Oil gas recovery device and recovery method for cooling and saving energy by using excess pressure
阅读说明：本技术 一种利用余压冷却节能的油气回收装置及回收方法 (Oil gas recovery device and recovery method for cooling and saving energy by using excess pressure ) 是由 王加权 于 2020-07-30 设计创作，主要内容包括：一种利用余压冷却节能的油气回收装置,包括换热器、脱水机构、膨胀机、气液分离器、吸附机构和用于存储回收的液化油气的储油罐,换热器的热进口端外接废气输入管道和脱附管道,换热器的热出口端与脱水机构的进口端连通,脱水机构的出口端与膨胀机的进口端连通,膨胀机的出口端与气液分离器的进口端连通,气液分离器的气相出口端与换热器的冷进口端连通,气液分离器的液相出口端与储油罐连通,换热器的冷出口端与吸附机构的输入端连通,吸附机构的吸附端通过真空泵与换热器的冷进口端连通,吸附机构的出口端外接排气烟囱。该装置能够利用中高压废气余压转化的动能和冷能进行油气回收,可大幅降低装置运行能耗,节约设备投资,降低废气排放浓度。(The utility model provides an utilize energy-conserving vapor recovery unit of residual pressure cooling, including the heat exchanger, dehydration mechanism, the expander, gas-liquid separator, adsorption mechanism and the oil storage tank that is used for saving the liquefied oil gas of retrieving, external waste gas input pipeline of the hot entrance point of heat exchanger and desorption pipeline, the hot exit end of heat exchanger and dehydration mechanism's entrance point intercommunication, dehydration mechanism's exit end and expander's entrance point intercommunication, the exit end of expander and gas-liquid separator's entrance point intercommunication, gas-liquid separator's gaseous phase exit end and the cold entrance point intercommunication of heat exchanger, gas-liquid separator's liquid phase exit end and oil storage tank intercommunication, the cold exit end of heat exchanger and adsorption mechanism's input intercommunication, adsorption mechanism's adsorption end passes through the cold entrance point intercommunication of vacuum pump with the heat exchanger, adsorption. The device can utilize the kinetic energy and the cold energy of medium and high pressure waste gas excess pressure conversion to carry out vapor recovery, can reduce device operation energy consumption by a wide margin, practices thrift equipment investment, reduces exhaust emission concentration.)
1. The utility model provides an utilize energy-conserving vapor recovery system device of excess pressure cooling which characterized in that: the device includes the heat exchanger, dehydration mechanism, the expander, gas-liquid separator, the oil storage tank of adsorption mechanism and the liquefied oil gas that is used for saving the recovery, external waste gas input pipeline of the hot entrance point of heat exchanger and desorption pipeline, the hot exit end of heat exchanger and dehydration mechanism's entrance point intercommunication, dehydration mechanism's exit end and expander's entrance point intercommunication, the exit end of expander and gas-liquid separator's entrance point intercommunication, gas-liquid separator's gaseous phase exit end and the cold entrance point intercommunication of heat exchanger, gas-liquid separator's liquid phase exit end and oil storage tank intercommunication, the cold exit end of heat exchanger and adsorption mechanism's input intercommunication, adsorption mechanism's adsorption end intercommunication has the vacuum pump that is used for adsorption mechanism vacuum desorption regeneration, the desorption end and the desorption pipeline intercommunication of vacuum pump, adsorption mechanism's exit end connects the exhaust.
2. The oil-gas recovery device using residual pressure cooling for energy saving according to claim 1, characterized in that: an oil discharge pipeline is communicated with the oil storage tank, and an oil discharge control valve is installed on the oil discharge pipeline.
3. The oil-gas recovery device using residual pressure cooling for energy saving according to claim 1, characterized in that: the dehydration mechanism comprises two dehydration pipelines which are connected in parallel, each dehydration pipeline is provided with a regeneration adsorption type dryer and dehydration control valves which are arranged on two sides of the regeneration adsorption type dryer, and the regeneration adsorption type dryer adopts a molecular sieve as a drying agent.
