CN215962860U - Oil gas treatment system - Google Patents
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- CN215962860U CN215962860U CN202121306563.5U CN202121306563U CN215962860U CN 215962860 U CN215962860 U CN 215962860U CN 202121306563 U CN202121306563 U CN 202121306563U CN 215962860 U CN215962860 U CN 215962860U
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Abstract
The utility model relates to the technical field of industrial VOC (volatile organic compound) treatment systems, in particular to an oil gas treatment system which can treat oil gas with complex components, effectively reduce the oil content in the oil gas, meet the oil gas emission standard, improve the treatment effect on the oil gas and improve the practicability; including low temperature diesel oil cleaning unit, degree of depth condensation unit and active carbon fiber absorption unit, low temperature diesel oil cleaning unit input is provided with first tail gas import, low temperature diesel oil cleaning unit input is provided with spark arrester and first control valve, low temperature diesel oil cleaning unit output is provided with first output tube, first output tube output is through first communicating pipe and degree of depth condensation unit intercommunication, and be provided with second tail gas import and accident delivery pipe on first communicating pipe, be provided with buffer tank and third control valve on the second communicating pipe, active carbon fiber absorption unit output is provided with the blast pipe.
Description
Technical Field
The utility model relates to the technical field of industrial VOC (volatile organic compound) treatment systems, in particular to an oil gas treatment system.
Background
As is well known, in the production and transportation process of the refining and chemical industry, a large amount of oil gas can be generated, including tank area breathing oil gas, platform loading oil gas, dock unloading oil gas and the like, which relate to crude oil, gasoline and diesel oil, aviation kerosene, wax oil, asphalt and the like, and the emission of the oil gas is the subject of national key supervision, and the emission standard of the oil gas is more and more strict, such as the local standard of Shandong province: DB37/2801.6-2018 volatile organic emission Standard part 6: in the organic chemical industry, the emission standard of non-methane total hydrocarbon is improved to 60mg/m3The existing oil gas treatment method generally adopts condensation treatment, the temperature of the condensation treatment is generally-75 ℃, and an activated carbon adsorption technology is adopted, but the technologies are generally only suitable for the treatment of oil gas with simple components, but when the oil gas with complex components such as crude oil, wax oil and the like generated in the existing refining industry is treated, the treated gas hardly reaches the standard, so that the treatment effect is poor, and the practicability is poor.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the defects of the prior art, the utility model provides the oil-gas treatment system which can treat oil gas with more complex components, effectively reduce the oil content in the oil-gas, meet the oil-gas emission standard, improve the oil-gas treatment effect and improve the practicability.
(II) technical scheme
In order to achieve the purpose, the utility model provides the following technical scheme: an oil gas treatment system comprises a low-temperature diesel oil cleaning unit, a deep condensation unit and an activated carbon fiber adsorption unit, wherein a first tail gas inlet is formed in the input end of the low-temperature diesel oil cleaning unit, a flame arrester and a first control valve are arranged at the input end of the low-temperature diesel oil cleaning unit, a first output pipe is arranged at the output end of the low-temperature diesel oil cleaning unit, a first draught fan is arranged on the first output pipe, the output end of the first output pipe is communicated with the deep condensation unit through a first communicating pipe, a second tail gas inlet and an accident discharge pipe are arranged on the first communicating pipe, two groups of second control valves are respectively arranged on the first communicating pipe and the accident discharge pipe, a second draught fan is arranged on the first communicating pipe in a communicating manner, the deep condensation unit is communicated with the activated carbon fiber adsorption unit through a second communicating pipe, and a buffer tank and a third control valve are arranged on the second communicating pipe, the output end of the activated carbon fiber adsorption unit is provided with an exhaust pipe, and the accident exhaust pipe is communicated with the exhaust pipe.
Specifically, the low-temperature diesel oil cleaning unit comprises two groups of washing towers, wherein a plurality of groups of packing layers and two groups of mist catching nets are respectively arranged in the two groups of washing towers, two groups of storage tanks are respectively communicated with the bottoms of the two groups of washing towers, cooling pipelines are respectively arranged in the two groups of storage tanks, the two groups of storage tanks are respectively communicated with each other through two groups of oil delivery pipes, the input ends of the two groups of oil delivery pipes are respectively positioned in the two groups of storage tanks, two groups of filter screens are respectively arranged at the input ends of the two groups of oil delivery pipes, two groups of oil delivery pumps are respectively arranged on the two groups of oil delivery pipes, multi-component flow pipes are respectively communicated with the two groups of oil delivery pipes, the multi-component flow pipes are partially fixed in the two groups of washing towers, a plurality of spray heads are respectively arranged on a plurality of flow distribution pipes, a plurality of opening valves are respectively arranged on the plurality of flow distribution pipes, and the output ends of the two groups of washing towers are both communicated with a first output pipe, and the two groups of washing towers are communicated through a circulation pipeline.
The deep condensation unit comprises a primary condensation system, a secondary condensation system and a tertiary condensation system, wherein the primary condensation system, the secondary condensation system and the tertiary condensation system are sequentially connected, a heat exchange system is arranged between the secondary condensation system and the tertiary condensation system, a temperature return system is arranged at the output end of the tertiary condensation system, the output ends of the primary condensation system, the secondary condensation system, the tertiary condensation system, the heat exchange system and the temperature return system are communicated through pipelines and are communicated with a condensate recycling substance pipeline outlet, and a temporary storage tank and a transmission pump are arranged on the condensate recycling pipeline.
Specifically, the activated carbon fiber adsorption unit includes three active carbon adsorption tanks of group, all be provided with activated carbon fiber filler in three active carbon adsorption tanks of group, the second is through three input tubes of group and the first input intercommunication of three active carbon adsorption tanks of group, the blast pipe is through three output tubes of group and the first output intercommunication of three active carbon adsorption tanks of group, three active carbon adsorption tanks of group second output and second input of group are through the backflow pipeline intercommunication.
The device comprises an activated carbon fiber adsorption unit, a regeneration recovery system, a cooling system, a steam input pipeline, a steam condensate output pipeline, a condenser, a desorption fan and a light component external air supply fan, wherein the regeneration recovery system is arranged on the activated carbon fiber adsorption unit and comprises the cooling system, the steam input pipeline, the steam condensate output pipeline, the condenser, the desorption fan and the light component external air supply fan, the steam input pipeline is communicated with three groups of activated carbon adsorption tanks, the steam condensate output pipeline is communicated with the steam input pipeline, third output ends of the three groups of activated carbon adsorption tanks are respectively provided with an air outlet pipeline and communicated with the condenser, a first output end of the condenser is provided with a discharge pipeline communicated with the light component external air supply fan, the discharge pipeline is provided with a return pipeline communicated with the steam input pipeline, the desorption fan is arranged on the return pipeline, a second output end of the condenser is provided with a layering groove, and a recovery storage tank and a decontamination water biochemical treatment system are communicated with an output end of the layering groove, the output end of the recovery storage tank is communicated with a condensate recovery pipeline, and the cooling system is communicated with the condenser.
Specifically, regeneration recovery system still includes vapour and liquid separator, dry surface cooler, drying fan and heat exchanger, three active carbon adsorption tanks fourth output intercommunications of group are provided with the circulating line and communicate with vapour and liquid separator, vapour and liquid separator output and dry surface cooler intercommunication, dry surface cooler and heat exchanger intercommunication to be provided with drying fan between dry surface cooler and heat exchanger, the heat exchanger output with the pipeline intercommunication of giving vent to anger, steam input pipeline and heat exchanger intercommunication, dry surface cooler and cooling system intercommunication to dry surface cooler and vapour and liquid separator output all communicate with the layering groove.
Based on the oil gas treatment system, an oil gas treatment process is provided, and the process comprises the following steps:
s1, low-temperature diesel oil cleaning oil gas: oil gas is guided into two groups of washing towers in a low-temperature diesel oil cleaning unit through a first tail gas inlet, diesel oil in two groups of storage tanks is cooled through two groups of cooling pipelines, the cooled diesel oil is lifted through two groups of oil delivery pipes under the action of two groups of oil delivery pumps, and enters the two groups of washing towers after being shunted through a multi-component flow pipe and is sprayed out through a plurality of groups of spray heads, the diesel oil is in countercurrent contact with the oil gas, organic matters in the oil gas are absorbed through the diesel oil, saturated diesel oil is absorbed, and the diesel oil can be sent into a sump oil system for re-refining;
s2, deep condensation treatment: oil gas cleaned by low-temperature diesel oil or light oil with simpler components is introduced into a primary condensing system through a second induced draft fan and flows along the primary condensing system, the secondary condensing system, a heat exchange system, a tertiary condensing system and a temperature return system to remove a large amount of water vapor and organic matter components in the oil gas, the tertiary condensing exhaust can participate in the heat exchange of the secondary condensing exhaust through the heat exchange system, the temperature of the oil gas discharged through the secondary condensing system is effectively reduced, the temperature return system is used for carrying out temperature return treatment on tail gas discharged from the tertiary condensing system to improve the temperature of the tail gas, and liquid generated by condensation is discharged through a condensation recovery pipeline;
s3, activated carbon fiber adsorption treatment: the tail gas after deep condensation treatment enters three groups of activated carbon adsorption tanks through a second communicating pipe, a small amount of pollutants in the tail gas are adsorbed by activated carbon fibers, and the adsorbed gas reaches the standard and is discharged through an exhaust pipe;
s4, activated carbon fiber regeneration treatment: when the activated carbon fibers are saturated in adsorption, low-pressure steam is introduced to regenerate the activated carbon fibers, organic matters adsorbed on the activated carbon fibers are desorbed and are taken out along with the steam to enter a condenser, the activated carbon fibers are liquefied in the condenser to form negative pressure, desorption of other organic matters is completed, drying is carried out on the activated carbon fibers through a drying fan, gas discharged from three groups of activated carbon adsorption tanks is subjected to gas-liquid separation through a gas-liquid separator, then enters a surface cooling dryer to be cooled, part of steam is removed, the gas is subjected to heat exchange through the drying fan and a heat exchanger and then flows back through a third output end of the activated carbon adsorption tank to form circulation, and the gas recovered through the condenser, the gas-liquid separator and the drying surface cooler is discharged through a condensate recovery pipeline.
Specifically, cold sources in two groups of cooling pipelines in the low-temperature diesel cleaning unit are derived from cold energy provided by a compressor of the deep condensation unit; the temperature of the diesel oil is 7-15 ℃; the empty tower flow velocity of the washing tower is set to be 0.3-0.8 m/s; the liquid-gas ratio of the low-temperature diesel oil to the oil gas is more than or equal to 5.5L/m3(ii) a The contact time of the low-temperature diesel oil and the oil gas is more than or equal to 6 s.
Specifically, the condensation temperature of the primary condensation system is 0-2 ℃, the condensation temperature of the secondary condensation system is-35 ℃, the condensation temperature of the tertiary condensation system is-110 to-130 ℃, and the temperature return temperature of the temperature return system is 0-2 ℃.
(III) advantageous effects
Compared with the prior art, the utility model provides an oil-gas treatment system, which has the following beneficial effects:
according to the oil gas treatment system, heavy oil such as crude oil gas, asphalt tail gas, wax oil tail gas and the like can be sequentially and continuously treated through the low-temperature diesel oil cleaning unit, the deep condensation unit and the activated carbon fiber adsorption unit, light oil such as gasoline oil, aviation kerosene, naphtha and aluminum foil oil can be treated only through the deep condensation unit and the activated carbon fiber adsorption unit, the treated gas can meet the requirements of local emission standards (DB37/2801.6-2018, part 6 of emission standards of volatile organic compounds: organic chemical industry), the three units are connected in series, all components in oil gas can be completely treated, and near zero emission is realized;
the oil gas treatment system is provided with a low-temperature diesel oil cleaning unit, most hydrocarbon substances and benzene molecules in the tail gas of crude oil, light oil and wax oil asphalt are nonpolar or weak polarity, diesel oil is used as a nonpolar organic solvent, and the diesel oil can easily absorb organic substances in the tail gas of the oil and the asphalt according to the principle of 'similar intermiscibility', namely the mutual solubility of the organic substances; under the condition of low temperature, steam and heat in oil gas are absorbed by diesel oil, so that part of high-boiling-point organic matters in the oil gas are directly condensed into liquid, and the liquid is absorbed by the diesel oil, so that the absorption effect is more obvious, and the saturated diesel oil can be sent into a dirty oil system for refining again, and the problem of secondary pollution is avoided;
the application discloses oil gas processing system has designed the condensation unit of degree of depth, divide into tertiary different temperature's condensing equipment and heat transfer economizer, can carry out the condensation of degree of depth with oil gas, and the minimum condensable is to 110-130 ℃ to get rid of most oil gas, reduce pollutant discharge, more energy-concerving and environment-protective, wherein:
the primary condensation temperature is 0-2 ℃ (the temperature is adjustable), most of water vapor is mainly removed by primary condensation, and the reduction or damage of the treatment efficiency of equipment caused by ice formation in the subsequent condensation process is avoided;
the oil gas after the first-stage condensation dehydration enters a second-stage condensation, and the temperature of the second-stage condensation is-35 ℃;
the temperature of the oil gas is reduced to-110 to-130 ℃ by three-stage condensation, most of components in the oil gas are changed from gas state to liquid state at the moment, and the components are separated from the oil gas;
an intermediate heat exchanger is arranged between the third-stage condensation and the second-stage condensation, and the exhaust gas of the third-stage condensation participates in the heat exchange of the exhaust gas of the second-stage condensation, so that the temperature of the oil gas after the second-stage condensation is reduced, the energy consumption of a third-stage refrigeration compressor unit is reduced, and the energy is saved;
meanwhile, the tail gas of the third-stage condensation is reheated, so that the temperature of the oil gas after condensation treatment is increased, and the freezing and cracking conditions of the pipeline are reduced;
because the deep condensation unit is a pure physical process, the liquid condensed in each device is a qualified oil product and can be directly sent into a finished product tank;
according to the oil gas treatment system, the activated carbon fiber adsorption unit is designed, oil gas enters the activated carbon fiber adsorption unit after being washed by low-temperature diesel oil and condensed deeply, a small amount of residual pollutants are adsorbed, the adsorbed gas is discharged after reaching the standard, and the activated carbon fiber is regenerated by steam after being adsorbed and saturated;
when the activated carbon fiber adsorption unit is regenerated, the storage tank is recovered, a light component external air blower is designed, a very small amount of light components such as C2, C3 and the like are started according to the front end pressure during regeneration, the light component external air blower is used as a raw material to be delivered, and steam regeneration liquid containing oil heavy components is hermetically sent to a sewage treatment system to be subjected to biochemical treatment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the structure of a low temperature diesel wash unit;
