Method for measuring and calculating air leakage rate of air preheater of multi-fuel combustion boiler powered by combusting pulverized coal and blast-furnace gas

Abstract

The invention discloses a method for measuring and calculating air leakage rate of an air preheater of a multi-fuel combustion boiler powered by combusting pulverized coal and blast-furnace gas. The method is mainly used for accurately solving the air leakage rate of the air preheater of the multi-fuel combustion boiler powered by combusting the pulverized coal and the blast-furnace gas. The method for measuring and calculating the air leakage rate of the air preheater of the multi-fuel combustion boiler powered by combusting the pulverized coal and the blast-furnace gas comprises the following steps of acquiring basic data required for calculation of the air leakage rate; acquiring the density of blast-furnace coal gas in a standard state; converting ingredient data of the blast-furnace coal gas into ingredient data which are expressed by mass content percentages as received basis; acquiring mixed fuel characteristic data; and performing calculation to respectively acquire the theoretical amount of dry air required for combustion of mixed fuels in unit mass, the actual amount of dry smoke corresponding to an inlet and an outlet of the air preheater respectively, excess air coefficients corresponding to the inlet and the outlet of the air preheater respectively and the air leakage rate of the air preheater of the multi-fuel combustion boiler powered by combusting the pulverized coal and the blast-furnace gas. By the method, the air leakage rate of the air preheater of the multi-fuel combustion boiler powered by combusting the pulverized coal and the blast-furnace gas can be accurately analyzed, measured and calculated.

Description

technical field [0001] The invention relates to the boiler field of thermal engineering, in particular to a method for measuring and calculating the air leakage rate of an air preheater of a boiler co-fired with pulverized coal and blast furnace gas. Background technique [0002] Iron and steel enterprises produce a large amount of by-product gas during the smelting process, including blast furnace gas, coke oven gas and converter gas. Among them, the output of blast furnace gas is the largest, and each 1t of pig iron smelted can produce 3500-4000m3 3 blast furnace gas. Non-combustible components in blast furnace gas (including N 2 and CO 2 ) content as high as about 80%, resulting in the low calorific value of blast furnace gas, non-combustible and other shortcomings, resulting in insufficient utilization of blast furnace gas in many iron and steel plants. How to make good use of the by-product blast furnace gas resources in the iron and steel production process is a com...

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Problems solved by technology

However, this method is an empirical method deduced for conventional coal-fired boilers, which is suitable for conventional coal-fired boilers, but not suitable for co-fired boilers with pulverized coal and blast furnace gas (this is mainly because the fuel composition of blast furnace gas is very different from coal. There is a big difference, which leads to the solution process of the air leakage rate of the air preheater of the pulverized coal and blast furnace gas co-fired boiler is very different from the conventional coal-fired boiler, which is much more complicated than the conventional boiler), if the method in the national standard GB10184-88 is still applied, it will inevitably Will cause the results to deviate greatly from the true value, thus losing validity

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