CN114002248B - Monitoring and controlling method for sulfur dioxide consumption of float glass production line - Google Patents
Monitoring and controlling method for sulfur dioxide consumption of float glass production line Download PDFInfo
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- CN114002248B CN114002248B CN202111318974.0A CN202111318974A CN114002248B CN 114002248 B CN114002248 B CN 114002248B CN 202111318974 A CN202111318974 A CN 202111318974A CN 114002248 B CN114002248 B CN 114002248B
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 50
- 238000012544 monitoring process Methods 0.000 title claims abstract description 47
- 239000005329 float glass Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000005070 sampling Methods 0.000 claims abstract description 35
- 230000007704 transition Effects 0.000 claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 230000002452 interceptive effect Effects 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 34
- 239000011521 glass Substances 0.000 claims description 33
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 17
- 238000009826 distribution Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 230000007547 defect Effects 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 239000012670 alkaline solution Substances 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 3
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2202—Preparing specimens therefor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention provides a monitoring and controlling method for the sulfur dioxide consumption of a float glass production line, which aims at monitoring whether the sulfur dioxide consumption of the float glass production line is reasonable or not. The monitoring and controlling method for the sulfur dioxide consumption of the float glass production line comprises a sulfur dioxide sampling analysis device and a detection method for a float glass surface protection film layer; monitoring the content of sulfur dioxide in the space at the inlet of a transition roller table or an annealing kiln of a float glass production line through a sulfur dioxide sampling analysis device, and carrying out analysis on a surface protection film layer of the float glass and adjustment on the dosage of sulfur dioxide on the production line in an interactive way, so that the reasonable dosage of sulfur dioxide is controlled finally; the device is simple, convenient to operate, short in required time and easy to control.
Description
Technical Field
The invention belongs to the field of float glass manufacturing, and particularly relates to a monitoring and controlling method for sulfur dioxide consumption of a float glass production line.
Background
In the float glass production process, sulfur dioxide gas is often introduced between transition roller tables or at the inlet of an annealing furnace, and sulfur dioxide and Na on the lower surface of a glass ribbon are introduced at high temperature + The reaction produces a protective film layer of sodium sulfate or sodium sulfite which reduces the adhesionGlass lower surface defects caused by impurities such as tin slag and the like on a transition roller table and an annealing kiln roller table, such as tin scratches, lower surface attachments and the like. However, the liquid state and the gas state of sulfur dioxide are corrosive, and the excessive use can bring secondary pollution to corrode production line equipment; and the working condition environment of the tin bath can be polluted after the sulfur dioxide gas is diffused into the tin bath, so that the production quality of float glass is affected. Meanwhile, sulfur dioxide is a harmful gas, and excessive use can affect the environment, which is contrary to the energy saving and emission reduction advocated by China, and long-term excessive use can increase the pressure of the production line in the aspect of environmental protection. On the contrary, when the usage amount of sulfur dioxide gas is insufficient, the protective film formed on the lower surface of the glass is often thinner and uneven, the protective effect on the surface of the glass is insufficient, and when the glass passes through the roller, the lower surface of the glass still can be scratched by tin and other defects, and the cleaning of attachments on the surface of the glass in the later stage is also not facilitated. Therefore, the sulfur dioxide dosage should be reasonably utilized and controlled in the float glass production process.
However, on the existing domestic float glass production line, the usage amount of sulfur dioxide varies from tens to hundreds of liters per hour, and the usage amount mainly depends on the production experience of workers for many years or the lower surface defect in the production process, so that the method for monitoring and controlling whether the usage amount of sulfur dioxide is reasonably quantitative or not is lacking.
Disclosure of Invention
The invention aims to provide a monitoring, controlling and controlling method for the sulfur dioxide consumption of a float glass production line, which aims to monitor whether the sulfur dioxide consumption of the float glass production line is reasonable or not.
The invention adopts the following technical scheme for accomplishing the purposes:
the monitoring and controlling method for the sulfur dioxide consumption of the float glass production line comprises a sulfur dioxide sampling analysis device and a detection method for a float glass surface protection film layer; monitoring the content of sulfur dioxide in the space at the inlet of a transition roller table or an annealing kiln of a float glass production line through a sulfur dioxide sampling analysis device, and carrying out analysis on a surface protection film layer of the float glass and adjustment on the dosage of sulfur dioxide on the production line in an interactive way, so that the reasonable dosage of sulfur dioxide is controlled finally;
the sulfur dioxide sampling analysis device is used as a monitoring device for sulfur dioxide in a production line, and the monitoring of the content of the sulfur dioxide in the space at the entrance of a transition roller table or an annealing kiln of the float glass production line is realized by utilizing the reaction of absorbing sulfur dioxide by the contained detection liquid to generate sulfurous acid solution and reading the change of the PH value of the detection liquid by a PH meter arranged on the device;
analyzing the surface protection film layer of the float glass, and observing whether the surface protection film layer of the glass is uniformly distributed by using a scanning electron microscope; and analyzing the thickness information of the glass surface film layer by using a step instrument.
