JPS60144508A - Manufacture of high temperature gas - Google Patents

Abstract

PURPOSE:To manufacture the high temperature gas containing a small quantity of molecular oxygen content by a method wherein fuel is mixed with a part of burning gas introduced from a circulating process, the mixed fuel is distributed, introduced into plural burning chambers, then the mixed gas is burnt. CONSTITUTION:At the trouble a pot unit 112a, a valve 120a is closed under the continuous operating condition of a first burning chamber 101 and other pot units 112b, 112c...112e. Then the operation of second burning chambers 121a, 121a' and a pot 112a is stopped, thereafter, the trouble of the pot unit 112a can be repaired, also can be replaced by a new pot unit after removing a flange 122a. After the repair or replacement of the pot unit, the reoperation is started only by opening the valve 120a, the fuel gas is immediately introduced into the second chamber, then the burning is restarted. Thereby, the high temperature gas can be manufactured industrially and effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing hot gas. For more details, see non-oxidizing high temperature with low molecular oxygen content from air.
The present invention relates to a method of manufacturing a gas.

2- A non-oxidizing high-temperature gas with a low molecular oxygen content is used, for example, to prevent wear of a metal manifold with a large number of nozzle holes used in the production of glass molten glass fibers. Used as a high temperature gas required in manufacturing MIL fibers (U.S. Pat. No. 4,252)
6.478 and JP-A-56-68,706).

BACKGROUND ART Conventionally, it is known to produce a high-temperature gas with a low molecular oxygen content from air, as described in the above-mentioned US patents and published publications.

However, in the conventional method, a device in which a first combustion chamber and a second combustion chamber are paired is used as a device for producing high-temperature gas, so for example, some kind of trouble occurred in the second combustion chamber. If the operation of the first combustion chamber is forced to stop,
Therefore, there is also a drawback that restart of operation must be started from the first combustion chamber, and that it takes a long time to reach steady operation.

Furthermore, in the conventional method, it was necessary to provide a second combustion chamber for each of the first combustion chambers, which made it difficult to secure space and required various solutions, such as increasing equipment costs. It had the right points.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an industrially advantageous method for producing a high-temperature gas, particularly a high-temperature gas with a low molecular oxygen content.

Another object of the present invention is that it is easy to secure space for installing equipment for carrying out the method of the present invention, the cost of the equipment is low, and the method is relatively trouble-free because it burns a gas mixture with a low molecular oxygen content. To provide an industrially advantageous method and system for producing high-temperature gas, which eliminates the need to stop operation of a first combustion chamber even if a situation in which the operation of a second combustion chamber is forced to stop occurs. There is a particular thing.

Further objects and advantages of the present invention will become apparent from the description below.

These objects and advantages of the present invention are, according to the present invention: (1) burning a gaseous fuel or a gaseous mixture containing vaporized fuel and air in a first combustion chamber to produce a combustion gas containing molecular oxygen; (2) Lead out the combustion gas from the first combustion chamber; (3) Mix gaseous fuel or vaporizable fuel and air with a portion of the combustion gas to produce gaseous fuel or a gas containing vaporized fuel and air. 4) Introducing the gas mixture into the first combustion chamber, thus "1"
The steps (1) to (4) are circulated, and in (5') - the remainder of the combustion gas containing molecular oxygen from the step (2) is mixed with gaseous fuel or vaporizable fuel and, if necessary, air. ,
to prepare a gaseous fuel or a gas mixture containing vaporized fuel and molecular oxygen, (6) dividing the gas mixture and introducing it into a plurality of second combustion chambers, (7) individual second combustion This is achieved by a method for producing high-temperature gas, characterized in that the gas mixture is combusted indoors to generate combustion gas, and (8) the combustion gas in step (7) is taken out as high-temperature gas.

51 In the present invention, gaseous fuel is a combustible substance that is in a gaseous state at normal temperature and normal pressure. For example, butane, propane, city gas, methane, ethane, acetylene, etc. are preferably used as the gaseous fuel. Further, vaporized fuel is a fuel that is a combustible substance other than gaseous fuel but can be vaporized, for example, a fuel that is in the form of vaporized liquid fuel that is in a liquid state at normal temperature and normal pressure. As the vaporizable fuel, liquid fuels such as benzene, toluene, methanol, gasoline, kerosene, heavy oil, or mixtures thereof are preferably used.

The method of the present invention consists of a circulation process consisting of the four steps (1) to (4) above, and a part of the combustion gas derived from the circulation process mixed with fuel, which is divided and introduced into a plurality of combustion chambers. It basically consists of the steps (5) to (8) above, in which the gas is combusted to produce a high-temperature gas with a low molecular oxygen content.

The step (1) above is a combustion step of gaseous fuel or vaporized fuel containing air, which is carried out in the first m-th combustion chamber, and the combustion is carried out by molecular oxygen in the air. The term "vaporized fuel" refers to a fuel obtained by vaporizing the liquid fuel as described above. Such combustion chambers themselves are known in the art and can be used in the present invention. The combustion reaction advantageously proceeds in the presence of a catalyst. Examples of catalysts used include vanadium pentoxide, palladium, rhodium and platinum, which are also well known.

