Feed gas purification device and production system

Abstract

The utility model provides a feed gas purification device and a production system, the feed gas purification device comprises at least four purification units capable of alternately performing adsorption, cooling and heating procedures, at the same time, two purification units are two adsorption towers for executing the adsorption procedure, one purification unit is a cooling tower for executing the cooling procedure, and the other purification unit is a cooling tower for executing the heating procedure. Wherein the other purification unit is a heating tower for executing a heating process. On the basis, the raw material gas purification device reduces the type selection size of the purification unit and the adsorbent filling amount, and also reduces the overall investment and operation energy consumption of equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical industry, in particular to a raw gas purification device and a production system. BACKGROUND

[0002] Liquefied natural gas usually contains heavy hydrocarbon substances. If the heavy hydrocarbon substances are not separated in advance, the heavy hydrocarbon substances are easy to be condensed and block the equipment during the transportation of the liquefied natural gas. Therefore, in order to ensure the normal operation of the natural gas liquefaction system, the heavy hydrocarbon substances in the natural gas must be removed before the natural gas enters the cold box.

[0003] In the natural gas heavy hydrocarbon removal system of the related art, the overall investment and the operation energy consumption of the heavy hydrocarbon removal device are large, and there is room for improvement. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to provide a raw gas purification device and a production system, the raw gas purification device can adsorb the heavy hydrocarbon substances in the raw gas and realize the purification of the raw gas, and the equipment investment and the operation energy consumption of the entire raw gas purification device are small.

[0005] In order to solve the above problems, in the first aspect, the present application provides a raw gas purification device, which comprises at least four purification units that can alternately perform adsorption, cooling and heating processes, at the same time, two of the purification units are two adsorption towers that perform the adsorption process, one of the purification units is a cooling tower that performs the cooling process, and the other of the purification units is a heating tower that performs the heating process.

[0006] Optionally, the raw gas purification device further comprises a regenerated gas heating unit, a regenerated gas cooling unit and a separation unit.

[0007] At the same time, the two adsorption towers and the cooling tower are in communication with a raw gas conveying pipeline, the outlet of the cooling tower is in communication with the regenerated gas heating unit, the regenerated gas heating unit is in communication with the heating tower, the heating tower is in communication with the regenerated gas cooling unit, and the regenerated gas cooling unit is connected with the separation unit.

[0008] Optionally, the raw gas purification device further comprises a regenerated gas heating unit, a regenerated gas cooling unit, a separation unit, a first input pipeline, a second input pipeline, a third input pipeline, a first output pipeline, a second output pipeline and a third output pipeline; wherein,

[0009] The first input pipeline is in communication with raw gas, the first input pipeline is in communication with the first pipelines of the at least four purification units through different valve control units, the first output pipeline is in communication with the second pipelines of the at least four purification units through different valve control units, and the first output pipeline is used for discharging the raw gas after being adsorbed.

[0010] The second input pipe is connected to the raw material gas, and is connected to the first pipes of the at least four purification units through different valve control units. The second output pipe is connected to the second pipes of the at least four purification units through different valve control units, and is connected to the regenerative gas heating unit.

[0011] The third input pipe is connected to the regenerative gas heating unit and is connected to the second pipes of the at least four purification units through different valve control units. The third output pipe is connected to the first pipes of the at least four purification units through different valve control units, and is connected to the regenerative gas cooling unit. The regenerative gas cooling unit is connected to the separation unit.

[0012] Optionally, the raw material gas purification device further comprises a flow regulating unit, which is connected to the first input pipe and the second input pipe respectively. The flow regulating unit is used to make the flow of the raw material gas entering the first input pipe greater than the flow of the raw material gas entering the second input pipe.

[0013] Optionally, the raw material gas purification device further comprises a heat recovery unit, which is connected to the second output pipe, the regenerative gas heating unit, the third output pipe, and the regenerative gas cooling unit respectively.

[0014] Optionally, the raw material gas purification device further comprises a temperature control valve unit. When the temperature of the gas transported by the second output pipe is lower than a temperature threshold, the temperature control valve unit is used to conduct the second output pipe, the heat recovery unit, and the regenerative gas heating unit. When the temperature of the gas transported by the second output pipe is not lower than the temperature threshold, the temperature control valve unit is used to conduct the second output pipe and the regenerative gas heating unit.

[0015] Optionally, the separation unit is further connected to the first input pipe.

[0016] Optionally, the separation unit comprises a heat exchanger and a gas-liquid separator. The first inlet of the heat exchanger is used to input a refrigerant, and the first outlet of the heat exchanger is used to discharge the refrigerant. The second inlet of the heat exchanger is connected to the regenerative gas cooling unit. The second outlet of the heat exchanger is connected to the inlet of the gas-liquid separator. The gas outlet of the gas-liquid separator is connected to the first input pipe. The liquid outlet of the gas-liquid separator is connected to the third inlet of the heat exchanger. The third outlet of the heat exchanger is used to discharge the adsorbed impurities.

[0017] Optionally, the raw gas purification device further comprises a filtering unit, an inlet of the filtering unit is communicated with the second pipeline of each purification unit, and an outlet of the filtering unit is used for discharging the raw gas after being adsorbed.

[0018] Optionally, the raw gas comprises natural gas, and the adsorption tower is used for adsorbing heavy hydrocarbon substances.

