Sintering furnace waste heat recovery device

Abstract

The utility model belongs to technical field especially relates to sintering furnace waste heat recovery device, it is including: sintering furnace body, it is equipped with stove cavity in it, heat exchange water tank is set up in sintering furnace body top, and the bottom of heat exchange water tank is equipped with heat exchange pipe, and heat exchange pipe penetrates stove cavity, waste heat power generation unit utilizes the heat of waste gas to generate electricity, air inlet pipeline is connected with heat exchange water tank in one end, and is connected with waste heat power generation unit in the other end, filter assembly is set up in air inlet pipeline, the filter assembly includes: filter pipe is linked with air inlet pipeline and heat exchange water tank, filter piece is set up in filter pipe inside, drain plug is connected with filter pipe inner wall thread, clamping groove is set up on filter piece, clamping portion is set up on drain plug, and clamping portion is clamped into clamping groove. The utility model provides a kind of sintering furnace waste heat recovery device, which can filter high-temperature gas to ensure the normal use of components.

Description

Technical Field

[0001] This utility model belongs to the technical field, and in particular relates to a waste heat recovery device for sintering furnaces. Background Technology

[0002] In modern industrial production, sintering furnaces, as important heat treatment equipment, are widely used in industries such as ceramics and powder metallurgy. During operation, the furnace cavity generates a large amount of high-temperature waste heat. Direct discharge of this waste heat not only results in significant energy waste but also causes thermal pollution to the environment. Therefore, installing waste heat recovery devices at the top of the sintering furnace cavity to utilize the waste heat for preheating materials, heating domestic water, or other process steps has become an important measure for achieving energy conservation, emission reduction, and improving energy efficiency.

[0003] However, existing sintering furnace waste heat recovery devices on the market generally suffer from a key technical deficiency: they typically lack corresponding filtration devices and impurity filtration capabilities. During the sintering process, high-temperature gases containing impurities such as dust, particulate matter, and corrosive gases are generated within the furnace cavity. These unfiltered gases can enter the electrical components of the recovery device during waste heat recovery. Dust and particulate matter may deposit on the surface of electrical components, affecting heat dissipation and causing components to overheat, leading to performance degradation or even damage. Corrosive gases can react chemically with the metal parts of electrical components, accelerating corrosion and aging, and significantly shortening their lifespan. This not only increases equipment maintenance costs and downtime, reducing production efficiency, but also may pose safety hazards, severely hindering the further promotion and application of sintering furnace waste heat recovery technology. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a sintering furnace waste heat recovery device capable of filtering high-temperature gases to ensure the normal operation of components.

[0005] In view of this, the present invention provides a waste heat recovery device for sintering furnaces, comprising:

[0006] The sintering furnace body has a furnace cavity inside;

[0007] The hot water tank is located at the top of the sintering furnace body. The bottom of the hot water tank is equipped with heat exchange tubes that penetrate the furnace cavity.

[0008] Waste heat power generation unit uses the heat from waste gas to generate electricity;

[0009] The air intake pipe is connected to the hot water tank at one end and to the waste heat power generation unit at the other end.

[0010] The filter assembly is located inside the intake pipe;

[0011] The filtering component includes:

[0012] The filter tube is connected to the air inlet pipe and the hot water tank.

[0013] Filter element, installed inside the filter tube;

[0014] The drain plug is threaded to the inner wall of the filter tube.

[0015] The slot is located on the filter element;

[0016] The snap-fit ​​part is provided on the drain plug and snaps into the slot.

[0017] In the above technical solution, the filter tube further includes an air inlet channel, a filter channel, and an air supply channel. The air inlet channel is connected to the hot water exchange tank and the filter channel is connected. The filter element is installed in the filter channel, and the air supply channel is connected to the air inlet pipeline.

[0018] In any of the above technical solutions, the filter element is a circular mesh structure, which is disposed inside the filter channel, and the drain plug is located at the end of the filter channel and is threadedly connected to the inner wall of the filter channel.

[0019] In any of the above technical solutions, a sealing ring is further provided on the outside of both the filter element and the drain plug, and the sealing ring is in contact with the inner diameter of the filter channel.

[0020] In any of the above technical solutions, the waste heat power generation unit further includes:

[0021] The evaporator is connected to the intake pipe;

[0022] The cylindrical body is connected to the evaporator;

[0023] The generator is located outside the cylinder.

