Circulating regeneration system and method for blast furnace gas dry desulfurization adsorbent

Abstract

The application discloses a circulating regeneration system and method for a blast furnace gas dry desulfurization adsorbent, effectively solves the problem of processing desorption gas in a microcrystalline or molecular sieve blast furnace gas fine desulfurization process, makes the fine desulfurization adsorbent circulate and regenerate, prolongs the adsorption life, reduces the replacement frequency, and reduces investment and operation cost; the desorption gas adopts small-gas-amount nitrogen, effectively reduces energy consumption, and improves operation safety.

Description

Technical Field

[0001] This invention relates to the field of blast furnace gas desulfurization in the steel industry, and in particular to a dry desulfurization adsorbent recycling system and method for blast furnace gas. Background Technology

[0002] The blast furnace ironmaking process in the steel industry produces a large amount of blast furnace gas. It is estimated that 1700-2200 m³ of gas is typically produced per ton of iron produced. 3 Blast furnace gas, containing combustible gases such as CO and H2, is typically used as fuel for downstream boilers, hot blast stoves, power plants, and steel rolling mills. However, because blast furnace gas also contains sulfur-containing compounds such as COS, CS2, and H2S, combustion produces harmful SO2 gas, and without effective end-of-pipe pollution control equipment, its concentration often exceeds current national emission standards. Due to the dispersed nature of blast furnace gas end-users, the significantly increased flue gas volume after combustion, and site constraints, end-of-pipe treatment is difficult, resulting in high investment and operating costs. Therefore, front-end fine desulfurization of blast furnace gas is currently an effective way to achieve emission standards. Existing blast furnace gas purification processes can be mainly divided into two types: The first type is stepwise fine desulfurization, which mainly involves first converting organic sulfur such as COS and CS2, which are difficult to remove, into inorganic H2S that are easier to treat through catalyst hydrolysis, and then removing H2S by dry or wet methods to finally achieve fine desulfurization of blast furnace gas; The second type is integrated fine desulfurization, which mainly uses adsorbents such as microcrystalline materials or molecular sieves to directly adsorb and remove organic sulfur represented by COS and inorganic sulfur represented by H2S. Microcrystalline or molecular sieve adsorption desulfurization technology has high application prospects due to its advantages such as simple process flow, small footprint, and no secondary pollution. Currently, after microcrystalline or molecular sieve adsorption is saturated, the clean coal gas after fine desulfurization is often heated by a steam heat exchanger to desorb the adsorbed saturated desulfurizing agent, thereby realizing the recycling and regeneration of the desulfurizing agent. However, the treatment of the high concentration of sulfur-containing gas after desorption cannot be well solved. The most common approach is to send it to sintering ignition or gas boiler combustion. However, in practice, it is often impossible to achieve due to site and user limitations, which seriously restricts the application of integrated fine desulfurization technology.

[0003] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a dry desulfurization adsorbent recycling system and method for blast furnace gas, which solves the problem that the high concentration of sulfur-containing gas after desorption cannot be effectively treated in the prior art.

[0005] To address the above technical problems, this invention proposes a blast furnace gas dry desulfurization adsorbent recycling system, comprising an adsorption tower, a multi-stage desorption gas treatment device, a nitrogen storage device, and a heating device.

[0006] The adsorption tower is used to receive blast furnace gas, adsorb high-concentration sulfides in the blast furnace gas, and output the high-concentration sulfur-containing desorbed gas to the multi-stage desorbed gas treatment device.

[0007] The multi-stage gas processing device is used to process the blast furnace gas in multiple stages to remove acidic gases, particulate matter, and sulfur-containing gases, and output purified nitrogen to the nitrogen storage device for recycling.

[0008] The nitrogen storage device is used to store nitrogen.

[0009] The heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower.

[0010] Optionally, the multi-stage desorption gas processing device includes a primary deacidification tower for removing acidic gases and particulate matter.

[0011] Optionally, the multi-stage gas processing device further includes a hydrolysis tower for converting organic sulfides into H2S gas under the action of a catalyst.

[0012] Optionally, the multi-stage gas processing device further includes a secondary deacidification tower for removing sulfur-containing gases.

[0013] Optionally, a circulating fan is also provided between the multi-stage gas processing device and the nitrogen storage device to output nitrogen to the nitrogen storage tank.

[0014] Optionally, the heating device is a steam heat exchanger.

[0015] Optionally, the nitrogen storage device is a nitrogen storage tank.

[0016] Optionally, the adsorption tower includes an outlet for discharging clean coal gas to a coal gas pipeline network.

[0017] Optionally, the nitrogen storage device includes an outlet for discharging clean coal gas to the coal gas pipeline network.

[0018] Based on the same inventive concept, this invention also proposes a method for the cyclic regeneration of adsorbents in the dry desulfurization process of blast furnace gas, comprising:

[0019] The adsorption tower receives blast furnace gas, adsorbs high concentrations of sulfides in the blast furnace gas, and after adsorption saturation, uses heated nitrogen to desorb the adsorbed sulfur-containing substances and outputs the desorbed gas to the multi-stage desorption gas treatment device.

[0020] The multi-stage gas desorption treatment device performs multi-stage treatment on the desorbed gas to remove acidic gases, particulate matter, and sulfur-containing gases, and outputs purified nitrogen to the nitrogen storage device.

[0021] Nitrogen storage devices store nitrogen.

[0022] The heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The blast furnace gas dry desulfurization adsorbent recycling system proposed in this invention includes an adsorption tower, a multi-stage desorption gas treatment device, a nitrogen storage device, and a heating device. The adsorption tower receives blast furnace gas, adsorbs high-concentration sulfides from the gas, and after adsorption saturation, uses high-temperature nitrogen for desorption, outputting the high-concentration sulfur-containing desorption gas to the multi-stage desorption gas treatment device. The multi-stage desorption gas treatment device processes the high-concentration sulfur-containing desorption gas in multiple stages to remove acidic gases, particulate matter, and sulfur-containing gases, and outputs purified nitrogen to the nitrogen storage device. The nitrogen storage device stores nitrogen, and the heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower. This system effectively solves the problem of processing desorption gas from microcrystalline or molecular sieve blast furnace gas fine desulfurization processes, enabling the fine desulfurization adsorbent to be recycled and reused, extending adsorption life, reducing replacement frequency, and decreasing investment and operating costs. The use of small-volume nitrogen in the desorption gas effectively reduces energy consumption and improves operational safety.

[0025] The method for recycling and regenerating the adsorbent for dry desulfurization of blast furnace gas proposed in this invention belongs to the same inventive concept as the system for recycling and regenerating the adsorbent for dry desulfurization of blast furnace gas, and therefore has the same beneficial effects, which will not be elaborated here. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the blast furnace gas dry desulfurization adsorbent recycling system proposed in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the process for the regeneration of the adsorbent in the dry desulfurization of blast furnace gas according to an embodiment of the present invention.

[0028] 1-Adsorption tower, 2-Primary deacidification tower, 3-Hydrolysis tower, 4-Secondary deacidification tower, 5-Circulating fan, 6-Nitrogen storage device, 7-Heating device. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] Please refer to Figure 1 This invention proposes a blast furnace gas dry desulfurization adsorbent recycling system, including an adsorption tower, a multi-stage desorption gas treatment device, a nitrogen storage device, and a heating device.

[0033] The adsorption tower is used to receive blast furnace gas, adsorb high-concentration sulfides in the blast furnace gas, and output the high-concentration sulfur-containing desorbed gas to the multi-stage desorbed gas treatment device.

[0034] The multi-stage desorption gas processing device is used to process high-concentration sulfur-containing desorption gas in multiple stages to remove acidic gases, particulate matter, and sulfur-containing gases, and output purified nitrogen to the nitrogen storage device for recycling.

[0035] The nitrogen storage device is used to store nitrogen.

[0036] The heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower.

[0037] Unlike existing technologies, the blast furnace gas dry desulfurization adsorbent recycling system proposed in this embodiment includes an adsorption tower, a multi-stage desorption gas treatment device, a nitrogen storage device, and a heating device. The adsorption tower receives blast furnace gas, adsorbs high-concentration sulfides from the gas, and outputs the high-concentration sulfur-containing desorption gas to the multi-stage desorption gas treatment device. The multi-stage desorption gas treatment device processes the high-concentration sulfur-containing desorption gas in multiple stages to remove acidic gases, particulate matter, and sulfur-containing gases, and outputs purified nitrogen to the nitrogen storage device. The nitrogen storage device stores nitrogen, and the heating device heats the nitrogen in the storage device before delivering it to the adsorption tower. This effectively solves the problem of processing desorption gas from the fine desulfurization process of microcrystalline or molecular sieve blast furnace gas, enabling the recycling and reuse of the desulfurization adsorbent, extending its adsorption life, reducing replacement frequency, and decreasing investment and operating costs. The use of a small volume of nitrogen in the desorption gas effectively reduces energy consumption and improves operational safety.

