Boiler system

Abstract

The invention relates to the technical field of boilers, in particular to a boiler system. The boiler system comprises a first boiler provided with a first primary air pipe, a second boiler provided with a second primary air pipe and a between-boiler pulverized coal conveying device. The between-boiler pulverized coal conveying device is connected with the first primary air pipe and the second primary air pipe, and conveys pulverized coal in the second primary air pipe to the first primary air pipe. On the basis, the application limitation caused by the high coal feeding power of a coal pulverizing system to a fuel-prudent ignition technology in beginning of the boilers can be reduced.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a boiler system. Background technique [0002] Fuel-saving ignition technology is an important technology in the boiler, which uses coal instead of fuel to provide heat during the start-up and shutdown of the boiler and the stable combustion of the boiler at low load, so as to achieve the purpose of saving fuel. [0003] In the early stage of boiler start-up, in order to protect the heating surface of the boiler and control the rate of temperature rise and pressure increase in the furnace, it is necessary to limit the heat load in the initial stage of start-up. However, limited by the boiler pulverization system (especially the direct blown pulverization system), there is a minimum output limit for both the coal feeder and the coal mill, which often occurs due to excessive initial fuel input and excessive heat load. The temperature and pressure increase are too fast. [0004] I...

AI Technical Summary

Problems solved by technology

However, limited by the boiler pulverization system (especially the direct-blown pulverization system), there is a minimum output limit for both the coal feeder and the coal mill, and often occurs due to excessive initial fuel input and excessive heat load. Heating up too fast

[0004] In response to the above situation, some countermeasures have been adopted at present: some power plants choose to transform the coal pulverizer by adopting a frequency converter to reduce the minimum output of the pulverization system, but this method has the disadvantages of limited effect and high investment; The power plant chooses to use oil guns for heating at the beginning of start-up, and then invests in fuel-saving ignition technology after the boiler temperature and pressure reach a certain level, but this affects the popularization and application of fuel-saving ignition technology

[0005] It can be seen that in the prior art, the application of fuel-saving ignition technology in the early stage of boiler start-up is still limited due to the large amount of initial fuel input in the pulverizing system.

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