Non-condensable gas venting system and venting control method

Abstract

The application discloses a non-condensable gas discharging system and a discharging control method. The non-condensable gas discharging system comprises a first separation unit and a second separation unit. The first separation unit and the second separation unit are arranged in series. The first separation unit is used for receiving mixed gas containing non-condensable gas of a refrigeration system and completing first separation based on a physical inertia collision mechanism. The second separation unit is used for receiving mixed gas containing non-condensable gas separated by the first separation unit and completing second separation based on a temperature-controlled phase change mechanism. An exhaust end is formed in the second separation unit and is used for discharging the non-condensable gas. The discharging control method is established according to the system. The non-condensable gas discharging system and the discharging control method are set up according to the principle of simplifying structure and setting but achieving sufficient discharging of the non-condensable gas. The non-condensable gas can be fully separated and discharged at a high cost performance ratio.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration systems, specifically relating to a non-condensable gas emission system and emission control method. Background Technology

[0002] With rapid economic development, refrigeration equipment plays an increasingly important role in food storage and transportation. However, improper management and maintenance of refrigeration systems can lead to the introduction of non-condensable gases. Non-condensable gases generally refer to those mixed in with the refrigeration system, such as ammonia, air, nitrogen, rare gases, and lubricating oil vapor. These gases circulate with the refrigerant in the system, but they do not reach their boiling points under the current operating pressure and temperature. Therefore, they neither condense nor evaporate with the refrigerant and do not produce a cooling effect. This poses a significant threat to the system. In terms of process technology, this manifests primarily as increased condenser pressure and increased exhaust superheat. Higher superheat indicates a greater amount of non-condensable gas, resulting in poorer evaporator performance.

[0003] Utility model application CN201420259450.8 discloses "a non-condensable gas emission system for an ammonia power generation system", which includes a condenser, a hot well, an ammonia working fluid storage tank, and an absorption tank. The hot well is located below the condenser and includes an upper gas phase zone and a lower liquid phase zone. The liquid phase zone of the hot well is connected to the ammonia working fluid storage tank through a drain pipe, and the gas phase zone of the hot well is connected to the absorption medium of the absorption tank through an exhaust pipe. An exhaust valve is provided at the top of the absorption tank, and the bottom of the absorption tank is connected to the ammonia working fluid storage tank through a liquid delivery pipe.

[0004] The utility model application with application number CN201620478619.8 discloses "a shell-side non-condensable gas emission device for a tubular distillation water machine". The shell has a shell side and a tube side distributed inside the shell. An exhaust pipe is connected to the N-position at the upper part of the shell side. The N-position of the shell side is the connection point between the upper tube sheet and the shell side.

[0005] Application number CN201820707014.0 discloses "a plate condenser capable of emitting non-condensable gases", including a rear fixed end plate, heat exchange plates, a front fixed end plate, a gaseous refrigerant inlet, a liquid refrigerant outlet, a cooling water outlet, a cooling water inlet, a cooling water outlet channel, a cooling water inlet channel, a gaseous refrigerant channel, and a liquid refrigerant channel; the rear fixed end plate and the last sealing heat exchange plate closely attached to the rear fixed end plate have communicating non-condensable gas emission ports, the non-condensable gas emission ports are located at the very end of the gaseous refrigerant channel and the diameter of the non-condensable gas emission port is smaller than the diameter of the gaseous refrigerant channel. Summary of the Invention

[0006] To address the above problems, this invention provides a non-condensable gas emission system and emission control method, the specific technical solution of which is as follows:

[0007] A non-condensable gas emission system for emitting non-condensable gases from a refrigeration system, characterized by comprising:

[0008] The primary separation unit and the secondary separation unit are configured.

[0009] The primary separation unit and the secondary separation unit are arranged in series;

[0010] in,

[0011] The primary separation unit is used to receive the mixed gas containing non-condensable gases from the refrigeration system and complete the primary separation based on the physical inertial collision mechanism.

[0012] The secondary separation unit is used to receive the mixed gas containing non-condensable gases after separation by the primary separation unit, and to complete the secondary separation based on the temperature-controlled phase change mechanism.

[0013] An exhaust end is formed in the secondary separation unit, which is used to discharge non-condensable gases.

[0014] According to the present invention, a non-condensable gas emission system is characterized in that:

[0015] The temperature control is specifically energy exchange, and the cold source for energy exchange is provided by the refrigeration system.

