KR100781291B1 - Automatic volatile organic compounds(voc) sensing and disposal system and method thereof - Google Patents

Abstract

An automatic organic solvent sensing and treating system and a method for sensing and treating an organic solvent are provided to measure the concentration of an organic solvent gas contained in an air and to remove it automatically by using an activated carbon catalyst, thereby saving electric power. An automatic organic solvent sensing and treating system comprises an organic solvent sensing part(100) which senses the organic solvent contained in air to generate a detection signal; a signal treatment and control part(200) which converts the detection signal into a digital signal, analyzes it with a Matlab program to determine the concentration of gas and compares it with a preset concentration to control the operation of an activated carbon catalyst; a display(300) which displays the detected gas concentration according to the detected gas display control signal; an operation signal transfer part(400) which converts the activated carbon catalyst operation data generated at the signal treatment and control part into an analog operation signal; and an activated carbon catalyst system(500) which operates an activated carbon signal to remove the organic solvent gas contained in air according to the analog operation signal.

Description

Automatic Volatile Organic Compounds (VOC) Sensing and Disposal System and Method etc.

1 is a block diagram showing the configuration of an automatic organic solvent detection and processing system according to the present invention.

2 is a configuration diagram of the organic solvent detection unit of FIG. 1.

3 is a block diagram illustrating an embodiment of the signal processing and control unit of FIG. 1;

4 is an exemplary view of a screen after executing a matlab instruction in the present invention.

Figure 5 is a graph of voltage measurement for each organic solvent concentration in the present invention.

Figure 6 is a graph of voltage measurement by organic solvent concentration after activation of the activated carbon catalyst system in the present invention.

7 is a graph measuring the ppm shown on the PC monitor by injecting an organic solvent in ppm units for the experiment in the present invention.

8 is a graph showing a change state of the organic solvent concentration in the laboratory after operating the activated carbon catalyst system during the experiment in the present invention.

9 is a diagram showing the chemical formula and structural formula of the organic solvent used in the experiment in the present invention.

10 is a chart showing that the use of Acetone as an organic solvent in the laboratory, the concentration of the organic solvent was increased.

11 is a graph measuring the ppm shown on the PC monitor when using Acetone as an organic solvent.

12 is a diagram showing that Toluene was used as an organic solvent in the laboratory, and the concentration of the organic solvent was increased.

Figure 13 is a graph measuring the ppm shown on the PC monitor when Toluene is used as the organic solvent.

14 is a graph showing the change in concentration of the organic solvent before and after the activation of the activated carbon catalyst system when Acetone is used as the organic solvent.

FIG. 15 is a graph showing changes in organic solvent concentration before and after operation of an activated carbon catalyst system when Toluene is used as an organic solvent.

16 is a flow chart showing a method for automatic organic solvent detection and processing according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100 ..... Organic Solvent Detector

200 ..... Signal Processing and Control

300 ..... Display

400 ..... drive signal transmitter

500 ..... Activated Carbon Catalyst System

600 ..... Density setting part

The present invention relates to an automatic organic solvent (VOC: Volatile Organic Compounds) detection and processing system and method thereof, and more particularly, to real-time organic solvent gas in a room using a semiconductor gas sensor, and to organic The present invention relates to an automatic organic solvent detection and treatment system and method for automatically removing organic solvent gas in a room by operating an activated carbon catalyst system after analyzing a concentration of a solvent.

VOC is an abbreviation of Volatile Organic Compounds and is a major air pollutant generated during industrial activities. Especially, it is a major cause of air pollution along with SOx and NOx in combustion exhaust gas. It has been identified as the main substance that causes ground level ozone and also causes the greenhouse effect, and the installation of emission control facilities has emerged as an important task.

The effects of organic compounds (VOCs) on the human body include, but are not limited to, activity of the central nervous system, significant increase in carcinogenic rate upon prolonged high exposure, deterioration of the central nervous system upon toluene inhalation, and damage to the kidneys and liver. Table 1 shows the harmful substances and their symptoms.

Hazardous Substances and Symptoms Hazardous Substances Urgently Symptom Ethyl Benzene Irritant, tearing, inhalation, ingestion, harmful in contact with skin, narcotic at high concentrations Inflammation of skin, redness, irritation of nose / neck / eyes, tearing, conjunctivitis, corneal destruction, dermatitis, drowsiness, anesthesia, chest compressions Toluene Toxic, irritant, inhalation, ingestion, toxic on skin absorption and toxic gas release on pyrolysis Eye irritation, eye enlargement, fatigue, blindness, hyperemia, dizziness, headache, nausea, confusion, blood disorders, dermatitis, lethargy, hallucinations, perception, high levels of fainting, central nervous disorders, bone marrow abnormalities, anemia, whiteness Hypertension, decreased appetite, decreased reaction time, hyperemia in all organs, necrosis of heart / hepate

The controlled substances are shown in [Table 2] below.

Regulated Substance Product and substance name One Acetaldehyde 14 1,2-Dichloroethane 27 Propylene oxide 2 Acetylene 15 Diethylamine 28 1,1-Trichloroethane 3 Aectylene dichloride 16 Dimethylamine 29 Trichloroethylene 4 Acrolein 17 Ethyl Alcohol 30 gasoline 5 Acrylonitrile 18 Ethylene 31 Naphtha 6 Benzene 19 Formaldehyde 32 crude oil 7 1,3-Butadiene 20 n-Hexane 8 Butane 21 Isopropyl alcohole 9 1-Butene 22 Methanol 10 2-Butene 23 Methyl Ethyl Ketone 11 Carbon ectrachloride 24 Methylene chloride 12 Chlororoform 25 Methyl tertiary bytyl Ether 13 Cyclohexane 26 Propylene

The regulatory facilities are shown in Table 3 below.

Regulated facility Regulated facility and place PM10 (㎍ / ㎥) C02 (ppm) HCHO (㎍ / ㎥) CO (ppm) Waiting room at passenger car terminal Waiting room at railway station Waiting room at airport terminal facility Waiting room library Museum and art gallery Funeral home and Jjimjilbang 150 or less Less than 1000 120 or less below 10 Medical Institutions, National Public Child Care Facilities, National Public Nursing Facilities for the Elderly, Specialized Nursing Facilities for the Elderly, Senior Hospitals, Postpartum Care Centers 100 or less Indoor parking lot Less than 200

VOC removal technology is largely classified into physical treatment technology such as adsorption method, chemical treatment technology such as incineration method, and biological treatment technology such as biofilter, and it is selectively used depending on the site conditions such as characteristics and amount of VOC generated in the workplace. .

The technology for removing volatile organic substances is registered in Korean Patent Publication No. 10-0350395 (name of the invention: volatile organic substance adsorbent and filter using the same) (hereinafter, abbreviated as "prior art 1") and registered patent publication number 10-0469005 (name of the invention: a photocatalytic reactor for removing volatile organic compounds) (hereinafter abbreviated as "prior art 2").

The prior art 1 is configured to install an organic material adsorption filter in the organic solvent flow pipe, and to adsorb and remove volatile organic compounds discharged from the storage tank in which all hydrocarbon compounds as well as organic solvents and oils are stored. It can be used and applied to the pretreatment device of VOC removal device such as activated carbon adsorption, biofilter, the adsorption removal pretreatment device of VOC discharged from coating facility.

Prior art 2 is configured such that the controller measures the gas concentration in the air to remove organic compounds with the photocatalytic material through the UV lamp.

However, these prior arts cannot be controlled in real time with a computer, can not automatically maintain the concentration of harmful gases in the air (ppm) to the desired concentration value, and because it uses a separate mechanism to remove volatile organic substances There are drawbacks such as time-consuming and costly device fabrication.

