CN210979902U - System for heating primary air, water supply and circulating water by using bypass flue gas - Google Patents
System for heating primary air, water supply and circulating water by using bypass flue gas Download PDFInfo
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- CN210979902U CN210979902U CN201922012111.5U CN201922012111U CN210979902U CN 210979902 U CN210979902 U CN 210979902U CN 201922012111 U CN201922012111 U CN 201922012111U CN 210979902 U CN210979902 U CN 210979902U
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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 discloses a system for heating primary air, water supply and circulating water by using bypass flue gas, wherein a hot flue gas outlet of a coal-fired boiler of the system is divided into a hot flue gas main path and a hot flue gas bypass; the hot flue gas main path is communicated with a flue gas chamber of the three-chamber preheater, and the flue gas chamber is communicated with the cold flue gas main path; a baffle door is arranged on the hot flue gas bypass and is sequentially communicated with a water supply heat exchanger, a high-temperature primary air heat exchanger, a circulating water heat exchanger of a fan heater and a low-temperature primary air heat exchanger; the low-temperature primary air heat exchanger is communicated with the cold flue gas bypass; wherein, the water supply heat exchanger is used for heating water, the low-temperature primary air heat exchanger and the high-temperature primary air heat exchanger are used for heating cold primary air, and the water pipe and the air heater circulating water heat exchanger are used for heating circulating water. The system utilizes the waste heat of the bypass flue gas to heat the feed water, the primary air and the circulating water at the same time, so that the utilization of the waste heat of the flue gas is greatly improved, and the system is more favorable for environmental protection, energy conservation and cost reduction.
Description
Technical Field
The utility model relates to a system especially relates to a system for utilize bypass flue gas heating primary air, feedwater and circulating water.
Background
The air preheater is one of the important components of the pulverized coal boiler system, and plays the roles of reducing the exhaust gas temperature, improving the temperature of air for combustion, enabling fuel to easily catch fire, enabling combustion to be stable and improving the combustion efficiency. The air preheater mainly comprises a trisection bin and a shell-and-tube type. At present, over 90 percent of coal-fired boilers of power stations adopt three-bin air preheaters, and hot flue gas, primary air and secondary air respectively circulate in three bins. In the existing pulverized coal boiler system, high-temperature flue gas generated by a coal-fired boiler is mainly sent into a three-bin air preheater to heat air for combustion (namely secondary air), and the heat of the high-temperature flue gas is sufficient for heating the secondary air, so that the energy is wasted; meanwhile, the flue gas waste heat of the bypass cannot be fully utilized in a gradient manner, so that energy waste is caused, environmental protection and energy conservation are not facilitated, a system capable of effectively heating primary air, water supply and circulating water of the air heater at the same time is not available, a large amount of energy is consumed to heat the primary air, the water supply and the circulating water of the air heater, and the operation cost is increased to a certain extent.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a system for heating primary air, water supply and circulating water by using bypass flue gas.
In order to solve the technical problem, the utility model discloses a technical scheme is: the system for heating primary air, water supply and circulating water by using bypass flue gas comprises a three-compartment preheater, a water supply heat exchanger, a high-temperature primary air heat exchanger, a circulating water heat exchanger of a fan heater, a low-temperature primary air heat exchanger and a fan heater;
the three-bin preheater is communicated with a coal-fired boiler, a hot flue gas outlet is arranged at the coal-fired boiler, and the hot flue gas outlet is divided into a hot flue gas main path and a hot flue gas bypass at the inlet of the three-bin preheater;
the interior of the three-bin preheater is provided with a primary air bin, a secondary air bin and a flue gas bin which are communicated with each other, the coal-fired boiler is communicated with the flue gas bins of the three-bin preheater through a hot flue gas main path, the flue gas bins are communicated with a cold flue gas main path, and the cold flue gas main path is communicated with a flue gas subsequent treatment device;
the hot flue gas bypass is provided with a baffle door which is communicated with the water supply heat exchanger, the baffle door is positioned between the hot flue gas bypass and the water supply heat exchanger, the high-temperature primary air heat exchanger, the air heater circulating water heat exchanger and the low-temperature primary air heat exchanger are communicated in sequence; the low-temperature primary air heat exchanger is communicated with a cold flue gas bypass, and the cold flue gas bypass is also communicated with a flue gas subsequent treatment device;
the water supply heat exchanger is communicated with a water supply pipe at one side and communicated with an economizer at the other side, and the water supply enters the economizer after being absorbed in the water supply heat exchanger; the low-temperature primary air heat exchanger is communicated with a cold primary air inlet pipe at one side and is communicated with a middle primary air pipe at the other side, the low-temperature primary air heat exchanger is communicated with the high-temperature primary air heat exchanger through the middle primary air pipe, and the high-temperature primary air heat exchanger is communicated with a hearth;
the circulating water inlet pipe of the air heater and the circulating water outlet pipe of the air heater are respectively communicated with the air heater; the hot air device is communicated with a cold secondary air inlet pipe at one side and a warm secondary air outlet pipe at the other side, the warm secondary air outlet pipe is divided into two paths, one path is communicated with the primary air chamber of the three-chamber preheater, the other path is communicated with the secondary air chamber of the three-chamber preheater, outlet pipes of the primary air chamber and the secondary air chamber are converged to form a hot secondary air outlet pipe, and the hot secondary air outlet pipe is also communicated with the hearth.
