High-temperature heat source segmented cooling type absorption heat pump unit

Abstract

The utility model discloses a high-temperature heat source segmented cooling type absorption heat pump unit, and belongs to the technical field of heat exchange equipment. The heat pump is additionally provided with the warm water preheating recoverer, warm water adopts a parallel and series segmented heating process, and the warm water outlet temperature is increased; a high-temperature heat source is sequentially connected in series to pass through the regenerator, the solution preheating recoverer, the warm water preheating recoverer and the low-temperature heat source water preheating heat exchanger, so that stepped efficient utilization of the high-temperature heat source is realized, and meanwhile, the water inlet temperature of low-temperature heat source water is increased; a solution overheating recoverer is additionally arranged, overheating heat of a concentrated solution is recovered to heat a dilute solution, the flash evaporation amount of the concentrated solution is reduced, and waste heat recovery maximization is achieved; a U-shaped refrigerant water coil pipe is additionally arranged, so that the flash evaporation amount of refrigerant water in the evaporator is reduced, and the heat exchange efficiency is improved; a high-temperature heat source U-shaped coil pipe is additionally arranged, crystallization is prevented, and the use safety of the unit is improved; and by adopting multiple prevention and control means, PID control and load pre-judgment regulation and control, accurate regulation and control of the load are realized, and the operation of the unit is more stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange equipment, in particular to a high-temperature heat source segmented cooling type absorption heat pump unit. Background Art

[0002] The lithium bromide absorption heat pump unit uses thermal energy as the power, water as the refrigerant, and lithium bromide solution as the absorbent. It has the advantages of high energy efficiency, green environmental protection, safety and reliability, and easy maintenance. The application of lithium bromide absorption heat pumps in the field of heating is becoming more and more extensive, especially in the field of factory waste heat recovery and utilization. However, the low-temperature waste heat discharged by the factory production is expected to be recycled and utilized to the maximum extent, and more high-quality warm water can be produced. On the one hand, it can meet the cooling needs of low-temperature waste heat resources, and on the other hand, it can meet the high-temperature heating needs of the factory. At the same time, the complex and changeable conditions in the industrial system have a huge impact on the control system of the lithium bromide absorption heat pump unit. The structure, process and control technology of the conventional absorption heat pump are used, and the quality of the produced warm water cannot be greatly improved. How to improve the heat exchange efficiency of the heat pump unit and enable the absorption heat pump to operate efficiently and stably has become an urgent issue to be solved. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a high-temperature heat source segmented cooling absorption heat pump unit, the heat pump unit is additionally equipped with a warm water preheating recovery device, the warm water adopts a parallel and series segmented heating process, the warm water passes through the condenser and absorber in series, and the warm water passes through the warm water preheating recovery device in series to improve the outlet temperature of the warm water; a warm water preheating recovery device and a low-temperature heat source water preheating heat exchanger are additionally provided, the high-temperature heat source passes through the regenerator, the solution preheating recovery device, the warm water preheating recovery device, the low-temperature heat source water preheating heat exchanger in series in sequence The device realizes the high-efficiency utilization of high-temperature heat sources in stages. At the same time, the high-temperature heat source is used to preheat the low-temperature heat source water in the low-temperature heat source water preheating heat exchanger to increase the inlet temperature of the low-temperature heat source water; a solution superheat recovery device is added to adjust the flow of the dilute solution entering the solution superheat recovery device according to the superheat of the concentrated solution entering the absorber, recover the heat of the overheated concentrated solution to heat the dilute solution, reduce the flash volume of the concentrated solution in the absorber, increase the temperature of the dilute solution sent to the regenerator, and maximize the waste heat recovery; the absorber A refrigerant water U-coil is added inside the receiver cylinder. The refrigerant water condensed in the condenser enters the refrigerant water U-coil for heating the dilute solution stored in the lower part of the absorber. After the refrigerant water is cooled, it enters the evaporator, reducing the flash volume of the refrigerant water in the evaporator, reducing the internal heat exchange loss, improving the heat exchange efficiency of the unit, and avoiding energy waste; a high-temperature heat source U-coil is added to the concentrated solution pipeline connected to the outlet of the solution heat exchanger. When there is a tendency of crystallization, the concentrated solution outlet pipeline of the solution heat exchanger is heated by the high-temperature heat source in the high-temperature heat source U-coil. Crystallization will not occur in the unit under the most unfavorable working conditions, which improves the safety of the unit and avoids the unit's alarm shutdown or attenuation of heating capacity; the unit adopts multiple prevention and control measures, PID control and load pre-judgment and control. The unit responds quickly to sudden changes in load and has higher control accuracy. The high-temperature heat source control valve pre-judgments and controls in advance according to the calculation results of the PID calculation formula. The warm water outlet temperature and the high-temperature heat source consumption will quickly stabilize, solving the PID problem. Compared with traditional control methods, the automatic control tracking and correction deviation caused by inappropriate parameters can achieve precise load regulation. When external conditions change drastically, the control system responds more accurately and quickly, and the unit operation is more stable.

