CN209968025U - Benzene series tail gas treatment system - Google Patents
Benzene series tail gas treatment system Download PDFInfo
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Abstract
The utility model relates to a benzene series thing tail gas processing system, including spraying absorption tower, adsorption unit, adsorption column regeneration vacuum pump and desorption condenser, the liquid that sprays in the absorption tower passes through the cooling of absorption liquid cooler, it passes through pipe connection adsorption unit bottom entry to spray absorption tower ejection opening, adsorption unit bottom entry is connected with the desorption condenser, adsorption column regeneration vacuum pump sets up between desorption condenser and adsorption unit or after the desorption condenser. The utility model discloses utilize the mode of low temperature spray absorption + vacuum desorption condensation to realize that benzene series thing rate of recovery is up to more than 98%, and tail gas discharge to reach standard, the investment is lower with the working costs.
Description
Technical Field
The utility model relates to a benzene series thing tail gas treatment system belongs to environmental protection VOC and administers the field.
Background
Benzene series tail gas is toxic and harmful gas generated in various chemical production processes, wherein benzene series refers to benzene, toluene, xylene, ethylbenzene, styrene and the like, the waste gas has high toxicity, and after the benzene series tail gas is contacted for a long time, the benzene series tail gas is absorbed into a body through breathing or skin, so that liver damage, hematopoietic organ and nervous system damage can be caused, and aplastic anemia can be developed in a later stage and even leukemia can be developed. Especially, benzene is more toxic and is easy to accumulate because of slow metabolism in human body. As the national environmental protection policy becomes stricter and the environmental awareness of people increases, the standard discharge of benzene series becomes a more and more urgent problem.
At present, the benzene series tail gas is generally treated by a combustion method, a catalytic oxidation method, an adsorption method and deep cooling and adsorption. The combustion method needs natural gas for combustion supporting and consumes larger natural gas, and the benzene series belongs to flammable and explosive chemical substances and has larger safety risk. The current temperature of the catalytic oxidation method is 150-. The adsorption method is a more common method, and the simple adsorption has the following defects: 1. the tail gas is difficult to reach the standard; 2. the required adsorbent amount is large, the requirement on the adsorbent is high, and the released heat is difficult to remove in time due to the excessive adsorption amount, so that a large safety risk exists; 3. after the styrene in the tail gas is adsorbed, the risk of blocking the adsorption column due to polymerization exists. The method of deep cooling and adsorption solves the problem of overlarge adsorption quantity, simultaneously greatly reduces the adsorbent quantity, but has larger deep cooling energy consumption, benzene can be solidified at 5.5 ℃, and styrene and dimethylbenzene can be solidified in a deep cooling state, thereby having the risk of blocking a pipeline. Therefore, a safe, economical, reliable and stable benzene series tail gas treatment system is a very important and urgent problem at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough, provide a benzene series thing tail gas processing system, utilize the low temperature to spray the mode of absorbing + absorption + vacuum desorption condensation and realize that benzene series thing rate of recovery is up to more than 98%, and tail gas emission to reach standard, the investment is lower with the working costs.
The purpose of the utility model is realized like this:
the utility model provides a benzene series thing tail gas processing system, is including spraying absorption tower, adsorption unit, adsorption column regeneration vacuum pump and desorption condenser, the liquid that sprays in the absorption tower is cooled off through the absorption liquid cooler, it passes through pipe connection adsorption unit bottom entry to spray absorption tower top exit, adsorption unit bottom entry is connected with the desorption condenser, adsorption column regeneration vacuum pump sets up between desorption condenser and adsorption unit or behind the desorption condenser.
Preferably, the adsorption unit is provided with one or more adsorption columns.
Preferably, the adsorption unit is provided with a first adsorption column and a second adsorption column, the first adsorption column and the second adsorption column are arranged in parallel, the spray liquid in the spray adsorption tower is cooled by an absorption liquid cooler, the top outlet of the spray adsorption tower is respectively connected with the bottom inlet of the first adsorption column and the bottom inlet of the second adsorption column through pipelines, the bottom inlet of the first adsorption column and the bottom inlet of the second adsorption column are respectively connected with an adsorption column regeneration vacuum pump, and the adsorption column regeneration vacuum pump is connected with a desorption condenser.
