CN2497304Y - On-line cooling-water corrosion-rate and fouling thermal resistance integrated monitoring instrument - Google Patents
On-line cooling-water corrosion-rate and fouling thermal resistance integrated monitoring instrument Download PDFInfo
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- CN2497304Y CN2497304Y CN 01250967 CN01250967U CN2497304Y CN 2497304 Y CN2497304 Y CN 2497304Y CN 01250967 CN01250967 CN 01250967 CN 01250967 U CN01250967 U CN 01250967U CN 2497304 Y CN2497304 Y CN 2497304Y
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- operational amplifier
- corrosion
- electronic switch
- cpu
- phase end
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Abstract
An online cooling water corrosion speed and dirt thermal resistance integration monitor consists of a corrosion speed measuring module, a temperature measuring module, etc. A measuring probe is connected with a D/A converter respectively by the corrosion speed measuring module, the temperature measuring module, and a first electronic switch; the output end of the D/A converter is connected with a CPU which is connected with a computer in a controlling room by a communication interface and respectively sends the controlling signal to the corrosion and temperature measuring passage selection circuit by a second electronic switch; the two measuring passage selection circuit output signals are the corrosion speed measuring module and temperature measuring module input signal. The utility model can implement long-distance control and avoid multi-time repeated manpower site operations.
Description
Technical field
The utility model relates to industrial cooling circulating water system corrosion and dirtiness resistance monitoring technology, specifically a kind of online cooling water corrosion speed and the integrated monitor of dirtiness resistance.
Background technology
Water cooler corrosion and fouling are the main harm that cold exchange device damages and efficient reduces.Water quality stabilizers such as the comprehensive agent of industry many application corrosion-mitigation scale-inhibition at present carry out comprehensive test to cooling water corrosion and two indexs of fouling, and it is helpful that its result correctly uses anticorrosion, good antiscale property medicament to the scene.Its weak point is to use artificial execute-in-place, it is untimely to obtain data, labor capacity is big, for realizing the scientific and effective management of recirculating cooling water system, guarantee that recirculated cooling water hangs down rate of corrosion, low dirt deposition rate operation, be necessary that foundation is corroded and fouling situation real time on-line monitoring system is grasped equipment operation condition at any time, and then instruct and produce.
Summary of the invention
The purpose of this utility model provides a kind of online cooling water corrosion speed and the integrated monitor of dirtiness resistance that can realize Long-distance Control.
The technical solution of the utility model is: provide operating voltage with power module, by the corrosion rate measurement module, temperature-measuring module, measure channel selection circuit, electronic switch, analog to digital converter, and CPU (central processing unit) is a single-chip microcomputer, data memory, program storage, clock circuit, LCD, communication interface is formed, wherein: from the measure field corrosion probe, the corrosion speed of temp probe and dirtiness resistance signal connect analog to digital converter by first electronic switch respectively behind rate of corrosion measurement module and temperature-measuring module, analog to digital converter output termination CPU (central processing unit), CPU (central processing unit) is provided with clock, program storage and data-carrier store, its control signal is connected to corrosion respectively through second electronic switch, the temperature survey channel selection circuit, described two measurement channel selection circuit output signals are the input signal of rate of corrosion measurement module and temperature-measuring module, CPU (central processing unit) links to each other with computing machine in the pulpit through communication interface, and its output signal is delivered to LCD;
