CN102250633A - Method for improving quality of brown coal with externally heated rotary furnace - Google Patents
Method for improving quality of brown coal with externally heated rotary furnace Download PDFInfo
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- CN102250633A CN102250633A CN2011101615211A CN201110161521A CN102250633A CN 102250633 A CN102250633 A CN 102250633A CN 2011101615211 A CN2011101615211 A CN 2011101615211A CN 201110161521 A CN201110161521 A CN 201110161521A CN 102250633 A CN102250633 A CN 102250633A
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Abstract
The invention provides a method for improving quality of brown coals with an externally heated rotary furnace. The method comprises the following steps: drying and desorbing a raw material brown coals at a temperature of 100 DEG C to 300 DEG C in a rotary drying furnace; thermally cracking the dried and desorbed brown coals in a rotary carbonization furnace; heating and keeping the brown coals at a temperature of 450 to 700 DEG C through hot air from an outer jacket for thermal cracking for 40 min to 2 h; as for semi coke obtained after thermal cracking, quenching the resultant semi coke in a rotary cooling furnace and allowing the semi coke to pass through a screening device so as to obtain a finished product of semi coke with different particle sizes; as for high temperature crude coal gas containing tar obtained after thermal cracking, allowing the resultant high temperature crude coal gas containing tar to pass through a tar separating and purifying device so as to obtain a finished product of tar with high quality and a finished product of coal gas with a high calorific value, delivering one part of the finished product of coal gas and air into a combustion furnace for combustion, and delivering the combusted hot flue gas back to the jacket of the rotary carbonization furnace as a heat source. The invention enables the utilization rate of the raw material brown coals and the available value of the coal gas to be improved and treating capacity of a purifying device for coal gas to be reduced; dry quenching of coke is employed and the discharge of the coke is continuous, thereby improving the quality of semi-coke, saving energy and reducing generation of harmful gas.
Description
Technical field
The present invention relates to the new technology of preparing of a kind of industrialization brown coal upgrading, particularly a kind of industrialization process technology and equipment thereof with rotary kiln drying and upgrading brown coal, it belongs to technical field of coal chemical industry.
Background technology
China is the country that takes the primary energy source resource with coal as the leading factor, and coal can provide the primary energy source more than 65%, and coal production occupies first place in the world, and increases year by year.The coal resources workable reserve of China occupies the third place in the world, accounts for 11.5% of world's total reserves.Wherein the brown coal reserves account for 16% of world's brown coal total reserves.Along with to the continuous increase of energy demand with to the overexploitation of bituminous coal, anthracite resource, China will be more and more important to the development and utilization of brown coal.Compare with bituminous coal, hard coal, the advantage of brown coal is that price is lower, the reactive behavior height, but its calorific value is relatively low, and water content is higher, is generally 25-60%, easy-weathering and spontaneous combustion, the transportation cost height of unit energy is unfavorable for long distance conveying and storage.The direct incendiary thermo-efficiency of brown coal is lower, and the quantity discharged of greenhouse gases is also very big, is difficult to large-scale develop and utilize.In addition, utilization also is restricted brown coal as feedstock conversion, and brown coal liquefaction, destructive distillation and gasification all need moisture in coal is reduced to below 10%.If brown coal will be difficult to satisfy multiple user's specification of quality without upgrading processing.Therefore brown coal are carried out drying and upgrading, have great importance for the efficient utilization of brown coal.
In recent years, domestic brown coal upgrading Study on Technology has had significant progress, also has a certain distance but compare with foreign technology.Generally adopt the predrying or water vapour drying process of flue gas that brown coal are carried out drying at present abroad, directly deliver near coal-mine power plant then and be used for combustion power generation.With external different be, the near coal-mine power plant of China quantity is few, and most of power plant is away from the colliery.Therefore need could arrive the coal-burning power plant through long-distance transport after the exploitation of the coal resources of China, the Coal Transport radius is bigger, and this development and utilization to lignite resource is had higher requirement.Consider that from transportation cost and combustion heat value aspect brown coal need just can be transported to the user behind drying and upgrading.The existing brown coal drying and upgrading technology many places of China are in the scale demonstration phase, and the steady running problem is the one of the main reasons that these process scale of puzzlement are used.From brown coal drying and upgrading The Application of Technology situation, still lack all perfect technology and the technology in aspect such as engineering application and economy at present.Therefore, can maximize, execute-in-place efficient brown coal drying and upgrading technology simple, stable performance is the main direction of research and development always.
Summary of the invention
The purpose of this invention is to provide a kind of method of carrying out the brown coal upgrading with the external-heating revolving stove, described technology can industrial large-sizedization, the continous-stable long-play; Semicoke output is big, efficient is high, economic benefit is obvious.Technological process does not have waste gas, waste water, waste sludge discharge, and by-product gas impurity is few, the high material gas that can be used as of calorific value, belongs to environmental protection comprehensive utilization project.
For achieving the above object, technical scheme of the present invention is as follows: a kind of method of carrying out the brown coal upgrading with the external-heating revolving stove may further comprise the steps:
(1) the raw material brown coal is sent into the rotary drying stove, make raw material brown coal temperature under 100～300 ℃ environment, carry out drying and take off and inhaled 20～40 minutes, remove the moisture content in the brown coal and be adsorbed on gas in the pore of coal;
(2) coal dry and that take off after the suction enters revolution charring furnace pyrolysis upgrading, in 450～700 ℃ of following thermo-cracking 40min～2 of temperature of charge hour, obtain semicoke and the high temperature rough gas that contains tar after the thermo-cracking upgrading, the working pressure of revolution charring furnace is between pressure-fired and little negative pressure, and concrete numerical value is ± 500mmH
2O, this force value is to test the experience gained according to the present invention, can not judge with the sensu lato pressure of chemical industry;
(3) discharged by revolution charring furnace stove tail by the semicoke that produces after the thermo-cracking upgrading, send into revolution cool furnace quenching cooling, cooled semicoke is sent into the finished product semicoke that the screening of sieve coke installation obtains different-grain diameter again;
(4) derive by revolution charring furnace airway by the high temperature rough gas that contains tar that produces after the thermo-cracking upgrading, enter tar coal gas separation and purification device, absorb and purifying, obtain high-quality tar finished product and high heating value gas finished product; Wherein a part of finished product coal gas and air are sent into the roasting kiln burning, hot flue gas after the burning is sent in the revolution charring furnace chuck as the thermal source of material self thermo-cracking, heat the hot flue gas that has certain calorific value behind the material and has delivered to rotary drying stove drying raw coal by high-temperature blower.Remaining a part of coal gas is as the comprehensive utilization of other Chemicals.
Feed coal described in the step (1) does not have particular requirement to particle diameter, can be smalls, also can be lump coal, the horizontal installation of described rotary drying stove, the type of heating of rotary drying stove can adopt internal heat type, also can adopt external-heat, the heat form that perhaps adopts internal heat type and external-heat to combine; Its heating thermal source utilization revolution charring furnace chuck fume afterheat;
The horizontal installation of revolution charring furnace described in the step (2), revolution charring furnace heat in the exterior wind chuck, type of heating adopts external-heat;
Semicoke quenching described in the step (3) is handled and is adopted revolution cool furnace dry quenching(of coke) technology, semicoke is cooling indirectly in the revolution cool furnace, heat-eliminating medium can be selected the cooling of cooling circulating water spray for use, also can select for use rare gas element to cool off with the red burnt contact heat-exchanging of red heat in the revolution cool furnace.Described rare gas element is meant and does not react with solid phase prod semicoke of the present invention or burn that himself is more stable under high-temperature condition, does not decompose.Hot flue gas or the carbonic acid gas after nitrogen, the fuel combustion for example;
The tar coal gas that revolution charring furnace described in the step (4) is derived, high heating value gas part after separation and purification is sent into the roasting kiln burning, the hot flue gas that produces is as the thermal source of charring furnace material self thermo-cracking, and the fume afterheat after having heated is delivered to the kiln dried raw coal by high-temperature blower again.Remaining a part of finished product coal gas is as the comprehensive utilization of other Chemicals.
Reaction principle of the present invention is as follows:
After the brown coal upgrading was meant processing and utilization processes such as the dehydration of brown coal drying, thermo-cracking, the The Nomenclature Composition and Structure of Complexes of brown coal transformed, and changes into the upgraded coal with approximate bituminous coal character.This technology be brown coal after drying, heating under the secluding air condition, decompose, generate a course of processing of products such as semicoke, tar, coal gas.The main experience of its reaction following several stages:
(1) the dry degassing stage, temperature is at normal temperature to 300 ℃.Contain wet moisture in the brown coal and be subjected to thermal evaporation, coal obtains drying, has the gas that is adsorbed in the coal hole to deviate from simultaneously.About the decarboxylation reaction takes place more than 200 ℃, a large amount of CO are arranged in the gas of separating out greatly
2This stage can be finished the drying and the part deoxidation of brown coal.The brown coal that have burst apart owing to dehydration causes in drying process.
(2) first pyrolysis phase, temperature is between 300 ℃ to 550 ℃.This stage is active catabolic phase, and with the macromolecular depolymerization of brown coal be decomposed into principal reaction, a large amount of volatile matters generate and overflow.Tar generated in this stage; Combustiblecomponents (CH in the coal gas
4, H
2, CO, C
2～C
3) increase with the temperature rising; Solid particulate might further diminish.This stage with obtain tar and thermal value significantly improve with semicoke be main products.
(3) second pyrolysis phase, temperature is between 550 ℃ to 700 ℃.Mainly based on the reaction that comes off of the small molecules side chain or the hydrogen of polyreaction and aromatic hydrocarbon edge joint.Gas yield is improved largely, H in the coal gas
2Content increases very fast, and other component volume contents reduce relatively.Under the isothermal pyrolytical condition, the secondary pyrolysis at high temperature takes place in the unstable tarry vapours of part, and oily productive rate improves with temperature and reduces.
The brown coal pyrolytic reaction is thermo-negative reaction, and heat is provided by the outer heating system of revolution charring furnace.The semicoke that generates is through revolution cool furnace quenching cooling, enter sieve coke installation screening processing by the coke discharging device then and obtain the finished product semicoke, the high temperature rough gas that contains tar that produces absorbs and purifying through tar coal gas separation and purification device, finally obtains finished product tar and high heating value gas.The present invention compares with background technology has following advantage:
(1) the raw material brown coal enter horizontally-arranged rotary drying stove and revolution charring furnace, need not handling equipments such as gas blower, and the granularity to the raw material brown coal does not require simultaneously, smalls, small grain size coal and lump coal all can, improved the utilization ratio of coal.
(2) the revolution charring furnace adopts the external jacket heating, and hot flue gas heats at body of heater external jacket internal recycle; Therefore do not have rare gas element to sneak in the coal gas that produces, but improved the utility value of coal gas greatly, and dwindled the treatment capacity of coal gas purification devices.
(3) discharge of the coke continuously, adopt dry quenching(of coke), improved the quality of semicoke, save energy has reduced the generation of obnoxious flavour.Can not produce a large amount of industrial sewages, save the expense of administering greatly.
(4) through after the upgrading, the semicoke water content of generation is low, fixed carbon content height, has significantly reduced the cost in the brown coal transportation, also makes it utilize prospect more wide.
Description of drawings
Fig. 1 is a square frame process flow diagram of the present invention.
