CN110260670B - Control device and control method for melting atmosphere in electric melting furnace - Google Patents
Control device and control method for melting atmosphere in electric melting furnace Download PDFInfo
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- CN110260670B CN110260670B CN201910540346.3A CN201910540346A CN110260670B CN 110260670 B CN110260670 B CN 110260670B CN 201910540346 A CN201910540346 A CN 201910540346A CN 110260670 B CN110260670 B CN 110260670B
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- melting furnace
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- 238000002844 melting Methods 0.000 title claims abstract description 104
- 230000008018 melting Effects 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 155
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 76
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000001514 detection method Methods 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000001301 oxygen Substances 0.000 claims abstract description 38
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 38
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 33
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 33
- 239000000523 sample Substances 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000000779 smoke Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 30
- 238000003860 storage Methods 0.000 claims description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 24
- 239000003546 flue gas Substances 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 229910002804 graphite Inorganic materials 0.000 claims description 16
- 239000010439 graphite Substances 0.000 claims description 16
- 239000000498 cooling water Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 10
- 239000011490 mineral wool Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 101000927062 Haematobia irritans exigua Aquaporin Proteins 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 241000219112 Cucumis Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007668 thin rolling process Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
- F27D2007/063—Special atmospheres, e.g. high pressure atmospheres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0068—Regulation involving a measured inflow of a particular gas in the enclosure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a control device for a melting atmosphere in an electric melting furnace, which comprises the electric melting furnace, a smoke detection unit for detecting the smoke concentration in the electric melting furnace, a nitrogen supply unit for filling nitrogen into the electric melting furnace and a pipeline water cooling unit for cooling the filled nitrogen. The invention also discloses a control method of the melting atmosphere in the electric melting furnace, which comprises the steps of opening holes in the top cover of the electric melting furnace, putting an oxygen and carbon dioxide detection probe, detecting the concentration of oxygen and carbon dioxide in the electric melting furnace, and automatically spraying nitrogen into the electric melting furnace body when the concentration of oxygen is detected to exceed a set value, so that the concentration of oxygen in the electric melting furnace is reduced, and further ensuring that the melting atmosphere of the electric melting furnace is a reducing atmosphere.
Description
Technical Field
The invention belongs to the technical field of rock wool products produced by an electric melting furnace, relates to a control device and a control method of a melting atmosphere in the electric melting furnace, and particularly relates to how to control the melting atmosphere in the electric melting furnace to be stable into a reducing atmosphere, improve the performance of the rock wool products and the like.
Background
Whether the melting atmosphere in the electric melting furnace is a reducing atmosphere or an oxidizing atmosphere is critical to the performances of the electric melting furnace body, production line equipment, rock wool products and the like. Analysis and smoke detection prove that when the melting atmosphere in the electric melting furnace is a reducing atmosphere, the graphite electrode can be effectively protected and prevented from being oxidized; the electric furnace body can be protected, the service life of the electric furnace body can be prolonged, and the cost can be saved; meanwhile, the rock wool contains a proper amount of Fe2+, so that the performances of the rock wool fiber such as temperature resistance, tensile strength and the like can be improved; but also can reduce the time of molten iron discharge of the electric melting furnace, and is convenient to operate.
Disclosure of Invention
The purpose of the invention is to control the melting atmosphere in an electric melting furnace so as to stabilize the melting atmosphere to a reducing atmosphere.
The invention controls the principle of the melting atmosphere in the electric melting furnace
Due to the chemical inertness of nitrogen, it is often used as a shielding gas, such as: melon and fruit, food, bulb filling gas. So as to prevent certain objects from being oxidized by oxygen when being exposed to air, and the grain bin is filled with nitrogen, so that the grain is not mildewed or germinated, and can be stored for a long time. In the chemical industry, nitrogen is mainly used as a shielding gas, a replacement gas, a washing gas, and a safety guarantee gas. The gas is used as a protective gas for aluminum products, aluminum profile processing, aluminum thin rolling and the like.
Because the chemical property of the nitrogen is inactive and is difficult to chemically react with other substances, the nitrogen is filled into the electric melting furnace body to serve as a protective gas, so that the entry of oxygen in the electric furnace is reduced, and meanwhile, the oxidation of ferrous ions in the electric furnace is reduced.
