Raw coal drying device and method for cement production

Abstract

The invention is suitable for the field of cement production, and provides a raw coal drying device and method for cement production, the raw coal drying device comprises a raw coal conveying mechanism, a first ball mill and a second ball mill, a first grinding ball set and a second grinding ball set are arranged in the first ball mill and the second ball mill correspondingly, and grinding protrusions are arranged on the inner wall of the first ball mill; the inner wall of the second ball mill is a smooth wall surface; the raw coal conveying mechanism conveys raw coal to the first ball mill through the first feeding bin, the first ball mill conveys coarse pulverized coal to the second ball mill, and the second ball mill conveys fine pulverized coal obtained after ball milling to the conveying device so that the fine pulverized coal can be conveniently conveyed to the storage bin. Through the first ball mill and the second ball mill, water in raw coal can be evaporated in the raw coal crushing process in the continuous rotation process of the grinding ball set, so that raw coal crushing and drying are achieved, and the working efficiency can be greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cement production, and in particular relates to a raw coal drying device and method for cement production. Background Art

[0002] The decomposition furnace used in cement processing generally uses pulverized coal as fuel. When starting production, the pulverized coal is sprayed into the decomposition furnace in a concentrated manner and then ignited and burned, thereby achieving the maturation of the cement raw material in the decomposition furnace to produce cement clinker.

[0003] Therefore, coal powder is needed in the cement production process, and coal powder is processed by raw coal. Before crushing, the raw coal usually needs to be dried to control the moisture in the raw coal. The existing drying equipment usually adopts a V-shaped raw coal drying device or a rotary kiln dryer to realize the drying operation of the raw coal. Then the dried raw coal is crushed and filtered through a crusher and a filter screen, so as to produce coal powder that can be used in cement processing. For example, a Chinese invention patent with a prior art publication number of CN103712226A discloses a circulating pulverizing system for small and medium-sized coal powder industrial boilers, which includes a raw coal conveying and crushing device, a drying device and a pulverizing device. The raw coal conveying and crushing device mainly includes a vibrating feeder, a belt conveyor, a crusher and a first belt conveyor. The drying device mainly includes a drying kiln, a second belt conveyor, a raw coal bin and a star-shaped discharger. The pulverizing device includes a coal mill, a bag powder collector and a screw conveyor. The conveying and crushing device conveys the raw coal to the crusher through a belt conveyor and breaks it into coal blocks of different particle sizes. The coal blocks are conveyed to the drying kiln through the first belt conveyor for heating and drying. The dried coal blocks are conveyed to the raw coal bin through the second belt conveyor. The coal blocks in the raw coal bin are discharged to the coal mill in the pulverizing device through a star-shaped unloader for pulverizing. The outlet of the pulverizer and the bag powder collector collect dust to prevent it from spreading, and then the dust is conveyed to the designated dust pulverized coal bin by a screw conveyor for storage or subsequent use.

[0004] However, the process equipment required for this coal powder manufacturing process is relatively complex. If there is any improper coordination between the various components, the entire coal powder production line will stop, which may affect the overall production progress during the cement production process. Therefore, how to effectively improve production efficiency is a technical problem that needs to be urgently solved in this application. Summary of the invention

[0005] The invention provides a raw coal drying device and method for cement production, aiming to solve the problem of low production efficiency of existing production equipment.

[0006] The present invention is implemented as follows. On the one hand, the present application provides a raw coal drying device for cement production, including a raw coal conveying mechanism, the raw coal drying device for cement production also includes a ball mill group, the ball mill group includes a first ball mill and a second ball mill arranged vertically, the first ball mill and the second ball mill are rotatably connected to a support frame through a first driving mechanism and a second driving mechanism respectively; The first ball mill and the second ball mill are respectively provided with ball milling media, and the ball milling media of the first ball mill and the second ball mill are respectively a first grinding ball group and a second grinding ball group, and the first grinding ball group and the second grinding ball group are both composed of a plurality of steel balls, and the diameter of the steel balls of the first grinding ball group is smaller than the diameter of the steel balls of the second grinding ball group; The inner wall of the first ball mill is provided with grinding protrusions, and the inner wall of the second ball mill is a smooth wall surface; The raw coal conveying mechanism conveys the raw coal to the first ball mill through the first feeding bin, the first ball mill conveys the processed coarse coal powder to the second ball mill, and the second ball mill conveys the milled fine coal powder to the transport device, so that the transport device can transport it to the storage bin.

[0007] Furthermore, a second feeding bin is provided between the first ball mill and the second ball mill, and the coarse coal powder processed by the first ball mill is transported to the second ball mill through the second feeding bin.

[0008] Furthermore, a first anti-scattering cover is arranged between the first ball mill and the second ball mill. The first anti-scattering cover is supported and fixed by a fixing frame, and the first anti-scattering cover does not contact the first ball mill and the second ball mill.

