CN210570019U - Control device for melting atmosphere in electric melting furnace - Google Patents
Control device for melting atmosphere in electric melting furnace Download PDFInfo
- Publication number
- CN210570019U CN210570019U CN201920938681.4U CN201920938681U CN210570019U CN 210570019 U CN210570019 U CN 210570019U CN 201920938681 U CN201920938681 U CN 201920938681U CN 210570019 U CN210570019 U CN 210570019U
- Authority
- CN
- China
- Prior art keywords
- melting furnace
- electric melting
- pipe
- water
- electric
- 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.)
- Active
Links
Images
Abstract
The utility model discloses a controlling means of melting atmosphere in electric melting furnace stove, including electric melting furnace, the flue gas detecting element who detects flue gas concentration in the electric melting furnace, fill into the nitrogen gas supply unit of nitrogen gas and for filling into nitrogen gas refrigerated pipeline water cooling unit in to the electric melting furnace. The method has the advantages that nitrogen is filled into the electric melting furnace to be used as protective gas, so that the oxygen in the electric melting furnace is reduced, the oxidation of ferrous ions in the electric melting furnace is reduced, and the melting atmosphere of the electric melting furnace is ensured to be a reducing atmosphere; and meanwhile, the charged nitrogen is cooled by water cooling, so that the damage of the high-temperature nitrogen to the electric melting furnace is effectively prevented.
Description
Technical Field
The utility model belongs to the technical field of electric melting furnace production rock wool goods, a control device and control method of melting atmosphere in the electric melting furnace is related to, concretely relates to how to control the melting atmosphere in the electric melting furnace, make it stabilize to be reducing atmosphere, improve the performance of rock wool goods etc..
Background
The melting atmosphere in the electric melting furnace is a reducing atmosphere or an oxidizing atmosphere, and is important for the performances of the furnace body of the electric melting furnace, production line equipment, rock wool products and the like. Analysis and flue gas detection prove that when the melting atmosphere in the electric melting furnace is a reducing atmosphere, the graphite electrode can be effectively protected, and the graphite electrode is prevented from being oxidized; the electric furnace body can be protected, the service life of the furnace body is prolonged, and the cost is saved; meanwhile, the rock wool contains a proper amount of Fe2+, so that the temperature resistance, tensile strength and other properties of the rock wool fiber can be improved; but also can reduce the time of the electric melting furnace for discharging molten iron, and the operation is convenient.
SUMMERY OF THE UTILITY MODEL
The utility model aims at controlling the melting atmosphere in the electric melting furnace and stabilizing the melting atmosphere into the reducing atmosphere.
The utility model discloses the principle of control electric melting furnace interior melting atmosphere:
due to the chemical inertness of nitrogen, it is often used as a protective gas, such as: melon and fruit, food, bulb gas filling. The nitrogen gas is used to fill the granary to prevent the grains from mildewing and sprouting and to preserve for a long time. In the chemical industry, nitrogen is mainly used as protective gas, displacement gas, washing gas and safety guarantee gas. The gas is used as protective gas for processing aluminum products and aluminum profiles, rolling aluminum sheets and the like.
Because the nitrogen has inactive chemical property and is difficult to generate chemical reaction with other substances, the nitrogen is filled into the furnace body of the electric melting furnace as protective gas, thereby reducing the oxygen in the electric furnace and simultaneously reducing the oxidation of ferrous ions in the furnace.
