CN212431714U - Hybrid electric heating shaft kiln - Google Patents
Hybrid electric heating shaft kiln Download PDFInfo
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- CN212431714U CN212431714U CN202021774078.6U CN202021774078U CN212431714U CN 212431714 U CN212431714 U CN 212431714U CN 202021774078 U CN202021774078 U CN 202021774078U CN 212431714 U CN212431714 U CN 212431714U
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Abstract
The utility model relates to a hybrid electrical heating shaft kiln. According to the hybrid electric heating vertical kiln, the material to be heated in the kiln body is indirectly heated by adopting the resistance element heating system, a current loop is formed by adopting the high-temperature heat-resistant electrode system and the material to be heated, the material to be heated has a resistance value, when current passes through the material to be heated, the material to be heated is self-heated, and when the material is indirectly heated by the resistance element heating system, the resistance value of the material at a low-temperature stage can be changed to adapt to the requirement of self heating of the material, so that the comprehensive thermal efficiency of electric heating is effectively improved, and the heating efficiency and the production efficiency are improved while the material heating time is shortened.
Description
Technical Field
The utility model relates to an electric heating kiln field especially relates to a hybrid electric heating shaft kiln.
Background
The shaft furnace (kiln) is one of the furnaces for heating materials in the industries of metallurgy, chemical industry, building and the like, and the heating mode of the shaft furnace (kiln) is divided into external heating and internal heating according to the heating position of a heat source.
Among them, the external heating shaft kiln generally uses metal material for heat transfer, but the metal material is easily damaged by oxidation because it is heated and heat transferred for a long time. The heating temperature of the external heating mode is limited by the metal material of the furnace body, the maximum using temperature is generally lower (generally less than 950 ℃), and the heat efficiency of heat transfer through the furnace body is also low, so that the external heating mode shaft furnace is hardly adopted.
The internal heating shaft furnace is generally heated by gas, fuel oil, coal or coal gasification, and air or oxygen is introduced, so that the heated material has certain oxidation resistance and the pollution requirement on fuel is not high, such as a lime shaft kiln and a cement clinker shaft kiln. If the material to be heated is a material which is easily oxidized, such as an alloy, a metal material, etc., it is necessary to heat the material by other heating means (e.g., electric heating). However, the prior art does not have an internal heating type shaft furnace which can adopt an electric heating mode for heating.
In summary, the existing shaft furnaces are all internal heating type, and the heat source is mainly provided by fuel gas, fuel oil, coal or coal gasification and the like. When the shaft furnace is used for heating easily-oxidized materials, a reducing atmosphere needs to be provided in a hearth, so that the application range of the shaft furnace is greatly limited.
Based on the existing shaft furnace (kiln), the problems that the structure is complex, when the shaft furnace adopts fuel such as gas, fuel oil, coal or coal gasification to heat materials, the easily oxidized materials need to be ensured to be in a reducing atmosphere or under a vacuum condition, and a large amount of smoke generated during heating of the gas and the like takes away a large amount of heat, so that the heat efficiency is low and the environmental pollution is serious exist.
Accordingly, there is a need in the art to provide an electrically heated shaft kiln having a simple structure to solve the above-mentioned problems in the prior art.
SUMMERY OF THE UTILITY MODEL
Based on the above-mentioned problem that exists among the prior art, the utility model provides a hybrid electric heating shaft kiln.
In order to achieve the above object, the utility model provides a following scheme:
a hybrid electrically heated shaft kiln comprising: the device comprises a furnace body, a power supply system, a resistance element heating system and a high-temperature heat-resistant electrode system;
the resistance element heating system and the high-temperature heat-resistant electrode system are both arranged in the furnace body;
the power supply system is respectively connected with the resistance element heating system and the high-temperature heat-resistant electrode system;
the resistance element heating system is used for heating the material to be heated in the furnace body; the high-temperature heat-resistant electrode system and the material to be heated form a current loop, and the material to be heated has a resistance value, so that the material to be heated is self-heated after current passes through the material to be heated.
Preferably, the resistive element heating system comprises: a first resistive element heating unit and a second resistive element heating unit;
the first resistance element heating unit is attached to the first inner surface of the furnace body hearth; the second resistance element heating unit is attached to the second inner surface of the furnace body hearth; the first resistance element heating unit and the second resistance element heating unit are symmetrically arranged.
Preferably, the high temperature and heat resistant electrode system comprises: a first high temperature refractory electrode unit and a second high temperature refractory electrode unit; the first high-temperature heat-resistant electrode unit is attached to and arranged on the third inner surface of the furnace body hearth; the second high-temperature heat-resistant electrode unit is attached to and arranged on the fourth inner surface of the furnace body hearth; the first high temperature heat-resistant electrode unit and the second high temperature heat-resistant electrode unit are symmetrically arranged.
Preferably, the first resistance element heating unit, the first high temperature heat-resistant electrode unit, the second resistance element heating unit, and the second high temperature heat-resistant electrode unit are fixed in a closed loop to form a material placing space for placing a material to be heated.
Preferably, the resistive element heating system further comprises: the first high-temperature-resistant insulating lining body and the second high-temperature-resistant insulating lining body;
the first high-temperature-resistant insulating lining body wraps the first high-temperature-resistant electrode unit; the second high-temperature-resistant insulating lining body wraps the second high-temperature-resistant electrode unit; and the first high-temperature-resistant insulating lining body, the first high-temperature-resistant electrode unit, the second high-temperature-resistant insulating lining body and the second high-temperature-resistant electrode unit are fixed in a closed loop manner, so that a material placing space for placing materials to be heated is formed.
Preferably, the power supply system includes: a first power supply unit and a second power supply unit;
the first power supply unit is connected with the resistance element heating system; and the second power supply unit is connected with the high-temperature heat-resistant electrode system.
Preferably, the hybrid electrically heated shaft kiln further comprises: a protection channel;
and the power supply system is respectively connected with the resistance element heating system and the high-temperature heat-resistant electrode system through the protection channel.
Preferably, the material of the protection channel is a heat-resistant insulating material or a heat-insulating material.
Preferably, the hybrid electrically heated shaft kiln further comprises: a temperature measurement control system;
the temperature measurement control system is arranged on the outer side of the furnace body; the temperature measurement control system is used for adjusting heating electric power and heating time in real time according to the temperature of the material to be heated.
Preferably, the temperature measurement control system comprises a thermocouple, a signal transmitter and an electrical control cabinet;
the thermocouple is used for detecting the temperature of the material to be heated in the furnace body hearth; the signal transmitter is used for transmitting the temperature signal detected by the thermocouple to the electrical control cabinet; the electric control cabinet is used for setting heating temperature according to the material to be heated and setting heating electric power and heating time according to the temperature signal.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model provides a hybrid electric heating shaft kiln, carry out indirect heating through the material of waiting to heat that adopts resistive element heating system in to the furnace body, adopt high temperature resistant hot electrode system and wait to heat the material and form the electric current return circuit, it has the resistance value because of self to wait to heat the material, after the electric current is through waiting to heat the material, it carries out the self-heating to wait to heat the material, and when resistive element heating system indirect heating material, can change the resistance value at the low temperature stage material, with the requirement that adaptation material self generates heat, and then the comprehensive thermal efficiency of electric heating has been improved effectively, when shortening material heating time, heating efficiency and production efficiency have been improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic structural view of a hybrid electric heating shaft kiln provided by the present invention;
fig. 2 is a schematic structural view of a square hearth of the hybrid electric heating shaft kiln provided by the embodiment of the invention;
fig. 3 is a schematic structural view of a rectangular furnace chamber of a hybrid electric heating shaft kiln provided by an embodiment of the present invention;
fig. 4 is a schematic structural view of a circular furnace chamber of a hybrid electric heating shaft kiln provided by the embodiment of the present invention.
