CN219588932U - Anti-blocking system of fast peak-adjusting coupling air preheater of circulating fluidized bed generator set - Google Patents
Anti-blocking system of fast peak-adjusting coupling air preheater of circulating fluidized bed generator set Download PDFInfo
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- CN219588932U CN219588932U CN202321165433.3U CN202321165433U CN219588932U CN 219588932 U CN219588932 U CN 219588932U CN 202321165433 U CN202321165433 U CN 202321165433U CN 219588932 U CN219588932 U CN 219588932U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model relates to a fast peak-adjusting coupling air preheater anti-blocking system of a circulating fluidized bed generator set, which comprises the following components: the device comprises a hearth, a cyclone separator, a tail flue and an air preheater; the outlet of the hearth is communicated with the flue gas inlet of the cyclone separator, the flue gas outlet of the cyclone separator is communicated with the tail flue, the feed back opening of the cyclone separator is communicated with the hearth through a feed back pipe, the air preheater is arranged in the tail flue and comprises a cold end and a hot end, and the hot end is communicated with the hearth; the device also comprises a circulating ash mechanism, an air supply mechanism and a smoke recycling mechanism, wherein the circulating ash mechanism is used for storing high-temperature solid particles at a feed back port; the primary fan of the air supply mechanism is used for conveying primary air to the hearth, the secondary fan is used for conveying secondary air to the hearth and recirculating the secondary air, and the smoke recirculating mechanism is used for conveying smoke to the hearth; the ash circulating mechanism is used for heating the recirculated secondary air and the flue gas; the air temperature entering the air preheater is improved while the peak is quickly regulated, so that the super-discharge of nitrogen oxides is avoided, and the air preheater is blocked.
Description
Technical Field
The utility model relates to the technical field of boilers, in particular to a rapid peak regulation coupling air preheater anti-blocking system of a circulating fluidized bed generator set.
Background
At present, in order to actively push the structural optimization upgrading of the energy industry, the clean high-efficiency flexibility level of the coal motor unit is further improved, and when demonstration and implementation of the flexibility improvement are carried out on the circulating fluidized bed generator unit, the following problems can occur under deep peak shaving: when the load of the unit is too low, the total air quantity of the boiler is smaller, in order to ensure that the fluidization air quantity is not lower than the minimum fluidization air quantity, the primary air quantity is larger, the secondary air quantity can only ensure the low-load stable operation of a single secondary air machine, but the operation safety risk of the single secondary air machine is larger, so that two secondary air machines generally operate simultaneously, the oxygen-enriched combustion of the boiler (the operation oxygen quantity can even reach 10 percent) under the low load is caused, the generation quantity of nitrogen oxides is greatly increased, however, the outlet smoke temperature (about 700 ℃) of a low-load hearth is far lower than the window temperature (800 ℃) of SNCR reaction, the SNCR loses the denitrification effect, and finally the nitrogen oxides are superdischarged; when the load of the unit is too low, the air preheater is blocked by ammonium bisulfate due to the lower temperature of flue gas at the inlet of the air preheater, so that the resistance of the air preheater is greatly increased, and the safety, economy and stable operation of the unit are affected; in the load reduction process, the load reduction rate is difficult to reach the rate of scheduling requirements due to the large thermal inertia of the boiler.
Aiming at the problems of the above-mentioned nitrogen oxide superdischarge, the air preheater blockage, the insufficient load reduction rate and the like, the prior art also provides a related solution, and although the corresponding effect is generated to a certain extent, all the problems cannot be simultaneously considered.
Disclosure of Invention
The utility model aims to solve the technical problem that the circulating fluidized bed generator set in the prior art cannot simultaneously take account of the defects of air preheater blockage, insufficient load reduction rate and super-discharge of nitrogen oxides during deep peak shaving, so as to provide a circulating fluidized bed boiler wide-load express peak shaving system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a fast peak-adjusting coupling air preheater anti-blocking system of a circulating fluidized bed generator set comprises: the device comprises a hearth, a cyclone separator, a tail flue and an air preheater; the cyclone separator comprises a flue gas inlet, a flue gas outlet and a feed back port, the outlet of the hearth is communicated with the flue gas inlet, the flue gas outlet is communicated with the tail flue, the feed back port is communicated with the hearth through a feed back pipe, the air preheater is arranged in the tail flue, the air preheater comprises a cold end and a hot end, and the hot end is communicated through an air distribution plate of the hearth;
also comprises a circulating ash mechanism, an air supply mechanism and a smoke recycling mechanism,
the circulating ash mechanism comprises an ash cooler and a circulating ash bin, an inlet of the circulating ash bin is communicated with the feed back opening, an outlet of the circulating ash bin is communicated with the feed back pipe, and the ash cooler is communicated between the circulating ash bin and the feed back opening;
the air supply mechanism comprises a primary air blower, a primary air pipe, a secondary air blower, a secondary air pipe and a secondary branch pipe, the flue gas recirculation mechanism comprises a recirculation flue, an inlet of the primary air blower is communicated with the outside air, an outlet of the primary air blower is communicated with the cold end through the primary air pipe, an inlet of the recirculation flue is communicated with the tail flue, and an outlet of the recirculation flue is communicated with an inlet of the primary air blower; the inlet of the secondary air fan is communicated with the outside air, the outlet of the secondary air fan is communicated with the cold end through the secondary air pipe, the inlet of the secondary branch pipe is communicated with the secondary air pipe before the outlet of the secondary air fan and the cold end, the outlet of the secondary branch pipe is communicated with the inlet of the secondary air fan, and the ash cooler is arranged on the recirculation flue and the secondary branch pipe and used for heating the secondary air in the secondary branch pipe and the flue gas in the recirculation flue.
Preferably, the ash circulating mechanism further comprises a discharge valve, and the discharge valve is arranged between the feed back opening and the ash cooler.
Preferably, the air supply mechanism further comprises a first shut-off door and a first adjusting door, wherein the first shut-off door and the first adjusting door are both communicated with the secondary branch pipe, the first shut-off door is located between the ash cooler and the outlet of the secondary air fan, and the first adjusting door is located between the ash cooler and the inlet of the secondary air fan.
Preferably, the flue gas recirculation mechanism further comprises a second shut-off gate and a second regulating gate, wherein the second shut-off gate and the second regulating gate are both communicated with the recirculation flue, the second shut-off gate is positioned between the ash cooler and the tail flue, and the second regulating gate is positioned between the ash cooler and the inlet of the primary fan.
Preferably, the flue gas recycling mechanism further comprises a recycling fan and condensing equipment, wherein the recycling fan and the condensing equipment are sequentially communicated with the recycling flue and are located between the ash cooler and the second shut-off door.
Preferably, the flue gas recirculation mechanism further comprises a desulfurization device and a chimney, wherein an inlet of the desulfurization device is communicated with an outlet of the tail flue, an outlet of the desulfurization device is communicated with the chimney, and an inlet of the recirculation flue is communicated between the desulfurization device and the chimney.
Preferably, the flue gas recirculation mechanism further comprises a dust removal device, an inlet of the dust removal device is communicated with an inlet of the tail flue, and an outlet of the dust removal device is communicated with an inlet of the desulfurization device.
Preferably, the recycling mechanism further comprises an induced draft fan, an inlet of the induced draft fan is communicated with an outlet of the dust removing device, and an outlet of the induced draft fan is communicated with an inlet of the desulfurizing device.
