A cold ammonia apparatus gas ammonia recovery device

Abstract

The utility model relates to gas ammonia recovery device technical field especially a cold ammonia ware gas ammonia recovery device, its characterized in that, the compressor export end is connected with the oil separator, the oil separator bottom is connected with the inlet end of liquid return pipe, the outlet end of liquid return pipe is fixedly connected with the compressor inlet end, the upper export of oil separator is connected with the inlet end of condenser, the outlet end of condenser is connected with the inlet end of liquid accumulator, the top of liquid accumulator is equipped with the pressure sensor for monitoring its internal gas pressure, the pressure sensor and external controller electric connection, the bottom outlet end of liquid accumulator is connected with the inlet end of drying filter, the outlet end of drying filter is connected with the inlet end of throttle expansion valve, the outlet end of throttle expansion valve is connected with the inlet end of evaporator, the outlet end of evaporator is connected with the inlet end of compressor.

Description

Technical Field

[0001] This utility model relates to the technical field of ammonia recovery devices, and in particular to an ammonia recovery device for a cold ammonia unit. Background Technology

[0002] Ammonia coolers, also known as ammonia condensers, are commonly used heat exchange devices in the production process of synthetic ammonia. During operation, they utilize the cooling capacity of liquid ammonia to lower the temperature of other media. Specifically, liquid ammonia is first heated and evaporated in an evaporator to become gaseous ammonia. The gaseous ammonia then sequentially enters the compressor and condenser to be recovered into liquid ammonia for recycling. In this process, when the gaseous ammonia flows through the condenser, sometimes it fails to completely liquefy and directly enters the next cycle with the system, which will have a certain impact on the refrigeration efficiency. To address this issue, this application proposes an ammonia recovery device for ammonia coolers. Utility Model Content

[0003] To address the above issues and overcome the shortcomings of existing technologies, this utility model provides an ammonia recovery device for ammonia refrigerants. The solution includes a compressor and an external controller. The compressor outlet is connected to an oil separator; the bottom of the oil separator is connected to the inlet of a return pipe; the outlet of the return pipe is fixedly connected to the compressor inlet; the upper outlet of the oil separator is connected to the inlet of a condenser; the outlet of the condenser is connected to the inlet of a liquid receiver; and a pressure sensor for monitoring the internal pressure is installed on the top of the liquid receiver. The pressure sensor is electrically connected to the external controller. The bottom outlet of the liquid receiver is connected to the inlet of the dryer filter, the outlet of the dryer filter is connected to the inlet of the throttling expansion valve, the outlet of the throttling expansion valve is connected to the inlet of the evaporator, the outlet of the evaporator is connected to the inlet of the compressor, the upper outlet of the liquid receiver is connected to the inlet of the first solenoid valve, the outlet of the first solenoid valve is connected to the inlet of the air pump, the outlet of the air pump is connected to the inlet of the second solenoid valve, the outlet of the second solenoid valve is connected to the inlet of the condenser, and the first solenoid valve, the second solenoid valve and the air pump are electrically connected to an external controller.

[0004] Preferably, a sight glass is connected in series between the drying filter and the throttling expansion valve.

[0005] The beneficial effects of this utility model are: During use, most of the gaseous ammonia will condense into liquid ammonia as it flows through the condenser and enter the liquid receiver for recycling. A small portion of the gaseous ammonia that fails to condense will also enter the liquid receiver. As the amount of gaseous ammonia in the liquid receiver gradually increases, the pressure in the liquid receiver will also increase. The pressure sensor monitors the pressure in the liquid receiver in real time and transmits the data to the external controller. When the pressure sensor detects that the pressure in the liquid receiver has reached the set value and transmits the data to the external controller, the external controller will control the first and second solenoid valves to open and start the air pump. The air pump will then draw gaseous ammonia from the liquid receiver and return it to the inlet of the condenser, allowing this portion of gaseous ammonia to re-enter the condenser for condensation and become liquid ammonia again. This prevents the uncondensed gaseous ammonia in the liquid receiver from participating in the circulation and affecting the refrigeration efficiency. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the main part of this utility model.

[0007] Figure Labels 1. Compressor, 2. Oil separator, 3. Return pipe, 4. Condenser, 5. Receiver, 6. Pressure sensor, 7. Dryer filter, 8. Throttling expansion valve, 9. Evaporator, 10. First solenoid valve, 11. Air pump, 12. Second solenoid valve, 13. Sight glass. Detailed Implementation

[0008] The following is in conjunction with the appendix Figure 1 The specific embodiments of this utility model will be described in further detail.

[0009] In the first embodiment, the technical solution is as follows: Specifically, the connection method of each component in this application is achieved by pipe connection, which will not be described in detail here.

