Oil return device for chlorine liquefaction system

Abstract

The utility model belongs to the technical field of chlorine liquefaction process, and particularly discloses an oil return device for a chlorine liquefaction system, which comprises a chlorine liquefier, an oil-fluorine separator and a compression cooling unit, and an oil return pipeline I, an oil return pipeline II and an oil return pipeline III with different heights are connected onto the chlorine liquefier. A chlorine liquefier oil return control valve is arranged on the oil return pipeline, the oil return pipeline I, the oil return pipeline II and the oil return pipeline III are gathered and connected to one end of an oil return header pipe, and the other end of the oil return header pipe is connected with an oil fluorine inlet of an oil fluorine separator; the oil-fluorine separator is connected with the oil-fluorine separator oil return pipeline through the oil-fluorine separator high-pressure gas inlet pipeline and the oil-fluorine separator gas-fluorine outlet pipeline, and the device can effectively recover refrigerating machine oil deposited in the chlorine liquefier in time, so that the heat exchange effect of the chlorine liquefier and the operation efficiency of a unit are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chlorine liquefaction process technical field, specifically related to an oil return device for chlorine liquefaction system. BACKGROUND

[0002] In the domestic chlor-alkali industry, liquid chlorine is converted from chlorine gas through the cooling and compression process of the refrigeration system in the ion exchange membrane caustic soda system, and the chlorine liquefying unit is a complete set of equipment specially designed for converting chlorine gas from gaseous state to liquid state, which utilizes freon to circulate between the chlorine liquefier and the condenser, and through heat exchange, the chlorine gas is cooled to below its boiling point to be liquefied.

[0003] However, during the operation of the unit, part of the refrigerant oil will be carried into the chlorine liquefier by the liquid freon, and due to the special structure of the liquefier, the liquid freon is gasified in the chlorine liquefier, and since the density of freon is greater than that of refrigerant oil, the refrigerant oil carried into the liquefier cannot be gasified and returned to the system with the gas freon, and then floats on the surface of the liquid freon, and slowly accumulates over time, and the excessive refrigerant oil in the chlorine liquefier reduces the heat exchange area of the liquefier, resulting in reduced liquefaction efficiency of the chlorine liquefier and poor refrigeration effect.

[0004] At the same time, the suction pressure of the unit is reduced, which can easily cause the compressor to run with liquid, reduce the suction temperature, cause the body and the suction end to partially or extensively frost, cause the compressor to produce abnormal vibration and noise, and further damage the compressor; when the refrigerant oil level is insufficient and needs to be supplemented, the freon in the oil separator needs to be exhausted, which will cause waste of freon.

[0005] Therefore, it is necessary to design an oil return device for chlorine liquefaction system, which can effectively recover and use the refrigerant oil deposited in the chlorine liquefier in time, improve the heat exchange effect of the chlorine liquefier, and improve the operation efficiency of the unit. Utility model content

[0006] In view of the problems of the prior art, the utility model aims to provide an oil return device for chlorine liquefaction system to solve the problems of part of the refrigerant oil being carried into the chlorine liquefier by the liquid freon, causing the chlorine liquefier to have low liquefaction efficiency, poor refrigeration effect, damaged compressor, and waste of freon.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] The application discloses a back oil device for a chlorine liquefaction system, which comprises a chlorine liquefier, an oil-fluorine separator and a compression cooling unit, wherein the chlorine liquefier is connected with a back oil pipeline I, a back oil pipeline II and a back oil pipeline III; the back oil pipeline I is provided with a chlorine liquefier back oil control valve I; the back oil pipeline II is provided with a chlorine liquefier back oil control valve II; the back oil pipeline III is provided with a chlorine liquefier back oil control valve III; the back oil pipeline I, the back oil pipeline II and the back oil pipeline III are connected with one end of a back oil main pipeline; the other end of the back oil main pipeline is connected with an oil-fluorine inlet of the oil-fluorine separator; the oil-fluorine separator is provided with a temperature sensor; the oil-fluorine separator is connected with a freon compressor through a plurality of pipelines; a gaseous freon inlet of the oil-fluorine separator is connected with the freon compressor through an oil-fluorine separator high-pressure gas inlet pipeline; a gaseous freon outlet of the oil-fluorine separator is connected with the freon compressor through an oil-fluorine separator gaseous freon outlet pipeline; an oil outlet of the oil-fluorine separator is connected with the freon compressor through an oil-fluorine separator back oil pipeline; the oil-fluorine separator high-pressure gas inlet pipeline is provided with an ejector high-pressure gas inlet control valve; the oil-fluorine separator gaseous freon outlet pipeline is provided with a gaseous freon outlet control valve; and the oil-fluorine separator back oil pipeline is provided with an oil-fluorine separator back oil valve.

