CN209836218U - Coal-based direct reduction shaft furnace and direct reduction production system - Google Patents
Coal-based direct reduction shaft furnace and direct reduction production system Download PDFInfo
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- CN209836218U CN209836218U CN201920171537.2U CN201920171537U CN209836218U CN 209836218 U CN209836218 U CN 209836218U CN 201920171537 U CN201920171537 U CN 201920171537U CN 209836218 U CN209836218 U CN 209836218U
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Abstract
The utility model relates to a coal-based direct reduction shaft furnace, including furnace body and air vortex tube, be equipped with the nozzle on the furnace body, the nozzle is connected with gas supply pipe and combustion-supporting gas supply pipe, the high temperature air outlet of air vortex tube with combustion-supporting gas supply pipe intercommunication. In addition, the direct reduction production system adopting the coal-based direct reduction shaft furnace is also related. The utility model provides a coal-based direct reduction shaft furnace and direct reduction production system directly produces high temperature air through the air vortex tube to use as combustion air, can show the temperature that improves combustion air, make the gas fully burn, thereby improve the efficiency of gas burning effectively, reduce the production energy consumption.
Description
Technical Field
The utility model belongs to the technical field of the shaft furnace, concretely relates to coal-based direct reduction shaft furnace and adopt this coal-based direct reduction shaft furnace's direct reduction production system.
Background
In the production of the shaft furnace, gas is combusted through a burner to provide heat energy for a furnace body, and combustion air is generally adopted for supporting combustion.
At present, the conventional process adopts high-temperature flue gas discharged by a shaft furnace to preheat combustion-supporting air so as to improve the efficiency and effect of gas combustion, enable the gas to be fully combusted, and provide more heat so as to reduce energy consumption. However, in practical engineering applications, because the indirect heat exchange efficiency between the high-temperature flue gas and the combustion air is relatively low, an ideal combustion air preheating effect is not achieved.
In addition, for the direct reduction shaft furnace, the direct reduction shaft furnace generally has a cooling section for cooling the reduction pellets and discharging the reduction pellets outside the furnace body, at present, two cooling modes of natural cooling and cooling water introduced into the wall body of the cooling section are mainly adopted, the cooling efficiency of the natural cooling is low, a large amount of water resources are consumed by adopting the cooling water, and when the circulating water is adopted for cooling, the cooling capacity is required to be provided for cooling the circulating water, so that the energy consumption of the production and operation of the shaft furnace is increased.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a coal-based direct reduction shaft furnace and adopt this coal-based direct reduction shaft furnace's direct reduction production system can solve prior art's partial defect at least.
An embodiment of the utility model provides a coal-based direct reduction shaft furnace, the induction cooker comprises a cooker bod, be equipped with the nozzle on the furnace body, the nozzle is connected with gas and supplies pipe and combustion-supporting gas to supply the pipe, still includes air vortex tube, air vortex tube's high temperature air outlet with combustion-supporting gas supplies the pipe intercommunication.
Further, the furnace body includes the combustion chamber and arranges in a plurality of reduction rooms in the combustion chamber, the nozzle is arranged on the combustion chamber.
Further, each reduction chamber comprises a reduction section located in the combustion chamber and a cooling section located below the combustion chamber.
Furthermore, cooling air channels are arranged in the wall body of the cooling section, and cooling air inlets of the cooling air channels are communicated with the low-temperature air outlet of the air vortex tube.
Furthermore, a cooling air outlet of each cooling air channel is communicated with a heat exchange air pipe, a bypass pipe is arranged on the heat exchange air pipe, a bypass valve is arranged on the bypass pipe, and the bypass pipe is communicated with the combustion-supporting air supply pipe.
Furthermore, cooling water flow channels are arranged in the wall body of the cooling section, each cooling water flow channel is communicated with a cooling water circulation pipeline, a condenser is arranged on the cooling water circulation pipeline, and a condensing medium pipe of the condenser is communicated with a low-temperature air outlet of the air vortex pipe.
Furthermore, the top of each reduction chamber is provided with a coal gas outlet, each coal gas outlet is communicated with a coal gas exhaust pipe, and the coal gas exhaust pipe is connected to the fuel gas supply pipe in a bypassing manner.
