Natural gas ejector

Abstract

The utility model discloses a natural gas ejector. Comprising a pressing sleeve, a nozzle, a shell, a mixing chamber, a diffusion chamber, a non-standard flange A, a non-standard flange B, a sleeve A, a non-standard flange C, a non-standard flange D and a sleeve B, the nozzle is arranged at the front end of the shell, and the pressing sleeve is located at the front end of the nozzle; a sleeve B is arranged at the rear end of the shell, and a mixing chamber is formed in an inner cavity of the sleeve B; the sleeve B is in butt joint with the sleeve A, and a diffusion chamber is formed in an inner cavity of the sleeve A; and the mixing chamber is communicated with the diffusion chamber. The utility model belongs to a set of technology and complete equipment suitable for recycling single-well low-pressure sulfur-containing natural gas. The recovery processing capacity is actually designed according to working conditions, the requirement for single-well low-pressure sulfur-containing natural gas pressurization recovery is met, and environmental pollution caused by emission of the low-pressure sulfur-containing natural gas is avoided.

Description

Technical Field

[0001] The utility model relates to the field of natural gas recovery and processing, in particular to a natural gas ejector. Background Art

[0002] At present, there is no mature low-pressure sour natural gas recovery and utilization technology in China. Low-pressure sour natural gas produced from a single well is generally flared and discharged, which causes a large waste of natural gas energy, pollutes the environment, and endangers the occupational health and safety of related personnel.

[0003] At present, in the process of foreign natural gas development, the recovery and utilization of low-pressure sour natural gas all adopts the compressor boosting process. The sour-resistant natural gas compressor consumes huge energy, has high maintenance costs, unstable gas volume, large investment, and high risks. At the same time, the boosting process is complicated, the equipment is huge, and the system relies heavily, which is not very applicable. Therefore, it is urgent to develop a safe process technology and complete set of equipment suitable for single-well gas production of low-pressure sour natural gas. Ultimately, the high-sulfur gas single well can meet the process technology requirements of safe production and fully enclosed operation. At present, there is no actual successful application of single-well low-pressure sour gas. Utility Model Content

[0004] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a natural gas ejector, which is a technology and a complete set of equipment suitable for the recovery and utilization of single-well low-pressure sour natural gas, and can be applied to the natural gas recovery and processing system; the recovery and processing capacity is designed according to the actual working conditions to meet the requirements of pressurized recovery of single-well low-pressure sour natural gas, so as to avoid environmental pollution caused by the emission of low-pressure sour natural gas.

[0005] The utility model is implemented in this way, constructing a natural gas ejector; including a compression sleeve, a nozzle, a shell, a mixing chamber, a pressure diffusion chamber, a non-standard flange A, a non-standard flange B, a sleeve A, a non-standard flange C, a non-standard flange D and a sleeve B;

[0006] A nozzle is arranged at the front end of the shell, and a compression sleeve is located at the front end of the nozzle;

[0007] A sleeve B is disposed at the rear end of the shell, and the inner cavity of the sleeve B forms a mixing chamber;

[0008] The sleeve B is butted against the sleeve A, and the inner cavity of the sleeve A forms a diffusion chamber;

[0009] The mixing chamber and the diffusion chamber are in communication.

[0010] The front end of the optimized compression sleeve is used to connect with the working fluid end and form a connection. The rear end of the optimized diffusion chamber is used to connect with the compressed fluid end through the non-standard flange C and form a connection.

[0011] Optimized; the lower end of the shell is used to dock with the ejection fluid end through a non-standard flange D; and form a connection.

[0012] Optimized; the nozzle is snapped onto the front end of the shell.

[0013] Optimized; the mixing chamber and the diffusion chamber are butt-jointed and fixed via non-standard flange A and non-standard flange B.

[0014] Optimized; the nozzle corresponds to the front end of the natural gas ejector, and the diffusion chamber corresponds to the rear end position of the natural gas ejector.

