CN103980951A - Method and device for producing coal gas by pulverized coal pyrolysis - Google Patents
Method and device for producing coal gas by pulverized coal pyrolysis Download PDFInfo
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- CN103980951A CN103980951A CN201410219517.XA CN201410219517A CN103980951A CN 103980951 A CN103980951 A CN 103980951A CN 201410219517 A CN201410219517 A CN 201410219517A CN 103980951 A CN103980951 A CN 103980951A
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Abstract
The invention relates to a method and device for producing a coal gas by pulverized coal pyrolysis. The coal gas production method disclosed by the invention comprises the following step: with an unpurified raw gas which is obtained from raw coal by dry distillation pyrolysis as a raw material, producing the high-quality coal gas inside a regenerative chamber in a pyrolysis manner. The device disclosed by the invention comprises a raw coal drying oven, a dry distillation furnace, a regenerative chamber for pyrolyzing the raw gas, and a hot blast heater for supplying heat. The raw gas is pyrolyzed to produce the coal gas, water vapor in the raw gas reacts with coke powder to produce a water gas, and meanwhile tar is cracked into the coal gas, so as to serve multiple purposes. The method and device disclosed by the invention have the advantages of low energy consumption, low investment, high calorific value of the gas, low semicoke ash and low coal quality transformation cost.
Description
Technical field
The present invention relates to coal carbonization technology, be specifically related to method and device that coal gas is prepared in a kind of pyrolysis of coal.
Background technology
It is that coal transforms important technique approach that gasification is prepared coal gas, adopts High Temperature High Pressure coal gasifying process, equipment complexity, and scale of investment is large; Adopt normal pressure gas metallization processes, pollute greatly, coal low conversion rate, caloric power of gas is low.
Obtain coal gas investment by pyrolysis of coal little, cost is low, but traditional pyrolysis of coal is mostly internal heat type technique, and in coal gas, a nitrogen content is high, and caloric power of gas is low.
Traditional external-heat pyrolysis of coal gained caloric power of gas is high, but gas yield is low, and thermo-efficiency is low, tar trapping complex process.
Just traditional gaseous heat-carrier pyrolyzing coal often needs the coupling with gasification to have practicality, in order to obtain tar, reheats after gaseous heat-carrier is cooling, energy consumption is high, uneconomical.
How realizing sub-prime conversion by directly obtaining semicoke and coal gas after pyrolysis of coal, simplify technique, reduce investment, reduce pollution, is that the problem that coal gas faces is prepared in pyrolysis of coal.
Summary of the invention
For defect or the deficiency of prior art, one of object of the present invention is to provide a kind of coal gas production method.
For this reason, coal gas production method provided by the invention comprises: taking raw gas as raw material, produce coal gas by pyrolysis, described raw gas is the mixed gas that does not pass through purification and tar removing producing in dry distillation of coal process.
For defect or the deficiency of prior art, two of object of the present invention is to provide a kind of gas producing device.
For this reason, gas producing device provided by the invention comprises regenerator, raw gas in regenerator by pyrolysis.
Described gas producing device comprises regenerator, and described regenerator comprises container body and be filled in the heat-storing material in container body, and described heat-storing material is that at room temperature～1000 DEG C, thermal expansivity is less than 5 × 10
-6the ceramic honeycomb fire resistant materials that ∕ K, porosity ranges are 30%～63%, refractoriness under load is greater than 1350 DEG C.
Temperature in described regenerator is 500～1000 DEG C, and the pass of the specific surface area of raw gas flow and heat-storing material is: (3～8BM
3∕ H)/M
2.
For defect or the deficiency of prior art, three of object of the present invention is to provide a kind of fine coal method for destructive distillation.
For this reason, fine coal method for destructive distillation provided by the invention comprises:
Raw coal preheating is with dry: raw coal is carried out to preheating and drying, obtain the raw coal after preheating and drying;
The dry distillation of coal: the raw coal after preheating and drying is carried out to pyrogenation and carbonization, obtain semicoke and raw gas;
Raw gas pyrolysis: raw gas is carried out to pyrolysis, obtain coal gas.
Preferably, a described coal gas part reclaims as coal gas product, and a part, as the thermal barrier of the dry distillation of coal, is carried out direct heating to the raw coal after preheating and drying.
For defect or the deficiency of prior art, four of object of the present invention is to provide a kind of fine coal destructive distillation device.
For this reason, fine coal destructive distillation device provided by the invention comprises:
Drying oven is the rotary kiln of external-heat fume indirect heating, for the preheating and drying of raw coal;
Gas retort, for the internal heat type of gas heating heats with flue gas external-heat the rotary kiln combining, for the dry distillation of coal, produces semicoke and raw gas;
Regenerator, for hot flue gas-coal gas gas regenerator interchanger, for raw gas is carried out to pyrolysis, produces coal gas;
Hotblast stove is coal-fired high temperature hot-blast furnace;
The raw gas of producing in described gas retort is conveyed into regenerator and carries out pyrolysis production coal gas;
The coal gas part producing in described regenerator is conveyed into the raw coal of described gas retort after to drying and preheating and carries out direct heating, and another part is coal gas product; The hot flue gas part simultaneously producing in hotblast stove is conveyed into the raw coal of gas retort after to drying and preheating and carries out indirect heating, and another part is used for heating regenerator.
Preferably, the hot flue gas after described regenerator heat exchange and the hot flue gas that goes out gas retort are conveyed into drying oven raw coal are carried out to indirect heating;
Preferably, the raw gas produced in described gas retort is discharged after gas retort after fly-ash separator is isolated the coke powder dust that particle is greater than 10 microns and is conveyed into regenerator pyrolysis heat exchange, heated cracking obtains coal gas, wherein, the coal gas of 80% mass percent is sent into pyrolysis oven, and the coal gas of 20% mass percent is recovered.
Preferably, described regenerator comprises two regenerator monomers, and these two regenerator monomers adopt the mode of regularly commutation to realize the heat exchange of hot flue gas and coal gas.
Compared with prior art, beneficial effect of the present invention is:
(1) in raw gas, contain water vapour, finely-ground coke, scrubbed gas and tar, raw gas is carried out to pyrolysis and produce coal gas, the water vapor in raw gas and coke powder water generation reaction coal gas, tar is cracked into coal gas simultaneously, achieves many things at one stroke.
(2) utilize the equipment of regenerator as raw gas pyrolysis, carrier regenerator wherein can play to the dust in coal gas the effect of filtration, can obtain pure coal gas.
(3) heat-storing material in regenerator adopts the ceramic particle with coke tar cracking catalysis, can suitably reduce cracking temperature, and raw gas cracking degree is high.
(4) the pre-thermal recovery external-heat of raw coal is dried, and avoids drying course raw coal on fire, can suitably improve preheating temperature simultaneously, alleviates the thermal load of gas retort, can be preheating to and approach 300 degree.
(5) heating gas, as the direct heating thermal barrier of the dry distillation of coal, recycles, and it is convenient to carry, and adopts external-heat heating pyrolysis oven simultaneously, interior external heat, and thermo-efficiency is high, and output is large.
(6) remain in coal dust in regenerator burned, reduce fuel cost, after regenerator heat exchange, fume afterheat is used for drying raw coal, and thermal utilization is high.
(7) tar yield is low, and purification system is simple, there is no sewage discharge, and technique is simple.
To sum up, the method for coal gas is prepared in pyrolysis of coal of the present invention, and energy consumption is low, invests lowly, and caloric power of gas is high, and semicoke ash content is low, and it is low that coal sub-prime transforms cost.
Brief description of the drawings
Below in conjunction with accompanying drawing and embodiment, the present invention is further explained in detail to explanation.
Fig. 1 is fine coal destructive distillation device structure reference view of the present invention;
Fig. 2 is the fine coal destructive distillation device structure reference view of embodiment;
Each coded representation in figure: 1-drying oven, 2-gas retort, 3-regenerator, 4-tornado dust collector, 5-coal gas cooling heat exchanger, 6-hotblast stove, 7-recirculation blower, 8-raw coal lifting gear.
Embodiment
Except as otherwise noted, the implication of each term of the present invention is those skilled in the art's routine understanding.
In raw gas, contain scrubbed gas and a large amount of finely-ground coke and tar, for obtaining high yield and high-quality coal gas, the present invention takes the method for raw gas being done to further pyrolysis to produce coal gas, and the coal gas purity that the method is obtained is high, and dust and tar content are low.
The heat-storing material of filling in regenerator of the present invention can be the conventional heat-storing material that chemical field uses, and preferably thermal expansivity (room temperature～1000 DEG C) is less than 5 × 10
-6the ceramic honeycomb fire resistant materials of ∕ K, this material possesses pyrolysis catalysts function; Simultaneously, consider the filtration to dust, the porosity ranges of heat-storing material is 30%～63%, make heat-storing material possess Bed Filtration function simultaneously, consider heat storage own wt and height problem, its refractoriness under load should be greater than 1350 DEG C, and while ensureing to use, heat storage can not collapse.
Consider the temperature requirement problem after gaseous heat-carrier heat exchange, the temperature in regenerator is controlled at 500～1000 DEG C; Consider heat storage heat storage capacity problem, the specific surface area (M of raw gas flow (BM3 ∕ H) and heat-storing material simultaneously
2) be related to that ratio is: (3～8): 1, flow corresponding to the specific surface area of every square metre is (3～8) BM
3∕ H, can better ensure that the gaseous heat-carrier after heat exchange reaches the needed temperature of pyrolysis of coal like this.
The coal gas part producing in regenerator of the present invention is conveyed into the raw coal of described gas retort after to drying and preheating and carries out direct heating, for gaseous heat-carrier circulating gas, preferably, circulating gas amount is four times of pyrolysis of coal gas production rate, and another part is the coal gas product of the coal gas amount equivalent of pyrolysis of coal generation; The hot flue gas part simultaneously producing in hotblast stove is conveyed into the raw coal of gas retort after to drying and preheating and carries out indirect heating, and another part is used for heating regenerator.
Below the specific embodiment that contriver provides, so that technical scheme of the present invention is further explained to explanation.
Embodiment:
With reference to figure 1 and Fig. 2, the device of this embodiment comprises drying oven 1, gas retort 2, regenerator 3 and hotblast stove 6;
Drying oven 1 is flue gas external-heat drying oven, gas retort 2 is the solid of revolution stove of external-heat and internal heat type combination, regenerator 3 comprises two regenerator monomers, the structure of two monomers is identical, include container body and the heat-storing material that is filled in container body, two regenerator monomers adopt the modes of regularly commutation to realize the heat exchange of hot flue gas and coal gas;
Wherein drying oven 1 is positioned at the top of gas retort 2, and drying oven 1 outlet is connected with gas retort 2 imports, 4 imports are connected with tornado dust collector in gas retort 2 raw gas outlets, 7 imports are connected with recirculation blower in tornado dust collector 4 outlets, 3 imports are connected with regenerator in recirculation blower 7 outlets, and 2 gas inlets are connected with gas retort in regenerator 3 outlets.
In addition, the hot exhanst gas outlet of regenerator 3 and the hot exhanst gas outlet of gas retort 2 are connected with the hot flue gas of drying oven 1.Regenerator 3 heating carry out the hotblast stove 6 of spontaneous combustion coal with hot flue gas and the hot flue gas of gas retort 2 indirect heating, go out the hot flue gas of regenerator 3 for gas retort 2 external-heat heating.
Concrete distillation process is as follows:
Raw coal is the fine coal that particle is less than 0-30mm.Raw coal is promoted to drying oven 1 through raw coal lifting gear 8.
In drying oven 1, gas approach temperature is controlled at 500-600 DEG C, and fine coal stops 30-60 minute in drying oven, and temperature out is controlled within the scope of 25-300 DEG C.
In the inner core of gas retort 2, be connected with coal gaseous heat-carrier and by the coal of destructive distillation, the flue between urceolus and inner core is connected with the flue gas thermal barrier that indirect heating is used, the type of heating combining by outer heat and thermal barrier carries out destructive distillation heating to fine coal.The 250-300 of preheating DEG C dry coal and the interior heat exchange of the coal gas gas retort that is heated to 900 DEG C, be heated to the flue gas of 1000 DEG C enters pyrolysis oven chuck the coal of inner core is heated simultaneously, fine coal stops 20-40 minutes and becomes semicoke in gas retort, the temperature that goes out gas retort 2 semicokes is 400-550 DEG C, going out gas retort flue-gas temperature is 600 DEG C, gas retort rotating speed 0.5-2 rev/min, the volume filling ratio of material in rotary kiln is 30%-40%.Semicoke carries out quenching processing in cool furnace, and quenching is that indirect water-cooling quenching is main, and the quenching of auxiliary water spray steam combines, and semicoke dry method is discharged of the coke.
The raw gas that carries tar dust go out gas retort 2 temperature be controlled at 350 ?450 DEG C, after tornado dust collector 4 dedustings, enter coal gas recirculation blower 7, coal gas and tar dust mixture are sent into to be preheating to medial temperature be that the regenerator monomer of 1000 DEG C of left and right carries out heat exchange, it is 900 DEG C that coal gas goes out regenerator medial temperature, and flue gas goes out regenerator and is controlled at 600 DEG C.The hot flue gas heating heat-storing material of regenerator and cooling heat storage reversal interval time of coal gas are 20-40 minute.
The coal gas of high temperature that goes out regenerator 80% mass percent recycles, and the coal gas of 20% mass percent is cooling rear as output coal gas at coal gas cooling heat exchanger 5 and air heat-exchange, is combustion air after preheating of air.
The detection that the quality of the coal gas that coal gas (raw gas being carried out to dedusting, dry cooled coal gas) and this embodiment that contriver produces traditional technology produces is carried out, detected result is as shown in table 1.
Table 1 (wt/wt)
| Project | Water vapour | Dust Capacity | Tar | Scrubbed gas |
| The coal gas that traditional technology is produced | 5％ | 10％ | 30％ | 55％ |
| The coal gas that the present invention produces | 1％ | 3％ | 3％ | 93％ |
Claims (10)
1. a coal gas production method, is characterized in that, method comprises: taking raw gas as raw material, produce coal gas by pyrolysis, described raw gas is the mixed gas that does not pass through purification and tar removing producing in dry distillation of coal process.
2. a gas producing device, is characterized in that, device comprises regenerator, raw gas in regenerator by pyrolysis.
3. gas producing device as claimed in claim 2, it is characterized in that, described gas producing device comprises regenerator, and described regenerator comprises container body and be filled in the heat-storing material in container body, and described heat-storing material is that at room temperature～1000 DEG C, thermal expansivity is less than 5 × 10
-6the ceramic honeycomb fire resistant materials that ∕ K, porosity ranges are 30%～63%, refractoriness under load is greater than 1350 DEG C.
4. gas producing device as claimed in claim 2, is characterized in that, the temperature in described regenerator is 500～1000 DEG C, and the pass of the specific surface area of raw gas flow and heat-storing material is: (3～8BM
3∕ H)/M
2.
5. a fine coal method for destructive distillation, is characterized in that, method comprises:
Raw coal preheating is with dry: raw coal is carried out to preheating and drying, obtain the raw coal after preheating and drying;
The dry distillation of coal: the raw coal after preheating and drying is carried out to pyrogenation and carbonization, obtain semicoke and raw gas;
Raw gas pyrolysis: raw gas is carried out to pyrolysis in regenerator, obtain coal gas.
6. fine coal method for destructive distillation as claimed in claim 5, is characterized in that, a described coal gas part reclaims as coal gas product, and a part, as the thermal barrier of the dry distillation of coal, is carried out direct heating to the raw coal after preheating and drying.
7. a fine coal destructive distillation device, is characterized in that, this device comprises:
Drying oven is the rotary kiln of external-heat fume indirect heating, for the preheating and drying of raw coal;
Gas retort, for the internal heat type of gas heating heats with flue gas external-heat the rotary kiln combining, for the dry distillation of coal, produces semicoke and raw gas;
Regenerator, for hot flue gas-coal gas gas regenerator interchanger, for raw gas is carried out to pyrolysis, produces coal gas;
Hotblast stove is coal-fired high temperature hot-blast furnace;
The raw gas of producing in described gas retort is conveyed into regenerator and carries out pyrolysis production coal gas;
The coal gas part producing in described regenerator is conveyed into the raw coal of described gas retort after to drying and preheating and carries out direct heating, and another part is coal gas product; The hot flue gas part simultaneously producing in hotblast stove is conveyed into the raw coal of gas retort after to drying and preheating and carries out indirect heating, and another part is used for heating regenerator.
8. fine coal destructive distillation device as claimed in claim 7, is characterized in that, the hot flue gas after described regenerator heat exchange is conveyed into drying oven with the hot flue gas that goes out gas retort raw coal is carried out to indirect heating.
9. fine coal destructive distillation device as claimed in claim 7, it is characterized in that, the raw gas produced in described gas retort is discharged after gas retort after tornado dust collector are isolated the coke powder dust that particle is greater than 10 microns and is conveyed into regenerator pyrolysis heat exchange, heated cracking obtains coal gas, wherein, the coal gas of 80% mass percent is sent into pyrolysis oven, and the gas yield of 20% mass percent is recovered.
10. fine coal destructive distillation device as claimed in claim 7, is characterized in that, described regenerator comprises two regenerator monomers, and these two regenerator monomers adopt the mode of regularly commutation to realize the heat exchange of hot flue gas and coal gas.
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| CN105441138A (en) * | 2014-08-29 | 2016-03-30 | 中国石油化工股份有限公司 | Coal pyrolysis and gasification coproduction method |
| CN105542806A (en) * | 2016-01-27 | 2016-05-04 | 华东理工大学 | Device and method for producing clean fuel gas and biomass charcoal through continuous biomass carbonization |
| CN107523318A (en) * | 2017-09-15 | 2017-12-29 | 新疆广汇中化能源技术开发有限公司 | Pyrolysis of coal system |
| CN115029147A (en) * | 2022-07-04 | 2022-09-09 | 重庆科技学院 | Low-energy-consumption biomass pyrolysis device capable of recycling sensible heat of synthesis gas |
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Application publication date: 20140813 |