Water-turbine generator set and plant installation method

Abstract

The invention relates to the technical field of water turbines, and discloses a water-turbine generator set and plant installation method, which comprises the following steps: step 1, installing and fixing a draft tube and a flow channel structure thereof; 2, a volute and an overhauling structure on the side portion of the volute are installed and fixed; 3, a water inlet pipe structure is obliquely installed, and power station plant floor concrete and volute upper layer concrete are poured; 4, a rotating wheel, a guide vane assembly, a brake and an air inlet flange are installed; 5, a water turbine spindle and a rotating structure of the water turbine spindle are installed, and the rotating structure is directly supported by volute upper-layer concrete; and step 6, mounting the stator base, the upper rack, the thrust bearing of the upper rack, the support structure, the brush carrier structure and the water turbine air supply device. The overall structure is more compact, the size is smaller, and the investment cost of a power station is low.

Description

Technical Field

[0001] The invention relates to the technical field of water turbines, and in particular to an installation method of a water turbine generator set and a plant. Background Art

[0002] With the development of hydropower station technology, the capacity of single turbine generators is getting larger and larger. As a result, the investment cost of the units is getting higher and higher, and the return on investment for the hydropower station investment companies is getting smaller and smaller. The ultimate goal of power station investment companies is to ensure that less money is invested in the life cycle of the power station for several decades, so that the cost recovery period is shortened and the maximum profit can be obtained in the entire life cycle.

[0003] A hydro-turbine generator set refers to a generator that uses a turbine as the prime mover to convert water energy into electrical energy. A hydro-turbine generator set consists of a rotor, stator, frame, thrust bearing, guide bearing, cooler, brake and other main components. When water flows through the turbine, it converts water energy into mechanical energy, and the turbine's rotating shaft drives the rotor to convert mechanical energy into electrical energy for output.

[0004] Chinese patent document CN217380778U discloses an installation structure of a hydro-turbine generator set, including at least one hydro-turbine generator set, the hydro-turbine generator set includes a turbine and a generator, the generator includes a lower wind tunnel plate, a lower frame, a lower wind shield, a stator, an upper wind shield, a rotor, an upper frame, a thrust head, an upper cover plate, a base plate, an upper guide mechanism and a lower guide mechanism, the lower frame is assembled with the base plate and connected to the base plate by embedded bolts, the upper frame is fixedly connected to the stator by fixing bolts, a ball center device is arranged above the generator, the ball center device includes a ball center frame, a wire bob, a stabilizing device, an inductive measurement circuit and an adjusting device.

[0005] In the existing literature, the author Lu Cunming. "A Brief Discussion on the Installation Technology of Mixed Flow Hydropower Generator Sets". Hongshuihe 2020 Volume 39, Issue 1 discloses the installation process of hydropower generator sets: embedded parts installation stage, equipment assembly stage, equipment pre-installation and installation stage, and unit commissioning stage. During the pre-embedded stage of the unit, the plant has not been formed, and a crane is used to lift the embedded parts into the machine pit for installation. The main civil construction of the plant is completed, the installation and commissioning of the bridge crane is completed, and the conditions for unit installation are met; the assembly and installation of components such as stators, rotors, runners, and upper and lower frames are all carried out using bridge cranes. The civil construction is handed over to the plant installation site for unit assembly, turning, and axis adjustment; electrical equipment and auxiliary equipment systems are installed and commissioned simultaneously; after the installation is qualified, waterless and water-filled commissioning and unit trial operation tests are carried out.

[0006] The existing document "A Brief Discussion on the Installation Technology of Mixed Flow Hydropower Generator Sets" has the following shortcomings: the overall structure of the hydropower generator set to be installed is large, which requires a lot of civil construction around the set, resulting in high investment in the entire life cycle of the power station and low economic benefits. Summary of the invention

[0007] In order to solve the technical problem of how to miniaturize a water turbine unit and reduce the cost at the same time, the present invention provides a method for installing a water turbine generator unit and a plant, which is characterized by comprising the following steps: Step 1: Install and fix the tailwater pipe and its flow channel structure; Step 2, install and fix the inspection structure of the volute and its side; Step 3: Install the water inlet pipe structure at an angle, and pour the power plant floor concrete and the upper layer concrete of the volute; Step 4: Install the runner and guide vane assembly, brake and air inlet flange; Step 5: Install the turbine main shaft and its rotating structure, which is directly supported by the upper concrete layer of the volute; Step 6: Install the stator frame, upper frame and its thrust bearing, bracket structure, brush frame structure and turbine air supply device; Step 7: Install the generator fan cover.

