CN111999294A - Boiler water quality online detection device and method - Google Patents
Boiler water quality online detection device and method Download PDFInfo
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- CN111999294A CN111999294A CN202010781271.0A CN202010781271A CN111999294A CN 111999294 A CN111999294 A CN 111999294A CN 202010781271 A CN202010781271 A CN 202010781271A CN 111999294 A CN111999294 A CN 111999294A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8411—Application to online plant, process monitoring
- G01N2021/8416—Application to online plant, process monitoring and process controlling, not otherwise provided for
Abstract
The invention discloses a boiler water quality on-line detection device, which comprises a test container and an image processing unit, wherein the image processing unit is used for processing an image of a water quality to be detected; the test container is connected with the boiler through a pipeline and is connected with the image processing unit; the bottom of the boiler is provided with a first electromagnetic valve; the pipeline is provided with a pressure reducing valve, a plate type heat exchanger and a drainage device; the first electromagnetic valve at the bottom of the boiler is connected with an inlet of a pressure reducing valve through a pipeline, an outlet of the pressure reducing valve is connected with one end of a plate heat exchanger through a pipeline, the other end of the plate heat exchanger is connected with an inflow port of a flow diverter through a pipeline, and an outflow port of the flow diverter is connected with a test container through a pipeline. The boiler water in the boiler is treated by the pressure reducing valve and the plate heat exchanger, so that the boiler water discharged by the boiler water is cooled; and detecting the mixed boiler water through an image processing module, and processing the detected blue boiler water through gray scale recognition so as to judge the water quality change trend of the boiler.
Description
Technical Field
The invention relates to the field of boiler water quality detection, in particular to a boiler water quality online detection device and method.
Background
Water is industrial blood, a boiler is an industrial heart, and boiler water treatment is an essential means for providing qualified blood for the heart and ensuring safe and economic operation of the boiler. However, improper detection of water quality can cause scaling, corrosion and water and steam cosecant to the boiler. The harm is represented by uneven local temperature caused by scaling, which directly influences heat transfer and normal steam-water circulation, causes under-deposit corrosion, fuel waste and shortens the service life of the boiler, and causes pipe expansion, deformation or pipe explosion accidents. Therefore, the boiler water quality detection work has very important practical significance.
At present, the on-line water quality detection of a boiler is generally carried out by a method of measuring electrical conductivity, but the price of a high-temperature sensor matched with the boiler is usually about 1.0 ten thousand, and the boiler is not provided with a high-temperature sensor at home and is difficult to be widely applied. In addition, the method of image identification is also proposed for detection, but no practical application is seen in the market, the logic is complex, only red or blue can be judged, the practical value is not high, and the trend of the water quality change of the boiler cannot be judged.
The patent with the publication number of CN204287051U discloses a full-automatic online water quality monitoring device, which belongs to the field of sewage treatment and comprises a machine body, wherein a main controller, an assay cup and three medicine cups are arranged in the machine body, the three medicine cups are respectively provided with corresponding medicines, the assay cup is communicated with the three medicine cups through pipelines, peristaltic pumps are arranged on the pipelines, the peristaltic pumps are driven by stepping motors, the assay cup is communicated with a water inlet pipe, a water outlet pipe and a liquid discharge pipe, the water inlet pipe, the water outlet pipe and the liquid discharge pipe are respectively provided with a control valve, and the main controller realizes opening or closing of the corresponding control valves according to preset time; the main controller of the invention regularly collects water in the boiler circulating pipeline through the water inlet pipe, detects the hardness of the water through corresponding agents, and discharges the water through the water discharge pipe after detection, thereby realizing the online detection of the boiler feed water, effectively preventing scaling caused by unqualified feed water, having certain application value, but being incapable of detecting the high temperature and high pressure of the boiler water in the boiler (a peristaltic pump cannot work), being not suitable for the online water quality detection of the boiler and incapable of detecting the water quality condition of the boiler water in real time.
Therefore, the present embodiment provides an apparatus and a method for online detection of boiler water quality.
Disclosure of Invention
The invention aims to provide a boiler water quality online detection device and method aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an on-line detection device for boiler water quality comprises a test container and an image processing unit;
the test container is connected with the boiler through a pipeline and is connected with the image processing unit; the bottom of the boiler is provided with a first electromagnetic valve; the pipeline is provided with a pressure reducing valve, a plate type heat exchanger and a flow diverter; the first electromagnetic valve at the bottom of the boiler is connected with an inlet of a pressure reducing valve through a pipeline, an outlet of the pressure reducing valve is connected with one end of a plate heat exchanger through a pipeline, the other end of the plate heat exchanger is connected with an inflow port of a flow diverter through a pipeline, and an outflow port of the flow diverter is connected with a test container through a pipeline.
Furthermore, the test kit container is connected with the inflow port of the flow diverter through a pipeline.
Further, still include the second solenoid valve, the second solenoid valve sets up in the boiler bottom.
Correspondingly, the boiler water quality on-line detection method comprises the following steps:
s1, controlling a first electromagnetic valve at the bottom of a boiler to be opened, and enabling boiler water to flow into a flow diverter through a pressure reducing valve and a plate heat exchanger in sequence;
s2, controlling a preset test dose in the test agent container to flow into the drainage device, mixing the test agent with furnace water to obtain water quality to be detected, and flowing the water quality to be detected into the test container;
and S3, detecting the water quality to be detected in the test container based on the image processing unit to obtain a final detection result.
Further, the opening time of the first electromagnetic valve at the bottom of the boiler is controlled to be 5-10S in the step S1.
Further, the step S3 specifically includes:
s31, receiving a water quality image to be detected in the test agent container acquired by the camera device;
and S32, identifying the received water quality image to be detected to obtain a final detection result.
Further, the step S32 is specifically:
s321, identifying the received water quality image to be detected to obtain an identification result;
s322, judging whether the identification result is blue or wine red, and if the identification result is wine red, executing a step S325; if it is blue, go to step S323;
s323, carrying out gray level identification processing on each image corresponding to the blue water quality image to be detected to obtain the gray levels of all the images, deleting the images with the highest and the lowest gray levels in all the images, and carrying out average calculation on the gray levels of the rest images to obtain the gray level value of the final water quality image;
s324, judging whether the gray level value of the obtained final water quality image is higher than a preset threshold value or not, and if so, ending the processing; if not, go to step S325;
and S325, controlling the second electromagnetic valve to be opened to discharge the sewage in the boiler, and detecting the quality of the boiler water again after the sewage discharge is finished.
Further, after the step S323, the method further includes:
and converting the gray level value of the obtained final water quality image into an analog quantity result.
Further, the step S31 is to obtain the water quality images, specifically, the photographing time interval is 1 to 3 seconds, and 5 to 10 water quality images are obtained.
Further, the preset threshold value is 40-100.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the boiler water in the boiler is treated by the first electromagnetic valve, the pressure reducing valve and the plate heat exchanger, so that the boiler water discharged by the boiler is subjected to cooling treatment and is not directly discharged, and the energy efficiency of the boiler is not reduced;
2. according to the invention, the furnace water subjected to cooling treatment and the test agent are mixed through the flow diverter, so that the furnace water can be detected, and detection devices are reduced;
3. the mixed boiler water is detected by the image processing module, and the detected blue boiler water is processed by gray scale identification, so that the water quality change trend of the boiler is judged;
4. the invention can be suitable for boilers in various pause positions by setting the drainage time and the pollution discharge time.
Drawings
FIG. 1 is a schematic diagram of an on-line water quality detecting device for a boiler according to an embodiment;
FIG. 2 is a flow chart of a boiler water quality on-line detection method provided by the second embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to provide a boiler water quality online detection device and method aiming at the defects of the prior art.
Example one
The embodiment provides an online detection device for boiler water quality, as shown in fig. 1, comprising a test container 1, an image processing unit (not shown in the figure), a test agent container 6; the testing container 1 is connected with the boiler 2 through a pipeline, and the testing container 1 is connected with the image processing unit; the pipeline is provided with a pressure reducing valve 3, a plate type heat exchanger 4 and a flow diverter 5; the bottom of the boiler 2 is connected with an inlet of a pressure reducing valve 3 through a pipeline, an outlet of the pressure reducing valve 3 is connected with one end of a plate heat exchanger 4 through a pipeline, the other end of the plate heat exchanger 4 is connected with an inflow port of a flow diverter 5 through a pipeline, and an outflow port of the flow diverter 5 is connected with the testing container 1 through a pipeline; the test agent container 6 is connected with the inflow port of the flow diverter 5 through a pipeline.
