CN110387267A - Bottom ash treatment device and bottom ash treatment method for fluidized-bed gasification furnace - Google Patents
Bottom ash treatment device and bottom ash treatment method for fluidized-bed gasification furnace Download PDFInfo
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- CN110387267A CN110387267A CN201810345858.XA CN201810345858A CN110387267A CN 110387267 A CN110387267 A CN 110387267A CN 201810345858 A CN201810345858 A CN 201810345858A CN 110387267 A CN110387267 A CN 110387267A
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- bottom ash
- treatment device
- ash treatment
- gasification furnace
- fluidized
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- 239000010882 bottom ash Substances 0.000 title claims abstract description 128
- 238000002309 gasification Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000010802 sludge Substances 0.000 claims abstract description 60
- 239000002893 slag Substances 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000010304 firing Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 101
- 239000007800 oxidant agent Substances 0.000 claims description 47
- 230000001590 oxidative effect Effects 0.000 claims description 47
- 239000002826 coolant Substances 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 230000008901 benefit Effects 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 239000003034 coal gas Substances 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000000428 dust Substances 0.000 description 11
- 239000003245 coal Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- 239000000446 fuel Substances 0.000 description 9
- 239000003517 fume Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 210000001520 comb Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- C10J3/72—Other features
-
- 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
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1625—Integration of gasification processes with another plant or parts within the plant with solids treatment
- C10J2300/1628—Ash post-treatment
-
- 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
- C10J2300/00—Details of gasification processes
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1861—Heat exchange between at least two process streams
- C10J2300/1892—Heat exchange between at least two process streams with one stream being water/steam
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Gasification And Melting Of Waste (AREA)
- Industrial Gases (AREA)
Abstract
The present invention provides a kind of bottom ash treatment devices (2) for fluidized-bed gasification furnace, there is the bottom ash treatment device (2) warm sludge entrance and cold slag to export, the warm sludge entrance with gasification furnace (1) for connecting to receive warm sludge (D), the cold slag outlet is for being discharged cold slag (K), and the bottom ash treatment device (2) is configured as firing warm sludge (D) again and cooling treatment.The present invention also provides a kind of bottom ash treatment methods for fluidized-bed gasification furnace.Bottom ash treatment device and bottom ash treatment method according to the present invention for fluidized-bed gasification furnace, carbon content in the bottom ash is low, is not easy slagging, high-efficient, can be energy-saving.
Description
Technical field
The present invention relates to gasification technology fields more particularly to a kind of for the bottom ash treatment device of fluidized-bed gasification furnace and bottom
Slag treatment method.
Background technique
As the clean coal technology of high-efficiency cleaning, gasification technology is to convert the solid-states non-renewable energy such as coal to gaseous state cleaning
The main path of secondary energy sources, the technology are mainly used for synthesizing the chemical industry metallurgicals such as ammonia, synthesizing methanol, hydrogen manufacturing, blast furnace reduction iron production
In industry, combined cycle generation field and industry and domestic gas field.
Classify by the motion state of solid fuel, modern gasification process mainly includes fixed bed gasification method, entrained flow gasification
Method and fluidized gasification method.Fluidized gasification technology is one of earliest industrialized gasification process, and technique is with a level pressure
The gasifying agent of power is blown into from bed lower part by air distribution plate, and the broken coal on bed is held up, and when gasifying agent rises, coal grain is in suspension
State motion rolls up and down, comes into full contact with carry out gasification reaction with gasifying agent.In such technology, including traditional fluidized bed gas
Change technology and ciculation fluidized bed gasification technology developed in recent years.
Currently, fluidized gasification technology has been realized in industrial applications, and obtain good environmental benefit, economic benefit
And social benefit.But from the point of view of the operating condition of existing fluidized-bed gasification furnace, there are the following problems:
(1) carbon content in the bottom ash is high, especially for the lower coal of reactivity, carbon content in the bottom ash >=15%；
(2) operating flexibility of dreg removing system is small, is easy to slagging in tapping process, once slagging, heating gas is easily from deslagging
System is scurried out, and there are severe compromises, influences the long-period stable operation of gasification furnace.
(3) energy consumption and water consume of cold slag system are larger, and fail the sensible heat for sufficiently recycling warm sludge (temperature is greater than 900 DEG C).
