Hot-blast stove with multiple spraying holes

Abstract

The invention discloses a hot-blast stove with multiple spraying holes. The hot-blast stove comprises a burning section, a first air mixing section and a second air mixing section. A main nozzle is arranged at the front end of the burning section, and an automatic ignition nozzle and a recirculating air induced pipe used for ventilation towards the inside of the burning section are arranged outside the burning section. The first air mixing section comprises an outer tube body and a metal multiple-spraying-hole air mixing barrel which is coaxial with the outer tube body and serves as an inner tube body. An annular gap or annular space is reserved between the outer tube body and the multiple-spraying-hole air mixing barrel serving as the inner tube body to be used as an air intake chamber. A plurality of spraying holes are evenly distributed in the wall of the multiple-spraying-hole air mixing barrel. The front end of the multiple-spraying-hole air mixing barrel, serving as the inner tube body, of the first air mixing section is connected with the rear end of the burning section in a sealing mode. A first hot-air outlet is formed in the rear end of the multiple-spraying-hole air mixing barrel. A recirculating air inlet is formed in the wall of the outer tube body of the first air mixing section and is connected with a recirculating air hose. By means of the hot-blast stove with the multiple spraying holes, high-temperature NOx generation is reduced, fast and uniform mixing of circulation cooling air and high-temperature hot air is guaranteed, the whole equipment is compact and small in size, and the hot-blast stove can be arranged flexibly according to production needs.

Description

technical field [0001] The invention belongs to the field of thermal energy engineering, and in particular relates to a multi-nozzle type hot blast stove. Background technique [0002] At present, activated carbon (activated coke) is mostly used in the desulfurization and denitrification process of sintering flue gas in iron and steel enterprises. The regeneration of activated carbon (activated coke) in this process requires indirect heating with flue gas at about 500 °C, and the flue gas temperature after heat exchange is about 300 °C. In order to improve heating efficiency, the flue gas is usually circulated, such as figure 1 shown. The main function of the hot blast stove is to reheat the circulating flue gas. Under this process, the furnace of the hot blast stove is operated under positive pressure. In order to prevent hot smoke from escaping, the overall sealing of this type of hot blast stove is required to be high. [0003] Activated carbon dry process is currently...

AI Technical Summary

Problems solved by technology

However, the existing hot blast stove usually adopts a full-lined structure, and the weight of the equipment is relatively large; the temperature of the combustion chamber is high, and the amount of NOx generated at high temperature is relatively large; the circulating cooling air only directly enters the mixing chamber through one or several nozzles and the high-temperature flue gas Mixing, the uniformity of the mixed air is poor, a larger mixing space is required, and the equipment is larger

The layout of the furnace can usually only be arranged horizontally, not suitable for vertical arrangement

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