JP2000321194A - Filter-testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high-temperature gas flow where an ultra-fine particle that is nearly equivalent to that being generated at an actual high-temperature gas furnace is carried. SOLUTION: A high-temperature nitrogen gas of a specific pressure is sprayed to silver being melted by a silver particle generator to allow a silver particle to fly, and the silver particle borne on a nitrogen gas flow is carried to a filter 81 for testing where a filter holder 6 is set and a rear-stage filter 82. In the filter holder 6, the inner diameter of a gas flow passage is gradually increased from the upstream side to the downstream and is throttled to a small diameter near the downstream for generating turbulence in the high-temperature gas flow, and at least a filter 81 for testing is set to the region where the turbulence cannot be extinguished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FP (FusionProducer) of silver (Ag), cesium (Cs), iodine (I) or the like.
The present invention relates to a filter test apparatus for performing a performance test of a filter for removing t) and carbon (C) as a constituent material of nuclear fuel.

[0002]

2. Description of the Related Art Recently, a high-temperature power generation system in which a high-temperature gas is generated in a high-temperature gas reactor including a nuclear reactor and a turbine is directly driven by the high-temperature gas to generate power has been studied. In this high-temperature power generation system, turbine equipment is contaminated at a high level due to the flying adhesion of the FP generated in the nuclear reactor, so that maintenance of the turbine equipment requires a great deal of time, expense, and risk. Be strong.

[0003] Therefore, a filter has been researched and developed which captures such FP on the upstream side of the turbine equipment and prevents flying adhesion to the turbine equipment. Then, a filter test apparatus for performing a performance test of the filter has been proposed.

In this filter test apparatus, fine particles equivalent to FP are put on a gas flow of a high-temperature gas and transmitted through a test filter, and the trapping rate of the fine particles in the filter is measured.

[0005]

However, as the fine particles in this filter test apparatus, silver, which is a kind of FP, is used, but a small amount of this silver is extruded from a cylinder by a plunger and put on a high-temperature gas flow. Therefore, it is difficult to extrude as ultra-fine particles, and the particles are shifted or aggregated, or adhere to the gas flow pipe wall surface, and further, clogging occurs and continuous supply cannot be performed. A filter test device could not be realized.

[0006] In addition, silver is put into a carbon container, melted and evaporated by high-frequency induction heating, and the evaporated silver is put on a cold gas stream (nitrogen). In this case, the evaporated silver is immediately crystallized. As a result, it became impossible to realize a good filter test apparatus.

[0007] The above problems are the same even when particles other than silver are used as the particles to be used.

[0008] An object of the present invention is to provide a filter test apparatus capable of obtaining a high-temperature gas flow carrying ultra-fine particles equivalent to super-particles generated in an actual high-temperature gas furnace, thereby enabling a good filter performance test. It is to provide.

[0009]

Means for Solving the Problems To solve the above problems, a first aspect of the present invention is a means for generating a gas flow having a predetermined pressure, and ultrafine particles generated in a pipe for transporting the gas flow. An ultra-fine particle generating means for placing the ultra-fine particle generator on the gas flow substantially uniformly, a filter holder in which a test filter is set downstream of a pipe of the ultra-fine particle generating means and a downstream filter is set downstream thereof, and the ultra-fine particle generating means And a first heating means for heating a pipe between the ultra fine particle generator and the filter holder to a predetermined temperature.

According to a second aspect of the present invention, in the first aspect, the ultrafine particle generating means includes a crucible means for enclosing silver, cesium, iodine, carbon, and other flying materials, and the crucible means is heated by heating the crucible means. Second heating means for melting the flying material, nozzle means for spraying the gas flow transported from upstream onto the flying material in the crucible means, and the gas blown by the gas flow in the crucible means And guide means for sending the ultrafine particles of the flying material downstream.

In a third aspect based on the second aspect, the crucible means is configured to be disassembled and assembled.

According to a fourth aspect of the present invention, in the first to third aspects, the filter holder has a larger inner diameter from the upstream side to the downstream side, and the filter holder is connected to the upstream side by a step formed in the middle. A test filter is set in a region having a gas flow passage which is constricted to the same small inner diameter and continues downstream with the same inner diameter, and a gas turbulence formed in the step portion does not disappear downstream of the step portion. A first filter set portion is formed, and a second filter set portion for setting a subsequent filter is formed downstream of the first filter set portion.

In a fifth aspect based on the fourth aspect, the corners and the corners of the step are formed smoothly.

In a sixth aspect based on the fourth or fifth aspect, the first filter set and the second filter set are formed so as to be disassembled and assembled.

In a seventh aspect based on the first to sixth aspects, the gas flow is a gas flow comprising nitrogen gas, helium gas, argon gas, air, combustion gas, and other gases.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a system diagram showing an entire embodiment of a filter test apparatus according to the present invention. In the figure, 1 is a nitrogen gas supply device comprising a film pressure nitrogen generator or the like for supplying nitrogen gas as a carrier gas, 2 is a pipe (for example, 12.7 mmφ, SUS316), 3 is a pressure regulator, 4 is a pipe 2 5 is a silver particle generator for generating silver particles to be put on nitrogen gas, 6 is a filter holder for setting a test filter and another filter, and 7 is finally exhausted. This is a double-tube water-cooling type cooler for cooling the nitrogen gas to be cooled.

In this filter test apparatus, nitrogen gas is supplied from the nitrogen gas supply apparatus 1 at a flow rate of about 0.8 Nm ³ / h, and the pressure is adjusted to about 0.1 Kg / cm ² by the pressure adjustment apparatus 3. Is sprayed on the silver particle generator 5. The high-frequency induction heating coil 4 is a coil of a copper pipe through which cooling water is circulated, is wound around the pipe 2, generates eddy current by flowing high-frequency current through the coil 4, and generates a silver particle generator. 5 is heated to about 900 ° C. on the upstream and downstream sides of the nitrogen gas. The silver particle generator 5 is, for example, 900 to 1 by heating means (506) described later.
The above-mentioned nitrogen gas is sprayed on silver Ag heated and melted at about 200 ° C., and the evaporated silver particles are blown off so as to be almost evenly put on the nitrogen gas flow. Here, the amount of the generated ultrafine silver particles increases in proportion to the heating temperature, the amount of nitrogen gas, the blowing speed of the gas flow, and the like. The filter holder 6 is heated 90 by the heating means (606).
It is heated to about 0 ° C. Here, a test filter is set on the upstream side, and a post-stage filter is set and held on the downstream side. After that, those filters are taken out and captured by the pre-stage test filter. The performance (capture rate) of the preceding test filter is measured by comparing the amount of silver particles obtained and the amount of total silver particles captured by all filters (analysis using a weight ratio or a chemical reaction). The pressure loss in the filter holder 6 is about 0.1 Kg / cm ² , and the nitrogen gas passing therethrough is cooled to about 70 ° C. by the cooler 7 and then discharged to the atmosphere.

FIG. 2 is a sectional view showing details of the silver particle generator 5. Reference numeral 501 denotes a crucible block in which silver Ag is placed in a crucible 501a; 502, a block having a hole 502a that is continuous with the crucible 501a; This is a guide block for guiding particles flipped out of the crucible 501a to the downstream pipe 202. Also, 5
04 is a temperature measuring element such as a thermocouple for measuring the temperature of the crucible 501a to control the temperature, 505 is a heat insulating material made of ceramics or the like for keeping the entire silver particle generator 5, and 506 is a cooling water flowing inside. High frequency induction heating coil made of copper. The blocks 501 and 502 are watertightly connected by bolts (not shown) and metal O-rings 507. Here, the blocks 501 to 503 are preferably made of heat-resistant steel.

In the silver particle generator 5, silver Ag sealed in the crucible 501 a is cooled by a high-frequency induction heating coil 506.
It is heated and melted to about 1200 to 1200 ° C (approximately 960 ° C for small quantities), and a nitrogen gas stream heated to about 900 ° C is directly blown from the nozzle 201 at a pressure of about 0.1 Kg / cm ^2. As a result, the evaporated silver particles fly out at a high temperature, flow almost evenly in the nitrogen gas flow, and flow downstream from the pipe 202. The amount of silver particles generated at this time is about 2 × 10 ¹³ atom / s, and the diameter of the particles is
It is about 0.001 to 10 μm. Therefore, for example, when operating continuously for two weeks, about 0.47 cc of silver may be sealed in the crucible 501a with a margin.

