CN114002248A - Monitoring and control method for sulfur dioxide consumption of float glass production line - Google Patents
Monitoring and control method for sulfur dioxide consumption of float glass production line Download PDFInfo
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- CN114002248A CN114002248A CN202111318974.0A CN202111318974A CN114002248A CN 114002248 A CN114002248 A CN 114002248A CN 202111318974 A CN202111318974 A CN 202111318974A CN 114002248 A CN114002248 A CN 114002248A
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 53
- 238000012544 monitoring process Methods 0.000 title claims abstract description 47
- 239000005329 float glass Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 35
- 230000007704 transition Effects 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 239000011521 glass Substances 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 16
- 238000009826 distribution Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 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
- 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
- 239000012085 test solution Substances 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
- 238000004134 energy conservation 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
- 230000009897 systematic effect Effects 0.000 description 1
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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 control method for the usage amount of sulfur dioxide in a float glass production line, and aims to monitor whether the usage amount of sulfur dioxide in the float glass production line is reasonable or not. A monitoring and control method for the usage amount of sulfur dioxide in a float glass production line comprises a sulfur dioxide sampling and analyzing device and a detection method for a float glass surface protection film layer; monitoring the content of sulfur dioxide in a space at a transition roller table or an inlet of an annealing kiln of a float glass production line by a sulfur dioxide sampling and analyzing device, analyzing a protective film layer on the surface of the float glass and adjusting the amount of the sulfur dioxide on the production line interactively, and finally realizing the control of reasonable amount of the sulfur dioxide; the device is simple, convenient to operate, short in required time and easy to realize management and 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 production process of float glass, sulfur dioxide gas is often introduced between transition roller tables or at the inlet of an annealing furnace, and at high temperature, the sulfur dioxide and Na on the lower surface of a glass strip+The protective film layer of sodium sulfate or sodium sulfite is generated by reaction, and the protective film can reduce the defects of the lower surface of the glass, such as tin scratches, lower surface attachments and the like, caused by impurities such as tin slag and the like attached to a transition roller table and an annealing kiln roller way. However, the liquid state and the gaseous state of the sulfur dioxide are corrosive, and the excessive use of the sulfur dioxide can bring about secondary pollution and corrode production line equipment; and the sulfur dioxide gas can pollute the working condition environment of the tin bath after diffusing into the tin bath, and the production quality of the float glass is influenced. Meanwhile, sulfur dioxide is a harmful gas, and the excessive use of sulfur dioxide can affect the environment, so that the method is contrary to the energy conservation and emission reduction which is vigorously advocated in China, and the pressure of the production line in the aspect of environmental protection is increased by long-term excessive use. On the contrary, when the usage amount of the sulfur dioxide gas is insufficient, the protective film formed on the lower surface of the glass is often thin and uneven, the protective effect on the surface of the glass is insufficient, when the glass passes through the roller, the defects of tin scratch and the like on the lower surface of the glass can be still caused, and the cleaning of attachments on the surface of the glass in the later period is not facilitated. Therefore, the amount of sulfur dioxide used should be reasonably utilized and controlled during the production process of float glass.
However, in the existing domestic float glass production line, the usage amount of sulfur dioxide varies from tens of liters to hundreds of liters per hour, and is adjusted only when workers have years of production experience or surface defects appear in the production process, so that a systematic monitoring and control method for determining whether the usage amount of sulfur dioxide is reasonable and quantitative is lacked.
Disclosure of Invention
The invention aims to provide a monitoring and control method for the usage amount of sulfur dioxide in a float glass production line, and aims to monitor whether the usage amount of the sulfur dioxide in the float glass production line is reasonable or not.
The invention adopts the following technical scheme for achieving the purpose:
a monitoring and control method for the usage amount of sulfur dioxide in a float glass production line comprises a sulfur dioxide sampling and analyzing device and a detection method for a float glass surface protection film layer; monitoring the content of sulfur dioxide in a space at a transition roller table or an inlet of an annealing kiln of a float glass production line by a sulfur dioxide sampling and analyzing device, analyzing a protective film layer on the surface of the float glass and adjusting the amount of the sulfur dioxide on the production line interactively, and finally realizing the control of reasonable amount of the sulfur dioxide;
the sulfur dioxide sampling and analyzing device is used as a monitoring device for sulfur dioxide in a production line, the reaction that sulfur dioxide is absorbed by contained detection liquid to generate a sulfurous acid solution is utilized, and the change of the PH value of the detection liquid is read through a PH meter arranged on the device, so that the monitoring of the content of the sulfur dioxide in the space at the inlet of a transition roller table or an annealing kiln of a float glass production line is realized;
analyzing the surface protective film layer of the float glass, and observing whether the distribution of the surface protective film layer of the glass is uniform or not by using a scanning electron microscope; and analyzing the thickness information of the film layer on the surface of the glass by using a step profiler.
