Energy-saving heat pump

Abstract

The utility model relates to an energy-saving heat pump, and relates to the technical field of heat pump units, the energy-saving heat pump comprises a multi-effect evaporation concentration system and a heat pump steam generation system, the heat pump steam generation system comprises a live steam heating module, a live steam separator and a subcooler, and a first live steam pipeline is arranged between the live steam heating module and the live steam separator in a communicating mode; the multi-effect evaporation and concentration system comprises a first-effect evaporator, a last-effect separator and a preheating heat exchanger; a second live steam pipeline is arranged between the live steam separator and the first-effect evaporator in a communicating manner; the live steam heating module is communicated with the subcooler, a first recycling pipeline is arranged between the last-effect separator and the preheating heat exchanger in a communicating mode, a first raw material pipeline and a second raw material pipeline are arranged on the preheating heat exchanger in a communicating mode, the feeding end of the first raw material pipeline is communicated with a feeding mechanism in a factory area, and the discharging end of the first raw material pipeline is communicated with the preheating heat exchanger; the feeding end of the second raw material pipeline communicates with the preheating heat exchanger, and the discharging end of the second raw material pipeline communicates with the subcooler.

Description

Technical Field

[0001] This application relates to the field of heat pump unit technology, and in particular to an energy-saving heat pump. Background Technology

[0002] Evaporation is a widely used process in the production of liquid materials. However, evaporation is energy-intensive, and to reduce energy consumption, common technologies such as multi-effect evaporation (MVR) and multi-effect evaporation are typically employed. For the concentration of heat-sensitive materials, multi-effect evaporation is generally used, and to further reduce energy consumption, TVR technology is often combined to recover a portion of the secondary steam generated during the first-effect evaporation.

[0003] Reference Figure 1 This is a schematic diagram of a common double-effect TVR evaporation and concentration process in existing technology. It mainly includes a first-effect evaporator: 100, a second-effect evaporator: 200, a first-stage separator: 300, a second-stage separator: 400, a condenser: 500, and a vacuum pump: 600. During the operation of the double-effect TVR evaporation system, live steam passes through the first-effect evaporator: 100, and the resulting secondary steam enters the second-effect evaporator: 200 as heating steam. The secondary steam flowing out of the second-effect evaporator: 200 flows out and is condensed in the condenser: 500.

[0004] However, the secondary steam flowing out of the double-effect evaporator flows directly into the condenser and is condensed by the cooling water, so the heat is not effectively utilized. Summary of the Invention

[0005] In order to improve the utilization rate of waste heat from secondary steam, this application provides an energy-saving heat pump.

[0006] The energy-saving heat pump provided in this application adopts the following technical solution:

[0007] An energy-saving heat pump includes a multi-effect evaporation and concentration system and a heat pump steam generation system. The multi-effect evaporation and concentration system includes a live steam heating module and a live steam separator. A first live steam pipe is connected between the heat pump steam generation system and the live steam separator. The multi-effect evaporation and concentration system includes a first-effect evaporator. A second live steam pipe is connected between the live steam separator and the first-effect evaporator.

[0008] The multi-effect evaporation and concentration system includes a final-effect separator and a preheating heat exchanger. The heat pump steam generation system includes a subcooler. The live steam heating module is connected to the subcooler. A first recovery pipe is connected between the final-effect separator and the preheating heat exchanger. A first raw material pipe and a second raw material pipe are connected to the preheating heat exchanger. The inlet end of the first raw material pipe is connected to the feeding mechanism in the plant area, and the outlet end of the first raw material pipe is connected to the preheating heat exchanger. The inlet end of the second raw material pipe is connected to the preheating heat exchanger, and the outlet end of the second raw material pipe is connected to the subcooler.

[0009] A third raw material pipeline is provided to connect the first-effect evaporator and the subcooler.

