CN117603744A - Automatic natural gas desulfurization system - Google Patents
Automatic natural gas desulfurization system Download PDFInfo
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- CN117603744A CN117603744A CN202410094678.4A CN202410094678A CN117603744A CN 117603744 A CN117603744 A CN 117603744A CN 202410094678 A CN202410094678 A CN 202410094678A CN 117603744 A CN117603744 A CN 117603744A
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- desulfurization
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- carbon dioxide
- lean
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 128
- 230000023556 desulfurization Effects 0.000 title claims abstract description 128
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000003345 natural gas Substances 0.000 title claims abstract description 32
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 132
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 66
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 66
- 239000006260 foam Substances 0.000 claims abstract description 47
- 238000007405 data analysis Methods 0.000 claims abstract description 43
- 238000004458 analytical method Methods 0.000 claims abstract description 28
- 230000003009 desulfurizing effect Effects 0.000 claims description 43
- 239000003795 chemical substances by application Substances 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 30
- 238000012544 monitoring process Methods 0.000 claims description 23
- 230000008929 regeneration Effects 0.000 claims description 12
- 238000011069 regeneration method Methods 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 230000001687 destabilization Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 239000004088 foaming agent Substances 0.000 claims 2
- 239000002518 antifoaming agent Substances 0.000 abstract description 10
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 44
- PVXVWWANJIWJOO-UHFFFAOYSA-N 1-(1,3-benzodioxol-5-yl)-N-ethylpropan-2-amine Chemical compound CCNC(C)CC1=CC=C2OCOC2=C1 PVXVWWANJIWJOO-UHFFFAOYSA-N 0.000 description 13
- QMMZSJPSPRTHGB-UHFFFAOYSA-N MDEA Natural products CC(C)CCCCC=CCC=CC(O)=O QMMZSJPSPRTHGB-UHFFFAOYSA-N 0.000 description 13
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 11
- 230000008859 change Effects 0.000 description 8
- 238000005187 foaming Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- 208000005156 Dehydration Diseases 0.000 description 6
- 230000018044 dehydration Effects 0.000 description 6
- 238000006297 dehydration reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009298 carbon filtering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0431—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance containing aromatic rings
- B01D19/0436—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance containing aromatic rings with substituted groups
- B01D19/0454—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance containing aromatic rings with substituted groups which contain S-atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the field of natural gas desulfurization, in particular to an automatic natural gas desulfurization system, which comprises: a desulfurization unit; a data acquisition unit; the data analysis unit is used for determining whether to perform instability analysis according to the pressure stability coefficient, and in a first instability analysis mode, the data analysis unit adjusts the primary adding amount of the foam remover according to the carbon dioxide content and/or determines whether to adjust the secondary adding amount of the foam remover or the solution circulation duration according to the turning reference state; the compensation adjusting unit is used for determining an adjusting mode of the interval throwing duration according to the desulfurization degree parameter; the release amount of the defoaming agent is regulated according to the actual working scene, so that the release amount meets the working requirement, and the desulfurization efficiency of the invention is further improved.
Description
Technical Field
The invention relates to the field of natural gas desulfurization, in particular to an automatic natural gas desulfurization system.
Background
Natural gas is taken as a clean energy source, is an important development object of the energy industry in China in recent ten years, natural gas resources in China are rich, but most of the natural gas resources have the characteristic of high sulfur content, sulfur elements mainly exist in the form of hydrogen sulfide, a large amount of sulfide pollutants are generated by direct combustion, the environment is seriously polluted, an MDEA aqueous solution desulfurization method is a common desulfurization method at present, but the problems of unstable pressure and poor desulfurization effect of a desulfurization tank due to easy foaming of the solution in the MDEA aqueous solution desulfurization at present are urgent problems to be solved at present, and therefore, how to improve the desulfurization stability of the desulfurization tank in the MDEA aqueous solution desulfurization is a urgent problem to be solved at present.
