High-low temperature waste heat recovery spray tower and system

Abstract

The utility model belongs to flue gas purification technical field especially relates to a high and low temperature waste heat recovery spray tower and system, high and low temperature waste heat recovery spray tower includes the tower body, the inside space of the tower body is formed high temperature water pool in the lower side of inlet channel, is equipped with low temperature water pool between demisting structure and inlet channel, still include the first stage spray structure of setting in the lower side of low temperature water pool, the first stage water pump of being connected in high temperature water pool and first stage spray structure, the second stage spray structure of setting in the lower side of demisting structure and the second stage water pump of being connected in low temperature water pool and second stage spray structure, is equipped with water flow guide structure between second stage spray structure and low temperature water pool, high and low temperature waste heat recovery system includes high and low temperature waste heat recovery spray tower, sets up the heat exchanger between first stage water pump and first stage spray structure, sets up the heat pump unit between second stage water pump and second stage spray structure, has solved the problem that the waste heat recovery cost of existing spray tower is big.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas purification technology, and in particular relates to a high and low temperature waste heat recovery spray tower and system. Background Technology

[0002] The flue gas generated during the production processes of industries such as steel, cement, and thermal power needs to be desulfurized according to environmental protection requirements. The temperature of the flue gas emitted after desulfurization is around 55℃, leaving a large space for waste heat recovery and utilization, and has great potential for energy saving.

[0003] Currently, the recovered waste heat is mainly used for heating systems, thermal cooling systems, preheating raw materials, and supplying domestic hot water. Due to the limited structure of the existing spray tower, the waste heat recovery of flue gas can only be achieved through heat exchange between the heat pump unit and the spray tower. However, the energy consumption of the heat pump unit is relatively high, which increases the cost of waste heat recovery. The existing spray tower is no longer suitable for the low-energy consumption requirements. Utility Model Content

[0004] The purpose of this utility model is to provide a high and low temperature waste heat recovery spray tower and system, which aims to solve the problem of high waste heat recovery cost of existing spray towers.

[0005] This utility model discloses a high and low temperature waste heat recovery spray tower, which includes a tower body, a demisting structure fixed to the upper side of the internal space of the tower body, an air inlet channel on the side of the tower body, an exhaust channel on the top of the tower body, a high temperature water storage tank formed in the internal space of the tower body located below the air inlet channel, a low temperature water storage tank fixed to the internal space of the tower body between the demisting structure and the air inlet channel, and a flue gas channel formed between the low temperature water storage tank and the inner wall of the tower body; it also includes a primary spraying structure disposed below the low temperature water storage tank, a primary water pump connected between the high temperature water storage tank and the primary spraying structure, a secondary spraying structure disposed below the demisting structure, and a secondary water pump connected between the low temperature water storage tank and the secondary spraying structure, and a water flow guiding structure disposed between the secondary spraying structure and the low temperature water storage tank.

[0006] As an improvement, the low-temperature water storage tank is located in the internal space of the tower body on the side away from the air intake channel, and the flue gas channel is formed between the low-temperature water storage tank and the inner wall of the tower body on the side corresponding to the air intake channel. A flue gas guiding structure is provided in the internal space of the tower body on the upper side corresponding to the air intake channel for guiding the flue gas to the lower side of the primary spray structure.

[0007] As an improvement, the flue gas guiding structure is configured as a flue gas guide plate, which is inclined from the upper side of the air inlet channel to the lower side of the primary spray structure. The side of the flue gas guide plate away from the air inlet channel is the upper side, and a vertical distance is provided between the upper side of the flue gas guide plate and the primary spray structure.

[0008] As an improvement, the flue gas guide plate is sealed to the inner wall of the tower body, and the upper side of the flue gas guide plate extends into the area below the primary spray structure.

[0009] As an improvement, the low-temperature water storage tank is located on the side of the air intake channel corresponding to the side of the air intake channel on the central axis of the tower body.

[0010] As an improvement, the water flow guiding structure is provided on the upper side of the flue gas passage.

[0011] As an improvement, the water flow guiding structure is configured as a water flow guiding plate. The water flow guiding plate is inclined from the inner side wall of the tower body on the side corresponding to the air intake channel towards the upper side of the low temperature water storage tank. The side of the water flow guiding plate corresponding to the upper side of the low temperature water storage tank is the lower side, and a vertical distance is provided between the lower side of the water flow guiding plate and the low temperature water storage tank.

[0012] As an improvement, the water flow guide plate is sealed to the inner wall of the tower body, and the lower side of the water flow guide plate extends into the area above the low-temperature water storage tank.

[0013] This utility model also discloses a high and low temperature waste heat recovery system, which includes a high and low temperature waste heat recovery spray tower, and a heat exchanger disposed between the primary water pump and the primary spray structure. The hot end inlet of the heat exchanger is connected to the outlet of the primary water pump, and the hot end outlet of the heat exchanger is connected to the primary spray structure. A heat pump unit is disposed between the secondary water pump and the secondary spray structure. The hot end inlet of the heat pump unit is connected to the outlet of the secondary water pump, and the hot end outlet of the heat pump unit is connected to the secondary spray structure.

[0014] As an improvement, the high and low temperature waste heat recovery system also includes a return pipe connected to the cold end inlet of the heat exchanger and the cold end inlet of the heat pump unit, respectively, and a heating pipe connected to the cold end outlet of the heat exchanger and the cold end outlet of the heat pump unit, respectively.

[0015] The beneficial effects achieved by adopting the above technical solution are as follows:

[0016] This utility model of a high and low temperature waste heat recovery spray tower includes a tower body, a demisting structure fixed to the upper side of the internal space of the tower body, an air inlet channel on the side of the tower body, an exhaust channel at the top of the tower body, a high temperature water storage tank formed in the internal space of the tower body located below the air inlet channel, a low temperature water storage tank fixed to the internal space of the tower body between the demisting structure and the air inlet channel, and a flue gas channel formed between the low temperature water storage tank and the inner wall of the tower body; it also includes a primary spraying structure located below the low temperature water storage tank, a primary water pump connected between the high temperature water storage tank and the primary spraying structure, a secondary spraying structure located below the demisting structure, and a secondary water pump connected between the low temperature water storage tank and the secondary spraying structure, and a water flow guiding structure between the secondary spraying structure and the low temperature water storage tank. The high and low temperature waste heat recovery system of this utility model includes a high and low temperature waste heat recovery spray tower, a heat exchanger installed between a primary water pump and a primary spray structure, the hot end inlet of the heat exchanger being connected to the outlet of the primary water pump and the hot end outlet of the heat exchanger being connected to the primary spray structure, and a heat pump unit installed between a secondary water pump and a secondary spray structure, the hot end inlet of the heat pump unit being connected to the outlet of the secondary water pump and the hot end outlet of the heat pump unit being connected to the secondary spray structure.

[0017] During operation, cooling water is pre-filled into the high-temperature and low-temperature water storage tanks respectively. Flue gas flows into the internal space of the tower through the air inlet channel on the side of the tower. The cooling water in the high-temperature water storage tank, under the suction of the primary pump, flows into the heat exchanger from the hot end inlet. After heat exchange occurs inside the heat exchanger, it flows out from the hot end outlet and is then sprayed out through the primary spray structure to provide primary cooling for the flue gas flowing into the internal space of the tower. Because the flue gas flowing in from the air inlet channel on the side of the tower is relatively high in temperature, the cooling water sprayed by the primary spray structure cools the high-temperature flue gas, forming high-temperature cooling water that falls into the high-temperature water storage tank. The high-temperature flue gas then undergoes a... After primary cooling, the flue gas becomes low-temperature flue gas. The low-temperature flue gas after primary cooling flows through the flue gas channel to the low-temperature water storage tank and the secondary spray structure. The cooling water inside the low-temperature water storage tank flows into the heat pump unit from the hot end inlet under the suction of the secondary water pump. After heat exchange occurs inside the heat pump unit, it flows out from the hot end outlet of the heat pump unit and is then sprayed out through the secondary spray structure to perform secondary cooling on the low-temperature flue gas after primary cooling. The cooling water sprayed out by the secondary spray structure performs secondary cooling on the lower temperature flue gas and forms low-temperature cooling water that falls into the low-temperature water storage tank. The flue gas after secondary cooling is demisted by the demisting structure and then discharged through the exhaust channel.