[0008] In order to facilitate installation and arrangement, the inspection structure and the water inlet pipe structure are relatively arranged with the impeller and guide vane assembly as the center.

[0009] In order to facilitate maintenance, in step 2, the maintenance structure is arranged obliquely upward.

[0010] Preferably, the inspection structure comprises an inspection opening arranged obliquely upward, and an openable and closable inspection door is provided on the inspection opening.

[0011] Preferably, in step 2, the inspection structure is located at the large end of the volute.

[0012] In order to prevent water from flowing back into the runner, in step 1, the inclination angle of the flow channel structure relative to the horizontal plane is 10°~15°.

[0013] Preferably, step 7 also includes installing a generator floor and a generator ladder.

[0014] The present invention has the following beneficial effects: 1. The present invention cancels the installation of the lower frame, modifies the volute inspection position and the water inlet method, so that the overall height of the hydro-generator is reduced, the space between the turbine and the generator is reduced, and the overall structure is more compact and smaller, thereby reducing the height and layout of the entire power station plant. Only one floor of the plant floor is required, thereby greatly reducing the cost of concrete and steel investment in the power station. While ensuring the quality, safety and reliability of the hydropower station construction, the goal of minimizing the investment in the entire life cycle of the power station and maximizing the economic benefits generated is ultimately achieved. Compared with the investment cost in the prior art, the investment cost of the present invention is reduced by 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the installation of step 1 in the method for installing a hydro-generator set and a powerhouse of the present invention; Figure 2 The installation diagram of step 2 in the installation method of the hydro-generator set and the powerhouse of the present invention; Figure 3 It is a schematic diagram of the installation of the water inlet pipe structure in step 3 of the method for installing a hydro-generator set and a powerhouse of the present invention; Figure 4 It is a schematic diagram of the installation of the power plant floor concrete and the upper layer concrete of the spiral casing in step 3 of the method for installing the hydro-generator set and the plant of the present invention; Figure 5 The figure is a schematic diagram of the installation of step 4 in the method for installing a hydro-generator set and a powerhouse of the present invention; Figure 6 It is a schematic diagram of the installation of the brake and the air inlet flange in step 5 of the method for installing the hydro-generator set and the powerhouse of the present invention; Figure 7 It is a schematic diagram of the installation of the runner and guide vane assembly, the connecting rod structure, and the relay in step 5 of the method for installing the hydro-generator set and the powerhouse of the present invention; Figure 8 The figure is a schematic diagram of the installation of steps 5 and 6 in the method for installing a hydro-generator set and a powerhouse of the present invention; Fig. 9 The figure is a schematic diagram of the installation of steps 7 and 8 in the method for installing a hydro-generator set and a powerhouse of the present invention. DETAILED DESCRIPTION

[0016] The following is further described in detail through specific implementation methods: Those skilled in the art know that the main function of the volute is to introduce the water flow from the pressure water pipe into the water guide mechanism evenly and axially with less hydraulic loss, and then into the runner. It can make the water flow produce a certain amount of rotation (circulation) to meet the needs of the runner and make the water flow force around the runner uniform.

[0017] Draft tube: Draft tube is located below the turbine runner and is the main flow-through component. It connects the turbine runner outlet with the tailwater, and plays the role of guiding water flow, recovering energy and reducing energy loss.

[0018] The runner and guide vane assembly is mainly composed of five parts: the runner body, blades, blade operating mechanism, blade sealing device and drain cone; Turbine air supply device: a facility for supplying atmospheric air or compressed air into the flow-through parts of the turbine.

[0019] Upper frame: located on the upper part of the rotor and connected to the stator, playing a supporting and fixing role.

[0020] The figure marks in the drawings of the specification include: tailwater pipe 1, flow channel structure 2, volute 3, big head end 4, inspection port 5, inspection door 6, water inlet pipe structure 7, impeller and guide vane assembly 8, power station building floor concrete 9, volute upper layer concrete 10, hydropower station building wall concrete 11, lifting crane beam concrete 12, connecting rod structure 13, relay 14, guide bearing structure type brake 15, turbine 16, generator 17, air inlet flange 18, turbine main shaft 19, rotating structure 20, bottom ringless stator base 21, upper frame and thrust bearing 22, bracket structure 23, brush rack structure 24, turbine air supply device 25, generator wind cover 26, generator floor 27, generator ladder 28, and a first floor of the factory building 29.

[0021] Example 1 like Figure 1-9 As shown, a method for installing a hydro-generator set and a plant includes the following steps: Step 1, determine the elevation of the hydro-generator set, and use tie bars to fix and install the tailwater pipe 1 and its flow channel structure 2, wherein the flow channel structure 2 is arranged obliquely upward, and the inclination angle of the flow channel structure 2 relative to the horizontal plane is 15°; Step 2, installing and fixing the volute 3 and the inspection structure of the side of the big end 4 of the volute 3, wherein the inspection structure comprises an inspection port 5 arranged obliquely upward, and an openable and closable inspection door 6 is arranged on the inspection port 5; Step 3, the water inlet pipe structure 7 is installed at an angle, the inspection structure and the water inlet pipe structure 7 are arranged relative to each other with the runner and guide vane assembly 8 as the center, and the power plant floor concrete 9 and the upper layer concrete 10 of the volute are poured; Step 4, pouring the hydropower station building wall concrete 11 and the hoisting crane beam concrete 12; Step 5: Install the runner and guide vane assembly 8 of the turbine 16, the connecting rod structure 13, the relay 14, the guide bearing structure brake 15 and the air inlet flange 18 between the turbine 16 and the generator 17; Step 6: Install the rotating structure 20 of the turbine main shaft 19 and its generator 17. The rotating structure 20 is directly supported by the upper concrete layer 10 of the volute. The rotating structure 20 includes rotating parts such as a rotor, a stator, a turbine main shaft seal, a generator collector ring, and connecting bolts between the turbine shaft and the motor shaft; Step 7: Install the bottom ring-less stator base 21, the upper frame and its thrust bearing 22, the bracket structure 23, the brush frame structure 24, the turbine air supply device 25 and the pipeline.

[0022] Step 8: Install the generator hood 26, the generator floor 27 and the generator ladder 28.

[0023] In this embodiment, maintenance personnel enter the volute 3 through the maintenance structure on the side of the volute 3 for maintenance, and the lower frame is eliminated. The rotating structure 20 is directly supported by the upper concrete 10 of the volute, and the main shaft 19 of the turbine can also be shortened and thickened, so that the overall height of the installation of the hydro-generator set is reduced, and the support strength is also guaranteed; the water inlet pipe structure 7 is connected to the volute 3 obliquely downward, which requires less civil engineering than horizontal access to the volute 3, and the overall structure is more compact, thereby reducing the height and layout of the entire power station plant, and only one floor of the plant floor 29 is required. Compared with the investment cost of the prior art that requires the installation of the lower frame and the volute maintenance channel, the investment cost of the present invention is reduced by 20%.

[0024] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for installing a hydro-generator set and a plant, characterized in that: The following steps are involved: Step 1: Install and fix the tailwater pipe and its flow channel structure; Step 2, install and fix the inspection structure of the volute and its side; Step 3: Install the water inlet pipe structure at an angle, and pour the power plant floor concrete and the upper layer concrete of the volute; Step 4: Install the runner and guide vane assembly, brake and air inlet flange; Step 5: Install the turbine main shaft and its rotating structure, which is directly supported by the upper concrete layer of the volute; Step 6: Install the stator frame, upper frame and its thrust bearing, bracket structure, brush frame structure and turbine air supply device; Step 7: Install the generator fan cover.

2. The method for installing a hydro-generator set and a plant according to claim 1, characterized in that: The inspection structure and the water inlet pipe structure are arranged relatively to each other with the runner and guide vane assembly as the center.

3. The method for installing a hydro-generator set and a plant according to claim 2, characterized in that: In step 2, the inspection structure is arranged obliquely upward.

4. The method for installing a hydro-generator set and a plant according to claim 3 is characterized in that: The inspection structure comprises an inspection opening arranged obliquely upward, and an openable and closable inspection door is arranged on the inspection opening.

5. The method for installing a hydro-generator set and a plant according to claim 4, characterized in that: In step 2, the inspection structure is located at the large end of the volute.

6. The method for installing a hydro-generator set and a plant according to claim 5, characterized in that: In step 1, the inclination angle of the flow channel structure relative to the horizontal plane is 10°~15°.

7. The method for installing a hydro-generator set and a plant according to claim 6, characterized in that: Step 7 also includes installing the generator floor and generator ladder.

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