Novel gas collecting pipe structure of clean type heat recovery coke oven

Abstract

The invention provides a novel gas collecting pipe structure of a clean type heat recovery coke oven, which comprises a shell, a membrane type water cooling wall, a plastic material layer and a lining layer, the membrane type water cooling wall is arranged on the inner side of the shell, the plastic material layer is arranged on the inner wall of the membrane type water cooling wall, and the lining layer is arranged on the inner wall of the plastic material layer; a heat preservation layer is further arranged between the membrane type water cooling wall and the inner wall of the shell, and anchoring nails are arranged on the side wall of the side, away from the heat preservation layer, of the membrane type water cooling wall and used for arranging a plastic layer. And steam is introduced into the membrane type water cooling wall. The shell and the membrane type water cooling wall jointly support to form a firm whole, and the situation that a supporting mechanism in the prior art damages a mullite brick structure after being heated, then high-temperature flue gas directly washes the shell, the shell of the gas collecting pipe is deformed and carbonized, and finally production line accidents are caused by damage is effectively avoided. The shell and the membrane type water cooling wall jointly form a firm whole, and accidents can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial kiln accessories in the coking field, and in particular to a new gas collecting pipe structure for a clean heat recovery coke oven. Background Art

[0002] The clean heat recovery coke oven is an energy-saving and environmentally friendly coke oven that can fundamentally expand coking resources, achieve clean production of products, reduce the emission of waste heat and exhaust gas, and meet the environmental protection production requirements of energy conservation and emission reduction.

[0003] Clean heat recovery coke oven is different from traditional mechanical coke oven. It has the following advantages:

[0004] First, the coking process is simple, and the design and infrastructure investment costs are low.

[0005] Secondly, the coke oven gas recovery device is eliminated, which will not produce pollutants such as tar and phenol water, and will greatly improve environmental protection.

[0006] The third is negative pressure operation, which solves the problem of air leakage from the furnace door and reduces the release of waste to the lowest level.

[0007] Fourth, all volatile substances produced by coking can be burned, and the heat of the high-temperature flue gas generated can be fully utilized for power generation or heating, achieving higher thermal efficiency.

[0008] A clean heat recovery coke oven primarily consists of a carbonization chamber, combustion chamber, and gas header. The combustion chamber is located at the bottom of the carbonization chamber. High-temperature exhaust gas from the combustion chamber is transported through an ascending flue in the coke oven body to the gas header and main gas header, ultimately sending the high-temperature exhaust gas to the waste heat boiler to generate steam for power generation. Therefore, the structure of the gas header and its insulation and heat resistance have a significant impact on the efficient utilization of coke oven waste heat.

[0009] There are two different configurations of existing headers:

[0010] The gas collecting pipe adopts a full fiber lining. The interior of the gas collecting pipe is sequentially provided with a ceramic fiber blanket layer and a thermal insulation module made of ceramic fiber. The thermal insulation module and fiber blanket layer form a flat-laid and stacked composite lining structure. The thermal insulation module and fiber blanket are connected to the steel plate wall through anchors to form an integral whole.

[0011] The gas collecting pipe is lined with ceramic fiberboard and anti-carburization lightweight mullite brick. From the inside to the outside, the gas collecting pipe is made of mullite brick as refractory material and ceramic fiberboard as insulation material, which are welded to the steel plate wall through anchors.

[0012] Of the two aforementioned collecting pipe structures, the first type is likely to produce the following consequences: since the exhaust gas temperature transported by the collecting pipe is above 1000°C, or even up to 1300°C; and the exhaust gas contains harmful corrosive gases such as water vapor, the thermal insulation lining is very likely to shrink or fall off, resulting in cracks, and has poor resistance to turbulent erosion, aggravating the erosion of the insulation lining and even the steel plate by the harmful high-temperature exhaust gas; seriously affecting the service life and thermal insulation performance of the collecting pipe, reducing the temperature of the flue gas entering the waste heat power generation boiler, and preventing the efficient use of the waste heat from the coke oven.

