Waste heat recycling system and method for sintered brick tunnel kiln

Abstract

The invention discloses a waste heat recycling system and method for a sintered brick tunnel kiln. The waste heat recycling system and method solve the problems of unreasonable arrangement of a roasting kiln, low energy utilization rate, poor waste heat recycle, high environmental pollution and the like. The waste heat recycling system involves a roasting kiln, a low-temperature drying kiln and a high-temperature drying kiln, wherein a pipeline A communicates between the green brick inlet end of the low-temperature drying kiln and the rear end of the roasting kiln, a moisture removal fan is mounted on the pipeline A, a pipeline B communicates between the green brick outlet end of the low-temperature drying kiln and a high-temperature quenching zone of the roasting kiln, a pipeline C communicates between the pipeline B and the rear end of the roasting kiln, and a waste heat fan is mounted on the pipeline C; and a pipeline D communicates between the front end of the roasting kiln and the green brick outlet end of the high-temperature drying kiln, a roasting kiln induced draft fan is mounted on the pipeline D, and a desulfuration dust remover is arranged at the green brick inlet end of the high-temperature drying kiln in a communicating mode through a pipeline E. According to the waste heat recycling system, on the premise of ensuring that green bricks are fully dried by a drying kiln and products are fired by the roasting kiln, the fume exhaust amount and the fume exhaust temperature are reduced as much as possible, and the system is stable and reliable in operation and free of secondary pollution.

Description

technical field [0001] The invention relates to the technical field of sintered brick tunnel kilns in the brick and tile industry, in particular to a system and method for recovering waste heat from a sintered brick tunnel kiln. Background technique [0002] Tunnel kiln is a high-efficiency roasting kiln popularized and applied in my country's brick and tile industry. It is generally composed of drying kiln and roasting kiln. It is characterized by large output, high degree of automation, stable product quality and controllable firing parameters. The calorific value of adobe bricks in tunnel kiln sintered brick production lines that have been completed and put into operation in China is generally around 350Kcal / Kg, which is generally about 100 Kcal / Kg higher than the calorific value of sintered bricks required by theoretical calculations. The main reason for the high energy consumption of the tunnel kiln is not only the extensive management and operation methods, but also th...

AI Technical Summary

Problems solved by technology

The main reason for the high energy consumption of the tunnel kiln is not only the extensive management and operation methods, but also the flaws in the design of the tunnel kiln’s smoke and air system

When most brick factories are built, they pay more attention to the heat preservation of the kiln, but ignore the design of the flue gas system; after the sintered brick production line is completed and put into operation, the exhaust gas temperature is relatively high, the amount of flue gas emitted is also relatively large, and the temperature of the fired products out of the kiln is also low. High, the energy of the tunnel kiln production system is not only the heat loss of the kiln body, but also the heat loss of the exhaust gas and the sensible heat of the fired product, resulting in high energy consumption of the tunnel kiln

The root cause is that the excess air coefficient of the air supplied to the roasting kiln is about 5.0, which is far higher than the excess air coefficient of 1.2 to 1.5 for power plant boilers, and the low-temperature air is not fully utilized for circulation for drying bricks; in addition , the cooling conditions of the fired products before they leave the kiln are poor, resulting in a product leaving the kiln at a much higher temperature than normal

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