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JP-2026076014-A - Heating furnace system

JP2026076014AJP 2026076014 AJP2026076014 AJP 2026076014AJP-2026076014-A

Abstract

[Problem] To provide a heating furnace system that uses carbon-containing fuel and is suitable for reducing CO2 emissions. [Solution] A heating furnace system comprising a heating furnace having a burner that heats an object to be heated by burning fuel with an oxidizer, and a CO2 recovery device that recovers CO2 from exhaust gas generated by the combustion of the fuel by the burner and discharged from the heating furnace, wherein the fuel contains a carbon-containing fuel and the oxidizer has an oxygen concentration of 90% or more. [Selection Diagram] Figure 1

Inventors

  • 諸熊 晶
  • 斉藤 岳志
  • 萩原 義之

Assignees

  • 日本酸素株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (11)

  1. A heating furnace having a burner that heats an object to be heated by burning fuel with an oxidizer, The system includes a CO2 recovery device that recovers CO2 from exhaust gas generated by the combustion of the fuel by the burner and discharged from the heating furnace, The fuel mentioned above includes carbon-containing fuel. The oxidizing agent is a heating furnace system in which the oxygen concentration is 90% or higher.
  2. The heating furnace system according to claim 1, further comprising a fuel regeneration unit that chemically transforms the CO2 recovered by the CO2 recovery device into reusable fuel that is reused as part of the fuel.
  3. The heating furnace system according to claim 2, wherein the fuel regeneration unit chemically converts the CO2 recovered by the CO2 recovery device into CO as a reusable fuel by reacting it with hydrogen in a reverse shift reaction.
  4. The heating furnace system according to claim 2, wherein the fuel regeneration unit chemically transforms the CO2 recovered by the CO2 recovery device into CH4 as the recycled fuel by reacting it with hydrogen in a Sabatier reaction.
  5. The heating furnace system according to claim 3 or 4, wherein the fuel regeneration unit has a hydrogen generation unit that chemically transforms H₂O into hydrogen used in the fuel regeneration unit by electrolysis.
  6. The heating furnace system according to claim 5, wherein the fuel regeneration unit utilizes electricity generated from renewable energy for electrolysis in the hydrogen generation unit.
  7. The heating furnace system according to claim 2, wherein the fuel regeneration unit chemically converts the CO2 recovered by the CO2 recovery device into CO as the recycled fuel using plasma and a catalyst.
  8. The heating furnace system according to claim 7, wherein the fuel regeneration unit utilizes electricity generated from renewable energy sources for the generation of the plasma.
  9. The heating furnace system according to claim 2, wherein the fuel regeneration unit utilizes electricity generated from renewable energy to regenerate the recycled fuel from the CO2 .
  10. The heating furnace system according to claim 9, wherein the fuel regeneration unit regenerates the recycled fuel within the range where electricity generated from the renewable energy can be used.
  11. The system includes a control device that controls the amount of fuel used and the amount of oxidizer used. The control device is A calculation unit that calculates the amount of recycled fuel that can be recycled in the fuel recycling unit within the range in which electricity generated from the aforementioned renewable energy can be used, The heating furnace system according to claim 10, further comprising a determination unit that determines the amount of fuel used and the amount of oxidizer used based on the calculation results of a calculation unit.

