CN109307431B

CN109307431B - Mixed heating industrial kiln

Info

Publication number: CN109307431B
Application number: CN201811000009.7A
Authority: CN
Inventors: 张滔; 黄绍明; 苏文生; 许�鹏
Original assignee: CETC 48 Research Institute
Current assignee: Hunan ShuoKe thermal Intelligent Equipment Co.,Ltd.
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2020-10-27
Anticipated expiration: 2038-08-30
Also published as: CN109307431A

Abstract

The invention discloses a hybrid heating industrial kiln, which comprises a preheating furnace body, a heating furnace body, a constant temperature furnace body and a cooling furnace body which are sequentially arranged, wherein the heating furnace body is provided with a natural gas combustion device, the constant temperature furnace body is provided with an electric heating device, and the cooling furnace body is connected with the preheating furnace body through a waste heat pipeline. According to the invention, different heating modes are adopted according to the temperature interval of the industrial kiln and the production process of the material, so that the heat energy is utilized to the maximum extent, the sintering characteristics of the material can be matched better, the heat energy conversion efficiency is utilized to a greater extent, and the production cost is reduced.

Description

Mixed heating industrial kiln

Technical Field

The invention relates to sintering equipment, in particular to a hybrid heating industrial kiln.

Background

Green and environmental protection become important requirements for economic development, and industrial kilns are widely applied to various industrial fields as core equipment for producing various types of materials. The industrial kiln needs to raise the temperature for material production, is a mechanical device with high energy consumption, and the energy-saving and consumption-reducing technology becomes the key point of development and the trend of future industry development.

The whole sintering process of the material is a temperature range which is changed in a large range, and different temperature sections have different requirements on the heating performance of the kiln. The low temperature section mainly dries the product, discharges water and waste gas, and the temperature and atmosphere uniformity are relatively low, and the high temperature section mainly makes the product take place chemical reaction, produces qualified product, and its temperature and atmosphere uniformity require very strict. Therefore, different heat source functions can be adopted for different temperature sections according to the production process and characteristics of the product, the production requirements of the product are met, and the effects of energy conservation and environmental protection are achieved.

The existing industrial kiln is usually heated by a single heating source, and the continuous heating provides a higher temperature for a furnace chamber for sintering materials, and an electric heating mode is commonly used. This heating method does not sufficiently take the sintering characteristics of the material into account, resulting in low thermal efficiency. Different temperature sections, required heat quantity and equipped power are different, the same electric mode is adopted for heating, the performance of the electric element cannot be fully exerted, the power factor is low, and great waste of electric energy is caused. Moreover, a large amount of waste gas, water vapor and the like are generated in the sintering process of the industrial kiln, and in order to avoid short circuit of the electrical component, a protective sleeve is usually added outside the electrical component in the actual use process. However, the heating of the electrical element in the furnace is mainly realized by radiation, and the external protection tube reduces the heat radiation efficiency of the electrical element, so that heat loss is not small.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the mixed heating industrial kiln which adopts different heating modes according to the temperature interval of the industrial kiln and the production process of materials, utilizes heat energy to the maximum extent, can be matched with the sintering characteristics of the materials better, utilizes the heat energy conversion efficiency to the greater extent, and reduces the production cost.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a hybrid heating's industrial kiln, is including preheating furnace body, heating furnace body, constant temperature furnace body and the cooling furnace body that sets gradually, the heating furnace body is equipped with natural gas burner, the constant temperature furnace body is equipped with electric heater unit, the cooling furnace body passes through waste heat pipeline and preheats the furnace body and is connected.

