Roasting pilot plant test system

Abstract

The invention 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, 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] The invention belongs to the technical fields of chemical engineering, solid waste treatment, thermal engineering and roasting process, and in particular relates to a roasting pilot system. Background Art

[0002] Industrial or agricultural production processes such as metallurgy, chemical industry, building materials, electricity, and grain processing often involve the reaction process of a large number of bulk materials and gaseous media, such as drying and dehydration, drying, preheating, constant temperature roasting, continuous heating process, or heating and cooling treatment under a protective atmosphere. At present, the research and practice in this area are completed through laboratory tests and industrial practices, but the key processes such as the selection of process parameters often rely on experience or fluid mechanics calculation simulation. As we all know, the two-phase mass transfer and heat transfer between fluid and solid particles have always been a hot topic in industrial research. How to improve the waste heat recovery efficiency in the industrial field, develop new heat exchange equipment, and improve the mass-heat transfer method are the restrictive links that need to be overcome. Therefore, the development of pilot-scale simulation equipment that can accurately simulate the heat exchange between gas and solid phases in industrial processes, and the coupling analysis of the simulation results of the process with the results of fluid mechanics calculations, can provide theoretical and technical support for the selection of key process parameters in industrial processes, which has important theoretical and practical significance. Summary of the invention

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

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

[0005] A roasting pilot system comprises: a central control system, a multifunctional roasting cup 1, a multifunctional roasting cup 2, a high-temperature flue gas generating device, an air supply / cleaning system, a water cooling system, an induced draft fan, an electric heating system, an air distribution system, a dispersing system 2, a dispersing system 1, and a blower; wherein the central control system is connected to the electric heating system, the high-temperature flue gas generating device and the multifunctional roasting cup 1; the central control system is connected to the multifunctional roasting cup 1 through temperature control; the multifunctional roasting cup 1 is connected to the air supply / cleaning system, the water cooling system, and the dispersing system 1, and the water cooling system is connected to the induced draft fan; the electric heating system is connected to the blower, the air distribution system and the multifunctional roasting cup 1 and the multifunctional roasting cup 2; the multifunctional roasting cup 2 is connected to the dispersing system 2 and the electric heating system.

[0006] Preferably, the central control system is connected to the high-temperature flue gas generating device through system control; the central control system is connected to the multifunctional roasting cup 1 through temperature control; the multifunctional roasting cup 1 is connected to the water cooling system through the air outlet pipe 1.

[0007] Preferably, one end of the multifunctional roasting beaker 1 is connected to the electric heating system through the air supply pipeline 1; the other end of the multifunctional roasting beaker 1 is connected to the electric heating system through the air supply pipeline 2; wherein, the air supply pipeline 1 is used for downward air extraction and drying, and the air supply pipeline 2 is used for upward air blowing and drying.

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

[0009] Preferably, during roasting in the pilot system, H 2 , CO, O 2 , CO 2 , N 2 , argon inert gas, and heating or cooling treatment processes under the atmosphere of mixed gases composed of the above different gases can be carried out.

[0010] Preferably, when the roasting temperature used in the pilot system is lower than 900 °C, an electric heating system and a multifunctional roasting beaker 2 are used for heating or cooling treatment in a reducing atmosphere, an oxidizing atmosphere and an inert atmosphere.

[0011] Preferably, when the roasting temperature used in the pilot system is higher than 900 °C, an electric heating system, a high-temperature flue gas generating device and a multifunctional roasting beaker 1 are used for heating or cooling treatment in a reducing atmosphere, an oxidizing atmosphere and an inert atmosphere; wherein, the electric heating system and the high-temperature flue gas generating device are heated in sections. The electric heating system is used for providing heating or cooling treatment in a reducing, oxidizing or inert atmosphere when the roasting temperature is lower than 900 °C; the high-temperature flue gas generating device is used for providing heating or cooling treatment in a weakly oxidizing or strongly oxidizing atmosphere when the roasting temperature is higher than 900 °C.

[0012] Preferably, the processes applicable to the roasting pilot system include: the whole process of bursting experiments of iron ore concentrate oxidized pellets, air blowing drying, air extraction drying, preheating, roasting and cooling experiments, iron ore powder sintering treatment, oxidation or reduction magnetization roasting of difficult ore types such as limonite and magnesite iron ore, coal gangue decarbonization, drying treatment of materials containing volatile substances, and simulation of the sintering process for preparing porous ceramic media from bulk inorganic solid wastes such as coal gangue, fly ash, mine tailings and non-ferrous waste residues.

