Anti-blocking device of hydrogen sulfide rich gas separator
By introducing methanol into the wastewater treatment system through the hydrogen sulfide rich gas separator and utilizing denitrifying bacteria treatment and cleaning devices, the clogging problem of the hydrogen sulfide rich gas separator was solved, achieving stable system operation and optimized methanol usage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2026-04-03
AI Technical Summary
Low temperatures in the hydrogen sulfide rich gas separator cause CO2 and NH3 to react and form ammonium bicarbonate crystals, leading to pipeline blockage, frequent shutdowns for maintenance, and affecting the stable operation of the system.
Methanol is drawn from the outlet of the reflux pump in the thermal regeneration tower to the wastewater treatment system. The flow rate is controlled by the diversion pipe, the flow restriction pipe and the flow meter to reduce the ammonia content in the hydrogen sulfide-rich gas. Denitrifying bacteria are used to treat the methanol to prevent the formation of ammonium bicarbonate crystals. At the same time, a cleaning device is equipped to remove impurities from the flow restriction orifice plate.
It effectively prevents blockage of the hydrogen sulfide rich gas cooler, ensures continuous and stable system operation, reduces methanol consumption in wastewater treatment units, and reduces the frequency of shutdown and maintenance.
Smart Images
Figure CN224071595U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of separator anti-clogging devices, and in particular to an anti-clogging device for a hydrogen sulfide rich gas separator. Background Technology
[0002] The main task of low-temperature methanol washing is to utilize the selective absorption of CO2, H2S, etc. by methanol at low temperatures to remove CO2, H2S, organic sulfur (COS, CS2), HCN, naphtha, water and other impurities from the shift gas from the gasification workshop, thereby purifying the shift gas to meet the requirements of ammonia synthesis and methane synthesis in the synthesis unit. At the same time, the CO2 released from the methanol-rich methanol is sent to urea as the raw material gas for urea synthesis, and the released H2S is sent to the sulfur recovery section to produce sulfur.
[0003] The removal of sulfur-rich methanol takes place in a thermal regeneration tower. The methanol is heated to boiling point in a reboiler, causing dissolved CO2, H2S, NH3, etc., to be released. After the entrained methanol is separated by a hydrogen sulfide rich gas separator, it is sent to the sulfur recovery unit as feedstock for sulfur production. To prevent methanol vapor from entering the sulfur recovery unit along with the hydrogen sulfide rich gas, which could cause excessively high temperatures in the sulfur recovery reactor and the production of black sulfur, the temperature of the hydrogen sulfide rich gas removed from the thermal regeneration tower needs to be lowered to below -10°C to completely remove methanol vapor.
[0004] Because the temperature in the hydrogen sulfide rich gas separator is low, CO2 and NH3 react to form ammonium carbonate crystals (NH4HCO3), causing pipeline blockage. Therefore, the original unit needs to be frequently shut down to reheat the hydrogen sulfide rich gas separator. The reheating process requires shutting down the sulfur recovery unit to reduce sulfur production. In response to this problem, this application proposes an anti-blocking device for the hydrogen sulfide rich gas separator. Utility Model Content
[0005] To address the above issues and overcome the shortcomings of existing technologies, this utility model provides an anti-clogging device for a hydrogen sulfide rich gas separator. The solution includes a drainage pipe, characterized in that the drainage pipe flange is connected to the inlet end of a shut-off valve, the outlet flange of the shut-off valve is connected to the inlet end of a flow-limiting pipe, the outlet flange of the flow-limiting pipe is connected to the inlet end of a flow meter, the outlet flange of the flow meter is connected to the inlet end of a conduit, an installation box is integrally arranged on the right side of the inlet end of the flow-limiting pipe, a sealing cover is detachably connected to the upper end of the installation box, a connecting plate abuts against the right side wall of the installation box, two longitudinally spaced positioning holes are provided on the connecting plate, two positioning studs corresponding to the positioning holes are fixedly connected to the inner wall of the right side of the installation box, each positioning stud is threaded with a nut abutting against the connecting plate, a flow-limiting orifice plate adapted to the inner wall of the flow-limiting pipe is integrally connected to the lower end of the connecting plate, and a cleaning device used in conjunction with the flow-limiting orifice plate is connected to the sealing cover.
