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A method and circuit for calibrating the temperature signal of the secondary reheat steam temperature in a thermal power plant

A technology of secondary reheating and temperature signal, used in thermometer testing/calibration, limiting amplitude with diodes, thermometers, etc. It can solve the problems of not considering signal errors and inaccurate signals, so as to improve accuracy and ensure signals The effect of frequency

Active Publication Date: 2020-11-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The principle of the secondary reheating of the thermal power plant is consistent with the above, but the existing method does not take into account the signal error when the signal of the secondary reheating steam temperature of the thermal power plant is transmitted to the secondary reheating steam temperature control terminal of the thermal power plant, which will cause the secondary reheating of the thermal power plant. The signal sent by the reheat steam temperature control terminal is not accurate when controlling the secondary reheat steam temperature

Method used

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  • A method and circuit for calibrating the temperature signal of the secondary reheat steam temperature in a thermal power plant

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Embodiment 1

[0048] see figure 1 According to an embodiment of the present invention, a circuit for calibrating the temperature signal of the secondary reheated steam in a thermal power plant includes: a temperature acquisition circuit, a feedback noise reduction circuit, and an operational amplifier output circuit.

[0049] The temperature acquisition circuit uses the temperature collector J1 of the model MB1TH1 to collect the temperature signal of the secondary reheating steam temperature of the thermal power plant.

[0050] The feedback noise reduction circuit uses the diode D2 to the diode D5 and the capacitor C3 to the capacitor C5 to form a limiting frequency modulation circuit to symmetrically limit the signal and at the same time play a role in frequency selection; among them, the transistor Q1 detects the output signal of the limiting frequency modulation circuit and the operational amplifier The potential difference of the AR1 output signal, and the noise reduction circuit compos...

Embodiment 2

[0053] On the basis of Embodiment 1, the operational amplifier output circuit uses the operational amplifier AR1 to amplify the signal in phase and then outputs it, which is the temperature calibration signal of the secondary reheating steam temperature control terminal of the thermal power plant; specifically, the in-phase input of the operational amplifier AR1 One end of the resistor R5 is connected, the other end of the resistor R5 is connected to the positive pole of the diode D4, the inverting input of the operational amplifier AR1 is connected to the resistor R6 and one end of the resistor R7, the other end of the resistor R6 is grounded, and the other end of the resistor R7 is connected to the op amp. The output terminal of the amplifier AR1 and the base of the triode Q1, one end of the resistor R8, and the other end of the resistor R8 are connected to the signal output port; the temperature acquisition circuit is selected as the temperature collector J1 of the MB1TH1 mod...

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Abstract

The invention discloses a method and a circuit used for temperature signal calibration of double-reheat steam temperature of a thermal power plant. The circuit includes: a temperature collection circuit, which is used for collecting a temperature signal of the double-reheat steam temperature of the thermal power plant; a feedback noise reduction circuit, which is used for symmetrical amplitude limiting and frequency selection on the temperature signal collected by the temperature collection circuit; and an operational amplifier output circuit, which is used for carrying out in-phase amplification and output on a signal, which is output by the feedback noise reduction circuit, to obtain a temperature calibration signal of a double-reheat steam temperature control terminal of the thermal power plant. According to the method and the circuit of the invention, the temperature signal of the double-reheat steam temperature of the thermal power plant can be monitored in real time, the signal after adjustment is converted into the temperature calibration signal of the control terminal, and accuracy can be improved.

Description

technical field [0001] The invention belongs to the technical field of circuits and the technical field of temperature signal calibration of secondary reheating steam in thermal power plants, and in particular relates to a method and circuit for calibrating temperature signals of secondary reheating steam in thermal power plants. Background technique [0002] At present, a system and method for reheating steam temperature control of a double reheat unit with overall control of "leveling and combination" (application number is CN201810780423.8), discloses a reheating steam temperature control system and method of "leveling and combination" overall control of a double reheating unit. A hot steam temperature control system and method, the system includes: a flue gas recirculation system to realize the overall main adjustment of the reheated steam temperature; a burner swing angle to realize dynamic acceleration adjustment of the steam temperature control; a flue gas baffle to ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K15/00H03G11/02H03H11/04
CPCG01K15/005H03G11/02H03H11/04
Inventor 贠卫国党宁张英坤王博井小浩
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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