A mixed gas preparation device and process for cutting and welding

Abstract

The present invention discloses a mixed gas preparation device and process for cutting and welding, the mixed gas preparation device includes an air inlet pipe, a mixing chamber, a primary filter plate, an air outlet pipe, a shell, and a nozzle; the liquefied natural gas is gasified by a gasifier and then processed by a mixed gas preparation device and then output to the cutting and welding equipment, the mixed gas preparation device has buffering, purification, and energy-enhancing mixing functions. The gas prepared by the present invention can change the frequency and wavelength of the flame in the combustion state, activate the main medium to burn instantly, release higher heat energy, and at the same time improve the transfer of effective heat to the acting object, and inhibit the radiation of the flame to the surrounding air; the flame temperature can reach more than 3400℃, and at the same time make the cutting line flame thinner and longer, faster, and the steel plate cutting thickness on land can reach more than 500mm, and underwater cutting and disassembly operations can be performed.

Description

Technical Field

[0001] The invention relates to cutting and welding equipment, and in particular to a mixed gas preparation device and process for cutting and welding. Background Art

[0002] Acetylene is produced by the chemical reaction of calcium carbide and water, and the products are calcium hydroxide and acetylene. However, since calcium carbide contains a certain amount of impurities during the production process, acetylene contains impurity gases, and the acetylene gas produced in this way is often toxic. Solid waste also contains toxic impurities, which cannot be removed, so these wastes will pollute the environment no matter how they are treated. The production process of calcium carbide is as follows: calcium carbonate ore is calcined at high temperature to generate calcium oxide, and then calcium oxide reacts with carbon at high temperature to generate calcium carbide (i.e., calcium carbide). It can be seen that in order to obtain acetylene, calcium carbonate ore must be available, and mines must be mined, and then a large amount of energy must be consumed to obtain calcium carbide for producing acetylene. In this process, mining will inevitably damage the ecological environment. Most of the energy used in the production process of calcium carbide in my country is coal, so a large amount of carbon dioxide and toxic gases will be generated in the production process, polluting the environment. The acetylene produced in this way has a high impurity content, is toxic, and produces serious secondary pollution. It is a gas that is neither environmentally friendly nor safe, and has a high cost.

[0003] Propane is a petrochemical product, but it is slightly toxic and harmful to human body. Propane will cause slag, low efficiency, flashback and great safety hazard when cutting. It is not easy to gasify below 7℃ and freezes below 0℃, which seriously affects the use and increases labor cost. Summary of the invention

[0004] The purpose of the present invention is to provide a mixed gas preparation device and process for cutting and welding in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] The present invention provides a mixed gas preparation device for cutting and welding, comprising an air inlet pipe, a mixing chamber, a primary filter plate, an air outlet pipe, an outer shell, and a nozzle. The air inlet of the air inlet pipe is connected to the outlet of a liquefied natural gas bottle, the exhaust port of the air inlet pipe is connected to the nozzle, the nozzle is located at the bottom of the mixing chamber, the bottom of the mixing chamber is filled with an energizer, the primary filter plate is arranged above the nozzle in the mixing chamber, the air outlet pipe is arranged at the upper end of the mixing chamber, and the air inlet pipe, the mixing chamber and the air outlet pipe are located in the outer shell.

[0007] As an improvement, valves and gas one-way valves are provided on the pipelines of the air inlet pipe and the air outlet pipe.

[0008] As an improvement, a filtering device is further provided in the mixing chamber above the primary filtering plate.

[0009] Specifically, the filtering device is composed of a secondary filter screen, a filter screen, a bottom plate, a fixing frame and a partition. The bottom plate is located above the primary filter plate. A through hole is provided in the middle of the bottom plate. The secondary filter screen is located above the bottom plate. There are multiple partitions, and the multiple partitions are staggered between the secondary filter screen and the bottom plate. The filter screen is filled between the staggered partitions, and the partition is fixed to the mixing bin through the fixing frame.

[0010] As an improvement, the lower end of the mixing bin is connected to a liquid storage bin via a pipeline, the upper end of the liquid storage bin is connected to the lower section of the mixing bin via a pipeline, and the upper end of the liquid storage bin is connected to the upper section of the mixing bin via a return pipe.

[0011] As an improvement, a liquid one-way valve is provided on the pipeline of the liquid return pipe.

[0012] The invention discloses a mixed gas preparation process for cutting and welding, wherein liquefied natural gas is gasified by a gasifier and then processed by a mixed gas preparation device and then output to cutting and welding equipment, wherein the mixed gas preparation device has buffering, purification, energy enhancement and mixing functions.

[0013] The specific method is: liquefied natural gas is added to the LNG cylinder through a liquid filling machine, the LNG cylinder is connected to the vaporizer through a pipeline, the liquefied natural gas is vaporized into natural gas through the vaporizer, and then enters the mixed gas preparation device, the natural gas is purified, filtered, and mixed with the energizer in the mixed gas preparation device to form a high-energy gas, and after the high-energy gas is decompressed, it can be used after being combined with oxygen through cutting and welding equipment.

[0014] The beneficial effects of the present invention are:

[0015] The present invention is a mixed gas preparation device and process for cutting and welding. Compared with the prior art, the present invention can change the frequency and wavelength of the flame in the combustion state by cooperating with a special cutting tip, welding tip, baking tip, gun and oxygen, activate the instantaneous combustion of the main medium, release higher heat energy, and at the same time improve the transfer of effective heat to the object, inhibit the radiation of the flame to the surrounding air; the flame temperature can reach above 3400℃ (tungsten rod can be melted), and at the same time make the cutting line flame thinner and longer, faster, the thickness of steel plate cutting on land can reach above 500mm, and underwater cutting and disassembly operations can be performed. During cutting, welding, punching, baking, quenching and other operations, due to the high flame temperature, fast cutting speed, smooth and flat working surface, fine cutting seam, smoothness of "flower 25" or more, less material loss, no tempering, no black smoke, no impurities, no condensation and ice at low temperature, the effect is more obvious when applied to the north. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] like Figure 1 As shown: A mixed gas preparation device for cutting and welding of the present invention comprises an air inlet pipe 2, a mixing chamber 4, a primary filter plate 8, an air outlet pipe 9, a shell 10, and a nozzle 16. The air inlet of the air inlet pipe 2 is connected to the outlet of a liquefied natural gas bottle, and the exhaust port of the air inlet pipe 2 is connected to the nozzle 16. The nozzle 16 is located at the bottom of the mixing chamber 4. The bottom of the mixing chamber 4 is filled with an energizer. The primary filter plate 8 is arranged above the nozzle 16 in the mixing chamber 4. The air outlet pipe 9 is arranged at the upper end of the mixing chamber 4. The air inlet pipe 2, the mixing chamber 4 and the air outlet pipe 9 are located in the shell 10.

[0019] As an improvement, a valve 1 and a gas one-way valve 3 are provided on the air inlet pipe 2 and the air outlet pipe 9 .

[0020] As an improvement, a filtering device is further provided in the mixing chamber 4 above the primary filtering plate 8 .

[0021] Specifically, the filtering device is composed of a secondary filter screen 5, a filter screen 6, a bottom plate 7, a fixing frame 11 and a partition 12. The bottom plate 7 is located above the primary filter plate 8. A through hole is provided in the middle of the bottom plate 7. The secondary filter screen 5 is located above the bottom plate 7. There are multiple partitions 12, and the multiple partitions 12 are staggered between the secondary filter screen 5 and the bottom plate 7. The filter screen 6 is filled between the staggered partitions 12, and the partitions 12 are fixed to the mixing bin 4 through the fixing frame 11.

[0022] As an improvement, the lower end of the mixing bin 4 is connected to a liquid storage bin 15 via a pipeline, the upper end of the liquid storage bin 15 is connected to the lower section of the mixing bin 4 via a pipeline, and the upper end of the liquid storage bin 15 is connected to the upper section of the mixing bin 4 via a return pipe 13.