[0010] By adopting the above technical solution, in the actual production and processing process, the material flows into the preheating heat exchanger through the first raw material pipeline. The secondary steam separated in the last-effect separator flows into the preheating heat exchanger through the first recovery pipeline, which can preheat the raw material flowing into the preheating heat exchanger. The preheated raw material flows to the subcooler through the second raw material pipeline. After being reheated by the subcooler, the raw material flows into the first-effect evaporator in the multi-effect evaporation and concentration system through the second raw material pipeline for evaporation and concentration. The raw material that has been preheated and reheated enters the first-effect evaporator, which can improve the efficiency of raw material evaporation and concentration, realize the recovery of the secondary steam separated in the last-effect separator, realize the utilization of the waste heat in the secondary steam, and achieve the effect of energy saving.

[0011] Preferably, the live steam heating module includes a compressor, an oil separator, a condenser, an oil cooler, and a live steam evaporator;

[0012] A first refrigerant vapor pipeline is provided between the compressor and the oil separator, and a second refrigerant vapor pipeline is provided between the oil separator and the condenser.

[0013] The first live steam pipe is connected between the condenser and the live steam separator, and the first coolant pipe is connected between the condenser and the subcooler.

[0014] The subcooler is connected to a second coolant pipe and a third coolant pipe. The outlet end of the second coolant pipe is connected to the live steam evaporator. A main expansion valve is installed on the second coolant pipe. The outlet end of the third coolant pipe is connected to the oil cooler. An oil expansion valve is installed on the third coolant pipe.

[0015] A fourth coolant pipe is provided to connect the oil cooler and the compressor.

[0016] By adopting the above technical solution, in the process of producing live steam, the refrigerant vapor discharged from the compressor flows to the oil separator through the first refrigerant vapor pipeline. The separated refrigerant vapor flows to the condenser through the second refrigerant vapor pipeline to heat the hot water in the condenser. The hot water flows to the separator through the first live steam pipeline. The high-temperature live steam separated in the live steam separator flows to the first-effect evaporator through the second live steam pipeline. At the same time, the coolant condensed in the condenser flows to the subcooler through the first coolant pipeline. The material flowing into the subcooler through the second raw material pipeline further cools the coolant. The further cooled coolant flows through the second coolant pipeline, passes through the main expansion valve for throttling, and enters the live steam evaporator to absorb the residual heat of the secondary steam returning from the last-effect separator, changing from liquid to gas and being absorbed by the compressor. Another path flows through the third coolant pipeline, passes through the oil circuit expansion valve for throttling and cooling, and enters the oil cooler. After being heated and vaporized by the high-temperature coolant vapor, it is also absorbed by the compressor. The coolant can be vaporized by the secondary steam in the evaporator.

[0017] Preferably, a live steam condensate pipe is provided between the first-effect evaporator and the live steam separator, and a first condensate tank is installed on the live steam condensate pipe.

[0018] A hot water supply pipe is connected between the live steam condensate pipe and the condenser, and a circulating water pump is installed on the hot water supply pipe.

[0019] By adopting the above technical solution, the condensate formed by the condensation of live steam in the first-effect evaporator can flow into the first condensate tank through the live steam condensate pipe. It can then be sent into the condenser after being pressurized by the circulating water pump along with the hot water in the live steam separator. In the condenser, it is reheated to form new live steam, thus achieving the technical effect of recycling and utilizing live steam condensate.

[0020] Preferably, the multi-effect evaporation and concentration system includes a second condensate tank and a final-effect evaporator, and a second recovery pipe is provided connecting the final-effect evaporator and the second condensate tank.

[0021] By adopting the above technical solution, the secondary steam in the last-effect evaporator flows into the second condensate tank through the second recovery pipe and is cooled to form condensate. This allows the secondary steam and live steam condensate generated in the last-effect evaporator to be separated separately, reducing the amount of wastewater that needs to be treated later.

[0022] Preferably, a third recovery pipe is provided between the preheating heat exchanger and the second condensate tank.

[0023] By adopting the above technical solution, the secondary steam that has absorbed heat and cooled after passing through the preheating heat exchanger can be recovered to the second condensate tank for unified cooling and recovery treatment through the third recovery pipeline.

