A method for measuring the instantaneous amount of coal fed into the furnace by a double-inlet and double-outlet coal pulverizer

Abstract

The invention discloses a method for measuring the instant as-fired coal amount of a double-inlet double-outlet coal mill. The method comprises the following steps: 1, measuring the flow of primary air entering an air powder mixing pipeline by a flow measurement device; 2, mounting an air powder concentration measurement device on each primary air pipeline of a corresponding burner, and measuring the air powder concentration by the device; 3, measuring a scale factor K, adjusting the running conditions of the coal mill to stabilize the coal feeding amount, the material level, the air powder concentration and a primary air flow signal, obtaining an average signal value of the primary air flow and the air powder concentration through real-time data, and substituting the coal feeding amount of the coal mill into a formula to obtain a K value; 4, substituting results obtained from the steps (1), (2) and (3) into the formula to obtain the instant as-fired coal amount of the double-inlet double-outlet coal mill; F=K*Q*rho. According to the method, the problem of incapability of directly measuring the instant as-fired coal amount of a double-inlet double-outlet milling system is solved through an intermediate signal generation method by fully utilizing existing measurement technologies and measurement equipment.

Description

technical field [0001] The invention relates to a method for measuring the instantaneous amount of coal into the furnace, in particular to a method for measuring the instantaneous amount of coal into the furnace for a double-inlet and double-outlet coal mill. Background technique [0002] The main goal of boiler control for coal-fired units is to stabilize the main steam pressure. The main steam pressure control is to adjust the amount of fuel entering the boiler to make the boiler calorific value adapt to the external electrical load requirements of the unit, so as to ensure the stability of the main steam pressure. The heat generated by the boiler is directly related to the amount and quality of coal entering the furnace. The quality of coal is directly determined by the coal entering the plant and cannot be controlled. In addition, under normal circumstances, the basic stability of coal quality can be ensured by blending coal. Therefore, the coal entering the furnace Accu...

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Problems solved by technology

Secondly, due to changes in boiler instructions, the primary air baffle needs to be continuously adjusted, and the corresponding changes in the powder level of the pulverizer bin will also affect the concentration of air powder, resulting in the inconsistency between the instantaneous primary air volume and the instantaneous instantaneous coal input into the furnace

Therefore, the instantaneous coal quantity of the double-inlet and double-outlet coal mill cannot be directly measured, and can only be calculated by constructing an intermediate signal

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