[0006] Preferably, the cleaning device includes an electric telescopic rod fixedly connected to the inner wall of the end cap, an arc-shaped bracket fixedly connected to the telescopic end of the electric telescopic rod, and an arc-shaped scraper fixedly connected to the arc-shaped bracket abutting against the flow-limiting orifice plate.
[0007] Preferably, the upper edge of the mounting box is fixedly connected to a lower flange, and the lower edge of the sealing cover is fixedly connected to an upper flange that mates with the lower flange. The upper flange and the lower flange are connected by bolts.
[0008] The beneficial effects of this utility model are:
[0009] In this application, to prevent the formation of ammonium bicarbonate crystals, a stream of methanol is discharged from the outlet of the thermal regeneration tower reflux pump to the wastewater treatment system. This reduces the ammonia content in the hydrogen sulfide-rich gas, effectively preventing blockage of the hydrogen sulfide-rich gas cooler and ensuring continuous and stable system operation. Simultaneously, this methanol stream is fed to the wastewater treatment unit to feed denitrifying bacteria, reducing the methanol consumption of the wastewater treatment unit. Attached Figure Description
[0010] Figure 1 This is a first-person perspective stereoscopic view of the present invention.
[0011] Figure 2 This is a partial stereoscopic view of the present invention from a second perspective.
[0012] Figure 3 This is a partial stereoscopic view of the present invention from a third-person perspective.
[0013] Figure 4 This is a partial stereoscopic view of the present invention from a fourth perspective.
[0014] Figure Labels
[0015] 1. Drainage pipe, 2. Shut-off valve, 3. Flow restrictor, 4. Flow meter, 5. Conduit, 6. Mounting box, 7. Sealing cap, 8. Connecting plate, 9. Positioning hole, 10. Positioning stud, 11. Nut, 12. Flow restrictor plate, 13. Electric telescopic rod, 14. Arc bracket, 15. Arc scraper, 16. Lower flange, 17. Upper flange, 18. Bolt. Detailed Implementation
[0016] The following is in conjunction with the appendix Figure 1-4 The specific embodiments of this utility model will be described in further detail.
[0017] In Example 1, the technical solution is as follows: In the existing low-temperature methanol washing system, a branch pipe is led out from the exhaust pipe of the thermal regeneration tower reflux pump and connected to the inlet end of the diversion pipe 1 in this application (the specific connection method will not be described in this application). This allows a stream of methanol to be drawn from the exhaust pipe of the thermal regeneration tower reflux pump into the diversion pipe 1. The methanol contains CO2, H2S, and NH3. Drawing out the methanol can reduce the ammonia content of hydrogen sulfide-rich gas, thereby preventing CO2 and NH3 from reacting to form ammonium carbonate crystals and causing blockage of the hydrogen sulfide-rich gas separator. The outlet end of the conduit 5 is connected to the existing sewage treatment device in the plant area (the specific connection method will not be described in this application). This allows the methanol to be sent into the sewage treatment device to feed denitrifying bacteria, reducing the methanol consumption of the sewage treatment device.
[0018] In Example 2, based on Example 1, when this application is in use, a stream of methanol vapor is drawn from the exhaust pipe of the thermal regeneration tower reflux pump and enters the inlet pipe 1. Then, this methanol enters the flow-limiting pipe 3 through the shut-off valve 2. The flow-limiting pipe 3 is a DN25 pipe. A flow-limiting orifice plate 12 is arranged in the flow-limiting pipe 3 through the mounting box 6. With the help of the flow meter 4, the methanol flow rate is controlled at 100L / h. The methanol drawn out can then be sent to the wastewater treatment device in the plant area through the flow-limiting pipe 3, the flow meter 4, and the conduit 5 to reduce the ammonia content in the hydrogen sulfide rich gas, effectively prevent the blockage of the hydrogen sulfide rich gas cooler, and enable the system to operate continuously and stably. At the same time, this methanol is sent to the wastewater treatment device to feed denitrifying bacteria, reducing the methanol consumption of the wastewater treatment device.
[0019] Analysis of the ammonia content in the lean methanol of the thermal regeneration tower showed that it was above 200 mg / L before the application of this invention, but below 50 mg / L after the application of this invention. Furthermore, no blockage has occurred for six consecutive months, while the original unit blocked once a month on average.
[0020] In Example 3, building upon Example 2, to further prevent other substances mixed in the extracted methanol from forming ammonium carbonate crystals on the flow-limiting orifice plate 12 and thus clogging it, a cleaning device is installed inside the sealing cover 7. During use, the electronic telescopic rod is periodically activated to extend and retract. This extension and retraction causes the arc-shaped support 14 to move up and down, which in turn causes the arc-shaped scraper 15 to move up and down along the flow-limiting orifice plate 12, allowing it to remove impurities adhering to the orifice plate 12 and ensuring its effectiveness. Furthermore, for ease of maintenance, the sealing cover 7 and the mounting box 6 are detachably connected via an upper flange 17, a lower flange 16, and bolts 18, facilitating the opening of the sealing cover 7. Simultaneously, the flow-limiting orifice plate 12 is also detachably connected to the mounting box 6 via positioning holes 9 on the connecting plate 8, positioning studs 10 on the mounting side wall, and nuts 11, facilitating maintenance.
Claims
1. A clogging prevention device for a hydrogen sulfide rich gas separator, comprising a drain pipe (1), characterized in that, The inlet end of the drain pipe (1) is flanged and connected to the inlet end of the shut-off valve (2). The outlet end flange of the shut-off valve (2) is flanged and connected to the inlet end of the flow-limiting pipe (3). The outlet end flange of the flow-limiting pipe (3) is flanged and connected to the inlet end of the flow meter (4). The outlet end flange of the flow meter (4) is flanged and connected to the inlet end of the conduit (5). An installation box (6) is integrally arranged on the right side of the inlet end of the flow-limiting pipe (3). A sealing cover (7) is detachably connected to the upper end of the installation box (6). A connecting plate (7) is abutted against the right side wall of the installation box (6). 8) The connecting plate (8) has two positioning holes (9) arranged longitudinally at intervals. The inner wall of the right side of the mounting box (6) is fixedly connected to two positioning studs (10) that are inserted into the positioning holes (9) one by one. Each positioning stud (10) is threadedly connected to a nut (11) that abuts against the connecting plate (8). The lower end of the connecting plate (8) is integrally connected to a flow limiting plate (12) that is adapted to the inner wall of the flow limiting tube (3). The sealing cover (7) is connected to a cleaning device that works in conjunction with the flow limiting plate (12).
2. The anti-clogging device for a hydrogen sulfide rich gas separator according to claim 1, characterized in that, The cleaning device includes an electric telescopic rod (13) fixedly connected to the inner wall of the end cap. The telescopic end of the electric telescopic rod (13) is fixedly connected to an arc-shaped bracket (14). The arc-shaped bracket (14) is fixedly connected to an arc-shaped scraper (15) that abuts against the flow-limiting orifice plate (12).
3. The anti-clogging device for a hydrogen sulfide rich gas separator according to claim 1, characterized in that, The upper edge of the mounting box (6) is fixedly connected to a lower flange (16), and the lower edge of the sealing cover (7) is fixedly connected to an upper flange (17) that works with the lower flange (16). The upper flange (17) and the lower flange (16) are connected by bolts (18).