[0004] The utility model adopts the following technical scheme to achieve the above-mentioned purpose: a high-temperature heat source segmented cooling type absorption heat pump unit, characterized in that it includes an absorber, an evaporator, a regenerator, a condenser, a solution heat exchanger, a solution preheat recovery device, a warm water preheat recovery device, a dilute solution pump, a concentrated solution pump, a refrigerant pump, a solution superheat recovery device, and a low-temperature heat source water preheat heat exchanger, wherein the absorber and the evaporator are arranged in a cylinder, the regenerator and the condenser are arranged in a cylinder, the evaporator is respectively connected to the low-temperature heat source water inlet pipeline and the low-temperature heat source water outlet pipeline, and the low-temperature heat source water preheat heat exchanger is arranged on the low-temperature heat source water inlet pipeline; the absorber is respectively connected to the warm water pipeline A and the warm water pipeline B, The condenser is connected to the warm water pipeline B and the warm water inlet pipeline respectively, the absorber and the condenser are connected through the warm water pipeline B, the warm water preheat recovery device is arranged on the warm water pipeline C, the warm water pipeline A and the warm water pipeline C merge to connect the warm water outlet pipeline, the water inlet end of the warm water pipeline C is connected to the warm water inlet pipeline, the warm water adopts a parallel and series segmented heating process, the warm water passes through the warm water pipeline A and the warm water pipeline C in parallel, one way passes through the condenser and the absorber in series, and the other way passes through the warm water preheat recovery device. After the two ways of warm water converge, they flow out of the unit through the warm water outlet pipeline; the regenerator is connected to the high-temperature heat source inlet pipeline and the high-temperature heat source pipeline A respectively, and the regenerator and the solution preheat recovery device are connected through the high-temperature heat source pipeline A. The solution preheat recovery device and the warm water preheat recovery device are connected through the high-temperature heat source pipeline B, the warm water preheat recovery device and the low-temperature heat source water preheat heat exchanger are connected through the high-temperature heat source pipeline C, and the low-temperature heat source water preheat heat exchanger is provided with a high-temperature heat source outlet pipeline. The high-temperature heat source adopts a segmented cooling process. The high-temperature heat source is sequentially connected in series through the regenerator, the solution preheat recovery device, the warm water preheat recovery device, and the low-temperature heat source water preheat heat exchanger; a dilute solution pump is arranged below the absorber and the evaporator cylinder, and a dilute solution pipeline B and a dilute solution pipeline D are arranged in parallel on the dilute solution pipeline A connected to the outlet of the dilute solution pump, a solution heat exchanger is arranged on the dilute solution pipeline B, and the end of the dilute solution pipeline B is connected to the solution preheat recovery device. The dilute solution pipeline D is connected to the solution superheat recovery device, the dilute solution pipeline C connected to the solution preheat recovery device and the dilute solution pipeline E connected to the solution superheat recovery device are merged and connected to the dilute solution pipeline F, the end of the dilute solution pipeline F is connected to the regenerator, the regenerator is connected to the solution heat exchanger through the concentrated solution pipeline A, the concentrated solution pipeline A is provided with a concentrated solution pump, the solution heat exchanger is connected to the solution superheat recovery device through the concentrated solution pipeline B, and the solution superheat recovery device is connected to the absorber through the concentrated solution pipeline C; a refrigerant pump is provided on the refrigerant water pipeline below the absorber and the evaporator cylinder, a refrigerant water U-shaped coil is provided inside the absorber cylinder, the water inlet end of the refrigerant water U-shaped coil is connected to the condenser, and the end of the refrigerant water U-shaped coil is connected to the evaporator.

[0005] A high-temperature heat source U-shaped coil is arranged on the concentrated liquid pipeline B, the inlet end of the high-temperature heat source U-shaped coil is connected to the high-temperature heat source pipeline A, the outlet end of the high-temperature heat source U-shaped coil is connected to the high-temperature heat source pipeline B, and a high-temperature heat source flow regulating valve is arranged on the inlet end pipeline of the high-temperature heat source U-shaped coil.

[0006] A high-temperature heat source control valve is arranged on the high-temperature heat source inlet pipeline, a warm water flow regulating valve is arranged on the warm water pipeline C, and a dilute solution flow regulating valve is arranged on the dilute solution pipeline E.

[0007] A regenerator temperature sensor is arranged on the concentrated solution pipeline A, a condensing temperature sensor is arranged on the water inlet connecting pipeline of the refrigerant water U-shaped coil, a dilute solution temperature sensor A is arranged on the dilute solution pipeline A, a dilute solution temperature sensor B is arranged on the dilute solution pipeline B, a concentrated solution temperature sensor is arranged on the concentrated solution pipeline B, an absorber temperature sensor is arranged on the absorber, a low-temperature heat source water outlet temperature sensor is arranged on the low-temperature heat source water outlet pipeline, a warm water outlet temperature sensor is arranged on the warm water outlet pipeline, a warm water inlet temperature sensor is arranged on the warm water inlet pipeline, a high-temperature heat source outlet temperature sensor is arranged on the high-temperature heat source outlet pipeline, and a refrigerant temperature sensor is arranged on the refrigerant water pipeline. The unit is also equipped with a control system, preferably a PLC control system.