[0024] In summary, the energy-saving heat pump of this application has at least one of the following beneficial technical effects:

[0025] 1. In the actual production and processing process, the material flows into the preheating heat exchanger through the first raw material pipeline. The secondary steam separated in the last-effect separator flows into the preheating heat exchanger through the first recovery pipeline. The raw material flowing into the preheating heat exchanger can be preheated through the first recovery pipeline. The preheated raw material flows to the subcooler through the second raw material pipeline. After being reheated by the subcooler, the raw material flows into the first-effect evaporator in the multi-effect evaporation and concentration system through the second raw material pipeline for evaporation and concentration. The raw material that has been preheated and reheated enters the first-effect evaporator, which can improve the efficiency of raw material evaporation and concentration. It can also realize the recovery of the secondary steam separated in the last-effect separator, realize the utilization of the waste heat in the secondary steam, and achieve the effect of energy saving.

[0026] 2. By setting up the first condensate tank and the second condensate tank, the condensate water of the secondary steam and the live steam are collected separately, which can separate the secondary steam and the live steam condensate water generated in the final effect evaporator, reducing the amount of wastewater that needs to be treated later. Attached Figure Description

[0027] Figure 1 This is a schematic diagram in the background section used to illustrate a common dual-effect TVR evaporation and concentration process in existing technologies.

[0028] Figure 2 This is a schematic diagram illustrating the overall structure of an energy-saving heat pump unit, as shown in the embodiments of this application.

[0029] Explanation of reference numerals in the attached diagram: 100, First-effect evaporator; 200, Second-effect evaporator; 300, First-stage separator; 400, Second-stage separator; 500, Condenser; 600, Vacuum pump; 1, Multi-effect evaporation and concentration system; 11, First-effect evaporator; 12, Last-effect separator; 13, Preheating heat exchanger; 14, Last-effect evaporator; 15, Second condensate tank; 2, Heat pump steam generation system; 21, Live steam heating module; 211, Compressor; 212, Oil separator; 213, Condenser; 214, Oil cooler; 215, Live steam evaporator; 216, Main expansion valve; 217, Oil expansion valve; 22, Live steam separator; 23, First condensate tank; 24, Circulating water pump; 25, Subcooler. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 2 This application will be described in further detail.

[0031] Example

[0032] This application discloses an energy-saving heat pump. (Refer to...) Figure 2 It mainly includes a multi-effect evaporation and concentration system 1 and a heat pump steam generation system 2. The multi-effect evaporation and concentration system 1 includes a live steam heating module 21 and a live steam separator 22. A first live steam pipe is provided between the heat pump steam generation system 2 and the live steam separator 22. The multi-effect evaporation and concentration system 1 includes a first-effect evaporator 11. A second live steam pipe is provided between the live steam separator 22 and the first-effect evaporator 11.

[0033] The multi-effect evaporation and concentration system 1 includes a final-effect separator 12 and a preheating heat exchanger 13. The heat pump steam generation system 2 includes a subcooler 25. The live steam heating module 21 is connected to the subcooler 25. A first recovery pipe is connected between the final-effect separator 12 and the preheating heat exchanger 13. A first raw material pipe and a second raw material pipe are connected to the preheating heat exchanger 13. The inlet end of the first raw material pipe is connected to the feeding mechanism in the plant area, and the outlet end of the first raw material pipe is connected to the preheating heat exchanger 13. The inlet end of the second raw material pipe is connected to the preheating heat exchanger 13, and the outlet end of the second raw material pipe is connected to the subcooler 25. A third raw material pipe is connected between the first-effect evaporator 11 and the subcooler 25.

[0034] In the actual production and processing process, the material flows into the preheating heat exchanger 13 through the first raw material pipeline. The secondary steam separated in the final-effect separator 12 flows into the preheating heat exchanger 13 through the first recovery pipeline. The raw material flowing into the preheating heat exchanger 13 can be preheated through the first recovery pipeline. The preheated raw material flows to the subcooler 25 through the second raw material pipeline. After being reheated by the subcooler 25, the raw material flows into the first-effect evaporator 11 in the multi-effect evaporation and concentration system 1 through the second raw material pipeline for evaporation and concentration. The raw material that has been preheated and reheated enters the first-effect evaporator 11, which can improve the efficiency of raw material evaporation and concentration, realize the recovery of the secondary steam separated in the final-effect separator 12, realize the utilization of the waste heat in the secondary steam, and achieve the effect of energy saving.

[0035] Reference Figure 2The live steam heating module 21 includes a compressor 211, an oil separator 212, a condenser 213, an oil cooler 214, and a live steam evaporator 215. A first refrigerant vapor pipeline is connected between the compressor 211 and the oil separator 212, and a second refrigerant vapor pipeline is connected between the oil separator 212 and the condenser 213. The first live steam pipeline is connected between the condenser 213 and the live steam separator 22, and a first coolant pipeline is connected between the condenser 213 and the subcooler 25. A second coolant pipeline and a third coolant pipeline are connected to the subcooler 25. The outlet end of the second coolant pipeline is connected to the live steam evaporator 215, and a main expansion valve 216 is installed on the second coolant pipeline. The outlet end of the third coolant pipeline is connected to the oil cooler 214, and an oil expansion valve 217 is installed on the third coolant pipeline. A fourth coolant pipeline is connected between the oil cooler 214 and the compressor 211.

[0036] During the production of live steam, the refrigerant vapor discharged from the compressor 211 flows into the oil separator 212 through the first refrigerant vapor pipeline. The separated refrigerant vapor flows into the condenser 213 through the second refrigerant vapor pipeline to heat the hot water in the condenser 213. The hot water flows into the separator through the first live steam pipeline. The high-temperature live steam separated in the live steam separator 22 flows into the first-effect evaporator 11 through the second live steam pipeline. Meanwhile, the coolant condensed in the condenser 213 flows to the subcooler 25 through the first coolant pipe. The material flowing into the subcooler 25 through the second raw material pipe further cools the coolant. The further cooled coolant flows through the second coolant pipe, passes through the main expansion valve and enters the live steam evaporator 215, where it absorbs the residual heat of the secondary steam returning from the final-effect separator 12, changing from liquid to gas and being absorbed by the compressor 211. Another coolant flows through the third coolant pipe, passes through the oil expansion valve 217 and enters the oil cooler 214 after being throttled and cooled. The coolant cooled by the oil cooler 214 flows through the fourth coolant pipe and is heated and vaporized by the high-temperature coolant steam, and is then absorbed by the compressor 211. The coolant can be vaporized by the secondary steam in the evaporator.

[0037] At the same time, by using steam to heat the material, the requirements for the pressure resistance of the evaporator are reduced, making it suitable for evaporators with low pressure resistance (such as plate evaporators) and also suitable for the retrofitting of existing evaporation and concentration equipment.

[0038] Reference Figure 2 A live steam condensate pipe is provided between the first-effect evaporator 11 and the live steam separator 22, and a first condensate tank 23 is installed on the live steam condensate pipe; a hot water supply pipe is provided between the live steam condensate pipe and the condenser 213, and a circulating water pump 24 is installed on the hot water supply pipe.

[0039] The condensate formed by the condensation of live steam in the first-effect evaporator 11 can flow into the first condensate tank 23 through the live steam condensate pipe. It can then be sent to the condenser 213 after being pressurized by the circulating water pump 24 along with the hot water in the live steam separator 22. In the condenser 213, it is reheated to form new live steam, thus achieving the technical effect of recycling live steam condensate.

[0040] Reference Figure 2 The multi-effect evaporation and concentration system 1 includes a second condensate tank 15 and a final-effect evaporator 14, and a second recovery pipe is provided between the final-effect evaporator 14 and the second condensate tank 15.

[0041] The secondary steam in the last-effect evaporator 14 flows into the second condensate tank 15 through the second recovery pipe and is cooled to form condensate. This allows the secondary steam and live steam condensate generated in the last-effect evaporator 14 to be separated separately, reducing the amount of wastewater that needs to be treated later.

[0042] Reference Figure 2 A third recovery pipe is provided between the preheating heat exchanger 13 and the second condensate tank 15.

[0043] The secondary steam, which has absorbed heat and been cooled by the preheating heat exchanger 13, can be recovered to the second condensate tank 15 for unified cooling and recovery through the third recovery pipeline.

