CN211595550U - Natural gas decarbonization system - Google Patents
Natural gas decarbonization system Download PDFInfo
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- CN211595550U CN211595550U CN201922335016.9U CN201922335016U CN211595550U CN 211595550 U CN211595550 U CN 211595550U CN 201922335016 U CN201922335016 U CN 201922335016U CN 211595550 U CN211595550 U CN 211595550U
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Abstract
The utility model relates to a natural gas decarbonization system, which comprises a raw material gas pipe, a dehydration unit, a hydrocarbon decarbonization unit, a first cold blowing pipeline component, a purified gas output pipe, a first heating regeneration unit, a first recovery unit and a replacement pipeline component; the replacement pipeline component comprises an air supply pipe and an air return pipe; the air supplementing pipe is connected between the purified gas output pipe and the first heating regeneration pipe so as to input the purified gas into the hydrocarbon and carbon removal unit through the first heating regeneration pipe for purging; the air return pipe is connected between the first heating regeneration pipe and the purification pipeline assembly so as to convey the purged purification gas into the purification pipeline assembly. Carry the purified gas to the hydrocarbon decarbonization unit that takes off at the end of the heating regeneration state through air supplement pipe and first heating regenerating pipe for the purified gas in the first cold blowing pipeline subassembly obtains pure purified gas at the end of first cold blowing pipeline subassembly after taking off hydrocarbon decarbonization unit cold blowing, so that the purified gas output tube was discharged is cleaner.
Description
Technical Field
The utility model relates to a natural gas purifies technical field, in particular to natural gas decarbonization system.
Background
The coal bed gas belongs to unconventional natural gas, mainly consists of more than 95 percent of methane, is a high-quality clean energy source, and has good effect on industry and civilian use as a fuel. The decarbonization of the coal bed gas is a necessary procedure before liquefaction, the decarbonization process of the natural gas at present mainly adopts an MDEA (medium density polyethylene) process, and the MDEA decarbonization process is relatively complex and has large design allowance and serious resource waste due to stable components of the coal bed gas, low carbon dioxide content and low heavy hydrocarbon content. In the prior art, a dry decarburization mode is commonly used for coal bed gas. A Temperature Swing Adsorption (TSA) method is adopted in the dry decarburization, and the purpose of removing carbon dioxide, moisture and heavy hydrocarbon in the natural gas is achieved by utilizing a molecular sieve or a combination of the molecular sieve and other adsorbents. The method has the obvious advantages of simple flow, simple and convenient operation, no corrosion and pollution, small occupied area, low operating cost and the like. In the existing decarburization process, the decarburization unit after heating and regeneration is generally directly cooled by using the purified gas, and then the purified gas used for cooling is directly conveyed to the purified gas output pipe and discharged for use. However, since the temperature in the decarburization unit after the heating regeneration is completed is high, the carbon dioxide remaining in the decarburization unit cannot be absorbed, so that the carbon dioxide enters the purified gas outlet pipe along with the purified gas used as the cold blow, and the purified gas in the purified gas outlet pipe contains impurities.
SUMMERY OF THE UTILITY MODEL
The main object of the utility model is to provide a natural gas decarbonization system for clear away the carbon dioxide in the decarbonization unit after heating regeneration finishes, in order to obtain purer purified gas.
In order to solve the technical problem, the utility model adopts the following technical scheme:
according to one aspect of the present invention, the present invention provides a natural gas decarbonization system, comprising a raw material gas pipe, a dehydration unit, a decarbonization and dealkylation unit, a first cold blowing pipeline assembly, a purified gas output pipe, a first heating and regeneration unit, a first recovery unit and a replacement pipeline assembly; the raw material gas pipe is used for introducing raw material gas; the purification pipeline assembly is sequentially connected with the raw material gas pipe, the dehydration unit and the hydrocarbon and carbon removal unit so as to sequentially remove moisture, heavy hydrocarbon and carbon dioxide from the raw material gas to obtain purified gas; the first cold blowing pipeline assembly is connected between the tail end of the purification pipeline assembly and the hydrocarbon and carbon removal unit so as to carry out cold blowing treatment on the hydrocarbon and carbon removal unit by utilizing a part of purification gas; a purified gas output pipe is connected with the tail end of the purification pipeline assembly and the tail end of the first cold blowing pipeline assembly so as to discharge purified gas outwards; the first heating regeneration unit comprises a first heating regeneration pipe and a first heater arranged on the first heating regeneration pipe; the first heating regeneration pipe is connected with the hydrocarbon and carbon removal unit to form a circulating pipeline for flowing of regeneration gas so as to carry out heating regeneration treatment on the hydrocarbon and carbon removal unit; the first recovery unit is connected with the first heating regeneration pipe so as to recover the regeneration gas in the hydrocarbon and carbon removal unit when the hydrocarbon and carbon removal unit subjected to heating regeneration treatment is decompressed; the replacement pipeline component comprises an air supply pipe and an air return pipe; the gas supplementing pipe is connected between the purified gas output pipe and the first heating and regenerating pipe so as to input the purified gas into the hydrocarbon and carbon removal unit through the first heating and regenerating pipe for purging; the air return pipe is connected between the first heating regeneration pipe and the purification pipeline assembly so as to convey the purified air after purging to the interior of the purification pipeline assembly.
Optionally, the dehydration unit comprises three dehydration towers, and each dehydration tower is filled with a molecular sieve for adsorbing moisture; the three dehydration towers are connected in parallel, so that the three dehydration towers are respectively dehydrated in adsorption, regeneration and cold blowing states at the same time; the hydrocarbon and carbon removal unit comprises three hydrocarbon and carbon removal towers, and each hydrocarbon and carbon removal tower is filled with a filler for adsorbing heavy hydrocarbon and carbon dioxide; the three hydrocarbon-removing and decarbonizing towers are connected in parallel, so that the three hydrocarbon-removing and decarbonizing towers are respectively in an adsorption state, a regeneration state and a cold blowing state at the same time.
