JPH05272407A - Heater head of hot gas engine - Google Patents

Abstract

PURPOSE:To heat working gas in each heater tube uniformly by arranging fin on a center heater tube, and relatively enlarging the interval between a pair of heater tubes arranged on the center thereof from the interval between a pair of outer heater tubes. CONSTITUTION:A plurality of heater tubes 16 are provided to connect a cylinder 17 to a heat accumulator housing 18. Those heater tubes 16 are arranged circumferentially on manifolds 19, 21, and fins 22, 23 are arranged on heater tubes 16a, 16b arranged on the center side while uniformalizing the diameters r0 of respective heater tubes 16. The interval S1 between the heater tubes 16a, 16b arranged on the center side is enlarged relatively from the interval S3 of the heater tubes 16c, 16d arranged outward. It is thus possible to increase an endothermic mount so as to heat working gas in respective heater tubes 16a to 16d uniformly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater head for a hot gas engine.

[0002]

2. Description of the Related Art As a conventional technique for a combustor of a Stirling engine, there is, for example, "Heater gas engine heater head" disclosed in Japanese Utility Model Laid-Open No. 60-155759. This conventional technique will be described with reference to FIG. 4. A cylinder 72 forming an expansion space 71 of a hot gas engine and a heat storage housing 73 are connected via a heater tube 74. Here, in order to interpose a plurality of heater tubes 74, the cylinder 7
Manifolds 75 and 76 are arranged between the heater 2 and the heater tube 74, and between the heat storage housing 73 and the heater tube 74, respectively. And the expansion space 71
The working gas reciprocates between the compression space (not shown) and the compression space (not shown) via the heat storage housing 73 and the heater tube 74.

At this time, the cylinder 72 and the manifold 7
Since the throttle portions 77 and 78 are present at the connection portion with 5 and the connection portion between the heat storage housing 73 and the manifold 75, the flow of the working gas concentrates at the center of the manifolds 75 and 76.

The concentration of the working gas causes variations in the flow rate of the working gas in the plurality of heater tubes 74, so that the working gas cannot be efficiently heated. So manifold 7
Rectifying plates 79 and 80 are arranged in the centers of the heater tubes 5 and 76, respectively, so that the working gas can easily flow to the heater tubes 74 arranged outside.
The working gas is made to flow uniformly over the entire area.

[0005]

However, due to the presence of the straightening vanes 79 and 80, the flow of the working gas is enlarged or reduced, and the pressure loss of the working gas is increased. As a result,
This leads to a decrease in the output of the hot gas engine and a malfunction.

Therefore, it is a technical object of the present invention to uniformly heat the working gas in the plurality of heater tubes without obstructing the flow of the working gas.

[0007]

[Constitution of the invention]

[0008]

The technical means of the present invention taken to solve the above-mentioned technical problems of the present invention is a plurality of heater tubes connecting a cylinder and a regenerator housing, and a cylinder and a heater. A heater head of the hot gas engine is configured with a manifold arranged between the heater tube and the heat accumulator housing and between the heater tube and the heater tube. The heater tubes are circumferentially arranged on the manifold, and In addition to making the tube diameter uniform, the fins are arranged on the heater tubes arranged on the center side, and the distance between the heater tubes arranged on the center side is more relative to the distance between the heater tubes arranged on the outside. That is to make it wider.

[0009]

According to the above-mentioned technical means of the present invention, since the fins are arranged in the heater tubes arranged on the center side, the amount of heat absorbed therein increases, and the working gas in any of the tubes is heated uniformly. To be done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the technical means of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a heater head of a hot gas engine.
Here, the combustion space 11 of the hot gas engine is composed of a housing 12 having a heat insulating material, and a fuel injection nozzle 13 and a swirler 14 are arranged at the center of the top of the housing 12. The swirler 14 gives a swirling flow to the combustion air, and an unillustrated air preheater and blower and a passage 15 are provided.
Through the. Below the combustion space 11, a plurality of heater tubes 16 of a hot gas engine are arranged. The heater tube 16 connects the cylinder 17 and the heat storage housing 18, and the heater tube 16 and the cylinder 17 are connected to each other.
Manifolds 19 and 21 are arranged between the heater tube 16 and the heat storage housing 18, respectively. The exhaust gas of the combustion gas generated in the combustion space 11 flows out from the exhaust outlet 20 to the air preheater.

