JPH10221223A - Collecting/removing method for atmospheric material and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an unmanned and continuous collection by applying a gas- liquid separation to a mixture adsorbed or dissolved with an atmospheric material into a fine grain-like liquid, and collecting the atmospheric material in a separated liquid. SOLUTION: An atmospheric material such as a chemical material is floated in a gas, and it is guided into a mixing chamber 3 from a collecting tube 2. A fine grain-like liquid is also guided into the mixing chamber 3, and the atmospheric material is adsorbed to the surface of liquid fine grains or dissolved in the liquid fine grains by mixing and stirring. A medium containing the atmospheric material can be converted into the liquid from the gas. The liquid fine grains adsorbing or dissolving the atmospheric material can be collected in the floated state in the gas. The liquid fine grains adsorbing or dissolving the atmospheric material are guided into a gas-liquid separator 4 and separated into the gas and liquid fine grains, and the separated gas is discharged with a suction pump 7. The atmospheric material collected by the gas-liquid separator 4 is fed to an analyzer 6 in the liquid state to be analyzed or discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for atmospheric substances such as environmental measurement, exhaust gas measurement, and air cleaning, and more particularly to a method and apparatus for collecting and removing atmospheric substances.

[0002]

2. Description of the Related Art In a process of treating air substances such as environmental measurement, exhaust gas measurement, air cleaning, etc., chemical substances and aerosols floating in the air are collected and collected, and the collected air substances are analyzed by an analyzer. Or doing removal.

For example, in each treatment process, waste treatment process, environmental monitoring monitor, exhaust gas monitoring monitor, etc. of a chemical industry plant, a specific chemical substance or aerosol is measured to measure the processing process, environmental conditions, and the like. They monitor exhaust gases and remove specific chemicals and aerosols. The chemical substance or aerosol to be monitored may exist in a state of being suspended in a gas such as the atmosphere during each processing step or in the environment. In order to measure such chemicals and aerosols, a sample is taken from the atmosphere and specific chemicals are separated and concentrated from this sample, or unnecessary chemicals other than those to be monitored are removed. Therefore, it is necessary to remove a specific chemical substance from the processing object.

A method of collecting and trapping chemical substances and aerosols floating in the atmosphere has conventionally been described in, for example, JIS K0.
[095] An absorption bottle method, a vacuum flask method, an injection cylinder method, a collecting bag method, and the like as shown in the exhaust gas sampling method are known. In any of these collection methods,
The sample is collected in a gaseous state in various containers decompressed by a suction pump, and a collecting method is selected according to a substance to be analyzed. As for the analysis method and the analysis device, the method and the device corresponding to the characteristics of the collected chemical substance and the aerosol are selected.

[0005]

A method and an apparatus for collecting and removing atmospheric substances which have been used in the past are to collect only air in a collecting container in a gas state at a sampling point. It is common that the transported container is transported to a facility equipped with an analyzer, and the analysis is performed in the facility,
Many operations rely on manual labor, and a time difference occurs between the sampling time and the analysis time.

[0006] Therefore, in the conventional method and apparatus for collecting and removing atmospheric substances, atmospheric substances can be collected continuously, periodically or at a predetermined time by an unattended person.
There is a problem that it is difficult to perform monitoring, and it is also difficult to configure a portable monitoring monitor and an analyzer that include a collection device.

In exhaust gas measurement, in particular, monitoring changes over time in the concentration of atmospheric substances is one of important measurement items, and unmanned monitoring is one of important measurement requirements.

[0008] Accordingly, the present invention provides a conventional method for trapping atmospheric substances,
It is an object of the present invention to provide a method and an apparatus for collecting and removing atmospheric substances which can solve the problems of the removing method and the apparatus and can continuously collect the atmospheric substances unattended. It is an object of the present invention to provide a collection and removal method and apparatus applicable to a monitoring monitor capable of monitoring.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a method for measuring a chemical substance or aerosol floating in the atmosphere in monitoring a chemical plant, a process during waste treatment, an environment, and exhaust gas. A method and apparatus for collecting atmospheric substances from the atmosphere and removing unnecessary substances,
A substance that converts a medium containing air matter from a gas into a liquid that can easily collect and remove air matter by adsorbing or dissolving air matter suspended in the air into a particulate liquid. It is. As described above, by using a liquid as a medium for collecting atmospheric substances, it is easy to continuously perform collection of atmospheric substances unattended, and the present invention is applied to a monitoring monitor capable of unmanned monitoring and continuous monitoring. It becomes easier.

The method for collecting and removing atmospheric substances according to the present invention comprises mixing an introduced air sample with a particulate liquid, adsorbing or dissolving air substances floating in the atmosphere into the particulate liquid, and removing the mixture from the mixture. It performs gas-liquid separation and collects air substances in the separated liquid. The air substance collection and removal apparatus of the present invention mixes the introduced air sample with a particulate liquid, By providing a mixing unit for adsorbing or dissolving airborne substances in the air to particulate liquid, a gas-liquid separation unit for separating gas and liquid from the mixture, and a collection container for collecting the separated liquid Configure.

According to the method and apparatus for collecting and removing atmospheric substances of the present invention, when a liquid in the form of fine particles is mixed with an introduced atmospheric sample, chemical substances floating in the atmosphere or atmospheric substances such as aerosols can be obtained. Is adsorbed on the surface of the liquid fine particles or dissolved in the liquid fine particles. Thereby, the medium in which the atmospheric substance is present can be converted from a gas to a liquid. The gas-liquid separation unit can condense the liquid fine particles containing the air substance to separate the air and the liquid, and collect and remove the air substance in the air sample in a liquid state.

[0012] In the first embodiment of the present invention, the mixing section includes an ultrasonic nebulizer, which agitates the liquid which has been made into fine particles by the ultrasonic nebulizer and the air sample which has been introduced. Adsorbs and dissolves atmospheric substances into the air.

[0013] In a second embodiment of the present invention,
Liquid fine particles are distilled water, acidic water, and alkaline water. The use of distilled water enables the collection and removal of water-soluble atmospheric substances, and the use of acidic water allows the collection of alkaline water-soluble atmospheric substances. Collection and removal, and
The use of alkaline water to collect and remove acidic water-soluble airborne substances. It dissolves acidic chemicals in alkaline liquid fine particles well. Good dissolution in fine particles.

[0014] In the third embodiment of the present invention, the liquid fine particles are an organic solvent, and by using the organic solvent, it is possible to collect and remove organic atmospheric substances.
By selecting the type of the organic solvent, it is possible to selectively collect and remove atmospheric substances.

According to a fourth embodiment of the present invention, in a collection container or the like, an alkaline reaction solution is mixed with liquid fine particles in which an acidic chemical substance is dissolved, and a liquid is mixed with a liquid fine particle in which an alkaline chemical substance is dissolved. An acidic reaction liquid is mixed, and a neutralized mixed liquid is generated by a neutralization reaction of the two, whereby gas and liquid are separated, and an acidic chemical substance or an alkaline chemical substance is selectively separated. .

In a fifth embodiment of the present invention, the gas-liquid separation section includes a cooling separator, and the liquid fine particles are condensed by passing the liquid fine particles through the cooling separator.
The mixture can be separated into a gas and a liquid.

In the sixth embodiment of the present invention, in the analysis of atmospheric substances, the liquid separated and collected in the gas-liquid separation section or the liquid from which unnecessary substances have been removed is sent to the analyzer.

Further, in a seventh embodiment of the present invention,
In the analysis of atmospheric substances, liquid fine particles obtained by mixing in a mixing section are sent to an analyzer.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are a schematic configuration block diagram and an operation state diagram for explaining the collection and removal of atmospheric substances according to the present invention. In FIG. 1, an apparatus for collecting and removing atmospheric substances according to the present invention is intended to measure airborne substances such as chemical substances floating in the atmosphere or aerosols. A sampling pipe 2 for introducing the air to be measured in various environments, such as an environment or an exhaust gas environment, and mixing and stirring the collected air and liquid fine particles to convert atmospheric substances and aerosols floating in the air into liquid. A mixing chamber 3 for adsorbing on the surface of the fine particles or dissolving in the liquid fine particles, and a gas-liquid separator for separating the liquid fine particles adsorbing and dissolving the atmospheric substance in the mixing chamber 3 and the gas for suspending the liquid fine particles. And a collection container 5 for collecting the liquid separated by the gas-liquid separator 4. The atmospheric substance collected in the collection container 5 is analyzed in the analyzer 6. In addition, mixing chamber 3
Further, a suction pump 7 for drawing air containing air or liquid fine particles into the separator 4 is provided.

In FIG. 2, the trapping of atmospheric substances according to the present invention,
The operating state of the removal can be described as follows.
The air sample contains an air substance such as a chemical substance or an aerosol (symbol S in the figure) in a state of being suspended in a gas.
It is introduced into the mixing chamber 3 in a gaseous state from the above (operation state indicated by S1 in FIG. 2). Further, a particulate liquid (reference numeral L in FIG. 2) is also introduced into the mixing chamber 3, and the air substance S and the liquid particulate L are mixed and stirred in the mixing chamber 3 (S2 in FIG. 2). Operation state indicated by). By this mixing and stirring operation, the atmospheric substance S is adsorbed on the surface of the liquid fine particles L or the liquid fine particles L
Dissolve in Thereby, the medium in which the atmospheric substance S exists can be converted from a gas to a liquid.

At this time, distilled water, acidic water, or alkaline water can be used as the liquid fine particles. When using distilled water, water-soluble atmospheric substances can be adsorbed and dissolved in liquid fine particles. When using acidic water, alkaline water-soluble atmospheric substances can be adsorbed and dissolved in liquid fine particles. When alkaline water is used, acidic water-soluble atmospheric substances can be adsorbed and dissolved in liquid fine particles. The acidic chemical substance dissolves the alkali liquid fine particles well, and the alkaline chemical substance dissolves well in the acidic liquid fine particles, so that the collection efficiency of the atmospheric substance can be improved.

An organic solvent can be used as the liquid fine particles. When the liquid fine particles of the organic solvent are used, it is possible to collect and remove organic air substances, and to selectively collect and remove air substances by selecting the type of the organic solvent. can do. For example, when collecting hydrogen chloride as an air substance, liquid fine particles are generated by a sodium hydroxide solution, and when collecting ammonia as an air substance, liquid fine particles are generated by an acidic solution containing hydrogen chloride. .

Therefore, in the mixing chamber 3, liquid fine particles adsorbing and dissolving the atmospheric substance S (in FIG. 2,
A symbol L with a symbol S around it, hereinafter denoted by S + L)
It can be collected in a state of being suspended in gas (the operation state indicated by S3 in FIG. 2).

Next, the liquid fine particles S + L having adsorbed and dissolved the atmospheric substance S are led to the gas-liquid separator 4 to separate the gas and the liquid fine particles (operation state indicated by S5 in FIG. 2). By this separation operation, the liquid fine particles are collected and condensed (the operation state indicated by S6 in FIG. 2). The separated gas is released by the suction pump 7.

The collection container 5 collects the liquid fine particles S + L separated by the gas-liquid separator 4 (operation state indicated by S7 in FIG. 2). A liquid for collecting the liquid fine particles S + L can be stored in the gas-liquid separator 4 or the collection container 5 in advance, and the same liquid as the liquid fine particles L used for adsorption and dissolution of the atmospheric substance S can be stored. Can be used. In addition to the above, as a liquid to be stored in the gas-liquid separator 4 or the collection container 5, an alkaline reaction liquid is used for liquid fine particles in which an acidic air substance is dissolved, and an alkaline air substance is dissolved. A reaction solution acidic to the liquid fine particles can be used. When this reaction solution is used, a neutralized mixed solution is generated by a neutralization reaction between the atmospheric substance and the reaction solution.

In general, acidic chemicals dissolve in alkaline solutions, and alkaline chemicals dissolve in acidic solutions. Therefore, in order to dissolve gaseous air substances, an acidic reaction liquid is used for liquid fine particles in which acidic air substances are dissolved, and an alkaline reaction liquid is used for liquid fine particles in which alkaline air substances are dissolved. To cause a neutralization reaction, to separate gas and liquid, and to selectively separate acidic or alkaline atmospheric substances.

The atmospheric substance collected by the gas-liquid separator 4 is sent to the analyzer 6 in a liquid state for analysis (operation state shown by S8 in FIG. 2) or discharge (FIG. 2). (Operation state shown by S9 in the middle). When the concentration of the atmospheric substance is high, the liquid fine particles obtained in the mixing chamber 3 can be introduced as they are into an analyzer such as an ICP or an atomic absorption device to perform analysis.

Next, an example of the configuration of the apparatus for collecting and removing atmospheric substances according to the present invention will be described with reference to FIGS. In the configuration example of the collection and removal device 1 shown in FIG. 3, the mixing chamber 3 can be configured by an ultrasonic nebulizer 31. The ultrasonic nebulizer 31 includes a chamber 32 for mixing the introduced air sample with liquid fine particles,
A liquid is supplied from a liquid container 33 into the chamber 32,
Generate liquid fine particles. The generated liquid fine particles are mixed with the introduced air sample, and a mixed gas 35 is generated.

The gas-liquid separator 4 can be constituted by a cooling separator 41 provided with a cooler 42, and the ultrasonic nebulizer 31 is depressurized by a suction pump or the like.
, A gas mixture 35 is introduced to separate the gas and the liquid.
The liquid is collected in the liquid contained in the cooling separator 41, and the gas is exhausted to the suction pump side. The collection container 5 collects the liquid obtained by the cooling separator 41 and introduces the liquid into the analyzer.

The ultrasonic nebulizer 31, the cooling separator 41, and the analyzer can be controlled by a controller (not shown), and an automatic monitoring monitor can be configured by performing automatic operation. In this monitoring monitor, by programming the measurement procedure,
The collection, removal, and measurement of atmospheric substances can be performed unattended, continuously, periodically, or at a predetermined time.

FIG. 4 shows an example of a configuration in which the mixed gas 35 obtained by the ultrasonic nebulizer 31 is directly introduced into an analyzer such as an ICP or an atomic absorption apparatus without using a cooling separator.

FIG. 5 shows the results of an experiment using the apparatus for collecting and removing atmospheric substances according to the present invention.
1 shows data obtained by analyzing an E.ml by an ion chromatograph.
FIG. 5A shows the analysis result of the standard sample, and FIG.
FIG. 5B shows the analysis result of the blank, and FIG. 5C shows the analysis result of the diesel vehicle exhaust gas.

According to the embodiment of the present invention, a monitor for monitoring an inorganic substance, an organic substance, or an exhaust gas in the atmosphere can be formed. Further, according to the embodiment of the present invention, an unmanned continuous analyzer can be configured.

According to the embodiment of the present invention, a portable monitoring monitor and analyzer can be configured. According to the embodiment of the present invention, maintenance can be facilitated by a simple principle structure. According to the embodiment of the present invention, by selecting the property of the liquid that adsorbs and dissolves the air substance according to the air substance, the air substance can be selectively collected and removed from the atmosphere.

[0035]

As described above, according to the present invention,
It is possible to provide a collection and removal method and a device that can continuously and unmannedly collect atmospheric substances and can be applied to a monitoring monitor capable of unmanned monitoring and continuous monitoring.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram illustrating the collection and removal of atmospheric substances according to the present invention.

FIG. 2 is an operation state diagram for explaining collection and removal of atmospheric substances according to the present invention.

FIG. 3 is a schematic diagram for explaining a configuration example of an apparatus for collecting and removing atmospheric substances according to the present invention.

FIG. 4 is a schematic diagram for explaining a configuration example of an apparatus for collecting and removing atmospheric substances according to the present invention.

FIG. 5 shows the results of an experiment using the apparatus for collecting and removing atmospheric substances according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Collection and removal apparatus, 2 ... Collection pipe, 3 ... Mixing chamber, 4 ... Gas-liquid separator, 5 ... Collection container, 6 ... Analyzer, 7
... suction pump, 10 ... air sample, 31 ... ultrasonic nebulizer, 32 ... chamber, 33 ... liquid container, 41 ... cooling separator, 42 ... cooler.

Claims (2)

[Claims] 1. An introduced air sample is mixed with a particulate liquid, air substances floating in the air are adsorbed or dissolved in the particulate liquid, and the mixture is subjected to gas-liquid separation to separate the liquid. A method of collecting and removing atmospheric substances, comprising collecting and removing atmospheric substances by using a liquid. 2. A mixing section for mixing an introduced air sample with a particulate liquid and adsorbing or dissolving an air substance floating in the atmosphere into the particulate liquid, and a gas for separating gas and liquid from the mixture. A device for collecting and removing atmospheric substances, comprising: a liquid separation section; and a collection container for collecting the separated liquid.