Dispersed load bearing and elastic connecting structure of steel vertical pyrolysis furnace

Abstract

The utility model relates to low rank coal upgrading equipment technical field, concretely is a kind of steel vertical pyrolysis furnace's dispersed load bearing and elastic connecting structure, steel furnace body is segmented to be independent module, outer periphery is equipped with bearing frame, each module is fixed in the frame corresponding floor height by support structure, realizes dispersed load bearing;Expansion gap is reserved between module, adopts expansion joint welding connection;Heat preservation layer is arranged as heat insulation layer in the furnace body shell inside;External heating type furnace type is heated gas across the disconnected between modules by external pipeline, expansion joint is additionally installed on pipeline, the structure dispersed furnace body weight to solve the problem of insufficient bearing capacity in lower part, dispersed thermal expansion displacement simplifies furnace body and frame connection, expansion joint solves sealing problem, heat insulation layer improves furnace body strength and reduces expansion amount, guarantees heating system stability, helps low rank coal pyrolysis efficient implementation.

Description

Technical Field

[0001] This utility model relates to the technical field of low-rank coal upgrading equipment, specifically a distributed load-bearing and elastic connection structure for a steel vertical pyrolysis furnace. Background Technology

[0002] More than half of my country's coal reserves are low-rank coal. Due to its high volatile content, low-rank coal is not suitable for direct combustion, but it is a high-quality resource for coal-to-oil and coal-to-gas production via pyrolysis. Therefore, the country has been vigorously promoting the upgrading and utilization technology of low-rank coal to promote comprehensive resource utilization and environmental protection. Pyrolysis and semi-coking are currently the main methods for upgrading and utilizing low-rank coal. The most widely used equipment in the industry is the vertical furnace. The production process of the vertical furnace involves loading raw coal into the furnace from the top. During the downward movement of the coal, it undergoes counter-current heat transfer with the upward-moving heat transfer medium gas, causing the raw coal to undergo a pyrolysis reaction. After releasing pyrolysis gas, it is converted into coke. The pyrolysis gas is then cooled and separated into coal gas and coal tar, thus realizing the upgrading and transformation of low-quality coal from coal to char, oil, and gas. Traditionally, vertical furnaces for low-rank coal pyrolysis are constructed using refractory materials. However, due to the problems associated with refractory materials, vertical pyrolysis furnaces made of metallic steel have emerged in the industry. Metallic steel has the characteristics of high mechanical strength and stable crystal structure, and it also has excellent thermal conductivity that refractory materials cannot match. Therefore, compared with refractory furnace bodies, steel furnace bodies have the advantages of lightweight and thin structure, saving heating energy consumption, and unrestricted start-up and shutdown.

[0003] Traditional vertical pyrolysis furnaces for low-rank coal, constructed with refractory materials, offer advantages such as good thermal stability and a low coefficient of thermal expansion. However, they suffer from poor mechanical strength, heavy furnace bodies due to changes in crystal structure between hot and cold states, high thermal resistance, and furnace body cracking during start-up and shutdown. While vertical pyrolysis furnaces made of steel overcome some of the defects of refractory furnace bodies, steel's rapid strength decay after heating makes it impossible for steel furnace bodies to achieve the same structural stability as traditional refractory furnace bodies. Beyond a certain scale, steel furnace bodies cannot independently bear weight and require external load-bearing structures for stability. Furthermore, due to the high coefficient of thermal expansion of steel, the furnace body undergoes significant dimensional expansion and contraction in the height direction under varying hot and cold conditions during operation and shutdown. This complexity complicates the connection between the furnace body and the external load-bearing structure, posing considerable challenges to engineering implementation. Therefore, there is an urgent need to develop a distributed load-bearing and elastic connection structure for steel vertical pyrolysis furnaces to overcome the shortcomings in current practical applications. Utility Model Content

[0004] The purpose of this invention is to provide a distributed load-bearing and elastic connection structure for a steel vertical pyrolysis furnace, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A distributed load-bearing and elastic connection structure for a steel vertical pyrolysis furnace includes: Multiple steel furnace body modules manufactured in sections, a load-bearing frame located on the outer periphery of the furnace body, and a support structure for fixing each furnace body module to the corresponding layer height position of the load-bearing frame. A thermal expansion gap is reserved between adjacent furnace body modules, and they are connected by welding through connecting expansion joints; The furnace module has an internal heat insulation layer.

[0006] As a further embodiment of this utility model: the furnace body module includes at least one of a coal bunker module, a feeding module, a drying module, a pyrolysis module, a quenching module, a discharge module, and a coke bin module.

[0007] As a further embodiment of this utility model: the supporting structure independently fixes each of the furnace body modules at different heights of the load-bearing frame, so that each module only bears its own weight.

[0008] As a further embodiment of this utility model: the connecting expansion joint is welded to the outer wall of two adjacent furnace body modules.

[0009] As a further embodiment of this utility model, it also includes a socket limiting strip disposed between adjacent furnace body modules for connection and positioning between modules.

[0010] As a further aspect of this utility model, the size of the thermal expansion and contraction gap is determined based on the maximum thermal expansion displacement of the furnace body during operation.

[0011] As a further embodiment of this utility model: the heat insulation layer is a heat insulation layer disposed inside the outer shell of the furnace module, used to reduce the temperature of the outer wall of the furnace module.

[0012] As a further embodiment of this utility model, it also includes a heating gas connecting pipe for external heating, wherein the heating gas connecting pipe is connected between adjacent furnace modules to connect the interrupted heating gas.

[0013] As a further embodiment of this utility model: the heating gas connecting pipe is provided with an expansion joint to accommodate the expansion and contraction of the pipeline caused by temperature changes.

[0014] As a further embodiment of this utility model: the load-bearing frame is a steel structure frame, and each furnace module is fixed to the frame layer at its corresponding height through the support structure.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. By using a load-bearing frame to distribute the weight of the vertical furnace, the weight of each module is distributed and borne by the frame. This ensures that each module of the furnace body does not bear the weight of the upper module in addition to its own weight, thus solving the problem of insufficient load-bearing capacity of the furnace body, especially the lower part.

[0016] 2. Expansion and contraction gaps are reserved between each module of the furnace body. Each module can freely expand and contract up and down within the reserved gaps, based on the mounting surface of the load-bearing frame. The linear expansion and contraction displacement of the furnace body caused by temperature is distributed within the reserved gaps between each module to compensate for the problem, thus simplifying the connection between the furnace body and the load-bearing frame.

[0017] 3. Expansion joints are used to weld the modules together to achieve elastic connection, which effectively solves the sealing problem under the thermal expansion displacement state of the modules.

[0018] 4. By placing the furnace body's insulation layer inside the furnace body shell, it becomes a heat insulation layer, which can reduce the temperature of the outer wall of the furnace body module. This not only helps to improve the strength of the furnace body module, but also reduces the amount of dimensional expansion and contraction of the furnace body module caused by temperature changes.

[0019] 5. For furnaces with external heating, the heating gas that is interrupted between modules is connected by external pipelines, which solves the problem of heating gas interruption between modules after the furnace body is divided into multiple modules. This ensures that the heating gas is supplied normally to meet the pyrolysis requirements of the furnace body. In addition, the expansion energy-saving device installed on the crossover pipeline adapts to the expansion and contraction of the pipeline due to temperature changes, avoids damage to the pipeline due to thermal expansion and contraction, and ensures the stable operation of the heating system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace of this utility model.

[0021] Figure 2 This is an enlarged structural schematic diagram of a partial cross-section of the expansion joint in this utility model.

[0022] In the diagram: 1-Vertical furnace module A, 2-Connecting expansion joint component one, 3-Heating gas connection pipe one, 4-Vertical furnace module B, 5-Connecting expansion joint component two, 6-Heating gas connection pipe two, 7-Vertical furnace module C, 8-Bearing frame, 9-Partial cross-section of connecting expansion joint, 10-Internal insulation layer, 11-Upper module, 12-Connecting expansion joint, 13-Socket limiting strip, 14-Lower module. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0025] Please see Figure 1 and Figure 2 The present invention provides a distributed load-bearing and elastic connection structure for a steel vertical pyrolysis furnace, which specifically includes the following: 1. Steel furnace body module (including functional modules such as coal bunker module, feeding module, drying module, pyrolysis module, quenching module, discharge module, coke bin module, etc., with the same appearance, structure and connection method for each functional module, such as vertical furnace module A1, vertical furnace module B4, vertical furnace module C7), load-bearing frame 8, and the supporting structure of each module itself. The steel furnace body is manufactured in sections along its height, with each section becoming a relatively independent modular structure. A load-bearing frame 8 is constructed around the furnace body. Each furnace body module is connected and fixed to the corresponding floor height position of the load-bearing frame 8 through its own support structure (e.g., vertical furnace module A1 is fixed to floor height a of the load-bearing frame 8, vertical furnace module B4 is fixed to floor height b of the load-bearing frame 8, and vertical furnace module C7 is fixed to floor height c of the load-bearing frame 8). Multiple modular structures are stacked sequentially to assemble a complete vertical furnace body. First, based on the height of the modules and the maximum thermal expansion and contraction displacement that may occur after the furnace body is in operation, determine the installation position of each module of the load-bearing frame 8; then, install and fix the furnace body modules (such as vertical furnace module A1, vertical furnace module B4, and vertical furnace module C7) at the corresponding floor height positions of the load-bearing frame 8 to complete the assembly of the complete vertical furnace body. By using the load-bearing frame 8 to distribute the weight of the vertical furnace, the weight of each module is distributed and borne by the frame, so that each module of the furnace body does not bear the weight of the upper module in addition to its own weight, thus solving the problem of insufficient load-bearing capacity of the furnace body, especially the lower part.

[0026] 2. Each module of the furnace body (such as vertical furnace module A1, vertical furnace module B4, vertical furnace module C7), the thermal expansion gap D reserved between modules, the connecting expansion joints between modules (such as connecting expansion joint part 1 2, connecting expansion joint part 2 5, connecting expansion joint 12), the socket limiting strip 13, the upper module 11, the lower module 14, and the partial cross-section of the connecting expansion joint 9; A pre-reserved thermal expansion gap D is provided between each module of the furnace body; each module is connected by welding expansion joints (e.g., connecting expansion joint 1 2 is provided between vertical furnace module A1 and vertical furnace module B4, and connecting expansion joint 2 5 is provided between vertical furnace module B4 and vertical furnace module C7), and the connecting expansion joints are welded to the outer walls of the upper and lower modules; socket limiting strips 13 are provided between modules for connection and positioning between modules; partial cross-section 9 of the connecting expansion joint shows the partial structure of the connecting expansion joint between modules, and the upper module 11 and the lower module 14 are connected by connecting expansion joint 12; After the furnace body modules are installed in place, the expansion joints connecting the modules are welded to the outer walls of the upper and lower modules. When the furnace is in a hot state during operation or in a cold state during shutdown, each module can freely expand and contract to both ends within the reserved thermal expansion and contraction gap D between the modules, based on the mounting surface of the load-bearing frame 8. The elasticity of the expansion joints is used to adapt to the expansion and contraction displacement of the modules, achieving a seal between modules that does not exceed the displacement of the reserved gap size D. The partial cross-section 9 of the expansion joint can intuitively show the connection status of the expansion joint between the modules. The upper module 11 and the lower module 14 achieve elastic connection and sealing through the expansion joint 12. The linear expansion and contraction displacement of the furnace body caused by temperature is distributed within the reserved thermal expansion and contraction gap D between each module to compensate for the problem, simplifying the connection between the furnace body and the load-bearing frame 8; the elastic connection of the connecting expansion joints between modules (such as connecting expansion joint 12, connecting expansion joint 25, and connecting expansion joint 12) solves the sealing problem under the thermal expansion displacement state of the modules.

[0027] 3. Furnace body outer shell and internal heat insulation layer 10 (i.e., the furnace body's heat insulation layer); The insulation layer of the furnace body is set inside the outer shell of the furnace body, so that the insulation layer becomes the internal heat insulation layer 10. When the furnace body is running, the internal heat insulation layer 10 blocks the heat inside the furnace body from being transferred to the outer wall of the furnace body module, thereby reducing the temperature of the outer wall of the furnace body module. Reducing the temperature of the outer wall of the furnace body module is beneficial to improving the strength of the furnace body module, and at the same time, it reduces the amount of dimensional expansion and contraction of the furnace body module caused by thermal changes.

[0028] 4. Furnace body modules (such as vertical furnace module A1, vertical furnace module B4, vertical furnace module C7) for furnaces with external heating methods, external pipelines (i.e., heating gas connection pipe 1 3, heating gas connection pipe 2 6, which are cross-connection pipelines), and expansion joints installed on the cross-connection pipelines. For furnaces using external heating, the furnace body is manufactured in multiple modules, and the heating gas is interrupted between each module. The interrupted heating gas between modules is connected by external pipelines (i.e., heating gas connection pipe 1 3 and heating gas connection pipe 2 6). Expansion joints are installed on the connecting pipelines. When the furnace body is in operation with external heating, the heating gas flows through the cross-pipes (heating gas connection pipe 1 3, heating gas connection pipe 2 6) equipped with expansion joints between the divided furnace body modules (vertical furnace module A1, vertical furnace module B4, vertical furnace module C7), realizing the connection of heating gas throughout the entire furnace body and providing continuous heating for the furnace body. This invention solves the problem of heating gas interruption between modules in external heating furnaces where the furnace body is divided into multiple modules, ensuring a normal supply of heating gas to meet the furnace's pyrolysis requirements. The expansion joints on the cross-pipelines can adapt to the expansion and contraction of the pipelines due to temperature changes, preventing damage to the pipelines due to thermal expansion and contraction and ensuring the stable operation of the heating system.

[0029] It should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "sliding," "rotating," "fixed," and "equipped" should be interpreted broadly. For example, they can refer to welded connections, bolted connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A distributed load-bearing and elastic connection structure for a steel vertical pyrolysis furnace, characterized in that, include: Multiple steel furnace body modules manufactured in sections, a load-bearing frame located on the outer periphery of the furnace body, and a support structure for fixing each furnace body module to the corresponding layer height position of the load-bearing frame. A thermal expansion gap is reserved between adjacent furnace body modules, and they are connected by welding through connecting expansion joints; The furnace module has an internal heat insulation layer.

2. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, The furnace module includes at least one of the following: coal bunker module, feeding module, drying module, pyrolysis module, quenching module, discharge module, and coke bin module.

3. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, The supporting structure independently fixes each furnace module to a different height position of the load-bearing frame, so that each module only bears its own weight.

4. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, The expansion joint is welded to the outer wall of two adjacent furnace modules.

5. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, It also includes a socket limiting strip disposed between adjacent furnace body modules for connection and positioning between modules.

6. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, The size of the thermal expansion gap is determined based on the maximum thermal expansion displacement of the furnace body during operation.

7. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, The heat insulation layer is a heat insulation layer set inside the outer shell of the furnace module, used to reduce the temperature of the outer wall of the furnace module.

8. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, It also includes a heating gas connection pipe for external heating, which is connected between adjacent furnace modules to connect the interrupted heating gas.

9. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 8, characterized in that, The heating gas connection pipe is equipped with an expansion joint to accommodate the expansion and contraction of the pipeline caused by temperature changes.

10. The distributed load-bearing and elastic connection structure of the steel vertical pyrolysis furnace according to claim 1, characterized in that, The load-bearing frame is a steel structure frame, and each furnace module is fixed to the frame layer at its corresponding height through the supporting structure.

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