A self-cleaning apparatus for the removal of sulfur from hf crude
By introducing self-cleaning equipment into HF production, and utilizing ultrasonic devices and protective structures, the high risk and high labor intensity of HF coarse cold desulfurization cleaning have been solved, achieving safe and effective cleaning results and reducing the labor intensity of workers and the risk of equipment corrosion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU SANMEI CHEM
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-14
AI Technical Summary
In the existing HF production process, the crude cold desulfurization cleaning method is highly dangerous and labor-intensive. In particular, the toxicity and corrosiveness of HF make manual cleaning difficult and can easily lead to a decrease in negative pressure and shutdown accidents.
Design a self-cleaning device that uses an ultrasonic cleaner to perform ultrasonic cleaning on the coarse cooling shell and heat exchange tubes without opening the flange cover. Combined with protective plates, side wall plates and rubber sheets to protect the ultrasonic cleaner, reduce manual operation and corrosion risks.
It achieves a safe and efficient cleaning process, reduces the labor intensity of workers, reduces the risk of HF residue, and avoids negative pressure reduction and shutdown accidents.
Smart Images
Figure CN224487044U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of HF coarse cold desulfurization technology, and in particular to a self-cleaning device for HF coarse cold desulfurization. Background Technology
[0002] Hydrogen fluoride, with the chemical formula HF, is a polar molecule. At room temperature and pressure (25℃, 101.325kPa), it is a colorless, toxic gas with an irritating odor. It is highly hygroscopic and corrosive. When exposed to air, it easily combines with water vapor to produce white mist (acid mist). It is readily soluble in water, and its aqueous solution is hydrofluoric acid (a monoprotic weak acid). At room temperature, its ionization constant in aqueous solution is 6.3×10-4 (pKa=3.17).
[0003] During HF production, the fluorite raw material contains metal sulfides, which react with sulfuric acid to produce hydrogen sulfide, which further reacts with sulfuric acid decomposition products SO2 and SO3 to produce elemental sulfur. As the reaction gas gradually cools, most of the elemental sulfur crystallizes in the coarse condenser section. This leads to a decrease in negative pressure during HF production, causing gas leaks and potentially shutdowns. Therefore, it is necessary to frequently monitor the negative pressure and clean the coarse condenser section regularly. Generally, when the sulfur content is around 200 ppm, a switching and cleaning process should be performed every 4 days.
[0004] Currently, the existing cleaning method involves first rinsing with water to remove acid, then having workers wearing chemical protective suits open the upper flange cover and use steel brushes to remove sulfur. Because HF is highly toxic, even after rinsing with water, residual acid water and fumes remain, making this process highly dangerous. Furthermore, wearing chemical protective suits for manual labor in hot weather is also quite strenuous for employees. To improve safety and reduce worker fatigue, we have designed and introduced an ultrasonic vibrating plate into the rough cooling equipment. This ultrasonic cleaning method enables automatic cleaning without opening the upper flange cover. Utility Model Content
[0005] In view of the shortcomings of the existing technology, this utility model provides a self-cleaning device for HF coarse cooling desulfurization.
[0006] The purpose of this utility model is achieved as follows: a self-cleaning device for HF coarse cooling desulfurization includes a coarse cooling shell, a lower end cap provided at the lower part of the coarse cooling shell, an upper end cap provided at the upper part of the coarse cooling shell, and a heat exchange tube fixedly installed on the inner wall of the coarse cooling shell.
[0007] The lower end cap is equipped with a cleaning mechanism, which includes a positioning ring for positioning and installation. Multiple storage boxes are fixedly installed on the lower part of the positioning ring, and several ultrasonic devices are fixedly installed inside the storage boxes. Several corresponding protective plates are connected to the upper part of the positioning ring through a connecting component.
[0008] Furthermore, the connecting assembly includes elastic sheets disposed on both sides, and a connecting portion for fixed connection with the positioning ring and the protective plate is provided between the elastic sheets on both sides.
[0009] Furthermore, enlarged plates are fixedly provided on the inner sides of the upper and lower connecting parts respectively, and several return springs are fixedly installed between the two enlarged plates.
[0010] Furthermore, side wall panels that fit against the outer wall of the storage box are fixedly provided on both sides of the protective plate, and a rubber sheet connected to the upper surface of the storage box is fixedly provided between the two side wall panels.
