JPS61136592A - Three-component gas mixture supply device - Google Patents

Abstract

PURPOSE:To safely supply a uniform-quality, three-component gas mixture obtd. by mixing acetylene, hydrogen and a hydrocarbon which belongs to an LP component or is a natural gas-base hydrocarbon. CONSTITUTION:Acetylene sent from an acetylene source 1 through a pipe line 15 filled with a filler such as a fine tube of a diameter <=12.5mm, or an iron or ceramic Raschig ring of a diameter and a length each <=25mm so as not to form a void space of a diameter >=11.5mm, is homogeneously mixed in a mixer 10 with hydrogen gas and hydrocarbon respectively sent from a hydrogen source 2 and a hydrocarbon source 3 through pipe lines 16 and 17, to prepare a gas mixture, which is stored through a pipeline 18 filled with said filler in a buffering control tank 11 filled with a similar filler. Pressure of the gas to be used is kept uniform independently of the amt. of operation such as welding or fusing by many terminal torch tubes 22 attached to a connection 21, by adjusting the pressure of a gas in the pipe line 19 sent from the control tank 11 by a gas mixture flow control valve 13 and a pressure control valve 14, and sending the gas to a manifold 20.

Description

[Detailed description of the invention] [Industrial field of application] The present invention provides acetylene-hydrogen-L used for welding, melting, etc.
This invention relates to an apparatus for producing and supplying a ternary mixed gas obtained by mixing hydrocarbons belonging to the P gas component or natural gas. More specifically, when supplying the above-mentioned mixed gas to a branch pipe with a large number of soft pipes at the end, it is possible to cope with wide changes in the supply amount load due to fluctuations in the operating rate, and to safely handle gases with high risks such as explosions. The present invention relates to a supply device for a three-component mixed gas that can be used for welding, cutting, etc.

[Conventional technology]

j The present inventors previously discovered that (A) acetylene gas of 2 to 85 mol, hydrocarbons belonging to the LP gas component of 10 to 50 mol, and hydrogen gas of 5 to 0 mol, as a mixed gas suitable for applications such as welding and melting. The total of each gas within the range is 100
%, and applied for a patent. (Patent Application No. 203976, filed in 1982)
No. A) In addition, fuel gases suitable for applications such as welding and melting are (B) natural gas-based hydrocarbons in the range of 20 to 70 molt, hydrogen gas 10-60, tylene gas 20 ref, 0 molt. He also developed a three-part gas mixture characterized by a mixture of 100% gas, and applied for a patent for the same. (Patent Application No. 161584, 1981, B)
When these mixed gases are used by large users such as shipyards that have a large number of end soft pipes, a large amount of gas is consumed in welding and cutting operations using a large number of end soft pipes at once. In some cases, a relatively small number of end soft pipes are used to reduce gas consumption, and when working with branch pipes from a single gas source, the gas supply load is large. Although it is necessary to assume wide fluctuations in load, we have not found any suitable device that can handle such fluctuations in load.

[Problem that the invention seeks to solve]

In this type of mixed fuel, various physical properties change when the composition changes, and not only does a change in composition during work affect the finish of welding and fusing, which is undesirable, but also changes in composition over time can affect safety. There is also a growing fear that unforeseen circumstances will arise. There is a way to manage and operate relatively small mixing supply devices distributed here and there, but it is best to uniformize the conditions and handling of each device and manage it so that there are no problems in terms of quality or safety. In today's era of rationalization and competition, it is difficult to allocate personnel. Therefore, we would like to consolidate the mixed gas fuel supply equipment into a size that is suitable for use, and operate it under a thorough management system so that the gas has a uniform and easy-to-use quality and has a composition that does not pose any safety concerns in terms of disaster prevention. There was a strong hope in the consumer industry. In addition to the above-mentioned composition inventions of the patent applicant and B, the present inventors have also studied and researched the mixed supply device for these gases, conducted various experiments, made improvements, and completed the present invention. reached.

[Means for solving problems]

The present invention is directed to the use of hydrocarbons or natural gas-based hydrocarbons belonging to ``■ acetylene, (2) hydrogen, and ``f, P gas component (
This is a device that supplies a three-component mixed gas obtained by mixing a three-component mixed gas (collectively referred to as hydrocarbons) to a branch pipe for use in applications such as welding and melting, and includes an acetylene source, a hydrogen source, and a hydrocarbon. The pipes connected to each of the gas sources are connected to a gas mixer via a source gas on-off valve and one constant flow valve that control the amount of gas supplied from each gas source, and the gas mixture is used to prepare the gas. The three-component mixed gas is stored in a buffer adjustment tank (surge tank) filled with a capillary tube with a diameter of 12.5 mm or less, an iron or ceramic Raschig ring with a diameter and length of 25 mm or less, or a similar filling. ) and a pipe to supply the branch pipe via a mixed gas flow control valve, and the mixed gas flow control valve measures the gas pressure in the pipe between the above-mentioned adjustment tank and the branch pipe, and adjusts the gas pressure to the branch pipe. The source gas on-off valve measures the gas pressure in the adjustment tank and operates in response to this gas pressure iζ. , installed so as to be able to control the supply amount of each source gas from the acetylene source, hydrogen source, and hydrocarbon source to the mixer together with a flow rate control valve that adjusts according to the mixing ratio of each gas, and each of the above gases. Inside the piping The inside of the piping that passes acetylene and gas containing acetylene has a diameter of 1 1.
．． A three-component mixed gas supply device characterized in that it is filled with the above-mentioned thin tubes, Raschig rings, and other fillers as appropriate so as not to create a gap of 5 m or more. ”.

The configuration of this device is schematically shown in FIG. In the figure, raw material gas is passed from an acetylene source 1, a water IA source 2, and a hydrocarbon source 3 to a gas mixer 10 through a raw gas on-off valve 4.5.6 and a flow rate control valve 7.8.9, respectively. Inside, the three components are mixed uniformly to form a mixed gas, and this gas is l! The mixed gas is stored in a city adjustment tank (surge tank) 11, and the terminal soft pipe 22 is connected to the connection port 2 according to the opening and closing of the mixed gas flow rate adjustment valve 13.
It flows toward the branch pipe 20 connected at 1.

The number of terminal soft pipes 22 connected to the connection port 21 and used for welding, melting, etc. depends on the operating rate depending on various factors such as day/night, work/rest time, weather, season, economic trends, etc. It increases or decreases significantly due to fluctuations. If the composition and pressure of the three-component mixed gas in the soft end tube 22 fluctuate over time, this will have a negative effect on the finish of welding and fusing, so in the apparatus of the present invention,
Gas is stored in the buffer adjustment tank 11, and then the branch pipe 20
A pressure regulator 14 is provided in a nearby pipe 19, and a mixed gas flow rate control valve 13 is operated to maintain the pressure of the mixed gas flowing in the pipe 19 at a constant set pressure.

On the other hand, a pressure regulator 12 is also provided in the buffer adjustment tank 11, and the raw gas on-off valve 4.5.6 is operated to maintain the mixed gas pressure in the buffer adjustment tank 11 within a certain set pressure range. let

In order to maintain the composition of the mixed gas at a fixed ratio,
A flow rate control valve 7.8.9 is provided in each raw material gas pipe flowing from each raw material gas source 1.2.3 via a raw gas on/off valve. It is also possible to provide a control device that analyzes the composition of the mixed gas and finely adjusts each flow rate control valve based on the analysis result.

Inside the piping that passes acetylene or a gas containing acetylene and inside the buffer adjustment tank (surge tank) 11, there is a diameter 11.
Fill the tube with a filler similar to a thin tube with a diameter of 12.5 mm or less, an iron or ceramic Raschig ring with a diameter and length of 25 mm or less, or the like, so as not to create a void of 5 wg or more. This means that no voids are left in order to avoid the risk of explosion due to decomposition of acetylene.

In the apparatus shown in FIG. 1, when a large number of terminal soft pipes 22 are attached to the connection port 21 provided in the branch pipe 2o and a mixed gas is actively used for welding, melting, etc., the gas flows inside the pipe 19. Since the pressure of the gas decreases, the pressure regulator 14 that detects this immediately opens the mixed gas flow rate control valve 13, and when the pressure in the pipe 19 recovers, the pressure regulator 14 that detects this decreases. Working, mixed gas flow rate - 4 wells 1
3 in the closing direction. Similarly, buffer adjustment tank 1
Regarding fluctuations in the pressure of the mixed gas in step 1, the pressure regulator 12 detects the fluctuations in pressure and switches the raw material gas on/off valve 4.5.6.
is activated, and together with the action of the flow rate control valve 7.8.9, the mixed gas having a predetermined composition is stored in the buffer adjustment tank 11 under a pressure within a predetermined range, and is used. Even if the gas load varies, the flame of the mixed gas for welding and fusing does not vary.

