Method for producing carbon monoxide

Abstract

To provide a carbon monoxide production method capable of efficiently producing carbon monoxide from combustible waste.SOLUTION: The carbon monoxide production method disclosed in the present patent comprises a control device that controls an air blower fan 4 provided in an air supply pipe and an input amount of combustible waste so as to maintain a high carbon monoxide concentration while measuring components of the air supply pipe 3 and the exhaust pipe 5 and a temperature of a combustion chamber 1 in an incinerator for combustible waste shown in the figure.SELECTED DRAWING: Figure 1.

Description

Detailed Description of the Invention [Technical Field]

[0001] The present invention relates to a method for producing a carbon monoxide-rich gas from combustion gases generated during the incineration of waste. [Background technology]

[0002] Combustible waste from industrial waste and general households is completely burned at incinerators to prevent the generation of harmful gases such as carbon monoxide and nitrogen oxides. The main components of gases generated by this complete combustion are water vapor and carbon dioxide. Carbon dioxide is considered to be a cause of global warming. From the perspective of the SDGs, various efforts are being made to prevent carbon dioxide from being released into the atmosphere.

[0003] The above efforts can be broadly divided into 1. Methods for capturing carbon dioxide. 2. Methods that do not generate carbon dioxide. This is being considered in two technical fields: The first method involves capturing carbon dioxide generated during thermal power generation, boiler operation, and the automobile paint baking process, compressing it under high pressure, filling it into sturdy containers as a liquid, and storing it deep underground. The second method is to use hydrogen instead of coal, which is used as a reducing agent for iron ore in the steel industry, which generates large amounts of carbon dioxide.

[0004] In the first technical field above, for example, Literature 1 proposes a method for separating carbon monoxide by applying high-energy electromagnetic waves directly to carbon dioxide or indirectly to a dielectric material that adsorbs carbon dioxide, thereby converting the carbon dioxide into plasma through the following reaction. This reaction device is called a plasma reactor. TIFF2025166763000002.tif1266

[0005] It has been reported that carbon monoxide is generated from internal combustion engines in automobiles, etc. For example, Reference 2 reports that the exhaust gas from a Mitsubishi Lancer contains 6-7% carbon monoxide, depending on the model and period of use.

[0006] In the carbon monoxide production method described above, the gases produced include carbon monoxide, the raw material carbon dioxide, and the by-product oxygen. Furthermore, the combustion gas obtained from combustible waste contains nitrogen, oxygen, and nitrogen oxides in addition to carbon monoxide and carbon dioxide. The desired carbon monoxide can be obtained by distillation, similar to the purification methods for nitrogen and oxygen. For example, the method described in Reference 3 is an example of a method for efficiently extracting high-purity carbon monoxide for use in etching silicon wafers.

[0007] One use of carbon monoxide is the conversion of inorganic substances into organic substances, known as C1 chemistry, as described in Reference 4. CO + 2H2+ catalyst → CH3OH The reduction of iron ore in steel mills is a redox reaction between carbon monoxide and iron oxide, which are generated by incomplete combustion of coal. Fe2O3+ 3CO → 2Fe +3CO2

[0008] As a method for controlling dioxins generated in combustible waste incinerators, for example, reference 5 has established a method of maintaining the temperature of the combustion chamber at 800°C or higher and quickly cooling the exhaust gas to 200°C or lower. [Prior art documents] [Patent documents] [Patent documents] Literature 1

[0009] JP 2024-33508 A [Non-patent literature] [Non-patent literature] Literature 2

[0010] https: / / ameblo.jp / itakame3 / entry-12780481579.html (2022) [Non-patent literature] Literature 3

[0011] Retable 2019 / 171882 [Patent documents] Literature 4

[0012] K.Weissermel, H.-J.Arpe, Industrial Organic Chemistry 5th Edition, Tokyo Kagaku Doujin, 2004. [Non-patent literature] Reference 5

[0013] Chiba City Environmental Bureau, Environmental Conservation Department, Environmental Regulation Division, Bulletin (May 27, 2016) Problems to be solved by the invention: Even in the above-mentioned technologies 1 and 2, electricity and heat are required to obtain high-energy electromagnetic waves and hydrogen. For example, hydrogen can be produced in the following two ways. 2H2O + carbon + heat → 2H2+ CO2 2H2O + electricity → 2H2+ O2 These methods have the dilemma that supplying electricity and heat to obtain carbon monoxide also results in the emission of carbon dioxide.

[0014] In view of the above, the present invention relates to a method for producing carbon monoxide by heating combustible waste from among industrial waste using heat generated during combustion of the combustible waste while reducing the carbon dioxide generated through incomplete combustion.

[0015] The analyzers provided at 2 in Figure 1 are an automatic thermometer, an automatic oxygen concentration meter, an automatic carbon dioxide concentration meter, and an automatic carbon monoxide concentration meter. Specifically, the ENDA-5000 series or ENDA-9000 series stack gas analyzers manufactured by Horiba, Ltd. are suitable. Based on the analysis results, the automatic control devices of automobiles can be used to control the amount of air supply and the amount of combustible waste thrown in.

[0016] The carbon monoxide production method described above initially requires an external energy supply such as heat, but once stable operation is achieved, this can be supplemented by the heat generated by burning waste. Therefore, it can be said to be an environmentally friendly method of producing carbon monoxide. Example 1

[0017] Exhaust gas was obtained using the carbon monoxide production system shown in Figure 1, and the exhaust gas was liquefied at low temperature and separated and purified in a distillation column to obtain each component. The composition of the mixed gas was analyzed by gas chromatography, and the following values ​​were obtained. The gas composition is carbon monoxide: 28.3% by volume, carbon dioxide: 0.1% by volume, hydrogen: 3.6% by volume, nitrogen: 68% by volume. Example 2

[0018] Using the carbon monoxide production system shown in Figure 1, half of the exhaust gas was released into the atmosphere while the other half was obtained. The exhaust gas was liquefied at low temperatures and separated and purified in a distillation column to obtain each component. The composition of the mixed gas was analyzed by gas chromatography, and the following values ​​were obtained. The gas composition is carbon monoxide: 29.2% by volume, carbon dioxide: 0.2% by volume, hydrogen: 3.6% by volume, nitrogen: 67% by volume.

[0019] According to the method for producing carbon monoxide of the present invention, carbon monoxide can be produced more efficiently with a small input of energy. [Brief explanation of the drawings]

[0020] [Figure 1]FIG. 1 is a schematic diagram showing an embodiment of the carbon monoxide production system of the present invention. This schematic diagram 1 is one example of an embodiment and is not intended to limit the embodiment. Explanation of symbols in the diagram: S: Combustion chamber 1: Overall system 2: Combustion management control device. The intake gas volume and the amount of combustible waste input are determined while measuring the components of the intake gas and exhaust gas and the temperature of the combustion chamber. The components of the intake gas are nitrogen, oxygen, carbon dioxide, and carbon monoxide. The components of the exhaust gas are nitrogen, oxygen, carbon dioxide, carbon monoxide, and hydrocarbons. Gas chromatography equipped with an FID detector is suitable for analyzing the hydrocarbons. 3: Intake air pipe 4: Intake air fan 5: Exhaust pipe 6: In the diagram, thick arrows indicate the gas flow. 7: Heat exchanger 8: Heat transfer

Claims

1. A method for producing carbon monoxide from combustion gases emitted from a waste incinerator.

2. 2. The method for producing carbon monoxide according to claim 1, wherein a portion of the combustion gas discharged from a refuse incinerator is extracted.

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