A kind of method for stabilizing the specific surface area of ​​milled powder

Abstract

The invention discloses a method for stabilizing a specific surface area of grinding powder, and belongs to the technical field of cement roller press pregrinding. The method comprises the steps as follows: S1, acquiring the specific surface area of the grinding powder and a rotating speed of a powder concentrator, S2, determining pure lag time and inertia process duration from adjustment of the rotating speed of the powder concentrator to variation of the specific surface area of the grinding powder, S3, determining a prediction time domain and a control time domain, S4, establishing an optimization objective function and solving the optimization objective function to obtain optimal variation quantity of the rotating speed of the powder concentrator within the control time domain, S5, calculating a control value of the rotating speed of the powder concentrator in a next step to control operation of the powder concentrator, and S6, substituting a measured value of the rotating speed of the powder concentrator in a next step and a feedback value of the specific surface area of the grinding powder in a next step into the optimization objective function at a next moment and then circularly performing S4-S5. According to the method, the rotating speed of the powder concentrator is adjusted in real time by variation quantity of the specific surface area of the grinding powder and a rotating speed of a circulating fan, so that the specific surface area of the grinding powder is stabilized near a set value; and smooth operation of equipment is facilitated.

Description

technical field [0001] The invention relates to the technical field of cement roller press pre-grinding, in particular to a method for stabilizing the specific surface area of ​​a milled powder body. Background technique [0002] The working purpose of the roller press pre-grinding system is to grind relatively coarse raw materials (mainly clinker, mixed with a certain amount of slag, gypsum and other mixed materials) into relatively fine raw materials. The main equipment of the system is: batching system, conveying system, V-shaped static air classifier, roller press system, powder separator, circulating fan, and high-efficiency cyclone dust collector. [0003] The working process of the system is: the main equipment of the batching system is the quantitative feeding scale, each raw material has a corresponding quantitative feeding scale, and the feeding amount and proportion of various raw materials are controlled by the frequency converter of the quantitative feeding scal...

AI Technical Summary

Problems solved by technology

The disadvantages are as follows: First, this manual sampling method requires laboratory personnel to constantly go back and forth between the site and the laboratory in the sampling process, and cycle sampling and testing operations

This artificial control method not only consumes a lot of manpower and material resources, but also cannot output detection data in real time for real-time guidance of central control control

The second is that central control controls production based on the test results every hour, which will inevitably cause a lag in control, which will lead to over-grinding and under-grinding phenomena

Over-grinding refers to the grinding of the incoming powder is too fine, exceeding the specific surface area required by the laboratory, which will cause waste of energy; under-grinding refers to the grinding of the incoming powder is too coarse, which does not meet the specific surface area required by the laboratory , resulting in unqualified finished cement

Images