Kiln heat cycle energy saving system

Abstract

The present invention relates to the technical field of kilns, specifically to a kiln heat cycle energy-saving system, including a preheating zone, a firing zone and a cooling zone, the side wall of the preheating zone is provided with a first opening, the side wall of the firing zone is provided with a second opening, the side wall of the cooling zone is provided with a third opening, and the preheating zone, the firing zone and the cooling zone are all provided with a number of combustion-supporting through holes that match the installed flame nozzles; and also include: a hot air duct, a combustion-supporting duct, a fan, a redirecting duct and a rotating barrel, the hot air duct connects the third opening and the second opening with the first opening respectively, the hot air duct between the first opening and the second opening forms a preheating channel, the hot air duct between the third opening and the second opening forms a heat preservation channel, the fan is fixed in the heat preservation channel and the preheating channel, and is used to draw the high-temperature flue gas in the firing zone into the hot air duct; the combustion-supporting duct is tightly fitted and fixed to the hot air duct. Compared with the traditional solution, the present invention improves the gas jet in the kiln and avoids the jet from continuously affecting the local temperature of the kiln.

Description

Technical Field

[0001] The invention relates to the technical field of kilns, and in particular to a kiln heat cycle energy-saving system. Background Art

[0002] As humans entered the industrial society, kilns have developed rapidly. They are also playing an increasingly important role in various industries. In order to make the kiln burn satisfactory products, it is necessary to control its firing process. However, when the existing tunnel kiln heats the interior, it is unable to recycle the used hot air, resulting in poor heat preservation performance of the hot air. After heating, the heat is easily lost, causing people to waste energy when heating it, which is not conducive to cost saving and is not in line with the concept of environmental protection.

[0003] The heat taken away by the flue gas from the kilns of ceramic enterprises is huge, accounting for 25% to 35% of the total heat of the kilns. If this part of waste heat is utilized, the economic benefits are considerable. However, in actual application, due to people's lack of energy-saving concepts and backward technical level, the utilization rate of waste heat from flue gas in my country's ceramic kilns is very low, generally only 2% to 3%.

[0004] For example, in the utility model document with Chinese patent publication number CN208832976U, a heat circulation tunnel kiln includes a tunnel kiln body, which is composed of an outer wall and an inner insulation brick wall. The tunnel kiln body is divided into a preheating zone, a firing zone and a cooling zone. The inner walls on both sides of the outer wall are provided with inner insulation brick walls, and a main heating pipeline is provided on the top of the tunnel kiln body. One end of the cooling zone passes through the inner insulation brick wall and the outer wall to provide a first lower circulation pipeline, and the other end of the first lower circulation pipeline is fixedly installed with a first exhaust fan, and the top of the first exhaust fan is fixedly connected with a first upper circulation pipeline, and the other end of the first upper circulation pipeline is connected to the main heating pipeline.

[0005] The kiln cart carries the pottery jar from the entrance to the exit, passing through the preheating zone, firing zone and cooling zone in turn. Usually, the transition temperature from the preheating zone to the firing zone is 800-850℃. After that, the heat transfer in the kiln includes both heat convection and heat radiation. When the temperature difference in the firing zone exceeds 15℃, it may cause the product to have under-fired or over-fired defects such as orange glaze, pinholes, glaze bubbles and even deformation. In order to reduce the temperature difference in the firing zone, the heat radiation from the kiln wall and the kiln top flames complement each other. In the actual kiln design, the best position of the upper flame nozzle should be selected between the kiln top and the upper edge of the fired product, and the environment near the flame nozzle mouth should be improved to avoid excessive local temperature in the kiln.

[0006] The above technology recycles and reuses the waste heat generated by cooling water spray and the waste heat emitted by heating and baking by adding exhaust fans and circulation pipelines. The heat in the heating chamber enters the channel of the tunnel kiln through the gap in the inner wall. The outer wall adopts a closed structure to reduce heat waste. However, this patent only recycles the waste heat generated by cooling water spray and the waste heat emitted by heating and baking, and does not improve the jet generated by the combustion-supporting gas entering the kiln.

[0007] Usually, the combustion-supporting gas is the outside air. After the air enters the air inlet channel, it is powered by the fan. Even in other schemes, the waste heat (of the exhaust gas) is used to exchange heat with the incoming air to increase the temperature of the incoming air and prevent the incoming air from affecting the temperature inside the kiln. However, in actual use, there is still a large temperature difference between the incoming air and the inside of the kiln. When entering, this part of the air usually enters the kiln in the form of a jet under the action of the fan, and then contacts with the fuel (mostly natural gas, coal gas) sprayed by the fuel nozzle to support combustion. The outside air directly enters the kiln body, causing the jet to continuously exchange heat with the local area in the kiln, causing some low-temperature areas in the kiln body. If this part of the low-temperature area contacts the fired product, it will cause uneven heating of the product in severe cases, affecting the product molding quality (even affecting the product firing success rate). Therefore, a kiln heat circulation energy-saving system is needed that can improve the gas jet in the kiln and prevent the jet from continuously affecting the local temperature of the kiln. Summary of the invention

[0008] The invention provides a kiln heat cycle energy-saving system, which aims to improve the gas jet in the kiln and prevent the jet from continuously affecting the local temperature of the kiln.

[0009] In order to achieve the above objectives, this solution provides the following technical solutions:

[0010] The kiln heat cycle energy-saving system includes a preheating zone, a firing zone and a cooling zone. The side wall of the preheating zone is provided with a first opening, the side wall of the firing zone is provided with a second opening, and the side wall of the cooling zone is provided with a third opening. The preheating zone, the firing zone and the cooling zone are all provided with a plurality of combustion-supporting through holes matching the installed flame nozzles.

[0011] It also includes: a hot air pipe, a combustion-supporting pipe, a fan, a redirecting pipe and a rotating barrel. The hot air pipe connects the third opening and the second opening with the first opening respectively. The hot air pipe between the first opening and the second opening forms a preheating channel. The hot air pipe between the third opening and the second opening forms a heat preservation channel. The fan is fixed in the heat preservation channel and the preheating channel to draw the high-temperature flue gas in the burning zone into the hot air pipe. The combustion-supporting pipe is tightly fitted and fixed to the hot air pipe. One end of the combustion-supporting pipe is connected to the combustion-supporting through hole, and the other end of the combustion-supporting pipe is connected to the atmosphere.

[0012] The base end of the redirecting pipe is fixed at the combustion-supporting through hole on the inner wall of the kiln body and is connected to the combustion-supporting through hole. The rotating barrel is covered with the free end of the redirecting pipe and is rotatably connected to the redirecting pipe. A wind receiving plate is obliquely fixed on the inner side of the rotating barrel, which drives the rotating barrel to rotate under the action of the airflow in the redirecting pipe. A plurality of outlets are opened on the side of the rotating barrel, and one of the outlets is directly facing the flame nozzle.

[0013] Principle and beneficial technical effects of this technical solution:

[0014] Because it includes a kiln body and a hot air duct, a preheating channel is opened in the preheating zone, and an insulation channel is opened in the firing zone of the kiln body, and the fan is fixed in the insulation channel and the preheating channel, so when the kiln is in operation, the high-temperature flue gas in the firing zone and the cooling zone will be drawn into the hot air duct from the insulation channel and the cooling channel by the fan, and the waste heat in the extracted high-temperature flue gas will exchange heat with the cold air in the preheating zone and the combustion air in the combustion-supporting tube (because the combustion-supporting tube is tightly fitted and fixed to the hot air duct), so as to achieve the preheating effect of the preheating zone product and the heating effect of the combustion-supporting gas, saving energy consumption. In this scheme, the combustion-supporting gas includes the combustion-supporting gas entering from the preheating zone in a conventional manner and the combustion-supporting gas entering from the combustion-supporting tube in a precise combustion-supporting manner. The above-mentioned waste heat utilization process is mainly for the combustion-supporting gas entering from the combustion-supporting tube.