[0016] According to the present invention, a non-condensable gas emission system is characterized in that:

[0017] The secondary separation unit is also equipped with a drain end, a gas return end, and an internal circulation unit.

[0018] The return gas end pipe is connected to the refrigerant pipe of the refrigeration system;

[0019] The internal circulation unit is formed between the drain end and the inlet end of the secondary separation unit, and is used to provide a temperature-controlled internal circulation cold source to the secondary separation unit in a controlled manner, thereby achieving sufficient separation in the secondary separation unit and reducing the supply of cold source to the refrigeration system, thus saving resources.

[0020] According to the present invention, a non-condensable gas emission system is characterized in that:

[0021] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit is also provided in the secondary separation unit;

[0022] The mixed gas containing non-condensable gases, after being separated by the primary separation unit, is then processed by the pressure detection unit and the pressurized circulation unit before being discharged into the secondary separation unit.

[0023] According to the present invention, a non-condensable gas emission system is characterized in that:

[0024] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit and an exhaust detection unit are also provided in the secondary separation unit;

[0025] The mixed gas containing non-condensable gases, after being separated by the primary separation unit, is then processed by the pressure detection unit and the pressurized circulation unit before being discharged into the secondary separation unit.

[0026] The mixed gas discharged into the secondary separation unit is processed by the exhaust detection unit and the pressurized circulation unit before being discharged as non-condensable gas.

[0027] According to the present invention, a non-condensable gas emission system is characterized in that:

[0028] The primary separation unit also includes a cold source for energy exchange in the secondary separation unit;

[0029] The heat source is liquid refrigerant separated by a primary separation unit (to fully utilize the separated refrigerant, thereby reducing the supply of cold source to the refrigeration system and saving resources).

[0030] According to the present invention, a non-condensable gas emission system is characterized in that:

[0031] The cold source is a cold refrigerant provided by the refrigerant system in the refrigeration system.

[0032] A method for controlling the emission of non-condensable gases in a refrigeration system, characterized in that:

[0033] The emission control method is established for emission systems.

[0034] The emission system is provided with a primary separation unit and a secondary separation unit connected in series.

[0035] The primary separation unit is connected to the mixed gas discharge port of the refrigeration system, and a non-condensable gas exhaust end is formed in the secondary separation unit; the emission control method accordingly includes the following steps:

[0036] S1: The mixed gas containing non-condensable gases is discharged to the primary separation unit via the refrigeration system;

[0037] S2: The mixed gas after primary separation by the primary separation unit is discharged to the secondary separation unit, while the refrigerant system of the refrigeration system is controlled to discharge liquid refrigerant to the secondary separation unit;

[0038] S3: The refrigerant discharged to the secondary separation unit via the refrigerant system exchanges temperature with the mixed gas discharged to the secondary separation unit after primary separation. The secondary separation is completed through temperature exchange, and non-condensable gas is discharged.

[0039] According to the present invention, an emission control method for a non-condensable gas emission system is characterized in that:

[0040] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit is also provided in the secondary separation unit.

[0041] In step S2, the mixed gas after primary separation by the primary separation unit is processed by the pressure detection unit and the pressurization circulation unit before being discharged into the secondary separation unit. Specifically, the steps include the following:

[0042] S21: The pressure of the mixed gas after primary separation is detected in real time by the pressure detection unit. If the detected value is greater than or equal to the set pressure value, proceed to step S23; otherwise, proceed to step S22.

[0043] S22: Start the pressurization circulation unit, discharge the mixed gas entering the secondary separation unit and the mixed gas after the primary separation to the pressurization end of the pressurization circulation unit, and discharge the mixed gas after pressurization at the pressurization end to the secondary separation unit, thus forming a pressurization cycle; repeat the pressurization cycle until the detection value of the pressure detection unit is greater than or equal to the set pressure value, shut down the pressurization circulation unit, and proceed to step S23;

[0044] S23: Discharge the mixed gas to the secondary separation unit for secondary separation.

[0045] According to the present invention, an emission control method for a non-condensable gas emission system is characterized in that:

[0046] The secondary separation unit is also equipped with a drain end and an internal circulation unit.

[0047] The internal circulation unit is formed between the drain end and the air inlet end of the secondary separation unit, and is used to provide a controlled internal circulation cold source for energy exchange to the secondary separation unit, specifically:

[0048] If the liquid storage capacity of the internal circulation unit reaches the set value, the pipeline from the internal circulation unit to the air inlet of the secondary separation unit will be opened; otherwise, it will be closed.

