CN111205899A - Molecular sieve adsorption device and process for treating natural gas condensate - Google Patents
Molecular sieve adsorption device and process for treating natural gas condensate Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/103—Sulfur containing contaminants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
Abstract
The invention discloses a molecular sieve adsorption device and a process for treating natural gas condensate, wherein the adsorption device comprises at least one group of adsorption towers, a buffer tank, a heat exchanger, a heating furnace and an air cooler, wherein: each group of adsorption towers comprises at least two towers which are arranged between a natural gas condensate inlet pipeline and a treated natural gas condensate outlet pipeline in parallel, and four cut-off valves V1-V4 and V5-V8 are respectively arranged at the bottom and the top of each tower. Compared with the prior art, the invention has the following positive effects: aiming at the working condition that the requirements for impurities such as sulfur and the like in the natural gas condensate are strict, the invention provides a method for removing sulfide and CH in natural gas condensate at normal temperature3The molecular sieve adsorption process of OH and other impurities includes the adsorption, evacuation, purging, regeneration, cold blowing and liquid filling processes, and can effectively remove sulfide, mercaptan and other impurities contained in natural gas condensate, and can implement on-line regeneration and regeneration of molecular sieveThe process is run continuously.
Description
Technical Field
The invention relates to a method for removing sulfide (typically H) in natural gas condensate2S、RSH、RSR、COS、CS2Etc.), CH3A molecular sieve adsorption device and process for OH impurities.
Background
Currently natural gas liquids contain sulfides (typically H)2S、RSH、RSR、COS、CS2Etc.), CH3The removal method of impurities such as OH mainly comprises a wet method and a dry method. The wet method mainly adopts a method of removing various sulfur-containing impurities once or for many times by using physical and chemical solvents such as various amines, formula solvents, alkali (NaOH) and the like.
The treatment of the natural gas condensate with high sulfur content and large treatment capacity comprises two parts: first step of usingThe hydramine solution removes hydrogen sulfide in LPG, or removes COS after hydrolysis, the common hydramine comprises MEA, DI-PA, MDEA, DEA and corresponding complex solution, the process is mature; and the second step is to eliminate mercaptan and other organic sulfur impurity from the natural gas condensate with alkali washing or fine desulfurizing molecular sieve or desulfurizing agent. The desulfurizing agent is mainly divided into two types, one type is a non-renewable desulfurizing agent, the desulfurizing agent and sulfur-containing impurities are chemically adsorbed, the desulfurizing agent is non-renewable and needs to be replaced regularly (about 6 months), and solid waste needs to be treated. The other one is a renewable desulfurizer which is a molecular sieve, and foreign companies adopt a molecular sieve method to simultaneously remove H in condensate2S, COS, RSH, methanol and the like, and the process is suitable for the working conditions with less total sulfur content and strict requirement on the sulfur content of the product, and has the advantages that the molecular sieve can be regenerated on line, and the service life of the molecular sieve is generally 3-5 years.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a molecular sieve adsorption device and a process for treating natural gas condensate, which can effectively remove impurities containing sulfide, mercaptan and the like in light hydrocarbon and realize the regeneration of a molecular sieve through the processes of adsorption, evacuation, purging, regeneration, cold blowing and liquid charging. The invention is suitable for the condition of strict requirements on impurities such as sulfur content and the like of light hydrocarbon products. In addition, different from the traditional alkali washing method, the method is environment-friendly and generates no waste water.
The technical scheme adopted by the invention is as follows: the utility model provides a molecular sieve adsorption equipment for handling natural gas condensate, includes at least a set of adsorption tower, buffer tank, heat exchanger, heating furnace and air cooler, wherein: each group of adsorption towers comprises at least two towers which are arranged between a natural gas condensate inlet pipeline and a treated natural gas condensate outlet pipeline in parallel, and the bottom and the top of each tower are respectively provided with four cut-off valves V1-V4 and V5-V8; a dust particle filter is arranged between the tail end of the treated natural gas condensate outlet pipeline and a shut-off valve V7; the shut-off valve V4 is connected with the buffer tank; the cut-off valve V2 is sequentially connected with the cooling gas filter and the air cooler; set gradually heat exchanger, heating furnace on the regeneration gas import pipeline, the heating furnace is connected with trip valve V6, and trip valve V1, regeneration gas filter, heat exchanger, air cooler connect gradually.
