CN115825324A - Method for measuring oxidation rate of wet flue gas desulfurization oxidation reaction and application - Google Patents
Method for measuring oxidation rate of wet flue gas desulfurization oxidation reaction and application Download PDFInfo
- Publication number
- CN115825324A CN115825324A CN202211477091.9A CN202211477091A CN115825324A CN 115825324 A CN115825324 A CN 115825324A CN 202211477091 A CN202211477091 A CN 202211477091A CN 115825324 A CN115825324 A CN 115825324A
- Authority
- CN
- China
- Prior art keywords
- reaction
- oxidation
- measuring
- flue gas
- sulfite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Treating Waste Gases (AREA)
Abstract
The application provides a method for measuring the oxidation rate of a wet flue gas desulfurization oxidation reaction and application thereof, wherein the method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises the following steps: mixing sulfite with a reaction medium, and then reacting in an oxygen-deficient environment to obtain a reaction solution; extracting a first volume of the reaction solution at intervals of a first time in the reaction process, and measuring the concentration of sulfite in the reaction solution; and drawing a scatter diagram of the reaction time and the concentration of the sulfite in the reaction liquid, performing linear fitting, and taking the absolute value of the slope of the fitted straight line as the oxidation reaction rate. According to the method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction, the oxidation reaction rate limiting step is controlled in the oxygen diffusion process by controlling the reaction system in an oxygen-poor state, the oxidation reaction rate of sulfite is obtained by linear fitting by measuring the content of sulfite in reaction liquid at different reaction moments, and the method is simple to operate and high in feasibility.
Description
Technical Field
The application relates to the technical field of waste gas treatment, in particular to a method for measuring the oxidation rate of a wet flue gas desulfurization oxidation reaction and application thereof.
Background
SO in flue gas in limestone-gypsum wet desulphurization process 2 Limestone (CaCO) sprayed by upper nozzle of absorption tower 3 ) The slurry is trapped and falls into the bottom slurry and is oxidized under the action of blowing oxidizing air to obtain gypsum by-product (CaSO) 4 ·2H 2 O). The oxidation of the slurry is mainly a liquid phase reaction process, the reaction rate of the sulfite and the oxygen is high, and O is 2 The reaction is carried out by dissolving the mixture into liquid phase from air. Coal and limestone usually contain a small amount of Mn, fe, co, etc., and Mn is produced by dissolution 2+ 、Fe 3+ 、Co 2+ The oxygen is enriched in the absorption tower and can effectively catalyze the oxidation process, and the oxidation rate is generally influenced by O 2 The diffusion capacity in the liquid film is limited, and accurate and efficient measurement cannot be performed.
Disclosure of Invention
In view of the above, an object of the present application is to provide a method for measuring an oxidation rate of a wet flue gas desulfurization oxidation reaction, in which the oxidation rate-limiting step is controlled in an oxygen diffusion process by controlling a reaction system in an oxygen-deficient state, and the oxidation rate of sulfite is obtained by measuring the content of sulfite in a reaction solution at different reaction times and by linear fitting, and by using the measuring method, the oxidation rate under different reaction media can be obtained by replacing the reaction medium; the method is simple to operate and strong in feasibility, can be used for researching the influence of the operating condition change of the limestone-gypsum wet desulphurization process (such as process water, coal quality, limestone, concentration ratio and the like) on an oxidation system, and can also be used for researching and developing the catalyst or the pro-oxidant and other additives of the wet desulphurization oxidation system.
Another objective of the present application is to provide a method for comparing the oxidation rates of the wet flue gas desulfurization oxidation reaction in different reaction media.
In order to achieve the above object, a first embodiment of the present application provides a method for determining an oxidation rate of a wet flue gas desulfurization oxidation reaction, including:
mixing sulfite with a reaction medium, and then reacting in an oxygen-deficient environment to obtain a reaction solution;
extracting a first volume of the reaction solution at intervals of a first time in the reaction process, and measuring the concentration of sulfite in the reaction solution;
and drawing a scatter diagram of the reaction time and the concentration of the sulfite in the reaction liquid, performing linear fitting, and taking the absolute value of the slope of the fitted straight line as the oxidation reaction rate.