[0008] The beneficial effects of the utility model are:

[0009] 1. Add a warm water preheating recovery device, and the warm water adopts a parallel and series segmented heating process. The warm water passes through the condenser and absorber in series, and the warm water passes through the warm water preheating recovery device. The two warm water flows out of the unit after converging, realizing the segmented heating of the warm water, increasing the outlet temperature of the warm water, and improving the heat exchange efficiency of the unit.

[0010] 2. Add warm water preheat recovery device and low-temperature heat source water preheat heat exchanger. The high-temperature heat source adopts a segmented cooling process. The high-temperature heat source is connected in series through the regenerator, solution preheat recovery device, warm water preheat recovery device, and low-temperature heat source water preheat heat exchanger in sequence, realizing the cascade and efficient utilization of the high-temperature heat source. At the same time, the high-temperature heat source is used to preheat the low-temperature heat source water in the low-temperature heat source water preheat heat exchanger to increase the inlet temperature of the low-temperature heat source water, thereby improving the heat exchange efficiency of the unit and avoiding energy waste.

[0011] 3. Add a solution superheat recovery device. According to the superheat of the concentrated solution entering the absorber, adjust the flow of the dilute solution entering the solution superheat recovery device, recover the superheated heat of the concentrated solution to heat the dilute solution, reduce the flash volume of the concentrated solution in the absorber, increase the temperature of the dilute solution sent to the regenerator, maximize the waste heat recovery, reduce the internal heat exchange loss, improve the heat exchange efficiency of the unit, and avoid energy waste.

[0012] 4. A refrigerant water U-shaped coil is added inside the absorber cylinder. The refrigerant water condensed in the condenser enters the refrigerant water U-shaped coil to heat the dilute solution stored in the lower part of the absorber. The refrigerant water cools down and enters the evaporator, reducing the flash amount of the refrigerant water in the evaporator, reducing the internal heat exchange loss, and improving the heat exchange efficiency of the unit.

[0013] 5. A high-temperature heat source U-shaped coil is added to the concentrated solution pipeline B connected to the outlet of the solution heat exchanger. When the concentrated solution pipeline B has a tendency to crystallize, the concentrated solution outlet pipeline of the solution heat exchanger is heated by the high-temperature heat source in the high-temperature heat source U-shaped coil. Crystallization will not occur in the unit even under the most unfavorable operating conditions, thereby improving the safety of the unit and avoiding alarm shutdown of the unit or attenuation of heating capacity.

[0014] 6. The unit adopts multiple prevention and control measures, PID control and load prediction and control. The unit responds quickly to sudden changes in load and has higher control accuracy. The high-temperature heat source control valve predicts and controls in advance according to the calculation results of the PID operation formula. The warm water outlet temperature and high-temperature heat source consumption will quickly tend to stabilize, solving the problem of excessive deviation in automatic control tracking correction caused by inappropriate PID parameters. Compared with traditional control methods, it realizes precise load control. When external conditions change drastically, the control system responds more accurately and quickly, and the unit runs more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a high-temperature heat source segmented cooling absorption heat pump unit of the utility model;

[0016] In the figure: 1-absorber, 2-evaporator, 3-regenerator, 4-condenser, 5-solution heat exchanger, 6-solution preheat recovery device, 7-warm water preheat recovery device, 8-dilute solution pump, 9-concentrated solution pump, 10-refrigerant pump, 11-solution superheat recovery device, 12-low-temperature heat source water inlet pipeline, 13-low-temperature heat source water outlet pipeline, 14-warm water outlet pipeline, 15-warm water pipeline A, 16-warm water pipeline B, 17-warm water pipeline C, 18-warm water inlet pipeline, 19-high-temperature heat source inlet pipeline, 20-high-temperature heat source pipeline A, 21-high-temperature heat source pipeline B, 22-high-temperature heat source pipeline C, 23-high-temperature heat source outlet pipeline, 24-dilute solution pipeline A, 25-dilute solution pipeline B, 26-dilute solution pipeline C, 27-dilute solution pipeline D, 28-dilute solution pipeline E, 2 9-dilute solution pipeline F, 30-concentrated solution pipeline A, 31-concentrated solution pipeline B, 32-concentrated solution pipeline C, 33-high-temperature heat source U-shaped coil, 34-refrigerant water U-shaped coil, 35-refrigerant water pipeline, 36-high-temperature heat source control valve, 37-warm water flow regulating valve, 38-high-temperature heat source flow regulating valve, 39-dilute solution flow regulating valve, 40-regenerator temperature sensor, 41-condensing temperature sensor, 42-dilute solution temperature sensor A, 43-dilute solution temperature sensor B, 44-concentrated solution temperature sensor, 45-absorber temperature sensor, 46-low-temperature heat source water outlet temperature sensor, 47-warm water outlet temperature sensor, 48-warm water inlet temperature sensor, 49-high-temperature heat source outlet temperature sensor, 50-refrigerant temperature sensor, 51-low-temperature heat source water preheating heat exchanger. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0018] Example 1

[0019] like Figure 1A high-temperature heat source segmented cooling absorption heat pump unit shown in the figure includes an absorber 1, an evaporator 2, a regenerator 3, a condenser 4, a solution heat exchanger 5, a solution preheat recovery device 6, a warm water preheat recovery device 7, a dilute solution pump 8, a concentrated solution pump 9, a refrigerant pump 10, a solution superheat recovery device 11, and a low-temperature heat source water preheat heat exchanger 51, wherein the absorber 1 and the evaporator 2 are arranged in a cylinder, the regenerator 3 and the condenser 4 are arranged in a cylinder, the evaporator 2 is respectively connected to a low-temperature heat source water inlet pipeline 12 and a low-temperature heat source water outlet pipeline 13, and a low-temperature heat source water preheat heat exchanger 51 is arranged on the low-temperature heat source water inlet pipeline 12; the absorber 1 is respectively connected to a warm water pipeline A 15 and a warm water pipeline B 16, the condenser 4 is respectively connected to a warm water pipeline B16 and a warm water inlet pipeline 18, the absorber 1 and the condenser 4 are connected through a warm water pipeline B 16, and the warm water preheat recovery device 7 is arranged on the warm water pipeline C 17, the converging pipeline of the warm water pipeline A 15 and the warm water pipeline C 17 is connected to the warm water outlet pipeline 14, and the water inlet end of the warm water pipeline C 17 is connected to the warm water inlet pipeline 18. The warm water adopts a parallel and series segmented heating process. The warm water passes through the warm water pipeline A 15 and the warm water pipeline C 17 in parallel, one way passes through the condenser 4 and the absorber 1 in series, and the other way passes through the warm water preheating recovery device 7. After the two ways of warm water converge, they flow out of the unit through the warm water outlet pipeline 14, realizing the segmented heating of the warm water, improving the outlet temperature of the warm water, and improving the heat exchange efficiency of the unit; the regenerator 3 is respectively connected to the high-temperature heat source inlet pipeline 19 and the high-temperature heat source pipeline A 20, the regenerator 3 and the solution preheating recovery device 6 are connected through the high-temperature heat source pipeline A 20, and the solution preheating recovery device 6 and the warm water preheating recovery device 7 are connected through the high-temperature heat source pipeline B 21 is connected, the warm water preheat recovery device 7 and the low-temperature heat source water preheat heat exchanger 51 are connected through a high-temperature heat source pipeline C 22, a high-temperature heat source outlet pipeline 23 is provided on the low-temperature heat source water preheat heat exchanger 51, and the high-temperature heat source adopts a segmented cooling process. The high-temperature heat source is sequentially connected in series through the regenerator 3, the solution preheat recovery device 6, the warm water preheat recovery device 7, and the low-temperature heat source water preheat heat exchanger 51. The high-temperature heat source heats the dilute solution in the regenerator 3 for the first cooling and then enters the solution preheat recovery device 6. The high-temperature heat source preheats the dilute solution in the solution preheat recovery device 6 for the second cooling and then enters the warm water preheat recovery device 7. The high-temperature heat source is in the warm water preheat recovery device The heated water in 7 is cooled for the third time and then enters the low-temperature heat source water preheating heat exchanger 51. The high-temperature heat source preheats the low-temperature heat source water in the low-temperature heat source water preheating heat exchanger 51 for the fourth cooling. The high-temperature heat source finally flows out of the unit through the high-temperature heat source outlet pipeline 23. The high-temperature heat source is cooled in stages to achieve high-efficiency step-by-step utilization of the high-temperature heat source. At the same time, the high-temperature heat source is used to preheat the low-temperature heat source water in the low-temperature heat source water preheating heat exchanger 51 to increase the inlet temperature of the low-temperature heat source water, thereby improving the heat exchange efficiency of the unit and avoiding energy waste.A dilute solution pump 8 is arranged below the cylinder of the absorber 1 and the evaporator 2. A dilute solution pipeline B 25 and a dilute solution pipeline D 27 are arranged in parallel on a dilute solution pipeline A 24 connected to the outlet of the dilute solution pump 8. A solution heat exchanger 5 is arranged on the dilute solution pipeline B 25. The end of the dilute solution pipeline B 25 is connected to a solution preheat recovery device 6. The dilute solution pipeline D 27 is connected to a solution superheat recovery device 11. The dilute solution pipeline C 26 connected to the solution preheat recovery device 6 and the dilute solution pipeline E 28 connected to the solution superheat recovery device 11 are merged and connected to a dilute solution pipeline F 29. The end of the dilute solution pipeline F 29 is connected to the regenerator 3. The regenerator 3 is connected to the solution heat exchanger 5 through a concentrated solution pipeline A 30. A concentrated solution pump 9 is arranged on the concentrated solution pipeline A 30. The solution heat exchanger 5 is connected to the solution superheat recovery device 11 through a concentrated solution pipeline B 31. The solution superheat recovery device 11 is connected to the concentrated solution pipeline C 26 through a concentrated solution pipeline E 28. 32 is connected to the absorber 1, and a solution superheat recovery device 11 is set. According to the superheat of the concentrated solution entering the absorber 1, the flow of the dilute solution entering the solution superheat recovery device 11 is adjusted, the heat of the concentrated solution superheat is recovered to heat the dilute solution, the flash amount of the concentrated solution in the absorber 1 is reduced, and the temperature of the dilute solution sent to the regenerator 3 is increased, so as to maximize the waste heat recovery, reduce the internal heat exchange loss, improve the heat exchange efficiency of the unit, and avoid energy waste;A refrigerant pump 10 is arranged on the refrigerant water pipeline 35 below the cylinders of the absorber 1 and the evaporator 2, a refrigerant water U-shaped coil 34 is arranged inside the cylinder of the absorber 1, the water inlet end of the refrigerant water U-shaped coil 34 is connected to the condenser 4, and the end of the refrigerant water U-shaped coil 34 is connected to the evaporator 2. The absorber 1, the regenerator 3, the solution heat exchanger 5, the solution preheat recovery device 6, the dilute solution pump 8, the concentrated solution pump 9, and the solution superheat recovery device 11 form a solution cycle, and the evaporator 2, the condenser 4, and the refrigerant pump 10 form a refrigerant cycle, that is, the dilute solution from the absorber 1 is sent to the dilute solution pipeline A 24 through the dilute solution pump 8 and then divided into two paths, one path passes through the dilute solution pipeline B 25 and passes through the solution heat exchanger 5 and the solution preheat recovery device 6 in sequence, and the other path passes through the dilute solution pipeline D 27 and passes through the solution superheat recovery device 11. After the dilute solutions converge, they enter the regenerator 3 through the dilute solution pipeline F 29. The dilute solution in the regenerator 3 is heated and concentrated by the high-temperature heat source to form a concentrated solution. The refrigerant vapor formed by the concentrated solution is condensed in the condenser 4 to form refrigerant water. The concentrated solution is sent to the solution heat exchanger 5 and the solution superheat recovery device 11 in sequence through the concentrated solution pump 9. After the heat exchange, the temperature is reduced and the concentrated solution is sent to the concentrated solution pipeline C 29. 32 returns to the absorber 1, the concentrated solution absorbs the refrigerant vapor from the evaporator 2 in the absorber 1 and becomes a dilute solution. At the same time, by setting the refrigerant water U-shaped coil 34, the refrigerant water condensed in the condenser 4 enters the refrigerant water U-shaped coil 34 to heat the dilute solution stored in the lower part of the absorber 1. The refrigerant water enters the evaporator 2 after cooling, reducing the flash amount of the refrigerant water in the evaporator 2, reducing the internal heat exchange loss, and improving the heat exchange efficiency of the unit. The refrigerant water is sent to the heat transfer pipe of the evaporator 2 by the refrigerant pump 10 to drip, recovering the heat of the low-temperature heat source water entering the evaporator 2. ;

[0020] A high-temperature heat source U-shaped coil 33 is arranged on the concentrated solution pipeline B 31, the inlet end of the high-temperature heat source U-shaped coil 33 is connected to the high-temperature heat source pipeline A 20, and the outlet end of the high-temperature heat source U-shaped coil 33 is connected to the high-temperature heat source pipeline B 21. A high-temperature heat source flow regulating valve 38 is arranged on the inlet end pipeline of the high-temperature heat source U-shaped coil 33. When the concentrated solution pipeline B 31 has a tendency to crystallize, the concentrated solution outlet pipeline of the solution heat exchanger 5 is heated in the high-temperature heat source U-shaped coil 33 by the high-temperature heat source to prevent crystallization, thereby ensuring the normal operation of the heat pump unit and avoiding the unit alarm shutdown or attenuation of the heating capacity.

[0021] A high-temperature heat source control valve 36 is provided on the high-temperature heat source inlet pipeline 19, a warm water flow regulating valve 37 is provided on the warm water pipeline C 17, and a dilute solution flow regulating valve 39 is provided on the dilute solution pipeline E 28.

[0022] A regenerator temperature sensor 40 is provided on the concentrated solution pipeline A 30, a condensing temperature sensor 41 is provided on the water inlet connecting pipeline of the refrigerant water U-shaped coil 34, a dilute solution temperature sensor A 42 is provided on the dilute solution pipeline A 24, a dilute solution temperature sensor B 43 is provided on the dilute solution pipeline B 25, a concentrated solution temperature sensor 44 is provided on the concentrated solution pipeline B 31, an absorber temperature sensor 45 is provided on the absorber 1, a low-temperature heat source water outlet temperature sensor 46 is provided on the low-temperature heat source water outlet pipeline 13, a warm water outlet temperature sensor 47 is provided on the warm water outlet pipeline 14, a warm water inlet temperature sensor 48 is provided on the warm water inlet pipeline 18, a high-temperature heat source outlet temperature sensor 49 is provided on the high-temperature heat source outlet pipeline 23, and a refrigerant temperature sensor 50 is provided on the refrigerant water pipeline 35.

