CN105299680A - Flue gas reheating system based on phase-change heat transfer and fluoroplastic technologies - Google Patents
Flue gas reheating system based on phase-change heat transfer and fluoroplastic technologies Download PDFInfo
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- CN105299680A CN105299680A CN201510832991.4A CN201510832991A CN105299680A CN 105299680 A CN105299680 A CN 105299680A CN 201510832991 A CN201510832991 A CN 201510832991A CN 105299680 A CN105299680 A CN 105299680A
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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 invention discloses a flue gas reheating system based on phase-change heat transfer and fluoroplastic technologies. The flue gas reheating system is arranged at the tail of a flue of a boiler; a last stage air preheater, a dust remover and a desulfurizing tower are sequentially arranged between the tail of the flue and a chimney; and a flue gas outlet of the dust remover is connected with a flue gas inlet of the desulfurizing tower. The flue gas reheating system comprises a phase-change waste heat recovering module for recovering waste heat of flue gas, a fluoroplastic reheating module for reheating the low temperature flue gas after desulfuration, and an automatic control module for automatically controlling the flue gas reheating system integrally, wherein the phase-change waste heat recovering module is arranged in the flue between the last stage air preheater and the dust remover, and the fluoroplastic reheating module is arranged in the flue between the desulfurizing tower and the chimney. Compared with the prior art, the flue gas reheating system has the advantages of good waste heat recovering performance, adjustability, controllability, stability, reliability, good reheating performance, corrosion resistance, little energy consumption, etc.; flue gas discharge power of the boiler is improved greatly; and the surrounding environment of a power plant is improved.
Description
Technical field
The present invention relates to a kind of flue gas reheat system, particularly a kind of flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology.This flue gas reheat system can improve the utilization rate of fume afterheat, and strengthen the power of boiler exhaust gas, it is mainly used in the back-end ductwork systems such as thermal power generation boiler, Industrial Stoves, heating furnace.
Background technology
Owing to using the changeable of coal-fired composition, in domestic existing thermal power plant, actual motion exhaust gas temperature does not often reach design load, causes the decline of boiler actual operating efficiency; Exhaust gas temperature higher in addition is also unfavorable for the normal operation of the deduster in boiler back end ductwork, affects operating efficiency and the service life of deduster, reduces the operation stability of unit.
In addition, the existing thermal power plant running generally all have employed Wet Flue Gas Desulfurization Technique, by boiler smoke by after wet desulfurization system desulfurization again by smoke stack emission in air.But flue gas is after wet desulphurization, flue-gas temperature drops to a lower level, cause acid dew condensation in flue gas, meeting corrosion failure flue and inner wall of stack, cause irremediable damage, reduce the operational reliability of unit, shorten the Maintenance and Repair cycle of unit, while adding unit maintenance maintenance cost, decrease generated energy and the income of unit; In addition, the low-temperature flue gas after desulfurization, if directly carry out airborne release through chimney, the row of flue gas rises and is short of power, and will strengthen the difficulty of smoke stack emission, reduces diffusion height and the scope of fume emission; Easily form the sedimentation of gypsum rain and acid drop at power plant's periphery, serious destruction is caused to the environment of power plant's periphery, affects operation and the related Evaluation of power plant.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention is to provide a kind of flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology, effectively can recycle waste heat, again can to flue gas after desulfurization temperature increase, guarantee that the row of flue gas rises power, expand diffusion height and the scope of fume emission, reduce the adverse effect to surrounding environment.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology, be arranged on the flue afterbody of boiler, final stage air preheater, deduster and desulfurizing tower is disposed with between this flue afterbody and chimney, the exhanst gas outlet of described deduster connects the smoke inlet of described desulfurizing tower, this flue gas reheat system comprises the phase transformation waste heat recovery module for reclaiming fume afterheat, the fluoroplastics thermal modules again for heating again low-temperature flue gas after desulfurization, and for carrying out the automatic control module automatically controlled to this flue gas reheat entire system; In the flue of described phase-change heat-exchange waste heat recovery module installation between final stage air preheater and deduster, in the flue of described fluoroplastics reheating module installation between described desulfurizing tower and chimney.
