Kiln for producing sodium silicate

Abstract

This application discloses a kiln for sodium silicate production, relating to the field of kiln technology, including a molten pool; it also includes a heat storage component; the heat storage component includes checker bricks, ball bearings, annular grooves, ventilation holes, a drive component, and a heat storage tank; the heat storage tank is fixed to one side of the molten pool, and the heat storage tank consists of an inner tank and an outer tank; multiple sets of checker bricks are fixed inside the inner tank, and the inner tank is connected to the molten pool; the checker bricks consist of upper bricks, middle bricks, and lower bricks; the annular groove is opened on the upper side of the lower brick, the lower side of the upper brick, and the upper and lower sides of the middle brick, and the ball bearings are evenly embedded in the annular groove; the ventilation holes are opened inside the upper brick, middle brick, and lower brick; the ventilation holes on the upper and lower bricks have the same diameter and number, and the number of ventilation holes on the middle brick is twice that of the upper brick; the drive component is installed at the top of the heat storage tank, and the output end of the drive component is connected to the middle brick; it can realize the dynamic adjustment of the ventilation hole diameter and ventilation cross-section of the heat storage structure according to the actual working conditions of the flue gas.

Description

Technical Field

[0001] This invention relates to the field of kiln technology, and in particular to a kiln for sodium silicate production. Background Technology

[0002] Sodium silicate, also known as water glass, is an inorganic chemical raw material widely used in industrial production. It is widely used in many fields such as building materials, chemicals, metallurgy, and papermaking. The production of sodium silicate usually requires the raw materials to undergo a high-temperature melting reaction in a kiln. The heat utilization rate of the kiln directly affects the production energy consumption and product cost.

[0003] Existing sodium silicate kiln heat storage structures mostly adopt a grid brick structure with fixed aperture and fixed arrangement. The ventilation aperture and ventilation cross section of the grid bricks are fixed values. In actual production, the amount of material fed into the kiln flues dynamically, which directly leads to significant changes in flue gas flow rate, flue gas velocity and flue gas temperature. As a result, the grid bricks with fixed parameters cannot adjust the heat storage ventilation parameters according to the actual flue gas conditions, so the heat storage efficiency can never match the actual flue gas conditions. Summary of the Invention

[0004] This application provides a kiln for sodium silicate production, which solves the problem that existing heat storage structures have fixed ventilation apertures and cross-sections, and the kiln feed rate fluctuates dynamically, leading to significant changes in flue gas flow rate, flue gas velocity, and flue gas temperature. The checker bricks cannot adjust the heat storage ventilation parameters according to the actual flue gas conditions, resulting in the heat storage efficiency always failing to match the actual flue gas conditions. This application enables the ventilation aperture and cross-section of the heat storage structure to be dynamically adjusted according to the actual flue gas conditions, so that the heat storage parameters can match the dynamic changes in flue gas flow rate, velocity, and temperature, thereby improving the heat storage efficiency of the kiln under different feed rates.

[0005] This application provides a kiln for sodium silicate production, including a molten pool;

[0006] It also includes heat storage components;

[0007] The heat storage component includes checker bricks, ball bearings, annular grooves, ventilation holes, a drive assembly, and a heat storage tank.

[0008] The heat storage tank is fixed to one side of the molten pool, and the heat storage tank consists of an inner tank and an outer tank.

[0009] The inner tank is fixed inside the outer tank, with a gap between the inner tank and the outer tank;

[0010] The inner tank is fixed with multiple sets of grid bricks, and the inner tank is connected to the molten pool;

[0011] The grid bricks consist of an upper layer of bricks, a middle layer of bricks, and a lower layer of bricks;

[0012] The annular groove is formed on the upper side of the lower layer brick, the lower side of the upper layer brick, and the upper and lower sides of the middle layer brick. Multiple balls are evenly embedded in the annular groove, and the balls can roll along the annular groove.

[0013] The ventilation holes are located inside the upper, middle, and lower layers of bricks, and the ventilation holes penetrate vertically through a single grid brick.

[0014] The ventilation holes on the upper and lower bricks have the same diameter and number. The number of ventilation holes on the middle brick is twice that on the upper brick. The middle brick has two types of ventilation holes arranged in an alternating pattern: the small-diameter ventilation holes are smaller than the ventilation holes on the upper brick, and the large-diameter ventilation holes are larger than the ventilation holes on the upper brick.

[0015] The drive assembly is installed at the top of the heat storage tank, and its output end is connected to the transmission of the middle layer bricks, enabling the middle layer bricks to rotate along the annular groove.

[0016] Furthermore, the inner tank is equipped with three layers of grid bricks;

[0017] The bottom of the inner tank is fixed with support bricks, which support the weight of the lower grid bricks.

[0018] The annular support platform installed on the inner wall of the inner tank is constructed of refractory bricks.

[0019] The bottom edge of the lower brick protrudes from the brick body and is embedded in the annular groove on the annular support platform, and the top edge of the upper brick protrudes from the brick body and is embedded in the annular groove on the annular support platform.

[0020] Furthermore, an air blowing pipe is fixed to the side wall of the inner tank;

[0021] The air blowing pipe extends from the side wall of the outer tank and can be connected to an external compressed air source to introduce a high-pressure pulsed airflow into the inner tank.

