TWM638749U - Steam turbine oil pump system - Google Patents

Abstract

A steam turbine lubricating oil pump system includes a first oil pump, a turbine unit, a steam trip valve, a lubricating oil tank, a second oil pump and a three-way solenoid valve. The turbine unit is used to drive the main shaft according to the steam to drive the first oil pump to provide the lubricating oil in the first oil tank to the blower unit. The steam trip valve is used to control the amount of steam according to the oil pressure, and has a first oil inlet port and a first oil outlet port. The lubricating oil tank has a second oil inlet port. The second oil pump is used for driving according to the main shaft to provide lubricating oil in the lubricating oil tank to the steam trip valve, and has a second oil outlet. The three-way solenoid valve has a first end, a second end and a third end. The first oil tank is connected to the first end through the first pipeline, the second oil outlet is connected to the second end and the first oil inlet through the second pipeline, and the second oil inlet is connected to the third end through the third pipeline.

Description

Steam turbine oil pump system

The present invention relates to a steam turbine lubricating oil pump system, in particular to a steam turbine lubricating oil pump system which prevents a steam tripping valve from tripping.

The single-stage steam turbine lubricating oil pump system is used as an emergency standby unit to provide lubricating oil and corresponding oil pressure to the blower unit. When the oil pressure of the blower unit is lower than the set value, the single-stage steam turbine lubricating oil pump system can start immediately to provide sufficient oil pressure to the blower unit, otherwise the blower unit will not have enough oil to lubricate the shaft and bearing at high speed , easily lead to damage to the unit.

Please refer to FIG. 1 , which is a schematic diagram of a conventional single-stage steam turbine lubricating oil pump system 100 . The single-stage steam turbine lubricating oil pump system 100 includes a turbo unit 120 , a steam control valve 130 , a steam trip valve 140 , a main oil pump 150 , a speed regulating oil pump 160 and a lubricating oil tank 170 . The main oil pump 150 is connected to the main oil tank 180 . Turbomachine 120 may include an inlet port 121 , turbine blades 123 and a main shaft 125 . An inlet port 121 of the turbomachine 120 is connected to a steam source 110 via a steam control valve 130 to receive steam AS from the steam source 110 . The main shaft 125 of the turbo unit 120 is connected to the main oil pump 150 . When the turbine unit 120 receives the steam AS from the inlet port 121, it can drive the turbine blades 123 to rotate according to the amount of steam, and then drive the main shaft 125 to drive the main oil pump 150 to supply the lubricating oil in the main oil tank 180 to the blower unit (not shown in the figure) .

The steam control valve 130 and the steam trip valve 140 can be used to control the amount of steam entering the inlet port 121 of the turbomachine 120 to control the speed of the turbomachine 120 . The steam trip valve 140 is disposed at the inlet port 121 of the turbine unit 120 , and the steam control valve 130 is disposed at an upstream position relative to the steam trip valve 140 on the path where the steam source 110 provides steam AS to the inlet port 121 .

The steam trip valve 140 has an oil inlet port 141 and an oil outlet port 143 , wherein the oil inlet port 141 is connected to the speed regulating oil pump 160 , and the oil outlet port 143 is connected to the lubricating oil tank 170 . The speed regulating oil pump 160 is connected to the lubricating oil tank 170 and the main shaft 125 , driven by the main shaft 125 to provide lubricating oil and corresponding oil pressure to the steam trip valve 140 . The speed regulating spring (not shown) in the steam trip valve 140 can adjust the pressure of the spring according to the oil pressure received by the oil inlet port 141 , thereby controlling the opening of the steam valve disc of the steam trip valve 140 . The greater the oil pressure provided, the smaller the opening of the steam valve disc, the larger the area of the steam valve disc blocking the inlet port 121, and the less the amount of steam flowing into the inlet port 121, so that the steam is controlled by the speed regulating spring. The opening of the valve disc can change the area of blocking the inlet port 121 to control the amount of steam received by the turbine unit 120 .

