CN101749727A - High-cost performance system for controlling combustion redundancy of coal-fired heat transfer material heater - Google Patents
High-cost performance system for controlling combustion redundancy of coal-fired heat transfer material heater Download PDFInfo
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Abstract
The invention discloses a high-cost performance system for controlling combustion redundancy of a coal-fired heat transfer material heater, which relates to the technical field of DCS industrial control systems, in particular to the system for controlling the combustion redundancy of the coal-fired heat transfer material heater of a large-scale chain coal bed. The system comprises a PLC, an operation management system, a frequency conversion control technical system and a conventional electric control system. The combustion control and the heating circulation control of the control system are ensured by two sets of control systems and bumpless control right transfer is realized, and the two sets of systems have low cost and high cost performance, and ensure the safety and the reliability of heat medium heater control system; a humanized operator interface is adopted and an expert diagnostic system is provided; and control software is designed with a standardized, functionalized and modularized structure and has easily expanded functions, add programs and adjust parameters. The system ensures the safe production of a heat medium heater, heat medium temperature control accuracy and the probability of improving the combustion efficiency of fire coal, and has good control effect and relatively lower running cost.
Description
Technical field
The present invention relates to DCS industrial control system technical field, specifically refer to the system for controlling combustion redundancy of large-scale chain coal seam combustion heat carrier furnace (being called for short " heating agent stove ").
Background technology
Large-scale heat carrier furnace (being called for short " heating agent stove ") as large-scale heating equipment, is widely used in many industries such as chemical industry, petrochemical industry, metallurgy, weaving, plastics.The develop rapidly of industry be unable to do without heating equipment, and therefore, this thermal power transfer equipment of large-scale heating agent stove also has the bigger market demand.
Coal-fired heating agent stove be a kind of be fuel (combustion of grate chain coal seam) with the coal, with the conduction oil is heat carrier (abbreviation heating agent), utilize oil circulating pump to force closed circuit liquid phase circulation, heat energy is flowed to behind the hot equipment, continue to return the extraordinary industrial furnace of the single flow that heats again in the stove.Its operational characteristic is high temperature, low pressure, the circulation of pressure liquid phase.Temperature can be up to 340 ℃ about, pressure is lower than 1MPa.Because during the heating agent overtemperature, can decompose, rotten, on the boiler tube inwall, form " coking ", conduction oil is scrapped, also can badly damaged stove, even cause the equipment human casualty accident, owing to the heat request of using of production process continous-stable, therefore, safe and reliable control system is to guarantee safe operation of the boiler and provide the user to stablize the key of thermal source simultaneously.
The control of coal-fired heating agent stove has the control of the instrument of employing, and PLC control and DCS control are also arranged.The characteristics of instrument control are simple, low price, but temperature controlled fluctuation is big, controls very flexible, system reliability is low.PLC and DCS control, reliability height, system can expand, and the PLC system price is high slightly, and the DCS system price is the highest.But along with the development of control technology and the maturation of controller product, energy-saving and cost-reducing requirement and with the raising of heat request in the production process, therefore adopting PLC and DCS to control is development trend.
In some important productions, need 24 hours every days, annual 365 days continual heat supply, usually need the redundancy control system of dual fail-safe, guarantee the operation of the continous-stable of heating agent stove.Conventional redundancy control system, mainly be meant double CPU controller redundancy (comprising hardware redundancy and software redundancy), because CPU is the heart of control system, in case cpu fault, can cause the paralysis of The whole control system,, consider the cost problem again therefore in order to improve system reliability, only the heart to control system carries out redundancy, and this redundancy can not solve the problem that other module failures brought except that CPU; And if all redundant systems of employing CPU and I/O, then appropriate litigation fees costliness.
Summary of the invention
Purpose of the present invention is to overcome the cost height of above-mentioned conventional redundant system or can not protect and the burning control ratio of coal-fired heating agent stove difficulty the fault beyond the CPU module, and when the temperature accuracy of having relatively high expectations with thermic load, temperature control precision is difficult to be reached; It is insufficient to burn, and efficiency of combustion is low, and the coal ash that does not have after-flame can cause disappearances such as severe contamination to environment along with fume emission, and the automatic control system of the coal-fired heating agent stove that proposes.Native system adopts the high reliability and low cost design of two CPU, two acquisition circuit and dual-control loop, the coal burning heat medium furnace combustion control system adopts the main product PLC and the industrial computer of the Industry Control of current maturation to form, with a temperature control difficult problem and the raising efficiency of combustion that solves coal-fired heating agent stove, raise labour productivity, improve the reliability of heating agent stove safe operation.
As everyone knows, PLC develops so far, has become reliability is very high, powerful, speed is fast, real-time good, network function is complete controller that is applicable to various Industry Control occasions or system; Industrial computer is different from general business PC, is applicable to anti-interference strong, computer that reliability is high under the industrial control condition.With PLC do that controller, industrial computer do that the control system that the operation supervisor forms has the reliability height, control function is strong, man-machine interaction good, data handle fast, management function is complete, system can expand and characteristics such as life cycle length.
The coal burning heat medium furnace system for controlling combustion redundancy of a kind of high performance-price ratio of the present invention comprises burning control and heat supply loop control two parts.Burning control is the control HTM Furnace, makes heating agent arrive the temperature that requires; The heat supply loop control is the transmission of control heating agent, the heating agent of heating is sent to used hot equipment, the heating agent that returns to send the heating of heating agent stove back to.Single stove control is to be a control module with every heating agent stove; System control is to be a control module with each heating system.
In order to ensure the safety of system and reliable, adopt secondary control, the redundancy control system of multistage guarantee.Wherein, secondary control is meant in the control of heating agent stove heat production production process, has two controllers to control it: system's control and the control of single stove realize burning control; System's control and public control realize the heat supply loop control, and select control mode by control (referring to object is implemented the power of control) switching.In system, control has only one, that is to say at synchronization, has only a controller to carry out control to object.
Under normal circumstances, control is controlled in system, and the burning control of heating agent stove and heat supply loop control are to be controlled by system to finish; And under the situation of system's control fault, control switches to single stove control and public control, be that single stove is controlled the heating agent stove control function in the control of replacement system, heat supply loop control function in the control of public control (being meant the control of system's shared device in addition) replacement system guarantees that heating agent stove and heating system are in the controlled scope of safety always.
The PLC controller that adopts SIEMENS S7-300 is as system controller, and performance that it is good and modular construction are controlled powerful, Maintenance and Repair convenience.
The PLC controller that adopts SIEMENS S7-200 is as single furnace controller, though powerful not as the PLC controller of SIEMENS S7-300, as the additional adjusting control of the short time of system, its performance also can meet the demands.Multistage guarantee is meant the guarantee of secondary control guarantee, variable frequency regulating speed control and conventional electrical control.
Adopt frequency conversion control technique, two main electrical equipment of control pipestill for heat carrier: variable frequency adjustment blower speed and fire grate speed, make control more flexible, power savings is good simultaneously.Adopt public air inducing in the system, the air inducing amount of every stove is regulated by the exhaust pass butterfly valve and is realized.
Control algolithm adopts intelligent PID technology and control technologys such as self adaptation and feedforward, solves difficult problems such as non-linear in the coal-fired heating agent furnace temperature adjusting, that disturbance is many, hysteresis is big, inertia is big.
The standardization of control The software, functionalization, modular structure, function expansion and program increase and the adjustment of parameter is very easy to, deal with many disturbances that may occur in the Combustion Process Control and overcome new function that emergency processing and system with unpredictable element need increase etc.
Adopt the operator interface of hommization and expert diagnostic system is provided, handled easily personnel operation, maintenance system, the accident that the factors such as manual operation, carelessness that reduce cause may.
System forms
The coal burning heat medium furnace combustion control system is a network control system, change to some extent according to different heating agent furnace project configurations, but overall system architecture can be divided into upper, middle and lower-ranking: operational administrative layer, system's key-course and single stove key-course.
The upper strata is the operational administrative layer, is made up of several bookkeeping stations (engineer station and operator station) and the network equipment, realizes the operational administrative function of man-machine interaction.The bookkeeping station is made up of industrial computer, display, printer etc., to the service data and the equipment state of heating agent furnace system show, warning, storage etc. handle and management; Send operations of operators order (opening stove/blowing out order, equipment on/off commands and pre-set parameter etc.) to heating agent furnace control system (man-machine interaction); Functions such as inquiry in the record of realizing various data (comprising operational order) on the screen, on the printer (magnetic recording and printing are drawn and write down) and historical data.
The middle level is the control system center, system's switch board of a heating system configuration, functions such as the data acquisition of realization heating agent furnace system, loop adjusting, sequential control, logic control, safety interlocking control and integrated alarm.Each system's switch board is heating agent stove switch board, spot sensor, transmitter, executing agency and other equipment electrical control cubicles of direct join dependency downwards, gather the real-time running data and the equipment working condition signal of related system, the operation of control relevant device, regulate the speed of service of air blast, air-introduced machine and fire grate, make that the heating agent stove operates under the good operating mode, heat medium outlet temperature is stabilized in the scope of setting, the heating agent rate of discharge of heat supply circulation and pressure keep stable; Upwards by Ethernet switch (or other network equipments), link to each other with an engineer station with operator station, send the analog quantity of collection and the status signal of switching value signal and equipment to work station, simultaneously the operational order that executable operations person stands and the engineer station sends.
Lower floor is single stove key-course, is made up of heating agent stove switch board and equipment electrical control cubicles.The operation of a heating agent stove of each heating agent stove switch board control realizes loop adjusting, sequential control, logic control, the safety interlocking control of this heating agent stove.Heating agent stove switch board comprises the electrical control of heating agent stove and control automatically.The control that can carry out the control of system control and single stove on heating agent stove switch board is switched and is selected, and when switching to single stove control, the control of this stove (comprise manual control and control automatically) all realizes on this switch board; When the selection system controlled, the control of this stove all realized that by system's switch board heating agent stove switch board is only used as electrical control.Heating agent stove switch board has automatic control function equally, but it just temporarily exercised control function automatically when system's control was lost efficacy, and is therefore comparatively simple.
Description of drawings
Fig. 1 is the example structure block diagram of a kind of coal-fired combustion control system of heat medium heater of the present invention;
Fig. 2 is that air blast speed regulating control power is switched schematic diagram in the embodiments of the invention;
Fig. 3 is a control switching controls software flow pattern of the present invention.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples
Given below is nine the 7000000 coal-fired heating agent stove DCS control system structured flowcharts (as shown in Figure 1) of kilocalorie.
A heating agent furnace project automatic control system of the present invention, control comprises nine coal-fired heating agent furnace systems of three heat supply circulatory systems.
The upper strata is made up of four operator stations, engineer station and Ethernet switch.Operator station and engineer station dispose LCDs, EPSON printer etc. when grinding magnificent PIII industrial computer, ViewSonic 19 respectively.Under the normal condition, control four subsystems (corresponding C01, C02, C03, C04 four systems switch board) operated respectively by four operator stations, and an engineer station uses as system management.Four operator station software and hardware configuration conformance to standard can backup each other.
Totally four of the switch board C01 of system, C02, C03, C04, wherein C01, C02, C03 are respectively HCP-1, HCP-2 and three heating system switch boards of BCP-1, C04 is the public system switch board.Each system's switch board, as master controller, outer transmitter etc. are by the double switch power power supply by the S7-300PLC of SIEMENS, and main components and parts are selected the reliable brand of high-quality for use, guarantee the safe, stable, reliably of control system.Three heating system switch boards, software and hardware configuration are just the same, are convenient to maintenance and management.
Heating agent stove switch board has nine C27-C29, C37-C39, and C47-C49, nine pipestill for heat carrier of respectively corresponding three heat supply circulatory systems are realized electrical control and the speed regulating control and the power supply of heating agent furnace apparatus.Simultaneously, when system controls when unusual, the control and regulating automatically of the separate unit stove of can the replacement system realizing the heating agent stove.Heating agent stove switch board disposes S7-200PLC, frequency converter, switch, contactor and the guidance panel etc. of SIEMENS.
Also has the C05UPS power distribution cabinet in addition; C11-C17 air-introduced machine electrical control cubicles; C21-C26, C31-C36, C41-C44 circulating pump and booster pump electrical control cubicles; The comprehensive electrical control cubicles of C45.
Key technology
Secondary control framework
Adopt the secondary control framework of system-level and heating agent stove level, low cost has realized the redundancy control capability of system, has guaranteed long-term safe and reliable of control system.
Requirement at the controller redundancy, provided the implementation of control system redundancy: system's control and the control of heating agent stove, not only control system cost but also satisfied user's requirement, solve user's trouble and worry, guaranteed the continuous operation of 24 hours, 365 days not blowing out of fault of heating agent furnace control system.
The implementation of Redundant Control has multiple, have fully independently two cover control systems redundancy, redundancy of control system middle controller or the like is arranged, purpose is one, is exactly that another set of control system works when a cover control system lost efficacy.Because the heating agent furnace project is supporting for polyester process, requiring provides stable thermal source, in case control system fault and produce blowing out, heat source temperature can change, and will cause heavy losses to polyester, therefore guarantees that heating agent stove safety and stability is very important.And the heating agent furnace system is not to be a unmanned system, adopts duplicate two control system redundancies, and cost height, cost are big; Adopt the controller redundancy scheme, than the cost of preceding a kind of scheme be saved many, but can not solve fault effects except that controller.Therefore this sets of plan of providing of the present invention, secondary control is two separate control systems, adopts different configurations again, adapts to different demands, the reliability of raising system, and realized the redundancy control capability of system with minimum cost (than preceding two kinds of schemes).
The SIEMENS S7-300PLC of the modular construction of system's control configuration superior performance regulates, controls and manage three heating agent stoves, a heating system; The relatively more easy SIEMENS S7-200PLC of single stove control configuration compares simple adjusting, control and management to every heating agent stove.The heating agent furnace project is system's control under the normal condition, in case it is unusual that system's control occurs, can on heating agent stove switch board, switch by one " key ", be transformed into single stove control immediately, the auxiliary control of the security control of realization heating agent stove, adjustment, combustion chamber draft adjusting, miscellaneous equipment etc.Because that system's control is adopted is the PLC of modular construction, so fault correction time is extremely short; Single stove control is not to be in long control, and degree of regulation meets the demands fully, and efficient, reliable, the safety of system have been guaranteed in the realization of this secondary control.
The no disturbance of control is switched
Control to single stove control from system, or control to system control from single stove, or forward automatic control to from manual control, because the heating agent stove needed run without interruption in 24 hours, 365 days, owing to the link of some manual adjustment of pipestill for heat carrier, therefore all devices operation held stationary in carrying out the control handoff procedure needs only a knob and just can realize switching again, and do not need the operator to carry out complex operations, guarantee that system is in safety, controlled in service always.The realization of this function is exactly before switching controls power, and system and heating agent stove two cover control systems keep running status always, the supporting realization of hardware and software of two cover control systems.
With the air blast is example (as shown in Figure 2), illustrates by a Switch Control power.This is a three-position switch.During normal the operation, switch places " left side " side, is in system running pattern, controls and regulate the frequency converter operation by system controller output " RAO " and " RDO "; When switch forwards the centre position to, promptly switch to single stove control model, be to control and regulate the frequency converter operation by single furnace controller " LAO " and " LDO "; When switch forwards " right side " side to, be manual mode, control and regulate the frequency converter operation by the panel operation button.Other electrical equipment control too.
The no disturbance of control is switched software and is realized may further comprise the steps (as shown in Figure 3):
Whether control in this locality is → algorithm process → output control; Otherwise, deny → read frequency converter rate signal and status signal → with local output tracking input signal.
System's control is the same with the software control flow process of single stove control.Heat is equipped with control system (not having control) and follows the tracks of frequency converter (actuator) state constantly, and its output is consistent with actuator, when control is switched, can not produce disturbance.
Expert system
The expert diagnostic system of accident analysis and combustion analysis is realized, helps fault to get rid of and the raising efficiency of combustion.
The expert diagnostic system of heating agent furnace control system, handled easily person, keeper understand the running status of current pipestill for heat carrier, in time fix a breakdown or adjust manually-operated given (as the adjustment of giving coal seam thickness etc.).
Expert diagnostic system is based on the reasoning and the demonstration of supposition on operator's screen of the various experience and knowledge set of control object and control law.The expert system of heating agent furnace control system comprises fault analysis and diagnosis and fired state analysis two parts.
Fault analysis diagnosis system is when fault occurs, and occurs eye-catching warning message on the operator station screen immediately, after entering the inquiry picture of reporting to the police, can see the probable cause analysis that fault takes place, and goes and finds out what's going on to help the operator, takes appropriate measures.
Fired state is analyzed, and is to realize on every pipestill for heat carrier function screen of operator station.When calculating based on quantity combusted, the Actual combustion amount is calculated when taking place to take place to depart from more greatly with air blast speed governing (burns oxygen amount) than large deviation or fire grate (fuel quantity) with theoretical, the current combustion case of alert is bad, increase or reduce coal seam thickness, improves efficiency of combustion.
Standardization, modularization
Standardization, open system architecture, expanding system function, increase and decrease system configuration flexibly and easily.
Owing to all adopt modular structure from hardware to software, the heating agent furnace control system can carry out different configurations according to the size of actual engineering, satisfies the demand of engineering.
Systematic technical indicator
Operator station and engineer station
Operator station and engineer station can be provided with 1 platform at the most according to user's needs.
Each work station main hardware configuration industrial computer, display, mouse, keyboard, printer (optional), Network Fittings.Software configuration Microsoft Windows 2000 Professional operating systems, network software, KingView monitoring software etc.
System's switch board
Size (or heat supply circulatory system) according to engineering is configured.As the heating agent furnace system of four 8,000,000 kilocalories,, therefore dispose system's switch board owing to be a heating system; As nine 7,000,000 kilocalorie pipestill for heat carrier systems, owing to be three heat supply circulatory systems, so configuration signal isolator, relay etc.Software configuration relevant PLC control software four systems switch board, wherein three are heat supply circulatory system switch board, another is the synergic system switch board.
The configuration of each system's switch board mainly contains PLC, Switching Power Supply, signal isolator, relay of modular construction etc.
Heating agent stove switch board
Be configured heating agent stove switch board of a heating agent stove configuration according to heating agent stove number.
The configuration of each heating agent stove switch board mainly contains the electrical matching of small PLC, Switching Power Supply, signal isolator, relay, guidance panel, frequency converter and heating agent furnace apparatus etc.Software configuration relevant PLC control software.
Control accuracy
By the variable frequency adjustment of the variable frequency adjustment of fire grate, air blast and the variable frequency adjustment or the throttle opening of air-introduced machine are regulated, when making heating agent stove stable state:
1) design temperature-1 ℃≤heat medium outlet temperature≤design temperature+1 ℃
2) setting pressure-5Pa≤furnace pressure≤setting pressure+5Pa
Novelty
1) expert system that the fired state that provides is analyzed can help the operator to regulate the manual adjustment link of heating agent stove, has improved efficiency of combustion.
2) two level frameworks of controlling with system's control and heating agent stove list stove, low-cost, realized the Redundant Control of heating agent stove highly reliably, solved the problem of control system zero failure blowing out, made coal-fired heating agent furnace system keep 24 hours/day, 365 days/year continuous uninterrupted can control, can regulate.
Energy-conservation situation
The coal-fired heating agent furnace control system first cover heat supply circulatory system puts into operation, up to the present existing many cover heating systems, tens of heating agent matchmaker stoves put into operation, and system is reliable stable, and fired state is good, satisfy user's requirement, obtained user's favorable comment.
The fuel (fuel oil and fire coal) that need consume with the heating agent stove of one 7,000,000 kilocalorie is compared as follows table, carries out pipestill for heat carrier operating cost relatively:
| Project | Fuel oil | Coal-fired |
| Pipestill for heat carrier power (the unit kilocalorie/hour) | 7,000,000 | 7,000,000 |
| Efficient % | ??90 | ??80 |
| Fuel | Crude oil | ??AII |
| Fuel low heat value (MJ/kg) | ??41.3 | ??17.693 |
| Fuel Consumption kg/h | ??788.5 | ??2070 |
| Fuel price unit/kg | ??1.2 | ??0.3 |
| Ten thousand yuan/year of fuel costs | ??829 | ??544 |
(above fuel price is situation in 2004.)
As seen from the above table, the coal-fired heating agent stove of one 7,000,000 kilocalorie was saved near 3,000,000 RMB than the fuel price of the fuel oil heating agent stove consumption of same power in 1 year, and the coal-fired heating agent stove of nine 7,000,000 kilocalories was just saved 25,650,000 RMB in 1 year.Still with the result of 80% efficiency calculation, if improve efficiency of combustion to 90%, operating cost more can reduce for this.Therefore, the control system of the coal-fired heating agent stove of nine 7,000,000 kilocalories do not need 2 months just can be from the fuel cost of recouping capital outlay.
In recent years, in China's rapid development of economy process, energy consumption structure is unreasonable, the imbalance between supply and demand aggravation becomes increasingly conspicuous.Coal is the basic energy resource of China, plays leading position in energy consumption structure, saves and alternative fuel oil, meets the energy development policy of China.
The realization of coal-fired heating agent furnace control system has been guaranteed the safety in production of pipestill for heat carrier, the control accuracy of heat medium temperature and the possibility of raising fired coal combustion efficient from control.Since its good control effect, lower operating cost, and making coal-fired heating agent stove substitute fuel oil heating agent stove becomes possibility, and has vast market prospect.
Claims (3)
1. the coal burning heat medium furnace system for controlling combustion redundancy of a high performance-price ratio comprises the PLC controller, and Operational Management System and frequency conversion control technique system and conventional electric control system is characterized in that,
Described control system structure comprises operational administrative layer, system's key-course and single stove key-course upper, middle and lower-ranking;
Simultaneously, the control of heating agent stove heat production production process is adopted system's control and the control of single stove, and controls in system under the situation of fault, can substitute realization by single stove control by the no disturbance handoff functionality of control;
Described frequency conversion control technique system comprises the adjusting of blower speed and fire grate speed;
Be handled easily personnel's operation, system maintenance, reduce the accident possibility that causes because of manual operation, ignorance factor, adopt the operator interface of hommization and expert diagnostic system is provided;
And adopt increasing and the control software design of the adjustment of parameter of standardization, functionalization, modular structure and function expansion and program.
2. the coal burning heat medium furnace system for controlling combustion redundancy of a kind of high performance-price ratio as claimed in claim 1 is characterized in that, the coal burning heat medium furnace combustion control system is a network control system, change according to different pipestill for heat carrier engineering configurations, wherein,
Described upper strata is the operational administrative layer, is made up of several bookkeeping station and network equipments of realizing the man-machine interactive operation management function;
The bookkeeping station is made up of industrial computer, display, printer and software configuration, and the service data and the equipment state of heating agent furnace system shown, reports to the police, stores processing and manage;
With the operations of operators order, comprise and open stove/blowing out order, equipment on/off commands and pre-set parameter, send heating agent furnace control system to human-computer interaction function; Realizing various data on the screen, on the printer, comprising through magnetic recording and the record of the operational order of printing the record of drawing and the inquiry of historical data;
Described middle level is the control system center, is made up of system's switch board of a heating system configuration, with data acquisition, loop adjusting, sequential control, logic control, safety interlocking control and the integrated alarm of realizing the heating agent furnace system;
Each system's switch board is heating agent stove switch board, spot sensor, transmitter, executing agency and other equipment electrical control cubicles of direct join dependency downwards, gather the real-time running data and the equipment working condition signal of related system, the operation of control relevant device, the speed of service of regulating air blast, air-introduced machine and fire grate; Upwards by Ethernet switch or other network equipments, link to each other with an engineer station with operator station, send the analog quantity of collection and the status signal of switching value signal and equipment to work station, simultaneously the operational order that executable operations person stands and the engineer station sends;
Described lower floor is single stove key-course, is made up of heating agent stove switch board and equipment electrical control cubicles, and the operation of a pipestill for heat carrier of each heating agent stove switch board control realizes loop adjusting, sequential control, logic control, the safety interlocking control of this heating agent stove;
Described heating agent stove switch board comprises the electrical control of heating agent stove and control automatically;
The configuration of each heating agent stove switch board mainly contains the electrical matching and the configuration of relevant PLC control software of small PLC, Switching Power Supply, signal isolator, relay, guidance panel, frequency converter and pipestill for heat carrier equipment;
The control that can carry out the control of system control and single stove on heating agent stove switch board is switched and is selected, and when switching to single stove control, the control of this stove comprises manual control and controls automatically and all realize on this switch board; When the selection system controlled, the control of this stove was realized by system's switch board that all heating agent stove switch board is only as electrical control usefulness, and when system's control was lost efficacy, heating agent stove switch board was exercised control function automatically;
Control to single stove control from system, or control to system control from single stove, or forward automatic control to from manual control, this function is by before switching controls power, system's control and single stove are controlled two cover systems and are kept running status always, the supporting realization of hardware and software of two cover control systems.
3. the coal burning heat medium furnace system for controlling combustion redundancy of a kind of high performance-price ratio as claimed in claim 1 or 2 is characterized in that,
The no disturbance handoff functionality of described control, the following operation of switching by three-position switch:
During normal the operation, switch places " left side " side, is in system running pattern, and " RAO " and " RDO " that exported by system controller controls and regulate the frequency converter operation;
When switch forwards the centre position to, promptly switch to single stove control model, control and regulate the frequency converter operation by single furnace controller " LAO " and " LDO ";
When switch forwards " right side " side to, be manual mode, control and regulate the frequency converter operation by the panel operation button;
The no disturbance of control is switched software and is realized may further comprise the steps:
Whether control in this locality is → algorithm process → output control; Otherwise, deny → read frequency converter rate signal and status signal → with local output tracking input signal.
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| CN1587820A (en) * | 2004-09-08 | 2005-03-02 | 大连理工大学 | Intelligent control system for boiler and its multiple type of coal control method |
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