A self-generating multi-information sensor suitable for use in a pneumatic ash conveying system of a power plant

Abstract

The present application relates to the technical field of power plant pneumatic ash conveying, in particular to a self-power generation type multi-information sensor suitable for the pneumatic ash conveying system of a power plant. The impeller is installed on the rotating shaft of the low-speed wheel of the gearbox arranged in the ash conveying pipeline, the rotating shaft of the high-speed wheel is connected with the rotor of the generator, the stator of the generator is installed on the gearbox, the rotor is located in the stator, the wiring end of the generator is connected with the controller, the controller is connected with the information collection device through the AD conversion module, and the controller is connected with the monitoring system through the RS485 bus. The present application does not use system power supply, completely utilizes the high-temperature, high-pressure and high-speed airflow inside the pneumatic ash conveying system to drive the impeller to rotate, the impeller further drives the rotor to rotate to make the generator self-power supply, saves the installation of the local cabinet, saves the power cable, utilizes the high-speed airflow at the end of the pipeline to make the information collector at the end also obtain reliable voltage supply and stable work.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pneumatic ash conveying technology in power plant. BACKGROUND

[0002] For the pneumatic ash conveying system in power plant, it is very important to install gas pressure, wind speed and temperature sensors at different positions in the ash conveying pipeline for monitoring whether the ash conveying pipeline system is congested, dynamically controlling the power of air compressor and daily maintenance. In the prior art, in order to collect the gas pressure, wind speed and temperature data in the pipeline, a pressure sensor, a wind speed sensor and a temperature sensor need to be installed respectively, and power supply wires need to be used.

[0003] In the long-distance pneumatic ash conveying system, in order to comprehensively understand the pressure value, wind speed and temperature value of each link in the pipeline, a large number of sensors need to be installed, and a large number of local electric control cabinets need to be installed for power supply of the sensors, and three types of pressure, wind speed and temperature sensors need to be installed. In long-distance power supply, the energy loss caused by the resistance of the wire itself is also very large, which causes large power loss of the power supply, which affects the working voltage of the end sensor. The more sensors matched, the more power consumed, which often makes the end sensor instrument unstable, resulting in that reliable data cannot be provided for the system. If thick wire power cables are used, the cost will inevitably be increased. Therefore, there is a dilemma that either a large number of control cabinets need to be installed or thick power supply wires need to be installed, and the information collection is single and three types of data of gas pressure, wind speed and temperature value in the pipeline cannot be collected at the same time. SUMMARY

[0004] In order to solve the technical problem that the energy loss caused by the resistance of the wire itself is large in long-distance power supply, which affects the working voltage of the end sensor in the prior art, the present application provides a self-power generation type multi-information sensor suitable for the pneumatic ash conveying system in power plant.

[0005] The technical scheme adopted by the present application to achieve the above-mentioned purpose is as follows:

[0006] A self-power generation type multi-information sensor suitable for the pneumatic ash conveying system in power plant is characterized in that a impeller 4 is installed on the rotating shaft of the low-speed wheel 2 of a gearbox 1 arranged in the ash conveying pipeline, the rotating shaft of the high-speed wheel 3 is connected to the rotor 6 of a generator 5, the stator 7 of the generator 5 is installed on the gearbox 1, the rotor 6 is located in the stator 7, the wiring end of the generator 5 is connected to a controller 8, the controller 8 is connected to an information collection device through an AD conversion module, and the controller 8 is connected to a monitoring system.

[0007] The first branch 16 is provided with a super capacitor 9, two telescopic rods 11 are transversely installed on the gearbox 1, the stator 7 is connected with the telescopic end of the telescopic rod 11, the spring 12 is installed on the telescopic rod 11 between the gearbox 1 and the stator 7, the controller 8 is connected with the electromagnet 10 through a coil control module, the electromagnet 10 is installed in the shell of the generator 5 and located in the sliding direction of the stator 7, the groove-shaped photoelectric switch 13 is installed in the gearbox 1 corresponding to the low-speed wheel 2, and the groove-shaped photoelectric switch 13 is connected with the controller 8 through a code reading module.

[0008] The wiring end of the generator 5 is connected with the first branch 16 and the second branch 17 through a bridge rectifier circuit and a filter circuit, the first branch 16 and the second branch 17 are connected with a voltage acquisition device through a voltage stabilizing filter circuit, and the voltage acquisition device is connected with the controller 8 through an AD conversion module.

