Fire-resistant heat-preservation coke tank
By using composite structural refractory bricks and high-temperature cemented carbide lining plates in coking tanks, combined with nano-insulating plates and refractory coatings, the problem of cracking and falling off of the lining plates during repeated temperature increase and cooling is solved, and the high temperature resistance of coking tanks is achieved , heat shock resistance and efficient dry quenching effect.
Patent Information
- Application Number
- CN202420899319.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-26
AI Technical Summary
The existing metal coke tank lining plates are prone to cracking and falling off during repeated heating and cooling, resulting in a short service life and affecting the normal production of dry coke quenching.
Using composite structure refractory bricks and high-temperature cemented carbide lining plates, combined with nano-insulating plates and refractory coatings, made by solid powder mixed liquid glue process, it has high hardness, thermal shock resistance and low thermal conductivity, and can be maintained at high temperatures. Shape and reduce heat dissipation.
It extends the service life of the coke tank, reduces external radiation from high-temperature coke, improves the thermal energy utilization rate of dry quenching, avoids cracking and falling off of the lining plate, and improves the thermal efficiency of dry quenching.
Smart Images
Figure CN222274454U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of metallurgical energy-saving and emission-reducing mechanical equipment and relates to a refractory heat-insulating coke pot. Background Art
[0002] Ordinary metal coke drums include metal channel steel frames and heat-resistant linings made of Cr16 cast iron or high-chromium cast steel. It usually takes 5 minutes for 1000℃ high-temperature coke to fall into the drum and be loaded into the dry quenching tank. During this period, the lining temperature rises from 45℃ to 1000℃. It usually takes 5 minutes for the coke drum to return to the original route and be reloaded with coke, and the lining temperature drops from 1000℃ to 45℃. Such repeated heating and cooling will cause the thermal stress of the lining to accumulate, resulting in cracking of the lining, which will be abandoned and need to be replaced frequently. The existing utility model patent with patent number CN212222864U, a dry quenching refractory heat-insulating coke tank comprises a coke tank body formed by a steel structure and a refractory heat-insulating layer arranged in the coke tank body; the coke tank body comprises a tank mouth section, a cylindrical section and a conical section arranged in sequence from top to bottom, and a gate made of heat-resistant stainless steel is fixed to the bottom of the conical section; the refractory heat-insulating layer comprises a pressure-bearing heat-insulating layer fixed on the inner wall of the tank mouth section, a wear-resistant heat-insulating layer fixed on the inner wall of the cylindrical section, and an impact-resistant heat-insulating layer fixed on the inner wall of the conical section. The insulation layer and the strong impact resistant insulation layer fixed on the inner wall of the gate; the pressure-bearing insulation layer is made of amorphous pressure-resistant and refractory insulation materials; the wear-resistant insulation layer is made of lightweight mullite refractory bricks, and the amorphous pressure-resistant and refractory insulation materials are poured between adjacent lightweight mullite refractory bricks; the strong impact resistant insulation layer is made of amorphous strong impact resistant and refractory insulation materials; the impact resistant insulation layer is made of aluminum mullite refractory bricks, and the amorphous strong impact resistant and refractory insulation materials are poured between adjacent aluminum mullite refractory bricks.
[0003] The prior art has the following technical defects:
[0004] The refractory material in the above technical solution has the characteristics of low thermal conductivity, the shell temperature of the coke drum is low, and the service life is extended. Since the high-temperature heat dissipation loss of coke is small, the economic benefits of CDQ are improved. However, the refractory material is cast and easily cracked and falls off under repeated thermal stress conditions, forming pits. These pits will hang on the coke, especially the pits formed by the falling of the refractory material in the lower cone of the coke drum, resulting in a large amount of coke hanging on the coke, affecting the normal production of CDQ. Utility Model Content
[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a fire-resistant heat-insulating coke tank.
[0006] The refractory heat-insulating coke tank described in the utility model comprises a cylindrical area, a trumpet-mouthed upper edge is arranged at the upper part of the cylindrical area, a conical cylinder area is arranged at the lower part, a valve is arranged at the bottom of the conical cylinder area, the cylindrical area comprises composite structure refractory bricks, nano insulation boards and cylindrical shells arranged in sequence from the inside to the outside, the composite structure refractory bricks are 80 mm thick, the nano insulation board is 25 mm thick, the cylindrical shell is made of SUS304 stainless steel with a thickness of 20 mm, and the number of refractory bricks in each circle of the coke tank is 30 bricks, each brick stands vertically with a height of 400 mm and a thickness of 80 mm. The conical cylinder area includes a high-temperature carbide lining and a conical cylinder shell connected to the cylindrical shell. The conical cylinder shell is fixedly connected to the high-temperature carbide lining by high-temperature bolts. Refractory coating is filled between the conical cylinder shell and the high-temperature carbide lining. The high-temperature carbide lining does not deform, slag, or expand slightly under the direct collision of high-temperature coke. It does not break after repeated heating and cooling. The refractory coating fills the gap between the high-temperature carbide lining and the conical cylinder shell. It adopts solid powder mixed with liquid glue, has no moisture, does not require high-temperature furnace process, and can be put into use after air drying. The refractory coating has low thermal conductivity and small heat energy loss. It can prevent heat dissipation and make the surface temperature of the conical cylinder shell lower than 50°C. The insulation material is ZJQ-1700 refractory coating.
[0007] A brick support plate is provided at the connection between the cylindrical shell and the conical shell, and the composite structure refractory bricks are supported by the brick support plate. The brick support plate is made of 310S heat-resistant stainless steel, with a thickness of 20 mm and a total of 2 layers.
[0008] The brick supporting plate is also provided with a reinforcing vertical plate to enhance the supporting strength of the brick supporting plate.
[0009] The composite structure refractory brick is an arc-shaped brick with curved protrusions and grooves at both ends. The overall curvature is compatible with the cylindrical shell. The outer arc of the brick is 586 mm, the inner arc is 560 mm, the thickness is 80 mm, the brick body has an arc groove, the protrusion arc radius is 25 mm, and the transition arc radius is 20 mm. Each brick bites two bricks on the left and right, and the structure is stable, ensuring that the brick body bites tightly and will not fall off when the coke tank rotates. When the composite structure refractory bricks are arranged, a gap of 0.5 to 1 mm is retained in the circumferential direction as a brick joint, and refractory mud is filled between the brick joints for bonding, which also acts as an expansion joint in a high temperature state.
[0010] The composite structure refractory brick includes a wear-resistant layer, a transition layer and a clay layer. The wear-resistant layer is a high-proportion silicon carbide layer, and the transition layer is a low-proportion silicon carbide intermediate transition layer. The high-proportion silicon carbide layer is 20 mm thick, the silicon carbide content is 35%, the hardness is high, the thermal shock resistance is good, and no cracks will occur when encountering high-temperature coke; the low-proportion silicon carbide intermediate transition layer is 40 mm thick, the silicon carbide ratio is 5%, the hardness is low, the toughness is high, the brick body has high flexural strength, and no large cracks will occur; the clay layer is 20 mm thick, the clay has low thermal conductivity, and can reduce heat loss; the high-proportion silicon carbide layer, the low-proportion silicon carbide intermediate transition layer and the clay layer, each layer is made into an independent brick blank, which is aligned and stacked, and then pressed into a whole in a mold, dried at low temperature, and then fired at high temperature in a kiln to form a whole brick.
[0011] The outer surface of the clay layer is coated with a heat-insulating coating, and the heat-insulating coating may be a ZHX500 nanometer heat-insulating coating, which can further reduce heat radiation to the outside and reduce heat loss.
[0012] The gate is made of 4Cr25Ni35WNb cast steel, and the surface of the gate is sprayed with an alumina coating by supersonic flame, with a coating thickness of 0.2 mm to improve wear resistance.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] The composite refractory material inside the cylinder area of the utility model is resistant to high temperature, thermal shock, repeated heating and cooling, has high hardness, is wear-resistant, can be used for a long time, and has a service life better than traditional linings and refractory castables. It can also greatly reduce the external radiation of high-temperature coke, reduce the surface temperature of the coke tank to 45°C, greatly reduce heat loss, and improve the thermal energy utilization rate of dry quenching. The characteristics of high-temperature cemented carbide linings are used to solve the problem of cracking, falling off, and forming pits on traditional coke tank linings, which leads to coke hanging, thereby improving the thermal efficiency of dry quenching. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.
[0016] Figure 2 This is a schematic diagram of the structure of the cylinder area in one embodiment of the utility model.
[0017] Figure 3 It is a structural schematic diagram of a composite structure refractory brick in one embodiment of the utility model.
[0018] In the figure: 1. Composite structure refractory bricks; 2. Nano insulation board; 3. Cylindrical shell; 4. Brick support plate; 5. Reinforced vertical plate; 6. Conical shell; 7. High temperature bolts; 8. Refractory coating; 9. High temperature cemented carbide lining; 10. Wear-resistant layer; 11. Clay layer; 12. Transition layer. DETAILED DESCRIPTION
[0019] Example 1
[0020] like Figure 1 to Figure 3As shown, the refractory and heat-insulating coke tank described in the utility model comprises a cylindrical area, a trumpet-mouthed upper edge is arranged at the upper part of the cylindrical area, a conical cylinder area is arranged at the lower part, a valve is arranged at the bottom of the conical cylinder area, the cylindrical area comprises a composite structure refractory brick 1, a nano insulation board 2 and a cylindrical shell 3 arranged in sequence from the inside to the outside, the composite structure refractory brick 1 is 80 mm thick, the nano insulation board 2 is 25 mm thick, the cylindrical shell 3 is made of SUS304 stainless steel with a thickness of 20 mm, and the number of refractory bricks in each circle of the coke tank is 30 bricks, each brick stands vertically with a height of 400 mm and a thickness of 80 mm.The conical cylinder area includes a high-temperature hard alloy lining plate 9 and a conical cylinder shell 6 connected to the cylindrical shell 3. The conical cylinder shell 6 is fixedly connected to the high-temperature hard alloy lining plate 9 by high-temperature bolts 7. A refractory coating material 8 is filled between the conical cylinder shell 6 and the high-temperature hard alloy lining plate 9. The high-temperature hard alloy lining plate 9 does not deform, slag, or expand slightly under the direct collision of high-temperature coke. It does not break after repeated heating and cooling. The refractory coating material 8 fills the gap between the high-temperature hard alloy lining plate 9 and the conical cylinder shell 6. It adopts solid powder mixed with liquid glue, has no moisture, does not require a high-temperature furnace process, and can be put into use after air drying. The refractory coating material 8 has a low thermal conductivity and a small heat energy loss, and can prevent heat dissipation, so that the surface temperature of the conical cylinder shell 6 is lower than 50°C. The thermal insulation material It is ZJQ-1700 refractory coating 8; a brick support plate 4 is provided at the connection between the cylindrical shell 3 and the conical shell 6, and the composite structure refractory brick 1 is supported by the brick support plate 4. The brick support plate 4 is made of 310S heat-resistant stainless steel, with a thickness of 20 mm and a total of 2 layers; a reinforcing vertical plate 5 is also provided at the brick support plate 4 to strengthen the supporting strength of the brick support plate 4; the composite structure refractory brick 1 is an arc-shaped brick with curved protrusions and grooves at both ends, and the overall curvature is adapted to the cylindrical shell 3. The outer arc of the brick body is 586 mm, the inner arc is 560 mm, the thickness is 80 mm, the brick body has an arc groove, the convex arc radius is 25 mm, and the transition arc radius is 20 mm. Each brick bites the left and right bricks, and the structure is stable to ensure The bricks are tightly interlocked and will not fall off when the coke drum rotates. When the composite refractory bricks 1 are arranged, a gap of 0.5 to 1 mm is reserved in the circumferential direction as a brick joint, and refractory mud is filled between the brick joints for bonding, and at the same time acts as an expansion joint in a high-temperature state; the composite refractory bricks 1 include a wear-resistant layer 10, a transition layer 12 and a clay layer 11, the wear-resistant layer 10 is a high-proportion silicon carbide layer, and the transition layer 12 is a low-proportion silicon carbide intermediate transition layer 12, the high-proportion silicon carbide layer is 20 mm thick, the silicon carbide content is 35%, the hardness is high, the thermal shock resistance is good, and no cracks will occur when encountering high-temperature coke; the low-proportion silicon carbide intermediate transition layer 12 is 40 mm thick, the silicon carbide ratio is 5%, the hardness is low, the toughness is high, and the brick body is resistant to bending. High strength, no large cracks; the clay layer 11 is 20 mm thick, and the clay has low thermal conductivity, which can reduce heat loss; the high-proportion silicon carbide layer, the low-proportion silicon carbide intermediate transition layer 12 and the clay layer 11, each layer is made into an independent brick blank, which is aligned and stacked, and then pressed into a whole in a mold, dried at low temperature, and then fired at high temperature in a kiln to form a whole brick; the clay layer 11 is coated with insulation coating on the outer surface, and the insulation coating can be a nano-insulation coating ZHX500 specially used for bricks, which can further reduce heat radiation to the outside and reduce heat loss; the gate is made of 4Cr25Ni35WNb cast steel, and the surface of the gate is sprayed with alumina coating by supersonic flame, with a coating thickness of 0.2 mm to improve wear resistance.
[0021] The composite refractory material inside the cylindrical area of the utility model is resistant to high temperature, thermal shock, repeated heating and cooling, has high hardness, is wear-resistant, can be used for a long time, and has a service life better than traditional linings and refractory castables. It can also greatly reduce the external radiation of high-temperature coke, reduce the surface temperature of the coke tank to 45°C, greatly reduce heat loss, and improve the thermal energy utilization rate of dry coke quenching; the characteristics of the high-temperature cemented carbide lining 9 are used to solve the problem of cracking, falling off, and forming pits on the traditional coke tank lining, which leads to coke hanging, thereby improving the thermal efficiency of dry coke quenching.
[0022] The description of the direction and relative position relationship of the structure in the present invention, such as the description of front, back, left, right, up, and down, does not constitute a limitation of the present invention, but is only for the convenience of description.
Claims
1. A refractory heat-insulating coke tank, comprising a cylindrical area, a bell-mouth upper edge is arranged at the upper part of the cylindrical area, a conical cylinder area is arranged at the lower part, and a valve is arranged at the bottom of the conical cylinder area, characterized in that: The cylindrical area comprises composite structure refractory bricks (1), nano thermal insulation panels (2) and a cylindrical shell (3) which are arranged in sequence from the inside to the outside; The conical cylinder area comprises a high-temperature hard alloy lining (9) and a conical cylinder shell (6) connected to the cylindrical shell (3); the conical cylinder shell (6) is fixedly connected to the high-temperature hard alloy lining (9) by high-temperature bolts (7); and a refractory coating (8) is filled between the conical cylinder shell (6) and the high-temperature hard alloy lining (9).
2. The refractory heat-insulating coke tank according to claim 1, characterized in that: A brick supporting plate (4) is provided at the connection between the cylindrical shell (3) and the conical shell (6).
3. The refractory heat-insulating coke tank according to claim 2, characterized in that: The brick supporting plate (4) is also provided with a reinforcing vertical plate (5).
4. The refractory heat-insulating coke tank according to claim 3, characterized in that: The composite structure refractory brick (1) is an arc-shaped brick with curved protrusions and grooves at both ends, and the whole brick has an arc that matches the cylindrical shell (3).
5. The refractory heat-insulating coke tank according to any one of claims 1 to 4, characterized in that: The composite structure refractory brick (1) comprises a wear-resistant layer (10), a transition layer (12) and a clay layer (11), wherein the wear-resistant layer (10) is a high-proportion silicon carbide layer, and the transition layer (12) is a low-proportion silicon carbide intermediate transition layer.
6. The refractory heat-insulating coke tank according to claim 5, characterized in that: The outer surface of the clay layer (11) is coated with a heat-insulating coating.