[0019] In a second aspect, the application further provides a production system comprising a production device and the raw gas purification device as described above, wherein the production device is used for providing the raw gas.

[0020] Based on the above technical solution, the raw gas purification device provided by the application is provided with at least four purification units which can alternately perform the adsorption, cooling and heating processes, and the raw gas purification device can continuously and uninterruptedly realize the purification of the raw gas, and the purification efficiency is higher. Moreover, the application provides a scheme in which two purification units are used as two adsorption towers to simultaneously perform the impurity adsorption. Compared with the scheme in the related art in which one adsorption tower is used to perform the impurity adsorption, under the premise of realizing the same adsorption effect and quantifying the adsorbent, the application can design two adsorption towers with smaller volumes to perform the adsorption, and the loading amount of the adsorbent in each adsorption tower of the application is much smaller than the loading amount of the adsorbent in the adsorption tower designed in the related scheme. Moreover, the flow of the raw gas entering the two adsorption towers of the application at the same time is larger than the flow of the raw gas entering the adsorption tower in the related scheme, and the adsorption efficiency of the two adsorption towers of the application is higher. Furthermore, the volumes of the heating tower and the cooling tower matched with the adsorption tower of the application are also smaller, and the energy consumption consumed in the execution of the heating process and the cooling process is also smaller. Based on this, the overall investment and energy consumption of the four smaller purification units of the application are much smaller than those of the scheme in the related art in which one adsorption tower is used to perform the adsorption, and the raw gas purification device of the application reduces the selection size of the purification unit and the loading amount of the adsorbent, and also reduces the overall investment and operation energy consumption of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] In order to more completely understand the application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0023] Figure 1 A structural schematic diagram of the raw gas purification device provided by the embodiments of the application;

[0024] Figure 2A timing control schematic diagram of the raw material gas purification device provided by the embodiment of the present application;

[0025] Figure 3 An adsorption path schematic diagram of the raw material gas purification device of the embodiment of the present application;

[0026] Figure 4 A flow path schematic diagram of the regeneration gas of the raw material gas purification device of the embodiment of the present application;

[0027] Figure 5 A structure schematic diagram of the production system provided by the embodiment of the present application.

[0028] The reference signs are represented as:

[0029] 10, production system; 100, raw material gas purification device; 200, production device; 110, first purification unit; 120, second purification unit; 130, third purification unit; 140, fourth purification unit; 150, regeneration gas heating unit; 160, regeneration gas cooling unit; 170, separation unit; 180, heat recovery unit; 190, filtration unit; 171, heat exchanger; 172, gas-liquid separator; L0, raw material gas conveying pipeline; L1, first input pipeline; L2, second input pipeline; L3, third input pipeline; L4, first output pipeline; L5, second output pipeline; L6, third output pipeline; L7, regeneration gas circulating pipeline; KV0, flow regulating unit; KV1-KV4, first valve control unit; KV5-KV8, second valve control unit; KV9-KV12, third valve control unit; KV13-KV16, fourth valve control unit; KV17-KV20, fifth valve control unit; KV21-KV24, sixth valve control unit. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings of the present application to Figure 1 to Figure 5 and embodiments, the technical solutions in the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] In this paper, the phrase "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be contained in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in this paper can be combined with other embodiments.

[0032] In the field of liquefied natural gas, heavy hydrocarbon substances generally refer to hydrocarbons with a carbon number of 5 or more. Since the boiling point of a hydrocarbon changes from low to high as its molecular weight changes from small to large, heavy hydrocarbon substances are always condensed first in the liquefied natural gas process and are easy to block equipment. At present, the methods for removing heavy hydrocarbons from natural gas include adsorption, absorption, and condensation separation. Among them, the adsorption method removes heavy hydrocarbons in natural gas by using the principle of solid adsorption. The adsorption tower is filled with adsorbent, natural gas enters the adsorption tower, and heavy hydrocarbon substances are adsorbed by the adsorbent, while light hydrocarbon components pass through the adsorbent layer and flow out from the top of the adsorption tower to enter the subsequent processing process. When the adsorbent is saturated, a regeneration process such as heating and cooling is required to restore the activity of the adsorbent.

[0033] The advantage of the adsorption method for removing heavy hydrocarbons is that the device is simple, the heavy hydrocarbon removal rate is high, and the water in the natural gas can also be removed, and the heavy hydrocarbon content after purification can be reduced to below 10 ppm. However, the adsorption heavy hydrocarbon removal scheme of the related technology is limited by the saturated adsorption capacity of the solid adsorbent. For natural gas with high heavy hydrocarbon content, a large amount of adsorbent needs to be filled, and correspondingly, the adsorption heavy hydrocarbon removal corresponds to a large volume of adsorption tower, cooling tower, and heating tower. The overall equipment occupies a large space, the energy consumption of the equipment operation is large, and the overall investment of the equipment is large.

[0034] To solve the above technical problems, the present application provides a raw gas purification device 100 and a production system 10. The following will be described in detail in combination with specific embodiments. It should be noted that the embodiments of the present application can be presented in various forms, and some examples will be described below.

[0035] Please refer to Figure 1 , Figure 1 A structural schematic diagram of the raw gas purification device 100 provided by the embodiments of the present application is shown. The raw gas purification device 100 includes at least four purification units that can alternately perform adsorption, cooling, and heating processes. At the same time, two of the purification units are two adsorption towers that perform the adsorption process, one of the purification units is a cooling tower that performs the cooling process, and the other purification unit is a heating tower that performs the heating process.

