CN115507294A - LNG reserve station unloading method and system based on DCS - Google Patents
LNG reserve station unloading method and system based on DCS Download PDFInfo
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- CN115507294A CN115507294A CN202210704561.4A CN202210704561A CN115507294A CN 115507294 A CN115507294 A CN 115507294A CN 202210704561 A CN202210704561 A CN 202210704561A CN 115507294 A CN115507294 A CN 115507294A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000003860 storage Methods 0.000 claims abstract description 77
- 239000007788 liquid Substances 0.000 claims abstract description 64
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 51
- 230000005856 abnormality Effects 0.000 claims abstract description 7
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 239000007791 liquid phase Substances 0.000 claims description 16
- 238000010926 purge Methods 0.000 claims description 5
- 238000012790 confirmation Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims 1
- 230000004927 fusion Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000009826 distribution Methods 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
- 238000010276 construction 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
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage 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
- 230000008092 positive effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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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
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
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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
- 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
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- 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 reserve station unloading method based on a DCS, comprising the following steps of S1: judging the precondition of unloading the LNG, entering the next step if the precondition is met, and entering an inspection state until the precondition is met; s2: selecting an unloading operation mode, and if the unloading operation mode is the automatic mode, selecting a corresponding execution strategy according to a preset liquid inlet condition; if the mode is the manual mode, the execution strategy is manually changed; s3: detecting whether a valve between the tank car and the storage tank is normal or not, if so, entering a step S4, otherwise, entering a checking state, and entering a step S3 after the valve is detected to eliminate the abnormality; s4: and 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 car into the storage tank. The unified dispatching and interlocking unloading platform of the station control system is realized, and the problem of low fusion degree of the existing unloading platform and the station control system is solved. The operation process and the steps of the LNG storage station are simplified, manual control can be carried out 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 a LNG storage station unloading method and system based on a DCS (distributed control system).
Background
With the development of the national energy storage strategy, the requirements of China on the natural gas storage capacity and the storage technology are higher and higher. LNG storage stations have been rapidly developed in recent years as an important form of natural storage. LNG storage stations 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 pipe network reach the required pressure and keep the supply and demand balance according to the instructions of the dispatching center. The technological process is determined by comparing technical economy according to factors such as the property of an air source plant, the urban scale, the load distribution, the pressure level control of a pipe network and the like. Besides main process equipment such as gas storage, pressure feeding, pressure regulation and the like, the device is also provided with production auxiliary facilities, living facilities, fire fighting facilities and the like according to different requirements. The site selection needs to consider the requirements of the process, power, water supply and drainage, civil construction installation, fire prevention and explosion prevention, environmental protection and the like and the influence on investment and operation, and is coordinated with the overall planning of the city. The process arrangement should ensure reliable operation, safe production and convenient operation management. The unloading system of the LNG is an important component of the LNG storage station. The existing LNG unloading system is mainly realized by an unloading platform, the unloading platform and a station control system perform data interaction in a communication mode, and data display and 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 mainly has the following defects: the unloading process of the LNG is difficult to be well controlled, and the whole LNG storage station control system (hereinafter referred to as a station control system) cannot reliably realize unified dispatching and interlocking of the station control system. When the LNG unloading operation needs to simultaneously operate the unloading platform control system and the station control system, the operation steps are complicated and easy to make mistakes.
Disclosure of Invention
The invention aims to provide an unloading method of an LNG storage station based on a DCS (distributed control system) to solve the technical problem of complex operation and easy error.
In order to solve the problems, the technical scheme of the invention is as follows:
an unloading method of an LNG storage station based on a DCS comprises the following steps:
s1: judging the precondition of unloading the LNG, entering the step S2 if the precondition is met, or entering the inspection state, and entering the step S1 after the abnormality is detected and eliminated;
s2: selecting an unloading operation mode, and if the unloading operation mode is the automatic mode, selecting a corresponding execution strategy according to a preset liquid inlet condition; if the mode is the manual mode, the execution strategy is manually changed;
s3: detecting whether a valve between the tank car and the storage tank is normal or not, if so, entering a step S4, otherwise, entering a checking state, and entering a step S3 after the valve is detected to eliminate the abnormality;
s4: and 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 car into the storage tank.
