CN215924380U

CN215924380U - Device for recovering flash evaporation gas by filling methanol

Info

Publication number: CN215924380U
Application number: CN202122554008.0U
Authority: CN
Inventors: 石国弘; 董华林; 梁明云; 杨占龙; 卢旭海; 张春练
Original assignee: Guizhou Chitianhua Tongzi Chemical Co ltd
Current assignee: Guizhou Chitianhua Tongzi Chemical Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-03-01
Anticipated expiration: 2031-10-22

Abstract

The utility model discloses a device for filling methanol and recovering flash evaporation gas, wherein a filling crane pipe is fixed on a cover plate, a methanol flash evaporation gas storage pipe is arranged on a filling crane pipe fixing head at the outer side of the filling crane pipe, the filling crane pipe and the methanol flash evaporation gas storage pipe are coaxial, the methanol flash evaporation gas storage pipe is connected with the lower end of the side wall of the fixing head, a low-pressure nitrogen filling space is formed among the methanol flash evaporation gas storage pipe, the side wall of the fixing head, the cover plate and the inner wall of a mounting hole, a methanol flash evaporation gas exhaust pipe communicated with the methanol flash evaporation gas storage pipe is arranged on the cover plate, the methanol flash evaporation gas exhaust pipe is connected with a heat exchanger, a nitrogen channel for heat exchange is arranged on the heat exchanger, the inlet end and the outlet end of the nitrogen channel are respectively connected with a nitrogen tap pipe network and a low-pressure nitrogen conveying pipe, and the low-pressure nitrogen filling space are communicated; the utility model can recover the methanol flash evaporation gas, prevent the environmental pollution and avoid the explosion in the recovery process.

Description

Device for recovering flash evaporation gas by filling methanol

Technical Field

The utility model relates to a device for recovering flash steam by filling methanol, belonging to the field of flash steam recovery tools.

Background

When methanol is filled in a filling mode, flash steam can be generated, potential safety hazards and environmental pollution can be caused if the flash steam is directly discharged, and meanwhile, methanol in the components can be wasted if the flash steam is directly discharged; further, air is easily mixed in the process of extracting the methanol flash gas, and if too much air is mixed, more air is mixed with the flash gas, which may cause explosion.

That is, there is a need for a device for recovering flash vapor by filling methanol, which can recover methanol flash vapor and prevent environmental pollution, and at the same time, can avoid explosion during the recovery process.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a device for recovering flash steam by filling methanol, which can recover the methanol flash steam, prevent environmental pollution and avoid explosion in the recovery process; the defects of the prior art can be overcome.

The technical scheme of the utility model is as follows: the utility model provides a device of flash distillation gas is retrieved to filling methyl alcohol, it includes the methyl alcohol tank car, is equipped with the mounting hole of mutually supporting and fills the oil filling riser fixed head on the methyl alcohol tank car, fill the oil filling riser fixed head include with mounting hole mutually supporting fixed head lateral wall and apron, be fixed with on the apron and fill the oil filling riser, be equipped with methyl alcohol flash distillation gas storage tube on filling the oil filling riser fixed head that fills the oil filling riser outside, it is coaxial with methyl alcohol flash distillation gas storage tube to fill oil filling riser, methyl alcohol flash distillation gas storage tube is connected with fixed head lateral wall lower extreme, constitute low pressure nitrogen gas filling space between methyl alcohol flash distillation gas storage tube, fixed head lateral wall, apron and the mounting hole inner wall, be equipped with the methyl alcohol flash distillation gas calandria that communicates with methyl alcohol flash distillation gas storage tube on the apron, methyl alcohol flash distillation gas calandria links to each other with the heat exchanger, is equipped with the nitrogen gas passageway of heat exchange usefulness on the heat exchanger, respectively with nitrogen gas pipe network and low pressure nitrogen gas duct connections, and the low-pressure nitrogen conveying pipe is communicated with the low-pressure nitrogen filling space.

And a sealing adhesive layer is arranged between the outer side of the side wall of the fixing head and the inner wall of the mounting hole.

And a liquid level meter is arranged on the heat exchanger.

