CN106336908A - Ash handling system with coal gasification dry method and ash handling method - Google Patents
Ash handling system with coal gasification dry method and ash handling method Download PDFInfo
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- CN106336908A CN106336908A CN201611013368.7A CN201611013368A CN106336908A CN 106336908 A CN106336908 A CN 106336908A CN 201611013368 A CN201611013368 A CN 201611013368A CN 106336908 A CN106336908 A CN 106336908A
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- flying dust
- tank
- ash
- fly
- disposal system
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- 238000002309 gasification Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000003245 coal Substances 0.000 title abstract description 18
- 239000002956 ash Substances 0.000 claims abstract description 75
- 239000010881 fly ash Substances 0.000 claims abstract description 54
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 44
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 30
- 239000000428 dust Substances 0.000 claims description 174
- 239000007789 gas Substances 0.000 claims description 99
- 239000003570 air Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 2
- 239000003034 coal gas Substances 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 17
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 12
- 238000001816 cooling Methods 0.000 description 11
- 239000012065 filter cake Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000012432 intermediate storage Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003276 anti-hypertensive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/024—Dust removal by filtration
Abstract
The invention discloses an ash handling system with coal gasification method and an ash handling method, and the ash handling system comprises a fly-ash filter, a fly-ash gathering tank, a fly-ash discharging tank and a fly-ash warehouse which are connected in sequence, wherein the fly-ash gathering tank is arranged in the bottom of the fly-ash filter, a synthesis gas outlet pipe is arranged on the top of the fly-ash filter, and the synthesis gas outlet pipe is connected to a wet-cleaning unit, the top of the fly-ash filter is also connected to a high pressure blowback air pipe. The ash handling system also comprises a decompressor and a gas buffer tank, wherein the bottom of the fly-ash discharging tank is directly connected to the fly-ash warehouse through the decompressor, the gas buffer tank is connected to the bottom of the fly-ash discharging tank and is used for introducing high pressure gas to the fly-ash discharging tank, and a first discharging control valve is arranged between the fly-ash gathering tank and the fly-ash discharging tank, and a second discharging control valve is arranged between the fly-ash discharging tank and the decompressor. The ash handling system with coal gasification method and the ash handling method solve the problems of high equipment investment and complex operation brought by diverse and complicated processes in prior ash handling process with dry method.
Description
Technical field
The present invention relates to a kind of gasification dry ash disposal system and a kind of process for deashing.
Background technology
, as one of most important Fossil fuel, Coal Gasification Technology is applied to generate electricity and chemical products production is inevitable for coal
Selection, be a kind of very important cleaning coal utilization technology.Air-flow bed coal-gasification technology is cleaning relatively advanced in the world
One of Coal Gasification Technology, its main advantage is that coal adaptability is wide, it is big to produce intensity, structure design is simple and close
100% efficiency of carbon con version etc..Coal gasification course is a thermochemical process.It is with coal as raw material, (air, oxygen-enriched with oxygen
Or pure oxygen), vapor or hydrogen etc. make gasifying agent (or claiming gasifying medium), complete to heat up within the extremely of short duration time, volatilization
Divide series of physical and the chemical processes such as removing, cracking, burning and conversion.Because gasification in-furnace temperature is very high, in aerobic conditions
Under, carbon, volatile matters and partial reaction product (h2With co etc.) to occur based on combustion reaction, to occur after oxygen is depleted
The various conversion reactions of carbon, i.e. the gasification reaction stage, ultimately form with h2Leave gasification furnace with co for the synthesis gas of main component.
In gasification, the minerals in coal a series of physical chemistry such as can decompose, melt, gasifying, condensing, condensing, reuniting becomes
Change, then form chemical composition and the flying dust coming in every shape at low temperature.These flying dusts are synthesized gas and carry entrance downstream units secretly,
Need to carry out ash disposal process.
Common dedusting process has wet ash removal and two kinds of dry method ash disposal.Wherein, shell dry powder pressurized gasification technology, U.S.
State's kbrtrigtm Coal Gasification Technology, u-gas gasification technology, two sections of dry coal powder airflow bed gasification technologies of Xi'an hot working research institute etc.
All employ dry method ash discharge technology.That is, the flying dust that coal gasification produces draws gasification furnace with synthesis gas, initially with fly-ash filter
Carry out dry method ash disposal, the most dust-filterings in the synthesis gas that gasification furnace is generated by filter fall, and make synthesis gas reach one
Enter back into after fixed standard and wash unit and wash further.
Fig. 1 gives the schematic flow sheet of the dedusting process of shell dry powder pressurized gasification technology: from coal gasification gasification furnace
The crude synthesis gas of bearing both solid dust initially enter ceramic filter and carry out dedusting, and the synthesis gas after filtration is through filter
Upper gas outlet is delivered to and is washed operation, and the dust carried secretly in crude synthesis gas is gathered in be become on ceramic filter filter element outer wall
Filter cake, filter cake is in n2Blowback effect is fallen in the collecting tank of lower vessel portion and is discharged by flying dust outlet.The flying dust discharged
Experience transformation process in emptying tank, pressure transits to atmospheric pressure state by high pressure (～4.0mpa).In discharging cooling tank a and discharging
In cooling tank b, using low-temp low-pressure n2Flying dust is stripped.Flying dust after stripping enters the inflation of inflation storehouse through intermediate storage tank,
Eventually enter into warehouse.
Wherein, by emptying tank transformation is played with antihypertensive effect in this technique, discharging cooling tank a and discharging cooling tank b is real
Fluid bed effect is played on border, intermediate storage tank interim storage flying dust, inflation storehouse are as flying dust material issuing tank.The master of discharging cooling tank a and b
Want function to be after flying dust is drained in discharging cooling tank a and b after the emptying tank blood pressure lowering, be filled with low temperature (～80 DEG C) low pressure gas
Body (n2Or co2) flying dust is stripped.Stripping effect show themselves in that (1) reduce in gas-particle two-phase harmful gass in gas phase point
Pressure, so that harmful gass parse, reaches the purpose of removing harmful gass, the waste gas removing dust device of removing from the surface of solids
Mix with fuel gas after filtration and send torch burning, reach the purpose of qualified discharge.(2) reduce the temperature of flying dust with cryogenic gas,
Flying dust viscosity is reduced, is conducive to ash discharge and storage.In this dry removal technique, filter, collecting tank and emptying tank are high
Pressure condition, and discharging cooling tank and its upstream device are all atmospheric pressure states, therefore emptying tank plays and is transitted to flying dust by high pressure
The effect of normal pressure.
Compared with wet ash removal technique, dry method ash disposal have cycling use of water and quantity of wastewater effluent few, purify after dust dust-laden
Series of advantages that amount is low, environmental benefit is high etc., but this technique there is also that investment is big, maintenance and operation high cost the problems such as.With
As a example the dedusting process of shell dry powder pressurized gasification technology, it uses a kind of similar many batch cans batch turning mode, and flying dust is from height
Press through filter and be provided with multiple batch cans between normal pressure warehouse, specifically include collecting tank, emptying tank, 2 discharging cooling tanks, centres
Storage tank and inflation storehouse, above-mentioned tank body is huge, and from several cubic metres to several hectosteres, and each batch can is required for joining volume
The standby equipment such as corresponding surge tank and cleaner unit (omission process made in FIG by surge tank and cleaner unit).This technological process is tired of
Superfluous, and the investment of a whole set of dry method ash disposal unit is very huge.
Content of the invention
Present invention seek to address that technical problem be to overcome flying dust dry removal complex process of the prior art, equipment
Investment is big, the defect of operation and maintenance high cost, and provides a kind of gasification dry ash disposal system and a kind of process for deashing.This
Invention is intended to optimize existing gasification dry dedusting process, and the equipment investment that the diverse and complicated flow process of solution is brought is huge, complex operation
The problems such as, promote the long-period stable operation of a whole set of gasification system.
The invention provides a kind of gasification dry ash disposal system, described gasification dry ash disposal system includes being sequentially communicated
A fly-ash filter, a flying dust collecting tank, a flying dust emptying tank and a flying dust warehouse, described flying dust collecting tank flies located at described
The bottom of grey filter, the top of described fly-ash filter is additionally provided with a syngas outlet pipe, described syngas outlet pipe also with
One washes unit is connected, the top of described fly-ash filter also with a high pressure blowback air pipeline communication, for described flying dust mistake
Conveying high-pressure blowback air in filter, its feature is, described gasification dry ash disposal system also includes a decompressor and a gas
Surge tank, the bottom of described flying dust emptying tank is joined directly together with described flying dust warehouse by described decompressor, described gas buffer
Tank is connected with the bottom of described flying dust emptying tank, and for being passed through gases at high pressure in described flying dust emptying tank, described flying dust is received
It is additionally provided with one first blanking control valve, between described flying dust emptying tank and described decompressor between collection tank and described flying dust emptying tank
It is additionally provided with one second blanking control valve.
It is preferred that described gasification dry ash disposal system also includes the crude synthesis gas feed pipe being connected with a gasification furnace
Road, described crude synthesis gas feed pipe is used for connecting the bottom of described gasification furnace and described fly-ash filter, thus will slightly synthesize
Gas is delivered in described fly-ash filter.
Wherein, the type of furnace of described gasification furnace is not particularly limited.It is preferred that described gasification furnace and described crude synthesis gas charging
It is additionally provided with a heat exchanger between pipeline, reach the purpose of cooling crude synthesis gas.The heat exchange mode of described heat exchanger does not limit, and can adopt
Heat exchange can also be carried out by waste heat boiler with the mode of water Quench.
In the present invention, it is preferred that being respectively arranged with one first material on described flying dust collecting tank and described flying dust emptying tank
Level sensor and one second level sensor.The effect of level sensor is to be easy to monitor in real time flying dust collecting tank and flying dust is put
Flying dust piling height in batch can.
In the present invention, described gasification dry ash disposal system is preferably also provided with an ash disposal system control module, and described
The control signal input of the control signal outfan described ash disposal system control module of connection of one level sensor, described first
The control signal input of blanking control valve connects the control signal outfan of described ash disposal system control module.Described second material
The control signal outfan of level sensor connects the control signal input of described ash disposal system control module, described second blanking
The control signal input of control valve connects the control signal outfan of described ash disposal system control module.
In the present invention, described fly-ash filter is High Temperature High Pressure ceramic filter commonly used in the art, by pressure resistant vessel and
Internals (filter element) two parts form, and comprise additionally in purge gas ring pipe, valve, instrument and control device etc..
It is preferred that described gas buffer tank connects also by the bottom of one first orifice flowmeter and described flying dust collecting tank
Logical.The actual pressure flowing through the gases at high pressure of described first orifice flowmeter is related to actual process.Usually, when gasification furnace pressure
When power is 4.0mpa, the pressure 5.20mpa of gases at high pressure.
It is preferred that described gas buffer tank is connected with the bottom of described flying dust emptying tank by one second orifice flowmeter.
The actual pressure flowing through the gases at high pressure of described second orifice flowmeter is related to actual process.Usually, when gasification furnace pressure
During for 4.0mpa, the pressure 5.20mpa of gases at high pressure.
Conventional according to this area, the actual pressure of high pressure blowback air is also related to actual process.Usually, when gasification furnace pressure
When power is 4.0mpa, the pressure 7.8mpa of high pressure blowback air.High pressure blowback air is generally air pulse, and its effect includes: will fly
Ash falls in flying dust collecting tank, the filter element of cleaning fly-ash filter.
In the present invention, technological process in tank body for the flying dust is described as follows: from coal gasifier bearing both solid dust
Crude synthesis gas, are delivered at supervisor's plate by High Temperature High Pressure fly-ash filter bottom feed pipe and riser.Filtered by flying dust again
Micropore in device element wall enters in filter element.Synthesis gas after filtration from bottom to top enters the top of container, then through container
The syngas outlet pipe on top deliver to and wash unit；The dust carried secretly in crude synthesis gas is gathered in outside the filter element of fly-ash filter
On wall, the dust being gathered on fly-ash filter filter element outer wall becomes filter cake, and these filter cakes will be removed by high pressure blowback air, instead
Blowing adverse current and under, enter filter element in, flying dust filter core is blown away by the micropore in fly-ash filter element wall
The filter cake of outer wall, finally, filter cake, in the ash bucket that blow-back effect falls into lower vessel portion, is discharged by flying dust outlet and is held
Device.
The present invention passes through to arrange fly-ash filter and the flying dust collecting tank connecting successively, flying dust blowing with fly-ash filter
Crude synthesis gas from gasification furnace bearing both solid dust are removed by tank, decompressor and flying dust warehouse using fly-ash filter
Ash, the synthesis gas entrance after filtration is washed unit and is purified further, and the flying dust producing during ash disposal enters flying dust collecting tank, continues
And be drained in flying dust emptying tank, using Pneumatic Conveying Technology, flying dust is delivered to by flying dust emptying tank under certain pressure differential
In flying dust warehouse.Wherein, the present invention actual employ gas buffer tank and gases at high pressure loose, fluidisation purging existing to replace
Two discharging cooling tanks, concrete mechanism is: gases at high pressure enter flying dust emptying tank through gas buffer tank, fully flying dust are entered
Row is loose, fluidisation, reaches displacement, the effect of cooling.
In the present invention, it is passed through gases at high pressure from the bottom of flying dust emptying tank, the effect being passed through gas includes but is not limited to: a,
The synthesis gas of the part flying dust surface of solids can be parsed, reach the purpose of removing synthesis gas；B, utilize gas and flying dust
Temperature difference come to reduce flying dust temperature so that flying dust viscosity reduce, be conducive to ash discharge and storage；C, be used for flying dust blowing pressure tank
Regulation and control；Flying dust in d, loose, streaming tank, is conducive to fly ash emission and conveying.Emptying tank bear simultaneously fluid bed and
The effect of transfer pot, carries before transporting and flying dust is carried out fluidizing, is replaced by gas, reach the purpose of gas；After fully fluidizing
As conveying source, carry out Pneumatic Conveying Technology.
In the present invention, the purpose that transfer pipeline arranges decompressor is that the structure first shrinking further expansion using decompressor is special
Levy and its drag characteristic, replace traditional batch can batch turning mode, can the high pressure conditions transition in collecting tank by flying dust effectively
Atmospheric pressure state in flying dust warehouse.Described decompressor is preferably a Venturi tube.Venturi tube is first shunk and to be expanded afterwards
Architectural feature one side effectively can set up effective resistance drop in conveyance conduit, on the other hand will not deteriorate Gas-particle Flows,
Transition from high pressure to atmospheric pressure state for the flying dust can effectively be realized, realize the replacement to traditional many batch cans batch turning mode.
Present invention also offers a kind of process for deashing, described process for deashing is entered using above-mentioned gasification dry ash disposal system
OK, it comprises the steps:
S1: crude synthesis gas are delivered in described fly-ash filter, the synthesis gas after filtration from bottom to top enters described flying
The top of grey filter, then through described syngas outlet pipe be delivered to described in wash unit；
S2: the dust carried secretly in crude synthesis gas falls into the bottom of described fly-ash filter in the presence of high pressure blowback air
In flying dust collecting tank；
S3: described flying dust emptying tank is carried out being pressurized to the pressure balance of described flying dust collecting tank using gases at high pressure；
S4: open described first blanking control valve after the material position of flying dust collecting tank reaches 50%～70%, make under flying dust
Expect to described flying dust emptying tank；
S5: when the material position of flying dust emptying tank reach to a certain degree 50%～70% after, close described first blanking control valve,
Then be passed through gases at high pressure to the bottom of described flying dust emptying tank, to flying dust emptying tank pressure be 0.5～4mpa when, open institute
State the second blanking control valve, flying dust is delivered in described flying dust warehouse by described flying dust emptying tank；
S6: after the completion of conveying, close described first blanking control valve and described second blanking control valve；
S7: be passed through gases at high pressure in described flying dust emptying tank, make the air pressure in described flying dust emptying tank and described flying dust
Collecting tank balances each other, and then opens described first blanking control valve, carries out ash operation next time.
In the present invention, it is the crude synthesis gas of the conventional bearing both solid dust in this area in described crude synthesis gas.Enter
Generally 340 DEG C about of the temperature of the crude synthesis gas of described fly-ash filter, pressure generally 4.0mpa about.
In the present invention, described gases at high pressure are preferably compressed air, nitrogen or carbon dioxide.
In the present invention, described high pressure blowback air is preferably synthesis gas.
On the basis of meeting common sense in the field, above-mentioned each optimum condition, can combination in any, obtain final product each preferable reality of the present invention
Example.
The positive effect of the present invention is: the present invention, on the basis of existing dry method dedusting process, is simplified
And optimization, on the one hand decrease batch can number (supporting surge tank, cleaner unit also accordingly reduce), on the other hand adopt decompressor
To discharge pressure, to shorten flow process, saved equipment investment；The ash disposal system of the present invention and method are applied to Coal rank, no
Same vapor pressure, the gasification installation of the different gasification furnace type of furnace.The gasification dry ash disposal system that the present invention provides is easily achieved, and has
Beneficial to equipment for gasification long-period stable operation.
Brief description
Fig. 1 is the process chart of the dedusting process of shell dry powder pressurized gasification technology of the prior art.
Fig. 2 is the structural representation of the gasification dry ash disposal system of the embodiment of the present invention 1.
Description of reference numerals is as follows:
Fly-ash filter 1
High pressure blowback feed channel 101
Syngas outlet pipe 102
Flying dust collecting tank 2
Flying dust emptying tank 3
Gasification furnace 4
Crude synthesis gas feed pipe 401
Gas buffer tank 5
First orifice flowmeter 501
Second orifice flowmeter 502
Wash unit 6
Ash disposal system control module 7
First level sensor 701
First blanking control valve 702
Second level sensor 703
Second blanking control valve 704
Decompressor 8
Flying dust warehouse 9
Specific embodiment
Further illustrate the present invention below by the mode of embodiment, but therefore do not limit the present invention to described reality
Apply among a scope.The experimental technique of unreceipted actual conditions in the following example, conventionally and condition, or according to business
Product description selects.
Embodiment 1
Present embodiments provide a kind of gasification dry ash disposal system, as shown in Fig. 2 described gasification dry ash disposal system
Including the fly-ash filter 1 being sequentially communicated, a flying dust collecting tank 2, a flying dust emptying tank 3 and a flying dust warehouse 9, described flying dust
Collecting tank 2 is additionally provided with a syngas outlet pipe located at the bottom of described fly-ash filter 1, the top of described fly-ash filter 1
102, described syngas outlet pipe 102 also washes unit 6 and is connected with one, and the top of described fly-ash filter 1 is also anti-with a high pressure
Gassing pipe 101 connects, for conveying high-pressure blowback air in described fly-ash filter 1, described gasification dry ash disposal system
Also include a decompressor 8 and a gas buffer tank 5, described decompressor 8 and described flying dust are passed through in the bottom of described flying dust emptying tank 3
Warehouse 9 is joined directly together, and described gas buffer tank 5 is connected with the bottom of described flying dust emptying tank 3, for described flying dust blowing
It is passed through gases at high pressure in tank 3, between described flying dust collecting tank 2 and described flying dust emptying tank 3, be additionally provided with one first blanking control valve
702, it is additionally provided with one second blanking control valve 704 between described flying dust emptying tank 3 and described decompressor 8.
Described gasification dry ash disposal system also includes the crude synthesis gas feed pipe 401 being connected with a gasification furnace 4, institute
State crude synthesis gas feed pipe 401 for connecting the bottom of described gasification furnace 4 and described fly-ash filter 1, thus will slightly synthesize
Gas is delivered in described fly-ash filter 1.
One first level sensor 701 and is respectively arranged with described flying dust collecting tank 2 and described flying dust emptying tank 3
Second level sensor 703.Described gasification dry ash disposal system is additionally provided with an ash disposal system control module 7, described first material
The control signal input of the control signal outfan described ash disposal system control module 7 of connection of level sensor 701, described first
The control signal input of blanking control valve 702 connects the control signal outfan of described ash disposal system control module 7；Described
The control signal outfan of two level sensors 703 connects the control signal input of described ash disposal system control module 7, described
The control signal input of the second blanking control valve 704 connects the control signal outfan of described ash disposal system control module 7.
Described gas buffer tank 5 is connected with the bottom of described flying dust collecting tank 2 also by one first orifice flowmeter 501；
When gasification furnace 4 pressure is 4.0mpa, to the pressure 5.20mpa of the gases at high pressure of the bottom input of described flying dust collecting tank 2；Institute
State gas buffer tank 5 to connect with the bottom of described flying dust emptying tank 3 by one second orifice flowmeter 502；When gasification furnace 4 pressure
During for 4.0mpa, to the pressure 5.20mpa of the gases at high pressure of the bottom input of described flying dust emptying tank 3.When gasification furnace 4 pressure is
During 4.0mpa, the pressure 7.8mpa of high pressure blowback air.
In the present embodiment, described decompressor 8 is a Venturi tube.
In the present embodiment, described dry method process for deashing comprises the steps:
S1: from the crude synthesis gas of coal gasification gasification furnace 4 bearing both solid dust, by fly-ash filter 1 element wall
Micropore enter in filter element, the synthesis gas after filtration from bottom to top enters the top of container, then goes out through the synthesis gas of container
Mouth pipe 102 is delivered to and is washed unit 6.
S2: the dust carried secretly in crude synthesis gas is gathered in becomes filter cake, in blow-back on fly-ash filter 1 filter element outer wall
Effect falls in the flying dust collecting tank 2 of lower vessel portion.
S3: flying dust emptying tank 3 is carried out be pressurized to flying dust collecting tank 2 using the gases at high pressure from gas buffer tank 5 and press
Dynamic balance.
S4: open the first blanking control valve on blanking pipeline after the material position of flying dust collecting tank 2 reaches 50%～70%
702, the flying dust producing during ash disposal enters flying dust emptying tank 3.In order to ensure gasification system stable operation, receive opening flying dust
It is to be ensured that both pressure are basically identical before the first blanking control valve 702 between collection tank 2 and flying dust emptying tank 3, flying dust is in gravity
Effect is lower to enter flying dust emptying tank 3.
S5: after the material position of flying dust emptying tank 3 reaches 50%～70%, close under first being connected with flying dust collecting tank 2
Material control valve 702.Then it is passed through gases at high pressure to the bottom of described flying dust emptying tank 3, the pressure to flying dust emptying tank 3 is 0.5
During～4mpa, open described second blanking control valve 704, flying dust is delivered to described flying dust warehouse 9 by described flying dust emptying tank 3
In.
S6: after the completion of conveying, close the first blanking control valve 702 on transfer pipeline and described second blanking control valve
704.
S7: be pressurized to flying dust emptying tank 3 by the gases at high pressure from gas buffer tank 5, make flying dust emptying tank 3
Interior air pressure is balanced each other with flying dust collecting tank 2, then opens the first blanking control between flying dust collecting tank 2 and flying dust emptying tank 3
Valve 702 processed, carries out ash work next time.
When the flying dust in flying dust emptying tank 3 saves bit by bit setting height, the second level sensor 703 will send a signal to ash disposal
System control module 7, ash disposal system control module 7 controls the first blanking between flying dust collecting tank 2 and flying dust emptying tank 3 first
Control valve 702 is closed, and makes flying dust collecting tank 2 completely isolated with flying dust emptying tank 3, is then made by the feed adjustment of gases at high pressure
The pressure of flying dust emptying tank 3 is down to suitable transportation horizontal.This pressure value arranges with flying dust physical property, transfer pipeline and decompressor 8 is tied
Structure is related.
The present invention is possible with dust stratification timer and carries out timing, calculates crude synthesis gas ash disposal processing routine run time, when
When run time reaches setting time, open/close flying dust collecting tank 2 and flying dust emptying tank 3 by ash disposal system control module 7
Between setting the first blanking control valve 702, carry out dry method remove ash manipulation.
Claims (10)
1. a kind of gasification dry ash disposal system, the flying dust that described gasification dry ash disposal system includes being sequentially communicated filters
Device, a flying dust collecting tank, a flying dust emptying tank and a flying dust warehouse, described flying dust collecting tank is located at the bottom of described fly-ash filter
Portion, the top of described fly-ash filter is additionally provided with a syngas outlet pipe, and described syngas outlet pipe also washes unit phase with one
Even, the top of described fly-ash filter also with a high pressure blowback air pipeline communication, high for conveying in described fly-ash filter
Pressure blowback air is it is characterised in that described gasification dry ash disposal system also includes a decompressor and a gas buffer tank, described winged
The bottom of grey emptying tank is joined directly together with described flying dust warehouse by described decompressor, and described gas buffer tank and described flying dust are put
The bottom of batch can is connected, for being passed through gases at high pressure in described flying dust emptying tank, described flying dust collecting tank and described flying dust
It is additionally provided with one first blanking control valve between emptying tank, be additionally provided with one second between described flying dust emptying tank and described decompressor
Material control valve.
2. gasification dry ash disposal system as claimed in claim 1 it is characterised in that described gasification dry ash disposal system also
Including the crude synthesis gas feed pipe being connected with a gasification furnace, described crude synthesis gas feed pipe is used for connecting described gasification furnace
With the bottom of described fly-ash filter, thus crude synthesis gas are delivered in described fly-ash filter.
3. gasification dry ash disposal system as claimed in claim 2 is it is characterised in that described gasification furnace and described crude synthesis gas
It is additionally provided with a heat exchanger between feed pipe.
4. gasification dry ash disposal system as claimed in claim 1 it is characterised in that described flying dust collecting tank and described fly
One first level sensor and one second level sensor are respectively arranged with grey emptying tank.
5. gasification dry ash disposal system as claimed in claim 4 it is characterised in that described gasification dry ash disposal system also
It is provided with an ash disposal system control module, the control signal outfan of described first level sensor connects described ash disposal system and controls
The control signal input of module, the control signal input of described first blanking control valve connects described ash disposal system and controls mould
The control signal outfan of block；The control signal outfan of described second level sensor connects described ash disposal system control module
Control signal input, the control signal input of described second blanking control valve connects described ash disposal system control module
Control signal outfan.
6. gasification dry ash disposal system as claimed in claim 2 is it is characterised in that described gas buffer tank is also by one
One orifice flowmeter is connected with the bottom of described flying dust collecting tank；When gasification furnace pressure is 4.0mpa, collect to described flying dust
The pressure 5.20mpa of the gases at high pressure of the bottom input of tank；
Described gas buffer tank is connected with the bottom of described flying dust emptying tank by one second orifice flowmeter；When gasification furnace pressure
During for 4.0mpa, to the pressure 5.20mpa of the gases at high pressure of the bottom input of described flying dust emptying tank.
7. gasification dry ash disposal system as claimed in claim 1 it is characterised in that when gasification furnace pressure be 4.0mpa when,
The pressure 7.8mpa of high pressure blowback air.
8. gasification dry ash disposal system as claimed in claim 1 is it is characterised in that described decompressor is a venturi
Pipe.
9. a kind of process for deashing is it is characterised in that described process for deashing is using the coal gas as described in any one of claim 1～8
Change dry method ash disposal system to carry out, it comprises the steps:
S1: crude synthesis gas are delivered in described fly-ash filter, the synthesis gas after filtration from bottom to top enters described flying dust mistake
The top of filter, then through described syngas outlet pipe be delivered to described in wash unit；
S2: the dust carried secretly in crude synthesis gas falls into the flying dust of the bottom of described fly-ash filter in the presence of high pressure blowback air
In collecting tank；
S3: described flying dust emptying tank is carried out being pressurized to the pressure balance of described flying dust collecting tank using gases at high pressure；
S4: open described first blanking control valve after the material position of flying dust collecting tank reaches 50%～70%, make flying dust blanking extremely
In described flying dust emptying tank；
S5: when the material position of flying dust emptying tank reach to a certain degree 50%～70% after, close described first blanking control valve, then
Bottom to described flying dust emptying tank is passed through gases at high pressure, to the pressure of flying dust emptying tank be 0.5～4mpa when, open described the
Two blanking control valves, flying dust is delivered in described flying dust warehouse by described flying dust emptying tank；
S6: after the completion of conveying, close described first blanking control valve and described second blanking control valve；
S7: be passed through gases at high pressure in described flying dust emptying tank, make the air pressure in described flying dust emptying tank collect with described flying dust
Tank balances each other, and then opens described first blanking control valve, carries out ash operation next time.
10. process for deashing as claimed in claim 9 is it is characterised in that enter the temperature of the crude synthesis gas of described fly-ash filter
Spend for 340 DEG C, pressure be 4.0mpa；Described gases at high pressure are compressed air, nitrogen or carbon dioxide；Described high pressure blowback
Gas is synthesis gas.
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| CN112957864A (en) * | 2021-02-04 | 2021-06-15 | 华能（天津）煤气化发电有限公司 | Flying ash filtering system for preventing flying ash from entering torch after filter stick breakage |
| CN112973292A (en) * | 2021-02-05 | 2021-06-18 | 华能（天津）煤气化发电有限公司 | Flow arrangement for preventing IGCC torch from ash |
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| CN112957864B (en) * | 2021-02-04 | 2022-03-25 | 华能（天津）煤气化发电有限公司 | Flying ash filtering system for preventing flying ash from entering torch after filter stick breakage |
| CN112973292A (en) * | 2021-02-05 | 2021-06-18 | 华能（天津）煤气化发电有限公司 | Flow arrangement for preventing IGCC torch from ash |
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