Boiler coal feeding method and system

Abstract

The invention relates to a boiler coal feeding method and system. The boiler coal feeding method comprises the following steps that coal is subjected to drying and quality improving at first, and pulverized coal is obtained; the pulverized coal is guided into an efficient pulverized coal bin; and air generated by an air blower is blown into a boiler hearth after being mixed with the pulverized coal. The boiler coal feeding method has the beneficial effects that boiler coal feeding equipment provided by the invention is simple in structure, safe in operation and good in universality. A large-size coal pulverizing system is not used, and land resources are saved; a drying and quality improving system and a boiler can be subjected to coordination control, and the invested cost is relatively low; the drying and quality improving system is in seamless butt joint with the boiler, secondary transfer is avoided, and the pulverized coal can be effectively prevented from polluting the atmosphere; and flammable and combustible potential safety hazards of the coal pulverizing system are eliminated, and brown coal and long-flame coal can be used by a power station safely and economically. Through a drying device, the high dehydration rate can be ensured, and the coal is not subjected to combustion reaction. The coal pulverizing electricity consumption rate is decreased through the boiler, and the combustion efficiency of the boiler is improved through the pulverized coal subjected to drying and quality improving.

Description

technical field [0001] The invention relates to the field of coal power, in particular to a method for feeding coal to a boiler and a coal feeding system thereof. Background technique [0002] The power industry occupies an important position in my country's national economy and is an important guarantee for the stable operation and sustainable development of my country's social economy. As an important energy industry in my country, power industry enterprises are duty-bound to save energy, reduce emissions, and achieve low-carbon development. my country's energy structure of "rich in coal, poor in oil, and low in gas" determines that coal power will remain the main force of my country's power production for a considerable period of time in the future. [0003] At present, all power plants are equipped with power plant boiler pulverization system, see figure 1 As shown, the existing power plant boiler pulverization system includes a blower 103, a pulverizer 104, a coal bun...

AI Technical Summary

Problems solved by technology

There are many problems in the existing unit pulverization system: 1. The pulverization system is huge and occupies a large amount of land resources; Install facilities and crushing equipment for removing impurities in raw coal; 3. The equipment margin of the unit pulverization system is relatively high, and there is a resource cost; 4. Since the unit pulverization system is generally used at present, each boiler unit is equipped with a separate system In the pulverization system, the coordination and control relationship between the units is not close, the initial investment of the pulverization system is large, and large-scale production cannot be carried out

Due to the high moisture content of lignite, long-flame coal and lignite are both flammable and explosive. The pulverizing and drying system of power plants handles long-flame coal and lignite, which has potential safety hazards of explosion, which has become a key factor restricting the use or blending of long-flame coal and lignite in power plants.

[0006] Furthermore, the high water content of long-flame coal and lignite brings great difficulties to the transportation, storage and combustion of lignite, which greatly restricts the application of lignite in the field of thermal power generation

Burning lignite directly for power generation results in a power generation system that is much less efficient than a power station that burns high-quality coal

[0007] In summary, the current power plant boiler system includes a pulverizing system, but the pulverizing system is unsafe and expensive. Due to the high water content of lignite, lignite and long-flame coal have high volatile content and are highly flammable and explosive. The existing pulverizing system is used for Lignite and long-flame coal pulverization have problems of spontaneous combustion and explosion, which cannot guarantee the safety of equipment, personal safety and economical operation of boilers

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