[0015] However, if the combustion-supporting gas entering the combustion-supporting tube is not restrained, it will form a gas-submerged jet. That is, the flow formed by the gas ejecting outward from the orifice, nozzle or slit is called a gas-submerged jet, or gas jet for short. The jet diffuses forward at a certain diffusion angle. During the formation of the jet, a lateral momentum exchange will occur, and the appearance of a vortex will allow heat exchange. In other words, since there is a large temperature difference between the temperature of this part of the combustion-supporting gas and the temperature of the burning zone or the flame nozzle, there is a temperature difference in the outlet section and the axis, especially in the axis part. If it is in stable contact with the product within its range, it is very easy to cause uneven heating of the product, affecting the firing quality of the product.

[0016] In the present scheme, the rotating barrel is rotatably connected to the redirecting pipe, the inner side of the rotating barrel is inclined and fixed with a wind receiving plate, and multiple outlets are opened on the rotating barrel. The inlet of the redirecting pipe is fixed at the combustion-supporting channel on the kiln body. Therefore, when the wind in the combustion-supporting channel enters the redirecting pipe and comes out from the outlet of the redirecting pipe, it will impact the wind receiving plate fixed on the inner side of the rotating barrel, driving the rotating barrel to rotate, so that the wind in the preheating channel will be ejected from multiple outlets in the rotating barrel, so that the jet in the original state will not always be ejected to one area, thereby avoiding local uneven heating of the products to be processed and causing quality problems.

[0017] The heat transfer method in the kiln is both convection heat transfer and radiation heat transfer. When the temperature difference in the firing zone exceeds 15℃, it may cause under-firing or over-firing defects such as orange glaze, pinholes, glaze bubbles and even deformation. In order to avoid the large temperature difference in the kiln affecting the product quality, the area where the preheating zone is converted to the firing zone is equipped with more flame nozzles than other areas, and there is a risk of excessive temperature in some areas. Because there are multiple outlets on the rotating barrel, including an outlet facing the flame nozzle of the firing zone, the combustion-supporting wind from the combustion-supporting channel will impact the flame nozzle. It can not only fully mix the high-temperature air near the flame nozzle with the low-temperature air of the gas jet, but also shorten the range of the low-temperature air of the gas jet, reducing the impact range of the low-temperature area. It meets the need for oxygen in the flame combustion environment in the kiln while avoiding the situation of excessive local temperature difference in the kiln body.

[0018] This solution realizes the demand for improving the gas jet in the kiln, changes the way the combustion-supporting air enters the combustion-supporting channel, so that the original limited space jet no longer continuously shoots in a fixed direction in the kiln, avoids excessive local heat exchange, reduces the occurrence of problems such as orange glaze, pinholes, glaze bubbles, and even deformation, under-firing or over-firing defects, improves the molding quality of the product, makes full use of the waste heat of the kiln, and saves energy loss; the combustion-supporting air impacts the area around the flame nozzle, solves the problem of excessive local temperature in the kiln caused by too many flame nozzles in the area where the preheating zone is converted to the firing zone, and at the same time meets the need for oxygen in the flame combustion environment in the kiln.

[0019] Furthermore, the outlet on the rotating barrel facing the burning zone flame nozzle is arranged so that during one half to two thirds of a full rotation, the outlet faces the burning zone flame nozzle.

[0020] Beneficial effect: It not only takes into account the cooling demand for the excessively high local temperature caused by too many flame nozzles in the area where the preheating zone is converted to the firing zone, but also avoids the excessive temperature drop caused by the continuous direct blowing of the flame nozzles from the fixed outlet.

