Pharmaceutical wastewater waste heat recycling system

Abstract

The utility model discloses a pharmaceutical wastewater waste heat recycling system which is arranged between a final sedimentation tank and a UASB (Upflow Anaerobic Sludge Blanket) anaerobic tank and comprises a normal recycling unit, and the normal recycling unit comprises a heat pump unit and a heat exchanger; wherein a heat transfer medium circulates in the heat pump unit, and the final sedimentation tank is connected with the heat pump unit to form a waste heat recovery circulation loop which exchanges heat with the heat transfer medium; the heat exchanger is connected between the heat pump unit and the UASB anaerobic tank to transfer heat in the heat transfer medium to pharmaceutical wastewater in the UASB anaerobic tank; compared with the prior art, waste heat contained in water treated by the final sedimentation tank is reasonably utilized, and potential waste is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, and in particular to a pharmaceutical waste water waste heat recovery and utilization system. Background Art

[0002] The existing pharmaceutical wastewater treatment system includes a collection tank, a regulating tank, a sedimentation tank, a circulating water tank, a UASB anaerobic tank, an aerobic tank, a first intermediate sedimentation tank, a first A / O tank, a second intermediate sedimentation tank, a second A / O tank, a secondary sedimentation tank, a flocculation final sedimentation system and a final sedimentation tank, which are connected in sequence. This pharmaceutical wastewater treatment system can purify high-concentration pharmaceutical wastewater and comprehensive process wastewater to meet the standards for direct discharge.

[0003] However, pharmaceutical wastewater contains high organic chemical energy and residual heat energy, but this potential has not been taken seriously. Studies have shown that the potential energy (chemical energy + heat energy) contained in sewage can reach 9 to 10 times the energy consumption of sewage treatment. If the heat energy in sewage is reasonably utilized, the sewage treatment plant will also be transformed from an energy-consuming plant to an "energy plant".

[0004] Therefore, how to utilize the potential in the above-mentioned pharmaceutical wastewater treatment system is a problem that needs to be solved. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a pharmaceutical wastewater waste heat recovery and utilization system to solve the problem in the prior art of how to utilize the potential of the existing pharmaceutical wastewater treatment system.

[0006] To achieve the above purpose, the utility model adopts the following technical solution: a pharmaceutical wastewater waste heat recovery system, arranged between the final sedimentation tank and the UASB anaerobic tank, including a normal recovery unit, the normal recovery unit includes:

[0007] A heat pump unit, wherein a heat transfer medium circulates in the heat pump unit and the final settling tank is connected to the heat pump unit to form a waste heat recovery circulation loop for exchanging heat with the heat transfer medium;

[0008] A heat exchanger is connected between the heat pump unit and the UASB anaerobic tank to transfer heat in the heat transfer medium to the pharmaceutical wastewater in the UASB anaerobic tank.

[0009] Technical principle: When the pharmaceutical wastewater treatment system is in operation, one of the key points to control the stable and efficient operation of the UASB anaerobic tank is the medium temperature environment, and the water temperature is not less than 30 degrees Celsius; but when the ambient temperature is low, a heat source is needed to increase the temperature of the pharmaceutical wastewater in the UASB anaerobic tank. And about 4-6 months a year, additional steam is needed to heat the pharmaceutical wastewater in the UASB anaerobic tank. Here, the heat pump unit and the heat exchanger are used to transfer the residual heat in the water after the final sedimentation tank treatment to the pharmaceutical wastewater in the UASB anaerobic tank.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. This pharmaceutical wastewater waste heat recovery system rationally uses the heat pump unit and the heat exchanger to transfer the waste heat contained in the water treated in the final sedimentation tank to the pharmaceutical wastewater in the UASB anaerobic tank, which can reduce the use of additional steam and greatly reduce the waste of potential energy;

[0012] 2. Utilize the waste heat contained in the water after treatment in the final sedimentation tank. Since the pharmaceutical wastewater has been treated by the flocculation final sedimentation system, the chemical precipitation is strengthened in the water after treatment in the final sedimentation tank, thereby reducing the occurrence of scaling of the heat pump unit;

[0013] 3. Since part of the water treated by the pharmaceutical wastewater treatment system enters the pharmaceutical wastewater waste heat recovery system for use, water discharge is reduced, and CO2, NO x , SO2 and dust emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a process flow chart of an embodiment of the utility model;

[0015] Figure 2 This is a process flow chart of another embodiment of the utility model.

[0016] The reference numerals in the drawings of the specification include: final settling tank 1, UASB anaerobic tank 2, heat exchanger 3, heat pump 4, first control valve 5, pump 6, non-return valve 7, temporary heat exchanger 8, first regulating valve 9, second regulating valve 10. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below through specific implementation methods:

[0018] like Figure 1As shown, an embodiment of the utility model proposes a waste heat recovery and utilization system for pharmaceutical wastewater, which is arranged between the final settling tank 1 and the UASB anaerobic tank 2, and includes a normal recovery and utilization unit, and the normal recovery and utilization unit includes a heat pump unit and a heat exchanger 3; wherein a heat transfer medium circulates in the heat pump unit and the final settling tank 1 is connected to the heat pump unit to form a waste heat recovery circulation loop for exchanging heat with the heat transfer medium; the heat exchanger 3 is connected between the heat pump unit and the UASB anaerobic tank 2 to transfer the heat in the heat transfer medium to the pharmaceutical wastewater in the UASB anaerobic tank 2.

[0019] When the pharmaceutical wastewater treatment system is in operation, one of the key points to control the stable and efficient operation of the UASB anaerobic tank 2 is a medium temperature environment, and the water temperature is not less than 30 degrees Celsius; but when the ambient temperature is low, a heat source is needed to increase the temperature of the pharmaceutical wastewater in the UASB anaerobic tank 2. And about 4-6 months a year, additional steam is needed to heat the pharmaceutical wastewater in the UASB anaerobic tank 2. Here, the heat pump unit and the heat exchanger 3 are used to transfer the residual heat in the water treated in the final sedimentation tank 1 to the pharmaceutical wastewater in the UASB anaerobic tank 2, which can reduce the use of additional steam and greatly reduce the waste of potential energy.

[0020] Among them, the heat pump unit is used to transfer the waste heat in the low-temperature water discharged from the final sedimentation tank 1 to the high-temperature heat transfer medium in the heat pump unit. After the high-temperature heat transfer medium in the heat pump unit exchanges heat with the heat transfer medium in the heat exchanger 3, the heat transfer medium in the heat exchanger 3 exchanges heat with the pharmaceutical wastewater in the UASB anaerobic tank 2 to provide the required heat for the pharmaceutical wastewater in the UASB anaerobic tank 2.

[0021] In order to better understand this solution, the structure of the heat pump unit and other components will be further optimized.

[0022] like Figure 1 As shown, according to another embodiment of the utility model, a pharmaceutical wastewater waste heat recovery and utilization system, wherein the heat pump unit includes at least two heat pumps 4, the heat pumps 4 are connected to form a heat transfer medium circulation loop for circulating the heat transfer medium, and one of the heat pumps 4 is connected to the final settling tank 1, and another different heat pump 4 is connected to the heat exchanger 3.

[0023] In this embodiment:

[0024] There are two heat pumps 4 that can meet the usage requirements to circulate the heat transfer medium, thereby transferring the waste heat in the low-temperature water discharged from the final sedimentation tank 1 to the heat transfer medium in the heat exchanger 3 and then to the pharmaceutical wastewater in the UASB anaerobic tank 2.

[0025] The heat pump unit further comprises a first control valve 5 and a pump 6 connected in the heat transfer medium circulation loop. The pump 6 provides sufficient power for the heat transfer medium to flow in the heat transfer medium circulation loop, and the first control valve 5 controls the on-off of the heat transfer medium circulation loop.

[0026] like Figure 1 As shown, according to another embodiment of the utility model, a pharmaceutical wastewater waste heat recovery and utilization system is described, wherein a one-way valve 7 is also provided in the waste heat recovery circulation loop to ensure that the water treated in the final settling tank 1 enters the corresponding heat pump 4 for heat exchange and then returns to the final settling tank 1 without error in its flow direction.

[0027] like Figure 1 As shown, according to another embodiment of the utility model, a pharmaceutical wastewater waste heat recovery and utilization system, wherein the heat exchanger 3 is a plate heat exchanger, can change the heat exchange area by adjusting the number of plates to meet the heat exchange requirements.

[0028] The specific use of this embodiment is:

[0029] The temperature of the water taken out of the final sedimentation tank 1 is about 30°C. After heat exchange with the heat transfer medium in the heat pump 4, the temperature of the water returned to the final sedimentation tank 1 is about 22°C.

[0030] The heat transfer medium discharged from the plate heat exchanger at a temperature of about 50°C enters the heat pump 4 for heat exchange, and then returns to the plate heat exchanger at a temperature of about 75°C.

[0031] In the plate heat exchanger, the temperature of the pharmaceutical wastewater taken out of the UASB anaerobic tank 2 is about 12°C, and the temperature of the pharmaceutical wastewater returned to the UASB anaerobic tank 2 after heat exchange in the plate heat exchanger is about 35°C; to meet the heat required by the pharmaceutical wastewater in the UASB anaerobic tank 2 during the treatment process.

[0032] like Figure 2 As shown, according to another embodiment of the utility model, the pharmaceutical wastewater waste heat recovery and utilization system also includes a temporary heat exchange unit and a control unit; the temporary heat exchange unit includes a temporary heat exchanger 8 directly connected between the final settling tank 1 and the UASB anaerobic tank 2, and the control unit is connected to the normal recovery and utilization unit and the temporary heat exchange unit, and is used to control the start and stop of the normal recovery and utilization unit or the temporary heat exchange unit.

[0033] When the heat pump 4 or heat exchanger 3 in the normal recycling unit needs to be shut down due to maintenance or overhaul, the normal recycling unit can be disconnected through the control unit, and the temporary heat exchange unit can be activated to allow the water taken out of the final settling tank 1 to directly exchange heat with the pharmaceutical wastewater in the UASB anaerobic tank 2 in the temporary heat exchanger 8, thereby providing part of the heat for the operation of the pharmaceutical wastewater in the UASB anaerobic tank 2 and reducing heat loss.

