JP2006317108A - Combustor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustor and its manufacturing method capable of inexpensively manufacturing the combustor free from gas leakage between a premixed gas flow channel and a combustion gas flow channel. <P>SOLUTION: In this combustor 1 comprising a combustion chamber 7, the premixed gas flow channel 8 for allowing the premixed gas of fuel and a gas including at least oxygen to the combustion chamber 7, and the combustion gas flow channel 9 for discharging the fuel gas from the combustion chamber 7, a tubular body is stored in a holding member 2 in a scroll state, the inside of the tubular body 3 is formed as the premixed gas flow channel 8, and the fuel gas flow channel 9 is formed by a clearance surrounded by the tubular body 3 and an inner wall surface of the holding member 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a combustor that uses chemical reaction heat from combustion and a method for manufacturing the combustor.

  A conventional combustor of this type is disclosed in Patent Document 1. As shown in FIGS. 5 and 6, the combustor 100 is formed in a disc-like container 101 composed of a container main body 101 a and a lid body 101 b that closes the opening of the container main body 101 a, and substantially in the center of the container 101. A combustion chamber 102 having an ignition plug (not shown), a premixed gas flow path 103 formed in a spiral shape in the container 101 around the combustion chamber 102, and adjacent to the premixed gas flow path 103; Similarly, a combustion gas flow path 104 formed in a spiral shape in the container 101 with the combustion chamber 102 as the center is provided. A partition wall 105 partitions the adjacent premixed gas flow path 103 and the combustion gas flow path 104.

  In the above configuration, when the premixed gas composed of the fuel and the oxidant is pumped to the premixed gas flow path 103 and ignited in the combustion chamber 102, the premixed gas burns in the combustion chamber 102. The combustion gas generated by this combustion a is discharged to the outside of the container 101 through the combustion gas channel 104. Since the premixed gas is continuously supplied to the combustion chamber 102, the premixed gas continues to burn in the combustion chamber 102. Since the premixed gas flowing in through the premixed gas flow path 103 receives the heat of the combustion gas through the partition wall 105, it is supplied to the combustion chamber 102 in a preheated state. As a result, the premixed gas is stably combusted in the combustion chamber 102. The heat generated by the combustion a is used for various purposes such as a heater.

By the way, the premixed gas flow path 103 and the combustion gas flow path 104 are formed by, for example, forming a spiral groove in the container main body 101a by cutting and closing the groove with the lid body 101b, or by casting. A container body 101a having a spiral partition wall 105 and a groove is formed, and the groove is closed by a lid 101b. Here, if there is a gap between the partition wall 105 of the container main body 101a and the inner wall surface of the lid 101b, the premixed gas and the combustion gas leak to each other, and the combustion efficiency decreases. Therefore, the premixed gas flow path 103 and the combustion gas flow path 104 need to be prepared so as not to leak each other.
Japanese Patent Laid-Open No. 2004-20083

  However, when the premixed gas passage 103 and the combustion gas passage 104 are formed by cutting or casting as in the conventional example, a very advanced technique is required. That is, in order to create the premixed gas flow path 103 and the combustion gas flow path 104 so that no gas leak occurs, it is required to make the height of the partition wall 105 constant at all positions. However, in cutting and casting production, a high level of technology is required to make all the heights of the partition wall 105 constant, and there is a problem that the production of the combustor 100 is very expensive.

  Therefore, the present invention has been made to solve the above-described problems, and is a low-cost one that does not cause a gas leak between a supply path that is a premixed gas flow path and an exhaust path that is a combustion gas flow path. It is an object of the present invention to provide a combustor that can be produced and a method for manufacturing the combustor.

  The invention according to claim 1 is a combustor comprising a combustion chamber, a supply passage for supplying fuel and oxidant to the combustion chamber, and an exhaust passage for discharging combustion gas in the combustion chamber, The combustor is characterized in that at least one of the supply path and the discharge path is formed of a single tubular body without a joint.

  The invention according to claim 2 is the combustor according to claim 1, wherein the tubular body is accommodated in a holding member, and the combustion chamber, the supply path, and the discharge path are formed in the holding member. It is a combustor characterized by being made.

  A third aspect of the present invention is the combustor according to the second aspect, wherein one of the supply path and the discharge path is formed of the tubular body, and the other of the supply path and the discharge path is the tubular body. And a combustor formed by a gap surrounded by the inner wall surface of the holding member.

  The invention according to claim 4 is the combustor according to claim 3, wherein the tubular body is arranged in a spiral shape around the combustion chamber.

  A fifth aspect of the present invention is the combustor according to any one of the second to fourth aspects, wherein the holding member has an accommodation chamber in which an upper surface is opened and the tubular body is accommodated. A holding member main body and a lid that covers the storage chamber of the holding member main body, and the tubular body is sandwiched between the inner wall surface of the holding member main body and the inner wall surface of the lid body. The combustor is characterized.

  The invention according to claim 6 is a method of manufacturing a combustor comprising a combustion chamber, a supply passage for supplying fuel and oxidant to the combustion chamber, and a discharge passage for discharging combustion gas from the combustion chamber. A step of forming a seamless single tubular body serving as the supply path or the discharge path into a spiral shape, and arranging the tubular body formed into a spiral shape in a holding member main body and holding the tubular body And a step of sandwiching the tubular body between the inner wall surface of the member main body and the inner wall surface of the lid body.

  According to the present invention, the single tubular body has a structure in which the airtightness inside thereof is reliably maintained, so that either one of the supply path for supplying the fuel and the oxidant and the discharge path for discharging the combustion gas is provided. Gas leakage occurs between the supplied fuel, oxidant (premixed gas), and combustion gas both when formed with a seamless tubular body and when both the supply passage and the discharge passage are formed with a tubular body. There is no. In addition, unlike the conventional example, a high processing technique and a manufacturing technique are not required for creating the supply path and the discharge path and maintaining the airtightness between these flow paths, and can be created at low cost.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 4 show an embodiment of the present invention, FIG. 1 is a plan view of the combustor 1, FIG. 2 is a front view of the combustor 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG. 2.

  1 to 4, the combustor 1 includes a flat disk-shaped holding member 2 and a single tubular body 3 disposed in the holding member 2. The holding member 2 includes a holding member main body 4 and a lid body 5. The holding member body 4 includes a disc-shaped bottom wall 4a and a circumferential side wall 4b erected at the outer edge of the bottom wall 4a, and a storage chamber 6 having an open upper surface is formed. The lid 5 has a disk shape and is joined to the upper surface of the holding member body 4 by brazing, welding, or the like so as to close the housing chamber 6. A substantially central position of the storage chamber 6 is formed as a combustion chamber 7. The combustion chamber 7 is provided with an ignition plug (not shown).

  The tubular body 3 has a seamless circular cross section and is arranged in a spiral shape in the storage chamber 6 with the combustion chamber 7 as the center. The inside of the tubular body 3 is a premixed gas flow that is a supply path for allowing a premixed gas of fuel and a gas containing at least oxygen as an oxidant (for example, oxygen, air) to flow into the combustion chamber 7 from the outside of the holding member 2. It is formed as a path 8.

  Further, between the adjacent tubular bodies 3, the gap between the upper and lower sides surrounded by the bottom wall 4 a and the lid 5 of the holding member 2, between the tubular body 3 and the circumferential side wall 4 b of the holding member 2, and A gap surrounded by the bottom wall 4a of the holding member 2 and the lid 5 is formed as a combustion gas flow path 9 that is a discharge path through which the combustion gas from the combustion chamber 7 flows out of the holding member 2. . The combustion gas passage 9 is opened to the outside of the holding member 2 through a passage outlet 10 formed in the circumferential side wall 4b.

  That is, the premixed gas flow path 8 and the combustion gas flow path 9 are each formed in a spiral shape with the combustion chamber 7 as the center, and both the flow paths 8 and 9 adjacent to each other are mutually connected via the tubular body 3. It is partitioned. The tube diameter of the premixed gas flow path 8 is set smaller than the extinguishing distance, which is a gap distance through which no flame can pass.

  Further, the tubular body 3 is accommodated in a state of being sandwiched in the accommodation chamber 6 by the bottom wall 4 a of the holding member 2 and the lid 5. By this clamping force, the tubular body 3 is fixed in a state of being held in a spiral shape in the holding member 2, and between the tubular body 3 and the bottom wall (inner wall surface) 4 a of the holding member body 4, or in the tubular body 3 and the inner wall surface of the lid 5 are in close contact with each other without a gap.

