Method and mechanism for increasing temperature of primary air of boiler pulverizing system

Abstract

The invention discloses a method for increasing the temperature of primary air of a boiler pulverizing system. The primary air is further heated by utilizing superheated steam of a boiler, so that the drying capability of the primary air is increased. On a pipeline from a low-temperature superheater outlet header to a next superheater header, a steam-gas heat exchanger is added, and a part of or all primary air from an outlet of an air preheater is heated by using steam. The invention further provides a mechanism used by the method. According to the method and the mechanism which are disclosed by the invention, the temperature of the primary air can be independently controlled, so that the requirement of drying capacity is satisfied, and the pulverizing system is safely and reliably operated; the temperature of the primary air is increased, so that the problem of serious imbalance of the primary air and secondary air can be preferably solved, and the proportion of the primary air to the secondary air is kept within a reasonable design range; and the interference of unreasonable distribution of the primary air and the secondary air on a combustion organization is reduced, so that the problems of unreasonable distribution of furnace box temperature, overtemperature of furnace outlet gas and ultrahigh exhaust gas temperature are solved at the same time.

Description

technical field [0001] The invention belongs to the field of heating and the field of boiler performance design. The invention relates to a method and a mechanism for increasing the primary air temperature of a pulverizing system of a boiler. It relates to a boiler coal pulverizer, especially a medium-speed coal pulverizer. Background technique [0002] The coal quality of power plant boilers that use pulverized coal is gradually deteriorating, and high-moisture coals, especially lignite (large moisture, 15-60%), are increasingly used in power plant boilers, which is harmful to the safety and economy of boilers. Running puts new demands on it. After the moisture content of the coal increases, in order to meet the needs of increasing the primary air drying output of the pulverizing system, the measures that can be taken for the pulverized system of the medium-speed coal mill are to increase the primary air temperature at the entrance of the coal mill, or increase the primar...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a method and mechanism for increasing the primary air temperature of the boiler pulverizing system, which is used to solve the problem of primary air temperature of the boiler pulverizing system using high-moisture coal. The technical problem that the temperature cannot meet the drying output of the coal mill

Images