Method for predicting wear rate of radiant tube of downer rapid pyrolysis furnace

Abstract

The invention relates to a method for predicting the wear rate of a radiant tube of a downer rapid pyrolysis furnace. The method comprises the steps: 1) performing geometric modeling of a pulverized coal pyrolysis furnace device; 2) adopting an MP-PIC method to perform geometric model meshing, and setting an initial flow field and boundary conditions; 3) using the MP-PIC method to simulate and extract the instantaneous particle velocity and erosion angle; 4) using a wear model to calculate the instantaneous wear rate of the radiant tube, and taking the wear rate corresponding to the particle velocity and erosion angle as basic data; 5) adopting a neural network to train the basic data, to obtain a wear rate model; (6) according to the wear rate model, predicting the wear rate, and obtaining the instantaneous wear amount. According to the method for predicting the wear rate, the MP-PIC method is adopted; by coupling with an artificial neural network method, the instantaneous wear amountof the radiant tube is predicted on line, the accumulated wear amount is monitored, the wear conditions of the radiant tube are judged, the maintenance of the radiant tube is timely and effectively guided, and it is ensured that the heat accumulating type rapid pyrolysis furnace runs safely and stably.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a method for predicting the wear rate of a radiant tube of a pyrolysis furnace. Background technique [0002] my country is rich in carbon-containing low-grade energy and waste resources, mainly including low-rank coal, biomass, oil shale, waste tires, sludge, etc., and my country's oil and gas resources are scarce, and imported crude oil is increasing every year. According to statistics In 2013, my country's crude oil imports reached 280 million tons, and its dependence on foreign crude oil continues to increase. Based on this, a regenerative downward fast pyrolysis reactor adopts regenerative radiant tube arrangement technology without using heat carrier, which has simple process, reliable operation, and easy realization of large-scale, which can meet the requirements of industrial operation. At the same time, artificial petroleum and natural gas resources can be...

AI Technical Summary

Problems solved by technology

[0003] However, during the operation of the downward pyrolysis furnace in a long-term high-temperature environment, the pyrolysis raw material is powder, such as coal powder, and the violent downward movement of the coal powder particles in the pyrolysis furnace may cause radiation of key components that provide heat sources in the pyrolysis furnace Tube erosion and wear

When the amount of wear on the surface of the radiant tube reaches a certain level, it will not be able to withstand the impact of the particles in the furnace on its surface. Once the material on the surface of the radiant tube is worn out, the particles will penetrate the radiant tube and seriously affect the fast pyrolysis furnace device. High efficiency and long-term safe and stable operation, resulting in unsafe factors and large economic losses

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