CN107353936A - The purification separation system and its technique of a kind of hydrogasification synthesis gas - Google Patents
The purification separation system and its technique of a kind of hydrogasification synthesis gas Download PDFInfo
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- CN107353936A CN107353936A CN201710786430.4A CN201710786430A CN107353936A CN 107353936 A CN107353936 A CN 107353936A CN 201710786430 A CN201710786430 A CN 201710786430A CN 107353936 A CN107353936 A CN 107353936A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/86—Other features combined with waste-heat boilers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0966—Hydrogen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Industrial Gases (AREA)
- Hydrogen, Water And Hydrids (AREA)
Abstract
The invention discloses a kind of purification separation system of hydrogasification synthesis gas, consist predominantly of synthesis gas system, hydrogen gas system and boiler water system, synthesis gas system includes gasification furnace, its synthesis gas delivers to the useless pot of synthesis gas after cyclone separator separates, pass sequentially through synthesis air filter, two level hydrogen heater, feedwater preheater and one-level knockout drum again afterwards, the synthesis gas after one-level knockout drum is re-introduced into the second-order separation tank by one-level hydrogen heater and water recirculator；Hydrogen gas system, which includes, is passed into one-level hydrogen heater, the Hydrogen Line of two level hydrogen heater, and the hydrogen after heating is passed into gasification furnace；Boiler water system includes the feedwater piping for being passed into the useless pot of feedwater preheater, synthesis gas.The present invention can realize effective purification of hydrogasification synthesis gas, the reasonable classified utilization of energy, the classification recovery of product, reach reduce energy consumption, reduce equipment investment, extension device service life purpose.
Description
Technical field：
The present invention relates to Coal Gasification Technology field, the purification separation system and its work of a kind of hydrogasification synthesis gas are related generally to
Skill.
Background technology：
Feed coal obtains clean fuel and other chemical products by hydrogasification has good market prospects in China.Raw material
Coal produces substantial amounts of semicoke, primary oil product, while the foreign gas such as also H2S while hydrogasification produces synthesis gas.For
Meet the needs of downstream production process, while reclaim the oil product in synthesis gas, it is necessary to carry out purification separation to synthesis gas.
At present, main purified synthesis gas technique mainly includes the process such as cooling, dedusting, washing, generally existing long flow path,
High energy consumption, the characteristics of quantity of wastewater effluent is big.So that coke-stove gas cools down as an example, its main flow is cold at the beginning of being followed successively by, catches tar, be pre-
It is cold, just take off naphthalene, desulfurization, deamination, wash naphthalene, de- benzene.The spray cycle ammoniacal liquor mainly into the coal gas of high temperature, then it is sent to just
Cooler, it is cooled to 25 DEG C.The ammoniacal liquor and tar that condense out are sent into the ammoniacal liquor defecator of mechanization, isolate ammoniacal liquor, tar and
Tar slag.Coal gas after dedusting cooling removes the naphthalene and sulphur carried secretly in synthesis gas successively through supercooling and ammonia scrubbing.Pass through again
Saturator method removes the ammonia introduced in above-mentioned washing process.Last procedure of gas purification is to wash the benzene in coal gas off, main
If cold cross final cooling tower condensation wash-off benzene, clean gas is obtained.
The content of the invention：
A kind of the defects of the object of the invention is exactly to make up prior art, there is provided purification separation system of hydrogasification synthesis gas
And its technique, it is possible to achieve effective purification of hydrogasification synthesis gas, the reasonable classified utilization of energy, the classification recovery of product,
Reaching reduces energy consumption, reduces equipment investment.
