A grid cooling device and method for a dry slag discharge machine

Abstract

This application provides a grid cooling device and method for a dry ash discharge machine, applicable to the field of thermal power generation. In this device, a first connecting pipe is sequentially connected to a cooling medium inlet, one end of a first cooling pipe, a first control valve, one end of a second cooling pipe, and one end of a third cooling pipe. A second connecting pipe is sequentially connected to a heat exchanger, a second control valve, the other end of the first cooling pipe, the other end of the second cooling pipe, the third control valve, and the other end of the third cooling pipe. One end of the third connecting pipe is connected to both the second and third cooling pipes, and the other end is connected to the second connecting pipe between the second control valve and the heat exchanger. A fourth control valve is located on the third connecting pipe. This method is based on this device. It achieves rapid cooling of ash blocks while avoiding excessive cold air entering the furnace, which could lead to a decrease in boiler efficiency. Furthermore, it allows for series-parallel switching of the cooling medium flow direction according to actual operating conditions.

Description

Technical Field

[0001] This application relates to the field of thermal power generation technology, and in particular to a grid cooling device and method for a dry ash discharge machine. Background Technology

[0002] In recent years, building a new power system with new energy as the main body has become the current trend. The rapid development of new energy has led to a continuous decrease in the proportion of thermal power units, and the number of power generation utilization hours has been declining year by year. The peak-shaving operation of the units is becoming more frequent, and the minimum peak-shaving operation load is constantly decreasing, which places increasingly higher demands on the stable operation of thermal power units.

[0003] A grid plate is designed below the hydraulic shut-off valve at the bottom of the boiler slag well to prevent large coke lumps from falling into the steel belt and causing the dry slag discharge machine to stop. During unit operation, the hydraulic shut-off valve is always in the fully open position. When large coke lumps fall into the grid plate, the hydraulic shut-off valve must be used in time to crush the coke lumps into smaller pieces so that they can be sent out by the steel belt.

[0004] In existing technologies, air cooling or spraying is mainly used to cool the slag. Spraying consumes a large amount of water and generates a significant amount of steam, impacting the boiler's lifespan and stable operation. Air cooling utilizes cooling dampers at the bottom of the steel belt to regulate airflow and cool the slag. However, under high load, the hydraulic shut-off valve remains fully open, allowing excessive, unorganized air leakage into the furnace. This leads to excessive air leakage at the furnace bottom, increasing the boiler flame core height, increasing heat absorption from the leaking air, and consequently raising the flue gas temperature and reducing unit efficiency.

[0005] Therefore, there is an urgent need for a way to cool the slag blocks while preventing them from affecting boiler operation. Summary of the Invention

[0006] In view of the problems in the prior art, this application provides a grid cooling device and method for a dry slag discharge machine, which can at least partially solve the problems existing in the prior art.

[0007] In a first aspect, this application provides a grid cooling device for a dry slag discharge machine, comprising: a heat exchanger, a first cooling pipe, a second cooling pipe, a third cooling pipe, a first connecting pipe, a second connecting pipe, a third connecting pipe, a first control valve, a second control valve, a third control valve, and a fourth control valve; One end of the first connecting pipe is connected to the cooling medium inlet, and the other end is connected to one end of the third cooling pipe. The first control valve is located on the first connecting pipe. One end of the first cooling pipe and one end of the second cooling pipe are respectively connected to the first connecting pipe and located on both sides of the first control valve. One end of the second connecting pipe is connected to the heat exchanger, and the other end is connected to the other end of the third cooling pipe and one end of the third connecting pipe. The second control valve and the third control valve are installed on the second connecting pipe. The other ends of the first cooling pipe and the second cooling pipe are respectively connected to the second connecting pipe between the second control valve and the third control valve. The other end of the third connecting pipe is connected to the second connecting pipe between the second control valve and the heat exchanger, and the fourth control valve is located on the third connecting pipe.

[0008] When the first control valve, the second control valve, and the third control valve are open, and the fourth control valve is closed, the first cooling pipe, the second cooling pipe, and the third cooling pipe are connected in parallel.