Preferably, the adsorption unit is provided with a plurality of layers of fillers, and the water removing layer, the first-stage organic matter removing layer and the second-stage organic matter removing layer are sequentially arranged from bottom to top, the water removing layer is filled with the water absorbing molecular sieve, the first-stage organic matter removing layer is filled with the hydrophobic silica gel and the hydrophobic zeolite molecular sieve, and the second-stage organic matter removing layer is filled with the activated carbon.
Preferably, the weight ratio of the water absorption molecular sieve, the hydrophobic silica gel and the hydrophobic zeolite molecular sieve mixture to the active carbon is 1-2:10:2-3, wherein the weight ratio of the hydrophobic zeolite molecular sieve to the hydrophobic silica gel is 1: 2-4.
The utility model has the advantages that:
the utility model discloses benzene series thing more than 98% in the recoverable tail gas makes tail gas discharge to reach standard simultaneously, realizes the economic and social of energy-conservation, environmental protection.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein: a spray absorption tower 1; a first adsorption column 2; a second adsorption column 3; an adsorption column regenerative vacuum pump 4; a desorption condenser 5; a conduit 6.
Detailed Description
Referring to fig. 1, the utility model relates to a benzene series tail gas processing system, including spraying absorption tower 1, adsorption unit, adsorption column regeneration vacuum pump 4 and desorption condenser 5, the liquid that sprays in the absorption tower 1 is cooled off through absorption liquid cooler 6, the export of spraying absorption tower 1 top of the tower is passed through pipeline 6 and is connected the adsorption unit bottom entry, the adsorption unit bottom entry is connected with desorption condenser 5, adsorption column regeneration vacuum pump 4 sets up between desorption condenser 5 and adsorption unit or after desorption condenser 5.
The adsorption unit is provided with one or more adsorption columns.
The adsorption unit is provided with a first adsorption column 2 and a second adsorption column 3, the first adsorption column 2 and the second adsorption column 3 are arranged in parallel, spray liquid in the spray adsorption column 1 is cooled by an absorption liquid cooler 6, an outlet at the top of the spray adsorption column 1 is respectively connected with an inlet at the bottom of the first adsorption column 2 and an inlet at the bottom of the second adsorption column 3 through a pipeline 6, an inlet at the bottom of the first adsorption column 2 and an inlet at the bottom of the second adsorption column 3 are respectively connected with an adsorption column regeneration vacuum pump 4, and the adsorption column regeneration vacuum pump 4 is connected with a desorption condenser 5.
The first adsorption column 2 and the second adsorption column 3 are identical in structure and are provided with multiple layers of fillers, a water removing layer, a first-level organic matter removing layer and a second-level organic matter removing layer are sequentially arranged from bottom to top, the water removing layer is filled with a water absorbing molecular sieve, the particle size of the water absorbing molecular sieve is 3-5mm, the first-level organic matter removing layer is filled with hydrophobic silica gel and a hydrophobic zeolite molecular sieve, the particle size of the hydrophobic silica gel or the hydrophobic zeolite molecular sieve is 1-6mm, the second-level organic matter removing layer is filled with active carbon, and the active carbon is columnar or spherical. The weight ratio of the water absorption molecular sieve to the hydrophobic silica gel to the mixture of the hydrophobic zeolite molecular sieve and the hydrophobic silica gel is 1-2:10:2-3, wherein the weight ratio of the hydrophobic zeolite molecular sieve to the hydrophobic silica gel is 1:2-4, the water absorption molecular sieve aims to remove a small amount of water in tail gas, the water can have a large influence on rear-end active carbon, the active carbon is difficult to avoid pulverization in the filling process, the pulverized active carbon has stronger adsorption capacity and is more prone to catch fire or explode, and if the water is not removed, the heat generated by the water adsorbed by the partially pulverized active carbon can possibly cause fire or explode. The hydrophobic silica gel or hydrophobic zeolite molecular sieve aims at removing most benzene series in tail gas; and a small amount of final benzene series adsorbed by the activated carbon is subjected to activated carbon adsorption and then reaches the standard to be discharged. The mainstream method for treating the benzene series tail gas at present is to remove water by adopting a cryogenic method, and the method has the advantages that the water and the benzene series can be simultaneously removed by cryogenic cooling, but has the defect of huge energy consumption. The molecular sieve is expensive when all hydrophobic silica gel or hydrophobic zeolite is adopted.
A benzene series tail gas treatment method adopts the system, and the benzene series tail gas treatment method comprises the following steps:
step one, cooling the spray liquid to 7-10 ℃ through an absorption liquid cooler, spraying the spray liquid from the top of a spray absorption tower, allowing benzene series tail gas to enter the spray absorption tower from the bottom of the spray absorption tower to perform mass and heat transfer exchange with the spray liquid, absorbing more than 90% of the benzene series tail gas, discharging the benzene series tail gas from the bottom of the spray absorption tower, and recovering materials of all components after rectification and separation;
step two, discharging the rest unabsorbed benzene series tail gas from the tower top, and carrying out jacket cold insulation through a pipeline to enter an adsorption unit for further adsorption;
step three, performing vacuum desorption after the adsorption unit is saturated;
and step four, recovering the desorbed organic matters through a desorption condenser, and discharging the standard-reaching tail gas through the tops of the adsorption columns.
And in the third step, when the adsorption unit is provided with the first adsorption column and the second adsorption column, switching to the second adsorption column for adsorption after the first adsorption column is subjected to adsorption saturation, wherein the first adsorption column is in a desorption regeneration state at the moment, performing vacuum desorption on the first adsorption column, and alternately operating the first adsorption column and the second adsorption column.
The temperature of a tail gas outlet of the desorption condenser is controlled to be 6-7 ℃, and the benzene is prevented from being condensed and frosted to block a pipeline.
The adsorption unit adopts shell and tube, fin, shell and tube and fin combined heat exchange, the temperature in the adsorption column is 15-25 ℃ during adsorption, the temperature in the adsorption column is 25-50 ℃ during desorption, and vacuum desorption (within 2 kPa) is adopted for desorption, so that the risk of explosion and internal combustion caused by high-temperature heating (more than 100 ℃) in the conventional desorption is avoided.
And in the first step, the spray liquid is one or a mixture of more of ethylbenzene, polyethylbenzene and field rectification raffinate. After the spraying liquid is sprayed and absorbed at a low temperature of 7-10 ℃, the total amount of voc in the tail gas can be reduced by 70-95%, particularly the total amount of benzene and styrene can be reduced by more than 99%, the benzene and styrene have higher requirements on the adsorbent, and the benzene is easy to adsorb and difficult to desorb, so a special adsorbent is needed and has high price, and the styrene is mainly polymerized due to heat generated in the adsorption process. The ethylbenzene, the polyethylbenzene and the field rectification raffinate are adopted, so that the ethylbenzene, the polyethylbenzene and the field rectification raffinate have relatively low saturated vapor pressure, no new impurity is introduced, local materials are used for most chemical enterprises, and spray liquid does not need to be purchased; the purpose of low temperature is to reduce the saturated vapor pressure of the spray liquid (ethylbenzene or polyethylbenzene or field distillation raffinate) and reduce the load for subsequent adsorption treatment.
