A Calculation Method for Opening Quantity of Inlet Fans on the Top of Brick-fired Tunnel Kiln

Abstract

The invention relates to a method for calculating the opening quantity of air inlet fans at the top of a brick-burning tunnel kiln. The method comprises the following steps of measuring the fuel heatquantity F required per hour for a certain section of a roasting kiln and the actual air quantity K required for complete combustion of every 1000 kilocalories of fuel, and calculating the air quantity Q required per hour for a certain section of the roasting kiln according to the formula Q=K*F so as to calculate the opening quantity n of feeding fans according to the quantity q of air conveyed per hour by each fan. According to the method, the feeding fans are arranged at the top of a heat preservation zone area, and sufficient oxygen is conveyed into a high-temperature roasting zone area through the feeding fans, so that roasting under the condition of no sufficient oxygen, caused by hot air extraction in a cooling zone area, in the high-temperature roasting zone area is prevented, sufficient roasting of brick blanks can be ensured, and the role of improving the practical performance can be played.

Description

technical field [0001] The patent of the present invention relates to the technical field of brick-burning tunnel kiln, in particular to a method for calculating the number of openings of the air inlet fans at the top of the brick-burning tunnel kiln. 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industry has been transformed and upgraded, and all parts of the country have eliminated A large number of outdated small earthen kilns have built a large number of tunnel kilns, and the current penetration rate of tunnel kilns has reached more than 50%.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 w...

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Problems solved by technology

Although some tunnel 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 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 to suck in natural air from the exit end of the tunnel kiln. If the kiln is built too long, the natural air entering from the tail will be too much resisted by the brick 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 3000C, and some are still on fire, so that the fired red bricks are ejected out of the kiln for cooling, so that a large amount of heat is dissipated into the air, not only Affect the environment and cause heat waste

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