Reaction kettle waste heat recycling device in sulfuric acid production

Abstract

The invention discloses a reaction kettle waste heat recycling device in sulfuric acid production, which comprises a first reaction kettle, a second reaction kettle, a stock bin, a converging bin, a rotating pipe and a heat conducting disc, high-temperature gas generated by the first reaction kettle enters the heat conducting disc through a gas inlet pipe, and a plurality of groups of mutually parallel grooves are formed in the heat conducting disc; the side wall of the rotating pipe is clamped in the rotating pipe, the two ends of the rotating pipe are connected with the stock bin and the gathering bin respectively, the rotating pipe can rotate around the axis of the rotating pipe, the driving mechanism drives the rotating pipe to rotate, the spiral blades on the inner wall convey materials, and the device distributes the stock bin catalyst to the rotating pipes to be independently heated and then gathers and guides the catalyst into the second reaction kettle. The partition plates in the heat conduction disc form a labyrinth type gas path, the gas retention time is prolonged, the heat transfer effect is improved, in addition, rolling bodies are arranged at the clamping positions of the rotating pipes and the grooves, the sealing and limiting functions are achieved, stable operation of the device is guaranteed, and efficient recycling of waste heat is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sulfuric acid production, in particular to a device for recycling waste heat of a reactor in sulfuric acid production. Background Art

[0002] During sulfuric acid production, the conversion of sulfur dioxide to sulfur trioxide typically occurs in a reactor. This highly exothermic reaction generates a significant amount of heat. Traditionally, this waste heat has not been fully and effectively utilized, resulting in energy waste. Furthermore, significant additional energy is required to maintain temperature requirements in other production steps, leading to high energy consumption in sulfuric acid production.

[0003] Furthermore, existing material transportation methods for sulfuric acid production are inefficient and difficult to effectively integrate with waste heat utilization. For example, during material transportation, waste heat generated by the reactor cannot be fully absorbed, which not only wastes heat resources but also potentially affects subsequent reaction efficiency and product quality.

[0004] Existing catalyst preheating and delivery systems have numerous drawbacks. The common single-tube preheating method concentrates the catalyst within the tube, limiting its contact area with the heat source. This results in uneven heating and low efficiency, making it difficult to fully activate the catalyst, which in turn affects the reaction efficiency and product quality of sulfuric acid production.

[0005] Therefore, it is of great practical significance to develop a device that can efficiently recycle the waste heat of the reactor and has a stable and reliable material transportation function. Summary of the Invention

[0006] In order to solve the technical problems existing in the background technology, the present invention proposes a device for recycling waste heat of a reactor in sulfuric acid production.

[0007] The present invention proposes a device for recycling waste heat from a reactor in sulfuric acid production, which aims to efficiently utilize the waste heat generated by the reactor to preheat the catalyst, thereby improving energy utilization efficiency and catalyst activity, while ensuring the stability and reliability of the device operation.

[0008] A device for recycling waste heat from reactors in sulfuric acid production comprises a first reactor, a second reactor, a silo, a collecting silo, a rotating pipe and a heat conducting plate.

[0009] An air inlet pipe is connected between the first reactor and the heat-conducting plate, an air outlet pipe is connected to the other side of the heat-conducting plate, and a discharge pipe is connected between the converging chamber and the second reactor. A highly exothermic reaction occurs in the first reactor, converting sulfur dioxide into sulfur trioxide. The generated high-temperature gas enters the heat-conducting plate through the air inlet pipe and is discharged through the air outlet pipe after completing heat exchange within the heat-conducting plate.

[0010] The heat transfer plate has a groove on its top, and the sidewalls of the rotating tube snap into place with the groove. One end of the rotating tube is connected to the bottom of the silo, and the other end is connected to the collection chamber. The connection points at both ends of the rotating tube are designed to allow the rotating tube to rotate around its own axis. The silo contains catalyst, and this connection and rotation design of the rotating tube facilitates the transportation and preheating of the catalyst.

[0011] The heat transfer plate is equipped with a drive mechanism that drives all rotating tubes to rotate about their own axes. Spiral blades are installed on the inner walls of the rotating tubes, which transport the material axially as the rotating tubes rotate. The drive mechanism drives the rotating tubes, and the spiral blades propel the catalyst within the rotating tubes, transporting the catalyst from the silo to the collection bin.

