Waste heat low-temperature recovery device and method based on sulfuric acid chemical conversion section

Abstract

The invention discloses a waste heat low-temperature recovery device and method based on a sulfuric acid chemical conversion section, and relates to the field of sulfuric acid processing waste heat recycling, the waste heat low-temperature recovery device comprises a conversion tower, a secondary absorption tower and a low-temperature superheater, and further comprises a phase change waste heat recovery assembly installed between the secondary absorption tower and the low-temperature superheater; and the phase change waste heat recovery assembly is arranged between the secondary absorption tower and the low-temperature superheater. The device has the advantages that low-temperature heat can be effectively utilized, energy loss is reduced, meanwhile, in the heat recovery process, lower-temperature gas with heat absorbed away can be pressurized, heat in the lower-temperature gas is increased, the heat is utilized and used for preheating heated and evaporated water, the evaporation efficiency is improved, and the heat recovery efficiency is improved. And meanwhile, the centrifugal force of the balancing weight is adjusted by adjusting the distance between the balancing weight and the center point of the balancing disc, adjustment is more accurate, adjustment is automatically conducted according to dynamic balance damage, and the influence of vibration of the supercharger on heat conduction is reduced.

Description

Technical Field

[0001] The present invention relates to the field of waste heat recovery and utilization in sulfuric acid processing, and in particular to a low-temperature waste heat recovery device and method based on a sulfuric acid chemical conversion section. Background Art

[0002] The sulfuric acid chemical process is one of the main ways to produce sulfuric acid, involving the oxidation and conversion of raw materials and high-temperature reactions. This process usually generates a large amount of high-temperature exhaust gas and waste heat. If this waste heat is not effectively recovered and utilized, it not only wastes precious energy, but also increases production costs and the burden on the environment. Existing waste heat recovery and utilization devices have a low recovery rate for low-temperature waste heat, which still causes a large amount of heat loss.

[0003] Therefore, publication number CN115235287B discloses an exhaust gas waste heat recovery and utilization device, which includes a waste heat recovery box and a heat exchange loop pipe. The waste heat recovery box is provided with multiple groups of horizontal partitions 1 and 2, and the partitions 1 and 2 are alternately arranged in parallel to divide the chamber in the waste heat recovery box into upper and lower stacked horizontal flow chambers. The uppermost horizontal flow chamber is connected to an inlet, and the lowermost horizontal flow chamber is connected to an outlet. The right end side of the partition 1 is provided with a drainage port 1, and the heat exchange loop pipe is arranged in multiple groups in an array, which are vertically embedded in the partition 1 and the partition 2 respectively.

[0004] The above-mentioned exhaust gas waste heat recovery and utilization equipment makes the flow trajectory of exhaust gas longer under the same volume through the arrangement of heat exchange ring pipe, elastic baffle, connecting pipe 1, connecting pipe 2, partition 1, partition 2 and other structures, and through the use of circulating cleaning and drainage device, the heat exchange time with the gas or liquid to be exchanged is longer. At the same time, through the impact of the exhaust gas flow, the kinetic energy of the exhaust gas is used to make the cleaning and drainage vehicle move along the spiral groove rail ring, and continuously clean the inner tube wall of the heat exchange ring tube in a cycle to avoid the accumulation of dust and particulate matter on the inner tube wall of the heat exchange ring tube, thereby ensuring the cleanliness of the inner tube wall of the heat exchange ring tube, thereby improving the heat exchange conversion rate of the exhaust gas. At the same time, through the action of the baffle fan, the flow trend of the exhaust gas in the heat exchange ring tube is more likely to rush towards the tube wall of the heat exchange ring tube, so that the exhaust gas that has been exchanged with heat is mixed again, thereby accelerating the heat exchange efficiency.

[0005] However, when the above-mentioned waste gas waste heat recovery equipment and existing waste heat recovery equipment are used, the temperature of the gas after heat exchange is low, while the temperature required for water evaporation is high, so the heat in the low-temperature gas cannot be effectively utilized, resulting in heat loss in the low-temperature gas and low heat recovery efficiency.

[0006] Therefore, a new type of waste heat low-temperature recovery device and method based on the sulfuric acid chemical conversion section can be used to solve the shortcomings of the existing technology. Summary of the Invention

[0007] The purpose of the present invention is to solve the problem of low heat recovery rate in the prior art and to propose a low-temperature waste heat recovery device and method based on the sulfuric acid chemical conversion section.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A low-temperature waste heat recovery device and method based on a sulfuric acid chemical conversion section, comprising a conversion tower, a secondary absorption tower, a deaerator, a low-temperature superheater, and a phase change waste heat recovery component installed between the secondary absorption tower and the low-temperature superheater;

[0010] The phase change waste heat recovery component is arranged between the second absorption tower and the low-temperature superheater, and is used to recover the heat in the 150-180°C sulfur trioxide flowing out of the low-temperature superheater, and reduce the temperature of the sulfur trioxide after entering the second absorption tower to 100-130°C. The phase change waste heat recovery component consists of an evaporator and an evaporation mechanism and a preheating mechanism installed on the evaporator. The evaporation mechanism evaporates the deoxygenated water to form steam for use in other sulfuric acid chemical conversion processes. The water in the deoxygenator is 90-110°C and is heated by the SO3 flue gas to generate low-pressure saturated steam. The steam is then introduced into the compressor, consuming electrical energy to increase the temperature and pressure. Deoxygenated water is introduced at the outlet to become superheated steam of 0.2-0.3MPa.A and sent to the user end.

[0011] The preheating mechanism includes a balancing unit, which includes a vibration-damping support fixedly mounted on the evaporator, a booster bottle fixedly mounted on the vibration-damping support, a booster machine matched with the booster bottle mounted on the vibration-damping support, a balancing plate fixedly mounted on the other end of the booster through a first flange, a counterweight assembly matched with the balancing plate mounted on the balancing plate, and an automatic balancing assembly matched with the counterweight assembly mounted on the vibration-damping support.

[0012] Preferably, the evaporation mechanism includes a plurality of U-shaped heat exchange elbows fixedly installed inside the evaporation kettle, two air guide plates are installed in the evaporation kettle for guiding air, and two longitudinal partitions and a transverse partition are installed in the evaporation kettle, the two longitudinal partitions divide the evaporation kettle into three chambers, the evaporation kettle and the low-temperature superheater are connected through a second air inlet pipe, the second air inlet pipe is connected to the second chamber of the evaporation kettle, a water inlet pipe and a steam outlet pipe are fixedly connected to the evaporation kettle, the transverse partition is located in the first chamber, dividing the first chamber into two upper and lower sub-cavities, the water inlet pipe is connected to the lower sub-cavity, and the steam outlet pipe is connected to the upper sub-cavity, the evaporation kettle and the second absorption tower are connected through a second air outlet pipe, and the second air outlet pipe is connected to the third chamber of the evaporation kettle;

[0013] The preheating mechanism includes a preheating sleeve fixedly mounted on the water inlet pipe, the preheating sleeve is fixedly connected to a first air outlet pipe and a first air inlet pipe, the first air outlet pipe is connected to the third cavity of the evaporator, the first air inlet pipe is connected to the second cavity of the evaporator, the booster bottle and the booster are located between the first air inlet pipe and the evaporator, the gas in the first air inlet pipe enters the booster bottle, is pressurized by the booster, and is then introduced into the preheating sleeve.