In some embodiments, the reaction temperature and the pH of the reaction system during the reaction are both kept constant.
In some embodiments, the reaction temperature is 40 to 50 ℃ and the pH of the reaction system during the reaction is 5 to 6, and the reaction is performed under stirring.
In some embodiments, the dissolved oxygen content of the oxygen-depleted environment is less than 1mg/L.
In some embodiments, the first time is 10-15min and the first volume is 5-10mL.
In some embodiments, the method of determining the concentration of sulfite in the reaction solution is iodometry.
In some embodiments, the reaction medium is ultrapure water or a mixed liquid comprising one or more of magnesium chloride, magnesium sulfate, calcium chloride, aluminum nitrate, sodium fluoride, soot, oil.
In some embodiments, the method for determining the oxidation rate of the wet flue gas desulfurization oxidation reaction further comprises: the temperature and pH of the sulfite and reaction medium mixture are adjusted to the desired temperature and pH, respectively, for the course of the reaction before the oxidation reaction is initiated by the introduction of air.
In order to achieve the above object, a second embodiment of the present application provides a method for comparing oxidation rates of a wet flue gas desulfurization oxidation reaction in different reaction media, comprising:
by adopting the method for measuring the oxidation rate of the oxidation reaction of the wet flue gas desulfurization, the oxidation rates of the sulfite in different reaction media are measured in sequence, and then the oxidation rates of the sulfite in different reaction media are compared.
The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction can bring the following beneficial effects: controlling the speed limiting step of the oxidation reaction in the oxygen diffusion process by controlling the reaction system in an oxygen-deficient state, measuring the content of sulfite in reaction liquid at different reaction moments, and obtaining the oxidation reaction rate of the sulfite through linear fitting; the method is simple to operate and strong in feasibility, can be used for researching the influence of the operating condition change of the limestone-gypsum wet desulphurization process (such as process water, coal quality, limestone, concentration ratio and the like) on an oxidation system, and can also be used for researching and developing the catalyst or the pro-oxidant and other additives of the wet desulphurization oxidation system.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a system for measuring an oxidation rate of a wet flue gas desulfurization oxidation reaction according to an embodiment of the present application.
FIG. 2 is a plot of the reaction time versus sulfite concentration of the reaction solution as a dotted linear fit in example 1.
FIG. 3 is a plot of the reaction time versus sulfite concentration of the reaction solution as a dotted linear fit in example 2.
FIG. 4 is a plot of the reaction time versus sulfite concentration of the reaction solution as a dotted linear fit in example 3.
FIG. 5 is a plot of the reaction time versus sulfite concentration of the reaction solution as a dotted linear fit in example 4.
FIG. 6 is a plot of the reaction time versus sulfite concentration of the reaction solution as a dotted linear fit in example 5.
Reference numerals are as follows:
1-a constant temperature stirring device; 2-temperature probe; 3-magneton; 4-automatic titrator; 5-acid/base reservoir; 6-a weighing device; 7-an electromagnetic valve; 8-pH composite electrode; 9-dissolved oxygen instrument probe; 10-dissolved oxygen meter; 11-an air pump; 12-a flow meter; 13-an aeration device; 14-reactor.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
In the application, the disclosure of a numerical range includes all values within the entire range and further sub-ranges, including the endpoints and sub-ranges given to these ranges.
In the application, raw materials, equipment and the like which are referred to, if not specifically stated, are commercially available or well-known methods; the methods involved are conventional methods unless otherwise specified.
The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises the following steps:
mixing sulfite with a reaction medium, and then reacting in an oxygen-deficient environment to obtain a reaction solution;
extracting a first volume of reaction liquid at intervals of first time in the reaction process, and measuring the concentration of sulfite in the reaction liquid;
and drawing a scatter diagram of the reaction time and the concentration of the sulfite in the reaction solution, performing linear fitting, and taking the absolute value of the slope of the fitted straight line as the oxidation reaction rate.