[0049] According to the present invention, an emission control method for a non-condensable gas emission system is characterized in that:

[0050] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and an exhaust gas detection unit is also provided in the secondary separation unit.

[0051] In step S3, the mixed gas discharged into the secondary separation unit, after completing temperature exchange, is processed by the exhaust detection unit and the pressurized circulation unit before being discharged as non-condensable gas. Specifically:

[0052] S31: The liquid level in the secondary separation unit is monitored in real time via the exhaust detection unit;

[0053] S32: If no liquid is detected in the secondary separation unit, the pressurization circulation unit is activated according to the set time. The mixed gas entering the secondary separation unit and the mixed gas after the primary separation are discharged to the pressurization end of the pressurization circulation unit. The mixed gas after being pressurized at the pressurization end is then discharged to the secondary separation unit, thus forming a pressurization cycle. The pressurization cycle is repeated until the set time ends.

[0054] S33: Shut down the pressurized circulation unit and discharge non-condensable gases.

[0055] According to the present invention, an emission control method for a non-condensable gas emission system is characterized in that:

[0056] In step S2, after the first-stage separation is completed by the first-stage separation unit, refrigerant liquid is formed and stored in the liquid storage end of the first-stage separation unit.

[0057] To address this, a refrigerant liquid level monitoring unit and a cold source supply pipeline for the primary separation unit are also included.

[0058] The cold source supply pipeline of the primary separation unit is connected between the liquid storage end of the primary separation unit and the liquid inlet end of the secondary separation unit;

[0059] If the refrigerant liquid level monitoring unit detects that the formed refrigerant liquid has reached the set amount, it will open the cold source supply pipeline of the first-stage separation unit to provide a cold source for energy exchange from the first-stage separation unit to the second-stage separation unit; otherwise, it will close the cold source supply pipeline of the first-stage separation unit.

[0060] This invention discloses a non-condensable gas emission system and emission control method, designed to simplify structure and setup while saving costs, yet achieving full emission of non-condensable gases. It aims to provide a cost-effective emission system with a simple structure suitable for various applications, achieving both sufficient separation and full utilization. Based on the guiding principles of this invention, for the separation of mixtures, it fully utilizes the different physical properties and phase change characteristics of different substances, constructing a primary separation based on inertial collisions and a phase change separation based on energy exchange, thereby completing the entire separation process. Furthermore, the heat source for the phase change separation that completes temperature exchange is provided by the refrigerant system of the refrigeration system, achieving cost self-utilization within the system; saving costs and simplifying the system structure. To further achieve sufficient separation and full utilization within the system, an internal circulation unit, a pressure detection unit, and an exhaust detection unit are respectively set in the secondary separation unit; a refrigerant liquid level monitoring unit and a heat source supply pipeline for the primary separation unit are set in the primary separation unit; and a pressurized circulation unit is set between the secondary and primary separation units.

[0061] The refrigerant liquid level monitoring unit and the heat source supply pipeline of the primary separation unit work together to enable the refrigerant liquid formed in the primary separation to form a cold source for temperature exchange in the secondary separation. This achieves full utilization of the refrigerant while reducing the amount of refrigerant required in the refrigerant system.

[0062] The internal circulation unit, while achieving sufficient separation within the secondary separation unit, reduces the refrigerant supply to the refrigerant system, thus saving costs.

[0063] The pressure detection unit works in conjunction with the pressurization circulation unit to monitor and pressurize the mixed gas containing non-condensable gases after the primary separation unit, thereby enhancing the separation effect of the secondary separation.

[0064] The exhaust detection unit works in conjunction with the pressurization and circulation unit to establish monitoring of the exhaust before the exhaust from the secondary separation unit, ensuring smooth exhaust. Attached Figure Description

[0065] Figure 1 This is a structural block diagram of the present invention;

[0066] Figure 2 This is a schematic diagram of the system structure in an embodiment of the present invention;

[0067] Figure 3 This is a schematic diagram of the steps of the emission control method in this invention;

[0068] Figure 4 This is a schematic diagram illustrating the collaborative steps of the pressurization cycle unit and the pressure detection unit in the emission control method of the present invention.

[0069] Figure 5 This is a schematic diagram illustrating the collaborative steps of the pressurization cycle unit and the exhaust gas detection unit in the emission control method of the present invention. Detailed Implementation

[0070] The following is a further detailed description of a non-condensable gas emission system and emission control method of the present invention, with reference to the accompanying drawings and specific embodiments.