[0022] Furthermore, the ventilation holes on the grid bricks have different diameters, with the largest diameter in the uppermost grid brick, the second largest in the middle grid brick, and the largest diameter in the lowermost grid brick.

[0023] The ventilation holes on the middle layer bricks have chamfered ends, so that the connected ventilation holes form a funnel-shaped airflow channel that is smaller in the middle and larger at both ends.

[0024] Furthermore, the drive assembly includes a drive motor, a gear ring, a transmission shaft, and gears;

[0025] The drive shaft is fixed to the rotating shaft of the drive motor, and the gear is fixed to the drive shaft;

[0026] The inner tank sidewall has an opening for gear and gear ring to mesh. The gear ring is fixed to the sidewall of the middle brick and meshes with the gear for transmission.

[0027] Furthermore, the drive assembly is provided in three groups, which respectively control the rotation of the upper grid bricks, the middle grid bricks, and the middle bricks on the lower grid bricks.

[0028] Furthermore, the opening sidewall of the inner tank is provided with a sealing ring;

[0029] The sealing ring is made of high-temperature resistant heat-insulating material.

[0030] Furthermore, an air inlet pipe is fixed on the top side wall of the outer tank;

[0031] The air intake pipe is equipped with a blower, which drives air into the gap between the outer tank and the inner tank.

[0032] The inner tank has multiple air inlets at the bottom of its side wall, which are distributed around the perimeter of the bottom of the inner tank.

[0033] Furthermore, the heat storage tank is fixed to the base;

[0034] The heat storage tank has a discharge port at the bottom.

[0035] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0036] By driving the rotation of the middle-layer bricks at different levels through the drive components, the diameter of the connected ventilation holes can be adjusted, allowing for flexible adjustment of the flue gas flow velocity. This enables the ventilation volume to be adjusted according to changes in the flue gas, solving the problem that the ventilation hole diameter and ventilation cross-section of the existing heat storage structure are fixed values, while the kiln feed rate fluctuates dynamically, resulting in significant changes in flue gas flow rate, flue gas velocity, and flue gas temperature. The checker bricks cannot adjust the heat storage ventilation parameters according to the actual flue gas conditions. This new system enables the ventilation hole diameter and ventilation cross-section of the heat storage structure to be dynamically adjusted according to the actual flue gas conditions, allowing the heat storage parameters to match the dynamic changes in flue gas flow rate, velocity, and temperature, thereby improving the heat storage efficiency of the kiln under different feed rates. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of a kiln for sodium silicate production according to the present invention;

[0038] Figure 2 This is a schematic cross-sectional view of the kiln used for sodium silicate production according to the present invention.

[0039] Figure 3 This is a schematic diagram of the specific structure of the checker bricks in a kiln for sodium silicate production according to the present invention;

[0040] Figure 4 This is a schematic diagram of the connection relationship between the checker bricks and ball bearings in a kiln for sodium silicate production according to the present invention.

[0041] Figure 5 This is a schematic cross-sectional view of the checker brick structure of a kiln for sodium silicate production according to the present invention.

[0042] Figure 6 This is a schematic diagram of the connection relationship between the ventilation holes and checker bricks in a kiln for sodium silicate production according to the present invention.

[0043] Figure 7 This is a cross-sectional view of the heat storage tank of a kiln for sodium silicate production according to the present invention.

[0044] Figure 8 This invention relates to a kiln for sodium silicate production. Figure 7 A partially enlarged structural diagram;

[0045] Figure 9 This invention relates to a kiln for sodium silicate production. Figure 5 A partially enlarged structural diagram;

[0046] Figure 10 This is a schematic diagram of the connection relationship between the inner tank and the air blowing pipe of a kiln for sodium silicate production according to the present invention.

[0047] In the diagram: 101, molten pool; 102, air blowing pipe; 103, air inlet pipe; 104, small furnace; 105, base; 106, air inlet hole;

[0048] 200. Heat storage component; 201. Outer tank; 202. Drive motor; 203. Drive shaft; 204. Gear; 205. Checker brick; 206. Inner tank; 207. Support brick; 208. Ball bearing; 209. Annular groove; 210. Upper layer brick; 211. Lower layer brick; 212. Middle layer brick; 213. Gear ring; 214. Ventilation hole; 215. Sealing ring; 216. Drive component; 217. Annular support platform; 220. Heat storage tank. Detailed Implementation

