Vertical continuous lime kiln

Abstract

The present invention discloses a vertical continuous calcining lime kiln. The interior of the kiln is divided into a preheating zone, a calcining zone, and a cooling zone from top to bottom. N combustion chambers made of high-temperature resistant material are provided in the calcining zone, each with an open bottom end. Each combustion chamber is provided with a burner connected to the exterior of the kiln. The burner is provided with a fuel interface pipe connected to a fuel supply pipeline and an air interface pipe for supplying air to the combustion chamber. A kiln waste heat pipe is provided in the cooling zone, which supplies hot air and oxygen to each combustion chamber via a waste heat blower. A kiln flue gas pipe is provided in the preheating zone, connected to the exterior of the kiln. The outer end of the kiln flue gas pipe is connected to a chimney. The kiln has high thermal efficiency, is energy-saving and environmentally friendly, achieves uniform calcination, and produces high-quality products, enabling continuous production.

Description

Technical Field

[0001] The invention relates to the technical field of lime kilns, in particular to a vertical continuous calcining lime kiln. Background Art

[0002] Traditional lime production uses intermittent lime kilns with low production efficiency. The fuel is mainly coal, and a coal-stone mixed combustion method is adopted. Due to the poor control of coal quality and coal-stone ratio, it is impossible to guarantee that there will be no overburning and raw burning. The product quality is unstable, the authenticity rate is very low, and the energy consumption is high. The flue gas emissions do not meet environmental protection requirements.

[0003] In modern technology, continuous production lime kilns mainly include rotary kilns and vertical kilns. Rotary kilns require high investment, long construction period, and high cost, while vertical kilns have the characteristics of low investment and low construction cost. Therefore, vertical kilns are currently more widely used.

[0004] Chinese patent CN201165494Y discloses a vertical continuous calcining lime kiln. It comprises a cylindrical kiln body, which is equipped with, from top to bottom, a closed-air feed device, a distribution device, a preheating zone, a calcining zone, a cooling zone, and a continuous discharge device. The kiln's interior is provided with a hot air outlet duct extending axially along the kiln body to the preheating zone, with several air inlets and outlets located on its walls. An annular combustion chamber is mounted on the outer circumference of the kiln body in the calcining zone, with flame nozzles connected to the calcining zone. However, the kiln's disadvantages are that the annular combustion chamber, located on the outer circumference of the kiln body, cannot fully utilize the heat radiated from the combustion chamber. The axially arranged air outlet duct directly removes the heat, resulting in low thermal efficiency and smoke emissions that do not meet environmental standards. Summary of the Invention

[0005] The purpose of the present invention is to provide a vertical continuous calcining lime kiln to address the problems existing in the above-mentioned prior art, which has high thermal efficiency, energy saving and environmental protection, uniform calcination, good product quality and can realize continuous production.

[0006] The technical scheme adopted in the present application is: a vertical continuous lime calcining kiln, comprising a frame and a kiln body supported by the frame, the kiln body comprising a shell and a heat-insulating refractory layer arranged on the inner wall of the shell, the interior of the kiln body comprising, from top to bottom, a preheating zone, a calcining zone and a cooling zone; a closed feeding device is arranged at the top of the kiln body, and a continuous discharging device is arranged at the lower part of the kiln body; N combustion chambers made of high-temperature-resistant material and having an open lower end are arranged in the calcining zone, each combustion chamber is provided with a combustion port connected to the outside of the kiln body, a burner is arranged on the combustion port, and a fuel interface pipe connected to a fuel supply pipe and an air supply interface pipe for supplying air to the combustion chamber are arranged on the burner; a kiln internal waste heat pipe connected to the outside of the kiln body is arranged in the cooling zone, the kiln internal waste heat pipe is connected to an air inlet of a waste heat fan, and an air outlet of the waste heat fan is connected to each air supply interface pipe through a kiln external waste heat pipe to provide hot air and oxygen to each combustion chamber; a kiln internal flue gas pipe connected to the outside of the kiln body is arranged in the preheating zone, and the outer end of the kiln internal flue gas pipe is connected to a chimney.

[0007] Preferably, the kiln internal waste heat pipes are multiple, the multiple kiln internal waste heat pipes are uniformly arranged in the cooling zone, and a plurality of uniformly distributed air inlet holes are arranged on the lower side of each kiln internal waste heat pipe; the outer ends of the multiple kiln internal waste heat pipes are connected to the air inlet of a cyclone dust collector, and the air outlet of the cyclone dust collector is connected to the air inlet of the waste heat fan. The preferred scheme has the beneficial effect of facilitating uniform cooling of the ore and full absorption of waste heat, and having a dust removal function.

[0008] Preferably, each kiln internal waste heat pipe is provided with a reverse U-shaped high-temperature-resistant protective cover. The preferred scheme has the beneficial effect of protecting the kiln internal waste heat pipe, and the reverse U-shaped high-temperature-resistant protective cover has an opening on the lower side to avoid ore accumulation on the lower side of the kiln internal waste heat pipe to block the air inlet holes and affect the waste heat absorption effect.

[0009] Preferably, the kiln internal flue gas pipes are multiple, the multiple kiln internal flue gas pipes are uniformly arranged in the preheating zone, a plurality of uniformly distributed flue gas outlet holes are arranged on the lower side of each kiln internal flue gas pipe, and the outer ends of the multiple kiln internal flue gas pipes are connected to the chimney. The preferred scheme has the beneficial effect that the flue gas rising in the calcining zone can be uniformly distributed to each part of the preheating zone, facilitating uniform preheating of the ore.

[0010] Preferably, the chimney comprises a descending chimney and an ascending chimney installed on the ground, the outer ends of the multiple kiln internal flue gas pipes are connected to the upper end of the descending chimney, and a smoke dust fan or dust removal equipment is arranged between the descending chimney and the ascending chimney. The preferred scheme has the beneficial effect that the smoke dust fan or dust removal equipment can be arranged on the ground, facilitating installation and maintenance.

[0011] Preferably, the shell is a square tube-shaped metal shell, and a heat-insulating refractory layer is arranged on the inner side of the metal shell, the heat-insulating refractory layer comprising an outer heat-insulating layer and an inner refractory layer; the front metal shell and the front heat-insulating refractory layer form a front kiln wall, the rear metal shell and the rear heat-insulating refractory layer form a rear kiln wall, the left metal shell and the left heat-insulating refractory layer form a left kiln wall, and the right metal shell and the right heat-insulating refractory layer form a right kiln wall; a plurality of high-temperature-resistant partitions are vertically connected between the left refractory layer and the right refractory layer in the calcination zone, and the refractory layer, the high-temperature-resistant partitions and a high-temperature-resistant top sealing plate form the N combustion chambers with open lower ends, and N-1 calcination chambers with open upper and lower ends are arranged between adjacent combustion chambers, and the combustion ports are arranged on the left kiln wall or the right kiln wall corresponding to each combustion chamber. The preferred scheme has the beneficial effects of reasonable structure, easy material selection, installation and production, and favorable energy-saving and heat-insulating effects of the kiln body and long service life.

[0012] Preferably, the high-temperature-resistant partitions, the high-temperature-resistant top sealing plate and the inverted U-shaped high-temperature-resistant protective cover are made of silicon carbide plates. The preferred scheme has the beneficial effects of full use of the advantages of silicon carbide plates, such as high hardness, high-temperature resistance and good thermal conductivity, small occupied space, long service life and heat conduction of the heat of the combustion chamber to the ore in the calcination chamber.

[0013] Preferably, the burner comprises a cylinder with a closed outer end and an open inner end, a flange is arranged on the inner end of the cylinder, a wind supply interface pipe is connected to the lower side of the cylinder, and a fuel interface pipe, an igniter interface and a temperature measuring interface are arranged on the closed end of the cylinder. The preferred scheme has the beneficial effects of installation of the burner on the combustion port through the flange, convenient connection of the fuel supply pipe, the kiln outer waste heat pipe, the igniter and the temperature measuring sensor.

[0014] Preferably, a sinking groove is arranged on the closed end of the cylinder, and the igniter interface and the temperature measuring interface are arranged on the outer end face of the sinking groove. The preferred scheme has the beneficial effects of protection of the installation of the igniter and the temperature measuring sensor.

[0015] Preferably, the continuous discharging device comprises, from top to bottom in sequence, a kiln grate, a material supporting plate and a discharging hopper in the lower part of the cooling zone; the kiln grate is a plurality of ridge-shaped kiln grates arranged in the front and back direction with intervals, the interval between the ridge-shaped kiln grates is a material falling gap between the grates, a material supporting plate parallel to the material falling gap between the grates is arranged directly below the material falling gap between the grates, a certain vertical spacing is left between the material falling gap between the grates and the material supporting plate, the width of the material supporting plate is greater than that of the material falling gap between the grates, the interval between the material supporting plates is a material falling gap between the material supporting plates; a pushing plate is arranged on the top of each material supporting plate, each pushing plate is connected together by 2-3 connecting rods to form a pushing assembly, the pushing assembly is driven by a pushing power mechanism to reciprocate in the front and back direction, and the pushing plate continuously pushes the baked stone into the discharging hopper. The preferred scheme has the beneficial effects that the discharging speed can be controlled according to the process requirements, the falling speed of the ore in the kiln body and the calcination time are thus controlled, continuous production can be realized, the product quality is ensured, in addition, it has simple structure, low cost and low operation cost, and can meet the process requirements.

[0016] Preferably, the air closing feeding device comprises a square tube-shaped feeding hopper, and upper and lower gates are arranged at the upper and lower parts of the square tube-shaped feeding hopper respectively and are driven to open and close by a gate power mechanism. The preferred scheme has the beneficial effects that the quantity of the loaded material is controllable, and the square tube-shaped feeding hopper can be ensured to be in a closed state at all times.

[0017] Preferably, the pushing power mechanism adopts a pushing oil cylinder for driving, and the gate power mechanism adopts a gate oil cylinder for driving. The preferred scheme has the beneficial effects that it has simple structure, is easy to manufacture and is stable and reliable in operation.

[0018] Preferably, the frame comprises upper and lower frame beams, vertical beams are connected at the four corners between the upper and lower frame beams to form a main frame, the lower part of the main frame is connected with a support leg, and a plurality of reinforcing ribs are arranged on the front, back, left and right four sides of the main frame. The preferred scheme has the beneficial effects that it has reasonable structure, low cost, high support strength and strong anti-seismic capacity.

[0019] Preferably, a ring-shaped platform is arranged in the middle of the frame, a safety guardrail is arranged around the ring-shaped platform, the waste heat fan is installed on the ring-shaped platform, and the burners of the respective combustion chambers are located at a position on the upper part of the ring-shaped platform suitable for observation, maintenance and repair by workers. The preferred scheme has the beneficial effects that the waste heat fan is provided with an installation position, and at the same time, it is convenient for equipment maintenance personnel to perform maintenance and repair on the waste heat fan and the burners, thereby ensuring production safety.

[0020] Preferably, a kiln top platform is arranged at the upper part of the kiln body, and a safety guardrail is arranged on the upper frame beam around the kiln top platform. The preferred scheme has the beneficial effects that it is convenient for equipment maintenance personnel to perform maintenance and repair on the air closing feeding device, thereby ensuring production safety.

[0021] Preferably, a straight or inclined ladder is arranged between the ground and the annular platform, and a straight or inclined ladder is arranged between the annular platform and the kiln top platform. The preferred scheme has the beneficial effect of facilitating the work of equipment maintenance personnel.

[0022] Compared with the prior art, the present application has the beneficial effect of:

[0023] (1) The present application sets N combustion chambers made of high-temperature-resistant material with open lower ends in the calcination zone. The radiant heat of the outer walls of the combustion chambers can be absorbed and utilized by the surrounding ore. The combustion chambers have open lower ends, and the fine powder fuel or combustible gas emitted from the burners has a large combustion space for sufficient combustion. The high-temperature smoke and fire is emitted from the open lower ends of the combustion chambers and burns from bottom to top in the calcination passages (also referred to as calcination chambers) between the combustion chambers. The calcination passages are uniformly distributed, which can fully and uniformly calcine the ore.