Chinese patent publication No. CN115925182a discloses an MDEA solution on-line deep purification system comprising: flash tank, mechanical filtration unit, active carbon filtration unit, post-positioned precision filtration unit, electrodialysis desalination system and resin system, its characterized in that: the said; when the MDEA solution is purified, the MDEA solution sequentially passes through a flash tank, a mechanical filtering unit, an active carbon filtering unit, a rear precise filtering unit, an electrodialysis desalination system and a resin system, and the beneficial effects of the invention are that: the problems of low efficiency and frequent back flushing of the traditional filter cloth are overcome; the bag filter has small dirt holding capacity, the filter bag is frequently replaced, and the waste filter bag cannot be treated; hierarchical filtration and combined installation; by adopting the high-efficiency combined online amine liquid filtering device, the purification of amine can be basically realized; in addition, chinese patent publication No. CN108759919a discloses a method and system for diagnosing and eliminating the liquid blocking phenomenon of a regeneration tower system, the method comprising: the regeneration tower in the regeneration tower system is provided with a remote thermometer, a remote pressure difference meter and a remote liquid level meter, and the monitoring values of the temperature, the pressure difference and the liquid level at different times are displayed by DCS pictures, and a change curve taking time as a horizontal axis is formed: when the monitored temperature difference is not less than DeltaT 1 and the temperature difference change frequency is not less than f; or when the monitored liquid level difference is more than or equal to Deltax and the liquid level difference change frequency is more than or equal to f; or when the monitored pressure level difference is more than or equal to P1, adding the defoaming agent at the latest within t1 hours. When the monitored temperature difference is less than or equal to delta T2 and the temperature difference change frequency is less than or equal to f; or when the monitored liquid level difference is < [ delta ] x and the liquid level difference change frequency is less than or equal to f; or when the monitored pressure level difference is less than or equal to P2; and stopping adding the defoaming agent within t2 hours at the latest. Although the technical scheme discloses a treatment method for MDEA solution foaming, the MDEA solution online deep purification system aims at purifying impurities in the MDEA solution to reduce the foaming degree of the MDEA, and the regeneration tower system liquid blocking phenomenon diagnosis and elimination method and system can pre-judge the foaming degree in advance and make adjustment in advance by judging a change curve which is displayed by DCS pictures of different time temperatures, pressure level differences and liquid level monitoring values and takes time as a horizontal axis, but the technical scheme does not consider the fact that the actual treatment effect of the foam remover is adaptively adjusted, so that the adding amount of the foam remover and the interval duration between two adjacent adding steps cannot meet the actual working scene, and the foaming slowing degree of the MDEA is easy to be poor or the adding amount of the foam remover is too large, so that the desulfurization efficiency of a desulfurizing tower is poor.
Disclosure of Invention
Therefore, the invention provides an automatic natural gas desulfurization system which is used for solving the problems that in the prior art, the adding amount of a foam remover and the interval time between two adjacent adding steps cannot meet the actual working scene, so that the foaming slowing degree of MDEA is poor or the desulfurizing efficiency of a desulfurizing tower is poor due to the excessive adding amount of the foam remover.
To achieve the above object, the present invention provides an automated natural gas desulfurization system comprising:
the desulfurization unit comprises a desulfurization tower for desulfurizing the natural gas, and the desulfurization tower is connected with a circulation module;
the data acquisition unit is connected with the desulfurization unit and is used for acquiring the demand information;
a data analysis unit respectively connected with the desulfurization unit and the data acquisition unit for determining whether to perform instability analysis according to the pressure stability coefficient,
the data analysis unit adjusts the primary adding amount of the foam remover according to the carbon dioxide content in a first instability analysis mode and/or determines whether to adjust the secondary adding amount of the foam remover or the solution circulation duration according to a turning reference state;
in a second instability analysis mode, the data analysis unit detects the lean-rich temperature difference to determine whether to adjust the power of the heat tracing device of the circulating pipeline;
the compensation adjusting unit is connected with the desulfurization unit, the data acquisition unit and the data analysis unit and is used for determining an adjusting mode of the interval throwing duration according to the desulfurization degree parameter;
the demand information comprises pressure in a desulfurizing tank, carbon dioxide content in product gas, operation time of the desulfurizing tank, sulfur content in the product gas, lean solution temperature and rich solution temperature; the circulating module is used for recovering rich liquid in the desulfurizing tower into lean liquid through regeneration treatment and conveying the lean liquid to the desulfurizing tower again.
Further, the data analysis unit periodically calculates a pressure stability coefficient, determines whether to perform instability analysis according to the pressure stability coefficient, presets an instability analysis mode including a first instability analysis mode for analyzing the carbon dioxide content of the product gas,
and a second destabilization analysis mode of analyzing the lean-rich temperature difference at the pressure stability factor;
the instability analysis mode is selected according to a preset pressure stability coefficient range where the pressure stability coefficient is located.
Further, the data analysis unit detects the carbon dioxide content, and increases and adjusts the one-time adding amount of the defoaming agent when the carbon dioxide content is in a preset reference value range;
the increasing amount of the primary foam removing agent adding amount of the foam removing agent and the carbon dioxide content are in negative correlation.
Further, the data analysis unit detects a turning reference state and determines a secondary adjustment target according to the turning reference state, wherein the secondary adjustment target comprises the secondary dosing amount of the defoaming agent and the solution circulation duration;
wherein, when the turning reference state is in the first preset turning reference state, the secondary regulation target is the secondary throwing amount of the foam remover, and when the turning reference state is in the second preset turning reference state, the secondary regulation target is the solution circulation time length; the first preset turning reference state is that the carbon dioxide content corresponding to the secondary peak point is smaller than the preset secondary peak point content and the duration corresponding to the turning section is smaller than the preset turning duration, and the second preset turning reference state is that the carbon dioxide content corresponding to the secondary peak point is larger than or equal to the preset secondary peak point content and the duration corresponding to the turning section is larger than or equal to the preset turning duration.
Further, the data analysis unit increases and adjusts the secondary adding amount of the defoaming agent according to the carbon dioxide content corresponding to the secondary peak point;
and the increasing amount of the secondary throwing amount and the carbon dioxide content corresponding to the secondary peak point are in a negative correlation.
Further, the data analysis unit reduces and adjusts the circulation time length of the solution according to the time length corresponding to the turning section;
the reduction of the solution circulation time length is in negative correlation with the time length corresponding to the turning section.
Further, the compensation adjustment unit detects the desulfurization degree parameter under the compensation adjustment condition and determines an adjustment mode of the interval throwing duration according to the desulfurization degree parameter, wherein the adjustment mode comprises: a first adjustment mode for reducing and adjusting the interval throwing duration according to the peak reference distance when the desulfurization degree parameter is larger than the preset desulfurization degree parameter,
and a second adjustment mode for increasing and adjusting the interval throwing duration according to the difference value of the desulfurization degree parameters when the desulfurization degree parameters are smaller than the preset desulfurization degree parameters;
the reduction of the interval throwing duration and the peak reference distance are in positive correlation;
extracting a primary wave crest adjacent to the secondary wave crest and having the farthest distance, calculating the distance between the secondary wave crest and the wave crest of the primary wave crest, and recording the distance as a wave crest reference distance; the compensation adjustment condition is that the secondary adjustment target is determined to be completed and the two monitoring periods are ended.
Further, when the desulfurization degree parameter is smaller than the preset desulfurization degree parameter, the compensation adjustment unit increases and adjusts the interval throwing duration according to the desulfurization degree parameter difference value;
the difference value between the increment of the interval throwing duration and the desulfurization degree parameter is a positive correlation;
the desulfurization degree parameter difference value is the absolute value of the difference value between the desulfurization degree parameter and the preset desulfurization degree parameter.
Further, the data analysis unit detects a lean-rich temperature difference and increases and adjusts the power of the heat tracing device of the circulating pipeline when the lean-rich temperature difference is in a first preset lean-rich temperature difference range;
the increase of the power of the heat tracing device is in positive correlation with the lean-rich temperature difference.
Further, when the lean-rich temperature difference is in a second preset lean-rich temperature difference range, the data analysis unit judges that fault detection reminding information is sent to a user through the display unit.
Compared with the prior art, the method has the beneficial effects that the release mode of the foam removing agent is interval release, batch release is carried out during each release, when the release of the foam removing agent is completed in a single release mode in the prior art, lean solution without the foam removing agent is easy to foam again on a tray when being circularly transmitted to the desulfurizing tank, so that the content of carbon dioxide in product gas is reduced, and then the content of carbon dioxide in the product gas is increased when the lean solution with the foam removing agent is circularly transmitted to the desulfurizing tank, therefore, the method ensures that the content of carbon dioxide in the product gas is more stable and the pressure stability degree in the desulfurizing tank is improved through batch release in the single release, wherein the release amount is adjusted according to actual working scenes, so that the release amount meets the working requirements, and the desulfurizing efficiency is further improved.
Further, when the carbon dioxide content is in the preset reference value range, the data analysis unit increases and adjusts the one-time adding amount of the foam removing agent, so that the problem of foaming of the desulfurizing agent caused by too small adding amount of the foam removing agent is avoided.
Further, when the carbon dioxide content corresponding to the secondary peak point is smaller than the preset secondary peak point content and the time length corresponding to the turning section is smaller than the preset turning time length, the secondary regulation target is the secondary addition amount of the foam remover, so that the problem that when the foam remover is added in a single addition mode, lean liquid without the foam remover is easily foamed again on a tray when being circularly conveyed to a desulfurization tank, and the content of carbon dioxide in product gas is reduced is avoided.
