A short-stop heating safety emission device for SO2 converter
By designing a gas distribution plate, a heating plate, and a catalyst plate in the short-stop heating safety emission device of the SO2 converter, uniform heating and catalysis of SO2 gas in each reaction unit are achieved, solving the problems of low conversion efficiency and low catalyst utilization caused by uneven temperature, and improving conversion rate and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING SHUANGXIANG ELECTRONIC MATERIALS CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-31
AI Technical Summary
During short-term shutdowns of the SO2 converter, the temperature of the heated SO2 flue gas is uneven during its contact with the catalyst layer, resulting in low conversion efficiency and low catalyst utilization.
A short-stop heating and safe emission device for an SO2 converter is adopted, which includes a reaction unit inside a cylindrical conversion shell, and is equipped with a gas distribution plate, a heating plate and a catalyst plate. Through uniform flow distribution and the design of heating holes and catalytic holes, SO2 gas is ensured to be uniformly heated and catalyzed in each reaction unit to achieve synchronous reaction.
It improves the conversion efficiency of SO2 gas and the utilization rate of catalyst, ensures a consistent gas temperature in each reaction unit, enhances the catalytic effect, and increases the conversion rate.
Smart Images
Figure CN224573529U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of SO2 processing, specifically to a short-stop heating safety emission device for an SO2 converter. Background Technology
[0002] SO2 is a toxic gas and one of the main pollutants that contribute to acid rain. It irritates the respiratory tract, damages vegetation, corrodes buildings, and readily reacts with other substances in the atmosphere to form fine particulate matter such as PM2.5, harming human health and the ecological environment. In actual factory production, SO2 flue gas is converted into SO3 flue gas using an SO2 converter and further fixed as sulfuric acid (or sulfate). This is not only the core chemical reaction in the sulfuric acid industry but also a key means of controlling air pollution and realizing sulfur resource recovery.
[0003] During the operation of the SO2 converter, the plant may experience temporary malfunctions, maintenance, or periodic adjustments that result in brief shutdowns. In such cases, it is necessary to heat the converter to quickly restore catalyst activity, ensure reaction efficiency, and prevent damage to the equipment or catalyst.
[0004] In existing technology, before SO2 flue gas is introduced into the SO2 converter, it is first centrally heated using a tubular heat exchanger to bring its temperature to the catalyst activation temperature. Then, the heated SO2 flue gas is released from the tubular heat exchanger and directly introduced into the SO2 converter, where it sequentially contacts layers of catalyst. These catalyst layers are uniformly distributed with catalysts (i.e., vanadium pentoxide). The following problems arise during this process:
[0005] 1. As the heated SO2 flue gas passes through the SO2 converter, it gradually heats up through the reaction as it comes into contact with the layers of catalyst. This causes the temperature of the flue gas to exceed the active temperature of the catalyst, thus affecting the conversion efficiency.
[0006] 2. When the heated SO2 flue gas is introduced into the SO2 converter, because the pipeline transporting the SO2 flue gas is oriented towards the middle of the catalyst layer, the SO2 flue gas initially contacts the middle of the catalyst layer before gradually spreading to other parts of the catalyst layer. However, during this process, the SO2 flue gas that initially contacts the middle of the catalyst layer reacts and transforms into SO3 before the SO2 flue gas that gradually spreads to other parts of the catalyst layer. This results in the SO2 flue gas entering the SO2 converter having different conversion times in each catalyst layer, which can easily lead to asynchronous reactions between the catalyst layer and the SO2 flue gas, resulting in low catalyst utilization on the catalyst layer and thus affecting the conversion rate. Utility Model Content
[0007] The present invention aims to provide a short-stop heating safety emission device for SO2 converters to solve the technical problems existing in the prior art.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A short-stop heating safety emission device for an SO2 converter includes a cylindrical conversion shell that is hollow. Several reaction units are evenly arranged along the axial direction inside the conversion shell. Each reaction unit, from bottom to top, is connected to an inlet pipe, a gas distribution plate, a heating plate, a catalyst plate, and an outlet pipe. The gas distribution plate has a funnel-shaped longitudinal section and several gas distribution holes for evenly distributing SO2 gas. The heating plate has several heating holes for heating SO2 gas to pass through and be sprayed towards the catalyst plate. The catalyst plate has catalyst holes for catalytic oxidation of the SO2 gas.
