CN101879398B - Recovery process of coking crude benzene dispersing gas and device thereof - Google Patents
Recovery process of coking crude benzene dispersing gas and device thereof Download PDFInfo
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- CN101879398B CN101879398B CN2010102131108A CN201010213110A CN101879398B CN 101879398 B CN101879398 B CN 101879398B CN 2010102131108 A CN2010102131108 A CN 2010102131108A CN 201010213110 A CN201010213110 A CN 201010213110A CN 101879398 B CN101879398 B CN 101879398B
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Abstract
The invention belongs to the technical field of coke oven gas purification, and in particular relates to the recovery process of coking crude benzene dispersing gas and a device thereof. The recovery process comprises the following steps: the dispersing gas in each storage tank in a crude benzene production area is intensively recovered through a pipeline and then introduced into a special washing tower; wash oil at the temperature of 25-28 DEG C is sprayed from the top of the washing tower so as to absorb benzene, naphthalene and other organic matters from the dispersing gas; the wash oil absorbing benzene, naphthalene and other organic matters flows automatically into the bottom of the tower and then enters a front pipe of a rich oil pump through a communicating pipe at the bottom of the tower to be mixed with rich oil; and finally the obtained mixed oil is treated in a debenzolization tower. The invention requires no operating cost, greatly reduces toxic waste gas generated in the existing coking crude benzene production area, and improves operating environment.
Description
Technical field
The invention belongs to the coke oven gas purification technical field, a kind of specifically recovery process of coking crude benzene dispersing gas and device thereof.
Background technology
The coke-oven plant is in the crude benzol recovery zone of gas purification; Because technological requirement; The exhaust stack of light benzene storage tank, light benzene condensate cooler, residue groove and naphtalene oil groove etc. all is a discharging directly into atmosphere in design process, causes a large amount of waste gas such as benzene, naphthalene that contain to get into atmosphere, contaminated environment so on the one hand; Cause benzene, the naphthalene of a large amount of high values to run off the waste resource on the other hand.
Above-mentioned two problems to coking crude benzene storage tank dispersing gas; The coke-oven plant that has at present inserts the preceding gas piping of gas-blowing engine through pipeline; And adopt purified gas to carry out pressure balance: first: this technology increases coal gas loopback amount, has increased considerably the operating load of gas-blowing engine; Second: the seal request to storage tank is high, and makes the crude benzol storage tank be pumped into negative pressure easily, causes oxygen content in coal gas to increase; The 3rd: oil gas a large amount of in the crude benzene dispersing gas get into gas piping again, and the coal gas that makes oil removing originally is entrained oil again.
People such as Wang Yongshu are at " Liu Gang technology " S1 delivered on the phase in 2006 " commissioning experience that goes into operation of crude benzene dispersing gas recovery system "; What wherein adopted is the method that directly inserts the preceding gas piping of gas-blowing engine; And on total access tube, automatic regulating valve is installed; Adopt purified gas to carry out pressure balance and reach the purpose that reclaims dispersing gas, there are 3 shortcomings as stated in this method, seldom is used.
The patent No. is 03113204.9 " technology and personal cleansing device thereof are washed in regeneration wash heat "; This invention is raised the liquid bath deslagging for crude benzol and is handled; Water regenerated from washing slag discharging tail gas; A large amount of steam in the tail gas are washed, simultaneously most of harmful substance is with down together, washed sewage regularly enters sewage disposal system.This technology only adopts the washing cooling to spray to residue and handles, rely on characterization of adsorption to remove partial impurities, but can't remove for benzene gas, and produce a large amount of cleaning solutions, and the oil-containing cleaning solution will seriously cause the sewerage paralysis to sewage disposal system.
Summary of the invention
Technical problem to be solved by this invention is: to the shortcoming of above prior art existence; A kind of recovery process of coking crude benzene dispersing gas and device thereof are proposed; Can reclaim the noxious material in the dispersing gas of each storage tank of crude benzol Production Regional, reclaim benzene and the naphthalene that high value is arranged simultaneously.
The technical scheme that the present invention solves above technical problem is:
Recovery process of coking crude benzene dispersing gas, carry out according to the following steps:
(1) concentrates recovery to the dispersing gas of each storage tank of gas purification crude benzol recovery zone, coke-oven plant through pipeline, and guide in the scrubbing tower through pipeline;
(2) washing oil behind two sections oil-poor coolers of employing coke-oven plant's crude benzol operation sprays in scrubbing tower as absorbing flushing liquor, absorbs benzene, naphthalene and other machine thing from the dispersing gas that each storage tank comes;
(3) absorbed benzene, naphthalene and other organic washing oil and flowed automatically at the bottom of the tower,, mixed back entering debenzolizing tower with rich oil and handle through the communicating pipe at the bottom of the tower getting into the rich oil groove;
(4) in debenzolizing tower, utilizing steam that the rich oil that contains benzene, contains naphthalene is steamed blows; Benzene, naphthalene are separated from washing oil; The benzene of gas phase, naphthalene flow in debenzolizing tower with steam from lower to upper, when naphthalene arrives the debenzolizing tower middle and upper part, because the decline gradually of temperature; When being lower than the boiling point of naphthalene, naphthalene just is condensed into liquid state and in tower, flows out;
When (5) benzene reaches the debenzolizing tower top with steam, spray through the liquid phenenyl with 25～30 ℃, control is sprayed the back gas phase temperature and is flowed out from cat head at 79～80 ℃, is condensed into benzene vapour through condenser 25～30 ℃ liquid phenenyl again;
(6) removing benzene, naphthalene and other organic incoagulability tail gas directly discharges.
Coking crude benzene dispersing gas retracting device of the present invention comprises scrubbing tower, and the top of scrubbing tower is provided with the flushing liquor shower nozzle, and the bottom is provided with dispersing gas import distributing pipe, and the bottom is connected with the rich oil pipe; The flushing liquor shower nozzle links to each other with the bottom of two sections oil-poor coolers through the washing oil pipe; Dispersing gas import distributing pipe diffuses tracheae through the dispersing gas tube connector with each storage tank and links to each other; Before the rich oil pipe is connected on the rich oil pump that links to each other with the rich oil trench bottom.
Washing oil is the brown oily liquids, and is flammable.Key component is a methyl naphthalene, dimethylnaphthalene, cresols, xylenol, higher boiling phenol, heavy pyridine base and quinoline etc.110～115 ℃ of flash-points, 127～130 ℃ of burning-points, 478～480 ℃ of self-ignition points, 265 ℃ of boiling points.
Rich oil is meant in the absorption process of natural gas or refinery gas, the absorption liquid of extracting out at the bottom of the absorption column of gas that is rich in hydrocarbon matter component.
Like this; Concentrate recovery to the dispersing gas of each storage tank of crude benzol Production Regional through pipeline, guide in the scrubbing tower, in scrubbing tower, adopt crude benzol operation existing washing oil in coke-oven plant's to spray; Absorb benzene, naphthalene and other organic matter in the dispersing gas; Absorbed benzene, naphthalene and other organic washing oil and flowed automatically at the bottom of the tower,, be mixed into debenzolizing tower with rich oil and handle through getting into rich oil pump preceding pipeline the communicating pipe at the bottom of the tower; Under the prerequisite that does not need operating cost, can reduce the poisonous fume that existing coking crude benzene Production Regional produces again significantly, improve operating environment.
Technical scheme as the further qualification of the present invention:
The temperature of washing oil is 25～28 ℃, and washing oil absorbs benzene class material about 25～28 ℃, and it is maximum to absorb power, best results.
The sprinkling direction of washing oil in scrubbing tower is for spray from top to bottom, and washing oil contacts with dispersing gas is reverse from top to bottom, makes both full contacts, at utmost absorbs benzene, naphthalene in the dispersing gas.
For from the bottom up, dispersing gas flows dispersing gas from the bottom up, need not increase extra transmitting power, saves production cost in the flow direction of scrubbing tower.
Advantage of the present invention is: the recovery technology of coking crude benzene dispersing gas of the present invention and device technique thereof are simple, practical, organic efficiency is high.Utilize available dynamic and equipment, the washing oil through normal temperature absorbs dispersing gas, and it is big to absorb power; Effective, and need not increase extra power consumption, output that can increasing considerably product; Reduce production costs, reduce the discharging of a large amount of nuisances simultaneously, improve environment.
Description of drawings
Fig. 1 is the connection sketch map of apparatus of the present invention.
The specific embodiment
Embodiment one
The recovery process of coking crude benzene dispersing gas of present embodiment, carry out according to the following steps:
(1) concentrate to reclaim the dispersing gas of each storage tank of gas purification crude benzol recovery zone, coke-oven plant through pipeline, and guide in the scrubbing tower through pipeline, dispersing gas in the flow direction of scrubbing tower for from the bottom up;
(2) washing oil behind two sections oil-poor coolers of employing coke-oven plant's crude benzol operation is as absorbing flushing liquor; In scrubbing tower, spray; The temperature of washing oil is 25 ℃, and the sprinkling direction of washing oil in scrubbing tower absorbs benzene, naphthalene and other machine thing from the dispersing gas that each storage tank comes for spraying from top to bottom;
(3) absorbed benzene, naphthalene and other organic washing oil and flowed automatically at the bottom of the tower,, mixed back entering debenzolizing tower with rich oil and handle through the communicating pipe at the bottom of the tower getting into the rich oil groove;
(4) in debenzolizing tower, utilizing steam that the rich oil that contains benzene, contains naphthalene is steamed blows; Benzene, naphthalene are separated from washing oil; The benzene of gas phase, naphthalene flow in debenzolizing tower with steam from lower to upper, when naphthalene arrives the debenzolizing tower middle and upper part, because the decline gradually of temperature; When being lower than the boiling point of naphthalene, naphthalene just is condensed into liquid state and in tower, flows out;
When (5) benzene reaches the debenzolizing tower top with steam, spray through the liquid phenenyl with 25 ℃, control is sprayed the back gas phase temperature and is flowed out from cat head at 79 ℃, is condensed into benzene vapour through condenser 25 ℃ liquid phenenyl again.
(6) removing benzene, naphthalene and other organic incoagulability tail gas directly discharges.
Embodiment two
The recovery process of coking crude benzene dispersing gas of present embodiment, carry out according to the following steps:
(1) concentrate to reclaim the dispersing gas of each storage tank of gas purification crude benzol recovery zone, coke-oven plant through pipeline, and guide in the scrubbing tower through pipeline, dispersing gas in the flow direction of scrubbing tower for from the bottom up;
(2) washing oil behind two sections oil-poor coolers of employing coke-oven plant's crude benzol operation is as absorbing flushing liquor; In scrubbing tower, spray; The temperature of washing oil is 26 ℃, and the sprinkling direction of washing oil in scrubbing tower absorbs benzene, naphthalene and other machine thing from the dispersing gas that each storage tank comes for spraying from top to bottom;
(3) absorbed benzene, naphthalene and other organic washing oil and flowed automatically at the bottom of the tower,, mixed back entering debenzolizing tower with rich oil and handle through the communicating pipe at the bottom of the tower getting into the rich oil groove;
(4) in debenzolizing tower, utilizing steam that the rich oil that contains benzene, contains naphthalene is steamed blows; Benzene, naphthalene are separated from washing oil; The benzene of gas phase, naphthalene flow in debenzolizing tower with steam from lower to upper, when naphthalene arrives the debenzolizing tower middle and upper part, because the decline gradually of temperature; When being lower than the boiling point of naphthalene, naphthalene just is condensed into liquid state and in tower, flows out;
When (5) benzene reaches the debenzolizing tower top with steam, spray through the liquid phenenyl with 28 ℃, control is sprayed the back gas phase temperature and is flowed out from cat head at 80 ℃, is condensed into benzene vapour through condenser 28 ℃ liquid phenenyl again.
(6) removing benzene, naphthalene and other organic incoagulability tail gas directly discharges.
Embodiment three
The recovery process of coking crude benzene dispersing gas of present embodiment, carry out according to the following steps:
(1) concentrate to reclaim the dispersing gas of each storage tank of gas purification crude benzol recovery zone, coke-oven plant through pipeline, and guide in the scrubbing tower through pipeline, dispersing gas in the flow direction of scrubbing tower for from the bottom up;
(2) washing oil behind two sections oil-poor coolers of employing coke-oven plant's crude benzol operation is as absorbing flushing liquor; In scrubbing tower, spray; The temperature of washing oil is 28 ℃, and the sprinkling direction of washing oil in scrubbing tower absorbs benzene, naphthalene and other machine thing from the dispersing gas that each storage tank comes for spraying from top to bottom;
(3) absorbed benzene, naphthalene and other organic washing oil and flowed automatically at the bottom of the tower,, mixed back entering debenzolizing tower with rich oil and handle through the communicating pipe at the bottom of the tower getting into the rich oil groove;
(4) in debenzolizing tower, utilizing steam that the rich oil that contains benzene, contains naphthalene is steamed blows; Benzene, naphthalene are separated from washing oil; The benzene of gas phase, naphthalene flow in debenzolizing tower with steam from lower to upper, when naphthalene arrives the debenzolizing tower middle and upper part, because the decline gradually of temperature; When being lower than the boiling point of naphthalene, naphthalene just is condensed into liquid state and in tower, flows out;
When (5) benzene reaches the debenzolizing tower top with steam, spray through the liquid phenenyl with 30 ℃, control is sprayed the back gas phase temperature and is flowed out from cat head at 80 ℃, is condensed into benzene vapour through condenser 30 ℃ liquid phenenyl again.
(6) removing benzene, naphthalene and other organic incoagulability tail gas directly discharges.
Apparatus of the present invention connect as shown in Figure 1, comprise scrubbing tower 1, and the top of scrubbing tower 1 is provided with flushing liquor shower nozzle 2, and the bottom is provided with dispersing gas import distributing pipe 3, and the bottom is connected with rich oil pipe 7; Flushing liquor shower nozzle 2 links to each other with the bottom of two sections oil-poor coolers 10 through washing oil pipe 9; Dispersing gas import distributing pipe 3 diffuses tracheae 5 through dispersing gas tube connector 4 and each storage tank and links to each other; Before rich oil pipe 7 is connected on the rich oil pump 8 that links to each other with rich oil groove 6 bottoms.
Crude benzene dispersing gas connects with dispersing gas tube connector 4 through the mouth that diffuses on groove top, and dispersing gas tube connector 4 connection endpoints are the bottom dispersing gas inlet dispersing gas import distributing pipe 3 of scrubbing tower 1.The contain benzene, naphthalene washing oil of scrubbing tower 1 bottom link to each other with rich oil groove 6 with rich oil pipe 7 through scrubbing tower 1 bottom.The washing oil flushing liquor at scrubbing tower 1 top is connected to scrubbing tower washing oil inlet flushing liquor shower nozzle 2 through the washing oil pipe 9 of rich oil pipe 7 behind two sections oil-poor coolers.
The present invention is not only applicable to handle the crude benzene dispersing gas of coke-oven plant and is applicable to the similar processing that contains the organic matter dispersing gas.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of requirement protection of the present invention.
Claims (5)
1. recovery process of coking crude benzene dispersing gas is characterized in that: carry out according to the following steps
(1) concentrates recovery to the dispersing gas of each storage tank of gas purification crude benzol recovery zone, coke-oven plant through pipeline, and guide in the scrubbing tower through pipeline;
(2) washing oil behind two sections oil-poor coolers of employing coke-oven plant's crude benzol operation sprays in scrubbing tower as absorbing flushing liquor, absorbs benzene, naphthalene and other organic matter from the dispersing gas that each storage tank comes;
(3) absorbed benzene, naphthalene and other organic washing oil and flowed automatically at the bottom of the tower,, mixed back entering debenzolizing tower with rich oil and handle through the communicating pipe at the bottom of the tower getting into the rich oil groove;
(4) in debenzolizing tower, utilizing steam that the rich oil that contains benzene, contains naphthalene is steamed blows; Benzene, naphthalene are separated from washing oil; The benzene of gas phase, naphthalene flow in debenzolizing tower with steam from lower to upper, when naphthalene arrives the debenzolizing tower middle and upper part, because the decline gradually of temperature; When being lower than the boiling point of naphthalene, naphthalene just is condensed into liquid state and in tower, flows out;
When (5) benzene reaches the debenzolizing tower top with steam, spray through the liquid phenenyl with 25～30 ℃, control is sprayed the back gas phase temperature and is flowed out from cat head at 79～80 ℃, is condensed into benzene vapour through condenser 25～30 ℃ liquid phenenyl again;
(6) removing benzene, naphthalene and other organic incoagulability tail gas directly discharges.
2. recovery process of coking crude benzene dispersing gas as claimed in claim 1 is characterized in that: the temperature of said washing oil is 25～28 ℃.
3. recovery process of coking crude benzene dispersing gas as claimed in claim 1 is characterized in that: the sprinkling direction of washing oil in scrubbing tower is for spray from top to bottom.
4. recovery process of coking crude benzene dispersing gas as claimed in claim 1 is characterized in that: dispersing gas in the flow direction of scrubbing tower for from the bottom up.
5. the device that is used for the said recovery process of coking crude benzene dispersing gas of above arbitrary claim; It is characterized in that: comprise scrubbing tower (1); The top of said scrubbing tower (1) is provided with flushing liquor shower nozzle (2), and the bottom is provided with dispersing gas import distributing pipe (3), and the bottom is connected with rich oil pipe (7); Said flushing liquor shower nozzle (2) links to each other with the bottom of two sections oil-poor coolers (10) through washing oil pipe (9); Said dispersing gas import distributing pipe (3) diffuses tracheae (5) through dispersing gas tube connector (4) and each storage tank and links to each other; It is preceding that said rich oil pipe (7) is connected on the rich oil pump (8) that links to each other with rich oil groove (6) bottom.
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| CN102125802B (en) * | 2011-01-25 | 2013-03-27 | 云南昆钢煤焦化有限公司 | Method for recovering and purifying waste gas during crude benzene hydrogenation refining production |
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| CN112322357A (en) * | 2020-10-21 | 2021-02-05 | 宝钢工程技术集团有限公司 | Novel coking diffused gas washing process and system |
| CN114712995A (en) * | 2022-05-06 | 2022-07-08 | 广东韶钢松山股份有限公司 | Treatment method for diffused gas of crude benzene system |
| CN115069070A (en) * | 2022-07-28 | 2022-09-20 | 鞍钢化学科技有限公司 | System and method for anaerobic positive pressure recovery of coal-based needle coke tail gas |
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Effective date of registration: 20191213 Address after: 210000 No. 188 Ningliu Road, Jiangbei New District, Nanjing City, Jiangsu Province Patentee after: Nanjing Jin Han Environmental Protection Technology Co., Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210035 xiejiadian Patentee before: Nanjing Iron and Steel Co., Ltd. |
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