CN104650990A - Slag discharging device for pressurized circulating fluidized bed - Google Patents
Slag discharging device for pressurized circulating fluidized bed Download PDFInfo
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- CN104650990A CN104650990A CN201510114540.7A CN201510114540A CN104650990A CN 104650990 A CN104650990 A CN 104650990A CN 201510114540 A CN201510114540 A CN 201510114540A CN 104650990 A CN104650990 A CN 104650990A
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- slag
- collecting chamber
- ash
- discharging device
- fluidized bed
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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
Abstract
The invention discloses a slag discharging device for a pressurized circulating fluidized bed; the slag discharging device is characterized in that high-temperature and high-pressure ash slag is discharged after the temperature is reduced at first and then the pressure is reduced; the bottom of a gasification furnace is connected to a slag collecting chamber and a slag discharging tank; the high-temperature and high-pressure ash slag is cooled in the slag collecting chamber by utilizing the special cooling water and synthesis gas chilled wind and water common cooling manner; chilling gas mixed with the ash slag enters a cyclone separator through an outlet gas guide pipe of the slag collecting chamber so as to be recycled after being separated and purified; the pressurized ash slag, the temperature of which is decreased, falls into the slag discharging tank; and, after the pressure is decreased to normal pressure, the ash slag is discharged into a slag tank and then is taken out and discharged through a slag dragging machine. According to the slag discharging device through a pressurization dry method designed in the invention, a spiral slag cooler is omitted; the problems that the slag cooler is easy to leak sealing, lock and the like under pressurization and gasification conditions are effectively solved; therefore, a slag discharging system can be operated stably for a long time under the pressurization and gasification conditions; the maintenance cost is saved; and the production efficiency is increased.
Description
Technical field
The present invention relates to a kind of pressurized circulating fluidized bed slag discharging device.
Background technology
Circulating fluidized bed is due to higher feedstock circulation multiplying power, and higher heat transfer, rate of mass transfer, be widely used in gasification and field of boilers, is particularly suitable for the utilization of China's low grade coal.Current fluidizer is mature on the whole in Large Atmosphere Pressure gasification, but it is low to there is production intensity in atmospheric unit, abilityscale is little, counter investment is high, the unfavorable factors such as compression power consumption is high, pressurized bulk gasification technology is the developing direction of Coal Chemical Industry, and pressurized bulk Circulating Fluidized Bed Process immature, one of technical problem is in gasification deslagging.
It is the screw cinder cooling apparatus deslagging of medium that the normal pressure fluidized bed traditional at present all adopts with water coolant, to be applied in the deslagging technique of pressure circulating fluid bed fine coal gasifying stove in the deslagging mode of this screw cinder cooling apparatus in actual production, operation conditions is very poor, be embodied in: the slag that vapourizing furnace is discharged is carried by running device, the impact of cooling power, and safe and stable operation situation is poor; The joint effect of the factors such as the stopping property poor performance under running device high temperature, pressurization operating mode and the temperature height of discharge slag, thus cause whole system can not long period smooth running, the requirement of pressure circulating fluid bed fine coal gasifying stove deslagging technique cannot be met.Therefore how improving the safety in operation of slag cooler and sealing reliability and the deslagging problem under solving pressurized state is the direction that technician needs to study.
CN201074833Y discloses a kind of Autoimmunization sealing clinker-removing device, wishes that lower ash output cinder notch is located in sealed cistern, and the mode be connected with spiral propeller improves the sealing property of lag cooler by installing step-down gear in one end of lag cooler spiral propeller.CN203893204U discloses a kind of lag cooler dreg-charging sealing device, ites is desirable to break through the single feature of original slag input sealed structure, by spiral and pocket slag, slag channel cycle will be walked, accomplish good being association of activity and inertia, make it to there is not lime-ash leakage path, reach slag anti-leaking object.The improvement of these tightness systems to the lag cooler sealing property under condition of normal pressure is helpful, but the sealing property of lag cooler under still not having to solve pressurized state.