Optionally, a pressure equalizing pipe is arranged between the first cold blowing pipeline assembly and the first heating and regenerating pipe to convey the purified gas in the first cold blowing pipeline assembly to the decarbonizing and decarbonizing unit so as to perform pressure equalizing treatment on the decarbonizing and decarbonizing tower in a regeneration state, and a connection point of the pressure equalizing pipe and the first heating and regenerating pipe is positioned at the downstream of the first heater.
Optionally, the first heating and regenerating unit further comprises a bypass pipe, the bypass pipe is connected in parallel with the hydrocarbon-removing and decarbonizing unit, and the bypass pipe is connected with the first heating and regenerating pipe to form a bypass circulation loop for flowing of regenerated gas when the hydrocarbon-removing and decarbonizing tower in a regenerating state is subjected to pressure relief treatment or when a pressure equalizing pipe is used for performing pressure equalizing treatment on the hydrocarbon-removing and decarbonizing tower in the regenerating state.
Optionally, the first cold blowing pipeline assembly is connected with an inlet and an outlet of each of the decarbonizing towers through a valve so as to control purified gas to pass through the decarbonizing towers in a cold blowing state.
Optionally, the purge line assembly is connected to an inlet and an outlet of each of the dehydration columns and an inlet and an outlet of each of the decarbonization columns through valves to control the feed gas to sequentially pass through the dehydration column in an adsorption state and the decarbonization column in an adsorption state.
Optionally, the first recovery unit comprises a first exhaust pipe, a gas release pipe and a plurality of gas release tanks, one end of the first exhaust pipe is connected to the first heating regeneration pipe, and the other end of the first exhaust pipe is connected to the gas release pipe and the plurality of gas release tanks through valves, so as to receive the regeneration gas in the regeneration state in the hydrocarbon-removing decarbonization tower and selectively deliver the regeneration gas into the gas release pipe or the gas release tanks; and the outlets of the plurality of the relief gas tanks are respectively connected with the gas leakage pipe through valves.
Optionally, the decarbonization system further comprises a second cold blowing pipeline assembly, a second heating and regenerating unit and a second recovery unit; the second cold blowing pipeline assembly is connected with the raw material gas pipe and the dehydration tower so as to carry out cold blowing treatment on the dehydration unit by utilizing a part of raw material gas; the second heating regeneration unit comprises a second heating regeneration pipe and a second heater arranged on the second heating regeneration pipe; the second heating regeneration pipe is connected with the second cold blowing pipeline assembly and the dehydration unit so as to heat the cold-blown feed gas into regeneration gas, and the regeneration gas is used for heating and regenerating the dehydration unit; the second recovery unit is connected with the tail end of the second heating regeneration pipe so as to recover the regeneration gas in the dehydration tower subjected to heating regeneration.
Optionally, the second recovery unit comprises a second exhaust pipe, a dehydrated regenerated gas cooler, a gas-liquid separator and a recovery pipe, two ends of the second exhaust pipe are respectively connected with the tail end of the second heating regenerated pipe and the inlet of the gas-liquid separator, the dehydrated regenerated gas cooler is arranged on the second exhaust pipe, and two ends of the recovery pipe are respectively connected with the gas outlet of the gas-liquid separator and the purification pipeline assembly; the liquid outlet of the gas-liquid separator is connected with a collecting tank.
Optionally, the head end of the second cold blowing pipeline assembly is connected to the raw material gas pipe, and the second cold blowing pipeline assembly is connected to the inlet and outlet of each dehydration tower through a valve so as to control the raw material gas to pass through the dehydration towers in a cold blowing state; the head end of the second heating regeneration pipe is connected with the tail end of the second cold blowing pipeline assembly, the second heating regeneration pipe is connected with each dehydrating tower inlet and outlet through valves, so that the feed gas in the second cold blowing pipeline assembly is heated into regeneration gas, and the regeneration gas is controlled to pass through the dehydrating tower in a regeneration state.
According to the above technical scheme, the utility model discloses following beneficial effect has at least:
the technical scheme of the utility model in, utilize the dehydration unit and take off hydrocarbon decarbonization unit, take off moisture, heavy hydrocarbon and carbon dioxide in the feed gas in proper order, obtain the purified gas. Two ends of the first heating regeneration pipe are connected with the hydrocarbon and carbon removal unit so as to heat and regenerate the hydrocarbon and carbon removal unit. Carry the purified gas to the final stage of heating regeneration state through air supplement pipe and first heating regenerating pipe in the decarbonization unit of taking off hydrocarbon, with the natural gas in the replacement decarbonization unit of taking off hydrocarbon, and carry remaining carbon dioxide gas in the decarbonization unit of taking off hydrocarbon to purify the pipeline subassembly through the circulating pipe together along with purifying, take off hydrocarbon decarbonization unit in heavy hydrocarbon and carbon dioxide and accomplish the discharge, make the purified gas in the first cold blowing pipeline subassembly after taking off hydrocarbon decarbonization unit cold blowing, obtain pure purified gas at the end of first cold blowing pipeline subassembly, so that the purified gas output tube is discharged is cleaner.
Drawings
FIG. 1 is a schematic view of a connection structure of an embodiment of a natural gas decarbonization system of the present invention;
FIG. 2 is a schematic diagram of a portion of the connection of the natural gas decarbonization system of FIG. 1;
fig. 3 is a schematic view of another connection structure of the natural gas decarbonization system of fig. 1.
