JP2015020086A - Floating oil recovery facility in power plant, and floating oil recovery method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a facility for efficiently recovering the floating oil in a drainage pit at a suppressed recovery cost.SOLUTION: The facility includes: a conduit 2 in which the exhaust gas from a generator 111 is led to the side of a drainage pit 101; a blowout duct 3 disposed at the end of the conduit 2 on the side of the drainage pit 101, through which the exhaust gas is blown out such that floating oil H is gathered to a predetermined position in the drainage pit 101; and an oil recovery device 4 disposed at a predetermined position in the drainage pit 101, which takes out the gathered floating oil H.

Description

  The present invention relates to a floating oil recovery facility and a floating oil recovery method for a power plant that recovers oil floating and floating on the water surface of a drain pit of the power plant.

  For example, hydraulic power plants use oil for operating various equipment and lubricating oil (turbine oil), and water leaks from power plant buildings and water turbines contain some oil. Yes. Thus, the water leakage including oil is temporarily stored in a drainage pit located at the lowest position of the power plant building, separated into oil and water, and then discharged outside the building. In other words, oil that floats on the surface of the drain pit (floating oil) is separated and recovered by a belt-type oil-water separator, or pumped by a surface intake pump equipped with a float and filtered by an oil adsorption filter. ing.

  On the other hand, an oil recovery device is known in which a propeller disposed in water is rotated to forcibly generate a water flow, and the oil on the water surface is scooped up by a brush conveyor while drawing oil from the surrounding water surface region (for example, , See Patent Document 1).

Japanese Patent Application Laid-Open No. 09-075933

  By the way, the floating oil is not gathered on the water surface of the drainage pit, but diffuses and floats at various points. Therefore, a large amount of water acts and flows into the belt-type oil-water separator and the oil adsorption filter together with the oil. For this reason, efficient oil-water separation becomes difficult. Moreover, even if the oil recovery apparatus of patent document 1 is used, only the oil around the apparatus can be drawn. For this reason, in order to collect all floating oil floating in a drainage pit with a wide water surface or a drainage pit in which a long channel is formed by a weir, multiple oil recovery devices or oil The collection device must be moved, which requires a great deal of cost and labor. In addition, it requires power for rotating the propeller, which further increases the cost.

  Accordingly, the present invention provides a floating oil recovery facility and a floating oil recovery method for a power plant that can efficiently recover floating oil in a drain pit and that can reduce recovery costs. With the goal.

  In order to solve the above problems, the invention of claim 1 is a floating oil recovery facility for a power plant that collects floating oil that is oil floating on the water surface of a drain pit of the power plant. A conduit for guiding the exhaust gas to the drain pit side, and a blowing means provided at an end portion of the conduit on the drain pit side, blowing out the exhaust gas and collecting the floating oil at a predetermined position in the drain pit, And a take-out means for taking out the collected floating oil provided at the predetermined position in the drain pit.

  According to this invention, the exhaust from the generator is led to the drain pit side through the conduit, the exhaust is blown out from the blowing means, and the floating oil is gathered to a predetermined position in the drain pit, and the gathered floating Oil is removed by the removal means.

  According to a second aspect of the present invention, in the floating oil recovery facility for a power plant according to the first aspect of the present invention, it is provided with a flow rate control means for controlling a blow amount from the blow means to a predetermined amount.

  According to a third aspect of the present invention, in the floating oil recovery facility for a power plant according to the first or second aspect, there is provided a backflow prevention means for preventing air from flowing from the drain pit side to the generator side via the conduit. It is characterized by comprising.

  The invention of claim 4 is a method for recovering floating oil of a power plant that collects floating oil that is floating on the water surface of a drain pit of the power plant, and guides exhaust from the generator to the drain pit side. The exhaust gas is blown out to collect the floating oil at a predetermined position in the drainage pit, and the floating oil collected at the predetermined position is taken out.

  According to the first and fourth aspects of the present invention, the floating oil is gathered to a predetermined position in the drain pit by the air flow from which the exhaust is blown, and then the floating oil is taken out. Therefore, the floating oil in the drain pit is efficiently recovered. It becomes possible to do. That is, since floating oil is taken out in a collective state, it can be efficiently collected and removed by a belt-type oil / water separator, an oil adsorption filter, or the like (extraction means).

  Even in a drainage pit with a wide water surface or a drainage pit where a long channel is formed by a weir, multiple facilities / devices are arranged or moved in order to collect floating oil at a predetermined position by the airflow of the exhaust. It is possible to reduce the equipment cost and the recovery cost. Furthermore, since the exhaust from the generator is used, power for generating an air flow (collecting floating oil) is unnecessary, and the recovery cost can be further suppressed.

  According to the second aspect of the present invention, since the amount of exhaust gas discharged from the blowing means is controlled to a predetermined amount, the floating oil can be collected in a predetermined position in a good and appropriate manner, and the floating oil can be collected more efficiently. Is possible.

  According to the invention of claim 3, since air is prevented from flowing from the drain pit side to the generator side via the conduit, the operation and function of the generator can be performed by flowing high-humidity air to the generator side. It is possible to prevent the influence from occurring.

It is a figure which shows the arrangement | positioning state of the floating oil collection | recovery equipment of the power plant which concerns on embodiment of this invention. It is a top view which shows the arrangement | positioning state of the blowing duct and oil collection | recovery apparatus of the floating oil collection | recovery installation of FIG. It is a sectional side view which shows the arrangement | positioning state of the blowing duct of the floating oil collection | recovery equipment of FIG. It is a top view which shows the state which applied the floating oil collection | recovery equipment of FIG. 1 to another drainage pit.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a diagram showing an arrangement state of a floating oil recovery facility (hereinafter referred to as “floating oil recovery facility”) 1 of a power plant according to an embodiment of the present invention. This is a facility for collecting floating oil, which is oil floating on the surface of the drain pit 101 in the power plant.

  Here, in this embodiment, the case where the power plant is a hydroelectric power plant will be described, and various oils such as oil for operating various devices and lubricating oil (turbine oil) will be used. Some water is contained in the water leakage from the water wheel 102 or the like. And the water leak containing oil is once stored by the drainage pit 101 located in the basement floor (lowest level) of a power plant building.

  That is, the pressure oil tank 103 installed on the upper floor and the oil tank 104 installed on the basement floor are connected via the oil feed pipes 105 and 106. A pressure oil pump 107 and a pump motor 108 are disposed in these oil feed pipes 105 and 106, respectively, so that oil circulates between the pressure oil tank 103 and the oil tank 104. On the upper floor, an oil breakwater 109 is installed so as to surround the pressure oil tank 103, the pressure oil pump 107, and the pump motor 108.

  On the other hand, a pool-shaped drainage pit 101 is provided at a position lower than the floor surface 110 on the basement floor. The oil leaked from the oil tank 104 and the like and the water leaked from the water wheel 102 and the like flow through the floor surface 110 of the basement floor and flow into the drain pit 101 to be stored.

  Further, the water turbine 102 is installed on the basement floor, connected to the generator 111 installed on the upper floor, and the power generator 111 generates power when the water turbine 102 rotates. At this time, the rotor in the generator 111 rotates, so that air from outside is sucked into the generator 111 and further exhausted out of the generator 111. The exhaust is high-temperature dry air and is exhausted outside the building through the exhaust duct 112. Here, broken-line arrows in the figure indicate such air / exhaust flows.

  A floating oil recovery facility 1 is disposed in such a hydroelectric power generation facility. The floating oil recovery facility 1 mainly includes a conduit 2, a blowout duct (blowing means) 3, and an oil recovery device (takeout means) 4. And.

  The conduit 2 is a vent pipe that guides exhaust / air from the generator 111 to the drain pit 101 side. That is, the upstream end 2a is positioned in the exhaust duct 112, the downstream end 2b is positioned directly above the drainage pit 101, and the opening of the upstream end 2a is It is arranged to face the flow of exhaust from the generator 111. Thereby, a part of the exhaust from the generator 111 flows through the conduit 2 to the drain pit 101 side.

  The blowout duct 3 is a blowout opening provided at the end 2 b of the conduit 2 on the side of the drainage pit 101 and blowing out exhaust gas and collecting the floating oil H at a predetermined position in the drainage pit 101. Here, first, the drain pit 101 will be described. As shown in FIGS. 2 and 3, the drain pit 101 has a rectangular planar shape. In this embodiment, the drain pit 101 extends in the longitudinal direction to partition the drain pit 101. A first weir 121 and a second weir 122 are provided. Accordingly, the first accommodation space 101a sandwiched between the first weir 121 and the side surface facing the first weir 121, and the second accommodation space 101b sandwiched between the first weir 121 and the second weir 122 A third accommodation space 101c sandwiched between the second weir 122 and the side surface facing the second weir 122 is formed.

