JP2008275383A - Method and device for measuring concentration of mixed component system, and operation control system of energy-saving or exhaust-cleaning facility using device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine simply and accurately the concentration of each component in a mixed component system. <P>SOLUTION: In this method for measuring each concentration of two kinds of components included in a mixture, each apparent concentration in the mixture is measured by each concentration measuring method by using two kinds of concentration measuring methods (concentration meters) 1, 2 having each different sensitivity to the two kinds of components. An operation part 3 calculates each concentration of the two kinds of components by using each apparent concentration value and the sensitivity of each component. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and apparatus for measuring the concentration of a mixed component system containing a volatile organic compound (VOC), and a VOC mixed gas supply system for energy saving equipment using the apparatus.

  When measuring the concentration of each component contained in a mixed component fluid, if there is a sensor that selectively detects each component, it is possible to measure the concentration of each component using as many sensors as there are components. Yes, the concentration of each component can be measured continuously even for a mixed component fluid that is continuously flowing in an industrial facility or the like.

  However, in practice, it is difficult to prepare sensors that are selectively sensitive to only one component for each of all the components constituting the mixed component system. That is, the sensor reacts to a plurality of coexisting components although there is a difference in detection sensitivity, and it is difficult to accurately measure the concentration of the specific component. In particular, in a mixed gas containing two or more types of VOCs, it is difficult to easily and automatically continue the concentration of each component.

  More specifically, each organic compound has a specific detection sensitivity relative to a densitometer such as an infrared densitometer or FID (Hydrogen Flame Ionization Detector). For this reason, when a mixture is measured with a certain densitometer, the total value of the values contributed by each coexisting component reacts with the densitometer, and the reacting components are combined and displayed as an apparent concentration. . Therefore, since the apparent concentration detection value does not know which component has what level, it is impossible to measure the correct concentration.

  The JIS standard stipulates that the VOC concentration regulated by the Air Pollution Control Law is based on the FID method, infrared method, and the like. The purpose of this is not to know the components of VOC gas or to accurately measure the concentration of each component, but to measure the apparent concentration of the VOC mixture with a simple measurement method and to regulate by that value. It is.

  At present, in order to accurately determine the component composition and concentration of a mixture, there is no measure other than a method of measuring each component concentration after separating each component. For example, the gas chromatograph method corresponds to this, and the concentration of each component is measured after separation using the difference in adsorption force of each component with respect to the separation layer (silica gel).

  In this method, since a predetermined amount is sampled from the line where the VOC gas is flowing and batch measurement is performed, measurement of one sample is completed in a series of cycles of gas purge-sampling-separation-concentration measurement of the previous measurement.

  Therefore, since it takes a certain time to measure one sample, it is difficult to continuously monitor the concentration with a simple apparatus.

  On the other hand, ESCO (Energy Service Company) companies, etc., use VOC mixed gas discharged from factories and other facilities as gas energy (GT), micro gas turbine (MGT), gas engine (GE), deodorizing furnace, etc. When supplying (that is, when operating energy-saving equipment), it is necessary to accurately calculate the energy supply amount (heat generation amount) and the associated energy-saving performance (power generation efficiency, steam efficiency, total efficiency, etc.) from the viewpoint of the energy supply business is there. For that purpose, it is important to accurately grasp the heat input of the energy-saving equipment. When using a mixed gas such as VOC discharged from the factory as fuel, if the inlet concentration of the energy-saving equipment that uses it can be continuously measured, the heat input can be calculated and the performance of the system can be continuously monitored. The amount can be calculated correctly.

  Under such circumstances, there is a need for a method and apparatus that can easily and continuously measure the concentration of each component in a mixed component system.

  In the prior art, several apparatuses (methods) for continuously measuring the component concentration in the mixed gas have been disclosed. Both are measuring devices that require more than the number of components to detect the target component individually.

  For example, in the “deodorant deodorizing life evaluation method and apparatus” disclosed in Japanese Patent Application Laid-Open No. 6-50920, a mixed gas containing an odor component is continuously measured using a semiconductor gas sensor having more than the number of gas components. According to this prior art, a sensor corresponding to each odor component is required. The relationship between the odor gas component concentration and the sensor output needs to be analyzed in advance by a multiple regression analysis method.

