Device for preparing high-energy cutting gas from high-purity methane rectification tail gas

Abstract

The utility model relates to the technical field of methane rectification tail gas reutilization, and discloses a device for preparing high-energy cutting gas by utilizing high-purity methane rectification tail gas, which comprises a first buffer tank, a first compressor, a proportioning cabinet, a second buffer tank and a second compressor which are sequentially connected through a gas pipeline, the proportioning cabinet is connected with a synergist storage tank through a feeding pipeline, and air leakage detection devices are arranged at the joints of the proportioning cabinet and the gas conveying pipeline. The high-energy cutting gas can be prepared from the methane rectification tail gas, so that the problem of energy sources is solved, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of methane distillation tail gas reuse, and in particular to an apparatus for preparing high-energy cutting gas from high-purity methane distillation tail gas. Background Technology

[0002] High-purity methane refers to methane with a CH4 volume fraction ≥ 99.999%. As a specialty gas, high-purity methane can be used as a standard gas, calibration gas, catalyst evaluation gas, for preparing certain special mixed gases, and for research on certain mechanisms. As an electronic gas, it can be used as an auxiliary additive gas in the deposition, epitaxy, and dry etching (or plasma etching) of large-scale integrated circuit thin films.

[0003] High-purity methane is produced from LNG or methane as raw material through a double distillation tower process, which generates a large amount of distillation tail gas (natural gas or methane). This tail gas is flammable, explosive, and a greenhouse gas, with a warming capacity 25 times that of carbon dioxide. It cannot be discharged or treated, and treating the tail gas by combustion would result in a waste of resources. Therefore, how to treat distillation tail gas more efficiently remains a key research focus. Utility Model Content

[0004] In order to recover and utilize high-purity methane distillation tail gas and save energy, this application provides an apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas.

[0005] This application provides the following technical solution:

[0006] An apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas includes a first buffer tank, a first compressor, a proportioning cabinet, a second buffer tank, and a second compressor connected in sequence via a gas transmission pipeline. An synergist storage tank is connected to the proportioning cabinet via a feed pipeline. Leakage detection devices are installed at the connection points between the proportioning cabinet and the gas transmission pipeline.

[0007] By adopting the above technical solution and adding a reasonably proportioned synergist, high-energy cutting gas can be prepared from methane distillation tail gas, making full use of the tail gas generated during the high-purity methane distillation process and reducing the waste of distillation tail gas resources. Furthermore, the high-energy cutting gas prepared by this method can replace acetylene cutting gas in some cases in existing technologies, making it a cleaner, more economical, environmentally friendly, and safer cutting gas. The installation of a leak detection device can detect the sealing of the connections between the front and rear of the mixing cabinet, allowing for timely detection of any leaks.

[0008] Optionally, the first compressor is a diaphragm compressor, and the second compressor is a reciprocating piston compressor.

[0009] Optionally, the side wall of the mixing cabinet is provided with a connecting pipe for connecting to the gas pipeline. The gas leakage detection device includes a first cylinder connected to the connecting pipe, a second cylinder connected to the gas pipeline, and an airbag connected to the side wall of the first cylinder or the second cylinder. The first cylinder and the second cylinder can be connected to each other, and the connection between the connecting pipe and the gas pipeline is located in the space enclosed by the first cylinder and the second cylinder.

[0010] By adopting the above technical solution, the first cylinder and the second cylinder surround the connection between the connecting pipe and the gas supply pipe, so that when air leakage occurs at the connection, the airbag can be inflated and expanded, and the state of the airbag can be observed to determine whether there is an air leakage.

[0011] Optionally, both the outer wall of the gas supply pipe and the outer wall of the connecting pipe are provided with abutting members. The first cylinder slides on the outer wall of the connecting pipe, and the second cylinder slides on the outer wall of the gas supply pipe. The ends of the first cylinder and the second cylinder that are close to each other are connected, and the abutting members abut against the inner wall of the adjacent first cylinder or second cylinder.

[0012] By adopting the above technical solution, the contacting element presses against the inner end faces of the first and second cylinders, thereby improving the sealing performance and making it more conducive to the expansion of the airbag in case of leakage.

[0013] Optionally, the outer wall of the first cylinder is provided with an annular edge, and a connecting cylinder is slidably provided on the outer wall of the first cylinder. The annular edge can abut against the inner end face of the connecting cylinder, and one end of the connecting cylinder can be threaded to the side wall of the second cylinder.

[0014] By adopting the above technical solution, the connecting cylinder is threaded to the side wall of the second cylinder, thereby connecting the first cylinder and the second cylinder together, and making the end faces of the first cylinder and the second cylinder abut together.

[0015] Optionally, the abutting element includes a connecting ring disposed on the side wall of the connecting pipe and the gas transmission pipeline, and an abutting ring connected to the connecting ring. An elastic element is disposed between the connecting ring and the abutting ring. When the first cylinder and the second cylinder are connected, the elastic element drives the abutting ring to press against the inner end face of the first cylinder and the second cylinder.

[0016] By adopting the above technical solution, the elastic element drives the contact ring to press against the inner wall of the first cylinder and the second cylinder, thereby improving the sealing performance between the first cylinder and the second cylinder and the contact ring, thus improving the sealing performance in the sealing space of the first cylinder and the second cylinder, and better facilitating the timely expansion of the airbag.

[0017] Optionally, a sealing ring is provided on the side of the abutment ring opposite to the connecting ring.

[0018] By adopting the above technical solution, the sealing performance between the contact ring and the first and second cylinders is further improved.

[0019] Optionally, the elastic element is a spring, and the spring is connected between the abutment ring and the connecting ring.

[0020] By adopting the above technical solution, sufficient elasticity is provided so that the contact ring can press against the first cylinder and the second cylinder.

[0021] Optionally, an elastic layer is provided on the end face of the first cylinder or the second cylinder.

[0022] By adopting the above technical solution, the sealing performance of the contact surface between the first cylinder and the second cylinder is improved.

[0023] In summary, this application includes at least one of the following beneficial effects:

[0024] 1. By adding a reasonably proportioned synergist, the tail gas from methane distillation is prepared into a high-energy cutting gas, making full use of the tail gas generated during the distillation of high-purity methane and reducing the waste of distillation tail gas resources. Furthermore, the high-energy cutting gas prepared by this method can replace the acetylene cutting gas in some cases in the existing technology, making it a cleaner, more economical, environmentally friendly, and safer cutting gas. Attached Figure Description

[0025] Figure 1 This is a process structure diagram of an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the mixing cabinet in the embodiments of this application;

[0027] Figure 3 This is a cross-sectional view of the air leakage detection device in the embodiments of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Gas transmission pipeline; 2. First buffer tank; 3. First compressor; 4. Proportioning cabinet; 5. Second buffer tank; 6. Second compressor; 7. Synergist storage tank; 8. Leakage detection device; 81. First cylinder; 82. Second cylinder; 83. Airbag; 9. Connecting pipe; 10. Abutting element; 101. Connecting ring; 102. Abutting ring; 103. Elastic element; 11. Ring edge; 12. Connecting cylinder; 13. Sealing ring. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] This application discloses an apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas. (Refer to...) Figure 1It includes a first buffer tank 2, a first compressor 3, a proportioning cabinet 4, a second buffer tank 5, and a second compressor 6, which are connected in sequence through a gas transmission pipeline 1. The proportioning cabinet 4 is connected to an synergist storage tank 7 through a feed pipeline. Valves, such as ball valves and butterfly valves, are installed on the gas transmission pipeline 1 to control the opening and closing of the gas transmission pipeline 1.

[0031] The synergist storage tank 7 is filled with synergist, which can be selected from substances such as 120# solvent oil, ethanol, methyl tert-butyl ether, tung oil, tert-butylferrocene, and sodium naphthenate. These substances have functions such as solubilizing, combustion aiding, polymerization inhibition, smoke suppression, explosion prevention, and shock resistance. The amount of synergist added is 0.3%-3% of the mass of the distillation tail gas. The combustion temperature of the distillation tail gas after mixing with the synergist can reach 3000-3500℃, which can be used as a high-energy cutting gas.

[0032] In a further embodiment, the first compressor 3 is selected from a diaphragm compressor, and the second compressor 6 is selected from a reciprocating piston compressor. The distillation tail gas is first fed into the first buffer tank 2, where the pressure of the high-purity methane distillation tail gas is 0.01 MPa. The outlet pressure of the first compressor 32 is 0.5-1 MPa, and the outlet pressure of the second compressor 6 is 13-20 MPa. The gas in the second buffer tank 5 can be filled after being sent out by the second compressor 6.

[0033] In a further embodiment, refer to Figures and Figure 3 Both the mixing cabinet 4 and the gas pipeline 1 are equipped with a leak detection device 8. When a leak occurs at the connection between the gas pipeline 1 and the mixing cabinet 4, it can be detected and repaired in a timely manner.

[0034] A connecting pipe 9 is installed on the side wall of the mixing cabinet 4, which is used to connect to the gas supply pipe 1. A leak detection device 8 is installed at the connection between the connecting pipe 9 and the gas supply pipe 1. The leak detection device 8 includes a first cylinder 81 slidably installed on the outer wall of the connecting pipe 9, a second cylinder 82 slidably connected to the outer wall of the gas supply pipe 1, and an airbag 83 installed on the outer wall of either the first cylinder 81 or the second cylinder 82. The airbag 83 can be a balloon or similar device. In this embodiment, the airbag 83 is installed on the second cylinder 82 and communicates with the inner cavity of the second cylinder 82. After the connecting pipe 9 and the gas supply pipe 1 are connected, the first cylinder 81 and the second cylinder 82 are connected, and the connection point between the connecting pipe 9 and the gas supply pipe 1 is located within the inner cavity enclosed by the first cylinder 81 and the second cylinder 82. When a leak occurs at the connection point, the airbag 83 inflates, allowing personnel to promptly determine the leak situation.