Description of the symbols:
the furnace comprises a furnace body shell 1, a furnace body heat preservation and insulation layer 2, a high-temperature-resistant heat preservation clapboard 3, a power supply protection lining 4, a high-temperature wear-resistant lining plate 5, a furnace body discharging system 6, a power supply system 7, a furnace body feeding system 8, a resistance element heating system 9, a first resistance element heating unit 9-1, a second resistance element heating unit 9-2, a temperature measurement control system 10, a high-temperature heat-resistant electrode system 11, a first high-temperature heat-resistant electrode unit 11-1, a second high-temperature heat-resistant electrode unit 11-2, a first high-temperature-resistant insulating lining 11-3 and a second high-temperature-resistant insulating lining 11-4.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a hybrid electrical heating shaft kiln to have the characteristics of high thermal efficiency and simple structure.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Fig. 1 is the utility model provides a structural schematic of hybrid electric heating shaft kiln, a hybrid electric heating shaft kiln, include: a furnace body (only a furnace body shell 1 is shown in fig. 1, and the specific structure thereof is not shown), a power supply system 7, a resistance element heating system 9 and a high-temperature heat-resistant electrode system 11.
The resistance element heating system 9 and the high temperature heat-resistant electrode system 11 are both arranged in the furnace body.
The power supply system 7 is respectively connected with the resistance element heating system 9 and the high-temperature heat-resistant electrode system 11.
The resistance element heating system 9 is used for heating the material to be heated in the furnace body. The high temperature heat-resistant electrode system 11 forms a current loop with the material to be heated, which has a resistance value by itself, and self-heats the material after the current passes through the material to be heated.
Wherein, the furnace body comprises a furnace body shell 1, a furnace body heat preservation and insulation layer 2 and a high temperature resistant heat preservation clapboard 3.
Preferably, the resistive element heating system 9 may include: a first resistive element heating unit 9-1 and a second resistive element heating unit 9-2.
The first resistance element heating unit 9-1 is attached to a first inner surface of the furnace body hearth. The second resistance element heating unit 9-2 is attached to the second inner surface of the furnace body hearth. The first and second resistance element heating units 9-1 and 9-2 are symmetrically arranged.
In addition, the resistance element heating unit consists of two or more groups of resistance heating elements, a refractory material bracket for supporting the resistance heating elements and a partition board with high temperature resistance, wear resistance and good heat conductivity.
Preferably, the high-temperature and heat-resistant electrode system 11 includes: a first high temperature refractory electrode unit 11-1 and a second high temperature refractory electrode unit 11-2. The first high-temperature heat-resistant electrode unit 11-1 is attached to the third inner surface of the furnace body hearth. And the second high-temperature heat-resistant electrode unit 11-2 is attached to the fourth inner surface of the furnace body hearth. The first high temperature heat-resistant electrode unit 11-1 and the second high temperature heat-resistant electrode unit 11-2 are symmetrically disposed.
Wherein the high-temperature heat-resistant electrode unit comprises two or more groups of high-temperature heat-resistant electrodes.
Preferably, the first resistance element heating unit 9-1, the first high temperature heat-resistant electrode unit 11-1, the second resistance element heating unit 9-2 and the second high temperature heat-resistant electrode unit 11-2 are fixed in a closed loop to form a material placing space for placing a material to be heated.
Preferably, the resistance element heating system 9 further comprises: a first high temperature resistant insulating lining body 11-3 and a second high temperature resistant insulating lining body 11-4.
The first high temperature resistant insulating liner 11-3 wraps the first resistance element heating unit 9-1. The second high temperature resistant insulating liner 11-4 wraps the second resistance element heating unit 9-2.