[0071] like Figure 1 , 2 The non-condensable gas emission system shown is used to emit non-condensable gases from a refrigeration system, and includes:

[0072] The primary separation unit and the secondary separation unit are configured.

[0073] The primary separation unit and the secondary separation unit are arranged in series;

[0074] in,

[0075] The primary separation unit is used to receive the mixed gas containing non-condensable gases from the refrigeration system and complete the primary separation based on the physical inertial collision mechanism.

[0076] The secondary separation unit is used to receive the mixed gas containing non-condensable gases after separation by the primary separation unit, and to complete the secondary separation based on the temperature-controlled phase change mechanism.

[0077] An exhaust end is formed in the secondary separation unit, which is used to discharge non-condensable gases.

[0078] in,

[0079] The temperature control is specifically energy exchange, and the cold source for energy exchange is provided by the refrigeration system.

[0080] in,

[0081] The secondary separation unit is also equipped with a drain end, a gas return end, and an internal circulation unit.

[0082] The return gas end pipe is connected to the refrigerant pipe of the refrigeration system;

[0083] The internal circulation unit is formed between the drain end and the inlet end of the secondary separation unit, and is used to provide a temperature-controlled internal circulation cold source to the secondary separation unit in a controlled manner, thereby achieving sufficient separation in the secondary separation unit and reducing the supply of cold source to the refrigeration system, thus saving resources.

[0084] in,

[0085] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit is also provided in the secondary separation unit;

[0086] The mixed gas containing non-condensable gases, after being separated by the primary separation unit, is then processed by the pressure detection unit and the pressurized circulation unit before being discharged into the secondary separation unit.

[0087] in,

[0088] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit and an exhaust detection unit are also provided in the secondary separation unit;

[0089] The mixed gas containing non-condensable gases, after being separated by the primary separation unit, is then processed by the pressure detection unit and the pressurized circulation unit before being discharged into the secondary separation unit.

[0090] The mixed gas discharged into the secondary separation unit is processed by the exhaust detection unit and the pressurized circulation unit before being discharged as non-condensable gas.

[0091] in,

[0092] The primary separation unit also includes a cold source for energy exchange in the secondary separation unit;

[0093] The heat source is liquid refrigerant separated by a primary separation unit (to fully utilize the separated refrigerant, thereby reducing the supply of cold source to the refrigeration system and saving resources).

[0094] in,

[0095] The cold source is a cold refrigerant provided by the refrigerant system in the refrigeration system.

[0096] A method for controlling the emission of non-condensable gases in a refrigeration system, used to control the separation and emission of non-condensable gases from the refrigeration system.

[0097] The emission control method is established for emission systems.

[0098] The emission system is provided with a primary separation unit and a secondary separation unit connected in series.

[0099] The primary separation unit is connected to the mixed gas exhaust port of the refrigeration system, and a non-condensable gas exhaust port is formed in the secondary separation unit; the emission control method accordingly is as follows: Figure 3 As shown, it includes the following steps:

[0100] S1: The mixed gas containing non-condensable gases is discharged to the primary separation unit via the refrigeration system;

[0101] S2: The mixed gas after primary separation by the primary separation unit is discharged to the secondary separation unit, while the refrigerant system of the refrigeration system is controlled to discharge liquid refrigerant to the secondary separation unit;

[0102] S3: The refrigerant discharged to the secondary separation unit via the refrigerant system exchanges temperature with the mixed gas discharged to the secondary separation unit after primary separation. The secondary separation is completed through temperature exchange, and non-condensable gas is discharged.

[0103] in,

[0104] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit is also provided in the secondary separation unit.

[0105] In step S2, the mixed gas after primary separation by the primary separation unit is processed by the pressure detection unit and the pressurization circulation unit before being discharged into the secondary separation unit. Figure 4 As shown, the specific steps include the following:

[0106] S21: The pressure of the mixed gas after primary separation is detected in real time by the pressure detection unit. If the detected value is greater than or equal to the set pressure value, proceed to step S23; otherwise, proceed to step S22.

[0107] S22: Start the pressurization circulation unit, discharge the mixed gas entering the secondary separation unit and the mixed gas after the primary separation to the pressurization end of the pressurization circulation unit, and discharge the mixed gas after pressurization at the pressurization end to the secondary separation unit, thus forming a pressurization cycle; repeat the pressurization cycle until the detection value of the pressure detection unit is greater than or equal to the set pressure value, shut down the pressurization circulation unit, and proceed to step S23;

[0108] S23: Discharge the mixed gas to the secondary separation unit for secondary separation.

