CN208649244U - A kind of circulation fluidized bed coal gasifying system - Google Patents
A kind of circulation fluidized bed coal gasifying system Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 119
- 238000002309 gasification Methods 0.000 claims abstract description 142
- 239000000428 dust Substances 0.000 claims abstract description 140
- 239000007789 gas Substances 0.000 claims description 105
- 239000003795 chemical substances by application Substances 0.000 claims description 46
- 239000002918 waste heat Substances 0.000 claims description 45
- 239000002956 ash Substances 0.000 claims description 32
- 239000007787 solid Substances 0.000 claims description 29
- 239000002245 particle Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000010881 fly ash Substances 0.000 claims description 11
- 238000010079 rubber tapping Methods 0.000 claims description 8
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- 238000000034 method Methods 0.000 abstract description 17
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 238000004064 recycling Methods 0.000 description 13
- 238000000926 separation method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
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- 238000009826 distribution Methods 0.000 description 6
- 239000008187 granular material Substances 0.000 description 6
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
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- 239000000047 product Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
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- 239000002802 bituminous coal Substances 0.000 description 2
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- 239000003500 flue dust Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
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- 239000011574 phosphorus Substances 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 239000008234 soft water Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
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- 238000005303 weighing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a kind of circulation fluidized bed coal gasifying systems, belong to Coal Clean efficient technique of rainwater utilization field, a kind of circulation fluidized bed coal gasifying system, including gasification furnace, cyclone separator and heat-exchange system, the raw gas outlet of cyclone separator is connected with flying dust forced circulation by heat-exchange system and utilizes module.This system increases flying dust forced circulation using module, reduces flying dust discharge rate, substantially increases charcoal percent conversion；Flying dust forced circulation using module include circulation flying dust quantify setter, the flying dust amount except flying dust internal circulating load and output system can be controlled to adjust, it can be achieved that gasification system circulating ratio it is controllable.Using above-mentioned gasification system, makes full use of the thermal energy in flying dust removal process and realize the second gasification of flying dust, and then realize the controllable of gasification furnace circulating ratio, improve the carbon conversion ratio of coal.
Description
Technical field
The utility model belongs to Coal Clean efficient technique of rainwater utilization field, specifically, being related to a kind of recirculating fluidized bed coal
Gasification system.
Background technique
Coal Gasification Technology is one of coal high-efficiency, the core technology of clean utilization, refers specifically to gasifying coal and gasifying agent
It is reacted in furnace and raw gas is made, then raw gas dust-removal and desulfurizing is purified to obtain the process of clean coal gas.Drawn by top of gasification furnace
Air-flow out mainly includes admixture of gas product and the solid particle containing coal and ash, after cyclone separator,
In 90% or more powder collection get off through refeed line returning charge to burner hearth, then formed in material and followed in fluidized-bed gasification furnace
Ring.Circulated material quantity is circulating ratio than coal feeding amount in gasification system.Its circulation of existing circulation fluidized bed coal gasifying technology
Multiplying power can not regulate and control, and the refeed line for being all made of not material returning device carries out Natural Circulation；Though its refeed line have material returning device,
It generally requires to be passed through excessive air, steam or nitrogen, although this mode realizes the controllable adjustment of circulating ratio, still
It introduces excessive gasifying agent or inert gas and leads to the reduction of calorific value of gas.And about 10% is usually contained in flying dust
To 60% unreacted carbon, the recycling of flying dust is technical problem typical in fluidized-bed reactor.
Chinese Patent Application No. 201410117504.1, open notification number CN103911179A, day for announcing 2016-04-27
Patent document disclose coal gasification method and device.The coal gasification method includes: that raw coal and gasifying agent feeding is ciculation fluidized
Bed gasification furnace is reacted；The gasification kiln gas for generating reaction through the first gas-solid separator isolates returning charge raw coal and with raw coal
Air-flow, and returning charge raw coal is recycled back to circle fluidized-bed gasification furnace the reaction was continued, the second gas-solid separator will be flowed through with rough gas
Isolate coal gas and carbon containing flying dust；Carbon containing flying dust is sent into hot-blast stove, so that it is being higher than 1300 DEG C of burnings, by the hot-blast stove of generation
Flue gas returns and participates in reaction in circle fluidized-bed gasification furnace, and the liquid slag generated of burning is discharged after cooling；The invention provides
Coal gasification method and device overcome and existing carry out in the product of coal gasification that flying dust amount is big, phosphorus content is high using recirculating fluidized bed
The problem of, and the phosphorus content of slag is greatly reduced, to achieve the purpose that coal efficiently uses.But the invention there are it is following not
Foot: the separated carbon containing flying dust of the second gas-solid separator is sent into hot-blast stove, makes it at higher than 1300 DEG C burnings, this flying dust
Its hot-blast stove of reason mode increases equipment investment cost, and also needing to be passed through excessive oxygen improves its reaction temperature, makes flying dust
Heat can be promoted and meet burning condition so that thermal energy is underutilized, operating cost is improved；And it is by second point
The carbon containing flying dust separated from device is all recycled in gasification furnace, and gasification system circulating ratio (circulation can not be realized according to the working of a furnace
Inventory is than coal feeding amount) it is controllable.
