A preheating and cooling integrated roasting furnace system
By adopting the indirect heat exchange technology of integrated preheating and cooling in the roasting furnace system, the problems of long construction cycle, high difficulty and high cost of traditional systems are solved, and the process flow and system height are shortened.
Patent Information
- Application Number
- CN202411869883.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-04-04
AI Technical Summary
Traditional roasting furnace systems require multi-stage preheating cyclones and cooling cyclones, resulting in long construction cycles, high difficulty and high cost.
The preheating and cooling integrated roasting furnace system is adopted to achieve the integration of preheating and cooling by indirect heat exchange between the cold material and the cold air mixture of cold air with the roasted high-temperature baked sand and high-temperature flue gas.
The process flow has been greatly shortened, the height of the roasting furnace system has been significantly reduced, and the construction cycle, difficulty and cost have been effectively shortened.
Smart Images
Figure CN119755991A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preheating and cooling integrated roasting furnace system. Background Art
[0002] The suspension roasting furnace has a series of advantages such as fast heat exchange between gas and solid, uniform temperature within the layer, good product quality, high production efficiency and simple operation. Therefore, it is widely used in non-ferrous metallurgy, building materials, steel metallurgy and other fields.
[0003] At present, the typical process of the roasting furnace system is: ①, the hot flue gas and hot roasted sand after roasting are separated into gas and solid in the cyclone separation drum; ②, the hot flue gas after separation is directly heat exchanged with the cold material in the preheating cyclone, and the preheated material enters the main furnace for roasting; ③, the hot roasted sand after roasting is directly heat exchanged with the cold air in the cooling cyclone, and the roasted sand is sent to the downstream process after cooling, and the preheated air enters the main furnace.
[0004] However, since the traditional roasting furnace system requires the use of multiple stages of preheating cyclones and cooling cyclones, and the inner walls of each stage of the preheating cyclone and cooling cyclone need to be built with refractory bricks and installed with insulation blocks, the height of the roasting furnace system can reach about 60 meters, resulting in a long construction period, great construction difficulty and high construction cost. Summary of the invention
[0005] In view of the problems existing in the prior art, the present invention provides a preheating and cooling integrated roasting furnace system, which performs indirect heat exchange between a cold air-material mixture of cold materials and cold air and a high-temperature gas-material mixture of high-temperature roasted sand and high-temperature flue gas after roasting, thereby realizing integrated preheating and cooling, and abandoning the traditional method of separating the high-temperature roasted sand from the high-temperature flue gas and then preheating the cold air and the cold materials separately, thereby greatly shortening the process flow, significantly reducing the height of the roasting furnace system, and effectively shortening the construction period, construction difficulty and construction cost.
[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a preheating and cooling integrated roasting furnace system, comprising a suspension roasting main reaction furnace, a heat exchanger, a burner, a cyclone separator, a bag dust collector and an induced draft fan; the high-temperature flue gas inlet of the suspension roasting main reaction furnace is connected to the high-temperature flue gas outlet of the burner, the fuel inlet of the burner is used to introduce fuel, and the air inlet of the burner is used to introduce combustion-supporting air; the gas outlet of the suspension roasting main reaction furnace is connected to the high-temperature medium inlet of the heat exchanger, and the high-temperature The medium outlet is connected with the gas material inlet of the cyclone separator, the gas outlet of the cyclone separator is connected with the feed port of the bag dust collector, the gas outlet of the bag dust collector is connected with the gas inlet of the induced draft fan, and the gas outlet of the induced draft fan is used to discharge purified tail gas; the discharge port of the cyclone separator is used to discharge cooled roasted sand; the dust discharge port of the bag dust collector is used to discharge cooled roasted sand; the low-temperature medium inlet of the heat exchanger is used to introduce cold air and cold materials, and the low-temperature medium outlet of the heat exchanger is connected with the gas material inlet of the suspended roasting main reactor.
