Oil and gas processing system and process

Abstract

The present invention relates to the technical field of industrial VOC treatment systems, and in particular to an oil and gas treatment system and process, which can treat oil and gas with relatively complex components, effectively reduce the oil content therein, and can meet oil and gas emission standards, improve the treatment effect of oil and gas, and improve practicality; it includes a low-temperature diesel cleaning unit, a deep condensation unit and an activated carbon fiber adsorption unit, the input end of the low-temperature diesel cleaning unit is provided with a first exhaust gas inlet, the input end of the low-temperature diesel cleaning unit is provided with a flame arrester and a first control valve, the output end of the low-temperature diesel cleaning unit is provided with a first output pipe, the output end of the first output pipe is connected with the deep condensation unit through a first connecting pipe, and a second exhaust gas inlet and an accident discharge pipe are provided on the first connecting pipe; the process includes the following steps: S1, low-temperature diesel cleaning oil and gas; S2, deep condensation treatment; S3, activated carbon fiber adsorption treatment; S4, activated carbon fiber regeneration treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial VOC treatment systems, and in particular to an oil and gas treatment system and process. Background Art

[0002] As we all know, a large amount of oil and gas will be generated during the production and transportation process of the refining industry, including breathing oil and gas in the tank area, oil and gas loaded on the platform, and oil and gas unloaded at the terminal, involving crude oil, gasoline, diesel, aviation kerosene, wax oil and asphalt, etc. The emission of these oil and gas is the focus of national supervision, and the emission standards of oil and gas are becoming more and more stringent. The existing treatment of oil and gas generally adopts condensation treatment, and the condensation treatment temperature is generally -75°C, and activated carbon adsorption technology is used. However, these technologies are generally only suitable for the treatment of oil and gas with simple components. However, when treating the crude oil, wax oil and other complex oil and gas produced in the existing refining industry, the treated gas is difficult to meet the standards, resulting in poor treatment effect and poor practicality. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the shortcomings of the prior art, an object of the present invention is to provide an oil and gas processing system that can process oil and gas with relatively complex components, effectively reduce the oil content therein, meet oil and gas emission standards, improve the processing effect of oil and gas, and improve practicality;

[0005] Another object of the present invention is to provide an oil and gas processing process for treating oil and gas with relatively complex components, effectively reducing the oil content therein, meeting oil and gas emission standards, improving the treatment effect of oil and gas, and improving practicality.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an oil and gas processing system, comprising a low-temperature diesel cleaning unit, a deep condensation unit and an activated carbon fiber adsorption unit, the input end of the low-temperature diesel cleaning unit is provided with a first exhaust gas inlet, and a flame arrester and a first control valve are provided at the input end of the low-temperature diesel cleaning unit, and the output end of the low-temperature diesel cleaning unit is provided with a first output pipe, and a first induced draft fan is provided on the first output pipe, the output end of the first output pipe is connected with the deep condensation unit through a first connecting pipe, and a second exhaust gas inlet and an accident discharge pipe are provided on the first connecting pipe, two groups of second control valves are provided on the first connecting pipe and the accident discharge pipe respectively, a second induced draft fan is connected on the first connecting pipe, the deep condensation unit is connected with the activated carbon fiber adsorption unit through the second connecting pipe, and a buffer tank and a third control valve are provided on the second connecting pipe, the output end of the activated carbon fiber adsorption unit is provided with an exhaust pipe, and the accident discharge pipe is connected with the exhaust pipe.

[0008] Specifically, the low-temperature diesel cleaning unit includes two groups of washing towers, wherein the two groups of washing towers are respectively provided with multiple groups of packing layers and two groups of mist catching nets, and two groups of storage tanks are respectively connected and arranged at the bottom of the two groups of washing towers, wherein the two groups of storage tanks are both provided with cooling pipelines, and the two groups of storage tanks are respectively connected through two groups of oil delivery pipes, wherein the input ends of the two groups of oil delivery pipes are respectively located in the two groups of storage tanks, and two groups of filter nets are respectively provided at the input ends of the two groups of oil delivery pipes, and two groups of oil delivery pumps are respectively provided on the two groups of oil delivery pipes, and multiple groups of manifolds are respectively connected and arranged on the two groups of oil delivery pipes, wherein the multiple groups of manifolds are partially fixed in the two groups of washing towers, and multiple groups of nozzles are respectively provided on the multiple groups of manifolds, and multiple groups of opening valves are respectively provided on the multiple groups of manifolds, and the output ends of the two groups of washing towers are both connected with the first output pipe, and the two groups of washing towers are connected through the circulation pipeline.

[0009] Specifically, the deep condensation unit includes a primary condensation system, a secondary condensation system and a tertiary condensation system, which are connected in sequence, and a heat exchange system is arranged between the secondary condensation system and the tertiary condensation system, and a temperature recovery 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 recovery system are connected through pipelines and connected to the outlet of the condensate recovery pipeline, and a temporary storage tank and a transmission pump are arranged on the condensate recovery pipeline.

[0010] Specifically, the activated carbon fiber adsorption unit includes three groups of activated carbon adsorption tanks, each of which is provided with activated carbon fiber fillers, the second connecting pipe is connected to the first input end of the three groups of activated carbon adsorption tanks through three groups of input pipes, the exhaust pipe is connected to the first output end of the three groups of activated carbon adsorption tanks through three groups of output pipes, and the second output end of the three groups of activated carbon adsorption tanks is connected to the second input end through a reflux pipe.

[0011] Specifically, it also includes a regeneration and recovery system, which is arranged on the activated carbon fiber adsorption unit, and the regeneration and recovery system includes a cooling system, a steam input pipeline, a steam condensate output pipeline, a condenser, a desorption fan and a light component external supply fan. The steam input pipeline is connected to three groups of activated carbon adsorption tanks, and the steam condensate output pipeline is connected to the steam input pipeline. The third output ends of the three groups of activated carbon adsorption tanks are all provided with outlet pipelines and are connected to the condenser. The first output end of the condenser is provided with a discharge pipeline connected to the light component external supply fan, and a return pipeline is provided on the discharge pipeline to connect to the steam input pipeline. The desorption fan is arranged on the return pipeline. The second output end of the condenser is provided with a stratification tank, and a recovery storage tank and a decontaminated water biochemical treatment system are provided at the output end of the stratification tank. The output end of the recovery storage tank is connected to the condensate recovery pipeline, and the cooling system is connected to the condenser.

[0012] Specifically, the regeneration and recovery system also includes a gas-liquid separator, a dry surface cooler, a dry fan and a heat exchanger. The fourth output ends of the three groups of activated carbon adsorption tanks are connected to a circulation pipeline and are connected to the gas-liquid separator. The output end of the gas-liquid separator is connected to the dry surface cooler, the dry surface cooler is connected to the heat exchanger, and a dry fan is provided between the dry surface cooler and the heat exchanger. The output end of the heat exchanger is connected to the air outlet pipe, the steam input pipe is connected to the heat exchanger, the dry surface cooler is connected to the cooling system, and the output ends of the dry surface cooler and the gas-liquid separator are both connected to the stratification tank.

[0013] Based on the oil and gas processing system, an oil and gas processing process is provided, which includes the following steps:

[0014] S1. Low-temperature diesel oil and gas cleaning: oil and gas are introduced into two sets of washing towers in the low-temperature diesel oil cleaning unit through the first tail gas inlet, the diesel in the two sets of storage tanks is cooled through two sets of cooling pipes, and the cooled diesel is lifted through two sets of oil delivery pipes under the action of two sets of oil delivery pumps, and after being divided by multiple sets of manifolds, it enters the two sets of washing towers and is sprayed out through multiple sets of nozzles. The diesel and oil and gas are in countercurrent contact, and the diesel absorbs organic matter in the oil and gas. The saturated diesel is absorbed and can be sent to the waste oil system for re-refining;

[0015] S2. Deep condensation treatment: The oil gas or light oil with simpler components washed by low-temperature diesel is introduced into the primary condensation system through the second induced draft fan, and flows along the primary condensation system, the secondary condensation system, the heat exchange system, the tertiary condensation system and the temperature recovery system to remove a large amount of water vapor and organic components in the oil gas. The heat exchange system allows the tertiary condensation exhaust to participate in the heat exchange of the secondary condensation exhaust, effectively reducing the temperature of the oil gas discharged through the secondary condensation system, and the temperature recovery system is used to recover the exhaust gas discharged from the tertiary condensation system to increase the temperature of the exhaust gas. The liquid produced by condensation is discharged through the condensation recovery pipeline;

[0016] S3, activated carbon fiber adsorption treatment: the exhaust gas after deep condensation treatment enters into three groups of activated carbon adsorption tanks through the second connecting pipe, and a small amount of pollutants entangled in the exhaust gas are adsorbed by the activated carbon fiber, and the adsorbed gas is discharged through the exhaust pipe after meeting the standards;

[0017] S4. Regeneration of activated carbon fiber: When the activated carbon fiber is saturated with adsorption, low-pressure steam is introduced to regenerate the activated carbon fiber, and the organic matter adsorbed thereon is desorbed and carried out with the steam into the condenser, where it is liquefied to form negative pressure to complete the desorption of the remaining organic matter, and then the activated carbon fiber is dried by a drying fan. The gas discharged from the three groups of activated carbon adsorption tanks is separated into gas and liquid by a gas-liquid separator, and then enters a surface cooling dryer for cooling. At the same time, part of the water vapor is removed, and after passing through a drying fan and heat exchanger, it refluxes through the third output end of the activated carbon adsorption tank to form a circulation, and the gas recovered by the condenser, the gas-liquid separator and the dry surface cooler is discharged through the condensate recovery pipeline.

[0018] Specifically, the cold source in the two sets of cooling pipes in the low-temperature diesel cleaning unit comes from the coldness provided by the deep condensing unit compressor; the temperature of the diesel is 7-15°C; the empty tower flow rate of the washing tower is set to 0.3-0.8m / s; the liquid-gas ratio of low-temperature diesel to oil and gas is ≥5.5L / m 3 ; The contact time between low-temperature diesel and oil gas is ≥6s.

[0019] Specifically, the condensation temperature of the first-stage condensation system is 0 to 2°C, the condensation temperature of the second-stage condensation system is -35°C, the condensation temperature of the third-stage condensation system is -110 to -130°C, and the return temperature of the return temperature system is 0 to 2°C.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides an oil and gas processing system and process, which has the following beneficial effects:

[0022] The oil and gas processing system of the present application can continuously process heavy oils such as crude oil gas, asphalt tail gas, wax oil tail gas, etc. through the low-temperature diesel cleaning unit, deep condensation unit and activated carbon fiber adsorption unit in sequence, and can also process light oils such as gasoline, diesel, aviation kerosene, naphtha, aluminum foil oil, etc. only through the deep condensation unit and activated carbon fiber adsorption unit. The treated gas can meet the requirements of local emission standards. The three units are connected in series to clean all the components in the oil and gas and achieve near-zero emissions.

[0023] The oil and gas treatment system of the present application is designed with a low-temperature diesel cleaning unit. Since most hydrocarbon substances and benzene molecules in the tail gas of crude oil, light oil, wax oil and asphalt are non-polar or weakly polar, diesel, as a non-polar organic solvent, can easily absorb organic matter in oil products and asphalt tail gas according to the principle of "like dissolves like", that is, the mutual solubility of organic matter. Under low temperature conditions, diesel absorbs steam and heat in the oil and gas, so that part of the high-boiling point organic matter in the oil and gas is directly condensed into liquid, and diesel is used for absorption, so the absorption effect is more obvious, and the diesel after absorption saturation can be sent to the waste oil system for re-refining, and there is no problem of secondary pollution.

[0024] The oil and gas processing system of the present application is designed with a deep condensation unit, which is divided into three levels of condensation devices with different temperatures and heat exchange energy-saving devices, which can deeply condense the oil and gas to a minimum of -110 to -130°C, and remove most of the oil and gas, reducing pollutant emissions, and being more energy-saving and environmentally friendly, including:

[0025] The first stage condensation temperature is 0-2°C (temperature adjustable). The first stage condensation mainly removes most of the water vapor to avoid ice formation in the subsequent condensation process, which may reduce the processing efficiency or damage the equipment.

[0026] The oil and gas after primary condensation and dehydration enters the secondary condensation, and the secondary condensation temperature is -35℃;

[0027] The three-stage condensation reduces the oil and gas temperature to -110~-130℃, at which time most of the components in the oil and gas change from gas to liquid and are separated from the oil and gas;

[0028] An intermediate heat exchanger is set between the third-stage condensation and the second-stage condensation, so that the exhaust gas of the third-stage condensation participates in the heat exchange of the exhaust gas of the second-stage condensation, thereby reducing the oil and gas temperature after the second-stage condensation, reducing the energy consumption of the third-stage refrigeration compressor unit, and saving energy;

[0029] At the same time, the tail gas of the third-stage condensation is reheated to increase the temperature of the oil and gas after condensation treatment and reduce the freezing and cracking of the pipeline;

[0030] Since the deep condensation unit itself is a purely physical process, the liquid condensed in each device is qualified oil and can be directly sent to the finished product tank;

[0031] The oil and gas treatment system of the present application is designed with an activated carbon fiber adsorption unit. After the oil and gas are washed by low-temperature diesel and deep condensed in the unit, they enter the activated carbon fiber adsorption unit to adsorb a small amount of residual pollutants. The gas after adsorption meets the emission standards. After the activated carbon fiber is saturated with adsorption, it is regenerated with steam.

[0032] When the activated carbon fiber adsorption unit is regenerated, the storage tank is recovered and a light component external delivery fan is designed. A very small amount of light components such as C2, C3, etc. are started according to the front-end pressure during regeneration. The light component external delivery fan is sent as raw material, and the steam regeneration liquid containing oil-containing heavy components is sealed and sent to the sewage treatment system for biochemical treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the present invention;

[0034] Figure 2 It is a structural schematic diagram of a low-temperature diesel cleaning unit;

[0035] Figure 3 is a schematic diagram of the structure of the deep condensation unit;

[0036] Figure 4 It is a schematic diagram of the structure of the activated carbon fiber adsorption unit and the regeneration and recovery system;

[0037] Markings in the attached drawings: 1, low-temperature diesel cleaning unit; 2, deep condensation unit; 3, activated carbon fiber adsorption unit; 4, first exhaust gas inlet; 5, flame arrester; 6, first control valve; 7, first output pipe; 8, first induced draft fan; 9, first connecting pipe; 10, second exhaust gas inlet; 11, accident discharge pipe; 12, second control valve; 13, second induced draft fan; 14, buffer tank; 15, third control valve; 16, exhaust pipe; 17, regeneration recovery system; 18, second connecting pipe;

[0038] Low-temperature diesel cleaning unit: 101, washing tower; 102, packing layer; 103, mist catcher; 104, storage tank; 105, cooling pipeline; 106, oil delivery pipe; 107, filter; 108, oil delivery pump; 109, diverter pipe; 110, nozzle; 111, opening valve; 112, circulation pipeline;

[0039] Deep condensation unit: 201, primary condensation system; 202, secondary condensation system; 203, tertiary condensation system; 204, heat exchange system; 205, temperature recovery system; 206, condensate recovery pipeline; 207, temporary storage tank; 208, transmission pump;

[0040] Activated carbon fiber adsorption unit: 301, activated carbon adsorption tank; 302, activated carbon fiber filler; 303, input pipe; 304, output pipe; 305, reflux pipe;

[0041] Regeneration and recovery system: 1701, cooling system; 1702, steam input pipeline; 1703, steam condensate output pipeline; 1704, condenser; 1705, desorption fan; 1706, light component external blower; 1707, air outlet pipeline; 1708, discharge pipeline; 1709, return pipeline; 1710, stratification tank; 1711, recovery storage tank; 1712, wastewater biochemical treatment system; 1713, gas-liquid separator; 1714, dry surface cooler; 1715, dry fan; 1716, heat exchanger; 1717, circulation pipeline. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-4 , an oil and gas processing system, comprising a low-temperature diesel cleaning unit 1, a deep condensation unit 2 and an activated carbon fiber adsorption unit 3, the low-temperature diesel cleaning unit 1 is provided with a first exhaust gas inlet 4 at the input end, and a flame arrester 5 and a first control valve 6 are provided at the input end of the low-temperature diesel cleaning unit 1, and the low-temperature diesel cleaning unit 1 is provided with a first output pipe 7 at the output end, and a first induced draft fan 8 is provided on the first output pipe 7, the output end of the first output pipe 7 is connected with the deep condensation unit 2 through a first connecting pipe 9, and a second exhaust gas inlet 10 and an accident discharge pipe 11 are provided on the first connecting pipe 9, two groups of second control valves 12 are provided on the first connecting pipe 9 and the accident discharge pipe 11, respectively, a second induced draft fan 13 is connected to the first connecting pipe 9, the deep condensation unit 2 is connected with the activated carbon fiber adsorption unit 3 through a second connecting pipe 18, and a buffer tank 14 and a third control valve 15 are provided on the second connecting pipe 18, an exhaust pipe 16 is provided at the output end of the activated carbon fiber adsorption unit 3, and the accident discharge pipe 11 is connected to the exhaust pipe 16.

[0044] The low-temperature diesel cleaning unit 1 comprises two groups of washing towers 101, wherein the two groups of washing towers 101 are respectively provided with multiple groups of packing layers 102 and two groups of mist catching nets 103, and two groups of storage tanks 104 are respectively connected and arranged at the bottom of the two groups of washing towers 101, wherein the two groups of storage tanks 104 are both provided with cooling pipelines 105, and the two groups of storage tanks 104 are respectively connected through two groups of oil delivery pipes 106, wherein the input ends of the two groups of oil delivery pipes 106 are respectively located in the two groups of storage tanks 104, and the two groups of oil delivery pipes 106 are respectively provided with cooling pipelines 105. Two groups of filter screens 107, two groups of oil delivery pipes 106 are respectively provided with two groups of oil delivery pumps 108, the two groups of oil delivery pipes 106 are respectively connected with multiple groups of manifolds 109, the multiple groups of manifolds 109 are partially fixed in the two groups of washing towers 101, and multiple groups of nozzles 110 are respectively provided on the multiple groups of manifolds 109, and multiple groups of opening valves 111 are respectively provided on the multiple groups of manifolds 109, the output ends of the two groups of washing towers 101 are connected with the first output pipe 7, and the two groups of washing towers 101 are connected through the circulation pipeline.

[0045] The deep condensation unit 2 includes a primary condensation system 201, a secondary condensation system 202 and a tertiary condensation system 203, which are connected in sequence, and a heat exchange system 204 is arranged between the secondary condensation system 202 and the tertiary condensation system 203, and a temperature recovery system 205 is arranged at the output end of the tertiary condensation system 203. The output ends of the primary condensation system 201, the secondary condensation system 202, the tertiary condensation system 203, the heat exchange system 204 and the temperature recovery system 205 are connected through pipelines and are connected to the outlet of the condensate recovery pipeline 206, and a temporary storage tank 207 and a transmission pump 208 are arranged on the condensate recovery pipeline 206.

[0046] The activated carbon fiber adsorption unit 3 includes three groups of activated carbon adsorption tanks 301, each of which is provided with activated carbon fiber fillers 302, the second connecting pipe 18 is connected to 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 connected to 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 connected to the second input end through the reflux pipe 305.

[0047] The regeneration and recovery system 17 is also included. The regeneration and recovery system 17 is arranged on the activated carbon fiber adsorption unit 3, and the regeneration and recovery system 17 includes 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. The steam input pipeline 1702 is connected to the three groups of activated carbon adsorption tanks 301, and the steam condensate output pipeline 1703 is connected to the steam input pipeline 1702. The three groups of activated carbon adsorption tanks The third output end of the tank 301 is provided with an outlet pipe 1707 and is connected to the condenser 1704. The first output end of the condenser 1704 is provided with a discharge pipe 1708 and is connected to the light component external blower 1706. The discharge pipe 1708 is provided with a return pipe 1709 and is connected to the steam input pipe 1702. The desorption blower 1705 is provided on the return pipe 1709. The second output end of the condenser 1704 is provided with a stratification tank 1710, and a recovery blower 1706 is provided at the output end of the stratification tank 1710. The storage tank 1711 and the wastewater biochemical treatment system 1712, the output end of the recovery storage tank 1711 is connected to the condensate recovery pipeline 206, the cooling system 1701 is connected to the condenser 1704, the regeneration recovery system 17 also includes a gas-liquid separator 1713, a dry surface cooler 1714, a dry fan 1715 and a heat exchanger 1716, the fourth output end of the three groups of activated carbon adsorption tanks 301 is connected to the circulation pipeline 1717 and is connected to the gas-liquid separator 1713, and the gas-liquid separator 1713 output The end is connected to the dry surface cooler 1714, the dry surface cooler 1714 is connected to the heat exchanger 1716, and a dry fan 1715 is arranged between the dry surface cooler 1714 and the heat exchanger 1716, the output end of the heat exchanger 1716 is connected to the air outlet pipe 1707, the steam input pipe 1702 is connected to the heat exchanger 1716, the dry surface cooler 1714 is connected to the cooling system 1701, and the output ends of the dry surface cooler 1714 and the gas-liquid separator 1713 are both connected to the stratification tank 1710.

[0048] Based on the oil and gas processing system, an oil and gas processing process is provided, which includes the following steps:

[0049] S1. Low-temperature diesel oil and gas cleaning: oil and gas are introduced into two sets of washing towers in the low-temperature diesel oil cleaning unit through the first tail gas inlet, the diesel in the two sets of storage tanks is cooled through two sets of cooling pipes, and the cooled diesel is lifted through two sets of oil delivery pipes under the action of two sets of oil delivery pumps, and after being divided by multiple sets of manifolds, it enters the two sets of washing towers and is sprayed out through multiple sets of nozzles. The diesel and oil and gas are in countercurrent contact, and the diesel absorbs organic matter in the oil and gas. The saturated diesel is absorbed and can be sent to the waste oil system for re-refining;

[0050] S2. Deep condensation treatment: The oil gas or light oil with simpler composition washed by low-temperature diesel is introduced into the primary condensation system through the second induced draft fan, and flows along the primary condensation system, the secondary condensation system, the heat exchange system, the tertiary condensation system and the temperature recovery system to remove a large amount of water vapor and organic components in the oil gas. The heat exchange system can make the tertiary condensation exhaust gas participate in the heat exchange of the secondary condensation exhaust gas, effectively reduce the temperature of the oil gas discharged through the secondary condensation system, and the exhaust gas discharged from the tertiary condensation system is treated with temperature recovery through the temperature recovery system to increase the temperature of the exhaust gas. The liquid produced by condensation is discharged through the condensation recovery pipeline. The condensation temperature of the primary condensation system is 0-2°C, the condensation temperature of the secondary condensation system is -35°C, the condensation temperature of the tertiary condensation system is -110--130°C, and the temperature recovery temperature of the temperature recovery system is 0-2°C.

[0051] S3, activated carbon fiber adsorption treatment: the exhaust gas after deep condensation treatment enters into three groups of activated carbon adsorption tanks through the second connecting pipe, and a small amount of pollutants entangled in the exhaust gas are adsorbed by the activated carbon fiber, and the adsorbed gas is discharged through the exhaust pipe after meeting the standards;

[0052] S4, activated carbon fiber regeneration treatment: when the activated carbon fiber is saturated with adsorption, low-pressure steam is introduced to regenerate the activated carbon fiber, and the organic matter adsorbed thereon is desorbed and taken out with the steam to the condenser, where it is liquefied to form negative pressure to complete the desorption of the remaining organic matter, and then the activated carbon fiber is dried by a drying fan. The gas discharged from the three groups of activated carbon adsorption tanks is separated into gas and liquid by a gas-liquid separator, and then enters a surface cooling dryer for cooling, while removing part of the water vapor. After passing through a drying fan and heat exchanged in a heat exchanger, it refluxes through the third output end of the activated carbon adsorption tank to form a cycle. The gas recovered by the condenser, gas-liquid separator and dry surface cooler is discharged through a condensate recovery pipeline.

[0053] The oil and gas processing system of the present application can continuously process heavy oils such as crude oil gas, asphalt tail gas, wax oil tail gas, etc. through the low-temperature diesel cleaning unit, deep condensation unit and activated carbon fiber adsorption unit in sequence, and can also process light oils such as gasoline, diesel, aviation kerosene, naphtha, aluminum foil oil, etc. only through the deep condensation unit and activated carbon fiber adsorption unit. The treated gas can meet the requirements of local emission standards. The three units are connected in series to clean all the components in the oil and gas and achieve near-zero emissions.

[0054] The oil and gas treatment system of the present application is designed with a low-temperature diesel cleaning unit. Since most hydrocarbon substances and benzene molecules in the tail gas of crude oil, light oil, wax oil and asphalt are non-polar or weakly polar, diesel, as a non-polar organic solvent, can easily absorb organic matter in oil products and asphalt tail gas according to the principle of "like dissolves like", that is, the mutual solubility of organic matter. Under low temperature conditions, diesel absorbs steam and heat in the oil and gas, so that part of the high-boiling point organic matter in the oil and gas is directly condensed into liquid, and diesel is used for absorption, so the absorption effect is more obvious, and the diesel after absorption saturation can be sent to the waste oil system for re-refining, and there is no problem of secondary pollution.

[0055] The oil and gas processing system of the present application is designed with a deep condensation unit, which is divided into three levels of condensation devices with different temperatures and heat exchange energy-saving devices, which can deeply condense the oil and gas to a minimum of -110 to -130°C, and remove most of the oil and gas, reducing pollutant emissions, and being more energy-saving and environmentally friendly, including:

[0056] The first stage condensation temperature is 0-2°C (temperature adjustable). The first stage condensation mainly removes most of the water vapor to avoid ice formation in the subsequent condensation process, which may reduce the processing efficiency or damage the equipment.

[0057] The oil and gas after primary condensation and dehydration enters the secondary condensation, and the secondary condensation temperature is -35℃;

[0058] The three-stage condensation reduces the oil and gas temperature to -110~-130℃, at which time most of the components in the oil and gas change from gas to liquid and are separated from the oil and gas;

[0059] An intermediate heat exchanger is set between the third-stage condensation and the second-stage condensation, so that the exhaust gas of the third-stage condensation participates in the heat exchange of the exhaust gas of the second-stage condensation, thereby reducing the oil and gas temperature after the second-stage condensation, reducing the energy consumption of the third-stage refrigeration compressor unit, and saving energy;

[0060] At the same time, the tail gas of the third-stage condensation is reheated to increase the temperature of the oil and gas after condensation treatment and reduce the freezing and cracking of the pipeline;

[0061] Since the deep condensation unit itself is a purely physical process, the liquid condensed in each device is qualified oil and can be directly sent to the finished product tank;

[0062] The oil and gas treatment system and process of the present application is designed with an activated carbon fiber adsorption unit. After the oil and gas are washed by low-temperature diesel and deep condensed in the unit, they enter the activated carbon fiber adsorption unit to adsorb a small amount of residual pollutants. The gas after adsorption meets the emission standards. After the activated carbon fiber is saturated with adsorption, it is regenerated with steam.

[0063] When the activated carbon fiber adsorption unit is regenerated, the storage tank is recovered and a light component external delivery fan is designed. A very small amount of light components such as C2, C3, etc. are started according to the front-end pressure during regeneration. The light component external delivery fan is sent as raw material, and the steam regeneration liquid containing oil-containing heavy components is sealed and sent to the sewage treatment system for biochemical treatment.

[0064] After condensation, the oil and gas enter the activated carbon fiber adsorption unit. Under the action of van der Waals force, the residual organic pollutants in the oil and gas are adsorbed into the micropores of the activated carbon fiber. The adsorption unit adopts a multi-stage adsorption process, alternately used and regenerated, and automatically switched through program control to ensure the continuous operation and continuous processing capacity of the entire adsorption system, and to ensure that the processing capacity of the equipment is not affected during equipment regeneration. The final export oil and gas meets the emission standards. When the activated carbon fiber adsorption device reaches the set regeneration time, low-pressure steam is introduced to regenerate the activated carbon fiber to desorb the organic matter adsorbed on the activated carbon fiber. At the same time, steam purges the water vapor and organic matter. The mixed steam of the engine steam is blown out and sent to the recovery system. Then the desorption fan is turned on to blow the water vapor in the tank into the condenser. The water vapor is liquefied, so that negative pressure is formed in the activated carbon fiber adsorption tank. The remaining adsorbent is removed from the fiber micropores under the action of negative pressure, completing the vacuum regeneration process of the activated carbon fiber. Finally, the drying fan is turned on to dry the activated carbon fiber adsorption device. The outlet gas of the drying fan is heated by the heater and then passed into the equipment. The exhaust gas of the equipment enters the gas-liquid separator for gas-liquid separation. The remaining gas enters the dry surface cooler to cool the gas. While cooling, it can also remove the remaining part of the water vapor in the gas, and then returns to the drying fan for recycling. After drying, the water contained in the activated carbon fiber is completely removed, the entire regeneration process is completed, and the equipment is put back into use. The mixed gas containing water vapor and organic vapor generated during the regeneration of the activated carbon fiber is condensed by the condensation heat exchanger, and the mixed condensate and the condensate flowing out of the bottom of the adsorber flow into a specially designed separation device. After oil-water separation, the wastewater after stratification is discharged into the sewage pipe; the gasoline condensate enters the metering tank by gravity, and the gasoline condensate collected by the condensation unit is fully recycled.

[0065] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0066] The electrical components appearing in this article are all connected to an external main controller and 380V industrial power, and the main controller can be a conventional known device for control such as a computer.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil and gas processing system, characterized in that: The invention comprises a low-temperature diesel cleaning unit (1), a deep condensation unit (2) and an activated carbon fiber adsorption unit (3); the input end of the low-temperature diesel cleaning unit (1) is provided with a first exhaust gas inlet (4); the input end of the low-temperature diesel cleaning unit (1) is provided with a flame arrester (5) and a first control valve (6); the output end of the low-temperature diesel cleaning unit (1) is provided with a first output pipe (7); a first induced draft fan (8) is provided on the first output pipe (7); the output end of the first output pipe (7) is connected to the deep condensation unit (2) via a first connecting pipe (9); a second exhaust gas inlet (4) is provided on the first connecting pipe (9); An exhaust gas inlet (10) and an emergency discharge pipe (11), two sets of second control valves (12) are respectively provided on the first connecting pipe (9) and the emergency discharge pipe (11), a second induced draft fan (13) is provided in communication with the first connecting pipe (9), the deep condensation unit (2) is connected to the activated carbon fiber adsorption unit (3) via the second connecting pipe (18), a buffer tank (14) and a third control valve (15) are provided on the second connecting pipe (18), an exhaust pipe (16) is provided at the output end of the activated carbon fiber adsorption unit (3), and the emergency discharge pipe (11) is connected to the exhaust pipe (16); The low-temperature diesel cleaning unit (1) comprises two groups of washing towers (101), wherein the two groups of washing towers (101) are respectively provided with a plurality of packing layers (102) and two groups of mist catching nets (103), and two groups of storage tanks (104) are respectively connected and arranged at the bottom of the two groups of washing towers (101), wherein the two groups of storage tanks (104) are both provided with cooling pipelines (105), and the two groups of storage tanks (104) are respectively connected via two groups of oil delivery pipes (106), wherein the input ends of the two groups of oil delivery pipes (106) are respectively located in the two groups of storage tanks (104), and two oil delivery pipes (106) are respectively provided at the input ends of the two groups of oil delivery pipes (106). A filter screen (107) is provided on each of the two oil delivery pipes (106); two oil delivery pumps (108) are provided on each of the two oil delivery pipes (106); multiple flow pipes (109) are provided on each of the two oil delivery pipes (106); the multiple flow pipes (109) are partially fixed in the two washing towers (101); multiple nozzles (110) are provided on each of the multiple flow pipes (109); multiple opening valves (111) are provided on each of the multiple flow pipes (109); the output ends of the two washing towers (101) are both in communication with the first output pipe (7); and the two washing towers (101) are in communication with each other through a circulation pipeline; The deep condensation unit (2) comprises a primary condensation system (201), a secondary condensation system (202) and a tertiary condensation system (203); the primary condensation system (201), the secondary condensation system (202) and the tertiary condensation system (203) are connected in sequence, a heat exchange system (204) is provided between the secondary condensation system (202) and the tertiary condensation system (203), and a temperature recovery system (205) is provided at the output end of the tertiary condensation system (203); the output ends of the primary condensation system (201), the secondary condensation system (202), the tertiary condensation system (203), the heat exchange system (204) and the temperature recovery system (205) are connected via pipelines and are connected to an outlet of a condensate recovery pipeline (206); and a temporary storage tank (207) and a transmission pump (208) are provided on the condensate recovery pipeline (206); The activated carbon fiber adsorption unit (3) comprises three groups of activated carbon adsorption tanks (301), each of the three groups of activated carbon adsorption tanks (301) being provided with activated carbon fiber fillers (302), the second connecting pipe (18) being connected to the first input ends of the three groups of activated carbon adsorption tanks (301) through three groups of input pipes (303), the exhaust pipe (16) being connected to the first output ends of the three groups of activated carbon adsorption tanks (301) through three groups of output pipes (304), and the second output ends of the three groups of activated carbon adsorption tanks (301) being connected to the second input ends through a return pipe (305); The invention also includes a regeneration and recovery system (17), wherein the regeneration and recovery system (17) is arranged on the activated carbon fiber adsorption unit (3), and the regeneration and recovery system (17) includes 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 supply fan (1706), wherein the steam input pipeline (1702) is connected to three groups of activated carbon adsorption tanks (301), the steam condensate output pipeline (1703) is connected to the steam input pipeline (1702), and the third output ends of the three groups of activated carbon adsorption tanks (301) are all provided with an air outlet pipeline (1707) and are connected to the condenser (1704). The first output end of the condenser (1704) is provided with a discharge pipe (1708) connected to the light component external supply fan (1706); the discharge pipe (1708) is provided with a return pipe (1709) connected to the steam input pipe (1702); the desorption fan (1705) is arranged on the return pipe (1709); the second output end of the condenser (1704) is provided with a stratification tank (1710); and the output end of the stratification tank (1710) is connected to a recovery tank (1711) and a decontaminated water biochemical treatment system (1712); the output end of the recovery tank (1711) is connected to the condensate recovery pipeline (206); and the cooling system (1701) is connected to the condenser (1704).

2. The oil and gas processing system according to claim 1, characterized in that: The regeneration and recovery system (17) further comprises a gas-liquid separator (1713), a dry surface cooler (1714), a dry fan (1715) and a heat exchanger (1716); the fourth output ends of the three groups of activated carbon adsorption tanks (301) are connected to a circulation pipeline (1717) and are in communication with the gas-liquid separator (1713); the output end of the gas-liquid separator (1713) is in communication with the dry surface cooler (1714); the dry surface cooler (1714) is in communication with the heat exchanger (1716); The dry surface cooler (1714) and the heat exchanger (1716) are connected, and a dry fan (1715) is arranged between the dry surface cooler (1714) and the heat exchanger (1716); the output end of the heat exchanger (1716) is connected to the air outlet pipe (1707); the steam input pipe (1702) is connected to the heat exchanger (1716); the dry surface cooler (1714) is connected to the cooling system (1701); and the output ends of the dry surface cooler (1714) and the gas-liquid separator (1713) are both connected to the stratification tank (1710).

3. An oil and gas processing process, based on the oil and gas processing system according to any one of claims 1 to 2, comprising the following steps: S1. Low-temperature diesel oil and gas cleaning: oil and gas are introduced into two sets of washing towers in the low-temperature diesel oil cleaning unit through the first tail gas inlet, the diesel in the two sets of storage tanks is cooled through two sets of cooling pipes, and the cooled diesel is lifted through two sets of oil delivery pipes under the action of two sets of oil delivery pumps, and after being divided by multiple sets of manifolds, it enters the two sets of washing towers and is sprayed out through multiple sets of nozzles. The diesel and oil and gas are in countercurrent contact, and the diesel absorbs organic matter in the oil and gas. The saturated diesel is absorbed and can be sent to the waste oil system for re-refining; S2. Deep condensation treatment: The oil gas or light oil with simpler components washed by low-temperature diesel is introduced into the primary condensation system through the second induced draft fan, and flows along the primary condensation system, the secondary condensation system, the heat exchange system, the tertiary condensation system and the temperature recovery system to remove a large amount of water vapor and organic components in the oil gas. The heat exchange system allows the tertiary condensation exhaust to participate in the heat exchange of the secondary condensation exhaust, effectively reducing the temperature of the oil gas discharged through the secondary condensation system, and the temperature recovery system is used to recover the exhaust gas discharged from the tertiary condensation system to increase the temperature of the exhaust gas. The liquid produced by condensation is discharged through the condensation recovery pipeline; S3, activated carbon fiber adsorption treatment: the exhaust gas after deep condensation treatment enters into three groups of activated carbon adsorption tanks through the second connecting pipe, and a small amount of pollutants entangled in the exhaust gas are adsorbed by the activated carbon fiber, and the adsorbed gas is discharged through the exhaust pipe after meeting the standards; S4. Regeneration of activated carbon fiber: When the activated carbon fiber is saturated with adsorption, low-pressure steam is introduced to regenerate the activated carbon fiber, and the organic matter adsorbed thereon is desorbed and carried out with the steam into the condenser, where it is liquefied to form negative pressure to complete the desorption of the remaining organic matter, and then the activated carbon fiber is dried by a drying fan. The gas discharged from the three groups of activated carbon adsorption tanks is separated into gas and liquid by a gas-liquid separator, and then enters a surface cooling dryer for cooling. At the same time, part of the water vapor is removed, and after passing through a drying fan and heat exchanger, it refluxes through the third output end of the activated carbon adsorption tank to form a circulation, and the gas recovered by the condenser, the gas-liquid separator and the dry surface cooler is discharged through the condensate recovery pipeline.

4. The oil and gas processing process according to claim 3, characterized in that: The cold source in the two cooling pipes of the low-temperature diesel cleaning unit comes from the coldness provided by the deep condensing unit compressor; the temperature of the diesel is 7-15°C; the empty tower flow rate of the washing tower is set at 0.3-0.8m / s; the liquid-gas ratio of the low-temperature diesel to the oil gas is ≥5.5L / m 3 ; The contact time between low-temperature diesel and oil gas is ≥6s.

5. The oil and gas processing process according to claim 3, characterized in that: The condensation temperature of the primary condensation system is 0~2°C, the condensation temperature of the secondary condensation system is -35°C, the condensation temperature of the tertiary condensation system is -110~-130°C, and the return temperature of the return temperature system is 0~2°C.

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