CN102010732A - Method and device for condensing and recovering shale oil in gas tower section of oil shale distillation system - Google Patents

Method and device for condensing and recovering shale oil in gas tower section of oil shale distillation system Download PDF

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CN102010732A
CN102010732A CN2010105843833A CN201010584383A CN102010732A CN 102010732 A CN102010732 A CN 102010732A CN 2010105843833 A CN2010105843833 A CN 2010105843833A CN 201010584383 A CN201010584383 A CN 201010584383A CN 102010732 A CN102010732 A CN 102010732A
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oil
gas
gas tower
shale
water
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CN102010732B (en
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王剑刚
汪华林
沈其松
徐效梅
杨强
吕文杰
李志明
谢嘉
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East China University of Science and Technology
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Abstract

The invention relates to a method and device for condensing and recovering shale oil in a gas tower section of an oil shale distillation system. The method comprises the following steps: circulating water enters the gas tower for eluting and cooling a distillation gas mixture composed of circulating gas and distillation tar gas; shale oil generated by condensing along with the circulating water containing oil sludge is discharged as distillation effluent from the outlet of the gas tower; the distillation effluent is dedusted to remove the oil sludge in the distillation effluent; then dehydration is carried out to remove the moisture; and finally oil separation dehydration is carried out further to obtain the shale oil product. The invention also provides the device for condensing and recovering the shale oil in the gas tower section of the oil shale distillation system.

Description

Oil shale distillation system gas tower section shale oil condensation recycling method and device
Technical field
The invention belongs to petrochemical complex and environmental protection field, relate to a kind of resinous shale gas tower section distillation system shale oil condensation recycling method, be applicable in the oil shale distillation process gas tower outlet washing water coolant is improved dewater efficient and carry out the shale oil enriching and recovering of desilt.Specifically, the invention provides gas tower section shale oil condensation in the oil shale distillation system and the method and the device that purify collection.
Background technology
Resinous shale claims oil shale again, is a kind of organic sedimentogeneous rock that contains, and generally belongs to the sapropelinite of high mineral, is the low heat value solid fossil fuel, and its look light gray is to brown deeply.It is the same with oil, is that residual body by biology confuses silt and becomes, so can be used for oil refining.Thermal degradation under the condition of secluding air can get shale oil, destructive distillation gas and shale semicockes through low-temperature pyrolysis.Shale oils is similar to crude oil, can be used as oil fuel or further is processed into gasoline, diesel oil and downstream petroleum chemicals.Compare with the conventional oil resource, the recyclable stock number of China's shale oil is equivalent to national oil can adopt 56.5% of stock number, and following development and use have broad prospects, and will become the important supplement of conventional gas and oil resource.Resinous shale had once supported China in the economic construction in oil-poor period, but its research and development also atrophys year by year once once.At the beginning of the nineties in last century, the Fushun Mining Group is introduced circular economy concept, restarts the comprehensive utilization and the research and development of resinous shale, wherein with oil shale oil-refining emphasis the most.
The shale oil refinement technique mainly divides ground destructive distillation and original position (underground) destructive distillation two classes.The ground retorting technique is comparatively ripe, and at present, the shale oil industrial production in the whole world almost all adopts the ground retorting technique.The ground retorting technique is meant after the resinous shale extraction, with distillation apparatus resinous shale is carried out pyrolysis on ground, makes it generate shale oil.Gas retort is the pyrogenous key equipment in ground, by hot carrier gas heated oil shale material in the gas retort, thereby decomposites shale oil gas, with the hot carrier gas of circulating mash gas, association steam etc., carries a certain amount of shale dust and tar secretly and goes out gas retort.In the formula oil shale distillation system of Fushun, generally adopt the combined system of collecting tubule, washing saturator, cooling tower to carry out the condensation and the washing of destructive distillation oil gas.
In traditional Fushun formula oil shale distillation system, generally adopt washing saturator that the destructive distillation gas mixture is carried out the second stage and separate.Washing tower places on the main air saturator, and the benefit of doing like this is both gas mixture to have been carried out the secondary washing, again to main air carried out heating, humidification.But, main air temperature after the process saturator is saturated can't be adjusted according to the actual production demand, and a part of shale oil and the greasy filth taken away unavoidably in the washing water by the air of saturator enters among the main air house steward, thereby causes main air band greasy filth to cause the problem of line clogging.Though main air band greasy filth can be finished by the mode of being inverted washing saturator, so do, because the impulse force of fluid-tight overflow water is not enough, can't finish the task of washing well.Washing saturator is that one also is unfavorable for safety, runs into the situation that power failure or gas, air pressure increase suddenly, also can cause to scurry on the air in the washing tower and irascible incident takes place.The separation of washing saturator can address the above problem.
