Waste heat recovery device and dust removal equipment for steel mill

Abstract

The utility model provides a waste heat recovery device and dust removal equipment for a steel mill, and relates to the technical field of dust removal, the waste heat recovery device comprises a first water box, a second water box, a hollow box, inner pipes, outer pipes, a cold water chamber and a hot water chamber, the first water box and the second water box are oppositely arranged, and the outer pipes are communicated with the first water box and the second water box; the inner pipe penetrates through the outer pipe, the first water box and the second water box, the two ends of the outer pipe are communicated with the two hollow boxes respectively, an air inlet is formed in the hollow box close to the second water box, an air outlet is formed in the hollow box close to the first water box, the cold water chamber is communicated with the first water box, the hot water chamber is communicated with the second water box, and cold water is contained in the cold water chamber. Cold water and high-temperature gas are subjected to heat exchange, heat in the high-temperature gas exhausted by dust removal equipment is recycled, the temperature of the high-temperature gas is reduced, heat pollution is avoided, heated hot water is stored in the hot water chamber, the heat is stored for subsequent use, and heat waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal, and particularly to a waste heat recovery device and a dust removal device for steel mills. Background Art

[0002] During the production process of steel mills, boilers will generate a large amount of gas with pollutants such as soot. For environmental protection reasons, the pollutants in the gas need to be filtered before being discharged into the air. In the prior art, dust collectors are often used to treat pollutants. There are water tanks and spraying devices in the dust collectors. The gas with pollutants is poured into the water tank, and the water in the water tank can adsorb pollutants, and the sprayed water can also adsorb pollutants. The gas treated by the dust collector still contains a large amount of heat. If it is directly discharged into the air, it will not only cause waste of heat, but also may cause thermal pollution to the environment. Content of the Utility Model

[0003] The problem to be solved by the utility model is how to recover the heat in the high-temperature gas discharged from the dust collector.

[0004] To this end, the utility model provides a waste heat recovery device, which is applied to a dust removal device for steel mills, and includes a first water box, a second water box, a hollow box, a plurality of inner pipes, a plurality of outer pipes, a cold water chamber and a hot water chamber. The first water box and the second water box are arranged oppositely. Two hollow boxes are respectively arranged on the opposite sides of the first water box and the second water box. The two ends of each outer pipe are respectively communicated with the first water box and the second water box. Each inner pipe passes through the corresponding outer pipe, the first water box and the second water box, and the two ends of the inner pipe are respectively communicated with the two hollow boxes. An air inlet hole is opened on the hollow box close to the second water box, and an air outlet hole is opened on the hollow box close to the first water box. The cold water chamber is communicated with the first water box, and the hot water chamber is communicated with the second water box. Cold water is used to be contained in the cold water chamber.

[0005] Optionally, the waste heat recovery device further includes a water tank, a partition plate, a water inlet pipe and a water outlet pipe. The partition plate divides the water tank into two parts, namely the cold water chamber and the hot water chamber. The two ends of the water inlet pipe are respectively communicated with the cold water chamber and the first water box. An inlet valve is opened on the cold water chamber. The two ends of the water outlet pipe are respectively communicated with the hot water chamber and the second water box. An outlet valve is opened on the hot water chamber.

[0006] Optionally, a heat preservation layer is provided on the inner wall of the hot water chamber.

[0007] Optionally, a water level sensor is provided on the upper part of the side wall of the hot water chamber.

[0008] Optionally, a water pump is provided in the cold water chamber. The water pump is communicated with the water inlet pipe, and a one-way valve is provided on the water inlet pipe.

[0009] Optionally, a solenoid valve is provided on the water outlet pipe, a temperature sensor is provided on the second water box, and the temperature sensor is electrically connected to the solenoid valve.

[0010] Optionally, a waste heat box is further included, and the first water box, the second water box, the inner pipe, the outer pipe, and the hollow box are all arranged in the waste heat box.

[0011] Optionally, a water pressure sensor is provided on the first water box.

[0012] Compared with the prior art, the beneficial effects of the waste heat recovery device of the present utility model are as follows:

[0013] In the present utility model, by providing a first water box and a second water box, the opposite surfaces of the first water box and the second water box are connected through a plurality of outer pipes. The first water box is connected to the cold water chamber, and the second water box is connected to the hot water chamber. The cold water in the cold water chamber flows along the first water box, a plurality of outer pipes, and the second water box to the hot water chamber. Two hollow boxes are respectively arranged on the opposite side surfaces of the first water box and the second water box, and the two hollow boxes are connected through an inner pipe. The number of inner pipes is the same as that of the outer pipes. Each inner pipe passes through the corresponding outer pipe, and both ends of the plurality of inner pipes respectively pass through the first water box and the second water box and are connected to the two hollow boxes. Specifically, connection holes for the inner pipes to pass through are provided on both the first water box and the second water box. Both ends of the inner pipe pass through the connection holes to penetrate the first water box and the second water box and are respectively connected to the two hollow boxes. It should be noted that the connection between the inner pipe and the connection hole is sealed. An air inlet hole is provided on the hollow box on the side of the second water box, and the air inlet hole is connected to the dust removal device. An air outlet hole is provided on the hollow box on the side of the first water box. The high-temperature gas discharged from the dust removal device enters the hollow box on the side of the second water box through the air inlet hole, then passes through the inner pipe and the hollow box on the side of the first water box, and is discharged from the air outlet hole. During the process of gas flow, the cold water simultaneously flows along the first water box, a plurality of outer pipes, and the second water box to the hot water chamber. The flowing direction of the cold water is opposite to the flowing direction of the high-temperature gas. The cold water and the high-temperature gas exchange heat. After the high-temperature gas is cooled, it is discharged from the air outlet hole. After the temperature of the cold water rises, it enters the hot water chamber for storage. The present utility model recovers the heat in the high-temperature gas discharged from the dust removal device by exchanging heat between the cold water and the high-temperature gas, reduces the temperature of the high-temperature gas, avoids thermal pollution, stores the heated hot water in the hot water chamber, stores the heat for subsequent use, and avoids heat waste.

[0014] In addition, to solve the above problems, the present utility model also provides a dust removal device for a steel mill, including the above-mentioned waste heat recovery device.

[0015] Compared with the prior art, the beneficial effects of the dust removal device for a steel mill of the present utility model are substantially the same as those of the above-mentioned waste heat recovery device, and will not be elaborated herein.

[0016] Optionally, the dust removal equipment for steel mills further includes a dust collector, a mounting frame, and an exhaust duct. The two ends of the exhaust duct are respectively communicated with the dust collector and the air inlet hole of the waste heat recovery device. The mounting frame is connected to the dust collector, and the waste heat recovery device is arranged on the mounting frame. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the waste heat recovery device described in the embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the outer pipe and the inner pipe described in the embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the dust removal equipment for steel mills described in the embodiment of the present invention.

[0020] Description of the Reference Numerals:

[0021] 1 - Dust collector; 2 - Exhaust duct; 3 - Waste heat recovery device; 301 - Waste heat box; 302 - Connecting pipe; 303 - Hollow box; 304 - Second water box; 305 - Temperature sensor; 306 - Outer pipe; 307 - First water box; 308 - Water pressure sensor; 309 - Water tank; 3091 - Cold water chamber; 3092 - Hot water chamber; 310 - Water pump; 311 - Water inlet pipe; 312 - Check valve; 313 - Water outlet pipe; 314 - Solenoid valve; 315 - Partition board; 316 - Thermal insulation layer; 317 - Water level sensor; 318 - Water outlet valve; 319 - Inner pipe; 4 - Mounting frame. Detailed Embodiments

[0022] In order to make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the drawings.

[0023] It should be noted that in the description of the present invention, the orientation or positional relationships indicated by "upper", "lower", "left", "right", "top", "bottom", "front", "rear", "inner", and "outer" are based on the orientation or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and does not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0024] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0025] Moreover, although the present utility model has been described with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present utility model. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not depart from the spirit and scope of the present utility model defined by the appended claims. It should be understood that different dependent claims and features in this document can be combined in ways other than those described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other embodiments.

[0026] To solve the above problems, as Figure 1 and Figure 2 shown, the present utility model provides a waste heat recovery device, which is applied to the dust removal equipment of a steel plant, and includes a first water box 307, a second water box 304, a hollow box 303, a plurality of inner tubes 319, a plurality of outer tubes 306, a cold water chamber 3091 and a hot water chamber 3092. The first water box 307 and the second water box 304 are arranged opposite to each other. Two of the hollow boxes 303 are respectively arranged on the opposite sides of the first water box 307 and the second water box 304. The two ends of each outer tube 306 are respectively communicated with the first water box 307 and the second water box 304. Each inner tube 319 passes through the corresponding outer tube 306, the first water box 307 and the second water box 304, and the two ends of the inner tube 319 are respectively communicated with the two hollow boxes 303. An air inlet hole is formed in the hollow box 303 close to the second water box 304, and an air outlet hole is formed in the hollow box 303 close to the first water box 307. The cold water chamber 3091 is communicated with the first water box 307, the hot water chamber 3092 is communicated with the second water box 304, and cold water is used to be contained in the cold water chamber 3091.

[0027] In this embodiment, by providing the first water box 307 and the second water box 304, the opposite surfaces of the first water box 307 and the second water box 304 are connected by a plurality of outer tubes 306. The first water box 307 is connected to the cold water chamber 3091, and the second water box 304 is connected to the hot water chamber 3092. The cold water in the cold water chamber 3091 flows along the first water box 307, the plurality of outer tubes 306, and the second water box 304 to the hot water chamber 3092. The two hollow boxes 303 are respectively provided on the opposite side surfaces of the first water box 307 and the second water box 304. The two hollow boxes 303 are connected by an inner tube 319. The number of the inner tubes 319 is the same as that of the outer tubes 306. Each inner tube 319 passes through the corresponding outer tube 306, and both ends of the plurality of inner tubes 319 respectively pass through the first water box 307 and the second water box 304 and are connected to the two hollow boxes 303. Specifically, the first water box 307 and the second water box 304 are both provided with connection holes for the inner tubes 319 to pass through. Both ends of the inner tube 319 pass through the connection holes to penetrate the first water box 307 and the second water box 304 and are respectively connected to the two hollow boxes 303. It should be noted that the connection between the inner tube 319 and the connection hole is sealed. An air inlet hole is provided on the hollow box 303 on the side of the second water box 304, and the air inlet hole is connected to the dust removal device. An air outlet hole is provided on the hollow box 303 on the side of the first water box 307. The high-temperature gas discharged from the dust removal device enters the hollow box 303 on the side of the second water box 304 through the air inlet hole, then passes through the inner tube 319 and the hollow box 303 on the side of the first water box 307, and is discharged from the air outlet hole. During the flow of the gas, the cold water simultaneously flows along the first water box 307, the plurality of outer tubes 306, and the second water box 304 to the hot water chamber 3092. The flow direction of the cold water is opposite to the flow direction of the high-temperature gas. The cold water and the high-temperature gas exchange heat. After the high-temperature gas is cooled, it is discharged from the air outlet hole. After the temperature of the cold water rises, it enters the hot water chamber 3092 for storage. The utility model exchanges heat between the cold water and the high-temperature gas, recovers the heat in the high-temperature gas discharged from the dust removal device, reduces the temperature of the high-temperature gas, avoids thermal pollution, stores the heated hot water in the hot water chamber 3092, stores the heat for subsequent use, and avoids heat waste.

[0028] Specifically, the plurality of outer tubes 306 are evenly arranged on the surface of the opposite sides of the first water box 307 and the second water box 304. The two hollow boxes 303 are respectively provided on the opposite side surfaces of the first water box 307 and the second water box 304 and are in contact with the first water box 307 and the second water box 304. Such an arrangement improves the contact area between the water flow and the air flow and improves the heat exchange efficiency. The lower end of the first water box 307 is connected to the cold water chamber 3091, and the lower end of the second water box 304 is connected to the hot water chamber 3092, which is convenient for the extraction and flow of the cold water.

[0029] Optionally, as Figure 1As shown, the waste heat recovery device further includes a water tank 309, a partition plate 315, a water inlet pipe 311 and a water outlet pipe 313. The partition plate 315 divides the water tank 309 into two parts, namely the cold water chamber 3091 and the hot water chamber 3092. The two ends of the water inlet pipe 311 are respectively communicated with the cold water chamber 3091 and the first water box 307. An inlet valve is provided on the cold water chamber 3091. The two ends of the water outlet pipe 313 are respectively communicated with the hot water chamber 3092 and the second water box 304. An outlet valve 318 is provided on the hot water chamber 3092.

