CN219976147U - VOCs tail gas supercharging conveying system of constant pressure tank of intrinsically safe aromatic extraction device - Google Patents
VOCs tail gas supercharging conveying system of constant pressure tank of intrinsically safe aromatic extraction device Download PDFInfo
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- CN219976147U CN219976147U CN202321133027.9U CN202321133027U CN219976147U CN 219976147 U CN219976147 U CN 219976147U CN 202321133027 U CN202321133027 U CN 202321133027U CN 219976147 U CN219976147 U CN 219976147U
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 48
- 238000000605 extraction Methods 0.000 title claims abstract description 27
- 125000003118 aryl group Chemical group 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 182
- 239000007788 liquid Substances 0.000 claims abstract description 48
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- 238000001179 sorption measurement Methods 0.000 claims abstract description 22
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 25
- 239000012071 phase Substances 0.000 claims description 22
- 239000007791 liquid phase Substances 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 5
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- 230000001276 controlling effect Effects 0.000 abstract 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 27
- 229930195733 hydrocarbon Natural products 0.000 description 12
- 150000002430 hydrocarbons Chemical class 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
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- 238000007599 discharging Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
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- 231100001234 toxic pollutant Toxicity 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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Abstract
The utility model discloses an intrinsically safe aromatic extraction device normal pressure tank VOCs tail gas pressurizing and conveying system which mainly comprises a normal pressure tank, a single-breathing valve, VOCs gas phase branch lines, a flame arrester, a tail gas collecting pipe, a tail gas liquid separating tank, a pressurizing fan, a tail gas conveying main pipe, an online oxygen analyzer, a pressure transmitter, a liquid level transmitter, a switching valve, a regulating valve, a cooler, a flow transmitter, an adsorption tank, a temperature transmitter, an alarm device, a frequency converter, a control system and the like. According to the utility model, the exhaust gas of the normal pressure tank VOCs of the aromatic hydrocarbon extraction device is subjected to oil gas collection and pressurization conveying, the DCS control system is used for controlling the pressurization conveying of the exhaust gas, and the exhaust gas of the normal pressure tank VOCs is conveyed to the exhaust gas treatment facility, so that the exhaust of the device VOCs can be safely and effectively solved, the national and local standard emission and environmental quality requirements are met, and meanwhile, excessive investment and increase of the exhaust gas treatment cost are avoided.
Description
Technical Field
The utility model relates to the technical field of petrochemical device tail gas treatment, in particular to a tail gas pressurizing and conveying system for VOCs tail gas of an atmospheric tank of an intrinsically safe aromatic extraction device.
Background
The aromatic hydrocarbon extraction device is a device for producing BTX (benzene, toluene and xylene) in petrochemical industry, provides important primary basic organic raw materials for downstream devices, and is an important process device for reducing and increasing oil. The normal pressure tank of the aromatic hydrocarbon extraction device is responsible for storing fresh solvent of the device, the feeding of the rectifying tower is stable, temporary storage, transfer and storage of shutdown solvent of off-grade oil in operation. The normal volume of the normal pressure tanks is 200-1000 m 3 The gas phase exhaust is mainly nitrogen and hydrocarbons, is mainly the VOCs (volatile organic compounds) emission source of petrochemical enterprises, particularly aromatic hydrocarbon exhaust containing benzene and the like, is harmful to human health, most hydrocarbon mediums are limited by the relevant limit values of national standards of malodorous pollutant emission standard (GB 14554-1993) and petroleum refining industrial pollutant emission standard (GB 31570-2015), and meanwhile, the environmental protection department issues comprehensive treatment scheme of volatile organic compounds of petrochemical industry (including oil and gas recovery and other treatment facilities on the basis of an internal floating roof tank).
