CN210569930U

CN210569930U - Energy-saving electric furnace for smelting scrap iron

Info

Publication number: CN210569930U
Application number: CN201921606150.1U
Authority: CN
Inventors: 董春彬; 陈玉顺; 陈锋
Original assignee: Yunnan Qujing Iron And Steel Group Fenghuang Iron And Steel Co Ltd
Current assignee: Yunnan Qujing Iron And Steel Group Fenghuang Iron And Steel Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-05-19
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses an energy-saving electric stove for smelting scrap iron, including furnace body and bell, the furnace body includes the carbon brick layer from inside to outside in proper order, the heat preservation, the heat-sink shell, reflection heat insulation membrane and casing, the heat-sink shell is a confined cavity, be provided with spiral water pipe in the cavity, be provided with intake pipe and inlet tube on the lateral wall on furnace body upper portion, be provided with outlet duct and steam discharge pipe on the lateral wall of lower part, the one end of intake pipe and outlet duct is passed in proper order behind casing and the reflection heat insulation membrane and is fed through with the heat-sink shell, the one end of inlet tube is passed in proper order behind casing and the reflection heat insulation membrane and is fed through with spiral water pipe's the end of intaking intercommunication, the one end of steam discharge pipe is passed in proper order behind casing and the reflection heat insulation. The utility model discloses waste heat recovery is effectual, the high-usage, and energy loss is little, and energy-conserving effect is better, has apparent economic value and social value.

Description

Energy-saving electric furnace for smelting scrap iron

Technical Field

The utility model relates to the technical field of smelting equipment, in particular to an energy-saving electric furnace for smelting scrap iron.

Background

The waste iron and steel or scrap iron refers to iron and steel waste materials (such as trimming, end cutting and the like) which can not become products in the production process of iron and steel plants and iron and steel materials in used and scrapped equipment and components, the recycling of the waste iron and steel or scrap iron and steel materials is an important part for developing economy and is also an important component of green economy, and the improvement of the utilization rate of the waste iron and steel is one of the necessary ways for the economic change from high-speed growth to high-quality development in China. The scrap iron and steel is usually smelted by using an electric furnace, the electric furnace can be divided into a resistance furnace, an induction furnace, an electric arc furnace, a plasma furnace, an electron beam furnace and the like, the electric furnace is a hot furnace for converting electric energy in the furnace into heat to heat and smelt materials in the furnace, and compared with a fuel furnace, the electric furnace has the advantages that: the furnace atmosphere is easy to control, even can be vacuumized, the heating speed of materials in the furnace is high, the heating temperature is high, the temperature is easy to control, the production process is easy to realize mechanization and automation, the labor sanitary condition is good, the heat efficiency is high, the product quality is good, the environment is protected, and the electric furnace is widely applied in industry due to the advantages.

The total amount of waste steel and iron resources generated in China is hundreds of millions of tons every year, when the electric furnace is smelted, the energy consumption is very high, the heat loss is serious, the power consumption expense is still a very large industrial cost expenditure, the development of scrap iron smelting is restricted to a certain extent, so that how to save energy is an unavoidable problem to be solved urgently in the use process of the electric furnace, the heat energy utilization rate of the electric furnace is improved, the recycling of heat energy is enhanced, and the reduction of the energy consumption is more and more emphasized by people. Therefore, it is an objective need to develop an energy-saving electric furnace for smelting scrap iron with good waste heat recovery effect, high utilization rate and small energy loss.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an energy-saving electric stove for smelting scrap iron that waste heat recovery is effectual, the utilization ratio is high, and energy loss is little.

The utility model aims to realize the purpose, which comprises a furnace body and a furnace cover, wherein the furnace body comprises a carbon brick layer and a heat preservation layer from inside to outside in sequence, the heat absorption layer is a closed cavity, a spiral water pipe is arranged in the cavity, an air inlet pipe and a water inlet pipe are arranged on the side wall of the upper portion of the furnace body, an air outlet pipe and a steam discharge pipe are arranged on the side wall of the lower portion, one end of the air inlet pipe and one end of the air outlet pipe sequentially penetrate through the shell and the reflection heat insulation film and then are communicated with the heat absorption layer, one end of the water inlet pipe sequentially penetrates through the shell and the reflection heat insulation film and then is communicated with the water inlet end of the spiral water pipe, one end of the steam discharge pipe sequentially penetrates through the shell and the reflection heat insulation film and then is communicated with the steam discharge pipe of the spiral water pipe, a groove is machined in the upper end of the.

Further, the upper portion of furnace body is provided with out the tobacco pipe, the outside of going out the tobacco pipe is provided with the sleeve pipe, inside is provided with spiral heat absorption pipe, be provided with air conditioning import and steam outlet on the sleeve pipe, and the air conditioning import is located the one side of keeping away from the furnace body, steam outlet is located the one side of being close to the furnace body, the one side of keeping away from the furnace body on the spiral heat absorption pipe is provided with cold water inlet, the one side of being close to the furnace body is provided with hot water outlet, the outside of furnace body is provided with cold water storage tank and hot-water tank, through the cold water pipe intercommunication between cold water import and the cold water storage tank, be provided with.

Furthermore, a steam drum is arranged outside the furnace body, the outer end of the steam discharge pipe is communicated with the steam drum, the outer end of the water inlet pipe is communicated with the cold water storage tank, and a second water suction pump is arranged on the water inlet pipe.

Further, a vacuum layer is arranged between the reflective heat insulation film and the shell.

Furthermore, the cross section of the groove is in a trapezoid shape with a larger upper port and a smaller lower port.

Furthermore, the filling material in the heat insulation layer is polycrystalline mullite fiber.

Furthermore, the number of the air inlet pipes is not less than two, the air inlet pipes are evenly distributed on the circumference of the furnace body, and the air inlet direction of each air inlet pipe is tangent to the furnace body.

The utility model takes the carbon brick material as the furnace lining, because the carbon brick has the advantages of good thermal stability, high temperature resistance, high refractoriness and load softening temperature, no wetting by slag, molten iron and the like, stable high-temperature volume, good wear resistance and the like, compared with the common refractory material, the utility model can improve the continuous operation time of the electric furnace and prolong the service life, the outer side of the carbon brick material is provided with the heat preservation layer for isolating the heat from outward diffusion, the heat is gathered in the furnace body as much as possible, the outer side of the heat preservation layer is provided with the heat absorption layer, the spiral water pipe is arranged in the heat absorption layer, the spiral water pipe is internally communicated with flowing water flow, flowing air flow is communicated in the heat absorption layer space outside the spiral water pipe, after the heat passes through the heat preservation layer to be transmitted to the heat absorption layer, the heat is absorbed by the water flow and the air flow simultaneously, the heat emitted by the furnace body is effectively utilized, the energy waste is prevented, can effectually shield the outside heat radiation in the inside of heat-sink shell with the heat radiation, further reduce, to sum up, the utility model discloses both can guarantee the interior thermal gathering of stove, can improve the stove internal temperature fast when the scrap iron is smelted, can fully absorb again and give off the outside heat of heat preservation, the loss of the energy that significantly reduces improves the utilization ratio of energy, lowers the waste of energy. The utility model discloses waste heat recovery is effectual, the high-usage, and energy loss is little, and energy-conserving effect is better, has apparent economic value and social value.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

in the figure: 1-furnace cover, 2-carbon brick layer, 3-heat preservation layer, 4-heat absorption layer, 5-reflective heat insulation film, 6-shell, 7-spiral water pipe, 8-air inlet pipe, 9-water inlet pipe, 10-air outlet pipe, 11-steam outlet pipe, 12-groove, 13-protrusion, 14-heat-resistant sealing gasket, 15-smoke outlet pipe, 16-sleeve pipe, 17-spiral heat absorption pipe, 18-cold air inlet, 19-hot air outlet, 20-cold water storage tank, 21-hot water tank, 22-cold water pipe, 23-first water pump, 24-hot water pipe, 25-steam drum, 26-second water pump and 27-vacuum layer.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited in any way, and any changes or improvements based on the present invention are all within the protection scope of the present invention.

