Energy-saving waste magnesia carbon brick treatment device

Abstract

An energy-saving waste magnesia carbon brick treatment device comprises storage bins, sprayers, a first barrel, a second barrel, a ventilation channel, discharging equipment, a fuel spray gun, a cooling air pipeline and a ventilation pipeline, the lower portion of the first barrel is communicated with the lower portion of the second barrel through the ventilation channel, and the storage bins are arranged at the tops of the two barrels. The bottom of each barrel is provided with a discharging device, the cooling air pipelines feed cooling air into the barrels from the discharging devices at the bottoms of the barrels, the ventilation pipelines are connected with the upper ends of the barrels, the sprayers are arranged on the upper portions of the barrels, and the fuel spray guns are arranged in the middles of the barrels. The device disclosed by the utility model has the functions of hydrating, removing impurities and drying the waste magnesia carbon bricks in an integrated manner, so that the process integration level is greatly improved, and the treatment time is shortened; the occupied area is reduced; due to the double-cylinder structure and the alternate working mode of the device, heat of flue gas can be recycled in a material heat storage mode, and energy consumption is reduced to the maximum extent; and environmental pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment of refractory materials, in particular to an energy-saving waste magnesium carbon brick processing device. Background Art

[0002] In the steel smelting industry, magnesium carbon bricks are widely used due to their excellent performance. However, with the improvement of environmental protection awareness and the gradual reduction of magnesium ore resources, the treatment and recycling of waste magnesium carbon bricks have become particularly important. As a commonly used additive in magnesium carbon bricks, metal aluminum powder will react with other components during use to produce aluminum carbide (Al4C3) and a small amount of aluminum nitride (AlN). These substances will produce hydration reactions when they come into contact with water, thereby releasing gases such as methane and ammonia, causing expansion cracks and even powdering of the recycled refractory materials. Therefore, waste magnesium carbon bricks must be hydrated during the recycling process to remove these impurities and be fully dried. However, the traditional recycling method relies on hydrating and naturally drying the broken bricks at room temperature. This practice is not only greatly affected by the seasons and has a long processing cycle, but also because the temperature of natural drying is not high enough, it is impossible to completely remove impurities. What's more serious is that most of the harmful gases such as methane and ammonia released in this process are directly discharged into the environment, which not only pollutes the environment and wastes resources, but also poses a threat to the health of operators.

[0003] In order to overcome these problems, some companies have begun to develop and adopt specialized functional processing devices in recent years. Early equipment such as drying drums and rotary drying kilns, although they can effectively dry materials, lack hydration and impurity removal functions. Although the tunnel-type heat treatment device that appeared later integrates hydration, impurity removal and drying, and successfully solves the core technical problems, this type of device usually occupies a large area and is not suitable for companies with limited space. Moreover, the flue gas temperature emitted by the device exceeds 100°C, and a waste heat recovery system is required to reduce overall energy consumption. Utility Model Content

[0004] The utility model provides an energy-saving waste magnesia carbon brick processing device, which has the functions of integrated hydration, impurity removal and drying of waste magnesia carbon bricks, greatly improving the process integration and shortening the processing time; the device adopts a vertical structure, which can effectively reduce the floor space; and the double-cylinder structure and alternating working mode of the device can recover the heat of the flue gas by means of material heat storage, thereby reducing energy consumption to the greatest extent; the harmful gases generated during the heat treatment process can be centrally processed by collecting the flue gas, thereby avoiding environmental pollution.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An energy-saving waste magnesium carbon brick processing device includes a storage bin, a sprayer, a first cylinder, a second cylinder, a ventilation channel, a discharge device, a fuel spray gun, a cooling air duct, and a ventilation duct. The first cylinder is connected to the lower part of the second cylinder through a ventilation channel. The tops of the two cylinders are provided with storage bins, and the bottoms of the two cylinders are provided with discharge devices. The cooling air duct delivers cooling air into the cylinder from the discharge device at the bottom of the cylinder. The ventilation duct is connected to the upper end of the cylinder. The sprayer is arranged on the upper part of the cylinder, and the fuel spray gun is arranged in the middle of the cylinder.

[0007] The cross-sections of the first cylinder and the second cylinder are polygonal, circular, semicircular or elliptical, and the walls of the cylinders are provided with outer shells and heat insulation materials in sequence from the outside to the inside.

[0008] A feeding gate is arranged between the storage bin and the cylinder.

[0009] A plurality of support columns are arranged inside the lower part of the first cylinder and the second cylinder, and are evenly distributed circumferentially along the central axis of the cylinder. The bottom of each support column is connected to the cylinder foundation, and the top of the support column is connected to the wall of the cylinder through an annular heat-resistant steel plate.