[0044] It should be noted that in the embodiments of this application, the multi-effect evaporation and concentration system 1 adopts a two-effect evaporation and concentration system and the heat pump steam generation system 2 adopts a plate-type rising and falling film type. In some other embodiments, the multi-effect evaporation and concentration system 1 can be replaced with a single-effect or multi-effect system according to actual practical needs, and the heat pump steam generation system 2 can be replaced with a falling film shell type, a falling film plate type, a rising and falling film plate type, etc., which will not be limited or elaborated here.

[0045] The implementation principle of an energy-saving heat pump according to an embodiment of this application is as follows: During actual production and processing, the material flows into the preheating heat exchanger 13 through the first raw material pipeline. The secondary steam separated in the final-effect separator 12 flows into the preheating heat exchanger 13 through the first recovery pipeline. The raw material flowing into the preheating heat exchanger 13 can be preheated through the first recovery pipeline. The preheated raw material flows to the subcooler 25 through the second raw material pipeline. After the raw material is reheated by the subcooler 25, it flows into the first-effect evaporator 11 in the multi-effect evaporation and concentration system 1 through the second raw material pipeline for evaporation and concentration. The raw material that has been preheated and reheated enters the first-effect evaporator 11, which can improve the efficiency of raw material evaporation and concentration, realize the recovery of the secondary steam separated in the final-effect separator 12, realize the utilization of the waste heat in the secondary steam, and achieve the effect of energy saving.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An energy-saving heat pump, characterized in that, The system includes a multi-effect evaporation and concentration system (1) and a heat pump steam generation system (2). The heat pump steam generation system (2) includes a live steam heating module (21) and a live steam separator (22). A first live steam pipe is provided between the live steam heating module (21) and the live steam separator (22). The multi-effect evaporation and concentration system (1) includes a first-effect evaporator (11). A second live steam pipe is provided between the live steam separator (22) and the first-effect evaporator (11). The multi-effect evaporation and concentration system (1) includes a final-effect separator (12) and a preheating heat exchanger (13). The heat pump steam generation system (2) includes a subcooler (25). The live steam heating module (21) is connected to the subcooler (25). A first recovery pipe is connected between the final-effect separator (12) and the preheating heat exchanger (13). A first raw material pipe and a second raw material pipe are connected to the preheating heat exchanger (13). The feed end of the first raw material pipe is connected to the feeding mechanism in the plant area. The discharge end of the first raw material pipe is connected to the preheating heat exchanger (13). The feed end of the second raw material pipe is connected to the preheating heat exchanger (13). The discharge end of the second raw material pipe is connected to the subcooler (25). A third raw material pipeline is provided to connect the single-effect evaporator (11) and the subcooler (25).

2. The energy-saving heat pump according to claim 1, characterized in that, The live steam heating module (21) includes a compressor (211), an oil separator (212), a condenser (213), an oil cooler (214), and a live steam evaporator (215). A first refrigerant vapor pipe is provided between the compressor (211) and the oil separator (212), and a second refrigerant vapor pipe is provided between the oil separator (212) and the condenser (213). The first live steam pipe is connected between the condenser (213) and the live steam separator (22), and the first coolant pipe is connected between the condenser (213) and the subcooler (25). The subcooler (25) is connected to a second coolant pipe and a third coolant pipe. The outlet end of the second coolant pipe is connected to the live steam evaporator (215). A main expansion valve (216) is installed on the second coolant pipe. The outlet end of the third coolant pipe is connected to the oil cooler (214). An oil expansion valve (217) is installed on the third coolant pipe. A fourth coolant pipe is provided to connect the oil cooler (214) and the compressor (211).

3. The energy-saving heat pump according to claim 2, characterized in that, A live steam condensate pipe is provided between the single-effect evaporator (11) and the live steam separator (22), and a first condensate tank (23) is installed on the live steam condensate pipe. A hot water supply pipe is provided between the live steam condensate pipe and the condenser (213), and a circulating water pump (24) is installed on the hot water supply pipe.

4. An energy-saving heat pump according to claim 3, characterized in that, The multi-effect evaporation and concentration system (1) includes a second condensate tank (15) and a final-effect evaporator (14), and a second recovery pipe is provided between the final-effect evaporator (14) and the second condensate tank (15).

5. An energy-saving heat pump according to claim 4, characterized in that, A third recovery pipe is provided between the preheating heat exchanger (13) and the second condensate tank (15).

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