CN213746689U - Flue gas degree of depth waste heat utilization equipment of thermal power plant - Google Patents
Flue gas degree of depth waste heat utilization equipment of thermal power plant Download PDFInfo
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- CN213746689U CN213746689U CN202022723275.1U CN202022723275U CN213746689U CN 213746689 U CN213746689 U CN 213746689U CN 202022723275 U CN202022723275 U CN 202022723275U CN 213746689 U CN213746689 U CN 213746689U
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Abstract
The utility model discloses a flue gas degree of depth waste heat utilization equipment of thermal power plant, including flue gas pipeline, fixed block, fastening bolt and fan, flue gas pipeline's rear is connected with first economizer, the both sides position of first economizer is provided with air heater, first economizer is provided with the connecting block with the top of second economizer, the side of first economizer and second economizer is provided with inlet tube and outlet pipe, the front end of apron is provided with the fixed block, the end of fixed block is provided with fastening bolt, the inside of apron is provided with the fan. The conventional waste heat utilization system of the deep waste heat utilization device for flue gas of the thermal power plant is mainly limited in that the temperature of the flue gas which can be utilized is low and is only 131-115 ℃, only the low-temperature condensed water can be heated, and the energy-saving effect is limited. This flue gas degree of depth waste heat utilization system utilizes 372 ~ 115 ℃'s flue gas to participate in the cigarette water heat transfer, and the cigarette temperature utilization range obtains promoting, and then has increased unit heat-work conversion efficiency by a wide margin.
Description
Technical Field
The utility model relates to a flue gas waste heat utilization technical field of thermal power plant specifically is a flue gas degree of depth waste heat utilization equipment of thermal power plant.
Background
The flue gas heat loss is the most important heat loss in the boiler operation, and is generally about 5% -12% accounting for 60% -70% of the boiler heat loss. Therefore, the reduction of the exhaust gas temperature has important practical significance for saving fuel and reducing pollution, in order to reduce the exhaust gas temperature and reduce exhaust gas loss, the research relies on the actual engineering to provide a flue gas waste heat deep utilization method suitable for engineering design according to the characteristics of coal quality, flue gas conditions, a thermodynamic system and the like, an air preheater bypass system is additionally arranged, and the design of a low-temperature economizer is combined to achieve the purpose of waste heat utilization, so that the technical index, the emission index and the economic index of a unit are improved.
The problems of low exhaust gas temperature, severe corrosion of the tail heating surface and the like existing in the actual operation of a power station boiler obviously restrict the energy-saving benefit of a low-temperature economizer system in the waste heat utilization process, so that the finding of a low-temperature flue gas waste heat recovery mode with low cost and high benefit has great significance for deep energy conservation of a power station.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a flue gas degree of depth waste heat utilization equipment of thermal power plant to solve the lower and afterbody of the exhaust gas temperature that power plant boiler that the above-mentioned background art provided exists in the actual motion and receive the problem that the surface corrodes more serious scheduling problem and has all obviously restricted the problem of the energy-conserving income of low temperature economizer system at the waste heat utilization in-process.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a flue gas degree of depth waste heat utilization equipment of thermal power plant, includes flue gas pipeline, fixed block, fastening bolt and fan, flue gas pipeline's rear is connected with first economizer, the both sides position of first economizer is provided with air heater, air heater enough puts and is provided with the second economizer, the end-to-end connection of second economizer has the electrostatic precipitator, all be connected with flue gas pipeline between first economizer, air heater, second economizer and the electrostatic precipitator, air heater's left side is provided with the forced draught blower, air heater's right side is provided with the electric fan heater, the inside of flue gas pipeline front end is provided with first filter screen, the inside of first filter screen is provided with the second filter screen, and the inside of second filter screen is provided with adsorbs cloth, the end of first filter screen is provided with the handle, the inside of first economizer and second economizer all is provided with conduit, the improved coal economizer is characterized in that a connecting block is arranged above the first coal economizer and the second coal economizer, a water inlet pipe and a water outlet pipe are arranged on the side faces of the first coal economizer and the second coal economizer, a cover plate is arranged on the surface of a flue gas pipeline between the first coal economizer and the air preheater, a rotating shaft is arranged at the front end of the cover plate, a fixing block is arranged at the front end of the cover plate, a fastening bolt is arranged at the tail end of the fixing block, and a fan is arranged inside the cover plate.
