A steam turbine generator sealing oil circulation system

Abstract

The present invention specifically discloses a steam turbine generator sealing oil circulation system, including a lubricating oil storage tank, a lubricating oil delivery pump, a small machine lubricating oil device and a single flow ring sealing oil device, wherein the oil outlet of the lubricating oil storage tank is connected to the oil extraction port of the lubricating oil delivery pump; the small machine lubricating oil device is provided with a small machine lubricating oil tank, the oil inlet of the small machine lubricating oil tank is connected to the oil outlet of the lubricating oil delivery pump, and the sealing oil outlet of the small machine lubricating oil tank is connected to the input pipe port of the single flow ring sealing oil device through a first delivery pipe. The sealing oil circulation system switches the oil source to the small machine lubricating oil, so that it establishes a new overall circulation process of the sealing oil system, thereby ensuring that the generator can be subjected to the wind pressure test when the lubricating oil system is not started, thereby improving the progress of the generator wind pressure leak detection and saving time for the unit to be connected to the grid in advance.

Description

Technical Field

[0001] The invention relates to a steam turbine generator sealing oil system, in particular to a steam turbine generator sealing oil circulation system. Background Art

[0002] The main function of the single-flow ring sealing oil system of a thermal power plant generator is to supply oil to the generator sealing pads and make the oil pressure higher than the hydrogen pressure inside the generator by a certain value to prevent the hydrogen inside the generator from leaking out along the gap between the rotating shaft and the sealing pads. At the same time, it also prevents the oil pressure from being too high, which may cause a large amount of oil to enter the generator.

[0003] However, during the cylinder opening period of most existing steam turbines, the lubricating oil system is in a shutdown state, and the main engine lubricating oil-related equipment is also in a shutdown state; since the oil source of the single-flow ring sealing oil system comes from the main engine lubricating oil, the steam turbine generator sealing oil system cannot perform the overall circulation of the sealing oil, and then the generator wind pressure test is carried out, affecting the unit's grid-connected time. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a steam turbine generator sealing oil circulation system. The steam turbine generator sealing oil circulation system switches the oil source to the small machine lubricating oil, so as to establish a new overall circulation process of the sealing oil system, thereby ensuring that the generator wind pressure test can be carried out when the lubricating oil system is not started.

[0005] The above-mentioned problem to be solved by the present invention is achieved through the following technical solutions:

[0006] A steam turbine generator sealing oil circulation system comprises a lubricating oil storage tank, a lubricating oil delivery pump, a small machine lubricating oil device and a single flow ring sealing oil device, wherein the oil outlet of the lubricating oil storage tank is connected to the oil suction port of the lubricating oil delivery pump; the small machine lubricating oil device is provided with a small machine lubricating oil tank, the oil inlet of the small machine lubricating oil tank is connected to the oil outlet of the lubricating oil delivery pump, and the sealing oil outlet of the small machine lubricating oil tank is connected to the input pipe port of the single flow ring sealing oil device through a first delivery pipe.

[0007] Preferably, it also includes a main engine lubricating oil device, on which a main engine lubricating oil tank is provided, the oil inlet of the main engine lubricating oil tank is connected to the oil outlet of the lubricating oil delivery pump, and the sealing oil delivery port of the main engine lubricating oil tank is connected to the input pipe port of the single-flow ring sealing oil device through a second delivery pipe.

[0008] Preferably, the main engine lubricating oil device and the small engine lubricating oil device are distributed in parallel, and the main engine lubricating oil device and the small engine lubricating oil device are connected through a second flow control valve, a third connecting pipe and an input pipe port of the single flow ring sealing oil device, and either the main engine lubricating oil device or the small engine lubricating oil device operates alone to deliver sealing oil or both of them deliver sealing oil at the same time.

[0009] Preferably, the first delivery pipe is selected from one or more combinations of a straight pipe, a bent pipe, a curved pipe or an irregular pipe with a sealing ring.

[0010] Preferably, a first flow control valve is provided on the first delivery pipe.

[0011] Preferably, the second delivery pipe is selected from one or more combinations of a straight pipe, a bent pipe, a curved pipe or an irregular pipe with a sealing ring.

[0012] Preferably, a third flow control valve is provided on the second delivery pipe.