[0049] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0050] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] like Figures 1 to 10As shown, this application proposes a kiln for sodium silicate production, including a molten pool 101 in which sodium silicate undergoes a melting reaction; it also includes a heat storage component 200; the heat storage component 200 includes checker bricks 205, ball bearings 208, annular grooves 209, ventilation holes 214, a drive component 216, and a heat storage tank 220; the heat storage tank 220 is fixed to one side of the molten pool 101, and the heat storage tank 220 is composed of an inner tank 206 and an outer tank 201; the inner tank 206 is fixed inside the outer tank 201, with a gap between the inner tank 206 and the outer tank 201, and the bottom of the inner tank 206 is connected to the outer tank 201, allowing external air to enter the inner tank 206 through the gap between the inner tank 206 and the outer tank 201; the inner tank 206 is solid inside... Multiple sets of checker bricks 205 are provided. The inner tank 206 is connected to the molten pool 101. The checker bricks 205 are used to absorb and store the residual heat in the flue gas discharged from the molten pool 101. When air is introduced into the molten pool 101, cold air enters the heat storage tank 220, absorbs heat and rises in temperature after passing through the preheated checker bricks 205, and then the heated air is introduced into the molten pool 101 to participate in the combustion reaction. The checker bricks 205 are composed of upper bricks 210, middle bricks 212 and lower bricks 211. The annular grooves 209 are opened on the upper side of the lower bricks 211, the lower side of the upper bricks 210 and the upper and lower sides of the middle bricks 212. Multiple balls 208 are evenly embedded in the annular grooves 209 and can roll along the annular grooves 209. The ventilation holes 214 are opened on the upper bricks 210. Inside the middle layer bricks 212 and the lower layer bricks 211, ventilation holes 214 penetrate vertically through individual grid bricks 205, allowing smoke to flow through each layer of grid bricks 205 via the ventilation holes 214. The upper layer bricks 210 and the lower layer bricks 211 have the same number and diameter of ventilation holes 214. The middle layer bricks 212 have twice the number of ventilation holes 214 as the upper layer bricks 210. Furthermore, the ventilation holes 214 on the middle layer bricks 212 have two diameters: small-diameter ventilation holes 214 and large-diameter ventilation holes 214, arranged alternately. The diameter of the small-diameter ventilation holes 214 is smaller than that of the ventilation holes 214 on the upper layer bricks 210, and the diameter of the large-diameter ventilation holes 214 is larger than that of the ventilation holes 214 on the upper layer bricks 210. The drive assembly 216 is installed at the top of the heat storage tank 220. The output end of the drive assembly 216 is connected to the middle layer brick 212, which can drive the middle layer brick 212 to rotate along the annular groove 209. This allows the ventilation holes 214 of different diameters on the middle layer brick 212 to be aligned or staggered with the ventilation holes 214 of the upper layer brick 210 and the lower layer brick 211. This allows the flue gas to form airflows of different velocities when it flows through the middle layer brick 212, extending the residence time of some flue gas inside the checker brick 205. When it is necessary to quickly discharge the flue gas, the middle layer brick 212 can be rotated so that the large diameter ventilation holes 214 of the middle layer brick 212 are completely aligned with the ventilation holes 214 of the upper and lower layers, increasing the ventilation cross section, reducing airflow resistance, and ensuring smooth discharge of flue gas.When enhanced waste heat recovery is required, rotating the middle layer brick 212 aligns some of the small-diameter ventilation holes 214, reducing the diameter of some ventilation paths, slowing down the flow rate of flue gas at the corresponding locations, and allowing for more thorough heat exchange between the flue gas and the checker bricks 205.

[0053] Preferred, such as Figure 2 As shown, the inner tank 206 is provided with three layers of grid bricks 205. A support brick 207 is fixed at the bottom of the inner tank 206. The support brick 207 supports the weight of the lower grid bricks 205 and fixes the bottom grid bricks 205 in the inner tank 206. The middle and upper grid bricks 205 are positioned and installed by an annular support platform 217 set on the inner wall of the inner tank 206. The annular support platform 217 is constructed of refractory bricks. The bottom edge of the lower brick 211 protrudes from the brick body and is embedded in the annular groove 209 on the annular support platform 217. The top edge of the upper brick 210 protrudes from the brick body and is embedded in the annular groove 209 on the annular support platform 217, ensuring that the lower brick 211 and the upper brick 210 will not rotate during the rotation of the middle brick 212.

[0054] Preferably, a pre-fabricated high-temperature solid lubricating ceramic strip is embedded in the annular groove 209. This high-temperature solid lubricating ceramic strip is a ceramic lubricating block sintered from calcium zirconate and barium fluoride. Under the high-temperature, oxygen-rich conditions of the regenerator chamber (1000℃~1300℃), the lubricating block experiences no oxidation loss, and the molten alkaline silicate slag carried by the flue gas cannot adhere to the ceramic surface. It automatically falls off after cooling, preventing the formation of a hard glassy body by filling the gaps between the balls. This reduces the friction experienced by the middle layer brick 212 during rotation, making the adjustment of the middle layer brick 212 smoother. Simultaneously, it avoids direct contact and friction between metal components, preventing the generation of debris. The ball bearing 208 is made of a high-temperature resistant alloy, which is a cobalt-based cast high-temperature alloy. It can maintain its structural strength under high-temperature conditions of around 1000℃ for a long time without deformation or oxidation failure. Combined with a high-temperature solid lubricating ceramic strip, it further reduces rotational resistance and ensures the adjustment flexibility of the middle layer brick 212. The ball bearing 208 is embedded in the annular groove 209 on the upper layer brick 210 and the lower layer brick 211. The protruding part of the ball bearing 208 can roll contact with the upper and lower sides of the middle layer brick 212, which not only provides support and limit but also does not hinder the rotation operation of the middle layer brick 212.

[0055] Preferably, considering that the regenerator chamber of the sodium silicate kiln is usually at an extremely high temperature of 1000℃ to 1300℃, and the flue gas carries a large amount of strongly alkaline sodium carbonate and sodium sulfate dust and sodium silicate vapor, after the dust enters the regenerator chamber, it will undergo eutectic melting at a high temperature above 1000℃ to form high-viscosity molten glass liquid and molten salt slag, therefore, a ring-shaped slag-blocking protrusion 5mm to 8mm higher than the brick surface is integrally cast on the lower surface of the upper brick 210, the upper and lower surfaces of the middle brick 212, and the outer side of the annular groove on the upper surface of the lower brick 211, forming an outer high and inner low guiding slope. When the high-temperature molten silicate slag flows along the brick surface, it is intercepted by the protrusion and flows along the slope to the ventilation holes of the checker bricks, and drips down to the slag bin at the bottom of the regenerator by gravity.

[0056] Preferably, a labyrinth sealing structure is coaxially arranged on the inner side of the two-stage stepped annular slag-blocking weir and on the outer periphery of the annular groove 209. The labyrinth sealing structure is composed of multiple concentrically arranged labyrinth teeth that cooperate with corresponding labyrinth grooves. Specifically, on the lower surface of the upper brick 210 and the upper surface of the lower brick 211, in the annular area between the annular groove 209 and the two-stage stepped slag-blocking weir, 3 to 4 concentric annular labyrinth teeth are integrally cast with the brick body. The labyrinth teeth have a rectangular cross-section, a tooth height of 8 mm to 10 mm, and a tooth width and tooth spacing of 10 mm. The thickness ranges from 1 mm to 12 mm. Correspondingly, the upper and lower end faces of the middle layer brick 212 are provided with matching labyrinth grooves at positions opposite to the labyrinth teeth. The depth of the grooves is 2 mm to 3 mm greater than the height of the labyrinth teeth, allowing the labyrinth teeth to be embedded in the corresponding labyrinth grooves. A 1 mm to 2 mm assembly gap is reserved between the tooth top and the groove bottom, and between the tooth side and the groove wall, forming multiple tortuous airflow channels that significantly extend the flow path length for flue gas intrusion. The annular support platform 217 has a closed annular ventilation channel embedded inside, which runs along the circumference of the inner tank 206. The annular ventilation channel is arranged in a circular pattern. The air inlet of the annular ventilation channel is led out to the outside of the outer tank 201 through an air-sealed air inlet, and can connect to a branch pipe of the blowing pipe 102. On the side of the annular ventilation channel facing the labyrinth seal, multiple sets of outlet micro-holes are evenly opened circumferentially. These outlet micro-holes connect to the inner gap at the root of the labyrinth seal structure, allowing compressed air to be evenly delivered circumferentially into the inner ring of the labyrinth seal. During normal kiln operation, compressed air is continuously supplied to the annular ventilation channel, ensuring that the air pressure on the outlet side of the labyrinth seal is higher than the flue gas pressure inside the heat storage tank 220. Within the winding labyrinthine passage, a continuous micro-positive pressure air curtain is formed from the inside out. When the high-temperature flue gas carrying molten slag flows over the surface of the checker brick 205, the liquid-phase molten silicate is first intercepted and guided by the two-stage stepped annular slag-blocking weir. When the remaining suspended alkaline dust and fine molten droplets that diffuse with the airflow reach the labyrinth sealing area, they are pushed back by the continuously overflowing clean airflow and cannot invade the inner annular groove 209 ball track and the meshing area of ​​the toothed ring 213. This can reduce the deposition of suspended particles at the moving mechanism and reduce the risk of ball jamming and tooth surface jamming.

[0057] Preferably, considering that under high-temperature conditions, the flue gas carrying molten alkaline silicate slag has strong wetting and climbing characteristics and capillary penetration characteristics, and suspended alkaline dust is easy to settle and accumulate in the ball bearing annular groove and transmission gear ring gap, and the solidification of slag after alternating hot and cold can easily cause the rotating mechanism to jam and fail, the slag-blocking protrusion adopts a two-stage stepped annular slag-blocking weir, with the total height of the two-stage slag-blocking weir set to 20mm to 25mm; the height of the first-stage outer weir is 12mm, and a 15° outward inclined guide slope is set on the outer side of the weir body, with an overall structure of high outside and low inside. The large stream of molten silicate slag flowing in the kiln is completely intercepted after contacting the outer weir, and flows down along the guide slope by its own gravity, directly flowing into the ventilation hole 214 of the checker brick 205, and finally dripping into the slag bin at the bottom of the heat storage tank 220 for centralized discharge; a second-stage inner weir is coaxially set on the inner side of the first-stage outer weir, with a height of 8mm, and a gap is reserved between the first-stage outer weir and the second-stage inner weir. The annular slag collection and diversion channel, with its two-stage weir forming a height difference isolation barrier, effectively blocks the molten alkali slag from climbing and seeping inward along the porous capillary gaps of the brick body, preventing the molten slag from flowing over the slag-blocking structure into the annular groove 209 assembled with the inner ball bearings 208. The two-stage stepped annular slag-blocking weir is integrally cast with the checker brick 205 body. The surfaces of the two-stage stepped annular slag-blocking weir and the working surfaces of the checker brick 205 in contact with the molten slag are all treated with a vacuum impregnation in-situ sintering process for surface alkali-resistant modification. After the precursor sol containing strontium zirconium acid components is infiltrated into the surface pores of the checker brick 205, a dense alkali-resistant ceramic phase is generated in-situ on the surface of the brick body after high-temperature sintering. This prevents the molten silicate slag from spreading and adhering on the coating surface, causing it to roll off only in the form of liquid droplets, further eliminating the basis for capillary climbing of slag. This ensures that it will not accumulate around the ball bearing track, while improving the long-term alkali corrosion resistance and wettability of the slag-blocking part.

[0058] Preferred, such as Figure 9 As shown, the large and small ventilation holes 214 on the middle layer brick 212 are provided with 45° expansion guide chamfers at both ends, so that the connected ventilation holes 214 form a funnel-shaped airflow channel with a small middle and large ends, and there is no right-angle sudden change when the airflow enters and exits the brick hole; when the middle layer brick rotates and is misaligned, and the hole is partially blocked, the expansion chamfer forms a continuous and smooth transition flow channel, avoiding the local airflow drastic contraction and vortex pressurization caused by the right-angle step, so as to reduce the overall flue gas flow resistance and thus suppress the abnormal rise of the kiln back pressure.

[0059] Preferably, the ventilation holes 214 on the three layers of checker bricks 205 have different diameters. The uppermost checker brick 205 has the smallest diameter, the middle checker brick 205 has the next smallest diameter, and the lowermost checker brick 205 has the largest diameter. When high-temperature flue gas enters the inner tank 206, the flue gas first passes through the upper checker brick 205 with the smallest diameter. At this time, the airflow is divided into finer streams, which can fully exchange heat with the surface of the checker brick 205. After the initial heat retention is completed, the flue gas enters the middle checker brick 205. The ventilation holes 214 with slightly larger diameters can prevent the airflow velocity from dropping too quickly, while continuing to complete heat exchange. Finally, the flue gas is discharged through the lower checker brick 205 with the largest diameter. The large diameter can reduce the resistance to flue gas discharge, avoid problems such as poor flue gas discharge and abnormal pressure rise inside the kiln, and ensure smooth flue gas flow, thereby improving heat storage efficiency.

[0060] Preferably, the ventilation holes 214 on the upper layer checker bricks 205 and the lower layer bricks 211 have a diameter of 30mm, and the ventilation holes 214 on the middle layer bricks 212 have diameters of 27mm and 33mm. The ventilation holes 214 on the upper layer checker bricks 205 and the lower layer bricks 211 have a diameter of 40mm, and the ventilation holes 214 on the middle layer bricks 212 have diameters of 35mm and 45mm. Considering the differences in flue gas flow rate under different working conditions, a large feed rate results in a large flue gas flow rate, requiring a faster heat exchange rate and exhaust efficiency, leading to a shorter residence time of the flue gas in the heat storage tank 220, which cannot fully complete heat exchange. Therefore, both the upper layer checker bricks 205 and the middle layer bricks 212 on the middle layer checker bricks 205 use smaller diameter ventilation holes. The ventilation holes 214 on the middle layer brick 212 are aligned with the ventilation holes 214 on the other two bricks. By reducing the diameter of the holes, the heat exchange area is increased, and the high-temperature flue gas is not discharged quickly without sufficient heat exchange, which would cause heat waste. When the feed amount is small and the flue gas flow is low, the flue gas stays in the heat storage tank 220 for too long. The heat is excessively absorbed by the checker bricks 205, resulting in excessively low flue gas temperature. This leads to an aggravation of the heat storage imbalance between the two heat storage tanks 220. Therefore, the ventilation holes 214 with larger diameters on the middle layer brick 212 are aligned with the ventilation holes 214 on the other two bricks to increase the flue gas flow area, accelerate the flue gas discharge speed, avoid excessive heat absorption due to excessive flue gas residence time, ensure the heat balance between the two heat storage tanks 220, adapt to the production needs under different feed conditions, and maintain stable heat storage and heat exchange efficiency.

[0061] Preferably, the upper and middle checker bricks 205 are magnesia bricks. Magnesia bricks have excellent high-temperature resistance and resistance to alkaline slag erosion, and can adapt to the high-temperature flue gas environment above the molten pool 101 with alkaline impurities, thus extending the service life of the upper checker bricks 205. The lower checker bricks 205 are clay bricks. Clay bricks have low production costs and good resistance to low-temperature erosion, and can adapt to the flue gas environment below the heat storage tank 220 with relatively low temperature and different impurity characteristics. A 10mm gap is left between the checker bricks 205 and the inner wall of the heat storage tank 220 to allow space for the thermal expansion and deformation of the checker bricks 205, thus preventing the checker bricks 205 from cracking due to thermal compression.

[0062] Preferably, considering that the temperature of the flue gas has decreased and the flow rate has slowed down when it flows to the lower layer of the heat storage tank 220, the lower layer checker bricks 205 only need to ensure stable flow. Therefore, the ventilation holes 214 of the upper layer bricks 210 and lower layer bricks 211 on the lower layer checker bricks 205 have a diameter of 50mm, and the ventilation holes 214 of the middle layer bricks 212 have diameters of 50mm and 40mm. During normal ventilation, the 50mm ventilation hole 214 on the middle layer bricks 212 and the 50mm ventilation holes 214 on the other two upper and lower bricks are used. 4. Alignment ensures normal flue gas flow. Since the airflow velocity is lowest in the lower area of ​​the heat storage tank 220 and dust settling is most significant, when the lower ventilation holes 214 accumulate a lot of dust and become blocked during production, the middle brick 212 is rotated to align the 40mm ventilation holes 214 with other ventilation holes 214, thereby increasing the airflow velocity and flushing out the dust accumulated at the blockage point. This achieves self-cleaning of the ventilation holes 214 and prevents the blockage in the lower layer from affecting the overall flue gas flow and heat exchange effect of the heat storage tank 220.

[0063] Preferably, the drive assembly 216 includes a drive motor 202 fixed to the top of the outer wall of the outer tank 201, a gear ring 213 sleeved on the outside of the middle layer brick 212, and a gear 204 fixed on the transmission shaft 203. The transmission shaft 203 is fixed on the rotating shaft of the drive motor 202 and is located in the gap between the outer tank 201 and the inner tank 206. The side wall of the inner tank 206 has an opening for the gear 204 and the gear ring 213 to mesh. The gear ring 213 meshes with the output end of the drive motor 202 through the gear 204. Starting the drive motor 202 can drive the middle layer brick 212 to rotate smoothly. An integrated annular load-bearing support ring is set on the bottom outer edge of the 12, and the load-bearing support ring is fixed on the inner side wall of the inner tank 206. The annular load-bearing support ring is cast from Inconel 600 nickel-based high-temperature alloy. Multiple sets of high-temperature heavy-duty support rollers are evenly arranged around the circumference above the annular load-bearing support ring. The support roller base is made of K640 cobalt-based high-temperature alloy, and the support roller surface is plasma-sprayed with a strontium zirconate wear-resistant and heat-insulating ceramic coating. The support rollers are in contact with the bottom of the middle layer brick 212. The several tons of self-weight of the middle layer brick 212 and the sliding friction load are completely supported by the annular load-bearing support ring and multiple sets of support rollers, which can reduce the frictional resistance during rotation and thus significantly reduce the meshing shear load.

[0064] Preferred, such as Figure 5 and Figure 8 As shown, considering that checker bricks are brittle ceramic materials with high compressive strength but extremely poor tensile and shear strength, a corundum-zirconate composite refractory transition ring is set between the annular load-bearing support ring and the middle layer brick 212. A gap is left between the middle layer brick 212 and the inner wall of the inner tank 206 for setting the transition ring. The transition ring is cast and fixed to the outer ring of the middle layer brick 212, and the transition ring and the toothed ring 213 are integrally cast. The transition ring is in contact with the aforementioned annular load-bearing support ring, which can disperse the local compressive stress brought by the support ring support and prevent brittle magnesia bricks and clay bricks from chipping and cracking due to local concentrated loads. At the same time, the transition ring can prevent flue gas molten alkali slag from seeping into the gap of the support roller.

[0065] Preferably, the drive assembly 216 has three sets, which respectively control the rotation of the middle bricks 212 on the upper grid brick 205, the middle grid brick 205 and the lower grid brick 205. It can adjust the diameter of the ventilation holes 214 in different areas according to the change of flue gas flow, so that the airflow velocity of different height sections is always maintained in a reasonable range. This can avoid insufficient heat exchange due to excessive flow velocity, and also avoid a large amount of dust settling and clogging the duct due to excessively slow flow velocity.

[0066] Preferred, such as Figure 8As shown, the side wall of the inner tank 206 has an opening with a sealing ring 215. The sealing ring 215 is made of high temperature resistant heat insulation material. It can fill the gap between the opening and the gear 204 while withstanding the high temperature environment inside the kiln. It can prevent high temperature flue gas from leaking out from the meshing gap, reducing heat waste, and prevent cold air from entering the inner tank 206 and disrupting the internal airflow field.

[0067] Preferred, such as Figure 1 As shown, an air inlet pipe 103 is fixed on the top side wall of the outer tank 201. A blower is installed inside the air inlet pipe 103. The blower drives air into the gap between the outer tank 201 and the inner tank 206. The air in the gap flows from top to bottom. During the flow, it absorbs the heat emitted outward from the tank wall of the inner tank 206, preheating the cold air entering the inner tank 206. The preheated cold air enters the inner tank 206 through the air inlet hole 106 at the bottom of the inner tank 206.

[0068] Preferred, such as Figure 10 As shown, multiple air inlets 106 are provided, and the air inlets 106 are distributed around the periphery of the bottom of the inner tank 206, so that the preheated air can enter the inner tank 206 evenly from all parts of the bottom, making the overall heating of the grid bricks 205 in the inner tank 206 more uniform and avoiding insufficient local heat exchange.

[0069] Preferred, such as Figure 1 As shown, there are two heat storage tanks 220. The inner tank 206 and the molten pool 101 are connected by a small furnace 104. The small furnace 104 is fixed to the side wall of the inner tank 206 near the top and extends out through the side wall of the outer tank 201. The two heat storage tanks 220 alternately perform heat storage and heat release operations. When one heat storage tank 220 completes heat storage, the flue and air supply passage are switched so that the heat released by the other heat storage tank 220 preheats the incoming air. The preheated high-temperature air is sent into the molten pool 101 to participate in combustion. One of the small furnaces 104 is used to introduce the high-temperature flue gas generated in the molten pool 101 into the inner tank 206 of the heat storage tank 220. The other small furnace 104 sends the preheated high-temperature air in the inner tank 206 into the molten pool 101 to provide sufficient oxygen for fuel combustion in the molten pool 101.

[0070] Preferably, an air blowing pipe 102 is fixed to the side wall of the inner tank 206. The air blowing pipe 102 extends out from the side wall of the outer tank 201. The air blowing pipe 102 can be connected to an external compressed air source to introduce a high-pressure pulse airflow into the inner tank 206. The height of the air blowing pipe 102 is the same as the height of the annular support platform 217, so that the airflow entering the inner tank 206 can be blown into the gaps between adjacent checker bricks 205. The high-pressure airflow can impact the floating dust and impurities attached to the gaps of the checker bricks 205, peeling the impurities off the surface of the checker bricks 205, avoiding pore blockage and affecting the heat storage and heat exchange effect. The peeled impurities are discharged from the heat storage tank 220 along with the flue gas.

[0071] Preferably, the heat storage tank 220 is fixed on the base 105, and the base 105 supports and fixes the heat storage tank 220 on the mounting plane. The bottom of the heat storage tank 220 is provided with a discharge port, which can periodically discharge the dust accumulated at the bottom of the inner tank 206.

[0072] Preferably, the outer tank 201 is made of heat-insulating refractory concrete, which can reduce the heat stored in the heat storage tank 220 from dissipating outward, reduce heat loss, and improve the overall heat utilization efficiency. The inner tank 206 is made of high-temperature resistant and wear-resistant refractory bricks, which can withstand repeated scouring and temperature changes of high-temperature flue gas.

[0073] Preferably, the heat storage tank 220 is equipped with a detection sensor located inside the inner tank 206. The detection sensor is a K-type high-temperature wear-resistant thermocouple and an in-situ zirconia oxygen sensor, which are used to detect the temperature and dust of the flue gas inside the heat storage tank 220, respectively. This helps the operator to monitor the working status inside the heat storage tank 220 in real time. At the same time, it can control the operation of the drive component 216, adjust the alignment of different ventilation holes 214 on the middle layer brick 212 and the ventilation holes 214 on the upper and lower layers of bricks, thereby adjusting the overall size of the ventilation holes 214 of the heat storage tank 220 to adapt to the flue gas temperature and flow rate under different working conditions.

[0074] In actual use, a kiln for sodium silicate production according to an embodiment of this application is as follows:

[0075] During normal kiln production, sodium silicate melting reaction continuously occurs in the molten pool 101. The high-temperature flue gas generated by the reaction is introduced into one set of heat storage tanks 220 through the small furnace 104. This set of heat storage tanks 220 enters the heat storage state to complete the waste heat recovery of the flue gas. The other set of heat storage tanks 220 simultaneously enters the heat release preheating state, heating the cold air with the stored waste heat. The preheated high-temperature air is sent into the molten pool 101 through the corresponding small furnace 104 to provide high-temperature combustion air for fuel combustion and sodium silicate melting reaction in the molten pool 101. The two sets of heat storage tanks 220 periodically switch the flue and air supply passages, cyclically alternating to complete the heat storage and heat release operations. During the operation, the outer tank 2... The blower inside the top air inlet pipe 103 operates continuously, driving external cold air into the annular gap between the outer tank 201 and the inner tank 206. The cold air flows from top to bottom, preheating by absorbing the residual heat emitted from the inner tank 206 wall. Finally, it enters the inner tank 206 evenly through multiple air inlets 106 evenly distributed around the bottom of the inner tank 206, absorbing the heat stored in the checker bricks 205 inside the inner tank 206, and then enters the molten pool 101 through the small furnace 104. The high-temperature flue gas discharged from the molten pool 101 enters another heat storage tank 220, the inner tank 206, through the small furnace 104, flowing from top to bottom through the upper, middle, and lower checker bricks. Brick 205 completes multi-stage gradient heat exchange and storage. The three layers of checker bricks 205 adopt a differentiated pore size design to form a gradient heat exchange structure: the upper layer checker bricks 205 have the smallest ventilation holes 214, and the high-temperature flue gas first passes through the small-diameter ventilation holes 214 in the upper layer, and is divided into a fine airflow stream, which greatly increases the contact area between the flue gas and the checker bricks 205, achieving sufficient initial heat exchange, allowing the upper checker bricks 205 to quickly absorb and store high-temperature waste heat; the middle layer checker bricks 205 have moderately sized ventilation holes 214, which can avoid the flue gas velocity from decaying too quickly, continuously undertake heat exchange operations, and stably retain the heat of the flue gas; the lower layer checker bricks 205 have the largest ventilation holes 214, which can effectively To reduce the flow resistance of low-temperature flue gas, avoid poor flue gas exhaust and abnormal pressure rise inside the kiln, ensure smooth flue gas discharge, and simultaneously achieve end-of-pipe waste heat recovery, the upper and lower layer bricks 211 are positioned and fixed by the annular support platform 217 of the inner tank 206, maintaining a stationary state. Only the middle layer bricks 212 can rotate flexibly. When the kiln feed volume is large, the flue gas flow rate is high, and the residence time in the heat storage tank 220 is short, the drive component 216 starts the drive motor 202. Through the meshing of the gear 204 and the gear ring 213, the small-diameter ventilation holes 214 of the middle layer bricks 212 of the upper and middle layer checker bricks 205 are aligned with the ventilation holes 214 of the upper and lower layer bricks 211. By reducing the ventilation flow hole diameter, the flue gas heat exchange area is increased, the flue gas flow rate is slowed down, and the flue gas heat exchange residence time is extended, preventing high-temperature flue gas from being discharged directly without sufficient heat exchange, eliminating heat waste, and improving the waste heat recovery and utilization rate.When the kiln feed rate is small, the flue gas flow rate is low and the velocity is slow, problems such as excessive heat exchange of flue gas, excessively low exhaust gas temperature, and imbalance of heat storage in the two tanks are likely to occur. In this case, the middle layer brick 212 of the upper and middle layer checker bricks 205 is rotated to align the large-diameter ventilation holes 214 with the upper and lower layer ventilation holes 214, thereby expanding the ventilation flow cross section, accelerating the flue gas discharge speed, shortening the flue gas residence time, preventing excessive heat absorption by the checker bricks 205, balancing the heat storage temperature difference between the two sets of heat storage tanks 220, and maintaining a stable heat exchange efficiency.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A kiln for sodium silicate production, comprising a molten pool (101); Its features are, It also includes a heat storage component (200); The heat storage assembly (200) includes checker bricks (205), ball bearings (208), annular grooves (209), ventilation holes (214), drive assembly (216), and heat storage tank (220). The heat storage tank (220) is fixed on one side of the molten pool (101), and the heat storage tank (220) consists of an inner tank (206) and an outer tank (201); The inner tank (206) is fixed inside the outer tank (201), and a gap is left between the inner tank (206) and the outer tank (201); The inner tank (206) has multiple sets of grid bricks (205) fixed inside, and the inner tank (206) is connected to the molten pool (101); The grid bricks (205) consist of an upper layer bricks (210), a middle layer bricks (212) and a lower layer bricks (211); The annular groove (209) is opened on the upper side of the lower brick (211), the lower side of the upper brick (210), and the upper and lower sides of the middle brick (212). Multiple balls (208) are evenly embedded in the annular groove (209), and the balls (208) can roll along the annular groove (209). The ventilation holes (214) are opened inside the upper layer bricks (210), the middle layer bricks (212) and the lower layer bricks (211), and the ventilation holes (214) penetrate a single grid brick (205) in the vertical direction. The ventilation holes (214) on the upper brick (210) and the lower brick (211) have the same diameter and number. The ventilation holes (214) on the middle brick (212) are twice the number of ventilation holes on the upper brick (210). The middle brick (212) is provided with two kinds of staggered ventilation holes (214). The small diameter ventilation holes (214) are smaller than the diameter of the ventilation holes (214) on the upper brick (210), and the large diameter ventilation holes (214) are larger than the diameter of the ventilation holes (214) on the upper brick (210). The drive assembly (216) is installed at the top of the heat storage tank (220), and the output end of the drive assembly (216) is connected to the middle layer brick (212) for transmission.

2. The kiln for sodium silicate production as described in claim 1, characterized in that, The inner tank (206) is provided with three layers of grid bricks (205); The bottom of the inner tank (206) is fixed with a support brick (207), which supports the weight of the lower grid bricks (205); The annular support platform (217) provided on the inner wall of the inner tank (206) is positioned and installed. The annular support platform (217) is constructed of refractory bricks. The bottom edge of the lower brick (211) protrudes from the brick body and is embedded in the annular groove (209) on the annular support platform (217), and the top edge of the upper brick (210) protrudes from the brick body and is embedded in the annular groove (209) on the annular support platform (217).

3. The kiln for sodium silicate production as described in claim 1, characterized in that, An air blowing pipe (102) is fixed to the side wall of the inner tank (206); The air blowing pipe (102) extends out from the side wall of the outer tank (201) and can be connected to an external compressed air source to introduce high-pressure pulse airflow into the inner tank (206).

4. The kiln for sodium silicate production as described in claim 1, characterized in that, The ventilation holes (214) opened on the grid bricks (205) have different diameters. The uppermost grid brick (205) has the smallest diameter, the middle grid brick (205) has the next smallest diameter, and the lowermost grid brick (205) has the largest diameter. The ventilation holes (214) on the middle layer brick (212) are chamfered at both ends, so that the connected ventilation holes (214) form a funnel-shaped airflow channel that is small in the middle and large at both ends.

5. The kiln for sodium silicate production as described in claim 1, characterized in that, The drive assembly (216) includes a drive motor (202), a gear ring (213), a transmission shaft (203), and a gear (204). The drive shaft (203) is fixed on the rotating shaft of the drive motor (202), and the gear (204) is fixed on the drive shaft (203); The inner tank (206) has an opening on its side wall for gear (204) and gear ring (213) to mesh. The gear ring (213) is fixed to the side wall of the middle brick (212) and meshes with the gear (204) for transmission.

6. The kiln for sodium silicate production as described in claim 5, characterized in that, The drive assembly (216) is provided in three groups, which respectively control the rotation of the middle bricks (212) on the upper grid bricks (205), the middle grid bricks (205) and the lower grid bricks (205).

7. The kiln for sodium silicate production as described in claim 5, characterized in that, The inner tank (206) has an opening on its side wall with a sealing ring (215). The sealing ring (215) is made of high-temperature resistant heat insulation material.

8. The kiln for sodium silicate production as described in claim 1, characterized in that, An air inlet pipe (103) is fixed on the top side wall of the outer tank (201). The air intake pipe (103) is equipped with a blower, which drives air into the gap between the outer tank (201) and the inner tank (206); The inner tank (206) has an air inlet (106) at the bottom of its side wall. There are multiple air inlets (106), which are distributed around the bottom of the inner tank (206).

9. The kiln for sodium silicate production as described in claim 1, characterized in that, The heat storage tank (220) is fixed on the base (105); The heat storage tank (220) has a discharge port at the bottom.

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