[0018] Since a portion of the heated medium is sent to the heat exchanger for heat exchange, no energy is required for waste heat recovery. The other portion is sent to the heat pump unit for heat exchange, which reduces the amount of heated medium sent to the heat pump unit. A small-power heat pump unit can meet the needs of waste heat recovery, thereby reducing energy consumption and achieving the goal of reducing waste heat recovery costs. This solves the problem of high waste heat recovery costs in existing spray towers. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the high and low temperature waste heat recovery spray tower of this utility model;

[0020] Figure 2 This is a schematic diagram of the high and low temperature waste heat recovery system of this utility model;

[0021] Among them, 10. Tower body; 11. High-temperature water storage tank; 12. Air inlet channel; 13. Exhaust channel; 20. Demisting structure; 30. Low-temperature water storage tank; 31. Flue gas channel; 41. Primary spray structure; 42. Primary water pump; 43. Flue gas guide plate; 51. Secondary spray structure; 52. Secondary water pump; 53. Water flow guide plate; 60. Heat exchanger; 70. Heat pump unit. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Figure 1 and Figure 2 This is a structural schematic diagram of the high and low temperature waste heat recovery spray tower and system of this utility model, wherein, Figure 1 This diagram shows the internal structure of the high and low temperature waste heat recovery spray tower of this utility model. Figure 2 A schematic diagram of the high and low temperature waste heat recovery system of this utility model is shown. For ease of explanation, only the parts relevant to this utility model are shown in the figure.

[0024] It should be noted that if the present invention involves directional indicators, such as up, down, front, back, left, right, etc., the directional indicators are only used to explain the relative positional relationship between the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. If the present invention involves descriptions such as "first", "second", etc., the descriptions such as "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.

[0025] like Figure 1 As shown, this utility model discloses a high and low temperature waste heat recovery spray tower, including a tower body 10, a demisting structure 20 fixed to the upper side of the internal space of the tower body 10, an air inlet channel 12 provided on the side of the tower body 10, an exhaust channel 13 provided at the top of the tower body 10, a high temperature water storage tank 11 formed in the internal space of the tower body 10 located below the air inlet channel 12, and a low temperature water storage tank 30 fixed to the internal space of the tower body 10 between the demisting structure 20 and the air inlet channel 12. A flue gas passage 31 is formed between them, and it also includes a primary spray structure 41 set below the low temperature water storage tank 30, a primary water pump 42 connected between the high temperature water storage tank 11 and the primary spray structure 41, a secondary spray structure 51 set below the demisting structure 20, and a secondary water pump 52 connected between the low temperature water storage tank 30 and the secondary spray structure 51. A water flow guiding structure for guiding the cooling water sprayed by the secondary spray structure 51 into the low temperature water storage tank 30 is provided between the secondary spray structure 51 and the low temperature water storage tank 30.

[0026] For ease of understanding, combined with Figure 2 The working principle and process of the high and low temperature waste heat recovery spray tower are explained as follows:

[0027] During installation, a heat exchanger 60 is installed between the primary water pump 42 and the primary spray structure 41. The hot end inlet of the heat exchanger 60 is connected to the outlet of the primary water pump 42, and the hot end outlet of the heat exchanger 60 is connected to the primary spray structure 41.

[0028] A heat pump unit 70 is installed between the secondary water pump 52 and the secondary spray structure 51. The hot end inlet of the heat pump unit 70 is connected to the outlet of the secondary water pump 52, and the hot end outlet of the heat pump unit 70 is connected to the secondary spray structure 51.

[0029] The return pipe for conveying the heated medium is connected to the cold end inlet of the heat exchanger 60 and the cold end inlet of the heat pump unit 70, respectively, and the cold end outlet of the heat exchanger 60 and the cold end outlet of the heat pump unit 70 are connected to the heating pipe.

[0030] Specifically, the structure and working principle of the heat exchanger 60 and the heat pump unit 70 are well-known technologies, and their specific structures will not be described in detail here.

