Reduction roasting system for performing gas-based reduction roasting by using coal
The carbon monoxide is generated through a coal gas generator and regulated by inert gas, which solves the problem of slow coal-based reduction roasting reaction rate in the prior art, and achieves a more efficient roasting effect, which is suitable for areas lacking reducing gas.
Patent Information
- Application Number
- CN202420949516.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-06
AI Technical Summary
Since my country's energy structure is "rich coal and less gas", the gas-based reduction and roasting system is not effective in making the reaction rate slower and the roasting effect is poor. The existing coal-based reduction and roasting system cannot effectively utilize the rich coal resources.
Design a system for gas-based reduction and roasting using coal, react coal with carbon dioxide to generate carbon monoxide through a gas generator, and use inert gas to adjust the carbon monoxide concentration, remove carbon dioxide, water vapor, tar and coke dust through a filter to improve the reduction gas Purity and roasting effect.
While ensuring the reduction effect, the limitation of the reducing agent is reduced, and the reduction and roasting can be used to use cheap and inferior coal, which improves the reaction rate and roasting effect, and is suitable for areas with insufficient reduction gas.
Smart Images
Figure CN222317722U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ore dressing, in particular to a reduction roasting system using coal for gas-based reduction roasting. Background Art
[0002] Reduction roasting is an effective method for processing complex and difficult-to-select iron ore. In a roasting furnace, the reducing agent is mixed with the iron ore to be processed and then heated, thereby converting the weakly magnetic iron minerals into strongly magnetic iron minerals. Reduction roasting is generally divided into coal-based reduction roasting and gas-based reduction roasting. The reducing agent used in coal-based reduction roasting is directly coal, biomass, etc., while the organic reducing agent used in gas-based reduction roasting is directly CO, H2 and other gases. Gas-based reduction roasting has the characteristics of large gas-solid contact area, fast gas-solid reaction rate and good roasting effect. However, due to the energy structure of my country's "rich in coal and less gas", in order to save energy, coal-based reduction roasting is usually used. However, compared with gas-based reduction roasting, the reaction rate of coal-based reduction roasting is slower and the roasting effect is not good. Utility Model Content
[0003] The utility model aims to provide a reduction roasting system using coal for gas-based reduction roasting, which uses abundant coal to prepare reducing gas for reduction roasting, accelerates the reaction rate and improves the roasting effect.
[0004] In order to achieve the above-mentioned utility model purpose, the utility model uses the following technical schemes for the reduction roasting system for gas-based reduction roasting using coal:
[0005] A reduction roasting system using coal for gas-based reduction roasting comprises a gasifier and a roasting furnace, wherein the gasifier comprises a furnace body, a first electric heating device is arranged inside the furnace body, a carbon dioxide inlet and a coal addition inlet are arranged in the furnace body, the carbon dioxide inlet is arranged at the bottom of the furnace body, and the carbon dioxide inlet is connected to a carbon dioxide source through a carbon dioxide pipeline; the coal addition inlet is arranged at the top of the furnace body, coal enters the furnace body through the coal addition inlet and reacts with carbon dioxide to generate carbon monoxide; a carbon monoxide outlet is arranged at the top of the furnace body for discharging carbon monoxide generated by the reaction, the carbon monoxide outlet is connected to a gas mixing tank through a carbon monoxide pipeline, inert gas is added to the gas mixing tank, the gas mixing tank is connected to an inert gas source through an inert gas pipeline, the outlet end of the gas mixing tank is connected to the roasting furnace through a mixed gas pipeline, the roasting furnace is provided with a reducing gas inlet connected to the mixed gas pipeline, the roasting furnace is provided with a material inlet for adding materials, and a second electric heating device is arranged inside the roasting furnace.
[0006] Preferably, the carbon monoxide pipeline is provided with a first filter, a second filter and a third filter in sequence along the flow direction of the gas, the filter medium of the first filter is soda lime, the filter medium of the second filter is silica gel, and the filter medium of the third filter is absorbent cotton.
[0007] Preferably, the inert gas source is used to generate nitrogen or argon.
[0008] Preferably, the carbon dioxide pipeline is provided with a carbon dioxide flow regulating valve.
[0009] Preferably, the carbon monoxide pipeline is provided with a carbon monoxide flow regulating valve.
[0010] Preferably, the inert gas pipeline is provided with an inert gas flow regulating valve.
[0011] Preferably, the mixed gas pipeline is provided with a mixed gas flow regulating valve.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] 1. The utility model utilizes coal and carbon dioxide to react to prepare carbon monoxide as reducing gas, and the prepared reducing gas is introduced into the roasting furnace. Therefore, while ensuring the reduction effect, the restriction of the reducing agent in the reduction roasting reaction is reduced, and cheaper and inferior coal can be used for reduction roasting, which is more suitable for areas lacking reducing gas;
[0014] 2. One of the functions of the inert gas used in the utility model is to adjust the concentration of carbon monoxide, and obtain the appropriate concentration of carbon monoxide for reduction roasting as needed; another function is to introduce the inert gas into the roasting furnace in advance to discharge the air in the roasting furnace and improve the roasting effect;
[0015] 3. The utility model sets a first filter, a second filter and a third filter, wherein the filter medium of the first filter is soda lime, the filter medium of the second filter is silica gel, and the filter medium of the third filter is absorbent cotton. Therefore, the generated carbon monoxide is filtered to remove carbon dioxide, water vapor, tar and coke dust, and then enters the mixing tank through the carbon monoxide flow regulating valve, thereby ensuring the purity of the reducing gas and further ensuring the roasting effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Among them, 1 carbon dioxide source, 2 gas generator, 201 furnace body, 202 carbon dioxide inlet, 203 coal inlet, 204 carbon monoxide outlet, 3 first filter, 4 second filter, 5 third filter, 6 inert gas source, 7 mixing tank, 8 roasting furnace, 801 reducing gas inlet, 802 material inlet, 9 carbon dioxide pipeline, 10 carbon dioxide flow regulating valve, 11 carbon monoxide pipeline, 12 carbon monoxide flow regulating valve, 13 inert gas flow regulating valve, 14 mixed gas pipeline, 15 mixed gas flow regulating valve, 16 inert gas pipeline. DETAILED DESCRIPTION
[0018] The present invention is further explained below in conjunction with specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.
[0019] like Figure 1 As shown, a reduction roasting system using coal for gas-based reduction roasting includes a gasifier 2 and a roasting furnace 8. The gasifier 2 includes a furnace body 201. A first electric heating device is arranged inside the furnace body 201. The first electric heating device is a resistance wire heating. The furnace body 201 is provided with a carbon dioxide inlet 202 and a coal inlet 203. The carbon dioxide inlet 202 is arranged at the bottom of the furnace body 201. The carbon dioxide inlet 202 is connected to a carbon dioxide source 1 through a carbon dioxide pipeline 9. The carbon dioxide source 1 comes from a carbon dioxide gas generating cabinet. The carbon dioxide pipeline 9 is provided with a carbon dioxide flow regulating valve 10; the coal inlet 203 is arranged at the top of the furnace body 201. Coal enters the furnace body 201 through the coal inlet 203 and reacts with carbon dioxide to generate carbon monoxide; a carbon monoxide outlet 204 for discharging the carbon monoxide generated by the reaction is provided at the top of the furnace body 201. The carbon monoxide outlet 204 is connected to a mixing tank 7 through a carbon monoxide pipeline 11. The carbon monoxide pipeline 11 is provided with a A carbon monoxide flow regulating valve 12 is provided, inert gas is added to the gas mixing tank 7, the gas mixing tank 7 is connected to the inert gas source 6 through an inert gas pipeline 16, the inert gas pipeline 16 is provided with an inert gas flow regulating valve 13, the inert gas source 6 is used to generate nitrogen or argon, the inert gas source 6 comes from a nitrogen generator or an argon generator, the outlet end of the gas mixing tank 7 is connected to the roasting furnace 8 through a mixed gas pipeline 14, the mixed gas pipeline 14 is provided with a mixed gas flow regulating valve 15, the roasting furnace 8 is provided with a reducing gas inlet 801 connected to the mixed gas pipeline 14, the roasting furnace 8 is provided with a material inlet 802 for adding materials, and a second electric heating device is provided inside the roasting furnace 8, and the second electric heating device is a resistance wire heating; the carbon monoxide pipeline 11 is provided with a first filter 3, a second filter 4 and a third filter 5 in sequence along the flow direction of the gas, the filter medium of the first filter 3 is soda lime, the filter medium of the second filter 4 is silica gel, and the filter medium of the third filter 5 is absorbent cotton.
[0020] The specific working process and principle of the utility model are as follows: add 1-2mm coal to the gas generator 2, set the temperature to any value between 1200-1400℃, raise the temperature to the specified temperature, add a certain amount of ore sample to be processed to the roasting furnace 8, raise the temperature to the temperature required for the reaction, open the carbon dioxide gas supply cabinet, and introduce carbon dioxide gas into the gas generator 2. Carbon dioxide reacts with coal to generate carbon monoxide, and carbon monoxide passes through the first filter 3, the second filter 4, and the third filter 5. Among them, the filter medium of the first filter 3 is soda lime, the filter medium of the second filter 4 is silica gel, and the filter medium of the third filter 5 is absorbent cotton. At this point, the generated carbon monoxide is filtered to remove carbon dioxide, water vapor, tar and coke dust, and then enters the mixing tank 7 through the carbon monoxide flow regulating valve 12; at the same time, the inert gas flow regulating valve 13 is opened, and nitrogen or argon is provided by the inert gas source 6 to enter the mixing tank 7 to mix with the carbon monoxide, thereby adjusting the carbon monoxide concentration required for reduction roasting, and then, the mixed gas flow regulating valve 15 is opened to send the carbon monoxide of appropriate concentration into the roasting furnace 8, and the roasting furnace 8 heats the carbon monoxide so that the high-temperature carbon monoxide enters the roasting furnace 8 and is reduction roasted in a suspended state with the ore sample to be processed in the roasting furnace 8 to generate a strongly magnetic iron mineral.
[0021] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0022] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.
[0023] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.
Claims
1. A reduction roasting system using coal for gas-based reduction roasting, characterized in that: It includes a gasifier and a roasting furnace. The gasifier includes a furnace body. A first electric heating device is arranged inside the furnace body. The furnace body is provided with a carbon dioxide inlet and a coal inlet. The carbon dioxide inlet is arranged at the bottom of the furnace body, and the carbon dioxide inlet is connected to a carbon dioxide source through a carbon dioxide pipeline; the coal inlet is arranged at the top of the furnace body, and coal enters the furnace body through the coal inlet and reacts with carbon dioxide to generate carbon monoxide; a carbon monoxide outlet is arranged on the top of the furnace body to discharge the carbon monoxide generated by the reaction, and the carbon monoxide outlet is connected to a gas mixing tank through a carbon monoxide pipeline. Inert gas is added to the gas mixing tank, and the gas mixing tank is connected to an inert gas source through an inert gas pipeline. The outlet end of the gas mixing tank is connected to the roasting furnace through a mixed gas pipeline. The roasting furnace is provided with a reducing gas inlet connected to the mixed gas pipeline, and the roasting furnace is provided with a material inlet for adding materials. A second electric heating device is arranged inside the roasting furnace.
2. The reduction roasting system for gas-based reduction roasting using coal according to claim 1, characterized in that: The carbon monoxide pipeline is provided with a first filter, a second filter and a third filter in sequence along the flow direction of the gas, the filter medium of the first filter is soda lime, the filter medium of the second filter is silica gel, and the filter medium of the third filter is absorbent cotton.
3. The reduction roasting system for gas-based reduction roasting using coal according to claim 1, characterized in that: The inert gas source is used to generate nitrogen or argon.
4. The reduction roasting system for gas-based reduction roasting using coal according to claim 1, characterized in that: The carbon dioxide pipeline is provided with a carbon dioxide flow regulating valve.
5. The reduction roasting system for gas-based reduction roasting using coal according to claim 1, characterized in that: The carbon monoxide pipeline is provided with a carbon monoxide flow regulating valve.
6. The reduction roasting system for gas-based reduction roasting using coal according to claim 1, characterized in that: The inert gas pipeline is provided with an inert gas flow regulating valve.
7. The reduction roasting system for gas-based reduction roasting using coal according to claim 1, characterized in that: The mixed gas pipeline is provided with a mixed gas flow regulating valve.