CN104017607A - Shutdown control method for feeding system of coal gasifier - Google Patents
Shutdown control method for feeding system of coal gasifier Download PDFInfo
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- CN104017607A CN104017607A CN201410289601.9A CN201410289601A CN104017607A CN 104017607 A CN104017607 A CN 104017607A CN 201410289601 A CN201410289601 A CN 201410289601A CN 104017607 A CN104017607 A CN 104017607A
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Abstract
The invention provides a shutdown control method for a feeding system of a coal gasifier. The shutdown control method for a feeding system of a coal gasifier comprises the following steps: S1, stopping feeding oxygen and coal-water-slurry into a nozzle of a coal gasifier; S2, by using nitrogen, blowing oxygen in an oxygen pipeline to the inside of the coal gasifier by virtue of the nozzle; S3, keeping the oxygen pipeline in a blowing state, by using nitrogen, blowing coal-water-slurry in a coal-water-slurry pipeline to the inside of the coal gasifier by virtue of the nozzle, and after the coal-water-slurry pipeline is blown for a first scheduled time, stopping the blowing to the coal-water-slurry pipeline; S4, keeping the oxygen pipeline in a blowing state, enabling the pressure of the inside of the oxygen pipeline to be greater than the pressure of the inside of the coal gasifier, and after the oxygen pipeline is blown for a second scheduled time, stopping the blowing to the oxygen pipeline; S5, carrying out pressure relief on the coal gasifier. According to the invention, a flash-explosion phenomenon formed after pulverized coal particles carried in synthesis gas in a coal gasifier reversely enter the oxygen pipeline can be effectively avoided.
Description
Technical field
The present invention relates to coal water slurry gasification equipment technical field, more specifically, relate to a kind of coal gasifier feed system control method for stopping.
Background technology
Existing texaco coal gasification technology is a kind of very ripe and Coal Gasification Technology that safety performance is higher, but still exist the potential safety hazard of self, in the explosion hazard that coal gasification apparatus occurs, major part occurs in coal gasifier burner place, especially oxygen pipeline and burner junction.In existing technology, non-return valve in use for some time, there are wearing and tearing in spool, spring occurs tired, in often occurring, leaks, like this in docking process, high pressure nitrogen only maintains the purging to oxygen pipeline of short period, and after high pressure nitrogen purges and finishes, the pressure in vapourizing furnace still high synthetic gas carries pulverized coal particle and plays a reversed role into oxygen pipeline and be deposited on oxygen pipeline dead angle, while making again to drive to purge, these particles cannot blow off, and these particles contact very easily and set off an explosion with pure oxygen.In the time that these particles run up to a certain degree, when oxygen flow fluctuates in oxygen flow variation or normal production in startup procedure, make these inflammable particles bury the quick-fried potential safety hazard of sudden strain of a muscle because directly contacted with high speed oxygen by disturbance.
Summary of the invention
The present invention aims to provide a kind of coal gasifier feed system control method for stopping, to solve the high problem of coal gasifier feed system potential safety hazard of the prior art.
For solving the problems of the technologies described above, the invention provides a kind of coal gasifier feed system control method for stopping, this coal gasifier feed system control method for stopping, comprising: step S1: stop passing into oxygen and coal water slurry to the burner of coal gasifier; Step S2: utilize nitrogen that the oxygen in oxygen channel is purged to coal gasifier by burner; Step S3: keep the purging state to oxygen channel, and utilize nitrogen that the coal water slurry in water-coal-slurry pipeline is purged to coal gasifier by burner, water-coal-slurry pipeline was purged after first scheduled time, stop the purging to water-coal-slurry pipeline; Step S4: keep the purging state to oxygen channel, and make the pressure in oxygen channel be greater than the pressure in coal gasifier, oxygen channel was purged after second scheduled time, stop the purging to oxygen channel; Step S5: coal gasifier is carried out to pressure release.
