CN101805628B - Process method and device for transformation and quality improvement of low-rank coal - Google Patents
Process method and device for transformation and quality improvement of low-rank coal Download PDFInfo
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- CN101805628B CN101805628B CN200910009098A CN200910009098A CN101805628B CN 101805628 B CN101805628 B CN 101805628B CN 200910009098 A CN200910009098 A CN 200910009098A CN 200910009098 A CN200910009098 A CN 200910009098A CN 101805628 B CN101805628 B CN 101805628B
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Abstract
The invention provides process method and device for the transformation and quality improvement of low-rank coal. The process method comprises the following steps of: drying the low-rank coals in a drying device by utilizing hypoxic gas supplied by a first combustion chamber; pyrolyzing the dried low-rank coals input in a pyrolysis device by utilizing the hypoxic gas supplied by a second combustion chamber; separating the pyrolysis gas generated by the pyrolysis device; and respectively transporting combustible gas obtained by separating the pyrolysis gas to the first combustion chamber and the second combustion chamber to be used as combustion gas for recycle. In the device, a combustion device respectively supplies the hypoxic gas to the drying device and the pyrolysis device through the first combustion chamber and the second combustion chamber which are mutually independent; the combustible gas obtained by separating the pyrolysis gas is respectively transported to the first combustion chamber and the second combustion chamber to be cycled as the combustion gas. The invention lowers the energy consumption, effectively controls local combustion and temperature in the drying device and the pyrolysis device and reduces the environmental pollution.
Description
Technical field
The present invention relates to a kind of transformation and quality improvement of low-rank coal process method and device, relate to the process method and the device that can recycle by-product fuel gas in the transformation and quality improvement of low-rank coal process particularly.
Background technology
The reserves of low-rank coal account for the total reserves of coal resources in China about 15%, are a kind of of China's main coal resource.The distribution of low-rank coal is more concentrated, mainly be distributed in ground such as the Inner Mongol and Xinjiang, but these local Economic developments is relatively backward basically, therefore need coal resources be transported to the reasonable place of economic development relatively.Because such coal, its water cut is high and be easy to spontaneous combustion, therefore need low-rank coal drying and mild-gasification be handled in the locality, to improve the utilization ratio of railway.
Up to the present various countries have two kinds to the main methods of low-rank coal upgrading, and one of which is that low-rank coal is dry, has reduced the moisture in the coal like this, have reduced the heat that low-rank coal consumes owing to the aqueous vapor evaporation in combustion processes; It two is exactly the mild-gasification of low-rank coal, with low-rank coal under anoxybiotic atmosphere mild-gasification with low-rank coal in the fuel value low-volatile extract, improve unit burning of coal value like this.
Have two types for the existing technology of the gasification of low-rank coal: one, solid phase thermal barrier technology, such technology mainly are that the fugitive constituent that is used in the extracting coal is produced various chemical fundamentals raw materials, after the gasification semicoke product that generates are burnt the heat hot carrier; Two, gas phase thermal barrier technology, this process are that the gas that gasification is produced is burnt, and improve the temperature of gas phase carrier, with being applied to generate electricity after the carbonization at low temperature product cooling that is produced and other energy conversion process.
Upgrading for low-rank coal is the focus of studying both at home and abroad always; For different countries and different service conditions; People have proposed various technological process, the low temperature pyrogenation technology of L-S of Germany for example, the solid thermal carriers technology and the Japanese coal fast pyrolysis technology of the FSU.China also has many postgraduates and unit to carry out the research of this respect, and still sophisticated can industrialized technology still be fewer.Tsing-Hua University has proposed a kind of brown coal drying and upgrading process method in the patent CN101260307A of application on April 28th, 2008; Adopt the portion water steam that brown coal drying is handled; Replace all using the method for anoxic property gas, the local spontaneous combustion of control low-rank coal in dry and pyrolytic process is though can reduce the danger of the spontaneous combustion of brown coal in drying process like this; But this has increased the complicacy of technological process; Promptly increased the generating unit of steam, and in the generating process of steam, have the part the high-temp combustion process will generate a large amount of oxynitride, can certain pollution not arranged to environment like this if do not add processing.
Summary of the invention
The invention provides a kind of process method and device of transformation and quality improvement of low-rank coal; Through recycling by-product fuel gas; Greatly reduce energy expenditure in the transformation and quality improvement of low-rank coal technological process, effectively controlled the partial combustion in drying installation and the pyrolysis installation, simplified the temperature control of drying installation and pyrolysis installation; And reduced pollution to environment, reduced the technology cost.
The present invention realizes above-mentioned purpose through following technical scheme: a kind of process method that recycles by-product fuel gas in the transformation and quality improvement of low-rank coal process may further comprise the steps: the anoxic property gas that utilizes first combustion chamber to provide carries out drying to the low-rank coal in the drying installation; The anoxic property gas that utilizes second combustion chamber to provide carries out pyrolysis to the dried low-rank coal in the input pyrolysis installation; The pyrolysis gas that said pyrolysis installation is produced carries out separating treatment; And will separate that the inflammable gas that obtains be transported to said first combustion chamber respectively and said second combustion chamber recycles as combustion gases from said pyrolysis gas.
Also comprise controllably auxiliary fuel gas being provided, so that the anoxic property gas that said first combustion chamber and second combustion chamber provide meets preset temp to said first combustion chamber and said second combustion chamber.
Also comprise controllably to said first combustion chamber and the said second combustion chamber input air, be lower than 1% so that the oxygen concentration of the anoxic property gas that said first combustion chamber is provided is lower than the oxygen concentration of the anoxic property gas that 3% and second combustion chamber provided.
The flammable low hydrocarbon gas that this technological cycle has used coal cracking to generate.With pyrogenous origin inflammable gas respectively and air, auxiliary fuel gas mixes and is passed in each combustion chamber, and burning generates a large amount of anoxic property high-temperature gases.
Regulate hydrocarbon content from the inflammable gas that said pyrolysis gas separation obtains through the temperature of control separating treatment.
Part is mixed into the anoxic property gas of said second combustion chamber generation from the inflammable gas that said pyrolysis gas separation obtains, so that the anoxic property gas that said second combustion chamber produces meets preset temp.
The gas that obtains after the mixed gas separation with the said drying installation generation of part is mixed in the anoxic property gas of said first combustion chamber generation, so that the anoxic property gas that said first combustion chamber produces meets preset temp.
This technological process is regulated air through the temperature of the products of combustion of two combustion chambers of monitoring, and the temperature of auxiliary fuel gas and condensing surface makes this stable technical process move.Reduce the generation of unmanageable oxynitrides through the temperature of strictness control combustion chamber, and reduce pollution environment through the treatment unit of tail gas.
Comprise that also the mixed gas that said drying installation is produced carries out the separating treatment of solid and gas, the gas that then separation is obtained carries out discharging after the vent gas treatment.
Before implementing said process method, utilize said first combustion chamber of inert gas purge, said second combustion chamber, said drying installation and said pyrolysis installation.
The present invention also provides a kind of transformation and quality improvement of low-rank coal device; Comprise combustion unit, drying installation and pyrolysis installation; Said combustion unit difference gas communication is in said drying installation and said pyrolysis installation; Said drying installation is connected in said pyrolysis installation through e Foerderanlage; Said combustion unit comprises independently first combustion chamber and second combustion chamber, and said first combustion chamber and said second combustion chamber difference gas communication are in said drying installation and said pyrolysis installation, to the two anoxic property gas to be provided respectively; Said pyrolysis installation also gas communication is used for pyrolysis gas is separated into solid phase prod and inflammable gas in separating and treating apparatus; Said separating and treating apparatus gas communication recycles as combustion gases said inflammable gas is transported to said first combustion chamber and second combustion chamber respectively in said first combustion chamber and second combustion chamber.
The invention belongs to the gas phase thermal barrier technology course of processing, but a large amount of anoxic property gas of this process need, and the low hydrocarbon gas that therefore recycles the technological process generation is the unique economically viable method that addresses this problem.The present invention adopts two combustion chambers to come the fuel gas of burning process by-product, supplies the drying and the pyrolytic process of low-rank coal respectively, makes whole technological process be easy to control like this, and has improved the flexibility of this technological process to various different properties low-rank coal.Through strict control air, auxiliary fuel gas and technology by-product flow fuel, concentration of oxygen is lower than 1% in the generation high temperature anoxic property gas that makes it to burn, and can suppress the spontaneous combustion in dry and pyrolytic process of low-rank coal like this.In addition, the temperature of strict control combustion chamber reduces the generation of oxynitride, and before gaseous emission, has increased the treatment process of gas in combustion processes, makes and unburned hydrocarbon gas perfect combustion reduces the pollution to environment.
The present invention controls the possibility of the spontaneous combustion of low-rank coal drying and pyrolytic process through concentration of oxygen in the high temperature anoxic property gas that produces in the strictness control combustion processes; Temperature through the control combustion chamber makes it under the temperature that is lower than a large amount of oxynitride of generation, to burn, and reduces the influence to environment like this.
The present invention produces dry and the required a large amount of anoxic property gases of pyrolysis processing through the fuel gas that recycles the technology by-product; Make the process for upgrading of the low-rank coal economically feasible that becomes; Through using two combustion chambers respectively dry and a large amount of oxygen content of pyrolysis supply to be lower than 3% and 1% process gas; Make this technology be easy to control like this and lower to the selectivity ratios of coal, the operation stability of technology improves greatly.This technology is coagulated the temperature of gas-liquid separator through control pyrolysis air cooling; Come the content of the middle hydro carbons of CONTROL PROCESS by-product fuel gas; Thereby control the temperature of the chamber temperature and the high temperature anoxic property gas of burning generation, make the steady running in certain balancing run scope of whole technology.In sum, technological process of the present invention is a kind of economically feasible, is easy to industrialized best process flow.
Description of drawings
Fig. 1 is the structure and the process flow diagram of transformation and quality improvement of low-rank coal device of the present invention.
Embodiment
Specify the present invention with reference to the accompanying drawings.
Fig. 1 is the structure and the process flow diagram of transformation and quality improvement of low-rank coal device of the present invention, specifies the present invention below in conjunction with Fig. 1.The parameter that does not provide all devices among the figure; Can select general chemical equipment general on the present market just can satisfy fully according to different production amount and production requirement, can be solid phase processing reactors such as rotary kiln, shaft furnace, fluidized-bed and fixed bed as for pyrolysis installation and two equipment of drying installation.
Be illustrated in figure 1 as the embodiment of a kind of transformation and quality improvement of low-rank coal device of the present invention; Mainly comprise independent first combustion chamber 1 and second combustion chamber 2 that is provided with; Drying installation 10 and pyrolysis installation 9, the first combustion chambers 1 gas communication in drying installation 10, the second combustion chambers 2 gas communications in pyrolysis installation 9; To the two anoxic property gas 22 being provided respectively, thereby low-rank coal is carried out drying and pyrolysis.Drying installation 10 is connected in pyrolysis installation 9 through the e Foerderanlage (not shown), carries out pyrolysis in the pyrolysis installation 9 so that dried low-rank coal is transported to.Pyrolysis installation 9 produces fixed product 20 and pyrolysis gas 12, and pyrolysis installation 9 is gone back gas communication in cyclonic separator 4, pyrolysis gas 12 is separated into solid phase prod 8 and gas 7.The air outlet of cyclonic separator 4 is communicated in condensing air liquid/gas separator 6, gas 7 is separated into liquid product 5 and low hydrocarbon fuel gas 18.Condensing air liquid/gas separator 6 gas communications are in first combustion chamber 1 and second combustion chamber 2, and hydrocarbon fuel gas 18 will be transported to first combustion chamber 1 respectively and second combustion chamber 2 recycles as combustion gases hanging down.Drying installation 10 is gone back gas communication in cyclonic separator 21; So that the water vapour that produces in the drying process and the mixture 14 of the low hydrocarbon gas of part are isolated solid phase prod 17 and waste gas 15; The air outlet of cyclonic separator 21 also is connected in exhaust gas treating device 16; With with gas 15 discharging more after treatment, pollute to reduce.
Preferably; First combustion chamber 1 and second combustion chamber 2 also are respectively equipped with gas inlet 3 and auxiliary fuel gas inlet 25; Ratio through fuel metering gas 18, air and auxiliary fuel gas; So that the oxygen content of the anoxic property gas that first combustion chamber and second combustion chamber provide is lower than 5%, obtain enough heat energy to guarantee drying installation and pyrolysis installation.
Still combine Fig. 1 that the process method of transformation and quality improvement of low-rank coal of the present invention is described below.
