CN203384078U - Multistage centrifugal compressor constant pressure control device based on programmable logic controller (PLC) - Google Patents
Multistage centrifugal compressor constant pressure control device based on programmable logic controller (PLC) Download PDFInfo
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- CN203384078U CN203384078U CN201320395532.0U CN201320395532U CN203384078U CN 203384078 U CN203384078 U CN 203384078U CN 201320395532 U CN201320395532 U CN 201320395532U CN 203384078 U CN203384078 U CN 203384078U
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Abstract
The utility model discloses a multistage centrifugal compressor constant pressure control device based on a programmable logic controller (PLC). The multistage centrifugal compressor constant pressure control device based on the PLC comprises a PLC, wherein the PLC is respectively connected with a touch display screen, a first artificial intelligence (AI) module, a second AI module, a data input (DI) module, a defense order (DO) module and an analog output (AO) module through signal wires, the first AI module is connected with a vibration meter, an inlet-outlet water temperature sensor and a motor current meter, the second AI module is connected with an inlet-outlet pressure sensor, a lubricating oil pressure sensor and a lubricating oil temperature sensor, the DI module is connected with a filter pressure difference switch, an oil pump overload controller, a compressor outlet valve feedback, a main motor soft starting control cabinet and a scram button, the DO module is connected with a compressor outlet valve, a lubricating oil system and an outlet guide vane controller, and the AO module is connected with a compressor outlet vent adjusting valve and a guide vane rotating speed adjustor. The multistage centrifugal compressor constant pressure control device based on the PLC achieves constant pressure control of a multistage centrifugal compressor system, guarantees energy-saving operation of big power compression unit, and also can greatly reduce up-front investment.
Description
Technical field
The utility model relates to a kind of compressor control device, particularly a kind of multistage centrifugal compressor constant-pressure control device based on PLC.
Background technique
Multistage centrifugal compressor has that volume is little, flow is large, lightweight, operational efficiency is high, few easy workout part, conveying gas without oil vapour pollution, air feed evenly, the series of advantages such as smooth running, good economy performance.Therefore be widely used in a plurality of industries such as iron and steel, chemical industry, electric power, shipbuilding, what in West-East National Gas Transmission Project, select completely is centrifugal compressor.
Multistage compressor is intended to export a constant source of the gas, so constant voltage output is the emphasis that unit is controlled.In the situation that user's gas consumption load constantly changes and can guarantee the operation that the compressor all-the-time stable is energy-conservation.
Current original multistage compressor control system control mode frequency control of motor speed or outlet regulating valve opening are controlled delivery pressure, and the surge judgment mechanism, for pressure switch detects negative pressure.For frequency conversion voltage adjusting, its advantage be energy-conservation and also the constant performance of delivery pressure good, shortcoming is that cost is high, and powerful unit can not be ignored for the harmonic effects of electrical network.For the advantage that realizes constant voltage output by the outlet regulating valve, be that cost is low, shortcoming is that energy loss is large, and the Output pressure fluctuation is large.Surge detects by single pressure switch, and stability is inadequate.Easily produce wrong report and misrepresent deliberately, once and the wrong report unit will shut down, easily quantity-produced industrial enterprise are produced to considerable influence.
Summary of the invention
Technical problem to be solved in the utility model is for the deficiencies in the prior art, provide a kind of reasonable in design, realized the constant voltage of multistage centrifugal compressor system is controlled, both guaranteed the multistage centrifugal compressor constant-pressure control device based on PLC of the energy-saving run of high-power compressor group.
Technical problem to be solved in the utility model is to realize by following technological scheme.The utility model is a kind of multistage centrifugal compressor constant-pressure control device based on PLC, be characterized in, this control gear comprises PLC, and PLC is connected with the AO module with touch screen display, an AI module, the 2nd AI module, DI module, DO module by signaling line respectively;
The entering water temp sensor that install at the water-exit temperature sensor that the one AI module is installed with the coolant outlet place of the vibrations instrument of installing on the compressor gear-box, cooler by signaling line respectively, the cooling water intake place of cooler, the motor current table of compressor are connected;
The inlet pressure sensor that the outlet pressure sensor that the 2nd AI module is installed with the compressor outlet place by signaling line respectively, compressor inlet are installed, the lubricant pressure sensor of gear-box, the lubricating oil temperature sensor of gear-box are connected;
The DI module is connected with filtration pressure difference switch, the oil pump overload controller of lubrication system, compressor outlet valve feedback, main motor soft control cabinet, emergency stop button of lubrication system by signaling line respectively;
The DO module is connected with the lubricating oil system of compressor outlet valve, gear-box, the exit guide blade controller of compressor by signaling line respectively;
The AO module is connected with compressor outlet emptying modulating valve, stator rotating speed speed regulator by signaling line respectively.
In multistage centrifugal compressor constant-pressure control device based on PLC described in the utility model: the control software of described PLC adopts module design, takes Open-closed-loop to combine and fuzzy PID control method.
In multistage centrifugal compressor constant-pressure control device based on PLC described in the utility model: PLC is upper can also be provided with communication port and carry out communication with outer computer and be connected.
