JP5495181B2 - Exhaust gas treatment apparatus and exhaust gas treatment method - Google Patents

Description

  The present invention relates to an apparatus and a method for removing moisture contained in exhaust gas.

  The exhaust gas discharged from the combustion furnace is guided to the chimney via the flue. (In this specification, a horizontal or oblique exhaust gas passage is called a flue, and a substantially vertical exhaust gas passage is called a chimney.) Combustion furnaces discharge harmful substances such as nitrogen oxides and sulfur oxides. Therefore, it is necessary to remove dust in the exhaust gas in these paths. As a method for removing the dust, a wet exhaust gas treatment process in which exhaust gas is washed with water is widely used.

  The exhaust gas from which dust has been removed through the wet exhaust gas treatment process contains a large amount of moisture and is supersaturated. There is a problem that exhaust gas in a state of excessive moisture is cooled by outside air or the like while flowing through the flue or chimney, and is condensed on the inner wall of the flue or the inner wall of the chimney. In addition, when exhaust gas with excessive moisture is released into the atmosphere, it is cooled and exhibits a white smoke state, and in some cases, there is a problem that water droplets are scattered from the top of the chimney.

  2. Description of the Related Art Conventionally, as an apparatus for removing moisture in exhaust gas, there is an apparatus called an “eliminator” in which a large number of thin plates bent in a zigzag shape are arranged with a predetermined gap (Patent Document 1). By passing through a narrow gap where the exhaust gas is bent, moisture in the exhaust gas can be collected by an eliminator.

  However, if the eliminator described in Patent Document 1 is continuously used, solid matter such as scale begins to adhere to the eliminator surface. Furthermore, if the eliminator is used for many years, the solid matter that has adhered grows and blocks the flow path of the exhaust gas. Therefore, it is necessary to periodically stop the combustion furnace or provide a bypass flue in the eliminator section to stop the exhaust gas flow into the eliminator and periodically remove solid matters such as scale adhering to the eliminator surface.

  As another device for removing moisture in exhaust gas, there is a device provided with guide vanes inside a chimney (Patent Document 2). Due to the guide vanes, the exhaust gas turns into a swirling flow, spreads by centrifugal force, and collides with the chimney inner wall. At this time, moisture in the exhaust gas is condensed on the inner wall of the chimney. The condensed moisture is recovered through the drain. The guide vanes are arranged at a distance from the thin plate bent and formed in a zigzag shape described in Patent Document 1, and the problem that the adhering matter blocks the flow path of the exhaust gas has been solved to some extent.

JP 11-319480 A Japanese Examined Patent Publication No. 3-6412

  However, the angle of the blade of the guide vane inside the chimney described in Patent Document 2 is fixed. The blade angle is designed for optimum performance when processing a steady maximum exhaust gas quantity. However, when the combustion furnace is in the initial stage or the final stage, or when the production amount is small, the amount of exhaust gas is small because the combustion amount is small. When the amount of exhaust gas is small, the speed of the swirl flow becomes smaller than the design value, and the speed at which the exhaust gas collides with the chimney inner wall becomes small. Therefore, the moisture in the exhaust gas may not be sufficiently condensed on the chimney inner wall. On the other hand, if the flow rate of the exhaust gas is too high, the water once condensed on the inner wall of the chimney is blown up, passes through the chimney, and there is a possibility that the water collecting efficiency is lowered.

  For this reason, maintaining an appropriate exhaust gas flow rate and maintaining the differential pressure before and after the eliminator at an appropriate value is important in using the eliminator described in Patent Document 2, but the exhaust gas amount is kept constant. That is actually difficult.

  In addition, the guide blade described in Patent Document 2 also has a problem of adhesion of solid matter such as scale on the surface of the guide blade due to long-term use, although not as much as the eliminator described in Patent Document 1. The solid matter cannot be easily removed.