[0013] The second type of gas collecting pipe structure is likely to cause the following consequences: the gas collecting pipe wall is repeatedly eroded by high-temperature corrosive gases, and the wall volume shrinks unevenly and the temperature gradient is repeatedly affected, which makes the pipe wall bricks very likely to produce shrinkage gaps and loosen, which not only aggravates the invasion of high-temperature exhaust gas into the pipe wall bricks, but also accelerates the cracking and loosening of the pipe wall and the peeling of bricks. Summary of the Invention

[0014] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a new gas collecting pipe structure for a clean heat recovery coke oven, so as to solve the structural defects of the gas collecting pipe in the prior art.

[0015] To achieve the above-mentioned objectives and other related objectives, the present invention provides a new gas collecting pipe structure for a clean heat recovery coke oven, comprising an outer shell, a membrane water-cooled wall, a plastic layer, and an inner lining layer, wherein the membrane water-cooled wall is arranged on the inner side of the outer shell, the plastic layer is arranged on the inner wall of the membrane water-cooled wall, and the inner lining layer is arranged on the inner wall of the plastic layer; an insulation layer is further arranged between the membrane water-cooled wall and the inner wall of the outer shell, and an anchor nail is arranged on the side wall of the membrane water-cooled wall away from the insulation layer for setting the plastic layer; steam is passed into the membrane water-cooled wall.

[0016] Preferably, the number of the outer shells is two, and the shape of the outer shells is arc-shaped, and the open ends of the two arc-shaped outer shells are spliced together to form an air collecting pipe.

[0017] Preferably, the number of the membrane-type water-cooling walls is two, and the shape of the membrane-type water-cooling walls is arc-shaped. The two arc-shaped membrane-type water-cooling walls are fixedly connected to the two arc-shaped shells.

[0018] Preferably, the number of the thermal insulation layers is two, the shape of the thermal insulation layers is arc-shaped, and the thermal insulation layers are arranged between the outer shell and the membrane water-cooled wall.

[0019] Preferably, the thermal insulation layer is made of any one of aluminum silicate fiber felt, asbestos-free calcium silicate, and nanogel.

[0020] Preferably, the membrane water-cooled wall includes a plurality of pipes and a plurality of pipe connectors, and a continuous membrane structure is formed between the plurality of pipes through the plurality of pipe connectors; a membrane water-cooled wall steam inlet header is provided at one end of the plurality of pipes, and a membrane water-cooled wall steam outlet header is provided at the other end.

[0021] Preferably, the pipe is a seamless steel pipe, and the pipe connector is a flat steel, and several flat steels are welded to connect several pipes.

[0022] Preferably, the plastic layer is made of corundum plastic; the plastic layer is installed on the anchor pins of the membrane water-cooled wall.

[0023] Preferably, the lining layer is formed by stacking mullite bricks.

[0024] Preferably, the anchor nail is a Y-shaped heat-resistant anchor nail.

[0025] As described above, the novel gas collecting pipe structure of the clean heat recovery coke oven according to the present invention has the following beneficial effects:

[0026] 1. The novel gas collector structure for clean heat recovery coke ovens disclosed herein comprises two outer shells, two insulation layers, and two membrane water-cooled walls, all of which are arc-shaped and fixedly connected. As a result, the structure can be considered a single component and prefabricated in a factory. During on-site construction, the two components can be spliced together to form a complete gas collector, effectively improving its accuracy and avoiding errors that may occur during on-site construction.

[0027] 2. The novel gas collector structure for clean heat recovery coke ovens disclosed herein comprises a housing and membrane water-cooled walls, which together form a solid, integrated unit. This effectively avoids the conventional support mechanism, which, when heated, damages the mullite brick structure. This in turn causes high-temperature flue gas to directly scour the housing, leading to deformation and carbonization of the collector housing, ultimately causing damage and production line accidents. The housing and membrane water-cooled walls of the present invention form a solid, integrated unit, effectively preventing such accidents.

