CN1540209A - Equipment and implementing method capable of regulation controlling and uniform distributing flux of powdered coal - Google Patents
Equipment and implementing method capable of regulation controlling and uniform distributing flux of powdered coal Download PDFInfo
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- CN1540209A CN1540209A CNA200310108386XA CN200310108386A CN1540209A CN 1540209 A CN1540209 A CN 1540209A CN A200310108386X A CNA200310108386X A CN A200310108386XA CN 200310108386 A CN200310108386 A CN 200310108386A CN 1540209 A CN1540209 A CN 1540209A
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- carrier gas
- pulverized coal
- flow
- mixture
- coal dust
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- 239000003245 coal Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000004907 flux Effects 0.000 title claims description 12
- 239000012159 carrier gas Substances 0.000 claims description 72
- 239000002817 coal dust Substances 0.000 claims description 46
- 238000002309 gasification Methods 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 238000009826 distribution Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 238000009827 uniform distribution Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 8
- 230000008602 contraction Effects 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 239000008246 gaseous mixture Substances 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229910001868 water Inorganic materials 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- Air Transport Of Granular Materials (AREA)
Abstract
A method and apparatus for regulating, controlling and uniformly distributing the flow of powdered coal features that when the powdered coal is delivered from feeding cabin to gasifier pneumatically, it goes through flow regulator, flow measurer and gasifying nozzle.
Description
Technical field
The present invention relates to coal dust conveying device and method of operating thereof in the powdered coal pressuring gasified process, particularly a kind of device and the method for operating that can regulate control and uniform distribution pulverized coal flow.
Background technology
In powdered coal pressuring gasified process, the adjusting of pulverized coal flow control and the uniformity of distributing on the multichannel feed-line will directly influence the safety of technic index, stable operation and the whole system of coal gasification course.If it is unstable that pulverized coal flow is regulated control, the pulverized coal flow maldistribution on each road pipeline, the CONCENTRATION DISTRIBUTION in the gasification furnace, Temperature Distribution will the substantial deviation requirements, will cause gasification efficiency low, gasification furnace refractory material and gasification nozzle scaling loss etc.
In existing coal dust charging process, disclose a kind of flammable particulate solids and gas flow rate of mixture of making as Chinese patent CN1032746A and kept stable feeder equipment, " the control mixture is by the flow rate of described container outlet opening separately; its method is the flow rate of control via first gas of the wall injection of container bottom ", the adjusting control range of this method is little, dumb, no effective measures guarantee the uniform distribution of each tap flow rate, and device structure complexity, make difficulty, be difficult to satisfy the demand of powdered coal pressuring gasified technology.
Summary of the invention
The technical issues that need to address of the present invention are to disclose a kind of device and the method for operating that can regulate control and uniform distribution pulverized coal flow, to overcome the deficiency that prior art exists.
Technical scheme of the present invention:
A kind of device that can regulate control and uniform distribution pulverized coal flow comprises:
The bottom has the pressurization feed bin of one or more material flow outlets;
The pulverized coal flow adjuster that is used to regulate the carrier gas inlet of pulverized coal flow by being provided with of being connected of pipeline and the outlet of pressurization feed bin material flow;
Be arranged on the carrier gas flux governor motion at carrier gas inlet place;
The pulverized coal flow measuring instrument that is connected with the pulverized coal flow adjuster by pipeline;
Be arranged on one or more gasification nozzles on the gasification furnace by what pipeline was connected with the pulverized coal flow measuring instrument.
Pulverized coal flow adjuster of the present invention comprises carrier gas inlet pipe, carrier gas outer tube, carrier gas distribution inner sleeve and a contraction enlarged tube, the import of shrinking enlarged tube is connected with the outlet of carrier gas inner sleeve, shrink the enlarged tube outlet and be connected with feed-line, its exit internal diameter is identical with the feed-line internal diameter.For the carrier gas that adds in the Pulverized Coal Regulator is distributed in the middle of the mixture of coal dust and carrier gas equably, reduce the pulverized coal flow fluctuation, guarantee to carry stable, carrier gas distribution inner sleeve is made by porous metal material, and its internal diameter is identical with the feed-line internal diameter.
