Test based critical ignition temperature determination method
A technology of ignition temperature and determination method, which is applied in the investigation phase/state change and other directions, can solve the problems of destroying the airflow field, unfavorable stable ignition, and large ignition heat, and achieves energy saving, energy consumption reduction, and energy efficiency improvement. Effect
Active Publication Date: 2013-08-28
XI AN JIAOTONG UNIV
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Problems solved by technology
[0004] (1) The lower the volatile content of the combustible base of coal, the higher the ignition temperature, the greater the moisture and ash content in the coal, and the greater the required ignition heat, which is not conducive to ignition;
[0005] (2) Operating factors also have a great influence on the ignition, for example, if the primary wind speed is too high, the ignition point will be delayed;
[0007] (4) The secondary wind speed is moderate, if it is too large, the air flow field will be destroyed, which is not conducive to stable ignition;
[0014] It can be seen that the calculation of the ignition temperature of pulverized coal has always been a research hotspot, but many people's methods are more complicated, the operation cost is high, and it is inconvenient
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[0032] The method and its application will be further described in detail below.
[0033] In this method, the relationship between the volatile matter and the critical ignition temperature is inversely proportional, and the other parameters have a linear relationship with the critical ignition temperature, that is
[0034] T cr = av 1 + bv 2 + ct 1 + dc + eQ + f V hf + g - - - ( 1 )
[0035] In the formula, T cr ——Critical ignition temperature / °C.
[0036] v 1 ——Primary wind speed / m·s -1 ;
[0037] v 2 ——Secondary wind speed / m·s -1 ;
[0038] t 1 ——Primary air temperature / °C;
[0039] c—...
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A test based critical ignition temperature determination method comprises the following steps: changing operation parameters comprising primary air speed, secondary air speed, air powder concentration and the like several times during the combustion of different coals in a boiler when low-load stable combustion tests of the power plant boiler are carried out to obtain the critical ignition temperatures of a plurality of coals under different conditions, recording the above data, and fitting to obtain a fitting formula between the critical ignition temperatures and all influence factors. The method can realize real-time calculation of the critical ignition temperature, guarantees the hearth temperature above the critical ignition temperature, and is of great significance to the safe operation of the boiler and the effective energy utilization.
Description
technical field [0001] The invention belongs to the field of energy saving and emission reduction, and in particular relates to a test-based method for determining the critical ignition temperature. Background technique [0002] my country has now become the second largest energy-consuming country in the world. The high energy consumption has brought many problems, and it is very important to improve the utilization rate of energy. Coal is mainly used in power generation in my country. When the coal quality fluctuates greatly or the boiler operates at low load, if the combustion adjustment is not timely, it may cause the furnace to extinguish the fire, especially at low load. Furnace fire extinguishing, oil gun operation is often earlier, resulting in waste of energy. Therefore, it is necessary to grasp the safety margin of the furnace flame temperature in real time to ensure that the furnace temperature is above the critical ignition temperature. Therefore, real-time calcul...
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IPC IPC(8): G01N25/12
Inventor 谭厚章杜文智
Owner XI AN JIAOTONG UNIV