Circulating fluidized bed boiler purely burning high-sodium-potassium fuel and operation method of circulating fluidized bed boiler purely burning high-sodium-potassium fuel

Abstract

The invention discloses a circulating fluidized bed boiler purely burning high-sodium-potassium fuel and an operation method of the circulating fluidized bed boiler purely burning the high-sodium-potassium fuel. The circulating fluidized bed boiler comprises a hearth, a separating and material returning unit, a steam cooling flue and a tail vertical shaft flue, wherein the separating and materialreturning unit is connected with a flue gas outlet of the hearth and is used for separating and returning materials in the flue gas, the steam cooling flue is connected with a flue gas outlet of the separating and material returning unit, the steam cooling flue is divided into a downstream steam cooling flue and an upstream steam cooling flue in the width direction, the downstream steam cooling flue and the upstream steam cooling flue are arranged in parallel and communicate, the downstream steam cooling flue is an empty flue, at least a water cooling pipe bundle is arranged in the upstream steam cooling flue, and the tail vertical shaft flue is connected with a flue gas outlet of the upstream steam cooling flue, and the operation method adopts the circulating fluidized bed boiler purely burning the high-sodium-potassium fuel. According to the circulating fluidized bed boiler purely burning high-sodium-potassium fuel and the operation method of the circulating fluidized bed boiler purely burning the high-sodium-potassium fuel, by controlling the inlet smoke temperature of a tail superheater, contamination of the heating surface can be reduced, pure combustion of the high-sodium-potassium fuel is achieved, and large-scale development and utilization of Xinjiang coal and energy development of Xinjiang are facilitated.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, more specifically, to a circulating fluidized bed boiler purely burning high-sodium potassium fuel and its operating method. Background technique [0002] The Xinjiang Uygur Autonomous Region is located in the northwestern border of the motherland, with a total area of ​​1.66 million square kilometers, accounting for about one-sixth of my country's total land area. Its coal resources are predicted to be 2.19 trillion tons, accounting for 40.6% of the country's total coal resources. Ranked first in the country. The overall endowment conditions of coal resources in Xinjiang are good, the coal seam is thick, and the development cost is low. According to the distribution of coal resources in Xinjiang and the development strategy of Xinjiang resources, Xinjiang plans four major coalfields, Zhundong, Tuha, Ku-bai, and Yili, as Xinjiang's coal power, "West The main base of coal...

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Problems solved by technology

[0004] Zhundong coal is an excellent power coal with ultra-low ash, ultra-low sulfur, high calorific value (high calorific value), and low degree of metamorphism. It has extremely strong fouling and slagging characteristics, but the existing pulverized coal furnace and circulating fluidized bed boiler technology have not solved the problem of slagging on the water wall of the boiler and fouling and ash on the convective heating surface, which seriously affects and restricts the boiler safe, stable and continuous operation

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