CN100540103C - Waste gas processing method and device in the coke cooling water - Google Patents
Waste gas processing method and device in the coke cooling water Download PDFInfo
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Abstract
The invention provides a kind of cold burnt treatment of waste gas method, it may further comprise the steps: (a) under the absolute pressure of 0.1-0.25MPa, with 5-55 ℃ cold burnt sewage cold burnt waste gas is cooled to 80 ℃ extremely less than 100 ℃, carry out the condensation of lowering the temperature the first time, obtain the mixture of first condensed fluid and residual exhaust gases; (b) with 5-50 ℃ cold burnt sewage the mixture of described first condensed fluid and residual exhaust gases is cooled to 55 ℃ to less than 80 ℃, carries out the condensation of lowering the temperature the second time, obtain the mixture of second condensed fluid and residual exhaust gases; (c) described second condensed fluid is carried out liquid-liquid and separate, obtain water and oil phase, and the water in the described oil phase is discharged, obtain separated oil phase; (d) described water is cooled to be lower than 55 ℃ by heat exchange process, the condensation of lowering the temperature for the third time obtains the 3rd condensation water; (e) described residual exhaust gases is absorbed processing.A kind of cold burnt treatment of waste gas device also is provided.
Description
Technical field
The invention belongs to oils exhaust-gas treatment field, relate to a kind of coupled processing method with oils waste water treatment oils waste gas.Particularly, the present invention relates to cold burnt treatment of waste gas method in a kind of petrochemical industry delayed coking production process, and implement the used device of this method.
Background technology
What the technical staff of petrochemical industry knew is, delayed coking is one of main means of the current clean or white that cheap mink cell focus is converted into high added value, occupies critical role in world refining industry.Delayed coking is one of main economic benefit source of oil refining combined unit, especially a kind of heavy oil of many state key development such as China, the U.S. from now on (abbreviation of mink cell focus, down together) processing method.But, in the delayed coking production process, need a large amount of cooling waters, therefore certainly lead to a large amount of cold burnt waste gas.Be that raw material carries out the cold burnt waste gas that produced in the delayed coking oil refining process with high-sulfur heavy oil particularly, not only entrained solids porous coke powder, liquid phase heavy oil, and contain than polysulfide (comprising inorganic sulphide and organic sulfur compound), temperature is up to 85～125 ℃, become one of primary pollution source of harm humans living environment, become and perplexing people for a long time, a difficult problem of making us feeling timid.
Chinese patent ZL 02216056.6 discloses a kind of delayed coking coke cooling water closed processes device, Chinese patent application CN 1754829A discloses a kind of cool coking effluent treatment method and device, they all are based on solving cold burnt sewage purification and handle problems, but what their emphasis were considered is the handling problem of cold burnt waste water, do not take into full account the improvement of cold burnt waste gas, facts have proved that there is following shortcoming in said apparatus;
(1) corrosive gas such as hydrogen sulfide in the cold burnt waste gas make ferrous sulfide accumulation in the device storage tank, thereby can be in cold burnt waste gas under the inducing of volatile organic matter, cause the blast of coke cooling water hot-water cylinder top annex.For example, blast all once took place in the hot-water cylinder top annex of CNPC, the burnt water treatment system of Sinopec two cover System of Cool Coking of Delayed Coking.
(2) cold burnt waste gas condensation process design is unreasonable, and a large amount of on-condensible gases cause the stench atmosphere pollution directly to airborne release.
(3) in the above-mentioned patent and patent application about cold burnt sewage disposal, the cyclone separation device that in the processing procedure of cold burnt sewage, adopts do not consider that waste gas is strengthened function to the air supporting of the separation process of sulfur-bearing oil-polluted water and gas vaporization and volumetric expansion phenomenon (the sulfur-bearing oil-polluted water is in the rotational flow separation process, the reduction of pressure can make portion gas vaporization effusion in the sewage, influence oil phase and overflow smoothly, but above-mentioned patent and patent application are not given consideration to this situation).Therefore, waste gas will hinder oil phase discharges from the oil phase outlet of cyclone, has reduced the efficient of water-oil separating, has improved the oil concentration of circulation coke cooling water, and circulation will influence the treatment effect of coke cooling water, also the efficient of the cold burnt process of appreciable impact conversely so repeatedly.
