CN102146301A

CN102146301A - Method for two-stage coal gasification on composite external heat fixed bed and gas furnace

Info

Publication number: CN102146301A
Application number: CN2011100381442A
Authority: CN
Inventors: 王子国
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-02-15
Filing date: 2011-02-15
Publication date: 2011-08-10

Abstract

The invention discloses a method for two-stage coal gasification on a composite externally heated fixed bed and a gas furnace. In the method, by using more than two kinds of external heat for the dry distillation of raw material coal in a dry distillation stage of a two-stage gas furnace, the coal gas in a gasification stage and the coal gas in the dry distillation stage can be utilized efficiently by adopting different simple purification measures respectively, gas generation is performed by a continuous gas generation method and a circulating gas generation method, chemical synthetic raw material gases meeting different component requirements can be produced by using different oxidizers and gasifying agents, and at the same time, tar with high economic value is extract from a raw material soft coal. The method and the gas furnace have the advantages of small investment, simple operation, environmental friendliness, high comprehensive coal gasification efficiency and low gas generation cost, and are suitable for constructing or reconstructing fixed bed gas generation furnaces which operates widely at present.

Description

A kind of method and gas furnace of compound outer thermosetting fixed bed two stage type gasization

Technical field

The invention belongs to gasification and produce chemical industry synthetic raw gas field, be specifically related to a kind of method and gas furnace of compound outer thermosetting fixed bed two stage type gasization.

Background technology

At present in China's synthetic ammonia, the methanol production, with coke, hard coal or anthracite briquette be raw material fixed bed intermittently gas furnace occupy quite great proportion, because this stove is a primary reformer, so it can not directly use the bituminous coal of high-volatile to be raw material, otherwise can produce the high and comparatively serious problems such as tar-acids water pollution of feed gas methane.Because anthracitic price is more and more higher, this producer that produces synthetic ammonia, methyl alcohol also for fixed bed gas furnace at intermittence brings very big cost pressure, presses for and adopts suitable non-smokeless coal gasification technology to reduce cost.

To non-hard coal system synthetic raw gas technology, be divided into three kinds of methods by the kinestate of coal: fluidized bed coal gasification method, air-flow bed coal-gasification method, fixed bed (moving-bed) coal gasification method.

Representational in the fluidized bed coal gasification method is that grace stove, ash melt poly-stove etc.Fluidized bed coal gasification method be because its service temperature can not surpass the grey melting point of feed coal, so carbonic acid gas and methane are higher in its unstripped gas that makes, effective pneumatolytic part is lower, and this method can not be extracted the higher tar light oil of economic worth in the feed coal.

Representational in the air-flow bed coal-gasification method is Texaco coal water slurry stove, Shell powder coal gasification furnace, GSP powder coal gasification furnace, HTL powder coal gasification furnace etc.The air-flow bed coal-gasification method is because its service temperature height, so the effective pneumatolytic part of its unstripped gas that makes is high, but this method construction period is long, the big operation of investment financial expense height, nozzle high temperature ablation serious wear, start-stop car and maintenance cost height, and this method can not be extracted the higher tar light oil of economic worth in the feed coal.

Fluidized bed coal gasification method and air-flow bed coal-gasification method also have a common deficiency to be: the gas temperature that makes is more than 1000 ℃, and the gas heat of high-temperature can only adopt the form that produces steam to be reclaimed like this, has reduced system air cooling coal gas efficient.Air-flow bed coal-gasification is because temperature of reaction is higher, though high temperature is beneficial to gasification reaction, effectively pneumatolytic divides, and the gas heat waste is more serious.For example the service temperature of Texaco coal water slurry stove, Shell powder coal gasification furnace, GSP powder coal gasification furnace, HT-L powder coal gasification furnace is all more than 1300 ℃, even up to more than 1600 ℃, generally can only adopt Quench and waste heat boiler to reclaim the heat flow process to a few family of such pyritous gas heat air-flow bed coal-gasification method, reduce cold gas efficiency.To this, the technology unit that has adopts two-part air-flow bed coal-gasification method to reclaim the coal gas of high temperature sensible heat, for example coal-based two segments combined gasifying process of Chinese patent (patent No. ZL00111437.9) and device thereof, Chinese patent (patent No. ZL01131780.9) double-section dry coal powder gasifying furnace, but the gas temperature after two sections still reaches about 1000 ℃, the gas temperature that gets with the fluidized bed coal vaporizing system is suitable, and the utilization of gas heat does not still have static bed coal gasification good.In addition, what air-flow bed coal-gasification adopted is furnace wall dross and fusion deslagging, and this raw material coal ash melting point that just requires to gasify can not be too high, and slag viscosity can not be excessive, otherwise need to add the material that reduces grey melting point in the feed coal, and this also can reduce cold gas efficiency.

It is Lurgi (Shandong is strange) pressurized-gasification furnace, BGL stove, two stage type gas stove etc. that non-hard coal adopts representational in the static bed coal gasification method.

Lurgi (Shandong is strange) pressurized-gasification furnace is to operate under 2.0～3.0MPa pressure, with the small coal is raw material, steam and oxygen continuous blast, the gasification bed divides drying, destructive distillation, reduction, oxidation and ash bed from top to bottom, product coal gas is through recovery of heat and oil removing, contain have an appointment 8%～12% methane and unsaturated hydrocarbons, the suitable town gas of doing.Raw gas can be made synthetic gas after hydro carbons separation and steam reforming.The maximum user of Lurgi stove is town gas and synthetic hydrocarbon (synthetic oil), also has the large size city gas fitting in China.Do not have the device of large-scale Lurgi stove per unit area yield synthetic ammonia abroad, major cause is except that the environmental protection problem, and technical process is long, will increase the subzero fractionation methane and the hydrocarbon conversion especially.China is once with brown coal system ammonia. and adopt first-generation φ 2800 lurgi gasifiers, produce normal. but environmental issue is more.φ 3800 lurgi gasifiers are introduced in the back, produce synthetic ammonia with meager coal, wash the high methane gas of separating by nitrogen in the explained hereafter flow process and return after one section steam reforming and CO conversion and take off CO ₂Main flow, flow process complexity, energy consumption height.

BGL stove (gasification of fixed bed slag tap) working pressure 2.5～3.0MPa, gasification temperature has surpassed the lime-ash yield temperature at 1400～1600 ℃, and the lime-ash form that is in a liquid state is discharged.Furnace structure is simpler than traditional Lurgi stove. cancelled the rotation fire grate.Because high-temperature operation, steam decomposition rate is higher, and steam consumption significantly reduces, gasification intensity improves 3 to 4 times than dry ash Lurgi stove, and caloric power of gas improves 1/4th approximately, but still has a great deal of methane and other hydro carbons in the coal gas, suit to make fuel gas, should not make the chemical industry synthetic raw gas.