Preferably, the first high temperature-resistant insulating lining body 11-3 wraps the first high temperature-resistant electrode unit 11-1. The second high-temperature-resistant insulating lining body 11-4 wraps the second high-temperature-resistant electrode unit 11-2. And the first high-temperature resistant insulating lining body 11-3, the first high-temperature resistant electrode unit 11-1, the second high-temperature resistant insulating lining body 11-4 and the second high-temperature resistant electrode unit 11-2 are fixed in a closed loop manner to form a material placing space for placing materials to be heated.
Preferably, the power supply system 7 includes: a first power supply unit and a second power supply unit.
The first power supply unit is connected to the resistive element heating system 9. The second power supply unit is connected with the high-temperature heat-resistant electrode system 11.
Preferably, the hybrid electric heating shaft kiln further includes: the channel is protected.
The power supply system 7 is respectively connected with the resistance element heating system 9 and the high-temperature heat-resistant electrode system 11 through the protection channel.
Preferably, the material of the protection channel is a heat-resistant insulating material or a heat-insulating material.
Preferably, the hybrid electrically heated shaft kiln further comprises: temperature measurement control system 10.
The temperature measurement control system 10 is arranged outside the furnace body. The temperature measurement control system 10 is used for adjusting heating electric power and heating time in real time according to the temperature of the material to be heated.
Preferably, the thermometric control system 10 comprises a thermocouple, a signal transmitter and an electrical control cabinet. The thermocouple adopted by the utility model is preferably a platinum-platinum rhodium thermocouple.
The thermocouple is used for detecting the temperature of the material to be heated in the hearth of the furnace body. The signal transmitter is used for transmitting the temperature signal detected by the thermocouple to the electrical control cabinet. The electric control cabinet is used for setting heating temperature according to the material to be heated and setting heating electric power and heating time according to the temperature signal.
Furthermore, the utility model provides a hybrid electric heating shaft kiln still includes furnace body charge-in system 8 and furnace body discharge system 6. Wherein, furnace body charge-in system 8 includes conveyer belt, hopper and bell. The furnace body discharging system 6 comprises a conveying belt, a flashboard, a thimble and a hydraulic device.
Further because the material of heating is different, and the heating temperature of setting for is different, and required furnace atmosphere is different, the utility model provides a selection of each part is specifically as follows in the hybrid electric heating shaft kiln:
1. the temperature sensing device or means in the temperature sensing control system 10 is selected based on the maximum temperature achievable by the furnace warming.
2. And selecting the resistance heating element according to the heating temperature required by the hearth.
3. The high temperature heat-resistant electrode is selected according to the heating temperature of the material itself to be heated.
4. And selecting the high-temperature-resistant heat-insulating partition plate 3 according to the highest temperature capable of being born in the hearth.
5. The shape and size of the furnace is selected according to the material characteristics and shape and the heat transfer efficiency.
6. The furnace atmosphere is selected according to the atmosphere required by heating the material, such as reducing atmosphere, oxidizing atmosphere, vacuum, non-vacuum and the like.
The hybrid electric heating shaft furnace provided by the invention is explained by taking hearths of different shapes as an example.
Example 1
The mixed electric heating shaft kiln with a square hearth (as shown in figure 2) comprises: the furnace body comprises a furnace body shell 1, a furnace body heat-insulating layer 2, a high-temperature-resistant heat-insulating partition plate 3, a power supply protective lining 4, a temperature measurement control system 10, a high-temperature wear-resistant lining plate 5, a high-temperature heat-resistant electrode system 11, a resistance element heating system 9, a furnace body feeding system 8 and a furnace body discharging system 6.
Wherein the heat-resistant electrode is composed of a group of positive electrodes and a group of negative electrodes. The power supply passes through a protection channel arranged on the furnace body and is connected with the high-temperature heat-resistant electrode, and two ends of the electrode are connected with a power supply cable. When the heating furnace works, power supply current sequentially passes through the transformer, the cable, the positive end of the high-temperature heat-resistant electrode, the heated material and the negative end of the high-temperature heat-resistant electrode to form a power supply loop.
