Distributed air curtain device for supercritical CO2 boiler

Abstract

The invention discloses a distributed air curtain device for a supercritical CO2 boiler, and belongs to the technical field of boiler combustion. The distributed air curtain device comprises an air inducing mechanism and an air injection mechanism, wherein the air inducing mechanism comprises at least one high-speed induced draft fan, and an inlet of the high-speed induced draft fan is connected to a boiler body through a pipeline; the high-speed induced draft fan is used for extracting part of flue gas behind an economizer; the air injection mechanism comprises a main air inlet pipe, an airflow flat slit nozzle and a shunt pipe, one end of the main air inlet pipe is connected with an outlet of the high-speed induced draft fan, and the other end of the main air inlet pipe is connected withthe shunt pipe; the end part of the shunt pipe is connected with the airflow flat slit nozzle; and an outlet of the airflow flat slit nozzle is vertically distributed over against the heat load concentration position at the upper part of a combustor. The distributed air curtain device for the supercritical CO2 boiler is uniform in air outputting, prevents the situation that the service life of awater cooling wall body is shortened due to the fact that an air film is attached to the water cooling wall body for a long time and causes wind erosion to the wall body, and can be used for various combustor arrangement conditions of the supercritical CO2 boiler.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion, and more specifically relates to a supercritical CO 2 Distributed air curtain device for boiler. Background technique [0002] At present, due to the limitation of the pressure and temperature resistance of materials, the steam temperature and pressure of traditional steam boilers cannot be greatly improved, resulting in the improvement of the efficiency of traditional steam boilers entering a very slow stage. Supercritical CO 2 Compared with the steam Rankine cycle, the boiler has a higher cycle efficiency in the medium temperature zone, and the supporting turbine has a small volume and a compact overall structure, which has attracted more and more attention from researchers at home and abroad. However, due to the supercritical CO 2 The physical and chemical properties of the working fluid in the boiler have changed, the heat transfer performance is lower than that of conventional s...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical problem of preventing wind erosion of the wall caused by uneven air flow from nozzles in the over-temperature system of the water-cooled wall and the airflow parallel to the water-cooled wall, the present invention provides a supercritical CO 2 The distributed air curtain device of the boiler, the device has uniform air output, preventing the long-term attachment of the air film to the water-cooled wall, which will cause wind erosion on the wall and shorten the life of the water-cooled wall

Images