The common drawback of Lurgi stove and BGL stove is: one, destructive distillation and gasification are carried out in primary reformer, though dryer section retort section feed coal can reclaim the gasification section gas heat that gasification section produces, but owing to be that direct gas-solid heat transmission is reclaimed, so being rich in the destructive distillation gas mixing of tar, undecomposed steam of gasification section and the dried distilled of retort section can produce more phenol water, the phenol shipwreck is to handle, so that bring serious environmental issue.Two, the coal gas that makes of Lurgi stove and BGL stove is the mixture of destructive distillation gas and gasification section coal gas, owing to contain very high methane in the destructive distillation gas, such caloric power of gas is higher, the gas that only is suitable for acting as a fuel uses, if use as unstripped gass such as making synthetic ammonia methyl alcohol, methane separation must be come out, and the separation of methane is comparatively difficult, separating energy consumption is big.If can not separation of methane before entering synthetic tower, can cause a large amount of synthetic generation of dropping a hint, cause ton ammonia or ton methyl alcohol power consumption and material ton all very big.

Nowadays the fixed bed two stage type gas stove that puts into operation has two kinds: a kind of is to make two sections stoves of gas continuously, and a kind of is two sections stoves of Cyclic Gas-making.

It is that oxygenant and vaporized chemical are made gas continuously with air and steam that fixed bed is made two sections stoves of gas continuously, because its epimere gas and hypomere gas all is mixed with a large amount of nitrogen and epimere gas is mixed with a large amount of methane, so this stove is mainly to produce propellant combination gas, for various Industrial Stoves provide source of the gas, be applied in industries such as iron and steel, machinery, building materials, glass, aluminum oxide widely.

Two sections stoves of early stage fixed bed Cyclic Gas-making, mainly for production city coal gas, because the relative heating value of natural gas of town gas is low and contain more virose carbon monoxide, the development of Sweet natural gas in addition, two sections stove production cities of Cyclic Gas-making coal gas is on the verge of being replaced, will progressively withdraw from the gas arena of history.

To produce two sections stoves of fixed bed Cyclic Gas-making of synthetic raw gas, Chinese patent has been announced two kinds of processing methodes, is respectively: two sections stoves of Chinese patent (patent No. ZL85100151) divide technology and the device and Chinese patent (patent No. ZL86105803) technology for production of raw-material gas for synthetic ammonia by coal gasification in two stage oven of gas coproduction town gas and water-gas.The common drawback of two patents is:

1, under the stage of blowing can not provide the destructive distillation heat to the retort section feed coal, be intermittently destructive distillation, cause the low feed coal destructive distillation of dry distillation efficiency incomplete, and then cause that methane content does in the gasification section coal gas, be not suitable for using as synthetic raw gas.

2, the town gas of Chan Shenging and the power gas calorific value is low, composition is complicated can only use as low-grade fuel, and purposes is very limited, and further purifying treatment is used as synthetic raw gas.

3, when adopting hypomere water-gas as thermophore direct heating destructive distillation epimere feed coal (interior hot destructive distillation), the destructive distillation gas that a large amount of undecomposed steam (the fixed bed gasification steam decomposition rate is about 40～60%) and epimere produce in the hypomere water-gas mixes can produce a large amount of phenol water, the phenol shipwreck easily causes serious environmental issue to handle.

In view of above reason, two sections furnaceman's process of these two kinds of fixed bed Cyclic Gas-making all do not obtain a large amount of industrial application.

Summary of the invention

In order to overcome the shortcoming that above-mentioned technology exists, the object of the present invention is to provide a kind of method and gas furnace of compound outer thermosetting fixed bed two stage type gasization.

One of purpose of the present invention is to provide a kind of method of compound outer thermosetting fixed bed two stage type gasization, it is characterized in that:

The non-hard coal of system gas raw material enters the static bed coal gasification retort section by the control of lock gas coal feeder, become semicoke at the retort section feed coal by outer hot destructive distillation, destructive distillation is warm eventually below 900 ℃, red-hot semicoke enters gasification section then, carry out continuous gasification or cycle gasification at gasification section inner oxidizing agent and vaporized chemical and semicoke, the coal gas that the gasification section gasification produces is through gasification section coal gas dust removal device, waste heat boiler, the cooling washing tower is sent into gasification section coal gas gas holder, and the coal gas that retort section produces is through retort section coal gas dust removal device, electro detarrer, water cooler, electricity removes the light oil device, send into retort section coal gas gas holder behind the induced draft fan;

Described non-hard coal is the lump coal of the non-caking coal in the bituminous coal, weakly caking coal, long-flame coal and brown coal or the moulded coal of its making.

Described outer hot pyrogenous thermal barrier is any or multiple of gaseous heat-carrier, liquid thermophore, solid thermal carriers;

The combustion high temperature flue gas that described outer hot pyrogenous gaseous heat-carrier is gasification section coal gas and combustiblesubstance; Described combustiblesubstance is inflammable gas, flammable liquid, flammable solid; Described inflammable gas is a retort section coal gas; When retort section heat that the sensible heat of gasification section coal gas is not enough to provide required, adopt the combustion high temperature flue gas additional heat of combustiblesubstance.

Described gasification section is made gas continuously, is to be oxygenant with the oxygen-rich air, is that vaporized chemical makes the unstripped gas that meets Ammonia Production by gasification section continuously with steam; Or be oxygenant with oxygen, be that vaporized chemical makes by gasification section continuously can be for the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen with steam; Or be oxygenant with oxygen, be that vaporized chemical makes the unstripped gas that is rich in carbon monoxide by gasification section continuously with the carbonic acid gas.The unstripped gas that is rich in carbon monoxide can be used for producing Chemicals such as acetic acid, formic acid, sodium formiate.

Described gasification section Cyclic Gas-making is can be for the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen with any alternately the making by gasification section as vaporized chemical as oxygenant and steam of air, oxygen-rich air, oxygen; Or with air, oxygen-rich air, oxygen is any alternately makes the unstripped gas that is rich in carbon monoxide by gasification section as oxygenant and carbonic acid gas as vaporized chemical.

The present invention also aims to provide a kind of compound outer thermosetting fixed bed two stage type gas stove, comprise lock gas coal supply apparatus, retort section body of heater, gasification section body of heater, grate, furnace bottom ash handling equipment, it is characterized in that:

Lock gas coal supply apparatus links to each other with the retort section body of heater, and the retort section body of heater links to each other with the gasification section body of heater, and the gasification section body of heater links to each other with furnace bottom ash handling equipment and grate, connects the furnace bottom gas interface in the middle of the furnace bottom, and gasification section body of heater top connects retort section coal gas interface; There is a pipe core at the center of retort section body of heater inner chamber, and there is side branch the upper end of pipe core, and each side branch gathers by the ring gas passage and connects the gasification section gas exit; The retort section sidewall of the furnace body is provided with refractory brick marshalling, several blast tubes of circumference uniform distribution are pressed in the centre of retort section sidewall of the furnace body middle and lower part refractory brick marshalling, the bottom inlet of each blast tube connects gas burner, be provided with point for measuring temperature in each blast tube, the top of several blast tubes is gathered by annular exhaust steam passage and is connected the combustion exhaust outlet.

