CN216143761U - Heat exchange process system applied to deep utilization of flue gas waste heat - Google Patents
Heat exchange process system applied to deep utilization of flue gas waste heat Download PDFInfo
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- CN216143761U CN216143761U CN202120432116.8U CN202120432116U CN216143761U CN 216143761 U CN216143761 U CN 216143761U CN 202120432116 U CN202120432116 U CN 202120432116U CN 216143761 U CN216143761 U CN 216143761U
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model relates to a heat exchange process system applied to deep utilization of flue gas waste heat, which comprises a chimney, a tail flue of a waste heat boiler, a waste heat utilization flue, a plate heat exchanger, a flue gas condensation water tank and a heat pump unit, wherein the chimney is connected with the tail flue of the waste heat boiler; the lower inlet of the chimney is connected with a tail flue of the waste heat boiler, the horizontal outlet of the tail flue of the waste heat boiler is connected with a horizontal inlet pipeline of a waste heat utilization flue, and a plate heat exchanger is arranged on the horizontal inlet pipeline; the outlet pipeline of the waste heat utilization flue is connected to the upper section of the chimney; the plate heat exchanger comprises a water inlet at the top and a water outlet at the bottom, wherein the water inlet is connected with a water inlet pipeline, the water outlet is connected with a water outlet pipeline, and the water inlet pipeline and the water outlet pipeline are respectively connected with a heat pump unit. The utility model fully utilizes the waste heat of the flue gas, saves the field, shortens the length of the flue, and has less later maintenance and low manufacturing cost.
Description
Technical Field
The utility model relates to a novel heat exchange process system applied to deep utilization of flue gas waste heat of coal-fired power plants and gas-fired power plants.
Background
With the rapid development of economy in China, the demand of energy is increased rapidly, the problem of energy shortage is obvious day by day, the contradiction between energy supply and demand is prominent day by day, and the supply and demand gaps are increased year by year.
Currently, the main problems of low utilization efficiency, poor economic benefit and high ecological environment pressure still exist in the energy utilization of China, and the energy conservation, emission reduction, energy consumption reduction and energy comprehensive utilization rate improvement are important contents of energy development strategy planning and are fundamental ways for solving the energy problems of China.
The technology for utilizing the middle-high temperature waste heat in China gradually becomes mature, and the low-temperature flue gas waste heat is a large proportion of industrial waste heat resources and is not reasonably and effectively utilized. For coal-fired power plants and gas-steam combined cycle power plants, the discharged flue gas still has a large amount of resources for waste heat recovery and utilization. According to the relevant thermodynamic characteristics of the flue gas at different temperatures, the flue gas temperature is reduced through different heat exchange technologies, and the deep recycling technology of the waste heat in the flue gas is realized, which is proved to be feasible.
At present, projects related to deep utilization of flue gas waste heat are widely developed, some projects are already built, and some projects are in the implementation and early planning stages. In practical engineering application, equipment for realizing flue gas and intermediate circulating water exchange generally adopts a direct contact type spray tower, the spray tower equipment takes the project of a conventional 9F gas turbine as reference due to the existence of spray of each layer, the resistance of the heat exchanger is at least 1000Pa, meanwhile, the heat exchanger needs a special arrangement field, and the field generally has a certain distance from a chimney, so that the concentrated arrangement of waste heat utilization equipment and a system is not facilitated; although the heat exchange efficiency is higher, the heat exchanger has the characteristics of large occupied area, large resistance, long flue pipe path and the like, so that a larger field is needed, and a booster fan device for overcoming the resistance of the heat exchanger is additionally arranged. In the later water treatment stage, the direct spraying scheme adopts intermediate circulating water and flue gas condensate water to mix together, and the difficulty of dosing treatment is great, and the cost that produces from this is higher.