Chinese patent publication No. CN103184077A, the patent document of date of publication 2013-07-03 disclose a kind of with winged
Ash forces the method for pulverized coal gasification of re-injection system, and the coal gas that coal gasification reaction generates carries fly ash granule secretly, carries fly ash granule secretly
Coal gas separate coal gas with fly ash granule by cyclone separator, the fly ash granule after separation enters gas distribution in gasification furnace
The lower section of plate, is burnt and gasification reaction again.This method is by being mounted on pulverized coal fluidized bed coke powder for gas ejector
Between the vertical feeder pipe of the circulatory system and gasification furnace, the fly ash granule of recycling is passed through under gas distribution grid by gas ejector
Side, is directly entered the high-temperature oxydation area in gasification furnace centre, burning and gasification reaction occurs again, to improve the carbon of fine coal
Conversion ratio is attained by 98% or more for lignite and bituminous coal.Even for the colm of " three high and one low ", i.e., high-sulfur, high ash,
The coal of high ash melting temperature and low reaction activity, one way efficiency of carbon con version also can achieve 92% or more.But the invention is still deposited
In following deficiency: 1) invention is using cyclone separator by collected particle re-injection to burner hearth, and cyclone separator separating effect is only
90% particle can be collected, smaller particle can not separate, therefore even if using gas ejector by the fly ash granule loopback of recycling
To gasification furnace, coal gas still can take away most of carbon particle, and efficiency of carbon con version is not high and cannot quantitatively control the circulation times of gasification furnace
Rate；2) invention does not make full use of the heat of flying dust.
Summary of the invention
1, it to solve the problems, such as
What for flying dust removal process heat utilization rate in existing circulating fluidized bed system, low, circulating ratio can not regulate and control asks
Topic, the utility model provide a kind of circulation fluidized bed coal gasifying system.It can make full use of the thermal energy in flying dust removal process
And realize the second gasification of flying dust, and then realize the controllable of gasification furnace circulating ratio, improve the carbon conversion ratio of coal.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of circulation fluidized bed coal gasifying system, including gasification furnace, cyclone separator and heat-exchange system, the gasification furnace
Gas exit is connected with the cyclone separator, the solid coal particle outlet of the cyclone separator and returning for the gasification furnace
Material mouth is connected, and the raw gas outlet of the cyclone separator is connected with flying dust forced circulation by the heat-exchange system and utilizes mould
Block, the flying dust forced circulation include flying dust quantitative conveyer using module, the flying dust quantitative conveyer and
The gasification furnace is connected, so that flying dust is quantitatively recycled to gasification furnace.
Preferably, the heat-exchange system includes preheater and waste-heat recoverer, the cyclone separator, described pre-
Hot device and the waste-heat recoverer are sequentially connected, and the waste-heat recoverer output end utilizes module phase with flying dust forced circulation
Even；
The heat-exchange system further includes drum, and the drum first input end is connected with water supply equipment, the vapour
First output end of packet is connected with the water inlet of the waste-heat recoverer, and the steam outlet of the waste-heat recoverer passes through described
Drum is connected with the preheater.
Preferably, the flying dust forced circulation further includes having bag filter and intermediate ash bucket using module, described
The input terminal of bag filter is connected with the waste-heat recoverer output end with the intermediate ash bucket respectively with output end；
The flying dust quantitative conveyer includes that circulation flying dust quantifies setter and Pneumatic conveyer, the centre
The circulation flying dust of ash bucket passes sequentially through circulation flying dust and quantifies setter and Pneumatic conveyer is recycled to gasification furnace, the centre
Ash bucket side is also connected with flying dust recruiting unit.
It preferably, further include having gasifying agent supply equipment, the gasifying agent supply equipment passes through preheater and described
Gasification furnace is connected.
Preferably, the bag filter gas exit is connected by gas cooler with desulphurization plant.
Preferably, the gasification furnace is also connected with coal-feeding device and slag-tapping device.
Preferably, the inner wall of the gasification furnace is equipped with refractory material layer or water-cooling wall.