The utility model discloses a specific technical scheme be:
a control device for melting atmosphere in an electric melting furnace comprises the electric melting furnace, a flue gas detection unit for detecting the concentration of flue gas 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 top cover of the furnace top of the electric melting furnace is provided with three hollow graphite electrodes, a cooling water channel which is coaxial and consists of an inner pipe and an outer pipe is arranged in each hollow graphite electrode, a connecting bracket for fixing the outer pipe is arranged between the outer wall of the outer pipe and the inner wall of the hollow graphite electrode, and the two ends of the inner pipe and the outer pipe are connected through annular end plates; a cooling water channel is enclosed between the outer wall of the inner pipe, the inner wall of the outer pipe and the two annular end plates; two water pipe joints are arranged on the annular end plate at one end of the cooling water channel;
the smoke 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 smoke monitoring analyzer, the smoke monitoring analyzer is arranged outside the electric melting furnace, the oxygen detection probe is fixed on a top cover of the furnace top of the electric melting furnace through a support and extends into a hearth of the electric melting furnace, and the signal end of the oxygen detection probe is connected with the smoke monitoring analyzer; the carbon dioxide detection probe is fixed on the top cover of the furnace top of the electric melting furnace through a support and extends into a hearth of the electric melting furnace, and a signal end of the carbon dioxide detection probe is connected to the flue gas monitoring analyzer;
the nitrogen supply unit comprises a nitrogen making compressor, a liquid nitrogen storage tank and a flowmeter, 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 flue gas 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 gas inlet pipeline, the main gas inlet pipeline is respectively connected with three branch inlet pipelines through four-way joints, and the three branch inlet pipelines are respectively inserted into 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, the water supply tank is arranged outside the electric melting furnace, the water pump is arranged beside the water supply tank, one end of the water pump is connected with the water supply pipe, the other end of the water supply pipe is connected with a water pipe connector, the other end of the water return pipe is connected with another water pipe connector, the other end of the water return pipe extends into the water supply tank, and the.
It is right to the utility model discloses technical scheme's preferred, cavity graphite electrode's center sets up double-deck heat-resisting steel pipe way, and nitrogen gas lets in from the nexine steel pipe, and double-deck heat-resisting steel pipe way is located the inside of inner tube.
To the utility model discloses technical scheme's preferred sets up return water valve on the wet return.
Compared with the prior art, the utility model, its beneficial effect is:
the utility model fills nitrogen into the electric melting furnace as protective gas, thereby reducing the oxygen in the electric melting furnace, reducing the oxidation of ferrous ions in the furnace, and ensuring the melting atmosphere of the electric melting furnace to be reducing atmosphere; and meanwhile, the charged nitrogen is cooled by water cooling, so that the damage of the high-temperature nitrogen to the electric melting furnace is effectively prevented.
Drawings
FIG. 1 is a schematic block diagram of a control apparatus for controlling a melting atmosphere in an electric melter.
Fig. 2 is a layout of the opening of the roof of the electric melter.
Detailed Description
The technical solution of the present invention is explained in detail below, but the scope of protection of the present invention is not limited to the embodiments.
In order to make the content of the present invention more comprehensible, the following description is further described with reference to fig. 1-2 and the detailed description.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example (b):
as shown in fig. 1, the apparatus for controlling the melting atmosphere in the electric melting furnace of the present embodiment includes an electric melting furnace, a flue gas detection unit for detecting the concentration of flue gas in the electric melting furnace, a nitrogen gas supply unit for charging nitrogen gas into the electric melting furnace, and a pipeline water cooling unit for cooling the charged nitrogen gas.
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 cooling water channel 1 which is coaxial and composed of an inner pipe and an outer pipe is arranged in each hollow graphite electrode, a connecting bracket for fixing the outer pipe is arranged between the outer wall of the outer pipe and the inner wall of the hollow graphite electrode, and two ends of the inner pipe and the outer pipe are connected through annular end plates; a cooling water channel is enclosed between the outer wall of the inner pipe, the inner wall of the outer pipe and the two annular end plates; two water pipe joints are arranged on the annular end plate at one end of the cooling water channel.
The smoke 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 smoke monitoring analyzer, the smoke monitoring analyzer is arranged outside the electric melting furnace, the oxygen detection probe is fixed on a top cover of the furnace top of the electric melting furnace through a support and extends into a hearth of the electric melting furnace, and the signal end of the oxygen detection probe is connected with the smoke monitoring analyzer; the carbon dioxide detection probe is fixed on the top cover of the furnace top of the electric melting furnace through a support and extends into a hearth of the electric melting furnace, and a signal end of the carbon dioxide detection probe is connected to the flue gas monitoring analyzer;
the nitrogen supply unit comprises a nitrogen making compressor, a liquid nitrogen storage tank and a flowmeter, 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 flue gas 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 gas inlet pipeline, the main gas inlet pipeline is respectively connected with three branch inlet pipelines through four-way joints, and the three branch inlet pipelines are respectively inserted into three hollow graphite electrodes; the flowmeter is arranged on the main air inlet pipeline;
the pipeline water-cooling unit includes water supply tank, water pump, delivery pipe, wet return and water supply valve, and outside the electric melting furnace was arranged in to water supply tank, water supply tank was arranged in to the water pump, and water pump exit linkage delivery pipe one end, a water pipe head is connected to the delivery pipe other end, and another water pipe head is connected to wet return one end, and the wet return other end stretches into water supply tank, and water supply valve sets up on the delivery pipe, sets up the return water valve on the wet return.
As shown in fig. 1, a double-layer heat-resistant steel pipe is arranged at the center of the hollow graphite electrode, nitrogen is introduced from the inner layer steel pipe, and the double-layer heat-resistant steel pipe is positioned inside the inner pipe. The cold water in the cooling water channel 1 cools the charged nitrogen gas in the process of charging the nitrogen gas, and the damage to the electric melting furnace caused by the nitrogen gas is prevented.
As shown in fig. 2, installing oxygen detection probes and carbon dioxide detection probes is put into an opening on the top cover of the top of the electric melting furnace, and 3, the oxygen and carbon dioxide concentrations in the electric melting furnace are detected; and simultaneously, a plurality of feeding holes 2 are arranged on 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 flue gas monitoring analyzer displays that 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 an opening signal to an electric valve of the liquid nitrogen storage tank;
step 3) starting the 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 a liquid nitrogen storage tank, and filling nitrogen in the liquid nitrogen storage tank into the furnace body of the electric melting furnace for a period of time;
step 5) when the flue gas monitoring analyzer displays that 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 the set value, the flue gas monitoring analyzer sends a closing signal to an electric valve of the liquid nitrogen storage tank;
step 6), closing an electric valve in the liquid nitrogen storage tank, and stopping filling nitrogen;
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.
As shown in FIG. 1, in the method for controlling the melting atmosphere in the electric melting furnace, when it is detected that the oxygen concentration exceeds a set value and/or the carbon dioxide concentration exceeds a set value, nitrogen is automatically injected into the furnace body of the electric melting furnace, so that the oxygen concentration and the carbon dioxide concentration in the furnace are reduced, and the melting atmosphere of the electric melting furnace is ensured to be a reducing atmosphere.
As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A control device for the melting atmosphere in an 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,
the top cover of the furnace top of the electric melting furnace is provided with three hollow graphite electrodes, a cooling water channel which is coaxial and consists of an inner pipe and an outer pipe is arranged in each hollow graphite electrode, a connecting bracket for fixing the outer pipe is arranged between the outer wall of the outer pipe and the inner wall of the hollow graphite electrode, and the two ends of the inner pipe and the outer pipe are connected through annular end plates; a cooling water channel is enclosed between the outer wall of the inner pipe, the inner wall of the outer pipe and the two annular end plates; two water pipe joints are arranged on the annular end plate at one end of the cooling water channel;
the smoke 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 smoke monitoring analyzer, the smoke monitoring analyzer is arranged outside the electric melting furnace, the oxygen detection probe is fixed on a top cover of the furnace top of the electric melting furnace through a support and extends into a hearth of the electric melting furnace, and the signal end of the oxygen detection probe is connected with the smoke monitoring analyzer; the carbon dioxide detection probe is fixed on the top cover of the furnace top of the electric melting furnace through a support and extends into a hearth of the electric melting furnace, and a signal end of the carbon dioxide detection probe is connected to the flue gas monitoring analyzer;
the nitrogen supply unit comprises a nitrogen making compressor, a liquid nitrogen storage tank and a flowmeter, 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 flue gas 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 gas inlet pipeline, the main gas inlet pipeline is respectively connected with three branch inlet pipelines through four-way joints, and the three branch inlet pipelines are respectively inserted into 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, the water supply tank is arranged outside the electric melting furnace, the water pump is arranged beside the water supply tank, one end of the water pump is connected with the water supply pipe, the other end of the water supply pipe is connected with a water pipe connector, the other end of the water return pipe is connected with another water pipe connector, the other end of the water return pipe extends into the water supply tank, and the.