[0031] During operation, cooling water is pre-filled into the high-temperature water storage tank 11 and the low-temperature water storage tank 30 respectively. Flue gas flows into the internal space of the tower body 10 through the air inlet channel 12 on the side of the tower body 10. The cooling water inside the high-temperature water storage tank 11, under the suction of the primary water pump 42, flows into the heat exchanger 60 from the hot end inlet. After heat exchange occurs inside the heat exchanger 60, it flows out from the hot end outlet and is then sprayed out through the primary spray structure 41 to perform primary cooling on the flue gas flowing into the internal space of the tower body 10. Because the temperature of the flue gas flowing in from the air inlet channel 12 on the side of the tower body 10 is relatively high, the cooling water sprayed out by the primary spray structure 41 cools the high-temperature flue gas, forming high-temperature cooling water that falls into the high-temperature water storage tank 11. After primary cooling, the flue gas becomes low-temperature flue gas. The low-temperature flue gas after primary cooling flows through flue gas channel 31 to the space between low-temperature water storage tank 30 and secondary spray structure 51. Cooling water inside the low-temperature water storage tank 30 flows into the heat pump unit 70 from the hot end inlet under the suction action of the secondary water pump 52. After heat exchange occurs inside the heat pump unit 70, it flows out from the hot end outlet of the heat pump unit 70 and is then sprayed out through the secondary spray structure 51 to perform secondary cooling on the low-temperature flue gas after primary cooling. The cooling water sprayed out by the secondary spray structure 51 forms low-temperature cooling water after secondary cooling of the lower temperature flue gas and falls into the low-temperature water storage tank 30. The flue gas after secondary cooling is demisted by the demisting structure 20 and discharged through the exhaust channel 13.

[0032] Taking heating water as an example, the temperature of the high-temperature flue gas flowing into the internal space of the tower body 10 from the air inlet channel 12 is 55℃;

[0033] The primary spray structure 41 sprays and cools the high-temperature flue gas at 55°C. The cooling water sprayed from the primary spray structure 41 forms high-temperature cooling water at 50°C and falls into the high-temperature water storage tank 11. After primary cooling, the high-temperature flue gas at 55°C is reduced to low-temperature flue gas at 49°C. At the same time, the primary water pump 42 transports the high-temperature cooling water at 50°C inside the high-temperature water storage tank 11 to the hot end inlet of the heat exchanger 60. The return pipe transports the heating water (39°C) to the cold end inlet of the heat exchanger 60. The high-temperature cooling water at 50°C and the heating water at 39°C undergo heat exchange in the heat exchanger 60, heating the heating water at 39°C to 46°C and reducing the high-temperature cooling water at 50°C to 45°C. The cooling water flows out from the hot end outlet of the heat exchanger 60. The heating water at 46°C flows out from the cold end outlet of the heat exchanger 60 and circulates to the user end. The cooling water at 45°C flows out from the hot end outlet of the heat exchanger 60 and flows into the primary spray structure 41.

[0034] The 49°C low-temperature flue gas after primary cooling flows through flue gas channel 31 to the space between the low-temperature water storage tank 30 and the secondary spray structure 51. The secondary spray structure 51 sprays and cools the 49°C low-temperature flue gas, and the cooling water sprayed out by the secondary spray structure 51 forms 36°C low-temperature cooling water that falls into the low-temperature water storage tank 30. After secondary cooling, the 49°C low-temperature flue gas is reduced to 27°C. The low-temperature flue gas is then demisted by the demisting structure 20 and discharged through the exhaust channel 13. At the same time, the secondary water pump 52 pumps the 36°C low-temperature cooling water inside the low-temperature water storage tank 30. Cooling water is delivered to the hot end inlet of the heat pump unit 70, and the return pipe delivers heating water (39℃) to the cold end inlet of the heat pump unit 70. The heat pump unit 70 transfers the heat energy of the 36℃ low-temperature cooling water to the heating water. The 39℃ heating water is heated to 46℃. After the 36℃ low-temperature cooling water transfers its heat energy, it is reduced to 27℃. The 46℃ heating water flows out from the cold end outlet of the heat pump unit 70 and circulates to the user end. The 27℃ cooling water flows out from the hot end outlet of the heat pump unit 70 and flows into the secondary water pump 52. The heat pump unit 70 consumes electrical energy when it is working.

[0035] Since a portion of the heated medium is sent to heat exchanger 60 for heat exchange, no energy is consumed during waste heat recovery. The other portion is sent to heat pump unit 70 for heat exchange, reducing the amount of heated medium sent to heat pump unit 70. A small-power heat pump unit 70 can meet the waste heat recovery requirements, reducing energy consumption and thus lowering waste heat recovery costs. This invention provides a novel high and low temperature waste heat recovery spray tower, solving the problem of high waste heat recovery costs in existing spray towers.

