Liquid nitrogen wash molecular sieve regeneration device
By adding a displacement process to the molecular sieve regeneration device, the accumulated H2 and CO gases are replaced and incinerated in the flare, which solves the problem of toxic gas diffusion in the early stage of molecular sieve regeneration preheating, ensuring production safety and environmental protection.
Patent Information
- Application Number
- CN202520491640.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-20
AI Technical Summary
During the molecular sieve regeneration process, the H2 and CO gases accumulated in the early stage of preheating are desorbed and sent to the hydrogen sulfide concentration tower, which leads to the diffusion of toxic and flammable gases, frequently triggering alarms, affecting production safety and the environment, and may cause environmental pollution.
A displacement process is added to the molecular sieve regeneration device, using low-pressure nitrogen to replace the accumulated H2 and CO gases in the flare for combustion. The nitrogen is then treated by a heater and cooler to ensure safe and efficient utilization.
This effectively avoids the diffusion of toxic gases during the initial preheating stage of molecular sieve regeneration, reduces frequent alarms, improves production safety and environmental protection, and lowers environmental risks.
Smart Images
Figure CN223901876U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to molecular sieve technical field, it is a liquid nitrogen washing molecular sieve regeneration device. BACKGROUND
[0002] Currently, in the chemical production process, the operation of liquid nitrogen washing molecular sieve regeneration is a key link, which mainly relies on the low-pressure nitrogen gas provided by the air separation device to complete. This process not only involves the regeneration of molecular sieve, but also includes the effective utilization of nitrogen gas after regeneration. Specifically, the steps of liquid nitrogen washing molecular sieve regeneration are realized through the following eight stages: pressure relief, preheating, heating, cooling, pressure increase, temperature decrease, waiting and switching. The careful design of these steps aims to ensure that the molecular sieve can effectively restore its adsorption capacity, and the regenerated nitrogen gas is sent to the low-temperature methanol washing hydrogen sulfide concentration tower as stripping nitrogen gas to improve the removal efficiency of hydrogen sulfide.
[0003] However, in actual operation, in the preheating initial stage of molecular sieve regeneration, the H2 (hydrogen) and CO (carbon monoxide) stored in the adsorber are desorbed and sent together into the hydrogen sulfide concentration tower along with the nitrogen gas flow. These gases will then be discharged into the atmosphere along with the tail gas of the hydrogen sulfide concentration tower. Because the density of carbon monoxide is very close to that of air, during the high-altitude discharge of the tail gas, CO is easily mixed with a large amount of CO2 (carbon dioxide) and sinks to the ground along with the gas flow, eventually entraining into various production device areas.
[0004] This phenomenon leads to the widespread diffusion of toxic and flammable gases H2 and CO, triggering frequent alarms of the gas detection system in the production area. This frequent alarm not only causes the flooding of the alarm system, but also seriously disrupts the normal work order of the chemical plant operators. Operators have to frequently respond to these alarms, which not only consumes a large amount of their time and energy, but also may reduce their alertness to real safety risks due to frequent false alarms. In addition, the sinking and diffusion of this gas may also cause potential harm to the surrounding environment, increasing the risk of environmental pollution and adversely affecting the social image and legal liability of the enterprise. Therefore, it is urgent to take measures to solve this problem and ensure the safety, environmental protection and efficiency of the production process. SUMMARY
[0005] The utility model provides a kind of liquid nitrogen washing molecular sieve regeneration device, overcome the above prior art, it can effectively solve the problem that the H2, CO gas stored, desorbed in first molecular sieve adsorber tank in preheating initial stage in the regeneration process of existing first molecular sieve adsorber, causes the widespread frequent alarm of toxic and flammable gas in chemical production device area.
