A device for treating VOCs in a sulphuric acid drying system

Abstract

This utility model discloses a VOCs treatment device for an ammonium sulfate drying system, belonging to the field of waste gas treatment technology. It includes a vibrating fluidized bed dryer, a feeding and conveying assembly, and a waste gas treatment assembly. The air inlet of the vibrating fluidized bed dryer is connected to the hot air input via a stainless steel flexible metal hose and a high-temperature resistant silicone rubber sealing gasket. The air outlet of the vibrating fluidized bed dryer is connected to the pipe interface of the waste gas treatment assembly via a stainless steel flexible metal hose and a high-temperature resistant silicone rubber sealing gasket. The vibrating fluidized bed dryer and the feeding and conveying assembly are connected by a metal corrugated pipe and a graphite spiral wound gasket in a hard seal. This utility model achieves efficient VOCs treatment and environmental compliance in the ammonium sulfate drying system through equipment modification, closed-loop waste gas collection, and multi-stage washing and adsorption processes. The improved sealing structure avoids leakage caused by loose bolts and reduces maintenance frequency. The detachable design supports partial replacement without disassembling the entire conveying or centrifugal equipment, reducing operation and maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a VOCs treatment device for an ammonium sulfate drying system. Background Technology

[0002] Ammonium sulfate is an important byproduct of the coking industry, mainly produced through the ammonium sulfate process (absorption deammoniation). The ammonium sulfate drying system is the core unit of the ammonium sulfate production line in coking enterprises. Its function is to dry wet ammonium sulfate crystals (containing approximately 5%~10% moisture) with hot air to a qualified product with a moisture content of ≤1%. However, during the drying process, the ammonium sulfate crystals release volatile organic compounds (VOCs) due to heating. Simultaneously, ammonium sulfate dust, unreacted organic sulfur compounds (such as thiols and carbon disulfide), phenols, and small amounts of benzene compounds carried by the circulating hot air in the system combine to form a high-humidity (relative humidity ≥80%), medium-high temperature (80~120℃), complex low-concentration VOCs waste gas (VOCs concentration typically 50~500 mg / m³). 3 Some components (such as benzo[a]pyrene) are carcinogenic.

[0003] Currently, ammonium sulfate drying systems in the industry generally suffer from two major technical defects: low efficiency of uncontrolled waste gas collection and large exhaust gas volume with high material carrying capacity. The specific manifestations and impacts are as follows.

[0004] 1. Unorganized waste gas was not effectively sealed and collected, resulting in widespread dispersion of ammonium sulfate particles indoors.

[0005] During the drying process of ammonium sulfate, the wet ammonium sulfate crystals decompose upon heating, releasing volatile organic compounds (VOCs). Simultaneously, material conveying, crushing, and internal stirring within the dryer generate a large amount of ammonium sulfate dust (particles with a diameter ≤10μm account for ≥60%). If the collection system's sealing design is inadequate, the following problems may occur.

[0006] ① The equipment interface is not properly sealed, causing uncontrolled leakage of exhaust gas. Ammonium sulfate drying systems typically consist of a vibrating fluidized bed dryer, inlet, outlet, hot air ducts, and dust removal equipment. If the sealing structure at each interface is inadequate, it can lead to: high-temperature exhaust gas (80-120℃) carrying ammonium sulfate dust leaking out of the interface gaps and spreading into the workshop; and an increase in the indoor concentration of ammonium sulfate particles (measured to 50-100 mg / m³). 3 Ammonium sulfate adheres to the surface of equipment, electrical circuits, and operating platforms, causing equipment corrosion (the corrosion rate increases by 2 to 3 times after absorbing moisture) and an increased risk of electrical short circuits (particle conductivity causes malfunctions).

[0007] ② The design of the fume hood and the wind speed control failed, resulting in severe particle diffusion. Existing systems mostly use top-suction hoods to collect drying exhaust gas, but they have the following drawbacks: the size of the hood opening does not match the cross-section of the dryer (the opening area is too small or the position is off), resulting in low exhaust gas capture efficiency (only 60%~70%), and the uncaptured exhaust gas carries particles directly into the workshop; the wind speed design of the hood is unreasonable (when the wind speed is <0.5m / s, particles are easy to settle due to gravity; when the wind speed is >2m / s, it is easy to carry a large amount of air, resulting in increased energy consumption), and the wind speed fluctuates greatly in actual operation (0.3~1.5m / s), and the particle diffusion range expands (ammonium sulfate particles settle in an area of ​​5~10 meters in the workshop).

