JPH0599564A - Gas purifying device - Google Patents

Abstract

PURPOSE:To provide a gas purifying device without leakage of fine powder of a filler from a gas effluent side even in the case where it is used under greater vibration and acceleration. CONSTITUTION:There is provided a gas purifying device wherein fillers 41, 42 for purification of gas to be processed are held between holding plates 46, 47 having a pair of filters in a purifying device casing 45 in the state that the filters are shielded with respect to the purifying device casing 45, and wherein a flow passage of the gas is formed from the filter-equipped holding plate 46 in the direction of the filter-equipped holding plate 47. The filter- equipped holding plate 47 is fixed to the purifying device casing 45, and the filter-equipped holding plate 46 is provided slidably to the purifying device casing 45 along the flow passage. Further, there is provided energyzation means 48 for energyzing the filter-equipped holding plate 46 in a direction where the fillers are pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas purifier, and such a gas purifier is used, for example, in a helium gas liquefier.

[0002]

2. Description of the Related Art The structure of a gas refining apparatus will be described in more detail. Conventionally, such a gas refining apparatus has a pair of filters which are disposed in the refining apparatus casing in a sealed state with respect to the refining apparatus casing. A filler for purifying the gas to be treated is held between the holding plates, and a flow path for the gas to be treated is formed from one holding plate with a filter to the other holding plate with a filter. In this apparatus, the gas to be treated flows into the filler portion from one filter holding plate side, undergoes a predetermined treatment in this filler portion, and flows out from the other filter holding plate side. Here, the gas flowing out is subjected to a refining process to be made clean. Further, the seal structure between the holding plate with filter and the purifier casing is a structure required so that gas and other impurities do not leak from the gap between the two. Most of the conventional gas purifiers are of the stationary type, and many of them have the configuration shown in FIG. 3, and no on-vehicle type gas purifier that is affected by large vibrations and accelerations has been developed. It was

[0003]

However, there is a case where this device is installed and used in a situation where a gas purification device such as a linear motor car, rocket, automobile, or the like is subjected to a large vibration or acceleration. In such an environment, when a gas purifier with a conventional configuration is used, the catalyst, the adsorbent, and other fillers filled in the purifier move due to vibration and acceleration, and the packing density is Changes and creates voids in the device. And when this happens,
Between the fillers or between the filler and the equipment casing, the relative movement of the fillers causes mutual destruction due to wear and collision, and a part of the filler is pulverized and leaks from the gas purification equipment together with the gas to be treated. There was a problem. For example, when the gas refining device is used for a helium gas liquefaction device mounted on a linear motor car, the above problem is severe. Vibration / acceleration in a linear motor car is vibration frequency 300Hz, dynamic acceleration 10G
It extends to. In this situation, partial pulverization of the filler is significant, and the fine powder generated enters the circulation refrigeration system of the helium gas liquefaction device from the gas purification device. In such a case, there is a problem that the device cannot operate normally.

An example of such fine powder leakage is shown below. Device configuration: Gas purification device shown in FIG. 3 (fixed holding plates with filters arranged on both sides of the packing material) Packing volume 140 cc Filler shape; Granular packing rate (bulk density) 0.71 cc / g , 1.25
cc / g Filler Physical adsorbent, Chemical adsorbent Operating environment; Frequency 300Hz, Dynamic acceleration 10G

[0005]

[Table 1]

The number of leaking fine powders in the presence of vibration is abnormal, and such a situation is almost unacceptable. Therefore, an object of the present invention is that even when it is used in a situation where it is subjected to a large vibration / acceleration operation, the mutual movement of the filler is unlikely to occur, and the filler is not pulverized, and a certain amount of fine powder is produced. In the case of the above, it is also possible to obtain a gas purification apparatus in which this fine powder does not leak out together with the gas to be treated from the gas outflow side.

[0007]

To achieve this object, the gas purifier according to the present invention is characterized in that the other holding plate with a filter is fixed to the purifier casing,
One holding plate with a filter is provided slidably with respect to the purifier casing in the direction along the flow passage,
There is an urging means for urging one of the holding plates with a filter in the direction of pressing the filler, and the action and effect are as follows.