Further, when the carbon dioxide content corresponding to the secondary peak point is greater than or equal to the preset secondary peak point content and the time length corresponding to the turning section is greater than or equal to the preset turning time length, the secondary adjustment target is the solution circulation time length, the time length that the lean solution dissolved with the foam removing agent is circulated and conveyed to the desulfurization tank is reduced by adjusting the solution circulation time length, the dissolution effect of the foam removing agent is further improved, the content change of carbon dioxide in the product gas is further stable, and the desulfurization effect of the invention is further improved.
Further, when the desulfurization degree parameter is larger than the preset desulfurization degree parameter, the compensation adjustment unit performs reduction adjustment on the interval throwing duration according to the peak reference distance, so that the interval throwing duration is reduced while the desulfurization effect is ensured, the carbon dioxide content in the product gas and the variation stability degree of the carbon dioxide content are further improved, and the desulfurization effect of the invention is further improved.
Drawings
FIG. 1 is a block diagram of an automated natural gas desulfurization system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a desulfurization unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a monitoring image according to an embodiment of the present invention;
FIG. 4 is a flowchart of the data analysis unit determining a secondary adjustment target according to a turning reference state according to an embodiment of the present invention;
in the figure: a two-dimensional coordinate system 1, a primary peak point 2, a secondary peak point 3, a turning section 4 and a turning point 5.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, which is a unit connection diagram of an automated natural gas desulfurization system according to an embodiment of the present invention, the present invention provides an automated natural gas desulfurization system, including:
the desulfurization unit comprises a desulfurization tower for desulfurizing the natural gas, and the desulfurization tower is connected with a circulation module;
the data acquisition unit is connected with the desulfurization unit and is used for acquiring the demand information;
a data analysis unit respectively connected with the desulfurization unit and the data acquisition unit for determining whether to perform instability analysis according to the pressure stability coefficient,
the data analysis unit adjusts the primary adding amount of the foam remover according to the carbon dioxide content in a first instability analysis mode and/or determines whether to adjust the secondary adding amount of the foam remover or the solution circulation duration according to a turning reference state;
in a second instability analysis mode, the data analysis unit detects the lean-rich temperature difference to determine whether to adjust the power of the heat tracing device of the circulating pipeline;
the compensation adjusting unit is connected with the desulfurization unit, the data acquisition unit and the data analysis unit and is used for determining an adjusting mode of the interval throwing duration according to the desulfurization degree parameter;
the demand information comprises pressure in a desulfurizing tank, carbon dioxide content in product gas, operation time of the desulfurizing tank, sulfur content in the product gas, lean solution temperature and rich solution temperature; the circulating module is used for recovering rich liquid in the desulfurizing tower into lean liquid through regeneration treatment and conveying the lean liquid to the desulfurizing tower again.
The automatic spraying device is externally connected with a foam removing agent storage device, each monitoring period of the automatic spraying device carries out the release of the foam removing agent, the release of the foam removing agent in a single monitoring period comprises primary release and secondary release, the release of the foam removing agent in the primary release is larger than that of the foam removing agent in the secondary release, the release of the foam removing agent in the primary release is recorded as the release of the foam removing agent in the primary release, the release of the foam removing agent in the secondary release is recorded as the release of the foam removing agent in the secondary release, the duration of the single monitoring period is set by a user according to an actual application scene, the duration of the monitoring period is 1h, the duration setting of the monitoring period is ensured, and the times of the primary release and the secondary release in the single monitoring period are all 1.
Referring to fig. 2, a schematic diagram of a desulfurization unit according to an embodiment of the present invention is shown, where the desulfurization unit further includes a circulation module, and the circulation module includes:
an air inlet end for conveying the natural gas with the separated solid impurities to the desulfurizing tower;
the dehydration end is connected with the desulfurization tower and is used for carrying out dehydration treatment on the natural gas subjected to desulfurization by the desulfurization tower;
a flash tank connected to the desulfurizing tower for flash evaporating the rich liquid having absorbed the hydrogen sulfide gas in the desulfurizing tower to separate out hydrocarbon;
a heat exchanger connected to the flash tank for exchanging heat between the rich liquid from which hydrocarbon separation is completed and the lean liquid discharged from the bottom of the regeneration column;
the rich liquid separated by the flash tank enters the upper layer of the regeneration tower after heat exchange of the heat exchanger is completed, the regeneration tower heats and decompresses the rich liquid, so that the rich liquid is separated out of carbon dioxide and hydrogen sulfide, the carbon dioxide and the hydrogen sulfide are discharged from the tower top, the rich liquid is recovered to be lean liquid after the heating and decompression of the rich liquid are completed, the lean liquid is conveyed to the heat exchanger by the regeneration tower to exchange heat, the lean liquid after the heat exchange is conveyed to the circulating pump to be conveyed into the desulfurizing tower, the air inlet end, the dehydration end, the flash tank, the heat exchanger, the regeneration tower and the desulfurizing tower are all connected through a circulating pipeline, and the heat tracing device is uniformly arranged on the surface of the circulating pipeline and is a heat tracing line and is easy to understand by a person skilled in the art and is not repeated. The rich liquid is a desulfurizing agent absorbing hydrogen sulfide gas, and the lean liquid is a desulfurizing agent after the hydrogen sulfide gas is separated out or not absorbing the hydrogen sulfide gas.
Specifically, the pressure in the desulfurizing tank pipe can be detected by a pressure detector, the product gas is natural gas after desulfurization, the carbon dioxide content of the product gas can be detected by a carbon dioxide sensor, the sulfur content in the product gas can be detected by a hydrogen sulfide sensor, the lean solution temperature and the rich solution temperature can be detected by a temperature sensor, the temperature of the lean solution at the bottom in the desulfurizing tank is recorded as the lean solution temperature, the temperature of the rich solution in a circulating pipeline connected with the desulfurizing tank is recorded as the rich solution temperature, the carbon dioxide content of the product gas is the concentration ratio of carbon dioxide in the natural gas received in unit time at a dehydration end, and the sulfur content in the product gas is the concentration ratio of hydrogen sulfide in the natural gas received in unit time at the dehydration end.
Specifically, the data analysis unit periodically calculates a pressure stability coefficient, determines whether to perform instability analysis according to the pressure stability coefficient, presets an instability analysis mode including a first instability analysis mode for analyzing the carbon dioxide content of the product gas,
and a second destabilization analysis mode of analyzing the lean-rich temperature difference at the pressure stability factor;
the instability analysis mode is selected according to a preset pressure stability coefficient range where the pressure stability coefficient is located.
Specifically, the calculation formula of the pressure stability coefficient S is:
。
wherein, the pressure in the desulfurization tank is detected every 10s in a single monitoring period of the data acquisition unit, pi is the pressure in the desulfurization tank detected at the ith time in the single monitoring period, P0 is the pressure average value,i=1, 2,3, … …, n, n is the total detection number of the internal pressure of the desulfurization tank in a single monitoring period, and is used for reflecting whether the internal pressure of the desulfurization tank is stable or not according to a pressure stability coefficient, when the pressure stability coefficient is in a first preset pressure stability coefficient range, the data analysis unit judges that a first instability analysis mode is adopted, when the pressure stability coefficient is in a second preset pressure stability coefficient range, the data analysis unit judges that a second instability analysis mode is adopted, when the pressure stability coefficient is in a third preset pressure stability coefficient range, the data analysis unit judges that the internal pressure of the desulfurization tank is stable, the values in the first preset pressure stability coefficient range are all greater than 20% of P0, the values in the second preset pressure stability coefficient range are all less than or equal to 20% of P0 and are greater than 10% of P0, and the values in the third preset pressure stability coefficient range are all less than or equal to 10% of P0.
Specifically, the data analysis unit detects the carbon dioxide content of the product gas, and increases and adjusts the one-time adding amount of the defoaming agent when the carbon dioxide content is in a preset reference value range;
the increasing amount of the primary foam removing agent adding amount of the foam removing agent and the carbon dioxide content are in a negative correlation; the foam remover may use, but is not limited to, a sodium dodecyl benzene sulfonate solution; the desulfurizing agent in the desulfurizing tower is MDEA solution.
Specifically, the carbon dioxide content is the carbon dioxide content of the current product gas, the values in the preset reference value range are all smaller than 2%, and if the carbon dioxide content is larger than or equal to any value in the preset reference value range, the one-time adding amount does not need to be adjusted.
