CN101832546A - Integrated split stream water coil air heater and economizer (IWE) - Google Patents
Integrated split stream water coil air heater and economizer (IWE) Download PDFInfo
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- CN101832546A CN101832546A CN201010176763A CN201010176763A CN101832546A CN 101832546 A CN101832546 A CN 101832546A CN 201010176763 A CN201010176763 A CN 201010176763A CN 201010176763 A CN201010176763 A CN 201010176763A CN 101832546 A CN101832546 A CN 101832546A
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- Prior art keywords
- current
- economizer
- heat exchange
- air heater
- water coil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
An integrated water coil air heater and economizer arrangement for a boiler has a feedwater inlet for supplying feedwater to the boiler, and conduits and a valve for splitting the feedwater from the inlet into a first partial lower temperature, lower mass flow stream, and a second partial higher temperature, higher flow stream. A water coil air heater for passage of air to be heated for the boiler contains at least one heat transfer loop in heat transfer relationship with the air, the heat transfer loop of the water coil air heater being connected to receive the first partial stream. An economizer for passage of flue gas to be cooled for the boiler contains at least one heat transfer loop in heat transfer relationship with the flue gas, the heat transfer loop of the economizer being connected to the heat transfer loop of the water coil air heater for receiving the first partial stream from the water coil air heater. A mixing location downstream of the economizer receives and reunites the first and second partial streams and a conduit carries the second partial stream from the feedwater inlet to the to the mixing location.
Description
The cross reference of related application
It is No.61/158 that the application requires United States serial, 774, title is " IWE ", the applying date is the priority of the provisional application on March 10th, 2009, the disclosed content of the document this by reference with the content of the complete elaboration of this paper as a reference.
Technical field
Present invention relates in general to boiler and steam generator field, especially, relate to the air heater that is used for the heating flame air.
Background technology
The tubulose air heater is main air heat mechanism, has water coil air heater (WCAH) as the alternative of generally using.Tubulose air heater or WCAH are used to combustion air is heated to specific operating temperature now.When using WCAH as thermal source, whole current of boiler feedwater are used as heat-exchange medium.Along with air is heated, the temperature of feedwater reduces.Be sent to economizer so leave the feedwater of WCAH, it is used to reduce the temperature of boiler smoke there.Under specific circumstances, tubulose air heater (TAH) is united lower final delivery temperature of use acquisition with WCAH.Along with the reduction of flue gas temperature, the size of TAH and WCAH increases.The size of air heater can significantly increase along with gas temperature is reduced to below 325 ℉.Prior art is subjected to the restriction of feed temperature, flue gas temperature and required combustion air temperature.
Authorize people's such as little Clayton United States Patent (USP) 3; 818; 872 have disclosed a kind of device, and this device is by being provided with bypass in the introducing feedwater current of the economizer of this device some, and protection has the hearth wall of the once through steam generator of flow cycle again under the underload situation.
The United States Patent (USP) 4,160,009 of authorizing Hamabe has disclosed a kind of boiler plant that comprises denitrator, and this denitrator uses catalyst, and is positioned in the optimal reaction temperature zone of the catalyst that is used for denitrator.In order to control the temperature of the burning gases in this optimal reaction temperature zone, this zone is adapted to be connected with high temperature source of the gas or low temperature source of the gas by control valve.
Authorize people's such as Wiechard United States Patent (USP) 5,555,849 have disclosed a kind of gas control system that is used for the catalytic reduction of nitrogen oxidation emission, during low-load operation, for the temperature of keeping flue gas reaches the needed temperature of NOx catalytic reduction, make these feedwater bypass cross the economizer of system by segment fluid flow being supplied to bypass line, arrive catalytic reactor with the flue-gas temperature of keeping an expectation.
Authorize people's such as Albrecht publication application US 2007/0261646 and US 2007/0261647 (wherein the content of Pi Luing this by reference with the content of the complete elaboration of this paper as a reference) disclosed a kind of economizer of multi-path and be used for the temperature controlled method of SCR, wherein keep the economizer exit gas temperature of expectation, across comprising a plurality of boiler load scopes with the tubular structure on the surface that contacts with flue gas.Each tubular structure can comprise a plurality of reciprocally levels or be arranged vertically coiled pipe or wire pipe in economizer, and each tubular structure has an independently feed-water intake.
