Tail gas recovery equipment for BDO hydrogenation device

Abstract

The utility model discloses tail gas recovery equipment for a BDO hydrogenation device, and relates to the technical field of BDO production assistance. The device comprises a circulating hydrogen separator, the rear side of the circulating hydrogen separator is connected with a hydrogen condenser, the rear side of the hydrogen condenser is connected with a hydrogen separator tank, and the rear side of the hydrogen separator tank is provided with a first methanol hydrogen extraction PSA device and a second methanol hydrogen extraction PSA device. A first hydrogen inlet pipe is fixedly arranged on the side wall of the upper portion of the first methanol hydrogen extraction PSA device, and a second hydrogen inlet pipe is fixedly arranged on the side wall of the upper portion of the second methanol hydrogen extraction PSA device. According to the utility model, the hydrogen separated from the hydrogen separator tank is alternately led into the first methanol hydrogen extraction PSA device and the second methanol hydrogen extraction PSA device, so that the hydrogen in the first methanol hydrogen extraction PSA device and the second methanol hydrogen extraction PSA device can be conveniently and alternately led out by personnel without stopping the tail gas recovery operation; therefore, the tail gas at the BDO hydrogenation device can be continuously recovered.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the production auxiliary technical field, especially, relate to a BDO hydrogenation device tail gas recovery equipment. BACKGROUND

[0002] BDO generally refers to 1,4-butanediol, is an organic matter, molecular formula is C4H10O2, it has a production process for n-butane / anhydride direct hydrogenation method, the process is the production method that gas phase oxidation method and anhydride hydrogenation technology of n-butane are combined into maleic acid, then in fixed bed reactor catalytic hydrogenation is generated BDO, the process omits anhydride dehydration, purification and esterification process, reduces the main process from 8 to 4, thereby shortens the entire flow, reduces the equipment number, and the investment cost can reduce 20%, and the production cost can save 25~40%.Through the retrieval, the patent with application No.202222520030.8 discloses a kind of BDO hydrogenation device tail gas recovery equipment, including ring hydrogen gas condenser and hydrogen compressor, the circulating hydrogen gas condenser is communicated with circulating hydrogen gas separator and public torch by pipeline, the circulating hydrogen gas separator is communicated with public engineering pipeline valve and hydrogen compressor by pipeline, the public engineering pipeline valve is communicated with first hydrogen condenser by pipeline, the first hydrogen condenser is communicated with hydrogen gas separator tank and methanol hydrogen extraction PSA device by pipeline.

[0003] But in the process of actual use, the applicant finds that when the hydrogen collected in the interior of methanol hydrogen extraction PSA device is guided out, the recovery operation of tail gas needs to be stopped, so that the continuous recovery of tail gas cannot be realized, in view of this, we propose a kind of BDO hydrogenation device tail gas recovery equipment. Utility model content

[0004] To solve the above technical problems, the utility model is realized through the following technical schemes:

[0005] The utility model relates to a kind of BDO hydrogenation device tail gas recovery equipment, including circulating hydrogen separator, the rear side of circulating hydrogen separator is connected with hydrogen condenser, the rear side of hydrogen condenser is connected with hydrogen separator tank, the rear side of hydrogen separator tank is provided with first methanol hydrogen extraction PSA device and second methanol hydrogen extraction PSA device, the side wall on the upper part of first methanol hydrogen extraction PSA device is fixedly provided with hydrogen gas inlet pipe one, the side wall on the upper part of second methanol hydrogen extraction PSA device is fixedly provided with hydrogen gas inlet pipe two, hydrogen gas inlet pipe one and hydrogen gas inlet pipe two are all communicated with the rear end of gas branch pipe two on hydrogen separator tank, gas valve one is fixedly sleeved on hydrogen gas inlet pipe one, gas valve two is fixedly sleeved on hydrogen gas inlet pipe two, hydrogen gas outlet pipe one is fixedly provided on the first methanol hydrogen extraction PSA device below hydrogen gas inlet pipe one, hydrogen gas outlet pipe two is fixedly provided on the second methanol hydrogen extraction PSA device below hydrogen gas inlet pipe two, gas compressor is provided on the rear side of hydrogen separator tank, the gas inlet end of gas compressor is fixedly provided with gas guide branch pipe, hydrogen gas outlet pipe one and hydrogen gas outlet pipe two are all communicated with the front end of gas guide branch pipe, gas valve three is fixedly sleeved on hydrogen gas outlet pipe one, gas valve four is fixedly sleeved on hydrogen gas outlet pipe two.

[0006] Preferably, the outer wall of the front side of the circulating hydrogen separator is fixedly provided with an inlet branch pipe one, and the outer wall of the rear side of the circulating hydrogen separator is fixedly provided with an outlet branch pipe one.

[0007] Preferably, the rear end of the outlet branch pipe one is fixedly connected with the gas inlet end of the hydrogen condenser.

[0008] Preferably, the outer wall of the front side of the hydrogen separator tank is fixedly provided with an inlet branch pipe two, and the front end of the inlet branch pipe two is fixedly connected with the gas outlet end of the hydrogen condenser.

[0009] Preferably, the bottom of the hydrogen separator tank is provided with a liquid discharge branch pipe, and a valve is fixedly sleeved on the liquid discharge branch pipe.

[0010] Preferably, the gas outlet end of the gas compressor is connected with an external hydrogen recovery tank through a pipeline.

[0011] The utility model has the following beneficial effects:

[0012] The utility model discloses a BDO hydrogenation device tail gas recovery equipment, through the hydrogen obtained in the hydrogen separator tank is alternately introduced in the first methanol hydrogen extraction PSA device and the first methanol hydrogen extraction PSA device, can be convenient for personnel and alternately export the hydrogen in the first methanol hydrogen extraction PSA device and the first methanol hydrogen extraction PSA device, need not stop the recovery operation to tail gas, thereby can realize the continuous recovery to the tail gas at BDO hydrogenation device, through the gas compressor that sets up, can be compressed and transported to the hydrogen recovery tank outside in the hydrogen that collects, make the recovery effect of tail gas better. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduce, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0014] Figure 1 It is the front view structural schematic drawing of a kind of BDO hydrogenation device tail gas recovery equipment of the utility model;

[0015] Figure 2 It is the rear view structural schematic drawing of a kind of BDO hydrogenation device tail gas recovery equipment of the utility model;

[0016] Figure 3 It is a kind of BDO hydrogenation device tail gas recovery equipment of the utility model Figure 2 The enlarged view of structure in A.

[0017] In the drawing, the component list represented by each sign is as follows:

[0018] 1, circulating hydrogen separator;11, gas inlet branch pipe one;12, gas outlet branch pipe one;2, hydrogen condenser;3, hydrogen separator tank;31, gas inlet branch pipe two;32, gas outlet branch pipe two;33, liquid discharge branch pipe;4, first methanol hydrogen extraction PSA device;41, hydrogen inlet pipe one;42, hydrogen outlet pipe one;5, second methanol hydrogen extraction PSA device;51, hydrogen inlet pipe two;52, hydrogen outlet pipe two;6, gas compressor;61, gas guide branch pipe;7, gas valve one;8, gas valve two;9, gas valve three;10, gas valve four. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0020] Please refer to Figures 1-3 The present application provides a technical scheme:

[0021] The application discloses a tail gas recovery device for a BDO hydrogenation device, which comprises a circulating hydrogen separator 1, an air inlet branch pipe I 11 fixedly arranged on the outer wall of the front side of the circulating hydrogen separator 1, an air outlet branch pipe I 12 fixedly arranged on the outer wall of the rear side of the circulating hydrogen separator 1, a hydrogen condenser 2 connected to the rear side of the circulating hydrogen separator 1, a rear end of the air outlet branch pipe I 12 fixedly connected with an air inlet end of the hydrogen condenser 2, a hydrogen separator tank 3 connected to the rear side of the hydrogen condenser 2, and the hydrogen temperature can be effectively reduced by the hydrogen condenser 2, so that the removal effect of organic alcohol is improved, the hydrogen and the organic alcohol can be well separated in the hydrogen separator tank 3, an air inlet branch pipe II 31 is fixedly arranged on the outer wall of the front side of the hydrogen separator tank 3, a front end of the air inlet branch pipe II 31 is fixedly connected with an air outlet end of the hydrogen condenser 2, a liquid discharge branch pipe 33 is arranged on the bottom of the hydrogen separator tank 3 and is sleeved with a valve, a first methanol hydrogen extraction PSA device 4 and a second methanol hydrogen extraction PSA device 5 are arranged on the rear side of the hydrogen separator tank 3, a hydrogen inlet pipe I 41 is fixedly arranged on the side wall of the upper portion of the first methanol hydrogen extraction PSA device 4, a hydrogen inlet pipe II 51 is fixedly arranged on the side wall of the upper portion of the second methanol hydrogen extraction PSA device 5, the hydrogen inlet pipe I 41 and the hydrogen inlet pipe II 51 are both in communication with the rear end of an air outlet branch pipe II 32 on the hydrogen separator tank 3, an air valve I 7 is sleeved and fixed on the hydrogen inlet pipe I 41, and an air valve II 8 is sleeved and fixed on the hydrogen inlet pipe II 51, the hydrogen separated in the hydrogen separator tank 3 can be alternately introduced into the first methanol hydrogen extraction PSA device 4 and the second methanol hydrogen extraction PSA device 5, the hydrogen in the first methanol hydrogen extraction PSA device 4 and the second methanol hydrogen extraction PSA device 5 can be alternately discharged without stopping the tail gas recovery operation, so that the continuous recovery of the tail gas of the BDO hydrogenation device can be realized, when in use, the tail gas with high pressure can be introduced into the inside of the circulating hydrogen separator 1 from the air inlet branch pipe I 11, the gas is decompressed to 6200kPa by the circulating hydrogen separator 1, the temperature is controlled to be 70 DEG C, then the gas is discharged to the hydrogen condenser 2 through the air outlet branch pipe I 12, the gas is continuously cooled to 40 DEG C by the hydrogen condenser 2, the hydrogen after cooling can enter the hydrogen separator tank 3 through the air inlet branch pipe II 31 to be subjected to pressure swing adsorption and be collected in the hydrogen separator tank 3, at this time, the air valve I 7 is in an open state and the air valve II 8 is in a closed state, the hydrogen collected in the hydrogen separator tank 3 can be conveyed to the first methanol hydrogen extraction PSA device 4 from the hydrogen inlet pipe I 41, when the hydrogen in the first methanol hydrogen extraction PSA device 4 needs to be discharged, the air valve II 8 can be opened and the air valve I 7 can be closed, at this time, the hydrogen collected in the first methanol hydrogen extraction PSA device 4 can be discharged, meanwhile, the hydrogen in the hydrogen separator tank 3 can be conveyed to the second methanol hydrogen extraction PSA device 5 through the hydrogen inlet pipe II 51 to be collected, when the hydrogen in the second methanol hydrogen extraction PSA device 5 needs to be discharged, the air valve I 7 can be opened again and the air valve II 8 can be closed, the above operation is repeatedly carried out alternately.That is, the hydrogen gas can be discharged while the tail gas is continuously recovered.

