CN1089262C - Method of raising the efficiency of runner type adsorption system in eliminating volatile organic waste gas - Google Patents

Method of raising the efficiency of runner type adsorption system in eliminating volatile organic waste gas Download PDF

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Publication number
CN1089262C
CN1089262C CN99109004A CN99109004A CN1089262C CN 1089262 C CN1089262 C CN 1089262C CN 99109004 A CN99109004 A CN 99109004A CN 99109004 A CN99109004 A CN 99109004A CN 1089262 C CN1089262 C CN 1089262C
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runner
waste gas
desorption
adsorption
volatile organic
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CN1277070A (en
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郑石治
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Huamao Science & Technology Co ltd
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Huamao Science & Technology Co ltd
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Abstract

The present invention relates to a method for enhancing treatment efficiency of volatile organic gas or bad odor or toxic gas in industrial air exhaust of a rotating wheel type adsorption system. A preheating region is additionally arranged between an adsorption region and a desorption operation region of a rotating wheel, preheating cycle is utilized to change the temperature distribution of the desorption region so as to enhance the desorption efficiency, and a high efficiency rotating wheel type adsorption treatment system which comprises continuous operation of adsorption, preheating, desorption, cooling, etc. is formed.

Description

Promote runner type adsorption system and remove the method for volatile organic waste gas efficient
The present invention is a kind of method that promotes runner type adsorption system removal volatile organic waste gas efficient, its be with the runner adsorption system adsorptive section, set up between a preheating zone, utilize warm-up cycle to quicken the interval uniform distribution of temperature of runner adsorption system desorption, to promote desorption rate, the method of raising industry exhaust-gas treatment benefit must thermal cycle reduce the required heat that adds for circulating with the space.
The absorption method is a kind of method that is widely used on the industry as pump-down process, utilize the character of adsorbent porous, VOC, stink or poisonous gas in the industry exhaust can be produced the absorption of physics, and it is adsorbed in the hole of adsorbent, to reach the purpose of purification industry exhaust.Yet adsorbent must be via the program of regeneration after absorption is saturated, with filling in adsorbent be adsorbed matter (for example volatile organic molecule, higher boiling chemical substance ... etc.) remove, just reusable.Wherein runner type adsorption system is a regenerative operation system on a kind of continous way line of succeeding in developing in recent years.Mainly be that adsorbent is coated on the wheel of the various round or column types of making the honeycomb base material, for example be coated with activated carbon, zeolite or silica gel ... wait on the honeycomb base material wheel of ripple glaze that various fiber is made of adsorbent, fiber commonly used includes ceramic fibre, carbon fiber, glass fibre or adhesive-bonded fabric etc.Again wheel is divided between three operating spaces of absorption, desorption and cooling (as Fig. 1 or shown in Figure 2).Wheel rotates with certain speed, the industry waste gas that contains volatility organic component or stink composition or toxic chemical is when leading people's adsorption zone, adsorbent on the runner is with volatile organic matter or stink composition or toxicant absorption, and reaching the purpose of waste gas purification, the waste gas after the purification can directly be thrown in the atmosphere.When runner changes the desorption district over to, generally entering the volatile organic matter desorption that the desorption district will be adsorbed in the wheel surface adsorbent through pre-heated air stream with the direction opposite with waste gas stream comes out, make adsorbent reactivation and use (as shown in Figure 3) so that continue, the temperature of general desorption manipulation is decided on the material of adsorbent and base material between 100-200 ℃.The concentrated waste gas that desorption comes out then imports a burner and carries out combustion decomposition, or imports a condenser and carry out condensation and reclaim.Usually the multiple that concentrates is high more has an economic benefit more, but considers the restriction of explosive range, generally is desorption when carrying gas with the air, concentrated multiple be controlled at 4-30 doubly between.In addition, for increasing the benefit of handling, set up behind the desorption district cooling zone is arranged, flow into the direction identical with one cold air or industry waste gas with waste gas stream, the base material cooling of the condition of high temperature will be in, promoting the absorption benefit of follow-up adsorption zone, the band temperature waste gas that flows out then imports heater, is heated to behind the desorption temperature usefulness as desorption gas again.(seeing U.S. Patent No. 5348922) since the adsorption system that adopted for adsorbent is coated the honeycomb wheel surface with straight-through duct, pressure fall general granular ADSORPTION IN A FIXED BED commonly used system will be low many, therefore the high approximately 5-10 of the ADSORPTION IN A FIXED BED system that the linear velocity of its operation is more general doubly is particularly suitable for the usefulness of the exhaust-gas treatment of big air quantity.But owing to have regeneration and use continuously on the line, therefore advantages of simple operation is widely used in semiconductor industry and application industry etc. again.Though the runner adsorption system has volume little, the high advantage of handling air quantity, but owing to absorption, desorption are all operated in certain finite interval, and for continous way is carried out, the removal efficiency in desorption district not only influences the service life of follow-up adsorption operations efficient and runner and the concentration that influence purifies the back discharging waste gas.Especially locate to bury the waste gas that contains the higher boiling chemical substance, for example containing N-methyl one pyrrole noise made in coughing or vomiting ketone (n-MethylPyrolidone), methyl-sulfoxide (Dimethyl Sulfoxide); Ethyl ketone amine (2-Amino-Ethanol); When the waste gas of ethylene glycol (Ethylene Glycol) etc. is formed, often can't effectively remove these materials when then carrying out desorption and regeneration in the desorption district, cause in its adsorbent hole that residues in wheel surface, long-term accumulation not only causes the decline of follow-up adsorption capacity, emission gases does not reach within the environmental regulation specified standard, and, the danger of catching fire is often arranged and must change runner or do other processing because high solvent accumulates in the runner.For example runner is pulled down with line outward more the mode of high temperature (300-1000 ℃) burn off these materials are removed, can this involves the runner base material again high temperature resistant, even some runner base material (for example ceramic fibre) can be high temperature resistant, though but the mode of high temperature burn off can effectively be decomposed or removes being stranded in the intrapore high boiling substance of adsorbent, but often easily cause the destruction of adsorbent pore space structure, and lose adsorption capacity, or thereby deterioration and cause the surfacial spalling of adsorbent self-rotation wheel to predetermined substance.In addition, at cargo handling process, there is secondary pollution problem to exist unavoidably.
Traditional rotor design, normally adsorbing below 45 ℃, adsorb and promptly directly enter the regeneration of desorption district after saturated, the operation of desorption is with one thermal air current (or waste gas stream) that increases temperature (120-200 ℃) desorption district that flows through, the organic solvent desorption that utilizes hot poor mode will be adsorbed in the adsorbent comes out, the temperature difference in common two districts is between 80-160 ℃, in addition in order to keep higher operational benefits, the time of staying in the desorption district is unsuitable oversize again, often cause runner base material temperature skewness, position in outlet does not reach predefined desorption temperature, and the temperature of entrance location is quite high, make in the adsorbent of entrance location and produced desorption, but meet when arriving near the exit position cold be adsorbed once again again or produce condense and be attached to surface (runner honeycomb duct is near the position of the outlet) (see figure 4) of adsorbent.Especially when processing contained high boiling substance waste gas, this kind phenomenon was more obvious.
In order to improve the shortcoming of existing runner system, the object of the present invention is to provide a kind of method that runner type adsorption system is removed volatile organic waste gas efficient that promotes, it can remove volatile organic waste gas effectively.
A kind of method that promotes runner type adsorption system removal volatile organic waste gas efficient of the present invention, it is characterized in that runner is divided between four operating spaces such as absorption, preheating, desorption and blast-cold, utilize the warm-up cycle mode to carry out the method that processing or solvent recovery processing are removed in waste gas absorption; The gas temperature that carries of its preheating zone is between 60-120 ℃; The gas that carries of its preheating zone is directly led people's desorption district, or imports the desorption district after heat exchanger heats again.
The gas that carries of its preheating zone can be the industry exhaust, or air, or nitrogen, or other active gases not.
Its runner pattern is wheeled or drum type brake, and with ceramic fibre, or carbon fiber, or macromolecular fibre is base material, and the surface is coated with zeolite, or activated carbon, or laminated soil, or polymeric sorbent.
The area of its adsorption zone for the runner axle center by the open angle angle of center two radius be 180 to 330 spend between included areal extent; The areal extent in preheating zone and desorption district respectively is an angle angle 10-120 degree; The areal extent in blast-cold district is the 10-72 degree for the angle angle.
Waste gas is that the speed with 0.3 meter per second-5 meter per second enters runner.
Its equipment for after-treatment can be incineration process or solvent recovering system.
For further specifying feature of the present invention and effect, below in conjunction with drawings and Examples the present invention is done a detailed description, wherein:
Fig. 1 is for commonly using the vertical runner organigram;
Fig. 2 is for commonly using column type runner structure schematic diagram;
Fig. 3 is for commonly using exhaust treatment system figure;
Fig. 4 is for commonly using runner internal solvent and temperature profile;
Fig. 5 is a runner structure schematic diagram of the present invention;
Fig. 6 is exhaust treatment system figure of the present invention.
The present invention changes the runner adsorption system into four operating spaces such as absorption, preheating, desorption and blast-cold Between (as shown in Figure 5), runner changes respectively (1) absorption (2) in the following order with fixing rotating speed Four zones such as preheating (3) desorption and (4) blast-cold. Adsorb saturated adsorbent, earlier through pre-Heat enters the desorption district again and carries out with 120-220 ℃ temperature after 60-120 ℃ Desorption and regeneration. Mainly be to utilize the gas flow of blast-cold as warm-up cycle, this not only can save the energy Consumption and can reduce the temperature difference between adsorption system and desorption system, make the temperature in desorption district can be quick Be evenly distributed, the VOC that is adsorbed in the agent of arbor wheel adsorption can be by absorption Desorption comes out in the agent hole, and break away from fast the honey comb like duct of runner, not in the reason duct Temperature contrast is condensed once again and accumulates near the exit position, runner duct. Main operation is such as figure Shown in 6, the waste gas of industry discharging is divided into two circuits and enters runner, wherein the 60-of air quantity 95% enters adsorption zone by pipeline (1), carries out adsorption treatment, and purified gas is by (5) Be disposed in the atmosphere, the 5-40% of air quantity then enters blowing of runner by pipeline (2) in addition The cold-zone, below the adsorbent blast-cold to 45 ℃ after the regeneration, the gas of discharge is by pipeline (6) Enter the preheating zone, the saturated part runner of absorption is preheated between 60-100 ℃, (enter Gas flow before the preheating zone can be optionally with a heat exchanger heats between 60-120 ℃), The gas (4) of discharging can merge with (3) directly sends into the rear places such as incineration system or solvent recovery The reason system. The blast-cold gas of part then enters heat exchanger 12, is heated to 120-After between 250 ℃, enter the desorption district with the saturated adsorbent of regeneration absorption, the concentrated gas of desorption Body (3) is then directly sent into equipment for after-treatment.