In up-to-date resinous shale technology, washing saturator is divided into gas tower and air tower, and will wash the part place at the bottom of two Tatas.The gas tower has been born the washing or the cooling of forward gas mixture and circulating mash gas gas, and the air tower has been born the washing or the cooling of forward gas mixture and main air.Gas mixture in the air tower because by previous stage gas tower removed whole greasy filth and washing part under relation, avoided the problem of main air band mud.Adopt the washing of gas tower and air tower twin-stage then to solve the air tower well and be inverted the insufficient problem of washability that causes.Lower part of gas tower is used for gas mixture is carried out partial cooling and washing.Its upper part is then carried out the washing of new one-level to the circulating mash gas that returns from cooling tower, thoroughly remove tar wherein.The bonding surface of top and the bottom is provided with water seal, prevents scurrying mutually of coal mine gas and gas mixture.In the process that recirculated water drenches down through cat head, by fluid-tight, and priority is washed coal mine gas and gas mixture or is cooled off in the overflow mode.Do like this and improved shale oil recovery rate and cooling performance better, avoided the scale problems after greasy dirt enters process furnace.
In present Fushun formula oil shale distillation system, the shale oil yield of washing part (comprising gas tower and air tower) reaches nearly 60%, the gas tower section accounted for especially wherein than many parts, but these oil products just remove greasy filth through the simple washing and the sedimentation of wash trough, dewater by oil trap again, efficient is not high, and since many trickle shale dust or greasy filth can't remove totally, not only influenced the quality of product, but also follow-up pipeline there is stronger corrosive nature, and exist and stop up, the problem of cleaning inconvenience.
Therefore, this area presses for a kind of method that can reclaim oil shale distillation system gas tower section shale oil efficiently of developing.
Summary of the invention
The invention provides a kind of new oil shale distillation system gas tower section shale oil condensation recycling method and device, by suitable greasy filth separating device and oily water separating equipment being set in the wash trough bottom, the raising of the oil production quality of pair set pipeline section does a great deal of good, associated pipe and equipment also there are good maintenance effect, thereby have overcome the defective that prior art exists.
On the one hand, the invention provides a kind of oil shale distillation system gas tower section shale oil condensation recycling method, this method comprises:
Recirculated water enters the drip washing of gas tower and cools off the destructive distillation gas mixture of being made up of circulating mash gas and dry-run tar gas, and the shale oil that condensation produces is discharged as retort sewage from the outlet of gas tower with the recirculated water of carrying greasy filth secretly; And
Retort sewage is carried out dust removal process, to remove the greasy filth in the retort sewage, carry out processed then, to remove moisture wherein, last further oil removal dehydration is to obtain the shale oil product.
One preferred embodiment in, after dust removal process, the greasy filth content in the retort sewage is lower than 0.001 volume %, with the volumeter of described retort sewage through dust removal process.
Another preferred embodiment in, after processed, the yield of shale oil is greater than 99.9%, the water content of product is less than 10%.
On the other hand, the invention provides a kind of oil shale distillation system gas tower section shale oil condensation retrieving arrangement, this device comprises:
The gas tower fly-ash separator that is connected with the end water outlet of gas tower, be used for retort sewage is carried out dust removal process, to remove the greasy filth in the retort sewage, wherein, described retort sewage comprises that recirculated water enters destructive distillation gas mixture that the drip washing of gas tower and cooling be made up of circulating mash gas and dry-run tar gas and the shale oil of condensation generation and the recirculated water of carrying greasy filth secretly;
The gas tower water trap that the mouth of a river is connected that ejects with gas tower fly-ash separator is used for retort sewage is carried out processed, to remove moisture wherein;
With the gun barrel that the water outlet of described gas tower water trap is connected, be used for retort sewage is carried out further oil removal dehydration, to obtain the shale oil product.
One preferred embodiment in, this device also comprises the pump between the end of gas tower water outlet and gas tower fly-ash separator), be used for the retort sewage of water outlet at the bottom of the gas tower is pumped into gas tower fly-ash separator.
Another preferred embodiment in, described gas tower fly-ash separator and gas tower arranged in series, described gas tower fly-ash separator is selected from cyclone dust.
Another preferred embodiment in, described gas tower water trap and gas tower duster parallels arrange that described gas tower water trap is selected from the eddy flow water trap.
Another preferred embodiment in, described oil-water separation tank and gas tower water trap arranged in series, described oil-water separation tank is selected from oil trap.
Another preferred embodiment in, described gas tower fly-ash separator uses in the mode of single-stage or plural serial stage combination.
Another preferred embodiment in, described gas tower water trap uses in the mode of single-stage or plural serial stage combination.
Description of drawings
Fig. 1 is the oil shale distillation system gas tower section shale oil condensation recovery process synoptic diagram according to one embodiment of the present invention.
Embodiment
The present inventor finds through after the extensive and deep research, the tar gas of oil shale distillation system enters the subsequent washing cooling segment after going out collecting tubule, therefore this part produce oil should quite be paid attention to the quality of this a part of oil production generally up to about sixty percent; Adopt gas tower and air tower to replace original washing saturator, just before the main air humidification process, take the lead in the greasy filth in the destructive distillation gas being removed, carry out certain washing and cooling work by the gas tower, have the circulation gas washing thoroughly, main air is not avoided the advantage of process furnace fouling with greasy filth; Owing to still having part shale dust or greasy filth, gas tower section exists in this technology, still need to be provided with desludging device, avoid the pollution problem of greasy filth, in addition by the secondary dewatering system is set, common guarantee the quality of oil production, also solve impurity obstruction or corrosion pipeline and equipment in the water, reduced the difficulty and the treatment capacity of sewage disposal.Based on above-mentioned discovery, the present invention is accomplished.
Technical conceive of the present invention is as follows:
1. in the oil-mud-water mixture that the gas tower section cools off and washing process produces of oil shale distillation process, contain the greasy filth that a large amount of shale dust and empyreumatic oil form, by gas tower fly-ash separator is set, can realize well that recirculated water removes the purpose of greasy filth;
2. in the outlet of gas tower fly-ash separator gas tower water trap and oil-water separation tank are set, the oil-water mixture of handling through desilt is carried out the secondary processed, can guarantee the quality of oil production well.
In a first aspect of the present invention, a kind of method of oil shale distillation system gas tower section shale oil recovery is provided, this method comprises:
Recirculated water enters the drip washing of gas tower and cools off the destructive distillation gas mixture of being made up of circulating mash gas and dry-run tar gas, and the shale oil that condensation produces is discharged as retort sewage from the outlet of gas tower with the recirculated water of carrying greasy filth secretly;
Adopt gas tower fly-ash separator to remove greasy filth in the retort sewage, adopt gas tower water trap to remove wherein most of moisture subsequently, adopt oil-water separation tank to carry out further oil removal dehydration at last, the shale oil of generation goes out device as product.
In the present invention, gas tower fly-ash separator is set, removes shale dust and the formed greasy filth of tar, avoid greasy filth to pollute pipeline, etching apparatus thoroughly removing without collecting tubule at the gas tower bottom.
In the present invention, adopt retort sewage classification dewatering: the retort sewage after purifying through desilt enters gas tower water trap, removes most of moisture wherein; Moisture shale oil enters follow-up oil-water separation tank, removes residual moisture, the qualified shale oil of output.
The greasy filth amount of the oil product after in the present invention, the water outlet of gas tower section is handled through gas tower fly-ash separator is lower than 0.001%.
In the present invention, the oil mass that reclaims behind the contained shale oil process of the gas tower fly-ash separator water outlet gas tower water trap is greater than 99.9%, and the water content of dehydration back oil product is less than 10%.
In a second aspect of the present invention, a kind of device that is used for oil shale distillation system gas tower section shale oil recovery is provided, this device comprises:
The gas tower fly-ash separator that is used for the shale oil recovery desilt is arranged at water outlet at the bottom of the gas tower;
With the gas tower water trap that described gas tower fly-ash separator water outlet links to each other, be used for to gas tower fly-ash separator water outlet and carry out the one-level dehydration;
With the gun barrel that described gas tower water trap water outlet links to each other, be used for gas tower water trap outlet wet oil is carried out the secondary dehydration, and finally go out device as product.
In the present invention, described gas tower fly-ash separator and gas tower arranged in series, the optional spin current fly-ash separator of described fly-ash separator or other all kinds of solid-liquid separating equipments.
In the present invention, described gas tower water trap and gas tower duster parallels are arranged, the optional spin current water trap of described water trap or other all kinds of oily water separating equipments.
In the present invention, described water trap or fly-ash separator use in the mode of single-stage or plural serial stage combination.
Method and apparatus of the present invention can also be used for the substep sepn process of other oil-containing water mixture.
Below referring to accompanying drawing.