At first, the oxygen content that utilizes first combustion chamber 1 to provide is lower than 3% anoxic property gas the low-rank coal in the drying installation 10 is carried out drying; The oxygen content that utilizes second combustion chamber 2 to provide is lower than 1% anoxic property gas the dried low-rank coal from drying installation 10 input pyrolysis installations 9 is carried out pyrolysis; Then; The pyrolysis gas that said pyrolysis installation 9 is produced carries out separating treatment; Separating treatment divided for two steps carried out, and a step is to utilize cyclonic separator 4 that pyrolysis gas is separated into solid phase prod 8 and gas 7, is tar owing to contain a certain amount of high boiling organism in the gas 7; Therefore also need another step separating treatment, promptly utilize phlegma gas separating device 6 that gas 7 further is separated into liquid product 5 and low hydrocarbon fuel gas 18; To hang down at last that hydrocarbon fuel gas 18 is transported to first combustion chamber 1 respectively and second combustion chamber 2 recycles as combustion gases.
Because the fuel value of the low hydrocarbon fuel gas 18 that is produced in the technological process of the present invention is along with different treatment condition are can be reformed; Therefore need certain auxiliary fuel gas to regulate temperature of combustion, guarantee that drying installation and pyrolysis installation have enough heat energy to come dry and pyrolysis low-rank coal.Therefore preferably, controllably auxiliary fuel gas is provided, so that this anoxic property gas meets preset temp to first combustion chamber and second combustion chamber.
Because the volatile content of low-rank coal is than higher; In the process of depth drying, be easy to generate the phenomenon of partial combustion; Therefore must before production, oxygen all in the equipment be got rid of; Can clean whole technological process through using rare gas element, promptly use inert gas purge first combustion chamber, second combustion chamber, drying installation and pyrolysis installation etc.; And must guarantee that in the process of driving the burning that carry out two combustion chambers is abundant burning, promptly control fuel and the mass ratio of air in the anoxic property gas of gained.This requirement is strict control supporting process in process of combustion chamber igniting, and the temperature of the high temperature anoxic property gas of the generation of need will burning remains on 500-1100 ℃, can adjust this temperature according to the different physics and the chemical property of the low-rank coal of handling.
Low-rank coal obtains semicoke solid phase prod and pyrolysis gas 12 after through pyrolysis reactor 9 thermal treatments; Pyrolysis gas 12 contains a large amount of low appropriate hydrocarbon gas; Can produce the different low hydrocarbon pyrolysis gas of forming 12 through regulating different pyrolysis temperatures, pyrolysis gas 12 is separated dust and gas delivery through cyclonic separator, obtain solid phase prod 8 and gas 7; Because containing a certain amount of high boiling organism in the gas 7 is tar; Need separate through phlegma gas separating device 6, can obtain liquid prod 5 like this and can be used for the low hydrocarbon fuel gas 18 of incendiary.
Therefore regulate air, auxiliary fuel gas and import first combustion chamber 1 and the flow of the low hydrocarbon fuel gas 18 of second combustion chamber 2 through the temperature and the concentration of oxygen of monitoring combustion chamber.Wherein auxiliary fuel gas can be any energy-producing gas, for example any or multiple mixture of blast furnace gas, Sweet natural gas or coke-oven gas of burning.If required auxiliary fuel gas is higher than the demand of setting, can improve the hydrocarbon content of process gas 18 through the temperature that improves phlegma gas separating device 6, so just can reduce the consumption of auxiliary fuel gas, make it to reach the pre-conditioned of technology.If the temperature of the high temperature anoxic property gas that obtains is higher than preset temp; The waste gas 15 that obtains after can the mixed gas of the said drying installation generation of low hydrocarbon fuel gas 18 of part and part being separated is mixed into the temperature of immediately reduce the high temperature anoxic property gas that each combustion chamber provides in the anoxic property gas that first combustion chamber and second combustion chamber provide respectively; Reduce the hydrocarbon content of low hydrocarbon fuel gas 18 simultaneously through the temperature that reduces condensing surface 6, thereby reduce the temperature of combustion chamber.The flow of the air of in whole regulate process, importing through gas inlet 3 also should be done corresponding adjustment, so that oxygen concentration meets each segment process requirement in the anoxic property gas that feasible burning obtains.The temperature of different condensing air liquid/gas separators 6 can produce the low hydrocarbon fuel gas 18 and different concentration of oxygen of different fuel values, and along with the rising of temperature, the fuel value of low hydrocarbon fuel gas 18 raises concentration of oxygen reduction gradually gradually.
The present invention is the mixture 14 of the water vapour that produces in the drying process with the low hydrocarbon gas of part, through cyclonic separator 21, the solid dust removed obtain solid phase prod 17; And obtained 120-300 ℃ low temperature waste gas 15; Contain the sulfur oxide that combustion processes generates in this gas, a spot of flammable toxic gas such as the methane that generate in the drying process, carbon monoxide and hydrogen etc.; These gases must pass through exhaust gas treating device 16 and handle, to satisfy the emission standard of environment.Exhaust gas treating device 16 is some conventional tail gas treatment process, and its device is exactly commercially available conventional equipment.In addition; Temperature through aforesaid method strict each combustion chamber of control in the process of producing is not higher than certain temperature; Promptly be not higher than 1200 ℃, can avoid the generation of a large amount of oxynitride like this, will simplify the technological process of exhaust gas treating device 16 so greatly.
In order to further specify the present invention, a specific embodiment below combining is explained technological process of the present invention and process control parameter.According to technology of the present invention, its throughput is 200kg/h.Table one has provided the characteristics of the Inner Mongol shungite of handling and the character of the coal that after super-dry and pyrolysis processing, obtains respectively.
Table one
In the process of producing; Auxiliary fuel, air and technology by-product hang down hydrocarbon fuel gas 18; After second combustion chambers burn and with the low hydrocarbon fuel gas 18 of part technology by-product, mixes to generate and be used for pyrolytic high-temperature gas mixture body 11, wherein the low hydrocarbon fuel gas 18 of technology by-product is listed in respectively in the table two and three with the composition and the flow of the high-temperature gas mixture body 11 of generation:
Table two
Table three
The low hydrocarbon fuel gas 18 of technology by-product that is used for first combustion chamber is identical with the composition of the high temperature oxygen-depleted gas of first combustion chamber to be seen and passes through table two composition and the temperature of the high temperature anoxic property gas 22 that after first combustion chambers burn, generates and see table four
Table four
Low-rank coal is in drying installation; After high-temperature gas mixture body 13 dryings, the mixture 14 of water vapour that has generated and the low hydrocarbon gas of part, the composition of wherein mixture as shown in the figure 14, waste gas 15 is identical; But flow is different, and the composition and the temperature of mixture 14 are listed in table five; The anoxic property gas 22 that first combustion chamber generates is out listed in table six with temperature and composition that part waste gas 15 mixes the mixed gas 13 of back generation:
Table five
Table six
After mixed gas 11 got into pyrolytic reaction, the composition and the temperature of the pyrolysis gas 12 of generation were listed in the table seven:
Table seven
Through foregoing description, can find out the present invention compared with prior art, mainly solved following technical problem:
1, the production of the anoxic property gas of pyrolysis and dry required great amount of high-temperature
This invention has recycled the hydrocarbon gas of the technology by-product that the gasification of technological process mild or moderate produced; Reduce energy expenditure in the whole technological process so greatly; And reduced methane; The discharging of carbon monoxide and low hydro carbons toxic gas, the inflammable gas that is produced in technological process completely consumed basically, this just reduces the storage of worker's coal gas and the investment of devices that transports greatly.
2, the partial combustion of low-rank coal in drying and pyrolytic process
The control that this invention is strict get into the ratio of combustion chamber air and fuel gas; Make fuel gas that burning fully take place; Drying process uses the content of the oxygen of anoxic property gas to be lower than 3% in the feasible high-temperature gas that is produced, and pyrogenic processes uses the content of the oxygen of anoxic property gas to be lower than 1%, if can cause partial combustion in kiln and the pyrolysis reactor because concentration of oxygen is higher than this value; Reduce the efficient of reactor drum, and be that whole technological operation is unstable.
3, drying and pyrolytic temperature controlling in the technological process have been simplified
This invention adopts two combustion chambers to come the coal gas in the burning process process; And the process gas that is produced is applied to dry and two reactor drums of pyrolysis respectively; Simplify the control of two temperature of reactor so greatly, helped the control of technological process and the flexibility of technological process.
4, in low-rank coal drying and the mild-gasification process to the pollution of environment
Temperature through pyrolysis gas in the circulating combustion gasification and strict control combustion chamber suppresses the generation of oxynitrides, and before process gas emptying, will carry out the emission standard that gas processing makes it to reach environment.