Therefore, how to overcome the defects of large occupied area, high resistance and the like of the direct contact spray tower scheme and ensure the deep utilization efficiency of the flue gas waste heat is a problem to be solved urgently in the deep utilization of the flue gas waste heat of the coal-fired power plant and the gas turbine power plant at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem of providing a heat exchange process system applied to deep utilization of flue gas waste heat.
The technical means adopted by the utility model are as follows: a heat exchange process system applied to deep utilization of flue gas waste heat is characterized by comprising a chimney, a tail flue of a waste heat boiler, a waste heat utilization flue, a plate heat exchanger, a flue gas condensate water tank and a heat pump unit; the bottom of the chimney is provided with a first smoke baffle door, an inlet below the chimney is connected with a tail flue of the waste heat boiler, a horizontal outlet of the tail flue of the waste heat boiler is connected with a horizontal inlet pipeline of a waste heat utilization flue, and a plate heat exchanger is arranged on the horizontal inlet pipeline; the outlet pipeline of the waste heat utilization flue is connected to the upper section of the chimney; the horizontal inlet pipeline is also provided with a second flue gas baffle door which is positioned at the upstream of the plate heat exchanger; the plate heat exchanger comprises a water inlet at the top and a water outlet at the bottom, wherein the water inlet is connected with a water inlet pipeline, the water outlet is connected with a water outlet pipeline, and the water inlet pipeline and the water outlet pipeline are respectively connected with a heat pump unit.
Preferably, a drain tank is arranged at the bottom of a downstream flue of the plate heat exchanger and connected with a flue gas condensate water tank, and a flue gas condensate water delivery pump is arranged on an outlet pipeline of the flue gas condensate water tank.
Preferably, the material of the heat exchange surface of the plate heat exchanger is 316L stainless steel.
Preferably, the waste heat utilization flue is made of stainless steel, glass fiber reinforced plastic or common carbon steel with an anticorrosive coating.
Preferably, the water outlet pipeline is provided with an intermediate water pump.
The utility model achieves the following beneficial effects.
Firstly, a plate heat exchanger is adopted for heat exchange, the resistance value is reduced to 300-400Pa, and the smoke resistance can be effectively reduced.
Secondly, the field can be saved. The length and the width of the plate type heat exchanger equipment are specially designed, and then the plate type heat exchanger equipment can be arranged beside a chimney, and the occupied area is small.
Thirdly, the length, the cost and the later maintenance of the flue can be saved. Because plate heat exchanger presses close to the chimney and arranges, boiler afterbody flue gas is through the plate heat exchanger heat transfer back, and the flue gas directly returns original chimney, so this scheme can significantly reduce for spray tower's heat exchanger, and the cost that produces from this reduces, and later maintenance volume also correspondingly reduces.
Fourthly, the original booster fan equipment can be omitted, and the maintenance quantity of the flue gas system and the booster fan is simplified. Because the resistance of the plate heat exchanger is reduced, the output effect of the combustion engine influenced by the increase of the exhaust pressure resistance of the combustion engine is weakened, and even if the booster fan is cancelled, the influence on the performance of the combustion engine is not great, so the booster fan can be cancelled.
Fifth, the water treatment system can be simplified. The plate heat exchanger is used as one of the dividing wall type heat exchangers, can separate intermediate circulating water and a flue gas condensate water system, and only needs to consider the dosing treatment of the flue gas condensate water in the actual operation.
Sixthly, industrial arrangement can be removed, and the visual effect is more attractive. Due to the utilization of the plate heat exchanger, the smoke equipment and the smoke system can be intensively arranged behind the chimney, the smoke channel and the chimney are also intensively arranged together, and the smoke system is compactly arranged.
Drawings
FIG. 1 is a flow diagram of a process system of the present invention.
FIG. 2 is a top view of the structure of the present invention.
Fig. 3 is a side view of the structure of the present invention.
