CN205032056U - Coking tail gas cleanup unit - Google Patents
Coking tail gas cleanup unit Download PDFInfo
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- CN205032056U CN205032056U CN201520738955.7U CN201520738955U CN205032056U CN 205032056 U CN205032056 U CN 205032056U CN 201520738955 U CN201520738955 U CN 201520738955U CN 205032056 U CN205032056 U CN 205032056U
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Abstract
The utility model relates to coking tail gas cleanup unit, its characterized in that includes the condensation knockout, and coking tail gas pipeline connects the shell side entry of condensation knockout, and the noncondensable gas on the shell side exit linkage methyl alcohol absorption tower (6) of condensation knockout enters the mouth, and the bottom of condensation knockout is equipped with the lime set export, the bottom on methyl alcohol absorption tower is equipped with the export of circulation methyl alcohol, and circulation methyl alcohol exit linkage circulation methanol pipeline still is connected with the second bleeder that is used for discharging the first bleeder of rich methyl alcohol and is used for supplying poor methyl alcohol to circulation methanol pipeline on the circulation methanol pipeline, and the washing alcohol inlet on the lateral wall of methyl alcohol absorption tower is connected through circulation methyl alcohol cooler to the export of circulation methanol pipeline, the setting exports the desulfurization gas entry through pipe connection active carbon absorption tower at the desulfurization gas at methyl alcohol absorption tower top, active carbon absorption tower's top of the tower clarifier exit linkage steam ejector's gaseous phase entry, steam ejector's the exit linkage section of thick bamboo that emptys.
Description
Technical field
The utility model relates to chemical industry equipment, specifically refers to a kind of coking exhaust gas cleaner.
Background technology
The decoking technology of China's delayed coking extensively adopts the mode of hydraulic decoking, carries out the coke drum of decoking, need through blowing, feed water, discharge water, hydraulic coke-cutting, the step such as oil gas preheating.Coke can produce the pollutants such as sewage, coke powder, sump oil and waste gas in cooling, excision process, especially give that water-cooled is burnt, bubble is burnt, in flooding process at device, large amount temperature can be produced at oil-containing, sulfur-bearing, the sewage containing benzene homologues of 90 DEG C ~ about 100 DEG C, the thing followed is the organic exhaust gas of the pollutant such as a large amount of sulfur compound and hydro carbons evaporated under high temperature, there is strong stench penetrating odor, environment and personal safety are constituted a threat to, especially, when device processing high-sulfur inferior raw material, air pollution is even more serious.
Coking tail gas at high temperature easily volatilizees naturally, and totally narrow-minded, pressure is very low, and is mainly steam, hydrocarbon and sulfide in component, reclaims difficulty, process carries no weight, belongs to low discharge, persistence pollution sources, administers comparatively difficulty.
Current Domestic is outer mainly contains the deodorization of desulfurizing agent chemical dry, liquefied ammonia and other alkali lye, the wet chemistry deodorization of amine liquid and charcoal absorption etc. to coking tail gas desulfurization deodorizing method.
Dry desulfurization is by the digester at the solid desulfurating agent dress coke cooling water hot-water cylinder tops such as the oxide of sulphur calcium ferrite, iron, the coking waste gas volatilized and its generation chemical reaction, generate the solid matters such as ferrous sulfide, but ferrous sulfide is not pure substance, itself and coke powder, grease etc. mix formation dirt, structure is relaxed and comfortable, easy spontaneous combustion.Especially ferrous sulfide is in wet environment, and run into the easier spontaneous combustion of air, namely oxidation reaction occurs, ferrous ion is oxidized to ferric ion, and negative divalent sulfur is oxidized to tetravalence sulphur, releases a large amount of heats.Cause local temperature to raise, accelerate the oxidation of the ferrous sulfide of surrounding, thus form chain reaction, cause fire explosion.