[0022] The hydrogen gas outlet pipe one 42 is fixedly arranged on the first methanol hydrogen extraction PSA device 4 below the hydrogen gas inlet pipe one 41, the hydrogen gas outlet pipe two 52 is fixedly arranged on the second methanol hydrogen extraction PSA device 5 below the hydrogen gas inlet pipe two 51, the gas compressor 6 is arranged at the rear side of the hydrogen gas separator tank 3, the gas inlet end of the gas compressor 6 is fixedly arranged with the gas branch pipe 61, the hydrogen gas outlet pipe one 42 and the hydrogen gas outlet pipe two 52 are both in communication with the front end of the gas branch pipe 61, the gas valve three 9 is fixedly sleeved on the hydrogen gas outlet pipe one 42, the gas valve four 10 is fixedly sleeved on the hydrogen gas outlet pipe two 52, the gas outlet end of the gas compressor 6 is connected with the external hydrogen recovery tank through the pipeline, the collected hydrogen gas can be compressed and then transported into the external hydrogen recovery tank through the arranged gas compressor 6, so that the recovery effect of the tail gas is better, when the hydrogen gas in the first methanol hydrogen extraction PSA device 4 is discharged, the gas valve three 9 is opened and the gas valve four 10 is closed, at this time, the hydrogen gas in the first methanol hydrogen extraction PSA device 4 can enter the inside of the gas compressor 6 through the hydrogen gas outlet pipe one 42 and the gas branch pipe 61, and then be transported into the external hydrogen recovery tank after being compressed by the gas compressor 6, when the hydrogen gas in the second methanol hydrogen extraction PSA device 5 needs to be discharged, the gas valve three 9 is closed and the gas valve four 10 is opened, at this time, the hydrogen gas in the second methanol hydrogen extraction PSA device 5 can enter the inside of the gas compressor 6 through the hydrogen gas outlet pipe two 52 and the gas branch pipe 61, and then be transported into the external hydrogen recovery tank after being compressed by the gas compressor 6, so as to complete the recovery of the tail gas.

[0023] Working principle: when in use, the tail gas with high pressure can be introduced into the inside of the circulating hydrogen gas separator 1 from the gas inlet branch pipe 1, and the circulating hydrogen gas separator 1 is used to reduce the pressure of the gas to 6200kPa, and the temperature is controlled at 70℃, then the gas is guided out to the hydrogen gas condenser 2 through the gas outlet branch pipe 1, and the hydrogen gas condenser 2 is used to continue to reduce the temperature of the gas to 40℃, and the hydrogen gas after the temperature reduction can enter the hydrogen gas separator tank 3 through the gas inlet branch pipe 2 to carry out pressure swing adsorption and be collected in the hydrogen gas separator tank 3, at this time, the gas valve 1 is opened, and the gas valve 2 is closed, and the hydrogen gas collected in the hydrogen gas separator tank 3 can be transported to the first methanol hydrogen extraction PSA device 4 from the hydrogen gas inlet pipe 1, when the hydrogen gas in the first methanol hydrogen extraction PSA device 4 needs to be guided out, the gas valve 2 can be opened, and the gas valve 1 is closed, at this time, the hydrogen gas collected in the first methanol hydrogen extraction PSA device 4 can be guided out, and the hydrogen gas in the hydrogen gas separator tank 3 can be transported to the second methanol hydrogen extraction PSA device 5 through the hydrogen gas inlet pipe 2, when the hydrogen gas in the second methanol hydrogen extraction PSA device 5 needs to be guided out, the gas valve 1 is opened again, and the gas valve 2 is closed, and the above operation is repeated alternately, so that the hydrogen gas can be guided out while the tail gas is continuously recovered, when the hydrogen gas in the first methanol hydrogen extraction PSA device 4 needs to be guided out, the gas valve 3 is opened, and the gas valve 4 is closed, at this time, the hydrogen gas in the first methanol hydrogen extraction PSA device 4 can enter the inside of the gas compressor 6 through the hydrogen gas outlet pipe 1 and the gas guide branch pipe 6, and after being compressed by the gas compressor 6, the hydrogen gas is transported to the outside hydrogen gas recovery tank, when the hydrogen gas in the second methanol hydrogen extraction PSA device 5 needs to be guided out, the gas valve 3 is closed, and the gas valve 4 is opened, at this time, the hydrogen gas in the second methanol hydrogen extraction PSA device 5 can enter the inside of the gas compressor 6 through the hydrogen gas outlet pipe 2 and the gas guide branch pipe 6, and after being compressed by the gas compressor 6, the hydrogen gas is transported to the outside hydrogen gas recovery tank, so as to complete the recovery of the tail gas.

[0024] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0025] The above is only the preferred embodiment of the present application, and does not limit the present application, any modification to the technical solutions described in the foregoing embodiments, and equivalent replacement of part of the technical features, all belong to the protection scope of the present application.

Claims

1. A BDO hydrogenation plant off-gas recovery apparatus comprising a recycle hydrogen gas separator (1), characterised in that: The rear side of the circulating hydrogen separator (1) is connected with a hydrogen condenser (2), the rear side of the hydrogen condenser (2) is connected with a hydrogen separator tank (3), the rear side of the hydrogen separator tank (3) is provided with a first methanol hydrogen extraction PSA device (4) and a second methanol hydrogen extraction PSA device (5), the side wall of the upper part of the first methanol hydrogen extraction PSA device (4) is fixedly provided with a hydrogen inlet pipe one (41), the side wall of the upper part of the second methanol hydrogen extraction PSA device (5) is fixedly provided with a hydrogen inlet pipe two (51), the hydrogen inlet pipe one (41) and the hydrogen inlet pipe two (51) are in communication with the rear end of the gas branch pipe two (32) on the hydrogen separator tank (3), the hydrogen inlet pipe one (41) is sleeved with a gas valve one (7), the hydrogen inlet pipe two (51) is sleeved with a gas valve two (8), the hydrogen inlet pipe one (41) is fixedly provided with a hydrogen outlet pipe one (42) below the first methanol hydrogen extraction PSA device (4), the hydrogen inlet pipe two (51) is fixedly provided with a hydrogen outlet pipe two (52) below the second methanol hydrogen extraction PSA device (5), the rear side of the hydrogen separator tank (3) is provided with a gas compressor (6), the gas inlet end of the gas compressor (6) is fixedly provided with a gas guide branch pipe (61), the hydrogen outlet pipe one (42) and the hydrogen outlet pipe two (52) are in communication with the front end of the gas guide branch pipe (61), the hydrogen outlet pipe one (42) is sleeved with a gas valve three (9), and the hydrogen outlet pipe two (52) is sleeved with a gas valve four (10).

2. A BDO hydrogenation unit off-gas recovery apparatus according to claim 1, characterized in that, The outer wall of the front side of the circulating hydrogen separator (1) is fixedly provided with a gas inlet branch pipe one (11), and the outer wall of the rear side of the circulating hydrogen separator (1) is fixedly provided with a gas outlet branch pipe one (12).

3. A BDO hydrogenation unit off-gas recovery apparatus according to claim 2, characterized in that, The rear end of the gas outlet branch pipe one (12) is fixedly connected with the gas inlet end of the hydrogen condenser (2).

4. The BDO hydrogenation unit off-gas recovery apparatus of claim 1, wherein, The outer wall of the front side of the hydrogen separator tank (3) is fixedly provided with a gas inlet branch pipe two (31), and the front end of the gas inlet branch pipe two (31) is fixedly connected with the gas outlet end of the hydrogen condenser (2).

5. The BDO hydrogenation unit off-gas recovery apparatus of claim 1, wherein, The bottom of the hydrogen separator tank (3) is provided with a liquid discharge branch pipe (33), and the liquid discharge branch pipe (33) is sleeved with a valve.

6. The BDO hydrogenation unit off-gas recovery apparatus of claim 1, wherein, The gas outlet end of the gas compressor (6) is connected with an external hydrogen recovery tank through a pipeline.

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