Preparation system for sulfur trioxide

Abstract

The utility model discloses a preparation system for sulfur trioxide. The preparation system comprises a mixing assembly, a reaction tower, a first heat exchanger and a second heat exchanger, the reaction tower internally comprises a baffling space, a first reaction space, a first heat exchange space, a second reaction space and a second heat exchange space which are sequentially arranged from top to bottom and are communicated, a zigzag flow channel is arranged in the baffling space, and catalysts are arranged in the first reaction space and the second reaction space; the first heat exchanger and the second heat exchanger are arranged in the first heat exchange space and the second heat exchange space respectively. The reacted high-temperature gas exchanges heat with the newly input mixed gas in the first heat exchange space and the second heat exchange space respectively, so that the mixed gas is preheated, the high-temperature gas is cooled, a cooler is not required to be arranged between the reactions, and the cost is reduced. Moreover, high-temperature gas generated by the reaction after the reaction is started can preheat newly input mixed gas, heating through a heater is not needed, and the equipment cost and the energy consumption cost are saved.

Description

System for the preparation of sulfur trioxide Technical Field

[0001] This application belongs to the field of chemical production equipment technology, specifically relating to a system for preparing sulfur trioxide. Background Technology

[0002] Sulfur trioxide is typically produced by the reaction of sulfur dioxide with oxygen. In industrial production, sulfur trioxide can be prepared using air or pure oxygen as the oxidant. When using air as the oxidant, the oxygen in the air reacts with sulfur dioxide, and nitrogen needs to be separated after the reaction is complete. Using pure oxygen as the oxidant allows chemical equilibrium to be reached in a shorter time, and there is no need to separate excess nitrogen, making subsequent processing relatively simple.

[0003] Because the reaction between sulfur dioxide and oxygen requires a catalyst and a high-temperature environment, existing sulfur trioxide preparation systems typically require heaters and reactors. The heaters are used to heat the reactant gases to the required reaction temperature. In multi-stage sulfur trioxide preparation equipment, since the reaction between oxygen and sulfur dioxide in the reactor causes the gas temperature to rise, a cooler is also needed after each reactor to lower the gas temperature to the required reaction range, thus facilitating subsequent reactions. Therefore, existing multi-stage sulfur trioxide preparation equipment has a complex structure and high equipment cost. Summary of the Invention

[0004] The technical problem this application aims to solve is that existing multi-stage reaction equipment for preparing sulfur trioxide has many structures and high costs. To solve this technical problem, this application provides a low-cost system for preparing sulfur trioxide.

[0005] The technical solution proposed in this application is as follows:

[0006] A system for preparing sulfur trioxide, comprising:

[0007] A mixing component for mixing oxygen and sulfur dioxide to form a mixed gas;

[0008] The reaction tower includes, from top to bottom, a baffled space, a first reaction space, a first heat exchange space, a second reaction space, and a second heat exchange space that are arranged and connected in sequence. The baffled space is provided with a tortuous flow channel, and the output end of the flow channel is connected to the input end of the first reaction space. Both the first reaction space and the second reaction space are provided with catalysts.

[0009] A first heat exchanger and a second heat exchanger are respectively disposed in the first heat exchange space and the second heat exchange space, and the mixing component is connected to the input end of the second heat exchanger, the output end of the second heat exchanger is connected to the input end of the first heat exchanger, and the output end of the first heat exchanger is connected to the input end of the flow channel.

[0010] Using the aforementioned sulfur trioxide preparation system, the mixing component inputs a mixture of oxygen and sulfur dioxide into the flow channel. After thorough mixing within the channel, the mixture sequentially flows through a first reaction space, a first heat exchange space, a second reaction space, and a second heat exchange space. During its passage through the first and second reaction spaces, a reaction occurs under the action of a catalyst to generate sulfur trioxide. The high-temperature gas produced after the reaction exchanges heat with the newly input mixed gas in the first and second heat exchange spaces, respectively, thus preheating the mixed gas and cooling the high-temperature gas. In this way, multi-stage reactions are achieved without the need for coolers between reactions. Furthermore, the high-temperature gas generated after the reaction begins can preheat the newly input mixed gas, eliminating the need for further heating by a heater, thereby saving equipment and energy costs.