  A gap is provided between the lower end portion of the first weir 121 and the bottom surface of the drainage pit 101, and lower water (water not containing oil) in the first accommodation space 101a is supplied from the gap to the second accommodation. The water flows into the space 101b, and the water in the second storage space 101b overflows from the upper end of the second weir 122 and flows into the third storage space 101c. A drainage pump 130 is disposed on one end side in the longitudinal direction of the third accommodation space 101c, and water in the third accommodation space 101c is pumped up by the drainage pump 130 and is discharged outside the building through the drainage pipe 131. It is supposed to be discharged. Further, the upper surface of the drainage pit 101 is covered with a pit lid 123 except for a later-described blowout duct 3 side (the other end side in the longitudinal direction) of the first accommodation space 101a, and water is discharged from the opening on the blowout duct 3 side. And oil flows in.

  The oil recovery device 4 is disposed on one end side (predetermined position) in the longitudinal direction of the first accommodation space 101a of the drain pit 101, and the blowing duct 3 is disposed on the other end side.

  The blowing duct 3 has a substantially box shape, and an opening 3a is formed so as to blow out exhaust gas from the lower surface toward the water surface obliquely forward (on the oil recovery device 4 side). Moreover, the length of the width | variety of the blowing duct 3 is set to the substantially same length as the width | variety of the 1st accommodating space 101a, and exhaust_gas | exhaustion is blown off over the full width direction of the 1st accommodating space 101a. By exhausting the exhaust gas in this way, the entire water surface in the first accommodation space 101a flows from the blowing duct 3 side to the oil recovery device 4 side (a wave is formed), and the inside of the first accommodation space 101a. All the floating oil H that has diffused and floated on the surface of the water is gathered to the oil recovery device 4 side.

  Here, the exhaust amount blown out from the blow-out duct 3 is adjusted by an air volume adjusting valve 5 described later so that all the floating oil H is gathered to the oil recovery device 4 side properly and appropriately. Further, a plurality of guide vanes are disposed in the blow-out duct 3, and the exhaust is blown out in a predetermined / desired direction guided by the guide vanes.

  As described above, the oil recovery device 4 is disposed on one end side in the first accommodating space 101a of the drain pit 101, and removes (removes) the floating oil H collected on this end side. It is. Specifically, a belt-type oil / water separator that collects and collects oil on a rotating belt, an oil adsorption filter that is pumped up by a surface intake pump equipped with a float and filtered through an oil adsorption filter, or a floating oil H It consists of off-the-shelf and existing equipment, such as a floating oil recovery pump that pumps the oil directly with a pump. Then, the floating oil H taken out by the oil recovery device 4 is temporarily stored in the oil tank and conveyed outside the building.

  The conduit 2 is provided with an air volume adjusting valve (flow rate control means) 5 and a check valve (backflow prevention means) 6. The air volume adjusting valve 5 is a valve that controls the amount of blown air from the blowout duct 3 to a predetermined amount. That is, it is a valve that controls the amount of exhaust sent to the blowout duct 3 side. In this embodiment, a constant flow rate is always maintained even if the amount of exhaust flowing into the conduit 2 from the generator 111 side increases or fluctuates. 3 is blown out. Here, the constant flow rate is a flow rate at which the floating oil H is gathered well and properly by blowing the exhaust gas.

  The check valve 6 is a check valve that prevents air from flowing from the drain pit 101 side to the generator 111 side via the conduit 2. That is, the check valve 6 allows air (exhaust gas) to flow only from the generator 111 side to the drain pit 101 side through the conduit 2. Therefore, even when the generator 111 is stopped and the flow of exhaust from the generator 111 ceases, high-humidity air on the drain pit 101 side does not flow to the generator 111 side.

  Next, the operation of the floating oil recovery facility 1 having such a configuration, the method of recovering the floating oil of the power plant by the floating oil recovery facility 1, and the like will be described.

  First, when the generator 111 is operated, the exhaust from the generator 111 is guided to the drain pit 101 (blowing duct 3) side through the exhaust duct 112 and the conduit 2. On the other hand, the oil leaked from the oil tank 104 or the like, or the water leaked from the water wheel 102 or the like flows through the floor surface 110 of the basement floor and flows into the first accommodation space 101a from the discharge duct 3 side of the drainage pit 101. The oil becomes floating oil H and diffuses and floats on the water surface.

  In such a state, the exhaust gas flowing through the conduit 2 is blown toward the water surface by the blowing duct 3, and the floating oil H that has been diffused as described above is recovered in the oil in the first accommodation space 101a. Collected on the 4th side. The collected floating oil H is taken out by the oil recovery device 4.

  As described above, according to the floating oil recovery facility 1 and the floating oil recovery method of the power plant, the floating oil H is gathered in one place in the drainage pit 101 by the airflow from which the exhaust is blown, and then the floating oil is collected. Since H is taken out by the oil recovery device 4, the floating oil H in the drain pit 101 can be efficiently recovered. That is, since the floating oil H is taken out in a collective state, it can be efficiently recovered and removed by the oil recovery device 4 such as a belt-type oil-water separator or an oil adsorption filter device. As a result, the belt-type oil-water separator It is possible to shorten the drive time of the battery and to reduce the replacement frequency by using the filter effectively and efficiently.

  Furthermore, even if the amount of exhaust from the generator 111 side fluctuates, a constant flow rate is always blown out from the blowing duct 3, so that the floating oil H is always gathered to the oil recovery device 4 side in a good and appropriate manner. It becomes possible to collect the floating oil H efficiently.

  Even in the drainage pit 101 where the water surface is wide, since the floating oil H is gathered in one place by the exhaust airflow, there is no need to arrange or move multiple oil recovery devices 4, and the equipment cost and recovery Costs can be suppressed. Furthermore, since the exhaust from the generator 111 is used, power for generating an air flow (collecting the floating oil H) is unnecessary, and the recovery cost can be further suppressed.

  On the other hand, since air does not flow backward from the drain pit 101 side to the generator 111 side via the conduit 2, the operation and function of the generator 111 are affected by the flow of high humidity air to the generator 111 side. Can be prevented. Further, although the humidity on the drain pit 101 side is high, moisture and condensation around the drain pit 101 can be prevented / suppressed by sending the dried exhaust gas from the generator 111 to the drain pit 101 side.

  Furthermore, the present floating oil recovery facility 1 can be easily configured or the present floating oil recovery method can be implemented simply by providing the existing hydroelectric power generation facility with the conduit 2 and the blowout duct 3. Further, since the floating oil H is gathered by the exhaust flow, there is no contamination by oil and no inspection or cleaning is required compared to the case where the floating oil H is gathered by a scraping member / tool (such as a handle).

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, a constant exhaust amount is always blown out from the blowing duct 3, but the blowing amount is adjusted according to the amount of floating oil H, the diffusion state, etc. The amount of blowout may be adjusted according to the collection capability and collection status of the apparatus 4. For example, the amount of floating oil H in the drain pit 101 and the diffusion state may be constantly monitored, and the amount of blowout may be increased when the amount of floating oil H is large or when the diffusion is wide. Alternatively, when the oil recovery device 4 is composed of an oil adsorption filter device, the amount of blowout may be reduced or reduced to zero when the filter is replaced so that the floating oil H is not collected.

  In the above-described embodiment, the blowout duct 3 and the oil recovery device 4 are disposed to face each other. However, as shown in FIG. 4, a plurality of weirs 141 and 142 are provided in the first accommodation space 101a. When a long flow path is formed, the blowing duct 3 may be disposed on the upstream side of the flow path, and the oil recovery device 4 may be disposed on the downstream side. Here, such a long flow path is formed by increasing the distance and time so that the floating oil H is supplied to the oil recovery device 4 so as to match the recovery speed of the oil recovery device 4 (when the recovery speed is low). To send to.

  Further, a plurality of blowout ducts 3 may be provided according to the size of the drainage pit 101 or the like. Of course, the present invention can be applied not only to hydroelectric power plants but also to other power plants such as thermal power plants.

1 Floating oil recovery equipment at power plant 2 Conduit 3 Blowout duct (Blowout means)
4 Oil recovery device (removal means)
5 Air flow adjustment valve (flow control means)
6 Check valve (back flow prevention means)
101 Drainage pit 111 Generator H Floating oil

Claims (4)

A floating oil recovery facility for a power plant that collects floating oil, which is oil floating on the surface of the drain pit of the power plant,
A conduit for guiding exhaust from the generator to the drain pit side;
Blowing means provided at an end of the conduit on the drain pit side, blowing out the exhaust and collecting the floating oil at a predetermined position in the drain pit;
A take-out means that is provided at the predetermined position in the drain pit and takes out the collected floating oil,
A floating oil recovery facility for a power plant, comprising: A flow rate control means for controlling the amount of blowout from the blowout means to a predetermined amount;
The floating oil recovery equipment for a power plant according to claim 1. Comprising backflow prevention means for preventing air from flowing from the drain pit side to the generator side via the conduit;
The floating oil recovery facility for a power plant according to any one of claims 1 and 2. A method for recovering floating oil in a power plant that collects floating oil, which is oil floating on the surface of a drain pit of a power plant,
The exhaust from the generator is guided to the drain pit side, the exhaust is blown out, the floating oil is gathered at a predetermined position in the drain pit, and the floating oil gathered at the predetermined position is taken out. Floating oil recovery method for the power plant.

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