CN201555208U - Flue gas waste heat recovery system - Google Patents
Flue gas waste heat recovery system Download PDFInfo
- Publication number
- CN201555208U CN201555208U CN2009202045340U CN200920204534U CN201555208U CN 201555208 U CN201555208 U CN 201555208U CN 2009202045340 U CN2009202045340 U CN 2009202045340U CN 200920204534 U CN200920204534 U CN 200920204534U CN 201555208 U CN201555208 U CN 201555208U
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- flue gas
- phase
- recovery system
- gas waste
- waste heat
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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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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model provides a flue gas waste heat recovery system, which comprises a phase-change heat exchanger, a flow regulating valve, a wall temperature detector and an automatic control device, wherein the phase-change heat exchanger is arranged in a smoke channel and comprises a plurality of heat exchange tubes. The heat exchange tube comprises a base tube with an elliptic cross section and a plurality of fins distributed outside the base tube. The heat exchange tube of the phase-change heat exchanger of the utility model uses an elliptic fin tube structure, so the smoke or air has small flow resistance and the heat exchange efficiency is promoted.
Description
Technical field
The utility model relates to a kind of flue gas waste heat recovery system, is meant a kind of flue gas waste heat recovery system that utilizes the boiler tail flue gas waste heat to add hot water or air especially.
Background technology
As everyone knows, if the high-temperature flue gas that boiler back end ductwork is discharged is directly arranged to atmosphere contaminated environment not only, and can not satisfy present requirement to the boiler energy-saving aspect.So the high-temperature flue gas that how effectively to utilize boiler back end ductwork to discharge provides a kind of energy saving and environment friendly boiler to become the problem that this area people in the industry is concerned about.
At present, the boiler tail flue gas waste heat extensively is used to add hot-air or water.Usually phase-change heat-exchanger is installed so that air or water are heated at boiler back end ductwork.
Yet the heat exchange element in the phase-change heat-exchanger all is to adopt circular fin tube structure at present, and the flue gas or the air flow resistance of circular finned tube are big, a little less than the heat-transfer capability, the heat output of unit are is less than normal, and dust stratification, obstruction easily, can be subjected to the restriction in boiler back end ductwork space simultaneously when mounted.
This shows, a kind of novel flue gas waste heat recovery system that utilizes residual heat from boiler fume need be provided, not only can the fume afterheat of boiler back end ductwork effectively be utilized, and can effectively improve the flue gas of heat exchange element of phase-change heat-exchanger or the problem that air flow resistance is big, heat-transfer capability is not high.
The utility model content
Technical problem underlying to be solved in the utility model is how effectively to reduce the flue gas or the air flow resistance of the heat exchange element of flue gas waste heat recovery system, improve its exchange capability of heat.
Another technical problem to be solved in the utility model is when effectively utilizing the boiler tail high-temperature flue gas, avoids boiler plant by cold end corrosion.
In order to solve the problems of the technologies described above, the utility model provides a kind of flue gas waste heat recovery system, comprise a phase-change heat-exchanger, a flow control valve, wall temperature survey sense instrument and a self-con-tained unit, described phase-change heat-exchanger is arranged in the exhaust gases passes, described phase-change heat-exchanger comprises some heat exchanger tubes, and described heat exchanger tube comprises that cross section is an oval-shaped parent tube and the some fins that are distributed in the parent tube lateral surface.
As the further improvement of above-mentioned flue gas waste heat recovery system, the fin of described heat exchanger tube shape in the shape of a spiral is distributed in the parent tube lateral surface.
As the further improvement of above-mentioned flue gas waste heat recovery system, the parent tube of described heat exchanger tube is disposed across horizontal plunderring in the air-flow.
As the further improvement of above-mentioned flue gas waste heat recovery system, the parent tube cross section ratio of long axis to short axis scope of described heat exchanger tube is 1.5≤A/B≤2.0.
As the further improvement of above-mentioned flue gas waste heat recovery system, the fin thickness scope of described heat exchanger tube is between 0.8～2.0mm.
As the further improvement of above-mentioned flue gas waste heat recovery system, the fin height of described heat exchanger tube is between 15～20mm.
As the further improvement of above-mentioned flue gas waste heat recovery system, the pitch of fin of described heat exchanger tube is between scope 6～15mm.
As the further improvement of above-mentioned flue gas waste heat recovery system, the arrangement mode of described heat exchanger tube adopts stagger arrangement.
Further improvement as above-mentioned flue gas waste heat recovery system, described phase-change heat-exchanger comprises a phase transformation epimere and a phase transformation hypomere, described phase transformation hypomere is arranged in the described exhaust gases passes, described wall temperature is surveyed the sense instrument and is installed in the phase transformation hypomere, and described flow control valve cooperates with self-con-tained unit to be regulated the flow of the material that enters the phase transformation epimere.
Further improvement as above-mentioned flue gas waste heat recovery system, the phase transformation epimere of described phase-change heat-exchanger and the demineralized water pipeline connection in the heating system, described flow control valve is installed on the described demineralized water pipeline, described flow control valve is communicated with self-con-tained unit, enters demineralized water flow in the phase transformation epimere of phase-change heat-exchanger by self-con-tained unit and Flow-rate adjustment valve regulation.
The utility model flue gas waste heat recovery system, because heat exchanger tube adopts the elliptical fin tubular construction, its flue gas or air flow resistance are little, the heat exchange efficiency height effectively improves the heat-exchange capacity of phase-change heat-exchanger integral body.
Description of drawings
Fig. 1 is the planar structure schematic diagram of a preferred embodiment of the utility model flue gas waste heat recovery system.
Fig. 2 is the cross sectional representation of heat exchanger tube in the utility model flue gas waste heat recovery system.
The specific embodiment
Describe below in conjunction with the structure of accompanying drawing flue gas waste heat recovery system of the present utility model.
See also Fig. 1 and Fig. 2, flue gas waste heat recovery system of the present utility model can utilize the boiler tail flue gas waste heat to add hot water or air.Flue gas waste heat recovery system is that the demineralized water in the heating system is heated in the present embodiment, yet flue gas waste heat recovery system of the present utility model is not limited to demineralized water is heated, as can being used for adding hot blast, heat-setting water, or the heating demineralized water adds hot blast etc. simultaneously.
Described flue gas waste heat recovery system comprises a phase-change heat-exchanger 100 and is installed on the self-con-tained unit 200 of phase-change heat-exchanger 100.
Described phase-change heat-exchanger 100 adopts split-type structural, and it comprises a phase transformation epimere 1 and a phase transformation hypomere 9.Described phase transformation hypomere 9 is communicated with phase transformation epimere 1 by vapor uptake 30 and liquid down-comer 40.Described phase transformation hypomere 9 is installed on the tail flue gas passage of boiler air preheater outlet.Described phase transformation epimere 1 is communicated with demineralized water pipeline 2 in the demineralized water pipeline, carries out heat exchange with it so that demineralized water can enter phase transformation epimere 1.
Described phase transformation hypomere 9 comprises a phase transformation section lower collecting box 8, phase transformation section upper header 5 and is positioned at some heat exchanger tubes 7 of phase transformation section lower collecting box 8 and phase transformation section upper header 5, is filled with the phase transformation working media in each heat exchanger tube 7, as water etc.In the present embodiment, heat exchanger tube 7 comprises a parent tube 70 and vertical some fins 72 that are provided with along parent tube 70 outsides.The cross section of described parent tube 70 is oval, and described fin 72 shape in the shape of a spiral is welded on the lateral surface of parent tube 70.70 traverses of parent tube described in the present embodiment (major axis is along airflow direction) are plunderred in the air-flow horizontal, and the particular location relation of right parent tube 70 is not limited.In the present embodiment, the cross section ratio of long axis to short axis scope of described parent tube 70 is 1.5≤A/B≤2.0, and the thickness range of described fin 72 is between 0.8～2.0mm, and the altitude range of fin 72 is between 15～20mm, and the pitch scope of fin 72 is between 6～15mm.The arrangement mode of heat exchanger tube 7 adopts stagger arrangement in the present embodiment, yet the arrangement mode of heat exchanger tube 7 also can adopt alternate manner.
One wall temperature is installed on the wall of the outermost heat exchanger tube 7 of the phase transformation hypomere 9 of described phase-change heat-exchanger 100 is surveyed sense instrument 6, described wall temperature is surveyed the signal input part that sense instrument 6 reaches its temperature signal self-con-tained unit 200.Described wall temperature is surveyed the signal of sense instrument 6 and can be regulated by the demineralized water flow that 200 pairs of self-con-tained units enter phase transformation epimere 1, thereby the flow of the demineralized water by flowing into phase transformation epimere 1 is regulated the wall temperature of phase transformation hypomere 9, reaches the purpose of control phase transformation hypomere 9 wall temperatures.
The phase transformation epimere 1 of described phase-change heat-exchanger 100 comprises a structure of boiler barrel, and right, its concrete structure is not limited by present embodiment.
Between the phase transformation epimere 1 of phase-change heat-exchanger 100 and demineralized water pipeline 2, an inlet pipeline 50 and an outlet pipeline 52 are set in the present embodiment.Described inlet pipeline 50 is communicated with water main road 2 respectively with outlet pipeline 52.Some heaters 4 are installed in described demineralized water pipeline 2 classifications, and described inlet pipeline 50 is arranged on certain one-level heater 4 demineralized water pipeline 2 afterwards of demineralized water pipeline 2.Described outlet pipeline 52 is installed on and is positioned on the higher heater of certain the one-level temperature 4 demineralized water pipeline 2 afterwards.Understandable, inlet pipeline 50 can partly insert demineralized water and realize auxiliary heater 4 heating demineralized waters, also can all insert demineralized water, promptly by fume afterheat demineralized water is heated fully, and need not to utilize low-temperature heater 4, saves the energy.The access port of inlet pipeline 50 can be the outlet of primary heater 4 simultaneously, also can be second or the outlet of third level heater 4, promptly can select according to the power plant system needs, and outlet pipeline 52 is linked into the outlet of certain one-level heater 4 equally as required, when former exhaust gas temperature is higher, can be as far as possible the demineralized water of phase transformation epimere 1 outlet of phase-change heat-exchanger 100 be heated to higher temperature, the thermal efficiency of Chan Shenging will be higher like this.
One flow control valve 3 is installed on the inlet pipeline 50 of the phase transformation epimere 1 of described phase-change heat-exchanger 100, and the demineralized water flow that promptly enters phase transformation epimere 1 can be by flow control valve 3 controls.The control signal of described flow control valve 3 is from the signal output part of self-con-tained unit 200.
The course of work of the utility model flue gas waste heat recovery system is as described below: at first, the fume afterheat of boiler back end ductwork enters the phase transformation hypomere 9 of phase-change heat-exchanger 100, carry out sufficient heat exchange with the heat exchanger tube 7 in the phase transformation hypomere 9, the heat exchanger tube 7 of phase transformation hypomere 9 makes the phase transformation working media in the heat exchanger tube 7 become gaseous state by liquid state owing to absorbing fume afterheat, at this moment, fume afterheat is because of lowering the temperature with heat exchanger tube 7 heat exchanges.The fume afterheat that temperature obviously is lowered inserts deduster through phase transformation hypomere 9; Then, the steam in the phase transformation hypomere 9 enters the phase transformation epimere 1 of phase-change heat-exchanger 100 along vapor uptake 30; Meanwhile, the demineralized water of demineralized water pipeline 2 carries out heat exchange in inlet pipeline 50 enters the drum of phase transformation epimere 1, demineralized water is heated, steam becomes condensed water and is back to phase transformation hypomere 9 along liquid down-comer 40 because of heat release, demineralized water after the heating enters after outlet pipeline 52 on the demineralized water pipeline 2, so far just finishes and utilizes residual heat from boiler fume that demineralized water is heated.
The phase transformation hypomere 9 of above-mentioned phase-change heat-exchanger 100 and the whole heat transfer process of phase transformation epimere 1 be exactly the phase transition process that evaporation and condensation take place the phase transformation working media, and the temperature of phase transformation working media phase transformation situation under certain pressure are constant.At this moment, the phase transformation hypomere 9 of phase-change heat-exchanger 100 and phase transformation epimere 1 are under the phase transformation situation, and heat exchanger tube 7 heating surface temperature are approximately equal to phase transition temperature.So the wall temperature of the phase transformation hypomere 9 of phase-change heat-exchanger 100 is in whole adjustable state.
Understandable, heat exchanger tube 7 in the utility model is under the oval-shaped situation at the cross section that guarantees its parent tube 70, the concrete structure of its fin 72 is not limited by present embodiment, be that fin 72 can have multiple version, as, fin 72 can adopt the rectangular fin structure, only enumerates one of them in the present embodiment.According to actual conditions, the major and minor axis of elliptical tube, the size of rectangular fin, thickness and spacing of fin, with and the number of going up the flow-disturbing hole can change as required.
The heat exchanger tube 7 that has ellipsoidal structure in the present embodiment has been compared following advantage with circular finned tube:
1) compare with pipe, flow resistance is little, and heat transfer coefficient is big, this is because elliptical tube is streamlined, plunders in the air-flow horizontal, moves after the point of flow separation, thereby reduced the whirlpool district behind the pipe, the boundary layer of elliptical tube first half is thinner than pipe in addition, and these factors help strengthening conducts heat and the minimizing flow resistance;
2) heat transfer area of elliptical tube is bigger by 15% than the pipe in same cross section, and therefore under identical flow velocity, the heat transfer outside a tube area can improve 15%;
3) under identical condition, the heat transfer girth of elliptical tube is bigger than pipe, and therefore the thermal resistance in the pipe is little, the heat transfer of medium in helping managing;
4) elliptical finned tube can be arranged compactly, and the sectional area that it accounts for the air channel only is 80% of pipe.
Therefore, than prior art, because heat exchanger tube 7 adopts the elliptical fin tubular construction, its flue gas or air flow resistance are little, and heat exchange efficiency improves, and can effectively improve the heat-exchange capacity of phase-change heat-exchanger 100 integral body.
In addition, because phase-change heat-exchanger 100 replaces traditional low-temperature heater, by utilizing the fume afterheat heating demineralized water of boiler tail, be that phase-change heat-exchanger 100 need not the traditional low-temperature heater of picture by extracted steam from turbine or steam discharge acquisition thermal source, not only save the energy, and the fume afterheat to boiler tail effectively utilizes, and kills two birds with one stone.
This time, survey sense instrument 6 because the phase transformation hypomere 9 of phase-change heat-exchanger 100 is equipped with wall temperature, it can be regulated by the wall temperature of 200 pairs of phase transformation hypomeres 9 of self-con-tained unit, guarantees that the wall temperature of phase transformation hypomere 9 is higher than the acid dew point of flue gas all the time.That is to say, when the wall temperature of phase transformation hypomere 9 is lower than the acid dew point of flue gas, can regulate the demineralized water flow that enters phase transformation epimere 1 by flow control valve 3, realize the wall temperature of phase transformation hypomere 9 is controlled, guarantee that it is higher than the acid dew point of flue gas all the time, avoid phase-change heat-exchanger 100 to be subjected to cold end corrosion.
Understandable, the concrete structure of the phase-change heat-exchanger 100 in the present embodiment is not subjected to the restriction of present embodiment, promptly utilizes residual heat from boiler fume that other heat-exchange apparatus or device that demineralized water heats all can as long as can satisfy.
Only be preferred case study on implementation of the present utility model below, be not limited to the utility model, for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. flue gas waste heat recovery system, comprise a phase-change heat-exchanger, a flow control valve, wall temperature survey sense instrument and a self-con-tained unit, described phase-change heat-exchanger is arranged in the exhaust gases passes, it is characterized in that: described phase-change heat-exchanger comprises some heat exchanger tubes, and described heat exchanger tube comprises that cross section is an oval-shaped parent tube and the some fins that are distributed in the parent tube lateral surface.
2. flue gas waste heat recovery system according to claim 1 is characterized in that: the fin of described heat exchanger tube shape in the shape of a spiral is distributed in the parent tube lateral surface.
3. flue gas waste heat recovery system according to claim 1 is characterized in that: the parent tube of described heat exchanger tube is disposed across horizontal plunderring in the air-flow.
4. flue gas waste heat recovery system according to claim 1 is characterized in that: the parent tube cross section ratio of long axis to short axis scope of described heat exchanger tube is 1.5≤A/B≤2.0.
5. flue gas waste heat recovery system according to claim 1 is characterized in that: the fin thickness scope of described heat exchanger tube is between 0.8～2.0mm.
6. flue gas waste heat recovery system according to claim 1 is characterized in that: the fin height of described heat exchanger tube is between 15～20mm.
7. flue gas waste heat recovery system according to claim 1 is characterized in that: the pitch of fin of described heat exchanger tube is between scope 6～15mm.
8. flue gas waste heat recovery system according to claim 1 is characterized in that: the arrangement mode of described heat exchanger tube adopts stagger arrangement.
9. flue gas waste heat recovery system according to claim 1, it is characterized in that: described phase-change heat-exchanger comprises a phase transformation epimere and a phase transformation hypomere, described phase transformation hypomere is arranged in the described exhaust gases passes, described wall temperature is surveyed the sense instrument and is installed in the phase transformation hypomere, and described flow control valve cooperates with self-con-tained unit to be regulated the flow of the material that enters the phase transformation epimere.
10. flue gas waste heat recovery system according to claim 9, it is characterized in that: the phase transformation epimere of described phase-change heat-exchanger and the demineralized water pipeline connection in the heating system, described flow control valve is installed on the described demineralized water pipeline, described flow control valve is communicated with self-con-tained unit, enters demineralized water flow in the phase transformation epimere of phase-change heat-exchanger by self-con-tained unit and Flow-rate adjustment valve regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202045340U CN201555208U (en) | 2009-08-28 | 2009-08-28 | Flue gas waste heat recovery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202045340U CN201555208U (en) | 2009-08-28 | 2009-08-28 | Flue gas waste heat recovery system |
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| CN201555208U true CN201555208U (en) | 2010-08-18 |
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| CN2009202045340U Expired - Fee Related CN201555208U (en) | 2009-08-28 | 2009-08-28 | Flue gas waste heat recovery system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012036A (en) * | 2010-11-02 | 2011-04-13 | 杨本洛 | Composite phase-transition heat exchanging device for warming clean gas fume and recovering exhaust heat after wet desulphurization |
| CN102183086A (en) * | 2011-03-16 | 2011-09-14 | 上海伏波环保设备有限公司 | System for heating heat conducting oil by using waste heat of boiler flue gas |
| CN103047675A (en) * | 2013-01-17 | 2013-04-17 | 张志宇 | Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater |
| CN103486869A (en) * | 2013-09-25 | 2014-01-01 | 杨君廷 | Dewing-free smoke heat energy carrying and transferring device |
| US20150107537A1 (en) * | 2012-07-06 | 2015-04-23 | Shanghai Fubo Ep Equipment Co., Ltd. | Recovery system of waste heat from flue gas |
| CN104848197A (en) * | 2015-03-31 | 2015-08-19 | 浙江华德利纺织印染有限公司 | Device for recycling boiler tail smoke heat |
| CN105004042A (en) * | 2015-08-22 | 2015-10-28 | 郑州大学 | Water tube transversal scouring type oil/gas-fired boiler with three return strokes |
| CN105486142A (en) * | 2015-12-11 | 2016-04-13 | 北京三益能环工程技术有限公司 | Oval finned tube type heat exchanger and oval finned tube type intelligent phase-change heat exchange device |
| CN106288871A (en) * | 2016-08-31 | 2017-01-04 | 江阴德尔热能机械有限公司 | A kind of recirculating fluidized bed is with built-in anti-adhesion heat exchanger |
| CN106546113A (en) * | 2016-11-29 | 2017-03-29 | 无锡市锡源锅炉有限公司 | A kind of heat carrier gas stove device for recycling exhaust smoke residual heat |
-
2009
- 2009-08-28 CN CN2009202045340U patent/CN201555208U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012036B (en) * | 2010-11-02 | 2012-09-05 | 杨本洛 | Composite phase-transition heat exchanging device for warming clean gas fume and recovering exhaust heat after wet desulphurization |
| CN102012036A (en) * | 2010-11-02 | 2011-04-13 | 杨本洛 | Composite phase-transition heat exchanging device for warming clean gas fume and recovering exhaust heat after wet desulphurization |
| CN102183086A (en) * | 2011-03-16 | 2011-09-14 | 上海伏波环保设备有限公司 | System for heating heat conducting oil by using waste heat of boiler flue gas |
| CN102183086B (en) * | 2011-03-16 | 2013-12-18 | 上海伏波环保设备有限公司 | System for heating heat conducting oil by using waste heat of boiler flue gas |
| US20150107537A1 (en) * | 2012-07-06 | 2015-04-23 | Shanghai Fubo Ep Equipment Co., Ltd. | Recovery system of waste heat from flue gas |
| US9476583B2 (en) * | 2012-07-06 | 2016-10-25 | Shanghai Fubo Ep Equipment Co., Ltd. | Recovery system of waste heat from flue gas |
| CN103047675A (en) * | 2013-01-17 | 2013-04-17 | 张志宇 | Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater |
| CN103047675B (en) * | 2013-01-17 | 2015-06-17 | 张志宇 | Flue gas waste heat utilization device and method of boiler water heat medium controlling circulating type air preheater |
| CN103486869A (en) * | 2013-09-25 | 2014-01-01 | 杨君廷 | Dewing-free smoke heat energy carrying and transferring device |
| CN104848197A (en) * | 2015-03-31 | 2015-08-19 | 浙江华德利纺织印染有限公司 | Device for recycling boiler tail smoke heat |
| CN105004042A (en) * | 2015-08-22 | 2015-10-28 | 郑州大学 | Water tube transversal scouring type oil/gas-fired boiler with three return strokes |
| CN105486142A (en) * | 2015-12-11 | 2016-04-13 | 北京三益能环工程技术有限公司 | Oval finned tube type heat exchanger and oval finned tube type intelligent phase-change heat exchange device |
| CN106288871A (en) * | 2016-08-31 | 2017-01-04 | 江阴德尔热能机械有限公司 | A kind of recirculating fluidized bed is with built-in anti-adhesion heat exchanger |
| CN106546113A (en) * | 2016-11-29 | 2017-03-29 | 无锡市锡源锅炉有限公司 | A kind of heat carrier gas stove device for recycling exhaust smoke residual heat |
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Granted publication date: 20100818 Termination date: 20130828 |