Description

This invention relates to a heating furnace system. A burner is known that heats an object by burning fuel with an oxidizer (see, for example, Patent Document 1). Patent No. 4261753 This is a schematic diagram showing a heating furnace system according to the first embodiment of the present invention.This is a schematic diagram showing a heating furnace system according to a second embodiment of the present invention.This is a schematic diagram showing a heating furnace system according to a third embodiment of the present invention. The following describes embodiments of the present invention with reference to the drawings. As shown in Figure 1, in the first embodiment of the present invention, the heating furnace system 1 includes a heating furnace 5 having a burner 5a that heats an object to be heated 4 by burning fuel 2 with an oxidizer 3, and a CO2 recovery device 7 that recovers CO2 (carbon dioxide) from exhaust gas 6 produced by the combustion of fuel 2 by the burner 5a and discharged from the heating furnace 5, wherein the fuel 2 contains a carbon-containing fuel, and the oxidizer 3 has an oxygen ( O2 ) concentration of 90% or more. Fuel 2 is not particularly limited as long as it contains a carbon-containing fuel, but it is preferable that it contains a carbon-containing fuel as its main component (i.e., the carbon-containing fuel is more than 50% and not more than 100%). In this embodiment, the carbon-containing fuel is mainly composed of methane ( CH4 ), but is not limited to this, and may be various fossil fuels or mixtures thereof. As fossil fuels, solid fuels such as pulverized coal, liquid fuels such as kerosene or heavy oil, or gaseous fuels such as natural gas or LPG can be used. It is preferable to supply fuel 2 in a gaseous state (i.e., as fuel gas) to the burner 5a and have it ejected from the burner 5a. Similarly, it is preferable to supply the oxidizer 3 in a gaseous state (i.e., as oxidizer gas) to the burner 5a and have it ejected from the burner 5a. A portion of the oxidizer 3 may be supplied to the burner flame 5b without passing through the burner 5a. It is preferable that this portion of the oxidizer 3 is also supplied in a gaseous state. The heating furnace 5 heats the object to be heated 4 by radiant heat transfer from the burner flame 5b, which is produced by burning fuel 2 with the burner 5a, and by convective heat transfer from the flow of combustion gases generated by the combustion, melting it as needed. The object to be heated 4 is not particularly limited and may be, for example, a metal such as aluminum, or glass. The exhaust gas 6 contains CO2 and H2O (water) produced by combustion, as well as other gases (for example, N2 : nitrogen contained in the oxidizer 3). The CO2 recovery device 7 recovers CO2 from the exhaust gas 6 and discharges H2O and other gases. The type of CO2 recovery device 7 is not particularly limited and can be appropriately selected depending on the amount of exhaust gas discharged from the heating furnace 5. Examples include membrane separation, PSA (Pressure Swing Adsorption), chemical adsorption, or physical adsorption. The chemical formulas for burning CH4 , the main component of common fossil fuels, in air and in oxygen are as follows. Table 1 shows the CO2 and H2O concentrations in the exhaust gas 6 for each case. CH₄ + 2O₂ + 8N₂ → CO₂ + 2H₂O + 8N₂ ... Equation (1) CH₄ + 2O₂ →CO 2 +2H 2 O ...Formula (2) Equation (1) shows the case when CH4 is burned in air. Equation (2) shows the case when CH4 is burned in oxygen. As shown in Table 1, the CO2 concentration in the combustion gas is higher when combustion is performed using oxygen (oxygen concentration 100%) than when combustion is performed using air (oxygen concentration 20%). Therefore, as in this embodiment, by using an oxidizer 3 with an oxygen concentration of 90% or more, the CO2 concentration in the exhaust gas 6 (combustion gas discharged from the heating furnace 5) can be increased, making it easier to recover CO2 with the CO2 recovery device 7. In addition, the proportion of radiant gases ( CO2 and H2O ) in the combustion gas increases, which improves the radiant heat transfer efficiency. Furthermore, the energy efficiency for heating can be improved by improving the radiant heat transfer efficiency and reducing the amount of exhaust gas 6. The heating furnace system 1 has a fuel regeneration unit 8 that chemically transforms the CO2 recovered by the CO2 recovery device 7 into recycled fuel 2a, which is reused as part of the fuel 2. With this configuration, by circulating the recovered CO2 as recycled fuel 2a, the amount of CO2 emitted from the heating furnace system 1 to the outside can be reduced, and at the same time, the amount of fuel 2 consumed can be reduced. The fuel regeneration unit 8 has a reverse shift reaction unit 8a that chemically transforms the CO2 recovered by the CO2 recovery device 7 into CO as a reusable fuel 2a by reacting it with hydrogen in a reverse shift re