A sulfur-burning acid-making system

Abstract

A sulfuric acid system for burning sulfur, comprising a sulfur temporary storage tank, a gasification igniter, a sulfur combustion chamber, a Venturi injector, a reactor, an acid making tower, an alkali washing tower, the sulfur temporary storage tank is connected with the gasification igniter through a sulfur metering pump, the gasification igniter is connected with the sulfur combustion chamber, the sulfur combustion chamber is connected with the gas chamber of the Venturi injector through a pipeline I, the bottom end of the Venturi injector is connected with the inlet of the reactor through a reaction tube, the gas outlet of the reactor is connected with the gas inlet of the acid making tower through a pipeline III, the liquid outlet of the acid making tower is connected with the liquid chamber of the Venturi injector through a pipeline IV, the liquid outlet of the reactor is connected with a sulfurous acid storage tank through a pipeline V, the upper gas outlet of the acid making tower is connected with the gas inlet of the alkali washing tower through a pipeline VI, the two liquid inlets of the alkali washing tower are connected with alkali liquor and water through control valves respectively, and a circulating pipeline and an alkali washing tower circulating pump are connected between the lower liquid outlet of the alkali washing tower and the upper liquid inlet of the alkali washing tower. The utility model can improve the raw material utilization rate, reduce the acid making cost and reduce pollution.

Description

Technical Field

[0001] This utility model relates to the field of sulfurous acid preparation technology, and in particular to a sulfur combustion acid production system. Background Technology

[0002] Currently, the starch industry mainly uses sulfur combustion to produce sulfurous acid for soaking corn. Sulfur is burned in air to generate sulfur dioxide, which is then absorbed by water to obtain sulfurous acid. Currently, the industry commonly uses spray absorption towers to absorb sulfur dioxide. The sulfur dioxide gas generated from combustion enters the spray absorption tower from the bottom, while water is sprayed downwards from the top, which can increase the contact time between water and sulfur dioxide gas to some extent. However, this existing acid production system has limited contact area and time between water and sulfur dioxide gas. The spray absorption tower only absorbs sulfur dioxide through a single counter-current contact, and the overall absorption efficiency is only about 90%. A large amount of unabsorbed sulfur dioxide gas, if directly emitted into the air with the exhaust gas, will pollute the environment. Installing an exhaust gas recirculation system after the spray absorption tower to absorb the unabsorbed sulfur dioxide gas can reduce environmental pollution, but the low absorption efficiency will also reduce raw material utilization. Furthermore, the high sulfur dioxide content in the exhaust gas requires a large amount of alkali solution for absorption, leading to increased acid production costs. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the existing technology by providing a sulfur combustion acid production system that can effectively improve the absorption efficiency of sulfur dioxide gas, increase the utilization rate of raw materials, reduce the cost of acid production, and reduce environmental pollution.

[0004] The technical solution adopted by this utility model to achieve the above objectives is as follows: a sulfur combustion acid production system, including a sulfur storage tank, a gasification igniter, a sulfur combustion chamber, a Venturi injector, a reactor, an acid production tower, and an alkaline washing tower. The sulfur storage tank is connected to the gasification igniter via a sulfur metering pump. The gasification igniter is then connected to the sulfur combustion chamber. The outlet of the sulfur combustion chamber is connected to the gas chamber of the Venturi injector via pipe I. The bottom end of the Venturi injector is connected to the reactor inlet via a reaction pipe. One outlet of the reactor is connected to a pipe... Ⅲ is connected to the gas inlet of the acid production tower. The liquid outlet of the acid production tower is connected to the liquid chamber of the Venturi ejector through pipe Ⅳ. A jet pump is connected in pipe Ⅳ. The water inlet of the acid production tower is connected to the process water. The liquid outlet of the reactor is connected to the sulfurous acid storage tank through pipe Ⅴ. The gas outlet at the top of the acid production tower is connected to the gas inlet of the alkaline washing tower through pipe Ⅵ (18). The two liquid inlets of the alkaline washing tower are connected to the alkaline solution and water through control valves respectively. A circulation pipe is connected between the liquid outlet on the lower side and the liquid inlet on the upper side of the alkaline washing tower. An alkaline washing tower circulation pump is connected in the circulation pipe.

