CN1376761A - Method and equipment for charging dried coal powder in its pressurized gasification - Google Patents
Method and equipment for charging dried coal powder in its pressurized gasification Download PDFInfo
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- CN1376761A CN1376761A CN 02111205 CN02111205A CN1376761A CN 1376761 A CN1376761 A CN 1376761A CN 02111205 CN02111205 CN 02111205 CN 02111205 A CN02111205 A CN 02111205A CN 1376761 A CN1376761 A CN 1376761A
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Abstract
A method for feeding dried coal powder in pressure gasifying process features that the dried coal powder goes through intermediate material tank where it is pressurized by inertial gas, balance pipe, high-pressure powdered coal cabin and mixer and then into gasifier. Its feeding apparatus is composed of an intermediate material tank, a high-pressure powdered coal cabin and a mixer of carrying gas with powdered coal. Its advantages are stable and controllable feed, simple apparatus and low cost.
Description
Technical field
The present invention relates to the charging process and the device of dry coal powder in a kind of dry coal powder pressure gasifying process, be particularly related to a kind ofly by rotatory feeder valve control dry coal powder flow, and dry coal powder mode with gas delivery under the driving of carrier gas is the reinforced method and apparatus of vapourizing furnace by nozzle.
Background technology
Facts have proved, in coal dust pressurized gasification process, the charging process of dry coal powder and the device that is adopted will directly influence gasification efficiency, stable operation and the security of system of vapourizing furnace, because dry coal powder add-on instability, the carbon ratio that advances vapourizing furnace is also just unstable, low when high during temperature in the stove, can't keep production.Disclosed charging process and the device that is adopted and unsatisfactory, a kind of feeding device is disclosed as Chinese patent CN1032746A, this device comprises " at least two containers with the downward cone-shaped wall of awl point that geometrical shape is identical ", " the control mixture is by the described container flow rate of outlet opening separately; its method is the flow rate of control by first gas of the wall injection of container bottom ", the technical pattern of this patent disclosure is too complicated, make difficulty, simultaneously, also be difficult to accomplish the stable and controllable of feeding quantity, vapourizing furnace is difficult to operation.
Summary of the invention
The technical issues that need to address of the present invention are charging process and the devices thereof that disclose dry coal powder in a kind of dry coal powder pressure gasifying process, thereby to overcome apparatus structure complexity that prior art exists, to make difficulty and because the unstable difficult operation of vapourizing furnace, lower, the unsafe defective of gasification efficiency of causing of feeding quantity.
Method of the present invention comprises the steps:
By e Foerderanlage coal dust is sent into middle batch can, with noble gas to middle batch can pressurising, the coupled high-pressure powdered coal storehouse of pressure in the middle of making in the batch can is identical, the middle batch can control valve of batch can bottom in the middle of opening, and the equilibration tube control valve on the equilibration tube between batch can and the high-pressure powdered coal storehouse in the middle of being connected, fine coal enters the high-pressure powdered coal storehouse by gravity, behind reinforced the finishing, and batch can control valve and balance management and control system valve in the middle of closing;
Fine coal enters mixing tank by the pipeline that is arranged on bottom, high-pressure powdered coal storehouse through rotatory feeder valve, mixes with the carrier gas that feeds mixing tank, is carried by carrier gas and enters vapourizing furnace; The flow velocity that carrier gas enters behind the mixing tank is 20～200m/s, and the flow velocity of mixer outlet carrier gas is 30～200 meter per seconds.
The carrier gas of being addressed comprises superheated vapour, coal gas, carbon dioxide gas or nitrogen and composition thereof.
Occur rat hole and arch formation when preventing the fine coal discharging, can feed noble gas by the noble gas inlet device of batch can in the middle of being arranged on and bottom, high-pressure powdered coal storehouse.
In the preferred scheme of the present invention, the method for batch can comprised the steps: in the middle of coal dust was sent into
For the entrained dry coal powder of low pressure noble gas, at first enter through first cyclonic separator, the dry coal powder enters the storage of low pressure fine coal by the pipeline that is arranged on cyclonic separator bottom and deposits standbyly, and the noble gas that contains a small amount of fine coal filters the back emptying;
Open the low pressure fine coal storehouse control valve that is arranged on bottom, low pressure fine coal storehouse, the low pressure noble gas is sent into low pressure fine coal storehouse, fine coal enters standby by the transfer pot that is provided with conduit that pipeline is connected with it under the acting in conjunction of gravity and low pressure noble gas from low pressure fine coal storehouse;
Close low pressure fine coal storehouse control valve, the low pressure noble gas is sent into the transfer pot bottom, the flow velocity of low pressure noble gas in conduit is 10～60 meter per seconds, and the low pressure noble gas promptly carries fine coal and enters second cyclonic separator;
Isolating fine coal batch can in the middle of whirlwind separator bottom enters in second cyclonic separator, the low pressure noble gas carries a small amount of coal dust and filters the back emptying from the second cyclonic separator top.
The device of realizing above-mentioned charging process comprises at least:
Batch can in the middle of one is used to store fine coal, is that a main body is the high pressure vessel of cylindric bottom for the awl tubular, and the conical surface is provided with the noble gas inlet device;
A high-pressure powdered coal storehouse that is connected by pipeline with middle batch can bottom, this high-pressure powdered coal storehouse be a bottom be provided with at least a discharge port, main body is cylindric and the bottom is the high pressure vessel of frustum tubular, the awl end, be provided with the noble gas inlet, and the conical surface is provided with the noble gas inlet device;
A rotatory feeder valve that links to each other with the outlet material mouth in high-pressure powdered coal storehouse is by the size of rotatory feeder valve rotations per minute control high-pressure powdered coal storehouse discharging amount.
A mixing tank that is connected with the rotatory feeder valve discharge port, this mixing tank is a T type pipe, comprise the carrier gas inlet pipe, fine coal inlet pipe and the mixture outlet tube that are provided with nozzle, the same diameter of carrier gas inlet pipe and mixture outlet tube, coaxial line, its axis and fine coal inlet pipe axis are in same plane and vertical, the import of carrier gas self contained gas accelerates to 20～200m/s through nozzle, the flow velocity of carrier gas mixer outlet carrier gas is 30～200 meter per seconds, fine coal enters from the fine coal inlet pipe, and carry for carrier gas, two bursts of logistics mixing are after mixture outlet tube enters vapourizing furnace.
Be used to realize that the device of charging process of the present invention also comprises:
Be used to separate first cyclonic separator of low pressure noble gas and dry coal powder, this first cyclonic separator is the commercial equipment of a routine;
A low pressure fine coal storehouse that is connected by pipeline bottom cyclonic separator is that a main body is cylindric and the bottom is the low pressure vessel of awl tubular, and the conical surface is provided with the noble gas inlet device.
A transfer pot that is connected by pipeline with bottom, low pressure fine coal storehouse, comprise that a main body is low pressure vessel cylindraceous, the lower end has bell-mouthed conduit and powder metallurgy grid distributor, the powder metallurgy grid distributor is arranged on the bottom of container, conduit is vertically set in the container and is affixed with wall, hydraucone is near the powder metallurgy grid distributor, the other end is connected with the fine coal downstream end, and the fine coal import is arranged on container top, and the import of low pressure noble gas is arranged on the below of powder metallurgy grid distributor.After the low pressure noble gas enters container, distribute through grid distributor, under the effect of air-flow, make fine coal be in fluidization, send transfer pot after hydraucone enters conduit, for guaranteeing to carry effect, the flow velocity of low pressure noble gas in conduit is advisable with 10～60 meter per seconds;
Second cyclonic separator that is connected by pipeline with the transfer pot top, the bottom of this second cyclonic separator is connected with above-mentioned middle batch can by pipeline.
By above-mentioned disclosed technical scheme as seen, charging process of the present invention the most significant advantage compared with prior art is that the course of conveying of fine coal is to rely on rotatory feeder valve to work in coordination with the combination of carrier gas to finish, the feeding quantity stable and controllable, device structure is simple, make easily, can lower investment cost widely, can be for vapourizing furnace is efficient, long-term operation provides condition.
Description of drawings
Fig. 1 is the schema of charging process of the present invention.
Fig. 2 is a high-pressure powdered coal chamber structure synoptic diagram.
Fig. 3 is the noble gas inlet device structural representation of 3 bottoms, low pressure fine coal storehouse.
Fig. 4 is the mixer structure synoptic diagram.
Fig. 5 is a fine coal transfer pot structural representation.
Embodiment
Referring to Fig. 1, method of the present invention comprises the steps:
For the entrained dry coal powder of low pressure noble gas, at first enter first cyclonic separator 1, the pipeline of dry coal powder by cyclonic separator 1 bottom enters low pressure fine coal storehouse 3 and stores for future use, and the low pressure noble gas that contains a small amount of fine coal filters the back emptying.
Rat hole and bridge formation appear when preventing the fine coal discharging, feed noble gas at low pressure fine coal storehouse 3 conical surfaces by noble gas inlet device 16, open the low pressure fine coal storehouse control valve 4 that is arranged on 3 bottoms, low pressure fine coal storehouse, send into the low pressure noble gas to low pressure fine coal storehouse 3, fine coal enters standby by the transfer pot 5 that pipeline is connected with it from low pressure fine coal storehouse 3;
Close low pressure fine coal storehouse control valve 4, the low pressure noble gas is sent into transfer pot 5 bottoms that are provided with conduit 502, the low pressure noble gas promptly carries fine coal and enters second cyclonic separator 6;
Batch can 7 in the middle of isolating fine coal enters from second cyclonic separator, 6 bottoms in second cyclonic separator 6, low pressure noble gas carry a small amount of coal dust and filter the back emptying from second cyclonic separator, 6 tops.
For preventing that fine coal from forming rat hole or bridge formation in middle batch can 7, feed noble gases by noble gas inlet device 16 at the conical surface of middle batch can 7.
With noble gas to middle batch can 7 pressurisings, the coupled high-pressure powdered coal storehouse 8 of pressure in the middle of making in the batch can 7 is identical, the middle batch can control valve 9 of batch can 7 bottoms in the middle of opening, and the equilibration tube control valve 11 on the equilibration tube 10 between batch can 7 and the high-pressure powdered coal storehouse 8 in the middle of being connected, fine coal enters high-pressure powdered coal storehouse 8, behind reinforced the finishing, batch can control valve 9 and balance management and control system valve 11 in the middle of closing;
Fine coal enters rotatory feeder valve 12 by the pipeline that is arranged on 8 bottoms, high-pressure powdered coal storehouse, regulates the revolution of rotatory feeder valve, the discharging amount in may command high-pressure powdered coal storehouse 8.Enter T type mixing tank 13 then, after carrier gas mixes, carried by carrier gas and to enter vapourizing furnace 14, the temperature of carrier gas is 20～500 ℃, and pressure is 2.0～8.0MPa.
Said low pressure noble gas comprises flue gas or nitrogen, and pressure is 0.2～0.8MPa, and temperature is 120～300 ℃.
Said noble gas comprises nitrogen or carbonic acid gas, and pressure is 2.0～8.0MPa, and temperature is 100～300 ℃.
The inventive system comprises:
A main body is cylindric and is batch can 7 in the middle of the high pressure of awl tubular with the bottom, and the conical surface is provided with noble gas inlet device 16;
A high-pressure powdered coal storehouse 8 that is connected by pipeline with middle batch can 7 bottoms, as seen from Figure 2, this high-pressure powdered coal storehouse 8 be a bottom be provided with at least a discharge port 801, main body is cylindric and the bottom is the high pressure vessel of frustum tubular, the awl end, be provided with noble gas inlet 802, and the conical surface is provided with noble gas inlet device 16;
A mixing tank 13 that is connected with the discharge port of rotatory feeder valve 12, as seen from Figure 5, this mixing tank 13 is a T type pipe, comprise the carrier gas inlet pipe 131 that is provided with nozzle 134, fine coal and noble gas inlet pipe 132 and mixture outlet tube 133, carrier gas inlet pipe 131 and mixture outlet tube 133 same diameters, coaxial line, the axis of its axis and fine coal inlet pipe 132 is in same plane and vertical, the import of carrier gas self contained gas accelerates to 20～200m/s through nozzle 134, fine coal and noble gas enter from fine coal inlet pipe 132, and carry for carrier gas, two bursts of logistics mixing are after mixture outlet 133 pipes enter vapourizing furnace 14.