[0030] In this embodiment, by providing the water tank 309 and arranging the partition plate 315 in the water tank 309, the partition plate 315 divides the water tank 309 into two parts, namely the cold water chamber 3091 and the hot water chamber 3092. The cold water chamber 3091 is communicated with the first water box 307 through the water inlet pipe 311, and the hot water chamber 3092 is communicated with the second water box 304 through the water outlet pipe 313. The cold water chamber 3091 and the hot water chamber 3092 are integrated in one water tank 309, saving installation space. An inlet valve is also provided on the cold water chamber 3091 for supplementing cold water, and an outlet valve 318 is provided on the hot water chamber 3092 for discharging hot water when hot water is needed.

[0031] Specifically, the partition plate 315 can be arranged in the horizontal plane, dividing the water tank 309 into two upper and lower spaces. The upper part is the cold water chamber 3091, and the lower part is the hot water chamber 3092. The water outlet pipe 313 can pass through the cold water chamber 3091 and the partition plate 315 to communicate the hot water chamber 3092 and the second water box 304.

[0032] Optionally, as Figure 1 shown, a heat preservation layer 316 is provided on the inner wall of the hot water chamber 3092.

[0033] In this embodiment, by providing the heat preservation layer 316 on the inner side wall of the hot water chamber 3092, the hot water in the hot water chamber 3092 is thermally insulated, reducing heat loss and improving the heat recovery rate.

[0034] Optionally, as Figure 1 shown, a water level sensor 317 is provided on the upper part of the side wall of the hot water chamber 3092.

[0035] In this embodiment, by providing the water level sensor 317 at the upper end of the side wall of the hot water chamber 3092, when the water level sensor 317 detects that the water level in the hot water chamber 3092 is too high, the outlet valve 318 on the hot water chamber 3092 opens to discharge the hot water into the subsequent equipment, making room for new hot water.

[0036] Optionally, as Figure 1As shown, a water pump 310 is provided in the cold water chamber 3091. The water pump 310 is communicated with the water inlet pipe 311, and a check valve 312 is provided on the water inlet pipe 311.

[0037] In this embodiment, by providing the water pump 310 in the cold water chamber 3091, the water pump 310 can extract the cold water in the cold water chamber 3091 into the water inlet pipe 311 to provide power for the water flow, and a check valve 312 is provided in the water inlet pipe 311 to make the water flow only from the cold water tank 309 to the first water box 307, preventing the cold water from flowing back and affecting the heat exchange effect.

[0038] Optionally, as Figure 1 shown, a solenoid valve 314 is provided on the water outlet pipe 313, a temperature sensor 305 is provided on the second water box 304, and the temperature sensor 305 is electrically connected to the solenoid valve 314.

[0039] In this embodiment, by providing the temperature sensor 305 on the second water box 304 and the solenoid valve 314 on the water outlet pipe 313, when the water flows into the second water box 304, the temperature sensor 305 can detect the temperature change and send a signal to the solenoid valve 314. The solenoid valve 314 opens to conduct the water outlet pipe 313. When there is no water flow through the second water box 304, the solenoid valve 314 closes to prevent the hot water and hot air in the hot water chamber 3092 from flowing back due to reasons such as thermal expansion of cold water, resulting in heat loss.

[0040] Optionally, as Figure 1 shown, a waste heat box 301 is further included. The first water box 307, the second water box 304, the inner pipe 319, the outer pipe 306, and the hollow box 303 are all provided in the waste heat box 301.

[0041] In this embodiment, by integrally providing the first water box 307, the second water box 304, the inner pipe 319, the outer pipe 306, and the hollow box 303 in the waste heat box 301, space is saved. When installing the waste heat recovery device on the dust removal equipment, only the waste heat box 301 needs to be installed, simplifying the installation steps.

[0042] Optionally, as Figure 1 shown, a water pressure sensor 308 is provided on the first water box 307.

[0043] In this embodiment, by providing the water pressure sensor 308 in the first water box 307, the water pressure in the first water box 307 can be detected. When the water pressure is too high, the water pump 310 can be controlled to reduce the pumping speed to prevent damage to the device caused by excessive water pressure. When the water pressure is relatively low, the water pump 310 can be controlled to increase the pumping speed to improve the heat exchange effect.

[0044] As Figure 3As shown in the figure, a dust removal device for a steel mill according to another embodiment of the present utility model includes the above-mentioned waste heat recovery device.

[0045] Compared with the prior art, the beneficial effects of the dust removal device for a steel mill in this embodiment are substantially the same as those of the above-mentioned waste heat recovery device, and will not be elaborated here.

[0046] Optionally, the dust removal device for a steel mill further includes a dust collector 1, a mounting frame 4 and an exhaust duct 2. The two ends of the exhaust duct 2 are respectively communicated with the dust collector 1 and the air inlet hole of the waste heat recovery device 3. The mounting frame 4 is connected to the dust collector 1, and the waste heat recovery device 3 is arranged on the mounting frame 4.

[0047] Specifically, a connecting pipe 302 is further arranged in the waste heat box 301. One end of the connecting pipe 302 is communicated with the air inlet hole, and the other end is communicated with the exhaust duct 2.

[0048] In this embodiment, a mounting frame 4 is arranged on the dust collector 1, which is convenient for the installation of the waste heat recovery device 3. A exhaust duct 2 is also arranged on the dust collector 1. The gas with heat flows through the exhaust duct 2 to be communicated with the air inlet hole and flows into the hollow box 303.

[0049] Specifically, a high-pressure centrifugal fan is used in the dust collector 1. With the suction of the high-pressure centrifugal fan, the gas containing pollutants is pressed into the water tank. The high-pressure centrifugal fan has a large air volume and high dust removal efficiency.

[0050] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. A waste heat recovery device, applied to dust removal equipment in steel plants, characterized in that: The invention comprises a first water box (307), a second water box (304), a hollow box (303), a plurality of inner tubes (319), a plurality of outer tubes (306), a cold water chamber (3091) and a hot water chamber (3092), wherein the first water box (307) and the second water box (304) are arranged opposite to each other, the two hollow boxes (303) are arranged on opposite sides of the first water box (307) and the second water box (304), the two ends of each outer tube (306) are respectively connected to the first water box (307) and the second water box (304), and each inner tube (319) is arranged at The corresponding outer tube (306), the first water box (307) and the second water box (304), and the two ends of the inner tube (319) are respectively connected to the two hollow boxes (303), the hollow box (303) close to the second water box (304) is provided with an air inlet hole, and the hollow box (303) close to the first water box (307) is provided with an air outlet hole, the cold water chamber (3091) is connected to the first water box (307), and the hot water chamber (3092) is connected to the second water box (304), and the cold water chamber (3091) is used to hold cold water.

2. The waste heat recovery device according to claim 1, characterized in that: The water tank (309) further comprises a water tank (309), a partition plate (315), a water inlet pipe (311) and a water outlet pipe (313); the partition plate (315) divides the water tank (309) into the cold water chamber (3091) and the hot water chamber (3092); two ends of the water inlet pipe (311) are respectively connected to the cold water chamber (3091) and the first water box (307); a water inlet valve is provided on the cold water chamber (3091); two ends of the water outlet pipe (313) are respectively connected to the hot water chamber (3092) and the second water box (304); a water outlet valve (318) is provided on the hot water chamber (3092).

3. The waste heat recovery device according to claim 1, characterized in that: The inner wall of the hot water chamber (3092) is provided with a heat-insulating layer (316).

4. The waste heat recovery device according to claim 1, characterized in that: A water level sensor (317) is provided on the upper portion of the side wall of the hot water chamber (3092).

5. The waste heat recovery device according to claim 2, characterized in that: A water pump (310) is provided in the cold water chamber (3091), the water pump (310) is connected to the water inlet pipe (311), and a one-way valve (312) is provided on the water inlet pipe (311).

6. The waste heat recovery device according to claim 2, characterized in that: The water outlet pipe (313) is provided with a solenoid valve (314), the second water box (304) is provided with a temperature sensor (305), and the temperature sensor (305) is electrically connected to the solenoid valve (314).

7. The waste heat recovery device according to claim 1, characterized in that: It also includes a waste heat box (301), wherein the first water box (307), the second water box (304), the inner tube (319), the outer tube (306) and the hollow box (303) are all arranged in the waste heat box (301).

8. The waste heat recovery device according to claim 1, characterized in that: The first water box (307) is provided with a water pressure sensor (308).

9. A dust removal device for a steel plant, characterized in that: It comprises a waste heat recovery device as described in any one of claims 1 to 8.

10. The dust removal device according to claim 9, characterized in that: It also comprises a dust collector (1), a mounting frame (4) and an exhaust pipe (2), wherein the two ends of the exhaust pipe (2) are respectively connected to the air inlet holes of the dust collector (1) and the waste heat recovery device (3), the mounting frame (4) is connected to the dust collector (1), and the waste heat recovery device (3) is arranged on the mounting frame (4).

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