, installed successively on the pipeline liquid flow regulating valve, filter, fluid flowmeter,
Set between the center line for adjusting the flue short side and the spray gun inside pressure gauge and gas flow regulating valve, the rectangular flue
It is equipped with apart from L1.
Further, the dissolving tank, alkali liquor storage tank and dilution water tank inside are respectively provided with heater.
Further, the interval L4 between the nozzle is 300mm≤L4≤800mm, the center line and cigarette of the spray gun
The distance between road short side L1 is 1/2nd times of interval L4 between nozzle.
Further, the n nozzle is 180 ° of nozzles and several 360 ° of nozzles, and the nozzle, which is installed on, to be abutted
The side of the long side inwall of flue.
Further, m spray gun sets corresponding with the spray gun, m >=2 are installed outside the long side of the flue.
Further, the spray gun sleeve pipe is arranged in the one or both sides on the long side of flue.
Further, the interval L2 between the spray gun sleeve pipe is 500mm≤L2≤1000mm.
Further, the dilution mixing weighing distribute module also includes being connected with the alkali liquor storage tank and dilution water storage tank
Online pipe-line mixer.
The present invention also provides a kind of method for removing sulfur trioxide, it is characterised in that comprise the following steps,
Step 1, by absorbent and dilution water storage tank in dilution water stir in dissolving tank mixed diluting obtain make a reservation for it is dense
The alkali lye of degree, and alkali lye is transported in alkali liquor storage tank；
The dilution water in alkali lye and dilution water storage tank in step 2, alkali liquor storage tank is delivered to dilution mixing weighing point respectively
With being mixed in module；
Step 3, mixed alkali liquor adjusted to predetermined ratio by diluting mixing weighing distribute module, according to spray gun sleeve pipe
Quantity be allocated, according to it is every set spray gun sleeve pipe required for flux of alkaline liquor measured, and simultaneously distribution and metering often cover
Compressed air require needed for spray gun sleeve pipe.
Further, the alkali lye in the step 1 keeps alkali liquid temperature at 30-40 DEG C by the heater in dissolving tank.
A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue that the present invention is provided, can be very
Injection dead band during good solution alkali lye injection removing sulfur trioxide, alkali lye emitted dose skewness and alkali lye consumption amount are big etc.
Problems；By effectively removing sulfur trioxide, effectively reduction acid dew point, reduction air preheater exit gas temperature, drop are realized
Flow velocity improves dust removing effects in low air-introduced machine load, reduction deduster, reduces air preheater and blocks burn into reduction upstream device corrosion
Risk, effectively eliminates " blue smoke " phenomenon.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram for removing sulfur trioxide device suitable for large scale section flue of the present invention；
Fig. 2 is the spray gun mounting arrangements top view in the present invention；
Fig. 3 for the present invention in spray gun mounting arrangements front view.
In figure：1- dissolving tanks, 2- alkali liquor storage tanks, 3- dilution water storage tanks, 4- dilution mixing weighing distribute modules, 4-1- is online
Pipe-line mixer, 4-2- liquid flow regulating valves, 4-3- filters, 4-4- fluid flowmeters, 4-5- regulation pressure gauges, 4-6- gas
Body flow control valve, 5- dissolving pumps, 6- alkali lye delivery pumps, 7- dilution water delivery pumps, 8- rectangular flues, the long side of 8-1- flues, 8-
2- flue short sides, 9- spray guns, 10-1-360 ° of nozzle, 10-2-180 ° of nozzle, 11- spray gun sleeve pipes, 12- agitators, 13- stainless steels
Flexible hose, 14- injection pressure gauges, 15- piping filters, 16- manual ball valves.
Embodiment
Below in conjunction with the accompanying drawings to a kind of removing sulfur trioxide device and its side suitable for large scale section flue of the invention
The embodiment of method is described in detail, and the embodiment is merely to illustrate the model of the present invention rather than the limitation present invention
Enclose, modification of the those skilled in the art to the various equivalent form of values of the present invention falls within what the application appended claims were limited
Scope.
