CN212658656U - High-parameter boiler water quality monitoring system - Google Patents
High-parameter boiler water quality monitoring system Download PDFInfo
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Abstract
The utility model relates to a high parameter boiler water quality monitoring system, which comprises an online phosphorus meter, a conductivity flow cell, an electric regeneration cation exchange column, a hydrogen type exchange column, a hydrogen-electricity flow guiding flow cell, a degassing unit, a degassing hydrogen-electricity flow guiding flow cell, a multi-channel conductivity meter and a programmable controller; the boiler water sample is divided into two paths for conveying, wherein one path is conveyed to an on-line phosphorus meter, the other path is conveyed to a conductivity flow cell, and the conductivity flow cell, an electric regeneration cation exchange column, a hydrogen type exchange column, a hydrogen-electricity flow guiding through cell, a degassing unit and a degassed hydrogen-electricity flow guiding through cell are sequentially connected according to the water flow direction; the conductivity flow cell, the hydrogen-electricity flow guiding flow cell and the degassing hydrogen conductivity flow cell are electrically connected with the multi-channel conductivity meter through electrode wires; and the online phosphorus meter, the degassing unit and the multi-channel conductivity meter are in communication connection with the programmable controller. The system can run for a long time and is maintenance-free, and calibration and maintenance are not needed after installation and debugging.
Description
Technical Field
The utility model relates to a power plant water quality monitoring technical field, specifically say, relate to a high parameter boiler water quality monitoring system.
Background
Boiler water quality plays a key role in safe operation of a boiler, boiler water is a water sample with the worst water quality in a whole water vapor system, and trace impurities from feed water are concentrated in a steam drum continuously, so that the content of impurity ions in the boiler water is increased continuously. Concentrated impurity in the boiler water easily leads to the water-cooling wall to take place to corrode and scale deposit, leads to boiler heat transfer to worsen and even take place the explosion, consequently need adjust and monitor boiler water quality of water, prevents the emergence of scale deposit and corrosion.
The steam-liquid two phases exist in the steam drum, and ammonia in the feed water can be distributed for the second time in the steam drum; due to the distributed nature of ammonia, less ammonia is dissolved in the furnace water, most of which is in the vapor phase, and therefore the furnace water pH is lower. In order to control scaling and corrosion, furnace water is typically treated with phosphate, low phosphate, sodium hydroxide, or total volatile treatments. No matter what treatment process is adopted, the conductivity, the pH value or the phosphate radical content of the furnace water and the like need to be monitored in real time, and the water quality is ensured to be in a control range.
At present, according to the requirements of guide rules and regulations, the water quality indexes of boiler water which are usually monitored are conductivity, pH value and phosphate radical content, and part of the boiler water also monitors hydrogen conductivity. The conductivity, the hydrogen conductivity and the phosphate radical content are easy to detect, and the measurement accuracy is high. However, the pH value cannot always ensure the measurement accuracy due to the particularity of a pH instrument, and the hydrogen conductivity cannot reflect the real content of the impurity anions due to the existence of phosphate radicals.
The pH value and the impurity anion content of the furnace water are the most important water quality indexes of the furnace water, but a pH instrument is easily influenced by factors such as flow rate, temperature and calibration, and the accuracy is poor; the monitoring of the content of the impurity anions is influenced by phosphate radicals, so that the hydrogen conductivity loses the reference significance. The main reasons for corrosion and tube explosion of many water-cooled walls are that the pH value of the boiler water is low or high and the content of impurity anions is too high, so that the measurement accuracy of the pH value of the boiler water and the content of the impurity anions is very critical, and the method has great significance for safe operation of the boiler.
For example, patent publication No. CN 102621939B: the technical scheme disclosed by the patent adopts a direct measurement method to realize the monitoring or automatic regulation of the quality of the boiler water, and the technical basis of the device is based on the direct measurement of instruments such as a pH electrode, a conductivity meter, a phosphorus meter and the like, so that the device and the method have the defects of low accuracy and reliability.
