CN110173703B

CN110173703B - Coal cinder cleaning device for thermal power plant

Info

Publication number: CN110173703B
Application number: CN201910415043.9A
Authority: CN
Inventors: 李玮; 王国金; 贾长武; 倪培林; 周恩浩; 田润平
Original assignee: Datang Dongying Power Generation Co Ltd
Current assignee: Datang Dongying Power Generation Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-07-24
Anticipated expiration: 2039-05-17
Also published as: CN110173703A

Abstract

The invention discloses a cinder cleaning device for a thermal power plant, which comprises a cinder collecting shell, a discharging shell, a crushing roller and a microprocessor, wherein the cinder collecting shell comprises: the cinder is collected the inside fixed two cylindrical collecting chambers of having seted up of shell, the chamber of gathering materials is used for collecting the cinder waste material, the cinder is collected the shell and is located and gathers materials chamber bottom one side and offer the feed opening that is used for discharging the cinder, the cinder is collected the shell lower surface and is had two receipts material motors through screw fixed mounting, receive material motor and microprocessor signal end electric connection, the fixed welding of receipts material motor power take off has the receipts flitch. According to the invention, the coal slag can be concentrated in the collecting cavity, and then the coal slag is pushed to the discharging port by the receiving plate in the collecting cavity, and the collecting cavity is cylindrical, so that the receiving plate can be just matched with the inner wall of the collecting cavity when rotating, and the receiving plate can completely clean the coal slag in the collecting cavity, thereby avoiding incomplete cleaning of the coal slag.

Description

Coal cinder cleaning device for thermal power plant

Technical Field

The invention relates to the technical field of accessories of coal-fired steam boilers, in particular to a coal slag cleaning device for a thermal power plant.

Background

Thermal power generation is a power generation mode which utilizes heat energy generated by combustible materials during combustion and converts the heat energy into electric energy through a power generation power device; there are three types of energy conversion processes in thermal power generation: the fuel chemical energy-steam heat energy-mechanical energy-electric energy is that the fuel is utilized to generate heat and heat water to form high-temperature high-pressure superheated steam, then the steam enters a steam turbine along a pipeline to continuously expand and do work to impact a steam turbine rotor to rotate at a high speed so as to drive a generator rotor (electromagnetic field) to rotate, a stator coil cuts magnetic lines of force to generate electric energy, and then the electric energy is boosted to system voltage by utilizing a boosting transformer to be connected with a system in a grid mode and is transmitted outwards. Finally, the cooled steam is further boosted by a feed pump and sent back to the boiler to repeatedly participate in the circulation process; among them, a place for burning fuel is a boiler, and the boiler generates a large amount of coal slag during the process of burning fuel.

However, the conventional coal cinder cleaning device has some disadvantages in the using process, such as:

traditional cinder cleaning device is gone on by deashing equipment mostly, but traditional deashing equipment appears clearing up unclean condition easily when clearing up the cinder of cold cinder fill inside, and the deashing equipment can't clear away totally to the cinder of cold cinder fill corner region, leads to still remain more cinder after the inside clearance of cold cinder fill.

Disclosure of Invention

The invention aims to provide a coal slag cleaning device for a thermal power plant, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a coal cinder cleaning device for thermal power plant, collects shell, ejection of compact shell, crushing roller and microprocessor including the coal cinder: two cylindrical material collecting cavities are fixedly arranged in the coal cinder collecting shell and are used for collecting coal cinder waste materials, a feed opening for discharging the coal cinder is arranged on one side of the coal cinder collecting shell, which is positioned at the bottom of the aggregate cavity, two material collecting motors are fixedly arranged on the lower surface of the cinder collecting shell through screws, the material collecting motors are electrically connected with signal ends of the microprocessor, a material receiving plate is fixedly welded at the power output end of the material receiving motor and is arranged in the material collecting cavity, the coal slag collecting plate is used for pushing the coal slag in the collecting cavity to the discharging opening, the coal slag collecting shell is fixedly welded at the bottom of the discharging opening and is provided with a discharging shell, the discharging shell is communicated with the material collecting cavity through a feed opening, a conveying belt is arranged at the bottom of the discharging shell in an inclined upward direction, the conveying belt is electrically connected with a signal end of the microprocessor and is used for conveying coal cinder falling from the inside of the discharging shell.

