CN218630568U - Zeolite runner molecular sieve monitored control system - Google Patents
Zeolite runner molecular sieve monitored control system Download PDFInfo
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- CN218630568U CN218630568U CN202223152645.6U CN202223152645U CN218630568U CN 218630568 U CN218630568 U CN 218630568U CN 202223152645 U CN202223152645 U CN 202223152645U CN 218630568 U CN218630568 U CN 218630568U
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Abstract
The utility model relates to an equipment monitoring technology field, the utility model provides a zeolite runner molecular sieve monitored control system, including photoionization sensor, the main control unit, ultraviolet drive circuit and VOC monitoring circuit, photoionization sensor includes ultraviolet lamp P1 and ionization chamber, VOC monitoring circuit includes resistance R4, resistance R5, U4 is put to fortune, resistance R9, resistance R10 and resistance R11, the 5V power is connected to the first end that ionization chamber was connected to resistance R3's second end, U4's inverting input end is put to ionization chamber's second end connection fortune, U4's noninverting input end is put to fortune passes through resistance R4 ground connection, U4's first end is put through resistance R10 connecting resistance R9 to fortune's output, U4's inverting input end is put to resistance R9's second end connection fortune, resistance R11's first end connecting resistance R9's first end, resistance R11's second end ground connection, U4's output connection main control unit is put to fortune. Through above-mentioned technical scheme, the problem that zeolite runner molecular sieve monitoring accuracy is low among the prior art has been solved.
Description
Technical Field
The utility model relates to an equipment control technical field, it is specific, relate to zeolite runner molecular sieve monitored control system.
Background
In the industrial process, a large amount of Volatile Organic Compounds (VOC) are generated, and when the VOC is discharged into the air, the Volatile Organic Compounds (VOC) pollute the atmospheric environment and are harmful to people. With the wide application of the zeolite rotary wheel molecular sieve in various waste gas treatment fields, the zeolite rotary wheel molecular sieve belongs to a core component of environmental protection equipment, and the value of the zeolite rotary wheel molecular sieve occupies a large proportion in the value of the whole set of environmental protection equipment. During the use, the Volatile Organic Compounds (VOC) are discharged into the air without being sufficiently treated due to improper use, and although the concentration of the discharged Volatile Organic Compounds (VOC) is low, the volatile organic compounds still have influence on the air for a long time.
Therefore, VOC concentration monitoring is usually carried out at the inlet and the outlet of the zeolite rotating wheel molecular sieve, and the service efficiency condition of the zeolite rotating wheel molecular sieve is judged, so that the purification efficiency of the zeolite rotating wheel molecular sieve is judged. Common VOC concentration monitoring methods include infrared gas sensors, catalytic combustion gas sensors, electrochemical sensors, and the like. The manufacturing cost of the infrared gas sensor monitoring method is high, and dust and strongly adsorbed substances in the air can influence the monitoring result; the monitoring method of the catalytic combustion type sensor is used as a combustible gas monitor and is greatly influenced by the ambient temperature; the electrochemical sensor monitoring method is more like a fuel cell, the sensing principle is simple, but the monitoring range is small, the size is large, and the manufacturing cost is high. Therefore, a new monitoring method is needed to improve the monitoring accuracy of zeolite rotating wheel molecular sieves.
SUMMERY OF THE UTILITY MODEL
The utility model provides a zeolite runner molecular sieve monitored control system has solved the problem that zeolite runner molecular sieve monitoring accuracy is low among the prior art.
The technical scheme of the utility model as follows:
the zeolite rotating wheel molecular sieve monitoring system comprises a photoionization sensor, a main control unit, an ultraviolet driving circuit and a VOC monitoring circuit, wherein the photoionization sensor comprises an ultraviolet lamp P1 and an ionization chamber, the ultraviolet driving circuit is used for driving the ultraviolet lamp P1, the ionization chamber is connected with the VOC monitoring circuit, the VOC monitoring circuit is connected with the main control unit,
the VOC monitoring circuit includes that U3 is put to resistance R3, resistance R4, resistance R5, fortune, U4, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14 and fortune are put U3, the 5V power is connected to resistance R3's first end, resistance R3's second end is connected the first end of ionization chamber, the second end of ionization chamber passes through resistance R5 connects U4's inverting input end is put to fortune, U4's non inverting input end is put to fortune passes through resistance R4 ground connection, U4's output is put to fortune passes through resistance R10 connects resistance R9's first end, resistance R9's second end is connected U4's inverting input end is put to fortune, resistance R11's first end is connected resistance R9's second end ground connection, U4's output is put to fortune passes through resistance R12 connects U3's inverting input end is put to fortune, U3's non inverting input end is put to fortune passes through resistance R13 ground connection U3, U3 passes through fortune connects U3's inverting input end is put to fortune connection U3's output.
Further, in the utility model discloses in ultraviolet drive circuit includes oscillator U1, driver U2, resistance R7, field effect transistor Q1, field effect transistor Q2, resistance R6, magnetic bead FB, electric capacity C5, inductance L1 and transformer T1, oscillator U1's high trigger signal input is connected oscillator U1's low trigger signal input, oscillator U1's low trigger signal input passes through electric capacity C2 ground connection, oscillator U1's control voltage input passes through electric capacity C1 ground connection, oscillator U1's output is connected driver U2's input, the first output of driver is connected field effect transistor Q1's grid, driver U2's second output is connected field effect transistor Q2's grid, field effect transistor Q1's source electrode passes through resistance R7 VDD connects, field effect transistor Q1's drain electrode is connected field effect transistor Q2's drain electrode, field effect transistor Q2's source electrode passes through resistance R6 ground connection, field effect transistor Q1's drain electrode passes through the second end of magnetic bead FB connects the second end the second of electric capacity C5 the second end T1's output, the transformer T1's output is connected the second end the transformer T1 output, the transformer T1 output is connected the ultraviolet lamp T1 output end the transformer T1.
Furthermore, the utility model also comprises a first temperature monitoring circuit, a second temperature monitoring circuit and a third temperature monitoring circuit, the circuit structures of the first temperature monitoring circuit, the second temperature monitoring circuit and the third temperature monitoring circuit are the same,
the first temperature monitoring circuit comprises a temperature sensor U5, a resistor R17, an operational amplifier U6, a resistor R18, a resistor R19, an operational amplifier U7, a resistor R20 and a rheostat RP1, wherein a first end of the temperature sensor U5 is connected with a 15V power supply, a second end of the temperature sensor U5 is grounded through the resistor R17, a non-inverting input end of the operational amplifier U6 is connected with a second end of the temperature sensor U5, an output end of the operational amplifier U6 is connected with an inverting input end of the operational amplifier U6, an output end of the operational amplifier U6 is connected with a non-inverting input end of the operational amplifier U7 through the resistor R18, a non-inverting input end of the operational amplifier U7 is grounded through the resistor R19, an output end of the operational amplifier U7 is connected with an inverting input end of the operational amplifier U7, an inverting input end of the operational amplifier U7 is connected with a sliding end of the rheostat RP1, a first end of the rheostat RP1 is connected with a 15V power supply, a second end of the rheostat RP1 is grounded, an output end of the operational amplifier U7 is connected with a main control unit, and the operational amplifier U7 serves as an output end of the first temperature monitoring circuit.
Furthermore, the utility model also comprises a linkage control circuit which comprises a resistor R8, a resistor R27, an operational amplifier U10, a resistor R29, a resistor R28, an operational amplifier U11, a resistor R30, a resistor R31, an operational amplifier U12, an OR gate U8 and a relay K1,
the inverting input end of the operational amplifier U10 is connected with Vref reference voltage through the resistor R8, the non-inverting input end of the operational amplifier U10 is connected with the output end of the first temperature monitoring circuit through the resistor R27, the output end of the operational amplifier U10 is connected with the first input end of the OR gate U8, the inverting input end of the operational amplifier U11 is connected with Vref reference voltage through the resistor R29, the non-inverting input end of the operational amplifier U11 is connected with the output end of the second temperature monitoring circuit through the resistor R28, the output end of the operational amplifier U11 is connected with the second input end of the OR gate U8, the inverting input end of the operational amplifier U12 is connected with Vref reference voltage through the resistor R31, the non-inverting input end of the operational amplifier U12 is connected with the output end of the third temperature monitoring circuit through the resistor R30, and the output end of the operational amplifier U12 is connected with the third input end of the OR gate U8,
the output of OR gate U8 is connected relay K1's first input, relay K1's second input ground connection, external power source is connected to relay K1's first public end, external power source is connected to relay K1's second public end, the nitrogen gas storage tank valve is connected to relay K1's the first end of opening always, the water valve that disappears is connected to relay K1's the second end of opening always.
