On-line monitoring system and method for calorific value of coals and standard power generating coal consumption indexes in thermal power generating unit

Abstract

The invention relates to an on-line monitoring system and a method for calorific value of coals and standard power generating coal consumption indexes in a thermal power generating unit. The on-line monitoring system and the method solve the problem that existing technologies are not reasonable in design and the like. The method comprises the steps: collecting and preprocessing data module collecting data and preprocessing, judging a current running state of the unit through a steady-state operation situation recognition module of the unit, calculating reheat steam flux share of the unit through a reheat steam flux share calculation module according to heat balance of a high pressure heater, calculating real-time heat output of a boiler through an effective boiler heat absorption calculation module, calculating real-time thermal efficiency of the boiler and calorific value of the coals through a boiler thermal efficiency and coal calorific value calculation module according to heat balance of a boiler unit, and calculating real-time standard power generating coal consumption indexes of the unit through a standard power generating unit coal consumption calculation module according to heat balance of the unit. The on-line monitoring system and the method realize on-line monitoring of the calorific value of the coals and the standard power generating coal consumption indexes in the thermal power generating unit, and provide important evidence for real-time operation, optimal adjustment of the thermal power generating unit.

Description

technical field [0001] The invention belongs to the field of energy equipment, and in particular relates to an on-line monitoring system and method for thermal power unit coal combustion calorific value and power generation standard coal consumption index. Background technique [0002] With the active development of energy saving and consumption reduction in thermal power enterprises, the economic operation of thermal power units has been paid more and more attention. The standard coal consumption of thermal power units is the key performance index of thermal power units, which comprehensively reflects the economics of unit operation. The standard coal consumption of thermal power units in operation is monitored online, and the economic performance of thermal power units is analyzed in real time. It is of great practical significance and considerable necessity to optimize and adjust the unit to make the unit operate under the best working condition. [0003] However, in ord...

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Problems solved by technology

Under the current circumstances, it is very unrealistic to spend a lot of money to purchase this kind of instrument, and this kind of instrument is still in the development stage, and its performance and stability are not yet mature.

[0004] In addition, the calculation results of the thermal power unit’s economic evaluation indicators can accurately reflect the true level of the unit only under stable conditions. If the unit is under variable load conditions, the calculation results often have a certain degree of deviation. Therefore, how to accurately judge thermal power The operating state of the unit is also one of the problems that must be solved for online monitoring of standard coal consumption in power generation

[0005] In order to solve the above problems, people have carried out long-term exploration. For example, a Chinese patent discloses a method for online monitoring of coal-fired calorific value and coal consumption rate indicators of thermal power plant units [Application No.: 201510515856.7]. Through the specific calculation method, the coal-fired calorific value and coal consumption rate index of the unit in normal operation can be accurately determined, which solves the problem that the coal-fired calorific value and coal consumption rate index of the unit in normal operation cannot be accurately monitored

Through a specific calibration and calculation method, the online calculation of coal consumption rate is realized. However, in this method, the ASME code is used to calculate the boiler efficiency, and the high calorific value and elemental analysis value of coal combustion are needed. On the one hand, thermal power plants usually do not have these components. On the other hand, online testing cannot be done, and there is also a serious time lag

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