The invention also provides a molecular sieve adsorption process for treating natural gas condensate, which adopts at least two tower processes, wherein when two towers are adopted, one tower is used for adsorption, one tower is used for regeneration and cooling; when three towers are adopted, one tower is used for adsorption, one tower is used for regeneration, and one tower is used for cooling, wherein:
firstly, an adsorption stage:
opening the cut-off valves V3 and V7, keeping other cut-off valves in a closed state, enabling the natural gas condensate to enter the adsorption tower from bottom to top through the inlet cut-off valve V3, enabling the molecular sieve in the tower to physically adsorb sulfide and other impurities in the natural gas condensate, enabling the adsorption time to be 12 hours, enabling the treated natural gas condensate to flow out of the tower top through the cut-off valve V7, filtering the natural gas condensate through a dust particle filter, and then enabling the treated natural gas condensate to flow to a downstream device;
II, an emptying stage:
after the adsorption stage is finished and before the molecular sieve is regenerated, opening the cut-off valves V5 and V4, wherein other cut-off valves are in a closed state, discharging condensate of the adsorption tower to a buffer tank by using cooling gas at the top of the tower, opening a branch line cut-off valve V26 of an NGL loading and unloading tank during liquid discharge operation, and outputting gas generated by the buffer tank to a main regenerated gas pipe after the pressure of the gas is regulated by a pressure regulating valve;
thirdly, purging:
after the condensate in the adsorption tower is drained, closing the stop valve V4 and the NGL loading and unloading tank branch line stop valve V26, continuously keeping the stop valve V5 in an open state, opening the stop valve V2, and blowing the bed layer with cold blowing gas for 30min to remove residual NGL liquid remained in the bed layer; the purge gas enters a cooling gas filter after coming out of the bottom of the adsorption tower;
fourthly, a regeneration stage:
the regeneration gas exchanges heat through a heat exchanger, enters a regeneration tower for regeneration after being heated by a heating furnace, the regeneration time is 12 hours, shut valves V5 and V2 are closed in the regeneration process, shut valves V6 and V1 are opened, hot regeneration gas enters the tower from the top through V6, the regenerated regeneration gas leaves the regeneration tower from the tower bottom through a shut valve V1, enters a regeneration gas filter for filtering to remove solid impurities, is mixed with the cold-blown return regeneration gas after heat exchange through the heat exchanger, and then enters a downstream device after being cooled by an air cooler;
fifthly, cold blowing stage:
after the adsorbent is completely regenerated, closing the stop valves V6 and V1, opening the stop valves V5 and V2, directly feeding cold blow gas into the cooling tower, wherein the cold blow process lasts for 10 hours, and feeding the cold blow gas discharged from the cooling tower into an air cooler for heat exchange after removing entrained molecular sieve dust through a cooler filter and then into a downstream device;
sixthly, liquid filling stage:
after the cold blowing stage is finished, closing the cut-off valves V2 and V5, opening the cut-off valve V4, carrying out NGL liquid filling operation on the adsorption tower through the reverse operation of an NGL unloading line, replacing the NGL in the buffer tank into the adsorption tower through the cut-off valve V25 on a regenerated gas supply line by cooling gas, opening the cut-off valve V8 in the liquid filling operation of the adsorption tower, and closing V4, V25 and V8 after the liquid filling operation is finished.
Compared with the prior art, the invention has the following positive effects:
aiming at the working condition that the requirements of impurities such as sulfur and the like in the natural gas condensate are strict, the invention provides a method for removing sulfide (typical H) in natural gas condensate at normal temperature2S、RSH、RSR、COS、CS2Etc.), CH3The molecular sieve adsorption process for impurities such as OH comprises the processes of adsorption, evacuation, purging, regeneration, cold blowing and liquid charging, can effectively remove the impurities such as sulfide, mercaptan and the like contained in natural gas condensate, and simultaneously realizes the online regeneration of the molecular sieve and the continuous operation of the regeneration process.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic illustration of a molecular sieve adsorption unit for treating natural gas liquids in accordance with the present invention;
FIG. 2 shows the operating conditions and cycle times of the adsorption column;
FIG. 3 is a composition of natural gas condensate, treated condensate and regeneration gas;
FIG. 4 is a graph of the inlet and outlet temperature of a regenerator column over time during regeneration.
Detailed Description
The invention discloses a method for preparing natural gas condensate containing sulfide (typical H)2S、RSH、RSR、COS、CS2Etc.), CH3The process adopts a two-tower or multi-tower flow, at least one tower is kept for adsorption, one tower is kept for cold blowing and regeneration when the device runs, and a cutoff valve is adopted to realize automatic switching of the following steps through program control: adsorption → evacuation → purging → regeneration → cold blowing → charging. And (3) adsorbing the sulfide and impurities in the natural gas condensate at normal temperature, and after the adsorption process is finished, unloading the natural gas condensate in the adsorption tower by adopting gas pressurization and blowing the residual condensate of the molecular sieve bed. The regeneration process adopts hot regeneration gas to remove sulfur-containing compounds and other impurities adsorbed in the molecular sieve. And after the regeneration process is finished, blowing the adsorption tower bed layer by using normal-temperature natural gas, then filling natural gas condensate, and entering the next cycle process.
The specific implementation mode is as shown in figure 1, and comprises three adsorption towers (CD-01, CD-02 and CD-03) which are arranged between a natural gas condensate inlet pipeline and a treated natural gas condensate outlet pipeline in parallel, wherein four cut-off valves are respectively arranged at the bottom and the top of each adsorption tower (a first tower is V1-V8, a second tower is V9-V16, and a third tower is V17-V24). The connection relationship of the shut valves will be described in detail below by taking the first column as an example, and the shut valves of the second column and the third column may correspond to the shut valves of the first column in this order).
A first regulating valve 1 is arranged between the front end of the natural gas condensate inlet pipeline and a stop valve V3, and a third filter (FP-03) is arranged between the tail end of the treated natural gas condensate outlet pipeline and a stop valve V7;
a liquid level regulating valve 2 is arranged at the bottom of the buffer tank (VZ-01);
a fifth regulating valve 5 is arranged between the front end of a regeneration gas inlet pipeline and a stop valve V5, the stop valve V4 is connected with a buffer tank (VZ-01), and the buffer tank (VZ-01) is sequentially connected with a purge gas pipeline stop valve V26;
the cut-off valve V2 is sequentially connected with the second filter (FP-02), the air cooler (EA-01) and the third regulating valve 3;
a heat exchanger (ES-001), a fourth regulating valve 4 and a heating furnace (EF-01) are sequentially arranged on a regeneration gas inlet pipeline, the heating furnace (EF-01) is connected with a cut-off valve V6, and the cut-off valve V1, a first filter (FP-01), the heat exchanger (ES-001), an air cooler (EA-01) and a third regulating valve 3 are sequentially connected;
a regeneration gas supply line cut-off valve V25 is provided between the fifth regulating valve 5 and the surge tank (VZ-01).
The process adopts three-tower process, one-tower adsorption, one-tower regeneration and one-tower cooling. The adsorption time is 12h, the emptying and purging are carried out for 1h, the regeneration is 12h, the cold blowing is carried out for 10h, and the loading is carried out for 1 h. The switching of each absorption tower in the above state is realized by switching the valve group, and the switching logic is automatically controlled by DCS. The operation state and cycle time of each absorption column are as shown in FIG. 2.
The whole circulation process is illustrated by taking an adsorption tower CD-01 as an example: liquid charging, adsorption, evacuation, purging, regeneration and cold blowing. The whole process lasts for 36 h.
Firstly, the method comprises the following steps: adsorption phase
The natural gas condensate (P is 1.7MPa, T is 35 ℃, F is 90000kg/h, and the specific components are as shown in fig. 3, the natural gas condensate, the treated condensate and the regenerated gas) enters the adsorption tower CD-01 from the bottom of the tower after being regulated by the flow regulating valve 1.
For the adsorption tower CD-01, the bottom stock NGL inlet cut-off valve V3 and the top stock NGL inlet valve V7 are opened at the stage, and other cut-off valves related to the adsorption tower are all in a closed state. The natural gas condensate enters an adsorption tower CD-01 from bottom to top through a raw material NGL inlet shut-off valve V3 at the bottom of the tower, and a molecular sieve in the tower physically adsorbs sulfide and other impurities in the natural gas condensate, wherein the adsorption time is 12 hours.
The treated natural gas condensate (P1.65 MPa, T35 ℃, F90000 kg/h) flows out from the top of the tower through V7, and molecular sieve dust particles possibly carried in the condensate are filtered out through a filter FP-03 and then sent to a downstream device, and the components of the treated natural gas condensate product (P1.6 MPag, T35 ℃, total sulfur <5ppm) are shown in fig. 3.
