A real-time mixing system for oil and gas combustion and explosion testing

Abstract

This utility model discloses a real-time gas mixing system for oil and gas combustion and explosion testing, including a mixing cylinder, an explosion-proof circulating pump, and a gas washing cylinder. One end of the mixing cylinder is connected to an outlet pipe, which is connected to the inlet end of the explosion-proof circulating pump. The outlet end of the explosion-proof circulating pump is connected to an inlet pipe through a first three-way valve. The other end of the mixing cylinder is connected to an inlet pipe, which is connected to an outlet pipe through a second three-way valve. A straight pipe is connected between the first and second three-way valves. The gas washing cylinder is filled with gasoline, and a sealing plug is installed at the top of the gas washing cylinder. The inlet pipe and the outlet pipe extend through the sealing plug into the interior of the gas washing cylinder. The inlet pipe is immersed in gasoline, and the outlet pipe is above the gasoline. A first ball valve is installed on the inlet pipe, a second ball valve is installed on the outlet pipe, a third ball valve is installed on the inlet pipe, a fourth ball valve is installed on the outlet pipe, and a fifth ball valve is installed on the straight pipe. Through a closed-loop circulation system and dynamic concentration control, precise regulation of oil and gas concentration is achieved, and uniform mixing of oil and gas is ensured, resulting in high safety.

Description

Technical Field

[0001] This utility model relates to the technical field of combustible gas experimental equipment, specifically a real-time gas mixing system for oil and gas combustion and explosion testing. Background Technology

[0002] Gasoline, as one of the most widely used fuels in the chemical industry, has a lower explosive limit of only 1.4% for its vapor-air mixture and a flash point as low as -43°C. During storage, transportation, and testing, the risk of gasoline vapor leakage is extremely high. When the leakage reaches 10% of the lower explosive limit, it can ignite upon contact with a static spark or a high-temperature surface, causing serious casualties and property damage.

[0003] Traditional gasoline vapor generation methods have fundamental flaws. The oil atomizer method is only suitable for coarse-precision scenarios such as painting. Due to insufficient negative pressure, the atomized particle size is >50μm, the oil-gas concentration fluctuates by more than ±25%, and the high-speed airflow causes the enrichment of light components, which cannot meet the requirements of the composition authenticity of combustion experiments.

[0004] The direct heating method results in extremely poor mixing uniformity, and localized overheating causes gasoline to decompose and generate gum, contaminating the experimental system. At the same time, the surface temperature of the heating element exceeds the auto-ignition point, posing a significant explosion hazard.

[0005] The above methods suffer from uncontrollable concentration, uneven mixing, and insufficient safety redundancy, resulting in insufficient steam utilization and significant environmental pollution risks. Therefore, this utility model proposes a real-time gas mixing system for oil and gas combustion and explosion tests that can solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a real-time gas mixing system for oil and gas combustion and explosion testing, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a real-time gas mixing system for oil and gas combustion and explosion testing, comprising a gas mixing bottle, an explosion-proof circulating pump and a gas washing bottle, wherein one end of the gas mixing bottle is connected to an outlet pipe, the outlet pipe is connected to the inlet end of the explosion-proof circulating pump, and the outlet end of the explosion-proof circulating pump is connected to an inlet pipe through a first three-way valve.

[0008] The other end of the gas mixing cylinder is connected to an air inlet pipe, and the air inlet pipe is connected to an outlet pipe through a second three-way valve. A straight pipe is connected between the first three-way valve and the second three-way valve.

[0009] The gas washing bottle is filled with gasoline, and a sealing plug is provided at the top of the gas washing bottle. The inlet tube and outlet tube extend through the sealing plug into the gas washing bottle. The inlet tube is immersed in gasoline, and the outlet tube is above the gasoline.

[0010] The intake pipe is equipped with a first ball valve, the exhaust pipe is equipped with a second ball valve, the inlet pipe is equipped with a third ball valve, the outlet pipe is equipped with a fourth ball valve, and the straight pipe is equipped with a fifth ball valve.

[0011] As a preferred technical solution, the inlet pipe is equipped with a flow meter.

[0012] As a preferred technical solution, the gas outlet pipe is equipped with a concentration detector.

