WO2020171594A1 - Apparatus for continuously and automatically measuring fine dust in chimney exhaust gas - Google Patents

Abstract

Disclosed is an apparatus (10) for continuously and automatically measuring fine dust in chimney exhaust gas. The apparatus (10) for continuously and automatically measuring fine dust in chimney exhaust gas may comprise: a sample collection part (100) configured to collect exhaust gas samples in a chimney; and a sample branching/combining part (200) which is configured to, at one end in the travel direction of the exhaust gas samples, branch the exhaust gas samples collected from the sample collection part (100) into a plurality of lines, and, at the other end in the travel direction of the exhaust gas samples, combine the exhaust gas samples from the plurality of lines.

Description

Continuous automatic measuring device for fine dust of flue gas

The present invention relates to a continuous automatic measurement device for fine dust of a chimney exhaust gas, and more specifically, when collecting particulate matter such as fine dust from a flue exhaust gas, by sucking a constant velocity suction flow rate equal to the flow rate of the exhaust gas. By minimizing measurement errors and controlling the opening and closing of the first control valve provided in the control line while diverging the flow rate sucked at a constant velocity into the measurement line and the control line, a constant constant velocity suction flow required for the particle size separation device is introduced into the measurement line. The present invention relates to a continuous automatic measurement device for fine dust of chimney exhaust gas that enables continuous and automatic measurement of fine dust in exhaust gas.

In general, various types of exhaust gases harmful to the human body are discharged in a thermal power plant that burns fossil fuels to generate power using the thermal power, or an incinerator that incinerates industrial waste or general household waste. Such harmful substances may include particulate matter, halogenated gas, and combustion gases such as nitrogen oxide, sulfurous acid gas, carbon monoxide, hydrogen chloride, ammonia, and the like. When such harmful substances are absorbed and accumulated in the human body, they not only cause various diseases, but also adversely affect the natural environment, which has been proven through various investigations and experiments.

For this reason, in the case of incinerators and businesses that use fossil fuels around the world, the emission of harmful substances is regulated by strong laws, and even in Korea, the emission of harmful substances included in the emission gas is limited through a notification from the Ministry of Environment.

Until now, a method of measuring and managing Total Suspended Particles (TSP) has been used to measure harmful substances contained in exhaust gases emitted from chimneys such as thermal power plants and industrial plants, but it is very harmful to the human body. It is not possible to accurately and reliably measure fine dust (PM10) or ultrafine dust (PM2.5) that causes a problem.

In addition, the concentration of fine dust must be collected for a long time due to the characteristics of the collection, but due to the characteristics of the flow velocity of the exhaust gas that changes frequently during such a long time, the constant velocity flow condition in the gas sampling step and the constant velocity flow condition in the particle size separation stage are simultaneously A method, apparatus, or system to meet has so far been very poorly developed in the related field.

In order to measure fine dust, constant velocity suction is essential, and in order to separate and measure fine dust in the constant velocity suction process, particles must be separated by passing through a particle size separation device, but in a particle size separation device, a constant velocity suction flow rate must be sucked. It exists in this one process.

Therefore, the need for a new type of continuous automatic measuring device for fine dust in the flue exhaust gas capable of automatically and continuously measuring fine dust in the flue exhaust gas is considerably increasing in the art.

The present invention is to solve the above problems, the present invention is a chimney exhaust gas that minimizes the error in the measurement of fine dust by sucking through a suction nozzle at a constant flow rate equal to the flow rate of the exhaust gas when collecting a sample of the exhaust gas It is an object to provide a continuous automatic measuring device for fine dust.

In addition, the present invention controls the opening and closing of the first control valve provided in the control line in branching the sucked exhaust gas sample into the measurement line and the control line so that a constant speed flow rate is supplied to the particle diameter separation device provided in the measurement line. It is an object of the present invention to provide a continuous automatic measurement device for fine dust of flue gas, which enables precise separation of fine dust and continuous automatic measurement accordingly.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A continuous automatic measuring device for fine dust of a chimney exhaust gas according to an embodiment of the present invention for solving the above technical problem includes: a sample collecting unit configured to collect a sample of exhaust gas in the chimney; And branching the exhaust gas samples collected from the sample collection unit at one end in the traveling direction of the exhaust gas sample into a plurality of lines, and combining the exhaust gas samples from the plurality of lines at the other end in the traveling direction of the exhaust gas sample. It may include a sample branch / coupling portion configured.

More preferably, the plurality of lines of the sample branching/combining unit may include a measurement line in which a particle size separation device is provided in at least one area, and a control line in which a first control valve is provided in at least one area.

More preferably, the sample collection unit includes a suction pipe configured to suck an exhaust gas sample and transfer it to the sample branch/combination unit, and at one end of the suction pipe, a suction nozzle disposed in the chimney is provided, and of the suction nozzle The cross-sectional area may be dimensionally designed to suck the exhaust gas sample at a flow rate exceeding the constant flow rate required for the particle size separation device.

More preferably, the particle size separation device is implemented as a cascade impactor consisting of a PM10 impactor and a PM2.5 impactor, and accordingly, the constant flow rate required for the particle size separation device may be 16.67 ℓ/min. .