[0010] Furthermore, the upper end of the air intake pipe is connected to a funnel-shaped outward expansion channel, the shape of which corresponds to the shape of the air distribution plate, and the air distribution plate is located inside the outward expansion channel; the lower end of the air outlet pipe is connected to an inverted funnel-shaped inward contraction channel.
[0011] Furthermore, the sidewall of the air distribution plate is inclined, and all air distribution holes are evenly distributed on the sidewall of the air distribution plate, with all air distribution holes facing the heating plate.
[0012] Furthermore, an electric heating wire mesh is fixed inside the heating hole, and the electric heating wire mesh is made of nickel-chromium alloy.
[0013] Furthermore, an upper screen is fixed to the top of the catalytic hole, a lower screen is fixed to the bottom of the catalytic hole, and catalyst is filled between the upper screen and the lower screen.
[0014] The beneficial effects of this utility model are as follows:
[0015] In this invention, when the SO2 converter short-stop heating safety emission device restarts after a short stop, the heating holes begin to heat. Once the temperature of the heating holes reaches the catalytic activation temperature, SO2 gas is introduced through the inlet pipe of the reaction unit located at the bottom of the converter housing. The SO2 gas first passes through the gas distribution holes on the gas distribution plate, ensuring uniform distribution, and then passes evenly through the heating holes on the heating plate, heating it to the catalytic activation temperature. Finally, it passes through the catalytic holes on the catalyst plate. During this process, O2 gas is simultaneously introduced into the inlet pipe. The catalytic holes accelerate the oxidation reaction between SO2 and O2, with some SO2 and O2 being oxidized into SO3 gas. After passing through the catalyst holes, the SO2 gas is discharged through the outlet pipe. The discharged gas is cooled by existing equipment (such as an exchanger or condenser, but not limited to these) and then enters through the inlet pipe of the adjacent reaction unit. At this time, the temperature of the cooled gas is basically the same as that of the gas introduced into the bottom reaction unit, which is lower than the temperature of the heating holes on the heating plate. This ensures that the temperature of the gas after being heated by the heating holes is the active temperature of the catalyst, so that the catalytic effect of the catalyst holes on the catalyst plate is better, which is conducive to improving the conversion efficiency.
[0016] Furthermore, the gas distribution plate in the several reaction units of the SO2 converter short-stop heating safety emission device of this invention can evenly distribute SO2 gas, allowing it to pass evenly through the heating plate and the catalyst plate. This ensures that the SO2 gas undergoes uniform diffusion before reaching the catalyst plate, enabling it to contact the catalytic pores on the catalyst plate as simultaneously as possible. This makes the conversion time of SO2 gas on the catalyst plate of each reaction unit as consistent as possible, further synchronizing the reaction between the catalyst plate and the SO2 gas. This maximizes the utilization rate of the catalyst and thus improves the conversion rate.
[0017] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description
[0018] Figure 1 This is a top view of a short-stop heating safety emission device for an SO2 converter according to this utility model;
[0019] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of CC;
[0020] Figure 3 for Figure 2Enlarged view of point A in the middle;
[0021] Figure 4 for Figure 2 Enlarged diagram of point B in the middle.
[0022] In the diagram: 1. Converter housing; 2. Inlet pipe; 3. Outlet pipe; 41. Gas distribution plate; 411. Gas distribution hole; 42. Heating plate; 421. Heating hole; 422. Heating wire mesh; 43. Catalyst plate; 431. Upper screen; 432. Lower screen; 433. Catalyst; 5. Outward expansion channel; 6. Inward contraction channel; 7. Heating pipe. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0026] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0027] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.
[0028] Please see Figures 1-4 This utility model provides a technical solution: a short-stop heating safety emission device for an SO2 converter, comprising a cylindrical conversion shell 1, which is hollow. Four reaction units are evenly arranged along the axial direction inside the conversion shell 1. From bottom to top, each reaction unit is connected to an inlet pipe 2, a gas distribution plate 41, a heating plate 42, a catalyst plate 43, and an outlet pipe 3. The gas distribution plate 41 has a funnel-shaped longitudinal section and is provided with several gas distribution holes 411 for evenly distributing SO2 gas. The heating plate 42 is provided with several heating holes 421 for heating SO2 gas to pass through and be sprayed towards the catalyst plate 43. The catalyst plate 43 is provided with catalyst holes for catalytic oxidation of SO2 gas. In this utility model, both the inlet pipe 2 and the outlet pipe 3 are provided with four pipes.
[0029] When the SO2 converter short-stop heating safety emission device of this utility model restarts after a short stop, the heating hole 421 starts heating. When the temperature of the heating hole 421 reaches the catalytic activation temperature, SO2 gas is introduced from the air inlet pipe 2 located at the bottom of the reaction unit of the conversion shell 1. The SO2 gas first passes through the air distribution holes 411 on the air distribution plate 41, so that the SO2 gas is evenly distributed, and then evenly passes through the heating holes 421 on the heating plate 42, so that the SO2 gas is heated to the catalytic activation temperature, and then passes through the catalytic holes on the catalyst plate 43. During this process, O2 gas is simultaneously introduced into the air inlet pipe 2. The catalytic holes make the oxidation reaction of SO2 gas and O2 gas faster, and some SO2 gas and O2 gas are oxidized into SO3 gas. After passing through the catalyst holes, the SO2 gas is discharged through the outlet pipe 3. The discharged gas is cooled by existing equipment (such as an exchanger or condenser, but not limited to these) and then enters through the inlet pipe 2 of the adjacent reaction unit. At this time, the temperature of the cooled gas is basically the same as that of the gas introduced into the bottom reaction unit, that is, lower than the temperature of the heating holes 421 on the heating plate 42. This ensures that the temperature of the gas heated by the heating holes 421 is the active temperature of the catalyst, so that the catalytic effect of the catalyst holes on the catalyst plate 43 is better, which is conducive to improving the conversion efficiency.
[0030] Furthermore, the gas distribution plate 41 in the several reaction units of the SO2 converter short-stop heating safety emission device of this invention can evenly distribute SO2 gas, allowing it to pass evenly through the heating plate 42 and the catalyst plate 43. This ensures that the SO2 gas undergoes uniform diffusion before reaching the catalyst plate 43, enabling it to contact the catalytic pores on the catalyst plate 43 as simultaneously as possible. Consequently, the conversion time of SO2 gas on the catalyst plate 43 in each reaction unit is made as consistent as possible, further synchronizing the reaction between the catalyst plate 43 and the SO2 gas. This maximizes the utilization rate of the catalyst and thus improves the conversion rate.
[0031] In addition to heating SO2 gas using heating plate 42, this invention can also employ a heating method where heating pipe 7 extends into the reaction unit to directly heat the SO2 gas. Specifically, heating pipe 7 is a single pipe, with heating wires installed inside. Heating the heating wires heats the outer wall of heating pipe 7. After entering from conversion housing 1, heating pipe 7 passes through four reaction units sequentially, and the outer wall of heating pipe 7 heats the SO2 gas in the four reaction units.
[0032] In this embodiment: the upper end of the air intake pipe 2 is connected to an outward expansion channel 5 in the shape of a funnel. The shape of the outward expansion channel 5 corresponds to the shape of the air distribution plate 41, and the air distribution plate 41 is located inside the outward expansion channel 5. The lower end of the air outlet pipe 3 is connected to an inward contraction channel 6 in the shape of an inverted funnel.
[0033] After entering the intake pipe 2, the gas diffuses within the outward expansion channel 5 and passes through several air distribution holes 411 on the air distribution plate 41, which helps to evenly distribute the gas. As the gas passes through the inward contraction channel 6, it is gradually concentrated under the guidance of the inward contraction channel 6, causing the gas flow rate to gradually increase and accelerating the gas discharge efficiency.