[0014] Preferably, the counterweight assembly includes a counterweight frame fixedly mounted on the balancing plate through a second flange, a plurality of screws are slidably mounted on the counterweight frame, a counterweight block is fixedly mounted on each of the screws, and a plurality of adjustment mechanisms cooperating with the corresponding screws are mounted on the counterweight frame.

[0015] The adjustment mechanism includes a threaded sleeve rotatably mounted on the counterweight frame and rotatably connected to the screw thread, a first gear cylinder fixedly mounted on the threaded sleeve, a rotating shaft rotatably mounted on the counterweight frame, and a second gear cylinder meshing with the first gear cylinder fixedly mounted on the rotating shaft;

[0016] A first sprocket is fixedly mounted on the rotating shaft, a shaft body 1 and a shaft body 2 are rotatably mounted on the counterweight frame, a third sprocket engaged with the first sprocket is fixedly mounted on the shaft body 1, a second sprocket is fixedly mounted on the shaft body 2, a fourth sprocket engaged with both the second and first sprockets is rotatably mounted on the counterweight frame, a second permanent magnetic disk is fixedly mounted on the shaft body 1, a first permanent magnetic disk is fixedly mounted on the shaft body 2, a second locking structure cooperating with the first permanent magnetic disk is mounted on the counterweight frame, and a first locking structure cooperating with the second permanent magnetic disk is mounted on the counterweight frame.

[0017] Preferably, the first locking structure and the second locking structure are both composed of an elastic telescopic rod, a friction plate and a permanent magnet, and the two permanent magnets on the first locking structure and the second locking structure have opposite magnetic properties, the elastic telescopic rod is fixedly connected to the counterweight frame, the permanent magnet is fixedly connected to the telescopic end of the elastic telescopic rod, and the friction plate is fixedly connected to the permanent magnet, and the two friction plates respectively cooperate with the corresponding first permanent magnetic disk and second permanent magnetic disk.

[0018] Preferably, the automatic balancing assembly includes a pillar mounted on a vibration-damping support through a sliding structure, a first disc is fixedly mounted on the pillar, a second disc is fixedly mounted on the first disc, a support ring is fixedly mounted on the second disc, and the first disc and the support ring are mounted with multiple groups of balancing structures that cooperate with the corresponding first permanent magnetic disk, second permanent magnetic disk and permanent magnet.

[0019] Preferably, the sliding structure includes a fixed frame fixedly mounted on a vibration-damping support, a sliding frame is slidably mounted on the vibration-damping support via a slide rail, the pillar and the sliding frame are fixedly connected, and the pillar and the fixed frame are slidably connected, an electric push rod is fixedly mounted on the fixed frame, the telescopic end of the electric push rod is fixedly connected to the sliding frame, and a support plate for supporting the electric push rod is mounted on the vibration-damping support.

[0020] Preferably, the balancing structure includes a Hall sensor fixedly mounted between the second disc and the support ring, a current controller and a battery block fixedly mounted on the first disc, an electromagnetic block matched with the corresponding first permanent magnetic disk, second permanent magnetic disk and permanent magnet fixedly mounted on the support ring, and the battery block, current controller and electromagnetic block form a closed-loop circuit through wires.

[0021] Preferably, the first flange consists of two flange plates, one of which has a screw rotatably mounted on it, and the other has a nut fixedly mounted on it, each of the screws is fixedly mounted with a gear, and the flange plate on which the screw is rotatably mounted has a gear ring meshing with multiple gears rotatably mounted on it.

[0022] Preferably, an outer cover is fixedly mounted on the first disc, a cover body matching the outer cover is fixedly mounted on the vibration-damping support, and the outer cover and the cover body are spliced ​​together to form a protective cover.

[0023] Preferably, the preheating mechanism includes a preheating sleeve fixedly mounted on the water inlet pipe, the preheating sleeve is fixedly connected to a first air outlet pipe and a first air inlet pipe, the first air outlet pipe is connected to the third cavity of the evaporator, the first air inlet pipe is connected to the second cavity of the evaporator, the booster bottle and the booster are located between the first air inlet pipe and the evaporator, the gas in the first air inlet pipe enters the booster bottle, is pressurized by the booster, and is then introduced into the preheating sleeve.

[0024] The present invention also provides a low-temperature waste heat recovery method based on a sulfuric acid chemical conversion section, comprising the above-mentioned low-temperature waste heat recovery device based on a sulfuric acid chemical conversion section, and further comprising the following steps:

[0025] S1, the original sulfuric acid industrial conversion section system, the SO3 flue gas at the fourth layer outlet of the conversion tower enters the secondary absorption tower after heat exchange in the low-temperature superheater, the temperature entering the secondary absorption tower is 150-180℃, and the outlet temperature after reaction in the secondary absorption tower is 70-100℃, and then passes through the tail absorption tower and enters the tail gas exhaust pipe discharge system.

[0026] After the S2 and SO3 flue gases enter the secondary absorption tower for reaction, the outlet temperature is 70-100°C. The reaction heat of the SO3 flue gas and concentrated sulfuric acid is carried by the concentrated sulfuric acid to the circulating acid pump tank. Since the above heat is not recovered, the temperature of the sulfuric acid is relatively high when it enters the circulating acid pump tank. The concentrated sulfuric acid in the circulating acid pump tank enters the drying tower acid cooler and the finished product acid cooler, which requires a large amount of circulating water to cool the sulfuric acid, thereby increasing the amount of circulating water and the power consumption of the circulating water system.

[0027] S3. At this time, an evaporation mechanism in the phase change waste heat recovery component is installed between the low-temperature superheater and the secondary absorption tower to heat and evaporate the deoxygenated water in the evaporator to remove excess heat from the SO3 flue gas. The SO3 flue gas, after being cooled by the phase change waste heat recovery component, then enters the secondary absorption tower for reaction and finally enters the tail suction system at a lower exhaust temperature.

[0028] In the process of waste heat recovery, a preheating mechanism is also set to preheat the deoxygenated water to speed up the evaporation of the deoxygenated water. At the same time, a booster bottle is set to increase the pressure of SO3 and increase the temperature of SO3, which makes the waste heat recovery more thorough.

