CN108822897B - Start-up burner control method capable of improving ignition success rate and achieving on-line start/stop - Google Patents
Start-up burner control method capable of improving ignition success rate and achieving on-line start/stop Download PDFInfo
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- CN108822897B CN108822897B CN201810554588.3A CN201810554588A CN108822897B CN 108822897 B CN108822897 B CN 108822897B CN 201810554588 A CN201810554588 A CN 201810554588A CN 108822897 B CN108822897 B CN 108822897B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 176
- 239000001301 oxygen Substances 0.000 claims abstract description 176
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 176
- 239000002737 fuel gas Substances 0.000 claims abstract description 120
- 230000001105 regulatory effect Effects 0.000 claims abstract description 73
- 238000002309 gasification Methods 0.000 claims abstract description 60
- 238000010926 purge Methods 0.000 claims abstract description 48
- 239000000446 fuel Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 42
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 16
- 239000001569 carbon dioxide Substances 0.000 claims description 16
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 8
- 229910001882 dioxygen Inorganic materials 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000003245 coal Substances 0.000 abstract description 12
- 230000001276 controlling effect Effects 0.000 abstract description 6
- 206010037544 Purging Diseases 0.000 description 23
- 238000005516 engineering process Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 2
- 238000004200 deflagration Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011335 coal coke Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/723—Controlling or regulating the gasification process
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention discloses a start-up burner control method capable of improving ignition success rate and realizing on-line start-up/shutdown, and belongs to the field of pulverized coal gasification. The method comprises the steps of calibrating an oxygen flow regulating valve and a fuel gas flow regulating valve according to the relation between the flow of oxygen entering a gasification furnace, the oxygen-fuel ratio and the pressure of the gasification furnace, controlling the distance between the gas and an ignition gun after the oxygen and the fuel gas exit burner are mixed when a start-up burner is started and put into use to be 1-2 cm, and simultaneously controlling the excess coefficient of the oxygen to be 2.0-3.0 when the initial stage is put into use; and controlling the oxygen excess coefficient of the start-up burner to be 0.8-0.9 when the high-pressure on-line feeding is carried out so as to improve the ignition success rate and realize on-line start/stop. Compared with the prior art, the control method avoids long-time replacement purging of the gasification device after the gasification furnace pulverized coal burner is stopped, and greatly saves the start-stop period of the gasification furnace.
Description
Technical Field
The invention relates to the field of pulverized coal gasification, in particular to a start-up burner control method capable of improving ignition success rate and realizing on-line start/stop.
Background
The coal gasification process is a process in which coal or coal coke reacts with a gasification agent (air, oxygen, steam, etc.) to generate clean gas fuels such as carbon oxides, hydrogen, methane, etc., and is a well-known core technology and tap technology of the modern coal chemical industry process, while a gasification furnace is a core in the coal gasification process technology. Although the entrained flow gasification technology is a coal gasification technology which is generally adopted in a large scale at present, the following technical problems to be improved or broken through still exist: firstly, for the pulverized coal pressurized gasification technology, how to ensure that a start-up burner is safely and smoothly ignited and put into use and a better combustion state is kept in the heating and boosting processes of a gasification furnace is a key technology which needs to be perfected in the start-up process of the whole gasification device; secondly, safe and smooth parking or driving of the start-up burner in the running state of the gasification furnace cannot be realized, the gasification device needs to enter long-time replacement purging after the gasification furnace pulverized coal burner is completely parked, the gasification furnace start-up program can be entered after the purging is qualified, and the defects of large manpower and material resource consumption, long parking period and the like exist.
Disclosure of Invention
The technical task of the invention is to provide a start-up burner control method which can improve the ignition success rate and can be started/stopped on line aiming at the defects of the prior art. The method can improve the ignition success rate of the start-up burner, ensure the safe and smooth use of the start-up burner, and effectively avoid the ignition failure of the start-up burner caused by overhigh or overlow oxygen-fuel ratio in the initial use stage.
The technical task of the invention is realized by the following modes: the start-up burner control method capable of improving ignition success rate and realizing on-line start/stop is characterized by comprising the following steps of:
when the start-up burner is started and put into operation, calibrating the oxygen flow regulating valve according to the oxygen flow entering the gasifier and the pressure curve of the gasifier, calibrating the fuel gas flow regulating valve according to the oxygen flow entering the gasifier, the oxygen-fuel ratio and the pressure curve of the gasifier, controlling the distance between the gas and an ignition gun after the oxygen and the fuel gas exit burner are mixed when the start-up burner is put into operation to be 1-2 cm, and simultaneously controlling the excess coefficient of the oxygen to be 2.0-3.0 when the initial stage is put into operation;
when the start-up burner is put into operation on line at high pressure, the oxygen flow regulating valve is calibrated according to the oxygen flow entering the gasification furnace and the pressure curve of the gasification furnace, the fuel gas flow regulating valve is calibrated according to the oxygen flow entering the gasification furnace, the oxygen combustion ratio and the pressure curve of the gasification furnace, and the excess oxygen coefficient is controlled to be 0.8-0.9 during putting into operation.
After the start-up burner is started and put into operation to finish the calibration of the fuel gas flow regulating valve and the calibration of the oxygen gas flow regulating valve, purging the fuel gas pipeline and the oxygen gas pipeline, then setting the fuel gas flow regulating valve and the oxygen gas flow regulating valve to the calibration valve positions, and entering an ignition stage. In the ignition stage, the ignition gun discharges before the fuel gas and the oxygen enter the furnace, the fuel gas purging is closed after the fuel gas is put into the furnace, and the oxygen purging is closed after the oxygen is put into the furnace.
And after the high pressure of the start-up burner is put on line to finish the calibration of the fuel gas flow regulating valve and the calibration of the oxygen gas flow regulating valve, entering an ignition stage. In the ignition stage, the fuel gas purging is closed after the fuel gas is put in, and the oxygen purging is closed after the oxygen is put in. When the high voltage is put into the ignition stage on line, the ignition gun does not act.
When the start-up burner is put into high pressure on line, the operating pressure of the gasification furnace is preferably 3.8-4.0 MPa, so that the gasification process is better adapted to pulverized coal, and the influence on production operation is avoided.
When the start-up burner is started and put into operation, the oxygen flow entering the gasification furnace and the pressure of the gasification furnace are in a linear relation: y ═ ax + b, where: y is the flow of oxygen into the gasifier; x is the gasifier pressure; a is 13-15; b is 100-120;
the oxygen-fuel ratio and the pressure of the gasification furnace are in a linear relationship:
when x is 0 to 10bar, y ' is a ' x + b '
When x is more than 10bar, y' is 0.8-1.3,
wherein: y ' is the oxygen-fuel ratio, x is the pressure of the gasification furnace, a ' is-0.3 to-0.2, and b ' is 3.0 to 3.3.
When the start-up burner is put in online under high pressure, the oxygen flow entering the gasification furnace and the pressure of the gasification furnace are in a linear relationship: y ═ ax + b, where: y is the flow of oxygen into the gasifier; x is the gasifier pressure; a is 13-15; b is 100-120;
the oxygen-fuel ratio and the pressure of the gasification furnace are in a linear relationship:
when x is 0 to 10bar, y ' is a ' x + b '
When x is more than 10bar, y' is 0.8-1.1,
wherein: y ' is the oxygen-fuel ratio, x is the pressure of the gasification furnace, a ' is-0.3 to-0.2, and b ' is 3.0 to 3.3.
Further, the high-pressure on-line shutdown process of the start-up burner comprises the following steps:
s1, opening fuel gas purging and oxygen purging, and closing an oxygen cut-off valve and a fuel gas cut-off valve;
s2, partially opening an oxygen flow regulating valve and a nitrogen flow regulating valve;
s3, emptying oxygen in the oxygen pipeline and fuel gas in the fuel gas pipeline;
and S4, closing the oxygen flow regulating valve and the nitrogen flow regulating valve.
In the step S2, the oxygen flow regulating valve and the nitrogen flow regulating valve are opened by 40-60%.