[0009] Furthermore, the first ball mill is provided with a first inlet and outlet, and the second ball mill is provided with a second inlet and outlet, and both the first inlet and outlet and the second inlet and outlet can realize feeding and discharging. The first inlet and outlet realize feeding with the first feeding bin and discharging with the second feeding bin as the first ball mill rotates, and the second inlet and outlet realizes feeding with the second feeding bin and discharging with the transportation device as the second ball mill rotates.

[0010] Furthermore, the first ball mill and the second ball mill are respectively provided with a first pressure relief valve and a second pressure relief valve, and the first pressure relief valve and the second pressure relief valve are respectively connected to the bag dust collector through a detachably connected negative pressure dust collection pipeline, and the first pressure relief valve and the second pressure relief valve are both communicatively connected to the MCU controller.

[0011] Furthermore, the first ball mill and the second ball mill are respectively provided with a first cooling chamber and a second cooling chamber, and coolant is respectively provided in the first cooling chamber and the second cooling chamber, and the flow control valves of the first cooling chamber and the second cooling chamber are respectively communicated with the MCU controller.

[0012] Furthermore, the first ball mill and the second ball mill are respectively provided with a first sensor group and a second sensor group, the first sensor group and the second sensor group respectively include a temperature sensor and a pressure sensor, and both the temperature sensor and the pressure sensor are communicatively connected to the MCU controller.

[0013] Furthermore, the first inlet and outlet are both provided with a detachably mounted screen plate and a sealing door, and the diameter of the screen holes on the screen plate of the first inlet and outlet is greater than the diameter of the screen holes on the screen plate of the second inlet and outlet.

[0014] On the other hand, the present application also discloses a method for drying raw materials for cement production, using the raw coal drying device for cement production as proposed above, and the method for drying raw materials for cement production comprises: Pre-open the first inlet and outlet of the first ball mill so that the first inlet and outlet are connected with the outlet of the first feeding bin; The raw coal conveying mechanism conveys the raw coal to the first feeding bin, and the MCU controller controls the discharge valve of the first feeding bin to open and convey a certain amount of raw coal to the first ball mill, and closes the discharge valve of the first feeding bin; After the raw coal is transported to the first ball mill, a screen plate is installed at the first inlet and outlet and a sealing door is closed, and the first driving mechanism is controlled to drive the first ball mill to rotate so that the grinding medium and the raw coal are continuously collided and crushed in the first ball mill to form coarse coal powder; Align the first inlet and outlet of the first ball mill with the inlet of the second feeding bin, align the second inlet and outlet of the second ball mill with the outlet of the second feeding bin, and open the sealing door of the first inlet and outlet to allow the coarse coal powder in the first ball mill to enter the second feeding bin, and control a certain amount of coarse coal powder to be transported to the second ball mill by the outlet valve of the second feeding bin, and close the outlet valve of the second feeding bin; After the coarse coal powder is transported to the second ball mill, a screen plate is installed at the second inlet and outlet and a sealing door is closed, and then the second driving mechanism is controlled to drive the second ball mill to rotate so that the grinding medium and the coarse coal powder continuously collide and crush in the second ball mill to form fine coal powder; The second inlet and outlet of the second ball mill is aligned with the transport device, and the sealing door of the second inlet and outlet is opened, so that the fine coal powder in the second ball mill is transported to the transport device, and then transported to the storage bin by the transport device.

[0015] Furthermore, the method for drying raw materials for cement production also includes: The MCU controller receives temperature signals and pressure signals from the temperature sensors and pressure sensors of the first sensor group and the second sensor group respectively; When the pressure value inside the first ball mill or the second ball mill is higher than the preset pressure, the MCU controller controls the first driving mechanism and the second driving mechanism to drive the first ball mill and the second ball mill to stop, and controls the first pressure relief valve and the second pressure relief valve to open, so that the internal gas passes through the first pressure relief valve and the second pressure relief valve through the negative pressure dust collection pipeline to the bag filter; When it is detected that the temperature value inside the first ball mill or the second ball mill is higher than the preset temperature, the MCU controller controls the first driving mechanism and the second driving mechanism to drive the first ball mill and the second ball mill to stop respectively, and replaces the coolant in the first cooling chamber and the second cooling chamber.

