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Method for establishing air pre-heater clean factor calculation model by using smoke pressure difference, and application

A cleaning factor and calculation model technology, applied in the field of establishing the calculation model of the air preheater cleaning factor, can solve the problems that cannot reflect the change of the area coefficient, the dust blocking of the air preheater, etc., so as to improve the calculation speed and simplicity, and reduce the operating cost. cost, the effect of improving safety and economy

Inactive Publication Date: 2015-11-18
SOUTHEAST UNIV
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Problems solved by technology

However, since the differential pressure of an air preheater is proportional to the square of the flow rate, the change in differential pressure is largely affected by the flow rate
The direct use of pressure difference to calculate the cleaning factor can only reflect the size of the resistance, but not the change of the area coefficient
With the extensive promotion of SCR technology in domestic units, the serious problem of soot blocking in the air preheater has not been effectively solved, and the development of a special soot blowing optimization system for the air preheater is imminent

Method used

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  • Method for establishing air pre-heater clean factor calculation model by using smoke pressure difference, and application
  • Method for establishing air pre-heater clean factor calculation model by using smoke pressure difference, and application
  • Method for establishing air pre-heater clean factor calculation model by using smoke pressure difference, and application

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Embodiment Construction

[0059] The present invention proposes a method for establishing an air preheater cleaning factor calculation model using the flue pressure difference method, comprising the following steps:

[0060] Step 1: First convert the actual measured pressure difference under different loads and excess air coefficients to the calculated value under the rated load, the calculation formula is as follows:

[0061] Δp z s = Δ p ( α 0 α × N 0 N ) 2 - - - ( 1 )

[0062] Among them, Δp ZS Represents the converted pressure difference, unit Pa; Δp represents the me...

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Abstract

The present invention discloses a method for establishing an air pre-heater clean factor calculation model by using smoke pressure difference, and the method includes: converting an actual measuring pressure difference under conditions of different loads and an excess air coefficient into calculated values under conditions of rated loads, and further establishing the air pre-heater clean factor calculation model. The present invention also discloses an application of the above calculation model to monitoring of fouling conditions of the air pre-heater of a coal-fired boiler SCR denitrification system. According to a formation principle of fouling of the air pre-heater of the SCR denitrification system and a growth form, a fouling monitoring model of the air pre-heater of the denitration boiler is established, wherein the fouling monitoring model integrates data collection, fouling condition monitoring, and diagnosis. The method provided by the present invention can accurately predict fouling conditions of the air pre-heater, meet accuracy requirement of engineering application, guide a soot blower to blow soot timely, eventually achieve demand soot blowing of tail heating surface, improve economy and safety of generator operation, and can provide a technical reference for domestic same-type generators.

Description

technical field [0001] The invention relates to the field of thermal automation, and in particular discloses a method for establishing a calculation model of an air preheater cleaning factor by using a smoke pressure difference method. Background technique [0002] my country's coal-dominated energy structure has resulted in high total emissions of air pollutants, and the problem of regional air pollution has become increasingly apparent. As the main pollutant, nitrogen oxides have been listed as key binding indicators. The Yangtze River Delta region is a key control area. According to the latest "Emission Standards of Air Pollutants for Thermal Power Plants", coal-fired units in the thermal power industry have implemented new emission limits for nitrogen oxides from thermal power boilers and gas turbines since July 2014: 100mg / m 3 . [0003] After the boiler is equipped with SCR denitrification device, the air preheater is seriously blocked by ash, the flue gas flow rate...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陶成飞王明春
Owner SOUTHEAST UNIV
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