The processing technological flow of alkali method desulfurizing technology is: tank deck gas → water sealed tank → alkali (ammonia) flow container (tower) → enter air (entering sulphur chimney).Sulfide and alkaline reaction generate the salts such as vulcanized sodium, NaHS, sodium mercaptides thus remove sulfide.The alkali lye wide material sources of alkali wash, operational processes is simple, the subject matter of this method be spent lye after desulfurization usually containing free alkali 3% ~ 10%, vulcanized sodium and sodium mercaptides are between several thousand to several ten thousand mg/m3, and reclaiming is difficult, cost is high.And according to " National Hazard refuse register ", spent lye belongs to hazardous waste.
The main component of amine desulfurization is N methyldiethanol amine (MDEA), weak acid (H2S) and weak base (hydramine) reaction form water-soluble complex salt, it is reversible, exothermic reaction, desulfurizing agent low temperature of absorption hydrogen sulfide, under high temperature can desorption out, amine liquid can realize regeneration, can be recycled, because this reducing desulfurizing agent cost.But MDEA price is higher, because alkalescence is weak, with CO
2reaction speed is comparatively slow, under low pressure uses and easily occurs purified gas H
2s content overproof; In addition, the foaming of organic amine mixed liquor ubiquity, block the phenomenon of liquid, degraded, bring considerable influence can to the stable operation of production system.
The ammoniacal liquor of 30% (w) is also carried out deodorization as deodorant to waste gas by Some Enterprises in addition, and deposed ammonia drains into sewage stripping device process.This technical scheme only uses ammoniacal liquor as lyosoption, still can residual fraction lower carbon number hydrocarbons in dropping a hint, and meanwhile, the toxicity of ammonia solution own is negligible risk, and its volatility is high, and simultaneously with penetrating odor, Long-term absorption can to human body and environmental pollution and pollution.
In the above-mentioned processing method of delayed coking waste gas, the technique adopted or itself there is defect, energy consumption is large, it is high to invest, security is lower, causes secondary pollution, or only has desulfurizing function, or have desulfurization take off hydrocarbon ability but emptying wherein hydrocarbon sulfur content still exceed standard.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of handling process short, stable for the present situation of prior art and do not have secondary pollution, coking exhaust gas cleaner that security is good.
The utility model solves the problems of the technologies described above adopted technical scheme: this coking exhaust gas cleaner, it is characterized in that comprising condensation knockout, coking exhaust pipe road connects the shell side inlet of condensation knockout, the shell-side outlet of condensation knockout connects the fixed gas entrance of methanol absorber tower 6, and the bottom of condensation knockout is provided with condensate outlet;
The bottom of described methanol absorber tower is provided with recycle methanol outlet, recycle methanol outlet connects recycle methanol pipeline, recycle methanol pipeline is also connected with the first branched pipe for discharging rich methanol and the second branched pipe for supplementing poor methanol to recycle methanol pipeline, recycle methanol pipe outlet connects the washing methanol inlet on methanol absorption tower side wall by recycle methanol cooler; The desulfurized gas outlet being arranged on methanol absorption top of tower connects the sweet gas entrance of activated carbon adsorber by pipeline;
The tower top clarifier outlet of described activated carbon adsorber connects the gas phase entrance of steam jet ejector, and the outlet of steam jet ejector connects emptying cylinder.
Preferably, described methanol absorber tower can share same tower body with described activated carbon adsorber, and described activated carbon adsorber is positioned at the top of described methanol absorber tower.
Described condensate outlet and the outlet of described recycle methanol are equipped with vortex breaker, opening vortex generation bubble effectively can be prevented out to enter pipeline cavitation is produced to pump.
Demister is equipped with, to retain the liquid phase of carrying secretly in air-flow on the shell-side outlet of described condensation knockout, on the desulfurized gas outlet of described methanol absorber tower and in the clarifier outlet of described activated carbon adsorber.
Described clean gas outlet can be welded on blind flange, and described blind flange is detachably connected on the end face of described activated carbon adsorber, to facilitate the operations such as the filling of checking maintenance and active carbon.
Condensation knockout in above-mentioned each scheme can select as required of the prior art any one, preferably, described condensation knockout can comprise housing, the first bobbin carriage and the second bobbin carriage is provided with in housing, be provided with U heat exchange bundle in housing, there is bottom U heat exchange bundle and between the inner bottom surface of housing gap and form liquid storage space; Housing sidewall is provided with shell side inlet shell-side outlet, shell side inlet is also provided with erosion control baffle plate, the top of housing is provided with the refrigerant inlet be connected with the first bobbin carriage and the refrigerant exit be connected with described second bobbin carriage.
Compared with prior art, coking exhaust gas cleaner provided by the utility model has following advantage:
1, coking tail gas is through condensation, methyl alcohol desulfurization deodorizing, the configuration of charcoal absorption, water and large molecule hydrocarbon condensation separation, sulphur component low temperature absorption, all the other component adsorbing and removings, tertiary treatment, while removing malodor source-sulfide, effectively can also solve the discharge beyond standards problem of organic hydrocarbon, flow process as far as possible short prerequisite be issued to the object that coking tail gas full constituent processes simultaneously.
2, using methyl alcohol as the sulfide lyosoption of coking tail gas, make full use of the feature of methyl alcohol to the effective easy regeneration of polar molecule Physical Absorption, overcome the degraded of other solution chemical processing modes, secondary pollution problems simultaneously.
3, at adsorption tower end, coking tail gas is aspirated by steam jet ejector, make device be in tiny structure, for coking tail gas provides circulation power, the shortcoming of poor fluidity, the difficult treatment of naturally volatilizing under can solving coking tail gas normal pressure.
4, steam jet ejector is arranged on device end, and the cold of condensation knockout demand is little, and heat exchange area is few, and condensation and separatory are realized in a condensation knockout, and methanol absorber tower and activated carbon adsorber are united two into one, flow process is shorter, equipment investment is lower, and floor space is little.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
As shown in Figure 1, this coking exhaust gas cleaner comprises:
Condensation knockout 1, lime set pump 2, steam jet ejector 3, methanol absorber tower 6, activated carbon adsorber 5, methanol loop pump 8 and recycle methanol cooler 4 and emptying cylinder 10.
Wherein, condensation knockout 1 is placed on steel structure platform 9 by journal stirrup 14, and steam jet ejector 3, recycle methanol cooler 4 and emptying cylinder 10 are also arranged on steel structure platform 9, and lime set pump 2 and methanol loop pump 8 are placed on the ground below steel structure platform 9.Methanol absorber tower 6 is overlapping with activated carbon adsorber 5 to be placed, and both share same tower body, and adsorption tower 5 is positioned at the top on absorption tower 6, both is isolated by upper and lower end socket; Namely the low head of upper cover and tower body and corresponding tower body form absorption tower 6, and the upper cover of low head and tower body and the tower body part of correspondence form adsorption tower 5; Methanol absorption tower bottom supports with skirt 7, installs on the ground.
Condensation knockout 1 comprises housing 13, is disposed side by side on first bobbin carriage 11 and second bobbin carriage 11 ' at housing 13 top, U heat exchange bundle 15 is provided with in housing, the entrance of U heat exchange bundle is communicated with the first bobbin carriage 11, outlet second bobbin carriage 11 ' of U heat exchange 11 '; There is bottom U heat exchange bundle and between the inner bottom surface of housing gap and form liquid storage space; Housing sidewall is provided with shell side inlet 12 and shell-side outlet 16, shell side inlet 12 is also provided with erosion control baffle plate 122, that restrains to prevent the rear swiftly flowing coking tail gas of pressurization and mixture of steam heat exchanging washes away; Shell-side outlet 16 is provided with the first demister 17, for retaining the liquid phase of carrying secretly in fixed gas.
The coking tail gas come from upstream enters in housing from shell side inlet 12, with the refrigerant heat exchange in U heat exchange bundle, moisture in coking tail gas and large molecule hydrocarbon component are cooled and are separated and are stored in the liquid storage space of bottom, and fixed gas is sent to methanol absorber tower 6 through shell-side outlet 16.After refrigerant for cooling enters from the refrigerant inlet 120 at bobbin carriage 11 top after U-tube recurrent canal box top, discharge through refrigerant exit 121, refrigerant can be recirculated water or other medium.
The bottom of housing 13 is provided with condensate outlet 19, condensate outlet 19 is provided with the first vortex breaker 18, and the liquid phase component separated that is condensed in coking tail gas recycles from the discharge of this condensate outlet further via sending delayed coking back to by condensate pipe 21 after lime set pump 2 pressurization.
Be provided with journal stirrup 14 in the middle part of the cylinder body outer wall of condensation knockout 1, according to the diameter of condensation knockout 1, journal stirrup quantity is 2 ~ 4, is suspended on steel structure platform 9 by journal stirrup by condensation knockout, for lime set pump 2 provides net positive suction head.
Methanol absorber tower 6 is entered from fixed gas entrance from condensation knockout fixed gas out.
Methanol absorber tower 6 is the airtight cavities surrounded by housing and upper and lower end socket, methanol absorber tower 6 top is provided with desulfurized gas outlet 63, is provided with coking tail gas fixed gas entrance 69 in methanol absorber tower housing sidewall bottom; Fixed gas entrance connects the first gas distributor 61 in tower body, to make the coking tail gas fixed gas sent here from condensation knockout be evenly distributed, ensures methanol wash assimilation effect.The tower body side wall upper part of methanol absorber tower 6 is provided with washing methyl alcohol import 65, methanol absorption tower bottom is provided with recycle methanol outlet 68 and the second vortex breaker 67, second vortex breaker is arranged on recycle methanol exit, the outlet of this recycle methanol is connected with methanol loop pump 8, recycle methanol is connected with the methanol inlet 41 of recycle methanol cooler 4 by pipeline after the pressurization of recycle methanol pump, be provided with two branched pipes entering on the pipeline before recycle methanol cooler 4, wherein the first branched pipe 43 is rich methanol outlet, the recycle methanol absorbing sulphur component in coking tail gas thus outlet delivers to corollary apparatus regeneration, second branched pipe 44 supplements mouth for fresh methanol, fresh methanol can be supplemented continuously or discontinuously to system, the methanol outlet 42 of recycle methanol cooler 4 is connected with described washing methanol inlet 65, washing methanol inlet 65 is connected with the liquid phase distributor 62 be arranged in methanol absorber tower 6 cavity, and washing methyl alcohol returns the washing desulphurization deodorizing of methanol absorber tower to coking tail gas by liquid phase distributor 62.
Methanol absorber tower 6 is column plate absorption tower, and column plate 66 can be single overflow or multi-overflow structure.
The desulfurized gas outlet 63 of methanol absorption top of tower connects the activated carbon adsorber 5 on top by pipeline, desulfurized gas outlet 63 is also provided with the second demister 64, to reduce the methyl alcohol carried secretly when coking tail gas rises, reduce methanol loss, extend active carbon life cycle, the second demister can be folded plate type or other form.
The lower sidewall of activated carbon adsorber 5 is provided with sweet gas import 55, through methanol absorber tower desulfurization deodorizing coking tail gas from then on mouth enter, sweet gas import 55 connects the gas distributor 56 be arranged in activated carbon adsorber.Clean gas outlet 51 is set at top, is filled with active carbon 54 at middle part.Sweet gas is removed after residual small molecule hydrocarbon through charcoal absorption from bottom to top and is delivered to steam jet ejector 3 through clean gas outlet 51.Also be provided with the 3rd demister 59 at charcoal absorption top of tower, clean gas outlet 51 is welded on blind flange 52, and blind flange 52 is connected with adsorption tower closure stud, and clean gas outlet can be dismantled together with blind flange, to facilitate the replacing of active carbon.
Activated carbon adsorber 5 side wall upper part is provided with hot nitrogen back blow port 53, bottom low head, is provided with sewage draining exit 57, after the absorption of active carbon reaches capacity, regularly can pass into hot nitrogen and desorption and regeneration is carried out to charcoal bed reduce with dry.
Above-mentioned liquid phase distributor can select tubular type in prior art, slot type or spray-type liquid distribution trough as required, or the liquid distribution trough of other structure, and the discharging direction of liquid distribution trough upwards can be sprayed and also can be sprayed downwards; Above-mentioned gaseous distributer selects existing conventionally form.Distributor can be Flange joint with the type of attachment of the mouth of pipe or weld pattern.
The setting of each vortex breaker effectively can prevent out opening vortex generation bubble to enter pipeline and produce cavitation to pump.
