CN104650990B - Pressurized circulating fluidized bed slag-draining device - Google Patents
Pressurized circulating fluidized bed slag-draining device Download PDFInfo
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- CN104650990B CN104650990B CN201510114540.7A CN201510114540A CN104650990B CN 104650990 B CN104650990 B CN 104650990B CN 201510114540 A CN201510114540 A CN 201510114540A CN 104650990 B CN104650990 B CN 104650990B
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- slag
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/52—Ash-removing devices
- C10J3/526—Ash-removing devices for entrained flow gasifiers
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses pressurized circulating fluidized bed slag-draining device, be characterized in HTHP lime-ash first lower the temperature be depressured afterwards after discharge.Gasification furnace bottom connection slag collecting chamber and slag blowdown vessel, using cooling water and the distinctive geomantic omen of synthesis gas Quench mode cooling down high-temperature high pressure lime-ash cold altogether in slag collecting chamber.The Quench gas for carrying lime-ash secretly exports wireway into cyclone separator isolation of purified Posterior circle utilization through slag collecting chamber, and the lime-ash with pressure after cooling falls into slag blowdown vessel, discharge is pulled out through dragveyer after slag bath is entered after being decompressed to normal pressure.The pressurization dry cinder discharging device of present invention design eliminates screw cinder cooling apparatus, efficiently solve under the conditions of pressurized gasification the easy seal leakage of lag cooler and it is stuck the problems such as, so that dreg removing system can steadily in the long term run under the conditions of pressurized gasification, maintenance cost is saved, improve production efficiency.
Description
Technical field
The present invention relates to a kind of pressurized circulating fluidized bed slag-draining device.
Background technology
Due to feedstock circulation multiplying power higher, heat transfer, mass transfer rate higher are widely used to coal gas to recirculating fluidized bed
Change and field of boilers, be particularly suitable for the utilization of China's colm.Current fluidized bed plant is mature on the whole in Large Atmosphere Pressure gasification,
But there is production low intensity in atmospheric unit, abilityscale is small, and counter investment is high, the unfavorable factor, pressurized bulk such as compression power consumption is high
Gasification technology is the developing direction of Coal Chemical Industry, and pressurized bulk Circulating Fluidized Bed Process and immature, one of technical problem be
Gasification deslagging aspect.
The normal pressure fluidized bed traditional at present uses the screw cinder cooling apparatus deslagging with cooling water as medium, will in actual production
Applied in the deslagging technique of pressure circulating fluid bed fine coal gasifying stove in the deslagging mode of this screw cinder cooling apparatus, operation conditions
It is very poor, it is embodied in：The slag of gasification furnace discharge is influenceed by running device conveying, cooling capacity, safe and stable operation shape
Condition is poor；The factors such as temperature is high of sealing poor performance and discharge slag under running device high temperature, pressurization operating mode are total to
With influence, so as to cause whole system to be unable to long period even running, it is impossible to meet pressure circulating fluid bed fine coal gasifying stove row
The requirement of slag technique.Therefore the row under the safety in operation and sealing reliability and solution pressurized state of slag cooler how is improved
Slag problem is the direction that technical staff needs research.
CN201074833Y discloses a kind of Autoimmunization sealing clinker-removing device, it is desirable to by lag cooler spiral propeller
One end install reductor, lower ash output cinder notch is located in sealed cistern, and the mode being connected with spiral propeller improves cold slag
The sealing property of machine.CN203893204U discloses a kind of lag cooler dreg-charging sealing device, it is desirable to break through original slag input sealing knot
The single feature of structure, by spiral and pocket slag, will walk slag channel cycle, accomplish it is good be association of activity and inertia, be allowed to be let out in the absence of lime-ash
Leakage passage, reaches slag anti-leaking purpose.Improvement of these sealing devices to the lag cooler sealing property under condition of normal pressure is helpful,
But the sealing property of lag cooler under pressurized state is not can solve the problem that still.
CN201241109Y then discloses a kind of powder coal gasification lock bucket slag discharging apparatus of pressurization circulating fluid bed, by dreg-locking hopper
Lock hopper slag bath, dreg-locking hopper can,douche and slag pool pump constitute a circulatory system, eliminate some lock hopper circulating pumps, also eliminate spiral shell
Rotation lag cooler.This method is similar with wet-process deslagging in pressurized entrained-bed, wet method after directly being cooled down to lime-ash with water Quench
Deslagging, although by saving screw cinder cooling apparatus in technological process, the sealing for indirectly avoiding slag cooler under pressurized state is let out
Leakage problem, but substantial amounts of ash slag waste water can be produced during the wet-process deslagging of washing lime-ash, bring tired to subsequent wastewater treatment
It is difficult.
