阅读说明：本技术 一种微波、燃气混合加热辊道窑 (Microwave and gas mixed heating roller kiln ) 是由 潘建环 陈水福 肖峰 于 2019-12-18 设计创作，主要内容包括：本发明公开了一种微波、燃气混合加热辊道窑,其辊道窑本体包括依次连接的第一加热段、第二加热段；其中,所述第一加热段内设有燃气加热装置,所述第二加热段内设有微波加热装置。本发明的微波、燃气混合加热辊道窑,通过在第一加热段内设置燃气加热装置,在第二加热段内设置微波加热装置；当产品通过第一加热段时,第一加热段内使产品外表面被热空气加热得以升温,进而产品通过第二加热段,由微波加热装置发出的微波使产品的内部得以快速升温；通过结合燃气加热和微波加热两种方式,既保留了燃气单位热值成本低和微波穿透性强的优点,又相对克服了各自存在的缺点,从而大幅缩短了产品的烧成周期,进一步提高了单位时间内的产量。(The invention discloses a microwave and gas mixed heating roller kiln, wherein a roller kiln body comprises a first heating section and a second heating section which are sequentially connected; wherein, be equipped with gas heating device in the first heating section, be equipped with microwave heating device in the second heating section. According to the microwave and gas mixed heating roller kiln, the gas heating device is arranged in the first heating section, and the microwave heating device is arranged in the second heating section; when the product passes through the first heating section, the outer surface of the product is heated by hot air in the first heating section to be heated, and then the product passes through the second heating section, and the microwave emitted by the microwave heating device quickly heats the interior of the product; by combining two modes of gas heating and microwave heating, the advantages of low unit calorific value cost of gas and strong microwave penetrability are kept, and the respective defects are overcome, so that the firing period of the product is greatly shortened, and the yield in unit time is further improved.)

1. The utility model provides a microwave, gas hybrid heating roller kilns which characterized in that includes:

a roller kiln body;

the roller kiln body comprises a first heating section and a second heating section which are connected in sequence;

wherein, be equipped with gas heating device in the first heating section, be equipped with microwave heating device in the second heating section.

2. The microwave and gas mixing heating roller kiln according to claim 1, characterized in that:

the distance from the two ends of the second heating section to the microwave heating device is larger than the distance required by the microwave emitted by the microwave heating device to be attenuated to a safety value.

3. The microwave and gas mixing heating roller kiln according to claim 1, characterized in that:

and the inner wall of the second heating section is provided with a microwave shielding material.

4. The microwave and gas hybrid heating roller kiln according to claim 1, further comprising:

a flue gas waste heat recovery device;

the flue gas waste heat recovery device comprises a first air pipe connected to the first heating section and a fan used for pumping flue gas of the first heating section to the first air pipe.

5. The microwave and gas mixing heating roller kiln according to claim 4, characterized in that:

the first air pipe is connected to the front end of the first heating section and used for guiding the flue gas in the first heating section to flow in the direction far away from the second heating section.

6. The microwave and gas mixing heating roller kiln according to claim 5, characterized in that:

the roller kiln body also comprises a heat preservation section, and a gas heating device is arranged in the heat preservation section;

the first heating section, the second heating section and the heat preservation section are connected in sequence.

7. The microwave and gas mixing heating roller kiln according to claim 6, characterized in that:

the flue gas waste heat recovery device also comprises a second air pipe, and two ends of the second air pipe are respectively connected with the heat preservation section and the fan;

and the second air pipe is connected to the rear end of the heat preservation section and used for guiding the flue gas in the heat preservation section to flow in the direction far away from the second heating section.

8. The microwave and gas hybrid heating roller kiln according to claim 1, further comprising:

a combustion-supporting air device;

and a heat exchanger is connected between the combustion-supporting air device and the flue gas waste heat recovery system.

9. The microwave and gas hybrid heating roller kiln according to claim 1, comprising:

the roller kiln body also comprises a cooling section, the cooling section is connected with a cooling air device, and the cooling air device is used for generating low-temperature or normal-temperature air flow and blowing the air flow into the cooling section;

the first heating section, the second heating section, the heat preservation section and the cooling section are connected in sequence.

10. The microwave, gas-fired hybrid heating roller kilns according to any one of claims 1 to 9, including, further comprising:

and the roller rod conveying device is arranged in the roller kiln body.

Technical Field

The invention relates to the technical field of heating equipment, in particular to a microwave and gas mixed heating roller kiln.

Background

The roller kiln is mainly used for firing ceramic products such as ceramic tiles, house external wall tiles, internal wall tiles, floor tiles and the like; roller kilns use rotating rollers as blank carriers, ceramic products are placed on a plurality of rollers with very close intervals, and the rotation of the rollers is used for conveying the ceramic from the kiln head to the kiln tail, so the roller kilns are called as roller kilns.

When a product is heated by a traditional gas roller kiln, ambient air is heated by gas, and then the product is heated by the ambient air; in the heating process, the surface of the product is directly contacted with hot air, and the heat in the product is completely conducted through the surface of the product; thus, the temperature rise inside the product is much slower than at the surface of the product.

When a product with large volume and thickness is heated and the thermal conductivity of the heated product is not good, the heating inside the product to the required set temperature needs longer time, so that the sintering cycle time of the product is prolonged, and the yield is reduced.

Disclosure of Invention

The invention aims to provide a microwave and gas mixed heating roller kiln, which can further shorten the firing period of products and improve the yield even when heating products with large volume and thickness or heating products with poor heat conductivity.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a microwave and gas mixed heating roller kiln comprises:

a roller kiln body;

the roller kiln body comprises a first heating section and a second heating section which are connected in sequence;

wherein, be equipped with gas heating device in the first heating section, be equipped with microwave heating device in the second heating section.

According to the microwave and gas mixed heating roller kiln, a heating section in a roller kiln body is divided into a first heating section and a second heating section which are connected in sequence, a gas heating device is arranged in the first heating section, and a microwave heating device is arranged in the second heating section; when the product gets into roller kilns body back earlier through first heating section, the air that is heated by gas heating device makes the product surface heat up in the first heating section, and then the product passes through the second heating section, and the microwave that sends by microwave heating device makes the inside of product heat up fast. The invention combines the gas heating mode and the microwave heating mode, not only retains the advantages of low unit heat value cost of gas and strong microwave penetrability, but also relatively overcomes the respective defects, thereby greatly shortening the sintering period of products and further improving the yield in unit time.

Further, the distance from the two ends of the second heating section to the microwave heating device is larger than the distance required by the microwave emitted by the microwave heating device to be attenuated to a safety value.

The distance between the two ends of the second heating section and the microwave heating device is larger than the distance required by the microwave emitted by the microwave heating device to be attenuated to a safety value, so that an account for shielding the microwave is not required to be arranged between the first heating section and the second heating section, and the safety of operators can be ensured.

Further, the inner wall of the second heating section is provided with a microwave shielding material.

Further, the microwave and gas mixed heating roller kiln also comprises a flue gas waste heat recovery device;

the flue gas waste heat recovery device comprises a first air pipe connected to the first heating section and a fan used for pumping flue gas of the first heating section to the first air pipe.

Further, the first air pipe is connected to the front end of the first heating section and used for guiding the flue gas in the first heating section to flow in the direction far away from the second heating section.

According to the microwave heating device, the first air pipe is connected to the front end of the first heating section, so that the flue gas in the first heating section flows to the front end of the first heating section, namely to the direction far away from the second heating section, and the flue gas generated by heating the fuel gas is prevented from excessively flowing into the second heating section to damage the microwave heating device.

Furthermore, the roller kiln body also comprises a heat preservation section, and a gas heating device is arranged in the heat preservation section;

the first heating section, the second heating section and the heat preservation section are connected in sequence.

Furthermore, the flue gas waste heat recovery device also comprises a second air pipe, and two ends of the second air pipe are respectively connected with the heat preservation section and the fan;

and the second air pipe is connected to the rear end of the heat preservation section and used for guiding the flue gas in the heat preservation section to flow in the direction far away from the second heating section.

As a specific implementation mode, the microwave and gas mixed heating roller kiln further comprises a combustion-supporting air device;

the combustion-supporting air device is connected with the flue gas waste heat recovery system through a heat exchanger, and waste heat is carried out on the combustion-supporting air device by utilizing heat in the flue gas waste heat recovery system through the heat exchanger.

As a specific implementation mode, the roller kiln body further comprises a cooling section, the cooling section is connected with a cooling air device, and the cooling air device is used for generating low-temperature or normal-temperature air flow and blowing the air flow into the cooling section;

the first heating section, the second heating section, the heat preservation section and the cooling section are connected in sequence.

As a specific implementation mode, the microwave and gas mixed heating roller kiln further comprises a roller rod conveying device arranged in the roller kiln body.

For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a front part of a microwave and gas hybrid heating roller kiln according to an embodiment of the invention;

FIG. 2 is a cross-sectional view of the second heating section of the microwave and gas hybrid heating roller kiln according to the embodiment of the invention;

fig. 3 is a schematic structural diagram of a rear part of the microwave and gas mixed heating roller kiln according to the embodiment of the invention.

Detailed Description

In order to better illustrate the invention, the invention is described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, a roller kiln heated by microwave and gas mixture comprises:

a roller kiln body 100;

the roller kiln body 100 comprises a first heating section 110 and a second heating section 120 which are connected in sequence;

wherein, a gas heating device is arranged in the first heating section 110, and a microwave heating device is arranged in the second heating section 120.

It should be noted that, without affecting understanding, the specific structural schematic diagrams of the gas heating device and the microwave heating device are not shown in the drawings.

Specifically, the microwave and gas mixed heating roller kiln further comprises a roller rod conveying device 200 arranged in the roller kiln body 100.

The structure of the gas heating device is basically the same as that of the prior art, the combustion chamber of the gas heating device is arranged below the roller rod conveying device, and fuels such as natural gas, heavy oil, diesel oil and the like are atomized by compressed air and are combusted to generate high temperature, so that the air in the first heating section is heated; and the fire-resistant material is used for isolating the combustion chamber from the roller rod, so that the flame does not directly contact the fired product.

As shown in fig. 2, the microwave heating apparatus includes a microwave generating source assembly 300; preferably, the microwave generating source assembly 300 is disposed on the top of the second heating section 120 to emit microwaves toward the product passing through the second heating section 120 from the top down.

Preferably, the inner wall of the second heating section 120 is provided with a microwave shielding material 400 to prevent the microwave from leaking from the side wall and the top of the roller kiln body.

Preferably, the roller conveyor at the bottom of the second heating section has both ends of each roller enclosed in a metal enclosure to prevent the microwaves from leaking out of the roller conveyor.

In the microwave and gas mixed heating roller kiln of the embodiment, the heating section in the roller kiln body is divided into a first heating section and a second heating section which are connected in sequence, a gas heating device is arranged in the first heating section, and a microwave heating device is arranged in the second heating section; when the product gets into roller kilns body back earlier through first heating section, the air that is heated by gas heating device makes the product surface heat up in the first heating section, and then the product passes through the second heating section, and the microwave that sends by microwave heating device makes the inside of product heat up fast. The invention combines the gas heating mode and the microwave heating mode, not only retains the advantages of low unit heat value cost of gas and strong microwave penetrability, but also relatively overcomes the respective defects, thereby greatly shortening the sintering period of products and further improving the yield in unit time.

Preferably, the distance between the two ends of the second heating section 120 and the microwave heating device is greater than the distance required for the microwave emitted by the microwave heating device to be attenuated to a safe value.

The distance from the two ends of the second heating section to the microwave heating device is larger than the distance required by the microwave attenuation to the safety value, so that an account for shielding the microwave is not required to be arranged between the first heating section and the second heating section, and the safety of operators can be guaranteed.

Because the tent does not need to be arranged between the first heating section and the second heating section, the temperature difference between the first heating section and the second heating section is not too large, and the outer surface of the product is not cooled by the air in the second heating section after the product enters the second heating section from the first heating section.

Preferably, the microwave and gas mixed heating roller kiln further comprises a flue gas waste heat recovery device 500;

the flue gas waste heat recovery device 500 comprises a first air duct 510 connected to the first heating section 110, and a fan 530 for drawing the flue gas of the first heating section 110 to the first air duct 510.

This embodiment is through connecting first tuber pipe at the front end of first heating section to make the flue gas in the first heating section to the front end of first heating section, the direction that also keeps away from the second heating section flows, thereby avoid the flue gas that the gas heating produced to gush into the second heating section too much, cause the damage to microwave heating device.

Preferably, the roller kiln body 100 further comprises a heat preservation section 130, and a gas heating device is arranged in the heat preservation section 130;

the first heating section 110, the second heating section 120 and the heat preservation section 130 are connected in sequence.

It should be noted that the heat-retaining section is the same as the first heating section, except that the heating power of the gas heating device is slightly lower than that of the gas heating device in the first heating section.

Preferably, the flue gas waste heat recovery device 500 further includes a second air duct 520, two ends of which are respectively connected to the heat preservation section 130 and the blower 530;

wherein the second air duct 520 is connected to the rear end of the heat-insulating section 130, and is used for guiding the flue gas in the heat-insulating section 130 to flow in the direction away from the second heating section 120.

Specifically, the microwave and gas mixed heating roller kiln further comprises a combustion-supporting air device 600, wherein the combustion-supporting air device 600 is used for providing combustion-supporting air for the gas heating devices at the bottoms of the first heating section 110 and the heat preservation section 130;

the combustion-supporting air device 600 is connected with the flue gas waste heat recovery device 500 through a heat exchanger 700, and waste heat is carried out on the combustion-supporting air device by utilizing heat in the flue gas waste heat recovery system through the heat exchanger.

Specifically, the roller kiln body further comprises a cooling section, the cooling section is connected with a cooling air device 600, and the cooling air device 600 is used for generating low-temperature or normal-temperature air flow and blowing the air flow into the cooling section;

the first heating section 110, the second heating section 120, the heat preservation section 130 and the cooling section are connected in sequence.

Specifically, the cooling sections include a rapid cooling section 140 and a slow cooling section 150, and both the rapid cooling section 140 and the slow cooling section 150 are supplied with cold air by the cooling air device 800, which is different in that the air speed of the cooling air device at the air outlet of the rapid cooling section is different from the air speed of the cooling air device at the air outlet of the slow cooling section, or the temperature of the cold air supplied to the rapid cooling section and the slow cooling section is different.

In this embodiment, the first heating section 110, the second heating section 120, the heat-retaining section 130, the rapid cooling section 140, and the slow cooling section 150 are connected by conductive sealing rings; in addition, each section can be connected by using conductive silica gel, conductive graphite packing and the like.

In addition, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the use of "first" and "second" is merely for convenience in describing the invention and to simplify the description, and unless otherwise stated the above words are not intended to have a special meaning.

The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.