CN114593962A - Oil smoke monitoring self-adaptation front end air intake system - Google Patents

Oil smoke monitoring self-adaptation front end air intake system Download PDF

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Publication number
CN114593962A
CN114593962A CN202210209005.XA CN202210209005A CN114593962A CN 114593962 A CN114593962 A CN 114593962A CN 202210209005 A CN202210209005 A CN 202210209005A CN 114593962 A CN114593962 A CN 114593962A
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temperature
air
humidity
oil smoke
value
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吴以凡
顾春凯
史建凯
吴靖
戴国骏
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Hangzhou Dianzi University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0205—Investigating particle size or size distribution by optical means
    • G01N15/0211—Investigating a scatter or diffraction pattern
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/075—Investigating concentration of particle suspensions by optical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

The invention discloses an oil smoke monitoring self-adaptive front-end air inlet system which comprises an air chamber, a first temperature and humidity sensor, a second temperature and humidity sensor, a driving circuit, a single chip microcomputer, an air pump, an air drying device, an air heating and cooling device, a metal filter screen and an alarm. The air chamber is in a central symmetrical structure; the air pump comprises an air inlet pump arranged between the air inlet and the first temperature and humidity sensor and an air outlet pump arranged between the second temperature and humidity sensor and the air outlet; the metal filter screen is fixed on the inner wall of the air chamber, the gas drying device is arranged in the air chamber, and the gas heating and cooling device, the single chip microcomputer, the alarm and the driving circuit are arranged on the periphery of the air chamber. According to the invention, the oil smoke is dehumidified and heated or cooled in a self-adaptive manner through a PID control algorithm, so that the temperature and the humidity are prevented from generating serious interference on the subsequent test result of the oil smoke detection probe. The alarm can be used for alarming to know that the system has errors, so that the loss of the restaurant caused by abnormal test results is reduced.

Description

Oil smoke monitoring self-adaptation front end air intake system
Technical Field
The invention belongs to the technical field of oil smoke detection, and particularly relates to an oil smoke monitoring self-adaptive front-end air inlet system.
Background
Most of the current probes for measuring soot and particulate matter concentrations employ laser scattering techniques. When the tested gas enters the cavity inside the sensor, particles in the gas can generate a scattering phenomenon by laser, the program analyzes the equivalent particle size and concentration of the particles according to the scattering degree of the laser, the laser also generates the same scattering phenomenon when encountering mist or water vapor in the process, so that the sensor mistakenly collects and calculates the water vapor and the particles, great deviation or even misinformation is generated on the test result, and the possibility of falsifying the restaurant to discharge standard-exceeding oil smoke to cause the restaurant fine or the suspended operation is caused.
Therefore, it is necessary to provide an adaptive front-end air intake system for soot monitoring to solve the above technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an oil smoke monitoring self-adaptive front-end air inlet system.
The technical scheme of the invention is as follows:
according to the invention, the oil smoke is dehumidified and heated or cooled in a self-adaptive manner through the PID control algorithm, so that the temperature and the humidity are prevented from seriously interfering the subsequent test result of the oil smoke detection probe, and the alarm can be used for alarming to know that the system has errors.
The utility model provides an oil smoke monitoring self-adaptation front end air intake system, includes air chamber, first temperature and humidity sensor, second temperature and humidity sensor, drive circuit, singlechip, air pump, gaseous drying device, gaseous heating and cooling device, metal filters and siren.
The air chamber is of a centrosymmetric structure, one end of the air chamber is provided with an air inlet, and the other end opposite to the air chamber is provided with an air outlet; the air pump comprises an air inlet pump arranged between the air inlet and the first temperature and humidity sensor and an air outlet pump arranged between the second temperature and humidity sensor and the air outlet; the metal filter screen is fixed on the inner wall of the air chamber, the gas drying device is arranged in the air chamber, and the gas heating and cooling device, the single chip microcomputer, the alarm and the driving circuit are arranged on the periphery of the air chamber;
the air inlet pump inputs oil smoke to the oil smoke monitoring self-adaptive front end air inlet system through the air inlet;
the air outlet pump outputs oil smoke from the oil smoke monitoring self-adaptive front end air inlet system through the air outlet;
the first temperature and humidity sensor is arranged between the air inlet pump and the air heating and cooling device;
the second temperature and humidity sensor is arranged between the driving circuit and the alarm;
the driving circuit is used for being connected with the first temperature and humidity sensor, the second temperature and humidity sensor, the single chip microcomputer, the air pump, the air drying device, the air heating and cooling device and the alarm, and driving all parts of the system to normally operate.
The single chip microcomputer adjusts the temperature/humidity value according to a preset threshold value through a PID control algorithm.
The PID control algorithm represents three control algorithms, proportional, integral and differential, respectively. The deviation of the controlled object is corrected by the combination of the three algorithms so that it reaches a stable state. First, the proportional control algorithm sets the proportionality coefficient Kp、Kp1Wherein the proportionality coefficient KpFor controlling temperature value, coefficient of proportionality Kp1Used for controlling the humidity value, generating an error value between the first input temperature and humidity value of the oil fume and the set threshold value, and establishing a function K through a proportionality coefficient and the error valuep[t(k)-ttarget]、Kp1[h(k)-htarget]The gas drying device is controlled to heat or dehumidify the oil fume gas. t (k) represents the temperature value at time k, h (k) represents the humidity value at time k, ttargetAnd htargetRepresenting preset temperature and humidity thresholds. Second, a differential coefficient K is setd、Kd1Wherein the differential coefficient KdFor controlling temperature value, coefficient of differentiation Kd1For controlling the humidity value, performing differential calculation on the error value
Figure BDA0003532379570000021
Figure BDA0003532379570000022
And the correction only carries out the first-step calculation, so that the temperature and the humidity of the treated oil fume gas oscillate and fluctuate between the set threshold values. Thirdly, in order to prevent the error value between the actual temperature and humidity of the oil smoke gas and the set threshold value from being eliminated by the first step operation and the second step operation when the temperature and humidity of the oil smoke gas are very close to the set threshold value. Setting an integral quantity Kt、Kt1Wherein the integral coefficient KtFor controlling temperature value, integral coefficient Kt1For controlling the humidity value, the error value, as long as it exists, is continuously integrated (i.e. accumulated) by Kt[t(k)-t(k-1)]、Kt1[h(k)-h(k-1)]And is reflected in the control of the gas drying device.
A use method of an oil smoke monitoring self-adaptive front-end air inlet system comprises the following specific steps:
step 1, inputting oil smoke into an oil smoke monitoring self-adaptive front-end air inlet system through an air inlet pump through an air inlet, measuring the temperature/humidity value of the input oil smoke through a first temperature and humidity sensor, and transmitting an electric signal to a single chip microcomputer.
And 2, processing the electric signal by the single chip microcomputer to obtain a temperature/humidity value, if the temperature/humidity value exceeds a preset threshold value, adjusting the temperature/humidity value by the single chip microcomputer according to the preset threshold value through a PID control algorithm, starting the gas drying device through a driving circuit to reduce the humidity of the oil smoke, and starting the gas heating and cooling device to heat/cool the oil smoke. If the preset threshold value is not exceeded, no operation is performed.
And 3, after the oil smoke is dried by the gas drying device and heated/cooled by the gas heating and cooling device, starting the gas outlet pump to output the oil smoke, measuring the temperature/humidity value of the output oil smoke by the second temperature and humidity sensor, and transmitting the electric signal to the single chip microcomputer.
And 4, processing an electric signal sent by the second temperature and humidity sensor by the single chip microcomputer to obtain a temperature/humidity value, if the processed temperature/humidity value exceeds a preset threshold value, indicating that the system has an error, and starting the alarm by the single chip microcomputer to inform personnel of the error of the system. If the preset threshold value is not exceeded, no operation is performed.
The invention has the beneficial effects that:
(1) according to the invention, the oil smoke is dehumidified and heated or cooled in a self-adaptive manner through a PID control algorithm, so that the temperature and the humidity are prevented from generating serious interference on the subsequent test result of the oil smoke detection probe.
(2) The alarm can be used for alarming to know that the system has errors, so that the loss of the restaurant caused by abnormal test results is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
FIG. 2 is a flow chart of a PID control algorithm according to an embodiment of the invention.
Reference numbers in the figures: 1-an air inlet pump, 2-an oil smoke monitoring self-adaptive front-end air inlet system, 3-a first temperature and humidity sensor, 4-an air heating and cooling device, 5-a single chip microcomputer, 6-a driving circuit, 7-a second temperature and humidity sensor, 8-an alarm, 9-an air outlet pump, 10-an air inlet, 11-a metal filter screen, 12-an air drying device, 13-an air chamber and 14-an air outlet.
Detailed Description
The following is a further description of the invention with reference to the accompanying drawings.
Referring to fig. 1, as a specific example, a schematic structural diagram of an adaptive front-end air intake system for soot monitoring according to an embodiment of the present invention is shown.
The utility model provides an oil smoke monitoring self-adaptation front end air intake system, includes air chamber 13, first temperature and humidity sensor 3, second temperature and humidity sensor 7, drive circuit 6, singlechip 5, the air pump, gaseous drying device 12, gaseous heating and cooling device 4, metal filters 11 and siren 8.
The air chamber 13 is arranged in the middle of the whole self-adaptive front-end air inlet system 2 for monitoring the oil smoke, the air chamber 13 is of a centrosymmetric structure, one end of the air chamber 13 is provided with an air inlet 10, and the other end opposite to the air inlet is provided with an air outlet 14; the air pump comprises an air inlet pump 1 arranged between an air inlet 10 and a first temperature and humidity sensor 3 and an air outlet pump 9 arranged between a second temperature and humidity sensor 7 and an air outlet 14; the metal filter screen 11 is fixed on the inner wall of the air chamber 13, the gas drying device 12 is arranged in the air chamber 13, and the gas heating and cooling device 4, the singlechip 5, the alarm 8 and the drive circuit 6 are arranged on the periphery of the air chamber 13;
the air inlet pump 1 inputs oil smoke into the oil smoke monitoring self-adaptive front end air inlet system through the air inlet 10;
the air outlet pump 9 outputs oil smoke from the oil smoke monitoring self-adaptive front end air inlet system through the air outlet 14;
the first temperature and humidity sensor 3 is arranged between the air inlet pump 1 and the air heating and cooling device 4;
the second temperature and humidity sensor 7 is arranged between the driving circuit and the alarm;
the driving circuit 6 is used for connecting the first temperature and humidity sensor 3, the second temperature and humidity sensor 7, the single chip microcomputer 5, the air pump, the air drying device 12, the air heating and cooling device and the alarm 8, and all parts of the driving system can be driven to normally operate.
The metal filter screen 11 of the system air inlet 10 is used for preventing foreign matters, large particles or oil drops from causing irreversible damage to the system.
The single chip microcomputer 5 adjusts the temperature/humidity value according to a preset threshold value through a PID control algorithm.
The PID control algorithm represents three control algorithms, proportional, integral and differential, respectively. The deviation of the controlled object is corrected by the combination of the three algorithms so that it reaches a stable state. First, the proportional control algorithm sets the proportionality coefficient Kp、Kp1Wherein the proportionality coefficient KpFor controlling temperature value, coefficient of proportionality Kp1Used for controlling the humidity value, generating an error value between the first input temperature and humidity value of the oil fume and the set threshold value, and establishing a function K through a proportionality coefficient and the error valuep[t(k)-ttarget]、Kp1[h(k)-htarget]The gas drying device is controlled to heat or dehumidify the oil fume gas. t (k) represents the temperature value at time k, h (k) represents the humidity value at time k, ttargetAnd htargetRepresenting preset temperature and humidity thresholds. Second, a differential coefficient K is setd、Kd1Wherein the differential coefficient KdFor controlling temperature value, coefficient of differentiation Kd1For controlling the humidity value, performing differential calculation on the error value
Figure BDA0003532379570000051
Figure BDA0003532379570000052
And the correction only carries out the first-step calculation, so that the temperature and the humidity of the treated oil fume gas oscillate and fluctuate between the set threshold values. Thirdly, in order to prevent the error value between the actual temperature and humidity of the oil smoke gas and the set threshold value from being eliminated by the first step operation and the second step operation when the temperature and humidity of the oil smoke gas are very close to the set threshold value. Setting an integral quantity Kt、Kt1Wherein the integral coefficient KtFor controlling temperature value, integral coefficient Kt1For controlling the humidity value, the error value, as long as it exists, is continuously integrated (i.e. accumulated) by Kt[t(k)-t(k-1)]、Kt1[h(k)-h(k-1)]And is reflected in the control of the gas drying device.
A use method of an oil smoke monitoring self-adaptive front-end air inlet system comprises the following specific steps:
step 1, inputting oil smoke into an oil smoke monitoring self-adaptive front-end air inlet system through an air inlet pump through an air inlet, measuring the temperature/humidity value of the input oil smoke through a first temperature and humidity sensor, and transmitting an electric signal to a single chip microcomputer.
And 2, processing the electric signal by the single chip microcomputer to obtain a temperature/humidity value, if the temperature/humidity value exceeds a preset threshold value, adjusting the temperature/humidity value according to the preset threshold value by the single chip microcomputer through a PID control algorithm, starting the gas drying device through a driving circuit to reduce the humidity of the oil smoke, and starting the gas heating and cooling device to heat/cool the oil smoke. If the preset threshold value is not exceeded, no operation is performed.
And 3, after the oil smoke is dried by the gas drying device and heated/cooled by the gas heating and cooling device, starting the gas outlet pump to output the oil smoke, measuring the temperature/humidity value of the output oil smoke by the second temperature and humidity sensor, and transmitting the electric signal to the single chip microcomputer.
And 4, processing an electric signal sent by the second temperature and humidity sensor by the single chip microcomputer to obtain a temperature/humidity value, if the processed temperature/humidity value exceeds a preset threshold value, indicating that the system has an error, and starting the alarm by the single chip microcomputer to inform personnel of the error of the system. If the preset threshold value is not exceeded, no operation is performed.
As shown in fig. 2, the specific steps of the PID control algorithm are as follows:
step 1, collecting a current temperature value t (k) and a current humidity value h (k) through the first temperature and humidity sensor.
Step 2, carrying out proportion adjustment on temperature value Kp[t(k)-ttarget]The system static error is in a controllable range, and at the same time, the system has a faster response speed, and the temperature value is subjected to integral adjustment
Figure BDA0003532379570000061
Generating control to reduce deviation and to perform differential regulation of temperature value Kt[t(k)-t(k-1)]The response speed of the system is accelerated, the adjusting time is shortened, and the dynamic performance of the system is improved.
Step 3, carrying out proportion adjustment on the humidity value Kp1[h(k)-htarget]The static difference of the system is in a controllable range, and at the same time, the system has a faster reaction speed, and the humidity value is adjusted by integration
Figure BDA0003532379570000071
Generating control means for reducing deviation and performing differential adjustment of humidity value Kt1[h(k)-h(k-1)]The response speed of the system is accelerated, the adjusting time is shortened, and the dynamic performance of the system is improved.
And 4, performing parameter fusion calculation on the adjusted temperature value and humidity value.
And 5, outputting the control parameters of the humidity.
And 6, controlling an inlet heater and an outlet heater of the control object.

Claims (3)

1. An oil smoke monitoring self-adaptive front-end air inlet system is characterized by comprising an air chamber, a first temperature and humidity sensor, a second temperature and humidity sensor, a driving circuit, a single chip microcomputer, an air pump, an air drying device, an air heating and cooling device, a metal filter screen and an alarm;
the air chamber is of a centrosymmetric structure, one end of the air chamber is provided with an air inlet, and the other end opposite to the air chamber is provided with an air outlet; the air pump comprises an air inlet pump arranged between the air inlet and the first temperature and humidity sensor and an air outlet pump arranged between the second temperature and humidity sensor and the air outlet; the metal filter screen is fixed on the inner wall of the air chamber, the gas drying device is arranged in the air chamber, and the gas heating and cooling device, the single chip microcomputer, the alarm and the driving circuit are arranged on the periphery of the air chamber;
the air inlet pump inputs oil smoke to the oil smoke monitoring self-adaptive front end air inlet system through the air inlet;
the air outlet pump outputs oil smoke from the oil smoke monitoring self-adaptive front-end air inlet system through the air outlet;
the first temperature and humidity sensor is arranged between the air inlet pump and the air heating and cooling device;
the second temperature and humidity sensor is arranged between the driving circuit and the alarm;
the driving circuit is used for connecting the first temperature and humidity sensor, the second temperature and humidity sensor, the single chip microcomputer, the air pump, the air drying device, the air heating and cooling device and the alarm, and driving all parts of the system to normally operate;
the single chip microcomputer adjusts the temperature/humidity value according to a preset threshold value through a PID control algorithm.
2. The method of claim 1The self-adaptive front-end air inlet system for monitoring the lampblack is characterized in that the PID control algorithm respectively represents three control algorithms, namely proportion, integral and differential; correcting the deviation of the controlled object through the combination of the three algorithms so as to enable the controlled object to reach a stable state; first, the proportional control algorithm sets the proportionality coefficient Kp、Kp1Wherein the proportionality coefficient KpFor controlling temperature value, coefficient of proportionality Kp1Used for controlling the humidity value, generating an error value between the first input temperature and humidity value of the oil fume and the set threshold value, and establishing a function K through a proportionality coefficient and the error valuep[t(k)-ttarget]、Kp1[h(k)-htarget]The gas drying device is controlled to heat or dehumidify the oil fume gas; t (k) represents the temperature value at time k, h (k) represents the humidity value at time k, ttargetAnd htargetRepresenting preset temperature and humidity thresholds; second, a differential coefficient K is setd、Kd1Wherein the differential coefficient KdFor controlling temperature value, coefficient of differentiation Kd1For controlling the humidity value, performing differential calculation on the error value
Figure FDA0003532379560000021
Figure FDA0003532379560000022
Correcting oscillation fluctuation between the temperature and the humidity of the oil fume gas after being processed due to the fact that only the first-step calculation is carried out; thirdly, in order to prevent that the error value between the actual temperature and humidity of the oil fume gas and the set threshold value cannot be eliminated by the first step operation and the second step operation when the temperature and humidity of the oil fume gas are very close to the set threshold value; setting an integral quantity Kt、Kt1Wherein the integral coefficient KtFor controlling temperature value, integral coefficient Kt1For controlling the humidity value, the error value is continuously integrated by K as long as the error value existst[t(k)-t(k-1)]、Kt1[h(k)-h(k-1)]And is reflected in the control of the gas drying device.
3. The oil smoke monitoring self-adaptive front-end air intake system according to claim 1 or 2, wherein a using method of the oil smoke monitoring self-adaptive front-end air intake system comprises the following specific steps:
step 1, inputting oil smoke into an oil smoke monitoring self-adaptive front-end air inlet system through an air inlet pump through an air inlet, measuring the temperature/humidity value of the input oil smoke through a first temperature and humidity sensor, and transmitting an electric signal to a single chip microcomputer;
step 2, the single chip microcomputer processes the electric signal to obtain a temperature/humidity value, if the temperature/humidity value exceeds a preset threshold value, the single chip microcomputer adjusts the temperature/humidity value according to the preset threshold value through a PID control algorithm, the gas drying device is started through a driving circuit to reduce the humidity of the oil smoke, and the gas heating and cooling device is started to heat/cool the oil smoke; if the preset threshold value is not exceeded, no operation is carried out;
step 3, after the oil smoke is dried by the gas drying device and heated/cooled by the gas heating and cooling device, the gas outlet pump is started to output the oil smoke, and meanwhile, the second temperature and humidity sensor measures the temperature/humidity value of the output oil smoke and transmits an electric signal to the single chip microcomputer;
step 4, the single chip microcomputer processes an electric signal sent by a second temperature and humidity sensor to obtain a temperature/humidity value, if the processed temperature/humidity value exceeds a preset threshold value, an error occurs in the system, and the single chip microcomputer starts the alarm to inform personnel of the error in the system; if the preset threshold value is not exceeded, no operation is performed.
CN202210209005.XA 2022-03-04 2022-03-04 Oil smoke monitoring self-adaptation front end air intake system Pending CN114593962A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115372285A (en) * 2022-10-26 2022-11-22 杭州泽天春来科技有限公司 Tail gas analysis device and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115372285A (en) * 2022-10-26 2022-11-22 杭州泽天春来科技有限公司 Tail gas analysis device and method

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