CN102408298B - Method of distilling crude benzene by decompression method and device thereof - Google Patents
Method of distilling crude benzene by decompression method and device thereof Download PDFInfo
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Abstract
The invention relates to a method of distilling crude benzene by decompression method and a device thereof. Rich oil is preheated to 165-175 degrees centigrade after being subjected to heat exchange through an oil gas heat exchanger and a rich and poor oil heat exchanger; the rich oil enters in a crude benzene tower for crude benzene distillation; the crude benzene product is extracted from the tower top, and one part of the poor oil at the tower bottom is returned to the crude benzene tower as the distilling heat source after being heated by a tubular furnace while the other part of the poor oil is returned to a benzene washing tower after being subjected to heat exchanging and cooling; and the crude benzene steam escaped from the tower top enters in a crude benzene reflux groove after being cooled by the oil gas heat exchanger and a crude benzene condensing cooler, one part of the crude benzene steam is conveyed to the tower top as the back flow by a crude benzene reflux pump while the other part of the crude benzene steam enters in a crude benzene storage groove, and the crude benzene products are pumped to an oil depot. The lower part of the oil gas heat exchanger is connected with a crude benzene middle groove and is connected to a vacuum pump; the oil gas heat exchanger is connected with the crude benzene tower through the poor and rich oil heat exchanger; the bottom of the crude benzene tower is connected with the tubular furnace through a crude benzene tower circulation pump; and the tubular furnace is connected with a regeneration tower. The invention has the advantages of energy saving, emission reduction, environment protection, synergistic effect, low investment, small floor area, device reliability and flexibility and the like.
Description
Technical field
The present invention relates to the technique of coke oven gas purification system recoveries crude benzol, belong to coking engineering projects technology, be specifically related to a kind of improved decompression method crude benzol distillating method and device thereof.
Background technology
At present, the crude benzol distil process of most domestic mainly adopts the method for water at atmospheric pressure steam stripping, and its basic technology is under normal pressure, to utilize single tower to produce crude benzol or light benzene, this technical maturity, stable, but in still-process, can produce a large amount of waste water.
More domestic technician have done some to existing technique and have improved, the method and apparatus (patent No. CN101544913A) that Chinese patent literature discloses a kind of negative pressure benzene removal on September 30th, 2009.Its technique, for using vacuum pump to form negative pressure to debenzolizing tower and revivifier, is cancelled steam stripping at the bottom of debenzolizing tower tower and at the bottom of regenerator column, adopt respectively two tubular ovens to carry out tower at the bottom of circulating-heating thermal source is provided.Debenzolizing tower rectifying section adopts the separated light benzene of filler and heavy benzol, and this technique has reduced the temperature of debenzolizing tower tower top, has cancelled steam heating, has made certain contribution in energy-conserving and environment-protective.But this technique has increased vacuum pump, a regeneration tubular oven and many recycle pumps, investment and floor space are increased more; Power consumption increase is very large; Because system adopts negative-pressure operation, make diamond heating rich oil in addition, in stove, the possibility of vaporization increases considerably; Tower body is high, and the column plate number of plies is many.
In view of this, seek a kind of method crude benzol distillating method and device thereof of reducing pressure and become pursuing a goal of these those skilled in the art.
Summary of the invention
Task of the present invention is to provide a kind of decompression method crude benzol distillating method and device thereof, it has overcome the existing shortcoming of above-mentioned prior art, provide a kind of investment low, the adaptation of product is strong, stable operation is flexible, energy consumption is low, is difficult for tube oven method decompression crude benzol distil process and the device thereof of coking.
Technical solution of the present invention is as follows:
A decompression method crude benzol distillating method, comprises the following steps:
(1) rich oil is preheated to 165 ℃ to 175 ℃ after oil gas heat exchanger and poor oil-rich heat exchanger heat exchange;
(2) rich oil enters crude benzol tower and carries out crude benzol distillation;
(3) overhead extraction crude benzol product, the oil-poor part at the bottom of tower is returned to crude benzol tower after diamond heating, and as distillation thermal source, oil-poor the getting back to after heat exchange is cooling of another part washed benzene tower;
The crude benzene vapor that tower top is overflowed, after oily vapour interchanger, crude benzol condensate cooler are cooling, enters crude benzol backflash, and part crude benzene vapor is delivered to tower top as backflow with crude benzol reflux pump, and all the other crude benzene vapors enter crude benzol storage tank, then deliver to oil depot with crude benzol product pump.