[0029] Compared with the existing technology, the advantages of the present invention are:

[0030] 1. When recovering and utilizing waste heat from the sulfuric acid chemical conversion section, this waste heat low-temperature recovery device adds a phase change waste heat recovery component between the low-temperature superheater and the secondary absorption tower to recover the heat in the gas discharged from the low-temperature superheater for generating steam. The generated steam is then used in the sulfuric acid chemical conversion process, effectively utilizing the low-temperature heat and reducing energy loss. At the same time, during the heat recovery process, the even lower-temperature gas from which heat has been absorbed is pressurized to increase the heat in the even lower-temperature gas. This heat is then utilized to preheat the evaporated water and accelerate evaporation efficiency.

[0031] 2. When this waste heat low-temperature recovery device is recovering and utilizing waste heat from the sulfuric acid chemical conversion section, the counterweight and the balance plate are fixed together through the second flange, which facilitates the adjustment of the dynamic balance of the balance plate. At the same time, the counterweight adopts a ring design that surrounds the balance plate, which can effectively avoid the situation where the dynamic balance of the balance plate is destroyed due to uneven distribution of the counterweight, and can effectively improve the stability of the supercharger and reduce the impact of vibration and heat transfer generated by the operation of the supercharger.

[0032] 3. When the waste heat low-temperature recovery device is recovering and utilizing the waste heat in the sulfuric acid chemical conversion section, a screw and a threaded sleeve are set. When the dynamic balance of the balancing plate needs to be adjusted, the distance between the counterweight block and the center of the balancing plate is changed to change the centrifugal force of the counterweight block. Since the adjustment accuracy of the distance between the counterweight block and the center of the balancing plate depends on the pitch accuracy of the screw and the threaded sleeve, the dynamic balance adjustment accuracy is controlled by controlling the pitch accuracy. Compared with adjusting the dynamic balance by adjusting the weight of the counterweight block, this method of adjusting the dynamic balance by adjusting the distance is more accurate.

[0033] 4. When this waste heat low-temperature recovery device is recovering and utilizing waste heat from the sulfuric acid chemical conversion section, a Hall sensor is set to sense the direction of the balance disk's balance destruction, and then a current controller is used to control the direction of the current in the corresponding electromagnetic block, thereby driving the first permanent magnetic disk or the second permanent magnetic disk to rotate, thereby driving the threaded sleeve to rotate, achieving automatic adjustment based on dynamic balance damage, and can effectively adapt to scenarios where dynamic balance destruction is caused by dust adhering to the balance disk.

[0034] In summary, the present invention can effectively utilize low-temperature heat and reduce energy loss. At the same time, during the heat recovery process, it can also pressurize the lower-temperature gas from which heat has been absorbed, increase the heat in the lower-temperature gas, and utilize this part of the heat to preheat the heated and evaporated water, thereby accelerating the evaporation efficiency. At the same time, the centrifugal force of the counterweight block is adjusted by adjusting the distance between the counterweight block and the center point of the balance disk, and the adjustment is more precise. At the same time, it is automatically adjusted according to the damage of the dynamic balance, thereby reducing the influence of the supercharger vibration on the heat conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 This is a schematic structural diagram of a low-temperature waste heat recovery device and method based on a sulfuric acid chemical conversion section proposed by the present invention;

[0037] Figure 2 for Figure 1 Detailed schematic diagram of the structure of the phase change waste heat recovery component;

[0038] Figure 3 for Figure 2 Detailed diagram of the structure after removing the kettle shell and rotating it to a certain angle;

[0039] Figure 4 for Figure 2 Detailed diagram of the structure of the middle boost component after it is rotated to a certain angle;

[0040] Figure 5 for Figure 4 Detailed diagram of the enlarged structure of the center trim unit after removing the motor;

[0041] Figure 6 for Figure 5 Detailed schematic diagram of the structure after rotation at a certain angle;

[0042] Figure 7 for Figure 5 Detailed diagram of the structure after removing the automatic balancing component and rotating it to a certain angle;

[0043] Figure 8 for Figure 7 A detailed diagram of the enlarged structure of the middle balance plate and the counterweight assembly;

[0044] Figure 9 for Figure 8 Detailed schematic diagram of the exploded structure;

[0045] Figure 10 for Figure 9 An enlarged schematic diagram of the structure of the middle counterweight frame;

[0046] Figure 11 for Figure 9 Detailed schematic diagram of the structure of the middle adjustment mechanism;

[0047] Figure 12 for Figure 6 Detailed diagram of the structure of the automatic balancing component after it rotates to a certain angle;

[0048] Figure 13 for Figure 12 A detailed diagram of the enlarged structure after removing the outer cover, electric push rod, fixed frame, sliding frame and support column and rotating them to a certain angle;

[0049] Figure 14 for Figure 13 Detailed schematic diagram of the structure after rotation at a certain angle;

[0050] Figure 15 for Figure 13 Detailed schematic diagram of the structure after removing the pillar, first disc, second disc, battery block and current controller;

[0051] Figure 16 for Figure 13 A schematic diagram of the enlarged structure of one of the equilibrium structures;

[0052] Figure 17 The following is a detailed schematic diagram of the system flow of a waste heat low-temperature recovery device based on the sulfuric acid chemical conversion section.

[0053] In the figure: 1 conversion tower, 2 second absorption tower, 3 phase change waste heat recovery component, 4 low temperature superheater, 5 booster component, 6 evaporator, 7 preheating sleeve, 8 first outlet pipe, 9 first inlet pipe, 10 water inlet pipe, 11 steam outlet pipe, 12 second outlet pipe, 13 second inlet pipe, 14 heat exchange elbow, 15 booster bottle, 16 balancing unit, 17 vibration damping support, 18 balance plate, 19 booster, 20 automatic balancing component, 21 electric push rod, 22 counterweight component, 23 first flange, 24 second flange Lan, 25 counterweight block, 26 counterweight frame, 27 first gear cylinder, 28 screw, 29 second gear cylinder, 30 first gear disc, 31 second gear disc, 32 first permanent magnetic disc, 33 third gear disc, 34 second permanent magnetic disc, 35 first locking structure, 36 second locking structure, 37 fixed frame, 38 sliding frame, 39 support column, 40 outer cover, 41 electromagnetic block, 42 ​​first disc, 43 second disc, 44 battery block, 45 current controller, 46 pillar, 47 Hall sensor, 48 support ring. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] Example 1: Reference Figures 1-4 A low-temperature waste heat recovery device and method based on a sulfuric acid chemical conversion section includes a conversion tower 1, a secondary absorption tower 2, and a low-temperature superheater 4, and also includes a phase change waste heat recovery component 3 installed between the secondary absorption tower 2 and the low-temperature superheater 4;

[0056] The phase change waste heat recovery assembly 3 is composed of an evaporator 6 and an evaporation mechanism and a preheating mechanism installed on the evaporator 6. The preheating mechanism contains a balancing unit 16. The balancing unit 16 includes a vibration-damping support 17 fixedly mounted on the evaporator 6. A booster bottle 15 is fixedly mounted on the vibration-damping support 17. A booster 19 that cooperates with the booster bottle 15 is installed on the vibration-damping support 17. The booster 19 is used to increase the gas pressure in the booster bottle 15.

