CN212339284U - Purge gas discharge system of methyl ethyl ketone device - Google Patents
Purge gas discharge system of methyl ethyl ketone device Download PDFInfo
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- CN212339284U CN212339284U CN202020673288.XU CN202020673288U CN212339284U CN 212339284 U CN212339284 U CN 212339284U CN 202020673288 U CN202020673288 U CN 202020673288U CN 212339284 U CN212339284 U CN 212339284U
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Abstract
The utility model relates to a methyl ethyl ketone device relaxs gassing discharge system, including the blow-down jar, including the first region and the second region of mutual isolation in the blow-down jar, the first region of blow-down jar is used for receiving the atmospheric tower's of methyl ethyl ketone device the gassing of relaxing, be equipped with high point atmospheric line and first safety valve group on the first region of blow-down jar, first safety valve group is through first pipe connection to the second of blow-down jar is regional, through torch pipe connection to outside the country gas cabinet or outside the country torch house steward on the second region of blow-down jar, be equipped with pressure-controlled valve on the high point atmospheric line, this high point atmospheric line is in the low reaches position of pressure-controlled valve passes through second pipe connection to on the first pipeline, be equipped with first hand valve on the second pipeline. The pressure control valve on the high-point purge gas pipeline is used for stabilizing the pressure in the first area in the purge tank, so that the influence of the pressure fluctuation of the flare header on the operation of the atmospheric tower can be effectively reduced.
Description
Technical Field
The utility model relates to a methyl ethyl ketone device technical field especially relates to a methyl ethyl ketone device relaxs gassing discharge system.
Background
The blow tank of the methyl ethyl ketone production device generally has two independent areas, wherein one area is used for receiving purge gas of all atmospheric towers of the device, and the other area is used for receiving relief gas of safety valves of the device. Specifically, purge gas of each atmospheric tower of the methyl ethyl ketone device is uniformly discharged into a first area of a blow-down tank after being subjected to deep cooling by frozen saline water, and is discharged into a purge gas header pipe after being subjected to water washing in the blow-down tank; another way is to vent the exhaust from a high point vent on site directly through the regulating valve and flame arrestor.
However, in the actual production process, the discharge mode of the purge gas of the methyl ethyl ketone production device has certain defects, firstly, when the purge gas of the blow-down tank is discharged to a gas holder or a torch system, the pressure of each atmospheric tower is easily fluctuated frequently due to the pressure fluctuation of a main pipe of a downstream system, and the operation difficulty is high; secondly, the purge gas of the atmospheric tower and the purge gas of the product tower of the methyl ethyl ketone device are uniformly discharged into one area of the blow-down tank, so that the influence on the product tower is large, the stable operation of the product tower is influenced, and the product quality is also influenced; in addition, because the purge gas contains flammable and explosive media, and is discharged from a high point on the spot through the regulating valve and the flame arrester, the environment is polluted, certain safety risk exists, and particularly, the safety risk is higher in the case of thunderstorm weather.
Therefore, the existing purge gas discharge system of the methyl ethyl ketone device needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to prior art's current situation, provide a can effectively avoid low reaches torch system house steward to cause undulant methyl ethyl ketone device of influence to atmospheric tower pressure to blow off gas discharge system.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a methyl ethyl ketone device relaxs gassing discharge system, includes the blow-down jar, it is regional including the first region and the second of mutual isolation in the blow-down jar, the first region of blow-down jar is used for receiving the speed of the atmospheric tower of methyl ethyl ketone device and deflates, be equipped with high point blow-down pipeline and first safety valve group on the first region of blow-down jar, first safety valve group is through first pipe connection to the second of blow-down jar is regional, through torch pipe connection to the outer gas cabinet or outer torch house steward in a boundary on the second region of blow-down jar, be equipped with pressure-controlled valve on the high point blow-down pipeline, this high point blow-down pipeline is in the low reaches position of pressure-controlled valve passes through second pipe connection to on the first pipeline, be equipped with first hand valve on the second pipeline.
As a modification, the first relief valve group comprises two first relief valves arranged in parallel, the upstream and downstream sides of the two first relief valves are respectively provided with a first upstream hand valve and a first downstream hand valve, and the second pipeline is connected between one of the first relief valves and the corresponding first downstream hand valve. The first downstream hand valve and the first hand valve on the second pipeline are arranged to isolate the newly added second pipeline from other pipelines.
In order to conveniently cut out and overhaul the corresponding first safety valve group, the first safety valve group is also connected with a first bypass in parallel, and the first bypass is provided with a first bypass valve.