[0016] The beneficial effects achieved by the present invention are as follows: the present invention provides a raw coal drying device and method for cement production, the raw coal drying device for cement production comprising a raw coal conveying mechanism, a first ball mill and a second ball mill, the first ball mill and the second ball mill being rotatably connected to a support frame via a first driving mechanism and a second driving mechanism respectively; a first grinding ball group and a second grinding ball group consisting of a plurality of steel balls are respectively arranged in the first ball mill and the second ball mill, and the diameter of the steel balls in the first grinding ball group is smaller than the diameter of the steel balls in the second grinding ball group; a grinding protrusion is arranged on the inner wall of the first ball mill, and the inner wall of the second ball mill is a smooth wall surface; the raw coal conveying mechanism conveys the raw coal to the first ball mill via a first feeding bin, the first ball mill conveys the processed coarse coal powder to the second ball mill, and the second ball mill conveys the milled fine coal powder to a transport device, so that the transport device is convenient for transporting it to a storage bin. The present application sets a first ball mill and a second ball mill, and sets steel balls of different and decreasing diameters as grinding media in the first ball mill and the second ball mill, respectively, so that after the raw coal enters the first ball mill, the first ball mill rotates to cause the steel balls and the raw coal to collide, and in the process of continuous rotation of the steel balls, the steel balls collide with the raw coal to generate corresponding shearing force on the raw coal, thereby achieving the crushing of the raw coal. Since the collision of the steel balls on the raw coal and the collision between the steel balls will inevitably generate heat, the evaporation of the water in the raw coal can also be achieved during the crushing of the raw coal, thereby achieving the drying of the raw coal. At the same time, after the coarse coal powder crushed by the first ball mill enters the second ball mill, the second ball mill rotates to achieve the purpose of secondary crushing and drying of the coarse coal powder by the steel balls, so that fine coal powder that meets the requirements can be produced for use. Moreover, the present application uses two ball mills to simultaneously process the crushing, drying and screening of raw coal, which fully and effectively shortens the work process and process, and can greatly improve work efficiency.

[0017] Moreover, in the present application, the inner wall of the first ball mill is provided with grinding protrusions, so that in the process of making coarse coal powder, the steel balls, raw coal and grinding protrusions can play multiple roles to speed up the crushing process of the coarse coal powder and shorten the working time. The inner wall of the second ball mill is a smooth wall surface, and the use of steel balls with a smaller diameter than that of the first ball mill can ensure the shear force between the steel balls and the coarse coal powder, so that the coarse coal powder can achieve smaller particle production during the crushing process, thereby effectively achieving the quality of coal powder production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a structural schematic diagram of a raw coal drying device for cement production provided in this application.

[0021] Figure 2 It is a schematic diagram of the partial structure of the first ball mill provided in this application.

[0022] Figure 3 It is a schematic diagram of the partial structure of the second ball mill provided in this application.

[0023] Figure 4 It is a structural schematic diagram of another raw coal drying device for cement production provided in this application.

[0024] Figure 5 This is a structural schematic diagram of another raw coal drying device for cement production provided in the present application.

[0025] Figure 6 This is a system block diagram of a raw coal drying device for cement production provided in this application.

[0026] Reference numerals: 1- inclined conveyor belt, 2- conveyor frame, 3- transverse conveyor belt, 4- first feeding bin, 5- first fixed frame, 6- first ball mill, 7- second feeding bin, 8- second fixed frame, 9- second ball mill, 10- supporting frame, 11- first driving mechanism, 12- second driving mechanism, 13- transport device, 14- first anti-scattering cover, 15- MCU controller, 16- second anti-scattering cover, 17- bin door, 61- first inlet and outlet, 62- first pressure relief valve, 63- first sensor group, 64- first grinding ball group, 65- first cooling chamber, 66- grinding protrusion, 91- second inlet and outlet, 92- second pressure relief valve, 93- second sensor group, 94- second grinding ball group, 95- second cooling chamber. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] In order to effectively illustrate the embodiments of the present invention, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] See also Figure 1 , is a schematic diagram of the structure of a raw coal drying device for cement production provided in an embodiment of the present application. Figure 1 As shown, the raw coal drying device for cement production disclosed in the embodiment of the present application includes a raw coal conveying mechanism, a ball mill unit and a transport device 13. The raw coal conveying mechanism is used to convey the raw coal and send it to the ball mill unit for crushing and drying, and then the transport device 13 transports the crushed coal powder to the storage bin for storage. The transport device 13 can be a rail transport vehicle or other transport equipment, which will not be elaborated in detail here.

[0030] In the specific implementation process, the raw coal conveying mechanism includes an inclined conveyor belt 1 and a transverse conveyor belt 3. The inclined conveyor belt 1 is supported and rotated by a conveyor frame 2 to realize the conveying of raw coal. The transverse conveyor belt 3 is in contact with one end of the inclined conveyor belt 1, and the other end of the transverse conveyor belt 3 extends to the inside of the first feeding bin 4, so that the transverse conveyor belt 3 receives the raw coal transported by the inclined conveyor belt 1 and transports it to the first feeding bin 4 to achieve the conveying of raw coal. Of course, in the specific implementation process, the raw coal conveying mechanism can also directly transport the raw coal to the first feeding bin 4 by setting a bucket elevator, etc. The specific structure is not elaborated in detail here.

