CN115683767A - Method and device for evaluating high-temperature dispersion performance of dispersing agent for nuclear power station - Google Patents
Method and device for evaluating high-temperature dispersion performance of dispersing agent for nuclear power station Download PDFInfo
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Abstract
The invention relates to the field of deposit management, in particular to a method and a device for evaluating high-temperature dispersion performance of a dispersing agent for a nuclear power station. The automatic temperature measuring device comprises a kettle body, wherein the kettle body comprises a heating furnace, the upper part of the heating furnace is covered with a kettle cover, the kettle cover is respectively connected with a kettle inner gas outlet pipe, a kettle inner sampling pipe, a kettle inner sample inlet pipe, a temperature measuring sleeve pipe and a kettle inner gas inlet pipe, the middle of the kettle cover is connected with a stirrer, the kettle inner sample inlet pipe is connected with a needle valve through a pipeline, the needle valve is connected with a metering pump through a pipeline, and the metering pump is connected with a spring type safety valve through a pipeline; the pressure gauge on the sample inlet pipeline is connected with the water tank through a pipeline; the sampling pipe in the kettle is connected with one end of the cooler and a ball valve through pipelines, the ball valve is arranged between the sampling pipe in the kettle and the cooler, and the other end of the cooler is connected with the ball valve; the temperature measuring sleeve is connected with the control cabinet, and the control cabinet is connected with the pressure transmitter and the stirrer. The advantages are that: the evaluation of the dispersing effect of a single dispersant product can be achieved.
Description
Technical Field
The invention relates to the technical field of deposit management of a steam generator of a nuclear power plant, in particular to a method and a device for evaluating high-temperature dispersion performance of a dispersing agent for a nuclear power plant.
Background
Pressurized water reactor nuclear power plants typically employ two measures to minimize deposits on the internal surfaces of the Steam Generator (SG): source item control and end purge; the former is intended to reduce the amount of corrosion products in the feed water entering the SG, and the latter is intended to remove existing deposits from the SG by chemical or mechanical means (e.g., chemical cleaning, hydraulic flushing, etc.). By adopting the measures, the content of corrosion products in SG main feed water can be obviously reduced, however, once the corrosion products enter SG during the normal power operation of a unit, no effective chemical measure can be used for inhibiting the deposition of the corrosion products on the secondary side of the SG; thus, up to 90% of the corrosion products entering the SG deposit on its surface. If the sludge retained on the secondary side of the SG is not removed for a long time, the problems of reduction of heat transfer efficiency of the SG heat transfer pipe, reduction of SG outlet pressure and the like are caused, and even corrosion perforation and the like of the heat transfer pipe are caused in severe cases, so that the safe operation of the SG is threatened. Therefore, a dispersant pollution accumulation control technology for inhibiting corrosion product deposition during power operation of a nuclear power unit is developed in the nuclear power field; it is conventional practice to add dispersants online to the SG feedwater system during nuclear power plant power operations to inhibit the deposition of corrosion products and prevent corrosion products from adhering to the SG component surfaces, and ultimately to effectively remove the corrosion products through the SG blowdown systemCorrosion products are discharged from the SG. This technology relies primarily on the high dispersion properties of the dispersant product towards corrosion products. The existing evaluation method of the dispersant mainly focuses on the scale inhibition performance, such as national standard GB/T16632-2008 'determination of calcium carbonate deposition method of scale inhibition performance of water treatment agent'; however, the dispersant for nuclear power plants is mostly iron oxide (e.g., fe) 3 O 4 Etc.) and the application conditions are mostly high-temperature and high-pressure (such as 280 ℃ saturated steam).
Disclosure of Invention
The invention aims to provide a method and a device for evaluating high-temperature dispersing performance of a dispersing agent for a nuclear power station, which can effectively solve the problem of evaluating the dispersing effect of a dispersing agent product.
