CN101665724A - Water-coal-slurry gasification method and gasification furnace - Google Patents
Water-coal-slurry gasification method and gasification furnace Download PDFInfo
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Abstract
The invention relates to a coal gasification method, which comprises that water-coal-slurry is introduced into a gasification chamber of a gasification furnace for gasification reaction. The method ensures that a flowing gaseous medium exchanges heat with the gasification chamber and the gaseous medium is positioned in a gas-cooling space isolated from the gasification chamber. The invention alsoprovides a gasification furnace for coal gasification, which comprises the gasification chamber positioned on the upper part of the gasification furnace and used for gasifying the water-coal-slurry, acooling chamber positioned on the lower part of the gasification furnace, and the gas-cooling space which is isolated from the gasification chamber, is used for the gaseous medium to flow therein, and exchanges heat with the gasification chamber. The water-coal-slurry gasification method and the gasification furnace disclosed by the invention do not use refractory bricks as a lining material of the gasification chamber, can effectively reduce the maintenance cost of the water-coal-slurry gasification furnace and improve the reliability and production time of the gasification furnace.
Description
Technical field
The vapourizing furnace that the present invention relates to a kind of coal gasification method and use this method.
Background technology
Coal is the topmost primary energy source of China, and its clean and effective utilizes most important for China.Coal gasification is as a kind of advanced person's cleaning coal utilization technology, it is the basis of technologies such as coal gasification power generation (mainly being IGCC), Coal Chemical Industry (comprising coal system oil, coal system alkene, coal system methyl alcohol, synthetic ammonia and urea, gasification hydrogen manufacturing etc.), Coal (syngas) polygeneration, be the great technology of energy field, be subjected to the attention of many countries.
Development through decades has formed four types Coal Gasification Technology: fixed bed gasification, fluidized-bed gasification, entrained flow gasification and molten bath gasification technology in the world.Entrained flow bed gasification technology has efficient height, big, simple relatively, the effective pneumatolytic branch (CO+H of gas composition of scale
2) the content advantages of higher, become the emphasis of research and development.Especially along with the development of novel Coal Chemical Industry industry in recent years, entrained flow bed gasification technology is applied rapidly.
Large-scale airflow bed gasification furnace mainly divides two kinds according to feed-type: coal slurry gasifier and dry coal dust gasification furnace.
Coal slurry gasifier typical case representative is Texaco gasifier (being the GE gasification technology), other large-scale air flow bed coal slurry gasifier also has the E-Gas vapourizing furnace of two-part, domestic East China University of Science has developed multi-nozzle opposed type coal slurry gasifier, Tsing-Hua University has developed the two-part coal slurry gasifier, and has dropped into industrial application.Texaco gasifier is made up of two portions up and down, and top is vaporizer, and there are two kinds of forms the bottom of vapourizing furnace because of type of cooling difference, and a kind of is the Quench type, and another kind is full recovery type heat.Vaporizer is formed by the multiple layer refractory brick, and outer wall is the round shape high pressure vessel, and its inwall (formation vaporizer) and outer wall are born high temperature resistant and high voltage bearing function respectively.Coal water slurry and oxygen enter the vaporizer gasification by vertical inlet (nozzle), and gasification back slag and synthetic gas enter the cooling zone.
A major defect of above-mentioned evaporating method is, wall lining is at high temperature worked for a long time, stand the high speed coal slurry and wash away, and wearing and tearing easily, its life-span is about 1 year, therefore needs periodic replacement refractory brick.For fear of the shut-down of changing during the refractory brick, producer gas plant can be prepared the standby vapourizing furnace of a cover usually, for using during aforementioned replacing refractory brick.This can increase a large amount of equipment inputs undoubtedly.Increased the production run cost.Refractory brick is difficult to stand 1400 ℃ high temperature, therefore requires the vapourizing furnace service temperature to be no more than 1400 ℃ usually, and the ash fusion point of coal for gasification is no more than 1350 ℃; In addition,, require in the coal CaO content lower, but the low coal ash fusion point of CaO content is higher because refractory brick is corroded by alkaline matter such as CaO easily.These factors have all limited coal adaptability.
The typical case of dry coal dust gasification furnace representative is shell (Shell) vapourizing furnace, also has the GSP vapourizing furnace of siemens in addition, and domestic Xi'an hot working research institute has developed the double-section dry coal powder pressurized-gasification furnace, and will be applied to green coal electricity Tianjin IGCC demonstration power station, Huaneng Group.
In the Shell coal gasification method, send into the gasification burner tip of two positioned opposite from the dry coal powder of pulverized coal preparation system by pressurized nitrogen, spray in the vapourizing furnace.Vapourizing furnace moves in 1400-1700 ℃ of scope.The vapourizing furnace working pressure is 2-4MPa.Ash content in vapourizing furnace in the coal is discharged with the slag form.Overwhelming majority slag leaves vapourizing furnace from furnace bottom, after cold slag bath cooling, enters slag lock system through dregs breaker again.The raw gas that goes out vapourizing furnace is being carried the slag particle secretly by circulation cooling coal gas institute Quench, slag is solidified and unlikely sticking on the synthetic gas cooling stave, and then remove from coal gas.Syngas cooler adopts the waterpipe type waste heat boiler, presses saturation steam or superheated vapour in being used for producing.
The Shell vapourizing furnace mainly is made of inner core and urceolus two portions.Inner core adopts water wall structure, only scribbles the thin refractory materials of one deck at side towards the fire, during normal running, relies on the molten slag layer protection water wall that hangs on the water wall.The space gas-bearing formation is arranged between inner core and the urceolus, and inner core only bears small pressure reduction, and vapourizing furnace can be distributed along centrosymmetry by 4～8 nozzles according to ability.
With the Shell method is that the dry method pressing gasization of representative has the gasification efficiency height, coal adaptability is wide, gasification operation temperature height, low, the thermo-efficiency advantages of higher of oxygen consumption, but following deficiency is arranged also: (1) is subjected to the influence of forced feed, and the highest vapor pressure does not have wet method vapor pressure height.Wet method gasification operation pressure is generally 2.8-6.5MPa, reaches as high as 8.5MPa, helps energy-conservation.The dry method gasification is owing to be subjected to the restriction of coal dust feed way, and vapor pressure is generally 3.0MPa.(2) the pulverized coal preparation investment is high, energy consumption is high, and there do not have coal water slurry to prepare environment to be good.The fine coal preparation requires relatively stricter to the raw material water content, need carry out drying, the energy expenditure height.Powdered preparation generally adopts pneumatic separation, and escaper need carry out scrubbing dust collection, otherwise easily brings environmental pollution, and the pulverized coal preparation system investment is increased.(3) the coal dust feed is difficult to stable control, and safety operation is not as the wet method gasification.The forced feed stability that is mainly reflected in fine coal can be brought detrimentally affect to safety operation not as the wet method charging.The wet method gasification is easy to pressurization, carries because fine coal is made coal water slurry.(4) the equipment complexity such as powder feeding, flying dust purification, waste heat boiler of pressurizeing in the technical process involve great expense.
Summary of the invention
The refractory brick life that the objective of the invention is to solve the coal water slurry gasification method is short, operation expense is high, the shortcoming of coal adaptability difference, also avoids the shortcoming of dry coal dust gasification furnace cost height, poor controllability.
Therefore the present invention provides a kind of method of gasification, comprise coal water slurry is incorporated in the vaporizer of vapourizing furnace to carry out gasification reaction, this method realizes heat exchange with vaporizer by the mobile gaseous medium, and gaseous medium is in the air cooling space that is isolated with vaporizer.
The gaseous medium that is used for the inventive method can be water vapour, nitrogen, air or carbonic acid gas.
In an embodiment of the inventive method, this air cooling spatial loop is around this vaporizer.