Described rate of corrosion measurement module links to each other with the corrosion measurement channel selection circuit with four paths, by sampling holder, second～the 8th operational amplifier and the three～the quadrielectron switch are formed, wherein: the second operational amplifier negative phase end signal links to each other with the polarizing voltage E1～E4 that comes through the power module conversion, its in-phase end ground connection, its output terminal to the three operational amplifier in-phase ends, simultaneously through the 3rd resistance with four-operational amplifier in-phase end ground connection, the 3rd operational amplifier negative phase end links to each other with quadrielectron switch, it exports the four-operational amplifier negative phase end to, the four-operational amplifier output signal connects first electronic switch, described quadrielectron switch S 1～S4 path is respectively through measuring sonde and the 5th～the 8th operational amplifier to the three electronic switches, the 3rd electronic switch output terminal is connected to sampling holder, another input end of sampling holder is connected with CPU (central processing unit) through second electronic switch, and it exports the second operational amplifier negative phase end to; Described the 5th～the 8th operational amplifier negative phase end and output terminal short circuit are together; Described measuring sonde has three electrode RE, WE, CE, and wherein: WE is a working electrode, ground connection; RE is a reference electrode, links to each other with the five～eight operational amplifier in-phase end; CE is an auxiliary electrode, receives the 3rd operational amplifier negative phase end by quadrielectron switch; Described temperature-measuring module links to each other with the measurement channel selection circuit with 16 paths, form by the 5th electronic switch and the 9th～20 four-operational amplifiers, wherein be connected with analog to digital converter by the 5th electronic switch, each path adopts the 9th～20 four-operational amplifier to be connected with S1～516 respective end in the 3rd electronic switch respectively, the the 9th～20 four-operational amplifier in-phase end is connected with temperature sensor, and through the 7th resistance eutral grounding, its negative phase end and output terminal short circuit are together.
The utility model corrosion speed measuring principle:
The utility model utilizes the weak polarization measurement principle of galvanochemistry, and its polarization scope is 5～40mv, and maximum polarization value is at weak polarized area, and measuring sonde adopts three electrode probes of making of material of the same race.
The utility model dirtiness resistance measuring principle:
When cold exchange device had run to certain sediment, cold fluid and hot fluid was imported and exported the temperature difference and will be changed, and corresponding pipe internal surface heat transfer coefficient is by initial value K
0Become k
t, heat transfer coefficient is not K when wherein having dirt deposition
0, heat transfer coefficient was k when dirt deposition was arranged
t,
k
t＝2G
*Cp(t
2-t
1)/A[(T
1-t
2)+(T
2-t
1)]
In the formula: G---by the discharge of test line;
The specific heat at constant pressure of Cp---water under service condition;
t
1,, t
2---the out temperature of cold fluid;
A---the effective heat transfer area of test tube;
T
1, T
2The out temperature of-hot fluid.
The utility model is under the constant situation of flow, and monitor temperature obtains heat transfer coefficient, and calculates dirtiness resistance by the K value:
R
t＝1/K
t-1/K
0
The K value is big more, illustrates that dirt deposition is few, good effect of heat exchange, and the K value is more little, illustrates that the thermal resistance that dirt causes is big, the heat exchange weak effect, and can directly clean according to the K value in good time.
The utlity model has following advantage:
1. the utility model can be realized instrument and computer remote communication, on-line monitoring, can in time obtain data, and avoid repeated artificial execute-in-place.The utility model belongs to and to integrate online industrial colling corrosion speed, the dirtiness resistance monitoring device that corrosion and fouling are monitored, its realistic demand.
2. the utility model is the electrochemical method of a kind of energy rapid sensitive, the instantaneous corrosion speed of continuous coverage, theoretical error is little, measures and adopts three electrode probes of making of material of the same race, can be to corrosion and fouling situation real time on-line monitoring, at any time grasp equipment operation condition, and then instruct and produce; The corrosivity result of monitoring chilled water of the present utility model is used for judging the effect of anticorrosion, good antiscale property dispensing, also can adjust the dosing cycle.
Description of drawings
Fig. 1 is the utility model circuit block diagram.
Fig. 2 is a rate of corrosion measurement module schematic diagram among Fig. 1.
Fig. 3 is a temperature-measuring module schematic diagram among Fig. 1.
Fig. 4 is the utility model embodiment scheme of installation.
Fig. 5 is the utility model embodiment corrosion speed change curve in time.
Fig. 6 is the utility model embodiment heat transfer coefficient k change curve in time.
Embodiment
Below in conjunction with drawings and Examples in detail the utility model is described in detail.
