JP3607437B2 - Atmospheric gas generator - Google Patents

Description

[0001]
【Technical field】
The present invention relates to an atmospheric gas generator for creating an atmospheric gas used in a heat treatment furnace, a brazing furnace, and the like.
[0002]
[Prior art]
Conventionally, an atmospheric gas used for a heat treatment furnace, a brazing furnace, or the like has been created in an atmospheric gas generator as shown in FIGS.
The atmospheric gas generator 9 includes a burner 99 and a furnace body 90 provided with a combustion chamber 91 in which the burner 99 is disposed. The combustion chamber 91 is provided with a U-shaped retort tube 2 filled with a reaction catalyst.
[0003]
In the atmospheric gas generator 9, atmospheric gas is generated as described below. First, the burner 99 burns in the combustion chamber 91. Thereby, the combustion exhaust gas 82 is generated. The combustion chamber 91 is provided with an exhaust pipe 98 for discarding the combustion exhaust gas 82 to the outside.
Accordingly, a flow of the combustion exhaust gas 82 from the burner 99 toward the exhaust pipe 98 is generated, and the retort tube 2 is heated by the flow of the combustion exhaust gas 82.
[0004]
A raw material gas is introduced into the inlet 21 of the heated retort tube 2. The source gas is heated in the retort tube 2 and becomes atmospheric gas by the action of the reaction catalyst.
As described above, atmospheric gas is generated from the outlet 22 of the retort tube 2.
[0005]
[Problems to be solved]
However, the conventional atmospheric gas generator 9 has the following problems.
The flame generated in the gas burner 99 has a temperature at the tip thereof close to 2000 ° C. For this reason, the retort tube 2 cannot be provided in the center of the combustion chamber 91. As shown in FIGS. 5 and 6, the retort tube 2 is disposed near the wall surface of the combustion chamber 91 so as not to come into direct contact with the flame.
For this reason, in the conventional atmospheric gas generator 1, a large combustion chamber 91 is required, and as a result, the apparatus size increases.
[0006]
Further, by arranging the retort tube 2 along the wall surface, a large temperature difference occurs between the side facing the combustion chamber 91 and the side facing the wall surface in the retort tube 2.
Therefore, temperature unevenness occurs inside the retort tube 2, and as a result, it becomes difficult to obtain a predetermined composition stably.
In addition, it was a factor that could not cope with a wide range of changes in gas generation amount and composition.
[0007]
In view of such problems, the present invention intends to provide an atmospheric gas generator capable of efficiently producing an atmospheric gas having a small apparatus size and a stable composition.
[0008]
[Means for solving problems]
The invention of claim 1 comprises a furnace body, a combustion chamber provided therein, at least one retort tube provided in the combustion chamber, and a combustor and a heat storage body for injecting a flame into the combustion chamber. It consists of a regenerative burner with
The retort tube is connected to an introduction pipe for introducing a raw material gas into the retort tube.
In the atmospheric gas generator, the inside of the retort tube is filled with a reaction catalyst for causing the source gas to react with the atmospheric gas.
[0009]
The heat storage burner is configured to generate a flame by burning in a combustor, introduce flue gas generated from combustion in the combustor into a heat storage body, and recover the heat held by the flue gas. A burner.
As the heat storage body, a ceramic honeycomb, a granular body, or the like can be used.
[0010]
Examples of the atmospheric gas include endothermic gases (in volume composition, CO ₂ : 0.17 to 0.48%, CO: 21%, H ₂ : 40%, and the rest is N ₂ ). Can do.
As the reaction catalyst, a Ni-based catalyst, ruthenium, rhodium, Pd-based catalyst, or the like can be used.
Further, as the retort tube, a straight tubular straight tube can be used in addition to the U-shaped tubular tube shown in the following embodiment.
[0011]
The operation of the present invention will be described below.
In the atmospheric gas generator according to the present invention, a regenerative burner is used for heating the combustion chamber. The flame generated from the above regenerative burner does not have a local high temperature part. Therefore, in the atmospheric gas generator according to the present invention, the retort tube can be installed near the center of the combustion chamber, that is, in a portion exposed to the flame.
For this reason, the combustion chamber can be made smaller, and thus the apparatus size can be made smaller.
[0012]
Further, when the heat storage burner burns, combustion exhaust gas is generated from the combustor in the combustion state, and the combustion exhaust gas flows into the heat storage body in the heat storage state. Therefore, as shown in FIGS. 1 to 3 to be described later, there is a forced convection of the combustion exhaust gas due to a large wind force between them.