[0109] in,

[0110] The secondary separation unit is also equipped with a drain end and an internal circulation unit.

[0111] The internal circulation unit is formed between the drain end and the air inlet end of the secondary separation unit, and is used to provide a controlled internal circulation cold source for energy exchange to the secondary separation unit, specifically:

[0112] If the liquid storage capacity of the internal circulation unit reaches the set value, the pipeline from the internal circulation unit to the air inlet of the secondary separation unit will be opened; otherwise, it will be closed.

[0113] in,

[0114] A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and an exhaust gas detection unit is also provided in the secondary separation unit.

[0115] In step S3, the mixed gas discharged into the secondary separation unit, after completing temperature exchange, is processed by the exhaust detection unit and the pressurized circulation unit before the non-condensable gas is discharged, such as... Figure 5 As shown, specifically:

[0116] S31: The liquid level in the secondary separation unit is monitored in real time via the exhaust detection unit;

[0117] S32: If no liquid is detected in the secondary separation unit, the pressurization circulation unit is activated according to the set time. The mixed gas entering the secondary separation unit and the mixed gas after the primary separation are discharged to the pressurization end of the pressurization circulation unit. The mixed gas after being pressurized at the pressurization end is then discharged to the secondary separation unit, thus forming a pressurization cycle. The pressurization cycle is repeated until the set time ends.

[0118] S33: Shut down the pressurized circulation unit and discharge non-condensable gases.

[0119] in,

[0120] In step S2, after the first-stage separation is completed by the first-stage separation unit, refrigerant liquid is formed and stored in the liquid storage end of the first-stage separation unit.

[0121] To address this, a refrigerant liquid level monitoring unit and a cold source supply pipeline for the primary separation unit are also included.

[0122] The cold source supply pipeline of the primary separation unit is connected between the liquid storage end of the primary separation unit and the liquid inlet end of the secondary separation unit;

[0123] If the refrigerant liquid level monitoring unit detects that the formed refrigerant liquid has reached the set amount, it will open the cold source supply pipeline of the first-stage separation unit to provide a cold source for energy exchange from the first-stage separation unit to the second-stage separation unit; otherwise, it will close the cold source supply pipeline of the first-stage separation unit.

[0124] Working process, principle and implementation examples

[0125] like Figure 1 , 2 As shown, the details are as follows:

[0126] A non-condensable gas discharge pipeline is led from the refrigeration system to the gas-liquid separator (i.e., the primary separation unit mentioned above). A PLC, in conjunction with a pressure sensor, establishes real-time pressure monitoring of the gas-liquid separator. The purpose of this monitoring is to control the pressure of the mixture entering the cooler (i.e., the secondary separation unit mentioned above), thereby improving the separation effect of the secondary separation. This control is achieved through the compressor (i.e., the pressurization end of the pressurization cycle unit mentioned above). A pressure sensor (i.e., the pressure detection unit mentioned above) is used to detect the gas pressure inside the compressor in real time. The compressor is connected between the gas-liquid separator and the cooler, and is connected to the compressor's inlet end through the cooler's drain pipe. A switch valve is installed on the pipeline. This configuration constitutes the pressurization cycle unit mentioned above. When the pressure detected by the pressure sensor is less than the set value, the switch valve is opened, forming a passage between the cooler and the compressor. The switch valve is closed when the pressure detected by the pressure sensor is greater than or equal to the set value.

[0127] The refrigerant system of the self-refrigeration system leads out a refrigerant pipeline. The refrigerant in the pipeline is introduced into the cooler as a low-temperature medium for cooling. In the cooler, through heat exchange between the introduced low-temperature medium and the mixture separated from the first stage, the gas-liquid two-phase separation of the gas mixture is completed by utilizing the characteristic that non-condensable gases cannot be cooled into liquids, thereby completing the second-stage separation.