[0036] It can be understood that each purification unit is filled with an adsorbent. The adsorbent can be, but is not limited to, activated carbon or a mixture of activated carbon and molecular sieve. The adsorbent can adsorb heavy hydrocarbons and other impurities in the raw gas. Of course, as the types of impurities in the raw gas vary, the types of the adsorbent can also vary. For example, when removing water from natural gas, the adsorbent can also be, but is not limited to, silica gel, activated alumina, etc. The structure of the adsorbent is not limited in the embodiments of the present application.

[0037] It can be understood that each purification unit can be of the same structure. That is, the adsorption tower, the cooling tower and the heating tower can be of the same structure, and each tower can realize the adsorption process of the adsorbent, the heating process of the adsorbent and the cooling process of the adsorbent. Among them, the purpose of the adsorption process is to adsorb impurities such as heavy hydrocarbon impurities in the raw gas to purify the raw gas. The purpose of the heating process is to heat and desorb the impurities such as heavy hydrocarbon adsorbed by the adsorbent, and the desorbed impurities can be discharged and collected. The cooling process is to cool the adsorbent to ensure the activity of the adsorbent, so as to prepare for the adsorption process of the adsorbent again.

[0038] It can be understood that, as shown in Figure 1 , the raw gas purification device 100 includes four purification units as an example to illustrate the purification process of the raw gas. The raw gas purification device 100 includes a first purification unit 110, a second purification unit 120, a third purification unit 130 and a fourth purification unit 140. In the purification process of the raw gas, two purification units in the raw gas purification device 100, for example, the first purification unit 110 and the fourth purification unit 140, perform the adsorption process and form two adsorption towers, one purification unit, for example, the third purification unit 130, performs the heating process and forms one heating tower, and one purification unit, for example, the second purification unit 120, performs the cooling process and forms one cooling tower. When the two adsorption towers complete the adsorption, one of the adsorption towers can continue to adsorb, the original cooling tower can perform the adsorption process and become a new adsorption tower, and the original heating tower can perform the cooling process and become a new cooling tower, and so on, so that the raw gas purification device 100 of the embodiment of the application realizes the uninterrupted circulation of the adsorption, heating and cooling processes through the four purification units.

[0039] For example, please refer to Figure 2 , Figure 2A timing control schematic diagram of the raw gas purification device 100 provided by the embodiment of the present application is shown in the figure. In the first time period, the first purification unit 110 and the fourth purification unit 140 are adsorption towers and perform the adsorption process, the third purification unit 130 is a heating tower and performs the heating process, and the second purification unit 120 is a cooling tower and performs the cooling process. In the second time period, the first purification unit 110 and the second purification unit 120 are adsorption towers and perform the adsorption process, the fourth purification unit 140 is a heating tower and performs the heating process, and the third purification unit 130 is a cooling tower and performs the cooling process. In the third time period, the second purification unit 120 and the third purification unit 130 are adsorption towers and perform the adsorption process, the first purification unit 110 is a heating tower and performs the heating process, and the fourth purification unit 140 is a cooling tower and performs the cooling process. In the fourth time period, the third purification unit 130 and the fourth purification unit 140 are adsorption towers and perform the adsorption process, the second purification unit 120 is a heating tower and performs the heating process, and the first purification unit 110 is a cooling tower and performs the cooling process. The T1 time period to the T4 time period are one purification cycle, and the cycle is repeated subsequently.

[0040] It should be noted that the raw gas of the embodiment of the present application can include natural gas, the adsorption tower is used for adsorbing heavy hydrocarbon substances, and the raw gas purification device 100 is used for performing the adsorption and heavy hydrocarbon removal operation on the natural gas. Of course, the raw gas of the embodiment of the present application can also be used for adsorption and purification of laboratory waste gas. The raw gas of the embodiment of the present application is not limited.

[0041] The raw gas purification device 100 of the embodiment of the present application is provided with at least four purification units that can alternately perform the adsorption, cooling and heating processes, and the raw gas purification device 100 can continuously and uninterruptedly realize the purification of the raw gas, and the purification efficiency is higher. Moreover, the embodiment of the present application provides a scheme that two purification units are used as two adsorption towers to simultaneously perform the impurity adsorption, compared with the scheme that one adsorption tower is used to perform the impurity adsorption in the related art, under the premise that the same amount of adsorbent is used to achieve the same adsorption effect, the two adsorption towers used in the present application have a smaller volume, the loading amount of the adsorbent in each adsorption tower of the present application is much smaller than the loading amount of the adsorbent in the adsorption tower designed in the related scheme; moreover, the flow rate of the raw gas entering the two adsorption towers of the present application is larger than the flow rate of the raw gas entering the adsorption tower in the related scheme, and the adsorption efficiency of the two adsorption towers of the present application is higher; furthermore, the heating tower and the cooling tower matched with the adsorption tower of the present application also have a smaller volume, and the energy consumption consumed for performing the heating process and the cooling process is also smaller. Based on this, the overall investment and energy consumption of the four smaller purification units of the present application are much smaller than the scheme that one larger adsorption tower is used to perform the adsorption in the related art, and the raw gas purification device 100 of the present application reduces the selection size of the purification unit and the loading amount of the adsorbent, and also reduces the overall investment and operation energy consumption of the equipment.

[0042] Wherein, please refer to Figure 1 , the raw material gas purification device 100 further comprises a regeneration gas heating unit 150, a regeneration gas cooling unit 160 and a separation unit 170. At the same time, two adsorption towers and a cooling tower are in communication with the raw material gas delivery pipeline L0, the outlet of the cooling tower is in communication with the regeneration gas heating unit 150, the regeneration gas heating unit 150 is in communication with a heating tower, the heating tower is in communication with the regeneration gas cooling unit 160, and the regeneration gas cooling unit 160 is connected with the separation unit 170.

[0043] It can be understood that the regeneration gas heating unit 150 can be but is not limited to a heavy hydrocarbon removal regeneration gas heater. The regeneration gas heating unit 150 is used to heat the regeneration gas to achieve the heating of the heating tower, and the heat source in the regeneration gas heating unit 150 can be but is not limited to heat conducting oil, steam, electric heating, etc. The regeneration gas cooling unit 160 can be but is not limited to a heavy hydrocarbon removal regeneration gas cooler. The regeneration gas cooling unit 160 is used to cool the regeneration gas to achieve the cooling of the cooling tower, and the cold source of the regeneration gas cooling unit 160 can be but is not limited to circulating water, air cold source, chilled water, etc. The separation unit 170 is used to separate impurities such as but not limited to heavy hydrocarbons from the regeneration gas, thereby achieving the purification operation of the raw material gas.

[0044] It can be understood that, as shown in Figure 3 , Figure 3 is a schematic diagram of the adsorption path of the raw material gas purification device 100 of the embodiment of the present application. Both of the two adsorption towers are in communication with the raw material gas, and most of the raw material gas delivered by the raw material gas delivery pipeline L0 enters the adsorption tower from the first pipeline (i.e. the inlet of the adsorption tower) at the top of the two adsorption towers (e.g. the first purification unit 110 and the fourth purification unit 140) to perform the adsorption process, and then is discharged from the second pipeline (i.e. the outlet of the adsorption tower) at the bottom of the adsorption tower and recovered. In some examples, as shown in Figure 3 , the raw material gas purification device 100 further comprises a filtering unit 190, which can be but is not limited to a mercury removal dust filtering unit, and the filtering unit 190 is used to filter and remove impurities such as mercury and dust from the adsorbed raw material gas. The second pipeline of the adsorption tower is in communication with the filtering unit 190, and the adsorbed raw material gas is discharged and collected after being filtered by the filtering unit 190. Thus, the raw material gas delivery pipeline L0, the adsorption tower and the filtering unit 190 jointly form the adsorption path of the raw material gas.

[0045] It can be understood that, as shown in Figure 4 , Figure 4A flow path of the regeneration gas of the raw material gas purification device 100 is shown in the figure. The regeneration gas refers to the gas that is used to heat the adsorbent or catalyst to remove moisture, impurities or to restore the activity. In the present application, the cooling tower (for example, the second purification unit 120) is in communication with the raw material gas delivery pipeline L0, and a small portion of the raw material gas delivered by the raw material gas delivery pipeline L0 enters the cooling tower from the first pipeline (i.e., the inlet of the cooling tower) at the top of the cooling tower as the regeneration gas for cooling and cooling to a certain temperature (for example, but not limited to, 40℃); the cooled regeneration gas flows out of the second pipeline (i.e., the outlet of the cooling tower) of the cooling tower and flows through the regeneration gas heating unit 150 to be heated to another temperature (for example, but not limited to, 260℃); the heated regeneration gas enters the heating tower (for example, the third purification unit 130) from the second pipeline at the bottom of the heating tower and heats and regenerates the adsorbent in the heating tower, so that the heavy hydrocarbons adsorbed by the adsorbent are heated and desorbed and flow with the regeneration gas; the regeneration gas carrying the heavy hydrocarbons flows into the separation unit 170 and the heavy hydrocarbons are condensed and separated and discharged. Thus, the raw material gas delivery pipeline L0, the cooling tower, the regeneration gas heating unit 150, the heating tower, and the separation unit 170 together form a regeneration gas flow path.

[0046] It can be understood that the present application can make most of the raw material gas enter the adsorption path, and a small portion of the raw material gas enter the regeneration gas flow path. For example, about 85% of the raw material gas enters the adsorption path, and about 15% of the raw material gas enters the regeneration gas flow path. The present application utilizes a portion of the raw material gas as the regeneration gas, thereby reducing the cost of the regeneration gas.

[0047] In the present application, the raw material gas purification device 100 includes a plurality of purification units, and each purification unit includes a cooling tower, a heating tower, and a separation unit. Figures 1 to 4 In order to enable each purification unit to cyclically perform the adsorption, cooling, and heating processes, the raw material gas purification device 100 of the present application further includes a first input pipeline L1, a second input pipeline L2, a third input pipeline L3, a first output pipeline L4, a second output pipeline L5, a third output pipeline L6, and a plurality of valve control units.

[0048] The first input pipe L1 is connected to the raw material gas, and is connected to the raw material gas delivery pipe L0. The first input pipe L1 is connected to the first pipes of the at least four purification units through different valve control units (e.g. first valve control units), and the first output pipe L4 is connected to the second pipes of the at least four purification units through different valve control units (e.g. second valve control units), and the first output pipe L4 is used to discharge the raw material gas after being adsorbed. When the raw material gas purification device 100 includes a filter unit 190, the first output pipe L4 is connected to the filter unit 190 so that the inlet of the filter unit 190 is connected to the second pipes of each purification unit, and the outlet of the filter unit 190 is used to discharge the raw material gas after being adsorbed. The first input pipe L1, the first pipes of each purification unit, each purification unit, the second pipes of each purification unit, the first output pipe L4, and the filter unit 190 form an adsorption path.