By providing the retort tube near the center of the combustion chamber, the retort tube is heated uniformly by the forced convection. Therefore, the composition of the atmospheric gas is stabilized.
In addition, since the temperature of the retort tube is kept uniform, it is easy to change the gas generation rate and composition.
[0013]
As described above, according to the present invention, it is possible to provide an atmospheric gas generator that can efficiently produce an atmospheric gas having a small apparatus size and a stable composition.
[0014]
In addition, as the heat storage type burner, one that can change the local high temperature part of the flame by itself as shown in claim 2 can be used, but one that functions as a pair of two burners is used. You can also
That is, when one of the first heat storage burners is in a combustion state, the combustion exhaust gas is introduced into the other second heat storage burner. Thereby, the heat storage body provided in the second heat storage burner can store the heat held by the combustion exhaust gas.
[0015]
Thereafter, the second heat storage burner is brought into a combustion state.
At this time, combustion air is fed into the second heat storage burner, and the combustion air is supplied to the combustor through the heat storage body. Therefore, the combustion air is heated by the heat storage body, and high-temperature combustion air can be supplied.
At this time, flue gas from the combustion chamber is introduced into the first heat storage burner, and heat is stored in the heat storage body of the first heat storage burner.
[0016]
Therefore, when the first regenerative burner is in a combustion state, forced convection of combustion exhaust gas from the first regenerative burner to the second regenerative burner occurs, and conversely, the second regenerative burner is in a combustion state. The forced convection of the combustion exhaust gas from the second heat storage type burner to the first heat storage type burner occurs.
As a result, the high temperature part of the flame does not stay locally, and the temperature inside the atmospheric gas generator becomes uniform.
[0017]
In addition, as a heat storage type burner, a third, fourth, or more burners may be provided as appropriate so that one is used as a heat storage state and another is used as a combustion state.
[0018]
Next, as in the invention of claim 2, the regenerative burner is preferably a one burner system capable of temporally changing the local high temperature portion of the flame with a single burner. In addition to the type having the flow path switching disk in the burner as shown in the embodiment and FIG. 4, there can be mentioned those having a switching valve outside.
Thereby, the regenerative burner can be made smaller and the installation area of the burner can be reduced.
Therefore, the atmosphere gas generator can be made smaller.
[0019]
Next, as described in claim 3, hydrocarbon gas, LNG, LPG, or coal gas can be used as the raw material gas.
By reacting these source gases and air, an atmospheric gas containing CO or the like can be produced (see the embodiment example).
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment An atmosphere gas generator according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 4, the atmospheric gas generator 1 of this example includes a furnace body 10, a combustion chamber 11 provided therein, four retort tubes 2 provided in the combustion chamber 11, and the above-described configuration. It comprises a one-burner type regenerative burner 5 having a combustor for injecting a flame into the combustion chamber 11 and a heat accumulator.
[0021]
The retort tube 2 is connected to an introduction pipe (not shown) for introducing the raw material gas into the retort tube 2.
In addition, the inside of the retort tube 2 is filled with a reaction catalyst for reacting the raw material gas with the atmospheric gas.
The regenerative burner 5 is a one-burner method in which the local high temperature portion of the flame can be varied with time by a single burner.
[0022]
As shown in FIGS. 1 to 4, the combustion chamber 11 is provided with four retort tubes 2 having a U-shaped cross section. One end of the retort tube 2 is a raw material gas inlet 21 and the other end is an atmospheric gas outlet 22.
[0023]
The retort tube 2 is filled with a Ni-based catalyst.
LNG is used as the source gas. The raw material gas reacts and decomposes with air by the action of the Ni catalyst to generate an endothermic gas having a volume composition of 20% CO, 40% H _{2 and} 40% N ₂ . This is the atmospheric gas produced in the atmospheric gas generator 1 of this example.
[0024]
Next, the heat storage burner 5 and the combustion thereof will be described.
As shown in FIG. 4, the regenerative burner 5 has a combustor 51, a regenerator 52, and a flow path switching disk 55, and a fuel gas 54 is supplied to the combustor 51 via a fuel gas nozzle 58.
[0025]