[0128] The system also includes a storage tank and corresponding pipelines, along with a liquid level monitoring system, forming the aforementioned internal circulation unit. The inlet of the storage tank is connected to the outlet of the cooler via a pipeline, and the outlet of the storage tank is connected to the inlet of the cooler via a pipeline. A throttling valve and a regulating valve are installed on these pipelines. The throttling valve acts as a flow restrictor and pressure reducer, while the regulating valve works in conjunction with the thermosiphon effect structure described below. When the liquid level reaches a set value, the pipeline connecting the storage tank to the cooler inlet is opened, allowing the liquid in the storage tank to act as a cold source for energy exchange; otherwise, the pipeline remains closed. The liquid level in the storage tank is monitored using a liquid level sensor in conjunction with a PLC.

[0129] Among them, such as Figure 2 As shown, a return gas pipeline from the cooler to the refrigeration system is also provided.

[0130] Simultaneously, an emission trigger standard is set for the cooler's exhaust, which is achieved by detecting the presence of liquid in the cooler through an exhaust detection unit (specifically, a liquid level sensor). When no liquid is detected in the cooler, the internal circulation unit runs for a set time until the set time is completed, at which point the internal circulation unit is closed and the exhaust is initiated. Furthermore, to fully utilize the system's resources, a primary separation unit heat source supply pipeline is installed between the gas-liquid separator and the cooler's inlet. A liquid level sensor (i.e., the refrigerant liquid level monitoring unit mentioned above) located within the gas-liquid separator monitors the liquid level in the gas-liquid separator in real time. When the liquid level accumulates to a set value, the primary separation unit liquid refrigerant supply pipeline is opened, allowing the gas-liquid separator to provide a heat source for temperature exchange to the cooler.

[0131] This invention discloses a non-condensable gas emission system and emission control method, designed to simplify structure and setup while saving costs, yet achieving full emission of non-condensable gases. It aims to provide a cost-effective emission system with a simple structure suitable for various applications, achieving both sufficient separation and full utilization. Based on the guiding principles of this invention, for the separation of mixtures, it fully utilizes the different physical properties and phase change characteristics of different substances, constructing a primary separation based on inertial collisions and a phase change separation based on energy exchange, thereby completing the entire separation process. Furthermore, the heat source for the phase change separation that completes temperature exchange is provided by the refrigerant system of the refrigeration system, achieving cost self-utilization within the system; saving costs and simplifying the system structure. To further achieve sufficient separation and full utilization within the system, an internal circulation unit, a pressure detection unit, and an exhaust detection unit are respectively set in the secondary separation unit; a refrigerant liquid level monitoring unit and a heat source supply pipeline for the primary separation unit are set in the primary separation unit; and a pressurized circulation unit is set between the secondary and primary separation units.

[0132] The refrigerant liquid level monitoring unit and the heat source supply pipeline of the primary separation unit work together to enable the refrigerant liquid formed in the primary separation to form a cold source for temperature exchange in the secondary separation. This achieves full utilization of the refrigerant while reducing the amount of refrigerant required in the refrigerant system.

[0133] The internal circulation unit, while achieving sufficient separation within the secondary separation unit, reduces the refrigerant supply to the refrigerant system, thus saving costs.

[0134] The pressure detection unit works in conjunction with the pressurization circulation unit to monitor and pressurize the mixed gas containing non-condensable gases after the primary separation unit, thereby enhancing the separation effect of the secondary separation.

[0135] The exhaust detection unit works in conjunction with the pressurization and circulation unit to establish monitoring of the exhaust before the exhaust from the secondary separation unit, ensuring smooth exhaust.

