Front wall heating surface structure of CDQ (Coke Dry Quenching) waste heat boiler

Abstract

The invention discloses a front wall heating surface structure of a CDQ (Coke Dry Quenching) waste heat boiler. In order to solve the problem of water circulation faults of a conventional water-cooled wall of a CDQ waste heat boiler, the front wall heating surface structure of the CDQ waste heat boiler comprises a water-cooled wall section and a lateral washing section; a pipe at the water-cooled wall section extends to the interior of a gas duct at the tail part of a waste heat boiler to form the lateral washing section; the axial line of a pipe at the lateral washing section forms an inclined angle of not larger than 30 degrees with the horizontal plane; and one end of the pipe at the lateral washing section is communicated with the pipe at the water-cooled section, and the other end is fixed on a lower interconnecting box close to a front wall or a rear wall. The pipe on the water-cooled wall of the front wall of the CDQ waste heat boiler extends to the interior of the gas duct at the tail part of the waste heat boiler to form the lateral washing section, so that the heat absorption capacity of the front wall heating surface is increased, and the water circulation safety of the front wall heating surface is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal energy engineering application, and in particular relates to a front wall heating surface structure of a CDQ waste heat boiler. Background technique [0002] The CDQ device has many advantages such as energy saving, consumption reduction, cost reduction, environmental pollution reduction, and improvement of coke quality. The high-temperature circulating gas of the CDQ is cooled by the primary dust collector to the waste heat boiler, and then returned to the CDQ furnace through the secondary dust collector, circulating fan and auxiliary economizer. With the popularization of dry coke quenching technology and the large-scale of coke dry quenching equipment, enterprise decision makers, on the basis of continuously improving their management and operation level, regard improving the steam parameters of waste heat boiler as one of the important measures to save energy, reduce emissions and improve econ...

AI Technical Summary

Problems solved by technology

Due to the layout of the coke CDQ system, generally among the four-wall membrane heating surfaces, the front wall heating surface has the shortest length and the least heat absorption, which is likely to cause water circulation failure

If the tube bundle of the heating surface of the front wall is inserted into the inlet of the waste heat boiler in the form of slag tubes, although the heat absorption of the heating surface of the front wall can be supplemented, the high heat load at the inlet of the waste heat boiler and the high temperature during reburning of the air injection will easily cause Deviating from nucleate boiling in the slag tube and overheating of the tube, burning and bursting

The above two conditions will seriously affect the safety of the boiler

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