[0011] Furthermore, the flow deflector space is provided with a first deflector plate and a second deflector plate. The first deflector plate and the second deflector plate are disposed on the inner walls of opposite sides of the flow deflector space and both extend toward the inner wall of the opposite side. The first deflector plate and the second deflector plate are arranged at intervals in the vertical direction to form the flow channel.

[0012] Furthermore, an air inlet is provided at the top of the reaction tower, and the output end of the first heat exchanger is connected to the air inlet;

[0013] In the vertical direction, the first baffle and the second baffle block the air inlet.

[0014] Furthermore, the mixing assembly includes a mixing tank, an air inlet pipe, and an air intake fan. The mixing tank has an oxygen inlet and a sulfur dioxide inlet. One end of the air inlet pipe is connected to the interior of the mixing tank through the air intake fan, and the other end is connected to the input end of the second heat exchanger.

[0015] Furthermore, it also includes a first gas supply component and a second gas supply component, wherein the first gas supply component is connected to the oxygen inlet and the second gas supply component is connected to the sulfur dioxide inlet.

[0016] Furthermore, it also includes a preheater, which is disposed between the mixing assembly and the reaction tower for preheating the mixed gas.

[0017] Furthermore, it also includes multiple drawer layers, which are arranged sequentially in the vertical direction in the first reaction space, and each drawer layer is detachably arranged and each drawer layer can hold a catalyst.

[0018] Furthermore, it also includes a porous partition, which is disposed in the second reaction space and is capable of supporting and placing the catalyst.

[0019] Furthermore, an outlet is provided at the bottom of the reaction tower;

[0020] The preparation system also includes a waste heat boiler and a condensation mechanism. The input end of the waste heat boiler is connected to the gas outlet, and the output end of the waste heat boiler is connected to the input end of the condensation mechanism.

[0021] Furthermore, both the first heat exchanger and the second heat exchanger are plate heat exchangers. Attached Figure Description

[0022] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0023] Figure 1 is a schematic diagram of the structure of a sulfur trioxide preparation system provided in an embodiment of this application.

[0024] Label Explanation:

[0025] 110. Mixing assembly; 120. Reaction tower; 121. Baffle space; 122. First reaction space; 123. First heat exchange space; 124. Second reaction space; 125. Second heat exchange space; 126. Flow channel; 127. First baffle plate; 128. Second baffle plate; 131. First heat exchanger; 132. Second heat exchanger; 141. First connecting pipe; 142. Second connecting pipe; 150. Drawer layer; 160. Porous partition. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment 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 application.

[0028] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] As shown in Figure 1, this application discloses a system for preparing sulfur trioxide, including a mixing component 110, a reaction tower 120, a first heat exchanger 131 and a second heat exchanger 132.

[0030] The mixing component 110 is used to mix oxygen and sulfur dioxide to form a mixed gas. The molar ratio of oxygen to sulfur dioxide in the mixed gas needs to be 1:2 to facilitate the subsequent reaction of oxygen and sulfur dioxide to produce sulfur trioxide.

[0031] The reaction tower 120 internally includes, from top to bottom, a baffled space 121, a first reaction space 122, a first heat exchange space 123, a second reaction space 124, and a second heat exchange space 125, arranged and connected in sequence. The baffled space 121 has a tortuous flow channel 126 to further mix the mixed gas entering the flow channel 126; the output end of the flow channel 126 is connected to the input end of the first reaction space 122, and both the first reaction space 122 and the second reaction space 124 contain catalysts. Thus, the mixed gas reacts separately in the first reaction space 122 and the second reaction space 124 after further mixing, which can improve the reaction efficiency.

[0032] The first heat exchanger 131 and the second heat exchanger 132 are respectively disposed in the first heat exchange space 123 and the second heat exchange space 125, and the mixing component 110 is connected to the input end of the second heat exchanger 132, the output end of the second heat exchanger 132 is connected to the input end of the first heat exchanger 131, and the output end of the first heat exchanger 131 is connected to the input end of the flow channel 126.

[0033] Furthermore, the sidewall of the reaction tower 120 is provided with a first inlet, a first outlet, a second inlet, and a second outlet; the preparation system also includes a first connecting pipe 141 and a second connecting pipe 142. The mixing component 110 is connected to the first inlet, which is connected to the inlet of the second heat exchanger 132 to input the mixed gas into the second heat exchanger 132; the outlet of the second heat exchanger 132 is connected to the first outlet; both ends of the first connecting pipe 141 are connected to the first outlet and the second inlet, respectively; the second inlet is connected to the inlet of the first heat exchanger 131, so that the mixed gas output from the second heat exchanger 132 enters the first heat exchanger 131 through the first connecting pipe 141; the second outlet is connected to the outlet of the first heat exchanger 131; both ends of the second connecting pipe 142 are connected to the second outlet and the inlet, respectively, so that the mixed gas output from the first heat exchanger 131 enters the flow channel 126 through the second connecting pipe 142.

[0034] It should be noted that heat is released during the reaction of sulfur dioxide and oxygen to produce sulfur trioxide under the action of a catalyst. The mixed gas before the reaction passes sequentially through the second heat exchanger 132 and the first heat exchanger 131, while the gas after the reaction passes through the first heat exchange space 123 and the second heat exchange space 125. The first heat exchanger 131 transfers the heat from the gas after the reaction in the first heat exchange space 123 to the mixed gas inside the first heat exchanger 131, and the second heat exchanger 132 transfers the heat from the gas after the reaction in the second heat exchange space 125 to the mixed gas inside the second heat exchanger 132. In this way, the heat from the gas after the reaction is transferred to the mixed gas before the reaction through the heat exchangers, thereby preheating the mixed gas to the temperature required for the reaction; at the same time, it also reduces the temperature after the reaction, ensuring that the temperature of the gas after the reaction meets the temperature requirements of subsequent reactions or processes.

[0035] Using the aforementioned sulfur trioxide preparation system, the mixing component 110 inputs a mixed gas of oxygen and sulfur dioxide into the flow channel 126. After thorough mixing within the flow channel 126, the gas flows sequentially through the first reaction space 122, the first heat exchange space 123, the second reaction space 124, and the second heat exchange space 125. While passing through the first reaction space 122 and the second reaction space 124, a reaction occurs under the action of a catalyst to generate sulfur trioxide. The high-temperature gas produced after the reaction exchanges heat with the newly input mixed gas in the first heat exchange space 123 and the second heat exchange space 125, respectively, achieving both preheating of the mixed gas and cooling of the high-temperature gas. Thus, while achieving multi-stage reactions, there is no need to install coolers between reactions. Furthermore, the high-temperature gas generated after the reaction begins can preheat the newly input mixed gas, eliminating the need for further heating by a heater, thereby saving equipment and energy costs.

[0036] In addition, after the mixed gas is input into the reaction tower 120, it first enters the tortuous flow channel 126, where the mixed gas can be fully mixed, thereby improving the reaction effect in the subsequent reaction space.

[0037] In one embodiment, the mixing assembly 110 includes a mixing tank, an inlet pipe, and an air intake fan. The mixing tank has an oxygen inlet and a sulfur dioxide inlet. Oxygen is introduced into the mixing tank through the oxygen inlet, and sulfur dioxide is introduced into the mixing tank through the sulfur dioxide inlet, thereby allowing the oxygen and sulfur dioxide to be initially mixed within the mixing tank. One end of the inlet pipe is connected to the interior of the mixing tank via the air intake fan, and the other end is connected to the inlet of the second heat exchanger 132, so that the mixed gas is introduced into the second heat exchanger 132 along the inlet pipe by the induced draft fan.

[0038] Furthermore, the preparation system also includes a first gas supply component and a second gas supply component. The first gas supply component is connected to an oxygen inlet, and the second gas supply component is connected to a sulfur dioxide inlet. Therefore, the first gas supply component is used to provide oxygen, and the second gas supply component is used to provide sulfur dioxide.

[0039] In one embodiment, the preparation system further includes a preheater disposed between the mixing assembly 110 and the reaction tower 120. The preheater preheats the mixed gas to ensure its temperature reaches the required reaction temperature. It should be noted that the preheater operates at the start of the preparation system's operation. At startup, there is no high-temperature gas from the reaction in the reaction tower 120 to preheat the mixed gas; therefore, preheating is necessary. Furthermore, it can be determined that after the high-temperature gas generated by the reaction preheats the newly input mixed gas through a heat exchanger at the start of the reaction, the preheater can be shut off to reduce energy costs.

[0040] In one embodiment, the top of the reaction tower 120 has an air inlet connected to the input end of the flow channel 126, and the output end of the first heat exchanger 131 is connected to the air inlet to introduce the mixed gas into the flow channel 126. The bottom of the reaction tower 120 has an air outlet connected to the second heat exchange space 125 to discharge the reacted gas. Specifically, the air inlet and the air outlet are located at the middle positions of the top and bottom of the reaction tower 120, respectively.