II, secondly: emptying phase
After the adsorption stage is completed, the NGL in the adsorption column must be evacuated before the molecular sieve is regenerated. The emptying is carried out with natural gas (P4.2 MPag, T30 ℃) which has a higher pressure than the natural gas condensate, it being possible for other inert gases such as N to be used2. At this stage, the cut-off valve V4 (bottom drain to the loading and unloading tank line) and the cooling gas cut-off valve V5 (top cooling gas inlet) are opened, and the other cut-off valves related to the column are all closed to discharge the condensate of the adsorption column to the buffer tank (VZ-01). During the liquid discharge operation, a shut-off valve V26 (a regeneration gas line to a loading/unloading tank branch line) on the NGL loading/unloading tank is opened, and the pressure of the gas generated in the buffer tank (VZ-01) is adjusted by a pressure adjusting valve and then supplied to a regeneration gas main pipe, while the pressure in the hydrocarbon liquid loading/unloading tank is maintained at a constant value (P ═ 4.0 MPag).
Thirdly, the method comprises the following steps: purging stage
After the condensed liquid in the adsorption tower is exhausted, a shut-off valve V4 (discharging liquid from the tower bottom to a loading and unloading tank pipeline) and a shut-off valve V26 (discharging liquid from the tower bottom to a loading and unloading tank branch line) on an NGL loading/unloading tank are closed, a cooling gas shut-off valve V5 (a cooling gas inlet at the tower top) is continuously kept in an open state, a shut-off valve V2 (a cooling gas outlet at the tower bottom) is opened, and a bed is purged for about 30min by cold blowing gas (P is 4.2MPag, T is 30 ℃, F is 7000kg/h) so as to remove residual NGL liquid remained in the bed. The purge gas enters from the top of the adsorption tower, the purge gas enters into a cooling gas filter (FP-02) after coming out from the bottom of the adsorption tower, switching operation is carried out after the front-back pressure difference of the filter is high, and the natural gas condensate collected by the filter in the process of ventilation operation is discharged to a natural gas condensate main pipe.
Fourthly, the method comprises the following steps: regeneration phase
1) The regeneration gas (P is 4.2MPag, T is 150-300 deg.C, F is 7000kg/h) used in the regeneration process exchanges heat with the heat exchanger ES-001, and enters the regeneration tower for regeneration after being heated by the heating furnace EF-01, and the regeneration time is 12 h. In the regeneration process, the temperature of the regeneration gas is adjusted according to the temperature requirement of the molecular sieve for regeneration and impurity removal. Taking the regeneration of the molecular sieve for removing methanol and mercaptan as an example, the regeneration temperature requirements are as follows:
(1) the temperature at the start of the regeneration cycle was 150 ℃.
(2) The temperature of the EF-01 outlet of the heating furnace is maintained at 150 ℃ for 1.5 h. The possibility of coking due to decomposition of methanol at high temperatures is minimized and molecular sieve aging and water condensation are avoided.
(3) The temperature at the outlet of the heating furnace was raised to 300 ℃ at a rate of 5 ℃/min.
(4) The outlet temperature of the heating furnace is maintained at 300 ℃ for 9.5h, so that the mercaptan is fully removed from the bed layer.
(5) After the regeneration cycle is finished, the temperature of the outlet of the heating furnace is reduced to 150 ℃ at the cooling rate of 5 ℃/min.
The inlet and outlet temperatures of the regeneration process column as a function of regeneration time are shown in FIG. 4.
2) In the regeneration process, a cooling gas cut-off valve V5 (a tower top cooling gas inlet) and a cut-off valve V2 (a tower bottom cooling gas outlet) are closed, a regeneration gas inlet cut-off valve (V6) and a regeneration gas outlet cut-off valve (V1) are opened, and hot regeneration gas enters the tower from the top through the regeneration gas inlet cut-off valve (V6).
3) The regenerated regeneration gas leaves the adsorption tower from the bottom of the tower through a regeneration gas outlet shut-off valve (V1) and enters a regeneration gas filter (FP-01) to be filtered to remove solid impurities.
4) The regeneration gas (P4.0 MPag, T150-.
Fifthly: cold blowing stage
And after the regeneration is finished, entering a cold blowing stage.