[0013] As a preferred technical solution, the gas washing bottle has a sandwich structure, and the sandwich structure is circulated with constant temperature water for temperature control.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] Through a closed-loop circulation system and dynamic concentration control, precise regulation of oil and gas concentration is achieved, and oil and gas are uniformly mixed, resulting in high safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] In the diagram: 1. Mixing cylinder; 2. Second ball valve; 3. Outlet pipe; 4. Concentration detector; 5. Gas washing bottle; 6. Explosion-proof circulating pump; 7. First three-way valve; 8. Fifth ball valve; 9. Straight pipe; 10. Second three-way valve; 11. Inlet pipe; 12. First ball valve; 13. Third ball valve; 14. Inlet pipe; 15. Flow meter; 16. Sealing plug; 17. Outlet pipe; 18. Gasoline; 19. Fourth ball valve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1

[0020] Provides a real-time gas mixing system for oil and gas combustion and explosion testing:

[0021] The gas mixing cylinder 1 has a discharge pipe for discharging the mixed gas. A valve body is installed on the discharge pipe. A pressure gauge is installed on the gas mixing cylinder 1. One end of the gas mixing cylinder 1 is connected to an outlet pipe 3. The outlet pipe 3 is connected to the inlet end of the explosion-proof circulating pump 6. The outlet end of the explosion-proof circulating pump 6 is connected to an inlet pipe 14 through a first three-way valve 7. A flow meter 15 is installed on the inlet pipe 14. The flow meter 15 detects the gas flow rate. By controlling the flow rate of the gas drawn by the explosion-proof circulating pump 6, the flow meter 15 provides feedback and displays, thereby regulating the gas flow rate.

[0022] The other end of the gas mixing cylinder 1 is connected to an inlet pipe 11. The inlet pipe 11 is connected to an outlet pipe 17 through a second three-way valve 10. A straight pipe 9 is connected between the first three-way valve 7 and the second three-way valve 10. A concentration detector 4 is installed on the outlet pipe 3. The model of the concentration detector 4 can be selected from the market to meet the required operating environment.

[0023] The gas washing bottle 5 has a sandwich structure. The sandwich structure is filled with constant temperature water for temperature control. The temperature control accuracy is ≤±0.5℃. Gasoline 18 is injected into the gas washing bottle 5. A sealing plug 16 is set at the top of the gas washing bottle 5. The sealing plug 16 isolates the inside of the gas washing bottle 5 from the outside. The inlet pipe 14 and the outlet pipe 17 extend through the sealing plug 16 into the inside of the gas washing bottle 5. The inlet pipe 14 is immersed in the gasoline 18, and the outlet pipe 17 is higher than the gasoline 18.

[0024] The air inlet pipe 11, air outlet pipe 3, inlet pipe 14, outlet pipe 17, and straight pipe 9 can be made of transparent glass tubes. The air inlet pipe 11 is equipped with a first ball valve 12, the air outlet pipe 3 is equipped with a second ball valve 2, the inlet pipe 14 is equipped with a third ball valve 13, the outlet pipe 17 is equipped with a fourth ball valve 19, and the straight pipe 9 is equipped with a fifth ball valve 8. The first ball valve 12, the second ball valve 2, the third ball valve 13, the fourth ball valve 19, and the fifth ball valve 8 can be used to control the opening and closing of the pipes.

[0025] During the experiment, the first ball valve 12, the second ball valve 2, the third ball valve 13 and the fourth ball valve 19 are opened, the fifth ball valve 8 is closed, and the explosion-proof circulation pump 6 is turned on to draw gas and circulate it through the gas mixing bottle 1. The gas enters the gasoline 18 through the inlet pipe 14 and then is discharged. The gasoline 18 vapor carried out by the gas is received through the outlet pipe 17, so that the gasoline 18 vapor enters the gas mixing bottle 1. By controlling the circulation time and the gas flow rate, the generation and injection of the oil-gas mixture of the predetermined concentration are completed.

[0026] After completing the above operations, first turn off the explosion-proof circulation pump 6, open the first ball valve 12, the second ball valve 2 and the fifth ball valve 8, close the third ball valve 13 and the fourth ball valve 19, and then turn on the explosion-proof circulation pump 6. Determine the circulation time according to the volume of the mixing cylinder 1. After the gas mixing is completed, turn off the concentration detector 4 and the explosion-proof circulation pump 6. Through the closed-loop circulation system and dynamic concentration control, the oil and gas concentration can be accurately regulated and the oil and gas can be mixed evenly with high safety.

[0027] The above flow control and time setting methods:

[0028] During the system initialization phase, the standard flow rate Q (L / min) of the flow meter is preset to 15. Based on the target oil and gas concentration C (%) and the total system volume V (L), the following formula is used:

[0029] (1)

[0030] During the circulating gas mixing process, the concentration uniformity increases exponentially with time, and the concentration after circulation... satisfy: (2)

[0031] Among them, C 最终 The concentration when completely homogeneous;

[0032] In formula (2), k is a dimensionless value. It can be calculated from experimental data to be k=22.24. See Table 1 below for experimental data.

[0033] Taking a 4L mixing cylinder and a required vapor concentration of 2.5% as an example:

[0034] S1: Initialization settings: Fill the gas washing bottle 5 with 18g of 93# gasoline to 1 / 3 of its volume (approximately 200mL); maintain a constant temperature by circulating constant temperature water through the jacket structure; set the temperature of the gas washing bottle 5 to 30℃; the temperature fluctuation of the gas washing bottle 5 should be ≤±0.5℃; and the initial oil and gas concentration should be <0.1%.

[0035] S2: Open the first ball valve 12, the second ball valve 2, the third ball valve 13 and the fourth ball valve 19, and close the fifth ball valve 8;

[0036] S3: Flowmeter 15 is calibrated to 0.75 L / min, and the total volume of the measuring system V = + =4.5L;

[0037] S4: Start the concentration detector 4 and explosion-proof circulation pump 6, accurately calculate the gas injection cycle time, and when the gas injection operation continues for a certain period of time... =40.2s, the injection of the predetermined concentration of oil and gas mixture is completed;

[0038] S5: Turn off the explosion-proof circulating pump 6, open the first ball valve 12, the second ball valve 2 and the fifth ball valve 8, close the third ball valve 13 and the fourth ball valve 19, and then turn on the explosion-proof circulating pump 6.

[0039] When the uniformity is 95%, that is At t≈18 minutes, that is, after 18 minutes of circulation, the concentration detector 4 and the explosion-proof circulation pump 6 are turned off to complete the gas mixing process.

[0040] Intake time (s) Total system volume (L) Flow rate (L / min) concentration(%) 25 4.5 0.75 1.5 30 4.5 0.75 1.8 35 4.5 0.75 2.2 40 4.5 0.75 2.5 45 4.5 0.75 3.0 50 4.5 0.75 3.38 55 4.5 0.75 3.72 60 4.5 0.75 3.97 65 4.5 0.75 4.11 70 4.5 0.75 4.2 75 4.5 0.75 4.38 80 4.5 0.75 4.54 85 4.5 0.75 4.83 90 4.5 0.75 5.07

[0041] surface

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A real-time gas mixing system for oil and gas flammability testing, comprising: It includes a gas mixing cylinder (1), an explosion-proof circulating pump (6) and a gas washing cylinder (5). One end of the gas mixing cylinder (1) is connected to an outlet pipe (3), and the outlet pipe (3) is connected to the inlet end of the explosion-proof circulating pump (6). The outlet end of the explosion-proof circulating pump (6) is connected to an inlet pipe (14) through a first three-way valve (7). The other end of the gas mixing cylinder (1) is connected to an air inlet pipe (11), and the air inlet pipe (11) is connected to an outlet pipe (17) through a second three-way valve (10). A straight pipe (9) is connected between the first three-way valve (7) and the second three-way valve (10). The gas washing bottle (5) is filled with gasoline (18), and a sealing plug (16) is provided on the top of the gas washing bottle (5). The inlet tube (14) and outlet tube (17) extend through the sealing plug (16) to the inside of the gas washing bottle (5). The inlet tube (14) is immersed in the gasoline (18), and the outlet tube (17) is higher than the gasoline (18). The intake pipe (11) is equipped with a first ball valve (12), the exhaust pipe (3) is equipped with a second ball valve (2), the inlet pipe (14) is equipped with a third ball valve (13), the outlet pipe (17) is equipped with a fourth ball valve (19), and the straight pipe (9) is equipped with a fifth ball valve (8).

2. The real-time gas mixing system for oil and gas flammability testing of claim 1, wherein, The inlet pipe (14) is equipped with a flow meter (15).

3. The real-time gas mixing system for oil and gas flammability testing of claim 1, wherein, The outlet pipe (3) is equipped with a concentration detector (4).

4. The real-time gas mixing system for oil and gas flammability testing of claim 1, wherein, The gas washing bottle (5) has a sandwich structure, and the sandwich structure is filled with constant temperature water for temperature control.

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