CN104634723B - Metal erosion speed detection method and detection device - Google Patents
Metal erosion speed detection method and detection device Download PDFInfo
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- CN104634723B CN104634723B CN201510012764.7A CN201510012764A CN104634723B CN 104634723 B CN104634723 B CN 104634723B CN 201510012764 A CN201510012764 A CN 201510012764A CN 104634723 B CN104634723 B CN 104634723B
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Abstract
The present invention discloses a kind of metal erosion speed detection method and detection device, the metal erosion speed detector include：Detection unit and data processing unit；Detection unit is connected at sample introduction flow inlet, and detection unit includes the dissolved hydrogen measuring instrument and electronic flowmeter with placed in series together；Dissolved hydrogen measuring instrument is used for detecting the content for dissolving hydrogen molecule in the unit interval in sample introduction flow；Electronic flowmeter is used for detecting the volume of sample introduction flow in the unit interval；Detection unit is by the bulk transport of the content of the dissolving hydrogen molecule measured in the unit interval and sample introduction flow to data processing unit；The data processing unit receives the numerical value measured by the dissolved hydrogen measuring instrument and electronic flowmeter, and goes out the metal erosion speed that the sample introduction flow flows through heated pipeline based on the numerical computations.The present invention can dynamic on-line monitoring thermal power generation system boiler heating surface pipeline metal erosion speed, prevent bolier tube failure accident occur.
Description
Technical field
The present invention relates to a kind of metal erosion speed detection method and detection devices, by detecting dissolved hydrogen in pipeline water flow
Concentration calculate heated pipeline metal erosion speed, be used for the on-line monitoring of Thermal Equipments of Thermal Power Plants.
Background technology
Generating set is run in heating power production process since boiler tube is chronically under high temperature, high pressure, along with electric at present
Frequently start during net peak regulation, stop transport and spare reality, makes in heat power equipment (especially water-cooling wall and superheater)
Metal material be chronically among thermal stress and mechanical stress, easily corrode.Corrosion is the most straight of heat power equipment damage
Reason is connect, the threat constituted to power plant safety economy, steady production is extremely serious.
Reinforce research thus and solve the On-Line Dynamic Monitoring of heating surface furnace tube material corrosion rate in process of production,
It to make specific aim safeguard measure to boiler tube in time, prevents heating surface metal material from failing, prevents bolier tube failure accident and occur,
Prolonged boiler service life of equipment just becomes the significant technology issues that cannot currently avoid and must research and solve as early as possible.
Invention content
The present invention discloses a kind of metal erosion speed detection method and detection device, is applied in thermal power generation system, leads to
Cross the concentration for measuring the hydrogen molecule in heating surface boiler tube in steam sample introduction flow, bonded boiler evaporation capacity and steam sample introduction flow
Acid-base property, the corrosion rate of metal material can be calculated.
The present invention is implemented by following technical proposal：
The present invention discloses a kind of metal erosion speed detection method, the detection method include carried out within the unit interval it is as follows
Step：
S1：Detect the concentration of hydrogen molecule in sample introduction flow；
S2：Detection is tested the evaporation capacity of boiler；
S3：Determine acid, the alkalinity of sample introduction flow；
S4：Utilize formula V=(KQH2/A)×10-2, the metal erosion speed of heating surface piping is calculated；
In formula, V- metal erosion speed (mm/a)；
K- constants；
Q- is tested the evaporation capacity (t/h) of boiler；
H2The concentration (μ g/l) of hydrogen molecule in sample introduction flow；
A- heating surface areas (m2)；
Wherein, the sequencing of S1, S2, S3 can be interchanged or is carried out at the same time.
S1 includes the following steps：
S11：Detect the content of the hydrogen molecule in sample introduction flow；
S12：Detect the fluid volume of sample introduction flow；
S13：The concentration of hydrogen molecule in sample introduction flow is calculated；
Wherein, the sequence of S11, S12 can be interchanged or is carried out at the same time.
Before the concentration of the hydrogen molecule in measuring sample introduction flow, it can also exist including detection, control sample introduction water flow temperature
Step S0, S0 within allowable range include：
S00：Detect the temperature of sample introduction flow；
S01：The sample introduction water flow temperature measured is compared with permissible value, judges sample introduction water flow temperature whether less than permission
Value：When sample introduction flow temperature be less than permissible value, then carry out S1；When sample introduction flow temperature be higher than permissible value, then according to scene
Need of work may be selected to carry out S02 or S03；
S02：Sample introduction flow is cooled down, until temperature is less than permissible value, then carries out S1；
S03：Alarm, by sample introduction flow direct emission.
Invention additionally discloses a kind of metal erosion speed detectors, including：Detection unit and data processing unit, detection
Unit includes：Dissolved hydrogen measuring instrument is connected to sample introduction flow inlet, detects in the unit interval and dissolves hydrogen molecule in sample introduction flow
Content, by the data transfer measured to data processing unit, electronic flowmeter, with dissolved hydrogen measuring instrument placed in series one
It rises, the volume of sample introduction flow in the unit interval is detected, by the data transfer measured to data processing unit；At the data
Reason unit receives the numerical value measured by the dissolved hydrogen measuring instrument and electronic flowmeter, and based on the numerical computations go out described in into
Sample flow flows through the metal erosion speed of heated pipeline.
Data processing unit formula V=(KQH2/A)×10-2The heat pipe that sample introduction flow is flowed through is calculated
The metal erosion speed in road, wherein
V- metal erosion speed,
K- constants,
Q- is tested the evaporation capacity of boiler,
H2The concentration of hydrogen molecule in sample introduction flow,
A- heating surface areas.
In the present invention, it because hydrogen molecule is extremely unstable in water sample, is easy that loss is precipitated, in order to which the result measured is more accurate
Really, dissolved hydrogen measuring instrument is connected to the entrance of sample introduction flow by pipeline.
Because boiler tubing to be measured sampling pipe be capstan, in order to better ensure that flow through dissolved hydrogen measuring instrument into
The concentration of hydrogen molecule is stablized in sample flow, then goes back series seal unit after electronic flowmeter, sealing unit i.e. by pipeline with
The electronic flowmeter series connection, sample introduction flow is followed by the dissolved hydrogen measuring instrument, electronic flowmeter and sealing unit.
Metal erosion speed detector of the present invention may also include sample introduction control unit, control A, B two-way water sample in turn into
Enter detection device.Control unit specifically includes：The roads A water sample flow rate regulating valve, with the roads the heating surface A boiler tube of thermal power generation system
Sampling line is connected；The roads B water sample flow rate regulating valve is connected with the sampling line of the roads the heating surface B boiler tube of thermal power generation system；It surveys
Amount object switching valve is communicated with the detection unit and the road A, B water sample flow rate regulating valve respectively.
A temperature sensors are provided between the roads A water sample flow rate regulating valve and measurement object switching valve, in the roads B aqueous sample stream
B temperature sensors are provided between amount adjustment valve and measurement object switching valve, the temperature measured is sent to by A, B temperature sensor
Data processing unit.
Metal erosion speed detector of the present invention can also further comprise cooling unit, be mounted on sample introduction control unit
Inlet, including the coolant valve, heat exchanger and the outlet valve that are sequentially connected in series；Coolant valve is connected to water sample flow rate regulating valve
Before, outlet valve connects measurement object switching valve；C temperature sensors are provided in the heat exchanger.
The result measured is sent to data processing unit, coolant valve and outlet valve by data by C temperature sensors
Manage the control of unit.
Above-mentioned all pipelines all use stainless steel pipes.
Metal erosion speed detector of the present invention can also further comprise the steam flow for measuring boiler capacity to be measured
The result of measurement is sent to by the heat power engineering signals such as tester instrument and pH value sensor, steam flow tester and pH value sensor
Data processing unit.
Data processing unit has display screen, for showing measurement result.