In addition, there was a inconvenience in that the user manually operates the device.

Accordingly, the present invention is proposed to solve the problems of the prior art as described above, and to provide an optimal organic solvent detection and processing system,

An object of the present invention, by using a semiconductor gas sensor to detect the organic solvent gas in the room in real time, and after analyzing the concentration of the organic solvent through the Matlab program to operate the activated carbon catalyst system to operate the organic solvent gas in the room The present invention provides an automatic organic solvent detection and processing system and method for automatic removal.

The present invention for achieving the above object, by using a gas lab to detect the organic solvent in the air generated in the laboratory or factory with a gas semiconductor sensor, and to automatically remove the air purification process using Matlab (Matlab) In this way, it saves power compared to the conventional air purifiers that need to be operated manually, and contributes to the prevention of environmental pollution because it removes organic solvents using activated carbon. In addition, the present invention provides an automatic organic solvent detection and processing system and method, which can be used in unspecified multiple buildings (hospitals, apartments, school laboratories, industrial complexes) as it can be controlled and monitored in real time by a computer.

To this end, the concentration of organic solvent gas present in the room is detected by a continuous analog signal using a semiconductor gas sensor. The detection signal is converted into a digital signal through an input / output board (I / O Board) and transmitted to a computer (PC). The computer uses the Mathlab program to graph the concentration of the organic solvent that changes over time, and activates the activated carbon catalyst system to remove the organic solvent when the concentration is higher than the predetermined concentration. Stop.

The system features real-time measurement and monitoring (monitoring) of the concentration (ppm) of gaseous organic solvents in the air, and CO ₂ , NH ₃ , SO ₄ as well as organic solvents. Various other gaseous substances, such as

Hereinafter, described in detail with reference to the accompanying drawings a preferred embodiment of the present invention. If it is determined that the detailed description of the known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram showing the configuration of an automatic organic solvent detection and processing system according to the present invention.

Here, reference numeral 100 denotes an organic solvent detector that detects an organic solvent in the air and generates a detection signal. Reference numeral 200 denotes a digital signal that processes the signal detected by the organic solvent detector 100 and converts the digital signal. Analyze the gas concentration by analyzing the lablab program, and if the gas concentration detected by comparing the gas concentration and the concentration set by the user through the concentration setting unit 600 is more than the concentration set by the user for driving the activated carbon catalyst Represents a signal processing and control unit to generate a. Here, the signal processing and control unit 200 means a normal personal computer (PC).

In addition, reference numeral 300 denotes a display for graphically displaying the gas concentration detected in response to the detection gas display control signal generated by the signal processing and control unit 200, and reference numeral 400 denotes activated carbon generated by the signal processing and control unit 200. A drive signal transfer unit for converting the catalyst drive data into an analog drive signal is shown.

In addition, reference numeral 500 denotes an activated carbon catalyst system that operates an activated carbon catalyst in response to a driving signal provided by the driving signal transmission unit 400 to remove organic solvent gas in the air.

The operation of the automatic organic solvent detection and processing system according to the present invention configured as described above will be described in more detail.

First, in order to maintain the concentration of the organic solvent in a specific space below a predetermined concentration, the user sets the organic solvent concentration through the concentration setting unit 600. When the organic solvent concentration is set in this way, the signal processing and control unit 200 Storage in the internal memory and organic solvent detection and processing operations begin.

The organic solvent detection unit 100 installed in a specific place detects the organic solvent in the air, generates an analog signal corresponding to the organic solvent detection concentration, and transmits the analog signal to the signal processing and control unit 200. The organic solvent detector 100 is a semiconductor gas sensor that detects a normal gas concentration, and includes a sensor and a heater as shown in FIG. 2. The concentration of the organic solvent in the gas when the gas contacts the ceramic semiconductor surface is used to detect the concentration of the organic solvent in the air.

