CN111090294A - Cold box self-adaptive control device and control method - Google Patents
Cold box self-adaptive control device and control method Download PDFInfo
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- CN111090294A CN111090294A CN201911416431.5A CN201911416431A CN111090294A CN 111090294 A CN111090294 A CN 111090294A CN 201911416431 A CN201911416431 A CN 201911416431A CN 111090294 A CN111090294 A CN 111090294A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000012071 phase Substances 0.000 claims abstract description 92
- 239000003507 refrigerant Substances 0.000 claims abstract description 79
- 239000007791 liquid phase Substances 0.000 claims abstract description 73
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 35
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 116
- 239000003345 natural gas Substances 0.000 claims description 58
- 239000007789 gas Substances 0.000 claims description 44
- 239000002994 raw material Substances 0.000 claims description 16
- 230000004069 differentiation Effects 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005057 refrigeration Methods 0.000 abstract description 7
- 239000007792 gaseous phase Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- Automation & Control Theory (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a self-adaptive control device and a control method for a cold box, which comprise a cold box body, a compressor for compressing refrigerant and separating the refrigerant into liquid-phase refrigerant and gas-phase refrigerant, an output pipeline system, a gas-phase pipeline system, a liquid-phase pipeline system and a mixed pipeline system, wherein the control device automatically controls the refrigeration effect of the cold box and the output flow of liquefied natural gas, the output flow and the temperature of the liquefied natural gas are kept near set values, the labor cost is reduced, and the automation degree is improved.
Description
Technical Field
The invention relates to the technical field of liquefied natural gas, in particular to a self-adaptive control device and a control method for a cold box.
Background
In the prior art, the temperature and flow control of liquefied natural gas during liquefied natural gas production needs to observe the changes of the inlet flow of raw material gas in a cold box, the temperature of an LNG outlet, the temperature of the cold box and the front and back pressure of a J-T valve, the refrigerating capacity and yield matching are adjusted by adjusting the loading position of a compressor to change the flow of mixed refrigerant entering the cold box and the opening degree of the J-T valve, the LNG temperature at the outlet of the cold box is realized by manually controlling an LNG discharge valve, the adjustment automation degree is low in the mode, manpower is wasted, and production is influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a self-adaptive control device and a control method for a cold box, which automatically control the refrigeration effect of the cold box and the output flow of liquefied natural gas, so that the output flow and the temperature of the liquefied natural gas are kept near set values, the labor cost is reduced, and the automation degree is improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a cold box self-adaptation controlling means, includes cold box body and is used for compressing the cryogen and separates into the compressor of liquid phase cryogen and gaseous phase cryogen with it, controlling means still includes output pipe-line system, gaseous phase pipe-line system, liquid phase pipe-line system and mixed pipe-line system, output pipe-line system is including raw materials input pipeline, natural gas heat exchanger and the natural gas output pipeline that communicate in proper order, gaseous phase pipe-line system is including gaseous phase input pipeline, gaseous phase heat exchanger and the gaseous phase output pipeline that communicate in proper order, liquid phase pipe-line system is including liquid phase input pipeline, liquid phase heat exchanger and the liquid phase output pipeline that communicate in proper order, mixed pipe-line system is including mixed heat exchanger and mixed output pipeline, the export of gaseous phase output pipeline and the export of liquid phase output pipeline all communicate with mixed heat exchanger's import, The outlet of the mixing output pipeline is communicated with the refrigerant inlet, the liquid phase outlet is communicated with the liquid phase input pipeline, and the gas phase outlet is communicated with the gas phase input pipeline;
the natural gas output pipeline is provided with a natural gas output flowmeter for measuring flow, a natural gas output thermometer for measuring temperature and a natural gas output control valve for controlling flow;
a liquid phase control valve for controlling the flow of the liquid phase refrigerant is arranged on the liquid phase output pipeline;
a gas phase control valve for controlling the flow of the gas phase refrigerant is arranged on the gas phase output pipeline;
the natural gas raw material enters from a raw material input pipeline, obtains cold energy in a natural gas heat exchanger to become liquefied natural gas, and flows out from a natural gas output pipeline;
the cold box obtains the refrigerant from the refrigerant inlet, compresses the refrigerant into gas-phase refrigerant and liquid-phase refrigerant, sends the gas-phase refrigerant to the gas-phase outlet and flows into the gas-phase input pipeline, and sends the liquid-phase refrigerant to the liquid-phase refrigerant outlet and flows into the liquid-phase input pipeline;
the gas-phase refrigerant in the gas-phase input pipeline flows into the gas-phase heat exchanger and provides cold energy for the natural gas heat exchanger, and flows into the mixed heat exchanger through the gas-phase output pipeline; and the liquid-phase refrigerant and the gas-phase refrigerant are mixed in the mixed heat exchanger and provide cold energy for the natural gas heat exchanger.