The reference numerals are explained below:
11. a raw material gas pipe; 12. a dehydration unit; 121. a dehydration tower; 13. a decarbonization and decarbonization unit; 131. a hydrocarbon and carbon removal tower; 14. a purge line assembly; 141. an intake manifold; 142. a first purge line; 143. a second purge line; 15. a first cold blow pipe assembly; 151. a first cold blow branch pipe; 152. a second cold blow branch pipe; 153. a cold blow gas cooler; 16. a purified gas output pipe; 161. a first dust filter; 17. a first heating regeneration unit; 171. a first heating regeneration pipe; 172. a first heater; 173. a second dust filter; 174. a decarbonized regenerated gas cooler; 175. a recycle compressor; 176. a bypass pipe; 18. a first recovery unit; 181. a first exhaust pipe; 182. an air escape pipe; 183. discharging the gas tank; 19. a pressure equalizing pipe; 21. a replacement pipe assembly; 211. a gas supplementing pipe; 212. an air return pipe; 22. a second cold blow pipe assembly; 221. a third cold blow branch pipe; 222. a fourth cold blow branch pipe; 23. a second heating regeneration unit; 231. a second heating regeneration pipe; 232. a second heater; 24. a second recovery unit; 241. a second exhaust pipe; 242. A dehydrated regenerated gas cooler; 243. a gas-liquid separator; 244. a recovery pipe; 245. and (4) a collection tank.
Detailed Description
Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
Referring to fig. 1, the present embodiment provides a natural gas decarbonization system, which includes a raw gas pipe 11, a dehydration unit 12, a decarbonization and decarbonization unit 13, and a purge line assembly 14. A raw gas pipe 11 for introducing the raw gas, a dehydration unit 12 for removing moisture from the raw gas and discharging the dehydrated natural gas downward to a decarbonization and dealkylation unit 13, and the natural gas is dealkylated in the decarbonization and dealkylation unit 13 to remove heavy hydrocarbon and carbon dioxide. The dehydration and the decarburization are carried out independently, so that the influence of moisture on the removal of carbon dioxide is avoided. The purification pipeline assembly 14 is sequentially connected with the raw material gas pipe 11, the dehydration unit 12 and the hydrocarbon and carbon removal unit 13, so that the raw material gas is sequentially subjected to moisture removal, heavy hydrocarbon removal and carbon dioxide removal to obtain purified gas. The dehydration unit 12 is filled with a molecular sieve for adsorbing moisture, and the hydrocarbon and carbon removal unit 13 is filled with a filler for adsorbing heavy hydrocarbon and carbon dioxide. In the implementation, the natural gas is purified by utilizing the temperature swing adsorption principle of the molecular sieve and the activated carbon. The raw material gas is coal bed gas.
Referring to fig. 2 and 3, the dehydration unit 12 includes three dehydration towers 121, and each dehydration tower 121 is filled with a molecular sieve for adsorbing moisture; the three dehydration towers 121 are connected in parallel to make the three dehydration towers 121 in adsorption, regeneration and cold blowing states at the same time; the dehydration tower 121 in an adsorption state is used for dehydrating natural gas; the dehydration tower 121 in a regeneration state heats the molecular sieve in the dehydrated carbon to resolve and take away the moisture on the molecular sieve; and the dehydration tower 121 in a cold blowing state is used for cold blowing the molecular sieve in the dehydration tower 121 to reduce the temperature of the molecular sieve, so that the molecular sieve can be used for adsorbing moisture again. The functions of the dehydration towers 121 are controlled and switched by valves connected to the respective dehydration towers 121.
The decarbonization and decarbonization unit 13 comprises three decarbonization and decarbonization towers 131, wherein a filler for adsorbing heavy hydrocarbon and carbon dioxide is filled in each decarbonization and decarbonization tower 131; the three decarbonizing towers 131 are connected in parallel to make the three decarbonizing towers 131 in the adsorption, regeneration and cold blowing states at the same time. The decarbonizing column 131 is used to adsorb heavy hydrocarbons and carbon dioxide, and the functions of the decarbonizing column 131 are controlled and switched by valves connected to the respective decarbonizing columns 131.
In this embodiment, the bottom and the top of the dehydration tower 121 and the hydrocarbon and carbon removal tower 131 are opened with an inlet and an outlet.
In other embodiments, the dehydration unit 12 may include more than three dehydration columns 121, and the decarbonization and dealkylation unit 13 may include more than three decarbonization and dealkylation columns 131.
Further, the purge line assembly 14 includes an intake manifold 141, a first purge pipe 142, and a second purge pipe 143; the inlet end of the inlet manifold 141 is connected to the raw material gas pipe 11, the outlet end is connected to the inlet and outlet at the bottom of each dehydration tower 121 through a valve, so as to control a part of raw material gas to enter the dehydration tower 121 in an adsorption state, and the raw material gas is dehydrated in the dehydration tower 121 in the adsorption state.
The inlet end of the first purifying pipe 142 is connected with the inlet and outlet at the top of each dehydrating tower 121 through a valve, and the outlet end is connected with the inlet and outlet at the bottom of each decarbonizing and decarbonizing tower 131 through a valve, so that the dehydrated natural gas is controlled to enter the decarbonizing and decarbonizing tower 131 in an adsorption state, heavy hydrocarbon and carbon dioxide gas are removed in the decarbonizing and decarbonizing tower 131, and purified gas is obtained.
The inlet end of the second purification pipe 143 is connected to the inlet and outlet of the top of each of the decarbonizing and hydrocarbon-removing columns 131 through a valve to obtain purified gas at the outlet end of the second purification pipe 143.