At present, the existing treatment of the tail gas of the normal pressure tank of the aromatic hydrocarbon extraction device mainly adopts the measures of high-efficiency sealing of a full liquid-receiving floating disc, the tail gas compression and then the low-pressure flame system, the burning of the negative-pressure flame of a heating furnace of an adjacent device, the burning after the absorption by diesel oil and the like, and the combined measures. Because benzene and C6 hydrocarbon saturated steam are low and high, VOCs emission cannot be completely eliminated by adopting a high-efficiency sealed full-liquid-receiving floating disc; because the tail gas contains aromatic components and is sent to a low-pressure torch system, the stable operation of a flare gas compression sealing system is not facilitated due to the solubility of aromatic hydrocarbon to fluororubber and the like, the potential safety hazard of mechanical seal damage is caused, and meanwhile, the oxygen content in the tail gas is a threat to the safety of the flare system; the tail gas contains BTX components, the flow is unstable, so that potential safety hazards such as unstable combustion of the heating furnace, overhigh flame, high furnace tube temperature and the like are caused; most of the existing tail gas pressurizing and conveying facilities do not consider the problem that the tail gas emission meets the standard in environment protection under abnormal working conditions, and the requirements of GB 37822-2019 for the unorganized emission control standard of volatile organic compounds on the unorganized emission organic substances are not met; the device normal pressure tank volume is smaller, and in the normal steady production process, the normal pressure tank only has the gas volume that small breathing was discharged to the tail gas, and the flow is little, undulant big and nitrogen content is high, and the independent one set of oil gas recovery system of arene extraction device has the problem such as investment height, energy consumption height, planar layout restriction.
Therefore, aiming at the tail gas of the normal pressure tank VOCs of the existing refinery and newly-built aromatic extraction device, how to reduce the environmental protection treatment cost of the tail gas, the essential safety, environmental protection and long-period operation are required to be achieved, and the method becomes an important problem to be solved by the professional technology in the field.
Disclosure of Invention
The utility model aims to provide an intrinsically safe type aromatic hydrocarbon extraction device normal pressure tank VOCs tail gas pressurizing and conveying system which has simple flow, environment protection up to standard and utilizes the VOCs tail gas treatment measures of a whole plant, aiming at the defects that the treatment measures of the VOCs tail gas of the normal pressure tank of the aromatic hydrocarbon extraction device in the prior art have great influence on the safe and stable operation of a heating furnace and a torch system, the tail gas emission cannot be effectively solved, the production cost is high and the like.
The technical scheme of the utility model is as follows:
the utility model provides an essential safety formula aromatic extraction device atmospheric pressure jar VOCs tail gas booster delivery system, mainly comprises atmospheric pressure jar, single breathe suction valve, VOCs gas phase branch line, flame arrester, tail gas collecting pipe, tail gas liquid separating jar, booster fan, tail gas delivery house steward, online oxygen analyzer, pressure transmitter, liquid level transmitter, ooff valve, governing valve, cooler, flow transmitter, adsorption tank, temperature transmitter, alarm device, converter, DCS control system etc..
The device normal pressure jar is equipped with nitrogen and seals the system, and the top gaseous phase export is equipped with singly breathe the suction valve, the normal pressure jar be equipped with VOCs gaseous phase branch with VOCs tail gas collecting pipe is linked together, the tail gas collecting pipe with tail gas divides the fluid reservoir to be linked together.
The gas phase outlet at the top of the tail gas liquid separating tank is provided with two paths, one path is communicated with the booster fan, the other path is communicated with the adsorption tank, the bottom liquid phase outlet is communicated with the light dirty oil main pipe of the device through the switch valve, the wall of the tail gas liquid separating tank is provided with a nitrogen purging port, the tail gas liquid separating tank is communicated with a nitrogen purging line through the switch valve, the gas phase of the tail gas liquid separating tank is provided with an online oxygen analyzer and a pressure transmitter, and the liquid phase is provided with a liquid level transmitter.
The outlet pipeline of the booster fan is communicated with the inlet of the cooler, one path of outlet of the cooler is communicated with the gas phase of the tail gas liquid separating tank through the regulating valve, the other path of outlet of the cooler is communicated with the tail gas treatment facility through the tail gas conveying main pipe, the shell liquid phase of the cooler is communicated with the tail gas liquid separating tank, and the outlet at the top of the adsorption tank is communicated with the atmosphere.
The inlet collecting pipe of the booster fan is provided with a pressure transmitter, the tail gas conveying main pipe is provided with a flow transmitter, a temperature transmitter, an online oxygen analyzer and a switch valve, and the frequency converter is connected with the motor of the tail gas booster.
The DCS control system is respectively connected with the switch valve, the regulating valve, the pressure transmitter, the online oxygen analyzer, the temperature transmitter and the frequency converter.
