Waste heat utilization device

Abstract

The utility model relates to a waste heat utilization device which comprises a heat pipe type heat exchanger, a melting furnace tail gas conveying pipe is arranged on the heat pipe type heat exchanger, a first temperature sensor, a mixer and a second temperature sensor are arranged on the melting furnace tail gas conveying pipe, and the mixer comprises a mixer tank body, a gas guide bent pipe, a gas guide cone and a mixing blade. An air conveying pipe is arranged on the air guide bent pipe, a fan and a first adjusting valve are arranged on the air conveying pipe, a circulating hot water conveying pipe is arranged on the heat pipe type heat exchanger, a spiral finned tube is arranged on the circulating hot water conveying pipe, a rolling liquid buffer tank is arranged on the outer side of the spiral finned tube, and a circulating hot water return pipe is arranged between the spiral finned tube and the heat pipe type heat exchanger. And a circulating water buffer tank, a first booster pump and a second regulating valve are arranged on the circulating hot water return pipe. The temperature parameter of tail gas discharged outwards by the melting furnace can be reasonably reduced, and the requirement of a universal heat pipe type heat exchanger for the temperature range of a heat source medium is met. And the device is convenient to adjust and use, and has a wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of waste heat utilization equipment, in particular to a waste heat utilization device. Background Art

[0002] The main process of aluminum alloy ingot production technology: sorting waste aluminum materials, washing and dust removal; adding raw materials of various compositions into the melting furnace according to different product requirements, heating them at high temperature to melt them into aluminum liquid, transferring the melted aluminum liquid into the alloy furnace, adding alloy elements into the alloy furnace, removing slag and degassing the aluminum liquid, and casting the refined aluminum liquid into aluminum alloy ingots after the composition, slag content, gas content and physical properties are tested. During hot rolling of aluminum and its alloys, due to the high rolling temperature, an emulsion with both lubrication and cooling functions must be used as a process lubricant, which is commonly known as rolling fluid. With the increase of emulsion concentration, the amount of oil attached to the surface of the roll and the rolled piece increases, so that the friction coefficient and rolling pressure during rolling show a downward trend. The determination of the use temperature of the emulsion mainly considers two factors, the first is to inhibit the growth of microorganisms, and the second is to meet the requirements of its cooling performance. It is generally believed that the most suitable temperature for microbial growth is 30°C, and the microorganisms are gradually killed as the temperature rises. Although the higher the emulsion temperature, the fewer microorganisms there are in the emulsion, too high a temperature will affect its cooling capacity. Through a lot of practice, the use temperature of the emulsion is controlled at 50℃ to 60℃.

