Sinter machine control as a function of waste gas temperature

A process for the automatic control of the travel speed of strand sintering machines used in the sintering of iron-oxide bearing materials of fine particle size in which gas is drawn through the iron-oxide bearing materials into windboxes and is collected in a collecting pipe and in which the speed of the sintering machine is controlled to keep the burn-through point ahead of the discharge end of the machine by measuring the temperature of the collected waste gases in the collecting pipe, generating a first signal as a function thereof, applying said first signal to a regulator to generate a motor speed control signal and applying said speed control signal to a sinter machine drive motor control to control the speed of the machine as a function of the collected waste gas temperature and generating a second signal as a function of the temperature of the waste gases at the windboxes and applying said second signal to said regulator to modify the speed control signal whereby the speed of the sinter machine is controlled as a function of the collected waste gas temperature as modified by the temperature of the waste gases at the windboxes.