The invention adopts the specific technical scheme that:
a control device for the melting atmosphere in an electric melting furnace comprises the electric melting furnace, a smoke detection unit for detecting the smoke concentration in the electric melting furnace, a nitrogen supply unit for filling nitrogen into the electric melting furnace and a pipeline water cooling unit for cooling the filled nitrogen,
three hollow graphite electrodes are arranged on the top cover of the furnace top of the electric melting furnace, a coaxial cooling water channel consisting of an inner tube and an outer tube is arranged in each hollow graphite electrode, a connecting bracket for fixing the outer tube is arranged between the outer wall of the outer tube and the inner wall of the hollow graphite electrode, and two ends of the inner tube and the outer tube are connected through annular end plates; the outer wall of the inner pipe, the inner wall of the outer pipe and the two annular end plates enclose a cooling water channel; two water pipe connectors are arranged on an annular end plate at one end of the cooling water channel;
the flue gas detection unit comprises an oxygen detection probe for detecting the concentration of oxygen in the electric melting furnace, a carbon dioxide detection probe for detecting the concentration of carbon dioxide in the electric melting furnace and a flue gas monitoring analyzer, wherein the flue gas monitoring analyzer is arranged outside the electric melting furnace, the oxygen detection probe is fixed on the top cover of the top of the electric melting furnace through a bracket and extends into the hearth of the electric melting furnace, and a signal port of the oxygen detection probe is connected with the flue gas monitoring analyzer; the carbon dioxide detection probe is fixed on the top cover of the furnace top of the electric melting furnace through the bracket, and extends into the hearth of the electric melting furnace, and a signal port of the carbon dioxide detection probe is connected with the flue gas monitoring analyzer;
the nitrogen supply unit comprises a nitrogen making compressor, a liquid nitrogen storage tank and a flowmeter, wherein the nitrogen making compressor and the liquid nitrogen storage tank are arranged outside the electric melting furnace, and an electric valve in the liquid nitrogen storage tank is electrically connected with the smoke monitoring analyzer; the output of the nitrogen making compressor is connected with the input of the liquid nitrogen storage tank through a pipeline, the output of the liquid nitrogen storage tank is connected with a main air inlet pipeline, the main air inlet pipeline is respectively connected with three branch inlet pipelines through a four-way joint, and the three branch inlet pipelines are respectively inserted into the three hollow graphite electrodes; the flowmeter is arranged on the main air inlet pipeline;
the pipeline water cooling unit comprises a water supply tank, a water pump, a water supply pipe, a return pipe and a water supply valve, wherein the water supply tank is arranged outside the electric melting furnace, the water pump is arranged beside the water supply tank, an outlet of the water pump is connected with one end of the water supply pipe, the other end of the water supply pipe is connected with one water pipe joint, one end of the return pipe is connected with the other water pipe joint, the other end of the return pipe stretches into the water supply tank, and the water supply valve is arranged on the water supply pipe.
For the optimization of the technical scheme of the invention, the center of the hollow graphite electrode is provided with a double-layer heat-resistant steel pipe, nitrogen is introduced into the inner layer steel pipe, and the double-layer heat-resistant steel pipe is positioned in the inner pipe.
For the optimization of the technical scheme of the invention, a water return valve is arranged on the water return pipe.
The method for controlling the melting atmosphere in the electric melting furnace comprises the following steps:
step 1) setting oxygen concentration and carbon dioxide set values in a flue gas monitoring analyzer;
step 2) when the oxygen concentration detected by the oxygen detection probe exceeds a set value and/or the carbon dioxide concentration detected by the carbon dioxide detection probe exceeds a set value, the flue gas monitoring analyzer sends a signal for opening an electric valve of the liquid nitrogen storage tank;
step 3) starting a water pump, opening a water supply valve on a water supply pipe and opening a water return valve on a water return pipe;
step 4), opening an electric valve in the liquid nitrogen storage tank, and filling nitrogen in the liquid nitrogen storage tank into the electric melting furnace body and filling nitrogen for a period of time;
step 5) when the oxygen concentration detected by the oxygen detection probe is equal to or lower than a set value and the carbon dioxide concentration detected by the carbon dioxide detection probe is equal to or lower than a set value, the flue gas monitoring analyzer sends a closing signal to an electric valve of the liquid nitrogen storage tank;
step 6), the electric valve in the liquid nitrogen storage tank is closed, and the nitrogen stops being filled;
and 7) closing the water pump, closing a water supply valve on the water supply pipe and closing a water return valve on the water return pipe.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, nitrogen is filled into the electric melting furnace as a protective gas, so that the entry of oxygen in the electric furnace is reduced, the oxidation of ferrous ions in the furnace is reduced, and the melting atmosphere of the electric melting furnace is ensured to be a reducing atmosphere; meanwhile, the water cooling is adopted to cool the filled nitrogen, so that the damage of high-temperature nitrogen to the electric melting furnace is effectively prevented.
