Middle storage type medium-speed milling positive pressure direct blowing type powder making system

Abstract

The invention relates to a middle storage type medium-speed milling positive pressure direct blowing type powder making system comprising a plurality of coal mills, dynamic separators at outlets of the coal mills, a plurality of first coal powder pipes arranged at outlets of the dynamic separators in parallel, air and powder mixing balance bins correspondingly connected to first coal powder pipe outlets of every two corresponding coal mills, a plurality of second coal powder pipes correspondingly connected with air and powder mixing balance bin outlets in parallel, coal powder burners connected to second coal powder pipe outlets, and a boiler provided with the multiple coal powder burners correspondingly. Through the middle storage type medium-speed milling positive pressure direct blowing type powder making system, mill overhauling can be achieved without stopping of the boiler, the coal mills can be switched freely without interference to the burning stability of the boiler, consistency of uniformity of air and powder mixing in all coal powder pipelines can be further achieved, uniformity and stability of burning are achieved finally, and the requirements of environmental protection and energy saving are met.

Description

technical field [0001] The invention relates to the field of pulverizing system equipment for pulverized coal boilers, in particular to an intermediate storage bin type medium-speed mill positive pressure direct blowing pulverizing system. Background technique [0002] In coal-fired boilers, the pulverizing system is a very important system of the boiler combustion system. It undertakes the function of coal powder preparation and transportation in the boiler combustion system. Provide suitable air volume and air temperature for the transportation of pulverized coal. The normal, safe and economical operation of the boiler pulverizing system directly determines the economical and safe operation of the unit. The pulverizing system of pulverized coal boiler is often designed according to different coal types. Generally speaking, the pulverizing system is divided into an intermediate storage bin type steel ball pulverizer pulverization system and a medium-speed coal pulverizer ...

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Problems solved by technology

[0003] At present, the pulverizing direct blowing system using medium-speed coal mills has been recognized and accepted by most boiler factories. Due to the large number of coal mills in large boilers, the switching of coal mills will not affect the load capacity and operation of the boiler, but in In the pulverization system of small and medium-sized boilers, the number of coal mills is only 1 to 3. When the coal mills are switched and overhauled, it often limits the load capacity of the boiler and the safe and stable operation of the boiler, which brings great impact on the economical operation of the boiler. huge loss

In addition, the upper part of the medium-speed coal mill mostly adopts a centrifugal separator to separate and distribute the coal powder particles. To a certain extent, it is difficult to achieve uniform distribution of the coal powder particles in the coal powder outlet pipeline. Environmental protection requirements are strict, and the blockage of the pulverizing system of small and medium-sized boilers often restricts the emission requirements for further reducing environmental protection indicators

[0004] The occurrence of this kind of situation has brought certain difficulties to the safe, economical and stable operation of small and medium-sized boilers, and has also caused certain troubles to the current environmental protection control of boilers. On the basis of safety, economy and operation, a system is designed to solve the problem of switching and overhauling coal pulverizers of small and medium-sized boilers and poor combustion stability caused by uneven distribution of pulverized coal.

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