The decarburization system of this embodiment further includes a first cold blow line assembly 15 and a purge gas outlet pipe 16, and the first cold blow line assembly 15 is connected between the end of the purge line assembly 14 and the decarburization unit 13 to cold blow the decarburization unit 13 with a part of the purge gas and to deliver the purge gas for cold blowing into the purge gas outlet pipe 16.
The first cold blowing pipeline assembly 15 is connected with the inlet and outlet of the decarbonizing and hydrocarbon removing tower 131 through a valve so as to control the purified gas to pass through the inside of the decarbonizing and hydrocarbon removing tower 131 in a cold blowing state. Specifically, the first cold blow pipeline assembly 15 includes a first cold blow branch pipe 151 and a second cold blow branch pipe 152, an air inlet end of the first cold blow branch pipe 151 is connected to a terminal end of the second purification pipe 143, and an air outlet end of the first cold blow branch pipe 151 is connected to an inlet and an outlet at the bottom of each of the decarbonizing towers 131 through a valve, so as to control purified air to enter the decarbonizing towers 131 in a cold blow state, and to cool the filler in the decarbonizing towers 131.
The inlet end of the second cold blow branch pipe 152 is connected to the inlet and outlet of the top of each of the decarbonizing towers 131 through a valve, and the outlet end of the second cold blow branch pipe 152 is connected to the purified gas outlet pipe 16, so that the purified gas in the decarbonizing towers 131 in the cold blow state is discharged into the purified gas outlet pipe 16.
Further, a purge gas outlet pipe 16 connects the end of the purge line assembly 14 and the end of the first cold blow line assembly 15 to discharge the purge gas to the outside. Specifically, the purge gas outlet pipe 16 is connected to the end of the second purge pipe 143 and the exhaust end of the second cold blow branch pipe 152, and the end of the purge gas outlet pipe 16 is connected to a surrounding liquefied cold box to store the purge gas.
In this embodiment, the purge gas from the end of the second purge tube 143 is divided into two parts, and one part is discharged directly into the purge gas take-off pipe 16; a part of the cold air discharged into the first cold blow piping assembly 15 is used as cold blow air for cold blowing the decarbonizing tower 131 in a cold blow state, and the cold blow air used for cold blowing is discharged to the purified air outlet pipe 16 to be discharged as purified air.
Further, a cold blow-gas cooler 153 is provided in the second cold blow-branch pipe 152 so that the cold blow-gas in the second cold blow-branch pipe 152 is cooled and discharged into the purge gas outlet pipe 16. The purified gas outlet pipe 16 is provided with a first dust filter 161 for filtering the dust in the purified gas from the second purifying pipe 143 and the dust in the cold blow air discharged from the second cold blow branch pipe 152.
The decarbonization system of the embodiment further includes a first heating regeneration unit 17 and a first recovery unit 18, and the first heating regeneration unit 17 is configured to perform a heating regeneration treatment on the decarbonization tower 131 in a regeneration state, and discharge a regeneration gas after the heating regeneration treatment into the first recovery unit 18.
The first heating regeneration unit 17 includes a first heating regeneration pipe 171 and a first heater 172 disposed thereon; the first heating and regenerating pipe 171 is connected to the decarbonizing and dealkylating unit 13 to form a circulation line for flowing a regeneration gas to perform a heating and regenerating process on the decarbonizing and dealkylating unit 13;
further, the first heating regeneration pipe 171 is connected with the inlet and outlet at the top and the bottom of the decarbonizing tower 131 through a valve, and by controlling the opening and closing of the valve, the first heating regeneration pipe 171 and the decarbonizing tower 131 in the regeneration state form a circulation pipeline, the first heater 172 heats natural gas in the circulation pipeline to obtain regenerated gas, and the regenerated gas heats the filler in the decarbonizing tower 131 in the regeneration state, so that heavy hydrocarbon and carbon dioxide in the filler are analyzed.
In the present embodiment, the regeneration gas in the regeneration state inside the decarbonizing tower 131 comes from the natural gas already existing in the decarbonizing tower 131, which is switched from the adsorption state to the regeneration state. The regeneration gas is circulated in a closed manner for 2.8 hours in a circulation line forming a circulation line between the first heating regeneration pipe 171 and the hydrocarbon-removing and decarbonizing tower 131 in a regenerated state, and then discharged to the outside.
Further, the first recovery unit 18 is connected to the first heating regeneration pipe 171 to recover the regeneration gas in the decarburization unit 13 when the decarburization unit 13 is depressurized in the heating regeneration treatment. Specifically, the first recovery unit 18 includes a first exhaust pipe 181, a bleed pipe 182, and a plurality of bleed air tanks 183; one end of the first exhaust pipe 181 is connected to the first heating regeneration pipe 171, and the other end thereof is connected to the air release pipe 182 and the plurality of relief gas tanks 183 through valves, so as to receive the regeneration gas in the regeneration state in the decarbonization tower 131 and selectively deliver the regeneration gas to the air release pipe 182 or the relief gas tanks 183;
the first heating/regenerating pipe 171 is provided with a valve for controlling the discharge of the regenerating gas into the first exhaust pipe 181, and in this embodiment, the valve is provided on the first heating/regenerating pipe 171 and is located downstream of the connection point of the first exhaust pipe 181 and the first heating/regenerating pipe 171. By closing the valve, the regeneration gas heated by circulation in the decarbonizing and decarbonizing tower 131 in the regeneration state is discharged into the first exhaust pipe 181. The regeneration gas in the first exhaust pipe 181 is selectively discharged into the air release pipe 182 or the air release tank 183 through the control of a valve.