The sulfur dioxide sampling analysis device is provided with a sampling tube; the sampling tube is made of high-temperature-resistant acid-alkali-resistant stainless steel, is inserted into the space of the transition roller table or near the inlet of the annealing kiln and is connected with an air inlet pipe of the reaction kettle, and is provided with an air pump and a flow control element; a detection liquid which reacts with sulfur dioxide is placed in the reaction kettle; the lower end of the air inlet pipe is positioned in the detection liquid.
And the reaction kettle is provided with a PH meter and an air outlet.
The detection liquid is an alkaline solution which reacts with sulfur dioxide.
The detection liquid is sodium hydroxide solution or sodium carbonate solution with the mass fraction of 0.03-0.4%
The monitoring and controlling method for the sulfur dioxide consumption of the float glass production line comprises the following steps:
(1) Inserting a sampling tube into the space of the transition roller table or near the inlet of the annealing kiln, opening an air pump, pumping air at a constant flow rate of 1-5L/min, and introducing sampling gas into the detection liquid in the reaction kettle;
(2) Monitoring for 2-20min, and recording the change condition of the PH value in the monitoring time;
(3) Taking a glass sample in a monitoring time period, observing the distribution condition of a glass surface film layer by using a scanning electron microscope, and analyzing the thickness of the glass surface film layer by using a step instrument;
(4) And adjusting the sulfur dioxide inflow amount on the production line according to the distribution condition and the thickness of the film.
The step (4) comprises the following steps:
(5) Judging the distribution condition of the film layer and the thickness (t) of the film layer, if the film layer is uniformly distributed, the thickness of the film layer is 2000A is less than or equal to t and less than or equal to 4500A, keeping the prior sulfur dioxide usage amount and technological parameters unchanged, recording the change condition of sampling monitoring time and PH value of detection liquid, and judging whether the sulfur dioxide usage amount of the production line is reasonable or not by only recording the change condition of PH value of the detection liquid in a certain time period in the daily management and control process;
(6) If the film layer is uniformly distributed, the film layer thickness t is less than or equal to 2000A, the use amount of sulfur dioxide is required to be increased so as to effectively prevent the occurrence of defects on the lower surface of the glass; repeating the operations in the steps (1) - (4) again until the condition in the step (5) is realized, and recording the change condition of the PH value of the detection liquid;
(7) If the film layer is uniformly distributed, the film layer thickness t is more than or equal to 4500A, the using amount of sulfur dioxide can be reduced properly, and the operations in the steps (1) - (4) are required to be repeated again until the condition in the step (5) is realized, and the change condition of the PH value of the detection liquid is recorded;
(8) If uneven film distribution is found in the film analysis, or the usage amount of sulfur dioxide is relatively large, but a proper film thickness cannot be generated, the usage amount of sulfur dioxide and the spraying process need to be adjusted, and the operations of the steps (1) - (4) need to be repeated again.
According to the monitoring and controlling method for the sulfur dioxide consumption of the float glass production line, the sulfur dioxide consumption of the float glass production line is reasonably controlled by the application of the method, and the conditions of thinner glass lower surface protection film, uneven distribution and the like caused by insufficient sulfur dioxide consumption are reduced, so that the defects of the glass lower surface are reduced, and the quality of glass products is improved; meanwhile, secondary pollution to the production line caused by long-time excessive use of sulfur dioxide can be avoided, the production cost is reduced, and the environmental pollution is reduced. The method is simple to operate and easy to realize control, and after the method is established, whether the sulfur dioxide consumption of the production line is reasonable or not can be monitored and controlled only through the change of the PH value on the sulfur dioxide sampling and analyzing device in the daily production process.
Drawings
Fig. 1 is a block diagram of a sulfur dioxide sampling analyzer according to the present invention.
Fig. 2 is a flow chart of the monitoring and controlling method of the present invention.
In the figure: 1. 2 parts of reaction kettle, 2 parts of sampling pipe, 3 parts of air inlet pipe, 4 parts of PH meter, 5 parts of air outlet, 6 parts of air pump, 7 parts of flowmeter, 8 parts of detection liquid.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the sulfur dioxide sampling analysis device mentioned in this embodiment is provided with three through holes on a reaction kettle 1, one is an air inlet 3 for connecting a sampling tube 2, one is used for inserting a PH meter 4, and the other is an air outlet 5; the sampling tube 2 is provided with an air pump 6 and a flowmeter 7; the reaction kettle 1 is filled with detection liquid 8.