Specifically, the data analysis unit detects a turning reference state and determines a secondary adjustment target according to the turning reference state, wherein the secondary adjustment target comprises the secondary dosing amount of the defoaming agent and the solution circulation duration;
wherein, when the turning reference state is in the first preset turning reference state, the secondary regulation target is the secondary throwing amount of the foam remover, and when the turning reference state is in the second preset turning reference state, the secondary regulation target is the solution circulation time length; the first preset turning reference state is that the carbon dioxide content corresponding to the secondary peak point is smaller than the preset secondary peak point content and the duration corresponding to the turning section is smaller than the preset turning duration, the second preset turning reference state is that the carbon dioxide content corresponding to the secondary peak point is larger than or equal to the preset secondary peak point content and the duration corresponding to the turning section is larger than or equal to the preset turning duration, and if the carbon dioxide content corresponding to the secondary peak point is larger than or equal to the preset secondary peak point content and the duration corresponding to the turning section is smaller than the preset turning duration, the secondary adjustment target is required to be adjusted, and fault detection reminding information is sent to a user.
Referring to fig. 3, which is a schematic diagram of a carbon dioxide content monitoring image according to the embodiment of the present invention, a data acquisition unit generates a carbon dioxide content monitoring image according to a relationship between a detected product gas carbon dioxide content and a corresponding time in a single monitoring period at the end of the single monitoring period, the carbon dioxide content monitoring image is projected on a two-dimensional coordinate system 1, a horizontal axis of the two-dimensional coordinate system 1 is time, a vertical axis of the two-dimensional coordinate system 1 is the product gas carbon dioxide content, a corresponding point in which the carbon dioxide content in the single monitoring period rises to more than 130% of the initial carbon dioxide content in time sequence is recorded as a first-time peak point 2, a point in which the right side of the first-time peak point 2 is closest to the first-time peak point 2 and the corresponding carbon dioxide content is less than 115% of the initial carbon dioxide content is recorded as a second-time peak point 5, a point in which the right side of the turning point 5 is closest to the turning point and the corresponding carbon dioxide content is greater than the initial carbon dioxide content is recorded as a second-time peak point 3, an image line segment between the first-time peak point 2 and the second-time peak 3 is recorded as a second-time peak point 4, a preset-point 3 is a time point corresponding to the second-peak value, and a time length of the first-time peak 2 is set for the single-time value is set for the carbon dioxide content to be stable, and a user demand time is set for a high-time period is set for a user to the single-tank is set to be a high-required time.
With continued reference to fig. 1 to fig. 4, the data analysis unit increases and adjusts the secondary dosage of the defoaming agent according to the carbon dioxide content corresponding to the secondary peak point;
and the increasing amount of the secondary throwing amount and the carbon dioxide content corresponding to the secondary peak point are in a negative correlation.
Specifically, the data analysis unit reduces and adjusts the circulation time length of the solution according to the time length corresponding to the turning section;
the reduction of the solution circulation time length is in negative correlation with the time length corresponding to the turning section.
Specifically, the carbon dioxide content corresponding to the secondary peak point reflects the bubble removal effect of the bubble removal agent, and when the carbon dioxide content corresponding to the secondary peak point is smaller than the preset secondary peak point content, the bubble removal effect reflected as the bubble removal agent does not meet the user requirement, so that the secondary addition amount is increased; the time length corresponding to the turning section reflects the solution rate of the foam removing agent, and when the time length corresponding to the turning section is greater than or equal to the preset turning time length, the foam removing agent is reflected to be not fully dissolved in the desulfurizing agent in the circulating module, so that the foam removing agent can be fully dissolved in the desulfurizing agent in the circulating module and the desulfurizing tower through reducing and adjusting the solution circulating time length, further the desulfurizing effect of the desulfurizing agent and the change of the concentration of carbon dioxide in the product gas are more stable, and the desulfurizing efficiency of the invention is further improved.
Specifically, the compensation adjustment unit detects the desulfurization degree parameter under the compensation adjustment condition and determines an adjustment mode of the interval throwing duration according to the desulfurization degree parameter, wherein the adjustment mode comprises: a first adjustment mode for reducing and adjusting the interval throwing duration according to the peak reference distance when the desulfurization degree parameter is larger than the preset desulfurization degree parameter,
and a second adjustment mode for increasing and adjusting the interval throwing duration according to the difference value of the desulfurization degree parameters when the desulfurization degree parameters are smaller than the preset desulfurization degree parameters;
the reduction of the interval throwing duration and the peak reference distance are in positive correlation;
extracting a primary wave crest adjacent to the secondary wave crest and having the farthest distance, calculating the distance between the secondary wave crest and the wave crest of the primary wave crest, and recording the distance as a wave crest reference distance; the compensation adjustment condition is that the secondary adjustment target is determined to be completed and the two monitoring periods are ended.
Specifically, the concentration ratio P of hydrogen sulfide in product gas transmitted to a dehydration end by a desulfurization tower in the current monitoring period is monitored, the desulfurization degree parameter is 1/P, the preset desulfurization degree parameter is 1/10ppm, when the desulfurization degree parameter is larger than the preset desulfurization degree parameter, the desulfurization effect accords with the standard, the interval throwing duration is reduced and adjusted, the foaming degree of the desulfurizing agent is further increased, if the desulfurization degree parameter is smaller than the preset desulfurization degree parameter, the condition that the ratio of the defoaming agent in the desulfurizing agent is excessively large is reflected, the desulfurization effect is poor, the interval throwing duration is further increased and adjusted, and the practicability of the invention is further improved, wherein the interval throwing duration is the duration between one throwing corresponding to two adjacent monitoring periods.
Specifically, when the desulfurization degree parameter is smaller than the preset desulfurization degree parameter, the compensation adjustment unit increases and adjusts the interval throwing duration according to the desulfurization degree parameter difference value;
the difference value between the increment of the interval throwing duration and the desulfurization degree parameter is a positive correlation;
the desulfurization degree parameter difference value is the absolute value of the difference value between the desulfurization degree parameter and the preset desulfurization degree parameter.
Specifically, the data analysis unit detects a lean-rich temperature difference and performs increase adjustment on power of the heat tracing device of the circulating pipeline when the lean-rich temperature difference is in a first preset lean-rich temperature difference range;
the increase of the power of the heat tracing device is in positive correlation with the lean-rich temperature difference.
Specifically, when the lean-rich temperature difference is in the second preset lean-rich temperature difference range, the data analysis unit judges that fault detection reminding information is sent to a user through the display unit, and the system further comprises a display unit, wherein the display unit is connected with the data analysis unit and the compensation adjustment unit and used for displaying judging information.
Specifically, when the ambient temperature is lower, the heat dissipation of the lean solution temperature in the circulating pipeline arranged in the outdoor environment is faster, the lean solution temperature is easily caused to be lower than the temperature of the rich solution in the desulfurization tank, the too low lean solution temperature can cause the speed of the desulfurization reaction to be reduced, the removal efficiency of hydrogen sulfide is reduced, the desulfurization effect is affected, moreover, the temperature distribution in the desulfurization tower is possibly uneven due to the difference between the lean solution temperature and the rich solution temperature, and equipment corrosion, blockage and damage are possibly caused, so that when the lean-rich temperature difference is in a first preset lean-rich temperature difference range, the power of the heat tracing device of the circulating pipeline is increased and adjusted, and the lean solution temperature meets the actual working requirement.
The lean-rich temperature difference is a value obtained by subtracting the lean-rich temperature from the rich-liquid temperature, the values in the first preset lean-rich temperature difference range are all larger than 25 ℃ and smaller than or equal to 35 ℃, the values in the second preset lean-rich temperature difference range are all larger than 35 ℃, if the lean-rich temperature difference is smaller than or equal to 25 ℃ or the rich-liquid temperature is smaller than or equal to the lean-liquid temperature, the lean-rich temperature difference is qualified, and the data analysis unit judges that fault detection reminding information is sent to a user through the display unit if the difference obtained by subtracting the lean-liquid temperature from the rich-liquid temperature is larger than 25 ℃, and the circulating pipeline is a pipeline with a heat preservation function.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An automated natural gas desulfurization system, comprising:
the desulfurization unit comprises a desulfurization tower for desulfurizing the natural gas, and the desulfurization tower is connected with a circulation module;
the data acquisition unit is connected with the desulfurization unit and is used for acquiring the demand information;
a data analysis unit respectively connected with the desulfurization unit and the data acquisition unit for determining whether to perform instability analysis according to the pressure stability coefficient,
the data analysis unit adjusts the primary adding amount of the foam remover according to the carbon dioxide content in a first instability analysis mode and/or determines whether to adjust the secondary adding amount of the foam remover or the solution circulation duration according to a turning reference state;
in a second instability analysis mode, the data analysis unit detects the lean-rich temperature difference to determine whether to adjust the power of the heat tracing device of the circulating pipeline;
the compensation adjusting unit is connected with the desulfurization unit, the data acquisition unit and the data analysis unit and is used for determining an adjusting mode of the interval throwing duration according to the desulfurization degree parameter;
the demand information comprises pressure in a desulfurizing tank, carbon dioxide content in product gas, operation time of the desulfurizing tank, sulfur content in the product gas, lean solution temperature and rich solution temperature; the circulating module is used for recovering rich liquid in the desulfurizing tower into lean liquid through regeneration treatment and conveying the lean liquid to the desulfurizing tower again.
