WO2013137463A1 - セパレーター - Google Patents
セパレーター Download PDFInfo
- Publication number
- WO2013137463A1 WO2013137463A1 PCT/JP2013/057533 JP2013057533W WO2013137463A1 WO 2013137463 A1 WO2013137463 A1 WO 2013137463A1 JP 2013057533 W JP2013057533 W JP 2013057533W WO 2013137463 A1 WO2013137463 A1 WO 2013137463A1
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- WO
- WIPO (PCT)
- Prior art keywords
- partition member
- dust
- housing
- gas
- separator
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the present invention relates to a separator that is disposed downstream of a wet dust collector that collects dust contained in exhaust gas and separates water droplets from the exhaust gas from the wet dust collector.
- wet dust collectors are used to remove dust from the exhaust gas from converters.
- the wet dust collector sprays water on the passing exhaust gas, and collects and removes dust in the exhaust gas with spray water.
- exhaust gas containing water droplets containing dust is discharged.
- a separator is disposed downstream of the wet dust collector.
- the separator has a cylindrical housing that has an inlet that opens upward and a gas outlet that opens in the horizontal direction and is bent by approximately 90 °.
- a partition member that divides the internal space is provided. Water droplets in the exhaust gas flowing into the separator adhere to the inner surface of the outer wall of the housing and the surface of the partition member, and flow along the surface. Water containing dust flowing along the inner surface of the outer wall (hereinafter referred to as dust-containing water) is discharged out of the housing from a water outlet provided on the outer wall.
- the dust-containing water flowing along the surface of the partition member is dammed by a dam portion formed at an end portion adjacent to the gas outlet in the partition member, and the outside of the housing is connected to the outside of the housing from both ends of the dam portion via drainage ports. Is discharged.
- the exhaust gas introduced into the separator is discharged from the separator through the gas outlet after the water droplets are removed.
- Patent Document 3 in a separation device (separator) in which a guide plate curved in the same manner as the elbow tube is provided in the elbow tube, the separation device is formed by connecting the diffuser portion of the venturi tube to the inlet of the elbow tube.
- a separation device is described in which the flow rate of the gas flowing into it is increased.
- the amount of liquid droplets that collide with the inner surface of the guide plate or the elbow tube is increased by increasing the gas flow rate.
- Patent Document 4 a plurality of collision plates inclined at an angle with respect to the gas flow direction are provided at the gas inlet of an elbow type separator to increase the particle size of water droplets contained in the gas.
- a separator that makes it easy to trap water droplets is described.
- the housing is formed to extend in the horizontal direction in the vicinity of the gas outlet, and the partition member in the housing is also the same as that of the gas outlet. In the vicinity, it is formed to extend in the horizontal direction. Accordingly, the dust-containing water that flows along the surface of the partition member tends to stay in the weir part because the flow velocity is reduced at the part extending in the horizontal direction. Therefore, in the dam portion, dust may be separated from the dust-containing water and accumulate. In particular, dust tends to accumulate in a portion of the weir portion that is separated from the drain port.
- Patent Document 4 there is a problem that dust tends to accumulate on the inclined member in addition to a high pressure loss at the inclined member arranged at the inlet of the separator.
- a cleaning nozzle is provided for cleaning dust accumulated on the inclined member with water, which increases the manufacturing cost and the operating cost. Furthermore, since the amount of water droplets in the gas increases while water is jetted from the cleaning nozzle to wash the inclined member, the amount of water droplets flowing out downstream through the separator is significantly increased.
- the present invention has a technical problem to solve such problems of the prior art, and prevents the retention of dust-containing water flowing along the surface of the partition member arranged inside the housing, and separates with a simple configuration.
- the object is to provide a separator with improved efficiency.
- a separator that is connected downstream of a wet dust collector that collects dust contained in exhaust gas and separates water droplets containing dust from the exhaust gas from the wet dust collector
- a gas inlet that opens upward and receives the exhaust gas from the wet dust collector
- a gas outlet that opens horizontally or below, and that changes the flow direction of the exhaust gas flowing from the gas inlet to the gas outlet.
- At least one partition member provided at an end portion of the partition member on the gas outlet side, and communicated with the dam portion through a drain port
- the dust-containing water that has been blocked by the dam provided with a drain pipe for discharging to the outside of the housing from the dam
- the partition member is provided with a deflector for directing the dust-containing water flowing along the surface of the partition member toward the drain port.
- the partition member may be arranged so as to divide the internal space of the housing vertically on the gas outlet side. Further, the drainage port may be formed in the drainage pipe so as to open at both end portions in the transverse direction with respect to the gas flow direction in the housing in the dam portion.
- the deflector may have a substantially triangular plate shape having a vertex on the upstream side in the gas flow direction and expanding from the vertex toward the downstream in the gas flow direction.
- the protrusion height H of the deflector from the partition member is preferably selected from the range of 0.5 ⁇ H0 ⁇ H ⁇ 1.0 ⁇ H0 with respect to the height H0 of the weir portion.
- a region adjacent to the weir portion in the gas flow direction in the housing may be formed to be inclined downward at an inclination angle ⁇ in a range of 5 ° ⁇ ⁇ ⁇ 25 ° toward the downstream. it can.
- the amount V of dust-containing water introduced into the housing and the inclination angle ⁇ can satisfy the following relationship.
- a separator that is connected downstream of a wet dust collector that collects dust contained in exhaust gas and separates water droplets containing dust from the exhaust gas from the wet dust collector, opens vertically upward.
- a gas inlet that receives the exhaust gas from the wet dust collector and a gas outlet that opens in the horizontal direction are formed, and a passage that changes the flow direction of the exhaust gas flowing from the gas inlet to the gas outlet from the vertically lower side to the horizontal direction is formed.
- the at least one partition member is disposed so as to divide the internal space of the housing vertically on the gas outlet side, and is an area adjacent to the weir portion in the gas flow direction in the housing in the partition member Is inclined downward with an inclination angle ⁇ toward the downstream, and the separator is characterized in that the inclination angle ⁇ is 5 ° ⁇ ⁇ ⁇ 25 °.
- the partition member may be provided with a deflector for directing the dust-containing water flowing along the surface of the partition member toward the drain port.
- FIG. 1 is a schematic view of a converter exhaust gas treatment facility equipped with a separator according to the present invention.
- 1 is a schematic cross-sectional view of a separator according to a first embodiment of the present invention. It is a schematic fragmentary sectional perspective view which fractures
- FIG. 5 is a cross-sectional view taken along line VV in FIG. 2. It is a graph which shows an experimental result. It is a graph which shows an experimental result. It is a schematic sectional drawing of the separator by the 2nd Embodiment of this invention. It is sectional drawing which follows the arrow IX-IX of FIG.
- FIG. 4 is a schematic partial cross-sectional perspective view showing a portion near a gas outlet of a partition member similar to FIG.
- the separator 20 is used in a converter exhaust gas treatment facility 10 that processes exhaust gas of a converter 11 that processes hot metal in the steel plant shown in FIG.
- the converter flue gas treatment facility 10 is connected to the hood 12 via a hood 12 positioned above the converter 11, a skirt 13 that connects the converter 11 and the hood 12 in a sealed state, and a duct 19 and is connected to the hood 12 through dust.
- the separator 20 is disposed between the primary dust collector 15 and the secondary dust collector 17.
- Various gas processing devices are disposed downstream of the secondary dust collector 17.
- the secondary dust collector 17 disposed downstream of the separator 20 is provided with a damper 18 for controlling the gas-phase pressure in the converter 11. If dust or the like adheres to the damper 18, the pressure in the converter 11 cannot be controlled with high accuracy, and stable converter operation may be hindered. For this reason, it is necessary to remove dust sufficiently with the separator 20 upstream of the secondary dust collector 17.
- the primary dust collector 15 sprays water on the passing exhaust gas, and collects and removes dust in the exhaust gas with spray water.
- Exhaust gas from the primary dust collector 15 includes water droplets (hereinafter referred to as water droplets) that are sprayed and collected to collect and remove dust.
- the separator 20 according to the first embodiment of the present invention separates water droplets from the exhaust gas discharged from the primary dust collector 15.
- the separator 20 includes a housing 21 that forms a passage and at least one partition member 30 that divides the internal space of the housing 21.
- the housing 21 has a gas inlet 22 opened upward in the vertical direction and a gas outlet 23 opened in the horizontal direction.
- the housing 21 has inner and outer wall portions 21a and 21b extending along a quadrant having a central angle of approximately 90 °, and side wall portions 21c and 21d connected to the inner and outer wall portions and extending in the vertical direction.
- the passage has a rectangular cross section perpendicular to the central axis O (FIG. 4) and is bent at approximately 90 °.
- the housing 21 extends in the vertical direction at the first portion adjacent to the gas inlet 22, and extends in the horizontal direction at the second portion adjacent to the gas outlet 23. Further, a water outlet 24 that opens downward is provided in the vicinity of the gas outlet 23 in the outer wall portion 21b.
- the partition member 30 is formed of a thin plate member extending substantially parallel to the inner and outer wall portions 21a and 21b, and a dam portion 31 is formed at an end portion on the downstream side in the gas flow direction.
- the two partition members 30 are arrange
- a portion of the partition member 30 in the vicinity of the gas outlet 23 extends horizontally. As shown in FIG. 4, the horizontal portion in the vicinity of the gas outlet 23 is inclined so as to descend downward from the central portion in the width direction (transverse direction with respect to the gas flow) toward the side wall portions 21c and 21d of the housing 21. is doing.