In order to better realize the control method, an oxygen first cut-off valve, an oxygen flow regulating valve, an oxygen second cut-off valve and an oxygen third cut-off valve can be sequentially arranged on an oxygen pipeline of the start-up burner, a first oxygen emptying point is arranged between the oxygen flow regulating valve and the oxygen second cut-off valve, a second oxygen emptying point is arranged between the oxygen second cut-off valve and the oxygen third cut-off valve, and a high-pressure nitrogen purging point is arranged between the oxygen third cut-off valve and the start-up burner;
a first fuel gas cut-off valve, a fuel gas flow regulating valve and a second fuel gas cut-off valve are sequentially arranged on a fuel gas pipeline of the start-up burner, a fuel gas emptying point is arranged between the fuel gas flow regulating valve and the second fuel gas cut-off valve, and a high-pressure carbon dioxide purging point is arranged between the second fuel gas cut-off valve and the start-up burner.
Preferably, a flow meter for oxygen calibration is arranged at the front end of the oxygen flow regulating valve of the oxygen pipeline, and an actual furnace entering flow meter is arranged at the rear end of the third oxygen cut-off valve; the front end of the fuel gas flow regulating valve of the fuel gas pipeline is provided with a fuel gas flowmeter.
The on-off time of each valve can be monitored, if any valve can not be switched in place within 2S, the program directly executes the shutdown step, and the safety of the ignition process of the start-up burner is ensured.
Compared with the prior art, the start-up burner control method capable of improving the ignition success rate and realizing on-line start/stop has the following outstanding beneficial effects:
before (one) nozzle high pressure drops into, mark oxygen flow and fuel gas flow, calculate the velocity of flow that goes out the nozzle under current pressure according to nozzle oxygen passageway and fuel gas passageway to the distance of control flame to the nozzle is within suitable range, ensures that the technology nozzle parks the back, and the nozzle of starting work can be in combustion state, avoids producing explosive gas mixture in the stove, arouses the interior deflagration of stove.
In the ignition stage, the ignition gun should discharge before the fuel gas and the oxygen enter the gasifier, so as to prevent the oxygen or the fuel gas from generating deflagration after entering the gasifier; and the fuel gas purging is closed after the fuel gas is put into the reactor, and the oxygen purging is closed after the oxygen is put into the reactor, so that the safety of the vehicle putting and the pressure-rise online putting can be further improved.
And (III) when the vehicle is stopped, the fuel gas pipeline and the oxygen pipeline can be ensured not to have any residual gas, the fuel gas, the oxygen and the start-up burner can be thoroughly cut off, and the safety and the stability of operation can be ensured.
And an actual furnace entering flow meter is arranged on the oxygen pipeline, so that the problem of low actual furnace entering oxygen flow possibly caused by two oxygen emptying points can be timely found and corrected.
Drawings
FIG. 1 is a schematic view of a pipeline structure of a burner control method for start-up operation of an embodiment;
FIG. 2 is a graph of oxygen flow versus gasifier pressure;
FIG. 3 is a graph of oxygen-fuel ratio versus gasifier pressure.
Detailed Description
The method for controlling a start-up burner capable of improving ignition success rate and performing on-line start/stop according to the present invention is described in detail below with reference to the accompanying drawings.
Example (b):
[ pipeline Structure ]
As shown in fig. 1, an oxygen first cut-off valve 1, an oxygen flow rate regulating valve 12, an oxygen second cut-off valve 2, and an oxygen third cut-off valve 3 are sequentially provided on an oxygen line of a start-up burner 19. A first oxygen emptying point (provided with an oxygen emptying valve 8) is arranged between the oxygen flow regulating valve and the 12 oxygen second stop valve 2. A second oxygen emptying point (provided with an oxygen emptying valve 9) is arranged between the second oxygen shut-off valve 2 and the third oxygen shut-off valve 3. A high-pressure nitrogen purging point (a high-pressure nitrogen purging cut-off valve 6 is arranged on a pipeline of the high-pressure nitrogen purging point) is arranged between the third oxygen cut-off valve 3 and the start-up burner 19.
A first fuel gas shut-off valve 4, a fuel gas flow regulating valve 13 and a second fuel gas shut-off valve 5 are sequentially arranged on a fuel gas pipeline of the start-up burner 19. A fuel gas emptying point (provided with a fuel gas emptying valve 10 and a fuel gas emptying valve 11) is arranged between the fuel gas flow regulating valve 13 and the fuel gas second cut-off valve 5. A high-pressure carbon dioxide purging point (a high-pressure carbon dioxide purging cut-off valve 7 is arranged on a pipeline of the high-pressure carbon dioxide purging point) is arranged between the second cut-off valve 5 of the fuel gas and the start-up burner 19.
The oxygen pipeline, the fuel gas pipeline, the nitrogen pipeline and the carbon dioxide pipeline are respectively provided with a flowmeter 14 for oxygen calibration, an actual furnace entering quantity flowmeter 15, a fuel gas flowmeter 16, a nitrogen flowmeter 17 and a CO flowmeter2 A flow meter 18.
[ CONTROL METHOD ]
Start-up burner start-up scheme
1. Closing an oxygen first cut-off valve 1, an oxygen second cut-off valve 2, an oxygen third cut-off valve 3, a fuel gas first cut-off valve 4, a fuel gas second cut-off valve 5, a high-pressure nitrogen purging cut-off valve 6, a high-pressure carbon dioxide purging cut-off valve 7, an oxygen flow regulating valve 12 and a fuel gas flow regulating valve 13; and opening an oxygen emptying valve 8, an oxygen emptying valve 9, a fuel gas emptying valve 10 and a fuel gas emptying valve 11. The start-up procedure of the start-up burner enters a calibration stage
2. Opening the first oxygen cut-off valve 1, obtaining the target flow of the oxygen flow regulating valve 12 according to the curve (shown in figure 2) of the flow of the oxygen entering the gasification furnace and the pressure of the gasification furnace, automatically putting the oxygen flow controller into operation, regulating the flow of the oxygen, recording the opening degree of the current oxygen flow regulating valve 12 when the deviation of the flow of the oxygen and the target flow is +/-1%, and taking the opening degree as the target valve position when the start-up burner is put into operation.
3. Opening a first cut-off valve 4 of the fuel gas, obtaining the target flow of a fuel gas flow regulating valve 13 according to the oxygen flow, the oxygen-fuel ratio and the pressure curve of the gasification furnace (as shown in figure 3), putting a fuel gas flow controller into cascade, adjusting the fuel gas flow, recording the opening of the current fuel gas flow regulating valve 13 when the deviation of the fuel gas flow and the target flow is +/-1%, and taking the current opening as the target valve position when the start-up burner is put into operation.
The oxygen flow into the gasifier is in a linear relationship with the gasifier pressure (as shown in figure 2):
y＝13.4x+116
y is the flow rate of oxygen (unit: Nm) into the gasifier3/h)；
And x is the gasifier pressure (unit: bar).
The oxygen-fuel ratio is in linear relation with the gasifier pressure (as shown in figure 3):
when x is 0-10 bar, y' is-0.25 x + 3.3;
when x is more than 10bar, y' is 0.8,
y' is the oxygen-fuel ratio;
and x is the gasifier pressure (unit: bar).
4. Closing a fuel gas first cut-off valve 4, an oxygen flow regulating valve 12, a fuel gas flow regulating valve 13, an oxygen blow-down valve 8, a fuel gas blow-down valve 10 and a fuel gas blow-down valve 11; opening a fuel gas pipeline high-pressure carbon dioxide purging cut-off valve 7 and an oxygen pipeline high-pressure nitrogen purging cut-off valve 6, wherein the purging time is 120S, and the carbon dioxide flow is 300-350 Nm3The flow rate of clean nitrogen is 90-120 Nm3H is used as the reference value. And the start-up procedure of the start-up burner enters a purging stage.
5. After the "purging" time is completed, the oxygen vent valve 9 is closed, the program sets the oxygen flow regulating valve 12 to the calibration valve position, sets the fuel gas flow regulating valve 13 to the calibration valve position, and the ignition gun starts to discharge. The start-up burner enters an ignition stage.
6. And after the program monitors that the ignition gun discharges, the second oxygen cut-off valve 2 and the second fuel gas cut-off valve 5 are opened.
7. And after the program monitors that the second oxygen cut-off valve 2 and the second fuel gas cut-off valve 5 are opened, closing the high-pressure carbon dioxide purging cut-off valve 7.
8. After the program monitors that the high-pressure carbon dioxide purging cut-off valve 7 is closed, the third oxygen cut-off valve 3 is opened.
9. When the program monitors that the third oxygen shut-off valve 3 is opened, the high-pressure nitrogen purging shut-off valve 6 is closed, and the start-up burner is ignited.
10. After a program monitors a flame signal monitored by a flame monitor assembled on a start-up burner, an oxygen flow controller and a fuel gas flow controller are put into cascade connection, the oxygen flow controller tracks the pressure of the gasification furnace, the oxygen flow is adjusted according to an oxygen flow and gasification furnace pressure curve (shown in an attached figure 2), the fuel gas flow controller adjusts the fuel gas flow according to an oxygen-fuel ratio and gasification furnace pressure curve (shown in an attached figure 3), and the start-up burner enters a load-up stage and a running stage.
And 6-10, monitoring the opening and closing time of each valve by a program, and if the valves cannot be opened and closed in place within 2S, directly executing a stopping step by the program to ensure the safety of the ignition process of the start-up burner.
(II) when the gasification furnace is in operation, high-pressure on-line start-up burner
1. When the gasification furnace operates (the pressure is 3.8-4.0 MPa), the program determines that the high-pressure nitrogen purging cut-off valve 6 and the high-pressure carbon dioxide purging cut-off valve 7 are in an open state, and the start-up burner flame detector monitors a flame signal.
2. Opening the first oxygen cut-off valve 1, obtaining the target flow of the oxygen flow regulating valve 12 according to the curve (shown in figure 2) of the flow of the oxygen entering the gasification furnace and the pressure of the gasification furnace, automatically putting the oxygen flow controller into operation, regulating the flow of the oxygen, recording the opening degree of the current oxygen flow regulating valve 12 when the deviation of the flow of the oxygen and the target flow is +/-1%, and taking the opening degree as the target valve position when the start-up burner is put into operation.
3. And opening a first cut-off valve 4 of the fuel gas, obtaining the target flow of the fuel gas flow regulating valve 13 according to the oxygen flow, the oxygen-fuel ratio and the pressure curve of the gasification furnace, putting the fuel gas flow controller into cascade, regulating the fuel gas flow, and recording the opening of the current fuel gas flow regulating valve 13 when the deviation of the fuel gas flow and the target flow is +/-1 percent to be used as a target valve position when the start-up burner is put into operation.
The relation curve of the oxygen flow rate and the oxygen-fuel ratio of the gasification furnace and the pressure of the gasification furnace is the same as the start-up scheme of the start-up burner.
4. A first fuel gas cut-off valve 4, an oxygen flow regulating valve and 12, a fuel gas flow regulating valve 13, an oxygen blow-down valve 8, a fuel gas blow-down valve 10 and a fuel gas blow-down valve 11.
5. And when the flame signal is monitored, the second oxygen cut-off valve 2 and the second fuel gas cut-off valve 5 are opened.
6. And after the program monitors that the second oxygen cut-off valve 2 and the second fuel gas cut-off valve 5 are opened, closing the high-pressure carbon dioxide purging cut-off valve 7.
8. After the program monitors that the high-pressure carbon dioxide purging cut-off valve 7 is closed, the third oxygen cut-off valve 3 is opened.
9. When the program monitors that the third oxygen shut-off valve 3 is opened, the high-pressure nitrogen purging shut-off valve 6 is closed, and the start-up burner is ignited on line.
High-pressure on-line safe stopping method for (III) start-up burner
1. When the start-up burner is determined to stop, the program triggers a stop interlock, opens the high-pressure nitrogen purging cut-off valve 6 and the high-pressure carbon dioxide purging cut-off valve 7, closes the first oxygen shut-off valve 1, the second oxygen shut-off valve 2 and the third oxygen shut-off valve 3, and closes the first fuel gas shut-off valve 4 and the second fuel gas shut-off valve 5.
2. When the program monitors that the high-pressure nitrogen purging cut-off valve 6 and the high-pressure carbon dioxide purging cut-off valve 7 are opened, the first oxygen shut-off valve 1, the second oxygen shut-off valve 2 and the third oxygen shut-off valve 3 are closed, and after the first fuel gas shut-off valve 4 and the second fuel gas shut-off valve 5 are closed, the programs of the oxygen flow regulating valve 12 and the fuel gas flow regulating valve 13 are set to be 50%.
3. The program opens oxygen blow-down valves 8, 9 and fuel gas blow-down valves 10, 11.
4. The program monitors that the oxygen emptying valves 8 and 9 and the fuel gas emptying valves 10 and 11 are opened for one minute, and then the oxygen flow regulating valve 12 and the fuel gas flow regulating valve are closed. And (5) stopping the start-up burner.
Claims (8)
1. A start-up burner control method capable of improving ignition success rate and achieving on-line start/stop is characterized by comprising the following steps:
when the start-up burner is started and put into operation, the oxygen flow regulating valve is calibrated according to the oxygen flow entering the gasifier and the pressure curve of the gasifier, the fuel gas flow regulating valve is calibrated according to the oxygen flow entering the gasifier, the oxygen-fuel ratio and the pressure curve of the gasifier, the distance between the gas and an ignition gun after the oxygen and the fuel gas are mixed out of the burner is controlled to be 1-2 cm when the start-up burner is put into operation, and the excess coefficient of the oxygen is controlled to be 2.0-3.0 when the initial stage of the operation is put into operation,
when the start-up burner is started and put into operation, the oxygen flow entering the gasification furnace and the pressure of the gasification furnace are in a linear relation:
y＝ax+b，
wherein: y is the flow of oxygen into the gasifier; x is the gasifier pressure; a is 13-15; b is 100-120;
the oxygen-fuel ratio and the pressure of the gasification furnace are in a linear relationship:
when x is 0 to 10bar, y ' is a ' x + b '
When x is more than 10bar, y' is 0.8-1.3,
wherein: y ' is the oxygen-fuel ratio, x is the pressure of the gasification furnace, a ' is-0.3 to-0.2, and b ' is 3.0 to 3.3;
when the start-up burner is put in on line at high pressure, the oxygen flow regulating valve is calibrated according to the curve of the oxygen flow entering the gasification furnace and the pressure of the gasification furnace, the fuel gas flow regulating valve is calibrated according to the curve of the oxygen flow entering the gasification furnace, the oxygen combustion ratio and the pressure of the gasification furnace, the excess oxygen coefficient is controlled to be 0.8-0.9 when the start-up burner is put in,
when the start-up burner is put in online under high pressure, the oxygen flow entering the gasification furnace and the pressure of the gasification furnace are in a linear relationship:
y＝ax+b，
wherein: y is the flow of oxygen into the gasifier; x is the gasifier pressure; a is 13-15; b is 100-120;
the oxygen-fuel ratio and the pressure of the gasification furnace are in a linear relationship:
when x is 0 to 10bar, y ' is a ' x + b '
When x is more than 10bar, y' is 0.8-1.1,
wherein: y ' is the oxygen-fuel ratio, x is the pressure of the gasification furnace, a ' is-0.3 to-0.2, and b ' is 3.0 to 3.3.
2. The startup burner control method capable of improving the ignition success rate and achieving on-line startup/shutdown according to claim 1, characterized in that: after the start-up burner is started and put into operation to finish the calibration of the fuel gas flow regulating valve and the calibration of the oxygen gas flow regulating valve, purging the fuel gas pipeline and the oxygen gas pipeline, setting the fuel gas flow regulating valve and the oxygen gas flow regulating valve to calibration valve positions, and entering an ignition stage;
in the ignition stage, the ignition gun discharges before the fuel gas and the oxygen enter the furnace, the fuel gas purging is closed after the fuel gas is put into the furnace, and the oxygen purging is closed after the oxygen is put into the furnace.