Fig. 1 is the oil shale distillation system gas tower section shale oil condensation recovery process synoptic diagram according to one embodiment of the present invention.As shown in Figure 1, collecting tubule outlet destructive distillation gas mixture (from the oil gas of gas retort) enters gas tower 1 bottom, is recycled the water wash cooling; Circulating mash gas in the gas tower comes from cooling tower, and process furnace is returned in circulation; Tar gas is with after the coal mine gas carrier contacts in recirculated water and the tower, tar gas cooling is wherein condensed into destructive distillation crude oil, the greasy filth of flush away shale dust formation wherein simultaneously, oil-water-mud three-phase mixture that this process produces is discharged (part oil gas enters the air tower) as the destructive distillation waste water of gas tower section from water outlet; Destructive distillation waste water is squeezed into gas tower fly-ash separator 3 with pump 2, and strong vortex flow field that produces by high pressure and centrifugal force remove greasy filth wherein, and greasy filth enters the greasy filth treating part by the fly-ash separator bottom; The destructive distillation waste water that comes out from dust remover roof enters gas tower water trap 4, and strong vortex flow field that produces by high pressure and centrifugal force remove moisture wherein; Become the moisture shale oil that oil accounts for main body; Moisture shale oil enters oil-water separation tank 5 (greasy dirt enters follow-up oil removal and handles) from the water trap top exit, carries out the oil of finishing operation and purifies, and goes out device after the oil production metering of purification, and recirculated water returns the gas tower and uses as washing water and water coolant.
The major advantage of method and apparatus of the present invention is:
The present invention adopts recirculated water the destructive distillation gas mixture of oil shale distillation system gas tower section to be carried out the processing of condensation and washing, and adopt liquid-liquid separation technology and solid-liquid isolation technique that the cooling washing water have been carried out purifying treatment, therefrom extract the shale oil product, avoid impurity obstruction or corrosion pipeline and equipment in the water simultaneously, reduced the difficulty and the treatment capacity of sewage disposal.This inventive method technology advanced person, equipment investment cost is lower, and floor space is little, and failure rate is low, and reaction effect is good, and energy consumption is low, can effectively improve the technological process that oil shale distillation system oil-mud reclaims.
Embodiment
Further set forth the present invention below in conjunction with specific embodiment.But, should be understood that these embodiment only are used to the present invention is described and do not constitute limitation of the scope of the invention.The test method of unreceipted actual conditions in the following example, usually according to normal condition, or the condition of advising according to manufacturer.Except as otherwise noted, all per-cent and umber are by weight.
Embodiment 1: Fushun Mining Group dry distillation apparatus for oil shale energy-conserving and emission-cutting technology transformation project
Technical process:
This project adopts device of the present invention, and its technical process as shown in Figure 1.
Washing part oil yield can reach 60% in the common process, washing part in this technology is made up of gas tower and air tower, gas tower section destructive distillation gas mixture is by the cooling washing process of set pipeline section one-level, its shale powder particle concentration reduces greatly, but, because this section oil yield is higher, so still should attach great importance to the influence of quality, so after directly adopting gas tower fly-ash separator to remove greasy filth, the purification of dewatering of feeding gas tower water trap and oil-water separation tank.
Collecting tubule outlet destructive distillation gas mixture enters gas tower 1 bottom, is recycled the water wash cooling; Tar gas is with after the coal mine gas carrier contacts in recirculated water and the tower, tar gas cooling is wherein condensed into destructive distillation crude oil, the greasy filth of flush away shale dust formation wherein simultaneously, oil-water-mud three-phase mixture that this process produces is discharged from water outlet as the destructive distillation waste water of gas tower section; Destructive distillation waste water is squeezed into gas tower fly-ash separator 3 with pump 2, and described fly-ash separator is selected the eddy flow silt remover for use, and strong vortex flow field that produces by high pressure and centrifugal force remove greasy filth wherein; Destructive distillation waste water enters gas tower water trap 4, and described water trap is selected the eddy flow water trap for use, and strong vortex flow field that produces by high pressure and centrifugal force remove moisture wherein, obtain the moisture shale oil that oil accounts for main body; Moisture shale oil enters oil-water separation tank 5, carries out the oil of finishing operation and purifies.
The destructive distillation waste water that the above-mentioned oil removing desilt of process is handled has possessed the condition as recirculated water substantially, squeezes into the gas tower by recycle pump and uses as washing water and water coolant.
Technique effect:
In this technology, gas tower section swirler inlet flow rate is 503000kg/h, and top head piece flow is 493000kg/h, and underflow opening is 10000kg/h, and wherein silt content (referring to the oil rock ash) is 95mg/L, and oleaginousness is 3187mg/L.Through the washing of gas tower section with separate, the outlet of air tower is that air column separator inlet silt content (referring to the oil rock ash) is 0, oleaginousness is 500mg/L; For recirculated water, 0.10MPa falls in the pressure between the import of eddy flow silt remover and the water outlet.When water inlet greasy filth content was not more than 2000mg/L, the water outlet muddy water concentration of eddy flow silt remover was not more than 300mg/L; Analytical value (being not more than 300mg/L) qualification rate 〉=90% of the regulation frequency and the greasy filth phase flow rate of cyclone dust are not more than 10% of eddy flow silt remover inlet flow rate.Pressure between the import of eddy flow water trap and the water outlet is reduced to 0.15-0.25MPa.When eddy flow water trap water inlet oleaginousness was not more than 2000mg/L, water outlet oil concentration was not more than 200mg/L; When the water inlet oleaginousness was not more than 1000mg/L, water outlet oil concentration was not more than 150mg/L; Analytical value (be not more than 200mg/L or be not more than 150mg/L) qualification rate 〉=95% of the regulation frequency.The oil phase flow of eddy flow water trap is about 5% of eddy flow water trap inlet flow rate, and control is not more than 10%.
All quote in this application as a reference at all documents that the present invention mentions, just quoted as a reference separately as each piece document.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after having read above-mentioned teachings of the present invention, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Claims (10)

1. oil shale distillation system gas tower section shale oil condensation recycling method, this method comprises:
Recirculated water enters the drip washing of gas tower and cools off the destructive distillation gas mixture of being made up of circulating mash gas and dry-run tar gas, and the shale oil that condensation produces is discharged as retort sewage from the outlet of gas tower with the recirculated water of carrying greasy filth secretly; And
Retort sewage is carried out dust removal process, to remove the greasy filth in the retort sewage, carry out processed then, to remove moisture wherein, last further oil removal dehydration is to obtain the shale oil product.
2. the method for claim 1 is characterized in that, after dust removal process, the greasy filth content in the retort sewage is lower than 0.001 volume %, with the volumeter of described retort sewage through dust removal process.
3. the method for claim 1 is characterized in that, after processed, the yield of shale oil is greater than 99.9%, and the water content of product is less than 10%.
4. oil shale distillation system gas tower section shale oil condensation retrieving arrangement, this device comprises:
The gas tower fly-ash separator (3) that is connected with the end water outlet of gas tower (1), be used for retort sewage is carried out dust removal process, to remove the greasy filth in the retort sewage, wherein, described retort sewage comprises that recirculated water enters destructive distillation gas mixture that the drip washing of gas tower and cooling be made up of circulating mash gas and dry-run tar gas and the shale oil of condensation generation and the recirculated water of carrying greasy filth secretly;
The gas tower water trap (4) that the mouth of a river is connected that ejects with gas tower fly-ash separator (3) is used for retort sewage is carried out processed, to remove moisture wherein;
With the gun barrel (5) that the water outlet of described gas tower water trap (4) is connected, be used for retort sewage is carried out further oil removal dehydration, to obtain the shale oil product.
5. device as claimed in claim 4 is characterized in that, this device also comprises the end water outlet that is positioned at gas tower (1) and the pump (2) between the gas tower fly-ash separator (3), is used for the retort sewage of water outlet at the bottom of the gas tower is pumped into gas tower fly-ash separator (3).
6. device as claimed in claim 5 is characterized in that, described gas tower fly-ash separator (3) and gas tower (1) arranged in series, and described gas tower fly-ash separator (3) is selected from cyclone dust.
7. device as claimed in claim 5 is characterized in that, described gas tower water trap (4) and gas tower fly-ash separator (3) arranged in series, and described gas tower water trap (4) is selected from the eddy flow water trap.
8. device as claimed in claim 5 is characterized in that, described oil-water separation tank (5) and gas tower water trap (4) arranged in series, and described oil-water separation tank (5) is selected from oil trap.
9. device as claimed in claim 5 is characterized in that, described gas tower fly-ash separator (3) uses in the mode of single-stage or plural serial stage combination.
10. device as claimed in claim 5 is characterized in that, described gas tower water trap (4) uses in the mode of single-stage or plural serial stage combination.
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CN102382670A (en) * 2011-08-10 2012-03-21 上海华畅环保设备发展有限公司 Cyclone concentrating method and device for oil sludge in gas tower section of oil shale dry distillation system
CN104531196A (en) * 2014-12-31 2015-04-22 北票北塔油页岩综合开发利用有限公司 Full-negative-pressure recovery process of dry distillation furnace generation gas in oil shale dry distillation oil refining and system thereof

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