- a dam portion 31 is provided to dam the dust-containing water flowing along the surface of the partition member 30.
- the dam part 31 is formed in the half cylinder shape by winding up the edge part of the partition member 30 upwards.
- the dam portion 31 extends in the transverse direction with respect to the gas flow direction over the entire width of the partition member 30.
- the dam portion 31 has a height H 0 sufficient to discharge the dust-containing water flowing along the surface of the partition member 30 from a drain port 32 described later.
- the height H 0 can be appropriately selected according to the flow rate of the water droplets, but as an example, it is preferable to satisfy 200 mm ⁇ H 0 ⁇ 400 mm.
- the height H 0 of the weir part is less than 200 mm, under normal operating conditions, dust-containing water may get over the weir part 31 and re-scatter into the exhaust gas flowing through the housing 21. Further, the higher the dam portion 31, the more difficult the dust-containing water gets over the dam portion 31, but the pressure loss of the exhaust gas flowing through the separator 20 increases.
- the height H 0 of the weir part is 400 mm under normal operating conditions, it is possible to prevent dust-containing water from getting over the weir part.
- the partition member 30 is inclined so as to be lowered downward from the central portion in the width direction toward the both side wall portions 21c and 21d of the housing 21, and therefore, along the surface of the partition member 30.
- the flowing dust-containing water flows toward the end in the width direction of the partition member 30 in the vicinity of the gas outlet 23.
- a drain pipe 28 is connected to the end portion in the width direction of the weir portion 31.
- a drain port 32 that opens toward the inside of the dam portion 31 is formed on the side surface of the drain pipe 28 to which the dam portion 31 is connected.
- the drain pipe 28 is disposed in the housing 21.
- a deflector 35 is provided on the upper surface of the partition member 30 to direct the dust-containing water flowing along the surface of the partition member 30 toward the drain port 32 toward both ends in the width direction.
- the deflector 35 is formed of a substantially isosceles triangular member that expands downstream in the gas flow direction in the housing 21. That is, the side surfaces 35a and 35b forming the two oblique sides of the deflector 35 converge toward each other toward the upstream side, and one end portions of the housing 21 are connected to each other at the center in the width direction to form a vertex 35c.
- a base portion 35 d that forms the bottom side of the deflector 35 is disposed in the dam portion 31.
- the side surfaces 35a and 35b of the deflector 35 are preferably slightly curved in a concave shape as shown in FIG.
- the height H of the deflector 35 is preferably selected in the range of 0.5 ⁇ H 0 ⁇ H ⁇ 1.0 ⁇ H 0 .
- H 0 is the height of the dam portion 31.
- the exhaust gas discharged from the primary dust collector 15 composed of a gas-liquid two-phase flow containing water droplets flows into the housing 21 from the gas inlet 22 and is discharged from the gas outlet 23 to the downstream secondary dust collector 17.
- the water droplets adhere to the surface of the outer wall portion 21b of the housing 21 and the inner surface of the partition member 30, and flow along the surface as dust-containing water.
- the dust-containing water flowing along the surface of the outer wall 21b is discharged from the water outlet 24 provided on the outer wall 21b to the outside of the housing 21.
- the dust-containing water that flows along the surface of the partition member 30 flows along the side surfaces 35 a and 35 b of the deflector 35 from the central portion in the width direction of the partition member 30 toward the drain port 32 by the deflector 35.
- the water is discharged from the drain port 32 to the outside of the housing 21 through the drain pipe 28.
- the dust-containing water flowing along the surface of the partition member 30 is urged in the width direction by the side surfaces 35 a and 35 b of the deflector 35.
- dust-containing water tends to stay in a portion where the vicinity of the gas outlet 23 of the partition member 30 extends horizontally, but according to the present invention, the flow rate of the dust-containing water is increased by the deflector 35. It can be raised and dust accumulation is effectively prevented.
- the dust-containing water flowing along the surface of the partition member 30 can be reliably discharged from the weir portion 31 to the drain pipe 28 through the drain port 32, so that water droplets can be satisfactorily separated from the exhaust gas.
- clean exhaust gas is supplied to the secondary dust collector 17 disposed downstream of the separator 20, and dust is prevented from adhering to the damper 18 of the secondary dust collector 17. Control can be performed with high accuracy.
- the partition member 30 has a shape in which the partition member 30 is inclined so as to gradually fall downward from the central portion in the width direction toward both side wall portions 21c and 21d of the housing 21 in the vicinity of the gas outlet 23, Drain ports 32 are provided at both ends in the width direction of 31, and the dust-containing water flowing in the center in the width direction of the partition member 30 is directed toward the drain ports 32 by the side surfaces 35 a and 35 b of the substantially triangular deflector 35. It is possible to reliably prevent dust accumulation due to the dust-containing water staying in the weir 31.
- the height H of the deflector 35 is H ⁇ 0.5 ⁇ H 0 with respect to the height H 0 of the weir 31, and therefore flows along the surface of the partition member 30. Dust containing water can be guided to the drain port 32 side. Further, since the height H of the deflector 35 is H ⁇ 1.0 ⁇ H 0 with respect to the height H 0 of the dam portion 31, water droplets can be more reliably separated from the exhaust gas by the dam portion 31. Become. In the case of the halved cylindrical dam portion 31 as in the present embodiment, the height H 0 of the dam portion 31 corresponds to the diameter of the halved cylinder formed by the dam portion 31.
- FIG. 6 shows an actual treatment of exhaust gas discharged from a converter operated for 4 months, using the separator according to the present invention and the separator according to the comparative example, and the accumulated height of dust on the partition member is shown. It shows the average dust deposition rate measured and divided by the number of charges used.
- FIG. 7 shows the result of calculating water droplets (overflow water amount) discharged from the gas outlet side during use using the fluid calculation software (FLUENT) based on the above operating conditions for the comparative example and the present invention. Yes.
- FLUENT fluid calculation software
- the average dust deposition rate is significantly smaller than that of the comparative example, and it is confirmed that dust accumulation is sufficiently prevented.
- the amount of overflow water is greatly reduced compared to the comparative example, and it has been confirmed that the exhaust gas and water droplets introduced from the primary dust collector are well separated.
- the separator 120 by the 2nd Embodiment of this invention is demonstrated.
- the separator 120 according to the second embodiment separates water droplets from the exhaust gas discharged from the wet primary dust collector 15 (FIG. 1), similarly to the separator 20 according to the first embodiment.
- the separator 120 according to the present embodiment includes a housing 121 that forms a passage, and at least one partition member 130 that divides the internal space of the housing 121.
- the housing 121 has a gas inlet 122 opened upward in the vertical direction and a gas outlet 123 opened in the horizontal direction.
- the housing 121 has inner and outer wall portions 121a and 121b extending along a quadrant having a central angle of approximately 90 °, and side wall portions 121c and 121d connected to the inner and outer wall portions and extending in the vertical direction.
- a passage having a rectangular cross section perpendicular to the central axis O (FIG. 9) and bent at approximately 90 ° is formed.
- the housing 121 extends in the vertical direction at the first portion adjacent to the gas inlet 122 and extends downward from the horizontal direction or the horizontal direction at the second portion adjacent to the gas outlet 123. Further, a water outlet 124 opened downward is provided in the vicinity of the gas outlet 123 in the outer wall 121b.
- the partition member 130 is formed of a thin plate member extending substantially parallel to the inner and outer wall portions 121a and 121b, and a weir portion 131 is formed at an end portion on the downstream side in the gas flow direction.
- the two partition members 130 are arrange
- a dam portion 131 is provided to block the dust-containing water flowing along the surface of the partition member 130.
- the dam portion 131 is formed in a half-cylindrical shape by winding the end portion of the partition member 130 upward.
- the weir 131 extends in the transverse direction with respect to the gas flow direction over the entire width of the partition member 130.
- the weir part 131 has a height H 0 sufficient to discharge dust-containing water flowing along the surface of the partition member 130 from a drain outlet 132 described later.
- the height H 0 can be appropriately selected according to the flow rate of the water droplets, but as an example, it is preferable that 200 mm ⁇ H 0 ⁇ 400 mm.
- the height H 0 of the weir is less than 200 mm, under normal operating conditions, dust-containing water may get over the weir 131 and re-scatter into the exhaust gas flowing through the housing 121.
- the higher the dam portion 131 is the more difficult the dust-containing water gets over the dam portion 131, but the pressure loss of the exhaust gas flowing through the separator 120 increases.
- the height H 0 of the weir part is 400 mm under normal operating conditions, it is possible to prevent dust-containing water from getting over the weir part.
- the partition member 130 is inclined so as to be lowered downward from the central portion in the width direction toward the both side wall portions 121c and 121d of the housing 121, and therefore along the surface of the partition member 130.
- the flowing dust-containing water flows toward the end in the width direction of the partition member 130 in the vicinity of the gas outlet 123.
- a drain pipe 28 is connected to the end portion in the width direction of the weir portion 131.
- a drain outlet 132 that opens into the dam 131 is formed on the side surface of the drain pipe 128 to which the dam 131 is connected.
- the drain pipe 128 is disposed in the housing 121.