[0003] Heat pipe heat exchangers are a more preferred heat exchange equipment in the metallurgical industry due to their high heat transfer efficiency, compact structure, and advantages in controlling dew point corrosion. They are widely used in metallurgy, chemical industry, oil refining, boilers, ceramics, transportation, textiles, machinery, electronics and other industries. The working principle of the heat pipe heat exchanger is as follows: the working fluid in the evaporation section of the heat pipe will boil or evaporate after being heated, absorb heat from the external heat source, generate latent heat of vaporization, and change from liquid to steam. The generated steam flows to the condensation section under the action of a certain pressure difference in the tube. The steam encounters the cold wall and the external cold source, condenses into liquid, releases latent heat of vaporization, and is transferred to the external cold source through the tube wall. The condensate flows back to the evaporation section under the action of gravity and evaporates again. This reciprocating process realizes the heat transfer and exchange of the external hot and cold media. The melting furnace will release a large amount of exhaust gas during operation, and the temperature of the exhaust gas is relatively high and contains a large amount of heat energy. Before the exhaust gas is subjected to dust removal and exhaust gas treatment in sequence, the exhaust gas needs to be cooled down to meet the temperature requirements of the exhaust gas entering the dust collector. During the cooling process of the exhaust gas, a large amount of heat will be released to the outside. The emulsion required for the aluminum ingots formed by the aluminum produced by the melting furnace during the rolling process needs to be heated to a preset temperature to meet the requirements of the aluminum ingot rolling process. The exhaust gas releases heat energy to the cold source medium through the heat exchanger. It is a more feasible solution to continuously heat or keep the emulsion warm by using the heated cold source medium to achieve the rational use of heat energy; however, due to the different media used in the heat pipe, the heat pipe heat exchanger includes a heat pipe, and the heat exchange medium filled in the heat pipe of the general heat pipe heat exchanger is usually water as the medium for cost considerations. If there is no special requirement, the temperature of the exhaust gas from the melting furnace is relatively high, which exceeds the temperature range required by the heat pipe heat exchanger for the heat source medium; so that when using the general heat pipe heat exchanger to accept the heat source medium, the heat exchange medium is not heated up. Therefore, the temperature of the heat source medium received by the heat source channel entering the universal heat pipe heat exchanger is reasonably optimized, so as to meet the requirements of the universal heat pipe heat exchanger on the temperature range of the heat source medium, thereby improving the durability of the universal heat pipe heat exchanger, so that the overall emulsion process of heating rolled aluminum by releasing the heat energy contained in the exhaust gas from the melting furnace can be stably and continuously operated, reducing the maintenance process caused by the failure of the universal heat pipe heat exchanger, thereby improving the production efficiency of the enterprise. There is room for optimization, thereby increasing market promotion. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a waste heat utilization device which can reasonably reduce the temperature parameters of the exhaust gas discharged from the melting furnace to the outside, thereby meeting the temperature range requirements of the heat source medium of the general heat pipe heat exchanger, and is used to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is: a waste heat utilization device, including a heat pipe heat exchanger, wherein a melting furnace tail gas delivery pipe is arranged on the inlet end of the heat source channel of the heat pipe heat exchanger, and the melting furnace tail gas delivery pipe is sequentially provided with a first temperature sensor, a mixer and a second temperature sensor in a direction from close to the heat pipe heat exchanger to far away from the heat pipe heat exchanger, and the mixer comprises a mixer tank body and an air guide bend pipe, an air guide cone and a mixing blade sequentially arranged in the mixer tank body along the inlet end of the mixer tank body to the outlet end of the mixer tank body, and the inlet end of the air guide bend pipe is provided with a gas guide cone and a mixing blade. An air delivery pipe is arranged on the outlet end, a fan and a first regulating valve are arranged on the air delivery pipe, an inlet end of a circulating hot water delivery pipe is arranged on the outlet end of the heat source channel of the heat pipe heat exchanger, an inlet end of a spiral finned tube is arranged on the outlet end of the circulating hot water delivery pipe, a rolling liquid buffer tank is arranged on the outside of the spiral finned tube, a circulating hot water return pipe is arranged between the outlet end of the spiral finned tube and the inlet end of the heat source channel of the heat pipe heat exchanger, and a circulating water buffer tank, a first booster pump and a second regulating valve are arranged in sequence on the circulating hot water return pipe along the direction from the spiral finned tube to the heat pipe heat exchanger.

[0006] Preferably, the circulating water buffer tank and the rolling liquid buffer tank are respectively provided with an exhaust valve, a liquid level sensor and a stirring device, and the stirring device includes a stirring shaft, stirring blades arranged on the stirring shaft and a driving motor connected to the stirring shaft.

[0007] Preferably, the circulating hot water delivery pipe is sequentially provided with a filtering device, a third temperature sensor, a first stop valve and a fourth temperature sensor along the direction from the heat pipe heat exchanger to the spiral finned tube, the circulating hot water delivery pipe between the third temperature sensor and the first stop valve and the circulating hot water delivery pipe between the first stop valve and the fourth temperature sensor are connected through a cooling branch pipe, an air-cooled heat exchanger is provided on the cooling branch pipe, and second stop valves are respectively provided on the cooling branches on both sides of the air-cooled heat exchanger.

