CN210735375U - Slag removal system of chain bucket conveyor and thermal power plant - Google Patents
Slag removal system of chain bucket conveyor and thermal power plant Download PDFInfo
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- CN210735375U CN210735375U CN201921643526.6U CN201921643526U CN210735375U CN 210735375 U CN210735375 U CN 210735375U CN 201921643526 U CN201921643526 U CN 201921643526U CN 210735375 U CN210735375 U CN 210735375U
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- slag
- bucket conveyor
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- relay
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Abstract
The utility model provides a slag removal system of chain bucket conveyor and thermal power factory belongs to the power plant equipment field to solve present device and appear the derailment accident easily in the use and influence the normal clear of arranging the sediment and have the problem of potential safety hazard. A motor control circuit in a control cabinet of a bucket conveyor is connected with a motor of a bucket conveyor body, a broken chain monitoring and protecting device is installed at the tail of the bucket conveyor body, two groups of guide wheel sets are installed at the lower part and the upper part of a climbing part of the bucket conveyor body and are positioned on the side face of a hopper of the bucket conveyor body, two deviation travel switches SQ1 and SQ2 are installed beside the two guide wheel sets, first and second emergency control buttons SQ3 and SQ4 are installed on a rack of the horizontal and climbing part of the bucket conveyor body, a blockage detecting device is installed at a blanking port of the bucket conveyor body, and the broken chain monitoring and protecting device, the SQ1 and SQ2, the SQ3, the SQ4 and the SQ5 of the blockage detecting device are connected in the motor control circuit in series.
Description
Technical Field
The utility model relates to a power plant equipment technical field especially relates to a bucket chain conveyor and thermal power factory's deslagging system.
Background
At present, the slag of a thermal power plant is conveyed out of a boiler room through a bucket chain conveyor. In order to meet the working requirements of a thermal power plant, the length of the bucket chain conveyor is relatively long, the bucket chain conveyor belongs to an overlong and gradient conveying system of the same type, and the integral conveying length of the bucket chain conveyor of a certain thermal power plant reaches 35.9 m. In the using process, the chain bucket type conveyor often produces accident slag discharge caused by separation from the track, and enterprises need to invest a large amount of manpower, material resources and financial resources to solve the problem.
In order to avoid derailment accidents of a bucket chain conveyor, a tensioning device is arranged at the tail part of the bucket chain conveyor at present, however, the tensioning device is only effective within a range of 5m taking the tail part as the center, the action range is small, and the reliability is low.
In conclusion, the prior bucket chain conveyor is easy to have derailment accidents in the using process, thereby not only influencing the normal operation of slag discharge, but also having certain potential safety hazards.
Disclosure of Invention
For solving present bucket chain conveyor derailment accident appears easily in the use and influence the normal clear of arranging the sediment and have the technical problem of certain potential safety hazard, the utility model provides a bucket chain conveyor and thermal power factory's deslagging system.
In order to solve the technical problem, the utility model discloses a technical scheme is:
the utility model provides a bucket chain conveyor, its includes bucket chain conveyor body, bucket chain conveyor switch board, broken chain monitoring protection device, two sets of direction wheelsets, two off tracking travel switch SQ1 and SQ2, first urgent control button SQ3, the urgent control button SQ4 of second and putty detection device, wherein: a motor control circuit in the control cabinet of the bucket conveyor is connected with a motor of the bucket conveyor body, a broken chain monitoring and protecting device is arranged at the tail part of the bucket conveyor body, two groups of guide wheel sets are respectively arranged at the lower part and the upper part of the climbing part of the bucket conveyor body, the two groups of guide wheel sets are positioned on the side face of a hopper of a bucket conveyor body, two deviation travel switches SQ1 and SQ2 are respectively installed beside the two guide wheel sets, a first emergency control button SQ3 and a second emergency control button SQ4 are respectively installed on a rack of a horizontal part and a climbing part of the bucket conveyor body, a blocking detection device is installed at a blanking port of the bucket conveyor body, and a broken chain monitoring protection device, the two deviation travel switches SQ1 and SQ2, the first emergency control button SQ3, the second emergency control button SQ4 and a blocking travel switch SQ5 of the blocking detection device are connected in series in a motor control circuit of the bucket conveyor control cabinet.