According to the method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction, the oxidation reaction rate limiting step is controlled in the oxygen diffusion process by controlling the reaction system in an oxygen-poor state, the oxidation reaction rate of sulfite is obtained by measuring the content of sulfite in reaction liquid at different reaction moments and linear fitting, and by adopting the measuring method, the oxidation rates under different reaction media can be obtained by replacing reaction media; the method is simple to operate and high in feasibility, can be used for researching the influence of operating conditions (such as process water, coal quality, limestone, concentration ratio and the like) of the limestone-gypsum wet desulphurization process on an oxidation system, and can also be used for researching and developing additives such as a catalyst or an auxiliary oxidant of the wet desulphurization oxidation system.
In some embodiments, the sulfite includes, but is not limited to, one or more of calcium sulfite or sodium sulfite, and the like. In some embodiments, the reaction temperature and the pH of the reaction system are both kept constant during the reaction. In the specific reaction process, the pH value of the reaction system can be controlled to be kept constant by dropwise adding hydrochloric acid or sodium hydroxide. Wherein, in some embodiments, the reaction temperature is 40-50 ℃, including but not limited to 40 ℃, 42 ℃, 45 ℃, 47 ℃ or 50 ℃, etc. In some embodiments, the pH of the reaction system during the reaction is from 5 to 6, including but not limited to 5, 5.2, 5.5, 5.7, or 6, and the like.
In some embodiments, the reaction is conducted under agitation conditions, which allows sufficient contact between the sulfite and the reaction medium for the reaction. The stirring speed can be generally between 250 and 350, and the stirring speed is constant during the reaction.
In some embodiments, the dissolved oxygen content of the oxygen-depleted environment is less than 1mg/L. By controlling the reaction system in an oxygen-deficient state, the rate-limiting step of the oxidation reaction can be controlled in the oxygen diffusion process.
In some embodiments, the first time is 10-15min, including but not limited to 10min, 12min, 14min, or 15min, etc.
In some embodiments, the first volume is 5-10mL, including but not limited to 5mL, 8mL, or 10mL, and the like.
In some embodiments, the method of determining the concentration of sulfite in the reaction solution is iodometry. Iodometry is a routine method in the art and will not be described further herein.
In some embodiments, the reaction medium is ultrapure water or a mixed liquid comprising one or more of magnesium chloride, magnesium sulfate, calcium chloride, aluminum nitrate, sodium fluoride, soot, oil. The type of the smoke is not limited, and the smoke can be smoke of a thermal power plant, for example; the kind of the oil is not limited, and one or more kinds of vegetable oil, animal oil, mineral oil, or the like may be used. The solvent of the mixed solution is water.
In some embodiments, the method for determining the oxidation rate of the wet flue gas desulfurization oxidation reaction further comprises: the temperature and pH of the mixture of sulphite and reaction medium are adjusted to the temperature and pH respectively required for the course of the reaction before starting the oxidation reaction by the introduction of air. That is, the reaction process is to adjust the pH and temperature of the mixture of sulfite and reaction medium to the target value required by the reaction process, then to blow a proper amount of air to form an oxygen-deficient environment, and to start the oxidation reaction.