[0009] More preferably, the back oil pipeline I, the back oil pipeline II and the back oil pipeline III are arranged in sequence from left to right on the chlorine liquefier 1 in ascending order of height.

[0010] More preferably, the back oil pipeline I is provided with a temperature sensor I, the back oil pipeline II is provided with a temperature sensor II, and the back oil pipeline III is provided with a temperature sensor III.

[0011] More preferably, the chlorine inlet on the upper right side of the chlorine liquefier is connected with an ion-exchange membrane caustic soda chlorine treatment system, and the liquid chlorine outlet on the lower right side of the chlorine liquefier is connected with an ion-exchange membrane caustic soda liquid chlorine storage system.

[0012] More preferably, the back oil main pipeline is provided with a chlorine liquefier back oil control valve.

[0013] More preferably, the compression cooling unit comprises a freon compressor, the freon compressor outlet is connected with an oil-gas separator through a compressor outlet pipeline, one outlet of the oil-gas separator is connected with an oil cooler, the other outlet of the oil-gas separator is connected with a condenser, the oil cooler outlet is connected with a freon compressor refrigerator oil inlet, the oil-gas separator is provided with a radar liquid level meter, and the condenser outlet is connected with a liquid storage device.

[0014] More preferably, the freon compressor is connected with the gaseous freon outlet of the chlorine liquefier through a gaseous freon pipeline.

[0015] More preferably, the liquid storage device is connected with the liquid freon inlet of the chlorine liquefier through a liquid freon pipeline.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides an oil return device for chlorine liquefaction system, when part refrigerating machine oil enters chlorine liquefier, high temperature high pressure gaseous freon is introduced in oil fluorine separator, oil fluorine separator forms negative pressure area under the injection of high temperature high pressure gas, injects refrigerating machine oil and freon mixture in chlorine liquefier to oil fluorine separator, and utilizes the characteristics that liquid fluorine gasifies under high temperature high pressure, separates oil fluorine mixture, and refrigerating machine oil is inhaled, compressed and discharged to oil gas separator, and the oil-rich area of chlorine liquefier disappears, reaches the purpose of returning oil, makes chlorine liquefier ensure maximum efficiency operation, avoids the waste of refrigerating machine oil and freon, makes chlorine liquefying unit can stably and efficiently operate, has very strong practicality. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is process flow diagram of the utility model;

[0019] The meaning of the reference signs is as follows: 1, chlorine liquefier;2, temperature sensor I;3, chlorine liquefier oil return control valve I;4, temperature sensor II;5, chlorine liquefier oil return control valve II;6, temperature sensor III;7, chlorine liquefier oil return control valve III;8, ion exchange membrane caustic soda chlorine treatment system;9, ion exchange membrane caustic soda liquid chlorine storage system;10, gas fluorine pipeline;11, gas fluorine outlet control valve;12, ejector high pressure gas control valve;13, chlorine liquefier oil return control valve;14, oil fluorine separator;15, temperature sensor;16, oil return main pipe;17, oil fluorine separator gas fluorine outlet pipeline;18, oil fluorine separator oil return valve;19, oil fluorine separator oil return pipeline;20, oil fluorine separator high pressure gas pipeline;21, liquid fluorine pipeline;22, freon compressor;23, oil cooler;24, oil gas separator;25, condenser;26, liquid accumulator;27, radar liquid level meter;28, compressor outlet pipeline;29, oil return pipeline I;30, oil return pipeline II;31, oil return pipeline III. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following is in combination with the drawings and examples, and the utility model is further detailed.The specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0021] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, in the description of the utility model, the meaning of "several" is two or more than two, unless otherwise specifically limited.

[0022] As Figure 1 The utility model provides a kind of oil return device for chlorine liquefaction system, including chlorine liquefier 1, oil fluorine separator 14 and compression cooling unit, chlorine liquefier 1 is sequentially connected from left to right with increasing height oil return pipeline I 29, oil return pipeline II 30 and oil return pipeline III 31, to meet the oil fluorine mixture of different liquid level discharge, oil return pipeline I 29 is equipped with chlorine liquefier oil return control valve I 3, oil return pipeline II 30 is equipped with chlorine liquefier oil return control valve II 5, oil return pipeline III 31 is equipped with chlorine liquefier oil return control valve III 7, temperature sensor I 2 is equipped on oil return pipeline I 29, temperature sensor II 4 is equipped on oil return pipeline II 30, temperature sensor III 6 is equipped on oil return pipeline III 31, temperature sensor and oil return control valve form interlock, when temperature reaches certain value, open corresponding oil return control valve;Oil return pipeline I 29, oil return pipeline II 30 and oil return pipeline III 31 are connected in oil return main pipe 16 one end in general, oil return main pipe 16 is equipped with chlorine liquefier oil return control valve 13, oil return main pipe 16 other end is connected with oil fluorine inlet of oil fluorine separator 14, temperature sensor 15 is equipped on oil fluorine separator 14, and the temperature of oil fluorine separator 14 is detected, oil fluorine separator 14 gaseous freon inlet is connected with freon compressor 22 by oil fluorine separator high-pressure inlet pipeline 20, oil fluorine separator 14 gaseous freon outlet is connected with freon compressor 22 by oil fluorine separator gas fluorine outlet pipeline 17, oil fluorine separator 14 oil outlet is connected with freon compressor 22 by oil fluorine separator oil return pipeline 19, oil fluorine separator high-pressure inlet pipeline 20 is equipped with injector high-pressure inlet control valve 12, oil fluorine separator gas fluorine outlet pipeline 17 is equipped with gas fluorine outlet control valve 11, oil fluorine separator oil return pipeline 19 is equipped with oil fluorine separator oil return valve 18.

[0023] Chlorine inlet of chlorine liquefier 1 right side upper portion is connected with ion exchange membrane caustic soda chlorine treatment system 8, liquid chlorine outlet of chlorine liquefier 1 right side lower portion is connected with ion exchange membrane caustic soda liquid chlorine storage system 9.

[0024] The compressed cooling unit comprises a freon compressor 22, an oil-gas separator 24 connected with the outlet of the freon compressor 22 through a compressor outlet pipeline 28, an oil cooler 23 connected with one outlet of the oil-gas separator 24, a condenser 25 connected with another outlet of the oil-gas separator 24, and an oil level gauge 27 arranged on the oil-gas separator 24.

[0025] In use, the chloro liquefier 1 exchanges heat between the chlorine from the ion membrane caustic soda chlorine treatment system 8 and the liquid freon from the liquid storage 26, the gaseous freon after heat exchange is compressed by the freon compressor 22 through the gas freon pipeline 10, the high-temperature and high-pressure gaseous freon enters the oil-gas separator 24 with the refrigerant oil through the compressor outlet pipeline 28, the refrigerant oil is separated from the freon, the separated high-temperature refrigerant oil enters the oil cooler 23 for cooling and then returns to the freon compressor 22 for recycling, the high-temperature and high-pressure freon steam separated by the oil-gas separator 24 enters the condenser 25 for further cooling to form liquid freon stored in the liquid storage 26, and the liquid freon stored in the liquid storage 26 enters the chloro liquefier 1 again through the liquid freon pipeline 21 to exchange heat with the chlorine, the chlorine after heat exchange with the liquid freon becomes liquid chlorine and is stored in the ion membrane caustic soda liquid chlorine storage system 9, so that the heat exchange process between the freon and the chlorine forms a closed loop.