[0008] Second, the exhaust gas volume is large and carries a large amount of material, making it a heavy burden to meet emission standards in the future.

[0009] The tail gas of the ammonium sulfate drying system (drying exhaust gas + dust removal exhaust gas) is characterized by large air volume, high material carrying capacity and complex composition, which brings the following challenges to subsequent treatment.

[0010] ① Excessive air volume, causing the treatment equipment to exceed its design load. To maintain efficient hot air circulation (the hot air flow rate is typically 5 to 8 times the dryer's processing capacity), the exhaust gas volume in drying systems is generally large (e.g., for an ammonium sulfate drying system with a processing capacity of 20 t / h, the exhaust gas volume can reach 20,000 to 30,000 m³ / h). 3 / h). Existing exhaust gas treatment equipment (such as bag filters and activated carbon adsorption towers) are mostly designed for air volumes of 15,000~20,000 m³ / h. 3 The air volume is configured as / h, but in actual operation, it exceeds the design value by 10% to 30%.

[0011] ② High material carrying capacity leads to severe equipment blockage and wear. During the drying process, dust (particle size ≤10μm) generated from the crushing of ammonium sulfate crystals (crushing rate ≥15%) and incompletely dried ammonium sulfate particles (moisture content 2%~5%) are discharged with the exhaust gas, resulting in a dust concentration in the exhaust gas as high as 100~500mg / m³. 3 (far exceeding the 30 mg / m³ requirement of the Integrated Emission Standard for Air Pollutants GB16297-1996) 3 High concentrations of dust can lead to: rapid dust accumulation inside the water-based dust collector (dust thickness ≥ 5 mm / week), increased equipment resistance, fan current overload, and risk of motor burnout; dust deposition in pipes and bends (deposition rate ≥ 2 mm / month), resulting in a reduction in pipe cross-sectional area (ventilation volume decreases by 10%~15%), requiring frequent manual cleaning (1~2 times per month), and increasing operation and maintenance costs.

[0012] ③ The composition is complex, and the subsequent processing technology is poorly adapted. In addition to ammonium sulfate dust, the tail gas from ammonium sulfate drying also carries volatile organic compounds (VOCs, concentration 50~500 mg / m³).3 ), acidic gases (H2S, SO2, concentration 10~100mg / m³) 3 And small amounts of benzene compounds (such as benzo[a]pyrene, concentration 0.1~1 μg / m³). 3 Existing treatment processes (such as "bag filter + activated carbon adsorption") have high dust removal efficiency (≥99%), but their ability to synergistically remove VOCs, acid gases and characteristic pollutants (benzo[a]pyrene) is insufficient. Utility Model Content

[0013] The purpose of this invention is to solve the problems of fugitive exhaust gas leakage, large exhaust gas volume and high material carrying capacity, and difficulty in removing VOCs and characteristic pollutants in the existing ammonium drying system, and to propose a VOCs treatment device for the ammonium sulfate drying system.

[0014] To achieve the above objectives, the present invention adopts the following technical solution: A VOCs treatment device for an ammonium sulfate drying system includes: a vibrating fluidized bed dryer, a feeding and conveying assembly, and an exhaust gas treatment assembly. The vibrating fluidized bed dryer's air inlet is connected to a hot air input via a stainless steel flexible metal hose and a high-temperature resistant silicone rubber gasket; the vibrating fluidized bed dryer's air outlet is connected to the exhaust gas treatment assembly's pipe interface via a stainless steel flexible metal hose and a high-temperature resistant silicone rubber gasket; and the vibrating fluidized bed dryer and the feeding and conveying assembly are connected by a metal corrugated pipe and a graphite spiral wound gasket in a hard seal. The exhaust gas treatment assembly consists of a primary cyclone dust collector and a secondary water bath dust collector.

[0015] In some embodiments, the upper and lower parts of the vibrating fluidized bed dryer are flexibly connected by a rubber retaining ring.

[0016] In some embodiments, the upper part of the vibrating fluidized bed dryer is suspended by support columns provided on the outer side.

[0017] In some embodiments, the lower end of the vibrating fluidized bed dryer is supported by a base through airbag shock absorption and dampers.

[0018] In some embodiments, the airbag damper is an annular airbag, and the damper is installed inside the airbag damper.

[0019] In some embodiments, it further includes: a damping adjustment component; The damping adjustment assembly includes: an internally threaded cylinder fixed on the support base, and a pressure body assembled inside the internally threaded cylinder.

[0020] In some embodiments, the inner wall of the vibrating fluidized bed dryer is provided with a wear-resistant ceramic plate with a thickness of not less than millimeters.

[0021] In some embodiments, the flange interface of the cyclone dust collector is equipped with a graphite spiral wound gasket; the cyclone dust collector uses a centrifugal induced draft fan, 28000m³ / h. 3 / h, wind pressure 2000Pa.

[0022] In some embodiments, flange rings are provided at both ends of the metal bellows, and a guide rod is assembled between the flange rings, with a spring fitted on the guide rod; under normal conditions, the spring presses against the two flange rings to expand the metal bellows to a non-maximum length.

[0023] In some embodiments, the water bath dust collector is a scrubbing tower; The washing tower is equipped with a layer of wire mesh packing and a spiral water distribution pipe at intervals.

[0024] Compared with the prior art, the present invention provides a VOCs treatment device for an ammonium sulfate drying system, which has the following beneficial effects.

[0025] 1. This utility model achieves efficient treatment of VOCs and environmental compliance in the ammonium sulfate drying system through equipment modification, closed collection of waste gas, and multi-stage washing and adsorption processes.

[0026] 2. The improved sealing structure of this utility model avoids leakage caused by loose bolts and reduces maintenance frequency; the detachable design supports partial replacement without disassembling the entire conveying or centrifugal equipment, reducing operation and maintenance costs; the modular connecting parts can be quickly disassembled and replaced; the base is supported by airbag shock absorption and dampers, reducing the sealing failure caused by vibration transmission.

[0027] 3. This utility model consists of a two-stage equipment, namely a primary cyclone dust collector and a secondary water bath dust collector, which work together to achieve efficient removal of VOCs and characteristic pollutants; it reduces the footprint and increases the purification efficiency; it adopts a centrifugal induced draft fan to ensure stable collected air volume; it uses spiral-arranged nozzles to improve the uniformity of washing liquid distribution; and it uses a wire mesh packing layer to increase the gas-liquid contact area.

[0028] 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 upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the inlet side structure of a vibrating fluidized bed dryer.

[0030] Figure 2 for Figure 1 A magnified structural diagram of point A in the middle.

[0031] Figure 3 This is a schematic diagram of the outlet side structure of a vibrating fluidized bed dryer.

[0032] Figure 4 for Figure 3 A magnified structural diagram at point B in the middle.

[0033] Figure 5 This is a schematic diagram of the explosion state of this utility model.

[0034] Figure 6 This is a front view of the exploded state of this utility model.

[0035] Figure 7 This is a structural diagram of the supporting column.

[0036] Figure 8 This is a schematic diagram showing the usage status of a metal bellows.

[0037] Figure 9 This is a schematic diagram of the separated state of a metal bellows.

[0038] Figure 10 This is a schematic diagram of a metal bellows.

[0039] Figure 11 This is a structural diagram of the base support section.

[0040] Figure 12 This is a partial cross-sectional structural diagram of the base support section.

[0041] Figure 13 This is a partial cross-sectional view showing the separation of the pressure body and the dome cap.

[0042] Figure 14 This is a schematic diagram of the internal structure of a scrubbing tower.

[0043] Figure 15 This is a schematic diagram of the spiral water distribution pipe.

[0044] In the picture: 1. Vibrating fluidized bed dryer; 11. Support column; 12. Support foot; 2. Waste gas treatment assembly; 3. Stainless steel metal hose; 4. Metal corrugated pipe; 41. Guide rod; 42. Spring; 5. Rubber retaining ring; 6. Airbag shock absorber; 7. Damper; 71. Internal threaded cylinder; 72. Lower pressure body; 73. Dome cap; 74. Circular groove; 8. Scrubber; 81. Wire mesh packing layer; 82. Spiral water distribution pipe. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0046] Reference Figure 1-15 A VOCs treatment device for an ammonium sulfate drying system is proposed. Based on the core concept of "sealed collection, high-efficiency separation, and synergistic purification", it achieves efficient treatment and environmental compliance of VOCs in the ammonium sulfate drying system through equipment modification, sealed collection of waste gas, and multi-stage washing and adsorption processes.