[0013] The present invention can achieve adjustable and controllable atmosphere, temperature and flow rate; it can carry out heating and cooling treatment on a certain thickness of material layer formed by bulk materials under the protection of an oxidizing, reducing or inert atmosphere. At the same time, the flow rate of the gas flowing through the material layer can be regulated during the heating or cooling treatment process, and the temperature inside the material layer can be monitored; by matching with the granulation system, the roasting processes of different materials can be simulated; key process parameters are provided for industrial design, and theoretical and technical support is provided for subsequent improvement. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0015] Figure 1 It is a schematic structural diagram of the roasting pilot system of the embodiment of the present invention;

[0016] Among them, 1 - central control system, 10 - multifunctional roasting cup 1, 2 - multifunctional roasting cup 2, 9 - high-temperature flue gas generating device, 8 - air supply / sweeping system, 7 - water cooling system, 6 - induced draft fan, 3 - electric heating system, 4 - gas distribution system, blow-off system 2, blow-off system 1, 5 - blower. Specific embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

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

[0019] Embodiment 1:

[0020] Such as Figure 1As shown in the figure, an embodiment of the present invention provides a multi-functional roasting pilot system, including: a central control system, multi-functional roasting cup 1, multi-functional roasting cup 2, a high-temperature flue gas generating device, a gas supply / sweeping system, a water cooling system, a draft fan, an electric heating system, a gas distribution system, a blow-off system 2, a blow-off system 1, and a blower; wherein, the central control system is connected to the electric heating system, the high-temperature flue gas generating device and multi-functional roasting cup 1, the high-temperature flue gas generating device is connected to multi-functional roasting cup 1 through a gas supply pipeline 3, and the central control system is connected to the high-temperature flue gas generating device through system control; the central control system is connected to multi-functional roasting cup 1 through temperature control; multi-functional roasting cup 1 is connected to the gas supply / sweeping system, the water cooling system, and the blow-off system 1, and the water cooling system is connected to the draft fan; multi-functional roasting cup 1 is connected to the cold system through an air outlet pipeline 1; the electric heating system is connected to the blower, the gas distribution system, multi-functional roasting cup 1 and multi-functional roasting cup 2; multi-functional roasting cup 2 is connected to the blow-off system 2 and the electric heating system. One end of multi-functional roasting cup 1 is connected to the electric heating system through a gas supply pipeline 1; the other end of multi-functional roasting cup 1 is connected to the electric heating system through a gas supply pipeline 2; the functions of gas supply pipeline 1 and gas supply pipeline 2 are different, mainly changing the flow direction of gas in the material layer. Gas supply pipeline 1 is for downward suction drying, and gas supply pipeline 2 is for upward blowing drying.

[0021] The processes applicable to be processed by this roasting pilot system include but are not limited to the following raw material types: the whole process of bursting experiment of iron concentrate oxidized pellets, blowing drying, suction drying, preheating, roasting and cooling experiments, iron ore powder sintering treatment, oxidation or reduction magnetization roasting of refractory ore types such as limonite and magnesite iron ore, decarbonization of coal gangue, drying treatment of materials containing volatile substances, and sintering process simulation for preparing porous ceramic media from bulk inorganic solid wastes such as coal gangue, fly ash, mine tailings, and non-ferrous waste residues.

[0022] Further, this roasting pilot system can carry out heating or cooling processes in an atmosphere of H 2 、CO、O 2 、CO 2 、N 2 、inert gases such as argon, and mixed gases composed of the above different gases.

[0023] Further, the gas flow rate flowing through the material layer in this roasting pilot system can reach a maximum of 4.5 m / s, and the flow rate can be dynamically adjusted during the test process.

[0024] Further, this roasting pilot system sets multi-stage heating programs, and the heating temperature, heating time and atmosphere of each stage can be set separately, and the highest heating temperature can reach 1500 °C.

[0025] Further, this roasting pilot system first heats the material layer, and then conducts reduction cooling treatment with a reducing gas. The reducing gas can be H 2A mixed gas of CO or both in any proportion.

[0026] Furthermore, the flow direction of the gas flowing through the multi-functional roasting beaker can be switched in the roasting pilot system below 900°C.

