Method for calculating steel ball loading capacity of coal mill in thermal power generation boiler

Abstract

A method for calculating the steel ball loading capacity of a coal mill in a thermal power generation boiler comprises the steps that the calculation equation of the steel ball loading capacity m of the steel ball coal mill is k4*mk5+k6*mk5-1=k7*I / (Bm*h), wherein m is the steel ball loading capacity of the steel ball coal mill, h is a raw coal blending HGI hardness coefficient of a coal pulverizing system and a boiler combustion system, I is current of the steel ball coal mill, Bm is output of the steel ball coal mill, and k4, k5, k6 and k7 are undetermined coefficients; the problem that in the production site, raw coal blending hardness cannot be obtained can be effectively solved; meanwhile, according to online data of the current and the output of the steel ball coal mill, the steel ball loading capacity of the running steel ball coal mill can be rapidly evaluated, running maintenance persons can be guided to reasonably organize steel ball loading of the coal mill according to the optimum steel ball loading amount of the coal mill, and therefore the output of the steel ball coal mill can be effectively improved; and the current of the steel ball coal mill is controlled, running parameters of the coal pulverizing system can be optimized in an online manner, the economy of the coal pulverizing system of the thermal power generation boiler can be improved, and the effects of saving energy and reducing the consumption are achieved.

Description

1. Technical field [0001] The patent of the present invention relates to a method for calculating the steel ball load of a coal mill, especially a calculation method for the steel ball load of a coal mill used in thermal power boilers. 2. Background Technology [0002] The safety and economy of thermal power plant unit operation mainly depend on the boiler system, and the factor that affects the safety and economy of boiler system operation is the coal-fired pulverization system of the boiler. The task of the thermal power plant pulverization system is to set it as a boiler Provide pulverized coal that meets the combustion requirements in quantity and quality. The existing pulverized coal preparation systems of thermal power generation enterprises are mainly divided into the following categories: (1) medium storage steel ball coal mill system; (2) direct blowing double-inlet and double-outlet steel ball coal mill system; (3) direct blowing type Medium speed pulverizer syste...

AI Technical Summary

Problems solved by technology

A large load of steel balls will increase the output of the coal mill, but the current of the coal mill will also increase at the same time, and a small load of steel balls will cause a decrease in the output of the coal mill, but the current of the coal mill will also decrease at the same time

At present, the thermal power plants mainly have the following two problems in improving the output of the steel ball coal mill and controlling the current of the coal mill: First, there is a coupling between the hardness of the raw coal entering the steel ball coal mill to be ground and the output of the steel ball coal mill relationship, but currently domestic thermal power plants generally use different coal types for blending, and the hardness data of the blended coal cannot be obtained at the production site

Secondly, there is a coupling relationship between the steel ball load of the steel ball coal mill and the output of the steel ball coal mill, but the steel ball load is only weighed when it is installed for the first time or reinstalled after overhaul and disintegration. cannot weigh

At the same time, due to the inability to know the accurate steel ball loading data, the operation and maintenance personnel generally adopt the method of adding a large number of steel balls at long intervals when the steel ball coal mill is in normal operation, so that it is impossible to ensure that the steel ball coal mill maintains the best steel ball Loading;

[0004] In order to ensure the safety of thermal power plant unit operation and improve its economy, it is of great significance to calculate and control the steel ball loading of the coal mill in the thermal power boiler, so it is used for the coal mill in the thermal power boiler The calculation method of the steel ball loading is an important calculation method, and there is no calculation method for the steel ball loading of the coal mill in the thermal power boiler