TWI416541B - Pipe-passivating alkali-injecting device for a nuclear plant - Google Patents

Abstract

A nuclear plant is provided with a pipe-passivating alkali-injecting device including an alkali-injecting tank, an actuator, a counter-balance valve, a pressure gauge, exhaust valves and switching valves. The actuator is connected to the alkali-injecting tank via a first pipe. The counter-balance valve is connected to the actuator via a second pipe and connected to the alkali-injecting tank via a third pipe. The pressure gauge is provided between the actuator and the counter-balance valve and connected to the second pipe. The exhaust valves are connected to the first and second pipes, and so are the switching valves. The alkali-injecting tank, the actuator and the counter-balance valve are used together to expel gases from the pipes while injecting alkali, thus effectively avoiding feedback of liquid in the nuclear plant, transmitting pure alkali in the pipes, and reducing damages of the pipes?

Description

Nuclear power plant pipeline passivation alkali injection device

The invention relates to a pipeline passivation alkali injection device for a nuclear power plant, in particular to a front end of a power plant, which can be used with an alkali injection tank, an actuating unit and a back pressure valve, and each tube is used for alkali injection. The gas in the body is eliminated, and the feedback of the power plant liquid is effectively prevented, so that the pure lye can be obtained in each tube body, and the effect of slowing down the damage of each tube body can be achieved.

Generally, when the nuclear power plant pipeline is passivated, the lye contained in the alkali injection container is directly injected into the pipeline of the nuclear power plant, and the gas in the pipeline is removed by the exhaust valve.

In the conventional injection method, although the exhaust valve removes the gas in the pipeline, there is still gas residue in the pipeline, and since the alkali injection is mainly used before the power plant is pumped, there is no gas to enter. In the pipeline, once there is gas in the pipeline, the voltage pump will be idling. This will not only reduce the service life of the power plant pump, but also increase the maintenance cost. There are security concerns.

The main object of the present invention is that it can be used at the front end of the power plant, and the use of the alkali injection tank, the actuating unit and the back pressure valve can be utilized, and the gas in each tube body is eliminated during the alkali injection, and the power plant is effectively prevented. The feedback of the liquid can make the pure lye in each tube body, and the effect of slowing down the damage of each tube body can be achieved.

In order to achieve the above object, the present invention is a nuclear power plant pipeline passivation alkali injection device, which comprises an alkali injection tank containing an appropriate amount of alkali liquid; an actuation unit connected by a first pipe body and an alkali injection tank, The second unit body is connected to the moving unit; a back pressure valve is disposed on one side of the actuating unit and communicates with the second tube body, and the third tube body is connected between the back pressure valve and the alkali injection tank. a pressure gauge disposed between the actuation unit and the back pressure valve and in communication with the second tubular body; a plurality of exhaust valves respectively connected to the first and second tubular bodies; and a plurality of respectively connected to the first And an on-off valve on the second pipe body.

In an embodiment of the invention, the first tube system comprises a straight tube and a horizontal tube, such that the first tube body is slightly L-shaped, and the horizontal tube tube is inclined by 30° toward the direction of the actuation unit.

In an embodiment of the invention, the actuation unit is a reciprocating pump.

In an embodiment of the invention, the second tube system is inclined by 30° toward the direction of the actuation unit, and the second tube body has a tapered tube connected to the power plant at one end.

In an embodiment of the invention, a pressure relief valve and a check valve connected to the second pipe body are disposed between the actuating unit and the back pressure valve.

Please refer to FIG. 1 for a schematic diagram of the basic architecture of the present invention. As shown in the figure: the present invention is a nuclear power plant pipeline passivation alkali injection device, which is at least composed of an alkali injection tank 1, an actuating unit 2, a back pressure valve 3, a pressure gauge 4, a plurality of exhaust valves 5, and Most of the on-off valves 6 are constructed.

The above-mentioned alkali injection tank 1 is filled with an appropriate amount of alkali liquor.

The actuating unit 2 can be a reciprocating pump, and the actuating unit 2 is connected to the alkali injection tank 1 by the first pipe body 21, and can be disposed below, above, and in front of the alkali injection tank 1 according to actual needs. In the present invention, the present embodiment is provided below the injection tank 1 as an embodiment, and the actuation unit 2 is connected to the second tube body 22, wherein the first tube body 21 includes a straight tube. 211 and a horizontal tube 212, the first tube body 21 is slightly L-shaped, and the horizontal tube 212 is inclined by 30° toward the direction of the actuation unit 2, and the second tube body 22 is directed toward the actuation unit 2 The direction is inclined by 30°, and the second tubular body 22 has a tapered tube 221 connected to the power plant pump 7 at one end.

The back pressure valve 3 is disposed on one side of the actuating unit 2 and communicates with the second pipe body 22, and the third pipe body 31 is provided in communication between the back pressure valve 3 and the alkali injection tank 1 and is actuated thereon. A pressure relief valve 32 and a check valve 33 that communicate with the second pipe body 22 are disposed between the unit 2 and the back pressure valve 3.