The technical scheme of the invention is as follows: a high-temperature dispersion performance evaluation device of a dispersing agent for a nuclear power station comprises a kettle body, wherein the kettle body comprises a heating furnace, the upper part of the heating furnace is covered with a kettle cover, the kettle cover is respectively connected with an in-kettle gas outlet pipe, an in-kettle sampling pipe, an in-kettle sample inlet pipe, a temperature measuring sleeve and an in-kettle gas inlet pipe, a pressure gauge, an explosion type safety valve and a pressure transmitter are connected with the kettle cover through pipelines, the middle of the kettle cover is connected with a stirrer, the in-kettle sample inlet pipe is connected with a needle valve through a pipeline, the needle valve is connected with a metering pump through a pipeline, and the metering pump is connected with a spring type safety valve through a pipeline; the pressure gauge on the sample inlet pipeline is connected with the water tank through a pipeline; the sampling pipe in the kettle is connected with one end of the cooler and a ball valve through pipelines, the ball valve is arranged between the sampling pipe in the kettle and the cooler, and the other end of the cooler is connected with the ball valve; the temperature measuring sleeve is connected with the control cabinet, and the control cabinet is connected with the pressure transmitter and the stirrer.
The temperature measuring sleeve, the sampling tube in the kettle and the air inlet tube in the kettle are inserted into the lower part of the heating furnace, and the sampling tube in the kettle and the air outlet tube in the kettle are inserted into the upper part of the heating furnace.
The rotating shaft and the stirring paddle of the stirrer extend into the bottom of the heating furnace.
A method for evaluating the high-temperature dispersion performance of a dispersant for a nuclear power station comprises the following steps:
step 1: solution preparation and material preparation;
step 2: debugging and running the test device;
and 3, step 3: testing and analyzing the sampled sample.
The step 1 comprises preparing hydrazine solution with the concentration of 200-1000 mug/L, and adjusting the pH value of the solution by 10 percent ammonia water 25℃ When the concentration is 8-10, marking as 'solution A', and taking the solution A as a background solution;
preparing a dispersant solution with ppb-ppm level concentration, and adjusting the pH of the solution by using ammonia water or ethanolamine 25℃ To 8-10, labeled as "solution B", as dispersant test solution;
preparing nano-scale or micron-scale iron oxide solution, and marking as 'solution C'.
The step 2 comprises the following steps:
step 21: and sequentially pouring the solution A and a quantitative solution C into a cleaned high-pressure kettle, and uniformly stirring, wherein the concentration value of the corresponding element of the oxide particles in the kettle is recorded as C. Pouring a certain amount of the solution A into a water tank of an online replenishment device for replenishing liquid in the high-pressure kettle during the operation of the device;
step 22: and screwing down the kettle cover according to the operating specification of the high-pressure kettle, and connecting and assembling the inlet/outlet gas guide pipe, the stirring device, the online supply device and the online sampling device.
Step 23: closing the liquid sampling/replenishing valve, opening the gas inlet/outlet valve, connecting the nitrogen storage device at the gas inlet valve, and introducing N into the kettle 2 To remove the dissolved oxygen in the air and liquid in the kettle, and closing N in turn after the deoxidization is finished 2 The gas cylinder, the gas outlet valve and the gas inlet valve;
step 24: and opening the stirring device, setting a lower stirring speed (20-100 r/min) and stirring the liquid in the kettle at a low speed.
Step 25: setting the heating rate and the operating temperature according to a temperature setting program of the autoclave, sampling on line once every certain time after the liquid in the autoclave is heated to the set temperature and the temperature/pressure is stable, transferring the taken sample into a clean sampling bottle every time, and respectively marking the sample as a sample Z 0-1 、Z 0-2 、Z 0-3 …Z 0-n And storing the test sample. After each sampling, the sample is observed on a displayChanging the temperature/pressure value, and if the temperature deviation exceeds 1 ℃ or the pressure deviation exceeds 0.2MPa, replenishing the liquid amount in the kettle lost due to sampling in time; the above steps 21 to 25 are the first stage tests;
step 26: replacing liquid in an online replenishing water tank with 'solution B', replenishing quantitative 'solution B' into a kettle by using an online replenishing pump, controlling the mass ratio of dispersing agent to particles in the kettle to be 100 t-1 、Z t-2 、Z t-3 …Z t-n And storing the test sample. Observing the change of the temperature/pressure value on the display after sampling every time, and replenishing the liquid amount in the kettle lost due to sampling in time if the temperature deviation exceeds 2 ℃ or the pressure deviation exceeds 0.2 MPa; namely the second stage test;
step 27: after the test is finished, after the liquid in the autoclave is naturally cooled to room temperature, opening the exhaust valve and the autoclave cover in sequence, draining the liquid in the autoclave, and cleaning the autoclave for later use.
The step 3 comprises the following steps:
acidifying the sample to dissolve the particles completely, and measuring the content of related elements by inductively coupled plasma atomic emission spectrometer, sample Z 0-1 、Z 0-2 、Z 0-3 …Z 0-n The test results of (A) are respectively recorded as C 0-1 、C 0-2 、C 0-3 …C 0-n Sample Z t-1 、Z t-2 、Z t-3 …Z t-n The test results of (A) are respectively recorded as C t-1 、C t-2 、C t-3 …C t-n ；
Suspension of blank particles eta during the first stage of the test 0 The calculation formula is as follows:
in the second stage of test, the suspension rate eta of the test group particles t The calculation formula is as follows:
the dispersion efficiency eta of the dispersant is calculated by the formula:
η＝η t -η 0
wherein eta is 0 Representing the suspension rate, eta, of particles in the solution in the kettle caused by background factors such as stirring and the like when no dispersant is added under the test working condition t Representing the suspension rate of particles in the solution in the kettle after the dispersant is added under the test working condition, and the difference eta between the two represents the suspension rate of the particles in the solution in the kettle caused by the action of the dispersant under the test working condition.
The invention has the beneficial effects that: according to the method, the high-temperature dispersion effect of the dispersing agent under the power operation condition of the simulated nuclear power unit can be evaluated, so that the evaluation of the dispersion effect of a single dispersing agent product can be realized, and the comparative analysis of the dispersion effects of different dispersing agent products can be realized. The evaluation method provides a feasible implementation scheme and a calculation method for the evaluation of the high-temperature dispersion effect of the dispersant product for the nuclear power station.
Drawings
FIG. 1 is a schematic view of a high-temperature dispersing performance evaluation apparatus for a dispersant for a nuclear power plant according to the present invention.
In the figure: 1 kettle cover, 2 kettle bodies, 3 heating furnaces, 4 control cabinets, 5 temperature measuring sleeves, 6 stirrers, 7 pressure meters on the kettle cover, 8 blasting safety valves, 9 pressure transmitters, 10 sampling pipes in the kettle, 11 coolers, 12 ball valves, 13 sampling pipes in the kettle, 14 needle valves, 15 metering pumps, 16 pressure meters on the sampling pipes, 17 spring type safety valves, 18 water tanks, 19 air inlet pipes in the kettle, and 20 air outlet pipes in the kettle.
Detailed Description
The invention is further described in detail below with reference to the drawings and specific embodiments.
As shown in fig. 1, a high-temperature dispersion performance evaluation device of a dispersant for a nuclear power station comprises a kettle body 2, wherein the kettle body 2 comprises a heating furnace 3, a kettle cover 1 covers the upper part of the heating furnace 3, and a kettle outlet pipe 20, a kettle sampling pipe 10, a kettle inlet pipe 13, a temperature measuring sleeve 5 and a kettle inlet pipe 19 are respectively connected to the kettle cover 1, wherein the temperature measuring sleeve 5, the kettle sampling pipe 10 and the kettle inlet pipe 19 are inserted into the lower part of the heating furnace 3, the kettle inlet pipe 13 and the kettle outlet pipe 20 are inserted into the upper part of the heating furnace 3, a pressure gauge 7 on the kettle cover, an explosion type safety valve 8 and a pressure transmitter 9 are connected to the kettle cover 1 through pipelines, a stirrer 6 is connected to the middle of the kettle cover 1, a rotating shaft and a stirring paddle of the stirrer 6 are inserted into the bottom of the heating furnace 3, the kettle inlet pipe 13 is connected to a needle valve 14 through a pipeline, the needle valve 14 is connected to a metering pump 15, and the metering pump 15 is connected to a spring type safety valve 17 through a pipeline; the pressure gauge 16 on the sampling pipeline is connected with the water tank 18 through a pipeline; the sampling pipe 10 in the kettle is connected with one end of a cooler 11 and a ball valve through pipelines, the ball valve is arranged between the sampling pipe 10 in the kettle and the cooler 11, and the other end of the cooler 11 is connected with a ball valve 12; the temperature measuring sleeve 5 is connected with the control cabinet 4, and the control cabinet 4 is connected with the pressure transmitter 9 and the stirrer 6.
The invention provides a method for evaluating high-temperature dispersion performance of a dispersant for a nuclear power station, which comprises the following steps of:
step 1: solution preparation and material preparation
Preparing hydrazine solution with a certain concentration (200-1000 mug/L), and adjusting the pH value of the solution by using 10% ammonia water 25℃ To 8-10, labeled "solution A", as background solution.
Preparing a dispersant solution with a certain concentration (ppb-ppm level), and adjusting the pH value of the solution by using ammonia water or ethanolamine 25℃ To 8-10, labeled "solution B", as dispersant test solution.
Accurately weighing and quantifying nanometer or micrometer iron oxide (such as Fe) 3 O 4 Etc., may also be Fe 2 O 3 、CuO、MgO、Al 2 O 3 、CaCO 3 、SiO 2 Equal particles, so that Fe is preferentially selected 3 O 4 Because more than 90 percent of SG sewage sludge of the nuclear power station is Fe 3 O 4 ) The particles were transferred to an erlenmeyer flask, shaken, sonicated for 2h, labeled "solution C".The mass ratio of the dispersing agent to the particles is controlled within the range of 100.
Step 2: test device debugging and operation
The test method uses an autoclave apparatus with on-line stirring, feeding and sampling functions, and the schematic diagram of the apparatus is shown in FIG. 1.
The test for the evaluation of the high temperature dispersion properties with the aid of the above autoclave was carried out in the following detailed procedure:
step 21: and sequentially pouring the solution A and a certain amount of the solution C into a cleaned high-pressure kettle, and stirring and uniformly mixing, wherein the concentration value of the corresponding element of the oxide particles in the kettle is recorded as C. A fixed amount of "solution a" (the prepared background solution described above) was poured into the water tank 18 of the in-line replenishment apparatus for replenishment of the liquid in the autoclave during operation of the apparatus.
Step 22: and (4) screwing down the kettle cover according to the conventional operating specification of the high-pressure kettle, and connecting and assembling the inlet/outlet gas guide pipe, the stirring device, the online supply device and the online sampling device.
Step 23: closing the liquid sampling/replenishing valve, opening the gas inlet/outlet valve, connecting the nitrogen storage device at the gas inlet valve, and introducing N into the kettle 2 To remove the dissolved oxygen in the air and liquid in the kettle, and closing N in turn after the deoxidization is finished 2 Gas cylinder, air outlet valve, admission valve.
And step 24: and opening the stirring device, setting a lower stirring speed (20-100 r/min) and stirring the liquid in the kettle at a low speed.
Step 25: setting a heating rate and an operating temperature according to a temperature setting program of the autoclave, after liquid in the autoclave is heated to a set temperature (such as 200-300 ℃, and preferably 280 ℃ is the secondary side temperature of SG when a nuclear power station operates at normal power and is the application environment temperature of a dispersing agent) and the temperature/pressure (such as 280 ℃/6.8MPa, and correspondingly is the temperature and the pressure of steam at the secondary side of SG when a nuclear power unit operates at full power) are stable, sampling once on line at regular intervals (the sampling amount is 10-30 mL, and the smaller sampling amount is controlled as much as possible to avoid the influence of the sampling process on the pressure fluctuation in the autoclave), transferring the taken sample into a clean sampling bottle each time, and respectively marking the sample as a sample Z 0-1 、Z 0-2 、Z 0-3 …Z 0-n And storing the test sample. And observing the change of the temperature/pressure value on the display after each sampling, and replenishing the liquid amount in the kettle lost due to sampling in time if the temperature deviation exceeds 1 ℃ or the pressure deviation exceeds 0.2 MPa. The above steps 21 to 25 are the first stage (blank set) test.
Step 26: the liquid in the on-line makeup tank was changed to "solution B". And (2) replenishing a certain amount of solution B (high-concentration dispersant solution) into the kettle by using an online replenishment pump (15 in figure 1), controlling the mass ratio of the dispersant to the particles in the kettle to be within a range of 100 t-1 、Z t-2 、Z t-3 …Z t-n And storing the test sample. And observing the change of the temperature/pressure value on the display after each sampling, and replenishing the liquid amount in the kettle lost due to sampling in time if the temperature deviation exceeds 2 ℃ or the pressure deviation exceeds 0.2 MPa. Note: if the dispersing agent is thermally decomposed and loses efficacy under the high-temperature condition, the concentration of the dispersing agent in the sampling liquid is tested at regular intervals in an experiment, and if the concentration deviates from a theoretical value too much, the lost dispersing agent amount needs to be replenished into the kettle through an online replenishing device. Step 26 is the second stage (test set) test.
Step 27: after the test is finished, after the liquid in the kettle is naturally cooled to room temperature, opening the exhaust valve and the kettle cover in sequence, draining the liquid in the kettle, and cleaning the high-pressure kettle for later use.
And step 3: testing and analysis of sampled samples
The sampled sample is acidified to completely dissolve the particles, and then the content of the relevant elements can be determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Sample Z 0-1 、Z 0-2 、Z 0-3 …Z 0-n The test results of (A) are respectively recorded as C 0-1 、C 0-2 、C 0-3 …C 0-n Sample Z t-1 、Z t-2 、Z t-3 …Z t-n The test results of (A) are respectively recorded as C t-1 、C t-2 、C t-3 …C t-n 。
Suspension of blank particles eta during the first stage of the test 0 The calculation formula is as follows:
in the second stage of test, the suspension rate eta of the test group particles t The calculation formula is as follows:
the dispersion efficiency eta of the dispersant is calculated by the formula:
η＝η t -η 0
in the present evaluation method,. Eta 0 Representing the suspension rate, eta, of particles in the solution in the kettle caused by background factors such as stirring and the like when no dispersant is added under the test working condition t Representing the suspension rate of particles in the solution in the kettle after the dispersant is added under the test working condition, and the difference eta between the two represents the suspension rate of the particles in the solution in the kettle caused by the action of the dispersant under the test working condition.
For a better understanding of the present disclosure, the following are specifically described:
(1) the invention is not limited to the high temperature of 280 ℃, and can be used under any temperature condition within the range of 20-300 ℃, and the requirement of the pressure in the corresponding high-pressure autoclave is above the saturated steam pressure corresponding to the temperature in the autoclave.
(2) The dispersant used in the invention is not limited to the acrylic acid polymer in the nuclear power field at present, but also can be methacrylic acid polymer, acrylate polymer, methacrylate polymer and copolymer and terpolymer thereof, or acrylate/acrylamide copolymer, acrylate/methacrylate copolymer, terpolymer and mixture thereof.
(3) The particles used in the invention not onlyRestricted to Fe only 3 O 4 Particles, which may also be Fe 2 O 3 、CuO、MgO、Al 2 O 3 、CaCO 3 、SiO 2 The particles are equal, or the actual mud of the SG of the nuclear power station, or the mud at any pipeline position in the nuclear power field, or the mixture of the particles or the mud. D of granules or sludge 50 The size can be in the nanometer or micron scale.
(4) The background solution used by the invention can be high-purity water, can also be a secondary loop water chemical system solution (containing ammonia water, ethanolamine, hydrazine and other substances) of a nuclear power station, and can also contain other conventional anions and cations (potassium, sodium, calcium, magnesium, chlorine, sulfate radicals, nitrate radicals, phosphate radicals and the like), without requirements.
Claims (7)
1. A high-temperature dispersibility evaluation device for a dispersant for a nuclear power plant is characterized in that: the device comprises a kettle body, wherein the kettle body comprises a heating furnace, the upper part of the heating furnace is covered with a kettle cover, the kettle cover is respectively connected with an in-kettle gas outlet pipe, an in-kettle sampling pipe, an in-kettle sample inlet pipe, a temperature measuring sleeve pipe and an in-kettle gas inlet pipe, a pressure gauge, an explosion type safety valve and a pressure transmitter are connected with the kettle cover through pipelines, the middle of the kettle cover is connected with a stirrer, the in-kettle sample inlet pipe is connected with a needle valve through a pipeline, the needle valve is connected with a metering pump through a pipeline, and the metering pump is connected with a spring type safety valve through a pipeline; the pressure gauge on the sample inlet pipeline is connected with the water tank through a pipeline; the sampling pipe in the kettle is connected with one end of the cooler and a ball valve through pipelines, the ball valve is arranged between the sampling pipe in the kettle and the cooler, and the other end of the cooler is connected with the ball valve; the temperature measuring sleeve is connected with the control cabinet, and the control cabinet is connected with the pressure transmitter and the stirrer.
2. The apparatus for evaluating high-temperature dispersibility of a dispersant for a nuclear power plant according to claim 1, wherein: the temperature measuring sleeve, the sampling tube in the kettle and the air inlet tube in the kettle are inserted into the lower part of the heating furnace, and the sampling tube in the kettle and the air outlet tube in the kettle are inserted into the upper part of the heating furnace.
3. The apparatus for evaluating the high-temperature dispersibility of a dispersant for a nuclear power plant according to claim 1, wherein: the rotating shaft and the stirring paddle of the stirrer extend into the bottom of the heating furnace.
4. A method for evaluating high-temperature dispersibility of a dispersant for a nuclear power plant, comprising the steps of:
step 1: solution preparation and material preparation;
step 2: debugging and running the test device;
and 3, step 3: testing and analyzing the sampled sample.
5. The method for evaluating the high-temperature dispersibility of the dispersant for the nuclear power plant as claimed in claim 4, wherein: the step 1 comprises preparing hydrazine solution with concentration of 200-1000 mug/L, and adjusting pH of the solution with 10% ammonia water 25℃ When the concentration is 8-10, marking as 'solution A', and taking the solution A as a background solution;
preparing a dispersant solution with ppb-ppm level concentration, and adjusting the pH value of the solution by using ammonia water or ethanolamine 25℃ When the concentration is 8-10, marking as 'solution B', and using the solution as a dispersant test solution;
preparing nano-scale or micron-scale iron oxide solution, and marking as 'solution C'.
6. The method for evaluating the high-temperature dispersing ability of a dispersant for nuclear power plants as defined in claim 4, wherein said step 2 comprises the steps of:
step 21: and sequentially pouring the solution A and a certain amount of the solution C into a cleaned high-pressure kettle, and stirring and uniformly mixing, wherein the concentration value of the corresponding element of the oxide particles in the kettle is recorded as C. Pouring a certain amount of the solution A into a water tank of an online replenishing device, and replenishing liquid in the high-pressure kettle during the operation of the device;
step 22: and screwing down the kettle cover according to the operating specification of the high-pressure kettle, and connecting and assembling the inlet/outlet gas guide pipe, the stirring device, the online supply device and the online sampling device.
Step 23: closing the liquid sampling/replenishing valve, opening the gas inlet/outlet valve atThe air inlet valve is connected with a nitrogen storage device, and N is introduced into the kettle 2 To remove dissolved oxygen in air and liquid in the kettle, and sequentially closing N after the oxygen removal is finished 2 The gas cylinder, the gas outlet valve and the gas inlet valve;
and step 24: and opening the stirring device, setting a lower stirring speed (20-100 r/min) and stirring the liquid in the kettle at a low speed.
Step 25: setting the heating rate and the operating temperature according to the temperature setting program of the autoclave, sampling on line once every certain time after the liquid in the autoclave is heated to the set temperature and the temperature/pressure is stable, transferring the taken sample into a clean sampling bottle every time, and respectively marking the sample as a sample Z 0-1 、Z 0-2 、Z 0-3 …Z 0-n And storing the test sample. Observing the change of the temperature/pressure value on the display after sampling every time, and replenishing the liquid amount in the kettle lost due to sampling in time if the temperature deviation exceeds 1 ℃ or the pressure deviation exceeds 0.2 MPa; the above steps 21 to 25 are the first stage tests;
step 26: replacing liquid in an online replenishing water tank with 'solution B', replenishing quantitative 'solution B' into a kettle by using an online replenishing pump, controlling the mass ratio of dispersing agent to particles in the kettle to be 100 t-1 、Z t-2 、Z t-3 …Z t-n And storing the test sample. Observing the change of the temperature/pressure value on the display after sampling each time, and supplementing the liquid amount in the kettle lost due to sampling in time if the temperature deviation exceeds 2 ℃ or the pressure deviation exceeds 0.2 MPa; namely the second stage test;
step 27: after the test is finished, after the liquid in the autoclave is naturally cooled to room temperature, opening the exhaust valve and the autoclave cover in sequence, draining the liquid in the autoclave, and cleaning the autoclave for later use.
7. The method for evaluating the high-temperature dispersing ability of a dispersant for a nuclear power plant as set forth in claim 4, wherein said step 3 comprises the steps of:
sampling the sampleAcidifying to dissolve the particles completely, and measuring the content of related elements by inductively coupled plasma atomic emission spectrometer, sample Z 0-1 、Z 0-2 、Z 0-3 …Z 0-n The test results of (A) are respectively recorded as C 0-1 、C 0-2 、C 0-3 …C 0-n Sample Z t-1 、Z t-2 、Z t-3 …Z t-n The test results of (A) are respectively recorded as C t-1 、C t-2 、C t-3 …C t-n ；
Suspension ratio eta of blank particles during the first stage of the test 0 The calculation formula is as follows:
in the second stage of the test, the suspension rate eta of the group particles is tested t The calculation formula is as follows:
the dispersion efficiency η of the dispersant is calculated by the formula:
η＝η t -η 0
wherein eta is 0 Representing the suspension rate, eta, of particles in the solution in the kettle caused by background factors such as stirring and the like when no dispersant is added under the test working condition t Representing the suspension rate of particles in the solution in the kettle after the dispersant is added under the test working condition, and the difference eta between the two represents the suspension rate of the particles in the solution in the kettle caused by the action of the dispersant under the test working condition.
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| CN202211251636.4A CN115683767A (en) | 2022-10-13 | 2022-10-13 | Method and device for evaluating high-temperature dispersion performance of dispersing agent for nuclear power station |
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| CN202211251636.4A CN115683767A (en) | 2022-10-13 | 2022-10-13 | Method and device for evaluating high-temperature dispersion performance of dispersing agent for nuclear power station |
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