[0005] A further technical solution of this utility model is: the air inlet of the sulfur combustion chamber is connected to air through a regulating valve, a water cooling system is provided on the outer wall of the sulfur combustion chamber, the water inlet of the water cooling system is connected to circulating cooling water, and the water outlet of the water cooling system is connected to circulating cooling return water.

[0006] A further technical solution of this utility model is: one of the gas outlets of the reactor is connected to the gas chamber of the Venturi injector through pipe II, and a regulating valve is connected in pipe II.

[0007] A further technical solution of this utility model is: one outlet of the reactor is connected to the inlet of the acid production tower through pipe VII, and an automatic control valve is connected in pipe VII.

[0008] A further technical solution of this utility model is: a sulfurous acid transfer pump is connected in pipeline V between the reactor and the sulfurous acid storage tank.

[0009] A further technical solution of this utility model is: one outlet of the acid production tower is connected to one inlet of the alkali washing tower through pipe VIII, and an automatic control valve is connected in pipe VIII. An automatic control valve is also connected in the pipe through which the acid production tower receives process water.

[0010] This utility model provides a sulfur combustion and acid production system with the following advantages: 1. A gasification igniter is installed at the front end of the sulfur combustion chamber. Liquid sulfur undergoes primary oxygen-deficient combustion with a small amount of air within the gasification chamber of the igniter. Simultaneously, the unburned portion forms vaporized sulfur. The vaporized sulfur and the air supplied by the fan achieve homogeneous high-speed swirling mixing in the cyclone sulfur combustion chamber, quickly achieving uniform composition and temperature, and enabling efficient and complete combustion even under conditions of low excess air coefficient; 2. A water cooling system is installed on the outer wall of the sulfur combustion chamber. During sulfur combustion, the combustion gases are carried away by the external water cooling system. Heat is used to control the overall combustion temperature below 450℃, inhibiting the formation of sublimated sulfur and SO3, and reducing the negative impact of harmful components on the process; 3. A Venturi injector is installed at the front end of the reactor, and the reactor is also equipped with a return pipe II to the Venturi injector. When sulfur dioxide gas comes into contact with water, a large number of bubbles are generated in the Venturi injector, the Venturi injector diffuser, the reaction tube, and inside the reactor, which can effectively increase the contact area and time between sulfur dioxide gas and water, effectively improving the absorption rate of sulfur dioxide gas, that is, improving the sulfur utilization rate; 4. The acid production tower returns to the liquid chamber of the Venturi injector through pipe IV. The reactor returns to the Venturi ejector liquid chamber through pipe II, forming a multi-stage circulating absorption system with the Venturi ejector (which utilizes jet negative pressure to enhance gas-liquid mixing), the reactor, and the acid production tower. Simultaneously, the reactor tail gas and the acid production tower liquid are recycled back to the Venturi ejector, achieving bidirectional gas-liquid recycling and further improving the sulfur dioxide absorption rate. Through "strong gas-liquid mixing in the Venturi ejector + gas-liquid contact with foam in the reactor + liquid return from the acid production tower," bidirectional gas-liquid transmission is achieved. This system can achieve a sulfur dioxide absorption rate of over 99.5%, solving the problem of low absorption efficiency in traditional methods. 5. Using gas... The equipment features an integrated system for ignition, combustion, and chemical treatment, resulting in a high degree of automation. It automatically ignites or shuts down with a single button based on the incoming acid production water. The equipment can be started and stopped immediately, and multiple pipelines utilize automatic control valves. All equipment control can be performed from the central control room's computer, enabling unattended operation on-site. The acid concentration and sulfur combustion intensity have a wide adjustable range with minimal fluctuations. A single unit can meet the normal production needs of a factory. The acid concentration can be precisely controlled by automatically adjusting the equipment's process parameters. Furthermore, the system only requires a single addition of sulfur to the molten sulfur pool, and automatically adjusts the amount of sulfur burned as needed, reducing the workload for workers.

[0011] The present invention provides a sulfur combustion acid production system in further detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the process flow of a sulfur combustion acid production system according to this utility model;

[0013] Explanation of reference numerals: 1-Sulfur temporary storage tank, 2-Sulfur metering pump, 3-Gasification igniter, 4-Sulfur combustion chamber, 5-Pipeline I, 6-Venturi injector, 7-Pipeline II, 8-Acid production tower, 9-Reaction tube, 10-Pipeline III, 11-Reactor, 12-Pipeline IV, 13-Ejector pump, 14-Pipeline V, 15-Pipeline VII, 16-Sulfurous acid transfer pump, 17-Pipeline VIII, 18-Pipeline VI, 19-Alkali washing tower, 20-Alkali washing tower circulation pump, 21-Circulation pipeline. Detailed Implementation

[0014] like Figure 1 As shown, this utility model discloses a sulfur combustion acid production system for producing sulfurous acid by burning sulfur. This utility model includes a sulfur storage tank 1, a gasification igniter 3, a sulfur combustion chamber 4, a Venturi injector 6, a reactor 11, an acid production tower 8, and an alkali washing tower 19.

