Energy-saving and environment-friendly brick burning tunnel kiln for achieving complete separation of smoke and waste heat

Abstract

The invention relates to an energy-saving and environment-friendly brick burning tunnel kiln for achieving complete separation of smoke and waste heat. The tunnel kiln comprises a tunnel kiln body, acart entrance and a cart exit for a brick cart to enter and exit from are formed in the left and right ends of the tunnel kiln body respectively, and the tunnel kiln body is divided into a brick blankpreheating warming band area, a high-temperature roasting band area, a heat preservation band area and a cooling band area from left to right in sequence; a smoke desulphurization device is connectedto the top of the brick blank preheating warming band area, supply fans are arranged at the top of the heat preservation band area, and air exhausters are installed on the side walls of the two sidesof the rightmost end of the cooling band area; an air exhaust pipe is connected to the top of the cooling band area and communicated with a drying kiln, and a first fan is installed in the air exhaust pipe. The energy-saving and environment-friendly brick burning tunnel kiln has the advantages of being simple in structure, easy to manufacture, practical and efficient.

Description

technical field [0001] The invention relates to a tunnel kiln, in particular to an energy-saving and environment-friendly brick-burning tunnel kiln with complete separation of flue gas and waste heat. Background technique [0002] my country's brick industry has used tunnel kilns to burn red bricks for more than 50 years. It has developed from a small section of 1.5 meters to the current tunnel kiln with a large section of 10.5 meters. Especially in recent years, my country's manufacturing industry has been transformed and upgraded, and all parts of the country have eliminated A large number of outdated small earthen kilns have built a large number of tunnel kilns, and the current penetration rate of tunnel kilns has reached more than 50%. However, more than 98% of the production plants so far send the flue gas heat in the firing process of the tunnel kiln to the drying kiln to dry the bricks. For the kiln body, extracting waste heat at the air inlet at the tail will greatly...

AI Technical Summary

Problems solved by technology

Although some roasting kilns are equipped with dampers for extracting waste heat in the cooling zone, the waste heat extracted from the cooling zone also enters the natural air from the tail, and the extraction of waste heat reduces the oxygen entering the roasting zone, which not only affects the roasting speed but also causes the roasting zone to be short. Oxygen combustion will cause excess carbon monoxide in the exhausted flue gas

[0004] At present, the length of the tunnel roasting kiln built in my country's brick industry is mostly between 100 and 120 meters. Since there is no oxygen supply device in the middle, the suction of the smoke exhaust fan is completely relied on to form a negative pressure in the kiln and suck in natural air from the exit end of the roasting kiln. , if the kiln is built longer, the natural air entering from the tail will be too much resisted by the adobe, which will cause insufficient oxygen in the roasting zone and affect the output, which is not suitable for the pursuit of high output in my country's brick industry.

Insufficient length and the pursuit of output make the red bricks ejected out of the kiln still above 300°C, and some are still on fire, so that the fired red bricks are ejected out of the kiln for cooling, and a large amount of heat is dissipated into the air. Not only affect the environment but also cause heat waste

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