Molecular sieve dehydration apparatus

Abstract

The utility model belongs to molecular sieve dehydration technical field discloses a molecular sieve dehydration device, include: raw material gas heat exchanger, dry cooling machine and oil remover, the outlet of raw material gas heat exchanger communicates with one end of heat exchange lower connection pipe, the other end of heat exchange lower connection pipe communicates with the inlet of dry cooling machine, the outlet of dry cooling machine communicates with the inlet of oil remover, and the raw material gas heat exchanger communicates with the outlet of oil remover through oil removal upper connection pipe. The molecular sieve dehydration device of the present application is provided with raw material gas heat exchanger before the dry cooling machine, the low-temperature raw material gas of the outlet of the dry cooling machine is used to precool the hot raw material gas entering the dry cooling machine, the cold energy is recovered, the energy consumption of the dry cooling machine is reduced by about 30kw, the low-temperature raw material gas is reheated, the free liquid that is not completely separated is fully gasified, the free water entering the molecular sieve adsorption tower is guaranteed, the molecular sieve is protected from the damage of free water, and the long-period operation of the device is facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of molecular sieve dehydration technology, and specifically relates to a molecular sieve dehydration device. Background Technology

[0002] In the field of industrial gas treatment, especially in gas purification and dehydration processes, effectively removing moisture and impurities from gases has always been an important research direction. Gas dehydration devices, as key equipment in this technological field, directly affect the quality of the gas and the efficiency of subsequent treatment.

[0003] The patent with publication number CN117866678A discloses a molecular sieve dehydration process, which has significant advantages over the traditional molecular sieve dehydration process. It has the advantages of small equipment size, no need for gas injection equipment, and reduced equipment investment. It uses the natural gas stored in the adsorption tower as regeneration gas to achieve self-circulation.

[0004] However, in the aforementioned patent, the raw gas entering the molecular sieve is not treated, i.e., condensed and filtered. Therefore, it cannot be guaranteed that the molecular sieve adsorption tower can efficiently remove moisture and other impurities from the gas after the raw gas enters the molecular sieve adsorption tower. Furthermore, the medium in the raw gas can also damage the molecular sieve, thereby reducing the stability of the molecular sieve adsorption tower and shortening its service life. Utility Model Content

[0005] To address the above problems, this utility model provides a molecular sieve dehydration device, which adopts the following technical solution: A molecular sieve dehydration device includes a raw material gas heat exchanger, a dry cooler, and an oil separator; The outlet of the raw gas heat exchanger is connected to one end of the lower heat exchange connecting pipe, the other end of the lower heat exchange connecting pipe is connected to the inlet of the dry cooler, the outlet of the dry cooler is connected to the inlet of the oil separator, and the raw gas heat exchanger is connected to the outlet of the oil separator through the upper oil separator connecting pipe.

[0006] Furthermore, it also includes a coalescing filter, the inlet of which is connected to one end of the inlet pipe, the other end of which is connected to the upstream gas, the outlet of which is connected to one end of the preheating connection pipe, and the other end of which is connected to the inlet of the raw material gas heat exchanger.

[0007] Furthermore, it also includes a first molecular sieve adsorption tower and a second molecular sieve adsorption tower; The raw material gas heat exchanger is also connected to the inlet of the second molecular sieve adsorption tower via a heat exchange side connecting pipe. One end of the connecting pipe on the molecular sieve is connected to the heat exchange side connecting pipe, and the other end is connected to the inlet of the first molecular sieve adsorption tower. The outlets of the first molecular sieve adsorption tower and the second molecular sieve adsorption tower are both connected to one end of the molecular sieve lower connecting pipe, and the other end of the molecular sieve lower connecting pipe is connected to one end of the molecular sieve output pipe.

[0008] Furthermore, it also includes a filtration system and a heating system, with the other end of the molecular sieve output tube connected in sequence to the filtration system and the heating system; The filtration system includes two parallel filtration units. Each filtration unit includes a lower filter connecting pipe and a dry gas filter. One end of the lower filter connecting pipe of each filtration unit is connected to the molecular sieve output pipe, and the other end is connected to the inlet of the dry gas filter. The outlet of the dry gas filter of each filtration unit is connected to one end of the upper filter connecting pipe, and the other end of the upper filter connecting pipe is connected to the heating system. The heating system includes two parallel regenerated gas compressors and a heater. The inlet of each regenerated gas compressor is connected to one end of the compressor front connecting pipe, and the other end of the compressor front connecting pipe is connected to the filter upper connecting pipe. The outlet of each regenerated gas compressor is connected to one end of the compressor rear connecting pipe, and the other end of the compressor rear connecting pipe is connected to the inlet of the heater.

[0009] Furthermore, it also includes a heating output pipe, the outlet of which is connected to the outlet of the second molecular sieve adsorption tower and the outlet of the first molecular sieve adsorption tower via the heating output pipe.

[0010] Furthermore, it also includes a regeneration connection pipe, a regeneration gas cooler, and a regeneration gas separator; One end of the regeneration connecting pipe is connected to the inlet of the second molecular sieve adsorption tower and the inlet of the first molecular sieve adsorption tower, respectively, and the other end is connected to the regeneration gas cooler and the regeneration gas separator in sequence. The regeneration gas separator is connected to the inlet of the coalescing filter through a circulation pipe.

[0011] Furthermore, it also includes a main sewage pipe, a first sewage pipeline, a second sewage pipeline, a third sewage pipeline, and a fourth sewage pipeline; The filter element drain port of the coalescing filter is connected to the main drain pipe through the first drain pipe, the bottom drain port of the coalescing filter is connected to the main drain pipe through the second drain pipe, the drain port of the oil separator is connected to the main drain pipe through the third drain pipe, the drain port of the regenerated gas separator is connected to the main drain pipe through the fourth drain pipe, and the main drain pipe is connected to the sewage system.

[0012] Furthermore, it also includes the air venting main; The outlet of the coalescing filter is also connected to the venting main, and a first venting valve group is provided between the outlet of the coalescing filter and the venting main; the inlet of the first molecular sieve adsorption tower is connected to the venting main, and a second venting valve group is provided between the inlet of the first molecular sieve adsorption tower and the venting main; the inlet of the second molecular sieve adsorption tower is connected to the venting main, and a third venting valve group is provided between the inlet of the second molecular sieve adsorption tower and the venting main. The dry gas filter outlets of both filter units are connected to the vent main pipe. A fourth vent valve group is provided between the dry gas filter outlet of one filter unit and the vent main pipe, and a fifth vent valve group is provided between the dry gas filter outlet of the other filter unit and the vent main pipe. The outlet of the heater is connected to the vent main, and a sixth vent valve group is provided between the outlet of the heater and the vent main; the vent port of the regenerated gas separator is connected to the vent main, and a seventh vent valve group is provided between the vent port of the regenerated gas separator and the vent main.

[0013] Furthermore, it also includes a bypass line, one end of which is connected to the air inlet pipe and the other end of which is connected to the heat exchange pre-connection pipe.

[0014] Furthermore, a first electric remote control valve is provided on the upper connecting pipe of the molecular sieve, a second electric remote control valve is provided on the heat exchange side connecting pipe, a third electric remote control valve is provided between the outlet of the first molecular sieve adsorption tower and the lower connecting pipe of the molecular sieve, and a fourth electric remote control valve is provided between the outlet of the second molecular sieve adsorption tower and the lower connecting pipe of the molecular sieve.

[0015] The beneficial effects of this utility model are: 1. The molecular sieve dehydration device of this application pre-cools the hot raw material gas entering the refrigerated dryer by adding a raw material gas heat exchanger before the refrigerated dryer, using the low-temperature raw material gas at the outlet of the refrigerated dryer to recover cold energy and reduce the energy consumption of the refrigerated dryer by about 30kw. At the same time, the low-temperature raw material gas is reheated, so that the incompletely separated free liquid is fully vaporized, ensuring that there is no free water entering the molecular sieve adsorption tower, protecting the molecular sieve from damage by free water, and facilitating the long-term operation of the device.

[0016] 2. The optimal process flow design of the molecular sieve dehydration device in this application comprehensively considers the energy consumption of the refrigerated dryer and the regeneration heat load of the molecular sieve adsorption tower. Under the premise of stable and safe operation of the device, the overall energy consumption level of the device is low.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0018] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the connection of the raw gas heat exchanger according to an embodiment of the present invention is shown; Figure 2 A schematic diagram showing the connection between the first molecular sieve adsorption tower and the second molecular sieve adsorption tower according to an embodiment of the present invention is shown. Figure 3 A connection diagram of a filtration system according to an embodiment of the present invention is shown; Figure 4 A connection diagram of the heating system and the regenerated gas separator according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the working process of a molecular sieve dewatering device according to an embodiment of the present invention is shown.