[0007] The fuel inlet of the burner is connected to a first pipeline, and a first valve is installed on the first pipeline. The fuel enters the burner through the first pipeline, and the supply amount of the fuel is adjusted by the first valve.
[0008] The air inlet of the burner is connected to a second pipe, on which a second valve is installed. The combustion-supporting air enters the burner through the second pipe, and the supply amount of the combustion-supporting air is adjusted by the second valve.
[0009] The high temperature flue gas inlet of the suspension roasting main reaction furnace is connected to the high temperature flue gas outlet of the burner through a third pipeline, and the gas outlet of the suspension roasting main reaction furnace is connected to the high temperature medium inlet of the heat exchanger through a fourth pipeline.
[0010] The high-temperature medium outlet of the heat exchanger is connected to the gas inlet of the cyclone separator through a fifth pipeline, and the gas outlet of the cyclone separator is connected to the feed inlet of the bag filter through a sixth pipeline.
[0011] The air outlet of the bag filter is connected to the air inlet of the induced draft fan through a seventh pipe, an eighth pipe is installed at the air outlet of the induced draft fan, and the purified exhaust gas is discharged through the eighth pipe.
[0012] A ninth pipe is installed at the discharge port of the cyclone separator, and the cooled roasted sand is discharged through the ninth pipe; a tenth pipe is installed at the dust discharge port of the bag filter, and the tenth pipe is connected with the ninth pipe.
[0013] The gas material inlet of the suspension roasting main reaction furnace and the low-temperature medium outlet of the heat exchanger are connected through an eleventh pipeline.
[0014] A twelfth pipeline is installed at the low-temperature medium inlet of the heat exchanger, and the cold air enters the heat exchanger through the twelfth pipeline. A third valve is installed on the twelfth pipeline, and the air supply of the cold air is adjusted by the third valve.
[0015] The twelfth pipeline is connected to the thirteenth pipeline, and the cold material enters the heat exchanger through the thirteenth pipeline and the twelfth pipeline.
[0016] Beneficial effects of the present invention:
[0017] The preheating and cooling integrated roasting furnace system of the present invention performs indirect heat exchange between a cold air-material mixture of cold materials and cold air and a high-temperature gas-material mixture of high-temperature roasted sand and high-temperature flue gas after roasting, thereby realizing preheating and cooling integration, and abandoning the traditional method of separating the high-temperature roasted sand from the high-temperature flue gas and then preheating the cold air and cold materials separately, thereby greatly shortening the process flow, significantly reducing the height of the roasting furnace system, and effectively shortening the construction period, construction difficulty and construction cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural principle diagram of a preheating and cooling integrated roasting furnace system of the present invention;
[0019] In the figure, 1 is the main reaction furnace for suspension roasting, 2 is the heat exchanger, 3 is the burner, 4 is the cyclone separator, 5 is the bag filter, 6 is the induced draft fan, 7 is the first pipeline, 8 is the first valve, 9 is the second pipeline, 10 is the second valve, 11 is the third pipeline, 12 is the fourth pipeline, 13 is the fifth pipeline, 14 is the sixth pipeline, 15 is the seventh pipeline, 16 is the eighth pipeline, 17 is the ninth pipeline, 18 is the tenth pipeline, 19 is the eleventh pipeline, 20 is the twelfth pipeline, 21 is the third valve, 22 is the thirteenth pipeline, A is the fuel, B is the combustion-supporting air, C is the purified tail gas, D is the cooling roasted sand, E is the cold air, and F is the cold material. DETAILED DESCRIPTION
[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0021] like Figure 1As shown, a preheating and cooling integrated roasting furnace system includes a suspension roasting main reaction furnace 1, a heat exchanger 2, a burner 3, a cyclone separator 4, a bag dust collector 5 and an induced draft fan 6; the high-temperature flue gas inlet of the suspension roasting main reaction furnace 1 is connected to the high-temperature flue gas outlet of the burner 3, the fuel inlet of the burner 3 is used to introduce fuel A, and the air inlet of the burner 3 is used to introduce combustion-supporting air B; the gas outlet of the suspension roasting main reaction furnace 1 is connected to the high-temperature medium inlet of the heat exchanger 2, and the high-temperature medium outlet of the heat exchanger 2 is connected to the cyclone separator 6. The gas inlet of the heat exchanger 4 is connected, the gas outlet of the cyclone separator 4 is connected with the feed port of the bag dust collector 5, the gas outlet of the bag dust collector 5 is connected with the air inlet of the induced draft fan 6, and the gas outlet of the induced draft fan 6 is used to discharge the purified tail gas C; the discharge port of the cyclone separator 4 is used to discharge the cooled roasted sand D; the dust discharge port of the bag dust collector 5 is used to discharge the cooled roasted sand D; the low-temperature medium inlet of the heat exchanger 2 is used to introduce cold air E and cold material F, and the low-temperature medium outlet of the heat exchanger 2 is connected with the gas inlet of the suspension roasting main reaction furnace 1.