Furthermore, a dust remover is arranged on the gas exhaust pipe.
The embodiment of the utility model provides a direct reduction production system is still provided, including direct reduction furnace, pelletizing preparation mechanism and pelletizing drying chamber, the pelletizing drying chamber pass through feed mechanism with direct reduction furnace's feed bin links up, direct reduction furnace adopts as above coal-based direct reduction shaft furnace.
Further, a high-temperature air branch pipe is connected to a high-temperature air outlet of the air vortex pipe and is connected to the pellet drying chamber.
The embodiment of the utility model provides a following beneficial effect has at least:
the utility model provides a coal-based direct reduction shaft furnace directly produces high temperature air through the air vortex tube to use as combustion air, can show ground and improve combustion air's temperature, make the gas fully burn, thereby improve the efficiency of gas burning effectively, reduce this shaft furnace operation energy consumption.
The embodiment of the utility model provides a further following beneficial effect has:
the low-temperature air is introduced into the cooling air runner of the cooling section, so that the low-temperature air generated by the air vortex tube can be utilized, the resource waste of the by-product is avoided, the traditional cooling water cooling mode can be replaced, the water resource can be effectively saved, and the production energy consumption is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a coal-based direct reduction shaft furnace provided by an embodiment of the present invention.
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 efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1, the embodiment of the utility model provides a coal-based direct reduction shaft furnace, including furnace body 1, be equipped with nozzle 111 on the furnace body 1, nozzle 111 is connected with gas supply pipe and combustion-supporting gas supply pipe, and nozzle 111 is used for making the gas burning and provide the required heat of direct reduction, generally, has arranged a plurality of nozzles 111 on furnace body 1, guarantees sufficient heat energy and even heat supply.
The shaft furnace can adopt a traditional internal heating type shaft furnace, a furnace chamber of the furnace body 1 is used as a reduction place and is also used as a combustion place, and the specific structure is not described again; it is also possible to use an externally heated shaft furnace, i.e. the reduction site is isolated from the combustion site, and the direct reduction can be carried out in an air-insulated environment. In the embodiment, an external heating type shaft furnace is preferably adopted, the reducing atmosphere and the reducing temperature are easy to control, the direct reduction effect is good, and the reduction product is not easy to oxidize secondarily; specifically, as shown in fig. 1, the furnace body 1 includes a combustion chamber 11 and a plurality of reduction chambers 12 arranged in the combustion chamber 11, the burners 111 are arranged on the combustion chamber 11, the combustion chamber 11 and the reduction chambers 12 are separated by furnace walls, gas is combusted in the combustion chamber 11 to provide heat for each reduction chamber 12, and the heat is transferred to the material in the reduction chamber 12 by heat conduction through the furnace walls of the reduction chambers 12. The external heating type shaft furnace is the existing equipment, and the specific structure is not detailed here.
Generally, the shaft furnace includes a reduction zone 121 and a cooling zone 122, wherein the materials are directly reduced in the reduction zone 121, the reduced products are cooled in the cooling zone 122, and the cooled reduced products are discharged out of the furnace body 1. As shown in fig. 1, in the case of the above-described external heating type shaft furnace, each reduction chamber 12 includes a reduction section 121 located inside the combustion chamber 11 and a cooling section 122 located below the combustion chamber 11.
In this embodiment, it is further preferable that, as shown in fig. 1, the coal-based direct reduction shaft furnace further includes an air vortex tube 2, and a high-temperature air outlet of the air vortex tube 2 is communicated with the combustion-supporting gas supply tube. The air vortex tube 2 is a conventional device, commercially available, and the specific structure thereof is readily known to those skilled in the art.
The coal-based direct reduction shaft furnace provided by the embodiment directly generates high-temperature air through the air vortex tube 2, and the high-temperature air is used as combustion-supporting air, so that the temperature of the combustion-supporting air can be obviously increased, fuel gas can be fully combusted, the combustion efficiency of the fuel gas can be effectively improved, and the operation energy consumption of the shaft furnace can be reduced.
The air vortex tube 2 can simultaneously generate high-temperature air and low-temperature air, namely, the air vortex tube is provided with a high-temperature air outlet and a low-temperature air outlet, and the generated high-temperature air can be used as combustion-supporting air, and the generated low-temperature air can also be effectively utilized. In this embodiment, the part of the low-temperature air is directly used as the cooling medium for the cooling sections 122, for example, the low-temperature air generated by the air vortex tube 2 can be directly sprayed to the space around each cooling section 122, so that the low-temperature air is diffused outside the furnace wall of the cooling section 122, and the cooling efficiency of the cooling section 122 can be improved; in another embodiment, cooling air channels are provided in the wall of the cooling section 122, and the low-temperature air is introduced into the cooling air channels, that is, the cooling air inlet of each cooling air channel is communicated with the low-temperature air outlet of the vortex tube 2.
Based on the structure, the low-temperature air generated by the air vortex tube 2 can be utilized, the resource waste of the byproduct is avoided, the traditional cooling water cooling mode can be replaced, the water resource can be effectively saved, and the production energy consumption is reduced.
Further preferably, in the above-mentioned embodiment of introducing the low-temperature air into the cooling airflow channel of the cooling section 122, after the low-temperature air exchanges heat via the cooling airflow channel, the temperature rises, and heat-exchange air is discharged from the cooling airflow channel, and these heat-exchange air can also be used as combustion air, specifically: the cooling air outlet of each cooling air channel is communicated with a heat exchange air pipe, a bypass pipe is arranged on the heat exchange air pipe, a bypass valve is arranged on the bypass pipe, and the bypass pipe is communicated with the combustion-supporting air supply pipe. When the high-temperature air generated by the air vortex tube 2 is not enough to meet the usage amount of combustion-supporting air, the bypass valve can be opened, and the heat exchange air is used as supplementary combustion-supporting air.
As another preferred embodiment of the coal-based direct reduction shaft furnace provided in this embodiment, the cooling section 122 still adopts a conventional water cooling manner, that is, cooling water flow channels are provided in a wall body of the cooling section 122, each of the cooling water flow channels is communicated with a cooling water circulation pipeline, and a condenser is provided on the cooling water circulation pipeline; in this embodiment, the low-temperature air is used as the condensing medium and applied to the condenser, so that the resource waste of the byproduct can be avoided, and the energy consumption of the conventional condenser is reduced, that is, the condensing medium pipe of the condenser is communicated with the low-temperature air outlet of the air vortex pipe 2.
It will be readily appreciated that the temperature of the high and low temperature air generated by the air vortex tube 2 is controllable, as is conventional in the art of air vortex tubes 2. The temperature of the high-temperature air and the low-temperature air can be determined according to actual working conditions, for example, for the case that the low-temperature air is introduced into the cooling air flow channel of the cooling section 122, the temperature of the low-temperature air does not need to be too low, and can be controlled within the range of 0-10 ℃; in the case of applying the low-temperature air as the condensing medium to the condenser, the temperature of the low-temperature air can be relatively low, for example, can be controlled within a range of-10 to 5 ℃.
Further preferably, the top of each reduction chamber 12 is provided with a gas outlet, each gas outlet is communicated with a gas exhaust pipe, and the gas exhaust pipes are connected to the gas supply pipe in a bypassing manner, that is, the gas generated by each reduction chamber 12 can be used as the gas required by the combustion chamber 11, on one hand, the reduced gas has higher temperature and higher combustion effect, and on the other hand, the resource utilization of the reduced gas is realized, the gas consumption is reduced, and the operation cost of the shaft furnace is reduced. Based on the structure of the external heating type shaft furnace, the atmosphere in the reduction chamber 12 is controllable, the CO concentration in the flue gas discharged from the reduction chamber 12 can be ensured through the carbon distribution amount in the pellets, and the self-heat supply of the shaft furnace can be realized without additionally providing fuel gas or the required fuel gas amount is less by combining volatile components in the carbon distribution of the pellets. Understandably, the coal gas discharged from the top of the reduction chamber 12 carries dust and the like, and a dust remover is arranged on the coal gas calandria to avoid blocking the burners 111 and the like; the dust remover can be a cyclone dust remover, a bag-type dust remover and other conventional dust removing equipment.
Example two
The embodiment of the utility model provides a direct reduction production system, including direct reduction furnace, pelletizing preparation mechanism and pelletizing drying chamber, the pelletizing drying chamber pass through feed mechanism with direct reduction furnace's feed bin links up. The pellet preparation mechanism can adopt conventional pellet preparation equipment such as a disc pelletizer and a ball press, and the specific structure of the conventional pellet preparation equipment is not described herein. The feeding mechanism can adopt conventional feeding equipment such as a belt feeder and the like. The direct reduction furnace preferably adopts the coal-based direct reduction shaft furnace provided in the first embodiment, and the specific structure thereof is not described herein.
Further preferably, when the high-temperature air generated by the air vortex tube 2 is surplus, the surplus high-temperature air can be introduced into the pellet drying chamber to dry pellets, so that the energy consumption of system operation is further reduced; specifically, the high-temperature air outlet of the air vortex tube 2 is also connected with a high-temperature air branch tube, and the high-temperature air branch tube is connected to the pellet drying chamber.
Of course, the high temperature flue gas discharged from the combustion chamber 11 may be introduced into the pellet drying chamber.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a coal-based direct reduction shaft furnace, includes the furnace body, be equipped with the nozzle on the furnace body, the nozzle is connected with gas and supplies pipe and combustion-supporting gas to supply pipe, its characterized in that: the high-temperature air outlet of the air vortex tube is communicated with the combustion-supporting gas supply tube.
2. The coal-based direct reduction shaft furnace of claim 1, wherein: the furnace body includes the combustion chamber and arranges in a plurality of reduction rooms in the combustion chamber, the nozzle arrange in on the combustion chamber.
3. The coal-based direct reduction shaft furnace of claim 2, wherein: each reduction chamber comprises a reduction section positioned in the combustion chamber and a cooling section positioned below the combustion chamber.
4. The coal-based direct reduction shaft furnace of claim 3, wherein: and cooling air channels are arranged in the wall body of the cooling section, and cooling air inlets of the cooling air channels are communicated with the low-temperature air outlet of the air vortex tube.
5. The coal-based direct reduction shaft furnace of claim 4, wherein: each cooling gas outlet of the cooling gas channel is communicated with a heat exchange air pipe, a bypass pipe is arranged on the heat exchange air pipe, a bypass valve is arranged on the bypass pipe, and the bypass pipe is communicated with the combustion-supporting gas supply pipe.
6. The coal-based direct reduction shaft furnace of claim 3, wherein: and cooling water flow channels are arranged in the wall body of the cooling section, each cooling water flow channel is communicated with a cooling water circulation pipeline, a condenser is arranged on the cooling water circulation pipeline, and a condensing medium pipe of the condenser is communicated with a low-temperature air outlet of the air vortex pipe.
7. The coal-based direct reduction shaft furnace of claim 2, wherein: the top of each reduction chamber is provided with a coal gas outlet, each coal gas outlet is communicated with a coal gas exhaust pipe, and the coal gas exhaust pipe is connected to the fuel gas supply pipe in a bypassing manner.
8. The coal-based direct reduction shaft furnace of claim 7, wherein: and a dust remover is arranged on the gas discharge pipe.
9. A direct reduction production system comprises a direct reduction furnace, a pellet preparation mechanism and a pellet drying chamber, wherein the pellet drying chamber is connected with a storage bin of the direct reduction furnace through a feeding mechanism, and the direct reduction production system is characterized in that: the direct reduction furnace adopts the coal-based direct reduction shaft furnace as defined in any one of claims 1 to 8.
10. The direct reduction production system of claim 9, wherein: the high-temperature air outlet of the air vortex tube is also connected with a high-temperature air branch tube, and the high-temperature air branch tube is connected to the pellet drying chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920171537.2U CN209836218U (en) | 2019-01-30 | 2019-01-30 | Coal-based direct reduction shaft furnace and direct reduction production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920171537.2U CN209836218U (en) | 2019-01-30 | 2019-01-30 | Coal-based direct reduction shaft furnace and direct reduction production system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209836218U true CN209836218U (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920171537.2U Expired - Fee Related CN209836218U (en) | 2019-01-30 | 2019-01-30 | Coal-based direct reduction shaft furnace and direct reduction production system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209836218U (en) |
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2019
- 2019-01-30 CN CN201920171537.2U patent/CN209836218U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 Termination date: 20220130 |