Therefore, there is a need for an improved and optimized boiler water quality monitoring device and method.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design is reasonable, the system is perfect, water quality monitoring accuracy and good reliability's high parameter boiler water quality monitoring system to give its monitoring method.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a high parameter boiler water quality monitoring system which characterized in that: the device comprises an online phosphorus meter, a conductivity flow cell, an electric regeneration cation exchange column, a hydrogen type exchange column, a hydrogen-electricity flow guiding cell, a degassing unit, a degassing hydrogen-electricity flow guiding cell, a multi-channel conductivity meter and a programmable controller; the boiler water sample is divided into two paths for conveying, wherein one path is conveyed to an on-line phosphorus meter, the other path is conveyed to a conductivity flow cell, and the conductivity flow cell, an electric regeneration cation exchange column, a hydrogen type exchange column, a hydrogen-electricity flow guiding flow cell, a degassing unit and a degassing hydrogen-electricity flow guiding flow cell are sequentially connected according to the water flow direction; the conductivity flow cell, the hydrogen-electricity flow guiding flow cell and the degassing hydrogen flow guiding flow cell are electrically connected with the multi-channel conductivity meter through electrode wires; and the online phosphorus meter, the degassing unit and the multi-channel conductivity meter are in communication connection with the programmable controller.
Preferably, the system also comprises a main conveying pipeline, a first branch pipeline and a second branch pipeline; the main conveying pipeline, the first branch pipeline and the second branch pipeline are connected through a stainless steel three-way valve; a first needle valve and a first flowmeter are sequentially arranged on the main conveying pipeline according to the water flow direction; the first branch pipeline is connected with the online phosphorus meter, and a second needle valve is arranged on the first branch pipeline; the second branch pipeline is connected with the conductivity flow cell, and a second flowmeter is arranged on the second branch pipeline.
Preferably, the first needle valve and the second needle valve both adopt 316L stainless steel needle valves, and the first flow meter and the second flow meter both adopt glass rotameters.
Preferably, the online phosphorus meter and the degassing hydrogen conduction flow cell are communicated with a unit drainage tank through pipelines.
Preferably, the programmable controller is provided with a display interface, and parameters capable of being displayed include the conductivity of furnace water, the hydrogen conductivity, phosphate radicals and the pH value.
Preferably, the flow of the water sample in the first branch pipeline and the second branch pipeline is controlled within the range of 19-21L/h.
Preferably, the measurement range of the online phosphorus meter is 0-5.0 mg/L.
Preferably, the conductivity flow cell is provided with a conductivity electrode, the hydrogen conductivity flow cell is provided with a hydrogen conductivity electrode, the degassed hydrogen conductivity flow cell is provided with a degassed hydrogen conductivity electrode, and the conductivity electrode, the hydrogen conductivity electrode and the degassed hydrogen conductivity electrode are all electrically connected with the multi-channel conductivity meter through electrode wires; the multi-channel conductivity meter has linear, acidic and ammonia compensation functions, and the electrode constant of the multi-channel conductivity meter is 0.01cm-1Or 0.04cm-1And (4) stages.
The utility model also provides a high parameter boiler water quality monitoring method adopts foretell monitoring system to implement, its characterized in that: installing a parameter boiler water quality monitoring system on a low-temperature sampling frame of a water vapor sampling room, wherein the connected water sample is boiler water subjected to temperature and pressure reduction by the sampling frame; the furnace water sample enters a main conveying pipeline, and the flow of the furnace water sample in the main conveying pipeline is adjusted to be 40L/h through a first needle valve and a first flowmeter; the furnace water sample is branched into two paths through a stainless steel three-way valve, the flow rates of the water samples in a first branch pipeline and a second branch pipeline are adjusted to be 20L/h through adjusting a second needle valve and a second flow meter, one path of furnace water sample is conveyed to an online phosphorus meter through the first branch pipeline to measure the content of phosphate radicals, and the content of the phosphate radicals is transmitted to a programmable controller; the other path of furnace water sample is conveyed to a conductivity flow cell through a second branch pipeline, then the water sample of the path is discharged to a unit drainage tank after sequentially passing through an electric regeneration cation exchange column, a hydrogen type exchange column, a hydrogen electric flow guiding flow cell, a degassing unit and a degassing hydrogen conductivity flow cell, a multi-channel conductivity meter sequentially completes the measurement of the conductivity, the hydrogen conductivity and the degassing hydrogen conductivity of the water sample, and transmits the conductivity, the hydrogen conductivity and the degassing hydrogen conductivity to a programmable controller; and the programmable controller calculates the phosphorus and hydrogen removal conductivity and the pH value of the furnace water sample according to the obtained phosphate radical content, the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity.
Preferably, the phosphorus and hydrogen removal conductivity is calculated according to the phosphate radical content and the hydrogen conductivity, and the calculation formula is as follows:
CCDP=CCB-4.06CP
in the formula CCDPTo remove the electrical conductivity of phosphorus and hydrogen, CCBIs hydrogen conductivity, CPIs the phosphate content.
Preferably, the pH value is calculated according to the phosphate radical content, the hydrogen conductivity, the electrical conductivity and the degassed hydrogen conductivity, wherein the carbonate radical content in the furnace water can be calculated according to the degassed hydrogen conductivity and the hydrogen conductivity, the hydrogen phosphate radical content in the furnace water can be known according to the phosphate radical content, the anion content of other impurities except the hydrogen phosphate radical can be known according to the phosphorus and hydrogen conductivity, and the pH value of the furnace water can be obtained by combining with the measured electrical conductivity value.
Compared with the prior art, the utility model, have following advantage and effect:
1. the measurement result of the furnace water pH is high in accuracy, no matter which treatment process is adopted for the furnace water, the furnace water pH can be calculated through the conductivity, the hydrogen conductivity, the degassed hydrogen conductivity and the phosphate radical content, and the requirements for the calculation of the pH on accuracy and reliability are far higher than those of the measurement result of a direct electrode method;
2. the phosphorus and hydrogen removal conductivity is adopted to reflect the content of impurity anions, and the influence of phosphate radicals on the monitoring of the content of the impurity anions is eliminated;
3. compared with the prior art in which the direct method is adopted to measure the pH value of the furnace water, the system needs to carry out inspection and calibration work regularly, electrodes need to be replaced for half a year or one year, the system does not need to carry out calibration and maintenance after installation and debugging, and does not need to be replaced.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: the device comprises a first needle valve 1, a second needle valve 2, a first flowmeter 3, a second flowmeter 4, an online phosphorus meter 5, a conductivity flow cell 6, a hydrogen type exchange column 7, a hydrogen conductivity flow cell 8, a degassed hydrogen and electricity conductivity flow cell 9, a degassing unit 10, a multi-channel conductivity meter 11, a programmable controller 12, a stainless steel three-way valve 13 and an electrically regenerated cation exchange column 14.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, the embodiment discloses a high-parameter boiler water quality monitoring system, which includes a main delivery pipeline, a branch pipeline i, a branch pipeline ii, an online phosphorus meter 5, a conductivity flow cell 6, an electrically regenerated cation exchange column 14, a hydrogen type exchange column 7, a hydrogen conductivity flow cell 8, a degassing unit 10, a degassed hydrogen electrical conductivity flow cell 9, a multi-channel conductivity meter 11, and a programmable controller 12.
In the embodiment, the main conveying pipeline, the first branch pipeline and the second branch pipeline are connected through a stainless steel three-way valve 13; a first needle valve 1 and a first flowmeter 3 are sequentially arranged on the main conveying pipeline according to the water flow direction; the first branch pipeline is connected with the online phosphorus meter 5, and a second needle valve 2 is arranged on the first branch pipeline; the second branch pipeline is connected with the conductivity flow cell 6, and a second flowmeter 4 is arranged on the second branch pipeline. A needle valve 1 and a needle valve 2 both adopt 316L stainless steel needle valves, and a flow meter 3 and a flow meter 4 both adopt glass rotameters.
In the embodiment, a boiler water sample is divided into two paths for conveying, wherein one path is conveyed to the online phosphorus meter 5 through a branch pipeline, the other path is conveyed to the conductivity flow cell 6 through a branch pipeline II, and the conductivity flow cell 6, the electrically regenerated cation exchange column 14, the hydrogen type exchange column 7, the hydrogen conductivity flow cell 8, the degassing unit 10 and the degassed hydrogen electrical flow guiding flow cell 9 are sequentially connected according to the water flow direction. The online phosphorus meter 5 and the degassed hydrogen electric flow guiding tank 9 are communicated to a unit drainage tank through pipelines.
In this embodiment, the electrically regenerated cation exchange column 14 and the hydrogen-type exchange column 7 together function to replace cations, wherein most of the exchange process takes place in the electrically regenerated cation exchange column, and the hydrogen-type exchange column mainly functions as a backup. Normally, the electrically regenerated cation exchange column can be used continuously for at least one year; the hydrogen-type exchange column is replaced according to the color change condition of the resin.
In the embodiment, the conductivity flow cell 6, the hydrogen conductivity flow cell 8 and the degassed hydrogen conductivity flow cell 9 are electrically connected with the multi-channel conductivity meter 11 through electrode wires; the conductivity flow cell 6 is provided with a conductivity electrode, the hydrogen conductivity flow cell 8 is provided with a hydrogen conductivity electrode, the degassed hydrogen conductivity flow cell 9 is provided with a degassed hydrogen conductivity electrode, and the conductivity electrode, the hydrogen conductivity electrode and the degassed hydrogen conductivity electrode are electrically connected with the multi-channel conductivity meter 11 through electrode wires; the multi-channel conductivity meter 11 has linearityAcid and ammonia compensation function, and the electrode constant of the acid and ammonia compensation function is 0.01cm-1Or 0.04cm-1And (4) stages.
In this embodiment, the degassing unit 10, the online phosphorus meter 5 and the multi-channel conductivity meter 11 are all communicatively connected to a programmable controller 12. And the online phosphorus meter 5 and the multi-channel conductivity meter 11 input the measurement result into the programmable controller 12 through a 4-20 mA current signal, the programmable controller 12 is provided with a display interface, and parameters capable of being displayed comprise key parameters such as the conductivity of furnace water, the hydrogen conductivity, phosphate radical, pH value and the like.
In this embodiment, the flow rate of the water sample in the first branch pipeline and the second branch pipeline is controlled at 20L/h. The measurement range of the online phosphorus meter 5 is 0-5.0 mg/L, the error of the indication value of the instrument is within the range of +/-1% FS, and periodic calibration can be automatically carried out online.
In this embodiment, considering the possible presence of carbonate in the furnace water, there is an influence on the calculation of the pH of the furnace water. The monitoring system is provided with a degassing unit 10 at the outlet of a hydrogen conductivity flow cell 8, removes carbon dioxide in the effluent of a hydrogen type exchange column 7, measures the conductivity of degassed hydrogen, and eliminates the influence of carbonate in furnace water on the calculation of a pH value.
In this embodiment, in order to accurately measure the hydrogen conductivity of the furnace water, the measurement accuracy and the operation cycle can be ensured simultaneously by connecting the electrically regenerated cation exchange column 14 and the hydrogen type exchange column 7 in series. The hydrogen type exchange column 7 is a color-changing cation exchange column made of transparent organic glass, and the resin is replaced when the exchange column resin is failed 2/3. In order to ensure the measurement continuity of the hydrogen conductivity of the furnace, an electrically regenerated cation exchange column 14 is arranged in front of the color-changing cation exchange column, most cations in water are removed by the electrically regenerated cation exchange column 14, and the color-changing cation exchange column only plays a role in improving the accuracy and standby application, so that the hydrogen conductivity measurement can be continuously carried out for a long time.
In this embodiment, a method for monitoring water quality of boiler water of a high-parameter boiler is also provided, which is implemented by using the monitoring system, and the monitoring method comprises: installing a parameter boiler water quality monitoring system on a low-temperature sampling frame of a water vapor sampling room, wherein the connected water sample is boiler water subjected to temperature and pressure reduction by the sampling frame; the furnace water sample enters a main conveying pipeline, and the flow of the furnace water sample in the main conveying pipeline is adjusted to be 40L/h through a first needle valve 1 and a first flowmeter 3; the furnace water sample is branched into two paths through a stainless steel three-way valve 13, the flow rates of the water samples in a first branch pipeline and a second branch pipeline are adjusted to be 20L/h through adjusting a second needle valve 2 and a second flow meter 4, one path of the furnace water sample is conveyed to an online phosphorus meter 5 through the first branch pipeline to measure the content of phosphate radicals, and the content of the phosphate radicals is transmitted to a programmable controller 12; the other path of furnace water sample is conveyed to the conductivity flow cell 6 through a second branch pipeline, then the water sample of the path is discharged to a unit drainage tank after sequentially passing through the electric regeneration cation exchange column 14, the hydrogen type exchange column 7, the hydrogen conductivity flow cell 8, the degassing unit 10 and the degassed hydrogen conductivity flow cell 9, the multi-channel conductivity meter 11 sequentially completes the measurement of the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity of the water sample, and the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity are transmitted to the programmable controller 12; and the programmable controller 12 calculates the phosphorus and hydrogen removal conductivity and the pH value of the furnace water sample according to the obtained phosphate radical content, the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity.
In this embodiment, the phosphorus and hydrogen removal conductivity is calculated according to the phosphate radical content and the hydrogen conductivity, and the calculation formula is as follows:
CCDP=CCB-4.06CP
in the formula CCDPTo remove the electrical conductivity of phosphorus and hydrogen, CCBIs hydrogen conductivity, CPIs the phosphate content.
In this embodiment, the pH value is derived from a pH value calculation model, which only has 4 input variables of electrical conductivity, hydrogen conductivity, degassed hydrogen conductivity, and phosphate content, wherein the degassed hydrogen conductivity and the hydrogen conductivity can be used to calculate the carbonate content in the furnace water, the phosphate content can be used to calculate the hydrogen carbonate content in the furnace water, the phosphate conductivity can be used to calculate the anion content of other impurities except hydrogen phosphate, and the measured value of the electrical conductivity is combined to obtain the pH value of the furnace water.
In this embodiment, all 4 variables included in the pH calculation model can be accurately measured, thereby ensuring the accuracy of the pH calculation. The pH value calculation model realizes accurate calculation of the furnace water pH value, avoids various problems existing in the process of directly measuring the furnace water pH value by using a pH value meter, greatly improves the accuracy and the reliability of the furnace water pH value measurement, reflects the content of impurity anions by removing the phosphorus and hydrogen conductivity, and eliminates the influence of phosphate radicals on the monitoring of the content of the impurity anions.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the patent idea of the utility model are included in the protection scope of the patent of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. The utility model provides a high parameter boiler water quality monitoring system which characterized in that: the device comprises an online phosphorus meter (5), a conductivity flow cell (6), an electrically regenerated cation exchange column (14), a hydrogen type exchange column (7), a hydrogen-electricity flow guiding flow cell (8), a degassing unit (10), a degassed hydrogen-electricity flow guiding flow cell (9), a multi-channel conductivity meter (11) and a programmable controller (12); the boiler water sample is divided into two paths for conveying, wherein one path is conveyed to an on-line phosphorus meter (5), the other path is conveyed to a conductivity flow cell (6), and the conductivity flow cell (6), an electrically regenerated cation exchange column (14), a hydrogen type exchange column (7), a hydrogen-electricity flow guiding flow cell (8), a degassing unit (10) and a degassing hydrogen-electricity flow guiding flow cell (9) are sequentially connected according to the water flow direction; the conductivity flow cell (6), the hydrogen-electricity flow guiding cell (8) and the degassed hydrogen-electricity flow guiding cell (9) are electrically connected with the multi-channel conductivity meter (11) through electrode wires; the online phosphorus meter (5), the degassing unit (10) and the multi-channel conductivity meter (11) are all in communication connection with a programmable controller (12).
2. The high-parameter boiler water quality monitoring system of claim 1, characterized in that: the system also comprises a main conveying pipeline, a first branch pipeline and a second branch pipeline; the main conveying pipeline, the first branch pipeline and the second branch pipeline are connected through a stainless steel three-way valve (13); a needle valve (1) and a flowmeter (3) are sequentially arranged on the main conveying pipeline in the water flow direction; the first branch pipeline is connected with the online phosphorus meter (5), and a second needle valve (2) is arranged on the first branch pipeline; the second branch pipeline is connected with the conductivity flow cell (6), and a second flow meter (4) is arranged on the second branch pipeline.
3. The high parameter boiler water quality monitoring system of claim 2, characterized in that: a needle valve (1) and No. two needle valves (2) all adopt 316L stainless steel needle valve, and a flowmeter (3) and No. two flowmeters (4) all adopt glass rotameter.
4. The high-parameter boiler water quality monitoring system of claim 1, characterized in that: and the online phosphorus meter (5) and the degassed hydrogen electric flow guiding tank (9) are communicated to a unit drainage tank through pipelines.
5. The high-parameter boiler water quality monitoring system of claim 1, characterized in that: the programmable controller (12) is provided with a display interface, and parameters capable of being displayed include the conductivity of furnace water, the hydrogen conductivity, phosphate radicals and the pH value.
6. The high parameter boiler water quality monitoring system of claim 2, characterized in that: and the flow of the water samples in the first branch pipeline and the second branch pipeline is controlled within the range of 19-21L/h.
7. The high-parameter boiler water quality monitoring system of claim 1, characterized in that: the measurement range of the online phosphorus meter (5) is 0-5.0 mg/L.
8. The high-parameter boiler water quality monitoring system of claim 1, characterized in that: the conductivity flow cell (6) is provided with a conductivity electrode, the hydrogen conductivity flow cell (8) is provided with a hydrogen conductivity electrode, the degassed hydrogen conductivity flow cell (9) is provided with a degassed hydrogen conductivity electrode, and the conductivity electrode, the hydrogen conductivity electrode and the degassed hydrogen conductivity electrode are electrically connected with the multi-channel conductivity meter (11) through electrode wires; the multi-channel conductivity meter (11) has the functions of linearity, acidity and ammonia compensation, and the electrode constant of the multi-channel conductivity meter is 0.01cm-1Or 0.04cm-1And (4) stages.
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