JP2013199891A - Operation stopping method for air blower, and air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation stopping method for an air blower which more improves a rust-prevention effect, and to provide the air blower.SOLUTION: An operation stopping method for an air blower having an air blower body for sending, from the outlet side, air (A) which is taken in from an inlet side has a stop preparation step S1 for stopping an inflow and an outflow of air, a gas supply step S2 for supplying inert gas into the air blower body after the stop preparation step S1, a first gas detection step S3 for detecting the filling state of the inert gas in the gas supply step S2, a sealing step S4 for sealing the inert gas into the air blower body according to a result of the first gas detection step S3, a second gas detection step S5 for detecting the filling state of the inert gas after the sealing step S4, and a gas adding step S6 for additionally supplying the inert gas into the air blower body according to a result of the second gas detection step S5.

Description

  The present invention relates to a treatment method at the time of operation stop of a blower, particularly to a rust prevention method.

  The blower is a blower that compresses the sucked gas and applies kinetic energy to the gas for delivery.

  Here, for example, in an ironworks, a blower is used to supply air to a blast furnace. In some cases, a plurality of blowers are connected to one blast furnace, and in this case, some of the plurality of blowers may be shut down depending on the operating state. When the operation is stopped, the inside of the blower is maintained in the state when the operation is stopped, that is, the air taken in from the atmosphere or the like remains in the blower. Therefore, particularly when the operation is stopped for a long time, the moisture contained in the remaining air may cause rust on the blades and the casing of the blower.

  As described above, when rusting occurs on the blade, the aerodynamic performance of the blower decreases due to a change in the cross-sectional shape of the blade, which may cause a reduction in operating efficiency and an increase in cost. Furthermore, if the operation is restarted in a state where rust has been generated, rust will circulate downstream along with the air flow, which may block the piping and the like.

  Here, in Patent Document 1, when an inert gas is supplied to the fuel pipe when the gas burner provided in the boiler furnace is digested, the gas in the furnace containing the corrosive component enters the fuel pipe or the like. A burner device that can prevent corrosion thinning in a fuel pipe or the like is disclosed.

JP 2002-61835 A

  However, it is possible to discharge the air remaining in the blower by applying the method disclosed in Patent Document 1 to the blower, but it has been known so far that such a method has been applied to the blower. It is not done. At present, the wings of the blower are coated with a rust prevention coating to prevent the occurrence of rust and avoid a reduction in operating efficiency. However, to prevent troubles and reduce costs, the rust prevention effect can be further improved. Was needed.

  This invention is made | formed in view of such a situation, and it aims at providing the operation stop method of the air blower which can aim at the further improvement of a rust prevention effect, and an air blower.

In order to solve the above problems, the present invention employs the following means.
That is, the blower operation suspension method according to the present invention is a blower operation suspension method having a blower main body that sends out air sucked from the inlet side from the outlet side, and is a gas that supplies an inert gas into the blower main body. The method includes a supplying step and a sealing step of sealing the inlet side and the outlet side of the blower body after the inert gas is filled in the blower body.

  In such a blower operation stop method, by performing the sealing process after executing the gas supply process, the inert gas is pushed into the blower body while pushing out the air remaining in the blower body with the inert gas. The filled state can be maintained. Therefore, it is possible to avoid the remaining of the atmosphere including moisture, and even if the inert gas filled in the blower body leaks to the outside due to the use of the inert gas, such as ignition. Since there is no danger, safety can be improved.

  Moreover, the said gas supply process may supply the said inert gas in the said air blower main body by performing the no-load operation of the said air blower main body.

  By executing the gas supply step in this manner, the inert gas can be sucked into the blower main body, and thus the inert gas filling speed can be improved.

  Furthermore, in the blower operation stop method according to the present invention, the first gas detection means detects the filling state of the inert gas in the blower body between the gas supply step and the sealing step. A gas detection step may be further provided, and the sealing step may be performed based on a result of the first gas detection step.

  By such a first gas detection step, the concentration of the inert gas in the blower main body, the pressure, etc. are detected by the first gas detection means, and when the detection result becomes, for example, a preset threshold value or more, It is possible to seal the inlet side and the outlet side of the blower body. Therefore, the inert gas can be filled more reliably, and the remaining atmosphere including moisture can be avoided.

  The blower operation stop method according to the present invention includes a second gas detection step of detecting a filling state of the inert gas in the blower body by a second gas detection means after the sealing step, A gas addition step of opening and closing the inlet side of the blower main body and additionally supplying the inert gas based on the result of the two-gas detection step may be further provided.

  After filling with the inert gas and sealing, the inert gas may gradually leak to the outside of the blower body over time. Here, by such a second gas detection step, the gas concentration, pressure, etc. in the blower body are detected by the second gas detection means, and when the detection result falls below a preset threshold value, for example, It becomes possible to supply additional active gas. Therefore, a predetermined amount of inert gas can always be held in the blower body, and it is possible to avoid the occurrence of rust due to the intrusion of air containing moisture.

  Furthermore, the gas supply step may take in the inert gas discharged from the outlet side of the blower body from the inlet side, and circulate and supply the inert gas into the blower body.

  Thus, by circulating the inert gas, the inert gas can be reused, leading to cost reduction.

  Moreover, the said gas supply process may supply the said inert gas in the said air blower main body, after dehumidifying the said inert gas.

  By dehumidifying the inert gas in this way, the dried inert gas can be supplied into the blower main body, and moisture in the blower main body can be more reliably removed. In addition, when circulating the inert gas, it is possible to supply the dried inert gas into the blower body while dehumidifying the inert gas that has absorbed moisture by passing through the blower body. It becomes. Therefore, the generation of rust can be avoided more reliably.

  Furthermore, the blower according to the present invention includes a blower main body that sends out the air sucked from the inlet side from the outlet side, a gas supply path that is connected to the inlet side and that supplies an inert gas, and opens and closes the gas supply path. A first opening / closing means for performing the operation, a gas discharge path connected to the outlet side for discharging the inert gas, and a second opening / closing means for opening / closing the gas discharge path.

  In such a blower, the first opening and closing means and the second opening and closing means are opened, the atmosphere remaining in the blower body is discharged with an inert gas, and then the blower body is filled with an inert gas, The first opening / closing means and the second opening / closing means are closed. In this way, the state in which the inert gas is filled in the blower main body can be maintained, and the rust prevention effect can be improved. Furthermore, safety can be ensured by avoiding dangers such as ignition.

  According to the blower operation stop method and the blower of the present invention, it is possible to fill and hold the inert gas therein, and to further improve the rust prevention effect.

1 is an overall system diagram showing a blower according to a first embodiment of the present invention. It is a flowchart which shows the process of the operation stop method of the air blower which concerns on 1st embodiment of this invention. It is a whole system diagram which shows the air blower which concerns on 2nd embodiment of this invention.

Hereinafter, with reference to FIG. 1, 1A of air blowers which concern on 1st embodiment of this invention is demonstrated.
The blower 1A pumps a gas such as the atmosphere A from the upstream side to the downstream side by the lift generated by the blades of the impeller, which will be described later, and sends it to the outside. being classified.

  The blower 1 </ b> A includes a blower main body 11 that pumps the atmosphere A, a main inflow path 12 connected to the upstream side of the blower main body 11, a first main valve 13 provided in the middle position of the main inflow path 12, and a blower main body. 11 and a second main valve 15 provided at a midway position of the main outflow passage 14.

Further, the blower 1A includes a gas supply path 21 that allows one end 21a to be connected to the main inflow path 12 between the first main valve 13 and the blower body 11, and allows the inert gas G to flow in, and a gas supply path. And a first gas on-off valve (first on-off means) 23 provided at a midway position 21.
And between the 2nd main valve 15 and the air blower main body 11, the 2nd gas on-off valve (the 2nd gas on-off valve 22 provided in the middle position of the gas exhaust path 22 with which the end 22a was connected to the main outflow path 14 and the gas exhaust path 22) Two opening / closing means) 24.

  Further, the first gas detection means 31 disposed between the second gas on-off valve 24 and the other end 22 b of the gas discharge path 22, and the fan main body 11 and the one end 22 a of the gas discharge path 22 are disposed. Second gas detection means 34.

  Although not shown, the blower main body 11 includes an impeller having a plurality of blades therein, and the rotation of the impeller takes in the atmosphere A from the upstream side serving as the inlet side and the downstream serving as the outlet side. It pumps to the side.

  The main inflow path 12 is configured by piping or the like, and allows the atmosphere A to flow into the blower body 11.

  The first main valve 13 is an on-off valve device that allows the air A from the main inflow passage 12 to flow into the blower body 11 and can be stopped.

  The main outflow passage 14 is constituted by piping or the like, and sends out the compressed air A through the blower body 11 to the outside.

  The second main valve 15 is an on-off valve device, and can send out the atmosphere A flowing through the main outflow passage 14 to the outside, and can stop the sending.