Claims (7)
1. the process method of a transformation and quality improvement of low-rank coal is characterized in that, may further comprise the steps:
The anoxic property gas that utilizes first combustion chamber to provide carries out drying to the low-rank coal in the drying installation; The anoxic property gas that utilizes second combustion chamber to provide carries out pyrolysis to the dried low-rank coal in the input pyrolysis installation; Wherein, Controllably to said first combustion chamber and the said second combustion chamber input air,, the oxygen concentration of the anoxic property gas that said first combustion chamber is provided is lower than 1% weight so that being lower than the oxygen concentration of the anoxic property gas that 3% weight and said second combustion chamber provided;
The pyrolysis gas that said pyrolysis installation is produced carries out separating treatment; And
To separate that the inflammable gas that obtains be transported to said first combustion chamber respectively and said second combustion chamber recycles as combustion gases from said pyrolysis gas.
2. the process method of transformation and quality improvement of low-rank coal as claimed in claim 1; It is characterized in that; Also comprise controllably auxiliary fuel gas being provided, so that the anoxic property gas that said first combustion chamber and second combustion chamber provide meets preset temp to said first combustion chamber and said second combustion chamber.
3. the process method of transformation and quality improvement of low-rank coal as claimed in claim 1 is characterized in that, regulates from said pyrolysis gas through the temperature of control separating treatment and separates hydrocarbon content the inflammable gas that obtains.
4. the process method of transformation and quality improvement of low-rank coal as claimed in claim 3; It is characterized in that; Part is mixed into the anoxic property gas of said second combustion chamber generation from the inflammable gas that said pyrolysis gas separation obtains, so that the anoxic property gas that said second combustion chamber produces meets preset temp.
5. the process method of transformation and quality improvement of low-rank coal as claimed in claim 4; It is characterized in that; The gas that obtains after the mixed gas separation with the said drying installation generation of part is mixed in the anoxic property gas of said first combustion chamber generation, so that the anoxic property gas that said first combustion chamber produces meets preset temp.
6. the process method of transformation and quality improvement of low-rank coal as claimed in claim 5 is characterized in that, comprises that also the mixed gas that said drying installation is produced carries out the separating treatment of solid and gas, and the gas that then separation is obtained carries out discharging after the vent gas treatment.
7. the process method of transformation and quality improvement of low-rank coal as claimed in claim 1 is characterized in that, before implementing said process method, utilizes said first combustion chamber of inert gas purge, said second combustion chamber, said drying installation and said pyrolysis installation.
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| US8968520B2 (en) * | 2011-06-03 | 2015-03-03 | National Institute Of Clean And Low-Carbon Energy (Nice) | Coal processing to upgrade low rank coal having low oil content |
| FI9406U1 (en) * | 2011-06-15 | 2011-10-11 | Outotec Oyj | Apparatus for making ore concentrate for pelleting |
| US9074138B2 (en) * | 2011-09-13 | 2015-07-07 | C2O Technologies, Llc | Process for treating coal using multiple dual zone steps |
| CN102517056B (en) * | 2011-12-07 | 2014-02-12 | 黄冈市中洲安达热工设备有限公司 | Self-supplied heat source type of brown coal drying destructive distillation upgrading equipment |
| CN102994126B (en) * | 2012-10-11 | 2014-07-16 | 田原宇 | Pyrolysis upgrading equipment of downward circulating fluidized bed for low-rank coal |
| CN102911685A (en) * | 2012-11-02 | 2013-02-06 | 中国林业科学研究院林产化学工业研究所 | Technology and equipment used for utilizing latent heat in tail gas during process of biomass molding carbon preparation |
| CN103409152A (en) * | 2013-07-26 | 2013-11-27 | 中国五环工程有限公司 | Technology and system for upgrading low-rank coal through high-heating-value gas heat carrier |
| CN105258454A (en) * | 2015-10-16 | 2016-01-20 | 北京神雾环境能源科技集团股份有限公司 | Drying method for lignite |
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| US5505144A (en) * | 1992-01-29 | 1996-04-09 | Ormat, Inc. | Method of and means for producing combustible gases from low grade solid fuel |
| CN101260307A (en) * | 2008-04-18 | 2008-09-10 | 清华大学 | Brown coal drying quality-increasing device and technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5505144A (en) * | 1992-01-29 | 1996-04-09 | Ormat, Inc. | Method of and means for producing combustible gases from low grade solid fuel |
| CN101260307A (en) * | 2008-04-18 | 2008-09-10 | 清华大学 | Brown coal drying quality-increasing device and technique |
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