The judgment of the precondition 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 the unloading process is faultless and not in a static electricity releasing state, a compressor for unloading is in a normal standby faultless state, and an emptying torch is in a normal state.
The automatic mode is that the storage tanks allowing liquid inlet are judged based on the precondition, if at least two storage tanks meet the precondition and can be used for liquid inlet, liquid level comparison is carried out, and the storage tank with the lower liquid level is automatically selected as a liquid inlet 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 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, otherwise, the upper liquid inlet mode is selected.
The manual mode is a storage tank which is allowed to feed liquid based on the precondition, a liquid feeding mode is given according to the density of the liquid phase in the tank car and the density of the liquid phase in the storage tank, and a manually selectable liquid feeding target storage tank and a liquid feeding mode are given.
Specifically, step S4 specifically includes the following steps
S41: receiving confirmation signals of parking space fixation, electrostatic grounding, tank car connection and pipeline purging replacement completion;
s42: displaying the unloading platform capable of executing unloading operation, and confirming the unloading platform capable of executing unloading;
s43: performing fault self-checking on the unloading platform, feeding back when the unloading platform is normal by self-checking, and entering the step S44, otherwise entering a checking state, and entering the step S43 after the unloading platform is detected to eliminate the abnormality;
s44: starting the unloading platform and relevant valves of the unloading process, and executing unloading operation;
s45: and closing the unloading platform and keeping the state of the relevant valve until the next unloading operation.
Further preferably, in step S44, an SIS system is further provided to perform interlocking scheduling with the DCS system, and the unloading job is scheduled together.
An LNG reserve station unloading system based on a DCS (distributed control system) is applied to the LNG reserve station unloading method based on the DCS, and comprises a main control unit, a collection unit and an execution unit;
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 cut-off 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 unloading operation.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
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 unified dispatching and interlocking of the station control system are realized, and the problem that the integration degree of the existing unloading platform and the station control system is not high is solved.
2) The operation process and steps of the LNG storage station are simplified, and LNG unloading operation one-key operation is realized on the station control system.
3) Compromise the LNG storage station operation flow manual operation of unloading, can carry out people according to actual demand for controlling, improve the flexibility ratio.
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 of an unloading method of an LNG storage station based on a DCS system according to the present invention;
fig. 2 is a block diagram of an unloading system of an LNG storage station 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 be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
The unloading method and system for the LNG storage station based on the DCS system according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.
Example 1
Referring to fig. 1, the embodiment provides an unloading method for an LNG storage station based on a DCS system, and the embodiment only needs to implement unified scheduling and interlocking unloading platforms through a station control system. The existing unloading platform and station control system realize monitoring and control of the unloading platform in an industrial communication mode, and the monitoring and control of the unloading platform are modified into a mode of combining IO signal monitoring and industrial communication monitoring, namely, signals of starting, stopping, fault, ESD emergency stop, unloading pressure remote control, parking space fixing, electrostatic grounding, tank car connection and pipeline purging replacement completion of the loading platform are increased and are directly monitored by the station control system IO signal. 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, so that the unloading platform is embedded into the whole station control flow of the gas storage, the deep fusion of the unloading platform and the station control flow is realized, and one-key unloading control is realized.
The implementation process of the embodiment comprises the following steps:
firstly, in step S1, before unloading, the LNG unloading precondition is determined, and if the precondition is satisfied, the next step proceeds to step S2. Otherwise, entering a checking state, manually detecting, executing precondition judgment after reasons are eliminated, repeating the step S1 until precondition judgment is met, and entering the step S2. Wherein, the precondition is satisfied only when the precondition meets the following points, and the pressure of the storage tank is judged: the pressure in the two storage tanks storing the liquefied natural gas is less than a preset threshold value. Judging the liquid level of the storage tank: each storage tank all sets up three level gauge, reads two of them level gauges and obtains the liquid level of storage tank to judge respectively whether the liquid level of two storage tanks has or not reached the liquid level upper limit, and need the liquid level of one of them storage tank not reach the upper limit at least. And (3) judging the state of the emergency cut-off valve related to the unloading process: the quick action valves on the inlet lines of the two storage tanks and the quick action valves on the inlet lines are not in fault and are not in the ESD state. And judging that the station control SIS system is in a normal operation state. Compressor condition determination: the unloading compressor is in a normal standby state and a fault-free state. And (3) emptying a torch state: the state of the emptying torch is in a normal state.
Then, in step S2, an unloading operation mode is selected, and if the unloading operation mode is the automatic mode, a corresponding execution strategy is selected according to a preset liquid inlet condition. Specifically, in the automatic mode, if the two storage tanks allow liquid inlet, the judgment is carried out according to the liquid level, and the storage tank with the low liquid level is automatically selected as a liquid inlet target storage tank; if only one tank allows the feed, that tank is selected. After the storage tank is selected, the liquid inlet mode is automatically selected according to the comparison and judgment between the density of the liquid phase in the tank wagon and the density of the liquid phase in the liquid inlet target storage tank, the liquid inlet mode comprises an upper liquid inlet mode and a lower liquid inlet mode, if the density of the liquid phase in the tank wagon is larger than the density of the liquid phase in the storage tank, the lower liquid inlet mode is selected, and otherwise, the upper liquid inlet mode is selected.
In the same way, in the manual mode, the storage tank allowing liquid inlet is judged according to the precondition, and storage tank options capable of selecting liquid inlet are provided for manual selection. Then, the liquid inlet mode options are given according to the liquid phase density in the tank car and the liquid phase density of the storage tank, and therefore the liquid inlet mode is manually selected.
And then, in step S3, detecting whether a valve between the tank car and the storage tank is normal, if so, performing the next step to step S4, otherwise, performing an inspection state, manually detecting, and executing step S3 after reasons are eliminated.
Finally, in step S4, the controller of the platform to be unloaded on site sends a confirmation signal indicating that the parking space is fixed, the electrostatic grounding, the tank car connection, and the pipeline purging replacement are completed to the station control system. And displaying the unloading platform capable of executing the unloading operation according to the confirmation signal, and confirming the unloading platform capable of executing the unloading operation. And (4) carrying out fault self-checking on the unloading platform, feeding back the unloading platform after the self-checking is normal, and entering the next step, or entering the next step after the unloading platform is detected to eliminate the abnormality. After the conditions are met, the unloading platform and relevant valves and equipment of the unloading process are started, and unloading operation is executed. More than two compressors are in failure in the unloading process, and the unloading process is immediately stopped. 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. Wherein, the station control system is through DCS system and SIS system dispatch execution unloading operation jointly, and the DCS system: the distributed control system is a new generation instrument control system based on a microprocessor and adopting the design principle of distributed control function, centralized display operation, and consideration of division, autonomy and comprehensive coordination. SIS: is a safety instrumented system, named according to the american instrument association (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 an unloading method of an LNG storage station based on a DCS system as in embodiment 1 is mainly implemented by the DCS system supplemented with an SIS system, and includes a main control unit, a collection unit, and an execution unit.
The acquisition unit is internally provided with a DCS switching value input module, a DCS analog input module, a 485 communication module and an SIS switching value input module, wherein the SIS analog input module is used for respectively acquiring the pressure in the storage tank, the liquid level of the liquefied natural gas in the storage tank and the state of an emergency cut-off valve related to the unloading process, and the compressor for unloading is in a state and an emptying torch state. The system comprises a DCS switching value input module and a DCS analog value input module which are arranged through an acquisition unit, and is used for acquiring a compressor state signal (including a standby state and an operation state), a unloading platform state signal (including a fault, an ESD emergency stop, an unloading pressure remote control, a departure station fixing, an electrostatic grounding, a tank car connecting and pipeline purging replacement completing signal), 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 acquires other parameters of the unloading platform except for signal line connection through modbus _ tcp communication. The collected signals and data are uploaded 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 a corresponding control signal to the execution module. The main control unit comprises a DCS main control module and an SIS main control module, and the redundancy 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 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 the DCS switching value output module of the execution unit, so as to drive the compressor, the unloading platform, the liquid inlet valve, and the gas inlet valve on site, and perform the LNG unloading operation by performing sequential operations as required. The SIS main control module in the main control unit compares unloading platform pressure, LNG storage tank liquid level and unloading platform pressure data uploaded by the SIS switching value input module and the SIS analog value input module with preset high limit values, and once the parameters exceed the high limit values or a stop signal sent by an emergency stop button is received, the unloading stop signal is output to the SIS switching value output module in the execution unit, the unloading platform, the compressor and the tank inlet valve (including an emergency cut-off valve on an air inlet pipeline and an emergency cut-off valve on the liquid inlet pipeline) are stopped, LNG unloading operation is stopped, interlocking protection of the LNG unloading operation is achieved, and site safety is guaranteed.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (7)
1. An unloading method of an LNG storage station based on a DCS is characterized by comprising the following steps:
s1: judging the precondition of unloading the LNG, entering the step S2 if the precondition is met, or entering the inspection state, and entering the step S1 after the abnormality is detected and eliminated;
s2: selecting an unloading operation mode, and if the unloading operation mode is the automatic mode, selecting a corresponding execution strategy according to a preset liquid inlet condition; if the mode is the manual mode, the execution strategy is manually changed;
s3: detecting whether a valve between the tank car and the storage tank is normal or not, if so, entering a step S4, otherwise, entering a checking state, and entering a step S3 after the valve is detected to be abnormal;
s4: and 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 car into the storage tank.
2. The DCS-based LNG storage station unloading method of claim 1, wherein the judgment of the precondition comprises that the pressure in the storage tank is less than a preset threshold value, the liquid level of the liquefied natural gas in the storage tank does not reach an upper limit, an emergency cut-off valve related to the unloading process is not in fault and is not in an electrostatic discharge state, a compressor for unloading is in a normal standby non-fault state, and an emptying torch is in a normal state.
3. The DCS-based LNG depot unloading method of claim 2, wherein the automatic mode is a tank that is determined to allow liquid inlet based on the precondition, and if at least two tanks satisfy the precondition and liquid inlet is possible, liquid level comparison is performed, and a tank with a lower liquid level is automatically selected as a target tank for liquid inlet; and automatically selecting a liquid inlet mode according to the liquid phase density in the tank car 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 DCS-based LNG storage station unloading method of claim 2, wherein the manual mode is a storage tank which is judged to allow liquid inlet based on the precondition, a liquid inlet mode is given according to the density of the liquid phase in the tank car and the density of the liquid phase in the storage tank, and a manually selectable liquid inlet target storage tank and liquid inlet mode are given.
5. The DCS-based LNG depot unloading method of claim 2, wherein the step S4 comprises the following steps
S41: receiving confirmation signals of completion of parking space fixation, electrostatic grounding, tank car connection and pipeline purging replacement;
s42: displaying the unloading platform capable of executing unloading operation, and confirming the unloading platform capable of executing unloading;
s43: performing fault self-checking on the unloading platform, feeding back the unloading platform when the unloading platform is normal, and entering the step S44, otherwise entering a checking state, and entering the step S43 after the unloading platform is detected to eliminate the abnormality;
s44: starting the unloading platform and relevant valves of the unloading process, and executing unloading operation;
s45: and closing the unloading platform, and keeping the state of the relevant valve until the next unloading operation.
6. The DCS-based LNG reserve station unloading method of claim 5, wherein in the step S44, an SIS system unified in interlocking scheduling with the DCS system is further provided to jointly schedule unloading operation, wherein the DCS system and the SIS system cooperate in unified scheduling.
7. An unloading system of an LNG reserve station based on a DCS system, which applies the unloading method of the LNG reserve station based on the DCS system as claimed in any one of claims 1 to 6, and is characterized by comprising a main control unit, a collection unit and an execution unit
The system comprises a storage tank, a plurality of acquisition modules, a compressor for unloading, a plurality of storage tanks, a plurality of unloading valves and a plurality of unloading valves, wherein the acquisition modules are arranged in the storage tanks and used for respectively acquiring the pressure in the storage tanks, the liquid level of the liquefied natural gas in the storage tanks, the emergency cut-off valve state related to the unloading process, the state of the 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 module is in signal connection with the main control unit and is used for receiving the control signal and executing or stopping unloading operation.
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