Embodiment
Embodiment 1
The raw material brown coal of 100kg granularity below 8mm are added the rotary drying stove, are that drying was inhaled 20 minutes with taking off about 260 ℃ in temperature, remove wherein moisture content and the gas that is adsorbed in the pore.Dried brown coal add the revolution charring furnace, heat outward by the hot blast chuck to keep 600 ℃ of following thermo-crackings of temperature of charge 1 hour, obtain semicoke after the thermo-cracking, contain the high temperature rough gas of tar.Revolution charring furnace force value is controlled at 20mmH
2About O.High temperature rough gas obtains tar and high heating value gas behind the washing purifying, coal gas and air are sent into the roasting kiln burning behind wherein a part of purifying, and the hot flue gas after the burning is sent in the revolution charring furnace chuck as thermal source; Whole process continuous production, stable temperature control; The revolution charring furnace adopts exotic materials, hot blast connection and reasonable arrangement, heat energy utilization rate height.Send into the quenching of revolution cool furnace by the semicoke that produces after the thermo-cracking by the discharge of revolution charring furnace discharge port, semicoke and water coolant indirect heat exchange in the revolution cool furnace enter sieve coke installation screening processing again and obtain the finished product semicoke after the quenching.The finished product semicoke gets through assay repeatedly: the content of butt fixed carbon about 80%, fugitive constituent＜5%, the calorific value of coal gas: 4200 kilocalories/Nm
3
Embodiment 2
The 80kg granularity is added the rotary drying stove at the raw material brown coal of 8～40mm, is that drying was inhaled 30 minutes with taking off about 280 ℃ in temperature, removes wherein moisture content and the gas that is adsorbed in the pore.Dried brown coal add the revolution charring furnace, heat outward by the hot blast chuck to keep 600 ℃ of following thermo-crackings of temperature of charge 1 hour, obtain semicoke after the thermo-cracking, contain the high temperature rough gas of tar.Revolution charring furnace force value is controlled at 15mmH
2About O.The semicoke that produces after the thermo-cracking is sent into the quenching of revolution cool furnace, uses adverse current normal temperature nitrogen or low-temperature carbon dioxide gas and fervid red burnt heat exchange cooling in the revolution cool furnace.High temperature rough gas obtains tar and high heating value gas behind the washing purifying, coal gas and air are sent into the roasting kiln burning behind wherein a part of purifying, and the hot flue gas after the burning is sent in the revolution charring furnace chuck as thermal source; The finished product semicoke gets through assay repeatedly: the content of butt fixed carbon about 81%, fugitive constituent＜5%, the calorific value of coal gas: 4320 kilocalories/Nm
3
Embodiment 3
The 200kg granularity is added the rotary drying stove at the raw material brown coal of 10～25mm, is that drying was inhaled 35 minutes with taking off about 260 ℃ in temperature, removes wherein moisture content and the gas that is adsorbed in the pore.Dried brown coal add the revolution charring furnace, heat outward by the hot blast chuck to keep between 580～620 ℃ of the temperature of charge thermo-cracking 55 minutes, obtain semicoke after the thermo-cracking, contain the high temperature rough gas of tar.Revolution charring furnace force value is controlled at-10mmH
2About O.The semicoke that produces after the thermo-cracking is sent into and is turned round the cool furnace quenching, cools off with low warm flue gas after the adverse current fuel combustion and fervid red burnt heat exchange in the revolution cool furnace.High temperature rough gas obtains tar and high heating value gas behind the washing purifying, coal gas and air are sent into the roasting kiln burning behind wherein a part of purifying, and the hot flue gas after the burning is sent in the revolution charring furnace chuck as thermal source; The finished product semicoke gets through assay repeatedly: the content of butt fixed carbon about 78%, fugitive constituent＜5%, the calorific value of coal gas: 4050 kilocalories/Nm
3
Claims (7)
1. a method of carrying out the brown coal upgrading with the external-heating revolving stove is characterized in that the raw material brown coal were inhaled 20～40 minutes with taking off in rotary drying stove drying under 100 ℃～300 ℃; The brown coal that drying is taken off after the suction enter revolution charring furnace thermo-cracking, keep temperature of charge 450～700 ℃ of following thermo-cracking 40min～2 hour by external jacket hot blast heating, obtain semicoke and the high temperature rough gas that contains tar after the thermo-cracking, revolution charring furnace pressure maintenance ± 500mmH
2Operate between the O; The semicoke that generates obtains the finished product semicoke of different-grain diameter through after turning round the cool furnace quenching after the screening plant screening; The high temperature rough gas that contains tar that produces obtains the high-quality finished product tar and the finished product coal gas of high heating value through the tar separation purification devices; Wherein a part of finished product coal gas and air are sent into the roasting kiln burning, hot flue gas after the burning is sent into the interior thermal source as material self thermo-cracking of revolution charring furnace chuck, heated the hot flue gas that has certain calorific value behind the material and delivered to the dry raw coal of rotary drying stove by high-temperature blower, remaining a part of finished product coal gas is as the comprehensive utilization of other Chemicals.
2. method of carrying out the brown coal upgrading with the external-heating revolving stove as claimed in claim 1 is characterized in that: to feed coal kind, the place of production, quality without limits, and can also can being mixed for several coals for single coal of planting; Particle diameter is not had particular requirement, can be smalls, also can be lump coal.
3. method of carrying out the brown coal upgrading with the external-heating revolving stove as claimed in claim 1, it is characterized in that: described semicoke quenching is handled and is adopted revolution cool furnace dry quenching(of coke) technology, semicoke is cooling indirectly in the revolution cool furnace, heat-eliminating medium can be selected the cooling of cooling circulating water spray for use, also can select for use rare gas element to cool off with the red burnt contact heat-exchanging of red heat in the revolution cool furnace.
4. method of carrying out the brown coal upgrading with the external-heating revolving stove as claimed in claim 1, it is characterized in that: the horizontal installation of described rotary drying stove, the type of heating of rotary drying stove can adopt internal heat type, also can adopt external-heat, the heat form that perhaps adopts internal heat type and external-heat to combine.
5. method of carrying out the brown coal upgrading with the external-heating revolving stove as claimed in claim 1 is characterized in that: the horizontal installation of described revolution charring furnace, and revolution charring furnace heat in the exterior wind chuck, type of heating adopts external-heat.
6. method of carrying out the brown coal upgrading with the external-heating revolving stove as claimed in claim 2, it is characterized in that: described rare gas element is meant and does not react with solid phase prod semicoke of the present invention or burn, himself is more stable under high-temperature condition, does not decompose.
7. method of carrying out the brown coal upgrading with the external-heating revolving stove as claimed in claim 6 is characterized in that: described rare gas element is hot flue gas or the carbonic acid gas after nitrogen, the fuel combustion.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747179A (en) * | 2012-07-03 | 2012-10-24 | 大连理工大学 | Method for preparing direct reduction iron by using lignite char as reducing agent |
| CN102874850A (en) * | 2012-10-25 | 2013-01-16 | 西安三瑞实业有限公司 | Roasting system and roasting method for lithium-ore acidification by using externally-heated type rotary furnace |
| CN104152163A (en) * | 2014-08-01 | 2014-11-19 | 神华集团有限责任公司 | Crushed coal pyrolysis and coke dry quenching method and device |
| CN104762097A (en) * | 2015-04-13 | 2015-07-08 | 陕西煤业化工集团神木天元化工有限公司 | Rotary furnace low-order powdered coal pyrolysis upgrading method with coal gas circulation |
| CN104789244A (en) * | 2015-04-13 | 2015-07-22 | 陕西煤业化工集团神木天元化工有限公司 | Gas-circulating method for pyrolysis production of anthracite in coal powder rotary furnace |
| CN105199762A (en) * | 2014-06-25 | 2015-12-30 | 中国石油大学(华东) | System for manufacturing tar, semicoke and gas through coal pyrolysis through rotary kiln |
| CN105219407A (en) * | 2012-03-12 | 2016-01-06 | 三菱重工业株式会社 | Dry distillation of coal device |
| CN106350085A (en) * | 2016-09-09 | 2017-01-25 | 新疆广汇中化能源技术开发有限公司 | Dry distillation apparatus |
| CN106479548A (en) * | 2015-08-28 | 2017-03-08 | 李宽义 | Coal base high efficiency of energy cleaning becomes more meticulous using environment-protecting clean method |