[0006] The technical scheme of the utility model is realized through the following measures: a liquid nitrogen washing molecular sieve regeneration device, including first molecular sieve adsorber, second molecular sieve adsorber and hydrogen sulfide concentration tower, the low-pressure nitrogen pipeline is fixedly connected in the lower inlet of hydrogen sulfide concentration tower, the tail gas venting pipeline is fixedly connected in the top outlet of hydrogen sulfide concentration tower, the first low-temperature methanol washing purified gas inlet pipeline is fixedly connected in the bottom inlet of first molecular sieve adsorber, the second low-temperature methanol washing purified gas inlet pipeline is fixedly connected between the bottom inlet of second molecular sieve adsorber and the first low-temperature methanol washing purified gas inlet pipeline, the first molecular sieve purified gas outlet pipeline is fixedly connected in the top outlet of first molecular sieve adsorber, the second molecular sieve purified gas outlet pipeline is fixedly connected between the top outlet of second molecular sieve adsorber and the first molecular sieve purified gas outlet pipeline, the first communication pipeline is fixedly connected between the first molecular sieve purified gas outlet pipeline and the second molecular sieve purified gas outlet pipeline between first molecular sieve adsorber and second molecular sieve purified gas outlet pipeline, the second communication pipeline is fixedly connected between the first low-temperature methanol washing purified gas inlet pipeline and the second low-temperature methanol washing purified gas inlet pipeline between first molecular sieve adsorber and the second low-temperature methanol washing purified gas inlet pipeline, the first treatment pipeline is fixedly connected between the first communication pipeline and the low-pressure nitrogen pipeline, the second treatment pipeline is fixedly connected between the low-pressure nitrogen pipeline and the second communication pipeline between the first treatment pipeline and hydrogen sulfide concentration tower, the heater is fixedly installed on the first treatment pipeline, the cooler is fixedly installed on the second treatment pipeline, the second treatment pipeline is fixedly connected with the flare removal pipeline between the cooler and the low-pressure nitrogen pipeline.
[0007] The following is the further optimization or / and improvement of the above-mentioned utility model technical scheme:
[0008] The electric control valve one is fixedly installed on the above-mentioned flare removal pipeline, the electric control valve two is fixedly installed on the second treatment pipeline between the flare removal pipeline and the low-pressure nitrogen pipeline, and the electric control valve one and the electric control valve two are interlocked controlled.
[0009] The third communication pipeline is fixed between the first low-temperature methanol washing purified gas inlet pipeline between the above-mentioned second communication pipeline and the second low-temperature methanol washing purified gas inlet pipeline and the second low-temperature methanol washing purified gas inlet pipeline between the second communication pipeline and the first low-temperature methanol washing purified gas inlet pipeline, the molecular sieve pressure relief pipeline is fixedly connected on the third communication pipeline, and the pressure relief valve is fixedly installed on the molecular sieve pressure relief pipeline.
[0010] The heater is fixedly installed on the above-mentioned first treatment pipeline, and the cooler is fixedly installed on the second treatment pipeline between the flare removal pipeline and the second communication pipeline.
[0011] The rich methanol inlet pipeline is fixedly connected in the upper inlet of the above-mentioned hydrogen sulfide concentration tower, and the rich methanol outlet pipeline is fixedly connected in the bottom outlet of hydrogen sulfide concentration tower.
[0012] The utility model discloses reasonable and compact structure, convenient to use has increased the replacement process before the first molecular sieve adsorber regeneration preheating, utilizes low pressure nitrogen gas to carry out replacement to the gas containing H2, CO that accumulates and sweeps to the flare incineration, effectively avoided the H2, CO gas of first molecular sieve adsorber tank accumulation, desorption in the first molecular sieve adsorber preheating initial stage in the regeneration process of first molecular sieve adsorber, causes the wide range frequent alarm of toxic combustible gas in chemical production device area, safe, effective. BRIEF DESCRIPTION OF DRAWINGS
[0013] ATTACHED Figure 1 It is the process flow schematic diagram of the utility model.
[0014] ATTACHED Figure 1 The codes in the figure are as follows: 1 is the first molecular sieve adsorber, 2 is the second molecular sieve adsorber, 3 is the hydrogen sulfide concentration tower, 4 is the pressure relief valve, 5 is the low-pressure nitrogen gas pipeline, 6 is the tail gas venting pipeline, 7 is the first low-temperature methanol washing purified gas inlet pipeline, 8 is the second low-temperature methanol washing purified gas inlet pipeline, 9 is the first molecular sieve purified gas outlet pipeline, 10 is the second molecular sieve purified gas outlet pipeline, 11 is the first communication pipeline, 12 is the second communication pipeline, 13 is the third communication pipeline, 14 is the molecular sieve pressure relief pipeline, 15 is the first treatment pipeline, 16 is the second treatment pipeline, 17 is the heater, 18 is the cooler, 19 is the flare pipeline, 20 is the electric control valve one, 21 is the electric control valve two, 22 is the rich methanol inlet pipeline, and 23 is the rich methanol outlet pipeline. DETAILED DESCRIPTION
[0015] The utility model is not limited by the following embodiments, and the specific implementation can be determined according to the technical scheme and actual situation of the utility model.
