JP2017104797A - Dehumidifying module and gas analyzer mounting the dehumidifying module thereon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehumidifying module capable of maintaining dehumidifying performance normally even when a sample gas temperature is under high temperature of 80 to 120°C, and to provide a gas analyzer mounting the dehumidifying module thereon.SOLUTION: High temperature sample gas of 80 to 120°C is made influent without being cooled as it is onto a gas inflow port 25 of the dehumidifying module 20. The sample gas is introduced from the gas inflow port 25, is dehumidified while passing through a center of a hollow fiber 11 and, thereafter, is ejected from a gas outflow port 27. In the dehumidifying module, a braided thread 13 made of material having a softening point temperature higher than that of material of the hollow fiber 11 is fitted on an outer circumference of the hollow fiber 11 and, therefore, a shape of the hollow fiber is kept even when the hollow fiber 11 is exposed to a high temperature of 80 to 120°C. That is, the hollow fiber 11 is not swelled or deformed and, therefore, the dehumidifying performance is normally kept. Accordingly, even when a cooler 4 settled hitherto does not exist, the same dehumidifying performance can be provided.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a dehumidifying module mounted on a gas analyzer, and in particular, a dehumidifying module capable of maintaining normal dehumidifying performance even at a high temperature of a sample gas temperature of 80 to 120 ° C. and a gas analysis to which the dehumidifying module is applied. Relates to the device.

  Components such as nitrogen oxides (NOx) and sulfur oxides (SOx) are contained in the combustion gas discharged from exhaust gas generators such as boilers that burn coal and heavy oil and waste incinerators. For this reason, the concentration of the component is always measured by a gas analyzer, and the analysis result by the gas analyzer is used for controlling denitration and desulfurization.

Moreover, the installer of these exhaust gas generators has an obligation to measure the concentration of nitrogen oxides, sulfur oxides, etc. in the exhaust gas at a predetermined measurement cycle. For this reason, in thermal power plants and waste incinerators where large-scale exhaust gas generators with an exhaust gas amount exceeding a predetermined standard are installed, continuous flue exhaust gas monitoring devices are installed to constantly monitor the flue exhaust gas concentration. ing.
As an example of the gas analyzer for analyzing the exhaust gas flowing through the flue in this way, there is Patent Document 1, for example.

  The gas analyzer has a sampling line for collecting and sampling a part of the exhaust gas flowing through the flue. The target component in the exhaust gas collected by this gas sampling line is quantitatively measured by a gas analyzer.

FIG. 4 shows an outline of the configuration of a conventional sampling line.
A gas sampling device 1, a gas conditioner 2, and a gas suction device 3 are connected to the sampling line, and exhaust gas sucked from the flue by the gas suction device 3 is taken in via the gas sampling device 1. Yes.

JP2002-214216

  By the way, after the exhaust gas that has passed through the gas collector 1, the gas conditioner 2, and the gas suction device 3 is cooled by the cooler 4, it passes through the dehumidifying module 5, the flow checker 6, and the filter 7 for dehumidifying the moisture in the sample gas. Quantitative measurement is performed by the gas analyzer 8.

  Here, the dehumidification module 5 is arranged in the front stage of the gas analyzer 8 when water vapor is included in the gas when measuring each component such as nitrogen oxide (NOx) and sulfur oxide (SOx). This causes a measurement error and leads to a failure of the measurement sensor.

  The dehumidifying module 5 composed of a hollow fiber of fluororesin material is non-porous and can transmit only water vapor, and does not transmit required nitrogen oxide (NOx), sulfur oxide (SOx), etc. Therefore, it is an effective means for the gas analyzer. The hollow fiber has a tubular shape, and when gas analysis functions effectively, there is a slight gap between adjacent hollow fibers that allows water vapor to pass through.

  However, the hollow fiber of the fluororesin material has a softening point temperature as low as 120 ° C. Here, when the temperature is higher than the softening point temperature, the hollow fiber of the fluororesin material does not reach the melting of the material, but the shape cannot be maintained due to the gas pressure applied to the hollow fiber by rapidly expanding its volume, It is easy to deform.

