JPS60206434A - Aerosol generation apparatus - Google Patents

Abstract

PURPOSE:To enhance operation efficiency, in an apparatus for generating a Na- aerosol, by communicating a natural mixing chamber with a reaction chamber and mounting a pressure regulation chamber and a reaction gas supply apparatus to the natural mixing chamber. CONSTITUTION:Solid Na is put in an evaporation chamber 11, and melted and raised in its temp. by a heater 17 to form a high temp. Na-liquid 27 and Na- vapor is generated. A N2-gas supply valve 19 is opened to supply heated N2-gas and a ball valve 12 is further opened to send reaction gas containing Na-vapor into a reaction chamber 14 while gaseous mixture consisting of N2-gas, O2-gas and moisture is sent into said reaction chamber 14 through a reaction gas supply valve 20. Na-vapor, O2 and H2O are stirred and reacted in the reaction chamber 14 to form a Na-aerosol. The gas containing the Na-aerosol is mixed in a natural mixing chamber 15 and held under a constant condition before being sent to a testing part.

Description

[Detailed description of the invention] The present invention relates to improvements in aerosol generators.

When conducting aerosol research through experiments.

A device that generates an aerosol is required. A conventional aerosol generator, for example, an aerosol generator, has a structure as shown in FIG. In Figure 1, high temperature N
A saucer 2 for a is provided and contains high temperature Na 3 f.

The upper Vc of the high-temperature Na saucer 2 is the Na inserted from the outside.
An injection pipe 4 is provided. ΩIJ distribution temperature N a 3
At the liquid level, Na is the oxygen in the atmospheric gas.

Combustion occurs when it reacts with moisture. The Na aerosol generated by this combustion is naturally stirred within one reaction chamber 1. Further, the gas containing the Na aerosol is delivered to the test target area via the aerosol discharge valve 5, and an experiment regarding the aerosol is conducted. In addition, in order to control the pressure inside the reaction chamber l, an atmosphere discharge gas supply valve 6 is used to supplement the amount of gas sent to the test target part via the aerosol discharge valve 5f.
Atmospheric gas, tight N, 0. A mixed heating gas of H2O and H2O is supplied.

As a Na aerosol generator, the temperature is constant.

Ideally, it would be possible to stably supply Na aerosol at a constant pressure and temperature. However, the conventional l'
In the Ja aerosol generator, when Na is burned at the high-temperature Na3 liquid level, even if a small portion of Na oxide, which is one reaction product, is released into the gas, the majority of the reaction products are not released at the liquid level. It becomes a floating state. Therefore, if the combustion of Na continues, one reaction product accumulates on the liquid surface, and this
As the reaction between a and oxygen is inhibited, as one hour passes,
The combustion rate of Na gradually decreases. Therefore &Na
This makes it impossible to release the aerosol into the atmospheric gas at a constant rate, making it difficult to maintain the S degree condition of the Na aerosol constant. Further, as described above, since the combustion rate of Na changes, the combustion heat generated also changes. For this reason, it is extremely difficult to control the temperature inside the reaction chamber J, which has good airtightness. Similarly.

Since the generation of &Na aerosol decreases as the Na combustion rate decreases, supplying a constant amount of gas from the atmospheric gas supply valve 6 changes the pressure inside the reaction chamber 1 and increases the
This will further reduce the aerosol concentration of a. As described above, with the conventional Nix aerosol generator, it is extremely difficult to stably supply a gas containing Na aerosol at a constant concentration, constant pressure, and constant temperature for a long period of time.

In addition, since the reaction is inhibited by the reaction products floating on the liquid surface, the overall combustion efficiency of the high Na3 is poor. Since the injection pipe 4 is required, the entire device becomes large-sized and is not economically efficient.

Furthermore, since one reaction is inhibited δ, the Na combustion reaction ends quickly, and the device must be disassembled each time, and the Na deposited on the high-temperature Na receiver 2 and various parts of the reaction chamber 1 must be cleaned frequently. , the experimental operation efficiency becomes extremely poor.

The present invention was made to eliminate the above-mentioned drawbacks, and it is capable of stably supplying gas containing aerosol at a constant concentration, constant pressure, and constant temperature for a long time, has high experimental operation efficiency, and is compact and inexpensive. Aerosol generator
fi't - that which is intended to be provided.

The aerosol generating device of the present invention has a habit generation chamber.

A reaction chamber connected to the evaporation chamber via a valve, a natural mixing chamber connected to the reaction chamber, a pressure adjustment chamber connected to the natural mixing chamber, a reaction gas supply device connected to the reaction chamber, and all equipment. It is characterized by the fact that

In such an aerosol generator, an alkali metal such as Na is evaporated in an evaporation chamber.

Since an aerosol is generated by a gas phase reaction with the reaction gas supplied from the reaction gas supply device in the reaction chamber, the reaction efficiency is high and the apparatus can be downsized. In addition, since a pressure adjustment chamber connected to the natural mixing chamber is provided, the aerosol Im[.

Pressure and temperature can be easily kept constant.

Furthermore, since reaction products do not accumulate in the evaporation chamber,
Less complicated work such as cleaning υ.

