A petal-shaped ammonia injection device for coke oven flue gas denitrification

Abstract

The invention discloses a petal-shaped ammonia spray device used for coke oven flue gas denitration. The device comprises a circulating fan, a flue gas feeding tube, an ammonia gas feeding tube, a spiral flow plate, a flow disturbing member, a mixer, a tube holder, secondary ammonia spraying tubes, primary ammonia spraying tubes and a flue. Denitrated flue gas goes through the circulating fan and enters the mixer together with ammonia gas, the denitrated flue gas and the ammonia gas are fully mixed in a spiral flow entrainment manner, the obtained mixture sequentially goes through two layers of the primary ammonia spraying tubes and the secondary ammonia spraying tubes to form micro-scale rapid jet flow, the micro-scale rapid jet flow interacts with mainstream coke oven flue gas, and the micro-scale rapid jet flow and the mainstream coke oven flue gas go through the annular flow disturbing member and then are further fully mixed. The denitrated coke oven flue gas goes through the built-in spiral flow mixer and dilutes ammonia gas, and micro-scale rapid crossbar jet flow is fully mixed with the mainstream flue gas, so the device has the advantages of compact system, high efficiency energy saving and accurate ammonia control.

Description

technical field [0001] The invention belongs to the technical field of air pollutant control, and in particular relates to a petal-shaped ammonia injection device for coke oven flue gas denitrification. technical background [0002] A coke oven is a furnace that converts coal to produce coke, usually constructed of refractory bricks and blocks. The heat required for coking is usually provided by gas combustion. Therefore, coke ovens also include combustion chambers, flues and chimneys, similar to power plant boilers, but different from conventional boilers, mainly in three aspects: 1. A single coke oven Two flues are connected to the chimney, and the flow rate of coke oven flue gas in each flue is relatively small; 2. The temperature of coke oven flue gas directly discharged into the atmosphere is relatively high, usually 280-300°C; 3. Coke oven flue gas The cross-section of the road is usually an arched door structure, most of which are buried below the ground. Due to the...

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Problems solved by technology

[0005] Purpose of the invention: The present invention provides a petal-shaped nozzle for coke oven flue gas denitrification to solve the problems that the conventional ammonia injection grid is not suitable for coke oven flue layout, and the conventional ammonia mixing process will cause the flue gas temperature to decrease and the system resistance to increase. Ammonia plant

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