Further, the plurality of relief gas tanks 183 includes at least one intermediate pressure relief gas tank 183 and one low pressure relief gas tank 183 for receiving regeneration gas at different time periods and at different pressures. The regenerated gas in the air release pipe 182 passes through a cooler and is discharged outwards, and can be used as fuel of a heat-conducting oil furnace. The outlets of the plurality of relief gas tanks 183 are respectively connected to the relief pipe 182 through valves, so that the regeneration gas stored in the relief gas tanks 183 can be discharged to the outside for use as fuel.
The decarbonization system of the embodiment further comprises a pressure equalizing pipe 19 and a replacement pipe assembly 21, wherein after the recycled regeneration gas in the decarbonization tower 131 in the regeneration state is discharged into the first recovery unit 18, natural gas is introduced into the decarbonization tower 131 through the pressure equalizing pipe 19, and the pressure equalizing time is 20 minutes, so that the pressure in the decarbonization tower 131 reaches a preset value, and the subsequent operation is facilitated.
Further, a pressure equalizing pipe 19 is provided between the first cold blow line assembly 15 and the first heating/regenerating pipe 171 to send the purified gas in the first cold blow line assembly 15 to the decarburization unit 13 for equalizing the pressure of the decarburization tower 131 in a regeneration state, and a connection point of the pressure equalizing pipe 19 and the first heating/regenerating pipe 171 is located downstream of the first heater 172. In this embodiment, the pressure equalizing pipe 19 is connected between the second cold blow branch pipe 152 and the first heating/regenerating pipe 171, and the first heating/regenerating pipe 171 is provided with a valve corresponding to the pressure equalizing pipe 19, the valve being located between a connection point of the pressure equalizing pipe 19 to the first heating/regenerating pipe 171 and the first heater 172, and the valve is closed to cut off the flow of the regeneration gas in the first heating/regenerating pipe 171 into the regeneration-state decarbonization column 131, and at this time, the purge gas in the second cold blow branch pipe 152 is sent to the regeneration-state decarbonization column 131 through the pressure equalizing pipe 19. The pressure equalizing pipe 19 is also provided with a valve for controlling the opening and closing of the pressure equalizing pipe 19.
The first heating and regenerating unit 17 further includes a bypass pipe 176, the bypass pipe 176 is connected in parallel to the decarburization unit 13, and both ends of the bypass pipe 176 are connected to the first heating and regenerating pipe 171 to form a bypass circulation circuit through which the regeneration gas flows when the pressure in the regeneration-state decarburization tower 131 is released or when the pressure in the regeneration-state decarburization tower 131 is equalized by the pressure equalizing pipe 19. The bypass pipe 176 is provided so that the first heater 172 does not need to be turned off when the pressure of the hydrocarbon-removing and decarbonizing tower 131 in a regeneration state is released or equalized, and the regeneration gas generated in the first heater 172 passes through the bypass pipe 176 and then returns to the first heater 172 to form a circulation loop. A valve is provided on the bypass line 176 to control the opening and closing of the bypass line 176.
Further, the replacement piping assembly 21 includes an air supplement pipe 211 and an air return pipe 212; the gas make-up pipe 211 is connected between the purified gas output pipe 16 and the first heating and regenerating pipe 171 to supply the purified gas to the decarburization unit 13 through the first heating and regenerating pipe 171 for purging.
The first heating/regenerating pipe 171 is further provided with a second dust filter 173, a decarbonized/regenerated gas cooler 174, and a recycle compressor 175 in this order. The recycle compressor 175 is located upstream of the first heater 172. The connection point of the gas supply pipe 211 on the first heating/regenerating pipe 171 is located upstream of the recycle compressor 175, so that the purified gas supplemented by the gas supply pipe 211 is heated and sent to the inside of the decarbonization and hydrocarbon removal tower 131 in a regeneration state, and the decarbonization and hydrocarbon removal tower 131 is purged, so that the carbon dioxide gas remaining in the decarbonization and hydrocarbon removal tower 131 flows out of the decarbonization and hydrocarbon removal tower 131 together with the purified gas. The air supply pipe 211 is provided with a valve to control the opening and closing of the air supply pipe 211.
Further, a gas return pipe 212 is connected between the first heating regeneration pipe 171 and the purge line assembly 14 to convey the purged purge gas into the purge line assembly 14. In this embodiment, the muffler 212 is connected to the first purge pipe 142; the carbon dioxide gas remaining in the regeneration-state decarbonizing tower 131 and the purified gas are mixed and then sent to the first purification pipe 142, and the purified gas is sent to the adsorption-state decarbonizing tower 131 to remove the carbon dioxide again.
It will be appreciated that the gas return pipe 212 may also be connected between the intake manifold 141 and the first heating regeneration pipe 171 to transport the natural gas in the gas return pipe 212 to the intake manifold 141 for reuse.
A valve is provided between the connection point of the air supply pipe 211 to the first heating/regenerating pipe 171 and the connection point of the air return pipe 212 to the first heating/regenerating pipe 171, and a valve is also provided in the air return pipe 212 to control the purified air flowing out of the air supply pipe 211 to pass through the regeneration-state decarbonization tower 131 and then to be discharged into the air return pipe 212. The connection point of the return pipe 212 to the first heating/regenerating pipe 171 is located downstream of the decarburization/regenerating gas cooler 174, so that the purified gas flowing out of the regeneration-state decarburization tower 131 is cooled and discharged into the return pipe 212, and the temperature of the natural gas entering the decarburization/decarbonizing tower 131 from the return pipe 212 is low, and carbon dioxide can be directly removed from the adsorption-state decarburization/decarbonizing tower 131 without cooling again.