[0016] In the utility model, if no special instruction is given, the equipment and device used are all the equipment and device commonly known in the art. For example, the first molecular sieve adsorber 1, the first molecular sieve adsorber 2, the hydrogen sulfide concentration tower 3, the heater 17 and the cooler 18 can be the commonly known equipment.
[0017] In the utility model, in order to facilitate the description, the relative position relation of each component is described according to the layout mode of the drawings attached to the specification, for example, the position relation of front, back, top, bottom, left and right is determined according to the layout direction of the drawings attached to the specification. Figure 1 Figure 1
[0018] The utility model will be further described in connection with the embodiments and drawings as follows:
[0019] Embodiment 1: as attached Figure 1 As shown, the liquid nitrogen washing molecular sieve regeneration device includes a first molecular sieve adsorber 1, a second molecular sieve adsorber 2 and a hydrogen sulfide concentration tower 3, a low-pressure nitrogen gas pipeline 5 is fixedly connected to the lower inlet of the hydrogen sulfide concentration tower 3, a tail gas venting pipeline 6 is fixedly connected to the top outlet of the hydrogen sulfide concentration tower 3, a first low-temperature methanol washing purified gas inlet pipeline 7 is fixedly connected to the bottom inlet of the first molecular sieve adsorber 1, a second low-temperature methanol washing purified gas inlet pipeline 8 is fixedly connected between the bottom inlet of the second molecular sieve adsorber 2 and the first low-temperature methanol washing purified gas inlet pipeline 7, a first molecular sieve purified gas outlet pipeline 9 is fixedly connected to the top outlet of the first molecular sieve adsorber 1, a second molecular sieve purified gas outlet pipeline 10 is fixedly connected between the top outlet of the second molecular sieve adsorber 2 and the first molecular sieve purified gas outlet pipeline 9, a first communication pipeline 11 is fixedly connected between the first molecular sieve purified gas outlet pipeline 9 and the second molecular sieve purified gas outlet pipeline 10 between the first molecular sieve adsorber 1 and the second molecular sieve purified gas outlet pipeline 10, a second communication pipeline 12 is fixedly connected between the first low-temperature methanol washing purified gas inlet pipeline 7 and the second low-temperature methanol washing purified gas inlet pipeline 8 between the first molecular sieve adsorber 1 and the second low-temperature methanol washing purified gas inlet pipeline 8, a first treatment pipeline 15 is fixedly connected between the first communication pipeline 11 and the low-pressure nitrogen gas pipeline 5, a second treatment pipeline 16 is fixedly connected between the low-pressure nitrogen gas pipeline 5 and the second communication pipeline 12 between the first treatment pipeline 15 and the hydrogen sulfide concentration tower 3, and a flare removal pipeline 19 is fixedly connected to the second treatment pipeline 16.
[0020] In the utility model, low-temperature methanol washing purified gas is sent to the first molecular sieve adsorber 1 by the first low-temperature methanol washing purified gas inlet pipeline 7 and is purified after adsorption, and the purified gas obtained is sent to subsequent treatment by the first molecular sieve purified gas outlet pipeline 9, when the adsorption capacity of the first molecular sieve adsorber 1 decreases, the second molecular sieve adsorber 2 is replaced to carry out adsorption and purification, so that normal process is ensured.
[0021] Then, the first molecular sieve adsorber 1 needs to be regenerated, and the existing treatment process of the first molecular sieve adsorber 1 is that low-pressure nitrogen gas is sent to the first molecular sieve adsorber 1 to preheat, and the preheated regeneration nitrogen gas is directly sent to the hydrogen sulfide concentration tower 3 to be used as stripping nitrogen gas. Because H2 and CO gas stored and desorbed in the tank of the first molecular sieve adsorber 1 in the initial preheating stage, with the low-pressure nitrogen gas being sent to the subsequent hydrogen sulfide concentration tower 3 to be stripped, tail gas containing H2 and CO is vented by the tail gas venting pipeline 6, so that a large range of toxic and combustible gas in the chemical production device area frequently alarms.
