KR102662945B1 - Apparatus for diluting exhaust gas - Google Patents

Abstract

The present invention relates to an exhaust gas dilution device. The exhaust gas dilution device according to the present invention includes a first dilution unit in which exhaust gas flows in from the outside and supplies primary dilution air to generate primary dilution gas, the first dilution unit. An ejector unit formed at the front end of the unit and supplying secondary dilution air to move the primary dilution gas at the rear end to the front end due to a pressure difference and generating secondary dilution gas, and an ejector unit formed at the front end of the ejector unit and supplying secondary dilution gas to the secondary dilution gas. It is characterized by comprising a second dilution unit that supplies dilution air to generate a third dilution gas.

Description

Exhaust gas dilution device {APPARATUS FOR DILUTING EXHAUST GAS}

The present invention relates to an exhaust gas dilution device. More specifically, in order to measure the concentration of particles contained in exhaust gas, high-concentration exhaust gas is diluted to fit the measurement range of a particle counter to improve measurement accuracy even for high-concentration exhaust gas. It is about an exhaust gas dilution device that can increase emissions.

In cases where the concentration of sampled particles exceeds the measurement range of the particle counter, a particle dilution device is installed at the front of the particle counter to dilute the sampled particles at a certain dilution ratio and then transfer them to the particle counter, measuring even high-concentration sampled particles. It is a device that allows you to do this.

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

In addition, in order to accurately measure the concentration of fine particles in industrial emission facilities such as chimneys, it is very important to satisfy the constant velocity suction condition that makes the flow of exhaust gas in the chimney and the particle sampling flow rate conditions the same. If the constant velocity suction condition is not met, more or less sampling is required, which distorts the measured particle concentration and causes a difference from the actual particle concentration inside the chimney.

Furthermore, the flow rate of exhaust gases in chimneys at industrial sites varies variably depending on the situation. The particle counter measures the particle concentration of the diluted dilution gas and converts the concentration of the particles to be measured based on this. As the flow rate of the exhaust gas flowing into the dilution device varies depending on the speed of the exhaust gas, the dilution ratio changes. If this changes, errors 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, complex conditions such as constant velocity suction must be possible while maintaining a constant dilution ratio and no moisture condensation must be satisfied.

Conventionally, exhaust gas dilution devices have measured the concentration of particles in a chimney by diluting particles by changing the amount of diluted air injected depending on the concentration of exhaust gas in the chimney. However, in order to achieve a high dilution ratio, the method of increasing the amount of diluted air according to concentration rapidly increases the amount of air injection required, so the capacity and size of the flow supply device for air injection must be increased. In general, the surrounding environment where measuring instruments are installed to measure chimney fine dust is high and the space is narrow, so if the measuring equipment becomes complicated and large, practical application becomes difficult. Therefore, a simple and compact configuration is required.

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

Therefore, the purpose of the present invention is to solve such conventional problems, and to supply dilution air not only to the front but also to the rear of the ejector, and to supply a small amount of dilution air using a small-capacity flow supply device to achieve high-magnification dilution. The purpose 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 problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

The above object is, according to the present invention, a first dilution unit that receives exhaust gas from the outside and supplies first dilution air to generate a first dilution gas; an ejector unit formed at the front of the first dilution unit and supplying secondary dilution air to move the primary dilution gas at the rear end to the front end due to a pressure difference and generating a second dilution gas; And it can be achieved by an exhaust gas dilution device including a second dilution unit formed in front of the ejector unit and supplying tertiary dilution air to the secondary dilution gas to generate tertiary dilution gas.

Here, the first dilution part is formed to surround a first flow path part through which the exhaust gas flows and a plurality of through holes are formed on the outer peripheral surface, and is spaced apart from the first flow part, and the first dilution air is supplied to the front end. It includes a second flow path to which a pipe is connected, and a guide wall disposed between the first flow path and the second flow path, and the primary dilution air flowing in through the pipe is connected to the second flow path and the second flow path. After moving backward through the space between the guide walls, it moves forward through the space between the first flow passage and the guide wall, and the first dilution gas flows into the first flow passage through the hole. It 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 passage, which is a passage through which the first dilution gas flows, and a dilution air supply passage, which is a passage for branching the incoming secondary dilution air and supplying it to a plurality of points in the suction passage, and the second dilution air is formed. The primary dilution gas of the first dilution unit may be introduced through the suction flow path due to a pressure difference due to the supply of , thereby generating the secondary dilution gas and discharging it forward.

