CN103113924A - Process and system for synthesizing gas to convey gasified powdered coal - Google Patents
Process and system for synthesizing gas to convey gasified powdered coal Download PDFInfo
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- CN103113924A CN103113924A CN2013100254817A CN201310025481A CN103113924A CN 103113924 A CN103113924 A CN 103113924A CN 2013100254817 A CN2013100254817 A CN 2013100254817A CN 201310025481 A CN201310025481 A CN 201310025481A CN 103113924 A CN103113924 A CN 103113924A
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Abstract
The invention discloses a process and a system for synthesizing gas to convey gasified powdered coal, and solves the problems that the conventional powdered coal gasification process is large in equipment investment, high in operation cost, high in energy consumption and heavy in later process burden as inert gases are used as the carrier gas. The process comprises the following steps of: pressurizing the powdered coal and subsequently conveying to a gasification furnace to be gasified along with the carrier gas; deashing and purifying the ash-containing coarse coal obtained from gasification by using a dry method or a wet method so as to obtain a synthesis gas; and using the synthesis gas as the carrier gas to convey the coal powder. The system comprises a coal powder storage cabin, the gasification furnace, a deashing system and a purifying system which are sequentially connected, wherein the purifying system is further provided with a circulation gas outlet; and the circulation gas outlet is connected with an aeration corn inlet of the coal powder storage cabin through a gas compressor. The process disclosed by the invention is very simple, low in energy consumption, low in equipment investment and operation cost and high in aerogenesis purity of the synthesis gas.
Description
Technical field
The present invention relates to a kind of coal dust gasification technique and system, the synthetic gas in a kind of coal dust gasification technique is for delivery of gasification powdered coal technique and system specifically.
Background technology
In the dried coal powder gasification technology, technique commonly used is for delivering to the vapourizing furnace gasification with the coal dust pressurization by carrier gas, gasify the grey raw gas that contains obtain synthetic gas after dry method or wet ash removal, purification.According to the difference of Project Product, the fine coal delivery of carrier gas is for being generally nitrogen or carbon dioxide gas.Adopt above-mentioned rare gas element to have variety of problems as carrier gas; (1) as adopting existing nitrogen to carry, follow-up low temperature washing device for methanol and liquid nitrogen washing device are all needed corresponding amplifying power; (2) as adopting carbon dioxide gas to carry, need to be with carbon dioxide from the low-pressure charging to the high pressure, energy consumption is higher, and the ability of low temperature washing device for methanol is needed to amplify.Need to the carbon dioxide gas of normal pressure be compressed when carbon dioxide gas is carried fine coal simultaneously, this causes pipeline thick especially, take the scale of the project of producing 600000 tons of methyl alcohol per year as example, the carbon dioxide gas line caliber reaches DN900, and washed carbon dioxide gas requires also high to tubing; (3) in addition, no matter adopt nitrogen or carbon dioxide gas as the delivery of carrier gas of fine coal, the rare gas element that contains higher concentration in synthetic gas is caused in the capital, and theory and practice shows that all traditional nitrogen or carbon dioxide gas conveying fine coal technique have the shortcoming that energy consumption is high, plant investment is large.
Summary of the invention
To the objective of the invention is in order solving the problems of the technologies described above, to provide that a kind of technique is very simple, energy consumption is low, facility investment and running cost is low, synthetic gas aerogenesis purity is high synthetic gas be for delivery of gasification powdered coal technique.
The invention provides a kind of system for above-mentioned technique.
Technical scheme comprises delivers to the vapourizing furnace gasification with coal dust pressurization by carrier gas, gasify the grey raw gas that contains obtain synthetic gas after dry method or wet ash removal, purification, adopt synthetic gas as the carrier gas pulverized coal conveying.
The synthetic gas that obtains after purification partly circulates, pressurizes rear as the carrier gas pulverized coal conveying.
In Controlling System, the oxygen concn of carrier gas pulverized coal conveying is lower than volume percent 100ppm.
Synthetic gas after described purification partly circulates, is forced into 5.2-6.0MPaG.
The caliber of the synthetic gas transport pipe before described pressurization is DN50-DN300.
In the synthetic gas that obtains after described purification, inert gas content is lower than 1%vol.
Be used for the synthetic gas of above-mentioned technique for delivery of the gasification powdered coal system, comprise the coal dust bunker, vapourizing furnace, ash disposal system and the purification system that connect successively, described purification system also is provided with the circulation gas outlet, and described circulation gas outlet is connected with the air filling cone import of coal dust bunker through gas compressor.
The caliber of the synthetic gas transport pipe before described pressurization is DN50-DN300.
Described ash disposal system can be existing dry method or wet ash removal system.
The contriver has changed the mode that fine coal delivery of carrier gas in the past adopts nitrogen or carbon dioxide gas usually, carries fine coal by adopting synthetic gas, can effectively improve the energy service efficiency, reduces plant investment.Because the synthetic gas itself that obtains after purifying has higher pressure, only need to overcome that equipment and the resistance of ducting fall can smooth delivery of power fine coal.Overcome the described employing nitrogen of background technology or carbonic acid gas fully as the variety of issue that carrier gas exists, reduced the caliber of delivery cycle synthetic gas pipeline, not high to the requirement of tubing yet.Simultaneously, due to the fine coal delivery of carrier gas is changed into synthetic gas by rare gas element, avoided a large amount of rare gas elementes to enter gasification system, in synthetic gas, inert gas content significantly reduces thereby make, in synthetic gas after being purified, the content of rare gas element can be lower than 1%vol, owing to having avoided a large amount of rare gas elementes to enter gasification system, in vapourizing furnace, the transformationreation of CO (carbon monoxide converter) gas becomes more smooth thereby make in addition, has further reduced the load of the devices such as downstream transforms.
Technique of the present invention has overcome the technology prejudice that carrier gas can only be used rare gas element, adopt synthetic gas as carrier gas, it is carried with traditional nitrogen or carbon dioxide gas, and fine coal is the same has a higher security, namely adopts synthetic gas can not blast when the normal running for delivery of the process system of gasification powdered coal.This is need to satisfy simultaneously three conditions owing to blasting, the first, and flammable explosive gas is in its limits of explosion scope; The second, certain oxygen concentration is arranged; The 3rd, naked light or the spark of igniting synthetic gas are arranged.The present invention adopts synthetic gas to carry fine coal equally to keep the seal operation of the systems such as pipeline, pipe fitting and equipment for delivery of gasification powdered coal with traditional nitrogen or carbon dioxide gas, synthetic gas and fine coal is not to outward leakage, the strict oxygen concentration of controlling is significantly less than the fine coal spontaneous combustion or causes synthetic gas and dust explosive concentration simultaneously, therefore, this system does not satisfy three prerequisites of synthetic gas and dust explosion, and its processing safety is higher.
Beneficial effect:
(1) in the employing gasifying process, the synthetic gas part reuse after purification is directly as the coal dust carrier gas, and technique is very simple, easy and simple to handle, raw material is easy to get, and significantly reduces the consumption of rare gas element, can significantly reduce running cost.
(2) owing to itself having suitable pressure in the synthetic gas after purifying, so compressor load is lighter during reuse, can significantly reduce energy consumption, reduces facility investment, dwindles pipe diameter.
(3) utilize synthetic gas as the coal dust carrier gas, make purify after in synthetic gas inert gas content significantly reduce, the device capability that reduces subsequent handling there is positive effect, be conducive to the device operation of lower procedure, has significantly energy-saving and cost-reducing advantage, greatly reduce the investment of gasification and downstream refining plant, have wide market application foreground.
(4) simple, the investment of system of the present invention and running cost is low, floor space is little, facility compact, energy efficient, safe and reliable.
Description of drawings
Fig. 1 is system diagram of the present invention and schema.
Wherein, 1-coal dust lock hopper, 2-pipeline aerator, 3-coal dust bunker, the import of 3.1-coal dust bunker air filling cone, 4-vapourizing furnace, 5-ash disposal system, 6-gas compressor, 7-purification system, the outlet of 7.1-circulation gas, 7.2-syngas outlet.
Embodiment
Below in conjunction with accompanying drawing, system of the present invention is further explained explanation:
Referring to Fig. 1, coal dust lock hopper 1, pipeline aerator 2, coal dust bunker 3, vapourizing furnace 4, ash disposal system 5 are connected connection with purification system, the outlet of described purification system 7 comprises syngas outlet 7.2 and circulation gas outlet 7.1, and described circulation gas outlet 7.1 is connected with the air filling cone import 3.1 of coal dust bunker 1 through gas compressor 6.