[0010] The unloading equipment includes a discharger, a cooling hood, a collecting hopper, and a discharge gate; the discharger is connected to the bottom of the two cylinders, the collecting hopper is below the discharger, a cooling hood is connected between the dischargers, the outlet of the cooling air duct is arranged below the cooling hood, and a discharge gate is provided at the bottom of the collecting hopper.

[0011] The fuel spray guns are arranged in 1 to 4 layers along the axial direction of the cylinder, and each layer is provided with multiple fuel spray guns, which are evenly distributed circumferentially along the central axis of the cylinder; one end of the fuel spray gun extends into the interior of the cylinder, and the other end is connected to the fuel pipeline and the combustion-supporting air pipeline; a spray gun protection cover is provided above the fuel spray gun.

[0012] The ventilation duct is connected to one end of the three-way reversing valve, the other end of the three-way reversing valve is connected to the combustion-supporting air duct, and the third end of the three-way reversing valve is connected to the smoke exhaust duct.

[0013] The upper parts of the first cylinder and the second cylinder are both provided with material dividing devices.

[0014] Temperature and pressure instrument measurement points are arranged at multiple locations inside the first cylinder and the second cylinder.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1) The device of the utility model divides different functional areas by temperature gradient, meets the processing requirements of waste magnesia carbon bricks at different stages, realizes the hydration, impurity removal and drying functions of waste magnesia carbon bricks, and has high process integration.

[0017] 2) The device of the utility model greatly reduces the processing time of waste magnesia carbon bricks, shortening the original 7 to 10 days required for natural drying to less than 3 days; the device adopts a vertical structure, which can effectively reduce the floor space compared to natural drying or horizontal equipment.

[0018] 3) The device of the utility model periodically switches the states of the two cylinders so that the moving direction of the internal hot air and the moving direction of the waste magnesium carbon bricks are in a state of countercurrent and parallel flow, so that the heat of the flue gas is absorbed by the material to the greatest extent, achieving a heat storage effect and reducing energy consumption to the greatest extent.

[0019] 4) When the device of the utility model is working, the material does not move significantly, effectively avoiding dust and noise pollution.

[0020] 5) The smoke generated by the device of the utility model can be collected and processed centrally, thus avoiding environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the device described in the utility model.

[0022] In the figure: 1. Storage bin 2. Sprinkler 3a. First cylinder 3b. Second cylinder 4. Unloading equipment 5. Fuel spray gun 6. Ventilation channel 7. Wall 8. Feeding gate 9. Ventilation duct 10. Support column 11. Heat-resistant steel plate 12. Discharger 13. Cooling air hood 14. Collecting hopper 15. Cooling air duct 16. Fuel pipeline 17. Combustion-supporting air duct 18. Spray gun protection cover 19. Three-way reversing valve 20. Smoke exhaust pipe 21. Water supply pipe 22. Material distribution device 23. Unloading gate 24. Material surface. DETAILED DESCRIPTION

[0023] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0024] like Figure 1 As shown, an energy-saving waste magnesium carbon brick processing device includes a storage bin 1, a sprayer 2, a first cylinder 3a, a second cylinder 3b, a ventilation channel 4, a discharge device 5, a fuel spray gun 6, a cooling air duct 15, and a ventilation duct 9. The first cylinder 3a is connected to the lower part of the second cylinder 3b through the ventilation channel 4, and the top of the two cylinders is provided with a storage bin 1, and the bottom of the two cylinders is provided with a discharge device 5. The cooling air duct 15 delivers cooling air into the cylinder from the discharge device 5 at the bottom of the cylinder. The ventilation duct 9 is connected to the upper end of the cylinder. The cooling air flows upward against the material flow and passes into the ventilation duct 9 arranged at the upper end of the cylinder. The sprayer 2 is arranged at the upper part of the cylinder, and the fuel spray gun 6 is arranged at the middle part of the cylinder.

[0025] The cross-sections of the first cylinder 3a and the second cylinder 3b are polygonal, circular, semicircular or elliptical, and the walls 7 of the cylinders are provided with outer shells and heat insulation materials in sequence from the outside to the inside.

[0026] A feeding gate 8 is arranged between the storage bin 1 and the cylinder.

[0027] A plurality of support columns 10 are provided inside the lower part of the first cylinder 3a and the second cylinder 3b, which are evenly distributed circumferentially along the central axis of the cylinder. The bottom of each support column 10 is connected to the cylinder foundation, and the top of the support column 10 is connected to the wall 7 of the cylinder through an annular heat-resistant steel plate 11.

