Layered monitoring method for ash deposition of rotary air preheater based on finite difference method

Abstract

The invention discloses a layered monitoring method for ash deposition of a rotary air preheater based on a finite difference method, and the method comprises the steps: collecting DCS data of a power plant, constructing an equation set through a finite difference method, solving the equation set by combining actual structure parameters of a preheater of the power plant and employing the DCS data as a boundary condition to obtain the temperature distribution of a rotor, therefore, the dust deposition condition is monitored. Meanwhile, holes are innovatively formed in the rotor and a stator to increase measuring points, real-time layered monitoring of the ash deposition condition of a heat storage element is finally achieved, the method can be used for a rotary air preheater with any bin number and layering number, combination of macroscopic monitoring and layered monitoring is achieved, and effective guidance is provided for ash deposition of a power plant.

Description

technical field [0001] The invention belongs to the technical field of boiler ash accumulation monitoring, and in particular relates to a method for monitoring ash accumulation layers of a rotary air preheater based on a finite difference method. Background technique [0002] Rotary air preheater has been widely used in coal-fired power plants. The preheater can heat the primary air and secondary air sent into the furnace through flue gas, thereby increasing the temperature of the furnace, improving combustion conditions, and ensuring ignition under low load. stability. Due to the presence of excess ammonia, sulfur trioxide, water vapor and other substances in the upstream flue gas, ammonium bisulfate is easily formed in the slit of the corrugated plate of the rotary air preheater, which sticks more fly ash and leads to channel blockage. When the accumulation of dust increases, the heat transfer capacity of flue gas, air and heat storage elements decreases, reducing the hea...

AI Technical Summary

Problems solved by technology

[0003] At present, power plants often use differential pressure, inlet and outlet temperatures, or worker experience to stop inspections and clean dust. Difficulty with ash, damage to heat storage elements, etc.

Previously, there were other methods for monitoring dust accumulation, but most of them were for monitoring the overall condition of the air preheater, and did not carry out layered monitoring

Images