Waste gas treatment heat recovery device

Abstract

The embodiment of the utility model provides a waste gas treatment heat recovery device, and belongs to the technical field of waste gas treatment. The waste gas treatment heat recovery device comprises a waste gas treatment unit and a heat recovery unit, the waste gas treatment unit comprises a cracking incinerator, a gas conveying pipe and a waste gas treatment device, the gas conveying pipe is communicated with the cracking incinerator and used for discharging waste gas generated by the cracking incinerator, and the other end of the gas conveying pipe is communicated with the waste gas treatment device. The heat recovery unit comprises a water tank, a heat exchange pipe set and a pump. The heat exchange pipe set is arranged on the outer wall of the gas conveying pipe and makes contact with the gas conveying pipe. The heat exchange pipe set is of a spiral structure, a channel is defined by the middle of the heat exchange pipe set, the air conveying pipe is sleeved with the heat exchange pipe set through the channel, the heat exchange pipe set is provided with a water inlet and a water outlet, the pump is communicated with the water inlet of the heat exchange pipe so as to be used for pumping water in the water tank to the heat exchange pipe set, and the water outlet of the heat exchange pipe set is communicated with the water tank. The waste gas treatment heat recovery device can recycle heat energy, and heat waste is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a waste gas treatment heat recovery device. Background Art

[0002] In the prior art, when treating domestic waste, the incineration method is generally used. The pyrolysis and incineration treatment of domestic waste generally involves sorting and screening the combustibles and sending them to the pyrolysis incinerator for pyrolysis. The pyrolysis products are directly treated by the flue gas purification device after incineration and then discharged into the air through the chimney. However, the flue gas discharged from the incinerator after the incineration method is a high-temperature gas, which will generate a large amount of waste heat. If there is no good way to collect the waste heat, it will cause heat dissipation and easily cause waste of resources. Utility Model Content

[0003] The embodiment of the present application provides a waste gas treatment heat recovery device, which can recycle the heat energy of the waste gas and avoid heat waste.

[0004] An embodiment of the present application provides a waste gas treatment heat recovery device, which includes a waste gas treatment unit and a heat recovery unit. The waste gas treatment unit includes a cracking incinerator, a gas pipeline and a waste gas treatment device. The gas pipeline is connected to the cracking incinerator. The gas pipeline is used to discharge the waste gas generated by the cracking incinerator. The other end of the gas pipeline is connected to the waste gas treatment device, and the waste gas treatment device is used to purify the waste gas. The heat recovery unit includes a water tank, a heat exchange tube group and a pump. The heat exchange tube group is arranged on the outer wall of the gas pipe and in contact with it. The heat exchange tube group is a spiral structure, and a channel is enclosed in the middle of the heat exchange tube group. The heat exchange tube group is sleeved on the gas pipe through the channel. The heat exchange tube group has a water inlet and a water outlet. The pump is connected to the water inlet of the heat exchange tube for extracting water in the water tank to the heat exchange tube group. The water outlet of the heat exchange tube group is connected to the water tank.

[0005] In the above technical solution, the pyrolysis incinerator incinerates and pyrolyzes domestic waste, and the gas pipeline discharges the waste gas in the incineration process in the pyrolysis incinerator. The temperature of the waste gas is relatively high, and the waste gas contains toxic components such as sulfur dioxide, nitride, chloride and dioxin. The waste gas is transmitted to the waste gas treatment device through the gas pipeline, and the waste gas is purified by the waste gas treatment device to reduce the harmful components in the waste gas, which is beneficial to subsequent discharge. By arranging a heat recovery unit on the gas pipeline, the heat recovery unit can cool down the temperature of the waste gas in the gas pipeline and recover the heat energy of the flue gas in the gas pipeline, thereby improving the recovery rate of heat energy and avoiding heat energy waste. Specifically, by adopting a spiral structure for the heat exchange tube group, the heat exchange tube group is arranged in a circle on the outside of the gas pipe. When the high-temperature exhaust gas in the gas pipe passes through, the heat of the high-temperature exhaust gas makes the temperature of the gas pipe high due to the contact between the heat exchange tube group and the outer wall of the gas pipe, and exchanges heat with the water in the heat exchange tube group, transferring the heat to the water in the heat exchange tube group. The heated water enters the water tank, and under the power of the pump, after one or more heat exchanges, the temperature of the hot water in the water tank can be used for people's daily life, thereby avoiding the waste of heat in the exhaust gas of the gas pipe.

