CN210045028U - VOCs recovery processing device of refining enterprise - Google Patents
VOCs recovery processing device of refining enterprise Download PDFInfo
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- CN210045028U CN210045028U CN201920331309.7U CN201920331309U CN210045028U CN 210045028 U CN210045028 U CN 210045028U CN 201920331309 U CN201920331309 U CN 201920331309U CN 210045028 U CN210045028 U CN 210045028U
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Abstract
The utility model provides a VOCs recovery processing device of refining enterprise, adopt the mode of "level four condensation + two-stage absorption + desorption gas cycle condensation absorption" to handle VOCs gas, the while has still adopted difficult shutoff, VOCs gas trafficability characteristic is good and the better condenser of corrosion resistance, the device global design is reasonable, it is stable for a long time to have the equipment operation, environmental protection and energy saving, area is little, the advantage that the equipment investment rate of return is high, the use of cooperation processing method, the gaseous purification rate of VOCs can reach 97% height, realize the discharge to reach standard of tail gas far away.
Description
Technical Field
The utility model relates to a VOCs recovery processing device of refining enterprise belongs to the VOCs of refining enterprise and retrieves technical field.
Background
The refining enterprises crack the petroleum into different products such as gasoline, diesel oil, kerosene, petroleum gas, ethylene and the like through high-temperature fractionation, such as lubricating oil, paraffin and asphalt which are byproducts of petroleum refining, VOCs can be volatilized in the production links, the transportation links and the storage links of the products, and the VOCs have complex components and odor and are harmful to human bodies and natural environments.
The traditional methods for treating VOCs at home and abroad comprise absorption, adsorption, catalytic combustion, biological methods and the like, but the traditional methods have respective defects and limit the wide popularization and application. The specific defects are as follows: 1. the absorption and adsorption method has the problems of secondary pollution of the old absorbent and the old adsorbent, and the absorbent and the adsorbent are frequently replaced, so that the daily operation cost is high; 2. the catalytic combustion method has the characteristics of large one-time investment, high operating cost and the like, and the use of small and medium-sized enterprises is also limited; 3. the equipment for removing VOCs by a biological method occupies a large area, the removal rate is easily influenced by factors such as waste gas concentration and waste gas toxicity, and the prior treatment technology cannot meet the emission standard.
Disclosure of Invention
The utility model aims at prior art's the aforesaid is not enough, a processing apparatus and processing method to the VOCs of refining enterprise are provided, this processing apparatus adopts "level four condensation + two-stage absorption + desorption gas circulation condensation absorption"'s mode to handle the VOCs gas, difficult shutoff has still been adopted simultaneously, the gaseous good condenser that reaches the corrosion resistance of passing through of VOCs, the device global design is reasonable, it is long and stable to have equipment operation, environmental protection and energy saving, area is little, the high advantage of equipment investment return rate, the gaseous purification rate of its VOCs can reach 97% height, realize the discharge to reach standard of tail gas far away.
