TH29609B - Methods and apparatus for controlling atmospheres in furnaces used for heat treatment. - Google Patents

Abstract

DC60 (25/05/49) In methods and finishes for atmospheric control in heat treatment furnaces, decarbonization is performed while hydrocarbon and oxidizing gases are fed into the furnace. The amount of CH4 residual, the oxidizing gas sub-pressure and the CO sub-pressure were measured. conforms to one of the sub-pressure values In methods and finishes for controlling the atmosphere in heat treatment furnaces Carbonization is performed while feeding the hydrocarbon pack gas. and the oxidized gas into the furnace, the amount of CH4 remaining, the sub-pressure of the oxidizing gas and the CO sub-pressure is measured, the amount of each gas being fed into the furnace is regulated in accordance with one of the sub-pressure values.

Claims (6)

1. Method for controlling the atmosphere in the furnace using heat treatment Which consists of Carbonization operations while feeding hydrocarbon series gases And the oxidized gas enters the furnace and the interruption of the feeding of the oxidized gas when the sub-pressure of the CO in the furnace reaches a value corresponding to the oxidation layer depth at the pellet joint approximately 13.5. Um 2. Method for controlling the atmosphere in the furnace used for heat treatment Which consists of Carbonization operations while feeding hydrocarbon series gases And oxidized gas enters the furnace The stopping of the oxidizing gas feed when the CD sub-pressure in the furnace reaches a value corresponding to the oxidation layer depth at the pellet chain approximately 13.5 Um, and the hydrocarbon series gas feed volume control for Let the carbon potential in the furnace reach the value determined by the equation ac = pco / (K p.Po2 1/2) where ac is the carbon potential, Pco is the sub pressure of CO, Po2 is the sub pressure of o2. And Kp is the equilibrium constant. 3.The method for controlling the atmosphere in the furnace used for heat treatment as requested in claim 1, where the idro-carbon gas is butane and the sub-pressure of cO only with approx.30. Percent 4. Method for controlling the atmosphere in the furnace using heat treatment as requested in claim 1, where the idro-carbon gas is propane and the sub-pressure of cO only with C.27 Percent 5. Method for controlling the atmosphere in the furnace using heat treatment as requested in claim 1, where the idro-carbon gas is LPG and the sub-pressure of cO only with approximately 29 percent 6 The method for controlling the atmosphere in the furnace using heat treatment as requested in claim 1, where the idro-carbon gas is methane and the cO fraction only with approximately 24 percent 7. The method of controlling the atmosphere in the furnace used for heat treatment. Which consists of Operations of carbonation while feeding hydrocarbon gases And oxidizing gas entering the furnace and controlling the amount of hydrocarbon gas input so that the carbon potential in the furnace is reached as determined by the equation ac = pco / (K p.Po2 1/2) where ac is the carbon potential, Pco is the fractional pressure of CO, Po2 is the sub pressure of o2, and Kp is the equilibrium constant. Rights 1 where hydrocarbon gas input is halted when the amount of CH4 remaining in the furnace is changed from reduction to increase. 9. Methods for controlling the atmosphere in the heat treatment furnace as requested in Claim 1 where hydrocarbon gases are primarily hydrocarbons It consists of one of acetylene, methane, propane and butane. 1 0. Method for controlling the atmosphere in the furnace used for heat treatment as requested in the claim. 1 where oxidizing gas is composed of air and CO2 gas 1 1. Regulators for controlling the atmosphere in the furnace. The control equipment includes a heating device for heating the inside of the furnace, a path for measuring the sub-pressure of the CO in the furnace, a path for conducting carbon potential in the furnace, a path for transmission. Hydrocarbon gas And oxidized gas enters the furnace, a method for controlling the amount of hydrocarbon gas And the oxidized gas introduced into the furnace, and the method for controlling the hydrocarbon intake in the furnace to the values given by the equation ac = pco / (K p.Po2 1/2). Where ac is the carbon potential, Pco is the fractional pressure of CO, Po2 is the sub pressure of o2, and Kp is the equilibrium constant 1 2. Regulators for controlling the atmosphere in the furnace, as claimed in claim 11. It still contains a method for measuring the digestive oxygen pressure. And the CH4 sub-pressure in the furnace 1 3. Control equipment for controlling the atmosphere in the furnace as requested in claim 11, where hydrogen, carbon, contains hydrocarbons as the main component. And contains one of the groups of acetylsalene, methane, propane and butane 1. 4.Control devices for controlling the atmosphere in the furnace, as requested in claim 11, where oxidized gas consists of one of air and cO2 gas 1. 5.Control devices for regulating the atmosphere in the furnace. The control equipment includes a heating device for heating the furnace interior, a path for measuring the sub-pressure of the CO in the furnace, a path for conducting carbon potential in the furnace, a path for the Hydrocarbon gas delivery And oxidized gas enters the furnace, a method for controlling the amount of hydrocarbon gas And the oxidized gas introduced into the furnace, and the path for stopping the feeding of the oxidizing gas when the sub-pressure of cO in the furnace reaches a value corresponding to The depth of the oxidation layer at the pellet joints approximately 13.5 Um 01. 6. Control equipment for controlling the atmosphere in the furnace as requested in claim 1 or 2.