CN101654630A - Safe logic control method of pulverized coal gasifier - Google Patents
Safe logic control method of pulverized coal gasifier Download PDFInfo
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- CN101654630A CN101654630A CN 200910018249 CN200910018249A CN101654630A CN 101654630 A CN101654630 A CN 101654630A CN 200910018249 CN200910018249 CN 200910018249 CN 200910018249 A CN200910018249 A CN 200910018249A CN 101654630 A CN101654630 A CN 101654630A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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Abstract
The invention relates to a safe logic control method of a pulverized coal gasifier which is used for the logic control of the safe operation of a pulverized coal water-cooled wall gasifier. The methodcomprises the following control steps: running, resetting, emptying oxygen, igniting, running pulverized coal and stopping the gasifier. The invention can control the machine-driving sequence; when the process variable is out of limit, the mechanical equipment breaks down, the system breaks down or the powder source breaks off, the safe logic control system can automatically or manually, if necessary, finish the preset movement. Meanwhile, in order to ensure the security and availability of the system, the redundant structure of the sensor in the system is set to three choose two logic and the method designs the delay use interlocking and delay shutdown protective functions which can be adjusted according to the demands of production practices. In the pulverized coal water-cooled wall gasifier, the invention realizes the core of the process flow logic control, namely in ignition stage, oxygen can not enter into the gasifier before the fuel gas and in coal-feeding stage, high flow rateoxygen can not enter into the gasifier before the pulverized coal.
Description
Technical field
The present invention relates to a kind of logic control system that is used for the safe operation of fine coal water wall vapourizing furnace, relate in particular to a kind of powder coal gasification furnace security logic control method.
Background technology
Air-flow bed coal-gasification is state-of-the-art in the world now Coal Gasification Technology, be that raw material, cold-wall type vapourizing furnace are that the air flow bed pressurized gasification technology of characteristics has that coal adaptability is wide, raw material consumption is low, efficiency of carbon conversion is high, cold gas efficiency high-technology advantage with fine coal, the stronger market competitiveness is arranged.Present China is building and more than ten signatory this kind gasification technology projects all are introductions of foreign technology, the fine coal water wall technology of independent research has been finished pilot scale, as the control core one powder coal gasification furnace security logic Controlling System of vapourizing furnace practice test satisfy service requirements fully.
Summary of the invention
The purpose of this invention is to provide a kind of programmable controller (PLC) of utilizing and design a kind of security logic control method that fine coal water wall pressurized gasification prepares synthesis gas process that is applied to.Utilize computer software that these successive operations such as fine coal water wall vapourizing furnace start-stop car step are compiled into one section program according to temporal logical order, carry out the judgement and the operate continuously of processing condition by computer, reduce technological operation personnel's number of operations, to avoid causing the interruption of producing or even the parking of system because of manual operation.