Experimental operation efficiency increases.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, the evaporation chamber 1) is connected to the reaction chamber 4 through a pipe J3 having a Pall valve 12 interposed therein. This reaction chamber J4 communicates with the natural mixing chamber J5. These evaporation chambers 11. The pie 1J3° reaction chamber J4 and the natural mixing chamber 15 are covered with a heat-insulating scoop 16. Further, a heater 17 is provided around the evaporation chamber 1 and the pipe 13, and a heater 18 is provided around the natural mixing chamber 15. A heated N2 gas is supplied to the evaporation chamber 1 through a gas supply valve J9. Further, a reaction gas supply device 2 is connected to the 1rIJ period reaction chamber 14 via a reaction gas supply valve 2o.萱・The natural mixing chamber 15 is equipped with an aerosol discharge valve 2.
2 is provided. Further, a pressure adjustment chamber 24 is connected to the natural mixing chamber 15 through a pipe 23.

This pressure adjustment chamber 24 includes a pressure adjustment valve 25 that supplies nitrogen and gas, and a pressure adjustment valve 2 that discharges gas in the pressure adjustment chamber 24.
6 is provided. In addition, it is desirable that the volume of the pressure adjustment chamber 24 and the valley gutter of the natural mixing chamber 15 be made considerably large. Furthermore, instruments (not shown) are attached to the natural mixing chamber 15 to measure the concentration, pressure, and temperature of the atmospheric gas.

A case in which Na aerosol is generated using the aerosol generator i will be described. A solid Na block is placed in the evaporation chamber 11, or an appropriate amount of liquid Na' is injected from a temporary injection pipe (not shown), and the N is heated by the heater 17.
af Melt and raise the temperature to form a high-temperature Na liquid 27, and further generate Na vapor. Open the N3 gas supply valve 19 to supply sufficiently heated N gas, and then open the ball valve 12 to send the gas containing Na vapor into the reaction chamber 14. During this time, N
The steam a is heated to a maximum of about 600'C by the heater 17 to prevent the temperature from dropping. On the other hand 1
From the reaction gas supply device 1121 to the reaction gas supply valve 20t-
N2 gas, 0. A gas containing a mixture of gas and water (HlO) in an arbitrary ratio is sent into the reaction chamber 14. The Na vapor and Ol and H,0 are stirred and reacted in the reaction chamber 14,
Na aerosol is generated. The gas containing the Na aerosol is mixed in the natural mixing chamber 15. During this time, the aerosol discharge valve 22ff is initially closed, and the heater 17,
By controlling the gas flow rate from the 8.6 valve and the pressure control valves 25 and 26'ff installed in the pressure adjustment chamber 24, the concentration of Na aerosol in the natural mixing chamber 15, the pressure of the atmospheric gas, and the degree of IA are controlled. hold until it becomes constant. In this state, the aerosol discharge valve 22 is opened and gas containing a predetermined aerosol is sent to the test target area.

According to the above aerosol generator.

Since the Na vapor generated in the evaporation chamber 11 and the reaction gas supplied from the reaction gas supply device @2 are subjected to a gas phase reaction in one reaction chamber 14, the efficiency of one reaction is high.

Therefore, even a very small device such as the evaporation chamber 11 can be used efficiently.
Na aerosol can be supplied.

Furthermore, until the gas containing Na aerosol is sent to the test target area, the Na aerosol concentration, pressure, and temperature of the atmospheric gas are controlled while the mixed gas is flowing into the pressure adjustment chamber 24, which has a larger volume than the natural mixing chamber 15. Since it can be easily adjusted, experiments can be conducted under constant conditions immediately after the arosol discharge valve 22 is opened. Also, natural mixing room 1
5 and the pressure stripe chamber 24, when it takes time for the atmospheric gas to reach a steady state,
Since the pressure can be adjusted in the natural mixing chamber J5, which has a smaller volume than the pressure adjustment chamber 24, the steady standby time is shortened.

Furthermore, since reaction products do not accumulate on the surface of the high-temperature Na solution 27 in the evaporation chamber 11, complicated operations such as cleaning can be done in one step.
This is completely unnecessary, and the efficiency of experimental operation can be increased.

Note that a pipe 13 connecting the evaporation chamber J and the reaction chamber 14
is heated by heater J7 to prevent temperature drop while the Na vapor is moving, and Na vapor and N are in the pipe J3.

Since only gas is present, blockages due to l'Ja mist that often occur in narrow pipes can be completely avoided.

As detailed above, according to the present invention, the concentration is constant.

Gas containing aerosol at a constant pressure and temperature for a long time.
It is possible to provide a compact and inexpensive aerosol generator that can provide a stable supply, has high experimental operation efficiency, and is also compact and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional aerosol generator. FIG. 2 is a configuration diagram of an aerosol generator according to a second embodiment of the present invention. 1 No... Evaporation chamber, 12... Ball valve, 13... Pipe, 44... Reaction chamber, 15... Natural mixing chamber, 16
... Keep warm If)! , t7,1B...Heater, 19.
...N, gas supply valve, 20...reaction gas supply valve, 21
...Reaction gas supply bag @, 22...Aerosol discharge valve, 24...Pressure product adjustment chamber, 25.26...Pressure control valve, 27...High temperature Na liquid.

Claims (1)

[Claims] an evaporation chamber, a reaction chamber connected to the evaporation chamber via a valve, a natural mixing chamber connected to the reaction chamber, a pressure adjustment chamber connected to the natural mixing chamber, and a reaction gas supply connected to the reaction chamber. An aerosol generating device characterized by comprising: