CN102226755A - On-line analyzer for monitoring silicate concentration or phosphate concentration in water - Google Patents

Abstract

The invention discloses an on-line analyzer for monitoring silicate concentration or phosphate concentration in water. The analyzer comprises: a fluid path system used for detecting the silicate concentration or the phosphate concentration in water; an image collecting system used for collecting the silicate concentration or the phosphate concentration in a water sample in the fluid path system before and after a reaction, and for transmitting corresponding information to a computer controlling system; and the computer controlling system used for controlling the fluid path system to complete the detecting of the silicate concentration or the phosphate concentration, for controlling the communication between the fluid path system and the image collecting system, and for processing the information transmitted from the image collecting system. Based on computer technologies, calibration parameters and measured data can be inquired and deleted, history curves can be provided, and data from instruments can be observed visually. Based on image processing technologies, measurement precision can be improved, and system errors can be eliminated. With the analyzer provided by the present invention, continuous detection can be achieved in real-time. The analyzer also has advantages of convenient operation, high automation degree, low maintenance workload, and good linearity and reproducibility.

Description

On-line analyzer for monitoring silicate concentration or phosphate concentration in water

technical field

The invention relates to the technical field of analyzing the concentration of silicate or phosphate in aqueous solution, in particular to the field of measuring the concentration of silicate or phosphate by using digital image processing technology.

Background technique

At present, water is the working medium of power plant boilers. Therefore, the requirements for boiler water quality will directly affect whether the boiler can operate safely, reliably, stably and economically. However, when the temperature and steam pressure of the water in the boiler rise and fall, the salts carried in the water will be precipitated, resulting in salt accumulation and scaling in the boiler. Therefore, in order to prevent salt accumulation and scaling of thermal equipment, slow down the corrosion of thermal equipment, prolong the maintenance cycle and life of thermal equipment, and ensure the safe operation of the unit, boiler water and steam must be monitored and treated.

At present, most of the domestic and foreign countries adopt the treatment method of adding phosphate, adding appropriate phosphate in the boiler water to maintain a certain amount of phosphate in the boiler water, which can improve the buffer performance of the boiler water, maintain the pH value of the boiler water, and effectively prevent Scaling and corrosion of boiler water wall tubes. Therefore, the phosphate concentration analyzer for measuring the phosphate content in boiler sample water and steam is of great significance in power plant water quality supervision, equipment anti-corrosion, and heat exchanger leak detection.

For the detection of the concentration of silicate, it is generally known to adopt the silicon molybdenum blue method and the chemiluminescence method. Silicon molybdenum blue method, that is, the sample water reacts with ammonium molybdate to form silicon molybdenum yellow, which is reduced to silicon molybdenum blue with a reducing agent, and finally the concentration of silicate is measured by spectrophotometry. Using spectrophotometry requires irradiation of light source and collection Collector of optical signals. Chemiluminescence method, that is, the sample water reacts with a variety of reagents to emit light of a certain wavelength, and the light is captured by the collector, and the concentration of silicate can be known according to the captured light. However, the long-term work of the light source and the collector will cause photoelectric fatigue, and the optical signal is easily disturbed, resulting in an unstable linear relationship between the intensity of the collected optical signal and the silicate concentration, and its linear range is also very narrow. make the measurement results inaccurate.

It can be seen that the above-mentioned prior detection of silicate concentration or phosphate concentration in water obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently. In order to solve the problem of detecting the concentration of silicate or phosphate in water, relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure for general products to solve the problem. The above-mentioned problem is obviously a problem that relevant industry players are eager to solve.

In view of the defects in the above-mentioned existing detection of silicate concentration or phosphate concentration in water, the inventors actively research and innovate based on years of rich practical experience and professional knowledge in the design and manufacture of this type of product, and cooperate with the application of theories, in order to Creating an online analyzer with a new structure for monitoring the concentration of silicate or phosphate in water can improve the general existing methods of detecting the concentration of silicate or phosphate in water and make it more practical. Through continuous research, design, and after repeated trial samples and improvements, the present invention with practical value is finally created.