Summary of the invention
It is an object of the invention at least partly overcome the deficiencies of existing technologies, provide a kind of for fluidized-bed gasification furnace
Bottom ash treatment device and bottom ash treatment method.
The object of the invention is also to provide a kind of for the bottom ash treatment device of fluidized-bed gasification furnace and bottom ash treatment side
Method solves the problems, such as that existing fluidized gasification coal content in bottom slag is high, improves cold gas efficiency.
The object of the invention is also to provide a kind of for the bottom ash treatment device of fluidized-bed gasification furnace and bottom ash treatment side
Method, it is ensured that fluidized gasification furnace slag discharge is smooth, reduces security risk, realizes long-period stable operation.
The object of the invention is also to provide a kind of for the bottom ash treatment device of fluidized-bed gasification furnace and bottom ash treatment side
Method solves the problems, such as to be easy to slagging in tapping process.
The object of the invention is also to provide a kind of for the bottom ash treatment device of fluidized-bed gasification furnace and bottom ash treatment side
Method can rationally utilize the sensible heat of warm sludge, achieve the purpose that energy-saving.
In order to achieve the above objectives or the first purpose, technical solution of the invention are as follows:
A kind of bottom ash treatment device for fluidized-bed gasification furnace, the bottom ash treatment device have warm sludge entrance and cold slag
Outlet, the warm sludge entrance receive warm sludge for connecting with gasification furnace, and the cold slag outlet is for being discharged cold slag, the bottom ash
Processing unit is configured as firing warm sludge again and cooling treatment.
According to a preferred embodiment of the present invention, the bottom ash treatment device includes oxidant inlet, coolant entrance
It is exported with furnace gases are returned, the oxidant inlet is used for being passed through oxidant, the coolant entrance into bottom ash treatment device
In being passed through coolant into bottom ash treatment device, the furnace gases outlet of returning will be for that will return furnace gases return gasification furnace.
According to a preferred embodiment of the present invention, the position of oxidant inlet in the vertical direction is higher than coolant entrance
Position in the vertical direction, and return the position of furnace gases outlet in the vertical direction and be higher than oxidant inlet in vertical direction
On position.
According to a preferred embodiment of the present invention, the bottom ash treatment device further includes sealing gas entrance, for
Sealing gas is passed through in bottom ash treatment device, and the position of sealing gas entrance in the vertical direction exists lower than coolant entrance
Position on vertical direction.
According to a preferred embodiment of the present invention, the bottom ash treatment device includes vertical extended segment and positioned at prolonging vertically
The tilting section above section is stretched, the tilting section is tilted relative to the longitudinal axis of vertical extended segment to the side of vertical extended segment,
Wherein the tilting section connects with gasification furnace, and the lower end of vertical extended segment forms and do not hang down with the longitudinal axis of vertical extended segment
Straight inclined surface.
According to a preferred embodiment of the present invention, the oxidant inlet is arranged on tilting section, and the cooling
Agent entrance is arranged on vertical extended segment.
According to a preferred embodiment of the present invention, the bottom ash treatment device further includes gas collecting tube, and the gas collecting tube is set
It sets inside bottom ash treatment device, and be connected with furnace gases outlet is returned.
According to a preferred embodiment of the present invention, the generally cylindrical structure of bottom ash treatment device, and it is described
The center that bottom ash treatment device is arranged in gas collecting tube makes the central axis of gas collecting tube and the central axis of bottom ash treatment device same
Axis.
According to a preferred embodiment of the present invention, the bottom ash treatment device includes upper converging transition, lower converging transition and Jie
Cylinder section between upper converging transition and lower converging transition, and oxidant inlet, coolant entrance and sealing gas entrance are all provided with
It sets on cylinder section.
According to a preferred embodiment of the present invention, the bottom ash treatment device further includes flapper, and the flapper is set
It sets in the bottom of bottom ash treatment device.
According to another aspect of the present invention, a kind of bottom ash treatment method for fluidized-bed gasification furnace, institute are additionally provided
It states bottom ash treatment method and uses the bottom ash treatment device for fluidized-bed gasification furnace as described in any one of the preceding claims.
In the bottom ash treatment device and bottom ash treatment method for fluidized-bed gasification furnace of the invention, the warm sludge of gasification furnace
Bottom ash treatment (including fire and cool down again) device can be admitted to be reacted with oxidant, generate and be rich in CO2Or rich in CO and
The hot fume of H2 effectively reduces the phosphorus content in warm sludge；Meanwhile carbon occurs in bottom ash reduction reaction and coolant and heat
Direct heat exchange between slag, can effectively reduce warm sludge temperature；The bottom ash outlet pressure and bottom ash treatment that gasification furnace can be configured fill
The pressure set, effectively prevent that gasifying agent is carried into bottom ash treatment device or bottom ash is fired in unit again, avoids existing row
Slag mode is easy to the problems such as slagging and coal gas gas blowby, eliminates operational safety hidden danger, guarantees that fluidized-bed gasification furnace long period is steady
Fixed operation；Hot fume and steam after being overheated by warm sludge or cooling water are looped back return-air list by the steam that warm sludge heating generates
Member promotes the progress of gasification reaction, improves system cold gas efficiency；In addition, the temperature of warm sludge can be reduced to 100 DEG C hereinafter, can
To cancel the equipment such as lag cooler, and conveyor belt conveying warm sludge is directlyed adopt, investment reduction and operation expense.
Detailed description of the invention
Fig. 1 is the flow diagram of fluidized gasification system according to the present invention；
Fig. 2 is the structural schematic diagram according to the bottom ash treatment device for fluidized-bed gasification furnace of the embodiment of the present invention；
And
Fig. 3 is to be shown according to the structure of the bottom ash treatment device for fluidized-bed gasification furnace of another embodiment of the invention
It is intended to.
Specific embodiment
Detailed description of the present invention exemplary embodiment with reference to the accompanying drawing, wherein the same or similar label indicates phase
Same or similar element.In addition, in the following detailed description, to elaborate many concrete details to provide convenient for explaining
To the comprehensive understanding of present disclosure embodiment.It should be apparent, however, that one or more embodiments are not having the case where these details
Under can also be carried out.In other cases, well known construction and device is diagrammatically embodied to simplify attached drawing.
General plotting according to the present invention provides a kind of bottom ash treatment device for fluidized-bed gasification furnace, the bottom
There is Slag treatment device warm sludge entrance and cold slag to export, and the warm sludge entrance is described for being connect with gasification furnace to receive warm sludge
The outlet of cold slag is for being discharged cold slag, and the bottom ash treatment device is configured as firing warm sludge again and cooling treatment.
Fig. 1 is the general illustration of fluidized gasification system according to the present invention, as shown in Figure 1, fluidized gasification system
Including gasification furnace 1 and bottom ash treatment device 2.Gasification furnace 1 includes fuel inlet, gasification agent inlet, coal gas and flying dust outlet, warm sludge
Export and return furnace gases entrance, wherein fuel inlet for being passed through into gasification furnace 1 fuel A (such as coal), use by gasification agent inlet
In being passed through gasifying agent into gasification furnace 1, the coal gas and flying dust C that gasification furnace 1 generates go out from coal gas and flying dust outlet export, warm sludge
Mouth is used for the export of warm sludge D, returns furnace gases entrance for connecting with following furnace gases outlets of returning, receives and return furnace gases E.
Warm sludge entrance, the outlet of cold slag, oxidant inlet, coolant entrance, sealing gas are provided on bottom ash treatment device 2
Entrance is exported with furnace gases are returned.Wherein, warm sludge entrance is directly or indirectly connected to the outlet of the bottom ash of gasification furnace 1, to receive warm sludge
D；Cold slag outlet is for being discharged cold slag K；Oxidant inlet is for being passed through oxidant F, coolant entrance into bottom ash treatment device 2
For being passed through coolant G into bottom ash treatment device 2；Sealing gas entrance is for being passed through blanket gas into bottom ash treatment device 2
Body H；It returns furnace gases outlet to be directly or indirectly connected to the furnace gases entrance that returns of gasification furnace 1 (or gasification unit), for that will return
Furnace gases E returns to gasification furnace 1.
