CN211502748U - Waste heat absorption flue gas recirculation system for improving efficiency of power plant unit - Google Patents
Waste heat absorption flue gas recirculation system for improving efficiency of power plant unit Download PDFInfo
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- CN211502748U CN211502748U CN202020088992.9U CN202020088992U CN211502748U CN 211502748 U CN211502748 U CN 211502748U CN 202020088992 U CN202020088992 U CN 202020088992U CN 211502748 U CN211502748 U CN 211502748U
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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
A waste heat absorption flue gas recirculation system for improving the efficiency of a power plant unit relates to the field of coal-fired power generation. The utility model provides a current boiler have exhaust gas temperature high, and the boiler smoke loss is serious, reduces boiler efficiency's problem. The utility model discloses an air heater flue gas side entry end passes through preheater entry flue and boiler exhanst gas outlet intercommunication, air heater flue gas side exit end passes through preheater export flue and cold smoke flue intercommunication, bypass heat exchanger tube side entry end passes through bypass entry flue and preheater entry flue intercommunication, bypass heat exchanger tube side exit end passes through bypass export flue and preheater export flue intercommunication, bypass heat exchanger shell side entry end passes through circulating fan export flue and flue gas recirculation fan exit end intercommunication, the flue gas recirculation fan entry end passes through circulating fan entry flue and cold smoke flue intercommunication, bypass heat exchanger shell side exit end passes through the furnace intercommunication of medium temperature furnace tobacco pipe and boiler. The utility model is used for improve boiler efficiency.
Description
Technical Field
The utility model relates to a coal-fired power generation field, concretely relates to be used for improving power plant unit efficiency waste heat absorption flue gas recirculation system.
Background
In a coal-fired power plant, the heat contained in the boiler exhaust gas accounts for 4% -8% of the fuel heat value, the problem of high boiler exhaust gas temperature is always a difficult problem, and the heat of the part is recovered, so that the boiler exhaust gas loss can be reduced. The main factor influencing the smoke discharge loss is the smoke discharge temperature, so that the boiler efficiency can be effectively improved by reducing the smoke discharge temperature, and the power generation heat efficiency of a power plant unit is further improved.
In conclusion, the existing boiler has the problems of high exhaust gas temperature, serious boiler exhaust gas loss and reduced boiler efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve current boiler and have the exhaust gas temperature height, the boiler loss of discharging fume is serious, reduces boiler efficiency's problem, and then provides one kind and is used for improving power plant unit efficiency waste heat absorption flue gas recirculation system.
The technical scheme of the utility model is that:
the utility model provides a waste heat absorption flue gas recirculation system for improving power plant unit efficiency, it includes bypass heat exchanger 1, flue gas recirculation fan 2, boiler 3, medium temperature furnace smoke pipeline 4, circulating fan export flue 5, circulating fan entry flue 6, bypass export flue 7, bypass entry flue 8, preheater entry flue 9, preheater exit flue 10, cold flue 11 and air heater 12, the entry end of air heater 12 flue side is through preheater entry flue 9 and boiler 3's exhanst gas outlet intercommunication, the exit end of air heater 12 flue side is through preheater exit flue 10 and cold flue 11 intercommunication, bypass heat exchanger 1 pipe side entry end is through bypass entry flue 8 and preheater entry flue 9 intercommunication, bypass heat exchanger 1 pipe side exit end is through bypass export flue 7 and preheater exit flue 10 intercommunication, bypass heat exchanger 1 shell side entry end is through circulating fan export 5 and flue gas recirculation fan 2 exit end intercommunication The inlet end of the flue gas recirculation fan 2 is communicated with the cold flue 11 through the inlet flue 6 of the recirculation fan, and the shell side outlet end of the bypass heat exchanger 1 is communicated with the hearth of the boiler 3 through the medium temperature furnace flue pipe 4.
Furthermore, the device also comprises a bypass flue adjusting baffle 13 and a main flue adjusting baffle 14, wherein the main flue adjusting baffle 14 is arranged inside the preheater inlet flue 9, and the bypass flue adjusting baffle 13 is arranged inside the bypass inlet flue 8.
Further, a main flue damper 14 is rotatably mounted on the inner wall of the preheater inlet flue 9.
Further, the angle between the main flue adjusting baffle 14 and the axis of the preheater inlet flue 9 is α, and α is 0-90 °.
Further, α is 30 °.
Further, a bypass flue adjusting damper 13 is rotatably mounted on the inner wall of the bypass inlet flue 8.
Further, the angle between the bypass flue adjusting baffle 13 and the axis of the bypass inlet flue 8 is β, and β is 0-90 °.
Further, β is 30 °.
Furthermore, the device also comprises a cold air inlet air duct 15 and a hot air outlet air duct 16, wherein the inlet end of the air side of the air preheater 12 is respectively communicated with a cold air channel of an external primary fan and a cold air channel of a secondary fan through the cold air inlet air duct 15, and the outlet end of the air side of the air preheater 12 is respectively communicated with a primary hot air channel of an external coal pulverizer and a secondary hot air channel of a burner through the hot air outlet air duct 16.
Further, the low-pressure economizer 17 is further included, the low-pressure economizer 17 is located between the cold smoke flue 11 and the preheater outlet flue 10, an inlet of the low-pressure economizer 17 is communicated with the preheater outlet flue 10, and an outlet of the low-pressure economizer 17 is communicated with the cold smoke flue 11.
Compared with the prior art, the utility model has the following effect:
1. the utility model is used for improve power plant's unit efficiency waste heat absorption flue gas recirculation system can realize improving combustion chamber temperature field, flow field to the control of combustion temperature, oxygen concentration to reach the purpose that reduces to discharge and improve combustion efficiency. The bypass heat exchanger is a device for exchanging heat, hot flue gas from a bypass inlet flue and cold flue gas from a circulating fan outlet flue exchange heat in the bypass heat exchanger to exchange heat, the temperature of the hot flue gas is reduced, and the hot flue gas enters a preheater inlet flue from the bypass outlet flue; the temperature of the cold flue gas rises and enters the boiler from the flue pipe of the medium temperature boiler.
2. Along with the increasing of the boiler capacity, the increasing of the parameters and the increasing of the complex arrangement of the heating surface, the flue gas recirculation can realize the control of the combustion temperature and the oxygen concentration, and improve the temperature field, the flow field and the like of the combustion chamber, thereby achieving the purposes of reducing the emission and improving the combustion efficiency.
3. The utility model is used for improve power plant's unit efficiency waste heat absorption flue gas recirculation system design simple, the small investment, operation convenient operation, have good economic benefits and market demand, the practicality is stronger simultaneously, and the prospect is very considerable, can improve power plant's operation economy effectively, has good application prospect.
4. The flue gas recirculation of the utility model is sent into the boiler body from the furnace bottom, the flue gas recirculation is increased according to the furnace bottom, and by carrying out the accounting, the investment of the flue gas recirculation can influence the change of the temperature of the flue gas at the bottom of the screen, thereby effectively controlling the temperature level of the furnace and inhibiting or preventing the coking of the furnace; the proper smoke recycling share is adopted, the temperature level of the smoke at the bottom of the screen is reduced along with the increase of the recycling smoke share, so that the radiation heat absorption capacity of a hearth and the retention time of the smoke in the hearth are reduced, and the overtemperature phenomenon of the heating surface of a superheater at the upper part of the hearth cannot be caused due to the fact that the temperature of the smoke is slightly reduced on the radiation heating surface arranged at the upper part of the hearth. Meanwhile, the temperature of the flue gas at the outlet of the hearth cannot be increased. As the flue gas flow at the convection heating surface is increased, the side heat release coefficient of the flue gas is increased, the convection heat transfer capacity is increased, the temperature of a working medium outlet is increased, and the change degree of the heating surface positioned at the downstream of the flue gas stroke is more obvious. When the recycling smoke rate is 20-25%, the steam temperature of the convection heating surface can be increased by 30-40 ℃. The higher flue gas temperature is beneficial to the stable combustion of the coal in the furnace, and has less influence on the temperature of the flue gas at the bottom of the screen. The smoke temperature of the smoke at the outlet of the bypass heat exchanger is above 350 ℃, the temperature difference with secondary air is small, and the smoke temperature is favorable for combustion in the furnace after operation. By adopting the arrangement form of the bypass flue, the arrangement can reduce the exhaust smoke of the boiler by 8-10 ℃, and improve the boiler efficiency by 0.3-0.5%.
Drawings
FIG. 1 is a schematic flow diagram of the utility model for improve power plant unit efficiency waste heat absorption flue gas recirculation system.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, and the waste heat absorption flue gas recirculation system for improving the efficiency of the power plant unit of the embodiment comprises a bypass heat exchanger 1, a flue gas recirculation fan 2, a boiler 3, a medium temperature furnace flue 4, a circulation fan outlet flue 5, a circulation fan inlet flue 6, a bypass outlet flue 7, a bypass inlet flue 8, a preheater inlet flue 9, a preheater outlet flue 10, a cold flue 11 and an air preheater 12, wherein the inlet end of the flue gas side of the air preheater 12 is communicated with the flue gas outlet of the boiler 3 through the preheater inlet flue 9, the outlet end of the flue gas side of the air preheater 12 is communicated with the cold flue 11 through the preheater outlet flue 10, the inlet end of the pipe side of the bypass heat exchanger 1 is communicated with the preheater inlet flue 9 through the bypass inlet flue 8, and the outlet end of the pipe side of the bypass heat exchanger 1 is communicated with the preheater outlet flue 10 through, the inlet end of the shell side of the bypass heat exchanger 1 is communicated with the outlet end of the flue gas recirculation fan 2 through an outlet flue 5 of the circulating fan, the inlet end of the flue gas recirculation fan 2 is communicated with a cold flue 11 through an inlet flue 6 of the circulating fan, and the outlet end of the shell side of the bypass heat exchanger 1 is communicated with a hearth of the boiler 3 through a medium temperature boiler flue pipe 4.
