Carbon fixation curing kiln for non-burned building blocks

Abstract

The present application relates to the technical field of block maintenance, and particularly relates to a carbon fixation maintenance kiln for baking-free blocks, which comprises: two oppositely arranged kiln side ventilation walls, and a gas distribution cavity is formed in each kiln side ventilation wall; a heating ventilation device, which comprises an input main pipeline, a backflow main pipeline, a ventilator and a heater, the input main pipeline is connected with one of the kiln side ventilation walls, and the backflow main pipeline is connected with the other kiln side ventilation wall; a supporting structure of a supporting plate, which is arranged in multiple layers in a spaced manner to form multiple maintenance layers in the height direction; and ventilation holes are arranged in the kiln side ventilation walls and connected with the inside of the kiln body, and the ventilation holes are distributed in multiple layers in the height direction so that each maintenance layer space is equipped with the ventilation holes. During carbon fixation and maintenance, the heating ventilation device is used to realize the circulation and ventilation of the medium gas flow, break the conventional static reaction mode of the medium gas flow, effectively optimize the distribution of the medium gas flow between the upper and lower layers, and reduce the carbonization difference between the upper and lower layers.

Description

Technical Field

[0001] This invention relates to the field of block curing technology, specifically to a non-fired block carbon fixation curing kiln. Background Technology

[0002] In automated production lines for non-fired blocks such as autoclaved fly ash bricks and concrete bricks, CO2 curing is a key process for achieving carbonization and solidification of non-fired bricks and improving their strength. Freshly formed wet brick blanks need to be sent into a curing chamber to undergo a carbonization reaction under specific temperature, humidity, pressure and CO2 concentration conditions. This allows the active components in the brick blanks to react with CO2 to generate calcium carbonate, thereby improving the strength and durability of the bricks.

[0003] Current concrete carbon fixation curing devices generally adopt a reactor structure. For example, a reactor-type reaction device for carbonization testing of building materials is disclosed in Chinese patent document (CN116808978A). The airtight reaction tank serves as a closed space to contain the blocks and form a preset carbon dioxide concentration, temperature, air pressure and humidity environment. However, the space of the reactor is limited, making it difficult to carry out batch curing and thus remaining in the experimental stage. At the same time, carbon dioxide and humid air are macroscopically static and do not flow in the reactor. When there are many blocks, they occupy a large amount of space inside the reactor, and the volume of carbon dioxide and humid air is obviously insufficient.

[0004] In addition, there are cubic kiln-type curing devices, such as a concrete curing carbon sequestration device disclosed in Chinese patent document (CN116572368A). The concrete components are fed into the kiln in a multi-layer structure, and then heated carbon dioxide is introduced into the kiln. The humidity is adjusted by atomizing and spraying. This type also fails to guide the carbon dioxide and humid air introduced into the kiln. The single-point air intake leads to significant differences in the flow distribution of the reaction medium between the upper and lower layers, which in turn leads to significant differences in the degree of carbonization between the upper and lower layers of blocks. At the same time, there is also a problem of static and non-flowing on a macroscopic scale. Summary of the Invention

[0005] The purpose of this invention is to provide a non-fired block carbonization curing kiln that promotes the circulation of the medium airflow and guides the medium airflow to optimize its distribution between the upper and lower layers, thereby reducing the difference in the degree of carbonization of the blocks between the upper and lower layers.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The non-fired block carbon sequestration and curing kiln includes:

[0008] The kiln body includes two kiln side ventilation walls arranged opposite each other, and each kiln side ventilation wall forms a gas distribution chamber.

[0009] The heating and ventilation device includes an input main pipeline, a return main pipeline, and a first branch and a second branch connecting the input main pipeline and the return main pipeline. The second branch is provided with a fan and a heater, and the first branch is connected to the air inlet of the fan. The input main pipeline is connected to the kiln side ventilation wall on one side, and the return main pipeline is connected to the kiln side ventilation wall on the other side.

[0010] A pallet support structure is used to support both sides of the pallet. It is set inside the kiln body and has multiple layers arranged at intervals to form multiple curing layers in the height direction.

[0011] The ventilation wall on the side of the kiln facing the inside of the kiln has ventilation holes that communicate with the inside of the kiln. The ventilation holes are distributed in multiple layers in the height direction so that each curing layer space is equipped with a ventilation hole.

[0012] Preferably, the kiln body further includes a kiln side movable door, a kiln body frame, and a kiln top platform and a kiln side sealing wall fixedly installed on the kiln body frame. The kiln side ventilation wall is installed on opposite sides of the kiln body frame and is arranged along the length of the kiln body. The kiln side movable door and the kiln side sealing wall are installed on opposite sides of the kiln body frame and are arranged along the width of the kiln body. The kiln top platform is installed at the top of the kiln body frame.

[0013] Preferably, the kiln frame includes a base frame, side support frames, and a first top frame. The base frame is arranged at equal intervals along the front-to-back direction of the kiln body. The side support frames are located on the left and right sides of the base frame and are fixed to the base frame respectively. The first top frame is fixed to the upper part of the side support frames. The kiln top platform is installed on the first top frame. The kiln side ventilation wall and the kiln side sealing wall are both installed on the side support frames. The pallet support structure is installed on the side support frames and extends along the length of the kiln body respectively.

[0014] Preferably, the kiln frame further includes a central support frame, which is located between the side supports and fixed to the base frame. The central support frame and the side supports are directly opposite each other in the width direction of the kiln body. The first top frame is also installed on the upper part of the central support frame. The left and right sides of the central support frame are provided with tray support structures. The central support frame divides the kiln body into interconnected curing kiln areas. Each curing kiln area is equipped with multiple layers of tray support structures, and the same layer of tray support structures in the same curing kiln area is at the same horizontal height.

[0015] Preferably, the kiln side ventilation walls are composed of multiple ventilation wall units arranged along the length of the kiln body. Each ventilation wall unit includes an outer chamber wall and an inner chamber wall. The inner chamber wall and the outer chamber wall, together with the side support frames, form gas distribution chambers between two adjacent side support frames. Input branch pipes are respectively connected to the gas distribution chambers of the kiln side ventilation walls on the input main pipeline, and the input branch pipes lead into the corresponding gas distribution chambers. Return branch pipes are respectively connected to the gas distribution chambers of the kiln side ventilation walls on the return main pipeline, and the return branch pipes lead into the corresponding gas distribution chambers. The ventilation holes are provided on the inner chamber wall.

[0016] Preferably, both the inner and outer warehouse walls are made of multiple warehouse steel plates spliced ​​together by fasteners, and sealing strips are provided at the splicing points of the warehouse steel plates. The ventilation holes are provided on the warehouse steel plates of the inner warehouse wall.

[0017] Preferably, the silo body steel plate is composed of a square main plate and side folding plates integrally bent into shape on the four sides of the square main plate and facing the same direction. Each of the four side folding plates has a mounting hole. The side folding plates are spliced ​​with the adjacent silo body steel plates and side uprights by fasteners.

[0018] Preferably, the curing kiln also includes a concealed drainage device, which is located below the ground inside the kiln body to drain water from the ground inside the kiln body.

[0019] Preferably, the ventilation holes are located above each layer of the pallet support structure, or the pallet support structure and the ventilation holes are at the same horizontal level and there is a gap between the pallet support structure and the kiln side ventilation wall, and the lower end face of the pallet support structure has a strip-shaped opening that communicates with the gap.

[0020] Preferably, the heating and ventilation device further includes a CO2 input pipeline, a humid air input pipeline, a waste gas discharge pipe, a safety pressure relief pipe, and an exhaust pipe. The input end of the humid air input pipeline is connected to a humid air source, and the output end is connected to the air inlet of the ventilator through a first flow regulating unit. The input end of the CO2 input pipeline is connected to a high-pressure CO2 gas source, and the output end extends into the kiln body and is provided with a first on / off unit and a first pressure regulating unit at the output end. The CO2 input pipeline and the humid air input pipeline are respectively connected by a T-junction to form a CO2 input branch. The CO2 input branch is provided with a second on / off unit, a second flow regulating unit, and a second pressure regulating unit.

[0021] One end of the exhaust gas discharge pipe is inserted into the kiln body and the other end is outside the kiln. One end of the safety pressure relief pipe is inserted into the kiln body and the other end is connected to the exhaust gas discharge pipe through a three-way pipe. The exhaust gas discharge pipe is equipped with a third electric switch valve and a second ventilator. The safety pressure relief pipe is equipped with a safety valve.

[0022] One end of the exhaust pipe is inserted into the kiln body and the other end is outside the kiln. The exhaust pipe is equipped with a third on / off unit.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The carbon fixation curing kiln of this invention features a support structure on the kiln body and a side ventilation wall with an internal gas distribution chamber. The support structure has multiple layers spaced vertically, and the side ventilation wall has ventilation holes corresponding to each curing layer, connecting the kiln body interior and the gas distribution chamber. A heating and ventilation device is also included. The main input and return pipelines of the heating and ventilation device are connected to one side of the side ventilation wall. Thus, during carbon fixation curing, a medium airflow with the required temperature, humidity, pressure, and carbon dioxide concentration for carbon fixation reaction is supplied to one side of the side ventilation wall via the heating and ventilation device. The medium enters the kiln and reacts with the blocks. Then, with the help of the suction force of the ventilation wall on the opposite side of the kiln, the medium airflow of the same curing layer is diffused and distributed within the layer. The medium airflow is then output from the ventilation wall on the opposite side of the kiln and flows back to the heating and ventilation device, thereby realizing circulation and ventilation. This breaks the conventional mindset of static reaction of medium airflow. At the same time, the medium airflow is guided into the corresponding curing layer from the gas distribution chamber and the ventilation holes corresponding to different curing layers. This can effectively optimize its distribution between and within the upper and lower layers, reduce the difference in carbonization degree between the upper and lower layers of blocks, and is suitable for large-scale, multi-layered simultaneous carbon fixation curing of blocks. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the carbon fixation and curing kiln structure of the present invention.