After steam jet ejector 3 is arranged on charcoal absorption tower top clean gas outlet 51, and be provided with steam inlet, device is made to be in tiny structure by injecting steam, be continuously coking tail gas and power is provided, the shortcoming of poor fluidity, the difficult treatment of naturally volatilizing under the setting of steam jet ejector can solve coking tail gas normal pressure.
Also be provided with emptying cylinder 10 after described steam jet ejector, lime set and gas phase separation in emptying cylinder, gas phase media is from the discharge of drain height point, and lime set is discharged from bottom safety.
Claims (6)
1. coking exhaust gas cleaner, it is characterized in that comprising condensation knockout (1), coking exhaust pipe road connects the shell side inlet (12) of condensation knockout (1), the shell-side outlet (16) of condensation knockout connects the fixed gas entrance (69) of methanol absorber tower (6), and the bottom of condensation knockout is provided with condensate outlet (19);
The bottom of described methanol absorber tower is provided with recycle methanol outlet (68), recycle methanol outlet connects recycle methanol pipeline (45), recycle methanol pipeline (45) is also connected with the first branched pipe (43) for discharging rich methanol and the second branched pipe (44) for supplementing poor methanol to recycle methanol pipeline, recycle methanol pipe outlet connects the washing methanol inlet (65) on methanol absorption tower side wall by recycle methanol cooler (4); The desulfurized gas outlet (63) being arranged on methanol absorption top of tower connects the sweet gas entrance (55) of activated carbon adsorber (5) by pipeline;
The tower top clarifier outlet of described activated carbon adsorber connects the gas phase entrance of steam jet ejector (3), and the outlet of steam jet ejector (3) connects emptying cylinder (10).
2. coking exhaust gas cleaner according to claim 1, it is characterized in that described methanol absorber tower (6) shares same tower body with described activated carbon adsorber (5), and described activated carbon adsorber is positioned at the top of described methanol absorber tower.
3. coking exhaust gas cleaner according to claim 1 and 2, is characterized in that described condensate outlet (19) and described recycle methanol outlet (68) are equipped with vortex breaker.
4. coking exhaust gas cleaner according to claim 3, is characterized in that the shell-side outlet (16) of described condensation knockout is upper, the upper outlet on (51) with the clarifier of described activated carbon adsorber of the desulfurized gas outlet (63) of described methanol absorber tower is equipped with demister.
5. coking exhaust gas cleaner according to claim 4, it is characterized in that described clean gas outlet (51) is welded on blind flange (52), described blind flange (52) is detachably connected on the end face of described activated carbon adsorber.
6. coking exhaust gas cleaner according to claim 5, it is characterized in that described condensation knockout (1) comprises housing (13), the first bobbin carriage (11) and the second bobbin carriage (11 ') is provided with in housing (13), be provided with U heat exchange bundle (15) in housing, there is bottom U heat exchange bundle and between the inner bottom surface of housing gap and form liquid storage space; Housing sidewall is provided with shell side inlet (12) and shell-side outlet (16), shell side inlet (12) is also provided with erosion control baffle plate (122), and the top of housing is provided with the refrigerant inlet (120) be connected with the first bobbin carriage (11) and the refrigerant exit be connected with described second bobbin carriage (11 ').
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520738955.7U CN205032056U (en) | 2015-09-22 | 2015-09-22 | Coking tail gas cleanup unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520738955.7U CN205032056U (en) | 2015-09-22 | 2015-09-22 | Coking tail gas cleanup unit |
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| CN205032056U true CN205032056U (en) | 2016-02-17 |
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| CN201520738955.7U Active CN205032056U (en) | 2015-09-22 | 2015-09-22 | Coking tail gas cleanup unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111068440A (en) * | 2018-10-18 | 2020-04-28 | 中国石油化工股份有限公司 | Coking tail gas treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111068440A (en) * | 2018-10-18 | 2020-04-28 | 中国石油化工股份有限公司 | Coking tail gas treatment device |
| CN111068440B (en) * | 2018-10-18 | 2022-07-15 | 中国石油化工股份有限公司 | Coking tail gas treatment device |
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