Compared with the prior art, the utility model has the beneficial effects that:
according to the rapid peak regulation coupling air preheater anti-blocking system of the circulating fluidized bed generator set, which is provided by the technical scheme, the separated high-temperature solid particles are stored or released through the circulating ash mechanism so as to control the intensity of convective heat transfer in the hearth, thereby achieving the purpose of rapid deep peak regulation, and avoiding the problems of superemission of nitrogen oxides and insufficient load reduction rate caused by high boiler operation oxygen when the generator set is in low load and load reduction; further, the temperature of the air introduced into the primary air pipe and the secondary air pipe is raised and heated by utilizing heat exchange between the ash cooler and the high-temperature solid particles, so that the temperature of cold end air entering the air preheater is increased, and the problem of blockage of the air preheater due to low inlet flue gas temperature is avoided; the flue gas recirculation mechanism is matched with the primary air blower, so that the air quantity of the primary air is greatly improved, and the problem of insufficient primary air quantity is avoided; meanwhile, by additionally arranging the secondary branch pipe on the secondary air pipe, the output of the secondary air machine is increased, and the problem of stall of the secondary air under the low-load operation condition is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall structure of an anti-blocking system according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a furnace; 11. a primary air chamber; 2. a cyclone separator; 21. a feed back port; 22. a feed back pipe; 23. a hot secondary air duct; 24. a discharge valve; 25. a flue gas inlet; 26. a flue gas outlet; 3. a tail flue; 31. a hot primary air duct; 4. an air preheater; 41. a cold end; 42. a hot end;
5. an ash cooler; 51. circulating ash bin;
6. a secondary air blower; 61. a secondary air duct; 62. a secondary branch pipe; 63. a first shut-off gate; 64. a first regulating gate;
7. a primary air blower; 71. a primary air duct;
8. a recirculation fan; 81. a condensing device; 82. recycling the flue; 83. a second shut-off gate; 84. a second regulating gate; 85. a desulfurizing device; 86. a chimney; 87. a dust removal device; 88. and (5) a draught fan.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The embodiment of the utility model provides an anti-blocking system of a fast peak-adjusting coupling air preheater of a circulating fluidized bed generator set, which is shown in figure 1 and comprises the following components: the device comprises a hearth 1, a cyclone separator 2, a tail flue 3 and an air preheater 4; the cyclone separator 2 is used for reducing dust discharged by the hearth 1, and the cyclone separator 2 comprises a flue gas inlet 25, a flue gas outlet 26 and a feed back opening 21; specifically, the outlet of the hearth 1 is communicated with the flue gas inlet 25 of the cyclone separator 2, the flue gas outlet 26 of the cyclone separator 2 is communicated with the tail flue 3, and the feed back opening 21 of the cyclone separator 2 is communicated with the hearth 1 through the feed back pipe 22 for separating gas and fixed particles from the flue gas discharged from the hearth 1; the air preheater 4 is arranged in the tail flue 3 and is used for conducting heat carried in smoke in the tail flue 3.
Specifically, the device also comprises a circulating ash mechanism, an air supply mechanism and a smoke recycling mechanism; the circulating ash mechanism comprises an ash cooler 5 and a circulating ash bin 51, wherein the ash cooler 5 is used for cooling fixed particles separated from the cyclone separator 2, the circulating ash bin 51 is used for storing solid particles cooled by the ash cooler 5 so as to be conveyed to the hearth 1 again for continuous combustion, meanwhile, the adjustment of the amount of the solid particles entering the hearth 1 can be realized, the inlet of the circulating ash bin 51 is communicated with the feed back hole 21, the outlet of the circulating ash bin 51 is communicated with the feed back pipe 22, the ash cooler 5 is communicated between the circulating ash bin 51 and the feed back hole 21, and the amount of the solid particles entering the hearth 1 is adjusted through the circulating ash bin 51 so as to realize the purpose of quick deep peak regulation of a unit; the air supply mechanism comprises a primary air blower 7, a primary air pipe 71, a secondary air blower 6 and a secondary air pipe 61, and the air supply mechanism comprises a primary air blower 7, a primary air pipe 71, a secondary air blower 6, a secondary air pipe 61 and a secondary branch pipe 62; the flue gas recirculation mechanism includes a recirculation flue 82.