[0026] Figure 2 This is a partial schematic diagram of the front part of the carbon fixation and curing kiln after omitting the decorative steel plate, the kiln side movable door, and the kiln top platform in this invention.

[0027] Figure 3 for Figure 2 The enlarged view of part A shown in the image.

[0028] Figure 4 for Figure 2 The enlarged view of part B shown in the image.

[0029] Figure 5 for Figure 2 The enlarged view of part C shown in the figure.

[0030] Figure 6 This is another example of the relationship between the pallet support structure and the ventilation holes of the present invention.

[0031] Figure 7 This is a schematic diagram showing the relationship between the kiln body frame and the foundation of the present invention.

[0032] Figure 8 for Figure 7 The enlarged view of part D shown in the figure.

[0033] Figure 9 This is a schematic diagram of the concealed drainage device of the present invention.

[0034] Figure 10 This is a schematic diagram showing the relationship between the drainage main inspection port and the foundation of the present invention.

[0035] Figure 11 This is a schematic diagram of the heating and ventilation device of the present invention.

[0036] Figure 12 for Figure 11 The enlarged view of part E shown in the figure.

[0037] Figure 13 for Figure 11 The enlarged view of part F shown in the figure.

[0038] Figure 14 for Figure 11 The enlarged view of part G shown in the figure.

[0039] Figure 15 This is a schematic diagram of the exhaust pipe structure of the present invention.

[0040] Figure 16 This is a schematic diagram of the circulating flow of the medium airflow in this invention.

[0041] Markings in the diagram: 100, kiln body; 200, heating and ventilation device; 300, trolley travel rail; 400, concealed drainage device; 500, pallet support structure; 51, L-shaped steel plate; 52, U-shaped steel plate; 520, second clamp.

[0042] 11. Kiln side movable door; 12. Kiln top platform; 130. Silo body steel plate; 131. Inner silo wall; 132. Outer silo wall; 133. Ventilation hole; 134. Decorative steel plate; 140. Slot; 141. Side support frame; 142. Middle support frame; 143. First top frame; 144. Second top frame; 145. Base frame; 21. CO2 input pipeline; 22. Humid air input pipeline; 23. Main input pipeline; 24. Return main pipeline; 25. CO2 input branch pipeline; 26. Second branch pipeline 27. First branch road; 28. Exhaust gas emission pipe; 29. ​​Exhaust pipe; 31. Ventilation fan; 32. Heater; 33. Second ventilation fan; 34. Third electric switch valve; 35. Safety valve; 36. First electric switch valve; 37. First manual switch valve; 38. Second manual switch valve; 39. Third manual switch valve; 310. Pneumatic switch valve; 311. Pressure reducing valve; 312. Proportional valve; 41. Main drainage pipe; 42. Branch drainage pipe; 43. Water inlet pipe; 44. Inspection port. Detailed Implementation

[0043] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0044] like Figures 1-2 As shown, this embodiment provides a kiln for carbon fixation curing of non-fired blocks, including a kiln body 100, a heating and ventilation device 200, a concealed drainage device 400, and a cart track 300. The bottom of the kiln body 100 is embedded in the foundation to ensure its stability. Inside the kiln body 100, multiple layers of pallet support structures 500 are arranged at intervals from bottom to top to place the pallet-supported blocks into the kiln for carbon fixation curing. The kiln side ventilation walls are located on opposite sides of the multiple pallet support structures 500. During the carbon fixation curing process, the heating and ventilation device 200... The gas flow, which has the conditions for carbon fixation reaction, is delivered to the ventilation wall of the kiln on one side. The gas flow enters the kiln and reacts with the blocks. Then, with the help of the suction force of the ventilation wall on the opposite side of the kiln, the gas flow of the same curing layer is diffused and distributed within the layer. The gas flow is then output from the ventilation wall on the opposite side of the kiln and flows back to the heating and ventilation device 200, thereby realizing circulation and ventilation. Fresh CO2 is introduced in a timely manner during the process to maintain the CO2 level. The condensate generated during the curing process is discharged from the concealed drainage device 400.

[0045] Regarding kiln body 100:

[0046] The kiln body 100 includes a kiln frame, a kiln side movable door 11, and a kiln top platform 12, kiln side ventilation wall, and kiln side sealing wall fixedly installed on the kiln frame, which together form a curing space. The kiln side movable door 11 and the kiln side sealing wall are located on the front and rear sides of the kiln body 100 and extend along the width direction of the kiln body 100, respectively. The trolley travels through the kiln side movable door 11 and along the trolley travel track 300. After being placed, the trolley exits and the kiln side movable door 11 is locked, at which point the kiln body 100 is in a closed state. The kiln side movable door 11 is a common door type and will not be described in detail here.

[0047] The kiln frame is made of 55Q steel plate with hot-dip galvanizing treatment, capable of withstanding pressure changes of ±2000Pa. The kiln frame includes a base frame 145, side supports 141, intermediate supports 142, a first top frame 143, and a second top frame 144. These components form a rectangular frame, with the kiln body 100's front-to-back direction being its length and its left-to-right direction being its width. The base frame 145, first top frame 143, and second top frame 144 are made of channel steel with an opening width of 5cm-10cm and are galvanized. The side supports 141 and intermediate supports 142 are made of U-shaped steel with an opening width of 15cm-30cm and are galvanized.

[0048] The base frame 145 is arranged at equal intervals along the front-to-back direction of the kiln body 100 and is embedded in the foundation. Side supports 141 are located on the left and right sides of the base frame 145 and are welded and fixed to the base frame 145, with their bottoms also embedded in the foundation. The middle support 142 is located between the side supports 141 and is also welded and fixed to the base frame 145, with its bottom embedded in the foundation. The middle support 142 and the side supports 141 are directly opposite each other in the width direction of the kiln body 100, with the openings of the U-shaped steel facing the rear of the kiln body 100. The first top frame 143 and the second top frame 144 are welded and fixed to the upper parts of the side supports 141 and the middle support 142, respectively, with the first top frame 143 on top and the second top frame 144 on the bottom. Figure 3 As shown. The first top frame 143 is used to install and fix the kiln top platform 12. The kiln top platform 12 is made of self-supporting steel plate with hot-dip galvanized surface treatment. People can walk on it, and the maximum load is 1.5KN / m. 2 The second top frame 144 is used to support some of the pipes of the fixed heating and ventilation device 200, namely the return main pipe 24 and the input main pipe 23, which will be described later.

[0049] It should be noted that in this embodiment, the intermediate support frame 142 is arranged in a row, on the same straight line and parallel to the two side support frames 141, thus dividing the kiln into two interconnected curing kiln zones. The width of each curing kiln zone matches the width of the pallet, and each is equipped with a multi-layer pallet support structure 500. In other examples, depending on the width of the curing kiln and the width of the pallet, two or three intermediate support frames 142 can be arranged at intervals in the width direction, thus changing the number of curing kiln zones accordingly. The intermediate support frames 142 are interconnected on both sides without affecting the flow of the medium airflow in different curing kiln zones. In addition, if all the pipes of the heating and ventilation device 200 are located on the kiln top platform 12, the second top frame 144 can be omitted.

[0050] Two kiln-side ventilation walls are provided, one on the left side of the kiln body 100 and the other on the right side of the kiln body 100. The two kiln-side ventilation walls are arranged opposite each other. Each kiln-side ventilation wall is composed of multiple ventilation wall units arranged along the length of the kiln body 100. Each ventilation wall unit is installed on the side support 141. The ventilation wall unit includes an outer chamber wall 132 and an inner chamber wall 131. The inner chamber wall 131 is located closer to the inside of the kiln, while the outer chamber wall 132 is located closer to the outside of the kiln. The inner chamber wall 131 and the outer chamber wall 132, together with the side support 141, form a gas distribution chamber between two adjacent U-shaped steel sections. Each ventilation wall unit forms a gas distribution chamber, and the gas distribution chambers of different ventilation wall units are independent of each other.

[0051] Both the inner and outer warehouse walls 131 and 132 are assembled from multiple warehouse steel plates 130 using fasteners (bolts and nuts). Figure 4As shown, the silo steel plate 130 is composed of a square main plate and side plates that are integrally bent and oriented in the same direction on all four sides of the square main plate. The lateral width of the square main plate matches the spacing between two adjacent side uprights 141. Mounting holes are provided on all four side plates. The web of the U-shaped steel of the upright is provided with assembly holes corresponding to the mounting holes of the silo steel plate 130. The longitudinal sides of the silo steel plate 130 are fixed to the adjacent silo steel plates 130 above and below by fasteners passing through the corresponding mounting holes. The lateral sides of the silo steel plate 130 are fixed to the adjacent side uprights 141 by fasteners passing through the corresponding mounting holes and assembly holes. Sealing strips are provided at the joints between silo steel plates 130 and between silo steel plates 130 and U-shaped steel to achieve an airtightness level 4 sealing effect according to EN1751. The only difference between the steel plate 130 of the inner wall 131 and the steel plate 130 of the outer wall 132 is that the steel plate 130 of the inner wall 131 has ventilation holes 133. The ventilation holes 133 connect the gas distribution chamber with the interior of the kiln body 100. In this way, the medium airflow sent from the heating and ventilation device 200 will be blown into the kiln from the ventilation holes 133 on one side of the kiln side ventilation wall, and then enter the gas distribution chamber from the ventilation holes 133 on the opposite side of the kiln side ventilation wall and then flow back to the heating and ventilation device 200.

[0052] The inner chamber wall 131 and outer chamber wall 132 are constructed by splicing steel plates 130 together with fasteners, enabling modular assembly on-site. This eliminates the need for large welding equipment, facilitating transportation and installation, and adapting to the needs of different production lines. The length and width of the kiln body 100 can be flexibly adjusted. The bottom of both the inner and outer chamber walls 130 are embedded in the foundation to prevent leakage from below the kiln side ventilation walls. Furthermore, a cover plate is sealed between the top of the inner and outer chamber walls 130 and the top of the outer chamber walls 132, with a sealing strip sandwiched between the cover plate and the steel plates 130 to prevent leakage from above the kiln side ventilation walls.

[0053] Similarly, the kiln side sealing wall also uses multiple galvanized steel plates, which are locked together using the same modular splicing and sealing method between the rear side of the side support 141 and the rear side of the middle support 142 to achieve a leak-proof seal. The overall airtightness of the kiln reaches EN1751 airtightness level 4.

[0054] Because both the intermediate support frame 142 and the side support frames 141 in this embodiment are made of U-shaped steel and face backward in the same direction, the flanges of the U-shaped steel can serve as the mounting surface for the pallet support structure 500. The pallet support structure 500 is located inside the kiln and has multiple layers spaced vertically to form multiple curing layers in the height direction. Both the pallet support structure 500 and the silo steel plate 130 are made of galvanized steel, with a single surface zinc layer of not less than 450g / m².2 It can adapt to acidic environments with pH ≤ 3.5. The steel plate is Q235 carbon structural steel, 3mm thick, with a tensile strength of not less than 235MPa. The carbon fixation reaction conditions are: temperature 60℃-65℃, humidity 80%-100%, and pH ≤ 3.5.

[0055] The pallet support structures 500 of the same layer in the same curing kiln area are all arranged at the same horizontal height and extend along the front and rear direction of the kiln body 100. The left and right sides of the pallet with blocks are supported and maintained in position by the pallet support structures 500. The pallet support structures 500 protrude 3cm-5cm from the side uprights 141 and the middle uprights 142. Sufficient spacing is left between the pallet support structures 500 of the same layer to facilitate the entry and exit of the forklift of the trolley. Sufficient height is also left between adjacent pallet support structures 500 to match the layer height design and lifting requirements of the trolley forklift. Preferably, the pallet support structure has 12 layers, which can carry out carbon fixation curing of 12 layers of blocks at one time. The layer height is, for example, 400 mm. The ventilation holes 133 on the inner wall 131 are distributed in multiple layers in the height direction so that each curing layer space is equipped with a corresponding ventilation hole 133. Preferably, at least two ventilation holes 133 in each layer space are arranged at the same horizontal height along the front and rear direction of the kiln body 100.

[0056] In a preferred embodiment, the ventilation holes 133 are located above each layer of the pallet support structure 500. The pallet support structure 500 is specifically a support strip, fixed by welding or fasteners, etc. Figure 6 As shown; a more preferred example is, as Figure 5 and Figure 7As shown, the pallet support structure 500 and the ventilation hole 133 are at the same horizontal height. However, the pallet support structure 500 includes an L-shaped steel plate 51 and a U-shaped steel plate 52. The short side of the L-shaped steel plate 51 is horizontally arranged, and the two flanges of the U-shaped steel plate 52 are also horizontally arranged. A gap is left between the web of the U-shaped steel plate 52 and the body steel plate 130 of the inner silo wall 131. The upper flange edge of the U-shaped steel plate 52 and the short side edge of the L-shaped steel plate 51 serve as support surfaces. A strip-shaped opening connected to the gap is left between the lower flange edge of the U-shaped steel plate 52 and the body steel plate 130 of the inner silo wall 131. In other examples, the upper flange edge of the U-shaped steel plate 52 and the short side edge of the L-shaped steel plate 51 may also have an opening. This method avoids the medium airflow from blowing directly onto the blocks, allowing most of the airflow to descend first and then diffuse and distribute within each layer of space, avoiding local over-curing of the blocks, and resulting in a more uniform temperature and humidity distribution within each layer of space. The L-shaped steel plate 51 and U-shaped steel plate 52 can be installed with the U-shaped steel by welding or fastener locking, or by the following method: the two ends of the length direction of the L-shaped steel plate 51 are integrally formed with first clamps, and the two ends of the web of the U-shaped steel plate 52 are integrally formed with second clamps 520. The wing plates of the U-shaped steel on the side support 141 and the middle support 142 are provided with slots 140 that are respectively inserted and matched with the first clamps and the second clamps 520. The first clamps and the second clamps 520 are respectively inserted into the slots 140 and fixed. The first clamps and the second clamps 520 respectively have an L-shaped limiting edge that abuts against the inner surface of the wing plate of the U-shaped steel and an arc edge connected to the L-shaped limiting edge and located at the end. When the clamps are fixed, the horizontal edge of the L-shaped limiting edge is in contact with the upper wall of the slot 140 and the vertical edge abuts against the inner surface of the wing plate above the slot 140. L-shaped steel plate 51 serves as part of the support surface of the support plate and also abuts against U-shaped steel plate 52 above it, enhancing the support strength of U-shaped steel plate 52.

[0057] In addition, to reduce heat loss within the kiln, rock wool insulation layers are provided on all three sides of the kiln: the ventilation wall and the sealing wall. The rock wool insulation layers are installed on the outer surface of the outer chamber wall 132, and a decorative steel plate 134 is then installed outside the rock wool insulation layers. The thickness of the rock wool insulation layer is preferably 100mm, with an insulation coefficient of 0.4W / m. 2 •K, achieving excellent temperature resistance and heat insulation performance to maintain the temperature inside the kiln. The kiln side movable door 11 also has a heat insulation structure.

[0058] like Figure 8 As shown, the trolley travel rail 300 in this embodiment uses national standard 55Q light rail. The trolley travel rail 300 is horizontally installed on the base frame 145 and extends horizontally from front to back. After installation, the straightness error is ≤0.1%, ensuring levelness and load-bearing capacity. Two trolley travel rails 300 are provided at the bottom of each curing kiln area.

[0059] Regarding heating and ventilation device 200:

[0060] like Figures 11 to 15 As shown, the heating and ventilation device 200 includes a CO2 input pipe 21, a humid air input pipe 22, a fan 31, a heater 32, an input main pipe 23, a return main pipe 24, an exhaust pipe 28, a safety pressure relief pipe, and an exhaust pipe 29.

[0061] The input end (with a switch valve) of the humid air input pipe 22 is connected to the humid air source, and the output end is connected to the air inlet of the fan 31 through the first flow regulating unit. The input end of the CO2 input pipe 21 is connected to the high-pressure CO2 gas source, and the output end extends into the kiln. A first on / off unit and a first pressure regulating unit are provided on the output end. At the same time, the CO2 input pipe 21 and the humid air input pipe 22 are connected by a three-way pipe to form a CO2 input branch 25. The CO2 input branch 25 is provided with a second on / off unit, a second flow regulating unit, and a second pressure regulating unit. The air outlet of the fan 31 is connected to the main input pipe 23 through the second branch 26, and a heater 32 is provided on the second branch 26. In this way, when the first on / off unit is closed, the carbon dioxide is reduced to the target pressure through the CO2 input branch 25 and then mixed with the humid air input through the humid air input pipe 22. The mixture is then introduced into the main input pipe 23 by the fan 31 and heated by the heater 32 during the process.

[0062] The main input pipe 23 and the main return pipe 24 extend along the length of the kiln body 100, with their front ends near the kiln-side movable door 11 and their rear ends near the kiln-side sealing wall. The main input pipe 23 and the main return pipe 24 are positioned to the left and right of the kiln body 100 in the width direction, with the main input pipe 23 near the right-side kiln-side ventilation wall and the main return pipe 24 near the left-side kiln-side ventilation wall. A first branch pipe 27 connects the main return pipe 24 to the air inlet of the ventilator 31 via a T-junction.

[0063] Input branch pipes are connected to the gas distribution chambers on the right side ventilation wall of the kiln via the main input pipeline 23. These branch pipes guide the heated medium airflow into the corresponding gas distribution chamber, which then flows into the kiln through the ventilation holes 133 on the inner wall 131. Return branch pipes are connected to the gas distribution chambers on the left side ventilation wall of the kiln via the main return pipeline 24. These branch pipes flow into the corresponding gas distribution chambers, allowing the medium airflow entering the gas distribution chamber from the ventilation holes 133 to converge back into the main return pipeline 24, and then return to the ventilator 31 via the first branch 27. This cycle continues. Figure 16As shown, under the preset carbon fixation reaction conditions, the medium airflow circulates between the fan 31, the second branch 26, the main input branch 23, the kiln side ventilation wall, inside the kiln, the opposite kiln side ventilation wall, the return main branch 24, and the first branch 27. The return branch and the input branch are respectively connected to the cover plate by flanges and sealed. The cover plate has a connection port for connecting the return branch and the input branch.

[0064] If the return main pipe 24 and the input main pipe 23 are installed on the second top frame 144, the return main pipe 24 and the input main pipe 23, as well as the matching connecting pipes, are hot-dip galvanized and wrapped with an external insulation structure, which has the standard of corrosion resistance and prevention of condensation and heat loss, and meets the EN1751 airtightness level 4 sealing standard.

[0065] In addition, the exhaust pipe 28 is arranged vertically, with its bottom end leading into the kiln. The exhaust pipe 28 is equipped with a third electric switch valve 34 and a second ventilator 33. When the third electric switch valve 34 is activated and the second ventilator 33 is started, the airflow inside the kiln is discharged through the exhaust pipe 28. One end of the safety relief pipe leads into the kiln, while the other end is connected to the exhaust pipe 28 via a tee pipe. The safety relief pipe is equipped with a safety valve 35, with an adjustable pressure range of ±500 Pa to ±1500 Pa. When the pressure inside the kiln exceeds the set value, it automatically activates to release pressure, ensuring safe system operation. One end of the exhaust pipe 29 leads into the kiln, while the other end is outside the kiln. The exhaust pipe 29 is equipped with a third on / off unit, and its diameter is significantly smaller than that of the exhaust pipe 28.

[0066] The first on / off unit includes a first manual switch valve 37 and a first electric switch valve 36. CO2 first passes through the first manual switch valve 37 and then the first electric switch valve 36. The second on / off unit is either a second manual switch valve 38 or a second electric switch valve. The third on / off unit includes a third manual switch valve 39 and a pneumatic switch valve 310. Both the first and second pressure regulating units use pressure reducing valves 311. Both the first and second flow regulating units use proportional valves 312, allowing for 0-100% opening adjustment with a time not exceeding 15 seconds. The heater 32 is a stainless steel heater equipped with a temperature controller. The ventilator 31 is a stainless steel centrifugal fan, meeting the air exchange requirement of ≥25 times / hour. The second ventilator 33 has a temperature resistance of 90℃ and an air volume greater than 8000 m³ / h, capable of conveying high-temperature and high-humidity airflow, suitable for conveying high-humidity and high-temperature media in curing kilns. All valves and pipelines are hot-dip galvanized.

[0067] The kiln is also equipped with CO2 concentration sensors, temperature sensors, humidity sensors and pressure sensors. These, along with the first electric switch valve 36, the second electric switch valve, the third electric switch valve 34, the pneumatic switch valve 310, the pressure reducing valve 311, the proportional valve 312, the safety valve 35, the heater 32, the ventilator 31 and the second ventilator 33, are all electrically connected to the PLC controller. The PLC controller can be a commercially available product such as Siemens S7-1500. When the pressure, CO2 concentration, humidity, or temperature inside the kiln is abnormal, the preset carbon fixation reaction conditions are restored through coordinated regulation of the opening and closing of the exhaust pipe 29, the opening and closing and adjustment of the CO2 input pipe 21, and the opening and closing and adjustment of the humid air input pipe 22. For example, when the CO2 concentration inside the kiln is lower than the threshold, only the first on / off unit on the CO2 input pipe 21 is opened and the first pressure regulation unit is adjusted to supplement CO2 gas into the kiln; when the humidity inside the kiln is too low, the humid air input pipe 22 is opened and the proportional valve 312 is adjusted to a suitable opening degree, and the exhaust pipe 29 is opened for coordinated regulation; when the temperature inside the kiln is low, the power of the heater 32 is increased.

[0068] Regarding the concealed drainage device 400:

[0069] like Figures 9-10 As shown, the concealed drainage device 400 is installed below the floor inside the kiln body 100. It includes a main drainage pipe 41, branch drainage pipes 42, and connecting pipes 43. One end of each branch drainage pipe 42 is connected to the main drainage pipe 41, and the other end is connected to the connecting pipe 43. Multiple branch drainage pipes 42 are connected to the main drainage pipe 41, and multiple connecting pipes 43 are connected to the same branch drainage pipe 42. The main drainage pipe 41 extends along the front-to-back direction of the kiln body 100, the branch drainage pipes 42 extend along the left-to-right direction of the kiln body 100, and the multiple connecting pipes 43 are spaced apart in the left-to-right direction of the kiln body 100. The spacing is designed according to the size of the kiln body 100 and the amount of condensate to ensure that there are no dead corners for water accumulation on the entire floor inside the kiln. As an example, as shown in the figure, there is one main drainage pipe 41, 17 branch drainage pipes 42, and 7 connecting pipes 43 on the same branch drainage pipe 42. The water inlet pipe 43 is arranged vertically or inclined upwards, and an anti-clogging grating cover is installed at the upper end of the water inlet pipe 43 to prevent brick chips and debris from entering the water inlet pipe. After assembly, the main drainage pipe 41, the branch drainage pipe 42, and the water inlet pipe 43 are all buried in the foundation, and the anti-clogging grating cover is on the ground. One end of the main drainage pipe 41 is equipped with an inspection port 44, and the other end is a drain outlet. The inspection port 44 is located outside the kiln body 100 or in a ground inspection well, which facilitates maintenance personnel to clean the pipe blockage without dismantling the foundation. The foundation is constructed by pouring concrete twice.

[0070] The foregoing has shown and described the basic principles, main features and advantages of this invention. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this invention. Various changes and modifications can be made to this invention without departing from the spirit and scope of this invention. All such changes and modifications fall within the scope of this invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A non-fired block carbon fixation and curing kiln, characterized in that, include: The kiln body includes two kiln side ventilation walls arranged opposite to each other, and each kiln side ventilation wall forms a gas distribution chamber. The heating and ventilation device includes an input main pipeline, a return main pipeline, and a first branch and a second branch connecting the input main pipeline and the return main pipeline. The second branch is provided with a fan and a heater, and the first branch is connected to the air inlet of the fan. The input main pipeline is connected to the kiln side ventilation wall on one side, and the return main pipeline is connected to the kiln side ventilation wall on the other side. A pallet support structure is used to support both sides of the pallet. It is set inside the kiln body and has multiple layers arranged at intervals to form multiple curing layers in the height direction. The ventilation wall on the side of the kiln facing the inside of the kiln has ventilation holes that communicate with the inside of the kiln. The ventilation holes are distributed in multiple layers in the height direction so that each curing layer space is equipped with a ventilation hole.

2. The carbon sequestration and curing kiln for non-fired blocks according to claim 1, characterized in that: The kiln body also includes a kiln side movable door, a kiln body frame, a kiln top platform and a kiln side sealing wall fixedly installed on the kiln body frame. The kiln side ventilation wall is installed on opposite sides of the kiln body frame and is arranged along the length of the kiln body. The kiln side movable door and the kiln side sealing wall are installed on opposite sides of the kiln body frame and are arranged along the width of the kiln body. The kiln top platform is installed at the top of the kiln body frame.

3. The carbon sequestration and curing kiln for non-fired blocks according to claim 1, characterized in that: The kiln frame includes a base frame, side uprights, and a first top frame. The base frame is arranged at equal intervals along the front-to-back direction of the kiln body. The side uprights are located on the left and right sides of the base frame and are fixed to the base frame respectively. The first top frame is fixed to the upper part of the side uprights. The kiln top platform is installed on the first top frame. The kiln side ventilation wall and the kiln side sealing wall are both installed on the side uprights. The pallet support structure is installed on the side uprights and extends along the length of the kiln body respectively.

4. The carbon sequestration and curing kiln for non-fired blocks according to claim 3, characterized in that: The kiln frame also includes a central support frame, which is located between the side supports and fixed to the base frame. The central support frame and the side supports are directly opposite each other in the width direction of the kiln body. The first top frame is also installed on the upper part of the central support frame. The left and right sides of the central support frame are provided with support plate structures. The central support frame divides the kiln body into interconnected curing kiln areas. Each curing kiln area is equipped with multiple layers of support plate structures, and the same layer of support plate structures in the same curing kiln area is at the same horizontal height.

5. The carbon sequestration and curing kiln for non-fired blocks according to claim 3, characterized in that: The kiln side ventilation walls are composed of multiple ventilation wall units arranged along the length of the kiln body. Each ventilation wall unit includes an outer chamber wall and an inner chamber wall. The inner chamber wall and the outer chamber wall, together with the side support frames, form gas distribution chambers between two adjacent side support frames. Input branch pipes are connected to the corresponding gas distribution chambers on the input main pipeline at the positions corresponding to the gas distribution chambers on the same side of the kiln side ventilation wall. The input branch pipes lead to the corresponding gas distribution chambers on the return main pipeline. The return branch pipes are connected to the corresponding gas distribution chambers on the same side of the kiln side ventilation wall. The ventilation holes are provided on the inner chamber wall.

6. The carbon sequestration and curing kiln for non-fired blocks according to claim 5, characterized in that: Both the inner and outer warehouse walls are made of multiple warehouse steel plates spliced ​​together by fasteners, and sealing strips are provided at the splicing points of the warehouse steel plates. The ventilation holes are provided on the warehouse steel plates of the inner warehouse wall.

7. The carbon sequestration and curing kiln for non-fired blocks according to claim 6, characterized in that: The silo body steel plate is composed of a square main plate and side folded plates formed by bending the square main plate on all four sides with the same orientation. Each of the four side folded plates has a mounting hole. The side folded plates are spliced ​​with the adjacent silo body steel plates and side uprights by fasteners.

8. The carbon sequestration and curing kiln for non-fired blocks according to claim 1, characterized in that: The curing kiln also includes a concealed drainage device, which is located below the ground inside the kiln body to drain water from the ground inside the kiln body.

9. The carbon sequestration and curing kiln for non-fired blocks according to claim 1, characterized in that: The ventilation holes are located above each layer of the pallet support structure, or the pallet support structure and the ventilation holes are at the same horizontal level and there is a gap between the pallet support structure and the kiln side ventilation wall, and the lower end face of the pallet support structure has a strip opening that communicates with the gap.

10. The non-fired block carbonization curing kiln according to any one of claims 1 to 9, characterized in that: The heating and ventilation device further includes a CO2 input pipeline, a humid air input pipeline, a waste gas discharge pipe, a safety pressure relief pipe, and an exhaust pipe. The input end of the humid air input pipeline is connected to a humid air source, and the output end is connected to the air inlet of the ventilator through a first flow regulating unit. The input end of the CO2 input pipeline is connected to a high-pressure CO2 gas source, and the output end extends into the kiln body and is equipped with a first on / off unit and a first pressure regulating unit. The CO2 input pipeline and the humid air input pipeline are respectively connected by a T-junction to form a CO2 input branch. The CO2 input branch is equipped with a second on / off unit, a second flow regulating unit, and a second pressure regulating unit. One end of the exhaust gas discharge pipe is inserted into the kiln body and the other end is outside the kiln. One end of the safety pressure relief pipe is inserted into the kiln body and the other end is connected to the exhaust gas discharge pipe through a three-way pipe. The exhaust gas discharge pipe is equipped with a third electric switch valve and a second ventilator. The safety pressure relief pipe is equipped with a safety valve. One end of the exhaust pipe is inserted into the kiln body and the other end is outside the kiln. The exhaust pipe is equipped with a third on / off unit.

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