CN104697290B - The recovery system and application method of the unnecessary nitrogen of fractionating column in oxygen generating plant - Google Patents
The recovery system and application method of the unnecessary nitrogen of fractionating column in oxygen generating plant Download PDFInfo
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- CN104697290B CN104697290B CN201510051686.1A CN201510051686A CN104697290B CN 104697290 B CN104697290 B CN 104697290B CN 201510051686 A CN201510051686 A CN 201510051686A CN 104697290 B CN104697290 B CN 104697290B
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Abstract
The present invention relates to Air separation industry, it is especially the recovery system and application method of the unnecessary nitrogen of fractionating column in a kind of oxygen generating plant, i.e., using in oxygen generating plant, the unnecessary nitrogen of fractionating column is vented, during as pressure vessel periodic inspection, the use of intensity and leak test medium.During pressure vessel periodic inspection in the prior art, Inspection Unit is filled with nitrogen using outsourcing nitrogen cylinder to pressure vessel, reaches its intensity and leak test pressure, considerable amount.For oxygen generating plant in addition to oxygen is produced, nitrogen is also produced, its quality better is dry, pure, in the unit without nitrogen, mostly all emptying.The present invention is according to the characteristics of oxygen generating plant itself, nitrogen blow-down pipe is transformed, local flow improvement is carried out to pipeline using original oxygen compressor, make it possible to compressed nitrogen, test(ing) medium during as Inspection of Pressure Vessel was not only safe but also economical, and each interface of pipeline has Valve controlling, can retain, treat that next periodic test is continuing with, put things right once and for all.
Description
Technical field
It is especially the recovery system of the unnecessary nitrogen of fractionating column and to make in a kind of oxygen generating plant the present invention relates to Air separation industry
With method, i.e., using in oxygen generating plant, the unnecessary nitrogen emptying of fractionating column, during as pressure vessel periodic inspection, intensity and tight
The application method of tightness test medium.
Background technology
For pressure vessel as important special equipment, can be related to enterprise's production realize safe and stable, long period, excellent
Matter is run, to ensure the institutionalization of pressure vessel management work, standardization, effectively preventing or reduce accident, oxygen station
Pressure pipeline and pressure vessel are according to country《Safe technology of pressure vessel Supervision Code》Regulation, periodically carry out pressure vessel
Inside and outside portion examines, and must carry out intensity and leak test afterwards, the medium of use should be air or nitrogen, and Inspection Unit is big
All from nitrogen as test(ing) medium, it is necessary to which outsourcing nitrogen cylinder is filled with nitrogen to pressure vessel, and the reserves of nitrogen cylinder are limited, and one
Bottle nitrogen is calculated by 15MPa, the most 6m of volume3, and the reserves under nitrogen cylinder normal temperature only have 4.8m3, and it is less than the container to be tested
Pressure, gas cylinder can not export nitrogen again, the gas effciency in such nitrogen cylinder at most only 80%, such as examine two 100m3
Oxygen container at least needs 1400 bottles of nitrogen, examines two 30m3Oxygen container at least needs 400 bottles of nitrogen, the price of outsourcing nitrogen cylinder
Plus incidentals such as transports, need the quantity of nitrogen cylinder, price considerable after examining every time, can be only achieved its intensity and tightness examination
Test the requirement of pressure.For oxygen station equipment in addition to oxygen is produced, nitrogen is also produced, its quality is very good, dry, pure,
Without the unit of nitrogen, all emptying, this part nitrogen is used, as the test(ing) medium after Inspection of Pressure Vessel mostly
Not only it is safe but also economical.
The content of the invention
The purpose of the present invention is to utilize the recovery system and application method of the unnecessary nitrogen of fractionating column in oxygen generating plant, to substitute
Outsourcing nitrogen cylinder is filled with nitrogen as test(ing) medium to pressure vessel.
The technical solution adopted for the present invention to solve the technical problems is：
The recovery system of the unnecessary nitrogen of fractionating column in a kind of oxygen generating plant, it is characterized in that：Using in oxygen generating plant, fractionating column
Unnecessary nitrogen emptying, during as pressure vessel periodic inspection, the structure of modification of intensity and leak test medium；
Its system architecture is made up of four parts, and Part I bypasses connection one from the nitrogen blow-down pipe of original fractionating column
Pipe ball adding valve controls nitrogen flow, and nitrogen pipeline is connected to oxygen compressor room always, and the original nitrogen regeneration replenishment valve of equipment continues
Use, original nitrogen atmospheric valve used time can close, and original fractionating column oxygen air outlet valve enters oxygen main, and original oxygen enters
Enter the closing of oxygen compressor intake valve；
Part II is connected to nitrogen tube before the original bypass air inlet pipe of oxygen compressor again plus an oxygen compressor enters nitrogen ball valve
Control the flow into oxygen compressor nitrogen, add one enter oxygen compressor piping filter removing nitrogen pipeline system contaminants, pass through pipeline again
Original filter enters oxygen compressor, closes original oxygen to bottle valve is filled, and opens original oxygen emptying valve, utilizes oxygen emptying
Pipe is as nitrogen outlet；
Part III leads to the connection threeway of air blow-down pipe bottom in oxygen, installs control piper gas emptying ball valve additional and enters
The ball valve of the total nitrogen flow of the management and control system of becoming owner of, each branch pipe is connected with pipeline connecting flange afterwards, respectively plus pipe-support is allowed to flat
It is firm fixed；
Part IV is from each branch pipe plus four controls enter oxygen tank body nitrogen flow ball valve, passes through the row of tank body in itself
Empty valve, oxygen tank body is respectively enterd, control enters each road test chamber nitrogen flow, then installs the nitrogen emptying after four experiments additional
And replacement of oxygen ball valve, used as the nitrogen emptying after experiment and replacement of oxygen valve, intensity and tightness are completed after practice
Experiment work, meet code requirement, obtain quality testing department accreditation.
The application method of the recovery system of the unnecessary nitrogen of fractionating column is in oxygen generating plant：
Air separation plant can be produced normally, specific steps：
1) the nitrogen pipeline purging after, installing：
Exhaust-valve, the original oxygen of closing of the emptying of closing control pipeline gas ball valve and each pressure vessel bottom tank body in itself
Gas closes the original nitrogen atmospheric valve of fractionating column to bottle valve is filled, and closes original oxygen and enters oxygen compressor intake valve, opens following
Valve：Ball valve, enter nitrogen ball valve, original oxygen emptying valve into oxygen compressor, and total nitrogen flow is controlled towards pressure vessel supervisor
Ball valve, four controls enter oxygen tank body nitrogen flow ball valve in each branch pipe, nitrogen emptying and replacement of oxygen ball after experiment
Valve, oxygen compressor is opened afterwards, logical nitrogen is purged, until pipeline gas cleans, free from admixture, untill target version test passes.
2), pressure vessel test
The exhaust-valve of the pressure container tank body to be suppressed in itself, original oxygen emptying valve, ball valve, oxygen compressor enter nitrogen
Ball valve, supervisor control four controls in the ball valve of total nitrogen flow, branch pipe to enter oxygen tank body nitrogen flow ball valve, close original
Nitrogen atmospheric valve, original oxygen to fill bottle valve, control piper gas emptying ball valve, experiment after nitrogen emptying and replacement of oxygen
Ball valve, oxygen compressor is opened afterwards and leads to nitrogen progress pressure vessel test, until completing authorized pressure.
3), pressure release is replaced
Reach test pressure and pressurize on request, after obtaining quality testing department accreditation, completion experiment work, stopping oxygen compressor,
Shutoff valve 6,7,15,18a, 18b, 18c, 18d, open original nitrogen atmospheric valve and valve 14,19a, 19b, 19c, 19d, 20a,
20b, 20c, 20d, the nitrogen in oxygen tank body is emptied, is carried out by normal procedure.
The invention has the advantages that：
1st, using the recovery system and application method of the unnecessary nitrogen of fractionating column in oxygen generating plant, to substitute traditional outsourcing nitrogen
Bottle is filled with the test method of nitrogen to pressure vessel, reduces substantial amounts of fund and wastes, economic benefit and social benefit are notable.
2nd, this item is reasonable in design, small investment, can recycle, and puts things right once and for all.
Brief description of the drawings
Fig. 1：The recovery system of the unnecessary nitrogen of fractionating column and the design diagram of application method in the oxygen generating plant of the present invention.
In figure：1st, fractionating column, 2, the original nitrogen regeneration replenishment valve of equipment, 3, original nitrogen atmospheric valve, 4, original fractionating column
Oxygen air outlet valve, 5, original oxygen enter oxygen compressor intake valve, 6, ball valve, 7, oxygen compressor enter nitrogen ball valve, 8, enter oxygen compressor pipe
Road filter, 9, the original filter of pipeline, 10, oxygen compressor, 11, original oxygen to filling bottle valve, 12, original oxygen emptying
Valve, 13, connection threeway, 14, control piper gas emptying ball valve, 15, supervisor control the ball valve of total nitrogen flow, 16a, 16b pipe
Road adpting flange, 17a, 17b, 17c, 17d pipe-support, 18a, 18b, 18c, 18d control enter oxygen tank body nitrogen flow ball
Valve, nitrogen emptying and replacement of oxygen ball valve after 19a, 19b, 19c, 19d experiment, the row of 20a, 20b, 20c, 20d tank body in itself
Empty valve, 21a, 21b, 21c, 21d oxygen tank body.
Embodiment
The present invention is according to the characteristics of oxygen generating plant itself, and nitrogen blow-down pipe is transformed, utilizes original oxygen compressor
Local flow improvement is carried out to pipeline, makes it possible to compressed nitrogen, test(ing) medium during as Inspection of Pressure Vessel, not only safety warp again
Ji.
The recovery system and application method of the unnecessary nitrogen of fractionating column in described oxygen generating plant, its system architecture is by four parts
Composition, Part I bypass connection one branch pipe ball adding valve 6 control nitrogen flow, nitrogen from the nitrogen blow-down pipe of original fractionating column 1
Pipeline is connected to oxygen compressor room always, and the original nitrogen regeneration replenishment valve 2 of equipment is continuing with, original used time of nitrogen atmospheric valve 3
It can close, original fractionating column oxygen air outlet valve 4 enters oxygen main, and original oxygen is closed into oxygen compressor intake valve 5, (empty
Branch trade typically has more oxygen compressors, uses a wherein can).Nitrogen tube is connected to oxygen compressor original by Part II
Have before bypass air inlet pipe again plus a ball valve 7 controls the flow into oxygen compressor nitrogen plus one enters oxygen compressor piping filter 8 and remove
Nitrogen pipeline system contaminants, oxygen compressor 10 is entered by the original filter 9 of pipeline again, close original oxygen to filling bottle valve
11, original oxygen emptying valve 12 is opened, is vented by the use of oxygen emptying pipe as nitrogen outlet, Part III in oxygen towards air
Pipe bottom connects threeway 13, installs control piper gas emptying ball valve 14 additional and enters the ball valve 15 that supervisor controls total nitrogen flow,
Each branch pipe is connected with pipeline connecting flange 16a, 16b afterwards, respectively plus pipe-support 17a, 17b, 17c, 17d are allowed to steady solid
Fixed, Part IV is from each branch pipe plus four controls enter oxygen tank body nitrogen flow ball valve 18a, 18b, 18c, 18d, passes through tank
Exhaust-valve 20a, 20b, 20c, the 20d of body in itself, respectively enter oxygen tank body 21a, 21b, 21c, 21d, and control enters each road test
Container nitrogen flow is tested, then installs nitrogen emptying and replacement of oxygen ball valve 19a, 19b, 19c, 19d after four experiments additional, as examination
Nitrogen emptying and replacement of oxygen valve after testing are used, and intensity and leak test work are completed after practice, meets code requirement,
Obtain quality testing department accreditation.
Specific design：As shown in Figure 1, using the nitrogen blow-down pipe of fractionating column, the perforate welding bypass one in its pipeline
Galvanized pipe diameter of phi 89 × 4, effect prevent there are the impurity such as rust in pipeline, into oxygen compressor, cause unsafe factor, make its pipeline
High-altitude is inserted into oxygen compressor room side wall, and it is buried that lower edge walks underground, is plated to the original bypass air inlet pipe connection diameter Φ 89 × 4 of oxygen compressor
Zinc pipe, ball adding valve, piping filter composition Part I, after nitrogen enters oxygen compressor, is used through blow-down pipe bottom outside oxygen compressor room
Φ 25 × 3 seamless steel pipe composition Part II, Part III come into oxygen tank field, open flames prohibited, so all pipelines
Connection is all using prefabricated outside factory, the mode of live flange connection, guarantee safety.Part IV utilizes the row of pressure vessel itself
Blank pipe road and valve, Φ 25 × 3 seamless steel pipe is connected, install the control of twice ball valve additional, all pipelines are connected all using ball
Valve controls, the good airproof performance of purpose gas, reduces leakage, guarantee test quality.
The core that the present invention designs is：On the premise of ensureing to use safely, twice laid, fund is saved.
Job step：Air separation plant can be produced normally
1st, the nitrogen pipeline purging after installing：
Exhaust-valve 20a, 20b, 20c, 20d, the original oxygen of closing of shutoff valve 14 and each pressure vessel bottom tank body in itself
To bottle valve 11 is filled, the original nitrogen atmospheric valve 3 of fractionating column is closed, original oxygen is closed and enters oxygen compressor intake valve 5, is opened following
Each valve：Ball valve 6, into the intake valve 7 of oxygen compressor, oxygen emptying valve 12, and total nitrogen flow is controlled towards pressure vessel supervisor
Ball valve 15, four controls enter oxygen tank body nitrogen flow ball valve 18a, 18b, 18c, 18d, the nitrogen after experiment in each branch pipe
Emptying and replacement of oxygen ball valve 19a, 19b, 19c, 19d, open oxygen compressor 10 afterwards, and logical nitrogen is purged, until pipeline gas
Cleaning, free from admixture, untill target version test passes.
2nd, pressure vessel test
Exhaust-valve 20a, 20b, 20c, the 20d of the pressure container tank body to be suppressed in itself, original oxygen emptying valve 12,
Four controls enter oxygen tank body nitrogen flow ball valve 18a, 18b, 18c, 18d in valve 6,7,15, branch pipe, close original nitrogen and put
Empty valve 3, original oxygen to fill bottle valve 11, control piper gas emptying ball valve 14, experiment after nitrogen emptying and replacement of oxygen
Ball valve 19a, 19b, 19c, 19d, oxygen compressor 10 is opened afterwards and leads to nitrogen progress pressure vessel test, (is pressed until completing authorized pressure
Testing regulations performs).
3rd, pressure release is replaced
Reach test pressure and pressurize on request, after obtaining quality testing department accreditation, complete experiment work, stop oxygen compressor
10th, shutoff valve 6,7,15,18a, 18b, 18c, 18d, open original nitrogen atmospheric valve 3 and valve 14,19a, 19b, 19c, 19d,
20a, 20b, 20c, 20d, the nitrogen in oxygen tank body 21a, 21b, 21c, 21d is emptied, is carried out by normal procedure.
It is that unique, of the invention pipeline connection can also have other embodiment that above-mentioned embodiment, which is not, but
It all should fall within the scope of protection of the present invention.
Claims (2)
1. a kind of recovery system using the unnecessary nitrogen of fractionating column in oxygen generating plant, it is characterized in that：Using in oxygen generating plant, it is fractionated
The unnecessary nitrogen emptying of tower, during as pressure vessel periodic inspection, the structure of modification of intensity and leak test medium；
The recovery system of the unnecessary nitrogen of fractionating column, its system architecture are made up of four parts in described oxygen generating plant, Part I
From the nitrogen blow-down pipe of original fractionating column (1), bypass connection one branch pipe ball adding valve (6) control nitrogen flow, nitrogen pipeline is always
Oxygen compressor room is connected to, original nitrogen regeneration replenishment valve (2) is continuing with, and original nitrogen atmospheric valve (3) used time can close, former
Some fractionating column oxygen air outlet valves (4) enter oxygen main, and original oxygen is closed into oxygen compressor intake valve (5)；
Part II adds an oxygen compressor to enter nitrogen ball valve (7) control again before nitrogen tube is connected into the original bypass air inlet pipe of oxygen compressor
Make the flow into oxygen compressor nitrogen, add one enter oxygen compressor piping filter (8) removing nitrogen pipeline system contaminants, pass through pipeline again
Original filter (9) enters oxygen compressor (10), closes original oxygen to bottle valve (11) is filled, opens original oxygen emptying valve
(12), it is used as nitrogen outlet by the use of oxygen emptying pipe；
Part III leads to air blow-down pipe bottom connection threeway (13) in oxygen, installs control piper gas emptying ball valve (14) additional
With the ball valve (15) for entering the total nitrogen flow of supervisor's control, each branch pipe is connected with pipeline connecting flange (16a, 16b) afterwards, respectively
Pipe-support (17a, 17b, 17c, 17d) is added to be allowed to steady fixation；
Part IV is from each branch pipe plus four controls enter oxygen tank body nitrogen flow ball valve (18a, 18b, 18c, 18d), leads to
Cross the exhaust-valve (20a, 20b, 20c, 20d) of tank body in itself, respectively enter oxygen tank body (21a, 21b, 21c, 21d), control into
Ru Ge roads test chamber nitrogen flow, then install additional four experiment after nitrogen emptying and replacement of oxygen ball valve (19a, 19b, 19c,
19d), used as the nitrogen emptying after experiment and replacement of oxygen valve, intensity and leak test work, symbol are completed after practice
Code requirement is closed, obtains quality testing department accreditation.
2. the application method of the recovery system of the unnecessary nitrogen of fractionating column in a kind of oxygen generating plant as claimed in claim 1, it is special
Sign is：
Air separation plant can be produced normally, specific steps：
1) the nitrogen pipeline purging after, installing：
Closing control pipeline gas emptying ball valve (14) and each pressure vessel bottom tank body in itself exhaust-valve (20a, 20b,
20c, 20d), close original oxygen to bottle valve (11) is filled, close the original nitrogen atmospheric valve (3) of fractionating column, close original oxygen
Into oxygen compressor intake valve (5), following valve is opened：Ball valve (6), enter nitrogen ball valve (7), oxygen emptying valve into oxygen compressor
(12), and towards pressure vessel supervisor four controls in the ball valve (15) of total nitrogen flow, each branch pipe are controlled to enter oxygen tank body
Nitrogen flow ball valve (18a, 18b, 18c, 18d), after experiment nitrogen emptying and replacement of oxygen ball valve (19a, 19b, 19c,
19d), oxygen compressor (10) is opened afterwards, and logical nitrogen is purged, until pipeline gas cleans, free from admixture, is with target version test passes
Only；
2), pressure vessel test
The exhaust-valve (20a, 20b, 20c, 20d) of the pressure container tank body to be suppressed in itself, original oxygen emptying valve (12),
Ball valve (6), oxygen compressor enter nitrogen ball valve (7), supervisor controls four controls in the ball valve (15) of total nitrogen flow, branch pipe to enter oxygen
Gas tank body nitrogen flow ball valve (18a, 18b, 18c, 18d), original nitrogen atmospheric valve (3), original oxygen are closed to filling bottle valve
(11), control piper gas emptying ball valve (14), experiment after nitrogen emptying and replacement of oxygen ball valve (19a, 19b, 19c,
19d), oxygen compressor (10) is opened afterwards and leads to nitrogen progress pressure vessel test, until completing authorized pressure；
3), pressure release is replaced
Reach test pressure and pressurize on request, after obtaining quality testing department accreditation, completion experiment work, stopping oxygen compressor (10),
Close ball valve (6), oxygen compressor enters nitrogen ball valve (7), supervisor controls the ball valve (15) of total nitrogen flow, control to enter oxygen tank body
Nitrogen flow ball valve (18a, 18b, 18c, 18d), open original nitrogen atmospheric valve (3) and control piper gas emptying ball valve
(14), test after nitrogen emptying and replacement of oxygen ball valve (19a, 19b, 19c, 19d), tank body in itself exhaust-valve (20a,
20b, 20c, 20d), the nitrogen in oxygen tank body (21a, 21b, 21c, 21d) is emptied, is carried out by normal procedure.
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| CN104697290B true CN104697290B (en) | 2017-11-10 |
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| CN110375195A (en) * | 2019-05-31 | 2019-10-25 | 浙江大唐国际绍兴江滨热电有限责任公司 | A kind of generator hydrogen method of replacing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325719A (en) * | 1979-09-19 | 1982-04-20 | Hitachi, Ltd. | Process for recovering nitrogen under pressure in air separation apparatus |
| CN1103157A (en) * | 1993-09-15 | 1995-05-31 | 气体产品与化学公司 | Cryogenic air separation process producing elevated pressure nitrogen by pumped liquid nitrogen |
| CN1116293A (en) * | 1994-05-10 | 1996-02-07 | 普拉塞尔技术有限公司 | Air boiling cryogenic rectification system for producing elecated pressure oxygen |
| CN204612361U (en) * | 2015-01-29 | 2015-09-02 | 中煤张家口煤矿机械有限责任公司 | The recovery system of the unnecessary nitrogen of fractionating column in oxygen generating plant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4447501B2 (en) * | 2005-03-29 | 2010-04-07 | 大陽日酸株式会社 | Air liquefaction separation method and apparatus |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325719A (en) * | 1979-09-19 | 1982-04-20 | Hitachi, Ltd. | Process for recovering nitrogen under pressure in air separation apparatus |
| CN1103157A (en) * | 1993-09-15 | 1995-05-31 | 气体产品与化学公司 | Cryogenic air separation process producing elevated pressure nitrogen by pumped liquid nitrogen |
| CN1116293A (en) * | 1994-05-10 | 1996-02-07 | 普拉塞尔技术有限公司 | Air boiling cryogenic rectification system for producing elecated pressure oxygen |
| CN204612361U (en) * | 2015-01-29 | 2015-09-02 | 中煤张家口煤矿机械有限责任公司 | The recovery system of the unnecessary nitrogen of fractionating column in oxygen generating plant |
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