The control object of the utility model multistage centrifugal compressor constant-pressure control device is for comprising compressor, gear-box, motor, cooler, lubricating oil system, air inlet system and exhaust system.The utility model device can adapt to the broader operating range of air compressor of different capacity, and its control is flexible, matching is strong, under any operating mode, can guarantee the air pressure that compressor outlet is desirable, reaches air pressure, temperature, efficiency optimum Match.The core component of this control gear is ECU (Electrical Control Unit), by I/O equipment, testing signal is comprised to the signals such as inlet and outlet pressure, temperature, bear vibration, inlet oil temperature pressure deliver to the CPU computing, calculate the operation curve of current unit by return parameters, jointly control the stable operation of the constant and unit that guarantees outlet pressure by stator and outlet valve, take into account the operational efficiency of unit simultaneously.Adjust mouth pressure in the efficient operation area of unit by controlling stator, at limit area, by regulating valve, control outlet pressure.
Control software and adopt module design, take Open-closed-loop to combine and the control strategy such as fuzzy.For ease of test adjustment, ECU (Electrical Control Unit) also leaves communication port and outer computer carries out communication, can or send data to computer by the computer installation control command, so that data storage, processing and analysis.
The utility model device selects domestic programmable control module PLC to control, its level of integration is high, reliable in quality, advanced technology, expansion convenient, MODBUS and network communication interface are provided, can be connected with computer, touch screen and other industry control smart machine easily, complete to the measurement of the signals such as gas temperature, pressure, flow with to the control task of the manufacturing mechanisms such as modulating valve, actuating motor, electric oil pump by touch screen.PLC contacts by industrial field bus and main control station, completes whole control procedure.Wherein, each to control implementation as follows:
(1) stator, modulating valve are in conjunction with accurately controlling
Utilize fuzzy control, by site test, draw project data, draw correlation formula and control algorithm.It is input parameter that system adopts compressor air pressure feedback parameter, in order to characterize the working state of compressor; Take guide vane opening as controlled variable, and compressor delivery pressure is controlled variable, according to the operation curve of unit, selects control object.Realize the stable of unit delivery pressure in the efficient operation area of unit by regulating stator.By regulating valve, realize pressure controlled purpose at the unit operation limit area.
(2) multiple constant voltage mode is controlled
Unit is provided with multiple constant voltage control mode, specifically has three kinds: 1, full constant voltage; 2, part constant voltage; 3, constant voltage+unloading.Full constant voltage mode refers to that the Output pressure adjusting realizes that minimum air demand outputs to the linear constant pressure adjust of 100% output, and this mode can realize the enterprise had relatively high expectations for the Output pressure constancy.Refer to that for constant voltage+unloading difference overregulates the valve throttling and carry out pressure regulation, air demand is less than stator while controlling minimum air demand, opens antiaircraft valve and unloads, and it is not very high that this mode is adapted to that constant voltage requires, and wishes to realize preferably energy-conservation enterprise simultaneously.Be the intermediateness of two kinds of modes of money for part constant voltage mode, when the unit air demand is less than stator and controls minimum air demand, by regulating valve, realize constant pressure, when aperture reaches certain setting value unloading pressure after a period of time.
(3) reliably automatic Anti-surge Control
Whether comprhensive deterministic system is in surging condition in several ways.At first calculate the pumping point of current system by delivery pressure, current of electric, the out temperature of system, control stator and the outlet valve of unit and avoid entering surge region.The second way is to judge whether to enter surge region by the Pressure testing negative pressure value.The third mode is to detect by vibration values, and vibration values surpasses setting value and thinks that it enters surge area, the compressor emergency shutdown protection.
The control program design of the utility model device can adopt the large proud NApro of company that opens up in south, Nanjing as developing instrument, use modular design, mainly by following several function blocks, formed: system initialization module, signals collecting, puocessing module, system control module, information receives, transmitting module, alarm information processing module etc.Operation interface can adopt the TK6102i V2 series touch screen of selecting Taiwan prestige human relations as man-machine interface, the machine carries the MODBUS interface, can directly with the serial ports of NA400 series of PLC, be connected, the bias light mean lifetime can reach 30000 hours, resolution 800*480, meet the designing requirement at system on human machine interface.
In the utility model device, the control of inlet guide vanes device can select direct current generator to drive, and adopts speed Control, has not only guaranteed the speed of response of stator but also can guarantee control accuracy.This systematic comparison servo-system speed of response is suitable with precision, but cost declines to a great extent.Make systematic function superior, feature richness, improved the simplicity of using, and realizes higher benefit.
Compared with prior art, advantage of the present utility model and technique effect are as follows:
(1) the utility model has been realized the constant voltage of multistage centrifugal compressor system is controlled, and has both guaranteed the energy-saving run of high-power compressor group, can significantly reduce again in advance and drop into.Under the overall situation of energy-saving and emission-reduction, be expected to be applied on a large scale.
(2) the utility model can be realized the smooth running of multiple service condition, complex working condition lower compression unit.For the situation that jeopardizes unit operation safety, take timely and effectively counter-measure.
(3) adopt multiple surge judgment mechanism, by the parameter variations such as detected pressures, vibrations, temperature surging phenomenon is judged in advance, realize accurately, in time, effectively avoiding the dangerous generation of surge.
The accompanying drawing explanation
Fig. 1 is a kind of control block diagram of the present utility model.
Embodiment
Referring to accompanying drawing, further describe concrete technological scheme of the present utility model, so that those skilled in the art understands the utility model further, and do not form the restriction to its right.
Embodiment 1, a kind of multistage centrifugal compressor constant-pressure control device based on PLC, and this control gear comprises PLC, PLC is connected with the AO module with touch screen display, an AI module, the 2nd AI module, DI module, DO module by signaling line respectively;
The entering water temp sensor that install at the water-exit temperature sensor that the one AI module is installed with the coolant outlet place of the vibrations instrument of installing on the compressor gear-box, cooler by signaling line respectively, the cooling water intake place of cooler, the motor current table of compressor are connected;
The inlet pressure sensor that the outlet pressure sensor that the 2nd AI module is installed with the compressor outlet place by signaling line respectively, compressor inlet are installed, the lubricant pressure sensor of gear-box, the lubricating oil temperature sensor of gear-box are connected;
The DI module is connected with filtration pressure difference switch, the oil pump overload controller of lubrication system, compressor outlet valve feedback, main motor soft control cabinet, emergency stop button of lubrication system by signaling line respectively;
The DO module is connected with the lubricating oil system of compressor outlet valve, gear-box, the exit guide blade controller of compressor by signaling line respectively;
The AO module is connected with compressor outlet emptying modulating valve, stator rotating speed speed regulator by signaling line respectively.
Embodiment 2, in the described multistage centrifugal compressor constant-pressure control device based on PLC of embodiment 1: also be provided with communication port on PLC and carry out communication with outer computer and be connected.
Claims (2)
1. the multistage centrifugal compressor constant-pressure control device based on PLC, is characterized in that, this control gear comprises PLC, and PLC is connected with the AO module with touch screen display, an AI module, the 2nd AI module, DI module, DO module by signaling line respectively;
The entering water temp sensor that install at the water-exit temperature sensor that the one AI module is installed with the coolant outlet place of the vibrations instrument of installing on the compressor gear-box, cooler by signaling line respectively, the cooling water intake place of cooler, the motor current table of compressor are connected;
The inlet pressure sensor that the outlet pressure sensor that the 2nd AI module is installed with the compressor outlet place by signaling line respectively, compressor inlet are installed, the lubricant pressure sensor of gear-box, the lubricating oil temperature sensor of gear-box are connected;
The DI module is connected with filtration pressure difference switch, the oil pump overload controller of lubrication system, compressor outlet valve feedback, main motor soft control cabinet, emergency stop button of lubrication system by signaling line respectively;
The DO module is connected with the lubricating oil system of compressor outlet valve, gear-box, the exit guide blade controller of compressor by signaling line respectively;
The AO module is connected with compressor outlet emptying modulating valve, stator rotating speed speed regulator by signaling line respectively.
2. the multistage centrifugal compressor constant-pressure control device based on PLC according to claim 1, is characterized in that, also is provided with communication port on PLC and carries out communication with outer computer and be connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320395532.0U CN203384078U (en) | 2013-07-04 | 2013-07-04 | Multistage centrifugal compressor constant pressure control device based on programmable logic controller (PLC) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320395532.0U CN203384078U (en) | 2013-07-04 | 2013-07-04 | Multistage centrifugal compressor constant pressure control device based on programmable logic controller (PLC) |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343748A (en) * | 2013-07-04 | 2013-10-09 | 连云港杰瑞网络有限公司 | Multi-stage centrifugal compressor constant pressure control device based on PLC |
| CN105381890A (en) * | 2015-11-27 | 2016-03-09 | 重庆美的通用制冷设备有限公司 | Load adjustment method and device of centrifugal machine unit |
| CN109578296A (en) * | 2017-09-29 | 2019-04-05 | 中国石油化工股份有限公司 | A kind of method of constant rotational speed centrifugal compressor automatic energy saving control |
-
2013
- 2013-07-04 CN CN201320395532.0U patent/CN203384078U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343748A (en) * | 2013-07-04 | 2013-10-09 | 连云港杰瑞网络有限公司 | Multi-stage centrifugal compressor constant pressure control device based on PLC |
| CN105381890A (en) * | 2015-11-27 | 2016-03-09 | 重庆美的通用制冷设备有限公司 | Load adjustment method and device of centrifugal machine unit |
| CN105381890B (en) * | 2015-11-27 | 2018-10-16 | 重庆美的通用制冷设备有限公司 | The load adjusting method and device of centrifuge unit |
| CN109578296A (en) * | 2017-09-29 | 2019-04-05 | 中国石油化工股份有限公司 | A kind of method of constant rotational speed centrifugal compressor automatic energy saving control |
| CN109578296B (en) * | 2017-09-29 | 2021-02-05 | 中国石油化工股份有限公司 | Automatic energy-saving control method for constant-rotating-speed centrifugal compressor |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140108 Termination date: 20170704 |
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| CF01 | Termination of patent right due to non-payment of annual fee |