[0008] Preferably, the filtering device comprises a filter tube and a third stop valve, a first pressure sensor, a filter, a second pressure sensor and a third regulating valve which are sequentially arranged on the filter tube along the direction from the inlet end to the outlet end of the filter tube; the number of the filtering devices is two, the filter tubes between the filters and the second pressure sensors in the two filtering devices are connected through a recoil delivery pipe, a fourth regulating valve is arranged on the recoil delivery pipe, the filter tubes between the third stop valve and the first pressure sensor in each of the filtering devices are respectively provided with the inlet end of the recoil discharge branch pipe, and each recoil discharge branch pipe is respectively provided with a fourth stop valve.

[0009] Preferably, the number of the recoil discharge branch pipes is two, a recoil discharge main pipe is provided on the outlet ends of the two recoil discharge branch pipes, and an online turbidity meter is provided on the recoil discharge main pipe.

[0010] Preferably, the circulating water buffer tank is connected to a circulating liquid source delivery pipe, and a fifth regulating valve is provided on the circulating liquid source delivery pipe.

[0011] Preferably, the rolling liquid buffer tank is provided with a rolling liquid input pipe and a rolling liquid output pipe, and the rolling liquid input pipe and the rolling liquid output pipe are respectively provided with a sixth regulating valve, a second boosting pump and a first liquid flow sensor, and a fifth temperature sensor is provided on the circulating hot water return pipe between the circulating water buffer tank and the spiral fin tube.

[0012] The beneficial effects of the utility model are as follows: firstly, the utility model realizes the rational use of the exhaust gas discharged from the melting furnace and the air transported through the air transport pipe as a cold source to directly mix with the exhaust gas discharged from the melting furnace, thereby reducing the temperature parameters of the exhaust gas discharged from the melting furnace and thus meeting the temperature range requirements of the heat source medium of the universal heat pipe heat exchanger, thereby reducing the technical problem of easy damage of the universal heat pipe heat exchanger caused by the over-temperature of the medium transported by the heat source channel of the universal heat pipe heat exchanger.

[0013] Secondly, the circulating hot water delivery pipe described in the utility model is provided with a filter device, a third temperature sensor, a first stop valve and a fourth temperature sensor in sequence along the direction from the heat pipe heat exchanger to the spiral finned tube; the third temperature sensor and the fourth temperature sensor are both for the convenience of feedback of temperature parameters.

[0014] Finally, the circulating water buffer tank and the rolling liquid buffer tank described in the utility model are respectively provided with an exhaust valve, a liquid level sensor and a stirring device, and the installation of the liquid level sensor facilitates the feedback of liquid level parameters.

[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.

[0018] Figure 3 for Figure 2 A partial enlarged schematic diagram of detail B. DETAILED DESCRIPTION

[0019] like Figures 1 to 3As shown, a waste heat utilization device includes a heat pipe heat exchanger 1, a melting furnace tail gas conveying pipe 2 is arranged on the inlet end of the heat source channel of the heat pipe heat exchanger 1, and the melting furnace tail gas conveying pipe 2 is provided with a first temperature sensor 3, a mixer and a second temperature sensor 4 in sequence along the direction from close to the heat pipe heat exchanger 1 to far away from the heat pipe heat exchanger 1. The mixer includes a mixer tank body 5 and an air guide bend 6, an air guide cone 7 and a mixing blade 8 arranged in sequence from the inlet end of the mixer tank body 5 to the outlet end of the mixer tank body 5 in the mixer tank body 5. More preferably, the air guide bend 6 adopts an L-shaped bend structure, and the whole or part of the air guide cone 7 adopts a conical structure. The central axis of the air guide cone 7, the central axis of one end of the air guide bend 6 on the inner side of the mixer tank body 5 and the central axis of the mixer tank body 5 are located on the same axis. The number of mixing blades 8 is several, and the several mixing blades 8 are evenly distributed in a star shape on the outside of the central axis of the mixer tank body 5; an air delivery pipe 9 is arranged on the inlet end of the air guide elbow 6, and a fan 10 and a first regulating valve 11 are arranged on the air delivery pipe 9; the inlet end of the circulating hot water delivery pipe 12 is arranged on the outlet end of the heat source channel of the heat pipe heat exchanger 1, and the inlet end of the spiral finned tube 13 is arranged on the outlet end of the circulating hot water delivery pipe 12; a rolling liquid buffer tank 14 is arranged on the outside of the spiral finned tube 13; a circulating hot water return pipe 15 is arranged between the outlet end of the spiral finned tube 13 and the inlet end of the heat source channel of the heat pipe heat exchanger 1; the circulating hot water return pipe 15 is sequentially provided with a circulating water buffer tank 16, a first booster pump 17, a second liquid flow sensor 50 and a second regulating valve 18 along the direction from the spiral finned tube 13 to the heat pipe heat exchanger 1.