[0011] Furthermore, the two ends of the rough cooling shell are respectively sealed to the lower end and the upper end via connecting flanges, and lifting lugs are welded to both sides of the upper end of the rough cooling shell.
[0012] Furthermore, the upper end face of the upper end cap is connected to a cleaning water inlet pipe, the side end face of the upper end cap is connected to a reaction gas inlet pipe, the lower end face of the lower end cap is connected to a cleaning water outlet pipe, and the side end face of the lower end cap is connected to a reaction gas outlet pipe.
[0013] Furthermore, one end of the heat exchange tube is fixedly provided with a cooling water outlet pipe that passes through the upper end of the coarse cooling shell, and the other end of the heat exchange tube is fixedly provided with a cooling water inlet pipe that passes through the lower end of the coarse cooling shell. Several baffles for fixing and installing the heat exchange tube are fixedly provided inside the coarse cooling shell.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0015] In use, this invention uses a cleaning mechanism to vibrate and dislodge the elemental sulfur crystals inside the coarse cooling shell. Specifically, the ultrasonic vibration of the ultrasonic device in the cleaning mechanism provides ultrasonic impact to the coarse cooling shell and heat exchange tubes, which facilitates the dislodging of the elemental sulfur crystals on the coarse cooling shell and heat exchange tubes. This prevents most of the elemental sulfur crystals from remaining in the coarse cooling section, which could lead to a decrease in negative pressure and gas leakage during HF production, resulting in shutdown. The cleaning mechanism eliminates the need for manual operation, reducing the dangers of manual operation and the labor intensity of workers.
[0016] Furthermore, the cleaning mechanism includes a protective plate, side wall plates, and rubber sheets to protect the ultrasonic device in the storage box, reducing the entry of hydrogen fluoride during production and preventing corrosion and damage to the ultrasonic device. In order to allow the protective plate to be adjusted adaptively, the plate is enlarged to connect to the reset spring, and an elastic sheet is installed through the connecting part. The elasticity of the elastic sheet supports the reset spring, which can reduce the continuous vibration of the reset spring under the impact of the ultrasonic device. It can effectively achieve adaptive adjustment while protecting the ultrasonic device. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of this utility model.
[0019] Figure 2 This is a schematic diagram of the internal structure of this utility model.
[0020] Figure 3 This is a schematic diagram of the cleaning mechanism of this utility model.
[0021] Figure 4 This is an exploded schematic diagram of the cleaning mechanism of this utility model.
[0022] Figure 5 This is the utility model Figure 4 Enlarged diagram of point A in the middle.
[0023] In the diagram: 1. Rough cooling shell; 2. Lower head; 3. Upper head; 4. Heat exchange tube; 5. Cooling water discharge pipe; 6. Cooling water inlet pipe; 7. Cleaning mechanism; 701. Positioning ring; 702. Storage box; 703. Ultrasonic device; 704. Protective plate; 705. Side wall plate; 706. Rubber sheet; 707. Elastic sheet; 708. Connecting part; 709. Enlarging plate; 710. Return spring; 8. Lifting lug; 9. Cleaning water inlet pipe; 10. Cleaning water discharge pipe; 11. Reaction gas inlet pipe; 12. Reaction gas outlet pipe; 13. Connecting flange. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] like Figures 1-5 The self-cleaning device for HF coarse cooling desulfurization shown includes a coarse cooling shell 1, a lower end cap 2 at the lower part of the coarse cooling shell 1, an upper end cap 3 at the upper part of the coarse cooling shell 1, and a heat exchange tube 4 fixedly installed on the inner wall of the coarse cooling shell 1.
[0026] The lower end cap 2 is equipped with a cleaning mechanism 7, which includes a positioning ring 701 for positioning and installation. Multiple storage boxes 702 are fixedly installed on the lower part of the positioning ring 701. Several ultrasonic devices 703 are fixedly installed inside the storage boxes 702. Several corresponding protective plates 704 are connected to the upper part of the positioning ring 701 through a connecting component.
[0027] In this embodiment, preferably, the connecting assembly includes elastic sheets 707 disposed on both sides, and a connecting portion 708 for fixed connection with the positioning ring 701 and the protective plate 704 is provided between the elastic sheets 707 on both sides.
[0028] It should be noted that the positioning ring 701 and the protective plate 704 are connected by the upper and lower connecting parts 708 to maintain the stability of the connection. Elastic sheets 707 are provided on both sides of the two connecting parts 708 to absorb the impact force generated by the ultrasonic wave 703 on the protective plate 704.
[0029] In this embodiment, preferably, enlarged plates 709 are fixedly provided on the inner sides of the upper and lower connecting parts 708 respectively, and a plurality of return springs 710 are fixedly installed between the two enlarged plates 709.
[0030] It should be noted that the setting of the enlarged plate 709 enables the fixed installation of the return spring 710, and the setting of the return spring 710 enables the support of the protective plate 704, maintaining the stability of the protective plate 704, and absorbing the impact force generated by the ultrasonic device 703 on the protective plate 704.
[0031] In this embodiment, preferably, the protective plate 704 is fixedly provided with side wall plates 705 that fit against the outer wall of the storage box 702 on both sides, and a rubber sheet 706 connected to the upper surface of the storage box 702 is fixedly provided between the two side wall plates 705.
[0032] It should be noted that the side wall panel 705 is designed to fit the outer wall of the storage box 702, which can effectively prevent hydrogen fluoride from entering the interior of the storage box 702. The rubber sheet 706 is located at the end, which can improve the sealing performance and effectively prevent hydrogen fluoride from corroding the ultrasonic device 703, thereby improving the safety and lifespan of the ultrasonic device 703.
[0033] In this embodiment, preferably, the two ends of the rough cooling shell 1 are sealed to the lower end 2 and the upper end 3 respectively through connecting flanges 13, and lifting lugs 8 are welded to the upper ends of the rough cooling shell 1 on both sides respectively;
[0034] It should be noted that the lower end cap 2 and the upper end cap 3 are sealed together by connecting flange 13, which improves the sealing performance while maintaining a safe connection. The lifting lug 8 is used to fix the rough cooling shell 1 in place.
[0035] In this embodiment, preferably, the upper end face of the upper end cap 3 is connected to a cleaning water inlet pipe 9, the side end face of the upper end cap 3 is connected to a reaction gas inlet pipe 11, the lower end face of the lower end cap 2 is connected to a cleaning water outlet pipe 10, and the side end face of the lower end cap 2 is connected to a reaction gas outlet pipe 12.
[0036] It should be noted that the cleaning water inlet pipe 9 and the cleaning water outlet pipe 10 are set up to realize the water supply input, so as to realize the cleaning of the crystallized elemental sulfur, and the reaction gas inlet pipe 11 and the reaction gas outlet pipe 12 are set up to realize the input and discharge of the generated hydrogen sulfide.
[0037] In this embodiment, preferably, one end of the heat exchange tube 4 is fixedly provided with a cooling water discharge pipe 5 that passes through the upper end of the coarse cooling shell 1, and the other end of the heat exchange tube 4 is fixedly provided with a cooling water input pipe 6 that passes through the lower end of the coarse cooling shell 1. A plurality of baffles for fixing and installing the heat exchange tube 4 are fixedly provided inside the coarse cooling shell 1.
[0038] It should be noted that the cooling water discharge pipe 5 and cooling water inlet pipe 6 are designed to circulate the cooling water, which facilitates the cooling and temperature reduction of hydrogen sulfide. In addition, the baffle plate not only allows for the fixed installation of the heat exchange tube 4, but also guides and disperses the cleaning water, enabling the internal elemental sulfur to be flushed.
[0039] The specific usage process of this utility model is as follows:
[0040] During operation, the reaction gas is input and output through the reaction gas input pipe 11 and the reaction gas output pipe 12. When the reaction gas is input, the cooling water is circulated in the heat exchange pipe 4 through the cooling water output pipe 5 and the cooling water input pipe 6 to facilitate the cooling of the reaction gas. Since the fluorite raw material contains metal sulfides, the reaction gas reacts with sulfuric acid to generate hydrogen sulfide, which further reacts with sulfuric acid decomposition products SO2 and SO3 to generate elemental sulfur. As the reaction gas is gradually cooled, most of the elemental sulfur crystallizes in the coarse cooling section. This will cause the negative pressure to decrease during HF production, resulting in gas leakage and shutdown. Therefore, it is necessary to frequently monitor the negative pressure and clean the HF coarse cooling section.
[0041] When the negative pressure inside the coarse cooling shell 1 decreases, the reaction gas inlet pipe 11 and the reaction gas outlet pipe 12 are then closed. After disconnecting from the reaction section, water is first supplied through the cleaning water inlet pipe 9 and the cleaning water outlet pipe 10. The coarse cooling shell 1 is equipped with baffles inside, which disperse the cooling water flow when it reaches the baffles, facilitating the rinsing of elemental sulfur and removal of residual HF. Water is then added until full, and steam is introduced through the cooling water outlet pipe 5 and the cooling water inlet pipe 6 to heat the water to 50°C. The ultrasonic cleaner 703 is then turned on, and ultrasonic cleaning is performed for approximately 2 hours. During ultrasonic cleaning by the ultrasonic cleaner 703, the side wall plate 705 is designed to facilitate contact with the outer wall of the storage box 702. Effectively preventing hydrogen fluoride from entering the storage box 702, and with the rubber sheet 706 at the end, the sealing performance is improved, effectively preventing hydrogen fluoride from corroding the ultrasonic device 703, improving the safety and lifespan of the ultrasonic device 703. Furthermore, the elastic sheet 707 and the return spring 710 support the protective plate 704 and maintain adaptive adjustment, and also absorb the impact force generated by the ultrasonic device 703, preventing the return spring 710 from vibrating continuously. Then, the wastewater and elemental sulfur are drained through the cleaning water discharge pipe 10, completing the cleaning process. Afterward, the steam and cleaning water inlet pipe 9 are turned on, and air is blown in through the cleaning water discharge pipe 10 to purge until dry, completing the rough cold cleaning.
[0042] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A self-cleaning device for HF coarse cooling desulfurization, characterized in that: It includes a coarse cooling shell (1), the lower part of the coarse cooling shell (1) is provided with a lower end cap (2), the upper part of the coarse cooling shell (1) is provided with an upper end cap (3), and a heat exchange tube (4) is fixedly installed on the inner wall of the coarse cooling shell (1). The lower end cap (2) is provided with a cleaning mechanism (7), which includes a positioning ring (701) for positioning and installation. Multiple storage boxes (702) are fixedly installed on the lower part of the positioning ring (701). Several ultrasonic devices (703) are fixedly installed inside the storage boxes (702). Several corresponding protective plates (704) are connected to the upper part of the positioning ring (701) through a connecting component.
2. The self-cleaning device for HF coarse cooling desulfurization according to claim 1, characterized in that: The connecting assembly includes elastic sheets (707) disposed on both sides, and a connecting part (708) is provided between the elastic sheets (707) on both sides for fixed connection with the positioning ring (701) and the protective plate (704).
3. The self-cleaning device for HF coarse cooling desulfurization according to claim 2, characterized in that: An enlarged plate (709) is fixedly provided on the inner side of the upper and lower connecting parts (708), and a plurality of return springs (710) are fixedly installed between the two enlarged plates (709).
4. The self-cleaning device for HF coarse cooling desulfurization according to claim 3, characterized in that: The protective plate (704) has side wall panels (705) fixedly attached to the outer wall of the storage box (702) on both sides, and a rubber sheet (706) is fixedly attached between the two side wall panels (705) and connected to the upper surface of the storage box (702).
5. A self-cleaning device for HF coarse cooling desulfurization according to claim 1, characterized in that: The two ends of the rough cooling shell (1) are sealed to the lower end (2) and the upper end (3) respectively through connecting flanges (13), and lifting lugs (8) are welded to the upper ends of the rough cooling shell (1) on both sides respectively.
6. The self-cleaning device for HF coarse cooling desulfurization according to claim 1, characterized in that: The upper end face of the upper end cap (3) is connected to a cleaning water inlet pipe (9), the side end face of the upper end cap (3) is connected to a reaction gas inlet pipe (11), the lower end face of the lower end cap (2) is connected to a cleaning water outlet pipe (10), and the side end face of the lower end cap (2) is connected to a reaction gas outlet pipe (12).
7. The self-cleaning device for HF coarse cooling desulfurization according to claim 1, characterized in that: One end of the heat exchange tube (4) is fixedly provided with a cooling water discharge pipe (5) that passes through the upper end of the coarse cooling shell (1), and the other end of the heat exchange tube (4) is fixedly provided with a cooling water input pipe (6) that passes through the lower end of the coarse cooling shell (1). Several baffles for fixing and installing the heat exchange tube (4) are fixedly provided inside the coarse cooling shell (1).