It can be seen from the above operation that the steam trip valve 140 is controlled by the oil pressure provided by the speed regulating oil pump 160 to control the size of the area blocking the inlet port 121, and the speed regulating oil pump 160 is driven by the main shaft 125 of the turbine unit 120 The corresponding oil pressure is generated according to the rotation speed of the main shaft 125 , and the turbine unit 120 adjusts the rotation speed of the turbine blades 123 according to the amount of steam received by the inlet port 121 . Usually, in the standby mode, the steam control valve 130 in the conventional single-stage steam turbine lubricating oil pump system 100 is set to a fully closed state, so the turbine unit 120 will not receive any steam and will not drive Adjusting the speed of the oil pump 160 causes the steam trip valve 140 not to receive oil pressure, and is in a fully open state.

When the single-stage steam turbine lubricating oil pump system 100 turns from the standby mode to the start-up mode (for example, when the oil pressure of the blower unit is lower than the set value), the steam control valve 130 is opened, because the steam trip valve 140 is also opened at this time state, so steam will flow into the inlet port 121 of the turbine unit 120 and start the turbo unit 120. However, at the moment of starting, due to the slow time of the oil pressure generated by the speed-regulating oil pump 160, the steam trip valve 140 cannot immediately reach the correct opening degree, causing the steam trip valve 140 to trip and allow a large amount of steam to enter The turbine unit 120 causes the turbo unit 120 to overspeed so that the main oil pump 150 cannot provide sufficient oil pressure to the blower unit, which increases the risk of damage to the blower unit.

Therefore, the purpose of the present invention is to provide a steam turbine lubricating oil pump system that prevents the steam trip valve from tripping, so that the correct oil pressure can be established for the blower unit when starting.

One aspect of the present invention is to provide a steam turbine lubricating oil pump system, which includes a first oil pump, a turbine unit, a steam trip valve, a lubricating oil tank, a second oil pump, and a three-way solenoid valve. The first oil pump is connected to the first oil tank and the blower unit. A turbomachine consists of an inlet port, turbine blades and a main shaft. The inlet port is used to receive steam from the steam source. The main shaft is connected with the first oil pump. The turbine blades are connected to the inlet port and the main shaft, and are used to drive the main shaft according to the steam received from the inlet port to drive the first oil pump to provide lubricating oil in the first oil tank to the blower unit. The steam trip valve is arranged at the inlet end of the turbine unit to control the amount of steam entering the inlet port according to the oil pressure, wherein the steam trip valve has a first oil inlet port and a first oil outlet port. The lubricating oil tank has a second oil inlet end connected with the first oil outlet end. The second oil pump is connected to the main shaft, the lubricating oil tank and the steam trip valve, and is used to drive the main shaft to supply the lubricating oil in the lubricating oil tank and the corresponding first oil pressure to the steam trip valve, wherein the second oil pump has a second oil outlet end. The three-way solenoid valve has a first end, a second end and a third end. The first oil tank is connected to the first end through the first pipeline, the second oil outlet is connected to the second end and the first oil inlet through the second pipeline, and the second oil inlet is connected to the third end through the third pipeline.

In some embodiments, when the steam turbine lubricating oil pump system is in standby mode, the first end and the second end of the three-way solenoid valve are opened and the third end is blocked, and the lubricating oil in the first oil tank and the corresponding second oil pressure pass through The first pipeline and the second pipeline are delivered to the first oil inlet port, so as to control the steam trip valve to block the inlet port to prevent steam from entering the turbine unit.

In some embodiments, the steam turbine lubricating oil pump system further includes a first needle valve disposed on the first pipeline for generating a second oil pressure.

In some embodiments, the second oil pressure is 6 kg/cm ² .

In some embodiments, when the steam turbine lubricating oil pump system is in the start-up mode, the first end and the third end of the three-way solenoid valve are opened and the second end is blocked, and the lubricating oil in the first oil tank and the corresponding second oil pressure pass through The first pipeline and the third pipeline are sent to the second oil inlet port, so as to control the steam trip valve to open the inlet port to drive the turbine unit, thereby driving the second oil pump to supply the lubricating oil in the lubricating oil tank and the corresponding first oil pressure Give steam trip valve.

In some embodiments, the steam turbine lubricating oil pump system further includes a second oil tank, and the second oil tank is connected to the lubricating oil tank through the fourth pipeline.

In some embodiments, the steam turbine lubricating oil pump system further includes a first check valve disposed on the first pipeline to prevent the lubricating oil in the first pipeline from flowing back into the first oil tank.

In some embodiments, the steam turbine lubricating oil pump system further includes a second check valve and a third check valve arranged on the second pipeline, wherein the second check valve is used to prevent the lubricating oil in the second pipeline from flowing back To the second end of the three-way solenoid valve, the third check valve prevents the lubricating oil in the second pipeline from flowing back to the second oil outlet.

In some embodiments, the steam turbine lubricating oil pump system further includes a fourth check valve disposed on the third pipeline to prevent the lubricating oil in the third pipeline from flowing back to the third end of the three-way solenoid valve.

In some embodiments, the steam turbine lubricating oil pump system further includes a second needle valve disposed on the third pipeline for controlling the amount of lubricating oil flowing into the third pipeline of the second oil inlet port.

The function of this new model is to set the lubricating oil provided by the first oil tank to the normally closed state in the standby mode of the steam trip valve, and stop supplying the lubricating oil in the first oil tank to the steam trip when switching to the start-up mode Valve, so that the steam trip valve is gradually opened due to the reduced oil pressure, avoiding the turbine unit from receiving a large amount of steam at the moment of switching, thereby preventing the steam trip valve from losing speed. Therefore, the first oil pump can operate stably through the turbine unit to provide stable oil pressure to the blower unit.

In order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, preferred embodiments of the present invention will be specifically cited below, together with the attached drawings, for a detailed description as follows.

Please refer to FIG. 2 , which is a schematic diagram of a steam turbine lubricating oil pump system 200 according to an embodiment of the present invention. The steam turbine lubricating oil pump system 200 can be used as an emergency standby unit that provides lubricating oil and corresponding oil pressure to the blower unit (not shown). When the oil pressure of the blower unit is lower than the set value, the steam turbine lubricating oil pump system 200 can be switched from the standby mode to the start mode, and starts immediately to provide sufficient oil pressure to the blower unit. The steam turbine lubricating oil pump system 200 may include a first oil pump 210 , a turbo unit 220 , a steam trip valve 230 , a lubricating oil tank 240 , a second oil pump 250 and a three-way solenoid valve 260 . The first oil pump 210 is connected to the first oil tank 270 and the blower unit (not shown). In some embodiments, the first oil tank 270 can be, for example, the oil system of the blower unit, so it can be recycled, but the present invention is not limited thereto. The turbomachine 220 includes an inlet port 221 , turbine blades 223 and a main shaft 225 . The inlet port 221 is used to receive the steam AS from the steam source 280 . The main shaft 225 is connected to the first oil pump 210 . The turbine blade 223 is connected to the inlet port 221 and the main shaft 225 to drive the main shaft 225 according to the steam AS received from the inlet port 221 to drive the first oil pump 210 to provide lubricating oil in the first oil sump 270 to the blower unit. The steam trip valve 230 is arranged at the inlet port 221 of the turbine unit 220 to control the amount of steam AS entering the inlet port 221 according to the oil pressure, wherein the steam trip valve 230 has a first oil inlet port 231 and a first oil outlet port 232. The lubricating oil tank 240 has a second oil inlet port 241 connected to the first oil outlet port 232 . The second oil pump 250 is connected to the main shaft 225, the lubricating oil tank 240 and the steam trip valve 230, and is used to drive the main shaft 225 to provide the lubricating oil in the lubricating oil tank 240 and the corresponding first oil pressure to the steam trip valve 230, wherein the second oil pump 250 The second oil pump 250 has a second oil outlet 251 . The three-way solenoid valve 260 has a first end 261 , a second end 262 and a third end 263 . The first oil tank 270 is connected to the first end 261 of the three-way solenoid valve 260 through the first pipeline L1, and the second oil outlet 251 of the second oil pump 250 is connected to the second end of the three-way solenoid valve 260 through the second pipeline L2. The end 262 is connected to the first oil inlet end 231 of the steam trip valve 230, and the second oil inlet end 241 of the lubricating oil tank 240 is connected to the third end 263 of the three-way solenoid valve 260 via the third pipeline L3.