By setting oxidant inlet and coolant entrance, oxidant F and cooling can be passed through into bottom ash treatment device 2
Agent G, fires warm sludge D and cooling treatment again.The work of 1 pair of fluidized gasification system according to the present invention with reference to the accompanying drawing
Process is illustrated.Specifically, the course of work of fluidized gasification system includes the following steps:
A) fuel (by taking coal as an example) A and gasifying agent B is passed through gasification furnace 1 to gasify, generates coal gas and flying dust C and warm sludge
D；Coal gas and flying dust C leave system；The warm sludge D being discharged from 1 burner hearth bottom of gasification furnace enters bottom ash treatment device 2；
B) oxidant F and coolant G are passed through bottom ash treatment device 2, warm sludge D reacts with oxidant F, generates hot cigarette
Gas；Coolant G and warm sludge D carries out direct contact heat transfer, makes warm sludge temperature that defeated slag is reduced to allow temperature, forms cold slag K；
C) oxidant F reacts the hot fume generated with warm sludge D and the later coolant G that absorbs heat is returned as furnace gases E is returned
Gasification furnace 1；
D) the cold slag K generated leaves system.
Wherein, the warm sludge D in the step a) is dry ash extraction product, and temperature is in the range of 800 DEG C -1300 DEG C；Institute
State the combination that the oxidant F in step b) is air, oxygen-enriched air or pure oxygen or aforementioned thrin and water vapour；It can be with
By adjusting in oxidant F oxygen amount or quantity of steam make the maximum temperature of warm sludge D and oxidant F in the step b) than firing
Expect that the softening temperature of A is 150 DEG C low, to avoid fuel slagging, guarantees smooth dry ash extraction.For example, the oxygen for reducing oxidant F contains
Amount, the thermal discharge that warm sludge burning generates is few, and the reaction temperature of warm sludge D and oxidant F reduce, thus are not easy slagging.
It is possible to further the amount of feeding by adjusting oxidant F, make the hot fume in the step b) rich in CO2
Or it is rich in CO and H2Gas.Coolant G in the step b) is water or water vapour.
Sealing gas H can also be passed through into bottom ash treatment device 2 in the step b), is playing the same of sealing function
When, the temperature of warm sludge D is reduced to defeated slag to allow temperature by sealing gas H with coolant G collective effect；Meanwhile sealing gas H
Gasification furnace 1 is returned as furnace gases E is partially returned.The sealing gas H is CO2Or the inert gases such as nitrogen.Sealing gas H's
The amount of feeding is the function of warm sludge amount and bottom ash treatment apparatus structure size.
Preferably, in the step a), the bottom ash outlet pressure P of gasification furnace 10Less than in bottom ash treatment device 2
Pressure P1, to avoid gas leak.
Fig. 2 is the structural schematic diagram according to the bottom ash treatment device for fluidized-bed gasification furnace of the embodiment of the present invention,
As shown in Fig. 2, fuel inlet, gasification agent inlet and coal gas and flying dust outlet is arranged in gasification furnace 1.It should be noted that gasification furnace 1
It further include returning furnace gases entrance, returning furnace gases entrance can be set above the gasification agent inlet of gasification furnace 1, this is because by
Furnace gases E temperature is higher for the burning of bottom ash treatment device 2 and returning after heat exchange, can directly participate in the reaction in gasification furnace 1.
In Fig. 2, bottom ash treatment device 2 includes vertical extended segment and the tilting section above vertical extended segment, described
Tilting section is tilted relative to the longitudinal axis of vertical extended segment to the side of vertical extended segment, wherein the tilting section and gasification furnace
1 connects, and the lower end of vertical extended segment forms and enters with the inclined surface oxidant of the longitudinal axis out of plumb of vertical extended segment
Mouth is arranged on tilting section with furnace gases outlet is returned, and returns furnace gases and exports higher than oxidant inlet, and the coolant entrance
It is arranged on vertical extended segment.In this way, the position of oxidant inlet in the vertical direction is higher than coolant entrance perpendicular
The upward position of histogram, and return furnace gases outlet position in the vertical direction and be higher than oxidant inlet in the vertical direction
Position.In this way, warm sludge first catalytic oxidation agent in dropping process, then coolant is contacted, rather than on the contrary, it ensure that warm sludge exists
With oxidant reaction under higher temperature, be conducive to the progress of reaction.
Oxidant inlet and coolant entrance can respectively include multiple, it is preferable that multiple oxidant inlets are circumferentially square
To being evenly arranged, and multiple coolant entrances are evenly distributed in the circumferential direction.Preferably, oxidant inlet is configured to multiple rows of
Multiple oxidant inlets of arrangement, and in the oxidant inlet of the oxidant inlet and adjacent row in any row's oxidant inlet
Oxidant inlet be staggered, and coolant entrance is configured to the coolant entrance of arranged in rows, and any row is cold
But the coolant entrance in the coolant entrance of the coolant entrance in agent entrance and adjacent row is staggered.
