CN101429463B - Process for processing coal with low degree of metamorphism - Google Patents
Process for processing coal with low degree of metamorphism Download PDFInfo
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- CN101429463B CN101429463B CN2007101665568A CN200710166556A CN101429463B CN 101429463 B CN101429463 B CN 101429463B CN 2007101665568 A CN2007101665568 A CN 2007101665568A CN 200710166556 A CN200710166556 A CN 200710166556A CN 101429463 B CN101429463 B CN 101429463B
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Abstract
The invention provides a technique for processing coal with low metamorphism degree, which comprises the steps of crushing and sieving pretreatment. The technique is as follows: raw coal particles are sent into a drier, and subjected to anoxybiotic hot gas drying under normal pressure, wherein the drying condition is controlled to 10 to 50 cubic meters of hot gas required for each 1 kilogram of the coal, and the temperature of the raw coal particles is controlled to between 210 and 250 DEG C; the raw coal particles are sent into a pyrolysis apparatus, and high-temperature oxygen-poor hot gas is injected according to the flow ratio of 5 to 50 cubic meters per kilogram of coal, wherein the temperature of the oxygen-poor hot gas entering into a pyrolyzing furnace is controlled to between 400 and 950 DEG C, and the oxygen content is controlled to less than 6 percent of the volume; and the coal is fully mixed with the hot gas and heated to a temperature of between 530 and 580 DEG C. The technique has the advantages that the sulfur content is reduced compared with that in the raw coal, so that atmospheric pollution is reduced; solid products produced by the technique have high environment-friendly characteristic; the discharge amount of nitrogen oxide is obviously reduced; and atmospheric pollution is reduced.
Description
Technical field
The present invention relates to a kind of complete processing of low rank coal, particularly relate to low-disintegration coal is obtained the high heating value solid phase prod that is easy to transport and the Technology of high added value liquid product after super-dry/upgrading.
Background technology
Low rank coal is extremely abundant at the reserves of China, accounts for 40% of coal in China reserves greatly, mainly is distributed in provinces such as Yunnan, the Inner Mongol, northeast, Sichuan.Be characterized in the water content height, generally account for 20-60% (as received basis); Calorific value is low, is approximately 2500-4500 kilocalorie/kilogram; Volatile matter height, approximately 40-50% (dry ash-free basis).Most fuel of low rank coal, but ubiquity burning difficulty as the power station, the problem that thermal transition efficient is low.Because the low rank coal of process preliminary working does not have quite a few coal to be used to produce enough heats and evaporates the moisture that self contains, so crude coal energy effective utilization rate is low when burning.Have only water content in the raw coal before burning, could reduce the energy consumption of this moisture evaporation through effective dry or dehydration.For the low rank coal process for upgrading, traditional method is to carry out primary drying, and the combination water in the low rank coal is evaporated away.But these technology have following shortcoming: if the overwhelming majority of the moisture in the coal is removed, low rank coal is spontaneous combustion easily then, uses for industry, is difficult for storing.And the easy moisture absorption backwater of low rank coal behind the removal moisture returns to original characteristic.Also have a shortcoming to be, in traditional technology, when removing moisture through disposable simple heating, temperature is generally when several Baidu or pressure reach certain value, physical change and chemical reaction take place in low rank coal in the processing simultaneously, lose the part heat, emit large quantity of exhaust gas, contaminate environment simultaneously.
Technology among German patent DE-PS359440 is not add control to operate to take off the moisture in the coal in non-pressurized evaporative process for former coal dewatering, but this technology does not only fully remove combination water, the character of low rank coal is not improved, and moisture resorption problem does not solve.
The aqueous method of a kind of reduction low rank coal is disclosed in the Chinese patent 96108263.1, but this method complexity, and difficult control, at first this method need be carried out the decatize processing in to steam-tight seal-off pressure chamber, next utilizes press that remaining moisture content machinery is extruded, and the low rank coal moisture content residual volume that utilizes this method to obtain at last is big.