In another aspect of the present invention, a kind of vapourizing furnace that is used for gasification is provided, comprise vaporizer that is used for gasified coal water slurry that is positioned at vapourizing furnace top and the cooling room that is positioned at the vapourizing furnace bottom.But this vapourizing furnace also comprises the air cooling space that is isolated air feed attitude medium flowing with this vaporizer, and this air cooling space and this vaporizer carry out heat exchange.
In a kind of embodiment, this air cooling space is the interlayer between vapourizing furnace shell and vaporizer, and the interlayer between this interlayer and vaporizer is the air cooling wall.As preferably, this air cooling wall is formed by metallic substance.
In another kind of embodiment, this air cooling space is that the inner chamber by a coil pipe is limited, and this coil pipe is to be provided with around the inwall of this vapourizing furnace shell and corresponding to this vaporizer, so as to realize and vaporizer between heat exchange.More specifically, be in contact with one another between the thigh of this coil pipe and the thigh, form a successive air cooling wall in one side towards described vaporizer.As an alternative, can be separated from each other between the thigh of this coil pipe and the thigh, described air cooling wall is whole outside surfaces of described coil pipe.
In a kind of embodiment according to vapourizing furnace of the present invention, the import that is used to import coal water slurry is one, and is arranged on the top of described vaporizer.This import also can be for a plurality of, and they can evenly be arranged on the sidewall of described vaporizer.
The coal water slurry coal gasification method and the vapourizing furnace that adopt the present invention to disclose need not use refractory brick to make the vaporizer inner lining material, can effectively reduce the maintenance cost of coal slurry gasifier, but improve the reliability and the production time of vapourizing furnace.Adopt the coal water slurry feed, can effectively improve vapourizing furnace pressure, thereby reduce the vapourizing furnace volume, and higher pressure helps with the subsequent technique combination.In a preferred embodiment, owing to adopt the Quench scheme, water vapour content in the synthetic gas is higher, is particularly suitable for process for making hydrogen, thereby has advantage in technologies such as gasification hydrogen manufacturing, synthetic ammonia, methanol production, coal system oil, Coal (syngas) polygeneration and green coal electricity hydrogen power generation.
Description of drawings
Fig. 1 illustrates a representative embodiment according to vapourizing furnace of the present invention;
Fig. 2 illustrates another representative embodiment according to vapourizing furnace of the present invention;
Fig. 3 illustrates the relation between coal-water fluid concentration and the viscosity;
Fig. 4 is illustrated under the differing temps, the relation of coal-water fluid concentration and gasification efficiency;
Fig. 5 shows a cover throughput and reaches the diagram that 2000 tons/day gasification system is used for the hydrogen gas production flow process.
Embodiment
At the vapourizing furnace that is used for the coal water slurry gasification method of the present invention, independent air cooling space is provided, this air cooling space forms an air cooling wall that is exposed in the vaporizer, by gas flowing in this air cooling space, the heat exchange between the synthetic gas in air cooling wall and the vaporizer is carried out and is reached the purpose of cooling syngas.
In a kind of embodiment of the present invention, this air cooling space is an interlayer between vapourizing furnace shell and vaporizer, is used for interlayer and the isolated heat-conducting layer of opening of vaporizer are formed the air cooling wall.Steam (being preferably high pressure steam) is flowing in this annular air cooling space, with the synthetic gas in the cool gasification chamber.
In a kind of embodiment of the present invention, this air cooling wall is to be formed by spiralling coil pipe, this coil pipe can be to be coiled to form to be similar to helical spring mode by an open tube, also can be coiled to form side by side by many open tubes, be the air cooling space in the coil pipe, gaseous medium flows in it.Can be to join each other and form a successive air cooling wall between the sub-thread of spiral tube and the sub-thread, also can be to leave appropriate gap each other, and allow all surfaces of synthetic gas contact coil pipe.
In another kind of embodiment of the present invention, this air cooling wall is that the tube side-by-side " splicing " by many vertical uplift forms, and forms membrane type air cooling wall, and the gaseous medium that flows in the gas cold wall pipe is used for cooling.