Technical process:
Fine coal is delivered to coal dust bunker 3 through the pressurization of high pressure nitrogen or carbon dioxide gas by pipeline aerator 2 coal dust lock hopper 1 is interior, the pressurization synthetic gas that comes through air filling cone import 3.1 circulations is sent fine coal into the interior gasification of vapourizing furnace 4 as the delivery of carrier gas of fine coal, controlling vapourizing furnace front 4 intrasystem oxygen concns is oxygen concn in the pipeline used of carrier gas pulverized coal conveying lower than volume percent 100ppm(), the gasification gained contains grey raw gas and can adopt dry method or wet ash removal through ash disposal system 5(, this is prior art) remove most of dust, dustiness＜1 mg/Nm after abundant washing
3Synthetic gas enter purification system 7 and remove synthetic gas after being purified after sulfide (total sulfur content is below volume percent 0.1ppm, inert gas content in synthetic gas＜1%vol), most of decontaminating syngas is sent as product by syngas outlet 7.2 and is delivered to downstream unit, all the other small portion decontaminating syngas are sent by circulation gas outlet 7.1, then are sent back in system as the carrier gas of carrying fine coal by air filling cone import 3.1 after synthetic air compressor 8 is forced into 5.2-6.0MPaG by pipeline (caliber is DN50-DN300).The circulating flow rate of described synthetic gas gets final product with the load volume that satisfies the fine coal input.Take the scale of the project of producing 600000 tons of methyl alcohol per year as example, carry fine coal by adopting synthetic gas as carrier gas, because synthetic gas itself has higher pressure, only need to overcome that equipment and the resistance of ducting fall can smooth delivery of power fine coal, can save approximately 5,000,000 yuan of gasification installation inner compressor investments, because reducing downstream carbon monodixe conversion and low-temperature rectisol load, can reduce approximately 1,500 ten thousand yuan of the expenses such as equipment and material, reducing investment outlay amounts to 2,000 ten thousand yuan.From Energy Angle, approximately 2,500,000 yuan of year saving compression work expenses.
Claims (8)
1. a synthetic gas is for delivery of gasification powdered coal technique, and the coal dust pressurization is delivered to the vapourizing furnace gasification by carrier gas, gasify the grey raw gas that contains obtain synthetic gas after dry method or wet ash removal, purification, it is characterized in that, adopt synthetic gas as the carrier gas pulverized coal conveying.
2. synthetic gas as claimed in claim 1 for delivery of gasification powdered coal technique, is characterized in that, the synthetic gas that obtains after purification partly circulates, pressurizes rear as the carrier gas pulverized coal conveying.
3. synthetic gas as claimed in claim 2 for delivery of gasification powdered coal technique, is characterized in that, in Controlling System, the oxygen concn of carrier gas pulverized coal conveying is lower than volume percent 100ppm.
4. synthetic gas as claimed in claim 2 for delivery of gasification powdered coal technique, is characterized in that, the synthetic gas after described purification partly circulates, is forced into 5.2-6.0MPaG.
As the described synthetic gas of claim 1-4 any one for delivery of gasification powdered coal technique, it is characterized in that, the caliber of the synthetic gas transport pipe before described pressurization is DN50-DN300.
As the described synthetic gas of claim 1-4 any one for delivery of gasification powdered coal technique, it is characterized in that, in the synthetic gas that obtains after described purification, inert gas content is lower than 1%vol.
7. a synthetic gas is for delivery of the gasification powdered coal system, comprise the coal dust bunker, vapourizing furnace, ash disposal system and the purification system that connect successively, it is characterized in that, described purification system also is provided with the circulation gas outlet, and described circulation gas outlet is connected with the air filling cone import of coal dust bunker through gas compressor.
8. synthetic gas as claimed in claim 7 for delivery of the gasification powdered coal system, is characterized in that, the caliber of the synthetic gas transport pipe before described pressurization is DN50-DN300.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100254817A CN103113924A (en) | 2013-01-23 | 2013-01-23 | Process and system for synthesizing gas to convey gasified powdered coal |
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| CN2013100254817A CN103113924A (en) | 2013-01-23 | 2013-01-23 | Process and system for synthesizing gas to convey gasified powdered coal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789044A (en) * | 2014-01-22 | 2014-05-14 | 煤炭科学研究总院 | Coal powder conveying device |
| CN104194839A (en) * | 2014-09-01 | 2014-12-10 | 中科合成油工程有限公司 | Method for delivering powdered coal to pressurized gasification furnace in pressurized manner |
| CN109135834A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of air flow bed coal dust hydro-gasification process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090152208A1 (en) * | 2007-12-12 | 2009-06-18 | Agrawal Ravindra K | Method for treatment of process waters using steam |
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- 2013-01-23 CN CN2013100254817A patent/CN103113924A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090152208A1 (en) * | 2007-12-12 | 2009-06-18 | Agrawal Ravindra K | Method for treatment of process waters using steam |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789044A (en) * | 2014-01-22 | 2014-05-14 | 煤炭科学研究总院 | Coal powder conveying device |
| CN103789044B (en) * | 2014-01-22 | 2015-07-15 | 煤炭科学技术研究院有限公司 | Coal powder conveying device |
| CN104194839A (en) * | 2014-09-01 | 2014-12-10 | 中科合成油工程有限公司 | Method for delivering powdered coal to pressurized gasification furnace in pressurized manner |
| CN104194839B (en) * | 2014-09-01 | 2016-08-24 | 中科合成油工程股份有限公司 | Fine coal pressurized delivered is to the method for pressurized-gasification furnace |
| CN109135834A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of air flow bed coal dust hydro-gasification process |
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Application publication date: 20130522 |