[0008]

In this gas purifying apparatus as well, the filler is sandwiched and held between the one holding plate with the filter and the other holding plate with the filter, and one of the filters located upstream of the gas flow. The attached holding plate is configured to be slidable with respect to the refiner casing, and the biasing means presses the filler. Therefore, even if the gas purifier is subjected to a large acceleration operation or vibration and the filler is moved inside the device, this movement is absorbed by the movement or adjustment of one of the holding plates with a filter in the pressing direction. It will be. Therefore, even if the filler is subjected to vibration or the like, it is maintained in the most stable filled state, and the powdering of the filler is suppressed. On the other hand, even if a certain amount of fine powder is produced, this fine powder will be held in the refining device by the other holding plate with a filter and the seal structure between the other holding plate with a filter and the purifying device casing.

[0009]

Therefore, even when the filler is used in a situation where it is subjected to a large vibration / acceleration operation, the mutual movement of the filler hardly occurs, and the filler is not pulverized, and a certain amount of fine powder is produced. Also in this case, it was possible to obtain a gas purification apparatus in which this fine powder did not leak from the gas outflow side together with the gas to be treated (see the experimental example shown in the examples).

[0010]

Embodiments of the present application will be described with reference to the drawings. FIG. 1 shows the configuration of a helium gas liquefaction device 1 mounted on a linear motor car that employs the gas purification device of the present application. This helium gas liquefaction device 1 is connected to a helium circulation system 100, a gas compressor 2 and a discharge side of the gas compressor 2, and is equipped with the following devices and connected to the suction side of the gas compressor 2 described above. Gas passage 3, room temperature refining device 4,
Heat exchanger 5, low temperature purification device 6, Joule Thomson valve 7,
The liquid helium tank 8 is provided. Here, the gas compressor 2 pressurizes the helium gas to a state required for liquefaction. The heat exchanger 5 is the gas compressor 2
The gas g1 on the outward path from the liquid helium tank 8 to the gas compressor 2 on the return path from the liquid helium tank 8 to the gas compressor 2 is heat-exchanged to cool it. It is provided with steps. Further, in the intermediate stage between the heat exchangers 5 described above, the gas is cooled by the refrigerator 9 respectively, and the gas is cooled to a predetermined temperature (70 K in the stage between the first stage heat exchanger 51 and the second stage heat exchanger 52). degree,
It is about 20K in the stage between the third stage heat exchanger 53 and the fourth stage heat exchanger 54). In addition, the low temperature purification device 6 described above is provided between the first stage heat exchanger 51 and the second stage heat exchanger 52 and between the third stage heat exchanger 53 and the fourth stage heat exchanger 54.
Is provided, and the liquefied impurity component in each device 6 is removed. On the other hand, a helium gas supply system (including a helium cylinder 10 and a supply gas purifier 11) 101 for supplying or replenishing helium gas is provided for the circulation system 100.

The structure for purifying helium gas will be described below. The parts that fulfill this function are the above-mentioned room temperature refining device 4 and low temperature refining device 6. Here, these operating temperatures are the so-called normal temperature of the room temperature refining device 4 and the low temperature refining device 6
It is about 70K and about 20K. Now, the room temperature refining apparatus 4 is constructed by accommodating the chemical and physical adsorbents 41 and 42 in this order. As the chemical adsorbent 41,
50% to 75% by weight of nickel oxide (NiO) and 2
5-50% aluminum oxide (Al ₂ O ₃₎ is and the adsorbent is employed as a main component, as a physical adsorbent 42,% by weight 25% to 45% of aluminum oxide (Al ₂
O ₃ ), molecular sieves containing 35 to 55% of silicon oxide (SiO ₂ ) and 10 to 30% of sodium oxide (Na ₂ O) as main components are adopted. As the particle size of the molecular sieves, a size suitable for adsorption removal is selected. Here, the shape of the chemical adsorbent 41 was spherical.

Impurities to be removed by the purifiers 4 and 6 will be described. In the room temperature purifier 4, oxygen, carbon monoxide,
Targeting carbon dioxide, water, hydrogen, etc., low temperature purification device 6
Then, nitrogen, methane, carbon dioxide, and water are targeted for removal.
In this structure, the low temperature refining device 6 is installed near the refrigerator, and the volume allowed for the low temperature refining device 6 is small. Therefore, since the adsorption capacity that can be assigned to the purifier 6 (basically the capacity limit because the volume of the adsorbent is limited) is limited, impurities other than nitrogen and methane in the ambient temperature purifier 4 are limited. It is necessary to remove as much as possible.