Further, the utility model discloses in still include alarm circuit, alarm circuit includes that resistance R25, resistance R24, emitting diode LED1, resistance R22, resistance R23, fortune are put U9, resistance R26, triode Q3 and alarm BL1, fortune is put U9's in-phase input end and is passed through resistance R25 connects the master control unit, resistance R24's first end is connected U9's in-phase input end is put to fortune, resistance R24's second end is connected emitting diode LED 1's positive pole, emitting diode LED 1's negative pole ground connection, U9's inverting input end is put to fortune is passed through resistance R22 ground connection, U9's inverting input end is put to fortune is passed through resistance R23 connection U9's inverting input end is put to fortune, U9's output is put to fortune is passed through resistance R26 connects triode Q6's base, triode Q6's collecting electrode is connected alarm BL 1's first end, alarm BL 1's second end is connected the 15V power, triode Q3's projecting pole ground connection.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses in, import and export at zeolite runner molecular sieve and set up photoionization sensor respectively, through photoionization sensor monitoring VOC concentration, it is indoor that VOC's gas can get into photoionization sensor's ionization, then ultraviolet drive circuit drive ultraviolet lamp P1 sends the ultraviolet light, when having in the ionization chamber and being surveyed the gas composition, the ultraviolet light of high energy can be to being surveyed gas ionization charge, charge density is directly proportional to being surveyed gas composition, then charge amount in with the ionization chamber truns into and is sent to the main control unit with being surveyed gas composition direct voltage signal by VOC monitoring circuit. And determining the service efficiency condition of the zeolite rotary wheel molecular sieve by comparing the VOC concentration values of the inlet and the outlet of the zeolite rotary wheel molecular sieve. Compared with an infrared gas sensor monitoring method and a catalytic combustion type gas sensor monitoring method, the photoionization sensor monitoring method is not influenced by external environmental factors, and has the advantages of high monitoring precision and simplicity in monitoring.
Specifically, the working principle of the VOC monitoring circuit is: 5V bias voltage is connected to the first end of the ionization chamber, so that current is generated and output from the second end of the ionization chamber. However, the current is weak, the output electric signal is weak, amplification processing needs to be performed on the output electric signal, the operational amplifier U4 forms a first-stage amplification circuit, the resistor R5 is used for converting the current signal into a voltage signal, in order to reduce the influence of thermal noise of the resistance-capacitance element and an error between a nominal value and an actual value on weak current monitoring, the first-stage amplification circuit is a main amplification circuit, the current signal output by the ionization chamber is converted into a voltage and then amplified to a mV-level voltage signal, and the resistor R9, the resistor R10 and the resistor R11 form a T-shaped resistor network to replace a feedback resistor, so that the high gain requirement is met, the resistance value of the feedback resistor can be reduced, and the noise influence caused by the resistance-capacitance element is effectively reduced. The operational amplifier U3 forms a second-stage amplifying circuit, and voltage signals amplified by the second-stage amplifying circuit are sent to the main control unit.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a circuit diagram of a VOC monitoring circuit according to the present invention;
FIG. 2 is a schematic block diagram of a VOC gas concentration monitoring method according to the present invention;
fig. 3 is a circuit diagram of the uv driving circuit of the present invention;
fig. 4 is a circuit diagram of a first temperature monitoring circuit according to the present invention;
fig. 5 is a circuit diagram of the linkage control circuit of the present invention;
fig. 6 is a circuit diagram of the middle alarm circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work, are related to the scope of the present invention.
Example 1
As shown in fig. 1-2, this embodiment provides a zeolite rotary wheel molecular sieve monitoring system, which includes a photoionization sensor, a main control unit, an ultraviolet driving circuit and a VOC monitoring circuit, wherein the photoionization sensor includes an ultraviolet lamp P1 and an ionization chamber, the ultraviolet driving circuit is used for driving the ultraviolet lamp P1, the ionization chamber is connected to the VOC monitoring circuit, the VOC monitoring circuit is connected to the main control unit, the VOC monitoring circuit includes a resistor R3, a resistor R4, a resistor R5, an operational amplifier U4, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and an operational amplifier U3, a first end of the resistor R3 is connected to a 5V power supply, a second end of the resistor R3 is connected to a first end of the ionization chamber, the second end of ionization chamber is connected fortune through resistance R5 and is put U4's inverting input end, U4's inverting input end is put through resistance R4 ground connection to fortune, U4's output is put to fortune is through resistance R10 connecting resistance R9's first end, U4's inverting input end is put to fortune second end connection to fortune of resistance R9, resistance R11's first end connecting resistance R9's first end, resistance R11's second end ground connection, U3's inverting input end is put through resistance R12 connection fortune to fortune output that U4 was put to fortune, U3's inverting input end is put through resistance R13 ground connection to fortune, U3's inverting input end is put through resistance R14 connection fortune to fortune output, U3's output connection main control unit is put to fortune.