[0034] Based on the above scheme:

[0035] The final settling tank 1 is connected to the heat pump unit through a first liquid inlet pipe and a first liquid return pipe, the UASB anaerobic tank 2 is connected to the heat exchanger 3 through a second liquid inlet pipe and a second liquid return pipe, the first liquid inlet pipe and the liquid inlet end of the first channel of the temporary heat exchanger 8 and the first liquid return pipe and the liquid outlet end of the first channel of the temporary heat exchanger 8 are connected through a first liquid guide pipe, the second liquid inlet pipe and the liquid inlet end of the second channel of the temporary heat exchanger 8 and the second liquid return pipe and the liquid outlet end of the second channel of the temporary heat exchanger 8 are connected through a second liquid guide pipe; the control unit includes a first regulating valve 9 arranged on the first liquid guide pipe and the second liquid guide pipe, and a second regulating valve 10 arranged on the first liquid inlet pipe, the first liquid return pipe, the second liquid inlet pipe and the second liquid return pipe, and the second regulating valve 10 is located between the heat pump unit and the corresponding first liquid guide pipe or between the heat exchanger 3 and the corresponding second liquid guide pipe.

[0036] When the normal recycling unit is activated, the second regulating valve 10 is opened and the first regulating valve 9 is closed; when the temporary heat exchange unit is activated, the first regulating valve 9 is opened and the second regulating valve 10 is closed; the adjustment is convenient and fast.

[0037] Wherein, the first regulating valve 9 and the second regulating valve 10 are both electric regulating valves and the control unit also includes a controller connected to the first regulating valve 9 and the second regulating valve 10; the first regulating valve 9 or the second regulating valve 10 is opened or closed more conveniently through the controller, and the controller can be a commonly used CPU controller.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pharmaceutical wastewater waste heat recovery system, arranged between the final sedimentation tank and the UASB anaerobic tank, characterized in that: A normal recycling unit is included, wherein the normal recycling unit includes: A heat pump unit, wherein a heat transfer medium circulates in the heat pump unit and the final settling tank is connected to the heat pump unit to form a waste heat recovery circulation loop for exchanging heat with the heat transfer medium; A heat exchanger is connected between the heat pump unit and the UASB anaerobic tank to transfer heat in the heat transfer medium to the pharmaceutical wastewater in the UASB anaerobic tank.

2. The pharmaceutical wastewater waste heat recovery system according to claim 1 is characterized in that: The heat pump unit includes at least two heat pumps, which are connected to form a heat transfer medium circulation loop for circulating the heat transfer medium, and one of the heat pumps is connected to the final settling tank, and another different heat pump is connected to the heat exchanger.

3. The pharmaceutical wastewater waste heat recovery system according to claim 2 is characterized in that: The heat pump unit also includes a first control valve and a pump connected in the heat transfer medium circulation loop.

4. The pharmaceutical wastewater waste heat recovery system according to claim 1 is characterized in that: A one-way valve is also provided in the waste heat recovery circulation loop.

5. The pharmaceutical wastewater waste heat recovery system according to claim 1 is characterized in that: The heat exchanger is a plate heat exchanger.

6. The pharmaceutical wastewater waste heat recovery system according to claim 1 is characterized in that: Also includes: A temporary heat exchange unit, the temporary heat exchange unit comprising a temporary heat exchanger directly connected between the final settling tank and the UASB anaerobic tank; And a control unit, which is connected to the normal recycling unit and the temporary heat exchange unit and is used to control the start and stop of the normal recycling unit or the temporary heat exchange unit.

7. The pharmaceutical wastewater waste heat recovery system according to claim 6 is characterized in that: The final settling tank is connected to the heat pump unit through a first liquid inlet pipe and a first liquid return pipe, the UASB anaerobic tank is connected to the heat exchanger through a second liquid inlet pipe and a second liquid return pipe, the first liquid inlet pipe and the liquid inlet end of the first channel of the temporary heat exchanger and the first liquid return pipe and the liquid outlet end of the first channel of the temporary heat exchanger are both connected through the first liquid guide pipe, the second liquid inlet pipe and the liquid inlet end of the second channel of the temporary heat exchanger and the second liquid return pipe and the liquid outlet end of the second channel of the temporary heat exchanger are both connected through the second liquid guide pipe; the control unit includes a first regulating valve arranged on the first liquid guide pipe and the second liquid guide pipe, and a second regulating valve arranged on the first liquid inlet pipe, the first liquid return pipe, the second liquid inlet pipe and the second liquid return pipe, and the second regulating valve is located between the heat pump unit and the corresponding first liquid guide pipe or between the heat exchanger and the corresponding second liquid guide pipe.

8. The pharmaceutical wastewater waste heat recovery system according to claim 7 is characterized in that: The first regulating valve and the second regulating valve are both electric regulating valves and the control unit further includes a controller connected to both the first regulating valve and the second regulating valve.

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