| CN106701132A (en) * | 2015-08-28 | 2017-05-24 | 李宽义 | Brown coal upgrading method through high-efficient and clean refined comprehensive utilization of coal-based energy |
| CN107057730A (en) * | 2017-01-16 | 2017-08-18 | 西安三瑞实业有限公司 | A kind of solid waste and the method for coal copyrolysis |
| CN108546556A (en) * | 2018-04-08 | 2018-09-18 | 西北民族大学 | A kind of biomass pyrolysis system |
| CN109666524A (en) * | 2019-01-08 | 2019-04-23 | 孙玉国 | Pure anthracite and its production method and the production line used |
| CN110452723A (en) * | 2019-07-25 | 2019-11-15 | 内蒙古万众炜业科技环保股份公司 | A kind of conservation of energy system of coal production |
| CN115386389A (en) * | 2022-09-22 | 2022-11-25 | 陕西煤业化工技术研究院有限责任公司 | Coal pyrolysis power generation coupling system and process |
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| CN105219407A (en) * | 2012-03-12 | 2016-01-06 | 三菱重工业株式会社 | Dry distillation of coal device |
| CN105602583A (en) * | 2012-03-12 | 2016-05-25 | 三菱重工业株式会社 | Coal dry distillation device |
| CN102747179A (en) * | 2012-07-03 | 2012-10-24 | 大连理工大学 | Method for preparing direct reduction iron by using lignite char as reducing agent |
| CN102874850A (en) * | 2012-10-25 | 2013-01-16 | 西安三瑞实业有限公司 | Roasting system and roasting method for lithium-ore acidification by using externally-heated type rotary furnace |
| CN105199762A (en) * | 2014-06-25 | 2015-12-30 | 中国石油大学(华东) | System for manufacturing tar, semicoke and gas through coal pyrolysis through rotary kiln |
| CN104152163A (en) * | 2014-08-01 | 2014-11-19 | 神华集团有限责任公司 | Crushed coal pyrolysis and coke dry quenching method and device |
| CN104152163B (en) * | 2014-08-01 | 2017-04-26 | 神华集团有限责任公司 | Crushed coal pyrolysis and coke dry quenching method and device |
| CN104762097A (en) * | 2015-04-13 | 2015-07-08 | 陕西煤业化工集团神木天元化工有限公司 | Rotary furnace low-order powdered coal pyrolysis upgrading method with coal gas circulation |
| CN104789244A (en) * | 2015-04-13 | 2015-07-22 | 陕西煤业化工集团神木天元化工有限公司 | Gas-circulating method for pyrolysis production of anthracite in coal powder rotary furnace |
| CN106701132A (en) * | 2015-08-28 | 2017-05-24 | 李宽义 | Brown coal upgrading method through high-efficient and clean refined comprehensive utilization of coal-based energy |
| CN106479548A (en) * | 2015-08-28 | 2017-03-08 | 李宽义 | Coal base high efficiency of energy cleaning becomes more meticulous using environment-protecting clean method |
| CN106350085A (en) * | 2016-09-09 | 2017-01-25 | 新疆广汇中化能源技术开发有限公司 | Dry distillation apparatus |
| CN107057730A (en) * | 2017-01-16 | 2017-08-18 | 西安三瑞实业有限公司 | A kind of solid waste and the method for coal copyrolysis |
| CN108546556A (en) * | 2018-04-08 | 2018-09-18 | 西北民族大学 | A kind of biomass pyrolysis system |
| CN108546556B (en) * | 2018-04-08 | 2020-10-02 | 西北民族大学 | Biomass pyrolysis system |
| CN109666524A (en) * | 2019-01-08 | 2019-04-23 | 孙玉国 | Pure anthracite and its production method and the production line used |
| CN110452723A (en) * | 2019-07-25 | 2019-11-15 | 内蒙古万众炜业科技环保股份公司 | A kind of conservation of energy system of coal production |
| CN115386389A (en) * | 2022-09-22 | 2022-11-25 | 陕西煤业化工技术研究院有限责任公司 | Coal pyrolysis power generation coupling system and process |
| CN115386389B (en) * | 2022-09-22 | 2024-01-30 | 陕西煤业化工技术研究院有限责任公司 | Coal pyrolysis power generation coupling system and process |
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Application publication date: 20111123 |