Sulfuric acid and hydrogen generation system

Abstract

To efficiently produce sulfur trioxide by the reaction of sulfurous acid gas and oxygen, and to effectively use heat generated by the reaction, in the system.SOLUTION: There is provided a system of producing sulfuric acid and hydrogen, comprising a sulfurous acid gas generation device 2 of generating sulfurous acid gas S1 by burning a sulfur component, a conversion device 4 of generating sulfur trioxide SO3 by the exothermic reaction of sulfurous acid gas S3 and oxygen, a heat exchanger 5 disposed in the conversion device 4 to recover heat present in the conversion device 4 to adjust the reaction temperature of the exothermal reaction, and an IS cycle device 7 that generates hydrogen iodide HI and sulfuric acid H2SO4 by the Bunsen reaction of sulfurous acid gas S4, water H2O and iodine I2 and generates hydrogen H2 and iodine I2 by the decomposition reaction of hydrogen iodide HI. The IS cycle device 7 uses heat recovered by the heat exchanger 5 as a heat source for the Bunsen reaction and / or the decomposition reaction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a system for producing sulfuric acid and hydrogen. [Background technology]

[0002] The following Patent Document 1 describes a system for producing sulfuric acid and hydrogen using sulfurous acid gas discharged from a sulfur furnace. In this system, the sulfurous acid gas discharged from the sulfur furnace is separated into a first sulfurous acid gas and a second sulfurous acid gas. The first sulfurous acid gas is then reacted with oxygen to produce sulfur trioxide, which is then absorbed into sulfuric acid to produce concentrated sulfuric acid. The second sulfurous acid gas is then subjected to a Bunsen reaction with water and iodine to produce hydrogen iodide and sulfuric acid, which is then decomposed to produce hydrogen and iodine. The hydrogen and iodine are then used again in the Bunsen reaction, repeating the cycle (IS cycle).

[0003] On the other hand, in the technology described in Patent Document 1 below, the reaction temperature between the first sulfur dioxide gas and oxygen increases rapidly due to heat generated by the reaction between the first sulfur dioxide gas and oxygen, which may reduce the efficiency of sulfur trioxide production. Furthermore, the heat generated by the reaction is not effectively utilized. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5385153 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to efficiently produce sulfur trioxide by the reaction of sulfur dioxide gas with oxygen, and then to effectively utilize the heat generated by this reaction within the system. [Means for solving the problem]

[0006] The sulfuric acid and hydrogen generation system according to the first aspect of the present invention includes a sulfur dioxide generation device that generates sulfur dioxide gas by burning sulfur content, a conversion device that generates sulfur trioxide by an exothermic reaction between the sulfur dioxide gas and oxygen, a heat exchange device that is provided inside the conversion device to recover heat inside the conversion device and adjust the reaction temperature of the exothermic reaction, and an IS cycle device that generates hydrogen iodide and sulfuric acid by a Bunsen reaction of the sulfur dioxide gas, water, and iodine, and generates hydrogen and iodine by a decomposition reaction of the hydrogen iodide. The IS cycle device uses the heat recovered by the heat exchange device as a heat source for the Bunsen reaction and / or the decomposition reaction.

[0007] According to the first item, by recovering heat by a heat exchanger inside the conversion apparatus, a significant increase in reaction temperature due to heat generation accompanying the reaction of sulfur dioxide gas with oxygen can be prevented, and the reaction temperature can be maintained within an appropriate range. This allows sulfur trioxide to be efficiently produced in the conversion apparatus. Furthermore, the heat recovered by the heat exchanger can be effectively used to promote the Bunsen reaction and / or decomposition reaction in the IS cycle apparatus, allowing sulfuric acid and hydrogen to be efficiently produced in the IS cycle apparatus.

[0008] The sulfuric acid and hydrogen generation system according to the second aspect of the present invention further includes a waste treatment device that heat-treats organic waste, and a valuable resource generation device that generates generated water and methane or methanol by reacting the hydrogen with carbon dioxide generated from the organic waste in the waste treatment device.

[0009] According to the second item, while the organic waste is being heat-treated, the carbon dioxide generated thereby can be utilized to produce valuable materials (water, methane or methanol).

[0010] In a sulfuric acid and hydrogen generation system according to a third aspect of the present invention, the IS cycle device utilizes the generated water in the Bunsen reaction.

[0011] According to the third aspect, water (valuable resource) generated in the valuable resource generation device can be used to generate sulfuric acid and hydrogen in the IS cycle device.

[0012] In the sulfuric acid and hydrogen generation system according to the fourth aspect of the present invention, the sulfurous acid gas generation device is a copper smelting device that produces crude copper by smelting copper concentrate and generates the sulfurous acid gas. The organic waste contains copper. The copper smelting device smelts ash generated from the organic waste in the waste treatment device together with the copper concentrate.

[0013] According to the fourth item, the sulfurous acid gas generated by copper smelting can be utilized to generate sulfuric acid and hydrogen, and the copper mixed in the organic waste can be utilized to produce crude copper. Effect of the Invention

[0014] As described above, according to the present invention, sulfur trioxide can be efficiently produced by the reaction of sulfur dioxide gas with oxygen, and the heat generated by this reaction can be effectively utilized within the system. [Brief description of the drawings]

[0015] [Figure 1] 1 is an overall configuration diagram showing a sulfuric acid and hydrogen generation system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Fig. 1 is an overall configuration diagram showing a sulfuric acid and hydrogen generation system according to one embodiment of the present invention. As shown in Fig. 1, this system 1 is composed of a copper smelting device 2, a cleaning device 3, a conversion device 4, a heat exchange device 5, an absorption device 6, an IS cycle device 7, a waste treatment device 8, and a valuable resource generation device 9.

[0017] The copper smelting apparatus 2 produces blister copper C2 by smelting copper concentrate C1 and generates sulfurous acid gas S1. In this way, the copper smelting apparatus 2 functions as a sulfurous acid gas generating apparatus that burns sulfur (sulfur content) contained in the copper concentrate C1 to generate sulfurous acid gas S1.

[0018] The scrubbing device 3 scrubs a portion S2 of the sulfur dioxide gas S1 with cleaning water while cooling it, thereby removing dust and impurities contained in the sulfur dioxide gas S2 and generating sulfur dioxide gas S3.

[0019] The converter 4 produces sulfur trioxide SO3 by the exothermic reaction of sulfur dioxide S3 with oxygen. Vanadium pentoxide is used as a catalyst for this exothermic reaction.

[0020] The heat exchanger 5 is provided inside the conversion device 4, and recovers heat therein by using a heat medium to adjust the reaction temperature of the exothermic reaction between the sulfur dioxide gas S3 and oxygen. Furthermore, the heat exchanger 5 supplies this heat medium to the IS cycle device 7, thereby supplying the heat H recovered by the heat medium to the IS cycle device 7.

[0021] The absorber 6 absorbs the sulfur trioxide SO3 produced in the converter 4 into sulfuric acid to produce concentrated sulfuric acid H2SO4.

[0022] The IS cycle device 7 includes a Bunsen reaction device 7a that causes a Bunsen reaction, and a decomposition reaction device 7b that causes a decomposition reaction. Specifically, the Bunsen reaction device 7a generates hydrogen iodide HI and sulfuric acid H2SO4 by the Bunsen reaction of the remaining sulfur dioxide gas S1, water H2O, and iodine I2. The decomposition reaction device 7b generates hydrogen H2 and iodine I2 by the decomposition reaction of hydrogen iodide HI supplied from the Bunsen reaction device 7a. The decomposition reaction device 7b supplies the generated iodine I2 to the Bunsen reaction device 7a. Here, the decomposition reaction device 7b uses heat H supplied from the heat exchange device 5 as a heat source for the decomposition reaction.

[0023] The waste treatment device 8 heats and burns the organic waste W. This generates ash A and carbon dioxide CO2. The organic waste W used here contains copper. Therefore, the ash A contains the copper that was contained in the organic waste W. The copper smelting device 2 smelts the ash A containing copper together with the copper concentrate C1.

[0024] The valuable resource generation device 9 reacts the hydrogen H2 discharged from the decomposition reaction device 7b with the carbon dioxide CO2 discharged from the waste treatment device 8. As a result, the valuable resource generation device 9 generates water (produced water) and methane, which are valuable resources V.

[0025] Next, the operation of the sulfuric acid and hydrogen generation system 1 shown in Fig. 1 will be described. First, blister copper C2 is produced by smelting copper concentrate C1 in a copper smelting apparatus 2. Here, sulfur contained in the copper concentrate C1 is burned to generate sulfurous acid gas S1.

[0026] A part S2 of the sulfur dioxide gas S1 is washed with wash water in a washing device 3 to remove dust and impurities from the sulfur dioxide gas S2, thereby generating sulfur dioxide gas S3. Furthermore, in a conversion device 4, the sulfur dioxide gas S3 is reacted with oxygen to generate sulfur trioxide SO3. Here, inside the conversion device 4, heat generated by the exothermic reaction between the sulfur dioxide gas S3 and oxygen is recovered by a heat exchanger 5. Furthermore, the sulfur trioxide SO3 is absorbed by sulfuric acid in an absorption device 6 to generate concentrated sulfuric acid H2SO4.

[0027] Meanwhile, in the IS cycle device 7, the remaining portion S4 of the sulfurous acid gas S1 is supplied to the Bunsen reaction device 7a. As a result, in the Bunsen reaction device 7a, the sulfurous acid gas S4, water H2O, and iodine I2 are reacted to generate hydrogen iodide HI and sulfuric acid H2SO4. Furthermore, in the decomposition reaction device 7b, the hydrogen iodide HI supplied from the Bunsen reaction device 7a is decomposed using heat H supplied from the heat exchange device 5 as a heat source to generate hydrogen H2 and iodine I2. Thereafter, the iodine I2 generated in the decomposition reaction device 7b is supplied to the Bunsen reaction device 7a, and the reactions in the Bunsen reaction device 7a and the decomposition reaction device 7b in the IS cycle device 7 are carried out in parallel and continuously.

