CN214891142U - Device for preventing circulating fluidized bed boiler from coking - Google Patents
Device for preventing circulating fluidized bed boiler from coking Download PDFInfo
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- CN214891142U CN214891142U CN202120737617.7U CN202120737617U CN214891142U CN 214891142 U CN214891142 U CN 214891142U CN 202120737617 U CN202120737617 U CN 202120737617U CN 214891142 U CN214891142 U CN 214891142U
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- fluidized bed
- pipe
- coking
- limestone
- air
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- 238000004939 coking Methods 0.000 title claims abstract description 42
- 238000009826 distribution Methods 0.000 claims abstract description 48
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003245 coal Substances 0.000 claims abstract description 39
- 235000019738 Limestone Nutrition 0.000 claims abstract description 34
- 239000006028 limestone Substances 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 25
- 239000000428 dust Substances 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 238000010926 purge Methods 0.000 claims description 18
- 230000002265 prevention Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 34
- 238000002485 combustion reaction Methods 0.000 description 23
- 239000007787 solid Substances 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000010883 coal ash Substances 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 238000005243 fluidization Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002956 ash Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model provides a device for preventing a circulating fluidized bed boiler from coking, belonging to the field of power generation equipment; including the fluidized bed, the fluidized bed is equipped with interlocking controller, the fluidized bed is equipped with the air hose, the air hose is equipped with the nitrogen gas pipe, the fluidized bed is equipped with the water-cooling wall, the water-cooling wall is connected with the steam pocket, the steam pocket passes through the tube coupling and returns the water-cooling wall, the steam pocket is equipped with the steam outlet pipe, the fluidized bed is equipped with coal grain inlet pipe and limestone inlet pipe, the coal grain inlet pipe is connected with the coal grain storehouse, the limestone inlet pipe is equipped with the limestone storehouse, the fluidized bed is equipped with secondary air pipe and outlet pipe, the outlet pipe is connected with cyclone, cyclone is equipped with whirlwind outlet pipe and feed back pipe, feed back pipe one end is connected to in the fluidized bed. The utility model discloses an interlocking automatic control anti-coking device, the control fluidized bed internal temperature is stable, prevents the coking, adopts novel fluidized bed air distributor simultaneously, makes fluidized bed gas distribution more even, prevents that the cap that distributes from blockking up and arousing that local temperature is too high to produce the coking.
Description
Technical Field
The utility model provides a device of prevention circulating fluidized bed boiler coking belongs to the power generation equipment field.
Background
The Circulating Fluidized Bed (CFB) boiler technology is a high-efficiency low-pollution clean combustion technology which is rapidly developed in recent ten years and is widely applied to the field of power plant boilers. The circulating fluidized bed boiler has the advantages that: the fuel adaptability is wide; the combustion is stable and efficient; the environmental protection performance is superior; the fuel preparation system is simple and the load regulation performance is good. However, due to the inherent characteristics, technical problems still often occur in the operation, and coking is a common fault in the operation of the circulating fluidized bed boiler and directly influences the safe and economic operation of the boiler. The coking is divided into high-temperature coking and low-temperature coking, wherein the high-temperature coking is caused by that the bed material is burnt abnormally and violently and the temperature rises sharply in the operation process, and the high-temperature coking can occur when the temperature exceeds the melting temperature of ash; the low-temperature coking is caused by that the local material reaches the ignition temperature due to poor fluidization, but the air quantity at the time is enough to fully combust the material, but the material cannot be fully boiled and moved, so that the temperature of the local material is too high to exceed the ash melting point, and the coking can occur if the local material is not treated in time.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device of prevention circulating fluidized bed boiler coking adopts the anti-coking device of interlocking automatic control, and the temperature is stable in the control fluidized bed, prevents the coking, adopts novel fluidized bed air distributor simultaneously, makes fluidized bed gas distribution more even, prevents that the cap that distributes from blockking up and arousing that local temperature is too high to produce the coking.
The utility model provides a device of prevention circulating fluidized bed boiler coking, its characterized in that: including the fluidized bed, the fluidized bed outside is equipped with interlocking controller, the fluidized bed bottom is equipped with the air hose, the air hose is equipped with the nitrogen pipe, the fluidized bed outside is equipped with the water-cooled wall, the water-cooled wall has the steam pocket through the tube coupling, the steam pocket bottom returns the water-cooled wall through the tube coupling, steam pocket upper portion is equipped with the steam outlet pipe, the fluidized bed side is equipped with coal grain inlet pipe and lime stone inlet pipe, the coal grain inlet pipe is connected with the coal grain storehouse, the lime stone inlet pipe is equipped with the limestone storehouse, the fluidized bed side is equipped with the secondary air pipe, the fluidized bed top is equipped with the outlet pipe, outlet pipe one end is connected with cyclone, the cyclone top is equipped with the cyclone outlet pipe, the cyclone bottom is equipped with the feed back pipe, feed back pipe one end is connected to in the fluidized bed.
The dust removal device is characterized in that the material return pipe is provided with a material return valve, the bottom of the material return valve is connected with a dust exhaust pipe, the dust exhaust pipe is provided with a dust exhaust valve, the side face of the dust exhaust pipe is provided with a purging pipe, the tail end of the purging pipe is connected to a primary air pipe, and the purging pipe is provided with a purging electromagnetic valve.
The coal particle feeding pipe is provided with a coal particle feeding electromagnetic valve, the limestone feeding pipe is provided with a limestone feeding electromagnetic valve, and the coal particle feeding electromagnetic valve and the limestone feeding electromagnetic valve are electrically connected with the interlocking controller.
The nitrogen pipe is provided with a nitrogen solenoid valve, and the nitrogen solenoid valve is electrically connected with the interlocking controller.
The fluidized bed is characterized in that a first thermometer is arranged in the middle of the fluidized bed, a second thermometer is arranged at the top of the fluidized bed, a differential pressure gauge is arranged on the side face of the fluidized bed, and the second thermometer is electrically connected with the interlocking controller.
The air distribution plate is arranged at the bottom of the fluidized bed and provided with an air distribution cap and an air passing hole, the air passing hole penetrates through the air distribution plate, the air distribution cap is located above the air passing hole and fixedly connected to the air distribution plate, holes are uniformly distributed at the bottom of the air distribution cap, and one end of each hole is connected with the air passing hole.
The primary air pipe is provided with an induced draft fan and a preheater, the preheater is located behind the induced draft fan, and the induced draft fan is electrically connected with the interlocking controller.
The principle of the utility model is as follows:
when the fluidized bed is in normal operation, air enters the primary air pipe through the draught fan, enters the fluidized bed through the preheater, provides oxygen for combustion in the fluidized bed and blows solid particles in the fluidized bed to generate fluidization, the secondary air pipe enters the air to provide sufficient oxygen for combustion, so that solids are fully combusted, coal particles enter the coal particle feeding pipe after being pressurized through the coal particle bin to enter the fluidized bed to provide fuel for combustion in the fluidized bed, limestone enters the limestone feeding pipe after being pressurized through the limestone bin to enter the fluidized bed, sulfur-containing gas generated by combustion in the fluidized bed is reacted and settled, high temperature is generated by combustion in the fluidized bed, heat exchange is carried out through circulating water in the water-cooled wall and water, water is gasified into steam in a high-temperature state, a steam drum carries out gas-liquid separation on the unvaporized water and the gasified steam, the steam enters a subsequent superheating process, and the water returns to the water-cooled wall to continue heat exchange, the fluidized bed top produces not burning complete coal cinder, hot-air and the coal ash mixture after the burning and gets into cyclone, through cyclone gas-solid separation, coal ash and coal cinder return the fluidized bed through the feed back pipe of bottom and continue burning, and gas gets into next process, the effect of feed back valve from the whirlwind outlet pipe: continuously returning the ash separated by the cyclone separator to the fluidized bed for circulating combustion to realize the balance of returned materials; a certain material height is established in the material return pipe to form the seal of the fluidized bed and the cyclone separator, so that the short circuit of the flue gas is prevented. And a dust exhaust pipe is arranged at the lower part of the feed back valve, the dust exhaust valve is opened periodically to exhaust coal ash, and if the dust exhaust pipe is blocked, a purging electromagnetic valve is opened to perform back blowing on high-pressure air introduced into the primary air pipe through the purging pipe.
Preventing high-temperature coking: if the temperature in the fluidized bed is too high, when the temperature displayed by the second thermometer exceeds the upper limit of a set value, the second thermometer transmits a signal to the interlocking controller, the interlocking controller controls the nitrogen electromagnetic valve to be opened, so that low-temperature nitrogen which is not preheated enters the fluidized bed through the primary air pipe, the nitrogen is introduced to reduce the oxygen content in the fluidized bed while the fluidized bed is cooled, the combustion is slowed down, the temperature of the fluidized bed is reduced, when the temperature is reduced to be lower than the upper limit of the set temperature, the second thermometer transmits a signal to the interlocking controller, the interlocking controller controls the nitrogen electromagnetic valve to be closed, the reaction continues to be carried out, and the temperature in the fluidized bed is ensured to be within the set range.
And (3) low-temperature coking prevention: if the temperature in the fluidized bed is too low, the internal pressure difference of the fluidized bed is too high at the moment, the primary air pipe cannot completely blow up the solids in the fluidized bed to form a fluidized state, so that the local combustion in the fluidized bed is overheated, but the heat cannot be conveyed to the top of the fluidized bed, when the temperature displayed by the second thermometer is lower than the lower limit of a set value, the second thermometer transmits a signal to an interlocking controller, the interlocking controller controls the coal particle feeding electromagnetic valve and the limestone feeding electromagnetic valve to be closed and controls an induced draft fan to increase the power, the solid feeding in the fluidized bed is stopped and the air volume is increased, so that the pressure difference of the fluidized bed is reduced and the solid particles on the air distribution plate are blown up at the same time, the combustion heat is fully conveyed to the top of the fluidized bed again, when the temperature is increased to the lower limit of the set temperature, the second thermometer transmits a signal to the interlocking controller, and the interlocking controller controls the coal particle feeding electromagnetic valve and the limestone feeding electromagnetic valve to be opened and controls the induced draft fan to recover the power, the reaction is continued, the temperature in the fluidized bed is ensured to be within a set range, the pressure difference meter displays the upper and lower pressure difference in the fluidized bed, and the pressure difference in the fluidized bed can be controlled in an auxiliary observation mode.
Distributing airflow in the air distribution plate: the air distribution plate is characterized in that primary air enters the upper part of the air distribution plate through air holes of the air distribution plate, is guided to the holes through the air distribution cap to enter the fluidized bed, airflow downwards strikes the upper part of the air distribution plate to generate dispersed air to diffuse around the air distribution plate, and solid particles on the air distribution plate are uniformly blown up, so that the solid particles with small particle sizes can be prevented from directly falling into the air holes to the lower part of the air distribution plate or blocking the air holes, the fluidization is ensured to be sufficient, and overheating coking caused by the fact that part of the solid particles are stopped on the air distribution plate is avoided.
And the first thermometer is used for observing the temperature of the middle part of the fluidized bed and is combined with the second thermometer for observing and judging the combustion condition in the fluidized bed.
The utility model has the advantages that:
the utility model provides a device of prevention circulating fluidized bed boiler coking adopts the anti-coking device of interlocking automatic control, and the temperature is stable in the control fluidized bed, prevents the coking, adopts novel fluidized bed air distributor simultaneously, makes fluidized bed gas distribution more even, prevents that the cap that distributes from blockking up and arousing that local temperature is too high to produce the coking.
Drawings
Fig. 1 is a schematic structural diagram of a device for preventing a circulating fluidized bed boiler from coking.
Fig. 2 is an enlarged view in a circle a in a structural schematic diagram of a device for preventing coking of a circulating fluidized bed boiler according to the present invention.