[0022] The fuel inlet of the burner 3 is connected to a first pipe 7 , on which a first valve 8 is installed. The fuel A enters the burner 3 through the first pipe 7 , and the supply amount of the fuel A is adjusted by the first valve 8 .
[0023] The air inlet of the burner 3 is connected to a second pipe 9 , on which a second valve 10 is installed. The combustion air B enters the burner 3 through the second pipe 9 , and the air supply of the combustion air B is adjusted by the second valve 10 .
[0024] The high-temperature flue gas inlet of the suspension roasting main reaction furnace 1 is connected to the high-temperature flue gas outlet of the burner 3 through a third pipe 11, and the gas outlet of the suspension roasting main reaction furnace 1 is connected to the high-temperature medium inlet of the heat exchanger 2 through a fourth pipe 12.
[0025] The high-temperature medium outlet of the heat exchanger 2 is connected to the gas inlet of the cyclone separator 4 via a fifth pipeline 13 , and the gas outlet of the cyclone separator 4 is connected to the feed inlet of the bag filter 5 via a sixth pipeline 14 .
[0026] The air outlet of the bag filter 5 is connected to the air inlet of the induced draft fan 6 through a seventh pipe 15 . An eighth pipe 16 is installed at the air outlet of the induced draft fan 6 . The purified exhaust gas C is discharged through the eighth pipe 16 .
[0027] A ninth pipe 17 is installed at the discharge port of the cyclone separator 4 , and the cooled roasted sand D is discharged through the ninth pipe 17 ; a tenth pipe 18 is installed at the dust discharge port of the bag filter 5 , and the tenth pipe 18 is connected to the ninth pipe 17 .
[0028] The gas material inlet of the suspension roasting main reaction furnace 1 and the low-temperature medium outlet of the heat exchanger 2 are connected via an eleventh pipeline 19 .
[0029] A twelfth pipeline 20 is installed at the low-temperature medium inlet of the heat exchanger 2, and the cold air E enters the heat exchanger 2 through the twelfth pipeline 20. A third valve 21 is installed on the twelfth pipeline 20, and the air supply of the cold air E is adjusted by the third valve 21.
[0030] The twelfth pipeline 20 is connected to a thirteenth pipeline 22 , and the cold material F enters the heat exchanger 2 through the thirteenth pipeline 22 and the twelfth pipeline 20 .
[0031] The following describes a one-time use process of the present invention in conjunction with the accompanying drawings:
[0032] Embodiment 1
[0033] Fuel A is methane, and the flow rate of fuel A is 2000Nm 3 / h~3000Nm 3 / h, fuel A and combustion-supporting air B are mixed and ignited in the burner 3, and the high-temperature flue gas generated first enters the suspension roasting main reaction furnace 1, and is then discharged through the heat exchanger 2, cyclone separator 4, bag filter 5 and induced draft fan 6 in sequence.