[0024] Storage battery, connected to the generator;

[0025] The condenser is connected to the generator;

[0026] The pump is connected to the condenser at one end and the evaporator at the other.

[0027] The cooling system is located outside the generator;

[0028] The control unit is electrically connected to both the cooling system and the generator.

[0029] In any of the above technical solutions, the control unit further includes a temperature sensor and a controller. The temperature sensor detects the temperature of the generator; the controller compares the temperature value detected by the temperature sensor with a preset value and controls the operating state of the cooling system based on the comparison result.

[0030] In any of the above technical solutions, the cylinder body is further provided with fins, and the fins become narrower along the direction of the condenser.

[0031] The beneficial effects of this utility model are:

[0032] 1. By connecting the heat exchange tubes in the hot water tank to the furnace chamber, the waste heat is first used to heat the water in the tank, thus realizing the conversion of heat energy; then, with the help of the waste heat power generation unit, the waste heat of the exhaust gas after heat exchange is further utilized to convert the heat energy into electrical energy, thereby achieving multi-stage recovery of waste heat, improving energy utilization efficiency, and reducing energy waste.

[0033] 2. By intercepting impurities through filter elements, the waste gas containing impurities entering from the furnace cavity is filtered. The circular structure of the filter elements is better adapted to the filter channel, so that when the waste gas flows in the filter channel, it can come into contact with the mesh filter elements in all directions, increasing the contact area between the waste gas and the filter elements, preventing impurities from entering subsequent waste heat power generation units and other equipment, protecting the normal operation of electrical components and equipment, and reducing the risk of equipment damage and maintenance costs caused by impurities.

[0034] 3. The drain plug is located at the end of the filter channel and is threaded to the inner wall. By rotating and unscrewing the drain plug, the filter element can be taken out from the filter tube together. This allows for convenient cleaning of the filter element or direct replacement of the new filter element. The operation is simple, reducing maintenance difficulty and cost, and ensuring long-term stable operation of the filter assembly.

[0035] 4. A sealing ring is installed on the outside of the filter element and the drain plug, which contacts the inner diameter of the filter channel. This can fill the gaps between the filter element, the drain plug and the inner wall of the filter channel, prevent the exhaust gas from leaking from these gaps when it flows in the filter channel, ensure that all the exhaust gas passes through the filter element, improve the filtration effect, and at the same time prevent unfiltered exhaust gas from directly entering the subsequent system, thus protecting the equipment.

[0036] 5. By coordinating components such as evaporator, cylinder, and generator, the waste heat in the sintering furnace exhaust gas is converted into the internal energy of the working medium steam. Then, the steam expansion drives the generator to generate electricity, realizing the efficient conversion of waste heat into electrical energy, making full use of waste gas waste heat resources, reducing energy waste, and lowering production energy consumption.

[0037] 6. By connecting the storage battery to the generator, the electrical energy generated by the generator can be stored in a timely manner to avoid energy waste. With the help of components such as pumps and condensers, the working medium can be recycled within the device. The condenser condenses the steam after passing through the generator into liquid, and the pump then delivers the liquid working medium to the evaporator, reducing the cost of working medium consumption and improving the economy and sustainability of the device operation.

[0038] 7. The cooling system and control unit are designed to monitor the generator temperature in real time and automatically control the supply of cooling medium or stop the supply based on the temperature, preventing the generator from overheating and causing performance degradation, shortened lifespan or even damage, and ensuring the safe and stable operation of the waste heat power generation unit. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0040] Figure 2 This is a partial three-dimensional structural schematic diagram of the waste heat power generation unit of this utility model;

[0041] Figure 3 This is a three-dimensional structural diagram of the filter assembly of this utility model;

[0042] Figure 4 This is a partial three-dimensional structural diagram of the filter assembly of this utility model;

[0043] The attached figures are labeled as follows: 1. Sintering furnace body; 2. Furnace cavity; 3. Hot water tank; 31. Heat exchange tube; 4. Air inlet pipe; 5. Filter assembly; 51. Filter tube; 52. Filter element; 53. Drain plug; 54. Slot; 55. Snap-fit ​​part; 56. Air inlet channel; 57. Filter channel; 58. Air supply channel; 6. Sealing ring; 7. Waste heat power generation unit; 71. Evaporator; 72. Shell; 73. Generator; 74. Battery; 75. Condenser; 76. Pump; 77. Cooling system; 78. Control unit; 781. Temperature sensor; 782. Controller; 8. Fin. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0045] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0046] Example 1:

[0047] like Figure 1 , Figure 3 and Figure 4 As shown, this embodiment provides a waste heat recovery device for a sintering furnace, including:

[0048] The sintering furnace body 1 has a furnace cavity 2 inside;

[0049] A heat exchange tank 3 is installed at the top of the sintering furnace body 1. A heat exchange tube 31 is provided at the bottom of the heat exchange tank 3, and the heat exchange tube 31 passes through the furnace cavity 2.

[0050] Waste heat power generation unit 7 uses the heat from waste gas to generate electricity;

[0051] The air intake pipe 4 is connected at one end to the hot water exchange tank 3 and at the other end to the waste heat power generation unit 7;

[0052] Filter assembly 5 is installed inside intake pipe 4;

[0053] The filter component 5 includes:

[0054] The filter tube 51 is connected to the air inlet pipe 4 and the hot water exchange tank 3;

[0055] Filter element 52 is disposed inside filter tube 51;

[0056] Drain plug 53 is threaded to the inner wall of filter pipe 51;

[0057] The card slot 54 is provided on the filter element 52;

[0058] The snap-fit ​​part 55 is provided on the drain plug 53 and snaps into the slot 54.

[0059] In this technical solution, the heat exchange tube 31 in the hot water tank 3 runs through the furnace chamber 2, firstly using waste heat to heat the water in the tank, thus achieving heat energy conversion; then, with the help of the waste heat power generation unit 7, the waste heat of the exhaust gas after heat exchange is further utilized to convert heat energy into electrical energy, achieving multi-stage recovery of waste heat, improving energy utilization efficiency, and reducing energy waste. The filter assembly 5 in the air inlet pipe 4 filters the exhaust gas containing impurities entering from the furnace chamber 2. Impurities are intercepted by the filter element 52, and the locking structure between the drain plug 53 and the filter element 52 facilitates the installation, disassembly, and cleaning of the filter element 52, preventing impurities from entering subsequent waste heat power generation unit 7 and other equipment, protecting electrical components and equipment operation, and reducing the risk of equipment damage and maintenance costs caused by impurities. The various components (sintering furnace body 1, hot water tank 3, waste heat power generation unit 7, air inlet pipe 4, filter assembly 5, etc.) are interconnected and cooperate with each other. The structural design of the filter tube 51, filter element 52, drain plug 53, slot 54 and snap-fit ​​part 55 in the filter assembly 5 ensures smooth transmission of waste gas and smooth filtration process, while making the maintenance and operation of filter element 52 convenient, maintaining the long-term stable operation of the device, and adapting to the actual production needs of waste heat recovery in sintering furnace.

[0060] Working principle: The high-temperature waste gas (carrying residual heat and impurities) generated in the furnace chamber 2 of the sintering furnace body 1 first comes into contact with the heat exchange tube 31 that runs through the bottom of the heat exchange tank 3 and penetrates the furnace chamber 2. The heat exchange tank 3 stores water for heat exchange. The heat from the high-temperature waste gas is transferred to the water in the tank through the heat exchange tube 31, causing the water to absorb heat and rise in temperature, thus achieving the first stage of waste heat recovery (thermal energy → hot water thermal energy). After the initial heat exchange, the temperature of the waste gas decreases, but it still contains residual heat, which continues to be transferred to the waste heat power generation unit 7 through the intake pipe 4. After initial heat exchange in the heat exchange tank 3, the waste gas containing impurities flows through the filter tube 51 of the filter assembly 5 during transmission in the air inlet pipe 4. The impurities (dust, particulate matter, etc.) in the waste gas are intercepted by the filter element 52 and remain on the filter element 52, realizing the separation of impurities from waste gas. The purified waste gas continues to flow to the waste heat power generation unit 7. It enters the waste heat power generation unit 7 through the air inlet pipe 4, converting the remaining heat energy of the waste gas into electrical energy, completing the second stage of waste heat recovery and utilization, and realizing the cascade utilization of energy. When the filter element 52 needs cleaning or replacement, since the drain plug 53 is threadedly connected to the inner wall of the filter tube 51, and the snap-fit ​​part 55 on the drain plug 53 is engaged in the slot 54 of the filter element 52, the drain plug 53 can be unscrewed by rotating it, taking the filter element 52 out of the filter tube 51 along with it. After cleaning the filter element 52, the drain plug 53 (along with the filter element 52) ​​is screwed back into the inner wall of the filter tube 51 by thread, so that the snap-fit ​​part 55 is re-engaged into the slot 54, completing the installation and reset of the filter element 52, ensuring the continued effectiveness of subsequent filtration. The entire device achieves efficient recovery and utilization of waste heat from the sintering furnace through the synergistic work of the above-mentioned waste heat recovery and impurity filtration, while protecting the equipment from damage by impurities and improving the stability and economy of the device operation.