- the partition member 130 does not extend horizontally in the vicinity of the gas outlet 123, and has an angle ⁇ with respect to the horizontal plane so as to go downward toward the gas outlet 123 side. It is inclined.
- the inclination angle ⁇ is preferably selected in the range of 5 ° ⁇ ⁇ ⁇ 25 °.
- the inclination angle ⁇ is preferably selected according to the amount of water V of the water droplets introduced from the primary dust collector 15 into the housing 121.
- the amount V of water droplets introduced into the housing 121 is 400 m 3 / h or more and less than 900 m 3 / h
- the inclination angle ⁇ is selected in the range of 5 ° ⁇ ⁇ ⁇ 25 °.
- the amount of water V of the water droplets introduced into the housing 121 is 900 m 3 / h or more, it is selected in the range of 5 ° ⁇ ⁇ ⁇ 0.091 ⁇ V + 106.81.
- the exhaust gas discharged from the primary dust collector 15 composed of a gas-liquid two-phase flow containing water droplets flows into the housing 21 from the gas inlet 22 and is discharged from the gas outlet 23 to the downstream secondary dust collector 17.
- the water droplets adhere to the surface of the outer wall portion 21b of the housing 121 and the inner surface of the partition member 130, and flow along the surface as dust-containing water.
- the dust-containing water flowing along the surface of the outer wall 121b is discharged to the outside of the housing 121 from the water outlet 124 provided in the outer wall 121b.
- the dust-containing water that flows along the surface of the partition member 130 reaches the dam portion 131, then flows in the width direction along the dam portion 131, and is discharged from the drain port 32 to the outside of the housing 21 through the drain pipe 128.
- the region adjacent to the weir 131 in the partition member 130 disposed inside the housing 121 is inclined with respect to the horizontal plane ⁇ ( ⁇ ⁇ 5 °), the flow rate of the dust-containing water is increased. This prevents the dust-containing water from staying in the weir 131 and prevents dust from accumulating on the partition member 130.
- the dust-containing water flowing along the surface of the partition member 130 can be reliably discharged from the weir portion 131 to the drain pipe 128 through the drain port 132, so that water droplets can be satisfactorily separated from the exhaust gas. Become.
- the above-described inclination angle ⁇ is preferably selected according to the flow rate V of water droplets introduced from the primary dust collector 15 into the housing 121, and more specifically, the water droplets flowing into the housing 121.
- the flow rate V is 400 m 3 / h or more and less than 900 m 3 / h, 5 ° ⁇ ⁇ ⁇ 25 °
- the flow rate V is 900 m 3 / h or more, 5 ° ⁇ ⁇ ⁇ 0.091 ⁇ V + 106.81
- the inclination angle of the partition member 130 is optimized according to the flow rate V of the water droplets, and it is possible to more reliably prevent dust-containing water from getting over the weir part 131 and re-scattering in the exhaust gas. It was experimentally found that water droplets can be well separated from exhaust gas.
- the inclination angle ⁇ may be 25 ° or less, but when the water drop flow rate V is 900 m 3 / h or more, the flow rate V Experimenting that by reducing the upper limit value of the inclination angle ⁇ in proportion to the increase, it is possible to more reliably prevent dust-containing water from getting over the weir 131 and re-scattering into the exhaust gas flowing through the housing 121. I found it.
- the height H 0 of the dam portion 131 is set within the range of 200 mm ⁇ H 0 ⁇ 400 mm, the inclination angle of the region connected to the dam portion 131 in the partition member 130 with respect to the horizontal plane Even if ⁇ is set to 5 ° ⁇ ⁇ ⁇ 25 °, the dust-containing water flowing along the surface of the partition member 130 can be damped, and water droplets can be separated from the exhaust gas.
- the height H 0 of the weir 131, weir portion 131 corresponds to the diameter of the eggplant semi-cylindrical.
- FIG. 11 shows the result of calculating water droplets (overflow water amount) discharged from the gas outlet side during use using the fluid calculation software (FLUENT) based on the above operating conditions for the comparative example and the present invention. Show.
- the average dust deposition rate is significantly smaller than that of the comparative example, and dust accumulation is sufficiently prevented.
- the amount of overflow water is significantly reduced compared to the comparative example, and it has been confirmed that the exhaust gas and water droplets introduced from the primary dust collector are well separated.
- the partition member 30 has a portion in the vicinity of the gas outlet 22 extending horizontally.
- the present invention is not limited to this, and as in the second embodiment, the gas You may make it incline so that the vicinity part of the exit 22 may go below.
- a separator 220 according to a third embodiment of the present invention will be described with reference to FIG.
- the third embodiment is a combination of the first and second embodiments.
- the separator 220 separates water droplets from the exhaust gas discharged from the wet primary dust collector 15 (FIG. 1).
- the separator 220 includes a housing 221 that forms a passage and at least one partition member 230 that divides the internal space of the housing 221.
- the housing 221 has a gas inlet 222 opened upward in the vertical direction and a gas outlet 223 opened in the horizontal direction.
- the housing 221 includes inner and outer wall portions 221a and 21b extending along a quadrant having a central angle of approximately 90 °, and side wall portions 2221c and 221d connected to the inner and outer wall portions and extending in the vertical direction.
- a passage having a rectangular cross section perpendicular to the central axis O and bent at approximately 90 ° is formed.
- the housing 221 extends in the vertical direction in the first portion adjacent to the gas inlet 222 and extends in a horizontal direction or inclined downward from the horizontal direction in the second portion adjacent to the gas outlet 223.
- a water outlet 224 that opens downward is provided in the vicinity of the gas outlet 223 in the outer wall portion 21b.
- the partition member 230 is formed of a thin plate member extending substantially parallel to the inner and outer wall portions 221a and 21b, and a dam portion 231 is formed at an end portion on the downstream side in the gas flow direction.
- two partition members 230 are disposed in the housing 221, and the internal space of the housing 221 is divided into three in the vertical direction by the partition member 230.
- a portion of the partition member 230 near the gas outlet 223 is lowered from the central portion in the width direction (transverse direction with respect to the gas flow) toward the side wall portions 221c and 221d of the housing 221. It is inclined to.
- the portion in the vicinity of the gas outlet 223 or the region adjacent to the dam portion 231 extends from the dam portion 231 to the connection portion with the portion where the partition member 230 is curved along the arc in the gas flow direction upstream. It is an area.
- a dam portion 231 is provided to block the dust-containing water flowing along the surface of the partition member 230.
- the dam portion 231 is formed in a half-cylindrical shape by winding the end portion of the partition member 230 upward.
- the dam portion 231 also extends across the entire width of the partition member 230 in a direction transverse to the gas flow direction.
- the dam portion 231 has a height H 0 sufficient to discharge the dust-containing water flowing along the surface of the partition member 230 from a drain outlet 232 described later.
- the height H 0 can be appropriately selected according to the flow rate of the water droplets, but as an example, it is preferable that 200 mm ⁇ H 0 ⁇ 400 mm.
- the height H 0 of the weir part is less than 200 mm, under normal operating conditions, dust-containing water may get over the weir part 231 and re-scatter in the exhaust gas flowing through the housing 221. Further, the higher the dam portion 231, the more difficult the dust-containing water gets over the dam portion 231, but the pressure loss of the exhaust gas flowing through the separator 220 increases.
- the height H 0 of the weir part is 400 mm under normal operating conditions, it is possible to prevent dust-containing water from getting over the weir part.
- the partition member 230 is inclined so as to be lowered downward from the central portion in the width direction toward the both side wall portions 221c and 221d of the housing 221, and therefore, along the surface of the partition member 230.
- the flowing dust-containing water flows toward the end in the width direction of the partition member 230 in the vicinity of the gas outlet 223.
- a drain pipe 228 is connected to the end in the width direction of the weir 231.
- a drain outlet 232 that opens into the dam 231 is formed on the side surface of the drain pipe 228 to which the dam 231 is connected.
- the drain pipe 228 is disposed in the housing 221.
- a deflector 235 that directs the dust-containing water flowing along the surface of the partition member 230 toward the both ends in the width direction is disposed on the upper surface of the partition member 230.
- the deflector 235 is formed of a substantially isosceles triangular member that expands downstream in the gas flow direction in the housing 221. That is, the side surfaces 235a and 225b forming the two hypotenuses of the deflector 235 converge toward each other toward the upstream side, and one end of each of the side surfaces 235a and 225b of the deflector 235 is connected to each other at the center in the width direction of the housing 221 to form a vertex 235c.
- a base portion 235 d that forms the bottom side of the deflector 235 is disposed in the dam portion 231.
- the side surfaces 235a and 225b of the deflector 235 are preferably slightly curved in a concave shape as shown in FIG.
- the height H of the deflector 235 is preferably selected in the range of 0.5 ⁇ H 0 ⁇ H ⁇ 1.0 ⁇ H 0 .
- H 0 is the height of the weir 231.
- the partition member 230 does not extend in the vicinity of the gas outlet 223 horizontally, and the angle ⁇ with respect to the horizontal plane is directed downward toward the gas outlet 223. It is inclined with.
- the inclination angle ⁇ is preferably selected in the range of 5 ° ⁇ ⁇ ⁇ 25 °.
- the inclination angle ⁇ is preferably selected according to the amount V of water droplets introduced from the primary dust collector 15 into the housing 221.
- the amount V of water introduced into the housing 221 is 400 m 3 / h or more and less than 900 m 3 / h
- the inclination angle ⁇ is selected in the range of 5 ° ⁇ ⁇ ⁇ 25 °.
- the amount V of water droplets introduced into the housing 221 is 900 m 3 / h or more, it is selected in the range of 5 ° ⁇ ⁇ ⁇ 0.091 ⁇ V + 106.81.
- the shape of the weir portion is not limited to the present embodiment, and may have other shapes and structures.
- the water droplets may be discharged only from one side in the width direction.
- the deflector has been described as having a substantially isosceles triangular plate shape, the deflector is not limited to this, and the deflector discharges the dust-containing water flowing along the surface of the partition member, such as an unequal triangle, to the drain outlet. Any other shape may be used as long as it can be directed toward.
- the deflector should be substantially triangular. More preferably, the deflector has a substantially isosceles triangle shape.
- the present invention can be used for an exhaust gas treatment apparatus having a wet dust collector.
- the effect is demonstrated in dust processing in the steel industry.
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Abstract
Description
前記仕切部材には、前記仕切部材の表面に沿って流れるダスト含有水を前記排水口へ向けて方向付けるデフレクターが配設されていることを特徴とするセパレーターが提供される。
また、前記排水口は前記堰部において前記ハウジング内のガスの流れ方向に対して横断方向の両端部に開口するように前記排水管に形成することができる。
前記デフレクターの前記仕切部材からの突出高さHは、好ましくは、前記堰部の高さH0に対して0.5×H0≦H≦1.0×H0の範囲から選択される。
400m3/h≦V<900m3/hのとき、5°≦θ≦25°
V≧900m3/hのとき、5°≦θ≦-0.091×V+106.81
前記少なくとも1つの仕切部材は、前記ガス出口側において前記ハウジングの内部空間を上下に区分けするように配置されており、前記仕切部材において前記ハウジング内のガスの流れ方向に前記堰部に隣接する領域は、下流へ向かって傾斜角度θを以って下方に傾斜しており、前記傾斜角度θが5°≦θ≦25°であることを特徴とするセパレーターが提供される。
本実施形態によるセパレーター20は、一例として、図1に示す製鉄プラントにおいて溶銑を処理する転炉11の排ガスを処理する転炉排ガス処理設備10で用いられる。転炉排ガス処理設備10は、転炉11の上方に位置するフード12と、転炉11とフード12とを密閉状態で接続するスカート13と、ダクト19を介してフード12に接続され排ガスからダストを除去する湿式の1次集塵機15と、ダクト19内に配設され転炉11からの排ガスを冷却する排ガス冷却器14と、1次集塵機15の下流に配設された2次集塵機17とを備えている。本実施形態において、セパレーター20は、1次集塵機15と2次集塵機17との間に配設されている。なお、2次集塵機17の下流には、各種ガス処理装置が配設される。
水滴を含んだ気液二相流から成る1次集塵機15から排出された排ガスが、ガス入口22からハウジング21内へ流入し、ガス出口23から下流の2次集塵機17へ排出される。水滴は、ハウジング21の外側壁部21bの表面および仕切部材30の内側の表面に付着し、ダスト含有水として該表面に沿って流れる。
本発明のセパレーターとして、400mmの高さH0を有した堰部および400mmの高さHを有したデフレクターとを備えたセパレーターを準備し、デフレクターを備えないセパレーター(比較例)と比較した。
第2の実施形態によるセパレーター120は、第1の実施形態によるセパレーター20と同様に、湿式の1次集塵機15(図1)から排出された排ガスから水滴を分離する。本実施形態によるセパレーター120は、図8に示すように、通路を形成するハウジング121と、ハウジング121の内部空間を分割する少なくとも1つの仕切部材130とを備えている。ハウジング121は、鉛直方向上方に開口したガス入口122と、水平方向に開口したガス出口123とを有している。また、ハウジング121は、中心角が略90°の四分円に沿って延設された内外側壁部121a、121bと、内外側壁部に連結され鉛直方向に延びる側壁部121c、121dを有して、中心軸線Oに対して垂直な矩形断面(図9)を有し概ね90°に屈曲した通路を形成している。こうして、ハウジング121は、ガス入口122に隣接した第1の部分では鉛直方向に延設され、ガス出口123に隣接した第2の部分では水平方向または水平方向から下方に延設されている。また、外側壁部121bにおいてガス出口123の近傍には、下方に向けて開口した水出口124が設けられている。
水滴を含んだ気液二相流から成る1次集塵機15から排出された排ガスが、ガス入口22からハウジング21内へ流入し、ガス出口23から下流の2次集塵機17へ排出される。水滴は、ハウジング121の外側壁部21bの表面および仕切部材130の内側の表面に付着し、ダスト含有水として該表面に沿って流れる。
本発明のセパレーターとして、仕切部材において堰部に隣接する部分が傾斜角度θをθ=25°を以って水平面に対して下方に傾斜させたセパレーターを準備し、堰部に隣接する部分が水平に延設されたセパレーター(比較例)と比較した。
12 フード
13 スカート
14 排ガス冷却器
15 次集塵機
17 次集塵機
18 ダンパー
19 ダクト
20 セパレーター
21 ハウジング
21a 内側壁部
21b 外側壁部
21c 側壁部
21d 側壁部
22 ガス入口
23 ガス出口
24 水出口
28 排水管
30 仕切部材
31 堰部
32 排水口
35 デフレクター
35a 側面
35b 側面
35c 頂点
120 セパレーター
121 ハウジング
121a 内側壁部
121b 外側壁部
121c 側壁部
121d 側壁部
122 ガス入口
123 ガス出口
124 水出口
128 排水管
130 仕切部材
131 堰部
132 排水口
220 セパレーター
221 ハウジング
221a 内側壁部
221b 外側壁部
221c 側壁部
221d 側壁部
222 ガス入口
223 ガス出口
224 水出口
228 排水管
230 仕切部材
231 堰部
232 排水口
235 デフレクター
235a 側面
235b 側面
235c 頂点
Claims (7)
- 排ガスに含まれるダストを集塵する湿式集塵機の下流に接続され、前記湿式集塵機からの排ガスからダストを含有する水滴を分離するセパレーターにおいて、
上方に開口し前記湿式集塵機からの排ガスを受け入れるガス入口と、水平方向もしくはそれより下方に開口したガス出口とを有し、ガス入口からガス出口へ流通する排ガスの流れの方向を変更する通路を形成するハウジングと、
前記ハウジング内に配設され該ハウジングの内部空間を区分けする少なくとも1つの仕切部材であって、前記仕切部材の表面に沿って流れるダスト含有水をせき止める堰部が該少なくとも1つの仕切部材の前記ガス出口側の端部に設けられて成る少なくとも1つの仕切部材と、
排水口を介して前記堰部に連通し、前記堰部によってせき止められたダスト含有水を、前記堰部からハウジング外に排出する排水管とを具備し、
前記仕切部材は、前記ガス出口側において前記ハウジングの内部空間を上下に区分けするように配置されており、
前記仕切部材には、前記仕切部材の表面に沿って流れるダスト含有水を前記排水口へ向けて方向付けるデフレクターが配設されていることを特徴とするセパレーター。 - 前記排水口は前記堰部において前記ハウジング内のガスの流れ方向に対して横断方向の両端部に開口するように前記排水管に形成されており、前記デフレクターは、前記ガスの流れ方向に上流側に頂点を有し、該頂点から前記ガスの流れ方向に下流へ向けて拡開する略三角板状をなしていることを特徴とする請求項1に記載のセパレーター。
- 前記デフレクターの前記仕切部材からの突出高さHが前記堰部の高さH0に対して以下の関係を満たすことを特徴とする請求項1または2に記載のセパレーター。
0.5×H0≦H≦1.0×H0 - 前記仕切部材において前記ハウジング内のガスの流れ方向に前記堰部に隣接する領域は、下流へ向かってのガス出口側端部の水平方向に対する傾斜角度θが5°≦θ≦25°であることを特徴とする請求項1または2に記載のセパレーター。
- 前記仕切部材において前記ハウジング内のガスの流れ方向に前記堰部に隣接する領域は、下流へ向かってのガス出口側端部の水平方向に対する傾斜角度θが5°≦θ≦25°であることを特徴とする請求項3に記載のセパレーター。
- 前記ハウジングに導入されるダスト含有水の水量Vと前記傾斜角度θとが以下の関係を満たすことを特徴とする請求項4に記載のセパレーター。
400m3/h≦V<900m3/hのとき、5°≦θ≦25°
V≧900m3/hのとき、5°≦θ≦-0.091×V+106.81 - 前記ハウジングに導入されるダスト含有水の水量Vと前記傾斜角度θとが以下の関係を満たすことを特徴とする請求項5に記載のセパレーター。
400m3/h≦V<900m3/hのとき、5°≦θ≦25°
V≧900m3/hのとき、5°≦θ≦-0.091×V+106.81
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CN2525390Y (zh) * | 2002-03-04 | 2002-12-11 | 宁海泽 | 导波旋涡高效除尘脱硫脱水设备 |
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JPS5175266A (ja) * | 1974-12-25 | 1976-06-29 | Tokyo Shibaura Electric Co | Kiekibunriki |
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CN113621752B (zh) * | 2021-08-31 | 2022-08-05 | 东北大学 | 一种降低颗粒物排放的转炉一次除尘系统及其使用方法 |
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