[0020] The circulating water buffer tank 16 and the rolling liquid buffer tank 14 are respectively provided with an exhaust valve 19, a liquid level sensor 20 and a stirring device, and the stirring device includes a stirring shaft 21, a stirring blade 22 arranged on the stirring shaft 21 and a driving motor 23 connected to the stirring shaft 21; installing the stirring device facilitates continuous stirring of the medium entering the circulating water buffer tank 16 or the rolling liquid buffer tank 14, so that the medium entering the circulating water buffer tank 16 or the rolling liquid buffer tank 14 is quickly mixed with the medium temporarily stored in the circulating water buffer tank 16 or the rolling liquid buffer tank 14, so that the temperature distribution of the medium in the circulating water buffer tank 16 or the rolling liquid buffer tank 14 is more uniform compared to no stirring.

[0021] During the operation stage of the aluminum ingot rolling process, the emulsion needs to be continuously input into the rolling liquid buffer tank 14, and after the heat exchange process is completed in the rolling liquid buffer tank 14, it is transported out of the rolling liquid buffer tank 14. Due to the large temperature difference between the unheated emulsion and the heated emulsion, the heat released to the emulsion per unit time during the operation stage of the aluminum ingot rolling process is relatively large, thereby meeting the temperature requirement for transporting the emulsion out of the rolling liquid buffer tank 14; and during the intermittent stop stage of the aluminum ingot rolling process, it is only necessary to maintain the temperature of the emulsion temporarily stored in the rolling liquid buffer tank 14 from decreasing, thereby meeting the demand for the emulsion temporarily stored in the rolling liquid buffer tank 14 per unit time during the intermittent stop stage of the aluminum ingot rolling process. The heat is relatively small. In view of the above situation, the circulating hot water delivery pipe 12 described in this product is provided with a filtering device, a third temperature sensor 24, a first stop valve 25 and a fourth temperature sensor 26 in sequence along the direction from the heat pipe heat exchanger 1 to the spiral finned tube 13. The circulating hot water delivery pipe 12 between the third temperature sensor 24 and the first stop valve 25 and the circulating hot water delivery pipe 12 between the first stop valve 25 and the fourth temperature sensor 26 are connected through a cooling branch pipe 27. An air-cooled heat exchanger 28 is provided on the cooling branch pipe 27. Second stop valves 29 are respectively provided on the cooling branches 27 on both sides of the air-cooled heat exchanger 28. Two second stop valves 29 are used. Therefore, during the operation stage of the aluminum ingot rolling process, the first stop valve 25 is opened and the two second stop valves 29 are closed so that the cold source medium after heat exchange in the heat pipe heat exchanger 1 is continuously transported to the spiral finned tube 13 through the first stop valve 25 to complete the heating of the emulsion in the rolling liquid buffer tank 14; during the intermittent stop stage of the aluminum ingot rolling process, the first stop valve 25 is closed and the two second stop valves 29 are opened so that the cold source medium after heat exchange in the heat pipe heat exchanger 1 is transported to the emulsion in the rolling liquid buffer tank 14 after heat exchange through the heat source channel of the air-cooled heat exchanger 28 and the atmosphere near the air-cooled heat exchanger 28 to achieve the insulation of the emulsion in the rolling liquid buffer tank 14.

[0022] Since the cold source medium continuously passing through the heat pipe heat exchanger 1 is continuously heated, part of the cold source medium will evaporate and the inorganic salt contained in the cold source medium will precipitate. Therefore, the filtering device described in this product includes a filter tube 30 and a third stop valve 31, a first pressure sensor 32, a filter 33, a second pressure sensor 34 and a third regulating valve 35 arranged in sequence on the filter tube 30 along the inlet end of the filter tube 30 to the outlet end of the filter tube 30; the number of the filtering devices is two, and the two filtering devices are connected in parallel to each other. The two filtering devices connected in parallel are installed to meet the continuous filtering of the cold source medium, and the filtering device described in this product includes a first pressure sensor 32 and a second pressure sensor The sensor 34 is convenient for judging the flow resistance of the filter 33 in the filter device in use by using the parameters fed back by the first pressure sensor 32 and the second pressure sensor 34, so as to prompt the staff to switch between the filter device in standby state and the filter device in use state; the filter pipe 30 between the filter 33 and the second pressure sensor 34 in the two filter devices is connected through the backwash delivery pipe 36, and the backwash delivery pipe 36 is provided with a fourth regulating valve 37. The filter pipe 30 between the third stop valve 31 and the first pressure sensor 32 in each filter device is respectively provided with an inlet end of a backwash discharge branch pipe 38, and each backwash discharge branch pipe 38 is respectively provided with a fourth stop valve 39. The number of the backwash discharge branch pipes 38 is two, and the outlet ends of the two backwash discharge branch pipes 38 are provided with a backwash discharge main pipe 40, and the backwash discharge main pipe 40 is provided with an online turbidity meter 41. The installation of the online turbidity meter 41 is convenient for feedback of the turbidity parameters of the medium discharged through the backwash discharge main pipe 40.

[0023] The circulating water buffer tank 16 is connected with a circulating liquid source delivery pipe 42, and a fifth regulating valve 43 is arranged on the circulating liquid source delivery pipe 42; the circulating liquid source delivery pipe 42 is installed to facilitate the replenishment of circulating water as a cold source into the circulating water buffer tank 16. The rolling liquid buffer tank 14 is provided with a rolling liquid input pipe 44 and a rolling liquid output pipe 45, and the rolling liquid input pipe 44 and the rolling liquid output pipe 45 are respectively provided with a sixth regulating valve 46, a second boosting pump 47 and a first liquid flow sensor 48, and a fifth temperature sensor 49 is arranged on the circulating hot water return pipe 15 between the circulating water buffer tank 16 and the spiral fin tube 13. The rolling liquid inlet pipe 44 is installed to facilitate the emulsion to enter the rolling liquid buffer tank 14, and the rolling liquid outlet pipe 45 is installed to facilitate the emulsion in the rolling liquid buffer tank 14 to be transported outward; the second booster pump 47 installed on the rolling liquid inlet pipe 44 and the rolling liquid outlet pipe 45 respectively provides the conveying power of the emulsion and adjusts the emulsion delivery amount by adjusting the opening of the sixth regulating valve 46; the first liquid flow sensor 48 is installed to facilitate the feedback of flow parameters.

[0024] The usage of this product is as follows: Figures 1 to 3 As shown, the following steps are included:

[0025] S1, the tail gas conveying pipe 2 of the melting furnace receives the tail gas discharged from the melting furnace and enters the inner cavity of the mixer tank 5 from the inlet end of the mixer tank 5 after the temperature is fed back by the second temperature sensor 4. At the same time, the fan 10 is turned on, and the outside atmosphere enters the air conveying pipe 9 after being driven by the fan 10 and is conveyed to the inner cavity of the mixer tank 5 through the air guide elbow 6. The air conveyed by the air guide elbow 6 is used as a cold source and mixed with the tail gas entering the inner cavity of the mixer tank 5. The air is fully mixed under the comprehensive action of the air guide cone 7 and the mixing blade 8 to obtain the cooled tail gas, and then discharged from the outlet end of the mixer tank 5 and continued to be conveyed to the heat source channel of the heat pipe heat exchanger 1 along the tail gas conveying pipe 2 of the melting furnace and the medium continuously conveyed to the cold source channel of the heat pipe heat exchanger 1 for countercurrent heat exchange, and finally discharged from the heat source channel of the heat pipe heat exchanger 1 to the downstream tail gas treatment device for the next step of treatment.

[0026] S2. The circulating water temporarily stored in the circulating water buffer tank 16 is driven by the first booster pump 17 to be continuously transported to the cold source channel of the heat pipe heat exchanger 1 and to perform countercurrent heat exchange with the medium continuously transported to the cold source channel of the heat pipe heat exchanger 1. When the circulating water is discharged from the outlet end of the cold source channel of the heat pipe heat exchanger 1, heated circulating water is formed and transported to the circulating hot water transport pipe 12. The heated circulating water is filtered of mechanical impurities by the filtering device in working state on the circulating hot water transport pipe 12 and then transported to the inner cavity of the spiral fin tube 13 and the emulsion in the rolling liquid buffer tank 14. After completing the heat exchange, it is returned to the circulating water buffer tank 16 through the circulating hot water return pipe 15 to form a circulation.

[0027] S3. During the operation stage of the aluminum ingot rolling process, the first stop valve 25 remains in an open state, and the two second stop valves 29 remain in a closed state. The heated circulating water is filtered of mechanical impurities by the filtering device in working state on the circulating hot water delivery pipe 12, and then directly sent into the inner cavity of the spiral fin tube 13 and then returned to the circulating water buffer tank 16. At the same time, the rolling liquid inlet pipe 44 continuously transports the emulsion into the inner cavity of the rolling liquid buffer tank 14, and is driven by the stirring device on the rolling liquid buffer tank 14 to be fully mixed with the emulsion temporarily stored in the rolling liquid buffer tank 14 and continuously indirectly exchange heat with the heated circulating water continuously transported to the spiral finned tube 13, and finally transported to the target user from the rolling liquid output pipe 45; in this process, it is necessary to adjust the flow rate of the emulsion transported through the rolling liquid inlet pipe 44 in combination with the temperature feedback from the fifth temperature sensor 49 and the liquid level parameter feedback from the liquid level sensor 20 installed on the rolling liquid buffer tank 14, and the flow rate parameter of the emulsion transported by the rolling liquid inlet pipe 44 is fed back through the first liquid flow sensor 48 installed on the rolling liquid inlet pipe 44, so that the temperature parameter of the emulsion transported through the rolling liquid output pipe 45 is always within an appropriate range, and according to the amount of emulsion required by the process, the rolling liquid output pipe 45 should also be further adjusted and fed back through the first liquid flow sensor 48 installed on the rolling liquid output pipe 45.

[0028] During the intermittent stop stage of the aluminum ingot rolling process, the first stop valve 25 is kept closed, and the two second stop valves 29 are kept open. The heated circulating water is filtered for mechanical impurities by the filtering device in working state on the circulating hot water delivery pipe 12, and then fed back the temperature parameters by the third temperature sensor 24. It is sent to the cooling branch pipe 27, cooled by the air-cooled heat exchanger 28, and then fed back the temperature by the fourth temperature sensor 26. It is sent to the inner cavity of the spiral fin tube 13 and the emulsion in the rolling liquid buffer tank 14 to complete indirect heat exchange and then sent back to the circulating water buffer tank 16. Further adjustment is required during the use. The opening degree of the third regulating valve 35 of the filtering device in the use state makes the parameters fed back by the fourth temperature sensor 26 able to meet the temperature parameter range of the heat source supplied to the spiral finned tube 13 in this stage; in this process, the rolling liquid inlet pipe 44 no longer supplies emulsion to the rolling liquid buffer tank 14 and the rolling liquid output pipe 45 no longer outputs emulsion to the outside, and the heat source supplied to the spiral finned tube 13 only needs to meet the requirement that the emulsion in the rolling liquid buffer tank 14 is always within the usable temperature range, and the staff can indirectly judge the temperature parameters of the emulsion in the rolling liquid buffer tank 14 through the parameters fed back by the fifth temperature sensor 49.