[0061] like Figure 3 As shown, in this embodiment, the optimized filter pipe 51 includes an air inlet channel 56, a filter channel 57, and an air supply channel 58. The air inlet channel 56 is connected to the hot water tank 3, and the air inlet channel 56 is connected to the filter channel 57. The filter element 52 is installed in the filter channel 57, and the air supply channel 58 is connected to the air inlet pipe 4.

[0062] In this technical solution, by clearly defining the functional channels for air intake, filtration, and air supply, the waste gas containing impurities from the hot water exchange tank 3 can flow along the predetermined path of "air intake → filtration → air supply," avoiding airflow turbulence and ensuring that all waste gas passes through the filter element 52. This improves the integrity of impurity filtration and prevents unfiltered waste gas from directly entering the subsequent waste heat power generation unit 7, protecting the equipment. Installing the filter element 52 within an independent filtration channel 57 allows for precise design and installation based on the spatial dimensions of the filtration channel 57, ensuring compatibility between the filter element 52 and the channel, maximizing filtration area utilization, improving filtration efficiency, and facilitating future maintenance and replacement of the filter element 52 within the filtration channel 57. Connecting each channel of the filter pipe 51 to the hot water exchange tank 3 and the air intake pipe 4 allows the filter assembly 5 to better integrate into the airflow transmission system of the entire waste heat recovery device, strengthening the synergy between the filter assembly 5, the hot water exchange tank 3, and the waste heat power generation unit 7, and ensuring a smooth connection between the waste heat recovery and impurity filtration processes.

[0063] Working principle: The exhaust gas from the sintering furnace chamber 2 first enters the heat exchange tank 3. After initial heat exchange, the exhaust gas enters the inlet channel 56 of the filter pipe 51 from the heat exchange tank 3. Since the inlet channel 56 is connected to the filter channel 57, the exhaust gas will naturally flow into the filter channel 57. The filter element 52 is installed inside the filter channel 57. When the exhaust gas flows in the filter channel 57, it must pass through the filter element 52. At this time, impurities (dust, particulate matter, etc.) in the exhaust gas are intercepted by the filter element 52, thus achieving impurity filtration. The exhaust gas purified by the filter element 52 flows from the filter channel 57 into the air supply channel 58. The air supply channel 58 is connected to the air inlet pipe 4, and the exhaust gas enters the air inlet pipe 4 through the air supply channel 58, and then is transported to the waste heat power generation unit 7 for subsequent waste heat power generation. The air intake channel 56 is responsible for receiving the waste gas input from the heat exchange tank 3. Utilizing the channel's guiding properties, it stably guides the waste gas into the filtration stage. The filtration channel 57 serves as the mounting carrier for the filter element 52, providing dedicated space for impurity filtration. The filter element 52's interception effect purifies the waste gas. The air supply channel 58 orderly transports the filtered clean waste gas to the air intake pipe 4, allowing the filtered waste gas to smoothly enter the waste heat power generation unit 7. The three channels work together to ensure the efficient operation of the "waste gas after heat exchange → filtration and purification → waste heat power generation" process, achieving both effective impurity filtration and ensuring the continuity and stability of waste heat recovery.

[0064] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the optimized filter element 52 is a circular mesh structure, which is disposed inside the filter channel 57, and the drain plug 53 is located at the end of the filter channel 57 and is threadedly connected to the inner wall of the filter channel 57.

[0065] In this technical solution, the filter element 52 is designed as a circular mesh structure and placed inside the filter channel 57. The circular structure can better fit the filter channel 57, allowing the exhaust gas to come into contact with the mesh filter element 52 from all directions when flowing within the filter channel 57. This increases the contact area between the exhaust gas and the filter element 52, improves the impurity interception efficiency, and allows dust, particulate matter, and other impurities in the exhaust gas to be more fully captured by the filter element 52, thus enhancing the purification capacity of the exhaust gas. The drain plug 53 is located at the end of the filter channel 57 and is threaded to the inner wall. When the impurities intercepted by the filter element 52 accumulate to a certain extent, and the filter element 52 needs to be cleaned or replaced, the drain plug 53 can be unscrewed by rotating it. Since the filter element 52 is inside the filter channel 57, it can be easily cleaned or replaced with a new filter element 52 as the drain plug 53 is removed. The operation is simple, reducing maintenance difficulty and cost, and ensuring the long-term stable operation of the filter assembly 5. The drain plug 53 is threaded to the inner wall of the filter channel 57. This connection method can better ensure the sealing of the end of the filter channel 57, prevent the exhaust gas from leaking during the filtration process, ensure that the exhaust gas flows along the path of "inlet channel 56 → filter channel 57 → supply channel 58", maintain the stability of the airflow inside the device, and also improve the overall structural stability of the filter assembly 5, making the filtration process reliable and continuous.

[0066] like Figure 1 and Figure 3 As shown, in this embodiment, in an optimized manner, both the filter element 52 and the drain plug 53 are provided with sealing rings 6 on their outer sides, and the sealing rings 6 are in contact with the inner diameter of the filter channel 57.

[0067] In this technical solution, a sealing ring 6 is provided on the outside of the filter element 52 and the drain plug 53, which contacts the inner diameter of the filter channel 57. This seal fills the gaps between the filter element 52, the drain plug 53, and the inner wall of the filter channel 57, preventing exhaust gas from leaking through these gaps when flowing within the filter channel 57. This ensures that all exhaust gas passes through the filter element 52, improving the filtration effect, and simultaneously preventing unfiltered exhaust gas from directly entering subsequent systems, thus protecting the equipment. The presence of the sealing ring 6 allows the filter element 52 and the drain plug 53 to fit more tightly against the inner wall of the filter channel 57. Under the pressure generated by the flow of exhaust gas, the filter element 52 and the drain plug 53 are less likely to shift or shake, ensuring the structural stability of the filter assembly 5 and maintaining the reliability of the filtration process. Good sealing reduces the erosion of the inner wall of the filter channel 57, the filter element 52, and the drain plug 53 by corrosive components in the exhaust gas (because leaked exhaust gas may come into contact with the non-filtering, non-connecting areas of these components, causing corrosion), delaying component aging, reducing equipment maintenance frequency, and extending the overall service life of the device.

[0068] Working principle: When exhaust gas enters the filter channel 57, as it passes through the circular mesh structure of the filter element 52, the sealing ring 6 on the outside of the filter element 52 comes into close contact with the inner diameter of the filter channel 57, blocking any gaps that may exist between the filter element 52 and the inner wall of the filter channel 57. Similarly, the sealing ring 6 on the outside of the drain plug 53 also contacts the inner diameter of the filter channel 57, sealing the gap at the end of the filter channel 57. In this way, the exhaust gas can only flow through the mesh of the filter element 52 within the filter channel 57, forcing it to undergo impurity filtration and preventing leakage from other gaps, thus ensuring the effectiveness of filtration and the directionality of exhaust gas transmission. During the filtration process, the sealing ring 6 ensures the airtightness of the filtration environment, effectively intercepting impurities on one side of the filter element 52. When maintenance is required, when the drain plug 53 is unscrewed, the sealing ring 6 moves along with the drain plug 53. Because the sealing ring 6 has a certain elasticity and adaptability, it will not damage the inner wall of the filter channel 57. When the drain plug 53 and filter element 52 are reinstalled, the sealing ring 6 fits against the inner diameter of the filter channel 57 again, quickly restoring the sealing state, so that the filter assembly 5 can work continuously and stably, without affecting the filtration effect, and simplifying the sealing restoration operation after maintenance.

[0069] Example 2:

[0070] This embodiment provides a waste heat recovery device for sintering furnaces, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0071] like Figure 1 and Figure 2 As shown, in this embodiment, the optimized waste heat power generation unit 7 includes:

[0072] Evaporator 71 is connected to intake pipe 4;

[0073] The cylinder 72 is connected to the evaporator 71;

[0074] Generator 73 is installed outside cylinder 72;

[0075] Battery 74 is connected to generator 73;

[0076] Condenser 75 is connected to generator 73;

[0077] Pump 76 is connected to condenser 75 at one end and evaporator 71 at the other end;

[0078] Cooling system 77 is located outside generator 73;

[0079] The control unit 78 is electrically connected to the cooling system 77 and the generator 73, respectively.

[0080] In this technical solution, the waste heat in the sintering furnace exhaust gas is converted into the internal energy of the working medium steam through the cooperation of components such as evaporator 71, cylinder 72, and generator 73. The steam expansion then drives generator 73 to generate electricity, achieving efficient conversion of waste heat into electrical energy, fully utilizing the waste heat resources, reducing energy waste, and lowering production energy consumption. A battery 74 connected to generator 73 allows for timely storage of the electrical energy generated by generator 73, preventing energy waste and ensuring a stable power supply for subsequent equipment, guaranteeing the continuity and stability of the power supply to the device. Components such as pump 76 and condenser 75 enable the recycling of the working medium within the device. Condenser 75 condenses the steam after passing through generator 73 into a liquid state, and pump 76 then transports the liquid working medium to evaporator 71, reducing the cost of working medium consumption and improving the economic efficiency and sustainability of the device operation. The cooling system 77 and control unit 78 are configured to monitor the temperature of the generator 73 in real time and automatically control the supply of cooling medium or stop the supply according to the temperature, so as to prevent the generator 73 from overheating, resulting in performance degradation, shortened life or even damage, and ensure the safe and stable operation of the waste heat power generation unit 7.

[0081] Working Principle: Waste gas containing residual heat, supplied from the intake pipe 4, enters the evaporator 71. The heat from the waste gas heats the working medium, causing it to absorb heat and evaporate into steam, thus recovering the waste heat and converting it into the internal energy of the steam. The generated steam enters the cylinder 72 from the evaporator 71, then drives the generator 73 located outside the cylinder 72. The steam expands and performs work within the generator 73, converting its internal energy into mechanical energy, which in turn drives the generator 73 to generate electricity, achieving the conversion of thermal energy into electrical energy. The electrical energy generated by the generator 73 is transmitted through a circuit to the battery 74, where it is stored for later use. After the steam has undergone work by the generator 73, its pressure and temperature decrease, and it then enters the condenser 75. In the condenser 75, the steam releases heat and is cooled and condensed into a liquid working medium. Pump 76 is connected to condenser 75 at one end and evaporator 71 at the other. After pump 76 starts, it transports the condensed liquid working medium in condenser 75 back to evaporator 71, allowing the working medium to re-enter the next round of evaporation, expansion, and power generation process, thus realizing the recycling of the working medium. Cooling system 77 is located outside generator 73, and control unit 78 is electrically connected to both cooling system 77 and generator 73. During generator 73 operation, control unit 78 monitors its temperature in real time. When the temperature of generator 73 exceeds a set threshold, control unit 78 controls cooling system 77 to start, supplying cooling medium to generator 73 to remove the heat generated by generator 73 and cool it down. When the temperature of generator 73 drops to the normal range, control unit 78 controls cooling system 77 to stop supplying cooling medium. In this way, generator 73 is always operated within a suitable temperature range, ensuring the stable operation of waste heat power generation unit 7.

[0082] like Figure 1 As shown, in this embodiment, the optimized control unit 78 includes a temperature sensor 781 and a controller 782. The temperature sensor 781 detects the temperature of the generator 73; the controller 782 compares the temperature value detected by the temperature sensor 781 with a preset value, and controls the operating state of the cooling system 77 according to the comparison result.

[0083] In this technical solution, the temperature sensor 781 accurately detects the temperature of the generator 73 in real time, and the controller 782 compares the detected value with a preset value to achieve precise monitoring and control of the generator 73 temperature. This ensures that the generator 73 always operates within a suitable temperature range, avoiding the impact of excessively high or low temperatures on power generation efficiency and equipment lifespan. Utilizing the automated logic of the control unit 78, the operating status of the cooling system 77 can be automatically controlled based on changes in the generator 73 temperature without frequent manual intervention, reducing manual operation costs and error risks, and improving the intelligence and stability of the waste heat power generation unit 7. Controlling the cooling system 77 based on temperature comparison results ensures the safe operation of the generator 73 while avoiding unnecessary continuous operation of the cooling system 77, reducing energy consumption, achieving the dual goals of equipment protection and energy saving, and improving the overall economy and reliability of the waste heat recovery device.

[0084] Working Principle: Temperature sensor 781 is installed on generator 73 and continuously monitors the temperature of generator 73 in real time during operation. It converts the detected temperature information into electrical or digital signals and transmits them to controller 782 in real time as data. Upon receiving the temperature data from temperature sensor 781, controller 782 immediately compares the temperature value with preset temperature thresholds (including upper and lower limits). These preset values ​​are determined based on the performance parameters, operating requirements, and safety standards of generator 73 and define the normal operating temperature range of generator 73. When controller 782 finds that the temperature value detected by temperature sensor 781 is higher than the preset upper limit, it indicates that generator 73 is overheating, which may affect its performance and lifespan. At this time, controller 782 issues a start command to activate cooling system 77, supplying cooling medium (such as coolant or cooling air) to generator 73 to cool it down. When the temperature value detected by temperature sensor 781 is lower than the preset lower limit, it indicates that the generator 73 temperature is too low, which may affect power generation efficiency or cause equipment failure. Controller 782, depending on the actual situation, may control the cooling system 77 to stop operating or adjust the cooling intensity to maintain the generator 73 at a suitable temperature. If the temperature value is within the preset normal range, controller 782 maintains the current operating state of cooling system 77, ensuring that generator 73 continues to operate in a stable temperature environment. Temperature sensor 781 continuously monitors the temperature of generator 73, and controller 782 continuously receives new temperature data and performs comparative analysis. Based on the comparison results, it dynamically adjusts the operating state of cooling system 77, forming a closed-loop automatic control process. This achieves continuous and precise control of the generator 73 temperature, ensuring the safe and efficient operation of the waste heat power generation unit 7.

[0085] Example 3:

[0086] This embodiment provides a waste heat recovery device for sintering furnaces, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0087] like Figure 2 As shown, in this embodiment, the optimized cylinder 72 is provided with fins 8, and the fins 8 become narrower along the direction of the condenser 75.

[0088] In this technical solution, fins 8 are installed inside the cylinder 72, gradually narrowing along the direction of the condenser 75. By changing the cross-sectional area of ​​the steam flow, the flow velocity of the steam gradually increases during the expansion process, allowing the internal energy of the steam to be more fully converted into mechanical energy, improving the driving efficiency of the generator 73, and thus improving the overall efficiency of waste heat power generation. The fin structure of fin 8 increases the contact area between the steam and the cylinder 72, while the gradually changing width design allows the heat exchange intensity of the steam at different locations to better match its energy state. The fins 8 are wider near the evaporator 71, which can fully absorb the heat of the steam in the initial stage; the fins 8 narrow towards the condenser 75 to adapt to the trend of steam energy decay, ensuring that the heat exchange process in the entire cylinder 72 is uniform and efficient. The gradually changing layout of the fins 8 along the direction of the condenser 75 forms a flow guiding structure, guiding the steam to flow orderly towards the condenser 75, avoiding airflow turbulence or eddy current loss, reducing energy loss, and ensuring that the steam enters the condenser 75 smoothly, maintaining the stability of the working medium circulation.

[0089] Working Principle: High-temperature, high-pressure steam entering the cylinder 72 from the evaporator 71 first contacts the wider area of ​​the fins 8. At this point, the fin spacing of fins 8 is large, the steam flow cross-sectional area is large, and the pressure is relatively high. As the steam flows along the condenser 75, the width of the fins 8 gradually narrows, the flow cross-sectional area decreases, and the steam is forced to expand rapidly. In this process, the steam pressure energy is converted into kinetic energy, driving the fins 8 and the generator 73 connected to the cylinder 72 to operate, realizing the conversion of internal energy into mechanical energy, driving the generator 73 to generate electricity. The gradually changing width design of the fins 8 forms a structure similar to a scaling nozzle. The steam is guided by the fins 8 as it flows, and the flow velocity increases along the path. At the same time, in the wider area of ​​the fins 8, the steam temperature is high and the energy is sufficient. The wide fins 8 provide enough heat exchange surface to absorb heat and transfer it to the generator 73 drive components. Towards the condenser 75, the fins 8 narrow, the steam temperature decreases, and the energy decreases. The narrow fins 8 adapt to the heat exchange requirements at this time, avoiding excessive heat exchange that would cause the steam to condense prematurely, ensuring that the steam continues to expand and do work within the cylinder 72. After the steam expands and performs work in the fin area, its pressure and temperature decrease, and it smoothly enters the condenser 75 under the guidance of the fins 8. Because the gradually changing width design of the fins 8 optimizes the steam flow state, the steam flow rate entering the condenser 75 is stable and evenly distributed, facilitating the efficient conversion of the steam into a liquid working medium by the condenser 75. The steam is then pumped back to the evaporator 71 via the pump 76, completing the recycling of the working medium. Throughout the process, the gradually changing structure of the fins 8 dynamically adjusts the steam flow cross-section and heat exchange intensity, achieving the step-by-step release and efficient conversion of energy, ensuring the stable operation of the waste heat power generation unit 7.

[0090] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A waste heat recovery device for a sintering furnace, characterized in that, include: The sintering furnace body (1) has a furnace cavity (2) inside it; A heat exchange tank (3) is located on the top of the sintering furnace body (1). A heat exchange tube (31) is provided at the bottom of the heat exchange tank (3), and the heat exchange tube (31) passes through the furnace cavity (2). Waste heat power generation unit (7) uses the heat of waste gas to generate electricity; The air intake pipe (4) is connected at one end to the hot water exchange tank (3) and at the other end to the waste heat power generation unit (7); A filter assembly (5) is disposed within the air intake pipe (4); The filter component (5) includes: The filter tube (51) is connected to the air inlet pipe (4) and the hot water tank (3); A filter element (52) is disposed inside the filter tube (51); The drain plug (53) is threaded to the inner wall of the filter tube (51); A slot (54) is provided on the filter element (52); A snap-fit ​​part (55) is provided on the drain plug (53), and the snap-fit ​​part (55) snaps into the slot (54).

2. The sintering furnace waste heat recovery device according to claim 1, characterized in that, The filter tube (51) includes an air inlet channel (56), a filter channel (57) and an air supply channel (58). The air inlet channel (56) is connected to the hot water tank (3). The air inlet channel (56) is connected to the filter channel (57). The filter element (52) is installed in the filter channel (57). The air supply channel (58) is connected to the air inlet pipe (4).

3. The sintering furnace waste heat recovery device according to claim 2, characterized in that, The filter element (52) is a circular mesh structure and is disposed inside the filter channel (57). The drain plug (53) is located at the end of the filter channel (57) and is threadedly connected to the inner wall of the filter channel (57).

4. The sintering furnace waste heat recovery device according to claim 3, characterized in that, Both the filter element (52) and the drain plug (53) are provided with sealing rings (6) on their outer sides, and the sealing rings (6) are in contact with the inner diameter of the filter channel (57).

5. The sintering furnace waste heat recovery device according to claim 1, characterized in that, The waste heat power generation unit (7) includes: Evaporator (71) is connected to intake pipe (4); The cylinder (72) is connected to the evaporator (71); A generator (73) is disposed outside the cylinder (72); A storage battery (74) is connected to the generator (73); The condenser (75) is connected to the generator (73); Pump (76), one end is connected to condenser (75), and the other end is connected to evaporator (71); The cooling system (77) is located outside the generator (73); The control unit (78) is electrically connected to the cooling system (77) and the generator (73), respectively.

6. The sintering furnace waste heat recovery device according to claim 5, characterized in that, The control unit (78) includes a temperature sensor (781) and a controller (782). The temperature sensor (781) detects the temperature of the generator (73). The controller (782) compares the temperature value detected by the temperature sensor (781) with a preset value and controls the operating status of the cooling system (77) according to the comparison result.

7. The sintering furnace waste heat recovery device according to claim 5, characterized in that, The cylinder (72) is provided with fins (8), and the fins (8) become narrower along the direction of the condenser (75).

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