  If the exhaust gas is passed as it is without lowering the temperature of the exhaust gas at the front stage of the dehumidifying module 5, the hollow fiber is exposed to a high-temperature gas of 80 to 120 ° C. As a result, there was a slight gap between the original hollow fibers, but the hollow fibers stuck to each other due to the volume expansion and deformation of the hollow fibers due to high temperatures, and there was a gap through which water vapor could pass. There was a risk that the dehumidifying function could not be achieved.

  For this reason, conventionally, it has been necessary to cool the temperature of the exhaust gas to 60 ° C. before the dehumidifying module 5.

  The present invention has been made in view of such conventional problems, and a dehumidification module that can maintain normal dehumidification performance even at a high temperature of a sample gas temperature of 80 to 120 ° C. and the dehumidification module are applied. To provide a gas analyzer installed in a gas sampling line that measures components such as nitrogen oxide (NOx) and sulfur oxide (SOx) contained in flue exhaust gas from various boilers, waste incinerators, etc. Objective.

  For this reason, the present invention (Claim 1) is a dehumidification module for removing water vapor from exhaust gas in order to analyze components contained in flue exhaust gas, and braided yarn knitted in a braided shape is disposed on the outer periphery. A plurality of tube-shaped hollow fibers that are mounted and through which the exhaust gas flows and pass are provided, and the braided yarn is made of a material having a softening point temperature higher than that of the material of the hollow fibers.

In the dehumidifying module, exhaust gas passes through the inside of the hollow fiber. A braided yarn made of a material having a softening point temperature higher than that of the hollow fiber is knitted around the outer periphery of the hollow fiber. For this reason, even if a hollow fiber is exposed to high temperature exhaust gas, the shape is maintained. That is, since the hollow fiber does not expand or deform, its dehumidifying performance is maintained normally.
Therefore, it is possible to obtain the same dehumidifying performance even if the exhaust gas is not cooled.

  The present invention (Claim 2) is an invention of a dehumidifying module, wherein the braided yarn is a fiber made of resin or metal, and the softening point temperature of the material is 130 ° C. or higher. To do.

  By setting the softening point temperature of the braided yarn material to 130 ° C. or higher, the hollow fiber can be reliably prevented from expanding and deforming. Therefore, the dehumidifying performance is reliably maintained normally.

  Furthermore, the present invention (invention 3) is an invention of a dehumidifying module, wherein the resin is selected from the group consisting of polyester, polyamide, acrylic resin, polyimide, polyamide, polypropylene, rayon, acetate, vinylon, polyvinyl chloride, and polyurethane. It is characterized by being one or more selected.

  Furthermore, the present invention (invention 4) is an invention of a dehumidifying module, wherein the temperature of the exhaust gas flowing into the hollow fiber is 80 to 120 ° C.

  Even if the exhaust gas flows into the dehumidifying module as it is at 80 to 120 ° C. without being cooled, the dehumidifying performance which is not changed can be obtained.

  Furthermore, the present invention (Claim 5) is an invention of a gas analyzer, characterized in that the dehumidifying module according to any one of Claims 1 to 4 is mounted on the sampling line of the exhaust gas.

  Furthermore, the present invention (Claim 6) is an invention of a gas analyzer, characterized in that the exhaust gas of the flue is exhaust gas of a boiler or a waste incinerator.

  Further, the present invention (invention 7) is an invention of a gas analyzer, characterized in that the exhaust gas contains at least one component of nitrogen oxide and sulfur oxide.

  As described above, according to the present invention, the hollow fiber has a braided yarn knitted in a braided shape made of a material having a softening point temperature higher than that of the hollow fiber material. Even when exposed to high temperature exhaust gas, its shape is maintained. That is, since the hollow fiber does not expand or deform, its dehumidifying performance is maintained normally. Therefore, it is possible to obtain the same dehumidifying performance even if the exhaust gas is not cooled.

