A coal mill outlet temperature control device

Abstract

This invention relates to the field of thermal power generation and discloses a coal mill outlet temperature control device, comprising: a mounting shell, a temporary storage bin, a material feeding component, a feeding pipe assembly, a discharge collection bin, and a temperature control component; the mounting shell is disposed above the feed inlet of the coal mill; the temporary storage bin is disposed inside the mounting shell, with its feed inlet extending out of the mounting shell; the material feeding component is disposed inside the temporary storage bin and can push the material discharged into the temporary storage bin into the discharge outlet of the temporary storage bin; the feed inlets of the feeding pipe assembly are respectively connected to the discharge outlets of the temporary storage bin; the discharge collection bin is connected to the discharge outlet of the feeding pipe assembly, and its discharge outlet is connected to the feed inlet of the coal mill; the temperature control component is connected to the feeding pipe assembly to control the temperature of the material in the feeding pipe assembly; this application has a dual temperature control system, which can perform dual temperature control through a heat source system and a hot air system, resulting in higher heating efficiency, a wider heating range, stronger controllability, and greater efficiency.

Description

Technical Field

[0001] This invention belongs to the field of thermal power generation, and in particular relates to a photovoltaic module structure that can adjust the tilt angle. Background Technology

[0002] Coal is the main raw material for thermal power generation in my country, and this trend is unlikely to change for a considerable period of time. Although significant progress has been made in coal-fired power generation technology, thermal power generation remains a weak link in my country's economy. The efficiency of equipment is much lower than that of advanced foreign countries, with the national average efficiency of thermal power plants at 32.3%, compared to 47.5% in advanced foreign countries.

[0003] Generally speaking, the higher the temperature of the gas-powder mixture at the coal mill outlet, the more beneficial it is to the coal powder drying process. However, the temperature must not exceed the safety limit. If the outlet temperature is higher than the specified value, the high temperature will drive volatiles to escape from the coal, increasing the potential for fuel ignition. If the outlet temperature is lower than the specified value, the coal will not be sufficiently dried and will be adsorbed inside the coal mill and in the coal powder pipes, causing blockage of the coal powder pipes and potentially leading to fire in the coal mill and coal powder pipes.

[0004] The design outlet temperature for medium-speed mills is generally set at 70–90℃. For high-volatile coal types, the minimum temperature should be maintained at 65–70℃; for low-volatile coal types, it should not exceed 90–95℃. The minimum outlet temperature of the coal mill should be 10℃ higher than the dew point, but not lower than 60℃, to avoid coal powder agglomeration. Due to limitations imposed by the oxygen content of the drying medium, the layout of the pulverizing system, the volatile matter content of the raw coal, and the mill rollers, the maximum emergency shutdown temperature during operation is 110℃.

[0005] The outlet temperature of a coal mill is controlled by adjusting the inlet air temperature. The inlet air temperature depends on the mill's thermal balance, with the moisture content of the raw coal having a significant impact. The primary air temperature entering the mill is adjusted by changing the proportion of cold air mixed in, based on the primary air outlet temperature of the air preheater. However, this method has a relatively limited temperature control effect and suffers from low heating efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a coal mill outlet temperature control device to solve at least one of the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:

[0008] In some embodiments of this application, a coal mill outlet temperature control device is provided, comprising: a mounting housing, a temporary storage bin, a material feeding component, a feeding pipe assembly, a discharge collection bin, and a temperature control component; wherein...

[0009] The mounting housing is positioned above the feed inlet of the coal mill; a temporary storage silo is located inside the mounting housing, with its feed inlet extending out of the housing and having at least two discharge outlets; a material feeding component is located inside the temporary storage silo, capable of pushing the material discharged into the temporary storage silo into its discharge outlet; the conveying pipe assembly has at least two feed inlets, each connected to the discharge outlet of the temporary storage silo; the discharge collection silo has multiple feed inlets, each connected to the discharge outlet of the conveying pipe assembly, and its discharge outlet is connected to the feed inlet of the coal mill; a temperature control component is connected to the conveying pipe assembly to control the temperature of the material within the conveying pipe assembly.