Described phase transformation waste heat recovery module comprises phase-change heat-exchanger hypomere and drum, described phase-change heat-exchanger hypomere is made up of header tank, heat exchanger tube and steam manifold, described phase-change heat-exchanger hypomere is made up of two header tanks, heat exchanger tube, two steam manifolds, transverse collector pipe and horizontal dry pipes, horizontal steam manifold and horizontal header tank are welded on the both sides up and down of heat exchanger tube respectively, two steam manifolds are vertically welded in the both sides of horizontal steam manifold respectively, and two header tanks are also vertically welded in the both sides of horizontal header tank respectively; Steam manifold is connected to drum after jet chimney, and drum is then connected to header tank by hydraulic pipeline and forms a closed cycle.
Described heat exchanger tube is spiral fin coil.
Described fluoroplastics again thermal modules comprise teflon heat exchanger and circulating pump; Circulating pump is connected with drum, and drum is then connected to teflon heat exchanger by control valve and forms a closed cycle.
In described teflon heat exchanger, the pipe thickness of fluoroplastics heat exchanger tube is 0.3 to 1mm.
Described automatic control module comprises the warm resistance of cigarette and electric heater after the warm resistance of cigarette after phase transformation, reheating, after described phase transformation the warm resistance of cigarette be arranged on phase-change heat-exchanger after flue in, after reheating the warm resistance of cigarette be arranged on teflon heat exchanger after flue in, electric heater is arranged in the flue of chimney smoke entrance, and after phase transformation, after the warm resistance of cigarette, reheating, the warm resistance of cigarette and electric heater are connected to automatic control module respectively by different circuits.
When in described automatic control module, after phase transformation, the measuring-signal of the warm resistance of cigarette reaches design restriction, measuring-signal can feed back to automatic control module and cause control valve automatically to regulate aperture.
When in described automatic control module, after reheating, the measuring-signal of the warm resistance of cigarette reaches design restriction, measuring-signal can feed back to automatic control module and cause control valve automatically to regulate aperture.
When in described automatic control module, the automatic adjustment of control valve cannot meet design requirement, described flue gas reheat system can automatically start electric heater and compensate operation, makes whole flue gas reheat system cloud gray model in scope of design.
Compared with prior art, the present invention has following advantage:
1. by optimal design, good waste heat recovery performance: adopt phase-change heat-exchanger, ensures that the lowermost wall surface temperature of " phase transformation section " heating surface only has small gradient temperature drop, can realize the significantly decline to exhaust gas temperature, middle low temperature heat energies a large amount of in recovered flue gas;
2. adjustable controlled, reliable and stable: employing phase-change heat-exchanger can realize the regulation and control to wall surface temperature, flue-gas temperature after cooling is controlled more than acid dew point, thus avoid the stifled ash of heat exchange phase transformation section and acid to reveal the phenomenons such as corrosion, also the normal work of follow-up deduster and desulfurizing tower can be promoted, ensure the stability of system to greatest extent while Mist heat recovering, significantly reduce the maintenance cost of equipment;
3. good in thermal property again: adopt teflon heat exchanger to carry out reheating operation to the low-temperature flue gas after desulfurization, wall thickness is adopted to be the fluorine plastic tube of 0.3 to 1mm, heat exchange property is good, when equal heat exchange amount, the volume of teflon heat exchanger is 1/4 of metal tube heat exchanger volume, substantially increases the thermal efficiency again to low-temperature flue gas;
4. corrosion-resistant: teflon heat exchanger adopts fluorine plastic tube as heat exchange element, fluorine plastic tube can ensure heat exchanger acid and alkali dew corrosion and black dirt bridging in the process of heating low-temperature flue gas;
5. power consumption is few: the phase-change heat-exchanger part in the present invention is passive system structure, can form spontaneous circulation, reduce system energy consumption according to the vaporization of recirculated water and liquefaction process.
Accompanying drawing explanation
Fig. 1: a kind of flue gas reheat system schematic based on phase-change heat-exchange and fluoroplastics technology of the present invention.
Fig. 2: the phase-change heat-exchanger hypomere schematic diagram in the present invention.
In figure: 1. final stage air preheater; 2. phase transformation waste heat recovery module; 3. fluoroplastics thermal modules again; 4. deduster; 5. desulfurizing tower; 6. automatic control module; 7. chimney; 21. phase-change heat-exchanger hypomeres; 22. header tanks; 23. heat exchanger tubes; 24. steam manifolds; 25. hydrophobic pipelines; 26. steam pipeworks; 27. drums; 28. transverse collector pipes; 29. horizontal dry pipes; 31. circulating pumps; 32. control valves; 33. teflon heat exchangers; The warm resistance of cigarette after 61. phase transformations; The warm resistance of cigarette after 62. reheating; 63. electric heaters.
Detailed description of the invention
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
As shown in Figure 1, flue gas reheat Operation system setting of the present invention is at the flue afterbody of boiler, this flue afterbody and chimney 7 are disposed with final stage air preheater 1, deduster 4 and desulfurizing tower 5, and the exhanst gas outlet of described deduster 4 connects the smoke inlet of described desulfurizing tower 5.This flue gas reheat system comprises the phase transformation waste heat recovery module 2 for reclaiming fume afterheat, the fluoroplastics reheating module 3 for heating again low-temperature flue gas after desulfurization, and for carrying out the automatic control module 6 automatically controlled to this flue gas reheat entire system; Described phase-change heat-exchange waste heat recovery module 2 is arranged in the flue between final stage air preheater 1 and deduster 4, and described fluoroplastics reheating module 3 is arranged in the flue between described desulfurizing tower 5 and chimney 7.
Phase transformation waste heat recovery module 2 comprises phase-change heat-exchanger hypomere 21 and drum 27, wherein phase-change heat-exchanger hypomere 21 is made up of two header tanks 22, heat exchanger tube 23, two steam manifolds 24, transverse collector pipe 28 and horizontal dry pipes 29, horizontal steam manifold 29 and horizontal header tank 28 are welded on the both sides up and down of heat exchanger tube 23 respectively, two steam manifolds 24 are vertically welded in the both sides of horizontal steam manifold 29 respectively, and two header tanks 22 are also vertically welded in the both sides of horizontal header tank 28 respectively; Steam manifold 24 connects drum 27 through jet chimney 26, and drum 27 is then connected to header tank 22 through hydraulic pipeline 25 and forms a closed cycle.
Fluoroplastics reheating module 3 comprises teflon heat exchanger 33 and circulating pump 31; Circulating pump 31 is connected with drum 27, and drum 27 is then connected to teflon heat exchanger 33 through control valve 32 and forms a closed cycle.
Automatic control module 6 comprises the warm resistance 62 of cigarette and electric heater 63 after the warm resistance of cigarette 61 after phase transformation, reheating, after phase transformation the warm resistance 61 of cigarette be arranged on phase-change heat-exchanger after flue in, after reheating, the warm resistance 62 of cigarette is arranged in the flue after teflon heat exchanger 33, electric heater 63 is arranged in the flue of chimney 7 smoke inlet, after phase transformation after the warm resistance of cigarette 61, reheating the warm resistance of cigarette 62 and electric heater 63 by different connections to automatic control module 6.
In the present invention, phase transformation waste heat recovery module 2 is the functional units realizing boiler exhaust gas waste heat recovery, demineralized water in phase inversion heat pipe 23 by flue gas, steam concentrates in steam manifold 24 by horizontal dry pipe 29, by entering drum 27 heat cycles aqueous medium after jet chimney 26, the water condensed into after being cooled then flows to transverse collector pipe 28 by drain water piping 25, finally concentrate at header tank 22 and form a closed cycle, thus the waste heat continuously in recovered flue gas, flue gas is cooled to the temperature that suitable, the normal work of deduster is also ensure that while ensureing that the condensation of acid dew does not occur.Phase inversion heat pipe 23 adopts spiral fin coil, can increase heat exchange area, improves heat exchange efficiency.
Demineralized water medium in fluoroplastics reheating module 3 provides power by circulating pump 31, enter after being heated in drum 27, enter in teflon heat exchanger 33 through control valve 32, heat the low-temperature flue gas flowed out from desulfurizing tower, impel flue-gas temperature to raise, improve flue gas hoisting power.In teflon heat exchanger 33, the thickness of fluoroplastics heat exchange tube wall is 0.3 to 1mm, and heat exchange property is good, and when equal heat exchange amount, the volume of teflon heat exchanger is
1/4 of heat exchange of heat pipe volume, substantially increases the thermal efficiency again to low-temperature flue gas, ensures the realization of flue gas reheat function; The chemical inertness that fluoroplastics are good and physical characteristic, be not easy by the corrosion of acid dew.
Automatic control module 6 can according to the aperture of the measuring-signal control and regulation valve 32 of the warm resistance 61 of cigarette after phase transformation, thus ensure that cigarette temperature is in scope of design, under not affecting the prerequisite in the system worked well such as deduster and desulfurizing tower and service life below, the raising flue gas waste heat recovery efficiency of amplitude peak; Meanwhile, also ensure that phase transformation section flue-gas temperature is more than dew-point temperature, phase-change heat-exchanger surface there will not be the condensation of acid dew and flying dust bridging, ensures normal work and the useful life of phase-change heat exchange system.In addition, after reheating, the measuring-signal of the warm resistance 62 of cigarette also can the aperture of FEEDBACK CONTROL control valve 32, ensures enough circulating water flows and adds heat smoke, make flue-gas temperature be increased to design load, ensure the realization of reheat system function.
When there is contradiction and cannot meet design requirement in above-mentioned two automatic control loops, automatic control module 6 is by the feedback signal of warm for cigarette after priority feedback phase transformation resistance 61, control valve 32 aperture is regulated, now, electric heater 63 for subsequent use will be opened automatically, close again after temperature design limit value is heated to the low-temperature flue gas after desulfurization, fully ensure that the realization of reheat system waste heat recovery and flue gas reheat two functions.
Waste heat recovery of the present invention and flue gas reheat are achieved in that
(1) waste heat recovery: when flue gas enters phase transformation waste heat recovery module, recirculated water in flue gas phase inversion heat pipe, recirculated water by thermal evaporation laggard enter steam manifold, the recirculated water of drum heating fluoroplastics thermal modules is again entered via steam pipework, finally be condensed into water to enter header tank via hydrophobic pipeline and form a closed cycle, waste heat continuously in recovered flue gas, flue gas is cooled to the temperature that suitable, while ensureing that the condensation of acid dew does not occur, also ensure that the normal work of deduster.
(2) flue gas reheat: in fluoroplastics reheating module 3, demineralized water medium provides power by circulating pump 31, enter after being heated in drum 27 and enter through overregulating valve 32 low-temperature flue gas heating in teflon heat exchanger 33 and flow out desulfurizing tower, impel flue-gas temperature to be increased to design load.In addition, teflon heat exchanger adopts thin-walled heat exchanger tube to also improve the heat exchange efficiency of heat exchanger, ensures the realization of flue gas reheat function.
(3) flue gas reheat for subsequent use: when boiler or system are in certain operational mode and cannot meet the realizing of flue gas reheat function, system heats automatically starting electric heater the low-temperature flue gas after desulfurization, for the complete realization of flue gas reheat function provides further guarantee.
According to the instruction of the present embodiment, those skilled in the art can realize the technical scheme in other scope completely.
