JP5323118B2 - Power generation unit - Google Patents

Description

  The present invention provides, for example, a power generation unit such as a thermal power plant that performs a leak inspection (hereinafter referred to as a leak check) of the strainer after opening the strainer disposed in a pipe such as a cooling water circulation system or a bearing cooling water cooling system. About.

  Generally, a thermal power plant is equipped with a boiler that generates steam, a steam turbine that generates power by steam, a condenser that recovers steam generated by the turbine, a generator that converts the power of the turbine into electrical energy, and the like. A plurality of power generation units are combined (not shown).

  The overall schematic configuration of the power generation unit 1 is, for example, as shown in FIG. 3, a cooling water circulation system A having circulation pumps (supply pumps) 3 and 3 for supplying cooling water (seawater) to the condenser 2; The seawater boost pump (supply pump) 5 that branches off from the cold water circulation system A and boosts the cooling water to supply it to the bearing cooling water coolers 4 and 4 and the bearing cooling water when the circulation pumps 3 and 3 are stopped. The first bearing cooling water cooling system B having a seawater pump (supply pump) 6 for supplying cooling water to the coolers 4 and 4, the bearing cooling water coolers 4 and 4, and a plurality of cooling target devices (turbine bearings and the like are lubricated) A second bearing cooling water cooling system C having bearing cooling water pumps 7 and 7 for circulating the cooling water between the oil cooler and the control compressor.

  And since the said electric power generation unit uses seawater as cooling water, the pipe line of each system AC, each pump (supply pump) 3,5,6, and bearing cooling water cooler 4,4 Impurities such as marine products and drifting foreign matter adhere to the channel.

  Therefore, for example, in the first bearing cooling water cooling system B shown in FIG. 3, a pair of branch pipes 8 a connected in parallel as shown in FIG. 4 between the seawater booster pump 5 and the bearing cooling water coolers 4 and 4. 8b, and strainers S1 and S2 for removing the above-described impurities and cleaning the cooling water are arranged in the respective branch pipes 8a and 8b. The strainers S1 and S2 prevent the flow path of the bearing cooling water coolers 4 and 4 from being blocked.

  Each strainer S1, S2 is provided with a differential pressure gauge 16 for measuring a pressure difference between the inlet side and the outlet side of each branch pipe 8a, 8b. For example, one branch pipe (use side pipe body) 8a. When the strainer S1 is clogged due to adhesion of impurities and a differential pressure exceeding a specified value is generated, cooling water is introduced into the other branch pipe (preliminary pipe body) 8b, that is, the cooling is performed. By switching the water supply line from one branch pipe 8a to the other branch pipe 8b, the strainer S1 of one branch pipe 8a is cleaned.

  At this time, the inside of one strainer S1 is cleaned by automatic control. Specifically, the outlet valve 15, the inlet valve 10, the vent valve 11, and the drain valve 14 of the strainer S1 are closed, while the blow valve 13 is opened to supply seawater from another system (not shown) into the strainer S1. Water is passed through and the impurities adhering to the inside of the strainer S1 are discharged to the outside together with the seawater.

  In addition to the internal cleaning by automatic control, the inlet valve 10 and the outlet valve 15 of one strainer S1 are fully closed, and the seawater of the strainer S1 in which the pipe line is blocked is used as the vent valve 11 of the strainer S1 and The drain valve 14 may be opened and removed, and the strainer S1 may be removed from the one branch pipe 8a, and a manhole (not shown) of the strainer S1 may be opened to check the opening (cleaning and cleaning) of the manhole.

  When the open inspection is performed, seawater is passed through one strainer S1, and a leak check of a manhole or the like of the strainer S1 is performed. When the strainer S1 that has been inspected for opening is not used immediately, it is left immersed in seawater or seawater is blown.

  In addition, a power generation unit that has substantially the same configuration as the above-described arrangement configuration of the strainers S1 and S2 and in which substantially the same strainer cleaning is performed is known (for example, see Patent Document 1).

Japanese Utility Model Publication No. 62-59114

  However, in the leak check after the open inspection of the strainer S1, when the strainer S1 is left immersed in seawater, the seawater does not flow and the seawater is accumulated. Accordingly, the growth and reproduction of marine-adherent organisms are promoted inside the strainer S1, and there arises a problem that the strainer S1 is blocked by the marine-adherent organisms grown and propagated before use.

