CN102541034B - Biogas power generation control system - Google Patents
Biogas power generation control system Download PDFInfo
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- CN102541034B CN102541034B CN201210032066.XA CN201210032066A CN102541034B CN 102541034 B CN102541034 B CN 102541034B CN 201210032066 A CN201210032066 A CN 201210032066A CN 102541034 B CN102541034 B CN 102541034B
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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
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Abstract
The invention discloses a biogas power generation control system, which comprises a double redundant upper computer (1), a network exchanger (2), a double redundant programmable logic controller (PLC) station (3) and a device-level control unit (4), wherein the upper computer (1) is connected with the network exchanger (2); and the network exchanger (2) communicates with the PLC station (3) through an industrial Ethernet. By the biogas power generation control system, on-site devices of a large-scale biogas power generation system share data and are subjected to centralized management and decentralized control, and the expandability and maintainability of the system can be enhanced.
Description
Technical field
the present invention relates to a kind of marsh gas power generation automation control system based on PLC, belong to marsh gas power generation control field.
Background technology
biogas combustion generating is the biogas utilization technology occurring along with the development of large methane tank construction and biogas comprehensive utilization, and it is processed by anaerobic fermentation the biogas producing and is used for engine, and composite generating set is housed, to produce electric energy and heat energy.Marsh gas power generation has the features such as wound effect, energy-conservation, safety and environmental protection, is a kind of widely distributed and inexpensive distributed energy.
therefore, the equipment that relates in methane power generating system is numerous and disperse, for the ease of monitoring and the maintenance of management data and equipment, need a kind of extensive automatic control system that can be to the data sharing of each field apparatus of methane power generating system, centralized management, decentralised control.
Summary of the invention
the object of the invention is to, a kind of biogas power generation control system is provided, can realize data sharing, centralized management, the decentralised control of extensive each field apparatus of methane power generating system.And can strengthen extendability and the maintainability of system.
for solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of biogas power generation control system, comprise: the PLC control station of the host computer of two redundant configuration, the network switch, two redundant configuration and device level control module, host computer is connected with the network switch, between the network switch and PLC control station, by Industrial Ethernet, carries out communication.
in aforesaid a kind of biogas power generation control system, PLC control station adopts S7-400 series of PLC controller.
in aforesaid a kind of biogas power generation control system, device level control module comprises flare system control module, combustion machine control module and natural pond processed control module, and flare system control module, combustion machine control module and natural pond processed control module all carry out communication by Profibus-DP bus protocol and PLC control station.
in aforesaid a kind of biogas power generation control system, device level control module comprises twin-screw engine control module, waste heat boiler control module and SCADA system, and twin-screw engine control module, waste heat boiler control module and SCADA system are all carried out communication by the RS-485 bus based on modbus agreement and PLC control station.
in aforesaid a kind of biogas power generation control system, device level control module also comprises between voltage regulating station control module and PLC control station and being connected by cable laying.
in aforesaid a kind of biogas power generation control system, also be provided with auxiliary monitoring system, auxiliary monitoring system comprises methane concentration pick-up unit, cctv surveillance device and the methane leakage warning device that adopts infrared analysis formula, and the auxiliary monitoring system of distance adopts remote I/O mode and PLC control station to carry out communication wherein and between PLC control station.
in aforesaid a kind of biogas power generation control system, also comprise the remote computer being connected with the network switch, for methane power generating system is carried out to remote monitoring.
in aforesaid a kind of biogas power generation control system, host computer, remote computer all adopt WINCC7.0 configuration instrument, its picture window shows process chart, technological parameter, electric parameter and equipment running status, Unit Commitment, normally can be automatically under operation or unusual service condition to each relevant parameters scan, data processing and regularly tabulation.
in aforesaid a kind of biogas power generation control system, host computer, remote computer all comprise operator station and engineer station.
in aforesaid a kind of biogas power generation control system, PLC control station adopts STEP7 programming tool, and takes the programmed method of " structure variable+picture window+functional block ".
compared with prior art, the present invention adopts the technical scheme of central control system+complete control system+auxiliary monitoring system, be applicable to the methane power generating system of marsh gas power generation amount more than 1000kw, there is the marsh gas power generation automation control system of versatility, opening.Central control system, major control object comprises: therrmodynamic system control module and water conservancy project control module, be responsible for the integration of whole audience control system, by complete control system of each minute whole one-tenth of control system of the whole audience, realize and control sharing of data; Adopt host computer and the PLC control station of two redundant configuration, be applicable to marsh gas power generation field feature, the signal cable that enters PLC controller adopts computer shielded cable, the I/O of PLC system adopts photoelectricity quarantine measures or other quarantine measures, stability, reliability and the security of marsh gas power generation operational process have greatly been improved, adopt the S7-400 series of PLC of technology maturation, there is high-performance, high reliability and more functional block combination.The supporting PLC control system providing with technique producer is provided complete control system, possess relatively complete control function, its main complete control system is as follows: natural pond processed control module, voltage regulating station control module, combustion machine control module and twin-screw engine control module; Auxiliary monitoring system comprises closed-circuit TV monitoring system, methane Density Monitoring System and methane leakage warning device.The topworks of native system selects electromechanical integrated product, and itself is with servoamplifier; Electrically operated valve is selected integrated electric head, has not only saved electrically operated valve control enclosure, reduces buying expenses, cable and erected cost, also makes site layout project succinct, neat, attractive in appearance.In addition, remote computer is also set metallurgical electricity generation system is carried out to Long-distance Control, this has just realized data sharing, centralized management and decentralised control to marsh gas power generation, system management, maintainer are subtracted to be a half, save personnel's spending, realized and improved the automatization level of whole control system.
host computer adopts WINCC7.0 configuration instrument, and slave computer adopts STEP7 programming tool.Particular craft based on marsh gas power generation, taked the programmed method of " structure variable+picture window+functional block ", for example valve is controlled, valve comprises open and close, opens state, off status and five kinds of situations of fault, in programming, set up control function FB1, functional block DB1(for valve one), in WINCC7.0 configuration instrument, set up the structure variable C1 corresponding with DB1, so the function that the valve one of picture window calls is FB1(DB1); If the valve in the process chart that increase picture window shows, only need set up the structure variable of respective valves, corresponding function piece, call again the function of corresponding function piece, do not need again to write function, save programming time, be also easy to five of valve kinds of situations to control, greatly strengthened extendability and the maintainability of system.Therefore, can carry out easily expansion and the adjustment of function, be easy to develop the control software of similar biogas project.
Accompanying drawing explanation
fig. 1 is the structural representation of the embodiment of the present invention;
fig. 2 is the marsh gas power generation process schematic representation of the embodiment of the present invention.
reference numeral is: 1-host computer, the 2-network switch, 3-PLC control station, 4-device level control module, 5-flare system control module, 6-combustion machine control module, 7-natural pond processed control module, 8-twin-screw engine control module, 9-waste heat boiler control module, 10-SCADA system, 11-voltage regulating station control module, 12-remote computer.
below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Embodiment
embodiments of the invention draw according to distinctive marsh gas power generation technique, the schematic flow sheet of this technique as shown in Figure 2, be specially: the biogas that natural pond processed system produces generates electricity through biogas internal combustion engine, smoke evacuation after generating enters waste heat boiler, carry out heat exchange with water, flue-gas temperature reduces, and the flue gas after cooling is discharged by chimney; Saturated the trying to make a good showing producing after water heat absorption enters the acting of expanding of twin-screw expansion motive power machine and generator and generates electricity, and steam discharge enters condenser, and condensed water enters waste heat boiler and recycles; Recirculated cooling water in condenser absorbs the steam discharge temperature after liberated heat of condensing and raises, and a part of recirculated water enters the fermentation tank of natural pond processed system, and for fermentation tank provides heat, it is cooling that another part recirculated water enters cooling tower; Recirculated water after fermentation tank release heat and converging from cooling tower chilled water out, enters condenser and recycles as recirculated cooling water.
be applicable to a kind of biogas power generation control system of above-mentioned marsh gas power generation technique, as shown in Figure 1, comprise: the PLC control station 3 of the host computer 1 of two redundant configuration, the network switch 2, two redundant configuration and device level control module 4, host computer 1 is connected with the network switch 2, between the network switch 2 and PLC control station 3, by Industrial Ethernet, carries out communication.
pLC control station 3 adopts S7-400 series of PLC controller.
device level control module 4 comprises flare system control module 5, combustion machine control module 6 and natural pond processed control module 7, and flare system control module 5, combustion machine control module 6 and natural pond processed control module 7 all carry out communication by Profibus-DP bus protocol and PLC control station 3.Biogas flow detector in natural pond processed control module 7 adopts Cone Flowmeter, is also provided with supporting methane concentration monitoring device.
the PLC supervisory system that combustion machine carries possesses following function:
(1) in the situation that automatically controlling, guarantee unit can be under the operating mode of 50%～100% rated load continuous and steady operation;
(2) guarantee that unit can move under default constant duty mode, can under automatic frequency control system, move again;
(3) unit can Fast starting and is accelerated to rated speed;
(4) unit can automatic synchronization and is automatically increased or decreased load.
device level control module 4 comprises twin-screw engine control module 8, waste heat boiler control module 9 and SCADA system 10, and twin-screw engine control module 8, waste heat boiler control module 9 and SCADA system 10 are all carried out communication by the RS-485 bus based on modbus agreement and PLC control station 3.
twin-screw expansion motive power machine model SEPG250-100-4000-1.65-C in twin-screw engine control module 8, the supporting PLC switch board of twin-screw expansion motive power machine, be used for the control of combustion machine body, the PLC control station 3 of central control system adopts communication modes and switch board to carry out data transmission, for important control signal, adopt hard wired mode to carry out data transmission.
1 pair 1 layout of waste heat boiler and biogas internal combustion engine, waste heat boiler is provided with bypass flue, and flue arranges the switching that Hand-operated butterfly valve is controlled flowing of flue gas and by-pass flue.Boiler is horizontal, saturated vapour, Natural Circulation flue gas type waste heat boiler, indoor layout.Waste heat boiler is that PLC control station 3 is controlled by central control system.
device level control module 4 also comprises voltage regulating station control module 11, and by cable laying, is connected between PLC control station 3.Voltage regulating station control module is with supporting the providing of complete supply of material producer of voltage regulating station, and its switch board adopts communication modes and central control system to carry out data transmission, for important control signal, adopts hardwire to carry out data transmission.
described system is also provided with auxiliary monitoring system, auxiliary monitoring system comprises methane concentration pick-up unit, cctv surveillance device and the methane leakage warning device that adopts infrared analysis formula, and the auxiliary monitoring system of distance adopts remote I/O mode and PLC control station 3 to carry out communication wherein and between PLC control station 3.Methane concentration monitoring device provides with natural pond processed system support, and methane leakage warning device is arranged on compressor plant, combustion machine room; Cctv surveillance device, between finished product natural pond slag week stock relocation, Separation of Solid and Liquid workshop, homogenate pond, fermentation tank, voltage regulating station, generator car, gate and enclosure wall arrange number monitoring probe not etc., for above-mentioned place field apparatus is carried out to picture control, and the image information of collection is sent in the host computer 1 of central control room.
described system also comprises the remote computer 12 being connected with the network switch 2, for methane power generating system is carried out to remote monitoring.
host computer 1, remote computer 12 all adopt WINCC7.0 configuration instrument, its picture window shows process chart, technological parameter, electric parameter and equipment running status, Unit Commitment, normally can be automatically under operation or unusual service condition to each relevant parameters scan, data processing and regularly tabulation.
host computer 1, remote computer 12 all comprise operator station and engineer station.Host computer 1 is located in central control room, and the indoor printer that is also provided with of center-control, for carrying out timing, warning and random printing by user-defined statement form.
pLC control station 3 adopts STEP7 programming tool, and takes the programmed method of " structure variable+picture window+functional block ".
principle of work: device level control module 4 gathers relevant measuring point signal and equipment state signal, the on-site signal that the PLC control station 3 receiving equipment level control modules 4 gather (technological parameter of methane power generating system process for example, electrical parameter and equipment running status) and process, through the network switch, send host computer 1 and remote computer 12 to, host computer 1 and remote computer 12 provide complete demonstration by WINCC7.0 configuration instrument, report to the police, record and Operating Guideline, to slave computer, be each device level control module 4 output signals, each field apparatus is carried out to corresponding control.
wherein, control subsystem comprises:
1, data acquisition system (DAS) (DAS), the main supervision means of unit safety operation, there is high reliability and real-time response ability, can continuous acquisition and process all measuring point signals relevant with unit and equipment state signal, and its input signal is processed, to operation people, provide complete demonstration, warning, record and Operating Guideline, and form complete harmonious management and a control center with control system and other Instrumentation and Control equipment.The major function of data acquisition system (DAS) has:
(1) system condition demonstration comprises: single-point demonstration, demonstration in groups, flow sheet demonstration, the demonstration of function group, alarm indication, dependent picture demonstration, trend demonstration, start and stop picture disply, Operating Guideline show, system state shows;
(2) system condition is printed tabulation and is comprised: accident recollect printing, accident are sequentially printed, event printing, print-on-alarm, group printing, regularly tabulation;
(3) historical data storage and retrieval.
2, analog quantity system (MCS), will adopt three-element feedwater control system, by automatic change boiler loading, to maintain steam water-level, by maintaining stable state quality of steam stream and balance of feed water, maintain steam water-level.In addition, drum pressure is used for measuring steam water-level as a compensation factor and controls to improve response, to eliminate because combustion rate changes, evaporate to dryness occurs and water level is crossed high phenomenon.
3, sequence control system (SCS), sequential control be take subfunction group as main, according to the service requirement of combustion machine, waste heat boiler, auxiliary device and process system, forms the subfunction group of different sequence control systems.Operations staff can, according to the start and stop of subfunction group, also can grasp at the independent hand of LCD/KB each controlled device, and have the operation permissive condition of different levels, to copy maloperation.
Claims (6)
1. a biogas power generation control system, it is characterized in that, comprise: the PLC control station (3) of the host computer of two redundant configuration (1), the network switch (2), two redundant configuration and device level control module (4), host computer (1) is connected with the network switch (2), between the network switch (2) and PLC control station (3), by Industrial Ethernet, carries out communication;
PLC control station (3) adopts Siemens S7-400 series of PLC controller;
Host computer (1), remote computer (12) all adopt WINCC7.0 configuration instrument, its picture window shows process chart, technological parameter, electric parameter and equipment running status, Unit Commitment, normally can be automatically under operation or unusual service condition to each relevant parameters scan, data processing and regularly tabulation;
PLC control station (3) adopts STEP7 programming tool;
For valve, control, valve comprises open and close, opens state, off status and five kinds of situations of fault, in programming, for valve one, set up control function FB1, functional block DB1, in WINCC7.0 configuration instrument, set up the structure variable C1 corresponding with DB1, so the function that the valve one of picture window calls is FB1(DB1); If increase the valve in the process chart that picture window shows, only need set up the structure variable of respective valves, corresponding function piece, then call the function of corresponding function piece, do not need again to write function.
2. a kind of biogas power generation control system according to claim 1, it is characterized in that: device level control module (4) comprises flare system control module (5), combustion machine control module (6) and natural pond processed control module (7), flare system control module (5), fire machine control module (6) and natural pond processed control module (7) all passes through Profibus-DP bus protocol and PLC control station (3) carries out communication.
3. a kind of biogas power generation control system according to claim 1 and 2, it is characterized in that: device level control module (4) also comprises twin-screw engine control module (8), waste heat boiler control module (9) and SCADA system (10), RS-485 bus and PLC control station (3) that twin-screw engine control module (8), waste heat boiler control module (9) and SCADA system (10) are all passed through based on modbus agreement carry out communication.
4. a kind of biogas power generation control system according to claim 1 and 2, it is characterized in that: device level control module (4) also comprises voltage regulating station control module (11), between voltage regulating station control module (11) and PLC control station (3), by cable laying, be connected.
5. a kind of biogas power generation control system according to claim 1, it is characterized in that: be also provided with auxiliary monitoring system, auxiliary monitoring system comprises methane concentration pick-up unit, cctv surveillance device and the methane leakage warning device that adopts infrared analysis formula, and the auxiliary monitoring system of distance adopts remote I/O mode and PLC control station (3) to carry out communication wherein and between PLC control station (3).
6. a kind of biogas power generation control system according to claim 1, is characterized in that: also comprise the remote computer (12) being connected with the network switch (2), for methane power generating system is carried out to remote monitoring.
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| CN102872689B (en) * | 2012-08-20 | 2014-07-09 | 中国计量学院 | Infrared differential spectroscopy-based biogas detection and purification control system |
| CN104076746A (en) * | 2013-03-25 | 2014-10-01 | 山西太钢不锈钢股份有限公司 | Unattended region equipment control method |
| CN103558825A (en) * | 2013-11-07 | 2014-02-05 | 镇江赛尔尼柯自动化有限公司 | Distributed computing quick response real-time control system |
| CN103994464B (en) * | 2014-05-14 | 2016-12-07 | 山西亚乐士环保技术股份有限公司 | A kind of industry torch remote fault diagnosis and the system of maintenance |
| CN105756735A (en) * | 2016-04-08 | 2016-07-13 | 苏州玄禾物联网科技有限公司 | Remote monitoring system for screw expander generating set |
| CN109507948A (en) * | 2018-12-13 | 2019-03-22 | 湖南普信工程技术有限公司 | A kind of environment-friendly engineering monitoring system based on PLC system |
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Address after: 100035, B, building 5, Huadian building, No. 273 Xizhimen Main Street, Beijing, Xicheng District Patentee after: CHINA HUADIAN ENGINEERING CO., LTD. Address before: 100035, B, building 5, Huadian building, No. 273 Xizhimen Main Street, Beijing, Xicheng District Patentee before: China Huadian Engineering (Group) Co., Ltd. |