  The gas supply path 21 is constituted by a pipe or the like. For example, a cylinder 2 that holds an inert gas G of nitrogen or a rare gas (such as argon) in a high pressure state is connected to the other end 21b, and the inert gas G is supplied to the blower. It is made to flow into the main body 11.

  The first gas on-off valve 23 is an on-off valve device that allows the inert gas G from the gas supply path 21 to flow into the blower body 11 and to stop.

  The gas discharge path 22 is configured by piping or the like, and discharges the inert gas G that has circulated through the blower body 11.

  The second gas on-off valve 24 is an on-off valve device that allows the inert gas G flowing through the blower main body 11 to be discharged and stopped.

  The first gas detection means 31 receives, for example, a first detector 32 such as a concentration meter or a pressure gauge and a detection result from the first detector 32, and the first gas on / off valve 23 and the second gas on / off valve 24. It comprises a first controller 33 that performs open / close control.

  Similar to the first gas detection means 31, the second gas detection means 34 receives a detection result from the second detector 35 such as a concentration meter or a pressure gauge and the second detector 35, and receives the first gas on-off valve. 23, and a second controller 36 that performs open / close control of 23.

  Next, with reference to FIG. 2, the procedure of the operation suspension method of the blower 1A of the first embodiment of the present invention will be described.

The operation stop method of the blower 1A is the stop preparation step S1 for stopping the inflow of the atmosphere A from the main inflow passage 12 and the sending of the atmosphere A from the main outflow passage 14, and the inert gas G after the stop preparation step S1. 11 and a gas supply step S2 for supplying and filling the inside.
Furthermore, the inert gas G is sealed in the blower main body 11 according to the result of the first gas detection step S3 for detecting the filling state of the inert gas G in the gas supply step S2 and the first gas detection step S3. Sealing step S4, second gas detection step S5 for detecting the filling state of inert gas G after sealing step S4, and inert gas G in blower body 11 according to the result of second gas detection step S5 And an additional gas supply step S6.

  Here, during the operation of the blower 1A, the first main valve 13 in the main inflow passage 12 and the second main valve 15 in the main outflow passage 14 are opened, and the atmosphere A is sucked into the blower body 11 and externally. Sending to. Further, at this time, the first gas on-off valve 23 in the gas supply path 21 and the second gas on-off valve 24 in the gas discharge path 22 are closed, and the flow of the inert gas G is stopped.

  In such a state, first, the suspension preparation step S1 is executed. That is, the first main valve 13 is closed to stop the inflow of the atmosphere A into the blower body 11, and the second main valve 15 is closed to stop the sending of the atmosphere A to the outside.

  Next, gas supply process S2 is performed. That is, the first gas on-off valve 23 is opened, and the inert gas G is allowed to flow into the blower main body 11 from the cylinder 2 through the gas supply path 21, and the second gas on-off valve 24 is opened to discharge the gas. The inert gas G is discharged through the passage 22 while pushing out the air A remaining in the blower body 11.

  Next, the first gas detection step S3 is performed. That is, the concentration or pressure of the inert gas G by the first detector 32 is equal to or higher than a preset threshold value (concentration or pressure value in a state where the blower body 11 is sufficiently filled with the inert gas G). When this happens, the first controller 33 receives this detection result and commands the first controller 33 to close the first gas on-off valve 23 and the second gas on-off valve 24.

  Next, sealing process S4 is performed. That is, in response to a command from the first controller 33, the first gas on / off valve 23 and the second gas on / off valve 24 are closed, and the blower main body 11 is filled with the inert gas G in the upstream of the blower main body 11. The side and the downstream side are sealed.

  Next, the second gas detection step S5 is performed. That is, the concentration or pressure of the inert gas G filled in the blower body 11 by the second detector 35 is set to a preset threshold value (in a state where the blower body 11 is sufficiently filled with the inert gas G). The second controller 36 receives this detection result and instructs the second controller 36 to open the first gas on-off valve 23.

Next, gas addition process S6 is performed. That is, in response to a command from the second controller 36, the first gas on-off valve 23 is opened, and the inert gas G is additionally supplied into the blower body 11.
After that, when the concentration or pressure of the inert gas G filled in the blower main body 11 is equal to or higher than the preset threshold value by the second detector 35, the command from the second controller 36 is again used. Thus, the first gas on-off valve 23 is closed, and the blower body 11 is sealed.

  In such an operation suspension method for the blower 1A, first, after the inflow of the atmosphere A is stopped in the suspension preparation step S1, the gas supply step S2 and the sealing step S4 are performed to remain in the blower main body 11. While the atmosphere A is pushed out by the inert gas G, the inert gas G is caused to flow into the blower 1A. And it becomes possible to hold | maintain the state with which the inert gas G was filled in the air blower main body 11. FIG.

  Moreover, since sealing process S4 is performed in response to the result of 1st gas detection process S3, the filling amount of the inert gas G does not fall below the said threshold value in the 1st detector 32 set beforehand. Therefore, the blower main body 11 can be sealed in a state where the filling amount is surely a predetermined value.

  In addition, after the sealing step S4, the inert gas G may gradually leak to the outside of the blower body 11 with the passage of time, but the threshold set in advance by the second gas detection step S5 is set. You can avoid falling below. Therefore, the filling amount can always be held at a predetermined value. Therefore, it can be avoided that the atmosphere A containing moisture remains in the blower body 11.

  Further, by using the inert gas G, even if the inert gas G filled in the blower 1A leaks to the outside, there is no danger of ignition and the safety can be ensured. It is.

  According to the operation suspension method of the blower 1A of the present embodiment, the inert gas G can be filled and held in the blower main body 11, and the rust prevention effect can be further improved.

  Note that the inert gas G may be dehumidified between the cylinder 2 and the blower body 11 using, for example, a hygroscopic agent such as silica gel. In this case, the dried inert gas G can be supplied into the blower main body 11, and moisture in the blower main body 11 can be removed more reliably.

Next, the operation stop method of the blower 1B according to the second embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the component similar to 1st embodiment, and detailed description is abbreviate | omitted.
In this embodiment, the gas supply process is different from that of the first embodiment.

  As shown in FIG. 3, the blower 1 </ b> B is provided at a midway position of the circulation flow path 41 that connects the other end 22 b of the gas discharge path 22 and the other end 21 b of the gas supply path 21. And a pump 42. A cylinder opening / closing valve 45 is provided between the other end 21 b of the gas supply path 21 and the cylinder 2.

  The pump 42 has a pump main body 43 and a pump controller 44. The pump controller 44 detects the open / closed state of the second gas on-off valve 24 and operates to drive and stop the pump main body. It is.

  The cylinder open / close valve 45 allows the inert gas G from the cylinder 2 to flow into the gas supply path 21 and can be stopped.

  In the gas supply step S2, the pump main body 43 is driven by the pump controller 44 when the second gas on-off valve 24 is opened. In this way, the inert gas G discharged from the gas discharge path 22 is returned to the gas supply path 21 via the circulation path 41 by the pump 42, and the inert gas G is circulated. Further, at this time, the cylinder opening / closing valve 45 is closed, that is, the inflow of the inert gas G to the gas supply path 21 is stopped.

  In such an operation suspension method of the blower 1B, the inert gas G is circulated in the gas supply process, so that it can be reused. In this case, the cylinder opening / closing valve 45 can be opened to appropriately add the leakage of the inert gas G from the cylinder 2.

  According to the operation stop method of the blower 1B of the present embodiment, the inert gas G can be filled and held in the blower main body 11 to improve the rust prevention effect. Further, for example, the inert gas G is expensive. In the case of a rare gas such as argon, the cost can be reduced by reuse.

  In addition, dehumidification of the inert gas G from the blower main body 11 is performed using a hygroscopic agent such as silica gel at a midway position in any of the circulation flow path 41, the gas supply path 21, and the gas discharge path 22. Also good. In this case, the dried inert gas G can be supplied into the blower body 11 in a state where the inert gas G that has absorbed moisture by passing through the blower body 11 is dehumidified. Therefore, the generation of rust can be avoided more reliably.

  In addition, since the inert gas G absorbs moisture while passing through the inside of the pipe, it is preferable to absorb the moisture at a position as close as possible to the inlet of the blower body 11 so that the inert gas G having a lower humidity is blown. Can be supplied within. Therefore, it is preferable to dehumidify the gas supply path 21 in the middle of the circulation path 41 and the gas discharge path 22.

  Further, the driving and stopping of the pump 42 may be performed manually or the like without using the pump controller 44.

The embodiment of the present invention has been described in detail above, but some design changes can be made without departing from the technical idea of the present invention.
For example, in the above-described embodiment, the first gas detection means 31 used in the first gas detection step S3 is disposed between the second gas on-off valve 24 and the other end 22b of the gas discharge path 22, It is not limited to this position. That is, it may be disposed inside the blower body 11, between the blower body 11 and one end 22 a of the gas discharge path 22, or between one end 22 a of the gas discharge path 22 and the second gas on-off valve 24. .

  Further, the first gas detection means 31 is arranged inside the blower body 11, between the blower body 11 and one end 22 a of the gas discharge path 22, or between the one end 22 a of the gas discharge path 22 and the second gas on-off valve 24. By disposing in between, the first gas detection means 31 may also function as the second gas detection means 34. Thereby, the second gas detection means 34 can be omitted, so that the apparatus can be simplified and the cost can be reduced.

  Further, the second gas detection means 34 used in the second gas detection step S5 is not limited to the arrangement position in the present embodiment. For example, the inside of the blower body 11 or the one end 22a of the gas discharge path 22 and the second gas detection path It may be arranged between the two gas on-off valve 24.

  Further, in the gas supply step S2, when the inert gas G is filled, the blower main body 11 may be unloaded and the inert gas G may be actively sucked and taken into the blowers 1A and 1B. . In this case, the filling speed can be improved.

  Further, the first gas detection step S3 may not necessarily be provided. For example, the sealing step S4 may be manually executed when the filling of the inert gas G into the blower body 11 reaches a predetermined amount. .

  Further, for example, if the leakage amount of the inert gas G is negligible after the sealing step S4, the second gas detection step S5 and the gas addition step S6 may not necessarily be provided, and the inert gas G If there is leakage, the first gas on-off valve 23 may be manually opened and closed, and the inert gas G may be additionally supplied.

  Further, instead of the first main valve 13 and the first gas on-off valve 23, a three-way valve in which these are integrated may be used, or instead of the second main valve 15 and the second gas on-off valve 24. A three-way valve may be used.

DESCRIPTION OF SYMBOLS 1A ... Blower, 2 ... Cylinder, 11 ... Blower main body, 12 ... Main inflow path, 13 ... First main valve, 14 ... Main outflow path, 15 ... Second main valve, 21 ... Gas supply path, 21a ... One end, 21b ... The other end, 22 ... the gas discharge path, 22a ... one end, 22b ... the other end, 23 ... the first gas on-off valve (first on-off means), 24 ... the second gas on-off valve (second on-off means), 31 ... first Gas detection means, 32 ... first detector, 33 ... first controller, 34 ... second gas detection means, 35 ... second detector, 36 ... second controller, G ... inert gas, A ... atmosphere, S1 ... pause preparation step, S2 ... gas supply step, S3 ... first gas detection step, S4 ... sealing step, S5 ... second gas detection step, S6 ... gas addition step, 1B ... blower, 41 ... circulation channel, 42 ... Pump, 43 ... Pump body, 44 ... Pump controller, 45 ... Cylinder open / close valve

Claims (7)

A blower operation suspension method having a blower body that sends out air sucked from the inlet side from the outlet side,
A gas supply step of supplying an inert gas into the blower body;
A blower operation stopping method comprising: a sealing step of sealing the inlet side and the outlet side of the blower body after the inert gas is filled in the blower body.   The said gas supply process supplies the said inert gas in the said air blower main body by performing the no-load operation of the said air blower main body, The operation stop method of the air blower of Claim 1 characterized by the above-mentioned. Between the gas supply step and the sealing step, further comprising a first gas detection step of detecting a filling state of the inert gas in the blower body by a first gas detection means,
The blower operation suspension method according to claim 1 or 2, wherein the sealing step is executed based on a result of the first gas detection step. After the sealing step, a second gas detection step of detecting a filling state of the inert gas in the blower body by a second gas detection means,
The gas addition step of opening and closing the inlet side of the blower main body based on the result of the second gas detection step and performing additional supply of the inert gas is further provided. The blower operation stop method according to any one of the preceding claims.   The gas supply step takes in the inert gas discharged from the outlet side of the blower body from the inlet side, and circulates and supplies the inert gas into the blower body. The blower operation stop method according to claim 4.   The said gas supply process supplies the said inert gas in the said air blower main body, after dehumidifying the said inert gas, The driving | operation of the air blower as described in any one of Claim 1 to 5 characterized by the above-mentioned. Pause method. A blower main body that sends out air sucked from the inlet side from the outlet side;
A gas supply path connected to the inlet side for supplying an inert gas;
First opening and closing means for opening and closing the gas supply path;
A gas discharge path connected to the outlet side for discharging the inert gas;
A blower comprising: second opening / closing means for opening and closing the gas discharge path.

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