In the first step, after the adsorbent is completely regenerated, the regeneration gas inlet shutoff valve (V6) and the regeneration gas outlet shutoff valve (V1) are closed, the cooling gas shutoff valve V5 (top cooling gas inlet) and the shutoff valve V2 (bottom cooling gas outlet) are opened, and cold blowing gas (P ═ 4.2MPag, T ═ 30 ℃, F ═ 7000kg/h) is directly introduced into the adsorption tower CD-01. The cold blowing process lasts for 10 hours;
secondly, cold blowing air enters a cooler filter FP-02 through a first dehydration tower to remove molecular sieve dust carried by the cold blowing air;
and thirdly, cold blow air enters an air cooler EA-01 through a cooler filter FP-02 to exchange heat (P is 4.0MPag, T is 45 ℃, and F is 7000kg/h) and then enters a downstream device.
Sixthly, the method comprises the following steps: filling (loading) phase
At the end of the cooling cycle, the dump valves V2 and V5 are closed, the dump valves V4 and V8 are opened, and NGL charging operation is performed on the adsorption column by reversing the NGL unloading line. The NGL in the NGL loading/unloading tank is replaced into the adsorption column CD-01 by the cooling gas through a shut-off valve V25 on the regeneration gas supply line.
After completion of the topping up operation, valves V4 (bottom drain to the loading vessel line), V25 (on the regeneration gas supply line) and V8 (on the vent line) were closed.
Claims (10)
1. A molecular sieve adsorption unit for handling natural gas condensate which characterized in that: including at least a set of adsorption tower, buffer tank, heat exchanger, heating furnace and air cooler, wherein: each group of adsorption towers comprises at least two towers which are arranged between a natural gas condensate inlet pipeline and a treated natural gas condensate outlet pipeline in parallel, and the bottom and the top of each tower are respectively provided with four cut-off valves V1-V4 and V5-V8; a dust particle filter is arranged between the tail end of the treated natural gas condensate outlet pipeline and a shut-off valve V7; the shut-off valve V4 is connected with the buffer tank; the cut-off valve V2 is sequentially connected with the cooling gas filter and the air cooler; set gradually heat exchanger, heating furnace on the regeneration gas import pipeline, the heating furnace is connected with trip valve V6, and trip valve V1, regeneration gas filter, heat exchanger, air cooler connect gradually.
2. A molecular sieve adsorption unit for treating natural gas liquids according to claim 1, wherein: and a first regulating valve is arranged between the front end of the natural gas condensate inlet pipeline and the stop valve V3.
3. A molecular sieve adsorption unit for treating natural gas liquids according to claim 2, wherein: and a second liquid level regulating valve is arranged at the bottom of the buffer tank.
4. A molecular sieve adsorption unit for treating natural gas liquids according to claim 3, wherein: the air cooler is connected with the third regulating valve, the buffer tank is connected with regeneration gas pipeline trip valve V25, purge gas pipeline trip valve V26 in proper order.
5. A molecular sieve adsorption unit for treating natural gas liquids according to claim 4, wherein: and a fourth regulating valve is arranged between the heat exchanger and the heating furnace.
6. A molecular sieve adsorption unit for treating natural gas liquids according to claim 5, wherein: a fifth regulating valve is provided between the front end of the regeneration gas inlet line and the cut-off valve V5.
7. A molecular sieve adsorption process for treating natural gas condensate, characterized by: adopting at least two-tower flow, when adopting two towers, one tower is used for adsorption, one tower is used for regeneration and cooling; when three towers are adopted, one tower is used for adsorption, one tower is used for regeneration, and one tower is used for cooling, wherein:
firstly, an adsorption stage:
opening the cut-off valves V3 and V7, keeping other cut-off valves in a closed state, enabling the natural gas condensate to enter the adsorption tower from bottom to top through the inlet cut-off valve V3, enabling the molecular sieve in the tower to physically adsorb sulfide and other impurities in the natural gas condensate, enabling the adsorption time to be 12 hours, enabling the treated natural gas condensate to flow out of the tower top through the cut-off valve V7, filtering the natural gas condensate through a dust particle filter, and then enabling the treated natural gas condensate to flow to a downstream device;
II, an emptying stage:
after the adsorption stage is finished and before the molecular sieve is regenerated, opening the cut-off valves V5 and V4, wherein other cut-off valves are in a closed state, discharging condensate of the adsorption tower to a buffer tank by using cooling gas at the top of the tower, opening a branch line cut-off valve V26 of an NGL loading and unloading tank during liquid discharge operation, and outputting gas generated by the buffer tank to a main regenerated gas pipe after the pressure of the gas is regulated by a pressure regulating valve;
