CFB unit coal feeding system

Abstract

The invention discloses a CFB unit coal feeding system. The CFB unit coal feeding system comprises a first-grade buffer silo, coal feeders, a conveying device, a coal mixing device, a second-stage buffer weighing coal bin and coal feeders, wherein the second-stage buffer weighing coal bin and the coal feeders are located in a main workshop. The coal feeders include the first coal feeder, the second coal feeder, the third coal feeder and the fourth coal feeder. The coal mixing device is arranged on the conveying device. The first coal feeder is arranged below the first-grade buffer silo. A first belt conveyor is arranged below the first coal feeder. The first belt conveyor is used for conveying coal to a second belt conveyor. The coal mixing device is arranged on the second belt conveyor. The weighing coal bin is located below the coal mixing device. The fourth coal feeder is arranged below the weighing coal bin. The second coal feeder and the third coal feeder are arranged below the fourth coal feeder. According to the CFB unit coal feeding system, a coal conveying system and a coal feeding system of a CFB unit are combined into the coal feeding system. The process system is simplified. The construction cost is reduced. Energy consumption is reduced, and the construction cost is saved. Meanwhile, the CFB unit coal feeding system is beneficial to general layout.

Description

technical field [0001] The invention relates to a coal delivery system of a CFB unit. Background technique [0002] Conventional boiler technology in thermal power plants, in order to ensure the safe coal supply of the boiler, a raw coal bunker that meets the 8-hour coal consumption of the CFB unit is installed within the frame of the coal bunker in the main workshop. The circulating fluidized bed CFB boiler developed on the basis of the conventional boiler follows the habit of setting the raw coal bunker for the 8-hour coal consumption of the CFB unit in the coal bunker of the main workshop. [0003] Since the CFB boiler silo burns low-quality coal, its coal consumption is much greater than that of conventional boilers, resulting in an increase in the volume of the raw coal bunker by about 20%, and the height of the single frame structure between the coal bunkers is constantly increasing. At the same time, the increased volume of raw coal bunkers also leads to the continuo...

AI Technical Summary

Problems solved by technology

[0004] The existing technology mainly has the following disadvantages: the raw coal bunker built in the coal bunker of the main powerhouse meets the 8-hour coal consumption of the CFB unit, the reserve of the 300MW unit is 1800t (3000t for the 600MW unit), and the project investment in the coal bunker of the main powerhouse is large

The setting of the original coal bunker makes the elevation of the belt layer between the coal bunkers 40m (51m), the process route of the coal transportation system increases, and the project investment is large

At the same time, the current GB50011-2001 "Code for Seismic Design of Buildings" has many restrictions on the structure and height of reinforced concrete single-frame structures, and the project investment of double-frame structures in the coal bunkers of the main workshop will greatly increase

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