JP2017066447A - Evacuation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evacuation device which can wash and eject dust sticking in a booster without blockage.SOLUTION: One end of a drain pipe 20 extending straight to vertical direction downward is connected to an end 3a of a booster 3. Another end of the drain pipe 20 is inserted to an inside of a first vessel 21. The drain pipe 20 is provided with an opening and shutting valve 24. The first vessel 21 communicates with a second vessel 22 through a wash water circulation pipe 23. Both ends of the wash water circulation pipe 23 are respectively connected to side surfaces of the first vessel 21 and the second vessel 22 at positions as close as possible to the upper openings.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vacuum exhaust apparatus for a vacuum degassing apparatus such as VOD or RH.

  A conventional vacuum exhaust apparatus of an RH vacuum degassing apparatus is disclosed in Patent Document 1. This vacuum evacuation device includes a multistage decompression booster whose one end communicates with the RH vacuum degassing device via an exhaust duct and the other end is connected to a condenser. The decompression multistage booster is provided so as to incline downward in the vertical direction from an end communicating with the RH vacuum degassing apparatus toward an end connected to the condenser.

  The exhaust gas from the RH vacuum degassing apparatus may contain dust, and when this exhaust gas flows into the multistage booster for pressure reduction, dust adheres to the inner wall, and the vacuum generation function may be lowered. For this reason, the vacuum exhaust apparatus disclosed in Patent Document 1 is provided with a filter for collecting dust between the multistage booster for decompression and the condenser. The collected dust is removed from the filter by washing with water using a washing spray device, and is discharged from the vacuum exhaust device via a condenser.

  However, in the vacuum evacuation device described in Patent Document 1, since one end of the decompression multistage booster is located higher than the condenser, the vacuum evacuation device becomes larger and the building in which the vacuum evacuation device is installed needs to have a higher ceiling. It will increase in size. In contrast, from the end connected to the condenser to the end on the side communicating with the RH vacuum degassing apparatus, it is directed downward in the vertical direction (that is, in the direction opposite to the inclination direction of the multistage booster for decompression in Patent Document 1). ) If the multistage booster for pressure reduction is provided so as to incline, the overall height is lowered, so that the vacuum exhaust device can be miniaturized. However, in this case, the wastewater when the dust adhering to the inner wall of the multistage booster for decompression is washed with water needs to be discharged from the end on the side communicating with the RH vacuum degasser to the drainage layer via the drainage pipe. There is.

JP-A-8-311533

  In the case where the multistage booster for pressure reduction is provided so as to incline in the direction opposite to the inclination direction of the multistage booster for pressure reduction in Patent Document 1, depending on the arrangement of the drain pipe and the drainage layer, the drainage may stay in the middle, There was a possibility that the dust could block the drainage path by evaporating. Further, the waste water remains in the multistage booster for decompression, which may affect the vacuum generation function.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an evacuation apparatus capable of cleaning and discharging dust adhering to the booster without blocking it.

The vacuum exhaust apparatus according to the present invention includes a booster having one end communicating with the vacuum tank, and a condenser communicating with the other end of the booster, and the booster is provided so as to incline vertically downward from the other end toward the one end. A vacuum exhaust apparatus for exhausting the inside of the vacuum tank, wherein the booster is provided with cleaning water supply means for supplying cleaning water for cleaning the inside of the booster, and at one end of the booster, the cleaning water supply One end of a drain pipe through which the wash water supplied from the means flows is connected, and any part of the drain pipe is provided so as to form an angle of 0 ° or more and less than 90 ° with respect to the downward direction in the vertical direction.
The drain pipe may be provided so as to form an angle of 0 ° with respect to the downward downward direction along the entire length thereof.
The other end of the drain pipe communicates with a drain tank that temporarily stores cleaning water containing dust, and the drain tank receives the first tank that settles and separates dust and the cleaning water that is separated from dust in the first tank. You may provide the 2nd tank to do.

  According to the present invention, any part of the drainage pipe through which the wash water that has washed the inside of the booster flows is provided so as to form an angle of 0 ° or more and less than 90 ° with respect to the downward direction in the vertical direction. Since the washing water does not stay in the pipe, the dust adhering to the booster can be washed and discharged without blocking.

