CN113358049A

CN113358049A - System and method for monitoring deformation of rigid beam of denitration reactor of power plant on line

Info

Publication number: CN113358049A
Application number: CN202110727872.8A
Authority: CN
Inventors: 陈盛广; 王军民; 邓玲惠; 安付立; 王必宁; 程肖军
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-09-07

Abstract

The invention discloses a system and a method for monitoring deformation of a rigid beam of a denitration reactor of a power plant on line, wherein the system comprises a signal controller, a central processing unit, a plurality of data acquisition units and a plurality of displacement sensors; the system and the method can accurately monitor the deformation of the rigid beam of the inlet flue of the flue gas denitration reactor in real time and can realize timely early warning.

Description

System and method for monitoring deformation of rigid beam of denitration reactor of power plant on line

Technical Field

The invention belongs to the technical field of monitoring, and relates to an on-line monitoring system and method for deformation of a rigid beam of a denitration reactor of a power plant.

Background

The electric energy supply of China mainly takes coal-fired power generation as a main part, a large amount of nitrogen oxides are generated in the coal-fired power generation process, the flue gas denitration becomes a necessary condition for commercial operation of a coal-fired power plant, and the flue gas denitration creates good economic and social benefits for the power plant. Flue gas denitration reactor volume and weight are great, million tower furnace flue gas denitration reactor entry flue length x width x height is about 20 meters x 10 meters x 25 meters, furnace flue gas denitration reactor entry flue casing is sealed by rigid beam and iron plate, flue gas denitration reactor entry flue top rigid beam hang through a plurality of groups gallows with on the boiler steelframe, flue gas denitration reactor entry flue total weight is about 400 more tons, the deposition volume is about 200 tons when the ash bucket is full of the ash volume, the power plant often leads to flue gas denitration reactor rigid beam to warp because of deposition, overload, the fracture reveals etc.. In order to improve the stress safety of the flue gas denitration reactor, technicians need to check the ash deposition amount in the ash bucket through an observation window on site at regular intervals, and once the ash deposition amount is found to be large, the ash deposition in the ash bucket is cleaned. Its disadvantages are represented by: (1) an inlet flue of the flue gas denitration reactor is arranged in the open air and suspended (the elevation is about 90 meters), the whole outer part is sealed by a heat insulation layer, a routing inspection platform is not arranged near the top rigid beam, and the deformation of the rigid beam cannot be inspected when a unit operates. (2) After the unit is shut down, but set up huge unsettled scaffold and demolish rigidity roof beam and keep warm outward and can macroscopically inspect the rigidity roof beam deflection, nevertheless because of ash bucket deposition volume reduces this moment, the rigidity roof beam deflection reduces, can't represent the biggest deflection of rigidity roof beam, more unable early warning, and the work load that the scaffold was set up and the dismouting that keeps warm increases.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an on-line monitoring system and method for the deformation of a rigid beam of a denitration reactor of a power plant.

In order to achieve the purpose, the system for monitoring the deformation of the rigid beam of the denitration reactor of the power plant comprises a signal controller, a central processing unit, a plurality of data acquisition units and a plurality of displacement sensors;

the displacement sensor and the data acquisition unit correspond to a fixed component on a rigid beam of the denitration reactor, the displacement sensor is arranged on the fixed component, the output end of the displacement sensor is connected with the data acquisition unit through a multifunctional cable, and the data acquisition unit is connected with the central processing unit through a signal controller.

The data acquisition unit is adsorbed on the fixed component through the magnetic seat.

The data acquisition unit is connected with the multifunctional cable and the signal controller through the receiving and transmitting device.

And the power supply is used for supplying power to the receiving and transmitting device and the data acquisition unit.

The data acquisition unit is connected with the signal controller in a wireless transmission mode through the receiving and transmitting device.

The displacement sensor is a laser distance meter, an infrared distance meter, a linear displacement sensor, a stay wire displacement sensor or an eddy current displacement sensor;

the power supply is a dry battery, a rechargeable battery, a charger and an external power supply.

The method for monitoring the deformation of the rigid beam of the denitration reactor of the power plant on line comprises the following steps:

the central processing unit measures the distance between the fixed component and the rigid beam in real time by using the displacement sensor through the signal controller and the data acquisition unit, subtracts the distance obtained by current measurement from the distance measured in the initial state, takes the subtraction operation result as the deformation of the rigid beam, and automatically sends out early warning when the deformation of the rigid beam is suddenly changed and exceeds the standard.

The invention has the following beneficial effects:

the system and the method for monitoring the deformation of the rigid beam of the denitration reactor of the power plant have the advantages that during specific operation, the displacement sensor is installed on the fixed component, the central processing unit measures the distance between the fixed component and the rigid beam in real time through the displacement sensor, the deformation of the rigid beam is calculated, when the deformation of the rigid beam is suddenly changed and exceeds the standard, early warning is automatically sent out, the deformation of the rigid beam of the flue at the inlet of the flue gas denitration reactor is accurately monitored in real time, the monitoring data is accurate, real-time and low in cost, and long-term, real-time and intelligent monitoring, evaluation and scientific management of the stress safety of equipment can be realized.

Drawings

FIG. 1a is a schematic structural view of the present invention;

FIG. 1b is a schematic view of the structure at A in FIG. 1a

FIG. 2 is a circuit diagram of the present invention;

fig. 3a is a schematic structural diagram of the displacement sensor 1;

FIG. 3b is a cross-sectional view taken along line A-A of FIG. 3 a;

fig. 4 is a schematic structural diagram of the data acquisition unit 2.

Wherein, 1 is a displacement sensor, 2 is a data acquisition unit, 3 is a signal controller, 4 is a central processing unit, 5 is a rigid beam, 6 is a fixed component, 7 is a multifunctional cable, 8 is a receiving and transmitting device, 9 is a magnetic seat, and 10 is a power supply.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1a to 4, the system for monitoring the deformation of the rigid beam 5 of the denitration reactor of the power plant comprises a displacement sensor 1, a data acquisition unit 2, a signal controller, a central processing unit 4, the rigid beam 5, a fixing member 6, a multifunctional cable 7, a magnetic base 9, a power supply 10 and a receiving and transmitting device 8;

a displacement sensor 1 and a data acquisition unit 2 correspond the fixed component 6 on a denitration reactor rigid beam 5, displacement sensor 1 install in on the fixed component 6, displacement sensor 1's output is connected with data acquisition unit 2 through multifunctional cable 7, and data acquisition unit 2 is connected with central processing unit 4 through signal controller 3.

During operation, the displacement sensor 1 vertically emits laser downwards onto the rigid beam 5 of the denitration reactor, then returns to the displacement sensor 1 to measure the distance between the fixed member 6 and the rigid beam 5, and then subtracts the measured distance from the distance measured in the initial state to obtain the deformation of the rigid beam 5.

The data acquisition unit 2 is adsorbed on the fixing component 6 through the magnetic seat 9, supplies power for the receiving and sending device 8 through the power supply 10, and the data acquisition unit 2 is connected with the displacement sensor 1 and the signal controller 3 through the receiving and sending device 8, wherein the data acquisition unit 2 is connected with the multifunctional cable 7 through the receiving and sending device 8, and the data acquisition unit 2 is connected with the signal controller 3 through the receiving and sending device 8 in a wireless transmission mode.

In addition, it should be noted that the displacement sensor 1 is a laser distance meter, an infrared distance meter, a linear displacement sensor, a pull wire displacement sensor or an eddy current displacement sensor; the displacement sensor 1 and the fixed component 6 are connected in a magnet adsorption, bolt connection or welding mode; the power supply 10 is a dry battery, a rechargeable battery, a charger and an external power supply.

The specific working process of the invention is as follows:

the displacement sensor 1 is fixed on the fixed component 6, the central processing unit 4 measures the distance between the fixed component 6 and the rigid beam 5 in real time by using the displacement sensor 1 through the signal controller 3 and the data acquisition unit 2, subtracting the distance obtained by current measurement from the distance measured in the initial state, taking the subtraction result as the deformation of the rigid beam 5, and when the deformation of the rigid beam 5 is sudden and exceeds the standard, an early warning is automatically sent out, a deformation-time curve graph of the rigid beam 5 is drawn at the same time, when a viewing request sent by a user by using a client is received, the deformation-time curve graph of the rigid beam 5 is sent to a client of a user so that the user can look up the curve graph, monitoring data are accurate, real-time and low in cost, and long-term real-time intelligent monitoring, evaluation and scientific management of the stress safety of the equipment can be realized.

Claims

1. An on-line monitoring system for deformation of a rigid beam of a denitration reactor in a power plant is characterized by comprising a signal controller (3), a central processing unit (4), a plurality of data acquisition units (2) and a plurality of displacement sensors (1);

a displacement sensor (1) and a data acquisition unit (2) correspond fixed component (6) on a denitration reactor rigid beam (5), displacement sensor (1) install in on fixed component (6), the output of displacement sensor (1) is connected with data acquisition unit (2) through multifunctional cable (7), and data acquisition unit (2) are connected with central processing unit (4) through signal controller (3).

2. The power plant denitration reactor rigid beam deformation on-line monitoring system according to claim 1, characterized in that the data acquisition unit (2) is adsorbed on the fixing member (6) through a magnetic seat (9).

3. The system for monitoring the deformation of the rigid beam of the denitration reactor of the power plant as claimed in claim 1, wherein the data acquisition unit (2) is connected with the multifunctional cable (7) and the signal controller (3) through a receiving and transmitting device (8).

4. The system for monitoring the deformation of the rigid beam of the denitration reactor in the power plant as claimed in claim 1, further comprising a power supply (10) for supplying power to the receiving and transmitting unit (3) and the data acquisition unit (2).

5. The system for monitoring the deformation of the rigid beam of the denitration reactor of the power plant as claimed in claim 1, wherein the data acquisition unit (2) is connected with the signal controller (3) in a wireless transmission manner through a receiving and transmitting device (8).

6. The power plant denitration reactor rigid beam deformation online monitoring system of claim 1, characterized in that the displacement sensor (1) is a laser range finder, an infrared range finder, a linear displacement sensor, a stay wire displacement sensor or an eddy current displacement sensor.

7. The power plant denitration reactor rigid beam deformation on-line monitoring system according to claim 4, characterized in that the power supply (10) is a dry battery, a rechargeable battery, a charger or an external power supply.

8. An on-line monitoring method for deformation of a rigid beam of a denitration reactor of a power plant is characterized in that the on-line monitoring system for deformation of the rigid beam of the denitration reactor of the power plant based on claim 1 comprises the following steps:

the central processing unit (4) measures the distance between the fixed component (6) and the rigid beam (5) in real time by using the displacement sensor (1) through the signal controller (3) and the data acquisition unit (2), subtracts the currently measured distance from the measured distance in the initial state, takes the subtraction operation result as the deformation of the rigid beam (5), and automatically sends out early warning when the deformation of the rigid beam (5) is suddenly changed and exceeds the standard.