[0026] During the operation of the chloro liquefier, part of the refrigerant oil not separated by the oil-gas separator 24 enters the chloro liquefier 1 with the high-temperature and high-pressure gaseous freon, and the refrigerant oil in the chloro liquefier 1 gradually increases after long-time operation, affecting the chloro liquefaction efficiency, the oil return device is added, the radar liquid level gauge 27 on the upper part of the oil-gas separator 24 is used for real-time detection, when the oil level is lower than 2 / 3 of the liquid level gauge, an electric signal is transmitted to the PLC control system, the temperature sensor I 2, the temperature sensor II 4 and the temperature sensor III 6 in the chloro liquefier 1 are powered on to work, the temperature value of the chloro liquefier 1 is collected and transmitted to the DCS control system in the central control room, the DCS system judges according to the temperature value of the temperature sensor, when the temperature is less than the set value, the corresponding chloro liquefier oil return control valve I 3 or chloro liquefier oil return control valve II 5 or chloro liquefier oil return control valve III 7 is interlocked and opened, and enters the oil return main pipe 16 through the oil return pipeline I 29 or the oil return pipeline II 30 or the oil return pipeline III 31.

[0027] Further, the chlorine liquefier oil return control valve 13 is opened, and then the ejector high pressure inlet control valve 12 is slowly opened, the high temperature and high pressure freon gas at the exhaust end of the freon compressor 22 is injected into the oil-freon separator 14 through the oil-freon separator gas-freon outlet pipeline 20, the oil-freon mixture in the chlorine liquefier 1 is introduced and recovered, when the temperature in the oil-freon separator 14 reaches the set value detected by the temperature sensor 15, the ejector high pressure inlet control valve 12 is closed, the oil-freon separator oil return valve 18 and the gas-freon outlet control valve 11 are automatically opened, the oil-freon mixture is separated in the oil-freon separator 14 by using the characteristic that the liquid freon gasifies under high temperature and high pressure, the gas-freon enters the freon compressor 22 through the gas-freon outlet pipeline 17 under the action of the pressure difference, the refrigerant oil returns to the compressor refrigerant oil inlet pipeline through the oil return pipeline 19 under the action of gravity and pressure difference, and the temperature in the oil-freon separator 14 is monitored in real time by the temperature sensor 15, and the opening degrees of the ejector high pressure inlet control valve 12 and the chlorine liquefier oil return control valve 13 are controlled by the DCS system interlocking, and thus the oil-freon mixture in the chlorine liquefier 1 is gradually separated and recovered.

[0028] Further, when the radar liquid level meter 27 at the upper part of the oil separator 24 detects that the liquid level reaches the normal liquid level range, the corresponding chlorine liquefier oil return control valve I 3 or chlorine liquefier oil return control valve II 5 or chlorine liquefier oil return control valve III 7 is interlocked and closed, the chlorine liquefier oil return control valve 13, the ejector high pressure inlet control valve 12, the gas-freon outlet control valve 11, the oil-freon separator 14 and the oil-freon separator oil return valve 18 are closed, and an automatic oil return cycle process is completed.

[0029] The utility model provides a kind of oil return device for chlorine liquefaction system, when part refrigerant oil enters chlorine liquefier 1, high temperature and high pressure gaseous freon is introduced in oil-freon separator 14, oil-freon separator 14 forms negative pressure zone under the injection of high temperature and high pressure gas, refrigerant oil and freon mixture in chlorine liquefier 1 are injected to oil-freon separator 14, and oil-freon mixture is separated by using the characteristic that liquid freon gasifies under high temperature and high pressure, refrigerant oil is inhaled, compressed and discharged to oil-gas separator 24, chlorine liquefier oil-rich area disappears, to achieve the purpose of oil return, so that chlorine liquefier 1 ensures maximum efficiency operation, avoid refrigerant oil and freon waste, so that chlorine liquefier unit can stably and efficiently operate, with very strong practicality.

[0030] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An oil return device for a chlorine liquefaction system, comprising a chlorine liquefier, an oil fluorine separator, and a compression cooling unit, characterized in that: The chlorine liquefier (1) is connected with an oil return pipeline I (29), an oil return pipeline II (30) and an oil return pipeline III (31), the oil return pipeline I (29) is provided with a chlorine liquefier oil return control valve I (3), the oil return pipeline II (30) is provided with a chlorine liquefier oil return control valve II (5), the oil return pipeline III (31) is provided with a chlorine liquefier oil return control valve III (7), the oil return pipeline I (29), the oil return pipeline II (30) and the oil return pipeline III (31) are connected with an oil return main pipe (16) at one end, the other end of the oil return main pipe (16) is connected with an oil fluorine separator (14) oil fluorine inlet, the oil fluorine separator (14) is provided with a temperature sensor (15), the oil fluorine separator (14) is connected with a freon compressor (22) through a plurality of pipelines, the gaseous freon inlet of the oil fluorine separator (14) is connected with the freon compressor (22) through an oil fluorine separator high-pressure gas inlet pipeline (20), the gaseous freon outlet of the oil fluorine separator (14) is connected with the freon compressor (22) through an oil fluorine separator gaseous fluorine outlet pipeline (17), the oil outlet of the oil fluorine separator (14) is connected with the freon compressor (22) through an oil fluorine separator oil return pipeline (19), the oil fluorine separator high-pressure gas inlet pipeline (20) is provided with an ejector high-pressure gas inlet control valve (12), the oil fluorine separator gaseous fluorine outlet pipeline (17) is provided with a gaseous fluorine outlet control valve (11), and the oil fluorine separator oil return pipeline (19) is provided with an oil fluorine separator oil return valve (18).

2. The oil return device for a chlorine liquefaction system according to claim 1, characterized by: The height of the oil return pipeline I (29), the oil return pipeline II (30) and the oil return pipeline III (31) increases from left to right on the chlorine liquefier (1).

3. The oil return device for a chlorine liquefaction system according to claim 1, characterized by: The oil return pipeline I (29) is provided with a temperature sensor I (2), the oil return pipeline II (30) is provided with a temperature sensor II (4), and the oil return pipeline III (31) is provided with a temperature sensor III (6).

4. The oil return device for a chlorine liquefaction system according to claim 1, characterized by: The chlorine gas inlet on the right upper part of the chlorine liquefier (1) is connected with an ion membrane caustic soda chlorine gas treatment system (8), and the liquid chlorine outlet on the right lower part of the chlorine liquefier (1) is connected with an ion membrane caustic soda liquid chlorine storage system (9).

5. The oil return device for a chlorine liquefaction system according to claim 1, characterized by: The oil return main pipe (16) is provided with a chlorine liquefier oil return control valve (13).

6. The oil return device for a chlorine liquefaction system according to claim 1, characterized by: The compression cooling unit comprises a freon compressor (22), the outlet of the freon compressor (22) is connected with an oil-gas separator (24) through a compressor outlet pipeline (28), one outlet of the oil-gas separator (24) is connected with an oil cooler (23), the other outlet of the oil-gas separator (24) is connected with a condenser (25), the outlet of the oil cooler (23) is connected with the refrigerating machine oil inlet of the freon compressor (22), the oil-gas separator (24) is provided with a radar liquid level meter (27), and the outlet of the condenser (25) is connected with a liquid storage device (26).

7. The oil return device for a chlorine liquefaction system according to claim 1, characterized by: The freon compressor (22) is connected with the gaseous fluorine outlet of the chlorine liquefier (1) through a gaseous fluorine pipeline (10).

8. The oil return device for a chlorine liquefaction system according to claim 6, characterized by: The liquid fluorine pipeline (21) is connected with the liquid fluorine inlet of the chlorine liquefier (1).

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