In one embodiment, a single-breathing valve is arranged at the gas phase outlet at the top of the normal pressure tank, a bidirectional explosion-proof bombing flame arrester is arranged at the position, close to the storage tank, of the gas phase branch line, and the opening pressure of the single-breathing valve is 900PaG.
In one embodiment, the tail gas manifold is provided with a bi-directional detonation-resistant, non-steady state flame arrester.
In one embodiment, the online oxygen analyzer is a laser oxygen analyzer, so that the influence of water and gas concentration on measurement is avoided, the measurement accuracy is higher, and the normal operation control oxygen content is less than 2%V.
In one embodiment, when the oxygen content of any one of the online oxygen analyzers is larger than 2%V, the inlet switch valve of the adsorption tank and the nitrogen sweeping line switch valve are opened in an interlocking mode, the booster fan is stopped, the tail gas conveying main pipe switch valve is closed, and intrinsic safety of the tail gas booster conveying system and downstream tail gas treatment facilities is ensured.
In one embodiment, the booster fan is a Roots fan, so that the problem that benzene-containing wastewater is difficult to treat due to the fact that a water ring pump generates benzene-containing wastewater is avoided, the number of the booster fans is 2, and a manual/automatic change-over switch is required to be arranged when the booster fan is started and prepared. The double-end mechanical seal is adopted, the sealing liquid adopts desalted water, the leakage of the rotating part of the fan is avoided, and the outlet pressure of the booster fan is 40KPaG.
In one embodiment, the tail gas booster adopts a variable frequency motor, and the variable frequency range is 0-50 HZ. The frequency converter is controlled by the booster fan inlet collecting pipe pressure transmitter, and when the pressure rises to 1.3KPaG under the premise that the oxygen content in oil gas is normal, the booster fan is regulated to rated frequency; when the pressure is reduced to 0.6KPaG, the fan frequency is adjusted to 40%; and when the pressure is lower than 0.2KPaG, starting the bypass regulating valve to regulate.
In one embodiment, the adsorption tank is provided with active carbon, the adsorption efficiency of the active carbon on hydrocarbons reaches 99.5%, the active carbon is discharged into the atmosphere after being adsorbed, the adsorption tank is provided with a temperature transmitter, and the temperature is 55 ℃ when the alarm temperature is high.
In one embodiment, the cooler is a tube type heat exchanger, the material is S31603, the cooler is provided with a separation function facility, a liquid outlet is arranged, the cooling medium is circulating water, and the circulating water passes through a tube side.
In one embodiment, the tail gas liquid separating tank liquid level transmitter is provided with 1, the switch valve interlocking signal is that the tail gas liquid separating tank liquid level transmitter is opened at a liquid level of more than or equal to 70%, and closed at a liquid level of less than or equal to 25%.
The technical scheme provided by the embodiment of the utility model has the following advantages and beneficial effects:
according to the utility model, the VOCs tail gas pressurizing and conveying system of the normal pressure tank VOCs of the new aromatic extraction device is added, VOCs tail gas exhaled by the single breather valve of the normal pressure tank is pressurized by the pressurizing fan and then sent to the tail gas treatment facility, so that the emission of polluted waste gas is reduced, the emission of toxic pollutants is reduced, the environmental pollution is reduced, the requirements of national environmental protection part on up-to-standard emission are met, and the problems of high investment and high operation cost caused by the independent installation of the single tail gas treatment facility are avoided.
The utility model adopts the Roots blower as the booster blower, avoids generating benzene-containing wastewater which is difficult to treat in the water ring pump, reduces the cost of sewage treatment, adopts double-end mechanical seal, adopts desalted water as sealing liquid, and avoids leakage of the rotating part of the blower. The laser oxygen analyzer is adopted, so that the sampling and pretreatment processes are omitted, and the situation that the benzene-containing tail gas cannot be discharged in a closed mode is avoided.
In order to ensure the intrinsic safety of the tail gas pressurizing and conveying system, the on-line laser oxygen analyzer and the flame arrester are arranged at key positions, so that the intrinsic safety of the normal tail gas conveyed to the tail gas treatment facility system is ensured, when the abnormal oxygen content exceeds the standard, the relevant valves are opened or closed by reasonably arranging the interlocks, and the tail gas is discharged from high altitude after being adsorbed by the adsorption tank, so that the intrinsic safety of the system is ensured, and the standard emission of the tail gas under the abnormal condition is also ensured.
Drawings
Fig. 1 is a schematic diagram of a pressurized conveying system for VOCs tail gas in an atmospheric tank of an intrinsically safe aromatic extraction device.
In the figure: the system comprises a 1-tail gas conveying main pipe, a 2-tail gas treatment facility, a 3-normal pressure tank, a 4-single-breathing valve, a 5-VOCs gas branch line, a 6-flame arrester, a 7-tail gas collecting pipe, an 8-flame arrester, a 9-tail gas liquid separating tank, a 10-booster fan inlet main pipe, an 11-booster fan, a 12-adsorption tank, a 13-nitrogen sweeping line, a 14-switching valve, a 15-temperature transmitter, a 16-switching valve, a 17-on-line oxygen analyzer, a 18-on-line oxygen analyzer, a 19-cooler, a 20-pressure transmitter, a 21-flow transmitter, a 22-switching valve, a 23-flame arrester, a 24-regulating valve, a 25-pressure transmitter, a 26-switching valve, a 27-liquid level transmitter, a 28-light dirty oil main pipe, a 29-frequency converter, a 30-circulating water pipeline, a 31-regulating valve, a 32-temperature transmitter, a 33-condensate discharging pipe, a CWS-circulating water supply and CWR-circulating water return.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed" on another element, it can be directly disposed or connected to the other element or intervening elements may also be present. The terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Referring to fig. 1, an essential safety type aromatic hydrocarbon extraction device normal pressure tank VOCs tail gas pressurizing and conveying system, the pressurized VOCs tail gas is communicated with a tail gas treatment facility 2 through a tail gas conveying main pipe 1, and the VOCs tail gas is treated and discharged after reaching standards.
So set up, aromatic extraction device normal pressure jar VOCs tail gas booster transport system has solved the emission of polluted waste gas, has reduced the pollution to the environment, guarantees tail gas booster transport process intrinsically safe, avoids the device to build alone tail gas treatment measure again and causes the problem that investment is high, the energy consumption is high.
Wherein, the gaseous phase in the top of the normal pressure tank 3 is communicated with a gaseous phase branch line 5 of VOCs, the gaseous phase branch line 5 is communicated with a tail gas collecting pipe 7, and a single breather valve 4, a flame arrester 6 and a flame arrester 8 are arranged.
Specifically, the gas at the top of the normal pressure tank 3 is discharged to the VOCs gas phase branch line 5 through the single breather valve 4, a flame arrester 6 is arranged close to the gas phase branch line of the normal pressure tank 3, and each path of VOCs gas phase branch line 5 is obliquely connected to the top of the pipeline of the tail gas collecting pipe 7 at an angle of 45 degrees. By the arrangement, the tail gas of each normal pressure tank is prevented from being directly communicated, potential safety hazards caused by mutual oil gas strings of the normal pressure tanks are eliminated, and intrinsic safety of the normal pressure tanks and the tail gas pressurizing and conveying system is ensured.
The gas phase at the top of the tail gas liquid separating tank 9 is provided with two paths, one path is communicated with the booster fan 11, the other path is communicated with the adsorption tank 12, the tank wall of the tail gas liquid separating tank 9 is communicated with the nitrogen sweeping line 13, the tank wall is provided with an on-line oxygen analyzer 17, and the liquid phase at the bottom is communicated with the light dirty oil main pipe 28.
Specifically, the tail gas from the collecting main pipe is subjected to gas-liquid separation in the tail gas liquid separating tank 9, one path of the separated tail gas is communicated with the booster fan 11 through the booster fan inlet main pipe 10, the other path of the separated tail gas is communicated with the adsorption tank 12 through the switch valve 14, the tank wall is communicated with the nitrogen blowing line 13 through the switch valve 16, and the interlocking signals for opening the switch valves 14 and 15 come from the on-line oxygen analyzers 17 and 18 and the stop signals of the booster fan 11. The liquid phase at the bottom of the tail gas liquid separating tank 9 is communicated with a light dirty oil main pipe 28 through a liquid level switch valve 26. The device is arranged in such a way, the gas-liquid separation of the tail gas is realized, the safe operation of the booster fan is ensured, the liquid-phase hydrocarbon components are recycled to the light dirty oil system, the loss of the hydrocarbon components of the device is reduced, and meanwhile, under the conditions that the fault shutdown of the tail gas booster fan and the exceeding of the oxygen content of the tail gas are ensured, the intrinsic safety of the tail gas conveying system and the emission of the tail gas meeting the environmental protection standard reach the standard are ensured.
The pressurized tail gas is communicated with a shell layer of the cooler 19, an outlet of the shell layer of the cooler 19 is divided into two paths, one path is communicated with a gas phase of the tail gas liquid separating tank 9, and the other path is communicated with the tail gas conveying main pipe 1.
Specifically, after the pressurized tail gas is cooled to 40 ℃ in a shell layer of the cooler 19, the gas phase is divided into 2 paths, one path is communicated with the gas phase of the tail gas liquid separating tank 9 through a regulating valve 24, and a control signal of the regulating valve 24 is sent from a pressure transmitter 25; one path is communicated with a tail gas conveying main pipe 1, the tail gas conveying main pipe 1 is provided with a flow transmitter 21, a switching valve 22, a flame arrester 23 and an online oxygen analyzer 18, and an interlocking signal of the switching valve 22 is from shutdown signals of the online oxygen analyzers 17 and 18 and a booster fan 11; the shell liquid phase of the cooler 19 is communicated with the tail gas liquid separating tank 9 through the condensate discharging pipe 33, so that the arrangement ensures the stable air quantity of the booster fan, avoids frequent start and stop of the fan and faults, and ensures the intrinsic safety of a tail gas conveying main pipe and a booster fan unit.
Wherein the pressure transmitter 20 is in communication with a frequency converter 29, and the level switch valve 26 is in signal communication with a level transmitter 27.
Specifically, the control section is respectively communicated with the on-line oxygen analyzer 17, the on-line oxygen analyzer 18, the pressure transmitter 20, the pressure transmitter 25, the flow transmitter 21, the liquid level transmitter 27, the temperature transmitter 15, the temperature transmitter 32, the frequency converter 29, the on-off valve 14, the on-off valve 16, the on-off valve 22, the on-off valve 26, the regulating valve 26, and the regulating valve 31. The pressure transmitter 25, the on-line oxygen analyzer 17, the on-line oxygen analyzer 18, and the temperature transmitter 15 are connected to an alarm device through a control section.
Specifically, the activated carbon is filled in the liquid separating tank 12, the temperature transmitter 14 is arranged, the adsorption efficiency of the activated carbon on hydrocarbons reaches 99.5%, the hydrocarbons are discharged into the atmosphere after being adsorbed, and the temperature of the adsorption tank is 55 ℃ when the alarm temperature is high. By the arrangement, the exhaust emission under abnormal working conditions is guaranteed to meet the requirements of GB 37822-2019 'emission control Standard of volatile organic compounds' and the spontaneous combustion risk of active carbon is prevented, and the intrinsic safety of the adsorption tank is guaranteed.
Specifically, the number of booster fans 11 is 2, and each booster needs to be provided with a manual/automatic change-over switch for the Roots blower, so that the booster in normal operation is in a manual state, and the standby booster is in an automatic start-stop state. Each processing amount is 100Nm at maximum 3 And/h, the frequency conversion range of the frequency converter 29 is 0-50 HZ, and when the pressure is increased to 1.3KPaG under the premise that the oxygen content in the oil gas is normal, the booster fan is adjusted to the rated frequency; when the pressure is reduced to 0.6KPaG, the fan frequency is adjusted to 40%; when the pressure is lower than 0.2KPaG, the bypass regulator valve 24 is actuated to regulate. The outlet pressure of the fan is 40KPaG。
Specifically, the liquid level transmitter 27 is provided with 1, and the switching condition of the liquid level switch valve 27 is that the liquid level is more than or equal to 70 percent and is less than or equal to 25 percent.
The processing procedure of the embodiment of the utility model is specifically described.
