JPS637320Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an injection nozzle for metal combustion, that is, for injecting an oxidizing agent into molten metal for combustion.

FIG. 1 is an explanatory diagram showing a conventional device of this type. In the figure, a combustion chamber 1 is filled with molten metal 3 such as metallic lithium Li or sodium Na, and a combustion chamber wall surface 2 is cooled with water or other fluid. Then, an oxidizing agent such as sulfur hexafluoride SF ₆ is injected into the combustion chamber 1 through the injection nozzle 4, and the oxidizing agent and the metal come into contact and spontaneously burn. The oxidizing agent is supplied from the high pressure tank 5 to the nozzle 4 via a cutoff valve 6, a pressure regulating valve 7, and a one-way valve 8.

At the start of combustion, the metal 3 filled in the combustion chamber 1 is first melted by a heating device (not shown) and heated to a required temperature. At this time, since the molten metal such as lithium exhibits fluidity comparable to that of high-pressure water, it may enter the inside of the injection nozzle 4. Therefore, in order to prevent unexpected intrusion of molten metal 3 into the nozzle, it is usually necessary to cause a required amount of inert gas such as argon to flow out from the nozzle at the same time as the metal is melted. That is, inert gas is supplied from a high-pressure inert gas tank 9 to the injection port of the injection nozzle 4 via a cutoff valve 10, a pressure regulating valve 11, and a one-way valve 12.

However, the above method has the following drawbacks.

For example, when such a combustor is used as a heat source for an underwater vehicle or the like, it may be difficult to install two gas systems in terms of space and weight.

In addition, an inert gas is supplied to clean the inside of the nozzle and to change the gas ejected at a larger flow rate than the steady value as an initial injection phenomenon to an inert gas instead of an oxidizing agent to alleviate transient phenomena at the initial stage of combustion. The operation of switching the oxidizing agent to the oxidizing agent is complicated.

The purpose of the present invention is to provide an injection nozzle for metal combustion that can eliminate the above-mentioned drawbacks, and its features include a closing member that closes the nozzle of the injection nozzle from the outside, and an inlet inside the injection nozzle. This is because an active gas enclosure device was installed.

In this case, the nozzle closing member can reliably prevent molten metal from entering the injection nozzle, and by providing the nozzle closing member, it is possible to seal inert gas in the supply pipe, and the oxidizing agent can be Inert gas can be ejected from the nozzle prior to the injection.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing an embodiment of the injection nozzle according to the present invention.

In the figure, 1 is a combustion chamber, 2 is a wall surface of the combustion chamber 1, and 3 is molten metal accommodated in the combustion chamber 1. Further, reference numerals 4 to 8 and 12 indicate the same members as in FIG. 1 showing the conventional example.

A cap 21 made of thin metal, ie, a closing member, is attached to the tip of the nozzle body 4, and low-temperature solder 22 or the like is poured onto the contact surface for gas sealing. A coupling 23 is connected to the oxidizer supply line via a one-way valve 12, by means of which it is possible to connect to an inert gas supply source (not shown).

The functions and effects of the above configuration will be described.

Inert gas is supplied into the system at a predetermined pressure from an inert gas cylinder (not shown) via the coupling 23 into the pipe line and the injection nozzle 4 through the one-way valve 12, the one-way valve 8, and the cap 21. Enclosed. After sealing, the coupling ring 23 is separated from the inert gas cylinder, and the combustion device can be safely left or stored until the desired combustion start time.

As mentioned above, when the metal 3 in the combustion chamber 1 melts prior to the start of combustion, the cap 21 at the tip of the injection nozzle 4 easily reaches the same temperature as the molten metal 3, so the low temperature solder 22 melts. Upon melting, the cap 21 becomes separable from the injection nozzle 4.

The oxidizing agent cutoff valve 6 opens with an appropriate time delay after the start of melting of the metal 3, and after the pressure is reduced by the pressure regulating valve 7, the oxidizing agent is introduced into the pipe line filled with inert gas via the one-way valve 8. begins. Since the adjusted pressure of the oxidizing agent is sufficiently higher than the sealing pressure of the inert gas, the introduced oxidizing gas advances in the pipe toward the injection port of the injection nozzle 4 while compressing the inert gas. When the internal pressure rises to a certain degree, the low-temperature solder 22 of the cap 21 has already melted and loosened, so it falls out of the nozzle due to the pressure difference between the inside and outside, and from the nozzle first inert gas and then oxidizing agent are spouted into the molten metal 3. and combustion begins. In the method in which the cap 21 is dropped by differential pressure, the amount of gas blown out immediately after the cap 21 falls off is considerably larger than that in a steady state.

Therefore, the fact that the gas at this time is not an oxidizing agent but an inert gas has a great effect on stable passage through the transient combustion state. In this way, it is possible to prevent the injection nozzle from clogging and to ensure stable passage in the initial stage of combustion without having to use two gas systems.

FIG. 3 shows another embodiment according to the invention. The cap is replaced by a plug 31, and its functions and effects are the same as those of the previous embodiment.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a conventional metal combustion device, Fig. 2 is a sectional view showing an injection nozzle for metal combustion according to one embodiment of the present invention, and Fig. 3 is a sectional view showing another embodiment of a metal combustion injection nozzle according to the present invention. FIG. 3 is a cross-sectional view showing the main parts of the injection nozzle. 4... Injection nozzle, 21, 31... Cap,
12...One-way valve, 23...Couple ring.

Claims (1)

[Scope of utility model registration request] A metal combustion injection nozzle that injects and burns an oxidizing agent into molten metal in a combustion chamber is provided with a closing member that closes the nozzle of the injection nozzle from the outside and an inert gas filling device into the injection nozzle. An injection nozzle for metal combustion characterized by: