Temperature-raising method and system for coke dry quenching furnace

Abstract

The invention relates to the technical field of energy recovery and discloses a temperature-raising method and a temperature-raising system for a coke dry quenching furnace. The method comprises the steps of laying cold coke from the bottom of the coke dry quenching furnace to a position higher than the top of the chute zone of the coke dry quenching furnace; putting hot coke on cold coke from the position above cold coke; carrying out coke discharging on coke dry quenching furnace, and introducing the circulating air; and controlling the coke discharging speed and / or air speed and / or air quantity of the introduced circulating air according to the temperature of the circulating air required for heat exchange. By virtue of the method disclosed by the invention, cold coke in the coke dry quenching furnace is slowly heated, the direct contact between the chute zone of the coke dry quenching furnace and high-temperature hot coke is avoided, the degree of change of the thermal stress is reduced, the integrity of the refractory material at the chute of the coke dry quenching furnace is ensured, the temperature-raising period is shortened and the service life of the refractory material is prolonged.

Description

technical field [0001] The invention relates to the technical field of energy recovery, and is mainly applicable to a heating method and system for dry quenching coke ovens. Background technique [0002] In the daily use of the CDQ device, since the CDQ device needs to operate continuously at a high temperature of about 900°C, daily inspection and maintenance cannot solve the hidden faults inside the CDQ device. The CDQ device needs to be shut down for annual maintenance every year, that is, the staff need to enter the interior of the CDQ oven and other equipment to repair hidden faults, so as to ensure that the CDQ device can continue to work normally. The CDQ oven is an important CDQ device. Its structure is a shaft kiln body, and the inner layer is made of refractory bricks. Therefore, the staff need to According to the nature of the refractory material, the heating and cooling work is completed in a planned way. The initial temperature rise control method is to pass th...

AI Technical Summary

Problems solved by technology

The disadvantages of this heating control method are: complicated steps (production, installation of burners, etc.), high risk (poisoning, explosion), long heating cycle (many construction projects), energy waste, etc.

[0003] In the later stage, the construction units used the method of preloading the cold coke to the bottom of the CDQ oven (the upper part of the central air cap), and then throwing the red coke to raise the temperature of the CDQ oven. However, because this method requires red coke at 1000 Directly put into the cooling chamber of the CDQ oven, a large amount of red coke is directly in contact with the chute area and the boiler, the temperature fluctuates frequently at ±100°C, and the thermal stress changes greatly

However, due to the complex structure, the refractory material (corbel brick) in the channel area of ​​the CDQ coke oven cannot expand freely under the influence of rapid changes in thermal stress and breakage occurs, which seriously affects the service life of the corbel brick.

Moreover, the heating time of this method still needs 2-3 days, and the longer heating time affects the output of high-quality CDQ coke and the recovery of energy (steam)

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