  In "Unburned Gas Measuring Device for Hydrogen Combustor" in Japanese Patent Laid-Open No. 10-239308, the concentration of hydrogen gas and oxygen gas in the hydrogen combustion gas is determined using a hydrogen sensor and an oxygen sensor, and fuel gas (hydrogen) And control oxygen gas supply.

  In these conventional techniques, when the sensor for measuring each component has sensitivity to other coexisting components, it is difficult to accurately measure the concentration of each component.

  In JP-A-62-200255, in an apparatus for measuring the gas concentration of a gas to be measured in an environment where a coexisting gas exists, in addition to a measurement target gas detector that is affected by the specific coexisting gas, a specific coexistence Using a specific coexisting gas detector that is affected only by the gas and not the measurement target gas and other coexisting gases, the measured gas concentration is used as a correction signal. Is detected.

  This apparatus measures only one kind of gas component to be measured separately from other coexisting gas components, and does not aim to measure the concentration of a plurality of components. In addition, the specific coexistence gas detector is limited only by the specific coexistence gas and not by the measurement target gas and other coexistence gases.

JP-A-6-50920 Japanese Patent Laid-Open No. 10-239308 JP-A 62-200255

  The present invention provides a measuring method and apparatus capable of obtaining the concentration of each component of a mixed component system simply and accurately even if only a densitometer having sensitivity to the coexisting components of the mixture is used. It is to provide.

  The present invention is basically a method for measuring the concentration of two kinds of components contained in a mixture, using two kinds of concentration measurement methods having different sensitivities for the two kinds of components, and measuring each concentration. The apparent concentration of the mixture is measured by the method, and the concentrations of the two components are calculated using the apparent measured mixture concentration and the sensitivity of each component to the two types of concentration measurements.

  According to the above measurement method, the relational expression for obtaining the mixing ratio of the two components to be measured from the actually measured concentration value of the mixture measured using the two types of concentration measurement and the sensitivity of each component, for obtaining the true actual measurement value By establishing a relational expression for obtaining a correction coefficient, the concentration of each component of the mixed component system can be measured easily and accurately.

Embodiments of the present invention will be described below with reference to the drawings.
[Example 1]
First, a method for measuring the component concentration of a mixed component system (invention relating to the measurement principle) using a densitometer having different detection sensitivities for two types of components to be measured will be described.

  There are several types of densitometers (sensors). Generally, the component to be measured shows a specific sensitivity depending on the type of the densitometer (measurement principle). Using the difference in sensitivity, the concentration of each component in the mixed system is measured with a plurality of densitometers.

  Hereinafter, a method and apparatus for measuring two component concentrations of VOC gas using two types of densitometers 1 and 2 (concentration measuring method) will be described with reference to FIGS. 1 and 2. . FIG. 1 is a schematic diagram of an apparatus for performing the measurement method of the present invention, and FIG. 2 is a flowchart of the measurement method.

  The densitometers 1 and 2 are provided in the VOC gas supply (feed) line 6, and their measured concentration values are input to the calculation unit 3 (see step S <b> 101 in FIG. 2). The relative sensitivity information of the gas to be measured is input in advance to the calculation unit 3 via the external input device 4.

  Here, the densitometer 1 is an infrared densitometer using the absorbance of infrared wavelength, and the densitometer 2 is an FID type densitometer. Since the measurement principle of these densitometers is well known, a description thereof will be omitted.

  A method and apparatus for measuring each of the components A and B of the mixed VOC gas system including the component A and the component B will be described by taking the case of using these two types of densitometers as an example. Component A is, for example, toluene shown in a collection of materials related to the VOC emission suppression promotion seminar (issued in 2005 by the Ministry of the Environment's Atmospheric Environment Division), and Component B is any one of ethylene, styrene, xylene, etc. Illustrated.

  Each item is expressed as follows.

True concentration of component A = C _A
True concentration of component B = C _B
True total concentration of VOC gas components = C _O = C _A + C _B
Ratio of component A = x% [x = C _A × 100 / (C _A + C _B )]
Measured value [apparent VOC concentration] of infrared densitometer (densitometer 1) = C _{obs. IR}
Measured value of FID densitometer (Density meter 2) [apparent VOC concentration] = C _obs.FID
When measuring the VOC concentration, a toluene equivalent concentration using toluene as a standard may be used. This represents a value obtained by measuring the VOC gas concentration with a densitometer calibrated with a toluene standard. When the VOC component is toluene alone, the true concentration is displayed.