4. The oil-gas recovery device using residual pressure cooling for energy saving according to claim 3, characterized in that: the dehydration pipeline is also communicated with a heating pipeline, and a heater is arranged on the heating pipeline.
5. The oil-gas recovery device using residual pressure cooling for energy saving according to claim 1, characterized in that: the expansion machine is connected with the vacuum pump shaft.
6. The oil-gas recovery device using residual pressure cooling for energy saving according to claim 1, characterized in that: an oil outlet pipeline is communicated with the oil storage tank, and an oil outlet pump is installed on the oil outlet pipeline.
7. The oil-gas recovery device using residual pressure cooling for energy saving according to claim 1, characterized in that: the adsorption mechanism comprises two adsorption pipelines which are arranged in parallel, and the adsorption pipelines are communicated with an active carbon adsorption tank and adsorption control valves which are arranged on two sides of the active carbon adsorption tank.
8. An oil gas recovery method using residual pressure for cooling and energy saving is characterized in that: the method uses the oil gas recovery device which utilizes residual pressure cooling and saves energy as claimed in any one of claims 1 to 7, and comprises the following steps:
(1) waste gas enters a heat exchanger through a waste gas input pipeline to exchange heat and cool, and then is sent to a dehydration mechanism to be dehydrated;
(2) sending the dehydrated waste gas into an expansion machine for decompression and cooling, and then sending the waste gas into a gas-liquid separator for gas-liquid separation to obtain liquid hydrocarbon and lean oil gas;
(3) liquid hydrocarbon is sent into an oil storage tank for recovery, lean oil gas is sent into a heat exchanger for heat exchange with newly input waste gas, and then is sent into an adsorption mechanism for adsorption treatment;
(4) the adsorbed lean oil gas is sent into an exhaust pipeline to be discharged outwards, meanwhile, a vacuum pump carries out vacuum desorption on an adsorption mechanism, and the lean oil gas adsorbed by the adsorption mechanism and newly input waste gas are sent back into a heat exchanger to be treated again;
(5) the oil gas in the waste gas is recycled in such a way.
Technical Field
The invention relates to the technical field of oil gas recovery, in particular to an energy-saving oil gas recovery device utilizing residual pressure cooling, and further relates to a recovery method of the energy-saving oil gas recovery device utilizing residual pressure cooling.
Background
The oil gas recovery treatment method mainly comprises an adsorption method, an absorption method, a condensation method, a membrane treatment and the like; the methods have the defects of low oil gas recovery efficiency, high oil gas emission concentration, high energy consumption, short service life, high investment cost, poor safety performance and the like.
At present, the oil gas recovery adopts the method of condensation and adsorption integration, firstly, the oil gas is condensed to a certain degree, most of hydrocarbon in the oil gas is liquefied, and then, activated carbon or resin is used for deep adsorption, the oil gas recovery efficiency of the condensation and adsorption integration process is high, and the standard emission of waste gas can be realized.
However, the currently adopted condensation and adsorption integrated method basically adopts a compressor for refrigeration, so that the energy consumption is high, and the refrigerant also has environmental and safety problems generally; for medium and high pressure oil gas recovery, two methods of reducing pressure by a pressure regulating valve and improving the pressure grade of equipment are mainly adopted, so that the pressure energy of the oil gas is wasted, the equipment cost is increased, and the medium and high pressure oil gas has leakage hidden danger.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides an oil gas recovery device which can utilize residual pressure cooling to recover oil gas, has low energy consumption in the oil gas recovery process, and solves the problem that the pressure waste generated in the oil gas recovery process can increase the recovery equipment cost.
The invention also provides a recovery method of the oil gas recovery device, which utilizes the residual pressure to cool and save energy.
