Method for calculating in-boiler coal amount of pulverized coal and blast furnace gas multi-fuel-fired boiler
A technology for burning coal and blast furnace gas into the furnace, applied in calculation, special data processing applications, instruments, etc., can solve problems such as the difficulty of solving the thermal efficiency of the boiler, and the difficulty of accurately obtaining the amount of coal burned into the furnace
Active Publication Date: 2014-08-27
HUATIAN ENG & TECH CORP MCC
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Problems solved by technology
For boilers equipped with direct-blowing pulverizing system, the amount of coal fed to the boiler measured by a belt weighing coal feeder can be used as the amount of coal fired into the boiler; for boilers configured with intermediate storage pulverizing system, due to the final The amount of pulverized coal in the furnace is not equivalent to the amount of coal fed into the coal mill. It is difficult to accurately obtain the amount of coal burned in the furnace under the corresponding working conditions through direct measurement. At present, most of the pulverized coal mixed with blast furnace gas Boilers are equipped with intermediate storage pulverizing systems, which brings great difficulties to the calculation of boiler thermal efficiency
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[0037] The present invention will be further described below in conjunction with the accompanying drawings.
[0038] The method for measuring and calculating the amount of coal fired into the furnace of the pulverized coal and blast furnace gas co-fired boiler of the present invention comprises the following steps:
[0039] Step 1. Obtain various input parameters, which include characteristic data of coal combustion, characteristic data of blast furnace gas, parameters of ash and slag, parameters of dry flue gas, and flow rate of blast furnace gas into the furnace.
[0040] Sampling and analysis of raw coal and pulverized coal: Sampling raw coal and pulverized coal on the coal feeder and pulverized coal sampling pipe respectively, carry out laboratory analysis and calculation processing on the raw coal sample and pulverized coal sample, and obtain the characteristic data of coal combustion. The characteristic data of coal combustion include the mass content percentage of ashes...
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The invention discloses a method for calculating the in-boiler coal amount of a pulverized coal and blast furnace gas multi-fuel-fired boiler. The problem that in the prior art, the in-boiler coal mount corresponding to the working condition can not be accurately acquired in a direct measuring mode for a boiler which is provided with a storage pulverizing system is solved. According to the method, acquired input parameters are used, then step by step computation is conducted, and at last the volume content percentage of three-atom gas in dry flue gas is obtained, the difference value of the calculating value of the volume content percentage of the three-atom gas and a practical measuring value is compared with a preset error range, if the difference value of the calculating value of the volume content percentage of the three-atom gas and the practical measuring value is beyond the preset error range, the in-boiler coal amount is regulated and calculated again until the difference value of the calculating value and the practical measuring value is within the preset error range, and the practical in-boiler coal amount is determined. The method solves the difficult problem that the in-boiler coal amount can not be calculated accurately in the boiler which is provided with the storage pulverizing system, and therefore the thermal efficiency of the pulverized coal and blast furnace gas multi-fuel-fired boiler can be conducted smoothly.
Description
technical field [0001] The invention relates to a method for measuring and calculating the amount of coal fired into a boiler mixed with pulverized coal and blast furnace gas. Background technique [0002] Iron and steel enterprises produce a large amount of blast furnace gas in the process of smelting. Due to the characteristics of low calorific value, high nitrogen content and poor combustion stability of blast furnace gas, many iron and steel factories currently do not fully utilize blast furnace gas. A large amount of blast furnace gas is It is released, resulting in a waste of energy, so how to make full use of the by-product blast furnace gas resources in the iron and steel production process has become a common concern of relevant technical personnel. [0003] In recent years, pulverized coal and blast furnace gas co-fired boilers have been successfully applied and gradually promoted in some iron and steel plants. By introducing blast furnace gas into pulverized coal ...
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Inventor 江文豪姚群
Owner HUATIAN ENG & TECH CORP MCC