The second embodiment is as follows: the embodiment is described with reference to fig. 1, and the embodiment further includes a bypass flue adjusting damper 13 and a main flue adjusting damper 14, the main flue adjusting damper 14 is disposed inside the preheater inlet flue 9, and the bypass flue adjusting damper 13 is disposed inside the bypass inlet flue 8. So set up, adjust through bypass flue damper 13, main flue damper 14 and pass through the proportion of air heater 12 and bypass heat exchanger 1 by the produced flue gas of pulverized coal burning in boiler 3, reach the purpose that reduces exhaust gas temperature, improve boiler 3 efficiency. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: referring to fig. 1, the main flue damper 14 of the present embodiment is rotatably mounted on the inner wall of the preheater inlet flue 9. So arranged, the flue gas quantity of the flue gas generated by the pulverized coal combustion in the boiler 3 passing through the air preheater 12 is adjusted by the main flue adjusting damper 14. Other compositions and connections are the same as in the first or second embodiments.
The fourth concrete implementation mode: referring to fig. 1, the angle between the main flue damper 14 and the axis of the preheater inlet flue 9 is α, which is 0 to 90 °. Other compositions and connection relationships are the same as in the first, second or third embodiment.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 1, where α in the present embodiment is 30 °. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.
The sixth specific implementation mode: referring to fig. 1, the bypass flue damper 13 of the present embodiment is rotatably mounted on the inner wall of the bypass inlet flue 8. So set up, adjust the flue gas volume that the flue gas that the produced by pulverized coal burning passes through bypass heat exchanger 1 in boiler 3 through bypass flue adjusting damper 13. Other compositions and connection relationships are the same as in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: referring to fig. 1, the angle between the bypass flue damper 13 and the axis of the bypass inlet flue 8 is β, which is 0 to 90 °. Other compositions and connection relationships are the same as in the first, second, third, fourth, fifth or sixth embodiment.
The specific implementation mode is eight: the present embodiment will be described with reference to fig. 1, where β in the present embodiment is 30 °. Other compositions and connection relationships are the same as those of embodiment one, two, three, four, five, six or seven.
The specific implementation method nine: referring to fig. 1, the present embodiment further includes a cold air inlet duct 15 and a hot air outlet duct 16, the air inlet of the air preheater 12 is communicated with the cold air and cold air channels of the external primary air blower and the secondary air blower through the cold air inlet duct 15, and the air outlet of the air preheater 12 is communicated with the primary hot air channel of the external coal pulverizer and the secondary hot air channel of the burner through the hot air outlet duct 16. Other compositions and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh or eighth embodiment.
The detailed implementation mode is ten: the embodiment is described with reference to fig. 1, and the embodiment further includes a low-pressure economizer 17, the low-pressure economizer 17 is located between the cold smoke flue 11 and the preheater outlet flue 10, an inlet of the low-pressure economizer 17 is communicated with the preheater outlet flue 10, and an outlet of the low-pressure economizer 17 is communicated with the cold smoke flue 11. Other compositions and connection relationships are the same as those of embodiment one, two, three, four, five, six, seven, eight or nine.
Principle of operation
The utility model discloses a work flow for improving power plant unit efficiency waste heat absorption flue gas recirculation system is explained in combination with FIG. 1:
hot flue gas generated by pulverized coal combustion in the boiler 3 enters an air preheater 12 through a preheater inlet flue 9, meanwhile, a bypass inlet flue 8 is arranged on the preheater inlet flue 9 to bypass a part of flue gas (10% -20%) to a bypass heat exchanger 1 for heat exchange, cold flue gas extracted from a cold flue 11 enters the bypass heat exchanger 1 through a flue gas recirculation fan 2 to heat the cold flue gas, and then the cold flue gas is sent into a hearth of the boiler 3 through a medium-temperature boiler flue pipe. On one hand, the smoke volume passing through the air preheater 12 is reduced, the smoke temperature of the boiler 3 is reduced, and the efficiency of the boiler 3 is improved; on the other hand, cold flue gas enters a hearth of a boiler 3 after being subjected to heat exchange through the bypass heat exchanger 1, so that the combustion condition is changed, the NOx emission is reduced, the steam temperature is adjusted, and the absorption share of each heating surface is changed.
Claims (10)
1. The utility model provides a be used for improving power plant unit efficiency waste heat absorption flue gas recirculation system which characterized in that: it comprises a bypass heat exchanger (1), a flue gas recirculation fan (2), a boiler (3), a medium temperature furnace flue pipe (4), a circulating fan outlet flue (5), a circulating fan inlet flue (6), a bypass outlet flue (7), a bypass inlet flue (8), a preheater inlet flue (9), a preheater outlet flue (10), a cold flue (11) and an air preheater (12), wherein the inlet end of the flue gas side of the air preheater (12) is communicated with the flue gas outlet of the boiler (3) through the preheater inlet flue (9), the outlet end of the flue gas side of the air preheater (12) is communicated with the cold flue (11) through the preheater outlet flue (10), the inlet end of the pipe side of the bypass heat exchanger (1) is communicated with the preheater inlet flue (9) through the bypass inlet flue (8), the outlet end of the pipe side of the bypass heat exchanger (1) is communicated with the preheater outlet flue (10) through the bypass outlet flue (7), the shell side inlet end of the bypass heat exchanger (1) is communicated with the outlet end of the flue gas recirculation fan (2) through a circulating fan outlet flue (5), the inlet end of the flue gas recirculation fan (2) is communicated with a cold flue (11) through a circulating fan inlet flue (6), and the shell side outlet end of the bypass heat exchanger (1) is communicated with a hearth of the boiler (3) through a medium temperature furnace flue pipe (4).
2. The waste heat absorption flue gas recirculation system for improving the efficiency of a power plant unit according to claim 1, characterized in that: the novel preheater further comprises a bypass flue adjusting baffle (13) and a main flue adjusting baffle (14), wherein the main flue adjusting baffle (14) is arranged inside the preheater inlet flue (9), and the bypass flue adjusting baffle (13) is arranged inside the bypass inlet flue (8).
3. The waste heat absorption flue gas recirculation system for improving the efficiency of a power plant unit according to claim 1 or 2, characterized in that: the main flue adjusting baffle (14) is rotatably arranged on the inner wall of the inlet flue (9) of the preheater.
4. The waste heat absorption flue gas recirculation system for improving efficiency of a power plant unit according to claim 3, characterized in that: the angle between the main flue adjusting baffle (14) and the axis of the preheater inlet flue (9) is alpha, and alpha is 0-90 degrees.
5. The waste heat absorption flue gas recirculation system for improving efficiency of a power plant unit according to claim 4, characterized in that: α is 30 °.
6. The waste heat absorption flue gas recirculation system for improving the efficiency of a power plant unit according to claim 1 or 2, characterized in that: the bypass flue adjusting baffle (13) is rotatably arranged on the inner wall of the bypass inlet flue (8).
7. The waste heat absorption flue gas recirculation system for improving efficiency of a power plant unit of claim 6, wherein: the included angle between the bypass flue adjusting baffle (13) and the axis of the bypass inlet flue (8) is beta, and the beta is 0-90 degrees.
8. The waste heat absorption flue gas recirculation system for improving efficiency of a power plant unit of claim 7, wherein: β is 30 °.
9. The waste heat absorption flue gas recirculation system for improving the efficiency of a power plant unit according to claim 1, 5 or 8, characterized in that: the air preheater further comprises a cold air inlet air duct (15) and a hot air outlet air duct (16), wherein the inlet end of the air side of the air preheater (12) is respectively communicated with a cold air channel of an external primary air fan and a cold air channel of a secondary air fan through the cold air inlet air duct (15), and the outlet end of the air side of the air preheater (12) is respectively communicated with a primary hot air channel of an external coal pulverizer and a secondary hot air channel of a combustor through the hot air outlet air duct (16).
10. The waste heat absorption flue gas recirculation system for improving efficiency of a power plant unit of claim 9, wherein: the low-pressure economizer is characterized by further comprising a low-pressure economizer (17), wherein the low-pressure economizer (17) is located between the cold smoke flue (11) and the outlet flue (10) of the preheater, the inlet of the low-pressure economizer (17) is communicated with the outlet flue (10) of the preheater, and the outlet of the low-pressure economizer (17) is communicated with the cold smoke flue (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020088992.9U CN211502748U (en) | 2020-01-15 | 2020-01-15 | Waste heat absorption flue gas recirculation system for improving efficiency of power plant unit |
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| CN202020088992.9U CN211502748U (en) | 2020-01-15 | 2020-01-15 | Waste heat absorption flue gas recirculation system for improving efficiency of power plant unit |
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