Combustion gases discord gasification section and retort section in the blast tube are communicated with, and only by the form of indirect heat exchange the retort section feed coal are provided by providing of heat.

Details are as follows for technical scheme principle of the present invention:

The middle low-temperature cracking process and the type of coal are a lot, by type of heating external-heat destructive distillation (also claiming indirect destructive distillation) are arranged, internal heat type destructive distillation (also claiming direct destructive distillation) and the box-like destructive distillation of inside and outside thermojunction.Provide dry distillation of coal heat heating agent, also claim thermophore.Dry distillation of coal thermophore has gaseous heat-carrier, liquid thermophore, solid thermal carriers.

It is fast that rate of heating is compared in internal heat type destructive distillation and external-heat destructive distillation, homogeneous heating, heat-transfer effect is good, the thermo-efficiency height, thereby unit volume throughput is big, but at the fixed bed two stage type gasization, internal heat type destructive distillation main drawback is serious, promptly gasification section coal gas mixed diluting retort section coal gas, the gasification section coal gas that also can be described as retort section coal gas mixed diluting, cause the separation of mix products and utilize difficulty, also be easy to generate a large amount of phenol environmental pollution by water.The external-heat destructive distillation is compared with the internal heat type destructive distillation and is conducted heat slowly, throughput is little, but at the fixed bed two stage type gasization, its advantage of external-heat destructive distillation also is conspicuous, its advantage is that hypomere coal gas (gasification section coal gas) and gas in upper segment (retort section coal gas) are not mixed substantially, can handle hypomere coal gas and gas in upper segment respectively like this, be used respectively.In order to solve the internal heat type destructive distillation uneven problem of conducting heat slowly of conducting heat, the method of a kind of compound outer thermosetting fixed bed two stage type gasization of the present invention, retort section at gas furnace adopts compound external-heat method for destructive distillation, promptly adopt hypomere coal gas and at least a outer hot destructive distillation thermophore that the way of destructive distillation heat is provided, the combustion high temperature flue gas that preferred outer hot destructive distillation thermophore is a combustiblesubstance, the combustion high temperature flue gas of further preferred combustiblesubstance is the retort section gas-fired high-temperature flue gas after purifying.Because the retort section to the two stage type gas stove adopts outer hot destructive distillation, so the coal gas minute quantity of the coal gas of gasification section and retort section is mixed, so two strands of gases can adopt different control techniquess to be used respectively, and it is sternly living can not occur a large amount of phenol water in the epimere dry distillation gas process of cooling.

The present invention a kind of compound outside in the method for thermosetting fixed bed two stage type gasization, semicoke after low temperature in the process (destructive distillation is warm eventually below 900 ℃) the indirect heat exchange destructive distillation enters gasification section by retort section, semicoke is at the gasification reaction of gasification section, can adopt the method for continuous system gas and Cyclic Gas-making to carry out, chemical industry synthetic raw gas at different components requires can adopt different oxygenants and vaporized chemical.Details are as follows for concrete gasification process:

When adopting continuously system gas:

When being oxygenant with the oxygen-rich air, with steam is that vaporized chemical makes the unstripped gas that meets Ammonia Production by gasification section continuously, wherein being that oxygenant can make hypomere gas produce some nitrogen and carbonic acid gas with the oxygen-rich air, is that vaporized chemical hypomere coal gas contains higher H with steam ₂With the effective pneumatolytic part of CO, the nitrogen content of control oxygen-rich air makes the (H in the hypomere gas ₂+ CO)/N ₂≈ 3, and gaseous fraction meets the needs of producing synthetic ammonia.

When being oxygenant, be that vaporized chemical makes the unstripped gas that can supply to produce synthetic ammonia, methyl alcohol, methane, hydrogen by gasification section continuously with steam with oxygen.This kind method hypomere coal gas contains higher H ₂With the effective pneumatolytic part of CO, nonnitrogenous gas,, can adapt to the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen by the Purge gas method of conversion and decarburization.When producing synthetic ammonia, in order to satisfy (H ₂+ CO)/N ₂≈ 3 produces synthetic requirement, need replenish N in follow-up workshop section ₂When producing methyl alcohol, control (H ₂-CO ₂)/(CO+CO ₂) ≈ 2.1, finish the adjustment of gas ratio by part conversion and decarbonization process.

When being oxygenant, be that vaporized chemical makes the unstripped gas that is rich in carbon monoxide by gasification section continuously with the carbonic acid gas with oxygen.This kind method hypomere coal gas contains the effective pneumatolytic part of higher CO, can be used for producing Chemicals such as acetic acid, formic acid, sodium formiate.

When making gas continuously, gasification section coal gas leaves after the gasification section and retort section feed coal indirect heat exchange, provides the destructive distillation heat to it, and not enough heat adopts external thermal barrier indirect heat exchange to replenish and offers the retort section feed coal.

When adopting Cyclic Gas-making:

Cyclic Gas-making is meant with air, oxygen-rich air, oxygen is any alternately makes the unstripped gas that can supply to produce synthetic ammonia, methyl alcohol, methane, hydrogen by gasification section as oxygenant and steam as vaporized chemical.Or can be for the unstripped gas of producing rich carbon monoxide such as acetic acid, sodium formiate with any alternately the making as vaporized chemical of air, oxygen-rich air, oxygen by gasification section as oxygenant and carbonic acid gas.

Its system gas stage order of different Chemicals is also different according to producing.Owing to need to contain a certain amount of nitrogen in the unstripped gas of production synthetic ammonia, it is different with the unstripped gas system gas order of producing synthetic ammonia to produce the unstripped gas of methyl alcohol, methane, hydrogen.Narration respectively below:

Can be when producing the unstripped gas of synthetic ammonia with any alternately the making as vaporized chemical of air, oxygen-rich air, oxygen by gasification section as oxygenant and steam, the system gas stage be divided into successively in order blowing, recovery, on blow, blow down, blow, blow off six stages on the secondary.

The blowing stage is meant with air, oxygen-rich air, any semicoke exothermal reaction process as oxygenant and gasification section of oxygen, its reaction gas is sent into the blowing air emission-control equipment, and the three wastes co-combustion stove that the blowing air emission-control equipment can adopt the inventor's Chinese patent (patent No. ZL200810006652.0) static bed gas making furnace to produce in the device and method of synthetic gas energy-saving and emission-reduction is handled.

Recovery stage is meant that the blowing stage is afterwards with air, any semicoke exothermal reaction process as oxygenant and gasification section of oxygen-rich air, its reaction gas is sent into gasification section unstripped gas gas holder, and the purpose of recovery stage is in order to satisfy the requirement of syngas for synthetic ammonia nitrogen content.With the semicoke exothermal reaction process of oxygen as oxygenant and gasification section, because there is not nitrogen recyclable, so there is not recovery stage, the nitrogen in the syngas for synthetic ammonia will directly replenish the nitrogen that making oxygen by air separation produces in the back operation.

On blow be meant with steam as vaporized chemical the semicoke thermo-negative reaction process by gasification section from bottom to top, its reaction gas is delivered to gasification section unstripped gas gas holder.

Blow down be meant after the stage of blowing with steam as vaporized chemical the semicoke thermo-negative reaction process by gasification section from top to bottom.Its reaction gas is delivered to the unstripped gas gas holder.The purpose of blowing is stable for concentrating of gasification section high-temperature zone down, blows the too much sensible heat of gasification section coal gas on reducing simultaneously and takes out of, has improved cold gas efficiency.

Blow the same blowing on the secondary, be meant down after the stage of blowing with steam that as vaporized chemical from bottom to top by the semicoke thermo-negative reaction process of gasification section, its reaction gas is delivered to the unstripped gas gas holder.The purpose of blowing on the secondary is to prepare for safety blows off, and this stage is that displacement does not thoroughly easily cause exploding at the bottom of coal gas and the oxygenant mixture generator with steam displacement furnace bottom space.

The stage of blowing off is meant that its reaction gas is sent into gasification section unstripped gas gas holder with air, oxygen-rich air, any semicoke exothermal reaction process as oxygenant and gasification section of oxygen.The purpose that blows off is to be used for replacing reclaiming blowing over journey on the secondary and accumulating in coal gas in the system.

The next stage begins recirculation from the blowing stage again.

Can be when producing the unstripped gas of methyl alcohol, methane, hydrogen with any alternately the making as vaporized chemical of air, oxygen-rich air, oxygen by gasification section as oxygenant and steam, the system gas stage is divided into blowing, once blows off, on blow, blow down, blow on the secondary, secondary blows off six stages.

The blowing stage is meant that its reaction gas is sent into the blowing air emission-control equipment with air, oxygen-rich air, any semicoke exothermal reaction process as oxygenant and gasification section of oxygen.

Once blow off be meant blowing back with steam as vaporized chemical from bottom to top by the semicoke thermo-negative reaction process of gasification section, its objective is that the displacement blowing stage accumulates in the blowing air of system.When with air, oxygen-rich air being the unstripped gas of oxygenant blowing accumulation of heat production methyl alcohol, methane, hydrogen,, send into the blowing air emission-control equipment so once blow off reaction gas because of its reaction gas contains higher inert nitrogen.When with oxygen being the unstripped gas of oxygenant blowing accumulation of heat production methyl alcohol, methane, hydrogen, because of its reaction gas does not contain inert nitrogen, so there is not the stage that once blows off.

Blow the same blowing on the secondary, be meant down after the stage of blowing with steam that as vaporized chemical from bottom to top by the semicoke thermo-negative reaction process of gasification section, its reaction gas is delivered to the unstripped gas gas holder.The purpose of blowing on the secondary is to carry out secondary for safety to blow off and prepare, and this stage is with steam displacement furnace bottom space, and displacement does not thoroughly easily cause blast at the bottom of coal gas and the oxygenant mixture generator.

Secondary blows off the stage and is meant that its reaction gas is sent into gasification section unstripped gas gas holder with air, oxygen-rich air, any semicoke exothermal reaction process as oxygenant and gasification section of oxygen.The purpose that secondary blows off the stage is the gasification gas that the stage of blowing accumulates in system on the displacement recovery secondary.

Next stage fork begins recirculation from the blowing stage.

Can be when producing the unstripped gas of rich carbon monoxide such as acetic acid, sodium formiate with any alternately the making as vaporized chemical of air, oxygen-rich air, oxygen by gasification section as oxygenant and carbonic acid gas, its Cyclic Gas-making stage is vaporized chemical with steam with what introduce above, system the gas stage also is divided into blowing, once blows off, on blow, blow down, blow on the secondary, secondary blows off.Principle no longer describes in detail.

No matter gasification section adopts the system gas or the method for Cyclic Gas-making continuously, its up gasification section coal gas all indirect heat exchange is given the retort section feed coal.Gasification section coal gas process gasification section fly-ash separator dedusting after the heat exchange, and then, send into gasification section coal gas gas holder after washing is lowered the temperature through scrubber tower again through vapor superheater, waste heat boiler recovery sensible heat.Because gasification section is the gasification reaction that the semicoke after vaporized chemical and the destructive distillation carries out, so it is extremely low that gasification section coal gas does not contain tar and methane content substantially, gasification section coal gas composition and hard coal fixed bed interrupter method producer gas generator coal gas basically identical can directly use as the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen.

The retort section feed coal produces dry distillation gas through after the indirect destructive distillation, retort section coal gas captures tar through electro detarrer then through the dedusting of retort section fly-ash separator, cools off through supercooler again, go electricity to remove the light oil device then and capture light oil, send into retort section coal gas gas holder through induced draft fan.Retort section coal gas is owing to nonnitrogenous substantially gas, and main component is methane and hydrogen, so its calorific value is very high, uses through can be used as the city substitute natural gas after further purifying.Retort section coal gas is because the calorific value height also can use the high high heating value gas turbine power generation of generating efficiency.In addition, retort section coal gas also can produce H through the steam reforming reaction of methane ₂With the effective pneumatolytic part of CO, can be used as the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen and use, the total system cold gas efficiency also is improved like this.

A kind of compound outer thermosetting fixed bed two stage type gas stove provided by the invention, its know-why is: feed coal enters the retort section body of heater through lock gas coal supply apparatus, and destructive distillation becomes semicoke indirectly in the retort section body of heater, and dry distillation gas is discharged through retort section coal gas interface.Semicoke after the destructive distillation falls into and carries out gasification in the gasification section body of heater, and gasification is finished the lime-ash of generation and discharged gas furnace by grate break and furnace bottom ash handling equipment.No matter gasification section adopts the system gas or the method for Cyclic Gas-making continuously, its up gasification section coal gas all passes through the pipe core indirect heat exchange at retort section body of heater center and gives the retort section feed coal, reclaimed the sensible heat of gasification section coal gas, up gasification section coal gas is discharged by the gasification section gas exit at last.Fuel gas is through behind the gas burner of retort section, and the high-temperature flue gas of generation carries out the providing of heat by the form of indirect heat exchange to the retort section feed coal through the refractory brick marshalling blast tube.Like this feed coal retort section through two kinds outside indirectly destructive distillation of heat, the destructive distillation uniform and complete.

In sum, the present invention has reduced investment, gasification efficient height simple to operate, pollution-free, comprehensive, and the system pneumatolytic is originally low, is suitable for fixed bed intermittent gas furnace transformation newly-built or to extensively moving at present.Beneficial effect of the present invention is:

1, extracts the higher tar of economic worth in the non-hard coal of raw material, can reduce the gas maked coal production cost.

2, because gasification section coal gas direct destructive distillation epimere feed coal, thus destructive distillation air cooling but the time phenol water generates amount few, be easy to handle free from environmental pollution.

3, the effective pneumatolytic part of hypomere gasification section coal gas that makes is high, has both adapted to production synthetic ammonia and has used as unstripped gas, also adapts to the unstripped gas as synthesizing methanol, methane.

4, the epimere retort section coal gas methane content height that makes, a nitrogen content is low, and the calorific value height can be used as substitute natural gas and uses and the high heating value gas turbine power generation after rough purification, also further use whole like this vapourizing furnace cold gas efficiency height as synthetic raw gas after the purifying treatment.

Description of drawings

Accompanying drawing 1 is a method flow synoptic diagram of making the compound outer thermosetting fixed bed two stage type gasization of gas for embodiments of the invention continuously, wherein has lock gas coal feeder 1, retort section 2, gasification section 3, retort section fly-ash separator 4, electro detarrer 5, water cooler 6, electricity to remove light oil device 7, induced draft fan 8, retort section coal gas gas holder 9, gasification section fly-ash separator 10, waste heat boiler 11, scrubber tower 12, gasification section coal gas gas holder 13.

Accompanying drawing 2 is the method flow synoptic diagram for the compound outer thermosetting fixed bed two stage type gasization of embodiments of the invention Cyclic Gas-making, wherein has lock gas coal feeder 1, retort section 2, gasification section 3, retort section fly-ash separator 4, electro detarrer 5, water cooler 6, electricity to remove light oil device 7, induced draft fan 8, retort section coal gas gas holder 9, gasification section fly-ash separator 10, waste heat boiler 11, scrubber tower 12, gasification section coal gas gas holder 13, blowing air fly-ash separator 14, blowing air sensible heat combustion heat recovery process 15.

Accompanying drawing 3 is to be the compound outer thermosetting fixed bed two stage type gas furnace structure synoptic diagram of embodiments of the invention, and lock gas coal supply apparatus 101, retort section coal gas interface 102, retort section refractory brick marshalling 103, ring gas path 10 4, combustion product gases outlet 105, annular exhaust steam passage 106, blast tube 107, retort section body of heater 108, pipe core 109, gas burner 110, gasification section body of heater 111, water jacket 112, grate 113, furnace bottom ash handling equipment 114, furnace bottom gas interface 115, gasification section gas exit 116 side branch 117, point for measuring temperature 118 are wherein arranged.

Embodiment

A kind of method of compound outer thermosetting fixed bed two stage type gasization, it is characterized in that: the non-hard coal of system gas raw material enters the fixed bed retort section by the control of lock gas coal feeder, become semicoke at the retort section feed coal by outer hot destructive distillation, destructive distillation is warm eventually below 900 ℃, red-hot semicoke enters gasification section then, carry out continuous gasification or cycle gasification at gasification section inner oxidizing agent and vaporized chemical and semicoke, the coal gas that the gasification section gasification produces is through the gasification gas fly-ash separator, waste heat boiler, the cooling washing tower is sent into gasification section coal gas gas holder, and the coal gas that retort section produces is through the dry distillation gas fly-ash separator, electro detarrer, water cooler, electricity removes the light oil device, send into retort section coal gas gas holder behind the induced draft fan.

Described non-hard coal is meant the lump coal of high-volatile bituminous coal such as non-caking coal, weakly caking coal, long-flame coal, brown coal or the moulded coal of its making.

Described outer hot pyrogenous thermal barrier is any or multiple of gaseous heat-carrier, liquid thermophore, solid thermal carriers; Described outer hot pyrogenous heat of liquid carrier is steam, thermal oil, fused salt; The combustion high temperature flue gas that described outer hot pyrogenous gaseous heat-carrier is retort section coal gas or combustiblesubstance.

Described gasification section is made gas continuously, is to be oxygenant with the oxygen-rich air, is that vaporized chemical makes by gasification section continuously can be for the unstripped gas of Ammonia Production with steam; Or be oxygenant with oxygen, be that vaporized chemical makes by gasification section continuously can be for the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen with steam; Or be oxygenant with oxygen, be that vaporized chemical makes the unstripped gas that is rich in carbon monoxide by gasification section continuously with the carbonic acid gas.

A kind of compound outer thermosetting fixed bed two stage type gas stove, comprise lock gas coal supply apparatus 101, retort section body of heater 108, gasification section body of heater 111, grate 113, furnace bottom ash handling equipment 114, it is characterized in that: lock gas coal supply apparatus 101 links to each other with retort section body of heater 108, retort section body of heater 108 links to each other with gasification section body of heater 111, gasification section body of heater 111 links to each other with furnace bottom ash handling equipment 114 and grate 113, connect furnace bottom gas interface 115 in the middle of the furnace bottom, retort section body of heater 108 tops connect retort section coal gas interface 102, and water jacket 112 is arranged around the gasification section body of heater 111; There is a pipe core 109 at the center of retort section body of heater inner chamber, and there are several side branch 117 upper end of pipe core 109, and each side branch 117 gathers by ring gas path 10 4 and connects gasification section gas exit 116; Retort section body of heater 108 sidewalls are provided with refractory brick marshalling 103, several blast tubes 107 of circumference uniform distribution are pressed in the centre of retort section body of heater 108 sidewall middle and lower part refractory brick marshallings, the bottom inlet of each blast tube 107 connects gas burner 110, be provided with several points for measuring temperature 118 in each blast tube, the top of several blast tubes 107 is gathered by annular exhaust steam passage 106 and is connected combustion product gases outlet 105.

Below in conjunction with the drawings and specific embodiments the present invention is done further explanation.

As shown in Figure 1, embodiments of the invention are made the method flow synoptic diagram of the compound outer thermosetting fixed bed two stage type gasization of gas continuously, the non-hard coal of system gas raw material enters static bed coal gasification retort section 2 by 1 control of lock gas coal feeder, become semicoke at the retort section feed coal by outer hot destructive distillation, destructive distillation is warm eventually below 900 ℃, red-hot semicoke enters gasification section 3 then, the oxygenant and the vaporized chemical that feed with the bottom in gasification section 3 carry out continuous gasification, the coal gas that gasification section 3 gasifications produce leaves after the gasification section and retort section 2 feed coal indirect heat exchanges, provide the destructive distillation heat to it, not enough heat adopts external destructive distillation thermal barrier indirect heat exchange to replenish and offers retort section 2 feed coals, gasification section coal gas after the heat exchange is through 10 dedustings of gasification section fly-ash separator, reclaim sensible heat through waste heat boiler 11 then, again through sending into gasification section coal gas gas holder 13 after the scrubber tower 12 washing coolings.

Retort section 2 feed coals produce dry distillation gas through after the indirect destructive distillation, retort section coal gas captures tar through electro detarrer 5 then through 4 dedustings of retort section fly-ash separator, again through supercooler 6 coolings, go electricity to remove light oil device 7 then and capture light oil, send into retort section coal gas gas holder 9 through induced draft fan 8 again.

Because gasification section is the gasification reaction that the semicoke after vaporized chemical and the destructive distillation carries out, so it is extremely low that gasification section coal gas does not contain tar and methane content substantially, gasification section coal gas composition and hard coal fixed bed interrupter method producer gas generator coal gas basically identical can directly use as the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen.

Retort section coal gas is owing to nonnitrogenous substantially gas, and main component is methane and hydrogen, so its calorific value is very high, uses through can be used as the city substitute natural gas after further purifying.Retort section coal gas is because the calorific value height also can use the high high heating value gas turbine power generation of generating efficiency.In addition, retort section coal gas also can produce H through the steam reforming reaction of methane ₂With the effective pneumatolytic part of CO, can be used as the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen and use, the total system cold gas efficiency also is improved like this.

Described outer hot pyrogenous thermal barrier is any or multiple of gaseous heat-carrier, liquid thermophore, solid thermal carriers; Described outer hot pyrogenous heat of liquid carrier is steam, thermal oil, fused salt; The combustion high temperature flue gas that described outer hot pyrogenous gaseous heat-carrier is gasification section coal gas and combustiblesubstance.When retort section heat that the sensible heat of hypomere gasification section coal gas is not enough to provide required, adopt the combustion high temperature flue gas additional heat of combustiblesubstance.Combustiblesubstance can be retort section coal gas or other inflammable gas, flammable solid, flammable liquid.

As shown in Figure 2, the method flow synoptic diagram of the compound outer thermosetting fixed bed two stage type gasization of embodiments of the invention Cyclic Gas-making

The non-hard coal of system gas raw material enters static bed coal gasification retort section 2 by 1 control of lock gas coal feeder, become semicoke at the retort section feed coal by outer hot destructive distillation, destructive distillation is warm eventually below 900 ℃, red-hot semicoke enters gasification section 3 then, and the vaporized chemical that oxygenant that feeds with the bottom in gasification section 3 and alternatively up and down feed carries out cycle gasification.

When gasification section 3 fed oxygenant from the bottom, the accumulation of heat of burning provided heat for gasifying stage to the semicokes in the gasification section 3, and the blowing air that gasification section 3 produces is gone 14 dedustings of blowing air fly-ash separator, sends into blowing air sensible heat combustion heat recovery process 15 then and handles.When the vaporized chemical of gasification section 3 alternatively up and down feeding carries out cycle gasification, can produce up coal gas and descending coal gas, the up coal gas that produces leaves after the gasification section and retort section 2 feed coal indirect heat exchanges, provide the destructive distillation heat to it, not enough heat adopts external destructive distillation thermal barrier indirect heat exchange to replenish and offers retort section 2 feed coals, gasification section coal gas after the heat exchange is through 10 dedustings of gasification section fly-ash separator, reclaim sensible heat through waste heat boiler 11 then, again through sending into gasification section coal gas gas holder 13 after the scrubber tower 12 washing coolings; The descending coal gas that produces leaves after the gasification section through 10 dedustings of gasification section fly-ash separator, reclaims sensible heats through waste heat boiler 11 then, again through sending into gasification section coal gas gas holder 13 after the scrubber tower 12 washing coolings.Oxygenant, vaporized chemical, the up coal gas of gasification section, the descending coal gas of gasification section all carry out switching controls by electromagnetic fuel pressure control valve valve follow procedure.

The next stage begins recirculation from the blowing stage again.

As shown in Figure 3, the compound outer thermosetting fixed bed two stage type gas stove of embodiments of the invention, comprise lock gas coal supply apparatus 101, retort section body of heater 108, gasification section body of heater 111, grate 113, furnace bottom ash handling equipment 114, it is characterized in that: lock gas coal supply apparatus 101 links to each other with retort section body of heater 108, retort section body of heater 108 links to each other with gasification section body of heater 111, gasification section body of heater 111 links to each other with furnace bottom ash handling equipment 114 and grate 113, connect furnace bottom gas interface 115 in the middle of the furnace bottom, retort section body of heater 108 tops connect retort section coal gas interface 102, and water jacket 112 is arranged around the gasification section body of heater 111; There is a pipe core 109 at the center of retort section body of heater inner chamber, and there is side branch 117 upper end of pipe core 109, and each side branch 117 gathers by ring gas path 10 4 and connects gasification section gas exit 116; Retort section body of heater 108 sidewalls are provided with refractory brick marshalling 103, several blast tubes 107 of circumference uniform distribution are pressed in the centre of retort section body of heater 108 sidewall middle and lower part refractory brick marshallings, the bottom inlet of each blast tube 107 connects gas burner 110, be provided with several points for measuring temperature 118 in each blast tube, the top of several blast tubes 107 is gathered by annular exhaust steam passage 106 and is connected combustion product gases outlet 105.

Feed coal enters retort section body of heater 108 through lock gas coal supply apparatus 101, and destructive distillation becomes semicoke, the sensible heat of combustion product gases in the sensible heat of destructive distillation origin of heat gasification section coal gas in pipe core 109 and the blast tube 107 indirectly in retort section body of heater 108.

Dry distillation gas is discharged through retort section coal gas interface 102, enters the dry distillation gas cleaning section.Semicoke after the destructive distillation falls into and carries out gasification in the gasification section body of heater 111, and gasification is finished the lime-ash of generation and discharged by grate 113 breaks and furnace bottom ash handling equipment 114.

When gasification section adopted continuously system gas, furnace bottom gas interface 115 connected oxygenant and vaporized chemical pipeline valve; When gasification section adopted Cyclic Gas-making, furnace bottom gas interface 115 connected oxygenant and descending gas line valve.

No matter gasification section adopts the system gas or the method for Cyclic Gas-making continuously, its up gasification section coal gas all passes through pipe core 109 indirect heat exchanges at retort section body of heater center and gives the retort section feed coal, reclaimed the sensible heat of gasification section coal gas, up gasification section coal gas is discharged by gasification section gas exit 116 at last, enters the gasification section gas heat and reclaims and cleaning section.After gas burner 110 burnings of fuel gas through retort section, the high-temperature flue gas that produces is through refractory brick marshalling blast tube 107, combustion product gases discord gasification section and retort section in the blast tube 107 are communicated with, and only by the form of indirect heat exchange the retort section feed coal are provided by providing of heat.Like this feed coal retort section through two kinds outside indirectly destructive distillation of heat, not only destructive distillation uniform and complete, and combustion product gases do not mix the epimere dry distillation gas, improved the utility value of dry distillation gas.

For the present invention being described better rather than limiting its protection domain, list following examples:

Embodiment one

As shown in Figure 1, make the method flow synoptic diagram of the compound outer thermosetting fixed bed two stage type gasization of gas continuously, the non-hard coal of system gas raw material enters static bed coal gasification retort section 2 by 1 control of lock gas coal feeder, become semicoke at the retort section feed coal by outer hot destructive distillation, destructive distillation is warm eventually below 900 ℃, red-hot semicoke enters gasification section 3 then, the oxygenant and the vaporized chemical that feed with the bottom in gasification section 3 carry out continuous gasification, the coal gas that gasification section 3 gasifications produce leaves after the gasification section and retort section 2 feed coal indirect heat exchanges, provide the destructive distillation heat to it, not enough heat adopts external destructive distillation thermal barrier indirect heat exchange to replenish and offers retort section 2 feed coals, gasification section coal gas after the heat exchange is through 10 dedustings of gasification section fly-ash separator, reclaim sensible heat through waste heat boiler 11 then, again through sending into gasification section coal gas gas holder 13 after the scrubber tower 12 washing coolings.Retort section 2 feed coals produce dry distillation gas through after the indirect destructive distillation, retort section coal gas captures tar through electro detarrer 5 then through 4 dedustings of retort section fly-ash separator, again through supercooler 6 coolings, go electricity to remove light oil device 7 then and capture light oil, send into retort section coal gas gas holder 9 through induced draft fan 8 again.

Present embodiment is oxygenant with the oxygen-rich air, with steam is that vaporized chemical makes the unstripped gas that meets Ammonia Production by gasification section continuously, because gasification section is the gasification reaction that the semicoke after vaporized chemical and the destructive distillation carries out, so it is extremely low that gasification section coal gas does not contain tar and methane content substantially, gasification section coal gas composition and hard coal fixed bed interrupter method producer gas generator coal gas basically identical can directly use as the unstripped gas of producing synthetic ammonia.

Embodiment two

As shown in Figure 1, make the method flow synoptic diagram of the compound outer thermosetting fixed bed two stage type gasization of gas continuously.

Present embodiment is an oxygenant with oxygen, is that vaporized chemical makes the unstripped gas that can supply to produce synthetic ammonia, methyl alcohol, methane, hydrogen by gasification section continuously with steam, and all the other are with embodiment one.

Embodiment three

Present embodiment is an oxygenant with oxygen, is that vaporized chemical makes the unstripped gas that is rich in carbon monoxide by gasification section continuously with the carbonic acid gas.The unstripped gas that is rich in carbon monoxide can be used for producing Chemicals such as acetic acid, formic acid, sodium formiate, and all the other are with embodiment one.

Embodiment four

As shown in Figure 2, the method flow synoptic diagram of the compound outer thermosetting fixed bed two stage type gasization of Cyclic Gas-making.

Present embodiment can be for the unstripped gas of producing synthetic ammonia with any alternately the making by gasification section as vaporized chemical as oxygenant and steam of air, oxygen-rich air, oxygen, the system gas stage be divided into successively in order blowing, recovery, on blow, blow down, blow, blow off six stages on the secondary.

Embodiment five

Present embodiment can be for the unstripped gas of producing methyl alcohol, methane, hydrogen with any alternately the making by gasification section as vaporized chemical as oxygenant and steam of air, oxygen-rich air, oxygen, the system gas stage is divided into blowing, once blows off, on blow, blow down, blow on the secondary, secondary blows off six stages.All the other are with embodiment four.

Embodiment six

Present embodiment can be for the unstripped gas of producing rich carbon monoxide such as acetic acid, sodium formiate with any alternately the making by gasification section as vaporized chemical as oxygenant and carbonic acid gas of air, oxygen-rich air, oxygen, system the gas stage is divided into blowing, once blows off, on blow, blow down, blow on the secondary, secondary blows off, all the other are with embodiment four.

Embodiment seven

As shown in Figure 3, compound outer thermosetting fixed bed two stage type gas stove comprises lock gas coal supply apparatus 101, retort section body of heater 108, gasification section body of heater 111, grate 113, furnace bottom ash handling equipment 114.Lock gas coal supply apparatus 101 links to each other with retort section body of heater 108, retort section body of heater 108 links to each other with gasification section body of heater 111, gasification section body of heater 111 links to each other with furnace bottom ash handling equipment 114 and grate 113, connect furnace bottom gas interface 115 in the middle of the furnace bottom, retort section body of heater 108 tops connect retort section coal gas interface 102, and water jacket 112 is arranged around the gasification section body of heater 111; There is a pipe core 109 at the center of retort section body of heater inner chamber, and there is side branch 117 upper end of pipe core 109, and each side branch 117 gathers by ring gas path 10 4 and connects gasification section gas exit 116; Retort section body of heater 108 sidewalls are provided with refractory brick marshalling 103, several blast tubes 107 of circumference uniform distribution are pressed in the centre of retort section body of heater 108 sidewall middle and lower part refractory brick marshallings, the bottom inlet of each blast tube 107 connects gas burner 110, be provided with several points for measuring temperature 118 in each blast tube, the top of several blast tubes 107 is gathered by annular exhaust steam passage 106 and is connected combustion product gases outlet 105.

The present embodiment gasification section adopts system gas continuously, furnace bottom gas interface 115 connects oxygenant and vaporized chemical pipeline valve, up gasification section coal gas is given the retort section feed coal through pipe core 109 indirect heat exchanges at retort section body of heater center, reclaimed the sensible heat of gasification section coal gas, up gasification section coal gas is discharged by gasification section gas exit 116 at last, enters the gasification section gas heat and reclaims and cleaning section.After gas burner 110 burnings of fuel gas through retort section, the high-temperature flue gas that produces is through refractory brick marshalling blast tube 107, combustion product gases discord gasification section and retort section in the blast tube 107 are communicated with, and only by the form of indirect heat exchange the retort section feed coal are provided by providing of heat.Like this feed coal retort section through two kinds outside indirectly destructive distillation of heat, not only destructive distillation uniform and complete, and combustion product gases do not mix the epimere dry distillation gas, improved the utility value of dry distillation gas.

Embodiment eight

As shown in Figure 3, compound outer thermosetting fixed bed two stage type gas stove, comprise lock gas coal supply apparatus 101, retort section body of heater 108, gasification section body of heater 111, grate 113, furnace bottom ash handling equipment 114, it is characterized in that: lock gas coal supply apparatus 101 links to each other with retort section body of heater 108, retort section body of heater 108 links to each other with gasification section body of heater 111, gasification section body of heater 111 links to each other with furnace bottom ash handling equipment 114 and grate 113, connect furnace bottom gas interface 115 in the middle of the furnace bottom, retort section body of heater 108 tops connect retort section coal gas interface 102, and water jacket 112 is arranged around the gasification section body of heater 111; There is a pipe core 109 at the center of retort section body of heater inner chamber, and there is side branch 117 upper end of pipe core 109, and each side branch 117 gathers by ring gas path 10 4 and connects gasification section gas exit 116; Retort section body of heater 108 sidewalls are provided with refractory brick marshalling 103, several blast tubes 107 of circumference uniform distribution are pressed in the centre of retort section body of heater 108 sidewall middle and lower part refractory brick marshallings, the bottom inlet of each blast tube 107 connects gas burner 110, be provided with several points for measuring temperature 118 in each blast tube, the top of several blast tubes 107 is gathered by annular exhaust steam passage 106 and is connected combustion product gases outlet 105.

The present embodiment gasification section adopts Cyclic Gas-making, furnace bottom gas interface 115 connects oxygenant and descending gas line valve, up gasification section coal gas and blowing air are all passed through pipe core 109 indirect heat exchanges at retort section body of heater center and are given the retort section feed coal, have reclaimed the sensible heat of gasification section coal gas and blowing air.When gasification section fed oxygenant from the bottom, the accumulation of heat of burning provided heat for gasifying stage to the semicoke in the gasification section, and the blowing air that gasification section produces goes blowing air dedusting, sensible heat combustion heat recovery process to handle.When gasification section fed vaporized chemical from the bottom, up gasification section coal gas was discharged by gasification section gas exit 116 at last, entered the gasification section gas heat and reclaimed and cleaning section.

After gas burner 110 burnings of fuel gas through retort section, the high-temperature flue gas that produces is through refractory brick marshalling blast tube 107, combustion product gases discord gasification section and retort section in the blast tube 107 are communicated with, and only by the form of indirect heat exchange the retort section feed coal are provided by providing of heat.Like this feed coal retort section through two kinds outside indirectly destructive distillation of heat, not only destructive distillation uniform and complete, and combustion product gases do not mix the epimere dry distillation gas, improved the utility value of dry distillation gas.

Claims

1. the method for a compound outer thermosetting fixed bed two stage type gasization, it is characterized in that: the non-hard coal of system gas raw material enters the fixed bed retort section by the control of lock gas coal feeder, become semicoke at the retort section feed coal by outer hot destructive distillation, destructive distillation is warm eventually below 900 ℃, red-hot semicoke enters gasification section then, carry out continuous gasification or cycle gasification at gasification section inner oxidizing agent and vaporized chemical and semicoke, the coal gas that the gasification section gasification produces is through the gasification gas fly-ash separator, waste heat boiler, the cooling washing tower is sent into gasification section coal gas gas holder, and the coal gas that retort section produces is through the dry distillation gas fly-ash separator, electro detarrer, water cooler, electricity removes the light oil device, send into retort section coal gas gas holder behind the induced draft fan.

2. the method for a kind of compound outer thermosetting fixed bed two stage type gasization according to claim 1 is characterized in that: described non-hard coal is the lump coal of non-caking coal, weakly caking coal, long-flame coal and brown coal in the bituminous coal or the moulded coal of its making.

3. the method for a kind of compound outer thermosetting fixed bed two stage type gasization according to claim 1, it is characterized in that: described gasification section is made gas continuously, being to be oxygenant with the oxygen-rich air, is that vaporized chemical makes by gasification section continuously can be for the unstripped gas of Ammonia Production with steam; Or be oxygenant with oxygen, be that vaporized chemical makes by gasification section continuously can be for the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen with steam; Or be oxygenant with oxygen, be that vaporized chemical makes the unstripped gas that is rich in carbon monoxide by gasification section continuously with the carbonic acid gas.

4. the method for a kind of compound outer thermosetting fixed bed two stage type gasization according to claim 1, it is characterized in that: described gasification section Cyclic Gas-making is can be for the unstripped gas of producing synthetic ammonia, methyl alcohol, methane, hydrogen with any alternately the making by gasification section as vaporized chemical as oxygenant and steam of air, oxygen-rich air, oxygen; Or with air, oxygen-rich air, oxygen is any alternately makes the unstripped gas that is rich in carbon monoxide by gasification section as oxygenant and carbonic acid gas as vaporized chemical.

5. the method for a kind of compound outer thermosetting fixed bed two stage type gasization according to claim 1 is characterized in that: described outer hot pyrogenous thermal barrier is any or multiple of gaseous heat-carrier, liquid thermophore, solid thermal carriers.

6. the method for a kind of compound outer thermosetting fixed bed two stage type gasization according to claim 5 is characterized in that the combustion high temperature flue gas that described outer hot pyrogenous gaseous heat-carrier is gasification section coal gas and combustiblesubstance.

7. the method for a kind of compound outer thermosetting fixed bed two stage type gasization according to claim 6 is characterized in that described combustiblesubstance is any or multiple of inflammable gas, flammable solid, flammable liquid.

8. the method for a kind of compound outer thermosetting fixed bed two stage type gasization according to claim 7 is characterized in that described inflammable gas is a retort section coal gas.

9. compound outer thermosetting fixed bed two stage type gas stove, comprise lock gas coal supply apparatus (101), retort section body of heater (108), gasification section body of heater (111), grate (113), furnace bottom ash handling equipment (114), it is characterized in that: lock gas coal supply apparatus (101) links to each other with retort section body of heater (108), retort section body of heater (108) links to each other with gasification section body of heater (111), gasification section body of heater (111) links to each other with furnace bottom ash handling equipment (114) and grate (113), connect furnace bottom gas interface (115) in the middle of the furnace bottom, retort section body of heater (108) top connects retort section coal gas interface (102), and gasification section body of heater (111) has water jacket (112) on every side; There is a pipe core (109) at the center of retort section body of heater inner chamber, and there are several side branch (117) upper end of pipe core (109), and each side branch (117) gathers by ring gas passage (104) and connects gasification section gas exit (116); Retort section body of heater (108) sidewall is provided with refractory brick marshalling (103), several blast tubes of circumference uniform distribution (107) are pressed in the centre of retort section body of heater (108) sidewall middle and lower part refractory brick marshalling, the bottom inlet of each blast tube (107) connects gas burner (110), be provided with several points for measuring temperature (118) in each blast tube, the top of several blast tubes (107) is gathered by annular exhaust steam passage (106) and is connected combustion product gases outlet (105).