In order to achieve the above object, the utility model discloses the technical solution who adopts is:
a VOCs recovery processing device for refining enterprises comprises a collecting system, a condensation recovery system, an adsorption system, a desorption system and a tail gas discharge system, wherein the collecting system, the condensation recovery system and the adsorption system are connected in sequence;
the condensation recovery system comprises a precooler, a primary refrigerating unit, a primary condenser, a secondary refrigerating unit, a secondary condenser, a tertiary refrigerating unit, a tertiary condenser, a liquid discharge valve, a temporary storage tank and an oil pump; the first inlet of the precooler is connected with the outlet of the collecting system through a pipeline, the first outlet of the precooler is connected with the VOCs gas inlet of the first-stage condenser through a pipeline, the VOCs gas outlet of the first-stage condenser is connected with the VOCs gas inlet of the second-stage condenser through a pipeline, the VOCs gas outlet of the second-stage condenser is connected with the VOCs gas inlet of the third-stage condenser through a pipeline, the VOCs gas outlet of the third-stage condenser is connected with the second inlet of the precooler through a pipeline, and the first-stage refrigerating unit, the second-stage refrigerating unit and the third-stage refrigerating unit are respectively connected with the first-stage condenser, the second-stage condenser; the VOCs liquid outlets of the precooler, the primary condenser, the secondary condenser and the tertiary condenser are respectively connected with the inlet of the temporary storage tank through a pipeline with a liquid discharge valve, and the outlet of the temporary storage tank is connected with the VOCs liquid outlet of the refining enterprise through a pipeline with an oil pump; the precooler, the first-stage condenser, the second-stage condenser and the third-stage condenser all adopt tube-fin heat exchangers, the finned tubes and the shell of each tube-fin heat exchanger are all made of stainless steel, and in each tube-fin heat exchanger, refrigerant flows through a tube side, and VOCs in refining enterprises flow through a shell side and flow in opposite directions;
the adsorption system comprises an air inlet valve, a primary adsorption tank, a primary discharge valve, a secondary adsorption tank and a secondary discharge valve, wherein the inlet of the air inlet valve is connected with the second outlet of the precooler through a pipeline, the outlet of the air inlet valve is connected with the inlet of the primary adsorption tank through a pipeline, the outlet of the primary adsorption tank is connected with the inlet of the discharge valve through a pipeline, the outlet of the discharge valve is connected with the inlet of the secondary adsorption tank through a pipeline, and the outlet of the secondary adsorption tank is connected with the tail gas discharge system through a pipeline with the secondary discharge valve.
Preferably, the collecting system comprises a pre-stage flame arrester and an induced draft fan, wherein the inlet of the pre-stage flame arrester is connected with the VOCs inlet of the refining and chemical enterprise through a pipeline, the inlet of the induced draft fan is connected with the outlet of the pre-stage flame arrester through a pipeline, and the outlet of the induced draft fan is connected with the first inlet of the precooler through a pipeline; be provided with preceding stage sample branch line on the pipeline between smelting and chemical enterprises VOCs import and the preceding stage spark arrester, the middle section of preceding stage sample branch line is provided with preceding stage sample valve, and the outer tip of preceding stage sample branch line is preceding stage sample connection.
Preferably, the desorption system is including brokenly empty valve, the one-level adsorption tank, the one-level desorption valve, the second grade adsorption tank, second grade desorption valve and vacuum pump, the import of one-level desorption valve is passed through the pipeline and is linked to each other with the import of one-level adsorption tank, the export of one-level desorption valve is passed through the pipeline and is linked to each other with the vacuum pump import, the vacuum pump export is passed through the pipeline and is linked to each other with brokenly empty valve import, the import that the second grade adsorption tank was passed through to the second grade desorption valve links to each other with the vacuum pump through the pipeline import, second grade desorption valve and.
Preferably, the tail gas emission system comprises a rear-stage flame arrester and an emission barrel, an inlet of the rear-stage flame arrester is connected with an outlet of the secondary emission valve through a pipeline, and an outlet of the flame arrester is connected with an inlet of the emission barrel through a pipeline; a rear-stage sampling branch pipeline is arranged on the pipeline between the flame arrester and the second-stage discharge valve, a rear-stage sampling valve is arranged in the middle section of the rear-stage sampling branch pipeline, and the outer end part of the rear-stage sampling branch pipeline is a rear-stage sampling port.
Preferably, in the condensation recovery system, the precooler, the first-stage condenser, the second-stage condenser and the third-stage condenser are all designed in an explosion-proof manner; in the adsorption system, the first-stage adsorption tank consists of two adsorption tanks which are arranged in parallel and independently perform adsorption and desorption operations, and the second-stage adsorption tank consists of one adsorption tank.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses processing apparatus adopts the mode of "level four condensation + two-stage absorption + desorption gas cycle condensation absorption" to handle the VOCs gas, has still adopted difficult shutoff simultaneously, the gaseous good condenser with the corrosion resistance is better of VOCs trafficability characteristic, the device overall design is reasonable, have the permanent stability of equipment operation, environmental protection and energy saving, area is little, the advantage that the equipment investment rate of return is high, the gaseous purification rate of its VOCs can reach 97% height, realize the discharge to reach standard of tail gas far away.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the interior of the condenser of the present invention.
In the figure, an oil pump 1, a VOCs liquid outlet 2 of an oil refinery, a pre-stage flame arrester 3, a VOCs inlet 4 of the oil refinery, a pre-stage sampling valve 5, a pre-stage sampling port 6, an induced draft fan 7, a precooler 8, a first-stage refrigerating unit 9, a first-stage condenser 10, a second-stage refrigerating unit 11, a second-stage condenser 12, a third-stage refrigerating unit 13, a third-stage condenser 14, a post-stage sampling valve 15, a post-stage sampling port 16, a post-stage flame arrester 17, a discharge cylinder 18, a second-stage adsorption tank 19, a hand valve 20, a first-stage discharge valve 21, a blow-down valve 22, a first-stage adsorption tank 23, a desorption valve 24, an air inlet valve 25, a vacuum valve 26, a liquid discharge valve 27, a temporary storage tank 28, a fin 29, a VOCs inlet 30 of a condenser, a refrigerant pipeline 31, a refrigerant outlet 32.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, a recovery processing device for VOCs in a refinery comprises a collection system, a condensation recovery system, an adsorption system, a desorption system and a tail gas discharge system, wherein the collection system, the condensation recovery system and the adsorption system are connected in sequence;
the condensation recovery system comprises a precooler 8, a primary refrigerating unit 9, a primary condenser 10, a secondary refrigerating unit 11, a secondary condenser 12, a tertiary refrigerating unit 13, a tertiary condenser 14, a drain valve 27, a temporary storage tank 28 and an oil pump 1; a first inlet of the precooler 8 is connected with an outlet of the collecting system through a pipeline, a first outlet of the precooler 8 is connected with a VOCs gas inlet of the first-stage condenser 10 through a pipeline, a VOCs gas outlet of the first-stage condenser 10 is connected with a VOCs gas inlet of the second-stage condenser 12 through a pipeline, a VOCs gas outlet of the second-stage condenser 12 is connected with a VOCs gas inlet of the third-stage condenser 14 through a pipeline, a VOCs gas outlet of the third-stage condenser 14 is connected with a second inlet of the precooler 8 through a pipeline, and the first-stage refrigerating unit 9, the second-stage refrigerating unit 11 and the third-stage refrigerating unit 13 are respectively connected with the first-stage condenser 10, the second-stage condenser 12 and; the VOCs liquid outlets of the precooler 8, the primary condenser 10, the secondary condenser 12 and the tertiary condenser 14 are respectively connected with the inlet of the temporary storage tank 28 through a pipeline with a liquid discharge valve 27, and the outlet of the temporary storage tank 28 is connected with the VOCs liquid outlet 2 of the refining enterprise through a pipeline with an oil pump 1; the precooler 8, the first-stage condenser 10, the second-stage condenser 12 and the third-stage condenser 14 all adopt tube-fin heat exchangers, the finned tubes and the shells of the tube-fin heat exchangers are all made of stainless steel, refrigerant in the tube-fin heat exchangers goes through the tube side, VOCs in refining enterprises go through the shell side, and the refrigerant and the VOCs in the refining enterprises flow in opposite directions;
the adsorption system comprises an air inlet valve 25, a primary adsorption tank 23, a primary discharge valve 21, a secondary adsorption tank 19 and a secondary discharge valve, an inlet of the air inlet valve 25 is connected with a second outlet of the precooler 8 through a pipeline, an outlet of the air inlet valve 25 is connected with an inlet of the primary adsorption tank 23 through a pipeline, an outlet of the primary adsorption tank 23 is connected with an inlet of the primary discharge valve 21 through a pipeline, an outlet of the primary discharge valve 21 is connected with an inlet of the secondary adsorption tank 19 through a pipeline, and an outlet of the secondary adsorption tank 19 is connected with the tail gas discharge system through a pipeline with the secondary discharge valve.
