Oil gas recovery system

Abstract

The utility model provides an oil gas recovery system, including oil gas treater and refrigerating unit, said refrigerating unit and oil gas treater are connected with heat transfer liquid inlet pipe and heat transfer liquid outlet pipe, oil gas treater includes stainless steel tank, oil gas inlet pipe, coil pipe, condensate outlet pipe, stainless steel tank is provided with the accommodation chamber, oil gas inlet pipe is provided with the heat transfer liquid inlet pipe, the coil pipe is provided with the condensate outlet pipe. The upper end of the coil pipe is connected with the oil gas inlet pipe, and the lower end of the coil pipe is connected with the condensate outlet pipe; the heat-carrying liquid flows into the containing cavity through the heat-carrying liquid inlet pipe and flows out of the containing cavity through the heat-carrying liquid outlet pipe, the heat-carrying liquid exchanges heat with fuel oil gas passing through the coil pipe in the containing cavity, condensation of the fuel oil gas is achieved, and then the fuel oil gas is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel oil and gas recovery, in particular to an oil and gas recovery system. Background Art

[0002] At gas stations, when refueling or tank trucks transporting gasoline to the tanks of gas stations, a certain amount of gasoline vapor will be generated. These gasoline vapors are discharged and released into the atmosphere to produce photochemical smog, which has an adverse effect on the human body. In the past, the commonly used methods for gasoline vapor treatment were: catalytic oxidation, adsorption, membrane separation, condensation, etc. The condensation method is usually atmospheric pressure condensation, which is mostly because the gasoline concentration in gasoline vapor is low, the overall energy consumption is high, and it brings high operating costs. Therefore, there is an urgent need for a more energy-saving and efficient device to recover gasoline vapor at gasoline loading and unloading sites to improve recovery efficiency and reduce recovery costs. Utility Model Content

[0003] The utility model aims to provide a gasoline vapor recovery system to process the discharged gasoline gas to achieve oil recovery and clean air discharge.

[0004] In order to achieve the above purpose and other purposes, the utility model is implemented through the following technical solutions: an oil and gas recovery system is provided, including an oil and gas processor and a refrigeration unit, a heat-carrying liquid inlet pipe and a heat-carrying liquid outlet pipe are connected between the refrigeration unit and the oil and gas processor, the oil and gas processor includes a stainless steel tank, an oil and gas inlet pipe, an oil and gas exchange coil, and a condensate outlet pipe, the stainless steel tank is provided with a accommodating cavity, the accommodating cavity is filled with heat-carrying liquid, the oil and gas inlet pipe extends from the top end of the stainless steel tank to the inside of the accommodating cavity, the condensate outlet pipe extends from the bottom end of the stainless steel tank to the inside of the accommodating cavity, the The oil-gas exchange coil is located in the accommodating cavity, the upper end of the oil-gas exchange coil is connected to the oil-gas inlet pipe, and the lower end of the oil-gas exchange coil is connected to the condensate outlet pipe. The oil and gas enter the oil-gas exchange coil through the oil-gas inlet pipe, exchange heat with the heat-carrying liquid in the accommodating cavity to become liquid, and then flow out of the stainless steel tank through the condensate outlet pipe; the heat-carrying liquid flows into the accommodating cavity through the heat-carrying liquid inlet pipe, and the heat-carrying liquid flows out of the accommodating cavity through the heat-carrying liquid outlet pipe. The heat-carrying liquid circulates between the refrigeration unit and the accommodating cavity through the heat-carrying liquid inlet pipe and the heat-carrying liquid outlet pipe.

[0005] Furthermore, the oil and gas recovery system also includes an oil and gas collector, which is arranged inside the accommodating cavity, the oil and gas collector is connected between the oil and gas inlet pipe and the upper end of the oil and gas exchange coil, and a stainless steel filter grid is arranged in the oil and gas collector.

[0006] Furthermore, the oil and gas recovery system also includes a condensate collector, which is arranged inside the accommodating cavity and connected between the lower end of the oil and gas exchange coil and the condensate outlet pipe.

[0007] Furthermore, the oil and gas recovery system also includes a threaded socket, which is located on the outside of the stainless steel tank, and the oil and gas inlet pipe is connected to the threaded socket.

[0008] Furthermore, the oil-gas exchange coil includes 8 conductive tubes, and the 8 conductive tubes extend from top to bottom in a folded shape.

[0009] Furthermore, the stainless steel tank comprises a tank body and a maintenance cover, the accommodating cavity is arranged on the tank body, and the maintenance cover is connected to the top of the accommodating cavity.