  The present invention was made to solve the above-described problems of the prior art, and even if the amount of exhaust gas discharged from the combustion furnace increases or decreases, the moisture collection efficiency may decrease. In addition, an object of the present invention is to provide an exhaust gas treatment apparatus and an exhaust gas treatment method that can be easily removed even if solid matter adheres to the surface of the guide blade.

(1) The exhaust gas treatment apparatus of the present invention is provided with a drain collecting part that condenses and collects moisture in the exhaust gas on the inner wall of a chimney or a part of the flue. Inside the chimney or the flue, a guide vane that is fixedly supported by a support shaft and imparts a turning force to the exhaust gas is provided. There are preferably a plurality of guide vanes. The rotation angle of the guide vanes can be changed by rotating the support shaft. By changing the rotation angle of the guide vanes, the area of the gap through which the exhaust gas passes can be changed to change the exhaust resistance, the flow rate of the exhaust gas, the differential pressure before and after the guide vanes, and the like. Since the exhaust gas is given a turning force when passing through the guide vanes, it travels while swirling after passing through the guide vanes. Thereby, centrifugal force is generated in the exhaust gas, and the exhaust gas collides with the inner wall of the drain collecting portion, where moisture is condensed. The support shaft of the guide vane is inclined in the direction in which exhaust gas enters. Thereby, the effect which makes the exhaust gas which flowed into the drain collection part direct to the inner wall of a drain collection part by a guide blade becomes still higher.
(2) The exhaust gas treatment apparatus of the present invention is provided with a drain collecting part that condenses and collects moisture in the exhaust gas on the inner wall of a chimney or a part of the flue. Inside the drain collecting part, a guide vane that is fixedly supported by a support shaft and imparts a turning force to the exhaust gas is provided. There are preferably a plurality of guide vanes. The rotation angle of the guide vanes can be changed by rotating the support shaft. The function of the guide vane is as described in (1). The support shaft of the guide vane is inclined in the direction in which exhaust gas enters. Thereby, the effect which makes the exhaust gas which flowed into the drain collection part direct to the inner wall of a drain collection part by a guide blade becomes still higher.
(3) In the exhaust gas treatment apparatus of the present invention, the diameter of the drain collecting part is larger than the diameter of the chimney or the flue. Since the diameter of the drain collecting part is larger than the diameter of the chimney or the flue, the exhaust gas does not directly collide with water droplets adhering to the inner wall of the drain collecting part. Therefore, the force with which the water droplets adhering to the inner wall of the drain collecting part are blown up is weak, and the probability that the water droplets are detached and move with the exhaust gas is low.
(4) In the exhaust gas treatment apparatus of the present invention, the support shaft of the guide blade can be rotated from the outside of the chimney, the flue, or the drain collecting part. Therefore, the rotation angle of the guide vanes can be changed from the outside while operating the exhaust gas treatment device.
(5) The exhaust gas treatment apparatus of the present invention has a cylindrical return portion having substantially the same diameter as the chimney or the flue at the start end portion and the end end portion inside the drain collecting portion. Moisture condensed on the inner wall of the drain collecting part is prevented from moving by the return part, and is therefore blown off by the exhaust gas and hardly flows out beyond the drain collecting part.
(6) The exhaust gas treatment apparatus of the present invention includes a drain water discharge port at the lower end of the drain collecting unit. The water condensed on the inner wall of the drain collecting part moves toward the drain water discharge port due to gravity, and is discharged to the outside from the drain water discharge port.
(7) In the exhaust gas treatment apparatus of the present invention, by adjusting the rotation angle of the guide vanes, a part of the end portions of the adjacent guide vanes overlap and contact each other. Therefore, the guide vanes can be rotated to cause the ends of adjacent guide vanes to collide with each other. When solid matter adheres to the guide vanes, the guide vanes can collide with each other, and the solid matter can be dropped by vibration during the collision.
(8) The exhaust gas treatment apparatus of the present invention has a stopper that contacts the guide blade. The stopper is fixed inside the chimney, flue or drain collecting part. The guide blade is rotated to collide with the stopper, and the solid matter attached to the guide blade can be dropped by the impact. When the stopper is provided, the guide blades can be cleaned one by one.
(9) The exhaust gas treatment apparatus of the present invention includes a return at the end of the surface of the guide vane on which the exhaust gas is applied. The exhaust gas that has flowed along the surface of the guide vane changes its direction by returning and intensively blows out toward the inner wall of the drain collecting portion. When the exhaust gas collides with the inner wall of the drain collecting portion with a strong momentum, moisture in the exhaust gas can be collected more efficiently.
(10) The exhaust gas treatment apparatus of the present invention includes an exhaust gas conduit at a portion of the guide vane where the return is interrupted. By providing the exhaust gas conduit, the exhaust gas ejected from the return break can be guided to the inner wall of the drain collecting part through the exhaust gas conduit. As a result, the exhaust gas ejected from the return break is directed to the inner wall of the drain collection part without interfering with the exhaust gas that rises in a vortex, and the moisture collection efficiency can be maintained at a higher level.
( 11 ) In the exhaust gas treatment apparatus of the present invention, the inclination angle of the guide vanes in the exhaust gas ingress direction is 10 ° on the basis of a state perpendicular to the chimney, the flue or the drain collecting part wall (when there is no inclination). ~ 30 °. If the inclination angle of the guide vanes is less than 10 °, it is difficult to obtain the effect of imparting a turning force to the exhaust gas due to the inclination of the guide vanes. If the inclination angle of the guide vane exceeds 30 °, the effect of imparting a turning force to the exhaust gas due to the inclination of the guide vane may be weakened.
( 12 ) The exhaust gas treatment apparatus of the present invention includes a conical exhaust gas rectifier in the vicinity of the central axis of the drain collecting part. The tip of the exhaust gas rectifier faces the inflow direction of the exhaust gas. The inflowing exhaust gas hits the tip of the exhaust gas rectifier and changes the direction toward the inner wall of the drain collecting part. Thereby, the force which directs exhaust gas to the inner wall direction of a drain collection part can be enlarged further.
( 13 ) In the exhaust gas treatment apparatus of the present invention, a plurality of combinations of guide blades are provided in series. By making the combination of guide blades multistage, the moisture collection rate in the exhaust gas can be made higher than in the case of one stage.
(14) When the combination of the guide blades is provided in a plurality of stages in series, the combination of the guide blades is arranged so that the phases are different from each other.
(15) In the exhaust gas treatment method of the present invention, in the exhaust gas treatment device described above, the rotation angle of the guide vanes is adjusted so that the moisture collection efficiency in the exhaust gas is increased. When the exhaust gas flow rate is smaller than the design value, the guide blade is rotated in the closing direction to narrow the opening, and the exhaust gas flow rate is increased to bring the flow rate that is too slow close to the design value. When the exhaust gas flow rate is higher than the design value, the guide blade is rotated in the opening direction to widen the opening, the exhaust gas flow rate is reduced, and the excessively high flow rate is brought close to the design value.
(16) In the exhaust gas treatment method of the present invention, the guide vanes are rotated so that the ends of the adjacent guide vanes collide with each other to remove solid matter adhering to the guide vanes. Since the guide vane can be rotated from the outside of the drain collecting part, this operation is easy. Further, it is not necessary to disassemble the exhaust gas treatment device during this operation. Moreover, when this removal method is executed, it is not necessary to stop the inflow of exhaust gas. Therefore, the solid matter adhering to the guide vanes can be removed while the combustion furnace is operated normally. Thereby, it is not necessary to spray the high-pressure washing water as in the prior art and remove the solid matter attached to the surface. There is no need to provide a bypass flue.
(17) In the exhaust gas treatment apparatus of the present invention, the guide vanes are rotated to collide with the stoppers, and the solid matter adhering to the guide vanes is removed. When the stopper is provided, the guide blades can be cleaned one by one.