[0023] The unit is also equipped with a control system, preferably a PLC control system. The high-temperature heat source control valve 36, the warm water flow regulating valve 37, the high-temperature heat source flow regulating valve 38, the dilute solution flow regulating valve 39, the regenerator temperature sensor 40, the condensing temperature sensor 41, the dilute solution temperature sensor A 42, the dilute solution temperature sensor B 43, the concentrated solution temperature sensor 44, the absorber temperature sensor 45, the low-temperature heat source water outlet temperature sensor 46, the warm water outlet temperature sensor 47, the warm water inlet temperature sensor 48, the high-temperature heat source outlet temperature sensor 49, and the refrigerant temperature sensor 50 are respectively connected to the PLC control system, and the specific model is not limited, as long as their working functions are realized. Example

[0024] The method for controlling the high-temperature heat source outlet temperature of the heat pump unit described in Application Example 1 is as follows: a warm water flow regulating valve 37 is used to regulate and control the flow of warm water entering the warm water preheating recovery device 7. When the high-temperature heat source outlet temperature detected by the high-temperature heat source outlet temperature sensor 49 is lower than the first set temperature of the high-temperature heat source, the opening of the warm water flow regulating valve 37 is reduced. When the high-temperature heat source outlet temperature detected by the high-temperature heat source outlet temperature sensor 49 is higher than the second set temperature of the high-temperature heat source, the opening of the warm water flow regulating valve 37 is increased. The warm water flow regulating valve 37 is regulated and controlled according to the actual operating parameters of the unit. By optimally adjusting the warm water flow entering the warm water preheating recovery device 7, high-efficiency step-by-step utilization of the high-temperature heat source is achieved, the heat exchange efficiency of the unit is improved, and energy waste is avoided.

[0025] The method for controlling the superheat of the concentrated solution of the heat pump unit described in Application Example 1 is as follows: the flow of the dilute solution entering the solution superheat recovery device 11 is regulated and controlled by the dilute solution flow regulating valve 39. When the temperature difference between the concentrated solution temperature detected by the concentrated solution temperature sensor 44 and the concentrated solution saturation temperature detected by the absorber temperature sensor 45 is lower than the first set temperature of the concentrated solution, the opening of the dilute solution flow regulating valve 39 is reduced. When the temperature difference between the concentrated solution temperature detected by the concentrated solution temperature sensor 44 and the concentrated solution saturation temperature detected by the absorber temperature sensor 45 is higher than the second set temperature of the concentrated solution, the opening of the dilute solution flow regulating valve 39 is increased. The dilute solution flow regulating valve 39 is regulated and controlled according to the superheat of the concentrated solution entering the absorber 1. By optimally adjusting the flow of the dilute solution entering the solution superheat recovery device 11, the heat of the superheated concentrated solution is effectively recovered to heat the dilute solution, the flash amount of the concentrated solution in the absorber 1 is reduced, and the temperature of the dilute solution sent to the regenerator 3 is increased, so as to maximize the recovery of waste heat, reduce internal heat exchange losses, improve the heat exchange efficiency of the unit, and avoid energy waste.

[0026] The anti-crystallization control method of the heat pump unit described in Application Example 1 is as follows: the high-temperature heat source flow regulating valve 38 is used to regulate and control the flow of the high-temperature heat source entering the high-temperature heat source U-shaped coil 33. When the temperature difference between the dilute solution temperature detected by the dilute solution temperature sensor B 43 and the dilute solution temperature detected by the dilute solution temperature sensor A 42 is lower than the first set temperature of the dilute solution, the opening of the high-temperature heat source flow regulating valve 38 is increased. When the temperature difference between the dilute solution temperature detected by the dilute solution temperature sensor B 43 and the dilute solution temperature detected by the dilute solution temperature sensor A 42 is lower than the first set temperature of the dilute solution, the opening of the high-temperature heat source flow regulating valve 38 is increased. When the temperature difference of the dilute solution temperature detected by the regenerator temperature sensor 40 and the condensing temperature sensor 41 is higher than the second set temperature of the dilute solution, the opening of the high-temperature heat source flow regulating valve 38 is reduced, and the concentrated solution concentration is calculated according to the temperatures detected by the regenerator temperature sensor 40 and the condensing temperature sensor 41, and then the corresponding crystallization temperature is calculated according to the concentrated solution concentration and the concentrated solution temperature detected by the concentrated solution temperature sensor 44. When the temperature difference between the concentrated solution temperature detected by the concentrated solution temperature sensor 44 and the calculated crystallization temperature is lower than the third set temperature of the concentrated solution, the opening of the high-temperature heat source flow regulating valve 38 is increased. When the temperature difference between the concentrated solution temperature detected by the concentrated solution temperature sensor 44 and the calculated crystallization temperature is higher than the fourth set temperature of the concentrated solution, the opening of the high-temperature heat source flow regulating valve 38 is reduced. The high-temperature heat source flow regulating valve 38 is adjusted and controlled according to the actual operating parameters of the unit. By optimally adjusting the high-temperature heat source flow entering the high-temperature heat source U-shaped coil 33, when the concentrated solution pipeline B When there is a tendency for crystallization, the concentrated solution outlet pipeline of the solution heat exchanger 5 is heated by the high-temperature heat source in the high-temperature heat source U-shaped coil 33, and crystallization will not occur in the unit even under the most unfavorable working conditions, thereby improving the safety of the unit and avoiding alarm shutdown of the unit or attenuation of heating capacity.