[0021] Furthermore, it also includes a temperature sensor, a controller and an air valve. The air valve is fixed at the outlet of the hot air duct, and the temperature sensor is fixed next to the outlet of the insulation channel in the kiln body to detect the temperature of the firing zone of the kiln body; the controller is used to receive the signal of the temperature sensor and determine whether the temperature meets the threshold value. If the temperature is within the threshold range, the air valve is opened; if the temperature is lower than the threshold value, the air valve is closed.

[0022] Beneficial effects: maximize the use of waste heat from the burning zone, avoid the adverse effect of excessive flue gas extraction on the temperature of the burning zone, and realize intelligent gas valve regulation.

[0023] Furthermore, it also includes insulation bricks and insulation boards. Insulation bricks are placed on the surface of the kiln car, and insulation boards are placed on the insulation bricks.

[0024] Beneficial effect: It can achieve heat insulation for the surface of the kiln car, and prevent the high temperature in the kiln from being directly transmitted to the kiln car, causing irreversible damage to the kiln car structure.

[0025] Furthermore, a gap of 0.1 cm to 0.3 cm is left between the insulation bricks.

[0026] Beneficial effect: The gaps left between the insulation bricks can prevent the insulation bricks from expanding due to heat in a high temperature environment and causing the bricks to crack. The gaps of appropriate distance will not excessively reduce the insulation effect of the insulation bricks, saving energy.

[0027] Furthermore, the wheels of the kiln car are made of ZG340-640 material.

[0028] Beneficial effect: When the wheel strength is insufficient, the surface hardness is shallow or there is no quenching at all, the wheel wears quickly, which will affect the normal operation of the kiln car and product transportation. The use of wheels made of ZG340-640 material can improve the wheel strength and ensure the normal operation of the kiln car and product transportation.

[0029] Furthermore, it also includes a sand sealing plate, a support frame and a sand sealing groove, wherein the bottom surface of the sand sealing groove is fixed to the upper surface of the support frame, the sand sealing plate is fixed to the side of the kiln car, and the sand sealing groove is filled with sand particles that can still cover the bottom end of the sand sealing plate when the kiln car is traveling.

[0030] Beneficial effects: It ensures the sealing effect during the movement of the kiln car, has good heat insulation effect, greatly reduces the heat exchange between the upper and lower surfaces of the kiln car, and protects the lower surface of the kiln car from damage caused by high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a partial cross-sectional view of the rotating barrel of the present invention;

[0032] Figure 2 A three-dimensional view of the rotating barrel of the present invention;

[0033] Figure 3 It is the front view of the kiln car mouth of the present invention. DETAILED DESCRIPTION

[0034] The following is a further detailed description through specific implementation methods:

[0035] The figure numerals in the drawings of the specification include: 1. kiln body; 2. track; 3. sand sealing groove; 4. support frame; 5. kiln car; 6. insulation brick; 7. insulation board; 8. stacked brick; 9. sand sealing board; 10. rotating barrel; 11. wind receiving plate; 12. redirecting pipe.

[0036] Implementation example Figure 1-3 As shown:

[0037] The kiln heat cycle energy-saving system comprises a kiln body 1, wherein the kiln body 1 comprises a preheating zone, a firing zone and a cooling zone, wherein the side wall of the preheating zone is provided with a first opening, the side wall of the firing zone is provided with a second opening, and the side wall of the cooling zone is provided with a third opening, and the preheating zone, the firing zone and the cooling zone are all provided with a plurality of combustion-supporting through holes matching the installed flame nozzles; and further comprises:

[0038] A hot air duct, a combustion-supporting duct, a fan, a redirecting duct 12 and a rotating barrel 10, the hot air duct connects the third opening and the second opening with the first opening respectively, the hot air duct between the first opening and the second opening forms a preheating channel, the hot air duct between the third opening and the second opening forms an insulation channel, the fan is fixed in the insulation channel and the preheating channel, and is used to draw the high-temperature flue gas in the burning zone into the hot air duct; the combustion-supporting duct is tightly fitted and fixed to the hot air duct, one end of the combustion-supporting duct is connected to the combustion-supporting through hole, and the other end of the combustion-supporting duct is connected to the atmosphere.

[0039] The sensing unit includes a temperature sensor, a controller and an air valve. The air valve is welded at the outlet of the hot air duct. The temperature sensor adopts a 1105BK temperature sensor, which is a thermocouple assembly with a ceramic protection tube. It is suitable for temperature measurement in the combustion process and hot gas environment. The maximum operating temperature is 1500℃, which can be fully applied to the high temperature environment in the kiln. The temperature sensor is bolted to the side of the insulation channel opening in the kiln body 1 to detect the temperature of the firing zone of the kiln body 1; the controller adopts the STM32F103ZET6 single-chip microcomputer, which is placed outside the kiln to avoid the influence of the high temperature environment in the kiln. At the same time, the single-chip microcomputer is low-priced, highly reliable and low-noise. The controller is used to receive the signal of the temperature sensor and determine whether the temperature meets the threshold. The threshold area of ​​the temperature is selected as 1110℃-1150℃. If the temperature is within the threshold range, the gas valve is opened. If the temperature is lower than the threshold, the gas valve is closed, thereby maximizing the use of the waste heat of the firing zone, avoiding the adverse effect of extracting too much high-temperature flue gas on the temperature of the firing zone, and realizing intelligent gas valve adjustment.

[0040] During the operation of the kiln, the waste heat in the high-temperature flue gas in the firing zone and the cooling zone will be extracted by the fan into the hot air duct from the insulation channel and the cooling channel, and then enter the preheating channel. The waste heat in the furnace is used for heat circulation to achieve the preheating effect on the preheating zone product and the heating effect on the combustion-supporting gas, saving energy consumption.

[0041] The rotating barrel 10 is rotatably connected to the redirecting pipe beside the combustion-supporting port of the firing zone through the pulley welded on the barrel edge and the slide groove opened on the redirecting pipe. The wind receiving plate 11 is welded obliquely on the inner side of the rotating barrel 10. The rotating barrel 10 is provided with multiple outlets, including outlets facing the periphery of the flame nozzle of the firing zone. The outlet facing the flame nozzle of the firing zone on the rotating barrel 10 is set as an arc-shaped through hole with an angle of 180 to 240 degrees. The outlet is facing the flame nozzle of the firing zone. The inlet of the redirecting pipe 12 is welded at the combustion-supporting channel on the inner wall of the kiln body 1. The base end of the redirecting pipe is fixed at the combustion-supporting through hole on the inner wall of the kiln body and communicated with the combustion-supporting through hole.

[0042] It not only takes into account the cooling demand for the local excessive temperature caused by too many flame nozzles in the transition area from the pre-stage to the firing zone, but also avoids the excessive temperature reduction caused by the continuous direct blowing of the flame nozzles from the fixed outlet.

[0043] The flow formed by the gas ejected outward from the orifice, nozzle or slit is called a gas submerged jet, or gas jet for short. The jet diffuses forward at a certain diffusion angle. In the process of jet formation, lateral momentum exchange occurs, and the appearance of vortex enables heat exchange. When the wind in the combustion-supporting channel enters the redirecting tube 12 and comes out from the outlet of the redirecting tube 12, it will impact the wind receiving plate 11 welded on the inner side of the rotating barrel 10, driving the rotating barrel 10 to rotate, so that the wind in the preheating channel will be ejected from multiple outlets in the rotating barrel 10, so that the jet in the original state will not always be ejected to one area, thereby avoiding excessive local temperature differences of the products to be processed and causing quality problems.

