Heat pump evaporation and concentration system

Abstract

The utility model discloses a heat pump evaporation and concentration system which comprises a heat pump unit, a material evaporation unit and a plurality of pipelines, and the pipelines comprise a material pipeline, a water passing pipeline, a solvent steam pipeline and a refrigerant pipeline. The heat pump unit comprises a compressor, an expansion valve, a first evaporator and a second evaporator, the refrigerant pipeline is provided with a first branch and a second branch which are connected in parallel, the first evaporator is arranged on the first branch, the solvent steam pipeline is communicated with the first evaporator, and solvent steam in the solvent steam pipeline exchanges heat with a refrigerant; the second evaporator is arranged on the second branch, the water passing pipeline comprises a first circulating water path communicated with the second evaporator, and water in the first circulating water path preheats the refrigerant. The heat pump evaporation concentration system disclosed by the utility model is loose in operation condition, energy-saving, environment-friendly and low in operation cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of concentration systems, and in particular relates to a heat pump evaporation concentration system. Background Art

[0002] The evaporation concentration system is used for the concentration and purification of heat-sensitive materials. The existing evaporation concentration equipment on the market needs to preheat the materials to activate the entire heat pump system, which requires both heat source for heating and cold source for cooling, resulting in two-way energy consumption, high unit energy cost, and large solvent loss. At the same time, the high temperature of the heat source causes great damage to heat-sensitive materials. Most of the existing evaporation concentration equipment requires steam to provide a heat source. For customers who do not have boilers and pipeline steam, the evaporation concentration equipment cannot be used normally, and the operating conditions are harsh. Summary of the invention

[0003] The utility model provides a heat pump evaporation concentration system in view of the problems of energy consumption and harsh operating conditions of evaporation concentration equipment in the prior art.

[0004] The invention objective of the utility model is achieved through the following technical solutions:

[0005] A heat pump evaporation concentration system comprises a heat pump unit, a material evaporation unit and a plurality of pipelines, wherein the pipelines comprise a material pipeline, a water pipeline, a solvent vapor pipeline and a refrigerant pipeline; the heat pump unit comprises a compressor, an expansion valve, a first evaporator and a second evaporator, the refrigerant pipeline is provided with a first branch and a second branch connected in parallel, the first evaporator is arranged on the first branch, and the solvent vapor pipeline is connected to the first evaporator, and the solvent vapor in the solvent vapor pipeline exchanges heat with the refrigerant; the second evaporator is arranged on the second branch, the water pipeline comprises a first circulating water circuit connected to the second evaporator, and the water in the first circulating water circuit preheats the refrigerant.

[0006] Preferably, the refrigerant pipeline includes a liquid inlet trunk arranged in front of the first branch and the second branch, and a liquid outlet trunk arranged behind the first branch and the second branch, the expansion valve is arranged on the liquid inlet trunk, and the compressor is arranged on the liquid outlet trunk.

[0007] Preferably, the material pipeline includes a liquid inlet pipeline and a liquid outlet pipeline, and the material evaporation unit includes a multi-effect evaporation component arranged between the liquid inlet pipeline and the liquid outlet pipeline.

[0008] Preferably, the multi-effect evaporation assembly includes a first evaporation tank and a third evaporator matched with the first evaporation tank, and also includes a second evaporation tank and a fourth evaporator matched with the second evaporation tank; the liquid outlet end of the liquid inlet pipeline is connected to the liquid inlet of the first evaporation tank, and the liquid inlet end of the liquid outlet pipeline is connected to the liquid outlet of the second evaporation tank.

[0009] Preferably, the third evaporator is connected to a refrigerant pipeline, and the refrigerant in the third evaporator exchanges heat with the material.

[0010] Preferably, the solvent steam pipeline includes a first steam pipeline, a second steam pipeline and a third steam pipeline, and the first steam pipeline is connected between the first evaporation tank and the fourth evaporator.

[0011] Preferably, the second steam pipeline is connected between the second evaporation tank and the first evaporator; and the third steam pipeline is connected between the fourth evaporator and the first evaporator.

[0012] Preferably, the water pipeline further includes a second circulating water circuit which is connected to the first evaporator and cools the solvent.

