KR20230055580A - Apparatus for diluting exhaust gas - Google Patents

Abstract

The present invention relates to an apparatus for diluting exhaust gas, which enables high-ratio dilution by supplying a small amount of dilution air using a small-capacity flow supply device. The apparatus for diluting exhaust gas according to the present invention comprises a first dilution unit receiving exhaust gas introduced from the outside and supplying primary dilution air to produce primary diluted gas, an ejector unit formed at the front end of the first dilution unit and supplying secondary dilution air to move the primary diluted gas at the rear end to the front end by a pressure difference and produce secondary diluted gas, and a second dilution unit formed at the front end of the ejector unit and supplying tertiary dilution air to the secondary diluted gas to produce tertiary diluted gas.

Description

Exhaust gas dilution device {APPARATUS FOR DILUTING EXHAUST GAS}

The present invention relates to an exhaust gas dilution device, and more particularly, in order to measure the concentration of particles contained in exhaust gas, high concentration exhaust gas is diluted according to the measurement range of a particle counter, thereby improving measurement accuracy even for high concentration exhaust gas. It relates to an exhaust gas dilution device that can increase

When the concentration of the sampled particles exceeds the measurement range of the particle counter, the particle dilution device is installed in front of the particle counter to dilute the sampled particles at a certain dilution ratio and transfer 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 a high-temperature, high-moisture, high-concentration environment inside the chimney, droplet generation must be minimized and dilution must be performed. Furthermore, it is necessary to increase the accuracy of the measurement by maximally suppressing the occurrence of particle loss due to the structure of the dilution device.

In addition, in order to accurately measure the concentration of fine particles in an industrial discharge facility such as a chimney, it is very important to satisfy a constant velocity suction condition that makes the flow rate of the exhaust gas in the chimney equal to the particle sampling flow rate condition. 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 rate of the exhaust gas in the chimney of an industrial site is variably changed according to circumstances. The particle counter measures the particle concentration of the diluted dilution gas and converts the concentration of the particle to be measured based on this. If it is changed, an error may occur in the measured value of the particle concentration.

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

Conventionally, exhaust gas dilution devices have measured the concentration of particles in the chimney by diluting the particles by changing the injection amount of dilution air according to the concentration of the exhaust gas in the chimney. However, in the method of increasing the amount of dilution air according to the concentration to achieve a high dilution ratio, the required air injection amount rapidly increases, so the capacity and size of the flow rate supply device for air injection must be increased. In general, since the surrounding environment in which a measuring instrument is installed to measure chimney fine dust is high and the space is narrow, it becomes difficult to apply it in practice if the measuring facility becomes complicated and large. Therefore, a simple and compact configuration is required.

Republic of Korea Patent Publication No. 2013-0059592 (2013.06.07. Publication)

Accordingly, an object of the present invention is to solve such a conventional problem, and to supply dilution air to the rear as well as the front of the ejector, so that a small amount of dilution air is supplied using a small flow rate supply device to achieve high dilution. It is to provide an exhaust gas dilution device that makes it possible.

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

According to the present invention, the first dilution unit for generating the first dilution gas by supplying the first dilution air while the exhaust gas is introduced from the outside; an ejector unit formed at a front end of the first dilution unit and supplying secondary dilution air to move the primary dilution gas at the rear to the front stage by a pressure difference and generate secondary dilution gas; and a second dilution unit formed at a front end of the ejector unit and generating a tertiary dilution gas by supplying tertiary dilution air to the second dilution gas.

Here, the first dilution unit is formed to surround a first flow path portion through which the exhaust gas flows and a plurality of through holes are formed through the outer circumferential surface, and is spaced apart from the first flow path portion and supplied to the front end of the first dilution air It includes a second flow path portion to which a pipe is connected, and a guide wall disposed between the first flow path portion and the second flow passage portion, and the primary dilution air introduced through the pipe flows through the second flow path portion and the second flow passage portion. After moving backward through the space between the guide walls, move forward through the space between the first flow path and the guide wall, and the primary dilution gas flows into the first flow path through the through hole. and can be mixed with the exhaust gas.

Here, the primary dilution air may be supplied at a temperature of 150 °C to 250 °C.

Here, the ejector unit is formed with a suction flow path through which the first dilution gas flows and a dilution air supply flow path through which incoming secondary dilution air is branched and supplied to a plurality of points in the suction flow path. The first dilution gas of the first dilution part is introduced through the suction passage due to the pressure difference according to the supply of the second dilution gas, and the second dilution gas can be generated and discharged forward.

Here, the dilution air supply passage includes a main passage into which the secondary dilution air is introduced from the outside; a first branch passage branching from the main passage to supply the secondary dilution air to a rear end of the suction passage; and a second branch passage branching from the main passage to supply the secondary dilution air to a front end of the suction passage.