Further, the method also comprises the following steps: the crushing roller, the crushing roller rotates to be installed ejection of compact shell top inner wall, the crushing roller is provided with two, the crushing roller is used for carrying out the breakage to large granule cinder, ejection of compact shell top outer wall has crushing motor through screw fixed mounting, crushing motor and microprocessor signal end electric connection, crushing roller fixed mounting is at crushing motor power take off end, crushing motor is used for driving the crushing roller and rotates.

Further, the method also comprises the following steps: the fixed welding in crushing roller surface has the arch, the crushing roller is broken large granule cinder through protruding.

Further, the method also comprises the following steps: the conveying outlet is fixedly arranged on one side wall of the bottom of the discharging shell, the opening width of the conveying outlet is the same as the width of the conveying belt, and the opening direction of the conveying outlet is the same as the conveying direction of the conveying belt.

Further, the method also comprises the following steps: the device comprises a conveyor belt, barrier strips, a baffle plate and a baffle plate, wherein the barrier strips are equidistantly installed on the surface of the conveyor belt through screws and are used for preventing coal cinder from rolling downwards on the surface of the conveyor belt.

Further, the method also comprises the following steps: the cooling plate is uniformly welded on the inner wall of the top of the cinder collecting shell, the cooling plate is respectively welded on two sides of the cinder collecting shell, and the cooling plate is obliquely arranged downwards.

Further, the method also comprises the following steps: the shower nozzle, the shower nozzle passes through screw fixed mounting at the cooling plate lower surface, the shower nozzle is used for watering to the cooling plate upper surface of its below, the metal water pipe is installed to the shower nozzle end of intaking, the metal water pipe is used for carrying the water that sprays to the shower nozzle, shell one side outer wall is collected to the cinder has the water pump through screw fixed mounting, water pump and microprocessor signal end electric connection, the shower nozzle passes through the metal water pipe and goes out water end through link up with the water pump.

Further, the method also comprises the following steps: the filter mantle, the filter mantle passes through hose through connection and holds at the water pump is intake, the filter mantle is used for filtering the water that gets into the water pump, the filter mantle is placed in the inside aquatic of cold sediment fill.

Further, the method also comprises the following steps: the temperature sensor is fixedly installed on the lower surface of the cooling plate through screws and is electrically connected with a signal end of the microprocessor, and the temperature sensor is used for monitoring the temperature of the cooling plate.

Further, the method also comprises the following steps: the collecting hopper is fixedly welded to the top of the cinder collecting shell and used for collecting and guiding cinder falling from the boiler to enter the cinder collecting shell.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the coal slag can be concentrated in the collecting cavity, and then the coal slag is pushed to the discharging port by the receiving plate in the collecting cavity, and the collecting cavity is cylindrical, so that the receiving plate can be just matched with the inner wall of the collecting cavity when rotating, and the receiving plate can completely clean the coal slag in the collecting cavity, thereby avoiding incomplete cleaning of the coal slag.

Drawings

FIG. 1 is a schematic structural diagram of a main view of a product of an embodiment of a coal slag cleaning device for a thermal power plant of the present invention;

FIG. 2 is a schematic top sectional view of a coal slag cleaning device for a thermal power plant in the embodiment of FIG. 1;

FIG. 3 is a schematic sectional view of a thermal power plant coal slag cleaning device in the embodiment of FIG. 1;

fig. 4 is a schematic diagram of an electrical connection structure of a coal slag cleaning device for a thermal power plant in the embodiment of fig. 1.

In FIGS. 1-4: 1-collecting coal slag; 2-a crushing motor; 3-discharging the outer shell; 4-a conveyor belt; 5-barrier strips; 6-a filter cover; 7-a material receiving motor; 8-a water pump; 9-metal water pipe; 10-a collection hopper; 11-a material receiving plate; 12-a crushing roller; 13-a material collecting cavity; 14-a feed opening; 15-a delivery outlet; 16-a cooling plate; 17-a temperature sensor; 18-a spray head; 19-a microprocessor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a coal cinder cleaning device for thermal power plant which characterized in that collects shell 1, ejection of compact shell 3, crushing roller 12 and microprocessor 19 including the coal cinder: the coal slag collecting shell 1 is fixedly provided with two cylindrical collecting cavities 13 inside, the collecting cavities 13 are used for collecting coal slag waste materials, the coal slag collecting shell 1 is positioned at one side of the bottom of the collecting cavity 13 and is provided with a feed opening 14 used for discharging coal slag, the lower surface of the coal slag collecting shell 1 is fixedly provided with two material receiving motors 7 through screws, each material receiving motor 7 adopts a motor with the model number of Y160M2-2, each material receiving motor 7 is electrically connected with a signal end of a microprocessor 19, a material receiving plate 11 is fixedly welded at the power output end of each material receiving motor 7, each material receiving plate 11 is arranged inside the corresponding collecting cavity 13, each material receiving plate 11 is used for pushing the coal slag inside the corresponding collecting cavity 13 to the corresponding feed opening 14, the coal slag collecting shell 1 is positioned at the bottom of the corresponding feed opening 14 and is fixedly welded with a discharge shell 3, and the discharge shell 3 is communicated with the corresponding collecting cavity 13 through, the bottom of the discharging shell 3 is obliquely and upwards provided with a conveyor belt 4, the conveyor belt 4 is a heat-resistant conveyor belt with the model of NN-350, the conveyor belt 4 is electrically connected with a signal end of the microprocessor 19, and the conveyor belt 4 is used for transmitting coal cinder falling from the inside of the discharging shell 3.

The crushing rollers 12 are rotatably arranged on the inner wall of the top of the discharging shell 3, the number of the crushing rollers 12 is two, the distance between the two crushing rollers 12 is 3 cm to 5 cm, the crushing rollers 12 are used for crushing large-particle coal cinder, the outer wall of the top of the discharging shell 3 is fixedly provided with a crushing motor 2 through screws, the crushing motor 2 adopts a motor with the model of Y315S-2, the crushing motor 2 is electrically connected with a signal end of a microprocessor 19, the crushing rollers 12 are fixedly arranged at the power output end of the crushing motor 2, the crushing motor 2 is used for driving the crushing rollers 12 to rotate, the microprocessor 19 is used for controlling the crushing motor 2 to work when in use, the two crushing rollers 12 are driven by the crushing motor 2 to rotate simultaneously, and after the coal cinder enters the discharging shell 3 through a discharging opening 14, the coal cinder can fall between the two crushing rollers 12, smaller coal slag particles fall from a gap between the two crushing rollers 12, while the secondary coal slag with larger particle size is extruded by the crushing rollers 12, and the coal slag does not fall until the particle size of the coal slag is extruded to the same distance with the crushing rollers 12; the surface of the crushing roller 12 is fixedly welded with the bulges, and the crushing roller 12 crushes large-particle coal cinder through the bulges, so that the crushing effect of the crushing roller 12 on the coal cinder is better; the conveying outlet 15 is fixedly arranged on one side wall of the bottom of the discharging shell 3, the width of the conveying outlet 15 is the same as that of the conveying belt 4, the direction of the conveying outlet 15 is the same as the conveying direction of the conveying belt 4, so that the coal cinder falling from the crushing roller 12 can be blocked by the discharging shell 3, the coal cinder is prevented from falling from the conveying belt 4, and meanwhile, the conveying outlet 15 is arranged on one side of the conveying direction of the conveying belt 14, so that the coal cinder in the discharging shell 3 can pass through the conveying outlet 15 and can be taken away by the conveying belt 4; the blocking strips 5 are equidistantly arranged on the surface of the conveyor belt 4 through screws, and the blocking strips 5 are used for preventing the coal cinder from rolling downwards on the surface of the conveyor belt 4, so that the coal cinder can be stably arranged on the upper surface of the conveyor belt when being conveyed by the conveyor belt 4, and the coal cinder is prevented from falling off from the surface of the conveyor belt 4 in the conveying process; the cooling plates 16 are uniformly welded on the inner wall of the top of the cinder collecting shell 1, the cooling plates 16 are respectively welded on two sides of the cinder collecting shell 1, and the cooling plates 16 are obliquely arranged downwards, so that cinder can conveniently drop on the cooling plates 16 step by step, the dropping time of the cinder is longer, the cinder has more time for cooling, and the cinder with higher temperature is prevented from damaging the conveyor belt 4; the spray head 18 is fixedly arranged on the lower surface of the cooling plate 16 through screws, the spray head 18 is used for spraying water on the upper surface of the cooling plate 16 below the spray head 18, a metal water pipe 9 is arranged at the water inlet end of the spray head 18, the metal water pipe 9 is used for conveying spraying water to the spray head 18, a water pump 8 is fixedly arranged on the outer wall of one side of the cinder collecting shell 1 through screws, the water pump 8 is an NN-350 type water pump, the water pump 8 is electrically connected with a signal end of a microprocessor 19, the spray head 18 is in through connection with the water outlet end of the water pump 8 through the metal water pipe 9, the water is conveniently sprayed on the cooling plate 16 through the water pump 8, and when the cinder rolls on the cooling plate 16, the cinder can be further cooled by the water, so that the cooling speed; the filter cover 6 is connected to the water inlet end of the water pump 8 through a hose in a penetrating manner, the filter cover 6 is used for filtering water entering the water pump 8, and the filter cover 6 is placed in the water in the cold slag hopper, so that the blockage caused by impurities in the water when the water is pumped by the water pump 8 is avoided; the temperature sensor 17 is fixedly mounted on the lower surface of the cooling plate 16 through screws, the temperature sensor 17 is a 602F-3500F temperature sensor, the temperature sensor 17 is electrically connected with a signal end of the microprocessor 19, the temperature sensor 17 is used for monitoring the temperature of the cooling plate 16, a user can conveniently monitor the temperature of the cooling plate 16 in real time by using the temperature sensor 17, when cinder falls on the cooling plate 16, the temperature of the cooling plate 16 rises, when the temperature sensor 17 detects that the temperature of the cooling plate 16 exceeds 100 ℃, the microprocessor 19 judges that cinder falls on the cooling plate 16, and at the moment, the microprocessor 19 simultaneously controls the crushing motor 2, the conveyor belt 4, the water pump 8 and the material receiving motor 7 to work;

wherein, in the using process, when the cinder just begins to fall on the cooling plate 16, the temperature of the cooling plate 16 is lower, the temperature sensor 17 detects that the temperature of the cooling plate 16 does not reach 100 ℃, therefore, the microprocessor 19 can not control the grinding motor 2, the conveyor belt 4, the water pump 8 and the material receiving motor 7 to work, therefore, the cinder just beginning to fall can be collected in the cylindrical material collecting cavity 13, the grinding motor 2, the conveyor belt 4, the water pump 8 and the material receiving motor 7 can not be controlled to work until the temperature sensor 17 detects that the temperature of the cooling plate 16 reaches 100 ℃, and the microprocessor 19 can firstly control the water pump 8 to work for ten seconds and then control the grinding motor 2, the conveyor belt 4 and the material receiving motor 7 to work, therefore, the water pump 8 can spray water in time in the cylindrical material collecting cavity 13 during the work, the coal cinder which falls in the initial stage and is not cooled is cooled, and the damage of the coal cinder which falls in the initial stage to the conveying belt is avoided.