External configuration diagram of hollow fiber with braided yarn attached to the outer periphery Simplified configuration diagram of dehumidification module (Example) Simplified configuration diagram of dehumidification module (comparative example) The figure which showed the outline of the composition of the conventional sampling line

Hereinafter, embodiments of the present invention will be described. The block diagram of embodiment of this invention is shown in FIG.1 and FIG.2.
FIG. 1 shows the appearance of the hollow fiber. The hollow fiber 11 is formed in a tube shape so that the sampled exhaust gas passes through the center. A braided yarn 13 knitted in a braided shape is attached to the outer periphery of the hollow fiber 11.

Both ends of the braided yarn 13 and the hollow fiber 11 are cut leaving a necessary length. The ends of the braided yarn 13 are heat welded so as not to fray. This heat welding is performed by heating the braided yarn 13 while surrounding the end portion with a heater (not shown).
The hollow fiber 11 is formed of a non-porous membrane. The material of the hollow fiber 11 is preferably a fluorine resin, and particularly preferably a fluorine ion exchange resin.

  As the fluorine-based ion exchange resin, a copolymer having a repeating unit based on tetrafluoroethylene (hereinafter referred to as TFE) and a repeating unit having an ion exchange group is preferable, and in particular, a repeating unit based on TFE and a sulfone. A copolymer having a repeating unit based on perfluorovinyl ether having an acid group is preferred.

  The braided yarn 13 is made of resin or metal fiber. The braided yarn 13 is preferably made of a material having a softening point temperature higher than that of the hollow fiber 11, and particularly preferably has a softening point temperature of 130 ° C. or higher. The softening point temperature of the material of the braided yarn 13 is more preferably 140 ° C or higher, further preferably 150 ° C or higher, and particularly preferably 160 ° C or higher. The material of the braided yarn 13 is a resin having a softening point temperature of 130 ° C. or higher, for example, polyester, polyamide, acrylic resin, polyimide, polyamide, polypropylene, rayon, acetate, vinylon, polyvinyl chloride, and polyurethane. One or more selected from the group consisting of:

  FIG. 2 shows a simplified configuration diagram of the dehumidifying module 20. In FIG. 2, a hollow fiber 11 on which a braided yarn 13 shown in FIG. 1 is mounted is disposed in a cylindrical casing 21. Both ends of the hollow fiber 11 to which the braided yarn 13 is attached are fixed with a heat-resistant epoxy resin 23 or the like. The inner diameter of the casing 21 is, for example, 30 to 50 mm in diameter and 700 to 1300 mm in length. Inside the casing 21, 20 to 100 hollow fibers 11 with braided yarns 13 are arranged. Therefore, the gap between the hollow fibers 11 is visible with the naked eye.

  In order to efficiently transmit water vapor contained in the gas from the hollow fiber, the dried air is flowed in the direction opposite to the gas flow from the purge gas inlet 28 and the air containing the water vapor is discharged from the purge gas outlet 29. To do. This purge method includes two types, a self-purge method in which a part from the gas outlet 29 is returned to the purge gas inlet 28 and an external purge method in which the gas is separately introduced into the purge gas inlet 28 from an external system.

  In such a configuration, a high-temperature sample gas of 80 to 120 ° C. flows directly into the gas inlet 25 of the dehumidifying module 20 without being cooled. If the braided yarn 13 is not attached as in the conventional case, when the hollow fiber 11 exceeds 120 ° C., which is the softening point temperature of the hollow fiber 11, the shape that has been maintained until then is not melted. It cannot be maintained and is in a state of sudden deformation.

  In this case, in particular, when the sampling gas passes through the inside of the hollow fiber 11 and a certain gas pressure is applied, when the softening point temperature of 120 ° C. is exceeded, the hollow fiber 11 has a high gas pressure and a high pressure. It expands and deforms rapidly depending on the temperature, and the degree of deformation can be easily confirmed with the naked eye.