[0006] In some embodiments, the heat exchange tube group includes a plurality of spiral tube segments connected end to end in sequence, the spiral tube segments have a heat exchange surface close to one side of the outer surface of the gas transmission pipe, and there is a gap between the heat exchange surfaces of two adjacent spiral tube segments.

[0007] In the above technical solution, by providing a gap between the heat exchange surfaces between two adjacent spiral tube sections, the processing of the heat exchange tube group is simpler.

[0008] In some embodiments, a heat transfer plate is provided between any two adjacent spiral pipe segments, and the heat transfer plate is used to close the gap between the two adjacent spiral pipe segments. Both sides of the heat transfer plate are fixedly connected to the two adjacent spiral pipe segments, and the bottom surface of the heat transfer plate contacts the outer surface of the gas transmission pipe.

[0009] In the above technical solution, a heat transfer plate is provided at the gap between the two spiral pipe sections. Compared with a gap between the two spiral pipe sections, the heat transfer plate can not only directly share the heat between the two spiral pipe sections through the heat transfer plate, but also the bottom surface of the heat transfer plate is in contact with the outer surface of the gas pipe, so that the heat of the gas pipe can be transferred to the two adjacent spiral pipe sections, thereby increasing the heat exchange area between the heat exchange tube group and the gas pipe, and achieving a better heat exchange effect.

[0010] In some embodiments, the cross-sectional shape of the spiral tube segment is an equilateral triangle, and the heat exchange surface is any surface of the spiral tube segment.

[0011] In the above technical solution, the cross-sectional shape of the spiral pipe section is an equilateral triangle, and the heat exchange surface is any surface of the spiral pipe section. Compared with the line contact mode of the heat exchange tube with a circular cross-sectional shape in the prior art, the contact between the spiral pipe section with a triangular cross-sectional shape and the gas pipe is a surface contact, so that the heat exchange area is larger and the heat transfer efficiency is higher. Moreover, under the condition of the same flow rate of the heat exchange tube group, the heat exchange efficiency between the water in the spiral pipe section with a triangular cross-sectional shape and the gas pipe is higher.

[0012] In some embodiments, the spiral pipe segment has two side walls facing away from the gas delivery pipe, and a heat insulation layer is arranged between the two side walls of two adjacent spiral pipe segments on the heat transfer plate.

[0013] In the above technical solution, a thermal insulation layer is arranged between the two side walls of two adjacent spiral pipe segments, and the thermal insulation layer is arranged on the heat transfer plate. The thermal insulation layer can not only insulate the heat transferred on the heat transfer plate, but also insulate the heat on the side walls of the spiral pipe segment, thereby reducing the heat loss rate of the heat exchange tube group and correspondingly improving the heat exchange efficiency.

[0014] In some embodiments, the top surface of the thermal insulation layer is flush with the top surface of the spiral pipe segment; or, it protrudes from the top surface of the spiral pipe segment.

[0015] In the above technical solution, since the cross-sectional shape of the spiral pipe segment is a triangle, the top surface of the spiral pipe segment is linear, and the heat dissipation area is relatively small. By making the outer side of the thermal insulation layer flush with the top surface of the spiral pipe segment, the side wall of the spiral pipe segment can be fully covered, and a good thermal insulation effect can still be achieved. Of course, by making the top surface of the thermal insulation layer protrude from the top surface of the spiral pipe segment, the thickness of the thermal insulation layer is thicker, the spiral pipe segment can be fully covered, and the thermal insulation performance is better.

[0016] In some embodiments, a plurality of ribs are provided on a side of the heat transfer plate facing away from the gas pipe, and two ends of the ribs are connected to the side wall between two adjacent spiral pipe sections.

[0017] In the above technical solution, a plurality of convex ribs are provided on the side of the heat transfer plate away from the gas pipe. The convex ribs can enhance the integrity of the connection between the heat transfer plate and the spiral pipe section. The convex ribs are provided on the outer surface of the heat transfer plate, so that the surface of the heat transfer plate is uneven, and the connection stability between the insulation layer and the heat transfer plate and the spiral pipe section can be enhanced. The convex ribs also increase the contact area between the heat transfer plate and two adjacent spiral pipe sections, so that the heat transfer effect is better.

[0018] In some embodiments, the water tank is connected to a water supply pipe and a drain pipe. The water supply pipe is used to replenish water to the water tank, and a first valve is provided on the water supply pipe; the drain pipe is provided with a second valve, and the drain pipe is used to discharge the hot water after heat exchange in the water tank to the hot water supply system.

[0019] In the above technical solution, when the water in the water tank meets people's usage requirements, the hot water after heat exchange in the water tank is discharged to the hot water supply system, and the amount of water in the water tank decreases. Therefore, water can be replenished to the water tank in time through the water supply pipe to meet the water supply and demand balance of the water tank.

[0020] In some embodiments, the heat recovery unit includes a temperature control monitoring component, which includes a liquid level sensor, a temperature sensor and a controller. The temperature sensor is arranged in the water tank to monitor the liquid level of the water tank. The temperature sensor is used to monitor the temperature in the water tank. The temperature sensor, the liquid level sensor, the first valve and the second valve are all electrically connected to the controller; when the water temperature in the water tank exceeds the first threshold value, the controller controls the second valve to open; when the water level in the water tank is lower than the first liquid level, the controller controls the second valve to close and controls the first valve to open to add water to the water tank; when the water in the water tank is added to the second liquid level, the controller controls the second valve to close.

[0021] In the above technical scheme, the water temperature in the water tank can be monitored in real time through the temperature sensor in the temperature control monitoring component. When the water temperature in the water tank reaches the first threshold value, the controller can control the second valve to open, so as to transfer a part of the hot water in the water tank to the hot water supply system for use; when a part of the hot water in the water tank is transferred and the water level in the water tank is lower than the first liquid level, the controller controls the second valve to close and then controls the first valve to open, and uses the water supply pipe to replenish water to the water tank until the water in the water tank reaches the second liquid level. The controller controls the first valve to close, and the water pump inputs the water in the water tank into the heat exchange pipe group and the exhaust gas in the gas pipe for heat exchange, and automatically controls the water output and water addition of the water tank without manual control. Hot water can be delivered to the hot water supply system more timely.

[0022] In some embodiments, the heat recovery unit includes a heat-insulating shell, which is sleeved on the outside of the heat exchange tube group.

[0023] In the above technical solution, the heat-insulating shell cover is arranged on the heat exchange tube group, which can play a protective role and reduce the waste of heat in the heat exchange tube group.

[0024] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1A schematic diagram of the structure of a waste gas treatment heat recovery device provided in some embodiments of the present application;

[0027] Figure 2 A schematic diagram of the structure of a gas pipeline and a heat recovery unit in an exhaust gas treatment heat recovery device provided in some embodiments of the present application;

[0028] Figure 3 for Figure 2 A schematic diagram of the structure of the heat exchange tube group in the heat recovery unit in the gas pipeline;

[0029] Figure 4 for Figure 3 A cross-sectional view of the middle heat exchange tube group on the gas transmission pipe;

[0030] Figure 5 for Figure 4 A is an enlarged schematic diagram.

[0031] Icons: pyrolysis incinerator 10, gas pipeline 20, exhaust gas treatment device 30, heat recovery unit 40, water tank 41, heat exchange tube group 42, spiral pipe section 420, heat exchange surface 421, side wall 422, heat transfer plate 423, rib 424, insulation layer 425, first valve 43, second valve 44, water supply pipe 45, drain pipe 46, insulation shell 47. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The units of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Example

[0038] The present application provides a waste gas treatment heat recovery device, see Figures 1 to 5 The waste gas treatment heat recovery device includes a waste gas treatment unit and a heat recovery unit 40. The waste gas treatment unit includes a cracking incinerator 10, a gas pipeline 20 and a waste gas treatment device 30. The gas pipeline 20 is connected to the cracking incinerator 10. The gas pipeline 20 is used to discharge the waste gas generated by the cracking incinerator 10. The other end of the gas pipeline 20 is connected to the waste gas treatment device 30. The waste gas treatment device 30 is used to purify the waste gas. The heat recovery unit 40 includes a water tank 41, The heat exchange tube group 42 and the pump (not shown in the figure) are arranged on the outer wall of the gas pipe 20 and in contact with it; the heat exchange tube group 42 is a spiral structure, and the middle part of the heat exchange tube group 42 is enclosed to form a channel. The heat exchange tube group 42 is sleeved on the gas pipe 20 through the channel. The heat exchange tube group 42 has a water inlet and a water outlet. The pump is connected to the water inlet of the heat exchange tube for pumping water in the water tank 41 to the heat exchange tube group 42, and the water outlet of the heat exchange tube group 42 is connected to the water tank 41.

[0039] The pyrolysis incinerator 10 incinerates and pyrolyzes domestic waste, and the gas pipe 20 discharges the waste gas in the incineration process in the pyrolysis incinerator 10. The temperature of the waste gas is relatively high, and the waste gas contains toxic components such as sulfur dioxide, nitrides, chlorides and dioxins. The waste gas is transmitted to the waste gas treatment device 30 through the gas pipe 20. The waste gas is purified by the waste gas treatment device 30 to reduce harmful components in the waste gas, which is beneficial for subsequent emissions. The waste gas treatment device 30 is a prior art and will not be described here. By providing a heat recovery unit 40 on the gas pipe 20, the heat recovery unit 40 can cool down the temperature of the waste gas in the gas pipe 20 and recover the heat energy of the flue gas in the gas pipe 20, thereby improving the recovery rate of heat energy and avoiding heat energy waste. Specifically, by adopting a spiral structure for the heat exchange tube group 42, the heat exchange tube group 42 is arranged in a surrounding manner on the outside of the gas pipe 20. When the high-temperature exhaust gas in the gas pipe 20 passes through, the heat of the high-temperature exhaust gas makes the temperature of the gas pipe 20 high due to the contact between the heat exchange tube group 42 and the outer wall of the gas pipe 20. The heat is exchanged with the water in the heat exchange tube group 42, and the heat is transferred to the water in the heat exchange tube group 42. The heated water enters the water tank 41, and under the power of the pump, after one or more heat exchanges, the temperature of the hot water in the water tank 41 can be used for people's daily life, thereby avoiding the waste of heat in the exhaust gas of the gas pipe 20.

[0040] In some embodiments, Figure 3 As shown, the heat exchange tube group 42 includes a plurality of spiral tube segments 420 connected end to end in sequence, the spiral tube segment 420 has a heat exchange surface 421 close to one side of the outer surface of the gas transmission pipe 20, and there is a gap between two adjacent spiral tube segments 420. By providing a gap between two adjacent spiral tube segments 420, the heat exchange tube group 42 is easier to process.

[0041] In some embodiments, Figure 5 As shown, a heat transfer sheet 423 is provided between any two adjacent spiral pipe sections 420. The heat transfer sheet 423 is used to close the gap between the two adjacent spiral pipe sections 420. The two sides of the heat transfer sheet 423 are respectively fixedly connected to the two adjacent spiral pipe sections 420, and the bottom surface of the heat transfer sheet 423 is in contact with the outer surface of the gas pipe 20. By providing the heat transfer sheet 423 at the gap between the two spiral pipe sections 420, compared with the gap between the two spiral pipe sections 420, the heat transfer sheet 423 can not only directly share the heat between the two spiral pipe sections 420 through the heat transfer sheet 423, but also the bottom surface of the heat transfer sheet 423 is in contact with the outer surface of the gas pipe 20, so that the heat of the gas pipe 20 can also be transferred to the two adjacent spiral pipe sections 420, thereby increasing the heat exchange surface 421 of the heat exchange tube group 42 and the gas pipe 20, and achieving a better heat exchange effect.

