Low-nitrogen roasting furnace and control method thereof

Abstract

The invention discloses a low-nitrogen roasting furnace and a control method thereof. The low-nitrogen roasting furnace comprises a plurality of heating units which are adjacently communicated, each heating unit comprises at least one heating part and at least one temperature measuring part, at least one temperature measuring part is arranged behind each heating part, each heating part and the adjacent temperature measuring part located at the downstream portion of flue gas flow form a control base point, and the average temperature corresponding to the control base points in the flue gas flowing direction is gradually reduced. According to the low-nitrogen roasting furnace, the heating parts and the temperature measuring parts are arranged in a matched mode, and the power of the heating parts is controlled through one-to-one correspondence of the temperature measuring parts and the heating parts, so that the temperature is controlled more accurately, and generated thermal nitrogen oxides caused by improper temperature control are reduced.

Description

technical field [0001] The present application relates to a low-nitrogen roaster and its control method. Background technique [0002] The prebaked anode roaster is one of the core equipments in the prebaked anode production process. The normal operation of the roaster is the guarantee of the stable output and quality of the prebaked anode production. As my country's environmental protection requirements become more and more stringent, online monitoring equipment is generally installed for roaster flue gas, and the stable discharge of roaster flue gas has become a necessary prerequisite for the stable operation of roaster. [0003] At present, the nitrogen oxides of most prebaked anode roasters before denitrification cannot be discharged stably, and the actual measured value before denitrification is generally 80-140mg / m 3 , and with the periodic change of the roasting curve, SCR or SNCR equipment must be used for denitrification in order to stably meet the emission standar...

AI Technical Summary

Problems solved by technology

[0003] At present, the nitrogen oxides in most prebaked anode roasters before denitrification cannot be discharged stably, and the actual measured value before denitrification is generally 80-140mg / m 3 , and as the roasting curve changes periodically, SCR or SNCR equipment must be used for denitrification in order to stably meet the emission standards

The investment of a denitrification equipment for a roaster ranges from more than one million to several million, and an enterprise often has multiple roasters, which require multiple denitrification equipment to meet the demand, requiring a large investment in equipment

In addition to the cost of equipment construction, the annual cost of electricity and denitrification agent is also several million yuan (the cost of roasting and denitrification per ton of product is 20-30 yuan, and the annual output of prebaked anodes of an enterprise ranges from 100,000 to 1 million tons). Anode production enterprises are not a small cost

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