Such as Fig. 1, a kind of removing sulfur trioxide device suitable for large scale section flue, including dissolving tank 1, dissolving tank 1
It is connected respectively with alkali liquor storage tank 2 and dilution water storage tank 3, dissolving tank 1, alkali liquor storage tank 2 and dilution water storage tank 3 are each equipped with heating
Device, heater can use electrical heating, steam-coil-heater or heat-conducting oil heating.Agitator 12, dissolving tank are installed in dissolving tank 1
Dissolving pump 5 is set between 1 and alkali liquor storage tank 2, and alkali liquor storage tank 2 is connected with alkali lye delivery pump 6 and dilution mixing weighing distribution in turn
Online pipe-line mixer 4-1 in module 4, dilution water storage tank 3 is built with industry water as dilution water, and dilution water storage tank 3 is successively
Connect dilution water delivery pump 7 and the online pipe-line mixer 4-1 in dilution mixing weighing distribute module 4, dilution mixing weighing point
With module 4 also including the liquid flow regulating valve 4-2 being successively set on pipeline, filter 4-3, fluid flowmeter 4-4, regulation
Pressure gauge 4-5 and gas flow regulating valve 4-6.
Dilution mixing weighing distribute module 4 is connected with rectangular flue 8, such as Fig. 2, and rectangular flue 8 is by the long side 8-1 of flue and cigarette
Road short side 8-2 is constituted, and m spray gun sleeve pipe 11 is installed on the long side 8-1 of flue, and m >=2, spray gun sleeve pipe 11 is arranged on the long side 8-1 of flue
One or both sides on and go deep into rectangular flue 8, when flue short side 8-2 length be more than 2800mm when, spray gun sleeve pipe 11 is pacified
Interval 500mm≤L2≤1000mm between the long side 8-1 of flue both sides, spray gun sleeve pipe 11.Installed in spray gun sleeve pipe 11
Spray gun 9, it is uniform on spray gun 9 that n is installed according to the quantity and the length of single branch spray gun 9 of flue short side 8-2 Design of length spray gun 9
Interval 300mm≤L4≤800mm between individual nozzle 10, n >=2, nozzle 10, nozzle 10 includes 360 ° of nozzle 10-1 and 180 ° of sprays
Two kinds of mouth 10-2,180 ° of nozzle 10-2 are installed on the side that spray gun 9 abuts flue inner wall, prevent that alkali lye is ejected into flue sidewall,
180 ° of nozzle 10-2 and flue long side wall 8-1 spacing is 0≤L3≤20mm, and 360 ° of nozzle 10-1 can be realized to be covered on a large scale
Lid.The atomized drop that 360 ° of nozzle 10-1 and 180 ° of nozzle 10-2 are ejected simultaneously, forms uniform on the section of rectangular flue 8
Cover and without injection blind area.Such as Fig. 3, the flexible pipe that stainless steel is worked out is installed in one end that spray gun 9 is not connected with rectangular flue 8
13, injection pressure gauge 14, piping filter 15 and manual ball valve 16 are installed successively on flexible pipe 13, piping filter 15 can be prevented
Nozzle 10 is blocked, and spray gun 9 is sprayed using rifle inner tube conveying liquid, rifle outer tube conveying gas with being cooled down by injection with compressed air
Penetrate liquid, it is ensured that liquid does not solidify before atomized spray.The connecting line between tank body, delivery pump, injector in the device is removed
Heat tracing and Insulation are respectively provided with outside compressed air, prevents that absorbent solution from separating out crystallization because of cooling.
The present invention also provides a kind of method that sulfur trioxide is removed using the device, comprises the following steps：Step 1, will inhale
Receiving agent, mixed diluting obtains predetermined concentration in the presence of agitator 12 in dissolving tank 1 with the dilution water in dilution water storage tank 3
Alkali lye, alkali lye keeps alkali liquid temperature to be transported at 30-40 DEG C, and by alkali lye by dissolving pump 5 by the heater in dissolving tank 1
In alkali liquor storage tank 2；Dilution water in step 2, the alkali lye in alkali liquor storage tank 2 and dilution water storage tank 3 is delivered to by delivery pump respectively
Mixed in online pipe-line mixer 4-1；Mixed alkali liquor in step 3, online pipe-line mixer 4-1 is by diluting mixing meter
Amount distribute module 4 is adjusted to predetermined ratio, is allocated according to the quantity of spray gun sleeve pipe 11, according to every institute of set spray gun sleeve pipe 11
The flux of alkaline liquor needed is measured, and distributes and measure compressed air require often needed for set spray gun sleeve pipe 11 simultaneously.
By taking certain 600MW unit as an example, into 2 parallel connection SCR (SCR) reactors total exhaust gas volumn for 2 ×
113.5 ten thousand Nm3The size of/hr, SCR reactor afterbody rectangular flue 8 is 4200x9206.The long 4200mm of flue short side 8-2, using 2
Side is installed by the joint covering of spray gun 9 of 34 2.6m length.Flue length of side 8-1 both sides interval L2=1000mm uniformly installs 34 spray guns
Sleeve pipe 11, corresponds the supporting installation long spray gun 9 of 34 sets of multiinjectors, and it is 2000mm, configuration often to cover the length in flue of spray gun 9
Spacing L3=300mm between 6 360 ° nozzle 10-1 and 1 180 ° of nozzle 10-2, nozzle 10, sprays coverage rate 200%.
In this example, what is be connected with every spray gun 9 is respectively stainless steel establishment flexible pipe 13, stainless steel injection pressure gauge
14th, stainless steel filter 15 and stainless steel manual ball valve 16, above part and 360 ° of nozzle 10-1,180 ° of nozzle 10-2 and spray gun
Sleeve pipe 11, constitutes a set of injector；Be connected with 34 sets of injectors in dilution mixing weighing module 4 be configured with it is corresponding number of
Distribution and computation equipment, including liquid flow regulating valve 4-2, piping filter 4-3, flowmeter 4-4,4-5 regulation pressure gauge.It is all
The part contacted with alkali lye such as dissolving tank 1, alkali liquor storage tank 2 and dilution water storage tank 3, agitator 12 etc. use stainless steel,
Prevent corrosion.According to jet face flue gas flow field situation and SO3Concentration Testing situation analysis and the alkali lye injection for configuring respective regions
Amount, has reached SO3Higher eliminating efficiency.
A kind of removing sulfur trioxide device suitable for large scale section flue of the invention uniformly sprays absorbent alkali lye
It is distributed in flue cross section, injection blind area is avoided on the premise of coverage rate is ensured, so that three oxidation in efficient removal flue gas
Sulphur, ensures absorbent alkali lye being uniformly distributed on injection section, also together by the injector flow of separated regions independent control
When " distribution according to need " ensure that alkali lye is reacted in the case of being in appropriate excess with sulfur trioxide in flue gas, prevent because of locally three
Sulfur oxide concentration is high and generates hydrosulphate.Using the form of 180 ° of nozzles and 360 ° of Nozzle combinations, mode alkali lye is ejected into
Flue inner wall is caused to corrode and wasted, and the covering of jet face well can be realized again.
The present invention can be very good to solve injection dead band, the distribution of alkali lye emitted dose during alkali lye injection removing sulfur trioxide
The problems such as uneven and alkali lye consumption amount is big.By effectively removing sulfur trioxide, realize that effectively reduction acid dew point, reduction are empty
Pre- device exit gas temperature, reduction air-introduced machine load, flow velocity improves dust removing effects in reduction deduster, reduces air preheater and blocks rotten
Erosion, reduction upstream device corrosion risk, effectively eliminate " blue smoke " phenomenon.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
Claims (10)
1. a kind of removing sulfur trioxide device suitable for large scale section flue, including connection alkali liquor storage tank (2) and dilution water
The dissolving tank (1) of storage tank (3), large scale section flue is rectangular flue (8), it is characterised in that also including dilution mixing
Distribute module (4) is measured, the alkali liquor storage tank (2) and dilution water storage tank (3) are respectively with diluting mixing weighing distribute module (4)
One end is connected, and the rectangular flue (8) installs m spray gun (9), m >=2, the spray gun (9) on the internal long side of flue (8-1)
It is arranged on the one or both sides on the long side of flue (8-1), the spray gun (9) and is evenly arranged n nozzle (10), n >=2 is described dilute
Release mixing weighing distribute module (4) to connect by m pipeline and the spray gun (9), liquid flow is installed successively on the pipeline
Adjustable valve (4-2), filter (4-3), fluid flowmeter (4-4), regulation pressure gauge (4-5) and gas flow regulating valve (4-
6), it is provided between the internal flue short side (8-2) of the rectangular flue (8) and the center line of the spray gun (9) apart from L1.