1 is a schematic configuration diagram of a vacuum exhaust apparatus according to an embodiment of the present invention. It is a schematic block diagram of the modification of the drainage tank of the vacuum exhaust apparatus which concerns on this embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, a vacuum exhaust apparatus 10 for exhausting the inside of the vacuum tank 1 is connected to a vacuum tank 1 of a vacuum degassing apparatus such as VOD or RH. The evacuation apparatus 10 includes a condenser 2 and a booster 3 in which steam ejectors are arranged in multiple stages (in this embodiment, three stages, but not limited to three stages). One end 3 a of the booster 3 communicates with the vacuum tank 1 through the exhaust duct 4. A gas cooler 5 is provided in the exhaust duct 4.

  The capacitor 2 includes a first capacitor 2a and a second capacitor 2b provided downstream of the first capacitor 2a. The other end 3b of the booster 3 is connected to the first capacitor 2a. The other end of the steam line 12 whose one end is connected to the steam header 11 is connected to the second capacitor 2b, and an ejector 13 is provided on the steam line 12. In the first condenser 2a and the second condenser 2b, the other ends of the cooling water lines 15a and 15b, one end of which is connected to the cooling water header 14, are inserted into the first condenser 2a and the second condenser 2b, respectively. They are connected so that they face downward in the vertical direction. One ends of drain pipes 31 a and 31 b are connected to the bottoms of the first capacitor 2 a and the second capacitor 2 b, respectively, and the other ends thereof are inserted into the hot well 30.

  The booster 3 is provided so as to be inclined downward in the vertical direction from the end 3b toward the end 3a. The booster 3 is connected so that the other ends of the three steam lines 16a, 16b, 16c, one end of which is connected to the steam header 11, are inserted into the steam ejectors of the booster 3 and face the end 3b. Has been. Further, the other end of the three washing water lines 18a, 18b, 18c, one end of which is connected to the water source 17, is inserted into each steam ejector of the booster 3 so as to face the end 3a side. It is connected. Open / close valves 19a, 19b, 19c are provided in the cleaning water lines 18a, 18b, 18c, respectively. Here, the cleaning water lines 18 a, 18 b, 18 c and the open / close valves 19 a, 19 b, 19 c constitute cleaning water supply means for supplying cleaning water to the inside of the booster 3.

  One end of a drain pipe 20 that extends straight downward in the vertical direction is connected to the end 3 a of the booster 3. The other end of the drain pipe 20 is inserted into the first tank 21. The drain pipe 20 is provided with an open / close valve 24. The first tank 21 communicates with the second tank 22 through the washing water circulation pipe 23. Both ends of the washing water circulation pipe 23 are connected to the respective side surfaces at positions as close as possible to the upper openings of the first tank 21 and the second tank 22, respectively. The washing water circulation pipe 23 is provided horizontally. One end of the drain pipe 32 is connected to the side surface of the second tank 22, and the other end is inserted into the hot well 30. The drain pipe 32 is provided with a drain pump 33. Here, the first tank 21 and the second tank 22 constitute a drain tank that temporarily stores the wash water discharged from the booster 3 through the drain pipe 20.

Next, the operation of the vacuum exhaust apparatus 10 according to the embodiment of the present invention will be described.
By adjusting the amount and pressure of water vapor supplied to the booster 3 and the ejector 13 to control the degree of vacuum, the gas in the vacuum tank 1 is sucked as exhaust gas. The exhaust gas sequentially flows through the exhaust duct 4, the booster 3, the first condenser 2a, and the second condenser 2b, and then is exhausted to the atmosphere through the exhaust pipe 29 connected to the upper part of the second condenser 2b. Dust may be mixed in the exhaust gas exhausted from the vacuum tank 1. When exhaust gas containing dust flows into the booster 3, it adheres to the inner wall of the booster 3 and the vacuum generation function of the vacuum exhaust device 10 may be lowered. Therefore, the dust attached to the inner wall of the booster 3 is washed. There is a need.

Next, the operation | movement which cleans the dust adhering to the inner wall of the booster 3 is demonstrated.
Washing water is supplied into the booster 3 by opening the on-off valves 19a, 19b, and 19c. Thereby, the cleaning water cleans the dust adhering to the inner wall of the booster 3. Since the booster 3 is provided so as to incline downward in the vertical direction from the end 3b toward the end 3a, the cleaning water containing dust flows down toward the end 3a. By opening the opening / closing valve 24, the cleaning water including dust flowing down toward the end portion 3a flows into the drain pipe 20 and flows down through the drain pipe 20.

  Here, since the drain pipe 20 extends straight downward in the vertical direction, there is no possibility that the washing water stays in the drain pipe 20. For this reason, there is no possibility that the dust contained in the washing water will block the drain pipe 20, and the washing water containing the dust flows into the first tank 21. In the first tank 21, the dust settles and accumulates at the bottom of the first tank 21. Since the washing water circulation pipe 23 is connected to the side surface at a position as close as possible to the upper opening of the first tank 21, dust is not contained in the washing water flowing into the second tank 22 through the washing water circulation pipe 23. Not included. The cleaning water in the second tank 22 is transferred to the hot well 30 by the drain pump 33, but since the transferred cleaning water does not contain dust, the drain pipe 32 and the drain pump 33 are clogged with dust. There is nothing.

  As described above, the drain pipe 20 through which the wash water washed inside the booster 3 circulates is provided so that any part extends straight downward in the vertical direction, so that the wash water stays in the drain pipe 20. Therefore, the dust adhering in the booster 3 can be cleaned and discharged without blocking.

  In this embodiment, the drain pipe 20 is provided so that any part extends straight downward in the vertical direction (that is, any part of the drain pipe 20 forms an angle of 0 ° with respect to the vertical downward direction). However, the present invention is not limited to this form. There may be no horizontal portion in the middle of the drain pipe 20 or a portion that is inclined upward in the vertical direction with respect to the direction in which the cleaning water flows. That is, the drain pipe 20 should just be provided so that any part may make the angle of 0 degree or more and less than 90 degrees with respect to the perpendicular direction downward. However, when an arbitrary portion of the drain pipe 20 forms an angle close to 90 ° with respect to the downward direction in the vertical direction, there is a possibility that the washing water may stay in the portion. For this reason, it is preferable that the drain pipe 20 has an angle close to 0 ° with respect to downward in the vertical direction as much as possible.

  In this embodiment, in the drainage tank, the first tank 21 and the second tank 22 are composed of separate containers, and these containers communicate with each other via the washing water circulation pipe 23. It is not limited. As shown in FIG. 2, the first tank 21 and the second tank 22 may be configured by configuring the drain tank 40 with one container and partitioning the interior of the drain tank 40 by the partition plate member 43. . A notch 44 is formed on the upper side of the partition plate member 43, and the first tank 21 and the second tank 22 can be communicated with each other through the notch 44. Further, instead of the notch 44, by forming a through hole in the vicinity of the upper side of the partition plate member 43, or by making the height of the upper side of the partition plate member 43 lower than the upper opening of the drainage tank 40, The first tank 21 and the second tank 22 may communicate with each other.

  In this embodiment, the number of the second condenser 2b to which steam is supplied via the ejector 13 is one. However, the second condenser may be configured by arranging two or more such condensers in series. Good.

  1 vacuum tank, 2 condenser, 3 booster, 3a (booster) end (one end), 3b (booster) end (other end), 10 vacuum exhaust device, 18a, 18b, 18c Washing water line (washing water supply) Means), 19a, 19b, 19c Open / close valve (washing water supply means), 20 drain pipe, 21 first tank (drain tank), 22 second tank (drain tank), 40 drain tank.

Claims (3)

A booster with one end communicating with the vacuum tank;
A vacuum exhaust device for exhausting the inside of the vacuum tank, comprising a condenser connected to the other end of the booster, wherein the booster is provided so as to incline downward in the vertical direction from the other end toward the one end. And
The booster is provided with cleaning water supply means for supplying cleaning water for cleaning the inside of the booster,
The one end of the booster is connected to one end of a drain pipe through which the cleaning water supplied from the cleaning water supply means flows, and any part of the drain pipe is at least 0 ° and less than 90 ° with respect to the vertical downward direction. Evacuation device provided to make an angle of.   The vacuum exhaust apparatus according to claim 1, wherein the drain pipe is provided so as to form an angle of 0 ° with respect to a downward downward direction along the entire length thereof. The other end of the drain pipe communicates with a drain tank for temporarily storing cleaning water containing dust,
The drainage tank
The vacuum evacuation device according to claim 1, further comprising: a first tank that settles and separates the dust; and a second tank into which cleaning water from which dust has been separated in the first tank flows.

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