Heat accumulating type rapid pyrolyzing furnace temperature control method for controlling on-off time of radiant tubes

Abstract

The invention provides a heat accumulating type rapid pyrolyzing furnace temperature control method for controlling the on-off time of radiant tubes. The method comprises the steps that N layers of radiant tubes are selected to serve as a temperature control zone, wherein the expected temperature of the temperature control zone is Tq; a unit control time interval is set as tn; the temperatures T(m) of all the radiation tubes in the temperature control zone are measured; an average value Tavg of the temperatures of all the radiation tubes in the temperature control zone is calculated; the temperature T of a rapid pyrolyzing section corresponding to the temperature control zone is measured; the Tq, the T(m) and the Tavg are introduced into a first PID controller and a second PID controller respectively, and it is ensured that the first PID controller calculates and outputs ta and tb values in real time; the ta and tb values are added, and corresponding radiant tubes are turned off according to the length of the added values; the process is repeated to achieve rapid pyrolyzing furnace temperature control. The phenomenon that the service life of the radiant tubes is influenced by too high temperature can be avoided, and an uniform temperature field is easy to achieve.

Description

technical field [0001] The invention relates to the field of temperature control of pyrolysis furnaces, in particular to the field of automatic control of heat storage type fast pyrolysis furnace temperature, and mainly relates to a temperature control method for heat storage type fast pyrolysis furnaces for controlling the on-off time of radiant tubes . Background technique [0002] Rapid pyrolysis can cause carbon-containing polymers to rapidly undergo bond-breaking reactions, inhibit the secondary pyrolysis reaction and cross-linking reaction of pyrolysis products, reduce the gas and semi-coke products in the pyrolysis process, and increase the tar yield. The regenerative fast pyrolysis furnace adopts the regenerative radiant tube as the heating source to realize the rapid pyrolysis of carbon-containing organic matter. The pyrolysis zone of the regenerative fast pyrolysis furnace is composed of multi-layer regenerative radiant tubes, which are distributed at intervals in...

AI Technical Summary

Problems solved by technology

However, the temperature control scheme of this method is relatively specific, not flexible enough, and requires considerable calculation, which is complicated to implement.

[0004] Because the existing multi-layer radiant tube zone heating and control method is not flexible enough, the implementation is complicated, and the implementation cost is high, so it is necessary to study the temperature control method of the regenerative fast pyrolysis furnace that is more flexible, simpler, and low in implementation cost , to better suit the requirements of the process

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