CN113685809A - CFB boiler raw coal bunker fire alarm device - Google Patents

CFB boiler raw coal bunker fire alarm device Download PDF

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CN113685809A
CN113685809A CN202110978891.8A CN202110978891A CN113685809A CN 113685809 A CN113685809 A CN 113685809A CN 202110978891 A CN202110978891 A CN 202110978891A CN 113685809 A CN113685809 A CN 113685809A
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resistor
signal
raw coal
coal bunker
terminal
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牟雪梅
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/06—Fire prevention, containment or extinguishing specially adapted for particular objects or places of highly inflammable material, e.g. light metals, petroleum products
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/24—Reminder alarms, e.g. anti-loss alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems

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  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

The invention discloses a fire alarm device for a raw coal bunker of a CFB (circulating fluid bed) boiler, which effectively solves the problem of resource waste caused by the gas detection of the raw coal bunker in the prior art and the mode of immediately starting to cool down the raw coal bunker when gas is detected.

Description

CFB boiler raw coal bunker fire alarm device
Technical Field
The invention relates to the field of raw coal bunkers, in particular to a fire alarm device for a raw coal bunker of a CFB boiler.
Background
A raw coal bunker (fig. 1 is a raw coal bunker structure diagram, and fig. 1 is a raw coal bunker) is an important component of a power station, and among them, a raw coal bunker of a CFB (circulating fluidized bed) boiler is one of them. Through the research of experts, the coal generates carbon monoxide CO in the low-temperature oxidation process and the temperature of the coal rises, if the phenomenon is left alone, the ethylene C is generated along with the increase of the temperature2H4The fire of the raw coal bunker is easily caused, the safety of the raw coal bunker of the CFB boiler is greatly reduced, and therefore, carbon monoxide CO and ethylene C2H4Gradually becoming the index gas for measuring the low-temperature oxidation of the raw coal bunker.
In the prior art, a CO sensor and an ethylene sensor are utilized to respectively detect the occurrence of carbon monoxide, CO and ethylene C in a raw coal bunker2H4When the CO sensor detects CO gas, the cooler is immediately started to cool the raw coal bunker, and simultaneously the ethylene sensor in the ethylene detection circuit is used for detecting ethylene C2H4When ethylene C is detected2H4The emergency protector is started immediately, although the safety of the raw coal bunker is improved to a certain extent, the mode has the problem that the problem of resource waste is caused by the fact that the ethylene detection circuit and the cooler are started at the moment when the CO sensor detects CO gas but does not cause the temperature rise of the raw coal bunker, namely the concentration of the CO gas is still below a normal standard threshold value, and the cooling work of the cooler is also made ineffective.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a fire alarm device for a raw coal bunker of a CFB boiler, which effectively solves the problem of resource waste caused by the manner that the gas of the raw coal bunker is detected and the temperature is immediately reduced when the gas is detected in the prior art.
The technical scheme of its solution is, a raw coal bunker fire alarm device of CFB boiler, alarm device includes temperature detection circuit, signal detection circuit, temperature detection circuit utilizes temperature sensor U1 to detect the temperature signal in the raw coal bunker to utilize the CO signal that detects to open the cooler behind calculator and the judger, and delay opening signal detection circuit simultaneously, signal detection circuit utilizes ethylene sensor U5 to detect the ethylene signal in the raw coal bunker and produce alarm signal, with alarm signal transmission to the surveillance center, and start emergency alarm simultaneously.
Further, the temperature detection circuit comprises a temperature sensor U1, a calculator and a judger, the calculator performs subtraction operation on the temperature signal detected by the temperature sensor U1 to obtain a difference signal, the difference signal conducts the cooler through an AND gate U4A in the judger, and meanwhile the signal detection circuit is started in a delayed mode.
