Online detection method for thickness of ring forming material of pellet rotary kiln

Abstract

The invention relates to an online detection method for the thickness of a ring forming material of a pellet rotary kiln. The method comprises the following steps of: continuously measuring the temperature of a furnace shell of the rotary kiln to obtain a temperature value I; discontinuously measuring the temperature in the rotary kiln to obtain a temperature value II; marking a state in which the rotary kiln is put into use for the first time after maintenance as a state I, marking a state in which the rotary kiln runs for a period of time as a state II, respectively measuring a temperature value I and a temperature value II in the state I and a temperature value I and a temperature value II in the state II, and introducing each temperature value into a heat flow intensity calculation formula that Q = h (dT / dL), and correcting the heat flow intensity by introducing a modification coefficient lambda, and measuring the thickness of the ring forming material. According to the method, the condition of the rotary kiln can be monitored on line under the condition that the rotary kiln is not stopped, manpower and financial resources are saved; and the method is simple and easy to implement and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of pellet production, in particular to an on-line detection method for the thickness of ring material in a pellet rotary kiln. Background technique [0002] During the production process of the pellet rotary kiln, due to the rough surface of the refractory material on the inner surface of the rotary kiln, the high content of pellet powder, the high addition of bentonite, etc., and insufficient preheating of the pellets, under high temperature conditions, from the pellet surface The shedding powder and low-melting point substances are easy to adhere to the surface of the refractory material. With the rotary motion of the rotary kiln, a circle of cohesive substances (mainly composed of low-melting point olivine phase and recrystallized red Composition of iron ore), known as ring material, needs to be cleaned regularly. [0003] After the ringing phenomenon occurs, a dense ringing material composed of recrysta...

AI Technical Summary

Problems solved by technology

[0007] In order to grasp the ring formation in the oxidation pellet rotary kiln, it is necessary to monitor the ring formation status of the rotary kiln in real time. However, there is no real-time monitoring of the ring formation in the rotary kiln. There is a precedent for monitoring. Most of the existing technologies only measure the temperature of the outer surface of the rotary kiln to estimate the ringing situation in the kiln. However, this method cannot accurately understand the specific thickness of the ringing material, and it is impossible to know the ringing material. The thickness variation trend of