CN105749697A - Dehydration tower optimization control method for molecular sieve dehydration device - Google Patents
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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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- 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
- B01D53/0454—Controlling adsorption
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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
- B01D53/26—Drying gases or vapours
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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
- B01D53/26—Drying gases or vapours
- B01D53/28—Selection of materials for use as drying agents
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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
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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
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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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
- B01D2259/403—Further details for adsorption processes and devices using three beds
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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
- B01D2259/404—Further details for adsorption processes and devices using four beds
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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
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
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Abstract
The invention discloses a dehydration tower optimization control method for a molecular sieve dehydration device. The method comprises the following steps: adopting an automatic time sequence control mode of a single tower, manually setting switching time, and executing main program switching according to the steps of changing original cooling into adsorbing, changing original adsorbing into regenerating and changing original regenerating into cooling; ensuring that one of four towers is positioned in a cooling state, two towers are positioned in an adsorbing state and one tower is positioned in a regenerating state before switching; switching after the first switch waiting time T1 according to a sequence of adsorbing in an original cooling tower, regenerating in an original adsorbing tower and cooling in an original regenerating tower, wherein at the moment, one of the original two adsorbing towers, exiting from a switching program, is turned into an overhauling and maintenance state; waiting according to normal switching time T2 after first switching completion, and performing the next three-tower switching. According to the method disclosed by the invention, the economical efficiency and adaptability of use of the molecular sieve dehydration device can be greatly improved, and the process operating efficiency is improved. Identification of an operating state of the molecular sieve tower is added, so that an operator can conveniently eliminate failure and rapidly restore production.
Description
Technical field
The invention belongs to oil and gas industry molecular sieve dehydration device Auto-control of the process technical field, be specifically related to molecular sieve tower and initialize and method for handover control.
Background technology
Molecular sieve is artificial synthetic zeolite, is highly polar adsorbent, polarity, unsaturated compound and easy polar molecule (particularly water) is had very big affinity, therefore according to molecular polarity, degree of unsaturation and space structure are different, unstripped gas can be easily separated.Molecular sieve heat stability, chemical stability are high, have again the microchannel of many uniform pore diameter and the cavity of marshalling, the big (800～1000m of its specific surface area2/ g), and only allow the molecule that diameter is less than its aperture to enter micropore.Water is adsorbed with good selectivity by molecular sieve, it is achieved thereby that the separating of water and raw natural gas.
Technical process is summarized as follows:
From upstream device come unstripped gas, remove through wet purification gas coalescer and after the water droplet carried secretly, enter molecular sieve water separation tower.Unstripped gas carries out dehydration adsorption process.Purge gas after elimination water is delivered to downstream line by gas product dust filter unit.
Drawing a part from gas product pipeline or unstripped gas pipeline as cooling gas, cooling gas passes through the molecular sieve water separation tower just completing regenerative process, to cool down this tower.
Cooling gas enters regeneration gas heating furnace after going out tower, heats after 200 to 300 DEG C as lean regeneration gas, and lean regeneration gas by just completing the molecular sieve water separation tower of adsorption process, to heat mol sieve beds, makes the water desorption of absorption and enters in regeneration gas from bottom to top.Regeneration gas outlet temperature reaches 240 to 280 DEG C, and stablizes 20min and be considered as regenerative process.
Owing to natural gas molecular sieve dehydrating technology category is various, the valve that each molecular sieve water separation tower need to control at least includes absorption valve group, regeneration valve group, cooling valve group, the valve that some molecular sieve towers also include low pressure regeneration pressure-control valve group, device domestic demand controls in handoff procedure comprises reheater on off control or cold blowing valve Bypass Control etc., owing to needing the valve quantity controlled many, cause initialization operation process loaded down with trivial details, program run time error investigation difficulty, after fault, recovering step is complicated.Program is once setting and modifying difficulty, and operating mode, once the original program that changes is difficult in adapt to the demand of various working, needs configuration and debugging again, expends and debugs the time in a large number, causes to onsite application greatly constant.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of molecular sieve dehydration device dehydrating tower optimal control method, there is extremely strong adaptability, the demand that molecular sieve tower is initialized and switches by different molecular sieve dewatering process can be met.
The technical solution adopted in the present invention is: a kind of molecular sieve dehydration device dehydrating tower optimal control method, including following content:
One, single column optimal control: adopting sequential automatic control mode, switching time is manually set, mastery routine switching according to: former cooling changes absorption > former absorption changes regeneration > former regeneration changes the step of cooling and performs；Include switching time first T1 switching time, normal switching time T2 and valve group switching cycle T3；
Two, drop tower operation optimization to control:
4 towers turn the control of 3 towers, guarantee 4 towers have 1 tower (such as A tower) be in the state of cooling before switching, 4 towers there are 2 towers (such as B tower and C tower) be in adsorbed state, 4 towers there is 1 tower (such as D tower) be in reproduced state, absorption is turned according to former cooling tower (such as A tower) after T1 switching time first waiting, former adsorption tower (such as B tower) turns regeneration, former regenerator (such as D tower) turns the order of cooling and switches over, now former 2 absorption adsorption towers there is 1 tower (such as C tower) to exit changeover program and transfer maintenance inspecting state to, after having switched first, by normal T2 wait switching time, then 3 tower switching next time is carried out.
3 towers turn the control of 2 towers, guarantee before switching that having 1 tower (such as A tower) to be in the state of cooling, 3 towers in 3 towers has 1 tower (such as B tower) to be in adsorbed state, 3 towers there is 1 tower (such as C tower) be in reproduced state, turn absorption according to former cooling tower (such as A tower) after waiting T1 switching time first, former adsorption tower (such as B tower) turns the order of re-generatively cooled and switches over, and former regenerator (such as C tower) exits changeover program and proceeds to inspecting state.
Compared with prior art, the method have the advantages that
The molecular sieve single column control method of the present invention adapts in various types of natural gas molecular sieve dehydrating process units, including the switching of isobaric regeneration, blood pressure lowering regeneration technology process molecular sieve tower, it is provided with the control of the molecular sieve dehydration device process valve of cold blowing bypass line, needs the thermals source such as the hot stove of regeneration gas are carried out the dewatering process process of on off control.The present invention proposes that a kind of 4 towers turn 3 towers simultaneously, 3 towers turn that 2 towers run drops tower operation optimization control method, is greatly improved molecular sieve dehydration device its usage economy and adaptability, improves process operation efficiency.The present invention adds molecular sieve tower running state recognition in a program, facilitates operator to fix a breakdown and resumes production rapidly.Concrete manifestation is as follows:
1, adopting unified execution framework, it is thus only necessary to select switching, the initialization being namely suitable for various molecular sieve dehydration device controls with handoff procedure.Substantially increase design and operational efficiency, reduce exploitation and operation easier, improve construction quality.
2, drop tower operation optimization control algolithm, be greatly improved adaptability, safety and economy that molecular sieve dehydration device uses, improve process operation efficiency.
3, add the tower-like state recognizer of molecular sieve in a program, facilitate operator to fix a breakdown and resume production rapidly.
Detailed description of the invention
A kind of molecular sieve dehydration device dehydrating tower optimal control method, including herein below:
One, molecular sieve water separation tower single column optimal control: adopt sequential automatic control mode.Switching time is manually set, no matter adopting which kind of molecular sieve dehydration technique, the switching of its mastery routine all performs according to the following step: former cooling changes absorption > former absorption changes regeneration > former regeneration changes cooling, concrete control process is as follows:
(1) former cooling changes absorption:
When mastery routine sends absorption instruction, during Absorb:=1, require when dehydrating tower is proceeded to absorption mode by refrigerating mode, close cooling valve group, after cooling valve group is closed, open absorption valve group, when cooling valve group valve position signal is in the closed position in an open position with absorption valve group valve position signal, absorption handoff procedure terminates, and the expression symbol that absorption handoff procedure terminates is Absorb_Position:=1.Now mastery routine can enter next step operation.