[0009] When the first control valve, the second control valve, and the third control valve are closed, and the fourth control valve is open, the first cooling pipe, the second cooling pipe, and the third cooling pipe are connected in series.

[0010] The first, second, and third cooling pipes are arranged in an S-shape.

[0011] The cooling medium is a liquid medium, and the system also includes a booster pump and a pressure-stabilizing water tank. The cooling medium inlet is connected to the outlet of the booster pump, the heat exchanger is connected to the inlet of the booster pump, and the booster pump is connected to the pressure-stabilizing water tank.

[0012] The cooling medium is a gaseous medium, and the system also includes a cooling fan, with the cooling medium inlet connected to the cooling fan.

[0013] It also includes a main valve, which is located between the first end of the first cooling pipe and the inlet of the cooling medium.

[0014] This also includes: The server controls the opening and closing of the first control valve, the second control valve, the third control valve, and the fourth control valve based on at least one of the following: slag temperature, unit load, and coal quantity in the pulverizer.

[0015] Secondly, this application provides a method for cooling the grid of a dry slag discharge machine, implemented based on the dry slag discharge machine grid cooling device described in any of the above embodiments, comprising: The temperature of the slag well and the preset slag temperature threshold are obtained, and the amount of radiation to be absorbed in the furnace is determined based on the temperature of the slag well and the preset slag temperature threshold. The air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace are obtained. The heat absorption of air leakage at the bottom of the furnace is determined based on the air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace. The minimum flow rate of the cooling medium is determined based on the amount of radiation to be absorbed in the furnace chamber and the amount of heat absorbed by air leakage at the furnace bottom. The flow rate of the cooling medium inlet is adjusted according to the minimum flow rate of the cooling medium.

[0016] The step of determining the minimum flow rate of the cooling medium based on the radiation amount in the furnace to be absorbed and the heat absorption from air leakage at the furnace bottom includes:

[0017] The minimum heat absorption of the cooling medium is determined based on the radiation amount in the furnace to be absorbed and the heat absorption of air leakage at the furnace bottom. The first temperature of the cooling medium at the inlet and the second temperature of the cooling medium before it enters the heat exchanger are obtained, and the minimum flow rate of the cooling medium is determined based on the first temperature and the second temperature.

[0018] The dry slag discharge machine grid cooling device and method provided in this application comprises a heater, a first cooling pipe, a second cooling pipe, a third cooling pipe, a first connecting pipe, a second connecting pipe, a third connecting pipe, a first control valve, a second control valve, a third control valve, and a fourth control valve; wherein one end of the first connecting pipe is connected to the cooling medium inlet, and the other end is connected to one end of the third cooling pipe; the first control valve is disposed on the first connecting pipe; one end of the first cooling pipe and one end of the second cooling pipe are respectively connected to the first connecting pipe and located on both sides of the first control valve; one end of the second connecting pipe... One end is connected to the heat exchanger, and the other end is connected to the other end of the third cooling pipe and one end of the third connecting pipe. The second and third control valves are located on the second connecting pipe. The other ends of the first and second cooling pipes are respectively connected to the second connecting pipe between the second and third control valves. The other end of the third connecting pipe is connected to the second connecting pipe between the second control valve and the heat exchanger. A fourth control valve is located on the third connecting pipe. This system achieves rapid cooling of the slag while preventing excessive cold air from entering the furnace, which could lead to increased flue gas temperature and decreased boiler efficiency. The flow pattern of the cooling medium in the cooling pipes can be determined based on the actual conditions such as boiler load and slag volume, thereby selecting a suitable cooling method and realizing the reuse of slag heat, further improving energy utilization efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of a boiler ash removal device equipped with the grid cooling device of the dry ash removal machine provided in some embodiments of this application; Figure 2 This is a schematic diagram of a boiler ash removal device equipped with the grid cooling device of the dry ash removal machine provided in some embodiments of this application; Figure 3 This is a schematic diagram of a conventional grid structure in the prior art; Figure 4 This is a schematic diagram of the structure of the grid cooling device for a dry slag discharge machine provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of the grid cooling device for a dry slag discharge machine provided in some embodiments of this application; Figure 6 This is a flowchart of a dry slag discharger grid cooling method provided in some embodiments of this application; Figure 7 This is a flowchart of a dry slag discharge machine grid cooling method provided in some embodiments of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0022] Figure 1 and Figure 2 This is a schematic diagram of a boiler ash removal device with the grid cooling device of the dry ash removal machine provided in some embodiments of this application, such as... Figure 1 and Figure 2 As shown, the boiler ash removal device includes a grid 100, an ash well 200, a hydraulic shut-off valve 300, a dry ash removal machine 400, and an ash bin 500. Conventional grid plates used in existing technologies, such as... Figure 3 As shown, there are two main types: grid-like and columnar. 100a is a grid-like grid plate, and 100b is a columnar grid plate. However, regardless of whether it's grid-like or columnar, the existing technology uses independent grid plates, which are often solid and do not have the function of cooling slag blocks. The dry slag discharge machine grid cooling device provided in this application replaces the grid plates used in existing boiler slag discharge devices with pipes through which the cooling medium flows. This allows the slag blocks to be rapidly cooled after falling onto the grid plates, thereby reducing the air intake and enabling the hydraulic shut-off valve to quickly squeeze out the slag. To prevent damage from slag blocks, each cooling pipe should have a certain load-bearing capacity and should be made of sturdy materials with good thermal conductivity.