More preferably, the sample branching/combining unit includes: a dividing flow manifold configured to branch the exhaust gas sample collected from the sample collecting unit into the measurement line and the control line; And a combining flow manifold configured to combine the flow rate of the sample from the measurement line and the control line and transmit it to a constant velocity suction control unit at a rear stage.

More preferably, the measurement line further includes a first flow meter configured to measure the flow rate of the exhaust gas sample flowing through the measurement line, and the constant velocity suction control unit has a constant velocity of the exhaust gas sample output from the coupling manifold. A second flow meter configured to measure the suction flow rate may be provided.

More preferably, based on the flow rate measured by the first flow meter and the second flow meter, the first control valve so that the flow rate measured by the first flow meter corresponds to the constant speed flow rate required for the particle size separation device. It may further include a controller configured to control the opening and closing of.

More preferably, the controller is configured to open the first control valve when the flow rate measured by the first flow meter exceeds the constant speed flow rate required for the particle size separation device, and by the first flow meter It may be configured to close the first control valve when the measured flow rate is less than the constant velocity flow rate required for the particle size separation device.

More preferably, the distance between the separation manifold and the first control valve may be adjustable based on the pressure loss in the measurement line and the pressure loss in the control line.

According to the continuous automatic measurement of fine dust of the flue gas according to an embodiment of the present invention, when collecting a sample of the flue gas, the error in the measurement of fine dust is minimized by suctioning at a constant velocity through a suction nozzle equal to the flow rate of the exhaust gas. can do.

In addition, according to the continuous automatic measurement device for fine dust of the chimney exhaust gas according to an embodiment of the present invention, in branching the sucked exhaust gas sample into the measurement line and the control line, opening and closing of the first control valve provided in the control line By controlling the flow rate to be supplied to the particle size separation device provided in the measurement line, it is possible to precisely separate fine dust and continuous automatic measurement accordingly.

Brief description of each drawing is provided in order to more fully understand the drawings cited in the detailed description of the present invention.

1 is a schematic block diagram of an apparatus 10 for continuously measuring fine dust of a chimney exhaust gas according to an embodiment of the present invention.

2 is a detailed configuration diagram of a continuous automatic measurement device 10 for fine dust of a chimney exhaust gas according to an embodiment of the present invention.

3 is a conceptual diagram for explaining an embodiment of implementing a constant flow rate of the measurement line 220 by the opening and closing operation of the first control valve 231 according to an embodiment of the present invention.

4 is a conceptual diagram illustrating a variable distance adjustment between the separation manifold 210 and the first control valve 231 according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function obstructs an understanding of the embodiment of the present invention, the detailed description thereof will be omitted. In addition, embodiments of the present invention will be described below, but the technical idea of the present invention is not limited thereto or is not limited thereto, and may be modified and variously implemented by those skilled in the art.

Throughout the specification, when a part is said to be "connected" with another part, this includes not only "directly connected" but also "indirectly connected" with another element interposed therebetween. . Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated. In addition, in describing the constituent elements of the embodiment of the present invention, terms such as first, second, A, B, (a), (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term.

1 is a schematic block diagram of an apparatus 10 for continuously measuring fine dust of a chimney exhaust gas according to an embodiment of the present invention. As shown in Fig. 1, the apparatus 10 for continuous automatic measurement of fine dust of the flue gas according to an embodiment of the present invention includes a sample collection unit 100, a sample branch/combination unit 200, and a pretreatment unit. It may be composed of 300, a gas measurement unit 400, a constant velocity suction control unit 500, a controller 600, and the like. For reference, the elements 100, 200, 300, 400, 500, 600 shown in FIG. 1 are the operation, function, etc. of the continuous automatic measurement device 10 for fine dust of the flue gas according to an embodiment of the present invention. It will be apparent that it corresponds to an exemplary element for explaining, and therefore additional elements (eg, a power supply unit, an alarm unit, a monitoring unit, etc.) not shown in FIG. 1 may be further provided.

At least a portion of the sample collection unit 100 is disposed in the chimney 1 to collect a sample of exhaust gas in the chimney 1. For reference, in collecting exhaust gas samples for the measurement of fine dust, constant velocity suction is very important, because when the exhaust gas is sucked at a faster rate than the exhaust gas flow rate, the surrounding fine particles are first sucked. This is because when is shown at a lower concentration than the actual concentration, and when suction is performed at a lower velocity than the exhaust gas flow rate, large particles are first sucked by the inertial force, and the result is measured at a higher concentration than the actual value. This constant velocity suction flow condition in the sample collection unit 100 may be implemented by the constant velocity suction control unit 500 according to the control signals i ₅₂₀ and/or i ₅₃₀ output from the controller 600, and for this It will be described in more detail in the following.

For reference, as shown in FIG. 1, in contrast to the sample collection unit 100 in which at least a part of the area is disposed inside the chimney 1, the remaining elements, that is, the sample branch/combination unit 200, and the pretreatment unit ( 300), the gas measuring unit 400, the constant velocity suction control unit 500, the controller 600, and the like may be disposed outside the chimney 1. In particular, the sample branch/couple 200 provided with the particle diameter separation device 221 is disposed outside the chimney 1 to enable continuous measurement of fine dust, which will be described in more detail below. .

The sample branching/combining unit 200 divides the exhaust gas sample collected from the sample collection unit 100 at one end in the traveling direction of the exhaust gas sample into a plurality of lines, and from a plurality of lines at the other end in the traveling direction of the exhaust gas sample. The exhaust gas samples of can be combined. The plurality of lines provided in the sample branching/combining unit 200 may include at least a measurement line 220 (see FIG. 2 below) and a control line 230 (see FIG. 2 below), and the control line 230 ) By controlling the opening and closing of the first control valve 231 (refer to FIG. 2 below) disposed in the particle diameter separation device 221 (refer to FIG. 2 below) disposed in the measurement line 220. 16.67 ℓ/min, etc.) may be supplied, and opening and closing of the first control valve 231 may be implemented by a control signal i ₂₃₁ output from the controller 600. A more detailed description of the operation, function, and the like of the specimen branch/coupler 200 will be described later.

The pretreatment unit 300 may perform a function of removing moisture contained in the exhaust gas output from the sample branch/combination unit 200, and accordingly, the gas measurement unit 400 disposed at the rear end of the exhaust gas progress direction It is possible to protect the constant velocity suction control unit 500. A more detailed description of the operation, function, and the like of the preprocessor 300 will be described later.

The gas measuring unit 400 may measure a gas, for example, a gas such as oxygen (O ₂ ), carbon dioxide (CO ₂ ), and the like. To this end, the gas measurement unit 400 may include an oxygen sensor, a carbon dioxide sensor, and the like, and a more detailed description of the operation, function, and the like of the gas measurement unit 400 will be described again below.

The constant velocity suction control unit 500 may control the opening and closing of the valve and/or the pressure of the pump to satisfy the constant velocity flow suction condition in the sample collection unit 100, which is a control signal output from the controller 600 (i ₅₂₀ And/or i ₅₃₀ ). A more detailed description of the operation, function, and the like of the constant velocity suction control unit 500 will be described again below.

The controller 600 includes a first control valve 231 in the sample branch/coupler 200 so that the constant velocity suction flow condition in the sample collection unit 100 and the constant velocity suction flow condition in the particle size separation device 221 are satisfied. ) Open/close control (for example, by a control signal (i ₂₃₁ )), and valve open/close control and/or pump pressure control in the constant velocity suction control unit 500 (for example, control signals (i ₅₂₀ and/or i ₅₃₀₎ ) By). For reference, the controller 600 may be implemented in other device types such as a micro-controller, a processor, or a micro-processor according to various embodiments or embodiments.

2 is a detailed configuration diagram of a continuous automatic measurement device 10 for fine dust of a chimney exhaust gas according to an embodiment of the present invention. As already described with reference to FIG. 1, the apparatus 10 for continuously measuring fine dust of flue gas according to an embodiment of the present invention includes at least a part of a sample collecting unit disposed inside the chimney 1 ( 100) and a sample branch/combination unit 200 disposed outside the chimney 1, a pretreatment unit 300, a gas measurement unit 400, a constant velocity suction control unit 500, and a controller 600. .

The sample collection unit 100 may be configured to collect a sample of exhaust gas in the chimney, and as shown in FIG. 2, the sample collection unit 100 includes a suction tube 110, a Pitot tube 120, and a thermometer 130. Wow, it may be composed of a heating device 140, and the like.

For reference, in order to analyze and measure particulate matter such as fine dust in the exhaust gas, it is desirable to collect the exhaust gas from the discharge origin, such as a chimney.This is because the fine dust density condition of the exhaust gas in the chimney is uniform. This is because it is very different from a normal atmosphere. Therefore, since the exhaust gas that deviates from the emission origin such as the chimney is mixed with the general atmosphere and the density is lowered, it is preferable to perform sampling at the emission origin such as the chimney before the exhaust gas is mixed with the general atmosphere.

In FIG. 2, as an element for measuring the exhaust gas flow rate in the chimney 1, a pitot tube 120 meeting the standards of the domestic process test method is illustrated as an example. For reference, the Pitot tube 120 is a device installed inside the flowing fluid and configured to measure the velocity of the fluid, and a law in which the pressure difference inside/outside the Pitot tube 120 is proportional to the square of the fluid velocity, that is, Bernoulli's law ( The velocity of the fluid can be obtained according to Bernoulli's equation.

According to another embodiment of the present invention, it is possible to measure the exhaust gas flow rate in the chimney 1 using a mass flow meter (MFM) for a chimney in place of the Pitot tube 120.

The suction pipe 110 is provided with a suction nozzle 111 disposed in at least a portion of the chimney 1 at one end thereof, and the other end thereof is a sample branch/combination part 200 and, more specifically, a separation manifold 210 ) And the exhaust gas sample in the chimney may be delivered to the sample branch/coupler 200 through the suction pipe 110. Here, the cross-sectional area of the suction nozzle 111 is characterized in that it is dimensionally designed to suck the exhaust gas sample at a flow rate exceeding the constant flow rate required for the particle size separation device 221.

For example, based on the design capacity of the chimney 1, operation information (flow rate, flow rate, etc.) of the chimney 1, the exhaust gas sample at a flow rate exceeding the constant flow rate required by the particle size separation device 221 The cross-sectional area of the suction nozzle 111 may be determined so that the suction nozzle 111 can be sucked at a constant velocity, and the particle diameter separation device 221 is a cascade impactor composed of a PM10 impactor 221a and a PM2.5 impactor 221b. In the case of implementation, the constant flow rate required for such a cascade-impacter may be 16.67 l/min.

For reference, in the following specification, the particle size separation device 221 in which the PM10 impactor 221a and the PM2.5 impactor 221b are connected in series is described, but in another embodiment of the present invention, the particle size separation device 221 is Only one of the PM10 impactor 221a and the PM2.5 impactor 221b may be provided, or an additional impactor, for example, a PM1.0 impactor may be further provided.

Therefore, according to the present invention, the cross-sectional area of the suction nozzle 111 can be determined to suck the exhaust gas sample at a constant velocity at a flow rate exceeding the constant velocity flow rate required by the particle size separation device 221 based on the design capacity of the chimney 1, etc. Accordingly, a constant flow rate required for particle size separation can be stably supplied to the particle size separation device 221 by a branching operation in the separation manifold 210.

For example, in the case of a power plant operating at an outlet flow rate of 5 m/sec to 10 m/sec in the range of 120°C to 180°C, if the diameter of the suction nozzle is selected as 10 mm, the constant velocity suction flow rate (for reference, process test method According to the permissible range of 95% to 110%) can be set to 17.5 ℓ/min to 34 ℓ/min, under these conditions, if the outlet flow rate is 8.5 m/sec and the discharge temperature is 150°C, the constant velocity suction flow rate is 29.2 It can be calculated as ℓ/min. Therefore, when a constant velocity suction flow of 29.2 L/min occurs in the sample collection unit 100 under the conditions of an outlet flow velocity of 8.5 m/sec, a discharge temperature of 150° C., and a nozzle diameter of 10 mm, the measurement according to the control of the constant velocity suction control unit 500 It is characterized in that the constant velocity suction flow rate of 16.67 L/min flows through the line 220 and the rest is bypassed through the control line 230. This will be described later again.

In this regard, in some cases, the total flow rate (Q _Total ) measured by the second flow meter 510 due to various causes within the chimney is a constant flow rate required for the particle size separation device 221 (eg, 16.67 ℓ/min). May be less than. If the constant velocity flow condition required for the particle size separation device 221 is not satisfied, the particle separation and measurement by the particle size separation device 221 may be regarded as a virtually meaningless operation, so the total flow rate measured by the second flow meter 510 When (Q _Total ) falls below a constant flow rate (for example, 16.67 ℓ/min) required for the particle size separation device 221, the controller 600 according to a further embodiment of the present invention is an alarm unit (not shown). By activating, it is possible to notify a user or the like of a drop below the constant flow rate, or the operation of the continuous automatic measurement device 10 for fine dust of the present flue gas may be temporarily suspended. In order to cope with this problem, the diameter of the suction nozzle 111 may be increased by one level, for example, a suction nozzle 111 having a diameter of 12 mm may be replaced and used.

The heating device 140 may be implemented while surrounding at least a portion of the outer circumferential surface of the suction pipe 110, and to prevent condensation of moisture during the transport of the exhaust gas sample, heat from a heat source (not shown) is absorbed by the suction pipe 110. Can be delivered to the sample of exhaust gas inside.

In addition, a thermometer 130 may be additionally disposed in at least a partial region along the longitudinal direction of the suction pipe 110, more preferably near the boundary between the inner region and the outer region of the chimney 1, and the thermometer 130 May measure the temperature of the suction pipe 110 and transmit the measured temperature value to another element, for example, to the controller 600 wirelessly or by wire.

In this regard, the sample collection unit 100 according to an embodiment of the present invention is more specifically configured to measure fine dust by sucking the exhaust gas sample at a constant flow rate equal to the flow rate of the exhaust gas through the suction nozzle 111. The error can be minimized, and the constant velocity flow rate here supplies a flow rate exceeding the constant velocity flow rate required for the particle size separation device 221, and the constant velocity suction flow rate condition in the suction nozzle 111 is provided in the constant velocity suction control unit 500 It may be implemented by opening and closing of the second control valve 520 and/or controlling the pressure of the suction pump 530, which is based on the control signals i ₅₂₀ and/or i ₅₃₀ output from the controller 600. I can.