In the embodiment of fig. 2, bottom ash treatment device 2 further includes flapper 22, and the flapper 22 is arranged at bottom ash
Manage the bottom of device 2.While flapper 22 is used to control deslagging, prevents gas from exporting from cold slag and escape, during the work time,
Flapper 22 can seal cold slag outlet, lock gas, avoid gas leakage.
Flapper 22 may be constructed such that valve, open valve in deslagging.Or alternatively, flapper 22 include into
Mouth, first chamber, second chamber, intermediate cavity and outlet, between first chamber and second chamber, entrance is set intermediate cavity
It sets in first chamber, outlet is arranged in second chamber, the first valve is arranged between first chamber and intermediate cavity, in
Between the second valve is set between chamber and second chamber.At work, the second valve can be closed, then open the first valve,
The bottom ash of slag outlet discharge cold in this way is directly entered intermediate cavity by entrance, first chamber, to the indoor bottom ash product of intermediate cavity
It is tired to close the first valve to a certain extent, then open the second valve, such bottom ash can enter second chamber and can from
The outlet of second chamber connection is discharged, and after the bottom ash for emptying intermediate cavity, turns off the second valve, then opens the first valve.
In this way it is possible to which coal gas is avoided to leak.
Fluidized gasification system according to this embodiment, fuel (by taking coal as an example) A and gasifying agent B are passed through the progress of gasification furnace 1
Gasification generates coal gas and flying dust C and warm sludge D；Coal gas and flying dust C leave system, the warm sludge D being discharged from 1 burner hearth bottom of gasification furnace
Into bottom ash treatment device 2, gasification reaction first occurs with oxidant F, generates and is rich in CO and H2Hot fume and low carbon content
Warm sludge, the warm sludge of low carbon content are cooled to 100 DEG C hereinafter, form cold slag K by coolant G again, at the same coolant F be heated (or
Overheat) at high-temperature steam.Hot fume and high-temperature steam are participated in as furnace gases E return gasification furnace 1 in the middle part of gasification furnace burner hearth is returned
Gasification reaction, cold slag K is by leaving system after the flapper 22 of bottom ash material apparatus 2.
Fig. 3 is the structural schematic diagram according to the bottom ash treatment device for fluidized-bed gasification furnace of the embodiment of the present invention,
As shown in figure 3, gasification furnace 1 is roughly the same with embodiment shown in Fig. 2.In the embodiment of Fig. 3, bottom ash treatment device 2 is in big
Cause it is columnar structured, including upper converging transition, lower converging transition and the cylinder section between upper converging transition and lower converging transition.At bottom ash
The cylinder section for managing device 2 has the equivalent diameter for being less than gasification furnace 1.Here, equivalent diameter refer to cylindrical body diameter or with it is non-
Therefore the diameter of the equal cylindrical body of the hydraulic radius of cylindrical body in the case where non-circular or non-cylinder, is mentioned straight herein
Diameter refers both to equivalent diameter.
Bottom ash treatment device 2 further includes sealing gas entrance, and oxidant inlet, coolant entrance and sealing gas enter
Mouth is arranged on cylinder section.Wherein, the position of oxidant inlet in the vertical direction is higher than coolant entrance in vertical direction
On position, the position of sealing gas entrance in the vertical direction be lower than the position of coolant entrance in the vertical direction, and
It returns the position of furnace gases outlet in the vertical direction and is higher than the position of oxidant inlet in the vertical direction.In this way, warm sludge is under
First catalytic oxidation agent during falling, then contact coolant, rather than on the contrary, it ensure that warm sludge at relatively high temperatures with oxidant
Reaction is conducive to the progress of reaction；It can guarantee that gas will not be revealed from lower part simultaneously.
The sealing gas entrance can be to be multiple, and multiple sealing gas enter the uniform cloth of circumferencial direction of opening's edge cylinder section
It sets.Alternatively, multiple sealing gas entrances can be not arranged on cylinder section, but the angled circumferential face of lower converging transition is arranged in
On, and multiple sealing gas enter the circumferencial direction of converging transition under opening's edge and are evenly arranged, with the central axis relative to cylinder section
Angled mode blows sealing gas, is conducive to seal.Sealing gas entrance also may be constructed such that continuously in the circumferential direction
Entrance ring, in favor of being uniformly blown into sealing gas.
The bottom ash treatment device 2 further includes gas collecting tube 21, and the gas collecting tube 21 is arranged inside bottom ash treatment device 2,
And it is connected with furnace gases outlet is returned, and the gas collecting tube 21 is arranged in the center of bottom ash treatment device 2 and makes gas collecting tube
The center vehicle of 21 central axis and bottom ash treatment device 2 is coaxial by line.
Gas collecting tube 21 may be constructed such that the form of comb or round tube group, such as gas collecting tube 21 is comb group, comb group
Including three combs, three combs intersect so that comb group edge and the cross section of longitudinal axis orthogonal are in " rice " font, Huo Zhepai
Pipe group includes two combs, and two combs intersect so that comb group edge and the cross section of longitudinal axis orthogonal are in " ten " font.It replaces
Dai Di, gas collecting tube 21 can be round tube group, and round tube group is closely combined by multiple round tubes and forms circle.
The bottom opening of gas collecting tube 21, and multiple through-holes can be set on the outer peripheral surface of gas collecting tube 21, so that gas
It can be entered inside gas collecting tube by bottom opening and through-hole, and be guided to and return furnace gases outlet.
Alternatively, returning furnace gases outlet can be set on upper converging transition, also be conducive to return the discharge of furnace gases E in this way.
Fluidized gasification device according to this embodiment, fuel (by taking coal as an example) A and gasifying agent B are passed through the progress of gasification furnace 1
Gasification generates coal gas and flying dust C and warm sludge D；Coal gas and flying dust C leave system, the warm sludge D being discharged from 1 burner hearth bottom of gasification furnace
Into bottom ash treatment device 2.In the lower situation of carbon content in the bottom ash, warm sludge D in bottom ash treatment device 2 and oxidant F into
Row combustion reaction generates and is rich in CO2Hot fume and low carbon content warm sludge, the warm sludge of low carbon content cools down by coolant G again
To 200 DEG C hereinafter, forming cold slag K, while coolant F is heated (or overheat) into high-temperature steam.Hot fume and high-temperature steam quilt
The gas collecting tube 21 being placed in bottom ash treatment device 2 is collected and is booted up, and is returned to gasification furnace 1 as furnace gases E is returned, is participated in gasification
Reaction, cold slag K enters pressurising lock hopper by Subzero valve, through lock hopper deslagging.
In the embodiment shown in fig. 3, it returns furnace gases E and is introduced into the gas collecting tube being placed in inside bottom ash treatment device, received
It is exported after collection and returns to gasification furnace.Return furnace gases can from gasification furnace burner hearth bottom or gasification furnace other positions (such as upper furnace,
Material returning device etc.) return to gasification furnace.
According to another aspect of the present invention, a kind of bottom ash treatment method for fluidized-bed gasification furnace, institute are additionally provided
It states bottom ash treatment method and uses the bottom ash treatment device for fluidized-bed gasification furnace as described in any one of the preceding claims.
Provided by the present invention for the bottom ash treatment device and bottom ash treatment method of fluidized-bed gasification furnace, compared to existing skill
Art has the advantages that
(1) it is fired again by bottom ash, reduces phosphorus content in bottom ash；It returns furnace gases and returns to gasification furnace participation gasification reaction, effectively
Raising system efficiency of carbon con version and cold gas efficiency；
(2) it makes full use of the sensible heat byproduct steam of bottom ash or makes steam superheating, improve system effectiveness；
(3) it makes full use of the sensible heat of bottom ash to preheat the gasifying agent for entering gasification furnace, improves system effectiveness；
(4) pressure of bottom ash treatment device is higher than gasification bottom slag outlet pressure, effectively prevent gasification furnace gasifying agent quilt
It is carried along into bottom ash treatment device, avoids the problems such as existing deslagging mode is easy to the gas blowby of slagging and coal gas, eliminates fortune
Row security risk guarantees fluidized-bed gasification furnace long-period stable operation；
(5) when the temperature of warm sludge is reduced to 100 DEG C or less, the equipment such as lag cooler, investment reduction and operation dimension can be cancelled
Protect cost；
(6) in pressure gasification process, using lock hopper deslagging after warm sludge is cooling, the material of lock hopper valve can be greatly reduced
Grade improves the reliability of system.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can be changed these embodiments without departing from the principles and spirit of the present invention.Applicable model of the invention
It encloses and is defined by the appended claims and the equivalents thereof.