  However, since other types of substances other than toluene generally have a sensitivity different from that of toluene, in the case of a mixture of toluene and other components or another type of substance alone, the true concentration can be obtained even if the toluene equivalent concentration is used. Not shown.

  Here, a VOC gas containing components A and B is considered. Then, the concentration of component B is also expressed in terms of A conversion concentration with component A as a standard. The sensitivity of each component to the densitometer is 1.0 (reference value) when A alone, and the sensitivity of B is expressed as a relative value β when A is 1.0. This relative value is a value specific to the used densitometer, and is measured in advance when the densitometer is calibrated with A, and is input to the calculation unit 3 via the input device 4.

The measured value C _{obs. IR} when measured by the infrared method can be expressed as follows.

Sensitivity of component A to infrared densitometer = 1
Relative sensitivity of component B to infrared densitometer = β _IR .

C _{obs. IR} = (contribution of component A) + (contribution of component B)
= [C _A × (sensitivity of component A to infrared densitometer)] + [C _B × (sensitivity of component B to infrared densitometer)]
= [C _O × (x / 100) × 1] + [C _O × (1−x / 100) × β _IR ]
... (1)
The actual measurement value C _obs.FID when measured by the FID method can be expressed as follows.

Sensitivity of component A to FID = 1
Relative sensitivity of component B to FID = β _FID
C _obs.FID = (contribution of component A) + (contribution of component B)
= [C _A × (sensitivity of component A to FID)] + [C _B × (sensitivity of component B to FID)]
= [C _O × (x / 100) × 1] + [C _O × (1-x / 100) × β _FID ]
... (2)
(2) Calculation of Mixing Ratio The calculation unit 3 calculates the ratio P of the actual measurement values from the actual measurement values of the infrared type and the FID type, and calculates the mixing ratio x of the component A by the following procedure.

  When the ratio P between the measured values of the infrared and FIB formulas is obtained from the above formulas (1) and (2), the following formula is obtained.

C _{obs. IR} / C _{obs. FID} = P = [100β _IR + (1−β _IR ) x] / [100β _FID + (1−β _FID ) x] (3)
Furthermore, when the ratio x of the component A is obtained from the equation (3),
x = (100β _IR −100β _FID P) / [(1−β _FID ) P + (1−β _IR )] (4)
Thus, the ratio x% of the component A at that time can be calculated from the measured values of the infrared type and the FID type.

In this way, the relationship between the mixing ratio x and the relative ratio P can be calculated. Actually, since the relative ratio P is found from the measured values of the infrared and FID formulas, the ratio x percent of the component A is obtained from the value of P by the formula (4).
(3) Correction of Infrared Density Next, the calculation unit 3 corrects the infrared density from the measured values of the infrared type and the FID type by the following procedure.

When the mixed gas of components A and B is measured by the infrared method, the apparent concentration is displayed in a size reflecting the sensitivity β _{IR of} component B. A coefficient for correcting the apparent infrared density to a true density is calculated.

Apparent infrared density is expressed by equation (1).
C _{obs. IR} = [C _O × (x / 100) × 1] + [C _O × (1−x / 100) × β _IR ]
... (1)
If the ratio of the apparent infrared density C _{obs. IR} to the true density _CO is K, the following formula is obtained from the formula (1).

C _{obs. IR} / C _O = K = [(x / 100) × 1] + [(1−x / 100) × β _IR ]
... (5)
From the ratio x% of the component A obtained previously, the infrared density correction coefficient K is determined using equation (5).
In this way, the relationship between the ratio x% of the component A and the infrared density correction coefficient K can be calculated.
Further, an infrared density corrected by the following equation (a true measured value obtained by correcting an apparent actual measurement value of the infrared densitometer) is obtained (step S103).

C _O = C _{obs. IR} / K
(4) Calculation of Component Concentration Next, the calculation unit 3 obtains the component A concentration and the component B concentration in the mixed gas from the ratio x% of the true infrared concentration Co and the component A (step S103).