In this embodiment, the steam turbine lubricating oil pump system 200 may further include a steam control valve 291 . The steam control valve 291 is arranged on the path where the steam source 280 provides steam AS to the inlet port 221 and at an upstream position relative to the steam trip valve 230, wherein the steam control valve 291 is set to a fully open state in the standby mode and the power-on mode , so the steam AS from the steam source 280 will always be provided to the inlet port 221 of the turbomachine 220 .

In this embodiment, when the steam turbine lubricating oil pump system 200 is in the standby mode, the first end 261 and the second end 262 of the three-way solenoid valve 260 are opened and the third end 263 is cut off, the lubricating oil in the first oil tank 270 and the corresponding The second oil pressure is delivered to the first oil inlet port 231 through the first pipeline L1 and the second pipeline L2 , so as to control the steam trip valve 230 to block the inlet port 221 to prevent the steam AS from entering the turbine unit 220 . In this embodiment, the steam turbine lubricating oil pump system 200 further includes a first needle valve S5 disposed on the first pipeline L1 for generating the second oil pressure.

Specifically, the steam turbine lubricating oil pump system 200 of the present invention uses the pressure source of the first oil tank 270 (that is, the oil system of the blower unit) to control the speed regulating spring (not shown) of the steam trip valve 230, so that The steam valve disk (not shown) of the steam trip valve 230 is controlled to open to a minimum, that is, the steam valve disk of the steam trip valve 230 is completely closed. Therefore, in the standby mode, the steam trip valve 230 can completely block the inlet port 221 of the turbo-set 220 according to the second oil pressure provided from the first oil sump 270 , so the turbo-set 220 will not receive steam AS. In some embodiments, the second oil pressure can be set to 6 kg/cm2.

In this embodiment, when the steam turbine lubricating oil pump system 200 switches from the standby mode to the start-up mode, the first end 261 and the third end 263 of the three-way solenoid valve 260 are open and the second end 262 is closed. At this time, the lubricating oil in the first oil tank 270 and the corresponding second oil pressure are sent to the second oil inlet port 241 of the lubricating oil tank 240 through the first pipeline L1 and the third pipeline L3, so as to provide the oil that was originally provided for the steam to escape. The lubricating oil of the valve 230 is drained to the lubricating oil tank 240 . Therefore, the oil pressure received by the steam trip valve 230 gradually decreases, and the pressure of the speed regulating spring of the steam trip valve 230 decreases, so that the steam valve disk of the steam trip valve 230 gradually opens. In this way, the steam AS of the steam source 280 can flow into the inlet port 221 of the turbo unit 220 . The turbine unit 200 will start after receiving the steam AS, so that the turbine blades 223 rotate and drive the main shaft 225 to rotate together, and then drive the second oil pump 250 to transfer the lubricating oil in the lubricating oil tank 240 and the corresponding first oil pressure from the second oil outlet. 251 is delivered to the first oil inlet port 231 of the steam trip valve 230 through the second oil pipeline L2. The steam trip valve 230 controls the steam valve disc to achieve the correct opening degree according to the first oil pressure, so that the turbo unit 220 receives the correct amount of steam. In some embodiments, the first oil pressure can be set to 3 kg/cm2.

