Heat treatment device, heat treatment method, and method for producing chemical products

Abstract

A heat treatment device according to the present disclosure comprises a heating furnace 1 that has an internal space into which an object to be treated is supplied, a heat generating resistor 2, a power supply unit 3, a current measuring unit 4, a voltage measuring unit 5, and a control unit 6, wherein the control unit 6 comprises: a temperature setting unit 61 for setting a target temperature for heating the object to be treated; an electrical resistance value calculating unit 62 for calculating the electrical resistance value of the heat generating resistor 2 from the current and voltage measured by the current measuring unit 4 and the voltage measuring unit 5; a temperature calculating unit 63 for calculating the temperature of the heat generating resistor 2 on the basis of the electrical resistance value; a temperature comparing unit 64 for comparing the temperature of the heat generating resistor 2 with the target temperature; a determining unit 65 for determining the amount of electric power supplied from the power supply unit 3 to the heat generating resistor 2 on the basis of the comparison result obtained by the temperature comparing unit 64; and an adjusting unit 66 for adjusting the electric power supplied from the power supply unit 3 to the heat generating resistor 2 on the basis of the amount of electric power determined by the determining unit 65.

Claims

1. A heating furnace having an internal space into which a workpiece is supplied; a heating resistor disposed within the heating furnace; a power supply unit that supplies power to the heating resistor; a current measuring unit that measures the current flowing through the heating resistor due to the power supplied to the heating resistor from the power supply unit; a voltage measuring unit that measures the voltage applied to the heating resistor due to the power supplied to the heating resistor from the power supply unit; and a control unit that controls the power supplied to the heating resistor from the power supply unit, wherein the control unit comprises: a temperature setting unit that sets a target temperature for heating the workpiece; an electrical resistance value calculation unit that calculates the electrical resistance value of the heating resistor from the current measured by the current measuring unit and the voltage measured by the voltage measuring unit; a temperature calculation unit that calculates the temperature of the heating resistor based on the electrical resistance value calculated by the electrical resistance value calculation unit; a temperature comparison unit that compares the temperature of the heating resistor calculated by the temperature calculation unit with the target temperature set by the temperature setting unit; and a determination unit that determines the amount of power to be supplied to the heating resistor from the power supply unit based on the comparison result by the temperature comparison unit. A heat treatment apparatus characterized by having a correction unit that corrects the amount of power supplied from the power supply unit to the heating resistor based on the amount of power determined by the determination unit.

2. The heat treatment apparatus according to claim 1, further comprising: a material supply unit connected to the heating furnace and supplying the material to be treated into the internal space of the heating furnace; and a material removal unit connected to the heating furnace and removing the material that has been heat-treated in the internal space of the heating furnace.

3. The heat treatment apparatus according to claim 1 or claim 2, further comprising a gas supply unit connected to the heating furnace and supplying gas to the internal space of the heating furnace.

4. The heat treatment apparatus according to claim 2 or 3, further comprising: a material recovery unit connected to the material removal unit for recovering the material; and a cooling unit disposed between the heating furnace and the material recovery unit.

5. The heat treatment apparatus according to any one of claims 1 to 4, wherein the heat-generating resistor is one or more metals selected from the group consisting of Kanthal, tungsten, molybdenum, and tantalum.

6. The heat treatment apparatus according to any one of claims 1 to 5, wherein the heat-generating resistor is in the form of a rod, thread, drawn wire, film, plate, coil, double helix coil, mesh, foil, fabric, film, or layer.

7. A heat treatment method characterized by heat treating the object to be treated using a heat treatment apparatus described in any one of claims 1 to 6.

8. The heat treatment method according to claim 7, further comprising continuously heating the object to be treated with the heating resistor.

9. The heat treatment method according to claim 7 or claim 8, wherein the temperature coefficient of resistance of the heat-generating resistor at the target temperature is 1,000 ppm / °C or more.

10. A method for producing a chemical product, comprising heat-treating a target object using a heat treatment apparatus described in any one of claims 1 to 6, wherein the target object is a plastic, and the chemical product comprises at least one chemical product selected from the group consisting of olefins having 2 to 5 carbon atoms and aromatic hydrocarbons.

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