True component A concentration C _A = C _o × x / 100
True component B concentration C _B = C _o × (1−x / 100)
In the present embodiment, as described above, the relational expression for obtaining the mixing ratio of the two components to be measured from the actually measured concentration value of the mixture measured using the two types of concentration measurement and the sensitivity of each component, and the true actual measurement value are obtained. By establishing a relational expression for obtaining a correction coefficient for obtaining, the concentration of each component of the mixed component system can be measured easily and accurately.
[Example 2]
In Example 1 described above, when the concentrations of two types of components were determined, apparently measured values measured with two completely different densitometers (infrared type densitometer and FID type densitometer) were used. It is also possible to use a physical one such as the infrared densitometer 1 and determine the component concentration of the two-component mixed system using light of two different wavelengths, for example, infrared rays. In other words, the two types of concentration measurement methods in this case are configured by respective infrared concentration measurement methods that measure the apparent concentration of the mixture using infrared rays having two different wavelengths.

  When the component to be measured has different sensitivities with respect to two wavelengths of infrared rays, the measured values of the respective wavelengths can be handled as if they were measured with two types of densitometers.

  That is, the same measurement and calculation with two types of densitometers in Example 1 can be performed with one densitometer.

For example, as shown in FIG. 3, when the two types of components A and B have different sensitivities for the different wavelengths α1 and α2 of the infrared densitometer 1, the actual measurement when measured by the infrared method of the wavelength α1. The value C _{obs. IR1} can be expressed as:

Sensitivity to infrared densitometer at wavelength α1 of component A = 1
Relative sensitivity with respect to the infrared densitometer at wavelength α1 of component B = β _IR1 .

C _{obs. IR1} = (Contribution of component A) + (Contribution of component B)
= [C _A × (sensitivity of component A to infrared densitometer at wavelength α1)] + [C _B × (sensitivity of component B to infrared densitometer at wavelength α1)]
= [C _O × (x / 100) × 1] + [C _O × (1−x / 100) × β _IR1 ]
... (1 ')
Further, the actual measurement value C _{obs. IR2} when measured by the infrared method of wavelength α2 can be expressed as follows.

Sensitivity to infrared densitometer at wavelength α2 of component A = 1
Relative sensitivity with respect to the infrared densitometer at wavelength α2 of component B = _βIR2 .

C _{obs. IR2} = (Contribution of component A) + (Contribution of component B)
= [C _A × (sensitivity of component A to infrared densitometer at wavelength α2)] + [C _B × (sensitivity of component B to infrared densitometer at wavelength α2)]
= [C _O × (x / 100) × 1] + [C _O × (1−x / 100) × β _IR2 ]
... (2 ')
The calculation unit 3 calculates the ratio P of the actual measurement values from the actual measurement values C _{obs. IR1} and C _{obs. IR2} , and calculates the mixing ratio x of the component A by the following procedure.

  When the ratio P between the actually measured values of the wavelength α1 and the wavelength α2 is obtained from the above equations (1 ′) and (2 ′), the following equation is obtained.

_{C obs. IR1 / C obs.IR2 =} P = [100β IR1 + (1-β IR1) x] / [100β IR2 + (1-β IR2) x] ... (3')
Further, when the ratio x of the component A is obtained from the equation (3 ′),
_{x = (100β IR1 -100β IR2 P} ) / [(1-β IR2) P + (1-β IR1)] ... (4')
Thus, the ratio x% of the component A at that time can be calculated from actually measured values using two different wavelengths of the infrared type.

In this way, the relationship between the mixing ratio x and the relative ratio P can be calculated. Actually, since the relative ratio P is determined from the actually measured values of the wavelengths α1 and α2, the ratio x percent of the component A is obtained from the value of P by the equation (4 ′). Note that the infrared density correction coefficient K and the true density calculation of each component using the above-described equation (5) are performed in the same manner as in the first embodiment.
Example 3
In the above embodiment, an example of the mixed VOC gas system has been described. However, even in the solution system, the concentration of the mixed component can be easily and automatically measured in the same procedure as in the first and second embodiments.

