Tail gas recovery system based on triple compressor

Abstract

A tail gas recovery system based on a triple compressor is characterized in that the tail gas recovery system receives tail gas and recovers hydrogen in the tail gas; the tail gas recovery system comprises a condensation area for receiving tail gas and cooling the tail gas; the boosting area is connected with the condensing area, receives the cooled tail gas from the condensing area and boosts the tail gas, and the pressure in the boosting area is kept consistent; the absorption area is connected with the boosting area and is used for receiving the boosted tail gas from the boosting area and extracting hydrogen; the standby compressor is respectively connected with the boosting area and the absorption area, operates when the boosting area is insufficient in boosting, receives and boosts the tail gas from the boosting area, and transmits the tail gas to the absorption area. The inlets and the outlets of the two main compressors are communicated, so that the standby compressor is standby for the two main compressors, and the running rate of equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas recovery field especially relates to a tail gas recovery system based on interconnection compressor. BACKGROUND

[0002] Because hydrogen compressor in CDI (Chemical Design, Inc, chemical design) process, undertake for the high pressure condition of absorption creation, and then reach the role of absorption hydrogen guarantee its purity, play the indispensable role in the whole system, single set system compressor is often one open one spare, two sets of system will produce two standby compressors, for the benefit of production and guarantee system safe and stable operation, solve the emergency operation problem when the dynamic equipment is abnormal, improve the dynamic equipment operation rate, need two sets of system share a standby compressor. SUMMARY

[0003] The utility model discloses a tail gas recovery system based on three compressor units, which is used for realizing efficient tail gas recovery, receiving tail gas and recovering hydrogen in the tail gas.

[0004] Preferably, the condensing area comprises: a first condensing section connected with the pressure increasing area, receiving the tail gas and cooling it; and a second condensing section connected with the pressure increasing area, receiving the tail gas and cooling it.

[0005] Preferably, the absorption area comprises: a first absorption system connected with the standby compressor and the pressure increasing area respectively, receiving the tail gas after pressure increasing from the pressure increasing area and extracting hydrogen; and a second absorption system connected with the standby compressor and the pressure increasing area respectively, receiving the tail gas after pressure increasing from the pressure increasing area and extracting hydrogen.

[0006] Preferably, the pressure boosting area comprises: a first main compressor connected with the first condensing section, the standby compressor and the first absorption system respectively, receiving the cooled exhaust gas from the first condensing section and boosting the pressure thereof; a second main compressor connected with the second condensing section, the standby compressor and the second absorption system respectively, receiving the cooled exhaust gas from the second condensing section and boosting the pressure thereof; the first main compressor and the second main compressor are in pressure communication with each other, and the pressure in the first main compressor and the second main compressor is consistent when the first main compressor and the second main compressor are in operation.

[0007] Preferably, the pressure boosting area further comprises: a first butterfly valve having one end connected with the first main compressor and the other end connected with the standby compressor; and a second butterfly valve having one end connected with the first main compressor and the other end connected with the standby compressor.

[0008] Preferably, the pressure boosting area further comprises: the first butterfly valve and the second butterfly valve are provided with a plurality of pressure holes on the surfaces thereof, and the pressure in the first main compressor and the second main compressor is consistent when the first butterfly valve and the second butterfly valve are closed.

[0009] Preferably, the exhaust gas recovery system further comprises: a first ball valve having one end connected with the standby compressor and the other end connected with the first absorption system, and being in a closed state by default; and a second ball valve having one end connected with the standby compressor and the other end connected with the second absorption system, and being in a closed state by default.

[0010] Preferably, the first ball valve, the second ball valve, the first butterfly valve, the second butterfly valve and the pressure boosting area are provided with sensing controllers, and the sensing controllers are in signal connection with each other; the sensing controllers on the first ball valve, the second ball valve, the first butterfly valve and the second butterfly valve receive the pressure in the pressure boosting area, and the opening of the first ball valve, the second ball valve, the first butterfly valve and the second butterfly valve is controlled when the pressure boosting area is insufficient in pressure boosting, so that the normal operation of the exhaust gas recovery system is realized.

[0011] In summary, compared with the prior art, the exhaust gas recovery system based on the triple compressor has the following beneficial effects:

[0012] Firstly, the two sets of main compressors are in communication with each other, so that the standby compressor is used for standby of the two main compressors, and the equipment operation rate is improved.

[0013] Secondly, the equipment maintenance frequency and cost are reduced, and the equipment cost is reduced. DRAWINGS

[0014] Figure 1 A schematic view of the exhaust gas recovery system based on the triple compressor is shown in the drawings.

[0015] Reference signs:

[0016] 1 - first condensing section, 2 - second condensing section, 3 - first main compressor, 4 - second main compressor, 5 - first butterfly valve, 6 - second butterfly valve, 7 - first absorption system, 8 - second absorption system, 9 - first ball valve, 10 - second ball valve, 11 - standby compressor. DETAILED DESCRIPTION

[0017] The technical solutions, structural features, purposes achieved and effects of the embodiments of the present application will be described in detail below with reference to the accompanying drawings of the embodiments of the present application. Figure 1 The technical solutions, structural features, purposes achieved and effects of the embodiments of the present application will be described in detail below with reference to the accompanying drawings of the embodiments of the present application.

[0018] It should be noted that the drawings are greatly simplified and all use non-precise proportions, only to facilitate and clarify the purpose of assisting in the description of the embodiments of the present application, and are not intended to limit the scope of the present application, therefore, any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0019] It should be noted that in the present application, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes the explicitly listed elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0020] The present application provides a tail gas recovery system based on a three-cylinder compressor, because the production conditions of low temperature and high pressure need to be reached when recovering hydrogen from tail gas, so the piston compressor becomes an indispensable device, the present application designs a three-cylinder compressor system to recover hydrogen from tail gas; the tail gas recovery system comprises:

[0021] A condensing area receives tail gas and cools it down;

[0022] A pressure boosting area is connected to the condensing area, receives the cooled down tail gas from the condensing area, and boosts the pressure of the cooled down tail gas, the pressure in the pressure boosting area remains consistent;

[0023] An absorption area is connected to the pressure boosting area, receives the boosted pressure tail gas from the pressure boosting area, and extracts hydrogen; as for how to extract, it is prior art and will not be described here.

[0024] The standby compressor 11 is connected with the pressure boosting area and the absorption area respectively, and is operated when the pressure boosting area is insufficient in pressure boosting, receives the tail gas from the pressure boosting area, boosts the pressure of the tail gas, and then transmits the tail gas to the absorption area.

[0025] In the specific embodiment, the condensing area comprises:

[0026] The first condensing section 1 is connected with the pressure boosting area, receives the tail gas (80-120℃), and cools the tail gas (-7- -17℃);

[0027] The second condensing section 2 is connected with the pressure boosting area, receives the tail gas (80-120℃), and cools the tail gas (-7- -17℃);

[0028] The purpose of using two condensing sections is to maximize the cooling efficiency by cooling the tail gas at different temperatures.

[0029] Similarly, the absorption area comprises:

[0030] The first absorption system 7 is connected with the standby compressor 11 and the pressure boosting area respectively, receives the tail gas boosted by the pressure boosting area, and extracts hydrogen gas;

[0031] The second absorption system 8 is connected with the standby compressor 11 and the pressure boosting area respectively, receives the tail gas boosted by the pressure boosting area, and extracts hydrogen gas;

[0032] The two absorption systems correspond to the tail gas in the two condensing sections, so as to realize directional processing.

[0033] Further, based on the foregoing embodiment, the pressure boosting area comprises:

[0034] The first main compressor 3 is connected with the first condensing section 1, the standby compressor 11 and the first absorption system 7 respectively, receives the tail gas cooled by the first condensing section 1, and boosts the pressure of the tail gas;

[0035] The second main compressor 4 is connected with the second condensing section 2, the standby compressor 11 and the second absorption system 8 respectively, receives the tail gas cooled by the second condensing section 2, and boosts the pressure of the tail gas;

[0036] The first main compressor 3 and the second main compressor 4 are in pressure communication with each other, so that the pressure in the first main compressor 3 and the second main compressor 4 is consistent when the first main compressor 3 and the second main compressor 4 are operated.

[0037] Specifically, in some cases, it is necessary to prevent the gas in the first main compressor 3 and the second main compressor 4 from colliding with each other when the first main compressor 3 and the second main compressor 4 are operated; the pressure boosting area further comprises:

[0038] The first butterfly valve 5 is connected with the first main compressor 3 at one end and connected with the standby compressor 11 at the other end.

[0039] The second butterfly valve 6 is connected with the second main compressor 4 at one end and connected with the standby compressor 11 at the other end.

[0040] Thus, the opening and closing of the passage between the first main compressor 3 and the second main compressor 4 are realized.

[0041] In the preferred embodiment, the tail gas recovery system further comprises:

[0042] The first ball valve 9 is connected with the standby compressor 11 at one end and connected with the first absorption system 7 at the other end, and is in a closed state by default.

[0043] The second ball valve 10 is connected with the standby compressor 11 at one end and connected with the second absorption system 8 at the other end, and is in a closed state by default.

[0044] Specifically, in order to facilitate the opening of the first ball valve 9 and the second ball valve 10, a sensing controller is arranged on the first ball valve 9, the second ball valve 10, the first butterfly valve 5, the second butterfly valve 6 and inside the pressure increasing area, the sensing controllers are signal connected with each other, and the sensors on the first ball valve 9, the second ball valve 10, the first butterfly valve 5 and the second butterfly valve 6 receive the pressure inside the pressure increasing area.

[0045] The utility model discloses a mode that one compressor is the standby compressor of two compressors, and the inlet and outlet of the two compressors are communicated, which realizes mutual standby, improves equipment operation rate, reduces dynamic equipment maintenance frequency and cost, and reduces the cost of purchasing dynamic equipment.

[0046] Although the content of the utility model has been introduced in detail through the above preferred embodiment, it should be recognized that the above description should not be considered as the limitation of the utility model. After the above content is read by the person skilled in the art, various modifications and substitutions of the utility model will be obvious. Therefore, the protection scope of the utility model should be limited by the appended claims.

Claims

1. A tail gas recovery system based on a triple compressor, characterized in that, The tail gas recovery system receives tail gas and recovers hydrogen in the tail gas; the tail gas recovery system comprises: a condensing area receiving tail gas and cooling the tail gas; a pressure boosting area connected with the condensing area, receiving the cooled tail gas from the condensing area and boosting the pressure of the cooled tail gas, the pressure in the pressure boosting area being kept uniform; an absorption area connected with the pressure boosting area, receiving the boosted tail gas from the pressure boosting area and extracting hydrogen from the boosted tail gas; a standby compressor (11) connected with the pressure boosting area and the absorption area respectively, operating when the pressure boosting area fails to boost the pressure, receiving the tail gas from the pressure boosting area, boosting the pressure of the tail gas and transmitting the boosted tail gas to the absorption area.

2. A tail gas recovery system based on a triple compressor according to claim 1, characterized in that, The condensing area comprises: a first condensing section (1) connected with the pressure boosting area, receiving tail gas and cooling the tail gas; a second condensing section (2) connected with the pressure boosting area, receiving tail gas and cooling the tail gas.

3. A tail gas recovery system based on a triple compressor according to claim 2, characterized in that, The absorption area comprises: a first absorption system (7) connected with the standby compressor (11) and the pressure boosting area respectively, receiving the boosted tail gas from the pressure boosting area and extracting hydrogen from the boosted tail gas; a second absorption system (8) connected with the standby compressor (11) and the pressure boosting area respectively, receiving the boosted tail gas from the pressure boosting area and extracting hydrogen from the boosted tail gas.

4. The tail gas recovery system based on a triple compressor of claim 3, characterized in that, The pressure boosting area comprises: a first main compressor (3) connected with the first condensing section (1), the standby compressor (11) and the first absorption system (7) respectively, receiving the cooled tail gas from the first condensing section (1) and boosting the pressure of the cooled tail gas; a second main compressor (4) connected with the second condensing section (2), the standby compressor (11) and the second absorption system (8) respectively, receiving the cooled tail gas from the second condensing section (2) and boosting the pressure of the cooled tail gas; The first main compressor (3) and the second main compressor (4) are in pressure communication with each other, and the pressure in the first main compressor (3) and the second main compressor (4) is kept uniform when the first main compressor (3) and the second main compressor (4) are operating.

5. A tail gas recovery system based on a triple compressor according to claim 4, characterized in that, The pressure boosting area further comprises: a first butterfly valve (5) connected with the first main compressor (3) at one end and connected with the standby compressor (11) at the other end; a second butterfly valve (6) connected with the first main compressor (3) at one end and connected with the standby compressor (11) at the other end.

6. A tail gas recovery system based on a triple compressor according to claim 5, characterized in that, The pressure boosting area further comprises: the first butterfly valve (5) and the second butterfly valve (6) are provided with a plurality of pressure holes on the surfaces thereof, and the pressure in the first main compressor (3) and the second main compressor (4) is kept uniform when the first butterfly valve (5) and the second butterfly valve (6) are closed.

7. A tail gas recovery system based on a triple compressor according to claim 6, characterized in that, The tail gas recovery system further comprises: a first ball valve (9) connected with the standby compressor (11) at one end and connected with the first absorption system (7) at the other end, being kept closed by default, and being opened when the first butterfly valve (5) and the first ball valve (9) are opened when the pressure boosting area fails to boost the pressure; a second ball valve (10) connected with the standby compressor (11) at one end and connected with the second absorption system (8) at the other end, being kept closed by default, and being opened when the first butterfly valve (5) and the first ball valve (9) are opened when the pressure boosting area fails to boost the pressure.

8. A tail gas recovery system based on a triple compressor according to claim 7, characterized in that, Sensing controllers are arranged on the first ball valve (9), the second ball valve (10), the first butterfly valve (5), the second butterfly valve (6) and inside the pressure boosting area, the sensing controllers are signal connected with each other, the sensors on the first ball valve (9), the second ball valve (10), the first butterfly valve (5) and the second butterfly valve (6) receive the pressure inside the pressure boosting area, when the pressure boosting of the pressure boosting area is insufficient, the opening of the first ball valve (9), the second ball valve (10), the first butterfly valve (5) and the second butterfly valve (6) is controlled, and the normal operation of the tail gas recovery system is realized.

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