[0015] The utility model has the following advantages: The utility model provides a natural gas ejector, including a compression sleeve, a nozzle, a shell, a mixing chamber, a pressure diffusion chamber, a non-standard flange A, a non-standard flange B, a casing A, a non-standard flange C, a non-standard flange D, and a casing B; the application belongs to a set of technology and complete equipment suitable for the recovery and utilization of low-pressure sour natural gas in a single well; the recovery and processing capacity is designed according to the actual working conditions, meeting the requirements of the pressurized recovery of low-pressure sour natural gas in a single well, so as to avoid the pollution of the environment by the discharge of low-pressure sour natural gas. The improved working nozzle process: (1) After the working fluid enters the working nozzle, it undergoes the following processes; a. Pressure reduction and acceleration process: the gas is depressurized and accelerated in the tapered nozzle flow channel, and the speed and pressure of the gas reach the critical value when it reaches the nozzle throat. b. Pressure diffusion and acceleration process: after the gas passes through the nozzle throat, it is further accelerated on the nozzle expansion section, so that the flow rate exceeds the critical value. (2) Carrying and mixing stage: after the high-speed working fluid flowing out of the nozzle enters the receiving chamber, the dynamic pressure of the high-speed fluid at the nozzle outlet is lower than the static pressure of the ejection fluid entering the annular space of the receiving chamber. The working fluid carries the ejection fluid into the mixing chamber. In the mixing chamber, the ejection fluid is fully mixed under the impact of the high-speed working airflow. (3) Diffusion recovery process: After the high and low pressure fluids are fully mixed, the flow rate gradually decreases and the pressure gradually recovers in the diffuser pipe. Finally, the flow rate reaches the pipeline speed, and the pressure is restored to a higher pressure than the ejection fluid (pressurizing the ejection fluid) and lower than the pressure value of the working fluid, and enters the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the external structure diagram of this application;

[0017] Figure 2 This is a schematic diagram of the interior of the natural gas ejector of the present application;

[0018] Figure 3 This application Figure 2 Middle DD section view.

[0019] Among them: working fluid end 1, compression fluid end 2, ejection fluid end 3, compression sleeve 4, nozzle 5, shell 6, mixing chamber 7, diffusion chamber 8, non-standard flange A9, non-standard flange B10, sleeve A11, non-standard flange C12, non-standard flange D13, sleeve B14. DETAILED DESCRIPTION

[0020] The following will be combined with the attached Figure 1-Figure 3 The utility model is described in detail, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model provides a natural gas ejector, such as Figure 1-Figure 3 As shown; including a compression sleeve 4, a nozzle 5, a shell 6, a mixing chamber 7, a diffusion chamber 8, a non-standard flange A9, a non-standard flange B10, a sleeve A11, a non-standard flange C12, a non-standard flange D13, and a sleeve B14;

[0022] The front end of the housing 6 is provided with a nozzle 5, and the compression sleeve 4 is located at the front end of the nozzle 5;

[0023] A sleeve B14 is disposed at the rear end of the housing 6, and the inner cavity of the sleeve B14 forms a mixing chamber 7;

[0024] The sleeve B14 is connected to the sleeve A11, and the inner cavity of the sleeve A11 forms a diffusion chamber 8;

[0025] The mixing chamber 7 and the diffusion chamber 8 are in communication.

[0026] In the natural gas ejector described in the present application, the front end of the compression sleeve 4 is used to dock with the working fluid end 1 and form a connection.

[0027] In the natural gas ejector described in the present application, the rear end of the diffusion chamber 8 is used to connect with the compressed fluid end 2 through a non-standard flange C12 to form a connection.

[0028] In the natural gas ejector described in the present application, the lower end of the shell 6 is used to dock with the ejection fluid end 3 through a non-standard flange D13 to form a connection.

[0029] In the natural gas ejector described in the present application, the nozzle 5 is snap-fitted to the front end of the housing 6 .

[0030] In the natural gas ejector described in the present application, the mixing chamber 7 and the diffusion chamber 8 are butt-jointed and fixed via a non-standard flange A9 and a non-standard flange B10.

[0031] In the natural gas ejector described in the present application, the nozzle 5 corresponds to the front end of the natural gas ejector, and the diffusion chamber 8 corresponds to the rear end of the natural gas ejector.

[0032] The present application relates to a technology and complete set of equipment suitable for the recovery and utilization of low-pressure sour natural gas from a single well. The recovery and processing capacity is designed according to the actual working conditions to meet the requirements for pressurized recovery of low-pressure sour natural gas from a single well, thereby avoiding environmental pollution caused by the emission of low-pressure sour natural gas.

[0033] The following is a detailed description of the natural gas ejector pressurization process in this application;

[0034] Working nozzle process:

[0035] (1) After the working fluid enters the working nozzle, it goes through the following process:

[0036] a. Pressure reduction and acceleration process: The gas is accelerated and depressurized in the tapered nozzle flow channel. When the gas reaches the nozzle throat, both the velocity and pressure reach the critical value.

[0037] b. Diffusion and acceleration process: After the gas passes through the nozzle throat, it is further accelerated in the nozzle expansion section, causing the flow rate to exceed the critical value.

[0038] (2) Carrying and mixing stage: After the high-speed working fluid flowing out of the nozzle enters the receiving chamber, the dynamic pressure of the high-speed fluid at the nozzle outlet is lower than the static pressure of the ejected fluid entering the annular space of the receiving chamber. The working fluid carries the ejected fluid into the mixing chamber. In the mixing chamber, the ejected fluid is fully mixed under the impact of the high-speed working airflow.

[0039] (3) Diffusion and pressure recovery process: After being fully mixed, the high and low pressure fluids gradually decrease in velocity and recover pressure in the diffuser pipe. Finally, the velocity reaches the pipeline speed and the pressure is higher than that of the ejector fluid (pressurizing the ejector fluid) and lower than that of the working fluid, and enters the pipeline system.

[0040] Design of technical measures;

[0041] A. Install a one-way valve and a stop valve on the low-pressure sulfur-containing natural gas pipeline to prevent overpressure caused by shutting off the external gas transmission and reflux. Add a flow meter and a pressure gauge to measure the exhaust volume of the sewage tanker and observe the pressure change. The pressure level and material of the stop valve to the separator pipeline are the same. The pressure level and material of the stop valve to the sewage tank connection pipeline are the same as the sewage tank.

[0042] B. Stop valves shall be installed at the gas phase outlet of the sewage tank and the exhaust pipe of the sewage tank truck to prevent the exhaust gas of the sewage tank truck from entering the low-pressure gas of the sewage tank and causing safety accidents. The exhaust gas shall enter the venting torch.

[0043] C. The torch does not ignite in normal production status;

[0044] D. In an emergency situation, venting and ignition can be implemented by relying on the original process.

[0045] E. Venturi tube jet boost recovery, due to slight vibration due to flow velocity changes, a pipeline should be set to fix it.

[0046] F. The venturi tube jet booster flow expansion will produce temperature drop and pressure drop. The temperature and pressure of the natural gas at the outlet of the water jacket furnace should be appropriately adjusted.

[0047] Technical advantages: 1. It can be applied to flash gas recovery of triethylene glycol unit. 2. Low-pressure natural gas recovery in wellhead gas production wastewater tank. 3. Single well and gas gathering station realize fully enclosed operation during normal production, fully enclosed wastewater transportation, low-pressure natural gas is not discharged for ignition, and the combustion of sulfur-containing natural gas pollutes the environment and reduces the occupational injury of operating staff.

[0048] Application prospects of the results:

[0049] 1. It can meet the national safety standards related to low-pressure recovery of sour natural gas.

[0050] 2. Low-pressure natural gas, biogas, coal-bed methane, etc. can be recycled and utilized in the later stage.

[0051] 3. Highly skid-mounted equipment can be quickly promoted and used on a large scale in the international and domestic markets.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A natural gas ejector, characterized in that; It includes a compression sleeve (4), a nozzle (5), a shell (6), a mixing chamber (7), a diffusion chamber (8), a non-standard flange A (9), a non-standard flange B (10), a sleeve A (11), a non-standard flange C (12), a non-standard flange D (13) and a sleeve B (14); A nozzle (5) is disposed at the front end of the housing (6), and a compression sleeve (4) is located at the front end of the nozzle (5); A sleeve B (14) is disposed at the rear end of the housing (6), and the inner cavity of the sleeve B (14) forms a mixing chamber (7); The sleeve B (14) is butt-jointed with the sleeve A (11), and the inner cavity of the sleeve A (11) forms a diffusion chamber (8); The mixing chamber (7) and the diffusion chamber (8) are in communication.

2. A natural gas ejector according to claim 1, characterized in that; The front end of the compression sleeve (4) is used to butt against the working fluid end (1) to form a connection.

3. A natural gas ejector according to claim 1, characterized in that; The rear end of the diffusion chamber (8) is connected to the compressed fluid end (2) via a non-standard flange C (12) to form a connection.

4. A natural gas ejector according to claim 1, characterized in that; The lower end of the housing (6) is connected to the ejection fluid end (3) via a non-standard flange D (13) to form a connection.

5. A natural gas ejector according to claim 1, characterized in that; The nozzle (5) is snap-fitted onto the front end of the housing (6).

6. A natural gas ejector according to claim 1, characterized in that; The mixing chamber (7) and the diffusion chamber (8) are butt-jointed and fixed via a non-standard flange A (9) and a non-standard flange B (10).

7. A natural gas ejector according to claim 1, characterized in that; The nozzle (5) corresponds to the front end of the natural gas ejector, and the diffusion chamber (8) corresponds to the rear end of the natural gas ejector.

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