JPH1130404A - Multi-purpose sodium combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fire extinguishing training by arranging a suction port of the aerosol to be generated in the vicinity of an upper side surface of a metallic sodium combustion surface in a combustion chamber so as to surround the periphery of the combustion surface, and installing a combustion pan and dry sand on the combustion part to directly observe the combustion surface. SOLUTION: A heater 6 raises the temperature of metal sodium to be burned so as to be naturally ignited. Dry sand 5 traps a combustion pan into the dry sand 5 even when the combustion pan is melted by the combustion of metal sodium, and prevents the leakage of the melted pan outside. The generated aerosol is led to a collection device through an exhaust dust 3 together with the air in the combustion chamber from a suction port 4 in the vicinity of the combustion by starting a suction fan of an aerosol collection and exhaust device provided outside a combustion chamber. The suction port 4 provided in a steel exhaust duct 2 is the wider toward the upper part from the combustion surface. The gas above the combustion surface is sucked as the downward flow, the rise of aerosol is suppressed so that the aerosol efficiently flows into the exhaust duct 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus which can safely incinerate while observing a combustion surface of metallic sodium in situ. More specifically, the present invention relates to a multipurpose metallic sodium combustion apparatus that can be used for direct observation of the combustion process of metallic sodium, fire extinguishing training, behavior evaluation study of aerosol generated by combustion, and the like. INDUSTRIAL APPLICABILITY The present invention is effective as a fast reactor using metallic sodium as a coolant, or as a combustion facility for waste metallic sodium discharged in a test and study using metallic sodium, as a facility for studying metallic sodium combustion, and as a training facility for operators.

[0002]

2. Description of the Related Art FIG. 4 shows an example of the prior art. The apparatus for burning metallic sodium includes a combustion chamber 11 and a recovery and exhaust device 17 for collecting sodium oxide aerosol generated by combustion. The combustion chamber 11 and the aerosol recovery device 17 are connected by a steel smoke tube 3. The aerosol recovery device is provided with a filter 15 therein, and the aerosol collected by dropping water 16 into the filter portion is dissolved in water. The water in which the aerosol is dissolved is strongly alkaline water 18, which is neutralized with acid and drained safely.

[0003]

However, in the above-mentioned conventional metallic sodium combustion apparatus, a smoke tube is provided so as to cover the combustion surface of metallic sodium in the combustion chamber from the upper side with a hood, so that aerosol generated by combustion is removed. Although it can be guided to the recovery device without fail, it has a drawback that it is difficult to directly observe the combustion process or to conduct fire extinguishing training by spraying a digestive agent.

[0004] An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to more reliably guide the aerosol generated by combustion to a recovery device, to directly observe the combustion surface of metallic sodium, and to easily extinguish a fire extinguisher. It is an object of the present invention to provide a multipurpose sodium combustion apparatus which enables fire-extinguishing training of spraying.

[0005]

The multipurpose sodium combustion apparatus according to the present invention has a structure in which an intake port for collecting and exhausting aerosol generated near the upper side surface of the metal sodium combustion surface in the combustion chamber is arranged. The combustion part of metallic sodium is equipped with a steel combustion dish and a dry sand under the combustion dish in case of melting. The aerosol intake port on the combustion surface is a metal duct, which is arranged so as to surround the periphery of the combustion surface of metallic sodium, and is connected to an aerosol collection and exhaust device via a smoke tube.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a metallic sodium combustion section of a multipurpose sodium combustion apparatus according to the present invention, and FIG.
Is a longitudinal sectional view, and FIG. 3 is a conceptual diagram of installation in a combustion chamber. In this multipurpose sodium combustion apparatus, an aerosol intake port 4 is arranged so as to surround a side surface of a combustion plate 1 made of metallic sodium, and obstructions in a space above the combustion plate 1 are eliminated. The steel exhaust duct 2 provided with the aerosol intake port 4 is configured to be wider as it goes above the combustion dish 1 and to suppress the rise of the aerosol generated by inhaling the gas above the combustion surface together.

The combustion part of metallic sodium is a steel combustion dish 1.
Further, a heater 6 and a dry sand 5 are provided below the heater. The heater 6 is for raising the temperature of the metal sodium to be incinerated to spontaneously ignite. The dry sand 5 is confined in the dry sand 5 even if the combustion dish 1 is melted by the burning of metallic sodium, so that leakage to the outside can be prevented. The exhaust duct 2 is connected to an aerosol collection and exhaust device (not shown) by a smoke tube 3.

In the configuration of the combustion chamber in which the multipurpose sodium combustion apparatus is installed, as shown in FIG. 3, a steel liner 12 is installed on the inner surface of a combustion chamber 11 surrounded by reinforced concrete. On the floor of the combustion chamber 11, a multipurpose sodium combustion device is installed, and a raised floor 13 is provided.

Next, the operation of each part during the combustion of metallic sodium will be described with reference to FIG. The metal sodium 14 to be incinerated is placed on the combustion dish 1, and a heater provided on the lower surface of the combustion dish is energized to heat the combustion dish 1 and spontaneously ignite. The metallic sodium 14 hardly generates a flame at the time of combustion, and becomes 100 ° C. or less when 80 cm away from the combustion surface.
It is characterized by generating a large amount of aerosols of sodium oxide and sodium peroxide to emit white smoke.

The generated aerosol passes through the exhaust duct 3 together with the air in the combustion chamber from the intake port near the combustion by the activation of the intake fan of the aerosol collection and exhaust device provided outside the combustion chamber 11. Guided inside. As described above, since the intake port provided in the exhaust duct 2 is wider as it goes above the combustion surface, the gas above the combustion surface is sucked in as a downward flow, the rise of the aerosol is suppressed, and the efficiency of the exhaust duct 2 is reduced. It is set so that it can flow in.

Although the preferred embodiment of the present invention has been described in detail, the present invention is not limited thereto. In the above embodiment, the shapes of the combustion dish 1 and the exhaust duct 2 are shown as squares, but may be circular. In addition, although the upper part of the combustion surface is open, it can be covered with a lid of a glass dome having a top opening to further increase the safety of the training personnel.

[0012]

According to the present invention, the aerosol intake duct is disposed on the upper side surface of the combustion surface of metallic sodium as described above to prevent diffusion into the upper space. Workability is good, and multipurpose use such as direct observation of the burning process of metallic sodium and fire extinguishing training, and sampling of aerosol generated by burning, and behavior evaluation research are possible. Another advantage is that the conventional aerosol collection and exhaust device can be used as it is to change to a multipurpose sodium combustion facility simply by changing the layout of the exhaust duct.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a multipurpose sodium combustion apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view showing the internal structure.

FIG. 3 is a conceptual diagram showing a configuration of a conventional metal sodium combustion apparatus.

FIG. 4 is an operation conceptual diagram of the multipurpose sodium combustion apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Combustion dish 2 ... Exhaust duct 3 ... Smoke tube 4 ... Inlet
5 ... Dry sand.

Claims (2)

[Claims] 1. A steel exhaust duct connected to an aerosol collection and exhaust device is disposed near the upper portion of the periphery of a combustion dish of metallic sodium, and an intake port is provided on a side facing the combustion dish. Multipurpose sodium combustion device. 2. An exhaust duct disposed in the vicinity of a combustion dish, wherein a duct surface on a side facing the combustion dish is formed so as to be wider as it goes upward, and an intake port for aerosol is provided on a slope thereof.
A multi-purpose sodium combustion device as described.