[0022] This invention, through improvements, adds a replacement process before preheating during the regeneration of the first molecular sieve adsorber 1. Low-pressure nitrogen is used to replace the accumulated H2 and CO-containing gases. Specifically, low-pressure nitrogen is sent to the first molecular sieve adsorber 1 via the first processing pipeline 15, the first connecting pipeline 11, and the first molecular sieve purified gas outlet pipeline 9 for purging. The H2 and CO-containing gases are then purged to the flare via the first low-temperature methanol wash purified gas inlet pipeline 7, the second connecting pipeline 12, the second processing pipeline 16, and the flare outlet pipeline 19 for combustion. This effectively avoids the accumulation and desorbing of H2 and CO in the first molecular sieve adsorber 1 during the initial preheating stage of regeneration, preventing widespread and frequent alarms for toxic and flammable gases in the chemical production area.
[0023] The above-mentioned liquid nitrogen washing molecular sieve regeneration device can be further optimized and / or improved according to actual needs:
[0024] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, an electrically controlled valve 20 is fixedly installed on the flare line 19, and an electrically controlled valve 21 is fixedly installed on the second treatment line 16 between the flare line 19 and the low-pressure nitrogen line 5. The electrically controlled valves 20 and 21 are interlocked.
[0025] In this invention, with this setting, when the replacement time reaches the preset value (replacement ends), the first electrically controlled valve 20 is slowly closed (within the predetermined time). At the same time, the second electrically controlled valve 21 is slowly opened to the predetermined valve position under interlock control. The replacement and preheating process of the molecular sieve can be automatically controlled, which is safe and efficient.
[0026] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, a third connecting pipeline 13 is fixed between the first low-temperature methanol washing and purification gas inlet pipeline 7 and the second low-temperature methanol washing and purification gas inlet pipeline 8 between the second connecting pipeline 12 and the first low-temperature methanol washing and purification gas inlet pipeline 7. A molecular sieve pressure relief pipeline 14 is fixedly connected to the third connecting pipeline 13, and a pressure relief valve 4 is fixedly installed on the molecular sieve pressure relief pipeline 14.
[0027] In this invention, by means of such a setting, the first molecular sieve adsorber 1 is depressurized through the molecular sieve depressurization pipeline 14 before the normal operation of the first molecular sieve adsorber 1 ends and before the regeneration process begins, so as to ensure the safety of the device and equipment.
[0028] Example 4: Its difference from Examples 1 to 4 is as follows: (See attached) Figure 1As shown, the heater 17 is fixedly installed on the first treatment pipeline 15, and the cooler 18 is fixedly installed on the second treatment pipeline 16 between the flare line 19 and the second communication pipeline 12.
[0029] In the utility model, the heater 17 is arranged, low-pressure nitrogen can be heated, and the first molecular sieve adsorber 1 can be regenerated when heated to a predetermined temperature, the cooler 18 is arranged, and the low-pressure nitrogen after regeneration is cooled, and the low-pressure nitrogen after cooling is sent to the concentration tower 3 and used as stripping nitrogen.
[0030] Example 5 differs from examples 1 to 4 in that, as shown in the attached Figure 1 As shown, the hydrogen sulfide concentration tower 3 upper inlet is fixedly communicated with the rich methanol liquid inlet pipeline 22, and the hydrogen sulfide concentration tower 3 bottom outlet is fixedly communicated with the rich methanol liquid outlet pipeline 23.
[0031] In the utility model, through the arrangement, the rich methanol solution containing hydrogen sulfide mixed process gas transported by the upstream CO2 desorption tower is entered into the hydrogen sulfide concentration tower 3 and contacted with the low-pressure nitrogen output in the first molecular sieve adsorber 1 regeneration process in countercurrent, impurity gas is removed, and the obtained rich methanol solution containing hydrogen sulfide process gas is sent to the subsequent heat regeneration tower for heat treatment through the rich methanol liquid outlet pipeline 23.
[0032] According to needs, the pipelines and equipment of the liquid nitrogen washing molecular sieve regeneration device can be additionally provided with conventional valves, thermometers and pressure gauges commonly known in the art and the like according to production needs.
[0033] The above technical features constitute the embodiments of the utility model, have strong adaptability and implementation effect, and can increase or reduce unnecessary technical features according to actual needs to meet the needs of different situations.
