A lime kiln for lime preparation with uniform cross-sectional airflow distribution.

Abstract

This invention relates to the field of lime kiln technology and discloses a structure for uniform air distribution in the cross-section of a lime kiln used for lime preparation. The structure includes a lime kiln and a blower for supplying air to the kiln. An air chamber is located on the outside of the lime kiln, and a duct is connected between the blower's outlet and the air chamber. Peripheral air vents and through-flow air vents are located on the side of the lime kiln. Multiple arc-shaped grooves are formed on the outer wall of the lime kiln, adjacent to the peripheral air vents and through-flow air vents. Sealing blocks are slidably installed within the arc-shaped grooves, and these sealing blocks are interconnected. A low-pressure chamber is located near one of the through-flow air vents. The peripheral air vents and through-flow air vents open and close alternately. When the peripheral air vents are open, air diffuses along the kiln wall. When the through-flow air vents are open, air passes directionally through the central area and is blown into the low-pressure chamber through another through-flow air vent. This alternating circumferential diffusion and central directional through-flow air supply pattern achieves a uniform distribution of fresh air within the lime kiln.

Description

Technical Field

[0001] This invention relates to the field of lime kiln technology, and more specifically, to a structure for a lime kiln used in lime preparation with uniform cross-sectional airflow distribution. Background Technology

[0002] In lime kiln processes, the uniformity of the cross-sectional air intake plays a crucial role in overall production efficiency. When the air intake of the kiln cross-section is uniform, the fuel inside the kiln can achieve more complete and balanced combustion, avoiding temperature field imbalance caused by excessive or insufficient local air intake. This directly ensures the consistency of calcium carbonate decomposition reaction. If the air intake is uneven, it is easy for the material to be underburned (incomplete decomposition) or overburned (excessive crystal sintering), affecting the activity and purity of lime. Uniform air intake can also optimize the airflow distribution inside the kiln, making heat transfer more uniform, reducing local erosion of the kiln wall in the high-temperature zone, extending the service life of refractory materials, and reducing equipment maintenance costs.

[0003] In existing technologies, lime kilns are limited by the "kiln wall effect." During the calcination process, existing vertical lime kilns have continuously optimized and improved the distribution of combustion air in the calcination cross section to ensure the uniformity, high activity, and low underburning of lime products. Various improvement methods have been adopted, but the effects are not obvious. Therefore, they do not meet the current requirements. In response, we propose a lime kiln cross section with uniform air volume distribution for lime preparation. Summary of the Invention

[0004] This invention provides a uniform airflow distribution structure for a lime kiln used in lime preparation. This structure can alternate between circumferential diffusion and central directional through-draft air supply modes, achieving a uniform distribution of fresh air within the lime kiln. This solves the problem mentioned in the background art, where existing lime kilns are limited by the "kiln wall effect." In the calcination process, existing vertical lime kilns have continuously optimized and improved the distribution of combustion air across the calcination section to ensure the uniformity, high activity, and low underburning of lime products. Various improvement methods have been adopted, but the effects have not been significant.

[0005] To achieve the above objectives, this disclosure provides a structure for uniform air volume distribution in the cross section of a lime kiln for lime preparation, including a lime kiln and a fan for supplementing air to the lime kiln. An air chamber is provided on the outside of the lime kiln, and a No. 1 air duct is connected between the air outlet of the fan and the air chamber. A pair of surrounding air holes and a passage air hole are provided on the side of the lime kiln. The surrounding air holes and the passage air holes are located inside the air chamber.

[0006] The outer wall of the lime kiln is provided with multiple arc-shaped grooves, which are respectively located near the surrounding air vents and the through air vents. A sealing block is slidably installed in the arc-shaped groove, and the multiple sealing blocks are connected by transmission. A low-pressure chamber is provided near one of the through air vents. The surrounding air vents and the through air vent open and close alternately.