[0027] The method for accurately regulating and controlling the load of the heat pump unit described in Application Example 1 is as follows: the low-temperature heat source water outlet temperature sensor 46 and the refrigerant temperature sensor 50 are used to detect the low-temperature heat source water outlet temperature and the refrigerant temperature of the heat pump respectively, and the high-temperature heat source control valve 36 performs PID regulation control according to the detected low-temperature heat source water outlet temperature and the refrigerant temperature. The unit controls the opening of the high-temperature heat source control valve 36 in real time according to the comparison between the low-temperature heat source water outlet temperature detected by the low-temperature heat source water outlet temperature sensor 46 and the low-temperature heat source water outlet set temperature, and the comparison between the refrigerant temperature detected by the refrigerant temperature sensor 50 and the refrigerant outlet set temperature, so as to achieve stable operation of the unit and prevent the low-temperature heat source water outlet temperature of the heat pump from exceeding the set temperature. The low temperature will affect the production, and low temperature protection is realized; the warm water inlet temperature and the warm water outlet temperature of the heat pump are detected by the warm water inlet temperature sensor 48 and the warm water outlet temperature sensor 47, and the high temperature heat source control valve 36 performs PID adjustment control according to the detected warm water inlet temperature and the warm water outlet temperature. The unit controls the opening of the high temperature heat source control valve 36 in real time according to the comparison between the warm water inlet temperature detected by the warm water inlet temperature sensor 48 and the warm water inlet set temperature, and the comparison between the warm water outlet temperature detected by the warm water outlet temperature sensor 47 and the warm water outlet set temperature, so as to realize the stable operation of the unit and prevent the high temperature heat source of the heat pump from being over-input, causing the abnormal alarm and shutdown of the unit due to high temperature or high pressure, and realize High temperature protection is realized; the concentration of the concentrated solution is calculated according to the temperature detected by the regenerator temperature sensor 40 and the condensing temperature sensor 41. When the calculated concentration of the concentrated solution is higher than the first set concentration, the opening of the high-temperature heat source control valve 36 is reduced. When the calculated concentration of the concentrated solution is higher than the second set concentration, the high-temperature heat source control valve 36 is closed to prevent the excessive input of the high-temperature heat source of the unit, which causes the high concentration abnormal alarm shutdown of the unit, thereby realizing the high concentration protection of the unit; the unit adopts multiple prevention and control measures, PID control and load pre-judgment and control. The unit reacts quickly to the sudden change of load and has higher control accuracy. When the low-temperature heat source water outlet temperature sensor 46 detects the low-temperature heat source water outlet temperature , the refrigerant temperature detected by the refrigerant temperature sensor 50, the warm water outlet temperature detected by the warm water outlet temperature sensor 47, the warm water inlet temperature detected by the warm water inlet temperature sensor 48, and when the concentration of the concentrated solution is calculated based on the temperatures detected by the regenerator temperature sensor 40 and the condensing temperature sensor 41, the high-temperature heat source control valve 36 responds quickly and predicts in advance. The control system collects the low-temperature heat source water outlet temperature, the refrigerant temperature, the warm water outlet temperature, the warm water inlet temperature, the regenerator temperature, and the condensing temperature. The high-temperature heat source control valve 36 predicts and controls in advance according to the calculation results of the PID operation formula. The warm water outlet temperature and the high-temperature heat source consumption will quickly tend to stabilize, which solves the problem of excessive deviation of automatic control tracking correction caused by inappropriate PID parameters. Compared with traditional control methods, it realizes precise control of the load. When the external conditions change drastically, the control system reacts more accurately and quickly, and the unit runs more stably.