Contents of the invention

The main purpose of the present invention is to overcome the existing defects in the detection of silicate concentration or phosphate concentration in water, and provide an online analyzer for monitoring silicate concentration or phosphate concentration in water with a new structure. The technical problem is to make it based on digital image processing technology, measure the concentration of silicate or phosphate according to the color difference of the image taken before and after the reaction of the sample water, improve the measurement accuracy, stability and repeatability, and thus be more suitable for It is practical and has industrial utilization value.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. A kind of on-line analyzer for monitoring silicate concentration or phosphate concentration in water proposed according to the present invention comprises:

Liquid system, used to detect the concentration of silicate or phosphate in the sample water;

The image acquisition system is used to collect the silicate concentration or phosphate concentration of the sample water in the liquid system before and after the reaction, and transmit the corresponding information to the computer control system;

The computer control system is used to control the liquid path system to complete the detection of silicate concentration or phosphate concentration, communicate with the image acquisition system, and process the information transmitted by the image acquisition system.

The aforementioned online analyzer for monitoring the concentration of silicate or phosphate in water, wherein the liquid circuit system includes an overflow pool and a reaction pool, and corresponding liquid level switches, pumps, and electromagnetics for controlling the overflow pool and the reaction pool valve, the reaction pool communicates with a plurality of reagent bottles containing reaction reagents.

The aforesaid on-line analyzer for monitoring silicate concentration or phosphate concentration in water, preferably four reagent bottles of the online analyzer for monitoring silicate concentration in water, respectively equipped with molybdenum Ammonium Acid, Oxalic Acid, Ferrous Sulfate and Sulfuric Acid.

The aforementioned on-line analyzer for monitoring silicate concentration or phosphate concentration in water, preferably two reagent bottles for the on-line analyzer for monitoring phosphate concentration in water, one of which contains rice A mixed solution of tur and potassium metabisulfite, and another mixed solution of ammonium molybdate, citric acid and sulfuric acid.

The aforementioned online analyzer for monitoring silicate concentration or phosphate concentration in water, wherein the image acquisition system includes a darkroom and a quartz vessel arranged in the darkroom, and the bottom of the quartz vessel is arranged between the darkroom and the darkroom. There are multiple halogen lamps, a camera and a solution inlet are arranged on the top of the darkroom, and a sewage outlet is arranged on the bottom of the darkroom, and the solution inlet is connected to a liquid outlet of the reaction pool through a solenoid valve, and the sewage discharge There is a sewage pump at the mouth.

The aforementioned online analyzer for monitoring silicate concentration or phosphate concentration in water, wherein the computer control system includes an industrial control computer, and the industrial control computer is provided with an insertion port of a digital input and output board and an image acquisition card, The industrial control computer is connected with the liquid level switch, the pump and the electromagnetic valve in the control liquid circuit system through the digital quantity input and output board.

By means of the above-mentioned technical scheme, the online analyzer for monitoring silicate concentration or phosphate concentration in water of the present invention has at least the following advantages:

Based on computer technology, calibration parameters and measurement data can be queried and deleted, and historical curves can be provided at the same time, so that instrument data can be observed more intuitively; based on digital image processing technology, measurement accuracy is improved and system errors are better eliminated. The analyzer can perform real-time continuous testing, is convenient to operate, has a high degree of automation, minimal maintenance, and good linearity and reproducibility.

In summary, the special structure of the present invention is used to monitor the concentration of silicate or phosphate in water. Based on digital image processing technology, the silicate concentration is measured according to the color difference of the image taken before and after the reaction of the sample water. Or the concentration of phosphate, which improves the measurement accuracy, stability and repeatability. It has the above-mentioned many advantages and practical value, and there is no similar structural design publicly published or used in similar products, so it is indeed innovative. It has great improvements in both structure and function. It has made great progress, and has produced easy-to-use and practical effects, and has improved multiple functions compared with the existing detection of silicate concentration or phosphate concentration in water, so it is more suitable for practical use, and has wide application value in the industry. Honesty is a novel, progressive and practical new design.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly and implement them according to the contents of the description, the preferred embodiments of the present invention and accompanying drawings are described in detail below.

The specific embodiment of the present invention is given in detail by the following examples and accompanying drawings.

Description of drawings

Fig. 1 is the flow chart of the online analyzer for monitoring silicate concentration or phosphate concentration in water according to the present invention;

Fig. 2 is the structural representation of the on-line analyzer for monitoring silicate concentration in water described in embodiment 1 of the present invention;

Fig. 3 is a schematic structural diagram of an online analyzer for monitoring phosphate concentration in water according to Example 2 of the present invention.

Detailed ways

In order to further elaborate the technical means and effects that the present invention takes to achieve the intended invention purpose, the online analyzer for monitoring silicate concentration or phosphate concentration in water proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. , its specific implementation, structure, features and effects are described in detail below.

As shown in Figure 1, an online analyzer for monitoring silicate concentration or phosphate concentration in water includes:

Liquid system 1, computer control system 2 and image acquisition system 3. Under the control of the computer control system 2, the liquid system 1 automatically completes flushing, sample water metering, and quantitative dosing in a certain time sequence. The liquid system 1 mainly includes overflow pools and reaction pools and corresponding control overflow pools and reaction pools. Liquid level switch 5, pump and solenoid valve 6. The liquid level switch 5, the pump and the electromagnetic valve 6 are arranged inside or on the side of the liquid flow pool and the reaction pool, and are connected with the computer 8 through the board card 7 to realize on-line control; the computer control system 2 includes an industrial control computer 8, which is equipped with The insertion port of the board card 7 and the image acquisition card 91, write monitoring software to carry out overall control to the computer control system 2 through the board card 7, based on the digital image processing technology, the industrial control computer 8 carries out the corresponding signal collected by the image acquisition card 91 process, establish a specific model, and obtain the concentration of silicate or phosphate according to the color difference of the images taken before and after the reaction of the sample water; the image acquisition system 3 is composed of a CCD camera 101, an image acquisition card 91 and a darkroom 111, and the CCD The camera 101 is set inside the darkroom 111. The CCD camera 101 adopts a color area array camera with high-precision and large-capacity cache. The image acquisition card 91 adopts a real-time image acquisition card with a TMSC6211 digital processor as the core, so that more accurate images can be obtained.

Example 1

This embodiment describes in detail the structure of the online analyzer for monitoring the silicate concentration in water. Referring to FIG. 2, a liquid level switch 4 is arranged in the overflow pool 12, and an overflow port 13 and a calibration liquid port 17 are opened on both sides. And the sample water port 33, the calibration liquid port 17 is provided with a calibration pump 15, the calibration liquid 14 is connected with the overflow pool 12 through the calibration pump 15, the sample water port 33 is provided with a solenoid valve 16, and the sample water passes through the solenoid valve 16 and overflow pool 12 connection, the bottom of the overflow pool 12 is connected with the reaction pool 21 through the analysis valve 18, the reaction pool 21 is provided with four reagent inlets, two overflow ports and sewage outlets from top to bottom, and the two liquid flow ports of the reaction pool 21 The liquid flow port I19 of the reaction tank 21 and the overflow port II22 connected to the darkroom 11 are respectively, and the overflow port II22 is provided with a solenoid valve 23, and the liquid circuit system is connected with the darkroom 11 through the solenoid valve 23, and the reaction tank 21 is provided with The stirrer 24, the stirrer 24 adopts the electromagnetic stirring rod, has accelerated the reaction speed and makes the chromogenic solution more uniform, and four reagent pumps 26-1, 26-2, 26-3, 26-4 are arranged successively at the reagent inlet, The four kinds of reagent bottles are respectively connected to the reaction pool 21 through the corresponding four kinds of reagent pumps. The four kinds of reagent bottles are respectively ammonium molybdate 25-1, oxalic acid 25-2, ferrous sulfate 25-3 and sulfuric acid 25-4. The liquid level switches 32-1, 32-2, 32-3, 32-4 are correspondingly arranged in the reagent bottles, which can alarm when the reagent capacity is insufficient. A quartz vessel 28 is arranged in the darkroom 11, three halogen lamps 29 are arranged between the bottom of the quartz vessel 28 and the darkroom 11, a CCD camera 10 and a solution inlet 30 are arranged on the top of the darkroom 11, and a sewage outlet 31 is arranged at the bottom, and the solution inlet 30 is connected with the liquid flow port II 22 of the reaction tank 21 through the solenoid valve 23 to realize the communication between the reaction tank 21 and the darkroom 11, and the sewage outlet 31 is provided with a sewage pump 27, and the sewage pump 27 immediately removes the quartz vessel 28 after each photo is taken. The solution in the interior is discharged, and the translucency of its quartz vessel 28 is not good, and the low-power bulb of 3W is adopted in the halogen lamp 29, provides suitable light for taking pictures of the camera, and the photographing process is that special quartz vessel 28 and CCD camera are installed 10 and carried out in the darkroom 11 that is completely protected from light. Before the sample water reacts, take pictures of the sample water, and immediately drain the sample water after taking pictures. The image acquisition card 9 inputs the collected signals into the computer 8, and digital image processing technology is applied. The computer processes the two images collected, and obtains the concentration of silicate radicals according to the color difference.

Example 2

This embodiment describes in detail the specific structure of the on-line analyzer used to monitor the phosphate concentration in water. Referring to Figure 3, a liquid level switch 4.1 is arranged in the overflow tank 12.1, and overflow ports 13.1 and calibration liquid ports are opened on both sides. 17.1 and the sample water port 33.1, the calibration liquid port 17.1 is provided with a calibration pump 15.1, the calibration liquid 14.1 is connected to the overflow pool 12.1 through the calibration pump 15.1, the sample water port 33.1 is provided with a solenoid valve 16.1, and the sample water is connected to the overflow tank through the solenoid valve 16.1 The pool 12.1 is connected, the bottom of the overflow pool 12.1 is connected with the reaction pool 21.1 through the analysis valve 18.1, the reaction pool 21.1 is provided with two reagent inlets, two overflow ports and a sewage outlet from top to bottom, and the two liquid flows of the reaction pool 21.1 The ports are respectively used as the liquid flow port I19.1 of the reaction tank 21.1 and the overflow port II22.1 communicating with the darkroom 11.1. The overflow port II22.1 is provided with a solenoid valve 23.1, and the liquid circuit system 1 is connected to the darkroom 11.1 through the solenoid valve 23.1. connection, the reaction tank 21.1 is provided with a stirrer 24.1, and the stirrer 24.1 adopts an electromagnetic stirring rod, which speeds up the reaction speed and makes the color solution more uniform, and the reagent pumps 26.1-1, 26.1-2 are arranged in turn at the reagent inlet. Reagent bottles 25.1-1 and 25.1-2 of two different reagents are respectively connected to the reaction pool 21.1 through reagent pumps. One of the reagent bottles of two different reagents is equipped with a mixed solution of Metol and potassium metabisulfite, and the other is filled with There is a mixed solution of ammonium molybdate, citric acid and sulfuric acid.

Liquid level switches 32.1-1 and 32.1-2 are respectively arranged in the two reagent bottles, and can alarm when the reagent volume is insufficient. A quartz vessel 28.1 is arranged in the darkroom 11.1, three halogen lamps 29.1 are arranged between the bottom of the quartz vessel 28.1 and the darkroom 11.1, a CCD camera 10.1 and a solution inlet 30.1 are arranged on the top of the darkroom 11.1, a sewage outlet 31.1 is opened at the bottom, and a solution inlet 30.1 is connected with the liquid flow port II 22.1 of the reaction tank 21.1 through the solenoid valve 23.1, so as to realize the communication between the reaction tank 21.1 and the dark room 11.1, and the sewage discharge port 31.1 is provided with a sewage pump 27.1. After each photo is taken, the sewage pump 27.1 immediately discharges the quartz After the solution in the vessel 28.1 has been drained, the light transmission of the quartz vessel 28.1 is not good, and the halogen lamp 29.1 adopts a 3W low-power bulb to provide suitable light for the camera to take pictures. CCD camera 10.1 is carried out in the darkroom 11.1 completely protected from light. Before the sample water reacts, take pictures of the sample water, and immediately drain the sample water after taking pictures. To take pictures, the image acquisition card 9.1 inputs the collected signals into the computer 8.1, applying digital image processing technology, the computer 8.1 processes the two collected images, and obtains the concentration of phosphate radicals according to their color difference.

The above-mentioned structure constitutes the technical innovation of the online analyzer for monitoring the silicate concentration or phosphate concentration in water of the present invention, which has many advantages for the technicians in the same industry, and it is indeed technologically progressive.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solution of the present invention.

Claims (6)

1. in-line analyzer that is used to monitor water mesosilicic acid root concentration or phosphate concentration is characterized in that comprising:

Liquid-way system is used to detect sample water mesosilicic acid root concentration or phosphate concentration;

Image capturing system is used for gathering before the reaction of liquid-way system sample water and reacted silicate concentration or phosphate concentration, and gives computer control system with corresponding information transmission;

Computer control system is used to control that liquid-way system is finished the detection of silicate concentration or phosphate concentration and communicate with described image capturing system and to connect, and image capturing system institute information transmitted is handled.

2. the in-line analyzer that is used to monitor water mesosilicic acid root concentration or phosphate concentration according to claim 1, it is characterized in that, described liquid-way system comprises level switch, pump and the solenoid valve of run-off and reaction tank and corresponding control run-off and reaction tank, and described reaction tank is connected with a plurality of reagent bottles that reaction reagent is housed.

3. the in-line analyzer that is used to monitor water mesosilicic acid root concentration or phosphate concentration according to claim 1, it is characterized in that, the described reagent bottle that is used to monitor the in-line analyzer of water mesosilicic acid root concentration is preferably four, and ammonium molybdate, oxalic acid, ferrous sulphate and sulfuric acid are housed respectively in the described reagent bottle.

4. the in-line analyzer that is used to monitor water mesosilicic acid root concentration or phosphate concentration according to claim 1, it is characterized in that, the described reagent bottle that is used for monitoring the in-line analyzer of water phosphate concentration is preferably two, mixed solution that Mitouer and potassium metabisulfite are housed in the described reagent bottle, another is equipped with the mixed solution of ammonium molybdate, citric acid and sulfuric acid.

5. the in-line analyzer that is used to monitor water mesosilicic acid root concentration or phosphate concentration according to claim 1, it is characterized in that, described image capturing system comprises the darkroom and is arranged on silica ware in the described darkroom, be provided with a plurality of Halogen lamp LEDs between the bottom of described silica ware and the described darkroom, the top in described darkroom is provided with camera and solution inlet, the bottom in described darkroom is provided with sewage draining exit, described solution inlet is connected with a liquid head piece of described reaction tank by solenoid valve, states the sewage draining exit place and is provided with dredge pump.

6. the in-line analyzer that is used to monitor water mesosilicic acid root concentration or phosphate concentration according to claim 1 and 2, it is characterized in that, described computer control system comprises industrial control computer, described industrial control computer is provided with the insertion mouth of digital quantity input and output integrated circuit board and image pick-up card, and described industrial control computer is connected with level switch, pump and the solenoid valve of control in the liquid-way system by digital quantity input and output integrated circuit board.

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