Example 1:
the benzene series tail gas comprises 15% of benzene, 3% of ethylbenzene, 3% of styrene, 1% of toluene, 1% of xylene, 1% of water and the balance of air or nitrogen, the spraying liquid is one or a mixture of ethylbenzene, polyethylbenzene and on-site rectification residual liquid, the temperature of the spraying liquid is 7 ℃, the benzene series tail gas with the temperature of 35 ℃ is subjected to low-temperature spraying absorption treatment by a spraying absorption tower 1, and the content of each component is respectively 0.05-0.1% of benzene, 2% of ethylbenzene, 0.005-0.01% of styrene, 0.005-0.01% of toluene, 0.005-0.01% of xylene and 1% of water;
the adsorption unit is equipped with first adsorption column 2 and second adsorption column 3, first adsorption column 2 and 3 structures of second adsorption column are the same, all are equipped with the multilayer filler, and from the bottom up removes water layer, one-level and removes organic matter layer and second grade in proper order and removes organic matter layer, it absorbs water the molecular sieve to remove water layer packing, it is 3-5mm to absorb water the molecular sieve particle size, the one-level removes organic matter layer packing hydrophobic silica gel and hydrophobic zeolite molecular sieve, the particle size of hydrophobic silica gel and hydrophobic zeolite molecular sieve is 5mm, the second grade removes organic matter layer packing active carbon, the active carbon is the column. The weight ratio of the water absorption molecular sieve, the mixture of the hydrophobic silica gel and the hydrophobic zeolite molecular sieve and the activated carbon is 1:10:2, wherein the weight ratio of the hydrophobic zeolite molecular sieve to the hydrophobic silica gel is 1:2, the temperature in an adsorption column during adsorption is 15-25 ℃, the temperature in the adsorption column during desorption is 25-50 ℃, after adsorption treatment by the first adsorption column, the water content is less than 100ppm, the benzene content in tail gas from the top of the first adsorption column is less than 2ppm, the ethylbenzene content is less than 10ppm, the styrene content is less than 5ppm, the xylene content is less than 5ppm, and the xylene content is less than 5 ppm.
One or more indexes (benzene is less than or equal to 3 mg/m) of tail gas at the top of the first adsorption column3Styrene is less than or equal to 10mg/m3Ethylbenzene is less than or equal to 50mg/m3(ii) a Xylene is less than or equal to 10mg/m3(ii) a Toluene is less than or equal to 5mg/m3) And after exceeding the standard, starting a regenerative vacuum pump, opening a desorption regeneration valve, closing a tail gas inlet valve, enabling the tail gas to enter a second adsorption column, automatically opening the adsorption tower by heating hot water, interlocking with the temperature in the adsorption column, keeping the temperature in the adsorption column at 30-40 ℃, opening the cooling water of a desorption condenser, performing condensation regeneration on the desorption tail gas, and completing regeneration after 5 hours. And waiting for the second adsorption column to be saturated. The first adsorption column and the second adsorption column are alternately carried out for 1-2 times, so that the continuous treatment of tail gas is ensured.
Example 2:
the benzene series tail gas comprises 15% of benzene, 3% of ethylbenzene, 3% of styrene, 1% of toluene, 1% of xylene, 1% of water and the balance of air or nitrogen, the spraying liquid is one or a mixture of ethylbenzene, polyethylbenzene and on-site rectification residual liquid, the temperature of the spraying liquid is 10 ℃, the benzene series tail gas with the temperature of 35 ℃ is subjected to low-temperature spraying absorption treatment by a spraying absorption tower 1, and the content of each component is 0.05-1%, 0.2-2.8% of ethylbenzene, 0.009-0.01% of styrene, 0.006-0.01% of toluene, 0.005-0.01% of xylene and 1% of water respectively;
One or more indexes (benzene is less than or equal to 3 mg/m) of tail gas at the top of the first adsorption column3Styrene is less than or equal to 10mg/m3Ethylbenzene is less than or equal to 50mg/m3(ii) a Xylene is less than or equal to 10mg/m3(ii) a Toluene is less than or equal to 5mg/m3) And after exceeding the standard, starting a regenerative vacuum pump, opening a desorption regeneration valve, closing a tail gas inlet valve, enabling the tail gas to enter a second adsorption column, automatically opening the adsorption tower by heating hot water, interlocking with the temperature in the adsorption column, keeping the temperature in the adsorption column at 30-40 ℃, opening the cooling water of a desorption condenser, performing condensation regeneration on the desorption tail gas, and completing regeneration after 5 hours. And waiting for the second adsorption column to be saturated. The first adsorption column and the second adsorption column are alternately carried out for 1-2 times, so that the continuous treatment of tail gas is ensured.