Here, the end of the first branch passage is formed to surround the rear end of the suction passage and discharges the secondary dilution air toward the front of the rear end of the suction passage, and the end of the second branch passage passes through the suction passage. It is formed so as to surround the front end of the suction flow passage toward the front end of the front end to discharge the secondary dilution air.

Here, the suction passage is formed at the rear end of the ejector unit and has a first suction part having a pipe diameter gradually decreasing toward the front, a first acceleration part formed at the front end of the first suction part and having a constant pipe diameter, and a front end of the first acceleration part. A second suction part formed in the second suction part, in which the secondary dilution air introduced through the first branch passage and the exhaust gas are mixed to generate the second-first dilution gas and the pipe diameter gradually decreases, and at the front end of the second suction part formed at the front end of the second accelerator and is formed at the front end of the second accelerator and the 2nd-1st dilution gas is mixed with the 2nd-1st dilution gas introduced through the 2nd branch passage to produce the 2nd-2nd dilution gas. It may include a diffusion part that is created and the tube diameter gradually increases.

According to the exhaust gas dilution device of the present invention as described above, there is an advantage in that high-magnification dilution air can be generated using a low-volume or low-pressure flow rate supply device.

Since the flow rate of the primary dilution air supplied at a high temperature is small, there is also an advantage in that less energy is consumed to heat the dilution air.

In addition, since dilution air is introduced toward the center of the first flow passage through the through hole formed in the first flow passage, the number of exhaust gas particles adhering to the inner circumferential surface of the first passage may be reduced.

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

In addition, after the exhaust gas is preheated in the preheating unit, it is mixed with high-temperature primary dilution air to be diluted at high temperature, and then mixed with room temperature secondary and tertiary dilution air to be diluted at room temperature, so that moisture in the exhaust gas is converted into droplets. This can be prevented, and through this, the measurement accuracy of the particles can be improved.

In addition, by using a two-stage ejector, it is possible to maintain a constant dilution ratio by inhaling a constant amount of exhaust gas even when the inlet pressure of the ejector unit changes, so that the precision of particle measurement can be improved.

1 is a perspective view showing an exhaust gas dilution device according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of an ejector unit and an adapter unit of FIG. 1 .
Figure 3 is a graph for explaining the effect of the dilution temperature in the exhaust gas dilution device according to the present invention.
Figure 4 is a configuration diagram showing the measuring unit of Figure 1;
5 is a perspective view showing an exhaust gas dilution device according to another embodiment of the present invention.

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 clear with reference to the detailed description of the following embodiments taken 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 make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Hereinafter, the present invention will be described with reference to 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 device according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of an ejector unit and an adapter unit of FIG. 1, and FIG. 3 is an exhaust gas dilution device according to the present invention. It is a graph for explaining the effect according to the dilution temperature, and FIG. 4 is a configuration diagram showing the measuring unit of FIG.

An exhaust gas dilution device according to an embodiment of the present invention may include a first dilution unit 100 , an ejector unit 200 and a second dilution unit 300 .

In the following description, for convenience of description, front end/front end/front and rear/rear end/rear are described based on the flow direction of 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/rear end/rear and the second point as the front/front/front.

In the first dilution unit 100, the first flow path unit 110, which is a channel through which the exhaust gas 1 is sucked and flows, may be formed through the central axis.

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 passage through which some of the smoke is absorbed may be provided in the chimney, and the smoke moving through the passage may be supplied to the first dilution unit 100 .

The first dilution unit 100 includes a first flow path unit 110 into which the exhaust gas 1 flows, and a first flow path unit 110 so that the supplied primary dilution air 2 is mixed with the exhaust gas 1 It may be composed of a second flow path portion 120 that guides to the inside. In the first dilution unit 100, exhaust gas 1 and primary dilution air 2 may be mixed to generate primary dilution gas. The primary dilution air 2 may be high-temperature air and may be supplied at a temperature of 150° C. to 250° C.

Specifically, the first dilution unit 100 may be coupled to the rear end of the ejector unit 200 . At this time, the first flow path unit 110 may be connected to the suction flow path 230 of the rear ejector unit 200 .

A plurality of through holes 111 may be formed through the first passage part 110 .

The second flow path part 120 may be formed to surround the first flow path part 110 at a predetermined distance from the outside of the first flow path part 110 .

A first inlet 140 through which the primary dilution air 2 flows may be formed at a front end of the outer circumferential surface of the second flow passage 120 . A first pipe 141 guiding the primary dilution air 2 from an external flow rate supply device may be connected to the first inlet 140 .

Also, a guide wall 130 may be provided between the first flow path portion 110 and the second flow path portion 120 . In addition, the rear end of the guide wall 130 may be spaced apart from the rear end wall of the second passage part 120 . That is, the primary dilution air 2 introduced through the first inlet 140 moves backward in the space between the second flow passage 120 and the guide wall 130, and the guide wall 130 and It can be moved to the space between the first flow path part 110 and the guide wall 130 through the space between the rear end walls of the second flow path part 120 . Through this, most of the space between the first flow path part 110 and the second flow path part 120 can be partitioned by the guide wall 130, and the primary dilution air introduced through the first inlet port 140 The flow length of (2) can be long. Then, the primary dilution air 2 moves to the inside of the first flow path unit 110 through the through hole 111 formed in the first flow path unit 110 and is mixed with the exhaust gas 1 to obtain the primary dilution gas. will create

Since the plurality of through holes 111 are formed as a whole in the first flow path portion 110, the area of the outer circumferential surface of the first flow path portion 110 is reduced. Therefore, the number of particles of the exhaust gas 1 sticking to the inner circumferential surface of the first passage portion 110 can be reduced, and thus the loss of the exhaust gas 1 particles can be reduced.

Furthermore, when the primary dilution air 2 is introduced toward the center of the first flow path unit 110 through the through hole 111, the flow of particles toward the inner circumferential surface of the first flow path unit 110 is hindered and the first dilution air 2 is introduced. Particles of the exhaust gas 1 adhering to the inner circumferential surface of the passage portion 110 can be released. Accordingly, most of the particles in the exhaust gas 1 moving in the first flow passage 110 can be mixed with the primary dilution air 2, and in the process of the exhaust gas 1 becoming the primary dilution gas. The occurrence of loss of particles can also be effectively reduced.

The ejector unit 200 is coupled to the front end of the first dilution unit 100 to supply secondary dilution air 3 to generate secondary dilution gas. When the secondary dilution air 3 is supplied to the ejector unit 200, the rear primary dilution gas can be transported forward due to a pressure difference.

A suction passage 230, which is a passage through which the primary dilution gas is sucked and flows, may be formed through the ejector unit 200 in the direction of the central axis. In addition, dilution air supply passages 210 , 211 , and 216 may be formed to supply secondary dilution air 3 for inducing uniform velocity suction of the exhaust gas 1 onto the suction passage 230 .

As shown in FIG. 2, the suction passage 230 includes a space part 231, a first suction part 232, a first acceleration part 233, a second suction part 234, and a second suction part 234 from the rear to the front. It may be divided into an acceleration unit 235 and a diffusion unit 236 .

The space part 231 is connected to the first passage part 110 of the first dilution part 100, has a constant pipe diameter, and is an inlet part through which the first dilution gas flows.

The first suction portion 232 may be formed at the front end of the space portion 231 and may have an inner diameter that becomes smaller toward the front.

The first accelerating part 233 is formed at the front end of the first suction part 232 and is connected to the first suction part 232, and may have the same inner diameter. The end 212 of the first branch flow passage, which will be described later, is formed to surround the first accelerator 233, and the secondary dilution air ( 3) can be discharged. The flow rate of the secondary dilution air 3 increases while passing through the end 212 of the first branch passage having a small cross-sectional area. When the secondary dilution air 3 is discharged to the second suction part 234, the first acceleration occurs. The pressure of the outlet of the unit 233 is lowered. Then, a pressure difference is generated between the second suction part 234 and the space part 231, and the primary dilution gas in the space part 231 is supplied to the first suction part 232 and the first accelerator part 233. It can be sucked into the second suction part 234 by passing through. Therefore, in the second suction unit 234, the secondary dilution air 3 branched through the first branch flow path 211 and the primary dilution gas are mixed to generate 2-1 primary dilution gas.

The second suction part 234 is formed at the front end of the first accelerating part 233 and may have an inner diameter that decreases toward the front. As described above, at the rear end of the second suction part 234, the secondary dilution air 3 can be introduced through the first branch passage 211, and the pressure difference caused by the inflow secondary dilution air 3 creates a space The primary dilution gas of the unit 231 may be sucked into the second suction unit 234 and mixed with the secondary dilution air 3 .

The second acceleration part 235 is formed at the front end of the second suction part 234 and is connected to the second suction part 234, and may have the same inner diameter. An end portion 217 of the second branch flow path described later is formed to surround the second accelerator part 235, and the secondary dilution air branched forward toward the diffusion part 236 at the front end of the second accelerator part 235 ( 3) can be discharged. The flow rate of the secondary dilution air 3 increases as it passes through the end 217 of the second branch passage having a small cross-sectional area. When the secondary dilution air 3 is discharged forward of the second accelerator 235, the pressure it gets lower Then, a pressure difference is generated between the front of the second acceleration unit 235 and the second suction unit 234, and the second-first dilution gas of the second suction unit 234 flows through the second acceleration unit 235. It passes through and moves to the diffusion part 236 in front of the second acceleration part 235. Therefore, in the diffusion unit 236, the 2nd-1st dilution gas is mixed with the 2nd-1st dilution gas and the 2nd-2nd dilution air 3 supplied by branching to generate the 2nd-2nd dilution gas.