For example, based on the flow rate (Q _Total ) measured by the second flow meter 510 provided in the constant velocity suction control unit 500, the suction pump 530 provided in the constant velocity suction control unit 500 generates a constant power. By controlling the opening and closing of the second control valve 520 while outputting, or by adjusting the power of the suction pump 530 itself provided in the constant velocity suction control unit 500 (in this case, the second control valve 520 will be omitted. May) It is possible to implement a constant velocity flow rate collection in the sample collection unit 100. In addition, according to a further embodiment of the present invention, in order to implement a constant velocity flow rate collection in the sample collection unit 100, the flow rate Q measured by the second flow meter 510 provided in the constant velocity suction control unit 500 _Total ), as well as controlling the opening and closing of the second control valve 520, a method of simultaneously controlling the pressure of the pump may be used.

As described above, when the exhaust gas sample is sucked at a constant flow rate in the sample collection step by the sample collection unit 100, the exhaust gas sample thus sucked is transferred to the sample branch/combination unit 200 through the suction pipe 110. Can be. More specifically, the sample branching/combining unit 200 diverges the exhaust gas sample retaken from the sample collection unit 100 at one end in the traveling direction of the exhaust gas sample into a plurality of lines, and a plurality of the exhaust gas samples at the other end in the traveling direction of the exhaust gas sample It can be configured to combine the sample of exhaust gas from the line of. For reference, in order to aid in an easier understanding of the present invention, the measurement line 220 and the control line 230 are exemplary as a plurality of lines implemented in the sample branch/combination unit 200 in the following specification. Although described, the number of lines constituting a plurality of lines may be different according to various embodiments or implementations.

As shown in FIG. 2, the plurality of lines of the sample branching/combining unit 200 according to an embodiment of the present invention include a measurement line 220 having a particle size separation device 221 in at least one area, It may include a control line 230 in which the first control valve 231 is provided in at least one area, and the sample branching/combining unit 200 is a measurement line for measuring the exhaust gas sample collected from the sample collecting unit 100. It may further include a separation manifold 210 branching to 220 and the control line 230.

Here, a number of devices such as a particle size separation device 221, a fine dust measurement sensor 222, a first flow meter 223, and the like are attached to the measurement line 220, whereas only a first control valve is attached to the control line 230. Only 231 is provided, and accordingly, the pressure loss in the measurement line 220 may be greater than the pressure loss in the control line 230. Accordingly, if the force is the same, the transfer of the fluid to the control line 230 having less pressure loss may be greater. According to the difference in pressure loss between the measurement line 220 and the control line 230, FIG. 2 exemplarily shows a configuration in which the first control valve 231 is spaced apart from the separation manifold 210 by a predetermined distance. do.

In this regard, according to an embodiment of the present invention, based on the pressure loss in the measurement line 220 and the pressure loss in the control line 230, the separation manifold 210 and the first control valve 231 It is characterized in that the distance between them is adjustable, and FIG. 4 corresponds to a conceptual diagram for explaining the variable distance adjustment between the separation manifold 210 and the first control valve 231 according to an embodiment of the present invention.

According to an embodiment of the present invention, the separation manifold is based on the actual pressure loss in the measurement line 220 and/or the actual pressure loss in the control line 230, more preferably based on the difference in pressure loss. The distance between the 210 and the first control valve 231 may be adjustable, and in (a) of FIG. 4, the first control valve 231 is approximately equal to the separation manifold 210 and the coupling manifold 240. An example of a configuration disposed in the middle region is shown, and (b) of FIG. 4 exemplarily shows a configuration in which the first control valve 231 is disposed close to the separation manifold 210 side. (c) exemplarily shows a configuration in which the first control valve 231 is disposed distal to the separation manifold 210.

Implementation of FIG. 4 in which the distance between the separation manifold 210 and the first control valve 231 is variably adjusted based on the pressure loss in the measurement line 220 and/or the pressure loss in the control line 230 In addition to or alternatively to the example, according to another embodiment of the present invention, the inlet inner diameter of the measurement line 220 is controlled based on the pressure loss in the measurement line 220 and/or the pressure loss in the control line 230. It may be implemented differently from the inner diameter of the inlet portion of the line 230, or an orifice may be installed therein.

The measurement line 220 is a line (or path) for separating and measuring fine dust, and may be composed of a particle size separation device 221, a fine dust measurement sensor 222, a first flow meter 223, and the like. have.

The particle size separation device 221 may be appropriately selected according to the particulate matter to be measured. For example, when measuring fine dust, the particle size separation device 221 uses the inertial force of the particles and A cyclone using centrifugal force can be used. In addition, it is possible to select PM10, PM2.5, etc. according to the size of the particle diameter to be measured, and in the following specification, the particle diameter separation device 221 is a PM10 impactor (221a) and PM2. An example implemented as a cascade-impacter composed of 5 impactors 221b will be described.

For reference, the impactor uses the law of inertial collision of particles to rapidly change the direction of fluid flow, the principle that heavy particles go straight to the collection tube and are collected by gravity and inertial force, whereas light particles proceed with the fluid. Because of the use of the fluid inlet speed, device structure, dimensional design, etc. are very important.

The fine dust measuring sensor 222 is a device for measuring fine dust, and, for example, a filter for a gravimetric method, a beta-ray sensor, a light scattering sensor, and the like may be applied.

The first flow meter 223 is a device for measuring the flow rate in the measurement line 220, for example, a mass flow meter (MFM) may be used. For reference, mass is a standard for measurement in which the unit of measurement is not derived from other physical quantities, and forms the basis of all physical measurements along with units such as length, time, etc., and mass flowmeters measure the mass of such an invariant. It has the advantage of being linear without calculation and no correction for fluid properties.

In addition, the mass flow meter is a flow meter that measures the mass flow rate rather than the volume flow rate of a fluid. A direct mass flow meter, a volume flow meter, and a density meter that detects an amount largely proportional to the mass flow rate. It can be classified as an indirect mass flow meter that measures mass flow by combining it. For example, direct mass flow meters include thermal mass flow meters, differential pressure mass flow meters, Coriolis mass flow meters, angular momentum mass flow meters, gyro mass flow meters, turbine mass flow meters, and the like.

In addition, the mass flowmeter according to an embodiment of the present invention may be implemented to operate in a digital mode or an analog mode, and an operation mode may be switched between a digital mode and an analog mode, and the switching of such an operation mode is performed by the controller 600 ) Can be implemented by

The device 10 for continuous automatic measurement of fine dust of the flue gas according to an embodiment of the present invention is characterized in that a constant flow rate is supplied to the particle size separation device 221, whereby the particle size separation device 221 In case of a cascade-impacter, it is preferable that the first flow meter 223 always detects a value of 16.67 L/min as a constant speed flow rate, and when the flow rate value of the first flow meter 223 exceeds or falls below 16.67 L/min, the control line By controlling the opening and closing of the first control valve 231 provided in 230, the flow rate value of the first flow meter 223 can be corrected by 16.67 ℓ/min, and this correction/control operation implemented by the controller 600 It will be described in more detail with reference to FIG. 3 below.

The control line 230 corresponds to the remaining lines excluding the measurement line 220 from the plurality of lines provided in the sample branch/combination unit 200, and in FIG. 2, one line is illustratively used as the control line 230. Although shown, according to a further embodiment of the present invention, the control line 230 may be implemented as a plurality of lines (eg, two lines, three lines, etc.).

The control line 230 may be provided with a first control valve 231, and the distance between the first control valve 231 and the separation manifold 210 is a pressure loss in the measurement line 220 and/or It is already described that it is variably adjustable based on the pressure loss in the control line 230. In addition, by controlling the opening and closing of the first control valve 231 provided in the control line 230, the constant speed flow rate condition of the particle size separation device 221 provided in the measurement line 220 can be satisfied, and the first control valve The opening and closing control control of the ₂₃₁ may be possible by a control signal i ₂₃₁ output from the controller 600.

3 is a conceptual diagram for explaining an embodiment of implementing a constant flow rate of the measurement line 220 by the opening and closing operation of the first control valve 231 according to an embodiment of the present invention. When the particle size separation device 221 is a cascade-impacter, the constant flow rate required for the particle size separation device 221 is 16.67 ℓ/min, and for accurate detection and measurement of fine dust, the constant flow rate condition in the particle size separation device 221 ( 16.67 ℓ/min) must be observed.

As illustrated in (a) of FIG. 3, the summation flow rate (Q _Total ) is measured at 20 ℓ/min by the second flow meter 510 provided in the constant velocity suction control unit 500, and the measurement line 220 When the flow rate of the particle size separation device 221 is measured as 15 L/min by the provided first flow meter 223, the controller 60 determines that there is a flow rate of 5 L/min in the control line 230. I can.

Therefore, in order to meet the constant flow rate condition of 16.67 L/min in the particle size separation device 221 implemented as a cascade-impacter, the controller 600 controls 1.67 L/min at the 5 L/min flow rate of the control line 230. In order to decrease and increase 1.67 L/min at the 15 L/min flow rate of the measurement line 220, the first control valve 231 may be further closed.

Similarly, as illustrated in (b) of FIG. 3, the summation flow rate (Q _Total ) is measured as 20 ℓ/min by the second flow meter 510 provided in the constant velocity suction control unit 500, and the measurement line ( When the flow rate of the particle size separation device 221 is measured as 18 L/min by the first flow meter 223 provided in 220), the controller 60 has a flow rate of 2 L/min in the control line 230 You can judge that there is.

Therefore, in order to meet the constant flow rate condition of 16.67 L/min in the particle size separation device 221 implemented as a cascade-impacter, the controller 600 controls 1.33 L/min at the 2 L/min flow rate of the control line 230. In order to increase and decrease 1.33 L/min at the flow rate of 18 L/min of the measurement line 220, the first control valve 231 may be controlled to be further opened.

In summary, the controller 600 according to an embodiment of the present invention is based on the flow rate measured by the first flow meter 223 and the second flow meter 510 (ie, Q ₂₂₀ , Q _Total ), the first flow meter ( Opening and closing of the first control valve 231 may be controlled so that the flow rate measured by 223 corresponds to a constant speed flow rate (eg, 16.67 L/min) required for the particle size separation device 221.

More specifically, the controller 600 opens the first control valve 231 when the flow rate measured by the first flow meter 223 exceeds the constant speed flow rate required for the particle size separation device 221, and the first flow meter When the flow rate measured by 223 is less than the constant speed flow rate required for the particle size separation device 221, the first control valve 231 may be closed.

For reference, in performing the flow rate branching and adjustment of a plurality of lines as described above, it is also important to additionally consider the pressure loss of the measurement line 220 and/or the control line 230, for example, measurement The configuration in which the distance between the separation manifold 210 and the first control valve 231 can be variably adjusted based on the pressure loss in the line 220 and/or the pressure loss in the control line 230 has already been described. same.

The coupling manifold 240 combines the sample flow rate from the measurement line 220 and the control line 230 and transmits it to the pretreatment unit 300, the gas measurement unit 400, the constant velocity suction control unit 500, etc. Can be configured.

The pretreatment unit 300 may be composed of a cooler 310 and a discharge pump 320. The pretreatment unit 300 may perform pretreatment for normal measurement and/or control operation in the gas measurement unit 400 and/or the constant velocity suction control unit 500. For example, the pretreatment unit 300 removes moisture Can be implemented.

For example, a gas sensor is used to measure an exhaust gas component in the gas measurement unit 400, and in general, the gas sensor is greatly affected by moisture. Accordingly, in order to reduce measurement errors and failures of the gas sensor due to moisture, the pretreatment unit 300 may remove moisture from the exhaust gas output through the coupling manifold 240. When the exhaust gas containing a large number of moisture passes through the cooler 310, moisture is condensed and converted into water, and the converted water is discharged to the outside through the discharge pump 320, thereby removing moisture from the exhaust gas.

The gas measurement unit 400 may include various types of gas sensors, and in this specification, the oxygen sensor 410 and the carbon dioxide sensor 420 are exemplarily described to correct air density in relation to the calculation of the constant velocity suction flow rate. I will do it. The oxygen sensor 410 corresponds to a device for measuring oxygen in the exhaust gas, and the carbon dioxide sensor 420 corresponds to a device for measuring carbon dioxide in the exhaust gas. For reference, since moisture is removed by the pretreatment unit 300 at the front end of the gas measurement unit 400, sensors such as the oxygen sensor 410 and the carbon dioxide sensor 420 may be removed even if the moisture of the target gas is removed. It can be implemented as a sensor device that conforms to the characteristics of a gas that does not cause overmeasurement errors.

The constant velocity suction control unit 500 may control the operation of the second control valve 520 and/or the suction pump 530 in order to satisfy the constant velocity flow rate condition in the sample collection unit 100. For example, based on the flow rate (Q _Total ) measured by the second flow meter 510 provided in the constant velocity suction control unit 500, the suction pump 530 provided in the constant velocity suction control unit 500 generates a constant power. By controlling the opening and closing of the second control valve 520 while outputting, or by adjusting the power of the suction pump 530 itself provided in the constant velocity suction control unit 500 (in this case, the second control valve 520 will be omitted. May) It is possible to implement a constant velocity flow rate collection in the sample collection unit 100. In addition, according to a further embodiment of the present invention, in order to implement the constant velocity flow rate in the sample collection unit 100, the flow rate measured by the second flow meter 510 provided in the constant velocity suction control unit 500 (Q _Total ) Based on the method of controlling the opening and closing of the second control valve 520 and simultaneously controlling the pressure of the pump.

Here, the second flow meter 510 may be a mass flow meter, or a dry flow meter, which is relatively inexpensive, may be used in general since moisture from the gas is removed from the pretreatment unit 300.

As described above, according to the continuous automatic measuring device for fine dust of the flue gas according to an embodiment of the present invention, when collecting a sample of the flue gas, fine dust is sucked at a constant velocity through a suction nozzle equal to the flow rate of the exhaust gas. Measurement errors can be minimized.

In addition, according to the continuous automatic measurement device for fine dust of the chimney exhaust gas according to an embodiment of the present invention, in branching the sucked exhaust gas sample into the measurement line and the control line, opening and closing of the first control valve provided in the control line By controlling the flow rate to be supplied to the particle size separation device provided in the measurement line, it is possible to precisely separate fine dust and continuous automatic measurement accordingly.

Meanwhile, the various embodiments described in the present specification may be implemented by hardware, middleware, microcode, software, and/or a combination thereof. For example, various embodiments include one or more application specific semiconductors (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs). ), processors, controllers, microcontrollers, microprocessors, other electronic units designed to perform the functions presented herein, or a combination thereof.

Further, for example, various embodiments may be embodied or encoded on a computer-readable medium containing instructions. Instructions embodied or encoded on a computer-readable medium may cause a programmable processor or other processor to perform a method, for example, when the instructions are executed. Computer-readable media includes computer storage media, and computer storage media may be any available media that can be accessed by a computer. For example, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage medium, magnetic disk storage medium, or other magnetic storage device.

Such hardware, software, firmware, and the like may be implemented within the same device or within separate devices to support the various operations and functions described herein. Additionally, components, units, modules, components, and the like described as "units" in the present invention may be implemented together or separately as interoperable logic devices. The description of different features for modules, units, etc. is intended to highlight different functional embodiments, and does not necessarily imply that they must be realized by separate hardware or software components. Rather, functionality associated with one or more modules or units may be performed by separate hardware or software components or may be integrated within common or separate hardware or software components.

Although the operations are shown in the figures in a specific order, it should not be understood that these operations are performed in the specific order shown, or in a sequential order, or that all illustrated operations need to be performed to achieve the desired result. . In any environment, multitasking and parallel processing can be advantageous. Moreover, the division of various components in the above-described embodiments should not be understood as requiring such division in all embodiments, and the described components are generally integrated together into a single software product or packaged into multiple software products. It should be understood that you can.

As described above, an optimal embodiment has been disclosed in the drawings and specifications. Although specific terms have been used herein, these are only used for the purpose of describing the present invention, and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

1: chimney 10: continuous automatic measuring device for fine dust of flue gas

100: sample collection unit 110: suction tube

111: suction nozzle 120: Pitot tube

130: thermometer 140: heating device

200: sample branch/couple 210: separation manifold

220: measuring line 221: particle size separation device

221a: PM10 impactor 221b: PM2.5 impactor

222: fine dust measurement sensor 223: first flow meter

230: control line 231: first control valve

240: coupling manifold 300: pretreatment unit

310: cooler 320: discharge pump

400: gas measuring unit 410: O ₂ sensor

420: CO ₂ sensor 500: constant velocity suction control unit

510: second flow meter 520: second control valve

530: suction pump 600: controller

Claims (9)

1. As a continuous automatic measurement device 10 for fine dust of flue gas,

   A sample collection unit 100 configured to collect a sample of exhaust gas in the chimney; And

   The exhaust gas samples collected from the sample collection unit 100 are branched into a plurality of lines at one end in the traveling direction of the exhaust gas sample, and the exhaust gas samples from the plurality of lines are taken at the other end in the traveling direction of the exhaust gas sample. Including a sample branch / coupling portion 200 configured to be coupled,

   A continuous automatic measuring device for fine dust of the flue gas (10).
2. The method of claim 1,

   The plurality of lines of the sample branch/coupler 200,

   A measurement line 220 provided with a particle size separation device 221 in at least one area, and

   Including a control line 230 in which the first control valve 231 is provided in at least one region,

   A continuous automatic measuring device for fine dust of the flue gas (10).
3. The method of claim 2,

   The sample collection unit 100 includes a suction pipe 110 configured to suck an exhaust gas sample and transfer it to the sample branch/combination unit 200, and at one end of the suction pipe 110, a suction pipe disposed in the chimney A nozzle 111 is provided,

   The cross-sectional area of the suction nozzle 111 is dimensionally designed to suck the exhaust gas sample at a flow rate exceeding the constant flow rate required for the particle size separation device 221,

   A continuous automatic measuring device for fine dust of the flue gas (10).
4. The method of claim 3,

   The particle size separation device 221 is implemented as a cascade impactor consisting of a PM10 impactor 221a and a PM2.5 impactor 221b, and accordingly, the constant flow rate required for the particle size separation device 221 is Characterized in that 16.67 l/min,

   A continuous automatic measuring device for fine dust of the flue gas (10).
5. The method of claim 3,

   The sample branch/combination part 200,

   A separation manifold (210; dividing flow manifold) configured to branch the exhaust gas sample collected from the sample collection unit 100 into the measurement line 220 and the control line 230; And

   Including a combining flow manifold (240) configured to combine the flow rate of the sample from the measurement line 220 and the control line 230 and transmit it to the constant velocity suction control unit 500 at the rear end,

   A continuous automatic measuring device for fine dust of the flue gas (10).
6. The method of claim 5,

   The measurement line 220 is further provided with a first flow meter 223 configured to measure the flow rate of the exhaust gas sample flowing through the measurement line 220,

   The constant velocity suction control unit 500 is provided with a second flow meter 510 configured to measure the constant velocity suction flow rate of the exhaust gas sample output from the coupling manifold 240,

   A continuous automatic measuring device for fine dust of the flue gas (10).
7. The method of claim 6,

   Based on the flow rate measured by the first flow meter 223 and the second flow meter 510, the flow rate measured by the first flow meter 223 is equal to the constant speed flow rate required for the particle size separation device 221 Further comprising a controller 600 configured to control the opening and closing of the first control valve 231 to correspond,

   A continuous automatic measuring device for fine dust of the flue gas (10).
8. The method of claim 7,

   The controller 600 is configured to open the first control valve 231 when the flow rate measured by the first flow meter 223 exceeds the constant speed flow rate required for the particle size separation device 221, And configured to close the first control valve 231 when the flow rate measured by the first flow meter 223 is less than the constant speed flow rate required for the particle size separation device 221,

   A continuous automatic measuring device for fine dust of the flue gas (10).
9. The method of claim 5,

   Based on the pressure loss in the measurement line 220 and the pressure loss in the control line 230, the distance between the separation manifold 210 and the first control valve 231 is adjustable. doing,

   A continuous automatic measuring device for fine dust of the flue gas (10).

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