For adapting to have the molecular sieve dehydration technological process needs that cooling valve Bypass Control requires, this control method has cold blowing bypass valve and controls to select function.When CoolBypass:=1 program performs to open cold blowing bypass valve instruction.After cold blowing bypass valve is opened, program performs absorption instruction.
(2) former absorption changes regeneration:
When mastery routine sends regeneration instructions, require when dehydrating tower is proceeded to regeneration mode by absorption mode, close absorption valve group, after absorption valve group is closed, open regeneration valve group, when absorption valve group valve position signal is in the closed position in an open position with regeneration valve group valve position signal, regeneration handoff procedure terminates, and the expression symbol that regeneration handoff procedure terminates is Regenerate_Position:=1.Now mastery routine can enter next step operation.
For adapting to have the molecular sieve dehydration technological process needs that low pressure regeneration controls to require, this control method has low pressure regeneration and selects function.When DropPressure:=1 program performs reduced pressure operation instruction.After reduced pressure operation instruction has performed, program performs regeneration instructions.Regenerate rear program and perform boost instruction.
For adapting to have the molecular sieve dehydration technological process needs that the thermals source such as heating furnace control to require, this control method has thermal source and controls to select function.Working as HeaterCtrl:=1, program sends heating furnace open command, closes heating furnace after regeneration ending.This instruction can also be used for the control of heating furnace heat bypass.
For adapting to molecular sieve dehydration technological process two tower process requirements of process, this control program has re-generatively cooled and simultaneously completes pattern.In this mode, make Regenerate_to_Cool:=1, program performs dehydrating tower regeneration switching, and regenerative process starts the rear T4 time (recovery time with tower re-generatively cooled), and this dehydrating tower regeneration valve group of stop is opened cooling valve group and automatically proceeded to the function of cooling.
(3) former regeneration changes cooling:
When dehydrating tower is proceeded to refrigerating mode by regeneration mode, close regeneration valve group, after regeneration valve group is closed, open cooling valve group, when regeneration valve group valve position signal is in the closed position in an open position with cooling valve group valve position signal, cooling handoff procedure terminates, and the expression symbol that cooling handoff procedure terminates is Cool_Position:=1.Now mastery routine can enter next step operation.
For adapting to have the molecular sieve dehydration technological process needs that cooling valve Bypass Control requires, this control method has cold blowing bypass valve and controls to select function.When CoolBypass:=1 program performs to close cold blowing bypass valve instruction.After program performs cooling instruction, close cold blowing bypass valve.
Two, drop tower operation optimization to control:
Program first determines whether the running status of each tower (for 3 towers), and molecular sieve water separation tower runs first or dehydrating tower stops and has been adsorbed with certain water in tower after recovering, and after driving, switching time is likely to different from conventional switching time first.For adapting to this operation operating mode, being provided with T1 switching time first in this control method, this step " Time " performs assignment operation.Reaching T1 switching time first between when running, molecular sieve tower starts switching action and performs next step " Absorb ".First program sends Absorb and adsorbs instruction to Tower_A, is 1 status signal when receiving the single column control basic module Tower_A Abosrb_Position sent at valve group switching setting cycle T3 time internal program, then absorption handoff procedure completes.Program proceeds to next step " Regenerate ".If being not fully complete absorption instruction within the valve group switching setting cycle T3 time or now program being by automatically switching to manually, program will move out to manual mode.When program performs regeneration " Regenerate " step, program sends regeneration instructions to Tower_B, is 1 status signal when receiving the single column control module Tower_B Regenerate_Position sent at T3 time internal program, then regeneration handoff procedure completes.Program proceeds to next step " Cool ".If being not fully complete regeneration instructions within the valve group switching setting cycle T3 time or now program being by automatically switching to manually, program will move out to manual mode.Step " Cool " sends cooling instruction to Tower_C, it is 1 status signal when receiving the single column control module Tower_C Cool_Position sent at T3 time internal program, cooling switching completes, if being not fully complete cooling instruction within the T3 time or now program being by automatically switching to manually, program will move out to manual mode.After cooling handoff procedure completes, program proceeds to next step, and program waits the T2 time (T2 is normal switching time).This step " Time " performs assignment operation, can set T2.