  In that case, as shown in FIG. 1 or FIG. 3, the apparatus is established by replacing the VOC gas supply source with a mixed solution supply source.

  For example, when measuring the concentration of a certain component in a solution, one type of spectrophotometer (concentration meter) 1 is used using the apparatus of FIG. 3, and two components using two different wavelengths of light. The component concentration of the mixed system is calculated. When the component to be measured has different sensitivities to light of two wavelengths, the measured values of the respective wavelengths can be treated as if they were measured by two types of densitometers. In other words, the same measurement and calculation in the VOC exhaust gas system is possible in the solution system.

In this case, it is possible to use either two densitometers or one that can measure two wavelengths with one unit.
Example 4
When measuring two components in a mixed system in which the component composition does not vary, if the component ratio is determined first, the concentration of the two components can be continuously measured using a simple conversion formula by continuously measuring with one type of densitometer. Can be sought and monitored. An embodiment in this case is shown in FIG.

In this case, as shown in FIG. 4, the measured value C _{obs. IR} of one type of densitometer 1 is input to the calculation unit 3, and the relative sensitivities of the sample components A and B with respect to the densitometer are 1 and β _IR and the mixing ratio x, (1-x) of the two components are also known and are input to the calculation unit via the input device 4. Thereby, the density | concentration of each component A and B can be calculated | required by executing Formula (5) mentioned above.

  All of the examples described so far are two-component mixed systems. However, even in a mixed system in which a small amount of another component is contained in two main components, if the influence of the small amount component on the concentration is not large, the main two components are used. Assuming a mixed system of components, approximate values of the mixing ratio and concentration can be obtained.

In general, a sensor has a measurement error. In a mixed system of three or more components that contain a small amount of coexisting components in two types of main components, this method should be applied after considering that there are some errors when the minor components remain at the measurement error level. Even if it is an approximate value, it is significant in practice.
Example 5
Next, an energy saving system to which the above-described concentration measuring method according to the present invention is applied will be described with reference to the embodiment of FIG. In the figure, the same reference numerals as those of the above-described embodiments indicate the same or common elements.

  ESCO (Energy Service Company) companies, etc., use the VOC mixed gas discharged from factories etc. as heat energy reuse to energy saving equipment 50 such as gas turbine (GT), micro gas turbine (MGT), gas engine (GE) When supplying, it is necessary to accurately calculate the energy supply amount (heat generation amount) and the energy saving performance (power generation efficiency, steam efficiency, total efficiency, etc.) associated therewith from the viewpoint of the energy supply business.

In this embodiment, the concentration of each component of the VOC mixed gas is obtained using the infrared densitometer 1 and the FID densitometer 2 as in the embodiment of FIG. 1 or FIG. That is,
(1) The apparent VOC concentration, C _obs.IR and C _obs.FID are measured by infrared and FID measurement methods.
(2) Calculate C _obs.IR / C _obs.FID = P from the measured value.
(3) The ratio x% of the component A from P is obtained.
(4) An infrared density correction coefficient K is obtained from the ratio x%.
(5) The actual density (corrected density) Co is obtained by correcting the measured infrared density value (apparent density) with the correction coefficient K.
(6) Furthermore, the flow rate value of the VOC mixed gas is monitored.

  And the high-order calculating part 10 calculates the emitted-heat amount of VOC mixed gas using following Formula.

VOC gas calorific value = calorific value of component A + calorific value of component B = (VOC gas flow rate x concentration of component A x combustion heat of A) + (VOC gas flow rate x concentration of component B x combustion heat of B)
= [VOC gas flow rate x (Co x x / 100) x Combustion heat of component A] + [VOC gas flow rate x [Co x (1-x / 100) x Combustion heat of component B]
According to this embodiment, when using a mixed gas such as VOC discharged from the factory as fuel, it is possible to continuously measure the inlet concentration of the energy-saving equipment that uses it, and to calculate the heat input and continuously monitor the system performance. Thus, the energy saving amount in the ESCO business can be calculated correctly. Note that the thermometer 7 in FIG. 5 measures the temperature of the VOC gas flowing through the feed pipe 6, and the pressure gauge 9 measures the pressure of the VOC gas. These measured values are the flow rate values of the VOC gas. Is input to the calculation unit 3. The thermometer 7 and the pressure gauge 9 in the system of FIGS. 8 and 9 described later also have the same role.
Example 6
If the mixed component concentration of the solution system described in Example 3 can be measured, it can also be used for controlling wastewater treatment facilities such as recovery of valuable components. The schematic system of the Example applied to the valuable component collection | recovery system is shown in FIG.

  6, the factory drain line 6A is provided with the concentration meters 1 and 2 (or only the concentration meter 1) as described in the third embodiment (FIG. 1 or FIG. 3). Further, on the downstream side of the concentration meter of the drainage line 6 </ b> A, a wastewater treatment system 61 is provided for draining the wastewater after guiding it to the valuable component recovery device 60, or draining it without guiding it to the valuable component recovery device 60. ing.

  The calculation unit 3 of the concentration measuring apparatus calculates the concentration value of each component from the actually measured values obtained by the two types of measurement methods that are input, and when at least one of them is equal to or higher than a predetermined concentration, the valve 12 is opened and the valve 11 is closed. Then, the wastewater is guided to the valuable component recovery device 60. If none of the concentration values of the components satisfies the predetermined concentration, the valve 12 is closed and the valve 11 is opened to control the switching of the drainage route for draining the wastewater without passing through the valuable component recovery device 60. .

Many wastewaters from production processes contain valuable components and are collected. When valuable components do not always occur, processing the entire amount of wastewater increases the cost, so it is efficient to switch the drainage route and process it with a recovery device only when a certain concentration or more of the components to be recovered is detected. Operation is possible.
Example 7
In the above-described embodiment, the apparatus that efficiently guides wastewater to the valuable component has been described. However, instead of the valuable component, a pollution treatment facility 70 as shown in FIG. 7 may be provided. In this embodiment, when waste water containing polluted components that require waste water treatment is temporarily generated in a route where waste water that can be discharged is normally generated, the pollution treatment is set by the facility (pollution treatment device) 70. It is.

  In FIG. 7, the concentration line 1 and 2 (or only the concentration meter 1) as described in the embodiment 3 (FIG. 1 or 3) are provided in the factory drain line 6A. Further, on the downstream side of the concentration meter of the drainage line 6 </ b> A, a wastewater treatment system 61 is provided for draining the wastewater after guiding it to the pollution treatment device 70, or draining the wastewater without guiding it to the pollution treatment device 70. .

  The calculation unit 3 of the concentration measuring apparatus calculates the concentration value of each component from the actually measured values obtained by the two types of measurement methods that are input, and when at least one of them is equal to or higher than a predetermined concentration, the valve 12 is opened and the valve 11 is closed. Then, the waste water is guided to the pollution treatment device 70. When none of the concentration values of the components satisfy the predetermined concentration, the valve 12 is closed and the valve 11 is opened to control the switching of the drainage route for discharging the wastewater without passing through the pollution treatment device 70.

According to the present embodiment, the drainage route can be switched and the pollution process can be executed efficiently only when at least one of the components to be processed is detected at a certain concentration or more.
Example 8
An example in which the concentration measuring method and apparatus according to the present invention are applied to a regenerative deodorizing furnace is shown in FIG.

  The heat storage deodorizing furnace 80 contains a ceramic heat storage body (not shown). The VOC mixed gas introduced into the deodorizing furnace 80 is heated and oxidized in the process of passing through the heat accumulator, and after the heat is absorbed by the outlet heat accumulator, it is discharged out of the system. The untreated exhaust gas (VOC mixed gas) at the entrance of the deodorizing furnace takes heat from the heated heat accumulator and becomes a high temperature and is oxidized, and at the same time, the heat accumulator takes heat and the temperature is lowered. This “endotherm” and “heat dissipation” are repeated alternately.

  In the regenerative deodorization furnace, when the VOC gas self-combusts in the furnace and the furnace temperature exceeds a set value, the furnace temperature is controlled by drawing the combustion gas to a subsequent boiler. In this case, in the process in which the VOC concentration suddenly increases and the furnace temperature rapidly rises, there is a possibility that a time delay occurs in the control of the extraction amount of the combustion gas and the furnace temperature rises abnormally.

In the present embodiment, the VOC gas supply line 6 is provided with the concentration meters 1 and 2 (or the concentration meter 1 alone) described in the embodiment 1 or 2, and the calculation unit 3 uses these measured values. As described above, the concentration of each component of the VOC mixed gas is obtained, and the calorific value of the VOC gas is calculated from the component concentration and the VOC gas flow rate. And the furnace temperature is predicted based on this calorific value. When the calorific value exceeds the set point (when the furnace temperature is predicted to be higher than the predetermined temperature), the atmosphere suction damper 81 is opened and the atmosphere is sucked into the deodorizing furnace 80 for dilution in the furnace. This suppresses an abnormal rise in the furnace temperature.
Example 9
An example in which the concentration measuring method and apparatus according to the present invention are applied to operation control of a VOC gas concentrator is shown in FIG.

  For example, when exhaust gas treatment of VOC gas containing harmful air pollutants is performed by self-combustion (combustion method), if the concentration of the gas to be treated is low, a concentrator is installed to save energy, and the exhaust gas concentration is reduced to the self-combustion range. Enhancing the concentration process. In this case, the concentration of each component after concentration may exceed a preset control concentration (for example, a value about 1/4 to 1/3 of the explosion limit concentration). Therefore, in this embodiment, when there is a possibility of exceeding the set management concentration, operation control is performed so that the VOC gas concentration after the concentration does not exceed the management concentration after dilution by atmospheric suction.

  Specifically, the densitometers 1 and 2 (or the densitometer 1 alone) described in Example 1 or 2 are provided in the VOC gas supply line 6, and the calculation unit 3 uses these measured values. As described above, the concentration of each component of the VOC mixed gas is obtained. When the concentration of each component after concentration exceeds the preset management concentration, the atmospheric suction damper 81 is opened and the atmosphere is sucked into the concentrator 90 to dilute the concentrated gas so that the control concentration is not exceeded. To do. According to the present embodiment, even when the VOC gas upstream of the concentrator is discharged at a concentration exceeding the normal operation range, the concentrator is operated with the concentration factor kept on the safe side so as not to exceed the control concentration. Can do.

Schematic which shows an example of the apparatus which performs the density | concentration measuring method of this invention. The flowchart of the measuring method performed in FIG. Schematic which shows the other example of the apparatus which performs the density | concentration measuring method of this invention. Schematic which shows the other example of the apparatus which performs the density | concentration measuring method of this invention. The system outline figure of the gas turbine cogeneration equipment which applied the concentration measuring method concerning the present invention. The system outline figure of valuable component recovery equipment which applied the concentration measuring method concerning the present invention. The system outline figure of the pollution treatment equipment which applied the concentration measuring method concerning the present invention. The system outline figure of the deodorizing furnace which applied the concentration measuring method concerning the present invention. The system outline figure of the concentration device which applied the concentration measuring method concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Densitometer (infrared type densitometer), 2 ... Densitometer (FID type | mold densitometer), 3 ... Concentration calculating part, 6 ... VOC gas supply source, 50 ... Gas turbine cogeneration equipment, 60 ... Valuable component collection | recovery apparatus 70 ... Pollution treatment device, 80 ... Deodorizing furnace, 90 ... Concentration device.

Claims (12)

In a method for measuring the concentration of two components contained in a mixture,
Using two kinds of concentration measuring methods having different sensitivities to the two kinds of components, the apparent concentration of the mixture by each concentration measuring method is actually measured, and the apparent measured mixture concentration and the two kinds of concentrations are measured. A concentration measurement method for a mixed component system, wherein concentrations of two types of components are obtained using sensitivity of each component with respect to the measurement method.   2. The mixed component concentration measurement method according to claim 1, wherein the sensitivity of each of the two types of concentration measurement methods to each component to be measured is a relative sensitivity.   2. The mixing ratio of the two types of measured components is determined from the ratio of the actual values of the apparent concentrations obtained by the two types of concentration measuring methods and the relative sensitivity of each measured component with respect to the two types of concentration measuring methods. Using this mixing ratio, a correction coefficient for correcting an apparent mixture concentration actual measurement value actually measured by one of the two types of concentration measurement methods is obtained, and the corrected mixture concentration actual measurement value is obtained. A method for measuring the concentration of a mixed component system, wherein the concentration of each component is obtained. In any one of Claims 1 thru | or 3,
The mixture is a mixed gas containing two kinds of volatile organic compounds, and one of the two kinds of concentration measuring methods is an infrared concentration method using an infrared densitometer, and the other is A method for measuring the concentration of a mixed component system, which is a flame ionization detection method using a flame ionization detector. In any one of Claims 1 thru | or 3,
The two kinds of components to be measured have different sensitivities to two different wavelengths of infrared rays,
The two types of concentration measuring methods are respective infrared concentration measuring methods for actually measuring the apparent concentration of the mixture using infrared rays of the two different wavelengths. . In an apparatus for measuring the concentration of two components contained in a mixture,
Two types of concentration meters having different sensitivities to the two types of measured components;
A calculation unit that calculates the concentration of two types of components using the apparent mixture concentration actual value measured using the respective densitometers and the sensitivity of each component with respect to the two types of concentration measurement methods;
A mixed component concentration measuring apparatus comprising: In an apparatus for measuring the concentration of two components contained in a mixture,
A densitometer that measures the concentration of the mixture using two types of light having different wavelengths;
An arithmetic unit that calculates the concentration of two types of components using the apparent mixture concentration actual value measured using the light of the two different wavelengths and the sensitivity of each component to the different wavelengths;
A mixed component concentration measuring apparatus comprising: In a VOC mixed gas supply system that supplies a mixed gas containing two types of volatile organic compounds (hereinafter abbreviated as “VOC”) to an energy saving facility,
The concentration measuring apparatus for a mixed component system according to claim 6 or 7 installed in a VOC mixed gas supply line;
A flow meter installed in the VOC mixed gas supply line;
An arithmetic device that calculates the heat input amount of the energy saving facility based on the concentration value of each component of the VOC mixed gas calculated by the concentration measuring device and the VOC mixed gas flow rate value from the flow meter,
VOC mixed gas supply system characterized by comprising In a wastewater treatment control system equipped with a valuable component recovery device that recovers valuable components contained in factory wastewater,
The concentration measuring apparatus of the mixed component system according to claim 6 or 7 installed in a drain line of a factory,
When at least one of the concentration values of each component calculated by the concentration measuring device is equal to or higher than a predetermined concentration, the wastewater is led to the valuable component recovery device, and the concentration value of any component does not satisfy the predetermined concentration And a drain route switching device for draining the waste water without passing through the valuable component recovery device. In a wastewater treatment control system equipped with a wastewater treatment facility for treating pollutant components contained in factory wastewater,
The concentration measuring apparatus of the mixed component system according to claim 6 or 7 installed in a drain line of a factory,
When at least one of the concentration values of each component calculated by the concentration measuring device is equal to or higher than a predetermined concentration, the wastewater is guided to the wastewater treatment facility, and the concentration values of any component do not satisfy the predetermined concentration A drainage route switching device for draining the wastewater without passing through the wastewater treatment facility. In the combustion temperature control system used for the regenerative deodorization furnace that introduces the VOC mixed gas supplied from the factory and discharges the gas purified by high-temperature oxidative decomposition by the heat storage body,
The concentration measuring apparatus for a mixed component system according to claim 6 or 7 installed in a VOC mixed gas supply line;
A flow meter installed in the VOC mixed gas supply line;
An arithmetic device that calculates the calorific value of the VOC mixed gas based on the concentration value of each component of the VOC mixed gas calculated by the concentration measuring device and the VOC mixed gas flow rate from the flowmeter, and
A combustion temperature control system for a regenerative deodorization furnace, comprising: an air suction damper for diluting the inside of the deodorization furnace by air suction when the calorific value exceeds a set point. In the operation control system used in the concentrator that concentrates the VOC mixed gas sent from the factory,
The concentration measuring apparatus for a mixed component system according to claim 6 or 7 installed in a VOC mixed gas supply line;
If there is a possibility that the concentration of each component after concentration may exceed the preset control concentration, the concentration gas of the concentrator is pre-diluted by atmospheric suction so that the concentration of VOC gas after concentration does not exceed the control concentration. An atmospheric suction damper to control,
An operation control system for a VOC gas concentrating device.

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