System for preparing sulfur by catalytically removing sulfur dioxide

Abstract

The utility model discloses a system for preparing sulfur by catalytically removing sulfur dioxide, and belongs to the technical field of energy conservation and environmental protection. The system is sequentially provided with a dust removal section, a catalytic reactor and a sulfur generation section from left to right, a metal filter screen is arranged in the dust removal section, and the sulfur generation section is composed of a circulating water cooling section and an ice-water bath quenching section. By adopting the device, the sulfur dioxide in the flue gas can be efficiently removed, meanwhile, sulfur resources in the industrial flue gas are converted into sulfur with a high additional value, and economic benefits are increased while environmental protection is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of industrial flue gas multi-pollutant treatment and sulfur resource utilization, and in particular to a system for catalytically removing sulfur dioxide to produce sulfur. Background Art

[0002] ZL200410056878.3 proposes a method and apparatus for the forced oxidation of calcium sulfite, an intermediate product in flue gas desulfurization. Air generated by an oxidizing air generator is pumped into a slurry tank. A side-injection agitator is placed between the outlet of each air lance and the tank wall. This method reduces power consumption and ensures efficient forced oxidation. The unoxidized calcium hemihydrate sulfite in the final product of the absorption tower forced oxidation system is less than 0.1%, resulting in a high oxidation efficiency and ensuring the operational efficiency of the wet desulfurization system and the quality of the byproducts. This device removes sulfur dioxide from industrial flue gas, but produces byproducts such as desulfurized gypsum, which creates secondary pollution. ZL200610090638.4 proposes a method for desulfurizing flue gas from coal-fired boilers. This method uses industrial and agricultural waste as a desulfurizer and adds it to the boiler during coal combustion. This method achieves flue gas desulfurization while consuming a large amount of waste. While this method can alleviate the problem of large-scale waste pollution, the desulfurization effect is poor and it does not effectively utilize the sulfur resources in industrial flue gas.

[0003] Therefore, this patent proposes a system for catalytically removing sulfur dioxide to produce sulfur. This system removes pollutants such as sulfur dioxide and smoke from industrial flue gas. Simultaneously, through catalysis, circulating water cooling, and condensation, it converts sulfur resources in industrial flue gas into high-value-added sulfur, reducing process energy consumption while significantly increasing economic benefits. Utility Model Content

[0004] In order to solve the above-mentioned defects and deficiencies in the prior art, the utility model proposes a system for catalytically removing sulfur dioxide to produce sulfur, which solves the pollution problem of sulfur dioxide in industrial flue gas and realizes the high-value utilization of sulfur resources in industrial flue gas.

[0005] A system for catalytically removing sulfur dioxide to produce sulfur. The system comprises, from left to right, a dust removal section, a catalytic reactor and a sulfur production section. The dust removal section is provided with a metal filter, and the sulfur production section consists of a circulating water cooling section and an ice water bath quenching section.

[0006] In the above system: an electromagnetic vibration controller is provided on the top of the dust removal section, an ash hopper is provided at the bottom, and an ash discharge device is provided under the ash hopper.

[0007] In the above system: a catalyst layer is provided in the catalytic reactor.

[0008] In the above system, a circulating water pipe is provided outside the circulating water cooling section pipe body, an ice water bath pipe is provided outside the ice water bath rapid cooling section pipe body, and the bottom of the tail end of the sulfur generating section is a sulfur collecting bin.

[0009] In the above system: the ice water bath quenching section is arranged obliquely and has a ceramic layer on the inner surface.

[0010] In the above system: the filtration accuracy of the metal filter is 3~10 μm.

[0011] In the above system, the tilt angle θ of the ice-water bath quenching section is 5-15°.

[0012] (1) The utility model adopts catalytic dry desulfurization to replace the mainstream limestone-gypsum wet desulfurization process, achieving high-efficiency desulfurization while avoiding the secondary pollution (desulfurization gypsum) problem of wet flue gas desulfurization.

[0013] (2) The circulating water cooling and ice water bath rapid cooling process layout is adopted, which eliminates the equipment layout of the flue gas heat exchanger, reduces investment and operating costs, and achieves a reduction in flue gas temperature. The treated flue gas can meet the emission standards.

[0014] (3) The sulfur dioxide pollutants in the flue gas are eventually converted into high-value product sulfur, realizing the resource utilization of sulfur in industrial flue gas, effectively alleviating my country's dependence on foreign sulfur resources, and increasing economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model relates to a system for catalytically removing sulfur dioxide to produce sulfur.