[0044] The kiln car 5 is pushed by the lifting machine. After the kiln car 5 enters the kiln by rolling on the track 2, the lifting machine returns to exit the kiln and the kiln door is closed. The kiln car 5 passes through the preheating zone, firing zone and cooling zone in the kiln in turn until it is finally taken out of the kiln and formed. After the area where the preheating zone is converted to the firing zone, the heat transfer mode in the kiln is both convective heat transfer and radiative heat transfer. When the temperature difference in the firing zone exceeds 15°C, it may cause under-firing or over-firing defects such as orange glaze, pinholes, glaze bubbles and even deformation. In order to avoid the large temperature difference in the kiln affecting the product quality, the area where the preheating zone is converted to the firing zone is equipped with more flame nozzles than other areas, and there is a risk of over-temperature in some areas. The combustion-supporting wind that exits from the combustion-supporting channel and exits from the outlet around the flame nozzle of the firing zone will impact the area around the flame nozzle, which meets the need for oxygen for the flame combustion environment in the kiln while avoiding excessive temperature in some areas of the kiln body 1.

[0045] The heat insulation unit includes heat insulation bricks 6, sand sealing plates 9 and sand sealing grooves 3. The sand sealing grooves 3 are bolted to the lower end of the side walls of the kiln body 1. The support frame 4 for supporting the sand sealing grooves 3 is bolted to the side walls of the kiln body 1 and bolted to the lower end of the sand sealing grooves 3 to provide good support for the sand sealing grooves 3. Sand grains are filled in the sand sealing grooves 3. The side surfaces of the sand sealing plates 9 are bolted to the side surfaces of the kiln car 5. The sand sealing plates 9 are inserted into the sand grains in the sand sealing grooves 3. The sand grains can pass through a 0.2*0.2cm filter screen. The sand grains used in the sand sealing grooves 3 cannot be too large. If the sand grains are too large, they will be plowed up by the sand sealing plates 9 of the passing kiln car 5. At this time, there are gaps between the sand grains. The gaps cannot play a sealing role, and it is impossible to prevent the cold air from the bottom of the car from entering the kiln chamber or the high-temperature gas from the kiln chamber from squeezing into the bottom of the car. When the kiln car 5 is running, the sand sealing plate 9 moves in the sand sealing groove 3 and forms a good heat insulation layer between the sand particles, thereby ensuring the sealing effect of the upper and lower surfaces of the kiln car 5. The heat insulation effect is first-class, reducing the heat exchange between the hot air on the upper surface of the kiln car 5 and the air on the lower surface of the kiln car 5, and effectively protecting the lower surface of the kiln car 5 from damage caused by high temperature.

[0046] Heat-insulating bricks 6 are placed on the kiln car 5. The two sides of the tunnel kiln, the kiln top and the kiln car 5 surface form the four heating surfaces of the kiln. Except for the kiln car 5 surface, the other three surfaces keep a constant temperature during the kiln firing process. Their heat consumption is limited to the heat loss conducted outward. The kiln car 5 is pushed into the tunnel kiln at room temperature. When the kiln car 5 moves forward in the kiln, in addition to the heat conducted downward, it also absorbs and stores heat to make the temperature of its car surface and the kiln road consistent. The pottery jars on the kiln car 5 pass through the preheating zone, firing zone and cooling zone in the kiln in turn, and are finally formed and taken out of the kiln. When the kiln car 5 comes out of the tunnel kiln, the temperature of the kiln car 5 will drop to room temperature again. Therefore, the use of heat-insulating bricks 6 can reduce the heat storage and heat loss of the kiln car 5.

[0047] A fixing plate is placed on the insulation brick 6, and the setting of the fixing plate facilitates the placement of the pottery pot and improves the stability of the pottery pot during the movement of the kiln car 5. A gap of 0.1 cm to 0.3 cm is left between the insulation bricks 6 to prevent the insulation bricks 6 from being thermally expanded in a high temperature environment and causing the brick body to crack. The gap of appropriate distance prevents the insulation effect of the insulation bricks 6 from being excessively reduced, saving energy.