The mixing ratio of gaseous fuel or vaporized fuel and air is such that the molecular oxygen present in the air is sufficient to burn the fuel, and the proportion of fuel that can be mixed to the maximum extent is such that the molecular oxygen present in the air is sufficient to burn the fuel. can be easily determined from the theoretical amount of combustion oxygen or by conducting a simple experiment.

Theoretical combustion oxygen amount means the theoretical amount of oxygen required to convert carbon and hydrogen in the fuel into carbon dioxide and water, respectively. In order to reduce the molecular oxygen content contained in the resulting combustion gas as much as possible, it is generally recommended to reduce the amount of molecular oxygen contained in the resulting combustion gas by about 1% of the theoretical combustion oxygen amount of the fuel.
It is desirable to mix air with the fuel so that molecular oxygen is in excess of about 1.9%.

Thus, according to step (1) of the present invention, combustion gas containing molecular oxygen, although in a small amount, is generated in the first combustion chamber. The combustion gas preferably contains 1 to 17% by volume of molecular oxygen.

The combustion gas generated in the first combustion chamber is led out from the combustion chamber in step (2). The derived combustion gas is divided into two parts, a part of which is used in step (5) described later, and the other part is mixed with gaseous fuel or vaporizable fuel and air in step (3) to produce the fuel. is prepared into a gas mixture containing

It is desirable that the fuel gas discharged in step (2) is used in steps (3) and (5) at a high temperature without being cooled. For example, when using fuel that can be vaporized in step (3), the ratio of dividing the fuel bus into step (3) and step (5) is such that sufficient heat is given to vaporize the fuel. - be used in step (3) when Since the fuel derived in step (2) usually reaches a temperature of 500-700°C, about 50-60% by volume of it can be used for step (5) during combustion at such temperatures. .

The air used in step (3) is sufficient to combust the fuel used in step (3) and is determined as described above. The gas mixture prepared in step (3) is circulated to the first combustion chamber in step (4).

Thus, the implementation of steps (1) to (4) above constitutes a cyclic step in the method of the present invention.

According to the method of the present invention, the remainder of the combustion gas containing molecular oxygen from step (2) is mixed with gaseous fuel or vaporizable fuel and optionally air in step (5) to produce gaseous fuel or Provides a gas mixture containing vaporized fuel and molecular oxygen. The molecular oxygen in the gas mixture is either molecular oxygen contained in the combustion tube from step (2) to step (5) or used in step (5) with molecular oxygen. It comes from molecular oxygen in the air. Therefore, if the combustion gas from step (2) contains a large amount of molecular oxygen, it may not be necessary to mix air in step (5).

According to the method of the present invention, the gas mixture prepared in step (5) is divided in step (6) and introduced into a plurality of second combustion chambers, and in step (7) is divided into a plurality of second combustion chambers. producing combustion gases which are combusted and removed as hot gas in step (8).

As understood from the above, since a plurality of second combustion chambers are used in step (6) in contrast to the first combustion chamber in step (1), according to the present invention, the first combustion chamber is Even in equipment, the second combustion chamber can be made smaller, making it easier to secure space for installing the second combustion chamber, so the second combustion chamber is set up near equipment that uses high-temperature gas. even possible. In addition, by dividing the 10-gas mixture into a plurality of second combustion chambers in step (6) through piping equipped with valves independently provided for each second combustion chamber, the i12 combustion Even if an accident occurs that requires the operation of any of the chambers to be stopped, it is possible to continue operating the first combustion chamber and the FF52 combustion chamber in its pond, and to continue implementing the method of the present invention.

According to a preferred embodiment of the present invention, in step (5), before mixing the gaseous fuel or vaporizable fuel with the remainder of the combustion gas containing molecular oxygen from step (2), the combustion gas is It is mixed with a non-oxidizing inert gas such as nitrogen, steam, etc. Another preferred embodiment is the step (5) described in -.
In this method, before mixing the gaseous fuel or vaporizable fuel with the remainder of the combustion gas containing molecular oxygen from step (2), the fuel is mixed with a non-oxidizing inert gas in advance.

According to the preferred aspect of the present invention, the temperature of the high-temperature gas taken out from the second combustion chamber can be controlled, and combustion in the second combustion chamber can be performed smoothly.

The method of the present invention will be specifically explained below using FIG. 1 of the accompanying drawings. FIG. 1 shows a schematic flow diagram of a high temperature gas production system suitable for carrying out the method of the present invention.