[0027] Furthermore, the high-temperature flue gas generating device of the roasting pilot system uses natural gas, liquefied petroleum gas or canned CO as fuel. The high-temperature flue gas generating device can be quickly adjusted according to the requirements of the gas flow rate and heating temperature of each section to ensure continuous switching of the multi-section heating process.

[0028] Furthermore, the minimum particle size range of the raw materials that can be processed in the multi-functional roasting beaker of the roasting pilot system can reach 200 mesh, and there are no restrictions on the water content and volatile content of the processed raw materials.

[0029] Furthermore, the thickness of the material layer in the multi-functional roasting beaker of the roasting pilot system is adjusted according to actual needs, and the maximum thickness does not exceed the height of the roasting beaker. At the same time, roasting beakers of different heights are replaced according to the test needs.

[0030] Furthermore, when the roasting temperature used in the pilot system is lower than 900°C, an electric heating system and the multi-functional roasting beaker 2 are used for heating or cooling treatment in a reducing atmosphere, an oxidizing atmosphere and an inert atmosphere.

[0031] Furthermore, when the roasting temperature used in the pilot system is higher than 900°C, an electric heating system, a high-temperature flue gas generating device and the multi-functional roasting beaker 1 are used for heating or cooling treatment in a reducing atmosphere, an oxidizing atmosphere and an inert atmosphere; among them, the electric heating system and the high-temperature flue gas generating device are heated in sections. The electric heating system is used to provide heating or cooling treatment in a reducing, oxidizing or inert atmosphere when the roasting temperature is lower than 900°C; the high-temperature flue gas generating device is used to provide heating or cooling treatment in a weakly oxidizing or strongly oxidizing atmosphere when the roasting temperature is higher than 900°C.

[0032] Specific application example 1:

[0033] Apply this roasting pilot system to conduct an iron ore sintering test. First, arrange the iron ore mixture prepared by the granulating device in the multi-functional roasting beaker 1, then start the high-temperature flue gas generating device, use the high-temperature flue gas to ignite the fuel in the sintering mixture, control the temperature and oxygen content of the hot flue gas generated by the high-temperature flue gas generating device according to the test requirements, and at the same time turn on the induced draft fan for air extraction. Adjust the fan speed by the central control system according to the test requirements to ensure a specified negative pressure state in the multi-functional roasting beaker and the pipeline.

[0034] Specific application example 2:

[0035] Apply this roasting pilot system to conduct roasting tests on siderite. First, add the siderite raw material to be processed into the multi-functional roasting beaker 2. Then, start the blower, electric heating system, and gas distribution system in sequence. At the same time, set the heating rate regime of the electric heating system, adjust the gas composition of the gas distribution system, and conduct roasting tests on siderite under different atmospheres, different heating rates, different times, and different temperatures. The tail gas is discharged by the blow-off system 2.

[0036] Specific application example 3:

[0037] Apply this roasting pilot system to conduct dehydration and roasting tests on limonite. First, add the limonite raw material to be processed into the multi-functional roasting beaker 2. Then, start the blower and electric heating system in sequence. At the same time, set the heating rate regime of the electric heating system, and conduct roasting tests on limonite under different times, different heating rates, and different temperatures. The tail gas is discharged by the blow-off system 2.

[0038] Specific application example 4:

[0039] Apply this roasting pilot system to conduct porous ceramic firing tests. First, add the raw materials for ceramic preparation to be processed into the multi-functional roasting beaker 1. Then, start the blower, electric heating system, and gas distribution system in sequence to heat-treat the raw materials. After the test temperature reaches 900 °C, switch the heating system, start the high-temperature flue gas generating device, and use the high-temperature flue gas to ignite the fuel in the sintered mixture. Control the temperature and oxygen content of the hot flue gas generated by the high-temperature flue gas generating device according to the test requirements. At the same time, start the induced draft fan 6 to draw air, and adjust the fan speed by the central control system according to the test requirements to ensure that the multi-functional roasting beaker and the pipeline are in a specified negative pressure state.

[0040] Specific application example 5:

[0041] Apply this roasting pilot system to conduct decarbonization roasting tests on coal gangue. First, add the coal gangue raw material to be processed into the multi-functional roasting beaker 2. Then, start the blower and electric heating system in sequence. At the same time, set the heating rate regime of the electric heating system, and conduct roasting tests on coal gangue under different times, different heating rates, and different temperatures. The tail gas is discharged by the blow-off system 2.