Example 3:
the benzene series tail gas comprises 15% of benzene, 3% of ethylbenzene, 3% of styrene, 1% of toluene, 1% of xylene, 1% of water and the balance of air or nitrogen, the spraying liquid is one or a mixture of ethylbenzene, polyethylbenzene and on-site rectification residual liquid, the temperature of the spraying liquid is 8 ℃, the benzene series tail gas with the temperature of 35 ℃ is subjected to low-temperature spraying absorption treatment in a spraying absorption tower 1, and the content of each component is respectively 0.05-0.08% of benzene, 0.2-2.3% of ethylbenzene, 0.009-0.01% of styrene, 0.01-0.02% of toluene, 0.006-0.01% of xylene and 1% of water;
One or more indexes (benzene is less than or equal to 3 mg/m) of tail gas at the top of the first adsorption column3Styrene is less than or equal to 10mg/m3Ethylbenzene is less than or equal to 50mg/m3(ii) a Xylene is less than or equal to 10mg/m3(ii) a Toluene is less than or equal to 5mg/m3) And after exceeding the standard, starting a regenerative vacuum pump, opening a desorption regeneration valve, closing a tail gas inlet valve, enabling the tail gas to enter a second adsorption column, automatically opening the adsorption tower by heating hot water, interlocking with the temperature in the adsorption column, keeping the temperature in the adsorption column at 30-40 ℃, opening the cooling water of a desorption condenser, performing condensation regeneration on the desorption tail gas, and completing regeneration after 5 hours. And waiting for the second adsorption column to be saturated. The first adsorption column and the second adsorption column are alternately carried out for 1-2 times, so that the continuous treatment of tail gas is ensured.
Comparative example 1:
the same as example 1, except that the spray absorber 1 uses high boiling point diesel oil to absorb spray at normal temperature. Compared with the example 1, the new impurity (diesel oil) is introduced, and the benzene series materials in the absorbed spray liquid rich in the benzene series are difficult to recover; meanwhile, diesel oil needs to be purchased externally, and the cost is additionally increased.
Comparative example 2:
same as example 1 except that the spraying temperature of the spray liquid was 12 ℃. Compared with the embodiment 1, the pressure of the adsorption column is large, the adsorption column is difficult to discharge after reaching the standard after running for a period of time, heat generated by the adsorption column is difficult to remove in time, and safety risk exists.
Comparative example 3:
same as example 1 except that the spraying temperature of the spray liquid was 3 ℃. Compared with the embodiment 1, the comparative example has high energy consumption, the benzene content in the tail gas is high and low in the actual operation process, and when the benzene content in the tail gas is high and the benzene content at the top of the spray absorption tower is high, benzene vapor can freeze in a pipeline at the top of the tower to block the pipeline, so that the operation risk is greatly increased.
Comparative example 4:
same as example 1 except that only activated carbon was packed in the adsorption column. After the benzene series tail gas is subjected to low-temperature spray absorption treatment in a spray absorption tower 1, the contents of the components are respectively 0.1-0.2% of benzene, 0.2-2% of ethylbenzene, 0.01-0.03% of styrene, 0.01-0.02% of toluene, 0.01-0.02% of dimethylbenzene and 1% of water;
after adsorption treatment by the first adsorption column, the temperature in the adsorption column rises to more than 60 ℃, the local temperature may exceed 100 ℃, and the temperature is high and is not beneficial to adsorption, so that the tail gas benzene from the top of the first adsorption column is 0.05-0.1%, ethylbenzene is 0.1-0.3%, styrene is 0.005-0.01%, toluene is 0.005-0.01%, xylene is 0.005-0.01%, moisture is 100ppm, the tail gas does not reach the standard, and the safety risk is greatly increased.
Comparative example 5:
the same as example 1 except that the first organic-removing layer was filled with only hydrophobic zeolite molecular sieve. After the benzene series tail gas is subjected to low-temperature spray absorption treatment in a spray absorption tower 1, the contents of the components are respectively 0.1-0.2% of benzene, 0.2-2% of ethylbenzene, 0.01-0.03% of styrene, 0.01-0.02% of toluene, 0.01-0.02% of dimethylbenzene and 1% of water;
after the adsorption treatment of the first adsorption column, the tail gas from the top of the first adsorption column is 20-50ppm of benzene, 100ppm of ethylbenzene, 50-100ppm of styrene, 5-20ppm of xylene and 0.8% of water, and the tail gas emission is difficult to reach the standard.