FIG. 3 is a schematic diagram of the construction of a deep condensing unit;
FIG. 4 is a schematic view of the structure of an activated carbon fiber adsorption unit and a regeneration recovery system;
in the drawings, the reference numbers: 1. a low temperature diesel cleaning unit; 2. a deep condensation unit; 3. an activated carbon fiber adsorption unit; 4. a first tail gas inlet; 5. a flame arrestor; 6. a first control valve; 7. A first output pipe; 8. a first induced draft fan; 9. a first communication pipe; 10. a second tail gas inlet; 11. an accident discharge pipe; 12. a second control valve; 13. a second induced draft fan; 14. a buffer tank; 15. a third control valve; 16. an exhaust pipe; 17. a regeneration recovery system; 18. a second communicating pipe;
a low-temperature diesel cleaning unit: 101. a washing tower; 102. a filler layer; 103. a mist catching net; 104. A storage tank; 105. a cooling pipeline; 106. an oil delivery pipe; 107. a filter screen; 108. an oil supply pump; 109. a shunt tube; 110. a spray head; 111. opening the valve; 112. a flow line;
a deep condensation unit: 201. a primary condensing system; 202. a secondary condensing system; 203. a tertiary condensing system; 204. a heat exchange system; 205. a temperature return system; 206. a condensate recycle line; 207. a temporary storage tank 208 and a transfer pump;
activated carbon fiber adsorption unit: 301. an activated carbon adsorption tank; 302. an activated carbon fiber filler; 303. an input tube; 304. an output pipe; 305. a return pipe;
a regeneration and recovery system: 1701. a cooling system; 1702. a steam input pipe; 1703. a vapor condensate outlet line; 1704. a condenser; 1705. a desorption fan; 1706. a light component external air blower; 1707. an air outlet pipe; 1708. a discharge conduit; 1709. a return conduit; 1710. a layering tank; 1711. a recovery storage tank; 1712. removing the sewage from the biochemical treatment system; 1713. a gas-liquid separator; 1714. drying the surface cooler; 1715. a drying fan; 1716. a heat exchanger; 1717. a circulation line.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, an oil gas treatment system comprises a low-temperature diesel oil cleaning unit 1, a deep condensation unit 2 and an activated carbon fiber adsorption unit 3, wherein an input end of the low-temperature diesel oil cleaning unit 1 is provided with a first tail gas inlet 4, an input end of the low-temperature diesel oil cleaning unit 1 is provided with a flame arrester 5 and a first control valve 6, an output end of the low-temperature diesel oil cleaning unit 1 is provided with a first output pipe 7, the first output pipe 7 is provided with a first induced draft fan 8, an output end of the first output pipe 7 is communicated with the deep condensation unit 2 through a first communication pipe 9, the first communication pipe 9 is provided with a second tail gas inlet 10 and an accident discharge pipe 11, the first communication pipe 9 and the accident discharge pipe 11 are respectively provided with two groups of second control valves 12, the first communication pipe 9 is provided with a second induced draft fan 13, the deep condensation unit 2 is communicated with the activated carbon fiber adsorption unit 3 through a second communication pipe 18, and a buffer tank 14 and a third control valve 15 are arranged on the second communicating pipe 18, an exhaust pipe 16 is arranged at the output end of the activated carbon fiber adsorption unit 3, and the accident discharge pipe 11 is communicated with the exhaust pipe 16.
The low-temperature diesel oil cleaning unit 1 comprises two groups of washing towers 101, wherein a plurality of groups of packing layers 102 and two groups of mist catching nets 103 are respectively arranged in the two groups of washing towers 101, two groups of storage tanks 104 are respectively communicated and arranged at the bottoms of the two groups of washing towers 101, cooling pipelines 105 are respectively arranged in the two groups of storage tanks 104, the two groups of storage tanks 104 are respectively communicated and arranged through two groups of oil feeding pipes 106, the input ends of the two groups of oil feeding pipes 106 are respectively positioned in the two groups of storage tanks 104, two groups of filter screens 107 are respectively arranged at the input ends of the two groups of oil feeding pipes 106, two groups of oil feeding pumps 108 are respectively arranged on the two groups of oil feeding pipes 106, a multi-component flow pipe 109 is respectively communicated and arranged on the two groups of oil feeding pipes 106, the multi-component flow pipe 109 is partially fixed in the two groups of washing towers 101, a plurality of spray nozzles 110 are respectively arranged on the multi-component flow pipe 109, a plurality of opening valves 111 are respectively arranged on the multi-component flow pipes 109, and the output ends of the two groups of washing towers 101 are both communicated and communicated with a first output pipe 7, and the two groups of washing towers 101 are communicated with each other through a circulation pipeline.
The deep condensation unit 2 comprises a first-stage condensation system 201, a second-stage condensation system 202 and a third-stage condensation system 203, the first-stage condensation system 201, the second-stage condensation system 202 and the third-stage condensation system 203 are sequentially connected, a heat exchange system 204 is arranged between the second-stage condensation system 202 and the third-stage condensation system 203, a temperature return system 205 is arranged at the output end of the third-stage condensation system 203, the first-stage condensation system 201, the second-stage condensation system 202, the third-stage condensation system 203, the output ends of the heat exchange system 204 and the temperature return system 205 are communicated through a pipeline, and are communicated with an outlet of a condensate recycling substance pipeline 206, and a temporary storage tank 207 and a transmission pump 208 are arranged on the condensate recycling substance pipeline 206.
The activated carbon fiber adsorption unit 3 includes three groups of activated carbon adsorption tanks 301, activated carbon fiber filler 302 is provided in the three groups of activated carbon adsorption tanks 301, the second communicating pipe 18 is communicated with the first input end of the three groups of activated carbon adsorption tanks 301 through three groups of input pipes 303, the exhaust pipe 16 is communicated with the first output end of the three groups of activated carbon adsorption tanks 301 through three groups of output pipes 304, and the second output end of the three groups of activated carbon adsorption tanks 301 is communicated with the second input end through a return pipe 305.
The device also comprises a regeneration recovery system 17, wherein the regeneration recovery system 17 is arranged on the activated carbon fiber adsorption unit 3, the regeneration recovery system 17 comprises a cooling system 1701, a steam input pipeline 1702, a steam condensate output pipeline 1703, a condenser 1704, a desorption fan 1705 and a light component external air supply fan 1706, the steam input pipeline 1702 is communicated with the three groups of activated carbon adsorption tanks 301, the steam condensate output pipeline 1703 is communicated with the steam input pipeline 1702, the third output ends of the three groups of activated carbon adsorption tanks 301 are respectively provided with an air outlet pipeline 1707 and communicated with the condenser 1704, the first output end of the condenser 1704 is provided with a discharge pipeline 1708 communicated with the light component external air supply fan 1706, the discharge pipeline 1708 is provided with a return pipeline 1709 communicated with the steam input pipeline 1702, the desorption fan 1705 is arranged on the return pipeline 1709, the second output end of the condenser 1704 is provided with a layering groove 1710, and the output end of the layering groove 1710 is communicated with a recovery water storage tank 1711 and a decontamination water biochemical treatment system 1712, the output end of the recovery storage tank 1711 is communicated with the condensate recovered substance pipeline 206, the cooling system 1701 is communicated with the condenser 1704, the regeneration and recovery system 17 further comprises a gas-liquid separator 1713, a drying surface cooler 1714, a drying fan 1715 and a heat exchanger 1716, the fourth output ends of the three groups of activated carbon adsorption tanks 301 are communicated with a circulation pipeline 1717 and communicated with the gas-liquid separator 1713, the output end of the gas-liquid separator 1713 is communicated with the drying surface cooler 1714, the drying surface cooler 1714 is communicated with the heat exchanger 1716, the drying fan 1715 is arranged between the drying surface cooler 1714 and the heat exchanger 1716, the output end of the heat exchanger 1716 is communicated with an air outlet pipeline 1707, a steam input pipeline 1702 is communicated with the heat exchanger 1716, the drying surface cooler 1714 is communicated with the cooling system 1701, and the output ends of the drying surface cooler 1714 and the air 1713 are communicated with the layering tank 1710.
Based on the oil gas treatment system, an oil gas treatment process is provided, and the process comprises the following steps:
s1, low-temperature diesel oil cleaning oil gas: oil gas is guided into two groups of washing towers in a low-temperature diesel oil cleaning unit through a first tail gas inlet, diesel oil in two groups of storage tanks is cooled through two groups of cooling pipelines, the cooled diesel oil is lifted through two groups of oil delivery pipes under the action of two groups of oil delivery pumps, and enters the two groups of washing towers after being shunted through a multi-component flow pipe and is sprayed out through a plurality of groups of spray heads, the diesel oil is in countercurrent contact with the oil gas, organic matters in the oil gas are absorbed through the diesel oil, saturated diesel oil is absorbed, and the diesel oil can be sent into a sump oil system for re-refining;
s2, deep condensation treatment: introducing oil gas cleaned by low-temperature diesel oil or light oil with simpler components into a primary condensation system through a second induced draft fan, flowing along the primary condensation system, a secondary condensation system, a heat exchange system, a tertiary condensation system and a temperature return system to remove a large amount of water vapor and organic matter components in the oil gas, enabling tertiary condensation exhaust gas to participate in heat exchange of secondary condensation exhaust gas through the heat exchange system, effectively reducing the temperature of the oil gas discharged through the secondary condensation system, carrying out temperature return treatment on tail gas discharged from the tertiary condensation system through the temperature return system to improve the temperature of the tail gas, discharging liquid generated by condensation through a condensation recovery pipeline, wherein the condensation temperature of the primary condensation system is 0-2 ℃, the condensation temperature of the secondary condensation system is-35 ℃, the condensation temperature of the tertiary condensation system is-110 to-130 ℃, the temperature return temperature of the temperature return system is 0-2 ℃;
s3, activated carbon fiber adsorption treatment: the tail gas after deep condensation treatment enters three groups of activated carbon adsorption tanks through a second communicating pipe, a small amount of pollutants in the tail gas are adsorbed by activated carbon fibers, and the adsorbed gas reaches the standard and is discharged through an exhaust pipe;
s4, activated carbon fiber regeneration treatment: when the activated carbon fiber is saturated in adsorption, low-pressure steam is introduced to regenerate the activated carbon fiber, organic matters adsorbed on the activated carbon fiber are desorbed and are taken out along with the steam to enter a condenser, the steam is liquefied in the condenser to form negative pressure to finish desorption of other organic matters, the activated carbon fiber is dried by a drying fan, gas discharged from three groups of activated carbon adsorption tanks is subjected to gas-liquid separation by a gas-liquid separator, then the gas enters a surface cooling dryer to be cooled, part of steam is removed, the gas is subjected to heat exchange by the drying fan and a heat exchanger and then flows back by a third output end of the activated carbon adsorption tank to form circulation, and the gas recovered by the condenser, the gas-liquid separator and the drying surface cooler is discharged by a condensate recovery pipeline,
according to the oil gas treatment system, heavy oil such as crude oil gas, asphalt tail gas, wax oil tail gas and the like can be sequentially and continuously treated through the low-temperature diesel oil cleaning unit, the deep condensation unit and the activated carbon fiber adsorption unit, light oil such as gasoline oil, aviation kerosene, naphtha and aluminum foil oil can be treated only through the deep condensation unit and the activated carbon fiber adsorption unit, the treated gas can meet the requirements of local emission standards (DB37/2801.6-2018, part 6 of emission standards of volatile organic compounds: organic chemical industry), the three units are connected in series, all components in oil gas can be completely treated, and near zero emission is realized;
the oil gas treatment system is provided with a low-temperature diesel oil cleaning unit, most hydrocarbon substances and benzene molecules in the tail gas of crude oil, light oil and wax oil asphalt are nonpolar or weak polarity, diesel oil is used as a nonpolar organic solvent, and the diesel oil can easily absorb organic substances in the tail gas of the oil and the asphalt according to the principle of 'similar intermiscibility', namely the mutual solubility of the organic substances; under the condition of low temperature, steam and heat in oil gas are absorbed by diesel oil, so that part of high-boiling-point organic matters in the oil gas are directly condensed into liquid, and the liquid is absorbed by the diesel oil, so that the absorption effect is more obvious, and the saturated diesel oil can be sent into a dirty oil system for refining again, and the problem of secondary pollution is avoided;
the application discloses oil gas processing system has designed the condensation unit of degree of depth, divide into tertiary different temperature's condensing equipment and heat transfer economizer, can carry out the condensation of degree of depth with oil gas, and the minimum condensable is to 110-130 ℃ to get rid of most oil gas, reduce pollutant discharge, more energy-concerving and environment-protective, wherein:
the primary condensation temperature is 0-2 ℃ (the temperature is adjustable), most of water vapor is mainly removed by primary condensation, and the reduction or damage of the treatment efficiency of equipment caused by ice formation in the subsequent condensation process is avoided;
the oil gas after the first-stage condensation dehydration enters a second-stage condensation, and the temperature of the second-stage condensation is-35 ℃;
the temperature of the oil gas is reduced to-110 to-130 ℃ by three-stage condensation, most of components in the oil gas are changed from gas state to liquid state at the moment, and the components are separated from the oil gas;
an intermediate heat exchanger is arranged between the third-stage condensation and the second-stage condensation, and the exhaust gas of the third-stage condensation participates in the heat exchange of the exhaust gas of the second-stage condensation, so that the temperature of the oil gas after the second-stage condensation is reduced, the energy consumption of a third-stage refrigeration compressor unit is reduced, and the energy is saved;
meanwhile, the tail gas of the third-stage condensation is reheated, so that the temperature of the oil gas after condensation treatment is increased, and the freezing and cracking conditions of the pipeline are reduced;
because the deep condensation unit is a pure physical process, the liquid condensed in each device is a qualified oil product and can be directly sent into a finished product tank;
according to the oil gas treatment system, the activated carbon fiber adsorption unit is designed, oil gas enters the activated carbon fiber adsorption unit after being washed by low-temperature diesel oil and condensed deeply, a small amount of residual pollutants are adsorbed, the adsorbed gas is discharged after reaching the standard, and the activated carbon fiber is regenerated by steam after being adsorbed and saturated;
when the activated carbon fiber adsorption unit is regenerated, the storage tank is recovered, a light component external air blower is designed, a very small amount of light components such as C2, C3 and the like are started according to the front end pressure during regeneration, the light component external air blower is used as a raw material to be delivered, and steam regeneration liquid containing oil heavy components is hermetically sent to a sewage treatment system to be subjected to biochemical treatment.
After condensation, the oil gas enters an activated carbon fiber adsorption unit, organic pollutants remained in the oil gas are adsorbed into micropores of the activated carbon fiber under the action of Van der Waals force, the adsorption unit adopts a multistage adsorption process, is alternately used and regenerated, and is automatically switched through program control, so that the continuous operation and continuous processing capacity of the whole set of adsorption system are ensured, the processing capacity of equipment is not influenced when the equipment is regenerated, finally, the oil gas at an outlet reaches the standard and is discharged, when the activated carbon fiber adsorption device reaches a set regeneration time, low-pressure steam is introduced to regenerate the activated carbon fiber, organic matters adsorbed on the activated carbon fiber are desorbed, meanwhile, mixed steam containing water vapor and organic vapor is blown out by means of steam sweeping, the mixed steam is sent to a recovery system, then, a desorption fan is started, the water vapor in the tank is blown into a condenser, the water vapor is liquefied, and negative pressure is formed in the activated carbon fiber adsorption tank, and finally, starting a drying fan to dry the activated carbon fiber adsorption device, heating the gas discharged by the drying fan through a heater, introducing the heated gas into equipment, exhausting the gas from the equipment, introducing the gas into a gas-liquid separator for gas-liquid separation, introducing the residual gas into a drying surface cooler to cool the gas, removing residual partial steam in the gas while cooling, and then returning to the drying fan for recycling. After drying, completely removing moisture contained in the activated carbon fibers, after the whole regeneration process is finished, putting the equipment into use again, allowing mixed condensate of mixed gas containing water vapor and organic steam generated during regeneration of the activated carbon fibers after condensation of the mixed gas through a condensation heat exchanger and condensate flowing out from the bottom of an adsorber to flow into a specially designed separation device, performing oil-water separation, and discharging layered wastewater into a sewage pipeline; the gasoline condensate enters the metering tank through self-flowing and is completely recycled with the gasoline condensate collected by the condensing unit.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The electrical components in the paper are all electrically connected with an external master controller and 380V industrial electricity, and the master controller can be a computer and other conventional known devices for controlling.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An oil gas treatment system is characterized by comprising a low-temperature diesel oil cleaning unit (1), a deep condensation unit (2) and an activated carbon fiber adsorption unit (3), wherein the input end of the low-temperature diesel oil cleaning unit (1) is provided with a first tail gas inlet (4), the input end of the low-temperature diesel oil cleaning unit (1) is provided with a flame arrester (5) and a first control valve (6), the output end of the low-temperature diesel oil cleaning unit (1) is provided with a first output pipe (7), the first output pipe (7) is provided with a first induced draft fan (8), the output end of the first output pipe (7) is communicated with the deep condensation unit (2) through a first communicating pipe (9), the first communicating pipe (9) is provided with a second tail gas inlet (10) and an accident discharge pipe (11), the first communicating pipe (9) and the accident discharge pipe (11) are respectively provided with two groups of second control valves (12), the first communicating pipe (9) is provided with a second induced draft fan (13) in a communicating mode, the deep condensation unit (2) is communicated with the activated carbon fiber adsorption unit (3) through a second communicating pipe (18) and is provided with a buffer tank (14) and a third control valve (15) on the second communicating pipe (18), the output end of the activated carbon fiber adsorption unit (3) is provided with an exhaust pipe (16), and the accident discharge pipe (11) is communicated with the exhaust pipe (16).
2. The oil and gas treatment system according to claim 1, wherein the low temperature diesel oil cleaning unit (1) comprises two sets of scrubbing towers (101), wherein a plurality of sets of packing layers (102) and a plurality of sets of mist catching nets (103) are respectively arranged in the two sets of scrubbing towers (101), two sets of storage tanks (104) are respectively arranged at the bottoms of the two sets of scrubbing towers (101) in a communication manner, cooling pipelines (105) are respectively arranged in the two sets of storage tanks (104), the two sets of storage tanks (104) are respectively communicated through two sets of oil delivery pipes (106), the input ends of the two sets of oil delivery pipes (106) are respectively arranged in the two sets of storage tanks (104), two sets of filter screens (107) are respectively arranged at the input ends of the two sets of oil delivery pipes (106), two sets of oil delivery pipes (108) are respectively arranged on the two sets of oil delivery pipes (106), and a plurality of shunt pipes (109) are respectively communicated and arranged on the two sets of oil delivery pipes (106), the multi-group shunt tubes (109) are partially fixed in the two groups of washing towers (101), the multi-group spray heads (110) are respectively arranged on the multi-group shunt tubes (109), the multi-group open valves (111) are respectively arranged on the multi-group shunt tubes (109), the output ends of the two groups of washing towers (101) are communicated with the first output tube (7), and the two groups of washing towers (101) are communicated with each other through a circulation pipeline.
3. Oil and gas treatment system according to claim 1, characterized in that the deep condensation unit (2) comprises a primary condensation system (201), a secondary condensation system (202) and a tertiary condensation system (203), the first-stage condensation system (201), the second-stage condensation system (202) and the third-stage condensation system (203) are connected in sequence, a heat exchange system (204) is arranged between the secondary condensation system (202) and the tertiary condensation system (203), a temperature return system (205) is arranged at the output end of the three-stage condensation system (203), the output ends of the first-stage condensation system (201), the second-stage condensation system (202), the third-stage condensation system (203), the heat exchange system (204) and the temperature return system (205) are communicated through pipelines, and is communicated with the outlet of the condensed and recovered material pipeline (206), and a temporary storage tank (207) and a transfer pump (208) are arranged on the condensed and recovered material pipeline (206).
4. The oil and gas treatment system according to claim 1, wherein the activated carbon fiber adsorption unit (3) comprises three groups of activated carbon adsorption tanks (301), activated carbon fiber fillers (302) are arranged in the three groups of activated carbon adsorption tanks (301), the second communication pipe (18) is communicated with first input ends of the three groups of activated carbon adsorption tanks (301) through three groups of input pipes (303), the exhaust pipe (16) is communicated with first output ends of the three groups of activated carbon adsorption tanks (301) through three groups of output pipes (304), and second output ends and second input ends of the three groups of activated carbon adsorption tanks (301) are communicated with each other through a return pipe (305).
5. The oil and gas treatment system according to claim 1, further comprising a regeneration recovery system (17), wherein the regeneration recovery system (17) is arranged on the activated carbon fiber adsorption unit (3), and the regeneration recovery system (17) comprises a cooling system (1701), a steam input pipeline (1702), a steam condensate output pipeline (1703), a condenser (1704), a desorption fan (1705) and a light component external blower (1706), wherein the steam input pipeline (1702) is communicated with three groups of activated carbon adsorption tanks (301), the steam condensate output pipeline (1703) is communicated with the steam input pipeline (1702), third output ends of the three groups of activated carbon adsorption tanks (301) are respectively provided with an air outlet pipeline (1707) and are communicated with the condenser (1704), a first output end of the condenser (1704) is provided with a discharge pipeline (1708) and is communicated with the light component external blower (1706), be provided with return line (1709) and steam input pipeline (1702) intercommunication on discharge pipe (1708), desorption fan (1705) set up on return line (1709), condenser (1704) second output is provided with layering groove (1710) to be provided with recovery storage tank (1711) and decontamination water biochemical treatment system (1712) at layering groove (1710) output intercommunication, recovery storage tank (1711) output and condensate recovery thing pipeline (206) intercommunication, cooling system (1701) and condenser (1704) intercommunication.
6. The oil and gas treatment system according to claim 5, wherein the regenerative recovery system (17) further comprises a gas-liquid separator (1713), a dry surface cooler (1714), a drying fan (1715) and a heat exchanger (1716), wherein the fourth output end of the three groups of activated carbon adsorption tanks (301) is communicated with a circulation pipeline (1717) and is communicated with the gas-liquid separator (1713), the output end of the gas-liquid separator (1713) is communicated with the dry surface cooler (1714), the dry surface cooler (1714) is communicated with the heat exchanger (1716), the drying fan (1715) is arranged between the dry surface cooler (1714) and the heat exchanger (1716), the output end of the heat exchanger (1716) is communicated with an air outlet pipeline (1707), the steam input pipeline (1702) is communicated with the heat exchanger (1716), the dry surface cooler (1714) is communicated with the cooling system (1701), and the output ends of the dry surface cooler (1714) and the gas-liquid separator (1713) are communicated with the stratification tank (1710).
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| CN202121306563.5U CN215962860U (en) | 2021-06-11 | 2021-06-11 | Oil gas treatment system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114870558A (en) * | 2022-04-27 | 2022-08-09 | 河北金谷再生资源开发有限公司 | Processing apparatus of waste gas that produces in biodiesel production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114870558A (en) * | 2022-04-27 | 2022-08-09 | 河北金谷再生资源开发有限公司 | Processing apparatus of waste gas that produces in biodiesel production process |
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