  In the above configuration, when a premixed gas composed of fuel and oxygen (or air) is pumped to the premixed gas flow path 8 and ignited in the combustion chamber 7, the premixed gas burns in the combustion chamber 7. To do. The combustion gas generated by this combustion is discharged to the outside of the holding member 2 through the combustion gas passage 9. Since the premixed gas is continuously supplied to the combustion chamber 7, the premixed gas continues to burn in the combustion chamber 7. The premixed gas passing through the premixed gas flow path 8 is preheated to an appropriate temperature because it receives the heat of the combustion gas through the tubular body 3. By this preheating, the premixed gas is stably combusted in the combustion chamber 7.

  In such a combustion process, the premixed gas flows through the premixed gas flow path 8 inside the single tubular body 3, and the combustion gas flows through the combustion gas flow path 9 outside the tubular body 3. Since the tubular body 3 has a seamless structure and the airtightness inside the tubular body 3 is reliably maintained, no gas leak occurs between the premixed gas and the combustion gas. And, as in the conventional example, it is necessary to have high processing technology, manufacturing technology, and inspection technology to create the premixed gas channel 8 and the combustion gas channel 9 and to maintain the airtightness between these channels 8 and 9. It can be created at low cost. For example, in the inspection, airtightness is confirmed at the time when the tubular body 3 is processed into a spiral shape, and it is only necessary to confirm the presence or absence of gas leakage from the outer periphery in the state of the finished product. Since inspection equipment can be used, it can be manufactured without cost. Further, when the tubular body 3 is used as the premixed gas flow path 8 and the portion formed by partitioning with the tubular body 3 is the combustion gas flow path 9 as in this embodiment, the combustion gas is transferred from the holding member 2. Since there is no particular problem even if it leaks, inspection of the finished product becomes unnecessary, and further cost reduction is possible.

  In this embodiment, the premixed gas flow path 8 is formed of a single tubular body 3, but the premixed gas flow path 8 and the combustion gas flow are formed even if the combustion gas flow path 9 is formed of a single tubular body. Both of the passages 9 may be formed of a single tubular body. Note that it may be formed of a two-hole tube. For example, two tubular bodies are arranged in the holding member, one of the tubular bodies is supplied to supply a fuel gas to the combustion chamber, and the other tubular body is supplied to supply an oxidizing gas such as air or oxygen to the combustion chamber. A path, a gap between these adjacent tubular bodies, and a gap between the upper and lower sides surrounded by the bottom wall and the lid of the holding member, a circumferential wall between the tubular body and the holding member, and an upper and lower sides of the holding member The gap surrounded by the bottom wall and the lid can be configured as a discharge path through which the combustion gas from the combustion chamber flows out of the holding member. In this case, it is not necessary to mix the fuel gas and the oxidizing gas in advance.

  In this embodiment, the tubular body 3 is accommodated in the holding member 2, and the combustion chamber 7, the premixed gas channel 8, and the combustion gas channel 9 are formed in the holding member 2. In the case where only the premixed gas flow path 8 is formed of the tubular body 3, the combustion gas flow path 9 can be easily created using a space other than the tubular body 3 in the holding member 2. Specifically, as in this embodiment, the combustion gas channel 9 is easily created by forming a gap surrounded by the tubular body 3 and the inner wall surface (the bottom wall 4a and the lid body 5) of the holding member 2. it can. Therefore, it contributes to the reduction of the manufacturing cost of the combustor 1. In addition, when only the combustion gas flow path 9 is formed in the holding member 2 with the tubular body 3, the premixed gas flow path 8 can be similarly easily created.

  In this embodiment, since the tubular body 3 is arranged in a spiral shape with the combustion chamber 7 as the center, the temperature distribution on the lid 5 of the holding member 2 can be made substantially uniform. Therefore, an optimum temperature distribution can be obtained when the combustor 1 is used as a heater.

  In this embodiment, the holding member 2 includes a holding member main body 4 having an accommodation chamber 6 in which an upper surface is opened and the tubular body 3 is accommodated, and a lid body 5 that covers the accommodation chamber 6 of the holding member main body 4. Since the tubular body 3 is sandwiched between the bottom wall 4 a of the holding member main body 4 and the lid body 5, the tubular body 3 can be easily fixed in the holding member 2. Therefore, it contributes to the reduction of the manufacturing cost of the combustor 1. Further, gas leakage between the combustion gas flow paths 9 partitioned by the tubular body 3 can be prevented. However, even if fuel gas leaks between the combustion gas passages 9, the combustion efficiency does not decrease. Since it is not necessary to fix the tubular body 3 to the holding member 2 so as to prevent such a gas leak, this also contributes to a reduction in the manufacturing cost of the combustor 1.

  The material used for the holding member 2 and the tubular body 3 is a heat resistant stainless steel such as SUS316 or SUS310, a heat resistant alloy such as Inconel, or the like.

  Examples of the premixed gas fuel include liquid fuels such as alcohols and hydrocarbons such as paraffinic hydrocarbons, and gaseous fuels such as methane, ethane, carbon monoxide, hydrogen, and acetylene.

  In the above embodiment, the premixed gas flow path 8 and the combustion gas flow path 9 are both formed in a spiral shape by arranging the tubular body 3 accommodated in the holding member 2 in a spiral shape. Of course, if the path 8 and the combustion gas flow path 9 can be arranged adjacent to each other, they may be formed in a shape other than the spiral shape.

  In addition, in the said embodiment, although the cross-sectional shape of the tubular body 3 is circular and the premixed gas flow path 8 is formed in the cross-sectional circular shape, it may be formed in shapes other than a cross-sectional circular shape. Of course. However, it is preferable to form a circular cross section because the specific surface area is small and the effective gas flow path is large.

  In this embodiment, the holding member main body 4 is composed of a bottom wall 4a and a circumferential side wall 4b. However, the outlet of the combustion gas passage 9 is directly provided at a portion formed by being partitioned by the tubular body 3. Thus, except for the circumferential side wall 4b, only the bottom wall 4b can obtain the same function and effect.

1 is a plan view of a combustor according to an embodiment of the present invention. 1 is a front view of a combustor according to an embodiment of the present invention. FIG. 2 shows an embodiment of the present invention and is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 shows an embodiment of the present invention and is a cross-sectional view taken along the line BB of FIG. It is a schematic block diagram of the combustor of a prior art example. It is a schematic sectional drawing of the combustor of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustor 2 Holding member 3 Tubular body 4 Holding member main body 4a Bottom wall 5 Lid body 6 Storage chamber 7 Combustion chamber 8 Premixed gas flow path (supply path)
9 Combustion gas flow path (discharge path)

Claims (6)

A combustor comprising a combustion chamber, a supply passage for supplying fuel and oxidant to the combustion chamber, and a discharge passage for discharging combustion gas in the combustion chamber,
A combustor, wherein at least one of the supply path and the discharge path is formed of a single tubular body without a joint. A combustor according to claim 1,
The tubular body is housed in a holding member;
The combustor, wherein the combustion chamber, the supply passage, and the discharge passage are formed in the holding member. A combustor according to claim 2, wherein
One of the supply path and the discharge path is formed of the tubular body,
A combustor, wherein the other of the supply path and the discharge path is formed by a gap surrounded by the tubular body and an inner wall surface of the holding member. A combustor according to claim 3, wherein
The combustor, wherein the tubular body is arranged in a spiral shape with the combustion chamber as a center. A combustor according to any one of claims 2 to 4, wherein
The holding member has a holding member main body having an accommodation chamber in which an upper surface is opened and the tubular body is accommodated;
A lid that covers the storage chamber of the holding member body,
A combustor, wherein the tubular body is sandwiched between an inner wall surface of the holding member body and an inner wall surface of the lid. A method of manufacturing a combustor comprising a combustion chamber, a supply path for supplying fuel and oxidant to the combustion chamber, and an exhaust path for discharging combustion gas from the combustion chamber,
Forming a seamless single tubular body to be the supply path or the discharge path into a spiral shape; and
A step of disposing the tubular body formed in a spiral shape in a holding member body, and sandwiching the tubular body between an inner wall surface of the holding member body and an inner wall surface of a lid. A method for manufacturing a combustor.

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