That is, there is a lot of electrons that can move freely when thermal energy is given in the SnO 2 particles on the semiconductor surface. When oxygen gas (O2) is adsorbed here, these free electrons are trapped in the oxygen gas on the particle surface. Therefore, a potential barrier (oxide film) is formed at the SnO2 particle interface, resulting in low electrical conductivity between the particles. The reducing gas or organic solvent is oxidized with oxygen gas, and when these gases are present, the oxygen gas adsorbed on the surface of SnO2 is removed, and the free electrons trapped in the oxygen gas enter the SnO2 particles, so that the potential barrier is lowered. The electrical conductivity of the liver becomes large. As a result, the amount of adsorption and desorption of oxygen gas determines the sensitivity of the sensor.

When the signal processing and control unit 200 receives an analog signal corresponding to the concentration of the organic solvent from the organic solvent detection unit 100, the signal conversion module 210 converts the analog signal into a digital signal.

The data analysis module 220 creates a command of the matlab program stored in the matlab program storage module 230 based on the digital organic solvent concentration data obtained from the signal conversion module 210, and drives the matlab program to detect the organic solvent concentration data. Will be analyzed.

Here, the Mathlab program command can set Set Point PPM, and includes commands for almost all settings such as real time time setting, DATE, START TIME, Current Time, React Time, and so on.

When the matlab swarm language is executed, a screen as shown in FIG. 4 is displayed on the display 300 through the display module 250.

Where the x-axis represents real time and the y-axis represents concentration (PPM). This PPM is the value obtained by formulating the result of the experiment. In more detail, the signal sensed and sent by the semiconductor gas sensor is an analog voltage value, and in the present invention, the analog voltage value was measured for each organic solvent concentration as shown in FIG. Formula) was established. Taking the inverse of this equation yields the PPM value according to the voltage value, and enters this equation into the Mathlab command. As a result, the voltage value from the semiconductor gas sensor is immediately displayed as the PPM value.

Referring to FIG. 4 again, the instruction execution diagram, it can be seen that the green line goes up. This is because the semiconductor gas sensor senses when the organic solvent is added and goes up.

Thereafter, the determination module 240 compares the detected organic solvent concentration level with the concentration level SET POINT set by the user (eg, set as 1.3 and means a red line in FIG. 4) and the detected organic solvent concentration level. When the organic solvent level is greater than or equal to the concentration level, the catalyst driving module 260 generates a catalyst driving signal for driving the activated carbon catalyst to the driving signal transmission unit 400.

When the activated carbon driving signal is transmitted, the activated carbon catalyst system 500 operates a fan to suck air in a specific space, and the activated carbon filter adsorbs the organic solvent in the sucked air, resulting in purified air. Is discharged back into the specific space.

In this case, the activated carbon catalyst system 500 includes three activated carbon filters in a vat, and fans are installed on both sides so that the fan turns from one side to the other. It passes through two activated carbon filters sequentially and is discharged out again through the other fan (right fan). When the air containing the organic solvent enters the left fan, the organic solvent is adsorbed to the activated carbon in the process of passing through the activated carbon filter, and the purified air goes out to the right fan. Such activated carbon catalyst system has an advantage that it can be implemented in various sizes and shapes because of its excellent applicability.

This operation removes the organic solvent and continuously detects the organic solvent concentration in the air. Here, when the activated carbon catalyst system is operated, the green line (organic solvent detection concentration) drops as shown in FIG. 6, and when the organic solvent concentration falls below the set value, the determination drive 240 turns off the catalyst driving module 260 again to activate the activated carbon catalyst. Causes operation of system 500 to be turned off.

Since this process operates in real time / continuously, the indoor organic solvent concentration set by the user can be maintained.

Experimental Example

In the present invention, a sealed virtual indoor space was created, and an activated carbon catalyst system and a semiconductor gas sensor were installed therein, followed by experiment with an organic solvent. The organic solvent was injected in ppm, and it was measured whether or not the same ppm shown on the PC monitor (see Fig. 7), and it was confirmed whether the activated carbon catalyst system was operated when the concentration was above the set concentration. Thereafter, the concentration of the organic solvent in the room was decreased through a PC screen monitor (see FIG. 8).