Significantly, air cooling wall of the present invention can be not limited to aforesaid way, so long as can provide one can allow steam flow therein so that carry out heat exchange with vaporizer and can not stop the structure of medium flowing in the vaporizer, all can be used for the present invention.
The air cooling wall is a key character of the present invention, at first will guarantee the space of the vaporizer of its parcel, the needs that shape satisfies gasification reaction; Moreover also need to consider to keep the gasification operation temperature, to improve reaction efficiency and smooth deslagging, this heat that just requires heat-eliminating medium to take away can not be too many; Need in addition to guarantee that the air cooling wall temperature can not surpass the limit that material is stood, this requires heat-eliminating medium to take away more heat transfer again.Therefore, need select suitable operational condition (temperature, pressure parameter) according to coal characteristic during design air cooling wall, according to dynamics calculation and heat transfer check result, suitably select the material and the size of the kind of air cooling wall internal cooling medium and flow velocity, setting air cooling wall.When coal water slurry gasification, for guaranteeing gasification temperature, the heat that requires to take away can not be too many, often adopts saturation steam or wetting vapour as heat-eliminating medium.In operating process, then can regulate the parameters such as flow velocity of input speed, oxygen coal ratio, air cooling wall internal cooling medium, steady, the efficient operation of assurance device according to operational conditions and requirement.
In the present invention, can include but not limited to water vapour, nitrogen, air and carbonic acid gas as the gas of heat-eliminating medium.
In the present invention, heat-eliminating medium can be guided in the external system in the above-mentioned air cooling space, so that the recovery part waste heat.For example, the superheated vapour that generates in the air cooling wall can be used for driving the power-equipment in the factory, perhaps is used for generating, perhaps is used for the chemical reaction that needs consume middle and high pressure steam.
Because the present invention has introduced the air cooling wall at the vapourizing furnace that is used for the coal water slurry gasification method, not only can keep the temperature of vaporizer easily and reliably, make gasification reaction carry out safely and steadly, and save refractory materials has been set in vaporizer, thereby avoided the inconvenience of periodic replacement refractory materials, promoted the operation life of vapourizing furnace, sensible heat that in addition can partially recycled gasification reaction has improved capacity usage ratio.With respect to dry coal powder gasification, this vapourizing furnace has kept the advantage that the coal water slurry feed is reliable, vapor pressure is high, has avoided the shortcoming that dry coal powder feeder apparatus involves great expense, fluctuation of concentration is bigger.
Usually be made up of upper and lower two portions according to vapourizing furnace of the present invention, top is divided into vaporizer, and the bottom is a cooling room.Be provided with the air cooling space in top, it is provided for carrying out with vaporizer the air cooling wall of heat exchange.The type of cooling in cooling room both can be the Quench type, also can be full recovery type heat.In the Quench type type of cooling, slag directly contacts with water coolant in the shock chamber with synthetic gas and lowers the temperature, raw gas temperature Quench to 200～260 ℃, and slag is discharged by slag notch, and synthetic gas is discharged by syngas outlet.Obviously, raw gas can lose a part of physics sensible heat in the Quench process.In the full recovery type heat type of cooling, slag and the cooling zone of synthetic gas below vaporizer are by contacting with the thermal radiation water cooler, the temperature of raw gas is dropped to about 400 ℃, and the heat of recovery can be used for vapor wheel, thereby has improved the efficient of heating gas than Quench type.
As preferably, adopt the Quench type type of cooling in the present invention, though this mode is being hanged down aspect the heat utilization efficiency than full recovery type heat, possess following advantage: (1) number of devices reduces, and reliability improves, and investment reduces; (2) contain more water vapor after the Quench in the synthetic gas, help the subsequent conversion flow process, conversion process need not to add water vapour again; (3) Quench plays preliminary ash disposal, dust separating effect, and follow-up treating plant volume reduces.
The present invention can also adopt the two-part vaporizer.For example, the two-part feature of E-Gas vapourizing furnace can be incorporated into according in the vapourizing furnace of the present invention, the air cooling wall can be arranged at least one section vaporizer, preferably is arranged in first section vaporizer.Here, first section is meant one section that is transfused to major part (about 85～90% weight ratios) coal water slurry in the vaporizer, it typically is and be horizontally disposed with, second section is meant one section that is transfused to smaller portions (about 10～15% weight ratios) coal water slurry in the vaporizer, and it hangs down usually as for first section setting.The structure of E-Gas vapourizing furnace is known in the prior art, for example in " extensive Coal Gasification Technology " (Chemical Industry Press) book of Xu Shisen etc. the 178th page detailed disclosure is arranged.
Fig. 1 illustrates a representative embodiment according to vapourizing furnace of the present invention.Vapourizing furnace 10 comprises the shock chamber 120 of top vaporizer 110 and bottom, and shell 130 integrally seals vaporizer 110 and shock chamber 120.Vaporizer 110 is to be surrounded by spiral tube 116, and the wall of the vaporizer of Xing Chenging is the air cooling wall thus.The spiral tube inner chamber forms the air cooling space, flows therein to allow fluid medium.Process burner is arranged on top import 140 places of vapourizing furnace, is used for the coal water slurry and the oxygen of pressurization are sprayed into vaporizer 110.Vaporizer 110 enters shock chamber 120 by first outlet 112 of its lower end with synthetic gas and slag.Export 112 places in the shock chamber near vaporizer and be provided with the chilled water nozzle, this nozzle has two at least, and be symmetrically distributed in chilling ring 130 lower surfaces substantially, nozzle opening is directed downwards, and its position makes the chilled water that sprays into fully to contact with synthetic gas with the slag that enters the shock chamber.Discharged by second outlet 136 by the synthetic gas of Quench, cinder is then discharged by the 3rd outlet 138 of lower end.This single nozzle vapourizing furnace is suitable for the following vapourizing furnace of 1000 tons of/day scales; For the vapourizing furnace of gasification scale greater than 1000 tons/day, its technical and economic performance can be more excellent to adopt multi-jet layout (being generally 4 nozzles), multi-nozzle air cooling wall coal slurry gasifier as shown in Figure 2, the unique difference of itself and Fig. 1 is that four nozzles are arranged, four nozzles are along the vaporizer symmetric arrangement, nozzle axis is downward a little, becomes the angle a of 0-45 degree with horizontal plane.
Fig. 2 illustrates a modification embodiment illustrated in fig. 1, and its difference is that the import 140 of this vapourizing furnace is arranged on the top of the sidewall of vaporizer, and this import 140 is a plurality of.Import shown in Fig. 2 is 4, and it passes housing and air cooling wall in twos symmetrically respectively and is provided with.
Fuel such as coal form certain density coal water slurry (coal-water fluid concentration is generally between 60-80%) after treatment.Coal slurry is through being pumped into gasification burner tip, and that sends into simultaneously also has oxygen from air gas separation unit.The incomplete combustion reaction takes place in oxygen and coal slurry in vaporizer 110, produce hydrogen and carbon monoxide.Gasification temperature is between 1200-1600 ℃, and the slag of generation at high temperature melts and flows downstream into slag bath along air cooling wall 114, and the part heat is taken away by the saturated steam in the air cooling wall simultaneously.The high-temperature synthesis gas (about 1000 ℃ of temperature) that generates enters the shock chamber, the chilled water cooling that is sprayed.
Synthetic gas after the Quench is derived by syngas outlet 136, enters follow-up purification and technical process.Lime-ash falls into grey slag bath after by Quench.Operational condition
Main operational condition comprises coal-water fluid concentration (massfraction), gasification temperature, vapor pressure, carbon ratio
Coal-water fluid concentration
Coal-water fluid concentration affects the viscosity of coal water slurry with parameters such as the fineness of coal, coal dust, solid content, additive types.Relation between coal-water fluid concentration and the viscosity is seen Fig. 3.Coal particle size is littler, and coal-water fluid concentration is higher, and viscosity is bigger.The rheological property of considering coal slurry is to select the needs of carrying the coal slurry caliber for use.Caliber is too little, and loss of pressure head is big, opposite excessively can carry instability again, and sedimentation can take place solid.General coal water slurry viscosity is controlled at about 1PaS.
Fig. 4 is illustrated under the differing temps, the relation of coal-water fluid concentration and gasification efficiency.As seen under lower gasification temperature, increase coal-water fluid concentration, can improve gasification efficiency equally.General coal particle size is thinner, and coal-water fluid concentration is higher, and efficiency of carbon conversion or gasification efficiency are higher, but can cause that also viscosity of coal slurry increases severely, and to the reinforced difficulty of bringing of vapourizing furnace, therefore different coals all has the granularity and the concentration an of the best, and selection in advance need experimentize.
In order to improve gasification efficiency, guaranteeing to improve the concentration of coal slurry as far as possible under the mobile and stable condition of coal slurry.In general the slurry performance of coal slurry is in 60～80% scope.Gasification temperature and vapor pressure
Gasification temperature and pressure are very significant for the influence of gasification.In order to improve gasification temperature and gasification efficiency, shorten the reaction times, should adopt higher gasification temperature, and usually above the ash fusion point of coal, so that realize slag tap.But temperature can not be too high, otherwise, not only can shorten the life-span of vapourizing furnace air cooling wall, and need to consume more oxygen and coal, its economy can descend.Therefore, in the present invention, generally maintain between 1200～1600 ℃ for gasification temperature, higher 50～80 ℃ than the ash fusion point of coal usually.When ash fusion point is higher than 1500 ℃, will add fusing assistant, its ash fusion point is reduced to below 1500 ℃.
The throughput of vapourizing furnace is directly proportional with 1/2 power of pressure P.Rising pressure helps improving single stove throughput of vapourizing furnace, generally below 10MPa.The purposes of determining also to depend on product coal gas of vapor pressure height in the stove.For example being used for synthesizing methanol then is that 6～7MPa is suitable, and the operation of back does not need repressurize like this.In a specific embodiment of the present invention, produce the synthetic gas that is used for hydrogen manufacturing, vapor pressure is about 6.5MPa.
Carbon ratio
Carbon ratio is meant the ratio of oxygen consumption and carbon content in coal consumption in the gasification.It is relevant with character, coal-water fluid concentration, the coal slurry size-grade distribution of coal, and it is worth generally between 0.9～0.95.Obviously, carbon ratio is healed the oxygen consumption amount just more greatly, and this will influence economic target.
Application case
Fig. 5 shows a cover throughput and reaches the diagram that 2000 tons/day gasification system is used for the hydrogen gas production flow process.This vapourizing furnace working pressure 6.5MPa, 1370 ℃ of temperature; The vaporizer diameter is about 3,600mm, and the oxygen consumption is about 50,000Nm
3/ h, crude synthesis gas output is about 180,000Nm
3/ h, corresponding hydrogen output is about 150,000Nm
3/ h.
The dry coal powder gasification device of equal relatively scale adopts the investment of this novel gasification technology to reduce significantly, the device of estimating 2000 tons/day in a cover can reduce investment outlay 2～300,000,000 yuan (as shown in table 1).In addition, CO content is lower in this vapourizing furnace outlet gas composition, H
2And H
2O content is higher, and the water-gas shift unit scale in the follow-up process for making hydrogen can dwindle, and the quantity of steam of injection can reduce; Moreover the coal water slurry feed is convenient to control, moves more stable.