As shown in figure 1, the utility model comprises a furnace body and a furnace cover 1, the furnace body comprises a carbon brick layer 2, a heat preservation layer 3, a heat absorption layer 4, a reflective heat insulation film 5 and a shell 6 from inside to outside in sequence, the heat absorption layer 4 is a closed cavity, a spiral water pipe 7 is arranged in the cavity, an air inlet pipe 8 and a water inlet pipe 9 are arranged on the side wall of the upper part of the furnace body, an air outlet pipe 10 and a steam discharge pipe 11 are arranged on the side wall of the lower part, one end of the air inlet pipe 8 and one end of the air outlet pipe 10 are communicated with the heat absorption layer 4 after sequentially passing through the shell 6 and the reflective heat insulation film 5, one end of the water inlet pipe 9 is communicated with the water inlet end of the spiral water pipe 7 after sequentially passing through the shell 6 and the reflective heat insulation film 5, one end of the steam discharge pipe 11 is communicated with the air outlet end of the spiral water, a heat-resistant gasket 14 is provided between the groove 12 and the protrusion 13.

The utility model takes the carbon brick material as the furnace lining, because the carbon brick has the advantages of good thermal stability, high temperature resistance, high refractoriness and load softening temperature, no wetting by slag, molten iron and the like, stable high-temperature volume, good wear resistance and the like, compared with the common refractory material, the utility model can improve the continuous operation time of the electric furnace and prolong the service life, the heat preservation layer 3 is arranged at the outer side of the carbon brick material and is used for isolating the heat from outward diffusion, the heat is gathered in the furnace body as much as possible, the utilization rate of the heat is improved, the heat absorption layer 4 is arranged at the outer side of the heat preservation layer 3, the spiral water pipe 7 is arranged in the heat absorption layer 4, the flowing water flow is communicated in the spiral water pipe 7, the flowing air flow is communicated in the space of the heat absorption layer 7 at the outer part of the spiral water pipe 7, after the heat passes through the heat preservation layer 3 and is transmitted to the heat absorption layer, prevent the energy waste, in addition, set up reflection thermal-insulated membrane 5 in the outside of heat-sink shell 4, can effectually shield the inside of heat-sink shell 4 with heat radiation, further reduce outside heat radiation, to sum up, the utility model discloses both can guarantee the interior thermal gathering of stove, can improve the stove internal temperature fast when scrap iron is smelted, can fully absorb again and give off the heat of heat preservation 3 outsides, the loss of the energy that significantly reduces improves the utilization ratio of energy, reduces the waste of energy.

The upper portion of furnace body is provided with the play tobacco pipe 15 with the inside intercommunication of furnace body, the outside of going out tobacco pipe 15 is provided with sleeve pipe 16, inside is provided with spiral heat absorption pipe 17, be provided with air conditioning import 18 and steam outlet 19 on the sleeve pipe 16, and air conditioning import 18 is located the one side of keeping away from the furnace body, steam outlet 19 is located the one side of being close to the furnace body, the one side of keeping away from the furnace body on the spiral heat absorption pipe 17 is provided with cold water inlet, the one side of being close to the furnace body is provided with the hot water export, the outside of furnace body is provided with cold water storage tank 20 and hot-water tank 21, communicate through cold water pipe 22 between cold water import and the cold water storage tank 20, be provided with first suction pump 23 on. In the actual use process, a large amount of high-temperature flue gas generated by smelting the scrap iron is discharged from the smoke outlet pipe 15, at the moment, cold water is introduced into the spiral heat absorption pipe 17, cold air is introduced into the sleeve 16, and meanwhile, heat in the flue gas is absorbed, so that the recovery efficiency of waste heat is greatly improved, the heated gas can preheat the scrap iron, the temperature rise time of the scrap iron in a circuit is reduced, and the smelting efficiency is improved.

A steam pocket 25 is arranged outside the furnace body, the air outlet end of the steam outlet pipe 11 is communicated with the steam pocket 25, the water inlet end of the water inlet pipe 9 is communicated with the cold water storage tank 20, and a second water suction pump 26 is arranged on the water inlet pipe 9. The steam drum 25 is used for storing steam and conveying the steam to a place needing to be used, and when the steam drum is used, the second water suction pump 26 pumps water in the cold water storage tank 20 into the spiral water pipe 7, and the water is conveyed into the steam drum 25 after heat absorption and temperature rise.

A vacuum layer 27 is arranged between the reflective heat insulation film 5 and the shell 6, and the vacuum layer 27 is arranged on the inner side of the shell 6, so that heat transfer can be further reduced, heat transfer to the shell 6 is prevented, and the service life of the shell 6 is prolonged.

Preferably, the cross-sectional shape of the groove 12 is a trapezoid with a larger upper port and a smaller lower port, so that the sealing effect between the groove 12 and the protrusion 13 is better, and the heat overflow is effectively prevented.

Preferably, the filling material in the heat-insulating layer 3 is polycrystalline mullite fiber. The polycrystalline mullite fiber can be used as a heat insulating material in high-temperature thermal equipment below 1600 ℃ for a long time, so that the heat efficiency of the equipment can be obviously improved, the energy can be greatly saved, the production rate can be improved, and the product quality can be improved.

Two are no less than to the quantity of intake pipe 8, and several intake pipe 8 circumference equipartitions on the furnace body, and the direction of admitting air of every intake pipe 8 all is tangent with the furnace body. The arrangement can enable the airflow entering the heat absorption layer 4 to be in a spiral flowing state and continuously move downwards in the spiral flowing process, so that the airflow can uniformly absorb heat.

Claims

1. An energy-saving electric furnace for smelting scrap iron, which comprises a furnace body and a furnace cover (1), and is characterized in that: the furnace body comprises a carbon brick layer (2), a heat preservation layer (3), a heat absorption layer (4), a reflective heat insulation film (5) and a shell (6) from inside to outside in sequence, the heat absorption layer (4) is a closed cavity, a spiral water pipe (7) is arranged in the cavity, an air inlet pipe (8) and a water inlet pipe (9) are arranged on the side wall of the upper part of the furnace body, an air outlet pipe (10) and a steam discharge pipe (11) are arranged on the side wall of the lower part of the furnace body, one end of the air inlet pipe (8) and one end of the air outlet pipe (10) sequentially penetrate through the shell (6) and the reflective heat insulation film (5) and then are communicated with the heat absorption layer (4), one end of the water inlet pipe (9) sequentially penetrates through the shell (6) and the reflective heat insulation film (5) and then is communicated with the water inlet end of the spiral water pipe (7), one end of the steam discharge pipe (11, the furnace body is characterized in that a groove (12) is formed in the upper end of the furnace body, a protrusion (13) matched with the groove (12) is formed in the lower surface of the furnace cover (1), and a heat-resistant sealing gasket (14) is arranged between the groove (12) and the protrusion (13).

2. The energy-saving electric furnace for smelting iron scraps according to claim 1, wherein a smoke outlet pipe (15) communicated with the inside of the furnace body is arranged at the upper part of the furnace body, a sleeve (16) is arranged outside the smoke outlet pipe (15), a spiral heat absorption pipe (17) is arranged inside the smoke outlet pipe, a cold air inlet (18) and a hot air outlet (19) are arranged on the sleeve (16), the cold air inlet (18) is positioned at one side far away from the furnace body, the hot air outlet (19) is positioned at one side close to the furnace body, a cold water inlet is arranged at one side far away from the furnace body on the spiral heat absorption pipe (17), a hot water outlet is arranged at one side close to the furnace body, a cold water storage tank (20) and a hot water tank (21) are arranged at the outer side of the furnace body, the cold water inlet is communicated with the cold water storage tank (20) through the cold water pipe (22), a, the hot water outlet is communicated with the hot water tank (21) through a hot water pipe (24).

3. The energy-saving electric furnace for smelting iron scraps according to claim 2, wherein a steam drum (25) is arranged outside the furnace body, the air outlet end of the steam discharge pipe (11) is communicated with the steam drum (25), the water inlet end of the water inlet pipe (9) is communicated with the cold water storage tank (20), and a second water suction pump (26) is arranged on the water inlet pipe (9).

4. An energy-saving electric furnace for smelting iron scrap according to claim 1, characterized in that a vacuum layer (27) is provided between the reflective insulating film (5) and the housing (6).

5. The energy-saving electric furnace for melting scrap iron in accordance with claim 1, wherein the cross-sectional shape of said groove (12) is a trapezoid having a larger upper end and a smaller lower end.

6. The energy-saving electric furnace for smelting iron scraps as claimed in claim 1, wherein the filling material in the insulating layer (3) is polycrystalline mullite fiber.

7. The energy-saving electric furnace for smelting scrap iron according to claim 1, wherein the number of the air inlet pipes (8) is not less than two, the air inlet pipes (8) are evenly distributed on the circumference of the furnace body, and the air inlet direction of each air inlet pipe (8) is tangent to the furnace body.