3. The startup burner control method capable of improving the ignition success rate and achieving on-line startup/shutdown according to claim 1, characterized in that: after the high pressure of the start-up burner is put on line to finish the calibration of the fuel gas flow regulating valve and the calibration of the oxygen gas flow regulating valve, entering an ignition stage;
in the ignition stage, the fuel gas purging is closed after the fuel gas is put in, and the oxygen purging is closed after the oxygen is put in.
4. The startup burner control method capable of improving the ignition success rate and achieving on-line startup/shutdown according to claim 1 or 3, characterized in that: when the start-up burner is put into high pressure on line, the operating pressure of the gasification furnace is 3.8-4.0 MPa.
5. The start-up burner control method capable of improving the ignition success rate and achieving on-line start/stop according to claim 1, 2 or 3, wherein the on-line stop of the high pressure of the start-up burner comprises the following steps:
s1, opening fuel gas purging and oxygen purging, and closing an oxygen cut-off valve and a fuel gas cut-off valve;
s2, partially opening an oxygen flow regulating valve and a nitrogen flow regulating valve;
s3, emptying oxygen in the oxygen pipeline and fuel gas in the fuel gas pipeline;
and S4, closing the oxygen flow regulating valve and the nitrogen flow regulating valve.
6. The startup burner control method capable of improving the ignition success rate and achieving on-line startup/shutdown according to claim 5, characterized in that: in step S2 of the start-up burner high-pressure on-line stop, the oxygen flow regulating valve and the nitrogen flow regulating valve are opened by 40-60%.
7. The startup burner control method capable of improving the ignition success rate and achieving on-line startup/shutdown according to claim 5, characterized in that:
an oxygen first cut-off valve, an oxygen flow regulating valve, an oxygen second cut-off valve and an oxygen third cut-off valve are sequentially arranged on an oxygen pipeline of the start-up burner, a first oxygen emptying point is arranged between the oxygen flow regulating valve and the oxygen second cut-off valve, a second oxygen emptying point is arranged between the oxygen second cut-off valve and the oxygen third cut-off valve, and a high-pressure nitrogen purging point is arranged between the oxygen third cut-off valve and the start-up burner;
a first fuel gas cut-off valve, a fuel gas flow regulating valve and a second fuel gas cut-off valve are sequentially arranged on a fuel gas pipeline of the start-up burner, a fuel gas emptying point is arranged between the fuel gas flow regulating valve and the second fuel gas cut-off valve, and a high-pressure carbon dioxide purging point is arranged between the second fuel gas cut-off valve and the start-up burner.
8. The startup burner control method capable of improving the ignition success rate and achieving on-line startup/shutdown according to claim 7, characterized in that:
the front end of the oxygen pipeline oxygen flow regulating valve is provided with a flow meter for oxygen calibration, and the rear end of the third oxygen cut-off valve is provided with an actual furnace entering flow meter;
the front end of the fuel gas flow regulating valve of the fuel gas pipeline is provided with a fuel gas flowmeter.
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| CN102287851A (en) * | 2011-07-13 | 2011-12-21 | 上海先进半导体制造股份有限公司 | Ignition method of furnace tube |
| CN102618332A (en) * | 2011-12-23 | 2012-08-01 | 航天长征化学工程股份有限公司 | Starting/stopping control method and system for powdered coal pressure gasification device |
| CN104479759B (en) * | 2014-12-19 | 2016-09-07 | 刘晓军 | A kind of method improving gasifier to start working burner ignition success rate |
| CN106350119A (en) * | 2016-08-29 | 2017-01-25 | 中国天辰工程有限公司 | Coal oxygen conveying control method and device for coal gasification plant |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287851A (en) * | 2011-07-13 | 2011-12-21 | 上海先进半导体制造股份有限公司 | Ignition method of furnace tube |
| CN102618332A (en) * | 2011-12-23 | 2012-08-01 | 航天长征化学工程股份有限公司 | Starting/stopping control method and system for powdered coal pressure gasification device |
| CN104479759B (en) * | 2014-12-19 | 2016-09-07 | 刘晓军 | A kind of method improving gasifier to start working burner ignition success rate |
| CN106350119A (en) * | 2016-08-29 | 2017-01-25 | 中国天辰工程有限公司 | Coal oxygen conveying control method and device for coal gasification plant |
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