CN107760389A - The technique for carrying out eluting benzene efficiency based on coal gas in raising coal - Google Patents

Abstract

The invention discloses the technique that coal gas in a kind of coal based on raising carries out eluting benzene efficiency, coal gas from ammonium sulfate workshop section, enter tower from washing benzene column bottom after final cooling tower cools down, from bottom to top by washing benzene column packing layer, with the circulating washing oil counter current contacting of tower top spray, benzene in coal gas is absorbed by circulating washing oil, then is left after the mist catching section removing droplet of tower and wash benzene column；Washing oil is after oil gas heat exchanger, poor oil-rich heat exchanger heat exchange, enter debenzolizing tower after diamond heating again, herein with regenerator come superheated steam directly stripped and distilled, crude benzene vapor is delivered to after poor oil-rich heat exchanger heat exchange cooling from the washing oil after debenzolizing tower top effusion, de- benzene and washes benzene series system recycling；Oil gas enters oil gas heat exchanger, crude benzol condensate cooler, and gained crude benzol is after oil water separator separation water, into backflash, with backflow pumped back debenzolizing tower top.The benzene that the PROCESS FOR TREATMENT contains so that its content is reduced to the safety value of setting, and the pollution for environment is small, ensures health.

Description

The technique for carrying out eluting benzene efficiency based on coal gas in raising coal

Technical field

The present invention relates to a kind of technique, more particularly, to a kind of based on the work for improving coal gas in coal and elute benzene efficiency Skill.

Background technology

Coal gas is using coal as the gas containing combustible component made from Raw material processing.According to processing method, gas characteristic and Purposes is divided into：What coal gasification obtained is water-gas, semiwater gas, air gas（Or producer gas）, the hair of these coal gas Calorific value is relatively low, therefore is referred to as low-heat value gas again；The gas that coking obtains in dry distillation of coal method is referred to as coke-stove gas, blast furnace gas. Belong to middle calorific value of gas, be available for city to make domestic fuel.Carbon monoxide and hydrogen in coal gas are important industrial chemicals.Coke oven Coal gas refers to be made into coal for coking with several bituminous coal, in coke oven after high-temperature retorting, in output coke and tar product Fuel gas obtained by simultaneously, it is the byproduct of coking product.Mainly make fuel and industrial chemicals.Coke-stove gas is mainly by hydrogen Gas and methane are formed, and account for 56% and 27% respectively, and have a small amount of carbon monoxide, carbon dioxide, nitrogen, oxygen and other hydro carbons.Coal Gas is to use the solid materials such as coal or coke, through made from destructive distillation or vaporization, its main component has carbon monoxide, methane and hydrogen etc.. Therefore, coal gas is poisonous, is easy to air and forms explosive mixture, should cause hig diligence during use.Natural gas broad sense, which refers to, buries The general name of the gas of self-assembling formation in stratum.But commonly called natural gas, which only refers to, to be stored in one kind of stratum deeper part and is rich in The fuel gas of hydrocarbon, and it is frequently referred to associated gas with the natural gas of oil symbiosis.Natural gas is by before 1 years Organic substance is transformed, and main component is methane, further according to different geology formation conditions, the still second containing varying number The non-hydrocarbonaceous materials such as the low-carbon alkanes such as alkane, propane, butane, pentane, hexane and carbon dioxide, nitrogen, hydrogen, sulfide；Have Gas field in also contain helium.In the coal gas obtained by coal, containing substantial amounts of benzene, tradition is to the processing of these benzene Not thoroughly, cause coal gas using when impurity be present, produce many harmful substances, seriously pollute environment, people's body is caused Injury.

The content of the invention

It is an object of the invention to overcome above-mentioned existing process not thorough to the processing of these benzene, coal gas is caused to exist when using Impurity, many harmful substances are produced, seriously pollute environment, the problem of being damaged to people's body, devised one kind and be based on Improve the technique that coal gas in coal elute benzene efficiency, the benzene that the PROCESS FOR TREATMENT contains so that its content is reduced to setting Safety value, people's use is safer, and the pollution for environment is small, ensures health, solves existing process to these benzene Processing it is not thorough, cause coal gas using when impurity be present, produce many harmful substances, seriously pollute environment, to people's body The problem of damaging.

The purpose of the present invention is achieved through the following technical solutions：Based on coal gas in raising coal elute the work of benzene efficiency Skill, comprise the following steps：

（1）Wash benzene：Coal gas from ammonium sulfate workshop section, enter tower from washing benzene column bottom after final cooling tower cools down, from bottom to top by washing Benzene column packing layer, the circulating washing oil counter current contacting with tower top spray, the benzene in coal gas is absorbed by circulating washing oil, then catching by tower Left after mist section removing droplet and wash benzene column, the coal gas part washed after benzene is used for coke oven, tube furnace and boiler heating, and it is besides energized Source power plants generating electricity；Xian's oil for absorbing benzene hydrocarbon delivers to crude benzol Distallation systm；

（2）De- benzene：Using diamond heating method, that is, the washing oil for absorbing benzene hydrocarbon changes through oil gas heat exchanger, poor oil-rich heat exchanger After heat, then enter debenzolizing tower after diamond heating, herein with regenerator come superheated steam directly stripped and distilled, slightly Benzene vapour is escaped from debenzolizing tower top, and the washing oil after de- benzene is delivered to after poor oil-rich heat exchanger heat exchange cooling to be washed benzene system circulation and make With thering is during this part cooling water to carry out secondary use (not being contaminated) as net waste water, tube furnace burns in the process Coal gas produces waste gas；

（3）Crude benzol is fractionated：Enter oil gas heat exchanger, crude benzol condensate cooler, gained crude benzol warp from the oil gas of debenzolizing tower top effusion After oil water separator separation water, into backflash, with backflow pumped back debenzolizing tower top, used as backflow, unnecessary crude benzol enters slightly Benzene medial launder, the crude benzol storage tank of oil depot is periodically sent to crude benzol product pump, the naphtalene oil drawn from debenzolizing tower side line, from inflow Residual oil Groove, with tar storage tank is pumped to, caused separation water is discharged into water emptying groove through control separator in the process, then is sent to suction Gas piping, in the process gaseous contaminant caused by each storage tank and separator through each groove exhaust stack concentrate connection after through pressure Force balancing system inhales gas piping before leading to condensation air blast workshop section air blower, and also part indirect cooling water is as net during this Waste water carries out secondary use (not being contaminated)；

（4）Regenerating wash oil：Using wet type deslagging, in order to ensure the quality of circulating washing oil, from the rich oil pipeline after diamond heating The rich oil for drawing 1~1.5% enters regenerator, and directly carrying out steaming with the superheated steam through diamond heating in this blows, and device top row goes out Steam, washing oil vapour enter debenzolizing tower together with crude benzol vapour, the residues of regenerator bottoms is discharged into residue groove, then with being pumped to tar Groove.

In summary, the beneficial effects of the invention are as follows：The benzene that the PROCESS FOR TREATMENT contains so that its content is reduced to setting Safety value, people's use is safer, and the pollution for environment is small, ensures health, solves existing process to these benzene Processing it is not thorough, cause coal gas using when impurity be present, produce many harmful substances, seriously pollute environment, to people's body The problem of damaging.

Embodiment

With reference to embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to This.

Embodiment：

The technique for based on coal gas in raising coal elute benzene efficiency, comprises the following steps：

（1）Wash benzene：Coal gas from ammonium sulfate workshop section, enter tower from washing benzene column bottom after final cooling tower cools down, from bottom to top by washing Benzene column packing layer, the circulating washing oil counter current contacting with tower top spray, the benzene in coal gas is absorbed by circulating washing oil, then catching by tower Left after mist section removing droplet and wash benzene column, the coal gas part washed after benzene is used for coke oven, tube furnace and boiler heating, and it is besides energized Source power plants generating electricity；Xian's oil for absorbing benzene hydrocarbon delivers to crude benzol Distallation systm；

（2）De- benzene：Using diamond heating method, that is, the washing oil for absorbing benzene hydrocarbon changes through oil gas heat exchanger, poor oil-rich heat exchanger After heat, then enter debenzolizing tower after diamond heating, herein with regenerator come superheated steam directly stripped and distilled, slightly Benzene vapour is escaped from debenzolizing tower top, and the washing oil after de- benzene is delivered to after poor oil-rich heat exchanger heat exchange cooling to be washed benzene system circulation and make With thering is during this part cooling water to carry out secondary use (not being contaminated) as net waste water, tube furnace burns in the process Coal gas produces waste gas；

（3）Crude benzol is fractionated：Enter oil gas heat exchanger, crude benzol condensate cooler, gained crude benzol warp from the oil gas of debenzolizing tower top effusion After oil water separator separation water, into backflash, with backflow pumped back debenzolizing tower top, used as backflow, unnecessary crude benzol enters slightly Benzene medial launder, the crude benzol storage tank of oil depot is periodically sent to crude benzol product pump, the naphtalene oil drawn from debenzolizing tower side line, from inflow Residual oil Groove, with tar storage tank is pumped to, caused separation water is discharged into water emptying groove through control separator in the process, then is sent to suction Gas piping, in the process gaseous contaminant caused by each storage tank and separator through each groove exhaust stack concentrate connection after through pressure Force balancing system inhales gas piping before leading to condensation air blast workshop section air blower, and also part indirect cooling water is as net during this Waste water carries out secondary use (not being contaminated)；

（4）Regenerating wash oil：Using wet type deslagging, in order to ensure the quality of circulating washing oil, from the rich oil pipeline after diamond heating The rich oil for drawing 1~1.5% enters regenerator, and directly carrying out steaming with the superheated steam through diamond heating in this blows, and device top row goes out Steam, washing oil vapour enter debenzolizing tower together with crude benzol vapour, the residues of regenerator bottoms is discharged into residue groove, then with being pumped to tar Groove.

The benzene that the PROCESS FOR TREATMENT contains so that its content is reduced to the safety value of setting, and people's use is safer, for The pollution of environment is small, ensure health, solve existing process to these benzene processing it is not thorough, cause coal gas to exist when using Impurity, many harmful substances are produced, seriously pollute environment, the problem of being damaged to people's body.

It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to Any simply modification, the equivalent variations substantially made according to the technology of the present invention, method to above example, each fall within the present invention Protection domain within.

Claims (1)

1. the technique for carrying out eluting benzene efficiency based on coal gas in raising coal, it is characterised in that comprise the following steps：

（1）Wash benzene：Coal gas from ammonium sulfate workshop section, enter tower from washing benzene column bottom after final cooling tower cools down, from bottom to top by washing Benzene column packing layer, the circulating washing oil counter current contacting with tower top spray, the benzene in coal gas is absorbed by circulating washing oil, then catching by tower Left after mist section removing droplet and wash benzene column, the coal gas part washed after benzene is used for coke oven, tube furnace and boiler heating, and it is besides energized Source power plants generating electricity；Absorb Xian's oil of benzene hydrocarbon（Rich oil）Deliver to crude benzol Distallation systm；

（2）De- benzene：Using diamond heating method, that is, absorb the washing oil of benzene hydrocarbon（Rich oil）Changed through oil gas heat exchanger, lean and fat oil After the heat exchange of hot device, then enter debenzolizing tower after diamond heating, the superheated steam come herein with regenerator directly carry out stripping with Distillation, crude benzene vapor escape from debenzolizing tower top, take off the washing oil after benzene（It is oil-poor）Deliver to and wash after poor oil-rich heat exchanger heat exchange cooling Benzene series system recycles, and has during this part cooling water to carry out secondary use (not being contaminated) as net waste water, in this process Middle tube furnace burning coal gas produces waste gas；

（3）Crude benzol is fractionated：Enter oil gas heat exchanger, crude benzol condensate cooler, gained crude benzol warp from the oil gas of debenzolizing tower top effusion After oil water separator separation water, into backflash, with backflow pumped back debenzolizing tower top, used as backflow, unnecessary crude benzol enters slightly Benzene medial launder, the crude benzol storage tank of oil depot is periodically sent to crude benzol product pump, the naphtalene oil drawn from debenzolizing tower side line, from inflow Residual oil Groove, with tar storage tank is pumped to, caused separation water is discharged into water emptying groove through control separator in the process, then is sent to suction Gas piping, in the process gaseous contaminant caused by each storage tank and separator through each groove exhaust stack concentrate connection after through pressure Force balancing system inhales gas piping before leading to condensation air blast workshop section air blower, and also part indirect cooling water is as net during this Waste water carries out secondary use (not being contaminated)；

（4）Regenerating wash oil：Using wet type deslagging, in order to ensure the quality of circulating washing oil, from the rich oil pipeline after diamond heating The rich oil for drawing 1~1.5% enters regenerator, and directly carrying out steaming with the superheated steam through diamond heating in this blows, and device top row goes out Steam, washing oil vapour enter debenzolizing tower together with crude benzol vapour, the residues of regenerator bottoms is discharged into residue groove, then with being pumped to tar Groove.