Comparative example 6:
same as example 1 except that the first organic-removing layer was filled with only hydrophobic silica gel. The benzene-based compound had similar treatment effect to example 1, but was expensive.
Comparative example 7:
the same as example 1 except that the weight ratio of hydrophobic zeolitic molecular sieve to hydrophobic silica gel was 1: 1. After the benzene series tail gas is subjected to low-temperature spray absorption treatment in a spray absorption tower 1, the contents of the components are respectively 0.1-0.2% of benzene, 0.2-2% of ethylbenzene, 0.01-0.03% of styrene, 0.01-0.02% of toluene, 0.01-0.02% of dimethylbenzene and 1% of water;
after the adsorption treatment of the first adsorption column, the benzene in the tail gas coming out of the top of the first adsorption column is less than 6ppm, the ethylbenzene is less than 15ppm, the styrene is less than 5ppm, the xylene is less than 8ppm, and the xylene is less than 5 ppm. The tail gas is difficult to reach the standard and be discharged.
To sum up, the utility model discloses tail gas treatment effect is best, and factor of safety is the highest, and benzene series thing rate of recovery is up to more than 98%, and economical and practical more is applicable to industrial production.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (5)
1. The utility model provides a benzene series thing tail gas processing system which characterized in that: including spraying absorption tower (1), adsorption unit, adsorption column regeneration vacuum pump (4) and desorption condenser (5), the liquid that sprays in the absorption tower (1) cools off through absorption liquid cooler (6), it passes through pipe connection adsorption unit bottom entry to spray absorption tower (1) top of the tower export, the adsorption unit bottom entry is connected with desorption condenser (5), adsorption column regeneration vacuum pump (4) set up between desorption condenser (5) and adsorption unit or after desorption condenser (5).
2. The benzene series tail gas treatment system of claim 1, characterized in that: the adsorption unit is provided with one or more adsorption columns.
3. The benzene series tail gas treatment system according to claim 2, characterized in that: the adsorption unit is provided with a first adsorption column (2) and a second adsorption column (3), the first adsorption column (2) and the second adsorption column (3) are arranged in parallel, spray liquid in the spray absorption tower (1) is cooled by an absorption liquid cooler (6), an outlet at the top of the spray absorption tower (1) is respectively connected with an inlet at the bottom of the first adsorption column (2) and an inlet at the bottom of the second adsorption column (3) through pipelines, an inlet at the bottom of the first adsorption column (2) and an inlet at the bottom of the second adsorption column (3) are respectively connected with an adsorption column regeneration vacuum pump (4), and the adsorption column regeneration vacuum pump (4) is connected with a desorption condenser (5).
4. The benzene series tail gas treatment system of claim 1, characterized in that: the adsorption unit is provided with a plurality of layers of fillers, and the water removing layer, the first-stage organic matter removing layer and the second-stage organic matter removing layer are sequentially arranged from bottom to top, the water removing layer is filled with the water absorbing molecular sieve, the first-stage organic matter removing layer is filled with the hydrophobic silica gel and the hydrophobic zeolite molecular sieve, and the second-stage organic matter removing layer is filled with the activated carbon.
5. The benzene series tail gas treatment system according to claim 4, characterized in that: the weight ratio of the water absorption molecular sieve, the mixture of the hydrophobic silica gel and the hydrophobic zeolite molecular sieve to the active carbon is 1-2:10:2-3, wherein the weight ratio of the hydrophobic zeolite molecular sieve to the hydrophobic silica gel is 1: 2-4.
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| CN109999607A (en) * | 2019-04-10 | 2019-07-12 | 江苏双良低碳产业技术研究院有限公司 | A kind of benzene homologues exhaust treatment system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109999607A (en) * | 2019-04-10 | 2019-07-12 | 江苏双良低碳产业技术研究院有限公司 | A kind of benzene homologues exhaust treatment system and method |
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