The technical problem to be solved by the present invention is achieved by the following technical means. The invention relates to an oil gas recovery device using residual pressure for cooling and energy saving, which comprises a heat exchanger, a dehydration mechanism and an expander, the gas-liquid separator, the oil storage tank of adsorption mechanism and liquefied oil gas that is used for the storage to retrieve, external waste gas input pipeline of the hot entrance point of heat exchanger and desorption pipeline, the hot exit end of heat exchanger and the entrance point intercommunication of dehydration mechanism, the exit end of dehydration mechanism and the entrance point intercommunication of expander, the exit end of expander and gas-liquid separator's entrance point intercommunication, gas-liquid separator's gaseous phase exit end and the cold entrance point intercommunication of heat exchanger, gas-liquid separator's liquid phase exit end and oil storage tank intercommunication, the cold exit end of heat exchanger and adsorption mechanism's input intercommunication, adsorption mechanism's adsorption end intercommunication has the vacuum pump that is used for adsorption mechanism vacuum desorption regeneration, the desorption end and the desorption pipeline intercommunication of vacuum pump, adsorption mechanism's exit end connects the exhaust chimney.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the oil gas recovery device which utilizes residual pressure for cooling and energy saving, an oil discharge pipeline is also communicated with a hot cavity of the heat exchanger and is communicated with an oil storage tank, and an oil discharge control valve is arranged on the oil discharge pipeline.
The technical problem to be solved by the present invention can be further solved by the following technical scheme that, for the oil gas recovery device using residual pressure for cooling and energy saving, the dehydration mechanism comprises two dehydration pipelines which are arranged in parallel, each dehydration pipeline is provided with a regeneration adsorption type dryer and dehydration control valves arranged on two sides of the regeneration adsorption type dryer, and the regeneration adsorption type dryer adopts a molecular sieve as a drying agent.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the oil gas recovery device which utilizes residual pressure for cooling and energy saving, a heating pipeline is also communicated with the dehydration pipeline, and a heater is arranged on the heating pipeline.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the oil gas recovery device which utilizes residual pressure for cooling and energy saving, the expansion machine is connected with a vacuum pump shaft.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the oil gas recovery device which utilizes residual pressure for cooling and energy saving, an oil outlet pipeline is communicated with an oil storage tank, and an oil outlet pump is arranged on the oil outlet pipeline.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the oil gas recovery device utilizing residual pressure for cooling and energy saving, the adsorption mechanism comprises two adsorption pipelines which are arranged in parallel, and an activated carbon adsorption tank and adsorption control valves which are arranged on two sides of the activated carbon adsorption tank are communicated on the adsorption pipelines.
The technical problem to be solved by the invention can be further realized by the following technical scheme, and for the oil gas recovery device utilizing residual pressure for cooling and energy saving, the oil gas recovery method utilizing residual pressure for cooling and energy saving comprises the following steps:
(1) waste gas enters a heat exchanger through a waste gas input pipeline to exchange heat and cool, and then is sent to a dehydration mechanism to be dehydrated;
(2) sending the dehydrated waste gas into an expansion machine for decompression and cooling, and then sending the waste gas into a gas-liquid separator for gas-liquid separation to obtain liquid hydrocarbon and lean oil gas;
(3) liquid hydrocarbon is sent into an oil storage tank for recovery, lean oil gas is sent into a heat exchanger for heat exchange with newly input waste gas, and then is sent into an adsorption mechanism for adsorption treatment;
(4) the adsorbed lean oil gas is sent into an exhaust pipeline to be discharged outwards, meanwhile, a vacuum pump carries out vacuum desorption on an adsorption mechanism, and the lean oil gas adsorbed by the adsorption mechanism and newly input waste gas are sent back into a heat exchanger to be treated again;
(5) the oil gas in the waste gas is recycled in such a way.
Compared with the prior art, the invention has the following beneficial effects:
1. the cold energy after the oil gas is depressurized is fully utilized and used for condensing and recovering the oil gas, and the expansion machine is connected with the vacuum pump, so that the energy consumption required by oil gas recovery device equipment is reduced, and the problem of equipment cost during oil gas recovery is solved;
2. the automatic control degree is high, the reliability is high, the operation is simple, and the maintenance is convenient;
3. the expansion machine and the vacuum pump are mainly used for cold pressing, and a refrigeration compressor is not used, so that the energy consumption of equipment operation is greatly reduced;
4. the oil gas is firstly recovered by cooling the heat exchanger, secondarily recovered by cooling the oil gas by the expansion machine, and thirdly recovered by active carbon adsorption, so that the recovery rate of the oil gas is improved, the economic benefit of recovery equipment is enhanced, and the recovered liquid oil is stored in the oil storage tank, is visual and can be directly recycled;
5. the recovered oil gas is in the low temperature state, and the oil gas of low temperature state is difficult to burn, and the expander can be interlocked through the quick action emergency valve at the during operation, has guaranteed the security when oil gas retrieves.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an energy-saving oil gas recovery device using residual pressure cooling comprises a heat exchanger 2, a
An oil discharge pipeline is communicated with the hot cavity of the heat exchanger 2 and is communicated with the oil storage tank 10, and an oil discharge control valve is installed on the oil discharge pipeline. The oil discharge pipeline is arranged to output the liquid oil gas reserved in the heat exchanger 2 to the oil storage tank 10, so that the oil gas is cooled and recovered.
The
The dehydration pipeline is also communicated with a heating pipeline, and a heater 4 is arranged on the heating pipeline. The heater 4 is provided to heat the exhaust gas from the dehydration device, thereby further improving the dehydration effect.
The
An oil outlet pipe is connected to the oil storage tank 10, and an
The
An oil gas recovery method using residual pressure cooling energy conservation comprises the following steps:
(1) waste gas enters a heat exchanger through a waste gas input pipeline to exchange heat and cool, and then is sent to a dehydration mechanism to be dehydrated;
(2) sending the dehydrated waste gas into an expansion machine for decompression and cooling, and then sending the waste gas into a gas-liquid separator for gas-liquid separation to obtain liquid hydrocarbon and lean oil gas;
(3) liquid hydrocarbon is sent into an oil storage tank for recovery, lean oil gas is sent into a heat exchanger for heat exchange with newly input waste gas, and then is sent into an adsorption mechanism for adsorption treatment;
(4) the adsorbed lean oil gas is sent into an exhaust pipeline to be discharged outwards, meanwhile, a vacuum pump carries out vacuum desorption on an adsorption mechanism, and the lean oil gas adsorbed by the adsorption mechanism and newly input waste gas are sent back into a heat exchanger to be treated again;
(5) the oil gas in the waste gas is recycled in such a way.
The application has the advantages that:
1. the cold energy after the oil gas is depressurized is fully utilized and used for condensing and recovering the oil gas, and the expansion machine is connected with the vacuum pump, so that the energy consumption required by oil gas recovery device equipment is reduced, and the problem of equipment cost during oil gas recovery is solved;
2. the automatic control degree is high, the reliability is high, the operation is simple, and the maintenance is convenient;
3. the expansion machine and the vacuum pump are mainly used for cold pressing, and a refrigeration compressor is not used, so that the energy consumption of equipment operation is greatly reduced;
4. the oil gas is firstly recovered by cooling the heat exchanger, secondarily recovered by cooling the oil gas by the expansion machine, and thirdly recovered by active carbon adsorption, so that the recovery rate of the oil gas is improved, the economic benefit of recovery equipment is enhanced, and the recovered liquid oil is stored in the oil storage tank, is visual and can be directly recycled;
5. the recovered oil gas is in the low temperature state, and the oil gas of low temperature state is difficult to burn, and the expander can be interlocked through the quick action emergency valve at the during operation, has guaranteed the security when oil gas retrieves.
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