In a word, because the problems referred to above that prior art exists, so the science purified treatment problem of unresolved cold burnt waste gas still up to now far can not satisfy the expectation of petrochemical industry cleaning manufactureization.Therefore this area presses for the low and effective cold burnt treatment of waste gas method and apparatus of development cost.
Summary of the invention
The invention provides a kind of cost low and effective cold burnt waste gas processing method and device, thereby solved problems of the prior art.
On the one hand, the invention provides a kind of cold burnt treatment of waste gas method, it may further comprise the steps:
(a) under the absolute pressure of 0.1-0.25MPa, with 5-55 ℃ cold burnt sewage cold burnt waste gas is cooled to 80 ℃ to less than 100 ℃, carry out the condensation of lowering the temperature the first time, obtain the mixture of first condensed fluid and residual exhaust gases;
(b) with 5-50 ℃ cold burnt sewage the mixture of described first condensed fluid and residual exhaust gases is cooled to 55 ℃ to less than 80 ℃, carries out the condensation of lowering the temperature the second time, obtain the mixture of second condensed fluid and residual exhaust gases;
(c) described second condensed fluid is carried out liquid-liquid and separate, obtain water and oil phase, and the water in the described oil phase is discharged, obtain separated oil phase;
(d) described water is cooled to be lower than 55 ℃ by heat exchange process, the condensation of lowering the temperature for the third time obtains the 3rd condensation water;
(e) described residual exhaust gases is absorbed processing.
One preferred embodiment in, in step (c), the water in the described oil phase is discharged by gravitational settling, the water of discharge carries out water circulation use, separated oil phase carries out oily circulation freshening or merges with raw material heavy oil being used for oil refining.
Another preferred embodiment in, in step (d) afterwards, the water of 70-90% carries out water circulate cold burnt process, the water of 10-30% and described cold burnt waste gas condensation by mixing.
Another preferred embodiment in, when cold burnt process stops, proceed cold burnt treatment of waste gas, be brought down below 55 ℃ until the temperature of described cold burnt waste gas.
On the other hand, the invention provides a kind of cold burnt treatment of waste gas device, it comprises:
Coke drum (1); Be connected with the outlet (11) of described coke drum (1), be used under the absolute pressure of 0.1-0.25MPa, with 5-55 ℃ cold burnt sewage will coke cooling water from described coke drum (1) in cold burnt waste gas be cooled to 80 ℃ to pipe-line mixer (2) less than 100 ℃; Is connected with described pipe-line mixer (2) by inlet (13), is used for the cold burnt waste gas of described pipe-line mixer (2) mixing being cooled to 55 ℃ extremely less than 80 ℃ the hot sewage basin of cold Jiao (3) with 5-50 ℃ cold burnt sewage; Be connected with the outlet (18) of the hot sewage basin of described cold Jiao (3), be used to carry out the oil water separator (6) that liquid-liquid separates; The oil tank that is used for further separating oil phase (9) that is connected with the oil phase outlet (22) of described oil water separator (6); The water that is used for separating that is connected with the water outlet (21) of described oil water separator (6) is cooled to be lower than 55 ℃ heat exchanger (7); Being used to of being connected with described heat exchanger (7) provides the coke cooling water basin (8) of described 5-55 ℃ cold burnt sewage; And be connected with the outlet (16) of the hot sewage basin of described cold Jiao (3), be used for residual exhaust gases is sent to the liquid seal can (5) of processing.
One preferred embodiment in, liquid seal can (5) is connected with low pressure gas system or amine method desulphurization system by its outlet (17).
Another preferred embodiment in, the oil water separator (6) of the water that described oil tank (9) is discharged with recycling described oil tank (9) bottom respectively, and the coke drum (1) of the oil that separates of recycling described oil tank (9) upper strata connects.
Another preferred embodiment in, a heat-exchanger pump (4) that is used for the described cold burnt sewage of pumping is set between hot sewage basin of described cold Jiao (3) and described oil water separator (6).
Another preferred embodiment in, described heat-exchanger pump (4) is the delivery pump by variable-frequency control technique control.
Another preferred embodiment in, described pipe-line mixer (2) is venturi type blender or jet pump.
Another preferred embodiment in, described oil water separator (6) is hydrocyclone or gravity separator.
Another preferred embodiment in, described oil water separator (6) is selected from spiral-flow type oil water separator, coarse oil water separator and eddy flow-jet-coarse oil water separator that air supporting is strengthened.
Another preferred embodiment in, described heat exchanger (7) is selected from one or more in dry type or wet type Air-cooled Heat Exchanger, shell-and-tube heat exchanger, plate type heat exchanger, plate-fin heat exchanger and the spiral heat exchanger, their compound mode is in parallel, perhaps series connection and combination in parallel.
Description of drawings
Fig. 1 is the schematic diagram that is used for the cold burnt emission-control equipment of an embodiment of the invention.
The specific embodiment
The invention provides the method and the device of the cold burnt exhaust-gas treatment in a kind of improved petrochemical industry delayed coking production process, thus the process of the clean manufactureization of advance oil chemical industry widely.
The present inventor has drawn following technical conceive through extensive and deep research:
At first, in cold burnt treatment of waste gas technology, set up a solution-air condensation by mixing device, with cold burnt sewage as cooling medium, cold burnt waste gas from being reduced to less than 100 ℃ less than 125 ℃, is realized the condensation of lowering the temperature for the first time, make a large amount of waste gas transfer to liquid phase from gas phase.Because waste gas is the mixture of volatile organic matter and water vapour, water vapor condensation is a water, and volatile organic matter is condensed into oil.Cold burnt waste gas condensate liquid also is an oil water mixture, and is identical with cold burnt sewage character, realizes adopting cold burnt sewage disposal system to handle cold burnt waste gas.
Secondly, utilize in the storage tank 5～50 ℃ cold burnt sewage that the mixture of cold burnt waste water and waste gas is further cooled off, from being cooled to less than 80 ℃ less than 100 ℃, the condensation of lowering the temperature the second time of realizing cold burnt waste gas is converted into the unsteady state of cold burnt waste gas the liquid state of stable state.
Once more, adopt single efficient degreasing device to carry out oil removing from the liquid phase (a kind of sewage of oil-containing sulfur-bearing comprises cold burnt sewage and the condensate liquid that comes from cold burnt waste gas condensation transformation as cooling medium) of storage tank and separate, its single-stage oil removal efficiency reaches 70～80%.After separating obtained oil phase (heavy oil) enters oil tank and further purifies, can return the coke drum freshening or be stored in the oil tank, pump into coke drum when needing again and refine oil, realize oily circulation removal process.
Then, the separating obtained water of efficient degreasing device carries out condensation for the third time by heat exchanger, promptly is lower than 55 ℃ by engine request, better is after being lower than 50 ℃, to enter the coke cooling water basin, pumps into the cold burnt process that coke drum is realized water circulation use when needing again; The oil that condensation is for the third time got off relies on the gravitational settling function of storage tank to accumulate in the top of storage tank, and periodic cleaning also is recovered to slop tank.
By three condensations cooling, 100% water vapour and 95% above volatile organic matter are condensed into liquid state in the cold burnt waste gas; Incondensible waste gas effluxes or is delivered directly to the low pressure gas system after handling by adsorption tanks, relies on the residual on-condensible gas of low pressure gas system handles.
At the cold burnt process initial stage of the coke tower of delayed coking, be start-up period, have a large amount of steam, oil gas and volatile gases containing stench sulphureous gases to overflow in the coke drum, therefore, should adopt pipe-line mixer as the solution-air mixing condenser, so that from the excessive problem of source solution waste gas.