[0028] The above-mentioned embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made to the present invention without departing from the principle and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A high-temperature heat source staged cooling absorption heat pump unit, characterized in that: The invention comprises an absorber (1), an evaporator (2), a regenerator (3), a condenser (4), a solution heat exchanger (5), a solution preheat recovery device (6), a warm water preheat recovery device (7), a dilute solution pump (8), a concentrated solution pump (9), a refrigerant pump (10), a solution superheat recovery device (11), and a low-temperature heat source water preheat heat exchanger (51), wherein the absorber (1) and the evaporator (2) are arranged in a cylinder, the regenerator (3) and the condenser (4) are arranged in a cylinder, and the evaporator (2 ) are respectively connected to the low-temperature heat source water inlet pipeline (12) and the low-temperature heat source water outlet pipeline (13), and a low-temperature heat source water preheating heat exchanger (51) is arranged on the low-temperature heat source water inlet pipeline (12); the absorber (1) is respectively connected to the warm water pipeline A (15) and the warm water pipeline B (16), and the condenser (4) is respectively connected to the warm water pipeline B (16) and the warm water inlet pipeline (18); the absorber (1) and the condenser (4) are connected via the warm water pipeline B (16), and the warm water preheating recovery device (7) is arranged on the warm water pipeline C (17), the warm water pipeline A (15) and the warm water pipeline C (17) merge into a pipeline connected to the warm water outlet pipeline (14), and the water inlet end of the warm water pipeline C (17) is connected to the warm water inlet pipeline (18); the regenerator (3) is connected to the high-temperature heat source inlet pipeline (19) and the high-temperature heat source pipeline A (20) respectively, the regenerator (3) and the solution preheat recovery device (6) are connected via the high-temperature heat source pipeline A (20), and the solution preheat recovery device (6) and the warm water preheat recovery device (6) are connected to each other. The heat recovery devices (7) are connected via a high-temperature heat source pipeline B (21), the warm water preheating recovery device (7) and the low-temperature heat source water preheating heat exchanger (51) are connected via a high-temperature heat source pipeline C (22), a high-temperature heat source outlet pipeline (23) is provided on the low-temperature heat source water preheating heat exchanger (51), and the high-temperature heat source adopts a staged cooling process, and the high-temperature heat source is sequentially connected in series through the regenerator (3), the solution preheating recovery device (6), the warm water preheating recovery device (7), and the low-temperature heat source water preheating heat exchanger (51);A dilute solution pump (8) is arranged below the cylinder of the absorber (1) and the evaporator (2). A dilute solution pipeline B (25) and a dilute solution pipeline D (27) are arranged in parallel on a dilute solution pipeline A (24) connected to the outlet of the dilute solution pump (8). A solution heat exchanger (5) is arranged on the dilute solution pipeline B (25). The end of the dilute solution pipeline B (25) is connected to a solution preheat recovery device (6). The dilute solution pipeline D (27) is connected to a solution superheat recovery device (11). The dilute solution pipeline C (26) connected to the solution preheat recovery device (6) and the dilute solution pipeline E (28) connected to the solution superheat recovery device (11) are connected to a dilute solution pipeline F (29) after merging. The end of the dilute solution pipeline F (29) is connected to A regenerator (3), the regenerator (3) is connected to a solution heat exchanger (5) via a concentrated solution pipeline A (30), a concentrated solution pump (9) is provided on the concentrated solution pipeline A (30), the solution heat exchanger (5) is connected to a solution superheat recovery device (11) via a concentrated solution pipeline B (31), and the solution superheat recovery device (11) is connected to an absorber (1) via a concentrated solution pipeline C (32); a refrigerant pump (10) is provided on a refrigerant water pipeline (35) below the cylinders of the absorber (1) and the evaporator (2), a refrigerant water U-shaped coil (34) is provided inside the cylinder of the absorber (1), a water inlet end of the refrigerant water U-shaped coil (34) is connected to a condenser (4), and a terminal end of the refrigerant water U-shaped coil (34) is connected to the evaporator (2). ; 2. A high-temperature heat source staged cooling absorption heat pump unit according to claim 1, characterized in that: A high-temperature heat source U-shaped coil (33) is arranged on the concentrated liquid pipeline B (31), the inlet end of the high-temperature heat source U-shaped coil (33) is connected to the high-temperature heat source pipeline A (20), the outlet end of the high-temperature heat source U-shaped coil (33) is connected to the high-temperature heat source pipeline B (21), and a high-temperature heat source flow regulating valve (38) is arranged on the inlet end pipeline of the high-temperature heat source U-shaped coil (33).

3. A high-temperature heat source staged cooling absorption heat pump unit according to claim 1, characterized in that: A high-temperature heat source control valve (36) is provided on the high-temperature heat source inlet pipeline (19), a warm water flow regulating valve (37) is provided on the warm water pipeline C (17), and a dilute solution flow regulating valve (39) is provided on the dilute solution pipeline E (28).

4. A high-temperature heat source staged cooling absorption heat pump unit according to claim 1, characterized in that: A regenerator temperature sensor (40) is provided on the concentrated solution pipeline A (30), a condensing temperature sensor (41) is provided on the water inlet connecting pipeline of the refrigerant water U-shaped coil (34), a dilute solution temperature sensor A (42) is provided on the dilute solution pipeline A (24), a dilute solution temperature sensor B (43) is provided on the dilute solution pipeline B (25), a concentrated solution temperature sensor (44) is provided on the concentrated solution pipeline B (31), an absorber temperature sensor (45) is provided on the absorber (1), a low-temperature heat source water outlet temperature sensor (46) is provided on the low-temperature heat source water outlet pipeline (13), a warm water outlet temperature sensor (47) is provided on the warm water outlet pipeline (14), a warm water inlet temperature sensor (48) is provided on the warm water inlet pipeline (18), a high-temperature heat source outlet temperature sensor (49) is provided on the high-temperature heat source outlet pipeline (23), and a refrigerant temperature sensor (50) is provided on the refrigerant water pipeline (35). The unit is also equipped with a control system.

5. A high-temperature heat source staged cooling absorption heat pump unit according to claim 4, characterized in that: The control system is a PLC control system.

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