(1, fluidized bed, 2, interlocking controller, 3, primary air pipe, 4, nitrogen pipe, 5, water wall, 6, steam pocket, 7, steam outlet pipe, 8, coal particle inlet pipe, 9, limestone inlet pipe, 10, coal particle bin, 11, limestone bin, 12, secondary air pipe, 13, outlet pipe, 14, cyclone separator, 15, cyclone outlet pipe, 16, return pipe, 17, return valve, 18, dust exhaust pipe, 19, dust exhaust valve, 20, purging pipe, 21, purging solenoid valve, 22, coal particle inlet solenoid valve, 23, limestone inlet solenoid valve, 24, nitrogen solenoid valve, 25, thermometer I, 26, thermometer II, 27, differential pressure gauge, 28, air distribution plate, 29, air distribution cap, 30, air vent, 31, hole, 32, draught fan, 33, preheater)
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
The utility model provides a heating and life hot water integration constant temperature equipment, its characterized in that: the device comprises a fluidized bed 1, an interlocking controller 2 is arranged outside the fluidized bed 1, a primary air pipe 3 is arranged at the bottom of the fluidized bed 1, a nitrogen pipe 4 is arranged on the primary air pipe 3, a water-cooled wall 5 is arranged outside the fluidized bed 1, the water-cooled wall 5 is connected with a steam drum 6 through a pipeline, the bottom of the steam drum 6 is connected with a return water-cooled wall 5 through a pipeline, a steam outlet pipe 7 is arranged at the upper part of the steam drum 6, a coal particle inlet pipe 8 and a limestone inlet pipe 9 are arranged on the side surface of the fluidized bed 1, the coal particle inlet pipe 8 is connected with a coal particle bin 10, the limestone inlet pipe 9 is provided with a limestone bin 11, a secondary air pipe 12 is arranged on the side surface of the fluidized bed 1, an outlet pipe 13 is arranged at the top of the fluidized bed 1, a cyclone separator 14 is connected at one end of the outlet pipe 13, a cyclone separator 14 is provided with a cyclone outlet pipe 15 at the top, a return pipe 16 is arranged at the bottom of the cyclone separator 14, the feed back pipe 16 is connected at one end to the fluidized bed 1.
The device is characterized in that the material return pipe 16 is provided with a material return valve 17, the bottom of the material return valve 17 is connected with a dust exhaust pipe 18, the dust exhaust pipe 18 is provided with a dust exhaust valve 19, the side surface of the dust exhaust pipe 18 is provided with a purging pipe 20, the tail end of the purging pipe 20 is connected to the primary air pipe 3, and the purging pipe 20 is provided with a purging electromagnetic valve 21.
Coal grain inlet pipe 8 is equipped with coal grain feeding solenoid valve 22, limestone feed pipe 9 is equipped with limestone feeding solenoid valve 23, coal grain feeding solenoid valve 22 and limestone feeding solenoid valve 23 are even with interlocking controller 2 electricity.
The nitrogen gas pipe 4 is provided with a nitrogen gas solenoid valve 24, and the nitrogen gas solenoid valve 24 is electrically connected with the interlock controller 2.
The middle part of the fluidized bed 1 is provided with a first thermometer 25, the top of the fluidized bed 1 is provided with a second thermometer 26, the side surface of the fluidized bed 1 is provided with a differential pressure meter 27, and the second thermometer 26 is electrically connected with the interlocking controller 2.
The bottom of the fluidized bed 1 is provided with an air distribution plate 28, the air distribution plate 28 is provided with an air distribution cap 29 and an air passing hole 30, the air passing hole 30 penetrates through the air distribution plate 28, the air distribution cap 29 is positioned above the air passing hole 30 and fixedly connected to the air distribution plate 28, the bottom of the air distribution cap 29 is provided with uniformly distributed holes 31, and one end of each hole 31 is connected with the air passing hole 30.
The primary air pipe 3 is provided with an induced draft fan 32 and a preheater 33, the preheater 33 is located behind the induced draft fan 32, and the induced draft fan 32 is electrically connected with the interlocking controller 2.
According to fig. 1 and 2:
when the fluidized bed is in normal operation, air enters the primary air pipe 3 through the draught fan 32, enters the fluidized bed 1 through the preheater 33 in a preheating mode, supplies oxygen for combustion in the fluidized bed 1 and blows solid particles in the fluidized bed 1 to generate fluidization, air enters the secondary air pipe 12 to supply sufficient oxygen for combustion, so that solids are fully combusted, coal particles enter the coal particle feeding pipe 8 after being pressurized through the coal particle bin 10 to enter the fluidized bed 1 to supply fuel for combustion in the fluidized bed 1, limestone enters the limestone feeding pipe 9 after being pressurized through the limestone bin 11 to enter the fluidized bed 1 to react and settle sulfur-containing gas generated by combustion in the fluidized bed 1, high temperature is generated by combustion in the fluidized bed 1, the temperature is reduced through circulating water in the water cooling wall 5 and exchanges heat with water, water is gasified into steam in a high-temperature state, and the steam pocket 6 performs gas-liquid separation on non-gasified water and gasified steam, steam enters a subsequent overheating process, water returns to the water-cooled wall 5 to continue heat exchange, unburned and complete coal particles, hot air and a mixture of combusted coal ash generated at the top of the fluidized bed 1 enter the cyclone separator 14, the coal ash and the coal particles are subjected to gas-solid separation by the cyclone separator 14, the coal ash and the coal particles return to the fluidized bed 1 through the material return pipe 16 at the bottom to continue combustion, and gas enters a next process from the cyclone outlet pipe 15 and functions of a material return valve 17: the ash separated by the cyclone separator 14 is continuously sent back to the fluidized bed 1 for circulating combustion to realize the balance of returned materials; a certain material height is established in the feed back pipe 16, so that the fluidized bed 1 and the cyclone separator 14 are sealed, and the short circuit of the flue gas is prevented. The lower part of the material returning valve 17 is provided with a dust discharging pipe 18, the dust discharging valve 19 is opened periodically to discharge coal ash, if the dust discharging pipe 18 is blocked, a purging electromagnetic valve 21 is opened to introduce high-pressure air back blowing of the primary air pipe 3 through a purging pipe 20.