[0016] Meaning of the reference numerals: 1 is the dust removal section, 2 is the catalytic reactor, 3 is the sulfur production section, 4 is the metal filter, 5 is the electromagnetic vibration controller, 6 is the ash hopper, 7 is the ash discharge device, 8 is the catalyst layer, 9 is the circulating water pipeline, 10 is the ice water bath pipeline, 11 is the ceramic layer, and 12 is the sulfur collection bin. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the following embodiments, but the scope of protection of the present invention is not limited thereto:

[0018] like Figure 1Figure 2 shows a system for catalytically removing sulfur dioxide to produce sulfur. From left to right, the system comprises a dust removal section 1, a catalytic reactor 2, and a sulfur production section 3. The dust removal section 1 is equipped with a metal filter 4, while the sulfur production section 3 consists of a circulating water cooling section and an ice-water quenching section. An electromagnetic vibration controller 5 is located at the top of the dust removal section 1, and an ash hopper 6 is located at the bottom. An ash discharge device 7 is located below the ash hopper. A catalyst layer 8 is located within the catalytic reactor 2. A circulating water pipeline 9 is located outside the circulating water cooling section, and an ice-water quenching section is equipped with an ice-water bath pipeline 10. A sulfur collection bin 12 is located at the bottom of the sulfur production section 3. The ice-water quenching section is arranged at an angle and has a ceramic layer 11 on its inner surface. The metal filter 4 has a filtration accuracy of 3 to 10 μm. The tilt angle θ of the ice-water quenching section is 5 to 15°.

[0019] The specific operating process is as follows: the first section of the system is the dust removal section 1, the second section is the catalytic reactor 2, and the third section is the sulfur generation section 3. After the flue gas removes particulate matter in the dust removal section, it enters the catalytic reactor. The catalytic reactor is followed by the sulfur generation section. Solid sulfur is collected at the bottom outlet of the sulfur generation section, and the treated flue gas is piped into the subsequent process sections. The catalyst in the catalyst layer 8 is a rare earth-based catalyst with cerium Ce and lanthanum La as the main active components. The ice-water bath pipe 10 circulates an ice-water mixture. The ceramic layer 11 is made of alumina ceramic.

[0020] Industrial flue gas enters the system through pipelines and first passes through a metal filter with a micron-level filtration accuracy to trap dust. After long-term operation, dust accumulated on the metal filter is shaken off by an electromagnetic vibration controller. The trapped and shaken dust falls into the ash hopper below for discharge, effectively preventing dust from clogging the pores of the catalyst layer in the catalytic reactor and affecting catalytic efficiency. The dedusted industrial sulfur-containing flue gas then passes through the rare earth-based catalyst layer, where the sulfur dioxide in the flue gas is catalytically converted into gaseous sulfur. The sulfur-containing flue gas then enters the sulfur generation section. The gaseous sulfur is first cooled in a circulating water cooling section to initially lower the flue gas temperature, further reducing the temperature of the flue gas in the subsequent ice water bath quenching section and enhancing the cooling effect. Finally, the flue gas is rapidly cooled in the ice water bath cooling section, where the gaseous sulfur condenses into solid sulfur, which then falls onto the smooth, angled ceramic layer below. The solid sulfur eventually slides into a sulfur collection bin for unified collection. The dedusted and desulfurized flue gas is finally discharged at a low temperature.

[0021] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the above-disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions for the implementation of the present invention and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose that can be achieved by the present utility model.

Claims

1. A system for catalytically removing sulfur dioxide to produce sulfur, characterized by: The system is provided with a dust removal section (1), a catalytic reactor (2) and a sulfur production section (3) from left to right, wherein a metal filter (4) is provided in the dust removal section (1), and the sulfur production section (3) is composed of a circulating water cooling section and an ice water bath quenching section.

2. The system for catalytically removing sulfur dioxide to produce sulfur according to claim 1, characterized in that: An electromagnetic vibration controller (5) is provided at the top of the dust removal section (1), an ash hopper (6) is provided at the bottom, and an ash discharge device (7) is provided below the ash hopper.

3. The system for catalytically removing sulfur dioxide to produce sulfur according to claim 1, characterized in that: A catalyst layer (8) is provided in the catalytic reactor (2).

4. The system for catalytically removing sulfur dioxide to produce sulfur according to claim 1, characterized in that: A circulating water pipe (9) is provided outside the circulating water cooling section pipe body, an ice water bath pipe (10) is provided outside the ice water bath rapid cooling section pipe body, and a sulfur collecting bin (12) is provided at the bottom of the tail end of the sulfur generating section (3).

5. The system for catalytically removing sulfur dioxide to produce sulfur according to claim 1, characterized in that: The ice-water bath quenching section is arranged obliquely and has a ceramic layer (11) provided on its inner surface.

6. The system for catalytically removing sulfur dioxide to produce sulfur according to claim 1, characterized in that: The filtration accuracy of the metal filter (4) is 3~10 μm.

7. The system for catalytically removing sulfur dioxide to produce sulfur according to claim 1, characterized in that: The tilt angle θ of the ice-water bath quenching section is 5~15°.

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