CN204490830U - Utilize the system of raw gas waste heat recovery coal oven dithio-gas benzene class material - Google Patents
Utilize the system of raw gas waste heat recovery coal oven dithio-gas benzene class material Download PDFInfo
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- CN204490830U CN204490830U CN201520181734.4U CN201520181734U CN204490830U CN 204490830 U CN204490830 U CN 204490830U CN 201520181734 U CN201520181734 U CN 201520181734U CN 204490830 U CN204490830 U CN 204490830U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model discloses the device utilizing raw gas waste heat recovery Benzene class material, comprise gas-liquid separator, gas-liquid separator and coal oven dithio-gas pipeline, tar ammonia water separator connects, tar ammonia water separator and tar pump, cyclic ammonia water pump connects, gas-liquid separator is connected with heat pump set, heat pump set and gas cooler, cleaning oil pump connects, heat pump set and poor oil-rich heat exchanger, oil-poor groove, raw gas washing tower connects, poor oil-rich heat exchanger and oil gas heat exchanger, vacuum distillation tower, light benzene water cooler connects, oil gas heat exchanger and rich oil pump liquid outlet, raw gas wash tower bottoms connects, heat pump set and vacuum distillation tower, the oil-poor pump fluid inlet of heat, poor oil-rich heat exchanger connects, vacuum distillation tower and naphtalene oil groove, heavy benzol groove connects, light benzene water cooler and return tank, condenser water cooler does not connect, condenser water cooler is not connected with vacuum pump, return tank and reflux pump, separation water tank connects, reflux pump and vacuum distillation tower, crude benzol groove connects.
Description
Technical field
The utility model relates to waste heat of coke oven crude gas recovery technology field, particularly relates to a kind ofly to be widely used in the system that coking industry utilizes raw gas waste heat recovery coal oven dithio-gas benzene class material.
Background technology
In coking production, coal oven dithio-gas purification and change Product recycling Technology, coking coal finally forms coke at coking chamber, gives off the coke-oven gas being rich in the many kinds of substances such as tar gas, benzene class material, naphthalene, namely what is often called raw gas; Coal gas after Recovery Purifying chemical products wherein, is called firing tunnel in coking furnace or purified gas.First the 650-750 DEG C of raw gas that coke furnace carbonization chamber is overflowed through upcast be down to 80-90 DEG C through cyclic ammonia water spray temperature in bridge tube and effuser; Then flow to coal gas primary cooler by effuser along inhaling coal gas supervisor, different according to gas pipeline situation, raw gas is at the cooling of coal gas in course of conveying 2-5 DEG C; In order to cool raw gas further and separate out its condensing water vapor, tarry vapours etc., to reduce coal gas volume, being convenient to conveying, and saving conveying coal gas required drive, is generally utilize process cooling water that raw gas is cooled to 23-25 DEG C in primary cooler.As shown in Figure 1, the preliminary type of cooling of raw gas adopts transverse tube indirectly to cool mostly, primary cooler is generally divided into epimere, stage casing, hypomere three part, warm water quench during upper, stage casing adopts, hypomere subcooling water cooling, the raw gas of 85 DEG C is followed successively by 73 DEG C, 45 DEG C, 24 DEG C by the temperature after primary cooler upper, middle and lower segment interchanger from top to bottom successively.If only consider the heat that raw gas is pulled away in upper, the stage casing of primary cooler, the amount of raw gas is with 5.5 × 10
4m3/h counts, and raw gas is reduced to 45 DEG C from 85 DEG C, then can discharge about 2.40 × 10
7kilocalorie energy.If with technical cooling water cooling raw gas, then this partial heat is wasted on the one hand, also will consume the process cooling water of equivalent amount cold on the other hand.
Meanwhile, each coal chemical enterprise is in order to purify raw gas and reclaim benzene class material in raw gas, general employing liquid scrubbing absorption process and rich oil distillation and separation method, namely use benzene hydrocarbon in washing oil washing absorption raw gas, make it to become the rich oil being rich in benzene hydrocarbon in raw gas washing tower; Then sent by rich oil vacuum distillation tower to carry out fractionation by distillation and go out benzene hydrocarbon class material wherein.As shown in Figure 2, the rich oil that Xi Ben workshop section sends here heats up through vacuum distillation tower workshop section poor oil-rich heat exchanger, tube furnace successively, rich oil after heating enters vacuum distillation and takes off benzene distillation and be separated wherein benzene class material, and namely the washing oil removing benzene class material becomes the oil-poor raw gas washing tower that send and recycle; The tube furnace of heating rich oil adopts coal gas to be fuel.
On the one hand, raw gas except the heat carried is wasted, also needs to consume a large amount of process cooling waters in process of cooling, adds system energy consumption and water consumption, reduces energy utilization rate; On the other hand, it is fuel heating rich oil that coke-oven gas reclaims a large amount of coal gas of benzene class material demand consumption, adds system energy consumption.
Utility model content
The purpose of this utility model is exactly the problems referred to above existed for solving prior art, provides a kind of system utilizing raw gas waste heat recovery coal oven dithio-gas benzene class material; The technology utilizing raw gas waste heat recovery Benzene class material of the utility model research, by upper, the stage casing and the benzene steaming tower workshop section tube furnace that adopt two class heat pump set to substitute existing raw gas primary cooler, cool coal oven dithio-gas, raw gas waste heat is utilized to drive heat pump rich oil, rich oil after heat temperature raising directly enters vacuum distillation column distillation and isolates benzene class material wherein, reduce process cooling water system energy consumption, water consumption, save the tube furnace running cost of rich oil Distallation systm.
The technical scheme of the utility model technical solution problem is:
A kind of device utilizing raw gas waste heat recovery Benzene class material, comprise gas-liquid separator, heat pump set, vacuum distillation tower, gas-liquid separator is connected with coal oven dithio-gas pipeline by gas blower, described gas-liquid separator is connected with tar ammonia water separator, tar ammonia water separator is connected with tar pump and cyclic ammonia water pump fluid inlet respectively, cyclic ammonia water pumps liquid pipeline and is sprayed onto in bridge tube and effuser by cyclic ammonia water and is cooled to 80-90 ° to raw gas, coal tar is sent outside by pipeline, described gas-liquid separator is connected with heat pump set by raw coke oven gas pipeline, described heat pump set is connected with gas cooler, raw gas in gas cooler is sent outside by pipeline, heat pump set is connected with wash oil pump liquid outlet, the fluid inlet of cleaning oil pump is connected with cleaning oil groove, heat pump set is connected with poor oil-rich heat exchanger by pipeline, poor oil-rich heat exchanger is connected with oil-poor groove, oil-poor groove is connected by the top of cold oil-poor pump and raw gas washing tower and middle part, poor oil-rich heat exchanger is connected with oil gas heat exchanger, described oil gas heat exchanger respectively with vacuum distillation tower top, light benzene water cooler connects, described oil gas heat exchanger is connected with rich oil pump liquid outlet by washing benzene saturated oil tube, rich oil pump fluid inlet is connected with raw gas wash tower bottoms, raw gas after washing is discharged from the pipeline at raw gas washing tower top, heat pump set is connected with vacuum distillation tower top by pipeline, vacuum distillation tower bottom is connected with the oil-poor pump fluid inlet of heat, the oil-poor pump liquid outlet of heat is connected with poor oil-rich heat exchanger, the middle and lower part of described vacuum distillation tower is connected with naphtalene oil groove by pipeline, middle part is connected with heavy benzol groove by pipeline, described light benzene water cooler is connected with return tank, the top of return tank and not condenser water cooler are bi-directionally connected, described not condenser water cooler is connected with vacuum pump, by vacuum pump, non-condensable gas is transported to raw gas system pipeline, the bottom of return tank is connected with reflux pump fluid inlet, the liquid outlet of reflux pump is connected with vacuum distillation tower top, the bottom of return tank is connected with separation water tank simultaneously, the liquid outlet of reflux pump is connected with crude benzol groove simultaneously, described crude benzol groove is connected with crude benzol discharge pump, crude benzol finished product is stored by Cemented filling.
Have additional Fouling Cleaning device at the vaporizer of heat pump set and producer part, under wash oil pumping action, utilize the lightweight washing oil mainly consisting of benzene class material, hot ammoniacal liquor etc. regularly to clean the vaporizer of heat pump set and producer part and raw gas side.
The vaporizer of described heat pump set is connected with coal oven dithio-gas respectively with one end of producer, resorber is connected with rich oil medium, condenser is connected with recirculated water, in vaporizer, cryogen is transported to vaporizer by cryogenic fluid pump, cryogen absorbs the heat of raw gas in heat-transfer pipe and evaporates, low-pressure steam partial coagulation is made to become liquid to discharge unit, in resorber, by spray to the absorbent solution on resorber heat-transfer pipe, absorb the refrigerant vapour produced by vaporizer, the absorption heat produced when absorbing cryogen makes the rich oil of Bottomhole pressure heat up; After absorbing refrigerant vapour, absorption liquid and the dilute solution of density loss send into producer by solution pump through solution heat exchanger; In producer, the dilute solution returned by resorber, by spray in producer tube surface, dilute solution is heated by the coal oven dithio-gas in heat-transfer pipe; Produced refrigerant vapour by the dilute solution heated, become the higher absorption liquid of concentration and strong solution, be sent back to resorber by solution heat exchanger; In condenser, at the refrigerant vapour that producer produces, the water quench of the device that is condensed heat transfer Bottomhole pressure, is turned into cryogen liquid, is delivered to vaporizer by cryogenic fluid pump after condensation, and the recovery and the rich oil that realize waste heat of coke oven crude gas heat up.
The beneficial effects of the utility model:
The utility model utilizes the system of raw gas waste heat recovery Benzene class material, be specially adapted to coking industry, this apparatus system utilizes two class heat pumps replacement primary cooler epimeres, stage casing cools raw gas, reclaim the rich oil that raw gas waste heat heats raw gas benzene class material recovery process, gas saving, steam and middle temperature cooling-water consumption, can reduce facility investment and the working cost of warm water coolant part in rich oil distillation, primary cooler greatly; In addition heat pump reclaims heat heating rich oil medium, does not produce waste water, has good economic benefit, social benefit and environmental benefit.
Recycle the rich oil medium of the containing benezene material that coal oven dithio-gas heat heating raw gas washing tower comes, after being entered vacuum distillation tower by the rich oil circulatory mediator heated, fractionation by distillation goes out benzene class material wherein, achieves the recycling of coal oven dithio-gas heat.
Replace original primary cooler epimere and stage casing with heat pump, by heat pump set, raw gas heat is passed to rich oil medium, reduce middle warm water consumption, thus reduce water consumption.
Replace the diamond heating rich oil of former rich oil distillation process with heat pump, reduce system operation cost and gas consumption.
The diamond heating rich oil of former rich oil distillation process is replaced with heat pump, can link washing oil high temperature deterioration degree greatly, improve raw gas washing effect, reduce system oil washing consumption.
Cool raw gas with heat pump replacement primary cooler epimere, stage casing, facility investment and the running cost of raw gas cooling can be reduced.
This apparatus system to newly-built system and legacy system all applicable, only need transform a little existing equipment, do not affect main equipment, improvement expenses is low, has good economic benefit and social benefit.
8. be provided with Fouling Cleaning device at the vaporizer of heat pump set and producer part; under wash oil pumping action, utilize the lightweight washing oil mainly consisting of benzene class material, hot ammoniacal liquor etc. regularly to clean the vaporizer of heat pump set and producer part and raw gas side, guarantee heat exchange efficiency.
Accompanying drawing explanation
Fig. 1 is the former raw gas primary cooler cooling process figure of prior art;
Fig. 2 is benzene class matter detergent and vacuum distillation process flow sheet in the former raw gas of prior art;
Fig. 3 is the system flowchart of raw gas waste heat recovery Benzene class material of the present utility model;
Fig. 4 is the fundamental diagram of heat pump of the present utility model.
Embodiment
In order to understand the utility model better, explain embodiment of the present utility model in detail below in conjunction with accompanying drawing.
As Fig. 3, shown in 4, a kind of device utilizing raw gas waste heat recovery Benzene class material, comprise gas-liquid separator 1, heat pump set 2, vacuum distillation tower 10, gas-liquid separator 1 is connected with coal oven dithio-gas pipeline by gas blower, described gas-liquid separator 1 is connected with tar ammonia water separator 24, tar ammonia water separator 24 is connected with tar pump 25 and cyclic ammonia water pump 26 fluid inlet respectively, cyclic ammonia water is sprayed onto in bridge tube and effuser and is cooled to 80-90 ° to raw gas by cyclic ammonia water pump 26 fluid pipeline, coal tar is sent outside by pipeline 27, described gas-liquid separator 1 is connected with heat pump set 2 by raw coke oven gas pipeline, described heat pump set 2 is connected with gas cooler 3, raw gas in gas cooler 3 is sent outside by pipeline 28, heat pump set 2 is connected with cleaning oil pump 6 liquid outlet, the fluid inlet of cleaning oil pump 6 is connected with cleaning oil groove 7, heat pump set 2 is connected with poor oil-rich heat exchanger 8 by pipeline, poor oil-rich heat exchanger 8 is connected with oil-poor groove 23, oil-poor groove 23 is connected by the top of cold oil-poor pump 22 and raw gas washing tower 4 and middle part, poor oil-rich heat exchanger 8 is connected with oil gas heat exchanger 9, described oil gas heat exchanger 9 respectively with vacuum distillation tower 10 top, light benzene water cooler 16 connects, described oil gas heat exchanger 9 is connected with rich oil pump 5 liquid outlet by washing benzene saturated oil tube 32, rich oil pump fluid inlet is connected with bottom raw gas washing tower 4, raw gas after washing is discharged from the pipeline 31 at raw gas washing tower 4 top.Heat pump set 2 is connected with vacuum distillation tower 10 top by pipeline, bottom vacuum distillation tower 10, pump 21 fluid inlet oil-poor with heat is connected, oil-poor pump 21 liquid outlet of heat is connected with poor oil-rich heat exchanger 8, the middle and lower part of described vacuum distillation tower 10 is connected with naphtalene oil groove 11 by pipeline, middle part is connected with heavy benzol groove 12 by pipeline, described light benzene water cooler 16 is connected with return tank 17, the top of return tank 17 and not condenser water cooler 19 are bi-directionally connected, described not condenser water cooler 19 is connected with vacuum pump 20, by vacuum pump 20, non-condensable gas is transported to raw gas system pipeline 33.The bottom of return tank 17 is connected with reflux pump 15 fluid inlet, the liquid outlet of reflux pump is connected with vacuum distillation tower 10 top, the bottom of return tank 17 is connected with separation water tank 18 simultaneously, the liquid outlet of reflux pump is connected with crude benzol groove 13 simultaneously, and described crude benzol groove 13 is connected with crude benzol discharge pump 14, crude benzol finished product is carried storage by pipeline 34.
Principle of work of the present utility model and working process:
The utility model by gas blower by coal oven dithio-gas by Cemented filling to gas-liquid separator 1, liquid phase wherein enters tar ammonia water separator 24 and carries out oily water separation, about 85 DEG C raw gas enter heat pump set 2, by heat pump set heating through oil gas heat exchanger 9, the rich oil that poor oil-rich heat exchanger 8 heat exchange heats up, after heating, high temperature rich oil directly sends into vacuum distillation tower 10, fractionation by distillation benzene class material wherein, rich oil vacuum distillation tower 10 part is not except original tube furnace re-uses, other are identical with original operation scheme, through vacuum distillation tower, to remove after benzene class material oil-poor enters oil-poor groove 23, then deliver to raw gas washing tower 4 by cold oil-poor pump 22 to recycle, raw gas temperature after heat pump set 2 heat exchange cooling is reduced to about 55 DEG C, temperature is reduced to about 55 DEG C, the raw gas of about 55 DEG C enters gas cooler 3 again, after being cooled to 23-25 DEG C, enters postorder gas purification productive unit with the heat exchange of water at low temperature water coolant.
Because the foreign matter contents such as water vapor, tar gas, naphthalene, coal dust in raw gas are more; in order to remove naphthalene, the coal tar wet goods dirt of heat pump set raw gas side deposition better; Fouling Cleaning device is had additional at the vaporizer of heat pump set 2 and producer part; under cleaning oil pump 6 acts on, utilize the lightweight washing oil mainly consisting of benzene class material, hot ammoniacal liquor etc. regularly to clean the vaporizer of heat pump set and producer part and raw gas side, guarantee heat exchange efficiency.
Described heat pump set is a kind of common heat-energy recovering apparatus, utilizes raw gas as thermal source, in resorber, rich oil is heated to comparatively high temps.In unit with cryogen and absorption agent for carrier, realize the energy transformation between waste heat and circulatory mediator.Unit vaporizer is connected with coal oven dithio-gas respectively with one end of producer, and resorber is connected with rich oil medium, and condenser is connected with recirculated water.Its principle is: in vaporizer, by cryogenic fluid pump, cryogen is transported to vaporizer, and cryogen absorbs the heat of raw gas in heat-transfer pipe and evaporates, and makes low-pressure steam partial coagulation become liquid to discharge unit.
In resorber, by spray to the absorbent solution on resorber heat-transfer pipe, absorb the refrigerant vapour produced by vaporizer, the absorption heat produced when absorbing cryogen makes the rich oil of Bottomhole pressure heat up.After absorbing refrigerant vapour, absorption liquid and the dilute solution of density loss send into producer by solution pump through solution heat exchanger.
In producer, the dilute solution returned by resorber, by spray in producer tube surface, dilute solution is heated by the coal oven dithio-gas in heat-transfer pipe.Produced refrigerant vapour by the dilute solution heated, become the higher absorption liquid of concentration and strong solution, be sent back to resorber by solution heat exchanger.
In condenser, at the refrigerant vapour that producer produces, the water quench of the device that is condensed heat transfer Bottomhole pressure, is turned into cryogen liquid, is delivered to vaporizer by cryogenic fluid pump after condensation.Through such process, the recovery and the rich oil that realize waste heat of coke oven crude gas heat up.
By reference to the accompanying drawings the embodiment of utility model is described although above-mentioned; but the restriction not to the utility model protection domain; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (3)
1. one kind utilizes the device of raw gas waste heat recovery Benzene class material, it is characterized in that, comprise gas-liquid separator, heat pump set, vacuum distillation tower, gas-liquid separator is connected with coal oven dithio-gas pipeline by gas blower, described gas-liquid separator is connected with tar ammonia water separator, tar ammonia water separator is connected with tar pump and cyclic ammonia water pump fluid inlet respectively, cyclic ammonia water pumps liquid pipeline and is sprayed onto in bridge tube and effuser by cyclic ammonia water and is cooled to 80-90 ° to raw gas, coal tar is sent outside by pipeline, described gas-liquid separator is connected with heat pump set by raw coke oven gas pipeline, described heat pump set is connected with gas cooler, raw gas in gas cooler is sent outside by pipeline, heat pump set is connected with wash oil pump liquid outlet, the fluid inlet of cleaning oil pump is connected with cleaning oil groove, heat pump set is connected with poor oil-rich heat exchanger by pipeline, poor oil-rich heat exchanger is connected with oil-poor groove, oil-poor groove is connected by the top of cold oil-poor pump and raw gas washing tower and middle part, poor oil-rich heat exchanger is connected with oil gas heat exchanger, described oil gas heat exchanger respectively with vacuum distillation tower top, light benzene water cooler connects, described oil gas heat exchanger is connected with rich oil pump liquid outlet by washing benzene saturated oil tube, rich oil pump fluid inlet is connected with raw gas wash tower bottoms, raw gas after washing is discharged from the pipeline at raw gas washing tower top, heat pump set is connected with vacuum distillation tower top by pipeline, vacuum distillation tower bottom is connected with the oil-poor pump fluid inlet of heat, the oil-poor pump liquid outlet of heat is connected with poor oil-rich heat exchanger, the middle and lower part of described vacuum distillation tower is connected with naphtalene oil groove by pipeline, middle part is connected with heavy benzol groove by pipeline, described light benzene water cooler is connected with return tank, the top of return tank and not condenser water cooler are bi-directionally connected, described not condenser water cooler is connected with vacuum pump, by vacuum pump, non-condensable gas is transported to raw gas system pipeline, the bottom of return tank is connected with reflux pump fluid inlet, the liquid outlet of reflux pump is connected with vacuum distillation tower top, the bottom of return tank is connected with separation water tank simultaneously, the liquid outlet of reflux pump is connected with crude benzol groove simultaneously, described crude benzol groove is connected with crude benzol discharge pump, crude benzol finished product is stored by Cemented filling.
2. utilize the device of raw gas waste heat recovery Benzene class material as claimed in claim 1, it is characterized in that, have additional Fouling Cleaning device at the vaporizer of heat pump set and producer part, under wash oil pumping action, utilize the lightweight washing oil mainly consisting of benzene class material, hot ammoniacal liquor etc. regularly to clean the vaporizer of heat pump set and producer part and raw gas side.
3. utilize the device of raw gas waste heat recovery Benzene class material as claimed in claim 1, it is characterized in that, the vaporizer of described heat pump set is connected with coal oven dithio-gas respectively with one end of producer, resorber is connected with rich oil medium, condenser is connected with recirculated water, in vaporizer, cryogen is transported to vaporizer by cryogenic fluid pump, cryogen absorbs the heat of raw gas in heat-transfer pipe and evaporates, low-pressure steam partial coagulation is made to become liquid to discharge unit, in resorber, by spray to the absorbent solution on resorber heat-transfer pipe, absorb the refrigerant vapour produced by vaporizer, the absorption heat produced when absorbing cryogen makes the rich oil of Bottomhole pressure heat up, after absorbing refrigerant vapour, absorption liquid and the dilute solution of density loss send into producer by solution pump through solution heat exchanger, in producer, the dilute solution returned by resorber, by spray in producer tube surface, dilute solution is heated by the coal oven dithio-gas in heat-transfer pipe, produced refrigerant vapour by the dilute solution heated, become the higher absorption liquid of concentration and strong solution, be sent back to resorber by solution heat exchanger, in condenser, at the refrigerant vapour that producer produces, the water quench of the device that is condensed heat transfer Bottomhole pressure, is turned into cryogen liquid, is delivered to vaporizer by cryogenic fluid pump after condensation, and the recovery and the rich oil that realize waste heat of coke oven crude gas heat up.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520181734.4U CN204490830U (en) | 2015-03-27 | 2015-03-27 | Utilize the system of raw gas waste heat recovery coal oven dithio-gas benzene class material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520181734.4U CN204490830U (en) | 2015-03-27 | 2015-03-27 | Utilize the system of raw gas waste heat recovery coal oven dithio-gas benzene class material |
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| CN204490830U true CN204490830U (en) | 2015-07-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789273A (en) * | 2015-03-27 | 2015-07-22 | 山东钢铁股份有限公司 | System for recycling coke oven raw-gas benzene substances by using raw-gas waste heat |
| CN111217664A (en) * | 2019-07-30 | 2020-06-02 | 杨承诣 | Device for heating rich oil and distilling crude benzene by using waste heat of raw gas and producing crude benzene by negative pressure |
| RU2815986C1 (en) * | 2023-10-11 | 2024-03-25 | Андрей Владимирович Рожнев | Coke oven gas cleaning method |
-
2015
- 2015-03-27 CN CN201520181734.4U patent/CN204490830U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789273A (en) * | 2015-03-27 | 2015-07-22 | 山东钢铁股份有限公司 | System for recycling coke oven raw-gas benzene substances by using raw-gas waste heat |
| CN111217664A (en) * | 2019-07-30 | 2020-06-02 | 杨承诣 | Device for heating rich oil and distilling crude benzene by using waste heat of raw gas and producing crude benzene by negative pressure |
| RU2815986C1 (en) * | 2023-10-11 | 2024-03-25 | Андрей Владимирович Рожнев | Coke oven gas cleaning method |
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Granted publication date: 20150722 Termination date: 20190327 |