[0035] Furthermore, an annular flange 11 is fixed to the outer wall of the first cylindrical body 81, and a connecting cylinder 12 is slidably mounted thereon. The opening of the connecting cylinder 12 faces the second cylindrical body 82, and the annular flange 11 can abut against the inner end face of the connecting cylinder 12. One end of the connecting cylinder 12 can be threaded to the outer wall of the second cylindrical body 82, thereby connecting the first cylindrical body 81 and the second cylindrical body 82 together, and the end faces of the first cylindrical body 81 and the second cylindrical body 82 abut against each other. An elastic layer of rubber material is bonded to the end face of the first cylindrical body 81 or the end face of the second cylindrical body 82, thereby improving the sealing performance at the abutment.

[0036] Both the outer wall of the gas pipeline 1 and the outer wall of the connecting pipe 9 are provided with abutment members 10. The abutment member 10 includes a connecting ring 101, an abutment ring 102, and an elastic member 103 connected between the connecting ring 101 and the abutment ring 102. The connecting ring 101 is fixed to the outer wall of the connecting pipe 9 and the gas pipeline 1, and the abutment ring 102 slides on the outer wall of the connecting pipe 9 and the gas pipeline 1. The elastic member 103 is a spring and is connected between the abutment ring 102 and the connecting ring 101. When the first cylinder 81 and the second cylinder 82 are connected, the abutment ring 102 can press against the inner wall of the first cylinder 81 or the second cylinder 82, and the elastic member 103 is compressed. This improves the sealing performance between the first cylinder 81 and the connecting pipe 9, and between the second cylinder 82 and the gas pipeline 1 through the abutment ring 102. A sealing ring 13 is fixed on the side of the contact ring 102 away from the connecting ring 101. The sealing ring 13 further improves the sealing performance of the space between the first cylinder 81 and the second cylinder 82.

[0037] The implementation principle of the apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to an embodiment of this application is as follows: The working process is as follows: the distillation tail gas enters the first buffer tank 2 at a predetermined flow rate, at which time the pressure of the distillation tail gas is 0.01 MPa. Subsequently, the tail gas is pressurized by the first compressor 3 and sent to the mixing tank 4. In the mixing tank 4, the synergist / distillation tail gas is added at a mass ratio of 0.7%. After the synergist and distillation tail gas are fully mixed and homogeneous, they are sent to the second buffer tank 5. Subsequently, the mixed gas is pressurized by the second compressor 6, and the pressurized gas is sent to the cylinder for filling.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas, characterized in that: It includes a first buffer tank (2), a first compressor (3), a mixing cabinet (4), a second buffer tank (5), and a second compressor (6) connected in sequence through a gas transmission pipeline (1). The mixing cabinet (4) is connected to an synergist storage tank (7) through a feed pipe. A leak detection device (8) is provided at the connection between the mixing cabinet (4) and the gas transmission pipeline (1).

2. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 1, characterized in that: The first compressor (3) is a diaphragm compressor, and the second compressor (6) is a reciprocating piston compressor.

3. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 2, characterized in that: The side wall of the mixing cabinet (4) is provided with a connecting pipe (9) for connecting to the gas pipeline (1). The gas leakage detection device (8) includes a first cylinder (81) connected to the connecting pipe (9), a second cylinder (82) connected to the gas pipeline (1), and an airbag (83) connected to the side wall of the first cylinder (81) or the second cylinder (82). The first cylinder (81) and the second cylinder (82) can be connected to each other, and the connection between the connecting pipe (9) and the gas pipeline is located in the space enclosed by the first cylinder (81) and the second cylinder (82).

4. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 3, characterized in that: The outer wall of the gas supply pipe and the outer wall of the connecting pipe (9) are both provided with abutment (10). The first cylinder (81) slides on the outer wall of the connecting pipe (9), and the second cylinder (82) slides on the outer wall of the gas supply pipe. The ends of the first cylinder (81) and the second cylinder (82) that are close to each other are connected, and the abutment (10) abuts against the inner wall of the adjacent first cylinder (81) or second cylinder (82).

5. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 4, characterized in that: The outer wall of the first cylinder (81) is provided with an annular edge (11), and a connecting cylinder (12) is slidably provided on the outer wall of the first cylinder (81). The annular edge (11) can abut against the inner end face of the connecting cylinder (12), and one end of the connecting cylinder (12) can be threaded to the side wall of the second cylinder (82).

6. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 5, characterized in that: The abutment (10) includes a connecting ring (101) disposed on the side wall of the connecting pipe (9) and the gas pipeline (1), and an abutment (102) connected to the connecting ring (101). An elastic element (103) is disposed between the connecting ring (101) and the abutment (102). When the first cylinder (81) and the second cylinder (82) are connected, the elastic element (103) drives the abutment (102) to press against the inner end face of the first cylinder (81) and the second cylinder (82).

7. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 6, characterized in that: A sealing ring (13) is provided on the side of the contact ring (102) away from the connecting ring (101).

8. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 7, characterized in that: The elastic element (103) is a spring, and the spring is connected between the abutment ring (102) and the connecting ring (101).

9. The apparatus for preparing high-energy cutting gas using high-purity methane distillation tail gas according to claim 8, characterized in that: An elastic layer is provided on the end face of the first cylinder (81) or the second cylinder (82).

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