CN104634723A - Metal corrosion speed detection method and metal corrosion speed detection device - Google Patents
Metal corrosion speed detection method and metal corrosion speed detection device Download PDFInfo
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- CN104634723A CN104634723A CN201510012764.7A CN201510012764A CN104634723A CN 104634723 A CN104634723 A CN 104634723A CN 201510012764 A CN201510012764 A CN 201510012764A CN 104634723 A CN104634723 A CN 104634723A
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Abstract
The invention discloses a metal corrosion speed detection method and a metal corrosion speed detection device. The metal corrosion speed detection device comprises a detection unit and a data processing unit; the detection unit is connected to a fed sample water flow inlet, the detection unit comprises a dissolved hydrogen measurer and an electronic flowmeter, which are connected together in series by virtue of a pipeline; the dissolved hydrogen measurer is used for detecting the content of dissolved hydrogen molecules in the fed sample water flow in a unit time; the electronic flowmeter is used for detecting the volume of the water flow in a unit time; the detection unit is used for transmitting the measured content of the dissolved hydrogen molecules in the unit time and the volume of the fed sample water flow in the unit time to the data processing unit; the data processing unit receives numerical values measured by the dissolved hydrogen measurer and the electronic flowmeter and calculates the metal corrosion speed of a heated pipeline by which the fed sample water flow flows according to the numerical values. By adopting the metal corrosion speed detection method and the metal corrosion speed detection device, the metal corrosion speed of the pipeline on a heated surface of a fire power generation system boiler can be dynamically detected on line, and the explosion and leakage accident of a furnace tube can be prevented.
Description
Technical field
The present invention relates to a kind of metal erosion speed detection method and pick-up unit, calculate pipeline metal erosion speed of being heated, for the on-line monitoring of Thermal Equipments of Thermal Power Plants by the concentration of dissolved hydrogen in testing pipes current.
Background technology
Genset in heating power production run due to boiler tube be in high temperature, high pressure for a long time under run, start frequently during adding current peak load regulation network, stop transport and reality for subsequent use, metal material in heat power equipment (particularly water-cooling wall and superheater) is among thermal stress and mechanical stress for a long time, very easily corrodes.Corrosion is the most immediate cause that heat power equipment damages, and the threat formed power plant safety economy, steady production is very serious.
The On-Line Dynamic Monitoring of strengthening research and solution heating surface furnace tube material corrosion speed in process of production for this reason; to make specific aim safeguard measure to boiler tube in time; heating surface metal material is prevented to lose efficacy; prevention bolier tube failure accident occurs, and prolonged boiler service life of equipment just becomes the current significant technology issues can not avoided and must research and solve as early as possible.
Summary of the invention
The present invention discloses a kind of metal erosion speed detection method and pick-up unit, be applied in thermal power generation system, by recording the concentration of the hydrogen molecule in heating surface boiler tube in steam sample introduction current, the Acidity of Aikalinity of bonded boiler evaporation capacity and steam sample introduction current, can calculate the corrosion speed of metal material.
The present invention is implemented by following technical proposal:
The present invention discloses a kind of metal erosion speed detection method, and this detection method was included in the unit interval carries out following steps:
S1: the concentration detecting hydrogen molecule in sample introduction current;
S2: the evaporation capacity detecting tested boiler;
S3: determine the acid of sample introduction current, alkalescence;
S4: utilize formula V=(KQH
2/ A) × 10
-2, calculate the metal erosion speed of heating surface piping;
In formula, V-metal erosion speed (mm/a);
K-constant;
The evaporation capacity (t/h) of the tested boiler of Q-;
H
2the concentration (μ g/l) of hydrogen molecule in-sample introduction current;
A-heating surface area (m
2);
Wherein, the sequencing of S1, S2, S3 can exchange or carry out simultaneously.
S1 comprises the steps:
S11: the content detecting the hydrogen molecule in sample introduction current;
S12: the fluid volume detecting sample introduction current;
S13: the concentration calculating hydrogen molecule in sample introduction current;
Wherein, the order of S11, S12 can be exchanged or be carried out simultaneously.