Claims (9)
1. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology, be arranged on the flue afterbody of boiler, final stage air preheater (1), deduster (4) and desulfurizing tower (5) is disposed with between described flue afterbody and chimney (7), the exhanst gas outlet of described deduster (4) connects the smoke inlet of described desulfurizing tower (5), it is characterized in that
This flue gas reheat system comprises the phase transformation waste heat recovery module (2) for reclaiming fume afterheat, the fluoroplastics thermal modules (3) again for heating again low-temperature flue gas after desulfurization, and for carrying out the automatic control module (6) automatically controlled to this flue gas reheat entire system;
Described phase-change heat-exchange waste heat recovery module (2) is arranged in the flue between final stage air preheater (1) and deduster (4), and described fluoroplastics again thermal modules (3) are arranged in the flue between described desulfurizing tower (5) and chimney (7).
2. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology according to claim 1, it is characterized in that, described phase transformation waste heat recovery module (2) comprises phase-change heat-exchanger hypomere (21) and drum (27), described phase-change heat-exchanger hypomere (21) is by two header tanks (22), heat exchanger tube (23), two steam manifolds (24), transverse collector pipe (28) and horizontal dry pipe (29) are formed, horizontal steam manifold (29) and horizontal header tank (28) are welded on the both sides up and down of heat exchanger tube (23) respectively, two steam manifolds (24) are vertically welded in the both sides of horizontal steam manifold (29) respectively, two header tanks (22) are also vertically welded in the both sides of transverse collector pipe (28) respectively, steam manifold (24) is connected to drum (27) after jet chimney (26), and drum (27) is then connected to header tank (22) by hydrophobic pipeline (25) and forms a closed cycle.
3. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology according to claim 1, it is characterized in that, described heat exchanger tube (23) is spiral fin coil.
4. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology according to claim 1, it is characterized in that, described fluoroplastics again thermal modules (3) comprise teflon heat exchanger (33) and circulating pump (31); Circulating pump (31) is connected with drum (27), and drum (27) is then connected to teflon heat exchanger (33) by control valve (32) and forms a closed cycle.
5., according to the arbitrary described flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology of Claims 1-4, it is characterized in that, in described teflon heat exchanger (33), the pipe thickness of fluoroplastics heat exchanger tube is 0.3 to 1mm.
6. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology according to claim 1, it is characterized in that, described automatic control module (6) comprises the warm resistance of cigarette (61) after phase transformation, the warm resistance of cigarette (62) and electric heater (63) after reheating, after described phase transformation the warm resistance of cigarette (61) be arranged on phase-change heat-exchanger after flue in, after reheating, the warm resistance of cigarette (62) is arranged in the flue after teflon heat exchanger (33), electric heater (63) is arranged in the flue of chimney (7) smoke inlet, the warm resistance of cigarette (61) after phase transformation, after reheating, the warm resistance of cigarette (62) and electric heater (63) are connected to automatic control module (6) respectively by different circuits.
7. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology according to claim 6, it is characterized in that, when in described automatic control module (6), after phase transformation, the measuring-signal of the warm resistance of cigarette (61) reaches design restriction, measuring-signal can feed back to automatic control module (6) and cause control valve (32) automatically to regulate aperture.
8. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology according to claim 6, it is characterized in that, when in described automatic control module (6), after reheating, the measuring-signal of the warm resistance of cigarette (62) reaches design restriction, measuring-signal can feed back to automatic control module (6) and cause control valve (32) automatically to regulate aperture.
9. the flue gas reheat system based on phase-change heat-exchange and fluoroplastics technology according to claim 6, it is characterized in that, when in described automatic control module (6), the automatic adjustment of control valve (32) cannot meet design requirement, described flue gas reheat system can automatically start electric heater and compensate operation, makes whole flue gas reheat system cloud gray model in scope of design.
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Cited By (2)
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| CN107606633A (en) * | 2017-09-27 | 2018-01-19 | 北京龙电宏泰环保科技有限公司 | A kind of flue gas waste heat recovery method based on closed cycle heat recovery |
| CN108036302A (en) * | 2018-01-10 | 2018-05-15 | 北京龙电宏泰环保科技有限公司 | A kind of hot water-filling method suitable for fluoroplastics flue gas heat-exchange unit |
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Application publication date: 20160203 |