[0042] The cross-sectional shape of the spiral tube segment 420 may be circular, triangular, rectangular or the like.

[0043] In some embodiments, Figure 5 As shown, the cross-sectional shape of the spiral pipe segment 420 is an equilateral triangle, and the heat exchange surface 421 is any surface of the spiral pipe segment 420. By making the cross-sectional shape of the spiral pipe segment 420 an equilateral triangle, and the heat exchange surface 421 being any surface of the spiral pipe segment 420, compared with the line contact mode of the heat exchange tube in the prior art where the cross-sectional shape is a circle, the contact between the spiral pipe segment 420 with a triangular cross-sectional shape and the gas pipe 20 is a surface contact, so that the heat exchange surface 421 is larger and the heat transfer efficiency is higher. Moreover, under the condition of the same flow rate of the heat exchange tube group 42, the heat exchange efficiency between the water in the spiral pipe segment 420 with a triangular cross-sectional shape and the gas pipe 20 is higher.

[0044] In some embodiments, Figure 5 As shown, the spiral pipe section 420 has two side walls 422 away from the gas delivery pipe 20, and a heat insulation layer 425 is provided between the two side walls 422 of two adjacent spiral pipe sections 420 on the heat transfer sheet 423. The heat insulation layer 425 is provided between the two side walls 422 of two adjacent spiral pipe sections 420, and the heat insulation layer 425 is provided on the heat transfer sheet 423. The heat insulation layer 425 can not only keep the heat transferred on the heat transfer sheet 423, but also keep the heat on the side walls 422 of the spiral pipe section 420, thereby reducing the heat loss rate of the heat exchange tube group 42 and correspondingly improving the heat exchange efficiency.

[0045] The heat-insulating layer 425 may be an extruded polystyrene board, such as a foam board, which is easy to obtain and has low cost.

[0046] In some embodiments, Figure 5 As shown, the top surface of the thermal insulation layer 425 is flush with the top surface of the spiral tube segment 420; or, it protrudes from the top surface of the spiral tube segment 420. Since the cross-sectional shape of the spiral tube segment 420 is a triangle, the top surface of the spiral tube segment 420 is linear, and the heat dissipation area is relatively small. By making the outer side of the thermal insulation layer 425 flush with the top surface of the spiral tube segment 420, the side wall 422 of the spiral tube segment 420 can be fully covered, and a good thermal insulation effect can still be achieved. Of course, by protruding the top surface of the thermal insulation layer 425 from the top surface of the spiral tube segment 420, the thickness of the thermal insulation layer 425 is thicker, and the spiral tube segment 420 can be completely covered, and the thermal insulation performance is better.

[0047] In some embodiments, Figure 5As shown, a plurality of convex ribs 424 are provided on the side of the heat transfer sheet 423 away from the gas pipe 20, and both ends of the convex ribs 424 are connected to the side wall 422 between two adjacent spiral pipe sections 420. By providing a plurality of convex ribs 424 on the side of the heat transfer sheet 423 away from the gas pipe 20, the convex ribs 424 can enhance the connection integrity between the heat transfer sheet 423 and the spiral pipe section 420. The convex ribs 424 are provided on the outer surface of the heat transfer sheet 423, so that the surface of the heat transfer sheet 423 is uneven, and the connection stability between the heat insulation layer 425 and the heat transfer sheet 423 and the spiral pipe section 420 can be enhanced. In addition, the convex ribs 424 also increase the contact area between the heat transfer sheet 423 and the two adjacent spiral pipe sections 420, so that the heat transfer effect is better.

