Combined type coal pulverizing system

Abstract

The invention discloses a combined type coal pulverizing system. A medium speed coal mill direct blowing type coal pulverizing system and a double-in and double-out coal mill direct blowing type coal pulverizing system are in parallel connection with a furnace and a combustor. The furnace is connected with an air feeder, a primary air fan, and a seal fan, and the seal fan is simultaneously connected with the medium speed coal mill direct blowing type coal pulverizing system and the double-in and double-out coal mill direct blowing type coal pulverizing system. The combined type coal pulverizing system selectively delivers coals to a medium speed coal mill or a double-in and double-out coal mill through a coal feeder according to the different coal qualities of coals. If the coals are better in the coal qualities, the coals are delivered to the medium speed coal mill as far as possible, so that a lower coal pulverizing power consumption is guaranteed, and economical efficiency of power plant operation is guaranteed. If the coals are worse in the coal qualities, the coals are delivered to the double-in and double-out coal mill due to the fact that the coals are not suitable for pulverization in the medium speed coal mill, so that unsafe factors brought by barely running the medium speed coal mill are avoided, and the safety of the power plant operation is guaranteed.

Description

technical field [0001] The invention relates to a pulverizing system in a coal-fired thermal power plant. Background technique [0002] The pulverizing system is an important auxiliary system in a coal-fired thermal power plant. The pulverizing system mainly includes two types: direct blowing type and storage bin type. The direct blowing pulverizing system is divided into two types according to the type of coal mill: Steel ball coal mill, medium speed coal mill, fan coal mill and other direct blowing systems. [0003] According to the different types of coal fired in power plants, the most widely used pulverizing system is mainly the medium-speed coal mill positive pressure direct blowing type cold primary air pulverizing system, such as figure 1 As shown, and the double-inlet and double-outlet steel ball coal mill positive pressure direct blowing type cold primary air pulverization system, such as figure 2 shown. [0004] The advantage of the medium-speed coal mill is t...

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Problems solved by technology

[0007] For an operating power plant, if a simple medium-speed pulverizer positive pressure direct blowing system is used, when the coal quality of the coal fired is high abrasiveness, high hardness, high ash and low volatile coal, the power plant The safety of the operation will be greatly affected, and it may even fail to operate; but if a simple double-inlet and double-outlet steel ball mill positive pressure direct blowing system is used, then when the coal quality is suitable for medium-speed grinding For different types of coal, the power consumption of coal grinding is much higher than that of medium-speed grinding, and the economic efficiency of power plant operation is relatively poor.

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