Enclosed air system of medium speed mill in heat-engine plant

Abstract

The invention relates to an enclosed air system of a medium speed mill in a heat-engine plant, comprising primary fans, an enclosed air header and a cold primary air header, wherein at least two left and right connection pipelines evenly distributed among coal mills (A to F) are additionally added between the enclosed air header and the cold primary air header, and the left and right connection pipelines are also connected with the enclosed air header and the cold primary air header; the cold primary air header at the outlet of the primary fans is directly connected with the enclosed air header, and the cold primary air header replaces an enclosed fan to directly supply enclosed air for the coal mills and coal feeders; and left and right spile doors are respectively arranged at the junctions of the left-right connection pipelines and the cold primary air header, and the left-right spile doors are synchronously opened or closed with the primary fans at the same side. The enclosed air system can save the used amount of the enclosed fans in an electrical machinery plant, realize remarkable energy conservation benefit and greatly improve safe operation reliability of boiler equipment.

Description

technical field [0001] The invention relates to a sealing air system, in particular to a system for supplying sealing air to a coal mill. Background technique [0002] In modern thermal power plants, the boiler is a very important main equipment. It can efficiently burn coal and generate high-temperature and high-pressure steam to drive the turbo-generator unit to deliver high-quality electric energy to the grid. The basic production process of a thermal power plant is as follows: figure 1 Shown: [0003] The fuel is burned in the boiler 1 to generate steam with certain parameters, and the thermal energy of the steam is converted into electric energy through the steam turbine generator set 2 . During this process, the blower 3 delivers enough air to the furnace of the boiler to ensure that the fuel is fully combusted. The waste smoke generated after combustion is sucked by the induced draft fan 4 and discharged through the chimney 6 after desulfurization 5 . In order to e...

AI Technical Summary

Problems solved by technology

[0012] The present invention solves the technical problem of energy waste and safety and reliability of the sealing air system in the existing wind and smoke system, and provides a medium-speed coal pulverizer sealing air system in a thermal power plant. Energy-saving benefits, and can greatly improve the safety and reliability of boiler equipment

Images