CN103789045B - Dry-method purifying and recycling process for dry distillation gas and mixed type gas condensation device - Google Patents
Dry-method purifying and recycling process for dry distillation gas and mixed type gas condensation device Download PDFInfo
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- CN103789045B CN103789045B CN201410027259.5A CN201410027259A CN103789045B CN 103789045 B CN103789045 B CN 103789045B CN 201410027259 A CN201410027259 A CN 201410027259A CN 103789045 B CN103789045 B CN 103789045B
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Abstract
The invention discloses a dry-method purifying and recycling process for dry distillation gas, which generates less oil sludge, basically does not generate wastewater and can respectively recycle tar with a high boiling point and light oil with a low boiling point, and a mixed type gas condensation device which can be used for overcoming the problem that current spraying and cooling generate a lot of wastewater, and can be conveniently used for rapidly and accurately controlling the temperature of cooled gas. The dry-method purifying and recycling process comprises the following processing steps: (1) carrying out dry-type dust removal and purification on the high-temperature dry distillation gas discharged by an industry kiln stove; (2) introducing dust-removed and purified gas into a first cooling device so that the gas is subjected to non-spraying cooling in the first cooling device to separate out tar; (3) introducing the cooled gas discharged by the first cooling device into a second cooling device so that light oil is separated out from gas after the gas is subjected to the non-spraying cooling in the second cooling device; carrying out subsequent treatment on tail gas. In the first cooling device and the second cooling device, at least the first cooling device is a mixed air cooling device; the device is used for mixing the gas and cooling air to rapidly cool the gas.
Description
Technical field
The present invention relates to a kind of dry distillation gas dry cleaning and recovering process and hybrid air-cooling apparatus.
Background technology
To the technique that the recovery of dry distillation gas mainly adopts be at present: first the High-temperature carbonization coal pneumatic transmission that Industrial Stoves are discharged is entered tornado dust collector and carry out high-temp. vortex dedusting, then directly adopt secondary spraying cooling mode carry out spraying cooling to the gas after dedusting and reclaim tar, tail gas is used for burning or generating.The subject matter that this technique exists is: the first, and because the dust content in gas is large during spraying cooling, thus generation not easily processes greasy filth, easy block system pipeline in a large number; The second, spraying cooling mode produces a large amount of phenolic wastewater, process trouble; 3rd, the tar rate of recovery is low, and the tar quality of recovery is low, and cannot in removal process direct light oil lower to tar higher for boiling point and boiling point is thorough, clean cut separation; 4th, environmental pollution is serious, and the granular material discharged excessive problem of PM2.5 is given prominence to.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of greasy filth few, substantially do not produce waste water and the dry distillation gas dry cleaning and recovering process that tar higher for boiling point and the lower light oil of boiling point can be reclaimed respectively.In addition, the present invention also will provide a kind of hybrid air-cooling apparatus, overcomes current spraying cooling and produces a large amount of useless water problem, and be convenient to carry out controlling fast, accurately to the temperature of cooled gas.
Dry distillation gas dry cleaning and recovering process of the present invention, its step comprises: 1) carry out dry gas cleaning purification to the high temperature carbonization coal gas that Industrial Stoves are discharged, make the dust content in coal gas be reduced to 20-50mg/Nm
3below; 2) coal gas after udst separation is imported the first refrigerating unit, make coal gas separate out tar after non-spraying cooling in the first refrigerating unit, tar flows out from this device and reclaims; 3) coal gas after the cooling of being discharged by the first refrigerating unit imports the second refrigerating unit, and make coal gas separate out light oil after non-spraying cooling in the second refrigerating unit, light oil flows out from this device and reclaims, and tail gas enters subsequent disposal; In described first refrigerating unit and the second refrigerating unit, at least the first refrigerating unit is hybrid air-cooling apparatus, and this hybrid air-cooling apparatus makes coal gas cool rapidly by coal gas and cold gas being carried out mixing; Described hybrid air-cooling apparatus comprises the air-flow hybrid chamber be made up of housing and the fluid collection device be positioned at bottom air-flow hybrid chamber, housing is respectively arranged with the cooled gas entrance be communicated with this air-flow hybrid chamber, cooled gas exports and cold gas entrance, cooled gas mixes with cold gas and is cooled when flowing in air-flow hybrid chamber, and cold gas entrance is connected with cooling source of the gas by flow regulation device.Wherein, described second refrigerating unit can use hybrid air-cooling apparatus, but preferably adopts recuperative heat exchanger for the consideration of its usage economy aspect.