[0007] Optionally, the arc-shaped groove has a through hole on the side near the lime kiln, and the through holes on the multiple arc-shaped grooves are respectively arranged to correspond to the surrounding air holes and the passage air holes. The sealing block has a through groove, and a connecting rod is connected between two adjacent sealing blocks. The connecting rod is set as an arc-shaped rod, and a return spring is arranged in the through groove. The return spring is sleeved on the connecting rod, and the other end of the return spring is connected to the sealing block.

[0008] Optionally, a cylinder is provided at the top of the air chamber, a wedge-shaped block is provided on the telescopic rod of the cylinder, a push rod is installed on the connecting rod, and the wedge-shaped block abuts against the push rod.

[0009] Optionally, a movable plate is slidably disposed in the low-pressure chamber, the movable plate is connected to the sealing block, a preheating pipe is disposed at one end of the low-pressure chamber near the through groove, and a one-way valve is installed at the other end of the preheating pipe.

[0010] Optionally, the preheating tubes are provided in pairs, and the pair of preheating tubes are configured as S-shaped tubes, and the preheating tubes are distributed in an arc shape in the air chamber.

[0011] Optionally, the sealing block has a groove on the side near the lime kiln, a movable block for sealing the through hole is movably disposed in the groove, and a compression spring is disposed in the groove, with the other end of the compression spring connected to the movable block.

[0012] Optionally, a control valve is installed on the air chamber, and a second air duct is connected between the control valve and the air chamber. An air outlet is opened on the side of the control valve, a sealing plate is movably installed inside the control valve, and a tension spring is installed inside the control valve. The other end of the tension spring is connected to the sealing plate.

[0013] Optionally, a temperature monitoring chamber is provided on the side of the preheating pipe, a temperature feedback pipe is provided on the temperature monitoring chamber, and a piston plate is slidably arranged in the temperature feedback pipe.

[0014] Optionally, the control valve is provided with a slide groove, a movable column is movably disposed in the slide groove, a connecting plate is installed at one end of the movable column near the sealing plate, and the tension spring is installed on the connecting plate;

[0015] A vertical rod is installed on the top of the piston plate, and the other end of the vertical rod is slidably inserted into the control valve. An abutment block is provided at the top of the vertical rod, and the abutment block abuts against the connecting plate.

[0016] Optionally, a ceramic heat-conducting layer is provided around the preheating pipe, and the ceramic heat-conducting layer is attached to the outer wall of the temperature monitoring room.

[0017] Through the above technical solution, the uniform air volume distribution structure of the lime kiln cross section provided in this disclosure, when in use: if the surrounding air holes are open and the through air holes are closed, the air in the air chamber enters the lime kiln through the surrounding air holes and diffuses along the kiln wall. Conversely, when the through air holes are open and the surrounding air holes are closed, the moving plate that moves with the sealing block in the low-pressure chamber forms a low-pressure zone (the pressure is lower than that of the lime kiln) behind it, forcing the air to enter the kiln body from one through air hole, directionally pass through the central area, and then blow into the low-pressure chamber from another through air hole. The alternating circumferential diffusion and central directional through air supply mode realizes the uniform distribution of fresh air in the lime kiln, ensuring the uniformity, high activity, and low underburning of the lime product quality.

[0018] In addition, when the temperature inside the lime kiln drops, the pressure inside the air chamber increases, thereby maintaining a high air supply intensity. Conversely, when the kiln temperature rises, the pressure inside the air chamber decreases, causing the air supply to automatically weaken. Through the displacement amplification effect of the temperature feedback tube and the linkage adjustment of the tension spring, the air supply force of the air chamber is dynamically matched with the temperature inside the lime kiln.

[0019] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the internal structure of the air chamber of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure where the surrounding air vents of the present invention are open.

[0024] Figure 4 This is a schematic diagram of the structure for opening the ventilation hole in the main structure of the present invention.

[0025] Figure 5 This is a schematic diagram of the installation structure of the sealing block of the present invention.

[0026] Figure 6This is a schematic diagram of the wedge block and push rod of the present invention.

[0027] Figure 7 Appendix to this invention Figure 3 A magnified structural diagram of point A in the middle.

[0028] Figure 8 This is a schematic diagram of the installation structure of the preheating pipe of the present invention.

[0029] Figure 9 This is a schematic diagram of the structure of the ceramic thermal conductive layer of the present invention.

[0030] Figure 10 This is a cross-sectional structural diagram of the control valve of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 101, lime kiln; 102, surrounding air vent; 103, through air vent; 201, air chamber; 202, fan; 203, No. 1 air duct; 204, cylinder; 205, low-pressure chamber; 206, arc-shaped groove; 207, through hole; 208, movable block; 209, sealing block; 210, through groove; 211, connecting rod; 212, push rod; 213, groove; 215, compression spring; 216, return spring; 217. Moving plate; 218. Wedge block; 301. Control valve; 302. No. 2 air duct; 303. Temperature monitoring chamber; 304. Temperature feedback pipe; 305. Air outlet; 306. Preheating pipe; 307. One-way valve; 308. Ceramic heat-conducting layer; 309. Piston plate; 310. Vertical rod; 311. Contact block; 312. Sealing plate; 313. Connecting plate; 314. Tension spring; 315. Moving column; 316. Slide groove. Detailed Implementation

[0032] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this disclosure. However, this disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific embodiments disclosed below.

[0033] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. The terms "first" and "second" are used to distinguish one element from another and do not have sequential or importance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same or similar elements, which will not be repeated here.

[0034] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0035] According to some embodiments of this disclosure, a structure for uniform airflow distribution in the cross-section of a lime kiln for lime preparation is provided, with reference to... Figures 1 to 10 As shown, the lime kiln for lime preparation with uniform cross-sectional airflow distribution includes a lime kiln 101 and a blower 202 for supplying air to the lime kiln 101. An air chamber 201 is provided on the outside of the lime kiln 101. A duct 203 is connected between the air outlet of the blower 202 and the air chamber 201. A pair of peripheral air vents 102 and a passage air vent 103 are provided on the side of the lime kiln 101. Figure 2 A pair of surrounding air vents 102 and a pair of through air vents 103 are respectively arranged opposite to each other. The surrounding air vents 102 and through air vents 103 are located inside the air chamber 201. Multiple arc-shaped grooves 206 are provided on the outer wall of the lime kiln 101. The multiple arc-shaped grooves 206 are respectively arranged near the surrounding air vents 102 and through air vents 103. A sealing block 209 is slidably installed in the arc-shaped groove 206. The multiple sealing blocks 209 are connected by transmission. A low-pressure chamber 205 is provided near one of the through air vents 103. The surrounding air vents 102 and through air vents 103 open and close alternately.

[0036] Thus, fan 202 continuously supplies fresh air into air chamber 201 through duct 203. Figure 2 When the surrounding air vent 102 is opened, the through air vent 103 is closed. Air in the air chamber 201 enters the lime kiln 101 through the surrounding air vent 102. The air entering through the surrounding air vent 102 diffuses around the inner wall of the lime kiln 101. (Refer to...) Figure 3 When the surrounding air vents 102 are closed, the through air vents 103 are opened. Fresh air in the air chamber 201 enters the lime kiln 101 through one of the through air vents 103. With the low-pressure chamber 205 in place, the air is blown out through the other through air vent 103, thereby achieving the directional movement of fresh air in the lime kiln 101 and thus achieving the purpose of blowing fresh air to the center of the lime kiln 101. When this structure is in operation, the surrounding air vents 102 and the through air vents 103 open and close alternately, respectively supplementing air to the perimeter of the inner wall of the lime kiln 101 and the center of the lime kiln 101, so that the fresh air supplemented to the lime kiln 101 is evenly distributed in the lime kiln 101.

[0037] For details, please refer to Figure 2 , Figure 3 The arc-shaped groove 206 has a through hole 207 on the side near the lime kiln 101. The through holes 207 on the multiple arc-shaped grooves 206 are respectively set to correspond to the surrounding air holes 102 and the through air holes 103. The sealing block 209 has a through groove 210. A connecting rod 211 is connected between two adjacent sealing blocks 209. The connecting rod 211 is set as an arc rod. A return spring 216 is set in the through groove 210. The return spring 216 is sleeved on the connecting rod 211, and the other end of the return spring 216 is connected to the sealing block 209. Specifically, as the sealing block 209 moves, when the through groove 210 on the sealing block 209 is connected to the through hole 207, the surrounding air hole 102 or the through air hole 103 is in the open state. Conversely, when the through groove 210 on the sealing block 209 is not connected to the through hole 207, the surrounding air hole 102 or the through air hole 103 is in the closed state.

[0038] Additionally, please refer to Figure 6 A cylinder 204 is installed at the top of the air chamber 201. A wedge block 218 is installed on the telescopic rod of the cylinder 204, and a push rod 212 is installed on the connecting rod 211. The wedge block 218 abuts against the push rod 212. Therefore, the cylinder 204 is periodically opened. The telescopic rod of the cylinder 204 drives the wedge block 218 to move downward. Under the abutment of the wedge block 218, the push rod 212 drives the connecting rod 211 and the sealing block 209 to move. At the same time, the return spring 216 is compressed. After the telescopic rod of the cylinder 204 is reset, the push rod 212, the connecting rod 211, and the sealing block 209 are reset under the action of the return spring 216.

[0039] Please also refer to... Figure 8A movable plate 217 is slidably installed in the low-pressure chamber 205. The movable plate 217 is connected to the sealing block 209. A preheating pipe 306 is installed at one end of the low-pressure chamber 205 near the through slot 210. A one-way valve 307 is installed at the other end of the preheating pipe 306. Gas can only flow through the one-way valve 307 from the preheating pipe 306 to the air chamber 201. When the movable plate 217 moves with the sealing block 209, a low-pressure zone is generated behind the movable plate 217 due to the increase in space. The pressure in the low-pressure zone is less than the pressure in the lime kiln 101, which causes the air in the lime kiln 101 to be blown into the low-pressure chamber 205 in a directional manner. After the movable plate 217 is reset, the hot steam in the low-pressure chamber 205 is squeezed into the preheating pipe 306 and discharged by the one-way valve 307.

[0040] Specifically, a pair of preheating pipes 306 are provided, and the pair of preheating pipes 306 are set as S-shaped pipes. The S-shaped pipes help to increase the contact area between the pipe wall of the preheating pipe 306 and the air. The preheating pipes 306 are distributed in an arc shape in the air chamber 201. Therefore, after the hot air in the low-pressure chamber 205 is squeezed into the preheating pipes 306, the air in the air chamber 201 is preheated through the preheating pipes 306, so that the air is heated to a certain temperature before entering the lime kiln 101, thereby achieving the effect of saving energy.

[0041] In addition, since lime kiln 101 generates a certain amount of smoke and dust during operation, please refer to... Figure 2 , Figure 7 The sealing block 209 has a groove 213 on the side near the lime kiln 101. A movable block 208 for sealing the through hole 207 is movably arranged in the groove 213. A compression spring 215 is arranged in the groove 213. The other end of the compression spring 215 is connected to the movable block 208. The movable block 208 can periodically seal the through hole 207 to prevent the through hole 207 from accumulating ash and becoming blocked.

[0042] Through the above technical solution, the lime kiln cross-section with uniform air volume distribution structure for lime preparation provided in this disclosure, when in use, the blower 202 continuously supplies air to the air chamber 201 through the first air duct 203, and the cylinder 204 periodically drives the telescopic rod to push the wedge block 218 down. The wedge block 218 abuts against the push rod 212 and pushes the connecting rod 211, causing multiple sealing blocks 209 to slide synchronously in the arc groove 206 and compress the return spring 216. When the sealing block 209 slides to the point where the through groove 210 connects with the through hole 207, if the through hole 207 corresponds to the surrounding air hole 102, then the surrounding air hole 102... When the air passage 103 is closed, the air in the air chamber 201 enters the lime kiln 101 through the surrounding air passage 102 and diffuses along the kiln wall. Conversely, when the through groove 210 is connected to the through hole 207 corresponding to the air passage 103, the air passage 103 is opened and the surrounding air passage 102 is closed. At this time, the moving plate 217 that moves with the sealing block 209 in the low-pressure chamber 205 forms a low-pressure area (the pressure is lower than that of the lime kiln 101) behind it, forcing the air to enter the kiln body from one air passage 103, pass through the central area in a directional manner, and then be blown into the low-pressure chamber 205 from another air passage 103.

[0043] When the movable plate 217 is reset, it compresses the hot air collected in the low-pressure chamber 205 through the S-shaped preheating pipe 306 and discharges it into the air chamber 201 through the one-way valve 307. The preheating of fresh air achieves energy-saving effect. During this process, the movable block 208 vibrates periodically under the action of the compression spring 215 to prevent the through hole 207 at the groove 213 from accumulating ash and becoming blocked. Finally, the alternating circumferential diffusion and central directional through-hall air supply mode, combined with waste heat recovery, achieves uniform distribution and efficient utilization of fresh air in the lime kiln 101.

[0044] It should be noted that the one-way valve 307 includes a pipe and a baffle hinged in the pipe. The baffle can rotate in one direction under the cooperation of a spring, thereby realizing the one-way passage of gas. The specific structure and principle of the one-way valve 307 are well known to those skilled in the art and will not be described in detail here. In addition, in the prior art, the lime kiln 101 is equipped with a valve for stabilizing the pressure inside the kiln (not shown in the figure). Under the action of this valve, the gas pressure inside the lime kiln 101 is constant. This valve is prior art and will not be described in detail here either.

[0045] In some embodiments of this disclosure, reference is made to Figure 8 , Figure 9 , Figure 10As shown, a control valve 301 is installed on the air chamber 201. A second air duct 302 is connected between the control valve 301 and the air chamber 201. An air outlet 305 is opened on the side of the control valve 301. A sealing plate 312 is movably installed inside the control valve 301. The second air duct 302 is intermittently connected to the air outlet 305. A tension spring 314 is installed inside the control valve 301. The other end of the tension spring 314 is connected to the sealing plate 312. Therefore, if the pressure inside the air chamber 201 is too high, the gas in the air chamber 201 enters the control valve 301 through the second air duct 302. At this time, the gas pushes the sealing plate 312 in the control valve 301, so that the second air duct 302 is connected to the air outlet 305.

[0046] In addition, a temperature monitoring chamber 303 is provided on the side of the preheating pipe 306, and a temperature feedback pipe 304 is provided on the temperature monitoring chamber 303. A piston plate 309 is slidably arranged in the temperature feedback pipe 304. Therefore, as the internal temperature of the temperature monitoring chamber 303 changes, the gas inside the temperature monitoring chamber 303 expands and contracts to different degrees, causing the piston plate 309 to move up and down. Specifically, when the internal temperature of the temperature monitoring chamber 303 decreases, the volume of the gas in the temperature monitoring chamber 303 decreases, and the piston plate 309 moves down. Conversely, when the internal temperature of the temperature monitoring chamber 303 increases, the volume of the gas in the temperature monitoring chamber 303 expands and increases, and the piston plate 309 moves up. Since the temperature monitoring chamber 303 comes from inside the lime kiln 101, the piston plate 309 reflects the internal temperature of the piston plate 309. Moreover, the piston plate 309 is located in the temperature feedback pipe 304. Therefore, even if the gas in the temperature monitoring chamber 303 undergoes a small volume change, the piston plate 309 in the temperature feedback pipe 304 will have a large displacement.