The investment advantage of the relative dry coal dust gasification furnace of table 1 the present invention (2000 tons of/day scales)
| Project | The present invention's investment | The dry coal powder gasification investment | Save investment |
| Be equipped with coal and defeated coal | 10,000 ten thousand | 14,000 ten thousand | 4,000 ten thousand |
| Vapourizing furnace | 20,000 ten thousand (chilling process) | 36,000 ten thousand (pot destroying process) | 16,000 ten thousand |
| Ash disposal | 4,000 ten thousand | 10,000 ten thousand | 6,000 ten thousand |
| Add up to | 34,000 ten thousand | 60,000 ten thousand | 26,000 ten thousand |
Compare with the existing coal slurry gasifier of refractory brick that adopts, can save the refractory brick maintenance cost of millions of units every year, growth working time of single stove, reliability increase, and the operation maintenance expense reduces, and economy is improved; In addition, can also produce the part superheated vapour, can be used for driving power-equipments such as air separation facility compressor, coal slurry pump.
In the present invention,, can effectively reduce the cost of coal slurry gasifier, improve the reliability and the available rate of vapourizing furnace owing to adopt the air cooling wall.Adopt the coal water slurry feed, can effectively improve vapourizing furnace pressure, thereby reduce the vapourizing furnace volume, reduce the vapourizing furnace cost, and higher pressure helps with the subsequent technique combination.In a preferred embodiment, owing to adopt the Quench scheme, water vapour content in the synthetic gas is higher, is particularly suitable for process for making hydrogen, thereby has advantage in technologies such as gasification hydrogen manufacturing, synthetic ammonia, methanol production, coal system oil, Coal (syngas) polygeneration and green coal electricity hydrogen power generation.
Claims (12)
1. the method for a coal water slurry gasification, comprise coal water slurry is incorporated in the vaporizer of vapourizing furnace to carry out gasification reaction, it is characterized in that, realize heat exchange with described vaporizer by the mobile gaseous medium, and described gaseous medium is in the air cooling space that is isolated with described vaporizer.
2. method according to claim 1, wherein, described gaseous medium is water vapour, nitrogen, air or carbonic acid gas.
3. method according to claim 1, wherein, described air cooling spatial loop is around described vaporizer.
4. method according to claim 1 wherein, adopts the synthetic gas and the slag that produce in the Quench method cool gasification chamber.
5. vapourizing furnace that is used for gasified coal water slurry, comprise the vaporizer that is used for gasified coal water slurry that is positioned at described vapourizing furnace top, with the cooling room that is positioned at described vapourizing furnace bottom, it is characterized in that, but also comprise the air cooling space that is isolated air feed attitude medium flowing with described vaporizer in the described vapourizing furnace, described air cooling space and described vaporizer carry out heat exchange.
6. vapourizing furnace according to claim 5, wherein, described air cooling space is the interlayer between described vapourizing furnace shell and described vaporizer, the interlayer between described interlayer and vaporizer is the air cooling wall.
7. vapourizing furnace according to claim 6, wherein, described air cooling wall is formed by metallic substance.
8. vapourizing furnace according to claim 5, wherein, described air cooling space is that the inner chamber by a coil pipe is limited, and described coil pipe is to be provided with around the inwall of described vapourizing furnace shell and corresponding to described vaporizer, so as to realize and described vaporizer between heat exchange.
9. vapourizing furnace according to claim 8 wherein, is in contact with one another between the thigh of described coil pipe and the thigh, forms a successive air cooling wall in the one side towards described vaporizer.
10. vapourizing furnace according to claim 8 wherein, is separated from each other between the thigh of described coil pipe and the thigh, and described air cooling wall is whole outside surfaces of described coil pipe.
11. vapourizing furnace according to claim 5, wherein, the import that is used to import coal water slurry is one, and is arranged on the top of described vaporizer.
12. vapourizing furnace according to claim 8, wherein, the import that is used to import coal water slurry is a plurality of, and evenly is arranged on the sidewall of described vaporizer.
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| JP2013028803A (en) * | 2011-06-30 | 2013-02-07 | General Electric Co <Ge> | System and method for cooling gasification reaction furnace |
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