[0009] The information collection device comprises a pressure sensor 14 and a temperature sensor 15.

[0010] The controller 8 is connected with a monitoring system through an RS485 bus.

[0011] Compared with the prior art, the self-power generation type multi-information sensor suitable for the pneumatic ash conveying system of a power plant has the following advantages:

[0012] The self-power generation type multi-information sensor suitable for the pneumatic ash conveying system of a power plant is characterized in that a generator is installed in the ash conveying pipeline of the pneumatic ash conveying system, the high-temperature, high-pressure and high-speed airflow in the pneumatic ash conveying system is used to drive the micro generator to supply power, the on-site cabinet is saved, the power cable is saved, the high-speed airflow at the end of the pipeline is used to enable the information collector at the end to reliably generate power and stably work, the integrated collection of three important parameters of gas pressure, wind speed and temperature is realized, and the remote transmission function is provided. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a principle diagram of the self-power generation type multi-information sensor suitable for the pneumatic ash conveying system of a power plant.

[0014] In the drawing: 1, gearbox; 2, low-speed wheel; 3, high-speed wheel; 4, impeller; 5, generator; 6, rotor; 7, stator; 8, controller; 9, super capacitor; 10, electromagnet; 11, telescopic rod; 12, spring; 13, groove-shaped photoelectric switch; 14, pressure sensor; 15, temperature sensor; 16, first branch; 17, second branch. DETAILED DESCRIPTION

[0015] The self-power generation type multi-information sensor suitable for the pneumatic ash conveying system of a power plant provided by the application comprises a gearbox 1, a low-speed wheel 2, a high-speed wheel 3, an impeller 4, a generator 5, a rotor 6, a stator 7, a controller 8, a super capacitor 9, an electromagnet 10, a telescopic rod 11, a spring 12, a groove-shaped photoelectric switch 13, a pressure sensor 14 and a temperature sensor 15. Figure 1The low-speed wheel 2 of the gearbox 1 installed in the ash conveying pipeline is provided with an impeller 4, and the power plant pneumatic ash conveying pipeline is mainly composed of coal powder and air during operation, the pressure level is generally between 1-3 MPa, the temperature level is generally between 150-400 DEG C, and the flow rate is generally between 15-30 m / s. In order to adapt to the work in such high temperature, high pressure and high speed airflow, the impeller of the device is designed by using high temperature resistant, wear resistant and light weight molybdenum alloy and nickel-based alloy material, the rotating shaft of the high-speed wheel 3 is connected with the rotor 6 of the generator 5, two telescopic rods 11 are transversely installed on the gearbox 1, the stator 7 of the generator 5 is connected with the telescopic end of the telescopic rod 11, the spring 12 is installed on the telescopic rod 11 between the gearbox 1 and the stator 7, the wiring end of the generator 5 is connected with the first branch 16 and the second branch 17 through the bridge rectifier circuit and the filter circuit, the first branch 16 and the second branch 17 are connected with the voltage acquisition device through the voltage stabilizing filter circuit, the voltage acquisition device is connected with the controller 8 through the AD conversion module, the super capacitor 9 is arranged on the first branch 16, the controller 8 is connected with the electromagnet 10 through the coil control module, the electromagnet 10 is installed in the shell of the generator 5 and located in the sliding direction of the stator 7, the controller 8 is connected with the information collection device through the AD conversion module, the information collection device includes the pressure sensor 14 and the temperature sensor 15, the controller 8 is connected with the monitoring system through the RS485 bus, the groove type photoelectric switch 13 is installed in the gearbox 1 corresponding to the low-speed wheel 2, and the groove type photoelectric switch 13 is connected with the controller 8 through the code reading module.