[0048] The stacked bricks 8 are stacked on the heat insulation board 7, and then the pottery pot is placed on the stacked bricks 8, so that the bottom of the pottery pot can also be baked and formed by the high temperature in the kiln, and the heat is more evenly received.

[0049] Compared with the traditional solution, this solution realizes the demand for improving the gas jet in the kiln, changes the entry mode of the combustion-supporting air in the combustion-supporting channel, so that the original limited space jet no longer continuously shoots in a fixed direction in the kiln, avoids excessive heat exchange and affects the molding quality of the product, makes full use of the waste heat of the kiln, and saves energy loss.

[0050] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A kiln heat cycle energy-saving system, comprising a preheating zone, a firing zone and a cooling zone, characterized in that: The side wall of the preheating zone is provided with a first opening, the side wall of the burning zone is provided with a second opening, and the side wall of the cooling zone is provided with a third opening. The preheating zone, the burning zone and the cooling zone are all provided with a plurality of combustion-supporting through holes matching the installed flame nozzles; It also includes: a hot air pipe, a combustion-supporting pipe, a fan, a redirecting pipe and a rotating barrel. The hot air pipe connects the third opening and the second opening with the first opening respectively. The hot air pipe between the first opening and the second opening forms a preheating channel. The hot air pipe between the third opening and the second opening forms a heat preservation channel. The fan is fixed in the heat preservation channel and the preheating channel to draw the high-temperature flue gas in the burning zone into the hot air pipe. The combustion-supporting pipe is tightly fitted and fixed to the hot air pipe. One end of the combustion-supporting pipe is connected to the combustion-supporting through hole, and the other end of the combustion-supporting pipe is connected to the atmosphere. The base end of the redirecting tube is fixed at the combustion-supporting through hole on the inner wall of the kiln body and is connected to the combustion-supporting through hole. The outer cover of the rotating barrel is on the free end of the redirecting tube and is rotatably connected to the redirecting tube. A wind receiving plate is fixed on the inner side of the rotating barrel at an angle, which drives the rotating barrel to rotate under the action of the airflow in the redirecting tube. A plurality of outlets are opened on the side of the rotating barrel, and one of the outlets is facing the flame nozzle of the firing zone; the outlet on the rotating barrel facing the flame nozzle of the firing zone is set to rotate a full circle, and the outlet is facing the flame nozzle of the firing zone for one-half to two-thirds of the time; it also includes a temperature sensor, a controller and an air valve, the air valve is fixed at the pipe mouth of the hot air pipe, and the temperature sensor is fixed next to the insulation channel mouth in the kiln body, and is used to detect the temperature of the firing zone of the kiln body; the controller is used to receive the signal of the temperature sensor and judge whether the temperature meets the threshold range. If the temperature is within the threshold range, the air valve is opened; if the temperature is lower than the threshold range, the air valve is closed.

2. The kiln heat cycle energy saving system according to claim 1, characterized in that: It also includes a kiln car, insulation bricks and insulation boards. The insulation bricks are placed on the surface of the kiln car, and the insulation boards are placed on the insulation bricks.

3. The kiln heat cycle energy saving system according to claim 2, characterized in that: A gap of 0.1 cm to 0.3 cm is left between the insulation bricks.

4. The kiln heat cycle energy saving system according to claim 2, characterized in that: The wheels of the kiln car are made of ZG340-640 material.

5. The kiln heat cycle energy-saving system according to claim 2, characterized in that: It also includes a sand sealing plate, a support frame and a sand sealing groove, wherein the bottom surface of the sand sealing groove is fixed to the upper surface of the support frame, the sand sealing plate is fixed to the side of the kiln car, and the sand sealing groove is filled with sand particles that can still cover the bottom end of the sand sealing plate when the kiln car is traveling.

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