Detailed Description
As shown in fig. 1 and 2, the heat exchange process system applied to deep utilization of flue gas waste heat of the utility model comprises a chimney 1, a tail flue 2 of a waste heat boiler, a waste heat utilization flue 3, a plate heat exchanger 4, a flue gas condensate water tank 5 and a heat pump unit 6.
The bottom of the chimney 1 is provided with a first flue gas baffle door 11, an inlet below the chimney 1 is connected with a tail flue 2 of the waste heat boiler, a horizontal outlet of the tail flue 2 of the waste heat boiler is connected with a horizontal inlet pipeline of a waste heat utilization flue 3, and the horizontal inlet pipeline is provided with a plate heat exchanger 4; the outlet pipeline of the residual heat utilization flue 3 is connected with the upper section of the chimney 1.
As shown in fig. 3, the horizontal inlet duct is also provided with a second flue gas damper door 31, which second flue gas damper door 31 is located upstream of the plate heat exchanger 4; the flue gas enters a chimney 1 through a tail flue 2 of the waste heat boiler, enters a horizontal inlet pipeline of a waste heat utilization flue 3 under the designed working condition, and returns to the chimney 1 through an outlet pipeline of the waste heat utilization flue 3 after heat exchange of a plate type heat exchanger 4; when the waste heat utilization system does not operate, the second flue gas baffle door 31 is closed and the first flue gas baffle door 11 is opened, and the flue gas is discharged from the chimney 1, so that the flue gas discharge points can be reduced. In a particular embodiment, the flow, direction, etc. of the flue gas may be adjusted or shut off by switching the first flue gas damper door 11, the second flue gas damper door 31. Meanwhile, a self-supporting chimney can be arranged at the outlet of the plate heat exchanger 4 according to the requirements in specific implementation, so that the problem of corrosion prevention of the original chimney and a chimney baffle door can be avoided by opening a hole in the original chimney.
The plate heat exchanger 4 comprises a water inlet 41 at the top and a water outlet 42 at the bottom, wherein the water inlet 41 is connected with a water inlet pipe 61, the water outlet 42 is connected with a water outlet pipe 62, and the water inlet pipe 61 and the water outlet pipe 62 are respectively connected with the heat pump unit 6. Steam from the turbine thermodynamic system drives the heat pump and connects heat pump set 6, and intermediary's circulating water passes through plate heat exchanger 4 heat transfer, and the heat transfer of the intermediary's circulating water after absorbing the flue gas heat gives the heat supply network circulating water, and the heat supply network circulating water is after having absorbed the heat of drive steam and intermediary's circulating water through heat pump set 6 heating simultaneously earlier, and after passing through the heat supply network heater secondary heating in the heat supply network station, finally supply to the heat consumer. The heat pump unit 6 is also connected with a drain tank, and medium circulating water after being absorbed enters the drain tank and enters a steam turbine condenser through a drain delivery pump.
Aiming at the characteristics of the plate heat exchanger 4, in order to optimize the operation condition of the heat pump unit, on the premise of meeting the requirement of waste heat extraction, the size of the plate heat exchanger 4 can be properly adjusted to adapt to the on-site arrangement condition in the specific embodiment, and meanwhile, the end difference and the equipment safety can be ensured. The water inlet and outlet of the plate heat exchanger 4 are intermediate circulating water which is closed circulating, and an alkali adding device or an ammonia adding device is additionally arranged in the specific embodiment in consideration of corrosion of the closed water to equipment pipelines and the like. Considering the corrosion of the flue gas and the flue gas condensate water to the heating surface of the plate heat exchanger, the material of the heat exchange surface of the plate heat exchanger 4 is 316L stainless steel.
The bottom of the downstream flue of the plate heat exchanger 4 is provided with a drain tank 51, the drain tank 51 is connected with a flue gas condensate water tank 5, and an outlet pipeline of the flue gas condensate water tank 5 is provided with a flue gas condensate water delivery pump 52. After the flue gas is cooled by the medium circulating water, the flue gas condensate water is deposited at the bottom of the flue at the downstream of the plate heat exchanger 4 in two modes of flowing automatically along the heat exchange plates or falling under the action of gravity, and the collected flue gas condensate water enters the flue gas condensate water tank 5 and enters the chemical treatment system through the flue gas condensate water delivery pump 52 to be recycled after being subjected to chemical dosing treatment.
Further, the waste heat utilization flue 3 is made of stainless steel, glass fiber reinforced plastic or common carbon steel with an anticorrosive coating.
Further, the water outlet pipe 62 is provided with an intermediate water pump 63.
The specific embodiment of the utility model is a single waste heat boiler, and can also be used for two furnaces or a plurality of waste heat boilers. When the waste heat utilization system is used for a plurality of waste heat boilers, the waste heat utilization arrangement structure at the tail part of a single boiler is unchanged, and unit system or main pipe system can be considered for the circulating water and the intermediate water system of the heat supply network.
Claims (5)
1. A heat exchange process system applied to deep utilization of flue gas waste heat is characterized by comprising a chimney (1), a waste heat boiler tail flue (2), a waste heat utilization flue (3), a plate heat exchanger (4), a flue gas condensate water tank (5) and a heat pump unit (6);
the bottom of the chimney (1) is provided with a first flue gas baffle door (11), an inlet below the chimney (1) is connected with a tail flue (2) of the waste heat boiler, a horizontal outlet of the tail flue (2) of the waste heat boiler is connected with a horizontal inlet pipeline of a waste heat utilization flue (3), a plate type heat exchanger (4) is arranged on the horizontal inlet pipeline, and an outlet pipeline of the waste heat utilization flue (3) is connected to the upper section of the chimney (1);
the horizontal inlet pipeline is also provided with a second flue gas baffle door (31), and the second flue gas baffle door (31) is positioned at the upstream of the plate type heat exchanger (4); the plate heat exchanger (4) comprises a water inlet (41) at the top and a water outlet (42) at the bottom, the water inlet (41) is connected with a water inlet pipeline (61), the water outlet (42) is connected with a water outlet pipeline (62), and the water inlet pipeline (61) and the water outlet pipeline (62) are respectively connected with a heat pump unit (6).
2. The heat exchange process system applied to deep utilization of the waste heat of the flue gas as claimed in claim 1, wherein a water drainage groove (51) is arranged at the bottom of a downstream flue of the plate heat exchanger (4), the water drainage groove (51) is connected with a flue gas condensate water tank (5), and a flue gas condensate water delivery pump (52) is arranged in an outlet pipeline of the flue gas condensate water tank (5).
3. The heat exchange process system applied to deep utilization of flue gas waste heat according to claim 1, wherein the material of the heat exchange surface of the plate heat exchanger (4) is 316L stainless steel.
4. The heat exchange process system applied to deep utilization of the waste heat of the flue gas as claimed in claim 1, wherein the waste heat utilization flue (3) is made of stainless steel, glass fiber reinforced plastic or common carbon steel with an anticorrosive coating.
5. The heat exchange process system applied to deep utilization of flue gas waste heat as claimed in claim 1, wherein the water outlet pipeline (62) is provided with an intermediate water pump (63).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120432116.8U CN216143761U (en) | 2021-02-26 | 2021-02-26 | Heat exchange process system applied to deep utilization of flue gas waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120432116.8U CN216143761U (en) | 2021-02-26 | 2021-02-26 | Heat exchange process system applied to deep utilization of flue gas waste heat |
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| Publication Number | Publication Date |
|---|---|
| CN216143761U true CN216143761U (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120432116.8U Active CN216143761U (en) | 2021-02-26 | 2021-02-26 | Heat exchange process system applied to deep utilization of flue gas waste heat |
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| CN (1) | CN216143761U (en) |
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2021
- 2021-02-26 CN CN202120432116.8U patent/CN216143761U/en active Active
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