The present invention is a kind of dry rear section pyrolytic two-stage process (hereinafter referred to as " a low rank coal drying/upgrading two-stage process ").It need heat coal under the condition of strictness control.The drying step that physical change takes place is separated with the pyrolysis step that chemical transformation takes place.At last the pore space structure in the coal is carried out permanent damage, no longer from environment, absorb moisture.The coal drying upgrading of low metamorphic grade can be formed high heating value solid phase prod (solid phase prod) by this technology, generate the liquid product (liquid product) of high added value in addition.The solid phase prod calorific value height that the present invention forms, range of application is wide, and the liquid by-product of high added value is arranged simultaneously, has promoted the utility value of low rank coal significantly.Advantage of the present invention is to improve the calorific value of low rank coal, the technological process power consumption is little, overcome the conventional dehydration technology simultaneously owing to increasing the negative effect that calorific value brings, coal applied range through the present invention's processing, be difficult for the moisture absorption backwater after the Passivation Treatment, and generate with the byproduct of high added value.
Another one advantage of the present invention is the gradable use of fugitive constituent of separating out, and last waste gas is the low heat value burning gas, can be used as the drying of native system and the thermal source of pyrolysis installation.
Low rank coal upgrading technology of the present invention has following characteristics:
Technology of the present invention is heat drying, upgrading only, does not relate to the hydrogenation passivating process, need not consume a large amount of energy;
The present invention is processing treatment high-moisture, low-calorie low rank coal, can improve the low rank coal utility value greatly and utilize approach; The upgrading process is easy to control, and normal pressure, middle temperature only are heated to about 1000 centigradetemperatures; Water resources consumption is little; Product is stable, is difficult for spontaneous combustion, also can not absorb water, and can transport for long-distance.
Summary of the invention
The object of the present invention is to provide a kind of complete processing of low metamorphic grade coal.
Purpose of the present invention realizes in the following way, at first by pulverizing, the pretreated coal grain of screening of traditional way, carries out the following step successively:
1. drying step: will through pulverizing, the raw coal grain of the certain particle diameter of screening after handling send into moisture eliminator, carry out drying with weary oxygen hot gas under normal pressure.Can pulverize raw coal and control the coal grain granularity that enters moisture eliminator by crusher by sieving.Moisture eliminator can be a drying plant general in any industry, for example fluidized-bed, fixed bed, cylinder, rotary kiln etc.Particle diameter for the coal grain in this technology does not have special requirement, and generally the particle size range with the coal grain is controlled at 1mm between the 20cm, is preferably in 5mm between the 10cm, and this is the mode that generally adopts in the traditional technology.Oxygen level in the weary oxygen hot gas should be smaller or equal to 6% of volume.Drying conditions is controlled at per 1 kilogram of coal needs 10～50 cubic metres of hot gass, is preferably 10～20 cubic metres, guarantees that the temperature of raw coal grain is controlled at about 210～250 ℃, is preferably about 230 ℃, the most of moisture in the coal is removed guaranteeing.The hot gas that comes out from moisture eliminator can pass through dust removal process, can use any dust removal installation according to the band dust quantity in this process, and for example tornado dust collector, sack cleaner, electric precipitator etc. are preferably tornado dust collector.This hot gas can be by after the blower fan supercharging, returns moisture eliminator after the hot blast of coming in most of gas and the hot-air system mixes; Remaining a part of gas via the desulfurizer desulfurization after emptying.Desulfurizer can be selected any sweetening process as required for use.
2. upgrading step: will send into pyrolyzer through the raw coal grain that above-mentioned drying step is handled, throughput ratio with 1 kilogram of coal/10～50 cubic metre in pyrolyzer feeds high temperature oxygen deprivation hot gas, make raw coal grain and hot gas thorough mixing and be heated to 530～580 ℃, be preferably 540～550 ℃, make the raw coal grain that to a certain degree pyrolysis take place in pyrolyzer, its most of micromolecular fugitive constituent discharges, and most macromole fugitive constituent is fully activated, make the fugitive constituent in the coal finally be controlled between 16%～21%, calorific value and stability significantly improve, but can not become nonflammable.Wherein, pyrolyzer can be selected any general-purpose industrial pyrolysis oven as required for use, comprises successive and intermittently.In this technology, the temperature that strict control enters the oxygen deprivation hot gas of pyrolyzer is 400～950 ℃, and oxygen level is less than 6% of volume.Under these processing condition, do not produce any oxynitride.Coal solid after the upgrading enters next step product stabilizing step.The gas of separating out from pyrolyzer is the technology manufacture gas, carries out dedusting through fly-ash separator, enters condenser, is cooled to 100～170 ℃, is preferably 110～140 ℃.The liquid that condensation is got off directly enters the liquid product that the liquid product storage tank becomes high added value, after the condensation gas be in low-calorie fuel gas, can be used for power generation process, also can be used for the fuel feed of hot blast generation system.Wherein, can use any dust removal installation according to the band dust quantity in the dust removal process, for example tornado dust collector, sack cleaner, electric precipitator etc. are preferably tornado dust collector.Condenser can be selected any universal industrial condenser or particular design condenser as required for use.
The present invention can further include the product stabilizing step.In this processing step: after the coal solid phase prod leaves pyrolyzer, carry out quenching through quencher and handle, by adding the technology chilled water coal solid is cooled off rapidly therein, to stop pyrolytic reaction.The quenching air temperature ranges is 30～110 ℃, and the quenching temperature is controlled at per minute and descends 10 ℃ at least, and preferred per minute descends 30 ℃ at least, and most preferably per minute descends 50 ℃ at least.Finally make coal solid temperature drop to 170～210 ℃.The purpose of this step is the gasification reaction that stops in the pyrolytic process, makes the coal Pickering.Behind quenching, the coal solid enters the finished product reactor, feeds oxygen level therein and be 5%～22% air, and the passivation gas temperature is 120～150 ℃, makes coal solid reactive site that " oxidation passivation " reaction take place, and weakens its spontaneous combustion trend and moisture-absorption characteristics.After the oxidation passivation, can also in the finished product reactor, carry out rehydrated step, further stablize the coal solid phase prod.In rehydrated step, by in water cooler, adding a certain amount of moisture, make it to combine, so that the moisture content of solid phase prod reaches the ASTM equilibrium moisture content in the atmosphere with solid phase prod, solid is emitted heat and is made moisture evaporation when hydration, this is a rehydrated technology general in the prior art.The coal solid phase prod temperature of leaving this rehydrated step is 20～60 ℃, and water-content is 4%～10%.The coal solid phase prod of process finished product reactor is the solid phase prod behind final the stablizing, and wherein can further add dust-inhibitor, enters the solid phase prod warehouse then.The dust-inhibitor that is added can be sucrose or starchy material.
The complete processing of low metamorphic grade coal provided by the invention can further include the step that the technology manufacture gas enters the hot-air system recycling after having carried out above-mentioned drying, upgrading, product stabilizing step successively, it can be realized in the following way:
With 30%～60% pyrolyzer that directly returns in the upgrading step of the technology manufacture gas total amount that produced in the above-mentioned upgrading step, as the part of heating medium, for partial thermal decomposition provides heat; Remaining technology manufacture gas enters respectively in the pyrolysis and combustion device that added air and the drying and burning device and burns, and has consumed the oxygen that contains in the technology manufacture gas.For fear of generating a large amount of oxynitride, the hot gas temperature that the burning back is produced is controlled between 900～1100 ℃, is preferably 1000～1100 ℃, most preferably is 1050～1100 ℃.Leave the pyrolysis and combustion device, be consumed the hot gas of oxygen and the technology manufacture gas that directly returns pyrolyzer mixed after, become high temperature oxygen deprivation hot gas and enter in the pyrolyzer, for partial thermal decomposition provides heat; After leaving the hot gas drying and burning device, that be consumed oxygen and the cycling hot gas that leaves moisture eliminator mixing, become weary oxygen hot gas and enter in the moisture eliminator, for drying provides essential heat.The energy that is not enough to provide enough when the calorific value of industrial by-product gas can use additional fuel, as coal, Sweet natural gas, coal gas etc., to supply the deficiency of technology manufacture gas heat during for dry and pyrolysis.
The solid phase prod of producing by the present invention has environmental protection characteristic highly, at first, has significantly reduced the quantity discharged of oxynitride, and the nitrogen content in this solid phase prod obviously reduces than the nitrogen content in the low rank coal.Secondly, the total sulfur content in the solid phase prod reduces about 80% than the sulphur content in the raw coal, make it be discharged into the SO of big-and-middle gas after burning
2Content is wanted much less than former coal of direct burning, has reduced atmospheric pollution.Moreover, the total water content 5～8% in the solid phase prod reduces by 20～30% (deciding according to the low rank coal water content) than the content in the low rank coal.Calorific value is brought up to 5000～7000 kilocalories/kilogram, has improved equipment serviceability and incendiary thermo-efficiency, greatly reduces unit consumption and CO
2Discharging, reduced atmospheric pollution.
Description of drawings
By the illustrated detailed description to following this process, it is clearer that the feature of this invention will become.
Fig. 1 represents the process flow diagram of drying step of the present invention;
Fig. 2 represents the process flow diagram of upgrading step of the present invention;
Fig. 3 represents the process flow diagram of product stabilizing step of the present invention;
Fig. 4 represents the process flow diagram of hot-air system recycling.
Embodiment
With reference to legend, the same meaning of representing in its numeral and the accompanying drawing.
Fig. 1 represents the process flow diagram of drying step of the present invention.At first utilize pulverizer to pulverize raw coal, raw coal is sieved in advance by oscillating grid, input screening tower sieves then, removes excessive or too small coal cinder (grain).As shown in Figure 1, will send into fluidized bed dryer 2 through the raw coal grain 1 of pulverizing, sieve the certain particle diameter after handling, weary oxygen hot gas 13 heating of utilization are carried out drying to it under normal pressure and under the condition of strict control.Control the hot gas flow volume that per 1 kilogram of coal needs,, its most of moisture is removed and do not generate a large amount of gases such as methane to guarantee the temperature of control raw coal grain.Dried coal solid 10 enters the upgrading stage, and the hot gas flow 3 that comes out from moisture eliminator carries out dedusting through tornado dust collector 4.Hot gas 5 after the dedusting is by after blower fan 6 superchargings, returns moisture eliminator 2 after the hot gas 12 of coming in most of recycle gas 11 and the hot-air system mixes; Remaining a part of gas 7 via desulfurizer 8 desulfurization after emptying.
As shown in Figure 2, the coal solid 10 that leaves moisture eliminator 2 enters pyrolyzer 14, in pyrolyzer 14, feed high temperature oxygen deprivation hot gas 25 with certain throughput ratio, make coal and hot gas flow thorough mixing and be heated, and make coal that to a certain degree pyrolysis take place in pyrolyzer, its most of micromolecular fugitive constituent discharges, and most macromole volatile matter is fully activated.Under these processing condition, not only improved low rotten Chengdu burning of coal value and stability, and the solid product that it generated can not become nonflammable because of excessively separating out of volatile matter yet.The temperature and the oxygen level of strict control high temperature oxygen deprivation hot gas 25.The coal that leaves pyrolyzer 14 is the coal solid 24 after the upgrading, and calorific value and stability significantly improve, but can not become nonflammable.Coal solid 24 enters next step product stabilizing step.The gas 15 of separating out from pyrolyzer is the technology manufacture gas, carries out dedusting through tornado dust collector 16.Gas 17 after the dedusting enters condenser 18 then, temperature is cooled in condenser 18, the liquid 19 that condensation is got off is the liquid product of high added value, directly enter liquid product storage tank 20, gas 21 be in low-calorie technology by-product fuel gas, by the later technology by-product fuel gas 23 of blower fan 22 superchargings, can be used for power generation process or other fuel purposes, also can be used for the fuel feed of hot blast generation system.
As shown in Figure 3, after coal solid 24 leaves pyrolyzer, carry out quenching,, make the rapid cooling of coal solid quilt to stop pyrolytic reaction therein by adding quantitative technology chilled water through quencher 35.The temperature of control quenching temperature and coal.Coal solid 36 behind the quenching enters finished product reactor 37, therein by bubbling air 40, makes the reactive site of solid particulate that " oxidation passivation " reaction take place, and weakens its spontaneous combustion trend and moisture-absorption characteristics.In finished product reactor 37, also comprise rehydrated step simultaneously, further stablize the coal solid phase prod.Add moisture in water cooler, make it to combine with the coal solid phase prod, so that the moisture content of coal solid phase prod reaches the ASTM equilibrium moisture content in the atmosphere, this coal solid phase prod is the solid phase prod behind final the stablizing.After adding the starchy material dust-inhibitor, enter solid phase prod warehouse 39.
As shown in Figure 4,50% of technology manufacture gas 23 total amounts that produce in the upgrading step are the technology manufacture gas 32 that directly returns pyrolyzer 14, and it is as the part of heating medium, for pyrolysis provides heat; The part 28 of remaining technology manufacture gas 29 enters burning in the pyrolysis and combustion device 30, another part 27 enters burning in the drying and burning device 26, and in drying and burning device 26, add air 33, in pyrolysis and combustion device 30, add air 34, hot gas 12 and 31 temperature that control burning back is produced are to avoid generating a large amount of oxynitride.The hot gas 31 that leaves the pyrolysis and combustion device carries out mixed high temperature oxygen deprivation hot gas 25 with the technology manufacture gas 32 that directly returns pyrolyzer and enters in the pyrolyzer 14, for partial thermal decomposition provides heat; The hot gas 12 that leaves the drying and burning device enters moisture eliminator 2 with the circulation hot gas 11 mixed weary oxygen hot gass 13 that leave moisture eliminator 2, for drying provides essential heat.Add extra additional fuel 41, enter burner 26 and 30, to supply the deficiency of technology manufacture gas heat.
For more fully understanding the present invention, provide the complete processing embodiment of the low metamorphic grade coal that carries out according to the present invention below:
The raw coal grain is sent into moisture eliminator, and drying conditions is controlled at per 1 kilogram of coal needs 50 cubic metres of hot gass, and the oxygen level in the weary oxygen hot gas is 6.0% of a volume, guarantees that the temperature of raw coal grain is controlled at about 210 ℃.To send into pyrolyzer through the raw coal grain that above-mentioned drying process condition is handled, the throughput ratio with 50 cubic metres in 1 kilogram of coal in pyrolyzer feeds high temperature oxygen deprivation hot gas, and the temperature that control enters the oxygen deprivation hot gas of pyrolyzer is 400 ℃, and oxygen level is 2.5% of a volume.The technology manufacture gas of separating out from pyrolyzer through the tornado dust collector dedusting, enters condenser, is cooled to 110 ℃.Gained coal solid calorific value is 5100 kcal/kg.
The raw coal grain is sent into moisture eliminator, and drying conditions is controlled at per 1 kilogram of coal needs 40 cubic metres of hot gass, and the oxygen level in the weary oxygen hot gas is 4.5% of a volume, guarantees that the temperature of raw coal grain is controlled at about 230 ℃.To send into pyrolyzer through the raw coal grain that above-mentioned drying process condition is handled, the throughput ratio with 40 cubic metres in 1 kilogram of coal in pyrolyzer feeds high temperature oxygen deprivation hot gas, and the temperature that control enters the oxygen deprivation hot gas of pyrolyzer is 450 ℃, and oxygen level is 2.0% of a volume.The technology manufacture gas of separating out from pyrolyzer through the tornado dust collector dedusting, enters condenser, is cooled to 100 ℃.Gained coal solid calorific value is 5550 kcal/kg.
The raw coal grain is sent into moisture eliminator, and drying conditions is controlled at per 1 kilogram of coal needs 30 cubic metres of hot gass, and the oxygen level in the weary oxygen hot gas is 4.0% of a volume, guarantees that the temperature of raw coal grain is controlled at about 230 ℃.To send into pyrolyzer through the raw coal grain that above-mentioned drying process condition is handled, the throughput ratio with 10 cubic metres in 1 kilogram of coal in pyrolyzer feeds high temperature oxygen deprivation hot gas, and the temperature that control enters the oxygen deprivation hot gas of pyrolyzer is 550 ℃, and oxygen level is 1.5% of a volume.The technology manufacture gas of separating out from pyrolyzer through the tornado dust collector dedusting, enters condenser, is cooled to 130 ℃.Gained coal solid calorific value is 6550 kcal/kg.