[0047] For details, please refer to Figure 10 The control valve 301 is provided with a slide groove 316, and a movable column 315 is movably arranged in the slide groove 316. A connecting plate 313 is installed at one end of the movable column 315 near the sealing plate 312. A tension spring 314 is installed on the connecting plate 313. A vertical rod 310 is installed on the top of the piston plate 309. The other end of the vertical rod 310 is slidably inserted into the control valve 301. An abutment block 311 is provided at the top of the vertical rod 310. The abutment block 311 abuts against the connecting plate 313.

[0048] It should be noted that if the internal temperature of the lime kiln 101 drops, the piston plate 309 in the temperature feedback pipe 304 will move downward accordingly. At this time, the piston plate 309 drives the vertical rod 310 and the contact block 311 to move downward. At this time, the contact block 311 abuts against the connecting plate 313, and the connecting plate 313, the moving column 315, the tension spring 314, and the sealing plate 312 move to the left. Therefore, in order to connect the second air duct 302 with the air outlet 305, the sealing plate 312 needs to have a greater rightward displacement. Meanwhile, the tension spring 314 needs to generate a larger amount of tension. Therefore, after the gas in the air chamber 201 enters the control valve 301 through the second air duct 302, the greater pressure pushes the sealing plate 312 to the right so that the second air duct 302 can connect with the air outlet 305. Therefore, when the internal temperature of the lime kiln 101 decreases, the pressure in the air chamber 201 will increase accordingly. After the pressure in the air chamber 201 increases, the airflow from the air chamber 201 into the lime kiln 101 increases.

[0049] Conversely, if the internal temperature of the lime kiln 101 rises, the sealing plate 312 moves to the right. Therefore, to connect the second air duct 302 with the air outlet 305, the sealing plate 312 only needs a small rightward displacement, and the tension spring 314 needs a smaller amount of tension. Thus, after the gas in the air chamber 201 enters the control valve 301 through the second air duct 302, the smaller pressure pushes the sealing plate 312 to the right, which can connect the second air duct 302 with the air outlet 305. Therefore, when the internal temperature of the lime kiln 101 rises, the pressure in the air chamber 201 will decrease accordingly. After the pressure in the air chamber 201 decreases, the airflow into the lime kiln 101 decreases, thereby achieving dynamic adjustment of the airflow according to the temperature inside the lime kiln 101.

[0050] In addition, a ceramic heat-conducting layer 308 is provided around the preheating pipe 306. The ceramic heat-conducting layer 308 is attached to the outer wall of the temperature monitoring chamber 303. The ceramic heat-conducting layer 308 tightly wraps the preheating pipe 306 and transfers heat to the temperature monitoring chamber 303, making the temperature feedback inside the temperature monitoring chamber 303 more sensitive.

[0051] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0053] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A lime kiln for lime preparation with uniform cross-sectional airflow distribution, comprising a lime kiln (101) and a blower (202) for supplying air to the lime kiln (101), characterized in that: An air chamber (201) is provided on the outside of the lime kiln (101). A duct (203) is connected between the air outlet of the blower (202) and the air chamber (201). A surrounding air hole (102) and a through air hole (103) are provided on the side of the lime kiln (101). A pair of surrounding air holes (102) and through air holes (103) are provided respectively. The surrounding air holes (102) and the through air holes (103) are located inside the air chamber (201). The outer wall of the lime kiln (101) is provided with a plurality of arc-shaped grooves (206). The plurality of arc-shaped grooves (206) are respectively located near the surrounding air vents (102) and the through air vents (103). A sealing block (209) is slidably installed in the arc-shaped groove (206). The plurality of sealing blocks (209) are connected by transmission. A low-pressure chamber (205) is provided near one of the through air vents (103). The surrounding air vents (102) and the through air vents (103) open and close alternately.

