CN105435586A - Liquid level control equipment and method for desulfurizing absorption tower of alcohol-amine desulfurization device - Google Patents
Liquid level control equipment and method for desulfurizing absorption tower of alcohol-amine desulfurization device Download PDFInfo
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- CN105435586A CN105435586A CN201511014156.6A CN201511014156A CN105435586A CN 105435586 A CN105435586 A CN 105435586A CN 201511014156 A CN201511014156 A CN 201511014156A CN 105435586 A CN105435586 A CN 105435586A
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- liquid level
- desulfuration absorbing
- absorbing tower
- level
- absorption tower
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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
- B01D53/14—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 absorption
- B01D53/1412—Controlling the absorption process
-
- 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
- B01D53/14—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 absorption
- B01D53/1456—Removing acid components
- B01D53/1468—Removing hydrogen sulfide
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/204—Amines
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention provides liquid level control equipment for a desulfurizing absorption tower of an alcohol-amine desulfurization device. The liquid level control equipment comprises the desulfurizing absorption tower, an outer float level meter and a differential pressure level transmitter, wherein the upper part and the lower part of the differential pressure level transmitter are mounted in the middle and the bottom of the body of the desulfurizing absorption tower through flanges, and the differential pressure level transmitter is used for detecting the whole liquid level of the desulfurizing absorption tower; the outer float level meter is mounted in the middle of the desulfurizing absorption tower and used for detecting the fluctuating liquid level of the desulfurizing absorption tower; a control valve is arranged on an outlet pipe at the bottom of the desulfurizing absorption tower, and two emergency cut-off valves are arranged sequentially on a pipe between the control valve and the desulfurizing absorption tower; three tuning fork liquid level switches are arranged at the bottom of the desulfurizing absorption tower. According to a desulfurizing absorption liquid level control method, not only is stable control of the liquid level during normal operation of the desulfurizing absorption tower guaranteed, but also amine liquor is cut off timely, safely and urgently in case of emergency, high-pressure natural gas is prevented from sneaking into a low-pressure amine liquor regeneration system, and the reliability of safe operation of the desulfurization device is improved greatly.
Description
Technical field
The present invention relates to a kind of desulfuration absorbing tower level control device and method thereof of alcohol amine desulfilrization unit.
Background technology
Natural gas, as a kind of clean energy resource, uses more and more extensive.But the natural gas that underground is directly exploited, due to usually containing extremely toxic substance hydrogen sulfide and water, CO2, lighter hydrocarbons etc., directly can not be given user and use, need the requirement that just can reach commodity gas after purification.Processing medium involved by Gas Purification Factory is sulfur-containing gas, desulfurization solvent, dehydrated solvent, acid gas and molten sulfur etc. mainly.Wherein raw natural gas belongs to inflammable, explosive toxic gas, the H in acid gas
2s content is higher, belongs to extremely toxic substance.Once these processing mediums leak, the heavy losses of personnel, economy, environment may be caused, form serious accident.Gas Purification Factory sulfur-containing gas flows from the bottom to top in desulfuration absorbing tower, and desulfurization solvent lean solution is from tower top toward current downflow, and desulfuration solution absorbs the H contained by it when fully contacting with sulfur-containing gas
2s, then discharges, and removes H at the bottom of tower
2purified natural gas after S is discharged from tower top.Whole process completes under the environment of high pressure.
Selexol process process is breakneck, the equipment under high pressure and pipeline slightly problem, just likely causes high-pressure medium to scurry into low-voltage equipment, causes the serious accident such as low-voltage equipment and line burst, poisonous medium leakage and casualties to occur.
Summary of the invention
In order to ensure the safety of selexol process production process, the invention provides a kind of desulfuration absorbing tower level control device and method thereof of alcohol amine desulfilrization unit.Liquid level and in emergency circumstances liquid level chain cut-out strategy when specifically desulfuration absorbing tower is normally produced, it can improve production security further.Liquid level adjusting valve be arranged on poor rich liquid heat exchanger after rich solution enter regenerator place, cause the corrosion of heat transmission equipment with the flash distillation of sour gas after avoiding control valve throttling.
The technical solution used in the present invention is:
A kind of desulfuration absorbing tower level control device of alcohol amine desulfilrization unit, comprise desulfuration absorbing tower, outer float level meter and differential pressure liquid level transmitter, described differential pressure liquid level transmitter to be arranged in the middle part of desulfuration absorbing tower tower body down through flange and bottom for detecting the overall liquid level of desulfuration absorbing tower; Outer float level meter is arranged on the middle part of desulfuration absorbing tower for detecting desulfuration absorbing tower fluctuation liquid level; Outlet line bottom desulfuration absorbing tower is provided with control valve, the pipeline between control valve and desulfuration absorbing tower is disposed with two quick action emergency valves; Be provided with three Fork LIquid Level Switch bottom desulfuration absorbing tower, each Fork LIquid Level Switch is all connected with liquid level alarm and connects, liquid level alarm is electrically connected with two stop valves; Outer float level transducer is electrically connected with liquid-level indicating controller, and liquid-level indicating controller is electrically connected with control valve.
Three described Fork LIquid Level Switch are all arranged on the diverse location of desulfuration absorbing tower bottom near desulfuration absorbing tower bottom sustained height, for detecting desulfuration absorbing tower lower bound alarm liquid level.
Described quick action emergency valve adopts two pneumatic cut-off valve to arrange.
Described differential pressure liquid level transmitter measures the large measurement range with outer float level transducer of range.
A kind of desulfuration absorbing tower liquid level controlling method of alcohol amine desulfilrization unit, desulfuration absorbing tower bottom is provided with three Fork LIquid Level Switch, when the liquid level that three Fork LIquid Level Switch monitor has two positions lower than three Fork LIquid Level Switch places at least, when namely there is lower bound liquid level warning, chain cut-out amine liquid outlet stop valve, ensures that desulfuration absorbing tower liquid level is in home.
Beneficial effect of the present invention is:
The invention provides a kind of desulfuration absorbing tower level control device and method thereof of alcohol amine desulfilrization unit.Liquid level and in emergency circumstances liquid level chain cut-out strategy when specifically desulfuration absorbing tower is normally produced, it can improve production security further.Liquid level adjusting valve be arranged on poor rich liquid heat exchanger after rich solution enter regenerator place, cause the corrosion of heat transmission equipment with the flash distillation of sour gas after avoiding control valve throttling.
Adopt the outer float level meter of the checkout equipment of different principle and differential pressure levelmeter to detect liquid level, ultralow level chain protection test point is set simultaneously.
Liquid level adjusting valve be arranged on poor rich liquid heat exchanger after rich solution enter regenerator place, cause the corrosion of heat transmission equipment with the flash distillation of sour gas after avoiding control valve throttling.
Be further detailed below with reference to accompanying drawing.
Accompanying drawing explanation
Fig. 1 is desulfuration absorbing tower Liquid level of the present invention and the protection schematic diagram that transfinites.
In figure, Reference numeral: 1, differential pressure liquid level transmitter; 2, desulfuration absorbing tower; 3, outer float level transducer; 4, Fork LIquid Level Switch; 5, liquid level alarm; 6, quick action emergency valve; 7, liquid-level indicating controller; 8, control valve.
Detailed description of the invention
Embodiment 1:
In order to ensure the safety of selexol process production process, the invention provides desulfuration absorbing tower level control device and the method thereof of a kind of alcohol amine desulfilrization unit as shown in Figure 1.Liquid level and in emergency circumstances liquid level chain cut-out strategy when specifically desulfuration absorbing tower is normally produced, it can improve production security further.Liquid level adjusting valve be arranged on poor rich liquid heat exchanger after rich solution enter regenerator place, cause the corrosion of heat transmission equipment with the flash distillation of sour gas after avoiding control valve throttling.
A kind of alcohol amine desulfilrization unit, comprises desulfuration absorbing tower 2, outer float level meter 3 and differential pressure liquid level transmitter 1, described differential pressure liquid level transmitter 1 be arranged in the middle part of desulfuration absorbing tower 2 tower body down through flange and bottom for detecting the overall liquid level of desulfuration absorbing tower; Outer float level meter 3 is arranged on the middle part of desulfuration absorbing tower 2 for detecting desulfuration absorbing tower fluctuation liquid level; Outlet line bottom desulfuration absorbing tower 2 is provided with control valve 8, the pipeline between control valve 8 and desulfuration absorbing tower 2 is disposed with two quick action emergency valves 6; Be provided with three Fork LIquid Level Switch 4 bottom desulfuration absorbing tower 2, each Fork LIquid Level Switch 4 be all connected with liquid level alarm 5 and connect, liquid level alarm 5 is electrically connected with two stop valves 6; Outer float level transducer 3 is electrically connected with liquid-level indicating controller 7, and liquid-level indicating controller 7 is electrically connected with control valve 8.
The general about 4min of the liquid storage time of staying at the bottom of desulfuration absorbing tower 2 tower, when keeping liquid level at the bottom of absorption tower, the change of technical process, as the hydrops amount on the loss of solution, absorption tower and regenerator tower tray increase, the change etc. of the concentration of solution all can cause regenerator liquid level to change, and liquid level at the bottom of regenerator is uncontrollable, so regenerator will leave enough spaces and the time of staying as buffering.