CN201241109Y then discloses a kind of powder coal gasification lock bucket slag discharging apparatus of pressurization circulating fluid bed, forms a recycle system by dreg-locking hopper lock hopper slag bath, dreg-locking hopper flush pot and slag pool pump, eliminates some lock hopper recycle pumps, also eliminates screw cinder cooling apparatus.In this method and pressurized entrained-bed, wet-process deslagging is similar, by water Quench, the rear wet-process deslagging of directly cooling is carried out to lime-ash, although by saving screw cinder cooling apparatus in technical process, indirectly avoid the sealing leak problem of slag cooler under pressurized state, but a large amount of ash slag waste waters can be produced in the wet-process deslagging process of washing lime-ash, bring difficulty to subsequent wastewater treatment.
In sum, the development of pressurized circulating fluidized bed Technology is still caught a cold the limitation of problem such as deslagging such as slag secret envelope grade, be necessary a kind of pressurized circulating fluidized bed slag discharging device of exploitation and method, solve the deslagging problem under pressurized state, improve dreg removing system safety in operation and reliability.
Summary of the invention
The technical problem to be solved in the present invention is: the shortcoming overcoming prior art, to solve under pressurized gasification condition the easy seal leakage of lag cooler and the deslagging problem such as stuck, thus dreg removing system can steady in a long-termly under pressurized gasification condition be run, enhance productivity.
In order to realize above-mentioned technical conceive, technical scheme of the present invention there is provided a kind of pressurized circulating fluidized bed slag discharging device and method, improves sealing reliability and the safety in operation of dreg removing system.
Technical scheme of the present invention is: pressurized circulating fluidized bed a kind of Slagoff method is: connect slag collecting chamber 2 and slag blowdown vessel 3 bottom vapourizing furnace, in slag collecting chamber 2, utilize water coolant and the distinctive geomantic omen of Quench gas to be total to cold mode cooling down high-temperature high pressure lime-ash, the Quench gas carrying lime-ash secretly out enters cyclonic separator 6 afterwards from lock hopper and purifies Posterior circle utilization.Lime-ash with pressure after cooling falls into slag blowdown vessel 3, enters slag bath 5 after being decompressed to normal pressure.
The present invention is characterized in that: connect slag collecting chamber 2 and slag blowdown vessel 3 bottom vapourizing furnace 1, water coolant and synthetic gas Quench cooling down high-temperature high pressure lime-ash is utilized in slag collecting chamber 2, the Quench gas carrying lime-ash secretly out enters cyclonic separator 6 isolation of purified Posterior circle afterwards from slag collecting chamber 2 and utilizes, lime-ash with pressure after cooling falls into slag blowdown vessel 3, enters slag bath 5 after being decompressed to normal pressure.
Preferably, be provided with outside linkage section slag-drip opening 7 bottom slag collecting chamber 2 and vapourizing furnace and protect water jacket 10 to cool, the built-in coil tube type water-cooling structure of slag collecting chamber, outer wall is arranged cooling water inlet 11 and exports 12.
Preferably, vapourizing furnace generate a part of synthetic gas through purification pressurization and cooling after, as sharp cool-air feed slag collecting chamber 2; Bottom collecting chamber, side is provided with sharp cold air inlet 8, opposite side arranges Quench gas outlet damper 14 and Quench conductance tracheae 15, airway 15 is connected with cyclonic separator 6 inlet end, airway axis becomes the scope 30-90 ° of angle α with housing, preferably 75 °, in airway, gas flow rate is 10m/s-17m/s.
Preferably, be provided with annular gas grid distributor 13 in slag collecting chamber conical lower portion tank, grid distributor is furnished with 1-8 and encloses gas orifice 16, gas orifice is circular hole, pore diameter range 1mm-40mm, each circle gas orifice quantity 2-100.
Preferably, slag blowdown vessel 3 is provided with pressurising pipeline 9, is connected with blowdown line 17 to ash-pit 4, the processing requirement of pressure release pressurising in slag blowdown vessel can be met, connect slag bath 5 bottom slag blowdown vessel 3, in slag bath, be provided with spray water.
Mentality of designing of the present invention: High Temperature High Pressure lime-ash first cools in slag collecting chamber, after in slag blowdown vessel, be disposed to slag bath after pressure release step-down.In slag collecting chamber, water coolant is carried out to lime-ash and synthetic gas Quench cools jointly: the cooling of water-cooled coil pipe is set in slag collecting chamber, a part of synthetic gas simultaneously utilizing vapourizing furnace to generate after purification pressurization cooling as the sharp cool-air feed slag collecting chamber of circulation.Go to cyclonic separator from the slag blowdown vessel circulation Quench gas carrying lime-ash secretly synthetic gas newly-generated with vapourizing furnace after airway out after mixing, the gas after separation enters subsequent gases purification process, and the lime-ash of separation enters in vapourizing furnace and again gasifies.In slag collecting chamber, lime-ash is subject to rising and the translation reactive force of synthetic gas Quench air-flow, with the abundant heat exchange of water-cooled water wall multiple-contact, again selective separation is experienced at Quench gas outlet guide tracheal strips solid lime-ash, less or lighter himself gravity deficiency of solid lime-ash of fully reaction is not to overcome the lime-ash of the reactive force of air-flow, enter vapourizing furnace cycle gasification again after entering cyclonic separator with circulation Quench air-flow, remaining lime-ash finally falls into slag blowdown vessel.In order to prevent directly entering airway from slag-drip opening lime-ash out, baffle plate being set at Quench gas exit end, making lime-ash forced heat-exchanging in slag collecting chamber.High Temperature High Pressure lime-ash is after slag collecting chamber apoplexy water cooling cooling, and fall into slag blowdown vessel, realize pressure release deslagging and be again connected with slag collecting chamber with after pressurising in slag blowdown vessel, complete an ash discharge slag flow process, in last slag bath, lime-ash transports after being pulled out by dragveyer.
The present invention also has following beneficial effect:
1. compared with prior art, develop new pressurized circulating fluidized bed deslagging technical process, eliminate the screw cinder cooling apparatus be positioned at bottom vapourizing furnace, indirectly to solve under pressurized gasification condition the easy seal leakage of lag cooler and the problem such as stuck.Thus dreg removing system can steady in a long-termly under pressurized gasification condition be run, save maintenance cost, improve production efficiency.
2. the dreg removing system of the present invention's design can run at high temperature under high pressure, owing to not having mechanical rotation equipment, is not easy to break down.The band press operation of system can well be realized, step-down technological process is simple, pressurising and pressure leak process reliability is high, good sealing effect, service life of equipment is long, reliability is high.Which solve the technical problem of dreg removing system pressure-bearing in pressurized bulk Circulating Fluidized Bed Process performance history.
3. utilize Quench gas and the distinctive geomantic omen of water coolant to be total to the cold lime-ash of mode to High Temperature High Pressure to cool, Quench gas can mix more fully with high-temperature ash and contacts, under the effect of carrying secretly of Quench air-flow, lime-ash also can be made to contact more fully with water coolant tube wall simultaneously, increase heat interchanging area and extend heat-exchange time simultaneously, therefore can improve heat exchange efficiency, improve lime-ash cooling process amount simultaneously.The most of heat in lime-ash can be reclaimed at chilling process, accomplish heat recovery and utilization.
4. again enter in vapourizing furnace after the thin lime-ash of circulation Quench gas entrainment portions gets back to multi-cycle separation device, cycle gasification increases circulation ratio again, has to utilize to improve gasification efficiency.The gas of circulation Quench simultaneously and synthetic gas mixing, can reduce the temperature in of primary cyclone, proterctive equipment.
5. the lime-ash after decrease temperature and pressure finally falls into slag bath, and under hygrometric state, transport and preservation effectively avoid the flying dust dust pollution at device scene, little with hourly water consumption, bring burden can not to follow-up sewage disposal.
Accompanying drawing explanation
Fig. 1 is a kind of pressurized circulating fluidized bed slag discharging device provided by the invention and method flow diagram;
Fig. 2 is a kind of pressurized circulating fluidized bed slag discharging device slag collecting chamber structure iron provided by the invention;
Fig. 3 is a kind of pressurized circulating fluidized bed slag discharging device distributing plate structure figure provided by the invention.
Description of reference numerals:
1, vapourizing furnace; 2, slag collecting chamber; 3, slag blowdown vessel; 4, ash-pit; 5, slag bath; 6, cyclonic separator; 7, ash discharge cinder notch; 8, cold air inlet is swashed; 9, pressurising pipeline; 10, water jacket; 11, cooling water inlet; 12, cooling water outlet; 13, gas distribution grid; 14, baffle plate; 15, Quench gas outlet guide tracheae; 16, pore; 17, blowdown line.
Embodiment
For making the present invention become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Embodiment
As shown in Figure 1, for a kind of pressurized circulating fluidized bed slag discharging device provided by the invention and method schematic diagram, comprise the following steps: bottom vapourizing furnace 1, connect slag collecting chamber 2 and slag blowdown vessel 3, water coolant and synthetic gas Quench cooling down high-temperature high pressure lime-ash is utilized in slag collecting chamber 2, the Quench gas carrying lime-ash secretly out enters cyclonic separator 6 isolation of purified Posterior circle afterwards from lock hopper and utilizes, lime-ash with pressure after cooling falls into slag blowdown vessel 3, through dragveyer pull after discharges after entering slag bath 5 after being decompressed to normal pressure.
In slag collecting chamber 2, geomantic omen is carried out to lime-ash and is total to cold: the built-in coil tube type water-cooling structure of slag collecting chamber 2, outer wall is arranged cooling water inlet 11 and outlet 12.Quench gas from entrance through gas distribution grid 13 circular pore 16 spray into, after carrying the abundant heat exchange of water-cooled coil pipe in lime-ash and slag collecting chamber 2 secretly, in Quench gas outlet guide tracheae 15, solid lime-ash experiences selective separation again, enter vapourizing furnace cycle gasification again after less or lighter himself gravity deficiency of solid lime-ash of fully reaction does not enter cyclonic separator 6 with the lime-ash overcoming the reactive force of air-flow with circulation Quench air-flow, remaining lime-ash finally falls into slag blowdown vessel 3.The connection of slag collecting chamber 2 and deslagging tank 3 is cut off after for some time, slag blowdown vessel 3 through blowdown line 17 pressure release to ash-pit 4, lime-ash is disposed to slag bath 5, slag blowdown vessel is again connected with slag collecting chamber 2 after pressurising pipeline 9 pressurising afterwards, complete an ash discharge slag flow process, in slag bath, lime-ash transports after being pulled out by dragveyer.
Example 1
Take coal as the day output of raw material be the circulation fluidized bed coal gasifying device of 600 tons be example, vapor pressure is 0.6MPa, and gasification temperature is 1050 DEG C, and efficiency of carbon conversion is higher than 93%, and device generates gas yield 57420 Nm3/h, and lime-ash is about 6000kg/h.After the purified synthesis gas that device generates, a part of gas enters downstream process, and the synthetic gas of another part about 17%, after compressor pressurization, is cooled to about 110 DEG C through watercooler if desired, swashs cool-air feed slag collecting chamber as circulation.Lime-ash falls into slag collecting chamber in vapourizing furnace, adopts water coolant and the common Quench of circulation Quench gas in slag collecting chamber.Its operating parameters and accessible main performance index as follows:
Quench airshed: 9841 Nm
3/ h;
Quench gas temperature in: 110 DEG C;
Quench gas temperature out: 200 DEG C;
Cooling water inflow 5400kg/h;
Cooling water inlet temperature: 40 DEG C;
Cooling water outlet temperature: 80 DEG C;
Lime-ash temperature in: 900 DEG C;
Lime-ash temperature out: 200 DEG C;
In slag collecting chamber, lime-ash is synthesized gas and carries contact heat-exchanging abundant with water-cooled coil pipe secretly, under the common cooling effect of Quench gas and chilled water, and the cooled cooling of lime-ash.During by Quench gas outlet air guide, gas velocity is about 13m/s, the reactive force that lime-ash is subject to self gravitation and rising Quench air-flow affects again through selective separation, and in lime-ash, the lime-ash of about 5%-10% is entered cyclonic separator purification by Quench airflow entrainment, and remaining lime-ash falls into slag blowdown vessel.In slag blowdown vessel, fall into slag bath after pressure release to normal pressure, transport after finally being pulled out by dragveyer.
As can be seen here, the present invention to efficiently solve under pressurized gasification condition the easy seal leakage of lag cooler and the deslagging problem such as stuck, thus dreg removing system can steady in a long-termly under pressurized gasification condition be run, and has saved maintenance cost, improve production efficiency, there is obvious technological innovation advantage.
Claims (5)
1. pressurized circulating fluidized bed slag discharging device, comprising: slag collecting chamber (2), slag blowdown vessel (3), slag bath (5) and cyclonic separator (6), is characterized in that:
Be connected with slag collecting chamber (2) and slag blowdown vessel (3) in the bottom of vapourizing furnace (1), slag blowdown vessel (3) is arranged on slag collecting chamber (2) below;
Quench gas enters cyclonic separator (6) isolation of purified Posterior circle through slag collecting chamber outlet guide tracheae (15) and utilizes, and the lime-ash with pressure after cooling falls into slag blowdown vessel (3), enters slag bath (5) after being decompressed to normal pressure.
2. slag discharging device pressurized circulating fluidized bed as claimed in claim 1, is characterized in that:
Being provided with outside linkage section slag-drip opening (7) bottom slag collecting chamber (2) and vapourizing furnace protects water jacket (10) to cool; the built-in coil tube type water-cooling structure of slag collecting chamber (2); the heat-eliminating medium of dish Bottomhole pressure is water coolant or water vapor, outer wall is arranged cooling water inlet (11) and outlet (12).
3. slag discharging device pressurized circulating fluidized bed as claimed in claim 2, is characterized in that: side, slag collecting chamber (2) bottom is provided with sharp cold air inlet (8); Opposite side arranges Quench gas outlet damper (14) and airway (15), airway (15) is connected with cyclonic separator (6) inlet end, airway axis becomes the scope 30-90 ° of angle α with housing, preferably 75 °, and in airway, gas flow rate is 10m/s-17m/s.
4. slag discharging device pressurized circulating fluidized bed as claimed in claim 3, it is characterized in that: in slag collecting chamber (2) conical lower portion tank, be provided with annular gas grid distributor (13), grid distributor is furnished with 1-8 and encloses gas orifice (16), gas orifice is circular hole, pore diameter range 1mm-40mm, each circle gas orifice quantity 2-100.
5. slag discharging device pressurized circulating fluidized bed as claimed in claim 4, it is characterized in that: slag blowdown vessel (3) is provided with pressurising pipeline (9), be connected with blowdown line (17) to ash-pit (4), the processing requirement of pressure release pressurising in slag blowdown vessel can be met, slag blowdown vessel (3) bottom connects slag bath (5), is provided with spray water in slag bath.
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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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Cited By (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 |
| CN111978993A (en) * | 2020-07-17 | 2020-11-24 | 新奥科技发展有限公司 | Pressure reducing device and coke discharging system |
| CN112961707A (en) * | 2021-02-19 | 2021-06-15 | 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 |
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| CN112961707A (en) * | 2021-02-19 | 2021-06-15 | 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 |
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