A gaseous mixture including fuel and air is combusted in the first combustion chamber, producing combustion gas in the first combustion chamber. The combustion gases formed in the first combustion chamber 101 are led out through the pipe 102. A portion of the air is sent through a pipe 102' by an ejector 103 and from a compressor 104 through a valve 105 to be mixed with the air. A liquid fuel tank 106 is placed in the combustion gas diluted with air.
The liquid fuel sent from the pump 107 through the valve 108 is atomized and mixed by the atomizer 109. The obtained vaporized fuel containing air is passed through pipe 11
0 into the first m-th baking chamber 101. Thus t
Combustion takes place in the IS1 combustion chamber 101, and the above steps are repeated, while the combustion gases led out through the pipe 1 (12'') are sent through the valve 111,
It is mixed with the liquid fuel atomized by the atomizer 1 ( ) 9', and the fuel is mixed with the liquid fuel atomized by the atomizer 1 ( ) 9', and the fuel is mixed with the liquid fuel that is atomized by the atomizer 1 ( ) 9', and is then transferred to the plurality of second combustion chambers 121a-e and 12+a' to e.
’ will be introduced. 1 including each second combustion chamber in FIG.
One unit has a pair of second combustion chambers, for example 121a and 12
1. a' and bo) 112g,
They are independent via the flange 122a.

112a is a device for forming glass Mk fibers from mixed glass. 121a and 1218' are empty) The high temperature gas sent to 112a is empty) 11
It is blown out from the nozzle surface of 2a, collides with the lath similarly discharged from the nozzle, and stretches it downward (in the direction of the arrow in the figure) to form glass fibers.

That is, the combustion gas led out from the first combustion chamber through the pipe irl2'' is mixed with liquid fuel in the atomizer 109', and sent to each second combustion chamber through valves 120a-13=~e. The fuel gas mixture introduced into the combustion chamber is combusted by the molecular oxygen contained therein so that the molecular oxygen content is between 0 and 2% by volume, preferably between O and O.
1% by volume, more preferably 0-0.5% by volume of high temperature combustion gas is produced.

A preferred embodiment of the present invention is that the combustion gas led out from the first combustion chamber through the pipe 102'' is mixed with non-oxidizing inert gas through the valve 113 before the atomizer 109'. Well, valve 111 again
This can also be carried out by mixing non-oxidizing inert gas with the fuel sent through the valve 114 before the atomizer 109'.

In addition, in FIG. 1, 115 is a gaseous fuel tank.

Gaseous fuel can be used instead of liquid fuel, and the first
It is introduced into the combustion chamber 101.

When using gaseous fuel, the atomizer 109 is not necessary, but since gaseous fuel is suitable for smoothly performing the initial combustion in the first combustion chamber, the initial combustion is performed first with gaseous fuel. Since it is usually advantageous to then perform combustion instead of the liquid material, it is advantageous to provide an atomizer 109.

As is clear from the above, according to the method of the present invention, if a part of the pot unit (a), for example, breaks down, the first combustion chamber and the other pot units (for example, 1), c.
, d, and e while continuing to operate valves 120., d, and e. By closing the combustion chambers 121a, 121a' and the pot 112a, the combustion operation of the second combustion chambers 121a, 121a' and the pot 112a can be stopped and the malfunction can be repaired, and by removing the 7-run no. 122a, it can be replaced with a new pot unit. .

Also, when restarting the bot unit after repair or replacement, please use valve 1.
Just by opening 20a, fuel gas is immediately introduced into the second combustion chamber and combustion is restarted.

[Brief explanation of drawings]

FIG. 1 of the accompanying drawings is a schematic flowchart 15 of a high-temperature gas production system suitable for carrying out the method of the present invention. 101 first combustion chamber, 103 ejector, 104
Air compressor, 106 Liquid fuel tank, 109
．． 109' Atomizer, 12]a. 1211+, 121c, 121d, 12'1e, 121
a'121b',121c',121d' and 121e' Second combustion chamber-18-'

Claims (1)

[Claims] 1. (1) Burning a gaseous fuel or a gaseous mixture containing vaporized fuel and air in a first combustion chamber to generate a combustion gas containing molecular oxygen; (2) From the first combustion chamber. (3) mixing a part of the combustion gas with gaseous fuel or vaporizable fuel and air to prepare a gas mixture containing gaseous fuel or vaporized fuel and air; (4) The gaseous mixture is introduced into the first combustion chamber and thus circulated through steps (1) to (4) above, and (5) the remainder of the combustion gas containing molecular oxygen from step (2) of paragraph 1. (6) preparing a gas mixture containing gaseous fuel or vaporized fuel and molecular oxygen by mixing vaporized fuel or vaporizable fuel and air if necessary; and (6) dividing the gas mixture into a plurality of second combustion chambers. 1-(7) Burning the gas mixture in each second combustion chamber to generate combustion gas, and (8) extracting the combustion gas in step (7) as a high-temperature gas. Characteristic high-temperature gas production method. 2. Mix non-oxidizing inert gas into the remainder of the combustion gas containing molecular oxygen from step (2) above, before mixing the gaseous fuel or vaporizable fuel in step (5) above. 2. The method according to claim 1. 3. Before mixing the gaseous fuel or vaporizable fuel in the step (5) above with the remainder of the combustion gas containing molecular oxygen from step (2) above, add the gaseous fuel or vaporizable fuel. 2. The method according to claim 1, wherein the material is mixed with a non-oxidizing inert gas in advance.