[0029] In addition, when the difference between the feedback parameters of the first pressure sensor 32 and the second pressure sensor 34 in the filter device in use reaches a preset range, it is necessary to complete the state switching between the filter device in use and the filter device in standby state, which specifically includes the following steps:

[0030] The third stop valve 31 and the third regulating valve 35 on the filter device in the standby state are opened, and the third stop valve 31 and the third regulating valve 35 on the filter device in the use state are closed.

[0031] After the above process is completed, the filter device originally in the standby state is now converted into a filter device in the use state, and the filter device originally in the use state is now converted into a filter device in the state to be recoiled. The filter device in the state to be recoiled needs further processing to meet the demand for reuse, which specifically includes the following steps:

[0032] Open the fourth regulating valve 37. At this time, the circulating water filtered by the filter 33 in the filter device in use is divided into two parts. The first part of the circulating water is delivered to the spiral fin tube 13 to keep the emulsion in the rolling liquid buffer tank 14 heated and then sent back to the circulating water buffer tank 16 to form a cycle; and the second part of the circulating water is reversely delivered from the backwash delivery pipe 36 to the filter 33 of the filter device in the state of waiting for backwashing, so as to reversely flush out the analyzed impurities adsorbed in the filter 33 of the filter device in the state of waiting for backwashing and continuously deliver it to the backwash discharge main pipe 40 through the backwash discharge branch pipe 38 connected to the filter device in the state of waiting for backwashing. The backwash medium discharged outward through the backwash discharge main pipe 40 continuously feeds back the turbidity parameters through the online turbidity meter 41 until the parameters fed back by the online turbidity meter 41 reach the preset range, and then the fourth regulating valve 37 is closed. At this time, the filter device originally in the state of waiting for backwashing is converted into a filter device in the standby state again. In this process, the external drainage volume required for backwashing is supplemented by the circulating liquid source delivery pipe 42, so that the liquid level in the circulating water buffer tank 16 is always within the preset liquid level height.

[0033] Through this embodiment, it is achieved that the exhaust gas discharged from the melting furnace is reasonably utilized and the air transported through the air transport pipe 9 is directly mixed with the exhaust gas discharged from the melting furnace as a cold source, thereby reducing the temperature parameters of the exhaust gas discharged from the melting furnace and satisfying the temperature range requirements of the heat source medium of the universal heat pipe heat exchanger, thereby reducing the technical problem of easy damage of the universal heat pipe heat exchanger caused by overheating of the medium transported by the heat source channel of the universal heat pipe heat exchanger.