[0048] The rib 424 is integrally formed with the heat transfer sheet 423. In this embodiment, the cross-sectional shape of the rib 424 can be semicircular.

[0049] In some embodiments, Figure 2 As shown, the water tank 41 is connected with a water supply pipe 45 and a drainage pipe 46. The water supply pipe 45 is used to supply water to the water tank 41. The water supply pipe 45 is provided with a first valve 43. The drainage pipe 46 is provided with a second valve 44. The drainage pipe 46 is used to discharge the hot water after heat exchange in the water tank 41 to the hot water supply system. When the water in the water tank 41 meets the use requirements of people, after the hot water after heat exchange in the water tank 41 is discharged to the hot water supply system, the amount of water in the water tank 41 decreases. Therefore, the water tank 41 can be replenished with water in time through the water supply pipe 45 to meet the water supply and demand balance of the water tank 41.

[0050] In some embodiments, the heat recovery unit 40 includes a temperature control monitoring component, which includes a liquid level sensor, a temperature sensor and a controller. The temperature sensor is arranged in the water tank 41 to monitor the liquid level of the water tank 41. The temperature sensor is used to monitor the temperature in the water tank 41. The temperature sensor, the liquid level sensor, the first valve 43 and the second valve 44 are all electrically connected to the controller; when the water temperature in the water tank 41 exceeds the first threshold value, the controller controls the second valve 44 to open; when the water level in the water tank 41 is lower than the first liquid level, the controller controls the second valve 44 to close and controls the first valve 43 to open to replenish water into the water tank 41; when the water in the water tank 41 is replenished to the second liquid level, the controller controls the second valve 44 to close. The temperature sensor in the temperature control monitoring component can monitor the water temperature in the water tank 41 in real time. When the water temperature in the water tank 41 reaches a first threshold value, the controller can control the second valve 44 to open, thereby transferring a portion of the hot water in the water tank 41 to the hot water supply system for use; when a portion of the hot water in the water tank 41 is transferred and the water level in the water tank 41 is lower than the first liquid level, the controller controls the second valve 44 to close and then controls the first valve 43 to open, and uses the water supply pipe 45 to replenish water to the water tank 41 until the water in the water tank 41 reaches the second liquid level. The controller then controls the first valve 43 to close, and the water pump inputs the water in the water tank 41 into the heat exchange pipe group 42 for heat exchange with the exhaust gas in the gas pipe 20, and automatically controls the water output and water addition of the water tank 41 without the need for manual control, so that the hot water can be delivered to the hot water supply system more timely.

[0051] In some embodiments, the heat recovery unit 40 includes a heat-insulating shell 47, which is sleeved on the outside of the heat exchange tube group 42. The heat-insulating shell 47 is disposed on the heat exchange tube group 42 to protect the heat exchange tube group 42 and reduce the waste of heat in the heat exchange tube group 42.

[0052] In some embodiments, the waste gas treatment device is a prior art, and the waste gas treatment device is mainly used to purify the waste gas. For example, in this embodiment, the waste gas treatment device may include a flue gas quenching tower, a purification tank, a dust removal tower, a deacidification tower and an adsorption tower in sequence. The waste gas after cracking in the cracking incinerator first enters the flue gas quenching tower. Under the cooling effect of the flue gas quenching tower, the temperature of the waste gas is quickly reduced to below 220°C to reduce the amount of dioxin regeneration. The waste gas then passes through the purification tank to remove some acidic gases and dioxins in the flue gas. The waste gas then passes through the dust removal tower. Under the action of the dust removal tower, the particulate matter and dust contained in the waste gas can be filtered out. After passing through the dust removal tower, the waste gas enters the deacidification tower. The alkali solution in the deacidification tower reacts with the sulfide and chloride in the flue gas to remove the sulfide and chloride in the waste gas. Finally, the waste gas enters the adsorption tower. The adsorption tower can adsorb the heavy metals and residual dioxins contained in the waste gas. Then the purified waste gas is discharged from the outlet of the adsorption tower through the induced draft fan to the chimney.

[0053] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0054] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A waste gas treatment heat recovery device, characterized in that: include: The waste gas treatment unit comprises a pyrolysis incinerator, a gas pipeline and a waste gas treatment device, wherein the gas pipeline is connected to the pyrolysis incinerator, the gas pipeline is used to discharge the waste gas generated by the pyrolysis incinerator, the other end of the gas pipeline is connected to the waste gas treatment device, and the waste gas treatment device is used to purify the waste gas; A heat recovery unit comprises a water tank, a heat exchange tube group and a pump, wherein the heat exchange tube group is arranged on the outer wall of the gas pipeline and contacts therewith; the heat exchange tube group is a spiral structure, and a channel is formed in the middle of the heat exchange tube group, and the heat exchange tube group is sleeved on the gas pipeline through the channel; the heat exchange tube group has a water inlet and a water outlet, and the pump is connected to the water inlet of the heat exchange tube for extracting water in the water tank to the heat exchange tube group, and the water outlet of the heat exchange tube group is connected to the water tank.

2. The waste gas treatment heat recovery device according to claim 1, characterized in that: The heat exchange tube group includes a plurality of spiral tube sections connected end to end in sequence, each of the spiral tube sections has a heat exchange surface abutting against one side of the outer surface of the gas transmission pipe, and a gap is provided between two adjacent spiral tube sections.

3. The waste gas treatment heat recovery device according to claim 2, characterized in that: A heat transfer sheet is provided between any two adjacent spiral pipe sections, and the heat transfer sheet is used to close the gap between the two adjacent spiral pipe sections. Both sides of the heat transfer sheet are fixedly connected to the two adjacent spiral pipe sections respectively, and the bottom surface of the heat transfer sheet is in contact with the outer surface of the gas transmission pipe.

4. The waste gas treatment heat recovery device according to claim 3, characterized in that: The cross-sectional shape of the spiral pipe segment is an equilateral triangle, and the heat exchange surface is any surface of the spiral pipe segment.

5. The waste gas treatment heat recovery device according to claim 4, characterized in that: The spiral pipe section has two side walls facing away from the gas delivery pipe, and a heat insulation layer is arranged between the two side walls of two adjacent spiral pipe sections on the heat transfer plate.

6. The waste gas treatment heat recovery device according to claim 5, characterized in that: The top surface of the thermal insulation layer is flush with the top surface of the spiral pipe section; or protrudes from the top surface of the spiral pipe section.

7. The waste gas treatment heat recovery device according to claim 3, characterized in that: A plurality of convex ribs are arranged on a side of the heat transfer plate away from the gas delivery pipe, and two ends of the convex ribs are connected to the side wall between two adjacent spiral pipe sections.

8. The waste gas treatment heat recovery device according to claim 1, characterized in that: The water tank is connected with a water supply pipe and a drainage pipe. The water supply pipe is used to replenish water to the water tank, and a first valve is arranged on the water supply pipe; the drainage pipe is provided with a second valve, and the drainage pipe is used to discharge the hot water after heat exchange in the water tank to the hot water supply system.

9. The waste gas treatment heat recovery device according to claim 8, characterized in that: The heat recovery unit includes a temperature control monitoring component, which includes a liquid level sensor, a temperature sensor and a controller. The temperature sensor is arranged in the water tank and is used to monitor the liquid level of the water tank. The temperature sensor is used to monitor the temperature in the water tank. The temperature sensor, the liquid level sensor, the first valve and the second valve are all electrically connected to the controller. When the water temperature in the water tank exceeds a first threshold, the controller controls the second valve to open; when the water level in the water tank is lower than a first liquid level, the controller controls the second valve to close and controls the first valve to open to add water to the water tank; when the water in the water tank is added to a second liquid level, the controller controls the second valve to close.

10. The waste gas treatment heat recovery device according to claim 1, characterized in that: The heat recovery unit comprises a heat-insulating shell, and the heat-insulating shell is sleeved on the outside of the heat exchange tube group.

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