Smoke catalyzing recycling device

Abstract

The invention relates to a smoke catalyzing recycling device which comprises a boiler, a combustor, a wind bellow and a smoke purifying and exhausting system. The combustor communicates with the boiler. The wind bellow conveys fuel gas to the combustor. The smoke purifying and exhausting system is located on the upper portion of the boiler. The smoke purifying and exhausting system comprises a smoke inlet pipeline, a catalyzing tower, an online monitor, a smoke outlet pipeline and a circulating wind pipe. The lower portion of the catalyzing tower communicates with the boiler through the smokeinlet pipeline, and the upper portion of the catalyzing tower is connected with the smoke outlet pipeline. The online monitor is arranged above the catalyzing tower. One head of the circulating wind pipe communicates with one side of the smoke outlet pipeline, and the other head of the circulating wind pipe communicates with the wind bellow. A wind return electric valve is arranged on the circulating wind pipe. The wind bellow is provided with a wind bellow electric valve. According to the smoke catalyzing recycling device, smoke communicates with the wind bellow through the circulating wind pipe, by monitoring the content of nitric oxide in the smoke in real time, the nitric oxide discharge is automatically adjusted according to the proportion to reach the set value, and meanwhile, normalcombustion of the boiler is met. The smoke purification efficiency is effectively improved, and the emission of harmful gas is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a flue gas catalytic recirculation device. Background technique [0002] Pollutants emitted from coke oven chimneys are mainly SO 2 , NO x And smoke and dust, etc., the pollutants are continuously discharged in the form of organized elevated point sources, which is one of the main pollution sources of polluting the atmosphere. When the gas burns in the vertical flue of the coke oven, it will generate nitrogen oxides NO x According to the mechanism of its generation, it can be divided into three types: temperature thermal type, hydrocarbon fuel fast type and oxygen-containing component fuel type. When the excess air coefficient α=1.1 and the air is preheated to 1100°C, the theoretical combustion temperature of coke oven gas is 2350°C, and the theoretical combustion temperature of blast furnace gas is 2150°C. It is generally believed that the actual combustion tem...

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Problems solved by technology

The application controls the generation of nitrogen oxides in coke oven flue gas from the source, and avoids the nitrogen oxides by mixing pure oxygen and circulating flue gas. 2 The introduction of nitrogen oxides in coke oven flue gas meets national standards, but there are still the following defects: (1) The oxygen used is expensive to manufacture, and transportation and storage are troublesome. The coke oven production environment is harsh and oxygen delivery is dangerous. (2) Oxygen is mixed with the combustible gas in the flue gas, and then sent to the coke oven for combustion. This process is equivalent to premixed combustion, the combustion flame becomes shorter, and the temperature uniformity of the carbonization chamber decreases, which affects the quality of coke; ( 3) The temperature of the flue gas in the external circulation is high and contains a small amount of combustible gas. There is a possibility of deflagration during the mixing process of oxygen and flue gas in the external circulation

However, this application uses a two-way circulating fan between the two groups of closed and open regulating valves, and each carbonization chamber needs two circulating fans. During the construction process, more than 100 fans are needed, and the investment cost and operating cost are relatively high, and Fan operation noise is loud, affecting manual operation

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