[0034] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A waste heat utilization device, characterized in that: The invention comprises a heat pipe heat exchanger (1), wherein a melting furnace tail gas conveying pipe (2) is arranged at the inlet end of the heat source channel of the heat pipe heat exchanger (1), and a first temperature sensor (3), a mixer, and a second temperature sensor (4) are arranged in sequence on the melting furnace tail gas conveying pipe (2) along a direction from close to the heat pipe heat exchanger (1) to far away from the heat pipe heat exchanger (1). The mixer comprises a mixer tank body (5) and an air guide bend (6), an air guide cone (7), and a mixing blade (8) are arranged in sequence in the mixer tank body (5) along the inlet end of the mixer tank body (5) to the outlet end of the mixer tank body (5). An air conveying pipe (9) is arranged at the inlet end of the air guide bend (6). The air conveying pipe (9) A fan (10) and a first regulating valve (11) are arranged on the heat exchanger; the outlet end of the heat source channel of the heat pipe heat exchanger (1) is provided with the inlet end of a circulating hot water delivery pipe (12); the outlet end of the circulating hot water delivery pipe (12) is provided with the inlet end of a spiral finned tube (13); a rolling liquid buffer tank (14) is arranged outside the spiral finned tube (13); a circulating hot water return pipe (15) is arranged between the outlet end of the spiral finned tube (13) and the inlet end of the heat source channel of the heat pipe heat exchanger (1); and the circulating hot water return pipe (15) is provided with a circulating water buffer tank (16), a first booster pump (17) and a second regulating valve (18) in sequence along the direction from the spiral finned tube (13) to the heat pipe heat exchanger (1).

2. The waste heat utilization device according to claim 1, characterized in that: The circulating water buffer tank (16) and the rolling liquid buffer tank (14) are respectively provided with an exhaust valve (19), a liquid level sensor (20) and a stirring device, wherein the stirring device comprises a stirring shaft (21), a stirring blade (22) provided on the stirring shaft (21) and a driving motor (23) connected to the stirring shaft (21).

3. The waste heat utilization device according to claim 1, characterized in that: The circulating hot water delivery pipe (12) is provided with a filter device, a third temperature sensor (24), a first stop valve (25) and a fourth temperature sensor (26) in sequence along the direction from the heat pipe heat exchanger (1) to the spiral finned tube (13); the circulating hot water delivery pipe (12) between the third temperature sensor (24) and the first stop valve (25) and the circulating hot water delivery pipe (12) between the first stop valve (25) and the fourth temperature sensor (26) are connected via a cooling branch pipe (27); an air-cooled heat exchanger (28) is provided on the cooling branch pipe (27); and second stop valves (29) are provided on the cooling branches (27) on both sides of the air-cooled heat exchanger (28).

4. The waste heat utilization device according to claim 3, characterized in that: The filtering device comprises a filtering tube (30) and a third stop valve (31), a first pressure sensor (32), a filter (33), a second pressure sensor (34) and a third regulating valve (35) which are arranged on the filtering tube (30) in sequence from the inlet end of the filtering tube (30) to the outlet end of the filtering tube (30); the number of the filtering devices is two, the filtering tubes (30) between the filter (33) and the second pressure sensor (34) in the two filtering devices are connected via a backwashing delivery pipe (36), a fourth regulating valve (37) is arranged on the backwashing delivery pipe (36), the filtering tube (30) between the third stop valve (31) and the first pressure sensor (32) in each filtering device is respectively provided with an inlet end of a backwashing discharge branch pipe (38), and each backwashing discharge branch pipe (38) is respectively provided with a fourth stop valve (39).

5. The waste heat utilization device according to claim 4, characterized in that: The number of the backwash discharge branch pipes (38) is two, and a backwash discharge main pipe (40) is provided on the outlet ends of the two backwash discharge branch pipes (38), and an online turbidity meter (41) is provided on the backwash discharge main pipe (40).

6. The waste heat utilization device according to claim 1, characterized in that: The circulating water buffer tank (16) is connected to a circulating liquid source delivery pipe (42), and a fifth regulating valve (43) is provided on the circulating liquid source delivery pipe (42).

7. The waste heat utilization device according to claim 1, characterized in that: The rolling liquid buffer tank (14) is provided with a rolling liquid input pipe (44) and a rolling liquid output pipe (45), and the rolling liquid input pipe (44) and the rolling liquid output pipe (45) are respectively provided with a sixth regulating valve (46), a second boosting pump (47) and a first liquid flow sensor (48), and the circulating hot water return pipe (15) between the circulating water buffer tank (16) and the spiral finned tube (13) is provided with a fifth temperature sensor (49).

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