VOCs tail gas (0-100 Nm) 3 And/h) starting the normal pressure tank 3, when the pressure of the normal pressure tank 3 is more than 900PaG, opening the single-breathing valve 4, discharging tail gas to the VOCs gas phase branch line 5, separating the tail gas into two paths after the tail gas is separated by the tail gas separating tank 9, wherein one path is connected with the adsorption tank 12, the other path is connected with the inlet of the booster fan 11, and when the oxygen content of any oxygen analyzer of the tail gas booster conveying system is more than 2%V or the booster fan is stopped, the control system rapidly opens the switch valve 14, the switch valve 16 and closes the switch valve 22, and the tail gas is discharged from high altitude after being adsorbed by the adsorption tank 12; during normal production, tail gas is boosted by the booster fan 11, the inlet air quantity of the booster fan is regulated by the frequency converter 29, and when the pressure is increased to 1.3KPaG, the booster fan is regulated to the rated frequency; when the pressure is reduced to 0.6KPaG, the fan frequency is adjusted to 40%; when the pressure is lower than 0.2KPaG, the bypass regulator valve 24 is actuated to regulate. The tail gas is pressurized to 40KPaG and then enters the cooler 19 to exchange heat with circulating water, the circulating water pipeline 30 is provided with a temperature control valve 31, the opening of the temperature control valve 31 is regulated according to a temperature transmitter 32 of a tail gas outlet pipeline of the heat exchanger 19, the temperature of the cooled tail gas is guaranteed to be 40 ℃ and then is sent to a tail gas treatment device, the tail gas after treatment is discharged after reaching the standard, a shell layer of the cooler 19 is provided with a separation function, and condensate is discharged to the tail gas liquid separating tank 9 through a condensate discharging pipe 33. The liquid-phase hydrocarbon of the tail gas liquid-separating tank 9 controls the liquid-phase switch valve 26 to switch according to the liquid-phase transmitter 27, the normal production is carried out, the switch valve action signal is started when the liquid-phase transmitter reaches more than or equal to 70 percent, the liquid-phase hydrocarbon is closed when the liquid-phase hydrocarbon is less than or equal to 25 percent, and the discharged liquid-phase hydrocarbon is discharged to a device dirty oil tank through the light dirty oil main pipe 28.
The utility model achieves the following effects in implementation:
1. VOCs tail gas exhaled by the normal pressure tank is pressurized and conveyed to a tail gas treatment facility, so that the emission of polluted waste gas is reduced, the emission of toxic pollutants is reduced, the pollution to the environment is reduced, and the requirements of national environmental protection part for up-to-standard emission are met. Because the device normal pressure tank has small volume, stable normal operation, small tail gas amount and wide variation range, the problems of excessive investment and high energy consumption caused by independent installation of a set of tail gas treatment facilities are avoided.
2. As the tail gas of the VOCs in the normal pressure tank contains aromatic hydrocarbon such as benzene, the utility model adopts the Roots blower and the laser oxygen analyzer, thereby avoiding the generation of wastewater which is difficult to treat such as benzene-containing waste liquid and reducing the difficulty of wastewater treatment.
3. The reasonable control system is arranged, so that the oxygen content of the tail gas pressurizing and conveying system is ensured to be qualified, the reasonable adsorption tank is arranged, and the tail gas emission is ensured to reach the standard under abnormal working conditions, so that the system is intrinsically safe.
4. As an auxiliary facility of the device normal pressure tank, the booster fan is provided with a frequency converter, the normal operation is regulated by means of frequency conversion flow regulation, two kinds of deviation can be regulated by means of automatic control starting bypass control and the like, the fan is ensured to meet the air quantity change of the mixed gas, the energy can be effectively saved, the manual operation is reduced, and the automatic control is realized.
5. The method has the advantages of short flow, compact flow, intrinsic safety and reliable operation, and is worthy of popularization in the treatment of the tail gas of the normal pressure tank of the aromatic hydrocarbon extraction device in the petrochemical industry.
The embodiments of the present utility model are merely described in terms of preferred embodiments of the present utility model, and are not intended to limit the spirit and scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope of the present utility model, and the technical content of the present utility model as claimed is fully described in the claims.