Preventing high-temperature coking: if the temperature in the fluidized bed 1 is too high, when the temperature displayed by the second thermometer 26 exceeds the upper limit of the set value, the second thermometer 26 transmits a signal to the interlocking controller 2, the interlocking controller 2 controls the nitrogen electromagnetic valve 24 to be opened, so that the non-preheated low-temperature nitrogen enters the fluidized bed 1 through the primary air pipe 3, the nitrogen introduced into the fluidized bed 1 can reduce the oxygen content in the fluidized bed 1 while cooling the fluidized bed 1, the combustion is slowed down, the temperature of the fluidized bed 1 is reduced, when the temperature is reduced to be lower than the upper limit of the set temperature, the second thermometer 26 transmits a signal to the interlocking controller 2, the interlocking controller 2 controls the nitrogen electromagnetic valve 24 to be closed, the reaction continues, and the temperature in the fluidized bed 1 is ensured to be within the set range.
And (3) low-temperature coking prevention: if the temperature in the fluidized bed 1 is too low, the internal pressure difference of the fluidized bed 1 is too high at the moment, the primary air pipe 3 cannot completely blow up the solids in the fluidized bed 1 to form a fluidized state, so that the local combustion in the fluidized bed 1 is overheated, but the heat cannot be conveyed to the top of the fluidized bed 1, the second thermometer 26 displays that the temperature is lower than the lower limit of a set value, the second thermometer 26 transmits a signal to the interlocking controller 2, the interlocking controller 2 controls the coal particle feeding electromagnetic valve 22 and the limestone feeding electromagnetic valve 23 to be closed and controls the induced draft fan 32 to increase the power, the solid feeding in the fluidized bed 1 is stopped and the air volume is increased, so that the pressure difference of the fluidized bed 1 is reduced and the solid particles on the air distribution plate 28 are blown up at the same time, the combustion heat is fully conveyed to the top of the fluidized bed 1 again, when the temperature is increased to the lower limit of the set temperature, the second thermometer 26 transmits a signal to the interlocking controller 2, and the interlocking controller 2 controls the coal particle feeding electromagnetic valve 22 and the limestone feeding electromagnetic valve 23 to be opened and controls the induced draft fan 32 The power is recovered, the reaction is continued, the temperature in the fluidized bed 1 is ensured to be within a set range, the pressure difference meter 27 displays the upper and lower pressure difference in the fluidized bed 1, and the pressure difference in the fluidized bed 1 can be controlled in an auxiliary observation mode.
Air flow distribution in the air distribution plate 28: the primary air enters the upper part of the air distribution plate 28 through the air passing holes 30 of the air distribution plate 28, is guided to the holes 31 through the air distribution cap 29 and enters the fluidized bed 1, the air flow downwards strikes the upper part of the air distribution plate 28 to generate dispersed air which flows to the periphery of the air distribution plate 28 to be diffused, solid particles on the air distribution plate 28 are uniformly blown, the solid particles with small particle sizes can be prevented from directly falling into the air passing holes 30 to the lower part of the air distribution plate 28 or blocking the air passing holes 30, and therefore sufficient fluidization is guaranteed, and overheating coking caused by the fact that part of the solid particles stay on the air distribution plate 28 is avoided.
The first thermometer 25 is used for observing the temperature of the middle part of the fluidized bed 1, and the second thermometer 26 is combined for observing and judging the combustion condition in the fluidized bed 1.
The utility model discloses an interlocking automatic control anti-coking device, the control fluidized bed internal temperature is stable, prevents the coking, adopts novel fluidized bed air distributor simultaneously, makes fluidized bed gas distribution more even, prevents that the cap that distributes from blockking up and arousing that local temperature is too high to produce the coking.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a device of prevention circulating fluidized bed boiler coking which characterized in that: including fluidized bed (1), fluidized bed (1) outside is equipped with interlocking controller (2), fluidized bed (1) bottom is equipped with air hose (3), air hose (3) is equipped with nitrogen gas pipe (4), fluidized bed (1) outside is equipped with water-cooling wall (5), water-cooling wall (5) have steam pocket (6) through the tube coupling, steam pocket (6) bottom returns water-cooling wall (5) through the tube coupling, steam pocket (6) upper portion is equipped with steam outlet pipe (7), fluidized bed (1) side is equipped with coal granule inlet pipe (8) and limestone inlet pipe (9), coal granule inlet pipe (8) are connected with coal granule storehouse (10), limestone inlet pipe (9) are equipped with limestone storehouse (11), fluidized bed (1) side is equipped with secondary inlet pipe (12), fluidized bed (1) top is equipped with outlet pipe (13), one end of the outlet pipe (13) is connected with a cyclone separator (14), the top of the cyclone separator (14) is provided with a cyclone outlet pipe (15), the bottom of the cyclone separator (14) is provided with a material return pipe (16), and one end of the material return pipe (16) is connected into the fluidized bed (1).
2. The apparatus of claim 1, wherein the means for preventing coking in the circulating fluidized bed boiler comprises: the dust removing device is characterized in that the material return pipe (16) is provided with a material return valve (17), the bottom of the material return valve (17) is connected with a dust removing pipe (18), the dust removing pipe (18) is provided with a dust removing valve (19), the side face of the dust removing pipe (18) is provided with a purging pipe (20), the tail end of the purging pipe (20) is connected to the primary air pipe (3), and the purging pipe (20) is provided with a purging electromagnetic valve (21).
3. The apparatus of claim 1, wherein the means for preventing coking in the circulating fluidized bed boiler comprises: coal grain inlet pipe (8) are equipped with coal grain feeding solenoid valve (22), limestone inlet pipe (9) are equipped with limestone feeding solenoid valve (23), coal grain feeding solenoid valve (22) and limestone feeding solenoid valve (23) are connected with interlocking controller (2) electricity.
4. The apparatus of claim 1, wherein the means for preventing coking in the circulating fluidized bed boiler comprises: the nitrogen pipe (4) is provided with a nitrogen electromagnetic valve (24), and the nitrogen electromagnetic valve (24) is electrically connected with the interlocking controller (2).
5. The apparatus of claim 1, wherein the means for preventing coking in the circulating fluidized bed boiler comprises: fluidized bed (1) middle part is equipped with thermometer one (25), fluidized bed (1) top is equipped with thermometer two (26), fluidized bed (1) side is equipped with differential pressure gauge (27), thermometer two (26) and interlocking controller (2) electricity link.
6. The apparatus of claim 1, wherein the means for preventing coking in the circulating fluidized bed boiler comprises: fluidized bed (1) bottom is equipped with air distribution plate (28), air distribution plate (28) are equipped with air distribution cap (29) and cross gas pocket (30), cross gas pocket (30) and run through air distribution plate (28), air distribution cap (29) are located gas pocket (30) top and fixed connection on air distribution plate (28), air distribution cap (29) bottom is equipped with evenly distributed's hole (31), hole (31) one end is connected with gas pocket (30).
7. The apparatus of claim 1, wherein the means for preventing coking in the circulating fluidized bed boiler comprises: primary air pipe (3) are equipped with draught fan (32) and pre-heater (33), pre-heater (33) are located draught fan (32) back, draught fan (32) and interlocking controller (2) electricity link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120737617.7U CN214891142U (en) | 2021-04-12 | 2021-04-12 | Device for preventing circulating fluidized bed boiler from coking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120737617.7U CN214891142U (en) | 2021-04-12 | 2021-04-12 | Device for preventing circulating fluidized bed boiler from coking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214891142U true CN214891142U (en) | 2021-11-26 |
Family
ID=78949422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120737617.7U Expired - Fee Related CN214891142U (en) | 2021-04-12 | 2021-04-12 | Device for preventing circulating fluidized bed boiler from coking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214891142U (en) |
-
2021
- 2021-04-12 CN CN202120737617.7U patent/CN214891142U/en not_active Expired - Fee Related
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