FIG. 3 is a sectional view showing details of the filter holder 6. Reference numeral 601 denotes a gas flow inflow side block, the upper end of which is connected to the silver particle generator 5 via the pipe 2 with the high-frequency induction heating coil 4, and whose gas flow passage 601a has an inner diameter of 10 The lower end is 4 to 5 times the inner diameter of the upper part (for example,
41.8 mm). Reference numeral 602 denotes a turbulence forming block, which is a gas flow passage 601 of the inflow side block 601.
a large-diameter gas flow passage 602a that is continuous with the gas flow passage 602a. 602c. The length of the gas flow passage 602c from the step 602b to the lower end is reduced to, for example, about 20 mm.
In the step portion 602b whose inner diameter changes from the gas flow passage 602a to the gas flow passage 602c, a corner or a corner portion or a smooth portion is formed. 603, an upper filter guide block;
4 is a lower filter guide block. In the upper filter guide block 603, a filter set portion 603b having a larger diameter (almost twice) than that of the gas flow passage 603a is formed at the upper end, and the test filter 81 is set there. Is held in. At the upper end of the lower filter guide block 604, a filter set portion 604b having a larger diameter (almost twice) than that of the gas flow passage 604a is formed, and the lower filter 82 is set there, and the upper filter guide block 6 is set.
03 is maintained. These filters 81,
The outer diameter of 82 is, for example, approximately twice as large as the gas flow passages 603a and 604a. The blocks 601 and 602, the blocks 602 and 603, and the blocks 603 and 604 are water-tightly connected by bolts (not shown) and metal O-rings 605, respectively. Similarly to the silver particle generator 5, a high-frequency induction heating coil 606 made of copper through which cooling water flows is wound around the filter holder 6 via a heat insulating material (not shown). (See FIG. 1).

Since the test cross-sectional area of the test filter 81 is the same as the cross-sectional area of the gas flow passages 602c and 603a and is relatively large (about 10 mm in inner diameter), the flow rate of the nitrogen gas is high in the central portion and slow in the peripheral portion. A non-uniform distribution, that is, a laminar flow is likely to occur, and an appropriate filter test cannot be performed. In order to solve this problem, it is conceivable that a turbulence is generated by forming a throttle in the gas flow passage.The turbulence occurs at that portion in the throttle, but the turbulent flow occurs at the downstream portion where the original diameter returns. Returning to the flow, not effective.

Therefore, in the present embodiment, the inner diameter of the gas flow passage is successively increased about 4 to 5 times in the block 601 and the large diameter portion is continuously formed with the same diameter near the lower portion of the block 602. Step 6 at the bottom of
02b was formed to return to the original inner diameter again to solve the problem. Here, the flow velocity of the gas flow temporarily decreases at a portion where the inner diameter of the gas flow passage becomes large, and becomes a stable laminar flow. The flow becomes turbulent at the step portion 602b to increase the speed. Since the gas flows in the passage, a turbulent state, that is, a state in which the flow velocity distribution is substantially uniform, is at least in the gas flow path 602.
c to 603a and further to the gas flow passage 604a for a while.
82. At this time, since the corners and corners of the step portion 602b are smooth, the flow velocity distribution is made more uniform. Therefore, since nitrogen gas having a uniform flow velocity distribution and silver particles substantially uniformly flows into the filters 81 and 82, the effective filter area of the filter 81 can be uniformly tested.

As described above, after the test apparatus has been continuously operated, for example, for two weeks, the test filter 81 and the post-filter 82 are removed, and the weight of the silver particles captured by the test filter 81 is D1, and the post-filter 82 Assuming that the weight of the silver particles captured in step is D2, the capture rate of the test filter 81 can be measured by D1 / (D1 + D2).

[Other Embodiments] In the above description, it is assumed that silver particles not captured by the test filter 81 are completely captured by the subsequent filter 82, but are completely captured by the subsequent filter 82. If it cannot be captured, the number of subsequent filters is increased to increase the number of filter stages to n (≧
3) More than steps, D1 / (D1 + D2 + ... + Dn)
The capture rate of the test filter 81 may be measured by (D2 to Dn are the weights of the silver particles captured by the subsequent filters). Further, the amount of silver particles captured by each filter can be measured by chemical analysis after dissolving with HNO ₃ irrespective of weight.