  In addition, when the seawater is blown into the strainer S1 in the leak check after the open inspection of the strainer S1, rust is generated inside the strainer S1 by the blown seawater, and the inside is contaminated by the rust to cause corrosion. There is a problem.

  By the way, it is conceivable that the leak check of the use side strainer S1 is not performed after the open inspection, but the leak check is performed by passing seawater before the use of the spare side strainer S2, but the use side strainer S1 is blocked. The leakage check of the strainer S2 on the standby side may become defective during unsteady switching due to the above, which is not desirable for stable operation of the power generation unit.

  Therefore, the present invention prevents the strainer from being clogged by impurities (growth and breeding marine organisms) generated by the accumulation of cooling water (seawater), and contamination / corrosion of the strainer from rust generated by cooling water. It is an object to provide a power generation unit that can be prevented.

Power generation unit according to the present invention is branched seawater from the cooling water circulating system A for circulating the condenser 2 as cooling water, the piping for supplying the cooling water to the bearings coolant cooling system B of the cooling target equipment, a plurality of strainers S1, S2 are arranged in parallel, in the power generation unit to be used by switching the strainer S1, S2, after overhaul inspection of the strainer S 1 that has been used until now, the strainer S 1 by supplying industrial water A leak check system D for performing a leak check is provided.

In this case, since the strainer S1 that has been used so far is opened and inspected , industrial water is supplied to check the leak of the strainer S1. It becomes possible to prevent the inside of the strainers S1, S2 from being blocked and the contamination / corrosion inside the strainers S1, S2 due to the rust generated by the cooling water.

Further, according to the present invention, the bearing cooling water cooling system B is cooled feed pump 5 for supplying the cooling water to the bearing cooling water cooling system B, the bearing cooling water by the cooling water from the feed pump 5 Bearing cooling water coolers 4 and 4, and a pair of branch pipes 8a and 8b connected in parallel, arranged between the supply pump 5 and the bearing cooling water coolers 4 and 4, and the strainer S1 , S2 may be arranged so as to be arranged in each of the branch pipes 8a, 8b, respectively.

In this case, since the strainers S1 and S2 are arranged in each of the pair of branch pipes 8a and 8b connected in parallel, when one of the strainers S1 and S2 is used, the leak check of the other strainers S2 and S1 is performed. can be performed, to be able to always prepare a strainer S1, S2 ready for use, it is possible to secure a state capable of cooling a bearing of the cooling target device at all times, the power generation unit can be stably operated.

  Further, according to the present invention, the leak check system D has an industrial water source valve 21 that opens and closes a pipeline, and is configured to be cut off downstream from the industrial water source valve 21. 20 may be provided.

  In this case, it is possible to prevent the cooling water passed from the strainers S1 and S2 to the piping of the leak check system D from being mixed into the industrial water. That is, it is possible to prevent adverse effects on industrial water due to impurities in the cooling water.

According to the present invention, after the overhaul inspection of the strainer that has been used until now, because it was Unishi by you leak check of the strainer by supplying industrial water, to prevent clogging of the internal strainer due to impurities of the cooling water And the strainer cleaning cost for removing impurities can be reduced. In addition, contamination and corrosion inside the strainer due to rust generated by impurities can be prevented. Therefore, the reliability of the entire facility can be improved.

The figure which shows the principal part of the electric power generation unit which concerns on one Embodiment of this invention. It is a modification of the power generation unit of FIG. 1, and is a diagram when a leak check system is temporarily installed. The schematic structure figure of the whole electric power generation unit. It is a figure which shows a part of bearing cooling water cooling system in the electric power generation unit of FIG. 3, Comprising: A pair of branch pipe arrange | positioned between a supply pump and a bearing cooling water cooler, and a pair of arrangement | positioning arrange | positioned at each branch pipe The figure which shows the site | part which has a strainer.

  An embodiment of a power generation unit according to the present invention will be described with reference to FIG. In addition, in this embodiment, since the whole structure of the electric power generation unit 1 is the same as FIG. 3, description is abbreviate | omitted. Moreover, as a cooling water, seawater is used and demonstrated about the site | part of the 1st bearing cooling water cooling system B by which strainers S1, S2 are arrange | positioned to a pair of branch pipes 8a, 8b connected in parallel. Further, the internal cleaning of the strainers S1 and S2 by automatic control and the cleaning of the inside of the strainers S1 and S2 by open inspection are performed in the same manner as in the prior art, and the description thereof is also omitted.

  As shown in FIG. 1, the main part of the power generation unit according to the present embodiment is between the seawater booster pump (supply pump) 5 and the bearing cooling water coolers 4 and 4 in the first bearing cooling water cooling system B. A pair of branch pipes 8a and 8b connected in parallel are arranged, and strainers S1 and S2 for removing the above-described impurities and cleaning the cooling water are arranged in each of the branch pipes 8a and 8b.

  Each strainer S1, S2 has an inlet valve 10 arranged on the inflow side above the strainers S1, S2, a vent valve 11 arranged at the upper center of the strainers S1, S2, and an upper part on the outlet side of the strainers S1, S2. A water filling valve 12, a blow valve 13 arranged in the lower part of the inlet side of the strainers S1, S2, a drain valve 14 arranged in the lower center of the strainers S1, S2, and an outlet side of the strainers S1, S2. Between the strainer S1, S2 and the outlet pipe 18 so that the differential pressure between the outlet valve 15 arranged in the outlet pipe 18 connected to the side surface of the pipe and the inlet side and the outlet side of the strainers S1, S2 can be measured. The differential pressure gauge 16 is provided.

  The inlet valve 10 opens together with the outlet valve 15 and passes the cooling water (seawater) from the seawater booster pump 5 from the strainer S1 to the bearing cooling water coolers 4 and 4.

  The vent valve 11 removes, by internal cleaning, marine adhering organisms that have grown and propagated due to impurities accumulated inside the strainers S1 and S2, that is, seawater as cooling water accumulated inside the strainers S1 and S2. Used together with the drain valve 14.

  The water filling valve 12 is connected between the strainers S1 and S2 and an industrial water pipe 20 of the leak check system D described later, and when the strainers S1 and S2 are opened and inspected, the strainers S1 and S2 are checked for leaks. Supply industrial water used in

  When the inside of the strainer S1, S2 is cleaned, the blow valve 13 is opened by automatic control, and the impurities adhering to the inside of the strainer S1, S2 are discharged to the outside together with the seawater passed through the inside of the strainer S1, S2. Yes.

  The differential pressure gauge 16 includes an inlet valve 161, an outlet valve 162, and a pressure equalizing valve 163, and measures a differential pressure between the inlet side and the outlet side of the strainers S1 and S2. For example, when the above-mentioned impurities are clogged in the strainer S1 of one branch pipe (use-side pipe body) 8a and a differential pressure exceeding a specified value occurs, the other branch pipe (preliminary pipe) The cooling water is introduced into the side pipe body 8b, that is, the cooling water supply pipe is switched from one branch pipe 8a to the other branch pipe 8b, and the strainer S1 of one branch pipe 8a is cleaned. I am doing so.

  The leak check system D includes a main pipe 20a on which an industrial water source valve 21 is arranged, branch pipes 20b and 20b having water filling valves 12 and 12 arranged on a pair of strainers S1 and S2, and the branch pipes 20b, An industrial water pipe 20 composed of a connection pipe 22 connected between 20b and the main pipe 20a is provided. That is, the industrial water pipe 20 is configured so that it can be divided downstream of the industrial water source valve 21. The reason for this is that the cooling water flowing from the strainer S1 through the water filling valve 12 into the main pipe 20a of the industrial water pipe 20 can be prevented from being mixed into the industrial water. In other words, it is possible to prevent adverse effects on industrial water caused by cooling water impurities (growth and breeding marine organisms).

  Next, a procedure for performing a leak check will be described. After the opening inspection, the inlet valve 10, blow valve 13 and outlet valve 15 of the strainer S1 through which cooling water is passed (hereinafter referred to as the use side strainer) are fully closed, the drain valve 14 and the vent valve 11 are fully opened, and the differential pressure gauge The 16 inlet valves 161 and the outlet valve 162 are fully closed, and the pressure equalizing valve 163 of the differential pressure gauge 16 is fully opened.

  Next, the fully open drain valve 14 is fully closed, the vent valve 11 is fully opened, and the water filling valve 12 is fully closed. Thereafter, the fully closed industrial water source valve 21 is fully opened, and the fully closed water filling valve 12 is fully opened. At this time, since the pressure of the industrial water pipe 20 of the leak check system D is 0.7 MPa, the opening operation is gradually performed.

  Then, after confirming the outflow of industrial water from the vent valve 11 of the strainer S1, the water filling valve 12 is once fully closed, and then the strainer S1 vent valve is fully opened in order to prevent damage to the equipment due to pressure increase. 11 is fully closed.

  Next, the fully-closed water filling valve 12 is opened to adjust the pressure. Specifically, since the pressure of the industrial water pipe 20 of the leak check system D is 0.7 MPa as described above, the pressure is adjusted to 0.2 MPa so as not to exceed the maximum working pressure of 0.42 MPa. .

  Finally, the water filling valve 12 opened to adjust the pressure is fully closed, the supply of industrial water is stopped, and it is confirmed that there is no leakage in the strainer S1.

  As described above, the power generation unit 1 according to the present embodiment supplies the industrial water to the strainer S1 to check for leaks, so that the cooling water (seawater) does not accumulate in the strainer S1, It becomes possible to prevent the inside of the strainer S1 from being blocked by the propagated marine adhering organisms, and the contamination and corrosion inside the strainer S1 from the rust generated by the cooling water (seawater).

  In addition, the electric power generation unit which concerns on this invention can be variously changed without being limited to the said embodiment.

  For example, in the above embodiment, the leak check system D is permanently installed, but it may be installed only when performing a leak check. For example, as shown in FIG. 2, a main pipe 30a in which an industrial water source valve 21 is arranged, a branch connection to the main pipe 30a, a temporary valve 31, and a temporary pressure gauge 32 are arranged downstream thereof. The temporary pipe 30 configured by the pair of branch pipes 30b and 30b may be detachably connected to the water-filled seats 12 and 12 of the strainers S1 and S2.

  Moreover, in the case of the said embodiment, although the leak check system | strain D was arrange | positioned in the bearing cooling water cooling system B, you may make it arrange | position in the cooling water circulation system A. Specifically, in the cooling water circulation system A shown in FIG. 3, a parallel arrangement that is arranged between the condenser 2 and a condensate pump (not shown) arranged on the outlet side of the condenser 2. The leak check system D may be arranged at a portion including a pair of connected branch pipes 8a and 8b and strainers S1 and S2 arranged in the branch pipes 8a and 8b.

DESCRIPTION OF SYMBOLS 1 ... Power generation unit, 2 ... Condenser, 4 ... Bearing cooling water cooler, 5 ... Supply pump (seawater pressurization pump), 8a, 8b ... Branch pipe, 20 ... Industrial water piping, 21 ... Industrial water source valve, 30 ... Temporary piping, 31 ... Temporary valve, 32 ... Temporary pressure gauge, A ... Cooling water circulation system, B ... Bearing cooling water cooling system, D ... Leak check system, S1, S2 ... Strainer

Claims (3)

It is branched seawater from the cooling water circulation system for circulating the condenser (2) as a coolant (A), the pipe for supplying the cooling water to the bearings coolant cooling system of the cooling target equipment (B), a plurality of In the power generation unit in which the strainers (S1, S2) are arranged in parallel and the strainers (S1, S2) are switched and used ,
After overhaul inspection of strainer was used (S 1) ever power generation unit supplies industrial water characterized by comprising a leak check system (D) for a leak check of the strainer (S 1) . Said bearing cooling water cooling system (B) is cooled supply pump for supplying the cooling water to the bearing cooling water cooling system (B) (5), the bearing cooling water by the cooling water from the feed pump (5) And a pair of branch pipes (8a, 8b) connected in parallel and arranged between the supply pump (5) and the bearing cooling water cooler (4, 4). has the door, said strainer (S1, S2), the power generation unit according to claim 1, characterized in that respectively disposed on respective branch pipes (8a, 8b).   The leak check system (D) has an industrial water source valve (21) that opens and closes a pipe, and is configured to be cut off downstream from the industrial water source valve (21). The power generation unit according to claim 1, further comprising:

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