CN116481205A - A low-temperature heat source refrigeration system and method - Google Patents

Abstract

The invention relates to a low-temperature heat source refrigerating system and a method, wherein the low-temperature heat source refrigerating system comprises a condensation generating device, a heat pump subsystem and an absorption refrigerating subsystem; the condensation generating device comprises an absorption refrigeration generator and a heat pump condenser; the heat pump condenser is located inside or outside the absorption refrigeration generator. Besides the system, the system also comprises an absorbent heat pump condensation regeneration method and a system low-temperature heat source refrigeration method. According to the invention, a small amount of electric energy is input, the low-temperature heat source temperature is raised by using the heat pump, so that the absorption refrigeration system is driven to refrigerate, and the high-energy-efficiency-ratio operation is realized, so that the refrigeration requirement of an air conditioning or production process is met, and the system operation cost is reduced, the energy is saved, and the carbon emission is reduced.

Description

A low-temperature heat source refrigeration system and method

technical field

The invention relates to a low-temperature heat source refrigeration system and method, in particular to a low-temperature heat source refrigeration system and method for driving an absorption refrigeration system to refrigerate by inputting a small amount of electric energy and using a heat pump to raise the temperature of the low-temperature heat source, which belongs to the technical field of energy conservation and environmental protection.

Background technique

There are a large number of heat sources in industrial and agricultural production, residents' living processes and the natural environment, and rational use of them is one of the ways to save energy and reduce emissions. Absorption refrigeration driven by heat source is one of the ways to utilize heat source. However, the commonly used existing lithium bromide absorption refrigeration technology requires the heat source to have a driving temperature above about 80°C to overcome the boiling point rise required for the regeneration of lithium bromide solution. Some low-temperature heat source resources are difficult to obtain, and direct discharge will cause environmental thermal pollution and a large amount of waste of heat source resources.

Contents of the invention

Purpose of the invention: To provide a low-temperature heat source refrigeration system, which uses a heat pump to increase the temperature of the low-temperature heat source to drive the low-temperature heat source refrigeration of the absorption refrigeration system.

Technical solution: The low-temperature heat source refrigeration system of the present invention includes a condensation generating device; the condensation generating device includes a generator and a heat pump condenser; the heat pump condenser is located inside or outside the generator.

Further, it also includes a heat pump subsystem; the heat pump subsystem includes a low-temperature heat source evaporator, a heat pump compressor, and a throttling device; the low-temperature heat source evaporator is connected to the inlet of the heat pump compressor through a pipeline; the outlet of the heat pump compressor is connected to the inlet of the heat pump condenser through a pipeline; the outlet of the heat pump condenser is connected to the inlet of the throttling device through a pipeline; the outlet of the throttling device is connected to the inlet of the low-temperature heat source evaporator through a pipeline.

Further, it also includes an absorption refrigeration subsystem; the absorption refrigeration subsystem includes a condenser, a refrigerant pump, an evaporator, an absorber, a vacuum pump, a solution pump, a generator pump, an absorber pump, a heat exchanger, an evaporation heat exchanger, and a cooling heat exchanger; the inlet of the condenser is connected to the steam outlet of the generator through a pipeline, and the outlet is connected to the inlet of the refrigerant pump through a pipeline; the inlet and outlet of the refrigerant pump are also connected to the evaporator through a pipeline; the steam outlet of the evaporator is connected to the steam inlet of the absorber through a pipeline; The inlet and outlet of the solution pump are connected to the absorber through pipelines; the inlet and outlet of the generator pump are respectively connected to the outlet of the absorber solution and the inlet of the heat exchanger dilute solution through pipelines; the inlet and outlet of the absorber pump are respectively connected to the outlet of the generator solution and the inlet of the concentrated solution of the heat exchanger through pipelines; the outlet of the dilute solution of the heat exchanger and the outlet of the concentrated solution are respectively connected to the inlet of the dilute solution of the generator and the inlet of the concentrated solution of the absorber through pipelines; the evaporation heat exchanger is located in the evaporator; the cooling heat exchanger is located in the absorber.

The present invention also provides a solution regeneration method implemented by the system. The heat pump working medium is throttled by the throttling device of the heat pump subsystem to expand and cool down in the low-temperature heat source evaporator, absorb the heat of the low-temperature heat source and evaporate, and enter the heat pump compressor of the heat pump subsystem after gas-liquid separation to compress and increase the pressure and temperature. The working medium is transported to the heat pump condenser through phase change and condensation, and the solution in the generator is released to heat the condensation heat to evaporate and concentrate, thereby realizing the regeneration of the working solution.

The present invention also provides a low-temperature heat source refrigeration method implemented by the system. The steam produced by the regeneration and evaporation of the solution in the generator is pushed by the pressure difference into the condenser of the absorption refrigeration subsystem to condense into low-temperature water, and then enters the inlet of the refrigerant pump for spraying and evaporative refrigeration; the steam generated by the evaporation of the refrigerant water in the evaporator of the absorption refrigeration subsystem is pushed by the pressure difference into the absorber, and is absorbed by the sprayed solution lifted by the solution pump; the external cooling circulating water is transported by the cooling water circulation pump into the cooling heat exchanger of the absorption refrigeration subsystem to take away the refrigerant vapor Condensation latent heat; the vacuum pump of the absorption refrigeration subsystem extracts the non-condensable gas in the system according to the set value to maintain the system to maintain an appropriate vacuum; the low-temperature dilute solution that absorbs the refrigerant vapor and is continuously diluted is transported to the heat exchanger by the generator pump of the absorption refrigeration subsystem to exchange heat with the high-temperature concentrated solution delivered by the absorber pump. The evaporative heat exchanger is refrigerated by evaporating and absorbing heat from the refrigerant water.

Compared with the prior art, the present invention has the beneficial effects that: the low-temperature heat source refrigeration system provided by the present invention can input a small amount of electric energy, use a heat pump to increase the temperature of the low-temperature heat source, and use it to drive the absorption refrigeration system for refrigeration, and realize high energy efficiency ratio operation to reduce energy consumption costs, meet air conditioning or production process refrigeration requirements, save energy, and reduce carbon emissions.

Description of drawings

Fig. 1 is a schematic structural diagram of the system of the present invention.

In the figure: 1, low-temperature heat source evaporator, 2, throttling device, 3, generator, 4, condenser, 5, evaporator, 6, vacuum pump, 7, absorber, 8, heat pump compressor, 9, heat pump condenser, 10, absorber pump, 11, heat exchanger, 12, refrigerant pump, 13, evaporation heat exchanger, 14, generator pump, 15, cooling heat exchanger, 16, solution pump.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

Example 1:

As shown in FIG. 1 , the low-temperature heat source refrigeration system of the present invention includes a condensation generating device; the condensation generating device includes a generator 3 and a heat pump condenser 9 ; the heat pump condenser 9 is located inside or outside the generator 3 . The heat pump working fluid is transported through pipelines to the heat pump condenser 9 for phase change and condensation, and the solution in the generator 3 is heated by releasing condensation heat to evaporate and concentrate.

Further, the low-temperature heat source refrigeration system also includes a heat pump subsystem; the heat pump subsystem includes a low-temperature heat source evaporator 1, a heat pump compressor 8, and a throttling device 2; the low-temperature heat source evaporator 1 is connected to the inlet of the heat pump compressor 8 through a pipeline; the outlet of the heat pump compressor 8 is connected to the inlet of the heat pump condenser 9 through a pipeline; the outlet of the heat pump condenser 9 is connected to the inlet of the throttling device 2 through a pipeline;

Further, the low-temperature heat source refrigeration system also includes an absorption refrigeration subsystem; the absorption refrigeration subsystem includes a condenser 4, a refrigerant pump 12, an evaporator 5, an absorber 7, a vacuum pump 6, a solution pump 16, a generator pump 14, an absorber pump 10, a heat exchanger 11, an evaporation heat exchanger 13, and a cooling heat exchanger 15; the inlet of the condenser 4 is connected to the steam outlet of the generator 3 through a pipeline, and the outlet is connected to the inlet of the refrigerant pump 12 through a pipeline; It is also connected with the evaporator 5; the steam outlet of the evaporator 5 is connected with the steam inlet of the absorber 7 through a pipeline; the air inlet of the vacuum pump 6 is connected with the absorber 7 through a pipeline; the inlet and outlet of the solution pump 16 are connected with the absorber 7 through a pipeline; The pipes are respectively connected to the inlet of the dilute solution of the generator 3 and the inlet of the concentrated solution of the absorber 7; the evaporation heat exchanger 13 is located in the evaporator 5; the cooling heat exchanger 15 is located in the absorber 7.

The present invention also provides a solution regeneration method implemented by the system. The heat pump working medium is throttled by the throttling device 2 of the heat pump subsystem to the low-temperature heat source evaporator 1 to expand and cool down, absorb the heat of the low-temperature heat source and evaporate, and enter the heat pump compressor 8 of the heat pump subsystem after gas-liquid separation to compress and increase the pressure and temperature.

The present invention also provides a low-temperature heat source refrigeration method implemented by the system. The steam generated by the regeneration and evaporation of the solution in the generator 3 is pushed by the pressure difference into the condenser 4 of the absorption refrigeration subsystem to condense into low-temperature water, and then enters the inlet of the refrigerant pump 12 for spraying and evaporative refrigeration; the steam generated by the evaporation of the refrigerant water in the evaporator 5 of the absorption refrigeration subsystem is pushed into the absorber 7 by the pressure difference, and is absorbed by the sprayed solution lifted by the solution pump 16; The vacuum pump 6 of the absorption refrigeration subsystem extracts the non-condensable gas in the system according to the set value to maintain an appropriate vacuum degree in the system; the low-temperature dilute solution that absorbs the continuous dilution of refrigerant vapor is transported through the generator pump 14 of the absorption refrigeration subsystem and enters the heat exchanger 11 to exchange heat with the high-temperature concentrated solution delivered by the absorber pump 10. The refrigerant steam; the refrigerant water is transported by the refrigerant water circulation pump into the evaporative heat exchanger 13 of the absorption refrigeration subsystem, and the refrigerant water evaporates, absorbs heat and cools down for cooling. The above-mentioned process runs cyclically to realize refrigeration driven by a low-temperature heat source.

As stated above, while the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A low temperature heat source refrigeration system, characterized by: comprises a condensation generating device; the condensation generating device comprises a generator (3) and a heat pump condenser (9); the heat pump condenser (9) is located inside or outside the generator (3).

2. The low temperature heat source refrigeration system of claim 1, wherein: further comprising a heat pump subsystem; the heat pump subsystem comprises a low-temperature heat source evaporator (1), a heat pump compressor (8) and a throttling device (2); the low-temperature heat source evaporator (1) is connected with an inlet of the heat pump compressor (8) through a pipeline; the outlet of the heat pump compressor (8) is connected with the inlet of the heat pump condenser (9) through a pipeline; the outlet of the heat pump condenser (9) is connected with the inlet of the throttling device (2) through a pipeline; the outlet of the throttling device (2) is connected with the inlet of the low-temperature heat source evaporator (1) through a pipeline.

3. The low temperature heat source refrigeration system of claim 1, wherein: further comprising an absorption refrigeration subsystem; the absorption refrigeration subsystem comprises a condenser (4), a refrigerant pump (12), an evaporator (5), an absorber (7), a vacuum pump (6), a solution pump (16), a generator pump (14), an absorber pump (10), a heat exchanger (11), an evaporation heat exchanger (13) and a cooling heat exchanger (15); the inlet of the condenser (4) is connected with the steam outlet of the generator (3) through a pipeline, and the outlet is connected with the inlet of the refrigerant pump (12) through a pipeline; the inlet and outlet of the refrigerant pump (12) are also connected with the evaporator (5) through a pipeline; the steam outlet of the evaporator (5) is connected with the steam inlet of the absorber (7) through a pipeline; the air inlet of the vacuum pump (6) is connected with the absorber (7) through a pipeline; the inlet and outlet of the solution pump (16) are connected with the absorber (7) through a pipeline; the inlet and the outlet of the generator pump (14) are respectively connected with the solution outlet of the absorber (7) and the dilute solution inlet of the heat exchanger (11) through pipelines; the inlet and the outlet of the absorber pump (10) are respectively connected with the solution outlet of the generator (3) and the concentrated solution inlet of the heat exchanger (11) through pipelines; the dilute solution outlet and the concentrated solution outlet of the heat exchanger (11) are respectively connected with the dilute solution inlet of the generator (3) and the concentrated solution inlet of the absorber (7) through pipelines; the evaporation heat exchanger (13) is positioned in the evaporator (5); the cooling heat exchanger (15) is located within the absorber (7).

4. A solution regeneration process carried out by the system of any one of claims 1 to 3, characterized in that: the heat pump working medium is throttled to a low-temperature heat source evaporator (1) through a throttling device (2) of the heat pump subsystem to expand and cool, absorbs low-temperature heat to evaporate, enters a heat pump compressor (8) of the heat pump subsystem after vapor-liquid separation to compress and raise pressure and temperature, is conveyed to a heat pump condenser (9) through a pipeline to be subjected to phase-change condensation, and releases the solution in a condensation heat heating generator (3) to evaporate and concentrate, so that the regeneration of the working solution is realized.

5. A low temperature heat source refrigeration method implemented by the system of any one of claims 1 to 3, characterized in that: vapor generated by solution regeneration and evaporation in the generator (3) is pushed by pressure difference to enter a condenser (4) of the absorption refrigeration subsystem to be condensed into low-temperature water, and enters an inlet of a refrigerant pump (12) for spray evaporation refrigeration; vapor generated by evaporation of the refrigerant water in the evaporator (5) of the absorption refrigeration subsystem is pushed into the absorber (7) by pressure difference and is absorbed by the solution sprayed by the solution pump (16); the external cooling circulating water is conveyed into a cooling heat exchanger (15) of the absorption refrigeration subsystem through a cooling water circulating pump and is used for taking away the latent heat of condensation of the refrigerant steam; a vacuum pump (6) of the absorption refrigeration subsystem extracts non-condensable gas in the system according to a set value so as to maintain the system to maintain proper vacuum degree; the low-temperature dilute solution which is continuously diluted by absorbing the refrigerant steam is conveyed into a heat exchanger (11) through a generator pump (14) of an absorption refrigeration subsystem to exchange heat with the high-temperature concentrated solution conveyed by an absorber pump (10), the dilute solution after heat exchange and temperature rise is conveyed into a generator (3) to be evaporated, concentrated and regenerated, and the concentrated solution after heat exchange and temperature reduction is conveyed into an absorber (7) to spray and absorb the refrigerant steam; the refrigerant water is conveyed into an evaporation heat exchanger (13) of the absorption refrigeration subsystem through a refrigerant water circulating pump, and is subjected to evaporation, heat absorption, cooling and refrigeration.