[0010] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, a preliminary crushing device is also included, which is connected to the feed inlet of the temporary storage silo and is used to preliminarily crush the coal blocks and discharge the crushed coal particles into the temporary storage silo.

[0011] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, the preliminary crushing device includes: a crushing shell, a grinding cylinder, a grinding body, a crushing motor, a worm gear mechanism, and a guide plate; wherein,

[0012] The feed inlet and discharge outlet of the crushing shell are both funnel-shaped structures; the grinding cylinder is open at both ends, and its outer wall is fixedly connected to the inner wall of the crushing shell through a fixing plate; the grinding body is disposed in the grinding cylinder, and the corresponding side walls of the grinding cylinder and the grinding body are provided with grinding protrusions for crushing coal; the bottom of the grinding body is connected to a rotating connecting rod, the bottom of which is rotatably connected to a fixed mounting plate, which is fixed to the crushing shell; the crushing motor is disposed on the fixed mounting plate; the worm wheel of the worm gear mechanism is connected to the bottom of the rotating connecting rod, and the worm is connected to the output shaft of the crushing motor; the guide plate is inclinedly disposed below the grinding cylinder and connected to the grinding cylinder and the fixed mounting plate.

[0013] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, the material feeding component includes:

[0014] A drive motor is vertically mounted at the bottom of the temporary storage silo, and its output shaft passes through the temporary storage silo.

[0015] A material guide is installed inside the temporary storage bin and connected to the output shaft of the drive motor.

[0016] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, the feeding pipe group is provided with at least two feeding pipes. The inlet and outlet of each feeding pipe are connected to the temporary storage bin and the discharge collection bin. The middle part of each feeding pipe is bent or coiled outward to extend its conveying distance.

[0017] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, the temperature control component includes: a liquid heat source component and a heat source system; wherein,

[0018] At least two liquid thermal components are provided, each covering the outside of each of the feed pipes. Each liquid thermal component is provided with a heat medium pipeline, and the heat medium pipelines of adjacent liquid thermal components are connected in series. The heat source system is connected to the common liquid inlet and common liquid outlet of multiple liquid thermal components through a pressurizing pump and connecting pipelines, and is used to supply heat exchange medium into the liquid thermal components.

[0019] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, a hot air system is also included, which includes: a heating shell, an air heating device, a fan device, and a hot air duct;

[0020] The heating housing is located on one side of the mounting housing, and its air inlet is connected to the flue gas passage of the power plant boiler.

[0021] An air heating device is installed inside the heating housing to heat air; a fan device is installed inside the heating housing and corresponds to the air heating device to supply flue gas to the air heating device; a hot air duct connects the hot air outlet of the heating housing and the inlet of the coal mill to provide heated flue gas.

[0022] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, a control system is also included, which comprises: temperature detection component one, temperature detection component two, temperature detection component three, temperature detection component four, and a controller; wherein,

[0023] Temperature detection component one is installed at the common inlet of the multiple liquid-heating components to detect the temperature of the heat exchange medium at the inlet; temperature detection component two is installed at the common outlet of the multiple liquid-heating components to detect the temperature of the heat exchange medium at the outlet; temperature detection component three is installed inside the hot air duct to detect the temperature of the hot air; temperature detection component four is installed at the outlet of the discharge collection bin to detect the outlet temperature; the controller is electrically connected to temperature detection component one, temperature detection component two, temperature detection component three, temperature detection component four, the pressurization pump of the heat source system, and the air heating device.

[0024] In the preferred embodiment of the above-mentioned coal mill outlet temperature control device, the controller can obtain the temperature difference data of the heat exchange medium before and after heat exchange based on the temperature data collected by the temperature detection component one and the temperature detection component two, and control the flow rate of the heat exchange medium supplied by the heat source system based on the temperature difference data one; and control the heating power of the air heating device based on the hot air temperature detected by the temperature detection component three and the outlet temperature detected by the temperature detection component four.

[0025] In the preferred embodiment of the above coal mill outlet temperature control device, when controlling the flow rate of the heat exchange medium supplied by the heat exchange medium supply device according to the range value of the temperature difference data one, determine the range value H of the temperature difference data one, preset the range value matrix H0 of the temperature difference data one, and set H0(H1, H2, H3, H4), where H1 is the first preset range value of the temperature difference data one, H2 is the second preset range value of the temperature difference data one, H3 is the third preset range value of the temperature difference data one, H4 is the fourth preset range value of the temperature difference data one, and H1 < H2 < H3 < H4;

[0026] Determine the range value D of the flow rate of the heat exchange medium supplied, preset the flow rate matrix D0 of the heat exchange medium supplied, and set D0(D1, D2, D3, D4), where D1 is the first preset flow rate of the heat exchange medium supplied, D2 is the second preset flow rate of the heat exchange medium supplied, D3 is the third preset flow rate of the heat exchange medium supplied, D4 is the fourth preset flow rate of the heat exchange medium supplied, and D1 < D2 < D3 < D4;

[0027] Set the flow rate of the heat exchange medium supplied according to the relationship between the range value H of the temperature difference data one and the flow rate of the heat exchange medium supplied by the heat exchange medium supply device:

[0028] When H < H1, select the first preset flow rate D1 of the heat exchange medium supplied as the flow rate of the heat exchange medium supplied;

[0029] When H1 ≤ H < H2, select the second preset flow rate D2 of the heat exchange medium supplied as the flow rate of the heat exchange medium supplied;

[0030] When H2 ≤ H < H3, select the third preset flow rate D3 of the heat exchange medium supplied as the flow rate of the heat exchange medium supplied;

[0031] When H3 ≤ H < H4, select the fourth preset flow rate D4 of the heat exchange medium supplied as the flow rate of the heat exchange medium supplied.

[0032] In the preferred embodiment of the above coal mill outlet temperature control device, when the heat source system reaches the maximum heating power, if the temperature at the discharge port is lower than the preset value, the controller controls the air heating device to supply hot air to the coal mill feed port.

[0033] Through the above technical solutions, it can be seen that compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] This application features a dual temperature control system, which can control the temperature through both a heat source system and a hot air system. This results in higher heating efficiency, a wider heating range, and greater controllability, thus improving work efficiency. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1-2 A perspective view provided for an embodiment of the present invention;

[0037] Figure 2-3 These are three-dimensional views of the installation housing from different perspectives in embodiments of the present invention;

[0038] Figure 4 This is a schematic diagram of the connection of the feeding component in an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the material feeding component in an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the preliminary crushing device in an embodiment of the present invention.

[0041] In the picture:

[0042] 1. Mounting housing; 10. Support feet; 2. Temporary storage bin; 3. Material feeding component; 30. Drive motor; 300. Mounting frame; 31. Guide component; 310. Material feeding plate; 4. Feeding pipe assembly; 5. Discharge collection bin; 60. Liquid heating component; 7. Preliminary crushing device; 70. Crushing housing; 71. Grinding cylinder; 72. Grinding body; 73. Crushing motor; 74. Worm gear mechanism; 75. Fixed mounting plate; 76. Guide plate. Detailed Implementation

[0043] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0044] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0048] See Figure 1-6 As shown, a coal mill outlet temperature control device according to an embodiment of this application includes: a mounting housing 1, a temporary storage bin 2, a material feeding component 3, a feeding pipe assembly 4, a discharge collection bin 5, and a temperature control component; wherein,

[0049] The mounting housing 1 is positioned above the feed inlet of the coal mill; the temporary storage silo 2 is located inside the mounting housing 1, with its feed inlet extending out of the mounting housing 1 and having at least two discharge outlets; the material feeding component 3 is located inside the temporary storage silo 2, capable of pushing the material discharged into the temporary storage silo 2 into its discharge outlet; the conveying pipe assembly has at least two feed inlets, each connected to the discharge outlet of the temporary storage silo 2; the discharge collection silo 5 has multiple feed inlets, each connected to the discharge outlet of the conveying pipe assembly 4, and its discharge outlet is connected to the feed inlet of the coal mill; the temperature control component is connected to the conveying pipe assembly 4 to control the temperature of the material within the conveying pipe assembly 4.

[0050] It should be noted that, in order to prevent coal from accumulating in the feeding pipe assembly 4, a negative pressure suction mechanism can also be installed in the discharge collection bin 5 to facilitate the smooth discharge of coal.

[0051] Specifically, the mounting housing 1 has a square structure and is provided with support feet 10 arranged in a triangular pattern at the bottom.

[0052] In a preferred embodiment of the above, a preliminary crushing device 7 is further included, which is connected to the feed inlet of the temporary storage silo 2 and is used to perform preliminary crushing of the coal blocks and discharge the crushed coal blocks into the temporary storage silo 2.

[0053] Specifically, the preliminary crushing device 7 includes: a crushing shell 70, a grinding cylinder 71, a grinding body 72, a crushing motor 73, a worm gear mechanism 74, and a guide plate 76; wherein,

[0054] The feed inlet and discharge outlet of the crushing shell 70 are both funnel-shaped structures, and its outer wall is fixed to the top of the mounting shell 1 by four evenly distributed support rods; the grinding cylinder 71 has openings at both ends, and its outer wall is fixedly connected to the inner wall of the crushing shell 70 by a fixing plate; the grinding body 72 is set inside the grinding cylinder 71, and the corresponding side walls of the grinding cylinder 71 and the grinding body 72 are provided with grinding protrusions for crushing coal; the bottom of the grinding body 72 is connected to a rotating connecting rod, and the bottom of the rotating connecting rod is rotatably connected to the fixed mounting plate 75, which is fixed to the crushing shell 70; the crushing motor 73 is set on the fixed mounting plate 75; the worm wheel of the worm gear mechanism 74 is connected to the bottom of the rotating connecting rod, and the worm is connected to the output shaft of the crushing motor 73; the guide plate 76 is inclinedly set below the grinding cylinder 71 and connected to the grinding cylinder 71 and the fixed mounting plate 75.

[0055] Specifically, the grinding body 72 has a conical structure with its tip facing the feed inlet of the crushing shell 70.

[0056] In a preferred embodiment of the above embodiments, the material feeding component 3 includes: a drive motor 30 and a material guide 31; wherein,

[0057] The drive motor 30 is vertically mounted at the bottom of the temporary storage bin 2 via the mounting bracket 300, and its output shaft passes through the temporary storage bin 2; the material guide 31 is set in the temporary storage bin 2 and is connected to the output shaft of the drive motor 30.

[0058] Specifically, the material guide 31 has a conical structure, and its outer wall is provided with a material-pushing plate 310 perpendicular to the conical surface, which can push the material into the discharge port.

[0059] In the preferred embodiment described above, the feeding pipe group 4 is provided with at least two feeding pipes. The inlet and outlet of each feeding pipe are connected to the temporary storage bin 2 and the discharge collection bin 5. The middle part of each feeding pipe is bent or coiled outward to extend its conveying distance.

[0060] Specifically, the feeding tube group 4 has four feeding tubes, with the middle of which is bent and the bending angle is greater than 90°.

[0061] In a preferred embodiment of the above embodiments, the temperature control component includes: a liquid heat exchanger 60 and a heat source system; wherein,

[0062] At least two liquid heat exchanger components 60 are provided, each covering the outside of a feed pipe. Each liquid heat exchanger component 60 is equipped with a heat medium pipeline, and the heat medium pipelines of adjacent liquid heat exchanger components 60 are connected in series. The heat source system is connected to the common inlet and common outlet of multiple liquid heat exchanger components 60 through a pressurizing pump and connecting pipeline, and is used to supply heat exchange medium into the liquid heat exchanger components 60.

[0063] Specifically, both the liquid thermal component 60 and the heat source system are existing technologies. The heat exchange medium can preferably be hot water. The structure of the liquid thermal component 60 is the same as that of the water-cooled plate. The heat source system introduces hot water into the liquid thermal component 60 to heat the coal.

[0064] In a preferred embodiment of the above embodiments, a hot air system is further included, which includes: a heating shell, an air heating device, a fan device, and a hot air duct;

[0065] The heating shell is located on one side of the mounting shell 1, and its air inlet is connected to the flue gas passage of the power plant boiler; the air heating device is located inside the heating shell and is used to heat the air; the fan device is located inside the heating shell and corresponds to the air heating device, and is used to deliver flue gas to the air heating device; the hot air duct connects the hot air outlet of the heating shell and the inlet of the coal mill, and is used to provide heated flue gas.

[0066] In a preferred embodiment of the above embodiments, a control system is further included, comprising: a temperature detection component one, a temperature detection component two, a temperature detection component three, a temperature detection component four, and a controller; wherein,

[0067] Temperature detection component one is installed at the common inlet of multiple liquid heat exchange components 60 to detect the temperature of the heat exchange medium at the inlet; temperature detection component two is installed at the common outlet of multiple liquid heat exchange components 60 to detect the temperature of the heat exchange medium at the outlet; temperature detection component three is installed inside the hot air duct to detect the temperature of the hot air; temperature detection component four is installed at the outlet of the discharge collection bin 5 to detect the temperature at the outlet; the controller is electrically connected to temperature detection component one, temperature detection component two, temperature detection component three, temperature detection component four, the pressurization pump of the heat source system, and the air heating device.

[0068] It should be noted that temperature detection component 1, temperature detection component 2, temperature detection component 3, and temperature detection component 4 are all existing technologies and can preferably be temperature sensors; the controller is existing technology and can preferably be a PLC controller with programmable functions.

[0069] In a preferred embodiment of the above, the controller can obtain temperature difference data 1 of the heat exchange medium before and after heat exchange based on the temperature data collected by temperature detection component 1 and temperature detection component 2, and control the flow rate of the heat exchange medium supplied by the heat source system based on temperature difference data 1; and control the heating power of the air heating device based on the hot air temperature detected by temperature detection component 3 and the outlet temperature detected by temperature detection component 4.

[0070] It should be noted that during operation, the coal is heated primarily through the hot air system. Initially, the air heating device is in standby mode. Temperature detection components three and four first detect the initial temperature of the boiler flue gas and the temperature of the coal at the outlet after heating by the boiler flue gas. If the outlet coal temperature reaches the preset temperature standard, heating is achieved solely through the boiler flue gas, enabling the reuse of high-temperature flue gas, reducing heating costs, and being more environmentally friendly. If, in this state, the outlet coal fails to reach the preset temperature standard, the air heating device is activated to reheat the flue gas passing through the heating shell until the coal temperature reaches the preset standard. This method still saves a significant amount of energy and reduces heating costs compared to directly heating ambient air. If the air heating device, even at maximum power, still fails to reach the preset temperature standard, the temperature control component is activated for dual temperature-controlled heating of the coal until the preset temperature standard is reached. This method, while ensuring the lowest heating cost, significantly increases the upper limit of coal heating and offers greater flexibility and adaptability.

[0071] In a preferred embodiment of the above embodiments, when controlling the flow rate of the heat exchange medium supplied by the heat exchange medium supply device according to the range value of the temperature difference data one, the range value H of the temperature difference data one is determined, the range value matrix H0 of the temperature difference data one is preset, and H0(H1,H2,H3,H4) is set, where H1 is the first preset range value of the temperature difference data one, H2 is the second preset range value of the temperature difference data one, H3 is the third preset range value of the temperature difference data one, H4 is the fourth preset range value of the temperature difference data one, and H1 < H2 < H3 < H4.

[0072] Determine the flow rate range D of the supplied heat exchange medium, preset the flow rate matrix D0 of the supplied heat exchange medium, and set D0(D1, D2, D3, D4), where D1 is the first preset flow rate of the supplied heat exchange medium, D2 is the second preset flow rate of the supplied heat exchange medium, D3 is the third preset flow rate of the supplied heat exchange medium, D4 is the fourth preset flow rate of the supplied heat exchange medium, and D1 < D2 < D3 < D4.

[0073] Set the flow rate of the supplied heat exchange medium according to the relationship between the range value H of the temperature difference data one and the flow rate of the heat exchange medium supplied by the heat exchange medium supply device:

[0074] When H < H1, select the first preset flow rate D1 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium;

[0075] When H1 ≤ H < H2, select the second preset flow rate D2 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium;

[0076] When H2 ≤ H < H3, select the third preset flow rate D3 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium;

[0077] When H3 ≤ H < H4, select the fourth preset flow rate D4 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium.

[0078] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0079] This application has a dual temperature control system, which can perform dual temperature control through the heat source system and the hot air system, with higher heating efficiency, a larger heating range interval, stronger controllability, and is more conducive to improving work efficiency; and by utilizing the high-temperature flue gas, it can significantly reduce the heating cost, be more energy-saving and environmentally friendly, and is more conducive to the sustainable development of the power plant.

[0080] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, refer to the description of the method part.

[0081] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coal mill outlet temperature control device, characterized in that, include: The housing is installed above the feed inlet of the coal mill; A temporary storage bin is set inside the mounting housing, with its inlet extending out of the mounting housing and at least two outlets; The material feeding component, located inside the temporary storage bin, can push the material discharged into the temporary storage bin into the discharge port of the temporary storage bin; The feeding pipe assembly has at least two inlets and at least two feeding pipes. The inlet and outlet of each feeding pipe are connected to a temporary storage bin and an outlet collection bin. The middle of each feeding pipe is bent or coiled outward to extend its conveying distance. The discharge collection bin is equipped with multiple feed inlets, which are connected to the discharge outlets of the feeding pipe assembly, and their discharge outlets are connected to the feed inlets of the coal mill. A temperature control component, connected to the feeding pipe assembly, controls the temperature of the material within the feeding pipe assembly. The temperature control component includes: liquid heat exchange components, of which at least two are provided, each covering the outside of each feeding pipe. Each liquid heat exchange component has a heat medium pipeline, and the heat medium pipelines of adjacent liquid heat exchange components are connected in series. A heat source system, connected to the common inlet and common outlet of multiple liquid heat exchange components via a pressurization pump and connecting pipelines, is used to supply heat exchange medium to the liquid heat exchange components. The material feeding component includes: a drive motor, which is vertically installed at the bottom of the temporary storage bin, with its output shaft extending into the temporary storage bin; and a material guide, which is located inside the temporary storage bin and connected to the output shaft of the drive motor.

2. A coal mill outlet temperature control device according to claim 1, characterized in that, It also includes a preliminary crushing device connected to the feed inlet of the temporary storage silo, used to initially crush the coal blocks and discharge the crushed coal particles into the temporary storage silo.

3. The coal mill outlet temperature control device according to claim 2, characterized in that, The preliminary crushing device includes: a crushing shell, the inlet and outlet of which are both funnel-shaped structures; The grinding cylinder has openings at both ends, and its outer wall is fixedly connected to the inner wall of the crushing shell through a fixing plate; The grinding body is disposed inside the grinding cylinder, and the corresponding side walls of the grinding cylinder and the grinding body are provided with grinding protrusions for crushing coal. The bottom of the grinding body is connected to a rotating connecting rod, and the bottom of the rotating connecting rod is rotatably connected to a fixed mounting plate, which is fixed to the crushing shell. The crushing motor is mounted on the fixed mounting plate. A worm gear mechanism, wherein the worm gear is connected to the bottom of the rotating connecting rod, and the worm is connected to the output shaft of the crushing motor; A guide plate is inclinedly disposed below the grinding cylinder and connected to the grinding cylinder and the fixed mounting plate.

4. The coal mill outlet temperature control device according to claim 1, characterized in that, It also includes a hot air system, which includes: a heating housing disposed on one side of the mounting housing, the air inlet of which is connected to the flue gas passage of the power plant boiler; An air heating device, installed inside a heating housing, is used to heat air; A fan device is disposed inside the heating housing and corresponds to the air heating device, and is used to supply flue gas to the air heating device; A hot air duct connects the hot air inlet of the heating shell to the inlet of the coal mill, and is used to provide heating flue gas.

5. The coal mill outlet temperature control device according to claim 4, characterized in that, It also includes a control system, which includes: a temperature detection component 1, which is disposed at the common liquid inlet of the plurality of liquid thermal components, for detecting the temperature of the heat exchange medium at the liquid inlet; Temperature detection component two is disposed at the common outlet of the plurality of liquid thermal components and is used to detect the temperature of the heat exchange medium at the outlet. Temperature detection component three is installed inside the hot air duct and is used to detect the temperature of the hot air; Temperature detection component four is installed at the discharge port of the discharge collection bin and is used to detect the discharge port temperature; The controller is electrically connected to the temperature detection component one, temperature detection component two, temperature detection component three, temperature detection component four, the pressurization pump of the heat source system, and the air heating device, respectively.

6. The coal mill outlet temperature control device according to claim 5, characterized in that, The controller can obtain temperature difference data 1 of the heat exchange medium before and after heat exchange based on the temperature data collected by the temperature detection component 1 and the temperature detection component 2, and control the flow rate of the heat source system supplying the heat exchange medium based on the temperature difference data 1. The heating power of the air heating device is controlled based on the hot air temperature detected by temperature detection component three and the outlet temperature detected by temperature detection component four.

7. The coal mill outlet temperature control device according to claim 6, characterized in that, When controlling the flow rate of the heat exchange medium supplied by the heat exchange medium supply device according to the range value of the temperature difference data one, the range value H of the temperature difference data one is determined, the range value matrix H0 of the temperature difference data one is preset, and H0(H1,H2,H3,H4) is set, where H1 is the first preset range value of the temperature difference data one, H2 is the second preset range value of the temperature difference data one, H3 is the third preset range value of the temperature difference data one, H4 is the fourth preset range value of the temperature difference data one, and H1 < H2 < H3 < H4. Determine the flow rate range D of the supplied heat exchange medium, preset the flow rate matrix D0 of the supplied heat exchange medium, and set D0(D1, D2, D3, D4), where D1 is the first preset flow rate of the supplied heat exchange medium, D2 is the second preset flow rate of the supplied heat exchange medium, D3 is the third preset flow rate of the supplied heat exchange medium, D4 is the fourth preset flow rate of the supplied heat exchange medium, and D1 < D2 < D3 < D4. The flow rate of the supplied heat exchange medium is set according to the relationship between the range value H of the temperature difference data and the flow rate of the heat exchange medium supplied by the heat exchange medium supply device: when H < H1, the first preset flow rate D1 of the supplied heat exchange medium is selected as the flow rate of the supplied heat exchange medium. When H1≤H<H2, the flow rate D2 of the second preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium; When H2≤H<H3, the flow rate D3 of the third preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium; When H3≤H<H4, the flow rate D4 of the fourth preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium.

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