Owing to molecular sieve dehydration technique switches working environment harshness residing for valve, valve event is frequent, and internal hemorrhage due to trauma easy to wear causes that molecular sieve dehydration handicraft product gas is defective, re-generatively cooled temperature is defective, affects the accident conditionses such as molecular sieve life-span and occurs, needs parking maintenance.And whole process unit parking maintenance often brings bigger economic loss.This control method provides one and drops tower operation optimization control program, can according to on-the-spot actual demand when whole process unit be not parking, adopt the mode of the molecular sieve water separation tower quantity reducing on-line operation, molecular sieve tower and valve are carried out Maintenance and Repair, remain online molecular sieve water separation tower and according to normal program operation set in advance, the loss that device parking brings can be reduced.
It is as follows that A, B, C, D4 seat molecular sieve water separation tower turns 3 tower operating schemes:
This molecular sieve control method drops tower programme of work according to pre-set 4 kinds of permutation and combination." ABD " scheme, namely " C tower " deactivating proceeds to inspecting state." BCA " scheme, namely " D tower " deactivating proceeds to inspecting state.By that analogy.First original " ABCD " 4 tower running status is exited.Exit to manual mode of operation from automatic operational mode.If service condition Atuo.enable is false automatically, then program exits automatic running status, switches over preparation for dropping tower operation.Operator are actually needed selection according to scene needs the molecular sieve water separation tower of off-line operation to number, and for " ABD " scheme, " C tower " deactivating proceeds to inspecting state.Operator confirm that system puts into automatically and selects " ABD " scheme, program will be run according to " ABD " scheme: when " ABD " scheme is run, program first determines whether the running status of each tower, for guaranteeing correct transfer sequence, the front A tower of switching should be at the state of cooling, B tower and C tower should be at adsorbed state, D tower should be at reproduced state, valve running status confirms according to valve position signal, and program is by each for automatic decision tower running status.After confirming that each tower running status is errorless, program turns absorption according to A tower after waiting T1 switching time first, B tower turns regeneration, D tower turns the order of cooling and switches over, waiting that after switching completes the T2 time switches next time, C tower exits automatic operational mode and proceeds to maintenance model.It is more than that 4 towers turn the principle of 3 tower optimization control scheme and implement step.
3 towers turn 2 tower prioritization schemes and 4 towers to turn 3 tower control program principles consistent, first original running status automatically is exited, operator are actually needed selection according to scene needs the molecular sieve tower of off-line operation to number, " AB " scheme is example, " C tower " deactivating proceeds to inspecting state, operator confirm that system puts into automatically and selects " AB " scheme, program first determines whether the running status of each tower, for guaranteeing correct transfer sequence, before switching, A tower should be at the state of cooling, B tower is in adsorbed state, C tower is in reproduced state, valve running status confirms according to valve position signal, the each tower running status of procedure judges.Then molecular sieve is switched tower operational mode and switches to two tower operational modes by Automatic Program, even A tower and B tower Regenerate_to_Cool:=1.After confirming that each tower running status is errorless, program turns absorption according to A tower after waiting T1 switching time first, B tower turns the order of re-generatively cooled and switches over.Waiting that after switching completes the T2 time switches next time, C tower exits automatic operational mode and proceeds to maintenance model.
Claims (9)
1. a molecular sieve dehydration device dehydrating tower optimal control method, it is characterised in that: include following content:
One, single column optimal control: adopting sequential automatic control mode, switching time is manually set, mastery routine switching according to: former cooling changes absorption > former absorption changes regeneration > former regeneration changes the step of cooling and performs；Include switching time first T1 switching time, normal switching time T2 and valve group switching cycle T3；
Two, drop tower operation optimization to control:
Guarantee to have in 4 towers 1 tower to be in the state of cooling before switching, 2 towers are in adsorbed state, 1 tower is in reproduced state, turn absorption according to former cooling tower after waiting T1 switching time first, former adsorption tower turns regeneration, former regenerator turns the order of cooling and switches over, and now has 1 tower to exit changeover program in former 2 adsorption towers and transfers maintenance inspecting state to；After having switched first, by normal T2 wait switching time, then carry out 3 towers switching next time.
2. molecular sieve dehydration device dehydrating tower optimal control method according to claim 1, it is characterized in that: when former cooling changes absorption, mastery routine sends absorption instruction, dehydrating tower is proceeded to absorption mode by refrigerating mode, after closing cooling valve group, opening absorption valve group, when cooling valve group valve position signal is in the closed position and absorption valve group valve position signal is in an open position, absorption handoff procedure terminates.
3. molecular sieve dehydration device dehydrating tower optimal control method according to claim 2, it is characterized in that: for having the molecular sieve dehydration technological process that cold blowing valve Bypass Control requires, need to first carrying out unlatching cold blowing bypass valve instruction, after cold blowing bypass valve is opened, mastery routine sends absorption instruction again.
4. molecular sieve dehydration device dehydrating tower optimal control method according to claim 1, it is characterized in that: when former absorption changes regeneration, mastery routine sends regeneration instructions, when dehydrating tower is proceeded to regeneration mode by absorption mode, after closing absorption valve group, opening regeneration valve group, when absorption valve group valve position signal is in the closed position and regeneration valve group valve position signal is in an open position, regeneration handoff procedure terminates.
5. molecular sieve dehydration device dehydrating tower optimal control method according to claim 4, it is characterized in that: the molecular sieve dehydration technological process required for having low pressure regeneration to control, reduced pressure operation instruction need to be first carried out, after reduced pressure operation instruction has performed, mastery routine sends regeneration instructions again, and regeneration switching performs boost operations instruction after completing.
6. molecular sieve dehydration device dehydrating tower optimal control method according to claim 4, it is characterised in that: the molecular sieve dehydration technological process required for having thermal source to control, thermal source open command need to be first carried out, regeneration switching closes thermal source after completing.
7. molecular sieve dehydration device dehydrating tower optimal control method according to claim 4, it is characterized in that: for having the molecular sieve dehydration technological process that re-generatively cooled completes with tower, when performing regeneration switching, after first passing through the recovery time T4 of setting, close after regeneration valve group opens cooling valve group and automatically proceed to refrigerating mode.
8. molecular sieve dehydration device dehydrating tower optimal control method according to claim 1, it is characterized in that: when former regeneration changes cooling, mastery routine sends cooling instruction, when dehydrating tower is proceeded to refrigerating mode by regeneration mode, after closing regeneration valve group, opening cooling valve group, when regeneration valve group valve position signal is in the closed position and cooling valve group valve position signal is in an open position, cooling handoff procedure terminates.
9. molecular sieve dehydration device dehydrating tower optimal control method according to claim 1, it is characterized in that: 3 towers are turned to the control of 2 towers, guarantee before switching that in 3 towers, each tower is respectively at the state of cooling, adsorbed state and reproduced state, turn absorption according to former cooling tower after waiting T1 switching time first, former adsorption tower turns the order of re-generatively cooled and switches over, and former regenerator exits changeover program and proceeds to inspecting state.
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Application publication date: 20160713 |