[0034] The use process of the utility model embodiment is as follows:
[0035] Normal process:
[0036] The low-temperature methanol washing purified gas is sent to the first molecular sieve adsorber 1 through the first low-temperature methanol washing purified gas inlet pipeline 7 for adsorption purification, and the obtained purified gas is sent to the subsequent cold box for treatment through the first molecular sieve purified gas outlet pipeline 9. Similarly, when the adsorption capacity of the first molecular sieve adsorber 1 decreases, the first molecular sieve adsorber 1 needs to be regenerated, and the low-temperature methanol washing purified gas can be sent to the second molecular sieve adsorber 2 for adsorption purification through the first low-temperature methanol washing purified gas inlet pipeline 7 and the second low-temperature methanol washing purified gas inlet pipeline 8, and the first molecular sieve adsorber 1 and the second molecular sieve adsorber 2 are used alternately, one is regenerated, and the other is adsorbed and purified, so that the normal operation of the process is ensured.
[0037] The first molecular sieve adsorber 1 running for 26 hours is regenerated, and the regeneration process is as follows:
[0038] Pressure relief: the pressure in the first molecular sieve adsorber 1 is relieved through the molecular sieve pressure relief pipeline 14, from 5.2 MPa to 0.4 MPa, and the gas during pressure relief is recovered to the compressor through the molecular sieve pressure relief pipeline 14 or directly vented to the flare system;
[0039] Displacement: the accumulated H2 and CO-containing gas in the first molecular sieve adsorber 1 is displaced, and the displacement process is as follows: the electric control valve one 20 is slowly opened to a predetermined valve position, at the same time, the electric control valve two 21 is slowly closed (for a predetermined period of time), and low-pressure nitrogen gas is sent to the first molecular sieve adsorber 1 through the first treatment pipeline 15, the first communication pipeline 11 and the first molecular sieve purified gas outlet pipeline 9 to displace the accumulated H2 and CO-containing gas in the first molecular sieve adsorber 1 with nitrogen gas, the displacement lasts for 1 hour, and the ventilation volume is about 2000 Nm 3 / h, the low-pressure nitrogen gas containing H2 and CO after displacement is sent to the flare system for burning through the electric control valve 2, after displacement is completed, the electric control valve one 20 is slowly closed (for a predetermined period of time), and at the same time, the electric control valve two 21 is slowly opened to a predetermined valve position;
[0040] Preheating: low-pressure nitrogen gas is sent to the first molecular sieve adsorber 1 through the first treatment pipeline 15, the first communication pipeline 11 and the first molecular sieve purified gas outlet pipeline 9 for preheating, and the first molecular sieve adsorber 1 is warmed from -60°C to about 20°C;
[0041] Heating: low-pressure nitrogen gas is heated through the heater 17, and then sent to the first molecular sieve adsorber 1 through the first treatment pipeline 15, the first communication pipeline 11 and the first molecular sieve purified gas outlet pipeline 9, and the first molecular sieve adsorber 1 is slowly heated to 190°C and maintained at 190°C for two hours;
[0042] Cooling: stop heating of the heater 17, low-pressure nitrogen gas is sent to the first molecular sieve adsorber 1 through the first treatment pipeline 15, the first communication pipeline 11 and the first molecular sieve purified gas outlet pipeline 9, and the first molecular sieve adsorber 1 is cooled from 190°C to about 20°C, at this time, the regeneration of the first molecular sieve adsorber 1 is completed;
[0043] Pressure charging: the pressure in the first molecular sieve adsorber 1 is slowly charged from 0.4 MPa to 5.2 MPa;
[0044] Cooling: low-temperature methanol washing purified gas is sent to the first molecular sieve adsorber 1 through the first low-temperature methanol washing purified gas inlet pipeline 7 for cooling, and is slowly cooled from 20°C to -58°C;
[0045] Wait: Incorporate the first molecular sieve adsorber 1 into the system, and a small amount of low-temperature methanol wash purified gas passes through the first molecular sieve adsorber 1;
[0046] Switch: Wait for the second molecular sieve adsorber 2 to run for 26 hours, and perform molecular sieve switching.
[0047] During the above preheating, heating and cooling processes, the regenerated low-pressure nitrogen gas from the first molecular sieve adsorber 1 passes through the first low-temperature methanol wash purified gas inlet pipeline 7, the second communication pipeline 12 and the second treatment pipeline 16, is cooled in the cooler 18, and then is sent to the hydrogen sulfide concentration tower 3 through the low-pressure nitrogen gas pipeline 5 for stripping, at the same time, the methanol-rich solution containing the hydrogen sulfide mixed process gas delivered by the upstream CO2 desorption tower enters the hydrogen sulfide concentration tower 3 through the methanol-rich liquid inlet pipeline 22, and is in countercurrent contact with the low-pressure nitrogen gas to remove impurity gas, and the obtained methanol-rich solution containing the hydrogen sulfide mixed process gas is sent to the subsequent heat regeneration tower through the methanol-rich liquid outlet pipeline 23 for treatment.
Claims
1. A liquid nitrogen wash molecular sieve regeneration apparatus, characterized by The system includes a first molecular sieve adsorber, a second molecular sieve adsorber, and a hydrogen sulfide concentration tower. A low-pressure nitrogen pipeline is fixedly connected to the lower inlet of the hydrogen sulfide concentration tower, and a tail gas venting pipeline is fixedly connected to the top outlet of the hydrogen sulfide concentration tower. A first low-temperature methanol wash purified gas inlet pipeline is fixedly connected to the bottom inlet of the first molecular sieve adsorber. A second low-temperature methanol wash purified gas inlet pipeline is fixedly connected between the bottom inlet of the second molecular sieve adsorber and the first low-temperature methanol wash purified gas inlet pipeline. A first molecular sieve purified gas outlet pipeline is fixedly connected to the top outlet of the first molecular sieve adsorber, and a second molecular sieve purified gas outlet pipeline is fixedly connected between the top outlet of the second molecular sieve adsorber and the first molecular sieve purified gas outlet pipeline. The first molecular sieve adsorber and the second molecular sieve purified gas outlet... A first connecting pipeline is fixedly connected between the first molecular sieve purified gas outlet pipeline and the second molecular sieve purified gas outlet pipeline. A second connecting pipeline is fixedly connected between the first molecular sieve adsorber and the second low-temperature methanol wash purified gas inlet pipeline. A first processing pipeline is fixedly connected between the first connecting pipeline and the low-pressure nitrogen pipeline. A second processing pipeline is fixedly connected between the first processing pipeline and the low-pressure nitrogen pipeline and the second connecting pipeline between the first processing pipeline and the hydrogen sulfide concentration tower. A heater is fixedly installed on the first processing pipeline. A cooler is fixedly installed on the second processing pipeline. A flare pipeline is fixedly connected between the cooler and the low-pressure nitrogen pipeline on the second processing pipeline.
2. The liquid nitrogen wash molecular sieve regeneration apparatus of claim 1, wherein A first electrically controlled valve is fixedly installed on the flare line, and a second electrically controlled valve is fixedly installed on the second treatment line between the flare line and the low-pressure nitrogen line. The first and second electrically controlled valves are interlocked.
3. The liquid nitrogen wash molecular sieve regeneration apparatus of claim 1 or 2, wherein A third connecting pipeline is fixed between the first low-temperature methanol washing gas inlet pipeline and the second low-temperature methanol washing gas inlet pipeline, and between the second connecting pipeline and the first low-temperature methanol washing gas inlet pipeline. A molecular sieve pressure relief pipeline is fixedly connected to the third connecting pipeline, and a pressure relief valve is fixedly installed on the molecular sieve pressure relief pipeline.
4. The liquid nitrogen wash molecular sieve regeneration apparatus of claim 1 or 2, wherein A heater is fixedly installed on the first processing pipeline, and a cooler is fixedly installed on the second processing pipeline between the flare pipeline and the second connecting pipeline.
5. The liquid nitrogen wash molecular sieve regenerator of claim 3, wherein A heater is fixedly installed on the first processing pipeline, and a cooler is fixedly installed on the second processing pipeline between the flare pipeline and the second connecting pipeline.
6. The liquid nitrogen wash molecular sieve regenerator of claim 1 or 2 or 5, wherein The upper inlet of the hydrogen sulfide concentration tower is fixedly connected to a methanol-rich liquid inlet pipeline, and the bottom outlet of the hydrogen sulfide concentration tower is fixedly connected to a methanol-rich liquid outlet pipeline.
7. The liquid nitrogen wash molecular sieve regenerator of claim 3, wherein The upper inlet of the hydrogen sulfide concentration tower is fixedly connected to a methanol-rich liquid inlet pipeline, and the bottom outlet of the hydrogen sulfide concentration tower is fixedly connected to a methanol-rich liquid outlet pipeline.
8. The liquid nitrogen wash molecular sieve regenerator of claim 4, wherein The upper inlet of the hydrogen sulfide concentration tower is fixedly connected to a methanol-rich liquid inlet pipeline, and the bottom outlet of the hydrogen sulfide concentration tower is fixedly connected to a methanol-rich liquid outlet pipeline.