In FIG. 2, a plurality of heater tubes 16 are provided.
a, 16b, 16c, 16d are manifolds 19, 21
The pipes are arranged in a circular shape on the upper side, and each pipe diameter is r
It is 0 and is considered to be uniform. However, the fins 22 and 23 are arranged in the heater tubes 16a and 16b arranged on the center side so that the working gas easily flows. Also,
Spaces s1 between the heater tubes 16a and 16b arranged on the center side and between the heater tubes 16b and 16c.
s2 is a heater tube 16c, 16 arranged outside
It is relatively wider than the interval between d. In this embodiment, the relationship between the intervals is s1>s2> s3.
The arrangement of the heater tubes 16 is symmetrical in FIG. 3 as well.

The operation of the heater head of the hot gas engine having the above construction will be described.

The air sent from a blower (not shown) is
It is preheated by the high-temperature exhaust gas in the air preheater, heated, and guided to the swirler 14. The air to which the swirl flow is given by the swirler 14 is mixed with the fuel injected from the fuel injection nozzle 13 and ignited to perform continuous combustion. The high temperature combustion gas generated by this continuous combustion is the heater tube 1
Guided to 6. Here, heat exchange is performed between the high-temperature combustion gas and the working gas flowing in the heater tube 16, the working gas in the heater tube 16 is heated and the combustion gas is cooled, and the combustion gas is burned in the combustion space 11. Is exhausted to the outside from the exhaust gas outlet 20 located above.

Here, the working gas tends to concentrate on the heater tubes 16a and 16b arranged in the center, but since the fins 22 and 23 are arranged on the heater tubes 16a and 16b, the amount of heat absorbed there. Increase. Since the distance between the adjacent heater tubes on the center side is wide, the flow rate of the high temperature combustion gas increases, which can cope with the increase in the amount of heat absorption described above and can offset the flow resistance due to the fins 22 and 23. .. On the other hand, the outer heater tube 16c,
Only a relatively small amount of working gas flows through 16d, but the heat absorption amount there is relatively small because no fins are provided. As a result, the flow of the working gas throughout the heater tube 16 varies, but since the amount of heat absorbed from the combustion gas is proportional to the flow rate of the working gas depending on the installation position, the working gas is evenly distributed throughout the heater tube 16. Be heated.

[0016]

As described above, in the present invention, the fins are arranged in the heater tube arranged on the center side,
The heat absorption amount of the working gas is proportional to the flow rate distribution of the working gas in the manifold, and the heat absorption amount is proportional to the heat absorption amount. By making it relatively wider than the interval, the working gas is heated uniformly as a whole.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a heater head of a hot gas engine according to an embodiment of the present invention.

FIG. 2 shows an enlarged cross-sectional view of a main part in FIG.

FIG. 3 shows a configuration diagram of a heater head of a conventional hot gas engine.

[Explanation of symbols]

 17 cylinders, 18 heat storage housing, 16 heater tubes, 19 and 21 manifolds, 22 and 23 fins,

Claims (1)

[Claims] 1. A plurality of heater tubes connecting a cylinder and a regenerator housing, a manifold disposed between the cylinder and the heater tube, and between the regenerator housing and the heater tube, respectively. The heater tubes are circumferentially arranged on the manifold to make the tube diameter of each heater tube uniform, and to arrange the fins in the heater tubes arranged on the center side, and A heater head for a hot gas engine, wherein a space between the heater tubes arranged in the above is relatively wider than a space between the heater tubes arranged outside.