Method for calculating powder output of double-inlet and double-outlet coal mill

A double-input, double-outlet, calculation method technology, applied in the direction of grain processing, etc., can solve problems such as large fluctuations in material level, deviation of pulverized coal, and clogging of separators.

Active Publication Date: 2014-05-28
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, the separator of the double-inlet and double-outlet steel ball coal mill is prone to clogging, and often needs to be stopped and cleaned frequently
At the same time, due to the large fluctuation of the material level in the cylinder, the amount of coal entering the furnace calculated by the primary air volume has a large deviation from the actual amount of pulverized coal entering the furnace.

Method used

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  • Method for calculating powder output of double-inlet and double-outlet coal mill
  • Method for calculating powder output of double-inlet and double-outlet coal mill
  • Method for calculating powder output of double-inlet and double-outlet coal mill

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Embodiment Construction

[0032] Such as figure 1 As shown, the calculation method of the powder output of the double-inlet and double-outlet pulverizer of the present invention comprises the following steps:

[0033] A: Constructing a pulverized output model of a double-inlet and double-outlet pulverizer

[0034] Among them, M out (t) is the powder output of the coal mill at time t, P 2 is the load wind pressure, is the load damper opening, k 0 、k 1 、k 2 、k 3 are undetermined coefficients;

[0035] Constructing the powder output model of double-inlet and double-outlet pulverizer The calculation is mainly carried out through the following steps:

[0036] 1. Firstly carry out load wind mass flow rate Q m Estimates for :

[0037] The load air volume flow Q is related to the wind speed ν flowing through the load air duct and the cross-sectional area S of the air duct, namely

[0038] Q=Sν (1)

[0039] Load air volume flow Q and load air mass flow Q m satisfy the followi...

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Abstract

The invention discloses a method for calculating the powder output of a double-inlet and double-outlet coal mill. The method comprises the following steps: A. constructing a powder output model for the double-inlet and double-outlet coal mill; B, selecting data from a history station of a coal pulverizing system of the coal mill, wherein the selected data meets the three conditions of mass conservation of the coal powder, coal supplying mass conservation and mass conservation of raw coal; C. using the data selected in the step B to train the powder output model for the double-inlet and double-outlet coal mill according to a least square method, and calculating an undetermined coefficient; D. substituting the undetermined coefficient obtained in the step C into the powder output model for the double-inlet and double-outlet coal mill constructed in the step A, and calculating the powder output of the double-inlet and double-outlet coal mill. The powder output of the double-inlet and double-outlet coal mill is accurately calculated, the operation stability and the economic efficiency of a unit are improved, and the load response capability of the unit is also improved.

Description

technical field [0001] The invention relates to the technical field of operation optimization of a double-inlet and double-outlet coal mill, in particular to a calculation method for the powder output of a double-inlet and double-outlet coal mill. Background technique [0002] With the continuous deepening of my country's power industry reform, the operating mechanism of "separation of power plants and power grids, bidding for grid connection" has become inevitable. For each power plant, ensuring the safe and economical operation of the unit and striving to reduce the cost of power generation is the only way to participate in the competition. When the system composition and structure are fixed, the safety and economy of unit operation mainly depend on the safe and economical operation of the boiler. There are many factors that affect the safety and economy of boiler operation, and the combustion rate of the boiler is undoubtedly one of the most important factors. In the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C25/00
Inventor 唐耀华段松涛蔡远利闫乃明昝新王宏伟谈博
Owner STATE GRID CORP OF CHINA
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