Optionally, the blockage detection device comprises a circular iron rod, an iron plate and a blockage stroke switch SQ5, the circular iron rod is fixedly connected with a blanking port of the bucket conveyor body, the iron plate is connected with the circular iron rod, and the blockage stroke switch SQ5 is fixed beside the iron plate.
Optionally, the motor control circuit comprises a main circuit and an auxiliary circuit, the main circuit at least comprises an isolating switch QF1 and a frequency conversion chip U, a three-phase input end of the isolating switch QF1 is connected with three-phase alternating current, a three-phase output end of the isolating switch QF1 is connected with a three-phase input end of the frequency conversion chip U, and a three-phase output end of the frequency conversion chip U is connected with the motor M1 of the bucket conveyor body; the auxiliary loop at least comprises a fuse PU, a first emergency control button SQ3, a second emergency control button SQ4, a material blocking travel switch SQ5, deviation travel switches SQ1 and SQ2, a local/remote changeover switch SA, a stop button SB1, a start button SB2, a relay KA1, a relay KA2, a remote start-stop switch K1 and a relay KA3, wherein: the fuse PU, the first emergency control button SQ3, the second emergency control button SQ4, the blocking travel switch SQ5, the deviation travel switches SQ1 and SQ2 are sequentially connected in series and then connected with a contact 1 of the local/remote changeover switch SA, one end of the stop button SB1 is connected with a contact 4 of the local/remote changeover switch SA, the other end of the stop button SB1 is connected with the start button SB2, the stop button SB1, the start button SB2 and a coil of the relay KA1 are connected in series and then form a local start-stop control loop, one end of the remote start-stop switch K1 is connected with a contact 2 of the local/remote changeover switch SA, one normally open contact of the remote start-stop switch K1 and the relay KA3 and a coil of the relay KA2 are connected in series and then form a remote start-stop control loop, the two ends of one normally open contact of the relay KA1 are respectively connected with two ends of the start button SB 8, two ends of another normally open contact of the relay KA1 are respectively connected with a pin 5 and a pin 9 of the frequency conversion chip U, two ends of one normally open contact of the relay KA2 are respectively connected with the pin 5 and the pin 9 of the frequency conversion chip U, two ends of another normally open contact of the relay KA2 are respectively connected with a pin 6 and a pin 9 of the frequency conversion chip U, and two ends of another normally open contact of the relay KA2 are respectively connected with two ends of a remote start-stop switch K1.
The utility model provides a deslagging system of thermal power factory, includes above-mentioned chain bucket conveyor, still includes at least one cold sediment ware, bucket elevator, sediment storehouse and slag transfer passage, wherein: the slag inlet of at least one slag cooler is connected with the slag outlet of the boiler, the slag outlet of at least one slag cooler is communicated with the chain bucket conveyor, the slag outlet of the chain bucket conveyor is connected with the slag inlet of the bucket elevator, the slag outlet of the bucket elevator is connected with the slag bin, the slag inlet of the slag conveying channel is connected with the slag outlet of the slag bin, the slag outlet of the slag conveying channel is used for being in butt joint with a slag conveying device, the slag conveying channel is provided with a pneumatic dome valve and an electric feeder, and the slag bin is provided with a bag-type dust collector and a pressure vacuum release valve.
Optionally, the number of the slag coolers is four.
The utility model has the advantages that:
through setting up broken chain monitoring protection device, two sets of direction wheelsets, two off tracking travel switch SQ1 and SQ2, first urgent control button SQ3, second urgent control button SQ4 and putty detection device isotructure, the chain break trouble that provides one kind and can in time discover bucket conveyor body, the bucket conveyor of off tracking trouble and putty trouble, and can control the bucket conveyor to shut down nearby when breaking down, ensure that the derailment accident and the trouble of different positions in the bucket conveyor operation process can in time be discovered, high reliability, not only can guarantee the normal clear of sediment, and the potential safety hazard in the bucket conveyor operation process has been reduced. Through the deslagging system of the thermal power plant with the chain bucket conveyor, deslagging production can be smoothly carried out.
Drawings
Fig. 1 is a schematic structural diagram of a bucket chain conveyor according to the present invention.
Fig. 2 is a schematic structural diagram of the blockage detection device in fig. 1.
Fig. 3 is a schematic diagram of a configuration of a motor control circuit of the bucket conveyor.
Fig. 4 is a schematic diagram of the composition structure of the main circuit in fig. 3.
Fig. 5 is a schematic diagram of the structure of the auxiliary circuit in fig. 3.
Fig. 6 is a schematic structural diagram of a deslagging system of a thermal power plant provided by the utility model.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the bucket conveyor in this embodiment includes a bucket conveyor body 1, a bucket conveyor control cabinet 2, a broken chain monitoring and protecting device 3, two sets of guide wheel sets 4, two deviation travel switches SQ1 and SQ2, a first emergency control button SQ3, a second emergency control button SQ4, and a blockage detecting device 5, wherein: a motor control circuit in the bucket conveyor control cabinet 2 is connected with a motor of a bucket conveyor body 1, a broken chain monitoring and protecting device 3 is installed at the tail of the bucket conveyor body 1, two groups of guide wheel sets 4 are respectively installed at the lower part and the upper part of a climbing part of the bucket conveyor body 1 through connecting pieces such as screws, the two groups of guide wheel sets 4 are located at the side surface of a hopper of the bucket conveyor body 1, two deviation travel switches SQ1 and SQ2 are respectively installed beside the two guide wheel sets 4 through screws, a first emergency control button SQ3 and a second emergency control button SQ4 are respectively installed on a rack of a horizontal part and the climbing part of the bucket conveyor body 1 through screws, a blocking material detecting device 5 is installed at a blanking port of the bucket conveyor body 1, the broken chain monitoring and protecting device 3, the two deviation travel switches SQ1 and SQ2, a first emergency control button SQ3, a second emergency control button SQ4 and a third, The second emergency control button SQ4 and the material jam travel switch SQ5 of the material jam detecting device 5 are connected in series in the motor control circuit of the bucket conveyor control cabinet 2.
The utility model discloses when using, broken chain monitoring protection device 3 is used for monitoring whether chain break phenomenon takes place for bucket conveyor body 1, if, then broken chain monitoring protection device 3 carries out the protection action, makes motor control circuit control bucket conveyor body 1's motor stall. The two groups of guide wheel sets 4 are used for guiding and detecting whether the hopper of the bucket conveyor body 1 deviates in a climbing process, if the hopper of the bucket conveyor body 1 deviates in a moving process and deviates to touch the guide wheel sets 4, the guide wheel sets 4 deviate to trigger deviation travel switches SQ1 or SQ2 to act, and the deviation travel switches SQ1 or SQ2 act to enable the motor control circuit to control the motor of the bucket conveyor body 1 to stop rotating. The blockage detection device 5 is used for monitoring whether a blanking port of the bucket conveyor body 1 is blocked or not, and if so, the blockage travel switch SQ5 is triggered to act to enable the motor control circuit to control the motor of the bucket conveyor body 1 to stop rotating. The first emergency control button SQ3 and the second emergency control button SQ4 function as emergency stops, and measures are taken to stop the bucket conveyor body 1 as soon as abnormal friction sound is found in the on-site inspection process according to the nearest position of the emergency button.
Optionally, the bucket conveyor further comprises a tensioning device, and the tensioning device is mounted at the tail of the bucket conveyor body 1. The specific structure of the tensioning device can be seen in the structure of the tensioning device in the relevant conveyor.
Optionally, as shown in fig. 2, the blockage detection device 5 includes a circular iron rod 5-1, an iron plate 5-2, and a blockage stroke switch SQ5, the circular iron rod 5-1 is fixedly connected to the blanking port of the bucket conveyor body 1, the iron plate 5-2 is connected to the circular iron rod 5-1, the blockage stroke switch SQ5 is fixed beside the iron plate 5-2, and the blockage stroke switch SQ5 is located in a stroke range in which the iron plate 5-2 rotates around the circular iron rod 5-1. When the blanking port of the bucket conveyor body 1 is blocked, the material accumulated at the blocking port presses the iron plate 5-2, so that the iron plate 5-2 rotates around the circular iron rod 5-1 within a certain range, and when the iron plate 5-2 moves to touch the blocking travel switch SQ5, the blocking travel switch SQ5 is triggered to act, so that the motor of the bucket conveyor body 1 is controlled by the motor control circuit to stop rotating.