2. The uniform airflow distribution structure of a lime kiln for lime preparation according to claim 1, characterized in that: The arc-shaped groove (206) has a through hole (207) on the side near the lime kiln (101). The through holes (207) on the multiple arc-shaped grooves (206) are respectively set to correspond to the surrounding air holes (102) and the passage air holes (103). The sealing block (209) has a through groove (210). A connecting rod (211) is connected between two adjacent sealing blocks (209). The connecting rod (211) is set as an arc-shaped rod. A return spring (216) is set in the through groove (210). The return spring (216) is sleeved on the connecting rod (211), and the other end of the return spring (216) is connected to the sealing block (209).

3. The uniform airflow distribution structure of a lime kiln for lime preparation according to claim 2, characterized in that: A cylinder (204) is provided on the top of the air chamber (201). A wedge block (218) is provided on the telescopic rod of the cylinder (204). A push rod (212) is installed on the connecting rod (211). The wedge block (218) abuts against the push rod (212).

4. The structure for uniform airflow distribution in the cross-section of a lime kiln for lime preparation according to claim 3, characterized in that: A movable plate (217) is slidably disposed in the low-pressure chamber (205). The movable plate (217) is connected to the sealing block (209). A preheating pipe (306) is disposed at one end of the low-pressure chamber (205) near the through groove (210). A one-way valve (307) is installed at the other end of the preheating pipe (306).

5. The uniform airflow distribution structure of a lime kiln for lime preparation according to claim 4, characterized in that: The preheating tubes (306) are provided in pairs, and the pair of preheating tubes (306) are configured as S-shaped tubes, and the preheating tubes (306) are distributed in an arc shape in the air chamber (201).

6. The uniform airflow distribution structure of a lime kiln for lime preparation according to claim 5, characterized in that: The sealing block (209) has a groove (213) on the side near the lime kiln (101). A movable block (208) for sealing the through hole (207) is movably disposed in the groove (213). A compression spring (215) is disposed in the groove (213), and the other end of the compression spring (215) is connected to the movable block (208).

7. The uniform airflow distribution structure of a lime kiln for lime preparation according to claim 4, characterized in that: A control valve (301) is installed on the air chamber (201). A second air duct (302) is connected between the control valve (301) and the air chamber (201). An air outlet (305) is opened on the side of the control valve (301). A sealing plate (312) is movably installed inside the control valve (301). A tension spring (314) is installed inside the control valve (301). The other end of the tension spring (314) is connected to the sealing plate (312).

8. The uniform airflow distribution structure of a lime kiln for lime preparation according to claim 7, characterized in that: A temperature monitoring chamber (303) is provided on the side of the preheating pipe (306), and a temperature feedback pipe (304) is provided on the temperature monitoring chamber (303). A piston plate (309) is slidably provided in the temperature feedback pipe (304).

9. The structure for uniform airflow distribution in the cross-section of a lime kiln for lime preparation according to claim 8, characterized in that: The control valve (301) is provided with a slide groove (316), and a movable column (315) is movably arranged in the slide groove (316). A connecting plate (313) is installed on one end of the movable column (315) near the sealing plate (312), and the tension spring (314) is installed on the connecting plate (313). A vertical rod (310) is installed on the top of the piston plate (309). The other end of the vertical rod (310) is slidably inserted into the control valve (301). An abutment block (311) is provided at the top of the vertical rod (310). The abutment block (311) abuts against the connecting plate (313).

10. A uniform airflow distribution structure for a lime kiln in lime preparation according to claim 9, characterized in that: A ceramic heat-conducting layer (308) is provided around the preheating pipe (306), and the ceramic heat-conducting layer (308) is attached to the outer wall of the temperature monitoring chamber (303).

Images