When cold burnt process stops, the burnt sewage of Shang Yuleng in the hot sewage basin of cold Jiao (having the cold burnt sewage of hundreds of cubic meters and the cold burnt waste gas of thousands of cubic meters on the engineering at least), this moment is if decommission, then must make cold burnt sewage accumulation in the hot sewage basin of cold Jiao, cause next cold burnt process not move normally; If arbitrarily be disposed to oil interceptor, also must cause secondary pollution.Therefore, technical measures have been conceived in the method for the present invention: though cold burnt process stops, coke cooling water no longer enters coke drum, but the waste gas that the cold burnt sewage of surplus is carried secretly in the coke drum must enter the hot sewage basin of cold Jiao from the bottom, so condensation process and oil water separation process must be proceeded; Wherein separating obtained water, in being stored in the coke cooling water basin, can also part water be pumped in the hot sewage basin of cold Jiao by arm, oil content in the hot sewage basin of cold Jiao in " sewage " is reduced to till the predetermined low concentration (as 0.01 weight % or lower), at this moment, contained oil droplet size is fine in " sewage ", and sedimentation is slowly, and it can not influence subsequent operation.In a word, by above-mentioned measure, after having solved cold burnt process and stopping, the problem of the cold burnt exhaust-gas treatment of surplus in the hot sewage basin of cold Jiao.
Particularly, above-mentioned technical conceive of the present invention can be realized in the following manner:
Between hot sewage basin of cold Jiao and cold burnt condensing heat exchanger, an oil water separator is set, with pump cold burnt sewage (is referred to the hot sewage that produces in the cold burnt process, industrial custom claims method, pump in the oil water separator down together), by oil water separator the most of oil droplet in the cold burnt waste gas is separated, separative efficiency reaches 70～80%.Separating obtained liquid phase (oil droplet that wherein only contains molecule generally is the olesome less than 10 microns) is with to press to be delivered to oil water separator, and this moment, contained molecule oil did not influence the normal operation of oil water separator.The pump of the cold burnt sewage of pumping can be conventional pump, and preferably by the delivery pump of variable-frequency control technique control, this pump has reduced the fragmentation and the emulsification of cold burnt sewage oil droplet in the pumping process, helps improving the separative efficiency of oil water separation process.
Oil phase band pressure earlier is delivered in oil tank or the sewage jar, the low amounts of water that oil phase is carried secretly can be by gravity settling separation in oil tank or sewage jar, concentrate on the lower floor bottom and discharge, be back to the delivery pump import, realize the closed cycle processing by pipeline by the water outlet.The oil phase on upper strata mostly is the heavy oil of oil refining usefulness greatly, can deliver to oil tank, and when needs, can be pumped to coke drum again and refine oil, and realizes the airtight recovery and the oily circulation freshening of oil phase.Water is then carried by after the airtight heat exchanger cooling with pressing, and reaches the temperature of oil refining engine request, and promptly temperature is lower than 55 ℃, better be after being lower than 50 ℃, to enter the coke cooling water basin, be pumped to coke drum when needing again and carry out water-cooled Jiaozhuo industry, realize the sealing and circulating of water, be called for short the water circulation.
Be applicable to that solution-air condensation by mixing device of the present invention (or claiming the solution-air mixing condenser) has no particular limits, it can be this area solution-air condensation by mixing device commonly used, its representational example comprises, for example cyclone mixer, gravity settler, tower and pipe-line mixer, the preferred pipe-line mixer that adopts, as the venturi type blender, jet pump etc. are wherein with venturi type blender not only features simple structure but also good mixing effect.
Be applicable to that efficient oil water separator of the present invention has no particular limits; it can be this area oil water separator commonly used; its representational example comprises; for example hydrocyclone or gravity separator, spiral-flow type oil water separator, coarse oil water separator and eddy flow-jet-coarse oil water separator of strengthening as air supporting.
Being applicable to that heat exchanger of the present invention has no particular limits, can be this area heat exchanger commonly used, and its representational example comprises, for example Air-cooled Heat Exchanger, shell-and-tube heat exchanger, plate type heat exchanger, plate-fin heat exchanger, spiral heat exchanger.Its heat exchange mode can be many or many heat exchangers of series, parallel combination in parallel, decide by project scale, but the water temperature that guarantees heat exchanger exit is lower than design temperature, is being lower than 55 ℃ usually, to satisfy the temperature requirement of cold burnt process to cold burnt waste gas condensation.
The hot sewage basin of described cold Jiao can be provided with one or more, but generally should be provided with one.For the ease of the technological transformation of existing enterprise with save improvement expenses, should will have oil interceptor on the engineering now and be transformed into airtight oil interceptor and substitute.Such Measures of technical more helps industry of the present invention and applies.
Cold burnt treatment of waste gas method of the present invention and the device also can be used for other oils waste gas pollution control and treatment and component recycling.
Below, method and apparatus of the present invention is described in conjunction with the accompanying drawings.
Referring to Fig. 1.After the oil refining process of delayed coking enters cold burnt operation, start water supply pump 10 earlier, the coke cooling water of cold water in the coke cooling water basin 8 or recovery 12 is pumped into and carries out cold burnt process the coke drum 1 from entering the mouth by pipeline, the cold burnt waste gas that produces is together with cold burnt sewage (a kind of part steam that contains, sulfide, coke powder and wet goods, temperature is 85～125 ℃ a solution-airmixture) come out from exporting 11, after the lower coke cooling water hybrid cooling condensation of the temperature of pipeline 29, waste gas is condensed into liquid, steam is condensed into water, volatile organic matter is condensed into oil, condensate liquid mixes with coke cooling water, 13 import the hot sewage basin 3 of cold Jiao from entering the mouth by pipeline, after the liquid height of hot-water cylinder accumulates to 70% from 30%, start cold burnt sewage heat-exchanger pump 4, cold burnt sewage 18 is pumped into oil water separator 6 and carries out liquid-liquid and separate through entering the mouth, separate obtaining oil phase and water; The oil phase that wherein is entrained with low amounts of water 26 imports the oil tanks 9 through entering the mouth by pipeline from oil phase outlet 22, the low amounts of water of being carried secretly in the oil phase concentrates on the bottom of oil tank 9 and discharges by outlet 27 after the process gravity settling separation in oil tank 9, be back to and carry out closed circuit sealing and circulating processing in the heat-exchanger pump 4; The oil phase that oil tank 9 tops are gathered can be back to freshening the coke drum 1 from exporting 28 by the oil pump (not shown) according to the requirement of oil refining process, realizes the closed circuit sealing and circulating of oil refining engineering recovered oil, is called for short the oil circulation; Separate the water (being entrained with the water of a small amount of oil) that obtains through oil water separator 6, its index is better than the operating environment sanitary standard of national regulation, can satisfy the requirement of delayed coking industry fully, import the heat exchanger 7 by pipeline from water outlet 21, be cooled to once more be lower than 55 ℃ after, import in the coke cooling water basin 8 through pipeline by outlet 23 again, pump into the bottom of coke drum 1 then by water supply pump 10, realize the closed circuit sealing and circulating processing of the condensation waste water of cold burnt process, be called for short the water circulation.By the condensation first time of pipe-line mixer 2, and with the hot sewage basin 3 of cold Jiao in the condensation second time of waste water hybrid cooling after, do not coagulate cold burnt waste gas through outlet 16 through liquid seal cans 5, be transported to low pressure gas system or desulfurizing agent desulphurization system.
Cold burnt process initial start stage, because the high temperature in the coke drum 1, the gas that part steam, oil gas and sulfide must be arranged, be referred to as cold burnt waste gas, discharge from coke drum 1 top outlet 11 together, so near outlet 11, a pipe-line mixer 2 is set, it not only makes the vapor phase contaminants condensation get off, and the cold burnt sewage (temperature is 85～125 ℃) of high temperature is lowered the temperature apace, being provided with of pipe-line mixer 2 is beneficial to the recovery oil phase and solved pollution sources with the excessive problem of gas phase mode from the source; Described pipe-line mixer is good with venturi type water-jet blender.When cold burnt process finishes, because the cold burnt sewage of also remaining remainder hectostere in the hot sewage basin 3 of cold Jiao, the oil that wherein contains 0.01-1 weight %, if cold burnt sewerage also decommissions immediately, oil phase in the hot sewage basin 3 of so cold Jiao, must condense and accumulate, cause difficulty reusing the hot sewage basin of cold Jiao.After adopt stopping on the past engineering immediately with the cold burnt sewage discharge in the hot sewage basin 3 of cold Jiao to oil interceptor, remove the problem of difficulty to avoid deposit, but environmental pollution, stench that this method produces are inevitable.In order to prevent the pollution of the environment, the present invention is after cold burnt process stops, promptly close after coke cooling water enters the valve of coke drum 1, open the valve that coke cooling water enters the hot sewage basin of cold Jiao 3 tops immediately, make the part coke cooling water return to cold Jiao the hot sewage basin 3 from import 15 through arm, the treatment system of cold burnt sewage continues operation, the cold burnt sewage coke cooling water major part of gained after treatment should be stored in the coke cooling water basin 8, small part is returned to the hot sewage basin 3 of cold Jiao, always during the oil content of running cold burnt sewage to the hot sewage basin 3 of cold Jiao≤0.01 weight % till.
The major advantage of method and apparatus of the present invention is:
(a) do not need the extras investment, utilize among the cold burnt sewage-treatment plant of Chinese patent ZL 02216056 and the Chinese patent application CN 1754829A disclosed cold burnt sewage-treatment plant to administer cold burnt waste gas, pollutant emission reduces at least 50%, has also significantly lowered the risk of the coke cooling water hot water tank deck explosive failure that the ferrous sulfide spontaneous combustion causes simultaneously.
(b) cold burnt waste gas has been carried out overall treatment, not only handled can condensation waste gas, also incondensible waste gas is handled, effectively prevented sulphur pollution and odor pollution.
(c) comprehensive utilization of having saved resource and having improved resource.
(d) improve the cleannes of delayed coking unit, strengthened the industrial competitiveness of delay coking process.
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 experimental technique 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 percentage and umber are by weight.
Embodiment
Embodiment 1
In the delayed coking unit of 1,000,000 tons of heavy oil of year disposal ability, be provided with a cover cold burnt emission-control equipment of delayed coking shown in Figure 1, its concrete operation and effect are described below:
When oil refining process enters cold burnt operation, start water supply pump 10, the coke cooling water in the coke cooling water basin 8 12 is pumped into the coke drum 1 from entering the mouth by pipeline, the flow of initial stage feedwater (being commonly called as little feedwater on the engineering) is 6～20 tons/hour; After progressively being full of coke drum, cold burnt sewage overflows from the top outlet 11 of coke drum 1, and the cold burnt sewage temperature that overflows is 85～125 ℃, is entered in the hot sewage basin 3 of cold Jiao by inlet 13 by pipeline; When cold burnt process finished and discharges water, the temperature of the cold burnt sewage in the coke drum 1 was 55～85 ℃, discharged (outlet of inlet double as) by coke drum bottom outlet 12, was entered in the hot sewage basin 3 of cold Jiao by inlet 13 by arm.Cold burnt sewage gathers to liquid level 70%～75% in the hot sewage basin 3 of cold Jiao, open heat-exchanger pump 4, cold burnt sewage in the hot sewage basin 3 of cold Jiao is pressed in the importing oil water separator 6 (spiral-flow type) by inlet 20 bands along pipeline after heat-exchanger pump 4 superchargings, separates obtaining water and oil phase two parts.The oil phase flow accounts for 1～10 volume % of inlet flow rate, the water flow accounts for 99～90 volume % of inlet flow rate, wherein, oil phase is discharged by oil phase outlet 22, enter in the oil tank 9 by inlet 26 along pipeline, be entrained with a spot of water in the oil phase and in oil tank 9, separate the bottom that accumulates in oil tank 9 automatically by gravitational settling, discharge by outlet 27, and import the import of heat-exchanger pump 4 along pipeline, carrying out closed circuit sealing and circulating handles, the oil phase on oil tank top can be incorporated in the oil tank of raw material heavy oil, and (when oil refining process starts) pumps into by the pump (not shown) as the raw material of refining oil and carry out freshening in the coke drum when needing; Wherein water is discharged by water outlet 21, import in the heat exchanger 7 along pipeline, through fully heat exchange, discharge by outlet 23 again after making the temperature of the coke cooling water that heat exchanger exit 23 discharges be lower than 50 ℃, import in the coke cooling water basin 8 through pipeline, proceed cold burnt process along the pipeline pump to coke drum in 1 by water supply pump 10 again, promptly realize described water circulation.Under the normal condition, cold burnt sewage flow rate is 200 tons/hour, cold burnt running about 9 hours circulates, the cold burnt sewage of the high temperature that overflow on coke drum 1 top, can under the absolute pressure of 0.1-0.25MPa (gauge pressure of 0-0.15MPa, wherein the gauge pressure of 0MPa is equivalent to normal pressure), in pipe-line mixer 2 with after part low temperature coke cooling water mixes, enter again in the hot sewage basin 3 of cold Jiao, realize the condensation of lowering the temperature for the first time, can eliminate the volatilization of stench oil gas effectively; After cold burnt process finishes, be positioned at the cold burnt sewage of overflow outlet below 11 of coke drum 1, every tower all has 1200 tons, (the alternately running of two coke drums is arranged) residual cold burnt sewage is then discharged by outlet at bottom 12 (by the outlet of import 12 double as), imports the hot sewage basin 3 of cold Jiao by arm by import 13.Adopt this method, will install and continue to move more than 3 hours, the coke cooling water in returning the hot sewage basin 3 of cold Jiao make the coke cooling water oil content in the hot sewage basin 3 of cold Jiao reduce to 100mg/L with interior, coke cooling water system temperature all less than 50 ℃ till.After entering the hot sewage basin 3 of cold Jiao, the waste gas that still is not condensed enters by behind the liquid seal can 5 through outlet 16, and process outlet line 17 enters atmosphere after entering low pressure gas system or process methyl diethanolamine adsorption desulfurize.But be not used the present embodiment method, ambient air quality around the device is pressed GB/T14678-93 air quality monitoring standard, measure airborne stench with gas chromatograph for determination hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide and by the GB/T14675-93 standard with " 3 comparison expressions are smelt a bag method ", measurement result shows: the present invention has solved the handling problem of cold burnt sewage in the oil-refining chemical process effectively, make no longer contaminated environment of cold burnt process, reached the purpose of clean production.
Contrast effect is summarized as follows before and after transforming:
1. exhaust emission: before the transformation: cooling tower distributes stench, and oil interceptor is distributed stench, and oil interceptor stench concentration is 2000; Concentration of hydrogen sulfide is 16mg/L;
Transform the back: oil interceptor stench concentration is that 20～30 (all airtight its stench concentration are zero, are 20～30 but install regional stench concentration.The numerical value here refers to regional concentration), concentration of hydrogen sulfide is 2mg/L.
2. resources conservation and utilization: before the transformation: part water circulation use, heavy oil do not reclaim or only reclaim on a small quantity, and oil gas all volatilizees;
Transform the back: water is all recycling, and the heavy oil recovery utilization rate is 100%, and oil gas recovery rate is 100%, and water consumption reduces 95%.
This shows, adopt method of the present invention, solved the governing problem of the cold burnt waste gas of cold burnt process institute output fairly perfectly, promptly realize in the waste gas in the sealing and circulating processing of water in the closed processes of volatile organic matter that can condensation and follow-up comprehensive utilization, the waste gas and recycling, the waste gas closed processes of gas that can not condensation and partially recycled, accomplish oils waste gas and oils waste water coupling improvement with really getting twice the result with half the effort, realize non-pollution discharge, thereby advanced the process of industrialization of petrochemical industry cleaner production effectively.
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 instruction content of the present invention, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Claims (11)
1. cold burnt treatment of waste gas method, it may further comprise the steps:
(a) under the absolute pressure of 0.1-0.25MPa, with 5-55 ℃ cold burnt sewage cold burnt waste gas is cooled to 80 ℃ to less than 100 ℃, carry out the condensation of lowering the temperature the first time, obtain the mixture of first condensed fluid and residual exhaust gases;
(b) with 5-50 ℃ cold burnt sewage the mixture of described first condensed fluid and residual exhaust gases is cooled to 55 ℃ to less than 80 ℃, carries out the condensation of lowering the temperature the second time, obtain the mixture of second condensed fluid and residual exhaust gases;
(c) described second condensed fluid is carried out air supporting and strengthen liquid-liquid rotational flow separation, obtain water and oil phase, and the water in the described oil phase is discharged, obtain separated oil phase;
(d) described water is cooled to be lower than 55 ℃ by heat exchange process, the condensation of lowering the temperature for the third time obtains the 3rd condensation water;
(e) described residual exhaust gases is absorbed processing.
2. the method for claim 1 is characterized in that, in step (c), by gravitational settling the water in the described oil phase is discharged, and the water of discharge carries out water circulation use, and separated oil phase is carried out oily circulation freshening or is used for oil refining with the raw material heavy oil merging.