The heat exchanger is provided with a tail gas pipeline and a methanol exhaust pipe, and the methanol exhaust pipe is connected to the methanol recovery tank through a methanol pump.

The filling oil filling riser is connected with a methanol product pipeline.

The methanol flash evaporation exhaust pipe is provided with an exhaust fan.

And a pressure reducing valve is arranged on the pipeline between the nitrogen tap water pipe network and the heat exchanger.

Compared with the prior art, the device for recovering flash evaporation gas by filling methanol has the beneficial effects that:

(1) can recover methanol flash evaporation gas and prevent environmental pollution.

(2) The low-pressure nitrogen is filled in the low-pressure nitrogen filling space to prevent the explosion risk caused by the fact that more air is sucked and mixed with flash evaporation gas during suction.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of the connection structure of the present invention.

FIG. 2 is a schematic view of the connection structure of the methanol tanker of the present invention.

Fig. 3 is a schematic illustration of the split structure of fig. 2.

Fig. 4 is a half sectional view of the filling riser fixing head of the present invention.

Wherein, the methanol tank truck 1; a mounting hole 2; filling a loading arm fixing head 3; a fixed head side wall 3-1; a cover plate 3-2; filling a filling riser 3-3; 3-4 parts of a methanol flash evaporation gas storage pipe; filling the space 3-5 with low-pressure nitrogen; a methanol flash evaporation gas discharge pipe 4; a heat exchanger 5; a nitrogen tap pipe network 6; a low-pressure nitrogen delivery pipe 7; a liquid level meter 8; an exhaust fan 9; a pressure relief valve 10.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the utility model only and are not limiting upon the scope of the utility model.

Embodiment 1. as shown in fig. 1, a methanol-filled flash vapor recovery device comprises a methanol tank truck 1, wherein a mounting hole 2 and a filling crane pipe fixing head 3 which are matched with each other are arranged on the methanol tank truck 1, the filling crane pipe fixing head 3 comprises a fixing head side wall 3-1 and a cover plate 3-2 which are matched with the mounting hole 2, and a sealant layer is arranged between the outer side of the fixing head side wall 3-1 and the inner wall of the mounting hole 2; a filling oil filling riser 3-3 is fixed on the cover plate 3-2, and the filling oil filling riser 3-3 is connected with a methanol product pipeline; a methanol flash evaporation gas storage pipe 3-4 is arranged on a filling crane pipe fixing head 3 on the outer side of a filling crane pipe 3-3, the filling crane pipe 3-3 and the methanol flash evaporation gas storage pipe 3-4 are coaxial, the methanol flash evaporation gas storage pipe 3-4 is connected with the lower end of a fixing head side wall 3-1, a low-pressure nitrogen filling space 3-5 is formed among the methanol flash evaporation gas storage pipe 3-4, the fixing head side wall 3-1, a cover plate 3-2 and the inner wall of a mounting hole 2, a methanol flash evaporation gas exhaust pipe 4 communicated with the methanol flash evaporation gas storage pipe 3-4 is arranged on the cover plate 3-2, and an exhaust fan 9 is arranged on the methanol flash evaporation gas exhaust pipe 4; the methanol flash evaporation gas exhaust pipe 4 is connected with a heat exchanger 5, a nitrogen channel for heat exchange is arranged on the heat exchanger 5, the inlet end and the outlet end of the nitrogen channel are respectively connected with a nitrogen tap pipe network 6 and a low-pressure nitrogen conveying pipe 7, and the low-pressure nitrogen conveying pipe 7 is communicated with a low-pressure nitrogen filling space 3-5; a pressure reducing valve 10 is arranged on a pipeline between the nitrogen tap-water pipe network 6 and the heat exchanger 5.

A liquid level meter 8 is arranged on the heat exchanger 5; and a tail gas pipeline and a methanol exhaust pipe are arranged on the heat exchanger 5, and the methanol exhaust pipe is connected to a methanol recovery tank through a methanol pump.