The method of operating of said apparatus comprises the steps:
Take out of from the material flow outlet of pressurization feed bin bottom by will the pressurize coal dust of feed bin of carrier gas, the mixture of coal dust and carrier gas enters the pulverized coal flow adjuster through pipeline subsequently, regulate the carrier gas flux that enters the pulverized coal flow adjuster by the carrier gas flux governor motion: when the carrier gas flux that enters the pulverized coal flow adjuster increases, the flow of coal dust will reduce, otherwise then increase, the mixture of coal dust and carrier gas enters the pulverized coal flow measuring instrument then, to measure the flow of coal dust, can calculate the coal dust conveying capacity by coal dust speed that records and coal powder density, coal dust finally enters gasification furnace by the one or more gasification nozzles that are connected with feed-line with the mixture of carrier gas.
The basic principle of pulverized coal flow uniform distribution is to utilize the synergy of pulverized coal flow adjuster and gasification nozzle to realize among the present invention.Specifically, the mixture of coal dust and carrier gas has produced for the local resistance from the pressurization feed bin to the absolute dominating role of whole system resistance of gasification furnace when aditus laryngis by the pulverized coal flow adjuster and gasification nozzle, and they account for 90～95% of system's drag overall altogether.Specifically, the mixture of coal dust and carrier gas is 50～100m/s by the superficial gas velocity at adjuster aditus laryngis place, and the superficial gas velocity that exports by gasification nozzle is 40～80m/s, and this two parts resistance accounts for 50～80% and 20～50% of system's drag overall respectively.As long as the local resistance on each feed-line equates, just can guarantee the uniform distribution of pulverized coal flow.
The advantage of apparatus and method of the present invention is: pulverized coal flow is regulated and controlled to the carrier gas flux that can be easily and flexibly enters Pulverized Coal Regulator by change, simultaneously under the synergy of Pulverized Coal Regulator and gasification nozzle, can make from coal dust pressurization feed bin and enter the multichannel feed-line, enter the pulverized coal flow realization uniform distribution of gasification furnace at last through a plurality of gasification nozzles.This shows that pulverized coal flow adjusting control range of the present invention is big, flexible operation, device structure is simple, is easy to processing and fabricating, can effectively control the uniform distribution of pulverized coal flow, and the powdered coal pressuring gasified reliable technique that provides can be provided.
Description of drawings
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is the structural representation of pulverized coal flow adjuster.
Fig. 3 is a gasification nozzle internal channel structural representation.
The specific embodiment
Referring to Fig. 1, a kind of device that can regulate control and uniform distribution pulverized coal flow comprises:
The bottom has the pressurization feed bin 1 of one or more material flow outlets 2;
The pulverized coal flow adjuster 3 that is used to regulate the carrier gas inlet 23 of pulverized coal flow by being provided with of being connected of pipeline and pressurization feed bin material flow outlet 2;
Be arranged on the carrier gas flux governor motion 28 at carrier gas inlet 23 places, this governor motion 28 can adopt conventional control valve etc.;
Pulverized coal flow measuring instrument 4 by pipeline is connected with pulverized coal flow adjuster 3 is a kind of condenser type mass flowmenter, is the solid mass flow meter of DMK270 as the model that can adopt RAMSEY company to produce;
By pipeline and pulverized coal flow measuring instrument mutually 4 be communicated be arranged on one or more gasification nozzles 5 on the gasification furnace 6.
Referring to Fig. 2, said pulverized coal flow adjuster 3 comprises that close coal dust and carrier gas mixture import one end are provided with the carrier gas outer tube 22 of carrier gas inlet 23, carrier gas distribution inner sleeve 21 and a contraction enlarged tube 24; Said carrier gas distribution inner sleeve 21 is arranged in the carrier gas outer tube 22, this carrier gas distribution inner sleeve 21 is made by porous metal material, its internal diameter is identical with the conveyance conduit internal diameter, carrier gas outer tube 22 is coaxial with carrier gas distribution inner sleeve 21, the import of said contraction enlarged tube 24 is connected with 21 outlets of carrier gas inner sleeve, and its import internal diameter is identical with carrier gas inner sleeve 21 internal diameters.Shrink enlarged tube 24 outlets and be connected with feed-line, its outlet internal diameter is identical with the feed-line internal diameter.The contraction angle θ 1 that shrinks enlarged tube 24 converging transitions 25 is 3～8 degree, and the expanded-angle θ 2 of divergent segment 26 is 5～10 degree, and there is a straight length at aditus laryngis 27 places at the minimum place of diameter, and this flow development length is 8～20mm.When the mixture of coal dust and carrier gas passes through this aditus laryngis at the superficial gas velocity with 50～100m/s, produce local resistance, this local resistance accounts for 50～80% of system's drag overall.Because the variation of the flow area of coal dust and carrier gas mixture is gradual change in pulverized coal flow adjuster 2, so clogging can not occur;
The structure of said gasification nozzle 5 comprises nozzle body 52 and the internal channel 51 that is arranged in the main body 52 as shown in Figure 3, and the inlet diameter of internal channel 51 equates that with pipe diameter internal channel 51 actual internal areas are gradual changes, and angle of throat θ is 3～8 °.
The method of operating of said apparatus comprises the steps:
Take out of from the material flow outlet 2 of pressurization feed bin 1 bottom by will the pressurize coal dust of feed bin 1 of two bursts of carrier gas, the mixture of coal dust and carrier gas enters pulverized coal flow adjuster 3 through pipeline subsequently, regulate the carrier gas flux that enters pulverized coal flow adjuster 3 by carrier gas flux governor motion 28, to regulate the flow of control coal dust, the mixture of coal dust and carrier gas enters pulverized coal flow measuring instrument 4 then, to measure the flow of coal dust, can calculate the coal dust conveying capacity by coal dust speed that records and coal powder density, coal dust finally enters gasification furnace 6 by the one or more gasification nozzles 5 that are connected with feed-line with the mixture of carrier gas.
Coal powder density is 100～600kg/m in the mixture of coal dust and carrier gas
3
The carrier gas of being addressed comprises nitrogen, carbon dioxide, water vapour, synthesis gas and gaseous mixture thereof.
In order to ensure safety, prevent tempering, the coal dust in nozzle 5 internal channels 51 exits and the superficial gas velocity of carrier gas mixture are 40～80m/s.Consequent local resistance accounts for 40～50% of system's drag overall.
Embodiment 1
, as carrier gas the coal dust that fine coal pressurizes in the feed bin is taken out of from two material outlets of feed bin bottom with nitrogen, and be that the feed-line of 30mm is sent into coal dust in the gasification furnace that is provided with two gasification nozzles by the two-way internal diameter.The coal dust conveying capacity of this conveying device is 10～24 tons/hour, and the conveying capacity of single pipeline is 5～12 tons/hour.The pulverized coal flow adjuster that is provided with on each road feed-line and the main structure parameters of gasification nozzle are as follows: the distributor pipe internal diameter also promptly shrinks enlarged tube to import and export internal diameter is 30mm in the carrier gas, angle of throat (θ 1) 5 degree, extended corner (θ 2) 9 degree, throat diameter is 11mm, the flow development length 10mm of aditus laryngis place; Gasification nozzle internal channel import internal diameter 30mm, spout internal diameter 13mm, nozzle internal channel angle of throat (θ) are 6 degree.
The nitrogen flow that enters the pulverized coal flow adjuster is controlled by control valve.When the nitrogen flow that enters the pulverized coal flow adjuster is 5m
3During/h, the coal powder density in coal dust and the nitrogen mixture is 450kg/m
3This mixture respectively with the superficial gas velocity of 60m/s and 45m/s by Pulverized Coal Regulator and gasification nozzle internal channel, consequent local resistance accounts for 58% and 33% of drag overall respectively, this moment, the conveying capacity of this system reached 20 tons/hour, the relative error that is distributed in two pulverized coal flows on the feed-line is not more than 5%, promptly the pulverized coal flow of a feed-line is 9.8 tons/hour, and another root is 10.2 tons/hour.When needs change the coal dust conveying capacity, be reduced to 14 tons/hour as conveying capacity by 20 tons/hour with system, method of operating is as follows: open two nitrogen flow control valves simultaneously, nitrogen flow is increased gradually, this moment, the coal dust conveying capacity will correspondingly reduce, coal powder density also can reduce, when nitrogen flow increases to～8m
3During/h, the pulverized coal flow on the two-way pipeline just is reduced to～and 7 tons/hour, the coal dust total flow then is adjusted to 14 tons/hour.Because the adding of nitrogen, coal powder density will be reduced to 280kg/m in coal dust and the nitrogen mixture
3, this mixture is respectively 73m/s and 52m/s by the superficial gas velocity of Pulverized Coal Regulator and gasification nozzle internal channel, and consequent local resistance accounts for 93% of system's drag overall, and at this moment the relative error of the defeated flow of coal dust still is not more than 5% on the two-way pipeline.In the aforesaid operations process, the actual flow of coal dust all is to be that the solid mass flow meter of DMK270 is measured by the model that RAMSEY company produces on each road pipeline.
