CN102679306A - Pulse detonation combustor heat exchanger - Google Patents
Pulse detonation combustor heat exchanger Download PDFInfo
- Publication number
- CN102679306A CN102679306A CN2012100403925A CN201210040392A CN102679306A CN 102679306 A CN102679306 A CN 102679306A CN 2012100403925 A CN2012100403925 A CN 2012100403925A CN 201210040392 A CN201210040392 A CN 201210040392A CN 102679306 A CN102679306 A CN 102679306A
- Authority
- CN
- China
- Prior art keywords
- pulse
- knocking
- heat exchanger
- burner
- burner heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005474 detonation Methods 0.000 title abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims description 45
- 239000007789 gas Substances 0.000 claims description 21
- 239000000446 fuel Substances 0.000 claims description 19
- 230000002411 adverse Effects 0.000 claims description 2
- 239000000567 combustion gas Substances 0.000 abstract 2
- 230000037361 pathway Effects 0.000 abstract 2
- 238000012546 transfer Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C15/00—Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B9/00—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body
- F22B9/02—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body the boiler body being disposed upright, e.g. above the combustion chamber
- F22B9/08—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body the boiler body being disposed upright, e.g. above the combustion chamber the fire tubes being in horizontal arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
- F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R7/00—Intermittent or explosive combustion chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/03009—Elongated tube-shaped combustion chambers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention relates to a pulse detonation combustor heat exchanger. The present application provides a pulse detonation combustor heat exchanger (100). The pulse detonation combustor heat exchanger (100) may include one or more pulse detonation combustors (110) creating combustion gases (170) therein, one or more inner pathways (190) positioned about the pulse detonation combustors (110), and a working medium (240) flowing in the inner pathways (190) so as to exchange heat with the combustion gases (170) in the pulse detonation combustors (110).
Description
Technical field
The application relates generally to pulse-knocking burner and system, and more specifically, relates to the heat exchanger very efficiently such as boiler etc. is used the pulse-knocking burner.
Background technology
Compare with the conventional engines that moves with the constant voltage detonation, known pulse-knocking burner is general to be moved with having the pinking process of boosting.Particularly, air and fuel mix in pulse detonation combustor and are lighted, to produce the combustion pressure ripple.The combustion pressure ripple is transformed into detonation wave, and the back is the burning gases that produce heat and thrust.Thereby with general attainable the comparing of using based on detonation of conventional engines, the pulse-knocking burner has the potentiality of moving with higher thermodynamic efficiency.
The nearest development of pulse-knocking burner concentrates on the practical application, for example for aircraft engine produces extra thrust/propelling, and improves the overall performance based on the power generation system on ground.Also with the pulse-knocking burner with the means that act on boiler cleaning very efficiently etc.
Industrial Boiler moves through using thermal source from the working media of water or another kind of type, to produce steam.Steam can be used to drive the load of turbine or another kind of type.Thermal source can be the burner of combustion fuel-air mixture therein.Heat can be delivered to working media from burner through heat exchanger.The efficient of the heat exchanger of boiler or other type partly is the basis with the rate of heat transfer to working media.Generally speaking, compare with laminar flow, boiler is often higher concerning turbulent flow with the rate of heat transfer of similarly installing.
Thereby expectation makes pulse-knocking burner very efficiently be suitable in the heat exchanger such as boiler etc., using.Compare with conventional boiler etc., use this pulse-knocking burner that higher rate of heat transfer will be provided with less fuel consumption, and compact in size simultaneously.
Summary of the invention
Thereby the application provides a kind of pulse-knocking burner heat exchanger.This pulse-knocking burner heat exchanger can be included in the one or more pulse-knocking burners that wherein produce burning gases, the one or more inner passages on every side that are positioned at the pulse-knocking burner; And working media; Working media flows in the inner passage, so as with the pulse-knocking burner in burning gases exchanged heat.
The application further provides a kind of pulse-knocking burner boiler.This pulse-knocking boiler can be included in the one or more pulse-knocking burners that wherein produce burning gases, the many boiler tubes on every side that are positioned at the pulse-knocking burner; And working media; Working media flows in boiler tube, so as with the pulse-knocking burner in burning gases exchanged heat.
The application further provides a kind of pulse-knocking burner heat exchanger.This pulse-knocking burner heat exchanger can comprise in outside cabin, the location outside cabin and produce therein burning gases one or more pulse-knocking burners, be positioned at the one or more interior chamber in the outside cabin; And working media; Working media flows in interior chamber, so as with the pulse-knocking burner in burning gases exchanged heat.
Check combine some accompanying drawings and accompanying claims resulting below after the detailed description, these of the application and further feature and advantage will become obvious to those of ordinary skills.
Description of drawings
Fig. 1 is the sketch map of known pulse-knocking burner.
Fig. 2 is the sketch map like the pulse-knocking burner heat exchanger that can describe in this article.
Fig. 3 is the side plan view of the pulse-knocking burner heat exchanger of Fig. 2.
Fig. 4 is the sketch map like the pulse-knocking burner boiler that can describe in this article.
Fig. 5 is the side plan view of the pulse-knocking burner boiler of Fig. 4.
List of parts
10 pulse-knocking burners
15 air intakes
20 fuel inlets
25 outgoing nozzles
30 combustion tubes
35 combustion zones
40 central body
45 igniters
100 pulse-knocking burner heat exchangers
110 pulse-knocking burners
120 combustion tubes
130 combustion zones
140 air intakes
150 fuel inlets
160 igniters
170 burning gases
180 outside cabins
190 inner passages
200 cold inlets
210 heat outlets
220 collectors
230 preheaters
240 working medias
250 pulse-knocking burner boilers
260 boiler tubes
270 collectors
280 economizers
The specific embodiment
As used herein, term " pulse-knocking burner " refers to and from the pinking of fuel and oxidant or accurate pinking, produces the device or the system of boosting with speedup.The pulse-knocking burner can move by repeat pattern, in device, to produce a plurality of pinkings or accurate pinking." pinking " can be wherein, and shock wave connects the supersonic combustion on the combustion zone.Impact can be kept by the energy that discharges from the combustion zone, so that produce the combustion product that is in higher pressure than combustion reactant." accurate pinking " can be generation boost the supersonic speed turbulent combustion process with speedup higher than boosting of being produced of subsonic speed deflagration wave (be pinking with fast flame) and speedup.For simplicity, term used herein " pinking " or " detonation wave " will comprise pinking and accurate pinking.
Exemplary pulse detonating combustion device (some of them will below in further detail discuss) comprises the igniter of the burning that is used for fire fuel/oxidant mixture, and detonation chamber, the pressure wave forward that burning causes coalescence and produce detonation wave in detonation chamber.Can or through such as the external point burning things which may cause a fire disaster of spark discharge, laser pulse, thermal source or plasma igniter, perhaps through focusing on such as impacting, light a fire automatically or causing each pinking or accurate pinking from the gas-dynamic process of the existing detonation wave (cross-ignition) in another source.The detonation chamber geometrical construction can allow at detonation wave supercharging is arranged at the back, with the driving detonation wave, and also from the exhaust outlet of pulse-knocking burner, blows out combustion product itself.Can use other member and other structure in this article.
The geometrical construction of various combustion chambers can be supported the formation of pinking, comprises circular cell, pipe, resonant cavity, reflector space and doughnut.Such Combustion chamber design can have cross section constant or that change on area and shape.Exemplary combustion chamber comprises cylindrical tube and the pipe with polygon cross section, such as for example hexagonal tube.As used herein, " downstream " refer at least one the flow direction in fuel or the oxidant.
Referring now to accompanying drawing,, wherein same numeral shows similar elements in some views, and Fig. 1 has shown the universal instance like the pulse-knocking burner 10 that can describe in this article and use.The outgoing nozzle 25 that pulse-knocking burner 10 can extend to relative downstream end from air intake 15 and one or more fuel inlets 20 of head end.Combustion tube 30 can extend to the outgoing nozzle 25 of downstream end from head end.Combustion tube 30 limits combustion zone 35 therein.For pinking and/or accurate pinking, can use other member and other structure in this article.
Air intake 15 can be connected on the pressurized air source, for example compressor.Forced air can be used to fill and purge combustion zone 35, and can be used as the oxidant that is used for combustion fuel.Air intake 15 can be communicated with central body 40.Central body 40 is extensible to combustion zone 35.Central body 40 can have any size, shape or structure.Equally, can be connected to can be on the fuel supplying of combustion zone 35 internal combustion for fuel inlet 20.Fuel can be ejected in the combustion zone 35, so that mix with air stream.
Igniter 45 can be positioned on the downstream of air intake 15 and fuel inlet 20.Igniter 45 can be connected on the controller, so that time as expected and order are moved igniter 45, and feedback signal is provided, with the monitoring overall operation.As described in top, can use the igniter 45 of any kind in this article.Fuel and air can be lighted by igniter 45, become combustion flow, so that produce synthetic detonation wave.Can use other member and other structure in this article.Can use the pulse-knocking burner 10 of any kind in this article.
Fig. 2 and 3 has shown the pulse-knocking burner heat exchanger 100 as describing in this article.Pulse-knocking burner heat exchanger 100 can comprise the many pulse-knocking burners 110 that are positioned at wherein.As described in top, each pulse-knocking burner 110 is included in the combustion tube 120 that wherein limits combustion zone 130.Each pulse-knocking burner 110 also comprises air intake 140, fuel inlet 150 and igniter 160.Can use other member and other structure in this article.Air and fuel are lighted by igniter 160 and in the combustion zone 130 of each combustion tube 120, are produced burning gases stream 170.