Drawings
FIG. 1 is a schematic block diagram of a control apparatus for a melting atmosphere in an electric melting furnace.
FIG. 2 is a diagram of an aperture arrangement of an electric furnace roof top cover.
Detailed Description
The technical scheme of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
In order to make the contents of the present invention more comprehensible, the present invention is further described with reference to fig. 1 to 2 and the detailed description below.
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.
Examples:
as shown in fig. 1, the control device for the melting atmosphere in the electric melting furnace according to the embodiment comprises an electric melting furnace, a smoke detection unit for detecting the smoke concentration in the electric melting furnace, a nitrogen supply unit for charging nitrogen into the electric melting furnace, and a pipeline water cooling unit for cooling the charged nitrogen.
As shown in fig. 2, three hollow graphite electrodes are arranged on the top cover of the furnace top of the electric melting furnace, a coaxial cooling water channel 1 formed by an inner tube and an outer tube is arranged in each hollow graphite electrode, a connecting bracket for fixing the outer tube is arranged between the outer wall of the outer tube and the inner wall of the hollow graphite electrode, and two ends of the inner tube and the outer tube are connected through annular end plates; the outer wall of the inner pipe, the inner wall of the outer pipe and the two annular end plates enclose a cooling water channel; two water pipe joints are arranged on an annular end plate at one end of the cooling water channel.
The flue gas detection unit comprises an oxygen detection probe for detecting the concentration of oxygen in the electric melting furnace, a carbon dioxide detection probe for detecting the concentration of carbon dioxide in the electric melting furnace and a flue gas monitoring analyzer, wherein the flue gas monitoring analyzer is arranged outside the electric melting furnace, the oxygen detection probe is fixed on the top cover of the top of the electric melting furnace through a bracket and extends into the hearth of the electric melting furnace, and a signal port of the oxygen detection probe is connected with the flue gas monitoring analyzer; the carbon dioxide detection probe is fixed on the top cover of the furnace top of the electric melting furnace through the bracket, and extends into the hearth of the electric melting furnace, and a signal port of the carbon dioxide detection probe is connected with the flue gas monitoring analyzer;
the nitrogen supply unit comprises a nitrogen making compressor, a liquid nitrogen storage tank and a flowmeter, wherein the nitrogen making compressor and the liquid nitrogen storage tank are arranged outside the electric melting furnace, and an electric valve in the liquid nitrogen storage tank is electrically connected with the smoke monitoring analyzer; the output of the nitrogen making compressor is connected with the input of the liquid nitrogen storage tank through a pipeline, the output of the liquid nitrogen storage tank is connected with a main air inlet pipeline, the main air inlet pipeline is respectively connected with three branch inlet pipelines through a four-way joint, and the three branch inlet pipelines are respectively inserted into the three hollow graphite electrodes; the flowmeter is arranged on the main air inlet pipeline;
the pipeline water cooling unit comprises a water supply tank, a water pump, a water supply pipe, a water return pipe and a water supply valve, wherein the water supply tank is arranged outside the electric melting furnace, the water pump is arranged in the water supply tank, an outlet of the water pump is connected with one end of the water supply pipe, the other end of the water supply pipe is connected with one water pipe joint, one end of the water return pipe is connected with the other water pipe joint, the other end of the water return pipe stretches into the water supply tank, the water supply valve is arranged on the water supply pipe, and the water return valve is arranged on the water return pipe.
As shown in FIG. 1, a double-layer heat-resistant steel pipe is arranged in the center of the hollow graphite electrode, nitrogen is introduced into the inner steel pipe, and the double-layer heat-resistant steel pipe is positioned in the inner pipe. The cold water in the cooling water channel 1 cools the nitrogen gas during the nitrogen gas filling process, so as to prevent the nitrogen gas from damaging the electric melting furnace.