Before the concentration measuring the hydrogen molecule in sample introduction current, can also comprise detection, control the step S0 of sample introduction water flow temperature within allowed band, S0 comprises:
S00: the temperature detecting sample introduction current;
S01: the sample introduction water flow temperature recorded and permissible value are compared, judges that whether sample introduction water flow temperature is lower than permissible value: when the temperature of sample introduction current is lower than permissible value, then carry out S1; When the temperature of sample introduction current is higher than permissible value, then according to work on the spot needs, can select to carry out S02 or S03;
S02: cool sample introduction current, until temperature is lower than permissible value, then carries out S1;
S03: report to the police, sample introduction current are directly discharged.
The present invention also discloses a kind of metal erosion speed detector, comprise: detecting unit and data processing unit, detecting unit comprises: dissolved hydrogen measuring instrument, be connected to sample introduction flow inlet, it detects the content of dissolved hydrogen molecule in sample introduction current in unit interval, by the data transfer that records to data processing unit, electronic flow-meter, together with dissolved hydrogen measuring instrument placed in series, it detects the volume of sample introduction current in this unit interval, by the data transfer that records to data processing unit; Described data processing unit receives described dissolved hydrogen measuring instrument and the numerical value measured by electronic flow-meter, and based on described numerical evaluation go out described sample introduction current flow through the metal erosion speed of the pipeline that is heated.
Described data processing unit formula V=(KQH
2/ A) × 10
-2calculate the metal erosion speed of the pipeline that is heated that sample introduction current flow through, wherein,
V-metal erosion speed,
K-constant,
The evaporation capacity of the tested boiler of Q-,
H
2the concentration of hydrogen molecule in-sample introduction current,
A-heating surface area.
In the present invention, because of hydrogen molecule extremely unstable in water sample, easily separate out loss, in order to the result recorded is more accurate, dissolved hydrogen measuring instrument is connected to the entrance of sample introduction current by pipeline.
Sampling pipe because of boiler tubing to be measured is capstan, in order to ensure the concentration stabilize flowing through hydrogen molecule in the sample introduction current of dissolved hydrogen measuring instrument better, then after electronic flow-meter, go back series seal unit, namely sealing unit is connected with described electronic flow-meter by pipeline, and sample introduction current flow through described dissolved hydrogen measuring instrument, electronic flow-meter and sealing unit successively.
Metal erosion speed detector of the present invention also can comprise sample introduction control module, and control A, B two-way water sample enters pick-up unit in turn.Control module specifically comprises: A road water sample flow rate regulating valve, is connected with the sampling line of the heating surface A road boiler tube of thermal power generation system; B road water sample flow rate regulating valve, is connected with the sampling line of the heating surface B road boiler tube of thermal power generation system; Measuring object cross-over valve communicates with described detecting unit and described A, B road water sample flow rate regulating valve respectively.
A temperature sensor is provided with between A road water sample flow rate regulating valve and measuring object cross-over valve, between B road water sample flow rate regulating valve and measuring object cross-over valve, be provided with B temperature sensor, the temperature recorded is sent to data processing unit by A, B temperature sensor.
Metal erosion speed detector of the present invention also can comprise cooling unit further, is arranged on the porch of sample introduction control module, comprises coolant valve, heat exchanger and the outlet valve of connecting successively; Before coolant valve is connected to water sample flow rate regulating valve, outlet valve connects measuring object cross-over valve; C temperature sensor is provided with in described heat exchanger.
The result recorded is sent to data processing unit by C temperature sensor, and coolant valve and outlet valve are subject to the control of data processing unit.
Above-mentioned all pipelines all adopt stainless steel pipes.
Metal erosion speed detector of the present invention also can comprise heat power engineering signal instrument and the pH value sensors such as the steam flow tester measuring boiler capacity to be measured further, and the result of measurement is sent to data processing unit by steam flow tester and pH value sensor.
Data processing unit has display screen, is used for display measurement result.
Above-mentioned dissolved hydrogen measuring instrument comprises potential electrode and pole cup, and pole cup bottom is with inlet, and potential electrode, with liquid outlet, is surrounded by top; Described potential electrode comprises: electrode stem; Be wrapped in the negative electrode on electrode stem; Electrode jacket, is enclosed in outside described negative electrode and electrode stem, is full of electrolytic solution in electrode jacket; Positive electrode, be fixed on electrode stem head, one end protrudes from electrode jacket, and one end extend in electrode stem; Electrode film, covers position positive electrode being fixed on electrode jacket wall; Wherein, the signal recorded is drawn by wire by described negative electrode and described positive electrode.
Metal erosion speed detector of the present invention also comprises mold pressing cap, and described mold pressing cap is fixed on described electrode jacket, is compressed by described electrode film.
Above-mentioned electrode jacket wall is also provided with removable seal, is used for supplementary electrolytic solution.
Or metal erosion speed detector also comprises pH value sensor further and measures the steam flow tester of boiler capacity to be measured, and the result of measurement is sent to data processing unit by described pH value sensor and steam flow tester.
Metal erosion speed device for dynamically detecting of the present invention can be connected directly between in the heat power generating system worked; hydrogen meltage in dynamic monitoring heating surface boiler tube in water; thus calculate the real-time corrosion speed of metal tube; detection method is simple, easy to operate; make operating personnel can make specific aim safeguard measure to boiler tube in time; prevent heating surface metal material to lose efficacy, prevention bolier tube failure accident occurs, prolonged boiler service life of equipment.
The present invention records the metal erosion speed of heating surface boiler tube, has important positive effect to thermal power generation system:
(1) passive state and the effect thereof of boiler heating surface metal material can be judged.After boiler startup, particularly initiating switchup after pickling, whether its heating surface metal material forms natural oxide film soon and proceeds to passive state, analyze data by the dissolved hydrogen in the present invention, those skilled in the art just can judge and the actual state that the permanent passivating film evaluating boiler tube is set up;
(2) optimize and screen anticorrosion treatment technology technology in different pots, can judge and the actual effect evaluating different anticorrosion process.Application the present invention carries out above-mentioned evaluation and screening, more more convenient, directly perceived and reliable than methods such as iron-holder in employing mensuration sample introduction current;
(3) being reason, character and boiler tube condition in damaged that the on-the-spot furnace tube material of analysis and research corrodes, providing reliable historical measurement data as analyzing the foundation judged, vital effect is served to prevention bolier tube failure accident.
Accompanying drawing explanation
Fig. 1 is metal erosion speed detection method process flow diagram of the present invention;
Fig. 2 is the functional block diagram of metal erosion speed detector of the present invention;
Fig. 3 is the schematic diagram of metal erosion speed detector structure of the present invention;
Fig. 4 A is the sample introduction control module schematic diagram with temperature sensor;
Fig. 4 B is cooling unit and sample introduction control module schematic diagram;
Fig. 5 A is the schematic diagram of dissolved hydrogen measuring instrument potential electrode structure;
Fig. 5 B is the schematic diagram of dissolved hydrogen measuring instrument structure.
Description of reference numerals:
1. sample introduction control module
11.A road water sample flow rate regulating valve
12.A temp probe
13.B road water sample flow rate regulating valve
14.B temp probe
15. measuring object cross-over valves
16.A road water discharging valve
17.B road water discharging valve
2. detecting unit
21. dissolved hydrogen measuring instruments
211. potential electrode
2111. electrode stem
2112. negative electrode
2113. electrode jacket
2114. positive electrode
2115. electrode film
2116. base
2117. plug
2118. mold pressing cap
2119. sealed screw
212. pole cup
2121. inlet
2122. liquid outlet
22. electronic flow-meters
3. sealing unit
4. data processing unit
5. cooling unit
51. coolant valves
52. heat exchangers
53.C temperature sensor
54. outlet valves
Embodiment
Metal erosion speed detection method embodiment
The present invention discloses a kind of metal erosion speed detection method, for detecting the metal erosion speed of thermal power generation system boiler heating surface pipeline.
The degree of depth of unit interval inner metal tube road corrosion, is commonly called as thinning, and unit is millimeter/year (mm/a) or receives m/h (nm/h).Reach certain peak value when thinning, show that this pipeline exists hidden danger, Boiler Operation should be adjusted immediately or shut down process, to avoid occurring accident, ensure the normal operation of thermal power generation system.In theory, there is following linear functional relation between corrosion speed and dissolved hydrogen content:
V＝(KQH
2/A)×10
-2
In formula: V-metal erosion speed (mm/a),
K-constant,
The evaporation capacity (t/h) of the tested boiler of Q-,
H
2the concentration (μ g/l) of hydrogen molecule in-sample introduction current,
A-heating surface area (m
2).
In above parameter, heating surface area is fixed value, can calculate, boiler capacity can be obtained by heat power engineering signal, remaining dissolved hydrogen content needs to measure, constant K is fixed value, span is 1.1 ~ 6.5, and preferred value is 1.8,2.1,2.6,2.9,3.2,3.8,4.1,4.6,5.2,5.9,6.2,6.4, can select according to the Acidity of Aikalinity of sample introduction current.
Fig. 1 is metal erosion speed detection method process flow diagram, and as shown in Figure 1, this detection method was included in the unit interval carries out following steps:
S1: the concentration detecting hydrogen molecule in sample introduction current;
S2: the evaporation capacity detecting tested boiler;
S3: determine the acid of sample introduction current, alkalescence;
S4: utilize formula V=(KQH
2/ A) × 10
-2, calculate the metal erosion speed of heating surface piping.
Wherein, the sequencing of S1, S2, S3 is unrestricted, can exchange arbitrarily or carry out simultaneously.
S1 comprises the steps:
S11: the content detecting hydrogen molecule in sample introduction current;
S12: the fluid volume detecting sample introduction current;
S13: the concentration calculating hydrogen molecule in sample introduction current.
Wherein, the order of S11, S12 can be exchanged or be carried out simultaneously.
Before the concentration measuring hydrogen molecule in sample introduction current, can also comprise the step S0 of detection control sample introduction water flow temperature within allowed band, S0 comprises:
S00: the temperature detecting sample introduction current;
S01: the sample introduction water flow temperature recorded and permissible value are compared, judges that whether sample introduction water flow temperature is lower than permissible value: when the temperature of sample introduction current is lower than permissible value, then carry out S1; When the temperature of sample introduction current is higher than permissible value, then look the needs of work on the spot, select to carry out S02 or S03;
S02: cool sample introduction current, until temperature is lower than permissible value, then carries out S1;
S03: report to the police, sample introduction current are directly discharged.
In S01, permissible value can be chosen in the scope between 20-40 DEG C, is preferably 25 DEG C.
The present invention is by the concentration of dissolved hydrogen molecule in dynamic monitoring sample introduction current, bonded boiler evaporation capacity, namely by calculate accurately obtain sample introduction current flow through the real-tirne metal corrosion speed of boiler heating surface pipeline, and then can judge whether this heating surface piping metal material lost efficacy, the need of maintain and replace, to the accident generation of prevention bolier tube failure and prolonged boiler service life of equipment, there is important positive effect.
Metal erosion speed detector embodiment
The present invention also discloses a kind of metal erosion speed detector, is arranged on the stopple coupon of tested boiler heating surface pipeline.Fig. 2 is the functional block diagram of metal erosion speed detector, and as shown in Figure 2, pick-up unit of the present invention comprises: sample introduction control module 1, detecting unit 2 and data processing unit 4.Detecting unit 2 comprises the dissolved hydrogen measuring instrument 21 and electronic flow-meter 22 that are cascaded.Dissolved hydrogen measuring instrument 21 is connected to sample introduction flow inlet, is used for detecting the content of dissolved hydrogen molecule in sample introduction current in the unit interval; Electronic flow-meter 22 is used for detecting the volume of sample introduction current in this unit interval.The data recorded are transferred to data processing unit 4 by detecting unit 2.Data processing unit 4 receives dissolved hydrogen measuring instrument 21 and the numerical value measured by electronic flow-meter 22, and based on these numerical evaluation go out sample introduction current flow through the metal erosion speed of the pipeline that is heated.The present invention utilizes formula V=(KQH
2/ A) × 10
-2calculate the metal erosion speed obtaining the pipeline that is heated that sample introduction current flow through, in formula,
V-metal erosion speed,
K-constant,
The evaporation capacity of the tested boiler of Q-,
H
2the concentration of hydrogen molecule in-sample introduction current,
A-heating surface area.
Certainly, dissolved hydrogen measuring instrument 21 and electronic flow-meter 22 position in a device can exchange, and namely electronic flow-meter 22 is connected to sample introduction flow inlet, also can complete the measurement of the concentration of hydrogen molecule in theory.
Fig. 3 is the structure diagram of metal erosion speed detector of the present invention.As shown in Figure 3, the entrance of dissolved hydrogen measuring instrument 21 connects the stopple coupon of boiler tubing to be measured, electronic flow-meter 22 is connected with dissolved hydrogen measuring instrument 21, and sample introduction current enter detecting unit by the stopple coupon of boiler tubing to be measured, flows out after flowing through dissolved hydrogen measuring instrument 21 and electronic flow-meter 22 successively.
Because in water sample to be measured, hydrogen easily precipitate in air, in order to ensure the concentration stabilize flowing through hydrogen molecule in the sample introduction current of dissolved hydrogen measuring instrument 21 better, then after electronic flow-meter 22, go back series seal unit 3, sealing unit can be a liquid packing, be used for water sample to be measured and atmospheric isolation to open, make the result that records more accurate.
Metal erosion speed detector of the present invention also can comprise sample introduction control module 1, controls two-way water sample A, B and enters pick-up unit in turn.Sample introduction control module 1 specifically comprises: A road water sample flow rate regulating valve 11, B road water sample flow rate regulating valve 13, measuring object cross-over valve 15.Measuring object cross-over valve 15 can be T-valve, and wherein one connect into detecting unit 2, another two-way communicates with the pipeline of A, B road water sample flow rate regulating valve respectively; A, B road water sample flow rate regulating valve 11,13 is connected with the stopple coupon of two boiler tubes in the heating surface of thermal power generation system respectively, is namely connected from different pipe under test respectively.
Sample introduction control module selectively controls two-way sample introduction current and enters pick-up unit in turn and detect.Certainly, those skilled in the art can on basis of the present invention, by the combination of pipeline and valve, can convert out three tunnels or more road sample intake passage.By arranging sample introduction control module, the utilization factor of metal erosion speed detector can be increased.
A road water sample flow rate regulating valve 11, B road water sample flow rate regulating valve 13, measuring object cross-over valve 15 can be manually-operated gate, also can be electrically operated valve, when for electric control valve, all be connected with data processing unit 4, open and close action is by the control of data processing unit 4, and data processing unit 4 has controlling functions concurrently.
Do not scorched by overheated steam to protect dissolved hydrogen measuring instrument and electronic flow-meter; and ensure testing carry out the accuracy with testing result smoothly; temperature sensor can be provided with before measuring object cross-over valve, detect the water temperature of sample introduction current whether within allowed band.As shown in Figure 4 A, A temp probe 12 and A road water discharging valve 16 are set between A road water sample flow rate regulating valve 11 and measuring object cross-over valve 15, B temp probe 14 and B road water discharging valve 17 are set between B road water sample flow rate regulating valve 13 and measuring object cross-over valve 15, A, B temp probe 12,14 can be temperature sensor, the temperature recorded is sent to data processing unit 4, data processing unit 4 will record temperature and permissible value compares, if record temperature lower than permissible value, then sample introduction current are allowed to enter detecting unit by measuring object cross-over valve; If record temperature higher than permissible value, then by sample introduction current discharger: a kind of discharge mode, for giving the alarm, is reminded operator to turn off A/B road water sample flow rate regulating valve, opened A/B road water discharging valve; Or directly control water sample flow rate regulating valve by DCU data control unit automatically to close, Bing Jiang A/B road water discharging valve is opened automatically.
Permissible value can be preset in data processing unit, as permissible value can be chosen in the scope between 20-40 DEG C, be preferably 25 DEG C.
When recording temperature higher than permissible value, also sample introduction current can be carried out cooling processing, after the temperature of sample introduction current is lower than permissible value, then introducing measuring unit.As described in Fig. 4 B, the present invention also comprises cooling unit 5, and cooling unit 5 is arranged on the porch of sample introduction control module 1, and as shown in Fig. 4 B dotted line frame, cooling unit 5 comprises coolant valve 51, heat exchanger 52, C temperature sensor 53 and outlet valve 54.Before coolant valve 51 is connected to water sample flow rate regulating valve, coolant valve 51, heat exchanger 52 and outlet valve 54 are connected successively, and C temperature sensor 53 is arranged in heat exchanger 52, before outlet valve 54 is connected to measuring object cross-over valve 15.
After closedown water sample flow rate regulating valve, open coolant valve 51, sample introduction current are introduced into heat exchanger 52 and cool, the C temperature sensor 53 in heat exchanger, measure the temperature of sample introduction current in real time, and the result recorded is sent to data processing unit 4.
Coolant valve 51 and outlet valve 54 can be both manual switch valve door, also can be automatic electrically operated valve.Treat that temperature that C temperature sensor records is lower than permissible value, then data processing unit 4 gives the alarm to operator, can open outlet valve 54, guides sample introduction current to enter detecting unit 2 and measures; Or automatically open under the control of data processing unit 4.
The pipeline of this cooling unit container used and sample introduction water stream contacts part all adopts stainless steel, ensures that the concentration of dissolved hydrogen in sample introduction current does not change.Based on same reason, the pipeline connected between A, B road water sample flow rate regulating valve 11 to detecting unit 2 adopts stainless steel pipes.Better, the pipeline connecting each unit in metal erosion speed detector all adopts stainless-steel tube.
When factor data processing unit calculates the corrosion speed of metallic conduit, the Acidity of Aikalinity using sample introduction current is needed to come the value of selectivity constant K and these two parameters of evaporation capacity of boiler to be measured, data processing unit can obtain the data of the evaporation capacity of boiler to be measured from other heat power engineering signal instrument and meters, and determines the Acidity of Aikalinity of sample introduction current according to the position of pipe under test or utilize pH value sensor to measure the potential of hydrogen of sample introduction current.Certainly, metal erosion speed detector of the present invention also can comprise the instrument of the evaporation capacity measuring boiler to be measured, or produces together as separable parts, use.In a word, as long as data processing unit is within the unit interval of measuring sample introduction current, the evaporation value of synchronous measurement boiler to be measured and the Acidity of Aikalinity of sample introduction current can be obtained, the metal erosion speed of pipeline can be calculated, and the approach of the Acidity of Aikalinity of the evaporation value and sample introduction current that obtain boiler to be measured is not limited.
Data processing unit can be a chip with data receiver, process and controlling functions, can be also an industrial computer, arrange display screen if desired; Better, can be a desktop computer.The numerical value such as metal erosion velocity amplitude and water sample flow, temperature can show on a display screen.
Fig. 5 A, Fig. 5 B are dissolved hydrogen measuring instrument structural representations, and as shown in Figure 5 B, dissolved hydrogen measuring instrument 21 of the present invention comprises potential electrode 211 and pole cup 212, and potential electrode is enclosed in wherein by pole cup.
Fig. 5 A indicates the structure of dissolved hydrogen measuring instrument potential electrode.Potential electrode 211 comprises electrode stem 2111; Be wrapped in the negative electrode 2112 on electrode stem 2111; Be enclosed in the electrode jacket 2113 outside electrode stem 2111, in it, be full of electrolytic solution; Positive electrode 2114 is positioned at the top of electrode stem 2111, and one end protrudes from electrode jacket 2113, and one end extend in electrode stem 2111; Cover the electrode film 2115 on the end face of positive electrode 2114, water sample to be measured and electrode interior kept apart, this electrode film be a kind of selectivity through film, only have the hydrogen molecule in water sample can through this film enter electrode interior participate in reaction.Electrode stem 2111 and electrode jacket 2113 can be fixed on base 2116; Plug 2117 is located at the opposite side of base, and negative electrode 2112, positive electrode 2114 are connected with plug 2117 respectively by wire, is drawn by the signal recorded.
In order to fastening electrode film 2115 better, mold pressing cap 2118 is set electrode film 2115 is pressed on positive electrode 2114, be fixed on electrode jacket 2113 simultaneously.The removable seals such as sealed screw 2119 can also be set on electrode jacket 2113, be used for supplementary electrolytic solution.Conveniently supplement the easy to operate of electrolytic solution, the setting position of sealed screw 2119 is preferably at the middle part of electrode jacket 2113 sidewall.
Positive electrode 2114 material is gold, and negative electrode 2112 material is silver, and electrolytic solution is saturated potassium chloride solution.
Pole cup 212 be a bottom with inlet 2121, top, with the cover body of liquid outlet 2122, is arranged on base 2116, and the potential electrode 211 shown in Fig. 5 B being turned upside down covers on wherein.
During work, potential electrode is loaded in pole cup, as shown in Figure 5A.The inlet that sample water flows through bottom enters pole cup, and discharge through top liquid outlet, water sample can be full of pole cup in the process.Hydrogen in water sample enters into electrolytic solution through electrode film, and sample introduction current are blocked in outside electrode jacket by electrode film.Hydrogen is reduced by working electrode in the electrolytic solution, produces dissufion current and is led to plug by the lead-in wire of anode and cathode, send to data processing unit further.
Implement many preferred embodiments of the present invention and preferred forms although below described in detail, be familiar with those skilled in the art in the invention and it is to be appreciated that enforcement various replaceable design and implementation example of the present invention all falls into the scope of appended claims.
Claims (10)
1. a metal erosion speed detection method, is characterized in that, this detection method was included in the unit interval carries out following steps:
S1: the concentration detecting hydrogen molecule in sample introduction current;
S2: the evaporation capacity detecting tested boiler;
S3: determine the acid of sample introduction current, alkalescence;
S4: utilize formula V=(KQH
2/ A) × 10
-2, calculate the metal erosion speed of heating surface area pipeline;
In formula, V-metal erosion speed,
K-constant,
The evaporation capacity of the tested boiler of Q-,
H
2the concentration of hydrogen molecule in-sample introduction current,
A-heating surface area;
Wherein, the sequencing of S1, S2, S3 can exchange or carry out simultaneously.
2. detection method as claimed in claim 1, it is characterized in that, S1 comprises the steps:
S11: the content detecting the hydrogen molecule in sample introduction current;
S12: the fluid volume detecting sample introduction current;
S13: the concentration calculating hydrogen molecule in sample introduction current;
Wherein, the sequencing of S11, S12 can exchange or carry out simultaneously.
3. detection method as claimed in claim 1, is characterized in that, before the concentration measuring the hydrogen molecule in sample introduction current, can also comprise detection, control the step S0 of sample introduction water flow temperature within allowed band, S0 comprises:
S00: the temperature detecting sample introduction current;
S01: the sample introduction water flow temperature recorded and permissible value are compared, judges that whether sample introduction water flow temperature is lower than permissible value: when the temperature of sample introduction current is lower than permissible value, then carry out S1; When the temperature of sample introduction current is higher than permissible value, then carry out S02 or S03;
S02: cool sample introduction current, until sample introduction water flow temperature is lower than permissible value, then carries out S1;
S03: report to the police, sample introduction current are directly discharged.
4. a metal erosion speed detector, is characterized in that, comprises detecting unit and data processing unit:
Described detecting unit comprises:
Dissolved hydrogen measuring instrument, is connected to sample introduction flow inlet place, and it detects the content of dissolved hydrogen molecule in sample introduction current in unit interval, by the data transfer that records to described data processing unit;
Electronic flow-meter, together with dissolved hydrogen measuring instrument placed in series, it detects the volume of sample introduction current in this unit interval, gives described data processing unit by the data transfer that records;
Described data processing unit receives described dissolved hydrogen measuring instrument and the numerical value measured by electronic flow-meter, and based on described numerical evaluation go out described sample introduction current flow through the metal erosion speed of the pipeline that is heated.
5. metal erosion speed detector as claimed in claim 4, is characterized in that, described data processing unit formula V=(KQH
2/ A) × 10
-2calculate the metal erosion speed of the pipeline that is heated that sample introduction current flow through, wherein,
V-metal erosion speed,
K-constant,
The evaporation capacity of the tested boiler of Q-,
H
2the concentration of hydrogen molecule in-sample introduction current,
A-heating surface area.
6. metal erosion speed detector as claimed in claim 4, it is characterized in that, also comprise sealing unit, it is connected with described electronic flow-meter by pipeline, and sample introduction current flow through described dissolved hydrogen measuring instrument, electronic flow-meter and sealing unit successively.
7. metal erosion speed detector as claimed in claim 4, it is characterized in that, also comprise sample introduction control module, control A, B road water sample enters pick-up unit in turn; Described sample introduction control module comprises:
A road water sample flow rate regulating valve, is connected with the heating surface A road boiler tube of thermal power generation system;
B road water sample flow rate regulating valve, is connected with the heating surface B road boiler tube of thermal power generation system;
Measuring object cross-over valve, communicates with described detecting unit and described A, B road water sample flow rate regulating valve respectively.
8. metal erosion speed detector as claimed in claim 7, is characterized in that, between described A road water sample flow rate regulating valve and described measuring object cross-over valve, arrange A temperature sensor; Between described B road water sample flow rate regulating valve and described measuring object cross-over valve, arrange B temperature sensor, the temperature recorded is sent to described data processing unit by described A, B temperature sensor.
9. metal erosion speed detector as claimed in claim 8, is characterized in that, also comprise cooling unit, comprise coolant valve, heat exchanger and the outlet valve of connecting successively; Before coolant valve is connected to water sample flow rate regulating valve, before outlet valve is connected to measuring object cross-over valve; C temperature sensor is provided with in described heat exchanger; The temperature recorded is sent to described data processing unit by described C temperature sensor.
10. the metal erosion speed detector as described in as arbitrary in claim 4 to 9, it is characterized in that, described dissolved hydrogen measuring instrument comprises potential electrode and pole cup, and described pole cup bottom is with inlet, and potential electrode, with liquid outlet, is surrounded by top; Described potential electrode comprises:
Electrode stem;
Negative electrode, is wrapped on described electrode stem;
Electrode jacket, is enclosed in outside described negative electrode and described electrode stem, is full of electrolytic solution in this electrode jacket;
Positive electrode, be fixed on described electrode stem head, one end protrudes from electrode jacket, and one end extend in electrode stem;
Electrode film, covers the position described positive electrode being fixed on described electrode jacket wall;
Wherein, the signal recorded is drawn by wire by described negative electrode and described positive electrode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548229A (en) * | 2015-12-08 | 2016-05-04 | 国网山东省电力公司电力科学研究院 | Detection method for assessment of corrosion state of tower zinc coating surface |
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| CN113916761B (en) * | 2021-10-09 | 2024-04-02 | 北京中冶设备研究设计总院有限公司 | Automatic corrosive liquid discharging device |
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