[0015] like Figure 1 As shown, the sulfur storage tank 1 is connected to the gasification igniter 3 via the sulfur metering pump 2, and the gasification igniter 3 is then connected to the sulfur combustion chamber 4. The air inlet of the sulfur combustion chamber 4 is connected to air via a regulating valve, which is connected to a fan. The regulating valve can adjust the amount of air entering the chamber. A water cooling system is installed on the outer wall of the sulfur combustion chamber 4. The water cooling system is an external water jacket (not shown in the figure). The water inlet of the water cooling system is connected to circulating cooling water, and the water outlet is connected to circulating cooling return water. The sulfur storage tank 1 is used to store sulfur. Solid sulfur is added to the sulfur storage tank 1, and an electric heating device (not shown in the figure) in the sulfur storage tank 1 melts the solid sulfur into liquid sulfur. The sulfur metering pump 2 delivers the liquid sulfur to the gasification chamber of the gasification igniter 3. Using the sulfur metering pump 2 to deliver liquid sulfur allows for more precise adjustment of the sulfur combustion rate.

[0016] The outlet of sulfur combustion chamber 4 is connected to the gas chamber of Venturi injector 6 via pipe I5. The gas chamber of Venturi injector 6 is located near the lower side of the injector, while the liquid chamber is located near the upper side. Venturi injector 6 is existing equipment, and its internal structure will not be described in detail here. The bottom end of Venturi injector 6 is connected to the inlet of reactor 11 via reaction pipe 9. One outlet of reactor 11 is connected to the gas chamber of Venturi injector 6 via pipe II7. A regulating valve is connected in pipe II7 between the outlet of reactor 11 and the gas chamber of Venturi injector 6. The other outlet of reactor 11 is connected to the inlet of acid treatment tower 8 via pipe III10. The liquid outlet of acid treatment tower 8 is connected to the liquid chamber of Venturi injector 6 via pipe IV12. A jet pump 13 is connected in pipe IV12. The water inlet of acid treatment tower 8 is connected to process water. The outlet of reactor 11 is connected to a sulfurous acid storage tank via pipe V14. A sulfurous acid transfer pump 16 is connected to pipe V14. The sulfurous acid storage tank is used to store finished sulfurous acid. One outlet of reactor 11 is connected to the inlet of acid production tower 8 via pipe VII15. An automatic control valve is connected to pipe VII15. When the sulfurous acid concentration in reactor 11 is insufficient, the insufficient sulfurous acid solution can first flow into acid production tower 8, and then flow back from acid production tower 8 to the liquid chamber of Venturi injector 6 via pipe IV12 to further absorb sulfur dioxide gas and increase the sulfurous acid concentration.

[0017] The upper outlet of the acid production tower 8 is connected to the inlet of the alkaline washing tower 19 via pipe VI18. The two liquid inlets of the alkaline washing tower 19 are connected to alkaline solution and clean water respectively via automatic control valves. A circulation pipe 21 connects the lower liquid outlet and the upper liquid inlet of the alkaline washing tower 19, and an alkaline washing tower circulation pump 20 is connected in the circulation pipe 21. One liquid outlet of the acid production tower 8 is connected to one liquid inlet of the alkaline washing tower 19 via pipe VIII17. An automatic control valve is connected in pipe VIII17; by intermittently opening the automatic control valve in pipe VIII17, the pH of the liquid in the alkaline washing tower 19 can be appropriately adjusted. An automatic control valve is connected to the pipe connecting the acid production tower 8 to the process water, and this automatic control valve can control the amount of water entering the acid production tower 8.

[0018] The present invention is used to prepare sulfurous acid. First, solid sulfur is added to sulfur storage tank 1 and melted into liquid sulfur by electric heating. Sulfur metering pump 2 delivers liquid sulfur to gasification igniter 3 for primary combustion. The heat generated by combustion vaporizes the liquid sulfur. The gaseous sulfur enters sulfur combustion chamber 4 and is fully mixed with cyclone-type air for secondary combustion to generate sulfur dioxide gas. The sulfur dioxide gas generated in the sulfur combustion chamber 4 first enters the Venturi injector 6 for primary absorption. Pipe IV12, connecting the Venturi injector 6 to the acid production tower 8, injects water or low-concentration sulfurous acid into the Venturi injector 6 via jet pump 13. The water and sulfur dioxide gas come into full contact within the Venturi injector 6, reaction tube 9, and reactor 11. The Venturi injector 6 utilizes high-pressure liquid ejected from the nozzle to form a high-speed liquid flow, creating a certain negative pressure around the nozzle and continuously drawing in sulfur dioxide gas. Relying on the surface friction of the jet and the diffusion of gas molecules, the sulfur dioxide gas, along with the jet, passes through the compression and diffusion tubes of the Venturi injector 6 into the reaction tube 9 and reactor 11. Under intense impact and high turbulence, the sulfur dioxide gas is fully dispersed by the liquid flow and rapidly absorbed, generating a stable concentration of sulfurous acid solution. The tail gas after passing through the Venturi injector 6 and the absorber then enters the acid production tower 8 for secondary absorption. Finally, the exhaust gas is purified by alkaline solution absorption in alkaline scrubbing tower 19 before being discharged, with the sulfur dioxide concentration in the exhaust gas reaching less than 50 mg / m³.

[0019] The above embodiments are merely preferred embodiments of this utility model. The structure of this utility model is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sulfur combustion acid production system, characterized in that, The system includes a sulfur storage tank (1), a gasification igniter (3), a sulfur combustion chamber (4), a Venturi injector (6), a reactor (11), an acid production tower (8), and an alkaline washing tower (19). The sulfur storage tank (1) is connected to the gasification igniter (3) via a sulfur metering pump (2). The gasification igniter (3) is then connected to the sulfur combustion chamber (4). The outlet of the sulfur combustion chamber (4) is connected to the gas chamber of the Venturi injector (6) via pipe I (5). The bottom end of the Venturi injector (6) is connected to the inlet of the reactor (11) via a reaction pipe (9). One outlet of the reactor (11) is connected to the inlet of the acid production tower (8) via pipe III (10). The outlet of the acid production tower (8) is connected to the liquid chamber of the Venturi ejector (6) through pipe IV (12). A jet pump (13) is connected in pipe IV (12). The inlet of the acid production tower (8) is connected to process water. The outlet of the reactor (11) is connected to the sulfurous acid storage tank through pipe V (14). The upper outlet of the acid production tower (8) is connected to the inlet of the alkaline washing tower (19) through pipe VI (18). The two inlets of the alkaline washing tower (19) are connected to alkaline solution and water through control valves respectively. A circulation pipe (21) is connected between the lower outlet and the upper inlet of the alkaline washing tower (19). An alkaline washing tower circulation pump (20) is connected in the circulation pipe (21).

2. The sulfur combustion acid production system as described in claim 1, characterized in that, The air inlet of the sulfur combustion chamber (4) is connected to air through a regulating valve. A water cooling system is installed on the outer wall of the sulfur combustion chamber (4). The water inlet of the water cooling system is connected to circulating cooling water, and the water outlet of the water cooling system is connected to circulating cooling return water.

3. The sulfur combustion acid production system as described in claim 1, characterized in that, One of the outlets of the reactor (11) is connected to the gas chamber of the Venturi injector (6) via pipe II (7), and a regulating valve is connected in pipe II (7).

4. The sulfur combustion acid production system as described in claim 1, characterized in that, One outlet of the reactor (11) is connected to the inlet of the acid production tower (8) via pipe VII (15), and an automatic control valve is connected in pipe VII (15).

5. The sulfur combustion acid production system as described in claim 1, characterized in that, A sulfurous acid transfer pump (16) is connected in pipeline V (14) between the reactor (11) and the sulfurous acid storage tank.

6. The sulfur combustion acid production system as described in claim 1, characterized in that, One outlet of the acid production tower (8) is connected to one inlet of the alkaline washing tower (19) through pipe VIII (17). An automatic control valve is connected in pipe VIII (17), and an automatic control valve is connected in the pipe connecting the acid production tower (8) to the process water.

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