[0047] The device includes: a vibrating fluidized bed dryer 1, a feeding conveying assembly, and an exhaust gas treatment assembly 2.

[0048] The air inlet of the vibrating fluidized bed dryer 1 is connected to the hot air input through a stainless steel metal flexible hose 3 and a high-temperature resistant silicone rubber sealing gasket, ensuring that the interface gap is ≤1mm (the gap of the traditional structure is ≥5mm); the air outlet of the vibrating fluidized bed dryer 1 is connected to the pipe interface of the exhaust gas treatment component 2 through a stainless steel metal flexible hose 3 and a high-temperature resistant silicone rubber sealing gasket (the pipe of the exhaust gas treatment component 2 is suspended at the top, and the pipe interface is vertically downward, so as not to exert pressure on the vibrating fluidized bed dryer 1).

[0049] The inlet of the vibrating fluidized bed dryer 1 is connected to the outlet of the feed conveying assembly by a metal bellows 4 and a graphite spiral wound gasket in a hard seal. The sections of the feed conveying assembly are also connected by graphite spiral wound gaskets in a hard seal (the metal bellows 4 can be optionally installed for easy removal of individual sections). Additionally, the outlet of the vibrating fluidized bed dryer 1 is also connected to the output conveying assembly by a metal bellows 4 and a graphite spiral wound gasket in a hard seal.

[0050] In this solution, the improved sealing structure avoids leakage caused by loose bolts (leakage rate ≤2%); at the same time, the graphite spiral wound gasket is resistant to aging (life ≥1 year), reducing maintenance frequency; the detachable design supports partial replacement (such as replacing only the sealing gasket) without disassembling the entire conveying or centrifugal equipment, reducing annual maintenance time by nearly 50% and lowering operation and maintenance costs; in addition, the metal bellows 4 can compensate for the thermal expansion and contraction of the equipment (compensation amount ≥50mm), avoiding interface stress cracking caused by temperature changes.

[0051] Understandably, traditional vibrating fluidized beds use rigid connections (bolted fixing). Due to issues such as thermal expansion and contraction, vibration fatigue, and other problems, gaps (≥5mm) are easily generated at the dryer's inlet, outlet, and air outlet. This leads to the unorganized escape of high-temperature exhaust gas (80~120℃) carrying ammonium sulfate particles, resulting in ammonium sulfate dust concentrations as high as 50-100mg / m³ within the workshop. 3 This seriously affects worker health and environmental compliance.

[0052] In this solution, high-temperature resistant silicone rubber sealing gaskets, stainless steel metal hoses, metal corrugated pipes 4, and graphite spiral wound gaskets are used for connection, with interface gaps ≤1mm (compared to gaps ≥5mm in traditional structures); moreover, the connecting components are modular and can be quickly disassembled and replaced (replacement time ≤30 minutes, compared to 2-4 hours for traditional structures).

[0053] In addition, the lower end of the vibrating fluidized bed dryer 1 is supported by an airbag shock absorber 6 and a damper 7; for example, one set is set at each of the four corners, for a total of four sets; preferably, the damping coefficient of the damper 7 is 500 N·s / m; it can reduce the vibration amplitude of the equipment from 5 mm / s to below 1 mm / s, reducing the sealing failure caused by vibration transmission.

[0054] After the modification, the amount of fugitive exhaust gas leakage at the interface of the vibrating fluidized bed dryer 1 was reduced by 90% (the measured concentration of ammonium sulfate particles in the workshop decreased from 80 mg / m³). 3 Reduced to 8 mg / m 3 The equipment vibration noise was reduced from 90dB(A) to 70dB(A), and the problem of ammonium sulfate particles scattering was basically eliminated.

[0055] In this invention, the novel vibrating fluidized bed flexible connection design completely eliminates the escape of fugitive exhaust gas and dust; the flexible connection and detachable replacement structure reduce the interface gap by 90% and the internal exhaust gas leakage of the dryer by 90%; the flexible connection components can be replaced individually without disassembling the entire fluidized bed, reducing maintenance time by 80% and operation and maintenance costs by 60%; it absorbs vibration energy (reducing the vibration amplitude from 5mm / s to below 1mm / s), reducing the risk of fatigue fracture at the interface due to vibration, and extending the equipment life by 3-5 years.

