Roasting pilot plant test system

Abstract

The utility model discloses a roasting pilot plant test system which comprises a central control system, a multifunctional roasting cup 1, a multifunctional roasting cup 2, a high-temperature flue gas generation device, a gas supply / cleaning system, a water cooling system, an induced draft fan, an electric heating system, a gas distribution system, a diffusion system 2, a diffusion system 1 and an air blower. By adopting the technical scheme of the utility model, the atmosphere, the temperature and the flow velocity can be adjusted and controlled; a material layer with a certain thickness formed by blocky materials can be subjected to oxidation, reduction or heating, cooling, sintering or roasting treatment under the protection of inert atmosphere, meanwhile, the flow speed flowing through the material layer can be regulated and controlled in the heating or cooling treatment process, the temperature in the material layer is monitored, and through matching with a granulation system, the granulation efficiency is improved. And heating, roasting and cooling treatment processes of different materials in a protective atmosphere can be simulated.

Description

Technical Field

[0001] This invention belongs to the fields of chemical engineering, solid waste treatment, thermal engineering and roasting process technology, and particularly relates to a roasting pilot-scale system. Background Technology

[0002] Industrial and agricultural production processes, such as metallurgy, chemical engineering, building materials, power generation, and grain processing, often involve the reaction of large quantities of bulk materials with gaseous media. These processes include drying, dehydration, preheating, isothermal roasting, continuous heating, and heating and cooling under protective atmospheres. Current research and practice in this area are conducted through laboratory pilot-scale experiments and industrial applications. However, key processes, such as selecting process parameters, often rely on experience or fluid dynamics simulations. It is well known that the two-phase mass and heat transfer between fluids and solid particles has always been a hot research topic in industry. Improving waste heat recovery efficiency in industrial processes, developing new heat exchange equipment, and refining mass-heat transfer methods are crucial limiting factors that urgently need to be addressed. Therefore, developing pilot-scale simulation equipment capable of accurately simulating gas-solid two-phase heat transfer in industrial processes and coupling the simulation results with fluid dynamics calculations can provide theoretical and technical support for selecting key process parameters in industrial processes, possessing significant theoretical and practical value. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a calcination pilot-scale system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A pilot-scale roasting system includes: a central control system, a multifunctional roasting cup I, a multifunctional roasting cup II, a high-temperature flue gas generator, a gas supply / purging system, a water cooling system, an induced draft fan, an electric heating system, a gas distribution system, a venting system II, a venting system I, and a blower; wherein, the central control system is connected to the electric heating system, the high-temperature flue gas generator, and the multifunctional roasting cup I; the central control system is connected to the multifunctional roasting cup I via temperature control; the multifunctional roasting cup I is connected to the gas supply / purging system, the water cooling system, and the venting system I; the water cooling system is connected to the induced draft fan; the electric heating system is connected to the blower, the gas distribution system, and the multifunctional roasting cup I and the multifunctional roasting cup II; the multifunctional roasting cup II is connected to the venting system II and the electric heating system.

[0006] As a preferred embodiment, the central control system is connected to the high-temperature flue gas generator via system control; the multi-functional roasting cup is connected to the water cooling system via the gas outlet pipe.

[0007] Preferably, one end of the multifunctional roasting cup is connected to the electric heating system via a gas supply line 1; the other end of the multifunctional roasting cup is connected to the electric heating system via a gas supply line 2; wherein, the gas supply line 1 is used for downward exhaust drying, and the gas supply line 2 is used for upward blowing drying.

[0008] Preferably, the high-temperature flue gas generator uses natural gas, liquefied petroleum gas, or bottled CO as fuel, and the high-temperature flue gas generator is dynamically adjusted online according to the requirements of gas flow and heating temperature for each section.

[0009] Preferably, the calcination pilot system can perform heating or cooling processes in atmospheres of H2, CO, O2, CO2, N2, argon inert gas, and mixtures of different gases.

[0010] As a preferred option, when the calcination temperature of the pilot-scale system is below 900°C, an electric heating system and a multifunctional calcining cup are used for heating or cooling in reducing, oxidizing, and inert atmospheres.

