JPS6060423A - Heat generating agent for starting metallic combustion apparatus - Google Patents

Abstract

PURPOSE:To manufacture a heat-generating agent for starting a metallic combustion apparatus used for a steam generator fitted as a power source in the case when an exothermic reaction is generated by a metal and an oxidizing agent, particularly, the case of an underwater sailing body, etc. CONSTITUTION:A pellet-shaped main agent 3 mainly comprising metallic powder and perchlorate, a pellet-shaped combustion assistant 2, which has the same components as the main agent but is smaller than the main agent, an igniting agent 4 for igniting the combustion assistant and an electric ignition section 5 are made to be contained, and an outer circumferential section is wrapped by a porous material 1, thus forming a heat-generating agent for starting. The main agent 3 is ignited by using the igniting agent 4 composed of metallic powder, a metallic oxide, etc. generating no gas and the ignition ball 5, and the ignition ball 5 is ignited by an igniting wire 6. When using the heat-generating agent for starting, lithium metal (a) in a metallic combustion apparatus completely sealed can be melted and heated instantaneously, and the heat-generating agent (b) can be employed preferably as a power source for an underwater projectile body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exothermic agent for starting a metal combustor such as an alkali metal, and more specifically, an exothermic agent for starting combustion of a metal combustor that causes an exothermic reaction between a metal and an oxidizing agent. The present invention relates to exothermic agents, and particularly to exothermic agents for starting metal combustors used in steam generators suitable as power sources for underwater vehicles and the like.

Traditionally, metal combustors have been used for a variety of applications.

The present invention aims to suitably apply the principle of this metal combustor to a steam generator that is a power source for an underwater vehicle.

In general, a closed system is considered effective as a propulsion power generation device for underwater vehicles, which are becoming deeper and more powerful. requires a large amount of fuel.

By the way, alkali metals (for example, lithium: Ll) have been attracting attention as fuels, and by adding an oxidizing agent (for example, sulfur hexaphosphate: SF) to these metals, the following reaction can be obtained.

8Li+8F, -+ Lj4S+6LiF+3. /JW
Hr/kli' (Li and S F6cr4 (per 16i)
A metal combustor that performs such a reaction needs to melt the alkali metal in a short time (on the order of several seconds) when starting combustion. This is because in a solid state, it hardly reacts with oxidizing agents.

Furthermore, due to the special circumstances of being used for underwater vehicles, there are various restrictions, and there is a need for an alkali metal melting heating agent that satisfies these restrictions. Moreover, this heating agent also has the purpose of greatly contributing to the rapid increase in output of the power generation device in the initial stage, as an aid to the relatively slow response reaction of metal combustion.

The present invention has been made to provide the above-mentioned alkali metal melting heating agent.

In other words, the present invention comprises a pellet-shaped base material in which a metal powder such as At and a perchlorate such as KCl-0° are blended in a stoichiometric equivalent ratio, and at least a portion of the base material is disposed at one end. A pellet-shaped combustion improver which has the same composition as the above-mentioned main agent and is smaller than the main agent, an ignition agent for igniting the combustion improver, a holder disposed at the front end of the ignition agent, and a holder that penetrates the holder. and an ignition wire whose one end is joined to the ignition ball in the ignition agent, the main agent, combustion improver, ignition agent, holder, wire mesh, etc. This invention relates to an exothermic agent for starting a metal combustor, which is made of a material with a large number of holes, such as metal (the same applies hereinafter).

The present invention has the following advantages.

Melt and heat. That is, it has a high energy density, a fast reaction, and good heat transfer to the alkali metal.

(2) No moisture is generated by the reaction.

(3) The main agent and combustion improver have low hygroscopicity. Therefore, it is easy to manufacture, and also easy to store and handle.

(4) The volume of the main agent and combustion aid can be reduced by squeezing, and the burning rate can be controlled depending on the degree of squeezing.
I can do it.

(5) There is no danger. (This type of reaction is explosive due to severe impact, but it can be made less sensitive than ordinary gunpowder by adjusting the particle size of the raw materials.) (6) It is lightweight and compact.

Furthermore, since the metal combustor is hermetically sealed, gas generation is minimal, and heat loss due to gas generation itself is minimal. According to the present invention, such a metal combustor can be suitably used as a power source for an underwater vehicle.

FIG. 1 is a diagram showing an embodiment of the exothermic agent of the present invention.

In Fig. 1, 6 is the main agent for melting and heating the alkali metal, which is made by blending At and xczo in a theoretical equivalent ratio and forming it into a pellet shape with a small amount of binder. Decide the degree of compression. 2 is the main ingredient 3
It is a combustion aid that is added in small amounts to promote ignition and combustion, and it makes the size of the pellets smaller than the main agent. Further, depending on the case, the particle size of At 2 is made finer than that of At 2 of the main ingredient, and the degree of compression is also made lower. Therefore, although the volumetric effect* is somewhat degraded, it is still effective for the above-mentioned purpose.

The main agent 3 is ignited using an ignition agent 4 made of gas-free metal powder, metal oxide, etc., and an ignition ball 5, which are fixed with a holder 7. The ignition ball 5 is ignited through an ignition line 6. Combustion aid 2, main agent 3, ignition agent 4, ignition ball 5, ignition wire 6
, the holder 7 is wrapped with a wire mesh or the like 1 to form one starting heating agent.

The combination of Aj powder and oxidizing agent KOt04 is At
Among the combinations of powder and other oxidizing agents, it has the sixth highest energy density per weight (2400 kcal/kg), has low hygroscopicity, and does not generate gas. It is used as the main agent and combustion aid. By doing this, the alkali metal @
Can be easily melted and heated.

However, according to the method used here, lithium metal in a completely sealed metal combustor must be melted and heated instantaneously (on the order of several seconds). In the combination of At and KO404,
Since the combustion temperature reaches 5500°C, high pressure gas is temporarily generated unless rapid cooling is performed. Therefore, in the present invention, the combustion speed is controlled by changing the size of the pellet, the degree of compression, and the grain size of At, and the entire pellet is wrapped with a wire mesh, etc., to improve the transfer of heat to the alkali metal. .

EXAMPLE Using L1500F as the alkali metal, a metal combustor shown in FIGS. 2(a) and 2(b) was prepared according to the following specifications.

Note that FIG. 2(A) is a cross-sectional view, and FIG. 2(B) is an external view, and A and B in FIGS. 2(A) and 2(B) indicate thermocouples.

Specifications When ignition was carried out with the above specifications, as shown in Figure 6, it was possible to melt and heat Ll within 3 seconds after ignition, and the pl and pressure rise was only slightly at the peak pressure of 6.5. 9
/α2. Note that A in Figure 5 is thermocouple A, and B is thermocouple A.
shows the temperature change measured by thermocouple B.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of an embodiment of the exothermic agent of the present invention, FIGS. 2(a) and (b) are diagrams showing a metal combustor prepared in an example of the present invention, and FIG. It is a chart showing the results obtained in Examples. Sub-agents 1) Meifuku agent Ryo Hagiwara -

Claims (1)

[Claims] A pellet-shaped main agent whose main ingredients are metal powder and perchlorate, a pellet-shaped combustion improver that has the same ingredients as the main agent but is smaller than the main agent, and an ignition agent and an electric ignition part to ignite it. A heating agent for starting a metal combustor, characterized in that the outer periphery is covered with a porous material.