It should be noted that, the method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction in the embodiment of the present application can be implemented by various reaction devices. As a possible example, the method for determining the oxidation rate of the wet flue gas desulfurization oxidation reaction in the embodiment of the present application can be implemented by the following system for determining the oxidation rate of the wet flue gas desulfurization oxidation reaction:
as shown in FIG. 1, the system for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises a constant-temperature stirring device 1, a reactor 14, an automatic titrator 4, a weighing device 6, an oxygen dissolving instrument 10 and an air pump 11. Wherein, the constant temperature stirring device 1 is provided with a temperature probe 2; the reactor 14 is arranged on the constant-temperature stirring device 1, and a temperature probe 2 is arranged in the reactor 14; the automatic titrator 4 is connected with a pH composite electrode 8, and the pH composite electrode 8 extends into the reactor 14; an acid/alkali storage 5 is arranged on the weighing device 6; the acid/alkali reservoir 5 is communicated with the reactor 14 through a first pipeline, the first pipeline is provided with an electromagnetic valve 7, and the electromagnetic valve 7 is connected with the automatic titrator 4; the dissolved oxygen instrument 10 is provided with an dissolved oxygen instrument probe 9, and the dissolved oxygen instrument probe 9 extends into the reactor 14; the air pump 11 is connected to an aeration device 13 through a second pipeline, a flow meter 12 is mounted on the second pipeline, and the aeration device 13 is arranged in a reactor 14.
Wherein, the reactor 14 is one of a beaker, a flask and a conical flask, and a magneton 3 is arranged in the reactor 14. The constant-temperature stirring device 1 is a constant-temperature magnetic stirrer, the weighing device 6 is an analytical balance, the acid/alkali storage device 5 is an acid/alkali liquid bottle, and the acid/alkali liquid bottle can be a conical bottle filled with alkali liquid or acid and the like; the aeration device 13 is a spray head, a micropore aerator and a jet aerator.
When in use, the reaction medium and the sulfite are stirred and mixed in the reactor, and the temperature probe 2, the dissolved oxygen instrument probe 9, the aeration device 13 and the pH composite electrode 8 all extend into the reactor below the liquid level of the reaction liquid. The constant temperature stirring device can realize constant temperature and constant rotating speed control, the automatic titrator can maintain the pH of the reaction system to be constant, and the dissolved oxygen meter can monitor the dissolved oxygen content of the reaction liquid. An air pump, a flowmeter and the like form an oxidizing air system, and air volume control can be realized.
It should be noted that the system for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction in the above example is mainly biased to laboratory detection equipment, and particularly to industrialization, each functional component can be replaced or improved according to actual needs.
The method for comparing the oxidation rates of the wet flue gas desulfurization oxidation reaction in different reaction media comprises the following steps: by adopting the method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction, the oxidation rates of the sulfite in different reaction media are measured in sequence, and then the oxidation rates of the sulfite in different reaction media are compared.
The measurement method and the comparison method of the present application will be described below with reference to specific examples.
The following examples of the present application were carried out in a system for measuring the oxidation rate of a wet flue gas desulfurization oxidation reaction as shown in fig. 1. The device comprises a constant-temperature stirring device 1, a reactor 14, an automatic titrator 4, a weighing device 6, an oxygen dissolving instrument 10 and an air pump 11, wherein the automatic titrator 4, the weighing device 6, the oxygen dissolving instrument 10 and the air pump 11 are all arranged on the periphery of the constant-temperature stirring device 1, and a space is reserved between the automatic titrator 4, the weighing device 6, the oxygen dissolving instrument 10 and the air pump 11. Wherein the constant temperature stirring device 1 is a constant temperature magnetic stirrer and is provided with a temperature probe 2, and the temperature probe 2 extends into the reactor 14 below the reaction liquid level; the reactor 14 is a beaker and is placed on the constant-temperature stirring device 1; the automatic titrator 4 is electrically connected with the pH composite electrode 8, and the end part of the pH composite electrode 8 extends into the armpit of the reaction liquid level of the reactor 14; the weighing device 6 is an analytical balance, and an acid/alkali storage 5 is arranged on the weighing device 6; the acid/alkali reservoir 5 is an acid/alkali liquid bottle which can be a conical bottle filled with 1mol/L sodium hydroxide solution or a conical bottle filled with 1mol/L hydrochloric acid as required, the acid/alkali reservoir 5 is communicated with the reactor 14 through a first pipeline, an electromagnetic valve 7 is arranged on the first pipeline, and the electromagnetic valve 7 is electrically connected with the automatic titrator 4; the dissolved oxygen instrument 10 is provided with a dissolved oxygen instrument probe 9, and the dissolved oxygen instrument probe 9 extends into the reactor 14 below the reaction liquid level; the air pump 11 is communicated with an aeration device 13 through a second pipeline, a flow meter 12 is arranged on the second pipeline, the aeration device 13 is arranged below the reaction liquid level in a reactor 14, and the aeration device 13 is a microporous aerator.
Example 1
The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises the following steps:
350mL of ultrapure water is filled in the reactor 14 as a reaction medium, magnetons are added, the reaction medium is controlled at a constant temperature of 45 ℃ by the constant-temperature stirring device 1 and is fully stirred at 300r/min, 2.2g of sodium sulfite is added, then the pH of the mixture of the reaction medium and the sodium sulfite is adjusted to 5.5 by 1mol/L hydrochloric acid, the air pump 11 is started to introduce air into the reaction system at a flow rate of 4L/min to start oxidation reaction, and a reaction solution is obtained. In the reaction process, the dissolved oxygen content in the reaction liquid is measured by a dissolved oxygen meter probe 9, the dissolved oxygen content is controlled to be always less than 0.5mg/L, the reaction liquid is in an oxygen-poor state, the pH of the reaction liquid is monitored, 1mol/L sodium hydroxide solution is dripped into an acid/alkali reservoir 5 to control the pH of the reaction liquid to be kept constant and always kept at 5.5, 5mL of the reaction liquid is quantitatively extracted from a reactor every 15min, and the concentration of sodium sulfite in the reaction liquid is measured by an iodometry method. A reaction time-reaction solution sulfite concentration scattergram was plotted and a linear fit was made, and as shown in fig. 2, the absolute value of the slope of the straight line after the fit was taken as the oxidation reaction rate.
As can be seen from FIG. 2, R 2 =0.97, the fitting relationship is good. The absolute value of the slope of the fitted line, i.e. the oxidation reaction rate, was 4.77 x 10 -4 mol/(L·min)。
Example 2
The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises the following steps:
preparing a mixed solution, wherein the solvent is ultrapure water, and the concentration of each component is as follows: 0.1mmol/L of aluminum nitrate, 0.5mmol/L of sodium fluoride, 0.2g/L of smoke dust of a thermal power plant and 0.05g/L of No. 0 diesel oil. Wherein, the smoke dust composition of the thermal power plant is shown in table 1.
TABLE 1 Smoke composition of thermal power plant
350mL of mixed solution is filled in a reactor 14 as a reaction medium, magnetons are added, the reaction medium is controlled at a constant temperature of 45 ℃ by a constant-temperature stirring device 1 and is fully stirred at 300r/min, 2.2g of sodium sulfite is added, then the pH of the mixture of the reaction medium and the sodium sulfite is adjusted to 5.5 by dropwise adding 1mol/L hydrochloric acid solution, an air pump 11 is started to introduce air into the reaction system at a flow rate of 4L/min to start an oxidation reaction, and a reaction solution is obtained. In the reaction process, the dissolved oxygen content in the reaction liquid is measured by a probe 9 of an oxygen dissolving instrument, the dissolved oxygen content is controlled to be always less than 0.5mg/L, the reaction liquid is in an oxygen-deficient state, the pH of the reaction liquid is monitored, 1mol/L of sodium hydroxide solution is dropwise added into an acid/alkali storage device 5 to control the pH of the reaction liquid to be kept constant, the pH is always kept at 5.5, 5mL of the reaction liquid is quantitatively extracted from a reactor every 12min, and the concentration of sulfite in the reaction liquid is measured by an iodometry method. A reaction time-reaction solution sulfite concentration scattergram was plotted and linear fitting was performed, as shown in fig. 3, with the absolute value of the slope of the straight line after fitting as the oxidation reaction rate.