As shown in fig. 2, an opening is formed in the top cover of the electric melting furnace top, oxygen detection probes and carbon dioxide detection probes are arranged, and 3, the concentration of oxygen and carbon dioxide in the electric melting furnace is detected; meanwhile, a plurality of charging holes 2 are formed in the top cover of the top of the electric melting furnace.
The method for controlling the melting atmosphere in the electric melting furnace comprises the following steps:
step 1) setting oxygen concentration and carbon dioxide set values in a flue gas monitoring analyzer;
step 2) when the oxygen concentration detected by the oxygen detection probe exceeds a set value and/or the carbon dioxide concentration detected by the carbon dioxide detection probe exceeds a set value, the flue gas monitoring analyzer sends a signal for opening an electric valve of the liquid nitrogen storage tank;
step 3) starting a water pump, opening a water supply valve on a water supply pipe and opening a water return valve on a water return pipe;
step 4), opening an electric valve in the liquid nitrogen storage tank, and filling nitrogen in the liquid nitrogen storage tank into the electric melting furnace body and filling nitrogen for a period of time;
step 5) when the oxygen concentration detected by the oxygen detection probe is equal to or lower than a set value and the carbon dioxide concentration detected by the carbon dioxide detection probe is equal to or lower than a set value, the flue gas monitoring analyzer sends a closing signal to an electric valve of the liquid nitrogen storage tank;
step 6), the electric valve in the liquid nitrogen storage tank is closed, and the nitrogen stops being filled;
and 7) closing the water pump, closing a water supply valve on the water supply pipe and closing a water return valve on the water return pipe.
According to the control method of the melting atmosphere in the electric melting furnace shown in fig. 1, when the oxygen concentration exceeds the set value and/or the carbon dioxide concentration exceeds the set value, nitrogen is automatically sprayed into the electric melting furnace body, so that the oxygen concentration and the carbon dioxide concentration in the electric melting furnace are reduced, and the melting atmosphere of the electric melting furnace is ensured to be a reducing atmosphere.
As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. The control device of the melting atmosphere in the electric melting furnace comprises the electric melting furnace and is characterized by also comprising a smoke detection unit for detecting the smoke concentration in the electric melting furnace, a nitrogen supply unit for filling nitrogen into the electric melting furnace and a pipeline water cooling unit for cooling the filled nitrogen,
three hollow graphite electrodes are arranged on the top cover of the furnace top of the electric melting furnace, a coaxial cooling water channel consisting of an inner tube and an outer tube is arranged in each hollow graphite electrode, a connecting bracket for fixing the outer tube is arranged between the outer wall of the outer tube and the inner wall of the hollow graphite electrode, and two ends of the inner tube and the outer tube are connected through annular end plates; the outer wall of the inner pipe, the inner wall of the outer pipe and the two annular end plates enclose a cooling water channel; two water pipe connectors are arranged on an annular end plate at one end of the cooling water channel;
the flue gas detection unit comprises an oxygen detection probe for detecting the concentration of oxygen in the electric melting furnace, a carbon dioxide detection probe for detecting the concentration of carbon dioxide in the electric melting furnace and a flue gas monitoring analyzer, wherein the flue gas monitoring analyzer is arranged outside the electric melting furnace, the oxygen detection probe is fixed on the top cover of the top of the electric melting furnace through a bracket and extends into the hearth of the electric melting furnace, and a signal port of the oxygen detection probe is connected with the flue gas monitoring analyzer; the carbon dioxide detection probe is fixed on the top cover of the furnace top of the electric melting furnace through the bracket, and extends into the hearth of the electric melting furnace, and a signal port of the carbon dioxide detection probe is connected with the flue gas monitoring analyzer;
the nitrogen supply unit comprises a nitrogen making compressor, a liquid nitrogen storage tank and a flowmeter, wherein the nitrogen making compressor and the liquid nitrogen storage tank are arranged outside the electric melting furnace, and an electric valve in the liquid nitrogen storage tank is electrically connected with the smoke monitoring analyzer; the output of the nitrogen making compressor is connected with the input of the liquid nitrogen storage tank through a pipeline, the output of the liquid nitrogen storage tank is connected with a main air inlet pipeline, the main air inlet pipeline is respectively connected with three branch inlet pipelines through a four-way joint, and the three branch inlet pipelines are respectively inserted into the three hollow graphite electrodes; the flowmeter is arranged on the main air inlet pipeline;
the pipeline water cooling unit comprises a water supply tank, a water pump, a water supply pipe, a water return pipe and a water supply valve, wherein the water supply tank is arranged outside the electric melting furnace, the water pump is arranged beside the water supply tank, an outlet of the water pump is connected with one end of the water supply pipe, the other end of the water supply pipe is connected with one water pipe joint, one end of the water return pipe is connected with the other water pipe joint, the other end of the water return pipe stretches into the water supply tank, and the water supply valve is arranged on the water supply pipe;
the center of the hollow graphite electrode is provided with a double-layer heat-resistant steel pipeline, nitrogen is introduced into the inner layer steel pipe, and the double-layer heat-resistant steel pipeline is positioned in the inner pipe;
a backwater valve is arranged on the backwater pipe.
