CN115683767A - A method and device for evaluating the high-temperature dispersion performance of a dispersant for nuclear power plants - Google Patents

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

A method and device for evaluating the high-temperature dispersion performance of a dispersant for nuclear power plants

technical field

The invention relates to the technical field of deposit management of steam generators in nuclear power plants, in particular to a method and device for evaluating the high-temperature dispersion performance of dispersants used in nuclear power plants.

Background technique

Pressurized water reactor nuclear power plants usually adopt two measures to minimize deposits on the inner surface of the steam generator (SG): source term control and terminal removal; the purpose of the former is to reduce the amount of corrosion products in the feed water entering the SG, and the latter is to Remove existing deposits from SG using chemical or mechanical means (e.g. chemical cleaning, hydroflushing, etc.). The above measures can significantly reduce the content of corrosion products in the SG main feed water. However, once the corrosion products enter the SG during the normal power operation of the unit, there are no effective chemical measures to inhibit their deposition on the secondary side of the SG; therefore, the corrosion products entering the SG Up to 90% of the corrosion products are deposited on its surface. If the sludge remaining on the secondary side of the SG is not removed for a long time, it will lead to problems such as a decrease in the heat transfer efficiency of the SG heat transfer tube and a drop in the outlet pressure of the SG. In severe cases, it may even lead to corrosion and perforation of the heat transfer tube, threatening Safe operation of SG. For this reason, the field of nuclear power has developed a dispersant fouling control technology that inhibits the deposition of corrosion products during the power operation of nuclear power units; the conventional practice is to add dispersants online to the SG water supply system during power operation of nuclear power units to inhibit corrosion The deposition of products prevents corrosion products from adhering to the surface of SG components, and finally effectively discharges corrosion products from SG through the SG sewage system. This technology mainly relies on the efficient dispersion performance of dispersant products for corrosion products. The evaluation methods of existing dispersants mainly focus on their scale inhibition performance, such as the national standard GB/T 16632-2008 "Calcium Carbonate Deposition Method for Determination of Scale Inhibition Performance of Water Treatment Agents"; however, most of the dispersants used in nuclear power plants are It is iron oxide (such as Fe ₃ O ₄ , etc.) particles, and its application conditions are mostly high temperature and high pressure (such as 280°C saturated steam) conditions.

Contents of the invention

The purpose of the present invention is to provide a method and device for evaluating the high-temperature dispersion performance of a dispersant for nuclear power plants, which can effectively solve the problem of evaluating the dispersion effect of powder products.

The technical scheme of the present invention is as follows: a high-temperature dispersion performance evaluation device for a dispersant used in a nuclear power plant, comprising a kettle body, the kettle body includes a heating furnace, the upper part of the heating furnace is covered with a kettle cover, and the kettle cover is respectively connected with a gas outlet pipe in the kettle, a kettle The inner sampling pipe, the sampling pipe in the kettle, the temperature measuring sleeve and the inlet pipe in the kettle, the pressure gauge, the explosion safety valve and the pressure transmitter are connected to the kettle cover through pipelines, and the middle of the kettle cover is connected with a stirrer, and the inside of the kettle is The sample tube is connected to the needle valve through the pipeline, the needle valve is connected to the metering pump through the pipeline, and the metering pump is connected to the spring safety valve through the pipeline; the pressure gauge on the sampling pipeline is connected to the water tank through the pipeline; A ball valve is connected, a ball valve is set between the sampling pipe in the kettle and the cooler, and the other end of the cooler is connected to the ball valve; the temperature measuring sleeve is connected to the control cabinet, and the control cabinet is connected to the pressure transmitter and the agitator.

The temperature measuring sleeve, the sampling pipe in the kettle and the inlet pipe in the kettle are inserted into the lower part of the heating furnace, and the sampling pipe in the kettle and the gas outlet pipe in the kettle are inserted into the upper part of the heating furnace.

The rotating shaft and stirring paddle of the agitator go deep into the bottom of the heating furnace.

A method for evaluating the high-temperature dispersion performance of a dispersant for nuclear power plants, comprising the following steps:

Step 1: Solution configuration and material preparation;

Step 2: Commissioning and operation of the test device;

Step 3: Test and analyze the sample.

The step 1 includes configuring a hydrazine solution with a concentration of 200-1000 μg/L, adjusting the pH of the solution from _25°C to 8-10 with 10% ammonia water, and marking it as "solution A" as a background solution;

Prepare a dispersant solution with a concentration of ppb~ppm, adjust the pH of the solution from _25°C to 8~10 with ammonia water or ethanolamine, and mark it as "solution B" as a dispersant test solution;

Prepare a nanoscale or microscale iron oxide solution, labeled as "Solution C".

Described step 2 comprises as follows:

Step 21: Pour "Solution A" and quantitative "Solution C" into the cleaned autoclave in turn, stir and mix well, and record the corresponding element concentration value of the oxide particles in the autoclave as C. Pour the quantitative "solution A" into the water tank of the online replenishment device for the replenishment of the liquid in the autoclave during the operation of the device;

Step 22: Tighten the lid of the autoclave according to the operating procedures of the autoclave, and connect and assemble the inlet/outlet air duct, stirring, online supply, and online sampling devices.

Step 23: Close the liquid sampling/supply valve, open the air inlet/outlet valve, connect the nitrogen gas storage device at the inlet valve, and feed _N2 into the kettle to remove the air in the kettle and the dissolved oxygen in the liquid, and close them in turn after deoxygenation is completed N ₂ cylinders, outlet valve, inlet valve;

Step 24: Turn on the stirring device, set a low stirring rate (20-100r/min), and stir the liquid in the kettle at a low speed.

Step 25: Set the heating rate and operating temperature according to the autoclave temperature setting program. After the liquid in the autoclave is heated up to the set temperature and the temperature/pressure is stable, take samples online at regular intervals, and transfer the taken out samples into the In clean sampling bottles, marked as samples Z _0-1 , Z _0-2 , Z _0-3 ... Z _0-n , and stored for testing. Observe the change of the temperature/pressure value on the display after each sampling. If the temperature deviates by more than 1°C or the pressure deviates by more than 0.2MPa, timely replenish the amount of liquid in the kettle lost due to sampling; the above steps 21 to 25 are the first stage test;

Step 26: Replace the liquid in the online make-up water tank with "solution B", and use the online make-up pump to supply a certain amount of "solution B" into the kettle, so that the mass ratio of dispersant to particles in the kettle is controlled at 100:1~1:100, After the temperature/pressure is stabilized, take samples online at regular intervals, transfer the taken samples into clean sampling bottles each time, and mark them as samples Z _t-1 , Z _t-2 , Z _t-3 ... Z _tn , stored for testing. Observe the change of temperature/pressure value on the display after each sampling. If the temperature deviates by more than 2°C or the pressure deviates by more than 0.2MPa, timely replenish the amount of liquid in the kettle lost due to sampling; it is the second stage of the test;

Step 27: After the test is over, after the liquid in the autoclave is naturally cooled to room temperature, open the exhaust valve and the lid of the autoclave in turn, drain the liquid in the autoclave, clean the autoclave, and set it aside.

Described step 3 comprises as follows:

Acidify the sampling sample to completely dissolve the particles, then use an inductively coupled plasma atomic emission spectrometer to measure the content of relevant elements, and record the test results of samples Z _0-1 , Z _0-2 , Z _0-3 ... Z _0-n respectively C _0-1 , C _0-2 , C _0-3 ... C _0-n , the test results of samples Z _t-1 , Z _t-2 , Z _t-3 ... Z _tn are recorded as C _t-1 , Ct _-2 , Ct _-3 ... _Ctn ;

During the first phase of the test, the suspension rate _η of the blank group particles The calculation formula is:

During the second stage of the test, the calculation formula of the suspension rate η _t of the test group particles is:

The formula for calculating the dispersion efficiency η of the dispersant is:

η=η _t -η ₀

Wherein, η ₀ represents the suspension rate of particles in the solution in the kettle caused by background factors such as stirring when no dispersant is added under the above-mentioned test working conditions, and η _t represents the particles in the solution in the kettle after adding the dispersant under the above-mentioned test working conditions The suspension rate of the two, and the difference η represents the suspension rate of the particles in the solution in the kettle caused by the action of the dispersant under the above-mentioned test conditions.

The beneficial effect of the present invention is that: according to the method of the present invention, the high-temperature dispersion effect of the dispersant under the power operation condition of the simulated nuclear power unit can be evaluated, not only the evaluation of the dispersion effect of a single dispersant product can be realized, but also the dispersion of different dispersant products can be realized. Comparative analysis of effects. This evaluation method provides a feasible implementation plan and calculation method for the evaluation of high temperature dispersion effect of dispersant products used in nuclear power plants.

Description of drawings

Fig. 1 is a schematic diagram of a high-temperature dispersion performance evaluation device for a nuclear power plant dispersant provided by the present invention.

In the figure: 1 kettle cover, 2 kettle body, 3 heating furnace, 4 control cabinet, 5 temperature measuring sleeve, 6 agitator, 7 pressure gauge on the kettle cover, 8 blasting safety valve, 9 pressure transmitter, 10 kettle Inner sampling pipe, 11 cooler, 12 ball valve, 13 sampling pipe in the kettle, 14 needle valve, 15 metering pump, 16 pressure gauge on the sampling pipeline, 17 spring safety valve, 18 water tank, 19 inlet pipe in the kettle, 20 The outlet pipe in the kettle.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a high-temperature dispersion performance evaluation device for a dispersant used in a nuclear power plant includes a kettle body 2, the kettle body 2 includes a heating furnace 3, the upper part of the heating furnace 3 is covered with a kettle cover 1, and the kettle cover 1 is respectively connected with a kettle Inner outlet pipe 20, sampling pipe 10 in the kettle, sampling pipe 13 in the kettle, temperature measuring sleeve 5 and air inlet pipe 19 in the kettle, wherein, the temperature measuring sleeve 5, sampling pipe 10 in the kettle and air inlet pipe 19 in the kettle are inserted To the lower part of the heating furnace 3, the sample inlet pipe 13 in the kettle and the gas outlet pipe 20 in the kettle are inserted into the upper part of the heating furnace 3, and the pressure gauge 7, explosion safety valve 8 and pressure transmitter 9 on the kettle cover are connected to the kettle cover through pipelines 1. An agitator 6 is connected to the middle of the kettle cover 1. The rotating shaft and the stirring paddle of the agitator 6 go deep into the bottom of the heating furnace 3. The sampling pipe 13 in the kettle is connected to the needle valve 14 through the pipeline, and the needle valve 14 is connected to the metering pump through the pipeline. 15, the metering pump 15 is connected to the spring safety valve 17 through the pipeline; the pressure gauge 16 on the sampling pipeline is connected to the water tank 18 through the pipeline; the sampling pipe 10 in the kettle is connected to one end of the cooler 11 and a ball valve through the pipeline, and the sampling pipe in the kettle A ball valve is set between 10 and cooler 11, and the other end of cooler 11 is connected to ball valve 12; temperature measuring sleeve 5 is connected to control cabinet 4, and control cabinet 4 is connected to pressure transmitter 9 and agitator 6.

A method for evaluating the high-temperature dispersion performance of a dispersant for nuclear power plants provided by the invention comprises the following steps:

Step 1: Solution configuration and material preparation

Prepare a hydrazine solution with a certain concentration (200-1000 μg/L), adjust the pH of the solution from _25°C to 8-10 with 10% ammonia water, and mark it as "solution A" as the background solution.

Prepare a dispersant solution with a certain concentration (ppb-ppm level), adjust the pH of the solution from _25°C to 8-10 with ammonia water or ethanolamine, and mark it as "solution B" as the dispersant test solution.

Accurately weigh and quantify nanoscale or micronscale iron oxides (such as Fe ₃ O ₄ , etc., or Fe ₂ O ₃ , CuO, MgO, Al ₂ O ₃ , CaCO ₃ , SiO _{2 ,} etc., the reason why Fe is preferred ₃ O ₄ , because more than 90% of the nuclear power plant SG sludge is Fe ₃ O ₄ ) particles, transferred to a Erlenmeyer flask, shaken evenly, stirred and ultrasonicated for 2 hours, and marked as "solution C". The mass ratio of dispersant to particles is controlled within the range of 100:1 to 1:100.

Step 2: Commissioning and operation of the test device

This test method uses an autoclave device with on-line stirring, replenishment and sampling functions. The schematic diagram of the device is shown in Figure 1.

With the help of the above-mentioned autoclave, the test of high-temperature dispersion performance evaluation is carried out, and the detailed steps are as follows:

Step 21: Pour "Solution A" and quantitative "Solution C" into the cleaned autoclave in turn, stir and mix well, and record the corresponding element concentration value of the oxide particles in the autoclave as C. Pour the quantitative "solution A" (the above-mentioned prepared background solution) into the water tank 18 of the online replenishment device for the replenishment of the liquid in the autoclave during the operation of the device.

Step 22: Tighten the lid of the autoclave according to the normal operating procedures of the autoclave, and connect and assemble the inlet/outlet air duct, stirring, online supply, and online sampling devices.

Step 23: Close the liquid sampling/supply valve, open the air inlet/outlet valve, connect the nitrogen gas storage device at the inlet valve, and feed _N2 into the kettle to remove the air in the kettle and the dissolved oxygen in the liquid, and close them in turn after deoxygenation is completed N ₂ gas cylinder, outlet valve, inlet valve.

Step 24: Turn on the stirring device, set a low stirring rate (20-100r/min), and stir the liquid in the kettle at a low speed.