[0036] In this invention, a low-temperature water storage tank 30 is disposed in the internal space of the tower body 10 on the side away from the air inlet channel 12. A flue gas channel 31 is formed between the low-temperature water storage tank 30 and the inner wall of the tower body 10 on the side corresponding to the air inlet channel 12. A flue gas guiding structure is provided in the internal space of the tower body 10 on the upper side corresponding to the air inlet channel 12 to guide the flue gas to the lower side of the primary spray structure 41, so that the flue gas can flow to the lower side of the primary spray structure 41 for primary cooling.

[0037] Specifically, the flue gas guiding structure is configured as a flue gas guide plate 43, which is inclined from the upper side of the air inlet channel 12 towards the lower side of the primary spray structure 41. The side of the flue gas guide plate 43 away from the air inlet channel 12 is the upper side, and a vertical gap is provided between the upper side of the flue gas guide plate 43 and the primary spray structure 41. Typically, the flue gas guide plate 43 is sealed to the inner wall of the tower body 10, and the upper side of the flue gas guide plate 43 extends into the area below the primary spray structure 41.

[0038] Furthermore, the side wall of the low-temperature water storage tank 30 corresponding to the air intake channel 12 is located on the side of the central axis of the tower body 10 close to the air intake channel 12, which can increase the capacity of the low-temperature water storage tank 30.

[0039] In some other embodiments, the low-temperature water storage tank 30 is located at the central axis of the tower body 10, and a flue gas channel 31 is formed between the side wall of the low-temperature water storage tank 30 and the inner wall of the tower body 10. The flue gas channel 31 is annular in shape. Typically, the low-temperature water storage tank 30 is fixedly connected by at least two connecting rods located between the side wall of the low-temperature water storage tank 30 and the inner wall of the tower body 10. Correspondingly, the flue gas guiding structure is set as a conical cylinder, with its large orifice port corresponding to one side of the secondary spray structure 51 and its small orifice port corresponding to the low-temperature water storage tank 30.

[0040] Of course, the low-temperature water storage tank 30 can also be set in the internal space of the tower body 10 on the side close to the air intake channel 12. In this case, the flue gas flowing in from the air intake channel 12 is directly located in the range below the first-stage spray structure 41, and there is no need to set up a flue gas guiding structure.

[0041] In this utility model, a water flow guiding structure is provided on the upper side of the flue gas channel 31 to guide the cooling water sprayed from the secondary spray structure 51 in the area of ​​the flue gas channel 31 to the low temperature water storage tank 30.

[0042] Specifically, the water flow guiding structure is configured as a water flow guide plate 53. The water flow guide plate 53 is inclined upwards from the inner wall of the tower body 10 on the side corresponding to the air inlet channel 12 towards the low-temperature water storage tank 30. The side of the water flow guide plate 53 corresponding to the upper side of the low-temperature water storage tank 30 is the lower side, and a vertical distance is provided between the lower side of the water flow guide plate 53 and the low-temperature water storage tank 30. Typically, the water flow guide plate 53 is sealed to the inner wall of the tower body 10, and the lower side of the water flow guide plate 53 extends into the area above the low-temperature water storage tank 30.

[0043] In this utility model, the demisting structure 20 is a wire mesh demister, a baffle plate demister, etc. The structure and demisting principle of the demisting structure 20 are known technologies, and its specific structure will not be described in detail here.

[0044] like Figure 2 As shown, this utility model also discloses a high and low temperature waste heat recovery system, including the above-mentioned high and low temperature waste heat recovery spray tower, and further including:

[0045] The heat exchanger 60 is installed between the primary water pump 42 and the primary spray structure 41. The hot end inlet of the heat exchanger 60 is connected to the outlet of the primary water pump 42, and the hot end outlet of the heat exchanger 60 is connected to the primary spray structure 41.

[0046] The heat pump unit 70 is installed between the secondary water pump 52 and the secondary spray structure 51. The hot end inlet of the heat pump unit 70 is connected to the outlet of the secondary water pump 52, and the hot end outlet of the heat pump unit 70 is connected to the secondary spray structure 51.