2. A method for controlling a melting atmosphere in an electric melting furnace using the apparatus of claim 1, comprising the steps of:
step 1) setting oxygen concentration and carbon dioxide set values in a flue gas monitoring analyzer;
step 2) when the oxygen concentration detected by the oxygen detection probe exceeds a set value and/or the carbon dioxide concentration detected by the carbon dioxide detection probe exceeds a set value, the flue gas monitoring analyzer sends a signal for opening an electric valve of the liquid nitrogen storage tank;
step 3) starting a water pump, opening a water supply valve on a water supply pipe and opening a water return valve on a water return pipe;
step 4), opening an electric valve in the liquid nitrogen storage tank, and filling nitrogen in the liquid nitrogen storage tank into the electric melting furnace body and filling nitrogen for a period of time;
step 5) when the oxygen concentration detected by the oxygen detection probe is equal to or lower than a set value and the carbon dioxide concentration detected by the carbon dioxide detection probe is equal to or lower than a set value, the flue gas monitoring analyzer sends a closing signal to an electric valve of the liquid nitrogen storage tank;
step 6), the electric valve in the liquid nitrogen storage tank is closed, and the nitrogen stops being filled;
and 7) closing the water pump, closing a water supply valve on the water supply pipe and closing a water return valve on the water return pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910540346.3A CN110260670B (en) | 2019-06-21 | 2019-06-21 | Control device and control method for melting atmosphere in electric melting furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910540346.3A CN110260670B (en) | 2019-06-21 | 2019-06-21 | Control device and control method for melting atmosphere in electric melting furnace |
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| CN110260670A CN110260670A (en) | 2019-09-20 |
| CN110260670B true CN110260670B (en) | 2024-03-12 |
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| CN201910540346.3A Active CN110260670B (en) | 2019-06-21 | 2019-06-21 | Control device and control method for melting atmosphere in electric melting furnace |
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| CN112479560B (en) * | 2020-12-24 | 2021-12-10 | 连云港福东正佑照明电器有限公司 | Preparation method of radiation-resistant anti-crystallization high-transmittance quartz tube for ultra-high-power light source |
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| CN105289220A (en) * | 2014-05-30 | 2016-02-03 | 宝山钢铁股份有限公司 | High-temperature reductive protective gas circulation drying system and method |
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| CN207918668U (en) * | 2018-01-24 | 2018-09-28 | 河北视窗玻璃有限公司 | Glass total oxygen kiln atmosphere control system and glass total oxygen kiln |
-
2019
- 2019-06-21 CN CN201910540346.3A patent/CN110260670B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007153670A (en) * | 2005-12-05 | 2007-06-21 | Mitsubishi Kakoki Kaisha Ltd | Apparatus and method for manufacturing reducing gas |
| CN101978078A (en) * | 2008-03-18 | 2011-02-16 | 杰富意钢铁株式会社 | Method of separating blast furnace gas |
| CN102080932A (en) * | 2010-12-02 | 2011-06-01 | 苏州中门子科技有限公司 | Gas online detection device in protective gas heat treatment furnace |
| CN105289220A (en) * | 2014-05-30 | 2016-02-03 | 宝山钢铁股份有限公司 | High-temperature reductive protective gas circulation drying system and method |
| CN107300325A (en) * | 2017-07-25 | 2017-10-27 | 江苏亨通光纤科技有限公司 | Wire drawing induction furnace fast cooling device and its cool-down method |
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| CN110260670A (en) | 2019-09-20 |
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