[0023] As an improvement, a liquid one-way valve 14 is provided on the liquid return pipe 13 .

[0024] The natural gas enters the mixing chamber through the air inlet pipe, and is sprayed into the energizer from the nozzle to mix with the energizer for the first time. The natural gas rushing into the energizer will cause the energizer at the bottom of the mixing chamber to boil, and a large amount of gas-liquid mixture will move upward from the bottom. After being filtered by the primary filter plate, part of the liquid in the gas-liquid mixture is blocked and flows back to the bottom. The other part still moves upward with the natural gas. This part of the gas-liquid mixture enters the filter screen through the hole in the middle of the bottom plate 7. Because the filter screen is divided into two parts by the partition, the contact area between the natural gas and the energizer is increased, and the contact time is prolonged, and the mixing is more complete.

[0025] After mixing is completed, the gas enters the top of the mixing chamber and is then output to the gas-using end through the gas outlet pipe.

[0026] The invention discloses a mixed gas preparation process for cutting and welding, wherein liquefied natural gas is gasified by a gasifier and then processed by a mixed gas preparation device and then output to cutting and welding equipment, wherein the mixed gas preparation device has buffering, purification, energy enhancement and mixing functions.

[0027] The specific method is: liquefied natural gas is added to the LNG cylinder through a liquid filling machine, the LNG cylinder is connected to the vaporizer through a pipeline, the liquefied natural gas is vaporized into natural gas through the vaporizer, and then enters the mixed gas preparation device, the natural gas is purified, filtered, and mixed with the energizer in the mixed gas preparation device to form a high-energy gas, and after the high-energy gas is decompressed, it can be used after being combined with oxygen through cutting and welding equipment.

[0028] The methane energizer is added to LNG and CNG in a certain proportion by natural control quantitative method. After the foam in the patented molecular chamber naturally floats, it overflows into the molecular association chamber with compressed natural gas or compressed liquefied natural gas for sufficient molecular saturated association movement. The molecules collide violently with the energizer in the association chamber, open the high-energy molecular chain, and fully fuse. Due to the violent molecular collision, the molecular association time can reach microseconds, and the association is completed instantly. The upper part of the association chamber is an arc-shaped structure, which can generate scattering when the molecules at the bottom move upward and collide with the top and then rebound, so that the high-energy molecules can be mixed more evenly. Finally, a new type of clean high-energy methane (VPGCH4) is obtained.

[0029] This process uses natural gas (CH4) as the main raw material, and its safety is compared with acetylene and propane gas.

[0030]

[0031] After acetylene leaks, it is easy to remain suspended in the air and cause a fire because its specific gravity is similar to that of air. At the same time, because its explosion limit range is very wide and it is easy to backfire, it is very easy to cause explosions and other safety accidents.

[0032] After propane leaks, because its specific gravity is 1.5 times heavier than air, it all stays in the bottom layer of the air. Once it encounters a spark, it will cause a large area of ​​fire and lead to an explosion.

[0033] Methane is lighter than air, only half the weight of air, so it will evaporate quickly into the air after leaking, and it is extremely difficult to reach the percentage required for the explosion limit. It will not backfire, so it is the safest.

[0034] The cost of the gas generated by this process is compared with that of acetylene and propane gases: taking the exhaustion of one bottle of VPGCH4 as a reference: when one bottle of VPGCH4 is exhausted, a total of 22 sets of powder silo connecting plates are unloaded; therefore, 22 sets of acetylene and propane are also unloaded for comparison.

[0035] Direct comparison with the same workload:

[0036]

[0037] Comparison of direct and indirect costs of this process gas with acetylene and propane gas

[0038]

[0039] Oxygen capacity:

[0040] When one bottle of acetylene (actual weight 2.2KG) is used up, there are 3 bottles of oxygen;

[0041] When one bottle of propane (actual weight 15KG) is used up, there are 15 bottles of oxygen;

[0042] When one bottle of VPGCH4 (actual weight 4.6KG) is used up, there are 20 bottles of oxygen.

[0043] (III) Strong adaptability

[0044] Because natural gas has a low critical temperature and is extremely difficult to liquefy, it can be used in any climate.

[0045] When the gas is burning, it can change the frequency and wavelength of the flame, activate the instantaneous combustion of the main medium, release higher heat energy, and at the same time improve the transfer of effective heat to the object, inhibiting the radiation of the flame to the surrounding air; the flame temperature can reach above 3400℃ (can melt tungsten rods), and at the same time make the cutting line flame thinner and longer, faster, and the thickness of steel plate cutting on land can reach more than 500mm, and it can also be used for underwater cutting and disassembly operations. During cutting, welding, punching, baking, quenching and other operations, due to the high flame temperature, fast cutting speed, smooth and flat working surface, fine cutting seam, smoothness of "flower 25" or more, less material loss, no tempering, no black smoke, no impurities, no condensation and ice at low temperature, it is particularly effective in the north. This gas can completely replace and surpass propane and acetylene [unit cost is less than 3 times that of propane and 5 times that of acetylene].

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A mixed gas preparation device for cutting and welding, characterized in that: The invention comprises an air inlet pipe (2), a mixing chamber (4), a primary filter plate (8), an air outlet pipe (9), a shell (10), and a nozzle (16); the air inlet of the air inlet pipe (2) is connected to the outlet of a liquefied natural gas bottle, the air outlet of the air inlet pipe (2) is connected to the nozzle (16), the nozzle (16) is located at the bottom of the mixing chamber (4), the bottom of the mixing chamber (4) is filled with an energizer, the primary filter plate (8) is arranged above the nozzle (16) in the mixing chamber (4), the air outlet pipe (9) is arranged at the upper end of the mixing chamber (4), the air inlet pipe (2), the mixing chamber (4) and the air outlet pipe (9) are located in the shell (10); valves (1) and gas one-way valves (3) are arranged on the air inlet pipe (2) and the air outlet pipe (9); a filtering device is also arranged above the primary filter plate (8) in the mixing chamber (4); the filtering device The invention comprises a secondary filter screen (5), a filter screen (6), a bottom plate (7), a fixing frame (11) and a partition plate (12), wherein the bottom plate (7) is located above the primary filter plate (8), a through hole is provided in the middle of the bottom plate (7), the secondary filter screen (5) is located above the bottom plate (7), a plurality of partition plates (12) are arranged alternately between the secondary filter screen (5) and the bottom plate (7), and the filter screen (6) is provided on the bottom plate (7). (6) is filled between the mutually staggered partitions (12), and the partitions (12) are fixed to the mixing chamber (4) through the fixing frame (11); the lower end of the mixing chamber (4) is connected to a liquid storage chamber (15) through a pipeline, the upper end of the liquid storage chamber (15) is connected to the lower section of the mixing chamber (4) through a pipeline, and the upper end of the liquid storage chamber (15) is connected to the upper section of the mixing chamber (4) through a return pipe (13).

2. The device for preparing mixed gas for cutting and welding according to claim 1, characterized in that: A liquid one-way valve (14) is provided on the liquid return pipe (13).

3. A process for preparing mixed gas for cutting and welding, characterized in that: The mixed gas preparation device for cutting and welding described in any one of claims 1-2 is used for preparation, and the specific method is: liquefied natural gas is added to the LNG cylinder through a liquid filling machine, the LNG cylinder is connected to the vaporizer through a pipeline, the liquefied natural gas is vaporized into natural gas through the vaporizer, and then enters the mixed gas preparation device, the natural gas is purified, filtered, and mixed with an energizer in the mixed gas preparation device to form a high-energy gas, and the high-energy gas can be used after being reduced in pressure and combined with oxygen through cutting and welding equipment; the liquefied natural gas is gasified through a vaporizer and then processed by a mixed gas preparation device and then output to the cutting and welding equipment, and the mixed gas preparation device has buffering, purification, energizing and mixing functions.

Images