  In actual operation of the combustion furnace, it is inevitable that the amount of combustion, and hence the amount of exhaust gas, will change significantly. Conventional exhaust gas treatment equipment can efficiently remove moisture when the amount of exhaust gas is the design value (= optimum value), but can efficiently remove moisture even if the amount of exhaust gas is less than or greater than the design value. I can't.

  In the exhaust gas treatment apparatus of the present invention, when the exhaust gas flow rate is less than the design value, the guide vanes are rotated in the closing direction, the opening is narrowed, the exhaust gas flow rate is increased, and the exhaust gas flow rate is brought close to the design value. When the exhaust gas flow rate is higher than the design value, the guide blade is rotated in the opening direction, the opening is widened, the exhaust gas flow rate is reduced, and the exhaust gas flow rate is brought close to the design value.

  In this way, the exhaust gas treatment apparatus of the present invention can efficiently remove moisture by adjusting the rotation angle of the guide vanes, whether the actual exhaust gas amount is smaller or larger than the design value.

  In the exhaust gas treatment method of the present invention, the guide vanes are rotated so that the ends of the adjacent guide vanes collide with each other, and solid matter attached to the guide vanes can be removed by the impact. Since the guide vanes can be rotated from the outside of the drain collecting part, it is not necessary to disassemble the exhaust gas treatment device during this operation. Therefore, according to the exhaust gas treatment method of the present invention, it is possible to remove the solid matter attached to the guide vanes while operating the combustion furnace as usual. Thereby, it is not necessary to clean the guide vanes by jetting high-pressure washing water, and it is not necessary to provide a bypass flue for cleaning.

Longitudinal sectional view of the exhaust gas treatment apparatus of the present invention Plan view of the exhaust gas treatment apparatus of the present invention Explanatory drawing of the guide blade used for this invention Explanatory drawing of the guide blade used for this invention Longitudinal sectional view of the exhaust gas treatment apparatus of the present invention Longitudinal sectional view of the exhaust gas treatment apparatus of the present invention Plan view of the exhaust gas treatment apparatus of the present invention Longitudinal sectional view of the exhaust gas treatment apparatus of the present invention Plan view of the exhaust gas treatment apparatus of the present invention

  In FIG. 1, the longitudinal cross-sectional view of the waste gas processing apparatus 10 of this invention is shown. FIG. 2 shows a plan view of the exhaust gas treatment apparatus 10 of the present invention. In the exhaust gas treatment apparatus 10 of the present invention, a drain collecting part 12 having an enlarged diameter is provided in a part of the chimney 11. Moreover, although not shown in figure, the waste gas processing apparatus 10 of this invention can be similarly attached to the flue extended diagonally or horizontally.

  A cylindrical return portion 13 having substantially the same diameter as the chimney 11 is provided inside the start end portion 12 a and the end end portion 12 b of the drain collecting portion 12. Further, a drain water discharge port 14 is provided below the drain collecting unit 12.

  A plurality of substantially fan-shaped or substantially triangular guide blades 15 are arranged inside the drain collecting portion 12. In FIGS. 1 and 2, eight guide blades 15 are provided in one stage, and these are arranged in two stages so that the phases are different from each other. The purpose of the guide vanes 15 is to give a turning force to the exhaust gas 18 and to make the passage area of the exhaust gas 18 passing through the gap between the guide vanes 15 variable. The shape of the guide vanes 15 is not particularly limited as long as this purpose can be achieved. However, since the chimney 11 or the flue is usually cylindrical, a fan shape or a triangle shape or a similar shape is suitable. .

  The guide blade 15 is fixed to the support shaft 16. The support shaft 16 of the guide vane 15 penetrates the outer wall of the drain collecting part 12 and is rotatably supported. The support shaft 16 of the guide vane 15 can be rotated by a rotating means 17 (for example, a manual handle) provided outside the drain collecting unit 12. The guide blade 15 rotates by the same angle as the support shaft 16. By appropriately adjusting the rotation angle of each guide blade 15, a set of propellers can be formed by the entire guide blade 15 in one stage, and a swirling force can be applied to the exhaust gas 19 passing through the guide blade 15.

  The exhaust gas 18 that has traveled substantially linearly (without vortexing) from below the chimney 11 to the drain collecting portion 12 is given a turning force by each guide blade 15. As a result, the exhaust gas 19 that has passed through the guide vanes 15 rises in the drain collecting section 12 while spirally swirling.

  At this time, due to centrifugal force, the exhaust gas 20 spreads outward and collides with the inner wall of the drain collecting portion 12. When the exhaust gas 20 collides with the inner wall of the drain collection unit 12, the moisture in the exhaust gas 20 is condensed on the inner wall of the drain collection unit 12 to form water droplets 21.

  The water droplets 21 adhering to the inner wall of the drain collecting part 12 are gradually lowered by gravity, gathered at the lower end of the drain collecting part 12, and finally discharged from the drain water discharge port 14 to the outside.

  The water droplets 21 adhering to the inner wall of the drain collecting part 12 are blown up somewhat by the exhaust gas 20, but since there is a return part 13, the water drops 21 are separated from the inner wall of the drain collecting part 12 and enter the chimney 11 and rise. That can be avoided. Since the diameter of the drain collecting part 12 is larger than the diameter of the chimney 11, the exhaust gas 18 does not directly hit the water droplets 21 attached to the inner wall of the drain collecting part 12. Therefore, the force by which the water droplet 21 attached to the inner wall of the drain collecting part 12 is blown up is weak.

  By changing the rotation angle of each guide blade 15, the area through which the exhaust gas 19 passing through the gap between the guide blades 15 can be changed, and the exhaust resistance and the differential pressure before and after the guide blade 15 can be changed.

  When the amount of the exhaust gas 18 entering the drain collecting unit 12 is small, the differential pressure before and after the guide vanes 15 becomes small. Then, the speed of the exhaust gas 19 is decreased, and the speed at which the exhaust gas 20 collides with the inner wall of the drain collecting unit 12 is also decreased. At this time, the amount of moisture condensed on the inner wall of the drain collecting portion 12 is reduced, and the moisture collecting efficiency is lowered.

  In the exhaust gas treatment apparatus 10 of the present invention, when the amount of the exhaust gas 18 is small, the guide blades 15 are adjusted in the direction in which they can lie down. By doing so, the area through which the exhaust gas 19 passes becomes narrow, and the differential pressure increases for a small amount of the exhaust gas 18. Then, the speed of the exhaust gas 19 is increased, and the speed at which the exhaust gas 20 collides with the inner wall of the drain collecting unit 12 is also increased (approaching an appropriate speed). Therefore, the amount of moisture condensed on the inner wall of the drain collecting portion 12 is increased, and the moisture collecting efficiency can be increased.

  When the amount of the exhaust gas 18 is large, the differential pressure before and after the guide blade 15 increases. Then, the speed of the exhaust gas 19 is increased, and the speed of collision with the inner wall of the drain collecting unit 12 is also increased. There is an appropriate speed at which the exhaust gas 20 collides with the inner wall of the drain collecting section 12, and if the collision speed is too high, the condensed water droplets 21 are blown off, and the moisture collecting efficiency is lowered.

  In the exhaust gas treatment apparatus 10 of the present invention, when the amount of the exhaust gas 18 is large, the guide blades 15 are adjusted to stand up. By doing so, the area through which the exhaust gas 19 passes becomes wider, and the differential pressure becomes smaller for a larger amount of the exhaust gas 19. Then, the speed of the exhaust gas 19 is decreased, and the speed at which the exhaust gas 20 collides with the inner wall of the drain collecting unit 12 is also decreased (approaching an appropriate speed). Therefore, the moisture condensed on the inner wall of the drain collecting part 12 is not blown away, and the moisture collecting efficiency can be kept high.

  As described above, the exhaust gas treatment apparatus 10 of the present invention can adjust the differential pressure before and after the guide blades 15 by adjusting the rotation angle of each guide blade 15 when the amount of the exhaust gas 19 is large or small. It can be kept almost constant. Thereby, the speed of the exhaust gas 20 colliding with the inner wall of the drain collection part 12 can be kept substantially constant, and the moisture collection efficiency can be constantly kept high.

  The exhaust gas treatment apparatus 10 of the present invention is not limited to the vertical chimney 11 as shown in FIG. 1 but can be provided in an oblique or horizontal flue (not shown). In this case, it is necessary to change the attachment position of the drain water discharge port 14, but there is no particular difference from the case where the drain water discharge port 14 is provided in the chimney 11.

  Further, as shown in FIG. 3, a radius-side return 15b and an arc-side return 15c can be provided at the end (two sides) of the surface 15a of the guide vane 15 on the side where the exhaust gas 18 strikes. In FIG. 3, the return 15c on the arc side has an arc shape, but the effect is almost the same even with a linear shape that is easy to manufacture. A gap 15d through which the exhaust gas 18 passes is provided between the return 15b on the radius side and the return 15c on the arc side.

  The exhaust gas 18 that has flowed along the surface 15a of the guide vane 15 on which the exhaust gas 18 hits changes its direction by the return 15b on the radial side and the return 15c on the arc side, and is intensively ejected from the gap 15d. It collides with the inner wall of the collection part 12 with stronger momentum than the case where there is no return 15b on the radius side and return 15c on the arc side. By providing the return 15b on the radius side and the return 15c on the arc side, moisture in the exhaust gas 18 can be efficiently collected even when the speed of the exhaust gas 18 is slow.

  As shown in FIG. 4, when the exhaust gas conduit 22 is provided in the gap 15 d, the exhaust gas ejected from the gap 15 d can be guided to the inner wall of the drain collecting unit 12 through the exhaust gas conduit 22. As a result, the exhaust gas ejected from the gap 15d is directed to the inner wall of the drain collecting portion 12 without being interfered with the exhaust gas 19 that rises in a vortex, and the moisture collection efficiency can be further maintained.

  In FIG. 1, the support shaft 16 of the guide vane 15 is vertically attached to the wall of the drain collecting portion 12. However, as shown in FIG. 5, the support shaft 16 of the guide vane 15 may be attached to be inclined such that the tip of the guide vane 15 is inclined in the direction in which the exhaust gas 18 enters. If it does so, the effect which the exhaust gas 18 goes to the inner wall of the drain collection part 12 with the guide blade 15 will become still higher. The inclination angle θ of the support shaft 16 at this time is suitably 10 ° to 30 ° on the basis of the state perpendicular to the wall of the drain collecting portion 12. When the inclination angle θ of the support shaft 16 of the guide vane 15 is less than 10 °, it is difficult to obtain an effect of imparting a turning force to the exhaust gas 18 due to the inclination of the guide vane 15. When the inclination angle θ of the support shaft 16 of the guide vane 15 exceeds 30 °, the effect of imparting a turning force to the exhaust gas due to the inclination of the guide vane 15 may be weakened.

  As shown in FIG. 6, the exhaust gas treatment device 10 of the present invention may include a conical exhaust gas rectifier 23 in the vicinity of the central axis of the drain collecting unit 12. The tip of the exhaust gas rectifier 23 faces the inflow direction of the exhaust gas 18. The exhaust gas 18 hits the tip of the exhaust gas rectifier 23 and changes its direction toward the inner wall of the drain collecting portion 12. Thereby, the force which the exhaust gas 20 goes to the inner wall direction of the drain collection part 12 can be enlarged further.

  When the exhaust gas treatment apparatus 10 of the present invention is used for a long time, solid matter such as scale adheres to the surface of the guide blade 15. When the deposit grows, the rotational speed of the exhaust gas 19 and the collision speed of the exhaust gas 20 with respect to the inner wall of the drain collecting portion 12 gradually deviate from the design values, and the moisture collection efficiency decreases.

  As shown in FIG. 7, in the exhaust gas treatment apparatus 10 of the present invention, when the guide vanes 15 are closed, the end portions of the adjacent guide vanes 15 overlap and come into contact with each other. In FIG. 7, of the eight guide blades 15, two guide blades 15e and 15f are closed, and their end portions are overlapped and contacted at an overlapping portion 15g (shaded portion). In this way, the guide vanes 15 are rotated so that the ends of the adjacent guide vanes 15 collide with each other at the overlapping portion 15g (shaded portion), and solid matter attached to the guide vanes 15 can be removed by the impact. The guide blade 15 can be easily rotated by the rotating means 17 from the outside of the drain collecting portion 12. According to this method, when removing the solid matter adhering to the guide vanes 15, it is not necessary to decompose the exhaust gas treatment device 10, and it is not necessary to stop the inflow of the exhaust gas 18. For this reason, it is possible to remove the solid matter adhering to the guide blade 15 while operating the combustion furnace as usual.

  Alternatively, as shown in FIGS. 8 and 9, the exhaust gas treatment apparatus 10 of the present invention may include a stopper 24 on each guide blade 15. The stopper 24 is fixed to the inner wall of the drain collecting portion 12 and hits the stopper 24 when the guide blade 15 is rotated. The guide blade 15 is rotated to collide with the stopper 24, and solid matter attached to the guide blade 15 can be removed by the impact. When the stopper 24 is provided, the guide blades 15 can be cleaned one by one.

  The chimney 11 having a diameter of 1400 mm was provided with a drain collecting part 12 (diameter of about 2000 mm). The number of guide vanes 15 was eight per stage, and two stages were provided by shifting the phase of the guide vanes 15. The shape of the guide vane 15 was a fan shape (vertical angle about 50 °) with the apex facing the center of the chimney 11.

  The rotation operation of the guide vane 15 was performed by the rotation means 17 (manual handle). The rotatable range of the guide vanes 15 was 30 °. The rotation means 17 is provided with a lock mechanism for fixing the rotation angle so that the guide blade 15 does not rotate carelessly and the angle does not change.

The example which removed the water | moisture content in the waste gas 18 using the waste gas processing apparatus 10 of this invention is shown. When the amount of the exhaust gas 18 was 100,000 normal m ³ / h, the water discharged to the outside from the drain water discharge port 14 was 70 liter / h. Further, when the amount of the exhaust gas 18 was 40,000 normal m ³ / h, the water discharged to the outside from the drain water discharge port 14 was 35 liters / h. In either case, the differential pressure around the two-stage guide vanes 15 was 30 mmAq to 50 mmAq.

  In the exhaust gas treatment apparatus 10 of the present invention, when the flow rate of the exhaust gas 18 is smaller than the design value, the guide blade 15 is rotated in the closing direction, the opening is narrowed, the flow rate of the exhaust gas 19 is increased, and the flow rate of the exhaust gas 19 is increased. To the design value. When the flow rate of the exhaust gas 18 is higher than the design value, the guide blade 15 is rotated in the opening direction, the opening is widened, the flow rate of the exhaust gas 19 is reduced, and the flow rate of the exhaust gas 19 is brought close to the design value.

  In this way, according to the exhaust gas treatment apparatus 10 of the present invention, the actual exhaust gas 18 is included in the exhaust gas 18 by adjusting the rotation angle of the guide vanes 15 even if the flow rate of the exhaust gas 18 is smaller or larger than the design value. Water can be removed efficiently.

  In the exhaust gas treatment method of the present invention, the guide vanes 15 are rotated so that the ends of the adjacent guide vanes 15 collide with each other, and the solid matter attached to the guide vanes 15 can be removed by the impact. Since the guide vanes 15 can be rotated from the outside of the drain collecting unit 12, it is not necessary to stop or disassemble the exhaust gas treatment device 10 during this operation. Therefore, according to the exhaust gas treatment method of the present invention, it is possible to remove the solid matter attached to the guide vanes 15 while operating the combustion furnace as usual.

DESCRIPTION OF SYMBOLS 10 Exhaust gas treatment apparatus 11 Chimney 12 Drain collection part 12a Start end part 12b End part 13 Return part 14 Drain water discharge port 15 Guide blade 15a Exhaust gas contact surface 15b Radial side return 15c Arc side return 15d Return gap 15e Guide blade 15f Guide vane 15g Guide vane overlapping portion 16 Support shaft 17 Rotating means 18 Exhaust gas 19 Exhaust gas 20 Exhaust gas 21 Water droplet 22 Exhaust gas conduit 23 Exhaust gas rectifier 24 Stopper

Claims (17)

A part of the chimney or flue is equipped with a drain collecting part that condenses and collects the moisture in the exhaust gas on its inner wall,
Inside the chimney or the flue, it is provided with guide vanes that are fixedly supported by a support shaft and give a turning force to the exhaust gas,
The rotation angle of the guide vane can be changed by rotating the support shaft ,
The exhaust gas treatment apparatus , wherein the support shaft is inclined in the inflow direction of the exhaust gas. A part of the chimney or flue is equipped with a drain collecting part that condenses and collects the moisture in the exhaust gas on its inner wall,
Inside the drain collecting part, provided with a guide vane that is fixedly supported by a support shaft and imparts a turning force to the exhaust gas,
The rotation angle of the guide vane can be changed by rotating the support shaft ,
The exhaust gas treatment apparatus , wherein the support shaft is inclined in the inflow direction of the exhaust gas.   The exhaust gas treatment apparatus according to claim 1 or 2, wherein a diameter of the drain collecting part is larger than a diameter of the chimney or the flue.   The exhaust gas treatment apparatus according to any one of claims 1 to 3, wherein the support shaft is rotatable from the outside of the chimney, the flue, or the drain collecting part.   5. The exhaust gas treatment apparatus according to claim 3, wherein a cylindrical return portion having substantially the same diameter as the chimney or the flue is provided at a start end portion and a termination portion inside the drain collecting portion.   The exhaust gas treatment apparatus according to any one of claims 1 to 5, wherein a drain water discharge port is provided at a lower end of the drain collecting part.   The exhaust gas treatment apparatus according to any one of claims 1 to 6, wherein a part of an end portion of the adjacent guide blade overlaps by adjusting a rotation angle of the guide blade.   The exhaust gas treatment apparatus according to any one of claims 1 to 7, further comprising a stopper fixed to the inside of the chimney, the flue, or the drain collecting portion that contacts the guide blade.   The exhaust gas treatment apparatus according to any one of claims 1 to 8, wherein a return is provided at an end of a surface of the guide blade on the exhaust gas contact side.   The exhaust gas treatment apparatus according to claim 9, wherein an exhaust gas conduit is provided at a portion of the guide blade where the return is interrupted. 11. The exhaust gas treatment apparatus according to claim 1, wherein an inclination angle of the support shaft is 10 ° to 30 ° with respect to a state perpendicular to the chimney, the flue, or the wall of the drain collecting unit. . The exhaust gas treatment apparatus according to any one of claims 1 to 11 , further comprising a conical exhaust gas rectifier in the vicinity of a central axis of the drain collecting part. The exhaust gas treatment apparatus according to any one of claims 1 to 12 , wherein the combination of the guide blades is provided in a plurality of stages in series. The exhaust gas treatment apparatus according to claim 13, wherein the combinations of the guide blades are arranged so that the phases are different from each other with respect to each stage.   The exhaust gas treatment apparatus according to any one of claims 1 to 14, wherein the rotation angle of the guide blade is adjusted so that moisture collection efficiency in the exhaust gas is increased.   The exhaust gas treatment apparatus according to any one of claims 1 to 14, wherein the guide vanes are rotated so that ends of the adjacent guide vanes collide with each other to remove solid matter attached to the guide vanes. Method.   The exhaust gas treatment apparatus according to any one of claims 1 to 14, wherein the guide vanes are rotated so as to collide with the stopper, and solid matter attached to the guide vanes is removed.

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