CN112304380A - Method for circularly accumulating natural gas flow in distributed control system - Google Patents

Method for circularly accumulating natural gas flow in distributed control system Download PDF

Info

Publication number
CN112304380A
CN112304380A CN202011140306.9A CN202011140306A CN112304380A CN 112304380 A CN112304380 A CN 112304380A CN 202011140306 A CN202011140306 A CN 202011140306A CN 112304380 A CN112304380 A CN 112304380A
Authority
CN
China
Prior art keywords
flow
natural gas
shift
control system
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011140306.9A
Other languages
Chinese (zh)
Other versions
CN112304380B (en
Inventor
谈博
陈志刚
张钢
牛利涛
刘世雄
辛志波
王涛
谭祥帅
宋晓辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202011140306.9A priority Critical patent/CN112304380B/en
Publication of CN112304380A publication Critical patent/CN112304380A/en
Application granted granted Critical
Publication of CN112304380B publication Critical patent/CN112304380B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/15—Correlation function computation including computation of convolution operations
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/33—Director till display
    • G05B2219/33273—DCS distributed, decentralised controlsystem, multiprocessor
    • 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]

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computing Systems (AREA)
  • Automation & Control Theory (AREA)
  • Algebra (AREA)
  • Quality & Reliability (AREA)
  • Fluid Mechanics (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • Manufacturing & Machinery (AREA)
  • Feedback Control In General (AREA)

Abstract

The invention discloses a method for circularly accumulating natural gas flow in a decentralized control system, which comprises the following steps of: 1) natural gas instantaneous flow Q of pressure regulating station inlet measured by pressure regulating station inlet flowmeter0(ii) a 2) Calculating the natural gas instantaneous flow Q of a sampling periodi(ii) a 3) Setting the total accumulated flow of the kth sampling period as L0(ii) a 4) Dividing the total circulation accumulated flow time into a plurality of groups, wherein the total single circulation time of the t-th group is Mt(h) Dividing the total time of a single cycle into NtEach shift, wherein the time length of each shift is mt(h)，Mt＝mt×Nt(ii) a 5) The circulation accumulated flow of each shift in each group is obtained to complete the circulation accumulation of the natural gas flow in the distributed control system, and the method can realize the automatic circulation of the natural gas flowAnd (6) accumulating.

Description

Method for circularly accumulating natural gas flow in distributed control system
Technical Field
The invention belongs to the technical field of industrial information control, and relates to a method for circularly accumulating natural gas flow in a decentralized control system.
Background
With the transformation adjustment of national energy structures, compared with the high emission of coal and petroleum, the instability of wind energy and solar energy and the safety risk of nuclear energy, the low-carbon clean natural gas is becoming the development direction of energy consumption. In the industrial production process, the accurate recording of the accumulated flow of the natural gas usage in the shift is an important index for measuring the enterprise operation management level.
A Distributed Control System (DCS) is a multi-level computer Control System consisting of a process Control level and a process monitoring level. The basic ideas of centralized management and decentralized control are adopted to complete the functions of monitoring and controlling production equipment in real time, and the method is widely applied to industries such as electric power, metallurgy, petrochemical industry and the like. For the convenience of actual programming of engineers, the programs of the distributed control system are compiled by imaging logic configuration languages, but the difficulty of realizing loop iteration is increased.
Disclosure of Invention
The present invention aims to overcome the disadvantages of the prior art and to provide a method for cyclically accumulating natural gas flow in a decentralized control system, which enables automatic cyclic accumulation of natural gas flow.
In order to achieve the above object, the method for cyclically accumulating the natural gas flow in the decentralized control system according to the present invention comprises the following steps:
1) natural gas instantaneous flow Q of pressure regulating station inlet measured by pressure regulating station inlet flowmeter0Then sending the data to a distributed control system;
2) the distributed control system calculates the natural gas instantaneous flow Q of a sampling periodi；
3) When the preset input time is reached, the cumulative natural gas flow is recorded, wherein the total cumulative flow of the kth sampling period is set to be L0；
4) Dividing the total circulation accumulated flow time into a plurality of groups, wherein the total single circulation time of the t-th group is Mt(h) Dividing the total time of a single cycle into NtEach shift, wherein the time length of each shift is mt(h)，Mt＝mt×Nt；
5) Calculating the cumulative time k of the current cycle divided by MtRemainder k of x 36000t；
6) When remainder ktIn the range of 1 to 36000 x mtCumulative flow L of the 1 st shift of the t group at the k sampling time within the sampling timet1Comprises the following steps:
Figure BDA0002738065470000021
7) repeating the step 6), and calculating the accumulated flow of each shift of the tth group, wherein the accumulated flow of the pth shift of the tth group is LtpWhen k istAt 36000X (p-1). times.mt+1～36000×p×mtWithin the sampling time, the cumulative flow L of the pth group and the pth shift of the kth sampling timetpComprises the following steps:
Figure BDA0002738065470000022
8) when remainder ktAt 36000 xMt-36000×mt+1～36000×MtWithin the sampling time of (c), then the nth group of the kth sampling timetCumulative flow L of shiftt,NtComprises the following steps:
Figure BDA0002738065470000023
9) and (6), 7) and 8) are repeated to obtain the circulating accumulated flow of each shift in each group, and the circulating accumulation of the natural gas flow in the distributed control system is completed.
Further comprising: the total accumulated flow L0Current cumulative flow (L) of each shift of group 111,L12,……,L1N1) … …, current cumulative flow (L) of each shift of the t-th groupt1,Lt2,……,LtNt) Stored in a history repository.
Instantaneous flow Q of natural gas for one sampling periodiComprises the following steps:
Figure BDA0002738065470000031
wherein the sampling period is 100 ms;
when Q is0≤20Nm3When the sampling time is/h, the natural gas instantaneous flow at the current sampling time is zero, and when the sampling time is Q0＞20Nm3At the hour of/h, the instantaneous flow of the natural gas at the current sampling moment is Qi。
Total cumulative flow L for the kth sampling period0Comprises the following steps:
Figure BDA0002738065470000032
the invention has the following beneficial effects:
the method for circularly accumulating the natural gas flow in the distributed control system utilizes the distributed control system to calculate the accumulated flow L by grouping and classifying times during specific operationt1Therefore, the circulation accumulated flow of each shift in each group is obtained, the automatic circulation accumulation of the natural gas flow is realized, and the automation degree of monitoring, recording, predicting and controlling the natural gas flow by operators is improved. The flow of the natural gas is accurately and reliably monitored.
Drawings
FIG. 1 is a general diagram of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a configuration diagram of the total cumulative natural gas flow in the decentralized control system according to the present invention;
FIG. 4 is a logic configuration diagram of the cumulative flow of three shifts of natural gas cycles per day in a decentralized control system according to the present invention.
FIG. 5 shows the t-th component N in the present inventiontTotal time of single cycle of shift MtTime length of m per shifttThe logic configuration diagram of the natural gas circulation accumulated flow in the distributed control system.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 4, the method for cyclically accumulating the natural gas flow in the distributed control system according to the present invention includes the following steps:
1) natural gas instantaneous flow Q of pressure regulating station inlet measured by pressure regulating station inlet flowmeter0Then sending the data to a distributed control system;
2) natural gas flow Q measured by pressure regulating station inlet flowmeter0≤20Nm3When the natural gas flow in the inlet pipeline of the pressure regulating station is zero, the distributed control system judges that the natural gas flow in the inlet pipeline of the pressure regulating station is zero; when Q is0＞20Nm3When the flow rate is/h, the instantaneous flow rate of the natural gas in the current sampling period is Qi；
Then the instantaneous flow Q of the natural gas for one sampling periodi＝Q 036000, wherein one sampling period is 100 ms;
setting a natural gas circulation accumulation input button, an exit button and a preset input time button, and respectively finishing the functions of starting circulation accumulation, exiting circulation accumulation and clearing the accumulated flow of each section and the specific moment of starting circulation accumulation.
The initial value of the total natural gas accumulated flow is zero, and the circular accumulated exit button can initialize and clear the total natural gas accumulated flow and the accumulated flow of each section.
3) When the preset input time is reached, the cumulative natural gas flow is recorded, wherein the total cumulative flow of the kth sampling period is set to be L0Wherein, in the step (A),
Figure BDA0002738065470000041
4) dividing the total circulation accumulated flow time into a plurality of groups, wherein the total single circulation time of the t-th group is Mt(h) Dividing the total time of a single cycle into NtEach shift, wherein the time length of each shift is mt(h)，Mt＝mt×Nt；
For example, the flow is divided into groups according to year, quarter, month, day of the week, etc., and the cyclic cumulative flow calculation is performed on each shift for the t groups, for example, group 1 is the cyclic cumulative flow of three shifts per day, that is, the cyclic cumulative flow of 0 to 8 hours, the cyclic cumulative flow of 8 to 16 hours, and the cyclic cumulative flow of 16 to 24 hours.
5) Calculating the cumulative time k of the current cycle divided by MtRemainder k of x 36000t；
6) When remainder ktIn the range of 1 to 36000 x mtCumulative flow L of the 1 st shift of the t group at the k sampling time within the sampling timet1Comprises the following steps:
Figure BDA0002738065470000051
wherein z is11Initial value is 1, after one cycle period is finished, z11Automatically adding 1;
cumulative m of cyclestAfter the time length, the current value of the cumulative flow of the 1 st shift of the tth group is Mt-2mtKeeping the time length unchanged, resetting and keeping mtThe next cycle is entered after the time period.
7) Repeating the step 6), and calculating the accumulated flow of each shift of the tth group, wherein the accumulated flow of the pth shift of the tth group is LtpWhen k istAt 36000X (p-1). times.mt+1～36000×p×mtWithin the sampling time, the cumulative flow L of the pth group and the pth shift of the kth sampling timetpComprises the following steps:
Figure BDA0002738065470000052
cumulative m of cyclestAfter the time length, the current value of the cumulative flow of the pth shift of the tth group is Mt-2mtKeeping the time length unchanged, resetting and keeping mtAfter a certain period of time, enter the next cycle, i.e. ztp＝ztp+1。
8) When remainder ktAt 36000 xMt-36000×mt+1～36000×MtWithin the sampling time of (c), then the nth group of the kth sampling timetCumulative flow L of shiftt,NtComprises the following steps:
Figure BDA0002738065470000053
cumulative m of cyclestAfter a certain period of time, the nth grouptThe current value of the cumulative flow of the shift is Mt-2mtKeeping the time length unchanged, resetting and keeping mtAfter a certain period of time, enter the next cycle, i.e. zt,Nt＝zt,Nt+1。
9) And (6), 7) and 8) are repeated to obtain the circulating accumulated flow of each shift in each group, and the circulating accumulation of the natural gas flow in the distributed control system is completed.
The invention also includes: the total accumulated flow L0Current cumulative flow (L) of each shift of group 111,L12,……,L1N1) … …, current cumulative flow (L) of each shift of the t-th groupt1,Lt2,……,LtNt) And storing the current accumulated flow of each shift of the t groups in a history library, wherein the current accumulated flow of each shift of the t groups can be simplified into a matrix L:
Figure BDA0002738065470000061
referring to FIG. 5, the t-th component NtTotal time of single cycle of shift MtThe time length of each shift is mtThe configuration diagram of the natural gas circulation accumulated flow in the distributed control system, the broken line represents a switching value logic judgment loop, and the solid line represents a switching value logic judgment loopAnalog real-time data transmission loop. As can be seen from fig. 5, based on the graphical programming language of the distributed control system, the delay block TON, the and gate and, the not gate, and the switch block T are used comprehensively to implement the function of the natural gas flow cyclic accumulation, which corresponds to the T-th group of cyclic accumulation L in fig. 5tpThe specific operation is as follows:
1a) accumulating the input buttons by natural gas circulation and passing (p-1) m after the preset input time is reachedtAfter a time period of LtpBegin to accumulate from zero;
2a)Ltpto mtAfter the hours of the cycle are accumulated, M is maintainedt-mtConstant in hours, LtpZero clearing hold mtHour, accumulation resumes after the end of a cycle period.
3a) Repeating step 2a), accumulating L cyclicallytp。
4a) Start Natural gas circulation cumulative Exit button, LtpAnd stopping clearing.
The logic blocks used by the graphical program language include a delay TON, an AND gate AND, an NOT gate NOT, an OR gate OR, a pulse block, a constant block, an accumulation block SUM, AND a switching block T.
The invention overcomes the defect that the graphical program does not have compliable statements such as for, while, if and the like, which are not easy to realize circulation, and simultaneously does not bring extra cost to the system, which is also an advantage of the invention.

Claims (4)

1. A method for circularly accumulating natural gas flow in a decentralized control system is characterized by comprising the following steps:
1) natural gas instantaneous flow Q of pressure regulating station inlet measured by pressure regulating station inlet flowmeter0Then sending the data to a distributed control system;
2) the distributed control system calculates the natural gas instantaneous flow Q of a sampling periodi；
3) When the preset input time is reached, the cumulative natural gas flow is recorded, wherein the total cumulative flow of the kth sampling period is set to be L0；
4) Integrating the total circulationThe flow duration is divided into a plurality of groups, wherein the total duration of the single circulation of the tth group is Mt(h) Dividing the total time of a single cycle into NtEach shift, wherein the time length of each shift is mt(h)，Mt＝mt×Nt；
5) Calculating the cumulative time k of the current cycle divided by MtRemainder k of x 36000t；
6) When remainder ktIn the range of 1 to 36000 x mtCumulative flow L of the 1 st shift of the t group at the k sampling time within the sampling timet1Comprises the following steps:
Figure FDA0002738065460000011
7) repeating the step 6), and calculating the accumulated flow of each shift of the tth group, wherein the accumulated flow of the pth shift of the tth group is LtpWhen k istAt 36000X (p-1). times.mt+1～36000×p×mtWithin the sampling time, the cumulative flow L of the pth group and the pth shift of the kth sampling timetpComprises the following steps:
Figure FDA0002738065460000012
8) when remainder ktAt 36000 xMt-36000×mt+1～36000×MtWithin the sampling time of (c), then the nth group of the kth sampling timetCumulative flow L of shiftt,NtComprises the following steps:
Figure FDA0002738065460000013
9) and (6), 7) and 8) are repeated to obtain the circulating accumulated flow of each shift in each group, and the circulating accumulation of the natural gas flow in the distributed control system is completed.
2. Natural gas flow circulation in a decentralized control system according to claim 1The method of accumulation, characterized by, further comprising: the total accumulated flow L0Current cumulative flow (L) of each shift of group 111,L12,……,L1N1) … …, current cumulative flow (L) of each shift of the t-th groupt1,Lt2,……,LtNt) Stored in a history repository.
3. Method for cyclic integration of natural gas flows in decentralized control system according to claim 1, characterized in that the instantaneous flow Q of natural gas is measured for one sampling periodiComprises the following steps:
Figure FDA0002738065460000021
wherein the sampling period is 100 ms;
when Q is0≤20Nm3When the sampling time is/h, the natural gas instantaneous flow at the current sampling time is zero, and when the sampling time is Q0＞20Nm3At the hour of/h, the instantaneous flow of the natural gas at the current sampling moment is Qi。
4. Method for cyclic integration of natural gas flows in a decentralized control system according to claim 1, characterized in that the total integrated flow L for the kth sampling period0Comprises the following steps:
Figure FDA0002738065460000022
CN202011140306.9A 2020-10-22 2020-10-22 Method for circularly accumulating natural gas flow in distributed control system Active CN112304380B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011140306.9A CN112304380B (en) 2020-10-22 2020-10-22 Method for circularly accumulating natural gas flow in distributed control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011140306.9A CN112304380B (en) 2020-10-22 2020-10-22 Method for circularly accumulating natural gas flow in distributed control system

Publications (2)

Publication Number Publication Date
CN112304380A true CN112304380A (en) 2021-02-02
CN112304380B CN112304380B (en) 2024-01-19

Family

ID=74327110

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011140306.9A Active CN112304380B (en) 2020-10-22 2020-10-22 Method for circularly accumulating natural gas flow in distributed control system

Country Status (1)

Country Link
CN (1) CN112304380B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11281413A (en) * 1998-03-31 1999-10-15 Yazaki Corp Flow rate measuring method and device, and electronic gas meter
JP2003270009A (en) * 2002-03-15 2003-09-25 Matsushita Electric Ind Co Ltd Method for measuring and displaying flow rate and flowmeter using the same
JP2004354398A (en) * 2004-09-17 2004-12-16 Matsushita Electric Ind Co Ltd Flowmeter
CN104748810A (en) * 2015-03-16 2015-07-01 江苏永钢集团有限公司 Fluid flow accumulating system
CN105973321A (en) * 2015-07-07 2016-09-28 成都国光电子仪表有限责任公司 Microcomputer metering system for natural gas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11281413A (en) * 1998-03-31 1999-10-15 Yazaki Corp Flow rate measuring method and device, and electronic gas meter
JP2003270009A (en) * 2002-03-15 2003-09-25 Matsushita Electric Ind Co Ltd Method for measuring and displaying flow rate and flowmeter using the same
JP2004354398A (en) * 2004-09-17 2004-12-16 Matsushita Electric Ind Co Ltd Flowmeter
CN104748810A (en) * 2015-03-16 2015-07-01 江苏永钢集团有限公司 Fluid flow accumulating system
CN105973321A (en) * 2015-07-07 2016-09-28 成都国光电子仪表有限责任公司 Microcomputer metering system for natural gas

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
单珊;梁伟;: "流量累积计算在PLC系统中的实现", 中国管理信息化, no. 11 *
尹燕波;: "累计取样器在海上天然气贸易计量中的应用及改进", 化工管理, no. 07 *
杨帆;余立建;: "天然气门站计量控制系统的设计与实现", 工业控制计算机, no. 05 *
程小欢;黄振宇;: "DCS中累积流量逻辑的误差分析和对策", 中国计量, no. 04 *

Also Published As

Publication number Publication date
CN112304380B (en) 2024-01-19

Similar Documents

Publication Publication Date Title
CN101498554B (en) Serial automatic coal injection control system and method for blast furnace
CN106355274A (en) Auxiliary system for flood defense dispatching decision
CN106444649A (en) Semiconductor production line closed-loop scheduling control method
CN201476905U (en) Neural network PID temperature controlled thermocouple automatic verification system
CN110134040B (en) Method and system for processing operation data of industrial equipment
CN112304380A (en) Method for circularly accumulating natural gas flow in distributed control system
CN110298554A (en) The system and method for roughness calibration in river surface profile calculating
CN107221933A (en) A kind of probability load flow calculation method
CN108767855B (en) Random production simulation method for time sequence continuous hybrid power system
CN109817360A (en) Predict the prediction technique of nuclear heat power deviation and RPN system Gk parameter tendency
CN103801564B (en) Coil data tracking method for cold rolled continuous annealing pickling line
CN207038185U (en) Pressurized-water reactor nuclear power plant core power control device based on Takagi Sugeno fuzzy controls
CN111738493B (en) Power grid safety risk pre-control decision method and device for new energy power generation uncertainty
CN113255982A (en) Medium-long term optimized scheduling method for wind-light-water complementary system
CN116228175B (en) Real-time management system based on enterprise-level engineering construction cost
CN109260948B (en) Denitration uniformity measurement optimization system and method under fluctuating load
CN113642256B (en) Practical gate opening and closing optimization method based on theme database
CN109617131A (en) A kind of electric system production cost measuring method and system
CN108982308B (en) Real-time multi-task scheduling method based on DSP fly ash carbon content measurement
CN113807667B (en) Reservoir flood control forecast optimal scheduling method for downstream flood control points
CN103207563B (en) Event trace, reduction and feedback-based method for controlling production process
CN101109099A (en) Control method based on industry ethernet plating production process
CA1201515A (en) Program timer control
CN109533207B (en) Automatic adjusting method for pre-tension of mooring cable in pool model test
CN112107977A (en) Automatic pH value adjusting method, system and device based on desulfurization system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant