CN208327909U - A kind of coal grading sub-prime for pulverized-coal fired boiler utilizes system - Google Patents
A kind of coal grading sub-prime for pulverized-coal fired boiler utilizes system Download PDFInfo
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- CN208327909U CN208327909U CN201821002696.1U CN201821002696U CN208327909U CN 208327909 U CN208327909 U CN 208327909U CN 201821002696 U CN201821002696 U CN 201821002696U CN 208327909 U CN208327909 U CN 208327909U
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Abstract
The utility model relates to a kind of coal grading sub-primes for pulverized-coal fired boiler to utilize system, system includes jacket type down-flow fluidized bed using ECT pyrolysis reactor, semicoke separator, high-temperature filter, gas and oil separating plant, boiler and multiple coal-char combustion devices, and jacket type down-flow fluidized bed using ECT pyrolysis reactor includes inner and outer tubes；First pyrolysis gas and semicoke entrance and the first pyrolysis gas and semicoke outlet connection, first pyrolysis gas outlet is connect by high-temperature filter with gas and oil separating plant, the outlet of first semicoke is connect with primary wind pipe, multiple coal-char combustion devices are evenly arranged on the side wall of boiler, and the first semicoke entrance of each coal-char combustion device is connect with primary wind pipe.The utility model is directed to pulverized-coal fired boiler process system, a kind of coal dust that structure is simple and convenient to operate classification sub-prime is provided and utilizes system and method, existing pulverized-coal fired boiler process system is transformed small, with the tar and combustion gas resource in lower cost recovery pyrolysis of coal volatile matter, the economic benefit of power plant is improved.
Description
Technical field
The utility model relates to coal grading sub-primes to utilize technical field, and in particular to a kind of coal grading for pulverized-coal fired boiler
Sub-prime utilizes system.
Background technique
In traditional power generation, high-temperature flue gas is generated by the directly burning of coal in boiler, to produce steam drive
Steam turbine power generation.During burning of coal, the fuel gas and tar that pyrolysis of coal generates also occur combustion reaction and are consumed,
Cause the waste of resource.Volatile component in coal is recycled, obtains combustion gas and tar resource, and again by remaining coke
Combustion power generation is carried out, the resource utilization rate of coal can be improved, especially for using lignite and the higher bituminous coal of volatile matter etc.
The economic benefit of power plant can be improved in the coal-burning power plant of coal.
The a large amount of coal-fired electric generation furnaces in China are pulverized-coal fired boiler, increase pyrolysis of coal reactor before pulverized-coal fired boiler, can be effective
Recycle the combustion gas in pyrolysis of coal product and tar.Chinese Patent Application No. is that the patent document of CN200810240945 discloses one
Kind pulverized-coal fired boiler furnace front coal head-drawing method recycles the pyrolysis gas containing tar, solid thermal using solid heat carrier pyrolysis gasification installation
Carrier experience is mixed with coal dust, is recycled, heating, separating circulation, but this pyrolysis system process is complicated.Chinese Patent Application No.
A kind of pyrolysis of coal reactor and pulverized-coal fired boiler combined system are disclosed for the patent document of CN201610204699, using heat accumulating type
Descending-bed reactor recycles combustion gas and tar, and more heat accumulation type radiant tubes of pyrolysis reactor layered arrangement, its structure is complicated, in order to
Realize that accurate temperature controlling needs to control the gas flow of each radiant tube, operation control requires powder processed dress that is high, and needing additional
Processing feed coal and semicoke are set, so that its partial size meets the requirement of pulverized-coal fired boiler.
Utility model content
The purpose of this utility model is to provide a kind of coal grading sub-primes for pulverized-coal fired boiler to utilize system and method, uses
To solve, existing coal dust is complicated there are the wasting of resources, pyrolysis system and working-flow using technology and device controls not
Just the problem of.
To achieve the above object, the utility model provides a kind of coal grading sub-prime for pulverized-coal fired boiler using system, institute
It includes jacket type down-flow fluidized bed using ECT pyrolysis reactor, semicoke separator, height that the coal grading sub-prime for pulverized-coal fired boiler, which is stated, using system
Warm filter, gas and oil separating plant, boiler and multiple coal-char combustion devices, the jacket type down-flow fluidized bed using ECT pyrolysis reactor includes inner tube
With the outer tube for being sheathed on said inner tube periphery, the first coal powder entrance is provided at the top of said inner tube, the bottom of said inner tube is set
It is equipped with the first pyrolysis gas and semicoke outlet, the outer tube is provided with high-temperature flue gas entry and low-temperature flue gas outlet；The semicoke point
Device is provided with the first pyrolysis gas and semicoke entrance, the outlet of the first semicoke and the first pyrolysis gas outlet, first pyrolysis gas
It is connected with semicoke entrance and the outlet of first pyrolysis gas and semicoke, first pyrolysis gas outlet passes through the high-temperature filter
It is connect with the gas and oil separating plant, the first semicoke outlet is connect with primary wind pipe, and multiple coal-char combustion devices are equal
On the even side wall for being arranged in the boiler, the first semicoke entrance of each coal-char combustion device is connect with primary wind pipe.
Preferably, the coal grading sub-prime for pulverized-coal fired boiler further includes screw conveyor using system, the spiral
Conveyer is provided with the first discharge and the second coal powder entrance, and the first coal dust of first discharge and said inner tube enters
Mouth connection.
Preferably, the coal grading sub-prime for pulverized-coal fired boiler further includes pulverized coal bin using system, the pulverized coal bin
Bottom is provided with the second discharge, and second discharge is connect with the second coal powder entrance of the screw conveyor.
Preferably, the high-temperature flue gas entry of the outer tube is connect with the boiler furnace outlet.
Preferably, the coal grading sub-prime for pulverized-coal fired boiler further includes gas burner using system, the combustion gas
Burner is provided with air intake, fuel gas inlet and high-temperature flue gas outlet, the fuel gas inlet of the gas burner and the oil
First gas outlet of air separation connects, the high-temperature flue gas of the high-temperature flue gas outlet of the gas burner and the outer tube
Entrance connection.
Preferably, the low-temperature flue gas outlet of the outer tube is connect with the back-end ductwork of the boiler.
Corresponding, the utility model also provides a kind of coal grading sub-prime for pulverized-coal fired boiler using method, including with
Lower step:
Coal dust in the pulverized coal bin is delivered in described by the screw conveyor with certain rate by step a1
High-temperature flue gas is passed through in the outer tube by Guan Zhong by the high-temperature flue gas entry, and heat occurs in said inner tube for the coal dust
Solution reaction generates pyrolysis gas and semicoke particle；
The pyrolysis gas and the semicoke particle are passed through in the semicoke separator by step a2, the pyrolysis gas and
The semicoke particle separates in the semicoke separator, and the pyrolysis gas isolated is passed through the high temperature filtration
In device, the semicoke particle isolated is passed through in the boiler furnace by primary wind pipe and is burnt；
Step a3, the high-temperature filter are filtered the thin semicoke powder in the pyrolysis gas, then will be after filtering
The pyrolysis gas is passed through the gas and oil separating plant；
Step a4, combustion gas and tar steam in the pyrolysis gas are separated in the gas and oil separating plant, are obtained
Combustion gas and tar.
Preferably, following steps are also executed after executing step a4: the part combustion gas is passed through the fuel gas buring
In device, combustion reaction occurs in the gas burner and generates high-temperature flue gas for the combustion gas and air, by the fuel gas buring
The part high-temperature flue gas that device generates is passed through in the outer tube by the high-temperature flue gas entry.
Preferably, following steps are also executed after executing step a2: the high temperature that will be generated in the boiler furnace of part
Flue gas is passed through in the outer tube by the high-temperature flue gas entry.
Preferably, following steps are also executed after executing step a1: the low-temperature flue gas exported in the outer tube is passed through
In the back-end ductwork of the boiler.
The utility model has the advantages that
The coal grading sub-prime for pulverized-coal fired boiler of the utility model is using system directly with the existing powder processed of pulverized-coal fired boiler
The coal dust of system production is raw material, and the semicoke particle fire behaviour of production is good, and the existing coal burner of pulverized-coal fired boiler is without warp
Crossing transformation can be used as coal-char combustion device, thus this system is small to the transformation of existing pulverized-coal fired boiler process system；Pulverized-coal fired boiler system
The coal powder size of powder system production at 100 μm hereinafter, pyrolytic reaction rate is big, imitate by the production of jacket type down-flow fluidized bed using ECT pyrolysis reactor
Rate is high, while the simple structure, convenient control of jacket type down-flow fluidized bed using ECT pyrolysis reactor, with lower cost recovery pyrolysis of coal generation
Combustion gas and tar resource, overall economic efficiency is high.
