Portable steam turbine generator unit drying air-blast system

Abstract

The invention relates to a portable steam turbine generator unit drying air-blast system which comprises a portable drying air blower, an electric control system and an auxiliary component, and the portable drying air blower is connected with a steam turbine generator unit and used for compressing air and increasing the temperature to the drying temperature needed by blades of the steam turbine generator unit; the electric control system is connected with the drying blower and used for controlling starting, stopping and rotating speed of the drying blower and monitoring operation conditions and states of the drying blower. And the auxiliary component is used for providing gas pipeline transportation, temperature and pressure monitoring, air filtering and gas-water separation. The air blower is utilized to pressurize and heat the air to reduce the relative humidity of the air, and water drops on the blades of the steam turbine generator unit are purged and dried; the drying air blower is small in size, light in weight, capable of being carried by a single person, capable of being lifted to a use scene from a steam turbine generator unit room storage rack, small in occupied area and easy to put in order. Compared with a traditional centrifugal fan power distribution heater drying air-blast system, the drying air-blast system is more energy-saving, more integrated, more reliable and more economical.

Description

Technical Field

[0001] The invention relates to a portable steam turbine generator set drying system, in particular to a portable steam turbine generator set drying and blowing system. Background Art

[0002] During the expansion power generation process, the steam turbine generator set usually enters a two-phase flow state where gas and liquid coexist due to the lower saturated steam pressure. After shutdown, a large number of liquid droplets often adhere to the blade surface. Figure 1 As shown, most of the steam turbine generator sets and related equipment are made of carbon steel. In the atmospheric environment, the metal surface is moist and easily causes oxidation corrosion. If no maintenance measures are taken after shutdown, it will cause corrosion of the turbine generator blades, flow-through parts, etc., reducing the material strength and service life. Each steam turbine generator set costs over 100 million yuan. The impeller blades, as the core component of the generator set, cost nearly 10 million yuan. If no maintenance is performed during the shutdown process, the potential failure threat caused by corrosion and its economic losses are huge. At present, there are mainly three maintenance options for steam turbine generator sets during shutdown at home and abroad:

[0003] (1) Maintenance by blowing dry air to reduce air humidity to slow down corrosion;

[0004] (2) Maintenance and corrosion prevention by filling the equipment with nitrogen to isolate the humid air;

[0005] (3) Wet maintenance by filling with water that meets chemical specifications to slow down corrosion;

[0006] Foreign steam turbine generator unit shutdown maintenance measures all have the above three methods. Domestic steam turbine generator units take into account economic cost, simplicity, and convenient maintenance. The main method is "fan + heater" (see Figure 2 ) Ventilation and drying maintenance is the main method, which sends dry hot air into the cylinder of the cooled steam turbine generator set to purge and use the low relative humidity to remove droplets on the impeller surface, thereby keeping the oxygen corrosion rate of the rotor parts in the cylinder at an extremely low level. Summary of the invention

[0007] The present invention is to provide a novel portable steam turbine generator set drying and blowing system, the purpose of which is to send dry hot air into the cylinder of the cooled steam turbine generator set, to purge and facilitate the low relative humidity to take away the droplets on the impeller surface, to maintain the low relative humidity environment of the rotor parts in the cylinder through dry blowing maintenance, to keep the oxygen corrosion rate at an extremely low level, to delay the service life of the impeller blades and flow-through parts in the cylinder of the steam turbine generator set, and to reduce the loss caused by corrosion to the steam turbine generator set.

[0008] To achieve the above-mentioned purpose, the technical solution of the present invention is: a portable steam turbine generator set drying and blowing system, including a portable drying blower, an electronic control system and auxiliary components, the portable drying blower is connected to the steam turbine generator set, and is used to compress the air and increase the temperature to the drying temperature required for the blades of the steam turbine generator set; the electronic control system is connected to the drying blower, and is responsible for controlling the start and stop, speed of the drying blower, and monitoring the operating conditions and status of the drying blower; the auxiliary components are used to provide gas pipeline transportation, temperature, pressure monitoring, air filtration, and gas-water separation.

[0009] Furthermore, the portable drying blower adopts a high-speed, small, integrated, oil-free, double-rotor twisted-blade Roots structure, which is easy for one person to carry and convenient for maintenance and replacement; the gas medium does not contain oil and uses air compression to increase the temperature.

[0010] Furthermore, the portable drying blower is composed of a naturally cooled high-speed motor, a rotor, a casing, a synchronous gear, an air seal, an oil seal, and a bearing seat. The naturally cooled high-speed motor is directly connected to the active rotor, and the synchronous gear drives the driven rotor to rotate in reverse meshing. A variable volume cavity that changes with the rotation angle is formed under the envelope of the casing and the end cover, continuously inhaling air to compress it and increase the temperature.

[0011] Furthermore, the electric control system is a small electric control system integrating a voltage conversion module, a communication module, a frequency conversion module, an interaction module, a control acquisition module, and a CPU processing chip.

[0012] Furthermore, the electronic control system adopts a waterproof and dustproof aviation plug structure, in which the transformer module is AC / DC / AC or DC / AC; the communication module is CAN communication or RS485 communication; the interactive module includes analog-to-digital and digital-to-analog conversion, and has a drying timing function, and the equipment automatically shuts down when the set exit time is reached; the control acquisition module collects AC or DC current values, AC or DC voltage values, speed, motor winding temperature, system operating conditions, and is linked to the start and stop of the solenoid valve.

[0013] Furthermore, the auxiliary components include an air-water separator, an air intake filter, pipelines and interface components, a check valve, an electromagnetic and manual stop valve, and a sensor. The air intake filter is connected to the dry blower to filter solid impurity particles in harsh environments. The built-in pressure difference sensor provides an alarm to remind maintenance personnel to replace the filter element; the check valve is arranged on the connecting pipeline between the dry blower and the steam turbine generator set to prevent the backflow of droplets and airflow inside the pipeline after the dry blower is shut down, which may affect the motor and the control system; the bypass valve is connected to the steam turbine generator set to release the cylinder and pipeline pressure in the steam turbine generator set; the electromagnetic and manual stop valve are connected to the connecting pipeline between the steam turbine generator set and the air-water separator, and the manual stop valve is normally open for maintenance and replacement of the electromagnetic valve; the electromagnetic valve is used to work in conjunction with the dry blower to open and close the drying system pipeline to discharge humid air; the air-water separator is used to separate water and air in the humid air, and discharge them to the atmosphere and the water collection tank / water diversion tank respectively.

[0014] Beneficial effects of the present invention:

[0015] The present invention uses a novel portable steam turbine generator set drying and blowing system to pressurize and heat the air to reduce the relative humidity of the air, which can sweep away water droplets on the blades of the steam turbine generator set and keep it relatively dry, greatly delaying the service life of the rotor components and flow-through components of the steam turbine generator set and reducing the economic losses caused by corrosion to materials.

[0016] The drying blower in the system of the present invention is small in size, light in weight, and can be carried by one person. It can be carried from the storage shelf in the steam turbine generator room to the use scene, occupies a small area, and is easy to place neatly; the drying blower outlet only needs to be quickly connected to the interface through a high-temperature resistant silicone hose through a clamp, which is easy to operate.

[0017] After the electric control system of the present invention is powered on, the drying blower can be started and stopped with one button, the system operating conditions and the drying blower operating status can be monitored in real time, and a built-in fault alarm can be set for shutdown; the electric control system has a host control system interface, which can provide real-time feedback to the host system, and can be directly remotely controlled by the host system or linked with the shutdown of the steam turbine generator set, thereby improving the intelligence, standardization, modularity and independence of the electric control system; the linkage between the electric control system and the solenoid valve can improve the operability of the operator and facilitate use by the user.

[0018] The present invention adopts a new type of electromechanical integrated Roots blower structure, which is more integrated than the traditional centrifugal fan power heater drying and blowing system; the twisted blade rotor structure is adopted to improve the internal compression ratio, and the temperature of the air is increased during the compression process, making the system more energy-efficient; the new drying blower adopts an integrated design, which reduces the parts of the equipment and makes the entire system more reliable and more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the corrosion of the turbine generator rotor;

[0020] Figure 2 This is a schematic diagram of a conventional steam turbine generator drying system;

[0021] Figure 3 It is a schematic diagram of a drying system for a steam turbine generator set of the present invention;

[0022] Figure 4 It is the schematic diagram of the drying blower;

[0023] Figure 5 Schematic diagram of the drying blower electronic control system. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] like Figure 3 As shown, a novel portable steam turbine generator set drying and blowing system of the present invention comprises an air intake filter 1, a drying blower 2, a check valve 3, a bypass valve 4, a steam turbine generator set cylinder 5, a manual stop valve 6, a solenoid valve 7, and an air-water separator 8. The air intake filter 1 is used to filter solid impurity particles in a harsh environment, and a built-in pressure difference sensor can alarm and remind maintenance personnel to replace the filter element; the drying blower 2 is the core equipment of the system, which is used to compress the air to increase the temperature, reduce the relative humidity of the air, and provide new dry air and power source for the drying and blowing system; the check valve 3 is used to prevent the backflow of liquid droplets and airflow inside the pipeline after the drying blower 2 stops, which may affect the motor and the control system; the bypass valve 4 is used to release the cylinder and pipeline pressure in the steam turbine generator set 5; the steam turbine generator set 5 is the object to be dried, and the drying blower system needs to ensure a low relative humidity environment inside the drying object; the stop valve 6 is normally open and is mainly used to repair and replace the solenoid valve 7; the solenoid valve 7 is used to work in conjunction with the drying blower 2 to open and close the drying system pipeline to discharge the wet air; the air-water separator 8 is used to separate the water and air in the wet air and discharge them to the atmosphere and the water collection tank / water diversion tank respectively.

[0026] like Figure 4 (a), (b), (c) and Figure 5 As shown in (a) and (b), the drying blower 2 is composed of mechanical parts ( Figure 4 (a), (b), (c)) and electronic control system ( Figure 5The drying blower 2 is composed of two parts (a) and (b). The drying blower 2 adopts a high-speed, small, integrated, oil-free, twisted blade double-rotor Roots structure. The motor is directly connected to the active rotor, and the driven rotor is driven by the synchronous gear to mesh in the opposite direction. A variable volume cavity that changes with the rotation angle is formed under the envelope of the shell and the end cover, which continuously inhales air for compression and increases the temperature. The electronic control system is a small electronic control system that integrates modules such as transformer module, communication module, frequency conversion module, interaction module, control acquisition module, and CPU processing chip. The electronic control system adopts a waterproof and dustproof aviation plug-in structure, in which the transformer module is AC / DC / AC or DC / AC, which can be used in scenarios with different power supply requirements; the communication module is CAN communication or RS485 communication, which is widely compatible with the upper control systems of land-based and water-based steam turbine generator sets; the interactive module includes analog-to-digital and digital-to-analog conversion, and can implement interactive communication with the PC or host computer; the electronic control system has a drying timing function, and the equipment automatically shuts down when the set running time is reached, which improves the functionality of the system and prevents operators from forgetting; the control acquisition module can collect AC or DC current values, AC or DC voltage values, speed, motor winding temperature, system operating conditions, etc., and start and stop linkage with the solenoid valve.

Claims

1. A portable steam turbine generator drying and blowing system, characterized in that: It includes a portable dry blower, an electronic control system and auxiliary components. The portable dry blower is connected to the steam turbine generator set to compress the air and raise its temperature to the drying temperature required for the blades of the steam turbine generator set; the electronic control system is connected to the dry blower to control the start and stop, speed of the dry blower, and monitor the operating conditions and status of the dry blower; the auxiliary components are used to provide gas pipeline transportation, temperature, pressure monitoring, air filtration, and gas-water separation.

2. The portable steam turbine generator drying and blowing system according to claim 1 is characterized in that: The portable drying blower adopts a high-speed, small, integrated, oil-free, double-rotor twisted-blade Roots structure, which is easy for one person to carry and convenient for maintenance and replacement; the gas medium does not contain oil and uses air compression to increase the temperature.

3. The portable steam turbine generator drying and blowing system according to claim 2 is characterized in that: The portable drying blower consists of a naturally cooled high-speed motor, rotor, housing, synchronous gear, air seal, oil seal, and bearing seat. The naturally cooled high-speed motor is directly connected to the active rotor, and the synchronous gear drives the driven rotor to mesh in the opposite direction, forming a variable volume cavity that changes with the rotation angle under the envelope of the housing and the end cover, continuously inhaling air for compression and increasing the temperature.

4. The portable steam turbine generator drying and blowing system according to claim 1, characterized in that: The electronic control system is a small electronic control system that integrates a voltage conversion module, a communication module, a frequency conversion module, an interaction module, a control acquisition module, and a CPU processing chip.

5. The portable steam turbine generator drying and blowing system according to claim 4 is characterized in that: The electronic control system adopts a waterproof and dustproof aviation plug-in structure, in which the transformer module is AC / DC / AC or DC / AC; the communication module is CAN communication or RS485 communication; the interactive module includes analog-to-digital and digital-to-analog conversion, and has a drying timing function. When the set exit time is reached, the equipment automatically shuts down; the control acquisition module collects AC or DC current values, AC or DC voltage values, speed, motor winding temperature, system operating conditions, and is linked to the start and stop of the solenoid valve.

6. The portable steam turbine generator drying and blowing system according to claim 1, characterized in that: Auxiliary components include gas-water separator, air intake filter, pipeline and interface components, check valve, electromagnetic and manual stop valve, and sensor. The air intake filter is connected to the dry blower to filter solid impurity particles in harsh environments. The built-in pressure difference sensor alarms and reminds maintenance personnel to replace the filter element; the check valve is set on the connecting pipeline between the dry blower and the steam turbine generator set to prevent the backflow of droplets and airflow inside the pipeline after the dry blower is shut down, which may affect the motor and control system; the bypass valve is connected to the steam turbine generator set to release the cylinder and pipeline pressure in the steam turbine generator set; the electromagnetic and manual stop valve are connected to the connecting pipeline between the steam turbine generator set and the gas-water separator, and the manual stop valve is normally open for maintenance and replacement of the electromagnetic valve; the electromagnetic valve is used to work in conjunction with the dry blower to open and close the drying system pipeline to discharge humid air; the gas-water separator is used to separate water and air in the humid air and discharge them to the atmosphere and the water collection tank / water diversion tank respectively.

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