In this embodiment, the natural gas in the regeneration state inside the decarbonizing and decarbonizing column 131 is first heated by the first heating regeneration pipe 171 to obtain a regeneration gas; and between the first heating regeneration pipe 171 and the circulation line formed in the inside of the dealkylation and decarbonization tower 131 in a regeneration state, the regeneration gas is circulated for 2.8 hours and then discharged into the first recovery unit 18. After the regeneration gas in the regeneration-state decarbonization and decarbonization tower 131 is discharged into the first recovery unit 18, the pressure in the regeneration-state decarbonization and decarbonization tower 131 is adjusted to a preset value by using the pressure equalizing pipe 19, the pressure equalizing treatment time is 20 minutes, after the pressure equalizing treatment, the pressure equalizing pipe 19 is closed, the carbon dioxide gas remaining in the regeneration-state decarbonization and decarbonization tower 131 is purged by using the replacement pipeline assembly 21, and the purged purified gas is conveyed to the first purification pipe 142 for reuse.
Referring to fig. 3, the decarbonization system of the present embodiment further includes a second cold blowing pipeline assembly 22, a second heating and regenerating unit 23, and a second recycling unit 24.
The second cold blow pipe assembly 22 connects the raw material gas pipe 11 and the dehydration tower 121 to perform cold blow processing on the dehydration unit 12 using a portion of the raw material gas.
In this embodiment, the head end of the second cold blowing pipeline assembly 22 is connected to the raw material gas pipe 11, and the second cold blowing pipeline assembly 22 is connected to the inlet and outlet of each dehydration tower 121 through a valve, so as to control the raw material gas to pass through the dehydration tower 121 in the cold blowing state. Specifically, the second cold-blowing pipeline assembly 22 includes a third cold-blowing branch pipe 221 and a fourth cold-blowing branch pipe 222, the air inlet end of the third cold-blowing branch pipe 221 is connected to the raw material pipe 11, and the air outlet end is connected to the inlet and outlet at the bottom of each dehydration tower 121 through a valve, so as to control the raw material gas to enter the dehydration tower 121 in a cold-blowing state, and perform cold-blowing treatment on the dehydration tower 121.
The inlet end of the fourth cold blow branch pipe 222 is connected to the inlet and outlet of the top of each dehydration tower 121 through a valve, and the outlet end thereof is connected to the second heating and regenerating unit 23, so as to discharge the raw material gas used for cold blow treatment into the second heating and regenerating unit 23.
Further, the second heating regeneration unit 23 includes a second heating regeneration pipe 231 and a second heater 232 disposed thereon; the second heating regeneration pipe 231 is connected to the second cold blowing pipeline assembly 22 and the dehydration unit 12, so as to heat the cold-blown raw material gas into regeneration gas, and perform heating regeneration treatment on the dehydration unit 12 by using the regeneration gas.
In this embodiment, the head end of the second heating regeneration pipe 231 is connected to the tail end of the second cold blowing pipeline assembly 22, and the second heating regeneration pipe 231 is connected to the inlet and outlet of each dehydration tower 121 through a valve, so as to heat the raw material gas in the second cold blowing pipeline assembly 22 into the regeneration gas and control the regeneration gas to pass through the dehydration tower 121 in the regeneration state. Specifically, the second heating regeneration pipe 231 is connected to the top and bottom inlets and outlets of each dehydration tower 121 through valves, the head end of the second heating regeneration pipe 231 is connected to the exhaust end of the fourth cold blow branch pipe 222, and the tail end thereof is connected to the second recovery unit 24, so as to discharge the regeneration gas into the dehydration tower 121 in the regeneration state, and convey the regeneration gas passing through the dehydration tower 121 in the regeneration state to the second recovery unit 24.
Further, the second recovery unit 24 is connected to an end of the second heating regeneration pipe 231 to recover the regeneration gas in the dehydration tower 121 heated for regeneration. Specifically, the second recovery unit 24 includes a second exhaust pipe 241, a dehydrated regenerated gas cooler 242, a gas-liquid separator 243, and a recovery pipe 244, wherein two ends of the second exhaust pipe 241 are respectively connected to the end of the second heating regenerated pipe 231 and the inlet of the gas-liquid separator 243, the dehydrated regenerated gas cooler 242 is disposed on the second exhaust pipe 241, and two ends of the recovery pipe 244 are respectively connected to the gas outlet of the gas-liquid separator 243 and the purge line assembly 14. The regeneration gas is sent to the gas-liquid separator 243 through the second exhaust pipe 241, the gaseous natural gas and the liquid moisture in the regeneration gas are separated in the gas-liquid separator 243, and the natural gas in the gas-liquid separator 243 is discharged into the intake manifold 141 through the recovery pipe 244 and used as the raw gas. The liquid outlet of gas-liquid separator 243 is connected to a collection tank 245 to collect the liquid collected in gas-liquid separator 243.
It is understood that the natural gas in the gas-liquid separator 243 may be discharged into the raw gas pipe 11.
In this embodiment, the raw gas in the raw gas pipe 11 is divided into two parts, and one part passes through the dehydration tower 121 in an adsorption state and the dealkylation and decarbonization tower 131 in an adsorption state in sequence to remove moisture, heavy hydrocarbons and carbon dioxide in the natural gas; the other part of the cold blowing air is conveyed into the dehydration tower 121 in a cold blowing state through a third cold blowing branch pipe 221, and then conveyed to the head end of a second heating regeneration pipe 231 through a fourth cold blowing branch pipe 222, the cold blowing air is heated into regeneration air by a second heater 232 in the second heating regeneration pipe 231, the regeneration air enters the dehydration tower 121 in a regeneration state through the second heating regeneration pipe 231, and then is discharged into the second recovery unit 24 from the tail end of the second heating regeneration pipe 231.
Referring to fig. 1 to 3, the operation of the decarbonization system in the present embodiment is as follows:
the feed gas in feed gas line 11 is split into two portions:
a part of the raw material gas enters the intake manifold 141, and passes through the dehydration tower 121 in an adsorption state, the first purification pipe 142, the decarbonization tower 131 in an adsorption state, and the second purification pipe 143 in this order by being conveyed by the intake manifold 141, and moisture, heavy hydrocarbons, and carbon dioxide are sequentially removed in the dehydration tower 121 in an adsorption state and the decarbonization tower 131 in an adsorption state, and purified gas is obtained in the second purification pipe 143. The purified gas in the second purification pipe 143 is divided into two parts, one of which is introduced into the purified gas outlet pipe 16 and the other of which is introduced into the cold blowing decarbonizing tower 131 through the first cold branch pipe 151 to be used as cold blowing gas for the decarbonizing unit 13. The cold blow gas in the decarbonizing and decarbonizing unit 13 enters the second cold blow branch pipe 152 after being blown into the decarbonizing and decarbonizing tower 131 by the cold blow gas, and is sent to the purified gas output pipe 16 as the purified gas after being cooled by the cold blow gas cooler 153 on the second cold blow branch pipe 152. The purge gas outlet pipe 16 receives the purge gas from the second purge pipe 143 and the second cold blow branch pipe 152, and then discharges the purge gas to the outside after filtering out the dust in the purge gas through the first dust filter 161 of the purge gas outlet pipe 16. Air release valve
When the gas in the decarbonizing column 131 after the adsorption state is switched to the regeneration state, the decarbonizing column 131 is connected to the first heating/regenerating pipe 171, the natural gas existing in the decarbonizing column 131 is used as the regeneration gas, and the regeneration gas passes through the second dust filter 173, the decarbonizing/regenerating gas cooler 174, the recycle compressor 175, and the first heater 172 in this order, is continuously heated by the first heater 172, and is continuously circulated in the circulation circuit formed between the first heating/regenerating pipe 171 and the decarbonizing column 131 in the regeneration state, so that the heavy hydrocarbons and carbon dioxide in the filler are desorbed and carried. After the regeneration gas is circularly heated for 2.8 hours, the regeneration gas is discharged into the medium-pressure discharge gas tank 183, the low-pressure discharge gas tank 183 and the gas release pipe 182 in sequence and used as fuel of the heat-conducting oil furnace, and the discharge time is 22 minutes. After the end of the purge gas, the circulation between the first heating and regenerating pipe 171 and the regeneration-state decarbonization tower 131 is closed, the first heating and regenerating pipe 171 and the bypass pipe 176 are connected to form a circulation, and the regeneration gas heated in the first heater 172 does not enter the regeneration-state decarbonization tower 131. The pressure equalizing pipe 19 is opened, the purified gas in the second cold blow branch pipe 152 is introduced into the regeneration-state decarbonization tower 131, and after the pressure in the regeneration-state decarbonization tower 131 reaches a preset value, the pressure equalizing pipe 19 is closed, and the pressure equalizing time is 20 minutes. After the pressure equalization is completed, the circulation between the first heating/regenerating pipe 171 and the bypass pipe 176 is closed, the circulation circuit between the first heating/regenerating pipe 171 and the regeneration-state decarbonization tower 131 is opened, the gas supply pipe 211 is opened, the purified gas in the purified gas output pipe 16 is introduced into the first heating/regenerating pipe 171 through the gas supply pipe 211 to be used as the replacement gas, the replacement gas is introduced into the regeneration-state decarbonization tower 131 through the first heating/regenerating pipe 171, the gas in the regeneration-state decarbonization tower 131 is sent to the gas return pipe 212 together with the purified gas, and the purified gas is introduced into the first purification pipe 142 through the gas return pipe 212 to remove the heavy hydrocarbon and carbon dioxide again.
The other part of the raw material gas enters the dehydration tower 121 in the cold blowing state through the third cold blowing branch pipe 221 to be used as cold blowing gas of the dehydration tower 121, the cold blowing gas is conveyed to the second heating regeneration pipe 231 at the fourth cold blowing branch pipe 222 and is heated to form regeneration gas on the second heater 232 on the second heating regeneration pipe 231, the regeneration gas enters the dehydration tower 121 in the regeneration state through the second heating regeneration pipe 231 to heat and regenerate the dehydration tower 121, and the regeneration gas passes through the dehydration tower 121 in the regeneration state and is conveyed into the second exhaust pipe 241 from the tail end of the second heating regeneration pipe 231. The regeneration gas in the dehydration column 121 in the regeneration state is cooled by the dehydrated regeneration gas cooler 242 on the second exhaust pipe 241, then the moisture is separated by the gas-liquid separator 243, and the separated regeneration gas is sent to the intake manifold 141 through the recovery pipe 244 and is joined to the raw gas in the intake manifold 141 to be used as the raw gas. The liquid separated in the gas-liquid separator 243 is discharged into the collection tank 245.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A natural gas decarbonization system comprising:
a raw material gas pipe for introducing raw material gas;
a dehydration unit;
a decarbonization and decarbonization unit;
the purification pipeline assembly is sequentially connected with the raw material gas pipe, the dehydration unit and the hydrocarbon and carbon removal unit so as to sequentially remove moisture, heavy hydrocarbon and carbon dioxide from the raw material gas to obtain purified gas;
the first cold blowing pipeline assembly is connected between the tail end of the purification pipeline assembly and the hydrocarbon and carbon removal unit so as to carry out cold blowing treatment on the hydrocarbon and carbon removal unit by using a part of purification gas;
a purified gas output pipe connecting a terminal of the purification pipe assembly and a terminal of the first cold blow pipe assembly to discharge purified gas to the outside;
a first heating regeneration unit including a first heating regeneration pipe and a first heater disposed thereon; the first heating regeneration pipe is connected with the hydrocarbon and carbon removal unit to form a circulating pipeline for flowing of regeneration gas so as to carry out heating regeneration treatment on the hydrocarbon and carbon removal unit;
a first recovery unit connected to the first heating and regenerating pipe to recover the regeneration gas in the decarbonizing and dealkylating unit when the decarbonizing and dealkylating unit is depressurized;
the replacement pipeline assembly comprises an air supply pipe and an air return pipe; the gas supplementing pipe is connected between the purified gas output pipe and the first heating and regenerating pipe so as to input the purified gas into the hydrocarbon and carbon removal unit through the first heating and regenerating pipe for purging; the air return pipe is connected between the first heating regeneration pipe and the purification pipeline assembly so as to convey the purified air after purging to the interior of the purification pipeline assembly.