Above-mentioned technique employs a kind of hybrid air-cooling apparatus.The cooling principle of this hybrid air-cooling apparatus is by cold gas being mixed cooled gas (for above-mentioned technique, cooled gas is coal gas, but when this hybrid air-cooling apparatus also may be used for cooling other gases except coal gas) and cooled gas is lowered the temperature rapidly.As long as control the incorporation of cold gas well, the temperature of cooled gas just can be controlled very precisely, and this is significant for the cooling of coal gas.Because, the boiling spread of tar is wider (being generally 450-1000 DEG C), low-temperature pyrolysis tar (450-650 DEG C) can be divided into, medium temperature carbonization tar (600-800 DEG C) and high temperature carbonization tar (900-1000 DEG C), when adopting hybrid air-cooling apparatus, the cooling extent of actual temperature accurate adjustment coal gas in hybrid air-cooling apparatus of the high temperature carbonization coal gas that this hybrid air-cooling apparatus can be discharged according to Industrial Stoves, thus both can obtain the tar of specific boiling range, also be that the second refrigerating unit cooling obtains light oil (boiling point of light oil is generally 30-220 DEG C) creation temperature condition simultaneously.Except cooling rapidly, except feature that temperature can accurately control, because this hybrid air-cooling apparatus makes cooled gas lower the temperature by cold gas being mixed cooled gas in the finite space of air-flow hybrid chamber, pressure effect enhances fluid molecule and reunites, and therefore also can improve the rate of recovery of tar.In addition, the type of cooling of hybrid air-cooling apparatus determines in its process of cooling and does not produce waste water hardly, and has first been reduced to 20-50mg/Nm due to the dust content in coal gas
3below, therefore the growing amount of greasy filth is also little.
In dry distillation gas dry cleaning and recovering process of the present invention, the cold gas that described hybrid air-cooling apparatus uses is preferably from liquid nitrogen source or natural gas liquids source.Liquid nitrogen or LNG temperature low, good cooling results, and the material harmful to coal gas dry-method Recovery Purifying can not be introduced in crude gas.When this hybrid air-cooling apparatus is for cooling other gases except coal gas, suitable cold gas can be selected according to situations such as cooled gas specific natures.
The high temperature carbonization gas temperature of discharging when Industrial Stoves is higher, and the tar boiling temperature of actual recovered relatively low time, preferably in described step 1) and step 2) between increase by the first additional step, import a recuperative heat exchanger by the coal gas after udst separation and carry out high-temperature residual heat recycling, and then the coal gas that recuperative heat exchanger is discharged is imported the first refrigerating unit.Dry distillation gas waste heat can be made full use of like this, save energy consumption.
Dust content in coal gas can be controlled at 20-50mg/Nm by different dry gas cleanings purification means by described step 1)
3below, thus guarantee minute quantity greasy filth produce.Such as, adopt during electric precipitator and just content can be controlled be slightly less than 50mg/Nm
3scope in.Step 1) preferably controls its dust content content, because can reduce dust content (20mg/Nm further like this by adopting the high temperature air filtration device of sintered porous membrane cartridge to carry out dry gas cleaning purification to coal gas
3below), thus reduce the generation of greasy filth, when adopting the high temperature air filtration device containing sintered porous membrane cartridge, the temperature controlling this high temperature air filtration device purge gas is necessary, otherwise, once the purge gas lower by temperature, blowback is carried out to remove the filter cake of cartridge surface to sintered porous membrane cartridge, condensation can be formed immediately in cartridge surface, filter core is made to be subject to the pollution being difficult to recover, reduce its work-ing life, therefore, the present invention's heat transferring medium that also setting carries out heat exchange by described recuperative heat exchanger and coal gas further comprises first medium and second medium, described first medium and second medium are selected one and are entered in recuperative heat exchanger and carry out heat exchange with coal gas under the control of import shifter, after described first medium enters recuperative heat exchanger heating again under the control of outlet shifter as the blowback air of filtration unit the filtration unit back-blowing device that leads, other use sources of leading except filtration unit back-blowing device under the control of outlet shifter again after described second medium enters recuperative heat exchanger heating.Like this, when needs carry out blowback to sintered porous membrane cartridge, first medium (such as nitrogen, argon gas) is injected to recuperative heat exchanger by import shifter, (do not need to heat first medium again by the outlet shifter filtration unit back-blowing device that leads again after first medium is heated, save the energy), act on filter core finally by filtration unit back-blowing device; And when not needing to carry out blowback to sintered porous membrane cartridge, second medium (such as water) is injected to recuperative heat exchanger by import shifter, second medium is heated by outlet shifter and is led other use sources (on such as actual production line numerous occasion needing steam heating to be incubated) again, is more made full use of to make coal gas waste heat.
In above-mentioned technique, the motion of gas can be driven by the blower fan between the first refrigerating unit and the second refrigerating unit, the gas temperature acting on blower fan like this can not too high (lowering the temperature mainly through the first refrigerating unit), dust content is lower (controlling dust content by dry gas cleaning purification above) also, be conducive to blower fan long-term stability to use, and coal gas can, by blower fan supercharging, be conducive to improving heat exchange efficiency before entering the second refrigerating unit; And when being provided with blower fan between the first refrigerating unit and the second refrigerating unit, then in described step 2) and step 3) between preferably also should comprise the second additional step, the coal gas of discharging by the first refrigerating unit directly imports an electrical tar precipitator decoking mist of oil, and then the coal gas that electrical tar precipitator is discharged is imported the second refrigerating unit through described blower fan again.Remove tar fog by electrical tar precipitator, blower fan can be avoided to block because of life-time service.
As the further improvement to hybrid air-cooling apparatus internal structure, the present invention is also provided with one piece or be densely covered with the mixed gas homogenizing plate of breather hole along at least two pieces of air flow line interval in the air-flow hybrid chamber of described hybrid air-cooling apparatus, and described mixed gas homogenizing plate is between the cooled gas entrance of hybrid air-cooling apparatus and cooled gas export.Mixed gas homogenizing plate can extend the residence time of gas in air-flow hybrid chamber, the breather hole simultaneously mixed gas homogenizing plate gathered plays dissemination to air-flow, therefore, cooled gas can be mixed more fully with cold gas by arranging mixed gas homogenizing plate, making cooling efficiency, the tar rate of recovery all gets a promotion.Described mixed gas homogenizing plate can design one for funnel-shaped structure, and bottom it, cone angle place has oil discharge outlet, and like this, the fluid nature can being convenient to adhere to mixed gas homogenizing plate flows to oil discharge outlet, thus prevents mixed gas homogenizing plate from adhering to too much tar and blocking.
A kind of hybrid air-cooling apparatus provided by the invention comprises the air-flow hybrid chamber be made up of housing and the fluid collection device be positioned at bottom air-flow hybrid chamber, housing is respectively arranged with the cooled gas entrance be communicated with this air-flow hybrid chamber, cooled gas exports and cold gas entrance, cooled gas mixes with cold gas and is cooled when flowing in air-flow hybrid chamber, and cold gas entrance is connected with cooling source of the gas by flow regulation device.Wherein, preferably install one piece or be densely covered with the mixed gas homogenizing plate of breather hole along at least two pieces of air flow line interval in the air-flow hybrid chamber of described hybrid air-cooling apparatus, described mixed gas homogenizing plate is between the cooled gas entrance of hybrid air-cooling apparatus and cooled gas export.As above, mixed gas homogenizing plate can be funnel-shaped structure, and bottom it, cone angle place has leakage fluid dram.Above-mentioned hybrid air-cooling apparatus of the present invention not can only be used in dry distillation gas dry cleaning and recovering process, certainly also can be used for other gas cooling and reclaims the occasion of phlegma.This hybrid air-cooling apparatus overcomes current spraying cooling and produces a large amount of useless water problem, and is convenient to carry out controlling fast, accurately to the temperature of cooled gas.
To part provide in the following description below in conjunction with the drawings and specific embodiments aspect that the present invention is described further, the present invention adds and advantage, part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of dry distillation gas dry cleaning and recovering process embodiment of the present invention.
Fig. 2 is a kind of concrete structure schematic diagram of hybrid air-cooling apparatus in the present invention.
Embodiment
An oil-sand dry distillation gas dry cleaning and recovering process is specially shown in Fig. 1.As Fig. 1, the equipment that this oil-sand dry distillation gas dry cleaning and recovering process uses comprises successively:
<1> adopts the high temperature air filtration device 100 of sintered porous membrane cartridge 110, and this high temperature air filtration device 100 is with filter device back-blowing device 120;
<2> recuperative heat exchanger 200, specifically adopts waste heat boiler;
<3> first refrigerating unit 300, it is a hybrid air-cooling apparatus, this device comprises the air-flow hybrid chamber 320 be made up of housing 310 and the fluid collection device 330 be positioned at bottom air-flow hybrid chamber 320, housing 310 is respectively arranged with the cooled gas entrance be communicated with this air-flow hybrid chamber 320, cooled gas outlet and cold gas entrance, wherein, described cooled gas entrance is positioned at the lower side of housing 310, cooled gas outlet is positioned at the upper lateral part of housing 310, cold gas entrance is positioned at housing 310 top and connects a scatterer, cooled gas 810(coal gas) move from bottom to top after cooled gas entrance enters air-flow hybrid chamber 320, cold gas 820(is from liquid nitrogen source or natural gas liquids source) then spray downwards from scatterer and move from top to bottom, when cooled gas 810 upwards flows in air-flow hybrid chamber 320 and cold gas 820 adverse current mixed heat transfer and being cooled, cold gas entrance is connected with cooling source of the gas by flow regulation device, two blocks of mixed gas homogenizing plates 340 being densely covered with breather hole along air flow line interval are also installed in the air-flow hybrid chamber 320 of hybrid air-cooling apparatus, described mixed gas homogenizing plate 340 is between the cooled gas entrance of hybrid air-cooling apparatus and cooled gas export, a wherein mixed closer scatterer of gas homogenizing plate 340, the closer cooled gas entrance of another mixed gas homogenizing plate 340, be main mixed gas heat exchange area between two blocks of mixed gas homogenizing plates 340,
<4> electrical tar precipitator 400;
<5> blower fan 500;
<6> second refrigerating unit 600, this second refrigerating unit 600 is recuperative heat exchanger.
Above-mentioned high temperature air filtration device 100, recuperative heat exchanger 200, first refrigerating unit 300, electrical tar precipitator 400, blower fan 500 and the second refrigerating unit 600 are linked in sequence successively and form coal gas operation stream, wherein, the coal gas to be recycled that blower fan 500 is system entry provides the power in operational process, ingress for carrying out the heat transferring medium of heat exchange with coal gas on recuperative heat exchanger 200 is provided with an import shifter 710(such as T-valve), first medium and second medium can be made to select one enter in recuperative heat exchanger 200 and carry out heat exchange with coal gas, the outlet of heat transferring medium goes out to be provided with an outlet shifter 720(such as T-valve), a wherein branch flow passage of outlet shifter 720 is connected with filtration unit back-blowing device 120, external other of another branch flow passage use source.