Example 2
The hybrid electric heating shaft kiln with a rectangular hearth (as shown in fig. 3) comprises: the furnace body comprises a furnace body shell 1, a furnace body heat-insulating layer 2, a high-temperature-resistant heat-insulating partition plate 3, a power supply protective lining 4, a temperature measurement control system 10, a high-temperature wear-resistant lining plate 5, a high-temperature heat-resistant electrode system 11, a resistance element heating system 9, a furnace body feeding system 8 and a furnace body discharging system 6.
The refractory electrode is composed of a set of positive electrodes and a set of negative electrodes. The power supply passes through a protection channel arranged on the furnace body and is connected with the high-temperature heat-resistant electrode, and two ends of the electrode are connected with a power supply cable. When the heating furnace works, power supply current sequentially passes through the transformer, the cable, the positive end of the high-temperature heat-resistant electrode, the heated material and the negative end of the high-temperature heat-resistant electrode to form a power supply loop.
Example 3
The hybrid electric heating shaft kiln with a round hearth (as shown in figure 4) comprises: the furnace body comprises a furnace body shell 1, a furnace body heat-insulating layer 2, a high-temperature-resistant heat-insulating partition plate 3, a power supply protective lining 4, a temperature measurement control system 10, a high-temperature wear-resistant lining plate 5, a high-temperature heat-resistant electrode system 11, a resistance element heating system 9, a furnace body feeding system 8 and a furnace body discharging system 6.
The refractory electrode is composed of a set of positive electrodes and a set of negative electrodes. The power supply passes through a protection channel arranged on the furnace body and is connected with the high-temperature heat-resistant electrode, and two ends of the electrode are connected with a power supply cable. When the heating furnace works, power supply current sequentially passes through the transformer, the cable, the positive end of the high-temperature heat-resistant electrode, the heated material and the negative end of the high-temperature heat-resistant electrode to form a power supply loop.
In the above embodiment, the electrodes employed in the resistance element heating system 9 are constituted by the positive electrode and the negative electrode. The electrode is connected with the resistance heating element through the insulation channel arranged on the furnace body, two ends of the electrode are connected with the power cable, and the power current sequentially passes through the cable, the positive electrode, the resistance heating element and the negative electrode to form a power circuit.
Compared with the prior art, the utility model has the advantages of as follows:
1. the shape and the sealing performance of the hearth can be controlled, so that the hearth atmosphere is easy to control, and the types of the heated materials are effectively widened.
2. The temperature of the hearth can be adjusted in a wide range (room temperature-1800 ℃), and the method is suitable for the requirements of various materials on heating temperature.
3. Effectively overcomes the defects that the resistivity of the heated material is higher or lower at the low temperature stage, the fluctuation value is large and the like which are not beneficial to the self-heating of the directly electrified material.
4. High-temperature smoke generated by fuel heating is avoided, heat loss is reduced, and heat efficiency is improved.
5. The electric heating device has the characteristics of simple structure and low cost, and can simplify the structure of the whole device.
6. The electric heating avoids the pollution of the heated materials and the environment caused by fuel heating.
7. The heated material directly heats, so that the heat transfer loss from a heating element to the material is saved, and the heat efficiency is improved.
8. The materials are heated uniformly, and the quality of the heated materials is easy to control.
9. The material itself generates heat directly, and the heating temperature of the material itself can be higher than the temperature endured by the hearth wall of the shaft furnace.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. A hybrid electrically heated shaft kiln, comprising: the device comprises a furnace body, a power supply system, a resistance element heating system and a high-temperature heat-resistant electrode system;
the resistance element heating system and the high-temperature heat-resistant electrode system are both arranged in the furnace body;
the power supply system is respectively connected with the resistance element heating system and the high-temperature heat-resistant electrode system;
the resistance element heating system is used for heating the material to be heated in the furnace body; the high-temperature heat-resistant electrode system forms a current loop with the material to be heated, and the material to be heated self-heats when current passes through the material to be heated due to the resistance of the material to be heated.