Preferably, an integrated structure is formed among the flue gas pipeline, the first economizer, the air preheater, the second economizer and the electric dust remover.
Preferably, the second economizer, the blower and the fan heater form a closed cycle.
Preferably, for cup jointing between first filter screen and the second filter screen, the fine degree of first filter screen is greater than the second filter screen, the second filter screen is hollow structure, and second filter screen hollow structure's overall dimension equals with the size of adsorbing cloth.
Preferably, the material of the adsorption cloth is activated carbon.
Preferably, the cover plate is of a hollow structure, the cover plate and the flue gas pipeline form an overturning structure through a rotating shaft, the cover plate is fixedly connected with a fan, and the fixing block is in threaded connection with the fastening bolt.
Compared with the prior art, the beneficial effects of the utility model are that: this flue gas degree of depth waste heat utilization equipment of thermal power plant:
(1) the main limitation of the conventional waste heat utilization system is that the temperature of the smoke which can be utilized is low and is only 131-115 ℃, only the low-temperature condensed water can be heated, and the energy-saving effect is limited. This flue gas degree of depth waste heat utilization system utilizes 372 ~ 115 ℃'s flue gas to participate in the cigarette water heat transfer, and the cigarette temperature utilization range obtains promoting, and then has increased unit heat-work conversion efficiency by a wide margin.
(2) Compared with a conventional waste heat utilization system, the deep flue gas waste heat utilization system can better realize scientific energy utilization of 'temperature opening alignment and gradient utilization', the energy level grade of flue gas introduced into the regenerative system is improved, and the regenerative system is introduced to heat feed water and high-temperature condensed water.
(3) The low-temperature economizer, the primary fan and the blower fan heater form closed circulation, the air temperature at the inlet of the air preheater is increased, low-temperature corrosion and ash blockage at the cold end of the air preheater can be improved, the deposition point of ammonium bisulfate moves down, purging of the soot blower is facilitated, and the closed circulation type low-temperature economizer, the primary fan and the blower fan heater are significant in improving safety and economical efficiency of a unit.
(4) The low-temperature economizer is arranged in front of the electric dust collector, on one hand, the temperature of flue gas at the inlet of the electric dust collector can be reduced to be below an acid dew point, water vapor and other chemical conductive substances are adsorbed on the surface of dust to form a conductive film, the specific resistance of fly ash is reduced to be below 109 (omega cm) from 1011 (omega cm) or more, the specific resistance of fly ash enters a range most suitable for electric dust collection, and the efficiency of the electrostatic dust collector is greatly improved. On the other hand, the temperature of the flue gas is reduced before the flue gas enters the dust remover, so that the flow rate of the flue gas is correspondingly reduced, the retention time in the electric dust remover is increased, the electric dust remover can capture the smoke dust more effectively, and the higher dust removal efficiency is achieved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the closed cycle structure of the present invention;
FIG. 3 is a schematic side view of the first economizer of the present invention;
fig. 4 is a schematic structural view of a first economizer of the present invention;
FIG. 5 is a schematic view of the structure at A in FIG. 1 according to the present invention;
FIG. 6 is a schematic cross-sectional view of the first filter screen of the present invention;
fig. 7 is a schematic structural diagram of the point B in fig. 1 according to the present invention.