[0024] (2) The present application is provided with a kiln-in-heat-pipe in the cooling zone, especially a plurality of kiln-in-heat-pipes uniformly arranged in the cooling zone, and a plurality of air inlet holes uniformly distributed on the lower side of each kiln-in-heat-pipe. The kiln-in-heat-pipe is connected to the air inlet of the heat air fan, and the air outlet of the heat air fan is connected to each air supply interface pipe through the kiln-out-heat-pipe to provide hot air and oxygen to each combustion chamber. Under the action of the heat air fan, the outdoor air is accelerated to flow into the cooling zone and is absorbed by the kiln-in-heat-pipes distributed in the cooling zone, and the ore that has been calcined in the cooling zone is rapidly cooled. The ore cooling speed is fast, and the cooling effect is good. At the same time, the air heated by the ore is blown into the combustion chamber, the waste heat is recovered, the combustion temperature is increased, the hot air supplies air to the combustion chamber, and it is also beneficial to the full oxygen combustion of the fine powder fuel or combustible gas sprayed into the combustion chamber.

[0025] (3) The present application is provided with a kiln-in-smoke-pipe connected to the outside of the kiln body in the preheating zone, especially a plurality of kiln-in-smoke-pipes uniformly arranged in the preheating zone, and a plurality of smoke outlet holes uniformly distributed on the lower side of each kiln-in-smoke-pipe. Further under the action of the smoke fan, the smoke that burns upward from the calcination zone can uniformly pass through the preheating zone, the ore preheating is uniform, which is beneficial to the further uniform calcination of the ore and ensures the product quality. In addition, the design of the smoke fan further increases the ventilation volume inside the kiln body, which is beneficial to the oxygen combustion, improves the combustion effect, improves the thermal efficiency of the fuel, and is also beneficial to reducing environmental pollution, has the effect of energy saving and emission reduction. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a perspective structural schematic diagram of the vertical continuous calcination lime kiln of the present application;

[0027] Figure 2 is a kiln body perspective structural schematic diagram of the vertical continuous calcination lime kiln of the present application;

[0028] Figure 3 is a vertical section structure schematic diagram of the kiln body of the vertical continuous lime calcining kiln of the present application;

[0029] Figure 4 is a working state schematic diagram of the vertical continuous lime calcining kiln of the present application;

[0030] Figure 5 is a vertical structure schematic diagram of the combination state of the kiln internal waste heat pipe, burner and cyclone dust collector of the vertical continuous lime calcining kiln of the present application;

[0031] Figure 6 is a vertical structure schematic diagram of the burner of the vertical continuous lime calcining kiln of the present application;

[0032] Figure 7 is a vertical structure schematic diagram of the kiln internal waste heat pipe of the vertical continuous lime calcining kiln of the present application;

[0033] Figure 8 is a vertical structure schematic diagram of the kiln internal flue gas pipe of the vertical continuous lime calcining kiln of the present application.

[0034] In the figure: 1 - upper frame beam, 2 - lower frame beam, 3 - vertical beam, 4 - reinforcing rib, 5 - support foot, 6 - annular platform, 7 - kiln top platform, 8 - straight ladder, 9 - square cylindrical metal shell, 10 - thermal insulation layer, 11 - refractory layer, 12 - preheating zone, 13 - calcining zone, 14 - cooling zone, 15 - closed air inlet device, 16 - continuous discharge device, 17 - burner, 18 - cylinder, 19 - flange, 20 - air supply interface pipe, 21 - fuel interface pipe, 22 - sinking groove, 23 - ignition interface, 24 - temperature measurement interface, 25 - kiln internal waste heat pipe, 26 - air inlet hole, 27 - waste heat fan, 28 - cyclone dust collector, 29 - kiln external waste heat pipe, 30 - kiln internal flue gas pipe, 31 - flue gas outlet hole, 32 - downward flue, 33 - upward flue, 34 - flue gas fan, 35 - combustion chamber, 36 - calcining chamber, 37 - high-temperature-resistant partition plate, 38 - high-temperature-resistant top sealing plate, 39 - roof-type furnace grate, 40 - material supporting plate, 41 - discharge hopper, 42 - inter-grate material falling port, 43 - inter-plate material falling port, 44 - material pushing plate, 45 - connecting rod, 46 - material pushing oil cylinder, 47 - square cylindrical feed hopper, 48 - gate oil cylinder, 49 - upper gate, 50 - lower gate, 50 - inverted U-shaped high-temperature-resistant protective cover. DETAILED DESCRIPTION

[0035] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0036] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which the present invention belongs. In the description of this application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to has a specific direction, is constructed and operates in a specific direction, and therefore should not be understood as limiting the present invention.

[0037] Example: Figures 1 to 8 As shown, a vertical continuous calcining lime kiln includes a frame and a kiln body supported by the frame, the frame includes an upper frame beam 1 and a lower frame beam 2, vertical beams 3 are connected to the four corners between the upper frame beam 1 and the lower frame beam 2 to form a main frame, a plurality of reinforcing ribs 4 are provided on the four faces of the main frame, and six supporting legs 5 are connected to the lower part of the main frame; an annular platform 6 is provided in the middle of the frame, a safety guardrail is provided around the annular platform 6, a straight ladder 8 is provided between the ground and the annular platform 6, a kiln top platform 7 is provided on the upper part of the frame, a safety guardrail is provided on the upper frame beam around the kiln top platform 7, and a straight ladder 8 is provided between the annular platform 6 and the kiln top platform 7.

[0038] The kiln body includes a square cylindrical metal shell 9 and an insulating refractory layer arranged on the inner wall of the square cylindrical metal shell 9, and the insulating refractory layer includes an outer insulating layer 10 and an inner refractory layer 11; the interior of the kiln body is divided into a preheating zone 12, a calcining zone 13 and a cooling zone 14 from top to bottom; a closed air feeding device 15 is provided at the top of the kiln body, and a continuous discharging device 16 is provided at the bottom of the kiln body.

[0039] The shell is a square cylindrical metal shell 9, the front metal shell and the front thermal insulation and refractory layer constitute the front kiln wall, the rear metal shell and the rear thermal insulation and refractory layer constitute the rear kiln wall, the left metal shell and the left thermal insulation and refractory layer constitute the left kiln wall, and the right metal shell and the right thermal insulation and refractory layer constitute the right kiln wall.

[0040] Eight silicon carbide plates are vertically connected between the left refractory layer 11 and the right refractory layer 11 in the calcining zone 13 to form a high-temperature resistant partition 37. The refractory layer 11, the high-temperature resistant partition 37 made of silicon carbide plates and the high-temperature resistant top plate 38 made of silicon carbide plates constitute the five combustion chambers 35 with openings at the lower ends. Between adjacent combustion chambers 35 are four calcining chambers 36 with openings at both the upper and lower ends. Each combustion chamber 35 has a combustion port arranged on the right kiln wall.

[0041] The burner 17 is provided on the combustion port, and the burner 17 comprises a cylinder 18 with a closed outer end and an open inner end, a flange 19 is provided on the inner end of the cylinder 18, a lower side of the cylinder 18 is communicated with a wind inlet pipe 20, and a fuel inlet pipe 21 is provided on the closed end of the cylinder 18; a sinking groove 22 is provided on the closed end of the cylinder 18, and an ignition interface 23 and a temperature measuring interface 24 are provided on an outer end surface of the sinking groove 22.

[0042] The cooling zone 14 is provided with four evenly arranged kiln internal waste heat pipes 25 communicated to the outside of the right kiln wall, a plurality of evenly distributed air inlet holes 26 are provided on the lower side of each kiln internal waste heat pipe 25; a high-temperature protection cover 51 made of silicon carbide plate is arranged on each kiln internal waste heat pipe 25; the outer side ends of the four kiln internal waste heat pipes 25 are communicated to the air inlet of a cyclone dust collector 28, the air outlet of the cyclone dust collector 28 is communicated to the air inlet of a waste heat fan 27 installed on the annular platform 6, and the air outlet of the waste heat fan 27 is communicated to the wind inlet pipe 20 of each burner 17 through a kiln external waste heat pipe 29 to provide hot air and oxygen for each combustion chamber 35.

[0043] The preheating zone 12 is provided with four evenly arranged kiln internal flue gas pipes 30 communicated to the outside of the right kiln wall, a plurality of evenly distributed flue gas outlet holes 31 are provided on the lower side of each kiln internal flue gas pipe 30; a downward flue 32 and an upward flue 33 are installed on the ground outside the kiln body, and the outer side ends of the four kiln internal flue gas pipes 30 are communicated to the upper end of the downward flue 32, and the downward flue 32 and the upward flue 33 are provided with a smoke dust fan 34.

[0044] The closed air feeding device 15 comprises a square cylindrical feeding hopper 47, and an upper gate 49 and a lower gate 50 driven to open and close by a gate oil cylinder 48 are arranged on the upper part and the lower part of the square cylindrical feeding hopper 47, respectively.

[0045] The continuous discharging device 16 comprises, from top to bottom, a roof ridge type kiln grate 39, a material supporting plate 40 and a discharging hopper 41 arranged in sequence at the lower part of the cooling zone 14; the roof ridge type kiln grates 39 are arranged in five rows in the front-rear direction with a spacing of 30 cm between the roof ridge type kiln grates 39 as a grate-to-grate discharging port 42, a material supporting plate 40 parallel to the grate-to-grate discharging port 42 is arranged directly below the grate-to-grate discharging port 42, a vertical spacing of 25 cm is left between the grate-to-grate discharging port 42 and the material supporting plate 40, the width of the material supporting plate is 85 cm, and a spacing of 35 cm is arranged between the material supporting plates as a plate-to-plate discharging port 43; a pushing plate 44 is arranged on each material supporting plate 40, and each pushing plate 44 is connected together by three connecting rods 45 to form a pushing assembly, the pushing assembly is driven by a pushing oil cylinder 46 to reciprocate in the front-rear direction, and the pushing plate 44 continuously pushes the baked stone from the material supporting plate 40 into the discharging hopper 41.

[0046] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application.

Claims

1. A vertical continuous calcining lime kiln comprising a frame and a kiln body supported by the frame, the kiln body comprising a shell and a heat-insulating refractory layer provided on the inner wall of the shell, the interior of the kiln body being divided into a preheating zone, a calcining zone, and a cooling zone from top to bottom; a closed-air feeding device being provided at the top of the kiln body, and a continuous discharging device being provided at the bottom of the kiln body; characterized in that: The shell is a square cylindrical metal shell, and the thermal insulation refractory layer arranged on the inner side of the metal shell includes an outer thermal insulation layer and an inner refractory layer; the front metal shell and the front thermal insulation refractory layer constitute the front kiln wall, the rear metal shell and the rear thermal insulation refractory layer constitute the rear kiln wall, the left metal shell and the left thermal insulation refractory layer constitute the left kiln wall, and the right metal shell and the right thermal insulation refractory layer constitute the right kiln wall; in the calcination zone, a number of high-temperature resistant partitions are vertically connected between the left refractory layer and the right refractory layer, and the refractory layer, the high-temperature resistant partition and the high-temperature resistant capping plate constitute N combustion chambers with open lower ends, and there are N-1 adjacent combustion chambers with both upper and lower ends open. A calcining chamber, each combustion chamber is provided with a combustion port connected to the outside of the kiln body, and the combustion port is arranged on the left kiln wall or the right kiln wall corresponding to each combustion chamber; a burner is provided on the combustion port, and the burner is provided with a fuel interface pipe connected to the fuel supply pipeline and an air supply interface pipe for supplying air to the combustion chamber; high-temperature fireworks are ejected from the opening at the lower end of the combustion chamber and burn from bottom to top in the calcining chamber between the combustion chambers; a kiln waste heat pipe connected to the outside of the kiln body is provided in the cooling zone, and each kiln waste heat pipe is provided with an inverted U-shaped high-temperature resistant protective cover, the kiln waste heat pipe is connected to the air inlet of the waste heat fan, and the air outlet of the waste heat fan is connected to each air supply interface pipe through the waste heat pipe outside the kiln to provide hot air and oxygen to each combustion chamber; a kiln flue gas pipe connected to the outside of the kiln body is provided in the preheating zone, and the outer end of the kiln flue gas pipe is connected to the chimney.

2. The vertical continuous calcining lime kiln according to claim 1, characterized in that: There are multiple waste heat pipes in the kiln, which are evenly arranged in the cooling zone. A number of evenly distributed air inlet holes are provided on the lower side of each waste heat pipe in the kiln; the outer ends of the multiple waste heat pipes in the kiln are connected to the air inlet of a cyclone dust collector, and the air outlet of the cyclone dust collector is connected to the air inlet of the waste heat blower.

3. The vertical continuous calcining lime kiln according to claim 2, characterized in that: There are multiple kiln smoke pipes, which are evenly arranged in the preheating zone. A plurality of evenly distributed smoke outlets are provided on the lower side of each kiln smoke pipe, and the outer ends of the multiple kiln smoke pipes are connected to the chimney.

4. The vertical continuous calcining lime kiln according to claim 3, characterized in that: The chimney comprises a descending chimney and an ascending chimney installed on the ground. The outer ends of multiple kiln flue gas pipes are connected to the upper end of the descending chimney. A smoke fan or dust removal equipment is arranged between the descending chimney and the ascending chimney.

5. The vertical continuous calcining lime kiln according to claim 4, characterized in that: The high-temperature resistant partition plate, the high-temperature resistant capping plate and the inverted U-shaped high-temperature resistant protective cover are made of silicon carbide plates.

6. The vertical continuous calcining lime kiln according to claim 5, characterized in that: The burner comprises a cylinder with a closed outer end and an open inner end. The inner end of the cylinder is provided with a flange. The lower side of the cylinder is connected to the air supply interface pipe. The closed end of the cylinder is provided with a fuel interface pipe, an ignition interface and a temperature measurement interface.

7. The vertical continuous calcining lime kiln according to claim 6, characterized in that: A sinking groove is provided at the closed end of the cylinder, and the ignition interface and the temperature measurement interface are arranged on the outer end surface of the sinking groove.

8. The vertical continuous calcining lime kiln according to claim 7, characterized in that: The continuous discharging device includes a kiln grate, a supporting plate and a discharging hopper arranged in sequence from top to bottom in the lower part of the cooling zone; the kiln grate is a plurality of ridge-type kiln grate arranged in a front-to-back direction, and the interval gaps between the ridge-type kiln grate are the grate blanking openings, and a supporting plate parallel to the blanking openings is arranged directly below the grate blanking openings, and a certain vertical spacing is left between the grate blanking openings and the supporting plates, the width of the supporting plates is greater than the width of the grate blanking openings, and the interval gaps between the supporting plates are the supporting plate blanking openings; each supporting plate is provided with a pushing plate, and each pushing plate is connected together by 2 to 3 connecting rods to form a pushing assembly, and the pushing assembly is driven by a pushing power mechanism to reciprocate forward and backward, and the pushing plate continuously pushes the fired stone into the discharging hopper.

9. The vertical continuous calcining lime kiln according to claim 8, characterized in that: The air-tight feeding device comprises a square cylindrical feeding hopper, and an upper gate and a lower gate driven to open and close by a gate power mechanism are respectively arranged on the upper and lower parts of the square cylindrical feeding hopper.

10. The vertical continuous calcining lime kiln according to claim 9, characterized in that: The pushing power mechanism is driven by a pushing oil cylinder, and the gate power mechanism is driven by a gate oil cylinder.

11. The vertical continuous calcining lime kiln according to claim 10, characterized in that: The frame includes an upper frame beam and a lower frame beam. The four corners between the upper frame beam and the lower frame beam are connected by vertical beams to form a main frame. The lower part of the main frame is connected to the supporting legs. Several reinforcing ribs are set on the four faces of the main frame.

12. The vertical continuous calcining lime kiln according to claim 11, characterized in that: An annular platform is provided in the middle of the frame, and a safety guardrail is provided around the annular platform. The waste heat blower is installed on the annular platform, and the burners of each combustion chamber are located at a position on the upper part of the annular platform suitable for staff to observe, inspect and maintain.

13. The vertical continuous calcining lime kiln according to claim 12, characterized in that: A kiln roof platform is provided on the upper part of the kiln body, and a safety guardrail is provided on the upper frame beam surrounding the kiln roof platform.

14. The vertical continuous calcining lime kiln according to claim 13, characterized in that: A straight ladder or an inclined ladder is provided between the ground and the annular platform, and a straight ladder or an inclined ladder is provided between the annular platform and the kiln top platform.

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