[0031] At the same time, combined with Figure 2 and attached Figure 3According to the structural schematic diagram of the first ball mill and the second ball mill, in the specific implementation process, the ball mill group includes a first ball mill 6 and a second ball mill 9 arranged vertically, the first ball mill 6 and the second ball mill 9 are located on the same axis, and the first ball mill 6 and the second ball mill 9 are rotatably connected to the support frame 10 through the first driving mechanism 11 and the second driving mechanism 12 respectively; the first ball mill 6 and the second ball mill 9 are respectively provided with ball milling media, and the ball milling media of the first ball mill 6 and the second ball mill 9 are respectively the first grinding ball group 64 and the second grinding ball group 94, and the first grinding ball group 64 and the second grinding ball group 94 are both composed of a plurality of steel balls, and the diameter of the steel balls of the first grinding ball group 64 is smaller than the diameter of the steel balls of the second grinding ball group 94. In the specific implementation process, the diameter of the steel balls in the first grinding ball group 64 can be set to 6CM, 5CM and 4CM respectively, and the diameter of the steel balls in the second grinding ball group 94 can be set to 4CM, 3CM and 2CM respectively, or only 3CM and 2CM, and the weight ratio is 1:1:1, and the volume of the steel balls occupies about 1 / 3 of the volume of the ball mill, so as to ensure that the raw coal or coarse coal powder can be fully collided during each rotation of the steel balls, so that it can be fully crushed and dried, thereby effectively improving the work efficiency. At the same time, the inner wall of the first ball mill 6 disclosed in the embodiment of the present application is provided with a grinding protrusion 66, and the inner wall of the second ball mill 9 is a smooth wall surface. Through the setting of the grinding protrusion 66, on the one hand, the raw coal can touch the grinding protrusion 66 during the rotation of the ball mill, and the multiple shearing and crushing in the entire ball mill can be achieved under the interaction of the steel balls, thereby accelerating the crushing process, and on the other hand, the crushing of the raw coal under the action of the grinding protrusion 66 can also increase the crushing process of itself under the action of the grinding protrusion 66, thereby effectively improving the overall work efficiency of coal powder production.

[0032] Of course, in a specific embodiment, by setting up two ball mills, it is possible to avoid the situation where only one ball mill needs to rotate for a longer time to produce fine coal powder. At the same time, the use of only one ball mill may cause the temperature and pressure in the ball mill to rise too quickly due to the long crushing and grinding time, thereby causing safety problems, thereby improving the overall production efficiency.

[0033] In addition, the first drive mechanism 11 and the second drive mechanism 12 are respectively connected to the MCU controller 15 for communication, and the first drive mechanism 11 and the second drive mechanism 12 respectively drive the first ball mill 6 and the second ball mill 9 to rotate at different speeds. Generally speaking, in order to ensure work efficiency, the speed of the first ball mill 6 will be less than the speed of the second ball mill 9, thereby ensuring rapid processing from coarse coal powder to fine coal powder. Of course, the speeds of the two can also be the same, but the MCU controller 15 can independently control the first drive mechanism 11 and the second drive mechanism 12, so that the first ball mill 6 and the second ball mill 9 can operate independently.

[0034] The raw coal conveying mechanism conveys the raw coal to the first ball mill 6 through the first feeding bin 4, the first ball mill 6 conveys the processed coarse coal powder to the second ball mill 9, and the second ball mill 9 conveys the milled fine coal powder to the transportation device 13, so that the transportation device 13 can be transported to the storage bin.

[0035] Combination Figure 2 , Figure 3 As shown, a second feeding bin 7 is provided between the first ball mill 6 and the second ball mill 9, and the coarse coal powder processed by the first ball mill 6 is transported to the second ball mill 9 through the second feeding bin 7. The first feeding bin 4 and the second feeding bin 7 are supported and fixed by the first fixing frame 5 and the second fixing frame 8 respectively, and the first fixing frame 5 and the second fixing frame 8 are not in contact with the first ball mill 6 and the second ball mill 9. This facilitates the first ball mill 6 and the second ball mill 9 to avoid damage to the first feeding bin 4 and the second feeding bin 7 when they rotate.

[0036] During the specific implementation, the first ball mill 6 is provided with a first inlet and outlet 61, and the second ball mill 9 is provided with a second inlet and outlet 91. The first inlet and outlet 61 and the second inlet and outlet 91 can both realize feeding and discharging. The first inlet and outlet 61 realizes feeding with the first feeding bin 4 and discharging with the second feeding bin 7 as the first ball mill 6 rotates, and the second inlet and outlet 91 realizes feeding with the second feeding bin 7 and discharging with the transport device 13 as the second ball mill 9 rotates. Of course, the first inlet and outlet 61 and the second inlet and outlet 91 are both provided with detachable sieve plates and sealing doors, so as to facilitate the purpose of feeding and discharging from the same position. The diameter of the sieve holes on the sieve plate of the first inlet and outlet 61 is larger than the diameter of the sieve holes on the sieve plate of the second inlet and outlet 91, so that the coal blocks with larger particle size that do not meet the requirements can be retained in the ball mill for further crushing, avoiding the subsequent further screening process. Of course, in the specific implementation process, the sieve plate can also be provided with a vibrating screening device to avoid clogging of the sieve holes. The specific sieve hole diameter and the vibrating screening device are no longer described in detail, and the relevant contents disclosed in the prior art can be referred to.