2. The hybrid electrically heated shaft kiln of claim 1, wherein the resistive element heating system comprises: a first resistive element heating unit and a second resistive element heating unit;
the first resistance element heating unit is attached to the first inner surface of the furnace body hearth; the second resistance element heating unit is attached to the second inner surface of the furnace body hearth; the first resistance element heating unit and the second resistance element heating unit are symmetrically arranged.
3. The hybrid electrically heated shaft kiln of claim 2, wherein the high temperature heat resistant electrode system comprises: a first high temperature refractory electrode unit and a second high temperature refractory electrode unit; the first high-temperature heat-resistant electrode unit is attached to and arranged on the third inner surface of the furnace body hearth; the second high-temperature heat-resistant electrode unit is attached to and arranged on the fourth inner surface of the furnace body hearth; the first high temperature heat-resistant electrode unit and the second high temperature heat-resistant electrode unit are symmetrically arranged.
4. The hybrid electrically heated shaft kiln of claim 3, wherein the first resistance element heating unit, the first high temperature heat-resistant electrode unit, the second resistance element heating unit and the second high temperature heat-resistant electrode unit are fixed in a closed loop to form a material placing space for placing a material to be heated.
5. The hybrid electrically heated shaft kiln of claim 3, wherein the high temperature heat resistant electrode system further comprises: the first high-temperature-resistant insulating lining body and the second high-temperature-resistant insulating lining body;
the first high-temperature-resistant insulating lining body wraps the first high-temperature-resistant electrode unit; the second high-temperature-resistant insulating lining body wraps the second high-temperature-resistant electrode unit; and the first high-temperature-resistant insulating lining body, the first high-temperature-resistant electrode unit, the second high-temperature-resistant insulating lining body and the second high-temperature-resistant electrode unit are fixed in a closed loop manner, so that a material placing space for placing materials to be heated is formed.
6. The hybrid electrically heated shaft kiln of claim 1, wherein the power supply system comprises: a first power supply unit and a second power supply unit;
the first power supply unit is connected with the resistance element heating system; and the second power supply unit is connected with the high-temperature heat-resistant electrode system.
7. The hybrid electrically heated shaft kiln of claim 1, further comprising: a protection channel;
and the power supply system is respectively connected with the resistance element heating system and the high-temperature heat-resistant electrode system through the protection channel.
8. The hybrid electrically heated shaft kiln as recited in claim 7, wherein the protective channel is made of a heat resistant insulating material or a heat insulating material.
9. The hybrid electrically heated shaft kiln of claim 1, further comprising: a temperature measurement control system;
the temperature measurement control system is arranged on the outer side of the furnace body; the temperature measurement control system is used for adjusting heating electric power and heating time in real time according to the temperature of the material to be heated.
10. The hybrid electrically heated shaft kiln of claim 9, wherein the thermometry control system includes a thermocouple, a signal transmitter, and an electrical control cabinet;
the thermocouple is used for detecting the temperature of the material to be heated in the furnace body hearth; the signal transmitter is used for transmitting the temperature signal detected by the thermocouple to the electrical control cabinet; the electric control cabinet is used for setting heating temperature according to the material to be heated and setting heating electric power and heating time according to the temperature signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021774078.6U CN212431714U (en) | 2020-08-24 | 2020-08-24 | Hybrid electric heating shaft kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021774078.6U CN212431714U (en) | 2020-08-24 | 2020-08-24 | Hybrid electric heating shaft kiln |
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| CN212431714U true CN212431714U (en) | 2021-01-29 |
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| CN202021774078.6U Active CN212431714U (en) | 2020-08-24 | 2020-08-24 | Hybrid electric heating shaft kiln |
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| CN (1) | CN212431714U (en) |
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