Novel method for reducing nitrogen oxide emission through preheating calcination
A nitrogen oxide and calcination technology, which is applied in the field of cement production, can solve the problems of large ammonia water consumption and high denitrification cost, and achieve the effect of energy saving
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Embodiment 1
[0038] A novel preheating calcination method for reducing the emission of nitrogen oxides is characterized in that it comprises the following steps:
[0039] (1), air supply
[0040] The fresh air is preheated by the air preheater and sent to the calciner. The air preheater diverts a part of the secondary air to the air preheater, heats the fresh air by means of isolated heat exchange, and reduces the excess of exhaust gas. One-time utilization, so that the energy can be recycled for many times, which greatly saves energy;
[0041] (2), drying
[0042] Before calcination, the raw meal and coal powder are dried by high-temperature airflow to reduce the water content of raw meal and coal powder. The drying temperature of raw meal and coal powder is 60 degrees, and the moisture content in raw meal and coal powder The water content increases the temperature of calcination;
[0043] (3), preheating
[0044] The dried raw meal and pulverized coal are preheated separately through...
Embodiment 2
[0054] A novel preheating calcination method for reducing the emission of nitrogen oxides is characterized in that it comprises the following steps:
[0055] (1), air supply
[0056] The fresh air is preheated by the air preheater and sent to the calciner. The air preheater diverts a part of the secondary air to the air preheater, heats the fresh air by means of isolated heat exchange, and reduces the excess of exhaust gas. One-time utilization, so that the energy can be recycled for many times, which greatly saves energy;
[0057] (2), drying
[0058] Before calcination, the raw meal and coal powder are dried by high-temperature airflow to reduce the water content of raw meal and coal powder. The drying temperature of raw meal and coal powder is 75 degrees, and the moisture content in raw meal and coal powder The water content increases the temperature of calcination;
[0059] (3), preheating
[0060] The dried raw meal and pulverized coal are preheated separately through t...
Embodiment 3
[0070] A novel preheating calcination method for reducing the emission of nitrogen oxides is characterized in that it comprises the following steps:
[0071] (1), air supply
[0072] The fresh air is preheated by the air preheater and sent to the calciner. The air preheater diverts a part of the secondary air to the air preheater, heats the fresh air by means of isolated heat exchange, and reduces the excess of exhaust gas. One-time utilization, so that the energy can be recycled for many times, which greatly saves energy;
[0073] (2), drying
[0074] Before calcination, the raw meal and coal powder are dried by high-temperature airflow to reduce the water content of raw meal and coal powder. The drying temperature of raw meal and coal powder is 65 degrees, and the moisture in raw meal and coal powder is reduced by drying The water content increases the temperature of calcination;
[0075] (3), preheating
[0076] The dried raw meal and pulverized coal are preheated separ...
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