[0023] Figure 4 and Figure 5 This is a schematic diagram of the structure of the grid cooling device for a dry slag discharge machine provided in some embodiments of this application, such as... Figure 4 and Figure 5 As shown, the dry slag discharge machine grid cooling device provided in this application includes: a heat exchanger 101, a first cooling pipe 102, a second cooling pipe 103, a third cooling pipe 104, a first connecting pipe 105, a second connecting pipe 106, a third connecting pipe 107, a first control valve 108, a second control valve 109, a third control valve 110, and a fourth control valve 111; One end of the first connecting pipe 105 is connected to the cooling medium inlet 112, and the other end is connected to one end of the third cooling pipe 104. The first control valve 108 is installed on the first connecting pipe 105. One end of the first cooling pipe 102 and the second cooling pipe 103 are respectively connected to the first connecting pipe 105 and located on both sides of the first control valve 108. Specifically, the connection points of the first cooling pipe 102 and the second cooling pipe 103 and the first connecting pipe 105 are spaced apart, and the connection point of the second cooling pipe 103 and the first connecting pipe 105 is located between the connection point of the first cooling pipe 102 and the first connecting pipe 105 and the connection point of the third cooling pipe 104 and the first connecting pipe 105.

[0024] One end of the second connecting pipe 106 is connected to the heat exchanger 101, and the other end is connected to the other end of the third cooling pipe 104 and one end of the third connecting pipe 107. The second control valve 109 and the third control valve 110 are arranged on the second connecting pipe. The other ends of the first cooling pipe 102 and the second cooling pipe 103 are respectively connected to the second connecting pipe 106 between the second control valve 109 and the third control valve 110. Specifically, the second connecting pipe 106, the third cooling pipe 104, and the third connecting pipe 107 are interconnected. The second control valve 109 and the third control valve 110 are located between the connection point of the second connecting pipe 106 and the third cooling pipe 104 and the heat exchanger 101, with the second control valve 109 closer to the end connected to the heat exchanger 101 and the third control valve 110 closer to the end connected to the third cooling pipe 104. The connection point of the second cooling pipe 103 and the second connecting pipe 106 is closer to the end where the second connecting pipe 106 and the third cooling pipe 104 connect compared to the connection point of the first cooling pipe 102 and the second connecting pipe 106.

[0025] The other end of the third connecting pipe 107 is connected to the second connecting pipe 106 between the second control valve 109 and the heat exchanger 101, and the fourth control valve 111 is installed on the third connecting pipe 107.

[0026] Specifically, one end of the third connecting pipe 107 is connected to the second connecting pipe 106 and the third cooling pipe 104, and the other end is also connected to the second connecting pipe 106. The connection point is located between the second control valve 109 and the heat exchanger 101, and is connected to the heat exchanger 101 through the second connecting pipe 106.

[0027] Based on the above embodiments, further, such as Figure 4 and Figure 5 As shown, the first cooling pipe 102, the second cooling pipe 103 and the third cooling pipe 104 are arranged in an S-shape.

[0028] Specifically, the cooling pipes are configured in a one-to-one correspondence with the hydraulic shut-off valves, with the first cooling pipe 102, the second cooling pipe 103, and the third cooling pipe 104 respectively installed in... Figure 1 or Figure 2 Below the three hydraulic shut-off gates 300, each serves as a grid plate. The S-shaped arrangement increases the contact area between the slag and each cooling pipe, resulting in better cooling.

[0029] The dry slag discharge machine grid cooling device provided in this application comprises a heat exchanger, a first cooling pipe, a second cooling pipe, a third cooling pipe, a first connecting pipe, a second connecting pipe, a third connecting pipe, a first control valve, a second control valve, a third control valve, and a fourth control valve. One end of the first connecting pipe is connected to the cooling medium inlet, and the other end is connected to one end of the third cooling pipe. The first control valve is located on the first connecting pipe. One end of the first cooling pipe and the second cooling pipe are respectively connected to the first connecting pipe, located on either side of the first control valve. One end of the second connecting pipe is connected to the heat exchanger, and the other end is connected to the other end of the third cooling pipe and one end of the third connecting pipe. The second control valve and the third control valve are located on the second connecting pipe. The other ends of the first cooling pipe and the second cooling pipe are respectively connected to the second connecting pipe between the second control valve and the third control valve. The other end of the third connecting pipe is connected to the second connecting pipe between the second control valve and the heat exchanger. The fourth control valve is located on the third connecting pipe. This device achieves rapid cooling of the slag while preventing excessive cold air from entering the furnace, which would lead to increased flue gas temperature and decreased boiler efficiency.

[0030] In some embodiments, such as Figure 4 As shown, when the first control valve 108, the second control valve 109, and the third control valve 110 are open, and the fourth control valve 111 is closed, the first cooling pipe 102, the second cooling pipe 103, and the third cooling pipe 104 are connected in parallel.

[0031] Specifically, the opening and closing of each control valve can be controlled according to the boiler load, slag volume, etc., thereby achieving the switching between series and parallel connection states of each cooling pipe. When the cooling pipes switch from series to parallel connection, the first control valve 108, the second control valve 109, and the third control valve 110 can be opened, and the fourth control valve 111 can be closed. At this time, the flow direction of the cooling medium is as follows: Figure 4 As shown, the cooling medium flows into the first connecting pipe 105 from the cooling medium inlet 112, and then flows into one end of the first cooling pipe 102, the second cooling pipe 103, and the third cooling pipe 104 respectively. After flowing out from the other end of each cooling pipe, it flows into the heat exchanger 101 through the second connecting pipe. When the slag volume is large and the slag temperature is high, by connecting the cooling pipes in parallel, it can be ensured that all slag blocks can come into contact with the cooler cooling medium, thereby achieving rapid cooling of the slag blocks and ensuring a better cooling effect.

[0032] The conditions for switching between series and parallel cooling pipelines can be set according to actual conditions, such as when the unit load is greater than the preset load value, or when the slag well temperature is greater than the preset temperature value. This application does not impose any restrictions on this.

[0033] After the cooling medium carrying the heat of the slag enters the heat exchanger 101, it can be used to heat the primary and secondary air heaters of the boiler, the heat tracing of the denitrification urea pipeline, the boiler zero-meter heating, etc., thereby realizing the reuse of heat, further saving energy and improving unit efficiency.

[0034] In some embodiments, such as Figure 5 As shown, when the first control valve 108, the second control valve 109, and the third control valve 110 are closed, and the fourth control valve 111 is open, the first cooling pipe 102, the second cooling pipe 103, and the third cooling pipe 104 are connected in series.

[0035] Specifically, when the parallel connection of the cooling pipes switches to a series connection, the first control valve 108, the second control valve 109, and the third control valve 110 can be closed, and the fourth control valve 111 can be opened. At this time, the flow direction of the cooling medium is as follows: Figure 5 As shown, the cooling medium flows into the first connecting pipe 105 from the cooling medium inlet 112, then flows into one end of the first cooling pipe 102, exits from the other end of the first cooling pipe 102, flows into the second cooling pipe 103 via the second connecting pipe 106, and then flows into the third cooling pipe 104 after exiting the second cooling pipe 103. After exiting the third cooling pipe 104, it flows into the heat exchanger 101 via the third connecting pipe 107. When the slag volume is small, by connecting the cooling pipes in series, the contact time between the cooling medium and the slag can be increased, thereby ensuring that the cooling medium is fully heated and can be reused later.

[0036] The dry ash discharge machine grid cooling device provided in this application, by controlling the opening and closing of the first control valve 108, the second control valve 109, the third control valve 110 and the fourth control valve 111, realizes the rational control of the flow mode of the cooling medium according to the actual situation such as boiler load and ash quantity, ensuring that the ash blocks can be fully cooled under various working conditions, and ensuring that the cooling medium fully absorbs heat, realizing the secondary utilization of heat, and further improving energy utilization efficiency.

[0037] In one embodiment, the cooling medium is a liquid medium, such as... Figure 1 As shown, the dry slag discharge machine grid cooling device provided in this application also includes: a booster pump 113 and a pressure stabilizing water tank 114; The cooling medium inlet 112 is connected to the outlet of the booster pump 113, the heat exchanger 101 is connected to the inlet of the booster pump 113, and the booster pump 113 is connected to the pressure stabilizing water tank 114.

[0038] Specifically, the cooled water, after passing through heat exchanger 101, returns to the inlet of booster pump 113, forming a closed loop. The pressure-stabilizing water tank 114 replenishes liquid media lost due to leakage or evaporation, ensuring the safe operation of booster pump 113. Booster pump 113 can be designed as a fixed-frequency pump with a regulating valve at the pump outlet to adjust the water flow; alternatively, it can be designed as a variable-frequency pump, adjusting the water flow itself.

[0039] In another embodiment, the cooling medium is a gaseous medium, in which case, such as Figure 2 As shown, the dry slag discharge machine grid cooling device provided in this application further includes: a cooling fan 115, and a cooling medium inlet 112 connected to the cooling fan 115.

[0040] Specifically, heat exchanger 101 can be connected to cooling fan 115. In this case, the cooled air returns to the inlet of cooling fan 115 after passing through heat exchanger 101, forming a closed loop. Alternatively, heat exchanger 101 can be disconnected from cooling fan 115, with cooling fan 115 directly drawing in gas from the environment as the cooling medium. Cooling fan 115 can be designed as a fixed-frequency fan, with a regulating damper added at the outlet to adjust the airflow; or it can be designed as a variable-frequency fan, adjusting the airflow itself.

[0041] The dry slag discharge machine grid cooling device provided in this application provides different types of cooling media by setting up a booster pump and a pressure stabilizing water tank or cooling fan, and ensures the flow rate of the cooling media, thereby further ensuring the stability of the cooling device operation.

[0042] In one embodiment, such as Figure 1 and Figure 2As shown, the dry slag discharge machine grid cooling device provided in this application further includes: a main valve 116, which is disposed between the first end of the first cooling pipe 102 and the cooling medium inlet 112. The flow rate of the cooling medium can be further adjusted by controlling the opening degree of the main valve 116.

[0043] In one embodiment, the dry slag discharge machine grid cooling device provided in this application further includes: The server (not shown) controls the opening and closing of the first control valve 108, the second control valve 109, the third control valve 110, and the fourth control valve 111 based on at least one of the following: slag temperature, unit load, and coal quantity in the pulverizer.

[0044] Specifically, the opening and closing of each control valve can be controlled according to the boiler load, slag volume, etc., thereby achieving the switching between series and parallel connection states of each cooling pipeline. For example, when the unit load is less than 50%, a series connection is used; when the unit load is greater than or equal to 50%, a parallel connection is used. However, this application is not limited to this, and the switching conditions and thresholds for series and parallel connection can be set according to the actual situation. In addition, the opening and closing of each control valve can also be controlled manually.

[0045] The dry slag discharge machine grid cooling device provided in this application achieves timely and automatic control of the opening and closing status of each valve by setting up a server, thereby realizing automatic switching of the flow direction of the cooling medium.

[0046] Based on the same inventive concept, this application also provides a method for cooling the grid of a dry slag discharger, which can be implemented based on the apparatus described in the above embodiments, as described in the following embodiments. Since the principle of solving the problem by the dry slag discharger grid cooling method is similar to that of the dry slag discharger grid cooling device, the implementation of the dry slag discharger grid cooling method can refer to the implementation of the method based on software performance benchmarks, and the repeated parts will not be described again.

[0047] The following describes the specific implementation process of the dry slag discharge machine grid cooling method provided in this embodiment of the invention, using a server as the execution subject as an example.

[0048] Figure 6 This is a flowchart of a dry slag discharger grid cooling method provided in some embodiments of this application, such as... Figure 6 As shown, the dry slag discharger grid cooling method provided in this application includes: S601: Obtain the slag well temperature and preset slag temperature threshold, and determine the amount of radiation to be absorbed in the furnace based on the slag well temperature and preset slag temperature threshold; S602: Obtain the air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace; determine the heat absorption of air leakage at the bottom of the furnace based on the air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace. S603: Determine the minimum flow rate of the cooling medium based on the radiation in the furnace to be absorbed and the heat absorption from air leakage at the furnace bottom; S604: Adjust the flow rate of the cooling medium inlet according to the minimum flow rate of the cooling medium.

[0049] The dry slag discharger grid cooling method provided in this application obtains the slag well temperature and a preset slag temperature threshold, and determines the amount of furnace radiation to be absorbed based on the slag well temperature and the preset slag temperature threshold; obtains the air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace, and determines the heat absorption of the leaking air at the bottom of the furnace based on the air temperature before the grid, the air temperature after the grid, and the air volume of the leaking air at the bottom of the furnace; determines the minimum flow rate of the cooling medium based on the amount of furnace radiation to be absorbed and the heat absorption of the leaking air at the bottom of the furnace; and adjusts the flow rate of the cooling medium inlet based on the minimum flow rate of the cooling medium. This method achieves rapid cooling of the slag blocks while allowing selection of appropriate cooling medium flow rates according to different operating conditions, further ensuring the cooling effect of the slag blocks.

[0050] The following is a detailed explanation of each step: S601: Obtain the slag well temperature and preset slag temperature threshold, and determine the amount of radiation to be absorbed in the furnace based on the slag well temperature and preset slag temperature threshold; Specifically, a temperature sensor can be installed in the slag well to obtain the slag well temperature. Let the slag well temperature be T0, and the preset slag temperature threshold be T1. Then, the amount of radiation to be absorbed from the furnace can be expressed by the following formula: Q1=ε×σ×(T0 4 - T1 4 (1) Where Q1 is the amount of radiation to be absorbed from the furnace, and ε and σ are constants related to the properties of the slag.

[0051] S602: Obtain the air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace; determine the heat absorption of air leakage at the bottom of the furnace based on the air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace. Specifically, the air temperature before the grid, the air temperature after the grid, and the air volume in the slag well at the bottom of the furnace can also be obtained through temperature sensors, wind speed sensors, etc., at different locations. Let the air temperature before the grid be T2, the air temperature after the grid be T3, and the air volume in the slag well at the bottom of the furnace be m2, then the heat absorption due to air leakage at the bottom of the furnace can be expressed by the following formula: Q2=C p ×m2(T2-T3) (2) Where Q2 is the heat absorbed by air leakage at the furnace bottom, and C p This refers to the specific heat capacity of the gas entering from the bottom of the furnace.

[0052] S603: Determine the minimum flow rate of the cooling medium based on the radiation in the furnace to be absorbed and the heat absorption from air leakage at the furnace bottom; Specifically, the total heat absorption of the furnace bottom air leakage and the cooling medium should be greater than or equal to the radiation of the furnace to be absorbed. Therefore, the minimum heat absorption of the cooling medium can be determined based on the radiation of the furnace to be absorbed and the heat absorption of the furnace bottom air leakage, and then the minimum flow rate of the cooling medium can be determined.

[0053] In one embodiment, such as Figure 7 As shown, S603 includes: S701: Determine the minimum heat absorption of the cooling medium based on the radiation in the furnace to be absorbed and the heat absorption of air leakage at the furnace bottom; Specifically, if the minimum heat absorption of the cooling medium is Q3, then Q3 can be calculated using the following formula: Q3 = Q1 - Q2 (3) S702: Obtain the first temperature of the cooling medium at the cooling medium inlet and the second temperature of the cooling medium before entering the heat exchanger, and determine the minimum flow rate of the cooling medium based on the first temperature and the second temperature.

[0054] Specifically, the first temperature and inlet pressure can be obtained by temperature and pressure sensors installed at the inlet of the cooling medium, respectively, and the second temperature can be determined by a temperature sensor installed before the heat exchanger. Let the first temperature be T4, the second temperature be T5, and the inlet pressure be P1, then the minimum flow rate of the cooling medium can be determined by the following formula: Q3 = (h2 - h1) × m1 (4) h2-h1=(U1+ P1V)-(U2+ P1V) (5) U1 - U2 = m1C(T5 - T4) (6) Where m1 is the minimum flow rate of the cooling medium, h1 is the inlet enthalpy of the cooling medium, h2 is the outlet enthalpy of the cooling medium, U1 is the internal energy of the cooling medium at the inlet, U2 is the internal energy of the cooling medium at the outlet, V is the unit volume, and C is the specific heat capacity of the cooling medium. The minimum flow rate of the cooling medium can be determined by combining formulas (4)-(5).

[0055] S604: Adjust the flow rate of the cooling medium inlet according to the minimum flow rate of the cooling medium.

[0056] Specifically, the server can adjust the opening of the main inlet valve and the booster pump or cooling fan based on the calculated minimum flow rate of the cooling medium, thereby regulating the inlet flow rate of the cooling medium and ensuring that the inlet flow rate is not less than the minimum flow rate of the cooling medium. Furthermore, the server can also control the series and parallel connection status of the cooling medium based on the minimum heat absorption of the cooling medium, the minimum flow rate of the cooling medium, and preset threshold values.

[0057] The dry slag discharger grid cooling method provided in this application obtains the slag well temperature and a preset slag temperature threshold, and determines the amount of furnace radiation to be absorbed based on the slag well temperature and the preset slag temperature threshold; obtains the air temperature before the grid, the air temperature after the grid, and the air volume of the slag well at the bottom of the furnace, and determines the heat absorption of the leaking air at the bottom of the furnace based on the air temperature before the grid, the air temperature after the grid, and the air volume of the leaking air at the bottom of the furnace; determines the minimum flow rate of the cooling medium based on the amount of furnace radiation to be absorbed and the heat absorption of the leaking air at the bottom of the furnace; and adjusts the flow rate of the cooling medium inlet based on the minimum flow rate of the cooling medium. This method achieves rapid cooling of the slag blocks while allowing selection of appropriate cooling medium flow rates according to different operating conditions, further ensuring the cooling effect of the slag blocks.

[0058] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0059] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0060] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0061] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0062] In the description of this specification, the references to terms such as "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A grid cooling device for a dry slag discharge machine, characterized in that, include: Heat exchanger, first cooling pipe, second cooling pipe, third cooling pipe, first connecting pipe, second connecting pipe, third connecting pipe, first control valve, second control valve, third control valve, fourth control valve and server; One end of the first connecting pipe is connected to the cooling medium inlet, and the other end is connected to one end of the third cooling pipe. The first control valve is located on the first connecting pipe. One end of the first cooling pipe and one end of the second cooling pipe are respectively connected to the first connecting pipe and located on both sides of the first control valve. One end of the second connecting pipe is connected to the heat exchanger, and the other end is connected to the other end of the third cooling pipe and one end of the third connecting pipe. The second control valve and the third control valve are installed on the second connecting pipe. The other ends of the first cooling pipe and the second cooling pipe are respectively connected to the second connecting pipe between the second control valve and the third control valve. The other end of the third connecting pipe is connected to the second connecting pipe between the second control valve and the heat exchanger, and the fourth control valve is disposed on the third connecting pipe; The server controls the opening and closing of the first control valve, the second control valve, the third control valve and the fourth control valve based on at least one of the following: slag temperature, unit load and coal quantity in the coal mill. When the first control valve, the second control valve, and the third control valve are open, and the fourth control valve is closed, the first cooling pipe, the second cooling pipe, and the third cooling pipe are connected in parallel. When the first control valve, the second control valve, and the third control valve are closed, and the fourth control valve is open, the first cooling pipe, the second cooling pipe, and the third cooling pipe are connected in series.

2. The dry slag discharge machine grid cooling device according to claim 1, characterized in that, The first, second, and third cooling pipes are arranged in an S-shape.

3. The dry slag discharge machine grid cooling device according to claim 1, characterized in that, The cooling medium is a liquid medium, and it also includes: a booster pump and a pressure-stabilizing water tank; The cooling medium inlet is connected to the outlet of the booster pump, the heat exchanger is connected to the inlet of the booster pump, and the booster pump is connected to the pressure-stabilizing water tank.

4. The dry slag discharge machine grid cooling device according to claim 1, characterized in that, The cooling medium is a gaseous medium, and the system also includes a cooling fan, with the cooling medium inlet connected to the cooling fan.

5. The dry slag discharge machine grid cooling device according to claim 1, characterized in that, Also includes: The main valve is located between the first end of the first cooling pipe and the inlet of the cooling medium.

6. A method for cooling the grid of a dry slag discharge machine, implemented based on the grid cooling device for a dry slag discharge machine according to any one of claims 1-5, characterized in that, include: Obtain the slag well temperature and a preset slag temperature threshold. Based on the slag well temperature and the preset slag temperature threshold, determine the amount of radiation to be absorbed from the furnace using the following formula: Q1=ε×σ×(T0 4 - T1 4 ) ; Where Q1 is the amount of radiation to be absorbed in the furnace, T0 is the temperature of the slag well, T1 is the preset slag temperature threshold, and ε and σ are constants related to the properties of the slag blocks; Obtain the air temperature before the grid, the air temperature after the grid, and the air volume in the slag well at the bottom of the furnace. Based on the air temperature before the grid, the air temperature after the grid, and the air volume in the slag well at the bottom of the furnace, determine the heat absorption due to air leakage at the bottom of the furnace using the following formula: Q2=C p ×m2(T2-T3) ; Where Q2 is the heat absorption of air leakage at the furnace bottom, T2 is the air temperature before the grid, T3 is the air temperature after the grid, and C p m2 represents the specific heat capacity of the gas entering from the bottom of the furnace, and m2 represents the air intake volume of the slag well at the bottom of the furnace. The minimum heat absorption of the cooling medium is determined using the following formula based on the radiation amount in the furnace to be absorbed and the heat absorption of air leakage at the furnace bottom: Q3 = Q1 - Q2; Wherein, Q3 is the minimum heat absorption of the cooling medium; The first temperature of the cooling medium at the cooling medium inlet and the second temperature of the cooling medium before entering the heat exchanger are obtained. The minimum flow rate of the cooling medium is determined based on the first temperature and the second temperature using the following formula: Q3 = (h2 - h1) × m1; h2-h1=(U1+ P1V)-(U2+ P1V); U1 - U2 = m1C(T5 - T4); Where m1 is the minimum flow rate of the cooling medium, h1 is the inlet enthalpy of the cooling medium, h2 is the outlet enthalpy of the cooling medium, U1 is the internal energy of the cooling medium at the inlet, U2 is the internal energy of the cooling medium at the outlet, V is the unit volume, C is the specific heat capacity of the cooling medium, P1 is the inlet pressure, T4 is the first temperature, and T5 is the second temperature. The flow rate of the cooling medium inlet is adjusted according to the minimum flow rate of the cooling medium.

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