Be used to realize that the device of charging process of the present invention also comprises:
Be used to separate first cyclonic separator 1 of noble gas and dry coal powder, this first cyclonic separator 1 is the commercial equipment of a routine;
A low pressure fine coal storehouse 3 that is connected by pipeline with first cyclonic separator, 1 bottom, this low pressure fine coal storehouse 3 are that a main body is cylindric and the bottom is the low pressure vessel of awl tubular, and the conical surface is provided with noble gas inlet device 16;
One with 3 transfer pot 5 that are connected by pipeline at the bottom of the low pressure fine coal storehouse, as seen from Figure 5, it comprises that a main body is conduit 502 and powder metallurgy grid distributor 503 that low pressure vessel cylindraceous, lower end have hydraucone 501, powder metallurgy grid distributor 503 is arranged on the bottom of container, conduit 502 is vertically set in the container and is affixed with wall, hydraucone 501 is near powder metallurgy grid distributor 503, the other end is connected with fine coal downstream end 504, fine coal import 505 is arranged on container top, and low pressure noble gas import 506 is arranged on the below of powder metallurgy grid distributor 503.After the low pressure noble gas enters container, distribute, under the effect of air-flow, make fine coal be in fluidization, after hydraucone 501 enters conduit 502, send transfer pot 5 through grid distributor 503;
Second cyclonic separator 6 that is connected by pipeline with transfer pot 5 tops, the bottom of this second cyclonic separator 6 is connected with aforesaid middle batch can 7 by pipeline.
Said low pressure fine coal storehouse 3, (Fig. 3 is the noble gas inlet device of 3 bottoms, low pressure fine coal storehouse to the noble gas inlet device 16 of middle batch can 7 or 8 bottoms, high-pressure powdered coal storehouse as shown in Figure 3, the noble gas inlet device 16 of middle batch can 7 or 8 bottoms, high-pressure powdered coal storehouse is identical with Fig. 3), comprise: an import ring 161, a noble gas import 162 that is arranged on the import ring 161, several air-intake ducts 163 that are connected with import ring 161, powder metallurgy air inlet 164 is placed in this air-intake duct 163 ends, noble gas enters powder metallurgy head 164 inner chambers from import ring 161 through air-intake duct 163, enter low pressure fine coal storehouse 3 again, middle batch can 7 or high-pressure powdered coal storehouse 8, because the filteration of powder metallurgy air inlet 164, fine coal can not flow backwards and enter in the activation gas, said powder metallurgy air inlet 164 is a kind of commercially available prod, can adopt science, industry and trade main office of Qingtao Chemical Engineering College product.
For the purpose of guaranteeing safety, at mixing tank and advance on the pipeline between the vapourizing furnace, be provided with high pressure noble gas import 15, in case generation fault, can close the control valve and the carrier gas control valve of bottom, high-pressure powdered coal storehouse immediately, send into the high pressure noble gas, stop the flame development with the high pressure noble gas.
Claims (10)
1. the charging process of dry coal powder in the coal dust pressurized gasification process is characterized in that this method comprises the steps:
With noble gas to being equipped with middle batch can (7) pressurising of coal dust, the coupled high-pressure powdered coal storehouse (8) of pressure in the middle of making in batch can (7) is identical, the middle batch can control valve (9) of batch can (7) bottom in the middle of opening, and the equilibration tube control valve (11) on the equilibration tube (10) between batch can (7) and high-pressure powdered coal storehouse (8) in the middle of being connected, fine coal enters high-pressure powdered coal storehouse (8), behind reinforced the finishing, batch can control valve (9) and balance management and control system valve (11) in the middle of closing;
The pipeline of fine coal by being arranged on high-pressure powdered coal storehouse (8) bottom carried by carrier gas and to enter vapourizing furnace (14) after rotatory feeder valve (12) enters mixing tank (13) and carrier gas mixes.
2. the method for claim 1 is characterized in that, the flow velocity that carrier gas enters behind the mixing tank (13) is 20～200m/s, and the flow velocity of mixing tank (13) outlet carrier gas is 30～200 meter per seconds.
3. the method for claim 1, it is characterized in that, this method also comprises the steps: to be the entrained dry coal powder of low pressure noble gas, at first enters through first cyclonic separator (1), and the pipeline of dry coal powder bottom cyclonic separator (1) enters low pressure fine coal storehouse (3) and store for future use;
Open the low pressure fine coal storehouse control valve (4) that is arranged on (3) portion at the bottom of the low pressure fine coal storehouse, fine coal enters from low pressure fine coal storehouse (3) and its transfer pot that is provided with conduit (502) (5) that is connected by pipeline;
Close low pressure fine coal storehouse control valve (4), the low pressure noble gas is sent into transfer pot (5) bottom, the low pressure noble gas promptly carries fine coal and enters second cyclonic separator (6), and the flow velocity of low pressure noble gas in conduit (502) is 10～60 meter per seconds;
Isolating fine coal batch can (7) in the middle of second cyclonic separator (6) bottom enters in second cyclonic separator (6).
4. method as claimed in claim 3 is characterized in that, feeds noble gas at the bottom of the awl of the conical surface and high-pressure powdered coal storehouse (8) under low pressure fine coal storehouse (3), middle batch can (7), high-pressure powdered coal storehouse (8).
5. method as claimed in claim 4, it is characterized in that, said low pressure noble gas comprises flue gas or nitrogen, and pressure is 0.2～0.8MPa, and temperature is 120～300 ℃, said noble gas comprises nitrogen or carbonic acid gas, pressure is 2.0～8.0MPa, and temperature is 100～300 ℃, and said carrier gas comprises superheated vapour, carbonic acid gas, coal gas, nitrogen or their mixture, the temperature of carrier gas is 20～500 ℃, and pressure is 2.0～8.0MPa.
6. a device of realizing the arbitrary method of claim 1～5 is characterized in that, this device comprises:
Main body is the cylindric and bottom middle batch can (7) for the high pressure vessel of awl tubular, and the conical surface is provided with noble gas inlet device (16);
A high-pressure powdered coal storehouse (8) that is connected by pipeline with middle batch can (7) bottom, this high-pressure powdered coal storehouse (8) be a bottom be provided with at least a discharge port (801), main body is cylindric and the bottom is the high pressure vessel of frustum tubular, the awl end, be provided with noble gas inlet device (802), and the conical surface is provided with noble gas inlet device (16);
A rotatory feeder valve (12) that is connected by pipeline with high-pressure powdered coal storehouse (8);
A mixing tank (13) that is connected with the discharge port of rotatory feeder valve (12), this mixing tank (13) comprise carrier gas inlet pipe (131), fine coal inlet pipe (132) and the mixture outlet tube (133) that is provided with nozzle (134).
7. device as claimed in claim 6 is characterized in that, this device also comprises:
Be used to separate first cyclonic separator (1) of low pressure noble gas and dry coal powder;
A low pressure fine coal storehouse (3) that is connected by pipeline with first cyclonic separator (1) bottom, this low pressure fine coal storehouse (3) are that a main body is cylindric and the bottom is the low pressure vessel of awl tubular, and the conical surface is provided with noble gas inlet device (16);
A transfer pot (5) that is connected by pipeline with bottom, low pressure fine coal storehouse (3), comprise that a main body is low pressure vessel cylindraceous, the lower end has the conduit (502) and the powder metallurgy grid distributor (503) of hydraucone (501), powder metallurgy grid distributor (503) is arranged on the bottom of container, conduit (502) is vertically set in the container and is affixed with wall, hydraucone (501) is near powder metallurgy grid distributor (503), the other end is connected with fine coal downstream end (504), fine coal import (505) is arranged on container top, and noble gas import (506) is arranged on the below of powder metallurgy grid distributor (503);
Second cyclonic separator (6) that is connected by pipeline with transfer pot (5) top, the bottom of this second cyclonic separator (6) is connected with middle batch can (7) by pipeline.
8. device as claimed in claim 7 is characterized in that, at mixing tank (13) and advance on the pipeline between the vapourizing furnace (14), is provided with noble gas import (15).
9. device as claimed in claim 6, it is characterized in that, said noble gas inlet device (16) comprising: an import ring (161), a noble gas import (162) that is arranged on the import ring (161), several air-intake ducts (163) that are connected with import ring (161), powder metallurgy air inlet head (164) is placed in the end of this air-intake duct (163).
10. device as claimed in claim 7, it is characterized in that, said noble gas inlet device (16) comprising: an import ring (161), a noble gas import (162) that is arranged on the import ring (161), several air-intake ducts (163) that are connected with import ring (161), powder metallurgy air inlet head (164) is placed in the end of this air-intake duct (163).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021112053A CN1164716C (en) | 2002-03-29 | 2002-03-29 | Method and equipment for charging dried coal powder in its pressurized gasification |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021112053A CN1164716C (en) | 2002-03-29 | 2002-03-29 | Method and equipment for charging dried coal powder in its pressurized gasification |
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| CN1376761A true CN1376761A (en) | 2002-10-30 |
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Cited By (10)
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| CN101812329A (en) * | 2010-04-15 | 2010-08-25 | 山东省冶金设计院股份有限公司 | Method for making reducing gas special for indirect reduction of iron oxides |
| CN102417111A (en) * | 2010-09-28 | 2012-04-18 | 通用电气公司 | Conveying system and method |
| CN102658975A (en) * | 2012-05-18 | 2012-09-12 | 北京燕山粉研精机有限公司 | High-pressure conveyed continuous powder body quantitative feeding device |
| CN103113925A (en) * | 2013-02-20 | 2013-05-22 | 上海锅炉厂有限公司 | Powdered coal pressure dense-phase conveying device and method of dry coal dust pressure gasification |
| CN103303681A (en) * | 2013-06-07 | 2013-09-18 | 北京神雾环境能源科技集团股份有限公司 | Pulverized coal pressure transmission system and process |
| 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 |
| CN104609188A (en) * | 2015-01-26 | 2015-05-13 | 杭州天丰润滑油有限公司 | Automatic feeding system for powder materials on vacuum condition |
| US9429273B2 (en) | 2012-05-03 | 2016-08-30 | General Electric Company | Vessel apparatus with flow control element |
| CN106516752A (en) * | 2016-11-11 | 2017-03-22 | 航天长征化学工程股份有限公司 | Plunger type pulverized coal pressurized conveying device |
| CN110040518A (en) * | 2019-05-08 | 2019-07-23 | 宁夏神耀科技有限责任公司 | The system and its delivery method of supercritical carbon dioxide conveying solid substance raw material |
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| CN100450901C (en) * | 2005-07-11 | 2009-01-14 | 西安热工研究院有限公司 | Dry coal pressure closed phase conveyer with several discharge branches |
| CN100351349C (en) * | 2005-12-23 | 2007-11-28 | 李园 | Control method for powdered coal pressure and transferring program for powdered coal gasification |
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- 2002-03-29 CN CNB021112053A patent/CN1164716C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812329A (en) * | 2010-04-15 | 2010-08-25 | 山东省冶金设计院股份有限公司 | Method for making reducing gas special for indirect reduction of iron oxides |
| CN102417111A (en) * | 2010-09-28 | 2012-04-18 | 通用电气公司 | Conveying system and method |
| US9429273B2 (en) | 2012-05-03 | 2016-08-30 | General Electric Company | Vessel apparatus with flow control element |
| CN102658975A (en) * | 2012-05-18 | 2012-09-12 | 北京燕山粉研精机有限公司 | High-pressure conveyed continuous powder body quantitative feeding device |
| CN103113925A (en) * | 2013-02-20 | 2013-05-22 | 上海锅炉厂有限公司 | Powdered coal pressure dense-phase conveying device and method of dry coal dust pressure gasification |
| CN103113925B (en) * | 2013-02-20 | 2014-07-09 | 上海锅炉厂有限公司 | Powdered coal pressure dense-phase conveying device and method of dry coal dust pressure gasification |
| CN103303681A (en) * | 2013-06-07 | 2013-09-18 | 北京神雾环境能源科技集团股份有限公司 | Pulverized coal pressure transmission system and process |
| 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 |
| CN104609188A (en) * | 2015-01-26 | 2015-05-13 | 杭州天丰润滑油有限公司 | Automatic feeding system for powder materials on vacuum condition |
| CN106516752A (en) * | 2016-11-11 | 2017-03-22 | 航天长征化学工程股份有限公司 | Plunger type pulverized coal pressurized conveying device |
| CN106516752B (en) * | 2016-11-11 | 2024-05-28 | 航天长征化学工程股份有限公司 | Plunger type pulverized coal pressurized conveying device |
| CN110040518A (en) * | 2019-05-08 | 2019-07-23 | 宁夏神耀科技有限责任公司 | The system and its delivery method of supercritical carbon dioxide conveying solid substance raw material |
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|---|---|
| CN1164716C (en) | 2004-09-01 |
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