As described above, dilution air supply passages 210 , 211 , and 216 may be formed in the ejector unit 200 . The dilution air supply passages 210, 211, and 216 are formed to penetrate in a radial direction, and branch and supply the secondary dilution air 3 onto the suction passage 230.

A second pipe 221 guiding the inflow of secondary dilution air 3 from the outside may be coupled to the dilution air supply passages 210 , 211 , and 216 .

In the present invention, the dilution air supply passage may include a main passage 210, a first branch passage 211, and a second branch passage 216. In the main flow path 210, the second pipe 221 is coupled to introduce the secondary dilution air 3 from the outside.

The first branch passage 211 and the second branch passage 216 branch from the main passage 210 to supply secondary dilution air 3 to the suction passage 230 . The end portion 212 of the branched first branch passage is formed to surround the first accelerator part 233, and the secondary dilution air 3 branched toward the second suction part 234 at the front end of the first accelerator part 233. ) to eject. In addition, the end portion 217 of the branched second branch flow path is formed to surround the second accelerator part 235, and the secondary dilution air 3 branched toward the diffusion part 236 at the front end of the second accelerator part 235. ) to eject.

As described above, in the present invention, the ejector unit 200 is branched into two stages so that the secondary dilution air 3 is discharged onto the suction passage 230 and sucks the primary dilution gas located at the rear of the ejector unit 200. there is a number

At this time, as shown in FIG. 2, when the pressure of the Q _s portion at the rear end of the ejector unit 200 increases, Q _E.1 branching with respect to Q _E. The flow rate decreases and the flow rate of Q _E.2 increases relatively.

Conversely, when the pressure of the Q _s portion at the rear end of the ejector unit 200 decreases, the flow rate of branching Q _E.1 increases relative to Q _E.total in which a constant flow rate flows through the main flow path 210 The flow rate of Q _E.2 will decrease.

As such, even if the pressure at the rear end of the ejector unit 200 is changed, the secondary dilution air flowing into the exhaust gas inflow passage 230 through the branched first branch passage 211 and the second branch passage 216 ( The flow rate of 3) is different, so the flow rate of Q _s to be sucked can be kept constant. Therefore, in the present invention, even if the pressure of the primary dilution gas at the rear end of the ejector unit 200 changes, the amount of Qs sucked in is constant, so the dilution ratio can be kept constant.

An exhaust gas dilution device 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. 2 , the extension diffusion part 501 may be formed through the first adapter part 500 in the axial direction. The extension and diffusion part 501 may have an inner diameter that increases as it goes forward, and may be formed continuously with the diffusion part 236 of the ejector unit 200 .

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 passage hole 551 formed therethrough in an axial direction, and the passage hole 551 may be connected to the extension/diffusion part 501 of the first adapter unit 500 .

The secondary dilution air 3 introduced into the ejector unit 200 through the dilution air supply passages 210, 211, and 216 and the primary dilution gas sucked through the suction passage 230 are mixed to form a secondary dilution gas. generated, and the generated secondary dilution gas may move through the extension diffusion part 501 and the passage hole 551.

The second dilution unit 300 includes a first flow path unit 310 into which the secondary dilution gas flows through the first adapter unit 500 and the second adapter unit 550, and the supplied tertiary dilution air 4 It may be composed of a second flow path portion 320 for guiding to the first flow path portion 310 to be mixed with the secondary dilution gas. In the second dilution unit 300 , the tertiary dilution gas may be generated by mixing the tertiary dilution gas and the tertiary dilution air 4 .

Specifically, the second dilution unit 300 may be coupled to front ends of the first adapter unit 500 and the second adapter unit 550 . The first flow path unit 310 may be formed to be continuous with the flow path hole 551 of the second adapter unit 550, and the secondary dilution gas generated by being mixed in the diffusion unit 236 is generated through the first flow path unit 310. ) can be moved.

A plurality of through holes 311 may be formed through the first passage part 310 .

The second flow path part 320 may be formed to surround the first flow path part 310 at a predetermined distance from the outside of the first flow path part 310 . The rear end of the second flow path part 320 may be coupled to the first adapter part 500 .

A second inlet 340 through which the tertiary dilution air 4 flows may be formed at a front end of the outer circumferential surface of the second flow passage 320 . A third pipe 341 guiding the tertiary dilution air 4 from the outside may be connected to the second inlet 340 .

Also, the guide wall 330 may be formed in the second dilution unit 300 . The guide wall 330 may be provided between the first flow path part 310 and the second flow path part 320 . Also, the rear end of the guide wall 330 may be spaced apart from the front end of the first adapter unit 500 . The tertiary dilution air 4 introduced through the second inlet 340 moves backward in the space between the second flow passage 320 and the guide wall 330, and the guide wall 330 and the first It can be moved to the space between the first flow path part 310 and the guide wall 330 through the space between the adapter parts 500 . Through this, most of the space between the first flow path part 310 and the second flow path part 320 can be partitioned by the guide wall 330, and the tertiary dilution air introduced through the second inlet 340 The flow length of (4) can be long. Then, the tertiary dilution air 4 moves to the inside of the first flow path 310 through the through hole 311 formed in the first flow path 310 and is mixed with the secondary dilution gas to generate a tertiary dilution gas. will do

The overall configuration of the second dilution unit 300 may be the same as that of the first dilution unit 100 described above.

An exhaust gas dilution device according to an embodiment of the present invention may include a diffusion tube part 570, a stopper part 580, and a discharge pipe 590.

The diffusion tube unit 570 may be coupled to the front end of the second dilution unit 300 .

The diffusion tube unit 570 may be formed with an additional diffusion unit 571 penetrating in the axial direction. The additional diffusion unit 571 may have an inner diameter that increases in a forward direction, and the tertiary dilution gas generated in the second dilution unit 300 may be moved to the additional diffusion unit 571 .

The stopper 580 may be coupled to the front end of the diffusion tube 570 to seal the front end of the diffusion tube 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 so that the discharge pipe 590 is coupled thereto, and the tertiary dilution gas of the additional diffusion part 571 moves to the discharge pipe 590 through the connection hole 581. It can be. A particle counter (not shown) may be connected to at least one of the discharge pipes 590, and the tertiary dilution gas may be moved to the particle counter through the discharge pipe 590.

According to the present embodiment, the inflowing exhaust gas 1 is mixed with the primary dilution air 2 in the first dilution unit 100 to perform primary dilution, and in the ejector unit 200, the secondary dilution air ( 3), the second dilution is performed, and the third dilution is performed by mixing with the tertiary dilution air 4 in the second dilution unit 300, thereby increasing the dilution rate.

As described above, the primary dilution air 2 supplied to the first dilution unit 100 may be high temperature air of 150°C to 250°C. Therefore, the first dilution gas generated through the first dilution unit 100 may be generated by a high-temperature dilution method. In addition, the secondary dilution air 3 and the tertiary dilution air 4 supplied to the ejector unit 200 and the second dilution unit 300 may be air at room temperature and supplied at a temperature of 10° C. to 30° C. It can be. Accordingly, the second and third dilution gases generated by the ejector unit 200 and the second dilution unit 300 may be generated by a room temperature dilution method.

Figure 3 is a graph for explaining the effect of the dilution temperature in the exhaust gas dilution device according to the present invention.

Referring to FIG. 3, the exhaust gas 1 flowing into the first dilution unit 100 is in a high temperature state P0, and if the primary dilution air 2 mixed with the high temperature exhaust gas 1 When is air at room temperature, that is, when the high-temperature exhaust gas 1 is diluted at room temperature, all moisture in the exhaust gas 1 may be converted into droplets. Accordingly, the primary dilution gas in the first state P1 generated in the first dilution unit 100 may include a large amount of liquid droplets. In addition, when the primary dilution gas containing a large amount of liquid droplets is mixed with dilution air at room temperature in the ejector unit 200 and the second dilution unit 300 to generate the dilution gas in the second state (P2), the secondary dilution gas is generated. A large amount of liquid droplets are continuously included in the diluent gas. Since these droplets can be treated as particles during measurement in a particle counter (not shown), they can cause a decrease in measurement accuracy.

However, according to the present invention, the exhaust gas 1 in the high-temperature state P0 is mixed with the high-temperature primary dilution air 2, that is, the high-temperature exhaust gas 1 is diluted at a high temperature in the first dilution unit. The primary dilution gas generated in may be in the third state (P3), and water in the exhaust gas 1 may be prevented from being converted into droplets. In addition, the ejector unit 200 and the second dilution unit 300 are mixed with the room temperature dilution air 3 to form secondary and tertiary dilution gases in the second state P2, so that the dilution gas does not contain droplets. Alternatively, the content of droplets may be minimized, and through this, measurement accuracy of particles may be improved.

A preheating unit (not shown) may be provided at a rear end of the first dilution unit 100 and may pre-heat exhaust gas 1 flowing into the first dilution unit 100 . The preheating unit 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 first dilution unit 100, it is mixed with the above-described primary dilution air 2 and can be diluted at a high temperature more effectively.

As in the present invention, since the first dilution unit 100 is provided in front of the ejector, it is possible to minimize the amount of dilution air and generate a high ratio of dilution air.

In FIG. 1, the configuration of the first dilution unit 100 is omitted, and the dilution device (case 1) composed of only the ejector unit 200 and the second dilution unit 300 and the rear of the ejector unit 200 as shown in FIG. Flow rate and dilution of dilution air in the case where the dilution device is provided with the first dilution unit 100 and is composed of the first dilution unit 100, the ejector unit 200, and the second dilution unit 300 (case 2) A comparative description of the relationship with respect to rain will be given.

As shown in the table below, when the flow rate sampled by the ejector unit 200 is fixed at 2.4 lpm, the required flow rate of the secondary dilution air 3 flowing into the ejector unit 200 is 30 lpm in both case 1 and case 2. At this time, since there is no first dilution unit 100 in Case 1, the flow rate of the exhaust gas 1 flowing into the ejector unit 200 should be 2.4 lpm. However, in case 2, since the primary dilution air 2 flows in from the first dilution unit 100 before flowing into the ejector unit 200, for example, the flow rate of the primary dilution air 2 is set to 2.1 lpm. 0.3 lpm is required for the flow rate sampled from the chimney. At this time, in order to finally generate a dilution gas having a dilution ratio of 200, the flow rate of the tertiary dilution air 4 supplied from the second dilution unit 300 is 450 lpm in case 1 and 28 lpm in case 2.

Therefore, in the case of case 1, the flow rate of the tertiary dilution air 4 supplied to the second dilution unit 300 in front of the ejector unit 200 to generate a dilution gas with a dilution ratio of 200 is 450 lpm, whereas in the present invention In the case of case 2, dilution gas of the same dilution ratio can be generated by introducing only 28 lpm. Therefore, compared to case 1, a high-magnification dilution gas can be generated by using a low-capacity flow rate supply device to the second dilution unit 300 . Of course, since the flow rate supplied to the first dilution unit 100 is small, the dilution air can be supplied through the low-capacity flow rate supply device.

In addition, for the high-temperature dilution described with reference to FIG. 3, in case 1, the secondary dilution air 3 supplied to the ejector unit 200 should be supplied at a high temperature, but in case 2 according to the present invention, the first dilution unit 100 ), it is possible to prevent condensation of moisture by supplying the primary dilution air (2) at a high temperature. Since the amount of dilution gas introduced at high temperature is smaller in case 2 compared to case 1, the amount of energy required to heat the dilution air can be minimized.

At this time, the primary dilution air 2 supplied to the first dilution unit 100 and the secondary dilution air 3 supplied to the ejector unit 200 are supplied using a compressor that generates high-pressure air, The tertiary dilution air 4 supplied to the second dilution unit 300 may be supplied through a blower.

When there is no first dilution part in FIG. 1 (case 1) Figure 1 (including the first dilution part) (case 2) Flow rate sampled from the ejector unit 2.4 Flow rate sampled from chimney 2.4 0.3 1st dilution air (1st dilution part) flow rate 0 2.1 2nd dilution air (ejector part) flow rate 30 30 3rd dilution air (2nd dilution part) flow rate 450 28 dilution ratio (0+30+450)/2.4=200 (2.1+30+28)/0.3=200.3

An exhaust gas dilution device according to an embodiment of the present invention may include a measurement unit 800 coupled to the front end of the second dilution unit 300 and measuring particle information of the tertiary dilution gas.

As shown in FIG. 4 , the measuring unit 800 may include a dispensing unit 810 , a light source 820 , a light receiving unit 830 and a calculation unit 840 .

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

The light source 820 may irradiate light 821 in a direction crossing the spray path of the particles P sprayed from the ejection unit 810 . Scattering may occur when the light 821 crossing the ejection path of the particle P collides with the particle P on the ejection path.

The light receiving unit 830 is provided on one side of the spraying path and may receive light 822 scattered by particles P sprayed from the spraying unit 810 after being irradiated by the light source 820 . If the size of the particles P ejected from the ejection unit 810 is large, the scattered light 822 may increase. Conversely, if the size of the particle 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 light information generated by the light receiver 830 . Particle size information may be calculated for particles obtained during a preset measurement time.

The particle size information calculated by the calculation unit 840 is, for example, the concentration of PM10 (Particulate Matter with a diameter less than 10 μm), which is commonly 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 measurement unit 800 is not limited to the above-described configuration, and may be formed with other known configurations for measuring the concentration of particles.

5 is a perspective view showing an exhaust gas dilution device according to another embodiment of the present invention.

The exhaust gas dilution device of FIG. 5 is different from the exhaust gas dilution device described with reference to FIGS. 1 to 4 except for the configuration of the ejector unit 900, and the rest of the configuration is the same. That is, in this embodiment, dilution air may be supplied in three parts to the first dilution unit 100, the ejector unit 900, and the second dilution unit 300. In the following description, the configuration of the ejector unit 900, which is different from the above-described embodiment, will be mainly described.

The ejector unit 900 according to the present embodiment may include a head unit 910, an air injection unit 920, and a nozzle unit 930.

The head part 910 includes a space part 911 into which the first dilution gas of the first dilution part 100 flows, and a through hole 912 connected to the space part 911 and formed at the front end in the central axis direction. can be formed.

The air injection unit 920 may be coupled to the front end of the head unit 910 . The head part 910 and the air injection part 920 may be coupled to have the same central axis.

The air injection unit 920 may have a first discharge hole 925 penetrating in the central axis direction so as to be connected to the through hole 912 of the head unit 910 . In this case, the first discharge hole 925 may be connected to the second inlet 922 through which the secondary dilution air 3 flows.

The first discharge hole 925 may be divided into a suction part 926, an acceleration part 927, and a diffusion part 928 from the rear end to the front end.

The suction part 926 may be formed at the rear end of the air injection part 920, and may have an inner diameter smaller toward the front. The acceleration part 927 is formed at the front end of the suction part 926 and is connected to the suction part 926, and may be formed with the same inner diameter. The diffusion part 928 is formed at the front end of the accelerating part 927 and is connected to the accelerating part 927, and the diffusion part 928 may be formed such that an inner diameter increases toward the front.

In addition, a second inlet 922 may be formed in the air injection unit 920 . The second inlet 922 may be formed to penetrate in the radial direction and be connected to the suction part 926 . The second inlet 922 guides the secondary dilution air 3 supplied from the outside to the suction unit 926, and the secondary dilution air 3 passes through the accelerator unit 927 and the diffusion unit 928 to It may flow out to the front end of the injection unit 920 . A second pipe 921 for guiding the inflow of the secondary dilution air 3 from the outside may be coupled to the second inlet 922 .

The secondary dilution air 3 may be room temperature air, and may be supplied at a temperature of 10 °C to 30 °C.

The nozzle unit 930 is inserted into the first discharge hole 925 through the through hole 912, and the secondary dilution air 3 moves through the first discharge hole 925 to the space portion 911. A second discharge hole 934 penetrating in a central axis direction may be formed so that the introduced primary dilution gas is sucked in and discharged.

The nozzle unit 930 may include a flange unit 931 , a connection unit 932 and a nozzle tip unit 933 .

The flange portion 931 may protrude in a radial direction in a flange shape and be coupled to an inner surface of the space portion 911 . The flange portion 931 may be detachably coupled to the head portion 910 by a fastening member such as a bolt.

The connecting portion 932 may be connected to the flange portion 931 and extend forward. The connecting portion 932 penetrates the through hole 912 of the head portion 910 and extends forward of the head portion 910 so that the front end portion may be positioned inside the suction portion 926 . The connecting portion 932 may be formed to have a smaller diameter in a forward direction. A separation space may be formed between the outer circumferential surface of the connection part 932 and the suction part 926 to form a space into which the secondary dilution air 3 is injected.

The nozzle tip part 933 may be formed at the front end of the connection part 932 and inserted into the accelerator part 927 . The nozzle tip 933 may have an outer diameter smaller than the inner diameter of the accelerator 927 .

In addition, the second discharge hole 934 penetrating the nozzle unit 930 in the direction of the central axis may be formed. The second discharge hole 934 at a position corresponding to the connecting portion 932 may have an inner diameter that decreases toward the front, and the second discharge hole 934 at a position corresponding to the nozzle tip 933 has the same inner diameter. can be formed

In addition, since the outer diameter of the nozzle tip 933 is smaller than the inner diameter of the accelerator 927, the first discharge passage 951 may be provided as a space between the outer diameter of the nozzle tip 933 and the inner diameter of the accelerator 927. . Accordingly, the secondary dilution air 3 introduced into the suction unit 926 through the first discharge passage 951 may be moved to the diffusion unit 928 .

The flow rate of the secondary dilution air 3 increases while passing through the first discharge passage 951 having a small cross-sectional area. When the secondary dilution air 3 is discharged to the diffusion part 928, the pressure decreases. Then, a pressure difference is generated between the diffusion part 928 and the space part 911, and the primary dilution gas in the space part 911 moves to the diffusion part 928 through the second discharge hole 934. do.

The cross-sectional size of the first discharge passage 951 can be adjusted, and through this, the flow rate and pressure of the secondary dilution air 3 can be controlled.

If the central axis of the nozzle tip part 933 does not match the central axis of the accelerator part 927, the cross-sectional area of the gap between the nozzle tip part 933 and the accelerator part 927 varies depending on the position, and the secondary The flow rate of the dilution air 3 also varies, and effective pressure reduction may not be achieved at the rear end of the diffusion unit 928. Then, the first dilution gas may not stably move through the second discharge hole 934 .

However, in the present invention, the nozzle tip 933 may be located on the same central axis as the accelerator 927 . Therefore, at any position between the nozzle tip part 933 and the accelerator part 927, the flow rate of the secondary dilution air 3 becomes the same, and effective pressure reduction is made in the diffusion part 928 to open the second discharge hole 934. Through this, the first dilution gas can be stably moved. In addition, the primary dilution gas can be smoothly moved due to effective pressure reduction in the diffusion unit 928 .

In this embodiment, a first adapter unit 500 and a second adapter unit 550 may be further included.

The first adapter unit 500 may be coupled to the front end of the air injection unit 920 .

The extension and diffusion part 501 may be formed through the first adapter part 500 in the axial direction. The extension and diffusion part 501 may have an inner diameter that increases in the forward direction, and may be formed continuously with the diffusion part 928 of the air injection part 920 .

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 passage hole 551 formed therethrough in an axial direction, and the passage hole 551 may be connected to the extension/diffusion part 501 of the first adapter unit 500 .

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. Anyone with ordinary knowledge in the art to which the invention pertains without departing from the subject matter of the invention claimed in the claims is considered to be within the scope of the claims of the present invention to various extents that can be modified.

100: first dilution unit 110: first flow path unit
111: through hole 120: second passage part
130: guide wall 140: first inlet
141: tube 1 200: ejector unit
210: Main Euro 211: First Quarter Euro
216: 2nd branch flow 221: 2nd pipe
230: suction flow path 231: space
232: first suction unit 233: first acceleration unit
234: second suction unit 235: second acceleration unit
236: diffusion unit 300: second dilution unit
310: first passage part 311: through hole
320: second passage part 330: guide wall
340: second inlet 500: first adapter unit
501: extension and diffusion unit 550: second adapter unit
551: Euro hole 570: Diffusion tube part
571: additional diffusion unit 580: stopper unit
581: connection hole 590: discharge pipe
591: flow path 800: measuring unit
810: injection unit 820: light source
830: light receiving unit 840: outputting unit
900: ejector unit 910: head unit
911: space part 912: through hole
920: air inlet 921: pipe 2
922: second inlet 925: first discharge hole
926: suction part 927: acceleration part
928: diffusion part 930: nozzle part
931: flange portion 932: connection portion
933: nozzle tip part 934: second discharge hole
951: first discharge passage
1: Exhaust gas
2: 1st dilution air
3: 2nd dilution air
4: 3rd dilution air

Claims (7)

a first dilution unit generating a first dilution gas by supplying a first dilution air to which exhaust gas is introduced from the outside;
an ejector unit formed at a front end of the first dilution unit and supplying secondary dilution air to move the primary dilution gas at the rear to the front stage by a pressure difference and generate secondary dilution gas; and
and a second dilution unit formed at a front end of the ejector unit and generating a tertiary dilution gas by supplying tertiary dilution air to the second dilution gas. According to claim 1,
The first dilution part
A first flow passage through which the exhaust gas flows and having a plurality of through holes formed through the outer circumferential surface, and a second flow passage formed to be spaced apart from and surrounding the first flow passage and connected to a pipe supplying primary dilution air to the front end. and a guide wall disposed between the first flow passage portion and the second flow passage portion, wherein the primary dilution air introduced through the pipe passes through a space between the second flow passage portion and the guide wall. After moving backward, move forward through a space between the first flow path portion and the guide wall, and through the through hole, the primary dilution gas flows into the first flow path portion and mixes with the exhaust gas. Exhaust gas dilution device. According to claim 1,
The exhaust gas dilution device in which the primary dilution air is supplied at a temperature of 150 ° C to 250 ° C. According to claim 1,
The ejector part
A suction flow path, which is a flow path through which the first dilution gas flows, and a dilution air supply flow path, which is a flow path for branching and supplying incoming secondary dilution air to a plurality of points in the suction flow path, are formed, and the pressure according to the supply of the second dilution air is formed. Differentially, the exhaust gas dilution device for generating the secondary dilution gas by introducing the first dilution gas of the first dilution unit through the suction passage and discharging it forward. According to claim 4,
The dilution air supply path is
a main flow path into which the secondary dilution air is introduced from the outside;
a first branch passage branching from the main passage to supply the secondary dilution air to a rear end of the suction passage; and
and a second branch flow path branching from the main flow path to supply the secondary dilution air to a front end of the suction flow path. According to claim 5,
The end of the first branch passage is formed to surround the rear end of the suction passage and discharges the secondary dilution air toward the front of the rear end of the suction passage;
An exhaust gas dilution device in which an end of the second branch passage is formed to surround the front end of the suction passage and discharges the secondary dilution air toward the front end of the suction passage. According to claim 5,
The suction passage is formed at the rear end of the ejector unit and formed at a first suction part having a pipe diameter gradually decreasing toward the front, a first acceleration part formed at a front end of the first suction part and having a constant pipe diameter, and a front end of the first acceleration part. The secondary dilution air introduced through the first branch flow path and the exhaust gas are mixed to generate the 2nd-1st dilution gas, and a second suction part having a gradually reduced pipe diameter is formed at the front end of the second suction part. A second accelerator having a constant pipe diameter, formed at the front end of the second accelerator, and mixing the secondary dilution air introduced through the second branch flow path with the secondary dilution gas to generate a secondary dilution gas; Exhaust gas dilution device including a diffusion part in which the tube diameter gradually increases.

Images