[0049] The second input pipe L2 is connected to the raw material gas, and a small part of the raw material gas is used as a regeneration gas. The second input pipe L2 is connected to the raw material gas delivery pipe L0. The second input pipe L2 is connected to the first pipes of the at least four purification units through different valve control units (e.g. third valve control units), and the second output pipe L5 is connected to the second pipes of the at least four purification units through different valve control units (e.g. fourth valve control units), and the second output pipe L5 is connected to the regeneration gas heating unit 150.

[0050] The third input pipe L3 is connected to the regeneration gas heating unit 150 and is connected to the second pipes of the at least four purification units through different valve control units (e.g. fifth valve control units), and the third output pipe L6 is connected to the first pipes of the at least four purification units through different valve control units (e.g. sixth valve control units), and the third output pipe L6 is connected to the regeneration gas cooling unit 160, and the regeneration gas cooling unit 160 is connected to the separation unit 170.

[0051] It can be understood that the second input pipe L2, the first pipes of each purification unit, each purification unit, the second pipes of each purification unit, the second output pipe L5, and the regeneration gas heating unit 150 form a cooling path in the regeneration gas flow path, and the regeneration gas heating unit 150 heats the cooled regeneration gas. The regeneration gas heating unit 150, the third input pipe L3, the second pipes of each purification unit, each purification unit, the first pipes of each purification unit, the third output pipe L6, the regeneration gas cooling unit 160, and the separation unit 170 form a heating and separation path in the regeneration gas flow path.

[0052] It can be understood that the first input pipeline L1, the second input pipeline L2, the third input pipeline L3, the first output pipeline L4, the second output pipeline L5 or the third output pipeline L6 are not limited to a single pipe, but can be connected by multiple pipes.

[0053] It can be understood that the number of the first valve control unit to the sixth valve control unit is equal to the number of the purification units. For example, in the embodiment of the present application, four first valve control units KV1, KV2, KV3 and KV4, four second valve control units KV5, KV6, KV7 and KV8, four third valve control units KV9, KV10, KV11 and KV12, four fourth valve control units KV13, KV14, KV15 and KV16, four fifth valve control units KV17, KV18, KV19 and KV20, and four sixth valve control units KV21, KV22, KV23 and KV24 are included. Among them, the first valve control unit to the sixth valve control unit can be, but are not limited to, program-controlled valves.

[0054] The embodiment of the present application connects four purification units through three input pipelines and three output pipelines, and through the control of multiple valve control units, the four purification units can be alternately cycled to perform the adsorption, cooling and heating processes. The raw gas purification device 100 has simple structure and layout, and is more suitable for industrial production.

[0055] Among them, please refer to Figures 1 to 4 The raw gas purification device 100 further includes a flow regulating unit KV0, which is in communication with the first input pipeline L1 and the second input pipeline L2 respectively. The flow regulating unit KV0 is used to make the flow of raw gas entering the first input pipeline L1 greater than the flow of raw gas entering the second input pipeline L2.

[0056] It can be understood that the flow regulating unit KV0 can be, but is not limited to, a flow regulating valve. The flow regulating unit KV0 can deliver about 85% of the raw gas to the first input pipeline L1, which is delivered by the first input pipeline L1 to two purification units performing the adsorption process at this time for adsorption. The flow regulating unit KV0 can deliver about 15% of the raw gas as regeneration gas to the second input pipeline L2, which is delivered by the second input pipeline L2 to one purification unit performing the cooling process at this time for regeneration gas circulation.

[0057] The flow regulating valve of the embodiment of the present application delivers most of the raw gas to the first input pipeline L1 for adsorption, and delivers a small part of the raw gas to the second input pipeline L2 as regeneration gas. The scheme of the present application can not only ensure the adsorption efficiency of the raw gas, but also reuse the raw gas as regeneration gas, thereby saving the cost of regeneration gas.

[0058] Among them, please refer to Figures 1 to 4The raw material gas purification device 100 further comprises a heat recovery unit 180. The heat recovery unit 180 is in communication with the second output pipeline L5, the regenerated gas heating unit 150, the third output pipeline L6, and the regenerated gas cooling unit 160, respectively.

[0059] It can be understood that the heat recovery unit 180 can include, but is not limited to, a heat recovery heat exchanger. The heat recovery heat exchanger mainly recovers waste heat based on heat conduction, heat convection, heat radiation, and the like. The heat recovery unit 180 can collect the heat of the regenerated gas after being heated by the heating tower output by the third output pipeline L6, and can heat the regenerated gas after being cooled by the cooling tower output from the second output pipeline L5.

[0060] The heat recovery unit 180 of the embodiment of the present application can collect the heat of the regenerated gas with high temperature and heat the regenerated gas with low temperature. The insufficient heat after heating is reused by the regenerated gas heating unit 150. The heat recovery unit 180 and the regenerated gas heating unit 150 cooperate with each other, thereby reducing the operating energy consumption of the raw material gas purification device 100. At the same time, part of the heat of the regenerated gas after being heated and flowing out of the third output pipeline L6 is recovered by the heat recovery unit 180. When the regenerated gas is cooled in the regenerated gas cooling unit 160, the amount of the cold source of the regenerated gas cooling unit 160 required is small, thereby further reducing the operating energy consumption of the raw material gas purification device 100.

[0061] Here, please refer to Figures 1 to 4 The raw material gas purification device 100 further comprises a temperature control valve unit (not shown in the figure). The temperature control valve unit is used to conduct the second output pipeline L5, the heat recovery unit 180, and the regenerated gas heating unit 150 when the temperature of the gas transported by the second output pipeline L5 is lower than a temperature threshold. The temperature control valve unit is also used to conduct the second output pipeline L5 and the regenerated gas heating unit 150 when the temperature of the gas transported by the second output pipeline L5 is not lower than the temperature threshold.

[0062] It can be understood that the temperature threshold can be set according to the temperature of the regenerated gas output by the third output pipeline L6 and entering the heat recovery unit 180. For example, the temperature threshold can be equal to or less than the average temperature of the regenerated gas output by the third output pipeline L6 and entering the heat recovery unit 180.

[0063] Understandably, the regenerated gas output from the second output pipe L5 after the cooling tower has two paths depending on its temperature, and the temperature control valve unit can select different paths based on the temperature of the regenerated gas. When the regenerated gas after being cooled and supplied from the second output pipe L5 is lower than the temperature threshold of the regenerated gas after being heated, the cooled regenerated gas passes through the temperature control valve unit and enters the heat recovery unit 180 for heat exchange, and then enters the regenerated gas heating unit 150 for heating (to 260°C). When the regenerated gas after being cooled and supplied from the second output pipe L5 is higher than the temperature threshold of the regenerated gas after being heated, the cooled regenerated gas directly enters the regenerated gas heating unit 150 for heating (to 260°C) after being cooled and supplied from the temperature control valve unit.

[0064] In this embodiment, the regenerated gas after being cold-blown from the cooling tower can be heated by the regenerated gas heating unit 150 after passing through the heat recovery unit 180 under the control of the temperature control valve unit, thereby reducing the operating energy consumption of the regenerated gas heating unit 150; alternatively, it can be directly heated by the regenerated gas heating unit 150, thereby improving the heating efficiency of the regenerated gas. Thus, the solution of this application can balance the low heating energy consumption and high heating efficiency of the regenerated gas.

[0065] Please refer to this again. Figure 4 In this embodiment, the separation unit 170 is also connected to the first input pipe L1, so that the regenerated gas after being discharged from the separation unit 170 after adsorbing impurities (such as heavy hydrocarbons) can return to the first input pipe L1 and enter the adsorption tower along with most of the raw material gas for adsorption. Thus, the solution of this embodiment can achieve both the circulation of regenerated gas and the purification of all raw material gas.

[0066] It is understood that the raw material gas purification device 100 in this embodiment may further include a regeneration gas circulation pipe L7, through which the separation unit 170 is connected to the first input pipe L1. In some examples, the inlet of the regeneration gas circulation pipe L7 may be connected between the raw material gas delivery pipe L0 and the flow regulating unit KV0, so that the gas separated from the separation unit 170 merges with the raw material gas delivered by the raw material gas delivery pipe L0 via the regeneration gas circulation pipe L7, and then enters the first input pipe L1 and the second input pipe L2 under the distribution of the flow regulating unit KV0.

[0067] Please refer to this again. Figure 4The separation unit 170 of the embodiment of the present application comprises a heat exchanger 171 and a gas-liquid separator 172. The first inlet of the heat exchanger 171 is used for inputting the refrigerant, and the first outlet of the heat exchanger 171 is used for discharging the refrigerant. The second inlet of the heat exchanger 171 is communicated with the regenerated gas cooling unit 160, the second outlet of the heat exchanger 171 is communicated with the inlet of the gas-liquid separator 172, the gas outlet of the gas-liquid separator 172 is communicated with the first input pipeline L1, the liquid outlet of the gas-liquid separator 172 is communicated with the third inlet of the heat exchanger 171, and the third outlet of the heat exchanger 171 is used for discharging the adsorbed impurities.

[0068] It can be understood that the heat exchanger 171 can be but is not limited to a heavy hydrocarbon removal low-temperature heat exchanger. In some examples, the heat exchanger 171 can be a plate-fin heat exchanger. The gas-liquid separator 172 can be but is not limited to a heavy hydrocarbon removal regenerated gas separator. In which, the regenerated gas transported from the heating tower enters the heat exchanger 171 from the second inlet of the heat exchanger 171 after passing through the regenerated gas cooling unit 160, and exchanges heat with the refrigerant in the heat exchanger 171 to be cooled, for example, to 5-35°C (the temperature is adjusted according to the accuracy of heavy hydrocarbon removal). Subsequently, it is discharged from the second outlet of the heat exchanger 171 and enters the gas-liquid separator 172 from the inlet of the gas-liquid separator 172 for gas-liquid separation. The separated liquid phase heavy hydrocarbon and other impurities enter the third inlet of the heat exchanger 171 from the liquid outlet of the gas-liquid separator 172, re-enter the heat exchanger 171, are reheated, and are then sent to the outside from the third outlet of the heat exchanger 171. The separated gas is communicated with the first input pipeline L1 from the gas outlet of the gas-liquid separator 172, is combined with most of the raw material gas, and enters the adsorption tower for adsorption.

[0069] It can be understood that the first inlet and the first outlet of the heat exchanger 171 form a refrigerant inlet and outlet circulation path. The refrigerant can be a liquid phase refrigerant. The refrigerant uses the mixed refrigerant in the liquefaction working device. The present application can realize the heat exchange process of the heavy hydrocarbon removal low-temperature heat exchanger 171 by using the existing cold source and heat exchange process of the liquefaction plant.

[0070] Based on the structure of the raw material gas purification device 100 described above, the process flow of the heavy hydrocarbon removal of the raw material gas purification device 100 in a time sequence is specifically described as follows:

[0071] Most of the raw material gas (about 85% of the raw material gas) transported by the raw material gas transportation pipeline L0 enters the adsorption tower from the first pipeline (i.e., the inlet of the adsorption tower) at the top of the two adsorption towers (e.g., the first purification unit 110 and the fourth purification unit 140) after passing through the flow regulation unit KV0 and being directly controlled by the first valve control unit, for adsorption and heavy hydrocarbon removal. Subsequently, the gas after heavy hydrocarbon removal is discharged from the second pipeline (i.e., the outlet of the adsorption tower) at the bottom of the adsorption tower, enters the filter unit 190 after passing through the second valve control unit, is filtered to remove dust, and is then sent to the outside.

[0072] The other part of the raw material gas (about 85% of the raw material gas) conveyed by the raw material gas conveying pipeline L0 is blown and cooled by about 40℃ as the regenerated gas from the first pipeline (i.e. the inlet of the cooling tower) at the top of the cooling tower (for example, the second purification unit 120) after passing through the flow regulating unit KV0, and enters the cooling tower. The cooled regenerated gas flows out from the second pipeline (i.e. the outlet of the cooling tower) of the cooling tower and passes through the fourth valve control unit to flow through the regenerated gas heating unit 150 to be heated to about 260℃; when the temperature of the cooled regenerated gas is lower than the temperature of the subsequent hot blown regenerated gas, the cooled regenerated gas enters the heat recovery unit 180 after heat exchange with the hot blown regenerated gas through the temperature control valve unit, and then enters the regenerated gas heating unit 150 to be heated to about 260℃. The heated regenerated gas enters the heating tower (for example, the third purification unit 130) from the second pipeline at the bottom of the heating tower through the fifth valve control unit, and heats and regenerates the adsorbent in the heating tower, so that the heavy hydrocarbons adsorbed by the adsorbent are desorbed and flow with the regenerated gas; the regenerated gas carrying heavy hydrocarbons enters the heat recovery unit 180 and the regenerated gas cooling unit 160 once through the sixth valve control unit to be cooled to about 40℃, and then enters the de-heavy hydrocarbon low-temperature heat exchanger 171 to be cooled to 5-35℃ (the temperature is adjusted according to the de-heavy hydrocarbon accuracy) after heat exchange with the liquid phase coolant from the liquefaction plant, and then enters the de-gas liquid separator 172 for gas-liquid separation. The separated liquid phase heavy hydrocarbons are returned to the de-heavy hydrocarbon low-temperature heat exchanger 171 after pressure reduction by the regulating valve, reheated and sent to the outside. The separated gas is reheated in the de-heavy hydrocarbon low-temperature heat exchanger 171, returned to the flow regulating unit KV0 at the inlet of the raw material gas purification device 100 after reheating, combined with the main road gas, and sent to the two adsorption towers in the adsorption state through the first valve control unit for adsorption.

[0073] Based on the above-mentioned raw material gas purification device 100, the present application also provides a production system 10, please refer to Figure 5 , Figure 5 A structural schematic diagram of the production system 10 provided by the embodiment of the present application. The production system 10 comprises the raw material gas purification device 100 in any of the above-mentioned embodiments and a production device 200 for conveying raw material gas to the raw material gas purification device 100.

[0074] Based on the above-mentioned raw material gas purification device 100 and the production system 10, the embodiment of the present application has the following advantages:

[0075] 1. The present application provides a four-tower adsorption de-heavy hydrocarbon scheme, which aims to solve the problem that when processing large amount of adsorption de-heavy hydrocarbon natural gas, the number of valve control units of four towers arranged by two-tower simultaneous adsorption, one-tower hot blowing and one-tower cold blowing is 24, which reduces the selection size of each tower and the amount of adsorbent in the raw material gas purification device 100, and reduces the investment and operating energy consumption of the device.

[0076] 2、The application sets up a heat recovery heat exchange unit to recover heat, uses the heated regenerated gas to heat the cooled regenerated gas, and heats the insufficient heat by using the regenerated gas heating unit 150, thereby reducing the operation energy consumption of the entire device.

[0077] 3、The application can use the existing cold source and heat exchange process of the liquefaction plant to realize the heat exchange process of the heavy hydrocarbon removal low-temperature heat exchanger 171. The cold source uses mixed refrigerant in the liquefaction device, the refrigerant uses liquid-phase refrigerant, the source position of the liquid-phase refrigerant is selected according to the depth of heavy hydrocarbon removal, and the liquid-phase refrigerant is used to exchange heat with the regenerated gas and heavy hydrocarbon in the heavy hydrocarbon removal low-temperature heat exchanger 171. While using the existing cold source, more cold energy is recovered as much as possible to reduce the energy consumption of the device; at the same time, the device refrigerant and the independently designed heavy hydrocarbon removal regenerated gas cooling process are used to replace the cold dryer to reduce the investment of the device.