As a further improvement of the above technical solution:

the natural gas combustion device is a burner, the heating furnace body is divided into an upstream low-temperature area adjacent to the preheating furnace body and a downstream high-temperature area adjacent to the constant-temperature furnace body, at least one pair of burners is arranged at the lower part of the upstream low-temperature area, and the two burners in each pair are respectively arranged on two side walls of the upstream low-temperature area and are distributed in a staggered manner; the burner is characterized in that at least one pair of burners is arranged on the upper portion of the downstream high-temperature area, at least one pair of burners is arranged on the lower portion of the downstream high-temperature area, each pair of burners is arranged on two side walls of the downstream high-temperature area and distributed in a staggered mode, and the upper burners and the lower burners are arranged in a diagonally staggered mode.

And a liftable air passage height adjusting plate is arranged between the upstream low-temperature area and the downstream high-temperature area.

The heating furnace body is provided with a thermocouple, and the thermocouple is positioned on the opposite side face of the burner.

The constant temperature furnace body comprises two thermocouples, the electric heating device comprises two electric heating silicon carbide rods which are arranged up and down, one thermocouple is positioned above the upper electric heating silicon carbide rod, and the other thermocouple is positioned below the lower electric heating silicon carbide rod.

The cooling furnace body includes upper reaches cooling space and low reaches cooling space, be equipped with fire-resistant sleeve pipe on the furnace body furnace inside wall of upper reaches cooling space, fire-resistant sleeve pipe is inclosed hollow tube to be equipped with the cooling air-supply line and cool down out the tuber pipe, cool down out tuber pipe and waste heat pipeline intercommunication, the cooling air-supply line lets in cold wind or air.

The furnace body of low reaches cooling zone includes inner shell and shell, shell and inner shell form hollow forced air cooling and press from both sides the cover, be equipped with in the forced air cooling presss from both sides the cover and divides the baffle of upper air current passageway and lower floor's air current passageway with the forced air cooling, upper air current passageway has an upper air-supply line and an upper air-out pipe, and lower floor's air current passageway has a lower floor's air-supply line and a lower floor's air-out pipe, upper air-supply line and lower floor's air-supply line let in cold wind or air, upper air-out pipe and lower floor's air-out pipe all are linked together.

The upper layer airflow channel and the lower layer airflow channel are internally provided with a plurality of heat insulation air plates, notches are arranged on the heat insulation air plates, an auxiliary airflow channel is formed between each notch and the inner shell or the outer shell, the auxiliary airflow channel in the upper layer airflow channel is communicated with the upper layer airflow channel, and the auxiliary airflow channel in the lower layer airflow channel is communicated with the lower layer airflow channel.

An exhaust fan and a heating box are arranged on the waste heat pipeline; the preheating furnace body and the heating furnace body are respectively provided with an exhaust pipe, and each exhaust pipe is connected with an exhaust fan.

The waste heat pipeline is communicated with a preheating air inlet pipe in a preheating furnace body hearth, and a plurality of upward air inlets are formed in the preheating air inlet pipe.

Compared with the prior art, the invention has the advantages that:

(1) according to the mixed heating industrial kiln, the preheating zone adopts heat collected by the cooling zone to dry the product, the heating and heating zone adopts natural gas to heat, the production characteristics of the product are fully utilized, and the requirements on the temperature and the atmosphere are relatively low in the temperature section; the natural gas heating cost is low, and the main product after combustion is water, so that the natural gas heating device has no pollution to the environment; electric heating is adopted in a constant temperature area; different heating modes are adopted according to the temperature interval of the industrial kiln and the production process of the materials, so that heat energy is utilized to the maximum extent, the sintering characteristics of the materials can be matched, the heat energy conversion efficiency is utilized to the greater extent, and the production cost is reduced.

(2) According to the mixed heating industrial kiln disclosed by the invention, the exhaust devices for exhausting the waste gas and the moisture are arranged in the preheating zone and the heating zone of the industrial kiln, so that the moisture and the waste gas generated by burning natural gas can be exhausted out of a hearth along with wastes generated by sintering products, and the performance of the products cannot be influenced.

(3) The burners of the heating zone of the mixed heating industrial kiln are arranged in a staggered manner, so that the mixed heating industrial kiln is beneficial to full combustion of natural gas. An air passage height adjusting plate is arranged between different temperatures of the heating area, an air passage of combustion-supporting gas can be adjusted, the quantity of the combustion-supporting gas of each temperature section is controlled, and natural gas is fully combusted.

(4) According to the mixed heating industrial kiln, the cooling area is divided into the non-heating jacket cooling area and the atmospheric air cooling area, the inner side of the furnace body refractory material of the non-heating jacket cooling area is provided with the hollow-structure refractory casing, and hot air can flow in the casing; in the atmospheric air cooling area, air flows away in a labyrinth manner in the auxiliary air flow channel, so that the heat dissipation time and the heat dissipation area are increased.

Drawings

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a schematic view of the preheating furnace body in the present invention.

FIG. 3 is a schematic view of the structure of the heating furnace body of the present invention.

FIG. 4 is a schematic structural view of the constant temperature furnace body of the present invention.

FIG. 5 is a schematic structural view of an upstream cooling zone of the temperature-reducing furnace body according to the present invention.

FIG. 6 is a schematic structural diagram of a downstream cooling zone of the temperature-reducing furnace body according to the present invention.

Fig. 7 is a schematic structural view of an insulating wind plate according to the present invention.

FIG. 8 is a schematic view of another embodiment of the present invention.

The reference numerals in the figures denote:

100. preheating a furnace body; 110. preheating an air inlet pipe; 200. heating the furnace body; 201. burning a nozzle; 202. an airway height adjustment plate; 210. an upstream low temperature zone; 220. a downstream high temperature zone; 300. a constant temperature furnace body; 301. electrically heating the silicon carbide rod; 400. cooling the furnace body; 401. a refractory casing; 402. a cooling air inlet pipe; 403. cooling the air outlet pipe; 405. a heat-insulating wind plate; 406. a notch; 410. an upstream cooling zone; 420. a downstream cooling zone; 421. an inner shell; 422. a housing; 423. an upper layer airflow channel; 424. a lower layer airflow channel; 425. a partition plate; 426. an upper air outlet pipe; 427. a lower air outlet pipe; 428. an auxiliary air flow path; 500. a waste heat pipeline; 510. an exhaust fan; 520. a heating box; 530. adjusting a valve; 600. a thermocouple; 700. an exhaust pipe; 710. an exhaust fan; 800. sagger bearing device.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

As shown in fig. 1, the hybrid heating industrial kiln of the embodiment includes a preheating furnace body 100, a heating furnace body 200, a constant temperature furnace body 300 and a cooling furnace body 400, which are sequentially arranged, wherein the heating furnace body 200 is provided with a natural gas combustion device, the constant temperature furnace body 300 is provided with an electric heating device, and the cooling furnace body 400 is connected with the preheating furnace body 100 through a waste heat pipeline 500.

The industrial kiln is divided into a preheating area, a heating and warming area, a constant temperature area and a cooling area according to the temperature range. The preheating zone is low in temperature, and the materials are dried by adopting the heat collected by the cooling zone, so that the moisture in the raw materials is discharged; the heating temperature-raising area is mainly used for discharging waste gas generated in the sintering process, the temperature control precision and the cleanliness of the atmosphere in the furnace are lower than those of a constant temperature area, natural gas is adopted for heating, and the waste gas and moisture generated by the combustion of the natural gas are discharged out of the hearth along with an exhaust device; the constant temperature area is mainly used for sintering products, the requirement on the uniformity of the temperature in the furnace is high, the requirements on the uniformity and cleanliness of the atmosphere in the furnace are high, and electric heating is adopted; the cooling area is mainly used for reducing the temperature of the product, and the temperature is reduced from the sintering temperature to the low temperature required to be met in the subsequent process, so that a large amount of heat loss is brought in the process, and the heat energy dissipated by the product in the cooling process is collected and used for drying the material, so that a large amount of heat energy can be saved, the heat dissipation to the external environment is reduced, and the environment is protected; the gas and electricity mixed heating mode is adopted, different heating modes are adopted according to the temperatures of different sintering areas and the sintering characteristics of materials, heat energy is fully utilized, and the cost is saved.

In this embodiment, the waste heat pipeline 500 is connected to the cooling zone and the preheating zone and is used for transmitting hot air of the cooling zone to the preheating zone, the waste heat pipeline 500 is provided with the exhaust fan 510, the heating box 520 and the regulating valve 530, the heating box 520 can heat the hot air transmitted by the cooling zone, supplement heat, improve the temperature of the waste heat and the temperature of the preheating zone, and the regulating valve 530 can regulate the amount of the hot air and the temperature of each temperature zone; preheating furnace body 100 and heating furnace body 200 all are equipped with blast pipe 700, and each blast pipe 700 all is connected with exhaust fan 710, and moisture and waste gas that the natural gas burning produced can discharge furnace along with the discarded object that the product sintering produced together, can not exert an influence to the performance of product.

In this embodiment, as shown in fig. 2, the preheating furnace body 100 mainly includes a furnace shell, a refractory material, a sagger carrying device 800, an exhaust pipe 700 and a preheating intake pipe 110, wherein the sagger carrying device 800 is used for carrying saggers, and may be a fixed carrying beam (the saggers are pushed forward by a pushing plate) or a moving roller table (the saggers are pushed forward by a roller rod). Blast pipe 700 is located the stove outer covering top, preheats intake pipe 110 and is located the furnace bottom, and waste heat pipeline 500 with preheat intake pipe 110 intercommunication are equipped with a plurality of inlet ports up on preheating intake pipe 110, and the steam that lets in the pipe is from up moving down, and with the abundant contact of material, the stoving material.

In this embodiment, as shown in fig. 3, the heating furnace body 200 mainly includes a furnace shell, a refractory material, a sagger carrying device 800 (same as above), and an exhaust pipe 700, where the exhaust pipe 700 is located at the top, and the natural gas combustion device is a burner 201. The heating furnace body 200 is divided into an upstream low-temperature area 210 adjacent to the preheating furnace body 100 and a downstream high-temperature area 220 adjacent to the constant-temperature furnace body 300, a pair of burners 201 is arranged at the lower part of the upstream low-temperature area 210, and two burners 201 in each pair are respectively arranged on two side walls of the upstream low-temperature area 210 and distributed in a staggered manner; the upper part of the downstream high-temperature area 220 is provided with a pair of burners 201, the lower part of the downstream high-temperature area 220 is provided with a pair of burners 201, each pair of burners 201 are respectively arranged on two side walls of the downstream high-temperature area 220 and distributed in a staggered manner, and the upper burners 201 and the lower burners 201 are arranged in a diagonally staggered manner.

That is, only one burner 201 is arranged at the upper part and the lower part of the same side of the sagger bearing device 800, only one burner is arranged at the two opposite sides of the upper part and the lower part of the sagger bearing device 800, the sagger bearing device is arranged in an X-shaped diagonal manner, the staggered arrangement of the burners 201 is beneficial to full combustion of natural gas, the waste of the natural gas is reduced, the atmosphere pollution in a hearth can be reduced, and the influence on the uniformity of the temperature in the furnace is reduced. The number of pairs of burners 201 is related to the length of the furnace body 200, and the longer the furnace body, the more pairs are provided.