The gas mixer 10 may be of any type as long as it can mix the components uniformly and efficiently, and any commercially available type may be used. However, since acetylene is used, it is necessary to avoid using materials that would produce gold-pure acetylide upon contact with acetylene. Piping, buffer adjustment tank, gas cylinder, pressure reducing valve,
The same is true for the soft tube at the end, etc., in that materials that have a tendency to produce metal acetylides must not be used.

[For production]

The three-component mixed gas supply device of the present invention includes: (1) acetylene, (
2) When installing a three-component mixed gas obtained by mixing hydrogen and hydrocarbons in a branch pipe for use in welding, cutting, etc., in a branch pipe that has a large number of soft pipes at the end, Even if the supply rate fluctuates significantly over time due to fluctuations in the operating rate, the composition and pressure of the gas mixture at the end of the soft tube will not change, and therefore the flame number generated in the soft tube will not change substantially. Since no fluctuation occurs, it is possible to avoid the effect of fluctuations in the supply amount on the finish of welding/fusion cutting. Furthermore, this invention can prevent explosions of dangerous gases, enables safe handling, and makes large-scale welding and fusing operations extremely convenient.

〔Example〕

Example 1 As a hydrogen source, 7. Hydrogen gas (sold by Taiyo Sanso Co., Ltd.) stored in a collecting device for 20 cylinders with a door, and dissolved acetylene (sold by Taiyo Sanso Co., Ltd.) stored in a collecting device for 30 7 to 9 cylinders as an acetylene source. The hydrocarbon source used was liquefied propane (sold by Taiyo Sanso Co., Ltd.), which was collected from five 50ks cylinders and stored in an LPG supply device equipped with a hot water heating vaporizer, as shown in Figure 1. A three-component mixed gas supply system was installed. Gas mixer, stainless steel (Jxs, 5US304)
The so-called static mixer JN-60 (manufactured by Noritake Company, outer diameter 27.2 cx length 205 a)
ll) was used. As a buffer adjustment tank, the total internal volume is 2
A 00L stainless steel (5US304) tank filled with porcelain Raschig rings with an outer diameter of 20 mm, an inner diameter of 16 mm, and a length of 20 m is used to hold up to 100 end soft pipes for welding and fusing. Branch piping made of carbon steel pipe for pressure piping (JIS G3454) and rolled steel material for membrane structure (JIS G 3101, symbol 55) so that it can be increased or decreased.
41) was provided with a connection port.

After replacing the air in the three-component mixed gas supply device with nitrogen, 60 volumes of acetylene, 20 volumes of hydrogen, and 2 volumes of propane were added.
The flow rate control valve 7 is set so that a gas with a mixing ratio of 0 volume is obtained.
．． Adjust the pressure in the buffer adjustment tank to an upper limit of 2.0 to 8.9.
, the pressure regulator 12 was adjusted so that the lower limit was within the range of 15 intensities.

First, 100 terminal soft pipes were connected to all the connection ports provided in the branch piping. In order to replace nitrogen in the system with acetylene-hydrogen-propane ternary mixed gas, source gas on-off valves 4, 5, and 6 are activated (purge nitrogen gas from the soft pipe at the end of the branch piping). All 100 terminal soft tubes were ignited, the maximum load was applied, the flow rate of the mixed gas was measured, and the composition of the mixed gas, that is, the concentration of each component of acetylene, hydrogen, and propane, was It was measured.

Next, the gas flow rate and gas concentration were measured in the same manner when the number of terminal soft tubes during ignition was successively reduced to 50, 10, and 1. Next, the number of terminal soft tubes being ignited was increased again to 10, 50, and 100, and it was confirmed that the device operated stably and safely. These measurements,
The analytical values are shown in Table 1.

The flow rates and component gas concentrations of each mixed gas in Table 1 are values measured 5 minutes after the end of switching the number of terminal soft tube ignitions.

The component gas concentration was analyzed by a gas chromatograph (GC-7APTF, thermal conductivity type, manufactured by Shimadzu Corporation). For acetylene and LP gas-based or natural gas-based hydrocarbons, helium was used as a carrier gas, and for hydrogen, argon was used as a carrier gas.