[0078] It should be noted that the "multiple" mentioned in the application generally refers to two or more. Moreover, the direction terms mentioned in the embodiments of the application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side" and the like, are only the directions of the reference drawings. Therefore, the direction terms used are used to illustrate and understand the embodiments of the application, and not to limit the embodiments of the application. In each drawing, similar units are denoted by the same reference numerals. For the sake of clarity, each part in the drawing is not drawn to scale. In addition, some related parts may not be shown in the drawing.

[0079] It should be understood that in the description of the application, terms such as "first", "second" and the like are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0080] It can be understood that those skilled in the art can combine various embodiments in each of the above embodiments under the guidance of the above embodiments to obtain technical solutions of various embodiments. The above description is only the preferred embodiment of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

[0081] The raw material gas purification device and production system provided by the application are described in detail above. Specific examples are applied in this paper to describe the principles and implementation modes of the application. The above embodiment is only used to help understand the application. Meanwhile, for those skilled in the art, the specific implementation mode and application range will be changed according to the idea of the application. In conclusion, the content of the specification should not be understood as a limitation of the application.

Claims

1. A raw material gas purifying apparatus characterized by comprising: The raw gas purification device comprises at least four purification units which can alternately perform adsorption, cooling and heating processes, at the same time, two of the purification units are adsorption towers which perform adsorption process, one of the purification units is a cooling tower which performs cooling process, and the other of the purification units is a heating tower which performs heating process.

2. The raw gas cleaning device according to claim 1, characterized in that The raw gas purification device further comprises a regenerated gas heating unit, a regenerated gas cooling unit and a separation unit; At the same time, the two adsorption towers and the cooling tower are connected with a raw gas conveying pipeline, the outlet of the cooling tower is connected with the regenerated gas heating unit, the regenerated gas heating unit is connected with the heating tower, the heating tower is connected with the regenerated gas cooling unit, and the regenerated gas cooling unit is connected with the separation unit.

3. The raw gas cleaning device according to claim 1, characterized in that The raw gas purification device further comprises a regenerated gas heating unit, a regenerated gas cooling unit, a separation unit, a first input pipeline, a second input pipeline, a third input pipeline, a first output pipeline, a second output pipeline and a third output pipeline; wherein, The first input pipeline is connected with raw gas, the first input pipeline is connected with the first pipelines of the at least four purification units through different valve control units, the first output pipeline is connected with the second pipelines of the at least four purification units through different valve control units, and the first output pipeline is used for discharging raw gas after adsorption; The second input pipeline is connected with raw gas, the second input pipeline is connected with the first pipelines of the at least four purification units through different valve control units, the second output pipeline is connected with the second pipelines of the at least four purification units through different valve control units, and the second output pipeline is connected with the regenerated gas heating unit; The third input pipeline is connected with the regenerated gas heating unit and connected with the second pipelines of the at least four purification units through different valve control units, the third output pipeline is connected with the first pipelines of the at least four purification units through different valve control units, the third output pipeline is connected with the regenerated gas cooling unit, and the regenerated gas cooling unit is connected with the separation unit.

4. The raw gas cleaning device according to claim 3, characterized in that The raw gas purification device further comprises a flow regulating unit, the flow regulating unit is connected with the first input pipeline and the second input pipeline, and the flow regulating unit is used for making the flow of raw gas entering the first input pipeline greater than the flow of raw gas entering the second input pipeline.

5. The raw gas cleaning device according to claim 3, characterized in that The raw gas purification device further comprises a heat recovery unit, the heat recovery unit is connected with the second output pipeline, the regenerated gas heating unit, the third output pipeline and the regenerated gas cooling unit.

6. The raw gas cleaning device according to claim 5, characterized in that The raw gas purification device further comprises a temperature control valve unit, the temperature control valve unit is used for conducting the second output pipeline, the heat recovery unit and the regenerated gas heating unit when the temperature of the gas conveyed by the second output pipeline is lower than a temperature threshold value, and the temperature control valve unit is also used for conducting the second output pipeline and the regenerated gas heating unit when the temperature of the gas conveyed by the second output pipeline is not lower than the temperature threshold value.

7. The raw gas cleaning device according to claim 3, characterized in that The separation unit is also in communication with the first input pipe.

8. The raw gas cleaning device according to claim 7, characterized in that The separation unit comprises a heat exchanger and a gas-liquid separator; The first inlet of the heat exchanger is used for inputting refrigerant, and the first outlet of the heat exchanger is used for discharging refrigerant; the second inlet of the heat exchanger is in communication with the regenerative gas cooling unit, the second outlet of the heat exchanger is in communication with the inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is in communication with the first input pipe, the liquid outlet of the gas-liquid separator is in communication with the third inlet of the heat exchanger, and the third outlet of the heat exchanger is used for discharging adsorbed impurities.

9. The raw gas cleaning device according to any one of claims 1 to 8, characterized in that The raw gas purification device further comprises a filtering unit, the inlet of the filtering unit is in communication with the second pipe of each of the purification units, and the outlet of the filtering unit is used for discharging the raw gas after being adsorbed.

10. The raw gas cleaning device according to any one of claims 1 to 8, characterized in that The raw gas comprises natural gas, and the adsorption tower is used for adsorbing heavy hydrocarbon substances.

11. A production system, characterized by The production device is used for providing the raw gas. The production device is used for providing the raw gas.

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