[0056] In some embodiments, the material selection for the vibrating fluidized bed dryer 1 is as follows: the fluidized bed surface, the upper cover, the inner side plate of the air filling chamber, and the bottom plate are made of 316L material, while the remaining structures are preferably made of Q235A or Q345B.

[0057] Furthermore, the inner wall of the vibrating fluidized bed dryer 1 is provided with a wear-resistant ceramic plate with a thickness of not less than 10 mm; this reduces direct contact between the material and the metal, thus reducing wear.

[0058] In some embodiments, the exhaust gas treatment assembly 2 consists of a primary cyclone dust collector and a secondary water bath dust collector.

[0059] Through the coordinated purification of two-stage equipment, the gas separated by the cyclone dust collector (mainly containing VOCs, acidic gases and a small amount of dust) enters the water bath for washing. Through the synergistic effect of "physical absorption", VOCs and characteristic pollutants (such as H2S and benzo[a]pyrene) are efficiently removed.

[0060] Those skilled in the field know that traditional single dust removal processes (such as cyclone dust removal or water bath dust removal only) have problems such as low dust removal efficiency (cyclone dust removal has a fine particle removal rate of ≤80%, and water bath dust removal has a VOCs removal rate of ≤60%) and complex equipment (requiring multiple stages in series), making it difficult to meet the comprehensive purification needs of ammonium sulfate drying waste gas (containing ammonium sulfate dust, VOCs, and acidic gases).

[0061] This solution employs a combined process of cyclone dust collector (primary stage) and water bath dust collector (secondary stage); it requires only a cyclone dust collector and a water bath tower (traditional processes require multiple devices such as bag filters and activated carbon adsorption towers), reducing the footprint and investment costs; it also boasts high purification efficiency: ≥99.9% removal efficiency for ammonium sulfate dust (emission concentration ≤5mg / m³). 3 The VOCs removal efficiency is ≥99% (emission concentration ≤50mg / m³). 3 H2S removal efficiency ≥90% (emission concentration ≤35mg / m³) 3 It fully meets the policy requirements of the Ministry of Environmental Protection and the Ministry of Ecology and Environment, Document No. 5 of 2024 and Document No. 1 of 2024 of the Henan Provincial Environmental Protection Commission; it operates stably: the cyclone dust collector is anti-clogging (the ash hopper is unloaded regularly), the water bath dust collector is corrosion resistant (material is 316L stainless steel), and the system has a continuous operating time of ≥8000 hours / year (traditional process ≤5000 hours / year).

[0062] In some embodiments, the flange interface of the cyclone dust collector is equipped with a graphite spiral wound gasket to prevent leakage from bolt connection gaps.

[0063] In addition, based on the maximum air volume of the drying system (e.g., when the processing capacity is 50t / h, the exhaust gas air volume is 25000m³), 3 The cyclone dust collector uses a centrifugal induced draft fan (air volume 28000 m³ / h) and a system resistance of approximately 1500 Pa. 3 / h, wind pressure 2000Pa, motor power 30kW), to ensure stable collected air volume, and slightly greater than the system's air production volume (to avoid pressure leakage).

[0064] In some embodiments, the water bath dust collector is a scrubbing tower 8; The washing tower 8 is equipped with a wire mesh packing layer 81 and a spiral water distribution pipe 82 at intervals.

[0065] like Figure 14 , 15 As shown; the conveying spiral water distribution pipe 82 is laid above the wire mesh packing layer 81, and multiple nozzles are arranged downwards (nozzle spacing ≤200mm, coverage area ≥95%).

[0066] Technical personnel in the field know that traditional waste gas scrubbing towers (such as packed towers and plate towers) have problems such as complex internal components (packing layer, demister, spray pipe network), high operating resistance (≥1500Pa), low gas-liquid mass transfer efficiency (absorption efficiency ≤70%), and easy clogging (rapid increase in pressure difference of packing layer), making it difficult to meet the purification requirements of ammonium sulfate drying waste gas (high humidity, high dust, multi-component VOCs).

[0067] In this design, the scrubbing tower simplifies the structure and integrates functions, adopts a spiral arrangement of nozzles to improve the uniformity of scrubbing liquid distribution, and optimizes the internal components of the tower by eliminating the traditional packing layer and using a wire mesh packing layer to increase the gas-liquid contact area. Preferably, the scrubbing tower is made of 316L material, which is more corrosion resistant.

[0068] Furthermore, the cyclone dust collector is equipped with a vibrating motor in the ash hopper to further prevent clogging.

[0069] In this utility model, the connection port sealing is improved to ensure that the exhaust gas does not escape; a suitable induced draft fan is equipped to separate the collected VOCs gas through a bypass cyclone dust collector, and the separated ammonium sulfate enters the ash hopper; a two-stage purification system is constructed to wash and adsorb the gas separated by the cyclone dust collector, and the qualified gas is discharged after being detected by a monitoring device.

[0070] In some embodiments, the upper and lower parts of the vibrating fluidized bed dryer 1 are flexibly connected by a rubber ring 5; a soft connection is used in the middle to reduce the transmission of vibration between the lower cavity and the upper cover.

[0071] It is understandable that the upper and lower ends of the rubber ring 5 are provided with connecting edges, which are respectively sealed to the edges of the lower cavity and the upper cover of the vibrating fluidized bed dryer 1; the rubber ring 5 has a certain deformation range.

[0072] It should be noted that the upper part of the vibrating fluidized bed dryer 1 needs to have a support system.

[0073] Preferably, the upper part of the vibrating fluidized bed dryer 1 is suspended by a support column 11 provided on the outside.

[0074] like Figure 1 , 3 As shown; the support column 11 includes: an upright and a short horizontal bar; an assembly plate is provided on the vibrating fluidized bed dryer 1 and is assembled with the short horizontal bar (e.g., bolted or welded).

[0075] In some embodiments, the lower end of the vibrating fluidized bed dryer 1 is supported by an airbag shock absorber 6 and a damper 7.

[0076] Correspondingly, multiple support feet 12 with flat bottoms are fixedly installed on the outside of the vibrating fluidized bed dryer 1; airbag shock absorbers 6 and dampers 7 are installed between the foundation and the support feet 12 to provide lower support and shock absorption for the whole.

[0077] In some embodiments, the airbag damper 6 is an annular airbag, and the damper 7 is installed inside the airbag damper 6; the two work together to form a stable support, and the damper 7 is not exposed.

[0078] In some embodiments, it further includes a damping adjustment component.

[0079] The damping adjustment assembly includes: an internally threaded cylinder 71 fixed on the support 12, and an adjustable pressure body 72 threadedly fitted inside the internally threaded cylinder 71; a through hole is provided on the support 12; the top of the damper 7 enters the internally threaded cylinder 71 through the through hole and contacts the lower end of the pressure body 72.

[0080] When adjustments are needed, the support can be changed by adjusting the degree of screwing in or out of the pressure body 72.

[0081] It is understandable that the upper part of the pressure body 72 is equipped with a slot, a polygonal prism, or other structures to facilitate the application of force by the tool.

[0082] In some embodiments, a dome cap 73 is threaded onto the top of the damper 7.

[0083] like Figure 13 As shown, the dome cap 73 makes arc contact with the lower pressure body 72, making the adjustment smoother.

[0084] Furthermore, a circular groove 74 is provided at the lower end of the pressing body 72; the pressing body 72 and the dome cap 73 are in contact but not connected, and the circular groove 74 makes them fit together better.

[0085] In some embodiments, flange rings are provided at both ends of the metal bellows 4, and a guide rod 41 is assembled between the flange rings. A spring 42 is fitted on the guide rod 41. In normal conditions, the spring 42 presses against the two flange rings to expand the metal bellows 4 to a non-maximum length.

[0086] It is understandable that connecting bolts and guide rods 41 are staggered on the flange ring of the metal bellows 4; the nuts of the guide rods 41 are assembled on the outer end of the flange ring.

[0087] like Figure 8-10 As shown; short bolts are inserted through the flange ring to seal and assemble with the vibrating fluidized bed dryer 1 and the feeding conveyor assembly respectively (with graphite spiral wound gasket); the length of the guide rod 41 is greater than that of the metal bellows 4, and its two ends extend to the outside, and nuts are installed but not locked.

[0088] This invention systematically solves the pain points of traditional technologies through structural innovation and process optimization, demonstrating significant creativity and practicality, and providing key technical support for the ultra-low emission transformation of ammonium sulfate drying processes in the coking industry.

[0089] In this invention, the improved sealing structure avoids leakage caused by loose bolts and reduces maintenance frequency; the detachable design supports partial replacement without disassembling the entire conveying or centrifugal equipment, reducing operation and maintenance costs; the modular connecting components allow for quick disassembly and replacement; the base is supported by airbag shock absorbers 6 and dampers 7, reducing sealing failure caused by vibration transmission; the two-stage equipment, consisting of a primary cyclone dust collector and a secondary water bath dust collector, works together to achieve efficient removal of VOCs and characteristic pollutants; the footprint is reduced while the purification efficiency is high; a centrifugal induced draft fan ensures stable collected air volume; a spiral-arranged nozzle improves the uniformity of washing liquid distribution; a wire mesh packing layer increases the gas-liquid contact area; and the upper and lower parts of the vibrating fluidized bed dryer 1 are flexibly connected to reduce vibration transmission.

[0090] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A VOCs treatment device for an ammonium sulfate drying system, comprising: A vibrating fluidized bed dryer (1), a feeding conveying assembly, and an exhaust gas treatment assembly (2) are characterized in that the air inlet of the vibrating fluidized bed dryer (1) is connected to the hot air input via a stainless steel metal hose (3) and a high-temperature resistant silicone rubber sealing gasket; the air outlet of the vibrating fluidized bed dryer (1) is connected to the pipe interface of the exhaust gas treatment assembly (2) via a stainless steel metal hose (3) and a high-temperature resistant silicone rubber sealing gasket; and the vibrating fluidized bed dryer (1) and the feeding conveying assembly are connected by a metal corrugated pipe (4) and a graphite spiral wound gasket in a hard seal. The exhaust gas treatment component (2) consists of a primary cyclone dust collector and a secondary water bath dust collector.

2. The VOCs treatment device for the ammonium sulfate drying system according to claim 1, characterized in that, The upper and lower parts of the vibrating fluidized bed dryer (1) are flexibly connected by a rubber ring (5).

3. The VOCs treatment device for the ammonium sulfate drying system according to claim 2, characterized in that, The upper part of the vibrating fluidized bed dryer (1) is suspended by a support column (11) set on the outside.

4. The VOCs treatment device for the ammonium sulfate drying system according to claim 1, characterized in that, The lower end of the vibrating fluidized bed dryer (1) is supported by a base through an airbag shock absorber (6) and a damper (7).

5. The VOCs treatment device for the ammonium sulfate drying system according to claim 4, characterized in that, The airbag shock absorber (6) is an annular airbag, and the damper (7) is installed inside the airbag shock absorber (6).

6. The VOCs treatment device for the ammonium sulfate drying system according to claim 5, characterized in that, Also includes: Damping adjustment components; The damping adjustment assembly includes: an internally threaded cylinder (61) fixed on the support (12), and a pressure body (62) assembled inside the internally threaded cylinder (61).

7. The VOCs treatment device for the ammonium sulfate drying system according to claim 1, characterized in that, The inner wall of the vibrating fluidized bed dryer (1) is provided with a wear-resistant ceramic plate with a thickness of not less than 10 mm.

8. The VOCs treatment device for the ammonium sulfate drying system according to claim 1, characterized in that, The flange interface of the cyclone dust collector is equipped with a graphite spiral wound gasket; the cyclone dust collector uses a centrifugal induced draft fan with an air volume of 28,000 m³ / h. 3 / h, wind pressure 2000Pa.

9. The VOCs treatment device for the ammonium sulfate drying system according to claim 1, characterized in that, The metal bellows (4) is provided with flange rings at both ends, and a guide rod (41) is assembled between the flange rings. A spring (42) is fitted on the guide rod (41). In normal conditions, the spring (42) presses against the two flange rings to expand the metal bellows (4) to a non-maximum length.

10. The VOCs treatment device for the ammonium sulfate drying system according to claim 1, characterized in that, The water bath dust collector is a washing tower (8); the washing tower (8) is provided with a wire mesh packing layer (81) and a spiral water distribution pipe (82) at intervals.

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