Heat storage open type roasting furnace

Abstract

The invention discloses a heat storage open type roasting furnace, and relates to the technical field of open type roasting furnaces, the heat storage open type roasting furnace comprises a furnace shell, a plurality of flame path boxes are arranged in the furnace shell, a gap is reserved between every two adjacent flame path boxes to form a material box, and a combustion chamber is arranged in each flame path box; vent ports are formed in the positions, located above the two sides of the combustion chamber, of the side wall of the flame path box, heat accumulators are arranged in the two vent ports, and fire holes are formed in the upper portion of the combustion chamber. Through the heat accumulator structures at the two ends of the flame path, smoke heat is reused, the smoke exhaust temperature is reduced, and therefore the heat taken away by smoke is reduced, and the energy consumption is reduced. And therefore, the energy-saving effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of open roasting furnaces, in particular to a heat storage open roasting furnace used for the production of non-metallic materials such as anode carbon blocks. Background Art

[0002] The open roasting furnace uses high-temperature flue gas and the roasted products to heat the roasted products at high temperature. The high-temperature flue gas transfers heat to the roasted products in the material box through the fire channel wall. For example, the invention patent with the announcement number CN114562885A discloses a novel flue for aluminum electrolysis prebaked anode baking furnace, including a flue box, which is assembled on the outer side wall of the flue wall of the baking furnace, and is assembled from a left side wall, a bottom plate, a right side wall and four plates, and a cover plate located on the top of the four plates is also provided in the burner hole, and a smoke inlet groove is provided on the flue box at the top of the left side wall; However, the smoke generated by combustion in the existing open roasting furnace fire channel is discharged through the smoke exhaust rack and directly enters the smoke purification system. The heat lost with the smoke is rarely recovered for waste heat utilization. The amount of smoke generated by roasting is large, resulting in a large amount of heat loss caused by the smoke. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a heat storage open roasting furnace, which reuses the heat of the flue gas through the heat storage structure at both ends of the fire channel, reduces the exhaust temperature of the flue gas, thereby reducing the heat carried away by the flue gas, and thus achieves energy saving.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a heat storage open roasting furnace, including a furnace shell, a plurality of fire channel boxes are arranged in the furnace shell, a gap is left between two adjacent fire channel boxes to form a material box, each of the fire channel boxes is provided with a combustion chamber, and the side walls of the fire channel box are provided with air vents on both sides above the combustion chamber, heat storage bodies are provided in the two air vents, and a fire hole is provided above the combustion chamber.

[0005] Preferably, there are two fire holes, and the two fire holes are respectively close to the two air vents.

[0006] Preferably, an inspection hole is opened above the vent, and a plurality of blocking blocks are stacked in the inspection hole.

[0007] Preferably, the blocking blocks are composed of two layers, an upper layer and a lower layer, with a gap between the two layers.

[0008] Preferably, the heat storage body is formed by stacking heat storage bricks with holes.

[0009] Preferably, end walls and side walls are provided in the furnace shell, and a bottom plate is provided at the bottom of the furnace shell.

[0010] Preferably, the end wall comprises a high-alumina insulating refractory brick layer, a mullite insulating refractory brick layer, and a refractory fiberboard layer, the side wall comprises a mullite insulating refractory brick layer, and a refractory fiberboard layer, and the bottom plate comprises a refractory clay brick layer and a mullite insulating refractory brick layer.

[0011] Preferably, a leveling layer is provided at the bottom of the furnace shell.

