CN111536793A - Roller kiln with double-layer smoke exhaust channel structure - Google Patents

Abstract

The invention relates to a roller kiln with a double-layer smoke exhaust channel structure, which comprises a kiln body in a firing section, a kiln body in an oxidation section, and a kiln body in a smoke exhaust section. The smoke exhaust air duct is connected to the main smoke exhaust air duct through the first smoke exhaust fan, and the smoke exhaust main air duct is connected to the drying kiln. There are several flue gas inlets spaced through the baffle, the upper layer smoke exhaust channel is connected with the lower layer smoke exhaust channel through the flue gas inlet, the upper layer smoke exhaust channel is communicated with the smoke exhaust section kiln body, the The end of the smoke exhaust channel on the lower layer is provided with an auxiliary smoke exhaust air duct, and the other end of the auxiliary smoke exhaust air duct passes through the flue gas heat exchanger installed on the steel structure platform and passes through the second smoke exhaust fan installed on the steel structure platform. The main exhaust air duct is connected.

Description

Roller kiln with double-layer smoke exhaust channel structure

technical field

The invention relates to the technical field of architectural ceramic kilns, in particular to a roller kiln with a double-layer smoke exhaust channel structure.

Background technique

With the continuous pursuit of large production capacity and low cost in the building ceramics industry, the length of firing kilns has been continuously increased, and kilns with a length of 500 to 600 meters have been put into production and application. As the length of the kiln increases, the distance from the preheating smoke exhaust section of the kiln head to the firing section also increases. During the ceramic firing process, a large amount of high-temperature flue gas will be generated in the high-temperature firing section of the kiln, which requires The smoke is exhausted by the exhaust fan in the preheating exhaust section. The longer the distance is, the greater the resistance to exhaust. The exhaust fan can only extract the flue gas by increasing the pulling force, resulting in an increase in the negative pressure in the exhaust section of the kiln head. , the flow rate of flue gas in the kiln increases, which is not conducive to the adjustment and maintenance of the firing atmosphere and pressure in the kiln, and has an adverse effect on the firing of bricks. With the lengthening of the kiln, the energy consumption per kilogram of porcelain does not drop but rises.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a roller kiln with a double-layer smoke exhaust channel structure that solves the problem of increasing energy consumption of the kiln as the kiln is lengthened.

The technical solution of the present invention is: a roller kiln with a double-layer smoke exhaust channel structure, including a kiln body in a firing section, a kiln body in an oxidation section, and a kiln body in a smoke exhaust section. The exhaust air duct is connected to the main exhaust air duct through the first exhaust fan, and the main exhaust air duct is connected to the drying kiln. The special feature is that the inside of the kiln body in the oxidation section is The smoke exhaust channel is divided into upper and lower layers by a partition plate, the partition plate is provided with a number of smoke inlets at intervals, the upper layer smoke exhaust channel and the lower layer smoke exhaust channel are communicated through the smoke inlet, and the upper layer smoke exhaust channel The passage is communicated with the kiln body of the smoke exhaust section, the end of the lower smoke exhaust passage is provided with an auxiliary smoke exhaust air duct, and the other end of the auxiliary smoke exhaust air duct passes through the flue gas heat exchanger installed on the steel structure platform and then passes through the installation. On the steel structure platform, the second smoke exhaust fan is connected with the main exhaust air pipe.

Preferably: the flue gas heat exchanger is also provided with a heat exchange regulating fan connected to the auxiliary flue gas exhaust duct, and the auxiliary flue gas exhaust duct is located at the inlet and outlet of the flue gas heat exchanger with thermometers respectively. .

Preferably: the flue gas heat exchanger is also connected with a heat exchange air outlet pipe, the other end of the heat exchange air outlet pipe is connected with the combustion air main pipe through the combustion-supporting fan, and the combustion-supporting air main pipe is connected with several combustion-supporting air branch pipes .

Preferably, a combustion-supporting air heating air duct is also connected between the combustion-supporting air branch pipe and the combustion lance connecting pipe, and the combustion-supporting air heating air duct is penetrated in the smoke exhaust passage at the lower layer of the kiln body in the oxidation section.

Preferably, a combustion lance is also fixed on the kiln body wall of the oxidation section, the exhaust port of the combustion lance is located in the upper exhaust passage, and the combustion lance is connected to the combustion lance connecting pipe.

Preferably, the separator is made of refractory material, and the separator is arranged below the roller in the kiln body of the oxidation section.

Compared with the prior art, the beneficial effects of the present invention:

(1) The oxidation section kiln body is divided into upper and lower double-layer smoke exhaust channels by refractory material partitions, and the negative pressure and flue gas flow rate in the large-output and super-long kilns are reduced by the adjustment of the flue gas flow of the double-layer smoke exhaust channels. The extraction distance of the exhaust fan reduces the operating energy consumption of the exhaust fan, which is beneficial to the control and operation of the temperature, atmosphere and pressure system in the kiln;

(2) The heat of the high-temperature flue gas extracted from the newly added auxiliary exhaust flue gas pipe connected to the lower flue gas exhaust channel is used to heat the air in the heat exchange air outlet pipe in the flue gas heat exchanger, and no additional combustion support is required. Wind heating equipment, saving cost and energy consumption;

(3) After the combustion-supporting air used in the combustion lance is heated for one heat exchange with the auxiliary exhaust gas pipe in the flue gas heat exchanger, the secondary heat-exchange heating is carried out in the combustion-supporting air heating air pipe and the lower exhaust passage to further improve the combustion support. The temperature of the air can be reduced, thereby reducing the natural gas consumption of each combustion lance, reducing the energy consumption of the kiln firing, and achieving the purpose of energy saving and consumption reduction.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the roller kiln of the present invention;

Figure 2 is a schematic side view of the kiln body in the oxidation section of the present invention.

Explanation of main component symbols

1 Firing section kiln body 2 oxidation section kiln body 21 Upper floor smoke exhaust channel 22 Lower smoke exhaust channel 221 auxiliary smoke exhaust duct 2211 First Thermometer 2212 Second Thermometer 222 second exhaust fan 23 partitions 231 flue gas inlet 24 combustion gun 25 ceramic rollers 3 smoke exhaust section kiln body 31 smoke exhaust duct 32 The first exhaust fan 4 main exhaust ducts 5 Steel structure platform 51 flue gas heat exchanger 52 heat exchanger regulating fan 61 heat exchange air duct 62 Combustion fan 63 Combustion air supervisor 64 combustion air branch pipe 65 Combustion gun connecting pipe 66 Combustion-supporting air heating duct

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings:

Referring to Figure 1, a roller kiln with a double-layer smoke exhaust channel structure includes a kiln body 1 in a firing section, a kiln body 2 in an oxidation section, and a kiln body 3 in a smoke exhaust section. The smoke exhaust section kiln body 3. Externally connected with a smoke exhaust air duct 31, the smoke exhaust air duct 31 is connected to the smoke exhaust main air duct 4 through the first smoke exhaust fan 32, the smoke exhaust main air duct 4 is connected to the drying kiln, and the oxidation section kiln The smoke exhaust channel inside the body 2 is divided into upper and lower layers by the refractory material partition plate 21 located under the ceramic roller 25. The refractory material partition plate 21 is provided with a number of flue gas inlets 231 at intervals, and the upper layer smoke exhaust channel 21 It is communicated with the lower layer smoke exhaust channel 22 through the flue gas inlet 231, the upper layer smoke exhaust channel 21 is communicated with the smoke exhaust section kiln body 3, and the end of the lower layer smoke exhaust channel 22 is provided with an auxiliary smoke exhaust air duct 221. The other end of the auxiliary smoke exhaust duct 221 passes through the flue gas heat exchanger 51 installed on the steel structure platform 5 and is connected to the main smoke exhaust air duct 4 through the second smoke exhaust fan 222 installed on the steel structure platform 5 .

The auxiliary exhaust air duct 221 is provided with a first thermometer 2211 at the inlet of the flue gas heat exchanger 51, and a second thermometer 2212 is located at the outlet of the flue gas heat exchanger 51. There is a heat exchange regulating fan 52 connected to the auxiliary smoke exhaust duct 221;

The flue gas heat exchanger 51 is also connected with a heat exchange outlet pipe 61 for exporting combustion-supporting air. A number of combustion-supporting air branch pipes 64 are connected to the 63 .

Please refer to FIG. 2 , a combustion lance 24 is also fixed on the wall of the kiln body 2 of the oxidation section. Connected with the combustion spray gun connecting pipe 65, the combustion-supporting air branch pipe 64 is directly connected with the combustion spray gun connecting pipe 65, or connected with the combustion air heating air pipe 66 and then connected with the combustion spray gun connecting pipe 65;

The combustion air heating air duct 66 is penetrated into the lower layer smoke exhaust passage 22 of the oxidation section kiln body 2, and the combustion-supporting gas in the combustion air heating air duct 66 and the flowing high temperature flue gas in the lower smoke exhaust passage 22 undergo a secondary process. The secondary heat exchange temperature rises.

Working principle: the kiln body 1 in the firing section will generate a large amount of high-temperature flue gas during the firing process of the ceramic brick. When the high-temperature flue gas passes through the kiln body 2 in the oxidation section, a part of the high-temperature flue gas enters the kiln body 3 in the exhaust section along the upper smoke exhaust passage 21, and is finally drawn and discharged into the exhaust air duct under the action of the first exhaust fan 32. 31. Finally, it is supplied to the drying kiln through the main exhaust air duct 4;

Another part of the high-temperature flue gas enters the lower smoke exhaust passage 22 through the flue gas inlet 231 , and is drawn and discharged into the auxiliary smoke exhaust air duct 221 under the action of the second smoke exhaust fan 222 . The heat exchange heating is carried out, and the flue gas after heat exchange is collected in the main exhaust air duct 4 and supplied to the drying kiln for use.

After the combustion-supporting air is heated for one heat exchange in the flue gas heat exchanger 51, it is drawn into the heat-exchange outlet duct 61 under the action of the combustion-supporting fan 62, and is supplied to each combustion-supporting air branch pipe 64 through the combustion-supporting air main duct 63, and then enters The combustion-supporting air heating air duct 66 between the combustion-supporting air branch pipe 64 and the combustion lance connecting pipe 65 and the high-temperature flue gas in the lower smoke exhaust passage 22 conduct secondary heat exchange heating, so that the combustion-supporting air temperature of each combustion lance 24 reaches a relatively high temperature. The high temperature is used to support combustion, so that the gas consumption of each combustion lance 24 can be greatly reduced, and the used combustion-supporting air flows to the smoke exhaust section kiln body along with the upper smoke exhaust passage 21 and is discharged;

In the process of heating the combustion air for a heat exchange, the staff adjusts the frequency and air volume of the heat exchange fan 52 of the flue gas heat exchanger 51 according to the temperature values displayed on the first thermometer 2221 and the second thermometer 2222, so as to control the air flow rate. temperature and air volume.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (6)

1. The utility model provides a roll table kiln with double-deck smoke exhaust channel structure, includes the section kiln body of firing, the oxidation section kiln body, the section kiln body of discharging fume, it has the tuber pipe of discharging fume to discharge fume the section kiln external, it is connected with the flue pipe of discharging fume through first smoke exhaust fan to discharge fume the tuber pipe, the flue pipe of discharging fume is connected with dry kiln, a serial communication port, the internal portion's of oxidation section kiln discharge fume channel passes through the baffle and separates two-layer from top to bottom, a plurality of flue gas entry is worn to be equipped with at the interval on the baffle, and upper smoke exhaust channel passes through with lower floor's flue gas entry intercommunication, upper smoke exhaust channel and the section kiln body intercommunication of discharging fume, lower floor's flue gas channel end is equipped with vice smoke exhaust pipe, vice smoke exhaust pipe other end is connected with the flue pipe of discharging fume through installing second smoke exhaust fan on.

2. The roller kiln with the double-layer smoke exhaust channel structure as claimed in claim 1, wherein a heat exchange adjusting fan connected with an auxiliary smoke exhaust air pipe is further arranged inside the smoke heat exchanger, and thermometers are respectively arranged at the inlet and the outlet of the auxiliary smoke exhaust air pipe on the smoke heat exchanger.

3. The roller kiln with the double-layer smoke exhaust channel structure is characterized in that the smoke heat exchanger is further connected with a heat exchange air outlet pipe, the other end of the heat exchange air outlet pipe is connected with a main combustion air pipe through a combustion fan, and the main combustion air pipe is connected with a plurality of branch combustion air pipes.

4. The roller kiln with the double-layer smoke exhaust channel structure as claimed in claim 3, wherein a combustion-supporting air heating air pipe is further connected between the combustion-supporting air branch pipe and the combustion spray gun connecting pipe, and the combustion-supporting air heating air pipe is arranged in the lower smoke exhaust channel of the oxidation section kiln body in a penetrating manner.

5. The roller kiln with the double-layer smoke exhaust channel structure as claimed in claim 1, wherein a combustion spray gun is further fixedly arranged on the wall of the kiln body at the oxidation section, an exhaust port of the combustion spray gun is positioned in the upper layer exhaust channel, and the combustion spray gun is connected with a connection pipe of the combustion spray gun.

6. The roller kiln with the double-layer smoke exhaust channel structure as claimed in claim 1, wherein the partition plate is made of refractory material and is arranged below the roller in the kiln body of the oxidation stage.

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