The crushing motor 2 is used for crushing large-particle coal cinder in time, the conveying belt 4 is used for conveying the coal cinder to the outside, the water pump 8 is used for pumping water to the spray head 18 and spraying the water on the coal cinder on the surface of the cooling plate 16 through the spray head 18 to further cool the coal cinder, and the material receiving motor 7 is used for driving the material receiving plate 11 to rotate, so that the coal cinder is pushed to the feed opening 14 by the material receiving plate 11 to further crush the coal cinder; through the fixed welding of collecting hopper 10 is in the shell 1 top is collected to the cinder, collecting hopper 10 is used for collecting and guides the cinder that drops from the boiler and gets into inside the shell 1 is collected to the cinder for the cinder falls to inside the shell 1 is collected to the cinder more easily.

The working principle is as follows: when the device is used, the device is placed at the bottom of a boiler, the collecting hopper 10 is aligned to the falling position of boiler slag, when the boiler slag falls down, the collecting hopper 10 directly guides the boiler slag to the collecting cavity 13 in the coal slag collecting shell 1, in the process of entering the collecting cavity 13, the coal slag firstly falls on the cooling plate 16, when the coal slag falls on the cooling plate 16, the temperature of the cooling plate 16 rises, when the temperature sensor 17 detects that the temperature of the cooling plate 16 exceeds 100 ℃, the microprocessor 19 judges that the coal slag falls on the cooling plate 16, at the moment, the microprocessor 19 simultaneously controls the crushing motor 2, the conveyor belt 4, the water pump 8 and the material receiving motor 7 to work, wherein, the water pump 8 is used for pumping water to the spray nozzle 18 and then spraying the water on the coal slag on the surface of the cooling plate 16 through the spray nozzle 18, further cooling of the coal slag is realized, the material receiving motor 7 is used for driving the material receiving plate 11 to rotate, the coal cinder is pushed to the feed opening 14 by the material receiving plate 11 conveniently, further crushing work of the coal cinder is realized, the crushing motor 2 is used for crushing large-particle coal cinder in time, and the conveying belt 4 is used for conveying the coal cinder to the outside; according to the invention, the coal slag can be concentrated in the aggregate cavity 13, and then the coal slag is pushed to the feed opening 14 by the material receiving plate 11 in the aggregate cavity 13, because the aggregate cavity 13 is cylindrical, and the material receiving plate 11 can be just matched with the inner wall of the aggregate cavity 13 when rotating, the material receiving plate 11 can completely clean the coal slag in the aggregate cavity 13, and incomplete cleaning of the coal slag is avoided.

In the several embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a cinder cleaning device for thermal power plant which characterized in that, collects shell (1), ejection of compact shell (3), crushing roller (12), cooling plate (16) and microprocessor (19) including the cinder: the coal cinder collecting device is characterized in that two cylindrical collecting cavities (13) are fixedly arranged inside the coal cinder collecting shell (1), the collecting cavities (13) are used for collecting coal cinder waste materials, the coal cinder collecting shell (1) is positioned at one side of the bottom of the collecting cavity (13) and is provided with a feed opening (14) used for discharging coal cinder, two receiving motors (7) are fixedly arranged on the lower surface of the coal cinder collecting shell (1) through screws, the receiving motors (7) are electrically connected with signal ends of a microprocessor (19), a receiving plate (11) is fixedly welded at the power output end of the receiving motors (7), the receiving plate (11) is arranged inside the collecting cavity (13), the receiving plate (11) is used for pushing the coal cinder inside the collecting cavity (13) to the feed opening (14), the coal cinder collecting shell (1) is positioned at the bottom of the feed opening (14) and is fixedly welded with the discharging shell (3), ejection of compact shell (3) are through connection through feed opening (14) and collecting chamber (13), ejection of compact shell (3) bottom upwards is provided with conveyer belt (4) to one side, conveyer belt (4) and microprocessor (19) signal end electric connection, conveyer belt (4) are used for transmitting the cinder that falls down from ejection of compact shell (3) inside, cooling plate (16) even welding is in shell (1) top inner wall is collected to the cinder, cooling plate (16) welding respectively is collected shell (1) both sides in the cinder.

2. The coal slag cleaning device for the thermal power plant according to claim 1, further comprising:

crushing roller (12), crushing roller (12) rotate to be installed ejection of compact shell (3) top inner wall, crushing roller (12) are provided with two, crushing roller (12) are used for carrying out the breakage to the large granule cinder, ejection of compact shell (3) top outer wall has crushing motor (2) through screw fixed mounting, crushing motor (2) and microprocessor (19) signal end electric connection, crushing roller (12) fixed mounting is at crushing motor (2) power take off end, crushing motor (2) are used for driving crushing roller (12) and rotate.

3. The coal slag cleaning device for the thermal power plant according to claim 2, further comprising:

the fixed welding in crushing roller (12) surface has the arch, crushing roller (12) are broken the large granule cinder through protruding.

4. The coal slag cleaning device for the thermal power plant according to claim 1, further comprising:

the conveying outlet (15), the conveying outlet (15) is fixedly arranged on one side wall of the bottom of the discharging shell (3), the opening width of the conveying outlet (15) is the same as the width of the conveying belt (4), and the opening direction of the conveying outlet (15) is the same as the conveying direction of the conveying belt (4).

5. The coal slag cleaning device for the thermal power plant according to claim 1, further comprising:

the coal cinder conveyor comprises barrier strips (5), the barrier strips (5) are equidistantly installed on the surface of the conveyor belt (4) through screws, and the barrier strips (5) are used for preventing coal cinder from rolling downwards on the surface of the conveyor belt (4).

6. The coal slag cleaning device for thermal power plants according to claim 1, characterized in that the cooling plate (16) is disposed obliquely downward.

7. The coal slag cleaning device for the thermal power plant according to claim 6, further comprising:

shower nozzle (18), shower nozzle (18) are through screw fixed mounting at cooling plate (16) lower surface, shower nozzle (18) are used for to cooling plate (16) upper surface watering of its below, shower nozzle (18) are intake the end and are installed metal water pipe (9), metal water pipe (9) are used for carrying the water that sprays to shower nozzle (18), shell (1) one side outer wall is collected to the cinder there is water pump (8) through screw fixed mounting, water pump (8) and microprocessor (19) signal end electric connection, shower nozzle (18) are through metal water pipe (9) and water pump (8) play water end through connection.

8. The coal slag cleaning device for the thermal power plant according to claim 7, further comprising:

the filter mantle (6), the filter mantle (6) are through hose through connection and are held in water pump (8) intaking, filter mantle (6) are used for filtering the water that gets into water pump (8), the inside aquatic at cold sediment fill is placed in filter mantle (6).

9. The coal slag cleaning device for the thermal power plant according to claim 8, further comprising:

the temperature sensor (17), temperature sensor (17) pass through screw fixed mounting at cooling plate (16) lower surface, temperature sensor (17) and microprocessor (19) signal end electric connection, temperature sensor (17) are used for monitoring the temperature of cooling plate (16).

10. The coal slag cleaning device for the thermal power plant according to claim 1, further comprising:

the coal cinder collecting device comprises a collecting hopper (10), wherein the collecting hopper (10) is fixedly welded to the top of the coal cinder collecting shell (1), and the collecting hopper (10) is used for collecting and guiding coal cinder falling from a boiler to enter the coal cinder collecting shell (1).