Further, the calculator comprises a resistor R1, one end of a resistor R1 is connected with an out pin of a temperature sensor U1, the other end of the resistor R1 is connected with one end of a resistor R2, the upper end of an adjustable resistor R4 and the gate of a field-effect tube Q1, the drain of the field-effect tube Q1 is connected with the other end of the resistor R2 and the VCC pin of the temperature sensor U1 respectively and is connected with a positive power supply VCC, the source of the field-effect tube Q1 is connected with one end of a resistor R5 and one end of a resistor R3 respectively, the other end of the resistor R5 is connected with one end of a resistor R6 and the same-phase end of an operational amplifier U2B respectively, the inverting end of the operational amplifier U2B is connected with one end of the resistor R8, the other end of the resistor R8 is connected with a standard signal, and the other end of an electrical fault R3 is connected with the other end of the resistor R6, the adjustable resistor R4, the lower end of the adjustable resistor R4 and the gnd pin of the temperature sensor U1 and is connected in parallel and to ground.
Further, the determiner includes an operational amplifier U3B, an inverting terminal of the operational amplifier U3B is connected to an output terminal of an operational amplifier U2B in the calculator, an output terminal of the operational amplifier U3B is connected to a base of a transistor Q2, a collector of the transistor Q2 is connected to one end of a resistor R10, an emitter of the transistor Q2 is connected to one end of a resistor R7 and one end of a resistor R16, respectively, the other end of the resistor R16 is connected to a 16 pin of an and gate U4A, a 1 pin of the and gate U4A is connected to one end of a resistor R9, the other end of the resistor R9 is connected to the CO signal, the other end of the resistor R7 is connected to a non-inverting terminal of the operational amplifier U3B, one end of the resistor R11, the other end of a resistor R3 in the calculator is connected to ground, an output terminal of the and gate U4A is connected to a base of a transistor Q4, a collector of the transistor Q4 is connected to one end of a temperature reducer and one end of a relay 6867, and the emitter of a relay 36 1, the other end of the relay K1 is connected with one end of a resistor R18, the other end of a resistor R10 and the other end of a resistor R2 in the calculator and is connected with a positive power supply VCC, the other end of the resistor R18 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with one end of a switch S1.
Further, the signal detection circuit detects an ethylene signal in the raw coal bunker by using an ethylene sensor U5, amplifies the ethylene signal, generates an alarm signal through a diode D2, a diode D3 and a resistor R19 to start the emergency alarm, and transmits the alarm signal to the monitoring center.
Further, the signal detection circuit comprises a resistor R12, one end of a resistor R12 is connected with an out pin of an ethylene sensor U5, a vcc pin of an ethylene sensor U5 is connected with the other end of a switch S1 in the temperature detection circuit, the other end of a resistor R12 is connected with a non-inverting end of an operational amplifier U6B, an inverting end of an operational amplifier U6B is connected with an inverting end of a resistor R13 and one end of a resistor R13, an output end of the operational amplifier U6B is respectively connected with one end of a resistor R15, a base of a triode Q3 and the other end of a resistor R13, an emitter of the triode Q3 is respectively connected with one end of a resistor R17 and one end of a resistor R14, the other end of a resistor R14 is respectively connected with a cathode of a diode D2 and a cathode of a regulator D1, an anode of a diode D2 is respectively connected with one end of a resistor R19, an anode of a diode D3, a monitoring center and an emergency alarm, a cathode of a diode D3 is connected with one end of a resistor R9 in the temperature detection circuit, the other end of the resistor R17 is connected with a gnd pin of the ethylene sensor U5, the anode of the voltage regulator tube D1 and the other end of the resistor R3 in the temperature detection circuit respectively and is connected with the ground in parallel.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
the difference signal output by the operational amplifier U2B in the calculator is judged by arranging the operational amplifier U2B, the operational amplifier U3B and the triode Q2 in the judger, namely, the temperature change in the raw coal bunker is further mastered, the cooler is started and the ethylene detection circuit is started in a delayed manner by utilizing the temperature change and the CO signal in the raw coal bunker through the difference signal, namely, the temperature change and the CO signal in the raw coal bunker by utilizing the AND gate U4A and the triode Q4, the accuracy of starting the cooler and the ethylene detection circuit is embodied, the raw coal bunker is effectively cooled, the phenomenon that the temperature of the raw coal bunker is increased when the CO sensor detects CO gas in the prior art is avoided, the phenomenon that the temperature of the raw coal bunker is increased is avoided, the phenomenon that the ethylene detection circuit and the cooler are started at the moment, the phenomenon of resource waste is caused, and the working effectiveness of the cooler is also improved.