Next, the configurations of the room temperature refining apparatus 4 and the low temperature refining apparatus 6 as the gas refining apparatus will be described with reference to FIG. The dimensions of normal temperature and low temperature refining equipment are different. In this apparatus, the gas to be treated flows in from the gas inlet 43 on the left side in the figure, and the gas flows out from the gas outlet 44 at the right end after being subjected to the adsorption treatment. The apparatus is a purifier container 4 as a cylindrical purifier casing.
Although the adsorbents 41 and 42 as a filler are housed in the container 5, the adsorbents 41 and 4 are contained in the container 45.
2 is sandwiched from both ends thereof by an inflow side holding member 46 as one holding plate with a filter and an outflow side holding member 47 as another holding plate with a filter. These sandwiching members 46, 47 are used as adsorbents 41, 42
Glass wool layers 46a, 47a, metal filters 46b, 47b made of stainless steel, and metal holding plates 46c, 47c are provided from the side close to. Here, the metal filters 46b and 47b and the metallic holding plates 46c and 47c
The peripheral ends of the filters 46b and 47b are welded and fixed. The reason why the glass wool layers 46a and 47a are provided is that it is difficult to capture 100% of the particles with the metal filters 46b and 47b alone. Therefore, by forming the glass wool layers 46a and 47a, the capture rate of particles is increased. Further, the inflow side holding member 4
The metal holding plate 46c of 6 is configured to be slidable in the gas flow direction together with the metal filter 46b fixed thereto, and the gas inflow side (non-adsorbent side) of the metal holding plate 46c is a spring 48 as an elastic member. Elastically retained. On the other hand, in the outflow side holding member 47, the metallic holding plate 47a
The peripheral portion on the outflow side of is fixed to the refiner container 45 by welding. By adopting this structure, even when fine powder of the adsorbents 41 and 42 stored due to vibration is generated,
The fluidization due to the vibration of the adsorbents 41 and 42, which are the filling materials,
This is prevented by the inflow side holding member 46, the generation of the fine powder itself is suppressed, and the fine powder is reliably captured, so that the fine powder is not mixed in the circulation system 100.

[Experimental Example] In order to confirm the effect of adopting the gas purifying apparatus having the above-described structure,
The amount of fine powder generated without vibration was measured with a particle counter. The data are shown in Table 2. Device configuration: Gas purification device shown in FIG. 2 Filling volume 140 cc Filler shape Almost spherical Filler filling rate (bulk density) 0.71 cc / g, 1.3 c
c / g Filler Physical / Chemical adsorbent Usage environment: Frequency 300Hz, dynamic acceleration 10G

[0015]

[Table 2]

As shown in Table 2, when comparing the case where there is vigorous vibration and the case where there is no vigorous vibration, it can be seen that the number of leaks of the fine powder to the outside of the refining apparatus is not so large for vigorous vibration. Further, even when compared with the results in Table 1, good results are obtained.

[Other Embodiments] In the above embodiment, an example in which the gas purification device of the present application is adopted in the helium liquefaction device used in the linear motor car is shown, but it is applied to a rocket with a large acceleration, an automobile, etc. It can be applied to various applications such as the exhaust gas treatment device mounted on the vehicle.

Further, in the above-mentioned embodiment, the structure in which the inflow side holding member 46 is pressed by the spring 48 is shown, but any structure such as an air damper structure can be adopted. Therefore, this device is called a biasing means.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a helium freeze liquefaction device of the present application.

FIG. 2 is a cross-sectional view of a gas purification device.

FIG. 3 is a block diagram of a conventional refining device

[Explanation of reference numerals] 41 packing material 42 packing material 45 refining device casing 46 holding plate with one filter 47 holding plate with the other filter 100 helium circulation system

Claims (3)

[Claims] 1. A pair of holding plates with a filter (46) disposed inside the refining device casing (45) in a sealed state with respect to the refining device casing (45),
A filler (41) for purifying the gas to be treated between (47),
(42) and holds one of the holding plates with filter (4
6) A gas purifying device in which a flow passage for the gas to be treated is formed in the direction from the other holding plate with filter (47) to the other holding plate with filter (47). ), The one holding plate with a filter (46) is slidably provided with respect to the refiner casing (45) in the direction along the flow passage, and the one holding plate with a filter is provided. A gas purification device provided with a biasing means (48) for biasing the plate (46) in the direction of pressing the filler. 2. The other holding plate with a filter (47)
The metal holding plate (47b)
The gas purifier according to claim 1, which is welded and fixed to c), and further, the metallic holding plate (47c) is welded and fixed to the refiner casing (45). 3. Gas purifier according to claim 1, wherein the filler (41) is spherical.