Building method for combustion energy radiant energy signal in coal-fired thermal power generating unit boiler
A technology of thermal power units and radiant energy, applied in combustion methods, safety devices of combustion chambers, combustion chambers, etc., can solve problems such as large pulsation, unstable signal values, and poor reliability, and achieve the effect of eliminating signal deviations
Inactive Publication Date: 2015-09-09
TSINGHUA UNIV +1
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This value can quickly reflect the combustion status of the furnace space and has a strong correlation with the unit. However, the detector is affected by coking, dust accumulation, and lens discoloration during use, and the initial radiant energy signal value will be unstable, with large pulsations and poor reliability. Case
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[0056] The present invention has corresponding hardware and software support, and its specific implementation method is as follows:
[0057] The flame detectors installed at different heights of the furnace obtain the image information of the flame radiation in the furnace. Taking 16 flame detectors divided into 4 layers, each layer of 4 is applied to a 300MW subcritical boiler as an example. Its structure is as follows figure 1 shown.
[0058] First set the parameters of the CCD camera in the flame detector to be fixed to ensure that the image is clear and not saturated, and drive the SDK2000 video acquisition card to complete the acquisition of flame radiation images. The 16-channel video signal is synthesized by the hard disk video recorder into a flame radiation image and sent to the computer system.
[0059] The steps to construct the radiant energy signal are as follows: figure 2 shown. The normal flame image brightness captured by each detector represents the effect...
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The invention discloses a building method for a combustion energy radiant energy signal in a coal-fired thermal power generating unit boiler and belongs to the technical field of thermal power plant boiler combustion monitoring and control. Firstly, image information of combustion flame is obtained through a plurality of flame image detectors arranged on different height positions along a boiler chamber, the grey value of each image is calculated in real time and transformed into a measuring range same as the thermal power generating unit actual generated power and defined as an initial radiant energy signal. Secondly, dynamic compensation data processing is performed on the initial radiant energy signal by the use of the value of the thermal power generating unit actual generated power, and the final radiant energy signal is obtained. Finally, the final radiant energy signal serves as a detection value of energy level in the boiler to be output to a coordinated control system of the thermal power generating unit. The application result shows that the radiant energy signal built by the method can effectively reflect the pulsatility of flame in the boiler chamber, the signal deviation caused by detector ash deposition and coking and other factors is eliminated, and the building method can be suitable for continuous on-line optimal control of thermal power generating units with different types and different capacities.
Description
technical field [0001] The invention relates to a method for constructing combustion energy radiation energy signals in a furnace of a coal-fired thermal power unit, which belongs to the boiler combustion monitoring and control technology of a thermal power plant. Background technique [0002] Using the furnace flame radiation imaging monitoring system to obtain radiant energy signals and accurately reflect the online monitoring technology of the energy released during the combustion process in the furnace (Zhou Huaichun, Principles and Technology of Visual Flame Detection in Furnace, Science Press, May 2005, pp.306 -309) Some achievements have been made in the field of coordinated optimization control of thermal power units. [0003] This technology is to install multiple high-temperature flame image detectors at different heights and positions of pulverized coal combustion boilers, take pictures of flame images in the furnace, and obtain radiant energy signals through imag...
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Inventor 周怀春刘珠伟周远科
Owner TSINGHUA UNIV