Dry gas seal liquid remover device of ammonia compressor

Abstract

The utility model discloses a dry gas seal liquid remover device of an ammonia compressor, which relates to the field of dry gas seal and is characterized by comprising a liquid removing tank, a wire mesh demister, a cooling device and a first valve, the cooling device is used for reducing the temperature in the liquid removal tank; the wire mesh demister is detachably connected in the liquid removal tank and divides the interior of the liquid removal tank into an upper space and a lower space; an air inlet, an air outlet and a liquid outlet are formed in the liquid removal tank, the air inlet is communicated with the space below the wire mesh demister, and the air outlet and the liquid outlet are both communicated with the space above the wire mesh demister; the liquid outlet is formed in the bottom of the liquid removal tank, and the first valve is mounted at the liquid outlet. Process gas is condensed and filtered, a large amount of liquid and solid particles in the process gas are removed, and the problem that primary sealing gas of dry gas sealing carries liquid is solved.

Description

Technical Field

[0001] The utility model relates to the field of dry gas sealing, and more specifically to a dry gas sealing deliquifier device for an ammonia compressor. Background Art

[0002] Ammonia compressors are widely used in chemical plants such as ammonia synthesis, methanol synthesis and air separation. The principle is to compress the evaporated ammonia gas from the ammonia cooler to a certain pressure through the compressor, and then cool the high-pressure gas ammonia into liquid ammonia through the cooler. As an important component of the ammonia compressor, the dry gas seal is crucial to the safe and stable operation of the ammonia compressor.

[0003] At present, the primary sealing gas of the dry gas seal of the ammonia compressor during normal operation is mainly provided by the process gas at the compressor outlet. During the operation of the compressor, the compressor often encounters problems such as a large amount of water vapor in the intake air, lubricating oil leakage, insufficient cooling, etc., which often cause water and oil to appear in the process gas at the compressor outlet. This phenomenon often causes the filter element of the dry gas seal to be blocked, resulting in an increase in the pressure difference in the dry gas seal. In severe cases, water and oil in the process gas will enter the dry gas seal and damage the dry gas seal.

[0004] Therefore, the dry gas seal field needs to develop a liquid removal device for the compressor outlet process gas to solve the problem of liquid in the first-level sealing gas of the dry gas seal. Utility Model Content

[0005] In response to the problem of liquid in the first-level sealing gas of the dry gas seal, the utility model provides the following technical solutions: an ammonia compressor dry gas seal deliquidator device, which includes a deliquidation tank, a wire mesh demister, a cooling device and a first valve; the cooling device is used to reduce the temperature in the deliquidation tank; the wire mesh demister is detachably connected to the deliquidation tank to separate the deliquidation tank into two upper and lower spaces; the deliquidation tank is provided with an air inlet, an air outlet and a drain port, the air inlet is connected to the space below the wire mesh demister, and the air outlet and the drain port are both connected to the space above the wire mesh demister; the drain port is located at the bottom of the deliquidation tank, and the first valve is installed at the drain port.

[0006] The utility model is further configured to include a differential pressure transmitter, wherein the differential pressure transmitter is used to detect the pressure difference between the air inlet and the air outlet.

[0007] The utility model is further configured to include a liquid level transmitter, which is arranged in the deliquidation tank to detect the liquid level in the deliquidation tank.

[0008] The utility model is further configured as follows: the first valve is an electrically controlled valve, and the liquid level transmitter is connected to the electrically controlled valve signal; when the liquid level transmitter detects that the liquid level in the deliquidation tank reaches a set maximum height, the electrically controlled valve opens; when the liquid level transmitter detects that the liquid level in the deliquidation tank is lower than a set minimum height, the electrically controlled valve closes.

[0009] The utility model is further configured to include: a second valve and a third valve, both of which are manually controlled valves; the second valve is connected to the discharge port, and the second valve is normally closed; the third valve is installed between the electric control valve and the discharge port, and the third valve is normally open.

[0010] The utility model is further configured to include an alarm device, which is used to send out an alarm signal when the liquid level transmitter detects that the liquid level in the deliquidation tank reaches a set maximum height, and the alarm signal is at least one of a sound signal and a light signal.

[0011] The utility model is further configured as follows: the liquid level transmitter is a magnetic flap liquid level transmitter.

[0012] The utility model is further configured as follows: the cooling device is a coil surrounded by the outside of the deliquidation tank, and the inside of the coil is a cooling fluid that flows in one direction.

[0013] The utility model is further configured as follows: the coil rises in a spiral along the outer side wall of the deliquidation tank.

[0014] The utility model is further configured as follows: the fluid inlet of the coil is located at the top end of the coil, and the fluid outlet of the coil is located at the bottom end of the coil.

[0015] In summary, compared with the prior art, the utility model has the following beneficial effects: the utility model condenses and filters the process gas in the deliquidation tank through a cooler and a wire mesh demister, removes a large amount of liquid and solid particles in the process gas, so that the process gas output from the deliquidation tank can meet the needs of normal operation of the dry gas seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0017] Figure 2 A schematic diagram showing the wire mesh demister in the deliquescence tank.

[0018] In the figure: 1. deliquidation tank; 11. air inlet; 12. air outlet; 13. drain outlet; 2. wire mesh demister; 3. cooling device; 4. first valve; 5. differential pressure transmitter; 6. liquid level transmitter; 7. second valve; 8. third valve; 9. fourth valve. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] It should be noted that the terms "center", "up", "down", "horizontal", "left", "right", "front", "back", "lateral", "longitudinal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0021] Example

[0022] like Figure 1-2 As shown, it is the basic structure of the preferred embodiment of the utility model. This embodiment provides an ammonia compressor dry gas seal deliquifier device, which includes a deliquating tank 1, a wire mesh defoamer 2, a cooling device 3 and a first valve 4. The cooling device 3 is used to reduce the temperature in the deliquating tank 1. The wire mesh defoamer 2 is a gas-liquid separation device. When the gas passes through the wire mesh defoamer 2, the wire pad in the wire mesh defoamer 2 can remove the liquid and solid particles in the gas. The wire mesh defoamer 2 can be detachably connected to the deliquating tank 1, and the deliquating tank 1 is divided into two upper and lower spaces. The deliquating tank 1 is provided with an air inlet 11, an air outlet 12 and a liquid discharge port 13. The air inlet 11 is connected to the space below the wire mesh defoamer 2, and the air outlet 12 and the liquid discharge port 13 are both connected to the space above the wire mesh defoamer 2. The liquid discharge port 13 is located at the bottom of the deliquating tank 1, and the first valve 4 is installed at the liquid discharge port 13, and the first valve 4 is normally closed.

[0023] After the process gas is sent into the deliquidation tank 1, a large amount of liquid and solid particles in the process gas are quickly removed under the filtering effect of the low temperature and the wire mesh demister 2, so that the process gas output by the deliquidation tank 1 meets the quality requirements of the dry gas seal for the first-level sealing gas. After the device is used for a period of time, the drain port 13 can be opened through the first valve 4, and after the liquid in the deliquidation tank 1 is completely discharged, the first valve 4 can be closed.

[0024] The present embodiment further comprises a differential pressure transmitter 5, which is used to detect the pressure difference between the air inlet 11 and the air outlet 12. When the pressure difference exceeds a certain set value, it means that the wire mesh demister 2 needs to be replaced. In the present embodiment, the wire mesh demister 2 is replaced when the pressure difference exceeds 0.1 Mpa.

[0025] This embodiment further includes a liquid level transmitter 6, which is disposed in the deliquidation tank 1 to detect the liquid level in the deliquidation tank 1. When the liquid level exceeds the set maximum height, it means that the first valve 4 needs to be opened for drainage. The liquid level transmitter 6 in this embodiment is a magnetic flap liquid level transmitter.

[0026] In this embodiment, the first valve 4 is an electric control valve, and the liquid level transmitter 6 is connected to the electric control valve signal; specifically, the signal of the liquid level measured by the liquid level transmitter 6 is input into the control system or logic circuit, and the control system or logic circuit controls the opening and closing of the electric control valve. In this embodiment, the control system or logic circuit controls the opening and closing of the electric control valve according to the rule: when the liquid level transmitter 6 detects that the liquid level in the dehydration tank 1 reaches the set maximum height, the electric control valve opens; when the liquid level transmitter 6 detects that the liquid level in the dehydration tank 1 is lower than the set minimum height, the electric control valve closes.

[0027] Specifically, the measuring range of the liquid level transmitter 6 is entirely located in the space below the wire mesh demister 2, and the maximum height is set to 45% of the measuring range of the liquid level transmitter 6, reserving sufficient time for the operator to open the drain port 13 to prevent excessive liquid in the deliquidation tank 1 from affecting the deliquidation effect; the minimum height is set to 5% of the measuring range of the liquid level transmitter 6, reserving sufficient time for the operator to close the drain port 13 to prevent the gas in the deliquidation tank 1 from leaking from the drain port 13.

[0028] This embodiment further includes a second valve 7 and a third valve 8, both of which are manually controlled valves; the second valve 7 is connected to the liquid discharge port 13, and the second valve 7 is normally closed; the third valve 8 is installed between the electric control valve and the liquid discharge port 13, and the third valve 8 is normally open. When the electric control valve fails, the third valve 8 can be closed, and the liquid discharge of the deliquidation tank 1 can be manually controlled through the second valve 7.

[0029] In this embodiment, a fourth valve 9 is further provided on the output side of the electric control valve, and the fourth valve 9 is normally open.

[0030] This embodiment also includes an alarm device, which is connected to the liquid level transmitter 6 by signal, and is used to send an alarm signal when the liquid level transmitter 6 detects that the liquid level in the dehydration tank 1 reaches a set maximum height, so as to remind the operator that the dehydration tank 1 should immediately perform a liquid discharge operation, and the alarm signal is at least one of a sound signal and a light signal. The alarm device is not shown in the figure.

[0031] In this embodiment, the cooling device 3 is a coil surrounded by the outside of the deliquation tank 1, and the coil contains a cooling fluid flowing in one direction. In this embodiment, the cooling fluid in the coil is liquid ammonia.

[0032] Specifically, the coil rises in a spiral along the outer wall of the deliquescence tank 1 .

[0033] Specifically, the fluid inlet of the coil is located at the top of the coil, and the fluid outlet of the coil is located at the bottom of the coil, so that the flow direction of the cooling fluid in the coil is opposite to the flow direction of the process gas in the deliquidation tank 1 to enhance the condensation effect.

[0034] In summary, this embodiment condenses and filters the process gas in the deliquidation tank 1 through the cooler and the wire mesh demister 2, and removes a large amount of liquid and solid particles in the process gas, so that the process gas output by the deliquidation tank 1 can meet the needs of normal operation of the dry gas seal.

[0035] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An ammonia compressor dry gas seal deliquifier device, characterized in that: The invention comprises a deliquidation tank (1), a wire mesh demister (2), a cooling device (3) and a first valve (4); the cooling device (3) is used to reduce the temperature in the deliquidation tank (1); the wire mesh demister (2) is detachably connected to the deliquidation tank (1) to divide the deliquidation tank (1) into two upper and lower spaces; the deliquidation tank (1) is provided with an air inlet (11), an air outlet (12) and a liquid discharge port (13); the air inlet (11) is communicated with the space below the wire mesh demister (2), and the air outlet (12) and the liquid discharge port (13) are both communicated with the space above the wire mesh demister (2); the liquid discharge port (13) is located at the bottom of the deliquidation tank (1), and the first valve (4) is installed at the liquid discharge port (13).

2. The dry gas seal deliquifier device for an ammonia compressor according to claim 1, characterized in that: It also comprises a differential pressure transmitter (5), wherein the differential pressure transmitter (5) is used to detect the pressure difference between the air inlet (11) and the air outlet (12).

3. An ammonia compressor dry gas seal deliquifier device according to claim 1 or 2, characterized in that: It also comprises a liquid level transmitter (6), which is arranged in the deliquidation tank (1) to detect the height of the liquid level in the deliquidation tank (1).

4. The dry gas seal deliquidator device for an ammonia compressor according to claim 3, characterized in that: The first valve (4) is an electrically controlled valve, and the liquid level transmitter (6) is connected to the electronically controlled valve signal; when the liquid level transmitter (6) detects that the liquid level in the deliquidation tank (1) reaches a set maximum height, the electronically controlled valve opens; when the liquid level transmitter (6) detects that the liquid level in the deliquidation tank (1) is lower than a set minimum height, the electronically controlled valve closes.

5. The dry gas seal deliquifier device for an ammonia compressor according to claim 4, characterized in that: The invention also comprises a second valve (7) and a third valve (8), wherein the second valve (7) and the third valve (8) are both manually controlled valves; the second valve (7) is connected to the liquid discharge port (13), and the second valve (7) is normally closed; the third valve (8) is installed between the electric control valve and the liquid discharge port (13), and the third valve (8) is normally open.

6. The dry gas seal deliquifier device for an ammonia compressor according to claim 3, characterized in that: It also comprises an alarm device, which is used to send out an alarm signal when the liquid level transmitter (6) detects that the liquid level in the deliquidation tank (1) reaches a set maximum height, and the alarm signal is at least one of a sound signal and a light signal.

7. The dry gas seal deliquifier device for an ammonia compressor according to claim 3, characterized in that: The liquid level transmitter (6) is a magnetic flap liquid level transmitter.

8. An ammonia compressor dry gas seal deliquifier device according to claim 1 or 2, characterized in that: The cooling device (3) is a coil surrounding the outside of the deliquidation tank (1), and a cooling fluid flows in one direction in the coil.

9. The dry gas seal deliquifier device for an ammonia compressor according to claim 8, characterized in that: The coil rises in a spiral along the outer wall of the deliquescence tank (1).

10. The dry gas seal deliquifier device for an ammonia compressor according to claim 9, characterized in that: The fluid inlet of the coil is located at the top end of the coil, and the fluid outlet of the coil is located at the bottom end of the coil.

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