According to the preferable technical scheme, the collecting system comprises a pre-stage flame arrester 3 and an induced draft fan 7, wherein an inlet of the pre-stage flame arrester 3 is connected with an inlet 4 of VOCs (volatile organic compounds) of a refining enterprise through a pipeline, an inlet of the induced draft fan 7 is connected with an outlet of the pre-stage flame arrester 3 through a pipeline, and an outlet of the induced draft fan 7 is connected with a first inlet of a precooler 8 through a pipeline; be provided with preceding stage sample branch line on the pipeline between refining enterprise's VOCs import 4 and preceding stage spark arrester 3, the middle section of preceding stage sample branch line is provided with preceding stage sample valve 5, and the outer tip of preceding stage sample branch line is preceding stage sample connection 6.
As preferred technical scheme, desorption system is including breaking empty valve 22, one-level adsorption tank 23, one-level desorption valve 24, second grade adsorption tank 19, second grade desorption valve 20 and vacuum pump 26, 24 imports of one-level desorption valve pass through the pipeline and link to each other with 23 imports of one-level adsorption tank, 24 exports of one-level desorption valve pass through the pipeline and link to each other with 26 imports of vacuum pump, 26 exports of vacuum pump pass through the pipeline and link to each other with 7 imports of draught fan, 23 exports of one-level adsorption tank pass through the pipeline and link to each other with 22 imports of breaking empty valve, second grade desorption valve 20 passes through the pipeline and links to each other with 19 imports of second grade adsorption tank and vacuum pump.
The tail gas emission system comprises a rear-stage flame arrester 17 and an emission barrel 18, wherein the inlet of the rear-stage flame arrester 17 is connected with the outlet of a secondary emission valve through a pipeline, and the outlet of the flame arrester 17 is connected with the inlet of the emission barrel 18 through a pipeline; a rear-stage sampling branch pipeline is arranged on a pipeline between the flame arrester 17 and the second-stage discharge valve, a rear-stage sampling valve 15 is arranged in the middle section of the rear-stage sampling branch pipeline, and a rear-stage sampling port 16 is arranged at the outer end part of the rear-stage sampling branch pipeline.
As the preferred technical scheme, in the condensation recovery system, a precooler 8, a first-stage condenser 10, a second-stage condenser 12 and a third-stage condenser 14 are all in an explosion-proof design; in the adsorption system, the first-stage adsorption tank 23 is composed of two adsorption tanks which are arranged in parallel and independently perform adsorption and desorption operations, and the second-stage adsorption tank 19 is composed of one adsorption tank.
Example 1
In the following example 1, the following explanation will be made in further detail by taking the VOCs of the refinery enterprise having non-methane total hydrocarbon concentration of 300g/m, gas flow of 300 Nm/h and temperature of 30 ℃ as the source for processing the gas inlet example, but the present invention is also applicable to the recovery processing device of the ultra-low emission standard of VOCs of the refinery enterprise having different gas volumes, different concentrations, different temperatures and different components.
As shown in figure 1, a VOCs recovery processing device of refining enterprise, including collection system, condensation recovery system, adsorption system, desorption system and exhaust emission system:
the collection system comprises a preceding stage flame arrester 3 and an induced draft fan 7, wherein the inlet of the preceding stage flame arrester 3 is connected with the VOCs inlet 4 of the refining enterprise through a pipeline, and the inlet of the induced draft fan 7 is connected with the outlet of the preceding stage flame arrester 3 through a pipeline; VOCs of the refining enterprises enter a precooler 8 through a front-stage flame arrester 3 and an induced draft fan 7 to be subjected to preliminary cooling, and the temperature is reduced from 30 ℃ to about 3 ℃; an explosion-proof centrifugal fan with the flow of at least 300 Nm/h is selected as the induced draft fan 7, and VOCs of the refining and chemical enterprises are collected and pressurized to about 20Kpa at most;
the condensation recovery system comprises a precooler 8, a primary refrigerating unit 9, a primary condenser 10, a secondary refrigerating unit 11, a secondary condenser 12, a tertiary refrigerating unit 13, a tertiary condenser 14, a liquid discharge valve 27, a temporary storage tank 28 and an oil pump 1, wherein a first inlet of the precooler 8 is connected with an outlet of a draught fan 7 through a pipeline, a first outlet of the precooler 8 is connected with a VOCs gas inlet of the primary condenser 10 through a pipeline, a VOCs gas outlet of the primary condenser 10 is connected with a VOCs gas inlet of the secondary condenser 12 through a pipeline, a VOCs gas outlet of the secondary condenser 12 is connected with a VOCs gas inlet of the tertiary condenser 14 through a pipeline, a VOCs gas outlet of the tertiary condenser 14 is connected with a second inlet of the precooler 8 through a pipeline, a refrigerant outlet of the primary refrigerating unit 9 is connected with a refrigerant inlet of the primary condenser 10 through a pipeline, a refrigerant inlet of the primary refrigerating unit 9 is connected with a, the refrigerant outlet of the second-stage refrigerating unit 11 is connected with the refrigerant inlet of the second-stage condenser 12 through a pipeline, the refrigerant inlet of the second-stage refrigerating unit 11 is connected with the refrigerant outlet of the second-stage condenser 12 through a pipeline, the refrigerant outlet of the third-stage refrigerating unit 13 is connected with the refrigerant inlet of the third-stage condenser 14 through a pipeline, the refrigerant inlet of the third-stage refrigerating unit 13 is connected with the refrigerant outlet of the third-stage condenser 14 through a pipeline, the VOCs liquid outlet of the refining enterprise of the precooler 8 is connected with the inlet of the drain valve 27 through a pipeline, the VOCs liquid outlet of the refining enterprise of the first-stage condenser 10 is connected with the inlet of the drain valve 27 through a pipeline, the VOCs liquid outlet of the refining enterprise of the second-stage condenser 12 is connected with the inlet of the drain valve 27 through a pipeline, the outlets of the drain valves 27 (four in total) are connected with the inlet of the, the outlet of the pump 1 is connected with a VOCs recovery liquid outlet 2 of the refining enterprise through a pipeline;
VOCs of the refining enterprise is cooled by four stages, and the VOCs liquid of the refining enterprise condensed is discharged into a temporary storage tank 28 by opening a liquid discharge valve 27 through interfaces below the precooler 8, the first-stage condenser 10, the second-stage condenser 12 and the third-stage condenser 14 at irregular intervals, so that the situation that the accumulated liquid in each condenser is too much to cause blockage is avoided. And the liquid level of the temporary storage tank 28 is interlocked with the opening and closing of the pump 1, and when the liquid level rises to a set value, the temporary storage tank is opened and is closed below the set value, and the operation is fully automatic.
VOCs of the refining enterprise sequentially passes through the four heat exchangers: the precooler 8, the first-stage condenser 10, the second-stage condenser 12 and the third-stage condenser 14 condense, and the outlet temperature values of the four-stage condensed gas are 3 ℃, 20 ℃, 40 ℃ and 75 ℃ in sequence. Low-temperature VOCs noncondensable gas at-75 ℃ from the three-stage condenser 14 transmits cold energy to VOCs of an induced draft fan for pressurizing refining enterprises through the precooler 8, the temperature of the VOCs is reduced from 30 ℃ to about 3 ℃, and partial hydrocarbons and most water in the VOCs are condensed and phase-changed into liquid; the first-stage refrigerating unit 9 provides cold energy for the first-stage condenser 10 to condense the entering VOCs from 3 ℃ to-20 ℃, and partial hydrocarbons and partial water in the VOCs are condensed and phase-changed into liquid; the secondary refrigerating unit 11 provides cold energy for the secondary condenser 12 to condense the entering VOCs from minus 20 ℃ to minus 40 ℃, and partial hydrocarbons and a small part of water in the VOCs are condensed and phase-changed into liquid; the three-stage refrigerating unit 13 provides cold energy for the three-stage condenser 14 to condense the entering VOCs from-40 ℃ to-75 ℃, and most of hydrocarbons and a small part of water in the VOCs are condensed and phase-changed into liquid;
the precooler 8, the first-stage condenser 10, the second-stage condenser 12 and the third-stage condenser 14 all adopt tube-fin heat exchangers shown in fig. 2, fins 29 and a refrigerant pipeline 31 are welded into an integral finned tube, VOCs of refining enterprises enter a condenser VOCs channel 33 inside the heat exchanger through a condenser VOCs inlet 30 to exchange heat with refrigerant in the refrigerant pipeline 31 so as to be condensed, wherein the refrigerant enters the heat exchanger from a refrigerant inlet 34, flows through the refrigerant pipeline 31 and finally flows out from a refrigerant outlet 32, VOCs liquid after condensation is discharged out of the heat exchanger through a liquid discharge port 36, and uncondensed non-condensable gas flows into a next processing device through a refrigerant condenser VOCs outlet 35.
VOCs of the refining enterprises exchange heat with the refrigerant in the refrigerant pipeline 31 through the VOCs channels 33 of the condensers in the four condensers to condense out all components in sequence. The composition of the VOCs in the refining and chemical enterprises is more complex, some melting points are higher, some melting points are lower, and the content of water vapor contained in the VOCs is different due to different refining processes, geographical environments and field working conditions, so that the VOCs in the refining and chemical enterprises can have the phenomenon that the composition is solidified and frosted in four condensers, however, in the finned tube type heat exchanger, the VOCs in the refining and chemical enterprises flow through a channel which is a finned channel, the structural characteristics of the VOCs are that the shell side is commonly referred to in the heat exchanger, the space is large, the flow section is much larger than that of a plate type heat exchanger commonly used in the industry at present, and the medium is solidified and frosted without blockage, so that only one plate is needed to be replaced.
VOCs of refining enterprise all condenses the storage in the jar of keeping in through the level four condensation, almost all VOCs hydrocarbons of refining enterprise, and only a small part of hydrocarbons do not condense and still exist in noncondensable gas with the gaseous phase, and non-methane total hydrocarbon concentration descends to within 10g/m year by 100g/m that gets into the device, and the VOCs recovery processing efficiency of refining enterprise reaches more than 90%.
The adsorption system comprises a primary discharge valve 21, an air inlet valve 25, a primary adsorption tank 23, a secondary adsorption tank 19 and a secondary discharge valve, wherein a second outlet of the precooler 8 is connected with an inlet of the air inlet valve 25 through a pipeline, an outlet of the air inlet valve 25 is connected with an inlet of the primary adsorption tank 23 through a pipeline, an outlet of the primary adsorption tank 23 is connected with an inlet of the primary discharge valve 21 through a pipeline, and an outlet of the primary discharge valve 21 is connected with an inlet of the secondary adsorption tank 19 through a pipeline; and (3) enabling residual non-condensable gas after four-stage condensation of VOCs of the refining enterprises to pass through two layers of adsorption tank activated carbon beds, and reducing the concentration of the non-methane total hydrocarbons in the residual tail gas from 10g/m to within 120mg/m during the whole year of the whole year, so that the up-to-standard emission is completed.
The desorption system comprises a break valve 22, a first-stage desorption valve 24, a first-stage adsorption tank 23, a second-stage adsorption tank 19, a second-stage desorption valve 20 and a vacuum pump 26, the inlet of the first-stage desorption valve 24 is connected with the inlet of the first-stage adsorption tank 23 through a pipeline, the outlet of the first-stage desorption valve 24 is connected with the inlet of the vacuum pump 26 through a pipeline, the outlet of the vacuum pump 26 is connected with the inlet of the induced draft fan 7 through a pipeline, the inlet of the break valve 22 is connected with the outlet of the first-stage adsorption tank 23 through a pipeline, the inlet of the second-stage adsorption tank 19 is connected with the inlet of the second-stage desorption valve 20 through;
the adsorption tanks are provided with three adsorption tanks according to two stages, the one-level is provided with two adsorption tanks, the second level is provided with one adsorption tank, and the interior of the adsorption tank is filled with special activated carbon for recovering VOCs of the refining enterprise. In the first-stage adsorption, one carbon bed is in an adsorption working state, the other carbon bed is in a desorption state, when VOCs of refinery enterprises enter the carbon beds, hydrocarbons in the VOCs are adsorbed by activated carbon, and air directly passes through the carbon layer and is discharged into the atmosphere. When the "adsorbing" carbon bed is close to saturation, the "adsorbing" carbon bed is switched to desorption state, and at the same time, the original "desorbing" carbon bed is regenerated and switched to VOCs adsorption state. The switching of the two adsorption tanks is completed by a logic control system so as to ensure that VOCs of the refining enterprises which continuously enter the device are recovered. VOCs of the refining enterprise passes through the first-level adsorption carbon layer and then enters the second-level adsorption carbon layer through the first-level discharge valve 21 for further adsorption, and the concentration of VOCs of the refining enterprise is greatly reduced after the VOCs passes through the second-level adsorption.
The tail gas emission system comprises a rear-stage flame arrester 17 and an emission barrel 18, wherein an inlet of the rear-stage flame arrester 17 is connected with a secondary emission valve on an outlet pipeline of a secondary adsorption tank 19 through a pipeline, and an outlet of the flame arrester 17 is connected with an inlet of the emission barrel 18 through a pipeline; according to the national standard GB31570-2015 discharge Standard of pollutants for oil refining industry, the discharge Standard of atmospheric pollutants for oil refining enterprises is that total non-methane hydrocarbons do not exceed 120mg/m
3And the height of the discharge cylinder is 15 meters, and the tail gas of VOCs of the refining enterprises is discharged into the atmosphere after passing through a flame arrester and the discharge cylinder of 15 meters after four-stage condensation and two-stage adsorption.
The above description is made for further details of the present invention with reference to the specific embodiments, and it should not be considered that the embodiments of the present invention are limited to these descriptions, and for those skilled in the art to which the present invention pertains, the simple replacement made without departing from the concept of the present invention should be considered as belonging to the protection scope of the present invention.
Claims (5)
1. A VOCs recovery processing device for refining enterprises comprises a collecting system, a condensation recovery system, an adsorption system, a desorption system and a tail gas discharge system, wherein the collecting system, the condensation recovery system and the adsorption system are connected in sequence; the method is characterized in that:
the condensation recovery system comprises a precooler (8), a primary refrigerating unit (9), a primary condenser (10), a secondary refrigerating unit (11), a secondary condenser (12), a tertiary refrigerating unit (13), a tertiary condenser (14), a liquid discharge valve (27), a temporary storage tank (28) and an oil pump (1); a first inlet of the precooler (8) is connected with an outlet of the collecting system through a pipeline, a first outlet of the precooler (8) is connected with a VOCs gas inlet of the first-stage condenser (10) through a pipeline, a VOCs gas outlet of the first-stage condenser (10) is connected with a VOCs gas inlet of the second-stage condenser (12) through a pipeline, a VOCs gas outlet of the second-stage condenser (12) is connected with a VOCs gas inlet of the third-stage condenser (14) through a pipeline, a VOCs gas outlet of the third-stage condenser (14) is connected with a second inlet of the precooler (8) through a pipeline, and the first-stage refrigerating unit (9), the second-stage refrigerating unit (11) and the third-stage refrigerating unit (13) are respectively connected with the first-stage condenser (10), the second-stage condenser (12) and the third-stage condenser (14) through pipelines; VOCs liquid outlets of the precooler (8), the primary condenser (10), the secondary condenser (12) and the tertiary condenser (14) are respectively connected with an inlet of a temporary storage tank (28) through a pipeline with a liquid discharge valve (27), and an outlet of the temporary storage tank (28) is connected with a VOCs liquid outlet (2) of a refining enterprise through a pipeline with an oil pump (1); the precooler (8), the primary condenser (10), the secondary condenser (12) and the tertiary condenser (14) all adopt tube-fin heat exchangers, the finned tubes and the shell of each tube-fin heat exchanger are all made of stainless steel, in each tube-fin heat exchanger, refrigerant flows through a tube side, and VOCs (volatile organic chemicals) in refining enterprises flow through a shell side and flow in opposite directions;
adsorption system include admission valve (25), one-level adsorption tank (23), one-level discharge valve (21), second grade adsorption tank (19) and second grade discharge valve, admission valve (25) import links to each other through pipeline and precooler (8) second export, admission valve (25) export links to each other through pipeline and one-level adsorption tank (23) import, one-level adsorption tank (23) export links to each other through pipeline and discharge valve (21) import, the export of discharge valve (21) passes through the pipeline and links to each other with the import of second grade adsorption tank (19), the export of second grade adsorption tank (19) links to each other with tail gas discharge system through the pipeline of taking the second grade discharge valve.