Furthermore, a shell-and-tube heat exchanger is adopted for both the high-temperature primary air heat exchanger and the low-temperature primary air heat exchanger.
Furthermore, the economizer and the hearth are both positioned at the coal-fired boiler.
The utility model discloses an utilize bypass flue gas heating primary air, system of feedwater and circulating water, this system utilizes bypass flue gas waste heat to heat primary air, feedwater and fan heater circulating water simultaneously, has realized the ladder utilization of flue gas waste heat, and the utilization of flue gas waste heat is improved by a wide margin, is favorable to environmental protection and energy saving more, simultaneously, has reduced the energy loss that heats primary air, feedwater and fan heater circulating water, has reduced pulverized coal fired boiler system's running cost to a certain extent.
Drawings
Fig. 1 is a schematic diagram of the system structure of the utility model for heating the primary air, the water supply and the circulating water by using the bypass flue gas.
In the figure: 1. a coal-fired boiler; 2. a hot flue gas bypass; 3. a hot flue gas main path; 4. a three-bin preheater; 5. a primary air plenum; 6. a secondary air chamber; 7. a flue gas chamber; 8. a hot secondary air outlet pipe; 9. a warm secondary air outlet pipe; 10. a cold flue gas main path; 11. a flapper door; 12. a feedwater heat exchanger; 13. a high-temperature primary air heat exchanger; 14. a circulating water heat exchanger of the air heater; 15. a low-temperature primary air heat exchanger; 16. a coal economizer; 17. a hearth; 18. SCR; 19. a circulating water outlet pipe of the air heater; 20. a cold primary air inlet pipe; 21. a cold flue gas bypass; 22. a warm air blower; 23. a cold secondary air inlet pipe; 24. a flue gas subsequent treatment device; 25. a circulating water outlet pipe of the air heater; 26. a middle primary air pipe; 27. a water supply pipe; 28. provided is a coal mill.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A system for heating primary air, water supply and circulating water by using bypass flue gas comprises a trisection bin preheater 4, a water supply heat exchanger 12, a high-temperature primary air heat exchanger 13, a circulating water heat exchanger 14 of a fan heater, a low-temperature primary air heat exchanger 15 and a fan heater 22 as shown in figure 1.
The utility model discloses a system for heating primary air, water supply and circulating water by using bypass flue gas is built on the basis of the existing pulverized coal boiler system, wherein, a three-compartment preheater 4 is communicated with a coal-fired boiler 1, the coal-fired boiler 1 is provided with an SCR18, hot flue gas at the outlet of an SCR18 is divided into a hot flue gas main path 3 and a hot flue gas bypass 2 at the inlet of the three-compartment preheater 4; and a primary air chamber 5, a secondary air chamber 6 and a flue gas chamber 7 which are communicated with each other are arranged in the three-chamber preheater 4.
For the main hot flue gas path 3, the main hot flue gas path is communicated with the flue gas chambers 7 of the three-chamber preheater 4, the flue gas chambers 7 are communicated with the main cold flue gas path 10, therefore, hot flue gas flowing through the main hot flue gas path 3 is changed into main cold flue gas after heat release in the flue gas chambers 7, the main cold flue gas enters the main cold flue gas path 10, the main cold flue gas path 10 is communicated with the flue gas post-processing device 24, the main cold flue gas is subjected to post-processing by the flue gas post-processing device 24, and safe emission of the flue gas is realized. The heat of the hot flue gas released in the flue gas chamber 7 is circulated to the secondary air chamber 6 and the primary air chamber 5 to heat the entering secondary air, and high-temperature outlet hot secondary air is obtained.
