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

A technology of coal quantity into the furnace, double input and double output, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem that the instantaneous coal quantity cannot be directly measured, coal quantity is inconsistent, Affecting the concentration of wind powder and other issues to achieve the effect of improving safety and economy, practicality and simplicity, and low investment

Active Publication Date: 2016-08-31
STATE GRID CORP OF CHINA +1
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  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0038] The following is an example of a 600MW subcritical coal-fired power generation unit. The unit is equipped with 5 double-inlet and double-outlet coal mills, namely A, B, C, D, and E coal mills. The wind power of each coal mill The powder outlet is divided into a driving end and a non-driving end. The primary air at each end enters the corresponding burner through four primary air pipes for combustion. Taking the driving end of A coal mill as an example, the primary air entering the furnace includes capacity air and bypass wind, the flow signal is Q r , Q p , and the corresponding temperature signals are t r , t p , the measuring point of the air powder concentration is arranged on each primary air duct, denoted as ρ a1 , ρ a2 , ρ a3 , ρ a4 , The control of the main steam pressure of the boiler is mainly adjusted by the amount of coal fed into the furnace.

[0039] Step 1: Primary Air Volume Measurement and Calculation

[0040] Taking the driving end of coal mill ...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 孟祥荣姚常青周长来
Owner STATE GRID CORP OF CHINA
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