Advantage of the present invention is to improve the efficient of desorption, and then promotes the performance of reproducing adsorbent, Make to be suitable for long period of operation, can guarantee that not only the long period of operation emission gases can meet the regulation of environmental protection, And can prolong the life-span of adsorbent (or runner). In addition, because direct control on the line does not have two The doubt of inferior pollution; In addition, take full advantage of used heat, can save the energy consumption of operation, do not have again in a large number molten Agent is accumulated in the exit position, causes the puzzlement of runner catching fire. System of the present invention be particularly suitable for into The exhaust-gas treatment of row Wind Volume is because runner is adopted honey comb like drill way layout, even under high flow rate Operation does not still have the too high problem of Pressure Drop, and the linear velocity of gas-operated can be generally fixed The 5-10 of adsorbent bed times, to be advisable between 0.3 meter per second-5 meter per second, wherein with 0. 3 meter per seconds-3.5 meter per second the best; Area two halves centered by the runner axle center that adsorption zone is shared Angle angle 180 degree that open in the footpath are advisable between 330 degree, and the preheating zone is then with the angle angle Degree 10-120 degree is advisable, and the angle angle of renewing zone is advisable with the 10-120 degree, blows Be advisable with angle angle 10-72 degree in the cold-zone, the adsorbent of wheel surface coating can be zeolite, Or activated carbon, or resin, or laminated soil, or silica gel etc. Another benefit of the present invention is preheating Gas is carried in district and desorption district, can be the waste gas of industry discharging, or air, or not live The nitrogen of property all has identical benefit for it. System of the present invention can be as various mists dense Contracting is processed, or recycling usefulness, and its treatment effeciency all more traditional runner promotes more than 10%, Especially when processing emission gases composition includes higher-boiling compound matter, all can keep for a long time the utmost point High removal efficient. Times number average design of general concentration solvent gas explosive range lower limit with Lower. The waste gas that discharges with industry when therefore using as concentrating and treating system is as blast-cold district, desorption District and preheating zone to carry gas the most economical, general treatment effeciency can reach more than 95%. Especially When it includes the higher boiling chemical substance at processing discharging waste gas composition, still can keep clearance to exist More than 95%. During as solvent recovering system, because all operating in high concentration range, then with nitrogen Gas is advisable as the gas that carries of blast-cold district or desorption district or preheating zone, and treatment effeciency also can reach More than 95%.
Be convenient understanding superiority of the present invention, specify for example that below the present invention promotes the characteristic that runner type adsorption system is removed the volatile organic waste gas efficiency method, the relative dimensions of each testing equipment is shown in the embodiment.The industry exhaust gas discharged is with GC, and (THC, FID) grade is carried out qualitative and be quantitative for GC-MASS and full carbon-hydrogen analyzer.Removal efficient in the embodiment is calculated according to following formula (1), and cycles of concentration calculates according to following formula (2).Following all examples are only for being used for representative special case of the present invention.Yet scope of the present invention is not limited to these embodiment. (1)
* following all concentration are basic calculation with the THC analysis result all
Embodiment one
The waste gas of certain industry hydrocarbon to contain (THC) analyzer continuous monitoring result, its concentration changes between 300ppm-1000ppm.Include methyl-sulfoxide 0-15ppm through irregularly sampling with gas chromatograph analysis result composition, monoethanolamine 20-3ppm, N-methyl one pyrrole noise made in coughing or vomiting ketone 0-10ppm, DMDS alcohol 0.5-10ppm, ethylene glycol 5-20ppm, isopropyl alcohol 20-200ppm, the waste gas air quantity is 55000 cubic metres/hour, delivery temperature is between 30-50 ℃, through being 3900mm with diameter as shown in Figure 6, thickness is that the zeolite runner adsorption system of 400mm is handled, wherein the shared area of adsorption zone is the areal extents of 270 degree with the rotating shaft by the open angle number of degrees of center two radius, the folded angle number of degrees in preheating zone are 30 degree, the folded angle number in desorption district is 30 degree, and the folded angle number of degrees in blast-cold district are 30 degree, and wherein one waste gas enters the runner adsorption zone with 49000 cubic metres/hour speed, through adsorption treatment after smoke stack emission to atmosphere, the initial stage exhaust is 99% through the result treatment benefit with the analysis of THC analyzer.Another strand air quantity is the blast-cold district that 6000 cubic metres/hour waste gas then imports runner, exhaust after tested as a result temperature be 105 ℃, saturated runner heating will be adsorbed in the direct preheating zone that imports runner again of this strand gas stream, the gas that flows out the preheating zone analysis result temperature of flowing through is 70 ℃, and exhaust gas concentration is between the 360ppm-1200ppm; The gas stream that flows out preheating imports the desorption district again after a heat exchanger heats to 180 ℃, will the saturated adsorbent desorption and regeneration of absorption on the runner, the waste gas behind the desorption by analysis as a result temperature be 160 ℃, cycles of concentration is 10.Through continued operation 3 months, the removal efficient of adsorption zone was between the 98%-99% through the continuous monitoring analysis result.
Embodiment two
Certain industry waste gas is with full carbon-hydrogen analyzer (THC) continuous monitoring result, its concentration changes by analysis between 30-600ppm, and its composition includes isopropyl alcohol, acetone, trimethyl silanol, toluene and tetramethyl two silicon ammoniums, the waste gas air quantity is 25000 cubic metres/hour, delivery temperature is that 40 ℃ of warps are 2500mm with a diameter, thickness is that the zeolite runner of 300mm carries out concentration, wherein the shared area of adsorption zone is to be that two radius open angle 300 degree in center are adsorption zone with the rotating shaft, the preheating zone, the angle in desorption district and blast-cold district then is respectively 20 degree, wherein one waste gas enters the runner adsorption zone with 22000 cubic metres/hour, the exhaust warp is with the THC analysis result, and clearance is 96%.Another strand waste gas then enters the blast-cold district with 3000 cubic metres/hour speed, the blast-cold gas of the discharging analysis result of flowing through is 80 ℃, carry out The pre-heat treatment through directly importing the preheating zone, the exhaust of preheating zone as a result result by analysis is 55 ℃, exhaust concentration is to change between the 350-700ppm, and this strand gas stream imports the desorption district more again after a heat exchanger heats to 160 ℃, carry out the desorption and regeneration of wheel surface adsorbent, desorption gas is cycles of concentration 15 as a result by analysis, and temperature is 150 ℃.This cover system was through continued operation 5 months, and the removal efficient of adsorption zone changes between 95-98% through the continuous monitoring analysis result.
Embodiment three
Certain industry waste gas with full carbon-hydrogen analyzer (THC) continuous monitoring as a result concentration between 3000-15000ppm, change, include the Methylethyl rim through forming, first is stupid and dimethyl is sent out amine with the gas chromatograph analysis result.The waste gas air quantity is 7000 cubic metres/hour, delivery temperature is 80 ℃, waste gas is after being cooled to 35 ℃, warp is 1500mm with the diameter, thickness is that the adsorption system of the activated carbon runner of 40mm reclaims, and warp is to carry out exhaust-gas treatment as embodiment one identical method, and equipment for after-treatment then changes solvent recovery into, the angle that other changes adsorption zone is 330 degree, and the angle in preheating, desorption, blast-cold district is respectively 10 degree.Wherein 7000 cubic metres/hour waste gas stream imports adsorption zone fully, purify back gas by analysis the result to remove efficient be 95%.Another strand nitrogen enters the blast-cold district with 200 cubic metres/hour speed, and with the adsorbent cooling after the regeneration, exhaust result by analysis is 50 ℃, after a heat exchanger heats to 70 ℃, enters the preheating zone.The exhaust of preheating zone result by analysis is 60 ℃, and exhaust concentration is between 3500-18000ppm.This strand air-flow after a heat exchanger heats to 130 ℃, enters the desorption district and carries out desorption and regeneration again.The exhaust in desorption district by analysis as a result temperature be 115 ℃, cycles of concentration is 35.Concentrated gas is recyclable methyl ethyl ketone, toluene and dimethyl thiamines behind a condenser.This cover system through the removal efficient of 3 months adsorption zones of continued operation between 95-97%.Comparative example one
Form with the identical waste gas of embodiment one and onesize zeolite runner carries out waste gas and concentrates the place and bury, only change the absorption that is designed to of runner, three zones of desorption and blast-cold, wherein adsorb shared area and be angle 300 degree scopes with the runner axle center, blast-cold and desorption then respectively are 30 degree, wherein one waste gas enters adsorption zone with 49000 cubic metres of/hour speed, the initial stage purifying exhaust gas by analysis the result to remove efficient be 98%, another strand waste gas directly imports the blast-cold district with 6000 cubic metres of/hour speed, the blast-cold exhaust is the result by analysis, temperature is 105 ℃, after a heat exchanger heats to 180 ℃, import the desorption district again, carry out the regeneration of wheel surface adsorbent, desorption gas by analysis as a result temperature be 50 ℃, cycles of concentration is 8 times.After 3 months, it is 87% that decrease in efficiency is removed in the purification of adsorption zone to this cover system through continued operation, finds that through shutdown inspection the outlet side accumulation in runner desorption district has yellow liquid material, is methyl-sulfoxide and monoethanolamine through the GC-MASS qualification result.
By the result of embodiment one, two, three and comparative example one the inventive method as can be known, not only can promote the runner adsorption system maintenance of VOC long-term disposal is removed efficient more than 95%, and can increase the operation lifetime of runner.In addition by embodiment three as can be known this cover system can improve runner and use as solvent recovery.

Claims (6)

1. one kind promotes the method that runner type adsorption system is removed volatile organic waste gas efficient, it is characterized in that runner is divided between absorption, preheating, desorption and four operating spaces of blast-cold, utilize the warm-up cycle mode to carry out the method that processing or solvent recovery processing are removed in waste gas absorption; The gas temperature that carries of its preheating zone is between 60-120 ℃; The gas that carries of its preheating zone is directly led people's desorption district, or imports the desorption district after heat exchanger heats again.
2. a kind of method that runner type adsorption system is removed volatile organic waste gas efficient that promotes according to claim 1 is characterized in that the gas that carries of its preheating zone can be the industry exhaust, or air, or nitrogen, or other active gases not.
3. a kind of method that runner type adsorption system is removed volatile organic waste gas efficient that promotes according to claim 1, it is characterized in that, its runner pattern is wheeled or drum type brake, with ceramic fibre, or carbon fiber, or macromolecular fibre is a base material, the surface is coated with zeolite, or activated carbon, or laminated soil, or polymeric sorbent.
4. a kind of method that runner type adsorption system is removed volatile organic waste gas efficient that promotes according to claim 1, it is characterized in that, the area of its adsorption zone for the runner axle center by the open angle angle of center two radius be 180 to 330 spend between included areal extent; The areal extent in preheating zone and desorption district respectively is an angle angle 10-120 degree; The areal extent in blast-cold district is the 10-72 degree for the angle angle.
5. a kind of method that runner type adsorption system is removed volatile organic waste gas efficient that promotes according to claim 1 is characterized in that, waste gas is that the speed with 0.3 meter per second-5 meter per second enters runner.
6. a kind of method that runner type adsorption system is removed volatile organic waste gas efficient that promotes according to claim 1 is characterized in that its equipment for after-treatment can be incineration process or solvent recovering system.
CN99109004A 1999-06-11 1999-06-11 Method of raising the efficiency of runner type adsorption system in eliminating volatile organic waste gas Expired - Lifetime CN1089262C (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI686233B (en) * 2018-10-30 2020-03-01 華懋科技股份有限公司 Runner system with high temperature desorption and its method

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Publication number Priority date Publication date Assignee Title
CN100460040C (en) * 2006-12-04 2009-02-11 何金星 Apparatus for recovering and purifying volatile organic compound from waste gas and its application
CN103007682B (en) * 2012-12-03 2014-06-18 北汽(广州)汽车有限公司 Waste gas treatment method and system of coating workshop based on concentrated runner and RTO (regenerative thermal oxidizer)
KR101887478B1 (en) * 2017-05-10 2018-08-10 주식회사 신성이엔지 Voc reduction system

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