2. The automated natural gas desulfurization system of claim 1, wherein the data analysis unit periodically calculates a pressure stability factor and determines whether to perform a destabilization analysis according to the pressure stability factor, the data analysis unit is pre-provided with a destabilization analysis mode including a first destabilization analysis mode for analyzing a carbon dioxide content of the product gas,
and a second destabilization analysis mode of analyzing the lean-rich temperature difference at the pressure stability factor;
the instability analysis mode is selected according to a preset pressure stability coefficient range where the pressure stability coefficient is located.
3. The automated natural gas desulfurization system of claim 2, wherein the data analysis unit detects carbon dioxide content and performs an increase adjustment for a single shot of the de-bubbling agent when the carbon dioxide content is within a pre-adjustment reference value range;
the increasing amount of the primary foam removing agent adding amount of the foam removing agent and the carbon dioxide content are in negative correlation.
4. The automated natural gas desulfurization system of claim 3, wherein the data analysis unit detects a turning reference state and determines a secondary adjustment target based on the turning reference state, the secondary adjustment target comprising a secondary dosing amount of the de-foaming agent and a solution cycle duration;
wherein, when the turning reference state is in the first preset turning reference state, the secondary regulation target is the secondary throwing amount of the foam remover, and when the turning reference state is in the second preset turning reference state, the secondary regulation target is the solution circulation time length; the first preset turning reference state is that the carbon dioxide content corresponding to the secondary peak point is smaller than the preset secondary peak point content and the duration corresponding to the turning section is smaller than the preset turning duration, and the second preset turning reference state is that the carbon dioxide content corresponding to the secondary peak point is larger than or equal to the preset secondary peak point content and the duration corresponding to the turning section is larger than or equal to the preset turning duration.
5. The automated natural gas desulfurization system of claim 4, wherein the data analysis unit increases and adjusts a secondary dosing amount of the de-foaming agent according to a carbon dioxide content corresponding to a secondary peak point;
and the increasing amount of the secondary throwing amount and the carbon dioxide content corresponding to the secondary peak point are in a negative correlation.
6. The automated natural gas desulfurization system of claim 4, wherein the data analysis unit performs a reduction adjustment of the solution circulation duration according to the duration corresponding to the turn segment;
the reduction of the solution circulation time length is in negative correlation with the time length corresponding to the turning section.
7. The automated natural gas desulfurization system of claim 4, wherein the compensation adjustment unit detects desulfurization degree parameters under compensation adjustment conditions and determines an adjustment mode of the interval delivery duration based on the desulfurization degree parameters, the adjustment mode comprising: a first adjustment mode for reducing and adjusting the interval throwing duration according to the peak reference distance when the desulfurization degree parameter is larger than the preset desulfurization degree parameter,
and a second adjustment mode for increasing and adjusting the interval throwing duration according to the difference value of the desulfurization degree parameters when the desulfurization degree parameters are smaller than the preset desulfurization degree parameters;
the reduction of the interval throwing duration and the peak reference distance are in positive correlation;
extracting a primary wave crest adjacent to the secondary wave crest and having the farthest distance, calculating the distance between the secondary wave crest and the wave crest of the primary wave crest, and recording the distance as a wave crest reference distance; the compensation adjustment condition is that the secondary adjustment target is determined to be completed and the two monitoring periods are ended.
8. The automated natural gas desulfurization system of claim 7, wherein the compensation adjustment unit increases and adjusts the interval delivery duration according to a desulfurization degree parameter difference when the desulfurization degree parameter is less than a preset desulfurization degree parameter;
the difference value between the increment of the interval throwing duration and the desulfurization degree parameter is a positive correlation;
the desulfurization degree parameter difference value is the absolute value of the difference value between the desulfurization degree parameter and the preset desulfurization degree parameter.
9. The automated natural gas desulfurization system of claim 2, wherein the data analysis unit detects a lean-rich temperature difference and adjusts for an increase in power of the heat tracing device of the circulation conduit when the lean-rich temperature difference is within a first preset lean-rich temperature difference range;
the increase of the power of the heat tracing device is in positive correlation with the lean-rich temperature difference.
10. The automated natural gas desulfurization system of claim 9, wherein the data analysis unit determines to send a fault detection alert to the user via the display unit when the lean-rich temperature difference is within a second predetermined lean-rich temperature difference range.
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