2. The apparatus for controlling a melting atmosphere in an electric melter according to claim 1, wherein a double-layer heat-resistant steel pipe is provided in the center of the hollow graphite electrode, nitrogen gas is introduced from the inner layer steel pipe, and the double-layer heat-resistant steel pipe is provided inside the inner pipe.
3. The apparatus for controlling a melting atmosphere in an electric melter according to claim 1, wherein a return valve is provided in the return pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920938681.4U CN210570019U (en) | 2019-06-21 | 2019-06-21 | Control device for melting atmosphere in electric melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920938681.4U CN210570019U (en) | 2019-06-21 | 2019-06-21 | Control device for melting atmosphere in electric melting furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210570019U true CN210570019U (en) | 2020-05-19 |
Family
ID=70631747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920938681.4U Active CN210570019U (en) | 2019-06-21 | 2019-06-21 | Control device for melting atmosphere in electric melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210570019U (en) |
-
2019
- 2019-06-21 CN CN201920938681.4U patent/CN210570019U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102288740B (en) | Measuring probes for measuring and sampling with a metal melt | |
| US8721764B2 (en) | Method for operating a furnace and device for carrying out the method | |
| CN108006667B (en) | Hydrogen annealing furnace tail gas treatment system and treatment method thereof | |
| US10563922B2 (en) | Method and device for detecting a leakage in the area of at least one cooling device of a furnace and a furnace | |
| CN210570019U (en) | Control device for melting atmosphere in electric melting furnace | |
| CN212432282U (en) | Molten iron tank liquid level detection system | |
| CN110260670B (en) | Control device and control method for melting atmosphere in electric melting furnace | |
| CN204874630U (en) | Handle powder material's high temperature vacuum apparatus | |
| CN105331780B (en) | Low-temperature protection atmosphere degreasing annealing furnace | |
| CN109813094A (en) | A kind of alloy material multiple-effect quick baking preheating device and its application method | |
| CN108728607A (en) | A kind of LF stoves dynamic bottom blowing CO2- Ar method of refining and device | |
| CN208517458U (en) | A kind of LF furnace dynamic bottom blowing CO2- Ar purifier system | |
| CN110243755B (en) | Top corrosion test system and test method for variable wind field regulation in autoclave | |
| CN108700381A (en) | The operating method for melting refining furnace and melting refining furnace of cold iron source | |
| CN211245278U (en) | Automatic fire extinguishing device for electric heating control room of melting furnace or tin bath | |
| CN107151731A (en) | A kind of meshbeltfurnace quickly burns carbon system | |
| CN211651199U (en) | Magnesium alloy smelting furnace capable of realizing comprehensive liquid leakage detection | |
| CN103848423B (en) | Circulation closed type coal mine gob inert gas generator | |
| CN202730195U (en) | Online test tracking device for steel billet surface atmosphere inside furnace | |
| WO2008063095A1 (en) | Unit for catalytic gas nitrogenation of steels and alloys | |
| CN205420474U (en) | Low -temperature protection atmosphere degrease annealing stove | |
| CN207423371U (en) | Radiation protection cooling system in a kind of stove for infrared measurement of temperature | |
| CN105115888A (en) | Water wall and corrosion degree monitoring device thereof | |
| CN110343834A (en) | A kind of 6 heat-treatment furnace flue gas waste heat utilization device of aluminum alloy T and method | |
| CN220063306U (en) | Device for detecting circulating water leakage of oxygen lance of Kaldo furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |