CN104910940A - Classified recovery method for high-temperature oil gas in oil shale retorting - Google Patents
Classified recovery method for high-temperature oil gas in oil shale retorting Download PDFInfo
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Abstract
The invention belongs to the field of shale oil processing technology and particularly relates to a classified recovery method for high-temperature oil gas in oil shale retorting. The method sequentially comprises the following steps: (a) washing the retorting gas in a heavy oil washing tower (1), performing heat exchange of the heavy oil flowing out of the tower bottom by a first heat exchanger (14), and feeding into a mud collection tank and a finished product recovery system; and performing gravity separation on oil sludge in the mud collection tank, and feeding the upper-layer heavy oil to the tower top of the heavy oil washing tower (1) for circular washing; and (b) transferring the retorting gas from the tower top of the heavy oil washing tower (1) to the tower bottom of a diesel oil washing tower (2) for washing; performing heat exchange of the heavy diesel oil flowing out of the tower bottom of the diesel oil washing tower (2) by a second heat exchanger (15), and feeding into the mud collection tank and the finished product recovery system; and performing gravity separation on oil sludge in the mud collection tank, and feeding the upper-layer heavy diesel oil to the tower top of the diesel oil washing tower (2) for circular washing. By adopting the method provided by the invention, the shale oil loss can be effectively reduced, the oil recovery rate is increased, crude separation is realized in the oil recovery stage, and energy consumption and environmental pollution are reduced.
Description
Technical field
The invention belongs to shale oil processing technical field, particularly relate to a kind of oil shale distillation classification and reclaim high-temperature oil gas method.
Background technology
At present, resinous shale obtains high-temperature oil gas by low-temperature pyrolysis, after reclaiming, obtain the important substitute shale oil of oil.Domestic existing dry distillation recovery technology is water wash system, namely the carbonizing gas of shale oil, water and dry distillation gas is comprised after gas retort outlet derivation, respectively in collecting tubule, washing tower, cooling tower, directly contact with carbonizing gas with recirculated water and carry out cooling and wash, thus define washing process system.The shortcoming of above-mentioned operational path is that energy consumption is large, and quantity of circulating water is large, and the wastewater flow rate of generation is large.
The water wash system of domestic contrast advanced person, as application number: 200810010311.0, title: oil shale retorting process reclaiming method and application number: 200910187607.4, title: oil shale dry distillation recovery technology; Above-mentioned two patents adopt tertiary effluent to wash and level Four washing process respectively, and feature is increased to 80% by original 70%.Two, tertiary effluent washes the saturated washing tower of the gas adopted in system and air saturation washing tower be top is saturated section, bottom is the structure of washing section, namely after first air humidification being heated, the washing water that temperature slightly declines enter washing section washing carbonizing gas again, while raising washing, cooling efficiency and air saturation purity, decrease the oil mass entered in saturated air, reduce oil to damage, improve Oil Recovery rate.But above-mentioned operational path is energy-conservation, the limited use of cycling use of water amount and waste water output aspect.Because as the water of main washing medium, in washing is reclaimed, mainly there are the following problems.
1, process high temperature carbonization gas and waste great high temperature heat.When carbonization gas is high temperature, directly adopt WATER-WASHING METHOD washing, water vapour difficulty increase on pressure operation of flash evapn is very large.
2, the process of refiltered oil has directly been washed by water, often overlaps destructive distillation device and produces retort sewage, can increase the Processing tecchnics cost of sewage.
3, water wash system uses recirculated water, and the recycle system is huge, and power consumption is large.In system, pump, groove and tank are more, and the adjustment of liquid level all need by manually carrying out, and level of automation is low.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art part and provides one effectively can reduce shale oil loss, improve Oil Recovery rate, the roughing out of Oil Recovery stage, reduce energy consumption, reduce circulating sewage amount and quantity of wastewater effluent, high-temperature oil gas method is reclaimed in the oil shale distillation classification reducing environmental pollution.
For solving the problems of the technologies described above, the present invention realizes like this.
High-temperature oil gas method is reclaimed in oil shale distillation classification, can carry out successively as follows:
A, carbonization gas enter the washing of heavy oil washing tower, go out heavy oil after First Heat Exchanger heat exchange from tower bottom flow, send into collection mud tank and finished product recovery system; In collection mud tank, gravity separation goes out greasy filth, and upper strata heavy oil is sent into heavy oil washing tower tower top again and carried out circulation cleaning.
B, the carbonization gas sent from heavy oil washing tower tower top reach at the bottom of diesel oil washing tower tower and wash; The heavy gas oil that diesel oil washing tower tower bottom flow goes out sends into collection mud tank and finished product recovery system after the second interchanger heat exchange; In collection mud tank, gravity separation goes out greasy filth, and upper strata heavy gas oil is sent into diesel oil washing tower tower top again and carried out circulation cleaning.
As a kind of preferred version, after completing steps b of the present invention, the carbonization gas sent from diesel oil washing tower tower top enters indirect cool tower and water wash column successively; The oil product produced in indirect cool tower process of cooling flows out indirect cool tower by the mode of overflow and is collected to finished product recovery system; The washing water that water wash column tower bottom flow goes out are after stratification, and shale oil enters processed oil recovery system; Washing water enter in air flotation pool and reclaim contained oil in water emulsion; The oil product that water wash column tower top flows out enters electric fishing tower; Electric fishing tower traps contained lightweight oil, is delivered to coal mine gas dispense station after the carbonizing gas that electric fishing tower exports is pressurizeed by gas air draft gas.
Further, the present invention adopts recirculated cooling water to do refrigerant to carry out adverse current cooling to the coal mine gas in indirect cool tower.
Further, in step a of the present invention, the temperature of carbonization gas is 490 ~ 510 DEG C.
Further, the present invention is provided with oxygen on line analyzer between indirect cool tower and water wash column, is set in electric fishing tower operational envelope by the content of oxygen in carbonizing gas.
Recovery process of the present invention substitutes traditional washing process with oil wash, compared with prior art has following features.
1, oil wash is adopted the heat energy of high temperature carbonization gas can be recycled to greatest extent, the oil of part wherein and lightweight oil can be recovered efficiently, improve the rate of recovery of shale oil, the technique of fractionation is carried out again after improving traditional washing, utilize in the feature removal process of oil wash and carry out rough segmentation, decrease the loss of material such as recirculated water, add economic benefit.
2, the basic structure that cooling and saturated gas water washing and electric fishing oil are washing and recycling after secondary oil wash is adopted in oil wash system, namely first secondary oil wash is carried out to high temperature carbonization gas, the carbonization gas that temperature slightly declines enters indirect cooling section again, carbonization gas is cooled to wash optimal temperature, carry out water washing again, secondary oil washing is lowered the temperature high temperature carbonization gas respectively at twice, simultaneously heavy constituent in oil gas through first time oil wash section, heavy oil component is washed out, second time oil wash section will comparatively be washed out in last running, decrease the oil mass entering cooling section and saturated gas water washing section, reduce oil loss, improve oil recovery rate.Secondly, because increase high-temperature heat-exchanging and electrostatic catch oily tower, make the high temperature energy of carbonizing gas and oil gas obtain efficient recovery, also serve the effect reducing oil loss, improve oil recovery rate, byproduct water steam is also considerable.
Contrast prior art, tool of the present invention has the following advantages and positively effect.
1, oil recovery rate can be improved 10 ~ 20 percentage points, and then increase economic efficiency.Oil recovery rate can be brought up to 80%-90% by 70% of traditional technology by this kind of recovery system, and comparatively washing process every covering device joint oil-collecting ratio significantly improves.
2, the discharge of pollutent is decreased.
3, because only having the direct water washing process of one-level, and washing water use not outer row at totally-enclosed system internal recycle, and all recovery systems do not have retort sewage to produce, and greatly reduce the cost of process needed for retort sewage.
4, oil gas can be carried out roughing out at recovery stage, heavy oil isolated by heavy oil washing tower, and heavy gas oil cut isolated by diesel oil washing tower, and indirect cool tower isolates diesel oil, and light oil isolated by water wash column and electric fishing oil tower goes out gasoline.
The data such as temperature, liquid level of each tower 5, in recovery system, groove, tank carry out automatic monitoring by DCS system, all realize closed operation, there is not uncontrollable discharge phenomenon in scene, in-situ production environment be improved significantly.
6, adopt DCS Controlling System, become centralized Control from dispersion Non-follow control.In systems in which, when in dry distillation gas, oxygen level exceedes the higher limit of setting, electrostatic catches oily device auto-breaking, improves the level of automation of integrated operation and the safety coefficient of system.
7, the dry distillation gas after purification still incendivity is shale retorting heat supply.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described.Protection scope of the present invention is not only confined to the statement of following content.
Fig. 1 is process flow diagram of the present invention.
In figure: 1, heavy oil washing tower; 2, diesel oil washing tower; 3, indirect cool tower; 4, water wash column; 5, electric fishing tower; 6, gas exhaust blower; 7, coal mine gas dispense station; 8, use side; 9, the first recycle pump; 10, the second recycle pump; 11, oil pump; 12, washing pump; 13, oil pump; 14, First Heat Exchanger; 15, the second interchanger.
Embodiment
As shown in the figure, high-temperature oil gas method is reclaimed in oil shale distillation classification, carries out successively as follows.
A, carbonization gas enter heavy oil washing tower 1 and wash, and go out heavy oil after First Heat Exchanger 14 heat exchange from tower bottom flow, send into collection mud tank and finished product recovery system; In collection mud tank, gravity separation goes out greasy filth, and upper strata heavy oil is sent into heavy oil washing tower 1 tower top again and carried out circulation cleaning.
B, the carbonization gas sent from heavy oil washing tower 1 tower top reach at the bottom of diesel oil washing tower 2 tower and wash; The heavy gas oil that diesel oil washing tower 2 tower bottom flow goes out sends into collection mud tank and finished product recovery system after the second interchanger 15 heat exchange; In collection mud tank, gravity separation goes out greasy filth, and upper strata heavy gas oil is sent into diesel oil washing tower 2 tower top again and carried out circulation cleaning.
After completing steps b of the present invention, the carbonization gas sent from diesel oil washing tower 2 tower top enters indirect cool tower 3 and water wash column 4 successively, and the oil product produced in indirect cool tower 3 process of cooling flows out indirect cool tower by the mode of overflow and is collected to finished product recovery system; The washing water that water wash column 4 tower bottom flow goes out are after stratification, and shale oil enters processed oil recovery system; Washing water enter in air flotation pool and reclaim contained oil in water emulsion; The oil product that water wash column 4 tower top flows out enters electric fishing tower 5; Electric fishing tower 5 traps contained lightweight oil, is delivered to coal mine gas dispense station 7 after the carbonizing gas that electric fishing tower 5 exports is pressurizeed by gas exhaust blower 6.The present invention adopts recirculated cooling water to do refrigerant to carry out adverse current cooling to the coal mine gas in indirect cool tower 3.In step a of the present invention, the temperature of carbonization gas is 490 ~ 510 DEG C.The present invention is provided with oxygen on line analyzer between indirect cool tower 3 and water wash column 4, is set in electric fishing tower 5 operational envelope by the content of oxygen in carbonizing gas.
Shown in Figure 1, from 490 DEG C ~ 510 DEG C carbonizing gas that the destructive distillation stage derives, heavy oil washing tower 1 is entered after dust removal installation, tower interior washing liquid phase component is sent into First Heat Exchanger 14 by the first recycle pump 9 and is carried out water heat exchange to be evaporated, output byproduct water steam, through heat exchange Posterior circle washing oil spray washing, after First Heat Exchanger 14 heat exchange, the heavy oil of 40% contained by it is washed down.Shale oil is brought in greasy filth house steward, and flow to tank field by greasy filth house steward and store, and in tank, oil carries out precipitation greasy filth by gravity.Processed oil system delivered to by the heavy oil on upper strata.
The carbonizing gas of deriving from heavy oil washing tower 1 tower top enters diesel oil washing tower 2 at the bottom of tower, sent into interchanger 15 by the second recycle pump 10 and carried out water heat exchange to be evaporated, output byproduct water steam, through heat exchange Posterior circle washing oil spray washing, after the second interchanger 15 heat exchange, the diesel oil of 45% contained by it is washed down.Diesel oil washing tower 2 can set up stage casing circulation according to feedstock property and inlet amount, and bottom circulation makes washing effect better.Shale oil is brought in collection mud tank, and in tank, oil carries out precipitation greasy filth by gravity.Processed oil system delivered to by the heavy gas oil on upper strata.
After this secondary oil wash, 190 DEG C ~ 210 DEG C carbonization gas enter three grades of indirect cool towers 3, and the high temperature water purification after heat exchange can be used for heating for residential area (winter), air conditioner refrigerating (summer) and generating, supply First Heat Exchanger 14, second interchanger 15 provide water to be evaporated.Connect oil pump 11 diesel oil is sent into processed oil system at the bottom of indirect cool tower tower.
After indirect cool tower, carbonization gas is sent in the saturated water wash column 4 of gas, with the washing water countercurrent flow sent into from tower top in washing section therein, wherein contained oil wash is got off, realize washing, the washing water that tower bottom flow goes out enter in wash trough jointly, in pond, profit carries out layering by proportion difference, and the shale oil on upper strata enters processed oil recovery system.The washing water of lower floor enter in air flotation pool, air supporting principle is utilized to carry out oil, water, the process of greasy filth three phase separation to washing water, and oil in water emulsion is wherein carried out after recovery delivers to processed oil system, send into water wash column 4 internal recycle again by washing pump 12 to use, after saturated section is circulating mash gas and external air heats, then enter washing section washing carbonizing gas; The carbonizing gas that water wash column 4 top is derived enters in three electric fishing towers 5, traps contained lightweight oil, and processed oil recovery system sent into by the lightweight oil of trapping.Between indirect cool tower 3 and water wash column 4, oxygen on line analyzer can be installed, the content of oxygen in carbonizing gas is set in electric fishing tower 5 operational envelope.When in carbonizing gas, oxygen level exceeds standard, three electric fishing towers 5 can realize auto-breaking.The carbonizing gas of deriving from electric fishing tower 5 tower top becomes malleation through gas exhaust blower 6, deliver to gas dispense station 7 after being pressurizeed by gas exhaust blower 6, after adjustment also control gas dispense station 7 pressure, gas is delivered in the equipment such as destructive distillation heating furnace device, gas retort, the gas recycle system, storage tank and civilian gas.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. high-temperature oil gas method is reclaimed in oil shale distillation classification, it is characterized in that, carries out successively as follows:
A, carbonization gas enter heavy oil washing tower (1) washing, go out heavy oil after First Heat Exchanger (14) heat exchange from tower bottom flow, send into collection mud tank and finished product recovery system; In collection mud tank, gravity separation goes out greasy filth, and upper strata heavy oil is sent into heavy oil washing tower (1) tower top again and carried out circulation cleaning;
B, the carbonization gas sent from heavy oil washing tower (1) tower top reach at the bottom of diesel oil washing tower (2) tower and wash; The heavy gas oil that diesel oil washing tower (2) tower bottom flow goes out sends into collection mud tank and finished product recovery system after the second interchanger (15) heat exchange; In collection mud tank, gravity separation goes out greasy filth, and upper strata heavy gas oil is sent into diesel oil washing tower (2) tower top again and carried out circulation cleaning.
2. high-temperature oil gas method is reclaimed in oil shale distillation classification according to claim 1, and it is characterized in that: after completing steps b, the carbonization gas sent from diesel oil washing tower (2) tower top enters indirect cool tower (3) and water wash column (4) successively; The oil product produced in indirect cool tower (3) process of cooling flows out indirect cool tower by the mode of overflow and is collected to finished product recovery system; The washing water that water wash column (4) tower bottom flow goes out are after stratification, and shale oil enters processed oil recovery system; Washing water enter in air flotation pool and reclaim contained oil in water emulsion; The oil product that water wash column (4) tower top flows out enters electric fishing tower (5); Electric fishing tower (5) traps contained lightweight oil, and the carbonizing gas that electric fishing tower (5) exports is delivered to coal mine gas dispense station (8) after being pressurizeed by gas exhaust blower (6).
3. high-temperature oil gas method is reclaimed in oil shale distillation classification according to claim 2, it is characterized in that: adopt recirculated cooling water to do refrigerant and carry out adverse current cooling to the coal mine gas in indirect cool tower (3).
4. high-temperature oil gas method is reclaimed in oil shale distillation classification according to claim 3, it is characterized in that: in described step a, the temperature of carbonization gas is 490 ~ 510 DEG C.
5. high-temperature oil gas method is reclaimed in oil shale distillation classification according to claim 4, it is characterized in that: between indirect cool tower (3) and water wash column (4), be provided with oxygen on line analyzer, the content of oxygen in carbonizing gas is set in electric fishing tower (5) operational envelope.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112210396A (en) * | 2020-11-30 | 2021-01-12 | 辽宁石油化工大学 | Porous medium external heating filtering type oil shale retort |
| CN114432844A (en) * | 2020-11-04 | 2022-05-06 | 中国石油化工股份有限公司 | Method and system for purifying pyrolysis gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432844A (en) * | 2020-11-04 | 2022-05-06 | 中国石油化工股份有限公司 | Method and system for purifying pyrolysis gas |
| CN114432844B (en) * | 2020-11-04 | 2023-05-12 | 中国石油化工股份有限公司 | Method and system for purifying pyrolysis gas |
| CN112210396A (en) * | 2020-11-30 | 2021-01-12 | 辽宁石油化工大学 | Porous medium external heating filtering type oil shale retort |
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Effective date of registration: 20190410 Address after: 113122 Tiantun Street, Wanghua District, Fushun City, Liaoning Province Patentee after: Fushun Ouli Petrochemical Co., Ltd. Address before: 113001 No. 1, West Section of Dandong Road, Wanghua District, Fushun City, Liaoning Province Patentee before: Liaoming Petrochemical Univ. |