[0057] The conversion tower 1 is an existing equipment, which is divided into multiple layers. The sulfur trioxide flue gas at the fourth layer outlet enters the secondary absorption tower 2 after heat exchange in the low-temperature superheater 4. The temperature entering the secondary absorption tower 2 is 150-180°C. After reaction in the secondary absorption tower 2, the outlet temperature is 70-100°C, and then passes through the tail absorption tower and enters the exhaust pipe discharge system.

[0058] After the sulfur trioxide flue gas enters the secondary absorption tower 2 for reaction, the outlet temperature is 70-100°C. The reaction heat of the sulfur trioxide flue gas and concentrated sulfuric acid is carried to the circulating acid pump tank by the concentrated sulfuric acid. Since the above heat is not recovered, the temperature of the sulfuric acid is relatively high when it enters the circulating acid pump tank. The concentrated sulfuric acid in the circulating acid pump tank enters the drying tower acid cooler and the finished product acid cooler, which requires a large amount of circulating water to cool the sulfuric acid, thereby increasing the amount of circulating water and the power consumption of the circulating water system. If the temperature of the sulfur trioxide entering the secondary absorption tower 2 is reduced, it will not affect the absorption effect, but will help reduce the generation of acid mist and the evaporation of concentrated sulfuric acid (this part is the existing process flow and existing equipment, which is not mentioned here in detail). Therefore, it is necessary to install a phase change waste heat recovery component 3 between the secondary absorption tower 2 and the low-temperature superheater 4 to recycle the waste heat.

[0059] The evaporation mechanism includes a plurality of U-shaped heat exchange elbows 14 fixedly installed inside the evaporation kettle 6, two air guide plates are installed in the evaporation kettle 6 for guiding air, and two longitudinal partitions and a transverse partition are installed in the evaporation kettle 6. The two longitudinal partitions divide the evaporation kettle 6 into three chambers. The evaporation kettle 6 is connected to the low-temperature superheater 4 through a second air inlet pipe 13, and the second air inlet pipe 13 is connected to the second chamber of the evaporation kettle 6. The evaporation kettle 6 is fixedly connected with a water inlet pipe 10 and a steam outlet pipe 11. The transverse partition is located in the first chamber, dividing the first chamber into two upper and lower sub-cavities, the water inlet pipe 10 is connected to the lower sub-cavity, and the steam outlet pipe 11 is connected to the upper sub-cavity. The evaporation kettle 6 is connected to the second absorption tower 2 through a second air outlet pipe 12, and the second air outlet pipe 12 is connected to the third chamber of the evaporation kettle 6;

[0060] Water enters the lower sub-chamber of the evaporator 6 through the water inlet pipe 10, and then enters the upper sub-chamber of the evaporator 6 through the heat exchange elbow 14. When the water flows in the heat exchange elbow 14, the flue gas in the conversion tower 1 enters the second chamber of the evaporator 6 through the low-temperature superheater 4 and the second air inlet pipe 13, and flows from the second chamber to the top. Under the action of the guide plate, the flue gas flows in an S shape in the second chamber, thereby extending the contact time between the flue gas and the heat exchange elbow 14 and improving the heat conduction efficiency. After heat exchange in the heat exchange elbow 14, the water in the heat exchange elbow 14 absorbs heat from the flue gas, thereby evaporating the water in the heat exchange elbow 14. The evaporated steam enters the upper sub-chamber and is then discharged through the steam outlet pipe 11 for use in other processes of sulfuric acid production.

[0061] The water in the deaerator is 90-110℃ and is heated by SO3 flue gas to produce low-pressure saturated steam. The steam is then introduced into the compressor, consuming electricity to increase the temperature and pressure. Deoxygenated water is introduced at the outlet and becomes superheated steam of 0.2-0.3MPa.A and sent to the user end.

[0062] The preheating mechanism includes a preheating sleeve 7 fixedly mounted on the water inlet pipe 10, and the preheating sleeve 7 is fixedly connected to a first air outlet pipe 8 and a first air inlet pipe 9. The first air outlet pipe 8 is connected to the third cavity of the evaporator 6, and the first air inlet pipe 9 is connected to the second cavity of the evaporator 6. The booster bottle 15 and the booster 19 are located between the first air inlet pipe 9 and the evaporator 6. The gas in the first air inlet pipe 9 enters the booster bottle 15, is pressurized by the booster 19, and is then introduced into the preheating sleeve 7.

[0063] After the flue gas flowing in the second cavity is heat-absorbed, it is discharged from the first air inlet pipe 9 into the booster bottle 15, and then the booster 19 is started to boost the flue gas in the booster bottle 15. The pressurized flue gas enters the preheating sleeve 7 through the first air inlet pipe 9, preheats the water in the water inlet pipe 10, reduces the temperature difference, and accelerates the evaporation of water. The flue gas in the preheating sleeve 7 is heat-absorbed again and then discharged into the third cavity of the evaporator 6 through the first air outlet pipe 8. The flue gas in the third cavity of the evaporator 6 will enter the second absorption tower 2 through the air pipe. At this time, the flue gas entering the second absorption tower 2 has a low heat content.

[0064] The principle of gas pressurization and temperature increase utilizes the physical phenomenon that the temperature of a gas changes during pressure changes, especially during compression. Specifically, when the gas is pressurized, the collisions between its molecules increase due to compression, and the energy is expressed in the form of heat, thereby causing the temperature to rise.

[0065] Example 2: This example differs from the example 1 in that: Figure 3-Figure 14 The other end of the supercharger 19 is fixedly mounted with a balancing disc 18 via a first flange (23), and a counterweight assembly 22 that matches the balancing disc 18 is mounted on the balancing disc 18; the function of the balancing disc 18 is to improve the rotation stability of the supercharger 19 and reduce the amplitude of the supercharger 19 during operation.

[0066] The counterweight assembly 22 includes a counterweight frame 26 fixedly mounted on the balancing plate 18 via a second flange 24. A plurality of screws 28 are slidably mounted on the counterweight frame 26. A counterweight block 25 is fixedly mounted on each screw 28. The counterweight frame 26 is equipped with a plurality of adjustment mechanisms that cooperate with corresponding screws 28.

[0067] The essence of the counterweight is the centrifugal force, which is proportional to the mass of the counterweight 25, the centrifugal radius, and the square of the angular velocity of the centrifugal rotation. Therefore, under the premise of ensuring that the mass of the counterweight 25 and the angular velocity of rotation remain unchanged, increasing the centrifugal radius will also increase the counterweight effect.

[0068] In the initial state, the balancing disc 18 is uniform and the dynamic balance is stable. At this time, the numerous counterweights 25 form a circle. When the balancing disc 18 rotates, the centrifugal forces generated by the circular counterweights 25 cancel each other out, so the dynamic balance of the balancing disc 18 is not affected.

[0069] Once the supercharger 19 is used for a long time and the shaft is worn, the eccentric rotation of the shaft will drive the balancing disc 18 to rotate eccentrically, causing dynamic imbalance. A pressure sensor is installed on the supercharger 19 to sense the pressure direction of the balancing disc 18 on the supercharger 19 during eccentric rotation, so as to confirm the eccentric position. At this time, rotating the screw 28 will change the distance between the counterweight 25 and the center point of the balancing disc 18 under the action of the adjusting mechanism. At this time, the centrifugal radius increases, and the centrifugal force increases, which is used to compensate for the uneven part of the balancing disc 18.

[0070] The first flange 23 is composed of two flanges, one of which is rotatably mounted with a screw, and the other is fixedly mounted with a nut. Each screw is fixedly mounted with a gear, and the flange on which the screw is rotatably mounted is rotatably mounted with a gear ring that meshes with multiple gears.

[0071] When installing the balancing disc 18, it is necessary to rotate the screws on the first flange 23 symmetrically and alternately. Since there are multiple screws on the first flange 23, the installation operation is cumbersome and the displacement of each staggered rotation is difficult to control. This may cause some screws and nuts to be loose, resulting in eccentricity of the balancing disc 18. Therefore, the above-mentioned gear ring and gear are used to complete the docking of the first flange 23.

[0072] By rotating one of the lead screws, the lead screw will drive the gear fixed to it to rotate, thereby driving the gear ring meshing with it to rotate. The rotation of the gear ring drives the other gears to rotate, thereby driving multiple gears and lead screws to rotate synchronously, avoiding the situation of rotation error caused by staggered rotation. It is easy to operate, has high installation efficiency and high installation accuracy.

[0073] The adjustment mechanism includes a threaded sleeve rotatably mounted on the counterweight frame 26 and threadably connected to the screw 28, a first gear cylinder 27 is fixedly mounted on the threaded sleeve, a rotating shaft is rotatably mounted on the counterweight frame 26, and a second gear cylinder 29 meshing with the first gear cylinder 27 is fixedly mounted on the rotating shaft;

[0074] A first gear disc 30 is fixedly mounted on the rotating shaft, a shaft body 1 and a shaft body 2 are rotatably mounted on the counterweight frame 26, a third gear disc 33 meshing with the first gear disc 30 is fixedly mounted on the shaft body 1, a second gear disc 31 is fixedly mounted on the shaft body 2, a fourth gear disc meshing with both the second gear disc 31 and the first gear disc 30 is rotatably mounted on the counterweight frame 26, a second permanent magnetic disc 34 is fixedly mounted on the shaft body 1, a first permanent magnetic disc 32 is fixedly mounted on the shaft body 2, a second locking structure 36 cooperating with the first permanent magnetic disc 32 is mounted on the counterweight frame 26, and a first locking structure 35 cooperating with the second permanent magnetic disc 34 is mounted on the counterweight frame 26;

[0075] When the first permanent magnet disk 32 is locked by the second locking structure 36, the first permanent magnet disk 32 will not rotate, and the first locking structure 35 will not lock the second permanent magnet disk 34, so the second permanent magnet disk 34 will rotate. The rotation of the second permanent magnet disk 34 drives the third gear disk 33 to rotate, thereby driving the first gear disk 30 to rotate. The rotation of the first gear disk 30 drives the rotating shaft fixedly connected thereto to rotate. The rotating shaft drives the second gear cylinder 29 to rotate, thereby driving the first gear cylinder 27 to rotate. The rotation of the first gear cylinder 27 drives the threaded sleeve fixedly connected thereto to rotate. At this time, the rotation direction of the threaded sleeve is the same as the rotation direction of the second permanent magnet disk 34, thereby driving the screw 28 to move and changing the position of the counterweight 25.

[0076] When the first permanent magnet disk 32 is not locked by the second locking structure 36, the first permanent magnet disk 32 rotates, while the first locking structure 35 locks the second permanent magnet disk 34, so the second permanent magnet disk 34 does not rotate. The rotation of the first permanent magnet disk 32 drives the second gear disk 31 to rotate, thereby driving the fourth gear disk to rotate. The rotation of the fourth gear disk drives the first gear disk 30 to rotate. The rotation of the first gear disk 30 drives the rotating shaft fixedly connected thereto to rotate. The rotating shaft drives the second gear cylinder 29 to rotate, thereby driving the first gear cylinder 27 to rotate. The rotation of the first gear cylinder 27 drives the threaded sleeve fixedly connected thereto to rotate. At this time, the rotation direction of the threaded sleeve is opposite to the rotation direction of the first permanent magnet disk 32.

[0077] By cooperating with each other, the first locking structure 35 and the second locking structure 36 can be controlled to control the forward and reverse rotation of the screw 28, thereby expanding or reducing the distance between the counterweight block 25 and the center point of the balancing plate 18.

[0078] The first locking structure 35 and the second locking structure 36 are each composed of an elastic telescopic rod, a friction plate, and a permanent magnet. The two permanent magnets on the first locking structure 35 and the second locking structure 36 have opposite magnetic properties. The elastic telescopic rod is fixedly connected to the counterweight frame 26, the permanent magnet is fixedly connected to the telescopic end of the elastic telescopic rod, and the friction plate is fixedly connected to the permanent magnet. The two friction plates respectively cooperate with the corresponding first permanent magnetic disk 32 and second permanent magnetic disk 34.

[0079] When the magnetism of a magnet (corresponding to the lower electromagnetic block 41) is the same as that of the permanent magnet on the first locking structure 35, as the magnet moves, the permanent magnet on the first locking structure 35 will compress the elastic telescopic rod, preventing the friction plate from contacting the second permanent magnetic disk 34. At this time, the second permanent magnetic disk 34 can rotate.

[0080] Since the permanent magnet on the second locking structure 36 has opposite magnetic properties to the permanent magnet on the first locking structure 35, the movement of the magnet will drive the permanent magnet on the second locking structure 36 to move, thereby driving the elastic telescopic rod to extend, so that the friction plate on the elastic telescopic rod is against the first permanent magnetic disk 32, thereby locking the first permanent magnetic disk 32.

[0081] An automatic balancing assembly 20 that cooperates with a counterweight assembly 22 is mounted on the vibration-damping support 17 .

[0082] The automatic balancing assembly 20 includes a support column 46 mounted on the vibration-damping support 17 via a sliding structure. The support column 39 is fixedly mounted on the support column 46. The first disk 42 is fixedly mounted on the second disk 43. The second disk 43 is fixedly mounted on the support ring 48. The first disk 42 and the support ring 48 are mounted with multiple sets of balancing structures that cooperate with the corresponding first permanent magnetic disk 32, second permanent magnetic disk 34, and permanent magnets.

[0083] An outer cover 40 is fixedly mounted on the first disc 42 , and a cover body that matches the outer cover 40 is fixedly mounted on the vibration-damping support 17 . The outer cover 40 and the cover body are spliced ​​together to form a protective cover for preventing the balancing disc 18 from being covered, thereby improving safety.

[0084] The sliding structure includes a fixed frame 37 fixedly mounted on the vibration-damping support 17, a sliding frame 38 is slidably mounted on the vibration-damping support 17 via a slide rail, a support column 46 is fixedly connected to the sliding frame 38, and a support column 46 is slidably connected to the fixed frame 37, an electric push rod 21 is fixedly mounted on the fixed frame 37, a telescopic end of the electric push rod 21 is fixedly connected to the sliding frame 38, a support plate for supporting the electric push rod 21 is mounted on the vibration-damping support 17, a support column 39 is fixedly connected to the sliding frame 38, and a support column 39 is slidably connected to the fixed frame 37;

[0085] The electric push rod 21 drives the sliding frame 38 to move, so that the outer cover 40 is separated from the cover body. At this time, the balancing plate 18 is exposed and the balancing plate 18 can be disassembled or installed;

[0086] After the balancing disc 18 is installed, the driving end of the electric push rod 21 extends to merge the outer cover 40 with the cover body to form a protective cover. At this time, the balancing structure is close to the counterweight frame 26 but does not contact the counterweight frame 26.

[0087] The balancing structure includes a Hall sensor 47 fixedly mounted between the second disk 43 and the support ring 48. A current controller 45 and a battery block 44 are fixedly mounted on the first disk 42. An electromagnetic block 41 is fixedly mounted on the support ring 48 and cooperates with the corresponding first and second permanent magnetic disks 32, 34, and permanent magnets. The battery block 44, current controller 45, and electromagnetic block 41 form a closed loop circuit via wires.

[0088] During the rotation of the balancing disc 18, due to the high-speed rotation, friction with the air will be generated, and the rotation will drive the air flow, which will cause a large amount of dust to be adsorbed on the balancing disc 18, causing the balancing disc 18 to be unbalanced. Therefore, it is necessary to perform dynamic balancing adjustment during the rotation of the balancing disc 18. The specific adjustment operation is as follows:

[0089] When the balancing disk 18 becomes eccentric due to dust adhesion or the shaft becomes eccentric due to long-term wear, the pressure sensor will transmit a signal to the Hall sensor 47. Each Hall sensor 47 is matched with the corresponding first permanent magnet disk 32 and second permanent magnet disk 34. When the corresponding first permanent magnet disk 32 and second permanent magnet disk 34 pass the Hall sensor 47, the corresponding electromagnetic block 41 is energized and the current direction in the electromagnetic block 41 is controlled by the current controller 45. Different current directions result in different magnetic properties of the electromagnetic block 41. The change in magnetic properties drives the permanent magnet on the first locking structure 35 or the second locking structure 36 to move, achieving locking. At the same time, the electromagnetic block 41 is fixed, while the first permanent magnet disk 32 and the second permanent magnet disk 34 perform circular motion around the balancing disk 18. The first permanent magnet disk 32 and the second permanent magnet disk 34 intermittently pass the corresponding electromagnetic block 41. The angle of each rotation of the first permanent magnet disk 32 or the second permanent magnet disk 34 is related to the duration of power supply of the electromagnetic block 41. The longer the power supply duration, the larger the single rotation angle and the lower the adjustment accuracy.

[0090] Reference Process Figure 17 , the specific operating steps of this device are as follows:

[0091] In the raw sulfuric acid industrial conversion section system, the SO3 flue gas at the fourth layer outlet of the conversion tower 1 enters the secondary absorption tower 2 after heat exchange in the low-temperature superheater 4. The temperature entering the secondary absorption tower 2 is 150-180°C. After reaction in the secondary absorption tower 2, the outlet temperature is 70-100°C. Then, after passing through the tail absorption tower, it enters the tail gas exhaust pipe and is discharged into the system.

[0092] After the SO3 flue gas enters the secondary absorption tower 2 for reaction, the outlet temperature is 70-100°C. The reaction heat of the SO3 flue gas and concentrated sulfuric acid is carried by the concentrated sulfuric acid to the circulating acid pump tank. Since the above heat is not recovered, the temperature of the sulfuric acid is relatively high when it enters the circulating acid pump tank. The concentrated sulfuric acid in the circulating acid pump tank enters the drying tower acid cooler and the finished product acid cooler, which requires a large amount of circulating water to cool the sulfuric acid, thereby increasing the amount of circulating water and the power consumption of the circulating water system.

[0093] At this time, an evaporation mechanism in the phase change waste heat recovery component 3 is set between the low-temperature superheater 4 and the secondary absorption tower 2 to heat and evaporate the deoxygenated water in the evaporator 6, and remove the excess heat in the SO3 flue gas. The SO3 flue gas cooled by the phase change waste heat recovery component 3 then enters the secondary absorption tower 2 for reaction, and finally enters the tail suction system with a lower exhaust temperature.

[0094] During the waste heat recovery process, a preheating mechanism is also set up to preheat the deoxygenated water to accelerate the evaporation of the deoxygenated water. At the same time, a booster bottle is set up to increase the pressure of SO3 and increase the temperature of SO3, so as to recover the waste heat more thoroughly.

[0095] Water enters the lower sub-chamber of the evaporator 6 through the water inlet pipe 10, and then enters the upper sub-chamber of the evaporator 6 through the heat exchange elbow 14. When the water flows in the heat exchange elbow 14, the flue gas in the conversion tower 1 enters the second chamber of the evaporator 6 through the low-temperature superheater 4 and the second air inlet pipe 13, and then flows upward from the second chamber. Under the action of the guide plate, the flue gas flows in an S-shaped manner in the second chamber, thereby extending the contact time between the flue gas and the heat exchange elbow 14 and improving the heat transfer efficiency. After heat exchange in the heat exchange elbow 14, the water in the heat exchange elbow 14 absorbs the heat in the flue gas, thereby evaporating the water in the heat exchange elbow 14. The evaporated steam enters the upper sub-chamber and is then discharged through the steam outlet pipe 11 for use in other processes of sulfuric acid production.

[0096] After the flue gas flowing in the second cavity absorbs heat, it is discharged from the first air inlet pipe 9 and discharged into the booster bottle 15. Then, the booster 19 is started to boost the flue gas in the booster bottle 15. The boosted flue gas enters the preheating sleeve 7 through the first air inlet pipe 9, preheating the water in the water inlet pipe 10, reducing the temperature difference and accelerating the evaporation of the water. The flue gas in the preheating sleeve 7 absorbs heat again and is then discharged into the third cavity of the evaporator 6 through the first air outlet pipe 8. The flue gas in the third cavity of the evaporator 6 enters the second absorption tower 2 through the air pipe. At this time, the flue gas entering the second absorption tower 2 has a low calorie content.

[0097] During the rotation of the balancing disk 18, dust may adhere to the balancing disk 18, causing dynamic imbalance. At this time, the pressure sensor will transmit a signal to the Hall sensor 47. When the corresponding first permanent magnet disk 32 and second permanent magnet disk 34 pass the Hall sensor 47, the corresponding electromagnetic block 41 will be energized. The current controller 45 controls the current direction and energization duration of the electromagnetic block 41. The first permanent magnet disk 32 and the second permanent magnet disk 34 will perform circular motion around the balancing disk 18, so the electromagnetic block 41 will rotate relative to the first permanent magnet disk 32 and the second permanent magnet disk 34.

[0098] When the magnetism of an electromagnetic block 41 is the same as that of the permanent magnet on the first locking structure 35, as the permanent magnet rotates, the permanent magnet on the first locking structure 35 will compress the elastic telescopic rod, and the friction plate will not be against the second permanent magnetic disk 34. At this time, the second permanent magnetic disk 34 rotates around the shaft under the suction or repulsion of the electromagnetic block 41. The rotation of the second permanent magnetic disk 34 drives the third gear disk 33 to rotate, thereby driving the first gear disk 30 to rotate. The rotation of the first gear disk 30 drives the rotating shaft fixedly connected thereto to rotate. The rotating shaft drives the second gear cylinder 29 to rotate, thereby driving the first gear cylinder 27 to rotate. The rotation of the first gear cylinder 27 drives the threaded sleeve fixedly connected thereto to rotate. At this time, the rotation direction of the threaded sleeve is the same as the rotation direction of the second permanent magnetic disk 34, thereby driving the screw 28 to move and changing the position of the counterweight 25.

[0099] If the position of the counterweight 25 needs to be retracted, the current direction is changed, and the magnetic pole of the electromagnetic block 41 changes. At this time, when the first permanent magnetic disk 32 is not locked by the second locking structure 36, the first permanent magnetic disk 32 will rotate, and the first locking structure 35 locks the second permanent magnetic disk 34, so the second permanent magnetic disk 34 will not rotate. The rotation of the first permanent magnetic disk 32 drives the second gear disk 31 to rotate, thereby driving the fourth gear disk to rotate. The rotation of the fourth gear disk drives the first gear disk 30 to rotate. The rotation of the first gear disk 30 drives the rotating shaft fixedly connected thereto to rotate. The rotating shaft drives the second gear cylinder 29 to rotate, thereby driving the first gear cylinder 27 to rotate. The rotation of the first gear cylinder 27 drives the threaded sleeve fixedly connected thereto to rotate. At this time, the rotation direction of the threaded sleeve is opposite to the rotation direction of the first permanent magnetic disk 32.

[0100] 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 low-temperature waste heat recovery device based on a sulfuric acid chemical conversion section, comprising a conversion tower (1), a secondary absorption tower (2), a deaerator, a low-temperature superheater (4) and a compressor, characterized in that: It also includes a phase change waste heat recovery component (3) installed between the second absorption tower (2) and the low-temperature superheater (4); The phase change waste heat recovery component (3) is arranged between the second absorption tower (2) and the low-temperature superheater (4), and is used to recover the heat in the sulfur trioxide at 150-180°C flowing out of the low-temperature superheater (4), and reduce the temperature of the sulfur trioxide after entering the second absorption tower (2) to 100-130°C. The phase change waste heat recovery component (3) consists of an evaporator (6) and an evaporation mechanism and a preheating mechanism installed on the evaporator (6). The evaporation mechanism evaporates the deoxygenated water to form steam for use in other sulfuric acid chemical conversion processes. The water in the deoxygenator is 90-110°C and is heated by the SO3 flue gas to generate low-pressure saturated steam. The steam is then introduced into a compressor, which consumes electrical energy to increase the temperature and pressure. The deoxygenated water is introduced at the outlet to become superheated steam of 0.2-0.3MPa.A and is sent to the user end. The preheating mechanism includes a balancing unit (16) therein, the balancing unit (16) including a vibration-damping support (17) fixedly mounted on the evaporating kettle (6), a booster bottle (15) fixedly mounted on the vibration-damping support (17), a supercharger (19) matched with the supercharger bottle (15) mounted on the vibration-damping support (17), a balancing plate (18) fixedly mounted on the other end of the supercharger (19) through a first flange (23), a counterweight assembly (22) matched with the balancing plate (18) mounted on the balancing plate (18), and an automatic balancing assembly (20) matched with the counterweight assembly (22) mounted on the vibration-damping support (17).

2. The waste heat low temperature recovery device based on the sulfuric acid chemical conversion section according to claim 1 is characterized in that: The evaporation mechanism comprises a plurality of U-shaped heat exchange elbows (14) fixedly mounted inside the evaporation kettle (6); two air guide plates are mounted inside the evaporation kettle (6) for guiding air; two longitudinal partitions and a transverse partition are mounted inside the evaporation kettle (6); the two longitudinal partitions divide the evaporation kettle (6) into three cavities; the evaporation kettle (6) is connected to the low-temperature superheater (4) via a second air inlet pipe (13); the second air inlet pipe (13) is connected to the second cavity of the evaporation kettle (6); a water inlet pipe (10) and a steam outlet pipe (11) are fixedly connected to the evaporation kettle (6); the transverse partition is located in the first cavity and divides the first cavity into two upper and lower sub-cavities; the water inlet pipe (10) is connected to the lower sub-cavity; the steam outlet pipe (11) is connected to the upper sub-cavity; the evaporation kettle (6) is connected to the second absorption tower (2) via a second air outlet pipe (12); the second air outlet pipe (12) is connected to the third cavity of the evaporation kettle (6); The preheating mechanism comprises a preheating sleeve (7) fixedly sleeved on a water inlet pipe (10); a first air outlet pipe (8) and a first air inlet pipe (9) are fixedly connected to the preheating sleeve (7); the first air outlet pipe (8) is connected to a third cavity of the evaporating kettle (6); the first air inlet pipe (9) is connected to a second cavity of the evaporating kettle (6); a pressurizing bottle (15) and a supercharger (19) are located between the first air inlet pipe (9) and the evaporating kettle (6); the gas in the first air inlet pipe (9) enters the pressurizing bottle (15), is pressurized by the supercharger (19), and is then introduced into the preheating sleeve (7).

