Large coal ash storage tank and coal ash storage system

Abstract

The invention relates to a large coal ash storage tank and a coal ash storage system. The coal ash storage system comprises a large coal ash storage tank, a divided fluidization pipeline system and a compressed air source system. The large coal ash storage tank is provided with a hollow tubular structure and comprises a storage tank base part, a storage tank lateral wall and a storage tank top part, wherein a plurality of material discharging ports are arranged on the storage tank base part, and decompression conical partition boards are arranged on the material discharging ports. The divided fluidization pipeline system comprises a multilayer fluidization pipeline arranged on the storage tank lateral wall along the height direction of the storage tank, and a plurality of fluidization nozzles are arranged on the fluidization pipeline. The compression air source system blows air with certain pressure into the storage tank through the divided fluidization pipeline system, so that the coal ash in the storage tank can be fluidized in positive pressure mode. The large coal ash storage tank and the coal ash storage system are simple in structure, less in maintenance working load and high in reliability, fully fluidize the coal ash, greatly reduce and avoid storage accumulation dead angles, prolong the coal ash storage time and enlarge the effective using volume of a storage cabin.

Description

technical field [0001] The invention relates to thermal power generation, in particular to a fly ash storage system of a thermal power plant. Background technique [0002] At present, the capacity of a single fly ash storage tank in a power plant is generally 3500m 3 Below, the storage days shall not exceed 2 days. The adopted coal ash storage tank fluidization and discharge technology can only be applied to the short-term storage of fly ash. If the storage days become longer, the fly ash will easily harden on the bottom of the storage tank, the wall of the storage tank and the area of ​​the discharge port. The work of the storage tank brings great potential safety hazards, for example, when personnel overhaul, the fly ash on the storage tank wall collapses and personnel are buried. [0003] At the same time, the fly ash is piled up in the ash yard, generating serious dust flying and causing great air pollution. Heavy metal substances in fly ash can easily penetrate into...

AI Technical Summary

Problems solved by technology

[0006] The first type of coal ash storage system is the pulverized coal storage tank commonly used in domestic power plants. The disadvantages are: long-term storage of fly ash will easily form compaction in the coal ash storage tank, reducing the effective storage tank capacity and easily forming Potential safety hazard; the fluidization pressure of the Roots fan is low. When the material level is high, the pressure rises, which is easy to form a "jump", the overall fluidization, and high energy consumption

[0007] The second type of coal ash storage system is widely used in Europe. The disadvantages are: high equipment reliability requirements. Since the gasification chute is partly built in the coal ash storage tank, the accuracy and reliability requirements of the central unloading equipment are higher than other systems. The coal ash storage tank has high requirements and high cost; the built-in decompression cone occupies 1 / 4~1 / 5 of the effective volume of the ash storage, wasting a large storage space

[0008] The third type of coal ash storage system is used in a small number of large-scale cement silos and fly ash storage tanks in China. The disadvantages are: the upward discharge is adopted, and there are many dead ends in the coal ash storage tank. The lower part of the coal ash storage tank is about There are 3~4 meters of ash deposits that cannot be removed; the energy consumption of the system is high, and the side wall discharge is used to generate a large positive pressure in the coal ash storage tank. The structural strength of the coal ash storage tank is high, and the energy consumption is large

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