Here, the dilution air supply passage includes a main passage through which the secondary dilution air flows from the outside; a first branch flow path branching from the main flow path to supply the secondary dilution air to a rear end of the suction flow path; And it may include a second branch flow path branching from the main flow path to supply the secondary dilution air to the front end of the suction flow path.

Here, the end of the first branch passage is formed to surround the rear end of the suction passage to discharge the secondary dilution air toward the front of the rear end of the suction passage, and the end of the second branch passage is formed to surround the rear end of the suction passage. It is formed to surround the front end of the suction flow path and can discharge the secondary dilution air toward the front end of the suction flow path.

Here, the suction flow path is formed at the rear end of the ejector part and includes a first suction part whose tube diameter gradually decreases toward the front, a first accelerator part formed at the front end of the first suction part and whose tube diameter is constant, and a front end of the first acceleration part. A second suction part is formed in which the secondary dilution air flowing in through the first branch flow path and the exhaust gas are mixed to produce a second-first dilution gas, and the pipe diameter is gradually reduced, and at the front end of the second suction part. A second accelerating unit is formed and has a constant pipe diameter, and is formed at the front end of the second accelerating unit. The secondary dilution air flowing in through the second branch passage is mixed with the 2nd-1st dilution gas to create 2nd-2nd dilution gas. It may include a diffusion section where the pipe diameter gradually increases.

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

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

Additionally, since diluted air is introduced toward the center of the first flow passage portion through the through hole formed in the first passage portion, the number of exhaust gas particles adhering to the inner peripheral surface of the first passage portion can be reduced.

Additionally, when diluted air flows into the inside of the first flow passage through the hole, exhaust gas particles adhering to the inner peripheral surface of the first flow passage may fall off. Accordingly, the loss of particles during the process of converting exhaust gas into 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 and diluted at high temperature, and then mixed with room temperature secondary and tertiary dilution air to dilute at room temperature, causing moisture in the exhaust gas to drop into droplets. This can be prevented, and through this, the measurement accuracy of particles can be improved.

In addition, by using a two-stage ejector, the dilution ratio can be maintained constant by inhaling a constant amount of exhaust gas even when the inlet pressure of the ejector part changes, thereby increasing the precision of particle measurement.

Figure 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 showing the ejector portion and the adapter portion of FIG. 1.
Figure 3 is a graph to explain the effect of 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.
Figure 5 is a perspective view showing an exhaust gas dilution device according to another embodiment of the present invention.

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

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art 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.

Figure 1 is a perspective view showing an exhaust gas dilution device according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view showing the ejector portion and adapter portion of Figure 1, and Figure 3 is an exhaust gas dilution device according to the present invention. This is a graph to explain the effect depending on the dilution temperature, and Figure 4 is a configuration diagram showing the measuring unit of Figure 1.

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

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

The first dilution part 100 may have a first flow path part 110, which is a flow path through which the exhaust gas 1 is sucked in, formed through the central axis direction.

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 part 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 has a first flow path part 110 through which the exhaust gas 1 flows, and a first flow path part 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 the inside. In the first dilution unit 100, the exhaust gas 1 and the 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 110 may be connected to the suction flow path 230 of the rear ejector part 200.

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

The second passage portion 120 may be formed on the outside of the first passage portion 110 to surround the first passage portion 110 at a certain distance apart.

A first inlet 140 through which the first diluted air 2 flows may be formed at the front end of the outer peripheral surface of the second flow path portion 120. A first pipe 141 that guides the first dilution air 2 from an external flow supply device may be connected to the first inlet 140.

Additionally, a guide wall 130 may be provided between the first flow path portion 110 and the second flow path portion 120. Additionally, the rear end of the guide wall 130 may be spaced apart from the rear end wall of the second flow path portion 120. That is, the first diluted air 2 flowing in through the first inlet 140 moves backward in the space between the second flow path portion 120 and the guide wall 130, and is connected to the guide wall 130 and the first diluted air 2. 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 passage portion 110 and the second passage portion 120 can be partitioned by the guide wall 130, and the primary dilution air flowing in through the first inlet 140 The flow length in (2) can be longer. Then, the primary dilution air (2) moves to the inside of the first flow path part (110) through the through hole (111) formed in the first flow path part (110) and is mixed with the exhaust gas (1) to form the first dilution gas. will be created.

Since a plurality of through holes 111 are formed throughout the first passage portion 110, the area of the outer peripheral surface of the first passage portion 110 is reduced. Accordingly, the number of exhaust gas 1 particles that adhere to the inner peripheral surface of the first flow path portion 110 can be reduced, and thus the exhaust gas 1 particle loss can be reduced.

Furthermore, when the primary dilution air (2) flows in toward the center of the first passage portion 110 through the through hole 111, it impedes the flow of particles toward the inner peripheral surface of the first passage portion 110 and The exhaust gas 1 particles adhering to the inner peripheral surface of the flow path portion 110 can be removed. 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 loss of particles can also be effectively reduced.

The ejector unit 200 is coupled to the front end of the first dilution unit 100 and supplies secondary dilution air 3 to generate secondary dilution gas. When the secondary dilution air 3 is supplied to the ejector unit 200, the primary dilution gas from the rear can be transferred to the front due to the pressure difference.

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

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

The space portion 231 is connected to the first flow path portion 110 of the first dilution portion 100, has a constant pipe diameter, and is an inlet portion 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 be formed to have an inner diameter that becomes smaller as it moves forward.

The first acceleration 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 be formed to have the same inner diameter. The end 212 of the first branch 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 speed of the secondary diluted air (3) increases as it passes through the end 212 of the first branch flow path with a small cross-sectional area. When the secondary diluted air (3) is discharged to the second suction part 234, the first acceleration occurs. The pressure at the outlet of unit 233 is lowered. Then, a pressure difference occurs between the second suction part 234 and the space part 231, and the first dilution gas in the space part 231 is supplied to the first suction part 232 and the first acceleration part 233. It may pass through and be sucked into the second suction part 234. Accordingly, in the second suction part 234, the secondary dilution air 3 branched through the first branch flow path 211 and the first dilution gas are mixed to generate the second and first dilution gases.

The second suction part 234 is formed at the front end of the first acceleration part 233, and may be formed to have an inner diameter that becomes smaller as it moves forward. As described above, at the rear end of the second suction unit 234, secondary dilution air (3) can be introduced through the first branch passage 211, and the pressure difference caused by the incoming secondary dilution air (3) creates a space. The primary dilution gas in 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 be formed to have the same inner diameter. The end 217 of the second branch flow path, which will be described later, is formed to surround the second accelerator 235, and the secondary dilution air branches forward toward the diffusion portion 236 at the front end of the second accelerator 235. 3) can be discharged. The flow speed of the secondary dilution air (3) increases as it passes through the end (217) of the second branch flow path with a small cross-sectional area. When the secondary dilution air (3) is discharged in front of the second accelerator (235), the pressure increases. It becomes lower. Then, a pressure difference occurs between the front of the second acceleration unit 235 and the second suction unit 234, and the 2nd-1st dilution gas of the second suction unit 234 is supplied to the second acceleration unit 235. It passes through and moves to the diffusion unit 236 in front of the second acceleration unit 235. Accordingly, in the diffusion unit 236, the 2nd-1st dilution gas and the branched 2nd dilution air 3 are mixed 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, 216) are generally formed through the radial direction and branch and supply the secondary dilution air (3) onto the suction passage (230).

A second pipe 221 that guides 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 diluted air supply passage may include a main passage 210, a first branch passage 211, and a second branch passage 216. The main flow path 210 is coupled with the second pipe 221 to introduce secondary dilution air 3 from the outside.

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

In this way, in the present invention, the ejector unit 200 is divided into two stages and the secondary dilution air (3) is discharged onto the suction passage 230 and the primary dilution gas located behind the ejector unit 200 is sucked. 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, the Q _E.1 branching with respect to Q _E.total , which has a constant flow rate flowing in through the main passage 210, The flow rate decreases and the flow rate of Q _E.2 increases relatively.

On the contrary, when the pressure of the Q _s portion at the rear of the ejector unit 200 decreases, the flow rate of Q _E.1 branching to Q _E.total , which has a constant flow rate flowing in through the main flow path 210, increases and is relatively The flow rate of Q _E.2 decreases.