Alternatively, as shown in fig. 3 to 5, the motor control circuit includes a main circuit and an auxiliary circuit, the main circuit includes at least an isolating switch QF1 and a frequency conversion chip U (siemens MM440 frequency converter), a three-phase input end of the isolating switch QF1 is connected with three-phase alternating current, a three-phase output end of the isolating switch QF1 is connected with a three-phase input end of the frequency conversion chip U, and a three-phase output end of the frequency conversion chip U is connected with the motor M1 of the bucket conveyor body 1; the auxiliary loop at least comprises a fuse PU, a first emergency control button SQ3, a second emergency control button SQ4, a material blocking travel switch SQ5, deviation travel switches SQ1 and SQ2, a local/remote changeover switch SA, a stop button SB1, a start button SB2, a relay KA1, a relay KA2, a remote start-stop switch K1 and a relay KA3, wherein: the fuse PU, the first emergency control button SQ3, the second emergency control button SQ4, the blocking travel switch SQ5, the deviation travel switches SQ1 and SQ2 are sequentially connected in series and then connected with a contact 1 of the local/remote changeover switch SA, one end of the stop button SB1 is connected with a contact 4 of the local/remote changeover switch SA, the other end of the stop button SB1 is connected with the start button SB2, the stop button SB1, the start button SB2 and a coil of the relay KA1 are connected in series and then form a local start-stop control loop, one end of the remote start-stop switch K1 is connected with a contact 2 of the local/remote changeover switch SA, one normally open contact of the remote start-stop switch K1 and the relay KA3 and a coil of the relay KA2 are connected in series and then form a remote start-stop control loop, the two ends of one normally open contact of the relay KA1 are respectively connected with two ends of the start button SB 8, two ends of another normally open contact of the relay KA1 are respectively connected with a pin 5 and a pin 9 of the frequency conversion chip U, two ends of one normally open contact of the relay KA2 are respectively connected with the pin 5 and the pin 9 of the frequency conversion chip U, two ends of another normally open contact of the relay KA2 are respectively connected with a pin 6 and a pin 9 of the frequency conversion chip U, and two ends of another normally open contact of the relay KA2 are respectively connected with two ends of a remote start-stop switch K1.
In addition, the main circuit also comprises a fan motor loop. The auxiliary loop also comprises a fan motor loop, an operation display loop, a main machine fault loop and a broken link alarm loop. The specific circuit composition of these loops can be seen in fig. 3, 4 and 5, which will not be described in detail in this embodiment.
With reference to fig. 3 to 5, the present invention has the following specific processes in the using process:
(1) in the process of in-situ inspection, if the bucket conveyor body 1 finds abnormal friction sound, after the first emergency control button SQ3 or the second emergency control button SQ4 is started according to the nearest accident button position, the 601/602 contact or 602/603 contact in the figure 5 is disconnected, so that after a normally closed circuit is disconnected, the coil of the relay KA1 or the relay KA2 loses power to enable the relay to act, the frequency converter control circuit 24/25 is disconnected, and the frequency converter trips to enable the motor M1 of the bucket conveyor body 1 to stop working.
(2) If a head blanking port is blocked during operation of the bucket conveyor body 1, an iron plate 5-2 in the blockage detection device 5 is inevitably extruded along with material accumulation, the blockage travel switch SQ5 is triggered to a certain degree by extrusion, a switch contact 603/604 in the figure 5 is disconnected in a loop, after a normally closed loop is disconnected, a coil of a relay KA1 or a relay KA2 loses power to enable the relay to act, a frequency converter control loop 24/25 is disconnected, and the frequency converter trips to enable a motor M1 of the bucket conveyor body 1 to stop working.
(3) When the upper part or the lower part of a climbing position in operation is flat, a guide wheel set 4 controls the range of the climbing position, if accidents happen after long-time running deviation wheels are abraded, deviation travel switches SQ1 and SQ2 are used as backup protection, if a chain deviates to a certain degree, a switch contact 604/605 or 605/606 loop in the figure 5 is disconnected, after a normally closed loop is disconnected, a coil of a relay KA1 or a relay KA2 loses power to enable the relay to act, a frequency converter control loop 24/25 is disconnected, and the frequency converter trips to enable a motor M1 of the bucket chain conveyor body 1 to stop working.
As shown in fig. 6, the utility model also provides a deslagging system of thermal power factory, it includes above-mentioned chain bucket conveyor 11, an at least cold sediment ware 12, bucket elevator 13, slag bin 14 and slag transfer passage 15, wherein: the slag inlet of at least one slag cooler 12 is connected with the slag outlet of the boiler 10, the slag outlet of at least one slag cooler 12 is communicated with the bucket chain conveyor 11, the slag outlet of the bucket chain conveyor 11 is connected with the slag inlet of the bucket elevator 13, the slag outlet of the bucket elevator 13 is connected with the slag bin 14, the slag inlet of the slag conveying channel 15 is connected with the slag outlet of the slag bin 14, the slag outlet of the slag conveying channel 15 is used for being in butt joint with a slag conveying device, the slag conveying channel 15 is provided with a pneumatic dome valve 16 and an electric feeder 17, and a bag-type dust remover 18 and a pressure vacuum release valve 19 are arranged on the slag bin 14.
Optionally, the number of the slag coolers 12 is four. The slag cooler 12 is a drum type.
The utility model discloses when using, boiler 10 exhaust slag is behind cold sediment ware 12 coolings, is sent out the boiler room by chain bucket conveyor 11 outside, again through bucket elevator 13 vertical lifting input sediment storehouse 14, sediment storehouse 14 arranges by the boiler room, and every stove sets up one. A dry slag conveying channel and a wet slag conveying channel 15 are arranged below each slag bin 14; a slag conveying automobile channel is reserved below the slag bin 14, and the automobile can be used comprehensively by conveying slag in the slag bin chamber and conveying the slag out to an ash storage field for rolling and storage. The whole set of system realizes automatic program control through a local control cabinet and is provided with a hard-wired interface for remote monitoring of a DCS. The pneumatic dome valve 16 is used for controlling the opening and closing of the slag transport passage 15, and the electric feeder 17 is used for transporting slag into the slag transport device.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (5)
1. The utility model provides a chain bucket conveyor, its characterized in that includes chain bucket conveyor body (1), chain bucket conveyor switch board (2), broken chain monitoring protection device (3), two sets of direction wheelset (4), two off tracking travel switch SQ1 and SQ2, first urgent control button SQ3, second urgent control button SQ4 and putty detection device (5), wherein:
a motor control circuit in the control cabinet (2) of the chain bucket conveyor is connected with a motor of the chain bucket conveyor body (1), a broken chain monitoring and protecting device (3) is installed at the tail of the chain bucket conveyor body (1), two groups of guide wheel sets (4) are installed at the lower part and the upper part of a climbing part of the chain bucket conveyor body (1) respectively, the two groups of guide wheel sets (4) are located on the side surface of a hopper of the chain bucket conveyor body (1), two deviation travel switches SQ1 and SQ2 are installed beside the two guide wheel sets (4) respectively, a first emergency control button SQ3 and a second emergency control button SQ4 are installed on a rack of a horizontal part and a rack of the climbing part of the chain bucket conveyor body (1) respectively, a blockage detecting device (5) is installed at a material falling port of the chain bucket conveyor body (1), the broken chain monitoring and protecting device (3), the two deviation travel switches SQ1 and SQ2, The first emergency control button SQ3, the second emergency control button SQ4 and the material blockage stroke switch SQ5 of the material blockage detection device (5) are connected in series in a motor control circuit of the bucket conveyor control cabinet (2).
2. The chain bucket conveyor according to claim 1, wherein the blockage detection device (5) comprises a circular iron rod (5-1), an iron plate (5-2) and a blockage stroke switch SQ5, the circular iron rod (5-1) is fixedly connected with a blanking port of the chain bucket conveyor body (1), the iron plate (5-2) is connected with the circular iron rod (5-1), and the blockage stroke switch SQ5 is fixed beside the iron plate (5-2).
3. The bucket conveyor according to claim 1 or 2, wherein the motor control circuit comprises a main circuit and an auxiliary circuit, the main circuit comprises at least an isolating switch QF1 and a variable frequency chip U, a three-phase input end of the isolating switch QF1 is connected with three-phase alternating current, a three-phase output end of the isolating switch QF1 is connected with a three-phase input end of the variable frequency chip U, and a three-phase output end of the variable frequency chip U is connected with the motor M1 of the bucket conveyor body (1); the auxiliary loop at least comprises a fuse PU, a first emergency control button SQ3, a second emergency control button SQ4, a material blocking travel switch SQ5, deviation travel switches SQ1 and SQ2, a local/remote changeover switch SA, a stop button SB1, a start button SB2, a relay KA1, a relay KA2, a remote start-stop switch K1 and a relay KA3, wherein: the fuse PU, the first emergency control button SQ3, the second emergency control button SQ4, the blocking travel switch SQ5, the deviation travel switches SQ1 and SQ2 are sequentially connected in series and then connected with a contact 1 of the local/remote changeover switch SA, one end of the stop button SB1 is connected with a contact 4 of the local/remote changeover switch SA, the other end of the stop button SB1 is connected with the start button SB2, the stop button SB1, the start button SB2 and a coil of the relay KA1 are connected in series and then form a local start-stop control loop, one end of the remote start-stop switch K1 is connected with a contact 2 of the local/remote changeover switch SA, one normally open contact of the remote start-stop switch K1 and the relay KA3 and a coil of the relay KA2 are connected in series and then form a remote start-stop control loop, the two ends of one normally open contact of the relay KA1 are respectively connected with two ends of the start button SB 8, two ends of another normally open contact of the relay KA1 are respectively connected with a pin 5 and a pin 9 of the frequency conversion chip U, two ends of one normally open contact of the relay KA2 are respectively connected with the pin 5 and the pin 9 of the frequency conversion chip U, two ends of another normally open contact of the relay KA2 are respectively connected with a pin 6 and a pin 9 of the frequency conversion chip U, and two ends of another normally open contact of the relay KA2 are respectively connected with two ends of a remote start-stop switch K1.
4. Deslagging system for thermal power plants, comprising a bucket conveyor (11) according to any one of claims 1 to 3, characterized in that it further comprises at least one slag cooler (12), a bucket elevator (13), a slag silo (14) and a slag conveying channel (15), in which:
the slag inlet of at least one slag cooler (12) is connected with the slag outlet of a boiler (10), the slag outlet of at least one slag cooler (12) is communicated with a bucket chain conveyor (11), the slag outlet of the bucket chain conveyor (11) is connected with the slag inlet of a bucket chain elevator (13), the slag outlet of the bucket chain elevator (13) is connected with a slag bin (14), the slag inlet of a slag conveying channel (15) is connected with the slag outlet of the slag bin (14), the slag outlet of the slag conveying channel (15) is used for being in butt joint with a slag conveying device, the slag conveying channel (15) is provided with a pneumatic dome valve (16) and an electric feeder (17), and a bag-type dust collector (18) and a pressure vacuum release valve (19) are arranged above the slag bin (14).
5. Slag removal system according to claim 4, characterized in that the number of slag coolers (12) is four.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921643526.6U CN210735375U (en) | 2019-09-29 | 2019-09-29 | Slag removal system of chain bucket conveyor and thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921643526.6U CN210735375U (en) | 2019-09-29 | 2019-09-29 | Slag removal system of chain bucket conveyor and thermal power plant |
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| CN210735375U true CN210735375U (en) | 2020-06-12 |
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| CN201921643526.6U Expired - Fee Related CN210735375U (en) | 2019-09-29 | 2019-09-29 | Slag removal system of chain bucket conveyor and thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110550413A (en) * | 2019-09-29 | 2019-12-10 | 中煤大同能源有限责任公司 | Slag removal system of chain bucket conveyor and thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110550413A (en) * | 2019-09-29 | 2019-12-10 | 中煤大同能源有限责任公司 | Slag removal system of chain bucket conveyor and thermal power plant |
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