[0047] During installation, the return pipe for conveying the heated medium is connected to the cold end inlet of heat exchanger 60 and the cold end inlet of heat pump unit 70, respectively. The cold end outlet of heat exchanger 60 and the cold end outlet of heat pump unit 70 are connected to the heating pipe. Low-temperature heating water for heating is conveyed through the return pipe to the cold end inlet of heat exchanger 60 and the cold end inlet of heat pump unit 70, respectively. After being heated by heat exchanger 60 and heat pump unit 70, it forms high-temperature heating water, which is then conveyed to the user end through the heating pipe.

[0048] The above description is only some embodiments of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high and low temperature waste heat recovery spray tower, comprising a tower body, a demisting structure fixed to the upper side of the internal space of the tower body, an air inlet channel provided on the side of the tower body, and an exhaust channel provided at the top of the tower body, characterized in that, A high-temperature water storage tank is formed in the internal space of the tower body located below the air intake channel. A low-temperature water storage tank is fixed in the internal space of the tower body between the demisting structure and the air intake channel. A flue gas channel is formed between the low-temperature water storage tank and the inner wall of the tower body. The tower body also includes a primary spray structure located below the low-temperature water storage tank, a primary water pump connected between the high-temperature water storage tank and the primary spray structure, a secondary spray structure located below the demisting structure, and a secondary water pump connected between the low-temperature water storage tank and the secondary spray structure. A water flow guiding structure is provided between the secondary spray structure and the low-temperature water storage tank.

2. The high and low temperature waste heat recovery spray tower according to claim 1, characterized in that, The low-temperature water storage tank is located in the internal space of the tower body on the side away from the air intake channel. The flue gas channel is formed between the low-temperature water storage tank and the inner wall of the tower body on the side corresponding to the air intake channel. A flue gas guiding structure is provided in the internal space of the tower body on the upper side corresponding to the air intake channel for guiding the flue gas to the lower side of the primary spray structure.

3. The high and low temperature waste heat recovery spray tower according to claim 2, characterized in that, The flue gas guiding structure is configured as a flue gas guiding plate, which is inclined from the upper side of the air inlet channel to the lower side of the primary spray structure. The side of the flue gas guiding plate away from the air inlet channel is the upper side, and a vertical distance is provided between the upper side of the flue gas guiding plate and the primary spray structure.

4. The high and low temperature waste heat recovery spray tower according to claim 3, characterized in that, The flue gas guide plate is sealed to the inner wall of the tower body, and the upper side of the flue gas guide plate extends into the area below the primary spray structure.

5. The high and low temperature waste heat recovery spray tower according to claim 2, characterized in that, The low-temperature water storage tank is located on the side of the air intake channel corresponding to the side of the air intake channel on the central axis of the tower body.

6. The high and low temperature waste heat recovery spray tower according to any one of claims 2 to 5, characterized in that, The water flow guiding structure is provided on the upper side of the flue gas passage.

7. The high and low temperature waste heat recovery spray tower according to claim 6, characterized in that, The water flow guiding structure is configured as a water flow guiding plate. The water flow guiding plate is inclined from the inner side wall of the tower body on the side corresponding to the air intake channel towards the upper side of the low temperature water storage tank. The side of the water flow guiding plate corresponding to the upper side of the low temperature water storage tank is the lower side. A vertical distance is provided between the lower side of the water flow guiding plate and the low temperature water storage tank.

8. The high and low temperature waste heat recovery spray tower according to claim 7, characterized in that, The water flow guide plate is sealed to the inner wall of the tower body, and the lower side of the water flow guide plate extends into the area above the low temperature water storage tank.

9. A high and low temperature waste heat recovery system, characterized in that, The high and low temperature waste heat recovery spray tower as described in any one of claims 1 to 8 further includes: A heat exchanger is installed between the primary water pump and the primary spray structure. The hot end inlet of the heat exchanger is connected to the outlet of the primary water pump, and the hot end outlet of the heat exchanger is connected to the primary spray structure. A heat pump unit is installed between the secondary water pump and the secondary spray structure. The hot end inlet of the heat pump unit is connected to the outlet of the secondary water pump, and the hot end outlet of the heat pump unit is connected to the secondary spray structure.

10. The high and low temperature waste heat recovery system according to claim 9, characterized in that, The high and low temperature waste heat recovery system also includes return pipes connected to the cold end inlet of the heat exchanger and the cold end inlet of the heat pump unit, respectively, and heating pipes connected to the cold end outlet of the heat exchanger and the cold end outlet of the heat pump unit, respectively.

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