[0028] 3. The new gas collecting pipe structure of the clean heat recovery coke oven involved in the present invention is provided with a membrane water-cooled wall. Steam is passed through the membrane water-cooled wall. The steam can absorb the heat of the high-temperature flue gas, preventing the heat of the high-temperature flue gas from acting on the outer shell, so that the outer shell surface temperature is controlled below 50°C. Compared with the outer shell surface temperature of about 100°C in the prior art, it can greatly reduce the heat dissipation of the outer surface of the gas collecting pipe shell, thereby avoiding a reduction in the overall coking energy consumption.

[0029] 4. The present invention relates to a new gas collecting pipe structure for a clean heat recovery coke oven. The membrane water-cooled wall is connected to a steam drum, into which saturated steam is introduced. The saturated steam can absorb the heat carried by the high-temperature flue gas, prevent the steam from condensing into a liquid phase, and reduce the weight of the heating surface of the boiler gas collecting pipe structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the new gas collecting pipe structure of the clean heat recovery coke oven after installation of the present invention;

[0031] Figure 2 This is a structural schematic diagram of the new gas collecting pipe structure of the clean heat recovery coke oven of the present invention.

[0032] Description of reference numerals:

[0033] 1. Inner lining layer; 2. Plastic layer; 3. Anchor nails; 4. Membrane water-cooled wall; 5. Insulation layer; 6. Outer shell; 7. Membrane water-cooled wall steam inlet header; 8. Membrane water-cooled wall steam outlet header. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0035] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0036] like Figure 1 、 Figure 2 As shown, the present invention provides a new gas collecting pipe structure for a clean heat recovery coke oven, comprising an outer shell 6, a membrane water-cooled wall 4, a plastic layer 2, and an inner lining layer 1. The membrane water-cooled wall 4 is arranged on the inner side of the outer shell 6, the plastic layer 2 is arranged on the inner wall of the membrane water-cooled wall 4, and the inner lining layer 1 is arranged on the inner wall of the plastic layer 2; an insulation layer 5 is further arranged between the membrane water-cooled wall 4 and the inner wall of the outer shell 6, and an anchor nail 3 is provided on the side wall of the membrane water-cooled wall 4 away from the insulation layer 5 for setting the plastic layer 2; steam is passed into the membrane water-cooled wall 4.

[0037] The novel gas collecting pipe structure for a clean, heat-recovery coke oven disclosed herein comprises a membrane water-cooled wall 4, a plastic layer 2, and an inner lining 1. Steam is introduced into the membrane water-cooled wall 4 to absorb heat from the high-temperature flue gas in the collecting pipe, keeping the pipe's surface temperature below 50°C. This significantly reduces heat dissipation from the outer surface of the collecting pipe, compared to the approximately 100°C surface temperature of conventional adiabatic structures, thereby reducing overall coking energy consumption. Furthermore, the membrane water-cooled wall 4 is positioned inside the outer shell 6, and the two together form a solid support structure, effectively preventing deformation of the collecting pipe caused by heating of the conventional support structure.

[0038] Preferably, Figure 1 、 Figure 2 As shown, there are two outer shells 6, each of which is arc-shaped. The open ends of the two arc-shaped outer shells 6 are spliced together to form a gas collecting pipe. Furthermore, there are two membrane water-cooled walls 4, each of which is arc-shaped. The two arc-shaped membrane water-cooled walls 4 are fixedly connected to the two arc-shaped outer shells 6. There are two thermal insulation layers 5, each of which is arc-shaped and disposed between the outer shells 6 and the membrane water-cooled walls 4.

[0039] In this embodiment, the arc-shaped membrane water-cooling wall 4 is fixedly connected to the inner side of the arc-shaped shell 6, and the arc-shaped insulation layer 5 is arranged between the membrane water-cooling wall 4 and the shell 6, so that the three form a complete arc-shaped component (such as Figure 2 When the open ends of two identical arc-shaped components are aligned and assembled, a circular manifold is formed (as shown). Figure 1 As shown). In this way, the arc-shaped components can be prefabricated in the factory and then assembled on site, with high precision, avoiding errors caused by on-site construction. During assembly, the open ends of the shell 6 are also filled with steel of the same material as the shell 6 and welded together.

[0040] Preferably, in this embodiment, the insulation layer 5 is made of any of aluminum silicate fiber felt, asbestos-free calcium silicate, and nanogel. The insulation layer 5 provides insulation while also reducing heat loss throughout the entire gas collecting pipe. In other embodiments, the insulation layer 5 may be made of other materials as long as they provide sufficient insulation performance.

[0041] Preferably, in this embodiment, the membrane water-cooled wall 4 includes a plurality of pipes and a plurality of pipe connectors, and a continuous membrane structure is formed between the plurality of pipes through the plurality of pipe connectors; a membrane water-cooled wall steam inlet header 7 is provided at one end of the plurality of pipes, and a membrane water-cooled wall steam outlet header 8 is provided at the other end.

[0042] Furthermore, the membrane water-wall steam inlet header 7 and the membrane water-wall steam outlet header 8 are used to integrate the ends of several pipes. Each of these headers is connected to a steam drum filled with saturated steam. The high-temperature flue gas in the gas header heats the saturated steam in the drum. The saturated steam absorbs the heat from the high-temperature flue gas, creating either natural or forced circulation.

[0043] Furthermore, in this embodiment, the pipes are made of pressure-resistant seamless steel pipes, and the pipe connectors are made of flat steel. Several flat steels are welded together to form a continuous membrane structure through the pipe connectors. The seamless steel pipes and flat steel are made of high-quality alloy steel (e.g., SA-213T12) that is resistant to high temperatures and high pressures, ensuring durability under harsh operating conditions.

[0044] Preferably, in this embodiment, the plastic layer 2 is made of corundum plastic; the plastic layer 2 is mounted on the anchor pins 3 of the membrane water-cooled wall 4. The corundum plastic is mounted on the anchor pins 3 welded on the surface of the membrane water-cooled wall 4 by on-site tampering to prevent high-temperature flue gas from eroding and damaging the membrane water-cooled wall 4 through the gaps in the inner lining layer 1.

[0045] Preferably, in this embodiment, the inner lining layer 1 is constructed from stacked mullite bricks. The mullite bricks are lightweight, carburization-resistant mullite bricks and are stacked on the plastic layer 2 using a high-temperature adhesive. This requires only one layer of mullite bricks, which reduces the number of mullite bricks required by the second solution in the prior art. Expansion joints must be reserved between the mullite bricks in the inner lining layer 1.

[0046] Preferably, in this embodiment, the anchor nail 3 is a Y-shaped heat-resistant anchor nail.

[0047] The novel gas collecting pipe structure of the clean heat recovery coke oven involved in the present invention has the following working principle:

[0048] From the inside to the outside, the first thing that comes into contact with the high-temperature flue gas in the gas collecting pipe in this application is the inner lining layer 1 composed of carburizing-resistant lightweight mullite bricks. The thickness of a layer of mullite bricks is about 114 mm, and they are built with high-temperature adhesives. At the same time, expansion joints are reserved between the mullite bricks.

[0049] The second layer is a plastic layer 2, which is made of corundum plastic and has a thickness of 70-80 mm. The plastic layer 2 is connected to the membrane water-cooling wall 4 through anchor nails 3. The density of the anchor nails 3 is about 150 mm * 150 mm.

[0050] The third layer is the membrane water wall 4, constructed from seamless steel pipes with diameters of 42mm or 52mm and wall thicknesses of 7mm or 8mm, bent into semi-arcs and welded together with flat steel bars. The ends of these seamless steel pipes are connected to the membrane water wall steam inlet and outlet headers 7 and 8, respectively. Both headers are constructed from 219mm diameter pipes. Their lengths are determined according to the design drawings.

[0051] The fourth layer is the thermal insulation layer 5, and the thickness of the thermal insulation layer 5 is 100 mm or 150 mm.

[0052] The outermost layer is the outer shell 6, which is made of a 6mm thick steel plate bent into a semi-arc shape. The outer shell 6 plays a protective and load-bearing role.

[0053] The total thickness of the gas collecting pipe in this application from the high-temperature flue gas side to the outermost air side is 350 mm or 400 mm.

[0054] The present invention relates to a new type of gas collecting pipe structure for a clean heat recovery coke oven, in which the outer shell 6 and the membrane water-cooled wall 4 are fixedly connected to form a supporting whole. Compared with the supporting structure in the prior art, the gas collecting pipe will not be deformed after being heated, nor will the mullite brick structure be damaged due to deformation of the gas collecting pipe. Furthermore, there will be no problem of high-temperature flue gas directly flushing the outer shell 6, causing deformation, carbonization, or even damage to the outer shell 6. In addition, steam is introduced into the membrane water-cooled wall 4, and the steam can absorb the heat of the high-temperature flue gas, protecting the outer shell 6 from direct erosion by high temperature. At the same time, since the temperature of the outer shell 6 is reduced, the heat dissipation of the outer surface of the gas collecting pipe can also be reduced, thereby reducing the overall energy consumption of coking. The present application can improve the thermal stability of the gas collecting pipe structure and reduce the heat dissipation loss on the outer surface of the gas collecting pipe.

[0055] Therefore, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A new gas collecting pipe structure for a clean heat recovery coke oven, characterized by: The invention comprises an outer shell (6), a membrane water-cooled wall (4), a plastic layer (2), and an inner lining layer (1); the membrane water-cooled wall (4) is arranged on the inner side of the outer shell (6); the plastic layer (2) is arranged on the inner wall of the membrane water-cooled wall (4); and the inner lining layer (1) is arranged on the inner wall of the plastic layer (2); a thermal insulation layer (5) is further arranged between the membrane water-cooled wall (4) and the inner wall of the outer shell (6); an anchoring nail (3) is arranged on the side wall of the membrane water-cooled wall (4) away from the thermal insulation layer (5) for arranging the plastic layer (2); and steam is passed into the membrane water-cooled wall (4).

2. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 1 is characterized in that: There are two outer shells (6), each of which is arc-shaped. The open ends of the two arc-shaped outer shells (6) are spliced together to form a gas collecting pipe.

3. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 2 is characterized in that: The number of the membrane-type water-cooling walls (4) is two, and the shape of the membrane-type water-cooling walls (4) is arc-shaped. The two arc-shaped membrane-type water-cooling walls (4) are fixedly connected to the two arc-shaped shells (6).

4. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 3 is characterized in that: The number of the thermal insulation layers (5) is two, the shape of the thermal insulation layers (5) is arc-shaped, and the thermal insulation layers (5) are arranged between the outer shell (6) and the membrane water-cooled wall (4).

5. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 1 is characterized in that: The thermal insulation layer (5) is made of any one of aluminum silicate fiber felt, asbestos-free calcium silicate, and nano gel.

6. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 1 is characterized in that: The membrane water-cooled wall (4) comprises a plurality of pipes and a plurality of pipe connectors, wherein the plurality of pipes form a continuous membrane structure through the plurality of pipe connectors; a membrane water-cooled wall steam inlet header (7) is provided at one end of the plurality of pipes, and a membrane water-cooled wall steam outlet header (8) is provided at the other end.

7. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 6 is characterized in that: The pipe is a seamless steel pipe, and the pipe connector is a flat steel. Several flat steels are welded together to connect several pipes.

8. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 1 is characterized in that: The plastic layer (2) is made of corundum plastic; the plastic layer (2) is installed on the anchoring nails (3) of the membrane water-cooling wall (4).

9. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 1 is characterized in that: The inner lining layer (1) is formed by stacking mullite bricks.

10. The novel gas collecting pipe structure for a clean heat recovery coke oven according to claim 1 is characterized in that: The anchoring nail (3) is a Y-shaped heat-resistant anchoring nail.

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