The raw coal grain is sent into moisture eliminator, and drying conditions is controlled at per 1 kilogram of coal needs 20 cubic metres of hot gass, and the oxygen level in the weary oxygen hot gas is 3.5% of a volume, guarantees that the temperature of raw coal grain is controlled at about 240 ℃.To send into pyrolyzer through the raw coal grain that above-mentioned drying process condition is handled, the throughput ratio with 35 cubic metres in 1 kilogram of coal in pyrolyzer feeds high temperature oxygen deprivation hot gas, and the temperature that control enters the oxygen deprivation hot gas of pyrolyzer is 750 ℃, and oxygen level is 1.0% of a volume.The technology manufacture gas of separating out from pyrolyzer through the tornado dust collector dedusting, enters condenser, is cooled to 140 ℃.Gained coal solid calorific value is 6700 kcal/kg.
The raw coal grain is sent into moisture eliminator, and drying conditions is controlled at per 1 kilogram of coal needs 10 cubic metres of hot gass, and the oxygen level in the weary oxygen hot gas is 1.0% of a volume, guarantees that the temperature of raw coal grain is controlled at about 250 ℃.To send into pyrolyzer through the raw coal grain that above-mentioned drying process condition is handled, the throughput ratio with 30 cubic metres in 1 kilogram of coal in pyrolyzer feeds high temperature oxygen deprivation hot gas, and the temperature that control enters the oxygen deprivation hot gas of pyrolyzer is 950 ℃, and oxygen level is 0.5% of a volume.The technology manufacture gas of separating out from pyrolyzer through the tornado dust collector dedusting, enters condenser, is cooled to 170 ℃.Gained coal solid calorific value is 7100 kcal/kg.
Embodiment 6
The coal solid phase prod that to handle under the processing condition of embodiment 1 carries out quenching to be handled, and the quenching gas temperature is 110 ℃, and the quenching temperature is controlled at per minute and descends 10 ℃.Coal solid behind quenching enters the finished product reactor and carries out passivation reaction, and the passivation gas temperature is 120 ℃.
The coal solid phase prod that to handle under the processing condition of embodiment 2 carries out quenching to be handled, and the quenching gas temperature is 75 ℃, and the quenching temperature is controlled at per minute and descends 30 ℃.Coal solid behind quenching enters the finished product reactor and carries out passivation reaction, and the passivation gas temperature is 140 ℃.
The coal solid phase prod that to handle under the processing condition of embodiment 3 carries out quenching to be handled, and the quenching gas temperature is 65 ℃, and the quenching temperature is controlled at per minute and descends 50 ℃.Coal solid behind quenching enters the finished product reactor and carries out passivation reaction, and the passivation gas temperature is 150 ℃.
The coal solid phase prod that to handle under the processing condition of embodiment 4 carries out quenching to be handled, and the quenching gas temperature is 50 ℃, and the quenching temperature is controlled at per minute and descends 50 ℃.Coal solid behind quenching enters the finished product reactor and carries out passivation reaction, and the passivation gas temperature is 130 ℃.
The coal solid phase prod that to handle under the processing condition of embodiment 5 carries out quenching to be handled, and the quenching gas temperature is 30 ℃, and the quenching temperature is controlled at per minute and descends 80 ℃.Coal solid behind quenching enters the finished product reactor and carries out passivation reaction, and the passivation gas temperature is 140 ℃.
The industrial effect of the embodiment of the invention 6～10 below is provided, has contrasted from sulphur content, water content and the calorific value aspect thereof of the coal solid phase prod of last formation:
The industrial effect of table 1: embodiment 6～10
Claims (11)
1. the complete processing of a low metamorphic grade coal comprises pulverizing, screening pre-treatment, it is characterized in that also comprising the following steps:
(1). drying step: the raw coal grain is sent into moisture eliminator, lack oxygen hot gas drying under normal pressure, drying conditions is controlled at per 1 kilogram of coal needs 10～50 cubic metres of hot gass, and the temperature of raw coal grain is controlled at 210～250 ℃;
(2). upgrading step: the raw coal grain of above-mentioned steps is sent into pyrolyzer, throughput ratio with 1 kilogram of coal/5～50 cubic metre feeds high temperature oxygen deprivation hot gas, the temperature that control enters the oxygen deprivation hot gas of pyrolyzer is 400～950 ℃, oxygen level makes coal and hot gas thorough mixing and is heated to 530～580 ℃ less than 6% of volume;
(3). the product stabilizing step: the coal solid phase prod that will leave behind the pyrolyzer carries out quenching, and the quenching gas temperature is 30～110 ℃, and the quenching temperature is controlled to be per minute and descends 10 ℃ at least, finally makes the temperature of coal drop to 170～210 ℃; Coal solid behind the quenching enters the finished product reactor, feeds oxygen level and is 5%～22% air and carry out the oxidation passivation reaction, and the passivation gas temperature is 120～150 ℃.
2. the complete processing of low metamorphic grade coal as claimed in claim 1 is characterized in that also comprising that the technology manufacture gas enters the step of utilizing of hot-air system recirculation, in this step:
30%～60% pyrolyzer recycle of directly returning in the upgrading step with the technology manufacture gas total amount that produces in the upgrading step; Remaining technology manufacture gas enters respectively in pyrolysis and combustion device and the drying and burning device and burns, and the hot gas temperature that is produced is controlled between 900～1100 ℃; Enter the pyrolyzer recycle after leaving the hot gas of pyrolysis and combustion device and the technology manufacture gas that directly returns pyrolyzer mixing; The hot gas that leaves the drying and burning device with enter the moisture eliminator recycle after the circulation hot gas that leaves moisture eliminator mixes.
3. the complete processing of low metamorphic grade coal as claimed in claim 1 or 2 is characterized in that described drying step also comprises dedusting and sweetening process.
4. the complete processing of low metamorphic grade coal as claimed in claim 1 or 2 is characterized in that described drying conditions is controlled at 10～20 cubic metres of hot gass of per 1 kilogram of coal needs.
5. the complete processing of low metamorphic grade coal as claimed in claim 1 is characterized in that in the described product stabilizing step, and the quenching temperature is controlled at per minute and descends 30 ℃ at least.
6. the complete processing of low metamorphic grade coal as claimed in claim 5 is characterized in that described quenching temperature is controlled at per minute and descends 50 ℃ at least.
7. the complete processing of low metamorphic grade coal as claimed in claim 1 is characterized in that also carrying out rehydrated step in the finished product reactor.
8. the complete processing of low metamorphic grade coal as claimed in claim 7 is characterized in that after rehydrated step, and the coal solid water-content after gained is stable is 4%～10% of a weight ratio.
9. the complete processing of low metamorphic grade coal as claimed in claim 1 is characterized in that adding dust-inhibitor in the coal solid phase prod through the finished product reactor.
10. the complete processing of low metamorphic grade coal as claimed in claim 2 is characterized in that described technology manufacture gas enters respectively in pyrolysis and combustion device and the drying and burning device after the burning, and the hot gas temperature that is produced is controlled between 1000～1100 ℃.
11. the complete processing of low metamorphic grade coal as claimed in claim 10 is characterized in that the hot gas temperature that is produced is controlled between 1050～1100 ℃.
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| CN1066459A (en) * | 1992-06-13 | 1992-11-25 | 煤炭科学研究总院北京煤化学研究所 | A kind of process of coal pyrogenic decomposition of multi-stage rotary |
| CN101063051A (en) * | 2006-04-26 | 2007-10-31 | 董久明 | Powder coal grading cleaning multigang utilization system |
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2007
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066459A (en) * | 1992-06-13 | 1992-11-25 | 煤炭科学研究总院北京煤化学研究所 | A kind of process of coal pyrogenic decomposition of multi-stage rotary |
| CN101063051A (en) * | 2006-04-26 | 2007-10-31 | 董久明 | Powder coal grading cleaning multigang utilization system |
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