The pressure gauge 4 is disposed between the actuation unit 2 and the back pressure valve 3 and is in communication with the second tubular body 22.

Each of the exhaust valves 5 is connected to the first and second tubes 21 and 22, respectively.

Each of the on-off valves 6 is connected to the first and second tube bodies 21 and 22, respectively. If so, a new nuclear power plant pipeline passivation alkali injection device is constructed by the above structure.

When the present invention is applied, the on-off valve 6 provided on the first pipe body 21 is opened, and the alkali liquid is output from the alkali injection tank 1 in the first pipe body 21, and is transferred to the actuating unit 2 by gravity. And the actuating unit 2 is used to push the alkali liquid forward in the second pipe body 22 (at this time, the on-off valve 6 on the second pipe body 22 is closed), and the gas generated when pushing the alkali liquid is used by the back pressure valve. 3 is transferred to the alkali injection tank 1 and is circulated several times until there is no gas in the first and second tube bodies 21, 22, and the backflow valve 33 is used to prevent the lye from flowing back to the actuating unit 2, and then the first step is turned on. The on-off valve 6 on the second pipe body 22 causes the lye to be transported from the second pipe body 22 through the reducer pipe 221 to the power plant pump 7; and since the cross pipe 212 of the first pipe body 21 is actuated The direction of the unit 2 is inclined by 30°, and the second tube 22 is inclined by 30° in the direction of the actuating unit 2, so that the gas in the lye can be moved upward without accumulating in the tube body, and In the transmission process of the inspection, in addition to the discharge of the exhaust valve 5 for gas discharge, the pressure gauge 4 can be inspected at any time, and the pressure relief valve 32 is used when the pressure is abnormal. Pressure relief, in addition, when the transfer pressure of the lye is too large and greater than the power plant pressure, the back pressure valve 3 is opened, so that the gas is transferred to the alkali injection tank 1, so that the feedback of the power plant liquid can be effectively prevented, so that each tube body can be A relatively pure lye is obtained, and an oxide film is formed in each tube body, thereby achieving the effect of slowing down the damage of each tube body.

In summary, the pipeline passivation and alkali injection device of the nuclear power plant of the invention can effectively improve various disadvantages of the conventional use, and can be used at the front end of the power plant, and can cooperate with the injection tank, the actuating unit and the back pressure valve, and When the alkali is used, the gas in each tube body is eliminated, and the feedback of the power plant liquid is effectively prevented, so that the pure alkali liquid can be obtained in each tube body, thereby achieving the effect of slowing down the damage of each tube body; thereby further producing the present invention. Progress, more practical, and more in line with the needs of consumers, it has indeed met the requirements of the invention patent application, and filed a patent application according to law.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the invention are modified. All should remain within the scope of the invention patent.

1. . . Alkaline tank

2. . . Actuating unit

twenty one. . . First tube

211. . . Straight

212. . . Cross tube

twenty two. . . Second tube

221. . . Reducer

3. . . Back pressure valve

31. . . Third tube

32. . . Pressure relief valve

33. . . Check valve

4. . . Pressure gauge

5. . . Vent

6. . . Switch valve

7. . . Power plant pump

Figure 1 is a schematic diagram of the basic architecture of the present invention.

1. . . Alkaline tank

2. . . Actuating unit

twenty one. . . First tube

211. . . Straight

212. . . Cross tube

twenty two. . . Second tube

221. . . Reducer

3. . . Back pressure valve

31. . . Third tube

32. . . Pressure relief valve

33. . . Check valve

4. . . Pressure gauge

5. . . Vent

6. . . Switch valve

7. . . Power plant pump

Claims (5)

A pipeline passivation alkali injection device for a nuclear power plant, comprising: an alkali injection tank containing an appropriate amount of alkali liquid; and an actuating unit, wherein the first pipe body is connected with the alkali injection tank, and the actuating unit is attached Connected with a second pipe body; a back pressure valve is disposed on one side of the actuating unit and communicates with the second pipe body, and a third pipe body is connected between the back pressure valve and the alkali injection tank; The watch is disposed between the actuating unit and the back pressure valve and is in communication with the second pipe body; a plurality of exhaust valves are respectively connected to the first and second pipe bodies; and a plurality of switch valves are respectively connected On the first and second tubes. The nuclear power plant pipeline passivation alkali injection device according to claim 1, wherein the first pipe system comprises a straight pipe and a horizontal pipe, so that the first pipe body is slightly L-shaped, and the horizontal pipe The pipe system is inclined 30° in the direction of the actuating unit. The nuclear power plant pipeline passivation alkali injection device according to claim 1, wherein the actuation unit is a reciprocating pump. According to the scope of claim 1, the nuclear power plant pipeline passivation alkali injection device, wherein the second pipe system is inclined by 30° in the direction of the actuating unit, and the second pipe body has a connection with the power plant at one end. Shrink tube. The nuclear power plant pipeline passivation alkali injection device according to the first aspect of the patent application, wherein a pressure relief valve and a check valve connected to the second pipe body are disposed between the actuating unit and the back pressure valve.