JPS58157061A - Layer-built fuel cell - Google Patents

Abstract

PURPOSE:To increase the homogeneity of the internal temperature distribution of a temperature regulating body by making each of heat-exchange pipes, which are attached to the temperature regulating body, to have a double-pipe structure formed by inserting an inner tube having opened ends into an outer tube having closed ends. CONSTITUTION:Heat-exchange pipes 6 are attached to a temperature regulating body 5 which is installed in the middle of a stacked body, which is formed by stacking in order a plural number of units each consisting of a fuel electrode, an electrolyte matrix, an oxidizer electrode and a gas-separating plate. Each heat-exchange pipe 6 is made by inserting an inner tube 6a having opened ends into an outer tube 6b having closed ends. Circulating water, after flowing into the inner tube 6a from a circulating-water inlet pipe 7, flows through the inner tube 6a in a given direction, reverses its direction at the end of the outer tube 6b, and flows through the outer tube 6b out into an outlet pipe 8. As a result, since circulating inflow water and circulating outflow water exchange their heat through the wall of the inner tube 6a to perform heating or cooling, the homogeneity of the temperature distribution of the regulating body 5 can be widely increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a J-type fuel tank, and particularly to a temperature regulator thereof.

A conventional device of this type is shown in FIG. In the figure, (1) is a temperature control body made from a carbon plate or the like, which has a fuel flow path and an oxidizer flow path (not shown) on the upper and lower surfaces, respectively, and (2) is this temperature control body (1). U-shaped heat exchange pipes installed in (3) and (4)
) are the circulating water inlet pipe and circulating water outlet pipe connected to this heat exchange pipe (21) and installed outside the temperature If controller (1). Next, the operation will be explained.Fuel electrode, electrolyte matrix In a fuel cell in which a plurality of single cells each consisting of an oxidizer electrode are stacked together using a gas separation plate, the fuel cell is heated from room temperature to operating temperature at startup.

During operation, it is necessary to remove excess heat and cool it to maintain a constant temperature, so a temperature regulator is inserted and installed for each number of cells. That is, the Yudan water inlet pipe (3
) and the circulating water outlet pipe (4), hot water is supplied to the zero-order heat exchange piping (2) at startup. During operation, the temperature of the stacked fuel cell is controlled by forcing cooling water to circulate and heating or cooling the temperature regulator (11). The regulator (11) consists of an upper plate (1a) and a lower plate (lb) in order to efficiently transfer heat to and from the fuel cell main body, and inside the lower plate (Ib) there is a heat exchange pipe (2 ) is installed in the U-shaped groove, attach the heat exchanger (2) to this groove, insert a filler into the gap between it and the lower plate (lb), and then replace the upper plate (1a). The structure is made by turning turnips and making them into a single piece.

Conventional temperature regulators are constructed as described above, so
Since the hot wire such as hot water and cooling water directly exchanges heat with the temperature control body from the inlet to the outlet of the heat exchange piping, the heat exchange rate is strong at the inlet and weak at the outlet.
Therefore, it was difficult to make the in-plane temperature distribution of the temperature controller body uniform. This invention was made to eliminate the drawbacks of the conventional ones as described above. It is intended to have a uniform temperature distribution in the temperature regulating body by structuring the temperature to flow from the inner tube to the outer tube or vice versa.

Hereinafter, a dormitory embodiment of the present invention will be explained with reference to the drawings. Third
In the figure, (5) is a temperature regulator made of a carbon plate, etc., which has a fuel channel and an oxidizer channel (not shown) on the upper and lower surfaces, respectively, and (6) is this temperature regulator (5). A heat exchange pipe (7) in the shape of a straight tube with a double pipe structure installed inside the pipe, (7) is connected to the inner pipe of this heat exchange pipe (6), and a nine-circulation seismic water inlet pipe (8) is a circulating water outlet pipe connected to the outer pipe of the heat exchange pipe (6). In FIG. 4, an example of the structure of the temperature regulating body (5) is shown. The temperature regulating body (5) is divided into an upper plate (5a) and a lower plate (5b), and the upper plate (5a) There is a fuel flow path on the top surface and a bottom plate (5b).
has a structure in which the surface in contact with the upper plate (5a) has a rectangular groove in which the heat exchange piping (6) is installed, and the other surface has an oxidizing agent flow path, and the heat exchange piping (6) is installed. hand! 21!1
After inserting the filler into i, the upper plate (5a) and lower plate (5b) are attached and integrated.

Next, the operation will be explained. In stacked fuel cells,
Temperature control body (temperature control body is inserted and installed for each number of cells,
Alternatively, it may be installed on the upper and lower surfaces of a plurality of stacked single ponds, and the circulating water inlet pipe (7) and circulating water outlet pipe (8) are connected to the respective main pipes. Next, the heat exchange piping (
6) Hot water is forcedly circulated during K startup, and cooling water is forcedly circulated during operation to heat or cool the temperature regulator (5). The flow of the circulating water at this time will be explained in detail with reference to a cross-sectional view of the temperature regulator shown in FIG. Circulating water inlet pipe (7)
The circulating water flowing in from the inner pipe (6a) of the heat exchange pipe (6)
) flows in a fixed direction, and since the inner tube (6a) has an open tip and the outer tube (6b) has a closed tip, the flow direction is reversed at the tip of the heat exchange pipe (6). The water flows through the outer pipe (6b) and flows out from the circulating water outlet pipe (8). That is, in the double pipe part of the heat exchange piping (6) installed in the temperature regulator (6), the circulating water flows through the inner pipe (6a).
Heat exchange (referred to as self-heat exchange) is carried out between the inflow circulating water and the outflow circulating water through the wall of the inner pipe (6a) while the water flows in from the inner pipe (6b) and flows out from the outer pipe (6b). Next, after this self-heat exchange, the inflow circulating water exchanges heat with the main body of the temperature regulator (5) through the tube wall of the outer tube (6b).

The temperature regulator (5) heats or cools the main body of the stacked fuel cell. In this way, the inflowing circulating water exchanges its own heat, and after that, the temperature regulator (5) heats or cools the main body. Therefore, conventional heat exchange piping (2
), the uniformity of the in-plane temperature distribution of the main body of the temperature regulator (5) is improved by more than twice. In addition, since the heat exchange pipe (6) has a straight pipe shape, it is easy to attach and detach the inner pipe (6a) of the heat exchange pipe (6) after adhering and integrating the main body of the temperature regulator (5). Maintenance and inspection are easy.

In the main embodiment, the circulating water to the heat exchange piping (6) flows from the inner pipe to the outer pipe, but it may flow from the outer pipe to the inner pipe for self-heat exchange.

Further, although the heat exchange piping (6) is shown as a straight circular pipe, it may be a curved pipe or a square pipe. Furthermore, the temperature control body (5) shows the upper plate (5a) and the lower plate (5b) bonded and integrated, but the heat exchange piping (6) is attached to the integrated upper plate and lower plate. Even if you process the installation groove and install it ↓
stomach.

As described above, the present invention provides heat exchange piping.

A double tube structure is adopted in which an inner tube with an open tip is inserted into an outer tube with a closed tip, and the heat medium flows from the inner tube to the outer tube or from the outer tube to the inner tube. The uniformity of temperature distribution is improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the internal piping seen through a conventional temperature regulator, Fig. 2 is an exploded perspective view of the conventional temperature regulator, and Fig. 3 is a 15th embodiment of the present invention. FIG. 4 is a perspective view showing the internal piping as seen through the temperature control body of the main part of the invention; FIG.
FIG. 5 is a cross-sectional side view showing the main part of the temperature regulator according to an embodiment of the present invention. In addition, the same reference numerals indicate the same or corresponding parts (6) Temperature regulator, (6) Heat exchange piping, (
6a) °...Inner tube, (6b)...Outer feed tube, (7)
... Circulating water inlet pipe, (8) Circulating water outlet pipe. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3 Procedural amendment (voluntary) Commissioner of the Japan Patent Office 1, Indication of case Patent application Shomar 5ssos No. 2,
Name of the invention: Stacked fuel cell 3, Representative Hitoshi Katayama of the person making the amendment, Part 6, Detailed explanation of the invention in the specification subject to the amendment, column 6, Page 6, lines 2 to 2 of the statement of contents of the amendment. Line 8 [After gluing and integrating the temperature regulator (6) body, the inner pipe (6) of the heat exchange piping (6)
a) Correct J to [heat exchange piping (6) or inner pipe (61) J after attaching to temperature regulator (5) and inserting filler into the gap. that's all

Claims (2)

[Claims] (1) In a J-type fuel cell, a temperature control body is installed in the middle or on the surface of a shell+m structure in which a plurality of fuel electrodes, electrolyte matrix, oxidizer W&, and gas separation plates are sequentially laminated. The attached heat exchange piping has a double-tube structure in which an inner tube with an open tip is inserted into an outer tube with a closed tip and an inner tube with an open tip, so that the heat medium flows through the inner tube and the outer tube. stacked fuel cells. (2) The stacked fuel cell according to claim 1, wherein the heat exchange pipe has a straight pipe shape.