In this embodiment, a liftable airway height adjusting plate 202 is disposed between the upstream low temperature region 210 and the downstream high temperature region 220. The adjusting plate 202 can adjust up and down, controls the air passage for the circulation of combustion-supporting gas, and controls the amount of combustion-supporting gas in the high-temperature region and the low-temperature region, so that natural gas is sufficiently combusted, when the temperature in the downstream high-temperature region 220 is high (reaches a required temperature value), the air passage height adjusting plate 202 rises to increase the circulation of gas, so that hot gas can enter the upstream low-temperature region 210, so that the combustion of the upstream low-temperature region 210 is reduced, when the temperature in the downstream high-temperature region 220 is low, the air passage height adjusting plate 202 descends to reduce the circulation of gas, so that the hot gas is reduced to enter the upstream low-temperature region 210, and.

The burner 201 is arranged below the saggar bearing device 120 of the upstream low-temperature zone 210, the air passage height adjusting plate is adjusted, and the heat of the downstream high-temperature zone 220 is transferred to the upstream low-temperature zone 210 by using the airflow pressure in the furnace, so that the temperature requirement of the upstream low-temperature zone 210 is met.

In this embodiment, the heating furnace body 200 is further provided with a thermocouple 600, the thermocouple 600 is located on the opposite side of the burner 201, and may be directly opposite to the burner 201, or may be located between two burners 201, and the thermocouple 600 may detect the outer flame of gas combustion, and measure the temperature accurately.

In this embodiment, as shown in fig. 4, the constant temperature furnace body 300 mainly includes a furnace shell, a refractory material, a sagger holding device 800 and an electric heating device. The electric heating device is two electric heating silicon carbide rods 301 which are arranged up and down, the constant temperature furnace body 300 further comprises two thermocouples 600, one thermocouple 600 is positioned above the upper electric heating silicon carbide rod 301, and the other thermocouple 600 is positioned below the lower electric heating silicon carbide rod 301. In addition to this embodiment, the thermocouple 600 may be heated between two electrically heated silicon carbide rods 301.

In this embodiment, the cooling furnace body 400 is divided into two structures of the non-heating jacket air draft cooling and the atmospheric air cooling according to the difference of the temperature, and the cooling speed of the two structures is different, and the used temperature regions are different and are cooled step by step. The non-heating jacket induced draft cooling is the upstream cooling zone 410 and the atmospheric air cooling is the downstream cooling zone 420. As shown in fig. 5, the furnace body of the upstream cooling zone 410 includes a furnace shell, a refractory material and a saggar carrying device 800, a refractory casing 401 is disposed on the inner side wall of the furnace, the refractory casing 401 is a closed hollow pipe and is provided with a cooling air inlet pipe (not shown) and a cooling air outlet pipe 403, and cold air or air is introduced into the cooling air inlet pipe. Refractory casing 401 is located the top that the saggar bore device 120, and cooling air can take away heat in the furnace in the inside flow of refractory casing 401, reduces material temperature, and cooling tuber pipe 403 communicates with waste heat pipeline 500, with the hot-blast transmission in the refractory casing 401 to waste heat pipeline 500 in. The fire-resistant sleeve 401 is located in the hearth heat-insulating material and surrounds two sides of the hearth, one end of the fire-resistant sleeve is connected with the cooling air inlet pipe, the other end of the fire-resistant sleeve is connected with the cooling air outlet pipe 403, the fire-resistant sleeve 401 can bear high temperature, cold air moves in the fire-resistant sleeve 401 to take away heat, the temperature of a product can be reduced in a high-temperature environment, and the situation that the product performance is affected due to the fact that the cold air or air directly cools the. After the product is cooled to a certain temperature by air cooling without a heating jacket, the product is cooled by atmospheric air cooling, and the temperature of the product is reduced.