3, beneficial effect
Compared with the prior art, the utility model has the following beneficial effects:
(1) a kind of circulation fluidized bed coal gasifying system of the utility model increases flying dust forced circulation and utilizes module, will
The separated part cinder reinjection out of bag filter is to gasification furnace burner hearth, so that carbon containing flying dust is contacted again gasifying agent progress
Repeatedly reaction, reduces flying dust discharge rate in circulation fluidized bed coal gasifying system, and substantially increase charcoal percent conversion；And fly
Grey forced circulation includes flying dust quantitative conveyer using module, can be to the flying dust except flying dust internal circulating load and output system
Amount controlled to adjust, it can be achieved that fluidized gasification system circulating ratio it is controllable；Flying dust forced circulation is used using module
Pneumatic conveyer conveys flying dust, does not need to introduce excessive gas medium or inert gas, to coal gas production capacity with
And calorific value influence is small；
(2) a kind of circulation fluidized bed coal gasifying system of the utility model, heat-exchange system include preheater, waste heat recycling
Device and drum exchange heat the raw gas containing flying dust of heat and gasifying agent in preheater, while by the architectural characteristic of drum,
Raw gas and water is allowed sufficiently to exchange heat in waste-heat recoverer, generation this gasifying agent of vapor further passes through drum and enters preheating
Device and raw gas enter gasification furnace after further exchanging heat and participate in reaction, the high temperature gasification agent generated in this way and room temperature gasifying agent phase
Than high temperature gasification agent makes the heat of reaction of raw coal and gasifying agent consumption decline 20%, and the combustible component in the coal gas generated
Improve 20%~30%；
(3) a kind of circulation fluidized bed coal gasifying system of the utility model, wherein flying dust quantitative conveyer includes circulation
Flying dust quantifies setter and Pneumatic conveyer, and circulation flying dust quantifies the optional mass flowmenter of setter or feed bin claims
Sensor is retransmitted, is controlled to adjust to sending to recycling carbon containing flying dust amount in gasification furnace；Pneumatic conveyer is using pneumatic conveying
For form by cinder reinjection to burner hearth, continous way storehouse pump, injection type coal gas-solid-ejector or coal dust pump is can be used in Pneumatic conveyer,
The method of this pneumatic conveying greatly reduces conveying gas flow, influences on calorific value of gas small；
(4) a kind of circulation fluidized bed coal gasifying system of the utility model, when flying dust is recycled and is recycled, the outer dispatch of a part
To downstream secondary flying ash recruiting unit, a part recycling is recycled to burner hearth bottom by flying dust quantitative conveyer, avoids complete
Portion is recycled to gasification furnace, can not be arranged in the form of slag under the interior fluidized state of gasification furnace since particle size of fly ash is extremely tiny
Out, with the intensification of the carbon extent of reaction in flying dust, the problem of easily causing the endless loop in gasification furnace；
(5) a kind of circulation fluidized bed coal gasifying system of the utility model, bag filter gas exit are cold by coal gas
But device is connected with desulphurization plant, and coal gas is further purified；
(6) a kind of circulation fluidized bed coal gasifying system of the utility model, the inner wall of gasification furnace be equipped with refractory material layer or
Water-cooling wall is used for byproduct steam；
(7) a kind of circulation fluidized bed coal gasifying system of the utility model carries out coal gasification reaction, can make full use of winged
The second gasification of thermal energy and realization flying dust in grey removal process, and then realize the controllable of gasification furnace circulating ratio, improve coal
The carbon conversion ratio of charcoal.
Detailed description of the invention
Fig. 1 is the system construction drawing of the utility model.
In figure: 1, screw-type coal distributor；2, gasification furnace；3, cyclone separator；4, preheater；5, waste-heat recoverer；6, drum；
7, bag filter；8, gas cooler；9, intermediate ash bucket；10, slag notch；11, refeed line；12, circulation flying dust quantitatively gives
Device；13, Pneumatic conveyer；14, coal feeding hole；15, return port；16, First air entrance；17, Secondary Air entrance；18, solid
Coal particle outlet；19, the first preheater air/oxygen entrance；20, the first preheater air/oxygen entrance；21, preheater steams
Vapour entrance；22, preheater gasification agent outlets；23, waste-heat recoverer gas entry；24, waste-heat recoverer gas exit.
Specific embodiment
The utility model is further described below in the following with reference to the drawings and specific embodiments.
Embodiment 1
As shown in Figure 1, a kind of circulation fluidized bed coal gasifying system, including gasification furnace 2, cyclone separator 3 and heat-exchange system,
2 gas exit of gasification furnace is connected with cyclone separator 3, the solid coal particle outlet 18 of cyclone separator 3 and the returning charge of gasification furnace 2
Mouth 15 is connected, and the raw gas outlet of cyclone separator 3 is connected with flying dust forced circulation using module by heat-exchange system, and flying dust is strong
It includes flying dust quantitative conveyer that system, which recycles module, and flying dust quantitative conveyer is connected with gasification furnace 2, so that flying dust is fixed
Amount is recycled to gasification furnace 2.
The gasification system of the utility model is provided with flying dust forced circulation using module, by cinder reinjection to gasification furnace 2,
It is repeatedly reacted so that carbon containing flying dust is contacted again gasifying agent, to improve charcoal percent conversion, reduces the residual of flying dust
Carbon rate；And flying dust forced circulation includes flying dust quantitative conveyer using module, so that flying dust is quantitatively recycled to gasification furnace
2, can the circulating ratio to gasification furnace 2 carry out quantitative control, the unburned carbon in flue dust being output to except system can also be adjusted
Section and control.
It is noted that flying dust forced circulation using in module by continous way storehouse pump, injection type coal gas-solid-ejector or
The Pneumatic conveyer 13 of person's coal dust pump subtracts cinder reinjection to 2 burner hearth of gasification furnace using the method for this pneumatic conveying significantly
Conveying gas flow is lacked, calorific value of gas has been influenced small.
A kind of circulation fluidized bed coal gasifying system of the present embodiment, gasification process are specific as follows: raw coal be dried,
Partial size is delivered to gasification furnace 2 after being crushed to 10mm or less, through transportation system belt conveyor, with air or oxygen or water
Steam gasifies, the coal gas with solid coal particle of generation of gasifying from 2 gas exit of gasification furnace enter cyclone separator 3 into
Row gas solid separation, wherein the gas main component for generation of gasifying is CO, H2、CO2、H2S、CH4、N2、H2O, solid particle, which refers to, to be contained
There is the solid particle of coal, ash, the solid coal particle obtained through 3 gas solid separation of cyclone separator is through 11 returning charge of refeed line to gasification furnace
2 continue to participate in reaction；
The raw gas that 3 gas solid separation of cyclone separator obtains exchanges heat by heat-exchange system and gasifying agent, generates high temperature
Gasifying agent makes full use of the thermal energy in raw gas；
Raw gas after cooling is quantitatively conveyed using module flying dust obtained after separation by flying dust through flying dust forced circulation
Device is recycled to gasification furnace 2 and gasifies again, is repeatedly reacted so that carbon containing flying dust is contacted again gasifying agent, to improve
Charcoal percent conversion reduces the Residual carbon of flying dust；And by flying dust quantitative conveyer, so that flying dust is quantitatively recycled to gas
Change in furnace 2, can the circulating ratio to gasification furnace 2 carry out quantitative control, can also be to the unburned carbon in flue dust being output to except system
It is adjusted and controls.
Embodiment 2
A kind of circulation fluidized bed coal gasifying system of the present embodiment, structure is substantially the same manner as Example 1, further
, the heat-exchange system of the present embodiment includes preheater 4 and waste-heat recoverer 5, cyclone separator 3, preheater 4 and waste-heat recoverer
5 are sequentially connected, and 5 output end of waste-heat recoverer, i.e. waste-heat recoverer gas exit 24 are connected with flying dust forced circulation using module.
The heat-exchange system of the present embodiment takes full advantage of the heat of raw gas, in preheater 4, sufficiently changes with gasifying agent
Heat saves gasifying agent and enters gasification furnace 2 and continues to heat required energy.
Heat-exchange system further includes drum 6,6 first input end of drum, i.e. the soft water entrance of drum 6 is connected with water supply and sets
Standby, the first output end of drum 6, the i.e. soft water outlet of drum 6 are connected with the water inlet of waste-heat recoverer 5, waste-heat recoverer 5
Steam outlet is by 6 second input terminal of drum, i.e. after the steam inlet of drum 6 enters the buffering of drum 6, from the second of drum 6
The steam (vapor) outlet of output end, that is, drum 6 is connected with preheater 4, and the raw gas come out from preheater 4 still has very high heat,
Allow raw gas and water sufficiently to exchange heat in waste-heat recoverer 5, generate this gasifying agent of vapor by drum 6 architectural characteristic, into
One step enters gasification furnace 2 after further exchanging heat by drum 6 into preheater 4 and raw gas and participates in reaction, utilizes in flying dust
The thermal energy of raw gas is taken full advantage of in the process.
The raw gas temperature for the entrainment flying dust separated from cyclone separator 3 is 900 DEG C or so, preheated device 4 and gas
Agent air or oxygen and from waste-heat recoverer 5 exchange heat produced temperature be 140 DEG C or so vapor exchange heat, slightly
The temperature that coal gas comes out from 4 lower exit port of preheater is 450 DEG C~500 DEG C or so, and preheated gasification agent outlets temperature is 750
DEG C or so enter 2 burner hearth of gasification furnace；Compared with room temperature gasifying agent, high temperature gasification agent makes the heat of reaction of raw coal and gasifying agent disappear
Consumption decline 20%, and the combustible component in the coal gas generated improves 20%~30%.
It is cooled to 450 DEG C~500 DEG C of raw gas and water carries out heat exchange in waste-heat recoverer 5 and generates steam, from waste heat
The raw gas temperature that 5 output end of recover comes out is 150 DEG C~200 DEG C, and steam a part is used as gas as byproduct, a part
Agent enters preheater 4 and further preheats.
Embodiment 3
A kind of circulation fluidized bed coal gasifying system of the present embodiment, including gasification furnace 2, cyclone separator 3 and heat-exchange system,
Heat-exchange system includes preheater 4, waste-heat recoverer 5 and drum 6, and heat-exchange system is connected with flying dust forced circulation using module, flies
Grey forced circulation includes flying dust quantitative conveyer, bag filter 7 and intermediate ash bucket 9 using module, bag filter 7
Input terminal is connected with 5 output end of waste-heat recoverer with intermediate ash bucket 9 respectively with output end, comes out from 5 output end of waste-heat recoverer
The raw gas of entrainment flying dust enter bag filter 7, bag filter 7 can capture tiny flying dust, collected by get off fly
Ash enters intermediate ash bucket 9；Flying dust quantitative conveyer includes that circulation flying dust quantifies setter 12 and Pneumatic conveyer 13, in
Between the circulation flying dust of ash bucket 9 pass sequentially through circulation flying dust and quantify setter 12 and Pneumatic conveyer 13 is recycled to gasification furnace 2,
Intermediate 9 side of ash bucket is also connected with flying dust recruiting unit, therefore the outer dispatch of flying dust a part in intermediate ash bucket 9 flies to downstream is secondary
Grey recruiting unit, a part recycling are recycled to burner hearth bottom by flying dust quantitative conveyer, avoid all being recycled to gasification furnace
2, it can not be discharged in the form of slag under the interior fluidized state of gasification furnace 2 since particle size of fly ash is extremely tiny, in flying dust
The intensification of the carbon extent of reaction easily causes the endless loop in gasification furnace 2.
It should be noted that quantitatively calculating required material according to the circulating ratio of gasification furnace 2, pass through in intermediate ash bucket 9
Flying dust quantitative conveyer is recycled to the part flying dust of gasification furnace 2 as circulation flying dust, and the flying dust remained in intermediate ash bucket 9 is sent
To downstream secondary flying ash recruiting unit, referred to as recycling flying dust, circulation flying dust quantifies setter 12 and may be selected to be mass flowmenter
Or feed bin weighing sensor, to realize the control and regulation to flying dust internal circulating load, and then control the circulating ratio of gasification furnace 2.
The gasification system of the present embodiment further includes having gasifying agent supply equipment, and gasifying agent supply equipment passes through preheater 4
It is connected with gasification furnace 2, provides gasifying agent for gasification furnace 2, include oxygen or air, oxygen or air and vapor passes through pre-
The raw gas of hot 4 heat of neutralization of device exchanges heat to obtain high temperature gasification agent to be come out from preheater gasification agent outlets 22, then from the two of gasification furnace 2
A position enters: one is located at 2 bottom of gasification furnace, referred to as First air, and ratio is 60%~70%；Second position is located to coal
14 top of mouth, the high temperature gasification agent of feeding are known as Secondary Air, and proportion is 30%~40%, the design of secondary air, so that
The complete coal of unreacted and gasifying agent haptoreaction again, improve charcoal percent conversion.
Gasification furnace 2 is boundary with Secondary Air entrance 17, is divided into emulsion zone and dilute-phase zone, and emulsion zone is also known as boiling section, gas velocity
Degree is very fast, and dilute-phase zone is also known as suspension section, and 2 sectional area of gasification furnace increases so that under dilute-phase zone air velocity at Secondary Air entrance 17
Drop, coal dust fine grained are self-possessed and are settled, and form circulation in furnace, increase residence time of the coal dust in furnace.
Cinder reinjection is located at the lower part emulsion zone of gasification furnace 2 to the position of gasification furnace 2, while introducing Secondary Air, improves
The reaction temperature of dilute-phase zone, increasing with fine grained includes the residence time of the mixing and flying dust of flying dust in furnace, is effectively returned
The energy in flying dust is received.
A kind of circulation fluidized bed coal gasifying system of the present embodiment, when work specifically includes the following steps:
Step 1: gasification reaction, by raw coal it is broken after send to gasification furnace 2, air that gasifying agent supply equipment provides or
Oxygen enters gasification furnace 2 after the preheating of preheater 4 and gasification reaction, the gasification reaction temperature control of gasification furnace 2 occur for raw coal
At 900 DEG C -1150 DEG C, under so high gasification temperature, the utilization rate of carbon and hydrogen in coal charge is not only increased, to improve
Effective gas ingredient in raw gas also significantly reduces the dust entrainment in coal gas；And volatile matter decomposes completely in coal under high temperature,
So that phenols and methane content are few in coal gas, and are free of tar, the clean and effective for realizing coal is utilized；Gasification furnace 2 can be used resistance to
Firebrick material is as lining, it is possible to use water-cooling wall lining is used for byproduct steam, according to actual needs can be with flexible choice；
Step 2: gas solid separation, the coal gas with solid coal particle obtained after gasification reaction in gasification furnace 2 is from gasification furnace
2 gas exits enter cyclone separator 3 and carry out gas solid separation, and the cyclone separator 3 of the present embodiment can be by >=10 μm of solid
Grain is totally separated out, and separative efficiency up to 90%, extremely gasify by the solid coal particle returning charge that 3 gas solid separation of cyclone separator obtains
2 return port 15 of furnace carries out gasification reaction again；The raw gas that 3 gas solid separation of cyclone separator obtains enters heat-exchange system；
Step 3: heat exchange, the higher raw gas of temperature in preheater 4 with air or oxygen from gasifying agent supply equipment
Gas exchanges heat；The raw gas exported from preheater 4 exchanges heat in waste-heat recoverer 5 with the water from drum 6, and waste heat returns
It receives 5 steam outlet of device to be connected by drum 6 with preheater 4, water vapour and raw gas is exchanged heat, vapor is further added
Heat；
Step 4: flying dust recycling, the raw gas flowed out from 5 output end of waste-heat recoverer enters bag filter 7, to coal gas
It is separated with flying dust, resulting coal gas, which is passed through next workshop section, to be continued to purify, and resulting flying dust flows into intermediate ash bucket 9, flying dust
Including circulation flying dust and recycling flying dust, recycling flying dust is collected into flying dust recruiting unit by storehouse pump, and circulation flying dust is successively by following
Ring flying dust quantifies setter 12 and Pneumatic conveyer 13 is recycled to gasification furnace 2 and gasifies again, and circulation flying dust is back to
The position of 3 refeed line 11 of cyclone separator, the neighbouring or individual spout of blast cap etc. may be selected in the position of gasification furnace 2.
Embodiment 4
A kind of circulation fluidized bed coal gasifying system of the present embodiment, structure is substantially the same manner as Example 3, in order to enable cold
But the rear coal gas of dedusting is further purified, and 7 gas exit of bag filter of the present embodiment is connected with de- by gas cooler 8
Sulphur equipment.
Embodiment 5
A kind of circulation fluidized bed coal gasifying system of the present embodiment, structure is substantially the same manner as Example 3, further
, gasification furnace 2 is also connected with coal-feeding device and slag-tapping device, and coal-feeding device includes screw-type coal distributor 1, and raw coal is through being crushed to 10mm
After below, be delivered to coal supply system run coal bin through transportation system belt conveyor, then by connect coal scuttle, screw-type coal distributor 1 and
Coal feeding pipe gate valve from the lower part of gasification furnace 2 be added, and the broken size controlling of raw coal in 10mm hereinafter, raw coal is allowed to exist
It is sufficiently contacted with gasifying agent in gasification furnace 2, reacts more thorough, improve the carbon utilisation rate of coal；Gasification furnace 2 reacts remaining solid
Body waste residue is discharged in time by slag-tapping device.
Embodiment 6
A kind of circulation fluidized bed coal gasifying system of the present embodiment, including gasification furnace 2 are provided with into furnace on gasification furnace 2
It is sent into the First air entrance 16 of high temperature gasification agent, Secondary Air entrance 17, coal feeding hole 14, is sent into the return port for recycling coal into furnace
15, gas exit, circulation flying dust entrance and slag notch 10；Gasification furnace 2 is made of air-distribution device and burner hearth, and air-distribution device is set
In 2 lower part of gasification furnace, it is made of blast cap, air duct, gas distributing chamber and air distribution plate.First air gasifying agent air or oxygen
And steam inlet duct is connected with air duct, gas exit is located at 2 top of gasification furnace, connects the import of cyclone separator 3, rotation
Wind separator 3 is equipped with cyclone separator gas inlet, solid coal particle outlet 18 and raw gas outlet, by entrainment coal and grey solid
The coal gas of particle isolates returning charge solid particle and entrainment flying dust coal gas.Wherein cyclone separator gas inlet and follow gasification furnace 2
Gas exit is connected, and solid coal particle outlet 18 is connected by refeed line 11 with the return port 15 of gasification furnace 2, and raw gas goes out
Mouth is then connected with preheater 4.
Preheater 4 is equipped with preheater gas entry, preheater gas exit, the first preheater air/oxygen entrance 19, the
Two preheater air/oxygen entrances 20, preheater steam inlet 21, preheater gasification agent outlets 22, from 3 rough coal of cyclone separator
950 DEG C or so of the raw gas that gas exports out exchanges heat in preheater 4 with gasifying agent, and preheater 4 is changed using shell and tube
Hot device, coal gas walk tube side, and gasifying agent walks shell side.Wherein preheater gas exit is connected with waste-heat recoverer gas entry 23,
Preheater steam inlet 21 is connected with 6 second output terminal of drum, and preheater gasification agent outlets 22 are connected with First air entrance 16.
Waste-heat recoverer 5 is equipped with waste-heat recoverer gas entry 23, waste-heat recoverer gas exit 24, waste-heat recoverer and enters
The mouth of a river, waste-heat recoverer steam outlet exchange heat coal gas and water in waste-heat recoverer 5, and waste-heat recoverer 5 is using column
Pipe heat exchanger, coal gas walk tube side, and water walks shell side；Coal gas further cools down recovery waste heat byproduct steam simultaneously, institute's producing steam one
Part is used as byproduct, and a part enters preheater 4 as gasifying agent and further preheats, wherein waste-heat recoverer gas exit 24
It is connected with bag filter 7.
Bag filter 7 is equipped with bag filter gas entry, i.e. 7 input terminal of bag filter, the carbon containing flying dust of circulation goes out
Mouthful, i.e. entrainment flying dust coal gas is separated into coal gas and carbon containing flown by 7 output end of bag filter and bag filter gas exit
Ash.Wherein bag filter gas exit is connected with gas cooler 8, recycles carbon containing flying dust outlet and is connected with intermediate ash bucket 9
It connects, the outer dispatch of collected flying dust a part to downstream secondary flying ash recruiting unit, a part and flying dust and flying dust forced circulation benefit
Setter 12 is quantified with the circulation flying dust of module to be connected.Gas cooler 8 exchanges heat coal gas and recirculated water, and water walks pipe
Journey, coal gas walk shell side, and coal gas is cooled to room temperature and is sent to the conveying of desulphurization system rear line.
Flying dust forced circulation includes that circulation flying dust quantifies setter 12 and Pneumatic conveyer 13 using module；Circulation
Flying dust quantifies setter 12, controls to adjust to sending to recycling carbon containing flying dust amount in gasification furnace 2, mass flowmenter may be selected
Or feed bin weighing sensor；Pneumatic conveyer 13 uses the form of pneumatic conveying by cinder reinjection to burner hearth, pneumatic transporting
Send device that continous way storehouse pump, injection type coal gas-solid-ejector or coal dust pump can be used；In addition, circulation fly ash carry pipeline can be with gas
The return port 15 of change furnace 2, First air entrance 16 are connected, or individually circulation flying dust is arranged above emulsion zone air-distribution device
Entrance is coupled, and 2 slag notch 10 of gasification furnace is connected with slag-tapping device；Slag-tapping device includes spiral tapping machine and defeated slag crust
Band.
Working principle: 2 lower part of gasification furnace is entered by screw-type coal distributor 1 for 10mm raw coal below through dry and broken partial size
Emulsion zone, superheated steam, air or the oxygen-enriched air that preheated device 4 and waste-heat recoverer 5 preheat enter from First air respectively
Mouth 16 and Secondary Air entrance 17 enter 2 bottom of gasification furnace, and raw coal reacts rapidly at 950 DEG C with gasifying agent, and in ascending air
Under the action of enter the dilute-phase zone of gasification furnace 2 to the ionized motion of gasification furnace 2, since dilute-phase zone sectional area increases so that gas velocity
Degree reduces, and biggish coal particle flows downward along furnace wall through 10 row of lower tapping hole after entering top dilute-phase zone due to being self-possessed
Out.It reacts the admixture of gas product generated and the solid particle containing coal and ash leaves burner hearth from 2 top of gasification furnace and enters
Cyclone separator 3, after cyclone separator 3, wherein most solid particle is collected through 11 returning charge of refeed line extremely
Burner hearth then forms the interior circulation of material in gasification furnace 2；The carbon containing flying dust not being separated passes through preheater 4 with raw gas
With waste-heat recoverer 5 enter after heat exchange is cooling bag filter 7 be separated it is outer through intermediate ash bucket 9 and storehouse pump a part
Dispatch to secondary flying ash receives downstream unit, and a part cycles through flying dust quantitative conveyer and is recycled to burner hearth the reaction was continued；
Coal gas after dedusting enter gas cooler 8 be cooled further to be sent into desulphurization plant after room temperature after be delivered to user.
The advantage of specific experiment data analytic explanation the utility model embodiment will be passed through below.
Using bituminous coal as experimental analysis raw material, coal analysis is carried out to it first, is shown in Table 1.
Table 1
| Mt/ % | Ad/ % | Vd/ % | FCd/ % | Cd/ % | Hd/ % | Od/ % | Nd/ % | Sd/ % | Qdaf,ar/kcal·kg-1 |
| 12.00 | 11.99 | 33.53 | 54.48 | 70.11 | 5.09 | 11.35 | 0.95 | 0.51 | 5114.5 |
Note: M in tabletTotal moisture content/% of-coal；AdDry basis ash content content/% of-coal；VdThe butt of-coal volatilizees
Divide content/%；FCdFixed carbon content/the % of the butt of-coal；HdButt hydrogen content/% of-coal；OdThe butt oxygen of-coal contains
Amount/%；NdButt nitrogen content/% of-coal；SdButt sulfur content/% of-coal；Qdaf,arThe As-received calorific value of-coal/
kcal·kg-1。
Such as the Gas Production carried out under the conditions of embodiment 6, coal feeding amount blasts air capacity and quantity of steam is shown in Table 2.
Table 2
| Coal feeding amount t/h | Blow rate required Nm3/h | It is passed through quantity of steam t/h |
| 11.6 | 23000 | 5.8 |
Its influence to road conditions and produced coal gas of quantity research is recycled by adjusting flying dust, is shown in Table 3.
Table 3
Note: cold gas efficiency is the chemical energy and the ratio between chemical energy of coal for gasification that gasification generates coal gas in table, coal gas and
The chemical energy of coal is all made of corresponding low heat valve；Efficiency of carbon con version is that the carbon that unit quality coal generates in coal gas accounts for unit mass
The percentage of carbon content in coal.
It can be seen that from this test result and flying dust recycled by flying dust quantitative conveyer loopback, gasify with being back to
Flying dust amount increases in 2 burner hearth of furnace, and circulating ratio increases, and reaction temperature gradually decreases, and bed drain purge increases, and gasify generated dry coal
Tolerance increases, and available gas ingredient (CO+H in dry gas ingredient2) content increases, calorific value of gas, cold gas efficiency and
Carbon conversion ratio increases, and flying dust Residual carbon gradually decreases.
Schematically the utility model and embodiments thereof are described above, description is not limiting, attached drawing
Shown in be also one of the embodiments of the present invention, actual structure is not limited to this.So if this field
Those of ordinary skill enlightened by it, without deviating from the purpose of the present invention, not inventively design
Frame mode similar with the technical solution and embodiment, all should belong to the protection range of the utility model.
Claims (7)
1. a kind of circulation fluidized bed coal gasifying system, including gasification furnace (2), cyclone separator (3) and heat-exchange system, the gas
Change furnace (2) gas exit to be connected with the cyclone separator (3), it is characterised in that: the solid coal of the cyclone separator (3)
Particle outlet (18) is connected with the return port (15) of the gasification furnace (2), and the raw gas outlet of the cyclone separator (3) passes through
The heat-exchange system is connected with flying dust forced circulation using module, and the flying dust forced circulation includes flying dust using module
Quantitative conveyer, the flying dust quantitative conveyer are connected with the gasification furnace (2).
2. a kind of circulation fluidized bed coal gasifying system according to claim 1, it is characterised in that: the heat-exchange system packet
Preheater (4) and waste-heat recoverer (5) are included, the cyclone separator (3), the preheater (4) and the waste heat return
It receives device (5) to be sequentially connected, the waste-heat recoverer (5) output end is connected with flying dust forced circulation using module；
The heat-exchange system further includes drum (6), and the drum (6) first input end is connected with water supply equipment, described
First output end of drum (6) is connected with the water inlet of the waste-heat recoverer (5), the water vapour of the waste-heat recoverer (5)
Outlet is connected by the drum (6) with the preheater (4).
3. a kind of circulation fluidized bed coal gasifying system according to claim 2, it is characterised in that: the flying dust pressure follows
Ring further includes having bag filter (7) and intermediate ash bucket (9) using module, the input terminal of the bag filter (7) and defeated
Outlet is connected with waste-heat recoverer (5) output end with the intermediate ash bucket (9) respectively；
The flying dust quantitative conveyer includes that circulation flying dust quantifies setter (12) and circulation fly ash carry device (13),
The circulation flying dust of the intermediate ash bucket (9) passes sequentially through circulation flying dust and quantifies setter (12) and Pneumatic conveyer (13) time
It send to gasification furnace (2), intermediate ash bucket (9) side is also connected with flying dust recruiting unit.
4. a kind of circulation fluidized bed coal gasifying system according to claim 2 or 3, it is characterised in that: further include having gasification
Agent supply equipment, the gasifying agent supply equipment are connected by preheater (4) with the gasification furnace (2).
5. a kind of circulation fluidized bed coal gasifying system according to claim 3, it is characterised in that: the bag filter
(7) gas exit is connected by gas cooler (8) with desulphurization plant.
6. a kind of circulation fluidized bed coal gasifying system according to claim 1, it is characterised in that: the gasification furnace (2)
It is also connected with coal-feeding device and slag-tapping device.
7. a kind of circulation fluidized bed coal gasifying system according to claim 1 or 6, it is characterised in that: the gasification furnace
(2) inner wall is equipped with refractory material layer or water-cooling wall.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108753368A (en) * | 2018-07-31 | 2018-11-06 | 安徽科达洁能股份有限公司 | A kind of circulation fluidized bed coal gasifying system and method |
| CN114686268A (en) * | 2020-12-27 | 2022-07-01 | 新疆宜化化工有限公司 | A process for using oxygen-enriched circulating fluidized bed to realize coal gasification of raw materials with different characteristics of coal to syngas |
| EP4130204A4 (en) * | 2020-03-24 | 2024-08-28 | Sekisui Chemical Co., Ltd. | PYROLYSIS GAS PURIFICATION/COOLING DEVICE, PYROLYSIS GAS PURIFICATION/COOLING METHOD, ORGANIC SUBSTANCE PRODUCTION DEVICE, AND ORGANIC SUBSTANCE PRODUCTION METHOD |
-
2018
- 2018-07-31 CN CN201821218760.XU patent/CN208649244U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108753368A (en) * | 2018-07-31 | 2018-11-06 | 安徽科达洁能股份有限公司 | A kind of circulation fluidized bed coal gasifying system and method |
| CN108753368B (en) * | 2018-07-31 | 2024-03-05 | 安徽科达洁能股份有限公司 | Circulating fluidized bed coal gasification system and method |
| EP4130204A4 (en) * | 2020-03-24 | 2024-08-28 | Sekisui Chemical Co., Ltd. | PYROLYSIS GAS PURIFICATION/COOLING DEVICE, PYROLYSIS GAS PURIFICATION/COOLING METHOD, ORGANIC SUBSTANCE PRODUCTION DEVICE, AND ORGANIC SUBSTANCE PRODUCTION METHOD |
| CN114686268A (en) * | 2020-12-27 | 2022-07-01 | 新疆宜化化工有限公司 | A process for using oxygen-enriched circulating fluidized bed to realize coal gasification of raw materials with different characteristics of coal to syngas |
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