Pulse-knocking combustion heat interchanger 100 comprises outside cabin 180.Pulse-knocking burner 110 is positioned in the outside cabin 180.Pulse-knocking burner heat exchanger 100 also comprises the one or more inner passages 190 that extend through outside cabin 180.These one or more inner passages 190 can be the transmission structure of one or more chamber 195, a series of pipe and similar type.Inner passage 190 can extend to heat outlet 210 from cold inlet 200.Inner passage 190 can be positioned on a pair of collector 220 around.Also can around cold inlet 200, use preheater 230.Inner passage 190 can be positioned on pulse-knocking burner 110 combustion tube 120 around.The location can be cross-current orientation, coflow orientation, the directed or any desired stream orientation of adverse current.Working media 240 can flow through inner passage 190.Working media 240 can be gas or the liquid that heat absorption is arrived any kind wherein.
In use, pulse-knocking burner 110 produces the burning gases 170 of heat in the combustion zone 130 of each combustion tube 120.Equally, working media 240 gets into outside cabin 180 through cold inlet 200.Working media 240 and burning gases 170 exchanged heats, and heated by burning gases 170.240 of the working medias of heat pass heat outlet 210 now, in results (harvesting) device of turbine or other type, to carry out useful work.Also can discharge burning gases 170 and be used for preheater, superheater, economizer etc. in downstream.Also can be with inner passage 190 as the device that stops its heat transfer.
Thereby the generation of burning gases 170 can improve from combustion tube 120 to working media 240 rate of heat transfer.The pinking situation can produce the shock wave of the protective layer of the inactive gas wiped on the tube wall or particulate, so that improve the speed of conducting heat.Use pulse-knocking burner 110 also will reduce the incrustation of inner passage 190.Pulse-knocking burner 110 also has less unburned fuel, so that reduce whole discharging.
Figure 4 and 5 have shown the alternative of pulse-knocking burner heat exchanger 100.In this instance, shown pulse-knocking burner boiler 250.The same, pulse-knocking burner boiler 250 comprises many pulse-knocking burners 110.Each pulse-knocking burner 110 comprises combustion tube 120, so that limit combustion zone 130.Each pulse-knocking burner 110 also comprises air intake 140, fuel inlet 150 and igniter 160, so that produce burning gases stream 170.
Pulse-knocking burner boiler 250 also comprises the many boiler tubes 260 that are communicated with a pair of collector 270.The heat exchanger of economizer 280 or other type can be positioned on the downstream of boiler tube 260.Many combustion tubes 120 can be located along a direction, and other many combustion tubes 120 are along opposite direction location.Boiler tube 260 can the directed location of cross-current.Can use the stream of any kind directed in this article.
In use, pulse-knocking burner 110 produces the burning gases stream 170 of heat around the economizer 280 in boiler tube 260 and downstream in the combustion zone 130 of each combustion tube 120.Thereby heat exchanges through cold working media 240, and cold working media 240 arrives bottom water collector 270 from economizer 280 through tube connector, and arrives overhead vapor collectors 270 through boiler tube 260 then.The working media 240 or the steam of heat can flow to the next stop from top header 270 then now, carry out useful work with the harvesting apparatus through turbine or other type.Can after economizer 280, discharge burning gases 170 equally uses in downstream.Can use other member and other structure in this article.
Should it is obvious that; Aforementioned content only relates to some embodiment of the application; And those of ordinary skills can make many changes and modification in this article, and do not depart from cardinal principle spirit of the present invention and the scope that is limited accompanying claims and equivalents thereof.
Claims (11)
1. a pulse-knocking burner heat exchanger (100) comprising:
One or more pulse-knocking burners (110), said one or more pulse-knocking burners (110) produce burning gases (170) therein;
Be positioned at one or more inner passages (190) on every side of said one or more pulse-knocking burners (110); And
Working media (240), it flows in said one or more inner passages (190) so that with said one or more pulse-knocking burners (110) in said burning gases (170) exchanged heat.
2. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said one or more pulse-knocking burners (110) comprise the combustion tube (120) that limits combustion zone (130).
3. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said one or more pulse-knocking burners (110) comprise air intake (140), fuel inlet (150) and igniter (160).
4. pulse-knocking burner heat exchanger according to claim 1 (100); It is characterized in that said pulse-knocking burner heat exchanger (100) further comprises the outside cabin (180) that surrounds said one or more pulse-knocking burners (110) and said one or more inner passage (190).
