KR102435831B1 - Apparatus for diluting exhaust gas - Google Patents

Abstract

The present invention relates to an exhaust gas dilution device, and the exhaust gas dilution device according to an embodiment of the present invention includes a head in which exhaust gas is introduced from the outside, a through hole is formed, and is coupled to a front end of the head and provides primary dilution air. The ejector unit guides the inflow and movement and has a first discharge hole connected to the through hole, is inserted into the first discharge hole through the through hole, and the primary dilution air moves through the first discharge hole a nozzle unit for guiding the exhaust gas introduced into the head unit to be ejected toward the front of the ejector unit through a second discharge hole due to a pressure drop at the front end of the ejector unit, coupled to the front end of the ejector unit, the exhaust gas and the primary The dilution part is formed at the rear end of the dilution part and the head part for generating the secondary dilution gas by supplying secondary dilution air to the primary dilution gas mixed with the dilution air, and to reduce the flow rate of the inflowing exhaust gas to remove stagnant air. It is characterized in that it comprises a stagnant air forming portion to be formed and introduced to the head portion.

Description

Exhaust gas dilution device {APPARATUS FOR DILUTING EXHAUST GAS}

The present invention relates to an exhaust gas dilution device, and more particularly, to measure the concentration of particles contained in the exhaust gas, by diluting the high concentration exhaust gas according to the measurement range of the particle counter to increase the measurement precision even for the high concentration exhaust gas It relates to an exhaust gas dilution device that can be raised.

When the concentration of sampled particles exceeds the measurement range of the particle counter, the particle dilution device is installed at the front of the particle counter to dilute the sampled particles at a constant dilution ratio and then transfers them to the particle counter to measure even high-concentration sampled particles. It is a device that allows you to

In order to increase the accuracy of measurement in the environment inside the chimney in a high temperature, high moisture, and high concentration environment, dilution should be performed while minimizing the generation of droplets. Furthermore, it is necessary to increase the accuracy of measurement by maximally suppressing the occurrence of particle loss according to the structure of the dilution device.

In addition, in order to accurately measure the concentration of fine particles in an industrial emission facility such as a chimney, it is very important to satisfy a constant velocity suction condition that equals the particle sampling flow rate with the exhaust gas flow in the chimney. This is because, if the constant velocity suction condition is not satisfied, more or less sampling is performed, and the measured particle concentration is distorted, resulting in a difference from the actual particle concentration inside the chimney.

Furthermore, the flow velocity of exhaust gas in the chimney of an industrial site is variably changed according to the situation. The particle counter measures the particle concentration of the diluted dilution gas and converts the concentration of the target particle based on this. If it is changed, an error may occur in the measured value of particle concentration.

Therefore, in order to accurately sample particles in a chimney under high temperature, high humidity and high concentration conditions, constant velocity suction must be possible while maintaining a constant dilution ratio, and complex conditions such as no condensation of moisture must be satisfied.

Republic of Korea Patent Publication No. 2013-0059592 (published on June 7, 2013)

Accordingly, an object of the present invention is to solve such a problem in the prior art, and a stagnant air forming unit for forming stagnant air by decelerating the flow rate of exhaust gas at the rear end is provided so that a certain amount of exhaust gas is sucked at a constant velocity, dilution It is to provide an exhaust gas dilution device capable of increasing the precision of particle measurement because particle sampling is possible while maintaining a constant dilution ratio without a change in the amount of dilution air input for the purpose.

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

The above object, according to the present invention, the exhaust gas is introduced from the outside, the head portion is formed with a through hole; an ejector unit coupled to the front end of the head unit, guiding the primary dilution air to be introduced and moving, and having a first discharge hole connected to the through hole; It is inserted into the first discharge hole through the through hole, and the primary dilution air moves through the first discharge hole, and the exhaust gas introduced into the head unit due to a pressure drop at the front end of the ejector unit is discharged through the second discharge hole. a nozzle unit for guiding the ejector to be ejected in front of the ejector unit; a dilution unit coupled to the front end of the ejector unit and supplying secondary dilution air to the primary dilution gas discharged by mixing the exhaust gas and the primary dilution air to generate secondary dilution gas; and a stagnant air forming part which is formed at the rear end of the head part, forms stagnant air by decelerating the flow rate of the inflowing exhaust gas, and introduces the stagnant air into the head part.

Here, the stagnant air forming unit may include a diffuser in which an inlet hole through which the exhaust gas is introduced is formed and a radius gradually increases along a direction in which the exhaust gas flows.

Herein, the stagnant air forming unit includes: an air retention unit having an outlet hole through which exhaust gas decelerated through the diffuser unit stays and discharges the exhaust gas along a flow direction; and a sampling outlet extending in a direction perpendicular to the air retention part to discharge the exhaust gas toward the head part.

Here, it may further include a preheating unit formed between the stagnant air forming unit and the head unit to preheat the exhaust gas.

Here, the preheating unit preheats the exhaust gas to a temperature of 190°C to 210°C, and the primary dilution air is supplied at a temperature of 150°C to 250°C so that the primary dilution gas is generated by a high-temperature dilution method, The secondary dilution air may be supplied at a temperature of 10° C. to 30° C. so that the secondary dilution gas is generated by the room temperature dilution method.

Here, it is provided in front of the head part, and may further include a separation unit for cyclone separation of a target particle group having a size less than or equal to a preset size from the exhaust gas flowing from the outside.

According to the exhaust gas dilution apparatus of the present invention as described above, effective decompression can be achieved in the diffusion part by the primary dilution air moving at high speed through the first discharge hole, and thereby the exhaust gas moves smoothly through the nozzle part It has the advantage that compressed air is unnecessary for moving the exhaust gas.

In addition, since the secondary dilution air flows in the central direction of the first flow passage through the through hole formed in the first flow passage, the number of particles of exhaust gas adhering to the inner circumferential surface of the first flow passage may be reduced.

In addition, when the secondary dilution air is introduced into the first passage through the through hole, the exhaust gas particles adhering to the inner peripheral surface of the first passage may come off. Accordingly, the occurrence of particle loss in the process in which the exhaust gas becomes the secondary dilution gas can be effectively improved.

In addition, since the exhaust gas is primarily diluted in the ejector unit and secondarily diluted in the dilution unit, the dilution rate may be increased.

In addition, after the exhaust gas is preheated in the preheating unit, it is mixed with high-temperature primary dilution air and diluted at high temperature, and then mixed with room-temperature secondary dilution air and diluted at room temperature to prevent moisture in the exhaust gas from forming into droplets. and, through this, the measurement accuracy of the particles may be improved.

In addition, a cleaning fluid supply unit is provided between the head unit and the preheating unit, and the washing fluid is simultaneously supplied to the head unit and the preheating unit, so that the inside of the exhaust gas dilution device can be effectively cleaned. In particular, the cleaning fluid supply unit is connected to the rear end of the exhaust gas dilution device to ensure a sufficient distance between the supplied cleaning fluid and the measurement unit. Problems that may arise can be prevented.

In addition, since a separation unit is provided at the rear end to separate a specific target particle group from the exhaust gas by cyclone and move it, the measurement unit can calculate particle information for the target particle group.

In addition, the stagnant air forming part for introducing the exhaust gas at a constant speed by decelerating the flow rate of the exhaust gas is formed at the rear end, so that constant velocity suction is possible in a situation where the flow velocity of the exhaust gas is variable, thereby improving measurement accuracy.

1 is a perspective view showing an exhaust gas dilution device according to an embodiment of the present invention.
2 is a cross-sectional view of an exhaust gas dilution device according to an embodiment of the present invention.
3 is an exploded cross-sectional view showing the nozzle part of the exhaust gas dilution device according to an embodiment of the present invention.
4 is a perspective view illustrating a nozzle unit of an exhaust gas dilution device according to an embodiment of the present invention.
5 is a graph for explaining the effect according to the dilution temperature in the exhaust gas dilution device according to an embodiment of the present invention.
6 is an exemplary view illustrating the cleaning fluid supply unit of FIG. 1 .
FIG. 7 is a configuration diagram illustrating the measurement unit of FIG. 1 .
8 is an exemplary view showing an operation example of the separation unit.
9 is an exemplary view of the stagnant air forming unit of FIG. 1 .
10 shows the experimental results of the deceleration results according to the speed of the exhaust gas flowing into the stagnant air forming unit.

The specific details of the embodiments are included in the detailed description and drawings.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining an exhaust gas dilution device according to embodiments of the present invention.

1 is a perspective view showing an exhaust gas dilution apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of an exhaust gas dilution apparatus according to an embodiment of the present invention, and FIG. 3 is an exhaust gas dilution apparatus according to an embodiment of the present invention It is an exploded cross-sectional view showing the nozzle part of the exhaust gas dilution device as a center, and FIG. 4 is a perspective view showing the nozzle part of the exhaust gas dilution device according to an embodiment of the present invention. The exhaust gas dilution apparatus according to an embodiment of the present invention may include a head unit 100 , an ejector unit 200 , a nozzle unit 300 , a dilution unit 400 , and a stagnant air forming unit 1000 . In addition, it may further include a cleaning fluid supply unit 700 , a preheating unit 600 , or a separation unit 900 .

In the following description, for convenience of explanation, the front end/front end/front and the rear end/rear end/rear are described based on the flow direction of the exhaust gas. That is, when the exhaust gas is moved from the first point to the second point, the first point will be described as the rear end/rear end/rear, and the second point will be described as the front end/front end/front.

The head part 100 may include a space part 111 through which the exhaust gas 1 is introduced, and a through hole 112 connected to the space part 111 and penetratingly formed in the central axis direction at the front end thereof. In addition, the step protrusion 120 may be formed on the outer peripheral surface of the front end of the head part 100 in the circumferential direction. In addition, a cover (not shown) for sealing the space 111 may be provided at the rear end of the head part 100 , and exhaust gas may be introduced into the space part 111 through the cover.

In the present invention, exhaust gas may be an example of a measurement target, and the measurement target is not necessarily limited to exhaust gas. For example, when the measurement target is smoke from a chimney, a flow path through which a portion of the smoke is absorbed may be provided in the chimney, and the smoke moving through the flow path may pass through the space portion 111 of the head unit 100 through the cover. ) can be supplied.

The ejector unit 200 may be coupled to the front end of the head unit 100 . A first stepped groove 230 may be formed at the rear end of the ejector unit 200 , and the stepped protrusion 120 of the head unit 100 may be inserted into the first stepped groove 230 . Through this, the head part 100 and the ejector part 200 may be coupled to have the same central axis.

The ejector unit 200 may have a first discharge hole 210 that is formed through the central axis to be connected to the through hole 112 of the head unit 100 . In this case, the first discharge hole 210 may be connected to the first inlet 220 through which the primary dilution air 2 is introduced.

The first discharge hole 210 may be dividedly formed from a rear end to a front end into a suction unit 211 , an accelerator unit 212 , and a diffusion unit 213 .

As shown in FIG. 3 , the suction unit 211 may be formed at the rear end of the ejector unit 200 , and may be formed to have a smaller inner diameter toward the front. The acceleration unit 212 is formed at the front end of the suction unit 211 to be connected to the suction unit 211 and may have the same inner diameter. The diffusion unit 213 is formed at the front end of the accelerator unit 212 and is connected to the accelerator unit 212 , and the diffusion unit 213 may be formed to have an inner diameter increasing toward the front.

In addition, a first inlet 220 may be formed in the ejector unit 200 . The first inlet 220 may be formed through the radial direction to be connected to the suction unit 211 . The first inlet 220 guides the primary dilution air 2 supplied from the outside to the suction unit 211 , and the primary dilution air 2 passes through the accelerator unit 212 and the diffusion unit 213 to the ejector. It may flow out to the front end of the unit 200 . A first pipe 221 guiding the inflow of the primary dilution air 2 from the outside may be coupled to the first inlet 220 .

The primary dilution air 2 may be high-temperature air, and may be supplied at a temperature of 150°C to 250°C.

The nozzle unit 300 is inserted into the first discharge hole 210 through the through hole 112 , and as the primary dilution air 2 moves through the first discharge hole 210 , it enters the space 111 . A second discharge hole 340 penetratingly formed in the central axis direction may be formed so that the introduced exhaust gas 1 is sucked in and discharged.

The nozzle part 300 may include a flange part 310 , a connection part 320 , and a nozzle tip part 330 .

The flange portion 310 may be coupled to the inner surface of the space portion 111 by protruding in the form of a flange in the radial direction. The flange part 310 may be detachably coupled to the head part 100 by a fastening member such as a bolt.

The connection part 320 may be connected to the flange part 310 to extend forward. The connection part 320 penetrates the through hole 112 of the head part 100 and extends forward of the head part 100 so that the front end may be located inside the suction part 211 . The connecting portion 320 may be formed to have a smaller diameter toward the front. A space may be formed between the outer peripheral surface of the connection part 320 and the suction part 211 to form a space into which the primary dilution air 2 is introduced.

The nozzle tip part 330 may be formed at the front end of the connection part 320 and inserted into the acceleration part 212 . The nozzle tip portion 330 may have an outer diameter smaller than the inner diameter of the acceleration portion 212 .

In addition, the nozzle unit 300 may have a second discharge hole 340 penetrating in the central axis direction. The second discharge hole 340 at a position corresponding to the connection part 320 may be formed to have a smaller inner diameter toward the front, and the second discharge hole 340 at a position corresponding to the nozzle tip 330 has the same inner diameter. can be formed.

In addition, since the outer diameter of the nozzle tip part 330 is smaller than the inner diameter of the acceleration part 212 , it may have a first discharge passage 331 which is a space between the outer diameter of the nozzle tip part 330 and the inner diameter of the acceleration part 212 . . Accordingly, the primary dilution air 2 introduced into the suction unit 211 through the first discharge passage 331 may be moved to the diffusion unit 213 .

As the primary dilution air 2 passes through the first discharge passage 331 having a small cross-sectional area, the flow rate increases. When the primary dilution air 2 is discharged to the diffusion unit 213 , the pressure decreases. Then, a pressure difference is generated between the diffusion part 213 and the space part 111 , and the exhaust gas of the space part 111 moves to the diffusion part 213 through the second discharge hole 340 .

The cross-sectional size of the first discharge passage 331 can be adjusted, and thus, the flow rate and pressure of the primary dilution air 2 can be controlled.

If the central axis of the nozzle tip part 330 does not coincide with the central axis of the acceleration part 212 , the cross-sectional area of the gap between the nozzle tip part 330 and the acceleration part 212 varies depending on the location and the primary passing here The flow rate of the dilution air 2 also varies, and effective decompression may not be achieved at the rear end of the diffusion unit 213 . Then, the movement of the exhaust gas through the second discharge hole 340 may not be performed stably.

However, in the present invention, the nozzle tip portion 330 may be located on the same central axis as the acceleration portion (212). Therefore, the flow rate of the primary dilution air 2 becomes the same at any position between the nozzle tip part 330 and the accelerator part 212 , and effective pressure reduction is achieved in the diffusion part 213 to close the second discharge hole 340 . Through the exhaust gas can be moved stably. Further, since the movement of the exhaust gas can be made smoothly due to the effective decompression performed in the diffusion unit 213 , there is an advantage that compressed air for moving the exhaust gas is unnecessary.

The exhaust gas dilution apparatus according to an embodiment of the present invention may further include a first adapter unit 500 and a second adapter unit 550 .

The first adapter unit 500 may be coupled to the front end of the ejector unit 200 .

As shown in FIG. 3 , the first adapter part 500 may have an extended diffusion part 501 penetrated in the axial direction. The extended diffusion part 501 may be formed to have an inner diameter that increases in the forward direction, and may be formed to be continuous with the diffusion part 213 of the ejector part 200 .

The first adapter unit 500 may have a second step groove 502 formed along the outer peripheral surface of the front end portion.

The second adapter unit 550 may be coupled to the front end of the first adapter unit 500 .

The second adapter unit 550 may have a flow path hole 551 penetrating in the axial direction, and the flow path hole 551 may be connected to the extended diffusion unit 501 of the first adapter unit 500 .

The primary dilution air 2 introduced through the first inlet 220 and the exhaust gas supplied through the second discharge hole 340 are mixed in the diffusion unit 213 to generate the primary dilution gas, The first dilution gas may be moved through the extended diffusion unit 501 and the flow path hole 551 .

The second adapter part 550 may have a third stepped groove 552 formed along the outer peripheral surface of the front end.

The dilution unit 400 is configured to connect the first flow path unit 410 through which the primary dilution gas flows through the first adapter unit 500 and the second adapter unit 550 and the supplied secondary dilution air 3 to 1 . It may be composed of a second flow path part 420 guiding to the first flow path part 410 to be mixed with the secondary dilution gas. In the dilution unit 400 , the primary dilution gas and the secondary dilution air 3 may be mixed to generate the secondary dilution gas.

Specifically, the dilution unit 400 may be coupled to the front end of the first adapter unit 500 and the second adapter unit 550 . The rear end of the first flow path part 410 may be coupled to the third stepped groove 552 of the second adapter part 550 . The first flow path part 410 may be formed to be continuous with the flow path hole 551 of the second adapter part 550 , and the primary dilution gas generated in the diffusion part 213 flows to the first flow path part 410 . can be moved

A plurality of through holes 411 may be formed through the first flow path portion 410 .

The second flow path part 420 may be formed to surround the first flow path part 410 at a predetermined distance from the outside of the first flow path part 410 . The rear end of the second flow passage 420 may be coupled to the second stepped groove 502 of the first adapter 500 .

A second inlet 440 through which the secondary dilution air 3 is introduced may be formed at the front end of the outer peripheral surface of the second flow passage 420 . A second pipe 441 for guiding the secondary dilution air 3 from the outside may be connected to the second inlet 440 .

In addition, the dilution part 400 may have a guide wall 430 formed therein. The guide wall 430 may be provided between the first flow path part 410 and the second flow path part 420 . Also, the rear end of the guide wall 430 may be spaced apart from the front end of the first adapter unit 500 . Through this, most of the space between the first flow path part 410 and the second flow path part 420 may be partitioned by the guide wall 430 , and the secondary dilution air introduced through the second inlet 440 . The flow length of (3) can be increased. That is, the secondary dilution air 3 introduced through the second inlet 440 is moved in the rear direction in the space between the second flow path 420 and the guide wall 430, and the guide wall 430 and It may move to the space between the first flow path part 410 and the guide wall 430 through the space between the first adapter parts 500 . Then, the secondary dilution air 3 moves to the inside of the first flow path part 410 through the through hole 411 formed in the first flow path part 410 and is mixed with the primary dilution gas to generate the secondary dilution gas. will do

Since the plurality of through-holes 411 are formed in the first flow path part 410 as a whole, the area of the outer peripheral surface of the first flow path part 410 is reduced. Accordingly, the number of particles adhering to the inner circumferential surface of the first flow path part 410 among the exhaust gas particles of the primary dilution gas may be reduced, thereby reducing exhaust gas particle loss.

Furthermore, when the secondary dilution air 3 is introduced into the center direction of the first flow path part 410 through the through hole 411 , the flow of particles toward the inner circumferential surface of the first flow path part 410 is prevented and the first Exhaust gas particles adhering to the inner circumferential surface of the flow passage 410 may come off. Accordingly, most of the particles in the exhaust gas moving in the first flow passage 410 may be mixed with the secondary dilution air 3, and particle loss occurs in the process in which the exhaust gas becomes the secondary dilution gas. can also be effectively reduced.

The exhaust gas dilution apparatus according to an embodiment of the present invention may include a diffusion tube portion 570 , a stopper portion 580 , and an exhaust pipe 590 .

The diffusion tube unit 570 may be coupled to the front end of the dilution unit 400 .

A coupling groove 572 is formed at the rear end of the diffusion tube portion 570 in the circumferential direction, so that the front end of the guide wall 430 is inserted and coupled thereto. In addition, the rear end of the diffusion tube portion 570 may be inserted into the inner side of the second flow passage portion 420 to be coupled.

The diffusion tube portion 570 may be formed with an additional diffusion portion 571 that is formed penetrating in the axial direction. The additional diffusion unit 571 may be formed to have an inner diameter that increases in the forward direction, and the secondary dilution gas generated in the dilution unit 400 may be moved to the additional diffusion unit 571 .

The stopper 580 may be coupled to the front end of the diffusion tube portion 570 to seal the front end of the diffusion tube portion 570 .

A plurality of discharge pipes 590 may be coupled to the stopper 580 . A connection hole 581 may be formed through the stopper 580 to be coupled to the discharge pipe 590 , and the secondary dilution gas of the additional diffusion unit 571 moves to the discharge pipe 590 through the connection hole 581 . can be A particle counter (not shown) may be connected to at least one of the discharge pipes 590 , and the secondary dilution gas may be moved to the particle counter through the discharge pipe 590 .

According to the present embodiment, the inflow exhaust gas (1) is mixed with the primary dilution air (2) in the ejector unit (200) to perform primary dilution, and in the dilution unit (400), secondary dilution air (3) By mixing with the secondary dilution is made, the dilution rate can be increased.

As described above, the primary dilution air 2 supplied to the ejector unit 200 may be high temperature air of 150°C to 250°C. Accordingly, the primary dilution gas generated through the ejector unit 200 may be generated by a high-temperature dilution method. In addition, the secondary dilution air 3 supplied to the dilution unit 400 may be air at room temperature, and may be supplied at a temperature of 10°C to 30°C. Accordingly, the secondary dilution gas generated by the dilution unit 400 may be generated by a room temperature dilution method.

5 is a graph for explaining the effect according to the dilution temperature in the exhaust gas dilution device according to an embodiment of the present invention.

Referring to FIG. 5 , the exhaust gas discharged from the nozzle unit 300 is in a high temperature state P0. If the primary dilution air mixed with the high temperature exhaust gas is room temperature air, that is, the high temperature When the exhaust gas is diluted at room temperature, all moisture in the exhaust gas may be converted into droplets. Accordingly, the primary dilution gas of the first state P1 generated in the diffusion unit 213 may include a large amount of droplets. In addition, when the primary dilution gas containing a large amount of droplets is mixed with the secondary dilution air at room temperature in the dilution unit 400 and generated as the secondary dilution gas of the second state P2, the secondary dilution gas contains a large amount of droplets will continue to be included. Since these droplets may be treated as particles during measurement by a particle counter (not shown), measurement accuracy may be deteriorated.

However, according to the present invention, the primary generated in the diffusion unit 213 by mixing the exhaust gas in the high-temperature state P0 with the high-temperature primary dilution air 2, that is, by diluting the high-temperature exhaust gas at a high temperature. The dilution gas may be in the third state P3, and moisture in the exhaust gas may be prevented from forming droplets. In addition, since the secondary dilution gas is mixed with the secondary dilution air 3 at room temperature in the dilution unit 400 to form the secondary dilution gas in the second state P2, the secondary dilution gas does not contain droplets or the content of the droplets is minimized. and, through this, the measurement accuracy of particles can be improved.

The preheating unit 600 may be provided at the rear end of the head unit 100 , and may pre-heat the exhaust gas 1 flowing into the head unit 100 . The preheating unit 600 may preheat the exhaust gas 1 to a temperature of 190°C to 210°C. When the exhaust gas 1 is preheated and moved to the ejector unit 200, it can be mixed with the above-described primary dilution air 2 and diluted at a high temperature more effectively.

6 is an exemplary view illustrating the cleaning fluid supply unit of FIG. 1 .

As shown in FIG. 6 , the cleaning fluid supply unit 700 may include a compression unit 710 , a drying unit 720 , a filter unit 730 , and a joint passage unit 740 .

The compression unit 710 may compress and spray the cleaning fluid PA. Room temperature air may be used as the cleaning fluid PA, but is not limited thereto.

The drying unit 720 may be provided at the front end of the compression unit 710 and may dry the cleaning fluid PA.

The filter unit 730 may be provided at the front end of the drying unit 720 , and may remove foreign substances included in the cleaning fluid PA. Accordingly, the cleaning fluid PA discharged from the filter unit 730 may be in a state not to contain moisture and foreign substances.

The joint passage part 740 may be provided between the head part 100 and the preheating part 600 . The joint passage part 740 guides a part of the cleaning fluid PA moving through the filter part 730 to the head part 100 and guides the rest of the cleaning fluid PA to the preheating part 600 . can To this end, the joint passage part 740 is formed to extend in the radial direction of the joint passage part 740 on the inside and is connected to the filter part 730 so that the cleaning fluid PA moving from the filter part 730 is introduced. The inflow passage 741, the first guide passage 742 connected to the inflow passage 741 and extending in the direction of the head 100, and the inflow passage 741 connected to the preheating unit 600 A second guide passage 743 extending in the direction may be formed. The first guide passage 742 and the second guide passage 743 may be formed to be symmetrical to each other with respect to the inflow passage 741 and may be formed to have the same diameter. The same flow rate of the washing fluid PA flowing into the inflow passage 741 may be supplied to the first guide passage 742 and the second guide passage 743 , respectively. The joint passage 740 is a splitter so that the cleaning fluid PA flowing into the inflow passage 741 is bisected and supplied to the first guide passage 742 and the second guide passage 743 at the same flow rate, respectively. 744 may be formed. The separator 744 may be formed to protrude at the center so as to face the inflow passage 741 at a point where it is divided into the first guide passage 742 and the second guide passage 743 to divide the inflow passage 741 in two.

The cleaning fluid PA moving to the first guide flow path 742 moves through the head part 100 , the ejector part 200 , the dilution part 400 , the diffusion tube part 570 , and the discharge pipe 590 . The inside of each part can be cleaned.

In addition, the cleaning fluid PA moving to the second guide passage 743 may wash the inside of the preheating unit 600 while moving through the preheating unit 600 .

FIG. 7 is a configuration diagram illustrating the measurement unit of FIG. 1 .

1, 2 and 7, the exhaust gas dilution device may include a measuring unit 800 that is coupled to the front end of the dilution unit 400 and measures particle information of the secondary dilution gas. have.

The measuring unit 800 may include an injector 810 , a light source 820 , a light receiving unit 830 , and a calculator 840 .

The secondary dilution gas may be moved to the injection unit 810 through a flow passage 591 connected to the discharge pipe 590 . Then, the injector 810 may sequentially inject the particles P included in the secondary dilution gas one by one.

The light source 820 may irradiate the light 821 in a direction crossing the injection path of the particles P injected from the injection unit 810 . When the light 821 crossing the injection path of the particle P collides with the particle P on the injection path, scattering may occur.

The light receiving unit 830 may be provided on one side of the injection path, and may receive the light 822 scattered by the particles P emitted from the injection unit 810 after being irradiated from the light source 820 . When the size of the particles P injected from the injection unit 810 is large, the scattered light 822 may increase, and, conversely, if the size of the particles P is small, the scattered light 822 may decrease.

The calculator 840 may calculate size information of particles included in the secondary dilution gas based on the light information generated by the light receiver 830 . The particle size information may be calculated for particles acquired during a preset measurement time.

The particle size information calculated by the calculator 840 may include, for example, the concentration of PM10 (Particulate Matter with a diameter less than 10 μm), which is usually referred to as fine dust with a particle size of 10 μm or less, or the particle size. It can be calculated as the concentration of PM2.5, which is usually referred to as ultrafine dust with a size of 2.5 μm or less.

The measuring unit 800 is not limited to the above-described configuration, and may be formed in other known configurations for measuring the concentration of particles.

As the cleaning fluid supply unit 700 is positioned at the front end of the exhaust gas dilution device, the distance between the supplied cleaning fluid and the measurement unit 800 becomes closer. Then, foreign substances inside the exhaust gas dilution device may be moved to the measurement unit 800 by the cleaning fluid, which may cause disturbance of the measurement unit 800 , thereby reducing measurement accuracy. However, in the present invention, the cleaning fluid supply unit 700 is connected to the relatively rear part of the exhaust gas dilution device to ensure a sufficient distance between the supplied cleaning fluid and the measurement unit 800, and through this, It is possible to prevent the above-mentioned problems from occurring.

8 is an exemplary view illustrating an operation example of the separation unit of FIG. 1 .

The exhaust gas dilution device of the present invention may further include a separation unit 900 . The separation unit 900 of FIG. 8 is not shown in FIG. 1 , but may be disposed, for example, at the rear end of the preheating unit 600 . The separation unit 900 may cyclone-separate a target particle group having a size smaller than a preset size from the exhaust gas 1 introduced from the outside and guide it to the preheating unit 600 . Accordingly, the measurement unit 800 may calculate particle information for the target particle group.

The separation unit 900 may include a cylindrical portion 910 , an inlet pipe 920 , a main body 930 , a dust collecting unit 940 , and an outlet pipe 950 .

The inlet pipe 920 may be provided in a tangential direction to the cylindrical portion 910 , and the exhaust gas 1 may be introduced into the inlet pipe 920 .

The main body 930 is connected to the cylindrical portion 910 and may be formed in a conical shape, the dust collecting portion 940 is provided at a pointed end of the main body 930 , and the outlet pipe 950 is the cylindrical portion 910 . It may be provided in the central axis direction of the main body 930 at the inner center.

The exhaust gas 1 is introduced from the inlet pipe 920 in the tangential direction of the cylindrical portion 910 and becomes a swirling flow along the inner wall surface to be spirally moved to the cylindrical portion 910 and the main body 930 . During this time, a group of particles other than the target particle group (a large and heavy particle group) in the first airflow C1 in the direction from the cylindrical part 910 to the dust collecting part 940 receives centrifugal force and is deposited on the inner surface of the body 930 . and may be collected in the dust collecting unit 940 by the flow force of the first air flow C1. On the other hand, at the pointed end of the main body 930, the airflow reverses its direction and becomes the second airflow C2 of the swirling flow in the opposite direction to the first airflow C1, and the target particle group in the second airflow C2. is moved to the outlet pipe 950 through the center of the first airflow C1 and may be discharged.

The outlet pipe 950 may be connected to the preheating unit 600 , and accordingly, the target particle group may be introduced into the preheating unit 600 . The separation unit 900 is not limited to the above-described configuration, and various types of cyclones may be used.

9 is an exemplary view of the stagnant air forming unit of FIG. 1 , and FIG. 10 shows the experimental results of deceleration according to the speed of the exhaust gas flowing into the stagnant air forming unit.

As shown, the stagnant air forming unit 1000 may be formed at the rear end of the head unit 100 , more precisely, at the rear end of the preheating unit 600 .

The stagnant air forming unit 1000 forms stagnant air by decelerating the exhaust gas 1 flowing in at various flow rates of several tens to hundreds of m/s to a speed of several m/s or less. The velocity of the exhaust gas 1 flowing into the exhaust gas dilution device is not constant and may be changed. In particular, the flow rate of exhaust gas in the chimney of an industrial site may be variably changed according to circumstances. The flow rate may vary depending on the speed of the exhaust gas 1 flowing into the exhaust gas dilution device. In order to keep the dilution ratio constant, it may be considered to control the amount of dilution air differently, but dilution corresponding to the speed It is not easy to supply the amount of air immediately. In particular, when the dilution air is supplied by dividing the primary dilution air (2) and the secondary dilution air (3) in a multi-stage method as in the present invention, the amount of supplied dilution air is controlled to maintain a constant dilution ratio. It may not be easier.

Accordingly, in the present invention, the dilution ratio can be kept constant by maintaining a constant amount of dilution air and also maintaining a constant speed (flow rate) of exhaust gas supplied to the exhaust gas dilution device.

The stagnant air forming unit 1000 rapidly decelerates the speed even if the speed of the incoming air is changed to form stagnant air so that a certain amount of air can be introduced through the head unit 100 regardless of the speed of the incoming air. let it be

The stagnant air forming unit 1000 may include a diffuser unit 1010 , an air retention unit 1020 , and a sampling outlet 1040 .

In the diffuser unit 1010 , an inlet hole 1015 through which exhaust gas is introduced is formed, and a radius of a flow path may be formed to gradually increase from the inlet hole 1015 in a direction in which the exhaust gas flows. Accordingly, the flow rate of the exhaust gas introduced through the inlet hole 1015 is remarkably reduced with a decrease in pressure. The magnitude of the deceleration through the diffuser unit 1010 depends on the length of the diffuser unit 1010 or the slope of the flow path. can be controlled differently.

The air retention unit 1020 is formed at the front end of the diffuser unit 1010 and is a space in which the exhaust gas decelerated by the diffuser unit 1010 resides. An outlet hole 1025 is formed in the front end surface of the air retention unit 1020 so that the exhaust gas, which is decelerated and stayed in the air sieve flow, may flow out along the flow direction. A sampling outlet 1040 extending in an orthogonal direction may be formed at an upper end of the air retention unit 1020 .