3. method as claimed in claim 1 or 2 is characterized in that, in step (d) afterwards, the water of 70-90% carries out water circulate cold burnt process, the water of 10-30% and described cold burnt waste gas condensation by mixing.
4. method as claimed in claim 1 or 2 is characterized in that, when cold burnt process stops, proceeds cold burnt treatment of waste gas, is brought down below 55 ℃ until the temperature of described cold burnt waste gas.
5. cold burnt treatment of waste gas device, it comprises:
Coke drum (1); Be connected with the outlet (11) of described coke drum (1), be used under the absolute pressure of 0.1-0.25MPa, with 5-55 ℃ cold burnt sewage will coke cooling water from described coke drum (1) in cold burnt waste gas be cooled to 80 ℃ to pipe-line mixer (2) less than 100 ℃; Be connected with described pipe-line mixer (2) by inlet (13), be used for the cold burnt waste gas of described pipe-line mixer (2) being cooled to 55 ℃ extremely less than 80 ℃ the hot sewage basin of cold Jiao (3) with 5-50 ℃ cold burnt sewage; Be connected with the outlet (18) of the hot sewage basin of described cold Jiao (3), be used to carry out the oil water separator (6) that liquid-liquid rotational flow separation is strengthened in air supporting; The oil tank that is used for further separating oil phase (9) that is connected with the oil phase outlet (22) of described oil water separator (6); The water that is used for separating that is connected with the water outlet (21) of described oil water separator (6) is cooled to be lower than 55 ℃ heat exchanger (7); Being used to of being connected with described heat exchanger (7) provides the coke cooling water basin (8) of described 5-55 ℃ cold burnt sewage; And be connected with the outlet (16) of the hot sewage basin of described cold Jiao (3), be used for residual exhaust gases is sent to the liquid seal can (5) of processing.
6. device as claimed in claim 5 is characterized in that, liquid seal can (5) is connected with low pressure gas system or amine method desulphurization system by its outlet (17).
7. as claim 5 or 6 described devices, it is characterized in that, the oil water separator (6) of the water that described oil tank (9) is discharged with recycling described oil tank (9) bottom respectively, and the coke drum (1) of the oil that separates of recycling described oil tank (9) upper strata connects.
8. as claim 5 or 6 described devices, it is characterized in that, a heat-exchanger pump (4) that is used for the described cold burnt sewage of pumping is set between hot sewage basin of described cold Jiao (3) and described oil water separator (6).
9. device as claimed in claim 8 is characterized in that, described heat-exchanger pump (4) is the delivery pump by variable-frequency control technique control.
10. as claim 5 or 6 described devices, it is characterized in that: described pipe-line mixer (2) is venturi type blender or jet pump.
11. as claim 5 or 6 described devices, it is characterized in that: described heat exchanger (7) is selected from one or more in dry type or wet type Air-cooled Heat Exchanger, shell-and-tube heat exchanger, plate type heat exchanger, plate-fin heat exchanger and the spiral heat exchanger, their compound mode is in parallel, perhaps series connection and combination in parallel.
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| CNB2006101487284A CN100540103C (en) | 2006-12-30 | 2006-12-30 | Waste gas processing method and device in the coke cooling water |
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| CN101670188B (en) * | 2009-07-03 | 2011-09-14 | 上海华元实业总公司 | Separation and utilization of waste gas in vat yellow GCN synthesis |
| CN103657133B (en) * | 2013-12-06 | 2015-07-22 | 福建恒嘉环保设备有限公司 | Efficient energy-saving condensing apparatus |
| CN105126530B (en) * | 2015-09-22 | 2017-09-12 | 中石化宁波工程有限公司 | A kind of coking exhaust purifying method |
| CN111320993B (en) * | 2020-03-17 | 2023-04-11 | 北京奥博斯工程技术有限公司 | Automatic coke cooling process method and control for coke tower |
| CN111849023A (en) * | 2020-07-14 | 2020-10-30 | 浙江大学 | Graphene-based melamine foam, and preparation method and application thereof |
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| 冷焦水密闭处理工艺流程设计及工业应用. 徐江华，李和杰，甘丽琳.炼油技术与工程，第33卷第8期. 2003 |
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