[0016] Working principle: when working, the airflow in the ash conveying pipeline blows the impeller 4 to rotate, the impeller 4 further drives the high-speed wheel 3 to rotate through the low-speed wheel 2, and further makes the rotor 6 of the generator 5 rotate, the generator 5 generates electric energy, and after bridge rectification and RC filtering, part of the electric energy is stored in the super capacitor 9 through the first branch 16, and the other part supplies power to the voltage acquisition device and the controller 8 through the second branch 17, when the generator 5 generates electricity, the super capacitor 9 is charged, the first branch 16 is equivalent to a circuit breaker, the generator 5 supplies power to the controller 8 through the second branch 17, when the controller 8 detects that the voltage of the super capacitor 9 reaches 20v, the controller 8 collects the gas pressure value and temperature value in the ash conveying pipeline through the pressure sensor 14 and the temperature sensor 15; in order to accurately collect the wind speed in the ash conveying pipeline, the impeller 4 should be rotated without load, therefore, when it is detected that the super capacitor reaches 36v, the MCU controller 8 supplies power to the coil on the electromagnet 10 through the solid-state relay with good isolation effect, according to the magnetic field generated by electromagnetic induction, the electromagnet 10 moves the stator 7 to the direction of the electromagnet 10 under the action of the electromagnetic field, so that the stator 7 is separated from the rotor 6, the generator 5 is out of the power generation state, and the rotor 6 moves freely with the wind power, at this time, the slot photoelectric switch 13 is used to collect the rotating speed of the low-speed wheel 2, and after conversion through the MCU controller 8, the wind speed in the ash conveying pipeline is obtained, the controller 8 sends the collected pressure, temperature and wind speed values to the monitoring system through the RS485 bus, because the rotor 6 of the generator 5 is separated from the stator 7, and loses the power generation capacity, at this time, the second branch 17 is equivalent to a circuit breaker, the super capacitor 9 supplies power to the controller 8 through the first branch 16, and consumes the storage energy of the super capacitor 9, with the consumption of the energy stored in the super capacitor 9, the current flowing through the coil on the electromagnet 10 is weakened, the stator 7 returns to the original position under the action of the spring 12, and the generator 5 continues to generate electricity under the action of the wind power in the ash conveying pipeline.

[0017] The present application is described by embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the present application without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present application.

Claims

1. A self-generating multi-information sensor suitable for use in pneumatic ash conveying systems in power plants, characterized in that, An impeller (4) is installed on the shaft of the low-speed wheel (2) of the gearbox (1) located in the ash conveying pipeline. The impeller (4) drives the high-speed wheel (3) to rotate through the low-speed wheel (2). The shaft of the high-speed wheel (3) is connected to the rotor (6) of the generator (5). The stator (7) of the generator (5) is installed on the gearbox (1). The rotor (6) is located inside the stator (7). The terminals of the generator (5) are connected to the controller (8). The controller (8) is connected to the information collection device through the AD conversion module. The controller (8) is connected to the monitoring system. The generator (5) has a first branch (16) and a second branch (17) between its terminals and the controller (8). The first branch (16) has a supercapacitor (9). Two telescopic rods (11) are installed laterally on the gearbox (1). The stator (7) is connected to the telescopic end of the telescopic rod (11). A spring (12) is installed on the telescopic rod (11) between the gearbox (1) and the stator (7). The controller (8) is connected to an electromagnet (10) through a coil control module. The electromagnet (10) is installed inside the housing of the generator (5) and is located in the lateral sliding direction of the stator (7). A slotted photoelectric switch (13) is installed inside the gearbox (1) corresponding to the low-speed wheel (2). The slotted photoelectric switch (13) is connected to the controller (8) through an encoding reading module.

2. The self-generating multi-information sensor suitable for pneumatic ash conveying systems in power plants according to claim 1, characterized in that, The terminals of the generator (5) are connected to the first branch (16) and the second branch (17) through a bridge rectifier circuit and a filter circuit. The generator (5) generates electrical energy, which is then rectified by a bridge rectifier and filtered by an RC filter. Part of the energy is stored in the supercapacitor (9) through the first branch (16), and the other part is supplied to the voltage acquisition device and the controller (8) through the second branch (17). The first branch (16) and the second branch (17) are connected to the voltage acquisition device through a voltage stabilizing filter circuit. The voltage acquisition device is connected to the controller (8) through an AD conversion module.

3. The self-generating multi-information sensor suitable for pneumatic ash conveying systems in power plants according to claim 1, characterized in that, The information collection device includes a pressure sensor (14) and a temperature sensor (15).

4. The self-generating multi-information sensor suitable for pneumatic ash conveying systems in power plants according to claim 1, characterized in that, The controller (8) is connected to the monitoring system via an RS485 bus.

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