Example 2 In place of propane, which is a hydrocarbon belonging to the LP gas component used in Example 1, a natural gas-based hydrocarbon was used. Specifically, as a natural gas-based hydrocarbon source, methane gas stored in a collection device of three 777 cylinders filled with methane gas (sold by Taiyo Sanso Co., Ltd., methane content 9
9% or more), the composition of the three-component mixed gas was set to 40% by volume of acetylene, 30% by volume of hydrogen, and 30% by volume of methane.
Perform gas replacement and ignition in the same manner as in
Table 2 shows the results of measuring the mixed gas flow rate and gas concentration when the mixed gas was ignited at the end soft tube.

The mixed gas flow rate and component gas concentration were measured 5 minutes after the end of switching the number of terminal soft tube ignitions, and the analysis method was the same as described in Example 1.

Table 2 In both Example 1 and Example 2, there were no safety concerns found during the experiment.
Even though the temperature was varied greatly within the range of 100, there were no major changes in the gas composition, the appearance of large smoke, etc., and no disadvantages were observed when used for either welding or fusing.

〔Effect of the invention〕

As mentioned above, according to the present invention, ■ acetylene, (2
) A three-component mixed gas obtained by mixing hydrogen and hydrocarbons is supplied to branch piping for use in applications such as welding and melting, and is used to improve operating efficiency in branch piping that has a large number of soft pipes at the end. Even if there is a large fluctuation in the gas supply needle due to temporal fluctuations, the composition and pressure of the mixed gas at the end soft tube 1 will not change.
Since there is virtually no variation, and the gas smoke generated at the nozzle can be of uniform quality, welding and fusing operations are extremely easy, and it is easier to ensure a consistent finish.

Another excellent feature is that mixed gases can be handled safely.

Welding and cutting gas supplies are consolidated (1), making it easier to maintain uniform quality both on the work surface and in terms of safety.
The practical contribution to industry is significant.

[Brief explanation of drawings]

FIG. 1 is a schematic flow sheet of an example of the apparatus of the present invention. 1... Acetylene source, 2... Hydrogen source, 3... Hydrocarbon source, 4.5.6... Raw material gas on-off valve, 7.
8.9...Flow control valve, 10...Gas mixer,
11...Buffer adjustment tank, 12...Pressure regulator, 1
3...Mixed gas flow rate control valve, 14...Pressure regulator, 15.16.17.18.19...Piping, 20.
... Branch pipe, 21 ... Connection port, 22 ... End soft pipe.

Claims (1)

[Claims] A three-component mixed gas obtained by mixing (1) acetylene, (2) hydrogen, and (3) hydrocarbons belonging to the LP gas component or natural gas-based hydrocarbons (these are collectively referred to as hydrocarbons). This is a device that supplies branch piping for use in applications such as welding and melting, and the piping connected to each of the acetylene source, hydrogen source, and hydrocarbon source is controlled by the amount of gas supplied from each of these gas sources. The three-component mixed gas prepared by the mixer is connected to a gas mixer via a raw gas on-off valve and a flow rate control valve, and the three-component mixed gas prepared in this mixer is transferred to a thin tube with a diameter of 12.5 mm or less or an iron tube with a diameter and length of 25 mm or less. Alternatively, a buffer adjustment tank (surge tank) filled with a ceramic Raschig ring or a similar filling material and a pipe supplying the mixed gas flow rate to the branch pipe via a mixed gas flow rate control valve are provided to adjust the flow rate of the mixed gas. The valve is installed to measure the gas pressure in the pipe between the above-mentioned adjustment tank and the branch pipe, and operates in response to this gas pressure to control the supply amount of the three-component mixed gas from the above-mentioned adjustment tank. The source gas on-off valve operates according to the gas pressure measured in the adjustment tank, and operates together with the flow rate control valve that adjusts according to the mixing ratio of each gas, as well as the acetylene source and hydrogen source. The pipes are installed so as to be able to control the supply amount of each raw material gas from the hydrocarbon source to the mixer, and the pipes for passing acetylene and gas containing acetylene have a diameter of 11.5 m.
A three-component mixed gas supply device characterized in that it is suitably filled with the above-mentioned thin tubes, Raschig rings, and other fillers so as not to create voids of m or more.