CN110285596A - A Pure CO2 Ice Skating Rink Refrigeration System - Google Patents

Abstract

The invention discloses a pure CO2 skating rink refrigeration system, the structure of which includes a transcritical compressor unit, an oil separator, a heat recovery heat exchanger, a CO2 low-pressure liquid storage device, and a CO2 low-pressure liquid storage device pressure maintaining unit installed in a machine room , the CO2 cooler is installed outdoors, and the ice rink pipeline heat exchanger is installed in the ice rink; the pure CO2 refrigeration system is adopted, and the CO2 refrigerant directly exchanges heat with the ice rink pipeline heat exchanger, and the evaporation temperature of the refrigerant is high. Large amount, high efficiency, power saving, and CO2 viscosity is low, the power of the delivery pump required is small, and CO2 is used as a refrigerant, there is always liquid in the evaporation pipeline, the evaporation temperature is stable, and the quality of the ice produced is better, and CO2 has little impact on the environment; it is an expansive technological innovation to the existing technology, and has good promotion and use value.

Description

A Pure CO2 Ice Skating Rink Refrigeration System

technical field

The invention relates to the technical field of refrigeration, in particular to a pure _CO2 ice rink refrigeration system.

Background technique

The existing ice rink system adopts the refrigerant ammonia/fluorine refrigerant, lowers the temperature of the brine in the shell-and-tube heat exchanger, and uses the brine pump to transport it to the ice rink pipeline heat exchanger to realize heat exchange. The ice layer is lowered to the required temperature. Since the cooling of the ice field undergoes secondary heat exchange, the evaporation temperature of the refrigerant is low, the power consumption is large, the energy efficiency is low, and the installation is complicated; The demand is large; the brine will corrode the pipes of the ice rink, which is unsafe; the refrigerant is harmful to the environment and human beings.

Contents of the invention

The technical problem mainly solved by the present invention is how to provide a pure CO2 skating rink refrigeration system. Using a pure CO2 refrigeration system, the CO2 refrigerant directly exchanges heat with the ice rink pipeline heat exchanger. The refrigerant has a high evaporation temperature and a large cooling capacity. High efficiency, saving electricity, and CO2 viscosity is low, the required delivery pump power is small, and CO2 is used as a refrigerant, there is always liquid in the evaporation pipeline, the evaporation temperature is stable, the quality of ice produced is better, and CO2 is harmful to the environment Less affected.

In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a pure CO2 skating rink refrigeration system, the structure of which includes a transcritical compressor unit installed in the machine room, an oil separator, a heat recovery heat exchanger, and a CO2 low pressure cooling system. Liquid receiver and CO2 low-pressure liquid receiver pressure maintenance unit, outdoor installation is equipped with CO2 cooler, and ice rink pipe heat exchanger is installed in the ice rink;

Among them, one end of the transcritical compressor is connected to the CO2 low-pressure accumulator to inhale gas through pipeline a, and the transcritical compressor is divided into two pipelines to connect with the oil separator respectively. The pipeline a of the machine enters the oil separator, and the oil in the CO2 is separated in the oil separator, and returns to the transcritical compressor through the loop pipeline b to participate in the cycle. The oil separator is connected with the heat recovery heat exchanger through the pipeline c, The heat recovery heat exchanger is connected to the hot water pool pipe through the heat recovery pump, and the high-temperature and high-pressure CO2 gas enters the heat recovery heat exchanger. In the heat recovery heat exchanger, the heat in the gas exchanges heat with the low-temperature water, and the water can be heated to 50-95°C, stored in the hot water pool under the circulation of the heat recovery pump; the heat recovery heat exchanger is connected to the CO2 cooler through the pipe b, and the CO2 cooler is installed sequentially on the output pipe to maintain the pressure of the CO2 cooler. Valve and The CO2 liquid throttling valve is connected to the CO2 low-pressure liquid receiver. The supercooled CO2 gas is further cooled in the CO2 cooler, and the maximum efficiency is exerted under the action of the pressure maintenance valve of the CO2 cooler. The CO2 drops through the CO2 liquid throttling valve. After cooling down, it enters the CO2 low-pressure liquid storage. The CO2 low-pressure liquid storage is connected to the ice rink pipeline heat exchanger in two ways. The gas and the gas generated from the ice rink pipeline heat exchanger are sucked and compressed by the compressor; the other path of the CO2 low-pressure liquid storage is connected to the ice rink pipeline heat exchanger through a liquid delivery pump, and the low-temperature and low-pressure liquid in the CO2 low-pressure liquid storage It is transported by the CO2 liquid delivery pump to the pipeline heat exchanger of the ice rink to absorb the heat of water and freeze the water into ice to complete the ice making process.

Preferably, a temperature sensor is also arranged in the outdoor ice rink.

Preferably, the CO2 low-pressure accumulator is connected with the CO2 low-pressure accumulator pressure maintaining unit.

The invention can effectively solve the problems of difficult on-site installation, high power consumption, low energy efficiency and poor safety performance, and is mainly aimed at the use of pure CO2 refrigeration system, the CO2 refrigerant directly exchanges heat with the ice rink pipeline heat exchanger, and the refrigerant evaporates High temperature, large cooling capacity, high efficiency, power saving, and CO2 viscosity is low, the power of the delivery pump required is small, CO2 is used as a refrigerant, there is always liquid in the evaporation pipeline, the evaporation temperature is stable, and the quality of the ice produced is better Yes, and CO2 is environmentally friendly and can meet technical requirements such as environmental protection.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work, wherein:

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

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, in a specific embodiment of the present invention, a pure CO2 skating rink refrigeration system, its structure includes a transcritical compressor unit (1), oil separator (2), heat recovery unit installed in the machine room Heat exchanger (3), CO2 low-pressure accumulator (9) and CO2 low-pressure accumulator pressure maintenance unit (12), CO2 cooler (6) is installed outdoors, and ice rink pipes are installed in the ice rink for heat exchange device(11);

During the specific implementation process, one end of the transcritical compressor (1) is connected to the CO2 low-pressure liquid receiver (9) to inhale gas through the pipeline a, and the transcritical compressor (1) is connected to the oil separator (2) in two pipelines respectively, The CO2 low-pressure liquid receiver (9) sucks in gas, and after the temperature rises, it enters the oil separator (2) through the transcritical compressor (1) pipeline a, and the oil in the CO2 is separated in the oil separator (2), and is re- Return to the transcritical compressor (1) to participate in the cycle through the loop pipe b, the oil separator (2) is connected to the heat recovery heat exchanger (3) through the pipe c, and the heat recovery heat exchanger (3) passes through the heat recovery pump ( 5) Connected to the hot water pool (4) with pipes, high temperature and high pressure CO2 gas enters the heat recovery heat exchanger (3), in the heat recovery heat exchanger (3), the heat in the gas exchanges heat with the low temperature water, and the water can It is heated to 50-95°C and stored in the hot water pool (4) under the circulation of the heat recovery pump (5); the heat recovery heat exchanger (3) is connected to the CO2 cooler (6) through the pipe b, and the CO2 cooler (6) Connect the CO2 cooler pressure maintenance valve (7) and CO2 liquid throttle valve (8) to the CO2 low-pressure liquid receiver (9) through the sequentially installed CO2 cooler on the output pipeline, and the supercooled CO2 gas flows in the CO2 cooler ( 6) is further cooled, and the CO2 cooler pressure maintenance valve (7) exerts the maximum efficiency. CO2 enters the CO2 low-pressure liquid storage device (9) after the CO2 liquid throttle valve (8) depressurizes and cools down, and the CO2 low-pressure The liquid receiver (9) is connected to the ice rink pipeline heat exchanger (11) in two ways, and one way is connected to the ice rink pipeline heat exchanger (11) through the delivery pipeline, and is separated in the CO2 low-pressure liquid receiver (9). The gas and the gas generated from the ice rink pipeline heat exchanger (11) are sucked and compressed by the compressor; the other way of the CO2 low-pressure liquid receiver (9) passes through the liquid delivery pump (10) and the ice rink pipeline heat exchanger (11) Connected, the low-temperature and low-pressure liquid in the CO2 low-pressure liquid receiver (9) is transported by the CO2 liquid delivery pump (10) to the ice rink pipeline heat exchanger (11) to absorb the heat of water and freeze the water into ice to complete the ice-making process.

During the specific implementation process, a temperature sensor is also arranged in the outdoor ice rink.

During specific implementation, the CO2 low-pressure accumulator (9) is connected to the CO2 low-pressure accumulator pressure maintaining unit (12).

During specific implementation, the transcritical compressors (1) are provided with four groups.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description of the present invention, or directly or indirectly used in other related technical fields, shall be The same reasoning is included in the patent protection scope of the present invention.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (3)

1. A pure CO2 skating rink refrigeration system, characterized in that the structure includes a transcritical compressor unit, an oil separator, a heat recovery heat exchanger, a CO2 low-pressure liquid accumulator, and a CO2 low-pressure liquid accumulator for pressure maintenance. The unit is equipped with a CO2 cooler outdoors, and an ice rink pipeline heat exchanger is installed in the ice rink; One end of the transcritical compressor is connected to the CO2 low-pressure accumulator through pipeline a to inhale gas, and the transcritical compressor is divided into two pipelines to connect with the oil separator respectively. Pipe a enters the oil separator, in which the oil in CO2 is separated, and returns to the transcritical compressor through the loop pipe b to participate in the cycle. The oil separator is connected to the heat recovery heat exchanger through pipe c, and the heat The recovery heat exchanger is connected to the hot water pool pipeline through the heat recovery pump. The high-temperature and high-pressure CO2 gas enters the heat recovery heat exchanger. In the heat recovery heat exchanger, the heat in the gas exchanges heat with the low-temperature water, and the water can be heated to 50-95 ℃, stored in the hot water pool under the circulation of the heat recovery pump; the heat recovery heat exchanger is connected to the CO2 cooler through the pipe b, and the CO2 cooler is installed sequentially on the output pipeline through the CO2 cooler pressure maintaining valve and CO2 The liquid throttling valve is connected to the CO2 low-pressure liquid receiver, and the supercooled CO2 gas is further cooled in the CO2 cooler, and the maximum efficiency is exerted under the action of the pressure maintenance valve of the CO2 cooler, and the CO2 is depressurized through the CO2 liquid throttling valve After cooling down, it enters the CO2 low-pressure liquid storage. The CO2 low-pressure liquid storage is connected to the ice rink pipeline heat exchanger in two ways, and one way is connected to the ice rink pipeline heat exchanger through the delivery pipeline. The CO2 low-pressure liquid storage is separated. The gas and the gas generated from the ice rink pipeline heat exchanger are sucked and compressed by the compressor; the other path of the CO2 low-pressure liquid receiver is connected to the ice rink pipeline heat exchanger through a liquid delivery pump, and the low-temperature and low-pressure liquid in the CO2 low-pressure liquid receiver is The CO2 liquid delivery pump transports it to the ice rink pipeline heat exchanger to absorb the heat of water and freeze the water into ice to complete the ice making process. 2. A pure CO2 ice rink refrigeration system according to claim 1, characterized in that a temperature sensor is also arranged in the outdoor ice rink. 3. A pure CO2 skating rink refrigeration system according to claim 1, characterized in that the CO2 low-pressure accumulator is connected to the CO2 low-pressure accumulator pressure maintaining unit.