Through the above configuration, the lubricating oil provided by the steam trip valve 230 through the first oil tank 270 in the standby mode is set to a normally closed state, and when switching to the starting mode, the supply of lubricating oil in the first oil tank 270 to the steam is stopped. The trip valve 230 makes the steam trip valve 230 gradually open due to the reduced oil pressure, avoiding the turbine unit 220 from receiving a large amount of steam AS at the moment of switching, thereby preventing the steam trip valve 230 from decelerating. Therefore, the first oil pump 210 can operate stably through the turbo unit 220 to provide stable oil pressure to the blower unit.

In this embodiment, the steam turbine lubricating oil pump system 200 further includes a second oil tank 292, and the second oil tank 292 is connected to the lubricating oil tank 240 through the fourth pipeline L4. Since the lubricating oil tank 240 in this embodiment also receives the lubricating oil from the first oil sump 270 , rather than only the lubricating oil in the lubricating oil tank 240 circulates between the lubricating oil tank 240 and the steam trip valve 230 . Therefore, when the lubricating oil in the lubricating oil tank 240 is greater than an upper limit, the lubricating oil can be drained to the second oil tank 292 through the fourth pipeline L4.

In some embodiments, the steam turbine lubricating oil pump system 200 further includes a second needle valve S6 disposed on the third pipeline L3 to control the flow into the third pipeline L3 of the second oil inlet port 241 of the lubricating oil tank 240 The amount of lubricating oil in it.

In some embodiments, the steam turbine lubricating oil pump system 200 further includes a first check valve S1 disposed on the first pipeline L1 to prevent the lubricating oil in the first pipeline L1 from flowing back into the first oil sump 270 .

In some embodiments, the steam turbine lubricating oil pump system further includes a second check valve S2 and a third check valve S3 arranged on the second pipeline L2, wherein the second check valve S2 is used to prevent the second pipeline from The lubricating oil in L2 flows back to the second end 262 of the three-way solenoid valve 260 , and the third check valve S3 prevents the lubricating oil in the second pipeline L2 from flowing back to the second oil outlet 251 of the second oil pump 250 .

In some embodiments, the steam turbine lubricating oil pump system 200 further includes a fourth check valve S4 arranged on the third pipeline L3 to prevent the lubricating oil in the third pipeline L3 from flowing back to the three-way solenoid valve 260 The third end 263 of.

Although the present invention has been disclosed with preferred embodiments, it is not intended to limit the present invention. Any person familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

100:Single-stage steam turbine lubricating oil pump system 200: Steam turbine oil pump system 110, 280: steam source 120, 220: turbine unit 121, 221: entrance port 123, 223: turbine blade 125, 225: spindle 130, 291: steam control valve 140, 230: steam trip valve 141: Oil inlet end 143: Oil outlet 231: The first oil inlet port 232: The first oil outlet 150: main oil pump 160: Speed regulating oil pump 170, 240: lubricating oil tank 241: The second oil inlet port 180: main oil tank 210: The first oil pump 250: Second oil pump 251: Second oil outlet 260:Three-way solenoid valve 261: first end 262: second end 263: third end 270: The first oil tank 292: The second oil tank AS: steam L1: the first pipeline L2: the second pipeline L3: The third pipeline L4: The fourth pipeline S1: first check valve S2: Second check valve S3: The third check valve S4: Fourth check valve S5: The first needle valve S6: Second needle valve

Figure 1 is a schematic diagram showing a conventional single-stage steam turbine lubricating oil pump system; FIG. 2 is a schematic diagram of a steam turbine lubricating oil pump system according to an embodiment of the present invention.