2. The decarburization system according to claim 1, wherein the dehydration unit includes three dehydration towers, each of which is filled with a molecular sieve for adsorbing moisture; the three dehydration towers are connected in parallel, so that the three dehydration towers are respectively dehydrated in adsorption, regeneration and cold blowing states at the same time;
the hydrocarbon and carbon removal unit comprises three hydrocarbon and carbon removal towers, and each hydrocarbon and carbon removal tower is filled with a filler for adsorbing heavy hydrocarbon and carbon dioxide; the three hydrocarbon-removing and decarbonizing towers are connected in parallel, so that the three hydrocarbon-removing and decarbonizing towers are respectively in an adsorption state, a regeneration state and a cold blowing state at the same time.
3. The system of claim 2, wherein a pressure equalizer is disposed between the first cold blow line assembly and the first heat regenerator to transfer the purge gas from the first cold blow line assembly to the decarbonization and dealkylation unit for equalizing the pressure of the decarbonization and dealkylation tower in a regeneration state, and a connection point of the pressure equalizer and the first heat regenerator is located downstream of the first heater.
4. The system of claim 3, wherein the first heating and regeneration unit further comprises a bypass line connected in parallel with the decarbonization and decarbonization unit, the bypass line being connected to the first heating and regeneration line to form a bypass circulation loop for the flow of regeneration gas when the decarbonization and decarbonization tower is depressurized in a regeneration state or when a pressure equalizer equalizes the decarbonization and decarbonization tower in a regeneration state.
5. The system of claim 2, wherein the first cold blow line assembly is connected to the inlet and outlet of each of the decarbonizing towers by a valve to control the flow of the purge gas through the decarbonizing towers in a cold blow state.
6. The decarbonization system of claim 2 wherein the purge line assembly is connected to an inlet and an outlet of each of the dehydration columns and an inlet and an outlet of each of the decarbonization columns through valves to control the feed gas to sequentially pass through the dehydration columns in an adsorption state and the decarbonization columns in an adsorption state.
7. The decarbonization system according to claim 2, wherein the first recovery unit comprises a first exhaust pipe, a bleed pipe, and a plurality of bleed gas tanks, wherein one end of the first exhaust pipe is connected to the first heating regeneration pipe, and the other end of the first exhaust pipe is connected to the bleed pipe and the plurality of bleed gas tanks through valves to receive the regeneration gas in the decarbonization tower in a regeneration state and selectively deliver the regeneration gas into the bleed pipe or the bleed gas tanks; and the outlets of the plurality of the relief gas tanks are respectively connected with the gas leakage pipe through valves.
8. The decarbonization system of claim 2, further comprising:
the second cold blowing pipeline assembly is connected with the raw material gas pipe and the dehydration tower so as to carry out cold blowing treatment on the dehydration unit by utilizing a part of raw material gas;
a second heating regeneration unit including a second heating regeneration pipe and a second heater disposed thereon; the second heating regeneration pipe is connected with the second cold blowing pipeline assembly and the dehydration unit so as to heat the cold-blown feed gas into regeneration gas, and the regeneration gas is used for heating and regenerating the dehydration unit;
and a second recovery unit connected to an end of the second heating regeneration pipe to recover the regeneration gas in the dehydration tower that is heated and regenerated.
9. The decarburization system according to claim 8, wherein the second recovery unit includes a second exhaust pipe, a dehydrated regeneration gas cooler, a gas-liquid separator, and a recovery pipe, both ends of the second exhaust pipe are connected to the end of the second heated regeneration pipe and the inlet of the gas-liquid separator, respectively, the dehydrated regeneration gas cooler is disposed on the second exhaust pipe, and both ends of the recovery pipe are connected to the gas outlet of the gas-liquid separator and the purge line assembly, respectively; the liquid outlet of the gas-liquid separator is connected with a collecting tank.
10. The decarburization system according to claim 8, wherein the head end of the second cold blow line assembly is connected to the raw material gas pipe, and the second cold blow line assembly is connected to the inlet and outlet of each dehydration tower through a valve to control the raw material gas to pass through the dehydration towers in a cold blow state;
the head end of the second heating regeneration pipe is connected with the tail end of the second cold blowing pipeline assembly, the second heating regeneration pipe is connected with each dehydrating tower inlet and outlet through valves, so that the feed gas in the second cold blowing pipeline assembly is heated into regeneration gas, and the regeneration gas is controlled to pass through the dehydrating tower in a regeneration state.
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| CN112812869A (en) * | 2020-12-22 | 2021-05-18 | 中国石油天然气集团有限公司 | Natural gas dehydration and dealkylation integrated device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112812869A (en) * | 2020-12-22 | 2021-05-18 | 中国石油天然气集团有限公司 | Natural gas dehydration and dealkylation integrated device and method |
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