In this way, even if the pressure at the rear end of the ejector unit 200 changes, the secondary diluted air flowing into the exhaust gas inflow passage 230 through the branched first branch passage 211 and the second branch passage 216 ( Since the flow rate of 3) is different, 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 is constant, so the dilution ratio can be maintained constant.

The 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, an extension diffusion part 501 may be formed to penetrate the first adapter part 500 in the axial direction. The extended diffusion portion 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 portion 236 of the ejector unit 200.

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

The second adapter unit 550 may be formed with a passage hole 551 penetrating in the axial direction, and the passage hole 551 may be connected to the extension diffusion portion 501 of the first adapter unit 500.

The secondary dilution air (3) flowing into the ejector unit 200 through the dilution air supply passages (210, 211, 216) and the primary dilution gas sucked through the suction passage (230) are mixed to form the secondary dilution gas. is generated, and the generated secondary dilution gas can be moved through the extension diffusion unit 501 and the flow path hole 551.

The second dilution unit 300 has a first flow path unit 310 through which the secondary dilution gas flows through the first adapter unit 500 and the second adapter unit 550, and a third dilution air supply (4). It may be composed of a second flow path unit 320 that guides the gas to the first flow path part 310 to be mixed with the secondary dilution gas. In the second dilution unit 300, the secondary dilution gas and the tertiary dilution air 4 may be mixed to generate tertiary dilution gas.

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

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

The second passage portion 320 may be formed on the outside of the first passage portion 310 to surround the first passage portion 310 at a certain distance apart. The rear end of the second flow path portion 320 may be coupled to the first adapter portion 500.

A second inlet 340 through which the tertiary dilution air 4 flows may be formed at the front end of the outer peripheral surface of the second flow path portion 320. A third pipe 341 that guides the third dilution air 4 from the outside may be connected to the second inlet 340.

In addition, the second dilution unit 300 may be formed with a guide wall 330. The guide wall 330 may be provided between the first flow path portion 310 and the second flow path portion 320. Additionally, the rear end of the guide wall 330 may be spaced apart from the front end of the first adapter unit 500. The tertiary diluted air (4) flowing in through the second inlet (340) moves backward in the space between the second flow path portion (320) and the guide wall (330), and flows through the guide wall (330) and the first It can be moved to the space between the first passage part 310 and the guide wall 330 through the space between the adapter parts 500. Through this, most of the space between the first passage portion 310 and the second passage portion 320 can be partitioned by the guide wall 330, and the third diluted air flowing in through the second inlet 340 The flow length in (4) can be longer. 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 second dilution gas to generate the 3rd dilution gas. I do it.

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

The exhaust gas dilution device according to an embodiment of the present invention may include a diffusion tube portion 570, a stopper portion 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 part 570 may have an additional diffusion part 571 formed through it 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 tertiary dilution gas generated in the second dilution unit 300 may be moved to the additional diffusion unit 571.

The stopper portion 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 allow the discharge pipe 590 to be coupled thereto, and the tertiary dilution gas of the additional diffusion unit 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 this embodiment, the incoming exhaust gas (1) is mixed with the primary dilution air (2) in the first dilution unit (100) to achieve primary dilution, and in the ejector unit (200) the secondary dilution air ( 3), a second dilution is achieved, and a third dilution is achieved by mixing with the third dilution air 4 in the second dilution unit 300, so that the dilution rate can be increased.

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. Accordingly, the first dilution gas generated through the first dilution unit 100 may be generated using a high-temperature dilution method. In addition, the secondary dilution air (3) and tertiary dilution air (4) supplied to the ejector unit 200 and the second dilution unit 300 may be air at room temperature and are supplied at a temperature of 10°C to 30°C. It can be. Accordingly, the secondary and tertiary dilution gases generated in the ejector unit 200 and the second dilution unit 300 may be generated by a room temperature dilution method.

Figure 3 is a graph to explain the effect of 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 at a high temperature (P0). If the first dilution air 2 mixed with the high temperature exhaust gas 1 is When air is at room temperature, that is, when the high temperature exhaust gas 1 is diluted to room temperature, all of the 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 first 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 dilution gas in the second state (P2), the second dilution gas is generated in the second state (P2). The diluted gas continues to contain a large amount of liquid droplets. Since these droplets may be treated as particles when measured by a particle counter (not shown), they may cause a decrease in measurement accuracy.

However, according to the present invention, the exhaust gas 1 at a high temperature (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, thereby forming the first dilution unit. The first dilution gas generated can be in the third state (P3), and moisture in the exhaust gas 1 can be prevented from forming into droplets. In addition, it is mixed with room temperature dilution air 3 in the ejector unit 200 and the second dilution unit 300 to form secondary and tertiary dilution gases in the second state (P2), so the dilution gas does not contain droplets. Alternatively, the content of droplets can be minimized, and through this, the measurement accuracy of particles can be improved.

A preheating unit, not shown, may be provided at the rear end of the first dilution unit 100 and may preheat the 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 moves to the first dilution unit 100, it is mixed with the above-described first dilution air 2 and can be diluted at a more effective high temperature.

As in the present invention, by providing the first dilution unit 100 in front of the ejector, the amount of dilution air can be minimized and a high ratio of dilution air can be generated.

In FIG. 1, the configuration of the first dilution unit 100 is omitted and a dilution device (case 1) consisting of only the ejector unit 200 and the second dilution unit 300 is installed at the rear of the ejector unit 200 as shown in FIG. In the case where the first dilution unit 100 is provided and the dilution device is composed of the first dilution unit 100, the ejector unit 200, and the second dilution unit 300 (case 2), the flow rate and dilution of the dilution air We will compare and explain the relationship between rain.

As shown in the table below, when the flow rate sampled from 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 for both case 1 and case 2. At this time, in case 1, since there is no first dilution unit 100, the flow rate of the exhaust gas 1 flowing into the ejector unit 200 must be 2.4 lpm. However, in case 2, the first dilution air (2) flows in from the first dilution unit (100) before flowing into the ejector unit (200), so, for example, the flow rate of the first dilution air (2) is set to 2.1 lpm. Then, the flow rate sampled from the chimney is required to be 0.3 lpm. At this time, in order to finally produce a dilution gas with a dilution ratio of 200, the flow rate of the third dilution air (4) supplied from the second dilution unit (300) is required to be 450 lpm in case 1 and 28 lpm in case 2.

Therefore, in 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 case 2, dilution gas of the same dilution ratio can be generated by injecting only 28 lpm. Therefore, compared to case 1, dilution gas at a high magnification can be generated in the second dilution unit 300 by using a low-capacity flow rate supply device. Of course, since the flow rate supplied to the first dilution unit 100 is small, dilution air can be supplied through a low-capacity flow 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 must be supplied at a high temperature, but in case 2 according to the present invention, the first dilution unit 100 Condensation of moisture can be prevented by supplying the primary dilution air (2) supplied to ) at high temperature. Because the amount of dilution gas flowing in 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 third dilution air (4) supplied to the second dilution unit (300) may be supplied through a blower.

In Figure 1, when there is no first dilution unit (case 1) Figure 1 (including first dilution part) (case 2) Flow rate sampled from the ejector section 2.4 Flow sampled from chimney 2.4 0.3 First dilution air (first dilution section) flow rate 0 2.1 Secondary dilution air (ejector part) flow rate 30 30 Third dilution air (second dilution section) flow rate 450 28 dilution ratio (0+30+450)/2.4=200 (2.1+30+28)/0.3=200.3

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

As shown in FIG. 4, the measurement unit 800 may include an injection unit 810, a light source 820, a light reception 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 can sequentially spray the particles P included in the third dilution gas one by one.

The light source 820 may radiate light 821 in a direction that intersects the injection path of the particles P ejected from the injection unit 810. Scattering may occur when light 821 that crosses the injection path of the particles (P) hits the particles (P) on the injection path.

The light receiving unit 830 is provided on one side of the injection path and can receive the light 822 scattered by the particles P emitted from the injection unit 810 after being irradiated from the light source 820. If the size of the particle P sprayed from the spray 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 calculation unit 840 may calculate size information of particles included in the secondary dilution gas based on the light information generated by the light receiving unit 830. Particle size information can be calculated for particles acquired 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㎛), which is commonly referred to as fine dust because the particle size is 10㎛ or less, or the concentration of particles. It can be calculated as the concentration of PM2.5, which is commonly referred to as ultrafine dust with a size of 2.5㎛ or less.

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

Figure 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 differs only in the configuration of the ejector unit 900 compared to the exhaust gas dilution device described with reference to FIGS. 1 to 4, and the remaining configurations are the same. That is, in this embodiment as well, the dilution air can be supplied in three stages: the first dilution unit 100, the ejector unit 900, and the second dilution unit 300. The following description will focus on the configuration of the ejector unit 900, which is different from the above-described embodiment.

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

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

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

The air injection unit 920 may be formed with a first discharge hole 925 penetrating in the central axis direction to be connected to the through hole 912 of the head unit 910. At this time, 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 portion 926 may be formed at the rear end of the air injection portion 920, and may be formed to have an inner diameter that becomes smaller as it moves forward. The acceleration unit 927 is formed at the front end of the suction unit 926 and is connected to the suction unit 926, and may be formed to have the same inner diameter. The diffusion portion 928 is formed at the front end of the acceleration portion 927 and is connected to the acceleration portion 927. The diffusion portion 928 may be formed to have an inner diameter that increases toward the front.

Additionally, a second inlet 922 may be formed in the air injection unit 920. The second inlet 922 may be formed through a radial direction and connected to the suction portion 926. The second inlet 922 guides the secondary diluted air 3 supplied from the outside to the suction unit 926, and the secondary diluted air 3 passes through the acceleration unit 927 and the diffusion unit 928 into the air. It may leak out to the front of the injection unit 920. A second pipe 921 that guides the inflow of 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 as the secondary dilution air 3 moves through the first discharge hole 925, it is inserted into the space 911. A second discharge hole 934 may be formed penetrating in the direction of the central axis so that the introduced primary dilution gas is sucked in and ejected.

The nozzle portion 930 may be composed of a flange portion 931, a connection portion 932, and a nozzle tip portion 933.

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

The connection portion 932 may be connected to the flange portion 931 and extend forward. The connection portion 932 extends forward of the head portion 910 through the through hole 912 of the head portion 910, so that the front end portion may be located inside the suction portion 926. The connection portion 932 may be formed to have a smaller diameter as it moves forward. A separation space may be formed between the outer peripheral surface of the connection portion 932 and the suction portion 926 to form a space into which the secondary dilution air 3 is introduced.

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

In addition, the nozzle unit 930 may be formed with a second discharge hole 934 penetrating in the central axis direction. The second discharge hole 934 at a position corresponding to the connection portion 932 may be formed to have an inner diameter that becomes smaller as it moves forward, and the second discharge hole 934 at a position corresponding to the nozzle tip portion 933 has the same inner diameter. can be formed.

In addition, since the outer diameter of the nozzle tip portion 933 is smaller than the inner diameter of the accelerating portion 927, it can have a first discharge passage 951 that is a space between the outer diameter of the nozzle tip portion 933 and the inner diameter of the accelerating portion 927. . Accordingly, the secondary diluted air 3 introduced into the suction unit 926 through the first discharge passage 951 can be moved to the diffusion unit 928.

The flow speed of the secondary diluted air (3) increases as it passes through the first discharge passage (951) with a small cross-sectional area, and when the secondary diluted air (3) is discharged to the diffusion unit (928), the pressure decreases. Then, a pressure difference occurs between the diffusion part 928 and the space part 911, and the first 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 portion 933 does not coincide with the central axis of the acceleration portion 927, the cross-sectional area of the gap between the nozzle tip portion 933 and the accelerating portion 927 varies depending on the location, and the secondary passing through it changes depending on the location. The flow rate of the dilution air (3) also changes, and effective pressure reduction may not be achieved at the rear end of the diffusion unit (928). Then, the movement of the first dilution gas through the second discharge hole 934 may not be stable.

However, in the present invention, the nozzle tip portion 933 may be located on the same central axis as the acceleration portion 927. Therefore, the flow rate of the secondary dilution air (3) becomes the same at any position between the nozzle tip part (933) and the acceleration part (927), and effective pressure reduction is achieved in the diffusion part (928), thereby opening the second discharge hole (934). Through this, the primary dilution gas can be moved stably. Additionally, the primary dilution gas can move smoothly due to the effective pressure reduction achieved in the diffusion unit 928.

This embodiment may also 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 air injection unit 920.

An extension diffusion part 501 may be formed through the first adapter part 500 in the axial direction. The extended diffusion portion 501 may be formed to have an inner diameter that increases toward the front, and may be formed to be continuous with the diffusion portion 928 of the air injection portion 920.

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

The second adapter unit 550 may be formed with a passage hole 551 penetrating in the axial direction, and the passage hole 551 may be connected to the extension and diffusion portion 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. It is considered to be within the scope of the claims of the present invention to the extent that anyone skilled in the art can make modifications without departing from the gist of the invention as claimed in the claims.

100: first dilution part 110: first euro part
111: Common 120: Second Euro Department
130: Guide wall 140: First inlet
141: Building 1 200: Ejector unit
210: Main Euro 211: First Quarter Euro
216: Second Quarter Euro 221: Part 2
230: suction passage 231: space part
232: first suction part 233: first acceleration part
234: second suction part 235: second acceleration part
236: diffusion section 300: second dilution section
310: First Euro Department 311: Common Gong
320: Second flow path 330: Guide wall
340: second inlet 500: first adapter part
501: Extension diffusion part 550: Second adapter part
551: Euro hole 570: Diffusion tube part
571: Additional diffusion part 580: Stopper part
581: Connection hole 590: Discharge pipe
591: flow path 800: measuring unit
810: injection unit 820: light source
830: light receiving unit 840: calculating unit
900: Ejector part 910: Head part
911: space 912: through hole
920: Air injection unit 921: Pipe 2
922: second inlet 925: first discharge hole
926: Suction unit 927: Acceleration unit
928: diffusion part 930: nozzle part
931: Flange portion 932: Connection portion
933: Nozzle tip portion 934: Second discharge hole
951: First discharge passage
1: exhaust gas
2: Primary dilution air
3: Secondary dilution air
4: Third dilution air

Claims (7)

A first dilution unit where exhaust gas flows in from the outside and supplies primary dilution air to generate primary dilution gas;
an ejector unit formed at the front of the first dilution unit and supplying a certain amount of secondary dilution air to move the primary dilution gas at the rear end to the front end due to a pressure difference and generating a second dilution gas; and
It includes a second dilution unit formed in front of the ejector unit and supplying tertiary dilution air to the secondary dilution gas to generate tertiary dilution gas,
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 the incoming secondary dilution air and supplying it 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. An exhaust gas dilution device that introduces the primary dilution gas of the first dilution unit through the suction passage to generate the secondary dilution gas and discharges it forward. According to paragraph 1,
The first dilution section
A first flow path through which the exhaust gas flows and a plurality of through holes formed on the outer circumferential surface, and a second flow path formed to surround and spaced apart from the first flow path and connected to a pipe through which primary dilution air is supplied to the front end. and a guide wall disposed between the first flow path part and the second flow path part, and the first dilution air introduced through the pipe passes through the space between the second flow path part and the guide wall. After moving backward, it moves forward through the space between the first flow passage part and the guide wall, and the first dilution gas flows into the first flow passage part through the hole and mixes with the exhaust gas. Exhaust gas dilution device. According to paragraph 1,
An exhaust gas dilution device in which the first dilution air is supplied at a temperature of 150°C to 250°C. delete According to claim 1,
The diluted air supply flow path is
a main flow path through which the secondary diluted air flows from the outside;
a first branch flow path branching from the main flow path to supply the secondary dilution air to a rear end of the suction flow path; and
An exhaust gas dilution device comprising 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 wherein the 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 flow path is formed at the rear end of the ejector unit and has a pipe diameter that gradually decreases toward the front. The secondary dilution air flowing in through the first branch flow path is mixed with the exhaust gas to produce a secondary-primary dilution gas, which is formed in a second suction part whose pipe diameter gradually decreases and at the front of the second suction part. A second accelerator having a constant pipe diameter is formed at the front end of the second accelerator, and the secondary dilution air flowing through the second branch flow path is mixed with the 2nd-1st dilution gas to produce a 2nd-2nd dilution gas. An exhaust gas dilution device that includes a diffusion section whose pipe diameter gradually increases.

Images