[0037] like Figure 2 and Figure 3As shown, the first ball mill 6 and the second ball mill 9 are respectively provided with a first pressure relief valve 62 and a second pressure relief valve 92, and the first pressure relief valve 62 and the second pressure relief valve 92 are respectively connected to the bag filter through a detachably connected negative pressure dust collection pipeline (not shown in the drawings, not elaborated here, and can refer to the prior art), and the first pressure relief valve 62 and the second pressure relief valve 92 are both connected to the MCU controller 15 in communication, so that the MCU controller 15 can open the pressure relief valve in time to balance the pressure when the pressure value inside the first ball mill 6 and the second ball mill 9 is large. At the same time, the first ball mill 6 and the second ball mill 9 are respectively provided with a first cooling chamber 65 and a second cooling chamber 95, and the first cooling chamber 65 and the second cooling chamber 95 are respectively provided with coolant, and the flow control valves of the first cooling chamber 65 and the second cooling chamber 95 are respectively connected to the MCU controller 15 in communication, so that the coolant in the first cooling chamber 65 and the second cooling chamber 95 can be added or replaced by the MCU controller 15 by controlling the flow control valve.

[0038] In the specific implementation process, the first cooling chamber 65 and the second cooling chamber 95 may not be provided, so that the temperature can be reduced when the pressure relief valve is used for pressure relief. Of course, the replacement of the coolant in the first cooling chamber 65 and the second cooling chamber 95 can be carried out after the ball mill is shut down, or a coolant tank (not shown in the drawings) can be provided on the outer wall of the ball mill, so that the replacement and injection during the operation of the ball mill can be achieved by controlling the flow control valve. The above method is only an exemplary implementation method and will not be elaborated in detail here.

[0039] At the same time, in order to monitor the situation inside the ball mill in real time, the embodiment of the present application also discloses that the first sensor group 63 and the second sensor group 93 are respectively set in the first ball mill 6 and the second ball mill 9, and the first sensor group 63 and the second sensor group 93 respectively include a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are both connected to the MCU controller 15 for communication, so that the MCU controller 15 can receive the pressure value and temperature value inside the first ball mill 6 and the second ball mill 9 in real time, avoiding the combustion of coal powder due to excessive temperature or the occurrence of safety accidents due to excessive pressure. Thereby, the first ball mill 6 and the second ball mill 9 can effectively realize the precise control of the crushing and drying of raw coal, thereby improving the work efficiency and the quality of coal powder.

[0040] See also Figure 4As shown, in the raw coal drying device for cement production disclosed in the embodiment of the present application, a first anti-scattering cover 14 is provided between the first ball mill 6 and the second ball mill 9. The first anti-scattering cover 14 may be a funnel-shaped structure. Of course, the first anti-scattering cover 14 may also be provided at the position of the first feeding bin 4. The provision of the first anti-scattering cover 14 can prevent the first feeding bin 4 and the second feeding bin 7 from sliding to the outside of the first ball mill 6 and the second ball mill 9 during feeding to the greatest extent. Of course, since there are basically dust particles entering the second ball mill 9 from the second feeding bin 7, it is preferably provided at the position of the second feeding bin 7. At the same time, the first anti-scattering cover 14 is supported and fixed by a fixed frame, and the first anti-scattering cover 14 does not contact the first ball mill 6 and the second ball mill 9, so as to avoid the risk and damage caused by the first anti-scattering cover 14 rotating together with the first ball mill 6 and the second ball mill 9 during rotation.

[0041] In addition, this application also discloses another embodiment, which can be seen in the attached Figure 5 As shown. The first ball mill 6 implemented in the present application may be provided with a second anti-scattering cover 16, which may be an annular cover body, and a bin door 17 is provided on the top of the annular cover body. When it is necessary to transport raw coal to the first ball mill 6, the bin door 17 can be opened, and when the raw coal is transported, the bin door 17 can be closed. The bin door 17 and the annular cover body are integrally rotated and controlled, and the annular cover body is funnel-shaped and connected to the second feeding bin 7. The second anti-scattering cover 16 can be fixed to the bottom surface by a support frame, and the side wall of the second anti-scattering cover 16 does not contact the first ball mill 6 so as not to affect the rotation of the first ball mill 6. The second anti-scattering cover 16 of the annular cover body is set not to move with the rotation of the first ball mill 6, and after closing the bin door 17, only the bottom can flow out the coarse coal powder. Therefore, during the implementation of the present application, the sealing door of the first inlet and outlet 61 may not be closed during the rotation of the first ball mill 6, so that the coarse coal powder generated during the rotation of the first ball mill 6 to crush the raw coal can enter the second anti-scattering cover 16 of the annular cover through the screen plate, so that the coarse coal powder can flow out at any time, which can make the coarse coal powder enter the second feeding bin 7 in batches, and can also ensure the crushing efficiency. Of course, the above is only an exemplary embodiment, and the structure of the second anti-scattering cover 16 can also be applied to the second ball mill 9. The details are not elaborated here, and the relevant description of the prior art can be referred to.