[0013] Preferably, the single-flow ring sealing oil device includes a generator, an oil return expansion groove, an air extraction groove, a float oil tank, a vacuum box and an oil delivery assembly, the oil return expansion groove and the air extraction groove are respectively connected to the steam end and the excitation end of the generator sealing ring through pipelines, the oil return expansion groove is respectively connected to the air extraction groove through two pipelines, a float oil tank and a float oil tank oil level regulating valve are sequentially provided on one of the pipelines, wherein the two ends of the float oil tank are respectively provided with an outlet electric door and an inlet electric door, and a second bypass electric door is provided on the other pipeline; the first oil inlet end of the vacuum box is connected to the input pipe mouth, and the oil outlet end of the vacuum box is connected to the generator through the oil delivery assembly.

[0014] Preferably, the oil delivery assembly includes a second main sealing oil pump, a first main sealing oil pump and a sealing oil recirculation pump distributed in parallel, and both ends of the sealing oil recirculation pump are respectively connected to the second oil inlet end of the vacuum box and the oil outlet end of the vacuum box; the second main sealing oil pump and the first main sealing oil pump are respectively connected to the oil outlet end of the vacuum box and the generator through delivery pipelines.

[0015] Preferably, the single-flow ring sealing oil device also includes an oil-gas separator and an oil-gas absorber, and the two ends of the oil-gas separator are respectively connected to the air outlet of the air extraction groove and the air inlet of the oil-gas absorber, which is used to separate and adsorb hydrogen.

[0016] Beneficial effect: After adopting the structure described in the present invention, the input pipe port of the single-flow ring sealing oil device is connected with the small machine lubricating oil tank, breaking the conventional practice of mainly providing sealing cooling oil to the single-flow ring sealing oil device by the main engine lubricating oil tank of the main engine lubricating oil system. During the period when the turbine cylinder is opened, the lubricating oil system is in a shutdown state, and the main engine lubricating oil delivery process cannot be carried out normally. By switching the operating oil source of the single-flow ring sealing oil device to the small machine lubricating oil, a new overall circulation process of the sealing oil system is established, thereby ensuring that the generator air pressure test can be carried out when the lubricating oil system is not started, thereby improving the progress of the generator air pressure leak detection and saving time for the unit to be connected to the grid in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention discloses a schematic diagram of a circulation principle of a steam turbine generator sealing oil circulation system.

[0018] Figure 2 The present invention is a schematic diagram of the structural principle of a steam turbine generator sealing oil circulation system.

[0019] Figure 3 It is another schematic diagram of the circulation principle of the steam turbine generator sealing oil circulation system described in the present invention.

[0020] Figure 4 It is another structural principle schematic diagram of a steam turbine generator sealing oil circulation system described in the present invention.

[0021] Figure 5 The present invention discloses a structural schematic diagram of a small machine lubricating oil tank of a steam turbine generator sealing oil circulation system.

[0022] Figure 6 The present invention discloses a schematic structural diagram of a main engine lubricating oil tank of a steam turbine generator sealing oil circulation system.

[0023] Figure 1-6Middle: 1-lubricating oil storage tank; 2-lubricating oil delivery pump; 3-small machine lubricating oil device; 31-small machine lubricating oil tank; 311-seal oil outlet; 312-first delivery pipe; 313-first flow control valve; 4-single flow ring seal oil device; 40-input pipe port; 401-second flow control valve; 5-main engine lubricating oil device; 51-main engine lubricating oil tank; 511-second delivery pipe; 512-third flow control valve; 513-seal oil delivery port; 514-return oil port; 6-generator; 61-steam end; 62-excitation end; 7-return oil expansion tank; 8-air extraction tank; 9-float oil tank; 10-vacuum box; 11-oil-gas separator; 12-oil-gas absorber; 13-oil supply regulating valve; 14-first bypass electric door; 15-export electric door; 16-import electric door; 17-second bypass electric door; 18-oil delivery assembly; 181-second main sealing oil pump; 182-first main sealing oil pump; 183-sealing oil recirculation pump; 19-filter assembly; 191-first oil supply filter; 192-second oil supply filter. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the embodiments do not limit the present invention in any form.

[0025] like Figure 1-2 As shown in Figure 5, a steam turbine generator sealing oil circulation system comprises a lubricating oil storage tank 1, a lubricating oil delivery pump 2, a small machine lubricating oil device 3 and a single flow ring sealing oil device 4, wherein the oil outlet of the lubricating oil storage tank 1 is connected to the oil suction port of the lubricating oil delivery pump 2; the small machine lubricating oil device 3 is provided with a small machine lubricating oil tank 31, the oil inlet of the small machine lubricating oil tank 31 is connected to the oil outlet of the lubricating oil delivery pump 2, and the sealing oil outlet 311 of the small machine lubricating oil tank 31 is connected to the input pipe port 40 of the single flow ring sealing oil device 4 through a first delivery pipe 312.