2. The VOCs recovery processing device of claim 1, wherein: the collection system comprises a preceding-stage flame arrester (3) and an induced draft fan (7), wherein the inlet of the preceding-stage flame arrester (3) is connected with the VOCs inlet (4) of the refining and chemical enterprises through a pipeline, the inlet of the induced draft fan (7) is connected with the outlet of the preceding-stage flame arrester (3) through a pipeline, and the outlet of the induced draft fan (7) is connected with the first inlet of the precooler (8) through a pipeline; be provided with preceding stage sample branch line on the pipeline between refining enterprise's VOCs import (4) and preceding stage spark arrester (3), preceding stage sample branch line's middle section is provided with preceding stage sample valve (5), the outer tip of preceding stage sample branch line is preceding stage sample connection (6).
3. The VOCs recovery processing device of claim 2, wherein: desorption system including broken empty valve (22), one-level adsorption tank (23), one-level desorption valve (24), second grade adsorption tank (19), second grade desorption valve (20) and vacuum pump (26), one-level desorption valve (24) import links to each other through pipeline and one-level adsorption tank (23) import, one-level desorption valve (24) export links to each other through pipeline and vacuum pump (26) import, vacuum pump (26) export links to each other through pipeline and draught fan (7) import, one-level adsorption tank (23) export links to each other through pipeline and broken empty valve (22) import, second grade desorption valve (20) link to each other with the import of vacuum pump (26) through the pipeline with the import of second grade adsorption tank (19), second grade desorption valve (20) and second grade discharge valve be manual valve.
4. The VOCs recovery processing device of claim 3, wherein: the tail gas emission system comprises a rear-stage flame arrester (17) and an emission barrel (18), wherein the inlet of the rear-stage flame arrester (17) is connected with the outlet of a secondary emission valve through a pipeline, and the outlet of the flame arrester (17) is connected with the inlet of the emission barrel (18) through a pipeline; a rear-stage sampling branch pipeline is arranged on a pipeline between the flame arrester (17) and the second-stage discharge valve, a rear-stage sampling valve (15) is arranged in the middle section of the rear-stage sampling branch pipeline, and a rear-stage sampling port (16) is arranged at the outer end part of the rear-stage sampling branch pipeline.
5. The VOCs recovery processing device of claim 1, wherein: in the condensation recovery system, the precooler (8), the primary condenser (10), the secondary condenser (12) and the tertiary condenser (14) are all designed in an explosion-proof way; in the adsorption system, the first-stage adsorption tank (23) is composed of two adsorption tanks which are arranged in parallel and independently perform adsorption and desorption operations, and the second-stage adsorption tank (19) is composed of one adsorption tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920331309.7U CN210045028U (en) | 2019-03-15 | 2019-03-15 | VOCs recovery processing device of refining enterprise |
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