Reference signs list:
1 gasification furnace
2 bottom ash treatment devices
21 gas collecting tubes
22 flappers
A fuel
B gasifying agent
C coal gas and flying dust
D warm sludge
E returns furnace gases
F oxidant
G coolant
H sealing gas
The cold slag of K.
Claims (11)
1. a kind of bottom ash treatment device (2) for fluidized-bed gasification furnace, the bottom ash treatment device (2) have warm sludge entrance and
Cold slag outlet, for the warm sludge entrance for being connect with gasification furnace (1) to receive warm sludge (D), the cold slag outlet is cold for being discharged
Slag (K), it is characterised in that: the bottom ash treatment device (2) is configured as firing warm sludge (D) again and cooling treatment.
2. the bottom ash treatment device (2) according to claim 1 for fluidized-bed gasification furnace, which is characterized in that the bottom
Slag treatment device (2) includes oxidant inlet, coolant entrance and returns furnace gases outlet, and the oxidant inlet is used for bottom ash
It is passed through oxidant (F) in processing unit (2), the coolant entrance is used to be passed through coolant into bottom ash treatment device (2)
(G), the furnace gases outlet of returning will be for that will return furnace gases (E) return gasification furnace (1).
3. the bottom ash treatment device (2) according to claim 2 for fluidized-bed gasification furnace, which is characterized in that oxidant
The position of entrance in the vertical direction is higher than the position of coolant entrance in the vertical direction, and returns furnace gases outlet vertical
Position on direction is higher than the position of oxidant inlet in the vertical direction.
4. the bottom ash treatment device (2) according to claim 2 for fluidized-bed gasification furnace, which is characterized in that the bottom
Slag treatment device (2) further includes sealing gas entrance, for being passed through sealing gas (H) into bottom ash treatment device (2), and it is close
It seals the position of gas access in the vertical direction and is lower than the position of coolant entrance in the vertical direction.
5. the bottom ash treatment device (2) according to claim 2 for fluidized-bed gasification furnace, which is characterized in that the bottom
Slag treatment device (2) includes vertical extended segment and the tilting section above vertical extended segment, and the tilting section is relative to vertical
The longitudinal axis of extended segment is tilted to the side of vertical extended segment, wherein the tilting section connects with gasification furnace (1), and vertical
The lower end of extended segment forms the inclined surface with the longitudinal axis out of plumb of vertical extended segment.
6. the bottom ash treatment device (2) according to claim 5 for fluidized-bed gasification furnace, which is characterized in that the oxygen
Agent entrance is arranged on tilting section, and the coolant entrance is arranged on vertical extended segment.
7. the bottom ash treatment device (2) according to claim 2 for fluidized-bed gasification furnace, which is characterized in that the bottom
Slag treatment device (2) further includes gas collecting tube (21), and gas collecting tube (21) setting is internal in bottom ash treatment device (2), and with
Furnace gases outlet is returned to be connected.
8. the bottom ash treatment device (2) according to claim 7 for fluidized-bed gasification furnace, which is characterized in that the bottom
Slag treatment device (2) generally cylindrical structure, and the gas collecting tube (21) setting makes at the center of bottom ash treatment device (2)
Obtain the central axis of gas collecting tube (21) and the central axis coaxial of bottom ash treatment device (2).
9. the bottom ash treatment device (2) according to claim 4 for fluidized-bed gasification furnace, which is characterized in that the bottom
Slag treatment device (2) includes upper converging transition, lower converging transition and the cylinder section between upper converging transition and lower converging transition, and oxygen
Agent entrance, coolant entrance and sealing gas entrance are arranged on cylinder section.
10. being used for the bottom ash treatment device (2) of fluidized-bed gasification furnace, feature according to any one of claim 2-9
It is, the bottom ash treatment device (2) further includes flapper (22), and the flapper (22) is arranged in bottom ash treatment device (2)
Bottom.
11. a kind of bottom ash treatment method for fluidized-bed gasification furnace, which is characterized in that the bottom ash treatment method is used as weighed
Benefit requires the bottom ash treatment device (2) that fluidized-bed gasification furnace is used for described in any one of 1-10.
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Cited By (1)
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| CN114250086A (en) * | 2021-12-21 | 2022-03-29 | 中国科学院工程热物理研究所 | Slag cooling method and device |
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