Claims (10)
1. the device that can regulate control and uniform distribution pulverized coal flow comprises that the bottom has the pressurization feed bin (1) of one or more material flow outlets (2), it is characterized in that, also comprises:
Export the pulverized coal flow adjuster (3) that is provided with the carrier gas inlet (23) that is used to regulate pulverized coal flow that (2) are connected by pipeline with pressurization feed bin material flow:
Be arranged on the carrier gas flux governor motion (28) that carrier gas inlet (23) is located;
The pulverized coal flow measuring instrument (4) that is connected with pulverized coal flow adjuster (3) by pipeline;
Be arranged on one or more gasification nozzles (5) on the gasification furnace (6) by what pipeline was connected with pulverized coal flow measuring instrument (4).
2. device according to claim 1, it is characterized in that, said pulverized coal flow adjuster (3) comprises that close coal dust and carrier gas mixture import one end are provided with the carrier gas outer tube (22) of carrier gas inlet (23), carrier gas distribution inner sleeve (21) and a contraction enlarged tube (24), said carrier gas distribution inner sleeve (21) is arranged in the carrier gas outer tube (22), this carrier gas distribution inner sleeve (21) is made by porous metal material, and the import of said contraction enlarged tube (24) is connected with carrier gas inner sleeve (21) outlet.
3. device according to claim 2, it is characterized in that the contraction angle of shrinking enlarged tube (24) converging transition (25) is 3～8 degree, the expanded-angle of divergent segment (26) is 5～10 degree, the aditus laryngis (27) at the minimum place of diameter has been located a straight length, and length of pipe section is 8～20mm.
4. device according to claim 2 is characterized in that, carrier gas outer tube (22) is coaxial with carrier gas distribution inner sleeve (21).
5. device according to claim 3 is characterized in that, carrier gas outer tube (22) is coaxial with carrier gas distribution inner sleeve (21).
6. device according to claim 1 is characterized in that, said gasification nozzle (5) comprises nozzle body (52) and be arranged on internal channel (51) in the main body (52), and the actual internal area of internal channel (51) is gradual change, and angle of throat θ is 3～8 °.
7. according to the method for operating of each described device of claim 1～6, it is characterized in that, comprise the steps:
Take out of from the material flow outlet (2) of pressurization feed bin (1) bottom by will the pressurize coal dust of feed bin (1) of carrier gas, the mixture of coal dust and carrier gas enters pulverized coal flow adjuster (3) through pipeline subsequently, regulate the carrier gas flux that enters pulverized coal flow adjuster (3) by carrier gas flux governor motion (28), to regulate the flow of control coal dust, the mixture of coal dust and carrier gas enters pulverized coal flow measuring instrument (4) then, and coal dust finally enters gasification furnace (6) by the one or more gasification nozzles (5) that are connected with feed-line with the mixture of carrier gas.
8. method according to claim 7 is characterized in that, coal powder density is 100～600kg/m in the mixture of coal dust and carrier gas
3
9. method according to claim 7 is characterized in that the carrier gas of being addressed comprises a kind of and gaseous mixture in nitrogen, carbon dioxide, water vapour or the synthesis gas.