[0013] Compared with the prior art, the utility model has the following beneficial effects: in this scheme, two parallel branches are arranged on the refrigerant pipeline, the first branch is arranged to realize heat exchange when the heat pump system is officially in operation, and the second branch can use waste hot water to preheat the refrigerant before the entire heat pump evaporation and concentration system is officially in operation, thereby activating the entire heat pump system, and there is no need to preheat the materials. The operation of the entire heat pump system does not require additional heat source, and only electric energy is required to complete the entire evaporation and concentration process, which solves the problem of steam source for customers. The heat pump system can operate normally without boiler and pipeline steam, and the operating conditions are loose; multiple pipelines are reasonably arranged, and through the use of both cold and hot sides of energy, material solution concentration and purification, solvent evaporation and solvent recovery are realized, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the refrigerant pipeline structure in the utility model;

[0016] Markings in the figure: compressor 11; expansion valve 12; first evaporator 13; second evaporator 14; first evaporation tank 21; second evaporation tank 23; third evaporator 22; fourth evaporator 24; liquid inlet trunk 31; liquid outlet trunk 32; first branch 33; second branch 34; liquid inlet pipeline 41; liquid outlet pipeline 42; first steam pipeline 51; second steam pipeline 52; third steam pipeline 53; first circulating water circuit 61; second circulating water circuit 62. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0018] See also Figure 1 , Figure 2This embodiment discloses a heat pump evaporation and concentration system for concentrating and purifying heat-sensitive materials and recovering solvents. The heat pump evaporation and concentration system includes a heat pump unit, a material evaporation unit and a plurality of pipelines, wherein the pipelines include a material pipeline, a water pipeline, a solvent vapor pipeline and a refrigerant pipeline.

[0019] The heat pump unit includes a compressor 11, an expansion valve 12, a first evaporator 13 and a second evaporator 14. The refrigerant pipeline is provided with a first branch 33 and a second branch 34 connected in parallel. The first evaporator 13 is arranged on the first branch 33, and the solvent vapor pipeline is connected to the first evaporator 13, and the solvent vapor in the solvent vapor pipeline exchanges heat with the refrigerant; the second evaporator 14 is arranged on the second branch 34, and the water pipeline includes a first circulating water circuit 61 connected to the second evaporator 14, and the first circulating water circuit 61 is passed with waste hot water, and the waste hot water preheats the refrigerant. Before the entire system is officially operated, the waste hot water in the first circulating water circuit 61 preheats the refrigerant in the second evaporator 14, thereby activating the entire heat pump system, and there is no need to preheat the material, which solves the problem of the customer's steam source. The heat pump system can operate normally without boiler and pipeline steam, and the operating conditions are loose.

[0020] The refrigerant pipeline includes a liquid inlet trunk 31 arranged in front of the first branch 33 and the second branch 34, and a liquid outlet trunk 32 arranged behind the first branch 33 and the second branch 34. The expansion valve 12 is arranged on the liquid inlet trunk 31, and the compressor 11 is arranged on the liquid outlet trunk 32.

[0021] The material pipeline includes a liquid inlet pipeline 41 and a liquid outlet pipeline 42, and the material evaporation unit includes a multi-effect evaporation component arranged between the liquid inlet pipeline 41 and the liquid outlet pipeline 42; the multi-effect evaporation component includes a first evaporation tank 21, and a third evaporator 22 matched with the first evaporation tank 21, and also includes a second evaporation tank 23, and a fourth evaporator 24 matched with the second evaporation tank 23; the liquid outlet end of the liquid inlet pipeline 41 is connected to the liquid inlet of the first evaporation tank 21, and the liquid inlet end of the liquid outlet pipeline 42 is connected to the liquid outlet of the second evaporation tank 23, the first evaporation tank 21 is connected to the second evaporation tank 23, and the material solution after the initial concentration enters the second evaporation tank 23 for secondary concentration; the third evaporator 22 is connected to the refrigerant pipeline, and the heated refrigerant exchanges heat with the material in the third evaporator 22, and the material solution is heated to evaporate the solvent, and the low-concentration material solution is concentrated after passing through the multi-effect evaporation component.

