CN105565270A - Device and process for recovering hydrogen in synthetic ammonia purge gas - Google Patents
Device and process for recovering hydrogen in synthetic ammonia purge gas Download PDFInfo
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- CN105565270A CN105565270A CN201610087491.7A CN201610087491A CN105565270A CN 105565270 A CN105565270 A CN 105565270A CN 201610087491 A CN201610087491 A CN 201610087491A CN 105565270 A CN105565270 A CN 105565270A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
- C01B3/501—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by diffusion
- C01B3/503—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by diffusion characterised by the membrane
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/12—Separation of ammonia from gases and vapours
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention belongs to a device and process for recovering hydrogen in synthetic ammonia purge gas. The device comprises a synthetic system purge gas pipeline, a synthetic system high-pressure nitrogen and hydrogen compressor first-section inlet and an LNG production device, wherein the synthetic system purge gas pipeline is connected with a middle inlet of a head-end membrane separation device of a membrane separation unit through an ammonia recovery device and a shell pass of a heater, a hydrogen outlet formed in the top of the membrane separation unit is connected with the synthetic system high-pressure nitrogen and hydrogen compressor first-section inlet through a pipe, and a bottom tail gas outlet of a tail-end membrane separation device of the membrane separation unit is connected with the LNG production device through a pipe. The device has the advantages of being simple, convenient to operate, reliable in operation and capable of achieving effective product utilization and reducing environmental pollution while saving energy and reducing consumption.
Description
Technical field
The invention belongs to synthetic ammonia periodic off-gases recovery and reuse technology field, be specifically related to retrieving arrangement and the recovery process of hydrogen in a kind of synthetic ammonia periodic off-gases.
Background technology
In ammonia synthesis process, for improving ammonia content, ensure that synthesis system inert gas content does not exceed standard, unnecessary gas needs emptying, and namely this part gas be tower top periodic off-gases.In most of nitrogenous fertilizer enterprises recovery periodic off-gases after ammonia, two kinds for the treatment of processs are mainly contained to Ammonic washing tower tail gas: one is be sent to blowing boiler to use as fuel, and this method shortcoming is thermal waste, contaminate environment; Two is by the H in pressure-swing absorption apparatus removing periodic off-gases
2, this method shortcoming is H
2the rate of recovery is low.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art and provide that a kind of equipment is simple, easy to operate, reliable, effective utilization that can realize product energy-saving and cost-reducing while and retrieving arrangement and the recovery process of hydrogen in a kind of synthetic ammonia periodic off-gases of environmental pollution can be reduced.
The object of the present invention is achieved like this: comprise synthesis system periodic off-gases pipeline, synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance, LNG production equipment, synthesis system periodic off-gases pipeline is connected with the centre inlet of the shell side of well heater with the head end membrane separation unit of film separation unit by ammonia recovery unit, the hydrogen outlet at the top of described film separation unit is connected by pipeline and synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance, and the bottom offgas outlet of film separation unit end membrane separation unit is connected with LNG production equipment by pipeline.
Described film separation unit comprises the series connection of several membrane separation units, the hydrogen outlet at several membrane separation unit tops is connected respectively by pipeline and synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance, shortcut pipeline is provided with between the bottom offgas outlet of two adjacent membrane separation units, described shortcut pipeline is provided with shortcut pipeline valve, bottom described end membrane separation unit, offgas outlet is provided with the first valve, is respectively equipped with the second valve between the hydrogen outlet at several membrane separation unit tops described and synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance.
Be provided with hydrogen content thief hole between described first valve and corresponding shortcut pipeline, be provided with threeway between the first valve and LNG production equipment, the 3rd end of threeway is connected with blowing air post; Be provided with the 3rd valve between described threeway and LNG production equipment, between the 3rd end of threeway and blowing air post, be provided with the 4th valve.
Stopping valve is provided with between offgas outlet and a rear membrane separation unit import bottom described membrane separation unit.
Described membrane separation unit is five.
Under meter is provided with between described synthesis system periodic off-gases pipeline and ammonia recovery unit.
In synthetic ammonia periodic off-gases, a recovery process for the retrieving arrangement of hydrogen, comprises the steps:
Step one: the ducted periodic off-gases of synthesis system periodic off-gases enters in film separation unit by the shell side of ammonia recovery unit and well heater, the flow of under meter to periodic off-gases detects, the ammonia content of periodic off-gases after ammonia recovery unit is less than 200PPm, and the periodic off-gases that ammonia content is less than 200PPm enters shell side post-heating to 40 ~ 50 DEG C of well heater;
Step 2: the flow detecting periodic off-gases when the under meter described in step one is greater than 6000Nm
3during/h, closeall shortcut pipeline valve, open stopping valve, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance by the hydrogen after film separation unit by the hydrogen outlet at several membrane separation unit tops in film separation unit, describedly enter in LNG production equipment by the tail gas after film separation unit by the first valve, threeway and the 3rd valve; Described tail gas is sampled by hydrogen content thief hole, and the hydrogen content in tail gas is not more than 30%;
Step 3: in described step 2 during the full production of LNG production equipment, closes the 3rd valve, opens the 4th valve, make unnecessary tail gas enter in blowing air post by the first valve, threeway and the 4th valve;
Step 4: the flow detecting periodic off-gases when the under meter described in step one is greater than 4500Nm
3/ h, and be less than 6000Nm
3during/h, open four membrane separation units in film separation unit, the shortcut pipeline valve in the membrane separation unit do not opened is opened, stopping valve in the membrane separation unit do not opened is closed; Shortcut pipeline valve corresponding in four membrane separation units opened is closed, corresponding stopping valve is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance by the hydrogen after film separation unit by the hydrogen outlet at four membrane separation unit tops in film separation unit, describedly enter in LNG production equipment by the tail gas after film separation unit by the first valve, threeway and the 3rd valve; Described tail gas is sampled by hydrogen content thief hole, and the hydrogen content in tail gas is not more than 30%;
Step 5: in described step 4 during the full production of LNG production equipment, closes the 3rd valve, opens the 4th valve, make unnecessary tail gas enter in blowing air post by the first valve, threeway and the 4th valve;
Step 6: the flow detecting periodic off-gases when the under meter described in step one is greater than 3000Nm
3/ h, and be less than 4500Nm
3during/h, open three membrane separation units in film separation unit, the shortcut pipeline valve in the membrane separation unit do not opened is opened, stopping valve in the membrane separation unit do not opened is closed; Shortcut pipeline valve corresponding in three membrane separation units opened is closed, corresponding stopping valve is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance by the hydrogen after film separation unit by the hydrogen outlet at three membrane separation unit tops in film separation unit, describedly enter in LNG production equipment by the tail gas after film separation unit by the first valve, threeway and the 3rd valve; Described tail gas is sampled by hydrogen content thief hole, and the hydrogen content in tail gas is not more than 30%;
Step 7: in described step 6 during the full production of LNG production equipment, closes the 3rd valve, opens the 4th valve, make unnecessary tail gas enter in blowing air post by the first valve, threeway and the 4th valve;
Step 8: the flow detecting periodic off-gases when the under meter described in step one is greater than 1500Nm
3/ h, and be less than 3000Nm
3during/h, open two membrane separation units in film separation unit, the shortcut pipeline valve in the membrane separation unit do not opened is opened, stopping valve in the membrane separation unit do not opened is closed; Shortcut pipeline valve corresponding in two membrane separation units opened is closed, corresponding stopping valve is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor one section of entrance by the hydrogen after film separation unit by the hydrogen outlet at two membrane separation unit tops in film separation unit, describedly enter in LNG production equipment by the tail gas after film separation unit by the first valve, threeway and the 3rd valve; Described tail gas is sampled by hydrogen content thief hole, and the hydrogen content in tail gas is not more than 30%;
Step 9: in described step 6 during the full production of LNG production equipment, closes the 3rd valve, opens the 4th valve, unnecessary tail gas is entered in blowing air post by the first valve, threeway and the 4th valve.
Tool of the present invention has the following advantages:
1, increase production, one-level film carries hydrogen can obtain 85% concentration hydrogen, and synthetic ammonia output can be made to increase by 3 ~ 4%.Meanwhile, due to enter synthetic tower synthetic gas in the relative concentration of hydrogen improve, and CH
4reduce Deng other foreign gas, thus under the constant condition of tower diameter, synthesis output of column can be made to improve about 20%;
2, energy-conservation, owing to taking full advantage of the impellent of the original high-head of synthesis ammonia system as film separation unit, and do not need optional equipment power, accomplish meritorious pressure drop, the hydrogen pressure simultaneously returning synthesis system after film separation unit still reaches 2 ~ 2.5Mpa, therefore saves compression work;
3, economize on resources, hydrogen is valuable industrial chemicals, is again secondary energy.H in periodic off-gases
2if insufficient recovery, every day, with regard to large losses hydrogen resource, was both wasted, again contaminate environment, carried hydrogen and then the hydrogen recovery of 85% in synthetic ammonia periodic off-gases can be utilized, decrease the pollution to environment simultaneously by film;
4, turndown ratio is large, on the one hand by the number of units that puts into operation of system loading controlling diaphragm separating unit with the demand under satisfied different operating mode; On the other hand, occur in emergency circumstances in production, can meet that system loading significantly regulates, stably manufactured.
The present invention also has that equipment is simple, easy to operate, reliable in addition, effective utilization that can realize product energy-saving and cost-reducing while and can reduce the advantage of environmental pollution.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described, label identical in the various figures represents identical parts.For making simplified form, only schematically show and invent relevant part in each figure, they do not represent its practical structures as product.
As shown in Figure 1, the present invention includes synthesis system periodic off-gases pipeline 1, synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances, LNG production equipment 5, synthesis system periodic off-gases pipeline 1 is connected with the centre inlet of the shell side of well heater 4 with the head end membrane separation unit 11 of film separation unit by ammonia recovery unit 3, the hydrogen outlet at the top of described film separation unit is connected by pipeline and synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances, and the bottom offgas outlet of film separation unit end membrane separation unit 11 is connected with LNG production equipment 5 by pipeline.Described film separation unit comprises several membrane separation units 11 and connects, the hydrogen outlet at several membrane separation unit 11 tops is connected respectively by pipeline and synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances, shortcut pipeline 6 is provided with between the bottom offgas outlet of two adjacent membrane separation units 11, described shortcut pipeline 6 is provided with shortcut pipeline valve 7, bottom described end membrane separation unit 11, offgas outlet is provided with the first valve 8, the second valve 9 is respectively equipped with between the hydrogen outlet at several membrane separation unit tops described and synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances.Be provided with between described first valve 8 and corresponding shortcut pipeline 6 between hydrogen content thief hole 16, first valve 8 and LNG production equipment 5 and be provided with threeway, the 3rd end of threeway is connected with blowing air post 10; Be provided with the 3rd valve 14 between described threeway and LNG production equipment 5, between the 3rd end of threeway and blowing air post 10, be provided with the 4th valve 15.Stopping valve 12 is provided with between offgas outlet and rear membrane separation unit 11 import bottom described membrane separation unit 11.Described membrane separation unit 11 is five.Under meter 13 is provided with between described synthesis system periodic off-gases pipeline 1 and ammonia recovery unit 3.
In synthetic ammonia periodic off-gases, a recovery process for the retrieving arrangement of hydrogen, comprises the steps:
Step one: the periodic off-gases in synthesis system periodic off-gases pipeline 1 enters in film separation unit by the shell side of ammonia recovery unit 3 and well heater 4, the flow of under meter 13 pairs of periodic off-gases detects, the ammonia content of periodic off-gases after ammonia recovery unit 3 is less than 200PPm, and the periodic off-gases that ammonia content is less than 200PPm enters shell side post-heating to 40 ~ 50 DEG C of well heater 4;
Step 2: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 6000Nm
3during/h, closeall shortcut pipeline valve 7, open stopping valve 12, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at several membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 3: in described step 2 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, make unnecessary tail gas enter in blowing air post 10 by the first valve 8, threeway and the 4th valve 15;
Step 4: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 4500Nm
3/ h, and be less than 6000Nm
3during/h, open four membrane separation units 11 in film separation unit, the shortcut pipeline valve 7 in the membrane separation unit 11 do not opened is opened, stopping valve 12 in the membrane separation unit 11 do not opened is closed; Corresponding shortcut pipeline valve 7 in four membrane separation units 11 opened is closed, corresponding stopping valve 12 is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at four membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 5: in described step 4 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, make unnecessary tail gas enter in blowing air post 10 by the first valve 8, threeway and the 4th valve 15;
Step 6: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 3000Nm
3/ h, and be less than 4500Nm
3during/h, open three membrane separation units 11 in film separation unit, the shortcut pipeline valve 7 in the membrane separation unit 11 do not opened is opened, stopping valve 12 in the membrane separation unit 11 do not opened is closed; Corresponding shortcut pipeline valve 7 in three membrane separation units 11 opened is closed, corresponding stopping valve 12 is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at three membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 7: in described step 6 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, make unnecessary tail gas enter in blowing air post 10 by the first valve 8, threeway and the 4th valve 15;
Step 8: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 1500Nm
3/ h, and be less than 3000Nm
3during/h, open two membrane separation units 11 in film separation unit, the shortcut pipeline valve 7 in the membrane separation unit 11 do not opened is opened, stopping valve 12 in the membrane separation unit 11 do not opened is closed; Corresponding shortcut pipeline valve 7 in two membrane separation units 11 opened is closed, corresponding stopping valve 12 is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at two membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 9: in described step 6 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, unnecessary tail gas is entered in blowing air post 10 by the first valve 8, threeway and the 4th valve 15.
In order to more detailed explanation the present invention, now the present invention is further elaborated in conjunction with the embodiments.Specific embodiment is as follows:
Embodiment one
In synthetic ammonia periodic off-gases, a recovery process for the retrieving arrangement of hydrogen, comprises the steps:
Step one: the periodic off-gases in synthesis system periodic off-gases pipeline 1 enters in film separation unit by the shell side of ammonia recovery unit 3 and well heater 4, the flow of under meter 13 pairs of periodic off-gases detects, the ammonia content of periodic off-gases after ammonia recovery unit 3 is less than 200PPm, and the periodic off-gases that ammonia content is less than 200PPm enters shell side post-heating to 40 ~ 50 DEG C of well heater 4;
Step 2: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 6000Nm
3during/h, closeall shortcut pipeline valve 7, open stopping valve 12, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at several membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 3: in described step 2 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, unnecessary tail gas is entered in blowing air post 10 by the first valve 8, threeway and the 4th valve 15.
Embodiment two
In synthetic ammonia periodic off-gases, a recovery process for the retrieving arrangement of hydrogen, comprises the steps:
Step one: the periodic off-gases in synthesis system periodic off-gases pipeline 1 enters in film separation unit by the shell side of ammonia recovery unit 3 and well heater 4, the flow of under meter 13 pairs of periodic off-gases detects, the ammonia content of periodic off-gases after ammonia recovery unit 3 is less than 200PPm, and the periodic off-gases that ammonia content is less than 200PPm enters shell side post-heating to 40 ~ 50 DEG C of well heater 4;
Step 2: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 4500Nm
3/ h, and be less than 6000Nm
3during/h, open four membrane separation units 11 in film separation unit, the shortcut pipeline valve 7 in the membrane separation unit 11 do not opened is opened, stopping valve 12 in the membrane separation unit 11 do not opened is closed; Corresponding shortcut pipeline valve 7 in four membrane separation units 11 opened is closed, corresponding stopping valve 12 is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at four membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 3: in described step 2 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, unnecessary tail gas is entered in blowing air post 10 by the first valve 8, threeway and the 4th valve 15.
Embodiment three
In synthetic ammonia periodic off-gases, a recovery process for the retrieving arrangement of hydrogen, comprises the steps:
Step one: the periodic off-gases in synthesis system periodic off-gases pipeline 1 enters in film separation unit by the shell side of ammonia recovery unit 3 and well heater 4, the flow of under meter 13 pairs of periodic off-gases detects, the ammonia content of periodic off-gases after ammonia recovery unit 3 is less than 200PPm, and the periodic off-gases that ammonia content is less than 200PPm enters shell side post-heating to 40 ~ 50 DEG C of well heater 4;
Step 2: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 3000Nm
3/ h, and be less than 4500Nm
3during/h, open three membrane separation units 11 in film separation unit, the shortcut pipeline valve 7 in the membrane separation unit 11 do not opened is opened, stopping valve 12 in the membrane separation unit 11 do not opened is closed; Corresponding shortcut pipeline valve 7 in three membrane separation units 11 opened is closed, corresponding stopping valve 12 is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at three membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 3: in described step 2 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, unnecessary tail gas is entered in blowing air post 10 by the first valve 8, threeway and the 4th valve 15.
Embodiment four
In synthetic ammonia periodic off-gases, a recovery process for the retrieving arrangement of hydrogen, comprises the steps:
Step one: the periodic off-gases in synthesis system periodic off-gases pipeline 1 enters in film separation unit by the shell side of ammonia recovery unit 3 and well heater 4, the flow of under meter 13 pairs of periodic off-gases detects, the ammonia content of periodic off-gases after ammonia recovery unit 3 is less than 200PPm, and the periodic off-gases that ammonia content is less than 200PPm enters shell side post-heating to 40 ~ 50 DEG C of well heater 4;
Step 2: the flow detecting periodic off-gases when the under meter 13 described in step one is greater than 1500Nm
3/ h, and be less than 3000Nm
3during/h, open two membrane separation units 11 in film separation unit, the shortcut pipeline valve 7 in the membrane separation unit 11 do not opened is opened, stopping valve 12 in the membrane separation unit 11 do not opened is closed; Corresponding shortcut pipeline valve 7 in two membrane separation units 11 opened is closed, corresponding stopping valve 12 is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor 2 one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at two membrane separation unit tops in film separation unit, describedly enter in LNG production equipment 5 by the tail gas after film separation unit by the first valve 8, threeway and the 3rd valve 14; Described tail gas is sampled by hydrogen content thief hole 16, and the hydrogen content in tail gas is not more than 30%;
Step 3: in described step 2 during 5 full production of LNG production equipment, closes the 3rd valve 14, opens the 4th valve 15, unnecessary tail gas is entered in blowing air post 10 by the first valve 8, threeway and the 4th valve 15.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " setting ", " installation " etc. should be interpreted broadly, and such as, can be fixedly connected with, connect integratedly, also can be removably connect; Also can be the connection of two element internals; Can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.Detailed description is above only illustrating for feasibility embodiment of the present invention; they are also not used to limit the scope of the invention, and allly do not depart from equivalent implementations that skill of the present invention spirit does, change and transformation all should be included within protection scope of the present invention.
Claims (7)
1. the retrieving arrangement of hydrogen in a synthetic ammonia periodic off-gases, comprise synthesis system periodic off-gases pipeline (1), synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances, LNG production equipment (5), it is characterized in that: synthesis system periodic off-gases pipeline (1) is connected with the centre inlet of the shell side of well heater (4) with the head end membrane separation unit (11) of film separation unit by ammonia recovery unit (3), the hydrogen outlet at the top of described film separation unit is connected by pipeline and synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances, the bottom offgas outlet of film separation unit end membrane separation unit (11) is connected with LNG production equipment (5) by pipeline.
2. the retrieving arrangement of hydrogen in a kind of synthetic ammonia periodic off-gases according to claim 1, it is characterized in that: described film separation unit comprises several membrane separation units (11) series connection, the hydrogen outlet at several membrane separation units (11) top is connected respectively by pipeline and synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances, shortcut pipeline (6) is provided with between the bottom offgas outlet of two adjacent membrane separation units (11), described shortcut pipeline (6) is provided with shortcut pipeline valve (7), described end membrane separation unit (11) bottom offgas outlet is provided with the first valve (8), the second valve (9) is respectively equipped with between the hydrogen outlet at several membrane separation unit tops described and synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances.
3. the retrieving arrangement of hydrogen in a kind of synthetic ammonia periodic off-gases according to claim 2, it is characterized in that: between described first valve (8) and corresponding shortcut pipeline (6), be provided with hydrogen content thief hole (16), be provided with threeway between first valve (8) and LNG production equipment (5), the 3rd end of threeway is connected with blowing air post (10); Be provided with the 3rd valve (14) between described threeway and LNG production equipment (5), between the 3rd end of threeway and blowing air post (10), be provided with the 4th valve (15).
4. the retrieving arrangement of hydrogen in a kind of synthetic ammonia periodic off-gases according to claim 2, is characterized in that: be provided with stopping valve (12) between described membrane separation unit (11) bottom offgas outlet and a rear membrane separation unit (11) import.
5. the retrieving arrangement of hydrogen in a kind of synthetic ammonia periodic off-gases according to claim 2, is characterized in that: described membrane separation unit (11) is five.
6. the retrieving arrangement of hydrogen in a kind of synthetic ammonia periodic off-gases according to claim 1, is characterized in that: be provided with under meter (13) between described synthesis system periodic off-gases pipeline (1) and ammonia recovery unit (3).
7. the recovery process of the retrieving arrangement of hydrogen in a kind of synthetic ammonia periodic off-gases as claimed in claim 1, is characterized in that: this recovery process comprises the steps:
Step one: the periodic off-gases in synthesis system periodic off-gases pipeline (1) enters in film separation unit by the shell side of ammonia recovery unit (3) and well heater (4), under meter (13) flow to periodic off-gases detects, the ammonia content of periodic off-gases after ammonia recovery unit (3) is less than 200PPm, and the periodic off-gases that ammonia content is less than 200PPm enters shell side post-heating to 40 ~ 50 DEG C of well heater (4);
Step 2: the flow detecting periodic off-gases when the under meter (13) described in step one is greater than 6000Nm
3during/h, closeall shortcut pipeline valve (7), open stopping valve (12), the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at several membrane separation unit tops in film separation unit, describedly enter in LNG production equipment (5) by the tail gas after film separation unit by the first valve (8), threeway and the 3rd valve (14); Described tail gas is by hydrogen content thief hole (16) sampling, and the hydrogen content in tail gas is not more than 30%;
Step 3: in described step 2 during LNG production equipment (5) full production, close the 3rd valve (14), open the 4th valve (15), make unnecessary tail gas enter in blowing air post (10) by the first valve (8), threeway and the 4th valve (15);
Step 4: the flow detecting periodic off-gases when the under meter (13) described in step one is greater than 4500Nm
3/ h, and be less than 6000Nm
3during/h, open four membrane separation units (11) in film separation unit, shortcut pipeline valve (7) in the membrane separation unit (11) do not opened is opened, stopping valve (12) in the membrane separation unit (11) do not opened is closed; Shortcut pipeline valve (7) corresponding in four membrane separation units (11) of opening is closed, corresponding stopping valve (12) is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at four membrane separation unit tops in film separation unit, describedly enter in LNG production equipment (5) by the tail gas after film separation unit by the first valve (8), threeway and the 3rd valve (14); Described tail gas is by hydrogen content thief hole (16) sampling, and the hydrogen content in tail gas is not more than 30%;
Step 5: in described step 4 during LNG production equipment (5) full production, close the 3rd valve (14), open the 4th valve (15), make unnecessary tail gas enter in blowing air post (10) by the first valve (8), threeway and the 4th valve (15);
Step 6: the flow detecting periodic off-gases when the under meter (13) described in step one is greater than 3000Nm
3/ h, and be less than 4500Nm
3during/h, open three membrane separation units (11) in film separation unit, shortcut pipeline valve (7) in the membrane separation unit (11) do not opened is opened, stopping valve (12) in the membrane separation unit (11) do not opened is closed; Shortcut pipeline valve (7) corresponding in three membrane separation units (11) of opening is closed, corresponding stopping valve (12) is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at three membrane separation unit tops in film separation unit, describedly enter in LNG production equipment (5) by the tail gas after film separation unit by the first valve (8), threeway and the 3rd valve (14); Described tail gas is by hydrogen content thief hole (16) sampling, and the hydrogen content in tail gas is not more than 30%;
Step 7: in described step 6 during LNG production equipment (5) full production, close the 3rd valve (14), open the 4th valve (15), make unnecessary tail gas enter in blowing air post (10) by the first valve (8), threeway and the 4th valve (15);
Step 8: the flow detecting periodic off-gases when the under meter (13) described in step one is greater than 1500Nm
3/ h, and be less than 3000Nm
3during/h, open two membrane separation units (11) in film separation unit, shortcut pipeline valve (7) in the membrane separation unit (11) do not opened is opened, stopping valve (12) in the membrane separation unit (11) do not opened is closed; Shortcut pipeline valve (7) corresponding in two membrane separation units (11) of opening is closed, corresponding stopping valve (12) is opened, the periodic off-gases after heating is made to pass through film separation unit, enter in synthesis system elevated pressure nitrogen hydrogen compressor (2) one sections of entrances by the hydrogen after film separation unit by the hydrogen outlet at two membrane separation unit tops in film separation unit, describedly enter in LNG production equipment (5) by the tail gas after film separation unit by the first valve (8), threeway and the 3rd valve (14); Described tail gas is by hydrogen content thief hole (16) sampling, and the hydrogen content in tail gas is not more than 30%;
Step 9: in described step 6 during LNG production equipment (5) full production, close the 3rd valve (14), open the 4th valve (15), unnecessary tail gas is entered in blowing air post (10) by the first valve (8), threeway and the 4th valve (15).
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