The heat accumulator 52 includes heat accumulators 521 and 522 that are partitioned by a partition wall, and the heat accumulator 521 is formed into an annular air chamber 56 by a through hole 551 of a flow path switching disk 55 that is rotatably provided around the fuel gas nozzle 58. The heat accumulator 522 is opened to the cylindrical exhaust chamber 57 by the through hole 552 of the flow path switching disk 55. On the other hand, the combustion chamber side of the heat accumulators 521 and 522 is opened to the combustor 51 by through holes.
[0026]
Combustion air 53 is supplied to an air chamber 56 by a combustion air blower 49, and is further injected into the combustor 51 from the through hole 551 of the flow path switching disk 55 via the heat accumulator 521 to be injected into the combustor 51. create.
As shown in FIGS. 1 and 2, the combustion exhaust gas 82 generated by the flame 40 circulates back to the combustor 51 so as to wrap the entire retort tube 12, and flows from the heat accumulator 522 of the heat accumulator 52 to the flow path switching disk. The low-temperature combustion exhaust gas 820 is discharged to the atmosphere via the through-hole 552 and the exhaust chamber 57.
[0027]
After a certain period of time, the flow path switching disk 55 rotates, the through hole 551 opens to the heat storage body 522, and the through hole 552 opens to the heat storage body 521 to reverse the air flow path and the combustion exhaust gas flow path.
As a result, the combustion air 53 becomes hot air from the air chamber 56 via the through-hole 551 and the heat storage body 522 and is injected into the combustor 51 to form a flame 40, and the combustion exhaust gas 82 is transferred from the heat storage body 522. Via the through-hole 551 and the exhaust chamber 57, it becomes a low-temperature combustion exhaust gas 820 and is released to the atmosphere.
Heat storage combustion is performed by repeating this operation at a constant cycle.
[0028]
Next, the effect in this example is demonstrated.
In the atmospheric gas generator 1, the regenerative burner 5 is used for heating the combustion chamber 11. The flame generated from the regenerative burner 5 does not have a local high temperature part. Therefore, the retort tube 2 can be installed near the center of the combustion chamber 11, that is, in a portion exposed to the flame.
For this reason, the combustion chamber 11 can be made smaller, and thus the apparatus size can be made smaller.
[0029]
Further, when the regenerative burner 5 is combusted, the combustion exhaust gas 82 is generated from the combustor in the combustion state, and the combustion exhaust gas flows into the heat storage body in the heat storage state.
Therefore, as shown in FIGS. 1 and 2, forced convection of the combustion exhaust gas 82 is generated in the combustion chamber 11 such that it returns from the center of the combustion chamber 11 to the heat storage burner 5 side through the wall surface. To do.
The retort tube 2 is provided near the center of the combustion chamber 11.
For this reason, the whole retort tube 2 provided in the center of the combustion chamber 11 is heated uniformly.
[0030]
In addition, since the temperature of the retort tube 2 is kept uniform, the amount of gas generation and composition can be easily changed.
[0031]
【The invention's effect】
As described above, according to the present invention, it is possible to provide an atmospheric gas generator that can efficiently produce an atmospheric gas having a small apparatus size and a stable composition.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a cross section of an atmospheric gas generator according to an embodiment.
FIG. 2 is an explanatory view of a cross section of an atmospheric gas generator according to an embodiment.
FIG. 3 is an explanatory view of a longitudinal section of an atmospheric gas generator according to an embodiment.
FIG. 4 is an explanatory view showing the structure of a heat storage burner according to the embodiment.
FIG. 5 is an explanatory view of an atmospheric gas generator according to a conventional example.
FIG. 6 is an explanatory diagram of an atmospheric gas generator according to a conventional example.
[Explanation of symbols]
1. . . Atmospheric gas generator,
10, 90. . . Furnace body,
11, 91. . . Combustion chamber,
2. . . Retort tube,
5. . . Regenerative burner,

Claims (3)

It comprises a furnace body, a combustion chamber provided therein, at least one retort tube provided in the combustion chamber, and a regenerative burner having a combustor and a heat storage body for injecting flame into the combustion chamber. Along with
The retort tube is connected to an introduction pipe for introducing a raw material gas into the retort tube.
An atmosphere gas generator characterized in that the inside of the retort tube is filled with a reaction catalyst for causing the source gas to react with the atmosphere gas. 2. An atmosphere gas generator according to claim 1, wherein the regenerative burner is a one burner system capable of temporally changing the local high temperature portion of the flame with a single burner. 3. The atmospheric gas generator according to claim 1, wherein the source gas is hydrocarbon gas, LNG, LPG, or coal gas.

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