The photoionization sensor is used for monitoring the concentration of VOCs and consists of an ultraviolet lamp P1 and an ionization chamber. The photoionization sensor monitors VOC concentration, gas containing VOC can enter an ionization chamber of the photoionization sensor, then the ultraviolet driving circuit drives the ultraviolet lamp P1 to emit ultraviolet light, when the detected gas component exists in the ionization chamber, the high-energy ultraviolet light can ionize the detected gas into electric charge, the electric charge density is in direct proportion to the detected gas concentration, and then the VOC monitoring circuit converts the electric charge amount in the ionization chamber into a voltage signal in direct proportion to the detected gas concentration and sends the voltage signal to the main control unit. In this embodiment, two ultraviolet driving circuits and two VOC monitoring circuits are respectively included, the circuit structures of the two ultraviolet driving circuits and the VOC monitoring circuits are the same, photoionization sensors are respectively arranged at the inlet and the outlet of the zeolite rotary wheel molecular sieve, and the operating efficiency condition of the zeolite rotary wheel molecular sieve is determined by comparing the VOC concentration values at the inlet and the outlet of the zeolite rotary wheel molecular sieve.
Compared with an infrared gas sensor monitoring method and a catalytic combustion type gas sensor monitoring method, the photoionization sensor monitoring method is not influenced by external environmental factors, and has the advantages of high monitoring precision and simplicity in monitoring.
Specifically, the working principle of the VOC monitoring circuit is: the movement directions of charges generated by the VOC gas in the ionization chamber are relatively disordered, so that a bias voltage of 5V is connected to the first end of the ionization chamber, the charges in the ionization chamber move towards one direction, and the generated current is output from the second end of the ionization chamber. However, the current is weak, the output electrical signal is weak, and needs to be amplified, the operational amplifier U4 forms a first-stage amplifier circuit, the resistor R5 is used for converting a current signal into a voltage signal, in order to reduce the influence of thermal noise and a nominal value error of the resistance-capacitance element on weak current monitoring, the first-stage amplifier circuit is a main amplifier circuit, the current signal output by the ionization chamber is converted into a voltage signal of mV level and then amplified, the resistor R9, the resistor R10 and the resistor R11 form a T-type resistor network to replace a feedback resistor, and the T-type resistor network is adopted, so that the high-gain requirement can be met, the resistance value of the feedback resistor can be reduced, and the noise influence caused by the resistance-capacitance element can be effectively reduced.
The operational amplifier U3 forms a second-stage amplifying circuit, because the electric signal output by the ionization chamber is weak, if the first-stage amplifying circuit is adopted, the nominal values of the input resistor and the feedback resistor of the operational amplifier are large, the thermal noise of the resistance-capacitance element is also an important factor influencing weak current monitoring, the larger the nominal value is, the larger the error between the nominal value and the actual value is, the higher the uncertainty of the thermal noise is, the larger the error of the result is, the testing precision of the sensor is directly influenced, and the voltage signal amplified by the second-stage amplifying circuit is sent to the main control unit.
The resistor R15, the capacitor C9, the resistor R16 and the capacitor C10 form a second-order low-pass filter circuit for filtering high-frequency noise waves in the output voltage signal of the operational amplifier U3, and therefore the monitoring precision of the circuit is further improved.
As shown in fig. 3, in this embodiment, the ultraviolet driving circuit includes an oscillator U1, a driver U2, a resistor R7, a field-effect tube Q1, a field-effect tube Q2, a resistor R6, a magnetic bead FB, a capacitor C5, an inductor L1, and a transformer T1, a high trigger signal input end THR of the oscillator U1 is connected to a low trigger signal input end TRIG of the oscillator U1, a low trigger signal input end TRIG of the oscillator U1 is grounded through the capacitor C2, a control voltage input end CVOLT of the oscillator U1 is grounded through the capacitor C1, an output end OUT of the oscillator U1 is connected to an input end of the driver U2, a first output end of the driver is connected to a gate of the field-effect tube Q1, a second output end of the driver U2 is connected to a gate of the field-effect tube Q2, a source of the field-effect tube Q1 is connected to a VDD power supply through the resistor R7, a drain of the field-effect tube Q1 is connected to a drain of the field-effect tube Q2, a source of the field-effect tube Q2 is grounded through the resistor R6, a drain of the field-effect tube Q1 is connected to a first end of the magnetic bead FB of the first end of the capacitor C5, a second end of the capacitor C5 is connected to a second end of the transformer T1, a second end of the transformer L1 is connected to a second end of the transformer T1, and a second end of the transformer T1, and a second input end of the transformer T1 is connected to an ultraviolet lamp input end of the transformer T1, and a second end of the transformer T1 is connected to an output end of the input end of the transformer T1.
In this embodiment, the ultraviolet lamp P1 is an ultraviolet lamp excited by an ac electric field, and is driven by ac power having a peak value of 600V, a frequency of 100kHz, and a duty ratio of 50%.
The ultraviolet driving circuit adopts an oscillator U1 (NE 555) as a main chip to generate high-frequency alternating current which is 100kHz square wave, and the driving capability of the oscillator U1 is weak, so that the ultraviolet lamp P1 cannot normally emit light due to the high-frequency alternating current. In order to enable the high-frequency alternating current to have enough power to drive the ultraviolet lamp P1, a driver U2 is added at the rear stage of the oscillator U1, when the high-frequency signal is in a positive half cycle, two output ends of the driver U2 both output high-level signals, the field-effect tube Q1 is cut off, the field-effect tube Q2 is conducted, at the moment, the drain electrode of the field-effect tube Q2 is a low-level signal, namely, no current passes through a primary coil of the transformer T1, and therefore the ultraviolet lamp P1 does not emit light; when the high-frequency signal is negative half cycle, two output ends of the driver U2 both output low level signals, the field effect tube Q1 is switched on, the field effect tube Q2 is switched off, the drain electrode of the field effect tube Q2 is a high level signal at the moment, namely, the primary coil of the transformer T1 has current passing, the secondary coil of the transformer T1 induces the current to generate 600V high voltage to drive the ultraviolet lamp P1, and the transformer T1 is a boosting high-frequency transformer. When the high-frequency signal becomes positive half cycle again, the ultraviolet lamp P1 does not emit light, and a cycle is formed in sequence.
When the high-frequency signal is negative half cycle, at this moment, if the current output from the drain electrode of the field effect tube Q1 is directly added on a primary coil of a transformer, signal reflection can directly cause the high-frequency alternating current driving the ultraviolet lamp P1 to generate burrs, the burrs can generate irregular induced electromotive force in the circuit after being amplified by the high-frequency transformer, and further generate strong high-frequency electromagnetic interference, which is very unfavorable for monitoring weak signals, therefore, a magnetic bead FB is added between the drain electrode of the field effect tube Q1 and the first input end of the transformer T1 for reducing the ringing of the high-frequency alternating current, meanwhile, a capacitor C5 and an inductor L1 are connected in series after the magnetic bead FB for one time, the capacitor C5 and the inductor L1 form an LC resonance circuit, impedance matching is realized, and the electromagnetic interference generated by the transformer is reduced to the minimum.
As shown in fig. 4, the temperature monitoring circuit further includes a first temperature monitoring circuit, a second temperature monitoring circuit, and a third temperature monitoring circuit, the first temperature monitoring circuit, the second temperature monitoring circuit, and the third temperature monitoring circuit have the same circuit structure, the first temperature monitoring circuit includes a temperature sensor U5, a resistor R17, an operational amplifier U6, a resistor R18, a resistor R19, an operational amplifier U7, a resistor R20, and a rheostat RP1, a first end of the temperature sensor U5 is connected to a 15V power supply, a second end of the temperature sensor U5 is grounded through the resistor R17, a non-inverting input end of the operational amplifier U6 is connected to a second end of the temperature sensor U5, an output end of the operational amplifier U6 is connected to an inverting input end of the operational amplifier U6, an output end of the operational amplifier U6 is connected to a non-inverting input end of the operational amplifier U7 through the resistor R18, a non-inverting input end of the operational amplifier U7 is grounded through the resistor R19, an output end of the operational amplifier U7 is connected to an inverting input end of the operational amplifier U7 through the resistor R20, an inverting input end of the operational amplifier U7 is connected to a sliding end of the rheostat RP1, a first end of the operational amplifier U7 is connected to a main control unit, and an output end of the rheostat is connected to a first temperature monitoring unit.
In this embodiment, a temperature monitoring circuit is respectively disposed at the zeolite rotating wheel molecular sieve adsorption area outlet, the zeolite rotating wheel molecular sieve desorption inlet, and the zeolite rotating wheel molecular sieve desorption outlet, and whether the operation of the zeolite rotating wheel molecular sieve is normal or not is determined according to the temperature changes at the zeolite rotating wheel molecular sieve adsorption area outlet, the zeolite rotating wheel molecular sieve desorption inlet, and the zeolite rotating wheel molecular sieve desorption outlet.
Taking the first temperature monitoring circuit as an example, the working principle of the first temperature monitoring circuit is as follows: the temperature sensor U5 is arranged at an outlet of the zeolite rotating wheel molecular sieve adsorption area, the temperature sensor U5 is used for monitoring the temperature of the outlet of the zeolite rotating wheel molecular sieve adsorption area and converting the temperature change into an electric signal to be output, the temperature change is in direct proportion to the electric signal output by the temperature sensor U5, the electric signal output by the temperature sensor U5 is added to the same-phase input end of the operational amplifier U6, the operational amplifier U6 forms a voltage follower, and the voltage follower plays a role in impedance matching and also plays a role in signal isolation. The output of the temperature sensor U5 is weak, the temperature sensor U5 needs to be amplified, the operational amplifier U7 forms a differential amplifying circuit, the differential amplifying circuit can amplify useful signals to suppress useless signals, the amplified signals are sent to the main control unit through a low-pass filter circuit formed by a resistor R21 and a capacitor C11, and because a small amount of high-frequency clutter signals exist in voltage signals output by the operational amplifier U7, the monitoring precision of the circuit is not affected, the voltage signals need to be filtered, and the high-frequency clutter in the voltage signals are filtered.
As shown in fig. 5, the present embodiment further includes a linkage control circuit, the linkage control circuit includes a resistor R8, a resistor R27, an operational amplifier U10, a resistor R29, a resistor R28, an operational amplifier U11, a resistor R30, a resistor R31, an operational amplifier U12, an or gate U8 and a relay K1, an inverting input terminal of the operational amplifier U10 is connected to a Vref reference voltage through the resistor R8, a non-inverting input terminal of the operational amplifier U10 is connected to an output terminal of the first temperature monitoring circuit through the resistor R27, an output terminal of the operational amplifier U10 is connected to a first input terminal of the or gate U8, an inverting input terminal of the operational amplifier U11 is connected to the Vref reference voltage through the resistor R29, a non-inverting input terminal of the operational amplifier U11 is connected to an output terminal of the second temperature monitoring circuit through the resistor R28, the output end of the operational amplifier U11 is connected with the second input end of the OR gate U8, the inverting input end of the operational amplifier U12 is connected with the Vref reference voltage through a resistor R31, the non-inverting input end of the operational amplifier U12 is connected with the output end of the third temperature monitoring circuit through a resistor R30, the output end of the operational amplifier U12 is connected with the third input end of the OR gate U8, the output end of the OR gate U8 is connected with the first input end of the relay K1, the second input end of the relay K1 is grounded, the first public end of the relay K1 is connected with the external power supply, the second public end of the relay K1 is connected with the external power supply, the first normally open end of the relay K1 is connected with the nitrogen storage tank valve, and the second normally open end of the relay K1 is connected with the water elimination and prevention valve.
When the temperature of the zeolite rotating wheel molecular sieve adsorption area or the zeolite rotating wheel molecular sieve desorption area is too high, the zeolite rotating wheel molecular sieve is possibly broken down, so that the heat of the zeolite rotating wheel molecular sieve cannot be discharged in time, and the temperature of the zeolite rotating wheel molecular sieve adsorption area or the zeolite rotating wheel molecular sieve desorption area is too high.
In this embodiment, a nitrogen storage tank and a fire-fighting water tank are provided, and when the inlet temperature of the zeolite rotary wheel molecular sieve adsorption area exceeds 10 ℃, or the zeolite rotary wheel molecular sieve desorption inlet is greater than 250 ℃, or the zeolite rotary wheel molecular sieve desorption outlet is greater than 150 ℃, a linkage system is started, that is, the zeolite rotary wheel molecular sieve desorption area starts nitrogen purging, and air is isolated to block flames, and the zeolite rotary wheel molecular sieve adsorption area adopts fire-fighting spray to extinguish flames.
Specifically, taking the first temperature monitoring circuit as an example, the working principle of the linkage control circuit is as follows: when the temperature monitored by the first temperature monitoring circuit exceeds a set value, the voltage of the in-phase input end of the operational amplifier U10 is higher than the reference voltage Vref of the anti-phase input end, therefore, the operational amplifier U10 outputs a high level signal, the input end of the OR gate U8 outputs a high level if one way of the input end is a high level, when the OR gate U8 outputs a high level, the coil of the relay K1 is electrified, the normally open end of the relay K1 is closed, namely the nitrogen storage tank valve and the fire water valve are opened, the zeolite runner molecular sieve desorption area starts nitrogen purging, the flame is blocked by isolating air, the zeolite runner molecular sieve adsorption area adopts fire spray, the flame is extinguished, and therefore the molecular sieve smoldering event is avoided.
As shown in fig. 6, in this embodiment, the electronic ballast further includes an alarm circuit, the alarm circuit includes a resistor R25, a resistor R24, a light emitting diode LED1, a resistor R22, a resistor R23, an operational amplifier U9, a resistor R26, a triode Q3, and an alarm BL1, a non-inverting input terminal of the operational amplifier U9 is connected to the main control unit through the resistor R25, a first end of the resistor R24 is connected to the non-inverting input terminal of the operational amplifier U9, a second end of the resistor R24 is connected to an anode of the light emitting diode LED1, a cathode of the light emitting diode LED1 is grounded, an inverting input terminal of the operational amplifier U9 is grounded through the resistor R22, an output terminal of the operational amplifier U9 is connected to the inverting input terminal of the operational amplifier U9 through the resistor R23, an output terminal of the operational amplifier U9 is connected to a base of the triode Q6 through the resistor R26, a collector of the triode Q6 is connected to a first end of the alarm BL1, a second end of the alarm BL1 is connected to a 15V power supply, and an emitter of the triode Q3 is grounded.
In order to further improve the safety of the zeolite rotating wheel molecular sieve, an alarm circuit is further added in the embodiment, when the temperatures of the zeolite rotating wheel molecular sieve adsorption area outlet, the zeolite rotating wheel molecular sieve desorption inlet and the zeolite rotating wheel molecular sieve desorption outlet exceed a set value or the purification efficiency of the zeolite rotating wheel molecular sieve is lower than the set value, a main control unit outputs a PWM control signal to a non-inverting input end of an operational amplifier U9, at the moment, a light emitting diode LED1 starts to flash to send an alarm signal, the operational amplifier U9 forms an amplifying circuit, the PWM control signal is amplified and then added to a base electrode of a triode Q3, and meanwhile, the alarm BL1 sends a 'dripping' alarm signal to inform related workers and solve corresponding problems.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The zeolite rotating wheel molecular sieve monitoring system is characterized by comprising a photoionization sensor, a main control unit, an ultraviolet driving circuit and a VOC monitoring circuit, wherein the photoionization sensor comprises an ultraviolet lamp P1 and an ionization chamber, the ultraviolet driving circuit is used for driving the ultraviolet lamp P1, the ionization chamber is connected with the VOC monitoring circuit, the VOC monitoring circuit is connected with the main control unit,
VOC monitoring circuit includes that resistance R3, resistance R4, resistance R5, fortune are put U4, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14 and fortune are put U3, the 5V power is connected to resistance R3's first end, resistance R3's second end is connected the first end of ionization chamber, the second end of ionization chamber passes through resistance R5 connects U4's inverting input end is put to fortune, U4's noninverting input end is put to fortune passes through resistance R4 ground connection, U4's output is put to fortune passes through resistance R10 connects resistance R9's first end, resistance R9's second end is connected U4's inverting input end is put to fortune, resistance R11's first end is connected resistance R9's first end, resistance R11's second end ground connection, U4's output is put to fortune passes through resistance R12 connects U3's inverting input end is put to fortune, U3's noninverting input end is put to fortune, U3's inverting input end is put to fortune, resistance R3 passes through fortune connects U3's inverting input end the connection unit output.
2. The zeolite rotating wheel molecular sieve monitoring system according to claim 1, wherein the ultraviolet driving circuit includes an oscillator U1, a driver U2, a resistor R7, a field effect transistor Q1, a field effect transistor Q2, a resistor R6, a magnetic bead FB, a capacitor C5, an inductor L1 and a transformer T1, a high trigger signal input terminal of the oscillator U1 is connected to a low trigger signal input terminal of the oscillator U1, a low trigger signal input terminal of the oscillator U1 is grounded through a capacitor C2, a control voltage input terminal of the oscillator U1 is grounded through a capacitor C1, an output terminal of the oscillator U1 is connected to an input terminal of the driver U2, a first output terminal of the driver is connected to a gate of the field effect transistor Q1, a second output terminal of the driver U2 is connected to a gate of the field effect transistor Q2, a source terminal of the oscillator Q1 is connected to a VDD power supply through the resistor R7, a drain terminal of the field effect transistor Q1 is connected to a drain terminal of the field effect transistor Q2, a drain terminal of the field effect transistor Q2 is grounded through the resistor R6, a drain terminal of the magnetic bead FB 1 is connected to an output terminal of the transformer T1, and a second terminal of the transformer T1 is connected to an ultraviolet lamp, and a second end of the transformer T1 is connected to an output terminal of the transformer P1.
3. The zeolite rotating wheel molecular sieve monitoring system of claim 1, further comprising a first temperature monitoring circuit, a second temperature monitoring circuit and a third temperature monitoring circuit, wherein the first temperature monitoring circuit, the second temperature monitoring circuit and the third temperature monitoring circuit have the same circuit structure,
the first temperature monitoring circuit comprises a temperature sensor U5, a resistor R17, an operational amplifier U6, a resistor R18, a resistor R19, an operational amplifier U7, a resistor R20 and a rheostat RP1, wherein a first end of the temperature sensor U5 is connected with a 15V power supply, a second end of the temperature sensor U5 is grounded through the resistor R17, a non-inverting input end of the operational amplifier U6 is connected with a second end of the temperature sensor U5, an output end of the operational amplifier U6 is connected with an inverting input end of the operational amplifier U6, an output end of the operational amplifier U6 is connected with a non-inverting input end of the operational amplifier U7 through the resistor R18, a non-inverting input end of the operational amplifier U7 is grounded through the resistor R19, an output end of the operational amplifier U7 is connected with an inverting input end of the operational amplifier U7, an inverting input end of the operational amplifier U7 is connected with a sliding end of the rheostat RP1, a first end of the rheostat RP1 is connected with a 15V power supply, a second end of the rheostat RP1 is grounded, an output end of the operational amplifier U7 is connected with a main control unit, and the operational amplifier U7 serves as an output end of the first temperature monitoring circuit.
4. The zeolite wheel molecular sieve monitoring system of claim 3, further comprising a linkage control circuit, wherein the linkage control circuit comprises a resistor R8, a resistor R27, an operational amplifier U10, a resistor R29, a resistor R28, an operational amplifier U11, a resistor R30, a resistor R31, an operational amplifier U12, an OR gate U8 and a relay K1,
the inverting input end of the operational amplifier U10 is connected with a Vref reference voltage through the resistor R8, the non-inverting input end of the operational amplifier U10 is connected with the output end of the first temperature monitoring circuit through the resistor R27, the output end of the operational amplifier U10 is connected with the first input end of the OR gate U8, the inverting input end of the operational amplifier U11 is connected with the Vref reference voltage through the resistor R29, the non-inverting input end of the operational amplifier U11 is connected with the output end of the second temperature monitoring circuit through the resistor R28, the output end of the operational amplifier U11 is connected with the second input end of the OR gate U8, the inverting input end of the operational amplifier U12 is connected with the Vref reference voltage through the resistor R31, the non-inverting input end of the operational amplifier U12 is connected with the output end of the third temperature monitoring circuit through the resistor R30, and the output end of the operational amplifier U12 is connected with the third input end of the OR gate U8,
the output of OR gate U8 is connected relay K1's first input, relay K1's second input ground connection, external power source is connected to relay K1's first public end, external power source is connected to relay K1's second public end, the nitrogen gas storage tank valve is connected to relay K1's the first end of opening always, the water valve that disappears is connected to relay K1's the second end of opening always.
5. The zeolite rotating wheel molecular sieve monitoring system according to claim 2, further comprising an alarm circuit, wherein the alarm circuit comprises a resistor R25, a resistor R24, a light emitting diode LED1, a resistor R22, a resistor R23, an operational amplifier U9, a resistor R26, a triode Q3 and an alarm BL1, a non-inverting input terminal of the operational amplifier U9 is connected to the main control unit through the resistor R25, a first end of the resistor R24 is connected to a non-inverting input terminal of the operational amplifier U9, a second end of the resistor R24 is connected to an anode of the light emitting diode LED1, a cathode of the light emitting diode LED1 is grounded, an inverting input terminal of the operational amplifier U9 is grounded through the resistor R22, an output terminal of the operational amplifier U9 is connected to an inverting input terminal of the operational amplifier U9 through the resistor R23, an output terminal of the operational amplifier U9 is connected to a base of the triode Q6 through the resistor R26, a collector of the triode Q6 is connected to a first end of the alarm BL1, a second end of the alarm BL1 is connected to a 15V power supply, and an emitter of the triode Q3 is grounded.
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| CN202223152645.6U CN218630568U (en) | 2022-11-25 | 2022-11-25 | Zeolite runner molecular sieve monitored control system |
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| CN202223152645.6U CN218630568U (en) | 2022-11-25 | 2022-11-25 | Zeolite runner molecular sieve monitored control system |
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