Described outer float level transducer 3 is arranged on desulfuration absorbing tower 2 middle and lower part, for detecting fluctuation liquid level when desulfuration absorbing tower 2 is normally produced, liquid level regulable control loop is formed with control valve 8, control rich amine solution outlet regulating valve opening size according to outer float level transducer level sensing value, liquid level is remained in normal range (NR).
Desulfuration absorbing tower 2 bottom is provided with three Fork LIquid Level Switch 4, when the liquid level that three Fork LIquid Level Switch 4 monitor has two positions lower than three Fork LIquid Level Switch 4 places at least, when namely there is lower bound liquid level warning, chain cut-out amine liquid outlet stop valve 6, ensures that desulfuration absorbing tower 2 liquid level is in home.Liquid level adjusting valve 8 be arranged on poor rich liquid heat exchanger after rich solution enter regenerator place, cause the corrosion of heat transmission equipment with the flash distillation of sour gas after avoiding control valve 8 throttling.The outer float level transducer 3 of employing different principle and differential pressure liquid level transmitter 1 are for the continuous level sensing of desulfuration absorbing tower, and outer float level transducer 3 forms liquid level regulating loop with control valve 8.Differential pressure liquid level transmitter 1 is as subsidiary.
Outer float level transducer 3 is not subject to the impact of tolerance and level fluctuation, can follow the tracks of transient changing fast, can show liquid level average effect again, good stability, and precision be high, be suitable as very much Liquid level instrumentation.
Adopt cage type regulating valve as the Liquid level adjusting valve 8 on rich solution pipeline at the bottom of desulfuration absorbing tower, because of rich solution corrosion and wash away, absorb the damage that the reasons such as the release of gas easily cause control valve after throttling, cage type regulating valve separates because of sealing surface when normal throttling passage is closed with valve, the tight performance of closedown of valve is good, can double as interlocking and cut off use.
Embodiment 2:
On basis based on embodiment 1, the Fork LIquid Level Switch of three described in the present embodiment 4 is all arranged on the diverse location of desulfuration absorbing tower 2 bottom near desulfuration absorbing tower 2 tower bottom sustained height, for detecting desulfuration absorbing tower lower bound alarm liquid level.Realize desulfuration absorbing tower 2 ultra-low limit level chain, when there is lower bound liquid level warning, emergency cut-off amine liquid goes out head emergent cut-off valve 6.
Described quick action emergency valve 6 adopts two pneumatic cut-off valve to arrange.
Amine liquid goes out head emergent cut-off valve 6 and adopts two block valve to arrange.The supporting executing agency of quick action emergency valve 6 needs to make valve be in default home fast, therefore adopts single-acting pneumatic actuator.For improving valve reliability, redundancy solenoid control can be adopted.
Described differential pressure liquid level transmitter 1 measures the large measurement range with outer float level transducer 3 of range.Fluid level transmitter in the present embodiment comprises differential pressure liquid level transmitter 1 and outer float level transducer 3; The outer float level transducer 3 of employing different principle and differential pressure liquid level transmitter 1 are for the continuous level sensing of desulfuration absorbing tower, and outer float level transducer 3 forms liquid level regulating loop with control valve 8.Differential pressure liquid level transmitter 1 is as subsidiary.
Embodiment 3:
On basis based on above-mentioned two embodiments, a kind of desulfuration absorbing tower liquid level controlling method is provided in the present embodiment, desulfuration absorbing tower 2 bottom is provided with three Fork LIquid Level Switch 4, when the position of the liquid level having at least two Fork LIquid Level Switch 4 to monitor lower than place, when namely there is lower bound liquid level warning, chain cut-out amine liquid goes out head emergent cut-off valve 6, ensures that desulfuration absorbing tower 2 liquid level is in home.
As shown in Figure 1, first embodiment of the present invention desulfuration absorbing tower liquid level be ensure desulfurizer run well major parameter, should note following some:
1. the general about 4min of the liquid storage time of staying at the bottom of absorption tower, when keeping liquid level at the bottom of absorption tower, the change of technical process, as the hydrops amount on the loss of solution, absorption tower and regenerator tower tray increase, the change etc. of the concentration of solution all can cause regenerator liquid level to change, and liquid level at the bottom of regenerator is uncontrollable, so regenerator will leave enough spaces and the time of staying as buffering.
2. adopt the outer float level meter of the checkout equipment of different principle and differential pressure levelmeter to detect liquid level, ultralow level chain protection test point is set simultaneously.
3. the Liquid level adjusting valve 8 on rich solution pipeline at the bottom of absorption tower selects cage type regulating valve.
4. control valve 8 be arranged on poor rich liquid heat exchanger after rich solution enter regenerator place, cause the corrosion of heat transmission equipment with the flash distillation of sour gas after avoiding control valve throttling.
If desulfuration absorbing tower ultra-low limit level chain.When there is lower bound liquid level alarm, emergency cut-off amine liquid outlet stop valve 6.Fork LIquid Level Switch 4 is selected to detect desulfuration absorbing tower 2 lower bound liquid level.Three Fork LIquid Level Switch 4 are all arranged at the bottom of desulfuration absorbing tower tank.
Amine liquid outlet stop valve 6 adopts two block valve to arrange.The supporting executing agency of block valve 6 needs to make valve be in default home fast, therefore adopts single-acting pneumatic actuator.For improving valve reliability, redundancy solenoid control can be adopted.
When three Fork LIquid Level Switch 4 have two to report to the police, two stop valves 6 of chain cut-out amine liquid outlet, or turn off this valve according to the full factory program of stopping in emergency.Arrange two stop valves 6 normally to use in order to one, another is for subsequent use.
Claims (5)
1. the desulfuration absorbing tower level control device of an alcohol amine desulfilrization unit, it is characterized in that: comprise desulfuration absorbing tower (2), outer float level meter (3) and differential pressure liquid level transmitter (1), described differential pressure liquid level transmitter (1) to be arranged in the middle part of desulfuration absorbing tower (2) tower body down through flange and bottom for detecting the overall liquid level of desulfuration absorbing tower; Outer float level meter (3) is arranged on the middle part of desulfuration absorbing tower (2) for detecting desulfuration absorbing tower fluctuation liquid level; The outlet line of desulfuration absorbing tower (2) bottom is provided with control valve (8), the pipeline between control valve (8) and desulfuration absorbing tower (2) is disposed with two quick action emergency valves (6); Desulfuration absorbing tower (2) bottom is provided with three Fork LIquid Level Switch (4), and each Fork LIquid Level Switch (4) is all connected with liquid level alarm (5) and connects, liquid level alarm (5) is electrically connected with two stop valves (6); Outer float level transducer (3) is electrically connected with liquid-level indicating controller (7), and liquid-level indicating controller (7) is electrically connected with control valve (8).
2. the desulfuration absorbing tower level control device of a kind of alcohol amine desulfilrization unit according to claim 1, it is characterized in that: three described Fork LIquid Level Switch (4) are all arranged on the diverse location of desulfuration absorbing tower (2) bottom near desulfuration absorbing tower (2) tower bottom sustained height, for detecting desulfuration absorbing tower lower bound alarm liquid level.
3. the desulfuration absorbing tower level control device of a kind of alcohol amine desulfilrization unit according to claim 1, is characterized in that: described quick action emergency valve (6) adopts two pneumatic cut-off valve to arrange.
4. the desulfuration absorbing tower level control device of a kind of alcohol amine desulfilrization unit according to claim 1, is characterized in that: described differential pressure liquid level transmitter (1) measures the large measurement range with outer float level transducer (3) of range.
5. the desulfuration absorbing tower level control device of any one alcohol amine desulfilrization unit according to claim 1-4, a kind of desulfuration absorbing tower liquid level controlling method of alcohol amine desulfilrization unit is provided, it is characterized in that: desulfuration absorbing tower (2) bottom is provided with three Fork LIquid Level Switch (4), when having at least two Fork LIquid Level Switch (4) to monitor the position of liquid level lower than place, namely there is lower bound liquid level warning, chain cut-out amine liquid goes out head emergent cut-off valve (6), ensures that desulfuration absorbing tower (2) liquid level is in home.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511014156.6A CN105435586A (en) | 2015-12-31 | 2015-12-31 | Liquid level control equipment and method for desulfurizing absorption tower of alcohol-amine desulfurization device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511014156.6A CN105435586A (en) | 2015-12-31 | 2015-12-31 | Liquid level control equipment and method for desulfurizing absorption tower of alcohol-amine desulfurization device |
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| CN105435586A true CN105435586A (en) | 2016-03-30 |
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| CN201511014156.6A Pending CN105435586A (en) | 2015-12-31 | 2015-12-31 | Liquid level control equipment and method for desulfurizing absorption tower of alcohol-amine desulfurization device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107875833A (en) * | 2017-12-29 | 2018-04-06 | 西安长庆科技工程有限责任公司 | It is a kind of that automatic cycle, discharge opeing and the system of fluid infusion are realized based on desulfuration absorbing tower |
| CN107930372A (en) * | 2017-12-29 | 2018-04-20 | 西安长庆科技工程有限责任公司 | A kind of integrated device and methods for using them based on triazine solution desulfurization |
| CN113588040A (en) * | 2021-07-30 | 2021-11-02 | 中国石油天然气股份有限公司 | Pressure measuring device, liquid level measuring system, interlocking protection system and method |
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