[0042] Specific application example 6:

[0043] Using this roasting pilot system to carry out roasting-reduction cooling treatment on low-quality limonite or hematite, etc. First, add the low-quality limonite or hematite to be processed into the multi-functional roasting cup 1, then start the blower and the electric heating system in sequence, and at the same time set the heating-up system of the electric heating system to conduct roasting tests on the above raw materials under different times, different heating rates, and different temperature conditions. When the roasting test is over, start the cleaning system of the pipeline gas supply / cleaning system to conduct inert gas replacement on the pipeline system in the multi-functional roasting cup 1 to ensure that there is no oxygen in the pipeline, and then switch to the gas supply system of the pipeline gas supply / cleaning system to blow in cold reducing gas (H 2 , CO or a mixed gas of any ratio of the two) to conduct reduction cooling treatment on the hot raw materials in the multi-functional roasting cup 1, and the tail gas is discharged by the blow-off system 1.

[0044] The above embodiments are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A roasting pilot system, characterized in that: include: Central control system, multifunctional roasting cup 1, multifunctional roasting cup 2, high-temperature flue gas generating device, air supply / cleaning system, water cooling system, induced draft fan, electric heating system, gas distribution system, dispersion system 2, dispersion system 1, blower; wherein, the central control system is connected to the electric heating system, the high-temperature flue gas generating device and the multifunctional roasting cup 1; the central control system is connected to the multifunctional roasting cup 1 through temperature control; the multifunctional roasting cup 1 is connected to the air supply / cleaning system, the water cooling system, the dispersion system 1, and 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 1 and the multifunctional roasting cup 2; the multifunctional roasting cup 2 is connected to the dispersion system 2 and the electric heating system.

2. The multifunctional roasting pilot system according to claim 1, characterized in that: The central control system is connected to the high-temperature flue gas generating device through system control; the central control system is connected to the multifunctional roasting cup 1 through temperature control; The multifunctional roasting cup 1 is connected to the water cooling system through the air outlet pipeline 1.

3. The multifunctional roasting pilot system according to claim 2, characterized in that: One end of the multifunctional roasting cup 1 is connected to the electric heating system through the air supply pipeline 1; the other end of the multifunctional roasting cup 1 is connected to the electric heating system through the air supply pipeline 2; wherein the air supply pipeline 1 is used for downward exhaust drying, and the air supply pipeline 2 is used for upward blast drying.

4. The multifunctional roasting pilot system according to claim 3, characterized in that: The high-temperature flue gas generating device uses natural gas, liquefied petroleum gas or bottled CO as fuel. The high-temperature flue gas generating device is dynamically adjusted online according to the requirements of each section of gas flow and heating temperature.

5. The multifunctional roasting pilot system according to claim 3, characterized in that: The roasting pilot system can carry out heating or cooling processes under the atmosphere of H2, CO, O2, CO2, N2, argon inert gas, and mixed gases composed of the above different gases.

6. The multifunctional roasting pilot system according to claim 5, characterized in that: When the pilot system uses a roasting temperature lower than 900° C., the electric heating system and the multifunctional roasting cup 2 are used to perform heating or cooling treatment in a reducing atmosphere, an oxidizing atmosphere, and an inert atmosphere.

7. The multifunctional roasting pilot system according to claim 6, characterized in that: When the pilot system uses a roasting temperature higher than 900°C, an electric heating system, a high-temperature flue gas generating device and a multifunctional roasting cup 1 are used to perform heating or cooling treatment in a reducing atmosphere, an oxidizing atmosphere and an inert atmosphere; wherein the electric heating system and the high-temperature flue gas generating device are heated in sections, and the electric heating system is used to provide heating or cooling treatment in a reducing, oxidizing or inert atmosphere when the roasting temperature is lower than 900°C; the high-temperature flue gas generating device is used to provide heating or cooling treatment in a weakly oxidizing or strongly oxidizing atmosphere when the roasting temperature is higher than 900°C.

8. The multifunctional roasting pilot system according to claim 2, characterized in that: The roasting pilot system is applicable to the following processes: explosion test of iron ore concentrate oxidized pellets, the whole process of blast drying, exhaust drying, preheating, roasting and cooling experiments, sintering of iron ore powder, oxidation or reduction magnetization roasting of refractory ores such as limonite and magnesite, decarbonization of coal gangue, drying of materials containing volatile substances, and sintering process simulation of porous ceramic media prepared from large inorganic solid wastes such as coal gangue, fly ash, mine tailings and non-ferrous waste.

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