Step 25: Set the heating rate and operating temperature according to the autoclave temperature setting program, and wait until the liquid in the autoclave is heated up to the set temperature (such as 200-300°C, preferably 280°C). After the dispersant application ambient temperature) and temperature/pressure (such as 280°C/6.8MPa, corresponding to the temperature and pressure of the SG secondary side steam when the nuclear power unit is in full power operation) are stable, take online samples at regular intervals (sample volume In the range of 10-30mL, in order to avoid the influence of the sampling process on the pressure fluctuation in the kettle, try to control the smaller sampling volume), transfer the taken samples into clean sampling bottles each time, and mark them as samples Z _0-1 , Z _0-2 , Z _0-3 ... Z _0-n , stored for testing. Observe the change of the temperature/pressure value on the display after each sampling. If the temperature deviates by more than 1°C or the pressure deviates by more than 0.2MPa, timely replenish the amount of liquid in the kettle lost due to sampling. The above steps 21 to 25 are the first stage (blank group) test.

Step 26: Replace the liquid in the online make-up water tank with "Solution B". Use the online replenishment pump (15 in Figure 1) to supply a certain amount of "solution B" (a high-concentration dispersant solution) to the kettle, so that the mass ratio of the dispersant to the particles in the kettle is controlled within the range of 100:1 to 1:100, After the temperature/pressure is stabilized, take a sample online at regular intervals (the sampling volume is 10-30mL, in order to avoid the influence of the sampling process on the pressure fluctuation in the kettle, try to control the small sampling volume), each time the sample taken out Transfer them into clean sampling bottles, mark them as samples Z _t-1 , Z _t-2 , Z _t-3 ... Z _tn , and store them for testing. Observe the change of the temperature/pressure value on the display after each sampling. If the temperature deviates by more than 2°C or the pressure deviates by more than 0.2MPa, timely replenish the amount of liquid in the kettle lost due to sampling. Note: If the dispersant will be thermally decomposed under high temperature conditions and become invalid, test the concentration of the dispersant in the sampled liquid at regular intervals during the experiment. If the concentration deviates too much from the theoretical value, it is necessary to replenish the loss in the kettle through the online supply device dispersant dose. Step 26 is the second stage (test group) experiment.

Step 27: After the test is over, after the liquid in the autoclave is naturally cooled to room temperature, open the exhaust valve and the lid of the autoclave in turn, drain the liquid in the autoclave, clean the autoclave, and set it aside.

Step 3: Test and analysis of sample

The sample is acidified to completely dissolve the particles, and then the content of related elements can be measured by inductively coupled plasma atomic emission spectrometer (ICP-AES). The test results of samples Z _0-1 , Z _0-2 , Z _0-3 …Z _0-n 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 _tn test results are recorded as C _t-1 , C _t-2 , C _t-3 ... C _tn respectively.

During the first phase of the test, the suspension rate _η of the blank group particles The calculation formula is:

During the second stage of the test, the calculation formula of the suspension rate η _t of the test group particles is:

The formula for calculating the dispersion efficiency η of the dispersant is:

η=η _t -η ₀

In this evaluation method, η ₀ represents the suspension rate of particles in the solution in the kettle caused by background factors such as stirring when no dispersant is added under the above-mentioned test working conditions, _{and η} represents the suspension rate in the kettle after adding the dispersant under the above-mentioned test working conditions. The suspension rate of the particles in the solution, the difference η 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 above test conditions.

In order to better understand the content of the present invention, it is specially explained as follows:

① The present invention is not limited to the high temperature of 280°C, but can be used at any temperature in the range of 20-300°C, and the corresponding pressure requirement in the autoclave is above the saturated steam pressure corresponding to the temperature in the autoclave.

2. The dispersant used in the present invention is not only limited to the acrylic acid polymers in the field of nuclear power, but also methacrylic acid polymers, acrylate polymers, methacrylate polymers and their copolymers, terpolymers, or acrylic acid polymers Esters/acrylamide copolymers, acrylate/methacrylate copolymers, terpolymers and mixtures thereof.

③ The particles used in the present invention are not limited to Fe ₃ O ₄ particles, but can also be particles such as Fe ₂ O ₃ , CuO, MgO, Al ₂ O ₃ , CaCO ₃ , SiO ₂ , or the real sludge of nuclear power plant SG, or The sludge at any pipeline position in the field of nuclear power can also be a mixture of the above particles or sludge. The _D50 size of the particles or sludge can be in the nanoscale or microscale.

4. the used background solution of the present invention can be high-purity water, also can be nuclear power plant secondary circuit water chemical system solution (wherein comprise substances such as ammoniacal liquor, ethanolamine, hydrazine), also can comprise other conventional anions and cations (potassium, sodium, calcium, magnesium, chlorine , sulfate, nitrate, phosphate, etc.), no requirement.

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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