JPS6138408B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention purifies and renders harmful gases harmless by using a test gas such as a simulated gas having the same composition as harmful gases such as automobile exhaust gas and exhaust gas from various combustion equipment. This invention relates to a catalytic reaction test furnace for investigating characteristics such as reaction efficiency, reaction rate, reaction initiation temperature, etc. of a catalyst.

In this type of catalytic reaction test furnace, the test gas introduced into the test path is heated in a heating furnace from a low temperature below the catalytic reaction initiation temperature to achieve the same conditions as when applied to actual harmful gases. However, since conventional test reactors had a structure as shown in Figure 4, when replacing catalyst a, it was necessary to remove fasteners b such as bolts and nuts. When the holder c is separated from the test furnace body d, stop the supply of the test gas to prevent the high temperature test gas from blowing out, or stop the operation of the heating furnace e and wait until the furnace e cools down. The need arose.

For this reason, the catalyst cannot be replaced quickly, and the heating furnace e
When cooled, it takes time for the temperature to rise, so it takes a considerable amount of time to repeat numerous tests and obtain a large amount of data.

In particular, when the supply of the sample gas is stopped and the catalyst a is replaced, when the next catalyst a is set and the supply of the sample gas and the operation of the heating furnace e are restarted, the mixed state of the sample gas changes. There is a risk that the temperature of catalyst a may rise while the concentration and composition are poor. It was necessary to restart the operation of furnace e.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to shorten the time required to replace the catalyst.

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

A is a catalyst consisting of a cylindrical test reactor body 3 fixed to a base 2 via a stay 1 which also serves as a protective cover, and a catalyst holder 4 separably provided at one end of this test reactor main body 3. The reaction test furnace B is a heating furnace, and is designed to heat a large flow rate of diluent gas sent into the mixing chamber 6 through a pipe 5.
Then, a simulated gas as a test gas is prepared by mixing a diluent gas with a highly reactive component gas such as NO, which is sent from the pipes 7 and 8 to the vicinity of the outlet of the mixing chamber 6.

The catalyst holder 4 is simply pressed against the lower flange 3a of the test reactor body 3 from below, and the lever 9 pivoted on the base 2 is moved from the solid line position to the imaginary line position in FIG. By pushing down, the catalyst holder 4 is lowered and separated from the test reactor main body 3. 10 is a metal O-ring that ensures airtightness between the lower surface of the lower flange 3a and the upper surface of the catalyst holder 4 facing it, 11 is an adjuster star, 12 is a lock nut, and 13 is a hole for an elevation guide provided in the base 2. It is.

14 is a catalyst loaded in a catalyst case 15, and a conical slope 1 is formed on the inner surface of the lower end of the catalyst case 15.
5a, while on the top surface of the catalyst holder 4,
A tapered protrusion 4a that tightly fits on the slope 15a is provided so that when replacing the catalyst 14, the catalyst case 1
5 can be separated from the catalyst holder 4 with a single touch operation. In addition, the slope 15a on the inner surface of the lower end of the catalyst case 15 and the tapered protrusion 4a of the catalyst holder 4 are designed to prevent leakage through precise machining or grinding, and the catalyst case 15 is tested. It also serves as a positioning tool to be attached to the center axis of furnace A.

A flow path 16 serving as a test gas introduction path connecting the mixing chamber 6 and the catalytic reaction test furnace A is equipped with a suction device (e.g. A gas release line 8 is provided with a suction pump) 17, and the stay 1 is provided with an arm 19 fixed to the catalyst holder 4.
By providing a micro switch 20 that can be turned on and off and separating the catalyst holder 4 from the test reactor body 3, this micro switch 20 can be turned on and off.
However, the suction device 17 is configured to operate.

In the figure, 21 ₁ , 21 ₂ , 21 ₃ are temperature sensors,
22 is a differential pressure measuring tube, and 23 is an outlet for the gas that has passed through the catalyst holder 4 from the catalyst 14.

According to the above embodiment, when performing a reaction test of the catalyst 14, the high-temperature simulated gas flows from the top to the bottom of the test furnace A, as shown in FIG. 3A, but when the catalyst 14 is replaced, When the catalyst holder 4 is lowered, the suction device 17 is activated, so that the high temperature simulated gas is sucked into the gas release line 18 as shown in FIG. As shown, the atmosphere is sucked into the test reactor main body 3 from the open lower end of the test reactor main body 3, flows into the gas relief line 18 together with the simulated gas, and flows into the test reactor A.
will be cooled down.

Therefore, there is no need to stop the operation of the heating furnace B or the supply of the simulated gas, the catalyst 14 can be replaced in a short time, and the next test can be started promptly.

Since the catalyst holder 4 is separated by engaging the lever 9, the catalyst holder 4 can be easily and quickly separated, and the catalyst case 15 can be attached and detached from the catalyst holder 4 with a one-touch operation. This can be done quickly by

The illustrated catalyst holder 4 is divided into an upper half having a tapered protrusion 4a and a lower half having a gas outlet 23 for ease of processing, and these are integrally connected by bolts 24. However, it is also possible to form it as a single piece. Also, the catalyst 14
The structure may be such that the position of the catalyst 14 can be changed and adjusted (for example, by replacing the catalyst holder 4) in order to adjust the distance between the upper surface of the catalyst 14 and the temperature sensor ₂₁₂ . The suction device 17 can also be activated manually when the catalyst holder 4 is separated. The means for attaching and detaching the catalyst holder 4 may also be bolts and nuts, as in the conventional test furnace shown in FIG.

As is clear from the detailed description above, the catalytic reaction test reactor according to the present invention is provided with a separable catalyst holder for the test reactor main body to which the test gas is fed through the test gas introduction path. In the catalytic reaction test reactor, the gas release device is equipped with a suction machine that has a suction capacity for a larger flow rate than the amount of test gas to be supplied to the test reactor main body from the test gas introduction path provided in the test reactor main body. It has the feature of deriving lines. Therefore, when separating the catalyst holder from the test reactor body and replacing the catalyst, it is possible to replace the large suction device without stopping the supply of the test gas or the operation of the preheating device for the test gas. The suction force not only completely stops the flow of the test gas into the test reactor main body, but also prevents air from outside from entering the test reactor main body from the open end of the test reactor main body from which the catalyst holder is separated. Since the test reactor body is cooled down in a short time by suction, the catalyst can be easily replaced in a very short time, and the next test can be started immediately. In addition, as mentioned above, there is no need to stop the supply of the test gas or the operation of the preheating device for the test gas, etc.
There is almost no need to wait for the temperature of the equipment to rise or the conditions of the sample gas to settle during the next test.
This method has the excellent effect of being able to test a large number of catalysts in a very short time and with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention;
FIG. 2 is an enlarged view of the main parts of the same as above, FIG. 3 A and B are operational views of the same, and FIG. 4 is a longitudinal sectional view showing a conventional example. A...Catalytic reaction test furnace, 3...Test reactor body, 4
...Catalyst holder, 17...Suction machine, 18...Gas escape line.

Claims (1)

[Claims] 1. Provide a test gas introduction path at one end of the test furnace body,
A catalyst holder that holds the catalyst case inserted into the test reactor main body is separably attached to the other end of the test reactor main body, and the test gas supplied into the test reactor main body from the test gas introduction path is transferred to the catalyst holder. In a catalytic reaction test reactor configured to discharge from the side end, a gas relief line equipped with a suction device having a suction capacity of a larger flow rate than the amount of sample gas to be fed to the test reactor main body is connected to the gas release line. A catalytic reaction test reactor characterized by being derived from a test gas introduction path.