Urban sewage treatment plant waste heat recovery and heat pump coupling system

Abstract

The utility model relates to the technical field of sewage treatment, and discloses an urban sewage treatment plant waste heat recovery and heat pump coupling system which comprises a sewage tank, a heat pump unit and a heat exchanger, an outlet of the sewage tank is connected with a purification device through a pipeline, and the purification device is connected with the heat absorption end of the heat exchanger through a first circulating water pipe. The heat release end of the heat exchanger is connected with the heat absorption end of the heat pump unit through a second circulating water pipe, and the heat release end of the heat pump unit is connected with the heating system and the sewage tank through a third circulating water pipe and a fourth circulating water pipe. Scattered waste heat generated at all positions of the biochemical purification device is collected in a centralized mode through the first circulating water pipe, meanwhile, low-temperature heat energy is used for providing high-temperature heat energy through the heat exchanger and the heat pump unit, and the low-temperature waste heat generated in the sewage treatment process is raised to the high enough temperature through the heat pump. And meanwhile, high-temperature heat is used for user heating and sewage preheating of the sewage tank, energy needed for sewage preheating is reduced, and meanwhile the preheating utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a waste heat recovery and heat pump coupling system of a municipal sewage treatment plant. Background Art

[0002] Sewage contains organic chemical energy and residual heat energy, but this potential has not been taken seriously. Studies have shown that the potential (chemical energy + thermal energy) contained in urban sewage can reach 9 to 10 times the energy consumption of sewage treatment. At the same time, the conclusion of previous studies shows that chemical energy in urban sewage accounts for about 10% of the total potential value, while 90% of sewage potential is generated by heat. If the heat energy in sewage is reasonably utilized, sewage treatment plants will also be transformed from energy-consuming plants to "energy plants".

[0003] The waste heat generated by existing wastewater treatment devices is mostly low-grade thermal energy, which is mostly used for heating, heating water, etc., and its utilization rate is low.

[0004] Therefore, we proposed a waste heat recovery and heat pump coupling system for urban sewage treatment plants to solve the above problems. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art in the above background technology, the purpose of the utility model is to provide a waste heat recovery and heat pump coupling system for a municipal sewage treatment plant to solve the problems raised in the above background technology.

[0007] (II) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A waste heat recovery and heat pump coupling system for a municipal sewage treatment plant comprises a sewage tank, a heat pump unit and a heat exchanger, wherein the sewage tank outlet is connected to a purification device through a pipeline, the purification device is connected to a heat absorption end of the heat exchanger through a first circulating water pipe, the heat release end of the heat exchanger is connected to a heat absorption end of the heat pump unit through a second circulating water pipe, and the heat release end of the heat pump unit is connected to a heating system and a sewage tank through a third circulating water pipe and a fourth circulating water pipe, respectively.

[0010] Furthermore, the purification device includes a biochemical treatment mechanism, an aeration and stirring mechanism, a filter press mechanism, a sludge drying mechanism and a drainage mechanism.

[0011] Furthermore, the first circulating water pipe includes an inlet main pipe and an outlet main pipe, the inlet of the inlet main pipe is provided with a first inlet branch pipe, a second inlet branch pipe, a third inlet branch pipe, and a fourth inlet branch pipe respectively connected to the biochemical treatment mechanism, the aeration stirring mechanism, the filter press mechanism and the sludge drying mechanism, and the outlet of the outlet main pipe is provided with a first outlet branch pipe, a second outlet branch pipe, a third outlet branch pipe, and a fourth outlet branch pipe respectively connected to the biochemical treatment mechanism, the aeration stirring mechanism, the filter press mechanism and the sludge drying mechanism.

[0012] Furthermore, a water collecting tray is provided at the connection between the water inlet main pipe and the first water inlet branch pipe, the second water inlet branch pipe, the third water inlet branch pipe, and the fourth water inlet branch pipe, and a water distribution tray is provided at the connection between the water outlet main pipe and the first water outlet branch pipe, the second water outlet branch pipe, the third water outlet branch pipe, and the fourth water outlet branch pipe.

[0013] Furthermore, a water pump is provided on the first circulating water pipe, the sewage tank is connected to the biochemical treatment mechanism through the water pump, the biochemical treatment mechanism is connected to the aeration and stirring mechanism through the water pump, the aeration and stirring mechanism is connected to the filter press mechanism through the water pump, and the filter press mechanism is connected to the sludge drying mechanism and the drainage mechanism through the water pump.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The scattered waste heat generated in various places of the biochemical purification device is collected centrally through the first circulating water pipe. At the same time, the low-temperature thermal energy is used to provide high-temperature thermal energy through the heat exchanger and the heat pump unit. The low-temperature waste heat generated in the sewage treatment process is raised to a sufficiently high temperature through the heat pump. At the same time, the high-temperature heat is used for user heating and sewage preheating in the sewage tank, reducing the energy required for sewage preheating and improving the preheating utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the waste heat recovery and heat pump coupling system of the urban sewage treatment plant of the utility model.

[0018] In the figure: sewage tank 1, biochemical treatment mechanism 21, aeration stirring mechanism 22, filter press mechanism 23, sludge drying mechanism 24, drainage mechanism 25, heat pump unit 3, heat exchanger 4, first circulating water pipe 5, water inlet main pipe 51, first water inlet branch pipe 511, second water inlet branch pipe 512, third water inlet branch pipe 513, fourth water inlet branch pipe 514, water outlet main pipe 52, first water outlet branch pipe 521, second water outlet branch pipe 522, third water outlet branch pipe 523, fourth water outlet branch pipe 524, second circulating water pipe 6, third circulating water pipe 7, fourth circulating water pipe 8, heating system 9, water collecting tray 10, water distribution tray 11, water pump 12. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 As shown, the utility model provides a waste heat recovery and heat pump coupling system for a municipal sewage treatment plant, comprising a sewage tank 1, a purification device, a heat pump unit 3, a heat exchanger 4 and the heat pump unit 3, the purification device is connected to the heat absorption end of the heat exchanger 4 through a first circulating water pipe 5, the heat release end of the heat exchanger 4 is connected to the heat absorption end of the heat pump unit 3 through a second circulating water pipe 6, the heat release end of the heat pump unit 3 is connected to a heating system 9 and a sewage tank 1 through a third circulating water pipe 7 and a fourth circulating water pipe 8 respectively, a section of the fourth circulating water pipe 8 located in the sewage tank 1 is a closed end and is only used for heat exchange, and is not connected to the sewage tank 1.

[0021] The purification device comprises a biochemical treatment mechanism 21, an aeration and stirring mechanism 22, a filter press mechanism 23, a sludge drying mechanism 24 and a drainage mechanism 25. The sewage tank 1 is connected to the biochemical treatment mechanism 21 through a water pump 12. The biochemical treatment mechanism 21 is connected to the aeration and stirring mechanism 22 through a water pump 12. The aeration and stirring mechanism 22 is connected to the filter press mechanism 23 through a water pump 12. The filter press mechanism 23 is connected to the sludge drying mechanism 24 and the drainage mechanism 25 through a water pump 12. The biochemical treatment mechanism 21 is used for aerobic or anaerobic reaction of sludge, and heat is released in the process. The aeration and stirring mechanism 22 generates heat by friction during the stirring process. When the filter press mechanism 23 performs filter press separation on sewage sludge, waste heat is generated in the mechanical operation process. The sludge drying mechanism 24 is used for drying sludge, and waste heat is generated in the process.

[0022] The first circulating water pipe 5 includes a water inlet pipe 51 and a water outlet pipe 52. The water inlet pipe 51 is provided with a water pump 12 for water circulation. The water inlet of the water inlet pipe 51 is provided with a first water inlet branch pipe 511, a second water inlet branch pipe 512, a third water inlet branch pipe 513, and a fourth water inlet branch pipe 514 connected to the biochemical treatment mechanism 21, the aeration and stirring mechanism 22, the filter press mechanism 23, and the sludge drying mechanism 24 respectively. The water outlet pipe 52 includes a first water outlet branch pipe 521, a second water outlet branch pipe 522, a third water outlet branch pipe 513, and a fourth water inlet branch pipe 514 connected to the biochemical treatment mechanism 21, the aeration and stirring mechanism 22, the filter press mechanism 23, and the sludge drying mechanism 24. The water branch pipe 522, the third water outlet branch pipe 523, and the fourth water outlet branch pipe 524, that is, the biochemical treatment mechanism 21, the first water inlet branch pipe 511, the water inlet main pipe 51, the heat pump unit 3, the second circulating water pipe 6, the heat exchanger 4, the water outlet main pipe 52, and the first water outlet branch pipe 521 form a water circulation. It should be further explained that the ports of the first water inlet branch pipe 511 and the first water outlet branch pipe 521 are connected structures, that is, the first water inlet branch pipe 511 and the first water outlet branch pipe 521 pass through the biochemical treatment mechanism 21 only for heat exchange and are not connected thereto; similarly, other purification devices are also connected in this way in conjunction with their corresponding pipelines.

[0023] As a preferred technical solution of the utility model, it also includes a water collecting tray 10 and a water dividing tray 11. The water outlet port of the water collecting tray 10 is connected to the water inlet port of the water inlet main pipe 51, the water outlet ports of the first water inlet branch pipe 511, the second water inlet branch pipe 512, the third water inlet branch pipe 513 and the fourth water inlet branch pipe 514 are connected to the water inlet port of the water collecting tray 10, the water inlet port of the water dividing tray 11 is connected to the water outlet port of the water outlet main pipe 52, and the water inlet ports of the first water outlet branch pipe 521, the second water outlet branch pipe 522, the third water outlet branch pipe 523 and the fourth water outlet branch pipe 524 are respectively connected to multiple water outlet ports of the water dividing tray 11.

[0024] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0025] In the description of the present invention, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, the meaning of "plurality" is two or more, unless otherwise clearly and specifically limited.

[0026] For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances; for technicians in this field, they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A waste heat recovery and heat pump coupling system for a municipal sewage treatment plant, comprising a sewage tank (1), a heat pump unit (3) and a heat exchanger (4), wherein the outlet of the sewage tank (1) is connected to a purification device via a pipeline, and is characterized in that: The purification device is connected to the heat absorption end of the heat exchanger (4) via a first circulating water pipe (5), the heat release end of the heat exchanger (4) is connected to the heat absorption end of the heat pump unit (3) via a second circulating water pipe (6), and the heat release end of the heat pump unit (3) is connected to the heating system (9) and the sewage tank (1) respectively via a third circulating water pipe (7) and a fourth circulating water pipe (8).

2. The waste heat recovery and heat pump coupling system of a municipal sewage treatment plant according to claim 1 is characterized in that: The purification device comprises a biochemical treatment mechanism (21), an aeration and stirring mechanism (22), a filter pressing mechanism (23), a sludge drying mechanism (24) and a drainage mechanism (25).

3. A waste heat recovery and heat pump coupling system for a municipal sewage treatment plant according to claim 2, characterized in that: The first circulating water pipe (5) comprises a water inlet main pipe (51) and a water outlet main pipe (52); the water inlet of the water inlet main pipe (51) is provided with a first water inlet branch pipe (511), a second water inlet branch pipe (512), a third water inlet branch pipe (513), and a fourth water inlet branch pipe (514) respectively connected to the biochemical treatment mechanism (21), the aeration and stirring mechanism (22), the filter press mechanism (23), and the sludge drying mechanism (24); the water outlet of the water outlet main pipe (52) is provided with a first water outlet branch pipe (521), a second water outlet branch pipe (522), a third water outlet branch pipe (523), and a fourth water outlet branch pipe (524) respectively connected to the biochemical treatment mechanism (21), the aeration and stirring mechanism (22), the filter press mechanism (23), and the sludge drying mechanism (24).

4. A waste heat recovery and heat pump coupling system for a municipal sewage treatment plant according to claim 3, characterized in that: A water collecting pan (10) is provided at the connection between the water inlet main pipe (51) and the first water inlet branch pipe (511), the second water inlet branch pipe (512), the third water inlet branch pipe (513), and the fourth water inlet branch pipe (514); and a water distribution pan (11) is provided at the connection between the water outlet main pipe (52) and the first water outlet branch pipe (521), the second water outlet branch pipe (522), the third water outlet branch pipe (523), and the fourth water outlet branch pipe (524).

5. A waste heat recovery and heat pump coupling system for a municipal sewage treatment plant according to claim 4, characterized in that: A water pump (12) is provided on the first circulating water pipe (5); the sewage tank (1) is connected to the biochemical treatment mechanism (21) via the water pump (12); the biochemical treatment mechanism (21) is connected to the aeration stirring mechanism (22) via the water pump (12); the aeration stirring mechanism (22) is connected to the filter press mechanism (23) via the water pump (12); the filter press mechanism (23) is connected to the sludge drying mechanism (24) and the drainage mechanism (25) via the water pump (12).

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