The present invention is achieved by the following technical solutions：
A kind of purification separation system of hydrogasification synthesis gas, it is characterised in that：Consist predominantly of synthesis gas system, hydrogen gas system
And boiler water system, the synthesis gas system include gasification furnace, the gas outlet of the gasification furnace is connected to whirlwind by pipeline
Separator, the gas outlet after the cyclone separator separation are connected to the useless pot of synthesis gas by pipeline, pass through synthesis gas again afterwards
Filter, again by being delivered to two level hydrogen heater and feedwater preheater after the synthesis gas filter cleaning, then
Again by one-level knockout drum, the synthesis gas after one-level knockout drum passes through one-level hydrogen heater and water recirculator again
Enter the second-order separation tank；
The hydrogen gas system includes the Hydrogen Line for being passed into one-level hydrogen heater, and the Hydrogen Line adds with two level hydrogen
The Hydrogen Line of hot device is connected, and heats be passed through again in hydrogen heating furnace successively, and the hydrogen after heating is passed into gasification furnace；
The boiler water system includes the boiler feedwater pipeline for being passed into feedwater preheater, the boiler water after heating
Enter back into synthesis gas and give up and heat in pot, discharge as a vapor.
Described two level hydrogen heater, feedwater preheater, one-level hydrogen heater, water recirculator are preferentially adopted
With vertical heat exchanger, tube side is made in synthesis leave with rage.
The described preferred horizontal tank of the second-order separation tank, realizes synthesis gas, thick naphtalene oil, the three phase separation of waste water.
A kind of purification separation technique of hydrogasification synthesis gas, it is characterised in that：Specific purification separation step is as follows：
（1）Synthesis gas system
The synthesis gas of gasification outlet of still is separated by cyclone separator, and the separative efficiency of the cyclone separator is >=95%, is removed
The bulky grain semicoke carried secretly in synthesis gas, synthesis gas are down to 250 ~ 400 DEG C by the useless pot of synthesis gas, temperature, and synthesis gas passes through conjunction
Into air filter, a small amount of little particle semicoke carried secretly in synthesis gas, the synthesis gas filter outlet solid content are further removed
For 10 ~ 100mg/Nm3, the synthesis gas after purification passes sequentially through two level hydrogen heater and feedwater preheater, and temperature is down to
150 ~ 250 DEG C, one-level hydrogen is now passed through for thick pyrene oil, the synthesis gas at top by one-level knockout drum, the discharge of knockout drum bottom
After hot-air heater and water recirculator, for synthesis gas by the second-order separation tank, the gas of the second-order separation tank top discharge is cleaning
Synthesis gas, knockout drum bottom can discharge respectively crude benzol oil and waste water；
（2）Hydrogen gas system
Hydrogen from battery limit (BL) passes through one-level hydrogen heater and two level hydrogen heater, two level hydrogen heater outlet hydrogen respectively
Temperature degree is 250 ~ 350 DEG C, then by hydrogen heating furnace after, temperature rises to 600 ~ 700 DEG C, is sent into gasification furnace and carries out gasified reverse
Should；
（3）Boiler water system
For boiler water from battery limit (BL) after feedwater preheater, temperature rises to 150 ~ 250 DEG C, is sent into the useless pot production of synthesis gas and steams
Vapour, aerogenesis pressure≤8.0MpaG of the useless pot of the synthesis gas.
In above-mentioned technical proposal, gasification outlet of still is reduced using cyclone separator is first passed through again by the technique of useless pot
Influence of the heat of the semicoke carried in gas to the pot heat exchange area that gives up, while the heat exchange area of useless pot is reduced 3%~5%,
Corrasion of the semicoke carried in gas to heat exchanger tube in the pot that gives up is reduced simultaneously, makes the service life increase by 3~5 of useless pot
Year.
Synthesis gas give up pot can by-product >=7.0MpaG superheated steam, be available for the power steam of full factory to use.Synthesis gas gives up pot
The synthesis gas temperature of outlet is not less than 250 DEG C, avoids the blocking that oil phase condensation in synthesis gas causes downstream unit.In synthesis gas
Little particle semicoke preferentially using can online blowback accurate filter, reduce filter area, reduce the powder of filter outlet
Dust content, accurate filter outlet gas in solid content be 30 ~ 100 mg/Nm3.Synthesis gas filter element is preferentially using burning
Metal material is tied, relative to traditional ceramic element, service life can extend 1 ~ 2 year.
Hydrogen is after one-level hydrogen heater and two level hydrogen heater, then is sent to hydrogen heating stove heat, saves
The load of hydrogen heating furnace 40% ~ 60%.
Boiler feedwater is given up pot after feedwater preheater into process gas, per hour can fecund 5% ~ 10% steam.
And produce thick pyrene oil and crude benzol oil respectively in one-level knockout drum and the second-order separation tank, wherein the purity of thick pyrene oil
>=80wt%, crude benzol oil purity >=70wt%, realize oil product classification recovery, can reduce follow-up oil product separating energy consumption 60% ~
70%.Process gas by the way of cooling down indirectly, compared with traditional water-washing method, can reduce by 60% discharge of wastewater.With it is traditional
Oil wash mode is compared, and can reduce by 20% or so energy consumption.
The preferred one-level separation of described cyclone separator, separative efficiency >=95%, isolates most semicoke particle, keeps away
Influence of the semicoke particle for having exempted to carry secretly in synthesis gas to downstream.Described synthesis gas gives up pot can by-product saturated vapor or overheat steaming
Vapour, preferably superheated steam.Described two level hydrogen heater, feedwater preheater, one-level hydrogen heater, circulating water
Device preferentially uses vertical heat exchanger, and synthesis makes tube side leave with rage, avoids clogging heat exchanger tube after the crude oil cooled and solidified in synthesis gas
The operating mode in road.The described preferred horizontal tank of the second-order separation tank, realize synthesis gas, crude benzol oil, the three phase separation of waste water.
It is an advantage of the invention that：
The present invention can realize effective purification of hydrogasification synthesis gas, the reasonable classified utilization of energy, and the classification of product is reclaimed,
Reach reduction energy consumption, reduction equipment component is invested, the purpose of the service life of prolongation equipment.
Brief description of the drawings：
Fig. 1 is the schematic flow sheet of the present invention.
Embodiment：
Referring to accompanying drawing.
A kind of purification separation system of hydrogasification synthesis gas, consists predominantly of synthesis gas system, hydrogen gas system and boiler
Water system, the synthesis gas system include gasification furnace 1, and the gas outlet of the gasification furnace 1 is connected to cyclonic separation by pipeline
Device 2, the gas outlet after the cyclone separator 2 separates are connected to the useless pot 3 of synthesis gas by pipeline, pass through synthesis gas mistake again afterwards
Filter 4, again by being delivered to two level hydrogen heater 5 and feedwater preheater 6 after synthesis air filter 4 purification, so
Afterwards again by one-level knockout drum 7, the synthesis gas after one-level knockout drum 7 passes through one-level hydrogen heater 8 and circulating water
Device 8 is re-introduced into the second-order separation tank 10；
The hydrogen gas system includes the Hydrogen Line for being passed into one-level hydrogen heater, and the Hydrogen Line adds with two level hydrogen
The Hydrogen Line of hot device 5 is connected, and heats be passed through again in hydrogen heating furnace successively, and the hydrogen after heating is passed into gasification furnace 1；
The boiler water system includes the boiler feedwater pipeline for being passed into feedwater preheater 6, the boiler after heating
Water, which enters back into synthesis gas and given up, to be heated in pot 3, is discharged as a vapor.
Described two level hydrogen heater 5, feedwater preheater 6, one-level hydrogen heater 8, water recirculator 9 are excellent
Vertical heat exchanger is first used, tube side is made in synthesis leave with rage.
Described 10 preferred horizontal tank of the second-order separation tank, realizes synthesis gas, thick naphtalene oil, the three phase separation of waste water.
Its processing step is as follows：
（1）Synthesis gas system
The synthesis gas temperature that gasification furnace 1 exports is 700 ~ 900 DEG C, and pressure is 6.0 ~ 8.0MpaG.Pass through whirlwind
Separator 2 separates, and removes the bulky grain semicoke carried secretly in synthesis gas, separative efficiency >=95%.Synthesis gas gives up by synthesis gas
Pot 3, by-product >=7.0MpaG superheated steams, synthesis gas temperature is down to 250 ~ 400 DEG C.Synthesis gas is entered by synthesizing air filter 4
One step removes a small amount of little particle semicoke carried secretly in synthesis gas, and solid content is 10 ~ 100mg/Nm in exiting syngas3.After purification
Synthesis gas pass sequentially through two level hydrogen heater 5 and feedwater preheater 6, temperature is down to 150 ~ 250 DEG C, now passes through one
Level knockout drum 7, the discharge of knockout drum bottom pass through one-level hydrogen heater 8 and recirculated water cooling for thick pyrene oil, the synthesis gas at top
But after device 9, temperature is down to 40 ~ 60 DEG C.Synthesis gas after cooling passes through the second-order separation tank 10, the gas of the second-order separation tank top discharge
Body is clean synthesis gas, and knockout drum bottom can discharge crude benzol oil and waste water respectively.
（2）Hydrogen gas system
Hydrogen temperature from battery limit (BL) is 40 ~ 80 DEG C, and pressure is 7.5 ~ 8.5PaG, is heated by one-level hydrogen
After device 8, temperature rises to 120 ~ 180 DEG C, and after two level hydrogen heater 5, temperature rises to 250 ~ 350 DEG C, then passes through hydrogen
After gas heating furnace, temperature rises to 600 ~ 700 DEG C, is sent into gasification furnace and carries out gasification reaction.
（3）Boiler water system
Boiler water temperature from battery limit (BL) is 104 ~ 130 DEG C, and after feedwater preheater 6, temperature rises to 150 ~ 250 DEG C,
It is sent into the useless pot of synthesis gas, producing steam.
Claims (4)
- A kind of 1. purification separation system of hydrogasification synthesis gas, it is characterised in that：Consist predominantly of synthesis gas system, hydrogen system System and boiler water system, the synthesis gas system include gasification furnace, and the gas outlet of the gasification furnace is connected to rotation by pipeline Wind separator, the gas outlet after the cyclone separator separation are connected to the useless pot of synthesis gas by pipeline, pass through synthesis again afterwards Air filter, again by being delivered to two level hydrogen heater and feedwater preheater after the synthesis gas filter cleaning, so Afterwards again by one-level knockout drum, the synthesis gas after one-level knockout drum passes through one-level hydrogen heater and water recirculator again It is secondary to enter the second-order separation tank；The hydrogen gas system includes the Hydrogen Line for being passed into one-level hydrogen heater, and the Hydrogen Line adds with two level hydrogen The Hydrogen Line of hot device is connected, and heats be passed through again in hydrogen heating furnace successively, and the hydrogen after heating is passed into gasification furnace；The boiler water system includes the boiler feedwater pipeline for being passed into feedwater preheater, the boiler water after heating Enter back into synthesis gas and give up and heat in pot, discharge as a vapor.
- 2. the purification separation system of hydrogasification synthesis gas according to claim 1, it is characterised in that：Described two level hydrogen Hot-air heater, feedwater preheater, one-level hydrogen heater, water recirculator preferentially use vertical heat exchanger, synthesis gas Walk tube side.
- 3. the purification separation system of hydrogasification synthesis gas according to claim 1, it is characterised in that：Two described fractions From the preferred horizontal tank of tank, synthesis gas, thick naphtalene oil, the three phase separation of waste water are realized.