200: Steam turbine oil pump system

210: The first oil pump

220: turbine unit

221: Entry port

223: turbine blade

225:Spindle

291:Steam control valve

230: Steam trip valve

231: The first oil inlet port

232: The first oil outlet

240: oil tank

241: The second oil inlet port

250: Second oil pump

251: Second oil outlet

260:Three-way solenoid valve

261: first end

262: second end

263: third end

270: The first oil tank

280: steam source

292: The second oil tank

AS: steam

L1: the first pipeline

L2: the second pipeline

L3: The third pipeline

L4: The fourth pipeline

S1: first check valve

S2: Second check valve

S3: The third check valve

S4: Fourth check valve

S5: The first needle valve

S6: Second needle valve

Claims (10)

A steam turbine lubricating oil pump system, comprising: A first oil pump, connected to a first oil tank and a blower unit; A turbine unit, comprising: an inlet port for receiving steam from a steam source; a main shaft connected to the first oil pump; and A turbine blade, connected to the inlet port and the main shaft, is used to drive the main shaft according to the steam received from the inlet port to drive the first oil pump to provide the lubricating oil in the first oil tank to the blower unit; a steam trip valve, arranged at the inlet port of the turbine unit, to control the amount of steam entering the inlet port according to the oil pressure, wherein the steam trip valve has a first oil inlet port and a first oil outlet port; an oil tank having a second oil inlet connected to the first oil outlet; a second oil pump, connected to the main shaft, the lubricating oil tank and the steam trip valve, for driving according to the main shaft to provide lubricating oil in the lubricating oil tank and a corresponding first oil pressure to the steam trip valve, Wherein the second oil pump has a second oil outlet; and A three-way solenoid valve has a first end, a second end, and a third end, wherein the first oil tank is connected to the first end through a first pipeline, and the second oil outlet is connected to the second end through a second end. The pipeline connects the second end and the first oil inlet end, and the second oil inlet end is connected to the third end through a third pipeline. The steam turbine lubricating oil pump system according to claim 1, wherein in a standby mode, the first end of the three-way solenoid valve is connected to the second end and the third end is blocked, and the slide of the first oil groove Oil and a corresponding second oil pressure are delivered to the first oil inlet port through the first pipeline and the second pipeline, so as to control the steam trip valve to block the inlet port to prevent steam from entering the turbine unit. The steam turbine lubricating oil pump system according to claim 2 further includes a first needle valve disposed on the first pipeline for generating the second oil pressure. The steam turbine lubricating oil pump system according to claim 2 or 3, wherein the second oil pressure is 6 kg/cm ² . The steam turbine lubricating oil pump system as described in Claim 1, wherein in a start-up mode, the first end of the three-way solenoid valve is connected to the third end and the second end is blocked, and the slide of the first oil groove The oil and a corresponding second oil pressure are sent to the second oil inlet port through the first pipeline and the third pipeline, thereby controlling the steam trip valve to open the inlet port to drive the turbine unit, thereby driving the The second oil pump provides the lubricating oil in the lubricating oil tank and the corresponding first oil pressure to the vapor trip valve. The steam turbine lubricating oil pump system according to claim 1 further includes a second oil tank connected to the lubricating oil tank through a fourth pipeline. The steam turbine lubricating oil pump system according to claim 1 further includes a first check valve arranged on the first pipeline to prevent the lubricating oil in the first pipeline from flowing back into the first oil tank. The steam turbine lubricating oil pump system according to claim 1, further comprising a second check valve and a third check valve arranged on the second pipeline, wherein the second check valve is used to prevent the The lubricating oil in the second pipeline returns to the second end of the three-way solenoid valve, and the third check valve prevents the lubricating oil in the second pipeline from flowing back to the second oil outlet. The steam turbine lubricating oil pump system according to claim 1, further comprising a fourth check valve arranged on the third pipeline to prevent the lubricating oil in the third pipeline from flowing back to the three-way solenoid valve of the third end. The steam turbine lubricating oil pump system according to claim 1, further comprising a second needle valve arranged on the third pipeline to control the amount of lubricating oil flowing into the third pipeline of the second oil inlet port .

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