[0034] In this embodiment, the sidewall of the gas distribution plate 41 is inclined, and all gas distribution holes 411 are evenly distributed on the sidewall of the gas distribution plate 41, with all gas distribution holes 411 facing the heating plate 42. SO2 and O2 gases passing through the air inlet channel 2 are blocked by the gas distribution plate 41, diffuse along the outward expansion channel 5, move along the sidewall of the gas distribution plate 41, and finally pass through the gas distribution holes 411 facing the heating plate 42. With this structure, the gas distribution holes 411 can provide a uniform flow of SO2 gas.
[0035] In this embodiment, an electric heating wire mesh 422 is fixedly installed inside the heating hole 421. The electric heating wire mesh 422 is made of nickel-chromium alloy. With this structure, SO2 gas can be heated and passed through the heating hole 421 and sprayed toward the catalyst plate 43. In addition, since nickel-chromium alloy has good corrosion resistance and high temperature resistance, it can adapt to highly acidic and high-temperature environments.
[0036] In this embodiment, a power supply and a switch are also included. The power supply is electrically connected to the switch, and the switch is electrically connected to the heating wire mesh 422. The power supply powers the heating wire mesh 422, and the switch controls the on / off state of the circuit. In this embodiment, the power supply model can be TDK-Lambda Genesys GPR-600-5. When the switch is turned on, the present invention is started, and the heating wire mesh 422 can begin to heat up. With this structure, the heating hole 421 can start heating simultaneously when the present invention restarts after a short stop.
[0037] In this embodiment: an upper screen 431 is fixed at the top of the catalytic hole, and a lower screen 432 is fixed at the bottom of the catalytic hole. A catalyst 433 is filled between the upper screen 431 and the lower screen 432. The catalyst 433 used in this embodiment can be vanadium pentoxide. Gas injected from the heating hole 421 can pass through the catalytic hole and react with the catalyst 433 filled between the upper screen 431 and the lower screen 432. With this structure, the catalytic hole can supply SO2 gas for catalysis. Furthermore, filling the space between the upper screen 431 and the lower screen 432 with the catalyst 433 prevents the catalyst 433 from being blown away by the upward blowing of gas, thus affecting the catalytic reaction.
[0038] The above are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A SO2 converter short stop heating safety venting device, characterized in that, The device includes a cylindrical conversion shell that is hollow. Several reaction units are evenly arranged inside the conversion shell along its axial direction. Each reaction unit is connected from bottom to top to an inlet pipe, a gas distribution plate, a heating plate, a catalyst plate, and an outlet pipe. The gas distribution plate has a funnel-shaped longitudinal section and several gas distribution holes for evenly distributing SO2 gas. The heating plate has several heating holes for heating SO2 gas to pass through and be sprayed toward the catalyst plate. The catalyst plate has catalyst holes for catalytic oxidation of SO2 gas.
2. The SO2 converter short-stop heating safety emission device according to claim 1, characterized in that: The upper end of the air intake pipe is connected to a funnel-shaped outward expansion channel, the shape of which corresponds to the shape of the air distribution plate, and the air distribution plate is located inside the outward expansion channel. The lower end of the air outlet pipe is connected to an inverted funnel-shaped inward contraction channel.
3. The SO2 converter short-stop heating safety emission device according to claim 1, characterized in that: The sidewall of the air distribution plate is inclined, and all air distribution holes are evenly distributed on the sidewall of the air distribution plate, with all air distribution holes facing the heating plate.
4. The SO2 converter short-stop heating safety emission device according to claim 1, characterized in that: An electric heating wire mesh is fixed inside the heating hole, and the electric heating wire mesh is made of nickel-chromium alloy.
5. The SO2 converter short-stop heating safety emission device according to claim 1, characterized in that: An upper screen is fixed to the top of the catalytic hole, and a lower screen is fixed to the bottom of the catalytic hole. The space between the upper screen and the lower screen is filled with catalyst.