The sampling outlet 1040 may be formed vertically at one side of the air retention unit 1020 . As described above, the air decelerated by the diffuser unit 1010 and stagnated in the air retention unit 1020 flows out through the outlet hole 1025 , and a part of the exhaust gas remaining in the air retention unit 1020 is air-retained. It may be discharged at a constant speed through the sampling outlet 1040 extending vertically from the unit 1020 .

Therefore, in the present invention, it is possible to supply a certain amount of exhaust gas to the inside of the exhaust gas dilution device regardless of the speed of the exhaust gas introduced by the stagnant air forming unit 1000, so that a constant dilution ratio is maintained under various flow rate conditions. Particles can be sampled.

10 shows the results of testing the speed of the fluid discharged through the sampling outlet 1040 when the fluids having different speeds are supplied through the inlet hole 1015 to the stagnant air forming unit 1000 according to the present invention. , it can be confirmed that the fluid is discharged at a constant speed through the sampling outlet 1040 because the speed of the fluid is reduced regardless of the speed of the fluid introduced through the inlet hole 1015 .

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms within the scope of the appended claims. Without departing from the gist of the present invention claimed in the claims, it is considered to be within the scope of the claims of the present invention to the extent that various modifications can be made by anyone skilled in the art to which the invention pertains.

1: Exhaust gas 2: Primary dilution air
3: secondary dilution air 100: head part
111: space portion 112: through hole
120: step protrusion 200: ejector part
210: first discharge hole 211: suction unit
212: acceleration unit 213: diffusion unit
220: first inlet 221: first pipe
230: first step groove 300: nozzle unit
310: flange portion 320: connection portion
330: nozzle tip portion 331: first discharge passage
340: second discharge hole 400: dilution part
410: first euro section 411: through air
420: second flow passage 430: guide wall
440: 2nd inlet 441 Building 2
500: first adapter unit 501: extended diffusion unit
502: second step groove 550: second adapter part
551: euro hole 552: third step groove
570: diffusion tube unit 571: additional diffusion unit
572: coupling groove 580: stopper
581: connection hole 590: discharge pipe
591: flow passage 600: preheating unit
700: cleaning fluid supply unit 710: compression unit
720: drying unit 730: filter unit
740: joint passage 741 inflow passage
742: first guide passage 743: second guide passage
744: callus 800: measuring part
810: injection unit 820: light source
830: light receiving unit 840: output unit
900: separation part 910: cylindrical part
920: entrance tube 930: body
940: dust collection unit 950: exit pipe
1000: stagnant air forming unit 1010: diffuser unit
1015: inlet hole 1020: air retention unit
1025: outlet hole 1040: sampling outlet

Claims (6)

a head in which exhaust gas is introduced from the outside and a through hole is formed;
an ejector unit coupled to the front end of the head unit, guiding the primary dilution air to be introduced and moving, and having a first discharge hole connected to the through hole;
It is inserted into the first discharge hole through the through hole, and the primary dilution air moves through the first discharge hole, and the exhaust gas introduced into the head unit due to a pressure drop at the front end of the ejector unit is discharged through the second discharge hole. a nozzle unit for guiding the ejector to be ejected toward the front of the ejector unit;
a dilution unit coupled to the front end of the ejector unit and supplying secondary dilution air to the primary dilution gas that is discharged by mixing the exhaust gas and the primary dilution air to generate secondary dilution gas; and
Exhaust gas dilution including a stagnant air forming part formed at the rear end of the head part and reducing the flow rate of the exhaust gas flowing in the flow direction of the exhaust gas to form stagnant air and introducing the decelerated stagnant air into the head part Device. The method of claim 1,
The stagnant air forming unit
and a diffuser part having an inlet hole through which the exhaust gas is introduced and having a radius gradually increasing in a direction in which the exhaust gas flows. 3. The method of claim 2,
The stagnant air forming unit
an air retention part in which the exhaust gas decelerated through the diffuser part stays, and an outlet hole for discharging the exhaust gas along the flow direction is formed; and
The exhaust gas dilution apparatus further comprising a sampling outlet extending in a direction perpendicular to the air retention part and discharging the exhaust gas toward the head part. The method of claim 1,
The exhaust gas dilution device further comprising a preheating unit formed between the stagnant air forming unit and the head unit to preheat the exhaust gas. 5. The method of claim 4,
The preheating unit preheats the exhaust gas to a temperature of 190°C to 210°C, and
The primary dilution air is supplied at a temperature of 150° C. to 250° C. so that the primary dilution gas is generated by the high-temperature dilution method, and the secondary dilution air is 10° C. to 30° C. so that the second dilution gas is generated by the room temperature dilution method. Exhaust gas dilution device supplied at a temperature of ℃. The method of claim 1,
Exhaust gas dilution device provided in front of the head, further comprising a separation unit for cyclone separation of a target particle group having a size less than or equal to a preset size from the exhaust gas flowing from the outside.

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