10. according to claim 7,8 or 9 described methods, it is characterized in that, the mixture of coal dust and carrier gas is 50～100m/s by the superficial gas velocity at adjuster (3) aditus laryngis place, and the coal dust in nozzle (5) internal channel (51) exit and the superficial gas velocity of carrier gas mixture are 40～80m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310108386 CN1279314C (en) | 2003-11-03 | 2003-11-03 | Equipment and implementing method capable of regulation controlling and uniform distributing flux of powdered coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310108386 CN1279314C (en) | 2003-11-03 | 2003-11-03 | Equipment and implementing method capable of regulation controlling and uniform distributing flux of powdered coal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540209A true CN1540209A (en) | 2004-10-27 |
| CN1279314C CN1279314C (en) | 2006-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310108386 Expired - Fee Related CN1279314C (en) | 2003-11-03 | 2003-11-03 | Equipment and implementing method capable of regulation controlling and uniform distributing flux of powdered coal |
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| CN (1) | CN1279314C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102690687A (en) * | 2012-06-18 | 2012-09-26 | 天津渤海化工有限责任公司天津碱厂 | Improved coal dust conveying method |
| CN102997268A (en) * | 2012-10-24 | 2013-03-27 | 西北工业大学 | Anti-tempering powder supply 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 |
| CN105602627A (en) * | 2016-03-16 | 2016-05-25 | 华东理工大学 | Flow distribution device |
| CN108545483A (en) * | 2018-06-13 | 2018-09-18 | 华东理工大学 | A kind of device and method of powder material Dense Phase Pneumatic Conveying |
| CN109207203A (en) * | 2017-06-30 | 2019-01-15 | 神华集团有限责任公司 | Gasification furnace and its feeding device, burner and solid fuel dispenser |
| CN110295062A (en) * | 2018-03-23 | 2019-10-01 | 中国石化扬子石油化工有限公司 | A kind of part seam jumps the control method of gasification installation stable operation after vehicle |
| CN112902158A (en) * | 2021-03-01 | 2021-06-04 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal-fired power plant pulverized coal airflow deviation adjusting device and adjusting method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383001B (en) | 2012-05-03 | 2016-04-27 | 通用电气公司 | Apparatus for feeding |
-
2003
- 2003-11-03 CN CN 200310108386 patent/CN1279314C/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102690687A (en) * | 2012-06-18 | 2012-09-26 | 天津渤海化工有限责任公司天津碱厂 | Improved coal dust conveying method |
| CN102690687B (en) * | 2012-06-18 | 2016-12-21 | 天津渤海化工有限责任公司天津碱厂 | A kind of coal dust carrying method of improvement |
| CN102997268A (en) * | 2012-10-24 | 2013-03-27 | 西北工业大学 | Anti-tempering powder supply 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 |
| CN105602627A (en) * | 2016-03-16 | 2016-05-25 | 华东理工大学 | Flow distribution device |
| CN105602627B (en) * | 2016-03-16 | 2018-10-02 | 华东理工大学 | Flow distribution device |
| CN109207203B (en) * | 2017-06-30 | 2020-07-31 | 神华集团有限责任公司 | Gasification furnace and feeding device, burner and solid fuel distributor thereof |
| CN109207203A (en) * | 2017-06-30 | 2019-01-15 | 神华集团有限责任公司 | Gasification furnace and its feeding device, burner and solid fuel dispenser |
| CN110295062A (en) * | 2018-03-23 | 2019-10-01 | 中国石化扬子石油化工有限公司 | A kind of part seam jumps the control method of gasification installation stable operation after vehicle |
| CN108545483A (en) * | 2018-06-13 | 2018-09-18 | 华东理工大学 | A kind of device and method of powder material Dense Phase Pneumatic Conveying |
| CN108545483B (en) * | 2018-06-13 | 2024-02-27 | 华东理工大学 | Dense-phase pneumatic conveying equipment and method for powder materials |
| CN112902158A (en) * | 2021-03-01 | 2021-06-04 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal-fired power plant pulverized coal airflow deviation adjusting device and adjusting method |
| CN112902158B (en) * | 2021-03-01 | 2023-10-20 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal-fired power plant pulverized coal airflow deviation adjusting device and adjusting method |
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| Publication number | Publication date |
|---|---|
| CN1279314C (en) | 2006-10-11 |
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