thirdly, purging:
after the condensate in the adsorption tower is drained, closing the stop valve V4 and the NGL loading and unloading tank branch line stop valve V26, continuously keeping the stop valve V5 in an open state, opening the stop valve V2, and blowing the bed layer with cold blowing gas for 30min to remove residual NGL liquid remained in the bed layer; the purge gas enters a cooling gas filter after coming out of the bottom of the adsorption tower;
fourthly, a regeneration stage:
the regeneration gas exchanges heat through a heat exchanger, enters a regeneration tower for regeneration after being heated by a heating furnace, the regeneration time is 12 hours, shut valves V5 and V2 are closed in the regeneration process, shut valves V6 and V1 are opened, hot regeneration gas enters the tower from the top through V6, the regenerated regeneration gas leaves the regeneration tower from the tower bottom through a shut valve V1, enters a regeneration gas filter for filtering to remove solid impurities, is mixed with the cold-blown return regeneration gas after heat exchange through the heat exchanger, and then enters a downstream device after being cooled by an air cooler;
fifthly, cold blowing stage:
after the adsorbent is completely regenerated, closing the stop valves V6 and V1, opening the stop valves V5 and V2, directly feeding cold blow gas into the cooling tower, wherein the cold blow process lasts for 10 hours, and feeding the cold blow gas discharged from the cooling tower into an air cooler for heat exchange after removing entrained molecular sieve dust through a cooler filter and then into a downstream device;
sixthly, liquid filling stage:
after the cold blowing stage is finished, closing the cut-off valves V2 and V5, opening the cut-off valve V4, carrying out NGL liquid filling operation on the adsorption tower through the reverse operation of an NGL unloading line, replacing the NGL in the buffer tank into the adsorption tower through the cut-off valve V25 on a regenerated gas supply line by cooling gas, opening the cut-off valve V8 in the liquid filling operation of the adsorption tower, and closing V4, V25 and V8 after the liquid filling operation is finished.
8. A molecular sieve adsorption process for treating natural gas liquids according to claim 7, characterized by: the emptying stage employs natural gas or other inert gas at a pressure higher than the natural gas condensate.
9. A molecular sieve adsorption process for treating natural gas liquids according to claim 7, characterized by: and switching operation is carried out after the front and back pressure difference of the cooling gas filter is high, and the natural gas condensate collected in the ventilation operation process is discharged to the natural gas condensate main pipe.
10. A molecular sieve adsorption process for treating natural gas liquids according to claim 7, characterized by: in the regeneration process, the temperature of the regeneration gas is regulated according to the temperature requirement of the molecular sieve for regeneration and impurity removal:
(1) the temperature at the beginning of the regeneration cycle was 150 ℃;
(2) the outlet temperature of the heating furnace is maintained at 150 ℃ for 1.5 h;
(3) the outlet temperature of the heating furnace is increased to 300 ℃ at the speed of 5 ℃/min;
(4) the outlet temperature of the heating furnace is maintained at 300 ℃ for 9.5 h;
(5) after the regeneration cycle is finished, the temperature of the outlet of the heating furnace is reduced to 150 ℃ at the cooling rate of 5 ℃/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195042A (en) * | 2020-08-19 | 2021-01-08 | 中冶南方都市环保工程技术股份有限公司 | Blast furnace gas desulfurization device and desulfurization method |
| CN113970270A (en) * | 2021-10-27 | 2022-01-25 | 中国核动力研究设计院 | Multi-regenerative heat exchanger combination device and operation control method |
| CN114740118A (en) * | 2022-04-21 | 2022-07-12 | 云南电网有限责任公司电力科学研究院 | Analysis method of decomposition product of organic hydrogen storage material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112195042A (en) * | 2020-08-19 | 2021-01-08 | 中冶南方都市环保工程技术股份有限公司 | Blast furnace gas desulfurization device and desulfurization method |
| WO2022037204A1 (en) * | 2020-08-19 | 2022-02-24 | 中冶南方都市环保工程技术股份有限公司 | Blast furnace gas desulfurization apparatus and method |
| CN113970270A (en) * | 2021-10-27 | 2022-01-25 | 中国核动力研究设计院 | Multi-regenerative heat exchanger combination device and operation control method |
| CN113970270B (en) * | 2021-10-27 | 2023-07-25 | 中国核动力研究设计院 | Combined device of multiple regenerative heat exchangers and operation control method |
| CN114740118A (en) * | 2022-04-21 | 2022-07-12 | 云南电网有限责任公司电力科学研究院 | Analysis method of decomposition product of organic hydrogen storage material |
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