[0041] In one embodiment, a first baffle plate 127 and a second baffle plate 128 are provided within the flow deflection space 121. The first baffle plate 127 and the second baffle plate 128 are arranged vertically at intervals and are disposed on opposite inner walls of the flow deflection space 121. Both the first baffle plate 127 and the second baffle plate 128 extend toward the opposite inner wall to form the aforementioned flow channel 126. For example, in Figure 1, the first baffle plate 127 is located above the second baffle plate 128. The first baffle plate 127 is connected to the right inner wall and extends toward the left inner wall, while the second baffle plate 128 is connected to the left inner wall and extends toward the right inner wall.

[0042] Furthermore, in the vertical direction, the first baffle 127 and the second baffle 128 block the air inlet. In this way, the mixed gas input from the air inlet will first impact the first baffle 127, and then flow in a tortuous manner through the extended flow channel 126, thereby ensuring that oxygen and sulfur dioxide are fully mixed through the flow channel 126.

[0043] In one embodiment, the preparation system further includes multiple drawer layers 150, which are arranged vertically in sequence in the first reaction space 122. Each drawer layer 150 is detachable, meaning it can be removed from the reaction tower 120. Each drawer layer 150 can hold a catalyst. Thus, the number of drawer layers 150 can be set according to the reaction requirements, controlling material costs while achieving the target reaction requirements, i.e., avoiding the use of excessive catalyst.

[0044] It should be noted that the drawer layer 150 adopts a drawer-like design. For example, multiple tracks are set in the first reaction space 122 of the reaction tower 120, and an opening communicating with the first reaction space 122 is opened on the side wall of the reaction tower 120. The drawer layer 150 slides on the tracks and is inserted into or pulled out of the first reaction space 122 through the opening. In addition, to ensure airtightness, a sealing cover can be set at the opening. When it is necessary to add or remove the drawer layer 150, the sealing cover can be opened; after the arrangement of the drawer layer 150 is completed, the sealing cover can be closed to seal the opening.

[0045] In one embodiment, the preparation system further includes a porous partition 160 disposed in the second reaction space 124. The porous partition 160 is capable of supporting and placing a catalyst, thereby enabling the gas to enter the second heat exchange space 125 through the porous partition 160 while simultaneously catalyzing the reaction of oxygen and sulfur dioxide. Similarly, the portion of the drawer layer 150 used to support the catalyst can also be designed with openings, as long as the pore size is smaller than the size of the catalyst to prevent it from falling out.

[0046] In one embodiment, both the first heat exchanger 131 and the second heat exchanger 132 are plate heat exchangers.

[0047] In one embodiment, the preparation system further includes a waste heat boiler and a condensation mechanism. The input end of the waste heat boiler is connected to the gas outlet to receive the gas output from the reaction tower 120 and reuse the heat of the output gas to further reduce energy consumption and reduce costs. The condensation mechanism can condense the gas to condense sulfur trioxide into liquid or solid state, which facilitates the storage and transportation of sulfur trioxide.

[0048] It should be noted that the heat recovered by the waste heat boiler can be used for other processes that require preheating or heating. Of course, if the heat of the gas output from the reaction tower 120 is low and the benefit of reuse is lower than the equipment cost, then the waste heat boiler may not be installed, and the gas output from the reaction tower 120 may be directly transported to the condensation mechanism.

[0049] To facilitate understanding of the technical solution of this application, the process flow of the sulfur trioxide preparation system in the above embodiments is described herein with reference to Figure 1:

[0050] When the mixture is first used, the preheater preheats the mixed gas delivered by the mixing component 110. The preheated mixed gas passes through the second heat exchanger 132, the first connecting pipe 141, the first heat exchanger 131 and the second connecting pipe 142 in sequence and enters the input end of the flow channel 126. The mixed gas is further mixed in the flow channel 126.

[0051] The further mixed gas then passes sequentially through the first reaction space 122, the first heat exchange space 123, the second reaction space 124, and the second heat exchange space 125. Within the first and second reaction spaces 122 and 124, the mixed gas reacts under the action of a catalyst to produce sulfur trioxide, and the temperature of the reacted gas rises. Within the first and second heat exchange spaces 123 and 125, the reacted gas exchanges heat with the newly introduced mixed gas through the first and second heat exchangers 131 and 132. After heat exchange is complete, the reacted gas is output from the outlet at the bottom of the reaction tower 110.