As can be seen from FIG. 3, R 2 And the fitting relation is good = 0.99. The absolute value of the slope of the fitted line, i.e. the oxidation reaction rate, was 3.72 x 10 -4 mol/(L·min)。
Example 3
The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises the following steps:
preparing a mixed solution, wherein the solvent is ultrapure water, and the concentration of each component is as follows: 122g/L of magnesium chloride, 0.05g/L of magnesium sulfate, 22g/L of calcium chloride, 0.1mmol/L of aluminum nitrate, 0.5mmol/L of sodium fluoride, 0.2g/L of smoke dust of a thermal power plant and 0.05g/L of No. 0 diesel oil. The composition of the flue dust of the thermal power plant is the same as that of example 2.
350mL of mixed solution is filled in a reactor 14 as a reaction medium, magnetons are added, the reaction medium is controlled at a constant temperature of 45 ℃ by a constant-temperature stirring device 1, the mixed solution is fully stirred at 300r/min, 2.34g of calcium sulfite is added, then the pH value of the mixture of the reaction medium and the calcium sulfite is adjusted to 5.5 by dropwise adding 1mol/L hydrochloric acid solution, an air pump 11 is started to introduce air into the reaction system at a flow rate of 1L/min to start an oxidation reaction, and a reaction solution is obtained. In the reaction process, the dissolved oxygen content in the reaction liquid is measured by a probe 9 of an oxygen dissolving instrument, the dissolved oxygen content is controlled to be always less than 0.8mg/L, the reaction liquid is in an oxygen-deficient state, the pH of the reaction liquid is monitored, 1mol/L hydrochloric acid solution is dropwise added into an acid/alkali storage device 5 to control the pH of the reaction liquid to be kept constant, the pH is always kept at 5.5, 10mL of the reaction liquid is quantitatively extracted from a reactor every 10min, and the concentration of sulfite in the reaction liquid is measured by an iodometry method. A reaction time-reaction solution sulfite concentration scattergram was plotted and a linear fit was made, and as shown in fig. 4, the absolute value of the slope of the straight line after the fit was taken as the oxidation reaction rate.
As can be seen from FIG. 4, R 2 And the fitting relation is good = 0.99. The absolute value of the slope of the fitted line, i.e. the oxidation reaction rate, was 1.40 x 10 -4 mol/(L·min)。
Example 4
The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises the following steps:
preparing a mixed solution, wherein the solvent is ultrapure water, and the concentration of each component is as follows: 0.1mmol/L of aluminum nitrate, 0.5mmol/L of sodium fluoride, 0.2g/L of smoke dust of a thermal power plant and 0.05g/L of No. 0 diesel oil. The composition of the flue dust of the thermal power plant is the same as that of example 2.
350mL of mixed solution is filled in a reactor 14 as a reaction medium, magnetons are added, the reaction medium is controlled at a constant temperature of 45 ℃ by a constant-temperature stirring device 1, the mixed solution is fully stirred at 300r/min, 2.34g of calcium sulfite is added, then the pH value of the mixture of the reaction medium and the calcium sulfite is adjusted to 5.5 by dropwise adding 1mol/L hydrochloric acid solution, an air pump 11 is started to introduce air into the reaction system at a flow rate of 1L/min to start an oxidation reaction, and a reaction solution is obtained. In the reaction process, the dissolved oxygen content in the reaction liquid is measured by a probe 9 of an oxygen dissolving instrument, the dissolved oxygen content is controlled to be always less than 0.2mg/L, the reaction liquid is in an oxygen-deficient state, the pH of the reaction liquid is monitored, 1mol/L of sodium hydroxide solution is dropwise added into an acid/alkali storage device 5 to control the pH of the reaction liquid to be kept constant, the pH is always kept at 5.5, 5mL of the reaction liquid is quantitatively extracted from a reactor every 12min, and the concentration of sulfite in the reaction liquid is measured by an iodometry method. A reaction time-reaction solution sulfite concentration scattergram was plotted and a linear fit was made, and as shown in fig. 5, the absolute value of the slope of the straight line after the fit was taken as the oxidation reaction rate.
As can be seen from FIG. 5, R 2 And the fitting relation is good = 0.98. The absolute value of the slope of the fitted line, i.e. the oxidation reaction rate, was 1.21 x 10 -4 mol/(L·min)。
Example 5
The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction comprises the following steps:
preparing a mixed solution, wherein the solvent is ultrapure water, and the concentration of each component is as follows: 10.2g/L of magnesium chloride, 0.1mmol/L of aluminum nitrate, 0.5mmol/L of sodium fluoride, 0.2g/L of smoke dust of a thermal power plant and 0.05g/L of No. 0 diesel oil. The composition of the flue dust of the thermal power plant is the same as that of example 2.
350mL of mixed solution is filled in a reactor 14 as a reaction medium, magnetons are added, the reaction medium is controlled at a constant temperature of 45 ℃ by a constant-temperature stirring device 1, the mixture is fully stirred at 300r/min, 2.34g of calcium sulfite is added, then the pH value of the mixture of the reaction medium and the calcium sulfite is adjusted to 5.5 by dropwise adding 1mol/L hydrochloric acid solution, an air pump 11 is started to introduce air into the reaction system at a flow rate of 1L/min to start an oxidation reaction, and a reaction solution is obtained. In the reaction process, the dissolved oxygen content in the reaction liquid is measured by a probe 9 of an oxygen dissolving instrument, the dissolved oxygen content is controlled to be always less than 0.2mg/L, the reaction liquid is in an oxygen-deficient state, the pH of the reaction liquid is monitored, 1mol/L of sodium hydroxide solution is dropwise added into an acid/alkali storage device 5 to control the pH of the reaction liquid to be kept constant, the pH is always kept at 5.5, 5mL of the reaction liquid is quantitatively extracted from a reactor every 12min, and the concentration of sulfite in the reaction liquid is measured by an iodometry method. A plot of the reaction time-sulfite concentration of the reaction solution was plotted and a linear fit was made, as shown in fig. 6, using the absolute value of the slope of the straight line after the fit as the oxidation reaction rate.
As can be seen from FIG. 6, R 2 And the fitting relation is good = 0.99. Slope of straight line after fittingThe absolute value of (2.31 x 10) of the oxidation reaction rate -4 mol/(L·min)。
Comparing the oxidation reaction rate of the embodiment with the oxidation reaction rate of the embodiment 4, it can be seen that the fitting relationship is good when the reaction medium is replaced under the same condition, and further verifies that the method for determining the oxidation rate of the wet flue gas desulfurization oxidation reaction can be applied to the determination and comparison of the reaction rates of the sulfite in different reaction media.
Example 6
This example is substantially the same as example 5 except that: the pH value in the reaction process is 5, and the reaction temperature is 40 ℃.
Example 7
This example is substantially the same as example 5 except that: the pH value in the reaction process is 6, and the reaction temperature is 50 ℃.
In this application, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A method for measuring the oxidation rate of a wet flue gas desulfurization oxidation reaction is characterized by comprising the following steps:
mixing sulfite with a reaction medium, and then reacting in an oxygen-deficient environment to obtain a reaction solution;
extracting a first volume of the reaction solution at intervals of a first time in the reaction process, and measuring the concentration of sulfite in the reaction solution;
and drawing a scatter diagram of the reaction time and the concentration of the sulfite in the reaction liquid, performing linear fitting, and taking the absolute value of the slope of the fitted straight line as the oxidation reaction rate.
2. The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction according to claim 1, wherein the reaction temperature and the pH of the reaction system during the reaction process are kept constant.
3. The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction according to claim 2, wherein the reaction temperature is 40-50 ℃, the pH of the reaction system during the reaction is 5-6, and the reaction is carried out under stirring.
4. The method for measuring the oxidation rate of wet flue gas desulfurization oxidation reaction according to claim 1, wherein the dissolved oxygen content of the oxygen-deficient environment is less than 1mg/L.
5. The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction of claim 1, wherein the first time is 10-15min and the first volume is 5-10mL.
6. The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction according to claim 1, wherein the method for measuring the concentration of the sulfite in the reaction solution is an iodometric method.
7. The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction according to claim 1, wherein the reaction medium is ultrapure water or mixed liquid.
8. The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction of claim 7, wherein the mixed liquor comprises one or more of magnesium chloride, magnesium sulfate, calcium chloride, aluminum nitrate, sodium fluoride, soot and oil.
9. The method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction according to claim 1, further comprising: the temperature and pH of the sulfite and reaction medium mixture are adjusted to the desired temperature and pH, respectively, for the course of the reaction before the oxidation reaction is initiated by the introduction of air.
10. A method for comparing oxidation rates of a wet flue gas desulfurization oxidation reaction in different reaction media is characterized by comprising the following steps:
the method for measuring the oxidation rate of the wet flue gas desulfurization oxidation reaction according to any one of claims 1 to 9, wherein the oxidation rates of the sulfite in different reaction media are measured in sequence, and then the oxidation rates of the sulfite in different reaction media are compared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211477091.9A CN115825324A (en) | 2022-11-23 | 2022-11-23 | Method for measuring oxidation rate of wet flue gas desulfurization oxidation reaction and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211477091.9A CN115825324A (en) | 2022-11-23 | 2022-11-23 | Method for measuring oxidation rate of wet flue gas desulfurization oxidation reaction and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115825324A true CN115825324A (en) | 2023-03-21 |
Family
ID=85530819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211477091.9A Pending CN115825324A (en) | 2022-11-23 | 2022-11-23 | Method for measuring oxidation rate of wet flue gas desulfurization oxidation reaction and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115825324A (en) |
-
2022
- 2022-11-23 CN CN202211477091.9A patent/CN115825324A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103011226B (en) | A kind of preparation method of nano-calcium carbonate of coring and increment proceed step by step | |
| KR890004763A (en) | Wet Desulfurization Method for Flue Gas Treatment | |
| JP6299375B2 (en) | Carbonation treatment method for steelmaking slag | |
| JP3751340B2 (en) | Exhaust gas desulfurization method | |
| JPH0824566A (en) | Method for controlling oxidation of sulfite | |
| Márquez et al. | A review of recent chemical techniques for the determination of the volumetric mass-transfer coefficient kLa in gas—liquid reactors | |
| KR930007824A (en) | Method of improving tap water and apparatus therefor | |
| CN115825324A (en) | Method for measuring oxidation rate of wet flue gas desulfurization oxidation reaction and application | |
| CN107311216A (en) | The method that semi-dry desulphurization ash is utilized under wet fuel gas desulfurizing technology | |
| CN213275482U (en) | Mixed desulfurizer wet flue gas desulfurization performance test device | |
| CN1900713B (en) | Test method for detecting sulfite oxidation | |
| CN110237864A (en) | A kind of heterogeneous catalyst and its preparation method and application | |
| Hjuler et al. | Wet oxidation of residual product from spray absorption of sulphur dioxide | |
| WO1996014137A1 (en) | Forced oxidation system for a flue gas scrubbing apparatus | |
| JP2010510063A (en) | System and method for mixing a highly viscous liquid with a gas | |
| JPH04504102A (en) | Controlled release of desired products through controlled reactions of precursors | |
| CN117298829A (en) | Composite additive and preparation method and application thereof | |
| EP1948354B1 (en) | Aeration system and method | |
| Yoshimoto et al. | Gas-liquid interfacial area, bubble size and liquid-phase mass transfer coefficient in a three-phase external loop airlift bubble column | |
| JP3254139B2 (en) | Redox potential measurement method in flue gas desulfurization method | |
| JP3504427B2 (en) | Exhaust gas desulfurization method | |
| JP3494814B2 (en) | Method and apparatus for measuring calcium carbonate concentration in slurry | |
| Jia et al. | Preparation of ozone for simultaneous removal of SO2 and NO x with mud-phosphorus slurry | |
| JPS58219290A (en) | Method for impregnating ground with silicate grout for stabilizing ground | |
| WO2004013358A1 (en) | Method for dephosphorization of molten iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |