CN102324725B - Failure security protection method of three wastes fluidization mixing combustion furnace and device - Google Patents
Failure security protection method of three wastes fluidization mixing combustion furnace and device Download PDFInfo
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- CN102324725B CN102324725B CN 201110111945 CN201110111945A CN102324725B CN 102324725 B CN102324725 B CN 102324725B CN 201110111945 CN201110111945 CN 201110111945 CN 201110111945 A CN201110111945 A CN 201110111945A CN 102324725 B CN102324725 B CN 102324725B
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Abstract
A failure security protection method of a three wastes fluidization mixing combustion furnace and a device relate to a security protection method of the three wastes fluidization mixing combustion furnace which is matched with the production of synthesis ammonia and methyl alcohol. The device is characterized by further comprising a data communication system (DCS) or programmable logical controller (PLC) central processing unit, an on/off signal breaker of a draught fan, a current signal sensor of the draught fan and a rotating speed signal sensor of the draught fan, wherein the current signal and the rotating speed signal of the draught fan respectively enter the DCS or PLC central processing unit to be compared with standard set values; the comparison value and the digitized on/off signal of the draught fan are judged by the 'one plus two' logic of a logic processing device, if the judgment reaches the standard, the logic processing device outputs the digital quantity command, so the normally closed contact of a final control relay is switched off, and all the solenoid valves and switch power circuits are switched off. The invention has the advantages of timely and accurately judging the failure of the draught fan, intelligently closing wastes valves and three draught fans, and preventing accidents from being caused.
Description
Technical field:
The present invention relates to the security protection technology of the supporting three-waste fluidized mix combustion furnace of synthetic ammonia, methanol production.
Background technology:
Three-waste fluidized mix combustion furnace has used the combustion characteristics of ebullated bed, uses the returning charge recovery technology of CFBB, has adopted the pattern of blowing-out gas waste heat boiler.The waste gas that ammonia is produced, waste residue, useless ash can reach mixed combustion simultaneously, when the single fire blowing-out gas, this stove will become a blowing-out gas waste heat boiler, free burning coal (or sulphur coal), spoil, cinder etc. will become a fluidized-bed combustion boiler, and slag, gas, coal multifuel combustion will become gas, solid fluidisation mixed combustion furnace.
Its structure is that mixed combustion furnace is provided with the blowing-out gas electromagnetically operated valve, the pressure-releasing electromagnetic valve of speeding, methyl alcohol pneumoelectric magnet valve, coal charge charging aperture, outlet port.Outlet port flow through combined dust remover, waste-heat oven, electrostatic precipitator, enter chimney by the induced draft fan wind-guiding, and waste-heat oven also is provided with gas off-take, by primary air fan, secondary air fan water conservancy diversion, is fed back to mixed combustion furnace respectively.
When waste gas, waste residue, useless ash mix combustion in three-waste fluidized mix combustion furnace, induced draft fan breaks down, and after the decline of fan trouble furnace temperature, and operation not in time, and waste gas still can be blasted toward the interior conveying of stove.
Summary of the invention:
The object of the invention is to overcome above-mentioned defect, a kind of failure security protection method of three wastes fluidization mixing combustion furnace and device are provided.
Method scheme of the present invention is: comprise the blowing-out gas electromagnetically operated valve, the pressure-releasing electromagnetic valve of speeding, methyl alcohol pneumoelectric magnet valve, primary air fan relay switch, secondary air fan relay switch, induced draft fan relay switch, it is characterized in that: also have additional DCS or PLC central processing unit, induced draft fan start-stop signal circuit breaker, induced draft fan current signal sensor, induced draft fan rotary speed signal sensor; Induced draft fan current signal, tach signal enter respectively DCS or PLC central processing unit and compare with the typical set value of setting respectively after the A/D converter digitlization; Signal after both comparison value signals and induced draft fan start-stop are signal digitalized is input to respectively in logic processing device " one adds two " logic voting of carrying out three signals, as long as the start-stop signal adds that other any signals are up to standard, logic processing device is exported the digital quantity instruction, make to carry out the relay normally-closed contact and disconnect, cut off blowing-out gas electromagnetically operated valve, the pressure-releasing electromagnetic valve of speeding, methyl alcohol pneumoelectric magnet valve, primary air fan relay switch, secondary air fan relay switch power circuit.
Device scheme of the present invention is: comprise the blowing-out gas electromagnetically operated valve, the pressure-releasing electromagnetic valve of speeding, methyl alcohol pneumoelectric magnet valve, primary air fan relay switch, secondary air fan relay switch, induced draft fan relay switch, it is characterized in that: also have additional DCS or PLC central processing unit, induced draft fan start-stop signal circuit breaker, induced draft fan current signal sensor, induced draft fan rotary speed signal sensor; DCS or PLC central processing unit also comprise:
For receiving the induced draft fan current signal, and carry out computing current value comparator relatively with typical set value;
For receiving the induced draft fan tach signal, and carry out computing tachometer value comparator relatively with typical set value;
Carry out " one adds two " logical operation for three signals will inputting, and " one adds two " logic operation result is transferred to the logic processing device of digital output fiduciary level transducer;
Current value comparator, tachometer value comparator respectively with the logic processing device connection;
After induced draft fan current signal sensor, induced draft fan rotary speed signal sensor serial connection A/D converter, with current value comparator, the tachometer value comparator circuit of DCS or PLC central processing unit, be connected respectively;
After induced draft fan start-stop signal circuit breaker serial connection digital quantity input fiduciary level transducer with the logic processing device connection;
After logic processing device serial connection digital output fiduciary level transducer, with the execution relay circuit that cuts off contactor, be connected;
Carry out relay some to the normally closed switch contact be serially connected with respectively the blowing-out gas electromagnetically operated valve, the pressure-releasing electromagnetic valve of speeding, methyl alcohol pneumoelectric magnet valve, primary air fan relay switch, secondary air fan relay switch power circuit.
The invention has the advantages that: can promptly and accurately judge the induced draft fan fault, and intelligent waste gas valve and three blower fans of sending in the three-waste fluidized mix combustion furnace stove of closing, avoid the generation of accident.
The accompanying drawing explanation:
Fig. 1 is mixed combustion furnace operational process schematic diagram.
Fig. 2 is apparatus of the present invention schematic diagram.
Fig. 3 is " one adds two " logic processing device simulation drawing.
Embodiment:
Method of the present invention is: comprise blowing-out gas electromagnetically operated valve 1, the pressure-releasing electromagnetic valve 2 of speeding, methyl alcohol pneumoelectric magnet valve 3, primary air fan 5 relay switchs, secondary air fan 6 relay switchs, induced draft fan 7 relay switchs, it is characterized in that: also have additional DCS or PLC central processing unit, induced draft fan 7 start-stop signal circuit breakers, induced draft fan 7 current signal sensor, induced draft fan 7 rotary speed signal sensors; Induced draft fan 7 current signals, tach signal enter respectively DCS after the A/D converting digital or PLC central processing unit logic area compares with the typical set value of setting respectively; Signal after both comparison value signals and induced draft fan 7 switching signal digitlizations carries out " one adds two " logic voting of three signals in logic area, as long as the start-stop signal adds that other any signals are up to standard, after logic processing device is exported the digital quantity instruction, make to carry out the relay normally-closed contact and disconnect, cut off blowing-out gas electromagnetically operated valve 1, the pressure-releasing electromagnetic valve 2 of speeding, methyl alcohol pneumoelectric magnet valve 3, primary air fan 5 relay switchs, secondary air fan 6 relay switch power circuits.
Structure of the present invention comprises blowing-out gas electromagnetically operated valve 1, the pressure-releasing electromagnetic valve 2 of speeding, methyl alcohol pneumoelectric magnet valve 3, primary air fan 5 relay switchs, secondary air fan 6 relay switchs, induced draft fan 7 relay switchs, it is characterized in that: also have additional DCS or PLC central processing unit, induced draft fan 7 start-stop signal circuit breakers, induced draft fan 7 current signal sensor, induced draft fan 7 rotary speed signal sensors; DCS or PLC central processing unit also comprise:
For receiving induced draft fan 7 current signals, and carry out computing current value comparator relatively with typical set value;
For receiving induced draft fan 7 tach signals, and carry out computing tachometer value comparator relatively with typical set value;
Carry out " one adds two " logical operation for three signals will inputting, and " one adds two " logic operation result is transferred to the logic processing device of digital quantity digital output fiduciary level transducer;
Current value comparator, tachometer value comparator respectively with the logic processing device connection;
After induced draft fan 7 current signal sensor, induced draft fan 7 rotary speed signal sensor serial connection A/D converters, with central processing unit current value comparator, the tachometer value comparator circuit of DCS or PLC, be connected respectively;
After induced draft fan 7 start-stop signal circuit breakers series connection digital quantities input fiduciary level transducers with the logic processing device connection;
After logic processing device serial connection digital output fiduciary level transducer, with the execution relay circuit that cuts off contactor, be connected;
Carry out relay some to the normally closed switch contact be serially connected with respectively blowing-out gas electromagnetically operated valve 1, the pressure-releasing electromagnetic valve 2 of speeding, methyl alcohol pneumoelectric magnet valve 3, primary air fan 5 relay switchs, secondary air fan 6 relay switch power circuits.
Control principle is: the interlocking action of alarm interlocking device must in time, accurately, reliably occur to avoid the unnecessary accident of malfunction or tripping, and therefore gathering " induced draft fan 7 fault-signals " must be promptly and accurately.The present invention is the next, and to take DCS or PLC central processing unit be core, gather the start-stop signal of induced draft fan 7 by the input module of different types of data simultaneously, current signal, tach signal, the comparison value of setting with the comparator in DCS or PLC compares, this comparison value needs pre-set according to production control, the output valve of comparator after relatively used " one adds two " voting logic computing again, to realize when induced draft fan 7 fault, DCS or PLC send the interlocking output signal and close the waste gas sent in three-waste fluidized mix combustion furnace 4 stoves (as blowing-out gas simultaneously in 50ms, off-gas, methyl alcohol is dropped a hint etc.) the valve signal, the primary air fan 5, secondary air fan 6 of simultaneously interlocking shut down, and makes three-waste fluidized mix combustion furnace 4 in dead ship condition, guarantees the safety of device.With Time Controller, detected induced draft fan 7 start-stop signals, current signal, tach signal are transferred to host computer, realize parameter monitoring.
When induced draft fan 7 fault, be that induced draft fan 7 may be due to certain device fault in circuit loop, as closing switch damages, or line broken circuit or circuit breaker damage or overcurrent or electric current are crossed and owed, or the various faults that causes such as induced draft fan 7 faults itselfs, by electrical system, this breakdown switch amount signal is exported to the input interface digital module of DCS or PLC, convert after the fiduciary level digital quantity logic area that is transferred to DCS or PLC to and carry out the logical process computing.The " RUN " of induced draft fan 7 and " fault " be take " opening " signal and " stopping " signal for identifying.
Induced draft fan 7 start-stop signals are taken from the auxiliary contacts of circuit breaker signal be attempted by the induced draft fan control circuit, this contact is opened or is closed signal and sends to DCS or PLC system input interface digital module, converts to after the fiduciary level digital quantity to enter DCS or the PLC logic area carries out the logical process computing.
When normal, power circuit breaker closes a floodgate, and auxiliary contacts of circuit breaker is closed, the conducting of induced draft fan control circuit, and induced draft fan is in the operation operating state.Otherwise power supply disconnects, auxiliary contacts of circuit breaker is opened, and induced draft fan is in the state of quitting work.
DCS or PLC gather induced draft fan 7 start-stop signals may be due to the auxiliary contacts of circuit breaker loose contact, or module damage while advancing DCS or PLC system, or the many factors such as its wiring disconnection, and can't normally collect, gather induced draft fan 7 current signals or tach signal so increase, judge accurately operation or the malfunction of induced draft fan 7 with intelligence, in case the unnecessary accident of interlock system generation malfunction or tripping.
Central processing unit receives above three signals, and the host computer picture shows " electric current " value, " rotating speed " value and " open/stop " state etc., for operation supervise and control.The value of this actual current value and comparator setting is compared simultaneously, when current value≤set point, analog quantity converts the digital quantity of soft contact to, equally the value of actual speed value and comparator setting is compared, when tachometer value≤set point, analog quantity converts the digital quantity of soft contact to, induced draft fan 7 current signals, tach signal and induced draft fan 7 start-stop signal three signals can be formed to interlock logic circuit ladder diagram, carry out the logical operation judgement in PLC.
When induced draft fan 7 operations are broken down, after electrical system is sent induced draft fan 7 and " is stopped " switching value signal standards level digital, enter DCS or PLC control system logic area, enter DCS or PLC control system logic area after induced draft fan 7 current signals or tach signal A/D converting digital simultaneously, as electric current≤10A, (this value is default, should take concrete production status and determine) or rev/min (this value is default in rotating speed≤300, should determine with concrete production status) analog quantity converts the digital quantity of soft contact to, DCS or PLC central processing unit logic processing device carry out " one adds two " voting logic sequential operation by above contact close signal to be processed, if " one adds two " flexible cord circle R1 sends to obtain electric instruction, through digital output fiduciary level transducer output order, making to carry out relay obtains electric, one road normally opened contact is closed to warning system and carries out sound and light alarm, one road normally-closed contact is disconnected to interlock system and realizes interlocked control in 50ms, and the power of electromagnetic valve of the valve such as cut off that blowing-out gas, off-gas, methyl alcohol are dropped a hint is closed rapidly blowing-out gas, off-gas, the methyl alcohol valve such as drop a hint, cut off primary air fan 5, secondary air fan 6 power supplys simultaneously, make primary air fan 5, secondary air fan 6 Concatenate shut-downs, thereby realize the mixed combustion failure safe protection of three-waste fluidized mix combustion furnace 4 safety protection devices.
Claims (2)
1. failure security protection method of three wastes fluidization mixing combustion furnace, is characterized in that: utilize induced draft fan (7) current signal sensor, the sampling of induced draft fan (7) rotary speed signal sensor, induced draft fan (7) current signal, tach signal enter respectively DCS after the A/D converting digital or PLC central processing unit logic area compares with the typical set value of setting respectively, switching signal after the digitlization of both comparison value signals and the output of induced draft fan (7) start-stop signal circuit breaker is carried out " one adds two " logical operation of three signals in the logic processing device of DCS or PLC central processing unit logic area, as long as switching signal adds that other any comparison value signals are up to standard, logic processing device is exported the digital quantity instruction, making to carry out the relay normally-closed contact disconnects, cut off blowing-out gas electromagnetically operated valve (1), the pressure-releasing electromagnetic valve (2) of speeding, methyl alcohol pneumoelectric magnet valve (3), primary air fan (5) relay switch, the all power circuits of secondary air fan (6) relay switch.
2. failure safety protecting device for ' ' three wastes " fluidization mixed combustion furnace, comprise blowing-out gas electromagnetically operated valve (1), the pressure-releasing electromagnetic valve of speeding (2), methyl alcohol pneumoelectric magnet valve (3), primary air fan (5) relay switch, secondary air fan (6) relay switch, induced draft fan (7) relay switch, it is characterized in that: also have additional DCS or PLC central processing unit, induced draft fan (7) start-stop signal circuit breaker, induced draft fan (7) current signal sensor, induced draft fan (7) rotary speed signal sensor; DCS or PLC central processing unit also comprise:
For receiving induced draft fan (7) current signal, and carry out computing current value comparator relatively with typical set value;
For receiving induced draft fan (7) tach signal, and carry out computing tachometer value comparator relatively with typical set value;
Carry out " one adds two " logical operation for three signals will inputting, and " one adds two " logic operation result is transferred to the logic processing device of digital output fiduciary level transducer, three signals of described input refer to the switching signal after the digitlization of comparison value signal, the output of induced draft fan (7) start-stop signal circuit breaker of comparison value signal, the output of tachometer value comparator of current value comparator output, described " one adds two " logical operation refers to that logic processing device is exported the digital quantity instruction as long as switching signal adds that other any comparison value signals are up to standard;
Current value comparator, tachometer value comparator respectively with the logic processing device connection;
After induced draft fan (7) current signal sensor, induced draft fan (7) rotary speed signal sensor serial connection A/D converter, with current value comparator, the tachometer value comparator circuit of DCS or PLC central processing unit, be connected respectively;
After induced draft fan (7) start-stop signal circuit breaker series connection digital quantity input fiduciary level transducer with the logic processing device connection;
After logic processing device serial connection digital output fiduciary level transducer, with the execution relay circuit that cuts off contactor, be connected;
Carry out that relay is some is serially connected with respectively blowing-out gas electromagnetically operated valve (1), the pressure-releasing electromagnetic valve of speeding (2), methyl alcohol pneumoelectric magnet valve (3), primary air fan (5) relay switch, secondary air fan (6) relay switch power circuit to the normally closed switch contact.
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| CN 201110111945 CN102324725B (en) | 2011-04-29 | 2011-04-29 | Failure security protection method of three wastes fluidization mixing combustion furnace and device |
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| CN 201110111945 CN102324725B (en) | 2011-04-29 | 2011-04-29 | Failure security protection method of three wastes fluidization mixing combustion furnace and device |
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| CN103615322B (en) * | 2013-11-20 | 2016-01-20 | 内蒙古包钢钢联股份有限公司 | TRT unit overspeed control system and hypervelocity controlling method thereof |
| CN104297435B (en) * | 2014-10-29 | 2016-06-08 | 安徽淮化股份有限公司 | The industrial production on-line detecting system of a kind of synthetic gas preparing ethylene glycol |
| CN112833418A (en) * | 2020-12-31 | 2021-05-25 | 威立雅（哈尔滨）热电有限公司 | Method for preventing fan operation signal from being mistakenly operated to trigger boiler main fuel to trip |
| CN114811963B (en) * | 2022-05-19 | 2023-06-30 | 甘肃银光聚银化工有限公司 | Fire pressing method for three-waste furnace |
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