Liquid nitrogen washing device and ammonia synthesis device

Abstract

The liquid nitrogen washing device comprises an adsorption assembly, an output pipeline and a filtering assembly, a molecular sieve is arranged in the adsorption assembly, the adsorption assembly comprises an exhaust port, the exhaust port is used for discharging a medium used for molecular sieve regeneration, the input end of the output pipeline is communicated with the exhaust port, and the output end of the output pipeline is communicated with the filtering assembly. The output end of the output pipeline is communicated with a methanol washing device, and the filtering assembly is arranged on the output pipeline. The filter assembly is arranged in the output pipeline and can intercept impurities in the output pipeline and guarantee that a medium is smoothly input into the methanol washing device, when a silk screen at the bottom of the molecular sieve is damaged, the filter assembly can intercept the molecular sieve and prevent the molecular sieve from entering the methanol washing device through the output pipeline, and normal work of the methanol washing device is guaranteed. Blockage and overhaul of the heat exchanger are reduced, economic losses caused by overhaul are further reduced, shutdown of the methanol washing device caused by overhaul is avoided, and the working efficiency of the methanol washing device is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of ammonia synthesis, and in particular to a liquid nitrogen washing device and an ammonia synthesis device. Background Art

[0002] The adsorption component of the liquid nitrogen washing device is equipped with a molecular sieve. In the liquid nitrogen washing process, the molecular sieve adsorbs trace amounts of CO2 and CH3OH in the purified gas. When the molecular sieve is in a saturated state, a medium, such as nitrogen, needs to be introduced to participate in the regeneration of the molecular sieve, and the regenerated medium is sent to the methanol washing device for use as gas stripping nitrogen.

[0003] In the related art, a wire mesh is provided at the bottom of the molecular sieve, which can intercept the molecular sieve. When the wire mesh is damaged, the molecular sieve enters the methanol washing device, causing the heat exchanger in the methanol washing device to be blocked. The blocked heat exchanger needs to be repaired, causing economic losses and reducing the working efficiency of the methanol washing device. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention provides a liquid nitrogen washing device.

[0006] A second aspect of the present invention provides an ammonia synthesis plant.

[0007] In view of this, according to the first aspect of the technical solution of the present application, a liquid nitrogen washing device is proposed, which includes: an adsorption component, an output pipeline and a filter component. A molecular sieve is provided in the adsorption component. The adsorption component includes an exhaust port, which is used to discharge the medium after the molecular sieve is regenerated. The input end of the output pipeline is connected to the exhaust port, and the output end of the output pipeline is used to be connected to a methanol washing device. The filter component is arranged in the output pipeline.

[0008] In some technical solutions provided in the present application, optionally, the filter assembly includes: a filter and a pressure differential detection device, the filter is arranged in the output pipeline, the pressure differential detection device is connected in parallel to both ends of the filter, and the pressure differential detection device is used to detect the pressure difference between the input end and the output end of the filter.

[0009] In some technical solutions provided in the present application, optionally, the filter assembly also includes: a ventilation line and a ventilation valve, the inside and the outside of the filter are respectively connected to the two ends of the ventilation line, and the ventilation valve is arranged on the ventilation line.

[0010] In some technical solutions provided in the present application, optionally, the output pipeline also includes: a first pipeline and a second pipeline, the filter assembly is arranged in the first pipeline, the second pipeline is connected in parallel with the first pipeline, and a shut-off valve is arranged on the second pipeline.

[0011] In some technical solutions provided in the present application, optionally, the first pipeline includes: an inlet valve and an outlet valve, the inlet valve is located between the filter component and the adsorption component, and the outlet valve is located between the filter component and the methanol washing device.

[0012] In some technical solutions provided in the present application, optionally, the shut-off valve is a pressure valve, and the pressure collection point of the pressure valve is located in the first pipeline.

[0013] In some technical solutions provided in the present application, optionally, the liquid nitrogen washing device also includes a medium pipeline, the output end of the medium pipeline is arranged on the output pipeline and is located between the adsorption component and the filtration component, the input end of the medium pipeline is used to input the medium, and a first valve is provided on the medium pipeline.