[0028] In the waste treatment device 8, the organic waste W is heat-treated and combusted to generate ash A and carbon dioxide CO2. Furthermore, in the valuable resource generation device 9, hydrogen H2 supplied from the decomposition reaction device 7b reacts with carbon dioxide CO2 discharged from the waste treatment device 8 to generate valuable resource V. The valuable resource V is a mixture of water and methane.

[0029] As described above, according to the above embodiment, by recovering heat by the heat exchanger 5 inside the conversion device 4, a significant increase in the reaction temperature due to heat generation accompanying the reaction of the sulfur dioxide gas S3 with oxygen can be prevented, and the reaction temperature can be maintained within an appropriate range. As a result, sulfur trioxide SO3 can be efficiently produced in the conversion device 4, and concentrated sulfuric acid H2SO4 can be efficiently produced in the absorption device 6. Furthermore, the heat H recovered by the heat exchanger 5 can be effectively used to promote the Bunsen reaction and / or decomposition reaction in the IS cycle device 7, and therefore sulfuric acid H2SO4 and hydrogen H2 can be efficiently produced in the IS cycle device 7.

[0030] According to the above embodiment, the organic waste W is heat-treated, and the carbon dioxide CO2 produced thereby can be utilized to generate valuable materials V (water and methane) within the system 1 without being discharged outside the system 1. Furthermore, the copper mixed in the organic waste W can be utilized together with the copper concentrate C1 to produce crude copper C2.

[0031] In the above embodiment, instead of the copper smelting apparatus 2, a sulfur dioxide gas generator (e.g., a sulfur furnace) other than the copper smelting apparatus 2 can be used. Also, the heat H can be used as a heat source for the Bunsen reaction in the Bunsen reaction apparatus 7a. Furthermore, the heat H can be used as a heat source for both the Bunsen reaction in the Bunsen reaction apparatus 7a and the decomposition reaction in the decomposition reaction apparatus 7b.

[0032] In the above embodiment, water and methane are generated as the valuable resource V by the valuable resource generation device 9, but instead, water and methanol can be generated as the valuable resource V. Also, the water contained in the valuable resource V can be used as water H2O in the Bunsen reaction device 7a. In this case, it is necessary to remove substances other than water from the valuable resource V.

[0033] Furthermore, in the above embodiment, the sulfur dioxide gas S1 is divided into the sulfur dioxide gas S2 and the sulfur dioxide gas S4, but the sulfur dioxide gas S1 may be divided into three or more gas streams. Furthermore, a plurality of sources of sulfur dioxide gas may be provided, and the sulfur dioxide gas discharged from one source may be supplied to the scrubbing device 3, and the sulfur dioxide gas discharged from the other source may be supplied to the IS cycle device 7. [Explanation of symbols]

[0034] 1. Sulfuric acid and hydrogen generation system 2 Copper smelting equipment (sulfur dioxide gas generating equipment) 3. Cleaning equipment 4. Conversion equipment 5 Heat exchange device 6. Absorber 7 IS Cycle Equipment 7a Bunsen reaction apparatus 7b Decomposition reactor 8 Waste treatment equipment 9 Valuable resource generating equipment A Ash content C1 copper concentrate C2 blister copper H fever S1~S4 Sulfur dioxide gas V Valuables W Organic waste

Claims

1. A sulfur dioxide gas generator that burns sulfur to generate sulfur dioxide gas; a converter for producing sulfur trioxide by an exothermic reaction of the sulfur dioxide gas with oxygen; a heat exchanger provided inside the conversion apparatus to recover heat in the conversion apparatus and adjust the reaction temperature of the exothermic reaction; an IS cycle device that generates hydrogen iodide and sulfuric acid by a Bunsen reaction of the sulfur dioxide gas, water, and iodine, and generates hydrogen and iodine by a decomposition reaction of the hydrogen iodide; The IS cycle device is characterized in that the heat recovered by the heat exchange device is utilized as a heat source for the Bunsen reaction and / or the decomposition reaction.

2. a waste treatment device for heat treating organic waste; 2. The sulfuric acid and hydrogen generation system according to claim 1, further comprising a valuable resource generation device that generates generated water and methane or methanol by reacting the hydrogen with carbon dioxide generated from the organic waste in the waste treatment device.

3. The sulfuric acid and hydrogen generating system according to claim 2 , wherein the IS cycle device utilizes the generated water in the Bunsen reaction.

4. 4. The sulfuric acid and hydrogen generation system according to claim 1, wherein the sulfurous acid gas generation device is a copper smelting device that smelts copper concentrate to produce crude copper while generating the sulfurous acid gas.

5. The sulfur dioxide gas generator is a copper smelting apparatus that produces blister copper by smelting copper concentrate and generates the sulfur dioxide gas at the same time, The organic waste is contaminated with copper, 4. The sulfuric acid and hydrogen production system according to claim 2, wherein the copper smelting apparatus smelts ash produced from the organic waste in the waste treatment device together with the copper concentrate.

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