The sulfur dioxide sampling and analyzing device is provided with a sampling pipe; the sampling pipe is made of high-temperature-resistant and acid-alkali-resistant stainless steel, is inserted into the space of the transition roller table or the position near the inlet of the annealing kiln and is connected with the air inlet pipe of the reaction kettle, and is provided with an air suction 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 a PH meter and an air outlet are arranged on the reaction kettle.
The detection liquid is an alkaline solution which reacts with sulfur dioxide.
The detection solution is sodium hydroxide solution or sodium carbonate solution with the mass fraction of 0.03-0.4%
A monitoring and control method for the usage amount of sulfur dioxide in a float glass production line comprises the following steps:
(1) inserting a sampling pipe into the space of a transition roller table or the position near the inlet of an annealing kiln, opening an air extracting pump, extracting air at a constant flow rate of 1-5L/min, and introducing sampling gas into detection liquid in a reaction kettle;
(2) monitoring for 2-20min, and recording the change condition of the pH value within the monitoring time;
(3) taking a glass sample in a monitoring time period, observing the distribution condition of a film layer on the surface of the glass by using a scanning electron microscope, and analyzing the thickness of the film layer on the surface of the glass by using a step profiler;
(4) and adjusting the sulfur dioxide introduction amount on the production line according to the distribution condition and the thickness of the film.
The step (4) comprises the following steps:
(5) the distribution condition and the thickness (t) of the film layer are judged, if the film layer is uniformly distributed, and the thickness (t) of the film layer is not less than 2000A and not more than 4500A, the existing usage amount and process parameters of sulfur dioxide are kept unchanged, the sampling monitoring time and the change condition of the pH value of the detection liquid are recorded, and whether the usage amount of the sulfur dioxide in the production line is reasonable can be analyzed and judged by recording the change condition of the 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 and the thickness t of the film layer is less than or equal to 2000A, the usage amount of sulfur dioxide needs to be increased so as to effectively prevent the generation of defects on the lower surface of the glass; repeating the operations of the steps (1) to (4) again until the situation of the step (5) is realized, and recording the change situation of the PH value of the detection solution;
(7) if the film layer is uniformly distributed and the thickness t of the film layer is larger than or equal to 4500A, reducing the usage amount of sulfur dioxide in a proper amount, repeating the steps (1) - (4) until the situation in the step (5) is realized, and recording the change situation of the pH value of the detection solution;
(8) if the film layer distribution is not uniform or the usage amount of sulfur dioxide is already large in the film layer analysis, but the appropriate film layer 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) to (4) need to be repeated again.
According to the monitoring and control method for the sulfur dioxide consumption of the float glass production line, the reasonable control of the sulfur dioxide consumption of the float glass production line is realized through the application of the method, and the conditions of thin protective film, uneven distribution and the like on the lower surface of the glass caused by insufficient sulfur dioxide consumption are reduced, so that the defects on the lower surface of the glass are reduced, and the quality of glass products is improved; meanwhile, the secondary pollution to a production line caused by the 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 whether the sulfur dioxide consumption of the production line is reasonable or not can be monitored and controlled only by the change of the pH value on the sulfur dioxide sampling analysis device in the daily production process after the method is established.
Drawings
Fig. 1 is a structural diagram of a sulfur dioxide sampling and analyzing apparatus according to the present invention.
Fig. 2 is a flow chart of monitoring management and control according to the present invention.
In the figure: 1. reaction kettle, 2, sampling pipe, 3, intake pipe, 4, PH meter, 5, gas outlet, 6, air pump, 7, flowmeter, 8, detection liquid.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, in the sulfur dioxide sampling and analyzing device mentioned in this embodiment, three through holes are provided on the reaction kettle 1, one is an air inlet 3 for connecting the sampling tube 2, one is for inserting the PH meter 4, and the other is an air outlet 5; the sampling pipe 2 is provided with an air pump 6 and a flowmeter 7; the reaction kettle 1 is filled with a detection liquid 8.
Example 1:
with reference to fig. 2, a method for monitoring and controlling the usage amount of sulfur dioxide in a float glass production line comprises the following steps:
(1) inserting the sampling pipe 2 into the space of the transition roller table, opening the air pump 6, controlling the gas flow rate by the flowmeter 7 to pump air at a constant flow rate of 1L/min, and leading the sampling gas into the detection liquid 8 through the gas inlet 3 on the reaction kettle 1. The test solution was 1L of 0.05% by weight sodium hydroxide solution, and the pH was 12.1.
(2) The monitoring time is 10min, and the pH value is changed from 12.1 to 3.5 within the monitoring time.
(3) Taking a glass sample in a monitoring time period, and observing a film layer on the surface of the glass by using a scanning electron microscope, wherein the film layer is uniformly distributed; and analyzing the thickness of the film layer on the surface of the glass by using a step profiler, wherein the thickness is 2524A.
(4) The film layer is uniformly distributed, and the thickness t of the film layer is more than or equal to 2000 ANG and less than or equal to 4500 ANG. Keep current sulfur dioxide use amount and technological parameter unchangeable to record sampling monitoring time and detect the pH value situation of liquid 8, to the same class glass product of same production line production, whether the change situation of detection liquid pH value need only be recorded in certain period of time in the daily management and control process can be to the reasonable analysis and judgment of production line sulfur dioxide's use amount.
Example 2:
a monitoring and control method for the usage amount of sulfur dioxide in a float glass production line comprises the following steps:
(1) inserting the sampling pipe 2 into the space of the transition roller table, opening the air pump 6, controlling the gas flow rate by the flowmeter 7 to pump air at a constant flow rate of 3L/min, and leading the sampling gas into the detection liquid 8 through the gas inlet 3 on the reaction kettle 1. The test solution was 1L of 0.1% by mass sodium hydroxide solution, and the pH was 12.4.
(2) The monitoring time is 7min, and the pH value is changed from 12.4 to 5.3 within the monitoring time.
(3) Taking a glass sample in a monitoring time period, and observing a film layer on the surface of the glass by using a scanning electron microscope, wherein the film layer is uniformly distributed; and analyzing the thickness of the film layer on the surface of the glass by using a step profiler, wherein the thickness is 1839A.
(4) The film layer is uniformly distributed, the thickness t of the film layer is less than or equal to 2000A, and the usage amount of sulfur dioxide is increased properly. And repeating the steps again until a film layer with uniform distribution and moderate thickness is obtained, and recording the change condition of the pH value of the detection liquid 8.
Example 3:
a monitoring and control method for the usage amount of sulfur dioxide in a float glass production line comprises the following steps:
(1) inserting the sampling pipe 2 into the space of the transition roller table, opening the air pump 6, controlling the gas flow rate by the flowmeter 7 to pump air at a constant flow rate of 5L/min, and leading the sampling gas into the detection liquid 8 through the gas inlet 3 on the reaction kettle 1. The test solution was 1L of 0.05% by weight sodium hydroxide solution, and the pH was 12.1.
(2) Monitoring for 5min, wherein the pH value is changed from 12.1 to 2.6.
(3) Taking a glass sample in a monitoring time period, and observing a film layer on the surface of the glass by using a scanning electron microscope, wherein the film layer is uniformly distributed; and analyzing the thickness of the film layer on the surface of the glass by using a step profiler, wherein the thickness is 5265A.
(4) The film layer is uniformly distributed, the thickness t of the film layer is more than or equal to 4500A, and the usage amount of sulfur dioxide is properly reduced. And repeating the steps again until a film layer with uniform distribution and moderate thickness is obtained, and recording the change condition of the pH value of the detection liquid 8.
Example 4:
a monitoring and control method for the usage amount of sulfur dioxide in a float glass production line comprises the following steps:
(1) the sampling pipe 2 is inserted into the space of the transition roller table, the air pump 6 is started, the flow rate of gas is controlled by the flow meter 7 to pump air 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 percentage of 0.05%, and the PH value is 12.1.
(2) Monitoring for 5min, wherein the pH value is changed from 12.1 to 2.6.
(3) And (3) taking a glass sample in a monitoring time period, and observing a film layer on the surface of the glass by using a scanning electron microscope, wherein the film layer is not uniformly distributed.
(4) When the spraying process of sulfur dioxide is checked, if the usage amount of sulfur dioxide is already large, but appropriate film layer distribution and film layer thickness cannot be generated, the usage amount of sulfur dioxide and the spraying process need to be adjusted.
Claims (7)
1. A monitoring and control method for the usage amount of sulfur dioxide in a float glass production line is characterized by comprising the following steps: the monitoring and control method comprises a sulfur dioxide sampling and analyzing device and a detection method of a float glass surface protective film layer; monitoring the content of sulfur dioxide in a space at a transition roller table or an inlet of an annealing kiln of a float glass production line by a sulfur dioxide sampling and analyzing device, analyzing a protective film layer on the surface of the float glass and adjusting the amount of the sulfur dioxide on the production line interactively, and finally realizing the control of reasonable amount of the sulfur dioxide;
the sulfur dioxide sampling and analyzing device is used as a monitoring device for sulfur dioxide in a production line, the reaction that sulfur dioxide is absorbed by contained detection liquid to generate a sulfurous acid solution is utilized, and the change of the PH value of the detection liquid is read through a PH meter arranged on the device, so that the monitoring of the content of the sulfur dioxide in the space at the inlet of a transition roller table or an annealing kiln of a float glass production line is realized;
analyzing the surface protective film layer of the float glass, and observing whether the distribution of the surface protective film layer of the glass is uniform or not by using a scanning electron microscope; and analyzing the thickness information of the film layer on the surface of the glass by using a step profiler.
2. The method for monitoring and controlling the amount of sulfur dioxide used in a float glass production line according to claim 1, wherein: the sulfur dioxide sampling and analyzing device is provided with a sampling pipe; the sampling pipe is made of high-temperature-resistant and acid-alkali-resistant stainless steel, is inserted into the space of the transition roller table or the position near the inlet of the annealing kiln and is connected with the air inlet pipe of the reaction kettle, and is provided with an air suction 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. The method for monitoring and controlling the amount of sulfur dioxide used in a float glass production line according to claim 2, wherein: and a PH meter and an air outlet are arranged on the reaction kettle.
4. The method for monitoring and controlling the amount of sulfur dioxide used in a float glass production line according to claim 2, wherein: the detection liquid is an alkaline solution which reacts with sulfur dioxide.
5. The method for monitoring and controlling the amount of sulfur dioxide used in a float glass production line according to claim 2, wherein: the detection liquid is sodium hydroxide solution or sodium carbonate solution with the mass fraction of 0.03-0.4%.
6. The method for monitoring and controlling the amount of sulfur dioxide used in a float glass production line according to claim 1, wherein the method comprises the following steps:
(1) inserting a sampling pipe into the space of a transition roller table or the position near the inlet of an annealing kiln, opening an air extracting pump, extracting air at a constant flow rate of 1-5L/min, and introducing sampling gas into detection liquid in a reaction kettle;
(2) monitoring for 2-20min, and recording the change condition of the pH value within the monitoring time;
(3) taking a glass sample in a monitoring time period, observing the distribution condition of a film layer on the surface of the glass by using a scanning electron microscope, and analyzing the thickness of the film layer on the surface of the glass by using a step profiler;
(4) and adjusting the sulfur dioxide introduction amount on the production line according to the distribution condition and the thickness of the film.
7. The method for monitoring and controlling the amount of sulfur dioxide used in the float glass production line according to claim 5, wherein the step (4) comprises the following steps:
(5) the distribution condition and the thickness (t) of the film layer are judged, if the film layer is uniformly distributed, and the thickness (t) of the film layer is not less than 2000A and not more than 4500A, the existing usage amount and process parameters of sulfur dioxide are kept unchanged, the sampling monitoring time and the change condition of the pH value of the detection liquid are recorded, and whether the usage amount of the sulfur dioxide in the production line is reasonable can be analyzed and judged by recording the change condition of the 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 and the thickness t of the film layer is less than or equal to 2000A, the usage amount of sulfur dioxide needs to be increased so as to effectively prevent the generation of defects on the lower surface of the glass; repeating the operations of the steps (1) to (4) again until the situation of the step (5) is realized, and recording the change situation of the PH value of the detection solution;
(7) if the film layer is uniformly distributed and the thickness t of the film layer is larger than or equal to 4500A, reducing the usage amount of sulfur dioxide in a proper amount, repeating the steps (1) - (4) until the situation in the step (5) is realized, and recording the change situation of the pH value of the detection solution;
(8) if the film layer distribution is not uniform or the usage amount of sulfur dioxide is already large in the film layer analysis, but the appropriate film layer 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) to (4) need to be repeated again.
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