Temperature field online estimating method for rotary air-preheater with self-correcting function
An air preheater and self-calibration technology, which is used in instruments, calculations, special data processing applications, etc., and can solve the problems of additional sensors, inability to directly collect, and low acquisition accuracy.
Active Publication Date: 2014-07-09
SHANGHAI JIAO TONG UNIV
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This method requires real-time collection of parameters such as flow velocity, density, specific heat, thermal conductivity, heat transfer coefficient, etc. Some of these parameters cannot be collected directly, and some collection accuracy is not high, and additional sensors need to be installed
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[0044] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0045] Taking the calculation of the online temperature field distribution of a Junker type three-compartment air preheater as an example, as follows:figure 1 As shown, the air preheater model is 28.5-VI(T)-1780-SMR, the preheater is arranged vertically, the flue gas flow direction is from top to bottom, the air flow direction is from bottom to top, the total height of heat transfer elements is 1780mm, and the rotor adopts Semi-modular design structure, conventional circular shell, and flexible con...
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The invention provides a temperature field online estimating method for a rotary air-preheater with a self-correcting function. The method includes that step 1, air-preheater structure parameters are obtained according to a boiler operation design discipline; step 2, N groups of operation data before the current moment is read from a DCS control system real-time data base, N groups of air convective heat transfer coefficient correction factors and metal wall rotation carried heat augmentation correction factors are obtained through a simplex parameter identification method and subjected to arithmetic average to obtain average correction factors; step 3, operation data of the current moment is read from the real-time data base of the DCS control system, according to two average correction factors and an air-preheater temperature field calculation model obtained from the step 2, three-dimensional temperature distribution of each branch warehouse is calculated and output, the average value is calculated and used for conducting step 4; step 4, conditions for returning to the step 2 are determined. The method is used for monitoring air-preheater operation conditions online, dirt clearing is guided, and energy efficiency optimization and safety production of a thermal power unit are facilitated.
Description
technical field [0001] The invention relates to the field of thermal power control, in particular to an online estimation method for the temperature field of a rotary air preheater with a self-correcting function. Background technique [0002] The rotary air preheater is widely used in thermal power plants to improve the thermal efficiency of the boiler. It uses the boiler exhaust gas to heat the primary air and secondary air, and is an important heating surface at the boiler tail. In actual operation, due to its own structure and working environment, the air preheater has problems such as low-temperature corrosion, dust accumulation pollution, and air leakage. The above problems are related to the heat transfer process of the air preheater: the accurate calculation of the metal temperature field can quantify the radial distance The thermoelastic deformation of the plate helps to optimize the radial seal design of the rotor; the accurate calculation of the fluid temperature ...
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IPC IPC(8): G06F19/00
Inventor 胡斌袁景淇徐亮于彤曾豪骏于云潇刘欣
Owner SHANGHAI JIAO TONG UNIV