[0022] The solvent steam pipeline includes a first steam pipeline 51, a second steam pipeline 52 and a third steam pipeline 53. The first steam pipeline 51 is connected between the first evaporation tank 21 and the fourth evaporator 24. The solvent steam evaporated by heat exchange in the third evaporator 22 enters the fourth evaporator 24 through the first steam pipeline 51, and is used as a heat source to heat the material solution after the primary concentration to achieve secondary concentration. The solvent steam in the first steam pipeline 51 is 80°C steam; the second steam pipeline 52 is connected between the second evaporation tank 23 and the first evaporator 13. The solvent steam generated by the secondary concentration enters the first evaporator 13 through the second steam pipeline 52, and is used as a heat source to heat the refrigerant after heat exchange. The solvent steam in the second steam pipeline 52 is 70°C steam; the third steam pipeline 53 is connected between the fourth evaporator 24 and the first evaporator 13. The solvent steam generated by the primary concentration enters the first evaporator 13 for further heat exchange after heat exchange in the fourth evaporator 24.

[0023] After the heat exchange, the solvent is discharged through the first evaporator 13. The water pipeline also includes a second circulating water circuit 62 which is connected to the first evaporator 13 and cools the solvent. The second circulating water circuit 62 cools the solvent to achieve solvent recovery.

[0024] The utility model discloses a heat pump evaporation concentration system which can operate normally without external pipeline steam and boiler, and has loose operating conditions; and the pipeline is reasonably arranged, and through the cold and hot double-side utilization of the heat source, material solution concentration and purification, solvent evaporation and solvent recovery are achieved, with low operating cost, energy saving and environmental protection.

[0025] It should be understood that in the claims and description of the utility model, all "including..." should be understood as open-ended meanings, that is, their meanings are equivalent to "at least including...", and should not be understood as closed-ended meanings, that is, their meanings should not be understood as "only including...". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0026] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should be covered by the protection scope of the utility model.

Claims

1. A heat pump evaporation concentration system, comprising a heat pump unit, a material evaporation unit and a plurality of pipelines, characterized in that: The pipeline includes a material pipeline, a water pipeline, a solvent vapor pipeline and a refrigerant pipeline; the heat pump unit includes a compressor, an expansion valve, a first evaporator and a second evaporator, and the refrigerant pipeline is provided with a first branch and a second branch connected in parallel. The first evaporator is arranged on the first branch, and the solvent vapor pipeline is connected to the first evaporator, and the solvent vapor in the solvent vapor pipeline exchanges heat with the refrigerant; the second evaporator is arranged on the second branch, and the water pipeline includes a first circulating water circuit connected to the second evaporator, and the water in the first circulating water circuit preheats the refrigerant.

2. A heat pump evaporation concentration system according to claim 1, characterized in that: The refrigerant pipeline includes a liquid inlet trunk line arranged in front of the first branch and the second branch, and a liquid outlet trunk line arranged behind the first branch and the second branch. The expansion valve is arranged on the liquid inlet trunk line, and the compressor is arranged on the liquid outlet trunk line.

3. A heat pump evaporation concentration system according to claim 1, characterized in that: The material pipeline includes a liquid inlet pipeline and a liquid outlet pipeline, and the material evaporation unit includes a multi-effect evaporation component arranged between the liquid inlet pipeline and the liquid outlet pipeline.

4. A heat pump evaporation concentration system according to claim 3, characterized in that: The multi-effect evaporation assembly includes a first evaporation tank and a third evaporator matched with the first evaporation tank, and also includes a second evaporation tank and a fourth evaporator matched with the second evaporation tank; the liquid outlet end of the liquid inlet pipeline is connected to the liquid inlet of the first evaporation tank, and the liquid inlet end of the liquid outlet pipeline is connected to the liquid outlet of the second evaporation tank.

5. A heat pump evaporation concentration system according to claim 4, characterized in that: The third evaporator is connected to the refrigerant pipeline, and the refrigerant in the third evaporator exchanges heat with the material.

6. A heat pump evaporation concentration system according to claim 5, characterized in that: The solvent steam pipeline includes a first steam pipeline, a second steam pipeline and a third steam pipeline, and the first steam pipeline is connected between the first evaporation tank and the fourth evaporator.

7. A heat pump evaporation concentration system according to claim 6, characterized in that: The second steam pipeline is connected between the second evaporation tank and the first evaporator; the third steam pipeline is connected between the fourth evaporator and the first evaporator.

8. A heat pump evaporation concentration system according to any one of claims 1 to 7, characterized in that: The water pipeline also includes a second circulating water circuit which is in communication with the first evaporator and is used to cool the solvent.

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