[0020] In the diagram: 101. Coalescing filter; 102. Inlet pipe; 103. Pre-heat exchanger connecting pipe; 104. Raw material gas heat exchanger; 105. Lower heat exchanger connecting pipe; 106. Dry cooler; 107. Oil separator; 108. Upper oil separator connecting pipe; 109. Heat exchanger side connecting pipe; 110. Upper molecular sieve connecting pipe; 111. First molecular sieve adsorption tower; 112. Lower molecular sieve connecting pipe; 113. Molecular sieve output pipe; 114. Lower filter connecting pipe; 115. Dry gas filter; 116. Upper filter connecting pipe; 117. Compressor pre-connecting pipe; 118. Regenerated gas compressor; 119. Compressor post-connecting pipe; 120. Heater; 121. Heater output pipe; 122. Second molecular sieve adsorption tower; 123. Regeneration connecting pipe; 124. Regenerated gas cooler; 125. Regenerated gas separator; 126. Circulation. Pipeline; 201, First differential pressure transmitter; 202, Second differential pressure transmitter; 203, First temperature transmitter; 204, Second temperature transmitter; 205, Third temperature transmitter; 206, Fourth temperature transmitter; 207, First electric remote control valve; 208, Second electric remote control valve; 209, Third electric remote control valve; 210, Fourth electric remote control valve; 301, Vent main pipe; 302, First vent valve assembly; 303, Second vent valve assembly; 304, Third vent valve assembly; 305, Fourth vent valve assembly; 306, Fifth vent valve assembly; 307, Sixth vent valve assembly; 308, Seventh vent valve assembly; 309, Bypass line; 310, First sewage discharge line; 311, Second sewage discharge line; 312, Third sewage discharge line; 313, Fourth sewage discharge line; 314, Sewage main pipe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0023] This invention provides a molecular sieve dehydration device, which solves the problems of insufficient gasification of the medium in the raw material gas and reduced energy consumption in the prior art.

[0024] like Figure 1 As shown, a molecular sieve dehydration device includes a coalescing filter 101, a raw gas heat exchanger 104, a dry cooler 106, and an oil separator 107.

[0025] The coalescing filter 101 has its inlet connected to one end of the inlet pipe 102, and the other end of the inlet pipe 102 is connected to the upstream gas. The raw material gas enters the coalescing filter 101 through the inlet pipe 102. The outlet of the coalescing filter 101 is connected to one end of the heat exchanger connection pipe 103, and the other end of the heat exchanger connection pipe 103 is connected to the inlet of the raw material gas heat exchanger 104. The outlet of the raw material gas heat exchanger 104 is connected to one end of the heat exchanger lower connection pipe 105, and the other end of the heat exchanger lower connection pipe 105 is connected to the inlet of the dry cooler 106. The outlet of the dry cooler 106 is connected to the inlet of the oil separator 107 through a pipe. The raw material gas heat exchanger 104 is connected to the outlet of the oil separator 107 through the oil separator upper connection pipe 108.

[0026] For example, a manual on / off valve is installed on the inlet pipe 102 to control the inlet gas flow rate. Oil, water, and solid impurities are removed by the coalescing filter 101. The filtered gas enters the raw material gas heat exchanger 104 for pre-cooling, and then enters the dry cooler 106 for shallow cooling. The shallowly cooled gas enters the oil separator 107 to remove solid impurities and liquid mist particles.

[0027] In this embodiment, a raw gas heat exchanger 104 is installed before the dry cooler 106 to pre-cool the filtered raw gas. This pre-cooling process lowers the gas temperature before it enters the main processing unit, reducing moisture and impurities and improving subsequent processing efficiency. The gas then enters the dry cooler 106 for further cooling to a lower temperature, more effectively removing moisture or other volatile components. During this process, the temperature drop typically causes moisture in the gas to condense, making it easier to remove.

[0028] This application adds a raw material gas heat exchanger 104 before the dry cooler 106, using the low-temperature raw material gas at the outlet of the dry cooler 106 to pre-cool the hot raw material gas entering the dry cooler 106, recovering cold energy and reducing the energy consumption of the dry cooler 106 by about 30 kW. At the same time, the low-temperature raw material gas is reheated, so that the incompletely separated free liquid is fully vaporized, ensuring that there is no free water entering the molecular sieve adsorption tower, protecting the molecular sieve from damage by free water, and facilitating long-term operation of the device.

[0029] like Figure 2As shown, the molecular sieve dehydration device also includes a first molecular sieve adsorption tower 111 and a second molecular sieve adsorption tower 122. The raw material gas heat exchanger 104 is also connected to the inlet of the second molecular sieve adsorption tower 122 through a heat exchange side connecting pipe 109. One end of the molecular sieve upper connecting pipe 110 is connected to the heat exchange side connecting pipe 109, and the other end is connected to the inlet of the first molecular sieve adsorption tower 111.

[0030] The outlets of the first molecular sieve adsorption tower 111 and the second molecular sieve adsorption tower 122 are both connected to one end of the molecular sieve lower connecting pipe 112, and the other end of the molecular sieve lower connecting pipe 112 is connected to one end of the molecular sieve output pipe 113.

[0031] The treated gas is fed into the second molecular sieve adsorption tower 122 through the heat exchange side connecting pipe 109, or into the first molecular sieve adsorption tower 111 through the molecular sieve upper connecting pipe 110 for adsorption and dehydration, and then transported out through the first molecular sieve lower connecting pipe 112 (second molecular sieve lower connecting pipe 112) and the molecular sieve output pipe 113.

[0032] This application employs a two-tower operation process, where the first tower (111) and the second tower (122) are respectively the first molecular sieve adsorption tower and the second molecular sieve adsorption tower. The first tower is used for the adsorption process, including feed gas treatment and gas pretreatment, while the second tower is used for the regeneration process, including regeneration gas treatment and regeneration. In actual operation, the first and second towers are continuously switched according to the needs of adsorption and regeneration. When the first tower is performing adsorption, the second tower is regenerating; conversely, when the second tower is performing adsorption, the first tower is regenerating. This switching operation ensures the continuous and stable operation of the device and improves the gas dehydration and purification efficiency.

[0033] like Figure 2 As shown, for example, a first differential pressure transmitter 201 is installed between the inlet and outlet of the first molecular sieve adsorption tower 111, and a second differential pressure transmitter 202 is installed between the inlet and outlet of the second molecular sieve adsorption tower 122. By installing inlet and outlet differential pressure transmitters in the first and second towers, the changes in the inlet and outlet differential pressure of the equipment are detected. When the differential pressure reaches 30 kPa, the system alarms (to prevent excessive blockage of the adsorbent).

[0034] like Figure 2 As shown, for example, a first temperature transmitter 203 (TT) is installed at the inlet of the first molecular sieve adsorption tower 111, a second temperature transmitter 204 (TT) is installed at the outlet of the first molecular sieve adsorption tower 111, a third temperature transmitter 205 (TT) is installed at the inlet of the second molecular sieve adsorption tower 122, and a fourth temperature transmitter 206 (TT) is installed at the outlet of the second molecular sieve adsorption tower 122.

[0035] Temperature transmitters are installed at the inlet and outlet of both tower 1 and tower 2. During adsorption, the system alarms when the inlet temperature is ≥50℃, and during regeneration, the system alarms when the outlet temperature is ≥210℃. During regeneration, the system alarms when the hot blowing temperature is ≤220℃ and the cold blowing temperature is ≥40℃.

[0036] like Figure 2 As shown, for example, a first electric remote control valve 207 (KV) is provided on the upper connecting pipe 110 of the molecular sieve, a second electric remote control valve 208 (KV) is provided on the heat exchange side connecting pipe 109, a third electric remote control valve 209 (KV) is provided between the outlet of the first molecular sieve adsorption tower 111 and the lower connecting pipe 112 of the molecular sieve, and a fourth electric remote control valve 210 (KV) is provided between the outlet of the second molecular sieve adsorption tower 122 and the lower connecting pipe 112 of the molecular sieve.

[0037] In this embodiment, an electric remote control valve is installed in the inlet and outlet adsorption process pipelines of the first and second towers. When the first molecular sieve adsorption tower 111 is in the adsorption process, the first electric remote control valve 207 and the third electric remote control valve 209 are opened, and the second electric remote control valve 208 and the fourth electric remote control valve 210 are closed.

[0038] During the regeneration process of the two towers, the second electric remote control valve 208 and the fourth electric remote control valve 210 are opened, while the first electric remote control valve 207 and the third electric remote control valve 209 are closed, ensuring that the adsorption of the first tower and the regeneration process of the second tower proceed normally.

[0039] like Figure 3 and Figure 4 As shown, for example, the molecular sieve dewatering device also includes a filtration system and a heating system, and the other end of the molecular sieve output pipe 113 is connected to the filtration system and the heating system in sequence.

[0040] like Figure 3 As shown, for example, the filtration system includes two parallel filtration units. Each filtration unit includes a lower filter connecting pipe 114 and a dry gas filter 115. One end of the lower filter connecting pipe 114 of each filtration unit is connected to the molecular sieve output pipe 113, and the other end is connected to the inlet of the dry gas filter 115. The outlet of the dry gas filter 115 of each filtration unit is connected to one end of the upper filter connecting pipe 116, and the other end of the upper filter connecting pipe 116 is connected to the heating system.

[0041] In this embodiment, the molecular sieve output pipe 113 inputs gas into the dry gas filter 115 of each filter unit through the filter lower connecting pipe 114. The dry gas filter 115 filters out impurities such as molecular sieve dust. Two filter units are configured, one in operation and one on standby. The clean gas after being processed by the dry gas filter 115 of the filter unit flows out of the device outlet and enters the next processing flow.

[0042] like Figure 4 As shown, for example, the heating system includes two parallel regenerated gas compressors 118 and a heater 120. The inlet of each regenerated gas compressor 118 is connected to one end of the compressor front connecting pipe 117, the other end of the compressor front connecting pipe 117 is connected to the filter upper connecting pipe 116, the outlet of each regenerated gas compressor 118 is connected to one end of the compressor rear connecting pipe 119, and the other end of the compressor rear connecting pipe 119 is connected to the inlet of the heater 120.

[0043] In this embodiment of the application, the dried and purified regenerated gas enters the regenerated gas compressor 118 through the compressor front connecting pipe 117 for pressurization. There are two regenerated gas compressors 118, one working and one on standby.

[0044] For example, an electric remote control valve is installed before the bypass line of the regeneration gas compressor 118. When regeneration is required, the electric remote control valve is opened, and when regeneration is finished, the electric remote control valve is closed.

[0045] For example, an emergency shut-off valve is installed on the lower connecting pipe 114 of the filter. When the temperature of the raw gas after adsorption from the adsorption tower is greater than or equal to 65°C, the emergency shut-off valve is closed to protect the downstream process.

[0046] For example, the filter connecting pipe 116 is also connected to an external compressor. The dry gas in the filter connecting pipe 116 is delivered to the external compressor. Three temperature transmitters (TT) and one electric remote control valve (KV) are installed between the filter connecting pipe 116 and the inlet of the external compressor. By setting three temperature transmitters (TT), 2oo3 (two out of three), the temperature measurement of the dry gas after it exits the dry gas filter 115 is accurate. When the temperature is greater than or equal to 42℃, the system alarms. When the temperature is ≥65℃, the system closes the electric remote control valve (KV).

[0047] like Figure 2 , Figure 3 and Figure 4 As shown, for example, the molecular sieve dehydration device also includes a heating output pipe 121, and the outlet of the heater 120 is connected to the outlet of the second molecular sieve adsorption tower 122 and the outlet of the first molecular sieve adsorption tower 111 through the heating output pipe 121.

[0048] like Figure 2 , Figure 3 and Figure 4 As shown, for example, the molecular sieve dehydration device also includes a regeneration connecting pipe 123, a regeneration gas cooler 124, and a regeneration gas separator 125. One end of the regeneration connecting pipe 123 is connected to the inlet of the second molecular sieve adsorption tower 122 and the inlet of the first molecular sieve adsorption tower 111, respectively, and the other end is connected to the regeneration gas cooler 124 and the regeneration gas separator 125 in sequence. The regeneration gas separator 125 is connected to the inlet of the coalescing filter 101 through the circulation pipe 126.

[0049] For example, the molecular sieve dewatering device also includes a main drain pipe 314, a first drain line 310, a second drain line 311, a third drain line 312, and a fourth drain line 313.

[0050] The filter element drain port of the coalescing filter 101 is connected to the main drain pipe 314 via the first drain pipe 310, the bottom drain port of the coalescing filter 101 is connected to the main drain pipe 314 via the second drain pipe 311, the drain port of the oil separator 107 is connected to the main drain pipe 314 via the third drain pipe 312, the drain port of the regenerated gas separator 125 is connected to the main drain pipe 314 via the fourth drain pipe 313, and the main drain pipe 314 is connected to the sewage system.

[0051] The pressurized regenerated gas is fed into heater 120 via compressor connection pipe 119 for heating. After heating, it is fed into the inlet of coalescing filter 101 via circulation pipe 126, and then passes sequentially through raw material gas heat exchanger 104, dry cooler 106, and oil separator 107 before entering the first molecular sieve adsorption tower 111 or the second molecular sieve adsorption tower 122 in the regeneration process. The heated regenerated gas enters the water-saturated second tower from bottom to top, carrying away the adsorbed moisture in the molecular sieve. When the temperature of the regenerated gas at the top outlet of the first molecular sieve adsorption tower 111 or the second molecular sieve adsorption tower 122 reaches the set value, the regeneration process is complete. After flowing out from the top of the tower, the regenerated gas enters regenerated gas cooler 124 for cooling. The cooled regenerated gas passes through regenerated gas separator 125 to separate moisture and other impurities. The separated regenerated gas flows into the inlet of coalescing filter 101 via circulation pipe 126 and enters the first tower together with the raw material gas for adsorption treatment. The impurities at the separation point enter the main sewage pipe 314 via the fourth sewage pipe 313 and then flow into the sewage system.

[0052] For example, an electric remote control valve is installed between the heating output pipe 121 and the outlet of the second molecular sieve adsorption tower 122 and the outlet of the first molecular sieve adsorption tower 111, and an electric remote control valve (KV) is installed between the regeneration connection pipe 123 and the inlet of the second molecular sieve adsorption tower 122 and the inlet of the first molecular sieve adsorption tower 111.

[0053] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, for example, the molecular sieve dewatering device also includes a vent manifold 301, wherein the outlet of the coalescing filter 101 is also connected to the vent manifold 301, and a first vent valve group 302 is provided between the outlet of the coalescing filter 101 and the vent manifold 301; the inlet of the first molecular sieve adsorption tower 111 is connected to the vent manifold 301, and a second vent valve group 303 is provided between the inlet of the first molecular sieve adsorption tower 111 and the vent manifold 301; the inlet of the second molecular sieve adsorption tower 122 is connected to the vent manifold 301, and a third vent valve group 304 is provided between the inlet of the second molecular sieve adsorption tower 122 and the vent manifold 301.

[0054] The outlets of the dry gas filters 115 of both filter units are connected to the vent manifold 301. A fourth vent valve group 305 is provided between the outlet of the dry gas filter 115 of one filter unit and the vent manifold 301, and a fifth vent valve group 306 is provided between the outlet of the dry gas filter 115 of the other filter unit and the vent manifold 301.

[0055] The outlet of heater 120 is connected to the vent main 301, and a sixth vent valve group 307 is provided between the outlet of heater 120 and the vent main 301; the vent port of regenerated gas separator 125 is connected to the vent main 301, and a seventh vent valve group 308 is provided between the vent port of regenerated gas separator 125 and the vent main 301.

[0056] like Figure 1 As shown, for example, the molecular sieve dehydration device also includes a bypass line 309, one end of which is connected to the air inlet pipe 102 and the other end is connected to the heat exchange pre-connection pipe 103.

[0057] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, valves are provided on the heat exchanger connection pipe 103, the filter connection pipe 116, the compressor connection pipe 117, the circulation pipe 126, the main drain pipe 314, the first drain pipe 310, the second drain pipe 311, the third drain pipe 312, the fourth drain pipe 313, and the bypass pipe 309.

[0058] like Figure 5 As shown, the working principle of the molecular sieve dehydration device of this application is as follows: a two-tower operation process is adopted, with one tower for adsorption and the other tower for regeneration.

[0059] Adsorption process: The raw gas enters through the inlet pipe 102, which is equipped with a manual switch valve to shut off the incoming gas. After entering, the raw gas first passes through the coalescing filter 101 for filtration, removing most of the oil, water, and solid impurities. The filtered raw gas stream then passes through the raw gas heat exchanger 104 for pre-cooling, and then enters the dry cooler 106 for shallow cooling. The shallowly cooled gas then enters the high-efficiency oil separator 107 to remove solid impurities and free liquid mist particles (oil and water) entrained in the gas. It then enters the first molecular sieve adsorption tower 111 from top to bottom, i.e., the first tower, and flows through the molecular sieve adsorption layer for adsorption and dehydration. The adsorbed gas flows out from the bottom of the first molecular sieve adsorption tower 111 and enters the dry gas filter 115 of a filtration unit to filter out impurities such as molecular sieve dust entrained in the gas. The clean gas after being treated by the dry gas filter 115 flows out through the outlet of the dry gas filter 115 to enter the next processing step.

[0060] Regeneration Process: The first molecular sieve adsorption tower 111 dries the gas while the second molecular sieve adsorption tower 122 performs regeneration. A portion of the dried and purified gas is used in the regeneration process. The dried and purified regeneration gas is pressurized by one of the regeneration gas compressors 118. The pressurized regeneration gas is then heated by a heater 120 (electrically heated). The heated regeneration gas enters the water-saturated second tower from bottom to top, carrying away the moisture adsorbed in the second molecular sieve adsorption tower 122. The regeneration process is complete when the temperature of the regeneration gas at the top outlet of the adsorption tower reaches the set temperature. After flowing out of the second molecular sieve adsorption tower 122, the regeneration gas enters the regeneration gas cooler 124 for cooling. The cooled regeneration gas then flows through the regeneration gas separator 125, separating some moisture and other impurities. The separated regeneration gas flows into the inlet pipe 102 and enters the first tower together with the raw material gas for adsorption and drying.

[0061] During regeneration, heater 120 operates for approximately 3-4 hours. When heater 120 is operating, the inlet temperature is ≤42℃ and the outlet temperature is ≥220℃. This period is called hot blowing. After hot blowing ends, heater 120 stops operating, and the regeneration process continues. This process is called cold blowing, and the cold blowing temperature is ≤40℃.

[0062] In the main process described above, the first and second towers are constantly switching according to the needs of adsorption and regeneration. When the first tower is adsorbing, the second tower is regenerating, and vice versa.

[0063] This application selects the optimal process flow design, comprehensively considering the energy consumption of the dry cooler 106 and the regeneration heat load of the adsorption tower. Under the premise of stable and safe operation of the device, the overall energy consumption level of the device is low.

[0064] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A molecular sieve dewatering device, characterized in that, It includes a raw gas heat exchanger (104), a dry cooler (106), and an oil separator (107); The outlet of the raw gas heat exchanger (104) is connected to one end of the lower heat exchange connecting pipe (105), the other end of the lower heat exchange connecting pipe (105) is connected to the inlet of the dry cooler (106), the outlet of the dry cooler (106) is connected to the inlet of the oil separator (107), and the raw gas heat exchanger (104) is connected to the outlet of the oil separator (107) through the upper oil separator connecting pipe (108). It also includes a coalescing filter (101), the inlet of which is connected to one end of an air inlet pipe (102), the other end of which is connected to upstream gas, the outlet of which is connected to one end of a heat exchanger connecting pipe (103), and the other end of which is connected to the inlet of the raw material gas heat exchanger (104). It also includes a first molecular sieve adsorption tower (111) and a second molecular sieve adsorption tower (122); wherein, the raw material gas heat exchanger (104) is also connected to the inlet of the second molecular sieve adsorption tower (122) through a heat exchange side connecting pipe (109), one end of the molecular sieve connecting pipe (110) is connected to the heat exchange side connecting pipe (109), and the other end is connected to the inlet of the first molecular sieve adsorption tower (111); The outlet of the first molecular sieve adsorption tower (111) and the outlet of the second molecular sieve adsorption tower (122) are both connected to one end of the molecular sieve lower connecting pipe (112), and the other end of the molecular sieve lower connecting pipe (112) is connected to one end of the molecular sieve output pipe (113).

2. The molecular sieve dehydration device of claim 1, wherein, It also includes a filtration system and a heating system, with the other end of the molecular sieve output pipe (113) connected in sequence to the filtration system and the heating system; The filtration system includes two parallel filtration units. Each filtration unit includes a lower filter connecting pipe (114) and a dry gas filter (115). One end of the lower filter connecting pipe (114) of each filtration unit is connected to the molecular sieve output pipe (113), and the other end is connected to the inlet of the dry gas filter (115). The outlet of the dry gas filter (115) of each filtration unit is connected to one end of the upper filter connecting pipe (116), and the other end of the upper filter connecting pipe (116) is connected to the heating system. The heating system includes two parallel regenerated gas compressors (118) and a heater (120). The inlet of each regenerated gas compressor (118) is connected to one end of the compressor front connecting pipe (117), and the other end of the compressor front connecting pipe (117) is connected to the filter upper connecting pipe (116). The outlet of each regenerated gas compressor (118) is connected to one end of the compressor rear connecting pipe (119), and the other end of the compressor rear connecting pipe (119) is connected to the inlet of the heater (120).

3. The molecular sieve dewatering device according to claim 2, characterized in that, It also includes a heating output pipe (121), through which the outlet of the heater (120) is connected to the outlet of the second molecular sieve adsorption tower (122) and the outlet of the first molecular sieve adsorption tower (111).

4. The molecular sieve dewatering device according to claim 3, characterized in that, It also includes a regeneration connection pipe (123), a regeneration gas cooler (124), and a regeneration gas separator (125); One end of the regeneration connecting pipe (123) is connected to the inlet of the second molecular sieve adsorption tower (122) and the inlet of the first molecular sieve adsorption tower (111), respectively, and the other end is connected to the regeneration gas cooler (124) and the regeneration gas separator (125) in sequence. The regeneration gas separator (125) is connected to the inlet of the coalescing filter (101) through the circulation pipe (126).

5. The molecular sieve dewatering device according to claim 4, characterized in that, It also includes the main sewage pipe (314), the first sewage pipeline (310), the second sewage pipeline (311), the third sewage pipeline (312) and the fourth sewage pipeline (313); The filter element drain port of the coalescing filter (101) is connected to the main drain pipe (314) through the first drain line (310), the bottom drain port of the coalescing filter (101) is connected to the main drain pipe (314) through the second drain line (311), the drain port of the oil separator (107) is connected to the main drain pipe (314) through the third drain line (312), the drain port of the regenerated gas separator (125) is connected to the main drain pipe (314) through the fourth drain line (313), and the main drain pipe (314) is connected to the sewage system.

6. The molecular sieve dehydration device of claim 4, wherein, It also includes the vent manifold (301); The outlet of the coalescing filter (101) is also connected to the venting manifold (301), and a first venting valve group (302) is provided between the outlet of the coalescing filter (101) and the venting manifold (301); the inlet of the first molecular sieve adsorption tower (111) is connected to the venting manifold (301), and a second venting valve group (303) is provided between the inlet of the first molecular sieve adsorption tower (111) and the venting manifold (301); the inlet of the second molecular sieve adsorption tower (122) is connected to the venting manifold (301), and a third venting valve group (304) is provided between the inlet of the second molecular sieve adsorption tower (122) and the venting manifold (301). The outlets of the dry gas filters (115) of both filter units are connected to the vent manifold (301). A fourth vent valve assembly (305) is provided between the outlet of the dry gas filter (115) of one filter unit and the vent manifold (301), and a fifth vent valve assembly (306) is provided between the outlet of the dry gas filter (115) of the other filter unit and the vent manifold (301). The outlet of the heater (120) is connected to the vent manifold (301), and a sixth vent valve group (307) is provided between the outlet of the heater (120) and the vent manifold (301); the vent port of the regenerated gas separator (125) is connected to the vent manifold (301), and a seventh vent valve group (308) is provided between the vent port of the regenerated gas separator (125) and the vent manifold (301).

7. The molecular sieve dewatering device according to any one of claims 1-6, characterized in that, It also includes a bypass line (309), one end of which is connected to the air inlet pipe (102) and the other end is connected to the heat exchange pre-connection pipe (103).

8. The molecular sieve dewatering device according to any one of claims 1-6, characterized in that, A first electric remote control valve (207) is provided on the upper connecting pipe (110) of the molecular sieve, a second electric remote control valve (208) is provided on the heat exchange side connecting pipe (109), a third electric remote control valve (209) is provided between the outlet of the first molecular sieve adsorption tower (111) and the lower connecting pipe (112) of the molecular sieve, and a fourth electric remote control valve (210) is provided between the outlet of the second molecular sieve adsorption tower (122) and the lower connecting pipe (112) of the molecular sieve.

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