Design control method of boiler furnace outlet gas temperature

Abstract

The invention discloses a design control method of a boiler furnace outlet gas temperature. The design control method comprises the following steps: 1, testing the ash fusion property DT and ST of a coal sample according to the national standard GB / T219-2008, and testing the ash compositions Na2O, K2O, CaO and Fe2O3 of the coal sample according to the national standard GB / T1574-2007; 2, calculating the initial slagging temperature Ts0, wherein Ts0=3.57(18-Ki) +1025, the potassium, sodium, calcium and iron index Ki=(K2O+Na2O)2+0.048(Fe2O3+CaO), and each molecular formula represents the coal ashcomposition weight of the compound represented by the above measured molecular formula; and 3, enabling the boiler furnace outlet gas temperature FEGT to meet the following condition: (a), FEGT is less than Ts0; (b), FEGT is less than DT-100; and (c), FEGT is less than ST-150. With adoption of the design control method, the design control index with higher precision and suitable for the boiler furnace outlet gas temperature is obtained according to the conventional available coal quality data to provide technical base for design and operation of a power station boiler.

Description

technical field [0001] The invention relates to a method for designing and controlling the flue gas temperature at the boiler furnace outlet, in particular to a method based on the initial slagging temperature as the design and control index for the flue gas temperature at the boiler furnace outlet. Background technique [0002] my country's Xinjiang Zhundong Coalfield reserves nearly 390 billion tons, and it is the largest integrated coalfield discovered in my country so far. As one of the nine 10 million-kilowatt coal power bases in my country, the Zhundong area is the national development strategy and the "Belt and Road" energy core area, the national "Xinjiang power transmission" base, and the national large-scale coal coal power coal chemical industry demonstration zone , has the advantage of building a 100 million-ton coal production and deep processing base. The coal in the Zhundong area is basically high-alkali coal, which has low ignition temperature, high burnout r...

AI Technical Summary

Problems solved by technology

However, due to the particularity of high-alkali coal, the CaO content in the ash component is relatively high. Although the ash melting point is high, there are also serious slagging and contamination phenomena. Only the ash melting point is used as the control index of the flue gas temperature at the furnace outlet. Unable to meet boiler anti-slagging requirements

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