As shown in fig. 6, the furnace body of the downstream cooling zone 420 includes an inner shell 421, an outer shell 422 and a saggar carrying device 800, the outer shell 422 and the inner shell 421 form a hollow air-cooling jacket, a partition 425 is arranged in the air-cooling jacket to divide the air-cooling jacket into an upper airflow channel 423 and a lower airflow channel 424, the upper airflow channel 423 has an upper air inlet pipe (not shown) and an upper air outlet pipe 426, the lower airflow channel 424 has a lower air inlet pipe (not shown) and a lower air outlet pipe 427, the upper air inlet pipe and the lower air inlet pipe are filled with cold air or air, and the upper air outlet pipe 426 and the lower air outlet pipe 427 are both communicated with the waste heat pipeline 500. The furnace shell and the inner shell form an air cooling jacket, external air is introduced into the air cooling jacket to flow, heat is taken away, materials are cooled, a partition plate is arranged in the air cooling jacket, the air cooling jacket is divided into an upper layer and a lower layer, the air flows in the upper layer and the lower layer in the jacket, and air is independently fed and discharged between the upper layer and the lower layer.

In this embodiment, a plurality of insulating wind plates 405 are disposed in the upper layer airflow channel 423 and the lower layer airflow channel 424, a notch 406 is disposed on each insulating wind plate 405, an auxiliary airflow channel 428 is formed between each notch 406 and the partition 425 or the inner shell 421 or the outer shell 422, the auxiliary airflow channel 428 disposed in the upper layer airflow channel 423 is communicated with the upper layer airflow channel 423, and the auxiliary airflow channel 428 disposed in the lower layer airflow channel 424 is communicated with the lower layer airflow channel 424. The notches 406 on different heat insulation wind boards 405 are different, the heat insulation wind boards 405, the outer shell 422, the inner shell 421 and the partition 425 form a unique circulating air channel through the notches 406, the atmosphere can only flow along one path in the air cooling jacket, so that the atmosphere is fully contacted with the inner shell 421, the heat dissipation area is increased, the heat dissipation effect is improved, and the cooling effect is improved, namely an auxiliary air channel 428 is formed between the notches 406 and the partition 425 or the inner shell 421 or the outer shell 422, only one inlet and one outlet are provided, and the air flows away in the auxiliary air channel 428 in a labyrinth manner, so that the heat dissipation time and the heat dissipation area are increased. The insulating air panels 405 are typically provided in pairs.

In fig. 7, a part a is an insulating wind plate 405, the notches 406 of the insulating wind plate 405 are arranged at two ends, and an auxiliary air flow channel 428 (part b in fig. 7) is formed between the notches 406 of the two insulating wind plates 405.

In fig. 8, the portion c is another insulating air plate 405, the slot 406 of the insulating air plate 405 is located in the middle, an auxiliary air flow channel 428 is formed between the slot 406 of one insulating air plate 405 and the outer shell 422, an auxiliary air flow channel 428 (portion d in fig. 8) is also formed between the slot 406 of the other insulating air plate 405 and the inner shell 421, and the auxiliary air flow channels 428 are communicated with each other.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. The utility model provides a hybrid heating's industrial kiln, is including preheating furnace body (100), heating furnace body (200), constant temperature furnace body (300) and cooling furnace body (400) that set gradually, its characterized in that: the heating furnace body (200) is provided with a natural gas combustion device, the constant-temperature furnace body (300) is provided with an electric heating device, the cooling furnace body (400) is connected with the preheating furnace body (100) through a waste heat pipeline (500), the natural gas combustion device is a burner (201), the heating furnace body (200) is divided into an upstream low-temperature region (210) adjacent to the preheating furnace body (100) and a downstream high-temperature region (220) adjacent to the constant-temperature furnace body (300), the lower part of the upstream low-temperature region (210) is provided with at least one pair of burners (201), and each pair of two burners (201) are respectively arranged on two side walls of the upstream low-temperature region (210) and are distributed in a staggered manner; the upper part of the downstream high-temperature area (220) is provided with at least one pair of burners (201), the lower part of the downstream high-temperature area (220) is provided with at least one pair of burners (201), each pair of burners (201) are respectively arranged on two side walls of the downstream high-temperature area (220) and are distributed in a staggered manner, the upper burners (201) and the lower burners (201) are arranged in a diagonally staggered manner, a liftable air passage height adjusting plate (202) is arranged between the upstream low-temperature area (210) and the downstream high-temperature area (220), when the temperature in the downstream high-temperature area (220) is higher, the air passage height adjusting plate (202) rises to increase the gas circulation, so that hot gas can enter the upstream low-temperature area (210) to reduce the combustion of the upstream low-temperature area (210), and when the temperature in the downstream high-temperature area (220) is lower, the air passage height adjusting plate (202) descends to reduce, the temperature of the downstream high-temperature area (220) can be rapidly raised, the air passage height adjusting plate (202) is adjusted, and the heat of the downstream high-temperature area (220) is transferred to the upstream low-temperature area (210) by using the air flow pressure in the furnace, so that the temperature requirement of the upstream low-temperature area (210) is met.

2. The hybrid heated industrial kiln of claim 1, wherein: the heating furnace body (200) is provided with a thermocouple (600), and the thermocouple (600) is located on the opposite side of the burner (201).

3. Hybrid-heated industrial kiln according to claim 1 or 2, characterized in that: the constant temperature furnace body (300) comprises two thermocouples (600), the electric heating devices are two electric heating silicon carbide rods (301) which are arranged up and down, one thermocouple (600) is positioned above the upper electric heating silicon carbide rod (301), and the other thermocouple (600) is positioned below the lower electric heating silicon carbide rod (301).

4. Hybrid-heated industrial kiln according to claim 1 or 2, characterized in that: cooling furnace body (400) are including upper reaches cooling space (410) and low reaches cooling space (420), be equipped with fire-resistant sleeve pipe (401) on the furnace body furnace inside wall of upper reaches cooling space (410), fire-resistant sleeve pipe (401) are inclosed hollow tube to be equipped with cooling air-supply line (402) and cooling air-out pipe (403), cooling air-out pipe (403) and waste heat pipeline (500) intercommunication, the cooling air-supply line lets in cold wind or air.

5. The hybrid heated industrial kiln of claim 4, wherein: the furnace body of low reaches cooling zone (420) includes inner shell (421) and shell (422), shell (422) and inner shell (421) form hollow forced air cooling and press from both sides the cover, be equipped with in the forced air cooling and press from both sides the cover and divide into upper air flow channel (423) and baffle (425) of lower floor air flow channel (424) with the forced air cooling, upper air flow channel (423) have an upper air-supply line and an upper air-out pipe (426), lower floor air flow channel (424) have a lower floor air-supply line and a lower floor air-out pipe (427), upper air-supply line and lower floor air-supply line let in cold wind or air, upper air-out pipe (426) and lower floor air-out pipe (427) all are linked together with waste heat pipeline (500).

6. The hybrid heated industrial kiln of claim 5, wherein: a plurality of heat insulation air plates (405) are arranged in the upper layer air flow channel (423) and the lower layer air flow channel (424), notches (406) are arranged on the heat insulation air plates (405), an auxiliary air flow channel (428) is formed between each notch (406) and the inner shell (421) or the outer shell (422), the auxiliary air flow channel (428) in the upper layer air flow channel (423) is communicated with the upper layer air flow channel (423), and the auxiliary air flow channel (428) in the lower layer air flow channel (424) is communicated with the lower layer air flow channel (424).

7. Hybrid-heated industrial kiln according to claim 1 or 2, characterized in that: an exhaust fan (510) and a heating box (520) are arranged on the waste heat pipeline (500); the preheating furnace body (100) and the heating furnace body (200) are both provided with exhaust pipes (700), and each exhaust pipe (700) is connected with an exhaust fan (710).

8. Hybrid-heated industrial kiln according to claim 1 or 2, characterized in that: the waste heat pipeline (500) is communicated with a preheating air inlet pipe (110) in a hearth of the preheating furnace body (100), and a plurality of upward air inlet holes are formed in the preheating air inlet pipe (110).