[0012] Preferably, the grooves and rotating tubes are provided in multiple groups, each group of the grooves are parallel to each other, and each group of the grooves is clamped with a group of rotating tubes, and the two ends of each group of the rotating tubes are respectively connected to the silo and the convergence tube, and the connection parts at both ends rotate around their own axes. The key purpose of setting up multiple groups of rotating tubes is to first divert the catalyst in the silo so that the catalyst is dispersed into each rotating tube. Compared with a single rotating tube, the catalyst in each rotating tube can be heated independently after diversion, which greatly increases the contact area between the catalyst and the high-temperature gas, thereby significantly improving the heating efficiency. After being fully heated, the catalyst is then collected in the convergence silo and finally introduced into the second reactor through the discharge pipe to participate in the reaction.

[0013] Preferably, the drive mechanism includes a motor and a worm. The motor drives the worm, and each set of rotating tubes is provided with a turbine on its outer wall, each set of turbines meshing with the worm. The motor drives the worm, and through the meshing of the worm and turbine, all rotating tubes rotate synchronously, ensuring consistent and stable catalyst delivery.

[0014] Preferably, a rolling element is installed at the junction between the groove and the side wall of the rotating tube to reduce friction during the rotation of the rotating tube. The provision of the rolling element effectively reduces resistance during the rotation of the rotating tube, reduces energy loss, and improves the operating efficiency of the device.

[0015] The connection between the rotating tube and the groove should preferably provide adequate sealing and axial retention to prevent radial movement or separation from the groove during rotation, ensuring the proper operation of the entire structure and stable heat transfer performance. Good sealing prevents catalyst leakage, while the axial retention ensures stable rotation of the rotating tube, thereby ensuring effective heat transfer.

[0016] Preferably, the heat conducting disc's inner cavity is equipped with multiple baffles to control gas flow, creating a circuitous path as the gas passes through the cavity, thereby extending its residence time. The inlet and outlet pipes are located at either end of this circuitous path. Multiple baffles are provided, distributed axially or radially along the disc's inner cavity, forming a labyrinthine gas flow path. This design allows the high-temperature gas to flow fully within the disc, increasing its contact time and area with the rotating tubes, improving heat transfer efficiency, and facilitating catalyst preheating.

[0017] The present invention proposes a device for recycling waste heat from a reactor in sulfuric acid production. The device of the present invention realizes efficient recycling of waste heat from the reactor through ingenious structural design, can uniformly preheat the catalyst, disperse the catalyst into various rotating tubes, increase the contact area with the heat conducting plate, enhance the preheating effect, improve the activity of the catalyst and the reaction efficiency of sulfuric acid production, and at the same time ensure the stability and reliability of the device operation, with significant energy saving and production efficiency improvement effects.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the transfer tube of the present invention;

[0021] Figure 3 Schematic diagram of the structure of the heat conducting plate in the present invention;

[0022] Figure 4 A top view of the inner cavity of the heat conducting plate of the present invention;

[0023] Explanation of the numbers in the figure: 1. First reactor; 2. Second reactor; 3. Silo; 4. Heat transfer plate; 401. Air inlet pipe; 402. Air outlet pipe; 403. Groove; 404. Partition; 5. Rotating pipe; 501. Turbine; 502. Bearing; 503. Motor; 504. Worm; 6. Converging bin; 601. Discharge pipe. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and are not to be construed as limiting the present invention.

[0025] like Figures 1-4The device for recycling waste heat from reactors in sulfuric acid production is shown. During the sulfuric acid production process, a highly exothermic reaction of converting sulfur dioxide into sulfur trioxide occurs in the first reactor 1, generating a large amount of high-temperature gas. This high-temperature gas enters the inner cavity of the heat conducting plate 4 through the air inlet pipe 401.

[0026] The heat conducting plate 4 is provided with a plurality of partitions 404 distributed axially or radially, forming a labyrinthine gas flow path, in which the high temperature gas flows in a circuitous manner, greatly extending the residence time in the heat conducting plate 4.

[0027] Catalyst is stored in silo 3. Motor 503 is activated, driving worm 504. Because turbines 501 on the outer walls of each set of rotating tubes 5 mesh with worm 504, the rotation of worm 504 drives all rotating tubes 5 to rotate synchronously around their axes. The ends of the rotating tubes 5 are connected to silo 3 and collection chamber 6, respectively, via bearings 502. Spiral blades on the inner walls of the rotating tubes 5 rotate with them, distributing the catalyst in silo 3 to each of the rotating tubes 5.

[0028] The catalyst is heated independently within each rotating tube 5. Compared to a single rotating tube 5, the multi-tube design significantly increases the contact area between the catalyst and the high-temperature gas, significantly improving heating efficiency. The fully preheated catalyst is transported by the rotating tubes 5 into the collection chamber 6 and then directed through the discharge pipe 601 into the second reactor 2 to participate in the reaction. The gas, after heat exchange, is discharged from the heat transfer plate 4 through the outlet pipe 402.

[0029] Throughout this process, the rolling element at the junction of groove 403 and the sidewall of rotating tube 5 reduces friction and improves rotational efficiency. The sealing and axial limiting function of the junction between rotating tube 5 and groove 403 prevent catalyst leakage and shaking of rotating tube 5, ensuring stable operation and heat transfer performance of the device.

[0030] Through the above specific embodiments, the device for recycling waste heat of a reactor in sulfuric acid production of the present invention realizes efficient utilization of waste heat of the reactor and efficient preheating of the catalyst, thereby effectively improving energy utilization efficiency and reaction efficiency of sulfuric acid production.

[0031] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for recycling waste heat from reactors in sulfuric acid production, comprising a first reactor (1), a second reactor (2), a silo (3), a collection silo (6), a rotating pipe (5), and a heat conducting plate (4); An air inlet pipe (401) is connected between the first reactor (1) and the heat conducting plate (4), an air outlet pipe (402) is connected to the other side of the heat conducting plate (4), and a discharge pipe (601) is connected between the converging bin (6) and the second reactor (2); A groove (403) is provided on the upper side of the heat conducting plate (4), and the side wall of the rotating tube (5) forms a snap-fitting relationship with the groove (403) on the upper surface of the heat conducting plate (4). One end of the rotating tube (5) is connected to the bottom of the silo (3), and the other end is connected to the collecting silo (6). The connection parts at both ends of the rotating tube (5) are designed to allow the rotating tube (5) to rotate around its own axis. The heat conducting plate (4) is provided with a driving mechanism for driving all rotating tubes (5) to rotate around their own axes. The inner walls of the rotating tubes (5) are provided with spiral blades, which transport the material in the axial direction as the rotating tubes (5) rotate.

2. The device for recycling waste heat from a reactor in sulfuric acid production according to claim 1, characterized in that: The grooves (403) and the rotating tubes (5) are provided in multiple groups, each group of the grooves (403) are parallel to each other, each group of the grooves (403) is clamped with a group of rotating tubes (5), and both ends of each group of the rotating tubes (5) are respectively connected to the silo (3) and the converging pipe, and the connection parts at both ends rotate around their own axes.

3. The device for recycling waste heat from a reactor in sulfuric acid production according to claim 1, wherein: The driving mechanism comprises a motor (503) and a worm (504), wherein the motor (503) is used to drive the worm (504) to rotate, and each set of the rotating tubes (5) is provided with a turbine (501) on the outer wall thereof, and each set of the turbines (501) is meshed with the worm (504).

4. The device for recycling waste heat from a reactor in sulfuric acid production according to claim 1, wherein: A rolling body is installed at the clamping point between the groove (403) and the side wall of the rotating tube (5) to reduce the friction force during the rotation of the rotating tube (5).

5. The device for recycling waste heat from a reactor in sulfuric acid production according to claim 4, characterized in that: The clamping portion between the rotating tube (5) and the groove (403) must have a certain sealing property and axial limiting function to prevent radial shaking or separation from the groove (403) during the rotation process, thereby ensuring the normal operation of the entire structure and the stability of the heat conduction performance.

6. The device for recycling waste heat from a reactor in sulfuric acid production according to claim 1, characterized in that: A plurality of partitions (404) are provided in the inner cavity of the heat conducting plate (4) for controlling the flow direction of the gas so that the gas forms a circuitous path when flowing through the inner cavity, thereby extending the residence time. The air inlet pipe (401) and the air outlet pipe (402) are respectively located at the two ends of the circuitous path.

7. The device for recycling waste heat from a reactor in sulfuric acid production according to claim 6, characterized in that: The partitions (404) are provided in plurality and distributed along the axial direction or radial direction of the inner cavity of the heat conducting plate (4) to form a labyrinth-type gas flow path.

Images