In the figure: 1. a flue gas duct; 2. a first economizer; 3. an air preheater; 4. a second economizer; 5. an electric dust collector; 6. a blower; 7. a warm air blower; 8. a first filter screen; 9. a second filter screen; 10. adsorbing cloth; 11. a handle; 12. a water delivery pipeline; 13. connecting blocks; 14. a water inlet pipe; 15. a water outlet pipe; 16. a cover plate; 17. a rotating shaft; 18. a fixed block; 19. fastening a bolt; 20. a fan.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: a flue gas deep waste heat utilization device of a thermal power plant comprises a flue gas pipeline 1, a first coal economizer 2, an air preheater 3, a second coal economizer 4, an electric dust remover 5, a blower 6, a fan heater 7, a first filter screen 8, a second filter screen 9, adsorption cloth 10, a handle 11, a water conveying pipeline 12, a connecting block 13, a water inlet pipe 14, a water outlet pipe 15, a cover plate 16, a rotating shaft 17, a fixing block 18, a fastening bolt 19 and a fan 20, wherein the rear part of the flue gas pipeline 1 is connected with the first coal economizer 2, the air preheaters 3 are arranged on two sides of the first coal economizer 2, the second coal economizer 4 is arranged on the air preheater 3 in a sufficient placement manner, the electric dust remover 5 is connected with the tail end of the second coal economizer 4, the first coal economizer 2, the air preheaters 3, the flue gas pipeline 1 is connected between the second coal economizer 4 and the electric dust remover 5, the blower 6 is arranged on the left side of the air preheater 3, the right side of the air preheater 3 is provided with a fan heater 7, the inside of the front end of the flue gas pipeline 1 is provided with a first filter screen 8, the inside of the first filter screen 8 is provided with a second filter screen 9, the inside of the second filter screen 9 is provided with an adsorption cloth 10, the tail end of the first filter screen 8 is provided with a handle 11, the inside of the first economizer 2 and the inside of the second economizer 4 are both provided with a water conveying pipeline 12, a connecting block 13 is arranged above the first economizer 2 and the second economizer 4, the side surfaces of the first economizer 2 and the second economizer 4 are provided with a water inlet pipe 14 and a water outlet pipe 15, the surface of the flue gas pipeline 1 between the first economizer 2 and the air preheater 3 is provided with a cover plate 16, the front end of the cover plate 16 is provided with a rotating shaft 17, the front end of the cover plate 16 is provided with a fixing block 18, the tail end of the fixing block 18 is provided with a fastening bolt 19, and the inside of the cover plate 16 is provided with a fan 20.
An integrated structure is formed among the flue gas pipeline 1, the first coal economizer 2, the air preheater 3, the second coal economizer 4 and the electric dust remover 5.
The second economizer 4, the blower 6 and the fan heater 7 form closed circulation to better absorb heat.
For cup jointing between first filter screen 8 and the second filter screen 9, first filter screen 8's fine and close degree is greater than second filter screen 9, and second filter screen 9 is hollow structure, and second filter screen 8 hollow structure's shape size equals with the size of adsorbing cloth 10, makes the impurity in the flue gas reduce, avoids remaining inside flue gas pipeline 1.
The material of the adsorption cloth 10 is activated carbon.
The cover plate 16 is of a hollow structure, the cover plate 16 and the flue gas pipeline 1 form a turnover structure through the rotating shaft 17, the fan 20 is fixedly connected inside the cover plate 16, and the fixing block 18 and the fastening bolt 19 are in threaded connection, so that the flue gas pipeline 1 is convenient to clean.
The working principle is as follows: when the device for deeply utilizing the waste heat of the flue gas of the thermal power plant is used, the bypass system of the air preheater 3 is put into operation, part of the flue gas enters the bypass flue of the air preheater 3, the first economizer 2 with the first-stage high-pressure bypass and the second-stage low-pressure bypass of the air preheater 3 in the heating flue is a flue gas-water heat exchanger, the system medium of the first economizer 2 with the high-pressure bypass is from high-pressure feed water, the system medium of the first economizer 2 with the low-pressure bypass is from condensed water, finally the flue gas flowing through the air preheater 3 is mixed with the flue gas on the outlet flue of the air preheater 3, the second economizer 4 is arranged at the inlet of the electric dust collector 5, the second economizer 4, the blower 6 and the fan heater 7 form closed circulation, the recovered heat heats cold air through circulating water, thereby realizing that the boiler feed water and the condensed water are preferentially heated by the high-temperature flue gas, high-quality steam is squeezed, the steam work is increased, and the second 4 economizer can not only heat the boiler cold air, improve 3 entry wind temperature of air heater in order to improve 3 cold junction low temperature corrosions of air heater, can reduce 5 entry flue gas temperatures of electrostatic precipitator moreover to 90 ℃, realize low temperature electrostatic precipitations, improve 6 efficiencies of electrostatic precipitator.