Oil-poorly in described step (3) through debenzolizing tower recycle pump, extract out, send debenzolizing tower back to after diamond heating to 225 is ℃ to 239 ℃ at the bottom of.
Described crude benzol column overhead pressure is 15 kPa, and to 50kPa, tower bottom pressure is 25 kPa to 65kPa.
Described crude benzol column overhead temperature is 65 ℃ to 75 ℃, and column bottom temperature is 200 ℃ to 250 ℃.
A decompression method crude benzol water distilling apparatus, comprises tube furnace, regenerator column recycle pump, regenerator column, crude benzol tower recycle pump, crude benzol tower, hot oil-poor pump, poor oil-rich heat exchanger, oily vapour interchanger, vacuum pump and crude benzol medial launder;
The bottom of described oily vapour interchanger connects crude benzol medial launder, and crude benzol medial launder is connected to vacuum pump;
Described oily vapour interchanger connects the middle part of crude benzol tower by poor oil-rich heat exchanger, the top of crude benzol tower connects oily vapour interchanger, and the bottom of crude benzol tower connects poor oil-rich heat exchanger by hot oil-poor pump;
The bottom of described crude benzol tower connects tube furnace by crude benzol tower recycle pump, and tube furnace connects respectively the middle part of regenerator column and crude benzol tower, and regenerator column connects tube furnace by regenerator column recycle pump, and the top of regenerator column connects the middle part of crude benzol tower.
The number of plies of described crude benzol tower is 34 to 38.
A kind of innovative point that reduces pressure method crude benzol distillating method and device thereof of the present invention is, the rich oil that Xi Ben workshop section sends is preheated to 165 ℃ to 175 ℃ after oil gas heat exchanger and poor oil-rich heat exchanger heat exchange, without tubular oven heating, directly enter crude benzol tower and carry out crude benzol distillation, overhead extraction crude benzol product, side line is adopted naphtalene oil, an oil-poor part at the bottom of tower is returned to crude benzol tower after diamond heating, as distillation thermal source; Oil-poor the getting back to after heat exchange is cooling of another part washed benzene tower, and wherein: crude benzol column overhead pressure is 15 kPa to 50kPa, tower bottom pressure is 25 kPa to 65kPa; Tower top temperature is 65 ℃ to 75 ℃, and column bottom temperature is 200 ℃ to 250 ℃.
Preferably, in decompression crude benzol distil process of the present invention, rich oil charging, without diamond heating, directly enters crude benzol tower, has resistance little, and throw of pump is low, energy-conservation; Also have that vaporization rate is low, corrodibility is little and tube furnace is difficult for the advantages such as coking, stable operation, and tradition or other technique power consumption are high and perishable.
Preferably, in decompression crude benzol distil process of the present invention, de-benzene and regeneration are only with a tube furnace, and employing radial room independence adjustment structure, the distinctive diamond heating regulative mode of tool, and Shi Mei road heating medium all can free adjustment temperature.In addition, regeneration system rapidly can be according to different coke-oven plants practical situation, can select to determine whether put into operation, even and regeneration system rapidly does not move, the RS Regenerator Section of tube furnace is heating cycle washing oil in addition still, and tube furnace is utilized to greatest extent.
Preferably, in decompression crude benzol distil process of the present invention, distinctive tray structure pattern, Effective Anti is stifled, is applicable to coking dielectric property; Turndown ratio is applicable to coke oven capacity variation; Product is high-quality crude benzol, can meet the specification of quality of benzene hydrogenation device to raw material crude benzol.
Preferably, in decompression crude benzol distil process of the present invention, the column plate number of plies is few, and general 34 to 38, few nearly 20 than light benzene tower; Side line can be adopted naphtalene oil but not adopt heavy benzol; Column bottom temperature is low, can prevent circulating washing oil because of heat rotten.
Preferably, in decompression crude benzol distil process of the present invention, vacuum system with non-water class medium as pendular ring medium, non-wastewater discharge, environment protecting is good.
Preferably, in decompression crude benzol distil process of the present invention, at stove exit, near tower opening for feed place, remote valve is set, in heating medium stove, vaporizes preventing, corrosion boiler tube.
In above-mentioned modified version decompression crude benzol distil process, adopt the oily water separation of distinctive simple and practical crude benzol backflash; Oil vapour interchanger selects not stop up corrosion resistant tapered pipe heat exchanger.
The present invention, owing to having adopted above technical scheme, makes it compared with prior art, the invention has the advantages that energy-conservation, reduction of discharging, environmental protection, synergy, all respects such as investment is low, floor space is little, device reliability and handiness.Wherein: aspect energy-conservation: save coal gas more than 20%; Reduce discharging: without newly-increased processing wastewater; Environmental protection: subnormal ambient, has the benzene class material of great bodily injury to be difficult for revealing to human body; Synergy: the yield of crude benzol has improved 0.05 to 0.15%; Invest low little with floor space: because reducing by a stove, investment and floor space are all reduced to some extent; Device reliability: rich oil charging is without diamond heating, have do not vaporize, the advantage such as noncoking, low corrosion; Device handiness: regeneration system rapidly can be according to different coke-oven plants practical situation, can select to determine whether put into operation, even and regeneration system rapidly does not move, the RS Regenerator Section of tube furnace is heating cycle washing oil in addition still, and tube furnace is utilized to greatest extent.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of method crude benzol water distilling apparatus that reduces pressure of the present invention.
Reference numeral:
1 is tube furnace, and 2 is regenerator column recycle pump, and 3 is regenerator column, and 4 is crude benzol tower recycle pump, and 5 is naphtalene oil, and 6 is crude benzol tower, and 7 is hot oil-poor pump, and 8 is poor oil-rich heat exchanger, and 9 is oil-poor, and 10 is rich oil, and 11 is oily vapour interchanger, and 12 is vacuum pump, and 13 is crude benzol medial launder.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
The invention provides a kind of decompression method crude benzol distillating method, comprise the following steps:
(1) rich oil is preheated to 165 ℃ to 175 ℃ after oil gas heat exchanger and poor oil-rich heat exchanger heat exchange.
(2) rich oil enters crude benzol tower and carries out crude benzol distillation.
(3) overhead extraction crude benzol product, the oil-poor part at the bottom of tower is returned to crude benzol tower after diamond heating, and as distillation thermal source, oil-poor the getting back to after heat exchange is cooling of another part washed benzene tower.
In described step (3), the crude benzene vapor that tower top is overflowed, after oily vapour interchanger, crude benzol condensate cooler are cooling, enters crude benzol backflash, and part crude benzene vapor is delivered to tower top as backflow with crude benzol reflux pump, all the other crude benzene vapors enter crude benzol storage tank, then deliver to oil depot with crude benzol product pump.
In described step (3), oil-poorly through debenzolizing tower recycle pump, extract out, send debenzolizing tower back to after diamond heating to 225 is ℃ to 239 ℃ at the bottom of.
Crude benzol column overhead pressure is 15 kPa, and to 50kPa, tower bottom pressure is 25 kPa to 65kPa.
Crude benzol column overhead temperature is 65 ℃ to 75 ℃, and column bottom temperature is 200 ℃ to 250 ℃.
Referring to Fig. 1, the invention provides a kind of decompression method crude benzol water distilling apparatus, it is mainly comprised of tube furnace 1, regenerator column recycle pump 2, regenerator column 3, crude benzol tower recycle pump 4, crude benzol tower 6, hot oil-poor pump 7, poor oil-rich heat exchanger 8, oily vapour interchanger 11, vacuum pump 12 and crude benzol medial launder 13.
The bottom of oil vapour interchanger 11 connects crude benzol medial launder 13, and crude benzol medial launder 13 is connected to vacuum pump 12.Oil vapour interchanger 11 connects the middle part of crude benzol tower 6 by poor oil-rich heat exchanger 8, the top of crude benzol tower 6 connects oily vapour interchanger 11, and the bottom of crude benzol tower 6 connects poor oil-rich heat exchanger 8 by hot oil-poor pump 7.
The bottom of crude benzol tower 6 connects tube furnace 1 by crude benzol tower recycle pump 4, and tube furnace 1 connects respectively the middle part of regenerator column 3 and crude benzol tower 6, and regenerator column 3 connects tube furnace 1 by regenerator column recycle pump 2, and the top of regenerator column 3 connects the middle part of crude benzol tower 6.The number of plies of crude benzol tower 6 is 34 to 38.
The actual use-pattern of decompression method crude benzol distillating method of the present invention and device thereof is as follows:
Certain coke-oven plant coking engineering projects gas cleaning system crude benzol distillation workshop section has adopted above-mentioned decompression crude benzol distil process, and concise and to the point technical process is as follows:
The rich oil of sending here from whole cold wash benzene device successively warp let-off oil vapour interchanger, poor oil-rich heat exchanger (without diamond heating) heat exchange to 165 ℃ enters debenzolizing tower to 175 ℃.Debenzolizing tower Di mono-tunnel heat is oil-poor extracts out through debenzolizing tower recycle pump, send debenzolizing tower back to after diamond heating to 225 is ℃ to 239 ℃ at the bottom of, as the thermal source of debenzolizing tower distillation.The crude benzene vapor that tower top is overflowed, after oily vapour interchanger, crude benzol condensate cooler are cooling, enters crude benzol backflash, and part is delivered to tower top as backflow with crude benzol reflux pump, and all the other enter crude benzol storage tank, then deliver to oil depot with crude benzol product pump.
With the oil-poor pump of heat, extract the heat of discharging at the bottom of debenzolizing tower out oil-poor, after poor oil-rich heat exchanger heat exchange, enter one section of oil-poor water cooler, enter oil-poor groove after cooling, then with cold oil-poor pump extraction, after two sections of oil-poor water coolers are cooled to 27 ℃～29 ℃, remove whole cold wash benzene device.
The noncondensable gas of discharging from crude benzol backflash top is delivered to vacuum pump after noncondensable gas water cooler is cooling, after extracting out, vacuum pump delivers coal in cleaned coal feed channel, at this, by the vacuum suction amount of vacuum pump, regulate the working pressure at debenzolizing tower top, it is operated under suitable condition of negative pressure.
At debenzolizing tower side line, draw naphtalene oil fraction, oil-poor containing naphthalene to reduce.
From tube furnace outlet circulating washing oil, draw 1%～2% hot washing oil, send into regeneration in regenerator column.Hot washing oil at the bottom of regenerator column is extracted out through regenerator column recycle pump, send regenerator column back to after diamond heating to 240 is ℃ to 265 ℃ at the bottom of, as the thermal source of regenerator column distillation.Regeneration overhead gas enters debenzolizing tower, separately from regenerator column circulating-pump outlet, draws a road Residual oil and delivers in naphtalene oil groove, then use pumping oil depot Huo Guleng workshop section.
The multiple advantages such as in sum, decompression method crude benzol distillating method of the present invention and device thereof have energy-conservation, reduction of discharging, environmental protection, synergy, investment is low, floor space is little, device reliability and handiness.
Certainly, those skilled in the art in the art will be appreciated that, above-described embodiment is only for the present invention is described, and not as limitation of the invention, as long as within the scope of connotation of the present invention, the variation of above-described embodiment, modification etc. all will be dropped in the scope of the claims in the present invention.
Claims (2)
1. a decompression method crude benzol distillating method, is characterized in that, comprises the following steps:
(1) rich oil is preheated to 165 ℃ to 175 ℃ after oil gas heat exchanger and poor oil-rich heat exchanger heat exchange;
(2) rich oil enters crude benzol tower and carries out crude benzol distillation;
(3) overhead extraction crude benzol product, the oil-poor part at the bottom of tower is returned to crude benzol tower after diamond heating, and as distillation thermal source, oil-poor the getting back to after heat exchange is cooling of another part washed benzene tower;
Oil-poorly through crude benzol tower recycle pump, extract out, send crude benzol tower back to after diamond heating to 225 is ℃ to 239 ℃ at the bottom of;
The crude benzene vapor that tower top is overflowed, after oily vapour interchanger, crude benzol condensate cooler are cooling, enters crude benzol backflash, and part crude benzene vapor is delivered to tower top as backflow with crude benzol reflux pump, and all the other crude benzene vapors enter crude benzol storage tank, then deliver to oil depot with crude benzol product pump;
Wherein: oil-poor by the heat of discharging at the bottom of hot oil-poor pump extraction crude benzol tower, after poor oil-rich heat exchanger heat exchange, enter one section of oil-poor water cooler, after cooling, enter oil-poor groove, then with cold oil-poor pump, extract out and after two sections of oil-poor water coolers are cooled to 27 ℃～29 ℃, remove whole cold wash benzene device;
The noncondensable gas of discharging from crude benzol backflash top is delivered to vacuum pump after noncondensable gas water cooler is cooling, after extracting out, vacuum pump delivers coal in cleaned coal feed channel, at this, by the vacuum suction amount of vacuum pump, regulate the working pressure of crude benzol top of tower, it is operated under suitable condition of negative pressure;
At crude benzol tower side line, draw naphtalene oil fraction to reduce the oil-poor naphthalene that contains;
Described crude benzol column overhead pressure is 15 kPa, and to 50kPa, tower bottom pressure is 25 kPa to 65kPa;
Described crude benzol column overhead temperature is 65 ℃ to 75 ℃, and column bottom temperature is 200 ℃ to 250 ℃;
In decompression crude benzol distil process, rich oil charging, without diamond heating, directly enters crude benzol tower; De-benzene and regeneration are only with a tube furnace, and employing radial room independence adjustment structure, the distinctive diamond heating regulative mode of tool, and Shi Mei road heating medium all can free adjustment temperature.
2. a decompression method crude benzol water distilling apparatus, is characterized in that: comprise tube furnace, regenerator column recycle pump, regenerator column, crude benzol tower recycle pump, crude benzol tower, hot oil-poor pump, poor oil-rich heat exchanger, oily vapour interchanger, vacuum pump and crude benzol medial launder;
The bottom of described oily vapour interchanger connects crude benzol medial launder, and crude benzol medial launder is connected to vacuum pump;
Described oily vapour interchanger connects the middle part of crude benzol tower by poor oil-rich heat exchanger, the top of crude benzol tower connects oily vapour interchanger, and the bottom of crude benzol tower connects poor oil-rich heat exchanger by hot oil-poor pump;
The bottom of described crude benzol tower connects tube furnace by crude benzol tower recycle pump, and tube furnace connects respectively the middle part of regenerator column and crude benzol tower, and regenerator column connects tube furnace by regenerator column recycle pump, and the top of regenerator column connects the middle part of crude benzol tower;
Described regenerator column circulating-pump outlet is drawn a road Residual oil and is delivered in naphtalene oil groove, then uses pumping oil depot Huo Guleng workshop section;
The number of plies of described crude benzol tower is 34 to 38;
In described decompression method crude benzol water distilling apparatus, de-benzene and regeneration are only with a tube furnace, and employing radial room independence adjustment structure, the distinctive diamond heating regulative mode of tool, and Shi Mei road heating medium all can free adjustment temperature.
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| CN102796571B (en) * | 2012-07-25 | 2014-04-30 | 济钢集团国际工程技术有限公司 | System for producing light benzene by performing negative pressure debenzolization on rich oil |
| CN102827646B (en) * | 2012-09-07 | 2014-03-26 | 云南大为制焦有限公司 | Coke oven gas debenzolization system |
| CN103673647A (en) * | 2013-12-03 | 2014-03-26 | 天津华能北方热力设备有限公司 | Method and equipment for heating benzene-washing rich oil with coke oven flue exhaust gas waste heat |
| CN103801099A (en) * | 2014-02-26 | 2014-05-21 | 北京首钢国际工程技术有限公司 | Negative-pressure distillation process system for integrated debenzolization and regeneration tower |
| CN104312638B (en) * | 2014-10-30 | 2016-04-13 | 济南冶金化工设备有限公司 | Thermal coupling negative pressure benzene removal, regeneration integrated apparatus |
| CN104327864B (en) * | 2014-11-15 | 2016-08-31 | 马钢(集团)控股有限公司 | A kind of coke dry quenching furnace entrance recyclegas cooling system and cooling means thereof |
| CN104403704B (en) * | 2014-11-21 | 2016-05-11 | 中冶焦耐工程技术有限公司 | Steam Heating washing oil negative pressure crude benzol distil process and equipment |
| CN104961620B (en) * | 2015-06-03 | 2017-04-12 | 马钢(集团)控股有限公司 | Method for treating benzene hydrogenated polymer |
| CN104910972B (en) * | 2015-06-26 | 2017-10-27 | 山东钢铁股份有限公司 | A kind of rich oil de-benzene system for handling coke-stove gas |
| CN104927929A (en) * | 2015-06-29 | 2015-09-23 | 济南冶金化工设备有限公司 | Crude benzene distilling and washing oil regenerating heating system and method |
| CN105154144B (en) * | 2015-08-31 | 2017-12-26 | 山东铁雄新沙能源有限公司 | A kind of negative pressure benzene removal device and de- benzene method |
| CN107628923A (en) * | 2017-09-29 | 2018-01-26 | 王书虎 | A kind of negative pressure benzene removal system and method for rich oil half |
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