Novel steam turbine feed pump control system

Abstract

The utility model discloses a novel steam turbine feed pump control system which comprises an oil station, a hydraulic servo-motor, a diaphragm valve, an energy accumulator, a regeneration device and a servo control cabinet, the hydraulic servo-motor is connected with the oil station, the hydraulic servo-motor adjusts the diaphragm valve through a control valve quick-closing valve, the hydraulic servo-motor is connected with the energy accumulator and the regeneration device, and the energy accumulator is connected with the regeneration device. The energy accumulator is connected with a servo control cabinet, a control valve control seat is arranged on the control valve quick-closing valve, and the hydraulic servo-motor comprises a water feeding pump small machine, a frequency converter and an air feeder. The utility model has the beneficial effects that the control difficulty of the boiler is reduced, the energy consumption is reduced, the jamming probability of hydraulic components is reduced, the safety of a unit is improved, and the purpose of long-term stable operation is achieved; the manual maintenance cost is reduced, and the cost can be saved for enterprises.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a novel steam turbine feed water pump control system. Background Art

[0002] The actual switch stroke of the steam turbine speed regulating valve of the feedwater pump of the German Siemens control system is inconsistent with the valve position command. When the valve position command is below 20%, the actual regulating valve does not move; the speed regulating valve has an obvious adjustment dead zone when the linear output of the speed regulator is below 30% of the opening; a series of problems such as poor speed accuracy control lead to fluctuations in feedwater flow, increased difficulty in boiler control, and increased energy consumption; because the feedwater pump MEH hydraulic system shares the same oil source as the lubricating oil tank, the lubricating oil quality operating standard is low, which makes the system prone to jamming of hydraulic components such as the oil motor solenoid valve due to oil quality problems, and the probability of non-stopping increases; because the information required for maintenance is too little, it is difficult to quickly maintain and repair the equipment. The cost of spare parts and after-sales service is high and cannot meet production needs in a timely manner, which seriously affects the safe and efficient operation of the entire unit. Utility Model Content

[0003] The purpose of the utility model is to provide a novel turbine feed water pump control system to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of steam turbine feedwater pump control system, including an oil station, an oil motor, a diaphragm valve, an accumulator, a regeneration device and a servo control cabinet, the oil motor is connected to the oil station, the oil motor adjusts the diaphragm valve through a regulating valve speed closing valve, the oil motor is connected to the accumulator and the regeneration device, the accumulator is connected to the servo control cabinet, the regulating valve speed closing valve is provided with a regulating valve operating seat, and the oil motor includes a feedwater pump small machine, a frequency converter and a blower.

[0005] Preferably, the valve adjustment operating seat includes a spring chamber assembly, a mounting base and a displacement sensor assembly, the spring chamber assembly is arranged on the mounting base, and the displacement sensor assembly is arranged on the spring chamber assembly.

[0006] Preferably, the spring chamber assembly includes a cylinder, an upper end cover, a lower end cover and a spring, the upper end edge of the cylinder is provided with a slope, the upper end cover is in movably contact with the slope, the spring is arranged inside the cylinder, and the lower end cover is fixedly connected to the bottom end of the cylinder.

[0007] Preferably, the displacement sensor assembly includes a base plate and a support plate, the base plate is fixedly connected to the lower end, the support plate is fixedly connected to the cylinder, and a sensor is provided between the base plate and the support plate.

[0008] Preferably, a first through hole is provided at the center of the upper end cover, a second through hole is provided at the center of the lower end cover, a guide tube is provided at the lower end of the second through hole, and the guide tube passes through the upper end surface of the mounting base and extends to the lower side of the upper end surface of the mounting base.

[0009] Preferably, the guide tube is provided with a hanging ear, and the hanging ear is connected to the mounting base via a hexagon socket screw.

[0010] Preferably, a connecting pipe is provided at the bottom end of the guide pipe, and the connecting pipe is connected to the guide pipe via a hexagon socket screw.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model optimizes and transforms the system to realize independent system control, solves the original design defects, realizes the precise control of the system on the speed and load, improves the system control sensitivity, eliminates the dead zone of valve adjustment, prevents the fluctuation of feed water flow, reduces the difficulty of boiler control, reduces energy consumption, reduces the probability of jamming of control hydraulic components, improves the safety of the unit, and achieves the purpose of long-term stable operation;

[0013] 2. The new MEH system can be operated independently, and the modified system control incorporates the original MEH one-button start function to ensure the safe and efficient operation of the unit, meet production needs to the greatest extent, reduce the cost of manual maintenance, and reduce the risks to safe production due to the original equipment and the very limited technical information provided by foreign manufacturers.

[0014] 3. It has broken through foreign technical barriers and reduced the procurement costs of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the module of the utility model;

[0016] Figure 2 It is a schematic diagram of the structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the side section structure of the utility model.

[0018] In the figure: 1, oil station; 2, oil motor; 3, diaphragm valve; 4, accumulator; 5, regeneration device; 6, servo control cabinet; 7, valve control seat; 71, spring chamber assembly; 711, cylinder; 712, upper end cover; 713, lower end cover; 714, spring; 715, inclined surface; 716, second through hole; 717, guide tube; 718, hanging ear; 719, first through hole; 72, mounting base; 73, displacement sensor assembly; 731, bottom plate; 732, support plate; 733, sensor. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figures 1 to 3 The utility model provides a technical solution: a new type of steam turbine feed water pump control system, including an oil station 1, an oil motor 2, a diaphragm valve 3, an accumulator 4, a regeneration device 5 and a servo control cabinet 6, the oil motor 2 is connected to the oil station 1, the oil motor 2 adjusts the diaphragm valve 3 through a regulating valve speed closing valve, the oil motor 2 is connected to the accumulator 4 and the regeneration device 5, the accumulator 4 is connected to the servo control cabinet 6, the regulating valve speed closing valve is provided with a regulating valve operating seat 7, the oil motor 2 includes a feed water pump small machine 21, a frequency converter 22 and a blower 23, each valve is designed with two valve position control cards, respectively controlling the redundant coils of the electro-hydraulic converter on the valve, that is, if one set of control systems fails, the other set of control systems can still meet the control of the hydraulic system, and at the same time, the original double valve common control is changed to independent control of three regulating valves, when one of the valves fails, a special valve position control tool is designed to perform online troubleshooting without affecting the actual load. The utility model is realized by the DCS system. According to the actual use situation, an independent valve position control cabinet is added. The original Siemens AO redundant control signal is directly connected to the valve position control cabinet. The 8 valve position control cards of the control cabinet complete the control of 2 regulating gates, 1 steam supplement valve and 1 balanced steam supplement valve on site. All controls of the newly added MEH oil station are realized by the DCS system. The entire system is the first in China to combine the advantages of four systems: Hollysys, Siemens, Shanghai Xinhua Valve Position Control, and Shanghai Zhidao High-Pressure Fire-resistant Oil System, to achieve precise control of the speed and load of the water feed pump.

[0021] Specifically, the valve control seat 7 includes a spring chamber assembly 71 , a mounting base 72 and a displacement sensor assembly 73 . The spring chamber assembly 71 is arranged on the mounting base 72 , and the displacement sensor assembly 73 is arranged on the spring chamber assembly 71 .

[0022] Specifically, the spring chamber assembly 71 includes a cylinder 711, an upper end cover 712, a lower end cover 713 and a spring 714. The upper end edge of the cylinder 711 is provided with a slope 715, the upper end cover 712 is in active contact with the slope 715, the spring 714 is arranged inside the cylinder 711, and the lower end cover 713 is fixedly connected to the bottom end of the cylinder 711.

[0023] Specifically, the displacement sensor assembly 73 includes a bottom plate 731 and a support plate 732 . The bottom plate 731 is fixedly connected to the lower end cover 713 , the support plate 732 is fixedly connected to the cylinder 711 , and a sensor 733 is provided between the bottom plate 731 and the support plate 732 .

[0024] Specifically, a first through hole 719 is provided at the center of the upper end cover 712, a second through hole 716 is provided at the center of the lower end cover 713, a guide tube 717 is provided at the lower end of the second through hole 716, and the guide tube 717 passes through the upper end surface of the mounting base 72 and extends to the lower side of the upper end surface of the mounting base.

[0025] Specifically, the guide tube 717 is provided with a hanging ear 718, and the hanging ear 718 is connected to the mounting base 72 through a hexagon socket screw.

[0026] Specifically, a connecting pipe is provided at the bottom end of the guide tube 718, and the connecting pipe is connected to the guide tube 718 via a hexagon socket screw.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of steam turbine feed water pump control system, including an oil station, an oil motor, a diaphragm valve, an accumulator, a regeneration device and a servo control cabinet, characterized in that: The oil motor is connected to the oil station, the oil motor adjusts the diaphragm valve through the regulating valve speed closing valve, the oil motor is connected to the accumulator and the regeneration device, the accumulator is connected to the servo control cabinet, the regulating valve speed closing valve is provided with a regulating valve operating seat, and the oil motor includes a water pump small machine, a frequency converter and a blower.

2. A novel turbine feedwater pump control system according to claim 1, characterized in that: The valve adjustment operating seat comprises a spring chamber component, a mounting base and a displacement sensor component. The spring chamber component is arranged on the mounting base, and the displacement sensor component is arranged on the spring chamber component.

3. A novel turbine feedwater pump control system according to claim 2, characterized in that: The spring chamber assembly includes a cylinder, an upper end cover, a lower end cover and a spring. The upper end edge of the cylinder is provided with an inclined surface, the upper end cover is in active contact with the inclined surface, the spring is arranged inside the cylinder, and the lower end cover is fixedly connected to the bottom end of the cylinder.

4. A novel turbine feedwater pump control system according to claim 3, characterized in that: The displacement sensor assembly comprises a bottom plate and a support plate, wherein the bottom plate is fixedly connected to the lower end, the support plate is fixedly connected to the cylinder, and a sensor is arranged between the bottom plate and the support plate.

5. A novel turbine feedwater pump control system according to claim 4, characterized in that: A first through hole is provided at the center of the upper end cover, a second through hole is provided at the center of the lower end cover, a guide tube is provided at the lower end of the second through hole, and the guide tube passes through the upper end surface of the mounting base and extends to the lower side of the upper end surface of the mounting base.

6. A novel turbine feedwater pump control system according to claim 5, characterized in that: The guide tube is provided with a hanging ear, and the hanging ear is connected to the mounting base through a hexagon socket screw.

7. A novel turbine feedwater pump control system according to claim 6, characterized in that: A connecting pipe is provided at the bottom end of the guide pipe, and the connecting pipe is connected to the guide pipe through a hexagon socket screw.

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