CN117420044A - Industrial chemical cleaning dynamic simulation verification and evaluation method - Google Patents
Industrial chemical cleaning dynamic simulation verification and evaluation method Download PDFInfo
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- CN117420044A CN117420044A CN202311505247.4A CN202311505247A CN117420044A CN 117420044 A CN117420044 A CN 117420044A CN 202311505247 A CN202311505247 A CN 202311505247A CN 117420044 A CN117420044 A CN 117420044A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
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- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses an industrial chemical cleaning dynamic simulation verification evaluation method, which comprises the following steps: calculating the dosage and the water distribution amount required by preparing the cleaning agent with a certain concentration; (ii) preparing a cleaning agent; (iii) a detergent descaling performance test; (iv) calculating the descaling rate; (v) testing the corrosion performance of the cleaning agent and calculating the corrosion rate; (vi) detecting the influence of the concentration of the cleaning agent, the pressure of the process flow and the temperature of the process flow on the cleaning effect under the flow rate and the flow velocity of the process flow; (vii) determining the cleaning effect at different cleaning agent concentrations, process flow rates, process pressure and process temperature, and determining the optimal cleaning environment. According to the invention, a chemical cleaning dynamic simulation verification experimental device is set up, and different cleaning processes are designed to compare cleaning effects of different cleaning agents under the same working condition; and testing the performance of the same cleaning agent under different working conditions to determine the optimal working condition.
Description
Technical Field
The invention belongs to the field of chemical cleaning agent research, and particularly relates to an industrial chemical cleaning dynamic simulation verification evaluation method.
Background
With the exploration discovery and development of productivity construction, the Bohai sea oil field develops into a fast lane, and in the process of increasing storage and production of the Bohai sea oil field, with the continuous expansion of production scale and long-term operation of equipment and facilities, the waste generated by an ocean oil gas platform is rapidly increased, so that higher requirements are put forward for the development of the industrial cleaning industry.
The company is the only industrial cleaning professional service company in the sea oil system, about 460 heat exchangers which need to be cleaned every year are cleaned by mainly utilizing high-pressure water jet, the workload and the safety risk are large, and the cleaning efficiency is low. Meanwhile, due to the application of the Bohai sea oilfield chemical oil extraction technology, a large amount of oil sludge, heavy oil dirt and the like are generated while the oil extraction rate is improved, so that the cleaning construction difficulty is increased, and the cleaning quality requirement is difficult to meet by adopting a physical and manual cleaning mode for special-shaped structural equipment and facilities. At present, the heat exchanger is cleaned by adopting a high-pressure water jet cleaning technology, mainly manual handheld cleaning is adopted, the manual cleaning is high in safety risk, large in workload and low in efficiency. The conventional cleaning technology is various, but the built cleaning experimental device is basically limited to a physical cleaning method, the study on the cleaning effect of chemical cleaning on dirt is less, the experiment table is mostly in a theoretical stage, the adjustment of the working condition of the cleaning agent is difficult to realize, and the simulation accuracy is poor. However, the current chemical cleaning agents are of various types, and the composition and the use environment of the chemical cleaning agents influence the cleaning effect of the chemical cleaning agents on dirt. The cleaning agent with poor cleaning effect is used, so that manpower and material resources are wasted, and the cleaning effect is not obvious; in addition, the chemical cleaning agent has corrosion effect on the cleaned object, and the waste liquid generated by chemical cleaning also pollutes the environment. Therefore, the chemical cleaning experimental device is built, and the type of the chemical cleaning agent with the optimal cleaning effect on specific dirt and the use environment thereof are tested and obtained, so that the method has important significance for energy conservation and emission reduction.
The simulated evaluation technology is a data collection and analysis method based on a virtual environment or a real situation, and is used for evaluating the performance and effect of a system, a process or a strategy. Such techniques may help analysts to better understand system functionality, identify potential problems, and predict future likely events. The simulation evaluation technology can test various feasibility schemes without actual investment; a large amount of data can be obtained, data analysis is carried out, and the optimal configuration of the system is determined; allowing the user to learn system dynamics and changes faster to make updated decisions. By virtue of the advantages, the simulation evaluation technology is widely applied to a plurality of fields such as engineering design, teaching, medical care, aerospace/automobile/transportation systems, environmental protection and the like. Different cleaning methods and cleaning environments can affect the cleaning effect on dirt. The cleaning method with poor cleaning effect not only wastes manpower and material resources, but also has no obvious cleaning effect. Therefore, scientists adopt a simulation evaluation technology, and influence of different cleaning methods on the cleaning effect of dirt under variable conditions is simulated and analyzed by a method of setting up a cleaning experimental device.
Disclosure of Invention
The invention provides a dynamic simulation verification and evaluation method for industrial chemical cleaning, which aims to overcome the defects in the prior art.
The invention is realized by the following technical scheme:
an industrial chemical cleaning dynamic simulation verification and evaluation method comprises the following steps:
calculating the dosage and the water distribution amount required by the configuration of the cleaning agent;
(ii) preparing a cleaning agent;
(iii) a detergent descaling performance test;
(iv) calculating the descaling rate;
(v) testing the corrosion performance of the cleaning agent and calculating the corrosion rate;
(vi) detecting the influence of the concentration of the cleaning agent, the pressure of the process flow and the temperature of the process flow on the cleaning effect under the flow rate and the flow velocity of the process flow;
(vii) determining the cleaning effect at different cleaning agent concentrations, process flow rates, process pressure and process temperature, and determining the optimal cleaning environment.
In the above technical scheme, the calculation formulas of the medicine amount and the water distribution amount are as follows:
V z ＝V s +V b +V d
wherein: v (V) s The volume of the residual cleaning agent in the liquid storage tank is shown as m 3 ；
ρ s The density of the residual cleaning agent in the liquid storage tank is kg/m 3 ；
w s Concentration of the residual cleaning agent in the liquid storage tank;
ρ q the density of the medicament in the medicament adding box is kg/m 3 ；
w q Concentration of the medicament in the medicament adding box,%;
ρd-distribution Density in kg/m 3 ；
w z Final concentration of cleaning agent in the liquid storage tank;
V z the final volume of the cleaning agent in the liquid storage tank is shown as m 3 ；
Q b Flow rate of dosing metering pump, unit is m 3 /h；
V b -the dosage of the medicine is m 3 ；
V d The unit of the water distribution is m 3 ；
t b The running time of the metering pump is s.
In the technical scheme, the specific method for the detergent descaling performance test experiment comprises the following steps:
(a) Determining a branch where a detected object is located, opening cleaning regulating valves in front of and behind the branch where the detected object is located, closing the cleaning regulating valves of the branches of the other two detected objects, and opening separation regulating valves in front of and behind a bypass of the solid-liquid separator;
(b) Determining a pumping scheme according to the flow demand, and switching the two centrifugal pump branches and the regulating valve on the serial passage;
(c) Opening a discharge hand valve at a discharge port of the liquid storage tank, and setting the frequency of the centrifugal pump and the opening of a main-way electromagnetic valve and a loop electromagnetic valve;
(d) Starting a centrifugal pump, pumping the cleaning agent to the tested object through the centrifugal pump, enabling the cleaning agent to flow back to the liquid storage tank through the bypass of the solid-liquid separator after the cleaning agent acts on the tested object, and starting the cleaning agent descaling performance test.
In the above technical solution, the calculation formula of the descaling rate is:
wherein: n-descaling rate;
M 0 -the original measured object mass in kg;
M 1 the mass of the measured object after on-site cleaning is kg;
M 2 the mass of the tested object after thorough cleaning in the laboratory is in kg.
In the above technical solution, the corrosion rate calculation formula is:
wherein: y is 1 The static corrosion rate of the cleaning agent is in mm/a;
y 2 cleaning agent static corrosion rate in g/m 2 ·h；
m 0 -the original mass of the test piece, wherein the unit is g;
m 1-the residual mass of the test piece, wherein the unit is g;
s-surface area of test piece in cm 2 ；
t-experimental time, the unit is h;
ρ -the density of the test piece material in g/cm 3 。
In the technical scheme, the device adopted by the evaluation method comprises a dosing tank, a liquid storage tank, a centrifugal pump bypass, a cleaned object bypass and a solid-liquid separator bypass which are sequentially connected to form a loop, wherein the centrifugal pump bypass is communicated with a discharge port of the liquid storage tank, the solid-liquid separator bypass is communicated with a liquid return port of the liquid storage tank, the dosing tank is communicated with a drug inlet of the liquid storage tank, and a water inlet of the liquid storage tank is communicated with a water distribution pipeline; a cleaning liquid loop is arranged between a liquid return port of the liquid storage tank and a bypass outlet of the centrifugal pump, and a loop electromagnetic valve is arranged on the cleaning liquid loop; a water distribution regulating valve and a water distribution flowmeter are arranged on the water distribution pipeline; a dosing metering pump is arranged between the dosing tank and the dosing inlet of the liquid storage tank, and dosing regulating valves are arranged in front of and behind the dosing metering pump.
In the technical scheme, the stirrer and the electric heater are arranged in the liquid storage tank, the liquid outlet and the detection sampling port are arranged at the bottom of the liquid storage tank, the sampling hand valve is arranged at the detection sampling port, the liquid outlet is provided with the liquid discharge hand valve, and the discharge port of the liquid storage tank is provided with the discharge hand valve; the liquid storage tank is provided with a storage tank liquid level meter, a storage tank pressure meter and a storage tank thermometer.
In the technical scheme, the centrifugal pump bypass comprises two centrifugal pump branches connected in parallel, and each centrifugal pump branch is sequentially provided with a centrifugal pump outlet valve, an outlet pressure gauge, a centrifugal pump, an inlet pressure gauge and a centrifugal pump inlet valve; a serial connection passage is arranged between the two centrifugal pump branches, one end of the serial connection passage is connected with the outlet end of the centrifugal pump on one branch, the other end of the serial connection passage is connected with the inlet end of the centrifugal pump on the other branch, and a serial connection regulating valve is arranged on the serial connection passage; and a centrifugal pump flowmeter and a main solenoid valve are arranged between the centrifugal pump bypass and the cleaned object bypass, and the main solenoid valve is arranged close to an outlet of the centrifugal pump bypass.
In the technical scheme, the bypass of the solid-liquid separator comprises a solid-liquid separator, a buffer tank and an oil-water separator which are sequentially communicated, and an outlet of the oil-water separator is communicated with a liquid return port of the liquid storage tank; the separation regulating valves are arranged in front of and behind the bypass of the solid-liquid separator, the bypass of the solid-liquid separator is connected with the cleaning liquid direct current loop in parallel, and the cleaning liquid direct current loop is provided with the direct current loop regulating valve.
In the above technical scheme, the object to be cleaned bypass comprises a plurality of object to be cleaned branches connected in parallel, and each object to be cleaned branch comprises an object to be cleaned and cleaning regulating valves arranged in front of and behind the object to be cleaned.
The beneficial effects of the invention are as follows:
the invention provides an industrial chemical cleaning dynamic simulation verification evaluation method, which comprises the steps of constructing a chemical cleaning dynamic simulation verification experiment device, designing different cleaning processes and comparing cleaning effects of different cleaning agents under the same working condition; or testing the performance of the same cleaning agent under different working conditions to determine the optimal working condition; the on-line monitoring of the type and concentration of the cleaning agent, the flow rate of the cleaning agent process, the pressure of the process, the temperature of the process and other state parameters is realized, and the parameters such as the descaling rate, the corrosion rate and the like can be monitored or solved; the change of each state parameter can be controlled to study the influence of the type, concentration, pressure, temperature, flow and the like of the cleaning agent on the cleaning effect.
Drawings
FIG. 1 is a schematic structural diagram of an industrial chemical cleaning dynamic simulation experiment device adopted by the invention.
Wherein:
1. liquid storage tank 2 stirrer
3. Water distribution regulating valve of water distribution pipeline 4
5. Water distribution flowmeter 6 dosing box
7. Centrifugal pump branch 8 discharge port
9. Liquid return port 10 medicine inlet
11. Water inlet 12 storage tank liquid level meter
13. 14 storage tank thermometer of storage tank pressure gauge
15. Electric heater 16 dosing metering pump
17. Detection sampling port of dosing regulating valve 18
19. Sampling hand valve 20 discharging hand valve
21. Centrifugal pump outlet valve 22 outlet pressure gauge
23. Centrifugal pump 24 inlet pressure gauge
25. Inlet valve 26 series regulating valve for centrifugal pump
27. Solid-liquid separator of centrifugal pump flowmeter 28
29. Buffer tank 30 oil-water separator
31. Buffer tank liquid level gauge 32 buffer tank pressure gauge
33. Buffer tank thermometer 34 temperature sensor
35. Cleaning adjusting valve for object 36 to be cleaned
37. Main-way electromagnetic valve of separation regulating valve 38
39. Loop solenoid valve 40 cleaning fluid loop
41. Cleaning liquid direct current loop 42 direct current loop regulating valve
43. A liquid discharge hand valve.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be further described below by means of specific embodiments in combination with the accompanying drawings of the specification.
An industrial chemical cleaning dynamic simulation verification and evaluation method comprises the following steps:
calculating the dosage and water distribution amount required by preparing a certain concentration of cleaning agent
Determining the volume of the residual cleaning agent in the liquid storage tank, the density of the residual cleaning agent in the liquid storage tank, the concentration of the residual cleaning agent in the liquid storage tank, the density of the medicament in the medicament adding box, the concentration of the medicament in the medicament adding box, the distribution density, the final concentration of the cleaning agent in the liquid storage tank, the final volume of the cleaning agent in the liquid storage tank and the flow rate of the metering pump, and calculating the medicament dosage, the running time of the metering pump and the distribution amount of water;
the calculation basis of the medicine dosage and the water distribution amount is as follows:
V z ＝V s +V b +V d
wherein: v (V) s The volume of the residual cleaning agent in the liquid storage tank is shown as m 3 ；
ρ s The density of the residual cleaning agent in the liquid storage tank is kg/m 3 ；
w s Concentration of the cleaning agent left in the liquid storage tank,%;
ρ q the density of the medicament in the medicament adding box is kg/m 3 ；
w q Concentration of the medicament in the medicament adding box,%;
ρ d -water density in kg/m 3 ；
w z Final concentration of cleaning agent in the liquid storage tank,%;
V z the final volume of the cleaning agent in the liquid storage tank is shown as m 3 ；
Q b Flow rate of dosing metering pump, unit is m 3 /h；
V b -the dosage of the medicine is m 3 ；
V d The unit of the water distribution is m 3 ；
t b The running time of the metering pump is s.
In the formula, the medicine dosage and the water distribution amount are unknown, and other parameters are input to solve two equations simultaneously, so that the medicine dosage and the water distribution amount can be obtained;
meanwhile, the concentration unit can be converted according to the requirement,
the concentration conversion formula is:
z z ＝w z ％·ρ z
wherein: ρz-final density of cleaning agent in tank in kg/m 3 ；
v z Final concentration of cleaning agent in the storage tank,% (volume percent);
z z the final concentration of the cleaning agent in the storage tank is kg/m 3 (mass volume);
the mass concentration of the prepared cleaning agent is 5-30%, from low to high, between 5-30%, several groups are selected for experiments, and after the optimal agent concentration is determined, the cleaning agent is prepared in the simulation verification device.
(ii) configuring a cleaning agent
(a) Opening a dosing regulating valve between the dosing tank and the dosing metering pump and between the dosing metering pump and the liquid storage tank, controlling the dosing metering pump to be opened, stopping dosing automatically when the expected dosing time is reached, and closing the dosing regulating valve between the dosing tank and the dosing metering pump and between the dosing metering pump and the liquid storage tank;
(b) Opening a water distribution regulating valve of a water distribution pipeline, monitoring the reading of a water distribution flowmeter on the water distribution pipeline, closing the water distribution regulating valve on a water distribution system when the expected water distribution amount is reached, and monitoring information such as a liquid level value in a liquid storage tank;
(c) Starting the stirrer to fully mix the medicament injected into the liquid storage tank with the clean water, starting the electric heater to heat the cleaning agent in the liquid storage tank, and automatically stopping the electric heater after the cleaning agent reaches the expected temperature;
the process realizes the control and adjustment of the type, concentration and temperature of the cleaning agent;
different temperatures have influence on the descaling property, so that the heating temperature of the cleaning agent in the liquid storage tank can be preliminarily judged to be an optimal temperature value through a plurality of groups of experiments in small test, the optimal temperature is directly set when the simulation device is started, and the temperature is directly fed back by the temperature monitoring equipment;
(iii) detergent descaling test
(a) Determining a branch circuit where a measured object is located, opening cleaning regulating valves in front of and behind the branch circuit where the measured object is located, ensuring that the cleaning regulating valves of the other two branch circuits of the measured object are closed, and simultaneously opening separation regulating valves in front of and behind a bypass of the solid-liquid separator;
(b) The pumping scheme is determined through different flow demand designs, the required working condition of the centrifugal pump is further determined, and the two centrifugal pump branches and the regulating valve on the serial passage are switched on and off;
(c) Opening a discharge hand valve at a discharge port of the liquid storage tank, and completing the frequency of the centrifugal pump and the opening setting of a main-way electromagnetic valve and a loop electromagnetic valve by using software to realize the adjustment of the pressure and the flow of the cleaning agent;
(d) Starting a centrifugal pump, pumping the cleaning agent to a tested object through the centrifugal pump, enabling the cleaning agent to flow back to a liquid storage tank through a bypass of a solid-liquid separator after the cleaning agent acts on the tested object, and starting a cleaning agent descaling performance test; monitoring state parameters such as storage tank liquid level, storage tank temperature, pump outlet pipeline pressure, process flow temperature, process flow corrosion rate, cleaning agent concentration, cleaning agent pH value and the like in the experimental process;
(iv) calculating the descaling rate after the test is finished
The method for calculating the descaling rate comprises the following steps:
determining the original oil dirt mass, the residual oil dirt mass and the mass of a pipeline of the cleaned equipment, and calculating the descaling rate according to the following formula:
wherein: n-descaling rate;
M 0 -the original measured object mass in kg;
M 1 the mass of the measured object after on-site cleaning is kg;
M 2 the mass of the tested object after thorough cleaning in the laboratory is in kg.
(v) testing and calculating the corrosion performance of the cleaning agent
The corrosion effect of the cleaning agent on the tested object is measured by utilizing the homogeneous test piece;
the corrosion rate calculation method comprises the following steps:
determining the original mass of the test piece, the residual mass of the test piece, the surface area of the test piece, the experimental time and the material density of the test piece, and calculating to obtain the corrosion rates of two units according to the following formula:
wherein: y is 1 The static corrosion rate of the cleaning agent is in mm/a;
y 2 cleaning agent static corrosion rate in g/m 2 ·h；
m 0 -the original mass of the test piece, wherein the unit is g;
m 1 -the residual mass of the test piece, in g;
s-surface area of test piece in cm 2 ；
t-experimental time, the unit is h;
ρ -the density of the test piece material in g/cm 3 。
(vi) detecting the influence of the concentration of the cleaning agent, the pressure of the process flow and the temperature of the process flow on the cleaning effect under the flow rate and the flow velocity of the process flow;
(vii) measuring the cleaning effect under different cleaning agent concentrations, process flow rates, process pressure and process temperature to obtain the optimal cleaning environment.
When the field pipeline flow (or flow rate) and the pipeline inner diameter are determined or the indoor simulation pipeline flow (or flow rate) under the optimal cleaning environment is determined, the indoor simulation pipeline flow or the field pipeline flow is obtained according to a pipeline conversion formula.
The calculation formula is as follows:
wherein: d (D) x -the inside diameter of the field pipeline in m;
Q x on-site pipeline flow in m 3 /h；
v-line flow rate in m/s;
D s -indoor simulated pipeline inside diameter in m;
Q s -indoor simulated pipeline flow in m 3 /h。
The industrial chemical cleaning dynamic simulation experiment device adopted by the invention has the functions of monitoring and detecting parameters such as concentration, temperature, flow, pressure and the like in real time, calculates the proportion, the descaling rate and the corrosion rate of the cleaning agent through calculation and analysis, can convert the selection of an application pipeline, verifies whether the selection and formulation of a cleaning process are reasonable or not, and analyzes the cleaning effect of the cleaning agent.
The chemical cleaning agent evaluation static experiment mainly comprises solubility measurement, appearance measurement, stability measurement, density measurement, pH measurement, flash point measurement, freezing point measurement, viscosity measurement, corrosion rate measurement, oil removal rate measurement, descaling rate measurement, calcium and magnesium ion measurement and iron ion measurement, and the specific measurement method is as follows:
1. solubility determination: reference is made to GB/T6324.1-2004 "test method for testing organic chemical products, part 1 test for Water miscibility of liquid organic chemical products". 10mL of the sample is measured in a clean and dry colorimetric tube, 100mL of distilled water is slowly added, the plug is covered tightly, the sample is fully shaken, and the sample is left to stand until all bubbles disappear. Placing the colorimetric tube in a constant temperature device at 25+/-2 ℃, and visually observing whether the solution in the colorimetric tube is uniform or not and whether sediment exists or not under natural light after 30 min.
2. Appearance measurement: reference is made to JB/T4323-2019 Water-based Metal cleaners. A50 ml sample was taken in a clean, dry beaker and visually inspected under natural light at 30cm for uniform liquid, delamination and strong irritating off-flavors.
3. Stability determination: reference is made to JB/T4323-2019 Water-based Metal cleaners. Taking 50ml of sample in a 50ml cylinder with a plug, sealing by the plug, and placing in a constant temperature water bath at 60+/-2 ℃ without an excessive cylinder at the scale of 30 ml. After 6 hours, the mixture was taken out and cooled to room temperature, and then the mixture was observed to have delamination and flocculation precipitation. And (3) placing the sample qualified in the high-temperature stability test in a refrigerator at the temperature of-5 ℃ for 24 hours, taking out, pouring the sample 5 times after the sample is restored to the room temperature, and observing whether layering exists or not and whether flocculating substances are precipitated or not.
4. Density measurement: reference is made to GB/T4472-2011 for determination of chemical product Density and relative Density. The sample was poured into a clean, dry measuring cylinder and placed in a constant temperature water bath at 20 ℃. After the temperature was constant, a clean, dry densitometer was slowly placed into the sample. After the densitometer is stable in the sample, the scale of the lower edge of the meniscus of the densitometer (except the densitometer marked with the scale of the upper edge of the reading meniscus) is read, namely the density of the sample at 20 ℃.
pH measurement: reference is made to JB/T4323-2019 Water-based Metal cleaners. The (1.00.+ -. 0.01) g sample was weighed and transferred to a 100mL volumetric flask, diluted to scale with water and shaken well. Pouring the test solution into a beaker, placing the beaker on a magnetic stirrer, immersing an electrode into the solution, starting stirring, and reading the pH value on a positioned acidometer.
6. Flash point determination: and the flash point is measured by a full-automatic closed-mouth flash point meter according to GB/T5208-2008 flash point measurement quick balance closed cup method.
7. Freezing point determination: reference is made to GB/T510-2018 "method for measuring the congealing Point of Petroleum products", which is measured by a congealing Point measuring instrument.
8. Viscosity measurement: the viscosity and flow properties of the liquid products were determined with reference to GB/T15357-2014 surfactant and detergent rotational viscometer. The measurement was carried out at room temperature with a rotary viscometer equipped with an ultra low viscosity adapter using a 0# rotor at a rotational speed of 60 rmp.
9. Corrosion rate measurement: reference is made to GB/T25147-2010 "method for testing the corrosion rate and the total corrosion amount of metals in chemical cleaning of industrial equipment" by weight. Accurately weighing the processed X65 standard test piece, completely immersing the test piece in the test piece, carrying out water bath at 50 ℃, and standing for 6h. And taking out the test piece, weighing the test piece after treatment, and calculating the corrosion rate of the test piece to the metal of the test piece through the mass loss of the test piece.
10. Oil removal rate measurement: reference is made to the determination of cleaning ability in JB/T4323-2019 Water-based Metal cleaner. And respectively taking a proper amount of on-site greasy dirt and 400-500g of cleaning agent from the beaker, and respectively placing the mixture in a water bath at 50 ℃ for constant-temperature preheating. And (5) immersing the weighed test piece into oil stain for more than 5min, taking out, and suspending and draining for 20min at room temperature. The oil-immersed and weighed test piece was suspended vertically and immersed completely in the constant temperature detergent sample, and the time was recorded immediately. After the test piece is subjected to static soaking at 50 ℃ for 60min, small-amplitude swaying and washing are carried out for 10 times, and then the test piece is subjected to swaying and washing in 500ml of normal-temperature distilled water for 10 times. Taking out the test piece, immediately drying the test piece in a constant-temperature electric heating drying oven at 70+/-2 ℃ for 30-40 min, taking out, cooling to room temperature, and weighing. The oil removal rate of the sample is expressed as the ratio of the mass of the cleaned oil stain to the dip-coating amount.
11. And (3) measuring the descaling rate: and is measured by referring to GB/T25148-2010 test method for descaling rate and cleaning rate in chemical cleaning of industrial equipment. Accurately weighing 2.00g of dried scale sample, adding 200g of cleaning agent sample, sealing, standing in a water bath at 50 ℃ for 24 hours, taking out, filtering while the sample is hot, and fully cleaning a test bottle and the scale sample by using distilled water. The residual scale sample is dried to constant weight in a constant temperature drying oven at 100-105 ℃. The scale removal rate of the cleaning agent is expressed as a percentage of the dissolved scale sample mass to the original mass of the scale sample.
12. Determination of calcium and magnesium ions-refer to GB/T15452-2009 "determination of calcium and magnesium ions in Industrial circulating Cooling Water EDTA titration
Calcium ion measurement: taking 10ml of water sample to be measured in a test bottle by a pipette, putting the water sample into a conical flask, adding 40ml of distilled water, adding 10ml of 10% NaOH solution, and finally adding one scoop of calcium indicator; titration with EDTA standard solution was performed, and when the purple color changed to a bright blue color was used as an endpoint, the number of milliliters of EDTA consumed was recorded.
Magnesium ion measurement: taking 10ml of water sample to be measured in a test bottle by a pipette, putting the water sample into a conical flask, adding 40ml of distilled water, adding 10ml of NH4Cl-NH 3H 2O buffer solution, and finally adding one spoon of chrome black T indicator; titration with EDTA standard solution was performed, and when the purple color changed to a bright blue color was used as an endpoint, the number of milliliters of EDTA consumed was recorded.
13. Iron ion determination: reference to HJ/T345-2007 "method for determining iron in water by phenanthroline spectrophotometry
Total iron determination: immediately after sampling, acidifying the sample to pH less than 1, taking 50.0mL of uniformly mixed water sample in a 150mL conical flask during analysis, adding 1mL of (1+3) hydrochloric acid and 1mL of hydroxylamine hydrochloride solution, and heating and boiling until the volume is reduced to about 15mL so as to ensure the dissolution and reduction of all iron. If still precipitate should be removed by filtration, absorbance is measured and blank correction is performed.
Ferrous iron determination: when in sampling, 2mL of hydrochloric acid is placed in a 100mL water sample bottle with a plug, the water sample is directly filled into the sample bottle, the plug is plugged to prevent oxidization, and the sample bottle is stored until color development and measurement (preferably on-site measurement or on-site color development) are performed. When in analysis, only a proper amount of water sample is needed, the buffer solution and the phenanthroline solution are directly added, the color development is carried out for 5-10 min, the absorbance is measured at 510nm by taking water as a reference, and blank correction is carried out.
The application relates to an industrial equipment chemical cleaning quality acceptance specification, a method for testing metal corrosion rate and corrosion total amount in industrial equipment chemical cleaning, a method for testing descaling rate and cleaning rate in industrial equipment chemical cleaning, a method for testing quality of a carbon steel passive film in industrial equipment chemical cleaning, a method for testing quality of an austenitic stainless steel passive film in industrial equipment chemical cleaning, a cooling water chemical treatment standard corrosion test piece technical condition and the like, which are all executed according to national standards.
The invention relates to an industrial chemical cleaning dynamic simulation experiment device used in an evaluation method, which is shown in figure 1, and comprises a dosing tank 6, a liquid storage tank 1, a centrifugal pump bypass 7, a cleaned object bypass and a solid-liquid separator bypass which are sequentially connected to form a loop, wherein the centrifugal pump bypass 7 is communicated with a discharge port 8 of the liquid storage tank 1, the solid-liquid separator bypass is communicated with a liquid return port 9 of the liquid storage tank 1, the dosing tank 6 is communicated with a drug inlet 10 of the liquid storage tank 1, and a water inlet 11 of the liquid storage tank 1 is communicated with a water distribution pipeline 3; a cleaning liquid loop 40 is arranged between the liquid return port 9 of the liquid storage tank 1 and the outlet of the centrifugal pump bypass 7, and a loop electromagnetic valve 39 is arranged on the cleaning liquid loop 40;
a water distribution regulating valve 4 and a water distribution flowmeter 5 are arranged on the water distribution pipeline 3;
the liquid storage tank 1 is internally provided with a stirrer 2 and an electric heater 15, and the liquid storage tank 1 is also provided with a storage tank liquid level meter 12, a storage tank pressure gauge 13 and a storage tank thermometer 14;
the bottom of the liquid storage tank 1 is provided with a liquid outlet and a detection sampling port 18, the liquid outlet 1 is provided with a liquid outlet hand valve 43, the liquid in the liquid storage tank is completely emptied through the liquid outlet hand valve 43, and the detection sampling port 18 is provided with a sampling hand valve 19, so that the concentration detection of liquid in the liquid storage tank can be conveniently carried out in the experimental process; a discharge port 8 of the liquid storage tank 1 is provided with a discharge hand valve 20;
a dosing metering pump 16 is arranged between the dosing tank 6 and the dosing inlet 10 of the liquid storage tank 1, and dosing regulating valves 17 are arranged in front of and behind the dosing metering pump 16;
the centrifugal pump bypass 7 comprises two centrifugal pump branches connected in parallel, and a centrifugal pump outlet valve 21, an outlet pressure gauge 22, a centrifugal pump 23, an inlet pressure gauge 24 and a centrifugal pump inlet valve 25 are sequentially arranged on each centrifugal pump branch; a serial connection passage is arranged between the two centrifugal pump branches, one end of the serial connection passage is connected with the outlet end of the centrifugal pump on one branch, the other end of the serial connection passage is connected with the inlet end of the centrifugal pump on the other branch, and a serial connection regulating valve 26 is arranged on the serial connection passage;
a centrifugal pump flowmeter 27 and a main solenoid valve 38 are arranged between the centrifugal pump bypass 7 and the cleaned object bypass, and the main solenoid valve 38 is arranged close to the outlet of the centrifugal pump bypass 7;
the object to be cleaned bypass comprises a plurality of object to be cleaned branches connected in parallel, and each object to be cleaned branch comprises an object to be cleaned 35 and cleaning regulating valves 36 arranged in front of and behind the object to be cleaned;
a timer is further arranged on the centrifugal pump bypass 7, and a reproduction pH detector is arranged on each cleaned object branch;
the front and the rear of the bypass of the solid-liquid separator are respectively provided with a separation regulating valve 37;
the industrial chemical cleaning dynamic simulation experiment device also comprises a cleaning liquid direct current loop 41 which is arranged in parallel with the bypass of the solid-liquid separator, and a direct current loop regulating valve 42 is arranged on the cleaning liquid direct current loop 41;
the bypass of the solid-liquid separator comprises a solid-liquid separator 28, a buffer tank 29 and an oil-water separator 30 which are sequentially communicated, and the outlet of the oil-water separator 30 is communicated with the liquid return port 9 of the liquid storage tank 1; the buffer tank 29 is provided with a buffer tank level gauge 31, a buffer tank pressure gauge 32 and a buffer tank temperature gauge 33. And the bypass of the solid-liquid separator is arranged to realize the purification of the cleaning agent in the liquid storage tank and the experimental pipeline after the experiment.
The experimental device is provided with a liquid storage tank, the liquid storage tank is provided with a water distribution port and a dosing port, the water distribution port and the dosing port are respectively connected with a water distribution system and a dosing tank, and the type and concentration of cleaning agents in the liquid storage tank are adjusted by changing the type and the water distribution amount of the agents in the dosing tank and the dosing amount. The liquid storage tank is internally provided with an electric heater, a stirrer and other parts, and is provided with a sampling port and a liquid outlet, and the stirrer is used for fully mixing the medicament in the liquid storage tank with clear water to obtain different uniform-concentration cleaning agents; the electric heater is used for heating the cleaning agent to the expected temperature, so that the function of adjusting the temperature of the cleaning agent process flow is realized; the sampling port is used for detecting the concentration, density and other information of the cleaning agent in the liquid storage tank; the liquid outlet is communicated with a liquid discharge centrifugal pump, and the cleaning agent in the liquid storage tank after the experiment is conveyed to a storage pipeline; the filter is arranged at the joint of the liquid storage tank and the experimental pipeline and is used for filtering impurities in the cleaning agent.
The experimental device is provided with two experimental centrifugal pumps to pump the cleaning agent entering the experimental pipeline in a pressurizing way, and the action time of the cleaning agent on the tested object is controlled by starting and stopping the pumps. By reasonably arranging the pipelines around the two pumps, three pumping schemes of two pumps in series connection, two pumps in parallel connection and single pump operation can be realized, and the frequency of the centrifugal pump can be adjusted to change the pumping performance of the centrifugal pump. And electric regulating valves are arranged on the experiment main pipeline and the loop, and the process flow pressure and the process flow of the main pipeline cleaning agent are regulated by matching with a pump.
The experimental device is provided with three detected objects of a pipeline, a heat exchanger and a storage tank, and is provided with an oil-water solid-liquid separator to purify cleaning agents in a post-experiment liquid storage tank and an experiment pipeline.
The liquid storage tank is internally provided with a pressure gauge, a thermometer, a liquid level gauge and other instruments, and the water injection pipeline is provided with a flowmeter, and a dosing metering pump is arranged between the dosing tank and the liquid storage tank so as to realize the monitoring and control of the dosing process. And a pressure gauge, a thermometer, a flowmeter, a densimeter, a PH meter, a corrosion rate meter and other meters are arranged at the proper positions of the experimental pipeline, so that monitoring of cleaning agent state parameters in the experimental process is realized. And each pipeline is provided with a regulating valve to realize the control of the flow path of the cleaning agent.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (10)
1. A dynamic simulation verification and evaluation method for industrial chemical cleaning is characterized in that: comprising the following steps:
calculating the dosage and the water distribution amount required by the configuration of the cleaning agent;
(ii) preparing a cleaning agent;
(iii) a detergent descaling performance test;
(iv) calculating the descaling rate;
(v) testing the corrosion performance of the cleaning agent and calculating the corrosion rate;
(vi) detecting the influence of the concentration of the cleaning agent, the pressure of the process flow and the temperature of the process flow on the cleaning effect under the flow rate and the flow velocity of the process flow;
(vii) determining the cleaning effect at different cleaning agent concentrations, process flow rates, process pressure and process temperature, and determining the optimal cleaning environment.
2. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the calculation formulas of the medicine amount and the water distribution amount are as follows:
V z ＝V s +V b +V d
wherein: v (V) s The volume of the residual cleaning agent in the liquid storage tank is shown as m 3 ；
ρ s The density of the residual cleaning agent in the liquid storage tank is kg/m 3 ；
w s Concentration of the residual cleaning agent in the liquid storage tank, wherein the unit is;
ρ q the density of the medicament in the medicament adding box is kg/m 3 ；
w q The concentration of the medicament in the medicament adding box is shown in the unit of percent;
ρ d -water density in kg/m 3 ；
w z Final concentration of cleaning agent in the liquid storage tank, wherein the unit is;
V z the final volume of the cleaning agent in the liquid storage tank is shown as m 3 ；
Q b Flow rate of dosing metering pump, unit is m 3 /h；
V b -the dosage of the medicine is m 3 ；
V d The unit of the water distribution is m 3 ；
t b The running time of the metering pump is s.
3. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the specific method for the detergent descaling performance test experiment comprises the following steps:
(a) Determining a branch where a detected object is located, opening cleaning regulating valves in front of and behind the branch where the detected object is located, closing the cleaning regulating valves of the branches of the other two detected objects, and opening separation regulating valves in front of and behind a bypass of the solid-liquid separator;
(b) Determining a pumping scheme according to the flow demand, and switching the two centrifugal pump branches and the regulating valve on the serial passage;
(c) Opening a discharge hand valve at a discharge port of the liquid storage tank, and setting the frequency of the centrifugal pump and the opening of a main-way electromagnetic valve and a loop electromagnetic valve;
(d) Starting a centrifugal pump, pumping the cleaning agent to the tested object through the centrifugal pump, enabling the cleaning agent to flow back to the liquid storage tank through the bypass of the solid-liquid separator after the cleaning agent acts on the tested object, and starting the cleaning agent descaling performance test.
4. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the calculation formula of the descaling rate is as follows:
wherein: n-descaling rate;
M 0 -the original measured object mass in kg;
M 1 the mass of the measured object after on-site cleaning is kg;
M 2 the mass of the tested object after thorough cleaning in the laboratory is in kg.
5. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the corrosion rate calculation formula is as follows:
wherein: y is 1 The static corrosion rate of the cleaning agent is in mm/a;
y 2 cleaning agent static corrosion rate in g/m 2 ·h；
m 0 -the original mass of the test piece, wherein the unit is g;
m 1 -the residual mass of the test piece, in g;
s-surface area of test piece in cm 2 ；
t-experimental time, the unit is h;
ρ -the density of the test piece material in g/cm 3 。
6. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the device adopted by the evaluation method comprises a dosing tank (6), and a liquid storage tank (1), a centrifugal pump bypass (7), a cleaned object bypass and a solid-liquid separator bypass which are sequentially connected to form a loop, wherein the centrifugal pump bypass (7) is communicated with a discharge port (8) of the liquid storage tank (1), the solid-liquid separator bypass is communicated with a liquid return port (9) of the liquid storage tank (1), the dosing tank (6) is communicated with a drug inlet (10) of the liquid storage tank (1), and a water inlet (11) of the liquid storage tank (1) is communicated with a water distribution pipeline (3); a cleaning liquid loop (40) is arranged between a liquid return port (9) of the liquid storage tank (1) and an outlet of the centrifugal pump bypass (7), and a loop electromagnetic valve (39) is arranged on the cleaning liquid loop (40); a water distribution regulating valve (4) and a water distribution flowmeter (5) are arranged on the water distribution pipeline (3); a dosing metering pump (16) is arranged between the dosing box (6) and the dosing inlet (10) of the liquid storage tank (1), and dosing regulating valves (17) are arranged in front of and behind the dosing metering pump (16).
7. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the liquid storage tank is characterized in that a stirrer (2) and an electric heater (15) are arranged inside the liquid storage tank (1), a liquid outlet and a detection sampling port (18) are arranged at the bottom of the liquid storage tank (1), a sampling hand valve (19) is arranged at the detection sampling port (18), a liquid discharging hand valve (43) is arranged at the liquid outlet, and a discharging hand valve (20) is arranged at the discharging port (8) of the liquid storage tank (1); the liquid storage tank (1) is provided with a storage tank liquid level meter (12), a storage tank pressure meter (13) and a storage tank thermometer (14).
8. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the centrifugal pump bypass (7) comprises two centrifugal pump branches connected in parallel, and a centrifugal pump outlet valve (21), an outlet pressure gauge (22), a centrifugal pump (23), an inlet pressure gauge (24) and a centrifugal pump inlet valve (25) are sequentially arranged on each centrifugal pump branch; a serial connection passage is arranged between the two centrifugal pump branches, one end of the serial connection passage is connected with the outlet end of the centrifugal pump on one branch, the other end of the serial connection passage is connected with the inlet end of the centrifugal pump on the other branch, and a serial connection regulating valve (26) is arranged on the serial connection passage; a centrifugal pump flowmeter (27) and a main-way electromagnetic valve (38) are arranged between the centrifugal pump bypass (7) and the cleaned object bypass, and the main-way electromagnetic valve (38) is arranged close to an outlet of the centrifugal pump bypass (7).
9. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the bypass of the solid-liquid separator comprises a solid-liquid separator (28), a buffer tank (29) and an oil-water separator (30) which are sequentially communicated, and the outlet of the oil-water separator (30) is communicated with a liquid return port (9) of the liquid storage tank (1); the separation regulating valves (37) are arranged before and after the solid-liquid separator bypass, the solid-liquid separator bypass is connected with the cleaning liquid direct current loop (41) in parallel, and the cleaning liquid direct current loop (41) is provided with the direct current loop regulating valve (42).
10. The method for dynamically simulating, verifying and evaluating industrial chemical cleaning according to claim 1, wherein the method comprises the steps of: the object to be cleaned bypass comprises a plurality of object to be cleaned branches connected in parallel, and each object to be cleaned branch comprises an object to be cleaned (35) and cleaning regulating valves (36) arranged in front of and behind the object to be cleaned.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117732818A (en) * | 2024-02-20 | 2024-03-22 | 威海市正威机械设备股份有限公司 | System and method for cleaning reaction vessel |
| CN118500972A (en) * | 2024-04-30 | 2024-08-16 | 诺而曼环保科技（江苏）有限公司 | System and method for detecting cleaning force of hydrocarbon cleaning agent |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117732818A (en) * | 2024-02-20 | 2024-03-22 | 威海市正威机械设备股份有限公司 | System and method for cleaning reaction vessel |
| CN118500972A (en) * | 2024-04-30 | 2024-08-16 | 诺而曼环保科技（江苏）有限公司 | System and method for detecting cleaning force of hydrocarbon cleaning agent |
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