CN104910952B - Catalytic cracking apparatus stable absorption unit and desulfurization unit shutdown sealed relaying purging process - Google Patents
Catalytic cracking apparatus stable absorption unit and desulfurization unit shutdown sealed relaying purging process Download PDFInfo
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- CN104910952B CN104910952B CN201510278776.4A CN201510278776A CN104910952B CN 104910952 B CN104910952 B CN 104910952B CN 201510278776 A CN201510278776 A CN 201510278776A CN 104910952 B CN104910952 B CN 104910952B
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Abstract
The present invention provides a catalytic cracking apparatus stable absorption unit and desulfurization unit shutdown sealed relaying purging process. According to the present invention, during the catalytic cracking apparatus shutdown process, the sealed relaying purging technology of various towers in the stable absorption unit and the desulfurization unit is performed, the stable absorption unit purging steam is purged to the desulfurization unit, and through various tower top safety valve sub-pipelines of the desulfurization unit, the steam purging oil gas is conveyed to the low pressure flare pipeline inside the apparatus and is transferred into a fractionation tower, is cooled through a fractionation tower top cooling system, and is separated in an oil-gas separator in front of a gas compressor. According to the present invention, the low pressure flare pipeline to the outside of the apparatus is added to the oil-gas separator to discharge the non-condensing gas to the gas cabinet outside the apparatus and recover, such that the sealed relaying purging of the stable absorption unit and the desulfurization unit of the cracking apparatus is achieved through the simple process change in the case of no increase of the additional cooling equipment investment so as to achieve the environmental protection shutdown purpose.
Description
Technical field
During the present invention relates to a kind of catalytic cracking unit, stable absorption unit and desulfurization unit shut-down, the airtight relay blowing of each tower
Sweep technique.
Background technology
Heavy oil catalytically cracking equipment, uses MIP-CGP technique, and designed capacity is 800,000 tons/year.Catalytic cracking unit is over the years
Maintenance stop work during, each column overhead of absorption tower, Analytic Tower, reabsorber and desulfurization unit in stable absorption unit is without cold
But system, causes each tower of shut-down process to purge steam and cannot condense, and steam blowing oil gas must not enter low pressure and put flare system,
Cause shut-down steam blowing, it is necessary to open tower top emptying discharge.Cause environmental pollution, and oil and gas loss.Nowadays, due to enterprise
The increase of environmental protection pressure, this kind of unrest arrange, the shut-down mode that leaves about can not meet current requirement.This just requires must propose newly
Processing scheme, stop work during, reach the requirement of the environmental protection of airtight shut-down.
Summary of the invention
For existing catalytic cracking unit during stopping work, each tower purges steam and cannot condense, it is necessary to opens tower top discharge, makes
Become environmental pollution and the problem of oil and gas loss, during the invention provides a kind of catalytic cracking unit shut-down, the airtight relay of each tower
The technique of purging, it is achieved the environmental protection of catalytic cracking unit is stopped work, and the recovery of oil gas.
The present invention uses following technical scheme:
Catalytic cracking unit stable absorption, the desulfurization unit airtight relay purging process of shut-down, including
Step 1: stable absorption unit, desulfurization unit are removed pressure and terminated, catalytic cracking unit stops work, Analytic Tower, absorption tower, again
The tower top of absorption tower, dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, amine liquid regenerator and fractionating column is airtight；
Step 2: open aerostatic press rich gas valve, to steam at the bottom of Analytic Tower tower, condensing oil tank carries aerostatic press to steam, steam
Gas in rich gas, Analytic Tower, through condensing oil tank, subsequently into absorption tower, the sour water formed in condensing oil tank, passes through
The outlet of condensed oil pot bottom enters sewage disposal system；
Step 3: when absorption tower column bottom temperature is more than 100 DEG C, opens and be passed through steam at the bottom of absorbing tower, carry out steam relay purging,
Steam is caught up with into reabsorber；
Step 4: when reabsorber column bottom temperature is more than 100 DEG C, opens and be passed through steam at the bottom of reabsorber tower, carry out steam relay
Purging, catches up with steam into dry gas desulfurizing tower；
Step 5: when dry gas desulfurizing tower column bottom temperature is more than 100 DEG C, Kai Tadi is passed through steam, carries out steam relay purging, logical
Overdrying desulfurization column overhead relief valve by-pass, catches up with steam and sets fire torch pipe net into low pressure gas, and low pressure gas torch pipe net of setting fire is intrinsic pressure
Power sets and is not more than 0.15MPa；
Step 6: liquefied gas tank desulfurizing tower first carries out water top, after water top is terminated, enters steam blowing stage, liquefied gas tank desulfurizing tower tower
The end, to steam, carries out steam blowing, and steam enters low pressure gas by tower top relief valve by-pass and sets fire torch pipe net；
Step 7: pressure removed by amine liquid regenerator oxytropism gas torch pipe net of setting fire, and is passed through steam at the bottom of amine liquid tower tower, and steam is by tower inner acidic
Gas catches up with sour gas to set fire after torch pipe net, closes amine liquid regenerator and enters sour gas and set fire the hands valve of torch pipe net；Open tower top safety
Valve by-pass, enters fractionating column by amine liquid Ta Tanei steam blowing；
Step 8: after gas air-blowing has been swept in dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, closes low pressure gas and sets fire torch pipe net
Valve, opens fractionator overhead relief valve by-pass valve, purging in dry gas desulfurizing tower, liquefied gas tank desulfurizing tower and amine liquid regenerator
Steam enters fractionating column；
Step 9: steam in fractionating column, after being fractionated into column overhead air cooler and aftercooler cooling, enters the oil gas before aerostatic press and divides
In device；
Step 10: do not coagulate device in Gas in the gs-oil separator before aerostatic press, increase setting fire outside device newly through gs-oil separator top
Torch line is delivered to torch Holder System and is reclaimed；In gs-oil separator, cold oil aqueous mixtures is pumped up to sewage disposal system；
Step 11: by Analytic Tower, absorption tower, reabsorber, dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, amine liquid regenerator and point
Evaporate condensation sewage at the bottom of the tower of tower, and the condensation sewage that low pressure gas is set fire in torch pipe net delivers to sewage disposal system.
The present invention has a following beneficial effect:
Catalytic cracking unit, in the downtime, is implemented in stable absorption unit, desulfurization unit after each tower airtight relay purging technology,
Fully meet the requirement that environmental protection is stopped work, and the most extra increase cooling device, save cost, really real in the downtime
Show pipeline purging, the target of steaming tower purging " zero-emission ", effectively prevent shut-down process, pollution on the environment.?
Before aerostatic press, gs-oil separator increases by one to the torch flow process of setting fire outside device, it is achieved the recovery of shut-down oil gas, it is to avoid shut-down product
Loss, reduces shut-down loss.Each tower steam relay purges, Analytic Tower give steam points, condensing oil tank, absorption as main
Tower, reabsorber, dry gas desulfurizing tower only need a small amount of to steam, and a large amount of saving purges steam, and improves steam utilization rate, subtracts
Little waste.
Accompanying drawing explanation
Fig. 1 is that stable absorption unit of the present invention purges flow chart to desulfurization unit steam relay.
Fig. 2 is that inventive desulfurization unit purges flow chart to fractionating column steam relay.
Detailed description of the invention
The present invention will be described in detail below in conjunction with the accompanying drawings:
Catalytic cracking unit stable absorption, the desulfurization unit airtight relay purging process of shut-down, including
Step 1: stable absorption unit, desulfurization unit are removed pressure and terminated, catalytic cracking unit stops work, Analytic Tower, absorption tower, again
The tower top of absorption tower, dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, amine liquid regenerator and fractionating column is airtight；
Step 2: open aerostatic press rich gas valve, to steam at the bottom of Analytic Tower tower, condensing oil tank carries aerostatic press to steam, steam
Gas in rich gas, Analytic Tower, through condensing oil tank, subsequently into absorption tower, the sour water formed in condensing oil tank, passes through
The outlet of condensed oil pot bottom enters sewage disposal system；
Step 3: when absorption tower column bottom temperature is more than 100 DEG C, opens and be passed through steam at the bottom of absorbing tower, carry out steam relay purging,
Steam is caught up with into reabsorber；
Step 4: when reabsorber column bottom temperature is more than 100 DEG C, opens and be passed through steam at the bottom of reabsorber tower, carry out steam relay
Purging, catches up with steam into dry gas desulfurizing tower；
Step 5: when dry gas desulfurizing tower column bottom temperature is more than 100 DEG C, Kai Tadi is passed through steam, carries out steam relay purging, logical
Overdrying desulfurization column overhead relief valve by-pass, catches up with steam and sets fire torch pipe net into low pressure gas, and low pressure gas torch pipe net of setting fire is intrinsic pressure
Power sets and is not more than 0.15MPa；
Step 6: liquefied gas tank desulfurizing tower first carries out water top, after water top is terminated, enters steam blowing stage, liquefied gas tank desulfurizing tower tower
The end, to steam, carries out steam blowing, and steam enters low pressure gas by tower top relief valve by-pass and sets fire torch pipe net；
Step 7: pressure removed by amine liquid regenerator oxytropism gas torch pipe net of setting fire, and is passed through steam at the bottom of amine liquid tower tower, and steam is by tower inner acidic
Gas catches up with sour gas to set fire after torch pipe net, closes amine liquid regenerator and enters sour gas and set fire the hands valve of torch pipe net；Open tower top safety
Valve by-pass, enters fractionating column by amine liquid Ta Tanei steam blowing；
Step 8: after gas air-blowing has been swept in dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, closes low pressure gas and sets fire torch pipe net
Valve, opens fractionator overhead relief valve by-pass valve, purging in dry gas desulfurizing tower, liquefied gas tank desulfurizing tower and amine liquid regenerator
Steam enters fractionating column；
Step 9: steam in fractionating column, after being fractionated into column overhead air cooler and aftercooler cooling, enters the oil gas before aerostatic press and divides
In device；
Step 10: do not coagulate device in Gas in the gs-oil separator before aerostatic press, increase setting fire outside device newly through gs-oil separator top
Torch line is delivered to torch Holder System and is reclaimed；In gs-oil separator, cold oil aqueous mixtures is pumped up to sewage disposal system；
Step 11: by Analytic Tower, absorption tower, reabsorber, dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, amine liquid regenerator and point
Evaporate condensation sewage at the bottom of the tower of tower, and the condensation sewage that low pressure gas is set fire in torch pipe net delivers to sewage disposal system.
During catalytic cracking unit stable absorption unit of the present invention and desulfurization unit are stopped work, use each tower relay purging process,
In the case of not increasing the investment of extra cooling device, change by quick-reading flow sheets is dynamic, it is achieved catalytic unit stablizes unit and desulfurization unit
Airtight relay purging, reach environmental protection stop work purpose.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, the art
Change that technical staff is made in the essential scope of the present invention, retrofit, add or replace, also should belong to the protection of the present invention
Scope.
Claims (1)
1. catalytic cracking unit stable absorption, the desulfurization unit airtight relay purging process of shut-down, it is characterised in that: include
Step 1: stable absorption unit, desulfurization unit are removed pressure and terminated, catalytic cracking unit stops work, Analytic Tower, absorption tower, again
The tower top of absorption tower, dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, amine liquid regenerator and fractionating column is airtight；
Step 2: open aerostatic press rich gas valve, to steam at the bottom of Analytic Tower tower, condensing oil tank carries aerostatic press to steam, steam
Gas in rich gas, Analytic Tower, through condensing oil tank, subsequently into absorption tower, the sour water formed in condensing oil tank, passes through
The outlet of condensed oil pot bottom enters sewage disposal system；
Step 3: when absorption tower column bottom temperature is more than 100 DEG C, opens and be passed through steam at the bottom of absorbing tower, carry out steam relay purging,
Steam is caught up with into reabsorber；
Step 4: when reabsorber column bottom temperature is more than 100 DEG C, opens and be passed through steam at the bottom of reabsorber tower, carry out steam relay
Purging, catches up with steam into dry gas desulfurizing tower；
Step 5: when dry gas desulfurizing tower column bottom temperature is more than 100 DEG C, Kai Tadi is passed through steam, carries out steam relay purging, logical
Overdrying desulfurization column overhead relief valve by-pass, catches up with steam and sets fire torch pipe net into low pressure gas, and low pressure gas torch pipe net of setting fire is intrinsic pressure
Power sets and is not more than 0.15MPa；
Step 6: liquefied gas tank desulfurizing tower first carries out water top, after water top is terminated, enters steam blowing stage, liquefied gas tank desulfurizing tower tower
The end, to steam, carries out steam blowing, and steam enters low pressure gas by tower top relief valve by-pass and sets fire torch pipe net；
Step 7: pressure removed by amine liquid regenerator oxytropism gas torch pipe net of setting fire, and is passed through steam at the bottom of amine liquid tower tower, and steam is by tower inner acidic
Gas catches up with sour gas to set fire after torch pipe net, closes amine liquid regenerator and enters sour gas and set fire the hands valve of torch pipe net；Open tower top safety
Valve by-pass, enters fractionating column by amine liquid Ta Tanei steam blowing；
Step 8: after gas air-blowing has been swept in dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, closes low pressure gas and sets fire torch pipe net
Valve, opens fractionator overhead relief valve by-pass valve, purging in dry gas desulfurizing tower, liquefied gas tank desulfurizing tower and amine liquid regenerator
Steam enters fractionating column；
Step 9: steam in fractionating column, after being fractionated into column overhead air cooler and aftercooler cooling, enters the oil gas before aerostatic press and divides
In device；
Step 10: do not coagulate device in Gas in the gs-oil separator before aerostatic press, increase setting fire outside device newly through gs-oil separator top
Torch line is delivered to torch Holder System and is reclaimed；In gs-oil separator, cold oil aqueous mixtures is pumped up to sewage disposal system；
Step 11: by Analytic Tower, absorption tower, reabsorber, dry gas desulfurizing tower, liquefied gas tank desulfurizing tower, amine liquid regenerator and point
Evaporate condensation sewage at the bottom of the tower of tower, and the condensation sewage that low pressure gas is set fire in torch pipe net delivers to sewage disposal system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510278776.4A CN104910952B (en) | 2015-05-27 | 2015-05-27 | Catalytic cracking apparatus stable absorption unit and desulfurization unit shutdown sealed relaying purging process |
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| CN201510278776.4A CN104910952B (en) | 2015-05-27 | 2015-05-27 | Catalytic cracking apparatus stable absorption unit and desulfurization unit shutdown sealed relaying purging process |
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| CN104910952A CN104910952A (en) | 2015-09-16 |
| CN104910952B true CN104910952B (en) | 2017-01-11 |
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| CN106554000B (en) * | 2015-09-30 | 2018-07-06 | 中国石油化工股份有限公司 | Sulphur unit green shut-down method |
| CN112410056A (en) * | 2019-08-20 | 2021-02-26 | 中国石油天然气股份有限公司 | Purging system of catalytic cracking unit |
| CN113476878A (en) * | 2021-07-09 | 2021-10-08 | 山东金诚重油化工技术研究院 | Method for combined removal of trace nitrogen |
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| JPS57179281A (en) * | 1981-04-28 | 1982-11-04 | Tokyo Gas Co Ltd | Decoking apparatus in heavy oil cracking gas apparatus |
| CN202440471U (en) * | 2011-12-27 | 2012-09-19 | 中国寰球工程公司 | Oil gas recovery system |
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Address after: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Applicant after: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. Applicant after: Sinopec Corp. Address before: 100728 Chaoyangmen street, Beijing, No. 22, No. Applicant before: Sinopec Corp. Applicant before: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. |
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