[0011] Preferably, when the pilot-scale system uses a roasting temperature higher than 900℃, it employs an electric heating system, a high-temperature flue gas generator, and a multi-functional roasting cup to provide heating or cooling in reducing, oxidizing, or inert atmospheres. The electric heating system and the high-temperature flue gas generator are used in stages. The electric heating system provides heating or cooling in reducing, oxidizing, or inert atmospheres when the roasting temperature is below 900℃; the high-temperature flue gas generator provides heating or cooling in weakly oxidizing or strongly oxidizing atmospheres when the roasting temperature is above 900℃.

[0012] As a preferred option, the roasting pilot-scale system is suitable for processing the following processes: the entire process of exploding iron concentrate oxidized pellets, forced-air drying, vacuum drying, preheating, roasting and cooling experiments; iron ore powder sintering treatment; oxidation or reduction magnetization roasting of refractory minerals such as limonite and magnesite; decarburization of coal gangue; drying treatment of materials containing volatile substances; and sintering process simulation of bulk inorganic solid waste such as coal gangue, fly ash, mine tailings, and non-ferrous waste to prepare porous ceramic media.

[0013] This invention enables adjustable and controllable atmosphere, temperature, and flow rate; it allows for heating and cooling of a material layer of a certain thickness formed from lumpy materials under oxidation, reduction, or inert atmosphere protection, while simultaneously regulating the flow rate through the material layer and monitoring the temperature within the material layer; by matching with a granulation system, it can simulate the calcination process of different materials; it provides key process parameters for industrial design and theoretical and technical support for subsequent improvements. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the calcination pilot-scale system according to an embodiment of the present invention;

[0016] Among them, 1-central control system, 10-multifunctional roasting cup one, 2-multifunctional roasting cup two, 9-high temperature flue gas generator, 8-gas supply / cleaning system, 7-water cooling system, 6-induced draft fan, 3-electric heating system, 4-gas distribution system, 5-blower. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1:

[0020] like Figure 1As shown, this embodiment of the invention provides a multifunctional roasting pilot-scale system, comprising: a central control system, a multifunctional roasting cup I, a multifunctional roasting cup II, a high-temperature flue gas generator, a gas supply / purging system, a water cooling system, an induced draft fan, an electric heating system, a gas distribution system, a second venting system, a first venting system, and a blower; wherein, the central control system is connected to the electric heating system, the high-temperature flue gas generator, and the multifunctional roasting cup I; the high-temperature flue gas generator is connected to the multifunctional roasting cup I via a gas supply pipeline III; the central control system is connected to the high-temperature flue gas generator via system control; the central control system is connected to the multifunctional roasting cup I via temperature control; the multifunctional roasting cup I is connected to the gas supply / purging system, the water cooling system, and the first venting system; the water cooling system is connected to the induced draft fan; the multifunctional roasting cup I is connected to the cooling system via an outlet pipeline I; the electric heating system is connected to the blower, the gas distribution system, the multifunctional roasting cup I, and the second multifunctional roasting cup; the second multifunctional roasting cup is connected to the second venting system and the electric heating system. One end of the multi-functional roasting cup is connected to the electric heating system through gas supply line one; the other end of the multi-functional roasting cup is connected to the electric heating system through gas supply line two; the functions of gas supply line one and gas supply line two are different, mainly changing the flow direction of gas in the material layer, gas supply line one is downward exhaust drying, and gas supply line two is upward blowing drying.

[0021] The pilot-scale roasting system is applicable to processes including but not limited to the following raw material types: the entire process of exploding experiments, forced-air drying, vacuum drying, preheating, roasting and cooling experiments of iron concentrate oxidized pellets; iron ore powder sintering treatment; oxidation or reduction magnetization roasting of refractory minerals such as limonite and magnesite; decarburization of coal gangue; drying treatment of materials containing volatile substances; and sintering process simulation of preparing porous ceramic media from bulk inorganic solid waste such as coal gangue, fly ash, mine tailings, and non-ferrous waste residue.

[0022] Furthermore, the calcination pilot system can perform heating or cooling processes in atmospheres of inert gases such as H2, CO, O2, CO2, N2, and argon, as well as mixtures of the above-mentioned gases.

[0023] Furthermore, the maximum gas flow velocity through the material layer in this calcination pilot system can reach 4.5 m / s, and the flow velocity can be dynamically adjusted during the test.

[0024] Furthermore, the calcination pilot-scale system is equipped with multiple heating programs, and the heating temperature, heating time, and atmosphere of each program can be set independently, with the maximum heating temperature reaching 1500℃.

[0025] Furthermore, the calcination pilot system first heats the material layer, and then performs reduction cooling treatment using a reducing gas, which can be H2, CO, or a mixture of both in any proportion.

[0026] Furthermore, this pilot-scale roasting system can reverse the flow direction of gas flowing through the multifunctional roasting cup at temperatures below 900°C.

[0027] Furthermore, the high-temperature flue gas generator of the roasting pilot system uses natural gas, liquefied petroleum gas or bottled CO as fuel. The high-temperature flue gas generator can be quickly adjusted according to the requirements of gas flow and heating temperature for each stage, ensuring continuous switching of multiple heating processes.

[0028] Furthermore, the multifunctional roasting cup of this pilot roasting system can handle raw materials with a minimum particle size of 200 mesh, and there are no restrictions on the moisture content or volatile content of the raw materials being processed.

[0029] Furthermore, the thickness of the material layer inside the multifunctional roasting cup of this pilot roasting system can be adjusted according to actual needs, with the maximum thickness not exceeding the height of the roasting cup. At the same time, roasting cups of different heights can be replaced as needed for the experiment.

[0030] Furthermore, when the calcination temperature in the pilot-scale system is below 900℃, an electric heating system and a multifunctional calcining cup are used for heating or cooling in reducing, oxidizing, and inert atmospheres.

[0031] Furthermore, when the pilot-scale system uses a roasting temperature higher than 900℃, it employs an electric heating system, a high-temperature flue gas generator, and a multi-functional roasting cup to provide heating or cooling in reducing, oxidizing, and inert atmospheres. The electric heating system and the high-temperature flue gas generator are used in stages. The electric heating system provides heating or cooling in reducing, oxidizing, or inert atmospheres when the roasting temperature is below 900℃; the high-temperature flue gas generator provides heating or cooling in weakly oxidizing or strongly oxidizing atmospheres when the roasting temperature is above 900℃.

[0032] Specific application example 1:

[0033] The iron ore sintering test was conducted using this roasting pilot system. First, the iron ore mixture prepared by the granulation device was placed in the multi-functional roasting cup. Then, the high-temperature flue gas generator was started to ignite the fuel in the sintering mixture using the high-temperature flue gas. The temperature and oxygen content of the hot flue gas generated by the high-temperature flue gas generator were controlled according to the test requirements. At the same time, the induced draft fan was turned on to ventilate. The fan speed was adjusted by the central control system according to the test requirements to ensure that the multi-functional roasting cup and pipeline were under the specified negative pressure.

[0034] Specific application example 2:

[0035] The siderite roasting test was conducted using this pilot roasting system. First, the siderite raw material to be processed was added to the multi-functional roasting cup II. Then, the blower, electric heating system, and gas distribution system were started in sequence. At the same time, the heating regime of the electric heating system was set and the gas composition of the gas distribution system was adjusted. Roasting tests were conducted on the siderite under different atmospheres, different heating rates, different times, and different temperatures. The exhaust gas was discharged through the venting system II.

[0036] Specific application example 3:

[0037] The calcination pilot system was used to conduct dehydration and calcination tests on limonite. First, the limonite raw material to be treated was added to the multi-functional calcination cup II. Then, the blower and the electric heating system were started in sequence. At the same time, the heating regime of the electric heating system was set. Calcination tests were conducted on the limonite under different time, different heating rate and different temperature conditions. The exhaust gas was discharged through the venting system II.

[0038] Specific application example 4:

[0039] The porous ceramic firing test was conducted using this pilot-scale firing system. First, the raw materials for ceramic preparation were added to the multifunctional firing cup. Then, the blower, electric heating system, and gas distribution system were started in sequence to heat the raw materials. When the test temperature reached 900℃, the heating system was switched and the high-temperature flue gas generator was started. The high-temperature flue gas was used to ignite the fuel in the sintering mixture. The temperature and oxygen content of the hot flue gas generated by the high-temperature flue gas generator were controlled according to the test requirements. At the same time, the induced draft fan 6 was turned on for ventilation. The fan speed was adjusted by the central control system according to the test requirements to ensure that the multifunctional firing cup and pipeline were under the specified negative pressure.

[0040] Specific application example 5:

[0041] The coal gangue decarbonization roasting test was conducted using this roasting pilot system. First, the coal gangue raw material to be treated was added to the multi-functional roasting cup II. Then, the blower and electric heating system were started in sequence, and the heating regime of the electric heating system was set. Roasting tests were conducted on the coal gangue under different time, different heating rate and different temperature conditions. The exhaust gas was discharged through the venting system II.

[0042] Specific application example 6:

[0043] This pilot-scale roasting system is used to perform roasting-reduction cooling treatment on low-quality limonite or hematite. First, the low-quality limonite or hematite to be treated is added to a multi-functional roasting cup. Then, the blower and electric heating system are started sequentially, and the heating regime of the electric heating system is set. Roasting tests are conducted on the above raw materials under different time, heating rate, and temperature conditions. After the roasting test is completed, the cleaning system of the pipeline gas supply / cleaning system is started to replace the pipeline system in the multi-functional roasting cup with inert gas to ensure that there is no oxygen in the pipeline. Then, the gas supply system of the pipeline gas supply / cleaning system is switched to blow in cold reducing gas (H2, CO, or a mixture of both in any proportion) to reduce and cool the hot raw materials in the multi-functional roasting cup. The exhaust gas is discharged through the venting system.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A calcination pilot-scale system, characterized in that, include: The system comprises a central control system, a multi-functional roasting cup I, a multi-functional roasting cup II, a high-temperature flue gas generator, a gas supply / purging system, a water cooling system, an induced draft fan, an electric heating system, a gas distribution system, a venting system II, a venting system I, and a blower. The central control system connects to the electric heating system, the high-temperature flue gas generator, and the multi-functional roasting cup I. The central control system is connected to the multi-functional roasting cup I via temperature control. The multi-functional roasting cup I is connected to the gas supply / purging system, the water cooling system, and the venting system I. The water cooling system is connected to the induced draft fan. The electric heating system connects to the blower, the gas distribution system, and both the multi-functional roasting cup I and the multi-functional roasting cup II. The multi-functional roasting cup II is connected to the venting system II and the electric heating system.

2. The calcination pilot-scale system as described in claim 1, characterized in that, The central control system is connected to the high-temperature flue gas generator via system control; the multi-functional roasting cup is connected to the water cooling system via the gas outlet pipe.

3. The calcination pilot-scale system as described in claim 2, characterized in that, One end of the multi-functional roasting cup is connected to the electric heating system via gas supply line one; the other end of the multi-functional roasting cup is connected to the electric heating system via gas supply line two; wherein, gas supply line one is used for downward exhaust drying, and gas supply line two is used for upward blowing drying.

4. The calcination pilot-scale system as described in claim 3, characterized in that, The high-temperature flue gas generator uses natural gas, liquefied petroleum gas, or bottled CO as fuel. The high-temperature flue gas generator dynamically adjusts online according to the gas flow rate and heating temperature requirements of each section.

5. The calcination pilot-scale system as described in claim 3, characterized in that, The calcination pilot plant can perform heating or cooling processes in atmospheres of H2, CO, O2, CO2, N2, argon inert gas, and mixtures of different gases.

6. The calcination pilot-scale system as described in claim 5, characterized in that, When the calcination temperature of the pilot-scale system is below 900℃, an electric heating system and a multi-functional roasting cup are used for heating or cooling in reducing, oxidizing, and inert atmospheres.

7. The calcination pilot-scale system as described in claim 6, characterized in that, When the pilot-scale system is used at a roasting temperature above 900℃, an electric heating system, a high-temperature flue gas generator, and a multi-functional roasting cup are used for heating or cooling in reducing, oxidizing, and inert atmospheres. The electric heating system and the high-temperature flue gas generator are used in stages. The electric heating system is used to provide heating or cooling in reducing, oxidizing, or inert atmospheres when the roasting temperature is below 900℃. The high-temperature flue gas generator is used to provide heating or cooling in weakly oxidizing or strongly oxidizing atmospheres when the roasting temperature is above 900℃.

8. The calcination pilot-scale system as described in claim 2, characterized in that, The roasting pilot-scale system is applicable to the following processes: the entire process of iron concentrate oxidized pellet bursting experiment, forced air drying, vacuum drying, preheating, roasting and cooling experiment; iron ore powder sintering treatment; oxidation or reduction magnetization roasting of refractory minerals such as limonite and magnesite; coal gangue decarburization; drying treatment of materials containing volatile substances; and sintering process simulation of bulk inorganic solid waste such as coal gangue, fly ash, mine tailings and non-ferrous waste to prepare porous ceramic media.

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