As an improvement, the blowdown tank further comprises a third area isolated from the first area and the second area, the third area is used for receiving purge gas of a product tower of the methyl ethyl ketone device, the third area of the blowdown tank is connected to the high-point blowdown pipeline through a third pipeline, and a second safety valve bank is further arranged at the top of the third area of the blowdown tank and communicated with the first pipeline. The structure is arranged, so that the first area of the emptying tank receives the purge gas of all the atmospheric towers except the product tower, the second area of the emptying tank receives the purge gas of each safety valve, and the third area of the emptying tank only receives the purge gas from the product tower, thereby reducing the influence on the product tower and stabilizing the product quality.
In order to conveniently cut out and overhaul the corresponding second safety valves, the second safety valve group comprises two second safety valves which are arranged in parallel, and the upstream side and the downstream side of each of the two second safety valves are provided with a second upstream hand valve and a second downstream hand valve.
In order to conveniently cut out and overhaul the corresponding first safety valve group, the second safety valve group is also connected with a second bypass in parallel, and a second bypass valve is arranged in the second bypass.
Compared with the prior art, the utility model has the advantages that: the utility model discloses a on the downstream side piping (second pipeline) of the pressure-controlled valve on original high point blow-down pipeline to the first pipeline behind the first safety valve group, then will relax and bleed and collect to the second region of blow-down jar in, send to in the outer gas cabinet of boundary or the outer torch house steward in the end, can utilize the pressure-controlled valve on the blow-down high point blow-down pipeline to stabilize the first area pressure in the blow-down jar like this, and then reduce the influence of torch house steward pressure fluctuation to the operation of atmospheric tower. In addition, the post-routing on-site high-point venting of the purge gas of the blow-down tank is changed into the flare header pipe venting, and the safety risk existing during the high-point venting is also eliminated.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Referring to fig. 1, a methyl ethyl ketone device purge gas discharge system includes a blow tank 10, a first zone 11, a second zone 12, and a third zone 13 isolated from each other. Wherein the first region 11 of the blow down tank 10 is for receiving the purge gas of the atmospheric column of the methyl ethyl ketone unit and the first region 11 of the blow down tank 10 is for receiving the purge gas of the product column of the methyl ethyl ketone unit. A first set of safety valves 30 is connected to the top of the first zone 11 of the flare tank 10. the first set of safety valves 30 is connected to the second zone 12 of the flare tank 10 by a first line 41. the second zone 12 of the flare tank 10 is connected to an extra-ambient gas cabinet or extra-ambient flare header by a flare line 21. A second set of safety valves 60 is connected to the top of the third zone 13 of the flare tank 10. this second set of safety valves 60 is also connected to the second zone 12 of the flare tank 10 by a first line 41.
The first relief valve group 30 includes two first relief valves 300 arranged in parallel, and a first upstream hand valve 31 and a first downstream hand valve 32 are provided on both upstream and downstream sides of the two first relief valves 300. In order to facilitate the cutting-out of the respective first relief valves for servicing, the first relief valve block 30 is also connected in parallel with a first bypass 70, which is provided with a first bypass valve 71 on the first bypass 70.
The second relief valve group 60 includes two second relief valves 600 arranged in parallel, and a second upstream hand valve 61 and a second downstream hand valve 62 are arranged on the upstream and downstream sides of the two second relief valves 600. In order to facilitate the cutting-out of the respective second relief valve for servicing, the second valve block 60 is also connected in parallel with a second bypass 80, in which a second bypass valve 81 is provided.
The top of the first area 11 of the prior methyl ethyl ketone device blow tank 10 is connected with a high point blow line 20, and the high point blow line 20 is provided with a pressure control valve 50. In this embodiment, the high-point vent line 20 is connected to the first line 41 at a position downstream of the pressure-controlled valve 50 by adding a second line on which a first hand valve is provided. Specifically, the outlet of the second pipeline is connected between one of the first relief valves and the corresponding first downstream hand valve 32, wherein the first hand valve on the second pipeline and the first downstream hand valve 32 are arranged to isolate the newly added second pipeline from other pipelines.
The third zone 13 of the blow-down tank 10 in this embodiment is connected by a third line to the high point blow-down line 20 described above. That is, the purge gas of the product column is introduced into the third zone 13 of the blow tank 10, passed through the high point blow-off line 20 and the second line in this order, and also introduced into the second zone 12 of the blow tank 10, and is pressure-controlled by the pressure control valve 50 on the high point blow-off line 20. The arrangement is such that the first region 11 of the blow tank 10 receives purge gas from all atmospheric towers except the product tower, the second region 12 of the blow tank 10 receives purge gas from the safety valves, and the third region 13 of the blow tank 10 receives purge gas from the product tower only, which reduces the effect on the product tower and stabilizes product quality.