[0010] Furthermore, the tank body comprises an inner tank body and an outer tank body, the inner tank body is located inside the outer tank body, and a heat insulating material is arranged between the inner tank body and the outer tank body.

[0011] Furthermore, the refrigeration unit includes a plate evaporator, a heat-carrying liquid inlet and a heat-carrying liquid outlet, the heat-carrying liquid inlet and the heat-carrying liquid outlet are both connected to the plate evaporator, the heat-carrying liquid inlet pipe is connected to the heat-carrying liquid outlet, the heat-carrying liquid outlet pipe is connected to the heat-carrying liquid inlet, and the heat-carrying liquid circulates between the plate evaporator and the accommodating chamber through the heat-carrying liquid inlet pipe and the heat-carrying liquid outlet pipe.

[0012] Furthermore, the refrigeration unit also includes two hydraulic pumps, which are connected in parallel and communicated between the plate evaporator and the heat-carrying liquid outlet.

[0013] Furthermore, the refrigeration unit further comprises a heat-carrying liquid pressure tank, and the heat-carrying liquid pressure tank is connected between the hydraulic pump and the plate evaporator.

[0014] According to the utility model, a heat-carrying liquid inlet pipe and a heat-carrying liquid outlet pipe are connected between the refrigeration unit and the oil and gas processor. The refrigeration unit cools the heat-carrying liquid to a required temperature, and the heat-carrying liquid then enters the oil and gas processor through the heat-carrying liquid inlet pipe. The oil and gas exchange coil is arranged inside the oil and gas processor. The fuel and oil gas flow through the oil and gas exchange coil and then exchange heat with the heat-carrying liquid inside the oil and gas processor, thereby realizing condensation of the fuel and oil gas, and then recycling them. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic diagram of the vapor recovery process of the service station of the utility model.

[0016] Figure 2Display as Figure 1 Structural diagram of the Sinopec gas processing system E.

[0017] Figure 3 The diagram shows the internal structure of the oil and gas processor after some of the side panels have been removed.

[0018] Figure 4 Shown is the overall structural diagram of the oil and gas processor.

[0019] Figure 5 Shown is the overall structural diagram of the refrigeration unit from the first angle.

[0020] Figure 6 Shown is the overall structural diagram of the refrigeration unit from a second angle. DETAILED DESCRIPTION

[0021] See also Figures 1 to 6 . The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0022] The system of the utility model allows vapor recovery by low temperature, and is capable of processing the vapors generated during the loading and service process of gasoline distribution stations and centers, and is installed in the last block of the supply equipment in the area of ​​vapor recovery vents and pipes. The vapor processor 1 can convert these vapors into liquid gasoline that can be measured.

[0023] The vapor processor 1 includes a tank 10, which is made entirely of stainless steel. Different pipelines are arranged according to the existing recovery and exhaust of the factory. Its design allows the gasoline oil gas to flow at a certain speed and pressure so that the distillate can be precipitated at a sufficient and constant temperature. The resulting product (liquid gasoline) can be brought back to the tank for use. The vapor processor 1 is filled with heat-carrying liquid and is connected to the refrigeration unit 2 through a hydraulic system, which ensures a constant temperature of the precipitate. All control sensors are located inside the vapor processor 1, the electrical connection does not generate sparks, the weld pipe is X-rayed, and an overpressure vacuum valve is installed.

[0024] Refrigeration unit 2, equipped with a heat transfer fluid cooler, is remotely mounted in a designated area, in compliance with safety regulations and certifications, including ATEX. Said refrigeration unit 2 includes all operating controls, capable of transmitting acquired data to the control room via cables or WIFI.

[0025] The only connection between the refrigeration unit 2 and the oil and gas processor 1 is the heat-carrying liquid inlet pipe 3 and the heat-carrying liquid outlet pipe 4. The heat-carrying liquid inlet pipe 3 and the heat-carrying liquid outlet pipe 4 are properly insulated and protected to prevent the impact caused by bad weather.

[0026] The control system is a display interface designed and programmed to maintain control of processor variables such as temperature, pressure, flow, voltage, which enables these variables to be displayed in real time and recorded in a database, and it can modify the data through a remote monitoring system.

[0027] Figure 1 The generation of gasoline vapors at a gas station is shown, which occurs in two important stages of the gas station operation. Stage 1 refers to the discharge of gasoline from tanker A to the tank B at the gas station. During this process, since tank B is located on the ground of the gas station, the gasoline is released from tanker A to tank B by gravity. The impact of the liquid when falling creates turbulence, which causes the liquid to evaporate in tank B. The second stage of gasoline vapor generation is during the process of dispensing gasoline to the end customer by the dispensing gun G of the filling station H. These accumulated vapors are transported to tank B through exhaust pipe C1 to protect the service station from overpressure. The overpressure generated in tank B is released to the environment through exhaust pipe C2 and vacuum overpressure valve D. Exhaust pipe C2 is equipped with a bypass pipe F, which allows part of the gasoline vapor to be transported to the vapor recovery system E. The vapor recovery system E recovers hydrocarbons such as gasoline vapor and is installed within the scope of service stations and distribution centers.

[0028] The oil and gas recovery system E includes the oil and gas processor 1 and the refrigeration unit 2. The oil and gas processor 1 and the refrigeration unit 2 are connected via a heat carrier liquid inlet pipe 3 and a heat carrier liquid outlet pipe 4. The oil and gas processor 1 is responsible for internally exchanging heat between the oil and gas and the heat carrier liquid, causing the physical state of the oil and gas to change from gaseous to liquid. This oil and gas treatment is possible because of the cooperation between the oil and gas processor 1 and the refrigeration unit 2. The refrigeration unit 2 is responsible for cooling the heat carrier liquid to a determined and controlled temperature. The heat carrier liquid is transported to the oil and gas processor 1 and enables it to exchange heat with the oil and gas. After the recovery process is completed, the liquid generated by the oil and gas recovery system E returns to the storage tank B. The recovery of the liquid is controlled by the control system (J) of the refrigeration unit 2, which can be located in the office of the gas station, and also includes an alarm control console K, the DC voltage of which is 0-10V and the current is between 4-20mA, whereby we are able to treat the gasoline gas at low temperatures, rather than very low temperatures, sufficient to cause a violent and rapid reaction of the hydrocarbon gas.

[0029] Specifically, please refer to Figure 3 The oil and gas processor 1 includes a stainless steel tank 10, which is made entirely of stainless steel. Figure 2 The stainless steel tank 10 has a receiving cavity, which is composed of 6 side plates 104 that are perfectly sealed by welding, and the receiving cavity is filled with 100% of the heat-carrying liquid. The heat-carrying liquid is cooled in advance by the refrigeration unit 2, which allows the heat-carrying liquid to maintain a constant temperature and fluidity. An oil-gas exchange coil 12 is arranged inside the stainless steel tank 10, and the oil-gas exchange coil 12 is composed of 8 conductive tubes 121 also made of stainless steel, and the 8 conductive tubes extend from top to bottom in a folded shape. The design of the oil-gas exchange coil 12 enables the heat exchange AC power range to reach 9166w-23650w. The oil-gas processor 1 also includes an oil-gas collector 14, which is arranged inside the receiving cavity, and the oil-gas collector 14 is connected to the upper end of the oil-gas exchange coil 12, that is, the 8 conductive tubes 121 are connected to the oil-gas collector 14 at the upper end. The oil and gas collector 14 is capable of receiving oil and gas velocities in the range of 1 to 17 m / s. The oil and gas collector 14 has a stainless steel network inside, which is responsible for receiving oil and gas flowing at a certain speed and pressure to precipitate distillates at a sufficient and constant temperature. The oil and gas inlet pipe 11 extends from the top of the stainless steel tank 10 to the inside of the accommodating cavity and is connected to the oil and gas collector 14, that is, the oil and gas collector 14 is connected between the oil and gas inlet pipe 11 and the oil and gas exchange coil 12. The oil and gas inlet pipe 11 is connected to the threaded socket outside the stainless steel tank 10, and the threaded socket is used to connect the oil and gas transmission pipeline from the storage tank B. The oil and gas from the storage tank B enter the oil and gas inlet pipe 11 through the threaded socket, and then enter the oil and gas collector 14, and the oil and gas collector 14 distributes the entering oil and gas to 8 conductive pipes 121. Therefore, the oil and gas flow through the 8 conductive pipes 121 and begin to change the physical state after contacting the wall of the conductive pipe 121. Once this journey is completed, the resulting product, i.e., the liquid after the gasoline and oil gas are condensed, is brought to the lower part of the oil-gas exchange coil 12. The condensate outlet pipe 13 extends from the bottom end of the stainless steel tank 10 to the inside of the accommodating chamber and is connected to the lower end of the oil-gas exchange coil 12. These liquids are then transported back to the designated storage tank B of each service station through the condensate outlet pipe 13 for use. The oil-gas processor 1 also includes a condensate collector 15, which is located inside the accommodating chamber and is connected between the oil-gas exchange coil 12 and the condensate outlet pipe 13. The liquid in the oil-gas exchange coil 12 flows by the sum of gravity and pressure and is first collected in the condensate collector 15. These liquids are then transported back to the designated storage tank B of each service station through the condensate outlet pipe 13 for use.

[0030] The stainless steel tank 10 includes a tank body 101 and a maintenance cover 102. The accommodating cavity is arranged on the tank body 101. The tank body 101 includes an outer tank body 1011 and an inner tank body 1012. It can be understood that the six side panels 104 are double-layered, the outer layers of the six side panels 104 constitute the outer tank body 1011, and the inner layers of the six side panels 104 constitute the inner tank body 1012. A heat insulating material layer 103 is filled between the inner tank body 1012 and the outer tank body 1011. The maintenance cover 102 is connected to the upper part of the accommodating cavity.

[0031] Figure 5 and Figure 6 All of them are structural schematic diagrams of the refrigeration unit 2. The refrigeration unit 2 is a universal glycol refrigeration machine, composed of the basic elements required by this type of refrigeration system to perform the task of cooling a specific heat-carrying liquid and producing a refrigeration product capable of carrying hydrocarbon vapor, and includes a hydraulic system that allows the heat-carrying liquid to be delivered to the oil and gas processor 1. The refrigeration unit 2 has a control cabinet, in which the main control system of the unit is arranged, including a programmable logic controller and a human-machine interface, which allows the creation of a specific programming code for receiving and processing data received by the sensors of the vapor recovery system E. This code is unique and original, allowing us to store data, generate reports and operate alarms. The control system allows us to measure and record the values ​​of two important variables of the vapor recovery system E, such as the vapor pressure of the system and the flow rate of the liquid recovered through the system. The control system also allows us to control the main operating variable, the temperature of the heat-carrying liquid, and keep it between -5° and -30° to meet the heat exchange power of the oil and gas processor 1.

[0032] The refrigeration unit 2 mainly includes the following components: compressor 24, high and low pressure switches, liquid storage tank, fan speed regulator, voltage transformer, liquid suction device, liquid filter, liquid sight glass, fan, control cabinet, low refrigerant pressure gauge, high refrigerant pressure gauge, pump pressure gauge, pump pressure gauge, heat-carrying liquid inlet connection 22, heat-carrying liquid outlet connection 23, condenser coil 26, hydraulic pump 27, hydraulic pump 28, hydraulic stepping valve, hydraulic solenoid valve, refrigerant solenoid valve 25, plate exchanger 21, heat-carrying liquid pressure tank 29, programmable logic control, display interface-HMI.

[0033] Among them, the heat-carrying liquid inlet 22 is connected to the heat-carrying liquid outlet pipe 4 and the plate exchanger 21, and the heat-carrying liquid returned from the stainless steel tank 10 flows into the plate exchanger 21 through the heat-carrying liquid outlet pipe 4 and the heat-carrying liquid inlet 22 successively. The heat-carrying liquid outlet 23 connects the plate exchanger 21 and the heat-carrying liquid inlet pipe 3. The heat-carrying liquid cooled by the plate exchanger 21 flows through the heat-carrying liquid outlet 23 and the heat-carrying liquid inlet pipe 3 successively and then flows into the stainless steel tank 10, thereby condensing the gasoline oil and gas in the oil-gas exchange coil 12, and the heat-carrying liquid circulates between the plate exchanger 21 and the accommodating cavity through the heat-carrying liquid inlet pipe 3 and the heat-carrying liquid outlet pipe 4. The refrigerant of the refrigeration unit 2 absorbs heat from the heat-carrying liquid in the plate exchanger 21 and evaporates, thereby reducing the temperature of the heat-carrying liquid. The heat-carrying liquid after cooling flows back into the containing cavity to condense the gasoline and oil gas entering the stainless steel tank 10, and the refrigerant after absorbing heat and evaporating is compressed by the compressor 24, then condensed by the condenser coil 26, and then throttled by the refrigerant solenoid valve 25, and finally returns to the plate exchanger 21 to exchange heat with the returned heat-carrying liquid, and the cycle continues. The hydraulic pump 27 and the hydraulic pump 28 are connected in parallel, connected between the plate exchanger 21 and the heat-carrying liquid outlet 23, and provide sufficient head to allow the heat-carrying liquid to flow into the stainless steel tank 10. The heat-carrying liquid pressure tank 29 is connected between the parallel hydraulic pumps 27 and the hydraulic pumps 28 and the plate exchanger 21, and as a transfer container for the heat-carrying liquid, it can balance the pressure of the heat-carrying liquid circulation path.

Claims

1. An oil and gas recovery system, characterized in that: include An oil and gas processor, the oil and gas processor comprises a stainless steel tank, an oil and gas inlet pipe, an oil and gas exchange coil, and a condensate outlet pipe. The stainless steel tank is provided with a accommodating cavity, the accommodating cavity is filled with a heat-carrying liquid, the oil and gas inlet pipe extends from the top end of the stainless steel tank to the inside of the accommodating cavity, the condensate outlet pipe extends from the bottom end of the stainless steel tank to the inside of the accommodating cavity, the oil and gas exchange coil is located in the accommodating cavity, the upper end of the oil and gas exchange coil is connected to the oil and gas inlet pipe, the lower end of the oil and gas exchange coil is connected to the condensate outlet pipe, the oil and gas enter the oil and gas exchange coil through the oil and gas inlet pipe, and after exchanging heat with the heat-carrying liquid in the accommodating cavity and becoming liquid, it flows out of the stainless steel tank through the condensate outlet pipe; A refrigeration unit, wherein a heat-carrying liquid inlet pipe and a heat-carrying liquid outlet pipe are connected between the refrigeration unit and the oil and gas processor, the heat-carrying liquid flows into the accommodating cavity through the heat-carrying liquid inlet pipe, the heat-carrying liquid flows out of the accommodating cavity through the heat-carrying liquid outlet pipe, and the heat-carrying liquid circulates between the refrigeration unit and the accommodating cavity through the heat-carrying liquid inlet pipe and the heat-carrying liquid outlet pipe.

2. The oil and gas recovery system according to claim 1, characterized in that: The oil and gas recovery system also includes an oil and gas collector, which is arranged inside the accommodating cavity, connected between the oil and gas inlet pipe and the upper end of the oil and gas exchange coil, and a stainless steel filter grid is arranged inside the oil and gas collector.

3. The oil and gas recovery system according to claim 2, characterized in that: The oil and gas recovery system further includes a condensate collector, which is disposed inside the accommodating cavity and connected between the lower end of the oil and gas exchange coil and the condensate outlet pipe.

4. The oil vapor recovery system according to claim 1, characterized in that: The oil and gas recovery system also includes a threaded socket, which is located on the outside of the stainless steel tank, and the oil and gas inlet pipe is connected to the threaded socket.

5. The oil and gas recovery system according to claim 3, characterized in that: The oil-gas exchange coil comprises 8 conductive tubes, and the 8 conductive tubes extend from top to bottom in a folded shape.

6. The oil vapor recovery system according to claim 1, characterized in that: The stainless steel tank comprises a tank body and a maintenance cover, the accommodating cavity is arranged on the tank body, and the maintenance cover is connected to the top of the accommodating cavity.

7. The oil and gas recovery system according to claim 6, characterized in that: The tank body comprises an inner tank body and an outer tank body, the inner tank body is located inside the outer tank body, and a heat insulation material layer is arranged between the inner tank body and the outer tank body.

8. An oil and gas recovery system according to any one of claims 1 to 7, characterized in that: The refrigeration unit includes a plate evaporator, a heat-carrying liquid inlet and a heat-carrying liquid outlet, the heat-carrying liquid inlet and the heat-carrying liquid outlet are both connected to the plate evaporator, the heat-carrying liquid inlet pipe is connected to the heat-carrying liquid outlet, the heat-carrying liquid outlet pipe is connected to the heat-carrying liquid inlet, and the heat-carrying liquid circulates between the plate evaporator and the accommodating chamber through the heat-carrying liquid inlet pipe and the heat-carrying liquid outlet pipe.

9. The oil vapor recovery system according to claim 8, characterized in that: The refrigeration unit further comprises two hydraulic pumps, which are connected in parallel and communicated between the plate evaporator and the heat-carrying liquid outlet.

10. The oil vapor recovery system according to claim 9, characterized in that: The refrigeration unit further comprises a heat-carrying liquid pressure tank, and the heat-carrying liquid pressure tank is connected between the hydraulic pump and the plate evaporator.

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