The inlet of the primary air blower 7 is communicated with the outside air, and the outlet of the primary air blower 7 is communicated with the cold end 41 of the air preheater 4 through a primary air pipe 71, namely, the primary air blower 7 provides primary air for the inside of the air preheater 4 through the primary air pipe 71; the inlet of the recycling flue 82 is communicated with the tail flue 3, the outlet of the recycling flue 82 is communicated with the inlet of the primary air fan 7, and the recycling flue 82 is used for introducing flue gas in the tail flue 3 into the primary air pipe 71 through the primary air fan 7, heating the flue gas led out of the recycling flue 82 through the ash cooler 5 arranged on the recycling flue 82, enabling the heated flue gas to be mixed with primary air extracted by the primary air fan 7, then, conveying the flue gas into the air preheater 4 from the cold end 41 through the primary air pipe 71 for further heating, and finally conveying the flue gas into the hearth 1 through the hot end 42 of the air preheater 4.
Specifically, the system also comprises a primary air chamber 11, wherein the primary air chamber 11 is used for concentrating the mixed flue gas and primary air in an isobaric air box and then guiding the mixed flue gas and primary air into the hearth 1; that is, the primary air chamber 11 is connected to the air distribution plate of the furnace 1, and primary air (including primary air heated by the ash cooler 5 and primary air and flue gas not heated by the ash cooler 5) drawn through the primary air duct 71 enters the air preheater 4 from the cold end 41 of the air preheater 4 to be further heated, is then introduced into the primary air chamber 11 through the hot end 42 of the air preheater 4 via the hot primary air duct 31, and finally enters the furnace 1 through the air distribution plate at the top of the primary air chamber 11.
The inlet of the secondary branch pipe 62 is communicated with a secondary air pipe 61 between the outlet of the secondary air blower 6 and the cold end 41, and the outlet of the secondary branch pipe 62 is communicated with the inlet of the secondary air blower 6; that is, part of the secondary air extracted from the air by the secondary air blower 6 enters the air preheater 4 from the cold end 41 through the secondary air duct 61, the other part of the secondary air is led out as recycled secondary air from between the outlet of the secondary air blower 6 and the cold end 41 through the secondary branch pipe 62, then enters the secondary air duct 61 through the inlet of the secondary air blower 6, and the recycled secondary air is heated by heating the recycled secondary air through the ash cooler 5 arranged on the recycling flue 82, so that the recycled secondary air heated by heating is mixed with the secondary air extracted from the air, then is conveyed into the air preheater 4 through the cold end 41 for further heating through the secondary air duct 61, and finally is conveyed into the hearth 1 through the hot end 42 of the air preheater 4.
Specifically, the system is also provided with a hot secondary air channel 23, the inlet of the hot secondary air channel 23 is communicated with the hot end 42 of the air preheater 4, and the outlet of the hot secondary air channel 23 is communicated with the hearth 1; that is, the secondary air extracted through the secondary air duct 61 (which includes the recirculated secondary air heated by the ash cooler 5 and the secondary air not heated by the ash cooler 5) enters the air preheater 4 from the cold end 41 of the air preheater 4 to be further heated, and then enters the furnace 1 through the hot end 42 of the air preheater 4 via the hot secondary air duct 23.
The separated high-temperature solid particles are stored or released through the circulating ash mechanism so as to control the convective heat exchange intensity in the hearth 1, thereby achieving the purpose of rapid deep peak regulation and avoiding the problems of super-discharge of nitrogen oxides and insufficient load reduction rate caused by high operating oxygen of a boiler when the unit is in low load reduction; further, the high-temperature solid particles are subjected to heat exchange by the ash cooler 5 to heat and heat the air introduced into the primary air pipe 71 and the secondary air pipe 61 respectively, so that the temperature of the air entering the air preheater 4 is increased, and the problem of blockage of the air preheater 4 caused by low inlet flue gas temperature is avoided; the flue gas recirculation mechanism is matched with the primary air blower 7, so that the air quantity of primary air is greatly improved, and the problem of insufficient primary air quantity is avoided; meanwhile, by additionally arranging the secondary branch pipe 62 on the secondary air pipe 61, the output of the secondary air machine 6 is increased, and the problem of stall of the secondary air machine 6 under the low-load operation condition is avoided.
Specifically, in order to facilitate the control of the particles entering the furnace 1, the ash circulating mechanism further comprises a discharge valve 24, and the discharge valve 24 is arranged between the feed back opening 21 and the ash cooler 5 and is used for controlling the amount of solid particles discharged from the feed back opening 21; further, the discharge valve 24 is opened when the unit is in load reduction, and is closed when the unit is in load increase; and when the discharge valve 24 is opened, the solid particles fall into the ash cooler 5 to be cooled, and fall into the circulating ash bin 51 after being cooled.
Specifically, in order to facilitate controlling the air volume of the secondary air blower 6 entering the air preheater 4, the air supply mechanism further includes a first shut-off gate 63 and a first adjusting gate 64, wherein the first shut-off gate 63 and the first adjusting gate 64 are both communicated on the secondary branch pipe 62, the first shut-off gate 63 is located between the ash cooler 5 and the outlet of the secondary air blower 6, and the first adjusting gate 64 is located between the ash cooler 5 and the inlet of the secondary air blower 6; when the first shut-off gate 63 is closed, the secondary air extracted by the secondary air blower 6 directly enters the air preheater 4 from the cold end 41 through the secondary air pipe 61, when the first shut-off gate 63 is opened, part of the secondary air extracted by the secondary air blower 6 enters the air preheater 4 from the cold end 41 through the secondary air pipe 61, part of the secondary air flows into the secondary branch pipe 62 to serve as recycled secondary air, and the recycled secondary air flowing into the secondary straight pipe is heated by the ash cooler 5; further, the operator can adjust the secondary air quantity by adjusting the opening of the first adjusting door 64 according to the actual requirement.
Specifically, the flue gas recirculation mechanism further comprises a second shut-off door 83 and a second adjusting door 84, both the second shut-off door 83 and the second adjusting door 84 are communicated with the recirculation flue 82, and in order to prevent flue gas from flowing into the recirculation flue 82 after the flue gas recirculation mechanism is stopped, the second shut-off door 83 is positioned between the ash cooler 5 and the tail flue 3; and in order to realize the regulation of the primary air quantity in the primary air pipe 71, a second regulating door 84 is positioned between the ash cooler 5 and the inlet of the primary air fan 7; that is, the opening degree of the second damper 84 is adjusted to adjust the primary air volume.
Specifically, the discharge valve 24, the first shut-off gate 63, the first regulating gate 64, the second shut-off gate 83 and the second regulating gate 84 may be electrically or pneumatically operated, and the DCS system is used to perform opening and closing control by signal connection.
Preferably, the flue gas circulating mechanism further comprises a recirculation fan 8 and a condensing device 81, wherein the recirculation fan 8 and the condensing device 81 are sequentially communicated with the recirculation flue 82 and are positioned between the ash cooler 5 and the second shut-off door 83; namely, the second shut-off door 83 is opened, the flue gas in the tail flue 3 flows into the recirculation flue 82, is subjected to condensation dehydration through the condensation equipment 81, is boosted through the flue gas recirculation fan 8, is heated through the ash cooler 5, is finally sent into the primary air pipe 71, is mixed with primary air extracted by the primary air pipe 7, and finally enters the air preheater 4 through the cold end 41 for further heating; wherein, the flue gas after temperature rise and pressure rise realizes the control of the air quantity of the primary air pipe 71 by adjusting the opening of the second adjusting door 84; specifically, the condensing device 81 includes a condenser, and the condensed water for the condenser is domestic water in a factory, and the cooling water can be used as domestic hot water after being cooled and heated.
Further, in order to achieve the purpose of purifying the flue gas, the flue gas recycling mechanism further comprises a desulfurization device 85 and a chimney 86, wherein an inlet of the desulfurization device 85 is communicated with an outlet of the tail flue 3, and an outlet of the desulfurization device 85 is communicated with the chimney 86; namely, the flue gas in the tail flue 3 is discharged into the chimney 86 after sulfur dioxide in the flue gas is removed by the desulfurization device 85, and in order to reduce the sulfur content of the flue gas entering the primary air pipe 71 and reduce the corrosion of internal equipment by sulfur-containing flue gas, the inlet of the flue gas pipe is communicated between the desulfurization device 85 and the chimney 86; therefore, the flue gas entering the flue gas duct is flue gas treated by the desulfurization device 85.
Preferably, in order to improve the desulfurization effect of the flue gas, the flue gas recirculation mechanism further comprises a dust removal device 87, wherein the inlet of the dust removal device 87 is communicated with the inlet of the tail flue 3, and the outlet of the dust removal device 87 is communicated with the inlet of the desulfurization device 85; for further reducing dust in the flue gas; more preferably, in order to ensure that the flue gas in the tail flue 3 can be smoothly discharged, the system is further provided with a windward fan, the inlet of the induced draft fan 88 is communicated with the outlet of the dust removing device 87, and the outlet of the induced draft fan 88 is communicated with the inlet of the desulfurizing device 85; that is, the flue gas after dust removal is introduced into the desulfurization device 85 via the induced draft fan 88 to be desulfurized.
The actual operation process comprises the following steps:
when the unit depth peak regulation and load reduction are carried out, firstly, a flue gas recirculation mechanism is started, a flue gas recirculation fan 8 is started, a second shut-off door 83 and a second regulating door 84 are simultaneously opened, so that flue gas subjected to dust removal and desulfurization is led out from between a desulfurization device 85 and a chimney 86 and enters a recirculation flue 82, then, cooling and dehydration are carried out through a condensation device 81, the recirculation fan 8 is used for boosting, meanwhile, the flue gas subjected to condensation and boosting in the recirculation flue 82 is heated by a lime cooler 5, then, the flue gas subjected to temperature boosting and heating is sent into a primary air pipe 71, mixed with primary air extracted by a primary air fan 7, sent into an air preheater 4 from a cold end 41 for further heating, finally, sent into a primary air chamber 11 from a hot end 42 of the air preheater 4 through a hot primary air flue 31, and finally, sent into a hearth 1 through a wind distribution plate at the top of the primary air chamber 11; specifically, the amount of flue gas is adjusted by controlling the opening of the second adjusting door 84 according to the amount of the boiler operating oxygen, so as to ensure that the amount of the boiler operating oxygen is maintained at a low adjustable level. Secondly, based on the secondary air blower 6 in the opened state, the first shut-off gate 63 and the second regulating gate 84 are simultaneously opened, so that a part of secondary air extracted by the secondary air blower 6 directly enters the air preheater 4 from the cold end 41 to be heated, the other part flows into the secondary branch pipe 62 to be used as recirculation secondary air, the recirculation secondary air is heated by the ash cooler 5, and the recirculation secondary air after the heating is returned to the secondary air pipe 61 from the inlet of the secondary air blower 6 and enters the air preheater 4 from the cold end 41 through the secondary air pipe 61 to be further heated, and then enters the hearth 1 through the hot end 42 of the air preheater 4 and the hot secondary air channel 23; specifically, the amount of the recirculated secondary air is comprehensively adjusted through the first adjusting door 64 according to the secondary air inlet of the air preheater 4 and the operation condition of the secondary air blower 6; finally, the recycling ash mechanism is started, the discharge valve 24 is opened, so that the solid particles separated in the cyclone separator 2 fall into the ash cooler 5 for heat exchange, and the solid particles subjected to heat exchange are stored in the recycling ash bin 51.
When the unit depth peak regulation and load rising are carried out, the circulating ash mechanism is closed, the discharge valve 24 is closed, and the outflow of solid particles separated in the cyclone separator 2 is avoided; secondly, closing the air supply mechanism, closing the secondary air blower 6, and closing the first shut-off door 63 and the second regulating door; finally, the flue gas recirculation mechanism is closed, the recirculation fan 8 is closed, and the second shut-off door 83 and the second regulating door 84 are closed.
The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.
Claims (8)
1. A fast peak regulation coupling air preheater anti-blocking system of a circulating fluidized bed generator set is characterized by comprising: the device comprises a hearth, a cyclone separator, a tail flue and an air preheater; the cyclone separator comprises a flue gas inlet, a flue gas outlet and a feed back port, the outlet of the hearth is communicated with the flue gas inlet, the flue gas outlet is communicated with the tail flue, the feed back port is communicated with the hearth through a feed back pipe, the air preheater is arranged in the tail flue, the air preheater comprises a cold end and a hot end, and the hot end is communicated with an air distribution plate of the hearth;
also comprises a circulating ash mechanism, an air supply mechanism and a smoke recycling mechanism,
the circulating ash mechanism comprises an ash cooler and a circulating ash bin, an inlet of the circulating ash bin is communicated with the feed back opening, an outlet of the circulating ash bin is communicated with the feed back pipe, and the ash cooler is communicated between the circulating ash bin and the feed back opening;
the air supply mechanism comprises a primary air blower, a primary air pipe, a secondary air blower, a secondary air pipe and a secondary branch pipe, the flue gas recirculation mechanism comprises a recirculation flue, an inlet of the primary air blower is communicated with the outside air, an outlet of the primary air blower is communicated with the cold end through the primary air pipe, an inlet of the recirculation flue is communicated with the tail flue, and an outlet of the recirculation flue is communicated with an inlet of the primary air blower; the inlet of the secondary air fan is communicated with the outside air, the outlet of the secondary air fan is communicated with the cold end through the secondary air pipe, the inlet of the secondary branch pipe is communicated with the secondary air pipe before the outlet of the secondary air fan and the cold end, the outlet of the secondary branch pipe is communicated with the inlet of the secondary air fan, and the ash cooler is arranged on the recirculation flue and the secondary branch pipe and used for heating the secondary air in the secondary branch pipe and the flue gas in the recirculation flue.
2. The anti-clog system of claim 1, wherein said ash recycling mechanism further comprises an outlet valve disposed between said feed back port and said ash cooler.
3. The anti-blocking system of claim 1, wherein the air supply mechanism further comprises a first shut-off gate and a first adjustment gate, both of which are in communication with the secondary branch, and the first shut-off gate is located between the ash cooler and the outlet of the secondary fan, and the first adjustment gate is located between the ash cooler and the inlet of the secondary fan.
4. The anti-blocking system of claim 1, wherein the flue gas recirculation mechanism further comprises a second shut-off gate and a second adjustment gate, both in communication with the recirculation flue, and the second shut-off gate is located between the ash cooler and the tail flue, and the second adjustment gate is located between the ash cooler and the inlet of the primary fan.
5. The anti-blocking system according to claim 4, wherein the flue gas recirculation mechanism further comprises a recirculation fan and a condensing device, wherein the recirculation fan and the condensing device are sequentially communicated on the recirculation flue and are positioned between the ash cooler and the second shut-off door.
6. The anti-blocking system of claim 1, wherein the flue gas recirculation mechanism further comprises a desulfurization device and a chimney, an inlet of the desulfurization device is in communication with an outlet of the back-end flue, an outlet of the desulfurization device is in communication with the chimney, and an inlet of the recirculation flue is in communication between the desulfurization device and the chimney.
7. The anti-blocking system of claim 6, wherein the flue gas recirculation mechanism further comprises a dust removal device, an inlet of the dust removal device being in communication with an inlet of the back pass, and an outlet of the dust removal device being in communication with an inlet of the desulfurization device.
8. The anti-clogging system of claim 7, wherein said recirculation mechanism further comprises an induced draft fan, an inlet of said induced draft fan being in communication with an outlet of said dedusting apparatus, an outlet of said induced draft fan being in communication with an inlet of said desulfurization device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321165433.3U CN219588932U (en) | 2023-05-12 | 2023-05-12 | Anti-blocking system of fast peak-adjusting coupling air preheater of circulating fluidized bed generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321165433.3U CN219588932U (en) | 2023-05-12 | 2023-05-12 | Anti-blocking system of fast peak-adjusting coupling air preheater of circulating fluidized bed generator set |
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