2. the removing sulfur trioxide device according to claim 1 suitable for large scale section flue, it is characterised in that institute
State and be respectively provided with heater inside dissolving tank (1), alkali liquor storage tank (2) and dilution water storage tank (3).
3. the removing sulfur trioxide device according to claim 1 suitable for large scale section flue, it is characterised in that institute
It is 300mm≤L4≤800mm to state interval L4 between nozzle (10), the center line and flue short side (8-2) of the spray gun (9) it
Between apart from L1 be nozzle (10) between be spaced 1/2nd times of L4.
4. the removing sulfur trioxide device according to claim 1 suitable for large scale section flue, it is characterised in that institute
N nozzle (10) is stated for 180 ° of nozzles (10-2) and several 360 ° of nozzles (10-1), the nozzle (10-2) is installed on
Against the side of the long side of the flue (8-1) inwall.
5. the removing sulfur trioxide device according to claim 1 suitable for large scale section flue, it is characterised in that institute
State and installed outside the long side of flue (8-1) m spray gun sleeve pipes (11) corresponding with the spray gun (9), m >=2.
6. the removing sulfur trioxide device according to claim 5 suitable for large scale section flue, it is characterised in that institute
State the one or both sides that spray gun sleeve pipe (11) is arranged in the long side of flue (8-1).
7. the removing sulfur trioxide device suitable for large scale section flue according to claim 5 or 6, its feature exists
In the interval L2 between the spray gun sleeve pipe (11) is 500mm≤L2≤1000mm.
8. a kind of device for removing sulfur trioxide according to claim 1, it is characterised in that the dilution mixing weighing point
Also include the online pipe-line mixer (4-1) being connected with the alkali liquor storage tank (2) and dilution water storage tank (3) with module (4).
9. a kind of method that sulfur trioxide is removed using device as claimed in claim 1, it is characterised in that including following step
Suddenly,
Step 1, by absorbent, the stirring mixed diluting in dissolving tank (1) is made a reservation for the dilution water in dilution water storage tank (3)
The alkali lye of concentration, and alkali lye is transported in alkali liquor storage tank (2)；
The dilution water in alkali lye and dilution water storage tank (3) in step 2, alkali liquor storage tank (2) is delivered to dilution mixing weighing respectively
Mixed in distribute module (4)；
Step 3, mixed alkali liquor adjusted to predetermined ratio by diluting mixing weighing distribute module (4), according to spray gun sleeve pipe
(11) quantity is allocated, and is measured according to the flux of alkaline liquor required for every set spray gun sleeve pipe (11), and distribute simultaneously and
The compressed air require of metering often needed for set spray gun sleeve pipe (11).
10. a kind of method for removing sulfur trioxide according to claim 9, it is characterised in that the alkali lye in the step 1
Alkali liquid temperature is kept at 30-40 DEG C by the heater in dissolving tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710252212.2A CN106943861A (en) | 2017-04-18 | 2017-04-18 | A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710252212.2A CN106943861A (en) | 2017-04-18 | 2017-04-18 | A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue |
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| Publication Number | Publication Date |
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| CN106943861A true CN106943861A (en) | 2017-07-14 |
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ID=59477164
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710252212.2A Pending CN106943861A (en) | 2017-04-18 | 2017-04-18 | A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110801723A (en) * | 2019-10-17 | 2020-02-18 | 浙江浙能技术研究院有限公司 | Method for removing SO in coal-fired flue gas by base injection3Pilot test device and method |
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| CN110801723A (en) * | 2019-10-17 | 2020-02-18 | 浙江浙能技术研究院有限公司 | Method for removing SO in coal-fired flue gas by base injection3Pilot test device and method |
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