[0014] In some technical solutions provided in the present application, optionally, the number of adsorption components is at least two, and the liquid nitrogen washing device further includes a control device, which is used to control the two adsorption components to operate alternately.

[0015] In some technical solutions provided in the present application, optionally, the liquid nitrogen washing device also includes: a cooler and / or a second valve, the cooler is arranged on the output pipeline and is located between the adsorption component and the filter component, and the second valve is arranged on the output pipeline and is located between the adsorption component and the filter component.

[0016] The second technical solution of the present application provides an ammonia synthesis device, which includes: a methanol washing device and a liquid nitrogen washing device provided by any of the first technical solutions of the present application, and the methanol washing device is connected to the output end of the output pipeline.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] A filter assembly is provided in the output pipeline, which can intercept the debris in the output pipeline and ensure that the medium is smoothly input into the methanol washing device. When the bottom screen of the molecular sieve is damaged, the filter assembly can intercept the molecular sieve to prevent the molecular sieve from entering the methanol washing device through the output pipeline, thereby ensuring the normal operation of the methanol washing device, reducing the blockage and maintenance of the heat exchanger, thereby reducing the economic losses caused by maintenance, avoiding the shutdown of the methanol washing device caused by maintenance, and improving the working efficiency of the methanol washing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1A schematic structural diagram of a liquid nitrogen washing device according to an embodiment of the present application.

[0021] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0022] 10 liquid nitrogen washing device, 100 adsorption component, 200 output pipeline, 210 first pipeline, 211 inlet valve, 212 outlet valve, 220 second pipeline, 221 shut-off valve, 300 filter component, 310 filter, 320 differential pressure detection component, 330 ventilation pipeline, 331 ventilation valve, 400 medium pipeline, 410 first valve, 500 cooler, 600 second valve. DETAILED DESCRIPTION

[0023] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0024] The first embodiment of the present application provides a liquid nitrogen washing device 10, such as Figure 1 As shown, the liquid nitrogen washing device 10 includes: an adsorption component 100, an output pipeline 200 and a filter component 300. A molecular sieve is provided in the adsorption component 100. The adsorption component 100 includes an exhaust port, which is used to discharge the medium after the molecular sieve is regenerated. The input end of the output pipeline 200 is connected to the exhaust port, and the output end of the output pipeline 200 is used to be connected to the methanol washing device. The filter component 300 is arranged on the output pipeline 200.

[0025] In this embodiment, a molecular sieve is provided in the adsorption assembly 100, and the molecular sieve is used to adsorb trace amounts of CO2 and CH3OH in the purified gas. The molecular sieve will enter an adsorption saturation state after being used for a certain period of time, and the adsorption effect will decrease. In this case, a medium needs to be input into the adsorption assembly 100 to purge the molecular sieve with the medium to regenerate the molecular sieve. The medium after the molecular sieve is regenerated is discharged through the exhaust port and enters the output pipeline 200, and the output pipeline 200 transports the medium to the methanol washing device to be used as the gas stripping medium of the methanol washing device.

[0026] A filter assembly 300 is provided in the output pipeline 200. The filter assembly 300 can intercept debris in the output pipeline 200 and ensure that the medium is smoothly input into the methanol washing device. When the bottom screen of the molecular sieve is damaged, the filter assembly 300 can intercept the molecular sieve to prevent the molecular sieve from entering the methanol washing device through the output pipeline 200, thereby ensuring the normal operation of the methanol washing device, reducing blockage and maintenance of the heat exchanger, thereby reducing economic losses caused by maintenance, avoiding shutdown of the methanol washing device caused by maintenance, and improving the working efficiency of the methanol washing device.

[0027] Exemplarily, the medium is nitrogen, and the methanol washing device can be a low-temperature methanol washing hydrogen sulfide regeneration tower.

[0028] In some embodiments provided in this application, Figure 1 As shown, optionally, the filter assembly 300 includes: a filter 310 and a pressure difference detection element 320, the filter 310 is arranged in the output pipeline 200, the pressure difference detection element 320 is connected in parallel to both ends of the filter 310, and the pressure difference detection element 320 is used to detect the pressure difference between the input end and the output end of the filter 310.

[0029] In this embodiment, the filter 310 is disposed in the output pipeline 200 , and a filter screen is disposed inside the filter 310 , and the filter screen can intercept debris inside the filter 310 .

[0030] The two ends of the filter 310 are connected in parallel with a pressure difference detector 320, which can obtain the pressure difference between the two ends of the filter 310, and then grasp the operating status of the filter 310, so as to facilitate the cleaning of the filter 310 and ensure the smooth operation of the filter assembly 300.

[0031] It can be understood that when the pressure difference between the two ends is less than the pressure difference threshold, the pressure difference between the two ends is within the normal range, and the filter 310 is in normal operation. When the pressure difference between the two ends is greater than the pressure difference threshold, the pressure difference between the two ends exceeds the standard, and there is a blockage inside the filter 310, and the filter 310 needs to be cleaned.

[0032] Exemplarily, the pressure difference detection element 320 may be a remote differential pressure gauge. The liquid nitrogen washing device 10 further includes a control device, which is connected to the pressure difference detection element 320. When the pressure difference obtained by the pressure difference detection element 320 is greater than the pressure difference threshold, the control device issues an alarm prompt, which may be provided by a prompt light lighting up or flashing, and / or the control device playing a prompt tone.

[0033] In some embodiments provided in this application, Figure 1 As shown, optionally, the filter assembly 300 further includes: a ventilation line 330 and a ventilation valve 331 , the interior and the exterior of the filter 310 are respectively connected to the two ends of the ventilation line 330 , and the ventilation valve 331 is arranged on the ventilation line 330 .

[0034] In this embodiment, the ventilation line 330 connects the inside and outside of the filter 310, so that the filter 310 can be connected to the outside atmosphere, so as to release the air pressure in the filter 310 and facilitate cleaning of the inside of the filter 310. The ventilation line 330 is provided with a ventilation valve 331, and the connection state of the ventilation line 330 can be controlled by controlling the opening and closing of the ventilation valve 331, thereby improving the controllability of the ventilation line 330.

[0035] Illustratively, before cleaning the filter 310 , the control device first opens the ventilation valve 331 to connect the ventilation line 330 , so that the interior of the filter 310 is connected to the outside atmosphere, and the air pressure inside the filter 310 is released, and the staff cleans the interior of the filter 310 .

[0036] Exemplarily, the material of the ventilation pipe 330 is 304L, the size is DN2, and the pressure level is 150LB.

[0037] In some embodiments provided in this application, Figure 1 As shown, optionally, the output pipeline 200 also includes: a first pipeline 210 and a second pipeline 220 , the filter assembly 300 is disposed in the first pipeline 210 , the second pipeline 220 is connected in parallel with the first pipeline 210 , and a shut-off valve 221 is disposed on the second pipeline 220 .

[0038] In this embodiment, when the operator cleans the filter assembly 300 on the first pipeline 210, or when the filter assembly 300 suddenly fails, the parallel second pipeline 220 can transport the medium to the methanol washing device, so that the output pipeline 200 can continue to transport the medium, ensuring the medium transportation efficiency. The second pipeline 220 is provided with a shut-off valve 221, and the connection state of the second pipeline 220 can be controlled by controlling the opening and closing of the shut-off valve 221, thereby improving the controllability of the second pipeline 220.

[0039] Illustratively, under normal conditions, the shut-off valve 221 is in a closed state. Before cleaning the filter 310 , the control device opens the shut-off valve 221 to connect the second pipeline 220 , and the medium enters the methanol washing device through the second pipeline 220 .

[0040] Exemplarily, when the pressure difference obtained by the pressure difference detection element 320 is greater than the pressure difference threshold, the control device issues an alarm and opens the on-off valve 221 to put the second pipeline 220 in a connected state.

[0041] Exemplarily, the material of the first pipeline 210 and the second pipeline 220 is 304L, the size is DN12, and the pressure level is 150LB.

[0042] In some embodiments provided in this application, Figure 1As shown, optionally, the first pipeline 210 includes: an inlet valve 211 and an outlet valve 212, the inlet valve 211 is located between the filter component 300 and the adsorption component 100, and the outlet valve 212 is located between the filter component 300 and the methanol washing device.

[0043] In this embodiment, the inlet valve 211 and the outlet valve 212 on the first pipeline 210 are respectively located at the two ends of the filter assembly 300, so that when the filter assembly 300 needs to be cleaned or repaired and replaced, the filter assembly 300 is separated from the pipelines at both ends by closing the inlet valve 211 and the outlet valve 212, thereby improving the convenience of cleaning and replacing the filter assembly 300 and preventing the medium in the pipeline from entering the filter assembly 300 and affecting the operator's operation of the filter assembly 300.

[0044] In some embodiments provided in the present application, optionally, the shut-off valve 221 is a pressure valve, and a pressure collection point of the pressure valve is located in the first pipeline 210 .

[0045] In this embodiment, the shut-off valve 221 is a pressure valve, and the pressure valve is controlled by the pressure at the pressure collection point to open and close the state. When the collected pressure is greater than the pressure threshold, the pressure valve is opened, and the second pipeline 220 is in a connected state. When the collected pressure is less than the pressure threshold, the pressure valve is closed, and the second pipeline 220 is in a disconnected state.

[0046] The pressure collection point of the pressure valve is located in the first pipeline 210 to collect the pipeline pressure in the first pipeline 210. When the medium enters the methanol washing device through the first pipeline 210, the pressure valve controls the on-off state of the second pipeline 220 according to the pipeline pressure in the first pipeline 210. When the pressure collected by the pressure valve is less than the pressure threshold, it means that the operation in the first pipeline 210 is normal. The pressure valve controls the second pipeline 220 to be in a closed state to ensure that the medium enters the methanol washing device through the first pipeline 210. When the pressure collected by the pressure valve is greater than the pressure threshold, it means that the operation in the first pipeline 210 is abnormal and there may be a blockage phenomenon. The pressure valve controls the second pipeline 220 to open, so that the medium enters the methanol washing device through the second pipeline 220, and the control device issues an alarm prompt.

[0047] In some embodiments provided in this application, Figure 1 As shown, optionally, the liquid nitrogen washing device 10 also includes a medium pipeline 400, the output end of the medium pipeline 400 is arranged on the output pipeline 200 and is located between the adsorption component 100 and the filter component 300, the input end of the medium pipeline 400 is used to input the medium, and a first valve 410 is provided on the medium pipeline 400.

[0048] In this embodiment, the regeneration process of the molecular sieve is carried out intermittently, and therefore, the regenerated medium is intermittently transported to the methanol washing device. When the regenerated medium stops outputting or the output is insufficient, the medium is replenished into the output pipeline 200 through the medium pipeline 400 and transported between the adsorption component 100 and the filter component 300, so that the medium in the medium pipeline 400 flows through the filter component 300 and enters the methanol washing device to meet the medium demand of the methanol washing device.

[0049] The medium pipeline 400 is provided with a first valve 410 . By controlling the opening and closing of the first valve 410 , the connection state of the medium pipeline 400 can be controlled, thereby improving the controllability of the medium pipeline 400 .

[0050] Exemplarily, the medium management is used to transport low-pressure nitrogen, and the gas pressure of the low-pressure nitrogen is 0.5 MPa.

[0051] In some embodiments provided in the present application, optionally, the number of the adsorption components 100 is at least two, and the liquid nitrogen washing device 10 further includes a control device, which is used to control the two adsorption components 100 to operate alternately.

[0052] In this embodiment, the liquid nitrogen washing device 10 includes at least two adsorption components 100. The control device can control the two adsorption components 100 to operate alternately, so that the two adsorption components 100 are switched for use, that is, when one adsorption component 100 is in an operating state, the other adsorption component 100 is in a regeneration state, so that the adsorption component 100 can perform continuous adsorption work, thereby improving the stability of the working process of the liquid nitrogen washing device 10.

[0053] Exemplarily, the switching cycle of the two adsorption assemblies 100 is 24 hours.

[0054] In some embodiments provided in this application, Figure 1 As shown, optionally, the liquid nitrogen washing device 10 also includes: a cooler 500 and / or a second valve 600, the cooler 500 is arranged on the output pipeline 200 and is located between the adsorption component 100 and the filter component 300, and the second valve 600 is arranged on the output pipeline 200 and is located between the adsorption component 100 and the filter component 300.

[0055] In this embodiment, since the medium needs to be preheated and heated during the auxiliary molecular sieve regeneration, the temperature of the heated medium can reach above 170° C. The cooler 500 cools the medium discharged from the adsorption assembly 100 so that the temperature of the medium can meet the requirements of the methanol washing device and improves the safety of the medium during transportation.

[0056] The output pipeline 200 is provided with a second valve 600 . By controlling the opening and closing of the second valve 600 , the connection state of the output pipeline 200 can be controlled, thereby improving the controllability of the output pipeline 200 .

[0057] A second aspect embodiment of the present application provides an ammonia synthesis device, which includes: a methanol washing device and a liquid nitrogen washing device 10 provided by any one of the first aspect embodiments of the present application, and the methanol washing device is connected to the output end of the output pipeline 200.

[0058] In this embodiment, the medium output by the liquid nitrogen washing device 10 is input into the methanol washing device through the output pipeline 200 to be used as the gas stripping medium of the methanol washing device. It should be noted that the synthetic ammonia device includes the liquid nitrogen washing device 10 provided by any of the above embodiments of the present application, and thus has all the beneficial technical effects of the above liquid nitrogen washing device 10, which will not be described here in detail to avoid repetition.

[0059] In a specific embodiment, the main tasks of the liquid nitrogen washing process are:

[0060] 1. Using a molecular sieve adsorber (i.e., adsorption assembly 100) to adsorb trace amounts of CO2 and CH3OH in the purified gas;

[0061] 2. Use liquid nitrogen to wash and remove CO, CH4, Ar, etc. in the purified gas at low temperature to produce pure gas with CO+CO2<10ppm;

[0062] 3. Add medium-pressure nitrogen to the nitrogen scrubber to prepare a synthesis gas with a hydrogen-nitrogen ratio of 3:1 for ammonia synthesis.

[0063] Regeneration nitrogen is mainly used for the regeneration of molecular sieves. There are two molecular sieve adsorbers, which are switched, that is, one is running and the other is regenerating. The switching cycle is 24 hours and is automatically switched by program control. The low-pressure nitrogen from the air separation unit is regulated and divided into two paths. One of the paths is regulated by a three-way valve and enters the regeneration gas heater, and then enters the molecular sieve adsorber in the reverse direction to regenerate the molecular sieve. The regenerated nitrogen enters the regeneration gas cooler 500 and the second valve 600 through the three-way valve, and is mixed with the other low-pressure nitrogen that does not pass through the molecular sieve, and then sent to the low-temperature methanol washing hydrogen sulfide regeneration tower for use as gas stripping nitrogen.

[0064] The regenerated nitrogen from the liquid nitrogen washing adsorber is sent to the low-temperature methanol washing hydrogen sulfide concentration tower for gas stripping. Table 1 shows the gas stripping nitrogen parameters. When the wire mesh at the bottom of the adsorber is damaged, in order to prevent the molecular sieve from entering the low-temperature methanol washing device and eliminate the hidden danger of heat exchanger blockage, a filter 310 is added to the pipeline of the gas stripping nitrogen outlet.

[0065] Volume flow (Nm3 / h) 7307 Average molecular weight (kg / kmol) 28.013 Density (kg / m3) 3.30 Specific heat (kJ / kgC) 1.039 Thermal conductivity (W / mK) 0.02622 Viscosity (cp) 0.0182 Temperature(℃) 33.2 PressureMpa(a) 0.30 composition (mol%) nitrogen 99.999 oxygen 0.001

[0066] Table 1

[0067] This application is based on the working conditions to professionally design and purchase the filter 310 and formulate an installation plan. The filter 310 is incorporated into the gas lift nitrogen outlet pipeline, and a secondary line shut-off valve (i.e., shut-off valve 221) is added. The shut-off valve is vented and vented with the vent valve 331. The filter 310 is added with a remote differential pressure gauge to completely eliminate the risk of heat exchanger blockage caused by adsorbent entering the low-temperature methanol washing device when the molecular sieve bottom wire mesh is damaged, and eliminate the loss caused by heat exchanger blockage maintenance.

[0068] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0070] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid nitrogen washing device (10), characterized in that: include: An adsorption assembly (100), wherein a molecular sieve is arranged inside the adsorption assembly (100), and the adsorption assembly (100) comprises an exhaust port, wherein the exhaust port is used to discharge a medium after regeneration of the molecular sieve; An output pipeline (200), the input end of the output pipeline (200) being in communication with the exhaust port, and the output end of the output pipeline (200) being in communication with a methanol washing device; The filter assembly (300) is arranged in the output pipeline (200).

2. The liquid nitrogen washing device (10) according to claim 1, characterized in that: The filter assembly (300) comprises: A filter (310) is disposed in the output pipeline (200); A pressure difference detection element (320), the pressure difference detection element (320) is connected in parallel to both ends of the filter (310), and the pressure difference detection element (320) is used to detect the pressure difference between the input end and the output end of the filter (310).

3. The liquid nitrogen washing device (10) according to claim 2, characterized in that: The filter assembly (300) further comprises: A ventilation pipeline (330), wherein the interior and the exterior of the filter (310) are respectively connected to two ends of the ventilation pipeline (330); A ventilation valve (331) is provided on the ventilation pipeline (330).

4. The liquid nitrogen washing device (10) according to claim 1, characterized in that: The output pipeline (200) further comprises: A first pipeline (210), wherein the filter assembly (300) is disposed in the first pipeline (210); The second pipeline (220) is connected in parallel with the first pipeline (210), and a shut-off valve (221) is provided on the second pipeline (220).

5. The liquid nitrogen washing device (10) according to claim 4, characterized in that: The first pipeline (210) comprises: An inlet valve (211) is located between the filter assembly (300) and the adsorption assembly (100); The outlet valve (212) is located between the filter assembly (300) and the methanol washing device.

6. The liquid nitrogen washing device (10) according to claim 4, characterized in that: The shut-off valve (221) is a pressure valve, and the pressure collection point of the pressure valve is located in the first pipeline (210).

7. The liquid nitrogen washing device (10) according to claim 1, characterized in that: Also includes: A medium pipeline (400), wherein the output end of the medium pipeline (400) is arranged on the output pipeline (200) and is located between the adsorption component (100) and the filter component (300), the input end of the medium pipeline (400) is used for inputting medium, and a first valve (410) is provided on the medium pipeline (400).

8. The liquid nitrogen washing device (10) according to any one of claims 1 to 7, characterized in that: The number of the adsorption components (100) is at least two, and the liquid nitrogen washing device (10) further comprises: A control device is used to control the two adsorption components (100) to operate alternately.

9. The liquid nitrogen washing device (10) according to any one of claims 1 to 7, characterized in that: Also includes: a cooler (500), arranged on the output pipeline (200) and located between the adsorption component (100) and the filter component (300); and / or The second valve (600) is arranged on the output pipeline (200) and is located between the adsorption component (100) and the filtering component (300).

10. A synthetic ammonia device, characterized in that: include: The liquid nitrogen washing device (10) according to any one of claims 1 to 9; A methanol washing device is connected to the output end of the output pipeline (200).

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