[0026] By connecting the small machine lubricating oil tank with the input pipe of the single-flow ring sealing oil device, the conventional practice of only using the main engine lubricating oil tank of the main engine lubricating oil system to provide sealing cooling oil to the single-flow ring sealing oil device is broken. During the period when the turbine is opened, the lubricating oil system is in a shutdown state, and the main engine lubricating oil delivery process cannot be carried out normally. By switching the operating oil source of the single-flow ring sealing oil device to the small machine lubricating oil, a new overall circulation process of the sealing oil system is established, thereby ensuring that the generator air pressure test can be carried out when the lubricating oil system is not started, thereby improving the progress of the generator air pressure leak detection and saving time for early grid connection of the unit.

[0027] Among them, the generator wind pressure test is mainly to check the stator sealing condition of the generator after maintenance, to ensure that the hydrogen leakage of the generator reaches the predetermined target, and to implement the overall air tightness test of the generator hydrogen system to check the assembly sealing of the entire generator hydrogen system.

[0028] Among them, the small machine lubricating oil device 3 includes a small machine lubricating oil tank 31, an oil filter, two AC oil pumps, a DC oil pump, two parallel oil coolers, a smoke exhaust device, a switching valve, a relief valve, a check valve, a set of oil pipelines, oil supply and return oil pipelines, an oil level indicator and electric heater equipment and components; specifically, the effective volume of the small machine lubricating oil tank 31 is 40L; the small machine lubricating oil tank 31 is equipped with a relief valve, a check valve, a throttle valve, an electric heater and internal oil pipelines in and on the box; the small machine lubricating oil tank 31 is also connected to two AC oil pumps, an oil level indicator, a smoke exhaust device, a parallel oil cooler and a six-way switching valve and three sets of electric heaters; the small machine lubricating oil device 3 is also provided with a DC emergency oil pump, which is used to provide lubricating oil when the unit loses AC power, so that the unit can be shut down safely.

[0029] Specifically, the first delivery pipe 312 is selected from one or more combinations of straight pipes, bent pipes, arc-shaped pipes or irregular pipes with sealing rings. During the process of switching and delivering sealing oil, the sealing oil can be stably delivered to the single-flow ring sealing oil device 4 through the first delivery pipe which is one or more combinations of straight pipes, bent pipes, arc-shaped pipes or irregular pipes with sealing rings, thereby avoiding leakage and the like.

[0030] Among them, the first delivery pipe 312 is preferably made of copper pipe, which is easy to process and connect, so that it can save materials and total cost during installation, has good stability and reliability, can save maintenance, and has light weight, good thermal conductivity, and high low-temperature strength. Of course, other first delivery pipes with the same or similar properties can also be used as delivery sealing oil pipes, and no specific restrictions are made here.

[0031] Specifically, a first flow control valve 313 is provided on the first delivery pipe 312, and the first flow control valve 313 is used to regulate the delivery of lubricating oil to the sealing oil system to improve its safety performance.

[0032] Specifically, Figure 3-4 , 6, also includes a main engine lubricating oil device 5, on which a main engine lubricating oil tank 51 is provided, the oil inlet of the main engine lubricating oil tank 51 is connected with the oil outlet of the lubricating oil delivery pump 2, and the sealing oil delivery port 513 of the main engine lubricating oil tank 51 is connected with the input pipe port 40 of the single-flow ring sealing oil device 4 through a second delivery pipe 511.

[0033] The main engine lubricating oil device 5 comprises a main steam turbine, a drain expansion tank, a pressure equalizing tank for providing double-sided steam sealing for the steam turbine, and a main engine lubricating oil tank 51 for providing lubricating oil for the steam turbine; the main engine lubricating oil tank 51 is connected to the main steam turbine through an AC lubricating oil pump and a DC lubricating oil pump, respectively, and the AC lubricating oil pump and the DC lubricating oil pump are interlocked with each other; a heat exchanger and a standby heat exchanger for cooling the lubricating oil are provided on the connecting pipeline between the main engine lubricating oil tank 51 and the main steam turbine; an oil filter for filtering impurities in the lubricating oil is provided on the cooling oil output pipeline of the heat exchanger and the standby heat exchanger, and an oil pressure detection device and a low oil pressure alarm device are provided on the lubricating oil pipeline connecting the oil filter and the main steam turbine; the actual capacity of the main engine lubricating oil tank 51 is 350L.

[0034] Specifically, the main engine lubricating oil device 5 and the small engine lubricating oil device 3 are arranged in parallel, and the main engine lubricating oil device 5 and the small engine lubricating oil device 3 are connected through the second flow control valve 401, the third connecting pipe and the input pipe port 40 of the single flow ring sealing oil device 4, and the main engine lubricating oil device 5 and the small engine lubricating oil device 3 either operate alone to deliver sealing oil or both deliver sealing oil at the same time. The cooperation between the main engine lubricating oil device 5 and the small engine lubricating oil device 3 can ensure the smoothness of the lubricating oil delivery to the single flow ring sealing oil device 4 regardless of whether the lubricating oil system is in a shutdown state during the turbine cylinder opening or in a normal operating state, further ensuring that the generator air pressure test can be carried out when the lubricating oil system is not started; improving the progress of the generator air pressure leak detection, saving time for the unit to be connected to the grid in advance, and also improving the diversity of operation.

[0035] Specifically, the second delivery pipe 511 is selected from one or more combinations of straight pipes, bent pipes, arc-shaped pipes or irregular pipes with sealing rings. During the conversion and delivery of sealing oil, the sealing oil can be stably delivered to the single-flow ring sealing oil device 4 through the first delivery pipe which is one or more combinations of straight pipes, bent pipes, arc-shaped pipes or irregular pipes with sealing rings, thereby avoiding leakage and the like.

[0036] Among them, the second delivery pipe 511 is preferably made of copper pipe, which is easy to process and connect, so that it can save materials and total cost during installation, has good stability and reliability, can save maintenance, and has light weight, good thermal conductivity, and high low-temperature strength. Of course, other first delivery pipes with the same or similar properties can also be used as delivery sealing oil pipes, and no specific restrictions are made here.

[0037] Specifically, the second delivery pipe 511 is provided with a third flow control valve 512, which regulates the delivery of lubricating oil to the sealing oil system through the first flow control valve 31, thereby improving its safety performance.

[0038] Specifically, the single-flow ring sealing oil device 4 includes a generator 6, an oil return expansion groove 7, an air extraction groove 8, a float oil tank 9, a vacuum box 10 and an oil delivery assembly 18. The oil return expansion groove 7 and the air extraction groove 50 are respectively connected to the steam end 61 and the excitation end 62 of the generator sealing ring 48 through pipelines. The oil return expansion groove 7 is connected to the air extraction groove 8 through two pipelines, and a float oil tank 9 and a float oil tank oil level regulating valve are sequentially arranged on one of the pipelines, wherein the two ends of the float oil tank 9 are respectively provided with an outlet electric door 15 and an inlet electric door 16, and a second bypass electric door 17 is arranged on the other pipeline; the first oil inlet end of the vacuum box 10 is connected to the input pipe port 40, and the oil outlet end of the vacuum box 10 is connected to the generator 6 through the oil delivery assembly 18.

[0039] Specifically, the oil delivery assembly 18 includes a second main sealing oil pump 181, a first main sealing oil pump 182 and a sealing oil recirculation pump 183 distributed in parallel, and the two ends of the sealing oil recirculation pump 183 are respectively connected to the second oil inlet end of the vacuum box 10 and the oil outlet end of the vacuum box 10; the second main sealing oil pump 181 and the first main sealing oil pump 182 are respectively connected to the oil outlet end of the vacuum box 10 and the generator 6 through delivery pipelines.

[0040] Specifically, a filter assembly 19, an oil supply regulating valve 13 and a first bypass electric door 14 are provided on the delivery pipeline. The filter assembly 19 includes a first oil supply filter 191 and a second oil supply filter 192, so that the sealing oil passes through the first main sealing oil pump 182 (or the second main sealing oil pump 181), the first oil supply filter 191 (or the second oil supply filter 192), the oil supply regulating valve 13 or the first bypass electric door 14 in sequence and enters the generator 6.

[0041] The vacuum box 10 is also called a vacuum oil tank.

[0042] Specifically, the single-flow ring sealing oil device 4 also includes an oil-gas separator 11 and an oil-gas absorber 12. The two ends of the oil-gas separator 11 are respectively connected to the air outlet of the air extraction groove 8 and the air inlet of the oil-gas absorber 12, which is used to separate and adsorb hydrogen.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings and the terms "first" and "second", which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0046] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A steam turbine generator sealing oil circulation system, characterized in that: It comprises a lubricating oil storage tank, a lubricating oil delivery pump, a small machine lubricating oil device and a single flow ring sealing oil device, wherein the oil outlet of the lubricating oil storage tank is connected to the oil extraction port of the lubricating oil delivery pump; the small machine lubricating oil device is provided with a small machine lubricating oil tank, the oil inlet of the small machine lubricating oil tank is connected to the oil outlet of the lubricating oil delivery pump, and the sealing oil outlet of the small machine lubricating oil tank is connected to the input pipe port of the single flow ring sealing oil device through a first delivery pipe; The steam turbine generator sealing oil circulation system also includes a main engine lubricating oil device, on which a main engine lubricating oil tank is provided, the oil inlet of the main engine lubricating oil tank is connected to the oil outlet of the lubricating oil delivery pump, and the sealing oil delivery port of the main engine lubricating oil tank is connected to the input pipe port of the single flow ring sealing oil device through a second delivery pipe; The main engine lubricating oil device and the small engine lubricating oil device are arranged in parallel, and the common end of the main engine lubricating oil device and the small engine lubricating oil device is connected to the input pipe port of the single flow ring sealing oil device through the second flow control valve and the third connecting pipe, and the main engine lubricating oil device and the small engine lubricating oil device either operate alone to deliver sealing oil or both operate simultaneously to deliver sealing oil; The main engine lubricating oil device includes a main steam turbine, a drain expansion tank, a pressure equalizing box for providing double-sided steam sealing for the main steam turbine, and the main engine lubricating oil tank for providing lubricating oil for the main steam turbine; the main engine lubricating oil tank is connected to the main steam turbine through an AC lubricating oil pump and a DC lubricating oil pump respectively, and the AC lubricating oil pump and the DC lubricating oil pump are interlocked with each other.

2. A steam turbine generator sealing oil circulation system according to claim 1, characterized in that: The first delivery pipe is selected from one or more combinations of a straight pipe, a folded pipe, and an arc-shaped pipe with a sealing ring.

3. A steam turbine generator sealing oil circulation system according to claim 2, characterized in that: The first delivery pipe is provided with a first flow control valve.

4. A steam turbine generator sealing oil circulation system according to claim 1, characterized in that: The second delivery pipe is selected from one or more combinations of a straight pipe, a folded pipe, and an arc-shaped pipe with a sealing ring.

5. A steam turbine generator sealing oil circulation system according to claim 4, characterized in that: The second delivery pipe is provided with a third flow control valve.

6. A steam turbine generator sealing oil circulation system according to claim 1, characterized in that: The single-flow ring sealing oil device includes a generator, an oil return expansion groove, an air extraction groove, a float oil tank, a vacuum box and an oil delivery assembly. The oil return expansion groove and the air extraction groove are respectively connected to the steam end and the excitation end of the generator sealing ring through pipelines. The oil return expansion groove is respectively connected to the air extraction groove through two pipelines. A float oil tank and a float oil tank oil level regulating valve are sequentially arranged on one of the pipelines. An outlet electric door and an inlet electric door are respectively arranged at both ends of the float oil tank; a second bypass electric door is arranged on the other pipeline; the first oil inlet end of the vacuum box is connected to the input pipe port, and the oil outlet end of the vacuum box is connected to the generator through the oil delivery assembly.

7. A steam turbine generator sealing oil circulation system according to claim 6, characterized in that: The oil delivery assembly includes a second main sealing oil pump, a first main sealing oil pump and a sealing oil recirculation pump which are distributed in parallel. The two ends of the sealing oil recirculation pump are respectively connected to the second oil inlet end of the vacuum box and the oil outlet end of the vacuum box; the second main sealing oil pump and the first main sealing oil pump are respectively connected to the oil outlet end of the vacuum box and the generator through delivery pipelines.

8. A steam turbine generator sealing oil circulation system according to claim 7, characterized in that: The single-flow ring sealing oil device also includes an oil-gas separator and an oil-gas absorber. The two ends of the oil-gas separator are respectively connected to the air outlet of the air extraction groove and the air inlet of the oil-gas absorber, and is used to separate and absorb hydrogen.

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