The advantages of this embodiment: first, the downstream side of the pressure control valve 50 on the original high point vent pipeline 20 is arranged on the first pipeline 41 behind the first safety valve group 30, then the purge gas is collected in the second area 12 of the vent tank 10, and finally the purge gas is sent to an outside gas cabinet or an outside flare header, so that the pressure control valve 50 on the purge gas high point vent pipeline 20 can be used for stabilizing the pressure of the first area 11 and the pressure of the third area 13 in the vent tank 10, and further the influence of flare header pressure fluctuation on the operation of a product tower and other normal pressure towers is reduced. Secondly, the blow-down tank 10 is divided into three areas which are isolated from each other, namely, the first area 11 of the blow-down tank 10 receives purge gas of all the atmospheric towers except the product tower, the third area 13 of the blow-down tank 10 only receives purge gas from the product tower, and the second area 12 of the blow-down tank 10 receives release gas of each safety valve, compared with the prior art that purge gas of the atmospheric tower and purge gas of the product tower are uniformly discharged into one area of the blow-down tank 10, the influence on the product tower is effectively reduced, and the product quality is stabilized. Finally, the post-routing on-site high-point venting of the purge gas of the blow-down tank 10 is changed to flare header discharge, and the safety risk existing during high-point venting is also eliminated.
Claims (6)
1. A purge gas discharge system of a methyl ethyl ketone device comprises a blow-down tank (10), wherein the blow-down tank (10) comprises a first area (11) and a second area (12) which are isolated from each other, the first area (11) of the blow-down tank (10) is used for receiving purge gas of an atmospheric tower of the methyl ethyl ketone device, a high-point blow-down pipeline (20) and a first safety valve group (30) are arranged on the first area (11) of the blow-down tank (10), the first safety valve group (30) is connected to the second area (12) of the blow-down tank (10) through a first pipeline (41), the second area (12) of the blow-down tank (10) is connected to an outside air cabinet or a torch outer header pipe through a torch pipeline (21), and the purge gas discharge system is characterized in that: the high-point emptying pipeline (20) is provided with a pressure control valve (50), the high-point emptying pipeline (20) is connected to the first pipeline (41) through a second pipeline (42) at the downstream position of the pressure control valve (50), and the second pipeline (42) is provided with a first hand valve (420).
2. The methyl ethyl ketone device purge gas discharge system according to claim 1, characterized in that: the first safety valve group (30) comprises two first safety valves (300) which are arranged in parallel, a first upstream hand valve (31) and a first downstream hand valve (32) are arranged on the upstream and downstream sides of the two first safety valves (300), and the second pipeline (42) is connected between one first safety valve (300) and the corresponding first downstream hand valve (32).
3. The methyl ethyl ketone device purge gas discharge system according to claim 2, characterized in that: the first safety valve group (30) is also connected with a first bypass (70) in parallel, and a first bypass valve (71) is arranged on the first bypass (70).
4. A methyl ethyl ketone apparatus purge gas discharge system according to any one of claims 1 to 3, characterized in that: the interior of the blow-down tank (10) further comprises a third area (13) which is isolated from the first area (11) and the second area (12), the third area (13) is used for receiving purge gas of a product tower of the methyl ethyl ketone device, the third area (13) of the blow-down tank (10) is connected to the high-point blow-down pipeline (20) through a third pipeline (43), a second safety valve group (60) is further arranged at the top of the third area (13) of the blow-down tank (10), and the second safety valve group (60) is communicated with the first pipeline (41).
5. The purge gas discharge system of a methyl ethyl ketone apparatus according to claim 4, wherein: the second safety valve group (60) comprises two second safety valves (600) which are arranged in parallel, and a second upstream hand valve (61) and a second downstream hand valve (62) are arranged on the upstream and downstream sides of the two second safety valves (600).
6. A methyl ethyl ketone device purge gas discharge system according to claim 5, characterized in that: the second safety valve group (60) is also connected with a second bypass (80) in parallel, and a second bypass valve (81) is arranged in the second bypass (80).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020673288.XU CN212339284U (en) | 2020-04-28 | 2020-04-28 | Purge gas discharge system of methyl ethyl ketone device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020673288.XU CN212339284U (en) | 2020-04-28 | 2020-04-28 | Purge gas discharge system of methyl ethyl ketone device |
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| Publication Number | Publication Date |
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| CN212339284U true CN212339284U (en) | 2021-01-12 |
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| CN202020673288.XU Active CN212339284U (en) | 2020-04-28 | 2020-04-28 | Purge gas discharge system of methyl ethyl ketone device |
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