Drawings
Fig. 1 is a schematic structural diagram of a raw coal bunker.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and functional aspects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a raw coal bunker detection device of CFB boiler, is applied to in the raw coal bunker of CFB boiler, alarm device includes temperature detection circuit, signal detection circuit, temperature detection circuit utilizes temperature sensor U1 to detect the temperature signal in the raw coal bunker to utilize the CO signal that detects to open the cooler behind calculator ware and the judger, and delay opening signal detection circuit simultaneously, signal detection circuit utilizes ethylene sensor U5 to detect the ethylene signal in the raw coal bunker and produce alarm signal, transmits alarm signal to the surveillance center, and starts emergency alarm simultaneously.
The calculator comprises a resistor R1, one end of a resistor R1 is connected with an out pin of a temperature sensor U1, the other end of the resistor R1 is respectively connected with one end of a resistor R2, the upper end of an adjustable resistor R4 and the grid of a field effect transistor Q1, the drain of the field effect transistor Q1 is respectively connected with the other end of the resistor R2 and the VCC pin of the temperature sensor U1 and is connected with a positive power supply VCC, the source of the field effect transistor Q1 is respectively connected with one end of a resistor R5 and one end of a resistor R3, the other end of the resistor R5 is respectively connected with one end of a resistor R6 and the in-phase end of an operational amplifier U2B, the inverting end of the operational amplifier U2B is connected with one end of the resistor R8, the other end of the resistor R8 is connected with a standard signal, the other end of an electrical fault R3 is respectively connected with the other end of the resistor R6, the adjustable end of the adjustable resistor R4, the lower end of the adjustable resistor R4 and the gnd pin of the temperature sensor U1 and is connected with the ground;
the judging device comprises an operational amplifier U3B, an inverting terminal of the operational amplifier U3B is connected with an output terminal of an operational amplifier U2B in the calculator, an output terminal of the operational amplifier U3B is connected with a base electrode of a triode Q2, a collector electrode of a triode Q2 is connected with one end of a resistor R10, an emitter electrode of the triode Q2 is respectively connected with one end of a resistor R7 and one end of a resistor R16, the other end of the resistor R16 is connected with a 16 pin of an AND gate U4A, a 1 pin of the AND gate U4A is connected with one end of a resistor R9, the other end of the resistor R9 is connected with a CO signal, the other end of a resistor R7 is respectively connected with a non-inverting terminal of the operational amplifier U3B, one end of a resistor R11, the other end of a resistor R3 in the calculator is connected with the ground in parallel, an output terminal of the AND gate U4A is connected with a base electrode of a triode Q4, a collector electrode of a triode Q4 is respectively connected with one end of a temperature reducing device and one end of a relay K1, the other end of the relay K1 is respectively connected with one end of a resistor R18, the other end of a resistor R10 and the other end of a resistor R2 in the calculator and is connected with a positive power supply VCC, the other end of the resistor R18 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with one end of a switch S1;
the temperature detection circuit comprises a temperature sensor U1, a calculator and a judger, wherein the calculator receives a temperature signal in a raw coal bunker detected by the temperature sensor U1, the temperature sensor detects the temperature by an infrared temperature sensor with the model similar to OS136A, a resistor R1 and an adjustable resistor R4 divide the temperature signal, the divided temperature signal is transmitted to a field effect tube Q1 for buffering, the temperature signal is transmitted to an operational amplifier U2B by a resistor R5 to be subtracted with a standard signal, the operational amplifier U2B outputs a difference signal, the standard signal is the temperature signal at the previous moment in the raw coal bunker detected by the temperature sensor, the difference signal of the standard signal and the temperature signal is the temperature change in the raw coal bunker, the operational amplifier U3B is used for a zero comparator to detect the amplitude of the difference signal, when the amplitude of the difference signal cannot conduct the triode Q2, indicating that the temperature in the raw coal bunker is not increased, namely the concentration of the CO gas in the raw coal bunker is still below a normal threshold value, the temperature reducer is not required to be started to cool the raw coal bunker, when the amplitude of the difference signal turns on the triode Q2, indicating that the temperature in the raw coal bunker is increased, namely the concentration of the CO gas in the raw coal bunker is gradually increased, the triode Q2 outputs a high level to the 16 pin of the and gate U4A through the resistor R16, the 1 pin of the and gate U4A receives the CO signal transmitted through the resistor R9 (the CO signal is amplified), the and gate U4A outputs a high level to turn on the triode Q4, the triode Q4 further turns on the temperature reducer and the relay K1, the temperature reducer starts to cool the raw coal bunker, the resistor R18 and the capacitor C1 perform time delay processing on the switch S1, the switch S1 is closed in a time delay manner, so as to realize the function of a time delay opening signal detection circuit, and simultaneously transmits the CO signal to the signal detection circuit.
The signal detection circuit comprises a resistor R12, one end of a resistor R12 is connected with an out pin of an ethylene sensor U5, a vcc pin of the ethylene sensor U5 is connected with the other end of a switch S1 in the temperature detection circuit, the other end of the resistor R12 is connected with the in-phase end of an operational amplifier U6B, the inverting end of the operational amplifier U6B is connected with the inverting end of the resistor R13 and one end of a resistor R13, the output end of the operational amplifier U6B is respectively connected with one end of a resistor R15, the base of a triode Q3 and the other end of a resistor R13, the emitter of the triode Q3 is respectively connected with one end of a resistor R17 and one end of a resistor R14, the other end of the resistor R14 is respectively connected with the cathode of a diode D2 and the cathode of a voltage regulator D1, the anode of a diode D2 is respectively connected with one end of a resistor R19, the anode of a diode D3, the monitoring center and an emergency alarm, the cathode of a diode D3 is connected with the resistor R9 in the temperature detection circuit, the other end of the resistor R17 is respectively connected with a gnd pin of the ethylene sensor U5, the anode of the voltage regulator tube D1 and the other end of the resistor R3 in the temperature detection circuit and is connected with the ground in parallel;
the signal detection circuit comprises a resistor R12, one end of a resistor R12 is connected with an out pin of an ethylene sensor U5, a vcc pin of the ethylene sensor U5 is connected with the other end of a switch S1 in the temperature detection circuit, the other end of the resistor R12 is connected with the in-phase end of an operational amplifier U6B, the inverting end of the operational amplifier U6B is connected with the inverting end of the resistor R13 and one end of a resistor R13, the output end of the operational amplifier U6B is respectively connected with one end of a resistor R15, the base of a triode Q3 and the other end of a resistor R13, the emitter of the triode Q3 is respectively connected with one end of a resistor R17 and one end of a resistor R14, the other end of the resistor R14 is respectively connected with the cathode of a diode D2 and the cathode of a voltage regulator D1, the anode of a diode D2 is respectively connected with one end of a resistor R19, the anode of a diode D3, the monitoring center and an emergency alarm, the cathode of a diode D3 is connected with the resistor R9 in the temperature detection circuit, the other end of the resistor R17 is respectively connected with a gnd pin of the ethylene sensor U5, the anode of the voltage regulator tube D1 and the other end of the resistor R3 in the temperature detection circuit and is connected with the ground in parallel;
the signal detection circuit utilizes a resistor R18 and a capacitor C1 to carry out delayed opening through a temperature detection circuit, utilizes an ethylene sensor U5 to detect an ethylene signal in a raw coal bunker, the ethylene sensor U5 utilizes a sensor with the model similar to ME3-C2H4 to carry out ethylene signal detection, the delayed opening can also detect the cooling effect of a cooler, when the ethylene signal is not detected, the cooler has a certain effect, the ethylene signal is detected, namely, the ethylene gas is generated, when the ethylene sensor U5 detects the ethylene signal, in order to avoid that the amplitude of the ethylene signal is too weak due to the low concentration of the ethylene gas in the raw coal bunker, the ethylene signal is transmitted to an operational amplifier U6B by utilizing the resistor R12 to be amplified, the amplified ethylene signal is followed by a triode Q3 to improve the driving capability of the ethylene signal, and the ethylene signal is transmitted to a diode D2 by utilizing the resistor R14, the ethylene signal is subjected to voltage stabilization treatment by the resistor R14 and the voltage stabilizing tube D1, the condition that the ethylene signal is amplified by the operational amplifier U6B is avoided, the diode D3 receives the CO signal transmitted by the temperature detection circuit, the CO signal and the ethylene signal are subjected to and treatment by the resistor R19, the diode D2 and the diode D3 to obtain an alarm signal, the emergency alarm is started by the alarm signal to remind field workers of rescuing the raw coal bunker, and meanwhile, the alarm signal is transmitted to the monitoring center to remind the monitoring personnel in the monitoring center of carrying out rescue work on the raw coal bunker together with the field workers.
When the invention is used specifically, the temperature detection circuit comprises a temperature sensor U1, a calculator and a judger, the calculator receives a temperature signal in a raw coal bunker detected by the temperature sensor U1, the temperature signal is transmitted to a field effect transistor Q1 for buffering, the temperature signal is transmitted to an operational amplifier U2B by a resistor R5 to be subtracted from a standard signal, the operational amplifier U2B outputs a difference signal, the operational amplifier U3B is used as a zero comparator to detect the amplitude of the difference signal, when the amplitude of the difference signal can not conduct a triode Q2, the temperature in the raw coal bunker is not increased, when the amplitude of the difference signal conducts the triode Q2, the temperature in the raw coal bunker is increased, the triode Q2 outputs a high level to a pin 16 of an AND gate U4A through the resistor R16, and a pin 1 of the AND gate U4A receives a CO signal, the AND gate U4A outputs high level to conduct the triode Q4, the triode Q4 further conducts the cooler and the relay K1, the resistor R18 and the capacitor C1 conduct delay processing on the switch S1, the switch S1 is closed in a delay mode, the signal detection circuit is opened in a delay mode, meanwhile, the CO signal is transmitted to the signal detection circuit, the signal detection circuit conducts delay opening through the temperature detection circuit by using the resistor R18 and the capacitor C1, then the ethylene signal in the raw coal bunker is detected by using the ethylene sensor U5, when the ethylene signal is detected by the ethylene sensor U5, the ethylene signal is transmitted to the operational amplifier U6B by using the resistor R12 to be amplified, the amplified ethylene signal is followed by the triode Q3, the resistor R19, the diode D2 and the diode D3 conduct AND processing on the CO signal and the ethylene signal to obtain an alarm signal, the alarm signal starts the emergency alarm, and workers on the site need to remind the rescue of the raw coal bunker, meanwhile, an alarm signal is transmitted to the monitoring center to remind monitoring personnel in the monitoring center of carrying out rescue work on the raw coal bunker with on-site working personnel.
(1) The difference signal output by the operational amplifier U2B in the calculator is judged by arranging the operational amplifier U2B, the operational amplifier U3B and the triode Q2 in the judger, namely the temperature change in the raw coal bunker is further mastered;
(2) the temperature reducer is started and the ethylene detection circuit is started in a delayed manner by utilizing the AND gate U4A and the triode Q4 through the difference signal, namely the temperature change and the CO signal in the raw coal bunker, so that the accuracy of starting the temperature reducer and the ethylene detection circuit is embodied, the raw coal bunker is effectively cooled, the phenomenon that the temperature of the raw coal bunker is increased due to the fact that the CO gas is detected by a CO sensor in the prior art is avoided, the ethylene detection circuit and the temperature reducer are started at the moment, the phenomenon of resource waste is caused, and the working effectiveness of the temperature reducer is also improved.

Claims (6)

1. The utility model provides a raw coal bunker fire alarm device of CFB boiler, a serial communication port, alarm device includes temperature detection circuit, signal detection circuit, temperature detection circuit utilizes temperature sensor U1 to detect the temperature signal in the raw coal bunker to utilize the CO signal that detects to open the cooler behind calculator and the judger, and delay time opens signal detection circuit simultaneously, and signal detection circuit utilizes ethylene sensor U5 to detect the ethylene signal in the raw coal bunker and produce alarm signal, transmits alarm signal to the surveillance center, and starts emergency alarm simultaneously.
2. The fire alarm device for the raw coal bunker of the CFB boiler of claim 1, wherein the temperature detecting circuit comprises a temperature sensor U1, a calculator and a decider, the calculator subtracts the temperature signal detected by the temperature sensor U1 to obtain a difference signal, the difference signal turns on the cooler through an AND gate U4A of the decider, and the signal detecting circuit is turned on in a delayed manner.
3. The fire alarm device for the raw coal bunker of the CFB boiler as claimed in claim 1, wherein the calculator comprises a resistor R1, one end of the resistor R1 is connected with an out pin of the temperature sensor U1, the other end of the resistor R1 is respectively connected with one end of the resistor R2, the upper end of the adjustable resistor R4 and the grid of the FET Q1, the drain of the FET Q1 is respectively connected with the other end of the resistor R2 and the VCC pin of the temperature sensor U1 and is connected with a positive power VCC, the source of the FET Q1 is respectively connected with one end of the resistor R5 and one end of the resistor R3, the other end of the resistor R5 is respectively connected with one end of the resistor R6 and the non-inverting end of the operational amplifier U2B, the inverting end of the operational amplifier U2B is connected with one end of the resistor R8, the other end of the resistor R8 is connected with a standard signal, the other end of the electrical fault R3 is respectively connected with the other end of the resistor R6, the non-inverting end of the adjustable resistor R4 and the lower end of the adjustable resistor R4, The gnd pin of the temperature sensor U1 is connected in parallel to ground.
4. The fire alarm device for the raw coal bunker of the CFB boiler as claimed in claim 1, wherein the decision device comprises an operational amplifier U3B, the inverting terminal of the operational amplifier U3B is connected to the output terminal of an operational amplifier U2B in the calculator, the output terminal of the operational amplifier U3B is connected to the base of a transistor Q2, the collector of the transistor Q2 is connected to one terminal of a resistor R10, the emitter of the transistor Q2 is connected to one terminal of a resistor R7 and one terminal of a resistor R16, the other terminal of the resistor R16 is connected to a 16 terminal of an AND gate U4A, the 1 terminal of the AND gate U4A is connected to one terminal of a resistor R9, the other terminal of the resistor R9 is connected to a CO signal, the other terminal of the resistor R7 is connected to the non-inverting terminal of the operational amplifier U3B, one terminal of the resistor R11, the other terminal of the resistor R3 in the calculator, the output terminal of the AND gate U4A is connected to the base of a transistor Q4, and the collector of the transistor Q4 is connected to the temperature-lowering device, One end of a relay K1, an emitter of a triode Q4 is connected with the other end of a resistor R11, the other end of the relay K1 is respectively connected with one end of a resistor R18, the other end of a resistor R10 and the other end of a resistor R2 in the calculator and is connected with a positive power supply VCC, the other end of the resistor R18 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with one end of a switch S1.
5. The fire alarm device for the raw coal bunker of the CFB boiler of claim 1, wherein the signal detection circuit detects an ethylene signal in the raw coal bunker by using an ethylene sensor U5, amplifies the ethylene signal, generates an alarm signal through a diode D2, a diode D3 and a resistor R19, activates the emergency alarm, and transmits the alarm signal to the monitoring center.
6. The fire alarm device for the raw coal bunker of the CFB boiler as claimed in claim 1, wherein the signal detection circuit comprises a resistor R12, one end of the resistor R12 is connected with an out pin of an ethylene sensor U5, a vcc pin of the ethylene sensor U5 is connected with the other end of a switch S1 in the temperature detection circuit, the other end of the resistor R12 is connected with a non-inverting terminal of an operational amplifier U6B, an inverting terminal of the operational amplifier U6B is connected with an inverting terminal of the resistor R13 and one end of a resistor R13, an output terminal of the operational amplifier U6B is connected with one end of a resistor R15, a base of a transistor Q3 and the other end of a resistor R13, an emitter of the transistor Q3 is connected with one end of the resistor R17 and one end of the resistor R14, the other end of the resistor R14 is connected with a cathode of a diode D2 and a cathode of a voltage regulator D1, an anode of a diode D2 is connected with one end of a resistor R19 and an anode of a diode D3, The monitoring center and the emergency alarm are connected, the cathode of the diode D3 is connected with one end of a resistor R9 in the temperature detection circuit, the other end of the resistor R17 is connected with a gnd pin of the ethylene sensor U5, the anode of the voltage regulator tube D1 and the other end of the resistor R3 in the temperature detection circuit in parallel and are grounded.
CN202110978891.8A 2021-08-25 2021-08-25 CFB boiler raw coal bunker fire alarm device Withdrawn CN113685809A (en)

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Application Number Priority Date Filing Date Title
CN202110978891.8A CN113685809A (en) 2021-08-25 2021-08-25 CFB boiler raw coal bunker fire alarm device

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Application Number Priority Date Filing Date Title
CN202110978891.8A CN113685809A (en) 2021-08-25 2021-08-25 CFB boiler raw coal bunker fire alarm device

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CN113685809A true CN113685809A (en) 2021-11-23

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CN202110978891.8A Withdrawn CN113685809A (en) 2021-08-25 2021-08-25 CFB boiler raw coal bunker fire alarm device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114062920A (en) * 2021-11-30 2022-02-18 河南职业技术学院 Internet of things detection circuit for power switch cabinet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114062920A (en) * 2021-11-30 2022-02-18 河南职业技术学院 Internet of things detection circuit for power switch cabinet
CN114062920B (en) * 2021-11-30 2023-07-14 河南职业技术学院 Internet of things detection circuit for power switch cabinet

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Application publication date: 20211123