[0010] In use, liquid ammonia evaporates into gaseous ammonia in evaporator 9 and then enters compressor 1 for compression. Compressor 1 compresses the ammonia from a low-temperature, low-pressure state to a high-temperature, high-pressure state. The compressed gaseous ammonia exits compressor 1 and enters oil separator 2. The oil separator returns the separated lubricating oil to compressor 1 via return pipe 3, while the gaseous ammonia enters condenser 4. In condenser 4, the gaseous ammonia releases heat and condenses into liquid ammonia, lowering its temperature. At this point, the medium-temperature, high-pressure liquid ammonia enters receiver 5. Receiver 5 stores a certain amount of liquid ammonia, regulating flow to adapt to load changes, and also separates... The ammonia gas that fails to condense in condenser 4 is ensured to be liquid ammonia leaving the receiver 5 and flowing to the dryer filter 7. The liquid ammonia leaving the receiver 5 flows to the dryer filter 7, where residual moisture and impurities are removed to prevent ice blockage and dirt blockage. The liquid ammonia flowing from the dryer filter 7 then flows sequentially through the sight glass 13 and the expansion valve 8. The expansion valve 8 throttles and reduces the pressure of the liquid ammonia, regulating its flow rate. After pressure reduction, the liquid ammonia becomes a low-temperature, low-pressure liquid, which then enters the evaporator 9 to absorb heat and evaporate, changing from liquid to gas. It then returns to the compressor 1, repeating the above process. The indoor evaporator 9 continuously absorbs heat, while the outdoor condenser 4 continuously releases heat, thus achieving a cooling effect.

[0011] In the aforementioned cycle, medium-temperature, high-pressure liquid ammonia enters the storage tank 5. The storage tank 5 stores a certain amount of liquid ammonia, regulating the flow rate to adapt to load changes. Simultaneously, it separates gaseous ammonia that has not been condensed by the condenser 4, ensuring that only liquid ammonia leaves the storage tank 5 and flows to the dryer filter 7. To prevent the accumulation of gaseous ammonia in the storage tank 5 that has not been condensed by the condenser 4, which could then invade the liquid ammonia and participate in the cycle, and to prevent excessive accumulation of gaseous ammonia in the storage tank 5 that could affect the system's pressure balance, an external controller and a gas pump 11 are installed to recover this portion of gaseous ammonia to the condenser 4 for secondary condensation. Specifically, as the amount of gaseous ammonia in the storage tank 5 gradually increases, the pressure in the storage tank 5 also increases. The pressure sensor 6 monitors the pressure in real time. The pressure in the reservoir 5 is monitored and transmitted to the external controller. When the pressure sensor 6 detects that the gas pressure in the reservoir 5 reaches the set warning threshold and transmits it to the external controller, the external controller will control the first solenoid valve 10 and the second solenoid valve 12 to open and start the air pump 11. The air pump 11 will then draw gaseous ammonia from the reservoir 5 and return it to the inlet of the condenser 4, so that this part of the gaseous ammonia will re-enter the condenser 4 for condensation and become liquid ammonia. As the air pump 11 delivers gas, when the gas pressure in the reservoir 5 returns to the set minimum safety threshold, the pressure sensor 6 transmits this information to the external controller, which will then control the first solenoid valve 10 and the second solenoid valve 12 to close and simultaneously control the air pump 11 to stop running.

[0012] In Example 2, based on Example 1, a sight glass 13 is provided to facilitate observation of the state of liquid ammonia flowing in the pipeline. At the same time, the sight glass 13 can also detect and display the water vapor content in the liquid ammonia.

Claims

1. A cold ammonia gas ammonia recovery device, comprising a compressor (1) and an external controller, characterized in that, The compressor (1) has an oil separator (2) connected to its outlet end. The bottom of the oil separator (2) is connected to the inlet end of a return pipe (3). The outlet end of the return pipe (3) is fixedly connected to the inlet end of the compressor (1). The upper outlet of the oil separator (2) is connected to the inlet end of a condenser (4). The outlet end of the condenser (4) is connected to the inlet end of a liquid receiver (5). A pressure sensor (6) for monitoring the internal air pressure is installed on the top of the liquid receiver (5). The pressure sensor (6) is electrically connected to an external controller. The bottom outlet end of the liquid receiver (5) is connected to the inlet end of a dryer filter (7). The outlet end of the dryer filter (7) is connected to a throttling device. The inlet end of the expansion valve (8) is connected to the outlet end of the expansion valve (8), which is connected to the inlet end of the evaporator (9). The outlet end of the evaporator (9) is connected to the inlet end of the compressor (1). The outlet end of the upper part of the liquid receiver (5) is connected to the inlet end of the first solenoid valve (10). The outlet end of the first solenoid valve (10) is connected to the inlet end of the air pump (11). The outlet end of the air pump (11) is connected to the inlet end of the second solenoid valve (12). The outlet end of the second solenoid valve (12) is connected to the inlet end of the condenser (4). The first solenoid valve (10), the second solenoid valve (12) and the air pump (11) are electrically connected to an external controller.

2. The ammonia recovery device for a cold ammonia generator according to claim 1, characterized in that, A sight glass (13) is also connected in series between the dryer filter (7) and the throttling expansion valve (8).

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