[0042] The raw coal drying device for cement production disclosed in the above embodiment can not only perform crushing and drying step by step in the ball mill, thereby reducing the process flow of coal powder production and thus reducing production costs, but also ensure drying during the crushing process, thereby greatly improving work efficiency.

[0043] On the basis of the above implementation, the present application also provides an implementation of a method for drying raw materials for cement production. Figure 6 The system block diagram of the raw coal drying device for cement production is shown.

[0044] like Figure 6 As shown, the system disclosed in the present application includes an MCU controller 15, and the MCU controller 15 is respectively connected to all sensors of the first sensor group 63 and the second sensor group 93, the first pressure relief valve 62, the second pressure relief valve 92, the first drive mechanism 11, the second drive mechanism 12, the flow control valve of the first cooling chamber 65 and the second cooling chamber 95. Of course, other components that can realize automatic control disclosed in the embodiments of the present application can also be connected to the MCU controller 15 through communication, so as to realize automatic control.

[0045] Based on the above description, the method for drying raw materials for cement production disclosed in the embodiment of the present application specifically includes the following steps: Step S11 : pre-open the first inlet and outlet port 61 of the first ball mill 6 , so that the first inlet and outlet port 61 is connected to the outlet port of the first feeding bin 4 .

[0046] In the specific implementation process, the sieve plate and the sealing door provided on the first ball mill 6 are opened, so that the first inlet and outlet 61 can realize the feeding work with the first feeding bin 4. Of course, the second ball mill 9 also realizes the feeding work with the second inlet and outlet 91 and the second feeding bin 7 by opening the sieve plate and the sealing door, which will not be elaborated in detail here.

[0047] Step S12: The inclined conveyor belt 1 and the transverse conveyor belt 3 convey the raw coal to the first feeding bin 4, and the MCU controller controls the discharge valve of the first feeding bin 4 to open and convey a certain amount of raw coal to the first ball mill 6, and closes the discharge valve of the first feeding bin 4.

[0048] During the specific implementation process, in order to avoid exceeding the amount of raw coal fed into the first ball mill 6 when transporting raw coal and to ensure the overall production efficiency, discharge valves can be set on the first feeding bin 4 and the second feeding bin 7, and the feeding of the first ball mill 6 and the second ball mill 9 can be achieved by controlling the opening and closing of the discharge valves. When feeding is not needed, a certain amount of raw coal or coarse coal powder can be stored in the first feeding bin 4 and the second feeding bin 7 in advance to facilitate the next rapid feeding process.

[0049] Step S13: After the raw coal is transported to the first ball mill 6, a sieve plate is installed at the first inlet and outlet 61 and a sealing door is closed, and then the first driving mechanism 11 is controlled to drive the first ball mill 6 to rotate so that the grinding medium and the raw coal are continuously collided and crushed in the first ball mill 6 to form coarse coal powder.

[0050] During the specific implementation process, please refer to the above-mentioned public content about the raw coal drying device for cement production for the raw coal processing process.

[0051] Step S14: align the first inlet and outlet port 61 of the first ball mill 6 with the inlet port of the second feeding bin 7, align the second inlet and outlet port 91 of the second ball mill 9 with the outlet port of the second feeding bin 7, and open the sealing door of the first inlet and outlet port 61 to allow the coarse coal powder in the first ball mill 6 to enter the second feeding bin 7, and control a certain amount of coarse coal powder to be transported to the second ball mill 9 under the control of the outlet valve of the second feeding bin 7, and close the outlet valve of the second feeding bin 7.

[0052] Of course, in the specific implementation process, the coarse coal powder in the first ball mill 6 can also be sent to the second feeding bin 7 and left for a period of time. On the one hand, it can ensure that the coarse coal powder is cooled in the second feeding bin 7. On the other hand, the second feeding bin 7 can accumulate a certain amount of coarse coal powder and then transport it to the second ball mill 9 for processing, so as to ensure that more coal powder is produced at one time. Of course, in the specific implementation process, the second feeding bin 7 can also be provided with a corresponding cooling device to cool the coarse coal powder to avoid the second ball mill 9 from heating up quickly during the processing, thereby shortening the processing time. The details are not elaborated here.

[0053] Step S15: After the coarse coal powder is transported to the second ball mill 9, a sieve plate is installed at the second inlet and outlet 91 and a sealing door is closed, and then the second driving mechanism 12 is controlled to drive the second ball mill 9 to rotate so that the grinding medium and the coarse coal powder are continuously collided and crushed in the second ball mill 9 to form fine coal powder.

[0054] Step S16: align the second inlet and outlet 91 of the second ball mill 9 with the transport device 13, and open the sealing door of the second inlet and outlet 91, so that the fine coal powder in the second ball mill is transported to the transport device 13, and then transported to the storage bin by the transport device 13.

[0055] On the basis of the above-mentioned implementation mode, the method for drying raw materials for cement production disclosed in the present application further comprises the following steps: Step S21: The MCU controller 15 receives temperature signals and pressure signals from the temperature sensors and pressure sensors of the first sensor group 63 and the second sensor group 93 respectively.

[0056] Step S22: When the pressure value inside the first ball mill 6 or the second ball mill 9 is higher than the preset pressure, the MCU controller 15 controls the first drive mechanism 11 and the second drive mechanism 12 to drive the first ball mill 6 and the second ball mill 9 to stop, and controls the first pressure relief valve 62 and the second pressure relief valve 92 to open, so that the internal gas passes through the first pressure relief valve 62 and the second pressure relief valve 92 via the negative pressure dust collection pipeline to the bag collector.

[0057] Step S23: When it is detected that the temperature value inside the first ball mill 6 or the second ball mill 9 is higher than the preset temperature, the MCU controller 15 controls the first driving mechanism 11 and the second driving mechanism 12 to drive the first ball mill 6 and the second ball mill 9 to stop, and replace the coolant in the first cooling chamber 65 and the second cooling chamber 95.

[0058] In the specific implementation process, the implementation methods of step S22 and step S23 are not performed separately. Because the temperature and pressure are generally in direct proportion during the production of coal powder, it is possible to replace the coolant in the first cooling chamber 65 and the second cooling chamber 95 when the machine is shut down in step S22, and even the coolant in the first cooling chamber 65 and the second cooling chamber 95 can be replaced during the rotation of the ball mill. For details, please refer to the description of the above-mentioned related embodiments, which will not be elaborated in detail here. Of course, due to special circumstances, such as the situation where the temperature rises too fast due to a large number of impurities or other substances in the raw coal, independent control of step S22 and step S23 can also be achieved, which will not be elaborated in detail here.

[0059] At the same time, the implementation mode of the present application can also be combined with the attached Figure 5 The method for drying raw materials for cement production is adaptively adjusted and modified. For details, please refer to the above-mentioned relevant embodiment description, which will not be elaborated in detail here.

[0060] The embodiment of the present application realizes the refined control of each component of the raw material drying device for cement production through the raw material drying method for cement production, so that the raw coal can be crushed and dried at least in two stages, and the crushing and drying are carried out simultaneously, which can not only improve the quality of coal powder, but also effectively improve the work efficiency. Of course, the steps mentioned in the above embodiment are not completely executed in sequence, and can be processed according to specific circumstances during the specific implementation process, which will not be elaborated here.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A raw coal drying device for cement production, comprising a raw coal conveying mechanism, characterized in that: The raw coal drying device for cement production further comprises a ball mill group, the ball mill group comprising a first ball mill (6) and a second ball mill (9) arranged vertically, the first ball mill (6) and the second ball mill (9) being rotatably connected to the support frame (10) via a first driving mechanism (11) and a second driving mechanism (12), respectively; The first ball mill (6) and the second ball mill (9) are respectively provided with ball milling media, the ball milling media of the first ball mill (6) and the second ball mill (9) are respectively a first grinding ball group (64) and a second grinding ball group (94), the first grinding ball group (64) and the second grinding ball group (94) are both composed of a plurality of steel balls, and the diameter of the steel balls of the first grinding ball group (64) is smaller than the diameter of the steel balls of the second grinding ball group (94); The inner wall of the first ball mill (6) is provided with a grinding protrusion (66), and the inner wall of the second ball mill (9) is a smooth wall surface; The raw coal conveying mechanism conveys the raw coal to the first ball mill (6) via the first feeding bin (4); the first ball mill (6) conveys the processed coarse coal powder to the second ball mill (9); the second ball mill (9) conveys the milled fine coal powder to the transport device (13), so that the transport device (13) can transport the raw coal to the storage bin.

2. The raw coal drying device for cement production according to claim 1, characterized in that: A second feeding bin (7) is provided between the first ball mill (6) and the second ball mill (9), and the coarse coal powder processed by the first ball mill (6) is transported to the second ball mill (9) through the second feeding bin (7).

3. The raw coal drying device for cement production according to claim 1 or 2, characterized in that: A first anti-scattering cover (14) is provided between the first ball mill (6) and the second ball mill (9); the first anti-scattering cover (14) is supported and fixed by a fixing frame; the first anti-scattering cover (14) is not in contact with the first ball mill (6) and the second ball mill (9).

4. The raw coal drying device for cement production according to claim 3, characterized in that: The first ball mill (6) is provided with a first material inlet and outlet (61), and the second ball mill (9) is provided with a second material inlet and outlet (91). Both the first material inlet and outlet (61) and the second material inlet and outlet (91) can realize feeding and discharging. The first material inlet and outlet (61) realizes feeding with the first feeding bin (4) and discharging with the second feeding bin (7) as the first ball mill (6) rotates, and the second material inlet and outlet (91) realizes feeding with the second feeding bin (7) and discharging with the transport device (13) as the second ball mill (9) rotates.

5. The raw coal drying device for cement production according to claim 4, characterized in that: The first ball mill (6) and the second ball mill (9) are respectively provided with a first pressure relief valve (62) and a second pressure relief valve (92); the first pressure relief valve (62) and the second pressure relief valve (92) are respectively connected to the bag filter through a detachably connected negative pressure dust collection pipeline, and the first pressure relief valve (62) and the second pressure relief valve (92) are both communicatively connected to the MCU controller (15).

6. The raw coal drying device for cement production according to claim 5, characterized in that: A first cooling chamber (65) and a second cooling chamber (95) are respectively arranged inside the first ball mill (6) and the second ball mill (9), and cooling liquid is respectively arranged inside the first cooling chamber (65) and the second cooling chamber (95), and the flow control valves of the first cooling chamber (65) and the second cooling chamber (95) are respectively connected to the MCU controller (15) for communication.

7. The raw coal drying device for cement production according to claim 6, characterized in that: A first sensor group (63) and a second sensor group (93) are respectively arranged in the first ball mill (6) and the second ball mill (9), the first sensor group (63) and the second sensor group (93) respectively comprising a temperature sensor and a pressure sensor, and both the temperature sensor and the pressure sensor are communicatively connected to the MCU controller (15).

8. The raw coal drying device for cement production according to claim 6, characterized in that: The first material inlet and outlet (61) and the second material inlet and outlet (91) are both provided with a detachably mounted screen plate and a sealing door, and the diameter of the screen holes on the screen plate of the first material inlet and outlet (61) is larger than the diameter of the screen holes on the screen plate of the second material inlet and outlet (91).

9. A method for drying raw materials for cement production, using the raw coal drying device for cement production as described in any one of claim 1, characterized in that: The method comprises: Pre-opening the first inlet and outlet port (61) of the first ball mill (6) so that the first inlet and outlet port (61) is docked with the outlet port of the first feeding bin (4); The raw coal conveying mechanism conveys the raw coal to the first feeding bin (4), and the MCU controller controls the discharge valve of the first feeding bin (4) to open and convey a certain amount of raw coal to the first ball mill (6), and closes the discharge valve of the first feeding bin (4); After the raw coal is transported to the first ball mill (6), a screen plate is installed at the first material inlet and outlet (61), and the sealing door is closed, and the first driving mechanism (11) is controlled to drive the first ball mill (6) to rotate so that the grinding medium and the raw coal are continuously collided and crushed in the first ball mill (6) to form coarse coal powder; The first inlet and outlet opening (61) of the first ball mill (6) is aligned with the inlet opening of the second feeding bin (7), and the second inlet and outlet opening (61) of the second ball mill (9) is aligned with the outlet opening of the second feeding bin (7), and the sealing door of the first inlet and outlet opening (61) is opened to allow the coarse coal powder in the first ball mill (6) to enter the second feeding bin (7), and a certain amount of the coarse coal powder is transported to the second ball mill (9) under the control of the outlet valve of the second feeding bin (7), and the outlet valve of the second feeding bin (7) is closed; After the coarse coal powder is transported to the second ball mill (9), a screen plate is installed at the second inlet and outlet (91) and the sealing door is closed, thereby controlling the second driving mechanism (12) to drive the second ball mill (9) to rotate so that the grinding medium and the coarse coal powder are continuously collided and crushed in the second ball mill (9) to form fine coal powder; The second inlet and outlet port (91) of the second ball mill (9) is aligned with the transport device (13), and the sealed door of the second inlet and outlet port (91) is opened, so that the fine coal powder in the second ball mill is transported to the transport device (13), and then transported to the storage bin by the transport device (13).

10. The method for drying raw materials for cement production according to claim 9, characterized in that: The method further comprises: The MCU controller (15) receives temperature signals and pressure signals of the temperature sensors and pressure sensors of the first sensor group (63) and the second sensor group (93), respectively; When the pressure value inside the first ball mill (6) or the second ball mill (9) is higher than a preset pressure, the MCU controller (15) controls the first drive mechanism (11) and the second drive mechanism (12) to drive the first ball mill (6) and the second ball mill (9) to stop, and controls the first pressure relief valve (62) and the second pressure relief valve (92) to open, so that the internal gas passes through the first pressure relief valve (62) and the second pressure relief valve (92) and is connected to the bag filter via the negative pressure dust collection pipeline; When it is detected that the temperature value inside the first ball mill (6) or the second ball mill (9) is higher than a preset temperature, the MCU controller (15) controls the first drive mechanism (11) and the second drive mechanism (12) to drive the first ball mill (6) and the second ball mill (9) to stop, and replace the coolant in the first cooling chamber (65) and the second cooling chamber (95).

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