In sum, the development of pressurized circulating fluidized bed technology still catch a cold slag secret envelope etc. deslagging problem office
Limit, it is necessary to develop a kind of pressurized circulating fluidized bed slag-draining device and method, solve the problems, such as the deslagging under pressurized state, improves
Dreg removing system safety in operation and reliability.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the shortcoming of prior art, solve lag cooler under the conditions of pressurized gasification
Easy seal leakage and the deslagging problem such as stuck, so that dreg removing system can steadily in the long term be transported under the conditions of pressurized gasification
OK, improve production efficiency.
In order to realize above-mentioned technology design, the technical scheme is that there is provided a kind of pressurized circulating fluidized bed deslagging
Device and method, improves the sealing reliability and safety in operation of dreg removing system.
The technical scheme is that：A kind of pressurized circulating fluidized bed Slagoff method is：Gasification furnace bottom connection slag is received
Collection room 2 and slag blowdown vessel 3, using cooling water and the distinctive geomantic omen of Quench gas mode cooling down high-temperature cold altogether in slag collecting chamber 2
High pressure lime-ash, the Quench gas for carrying lime-ash secretly out enters the purification Posterior circle utilization of cyclone separator 6 from lock hopper afterwards.Band after cooling
Pressure lime-ash falls into slag blowdown vessel 3, and slag bath 5 is entered after being decompressed to normal pressure.
Present invention be characterized in that：The bottom of gasification furnace 1 connects slag collecting chamber 2 and slag blowdown vessel 3, the profit in slag collecting chamber 2
With cooling water and synthesis gas Quench cooling down high-temperature high pressure lime-ash, the Quench gas of entrainment lime-ash from slag collecting chamber 2, out revolve afterwards by entrance
The isolation of purified Posterior circle of wind separator 6 is utilized, and the lime-ash with pressure after cooling falls into slag blowdown vessel 3, entered after being decompressed to normal pressure
Slag bath 5.
Preferably, slag collecting chamber 2 is externally provided with protection water leg 10 and cools down with gasification furnace bottom linkage section slag-drip opening 7, and slag is received
Coiled water-cooling structure is put in collection interior, and cooling water inlet 11 and outlet 12 are set on outer wall.
Preferably, gasification furnace generation a part of synthesis gas it is purified pressurization and cooling after, as sharp cool-air feed slag receive
Collection room 2；Collecting chamber bottom side is provided with sharp cold air inlet 8, and opposite side sets Quench gas outlet damper 14 and Quench conductance tracheae
15, wireway 15 is connected with the arrival end of cyclone separator 6, wireway axis and housing into angle α 30-90 ° of scope, preferably
75 °, gas flow rate is 10m/s-17m/s in wireway.
Preferably, annular gas distribution grid 13 is provided with slag collecting chamber conical lower portion tank, 1-8 circles is disposed with distribution grid
Fumarole 16, fumarole is circular hole, pore diameter range 1mm-40mm, each circle jet hole number 2-100.
Preferably, pressurising pipeline 9 is provided with slag blowdown vessel 3, is connected with blowdown line 17 to ash-pit 4, slag row can be met
The technological requirement of pressure release pressurising in tank is put, connection slag bath 5 in the bottom of slag blowdown vessel 3 is provided with shower water in slag bath.
Mentality of designing of the invention：HTHP lime-ash first through being cooled in slag collecting chamber, after let out in slag blowdown vessel
Slag bath is emitted into after pressure drop pressure.Cooling water is carried out to lime-ash in slag collecting chamber and synthesis gas Quench is cooled down jointly：Collected in slag
The cooling of indoor setting water-cooled coil pipe, at the same by the use of gasification furnace generation a part of synthesis gas by after purification pressurization cooling as following
Ring swashs cool-air feed slag collecting chamber.Circulation Quench gas from slag blowdown vessel entrainment lime-ash out is new with gasification furnace after wireway
Cyclone separator is gone to after generation synthesis gas mixing, the gas after separation enters subsequent gases purification process, and the lime-ash of separation enters
Enter and gasify again in gasification furnace.In slag collecting chamber, lime-ash is subject to rising and the translation active force of synthesis gas Quench air-flow, with water
Cold water tube wall multiple-contact fully exchanges heat, and experiences Selective Separation again in Quench gas outlet guide tracheal strips solid lime-ash, more not
Fully smaller or lighter its own gravity deficiency of solid lime-ash of reaction is swashed with overcoming the lime-ash of the active force of air-flow with circulation
Cold airflow enters gasification furnace cycle gasification again after entering cyclone separator, and remaining lime-ash is eventually fallen into slag blowdown vessel.For
Prevent the lime-ash from slag-drip opening to be out directly entered wireway, baffle plate is set in the Quench gas port of export, lime-ash is collected in slag
Indoor forced heat-exchanging.HTHP lime-ash falls into slag blowdown vessel, in slag blowdown vessel after the cooling of slag collecting chamber apoplexy water cooling
Be connected with slag collecting chamber again after realizing pressure release deslagging and pressurising, complete an ash discharge slag flow, in last slag bath lime-ash by
Dragveyer is transported after pulling out.
The present invention also has the advantages that：
1. new pressurized circulating fluidized bed deslagging technological process compared with prior art, is developed, is eliminated positioned at gasification
The screw cinder cooling apparatus of furnace bottom, solve indirectly under the conditions of pressurized gasification the easy seal leakage of lag cooler and it is stuck the problems such as.
So that dreg removing system can steadily in the long term run under the conditions of pressurized gasification, maintenance cost is saved, improve production effect
Rate.
2. the dreg removing system of present invention design can run at high temperature under high pressure, due to not having mechanical rotation equipment, not allow
Easily break down.Can be very good to realize the band press operation of system, step-down technical process is simple, pressurising and pressure leak process reliability
High, good sealing effect, service life of equipment is long, reliability is high.Which solve pressurized bulk Circulating Fluidized Bed Process development process
The technical problem of middle dreg removing system pressure-bearing.
3. the lime-ash of HTHP is cooled down using Quench gas and the distinctive geomantic omen of cooling water mode cold altogether, swashed
Cold air can more fully mix with high-temperature ash and contact, at the same can also make under the entrainment effect of Quench air-flow lime-ash with
Cooling water tube wall is more fully contacted, and is increased heat exchange area and is extended heat-exchange time simultaneously, therefore can improve heat exchange efficiency, together
Shi Tigao lime-ash cooling treatment amounts.Most of heat in chilling process can reclaim lime-ash, accomplishes heat recovery and utilization.
4. circulation Quench gas entrainment portions fine ash slag is again introduced into gasification furnace after returning to multi-cycle separation device, is circulated again
Gasification increases circulating ratio, has to utilize and improves gasification efficiency.Quench gas and synthesis gas mixing are circulated simultaneously, can reduce one-level
The inlet temperature of cyclone separator, protection equipment.
5. the lime-ash after decrease temperature and pressure eventually falls into slag bath, the effective device that avoids is transported and preserved under hygrometric state and is showed
The flying dust dust pollution of field, will not bring burden with hourly water consumption seldom to follow-up sewage disposal.
Brief description of the drawings
A kind of pressurized circulating fluidized bed slag-draining device and method flow diagram that Fig. 1 is provided for the present invention；
A kind of pressurized circulating fluidized bed slag-draining device slag collecting chamber structure chart that Fig. 2 is provided for the present invention；
A kind of pressurized circulating fluidized bed slag-draining device distributing plate structure figure that Fig. 3 is provided for the present invention.
Description of reference numerals：
1st, gasification furnace；2nd, slag collecting chamber；3rd, slag blowdown vessel；4th, ash-pit；5th, slag bath；6th, cyclone separator；7th, ash discharge slag
Mouthful；8th, cold air inlet is swashed；9th, pressurising pipeline；10th, water leg；11st, cooling water inlet；12nd, coolant outlet；13rd, gas point
Fabric swatch；14th, baffle plate；15th, Quench gas outlet wireway；16th, stomata；17th, blowdown line.
Specific embodiment
To become apparent the present invention, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Embodiment
As shown in figure 1, be a kind of pressurized circulating fluidized bed slag-draining device that provides of the present invention and method schematic diagram, including
Following steps：The bottom of gasification furnace 1 connects slag collecting chamber 2 and slag blowdown vessel 3, and cooling water and synthesis gas are utilized in slag collecting chamber 2
Quench cooling down high-temperature high pressure lime-ash, carries the Quench gas of lime-ash secretly from lock hopper out afterwards into following after the isolation of purified of cyclone separator 6
Ring is utilized, and the lime-ash with pressure after cooling falls into slag blowdown vessel 3, is entered after being decompressed to normal pressure after slag bath 5 after being pulled out through dragveyer
Discharge.
In slag collecting chamber 2, geomantic omen is carried out to lime-ash cold altogether：The built-in coiled water-cooling structure of slag collecting chamber 2, sets on outer wall
Put cooling water inlet 11 and outlet 12.Quench gas is sprayed into from entrance through on gas distribution grid 13 circular stomata 16, carries lime-ash secretly
After fully being exchanged heat with the water-cooled coil pipe in slag collecting chamber 2, solid lime-ash experiences selection again in Quench gas outlet wireway 15
Property separate, more not sufficiently reactive smaller or lighter its own gravity deficiency of solid lime-ash is overcoming the ash of the active force of air-flow
Slag enters with circulation Quench air-flow and enters gasification furnace cycle gasification again after cyclone separator 6, and remaining lime-ash eventually falls into slag
In blowdown vessel 3.Cut off the connection of slag collecting chamber 2 and deslagging tank 3 after a period of time, slag blowdown vessel 3 through the pressure release of blowdown line 17 extremely
Ash-pit 4, lime-ash is emitted into slag bath 5, and slag blowdown vessel is connected with slag collecting chamber 2 again after the pressurising of pressurising pipeline 9 afterwards, completes
One ash discharge slag flow, transports after lime-ash is pulled out by dragveyer in slag bath.
Example 1
As a example by day output with coal as raw material is 600 tons of circulation fluidized bed coal gasifying device, vapor pressure is
0.6MPa, gasification temperature is 1050 DEG C, and efficiency of carbon con version is higher than 93%, the device generation Nm3/h of gas yield 57420, and lime-ash is about
6000kg/h.After the purified synthesis gas of device generation, a part of gas enters downstream process, the synthesis gas of another part about 17%
After being pressurizeed through compressor, but device water cooled if necessary is cooled to 110 DEG C or so, and cool-air feed slag collecting chamber is swashed as circulation.Ash
Slag uses cooling water and the circulation common Quench of Quench gas from being fallen into gasification furnace in slag collecting chamber in slag collecting chamber.Its operation
Parameter and accessible main performance index are as follows：
Quench throughput：9841 Nm3/h；
Quench gas inlet temperature：110℃；
Quench gas outlet temperature：200℃；
Cooling water inflow 5400kg/h；
Cooling water inlet temperature：40℃；
Cooling water outlet temperature：80℃；
Lime-ash inlet temperature：900℃；
Lime-ash outlet temperature：200℃；
In slag collecting chamber, lime-ash is synthesized gas entrainment and is fully contacted heat exchange with water-cooled coil pipe, in Quench gas and chilled water
Common cooling effect under, the cooled cooling of lime-ash.When exporting air guide by Quench gas, air velocity is about 13m/s, and lime-ash is received
Selective Separation is again passed by with the active force influence for rising Quench air-flow to self gravitation, the lime-ash quilt of about 5%-10% in lime-ash
The entrainment of Quench air-flow enters cyclone separator purification, and remaining lime-ash is fallen into slag blowdown vessel.Pressure release is to normal in slag blowdown vessel
Fallen into slag bath after pressure, transported after finally being pulled out by dragveyer.
As can be seen here, the present invention efficiently solves under the conditions of pressurized gasification the easy seal leakage of lag cooler and the deslagging such as stuck
Problem, so that dreg removing system can steadily in the long term run under the conditions of pressurized gasification, has saved maintenance cost, improves life
Efficiency is produced, with obvious technological innovation advantage.
Claims (6)
1. pressurized circulating fluidized bed slag-draining device, including：Slag collecting chamber (2), slag blowdown vessel (3), slag bath (5) and cyclonic separation
Device (6), it is characterised in that：
Slag collecting chamber (2) and slag blowdown vessel (3) are connected with the bottom of gasification furnace (1), slag blowdown vessel (3) is arranged on slag collecting chamber
(2) lower section；
A part of synthesis gas by the use of gasification furnace generation is entered as circulation Quench gas by after purification pressurization cooling by Quench gas
Mouth (8) supply slag collecting chamber；Quench gas is exported after wireway (15) enters cyclone separator (6) isolation of purified through slag collecting chamber and followed
Ring is utilized, and the lime-ash with pressure after cooling falls into slag blowdown vessel (3), slag bath (5) is entered after being decompressed to normal pressure；
Slag collecting chamber (2) bottom side is provided with sharp cold air inlet (8)；Opposite side sets Quench gas outlet damper (14) and wireway
(15), wireway (15) is connected with cyclone separator (6) arrival end.
2. pressurized circulating fluidized bed slag-draining device as claimed in claim 1, it is characterised in that：
Slag collecting chamber (2) is externally provided with protection water leg (10) cooling, slag collecting chamber with gasification furnace bottom linkage section slag-drip opening (7)
(2) built-in coiled water-cooling structure, the cooling medium of disk Bottomhole pressure is cooling water or water vapour, cooling water is set on outer wall and is entered
Mouth (11) and outlet (12).
3. pressurized circulating fluidized bed slag-draining device as claimed in claim 2, it is characterised in that：Wireway axis and housing into
30-90 ° of the scope of angle α, gas flow rate is 10m/s-17m/s in wireway.
4. pressurized circulating fluidized bed slag-draining device as claimed in claim 3, it is characterised in that：Slag collecting chamber (2) conical bottom
Annular gas distribution grid (13) is provided with portion's tank, 1-8 is disposed with distribution grid and is enclosed fumarole (16), fumarole is circular hole, hole
Footpath scope 1mm-40mm, each circle jet hole number 2-100.
5. pressurized circulating fluidized bed slag-draining device as claimed in claim 4, it is characterised in that：Set on slag blowdown vessel (3)
There is pressurising pipeline (9), be connected with blowdown line (17) to ash-pit (4), the technological requirement of pressure release pressurising in slag blowdown vessel can be met,
Slag blowdown vessel (3) bottom connects slag bath (5), and shower water is provided with slag bath.
6. pressurized circulating fluidized bed slag-draining device as claimed in claim 3, it is characterised in that：Wireway axis and housing into
Angle α is 75 °.
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| CN201510114540.7A CN104650990B (en) | 2015-03-16 | 2015-03-16 | Pressurized circulating fluidized bed slag-draining device |
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| CN201510114540.7A CN104650990B (en) | 2015-03-16 | 2015-03-16 | Pressurized circulating fluidized bed slag-draining device |
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| CN104650990A CN104650990A (en) | 2015-05-27 |
| CN104650990B true CN104650990B (en) | 2017-05-31 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106833756A (en) * | 2015-12-04 | 2017-06-13 | 大唐国际化工技术研究院有限公司 | The residue extraction mechanism and Slagoff method of a kind of solid slag discharging gasifying furnace |
| CN107238077A (en) * | 2017-05-18 | 2017-10-10 | 东南大学 | A kind of recirculating fluidized bed pressurized oxy-coal combustion device and its application |
| CN107477599A (en) * | 2017-09-05 | 2017-12-15 | 邢强 | Cinder from refuse incineration cooling system |
| CN110846080A (en) * | 2019-11-25 | 2020-02-28 | 大唐东北电力试验研究院有限公司 | Biomass positive-pressure circulating fluidized bed gasification furnace fly ash cooling system |
| CN111978993B (en) * | 2020-07-17 | 2022-01-07 | 新奥科技发展有限公司 | Pressure reducing device and coke discharging system |
| CN112961707B (en) * | 2021-02-19 | 2022-06-24 | 新奥科技发展有限公司 | Fly ash furnace returning device, coal catalytic gasification system and fly ash furnace returning method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2740609Y (en) * | 2004-09-10 | 2005-11-16 | 陕西秦能天脊科技有限公司 | Powdery coal gasifier of pressurized selecting ash-ejecting fluidized bed |
| US8529645B2 (en) * | 2007-10-03 | 2013-09-10 | Arizona Public Service Company | Hydrogasification reactor and method of operating same |
| CN201241109Y (en) * | 2008-05-20 | 2009-05-20 | 山西丰喜肥业（集团）股份有限公司临猗分公司 | Powder coal gasification lock bucket slag discharging apparatus of pressurization circulating fluid bed |
| CN102732325A (en) * | 2012-07-06 | 2012-10-17 | 东南大学 | High-pressure and high-temperature furnace slag wind and water cooling and deslagging device |
| CN203238227U (en) * | 2013-04-15 | 2013-10-16 | 中国五环工程有限公司 | System for pressurized fluidized bed |
| CN204162667U (en) * | 2014-11-04 | 2015-02-18 | 上海锅炉厂有限公司 | A kind of ash agglomerating gasification reactor apparatus |
| CN204661623U (en) * | 2015-03-16 | 2015-09-23 | 上海锅炉厂有限公司 | A kind of pressurized circulating fluidized bed slag discharging device |
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