Further, natural gas heat exchanger, gaseous phase heat exchanger, liquid phase heat exchanger and mixed heat exchanger set up at the cold box originally internally, the cold box still includes the first temperature measuring device who is used for measuring this internal intermediate temperature section temperature of cold box to and be used for measuring the second temperature measuring device of low temperature section temperature.
Further, a gas phase input flow meter for measuring the flow of the gas phase refrigerant, a gas phase input pressure gauge for measuring the pressure of the gas phase refrigerant and a gas phase input thermometer for measuring the temperature of the gas phase refrigerant are arranged on the gas phase input pipeline; and the gas phase output pipeline is provided with a gas phase control valve for controlling the flow of the gas phase refrigerant.
Furthermore, a mixed output flowmeter and a mixed output pressure gauge are arranged on the mixed output pipeline.
A control method of a cold box self-adaptive control device comprises the following steps:
the method comprises the following steps: starting a compressor to convey a refrigerant for a cold box body, and conveying a natural gas raw material into a natural gas pipeline;
step two: measuring the actual temperature of the liquefied natural gas through a natural gas output thermometer, obtaining a temperature difference value by making a difference with the preset temperature of the liquefied natural gas, and carrying out PID (proportion integration differentiation) adjustment on the opening of the liquid phase control valve according to the temperature difference value;
step three: the actual flow of the liquefied natural gas is measured through the natural gas output flow meter, the difference is made between the actual flow and the preset flow of the liquefied natural gas to obtain a flow difference value, and PID (proportion integration differentiation) adjustment is carried out on the opening of the natural gas output control valve according to the flow difference value.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the refrigeration effect of automatically controlling the refrigeration box and the output flow of the liquefied natural gas, the output flow and the temperature of the liquefied natural gas are kept near the set value, the labor cost is reduced, and the automation degree is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the control method of the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a self-adaptive control device for a cold box comprises a cold box body 10 and a compressor for compressing refrigerant and separating the refrigerant into liquid-phase refrigerant and gas-phase refrigerant, and is characterized in that the control device further comprises a production pipeline system 20, a gas-phase pipeline system 30, a liquid-phase pipeline system 50 and a mixing pipeline system 40, the production pipeline system 20 comprises a raw material input pipeline 21, a natural gas heat exchanger 22 and a natural gas output pipeline 23 which are sequentially communicated, the gas-phase pipeline system 30 comprises a gas-phase input pipeline 31, a gas-phase heat exchanger 32 and a gas-phase output pipeline 33 which are sequentially communicated, the liquid-phase pipeline system 50 comprises a liquid-phase input pipeline 51, a liquid-phase heat exchanger 52 and a liquid-phase output pipeline 53 which are sequentially communicated, the mixing pipeline system 40 comprises a mixing heat exchanger 41 and a mixing output pipeline 42, an outlet of the gas-phase output pipeline 33 and an outlet of the liquid-phase, the compressor comprises a refrigerant inlet, a liquid phase outlet and a gas phase outlet, the outlet of the mixing output pipeline 42 is communicated with the refrigerant inlet, the liquid phase outlet is communicated with the liquid phase input pipeline 51, and the gas phase outlet is communicated with the gas phase input pipeline 31;
the natural gas output pipeline 23 is provided with a natural gas output flowmeter 26 for measuring flow, a natural gas output thermometer 25 for measuring temperature and a natural gas output control valve 24 for controlling flow;
the liquid phase output pipeline 53 is provided with a liquid phase control valve 54 for controlling the flow rate of the liquid phase refrigerant;
the gas phase output pipeline 33 is provided with a gas phase control valve 37 for controlling the flow of the gas phase refrigerant;
the natural gas raw material enters from a raw material input pipeline 21, obtains cold energy in a natural gas heat exchanger 22 to become liquefied natural gas, and flows out from a natural gas output pipeline 23;
the cold box obtains the refrigerant from the refrigerant inlet, compresses the refrigerant into gas-phase refrigerant and liquid-phase refrigerant, sends the gas-phase refrigerant to the gas-phase outlet and flows into the gas-phase input pipeline 31, and sends the liquid-phase refrigerant to the liquid-phase refrigerant outlet and flows into the liquid-phase input pipeline 51;
the gas-phase refrigerant in the gas-phase input pipeline 31 flows into the gas-phase heat exchanger 32 and provides cold energy for the natural gas heat exchanger, and flows into the mixing heat exchanger 41 through the gas-phase output pipeline 33; the liquid-phase refrigerant in the liquid-phase input pipeline 51 flows into the liquid-phase heat exchanger 52 and provides cooling energy for the natural gas heat exchanger, and flows into the mixed heat exchanger 41 through the liquid-phase output pipeline 53, and the liquid-phase refrigerant and the gas-phase refrigerant are mixed in the mixed heat exchanger and provide cooling energy for the natural gas heat exchanger 22.
After production begins, a compressor is started to convey a refrigerant for a cold box body, and natural gas raw materials are conveyed into a natural gas pipeline; the actual temperature of the liquefied natural gas is measured through the natural gas output thermometer, the actual temperature of the liquefied natural gas is differed with the preset temperature of the liquefied natural gas to obtain a temperature difference value, PID adjustment is carried out on the opening degree of the liquid phase control valve 54 according to the temperature difference value, the mixing proportion of the liquid phase refrigerant and the gas phase refrigerant can be changed by changing the opening degree of the liquid phase control valve, the freezing effect of the cold box on the natural gas raw material is changed, and then the final temperature of the liquefied natural gas is changed.
The actual flow of the liquefied natural gas is measured through the natural gas production flow meter, the difference is made between the actual flow and the preset flow of the liquefied natural gas to obtain a flow difference value, and PID adjustment is carried out on the opening degree of the natural gas production control valve 24 according to the flow difference value.
The PID regulation is the conventional technology in the prior art, the difference value of the actual value and the measured value is used as the regulation basis, the control effect is good, the refrigeration effect of the refrigeration box and the output flow of the liquefied natural gas can be automatically controlled, the output flow and the temperature of the liquefied natural gas are kept near the set values, the labor cost is reduced, and the automation degree is improved.
As shown in fig. 1, the natural gas heat exchanger 22, the gas phase heat exchanger 32, the liquid phase heat exchanger 52 and the hybrid heat exchanger 41 are arranged in the cold box body, the cold box further comprises a first temperature measuring device 11 for measuring the temperature of the medium temperature section in the cold box body and a second temperature measuring device 12 for measuring the temperature of the low temperature section, the temperature distribution and the variation trend in the cold box can be monitored through the first temperature measuring device and the second temperature measuring device, and the heat exchange condition of the cold inside can be known in time.
As shown in fig. 1, a gas phase input flow meter 34 for measuring the flow rate of the gas phase refrigerant, a gas phase input pressure gauge 35 for measuring the pressure of the gas phase refrigerant, and a gas phase input thermometer 36 for measuring the temperature of the gas phase refrigerant are arranged on the gas phase input pipeline; the gas phase output pipeline 33 is provided with a gas phase control valve 37 for controlling the flow of the gas phase refrigerant, the mixing ratio of the gas phase refrigerant and the liquid phase refrigerant is changed by controlling the opening degree of the gas phase control valve, and then the compression ratio of the compressor is changed, the compression ratio of the compressor is kept in a required operation range, the compressor is prevented from being damaged when the compression ratio is too large or too small, and meanwhile, the reduction of the refrigeration effect can be avoided, so that the efficient operation of the compressor is kept.
As shown in fig. 1, a mixed output flow meter 44 and a mixed output pressure meter 44 are arranged on the mixed output pipeline; the mixed output flowmeter and the mixed output pressure gauge can monitor the state of the refrigerant entering the inlet of the compressor, reduce the number of operators and improve the production efficiency.
As shown in fig. 2, a control method of a cold box adaptive control device includes the following steps:
s1: starting a compressor to convey a refrigerant for a cold box body, and conveying a natural gas raw material into a natural gas pipeline;
s2: measuring the actual temperature of the liquefied natural gas through a natural gas output thermometer, obtaining a temperature difference value by making a difference with the preset temperature of the liquefied natural gas, and carrying out PID (proportion integration differentiation) adjustment on the opening of the liquid phase control valve according to the temperature difference value;
s3: the actual flow of the liquefied natural gas is measured through the natural gas output flow meter, the difference is made between the actual flow and the preset flow of the liquefied natural gas to obtain a flow difference value, and PID (proportion integration differentiation) adjustment is carried out on the opening of the natural gas output control valve according to the flow difference value.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A self-adaptive control device of a cold box comprises a cold box body (10) and a compressor used for compressing refrigerant and separating the refrigerant into liquid-phase refrigerant and gas-phase refrigerant, and is characterized in that the control device further comprises an output pipeline system (20), a gas-phase pipeline system (30), a liquid-phase pipeline system (50) and a mixed pipeline system (40), the output pipeline system (20) comprises a raw material input pipeline (21), a natural gas heat exchanger (22) and a natural gas output pipeline (23) which are sequentially communicated, the gas-phase pipeline system (30) comprises a gas-phase input pipeline (31), a gas-phase heat exchanger (32) and a gas-phase output pipeline (33) which are sequentially communicated, the liquid-phase pipeline system (50) comprises a liquid-phase input pipeline (51), a liquid-phase heat exchanger (52) and a liquid-phase output pipeline (53) which are sequentially communicated, the mixed pipeline system (40) comprises a mixed heat exchanger (41) and, the outlet of the gas-phase output pipeline (33) and the outlet of the liquid-phase output pipeline (53) are both communicated with the inlet of the mixing heat exchanger (41), the compressor comprises a refrigerant inlet, a liquid-phase outlet and a gas-phase outlet, the outlet of the mixing output pipeline (42) is communicated with the refrigerant inlet, the liquid-phase outlet is communicated with the liquid-phase input pipeline (51), and the gas-phase outlet is communicated with the gas-phase input pipeline (31);
the natural gas output pipeline (23) is provided with a natural gas output flowmeter (26) for measuring flow, a natural gas output thermometer (25) for measuring temperature and a natural gas output control valve (24) for controlling flow;
a liquid phase control valve (54) for controlling the flow rate of liquid phase refrigerant is arranged on the liquid phase output pipeline (53);
the natural gas raw material enters from a raw material input pipeline (21), obtains cold energy in a natural gas heat exchanger (22) to become liquefied natural gas, and flows out from a natural gas output pipeline (23);
the cold box obtains refrigerant from a refrigerant inlet, compresses the refrigerant into gas-phase refrigerant and liquid-phase refrigerant, sends the gas-phase refrigerant to a gas-phase outlet and flows into a gas-phase input pipeline (31), and sends the liquid-phase refrigerant to a liquid-phase refrigerant outlet and flows into a liquid-phase input pipeline (51);
the gas-phase refrigerant in the gas-phase input pipeline (31) flows into the gas-phase heat exchanger (32) and provides cold energy for the natural gas heat exchanger, and flows into the mixed heat exchanger (41) through the gas-phase output pipeline (33); and the liquid-phase refrigerant in the liquid-phase input pipeline (51) flows into the liquid-phase heat exchanger (52) and provides cold energy for the natural gas heat exchanger, and flows into the mixed heat exchanger (41) through the liquid-phase output pipeline (53), and the liquid-phase refrigerant and the gas-phase refrigerant are mixed in the mixed heat exchanger and provide cold energy for the natural gas heat exchanger (22).
2. A cold box adaptive control apparatus according to claim 1, wherein: the natural gas heat exchanger (22), the gas phase heat exchanger (32), the liquid phase heat exchanger (52) and the mixed heat exchanger (41) are arranged in the cold box body, and the cold box further comprises a first temperature measuring device (11) for measuring the temperature of the medium temperature section in the cold box body and a second temperature measuring device (12) for measuring the temperature of the low temperature section.
3. A cold box adaptive control apparatus according to claim 1, wherein: the gas phase input pipeline is provided with a gas phase input flow meter (34) for measuring the flow of the gas phase refrigerant, a gas phase input pressure gauge (35) for measuring the pressure of the gas phase refrigerant and a gas phase input thermometer (36) for measuring the temperature of the gas phase refrigerant; and a gas-phase control valve (37) for controlling the flow of the gas-phase refrigerant is arranged on the gas-phase output pipeline (33).
4. A cold box adaptive control apparatus according to claim 1, wherein: and a mixed output flow meter (44) and a mixed output pressure gauge (44) are arranged on the mixed output pipeline.
5. A control method of a cold box adaptive control device according to any one of claims 1-4, comprising the steps of:
the method comprises the following steps: starting a compressor to convey a refrigerant for a cold box body, and conveying a natural gas raw material into a raw material input pipeline;
step two: measuring the actual temperature of the liquefied natural gas through a natural gas output thermometer, obtaining a temperature difference value by making a difference with the preset temperature of the liquefied natural gas, and carrying out PID (proportion integration differentiation) adjustment on the opening of the liquid phase control valve according to the temperature difference value;
step three: the actual flow of the liquefied natural gas is measured through the natural gas output flow meter, the difference is made between the actual flow and the preset flow of the liquefied natural gas to obtain a flow difference value, and PID (proportion integration differentiation) adjustment is carried out on the opening of the natural gas output control valve according to the flow difference value.
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| CN201911416431.5A CN111090294B (en) | 2019-12-31 | 2019-12-31 | Cold box self-adaptive control device and control method |
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| CN201911416431.5A CN111090294B (en) | 2019-12-31 | 2019-12-31 | Cold box self-adaptive control device and control method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220385A (en) * | 1997-07-24 | 1999-06-23 | 气体产品与化学公司 | Method and apparatus for regulatory control of production and temperature in mixed refrigerant liquefied natural gas facility |
| US20030046953A1 (en) * | 2000-04-25 | 2003-03-13 | Wiveka Jacoba Elion | Controlling the production of a liquefied natural gas product stream |
| US20130160474A1 (en) * | 2011-12-22 | 2013-06-27 | Lennox Industries Inc. | Method to control electronic expansion valve |
| CN103225942A (en) * | 2013-05-16 | 2013-07-31 | 北京安珂罗工程技术有限公司 | Single-circulating mixed refrigerant three-stage throttling refrigerating system and operation control method thereof |
| CN108344251A (en) * | 2017-01-24 | 2018-07-31 | 通用电气石油和天然气有限责任公司 | The continuous mix refrigerant of production for liquefied natural gas (LNG) optimizes |
| CN211698745U (en) * | 2019-12-31 | 2020-10-16 | 合肥万豪能源设备有限责任公司 | Cold box self-adaptive control device |
-
2019
- 2019-12-31 CN CN201911416431.5A patent/CN111090294B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220385A (en) * | 1997-07-24 | 1999-06-23 | 气体产品与化学公司 | Method and apparatus for regulatory control of production and temperature in mixed refrigerant liquefied natural gas facility |
| US20030046953A1 (en) * | 2000-04-25 | 2003-03-13 | Wiveka Jacoba Elion | Controlling the production of a liquefied natural gas product stream |
| US20130160474A1 (en) * | 2011-12-22 | 2013-06-27 | Lennox Industries Inc. | Method to control electronic expansion valve |
| CN103225942A (en) * | 2013-05-16 | 2013-07-31 | 北京安珂罗工程技术有限公司 | Single-circulating mixed refrigerant three-stage throttling refrigerating system and operation control method thereof |
| CN108344251A (en) * | 2017-01-24 | 2018-07-31 | 通用电气石油和天然气有限责任公司 | The continuous mix refrigerant of production for liquefied natural gas (LNG) optimizes |
| CN211698745U (en) * | 2019-12-31 | 2020-10-16 | 合肥万豪能源设备有限责任公司 | Cold box self-adaptive control device |
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