Above-mentioned oil-sand dry distillation gas dry cleaning and recovering process is specially: first, the temperature of discharging from gas retort is that the coal gas of 700-800 DEG C enters high temperature air filtration device 100 and carries out dust removal by filtration purification, thus the dust content in outlet coal gas is controlled at 20mg/Nm
3below; Coal gas after udst separation imports recuperative heat exchanger 200 again and carries out high-temperature residual heat recycling, thus gas temperature is reduced to 500-550 DEG C; And then the coal gas that recuperative heat exchanger 200 is discharged is imported the first refrigerating unit 300, the cold gas that this first refrigerating unit 300 uses is from liquid nitrogen source or natural gas liquids source, usage quantity remains on 240-250 DEG C to determine (specifically automatically controlling by the flow regulation device of temperature sensor to cold gas entrance) with the gas temperature exported by the first refrigerating unit 300, coal gas separates out the tar of specific boiling spread in the first refrigerating unit 300 after non-spraying cooling, tar concentrates in fluid collection device 330 and flows out from fluid collection device 330 as required and reclaim; The coal gas that first refrigerating unit 300 is discharged directly imports an electrical tar precipitator 400 decoking mist of oil, and then the coal gas of to be discharged by electrical tar precipitator 400 imports the second refrigerating unit 600 through described blower fan 500 again, coal gas separates out light oil after non-spraying cooling in the second refrigerating unit 600, light oil flows out from this device and reclaims, and tail gas (30-50 DEG C) enters subsequent disposal (can send into point of ignition and make fuel).
In above-mentioned technological process, interval operation filtration unit back-blowing device 120 is needed to carry out blowback to sintered porous membrane cartridge 110, at this moment, by the control of import shifter 710 make described first medium (being specially nitrogen) enter recuperative heat exchanger 200 heat after again under the control of outlet shifter 720 as the blowback air of filtration unit 100 the filtration unit back-blowing device 120 that leads, after blowback terminates, other use sources of leading except filtration unit back-blowing device 120 under the control of outlet shifter 720 again after making described second medium (being specially water) enter recuperative heat exchanger 200 heating by the control of import shifter 710.
Two blocks of mixed gas homogenizing plates 340 being densely covered with breather hole along air flow line interval are installed in the air-flow hybrid chamber 320 of above-mentioned hybrid air-cooling apparatus, be main mixed gas heat exchange area between two blocks of mixed gas homogenizing plates 340, like this, cooled gas 810(coal gas) carry out homogenizing by mixed gas homogenizing plate 340 on the lower after enter this mixed gas heat exchange area and with carry out homogenizing by top mixed gas homogenizing plate 340 after the cold gas 820(that enters from liquid nitrogen source or natural gas liquids source) evenly, fully mix, ensure that the contact heat-exchanging effect of cooled gas and cold gas preferably.
Fig. 2 is the further improvement to above-mentioned hybrid air-cooling apparatus, be about to mixed gas homogenizing plate 340 and be all arranged to funnel-shaped structure, bottom it, cone angle place has leakage fluid dram 341, thus the fluid nature being convenient to adhere to mixed gas homogenizing plate 340 flows to oil discharge outlet 341, then flow out from oil discharge outlet 341, thus prevent mixed gas homogenizing plate from adhering to too much tar and blocking.
In addition, the mixed gas homogenizing plate 340 in above-mentioned hybrid air-cooling apparatus also can be improved to a sandwich structure, namely comprises top plate, lower plywood, keeps at a certain distance away between top plate and lower plywood, the breather hole on top plate and the breather hole staggered arrangement on lower plywood.Like this, will the passage of air-flow turnover flowing be formed between top plate and lower plywood, promote that fluid is separated.
Claims (8)
1. dry distillation gas dry cleaning and recovering process, its step comprises:
1) dry gas cleaning purification is carried out to the high temperature carbonization coal gas that Industrial Stoves are discharged, the dust content in coal gas is controlled at 50mg/Nm
3below;
2) coal gas after udst separation is imported the first refrigerating unit (300), make coal gas separate out tar after non-spraying cooling in the first refrigerating unit (300), tar flows out from the first refrigerating unit (300) and reclaims;
3) coal gas after the cooling of being discharged by the first refrigerating unit (300) imports the second refrigerating unit (600), coal gas is made to separate out light oil after non-spraying cooling in the second refrigerating unit (600), light oil flows out from the second refrigerating unit (600) and reclaims, and tail gas enters subsequent disposal;
In described first refrigerating unit (300) and the second refrigerating unit (600), at least the first refrigerating unit (300) is hybrid air-cooling apparatus, and this hybrid air-cooling apparatus makes coal gas cool rapidly by coal gas and cold gas being carried out mixing;
Described hybrid air-cooling apparatus comprises the air-flow hybrid chamber (320) be made up of housing (310) and the fluid collection device (330) being positioned at air-flow hybrid chamber (320) bottom, housing (310) is respectively arranged with the cooled gas entrance be communicated with this air-flow hybrid chamber (320), cooled gas exports and cold gas entrance, cooled gas (810) mixes with cold gas (820) and is cooled during flowing in air-flow hybrid chamber (320), and cold gas entrance is connected with cooling source of the gas by flow regulation device.
2. dry distillation gas dry cleaning and recovering process as claimed in claim 1, it is characterized in that: in described step 1) and step 2) between also comprise the first additional step, import a recuperative heat exchanger (200) by the coal gas after udst separation and carry out high-temperature residual heat recycling, and then the coal gas that recuperative heat exchanger (200) is discharged is imported the first refrigerating unit (300).
3. dry distillation gas dry cleaning and recovering process as claimed in claim 2, is characterized in that: described step 1) be by adopting the high temperature air filtration device (100) of sintered porous membrane cartridge (110) to carry out dry gas cleaning purification to coal gas; Then
The heat transferring medium being carried out heat exchange by described recuperative heat exchanger (200) and coal gas comprises first medium and second medium, described first medium and second medium are selected one and are entered in recuperative heat exchanger (200) and carry out heat exchange with coal gas under the control of import shifter (710), after described first medium enters recuperative heat exchanger (200) heating again under the control of outlet shifter (720) as the blowback air of filtration unit (100) the filtration unit back-blowing device (120) that leads, other use sources of leading under the control of outlet shifter (720) again except filtration unit back-blowing device (120) after described second medium enters recuperative heat exchanger (200) heating.
4. dry distillation gas dry cleaning and recovering process as claimed in claim 1, it is characterized in that: in this technique, the motion of gas driven by the blower fan (500) be positioned between the first refrigerating unit (300) and the second refrigerating unit (600), then in described step 2) and step 3) between also comprise the second additional step, the coal gas of discharging by the first refrigerating unit (300) directly imports an electrical tar precipitator (400) decoking mist of oil, and then the coal gas of to be discharged by electrical tar precipitator (400) imports the second refrigerating unit (600) through described blower fan (500) again.
5. dry distillation gas dry cleaning and recovering process as claimed in claim 1, is characterized in that: described second refrigerating unit (600) adopts recuperative heat exchanger.
6. as the dry distillation gas dry cleaning and recovering process in claim 1 to 5 as described in any one claim, it is characterized in that: be provided with one piece or be densely covered with the mixed gas homogenizing plate (340) of breather hole along at least two pieces of air flow line interval in the air-flow hybrid chamber (320) of described hybrid air-cooling apparatus, described mixed gas homogenizing plate (340) is between the cooled gas entrance of hybrid air-cooling apparatus and cooled gas export.
7. dry distillation gas dry cleaning and recovering process as claimed in claim 6, is characterized in that: described mixed gas homogenizing plate (340) is funnel-shaped structure, and bottom it, cone angle place has oil discharge outlet (341).
8. as the dry distillation gas dry cleaning and recovering process in claim 1 to 5 as described in any one claim, it is characterized in that: the cold gas that described hybrid air-cooling apparatus uses is from liquid nitrogen source or natural gas liquids source.
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