- A kind of 4. purification separation technique of hydrogasification synthesis gas, it is characterised in that：Specific purification separation step is as follows：(1) synthesis gas systemThe synthesis gas of gasification outlet of still is separated by cyclone separator, and the separative efficiency of the cyclone separator is >=95%, is removed The bulky grain semicoke carried secretly in synthesis gas, synthesis gas are down to 250 ~ 400 DEG C by the useless pot of synthesis gas, temperature, and synthesis gas passes through conjunction Into air filter, a small amount of little particle semicoke carried secretly in synthesis gas, the synthesis gas filter outlet solid content are further removed For 10 ~ 100mg/Nm3, the synthesis gas after purification passes sequentially through two level hydrogen heater and feedwater preheater, and temperature is down to 150 ~ 250 DEG C, one-level hydrogen is now passed through for thick pyrene oil, the synthesis gas at top by one-level knockout drum, the discharge of knockout drum bottom After hot-air heater and water recirculator, for synthesis gas by the second-order separation tank, the gas of the second-order separation tank top discharge is cleaning Synthesis gas, knockout drum bottom can discharge respectively crude benzol oil and waste water；(2) hydrogen gas systemHydrogen from battery limit (BL) passes through one-level hydrogen heater and two level hydrogen heater, two level hydrogen heater outlet hydrogen respectively Temperature degree is 250 ~ 350 DEG C, then by hydrogen heating furnace after, temperature rises to 600 ~ 700 DEG C, is sent into gasification furnace and carries out gasified reverse Should；(3) boiler water systemFor boiler water from battery limit (BL) after feedwater preheater, temperature rises to 150 ~ 250 DEG C, is sent into the useless pot production of synthesis gas and steams Vapour, aerogenesis pressure≤8.0MpaG of the useless pot of the synthesis gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710786430.4A CN107353936B (en) | 2017-09-04 | 2017-09-04 | Purification and separation system and process for hydro-gasification synthesis gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710786430.4A CN107353936B (en) | 2017-09-04 | 2017-09-04 | Purification and separation system and process for hydro-gasification synthesis gas |
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| CN107353936A true CN107353936A (en) | 2017-11-17 |
| CN107353936B CN107353936B (en) | 2019-12-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112080322A (en) * | 2020-09-16 | 2020-12-15 | 新奥科技发展有限公司 | Pulverized coal grading gasification system and method |
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|---|---|---|---|---|
| US20130118075A1 (en) * | 2010-07-19 | 2013-05-16 | Get Patent B.V. | System And Method For Thermal Conversion Of Carbon Based Materials |
| CN105238447A (en) * | 2015-09-18 | 2016-01-13 | 李大鹏 | Apparatus and method for preparing natural gas and light oil from coal |
| CN205115400U (en) * | 2015-11-20 | 2016-03-30 | 新奥科技发展有限公司 | Coal hydrogasification system |
| CN106590712A (en) * | 2016-12-30 | 2017-04-26 | 新奥科技发展有限公司 | Coal hydrogenation catalytic gasification method and device |
-
2017
- 2017-09-04 CN CN201710786430.4A patent/CN107353936B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130118075A1 (en) * | 2010-07-19 | 2013-05-16 | Get Patent B.V. | System And Method For Thermal Conversion Of Carbon Based Materials |
| CN105238447A (en) * | 2015-09-18 | 2016-01-13 | 李大鹏 | Apparatus and method for preparing natural gas and light oil from coal |
| CN205115400U (en) * | 2015-11-20 | 2016-03-30 | 新奥科技发展有限公司 | Coal hydrogasification system |
| CN106590712A (en) * | 2016-12-30 | 2017-04-26 | 新奥科技发展有限公司 | Coal hydrogenation catalytic gasification method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112080322A (en) * | 2020-09-16 | 2020-12-15 | 新奥科技发展有限公司 | Pulverized coal grading gasification system and method |
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Address after: 230088 in the high tech Industrial Development Zone, No. 669, Changjiang West Road, Hefei City, Anhui Province Co-patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Patentee after: EAST CHINA ENGINEERING SCIENCE AND TECHNOLOGY Co.,Ltd. Co-patentee after: XINNENG ENERGY Co.,Ltd. Address before: 230024 No. 70 Wangjiang East Road, Anhui, Hefei Co-patentee before: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Patentee before: EAST CHINA ENGINEERING SCIENCE AND TECHNOLOGY Co.,Ltd. Co-patentee before: XINNENG ENERGY Co.,Ltd. |
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