3. The waste heat low temperature recovery device based on the sulfuric acid chemical conversion section according to claim 1 is characterized in that: The counterweight assembly (22) includes a counterweight frame (26) fixedly mounted on the balancing plate (18) via a second flange (24), a plurality of screws (28) being slidably mounted on the counterweight frame (26), a counterweight block (25) being fixedly mounted on each of the screws (28), and a plurality of adjustment mechanisms cooperating with corresponding screws (28) being mounted on the counterweight frame (26); The adjusting mechanism comprises a threaded sleeve rotatably mounted on a counterweight frame (26) and threadably connected to a screw rod (28); a first gear cylinder (27) is fixedly mounted on the threaded sleeve; a rotating shaft is rotatably mounted on the counterweight frame (26); a second gear cylinder (29) meshing with the first gear cylinder (27) is fixedly mounted on the rotating shaft; A first toothed disc (30) is fixedly mounted on the rotating shaft, a shaft body 1 and a shaft body 2 are rotatably mounted on the counterweight frame (26), a third toothed disc (33) meshing with the first toothed disc (30) is fixedly mounted on the shaft body 1, a second toothed disc (31) is fixedly mounted on the shaft body 2, a fourth toothed disc meshing with both the second toothed disc (31) and the first toothed disc (30) is rotatably mounted on the counterweight frame (26), a second permanent magnetic disc (34) is fixedly mounted on the shaft body 1, a first permanent magnetic disc (32) is fixedly mounted on the shaft body 2, a second locking structure (36) matching with the first permanent magnetic disc (32) is mounted on the counterweight frame (26), and a first locking structure (35) matching with the second permanent magnetic disc (34) is mounted on the counterweight frame (26).

4. The waste heat low temperature recovery device based on the sulfuric acid chemical conversion section according to claim 3 is characterized in that: The first locking structure (35) and the second locking structure (36) are both composed of an elastic telescopic rod, a friction plate and a permanent magnet, and the two permanent magnets on the first locking structure (35) and the second locking structure (36) have opposite magnetic properties, the elastic telescopic rod is fixedly connected to the counterweight frame (26), the permanent magnet is fixedly connected to the telescopic end of the elastic telescopic rod, and the friction plate is fixedly connected to the permanent magnet, and the two friction plates are respectively matched with the corresponding first permanent magnetic disk (32) and second permanent magnetic disk (34).

5. The waste heat low temperature recovery device based on the sulfuric acid chemical conversion section according to claim 4 is characterized in that: The automatic balancing assembly (20) includes a pillar (46) mounted on a vibration-damping support (17) via a sliding structure, a first disc (42) being fixedly mounted on the pillar (46), a second disc (43) being fixedly mounted on the first disc (42), a support ring (48) being fixedly mounted on the second disc (43), and a plurality of balancing structures that cooperate with corresponding first permanent magnetic discs (32), second permanent magnetic discs (34) and permanent magnets being mounted on the first disc (42) and the support ring (48).

6. The waste heat low temperature recovery device based on the sulfuric acid chemical conversion section according to claim 5 is characterized in that: The sliding structure includes a fixed frame (37) fixedly mounted on a vibration-damping support (17), a sliding frame (38) being slidably mounted on the vibration-damping support (17) via a slide rail, a fixed connection between the support (46) and the sliding frame (38), and a sliding connection between the support (46) and the fixed frame (37), an electric push rod (21) being fixedly mounted on the fixed frame (37), a fixed connection between the telescopic end of the electric push rod (21) and the sliding frame (38), and a support plate for supporting the electric push rod (21) being mounted on the vibration-damping support (17).

7. The waste heat low temperature recovery device based on the sulfuric acid chemical conversion section according to claim 5 is characterized in that: The balancing structure comprises a Hall sensor (47) fixedly mounted between a second disk (43) and a support ring (48); a current controller (45) and a battery block (44) are fixedly mounted on the first disk (42); an electromagnetic block (41) matched with a corresponding first permanent magnetic disk (32), a second permanent magnetic disk (34) and a permanent magnet is fixedly mounted on the support ring (48); the battery block (44), the current controller (45) and the electromagnetic block (41) form a closed loop circuit via a wire.

8. The waste heat low temperature recovery device based on the sulfuric acid chemical conversion section according to claim 3 is characterized in that: The first flange (23) is composed of two flange plates, one of which is rotatably mounted with a screw rod, and the other is fixedly mounted with a nut, each screw rod is fixedly mounted with a gear, and the flange plate on which the screw rod is rotatably mounted is rotatably mounted with a gear ring meshed with multiple gears.

9. The low-temperature waste heat recovery device based on the sulfuric acid chemical conversion section according to claim 7, characterized in that: An outer cover (40) is fixedly mounted on the first disc (42), a cover body matching the outer cover (40) is fixedly mounted on the vibration-damping support (17), and the outer cover (40) and the cover body are spliced ​​together to form a protective cover.

10. A low-temperature waste heat recovery method based on a sulfuric acid chemical conversion section, used in a low-temperature waste heat recovery device based on a sulfuric acid chemical conversion section according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, the original sulfuric acid industrial conversion section system, the SO3 flue gas at the fourth layer outlet of the conversion tower (1) enters the secondary absorption tower (2) after heat exchange in the low-temperature superheater (4), and the temperature entering the secondary absorption tower (2) is 150-180°C. After reaction in the secondary absorption tower (2), the outlet temperature is 70-100°C, and then passes through the tail absorption tower and enters the tail gas exhaust pipe discharge system. After the S2 and SO3 flue gases enter the secondary absorption tower (2) for reaction, the outlet temperature is 70-100°C. The reaction heat of the SO3 flue gases and the concentrated sulfuric acid is carried by the concentrated sulfuric acid to the circulating acid pump tank. Since the heat is not recovered, the temperature of the sulfuric acid is relatively high when it enters the circulating acid pump tank. The concentrated sulfuric acid in the circulating acid pump tank enters the drying tower acid cooler and the finished product acid cooler, which requires a large amount of circulating water to cool the sulfuric acid, thereby increasing the amount of circulating water and the power consumption of the circulating water system. S3. At this time, an evaporation mechanism in the phase change waste heat recovery component (3) is set between the low-temperature superheater (4) and the second absorption tower (2) to heat and evaporate the deoxygenated water in the evaporator (6) to remove excess heat from the SO3 flue gas. The SO3 flue gas cooled by the phase change waste heat recovery component (3) then enters the second absorption tower (2) for reaction and finally enters the tail suction system at a lower exhaust temperature. During the waste heat recovery process, a preheating mechanism is also set up to preheat the deoxygenated water to accelerate the evaporation of the deoxygenated water. At the same time, a booster bottle is set up to increase the pressure of SO3 and increase the temperature of SO3, so as to recover the waste heat more thoroughly.

Images