For achieving the above object, the technical solution used in the present invention is:
A kind of powder coal gasification furnace security logic control method is characterized in that comprising following controlled step:
(1) operation
Before the startup gasification installation,, start the security system of gasification installation by the operation button;
(2) reset
Satisfy the condition that resets:
The oxygen cutting valve puts in place;
Coal dust trip valve, coal dust T-valve are closed and are put in place;
Fine coal feed pressure tank 〉=0.5MPa;
Security system nitrogen pressure PI001 〉=6.0MPa;
System pressure≤0.4MPa;
After above-mentioned condition satisfies, reset button is pressed in the watch-keeping cubicle, fine coal allows to open for batch can lower coal powder trip valve, operator can open the coal dust trip valve, set up the coal dust circulation, the magnetic valve annex of oxygen flow variable valve and fuel gas stream adjustable valve gets electric opening, and allows distributed control system DCS to make proportion integration differentiation PID and regulates operation;
(3) oxygen emptying
Security system affirmation coal dust trip valve, coal dust T-valve are closed and are put in place, and the oxygen cutting valve cuts out and puts in place.The oxygen emptying button is pressed in the watch-keeping cubicle, and the oxygen emptying valve is opened, and the oxygen cutting valve is opened, and operator can pass through the oxygen bypass valve after seeing that the oxygen emptying valve reaches the position, set up the oxygen emptying flow; Also can regulate and make oxygen emptying by the oxygen bypass valve; After oxygen cutting valve manual-lock button/button ignition switch was pressed, the oxygen cutting valve cut out automatically;
(4) igniting
Security system affirmation system reset is finished, and affirmation oxygen cutting valve, oxygen cutting valve are closed and put in place, and coal dust trip valve, coal dust T-valve are closed and put in place; The watch-keeping cubicle operator open the fuel gas stream adjustable valve;
Button ignition switch is pressed in the watch-keeping cubicle;
Instant triggering nitrogen purge valve is opened oxygen pipeline is purged, and begins out time-delay back nitrogen purge valve from nitrogen purge valve and closes automatically;
The high-energy electronic igniter discharge is pressed the back time-delay at button ignition switch, and before nitrogen purging finished, lighter for ignition began discharge; At this moment, flame detecting device should be able to detect flare up fire;
High-energy electronic igniter is started working, and after nitrogen purge valve nitrogen blew valve and reach the position, the steam trip valve was opened, and fuel gas is sent into vapourizing furnace;
Oxygen emptying valve, oxygen cutting valve, oxygen cutting valve interoperation, oxygen is sent into vapourizing furnace;
When an oxygen cutting valve was opened, the nitrogen plug valve was closed;
After the oxygen cutting valve began action, the oxygen emptying valve cut out, the oxygen cutting valve is opened and all should be put in place, otherwise system shutdown;
After high-energy electronic igniter stopped discharge, flame detector fire inspection interlocking switch interlocking came into operation;
Fuel gas/the oxygen proportion that comes into operation is regulated;
(5) coal dust operation
The condition of coal dust operation:
A. reset button is pressed;
B. the oxygen emptying valve close put in place, the oxygen cutting valve reaches the position;
C. big flow oxygen cutting valve closes and puts in place;
The watch-keeping cubicle operator open the oxygen flow variable valve.
Coal dust operation button is pressed in the watch-keeping cubicle, coal dust trip valve, coal dust T-valve interoperation, and coal dust enters vapourizing furnace; Coal dust trip valve, coal dust T-valve reach position back time-delay, open big flow oxygen cutting valve, see that the oxygen cutting valve reaches the position after, open the oxygen flow variable valve, regulate to increase entering the vapourizing furnace oxygen flow; When flow reaches requirement, gradually close control valve for small flows up to closing;
After coal dust operation button is pressed in the watch-keeping cubicle, utilize the positive rise of this button signal to trigger releasing low discharge oxygen flow interlocking, the vapourizing furnace level chain that comes into operation automatically, water wall discharge interlocking, burner cooling water flow interlocking, vapourizing furnace temperature out interlocking, vapourizing furnace and water wall pressure reduction interlocking automatically;
When reaching the position back time-delay low car of jumping of oxygen flow that comes into operation, the oxygen cutting valve interlocks; Coal dust trip valve, coal dust T-valve reach the position back time-delay low interlocking of pulverized coal flow that comes into operation;
(6) vapourizing furnace stops
After stop button was pressed or triggered parking, coal dust trip valve, coal dust T-valve, coal dust trip valve were closed in the coal dust pipeline; Oxygen cutting valve, oxygen cutting valve, oxygen flow variable valve are closed in the oxygen pipeline; Fuel gas trip valve time-delay closing in the vapour line; Trip valve fuel gas trip valve can cut out at any time by the pass of the fuel gas trip valve on panel button in the vapour line;
Behind the system shutdown, open oxygen channel blow down valve purge oxygen pipeline, drive the pulverized coal channel blow down valve after the time-delay coal dust pipeline is purged, close simultaneously behind the purging; When two oxygen cutting valves close put in place after, open the nitrogen plug valve;
Nitrogen purge valve and pulverized coal channel blow down valve must just allow to open during greater than 6.0MPa at high pressure nitrogen pressure P I001.
According to described powder coal gasification furnace security logic control method, it is characterized in that:
In described step (4) igniting:
Instant triggering nitrogen purge valve is opened oxygen pipeline is purged, and nitrogen purge valve is closed automatically after nitrogen purge valve begins out time-delay 12s;
The high-energy electronic igniter discharge is pressed back time-delay 5 seconds at button ignition switch, and before nitrogen purging finished, lighter for ignition began discharge, 17 seconds continuous discharge time; At this moment, flame detecting device should be able to detect flare up fire;
The high-energy electronic igniter 5s that starts working, and after nitrogen purge valve nitrogen blew valve and reach the position, the steam trip valve was opened, and fuel gas is sent into vapourizing furnace;
Describedly began to move 30 seconds at the oxygen cutting valve, the oxygen emptying valve cuts out, the oxygen cutting valve is opened and all should be put in place, otherwise system shutdown;
Described after high-energy electronic igniter stops discharge, flame detector fire inspection interlocking switch interlocking comes into operation; Flame detector has two, and its interlocking signal constitutes two and selects two logical organizations, and the jumping car time-delay in 8 seconds is set;
Described step (5) coal dust is in service:
Coal dust trip valve, coal dust T-valve 8 reach back, position time-delay 4 seconds, open big flow oxygen cutting valve;
When reaching the position back time-delay low car of jumping of oxygen flow that came into operation in 120 seconds, the oxygen cutting valve interlocks; Coal dust trip valve, coal dust T-valve reach the position back time-delay low interlocking of pulverized coal flow that came into operation in 30 seconds;
During described step (6) vapourizing furnace stops:
The time-delay of fuel gas trip valve was closed in 120 seconds in the vapour line;
Behind the system shutdown, open oxygen channel blow down valve purge oxygen pipeline, delay time and drive the pulverized coal channel blow down valve after 10 seconds the coal dust pipeline is purged, close simultaneously after 10 seconds; After two oxygen cutting valves (4), oxygen cutting valve are closed and put in place, open the nitrogen plug valve.
Security logic Controlling System of the present invention can realize the driving sequential control, when the process variable out-of-limit, the fault of mechanical means, when the fault of system own or the energy interrupt, the security logic Controlling System can be automatically (in case of necessity can manually) finishes predefined action, makes operator, process unit and environmental protection change safe condition over to.In order to ensure the security and the operability of system, the redundancy structure of special system inner sensor is set to three and gets two logics simultaneously, and design has, and can come into operation according to the time-delay of production practice demand adjustment interlocks and delay time jumps the car defencive function.
The present invention is in fine coal water wall gasification installation, utilize this security logic system to adopt the mode of operation of scan round to do logic judgement and control output to logical program, realized technical process logic control core, i.e. ignition phase, oxygen can not enter vapourizing furnace prior to fuel gas; Throw the coal stage, the oxygen of big flow can not enter vapourizing furnace prior to coal dust.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is PLC operation of the present invention, resets and the stop logical schematic.
Fig. 3 is that PLC reset condition of the present invention is confirmed logical schematic.
Fig. 4 is a PLC coal dust operation logic synoptic diagram of the present invention.
Fig. 5 is a PLC igniting logical schematic of the present invention.
Fig. 6 is that PLC oxygen of the present invention and coal dust trip valve close valve position affirmation logical schematic.
Fig. 7 is that PLC of the present invention resets and allows the valve event logical schematic.
Fig. 8 is a PLC oxygen emptying valve logical schematic of the present invention.
Fig. 9 is a PLC nitrogen purge valve logical schematic of the present invention.
Figure 10 is a PLC lighter for ignition logical schematic of the present invention.
Figure 11 is PLC oxygen cutting valve of the present invention and nitrogen envelope valve logical schematic.
Figure 12 is a PLC oxygen cutting valve XV001 logical schematic of the present invention.
Figure 13 is a PLC fuel gas trip valve logical schematic of the present invention.
Figure 14 is a PLC coal dust trip valve logical schematic of the present invention.
In the accompanying drawing:
1, oxygen flow variable valve FV001; 2, oxygen cutting valve XV001; 3, oxygen emptying valve XV004; 4, oxygen cutting valve XV003; 5, pulverized coal channel blow down valve XV011; 6, fine coal is given batch can; 7, coal dust trip valve XV009; 8, coal dust T-valve XV008; 9, coal dust trip valve XV007; 10, steam regulating valve; 11, fuel gas stream adjustable valve FV003; 12, fuel gas trip valve XV010; 13, vapourizing furnace; 14, oxygen channel blow down valve XV006; 15, nitrogen plug valve XV005; 16, oxygen cutting valve XV002; 17, oxygen bypass valve FV002; 18, high pressure nitrogen pressure P I001; 19, operation button p1; 20, stop button p2 (outside hard button); 21, oxygen flow 2/3; 22, pulverized coal flow 2/3; 23, the vapourizing furnace liquid level 2/2; 24, water wall flow and difference in flow 2/3; 25, burner cooling water flow and difference in flow 2/3; 26, interlayer pressure reduction 2/3; 27, outlet synthetic gas temperature 2/3; 28, reset button; 29, psh004; 30, psh001; 31, oxygen flow interlocking fs1002; 32, coal dust operation button p4; 33, psll008; 34, zsl_XV004; 35, zsh_XV002; 36, zsh_XV003; 37, zsl_XV001; 38, zsl_XV003; 39, zsh_XV006; 40, fire inspection interlocking switch sa001 (outside two knobs); 41, flame detecting device bi001a; 42, flame detecting device bi001b; 43, button ignition switch p5; 44, zsl_XV008,45, zsl_XV007; 46, zsl_XV002; 47, oxygen emptying button p6; 48, high-energy electronic igniter xc001; 49, zsh_XV008; 50, zsh_XV007; 51, XV001 X button p7; 52, zsh_XV004; 53, the fuel gas trip valve closes button p8.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments:
The present invention relates to a kind of powder coal gasification furnace security logic Controlling System, use the automatic control that realizes fine coal water wall vapourizing furnace start-stop car scheme.Be that a kind of fuel gas, oxygen and coal dust spray into the security logic Controlling System that vapourizing furnace prepares synthetic raw gas through nozzle.For setting up regime flow, fuel gas, oxygen are provided with blow-down pipe respectively, and coal dust is provided with circulation line.
Security logic Controlling System of the present invention is made of hardware system and software system.Its hardware system is a modular organization, be convenient to the expansion of I/O I/O, be formed by combining by central processor CPU, power module, I/O module, I/O interface, communication module and base plate, for improving the safe reliability of system, can adopt uninterrupted power supply (ups) Unity power supply, also can adopt the redundancy of effort mode of two-node cluster hot backup to master cpu and power module; Its software system are developed based on windows operating system, must provide unified configuration surroundings by international standard regulation (IEC 1131-3), the automatic control scheme of vapourizing furnace security logic Controlling System adopts functional block language FBD (FBD), LD (ladder diagram), sequential language SFC (order functional diagram), repertory IL and these five kinds of IEC Programming with Pascal Language of structured text ST to realize.
Follow the principle of design of Safety instrument system SIS design specifications, this security logic Controlling System is independent of program control system, independently finishes safety protection function.The security logic Controlling System carries MODBUS (RS-232)/ASCALL communication port, can carry out connected network communication with program control system, and realization event writes down and first fault alarm output deixis on program control system, can come the exactness of decision logic relation by the sequence of operation of checking performer (valve, portfire etc.) in the security logic Controlling System, first fault alarm output indication can make operator find out rapidly and accurately and trigger the reason of stopping, thereby makes correct processing.
The process variable of triggering system emergency of the present invention protection mainly contains: oxygen flow is low, pulverized coal flow is low, vapourizing furnace shock chamber liquid level is low, advance that the burner cooling water flow is low, turnover burner cooling water flow difference is high, advance that vapourizing furnace water wall flow is low, turnover gasifier water-cooling wall difference in flow is high, the water wall inside and outside differential pressure is high, output synthetic gas temperature height height, flame detection signal hang down and reach manual stop button.
The process variable of triggering system emergency protection all is provided with by-pass switch; can conveniently excise this process variable and report to the police interlocking to do corresponding maintenance processing when metering instrument equipment breaks down, this process variable interlocking again comes into operation after metering instrument equipment recovers works better.
The present invention comprises following controlled step as shown in the figure:
1, operation
Before the startup gasification installation,, start the security system of gasification installation by operation button 19 (p1).
2, reset
Satisfy the condition that resets:
Oxygen cutting valve 2 (XV001), oxygen cutting valve 16 (XV002), oxygen cutting valve 4 (XV003) are closed and are put in place;
Coal dust trip valve 9 (XV007), coal dust T-valve 8 (XV008) are closed and are put in place;
Fine coal is given batch can 6 pressure 〉=0.5MPa;
Security system nitrogen pressure PI001 〉=6.0MPa;
System pressure≤0.4MPa;
After above-mentioned condition satisfies, reset button 28 is pressed in the watch-keeping cubicle, fine coal allows to open for batch can lower coal powder trip valve 7 (XV009), operator can open coal dust trip valve 7 (XV009), set up the coal dust circulation, the magnetic valve annex of oxygen flow variable valve 1 (FV001) and fuel gas stream adjustable valve 11 (FV003) gets electric opening, and allows distributed control system DCS to make proportion integration differentiation PID and regulates operation.
3, oxygen emptying
Security system affirmation coal dust trip valve 9 (XV007), coal dust T-valve 8 (XV008) are closed and are put in place, and oxygen cutting valve 2 (XV001) cuts out and puts in place.Oxygen emptying button 47 (p6) is pressed in the watch-keeping cubicle, oxygen emptying valve 3 (XV004) is opened, and oxygen cutting valve 2 (XV001) is opened, and operator are after seeing that oxygen emptying valve 3 (XV004) reaches the position, can pass through oxygen bypass valve 17 (FV002), set up the oxygen emptying flow.Also can regulate and make oxygen emptying by oxygen bypass valve 17 (FV002).After oxygen cutting valve 2 (XV001) manual-lock button 51/ button ignition switch 43 was pressed, oxygen cutting valve 2 (XV001) cut out automatically.
4, igniting
Security system affirmation system reset is finished, and affirmation oxygen cutting valve 16 (XV002), oxygen cutting valve 4 (XV003) are closed and put in place, and coal dust trip valve 9 (XV007), coal dust T-valve 8 (XV008) are closed and put in place.The watch-keeping cubicle operator open fuel gas stream adjustable valve 11 (FV003).
Instant triggering nitrogen purge valve 14 (XV006) is opened oxygen pipeline is purged, and nitrogen purge valve 14 (XV006) is closed automatically after nitrogen purge valve 14 (XV006) begins out time-delay 12s.
High-energy electronic igniter 48 (lighter for ignition) discharge is pressed back time-delay 5 seconds at button ignition switch, and before nitrogen purging finished, lighter for ignition began discharge, 17 seconds continuous discharge time.At this moment, flame detecting device 41,42 should be able to detect flare up fire.
High-energy electronic igniter 48 (lighter for ignition) 5s that starts working, and after nitrogen purge valve 14 (XV006) nitrogen blew valve and reach the position, steam trip valve 12 (XV010) was opened (be fuel gas this moment in the steam-pipe), and fuel gas is sent into vapourizing furnace 13.
When an oxygen cutting valve 4 was opened, nitrogen plug valve 15 (XV005) was closed;
Began to move 30 seconds at oxygen cutting valve 4 (XV003), oxygen emptying valve 3 cuts out, oxygen cutting valve 16,4 is opened and all should be put in place, otherwise system shutdown.
After high-energy electronic igniter 48 (lighter for ignition) stopped discharge, flame detector fire inspection interlocking switch 40 (sa001) interlocking came into operation.Flame detector has two, and its interlocking signal constitutes two and selects two logical organizations, and the jumping car time-delay in 8 seconds is set.
Fuel gas/the oxygen proportion that comes into operation is regulated.
5, coal dust operation
The condition of coal dust operation:
A. reset button 28 is pressed;
B. oxygen emptying valve 3 (XV004) close put in place, oxygen cutting valve 16 (XV002), oxygen cutting valve 4 (XV003) reach the position;
C. big flow oxygen cutting valve 2 (XV001) closes and puts in place;
The watch-keeping cubicle operator open oxygen flow variable valve 1 (FV001).
Coal dust operation button 32 is pressed in the watch-keeping cubicle, coal dust trip valve 9 (XV007), coal dust T-valve 8 (XV008) interoperation, and coal dust enters vapourizing furnace 13; Coal dust trip valve 9 (XV007), coal dust T-valve 8 (XV008) reach back, position time-delay 4 seconds, open big flow oxygen cutting valve 2 (XV001), after seeing that oxygen cutting valve 2 (XV001) reaches the position, open oxygen flow variable valve 1 (FV001), regulate to increase entering the vapourizing furnace oxygen flow; When flow reaches requirement, gradually close control valve for small flows 17 (FV002) up to closing.
After coal dust operation button 32 is pressed in the watch-keeping cubicle, utilize the positive rise of this button signal to trigger releasing low discharge oxygen flow interlocking, the vapourizing furnace level chain that comes into operation automatically, water wall discharge interlocking, burner cooling water flow interlocking, vapourizing furnace temperature out interlocking, vapourizing furnace and water wall pressure reduction interlocking automatically.
When reaching the position back time-delay low car of jumping of oxygen flow that came into operation in 120 seconds, oxygen cutting valve 2 (XV001) interlocks; Coal dust trip valve 9 (XV007), coal dust T-valve 8 (XV008) reach the position back time-delay low interlocking of pulverized coal flow that came into operation in 30 seconds.
6, vapourizing furnace stops
After stop button 20 was pressed or triggered parking, coal dust trip valve 9 (XV007), coal dust T-valve 8 (XV008), coal dust trip valve 7 (XV009) were closed in the coal dust pipeline; Oxygen cutting valve 16 (XV002), oxygen cutting valve 4 (XV003), oxygen flow variable valve 1 (FV001) are closed in the oxygen pipeline; Fuel gas trip valve 12 (XV010) time-delay was closed in 120 seconds in the vapour line.Trip valve fuel gas trip valve 12 (XV010) can cut out at any time by the pass button 53 of the fuel gas trip valve on the panel (p8) in the vapour line.
Behind the system shutdown, open oxygen channel blow down valve 14 (XV006) purge oxygen pipeline, delay time and drive pulverized coal channel blow down valve 5 (XV011) after 10 seconds the coal dust pipeline is purged, close simultaneously after 10 seconds; After two oxygen cutting valves 4 (XV003), oxygen cutting valve 16 (XV002) are closed and put in place, open nitrogen plug valve 15 (XV005).
Nitrogen purge valve 14 (XV006) and pulverized coal channel blow down valve 5 (XV011) must just allow to open during greater than 6.0MPa at high pressure nitrogen pressure P I001.
Embodiment recited above is described preferred implementation of the present invention; be not that design of the present invention and protection domain are limited; under the prerequisite that does not break away from design concept of the present invention; common engineering technical personnel make technical scheme of the present invention in this area various modification and improvement all should fall into protection scope of the present invention.
Claims (2)
1, a kind of powder coal gasification furnace security logic control method is characterized in that comprising following controlled step:
(1) operation
Before the startup gasification installation,, start the security system of gasification installation by operation button (19);
(2) reset
Satisfy the condition that resets:
Oxygen cutting valve (2), oxygen cutting valve (16), oxygen cutting valve (4) are closed and are put in place;
Coal dust trip valve (9), coal dust T-valve (8) are closed and are put in place;
Fine coal is given batch can (6) pressure 〉=0.5MPa;
Security system nitrogen pressure PI001 〉=6.0MPa;
System pressure≤0.4MPa;
After above-mentioned condition satisfies, reset button (28) is pressed in the watch-keeping cubicle, fine coal allows to open for batch can lower coal powder trip valve (7), operator can open coal dust trip valve (7), set up the coal dust circulation, the magnetic valve annex of oxygen flow variable valve (1) and fuel gas stream adjustable valve (11) gets electric opening, and allows distributed control system DCS to make proportion integration differentiation PID and regulates operation;
(3) oxygen emptying
Security system affirmation coal dust trip valve (9), coal dust T-valve (8) are closed and are put in place, and oxygen cutting valve (2) cuts out and puts in place; Oxygen emptying button (47) is pressed in the watch-keeping cubicle, and oxygen emptying valve (3) is opened, and oxygen cutting valve (2) is opened, and operator can pass through oxygen bypass valve (17) after seeing that oxygen emptying valve (3) reaches the position, set up the oxygen emptying flow; Also can regulate and make oxygen emptying by oxygen bypass valve (17); After oxygen cutting valve (2) manual-lock button (51)/button ignition switch (43) was pressed, oxygen cutting valve (2) cut out automatically;
(4) igniting
Security system affirmation system reset is finished, and affirmation oxygen cutting valve (16), oxygen cutting valve (4) are closed and put in place, and coal dust trip valve (9), coal dust T-valve (8) are closed and put in place; The watch-keeping cubicle operator open fuel gas stream adjustable valve (11);
Button ignition switch (43) is pressed in the watch-keeping cubicle;
Instant triggering nitrogen purge valve (14) is opened oxygen pipeline is purged, and begins out time-delay back nitrogen purge valve (14) from nitrogen purge valve (14) and closes automatically;
High-energy electronic igniter (48) discharge is pressed the back time-delay at button ignition switch, and before nitrogen purging finished, lighter for ignition began discharge; At this moment, flame detecting device (41), (42) should be able to detect flare up fire;
High-energy electronic igniter (48) is started working, and after nitrogen purge valve (14) nitrogen blew valve and reach the position, steam trip valve (12) was opened, and fuel gas is sent into vapourizing furnace (13);
Oxygen emptying valve (3), oxygen cutting valve (16), oxygen cutting valve (4) interoperation, oxygen is sent into vapourizing furnace (13);
When an oxygen cutting valve (4) when opening, nitrogen plug valve (15) is closed;
After oxygen cutting valve (4) began action, oxygen emptying valve (3) cut out, oxygen cutting valve (16), (4) are opened and all should be put in place, otherwise system shutdown;
After high-energy electronic igniter (48) stopped discharge, flame detector fire inspection interlocking switch (40) interlocking came into operation;
Fuel gas/the oxygen proportion that comes into operation is regulated;
(5) coal dust operation
The condition of coal dust operation:
A. reset button (28) is pressed;
B. oxygen emptying valve (3) close put in place, oxygen cutting valve (16), oxygen cutting valve (4) reach the position;
C. big flow oxygen cutting valve (2) closes and puts in place;
The watch-keeping cubicle operator open oxygen flow variable valve (1).
Coal dust operation button (32) is pressed in the watch-keeping cubicle, coal dust trip valve (9), coal dust T-valve (8) interoperation, and coal dust enters vapourizing furnace (13); Coal dust trip valve (9), coal dust T-valve (8) reach position back time-delay, open big flow oxygen cutting valve (2), see that oxygen cutting valve (2) reaches the position after, open oxygen flow variable valve (1), regulate to increase entering the vapourizing furnace oxygen flow; When flow reaches requirement, gradually close control valve for small flows (17) up to closing;
After coal dust operation button (32) is pressed in the watch-keeping cubicle, utilize the positive rise of this button signal to trigger releasing low discharge oxygen flow interlocking, the vapourizing furnace level chain that comes into operation automatically, water wall discharge interlocking, burner cooling water flow interlocking, vapourizing furnace temperature out interlocking, vapourizing furnace and water wall pressure reduction interlocking automatically;
When reaching the position back time-delay low car of jumping of oxygen flow that comes into operation, oxygen cutting valve (2) interlocks; Coal dust trip valve (9), coal dust T-valve (8) reach the position back time-delay low interlocking of pulverized coal flow that comes into operation;
(6) vapourizing furnace stops
After stop button (20) was pressed or triggered parking, coal dust trip valve (9), coal dust T-valve (8), coal dust trip valve (7) were closed in the coal dust pipeline; Oxygen cutting valve (16), oxygen cutting valve (4), oxygen flow variable valve (1) are closed in the oxygen pipeline; Fuel gas trip valve (12) time-delay closing in the vapour line; Trip valve fuel gas trip valve (12) can cut out at any time by the pass button of the fuel gas trip valve on the panel (53) in the vapour line;
Behind the system shutdown, open oxygen channel blow down valve (14) purge oxygen pipeline, drive pulverized coal channel blow down valve (5) after the time-delay coal dust pipeline is purged, close simultaneously behind the purging; After two oxygen cutting valves (4), oxygen cutting valve (16) are closed and put in place, open nitrogen plug valve (15);
Nitrogen purge valve (14) and pulverized coal channel blow down valve (5) must just allow to open during greater than 6.0MPa at high pressure nitrogen pressure P I001.
2, powder coal gasification furnace security logic control method according to claim 1 is characterized in that:
In described step (4) igniting:
Instant triggering nitrogen purge valve (14) is opened oxygen pipeline is purged, and nitrogen purge valve (14) is closed automatically after nitrogen purge valve (14) begins out time-delay 12s;
High-energy electronic igniter (48) discharge is pressed back time-delay 5 seconds at button ignition switch, and before nitrogen purging finished, lighter for ignition began discharge, 17 seconds continuous discharge time; At this moment, flame detecting device (41), (42) should be able to detect flare up fire;
High-energy electronic igniter (48) 5s that starts working, and after nitrogen purge valve (14) nitrogen blew valve and reach the position, steam trip valve (12) was opened, and fuel gas is sent into vapourizing furnace (13);
Describedly began to move 30 seconds at oxygen cutting valve (4), oxygen emptying valve (3) cuts out, oxygen cutting valve (16), (4) are opened and all should be put in place, otherwise system shutdown;
Described after high-energy electronic igniter (48) stops discharge, flame detector fire inspection interlocking switch (40) interlocking comes into operation; Flame detector has two, and its interlocking signal constitutes two and selects two logical organizations, and the jumping car time-delay in 8 seconds is set;
Described step (5) coal dust is in service:
Coal dust trip valve (9), coal dust T-valve (8) reach back, position time-delay 4 seconds, open big flow oxygen cutting valve (2);
When reaching the position back time-delay low car of jumping of oxygen flow that came into operation in 120 seconds, oxygen cutting valve (2) interlocks; Coal dust trip valve (9), coal dust T-valve (8) reach the position back time-delay low interlocking of pulverized coal flow that came into operation in 30 seconds;
During described step (6) vapourizing furnace stops:
Fuel gas trip valve (12) time-delay was closed in 120 seconds in the vapour line;
Behind the system shutdown, open oxygen channel blow down valve (14) purge oxygen pipeline, delay time and drive pulverized coal channel blow down valve (5) after 10 seconds the coal dust pipeline is purged, close simultaneously after 10 seconds; After two oxygen cutting valves (4), oxygen cutting valve (16) are closed and put in place, open nitrogen plug valve (15).
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