[0012] The present invention provides a heat storage open type roasting furnace, which has the following beneficial effects: 1. The heat storage body is located at the air intake and smoke exhaust holes at both ends of the combustion chamber. It can absorb and store most of the heat carried away by the smoke generated by combustion in the combustion chamber, reducing the temperature of the waste heat smoke. When the air intake and smoke exhaust directions are changed, the air flows through the heat storage body and is continuously heated. After entering the combustion chamber, the overall temperature of the fire box rises quickly, which improves the utilization rate of the heat from fuel combustion; 2. Inspection holes are provided above the heat storage bodies at both ends of the fire channel box. The upper and lower blocks of the inspection holes are laid in a movable manner without mud, which is convenient for regular inspection or replacement of the heat storage bodies. At the same time, the heat storage bodies are composed of multiple heat storage body units, which is convenient for inspection and replacement. 3. By periodically switching the air intake and exhaust directions, the roasting furnace can be heated evenly as a whole, avoiding the large temperature difference at both ends of the firebox, and the overall expansion is uniform, resulting in less deformation of the furnace body; 4. The heat storage body is filled in the air intake and smoke exhaust holes at both ends of the fire channel box, which can play a certain beneficial effect on the heat preservation of the combustion chamber of the fire channel box; 5. After the heat storage body absorbs the heat in the flue gas, the temperature of the flue gas discharged from the fire channel box will be significantly reduced, which is beneficial to the subsequent waste heat flue gas treatment and the selection of physical and chemical indicators of the refractory materials for the flue lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A top view of the present invention; Figure 2 for Figure 1 Sectional view of AA in the middle; Figure 3 for Figure 1 Cross-sectional view of the middle BB; Figure 4 for Figure 1 Cross-sectional view of CC.

[0014] In the figure: 1. furnace shell; 2. fire channel box; 3. material box; 4. combustion chamber; 5. air vent; 6. heat storage body; 7. fire hole; 8. inspection hole; 9. blocking block; 12. end wall; 13. side wall; 14. bottom plate; a1. high-alumina insulating refractory brick layer; a2. mullite insulating refractory brick layer; a3. refractory fiberboard layer; a4. refractory clay brick layer; a5. leveling layer. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] See also Figure 1-4 The present invention provides a technical solution: a heat storage open roasting furnace, including a furnace shell 1, a plurality of fire channel boxes 2 are arranged in the furnace shell 1, a gap is left between two adjacent fire channel boxes 2 to form a material box 3, each fire channel box 2 is provided with a combustion chamber 4, and the side walls of the fire channel box 2 are located above the two sides of the combustion chamber 4 and are provided with air vents 5, and the two air vents 5 are provided with heat storage bodies 6, and the combustion chamber 4 is provided with fire holes 7 above. The burner of the combustion control system is connected to the inside of the combustion chamber 4 through the fire holes 7 to provide the required fuel for its combustion. When in use, one of the two air vents 5 is a smoke outlet and the other is an air inlet. The fuel burns in the combustion chamber 4 to generate a large amount of heat, so as to heat the material in the material box 3. The smoke generated after the fuel is burned is discharged at the exhaust port. When the heat storage body 6 is discharged, the heat storage body 6 can be heated. After heating for a certain period of time, the air intake and smoke exhaust directions are changed, so that the cold air enters the combustion chamber 4 through the high-temperature heat storage body 6. The cold air can be preheated to improve the combustion efficiency. At the same time, the heat storage body 6 on the other side can absorb the heat in the flue gas, thereby realizing the continuous absorption and utilization of the heat taken away by the flue gas in the combustion chamber 4. By periodically changing the air intake and smoke exhaust directions, the roasting furnace can be heated evenly as a whole, avoiding the situation where the temperature difference at both ends of the combustion chamber is large. The deformation of the furnace body caused by the overall expansion is small. The heat storage body 6 can have a certain sealing effect on the combustion chamber 4, so that the heat is more concentrated on the materials in the roasting material box 3, and at the same time, it has a certain beneficial effect on the insulation in the combustion chamber 4.

[0017] As an embodiment of the present invention, there are two fire holes 7, and the two fire holes 7 are respectively close to the two air vents 5. By setting two fire holes 7, the fire holes 7 close to the air inlet can spray fuel according to the flow direction of the gas, ensuring that the fuel can be fully burned in the combustion chamber 4.

[0018] As an embodiment of the present invention, an inspection hole 8 is opened above the vent 5, and a plurality of sealing blocks 9 are stacked in the inspection hole 8. The heat storage body 6 switches between cold and hot for a long time, and needs to be regularly repaired and replaced through the inspection hole 8. The sealing blocks 9 in the inspection hole 8 are stacked in a non-mudgy manner so that they can be easily removed, thereby facilitating the replacement and inspection of the heat storage body 6.

[0019] As an embodiment of the present invention, the blocking blocks 9 are composed of two layers, an upper layer and an lower layer, with a gap between the two layers, so as to improve the thermal insulation performance and facilitate the removal of the blocking blocks 9.

[0020] As an embodiment of the present invention, the heat storage body 6 is formed by stacking perforated heat storage bricks. The number of perforated heat storage bricks is 70, and the size of each perforated heat storage brick is 100mmx100mmx114mm.

[0021] As an embodiment of the present invention, an end wall 12 and a side wall 13 are provided in the furnace shell 1 , and a bottom plate 14 is provided at the bottom of the furnace shell 1 .

[0022] As an embodiment of the present invention, the end wall 12 includes a high-alumina insulating refractory brick layer a1, a mullite insulating refractory brick layer a2, and a refractory fiber board layer a3, the side wall 13 includes a mullite insulating refractory brick layer a2, a refractory fiber board layer a3, and the bottom plate 14 includes a refractory clay brick layer a4, and a mullite insulating refractory brick layer a2.

[0023] As an embodiment of the present invention, a leveling layer a5 is provided at the bottom of the furnace shell 1. The thickness of the leveling layer a5 is 20 mm, which can ensure that the furnace body is perpendicular to the ground.

[0024] The working principle and use process of the present invention are as follows: when in use, the material is loaded into the material box 3 and filled with insulation material accordingly. The material in the material box 3 is roasted and heated through the adjacent fire channel boxes 2 on both sides to meet the quality requirements. The fire hole 7 on the top of the combustion chamber 4 is connected to the burner of the combustion control system. The fuel sprayed into the combustion chamber 4 through the fire hole 7 is burned, and the high-temperature flue gas generated by the combustion flows through the heat storage body 6 at the end of the fire channel, and part of the heat is absorbed and stored by it; when the stored heat reaches saturation, the air intake and exhaust directions of the fire channel are periodically converted, so that part of the heat carried away by the flue gas is stored in the heat storage body 6 and reused for preheating the air entering the combustion chamber 4; when the heat storage body 6 reaches its use cycle, the movable blocking blocks 9 in the inspection hole 8 can be removed, and then the heat storage body 6 can be taken out in blocks for replacement, and the replacement is quick and convenient.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat storage open roasting furnace, comprising a furnace shell (1), characterized in that: A plurality of fire channel boxes (2) are arranged in the furnace shell (1), a gap is left between two adjacent fire channel boxes (2) to form a material box (3), each of the fire channel boxes (2) is provided with a combustion chamber (4), and the side walls of the fire channel box (2) are provided with air vents (5) located above both sides of the combustion chamber (4), and heat storage bodies (6) are provided in the two air vents (5), and a fire hole (7) is provided above the combustion chamber (4).

2. A heat storage open type roasting furnace according to claim 1, characterized in that: There are two fire holes (7), and the two fire holes (7) are respectively close to the two vents (5).

3. The heat storage open type roasting furnace according to claim 1, characterized in that: An inspection hole (8) is provided above the vent (5), and a plurality of blocking blocks (9) are stacked in the inspection hole (8).

4. A heat storage open type roasting furnace according to claim 3, characterized in that: The blocking building blocks (9) are composed of two layers, upper and lower layers, with a gap between the two layers.

5. The heat storage open type roasting furnace according to claim 1, characterized in that: The heat storage body (6) is made of heat storage bricks with holes.

6. The heat storage open type roasting furnace according to claim 1, characterized in that: An end wall (12) and a side wall (13) are provided inside the furnace shell (1), and a bottom plate (14) is provided at the bottom of the furnace shell (1).

7. The heat storage open type roasting furnace according to claim 6, characterized in that: The end wall (12) comprises a high-alumina thermal insulation refractory brick layer (a1), a mullite thermal insulation refractory brick layer (a2), and a refractory fiber board layer (a3); the side wall (13) comprises a mullite thermal insulation refractory brick layer (a2), and a refractory fiber board layer (a3); and the bottom plate (14) comprises a refractory clay brick layer (a4) and a mullite thermal insulation refractory brick layer (a2).

8. The heat storage open type roasting furnace according to claim 1, characterized in that: A leveling layer (a5) is provided at the bottom of the furnace shell (1).

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