  The sample gas is introduced from the gas inlet 25, dehumidified while passing through the center of the hollow fiber 11, and then discharged from the gas outlet 27. Here, in this embodiment, since the braided yarn 13 made of a material having a softening point temperature higher than that of the hollow fiber 11 is attached to the outer periphery of the hollow fiber 11, the hollow fiber 11 has a high temperature of 80 to 120 ° C. The shape is maintained even when exposed to. That is, since the hollow fiber 11 is not expanded or deformed, a gap for dissipating water vapor is secured between the hollow fibers 11 and the dehumidifying performance is maintained normally.

  Therefore, it is possible to obtain the same dehumidifying performance even if the conventional cooler 4 is not present. Or even if it is a plant which has already installed cooler 4, since it is not necessary to operate the cooler 4, it leads to reduction of operation cost.

Example 1
As an example, the hollow fiber 11 of the dehumidifying module 20 is made of a fluororesin. The braided yarn 13 was formed of polyester having a softening point temperature of 150 ° C. or higher. The inner diameter of the casing 21 is 30 mm in diameter and 700 mm in length. Inside the casing 21, 35 hollow fibers 11 on which the braided yarn 13 is mounted are arranged at almost equal intervals. A sample gas having a gas temperature of 120 ° C. and a dew point of 13 ° C. was introduced from the gas inlet 25 of the dehumidifying module 20. Dry air having a dew point of −10 ° C. was introduced from the purge gas inlet 28 by an external purge method. As a result, a sample gas having a dew point of −10 ° C. was obtained from the gas outlet 27.

(Comparative Example 1)
On the other hand, as a comparative example, 35 hollow fibers 31 of fluororesin material were arranged in the casing 21 of the dehumidifying module 30 shown in FIG. This comparative example has the same configuration as the embodiment of FIG. 2 except that the braided yarn 13 is not attached to the hollow yarn 31. A sample gas having a gas temperature of 120 ° C. and a dew point of 13 ° C. was introduced from the gas inlet 25 of the dehumidifying module 30. Dry air having a dew point of −10 ° C. was introduced from the purge gas inlet 28 by an external purge method.

At this time, the hollow fiber 31 could not maintain its shape and expanded and deformed so that it could be clearly confirmed with the naked eye. That is, the adjacent hollow fibers 31 stick to each other and no gap is visible between the hollow fibers 31. As a result, the dew point at the gas outlet 27 remained at 13 ° C. at the gas inlet 25.
Thus, in the state where the braided yarn 13 is not attached to the hollow fiber 31, the shape of the hollow fiber 31 of the dehumidifying module 30 is deformed and the dehumidifying performance does not appear.

DESCRIPTION OF SYMBOLS 11 Hollow yarn 13 Braided yarn 20, 30 Dehumidification module 21 Casing 23 Epoxy resin etc. 25 Gas inlet 27 Gas outlet 28 Purge gas inlet 29 Purge gas outlet

Claims (7)

A dehumidifying module that removes water vapor from the exhaust gas to analyze the components contained in the flue gas,
A braided yarn knitted in a braided shape is attached to the outer periphery, and includes a plurality of tube-shaped hollow fibers through which the exhaust gas flows and passes.
The dehumidifying module, wherein the braided yarn is made of a material having a softening point temperature higher than that of the hollow fiber.   The dehumidifying module according to claim 1, wherein the braided yarn is a fiber made of resin or metal, and the material has a softening point temperature of 130 ° C or higher.   The dehumidifying module according to claim 2, wherein the resin is at least one selected from the group consisting of polyester, polyamide, acrylic resin, polyimide, polyamide, polypropylene, rayon, acetate, vinylon, polyvinyl chloride, and polyurethane.   The dehumidification module according to any one of claims 1 to 3, wherein the temperature of the exhaust gas flowing into the hollow fiber is 80 to 120 ° C.   A gas analyzer comprising the dehumidifying module according to any one of claims 1 to 4 mounted on a sampling line for the exhaust gas.   The gas analyzer according to claim 5, wherein the flue gas is exhaust gas from a boiler or a waste incinerator.   The gas analyzer according to claim 5 or 6, wherein the exhaust gas contains at least one component of nitrogen oxides and sulfur oxides.

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