[0028] The unloading equipment 5 includes a discharging machine 12, a cooling hood 13, a collecting hopper 14, and a discharging gate 23; the discharging machine 12 is connected to the bottom of the two cylinders, the collecting hopper 14 is below the discharging machine 12, the cooling hood 13 is connected between the discharging machines 12, the outlet of the cooling air duct 15 is arranged below the cooling hood 13, and the discharging gate 23 is arranged at the bottom of the collecting hopper 14. The side wall of the cooling hood 13 is provided with ventilation holes.

[0029] The fuel spray guns 6 are arranged in 1 to 4 layers along the axial direction of the cylinder, and each layer is provided with multiple fuel spray guns 6, which are evenly distributed circumferentially along the central axis of the cylinder; one end of the fuel spray gun 6 extends into the interior of the cylinder, and the other end is connected to the fuel pipeline 16 and the combustion-supporting air pipeline 17; a spray gun protection cover 18 is provided above the fuel spray gun 6.

[0030] The ventilation duct 9 is provided with one or more ventilation interfaces on the upper part of the cylinder body. The ventilation duct 9 is connected to one end of a three-way reversing valve 19, the other end of the three-way reversing valve 19 is connected to the combustion-supporting air duct 17, and the third end of the three-way reversing valve 19 is connected to the smoke exhaust duct 20.

[0031] The sprayer 2 is provided with one or more connection ports on the upper part of the cylinder body, and the sprayer 2 is connected to the water supply pipe 21 .

[0032] The upper parts of the first cylinder and the second cylinder are both provided with material dividing devices.

[0033] The support column is made of heat-resistant steel or other heat-resistant materials.

[0034] Temperature and pressure instrument measurement points are provided at multiple locations inside the first cylinder 3a and the second cylinder 3b.

[0035] An energy-saving waste magnesium carbon brick processing device comprises a storage bin 1, a sprayer 2, a first cylinder 3a, a second cylinder 3b, a ventilation channel 4, a discharge device 5 and a fuel spray gun 6; the first cylinder 3a and the second cylinder 3b are connected by the ventilation channel 4, each cylinder is divided into an upper part, a middle part and a lower part from top to bottom according to the position, and the wall 7 of each part of the cylinder is composed of a shell and a heat insulation material arranged in sequence from the outside to the inside; the top of the upper part of the cylinder is connected to the storage bin through a feeding gate 8; the spray gun 6 is connected to the storage bin by ... The shower 2 is arranged at the upper part of the cylinder; the upper part of the cylinder is connected to the ventilation duct 9; the fuel spray gun 6 is arranged in the middle part of the cylinder; the lower part of the cylinder contains a plurality of support columns 10, which are evenly distributed circumferentially along the central axis of the cylinder, and the bottom of each support column 10 is connected to the cylinder foundation, and the top of the support column 10 is connected to the bottom of the wall in the middle of the cylinder through an annular heat-resistant steel plate 11; the unloading equipment is arranged at the bottom of the lower part of the cylinder, including a discharger 12, a cooling air hood 13 and a collecting hopper 14; a cooling air duct 15 is arranged inside the unloading equipment.

[0036] The waste magnesia carbon brick processing process using the energy-saving waste magnesia carbon brick processing device includes the following steps:

[0037] 1) Add the waste magnesia carbon brick raw materials with a set particle size range (10-50mm) and wet mixed with water into the storage bin 1, and send them into the first cylinder 3a and the second cylinder 3b through the dividing device 22. When the material surface reaches the set height in the upper part of the cylinder, close the feeding gate 8.

[0038] 2) First, the fuel spray gun 6 of the first cylinder 3a works, and the fuel spray gun 6 of the second cylinder 3b is closed. At the same time, the three-way reversing valve 19 of the first cylinder 3a is cut to the combustion-supporting air duct 17, and the three-way reversing valve 19 of the second cylinder 3b is cut to the smoke exhaust duct 20. During this period, the unloading gates 23 at the bottom of the two cylinders are kept closed, and the cooling air duct 15 is opened, the discharger 12 works continuously or intermittently, and the material in the cylinder moves slowly downward; by controlling the flow at different positions of the cooling air duct 15, the smoke exhaust duct 20, the fuel duct 16 and the combustion-supporting air duct 17, and adjusting the speed and frequency of the discharger 12, the temperature at different positions in the cylinder and the residence time of the material at different positions are controlled. In this state, the material in the middle of the first cylinder 3a is in the drying process, and the flue gas temperature at this position is controlled at 150-400°C; the material in the upper part of the first cylinder 3a, the upper part of the second cylinder 3b, and the middle part of the second cylinder 3b is in the hydration and impurity removal process, and the flue gas temperature at this position is controlled below 150°C; the material in the lower part of the first cylinder 3a and the lower part of the second cylinder 3b is in the cooling process; during this period, the sprayer 2 of the first cylinder 3a performs intermittent or continuous action according to the setting, spraying water into the first cylinder 3a;

[0039] 3) After the set cycle working time is reached, the fuel spray guns 6 are all closed, the fuel, combustion-supporting air and cooling air are stopped from being supplied, and the unloading gates 23 at the bottom of the two cylinders are opened to complete the unloading action. When the unloading is completed, the unloading gate 23 is closed; at the same time, the feeding gate 8 at the top of the first cylinder 3a is also opened to feed the material in the storage bin 1 into the first cylinder 3a. When the material surface reaches the set height in the upper part of the cylinder, the feeding gate 8 is closed; after all are completed, the two cylinders are ready to switch to the next cycle;

[0040] 4) In the next cycle, the corresponding actions of the two cylinder devices and the functions realized by the two cylinders are swapped, that is, in this cycle, the first cylinder 3a device executes the action of the second cylinder 3b device in step 2), and the second cylinder 3b device executes the action of the first cylinder 3a device in step 2), until the same set working time is reached; then step 3) is executed again, but the corresponding actions of the two cylinder devices and the functions realized by the two cylinders are swapped; this alternating operation is repeated until the processing of all waste magnesium carbon brick particles is completed.

[0041] The final flue gas temperature is lower than 100°C, and all flue gases are discharged through the exhaust pipe 20 and collected in the flue gas treatment device for unified treatment; the waste magnesia carbon brick particles enter from the top and are discharged from the bottom, and the cumulative treatment time of the hydration and impurity removal process is controlled to be 12 to 48 hours, and the cumulative treatment time of the drying process is 6 to 24 hours.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An energy-saving waste magnesia carbon brick processing device, characterized in that: It includes a storage bin, a sprayer, a first cylinder, a second cylinder, a ventilation channel, a discharge device, a fuel spray gun, a cooling air duct, and a ventilation duct. The lower parts of the first cylinder and the second cylinder are connected through the ventilation channel. The tops of the two cylinders are provided with storage bins, and the bottoms of the two cylinders are provided with discharge devices. The cooling air duct delivers cooling air into the cylinder from the discharge device at the bottom of the cylinder. The ventilation duct is connected to the upper end of the cylinder. The sprayer is arranged on the upper part of the cylinder, and the fuel spray gun is arranged in the middle part of the cylinder.

2. The energy-saving waste magnesia-carbon brick processing device according to claim 1 is characterized in that: The cross-sections of the first cylinder and the second cylinder are polygonal, circular, semicircular or elliptical, and the walls of the cylinders are provided with outer shells and heat insulation materials in sequence from the outside to the inside.

3. The energy-saving waste magnesium carbon brick processing device according to claim 1 is characterized in that: A feeding gate is arranged between the storage bin and the cylinder.

4. The energy-saving waste magnesia-carbon brick processing device according to claim 1 is characterized in that: A plurality of support columns are arranged inside the lower part of the first cylinder and the second cylinder, and are evenly distributed circumferentially along the central axis of the cylinder. The bottom of each support column is connected to the cylinder foundation, and the top of the support column is connected to the wall of the cylinder through an annular heat-resistant steel plate.

5. The energy-saving waste magnesia carbon brick processing device according to claim 1 is characterized in that: The unloading equipment includes a discharger, a cooling hood, a collecting hopper, and a discharge gate; the discharger is connected to the bottom of the two cylinders, the collecting hopper is below the discharger, a cooling hood is connected between the dischargers, the outlet of the cooling air duct is arranged below the cooling hood, and a discharge gate is provided at the bottom of the collecting hopper.

6. The energy-saving waste magnesia-carbon brick processing device according to claim 1 is characterized in that: The fuel spray guns are arranged in 1 to 4 layers along the axial direction of the cylinder, and each layer is provided with multiple fuel spray guns, which are evenly distributed circumferentially along the central axis of the cylinder; one end of the fuel spray gun extends into the interior of the cylinder, and the other end is connected to the fuel pipeline and the combustion-supporting air pipeline; a spray gun protection cover is provided above the fuel spray gun.

7. An energy-saving waste magnesia-carbon brick processing device according to claim 1 or 6, characterized in that: The ventilation duct is connected to one end of the three-way reversing valve, the other end of the three-way reversing valve is connected to the combustion-supporting air duct, and the third end of the three-way reversing valve is connected to the smoke exhaust duct.

8. The energy-saving waste magnesia-carbon brick processing device according to claim 1 is characterized in that: The upper parts of the first cylinder and the second cylinder are both provided with material dividing devices.

9. The energy-saving waste magnesia-carbon brick processing device according to claim 1 is characterized in that: Temperature and pressure instrument measurement points are arranged at multiple locations inside the first cylinder and the second cylinder.

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