5. pulse-knocking burner heat exchanger according to claim 4 (100) is characterized in that, said outside cabin (180) comprises cold inlet (200) and the heat outlet (210) that is communicated with said one or more inner passages (190).
6. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said one or more inner passages (190) comprise one or more interior chamber (195).
7. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said one or more inner passages (190) comprise a plurality of collectors (220).
8. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said one or more inner passages (190) comprise a plurality of pipes (260).
9. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said one or more pulse-knocking burners (110) and said one or more inner passage (190) comprise that coflow is directed, adverse current is directed or cross-current is directed.
10. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said pulse-knocking burner heat exchanger (100) further comprises preheater (230).
11. pulse-knocking burner heat exchanger according to claim 1 (100) is characterized in that, said pulse-knocking burner heat exchanger (100) further comprises economizer (280).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/027318 | 2011-02-15 | ||
| US13/027,318 US20120204814A1 (en) | 2011-02-15 | 2011-02-15 | Pulse Detonation Combustor Heat Exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102679306A true CN102679306A (en) | 2012-09-19 |
Family
ID=45896639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100403925A Pending CN102679306A (en) | 2011-02-15 | 2012-02-14 | Pulse detonation combustor heat exchanger |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20120204814A1 (en) |
| CN (1) | CN102679306A (en) |
| GB (1) | GB2488207A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066089A (en) * | 2015-08-14 | 2015-11-18 | 曾志伟 | Boiler |
| CN109556101A (en) * | 2018-11-14 | 2019-04-02 | 陈婧琪 | A kind of more backhaul gas-steam boilers |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103347601B (en) | 2010-11-05 | 2015-04-22 | 国际热化学恢复股份有限公司 | Solids circulation system and method for capture and conversion of reactive solid |
| AU2012315914B2 (en) | 2011-09-27 | 2015-07-09 | Thermochem Recovery International, Inc. | System and method for syngas clean-up |
| US20140360203A1 (en) * | 2011-12-29 | 2014-12-11 | Delafield Pty Ltd | Rijke type combustion arrangement and method |
| CA3014874C (en) | 2016-02-16 | 2019-03-19 | Thermochem Recovery International, Inc. | Two-stage energy-integrated product gas generation system and method |
| CN109153929B (en) | 2016-03-25 | 2019-12-20 | 国际热化学恢复股份有限公司 | Three-stage energy integrated product gas generation system and method |
| US10364398B2 (en) | 2016-08-30 | 2019-07-30 | Thermochem Recovery International, Inc. | Method of producing product gas from multiple carbonaceous feedstock streams mixed with a reduced-pressure mixing gas |
| US9920926B1 (en) * | 2017-07-10 | 2018-03-20 | Thermochem Recovery International, Inc. | Pulse combustion heat exchanger system and method |
| US10099200B1 (en) | 2017-10-24 | 2018-10-16 | Thermochem Recovery International, Inc. | Liquid fuel production system having parallel product gas generation |
| US11555157B2 (en) | 2020-03-10 | 2023-01-17 | Thermochem Recovery International, Inc. | System and method for liquid fuel production from carbonaceous materials using recycled conditioned syngas |
| US11466223B2 (en) | 2020-09-04 | 2022-10-11 | Thermochem Recovery International, Inc. | Two-stage syngas production with separate char and product gas inputs into the second stage |
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- 2011-02-15 US US13/027,318 patent/US20120204814A1/en not_active Abandoned
-
2012
- 2012-02-06 GB GB1201959.2A patent/GB2488207A/en not_active Withdrawn
- 2012-02-14 CN CN2012100403925A patent/CN102679306A/en active Pending
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|---|---|---|---|---|
| US4569310A (en) * | 1980-12-22 | 1986-02-11 | Arkansas Patents, Inc. | Pulsing combustion |
| US4926798A (en) * | 1988-08-05 | 1990-05-22 | Gas Research Institute | Process for pulse combustion |
| US5261359A (en) * | 1990-09-13 | 1993-11-16 | Hull Francis R | Reciprocating 2-stroke cycle internal combustion engine |
| CN101881238A (en) * | 2010-06-10 | 2010-11-10 | 西北工业大学 | Air-breathing pulse detonation engine and detonation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066089A (en) * | 2015-08-14 | 2015-11-18 | 曾志伟 | Boiler |
| CN109556101A (en) * | 2018-11-14 | 2019-04-02 | 陈婧琪 | A kind of more backhaul gas-steam boilers |
| CN109556101B (en) * | 2018-11-14 | 2019-12-13 | 南京太旺化工有限公司 | Multi-return stroke gas-steam boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2488207A (en) | 2012-08-22 |
| US20120204814A1 (en) | 2012-08-16 |
| GB201201959D0 (en) | 2012-03-21 |
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