[0038] The proposed solution enables precise desulfurization of blast furnace gas, reducing the total sulfur content (as elemental S) to 25 mg / Nm³. 3 It meets existing emission standards, extends the service life of the absorbent, reduces the frequency of absorbent replacement, saves operating costs, and effectively solves the problem of treating the desulfurized gas from integrated blast furnace gas desulfurization, which helps to complete the desulfurization of blast furnace gas as soon as possible.

[0039] Specifically, in this embodiment of the invention, the multi-stage desorption gas processing device includes a primary deacidification tower for removing acidic gases and particulate matter.

[0040] Specifically, in this embodiment of the invention, the multi-stage desorption gas treatment device further includes a hydrolysis tower for converting organic sulfides into H2S gas under the action of a catalyst.

[0041] Specifically, in this embodiment of the invention, the multi-stage analytical gas processing device further includes a secondary deacidification tower for removing sulfur-containing gases.

[0042] Specifically, in this embodiment of the invention, a circulating fan is also provided between the multi-stage analytical gas processing device and the nitrogen storage device to output nitrogen to the nitrogen storage tank.

[0043] Specifically, in this embodiment of the invention, the heating device is a steam heat exchanger.

[0044] Specifically, in this embodiment of the invention, the nitrogen storage device is a nitrogen storage tank.

[0045] Specifically, in an embodiment of the present invention, the adsorption tower includes an outlet for outputting clean coal gas to the coal gas pipeline network.

[0046] Specifically, in this embodiment of the invention, the nitrogen storage device includes an outlet for outputting clean coal gas to the coal gas pipeline network.

[0047] The proposed solution in this embodiment employs a circulating hot nitrogen desorption process to remove saturated adsorbent. The high-concentration sulfur-containing gas released is first passed through a primary deacidification tower to remove acidic gases such as H2S and Cl- from the coal gas. Then, it passes through a hydrolysis tower to hydrolyze COS in the coal gas into H2S. Finally, it passes through a secondary deacidification tower to remove the H2S gas produced after hydrolysis, thus achieving the removal of high-concentration sulfides from the desorbed gas. This solution overcomes the challenges of desulfurization agent recycling and integrated fine desulfurization process in treating desorbed gas. Since desorbed gas typically accounts for only 1-1.5% of the blast furnace gas processed, the deacidification tower and hydrolysis tower in the regeneration process require less space, resulting in smaller equipment, reduced investment, and significant economic and environmental benefits.

[0048] Please refer to Figure 1 The original blast furnace gas is passed through an adsorption tower filled with microcrystalline or molecular sieve adsorption materials to remove high concentrations of sulfides such as COS and H2S. The total sulfur content (calculated as elemental S) in the purified gas is reduced to 25 mg / Nm³. 3 The nitrogen gas is then supplied to downstream users via the gas pipeline network. After the adsorbent becomes saturated, hot nitrogen gas at a temperature of 150–180°C enters the adsorption tower after passing through a steam heat exchanger. The high-concentration sulfur-containing gas after desorption first passes through a primary deacidification tower to remove acidic gases such as H2S and Cl-, as well as particulate matter such as dust. This also protects the subsequent hydrolysis catalyst. The desorbed gas after passing through the primary deacidification tower enters the hydrolysis tower, where organic sulfur compounds such as COS are converted into H2S under the action of a catalyst. Then, it enters the secondary deacidification tower to remove H2S gas. Finally, all sulfur-containing gases in the nitrogen gas are removed. The nitrogen gas is then recycled by an induced draft fan, thus realizing the recycling and regeneration of the desulfurization adsorbent and the proper disposal of the desorbed gas.

[0049] Based on the same inventive concept, this invention also proposes a method for the cyclic regeneration of adsorbents in the dry desulfurization process of blast furnace gas. Please refer to [reference needed]. Figure 2 ,include:

[0050] S1: The adsorption tower receives blast furnace gas, adsorbs high-concentration sulfides in the blast furnace gas, and after adsorption saturation, uses heated nitrogen to desorb the adsorbed sulfur-containing substances and outputs the desorbed gas to the multi-stage desorption gas treatment device.

[0051] S2: The multi-stage gas desorption treatment device performs multi-stage treatment on the desorbed gas to remove acidic gases, particulate matter, and sulfur-containing gases, and outputs purified nitrogen to the nitrogen storage device.

[0052] S3: Nitrogen storage device for storing nitrogen;

[0053] S4: The heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The blast furnace gas dry desulfurization adsorbent recycling system proposed in this invention includes an adsorption tower, a multi-stage desorption gas treatment device, a nitrogen storage device, and a heating device. The adsorption tower receives blast furnace gas, adsorbs high-concentration sulfides from the gas, and after adsorption saturation, uses high-temperature nitrogen for desorption, outputting the high-concentration sulfur-containing desorption gas to the multi-stage desorption gas treatment device. The multi-stage desorption gas treatment device processes the blast furnace gas in multiple stages to remove acidic gases, particulate matter, and sulfur-containing gases, and outputs purified nitrogen to the nitrogen storage device. The nitrogen storage device stores nitrogen, and the heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower. This system effectively solves the problem of processing desorption gas from microcrystalline or molecular sieve blast furnace gas fine desulfurization processes, enabling the recycling and reuse of the fine desulfurization adsorbent, extending its adsorption life, reducing replacement frequency, and decreasing investment and operating costs. The use of small-volume nitrogen in the desorption gas effectively reduces energy consumption and improves operational safety.

[0056] The method for recycling and regenerating the adsorbent for dry desulfurization of blast furnace gas proposed in this invention belongs to the same inventive concept as the system for recycling and regenerating the adsorbent for dry desulfurization of blast furnace gas, and therefore has the same beneficial effects, which will not be elaborated here.

[0057] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0058] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A blast furnace gas dry desulfurization adsorbent recycling system, characterized in that, Includes adsorption tower, multi-stage gas desorption treatment unit, nitrogen storage unit, and heating unit; The adsorption tower is used to receive blast furnace gas, adsorb high concentrations of sulfides in the blast furnace gas, and output the desorbed sulfur-containing gas to the multi-stage desorption gas treatment device. The multi-stage desorption gas processing device is used to perform multi-stage processing on the desorbed sulfur-containing gas to remove acidic gases, particulate matter, and sulfur-containing gases, and output purified nitrogen to the nitrogen storage device for recycling. The nitrogen storage device is used to store nitrogen. The heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower.

2. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 1, characterized in that, The multi-stage analytical gas processing device includes a primary deacidification tower for removing acidic gases and particulate matter.

3. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 2, characterized in that, The multi-stage gas processing device also includes a hydrolysis tower for converting organic sulfides into H2S gas under the action of a catalyst.

4. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 3, characterized in that, The multi-stage analytical gas processing device also includes a secondary deacidification tower for removing sulfur-containing gases.

5. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 1, characterized in that, A circulating fan is also provided between the multi-stage gas processing device and the nitrogen storage device to output nitrogen to the nitrogen storage device.

6. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 1, characterized in that, The heating device is a steam heat exchanger.

7. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 1, characterized in that, The nitrogen storage device is a nitrogen storage tank.

8. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 1, characterized in that, The adsorption tower includes an outlet for outputting clean coal gas to the coal gas pipeline network.

9. The blast furnace gas dry desulfurization adsorbent recycling system as described in claim 1, characterized in that, The nitrogen storage device includes an outlet for outputting clean coal gas to the coal gas pipeline network.

10. A method for recycling and regenerating adsorbents in dry desulfurization of blast furnace gas, characterized in that, include: The adsorption tower receives blast furnace gas, adsorbs high concentrations of sulfides in the blast furnace gas, and after adsorption saturation, uses heated nitrogen to desorb the adsorbed sulfur-containing substances and outputs the desorbed gas to a multi-stage desorption gas treatment device. The multi-stage gas desorption treatment device performs multi-stage treatment on the desorbed gas to remove acidic gases, particulate matter, and sulfur-containing gases, and outputs purified nitrogen to the nitrogen storage device. Nitrogen storage devices store nitrogen. The heating device heats the nitrogen in the nitrogen storage device and delivers it to the adsorption tower.

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