Above-mentioned dissolved hydrogen measuring instrument includes measuring electrode and pole cup, and pole cup lower part carries inlet, and top carries out
Liquid mouth, measuring electrode is surrounded；The measuring electrode includes：Electrode stem；The negative electrode being wrapped on electrode stem；Electrode jacket,
It is enclosed in outside the negative electrode and electrode stem, electrolyte is full of in electrode jacket；Positive electrode is fixed on electrode club head, one end
Electrode jacket is protruded from, one end is extend into electrode stem；Electrode film is covered in the position that electrode jacket wall is fixed on positive electrode
It sets；Wherein, the negative electrode and the positive electrode are drawn the signal measured by conducting wire.
Metal erosion speed detector of the present invention further includes molding cap, and the molding cap is fixed on the electrode jacket
On, by the electrode film compacting.
It is additionally provided with removable seal on above-mentioned electrode jacket wall, for supplementing electrolyte.
Alternatively, metal erosion speed detector still further comprises pH value sensor and measures boiler capacity to be measured
The result of measurement is sent to data processing unit by steam flow tester, the 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 to work,
Hydrogen meltage in dynamic monitoring heating surface boiler tube in water, to calculate the real-time corrosion speed of metal tube, detection method letter
It is single, easy to operate so that operating personnel can make specific aim safeguard measure to boiler tube in time, prevent heating surface metal material from losing
Effect is prevented bolier tube failure accident and is occurred, prolonged boiler service life of equipment.
The present invention measures the metal erosion speed of heating surface boiler tube, has important positive effect to thermal power generation system：
(1) passive state and its effect of boiler heating surface metal material be can determine that.It is especially sour after boiler startup
Start for the first time after washing, whether heating surface metal material has quickly formed natural oxide film and be transferred to passive state, through the invention
In dissolved hydrogen analyze data, those skilled in the art it is determined that with evaluation boiler tube permanent passivating film establish reality
Situation；
(2) optimize and screen anticorrosion treatment technology technology in different pots, can determine that the reality of anticorrosion process different from evaluation
Border effect.Above-mentioned evaluation and screening are carried out using the present invention, it is more more square than using the methods of iron-holder in sample introduction flow is measured
Just, intuitive and reliable；
(3) it is the reason of live furnace tube material of analysis and research corrodes, property and boiler tube condition in damaged, provides and reliably go through
Foundation of the history measurement data as analysis judgement plays the role of prevention bolier tube failure accident vital.
Description of the drawings
Fig. 1 is metal erosion speed detection method flow chart 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 are the sample introduction control unit schematic diagram with temperature sensor；
Fig. 4 B are cooling unit and sample introduction control unit schematic diagram；
Fig. 5 A are the schematic diagrames of dissolved hydrogen measuring instrument measuring electrode structure；
Fig. 5 B are the schematic diagrames of dissolved hydrogen measuring instrument structure.
Reference sign：
1. sample introduction control unit
The roads 11.A water sample flow rate regulating valve
12.A temp probes
The roads 13.B water sample flow rate regulating valve
14.B temp probes
15. measurement object switching valve
The roads 16.A water discharging valve
The roads 17.B water discharging valve
2. detection unit
21. dissolved hydrogen measuring instrument
211. measuring electrode
2111. electrode stem
2112. negative electrode
2113. electrode jacket
2114. positive electrode
2115. electrode film
2116. pedestal
2117. plug
2118. being molded cap
2119. sealed screw
212. pole cup
2121. inlet
2122. liquid outlet
22. electronic flowmeter
3. sealing unit
4. data processing unit
5. cooling unit
51. coolant valve
52. heat exchanger
53.C temperature sensors
54. outlet valve
Specific implementation mode
Metal erosion speed detection method embodiment
The present invention discloses a kind of metal erosion speed detection method, for detecting thermal power generation system boiler heating surface pipeline
Metal erosion speed.
The depth of unit interval inner metal tube road corrosion, is commonly called as being thinned, and unit is millimeter/year (mm/a) or nanometer/small
When (nm/h).Reach certain peak value when being thinned, showing the pipeline, there are hidden danger, should adjust Boiler Operation or dock immediately
Reason, to avoid there is accident, ensures the normal operation of thermal power generation system.Theoretically, between corrosion rate and dissolving hydrogen content
There are linear functional relations below：
V=(KQH2/A)×10-2
In formula：V- metal erosion speed (mm/a),
K- constants,
Q- is tested the evaporation capacity (t/h) of boiler,
H2The concentration (μ g/l) of hydrogen molecule in sample introduction flow,
A- heating surface areas (m2)。
Heating surface area is fixed value in the above parameter, can be calculated, boiler capacity can be obtained by heat power engineering signal
Take, remaining dissolving hydrogen content needs to measure, constant K be fixed value, value range be 1.1~6.5, preferred value 1.8,2.1,
2.6,2.9,3.2,3.8,4.1,4.6,5.2,5.9,6.2,6.4, it can be selected according to the acid-base property of sample introduction flow.
Fig. 1 is metal erosion speed detection method flow chart, as shown in Figure 1, the detection method includes within the unit interval
Carry out following steps：
S1：Detect the concentration of hydrogen molecule in sample introduction flow；
S2：Detection is tested the evaporation capacity of boiler；
S3：Determine acid, the alkalinity of sample introduction flow；
S4：Utilize formula V=(KQH2/A)×10-2, the metal erosion speed of heating surface piping is calculated.
Wherein, the sequencing of S1, S2, S3 are unrestricted, arbitrarily can exchange or be carried out at the same time.
S1 includes the following steps：
S11：Detect the content of hydrogen molecule in sample introduction flow；
S12：Detect the fluid volume of sample introduction flow；
S13：The concentration of hydrogen molecule in sample introduction flow is calculated.
Wherein, the sequence of S11, S12 can be interchanged or is carried out at the same time.
In measuring sample introduction flow before the concentration of hydrogen molecule, can also include detection control sample introduction water flow temperature allowing
Within the scope of step S0, S0 include：
S00：Detect the temperature of sample introduction flow；
S01：The sample introduction water flow temperature measured is compared with permissible value, judges sample introduction water flow temperature whether less than permission
Value：When sample introduction flow temperature be less than permissible value, then carry out S1；When the temperature of sample introduction flow is higher than permissible value, then live work is regarded
The needs of work, selection carry out S02 or S03；
S02：Sample introduction flow is cooled down, until temperature is less than permissible value, then carries out S1；
S03：Alarm, by sample introduction flow direct emission.
In S01, permissible value can be chosen in the range of between 20-40 DEG C, preferably 25 DEG C.
The present invention passes through the concentration of dissolving hydrogen molecule in dynamic monitoring sample introduction flow, bonded boiler evaporation capacity, you can pass through
The real-tirne metal corrosion rate for being accurately obtained the flowed through boiler heating surface pipeline of sample introduction flow is calculated, and then can determine whether out that this is heated
Whether facial canal road metal material fails, if need repairing replacement, to preventing the generation of bolier tube failure accident and prolonged boiler equipment
Service life has important positive effect.
Metal erosion speed detector embodiment
Invention additionally discloses a kind of metal erosion speed detectors, are mounted on the probe tube of tested boiler heating surface pipeline
On.Fig. 2 is the functional block diagram of metal erosion speed detector, as shown in Fig. 2, detection device of the present invention includes：Sample introduction controls
Unit 1, detection unit 2 and data processing unit 4.Detection unit 2 includes the dissolved hydrogen measuring instrument 21 and electronics being cascaded
Flowmeter 22.Dissolved hydrogen measuring instrument 21 is connected to sample introduction flow inlet, for detecting in the unit interval dissolved hydrogen in sample introduction flow
The content of molecule；Electronic flowmeter 22 is used for detecting the volume of sample introduction flow in the unit interval.The number that detection unit 2 will measure
According to being transferred to data processing unit 4.Data processing unit 4 receives the number measured by dissolved hydrogen measuring instrument 21 and electronic flowmeter 22
Value, and go out the metal erosion speed that sample introduction flow flows through heated pipeline based on these numerical computations.The present invention utilizes formula V=
(KQH2/A)×10-2It calculates and obtains the metal erosion speed for the heated pipeline that sample introduction flow is flowed through, in formula,
V- metal erosion speed,
K- constants,
Q- is tested the evaporation capacity of boiler,
H2The concentration of hydrogen molecule in sample introduction flow,
A- heating surface areas.
Certainly, the position of dissolved hydrogen measuring instrument 21 and electronic flowmeter 22 in a device can be interchanged, that is, electron stream
Gauge 22 is connected to sample introduction flow inlet, theoretically can also complete the measurement of the concentration of hydrogen molecule.
Fig. 3 is the structure diagram of metal erosion speed detector of the present invention.As shown in figure 3, dissolved hydrogen measuring instrument 21
Entrance connects the probe tube of boiler tubing to be measured, and electronic flowmeter 22 is connected with dissolved hydrogen measuring instrument 21, and sample introduction flow is by be measured
The probe tube of boiler tubing enters detection unit, followed by being flowed out after dissolved hydrogen measuring instrument 21 and electronic flowmeter 22.
Because hydrogen is easy to precipitate into air in water sample to be measured, in order to better ensure that flow through dissolved hydrogen measuring instrument 21 into
The concentration of hydrogen molecule is stablized in sample flow, then series seal unit 3 is gone back after electronic flowmeter 22, which can be one
Liquid packing, for opening water sample to be measured with atmospheric isolation so that the result measured is more acurrate.
Metal erosion speed detector of the present invention may also include sample introduction control unit 1, and control two-way water sample A, B wheel flows into
Enter detection device.Sample introduction control unit 1 specifically includes：The roads A water sample flow rate regulating valve 11, measures the roads B water sample flow rate regulating valve 13
Object switching valve 15.Measurement object switching valve 15 can be triple valve, wherein one connects into detection unit 2, another two-way respectively with A, B
The pipeline of road water sample flow rate regulating valve communicates；A, the roads B water sample flow rate regulating valve 11,13 respectively with the heating surface of thermal power generation system
In two boiler tubes probe tube be connected, i.e., respectively from different pipe under test be connected.
Sample introduction control unit selectively controls two-way sample introduction flow and is detected in turn into detection device.Certainly, originally
Field technology personnel can on the basis of the present invention, can by the combination of pipeline and valve, become swap out three tunnels or more road into
Sample channel.By the way that sample introduction control unit is arranged, the utilization rate of metal erosion speed detector can be increased.
The roads A water sample flow rate regulating valve 11, the roads B water sample flow rate regulating valve 13, measurement object switching valve 15 can be manually-operated gate,
It is alternatively electrically operated valve, when for electric control valve, is all connected with data processing unit 4, open and close are acted by data processing unit 4
Control, data processing unit 4 has control function concurrently.
In order to which the steam for protecting dissolved hydrogen measuring instrument and electronic flowmeter not to be overheated scorches, and ensure detection work
It is smoothed out the accuracy with testing result, temperature sensor can be provided with before measurement object switching valve, to detect sample introduction
Whether the water temperature of flow is within allowable range.As shown in Figure 4 A, in the roads A water sample flow rate regulating valve 11 and measurement object switching valve
A temp probes 12 and the roads A water discharging valve 16, water sample flow rate regulating valve 13 and measurement object switching valve 15 on the roads B are set between 15
Between setting B temp probes 14 and the roads B water discharging valve 17, A, B temp probe 12,14 can be temperature sensor, the temperature that will be measured
Degree is sent to data processing unit 4, and measured temperature is compared by data processing unit 4 with permissible value, if measured temperature is less than
Permissible value then allows sample introduction flow to enter detection unit by measurement object switching valve；It, will if measured temperature is higher than permissible value
Sample introduction flow discharger：A kind of discharge mode is to send out alarm, reminds operator to turn off the roads A/B water sample flow rate regulating valve, beats
Open the roads A/B water discharging valve；Or water sample flow rate regulating valve is directly controlled by DCU data control unit and is automatically closed, the roads Bing Jiang A/B row
Penstock automatically opens.
Permissible value can be preset in data processing unit, it is excellent if permissible value can be chosen in the range of between 20-40 DEG C
It is selected as 25 DEG C.