Shown in Fig. 1～3, the utility model provides operating voltage with power module 5, by corrosion rate measurement module 3, temperature-measuring module 4, measurement channel selection circuit, electronic switch, modulus converter A/D, and central processing unit CPU is single-chip microcomputer, data memory E
2PROM, program storage EPROM, clock circuit Clock, LCD LED, communication interface 6 are formed, wherein: corrosion speed and dirtiness resistance signal from measure field corrosion probe, temp probe connect modulus converter A/D by the first electronic switch K1 respectively behind rate of corrosion measurement module 3 and temperature-measuring module 4, modulus converter A/D output termination central processing unit CPU, central processing unit CPU is provided with clock Clock, and other is provided with program storage EPROM and data-carrier store E
2PROM, its control signal is connected to burn into temperature survey channel selection circuit 1,2 respectively through the second electronic switch K2, described two measurement channel selection circuit output signals are the input signal of rate of corrosion measurement module 3 and temperature-measuring module 4, central processing unit CPU links to each other with computing machine in the pulpit through communication interface 6, and its output signal is delivered to LCD LED;
Described rate of corrosion measurement module 3 links to each other with the corrosion measurement channel selection circuit 1 with four paths, by sampling holder A1, second～the 8th operational amplifier A 2～A8, the three～the quadrielectron K switch 3～K4 and first～the 6th resistance R 1～R6 form, wherein: second operational amplifier A, 2 negative phase end signals link to each other with the polarizing voltage E1～E4 that comes through power module 5 conversion by second resistance R 2, its in-phase end ground connection, its output terminal to the three operational amplifier A 3 in-phase ends, simultaneously through the 3rd resistance R 3 with four-operational amplifier A4 in-phase end ground connection, the 3rd operational amplifier A 3 negative phase ends link to each other with quadrielectron K switch 4, its output is through the 4th resistance R 4 to four-operational amplifier A4 negative phase ends, four-operational amplifier A4 output signal meets the first electronic switch A1, described quadrielectron K switch 4S1～S4 path is respectively through measuring sonde and the 5th～the 8th operational amplifier A 5～A8 to the three electronic switch K3, the 3rd electronic switch K3 output terminal is connected to sampling holder A1, another input end of sampling holder A1 is connected with central processing unit CPU through the second electronic switch K2, and it is exported through first resistance R, 1 to second operational amplifier A, 2 negative phase ends; Described the 5th～the 8th operational amplifier A 5～A8 negative phase end and output terminal short circuit are together; Cross-over connection the 5th resistance R 5 between four-operational amplifier A4 negative phase end and output terminal, cross-over connection one adjustable the 6th resistance R 6 between the 3rd operational amplifier A 3 negative phase ends and output terminal;
Described measuring sonde has three electrode RE, WE, CE, and wherein: WE is a working electrode, ground connection; RE is a reference electrode, links to each other with the five～eight operational amplifier in-phase end; CE is an auxiliary electrode, receives the 3rd operational amplifier A 3 negative phase ends by quadrielectron switch A4;
Described temperature-measuring module 11 links to each other with the measurement channel selection circuit 9 with 16 paths, form by the 5th electronic switch K5 and the 9th～20 four-operational amplifier A9～A24, wherein be connected with modulus converter A/D by the 5th electronic switch K5, each path adopts the 9th～20 four-operational amplifier A9～A24 to be connected with S1～S16 respective end in the 3rd electronic switch respectively, the the 9th～20 four-operational amplifier A9～A24 in-phase end is connected with 4～20Am temperature sensor TP, and through the 7th resistance R 7 ground connection, its negative phase end and output terminal short circuit are together.
The utility model can be monitored 4 heat interchanger simultaneously, can connect 1～4 corrosion probe and 4～16 temp probes, corrosion probe probes into pipeline and contacts with aqueous medium, heat interchanger cold fluid out temperature probes in the pipeline and contacts with medium, hot fluid out temperature probe is bundled in outside the tube wall, and temperature-sensing element (device) keeps well contacting with tube wall.1 corrosion probe and 4 corresponding 1 heat interchanger of temp probe, corrosion probe is installed on the cold fluid discharge pipe, is controlled corrosion speed and temperature sampling in turn, computing and storage by central controller CPU.
Embodiment
As shown in Figure 4, adopt the corrosion and the fouling situation of the utility model monitoring water cooling heat exchanger.10 1 of corrosion probes are installed at circulating water outlet place at heat interchanger, temp probe 9 is installed in import and export at cold flow and hot-fluid respectively, this device is installed in scene (flame proof), and computing machine 7 and data conversion module 8 are placed on Control Room, is connected by the device of cable with the scene.
The utility model is installed in the scene, with 10～50 meters of tested probe distances that are installed on the heat interchanger 11, data conversion module 8 through being installed in the pulpit links to each other with computing machine 7 and constitutes a supervisory system, and employing the utility model is regularly measured, image data, and is delivered to computing machine 7 in real time; The maximum transmission distance of field instrumentation and Control Room is 1200 meters.Described data transmission module 8 adopts RS485-RS232, and maximum can drive 255 playscript with stage directions utility model monitors, and therefore can expand becomes the distributed monitoring net, enlarges its range of application;
The power supply of supervisory system: the utility model is powered by 220V, and providing the 15V DC voltage by computing machine 7 main frames is data transmission module 8 power supplies;
Described communication interface 6 adopts the MAX487 chip, and operational amplifier adopts the LM2902 chip; Data-carrier store E
2PROM adopts 28C256, and program storage EPROM adopts the 27C128 chip; Clock Clock adopts DS12887; Central controller CPU adopts the 80C31 chip; Modulus converter A/D adopts the ICL7109 chip; Electronic switch adopts the CD4051 device; LCD LED is MED24064.
Shown in Fig. 5,6, for described heat interchanger 11 in acid cleaning process and the rate of corrosion of front and back and the variation of dirtiness resistance, corrosion speed is obviously increased by original 0.04mm/a during pickling, is 0.8mm/a to the maximum, descends gradually after the pickling and tends towards stability.It then is that the rate of corrosion that hanging slice method records in the cistern before the pickling is 0.02～0.03mm/a owing to add the result of acid during pickling that rate of corrosion increases, and monitoring result and lacing film result are approaching, illustrate that data are reliable.The measurement result of dirtiness resistance is that heat transfer coefficient is 800W/ ℃ of m before the pickling
2, some fluctuation in acid cleaning process, pickling increases to 1000W/ ℃ of m after finishing
2, heat transfer coefficient increases, and illustrates that the dirtiness resistance value reduces, and the heat exchange effect of heat interchanger improves.
Claims (4)
1. online cooling water corrosion speed and the integrated monitor of dirtiness resistance, provide operating voltage with power module (5), it is characterized in that: by corrosion rate measurement module (3), temperature-measuring module (4), measurement channel selection circuit, electronic switch, analog to digital converter (A/D), and CPU (central processing unit) (CPU) is single-chip microcomputer, data memory (E
2PROM), program storage (EPROM), clock circuit (Clock), LCD (LED), communication interface (6) are formed, wherein: corrosion speed and dirtiness resistance signal from measure field corrosion probe, temp probe connect analog to digital converter (A/D) by first electronic switch (K1) respectively behind rate of corrosion measurement module (3) and temperature-measuring module (4), analog to digital converter (A/D) output termination CPU (central processing unit) (CPU), CPU (central processing unit) (CPU) is provided with clock (Clock), program storage (EPROM) and data-carrier store (E
2PROM), its control signal is connected to burn into temperature survey channel selection circuit (1,2) respectively through second electronic switch (K2), described two measurement channel selection circuit output signals are the input signal of rate of corrosion measurement module (3) and temperature-measuring module (4), CPU (central processing unit) (CPU) links to each other with computing machine in the pulpit through communication interface (6), and its output signal is delivered to LCD (LED).
2. according to described online cooling water corrosion speed of claim 1 and the integrated monitor of dirtiness resistance, it is characterized in that: described rate of corrosion measurement module (3) links to each other with the corrosion measurement channel selection circuit (1) with four paths, by sampling holder (A1), second～the 8th operational amplifier (A2～A8) and the three～the quadrielectron switch (K3～K4) form, wherein: second operational amplifier (A2) negative phase end signal links to each other with the polarizing voltage E1～E4 that comes through power module (5) conversion, its in-phase end ground connection, its output terminal to the three operational amplifiers (A3) in-phase end, simultaneously through the 3rd resistance (R3) with four-operational amplifier (A4) in-phase end ground connection, the 3rd operational amplifier (A3) negative phase end links to each other with quadrielectron switch (K4), it exports four-operational amplifier (A4) negative phase end to, four-operational amplifier (A4) output signal connects first electronic switch (A1), described quadrielectron switch (K4) S1～S4 path is respectively through measuring sonde and the 5th～the 8th operational amplifier (A5～A8) to the 3rd electronic switch (K3), the 3rd electronic switch (K3) output terminal is connected to sampling holder (A1), another input end of sampling holder (A1) is connected with CPU (central processing unit) (CPU) through second electronic switch (K2), and it exports second operational amplifier (A2) negative phase end to; (negative phase end of A5～A8) and output terminal short circuit are together for described the 5th～the 8th operational amplifier.
3. according to described online cooling water corrosion speed of claim 2 and the integrated monitor of dirtiness resistance, it is characterized in that: described measuring sonde has three electrode RE, WE, CE, and wherein: WE is a working electrode, ground connection; RE is a reference electrode, links to each other with the five～eight operational amplifier in-phase end; CE is an auxiliary electrode, receives the 3rd operational amplifier (A3) negative phase end by quadrielectron switch (A4).
4. according to described online cooling water corrosion speed of claim 1 and the integrated monitor of dirtiness resistance, it is characterized in that: described temperature-measuring module (11) links to each other with the measurement channel selection circuit (9) with 16 paths, by the 5th electronic switch (K5) and the 9th～20 four-operational amplifier (A9～A24) form, wherein be connected with analog to digital converter (A/D) by the 5th electronic switch (K5), each path adopts the 9th～20 four-operational amplifier (A9～A24) be connected with S1～S16 respective end in the 3rd electronic switch respectively, (A9～A24) in-phase end is connected with temperature sensor (TP) the 9th～20 four-operational amplifier, and through the 7th resistance (R7) ground connection, its negative phase end and output terminal short circuit are together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01250967 CN2497304Y (en) | 2001-10-10 | 2001-10-10 | On-line cooling-water corrosion-rate and fouling thermal resistance integrated monitoring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01250967 CN2497304Y (en) | 2001-10-10 | 2001-10-10 | On-line cooling-water corrosion-rate and fouling thermal resistance integrated monitoring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2497304Y true CN2497304Y (en) | 2002-06-26 |
Family
ID=33661020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01250967 Expired - Fee Related CN2497304Y (en) | 2001-10-10 | 2001-10-10 | On-line cooling-water corrosion-rate and fouling thermal resistance integrated monitoring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2497304Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706387A (en) * | 2012-05-31 | 2012-10-03 | 苏州市金翔钛设备有限公司 | Dirty factor detection device for condenser |
| CN112798644A (en) * | 2020-12-28 | 2021-05-14 | 武汉大学 | Film thermal resistance measuring system and method for evaluating corrosion degree and pickling and passivation effects of hollow copper conductor of generator |
-
2001
- 2001-10-10 CN CN 01250967 patent/CN2497304Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706387A (en) * | 2012-05-31 | 2012-10-03 | 苏州市金翔钛设备有限公司 | Dirty factor detection device for condenser |
| CN112798644A (en) * | 2020-12-28 | 2021-05-14 | 武汉大学 | Film thermal resistance measuring system and method for evaluating corrosion degree and pickling and passivation effects of hollow copper conductor of generator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020626 Termination date: 20101010 |