An air-cooling island condensate surplus energy recovery and liquid level regulation power generation device

Abstract

The invention discloses an air-cooling island condensate surplus energy recovery and liquid level regulation power generation device, wherein the main pipe comprises a first main pipe and a second main pipe, the outlet of the first main pipe is connected to the inlet of the second main pipe via a third electric regulating valve, the bypass outlet of the first main pipe is connected to the inlet of a hydraulic turbine via a pipeline and the first electric regulating valve, the outlet of the hydraulic turbine is connected to the bypass inlet of the second main pipe via a pipeline and the second electric regulating valve, the center hole of the runner of the hydraulic turbine is fixedly connected to one end of the main shaft, the other end of the main shaft is connected to the generator rotor, the generator is connected to the circuit breaker via a wire and is connected to the power grid, and a PLC controller is respectively connected to the signal ends of the generator, the circuit breaker, the first electric regulating valve, the second electric regulating valve and the third electric regulating valve via a wire; the invention has a simple structure and a novel and unique design, realizes the liquid level regulation of the air-cooling island condensate and the energy recovery of the condensate under a negative pressure environment, improves the utilization rate, has the characteristics of automatic operation, safety and reliability, and has remarkable economic and social benefits.

Description

Technical Field

[0001] The invention relates to a power generation device, in particular to an air-cooling island condensate water surplus energy recovery and liquid level regulation power generation device. Background Art

[0002] The height of the air-cooling island from the ground is generally more than 35m. The exhaust steam from the turbine of the direct air-cooling unit condenses in the tube bundle of the air-cooling condenser. The condensate first converges in the header and then flows to the collecting tank through the condensate downcomer. The amount of condensate changes with the load of the unit and the liquid level cannot be adjusted. Due to structural deficiencies, after entering the downcomer, due to the complex factors such as negative pressure environment, non-full pipe flow, water drop, cavitation erosion, etc., the vibration and noise are obvious, and the potential energy of the condensate is eventually wasted. Due to the shortage of water resources, direct air-cooling units are favored. The condensate of direct air-cooling units with a single unit capacity of 300MW to 1000MW can recover about 50~150kW of energy. The problems of stable control of the condensate level in the air-cooling island and potential energy recovery under vacuum environment need to be solved urgently. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an air-cooling island condensate surplus energy recovery and liquid level adjustment power generation device, which can effectively solve the current air-cooling island condensate level is uncontrollable and vibration and noise are obvious, and the problem of condensate energy recovery under the negative pressure environment of the air-cooling island.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is a power generation device for recovering excess energy of condensate from an air-cooled island and regulating liquid level, comprising a hydraulic turbine, a speed regulator and a main pipe, wherein the main pipe comprises a first main pipe and a second main pipe, wherein the outlet of the first main pipe is connected to the inlet of the second main pipe via a third electric regulating valve, the bypass outlet of the first main pipe is connected to the inlet of the hydraulic turbine via a pipeline and the first electric regulating valve, the outlet of the hydraulic turbine is connected to the bypass inlet of the second main pipe via a pipeline and the second electric regulating valve, the center hole of the runner of the hydraulic turbine is fixedly connected to one end of the main shaft, the other end of the main shaft is connected to the rotor of the generator, the generator is connected to the circuit breaker via a wire and is connected to the power grid, and the PLC controller is respectively connected to the signal ends of the generator, the circuit breaker, the first electric regulating valve, the second electric regulating valve and the third electric regulating valve via wires.

[0005] The present invention has a simple structure and a novel and unique design, realizes condensate level adjustment of the air-cooling island and condensate energy recovery under a negative pressure environment, improves utilization rate, has the characteristics of automatic operation, safety and reliability, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the structure of the present invention.

[0007] Figure 2It is a top view of the flow passage of the hydraulic turbine of the present invention.

[0008] Figure 3 It is a front view of the hydraulic turbine of the present invention. DETAILED DESCRIPTION

[0009] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings and specific circumstances.

[0010] In conjunction with the accompanying drawings, an air-cooling island condensate surplus energy recovery and liquid level regulation power generation device is provided, including a hydraulic turbine, a speed regulator and a main pipe, the main pipe includes a first main pipe 14 and a second main pipe 15, the outlet of the first main pipe 14 is connected to the inlet of the second main pipe 15 through a third electric regulating valve 9, the bypass outlet of the first main pipe 14 is connected to the inlet of the hydraulic turbine 1 through a pipeline and a first electric regulating valve 7, the outlet of the hydraulic turbine 1 is connected to the bypass inlet of the second main pipe 15 through a pipeline and a second electric regulating valve 8, the center hole of the runner 1-4 of the hydraulic turbine 1 is fixedly connected to one end of the main shaft 3, the other end of the main shaft 3 is connected to the rotor of the generator 4, the generator 4 is connected to the circuit breaker 5 through a wire and is connected to the power grid, and the PLC controller 6 is connected to the signal ends of the generator 4, the circuit breaker 5, the first electric regulating valve 7, the second electric regulating valve 8 and the third electric regulating valve 9 through wires.

[0011] To ensure better implementation effects, the first main pipe 14 is provided with a first pressure gauge 12 connected to the interior on the outside, the second main pipe 15 is provided with a thermometer 13 connected to the interior on the outside, the PLC controller 6 is connected to the signal ends of the first pressure gauge 12 and the thermometer 13 respectively via wires, the PLC controller 6 collects data from the first pressure gauge 12 and the thermometer 13, and sends a signal to the second electromagnetic 8 to adjust the opening, so as to ensure that the outlet has a pressure margin to prevent severe cavitation.

[0012] The hydraulic turbine 1 includes a volute 1-1, fixed guide vanes 1-2, movable guide vanes 1-3 and a runner 1-4. The volute 1-1 outlet is equipped with uniformly distributed fixed guide vanes 1-2, and the inside of the volute 1-1 outlet is equipped with movable guide vanes 1-3 on the warp axis alternately opened inside the fixed guide vanes 1-2. The runner 1-4 is installed in the outlet of the movable guide vanes 1-3, and the center hole of the runner 1-4 is connected to one end of the main shaft 3.

[0013] The hydraulic turbine 1 is equipped with a speed governor 2, and a PLC controller 6 is connected to the signal end of the speed governor 2 via a wire. The speed governor 2 includes a crank arm 2-1, a speed regulating ring 2-2, a push-pull rod 2-3, a reduction box 2-4, a speed governor motor 2-5 and a hand wheel 2-6. One end of the crank arm 2-1 is connected to the transmission shaft end of the movable guide vane 1-3, and the other end is evenly hinged on the circumference of the speed regulating ring 2-2. The speed regulating ring 2-2 is transmission-connected to the reduction box 2-4 via a push-pull rod 2-3, and the reduction box 2-4 is respectively connected to the speed governor motor 2-5 and the hand wheel 2-6. The PLC controller 6 collects data from the second pressure gauge 11 and compares it with the set condensate level setting range value (known technology), and sends a control signal to the speed governor motor 2-5, which drives the speed governor motor 2-5 to change the opening of the movable guide vane 1-3 to always ensure that the condensate level is stable within the set range.

[0014] The hydraulic turbine 1 draws pressurized water from the volute 1-1 through the water seal pipe 1-5 to connect the shaft seal 1-6, so as to keep the internal pressure of the shaft seal 1-6 always greater than the external atmospheric pressure.

[0015] The generator 5 is an asynchronous generator or a synchronous generator.

[0016] A second pressure gauge 11 connected to the interior is installed on the outside of the pipeline between the hydraulic turbine 1 and the second electromagnetic 8, and the PLC controller 6 is connected to the signal end of the second pressure gauge 11 via a wire.

[0017] A pressure reducing orifice plate 10 is installed in the outlet of the first main pipe 14 .

[0018] When a system failure occurs, the PLC controller 6 automatically turns off the first electromagnetic 7 and the second electromagnetic 8, opens the third electric regulating valve 9, and sends a disconnection signal to the circuit breaker 5 to keep the condensate water flowing smoothly.

[0019] When the present invention is used, the condensate of the unit enters the hydraulic turbine 1, drives the runners 1-4 to rotate, drives the main shaft 3 to rotate, the generator 4 works, and the power is connected to the power grid through the circuit breaker 5. After field application and use, the effect is good, and the relevant data are as follows:

[0020] An air-cooling island condensate surplus energy recovery and liquid level regulation power generation device is used for a 350MW direct air-cooling unit in the northwest of China. The condensate header is at an elevation of +45.3m, the header pipe diameter is DN450, and the downcomer with a pipe diameter of DN600 is connected to the middle of the header and vertically descends to the ground at a height of +5.9m from the ground and turns horizontal. The condensate volume of the unit fluctuates with the load by about 600~900m 3 / h, the vibration of the downcomer of the unit was obvious before the transformation, and the air-cooled island condensate surplus energy recovery and liquid level adjustment power generation device of the present invention was used for transformation. The diameter of the impeller was 35cm, the synchronous speed was 1000r / min, and the actual output of the asynchronous generator was about 45~68kW. The condensate level was stable in the range of 46±1m. After the transformation, the vibration intensity of the pipeline was significantly reduced, and the power generation device operated stably.

[0021] The present invention has a simple structure and a novel and unique design. Compared with the prior art, it has the following advantages:

[0022] (1) Control the condensate level within a certain range through the hydraulic turbine to reduce system vibration;

[0023] (2) Realize the recovery of condensate surplus energy of the hydraulic turbine under the high vacuum environment of the air cooling island, prevent severe cavitation of the hydraulic turbine through the PLC controller, and use pressurized water to seal the shaft seal to prevent air from entering the system and deteriorating the vacuum;

[0024] (3) When a unit failure occurs, the third electric regulating valve can be opened and the inlet and outlet valves of the hydraulic turbine can be closed at the same time to ensure that the condensate water system of the air-cooling island system is always unobstructed, safe and reliable, thereby improving utilization, reducing costs, and solving the problem of condensate water energy recovery under the negative pressure environment of the air-cooling island, with significant social and economic benefits.

Claims

1. An air-cooling island condensate surplus energy recovery and liquid level regulation power generation device, comprising a hydraulic turbine, a speed regulator and a main pipe, characterized in that: The main pipe comprises a first main pipe (14) and a second main pipe (15), the outlet of the first main pipe (14) is connected to the inlet of the second main pipe (15) via a third electric regulating valve (9), the bypass outlet of the first main pipe (14) is connected to the inlet of the hydraulic turbine (1) via a pipeline and a first electric regulating valve (7), the outlet of the hydraulic turbine (1) is connected to the bypass inlet of the second main pipe (15) via a pipeline and a second electric regulating valve (8), the center hole of the runner (1-4) of the hydraulic turbine (1) is fixedly connected to one end of the main shaft (3), the other end of the main shaft (3) is connected to the rotor of the generator (4), and the generator (4) is connected to the circuit breaker (1) via a wire. 5) is connected to the power grid, and the PLC controller (6) is connected to the signal ends of the generator (4), the circuit breaker (5), the first electric regulating valve (7), the second electric regulating valve (8) and the third electric regulating valve (9) through wires. When a system failure occurs, the first electric regulating valve (7) and the second electric regulating valve (8) are automatically closed, and the third electric regulating valve (9) is opened at the same time, and a disconnection signal is sent to the circuit breaker (5) to keep the condensate water flowing smoothly. The hydraulic turbine (1) comprises a volute (1-1), fixed guide vanes (1-2), movable guide vanes (1-3) and a runner (1-4). The volute (1-1) is equipped with uniformly distributed fixed guide vanes ( 1-2), a movable guide vane (1-3) is installed on a warp axis alternately opened inside the fixed guide vane (1-2) at the outlet of the volute (1-1), a runner (1-4) is installed in the outlet of the movable guide vane (1-3), and the center hole of the runner (1-4) is connected to one end of the main shaft (3); a speed governor (2) is installed on the hydraulic turbine (1), a PLC controller (6) is connected to the signal end of the speed governor (2) through a wire, and the speed governor (2) includes a crank arm (2-1), a speed regulating ring (2-2), a push-pull rod (2-3) and a reduction box (2-4), a speed governor motor (2-5) and a hand wheel (2-6), one end of the crank arm (2-1) is connected to the movable guide vane The transmission shaft end of the speed regulating ring (1-3) is connected, and the other end is evenly hinged on the circumference of the speed regulating ring (2-2). The speed regulating ring (2-2) is connected to the reduction box (2-4) through the push-pull rod (2-3). The reduction box (2-4) is connected to the speed regulating motor (2-5) and the hand wheel (2-6) respectively. The PLC controller (6) collects data from the second pressure gauge (11) and compares it with the set condensate level setting range value, and sends a control signal to the speed regulating motor (2-5). The speed regulating motor (2-5) drives the speed regulating ring (2) to change the opening of the movable guide vane (1-3) to always ensure that the condensate level is stable within the set range.The first main pipe (14) is provided with a first pressure gauge (12) connected to the inside on the outside, and the second main pipe (15) is provided with a thermometer (13) connected to the inside on the outside. The PLC controller (6) is connected to the signal ends of the first pressure gauge (12) and the thermometer (13) via wires. The PLC controller 6 collects data from the first pressure gauge 12 and the thermometer 13, and sends a signal to the second electromagnetic 8 to adjust the opening, so as to ensure that the outlet has a pressure margin to prevent severe cavitation. The hydraulic turbine (1) draws pressure water from the volute (1-1) through the water seal pipe (1-5) to connect the shaft seal (1-6), so as to keep the internal pressure of the shaft seal (1-6) always greater than the external atmospheric pressure.

2. The air-cooling island condensate surplus energy recovery and liquid level adjustment power generation device according to claim 1 is characterized in that: The generator (5) is an asynchronous generator or a synchronous generator.

3. The air-cooling island condensate surplus energy recovery and liquid level adjustment power generation device according to claim 1 is characterized in that: A second pressure gauge (11) connected to the inside of the pipeline between the hydraulic turbine (1) and the second electric regulating valve (8) is installed on the outside of the pipeline, and the PLC controller (6) is connected to the signal end of the second pressure gauge (11) via a wire.

4. The air-cooling island condensate surplus energy recovery and liquid level adjustment power generation device according to claim 1 is characterized in that: A pressure reducing orifice plate (10) is installed in the outlet of the first main pipe (14).

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