Automatic furnace pressure adjustment mechanism for low-temperature pure oxygen combustion aluminum melting furnace and adjustment method

Abstract

The invention discloses an automatic furnace pressure adjustment mechanism for a low-temperature pure oxygen combustion aluminum melting furnace and an adjustment method. The automatic furnace pressure adjustment mechanism comprises a flashboard, a lever, a balance counterweight block, a cylinder, a pressure sensor, an electromagnetic valve and a controller; the end, sleeved on a support shaft outside a flue, of the lever is fixedly connected with the flashboard, and the balance counterweight block is hung at the other end; the pressure sensor is electrically connected to the controller; the controller is electrically connected to the electromagnetic valve; the electromagnetic valve is electrically connected to the cylinder; the cylinder is connected to the end, away from the flashboard, of the lever; a groove is formed in the side wall of the flue; when the pressure in the furnace is greater than 50 Pa, the flashboard and the balance counterweight block are in a rotation balancing state; due to impact from high-pressure gas, the flashboard is rotated around the support shaft to quickly open the flue for an openness, so that the pressure in the furnace is lowered; and due to actions of the cylinder, the flashboard is rotated around the support shaft to finely adjust the openness of the flue to keep the pressure in the furnace stable. The mechanism can be used for quickly and efficiently adjusting the pressure in the furnace, so that the pressure in the aluminum melting furnace is stabilized within 1-20 Pa.

Description

technical field [0001] The invention relates to the technical field of furnace pressure adjustment of a low-temperature pure oxygen combustion aluminum melting furnace, in particular to an automatic furnace pressure adjustment mechanism and adjustment method for a low-temperature pure oxygen combustion aluminum melting furnace. Background technique [0002] At present, the commonly used combustion methods of aluminum melting furnaces generally include "compressed air + natural gas (coal gas)" and "liquid oxygen + natural gas". The burners using these two combustion methods are called regenerative aluminum melting furnaces respectively. And low-temperature pure oxygen combustion aluminum melting furnace, in which the low-temperature pure oxygen combustion aluminum melting furnace is a new burner developed to further improve the thermal efficiency of the regenerative aluminum melting furnace, reduce nitrogen oxide emissions and reduce metal melting loss. The specific combustio...

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Problems solved by technology

The existing design of furnace pressure control is to control the cylinder through the solenoid valve to change the valve opening and then adjust the pressure in the furnace. The disadvantage of this design is: the start-stop-start-stop work in the initial pneumatic of the burner and the subsequent heat preservation section In this mode, the amount of natural gas and oxygen entering the furnace will increase suddenly, causing the pressure in the furnace to increase suddenly, and the maximum range can reach 400pa. At this time, the signal converted by the solenoid valve is fed back by the cylinder to execute the valve adjustment. , but the execution speed of the cylinder is much slower than the instantaneous change speed of the pressure, and it is easy to cause the pressure regulation system to be disordered and cannot be stabilized in a short time (the existing furnace pressure regulation time is generally longer than 10 minutes), which eventually causes the pressure in the furnace to be unstable. Stability, failure of pressure regulation system, etc.

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