[0034] The cold material F is room temperature mineral powder, and the flow rate of cold material F is 200t / h; the cold air E is room temperature air, and the flow rate is 80000Nm 3 / h~100000Nm 3 / h; the cold material F is mixed with the cold air E to form a normal temperature gas-material mixture, and the normal temperature gas-material mixture enters the heat exchanger 2 to exchange heat with the high temperature flue gas, thereby realizing preheating of the gas-material mixture. The temperature of the preheated gas-material mixture is 300°C to 400°C. Subsequently, the preheated gas-material mixture enters the suspension roasting main reactor 1 and is mixed with the high temperature flue gas to realize roasting, and finally forms high temperature roasted sand. At this time, the temperature of the high temperature roasted sand and the high temperature flue gas is 600°C to 700°C.
[0035] When roasting is completed, the high-temperature roasted sand and the high-temperature flue gas enter the heat exchanger 2 together, and perform heat exchange with the subsequent normal-temperature gas-material mixture in the heat exchanger 2, thereby realizing continuous preheating of the gas-material mixture. At the same time, the roasted sand and the flue gas that have completed the heat exchange are cooled. The temperature of the roasted sand and the flue gas after cooling is 100°C to 200°C.
[0036] When the roasted sand and flue gas are cooled, they will enter the cyclone separator 4 for gas-solid separation, and the separated solid phase is the cooled roasted sand D, which directly enters the subsequent process. At the same time, the separated gas phase is dusty flue gas, which will enter the bag filter 5, and the dust in the dusty flue gas will be blocked in the bag filter 5, and further discharged from the bag filter 5 and enter the subsequent process together with the cooled roasted sand D discharged from the cyclone separator 4. The purified tail gas C after dust removal can be discharged externally through the induced draft fan 6.
[0037] Among them, the floor area of heat exchanger 2 is 200m 2 The height of the heat exchanger 2 is 1m to 2m. When the roasting furnace system adopts the solution of the present invention, the height of the roasting furnace system can be reduced to about 40 meters, which can effectively shorten the construction period, construction difficulty and construction cost.
[0038] Embodiment 2
[0039] Fuel A is methane, and the flow rate of fuel A is 1800Nm 3 / h~2500Nm 3 / h, fuel A and combustion-supporting air B are mixed and ignited in the burner 3, and the high-temperature flue gas generated first enters the suspension roasting main reaction furnace 1, and is then discharged through the heat exchanger 2, cyclone separator 4, bag filter 5 and induced draft fan 6 in sequence.
[0040] The cold material F is room temperature mineral powder, and the flow rate of cold material F is 160t / h; the cold air E is room temperature air, and the flow rate is 50000Nm 3 / h~60000Nm 3 / h; the cold material F is mixed with the cold air E to form a normal temperature gas-material mixture, and the normal temperature gas-material mixture enters the heat exchanger 2 to exchange heat with the high temperature flue gas, thereby realizing preheating of the gas-material mixture. The temperature of the preheated gas-material mixture is 400°C to 500°C. Subsequently, the preheated gas-material mixture enters the suspension roasting main reactor 1 and is mixed with the high temperature flue gas to realize roasting, and finally forms high temperature roasted sand. At this time, the temperature of the high temperature roasted sand and the high temperature flue gas is 650°C to 700°C.
[0041] When roasting is completed, the high-temperature roasted sand and the high-temperature flue gas enter the heat exchanger 2 together, and perform heat exchange with the subsequent normal-temperature gas-material mixture in the heat exchanger 2, thereby realizing continuous preheating of the gas-material mixture. At the same time, the roasted sand and the flue gas that have completed the heat exchange are cooled. The temperature of the roasted sand and the flue gas after cooling is 100°C to 150°C.
[0042] When the roasted sand and flue gas are cooled, they will enter the cyclone separator 4 for gas-solid separation, and the separated solid phase is the cooled roasted sand D, which directly enters the subsequent process. At the same time, the separated gas phase is dusty flue gas, which will enter the bag filter 5, and the dust in the dusty flue gas will be blocked in the bag filter 5, and further discharged from the bag filter 5 and enter the subsequent process together with the cooled roasted sand D discharged from the cyclone separator 4. The purified tail gas C after dust removal can be discharged externally through the induced draft fan 6.
[0043] Among them, the floor area of heat exchanger 2 is 200m 2 The height of the heat exchanger 2 is 1m to 2m. When the roasting furnace system adopts the solution of the present invention, the height of the roasting furnace system can be reduced to about 40 meters, which can effectively shorten the construction period, construction difficulty and construction cost.
[0044] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.
Claims
1. A preheating and cooling integrated roasting furnace system, characterized in that: It includes a suspension roasting main reaction furnace, a heat exchanger, a burner, a cyclone separator, a bag dust collector and an induced draft fan; the high-temperature flue gas inlet of the suspension roasting main reaction furnace is connected with the high-temperature flue gas outlet of the burner, the fuel inlet of the burner is used to introduce fuel, and the air inlet of the burner is used to introduce combustion-supporting air; the gas outlet of the suspension roasting main reaction furnace is connected with the high-temperature medium inlet of the heat exchanger, the high-temperature medium outlet of the heat exchanger is connected with the gas inlet of the cyclone separator, the air outlet of the cyclone separator is connected with the feed inlet of the bag dust collector, the air outlet of the bag dust collector is connected with the air inlet of the induced draft fan, and the air outlet of the induced draft fan is used to discharge purified tail gas; the discharge port of the cyclone separator is used to discharge cooled roasted sand; the dust discharge port of the bag dust collector is used to discharge cooled roasted sand; the low-temperature medium inlet of the heat exchanger is used to introduce cold air and cold materials, and the low-temperature medium outlet of the heat exchanger is connected with the gas inlet of the suspension roasting main reaction furnace.
2. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: The fuel inlet of the burner is connected to a first pipeline, and a first valve is installed on the first pipeline. The fuel enters the burner through the first pipeline, and the supply amount of the fuel is adjusted by the first valve.
3. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: The air inlet of the burner is connected to a second pipe, on which a second valve is installed. The combustion-supporting air enters the burner through the second pipe, and the supply amount of the combustion-supporting air is adjusted by the second valve.
4. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: The high-temperature flue gas inlet of the suspension roasting main reaction furnace is connected to the high-temperature flue gas outlet of the burner through a third pipeline, and the gas outlet of the suspension roasting main reaction furnace is connected to the high-temperature medium inlet of the heat exchanger through a fourth pipeline.
5. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: The high-temperature medium outlet of the heat exchanger is connected to the gas inlet of the cyclone separator through a fifth pipeline, and the gas outlet of the cyclone separator is connected to the feed inlet of the bag filter through a sixth pipeline.
6. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: The air outlet of the bag filter is connected to the air inlet of the induced draft fan through a seventh pipe, an eighth pipe is installed at the air outlet of the induced draft fan, and the purified exhaust gas is discharged through the eighth pipe.
7. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: A ninth pipe is installed at the discharge port of the cyclone separator, and the cooled roasted sand is discharged through the ninth pipe; a tenth pipe is installed at the dust discharge port of the bag filter, and the tenth pipe is connected to the ninth pipe.
8. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: The gas material inlet of the suspension roasting main reaction furnace and the low-temperature medium outlet of the heat exchanger are connected through an eleventh pipeline.
9. The preheating and cooling integrated roasting furnace system according to claim 1, characterized in that: A twelfth pipeline is installed at the low-temperature medium inlet of the heat exchanger, and the cold air enters the heat exchanger through the twelfth pipeline. A third valve is installed on the twelfth pipeline, and the air supply of the cold air is adjusted by the third valve.
10. The preheating and cooling integrated roasting furnace system according to claim 9, characterized in that: The twelfth pipeline is connected to the thirteenth pipeline, and the cold material enters the heat exchanger through the thirteenth pipeline and the twelfth pipeline.