[0052] Understandably, after the reacted gas exchanges heat with the newly input mixed gas through the first heat exchanger 131 and the second heat exchanger 132, the preheater can be shut off to reduce energy consumption costs. It should also be noted that the gas flow in the preparation system can be achieved by either a blower structure on the upstream side or an induced draft structure on the downstream side; no restriction is imposed here.

[0053] In summary, the sulfur trioxide preparation system provided in this application has at least the following advantages:

[0054] 1. The high-temperature gas after the reaction can exchange heat with the newly input mixed gas, thereby cooling the high-temperature gas and preheating the mixed gas, reducing equipment costs and energy consumption costs.

[0055] 2. The gas input into the reaction tower 120 is transported along the tortuous flow channel 126, where it is fully mixed, thereby improving the subsequent reaction effect;

[0056] 3. The drawer layer 150 is designed to be detachable, so that the number of drawer layers 150 can be arranged according to the reaction requirements, thereby controlling costs while achieving the target reaction effect;

[0057] 4. The gas output from reaction tower 120 is condensed into liquid or solid state by a condensation mechanism, which facilitates the storage and transportation of sulfur trioxide.

[0058] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for preparing sulfur trioxide, characterized in that, include: A mixing component is used to mix oxygen and sulfur dioxide to form a mixed gas; a reaction tower includes, from top to bottom, a baffled space, a first reaction space, a first heat exchange space, a second reaction space, and a second heat exchange space that are arranged and connected in sequence. The baffled space has a tortuous flow channel, and the output end of the flow channel is connected to the input end of the first reaction space. Both the first reaction space and the second reaction space contain catalysts; a first heat exchanger and a second heat exchanger are respectively arranged in the first heat exchange space and the second heat exchange space, and the mixing component is connected to the input end of the second heat exchanger, the output end of the second heat exchanger is connected to the input end of the first heat exchanger, and the output end of the first heat exchanger is connected to the input end of the flow channel.

2. The system for preparing sulfur trioxide according to claim 1, characterized in that, The flow deflector space is provided with a first deflector plate and a second deflector plate. The first deflector plate and the second deflector plate are disposed on the inner walls of opposite sides of the flow deflector space and both extend toward the inner wall of the opposite side. The first deflector plate and the second deflector plate are arranged at intervals in the vertical direction to form the flow channel.

3. The system for preparing sulfur trioxide according to claim 2, characterized in that, The top of the reaction tower is provided with an air inlet, and the output end of the first heat exchanger is connected to the air inlet; in the vertical direction, the first baffle and the second baffle block the air inlet.

4. The system for preparing sulfur trioxide according to claim 1, characterized in that, The mixing assembly includes a mixing tank, an air inlet pipe, and an air intake fan. The mixing tank has an oxygen inlet and a sulfur dioxide inlet. One end of the air inlet pipe is connected to the inside of the mixing tank through the air intake fan, and the other end is connected to the input end of the second heat exchanger.

5. The system for preparing sulfur trioxide according to claim 4, characterized in that, It also includes a first gas supply component and a second gas supply component, wherein the first gas supply component is connected to the oxygen inlet and the second gas supply component is connected to the sulfur dioxide inlet.

6. The system for preparing sulfur trioxide according to claim 1, characterized in that, It also includes a preheater, which is disposed between the mixing assembly and the reaction tower for preheating the mixed gas.

7. The system for preparing sulfur trioxide according to claim 1, characterized in that, It also includes multiple drawer layers, which are arranged sequentially in the vertical direction in the first reaction space, and each drawer layer is detachably arranged and each drawer layer can hold a catalyst.

8. The system for preparing sulfur trioxide according to claim 1, characterized in that, It also includes a porous partition, which is disposed in the second reaction space and is capable of supporting and placing the catalyst.

9. The system for preparing sulfur trioxide according to claim 1, characterized in that, The reaction tower has an outlet at the bottom; the preparation system also includes a waste heat boiler and a condensation mechanism, the input end of the waste heat boiler is connected to the outlet, and the output end of the waste heat boiler is connected to the input end of the condensation mechanism.

10. The system for preparing sulfur trioxide according to claim 1, characterized in that, Both the first heat exchanger and the second heat exchanger are plate heat exchangers.

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