Claims (8)
1. The utility model provides an essential safety formula aromatic extraction device normal pressure jar VOCs tail gas booster delivery system, mainly by normal pressure jar, singly breathe the suction valve, VOCs gas phase branch line, flame arrester, tail gas collecting pipe, tail gas liquid separating pot, booster fan, tail gas delivery house steward, online oxygen analyzer, pressure transmitter, liquid level transmitter, ooff valve, governing valve, cooler, flow transmitter, adsorption tank, temperature transmitter, alarm device, converter, DCS control system constitute, its characterized in that:
each normal pressure tank of the aromatic hydrocarbon extraction device is provided with a VOCs gas phase branch line which is communicated with a tail gas collecting pipe, and the tail gas collecting pipe is communicated with a tail gas liquid separating tank; the gas phase outlet at the top of the tail gas liquid separating tank is provided with two paths, one path is communicated with a booster fan, the other path is communicated with an adsorption tank, the bottom liquid phase outlet is communicated with a device light dirty oil main pipe through a switch valve, the wall of the tail gas liquid separating tank is provided with a nitrogen purging port, the nitrogen purging port is communicated with a nitrogen purging line through the switch valve, the outlet pipeline of the booster fan is communicated with the inlet of a cooler, the outlet path of the cooler is communicated with the gas phase of the tail gas liquid separating tank through a regulating valve, the shell liquid phase of the cooler is communicated with the tail gas liquid separating tank, the other path is communicated with a downstream tail gas treatment facility through a tail gas conveying main pipe, and the top outlet of the adsorption tank is communicated with the atmosphere; the tail gas separating tank is provided with an online oxygen analyzer and a pressure transmitter in a gas phase, a liquid level transmitter is arranged in a liquid phase, a pressure transmitter is arranged in an inlet collecting pipe of the booster fan, a flow transmitter, a temperature transmitter, an online oxygen analyzer and a switch valve are arranged in a tail gas conveying main pipe, and a frequency converter is connected with a motor of the tail gas booster; the DCS control system is respectively connected with the switch valve, the regulating valve, the pressure transmitter, the online oxygen analyzer, the temperature transmitter and the frequency converter.
2. The pressure boosting and conveying system for VOCs tail gas in an atmospheric tank of an intrinsically safe aromatic extraction device according to claim 1, wherein the atmospheric tank is provided with a nitrogen sealing system, a top gas phase outlet is provided with the single-breathing valve, and a gas phase branch line is provided with a flame arrester close to a storage tank, and the type is bidirectional detonation blocking.
3. The pressure boosting conveying system for VOCs tail gas of an atmospheric tank of an intrinsically safe aromatic extraction device according to claim 1, wherein the tail gas collecting pipe is provided with a flame arrester, and the type of the flame arrester is bidirectional detonation-proof.
4. The intrinsically safe aromatic extraction device atmospheric tank VOCs tail gas pressurized transport system of claim 1, wherein the on-line oxygen analyzer is a laser oxygen analyzer.
5. The pressure boosting and conveying system for VOCs tail gas of an atmospheric tank of an intrinsically safe aromatic extraction device according to claim 1, wherein the pressure boosting fans are Roots fans, the number of the pressure boosting fans is 2, and manual/automatic change-over switches are arranged; and a double-end mechanical seal is adopted.
6. The pressure boosting and conveying system for VOCs tail gas in an atmospheric tank of an intrinsically safe aromatic extraction device according to claim 1, wherein the tail gas booster adopts a variable frequency motor, and the variable frequency range is 0-50 HZ.
7. The pressurized transportation system for VOCs tail gas of an atmospheric tank of an intrinsically safe aromatic extraction device according to claim 1, wherein the adsorption tank is filled with active carbon and is provided with a temperature transmitter.
8. The pressure boosting and conveying system for VOCs tail gas in an atmospheric tank of an intrinsically safe aromatic extraction device according to claim 1, wherein the cooler is a tube type heat exchanger and is provided with a separation function facility and a liquid outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321133027.9U CN219976147U (en) | 2023-05-11 | 2023-05-11 | VOCs tail gas supercharging conveying system of constant pressure tank of intrinsically safe aromatic extraction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321133027.9U CN219976147U (en) | 2023-05-11 | 2023-05-11 | VOCs tail gas supercharging conveying system of constant pressure tank of intrinsically safe aromatic extraction device |
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| CN219976147U true CN219976147U (en) | 2023-11-07 |
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|---|---|---|---|
| CN202321133027.9U Active CN219976147U (en) | 2023-05-11 | 2023-05-11 | VOCs tail gas supercharging conveying system of constant pressure tank of intrinsically safe aromatic extraction device |
Country Status (1)
| Country | Link |
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| CN (1) | CN219976147U (en) |
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2023
- 2023-05-11 CN CN202321133027.9U patent/CN219976147U/en active Active
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