Prior art be typically the flue place of steam generator system or near flue gas is provided, be preferably in more than 300 ℉.If it will be useful that disclosed system can reduce the discharge temperature of this flue gas economically.
Summary of the invention
An object of the present invention is to obtain a lower boiler final outlet gas temperature more economic as far as possible than prior art.The present invention has improved the driving force between feedwater and the flue gas.This driving force that has improved is improved the heat transfer between water and the flue gas, causes with to use the conventional apparatus to compare required heat exchange area littler.
In order to improve the driving force in the economizer, be enhanced on the accessible numerical value of prior art in the logarithmic mean temperature difference (LMTD) between water and the flue gas (LMTD).Use prior art, under certain condition, LMTD can not bring up to is enough to allow heat exchange to take place.The present invention keeps heat exchange that current take place by economizer to address this problem by improving the only LMTD of a part through the current of economizer, being minimised as simultaneously.
According to the present invention, integrated water coil air heater (WCAH) and economizer (after this referred together or be called IWE) provide a plurality of current approach in WCAH and economizer.Whole the flowing of feedwater enters IWE as independent current or a plurality of current.No matter be the outside of WCAH or once in the inside of the WCAH of IWE part, the feedwater current are divided into two strands or multi-strand flow (shunting WCAH) more.Based on the operating condition of expectation, there is deviation in the current between the shunting.
The characteristic of the claim of various novel features by subsequently of performance characteristic of the present invention is pointed, and forms a part of this disclosure.For a better understanding of the present invention, service advantages and detailed beneficial effect use by it and obtain the accompanying drawing and the text description of the reference explanation preferred embodiment of the present invention subsequently.
Description of drawings
In the accompanying drawings:
Fig. 1 is the schematic diagram of the embodiment of IWE of the present invention;
Fig. 2 is the schematic diagram of another embodiment of IWE of the present invention;
Fig. 3 is the calcspar of another embodiment of the IWE with a plurality of independently economizer economizer banks (bank) of the present invention;
Fig. 4 is the schematic diagram of another embodiment of IWE of the present invention;
Fig. 5 is the schematic diagram that comprises with reference to the accompanying drawings the boiler furnace part of 1 IWE of the present invention;
Fig. 6 is similar to Fig. 5 but comprises the schematic diagram of boiler furnace part of the IWE of another embodiment of the present invention;
Fig. 7 is similar to Fig. 5 but comprises the schematic diagram of boiler furnace part of the IWE of another embodiment of the present invention.
The specific embodiment
With reference now to accompanying drawing,, same reference numerals is used to indicate identical or intimate element in these accompanying drawings.Fig. 1 shows a kind of integrated water coil air heater or WCAH 12 and economizer or ECON 14, and they constitute IWE 10 of the present invention together.Such multichannel economizer 16 that this IWE also can disclose in publication application US2007/0261646 and US2007/0261647 uses, and it can accept the saliva that goes out from the economizer 14 of IWE 10.
The description of device
Total feedwater input inlet 20 by part flow arrangement (for example pipeline and one or more valve) be divided into first's high temperature, than the current 24 of the current 22 of low mass rate and second portion higher temperature, better quality flow.The current 22 of first are by at least one heat exchange loop of WCAH 12, and this heat exchange loop comprises the major part of the heat exchange surface of WCAH 12, and is used to improve the LMTD between water and the economizer gas.This purpose realizes by the air of WCAH 12 by the part heating that only makes total water current.This water temperature that causes entering economizer 14 is very low.The current 24 of second portion flow and have minimized heat exchange surface along pipeline, and are used to move most water.For simplified structure, current 22 and 24 are all by economizer 14, so that two strands of current all have certain heat exchange effect, thereby allowing the better control of current deviation, and make that thermal shock minimizes when current converge again.The flow of per share current is determined by the node that valve 26 is set.
Water in the per share current is kept shunting in whole WCAH part 12, and current with two parts independently current (shunting current) enter economizer part 14.Current enter the economizer part of IWE 10 with the current 24 of the current 22 of a lower temperature, lower mass flow and higher temperature, high flow capacity.Current remain shunting in whole economizer part 14 (shunting economizer).The current 22 of low temperature low discharge are used as the main media with the flue gas heat exchange.These current 22 flow through the major part of the heat exchange surface of WCAH 12 and ECON 14.The current 24 of high temperature, high flow capacity have minimized heat exchange surface with the heat exchange of minimizing with flue gas.
In case two strands of current 22 and 24 fully through or major part passed through economizer part 14, just in mixing portion 28 combinations of IWE 10, no matter this part is inner or outside, is at least near the downstream of economizer 14 still for they.This strand leaves IWE in conjunction with current then, no matter is then to send into the steamdrum (not shown) of boiler at 30 places or from the outlet 36 of economizer, by an economizer or a multichannel economizer 16 that does not have the shunting current, with the work of further conducting heat.
As surround shown in the chain-dotted line 32 of the upstream extremity of current 22 and 24 and valve 26, the shunting of feedwater can occur in water coil air heater outer cover inside or WCAH 12 inside.
Another embodiment of IWE as shown in Figure 2, wherein, current 22 and 24 shunting, valve 26 and mixing portion 28 can be all in the upstreams of WCAH 12, perhaps, shown in chain-dotted line 34, in the upstream of WCAH 12 and the inside of economizer 14.
Fig. 4 illustrates another embodiment of IWE, wherein, lower temperature, than the current 22 of low mass rate at first by the heat exchange loop 22a in the WCAH 12, it is provided to the upper reaches by combustion air, and is cooled thus.Current 22 enter the second heat exchange loop 22b in the economizer 14 then, the flue gas heating of being passed through downwards in the economizer, return the 3rd heating loop 22c that enters in the WCAH 12 then, release heat is given air and is reached the temperature of about air, and then once enter Fourth Ring road 22d, heated by flue gas again before mixing portion 28 combines with the current 24 of higher temperature, high flow.
The shunting 22 that feedwater 20 upstream is divided into and 24 and valve 26 in Fig. 4, be presented at the outside of WCAH 12, but they also can alternatively be arranged on WCAH 12 inside.
Fig. 3 is the calcspar of another embodiment of the present invention, and it comprises exemplary flow rate and temperature, and how the catalytic reduction unit or the SCR 40 that illustrate selectable nitrogen oxide are incorporated into the present invention.The economizer 14 of IWE of the present invention can be 4 pipe economizers, be positioned at the downstream of SCR 40 and accept to come from the lower temperature of WCAH 12, than the current 22e of low mass rate.Alternately, come from the lower temperature of WCAH 12, than partly or entirely being fed into the 23 pipe economizer 42 among the current 22f of low mass rate, it also is received in mixing portion 28 places and converges later all high temperature, the feedwater current 24 of high flow rate again with the current 22e that leaves economizer 14.Valve 26,46 and 48 be set at control current 22 and 24 and they be assigned to the flow of economizer 14 and 42.Some feedwater also can be divided to an attemperator (not shown) at 50 places.Then, before 36 places enter steamdrum, so be fed into the 1 pipe economizer 44 that is arranged on the SCR upstream from the feedwater current that converge again of economizer 42.
Fig. 3 has shown that also countercurrent flue gas stream is introduced into economizer 44 with 650 ℉, then by SCR 40 and enter economizer 42, then with 889,300lb/hr and 494 ℉ enter the economizer 14 of IWE, at last, reach the flue-gas temperature of acceptable 300 ℉, and discharge whole flue gas streams.Combustion air is with 617, and 315lb/hr and 81 ℉ enter WCAH 12 and are heated, and leave with the temperature of 418 ℉ then.Just as above-mentioned, the temperature of feedwater current and flow rate are as shown in Figure 3.
Fig. 5,6 and 7 has shown the embodiment of IWE of the present invention in the boiler furnace part, has also shown the exemplary case of operation of the present invention.
In Fig. 5, the IWE 10 that has WCAH 12 and ECON 14 accepts the feedwater current 22 and 24 shunted by valve 26 from feed-water intake 20, the feedwater current were converged again and were mixed at 28 places before being fed into second economizer 52, at second economizer, 52 places, taken away by water from the additional heat of the smoke inlet 64 at the burner hearth part top that is positioned at 650 ℉.Then, the feedwater flow that converges was supplied to the 3rd economizer 54 and the 4th economizer 56 be discharged and turn back to 545 ℉ the other parts of boiler at 36 places before successively.
The flue gas that is cooled to 300 ℉ now is provided for outlet 66 places of burner hearth flue (not shown).
Simultaneously, combustion air supplies to WCAH 12 with 81 ℉ by air blast 60, here, combustion air as auxiliary air before 62 places are supplied to, the supply of entered the mouth 20 places, 464 ℉ feedwater is heated to 418 ℉.
The installation drawing similar to Fig. 5 is shown among Fig. 6, yet, feedwater 20 is shunted so that a part of current 22 pass through WCAH 12, be fed into economizer 14 from the current of WCAH 12 dischargings, here with from another part of valve 26 feedwater current 24 converge again, thereby all feedwater are all by the flue gas heating by economizer 14.
In the embodiment of Fig. 7, except one current 22 of having only feedwater by economizer 14, and another strand current 24 are shunted at total feed-water intake 20 places, beyond 28 places of the outside of economizer 14 and current 22 converge again, to shown in Figure 6 be similar.In this method, only Gei Shui a part (just current 22) is cooled in WCAH 12.
Further describing of process
The feedwater flow path:
1. feedwater (20) enters the boiler border with whole flows and temperature.
2. feedwater enters IWE in the part that departs from of the shunting current of WCAH (12), is split into two strands of current (22,24) here.Two strands of current keep independently by IWE (10).
3. first strand of current (22) are by way of the major part of WCAH pipe (area of heating surface).
4. second strand of current (24) are admitted to through one and have the single current that minimize the area of heating surface.
5. the major part of heat exchange occurs in first strand of current, and this makes the water temperature in these current reduce.When second burst of current process WCAH part, minimize heat exchange and occur in second strand of current.
6. two strands of current all leave the WCAH part and enter shunting current economizer part.
7. first strand of current are by the major part of economizer tube (area of heating surface).This strand current play a major role for refrigerating gas.
8. second strand of current is by having the single bassoon that minimizes heat exchange surface.
9. after the economizer part of two strands of current through IWE, they enter mixing portion (28).
10. in this mixing portion, two strands of current are mixed to together and leave IWE (10).
11. after water left IWE, it was sent to drum or other economizer part as independent mobile current.
The flue gas flow path:
1. flue gas leaves boiler, and passes through other heat exchange surface.
2. the flue gas economizer part that enters IWE then.
3. gas two strands of current of flowing through, main heat exchange occurs in the area of heating surface of low temperature low discharge.
4. flue gas leaves IWE then.
The control of feedwater shunting
The setting of valve 26, and the control method of the first and second part current 22 that obtain thus and 24 relative confluent are similar to publication application US2007/0261646 with US2007/0261647.Under this method, an algorithm is developed with the stable situation condition on the quantification theory, and wherein mass flowrate is used as the input application.This algorithm is necessary, and when stable situation can be more than one hour or during more of a specified duration reaching, the real time temperature in economizer downstream is measured and misled potentially in this case that stable state does not reach like this.In case stable state reaches, this algorithm can be by " correction " (such as adjusting in proportion) to remedy difference actual and theoretical operation.The use of this algorithm depends on the actual size and the accessible mass flowrate of equipment.
Though specific embodiments of the invention are at length shown and describe, and so that application of the present invention and principle to be described, are appreciated that this does not show that the present invention is limited to this, and the present invention can implement in other mode not breaking away from this principle.Such as, the present invention can be applied to comprising the new construction of boiler or steam generator, perhaps is applied to substitute, revises or be adapted to existing boiler or steam generator.In some embodiments of the invention, some feature of the present invention sometimes can be not and other the corresponding use of feature, is used to preferred enforcement.Correspondingly, all these changes and embodiment all fall into the protection domain of claim (comprising arbitrary He all situations that is equal to) subsequently.
Claims (2)
1. one kind is used to improve integrated water coil air heater and the economizer device of boiler with logarithmic mean temperature difference (LMTD), comprising:
The feed-water intake of the boiler that feeds water is provided;
Part flow arrangement, with feedwater from inlet be split into first's high temperature, than the current of the current of low mass rate and second portion higher temperature, high flow;
Make and be heated the water coil air heater that the air that is used for boiler passes through, this water coil air heater comprises the heat exchange loop of at least one and air generation heat exchange, and the heat exchange loop of this water coil air heater is connected with part flow arrangement to accept first's current;
Making is cooled is used for the economizer that the flue gas of boiler passes through, this economizer comprises the heat exchange loop of at least one and flue gas generation heat exchange, and the heat exchange loop of this economizer is connected with the heat exchange loop of water coil air heater to accept to come from first's current of water coil air heater;
Near the economizer downstream mixing arrangement is used for accepting and converging again the first and second part current; With
The pipeline that connects between part flow arrangement and mixing arrangement is used to make the second portion current to lead to mixing arrangement.
2. one kind is used to improve the method for boiler economizer with logarithmic mean temperature difference (LMTD), comprising:
Provide feedwater water to flow to boiler;
With these current be split into first's high temperature, than the current of the current of low mass rate and second portion higher temperature, high flow;
Provide first's water to flow to the water coil air heater, be to be heated the air that is used for boiler to pass through, this water coil air heater comprises the heat exchange loop of at least one and air generation heat exchange, and first's current flow through the heat exchange loop of this water coil air heater;
Behind first's current process heat exchange loop of this water coil air heater, first's current supply to economizer, the flue gas that making is cooled is used for boiler passes through, this economizer comprises the heat exchange loop of at least one and flue gas generation heat exchange, the first's current that come from the water coil air heater heat exchange loop of economizer of flowing through;
Guiding second portion water flows to the economizer downstream; With
Near the economizer downstream, converge the first and second part current again.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15877409P | 2009-03-10 | 2009-03-10 | |
| US61/158,774 | 2009-03-10 | ||
| US12/581,637 | 2009-10-19 | ||
| US12/581,637 US8286595B2 (en) | 2009-03-10 | 2009-10-19 | Integrated split stream water coil air heater and economizer (IWE) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101832546A true CN101832546A (en) | 2010-09-15 |
| CN101832546B CN101832546B (en) | 2014-08-20 |
Family
ID=42716707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010176763.3A Expired - Fee Related CN101832546B (en) | 2009-03-10 | 2010-03-09 | Integrated split stream water coil air heater and economizer (IWE) |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101832546B (en) |
| CA (1) | CA2696649C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103380329A (en) * | 2011-02-25 | 2013-10-30 | 三菱重工业株式会社 | Boiler plant |
| CN103953913A (en) * | 2014-03-28 | 2014-07-30 | 上海发电设备成套设计研究院 | Heat-exchange adjustable economizer system for whole-process operation of denitration equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE964502C (en) * | 1952-05-13 | 1957-05-23 | Foster Wheeler Ltd | Steam power plant with pre-heating by bleeding steam and by flue gases |
| JPS58117902A (en) * | 1981-12-09 | 1983-07-13 | コンバツシヨン・エンヂニアリング・インコ−ポレ−テツド | Boiler reducing heat absorption of economizer |
| CN2555468Y (en) * | 2002-08-05 | 2003-06-11 | 涂建华 | Medium heat exchanger with split-flow and hybrid temp regulation |
| CN101055073A (en) * | 2007-06-05 | 2007-10-17 | 湖南大学 | Discrete low grade residue heat recovery boiler high temperature water-supply and air preheater system |
-
2010
- 2010-03-09 CA CA2696649A patent/CA2696649C/en not_active Expired - Fee Related
- 2010-03-09 CN CN201010176763.3A patent/CN101832546B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE964502C (en) * | 1952-05-13 | 1957-05-23 | Foster Wheeler Ltd | Steam power plant with pre-heating by bleeding steam and by flue gases |
| JPS58117902A (en) * | 1981-12-09 | 1983-07-13 | コンバツシヨン・エンヂニアリング・インコ−ポレ−テツド | Boiler reducing heat absorption of economizer |
| CN2555468Y (en) * | 2002-08-05 | 2003-06-11 | 涂建华 | Medium heat exchanger with split-flow and hybrid temp regulation |
| CN101055073A (en) * | 2007-06-05 | 2007-10-17 | 湖南大学 | Discrete low grade residue heat recovery boiler high temperature water-supply and air preheater system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103380329A (en) * | 2011-02-25 | 2013-10-30 | 三菱重工业株式会社 | Boiler plant |
| CN103380329B (en) * | 2011-02-25 | 2016-06-22 | 三菱重工业株式会社 | Boiler plant |
| CN103953913A (en) * | 2014-03-28 | 2014-07-30 | 上海发电设备成套设计研究院 | Heat-exchange adjustable economizer system for whole-process operation of denitration equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101832546B (en) | 2014-08-20 |
| CA2696649C (en) | 2016-10-04 |
| CA2696649A1 (en) | 2010-09-10 |
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Granted publication date: 20140820 |