In the above description, nitrogen gas is used as a carrier gas for carrying silver particles to the filter. However, argon gas, helium gas, air, combustion gas, or any other gas can be used. Further, the filter test apparatus of the present invention is not limited to the test of a filter that captures flying objects (such as iodine, cesium, and carbon other than silver described above) in a high-temperature gas reactor including a nuclear reactor, and the temperature range is not limited to this. Up to about 4000 ℃, pressure up to 20kg
/ cm can be used to test the trapping filter for various projectile in conditions up to about ^2, for example, projectile capturing filter fusion reactor tokamak furnace, projectile capturing filter nuclear facilities, coal high-temperature Filters for capturing flying objects in gasification power generation facilities, filters for capturing flying objects in fires and explosions, filters for capturing mixed flying objects in gas turbines and jet turbines, and capturing flying objects from space to artificial satellites It can be used for testing filters and the like.

[0026]

As described above, according to the first aspect of the present invention, a desired flying object can be transported to the test filter and the succeeding filter while being almost evenly put on the high-temperature gas flow, so that the performance of the test filter can be properly adjusted. Can be tested.

According to the second and third aspects of the present invention, since a high-temperature gas is blown to the molten and evaporated flying material, the flying object can be accurately fly in the form of ultrafine particles, and a more appropriate filter test can be performed. Will be able to do.

According to the fourth to sixth aspects of the present invention, the gas flow flowing to the test filter becomes turbulent and its velocity distribution becomes substantially uniform, so that the performance test of the filter can be performed more appropriately. Become like

According to the seventh aspect, since any gas flow can be used, performance tests of filters for various uses can be performed.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a filter test apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a silver particle generator.

FIG. 3 is a sectional view of a filter holder.

[Explanation of symbols]

1: nitrogen gas supply device, 2: piping, 3: pressure regulator,
4: High frequency induction heating coil, 5: Silver particle generator, 50
1: crucible block, 502: block, 503: guide block, 6: filter holder, 601: inflow side block, 602: turbulence formation block, 603: upper filter guide block, 604: lower filter guide block, 7: cooler .

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Motoo Fumizawa 3607 Niibori-cho, Narita-cho, Oarai-cho, Higashiibaraki-gun, Ibaraki Japan (72) Inventor Saetsu Arai 3-chome Ebisu, Shibuya-ku, Tokyo 43-2 Nikkiso Co., Ltd.

Claims (7)

[Claims] 1. A means for generating a gas flow having a predetermined pressure, and ultra-fine particle generating means provided in the middle of a pipe for transporting the gas flow, the generated ultra-fine particles being substantially evenly loaded on the gas flow,
A filter holder in which a test filter is set at the first stage and a downstream filter is set downstream thereof at the first stage, and a pipe upstream of the ultra-fine particle generating unit and the ultra-fine particle generator and the filter holder are arranged downstream of the ultra-fine particle generating unit. And a first heating means for heating a pipe between them to a predetermined temperature. 2. The method according to claim 2, wherein the means for generating ultrafine particles comprises silver, cesium,
Crucible means for enclosing iodine, carbon, and other flying materials; second heating means for heating the crucible means to melt the flying materials; and the crucible means for flowing the gas stream transported from upstream. 2. The nozzle according to claim 1, further comprising: nozzle means for spraying the flying material in the inside, and guide means for sending out the ultrafine particles of the flying material blown off by the gas flow in the crucible means downstream. Filter testing equipment. 3. The filter test apparatus according to claim 2, wherein said crucible means is configured to be disassembled and assembled. 4. An inner diameter of the filter holder increases from an upstream side to a downstream side, and the large inner diameter is reduced to substantially the same small inner diameter as that of the upstream side by a step formed in the middle, and the downstream diameter remains substantially the same as that of the upstream side. A first filter set portion for setting a test filter in a region downstream of the step portion where the gas turbulence formed in the step portion does not disappear downstream of the step portion; 4. A second filter setting section for setting a post-stage filter downstream of the setting section.
3. The filter test apparatus according to 1. 5. The filter test apparatus according to claim 4, wherein the corners and the corners of the step are formed smoothly. 6. The first filter set section and the second filter set section.
The filter test apparatus according to claim 4, wherein the filter set portions are formed so as to be disassembled and assembled. 7. The method according to claim 1, wherein the gas flow comprises nitrogen gas, helium gas,
The filter test apparatus according to any one of claims 1 to 6, wherein the filter test apparatus is a gas stream composed of argon gas, air, combustion gas, and other gases.