Detailed description of the invention
Fig. 1 is shown for the coal grading sub-prime for pulverized-coal fired boiler a kind of in the utility model embodiment 1 using the structure of system
It is intended to.
Fig. 2 is the structure that another coal grading sub-prime for pulverized-coal fired boiler utilizes system in the utility model embodiment 1
Schematic diagram.
Fig. 3 utilizes the flow chart of method for the coal grading sub-prime for pulverized-coal fired boiler a kind of in the utility model embodiment 1.
Fig. 4 is shown for the coal grading sub-prime for pulverized-coal fired boiler a kind of in the utility model embodiment 2 using the structure of system
It is intended to.
Specific embodiment
The following examples illustrate the utility model, but is not intended to limit the scope of the present invention.
Embodiment 1
As shown in Figure 1, it includes jacket type down-flow fluidized bed using ECT pyrolytic reaction that this, which is used for the coal grading sub-prime of pulverized-coal fired boiler using system,
Device 300, semicoke separator 400, high-temperature filter 500, gas and oil separating plant 600, boiler 800 and multiple coal-char combustion devices
700.In addition, in order to guarantee systems stay and convenient for controlling system work.In the present embodiment for pulverized-coal fired boiler
Coal grading sub-prime further includes screw conveyor 200 and pulverized coal bin 100 using system.
Pulverized coal bin 100 is the intermediate coal in common coal-burning power plant's coal dust preparation system for storing coal dust, pulverized coal bin 100
Powder cabin, the bottom of pulverized coal bin 100 are provided with the second discharge 110.
Screw conveyor 200 is for the coal dust in pulverized coal bin 100 to be delivered in inner tube with certain rate, helical feed
Machine 200 is provided with the first discharge 220 and the second coal powder entrance 210, the first coal of the first discharge 220 and inner tube 310
Powder entrance 330 connects, and the second discharge 110 of pulverized coal bin 100 is connect with the second coal powder entrance 210 of screw conveyor 200.
Jacket type down-flow fluidized bed using ECT pyrolysis reactor 300 includes inner tube 310 and the outer tube 320 for being sheathed on 310 periphery of inner tube, inner tube
310 top is provided with the first coal powder entrance 330, and the bottom of inner tube 310 is provided with the first pyrolysis gas and semicoke outlet 340.Outside
Pipe 320 is provided with high-temperature flue gas entry 350 and low-temperature flue gas outlet 360；Wherein high-temperature flue gas entry 350 is set to outer tube 320
Bottom, and tops that low-temperature flue gas outlet 360 is set to outer tube 320.Further, as shown in Fig. 2, in the present embodiment,
The high-temperature flue gas entry 350 of outer tube 320 is connect with 800 furnace outlet of boiler.Further, the low-temperature flue gas outlet of outer tube 320
360 connect with the back-end ductwork of boiler 800.
Semicoke separator 400 is used to separate pyrolysis gas and semicoke particle, and semicoke separator 400 is provided with the first heat
It vents one's spleen and semicoke entrance 410, the outlet 420 of the first semicoke and the first pyrolysis gas outlet 430, the first pyrolysis gas and semicoke entrance 410
It is connect with the first pyrolysis gas and semicoke outlet 340, the first semicoke outlet 420 is connect with primary wind pipe.Semicoke separator 400
It is in the present embodiment cyclone separator.
For high-temperature filter 500 for being filtered to the thin semicoke powder in pyrolysis gas, high-temperature filter 500 is provided with the
One pyrolysis gas entrance 510 and the second pyrolysis gas outlet 520.First pyrolysis gas entrance 510 of high-temperature filter 500 is separated with semicoke
First pyrolysis gas outlet 430 of device 400 connects.
Gas and oil separating plant 600 is used to make combustion gas and tar steam in pyrolysis gas to separate, gas and oil separating plant 600
It is provided with the second pyrolysis gas entrance 610, the first gas outlet 620 and the first tar outlet 630.The of gas and oil separating plant 600
Two pyrolysis gas entrances 610 are connect with the second pyrolysis gas outlet 520 of high-temperature filter 500.
Coal-char combustion device 700 is provided with the first semicoke entrance 710, and multiple coal-char combustion devices 700 are evenly arranged in boiler 800
Side wall on, the first semicoke entrance 710 of each coal-char combustion device 700 is connect with primary wind pipe, receive First air carrying
Semicoke particle, First air are air.
Working principle:
When system works, the coal dust in pulverized coal bin 100 is conveyed coal dust according to certain rate by screw conveyor 200
Into the inner tube 310 of jacket type down-flow fluidized bed using ECT pyrolysis reactor 300, high-temperature flue gas is passed through jacket type by high-temperature flue gas entry 350
In the outer tube 320 of down-flow fluidized bed using ECT pyrolysis reactor 300.Coal dust flows through the interior of jacket type down-flow fluidized bed using ECT pyrolysis reactor 300 from top to bottom
Pipe 310, and indirect heat exchange occurs with flue gas, due to coal powder size at 100 μm hereinafter, pulverized coal particle is brought rapidly up and occurs fast
Fast pyrolytic reaction, pulverized coal particle are precipitated volatile matter in a very short period of time, generate pyrolysis gas and semicoke particle, pyrolysis gas with CO,
H2、CH4Based on equal combustion gas and tar steam, the flow by controlling high-temperature flue gas realizes the control to pulverized coal pyrolysis temperature, thus
Control the yield of pyrolysis gas.Pyrolysis gas and semicoke particle are passed through in semicoke separator 400, and pyrolysis gas and semicoke particle are in semicoke
Separated in separator 400, the pyrolysis gas separated be passed through in high-temperature filter 500 further filter it is therein thin by half
Coke powder end, the pyrolysis gas by filtering are passed through gas and oil separating plant 600, and the combustion gas and tar steam in pyrolysis gas are in Oil-gas Separation
It is separated in device 600, obtains combustion gas and tar, combustion gas and tar can be further used for producing chemical products and oil product.Half
The semicoke particle that burnt separator 400 is separated is passed through in primary wind pipe, and semicoke particle is carried along into semicoke by First air
Burner 700 burns in 800 burner hearth of boiler, since semicoke grain graininess is smaller, and half generated after high temperature pyrolysis
Burnt particle has certain temperature, thus semicoke particle is easier to light, and will not change 800 combustion stability of boiler.In order to straight
It connects using the coal dust of the existing pulverized coal preparation system production of pulverized-coal fired boiler as raw material, the coal dust that pulverized-coal fired boiler coal dust preparation system produces is deposited
Storage is in pulverized coal bin 100.In order to utilize the existing high-temperature flue gas of pulverized-coal fired boiler in jacket type down-flow fluidized bed using ECT pyrolysis reactor 300
Pyrolytic reaction provides heat, and the high-temperature flue gas that the furnace outlet of a part of boiler 800 exports is passed through the pyrolysis of jacket type down-flow fluidized bed using ECT
In the outer tube 320 of reactor 300.It is low after temperature reduction in 300 outer tube 320 of jacket type down-flow fluidized bed using ECT pyrolysis reactor in order to recycle
Warm flue gas heat, and have flue gas system using pulverized-coal fired boiler and low-temperature flue gas is handled, jacket type down-flow fluidized bed using ECT is pyrolyzed anti-
The low-temperature flue gas after temperature reduces in the outer tube 320 of device 300 is answered to be passed through in the back-end ductwork of boiler 800.
As shown in figure 3, the utility model also provides a kind of coal grading sub-prime for pulverized-coal fired boiler using method, this method
The following steps are included:
Coal dust in pulverized coal bin 100 is delivered to inner tube 310 by screw conveyor 200 with certain rate by step a1
In, high-temperature flue gas is passed through in outer tube 320 by high-temperature flue gas entry 350, pyrolytic reaction generation occurs in inner tube 310 for coal dust
Pyrolysis gas and semicoke particle；
Before executing step a1, it is also necessary to execute following steps: the coal dust that pulverized-coal fired boiler coal dust preparation system is produced
It is stored in pulverized coal bin 100.The coal dust in pulverized coal bin 100 is delivered to inner tube with certain rate by screw conveyor 200
In 310, coal dust flows through the inner tube 310 of jacket type down-flow fluidized bed using ECT pyrolysis reactor 300 from top to bottom, and changes indirectly with flue gas generation
Heat, due to coal powder size at 100 μm hereinafter, pulverized coal particle be brought rapidly up and occur fast pyrogenation reaction, pulverized coal particle is extremely short
Time in volatile matter is precipitated, generate pyrolysis gas and semicoke particle, pyrolysis gas is with CO, H2、CH4Based on equal combustion gas and tar steam,
Flow by controlling high-temperature flue gas realizes the control to pulverized coal pyrolysis temperature, to control the yield of pyrolysis gas.
Pyrolysis gas and semicoke particle are passed through in semicoke separator 400 by step a2, and pyrolysis gas and semicoke particle are in semicoke
It is separated in separator 400, the pyrolysis gas isolated is passed through in high-temperature filter 500, the semicoke particle that will be isolated
It is passed through in 800 burner hearth of boiler and is burnt by primary wind pipe；
Semicoke particle is passed through primary wind pipe, and semicoke particle is passed through coal-char combustion device 700 by First air carrying, in boiler
It burns in 800 burner hearths, since semicoke grain graininess is smaller, and the semicoke particle generated after high temperature pyrolysis has centainly
Temperature, thus semicoke particle is easier to light, and will not change 800 combustion stability of boiler.
Step a3, high-temperature filter 500 are filtered the thin semicoke powder in pyrolysis gas, then by the rear pyrolysis gas of filtering
It is passed through gas and oil separating plant 600；
Step a4, combustion gas and tar steam in pyrolysis gas separate in gas and oil separating plant 600, obtain combustion gas and
Tar；
Combustion gas and tar can be further used for producing chemical products and oil product, by with lower cost recovery pyrolysis of coal production
Raw combustion gas and tar resource, effectively improves economic benefit.
Further, following steps are also executed after executing step a2: the high temperature that will be generated in 800 burner hearth of part boiler
Flue gas is passed through in outer tube 320 by high-temperature flue gas entry 350, gives jacket type down-flow fluidized bed using ECT using the existing high-temperature flue gas of pulverized-coal fired boiler
Pyrolytic reaction in pyrolysis reactor 300 provides heat, can efficiently use the existing high temperature of pulverized-coal fired boiler by implementing the step
Flue gas provides heat to the pyrolytic reaction in jacket type down-flow fluidized bed using ECT pyrolysis reactor 300, improves energy utilization rate.
Further, following steps are also executed after executing step a1: the low-temperature flue gas exported in outer tube 320 is passed through
In the back-end ductwork of boiler 800, by executing the step, 300 outer tube 320 of jacket type down-flow fluidized bed using ECT pyrolysis reactor can be effectively recycled
Low-temperature flue gas heat after middle temperature reduction, and have flue gas system using pulverized-coal fired boiler and low-temperature flue gas is handled.
The coal grading sub-prime for pulverized-coal fired boiler of the utility model utilizes method, directly with the existing powder processed of pulverized-coal fired boiler
The coal dust of system production is raw material, and the semicoke particle fire behaviour of production is good, and the existing coal burner of pulverized-coal fired boiler is without warp
Crossing transformation can be used as coal-char combustion device 700, thus this system is small to the transformation of existing pulverized-coal fired boiler process system；Pulverized-coal fired boiler
The coal powder size of pulverized coal preparation system production at 100 μm hereinafter, pyrolytic reaction rate is big, jacket type down-flow fluidized bed using ECT pyrolysis reactor 300
High production efficiency, while the simple structure, convenient control of jacket type down-flow fluidized bed using ECT pyrolysis reactor 300, with lower cost recovery
The combustion gas and tar resource that pyrolysis of coal generates, overall economic efficiency are high.
Embodiment 2
As shown in figure 4, the present embodiment is based on embodiment 1, difference from Example 1 is, in the present embodiment
Coal grading sub-prime for pulverized-coal fired boiler further includes gas burner 900 using system, and gas burner 900 is provided with air and enters
Mouth 910, fuel gas inlet 920 and high-temperature flue gas outlet 930, the fuel gas inlet 920 and gas and oil separating plant of gas burner 900
600 the first gas outlet 620 connection, the high-temperature flue gas outlet 930 of gas burner 900 and the high-temperature flue gas of outer tube 320 enter
Mouth 350 connects.
Correspondingly, the coal grading sub-prime for pulverized-coal fired boiler of the present embodiment is in the method in embodiment 1 using method
Method in basis, with embodiment 1 the difference is that, the coal grading sub-prime utilization side for pulverized-coal fired boiler in the present embodiment
Method also executes following steps after executing step a4: Some gases being passed through in gas burner 900, combustion gas and air are firing
Combustion reaction occurs in air burner 900 and generates high-temperature flue gas, the part high-temperature flue gas that gas burner 900 generates is passed through into height
Warm smoke inlet 350 is passed through in outer tube 320.The combustion gas that a part is produced can be fired with air by implementing the step
It burns reaction and generates high-temperature flue gas, provide heat to the pyrolytic reaction in jacket type down-flow fluidized bed using ECT pyrolysis reactor 300, improve energy benefit
With rate.
Although being above described in detail with generality explanation and specific embodiment to the utility model,
On the basis of the utility model, it can be modified or is improved, this is apparent to those skilled in the art
's.Therefore, these modifications or improvements on the basis of without departing from the spirit of the present invention, belong to the utility model and want
Seek the range of protection.
Claims (6)
1. a kind of coal grading sub-prime for pulverized-coal fired boiler utilizes system, the coal grading sub-prime for pulverized-coal fired boiler utilizes system
System includes jacket type down-flow fluidized bed using ECT pyrolysis reactor, semicoke separator, high-temperature filter, gas and oil separating plant, boiler and multiple
Coal-char combustion device, which is characterized in that the jacket type down-flow fluidized bed using ECT pyrolysis reactor includes inner tube and is sheathed on said inner tube periphery
Outer tube, be provided with the first coal powder entrance at the top of said inner tube, the bottom of said inner tube is provided with the first pyrolysis gas and semicoke
Outlet, the outer tube are provided with high-temperature flue gas entry and low-temperature flue gas outlet；The semicoke separator is provided with the first pyrolysis
Gas and semicoke entrance, the outlet of the first semicoke and the first pyrolysis gas outlet, first pyrolysis gas and semicoke entrance and described first
Pyrolysis gas and semicoke outlet connection, first pyrolysis gas outlet are connected by the high-temperature filter and the gas and oil separating plant
It connects, the first semicoke outlet is connect with primary wind pipe, and multiple coal-char combustion devices are evenly arranged in the side of the boiler
On wall, the first semicoke entrance of each coal-char combustion device is connect with primary wind pipe.
2. the coal grading sub-prime according to claim 1 for pulverized-coal fired boiler utilizes system, which is characterized in that described to be used for
The coal grading sub-prime of pulverized-coal fired boiler further includes screw conveyor using system, and the screw conveyor is provided with the first discharge
With the second coal powder entrance, the first coal powder entrance of first discharge and said inner tube is connected.
3. the coal grading sub-prime according to claim 2 for pulverized-coal fired boiler utilizes system, which is characterized in that described to be used for
The coal grading sub-prime of pulverized-coal fired boiler further includes pulverized coal bin using system, and the bottom of the pulverized coal bin is provided with the second discharge,
Second discharge is connect with the second coal powder entrance of the screw conveyor.
4. the coal grading sub-prime according to claim 3 for pulverized-coal fired boiler utilizes system, which is characterized in that the outer tube
High-temperature flue gas entry connect with the boiler furnace outlet.
5. the coal grading sub-prime according to claim 3 for pulverized-coal fired boiler utilizes system, which is characterized in that described to be used for
The coal grading sub-prime of pulverized-coal fired boiler further includes gas burner using system, and the gas burner is provided with air intake, combustion
Gas entrance and high-temperature flue gas outlet, the first gas outlet of the fuel gas inlet of the gas burner and the gas and oil separating plant
Connection, the high-temperature flue gas outlet of the gas burner are connect with the high-temperature flue gas entry of the outer tube.
6. the coal grading sub-prime according to claim 4 or 5 for pulverized-coal fired boiler utilizes system, which is characterized in that described
The low-temperature flue gas outlet of outer tube is connect with the back-end ductwork of the boiler.
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| CN108715766A (en) * | 2018-06-27 | 2018-10-30 | 北京清创晋华科技有限公司 | A kind of coal grading sub-prime for pulverized-coal fired boiler utilizes system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108715766A (en) * | 2018-06-27 | 2018-10-30 | 北京清创晋华科技有限公司 | A kind of coal grading sub-prime for pulverized-coal fired boiler utilizes system and method |
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