As the organic solvent for measurement, Acetone, Toluene, and EA (EthylAcetate), which are most used in chemistry experiments, were used. FIG. 9 shows chemical formulas and structural formulas of the organic solvents used in the experiments.

As a result of the experiment, it can be seen that as the concentration of the organic solvent gas increases, the graph on the PC monitor increases, which is the same as the concentration of the organic solvent gas measured by the semiconductor gas sensor, and the concentration can be actually displayed on the PC monitor. It was confirmed that there is.

FIG. 10 is a chart showing the use of Acetone as an organic solvent in the laboratory, and the concentration of the organic solvent was increased. FIG. 11 is a graph showing ppm measured on a PC monitor when Acetone was used as the organic solvent. Toluene was used as an organic solvent in the laboratory, and the organic solvent concentration was increased. FIG. 13 is a graph showing ppm measured on a PC monitor when Toluene was used as the organic solvent. FIG. 14 is an organic solvent. In the case of using Acetone, the change in the concentration of the organic solvent before and after the activation of the activated carbon catalyst system is shown. FIG. 15 is the change in the concentration of the organic solvent before and after the operation of the activated carbon catalyst system when Toluene is used as the organic solvent.

As a result, when the concentration of organic solvent gas in the laboratory is increased, when the concentration value rises above the arbitrarily set organic solvent gas concentration value (3 ppm, 4 ppm), the Matlab program signals the activated carbon catalyst system and reduces the indoor organic solvent concentration. It can be seen that.

16 is a flowchart illustrating an automatic organic solvent detection and processing method according to the present invention.

As shown, the organic solvent detection unit 100 detects the organic solvent concentration as an analog voltage value in step S101, and converts the detected analog voltage value into digital data corresponding thereto in step S103.

In step S105, a Matlab program command is generated based on the converted digital data, and in step S107, the organic solvent concentration data is analyzed by applying the Matlab command to the Matlab program.

Compare the organic solvent concentration detected in step S109 with a preset value (concentration reference value) set by the user, and move to step S111 only when the detected organic solvent concentration is larger than the set value to drive the activated carbon catalyst system to generate organic The solvent will be removed.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

According to the present invention described above, by measuring the organic solvent gas concentration in the room and automatically controlled it can save power compared to the general air purifier that must be operated manually, and because it is removed organic solvent using activated carbon, it is also great for environmental pollution There is an advantage to making a contribution.

In addition, real-time multi-control and monitoring by computer has the advantage that it is easy to apply to unspecified multiple buildings (hospital, apartment, school laboratory, industrial complex, etc.).

Claims (14)

In organic solvent detection and processing system, An organic solvent detector configured to detect an organic solvent in air and generate a detection signal; The signal detected by the organic solvent detection unit is processed into a digital signal, the digital signal is analyzed by a matlab program to determine a gas concentration, and a signal for controlling the activated carbon catalyst driving by comparing the determined gas concentration with a predetermined concentration. A processing and control unit; A display for graphically displaying a gas concentration detected in response to a detection gas display control signal generated by the signal processing and control unit; A driving signal transmission unit for converting activated carbon catalyst driving data generated by the signal processing and control unit into an analog driving signal; And an activated carbon catalyst system configured to remove the organic solvent gas from the air by operating the activated carbon catalyst in response to the driving signal provided from the driving signal transmission unit. The method of claim 1, wherein the automatic organic solvent detection and processing system, And a concentration setting unit configured to set the concentration of the organic solvent by the user to maintain the concentration of the organic solvent in the specific space below a predetermined concentration. The method of claim 1, wherein the organic solvent detection unit, Automatic organic solvent detection and processing system characterized in that for detecting the concentration of organic solvent in the air by using a change in electrical conductivity that occurs when the gas in contact with the ceramic semiconductor surface. The automatic organic solvent detection and processing system of claim 1 or 3, wherein the organic solvent detection unit is a semiconductor gas sensor that detects an organic solvent concentration. The method of claim 1, wherein the signal processing and control unit, A signal conversion module converting the analog signal corresponding to the concentration of the organic solvent from the organic solvent detection unit into a digital signal; A data analysis module configured to write instructions of the Mathlab program stored in the Mathlab program storage module based on the digital organic solvent concentration data obtained from the signal conversion module, and to analyze the organic solvent concentration detection data by driving the Mathlab program; A determination module that compares the concentration level SET POINT set by the user with the detected organic solvent concentration level, and determines whether the detected organic solvent level is equal to or higher than the set concentration level; And a catalyst driving module configured to provide a catalyst driving signal for driving an activated carbon catalyst to the driving signal transmission unit when a signal is generated from the determination module. The method of claim 5, wherein the signal processing and control unit, And a display module for controlling to display the detected organic solvent concentration level on the screen in association with the data analysis module. The method according to claim 5, wherein the matlab program command, the automatic organic solvent detection and processing, characterized in that it comprises a command to set the Set Point PPM setting, real-time time setting, DATE, START TIME, Current Time, React Time, etc. system. The method of claim 5, wherein the data analysis module, Extracting the analog voltage value output from the organic solvent detection unit for each organic solvent concentration to establish a general formula (log expression), and extracting the formula for calculating the PPM value according to the analog voltage value by taking the inverse of the general formula. And converting the analog voltage value output from the organic solvent detection unit into a PPM value by inputting the extracted expression into a matlab instruction. According to claim 1, The activated carbon catalyst system, When the activated carbon driving signal is transmitted through the driving signal transmission unit, the air is sucked in a specific space and the organic carbon in the sucked air is sucked by the activated carbon filter therein to discharge the purified air from which the organic solvent has been removed into the specific space. Automatic organic solvent detection and processing system, characterized in that. The method of claim 9, wherein the activated carbon catalyst system, Three activated carbon filters are provided in the cylinder, and the fans installed on both sides of the cylinder are operated to suck external air into one fan (left fan), and the organic solvent is adsorbed and removed through the three activated carbon filters, followed by the other fan. Automatic organic solvent detection and processing system, characterized in that to discharge the purified air through the (right fan). The method of claim 1, wherein the signal processing and control unit, Continuously detect the concentration of organic solvent in the air, and if the detected organic solvent concentration drops below the set value by the activation of the activated carbon catalyst system, the activated carbon catalyst system is turned off to maintain the indoor organic solvent concentration at the level set by the user. Automatic organic solvent detection and processing system, characterized in that. In the organic solvent detection and treatment method, A first step of detecting the organic solvent concentration as an analog voltage value through the organic solvent detection unit; A second step of converting the analog voltage value detected in the first step into digital data corresponding thereto; A third step of generating a Mathlab program command based on the converted digital data and analyzing the organic solvent concentration data by applying the created Mathlab command to the Mathlab program; Comparing the detected organic solvent concentration with a preset value set by the user (concentration reference value), and when the detected organic solvent concentration is larger than the set value, driving the activated carbon catalyst system to remove the organic solvent in the room; Automatic organic solvent detection and processing method comprising a. The method of claim 12, wherein the Matlab program command, the automatic organic solvent detection and processing, characterized in that including a command to set the Set Point PPM, real-time time setting, DATE, START TIME, Current Time, React Time, etc. Way. The data analysis of claim 12, wherein Extracting the analog voltage value output from the organic solvent detection unit for each organic solvent concentration to establish a general formula (log expression), and extracting the formula for calculating the PPM value according to the analog voltage value by taking the inverse of the general formula. And converting the analog voltage value output from the organic solvent detection unit into a PPM value by inputting the extracted expression into a matlab command.

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