When the flue gas duct 1 needs to be cleaned, the fastening bolt 19 is removed, then the cover plate 16 on the flue gas duct 1 is turned over by the rotating shaft 17, the fan 20 is started, then the cover plate 16 is closed, and the cover plate 16 is arranged on each flue gas pipeline 1, the air generated by the fan 20 blows the impurities remained in the flue gas pipeline 1 out of the flue gas pipeline 1, when the device is operated, the first filter screen 8, the second filter screen 9 and the adsorption cloth 10 in the front end of the flue gas pipeline 1 initially filter the flue gas, when the adsorption cloth 10 needs to be read for replacement, the first filter screen 8 is drawn out through the handle 11, and the adsorption cloth 10 is drawn out from the inside of the second filter screen 9 for replacement, the above is the operation process of the device, and the details which are not described in detail in this specification, such as the first economizer 2, the second economizer 4, etc., are all the prior art known to those skilled in the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a flue gas degree of depth waste heat utilization equipment of thermal power plant, includes flue gas pipeline (1), fixed block (18), fastening bolt (19) and fan (20), its characterized in that: the rear of the flue gas pipeline (1) is connected with a first economizer (2), the two side positions of the first economizer (2) are provided with air preheaters (3), enough of the air preheaters (3) are provided with second economizers (4), the tail ends of the second economizers (4) are connected with electric dust collectors (5), flue gas pipelines (1) are connected among the first economizers (2), the air preheaters (3), the second economizers (4) and the electric dust collectors (5), a blower (6) is arranged on the left side of the air preheaters (3), a fan heater (7) is arranged on the right side of the air preheaters (3), a first filter screen (8) is arranged inside the front end of the flue gas pipeline (1), a second filter screen (9) is arranged inside the first filter screen (8), and adsorption cloth (10) is arranged inside the second filter screen (9), the end of first filter screen (8) is provided with handle (11), the inside of first economizer (2) and second economizer (4) all is provided with conduit (12), the top of first economizer (2) and second economizer (4) is provided with connecting block (13), the side of first economizer (2) and second economizer (4) is provided with inlet tube (14) and outlet pipe (15), the surface of flue gas pipeline (1) between first economizer (2) and air heater (3) is provided with apron (16), the front end of apron (16) is provided with rotation axis (17), the front end of apron (16) is provided with fixed block (18), the end of fixed block (18) is provided with fastening bolt (19), the inside of apron (16) is provided with fan (20).
2. The deep waste heat utilization device for flue gas of a thermal power plant according to claim 1, characterized in that: an integrated structure is formed between the flue gas pipeline (1) and the first coal economizer (2), the air preheater (3), the second coal economizer (4) and the electric dust remover (5).
3. The deep waste heat utilization device for flue gas of a thermal power plant according to claim 1, characterized in that: the second economizer (4), the blower (6) and the fan heater (7) form closed circulation.
4. The deep waste heat utilization device for flue gas of a thermal power plant according to claim 1, characterized in that: for cup jointing between first filter screen (8) and second filter screen (9), the fine degree of first filter screen (8) is greater than second filter screen (9), second filter screen (9) are hollow structure, and second filter screen (9) hollow structure's shape size equals with the size of adsorbing cloth (10).
5. The deep waste heat utilization device for flue gas of a thermal power plant according to claim 1, characterized in that: the material of the adsorption cloth (10) is activated carbon.
6. The deep waste heat utilization device for flue gas of a thermal power plant according to claim 1, characterized in that: the cover plate (16) is of a hollow structure, the cover plate (16) forms a turnover structure with the flue gas pipeline (1) through a rotating shaft (17), a fan (20) is fixedly connected inside the cover plate (16), and the fixing block (18) is in threaded connection with the fastening bolt (19).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022723275.1U CN213746689U (en) | 2020-11-23 | 2020-11-23 | Flue gas degree of depth waste heat utilization equipment of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022723275.1U CN213746689U (en) | 2020-11-23 | 2020-11-23 | Flue gas degree of depth waste heat utilization equipment of thermal power plant |
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| CN213746689U true CN213746689U (en) | 2021-07-20 |
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| CN202022723275.1U Active CN213746689U (en) | 2020-11-23 | 2020-11-23 | Flue gas degree of depth waste heat utilization equipment of thermal power plant |
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