Claims

1. A method for controlling the emission of non-condensable gases in a refrigeration system, used to control the separation and emission of non-condensable gases in the refrigeration system, characterized in that: The emission control method is established for emission systems. The emission system is provided with a primary separation unit and a secondary separation unit connected in series. The primary separation unit is connected to the mixed gas discharge port of the refrigeration system, and a non-condensable gas exhaust end is formed in the secondary separation unit; the emission control method includes the following steps: S1: The mixed gas containing non-condensable gases is discharged to the primary separation unit via the refrigeration system; S2: The mixed gas after primary separation by the primary separation unit is discharged to the secondary separation unit, while the refrigerant system of the refrigeration system is controlled to discharge liquid refrigerant to the secondary separation unit; S3: The refrigerant discharged to the secondary separation unit via the refrigerant system exchanges temperature with the mixed gas discharged to the secondary separation unit after primary separation. The secondary separation is completed through temperature exchange and non-condensable gas is discharged. A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit is also provided in the secondary separation unit. In step S2, the mixed gas after primary separation by the primary separation unit is processed by the pressure detection unit and the pressurization circulation unit before being discharged into the secondary separation unit. Specifically, the steps include the following: S21: The pressure of the mixed gas after primary separation is detected in real time by the pressure detection unit. If the detected value is greater than or equal to the set pressure value, proceed to step S23; otherwise, proceed to step S22. S22: Start the pressurization circulation unit, discharge the mixed gas entering the secondary separation unit and the mixed gas after the primary separation to the pressurization end of the pressurization circulation unit, and discharge the mixed gas after pressurization at the pressurization end to the secondary separation unit, thus forming a pressurization cycle; repeat the pressurization cycle until the detection value of the pressure detection unit is greater than or equal to the set pressure value, shut down the pressurization circulation unit, and proceed to step S23; S23: Discharge the mixed gas to the secondary separation unit for secondary separation; The secondary separation unit is also equipped with a drain end and an internal circulation unit. The internal circulation unit is formed between the drain end and the inlet end of the secondary separation unit, and is used to provide a controlled internal circulation cold source for energy exchange to the secondary separation unit, specifically: If the liquid storage capacity of the internal circulation unit reaches the set value, the pipeline from the internal circulation unit to the liquid inlet of the secondary separation unit will be opened; otherwise, it will be closed. In step S2 above, after the first-stage separation is completed by the first-stage separation unit, refrigerant liquid is formed and stored in the liquid storage end of the first-stage separation unit. It also includes a refrigerant liquid level monitoring unit and a cold source supply pipeline for the primary separation unit. The refrigerant liquid level monitoring unit is located within the primary separation unit. The cold source supply pipeline of the primary separation unit is connected between the liquid storage end of the primary separation unit and the liquid inlet end of the secondary separation unit; If the refrigerant liquid level monitoring unit detects that the formed refrigerant liquid has reached the set amount, it will open the cold source supply pipeline of the first-stage separation unit to provide a cold source for energy exchange from the first-stage separation unit to the second-stage separation unit; otherwise, it will close the cold source supply pipeline of the first-stage separation unit.

2. The emission control method for a non-condensable gas emission system according to claim 1, characterized in that: The secondary separation unit is also equipped with an exhaust gas detection unit. In step S3, the mixed gas discharged into the secondary separation unit, after completing temperature exchange, is processed by the exhaust detection unit and the pressurized circulation unit before being discharged as non-condensable gas. Specifically: S31: The liquid level in the secondary separation unit is monitored in real time via the exhaust detection unit; S32: If no liquid is detected in the secondary separation unit, the pressurization circulation unit is activated according to the set time. The mixed gas entering the secondary separation unit and the mixed gas after the primary separation are discharged to the pressurization end of the pressurization circulation unit. The mixed gas after being pressurized at the pressurization end is then discharged to the secondary separation unit, thus forming a pressurization cycle. The pressurization cycle is repeated until the set time ends. S33: Shut down the pressurized circulation unit and discharge non-condensable gases.

3. A non-condensable gas emission system for use in the emission control method of the non-condensable gas emission system according to claim 1 or 2, for emitting non-condensable gases from a refrigeration system, characterized in that... Including: The primary separation unit and the secondary separation unit are configured. The primary separation unit and the secondary separation unit are arranged in series; in, The primary separation unit is used to receive the mixed gas containing non-condensable gases from the refrigeration system and complete the primary separation based on the physical inertial collision mechanism. The secondary separation unit is used to receive the mixed gas containing non-condensable gases after separation by the primary separation unit, and to complete the secondary separation based on the temperature-controlled phase change mechanism. A non-condensable gas exhaust end is formed in the secondary separation unit, and the non-condensable gas exhaust end is used to discharge non-condensable gases; A pressurized circulation unit is provided between the secondary separation unit and the primary separation unit, and a pressure detection unit is also provided in the secondary separation unit; The mixed gas containing non-condensable gases, after being separated by the primary separation unit, is then processed by the pressure detection unit and the pressurized circulation unit before being discharged into the secondary separation unit. The primary separation unit also includes a cold source for energy exchange in the secondary separation unit.

4. A non-condensable gas emission system according to claim 3, characterized in that: The secondary separation unit is also equipped with a drain end, a gas return end, and an internal circulation unit. The return gas end is connected to the refrigerant pipeline of the refrigeration system via a pipeline; The internal circulation unit is formed between the drain end and the inlet end of the secondary separation unit, and is used to provide the secondary separation unit with an internal circulation cold source for energy exchange in a controlled manner.

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