When measured temperature be higher than permissible value, can also by sample introduction flow carry out cooling treatment, wait for that the temperature of sample introduction flow is less than
After permissible value, it is re-introduced into measuring unit.As described in Fig. 4 B, the invention also includes cooling unit 5, cooling unit 5 is mounted on sample introduction
The inlet of control unit 1, as shown in Fig. 4 B dotted line frames, cooling unit 5 includes 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 51,52 and of heat exchanger
Outlet valve 54 is sequentially connected in series, and C temperature sensors 53 are arranged in heat exchanger 52, and outlet valve 54 is connected to measurement object and turns
Before changing valve 15.
After closing water sample flow rate regulating valve, open coolant valve 51, sample introduction flow be introduced into heat exchanger 52 carry out it is cold
But, the C temperature sensors 53 in heat exchanger, measure the temperature of sample introduction flow in real time, and the result measured is sent to number
According to processing unit 4.
Coolant valve 51 and outlet valve 54 both can be manual switch valve door or automatic electrically operated valve.Wait for C temperature
The temperature that degree sensor measures is less than permissible value, then data processing unit 4 sends out alarm to operator, can open outlet valve
54, guiding sample introduction flow enters detection unit 2 and measures；Or it is automatically opened under the control of data processing unit 4.
Container used in the cooling unit and the pipeline of sample introduction flow contact portion are all made of stainless steel, to ensure sample introduction
The concentration of dissolved hydrogen does not change in flow.For the same reason, the roads connection A, B water sample flow rate regulating valve 11 arrive detection unit 2
Between pipeline use stainless steel pipes.Preferably, the pipeline that each unit is connected in metal erosion speed detector is all made of
Stainless steel tube.
When calculating the corrosion rate of metallic conduit because of data processing unit, need to use the acid-base property of sample introduction flow to select
The two parameters of the evaporation capacity of the value of constant K and boiler to be measured, data processing unit can be from other heat power engineering signal instrument instrument
Table obtains the data of the evaporation capacity of boiler to be measured, and acid-base property or the utilization of sample introduction flow are determined according to the position of pipe under test
PH value sensor measures the acid-base value of sample introduction flow.Certainly, metal erosion speed detector of the present invention can also include surveying
The instrument of the evaporation capacity of boiler to be measured is measured, or produces, use together as separable component.As long as in short, data processing
Unit can obtain the evaporation magnitude and sample introduction flow of synchronous measurement boiler to be measured within the unit interval for measuring sample introduction flow
Acid-base property, you can the metal erosion speed of pipeline is calculated, and for obtaining the evaporation magnitude and sample introduction water of boiler to be measured
The approach of the acid-base property of stream is not intended to limit.
Data processing unit can be a chip with data receiver, processing and control function, or a work
Control machine, when necessary setting show screen；Preferably, it can be a desktop computer.Metal erosion velocity amplitude and water sample flow, temperature
Equal numerical value can be shown on a display screen.
Fig. 5 A, Fig. 5 B are dissolved hydrogen measuring instrument structural schematic diagrams, as shown in Figure 5 B, dissolved hydrogen measuring instrument 21 of the invention packet
Measuring electrode 211 and pole cup 212 are included, pole cup surrounds measuring electrode wherein.
Fig. 5 A indicate the structure of dissolved hydrogen measuring instrument measuring electrode.Measuring electrode 211 includes electrode stem 2111；Winding
Negative electrode 2112 on electrode stem 2111；The electrode jacket 2113 being enclosed in outside electrode stem 2111, it is interior to be full of electrolyte；Sun
Electrode 2114 is located at the top of electrode stem 2111, and one end protrudes from electrode jacket 2113, and one end is extend into electrode stem 2111；It covers
The electrode film 2115 on the end face of positive electrode 2114 is covered, water sample to be measured is kept apart with electrode interior, which is a kind of
Selectivity penetrates film, and the only hydrogen molecule in water sample can enter electrode interior through the film and participate in reacting.Electrode stem 2111 with
Electrode jacket 2113 can be fixed on pedestal 2116；Plug 2117 is located at the other side of pedestal, negative electrode 2112, positive electrode 2114
It is connected respectively with plug 2117 by conducting wire, the signal measured is drawn.
In order to which preferably electrode film 2115 is pressed on positive electrode 2114 by fastening electrode film 2115, setting molding cap 2118
On, it is also secured on electrode jacket 2113.The removable sealings such as sealed screw 2119 can also be set on electrode jacket 2113
Mouthful, for supplementing electrolyte.In order to facilitate the easy to operate of supplement electrolyte, the installation position of sealed screw 2119 is preferably in electricity
The middle part of 2113 side wall of pole housing.
2114 material of positive electrode is gold, and 2112 material of negative electrode is silver, and electrolyte is saturated potassium chloride solution.
Pole cup 212 is that a lower part carries inlet 2121, and top carries the cover body of liquid outlet 2122, is mounted on pedestal
On 2116, measuring electrode 211 shown in Fig. 5 B is turned upside down and is covered on wherein.
When work, measuring electrode is loaded in pole cup, as shown in Figure 5A.The inlet that sample water flows through lower part enters electricity
Pole cup, is discharged, water sample can be full of pole cup in the process through top liquid outlet.Hydrogen in water sample is entered through electrode film
In electrolyte, and sample introduction flow is blocked in by electrode film outside electrode jacket.Hydrogen is restored by working electrode in the electrolytic solution, is generated
Dissufion current leads to plug by the lead of anode and cathode, is further transmitted to data processing unit.
It is ripe although many preferred embodiments and preferred forms for implementing the present invention are described in detail above
It knows those skilled in the art in the invention and should be aware that implementing the various of the present invention replaceable design and implement example and both fall within
The scope of the appended claims.
Claims (9)
1. a kind of metal erosion speed detection method, which is characterized in that the detection method include within the unit interval carry out it is as follows
Step：
S1：Detect the concentration of hydrogen molecule in sample introduction flow, including step：
S11：Dissolved hydrogen measuring instrument is connected at sample introduction flow inlet, detects in the unit interval and dissolves hydrogen molecule in sample introduction flow
Content, by the data transfer measured to data processing unit；
S12：By electronic flowmeter and the dissolved hydrogen measuring instrument placed in series, the body of sample introduction flow in the unit interval is detected
Product gives the data transfer measured to the data processing unit；
S13：The concentration of hydrogen molecule in sample introduction flow is calculated in the data processing unit；
Wherein, the sequencing of S11, S12 can be interchanged or is carried out at the same time；
S2：Detection is tested the evaporation capacity of boiler；
S3：Determine acid, the alkalinity of sample introduction flow；
S4：Utilize formula V=(KQH2/A)×10-2, the metal erosion speed of heating surface area pipeline is calculated；
In formula, V- metal erosion speed,
K- constants,
Q- is tested the evaporation capacity of boiler,
H2The concentration of hydrogen molecule in sample introduction flow,
A- heating surface areas；
Wherein, the sequencing of S1, S2, S3 can be interchanged or is carried out at the same time；
The dissolved hydrogen measuring instrument includes measuring electrode and pole cup, and the pole cup lower part carries inlet, and top carries out
Liquid mouth, measuring electrode is surrounded；The measuring electrode includes：
Electrode stem；
Negative electrode is wrapped on the electrode stem；
Electrode jacket is enclosed in outside the negative electrode and the electrode stem, and electrolyte is full of in the electrode jacket；
Positive electrode is fixed on the electrode club head, and one end protrudes from electrode jacket, and one end is extend into electrode stem；
Electrode film is covered in the position that the electrode jacket wall is fixed on the positive electrode；
Wherein, the negative electrode and the positive electrode are drawn the signal measured by conducting wire.
2. detection method as described in claim 1, which is characterized in that the concentration of the hydrogen molecule in measuring sample introduction flow it
Before, can also include that the step S0, S0 of detection, control sample introduction water flow temperature within allowable range include：
S00：Detect the temperature of sample introduction flow；
S01：The sample introduction water flow temperature measured is compared with permissible value, judges whether sample introduction water flow temperature is less than permissible value：
When sample introduction flow temperature be less than permissible value, then carry out S1；When sample introduction flow temperature be higher than permissible value, then carry out S02 or
S03；
S02：Sample introduction flow is cooled down, until sample introduction water flow temperature is less than permissible value, then carries out S1；
S03：Alarm, by sample introduction flow direct emission.
3. a kind of metal erosion speed detector, which is characterized in that including detection unit, sealing unit and data processing list
Member：
The detection unit includes：
Dissolved hydrogen measuring instrument is connected at sample introduction flow inlet, is detected and is dissolved hydrogen molecule in the unit interval in sample introduction flow
Content gives the data transfer measured to the data processing unit；
Electronic flowmeter detects the body of sample introduction flow in the unit interval together with dissolved hydrogen measuring instrument placed in series
Product gives the data transfer measured to the data processing unit；
The sealing unit is connected by pipeline with the electronic flowmeter, and sample introduction flow measures followed by the dissolved hydrogen
Instrument, electronic flowmeter and sealing unit；
The data processing unit receives the numerical value measured by the dissolved hydrogen measuring instrument and electronic flowmeter, and is based on the number
Value calculates the metal erosion speed that the sample introduction flow flows through heated pipeline；
Wherein, the dissolved hydrogen measuring instrument includes measuring electrode and pole cup, and the pole cup lower part carries inlet, top band
There is liquid outlet, measuring electrode is surrounded；The measuring electrode includes：
Electrode stem；
Negative electrode is wrapped on the electrode stem；
Electrode jacket is enclosed in outside the negative electrode and the electrode stem, and electrolyte is full of in the electrode jacket；
Positive electrode is fixed on the electrode club head, and one end protrudes from electrode jacket, and one end is extend into electrode stem；
Electrode film is covered in the position that the electrode jacket wall is fixed on the positive electrode；
Wherein, the negative electrode and the positive electrode are drawn the signal measured by conducting wire；
Data processing unit formula V=(KQH2/A)×10-2The heated pipeline that sample introduction flow is flowed through is calculated
Metal erosion speed, wherein
V- metal erosion speed,
K- constants,
Q- is tested the evaporation capacity of boiler,
H2The concentration of hydrogen molecule in sample introduction flow,
A- heating surface areas.
4. metal erosion speed detector as claimed in claim 3, which is characterized in that further include sample introduction control unit, control
The road A, B processed water sample enters detection unit in turn；The sample introduction control unit includes：
The roads A water sample flow rate regulating valve is connected with the roads the heating surface A boiler tube of thermal power generation system；
The roads B water sample flow rate regulating valve is connected with the roads the heating surface B boiler tube of thermal power generation system；
Measurement object switching valve is communicated with the detection unit and the road A, B water sample flow rate regulating valve respectively.
5. metal erosion speed detector as claimed in claim 4, which is characterized in that adjusted in the roads the A water sample flow
A temperature sensors are set between valve and the measurement object switching valve；In the roads the B water sample flow rate regulating valve and the measurement pair
As B temperature sensors are arranged between switching valve, the temperature measured is sent to the data processing list by A, B temperature sensor
Member.
6. metal erosion speed detector as claimed in claim 5, which is characterized in that further include cooling unit, including according to
Secondary concatenated coolant valve, heat exchanger and outlet valve；Before coolant valve is connected to water sample flow rate regulating valve, outlet valve connects
Before being connected on measurement object switching valve；C temperature sensors are provided in the heat exchanger；The C temperature sensors will measure
Temperature is sent to the data processing unit.
7. metal erosion speed detector as claimed in claim 3, which is characterized in that further include molding cap, the molding
Cap is fixed on the electrode jacket, by the electrode film compacting.
8. metal erosion speed detector as claimed in claim 3, which is characterized in that also set on above-mentioned electrode jacket wall
It is equipped with removable seal, for supplementing electrolyte.
9. metal erosion speed detector as claimed in claim 7, which is characterized in that further include pH value sensor and measurement
The steam flow tester of boiler capacity to be measured, the pH value sensor and steam flow tester send the result of measurement
To data processing unit.
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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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