When the device is used, methanol flash gas in a methanol flash gas storage pipe 3-4 is extracted through a methanol flash gas exhaust pipe 4, low-pressure nitrogen is filled in a space 3-5 between low-pressure nitrogen filling spaces to prevent explosion risk caused by more air during suction, the flash gas is connected to an exhaust fan 9 through the methanol flash gas exhaust pipe 4 to be sucked and sent to a shell side of a heat exchanger 5 to exchange heat with the low-pressure nitrogen after throttling and cooling through a pressure reducing valve 10, the low-pressure nitrogen after heat exchange is connected to the low-pressure nitrogen filling spaces 3-5 on a filling crane pipe fixing head 3 through a low-pressure nitrogen conveying pipe 7, high-boiling-point substances (such as methanol and the like) are condensed and accumulated at the bottom of the shell side of the heat exchanger 5 after heat exchange and cooling, the condensed methanol accumulated at the bottom of the heat exchanger is conveyed to a decontamination methanol tank through a methanol pump according to the liquid level displayed by a liquid level gauge 8, and the non-condensable gas at the top of the heat exchanger 5 reaches the national emission standard and is discharged to a carbon dioxide tail gas discharge pipe network of an inspection device; the discharge temperature of the non-condensable gas is controlled to be lower than 10 ℃ by controlling the pressure reduction and the temperature reduction of the low-pressure nitrogen quantity, so that the methanol loss, the potential safety hazard and the environmental pollution caused by the methanol and other substances are avoided; through tests, during methanol filling type filling, the requirements of China on flash evaporation gas emission can be met, and simultaneously methanol can be recycled to reduce enterprise loss.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims

1. The utility model provides a device of flash distillation gas is retrieved to filling methanol, it includes methanol tank car (1), is equipped with mounting hole (2) and filling crane pipe fixed head (3) of mutually supporting on methanol tank car (1), filling crane pipe fixed head (3) including fixed head lateral wall (3-1) and apron (3-2) of mutually supporting with mounting hole (2), be fixed with on apron (3-2) and fill crane pipe (3-3), be equipped with methanol flash distillation gas storage tube (3-4) on filling crane pipe fixed head (3) of filling the crane pipe (3-3) outside, it is coaxial with methanol flash distillation gas storage tube (3-4) to fill crane pipe (3-3), its characterized in that: the methanol flash evaporation gas storage pipe (3-4) is connected with the lower end of the side wall (3-1) of the fixed head, a low-pressure nitrogen filling space (3-5) is formed among the methanol flash evaporation gas storage pipe (3-4), the side wall (3-1) of the fixed head, the cover plate (3-2) and the inner wall of the mounting hole (2), a methanol flash evaporation gas exhaust pipe (4) communicated with the methanol flash evaporation gas storage pipe (3-4) is arranged on the cover plate (3-2), the methanol flash evaporation gas exhaust pipe (4) is connected with a heat exchanger (5), a nitrogen channel for heat exchange is arranged on the heat exchanger (5), the inlet end and the outlet end of the nitrogen channel are respectively connected with a nitrogen tap pipe network (6) and a low-pressure nitrogen conveying pipe (7), the low-pressure nitrogen conveying pipe (7) is communicated with the low-pressure nitrogen filling space (3-5).

2. The methanol-filling flash gas recovery device according to claim 1, wherein: a sealing glue layer is arranged between the outer side of the side wall (3-1) of the fixed head and the inner wall of the mounting hole (2).

3. The methanol-filling flash gas recovery device according to claim 1, wherein: a liquid level meter (8) is arranged on the heat exchanger (5).

4. The methanol-filling flash gas recovery device according to claim 1, wherein: and a tail gas pipeline and a methanol calandria are arranged on the heat exchanger (5), and the methanol calandria is connected to the methanol recovery tank through a methanol pump.

5. The methanol-filling flash gas recovery device according to claim 1, wherein: the filling crane pipe (3-3) is connected with a methanol product pipeline.

6. The methanol-filling flash gas recovery device according to claim 1, wherein: an exhaust fan (9) is arranged on the methanol flash evaporation exhaust pipe (4).

7. The methanol-filling flash gas recovery device according to claim 1, wherein: a pressure reducing valve (10) is arranged on a pipeline between the nitrogen tap water pipe network (6) and the heat exchanger (5).