In the embodiment, the bottom of the boiler is provided with a first electromagnetic valve 7 and a second electromagnetic valve 8, and the inlet of the pressure reducing valve 3 is connected with the first electromagnetic valve 7 at the bottom of the boiler 2 through a pipeline; the second electromagnetic valve 8 is a sewage discharge electromagnetic valve for discharging sewage in the boiler.
The control of this embodiment to first solenoid valve 7, second solenoid valve 8, relief pressure valve 3, plate heat exchanger 4, drainage device 5, image processing unit all passes through single chip microcomputer control, and the execution subject of this embodiment is the singlechip promptly.
The first electromagnetic valve 7 is arranged at the bottom of the boiler and used for controlling the opening or closing of the bottom of the boiler, and when the first electromagnetic valve is opened, boiler water in the boiler flows out from the bottom of the boiler; the time of opening the first electromagnetic valve every time is 5-10 s.
The inlet of the pressure reducing valve 3 is connected with the first electromagnetic valve through a pipeline, the pressure reducing valve is used for reducing pressure, the inlet pressure is reduced to a certain required outlet pressure through adjusting the pressure reducing valve, and the outlet pressure is automatically kept stable by means of the energy of the medium.
One end of the plate-type heat exchanger 4 is connected with an outlet of the pressure reducing valve through a pipeline, when furnace water flows into the plate-type heat exchanger through the pipeline after being subjected to pressure reduction treatment by the pressure reducing valve, the plate-type heat exchanger carries out treatment of reducing the temperature of the inflowing furnace water and reducing the drainage energy, and the purpose of reducing the temperature of the furnace water is achieved.
The plate heat exchanger achieves temperature reduction by absorbing heat of a medium to be cooled through a refrigerant to achieve a cooling effect. As shown in figure 1, the heat of the boiler water is absorbed by the boiler water inlet (tap water), so as to achieve the cooling effect.
This embodiment adopts heat exchanger to cool down to the stove water, and the cost is reduced on the one hand, does not need high-priced temperature sensor, and on the other hand cools down the temperature of stove water, has avoided the composition of high temperature destruction test agent, has improved the detection precision.
The inflow port of the flow diverter 5 is respectively connected with the other end of the plate heat exchanger and the container port of the test agent container through pipelines, when furnace water subjected to cooling treatment flows into the flow diverter through the pipelines, the singlechip controls the pipeline connected with the test agent container to be opened, so that the test agent in the test agent container flows into the flow diverter through the pipeline, the test agent and the furnace water are mixed in the flow diverter, and after the furnace water and the test agent are mixed, the color of the generated solution is wine red or blue.
Wherein, the amount of the test agent is the amount which can achieve the detection purpose and corresponds to the furnace water. The test agent may be an alkalinity measuring agent.
Preferably, a third electromagnetic valve and a meter are arranged at the bottle mouth of the test agent container, the third electromagnetic valve controls the outflow of the side impact in the test agent, and the meter is used for metering the amount of the outflow test agent; alternatively, the third solenoid valve and the metering device may not be provided, and the amount of the test reagent in the test reagent container is adapted to the amount of the furnace water in the flow diverter.
The container opening of the test container 1 is connected with the outflow opening of the flow diverter through a pipeline, and when the furnace water and the test agent are mixed in the flow diverter, the furnace water and the test agent flow into the test container through the container opening of the test container.
This embodiment adopts a device of drainage ware to mix test agent and brine to solution after will mixing flows into the test container, has reduced detection device and reduce cost, makes simple structure and convenient operation.
The image processing unit is connected with the testing container and is used for processing the mixed solution in the testing container.
Specifically, the image processing unit comprises a camera module, an identification module, a processing module and a judgment module.
And the camera module is used for acquiring a water quality image to be detected in the test agent container.
The camera module is a camera or a video camera, and can be arranged at the body of the test container or at other positions as long as the mixed solution in the container can be shot.
When the camera device shoots the mixed solution, 5-10 images are continuously shot by shooting one picture at intervals of 1-3 s, and the obtained 5-10 images are transmitted to the identification module.
The identification module is connected with the camera module and used for identifying the acquired water quality image to obtain a color corresponding to the water quality image; the colors include wine red and blue.
The identification module may be a color identifier, an image identifier, or the like.
The identification module receives 5-10 pictures transmitted by the camera device and then identifies the color of the solution in the pictures;
and if the color of the solution in the transmitted image is wine red, the singlechip control system opens a second electromagnetic valve (a pollution discharge electromagnetic valve) for 5-30 minutes (determined according to the station of the boiler) to discharge the sewage in the boiler, and after the pollution discharge is finished, the water quality detection is carried out again.
And if the color of the solution in the transmitted image is identified to be blue, transmitting the image to a processing module for processing.
And the processing module is connected with the identification module and is used for carrying out gray level identification processing on each image corresponding to the water quality image when the obtained color corresponding to the water quality image is blue, obtaining the gray levels of all the images, deleting the images with the highest and the lowest gray levels in all the images, and carrying out average calculation on the gray levels of the rest images to obtain the gray level value of the final water quality image.
When the identification module identifies that the solution in the image is blue, gray level identification is carried out on each of the 5-10 identified images to obtain 5-10 gray level values, the image corresponding to the highest gray level value and the lowest gray level value is removed from the 5-10 gray level values to obtain the remaining 3-8 images, and the average value calculation is carried out on the gray level values of the 3-8 images to obtain the final gray level value of the mixed solution image.
A grayscale image is a monochrome image having 256 grayscale levels or levels from black to white. Each pixel in the image is represented by 8-bit data, and thus the pixel point value is between black and white for one of 256 gray scales. The image has only grey levels and no color changes.
And after the final gray level value of the mixed solution image is obtained, inputting the final gray level value into a judgment module for processing.
The judging module is connected with the processing module and used for judging whether the gray level value of the obtained final water quality image is higher than a preset threshold value or not; wherein the predetermined threshold is 40-100.
Judging whether the obtained gray level value is higher than 40-100, if so, indicating that the water quality of the furnace water meets the requirement, and not processing; if not, the water quality of the boiler water is not qualified, the singlechip control system opens the second electromagnetic valve (a sewage discharge electromagnetic valve) for 5-30 minutes (determined according to the boiler station), so that the sewage in the boiler is discharged, and after the sewage discharge is finished, the water quality detection is carried out again.
This embodiment not only handles the stove water that detects wine red color solution, but also can detect the stove water of blue solution and carry out further processing, has improved the detection progress, and can learn the condition of blue corresponding boiler water quality in advance, the subsequent processing of being convenient for.
In this embodiment, the image processing unit further includes a conversion module, connected to the processing module, for converting the obtained processing result into an analog result.
Converting the calculated image gray scale of the mixed solution into an analog quantity result, wherein the conversion formula is as follows:
Ov＝[(Osh-Osl)*(Iv-Isl)/(Ish-Isl)]+Osl
wherein, Ov represents a conversion result; iv represents a conversion target; osh represents the upper limit (500) of the conversion result; osl denotes the lower limit (0) of the conversion result; ish represents the upper limit of the conversion object (500); isl represents the lower limit (0) of the conversion target.
Conversion of gradation value into analog quantity:
the gray scale 0 represents 4mA or 0v, the gray scale 127 represents 2mA or 5v, and the gray scale 255 represents 20mA or 10 v; the gray scale 255 represents the lightest blue color and the best boiler water quality, and the gray scale 0 represents the darkest blue color and the worst boiler water quality.
In this embodiment, the value converted into the analog quantity is displayed so that the user can know the quality of the boiler water in the boiler and also the trend of the change of the boiler water quality.
When the water in the boiler is lower than the required water level, the water enters the boiler through a boiler water inlet (tap water) and a water replenishing pump 9, and the water level in the boiler is increased to the required water level.
The working principle of the boiler water quality on-line detection device of the embodiment is as follows:
the single chip microcomputer control system opens a first electromagnetic valve at the bottom of the boiler for 5-10 seconds, the amount of the boiler water flowing out is set, and the boiler water is discharged into a testing container through a pressure reducing valve, a plate type heat exchanger and a flow diverter. Wherein, the plate heat exchanger is linked with the boiler water supply, used for reducing the temperature of water and reducing the water discharge energy, and discharged into the container; the flow diverter is used for pumping a certain amount of test agent from the test agent container to the test container and simultaneously mixing boiler water with the test agent.
Sending a photographing request by the boiler single chip microcomputer control system, photographing the test container by a camera/machine, continuously photographing 5-10 pictures at the photographing interval time of 1-3 s, and after receiving the pictures by the boiler single chip microcomputer control system, if the pictures are wine red, not identifying the gray level; if blue is detected, carrying out gray level identification on each image, removing one highest and lowest image, averaging, and carrying out analog quantity quantization, wherein the gray level 0 represents 4mA or 0v, the gray level 127 represents 2mA or 5v, and the gray level 255 represents 20mA or 10 v; the gray scale 255 represents the lightest blue color and the best boiler water quality, and the gray scale 0 represents the darkest blue color and the worst boiler water quality.
If the gray level is lower than 40-100 or the wine red is identified, the single chip microcomputer control system opens the blow-down electromagnetic valve for 3-10 minutes (determined according to the boiler station), and after blow-down is finished, circular detection is performed again.
Compared with the prior art, the embodiment has the following beneficial effects:
1. in the embodiment, the boiler water in the boiler is treated by the first electromagnetic valve, the pressure reducing valve and the plate heat exchanger, so that the boiler water discharged by the boiler is subjected to cooling treatment and is not directly discharged, and the energy efficiency of the boiler cannot be reduced;
2. in the embodiment, the furnace water subjected to cooling treatment and the test agent are mixed through the flow diverter, so that the furnace water can be detected, and detection devices are reduced;
3. in the embodiment, the mixed boiler water is detected by the image processing module, and the blue boiler water is processed by gray scale identification, so that the water quality change trend of the boiler is judged;
4. the embodiment can be suitable for boilers in various pause positions by setting the drainage time and the pollution discharge time.
Example two
The embodiment provides an online detection method for boiler water quality, wherein the detection method is based on the online detection device for boiler water quality of the first embodiment, as shown in fig. 2, and the method comprises the following steps:
s11, controlling a first electromagnetic valve at the bottom of the boiler to be opened, and enabling boiler water to flow into a flow diverter through a pressure reducing valve and a plate heat exchanger in sequence;
s12, controlling a preset test dose in a test agent container to flow into a drainage device, mixing the test agent with furnace water to obtain water quality to be detected, and flowing the water quality to be detected into the test container;
and S13, detecting the water quality to be detected in the test container based on the image processing unit to obtain a final detection result.
The execution main body of the embodiment is a single chip microcomputer.
In step S11, the first electromagnetic valve at the bottom of the boiler is controlled to open, so that boiler water flows into the flow diverter through the pressure reducing valve and the plate heat exchanger in sequence; the furnace water amount flowing out is preset water amount
The single chip microcomputer controls the first electromagnetic valve to be opened for 5-10 s, and boiler water in the boiler sequentially flows into the flow diverter through the pressure reducing valve and the plate heat exchanger through the pipeline; the pressure reducing valve is used for reducing pressure, when furnace water is subjected to pressure reduction treatment by the pressure reducing valve and then flows into the plate heat exchanger through the pipeline, the plate heat exchanger is used for reducing the temperature of the inflowing furnace water and reducing the drainage energy, the purpose of reducing the temperature of the furnace water is achieved, and finally the furnace water flows into the flow diverter.
In this embodiment, the amount of furnace water flowing out is a preset amount, and the amount of the furnace water is determined according to actual conditions.
In step S12, controlling a preset test dose in the test agent container to flow into the flow diverter, mixing the test agent with furnace water to obtain water quality to be detected, and flowing the water quality to be detected into the test container; the inflow test dose is a preset test dose.
The singlechip controls a pipeline connected with the test agent container to be opened, so that the test agent in the test agent container flows into the drainage device through the pipeline, the test agent and furnace water are mixed in the drainage device, and after the furnace water and the test agent are mixed, the color of the generated solution is wine red or blue.
The amount of the test agent is the amount which corresponds to the furnace water and can achieve the detection purpose, and the test agent can be an alkalinity determination agent.
When the mixing of the furnace water and the test agent in the flow diverter is finished, the furnace water flows into the test container through the container opening of the test container.
This embodiment adopts a device of drainage ware to mix test agent and brine to solution after will mixing flows into the test container, has reduced detection device and reduce cost, makes simple structure and convenient operation.
In step S13, the quality of the water to be detected in the test container is detected based on the image processing unit, and a final detection result is obtained.
The method specifically comprises the following steps:
s131, receiving a water quality image to be detected in the test agent container acquired by the camera device;
the camera device is a camera or a video camera, and can be arranged at the bottle body of the test container, or at other positions as long as the mixed solution in the container can be shot.
When the camera device shoots the mixed solution, 5-10 images are continuously shot by shooting one picture at intervals of 1-3S, and the step S132 is executed on the obtained 5-10 images.
And S132, identifying the received water quality image to be detected to obtain a final detection result.
Step S132 specifically includes:
s1321, identifying the received water quality image to be detected to obtain an identification result;
the identification may be performed by means of a color identifier, an image identifier, or the like.
And when 5-10 pictures transmitted by the camera device are received, identifying the color of the solution in the pictures, wherein the identification result is blue or wine red.
S1322, judging whether the identification result is blue or wine red, and executing a step S1325 if the identification result is wine red; if blue, go to step S1323;
s1323, carrying out gray level identification processing on each image corresponding to the blue water quality image to be detected to obtain the gray levels of all the images, deleting the images with the highest and the lowest gray levels in all the images, and carrying out average calculation on the gray levels of the rest images to obtain the gray level value of the final water quality image;
when the solution in the obtained image is judged to be blue, carrying out gray level identification on each image in 5-10 images to obtain 5-10 gray level values, removing the image corresponding to the highest gray level value and the lowest gray level value from the 5-10 gray level values to obtain the rest 3-8 images, and carrying out average value calculation on the gray level values of the 3-8 images to obtain the final gray level value of the mixed solution image.
S1324, judging whether the gray level value of the obtained final water quality image is higher than a preset threshold value or not, and if so, ending the processing; if not, go to step S1325; wherein the predetermined threshold is 40-100.
Judging whether the obtained gray level value is higher than 40-100, if so, indicating that the water quality of the furnace water meets the requirement, and not processing; if not, the quality of the furnace water is judged not to be satisfactory, and step S1325 is executed.
S1325, controlling the second electromagnetic valve to be opened to discharge the sewage in the boiler, and detecting the quality of the boiler water again after the sewage discharge is finished.
And the singlechip control system opens the second electromagnetic valve (a pollution discharge electromagnetic valve) for 5-30 minutes (determined according to the boiler station), so that the sewage in the boiler is discharged, and after the pollution discharge is finished, the water quality detection is carried out again.
This embodiment not only handles the stove water that detects wine red color solution, but also can detect the stove water of blue solution and carry out further processing, has improved the detection progress, and can learn the condition of blue corresponding boiler water quality in advance, the subsequent processing of being convenient for.
In this embodiment, step S1323 is followed by:
and converting the gray level value of the obtained final water quality image into an analog quantity result.
Converting the calculated image gray scale of the mixed solution into an analog quantity result, wherein the conversion formula is as follows:
Ov＝[(Osh-Osl)*(Iv-Isl)/(Ish-Isl)]+Osl
wherein, Ov represents a conversion result; iv represents a conversion target; osh represents the upper limit (500) of the conversion result; osl denotes the lower limit (0) of the conversion result; ish represents the upper limit of the conversion object (500); isl represents the lower limit (0) of the conversion target.
Conversion of gradation value into analog quantity:
the gray scale 0 represents 4mA or 0v, the gray scale 127 represents 2mA or 5v, and the gray scale 255 represents 20mA or 10 v; the gray scale 255 represents the lightest blue color and the best boiler water quality, and the gray scale 0 represents the darkest blue color and the worst boiler water quality.
In this embodiment, the value converted into the analog quantity is displayed so that the user can know the quality of the boiler water in the boiler and also the trend of the change of the boiler water quality.
Compared with the prior art, the embodiment has the following beneficial effects:
1. in the embodiment, the boiler water in the boiler is treated by the first electromagnetic valve, the pressure reducing valve and the plate heat exchanger, so that the boiler water discharged by the boiler is subjected to cooling treatment and is not directly discharged, and the energy efficiency of the boiler cannot be reduced;
2. in the embodiment, the furnace water subjected to cooling treatment and the test agent are mixed through the flow diverter, so that the furnace water can be detected, and detection devices are reduced;
3. in the embodiment, the mixed boiler water is detected by the image processing module, and the blue boiler water is processed by gray scale identification, so that the water quality change trend of the boiler is judged;
4. the embodiment can be suitable for boilers in various pause positions by setting the drainage time and the pollution discharge time.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An on-line detection device for boiler water quality is characterized by comprising a test container and an image processing unit;
the test container is connected with the boiler through a pipeline and is connected with the image processing unit; the bottom of the boiler is provided with a first electromagnetic valve; the pipeline is provided with a pressure reducing valve, a plate type heat exchanger and a flow diverter; the first electromagnetic valve at the bottom of the boiler is connected with an inlet of a pressure reducing valve through a pipeline, an outlet of the pressure reducing valve is connected with one end of a plate heat exchanger through a pipeline, the other end of the plate heat exchanger is connected with an inflow port of a flow diverter through a pipeline, and an outflow port of the flow diverter is connected with a test container through a pipeline.
2. The boiler water quality on-line detection device according to claim 1, further comprising a test agent container, wherein the test agent container is connected with the inflow port of the flow diverter through a pipeline.
3. The on-line water quality detection device for the boiler as claimed in claim 2, further comprising a second electromagnetic valve, wherein the second electromagnetic valve is arranged at the bottom of the boiler.
4. An online detection method for boiler water quality, which is based on any one of claims 1 to 3, and comprises the following steps:
s1, controlling a first electromagnetic valve at the bottom of a boiler to be opened, and enabling boiler water to flow into a flow diverter through a pressure reducing valve and a plate heat exchanger in sequence;
s2, controlling a preset test dose in the test agent container to flow into the drainage device, mixing the test agent with furnace water to obtain water quality to be detected, and flowing the water quality to be detected into the test container;
and S3, detecting the water quality to be detected in the test container based on the image processing unit to obtain a final detection result.
5. The on-line detection method for the water quality of the boiler as claimed in claim 4, wherein the opening time of the first electromagnetic valve at the bottom of the boiler controlled in the step S1 is 5-10S.
6. The on-line detection method for the water quality of the boiler according to claim 4, wherein the step S3 specifically comprises:
s31, receiving a water quality image to be detected in the test agent container acquired by the camera device;
and S32, identifying the received water quality image to be detected to obtain a final detection result.
7. The on-line detection method for the water quality of the boiler according to claim 6, wherein the step S32 is specifically as follows:
s321, identifying the received water quality image to be detected to obtain an identification result;
s322, judging whether the identification result is blue or wine red, and if the identification result is wine red, executing a step S325; if it is blue, go to step S323;
s323, carrying out gray level identification processing on each image corresponding to the blue water quality image to be detected to obtain the gray levels of all the images, deleting the images with the highest and the lowest gray levels in all the images, and carrying out average calculation on the gray levels of the rest images to obtain the gray level value of the final water quality image;
s324, judging whether the gray level value of the obtained final water quality image is higher than a preset threshold value or not, and if so, ending the processing; if not, go to step S325;
and S325, controlling the second electromagnetic valve to be opened to discharge the sewage in the boiler, and detecting the quality of the boiler water again after the sewage discharge is finished.
8. The on-line detection method for the water quality of the boiler according to claim 7, wherein the step S323 is followed by further comprising:
and converting the gray level value of the obtained final water quality image into an analog quantity result.
9. The on-line detection method for the water quality of the boiler according to claim 6, wherein the step S31 is implemented by taking 5-10 water quality images with a photographing time interval of 1-3S.
10. The on-line detection method for the water quality of the boiler according to claim 7, wherein the preset threshold value is 40-100.
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