CN115507294B - LNG storage station unloading method and system based on DCS system - Google Patents
LNG storage station unloading method and system based on DCS system Download PDFInfo
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- CN115507294B CN115507294B CN202210704561.4A CN202210704561A CN115507294B CN 115507294 B CN115507294 B CN 115507294B CN 202210704561 A CN202210704561 A CN 202210704561A CN 115507294 B CN115507294 B CN 115507294B
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- 238000003860 storage Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 65
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 53
- 238000007689 inspection Methods 0.000 claims abstract description 8
- 230000005856 abnormality Effects 0.000 claims abstract description 5
- 239000007791 liquid phase Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 230000004927 fusion Effects 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000013439 planning Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000012384 transportation and delivery Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an LNG storage station unloading method based on a DCS system, which comprises the following steps of S1: judging the pre-condition of LNG unloading, if the pre-condition is met, entering the next step, otherwise, entering an inspection state until the pre-condition is met; s2: selecting an unloading operation mode, and selecting a corresponding execution strategy according to a preset liquid inlet condition if the unloading operation mode is an automatic mode; if the mode is the manual mode, the execution strategy is manually changed; s3: detecting whether a valve between the tank wagon and the storage tank is normal, if so, entering a step S4, otherwise, entering an inspection state, and entering a step S3 after abnormality is detected and removed; s4: and (3) receiving a signal of the unloading platform, and controlling the unloading platform according to the execution strategy obtained in the step (S2) so as to send the liquefied natural gas in the tank wagon into the storage tank. The unified dispatching and interlocking of the station control system are realized, and the problem of low fusion degree of the existing car unloading platform and the station control system is solved. The operation flow and steps of the LNG storage station are simplified, manual control can be performed according to actual requirements, and the flexibility is improved.
Description
Technical Field
The invention belongs to the field of industrial control, and particularly relates to an LNG storage station unloading method and system based on a DCS system.
Background
With the strategic development of national energy reserves, the reserve quantity and the reserve technical requirements of China on natural gas are higher and higher. LNG storage stations have been rapidly developed in recent years as an important form of natural storage. LNG reserves serve as facilities for storing and distributing natural gas in urban natural gas systems. The main function is to make the natural gas transmission and distribution network reach the required pressure and keep the balance of supply and demand according to the instruction of the dispatching center. The technological process is determined by comparing the technical and economic factors according to the characteristics of an air source plant, the urban scale, the load distribution, the pipe network pressure grading and the like. Besides the main process equipment such as gas storage, pressure delivery, pressure regulation and the like, production auxiliary facilities, living facilities, fire-fighting facilities and the like are also arranged according to different requirements. The site selection is to consider the requirements of technology, power, water supply and drainage, civil engineering installation, fire prevention and explosion prevention, environmental protection and the like and the influence of the requirements on investment and operation, and is coordinated with the urban overall planning. The process arrangement should ensure reliable operation, safe production and convenient operation and management. Among them, LNG unloading systems are more important components of LNG storage stations. The existing LNG unloading system is mainly realized by means of an unloading platform, the unloading platform and the station control system perform data interaction in a communication mode, and the data display and the setting of some simple parameters of the unloading platform are only performed on a monitoring interface of an upper computer of the station control system.
The prior art has the following defects: the control of the unloading flow of the LNG is difficult to realize in the whole LNG storage station control system (hereinafter referred to as station control system), and the unified dispatching and the interlocking unloading platform of the station control system cannot be reliably realized. The LNG unloading operation needs to operate the unloading platform control system and the station control system simultaneously, and the operation steps are complicated and easy to make mistakes.
Disclosure of Invention
The invention aims to provide an LNG storage station unloading method based on a DCS system, so as to solve the technical problems of complex operation and easy error.
In order to solve the problems, the technical scheme of the invention is as follows:
an LNG storage station unloading method based on a DCS system comprises the following steps:
s1: judging the LNG unloading pre-condition, if the LNG unloading pre-condition is met, entering a step S2, otherwise, entering an inspection state, and entering a step S1 after the LNG unloading pre-condition is detected and the LNG unloading pre-condition is removed;
S2: selecting an unloading operation mode, and selecting a corresponding execution strategy according to a preset liquid inlet condition if the unloading operation mode is an automatic mode; if the mode is the manual mode, the execution strategy is manually changed;
s3: detecting whether a valve between the tank wagon and the storage tank is normal, if so, entering a step S4, otherwise, entering an inspection state, and entering a step S3 after abnormality is detected and removed;
S4: and (3) receiving a signal of the unloading platform, and controlling the unloading platform according to the execution strategy obtained in the step (S2) so as to send the liquefied natural gas in the tank wagon into the storage tank.
The judging of the pre-condition comprises that the pressure in the storage tank is smaller than a preset threshold value, the liquid level of liquefied natural gas in the storage tank does not reach an upper limit, an emergency cut-off valve related to a unloading process is fault-free and is not in an electrostatic discharge state, the compressor for unloading is in a normal standby fault-free state, and the emptying torch is in a normal state.
The automatic mode is to judge the storage tanks allowing liquid to enter based on the pre-conditions, if at least two storage tanks meet the pre-conditions and liquid can enter, liquid level comparison is carried out, and the storage tank with lower liquid level is automatically selected as a liquid entering target storage tank; and automatically selecting a liquid inlet mode according to the liquid phase density in the tank wagon and the liquid phase density of the liquid inlet target storage tank, wherein the liquid inlet mode comprises upper liquid inlet or lower liquid inlet, and selecting a lower liquid inlet mode if the liquid phase density in the tank wagon is greater than the liquid phase density in the storage tank, and otherwise, selecting an upper liquid inlet mode.
The manual mode is to judge a liquid inlet-allowed storage tank based on a pre-condition, give a liquid inlet mode according to the liquid phase density in the tank wagon and the liquid phase density of the storage tank, and give a liquid inlet target storage tank and a liquid inlet mode which can be selected manually.
Specifically, step S4 specifically includes the steps of
S41: receiving confirmation signals of fixed parking spaces, electrostatic grounding, tank wagon connection and completion of pipeline blowing replacement;
S42: displaying a car unloading platform capable of executing car unloading operation, and confirming the car unloading platform for executing car unloading;
s43: performing fault self-checking on the unloading platform, feeding back the self-checking normal state and entering a step S44, otherwise entering a checking state, and entering a step S43 after the abnormal state is detected and removed;
s44: starting relevant valves of the unloading platform and the unloading process, and executing unloading operation;
s45: closing the unloading platform, and keeping the state of the related valve until the next unloading operation.
Further preferably, in step S44, an SIS system that is uniformly interlocked with the DCS system is further provided to schedule the unloading operation together.
The LNG storage station unloading system based on the DCS system comprises a main control unit, an acquisition unit and an execution unit, wherein the LNG storage station unloading method based on the DCS system is applied to any one of the above;
the acquisition unit is internally provided with a plurality of acquisition modules which are used for respectively acquiring the pressure in the storage tank, the liquid level of liquefied natural gas in the storage tank, the state of an emergency stop valve related to the unloading process, the state of a compressor for unloading and the state of an emptying torch;
The main control unit is in signal connection with the acquisition unit and is used for receiving and analyzing the data of the acquisition unit so as to output corresponding control signals to the execution unit;
the execution unit is in signal connection with the main control unit and is used for receiving the control signal and executing or stopping the unloading operation.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
1) The control of the unloading platform in the LNG double-storage-tank storage station is deeply integrated into the station control system, so that the unified dispatching and interlocking unloading platform of the station control system is realized, and the problem of low integration degree of the existing unloading platform and the station control system is solved.
2) The operation flow and steps of the LNG storage station are simplified, and one-key operation of LNG unloading operation is realized on the station control system.
3) The manual operation of the unloading operation flow of the LNG storage station is considered, manual operation can be performed according to actual requirements, and the flexibility is improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a flow chart diagram of an LNG storage station unloading method based on a DCS system;
Fig. 2 is a block diagram of a system for unloading LNG storage stations based on a DCS system according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
The invention provides an LNG storage station unloading method and system based on a DCS system, which are further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Example 1
Referring to fig. 1, the embodiment provides a LNG storage station unloading method based on a DCS system, and the embodiment only needs to realize unified dispatching and interlocking unloading platform through a station control system. The existing unloading platform and the station control system are used for realizing monitoring and control of the unloading platform in an industrial communication mode, and the mode of combining IO signal monitoring and industrial communication monitoring is modified, namely, starting, stopping, faults, emergency stopping of ESD (electro-static discharge) of the loading platform, remote control of unloading pressure, fixation of an unloading position, electrostatic grounding, tank wagon connection and pipeline blowing replacement completion signals are added, and the signals are directly monitored by the IO signal of the station control system. Other signals are monitored using industrial communications. By means of the IO signals, the station control system dispatches the unloading platform to act through sequential control and logic interlocking, and thus the unloading platform is embedded into the whole station control flow of the gas storage, and the two are fused deeply, so that one-key unloading control is realized.
The implementation process of the embodiment comprises the following steps:
First, in step S1, before unloading is performed, LNG unloading preconditions are required to be determined, and if the preconditions are satisfied, the next step is continued to step S2. Otherwise, entering an inspection state, detecting by manpower, removing the reason, then executing the precondition judgment, and repeating the step S1 until the precondition is met, and entering the step S2. The precondition is met by the following points, and the pressure of the storage tank is judged: the pressure in the two tanks storing lng is less than a preset threshold. Judging the liquid level of the storage tank: each storage tank is provided with three liquid level meters, and the liquid level of the storage tank is obtained by reading two liquid level meters, so that whether the liquid level of the two storage tanks reaches the upper limit of the liquid level or not is judged respectively, and the liquid level of at least one storage tank is required to be lower than the upper limit. Emergency cut-off valve status determination related to the unloading process: the emergency shut-off valve on the intake line and the emergency shut-off valve on the intake line of the two tanks are fault-free and not in an ESD state. And judging that the station control SIS system is in a normal running state. And (3) judging the condition of the compressor: the compressor for unloading is in a normal standby state and a fault-free state. Venting flare state: the flare state is in a normal state.
Then, in step S2, a discharging operation mode is selected, and if the discharging operation mode is an automatic mode, a corresponding execution strategy is selected according to a preset liquid inlet condition. Specifically, if both the two storage tanks allow liquid inlet in the automatic mode, judging according to the liquid level, and automatically selecting the storage tank with low liquid level as a liquid inlet target storage tank; if only one reservoir is allowed to feed, that reservoir is selected. After the storage tank is selected, comparing and judging the liquid phase density in the tank wagon with the liquid phase density of the liquid inlet target storage tank, and automatically selecting a liquid inlet mode, wherein the liquid inlet mode comprises upper liquid inlet and lower liquid inlet, if the liquid phase density in the tank wagon is greater than the liquid phase density in the storage tank, the lower liquid inlet mode is selected, and otherwise, the upper liquid inlet mode is selected.
Similarly, in the manual mode, the storage tank allowing liquid to enter is judged according to the pre-condition, and a storage tank option capable of selecting liquid to enter is provided for manual selection. Then, the liquid phase density in the tank wagon and the liquid phase density of the storage tank are provided with liquid inlet mode options, so that the liquid inlet mode is manually selected.
Then, in step S3, it is detected whether the valve between the tank wagon and the storage tank is normal, if so, the next step is performed to step S4, otherwise, the inspection state is entered, the detection is performed manually, and after the reason is eliminated, step S3 is performed.
Finally, in step S4, the controller of the platform to be unloaded on site gives confirmation signals of the completion of the parking space fixation, the electrostatic grounding, the tank wagon connection, and the pipeline purging replacement to the station control system, respectively. And displaying the unloading platform capable of executing unloading operation according to the confirmation signal, and confirming the unloading platform for executing unloading operation. And performing fault self-checking on the unloading platform, feeding back the self-checking normally and entering the next step, or else, entering the next step after the abnormality is removed after the detection. After the conditions are met, the relevant valves and equipment of the unloading platform and the unloading flow are started, and the unloading operation is executed. In the unloading operation process, more than two compressors are in fault, and the unloading process is stopped immediately. And after the unloading operation is finished, closing the unloading platform, and keeping the state of the liquid inlet valve until the next unloading operation is started. The station control system performs unloading operation through the joint scheduling of the DCS system and the SIS system, and the DCS system: the distributed control system is a new generation instrument control system based on a microprocessor and adopting the design principles of distributed control functions, centralized display operation and both autonomous and comprehensive coordination. SIS: is a safety instrumented system, named according to the american instrumentation Institute (ISA) definition of a safety system control system.
Example 2
Referring to fig. 2, the present embodiment provides an LNG storage station unloading system based on a DCS system, and the LNG storage station unloading method based on the DCS system according to embodiment 1 is implemented mainly by the DCS system assisted by an SIS system, and includes a main control unit, an acquisition unit and an execution unit.
The acquisition unit is internally provided with a DCS switching value input module, a DCS analog value input module, a 485 communication module and an SIS switching value input module, wherein the SIS analog value input module is used for respectively acquiring the pressure in the storage tank, the liquid level of liquefied natural gas in the storage tank, the emergency cut-off valve state related to the unloading process, the state of the compressor for unloading and the state of the emptying torch. The DCS switching value input module and the DCS analog value input module are arranged through the acquisition unit, and acquire a compressor state signal (comprising a standby state and an operating state), a unloading platform state signal (comprising a fault, an ESD emergency stop, unloading pressure remote control, unloading position fixing, electrostatic grounding, tank wagon connection and pipeline blowing replacement completion signals), a torch state, a storage tank liquid level signal, a tank inlet valve state signal and a densimeter signal. And a 485 communication module in the acquisition unit is used for acquiring other parameters of the unloading platform except the signal line connection through modbus_tcp communication. And uploading the acquired signals and data to a DCS main control module in the main control unit.
The main control unit is in signal connection with the acquisition unit and is used for receiving and analyzing the data of the acquisition module so as to output corresponding control signals to the execution module. The main control unit comprises a DCS main control module and an SIS main control module, and the redundancy arrangement of the modules improves the reliability of the embodiment.
The execution module is in signal connection with the main control unit and is used for receiving the control signal and executing or stopping the unloading operation. The execution unit includes: the device comprises a DCS analog quantity output module, a DCS switching quantity output module and an SIS switching quantity output module.
The DCS master control module calculates the uploaded signal data according to the method described in embodiment 1, and outputs the calculation result to the DCS modulus output module and DCS switching value output module of the execution unit, to drive the on-site compressor, unloading platform, liquid inlet valve and air inlet valve, to perform sequential actions as required, and to execute LNG unloading operation. And the SIS main control module in the main control unit compares the data of the unloading platform pressure, the LNG storage tank liquid level and the unloading platform pressure uploaded by the SIS switching value input module and the SIS analog value input module with a preset high Gao Xianzhi, and once the parameter exceeds a high limit value or a stopping signal sent by an emergency stop button is received, the unloading stopping signal is output to the SIS switching value output module in the execution unit, the unloading platform, the compressor and the tank inlet valve (comprising an emergency stop valve on an air inlet pipe line and an emergency stop valve on an air inlet pipe line) are stopped, the LNG unloading operation is stopped, the interlocking protection of the LNG unloading operation is realized, and the site safety is ensured.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (5)
1. The LNG storage station unloading method based on the DCS system is characterized by comprising the following steps of:
s1: judging the LNG unloading pre-condition, if the LNG unloading pre-condition is met, entering a step S2, otherwise, entering an inspection state, and entering the step S1 after the detection and the elimination of the abnormality;
S2: selecting an unloading operation mode, and selecting a corresponding execution strategy according to a preset liquid inlet condition if the unloading operation mode is an automatic mode; if the mode is the manual mode, the execution strategy is manually changed;
S3: detecting whether a valve between the tank wagon and the storage tank is normal, if so, entering a step S4, otherwise, entering an inspection state, and entering the step S3 after abnormality is detected and removed;
S4: receiving a signal of a car unloading platform, and controlling the car unloading platform according to the execution strategy obtained in the step S2 so as to send the liquefied natural gas in the tank wagon into the storage tank;
the step S4 specifically includes the following steps:
s41: receiving confirmation signals of fixed parking spaces, electrostatic grounding, tank wagon connection and completion of pipeline blowing replacement;
S42: displaying a car unloading platform capable of executing car unloading operation, and confirming the car unloading platform for executing car unloading;
S43: performing fault self-checking on the unloading platform, feeding back the self-checking normal state and entering a step S44, otherwise entering a checking state, and entering the step S43 after the abnormal state is detected and removed;
s44: starting relevant valves of the unloading platform and the unloading process, and executing unloading operation;
s45: closing the unloading platform, and keeping the state of the related valve until the next unloading operation;
In the step S44, an SIS system that is uniformly interlocked with the DCS system is further provided to jointly schedule the unloading operation, wherein the DCS system and the SIS system are matched to perform uniform scheduling.
2. The LNG storage station unloading method based on the DCS system according to claim 1, wherein the judging of the precondition includes that the pressure in the storage tank is less than a preset threshold, the liquid level of the liquefied natural gas in the storage tank does not reach an upper limit, an emergency shut-off valve associated with the unloading process is not failed and is not in an electrostatic discharge state, the compressor for unloading is in a normal standby non-failure state, and the emptying torch is in a normal state.
3. The unloading method of the LNG storage station based on the DCS system according to claim 2, wherein the automatic mode is to judge the storage tanks allowing liquid to enter based on the pre-condition, if at least two storage tanks meet the pre-condition and liquid can enter, liquid level comparison is carried out, and the storage tank with lower liquid level is automatically selected as a liquid entering target storage tank; and automatically selecting a liquid inlet mode according to the liquid phase density in the tank wagon and the liquid phase density of the liquid inlet target storage tank, wherein the liquid inlet mode comprises upper liquid inlet or lower liquid inlet.
4. The unloading method of the LNG storage station based on the DCS system according to claim 2, wherein the manual mode is to judge a liquid inlet-allowed storage tank based on the pre-condition, give a liquid inlet mode according to the liquid phase density in the tank wagon and the liquid phase density of the storage tank, and give a liquid inlet target storage tank and a liquid inlet mode which can be selected manually.
5. An LNG storage station unloading system based on a DCS system, applying the LNG storage station unloading method based on the DCS system as claimed in any one of claims 1 to 4, comprising a main control unit, an acquisition unit and an execution unit;
The system comprises a storage tank, an unloading process, an emergency cut-off valve state, an unloading compressor and an unloading torch state, wherein the storage tank is internally provided with a plurality of acquisition modules which are used for respectively acquiring the pressure in the storage tank, the liquid level of liquefied natural gas in the storage tank and the emergency cut-off valve state related to the unloading process;
the main control unit is in signal connection with the acquisition unit and is used for receiving and analyzing the data of the acquisition unit so as to output corresponding control signals to the execution unit;
the execution unit is in signal connection with the main control unit and is used for receiving the control signal and executing or stopping the unloading operation.
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