For the hot flue gas bypass 3, in order to realize the sufficient ladder utilization of the waste heat of the bypass flue gas, firstly, a baffle door 11 is installed on the hot flue gas bypass 3, and the flue gas quantity of the circulating hot flue gas bypass 3 is adjusted through the baffle door 11. Meanwhile, the hot flue gas bypass 3 is communicated with a water supply heat exchanger 12, a baffle door 11 is positioned between the hot flue gas bypass 3 and the water supply heat exchanger 12, the high-temperature primary air heat exchanger 13, the air heater circulating water heat exchanger 14 and the low-temperature primary air heat exchanger 15 are sequentially communicated, so that hot flue gas flowing through the hot flue gas bypass 3 sequentially passes through the water supply heat exchanger 12, the high-temperature primary air heat exchanger 13, the air heater circulating water heat exchanger 14 and the low-temperature primary air heat exchanger 15 after the ventilation quantity is adjusted through the baffle door 11 and releases heat, and the released heat is used as a heating medium for heating a refrigerant by each heat.
The water supply heat exchanger 12 is communicated with a water supply pipe 27 on one side and communicated with the economizer 16 on the other side, so that heat emitted by bypass flue gas flowing through the water supply heat exchanger 12 is used for heating water, the water supply enters the economizer 16 for continuous heating after being absorbed in the water supply heat exchanger 12, and therefore the waste heat of the bypass flue gas is used for heating the water supply, and the energy loss of the economizer 16 for heating the water supply is reduced.
The low-temperature primary air heat exchanger 15 is communicated with a cold primary air inlet pipe 20 at one side and is communicated with an intermediate primary air pipe 26 at the other side, the low-temperature primary air heat exchanger 15 is communicated with the high-temperature primary air heat exchanger 13 through the intermediate primary air pipe 26, and the high-temperature primary air heat exchanger 13 is communicated with a hearth 17, so that cold primary air firstly absorbs heat through the low-temperature primary air heat exchanger 15 to become intermediate primary air, then enters the high-temperature primary air heat exchanger 13 through the intermediate primary air pipe 26 to continuously absorb heat and heat up to become hot primary air, and finally heated hot primary air conveys heated pulverized coal and enters a coal mill 28; therefore, the waste heat of the bypass flue gas is utilized to heat the primary air, so that the energy loss of heating the primary air is reduced; moreover, the low-temperature primary air heat exchanger 15 and the high-temperature primary air heat exchanger 13 are adopted to exchange heat for the primary air for two times so as to ensure that the temperature of the primary air reaches the use requirement, and meanwhile, the high-temperature primary air heat exchanger 13 and the low-temperature primary air heat exchanger 15 both adopt shell-and-tube heat exchangers so as to ensure the heat exchange efficiency.
The circulating water inlet pipe 19 of the air heater and the circulating water outlet pipe 25 of the air heater are respectively communicated with the air heater 22; the temperature of the circulating water after heat exchange in the air heater 22 is reduced, the circulating water enters the air heater circulating water heat exchanger 14 through the air heater circulating water inlet pipe 19 and is heated by using the waste heat of the flue gas, and then the heating medium (namely the heated circulating water) is continuously provided for the air heater 22 through the air heater circulating water outlet pipe 25, so that the circulating water of the air heater is heated by using the waste heat of the flue gas, and the energy loss of heating the circulating water of the air heater is reduced;
the air heater 22 is mainly used for primarily heating cold secondary air, one side of the air heater 22 is communicated with a cold secondary air inlet pipe 23, the other side of the air heater 22 is communicated with a warm secondary air outlet pipe 9, the cold secondary air enters the heat exchanger 22 through the cold secondary air inlet pipe 23 and exchanges heat with heated circulating water, and the cold secondary air is changed into warm secondary air and flows into the warm secondary air outlet pipe 9; the warm secondary air outlet pipe 9 is divided into two paths, one path is communicated with the primary air chamber 5 of the three-chamber preheater 4, the other path is communicated with the secondary air chamber 6 of the three-chamber preheater 4, the outlet pipes of the primary air chamber 5 and the secondary air chamber 6 are converged to form the warm secondary air outlet pipe 8, and the warm secondary air outlet pipe 8 is also communicated with the hearth 17, so that the warm secondary air is respectively heated by the primary air chamber 5 and the secondary air chamber 6 and then converged into outlet hot secondary air which enters the hearth 17 through the hot secondary air outlet pipe 8, the hot secondary air is high-temperature air, and is matched with the primary air to stir and mix pulverized coal, thereby providing the air quantity required by pulverized coal combustion.
Finally, the bypass flue gas carries out ladder heating to feedwater, primary air, fan heater circulating water, realizes the make full use of bypass flue gas waste heat, and the bypass flue gas after exothermic then becomes bypass cold flue gas, and the cold flue gas of bypass gets into cold flue gas bypass 21 in, because cold flue gas bypass 21 also is linked together with flue gas follow-up treatment device 24, the cold flue gas of bypass finally gets into and carries out the subsequent processing in flue gas follow-up treatment device 24, realizes safe emission.
In addition, the coal economizer 16 and the hearth 17 are both positioned at the coal-fired boiler 1, so that the pulverized coal boiler system can normally operate.
The utility model discloses an utilize bypass flue gas heating primary air, system of feedwater and circulating water, its specific heating method as follows:
high-temperature hot flue gas generated by the coal-fired boiler 1 is divided into two paths, wherein one path enters a hot flue gas main path 3, and the other path enters a hot flue gas bypass 2; the hot flue gas entering the hot flue gas main path 3 flows through a flue gas chamber 7 of a trisection bin preheater 4 to release heat and is changed into main path cold flue gas, the released heat enters a secondary air chamber 6 and a primary air chamber 5, the main path cold flue gas flows through a cold flue gas main path 10 and then enters a flue gas post-processing device 24, and the flue gas post-processing device 24 performs post-processing;
the hot flue gas entering the hot flue gas bypass 2 is subjected to flux adjustment through a baffle door 11, and passes through a water supply heat exchanger 12, a high-temperature primary air heat exchanger 13, a fan heater circulating water heat exchanger 14 and a low-temperature primary air heat exchanger 15 in sequence to release heat, and then enters a cold flue gas bypass 21 to become bypass cold flue gas, and the bypass cold flue gas also enters a flue gas post-treatment device 24 to be subjected to post-treatment through the flue gas post-treatment device 24;
when hot flue gas of the hot flue gas bypass 2 flows through the water supply heat exchanger 12, water supply is introduced into the water supply heat exchanger 12 through the water supply pipe 27, the water supply absorbs heat and then enters the economizer 16, and the economizer 16 continues to heat the water supply;
when hot flue gas of the hot flue gas bypass 2 flows through the high-temperature primary air heat exchanger 13 and the low-temperature primary air heat exchanger 15, cold primary air firstly flows into the low-temperature primary air heat exchanger 15 through the cold primary air inlet pipe 20, the cold primary air absorbs heat in the low-temperature primary air heat exchanger 15 and then enters the intermediate primary air pipe 26 to become intermediate primary air, the intermediate primary air continuously flows into the high-temperature primary air heat exchanger 13 to further absorb heat and raise temperature to become hot primary air, and the hot primary air finally enters the coal mill 28;
when hot flue gas of the hot flue gas bypass 2 flows through the circulating water heat exchanger 14 of the air heater, cold secondary air enters the air heater 22 through the cold secondary air inlet pipe 23, the circulating water heat exchanger 14 of the air heater provides heat medium for the air heater 22 through the circulating water outlet pipe 25 of the air heater, the cold secondary air is heated by the heat medium in the air heater 22 to become hot secondary air, the heat medium after heat exchange continuously enters the circulating water heat exchanger 14 of the air heater through the circulating water outlet pipe 19 of the air heater to absorb heat, and therefore the heat medium is continuously provided for the air heater 22; meanwhile, the warm secondary air flows into the primary air chamber 5 and the secondary air chamber 6 respectively through the warm secondary air outlet pipe 9 to be reheated, and then is converged at the hot secondary outlet pipe 8 to form outlet hot secondary air, and the outlet hot secondary air is discharged into the hearth 17 through the hot secondary outlet pipe 8.
The utility model discloses a system for utilize bypass flue gas heating primary air, feedwater and circulating water utilizes bypass flue gas waste heat to heat primary air, feedwater and air heater circulating water simultaneously, has realized the ladder utilization of flue gas waste heat, and flue gas waste heat's utilization is improved by a wide margin, is favorable to environmental protection and energy saving more, simultaneously, has reduced the energy loss that heats primary air, feedwater and air heater circulating water, has reduced pulverized coal fired boiler system's running cost to a certain extent.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and the technical personnel in the technical field are in the present invention, which can also belong to the protection scope of the present invention.
Claims (3)
1. Utilize bypass flue gas heating primary air, feedwater and circulating water's system, including three fens storehouse pre-heaters (4), its characterized in that: the air conditioner also comprises a water supply heat exchanger (12), a high-temperature primary air heat exchanger (13), a circulating water heat exchanger (14) of the air heater, a low-temperature primary air heat exchanger (15) and an air heater (22);
the three-bin preheater (4) is communicated with the coal-fired boiler (1), a hot flue gas outlet (18) is arranged at the coal-fired boiler (1), and the hot flue gas outlet (18) is divided into a hot flue gas main path (3) and a hot flue gas bypass path (2) at the inlet of the three-bin preheater (4);
a primary air chamber (5), a secondary air chamber (6) and a flue gas chamber (7) which are communicated with each other are arranged inside the trisection preheater (4), the coal-fired boiler (1) is communicated with the flue gas chamber (7) of the trisection preheater (4) through a hot flue gas main path (3), the flue gas chamber (7) is communicated with a cold flue gas main path (10), and the cold flue gas main path (10) is communicated with a flue gas subsequent treatment device (24);
the hot flue gas bypass (2) is provided with a baffle door (11), the hot flue gas bypass (2) is communicated with a water supply heat exchanger (12), the baffle door (11) is positioned between the hot flue gas bypass (2) and the water supply heat exchanger (12), the high-temperature primary air heat exchanger (13), the air heater circulating water heat exchanger (14) and the low-temperature primary air heat exchanger (15) are communicated in sequence; the low-temperature primary air heat exchanger (15) is communicated with a cold flue gas bypass (21), and the cold flue gas bypass (21) is also communicated with a flue gas subsequent treatment device (24);
the feed water heat exchanger (12) is communicated with a feed water pipe (27) at one side and communicated with an economizer (16) at the other side, and feed water enters the economizer (16) after being absorbed in the feed water heat exchanger (12); the low-temperature primary air heat exchanger (15) is communicated with a cold primary air inlet pipe (20) at one side and is communicated with a middle primary air pipe (26) at the other side, the low-temperature primary air heat exchanger (15) is communicated with the high-temperature primary air heat exchanger (13) through the middle primary air pipe (26), and the high-temperature primary air heat exchanger (13) is communicated with a coal mill (28);
the circulating water inlet pipe (19) of the air heater and the circulating water outlet pipe (25) of the air heater are respectively communicated with the air heater (22); warm braw ware (22) have cold overgrate air import pipe (23) in one side intercommunication, have warm overgrate air outlet pipe (9) in the opposite side intercommunication, warm overgrate air outlet pipe (9) divide into two the tunnel, are linked together with one time wind bin (5) of three minutes storehouse preheaters (4) all the way, and another way is linked together with overgrate air bin (6) of three minutes storehouse preheaters (4), the outlet pipe of one time wind bin (5), overgrate air bin (6) joins mutually and forms heat overgrate air outlet pipe (8), and hot overgrate air outlet pipe (8) also are linked together with furnace (17).
2. The system for heating primary air, feed water and circulating water by using bypass flue gas as claimed in claim 1, wherein: and the high-temperature primary air heat exchanger (13) and the low-temperature primary air heat exchanger (15) both adopt shell-and-tube heat exchangers.
3. The system for heating primary air, feed water and circulating water by using bypass flue gas as claimed in claim 1, wherein: the coal economizer (16) and the hearth (17) are both positioned at the position of the coal-fired boiler (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922012111.5U CN210979902U (en) | 2019-11-20 | 2019-11-20 | System for heating primary air, water supply and circulating water by using bypass flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922012111.5U CN210979902U (en) | 2019-11-20 | 2019-11-20 | System for heating primary air, water supply and circulating water by using bypass flue gas |
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| CN210979902U true CN210979902U (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922012111.5U Active CN210979902U (en) | 2019-11-20 | 2019-11-20 | System for heating primary air, water supply and circulating water by using bypass flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779036A (en) * | 2019-11-20 | 2020-02-11 | 江苏慧峰仁和环保科技有限公司 | System and method for heating primary air, water supply and circulating water by using bypass flue gas |
| CN112503556A (en) * | 2020-12-02 | 2021-03-16 | 大唐环境产业集团股份有限公司 | Flue gas waste heat recovery device of thermal power generating unit boiler |
-
2019
- 2019-11-20 CN CN201922012111.5U patent/CN210979902U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779036A (en) * | 2019-11-20 | 2020-02-11 | 江苏慧峰仁和环保科技有限公司 | System and method for heating primary air, water supply and circulating water by using bypass flue gas |
| CN112503556A (en) * | 2020-12-02 | 2021-03-16 | 大唐环境产业集团股份有限公司 | Flue gas waste heat recovery device of thermal power generating unit boiler |
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