Example 1:
referring to fig. 2, a method for monitoring and controlling sulfur dioxide consumption of a float glass production line comprises the following steps:
(1) The sampling tube 2 is inserted into the space of the transition roller table, the air pump 6 is opened, the air flow rate is controlled by the flowmeter 7 to pump air at a constant flow rate of 1L/min, and the sampling gas is led into the detection liquid 8 through the air inlet 3 on the reaction kettle 1. The detection solution is 1L of sodium hydroxide solution with the mass percent of 0.05 percent, and the PH value of the detection solution is 12.1.
(2) Monitoring time is 10min, and the pH value is changed from 12.1 to 3.5 in the monitoring time.
(3) Taking a glass sample in a monitoring time period, and observing a glass surface film layer by using a scanning electron microscope, wherein the film layer is uniformly distributed; and analyzing the thickness of the glass surface film layer by using a step analyzer, wherein the thickness is 2524A.
(4) The film layer is uniformly distributed, and the thickness of the film layer is 2000A, t is less than or equal to 4500A. The prior sulfur dioxide usage amount and technological parameters are kept unchanged, the sampling monitoring time and the pH value change condition of the detection liquid 8 are recorded, and for the same production line to produce the same glass products, whether the sulfur dioxide usage amount of the production line is reasonable or not can be analyzed and judged by only recording the pH value change condition of the detection liquid in a certain time period in the daily management and control process.
Example 2:
a monitoring and controlling method for sulfur dioxide consumption of float glass production line comprises the following steps:
(1) The sampling tube 2 is inserted into the space of the transition roller table, the air pump 6 is opened, the air flow rate is controlled by the flowmeter 7 to pump air at a constant flow rate of 3L/min, and the sampling gas is led into the detection liquid 8 through the air inlet 3 on the reaction kettle 1. The detection solution is 1L of sodium hydroxide solution with the mass percentage of 0.1 percent, and the PH value of the detection solution is 12.4.
(2) Monitoring time was 7min, and pH was changed from 12.4 to 5.3 during the monitoring time.
(3) Taking a glass sample in a monitoring time period, and observing a glass surface film layer by using a scanning electron microscope, wherein the film layer is uniformly distributed; the thickness of the glass surface film layer was analyzed using a step ladder to be 1839 a.
(4) The film layer is uniformly distributed, the thickness t of the film layer is less than or equal to 2000A, and the using amount of sulfur dioxide is properly increased. Repeating the steps again until a film layer with uniform distribution and moderate thickness is obtained, and recording the pH value change condition of the detection liquid 8.
Example 3:
a monitoring and controlling method for sulfur dioxide consumption of float glass production line comprises the following steps:
(1) The sampling tube 2 is inserted into the space of the transition roller table, the air pump 6 is opened, the air flow rate is controlled by the flowmeter 7 to pump air at a constant flow rate of 5L/min, and the sampling gas is led into the detection liquid 8 through the air inlet 3 on the reaction kettle 1. The detection solution is 1L of sodium hydroxide solution with the mass percent of 0.05 percent, and the PH value of the detection solution is 12.1.
(2) The monitoring time was 5min, and the pH was changed from 12.1 to 2.6.
(3) Taking a glass sample in a monitoring time period, and observing a glass surface film layer by using a scanning electron microscope, wherein the film layer is uniformly distributed; the thickness of the glass surface film layer was analyzed by a step meter and was 5265 a.
(4) The film layer is uniformly distributed, the thickness t of the film layer is more than or equal to 4500A, and the using amount of sulfur dioxide is properly reduced. Repeating the steps again until a film layer with uniform distribution and moderate thickness is obtained, and recording the pH value change condition of the detection liquid 8.
Example 4:
a monitoring and controlling method for sulfur dioxide consumption of float glass production line comprises the following steps:
(1) The sampling tube 2 is inserted into the space of the transition roller table, the air pump 6 is opened, the air flow rate is controlled by the flowmeter 7, the air is pumped at a constant flow rate of 5L/min, the sampling gas is led into the detection liquid 8 through the air inlet 3 on the reaction kettle 1, the detection liquid is 1L of sodium hydroxide solution with the mass percent of 0.05%, and the PH value is 12.1.
(2) The monitoring time was 5min, and the pH was changed from 12.1 to 2.6.
(3) And taking a glass sample in a monitoring time period, and observing a glass surface film layer by using a scanning electron microscope, wherein the film layer is unevenly distributed.
(4) Checking the spraying process of sulfur dioxide, if the usage amount of sulfur dioxide is relatively large, but proper film distribution and film thickness cannot be generated, and adjusting the usage amount of sulfur dioxide and the spraying process is needed.
Claims (5)
1. A monitoring and controlling method for sulfur dioxide consumption of float glass production line is characterized in that: the monitoring control method comprises a sulfur dioxide sampling analysis device and a detection method of a float glass surface protection film layer; monitoring the content of sulfur dioxide in the space at the inlet of a transition roller table or an annealing kiln of a float glass production line through a sulfur dioxide sampling analysis device, and carrying out analysis on a surface protection film layer of the float glass and adjustment on the dosage of sulfur dioxide on the production line in an interactive way, so that the reasonable dosage of sulfur dioxide is controlled finally;
the sulfur dioxide sampling analysis device is used as a monitoring device for sulfur dioxide in a production line, and the monitoring of the content of the sulfur dioxide in the space at the entrance of a transition roller table or an annealing kiln of the float glass production line is realized by utilizing the reaction of absorbing sulfur dioxide by the contained detection liquid to generate sulfurous acid solution and reading the change of the PH value of the detection liquid by a PH meter arranged on the device;
analyzing the surface protection film layer of the float glass, and observing whether the surface protection film layer of the glass is uniformly distributed by using a scanning electron microscope; analyzing thickness information of the glass surface film layer by using a step instrument;
the monitoring and controlling method specifically comprises the following steps:
(1) Inserting a sampling tube into the space of the transition roller table or near the inlet of the annealing kiln, opening an air pump, pumping air at a constant flow rate of 1-5L/min, and introducing sampling gas into the detection liquid in the reaction kettle;
(2) Monitoring for 2-20min, and recording the change condition of the PH value in the monitoring time;
(3) Taking a glass sample in a monitoring time period, observing the distribution condition of a glass surface film layer by using a scanning electron microscope, and analyzing the thickness of the glass surface film layer by using a step instrument;
(4) According to the distribution condition and thickness of the film, adjusting the sulfur dioxide inlet amount on the production line;
the step (4) comprises the following steps:
(4.1) judging the distribution condition of the film layer and the thickness (t) of the film layer, if the film layer is uniformly distributed, the thickness of the film layer is 2000A is less than or equal to t is less than or equal to 4500A, the prior sulfur dioxide usage amount and technological parameters are kept unchanged, the sampling monitoring time and the pH value change condition of the detection liquid are recorded, and in the daily management and control process, whether the sulfur dioxide usage amount of the production line is reasonable can be analyzed and judged only by recording the pH value change condition of the detection liquid in a certain time period;
(4.2) if the film layer is uniformly distributed, the film layer thickness t is less than or equal to 2000A, the use amount of sulfur dioxide is required to be increased so as to effectively prevent the defects on the lower surface of the glass; repeating the operations in the steps (1) - (4) again until the condition of (4.1) is realized, and recording the change condition of the PH value of the detection liquid;
(4.3) if the film layer is uniformly distributed, the film layer thickness t is more than or equal to 4500A, reducing the using amount of sulfur dioxide in a proper amount, and repeating the operations in the steps (1) - (4) again until the condition of (4.1) is realized, and recording the change condition of the PH value of the detection liquid;
(4.4) if the film layer is unevenly distributed in the film layer analysis, the amount of sulfur dioxide used and the spraying process need to be adjusted, and the operations of the steps (1) - (4) need to be repeated again.
2. A method for monitoring and controlling sulfur dioxide usage in a float glass production line as claimed in claim 1, wherein: the sulfur dioxide sampling analysis device is provided with a sampling tube; the sampling tube is made of high-temperature-resistant acid-alkali-resistant stainless steel, is inserted into the space of the transition roller table or near the inlet of the annealing kiln and is connected with an air inlet pipe of the reaction kettle, and is provided with an air pump and a flow control element; a detection liquid which reacts with sulfur dioxide is placed in the reaction kettle; the lower end of the air inlet pipe is positioned in the detection liquid.
3. A method for monitoring and controlling sulfur dioxide usage in a float glass production line as claimed in claim 2, wherein: and the reaction kettle is provided with a PH meter and an air outlet.
4. A method for monitoring and controlling sulfur dioxide usage in a float glass production line as claimed in claim 2, wherein: the detection liquid is an alkaline solution which reacts with sulfur dioxide.
5. A method for monitoring and controlling sulfur dioxide usage in a float glass production line as claimed in claim 2, wherein: the detection liquid is sodium hydroxide solution or sodium carbonate solution with mass fraction of 0.03% -0.4%.
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