Further, oxygen channel comprises the first tributary pipeline, and the first tributary pipeline is connected with burner, in step S4, makes the pressure in the first tributary pipeline be greater than the pressure in coal gasifier.
Further, oxygen channel comprises the second tributary pipeline, and the second tributary pipeline is connected with burner, in step S4, makes the pressure in the second tributary pipeline be greater than the pressure in coal gasifier.
Further, be provided with the first non-return valve and the first variable valve on the first tributary pipeline, the first non-return valve and the first variable valve are along setting gradually away from the direction of burner; On the first tributary pipeline, be also provided with the second pressure transmitter, the second pressure transmitter for detection of the first non-return valve to the pressure in the duct section between burner; On coal gasifier, be provided with the first pressure transmitter that detects the pressure in coal gasifier; In step S4, Controlling System regulates the aperture of the first variable valve automatically according to the magnitude relationship of force value of the first pressure transmitter and the detection of the second pressure transmitter and the pressure difference of setting, so that the first non-return valve is greater than the pressure in coal gasifier to the pressure in the duct section between burner.
Further, be provided with the second non-return valve and the second variable valve on the second tributary pipeline, the second non-return valve and the second variable valve are along setting gradually away from the direction of burner; On the second tributary pipeline, be also provided with the 3rd pressure transmitter, the 3rd pressure transmitter for detection of the second variable valve to the pressure in the duct section between burner; In step S4, Controlling System regulates the aperture of the second variable valve automatically according to the magnitude relationship of force value of the first pressure transmitter and the detection of the 3rd pressure transmitter and the pressure difference of setting, so that the second non-return valve is greater than the pressure in coal gasifier to the pressure in the duct section between burner.
Further, Controlling System comprises first arithmetic device, and first arithmetic device carries out computing to control the aperture of the first variable valve to the result of the first pressure transmitter and the detection of the second pressure transmitter.
Further, Controlling System comprises second arithmetic device, and second arithmetic device calculates to control the aperture of the second variable valve to the result of the first pressure transmitter and the detection of the 3rd pressure transmitter.
Further, in step S4, the first non-return valve to the pressure in the duct section between burner and the pressure difference in coal gasifier in the scope of 0.01MPa to 0.03MPa.
Further, in step S4, the second non-return valve to the pressure in the duct section between burner and the pressure difference in coal gasifier in the scope of 0.01MPa to 0.03MPa.
Further, in step S5, pressure release speed is less than 0.1MPa/min.
Further, coal gasifier feed system control method for stopping also comprises: step S6: after pressure release finishes, keep the first non-return valve to be greater than the pressure in coal gasifier to the pressure in the duct section between burner, and keep the second non-return valve to be greater than the pressure in coal gasifier to the pressure in the duct section between burner, until oxygen channel and water-coal-slurry pipeline are removed from burner.
Apply technical scheme of the present invention, coal gasifier feed system control method for stopping, comprising: step S1: stop passing into oxygen and coal water slurry to the burner of coal gasifier; Step S2: utilize nitrogen that the oxygen in oxygen channel is purged to coal gasifier by burner; Step S3: keep the purging state to oxygen channel, and utilize nitrogen that the coal water slurry in water-coal-slurry pipeline is purged to coal gasifier by burner, water-coal-slurry pipeline was purged after first scheduled time, stop the purging to water-coal-slurry pipeline; Step S4: keep the purging state to oxygen channel, and make the pressure in oxygen channel be greater than the pressure in coal gasifier, oxygen channel was purged after second scheduled time, stop the purging to oxygen channel; Step S5: coal gasifier is carried out to pressure release.According to the present invention, in whole docking process, because the pressure in oxygen channel is greater than the pressure in coal gasifier, can effectively avoid synthetic gas in coal gasifier to carry pulverized coal particle plays a reversed role and forms and dodge quick-fried phenomenon in oxygen channel, avoid too much coal ash to enter the burner of coal gasifier simultaneously, and in the inner adhesion of burner, make burner can keep for a long time its premium properties.
Brief description of the drawings
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 has schematically shown the annexation figure of coal gasifier feed system of the present invention; And
Fig. 2 has schematically shown the schema of the control method for stopping of coal gasifier feed system of the present invention.
Description of reference numerals:
10, water-coal-slurry pipeline; 11, the first control valve; 20, the first nitrogen pipeline; 21, the second control valve; 22, the 3rd non-return valve; 30, oxygen channel; 301, the first tributary pipeline; 302, the second tributary pipeline; 31, the 3rd control valve; 32, the 4th control valve; 33, the 5th control valve; 34, the 6th control valve; 35, the 4th pressure transmitter; 36, the first variable valve; 37, the first non-return valve; 38, the second variable valve; 39, the second non-return valve; 40, the second nitrogen pipeline; 401, the first nitrogen tributary pipeline; 402, the second nitrogen tributary pipeline; 403, the 3rd nitrogen tributary pipeline; 404, the 4th nitrogen tributary pipeline; 41, the 4th non-return valve; 42, the 7th control valve; 43, the 5th non-return valve; 44, the 8th control valve; 45, the 6th non-return valve; 46, the 9th control valve; 47, the tenth control valve; 48, the 7th non-return valve; 50, the 3rd nitrogen pipeline; 51, the 11 control valve; 61, the first pressure transmitter; 62, the second pressure transmitter; 63, the 3rd pressure transmitter; 70, burner; 81, first arithmetic device; 82, second arithmetic device.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Shown in Figure 1, the direction of arrow in figure represents the flow direction of ducted fluid.The coal gasifier feed system of applying parking method of the present invention specifically comprises:
Water-coal-slurry pipeline 10, this water-coal-slurry pipeline 10 is connected with the burner 70 of coal gasifier, is provided with the first control valve 11 on water-coal-slurry pipeline 10, and this first control valve 11 is controlled the break-make of water-coal-slurry pipeline; The first nitrogen pipeline 20, on this first nitrogen pipeline 20, be provided with the second control valve 21 and the 3rd non-return valve 22, wherein, the first nitrogen pipeline 20 is connected with water-coal-slurry pipeline 10, link position is positioned on the duct section that the exit end with the first control valve 11 of water-coal-slurry pipeline 10 is connected, and the 3rd non-return valve 22 is arranged on the duct section between link position and second control valve 21 of the first nitrogen pipeline 20 and water-coal-slurry pipeline 10.In the time that the first control valve 11 is closed, open the second control valve 21, in the first nitrogen pipeline 20, pass into high pressure nitrogen, just the water-coal-slurry pipeline in water-coal-slurry pipeline 10 can be purged to coal gasifier, the setting of the 3rd non-return valve 22 can avoid the fluid in water-coal-slurry pipeline 10 to be back in the first nitrogen pipeline 20.
Coal gasifier feed system also comprises oxygen channel 30, and this oxygen channel 30 comprises the first tributary pipeline 301 and the second tributary pipeline 302, and the first tributary pipeline 301 is all connected with burner 70 with the second tributary pipeline 302.To the pipeline of the shunting node of oxygen channel 30, be disposed with the 3rd control valve 31, the 4th control valve 32, the 5th control valve 33 from the opening for feed of oxygen channel 30.On the first tributary pipeline 301 of oxygen channel 30, once be provided with the 6th control valve 34, the first variable valve 36 and the first non-return valve 37 along the flow direction of oxygen, and being also provided with at the inlet end of the 6th control valve 34 pressure that the aperture of the 4th pressure transmitter 35, the six control valves 34 of the pressure size of the ingress of detecting the first tributary pipeline 301 detects according to the 4th pressure transmitter 35 controls.On the first tributary pipeline 301, be also provided with the second pressure transmitter 62 to the pressure size of the pipeline between burner 70 for detection of the first non-return valve 37, simultaneously, on burner 70, be provided with the first pressure transmitter 61 that detects the pressure size in coal gasifier, the first pressure transmitter 61 is all connected with the first arithmetic device 81 of Controlling System with the second pressure transmitter 62, and the result that first arithmetic device 81 detects the first pressure transmitter 61 and the second pressure transmitter 62 calculates to control the aperture of the first variable valve 36.On the second tributary pipeline 302, be disposed with the second variable valve 38 and the second non-return valve 39 along the flow direction of oxygen, the second non-return valve 39 is provided with the 3rd pressure transmitter 63 to the pipeline between burner 70, and the result that the second arithmetic device 82 of Controlling System detects the first pressure transmitter 61 and the 3rd pressure transmitter 63 calculates to control the aperture of the second variable valve 38.
Coal gasifier feed system also comprises the second nitrogen pipeline 40, the second nitrogen pipeline 40 comprises the first nitrogen tributary pipeline 401, the second nitrogen tributary pipeline 402, the 3rd nitrogen tributary pipeline 403 and the 4th nitrogen tributary pipeline 404, and these four tributary pipelines are all connected with oxygen channel 30, by the oxygen blow in oxygen channel 30 to coal gasifier.Wherein, the link position of the first nitrogen tributary pipeline 401 and oxygen channel 30, on the pipeline between the 3rd control valve 31 and the 4th control valve 32, and is disposed with the 7th control valve 42 and the 4th non-return valve 41 along the flow direction of nitrogen on the first nitrogen tributary pipeline 401; The link position of the second nitrogen tributary pipeline 402 and oxygen channel, on the pipeline between the 4th control valve 32 and the 5th control valve 33, and is disposed with the 8th control valve 44 and the 5th non-return valve 43 along the flow direction of nitrogen on the second nitrogen tributary pipeline 402; The 3rd nitrogen tributary pipeline 403 is connected with the second tributary pipeline 302, and the link position between them is positioned on the pipeline being connected with the entrance end of the second variable valve 38, and be disposed with the 9th control valve 46 and the 6th non-return valve 45 along the flow direction of nitrogen on the 3rd nitrogen tributary pipeline 403; The 4th nitrogen tributary pipeline 404 is connected with the first tributary pipeline 301, and their connection position is on the pipeline between the 6th control valve 34 and the first variable valve 36, and be disposed with the tenth control valve 47 and the 7th non-return valve 48 along the flow direction of nitrogen on the 4th nitrogen tributary pipeline 404.
Shown in Figure 2, according to embodiments of the invention, the utilization of coal gasifier feed system control method for stopping realizes on the basis of above-mentioned coal gasifier feed system, specifically comprises: step S1: stop passing into oxygen and coal water slurry to the burner of coal gasifier; Step S2: utilize nitrogen that the oxygen in oxygen channel is purged to coal gasifier by burner; Step S3: keep the purging state to oxygen channel, and utilize nitrogen that the coal water slurry in water-coal-slurry pipeline is purged to coal gasifier by burner, water-coal-slurry pipeline was purged after first scheduled time, stop the purging to water-coal-slurry pipeline; Step S4: keep the purging state to oxygen channel, and make the pressure in oxygen channel be greater than the pressure in coal gasifier, oxygen channel was purged after second scheduled time, stop the purging to oxygen channel; Step S5: coal gasifier is carried out to pressure release.According to embodiments of the invention, in whole docking process, because the pressure in oxygen channel 30 is greater than the pressure in vapourizing furnace, can effectively avoid synthetic gas in vapourizing furnace to carry pulverized coal particle plays a reversed role and forms and dodge quick-fried phenomenon in oxygen channel 30, avoid too much coal ash to enter burner in the inner adhesion of burner simultaneously, make its premium properties of maintenance of burner energy longer time.It should be noted that, said nitrogen in the present embodiment, its pressure is greater than the pressure of the oxygen in oxygen channel 30.In the present embodiment, the purging nitrogen in purging nitrogen and oxygen channel 30 that water-coal-slurry pipeline is 10 li is same source nitrogen, and pressure is equally high, is high pressure nitrogen, and generally we are called high pressure nitrogen by pressure higher than the nitrogen of 8.0MPa.
Illustrate the operating process of each step in conjunction with the coal gasifier feed system shown in Fig. 1.Before parking, the first control valve 11, the 3rd control valve 31, the 4th control valve 32, the 5th control valve 33, the 6th control valve 34, the first variable valve 36 and the second variable valve 38 are all in open mode, and all the other control valves are all in closing condition.
In step S1, close the first control valve 11, the 3rd control valve 31, stop the burner 70 of coal gasifier to pass into coal water slurry and oxygen, and then stop passing into coal water slurry and oxygen in coal gasifier.
Then carry out step S2, open the 7th control valve 42, the 8th control valve 44, the 9th control valve 46 and the tenth control valve 47, and pass into high pressure nitrogen in the second nitrogen pipeline 40, by the oxygen blow in oxygen channel 30 to coal gasifier.
Then carry out step S3, open the second control valve 21, in the first nitrogen pipeline 20, pass into high pressure nitrogen, utilize high pressure nitrogen to purge water-coal-slurry pipeline 10, coal water slurry in water-coal-slurry pipeline 10 is purged to coal gasifier, after keeping purging 12S, close the second control valve 21, now, coal water slurry in water-coal-slurry pipeline 10 is purged to coal gasifier completely, in other embodiments of the invention, can also adjust according to actual behaviour in service the purge time of water-coal-slurry pipeline 10, but the purge time of oxygen channel 30 must be longer than the purge time of water-coal-slurry pipeline 10.
Then carry out step S4, due in whole coal gasifier feed system, the position that potential safety hazard is the highest is positioned at the 3rd control valve 31 to burner 70 this section of oxygen channels, therefore as long as ensure that synthetic gas can not carry coal ash and play a reversed role to the first tributary pipeline 301 and the interior security that can ensure whole system of the second tributary pipeline 302 from coal gasifier.Therefore, in step S4, first make the pressure in the first tributary pipeline 301 be greater than the pressure in coal gasifier, ensure that the coal dust in coal gasifier can not played a reversed role to the first tributary pipeline 301.
Preferably, in the present embodiment, on the first tributary pipeline 301, be provided with the first non-return valve 37 and the first variable valve 36, the first variable valve 36, the first non-return valves 37 and the first variable valve 36 along setting gradually away from the direction of burner 70; On the first tributary pipeline 301, be also provided with the second pressure transmitter 62, the pressure in the duct section that this second pressure transmitter 62 arrives between burner 70 for detection of the first non-return valve 37; On vapourizing furnace, be provided with the first pressure transmitter 61 that detects the pressure in vapourizing furnace; In step S4, the magnitude relationship of force value that Controlling System detects according to the first pressure transmitter 61 and the second pressure transmitter 62 and the pressure difference of setting regulate the aperture of the first variable valve 36 automatically, so that the first non-return valve 37 is greater than the pressure in vapourizing furnace to the pressure in the duct section between burner 70, avoid the coal dust in coal gasifier to play a reversed role to the first tributary pipeline 301.
Preferably, Controlling System comprises first arithmetic device 81, the force value that this first arithmetic device 81 detects the first pressure transmitter 61 and the second pressure transmitter 62 is carried out computing, compare the first non-return valve 37 and arrive the pressure difference in the interior pressure of duct section and the vapourizing furnace between burner 70, and then the aperture of controlling the first variable valve 36 is greater than pressure in vapourizing furnace to ensure the first non-return valve 37 to pressure in the duct section between burner 70, avoid playing a reversed role of coal dust, improve the security of system.More preferably, in step S4, pressure in the duct section that the first non-return valve 37 arrives between burner 70 and the pressure difference in vapourizing furnace are in the scope of 0.01MPa to 0.03MPa, and the pressure in the duct section that the first non-return valve 37 arrives between burner 70 is than the high 0.01MPa to 0.03MPa of the pressure in coal gasifier.Avoid on the one hand coal dust in coal gasifier to play a reversed role and get back in oxygen channel, can also avoid on the other hand pressure difference excessive and produce potential safety hazard, in other embodiments of the invention, the value of pressure difference can also suitably change according to actual behaviour in service.
Coal gasifier feed system according to the present invention can be known, oxygen channel 30 comprises the second tributary pipeline 302, the second tributary pipeline 302 is connected with burner 70, in step S4, make the pressure in the second tributary pipeline 302 be greater than the pressure in coal gasifier, further improve the security of whole system.
Preferably, in the present embodiment, on the second tributary pipeline 302, be provided with the second non-return valve 39 and the second variable valve 38, the second non-return valves 39 and the second variable valve 38 along setting gradually away from the direction of burner 70; On the second tributary pipeline 302, be also provided with the 3rd pressure transmitter 63, the three pressure transmitters 63 for detection of the second variable valve 38 to the pressure in the duct section between burner 70; In step S4, the magnitude relationship of force value that Controlling System detects according to the first pressure transmitter 61 and the 3rd pressure transmitter 63 and the pressure difference of setting regulate the aperture of the second variable valve 38 automatically, so that the second non-return valve 39 is greater than the pressure in coal gasifier to the pressure in the duct section between burner 70, avoid the coal dust in coal gasifier to play a reversed role to the first tributary pipeline 301, the security that further improves whole system.
Preferably, Controlling System comprises second arithmetic device 82, the force value that second arithmetic device 82 detects the first pressure transmitter 61 and the 3rd pressure transmitter 63 is carried out computing, compare the second non-return valve 39 and arrive the pressure difference in the interior pressure of duct section and the coal gasifier between burner 70, and then the aperture of controlling the second variable valve 38 is greater than pressure in coal gasifier to ensure the second non-return valve 39 to pressure in the duct section between burner 70, avoid playing a reversed role of coal dust, improve the security of system.More preferably, in step S4, pressure difference in the duct section that the second non-return valve 39 arrives between burner 70 in pressure and gas Coalification furnace is in the scope of 0.01MPa to 0.03MPa, and the pressure in the duct section that the second non-return valve 39 arrives between burner 70 is than the high 0.01MPa to 0.03MPa of the pressure in coal gasifier.Avoid on the one hand coal dust in coal gasifier to play a reversed role and get back in oxygen channel, can also avoid on the other hand pressure difference excessive and produce potential safety hazard, in other embodiments of the invention, the value of pressure difference can also suitably change according to actual behaviour in service.
After keeping the operation 15S of step S4, close the 4th control valve 32, the 7th control valve 42, the 8th control valve 44, stop the purge to oxygen channel 30.
Then carry out step S5, burner 70 is carried out in pressure release operation pressure leak process, pressure release speed is less than 0.1MPa/min, avoids the too fast and inner parts structure in infringement coal gasifier of pressure release.Generally, when vapourizing furnace pressure is during lower than 0.4MPa, can be considered that pressure release finishes.After pressure release finishes, the 9th control valve 46 and the tenth control valve 47 are closed, and stop passing into high pressure nitrogen to oxygen channel 30.First arithmetic device 81 and second arithmetic device 82 continue to come into operation, the first variable valve 36 and the second variable valve 38 continue respectively by the operation result of first arithmetic device 81 and second arithmetic device 82, by Controlling System control aperture with regulate first and second non-return valve to the pressure difference in pressure in the duct section burner 70 and gas Coalification furnace in the scope of 0.01MPa to 0.03MPa.
After step S5, also comprise step S6: after pressure release finishes, keep the first non-return valve 37 to be greater than the pressure in coal gasifier to the pressure in the duct section between burner 70, and keep the second non-return valve 39 to be greater than the pressure in coal gasifier to the pressure in the duct section between burner 70, until oxygen channel 30 and water-coal-slurry pipeline 10 are removed from burner 70.Keeping the pressure in oxygen channel between first and second non-return valve and burner 70 is pressure-fired with respect to the pressure in coal gasifier, the furnace gas that prevents from gasifying carries that dust is played a reversed role or will in coal gasifier, be full of nitrogen, for using next time coal gasifier to carry out adequate preparation, avoiding drive next time is to occur dodging quick-fried phenomenon.Concrete operations are: after the 9th control valve 46 and the tenth control valve 47 are closed, open immediately the 11 control valve 51 on the 3rd nitrogen pipeline 50, switch to low-pressure nitrogen by high pressure nitrogen, continue to continue to pass into low-pressure nitrogen to oxygen channel, keep it to be full of nitrogen state, continue to keep the pressure in oxygen channel 30 to be greater than the pressure in coal gasifier, until oxygen channel 30 and water-coal-slurry pipeline 10 are removed from burner 70.Water-coal-slurry pipeline 10 and oxygen channel 30, after burner 70 splits out, after the flange port that oxygen channel is connected with burner is sealed, can be closed the 11 control valve 51 and stop passing into nitrogen.In the present embodiment, said low-pressure nitrogen is the nitrogen that pressure is less than 0.8MPa, ensures that between first and second non-return valve and burner 70, the pressure in oxygen channel is slightly larger than the pressure in coal gasifier, prevents that the coal dust that synthetic gas carries in vapourizing furnace from playing a reversed role.
From above description, can find out, the above embodiments of the present invention have realized following technique effect: apply coal gasifier feed system control method for stopping of the present invention and can effectively avoid synthetic gas in vapourizing furnace to carry pulverized coal particle playing a reversed role and form and dodge quick-fried phenomenon in oxygen channel, avoid too much coal ash to enter burner at the inner atomizing effect affecting after burner comes into operation again that adheres to of burner simultaneously, make its premium properties of maintenance of burner energy longer time.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a coal gasifier feed system control method for stopping, is characterized in that, comprising:
Step S1: the burner (70) stopping to coal gasifier passes into oxygen and coal water slurry;
Step S2: utilize nitrogen that the oxygen in oxygen channel (30) is purged to coal gasifier by described burner (70);
Step S3: keep the purging state to described oxygen channel (30), and utilize nitrogen that the coal water slurry in water-coal-slurry pipeline (10) is purged to described coal gasifier by described burner (70), described water-coal-slurry pipeline (10) was purged after first scheduled time, stop the purging to described water-coal-slurry pipeline (10);
Step S4: keep the purging state to described oxygen channel (30), and make the pressure in described oxygen channel (30) be greater than the pressure in described coal gasifier, described oxygen channel (30) was purged after second scheduled time, stop the purging to described oxygen channel (30);
Step S5: described coal gasifier is carried out to pressure release.
2. coal gasifier feed system control method for stopping according to claim 1, it is characterized in that, described oxygen channel (30) comprises the first tributary pipeline (301), described the first tributary pipeline (301) is connected with described burner (70), in described step S4, make the pressure in described the first tributary pipeline (301) be greater than the pressure in described coal gasifier.
3. coal gasifier feed system control method for stopping according to claim 2, it is characterized in that, described oxygen channel (30) comprises the second tributary pipeline (302), described the second tributary pipeline (302) is connected with described burner (70), in described step S4, make the pressure in described the second tributary pipeline (302) be greater than the pressure in described coal gasifier.
4. coal gasifier feed system control method for stopping according to claim 3, it is characterized in that, on described the first tributary pipeline (301), be provided with the first non-return valve (37) and the first variable valve (36), described the first non-return valve (37) and described the first variable valve (36) are along setting gradually away from the direction of described burner (70);
On described the first tributary pipeline (301), be also provided with the second pressure transmitter (62), described the second pressure transmitter (62) arrives the pressure in the duct section between described burner (70) for detection of the first non-return valve (37);
On described coal gasifier, be provided with the first pressure transmitter (61) that detects the pressure in described coal gasifier;
In described step S4, Controlling System regulates the aperture of described the first variable valve (36) automatically according to the magnitude relationship of force value of the first pressure transmitter (61) and the second pressure transmitter (62) detection and the pressure difference of setting, so that described the first non-return valve (37) is greater than the pressure in described coal gasifier to the pressure in the duct section between described burner (70).
5. coal gasifier feed system control method for stopping according to claim 4, it is characterized in that, on described the second tributary pipeline (302), be provided with the second non-return valve (39) and the second variable valve (38), described the second non-return valve (39) and described the second variable valve (38) are along setting gradually away from the direction of described burner (70);
On described the second tributary pipeline (302), be also provided with the 3rd pressure transmitter (63), described the 3rd pressure transmitter (63) arrives the pressure in the duct section between described burner (70) for detection of described the second variable valve (38);
In described step S4, described Controlling System regulates the aperture of described the second variable valve (38) automatically according to the magnitude relationship of force value of the first pressure transmitter (61) and the detection of the 3rd pressure transmitter (63) and the pressure difference of setting, so that described the second non-return valve (39) is greater than the pressure in described coal gasifier to the pressure in the duct section between described burner (70).
6. coal gasifier feed system control method for stopping according to claim 4, it is characterized in that, described Controlling System comprises first arithmetic device (81), and described first arithmetic device (81) calculates to control the aperture of described the first variable valve (36) to the result of described the first pressure transmitter (61) and described the second pressure transmitter (62) detection.
7. coal gasifier feed system control method for stopping according to claim 5, it is characterized in that, described Controlling System comprises second arithmetic device (82), and described second arithmetic device (82) calculates to control the aperture of described the second variable valve (38) to the result of described the first pressure transmitter (61) and described the 3rd pressure transmitter (63) detection.
8. coal gasifier feed system control method for stopping according to claim 4, it is characterized in that, in described step S4, described the first non-return valve (37) to the pressure in the duct section between described burner (70) and the pressure difference in described coal gasifier in the scope of 0.01MPa to 0.03MPa.
9. coal gasifier feed system control method for stopping according to claim 5, it is characterized in that, in described step S4, described the second non-return valve (39) to the pressure in the duct section between described burner (70) and the pressure difference in described coal gasifier in the scope of 0.01MPa to 0.03MPa.
10. coal gasifier feed system control method for stopping according to claim 1, is characterized in that, in described step S5, pressure release speed is less than 0.1MPa/min.
11. coal gasifier feed system control method for stoppings according to claim 5, it is characterized in that, described coal gasifier feed system control method for stopping also comprises: step S6: after pressure release finishes, keep described the first non-return valve (37) to be greater than the pressure in described coal gasifier to the pressure in the duct section between described burner (70), and keep described the second non-return valve (39) to be greater than the pressure in described coal gasifier to the pressure in the duct section between described burner (70), until described oxygen channel (30) and water-coal-slurry pipeline (10) are removed from described burner (70).
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| CN201410289601.9A CN104017607B (en) | 2014-06-24 | 2014-06-24 | Coal gasifier feed system control method for stopping |
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| CN201410289601.9A Active CN104017607B (en) | 2014-06-24 | 2014-06-24 | Coal gasifier feed system control method for stopping |
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Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee after: China Shenhua Energy Co.,Ltd. Patentee after: Guoneng Baotou Coal Chemical Co.,Ltd. Patentee after: CHINA SHENHUA COAL TO LIQUID AND CHEMICAL Co.,Ltd. Address before: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee before: China Shenhua Energy Co.,Ltd. Patentee before: SHENHUA BAOTOU COAL CHEMICAL Co.,Ltd. Patentee before: CHINA SHENHUA COAL TO LIQUID AND CHEMICAL Co.,Ltd. |
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