EP2236953A2 - Device for heating air during the duty cycle of a heatig boiler - Google Patents
Device for heating air during the duty cycle of a heatig boiler Download PDFInfo
- Publication number
- EP2236953A2 EP2236953A2 EP10460003A EP10460003A EP2236953A2 EP 2236953 A2 EP2236953 A2 EP 2236953A2 EP 10460003 A EP10460003 A EP 10460003A EP 10460003 A EP10460003 A EP 10460003A EP 2236953 A2 EP2236953 A2 EP 2236953A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- conduit
- air
- exhaust gas
- conduits
- boiler
- 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.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H6/00—Combined water and air heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
- F28D21/0008—Air heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/06—Solid fuel fired boiler
Definitions
- the subject of the invention is a device for heating air during the duty cycle of a heating boiler, especially central heating water boilers fired by solid fuel or biomass.
- the Polish patent application No. P. 378703 refers to an environment-friendly central heating water boiler fired by solid fuels, especially wood and coal, designed for providing central heating in residential houses and other objects.
- the water jacket surrounding the combustion chamber, housed within the boiler's body, is additionally heated from the outside by exhaust gas which escapes through exhaust gas partitions surrounding the water jacket.
- the exhaust gas partitions are thermally insulated by chamotte bricks and mineral wool mattings.
- polish patent application No. P. 380100 refers to the method of combustion and the combustion boiler which reduces the emission of nitrogen oxides in the exhaust gas from the solid fuel boiler with a retort burner by decreasing the temperature at the flame core. This is achieved using a stream of recirculated exhaust gas, a mixture of exhaust gas and air, steam or a mixture of steam and air flowing to the retort burner or to the combustion chamber directly over the flame, pumped by a fan through a moving recirculation pipe, nozzles installed in the boiler's ceiling, or nozzles located around the retort burner, or through the combined solutions.
- Water boiler for solid fuel is fitted with a body and a vault housing a water jacket, under which the combustion chamber is located.
- the vault housing the water jacket is connected to the water chamber of the boiler's body.
- Lower arm sections of the body are fitted with conduits for a portion of overfire air, whose volume is adjusted by rotary flaps actuated by the lower electric stepper motor.
- the upper section of the recuperation combustion chamber is fitted with an inlet conduit for additional overfire air, whose volume is adjusted by a flap actuated by the upper electric stepper motor.
- the grate tubes located under the vault with the water jacket are cooled using water and cleaned by scrapers between the grate tubes driven by a linear electromagnetic drive unit.
- the exhaust gas collector is fitted with an oxygen probe which controls the stepper motors to ensure a very low level of toxic substances in the exhaust gas.
- the boiler can be fitted with an automatic fuel feeder and a laser sensor for detecting whether a specific upper fuel level in the recuperation combustion chamber has been reached, as well as a second laser sensor for detecting whether the lower fuel level in the recuperation combustion chamber has been reached and for actuating the automatic fuel feeder.
- Another known device mentioned in the Polish patent application No. P. 381355 refers to a central heating water boiler fitted with a system for supplying primary and overfire air to the combustion chamber.
- the system is composed of pumping nozzles on the boiler's sides.
- the nozzles work with a blow-in fan installed in the air conduit pumping the air into the area between the water jacket and the outer jacket.
- the pumping nozzles are fixed tubes installed between the walls of the water jacket and they connect the combustion chamber with the area between the water jacket and the outer jacket. The number of the pumping nozzles depends on the boiler's size and capacity.
- the Polish patent application No. P. 368210 refers to a heating boiler fitted with a furnace chamber and a furnace, a blower for supplying compressed air and a fuel feeder.
- a heat exchanger in the shape of a boiler drum with internal rings formed by the fitted vertical exhaust pipes.
- the pipes located radially around the longitudinal axis of the heat exchanger and in the water jacket, with at least one external ring formed by exhaust pipes whose outlets are connected directly to the boiler's flue section and inlets located over the furnace chamber, below the outlets, forming at least one internal ring of exhaust pipes, whose inlets are located in the exhaust gas return chamber.
- Item known from the Polish patent application No. P. 376356 refers to a water boiler fired with hard coal.
- the boiler is fitted with a heat exchanger with two retort furnaces supplied with fuel through the symmetrical and separate coal supply systems.
- the air required for the combustion process is supplied to the furnace through a symmetrical, double primary air system.
- the air supplied over the furnace comes through a symmetrical, double overfire air system.
- These systems are actuated by separated fans.
- the heat exchanger is connected to the exhaust gas fan through a multicyclone.
- the boiler is an environment-friendly device. It has a two-level furnace and an extended heating surface for producing heat from solid fuels.
- the two-level retort furnace is fitted with air slots, and the symmetrical construction of the collector allows the boiler to be supplied with fuel and air from the right side as well as the left side.
- the heat exchanger composed of multiple parts, forms a single water unit and includes a lower section around the furnace, a middle section formed by the boiler drum with pipes, an upper section around the exhaust gas collector and an external part which forms passage pockets.
- the whole boiler is a uniform, welded construction.
- the Polish patent No. 188246 refers to a heating boiler with gasification, fired by solid fuel, especially wood.
- the heating boiler has a fuel and gasification chamber, with a cross--section in the shape of a pear, which converges in the middle, in the peak line.
- a slotted grate In the peak line area and in the middle, there is a slotted grate with a length of approx. 1/5-1/3 of the peak line.
- Over the grate there are primary air inlet openings on both sides, at approx. 0.4-0.6 of the maximum height of the fuel and gasification chamber.
- Under the grate a slotted combustion nozzle is installed. It is roughly equal in length to the grate and constitutes a connection with the combustion chamber.
- the combustion chamber is divided by a slightly inclined horizontal wall into pre-combustion and mixing chamber and a post--combustion chamber located underneath.
- the cross-section of both chambers resembles kidneys, widening in the flow direction.
- the pre-combustion and mixing chamber is supplied with overfire air supplied by the air supply pipe and air heater.
- there is another post-combustion chamber Between the outlet of the post-combustion chamber and the exhaust gas lines, there is another post-combustion chamber, through which a supply pipe for overfire air is guided to the air heater.
- the subject of the invention is a device for heating air during the duty cycle of a heating boiler fired in particular by solid fuel or biomass, composed of a conduit for supplying air to the furnace and a conduit for outflow the exhaust gas from the heating boiler into the flue, characterised in that the device has the closed exhaust gas conduit which over the length of its connection with the flue is shaped resembling a cosine curve with advantageously vertical exhaust gas conduits adhered to the vertical air conduits which over the length of the air conduit have a shape resembling a sine curve, and on the last vertical conduit, where the end section of the exhaust gas conduit is guided to the flue, there is a pumping fan.
- the closed exhaust gas conduit in the shape resembling a cosine curve has vertical exhaust gas conduits which decrease in volume in the flue direction, and the air conduit in the shape resembling a sine curve has vertical air conduits which increase in volume in the boiler direction.
- Inside the vertical air conduits there are air guides.
- the vertical air conduits, alternatingly in the bent sections, have lower and upper mesh connections which are advantageously shaped as cylindrical conduits.
- the air conduit is advantageously guided to the heating boiler's ash-pan.
- the vertical air conduits have condensate drain outlets in the lower section.
- the invention uses heat from the boiler's smoke conduit, from other gasses forced into the atmosphere during the combustion process as well as heat forced into the atmosphere from other devices, which is intended to be reused.
- the device as per the invention allows heat from the exhaust gas to be used for heating air supplied to the boiler's ash-pan.
- the recovery of heat from the exhaust gas begins by being pumped through a separate air conduit in the direction opposite to the flow of hot gasses.
- the air conduit in the heat reversing mechanism starts absorbing heat from the outlet conduit of the exhaust gas into the flue and ends at the boiler's smoke conduit.
- Heat is re-introduced into the boiler through the ash-pan. It can be alternatively used for heating another heat exchanger or for heating rooms by air blow.
- the high heat recovery rate (90%) ensured by the device used in a household central heating boiler room will provide fuel savings of 50-60%.
- This device can be used in industrial boiler rooms and for recovering heat from other devices which release used heat directly into the atmosphere.
- the device may achieve a 90% reduction of exhaust gas and heat emission into the atmosphere by using a heat reversing mechanism.
- the device has undergone technical tests. It is currently used in the boiler room of a single-family house and meets the requirements for reducing heat emission into the atmosphere.
- the construction example of the invention is composed of a conduit for supplying air (3) to the furnace of the heating boiler (1) and a conduit for outflow the exhaust gas (2) from the heating boiler (1) into the flue (8).
- the device has the closed exhaust gas conduit (2) which over the length of its connection with the flue (8) is shaped resembling a cosine curve with vertical exhaust gas conduits (4) adhered to the vertical air conduits (11) which over the length of the air conduit (3) have a shape resembling a sine curve, and on the last vertical conduit (5), where the end section (7) of the exhaust gas conduit (2) is guided to the flue (8), there is a pumping fan (6).
- the closed exhaust gas conduit (2) in the shape resembling a cosine curve has vertical exhaust gas conduits (4) which decrease in volume in the flue (8) direction
- the air conduit (3) in the shape resembling a sine curve has vertical air conduits (11) which increase in volume in the boiler (1) direction.
- Inside the vertical air conduits (11) there are air guides (9).
- the vertical air conduits (11), alternatingly in the bent sections, have lower mesh connection (13) shaped as cylindrical conduits and upper mesh connection (14) shaped as cylindrical conduits.
- the air conduit (3) is guided to the heating boiler's (1) ash-pan (12).
- the vertical air conduits (11) in the lower section are fitted with drain outlets (10) for condensate produced as a result of the difference in temperature between the air and the exhaust gas.
Abstract
Description
- The subject of the invention is a device for heating air during the duty cycle of a heating boiler, especially central heating water boilers fired by solid fuel or biomass.
- The Polish patent application No.
P. 378703 - Another known device mentioned in the Polish patent application No.
P. 380100 - Water boiler for solid fuel, especially for biomass, known from the Polish patent application No.
P. 381102 - Another known device mentioned in the Polish patent application No.
P. 381355 - The Polish patent application No.
P. 368210 - Item known from the Polish patent application No.
P. 376356 - Another known device mentioned in the Polish patent No.
196625 - Item known from the Polish patent No.
192574 - The Polish patent No.
188246 - The subject of the invention is a device for heating air during the duty cycle of a heating boiler fired in particular by solid fuel or biomass, composed of a conduit for supplying air to the furnace and a conduit for outflow the exhaust gas from the heating boiler into the flue, characterised in that the device has the closed exhaust gas conduit which over the length of its connection with the flue is shaped resembling a cosine curve with advantageously vertical exhaust gas conduits adhered to the vertical air conduits which over the length of the air conduit have a shape resembling a sine curve, and on the last vertical conduit, where the end section of the exhaust gas conduit is guided to the flue, there is a pumping fan. The closed exhaust gas conduit in the shape resembling a cosine curve has vertical exhaust gas conduits which decrease in volume in the flue direction, and the air conduit in the shape resembling a sine curve has vertical air conduits which increase in volume in the boiler direction. Inside the vertical air conduits there are air guides. The vertical air conduits, alternatingly in the bent sections, have lower and upper mesh connections which are advantageously shaped as cylindrical conduits. The air conduit is advantageously guided to the heating boiler's ash-pan. The vertical air conduits have condensate drain outlets in the lower section.
- The invention uses heat from the boiler's smoke conduit, from other gasses forced into the atmosphere during the combustion process as well as heat forced into the atmosphere from other devices, which is intended to be reused. The device as per the invention allows heat from the exhaust gas to be used for heating air supplied to the boiler's ash-pan. The recovery of heat from the exhaust gas begins by being pumped through a separate air conduit in the direction opposite to the flow of hot gasses. The air conduit in the heat reversing mechanism starts absorbing heat from the outlet conduit of the exhaust gas into the flue and ends at the boiler's smoke conduit. Such a construction of the device and method of reusing heat from exhaust gas allows hot air to be supplied to the boiler's combustion chamber, leading to better boiler efficiency. Heat is re-introduced into the boiler through the ash-pan. It can be alternatively used for heating another heat exchanger or for heating rooms by air blow. The high heat recovery rate (90%) ensured by the device used in a household central heating boiler room will provide fuel savings of 50-60%. This device can be used in industrial boiler rooms and for recovering heat from other devices which release used heat directly into the atmosphere.
- At this time of combating climatic warming, the device may achieve a 90% reduction of exhaust gas and heat emission into the atmosphere by using a heat reversing mechanism.
- The device has undergone technical tests. It is currently used in the boiler room of a single-family house and meets the requirements for reducing heat emission into the atmosphere.
- The subject of the invention is presented in the example drawing showing the connection system of two shaped conduits: exhaust gas conduit and air conduit.
- The construction example of the invention is composed of a conduit for supplying air (3) to the furnace of the heating boiler (1) and a conduit for outflow the exhaust gas (2) from the heating boiler (1) into the flue (8). The device has the closed exhaust gas conduit (2) which over the length of its connection with the flue (8) is shaped resembling a cosine curve with vertical exhaust gas conduits (4) adhered to the vertical air conduits (11) which over the length of the air conduit (3) have a shape resembling a sine curve, and on the last vertical conduit (5), where the end section (7) of the exhaust gas conduit (2) is guided to the flue (8), there is a pumping fan (6). The closed exhaust gas conduit (2) in the shape resembling a cosine curve has vertical exhaust gas conduits (4) which decrease in volume in the flue (8) direction, and the air conduit (3) in the shape resembling a sine curve has vertical air conduits (11) which increase in volume in the boiler (1) direction. Inside the vertical air conduits (11) there are air guides (9). The vertical air conduits (11), alternatingly in the bent sections, have lower mesh connection (13) shaped as cylindrical conduits and upper mesh connection (14) shaped as cylindrical conduits. The air conduit (3) is guided to the heating boiler's (1) ash-pan (12). The vertical air conduits (11) in the lower section are fitted with drain outlets (10) for condensate produced as a result of the difference in temperature between the air and the exhaust gas.
Claims (7)
- Device for heating air during the duty cycle of a heating boiler fired in particular by solid fuel or biomass, composed of a conduit for supplying air to the furnace and a conduit for outflow the exhaust gas from the heating boiler into the flue, characterised in that the device has the closed exhaust gas conduit (2) which over the length of its connection with the flue (8) is shaped resembling a cosine curve with advantageously vertical exhaust gas conduits (4) adhered to the vertical air conduits (11) which over the length of the air conduit (3) have a shape resembling a sine curve, and on the last vertical conduit (5), where the end section (7) of the exhaust gas conduit (2) is guided to the flue (8), there is a pumping fan (6).
- The device, according to the claim 1, characterised in that the closed exhaust gas conduit (2) in the shape resembling a cosine curve has vertical exhaust gas conduits (4) which decrease in volume in the flue (8) direction, and the air conduit (3) in the shape resembling a sine curve has vertical air conduits (11) which increase in volume in the boiler (1) direction.
- The device, according to the claim 1, characterised in that inside the vertical air conduits (11) there are air guides (9).
- The device, according to the claim 1, characterised in that the vertical air conduits (11), alternatingly in the bent sections, have lower mesh connection (13) and upper mesh connection (14).
- The device, according to the claim 4, characterised in that the lower mesh connection (13) and the upper mesh connection (14) have the shape of cylindrical conduits.
- The device, according to the claim 1, characterised in that the air conduit (3) is advantageously guided to the heating boiler's (1) ash-pan (12).
- The device, according to the claim 1, characterised in that the vertical air conduits (11) have condensate drain outlets (10) in the lower section.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL387357A PL222775B1 (en) | 2009-03-12 | 2009-03-12 | Device for heating-up air in the heating boiler operating system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2236953A2 true EP2236953A2 (en) | 2010-10-06 |
EP2236953A3 EP2236953A3 (en) | 2011-01-19 |
Family
ID=42288489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10460003A Withdrawn EP2236953A3 (en) | 2009-03-12 | 2010-02-15 | Device for heating air during the duty cycle of a heatig boiler |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100233641A1 (en) |
EP (1) | EP2236953A3 (en) |
JP (1) | JP2010266184A (en) |
PL (1) | PL222775B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103322674A (en) * | 2013-06-19 | 2013-09-25 | 刘兴 | Horizontal hot-air environment-friendly boiler dedicated to agriculture |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120208140A1 (en) * | 2009-03-12 | 2012-08-16 | Invention Mind, Sp. Z.O.O. | Device for heating air during the duty cycle of a combustion furnace |
CN105135464B (en) * | 2015-10-12 | 2018-04-03 | 深圳市山水乐环保科技有限公司 | The configuration device and method of boiler secondary air |
CN109812969A (en) * | 2018-12-25 | 2019-05-28 | 三江县浩然再生能源科技开发有限公司 | A kind of power economized boiler |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1562693A (en) * | 1967-05-17 | 1969-02-24 | ||
US5295473A (en) * | 1992-03-18 | 1994-03-22 | Neufeldt Jacob J | Furnace |
US5394860A (en) * | 1994-05-16 | 1995-03-07 | Borle; Del | Method of connecting a heat exchanger to a forced air furnace and related valve |
US6357396B1 (en) * | 2000-06-15 | 2002-03-19 | Aqua-Chem, Inc. | Plate type heat exchanger for exhaust gas heat recovery |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US222207A (en) * | 1879-12-02 | Improvement in ventilators | ||
US1841528A (en) * | 1930-02-03 | 1932-01-19 | Gebhardt Co | Heat transfer apparatus |
US1989340A (en) * | 1932-10-18 | 1935-01-29 | Allan T Shepherd | Apparatus for recovering heat from waste water |
US2244936A (en) * | 1940-03-04 | 1941-06-10 | Bird Charles | Draft control and fly ash separator |
US3872689A (en) * | 1974-05-02 | 1975-03-25 | Edward W Bottum | Suction accumulator |
JPS5121012A (en) * | 1974-08-14 | 1976-02-19 | Hitachi Ltd | |
US4171089A (en) * | 1977-05-19 | 1979-10-16 | George W. Schossow | Heat exchanger |
US4416254A (en) * | 1980-05-02 | 1983-11-22 | Dipietro Raymond B | Flue structure for domestic heating equipment |
JPS5733746A (en) * | 1980-08-05 | 1982-02-23 | Corona Kogyo Kk | Hot air device using solid fuel |
JPS5790508A (en) * | 1980-11-26 | 1982-06-05 | Kobe Steel Ltd | Combustion apparatus for solid fuel |
JPS5918116U (en) * | 1982-07-26 | 1984-02-03 | 株式会社正英製作所 | Solid fuel combustion equipment |
JPS6136606A (en) * | 1984-07-27 | 1986-02-21 | Takeshi Hara | Combusting device for wooden solid fuel |
JPH0247409Y2 (en) * | 1985-06-21 | 1990-12-13 | ||
US4861348A (en) * | 1986-10-08 | 1989-08-29 | Hitachi, Ltd. | Fuel reforming apparatus |
DE3703855A1 (en) * | 1987-02-07 | 1988-08-18 | Gutehoffnungshuette Man | COMBUSTION PLANT FOR WASTE |
JPH01234713A (en) * | 1988-03-16 | 1989-09-20 | Ngk Insulators Ltd | Temperature control of incinerator |
GB8812251D0 (en) * | 1988-05-24 | 1988-06-29 | Stelrad Group Ltd | Bottles |
JP3599477B2 (en) * | 1996-04-08 | 2004-12-08 | 財団法人石油産業活性化センター | Combustion equipment |
JPH10160112A (en) * | 1996-12-02 | 1998-06-19 | Tokyo Gas Co Ltd | Boiler with highly efficient low nox combustion apparatus |
US5735680A (en) * | 1997-03-13 | 1998-04-07 | Applied Web Systems, Inc. | Fume incineration |
PT1139055E (en) * | 2000-03-29 | 2003-02-28 | Sgl Acotec Gmbh | HEAT EXCHANGER WITH MULTIPLE PIPE SEALS |
JP2005308372A (en) * | 2004-04-26 | 2005-11-04 | Ishikawajima Harima Heavy Ind Co Ltd | Fluidized bed furnace |
JP2006191876A (en) * | 2005-01-14 | 2006-07-27 | Mitsubishi Heavy Ind Ltd | System for utilizing biomass |
JP2007132588A (en) * | 2005-11-10 | 2007-05-31 | Create Thema:Kk | Combustion chamber structure for woody material |
JP4958084B2 (en) * | 2007-02-10 | 2012-06-20 | 国立大学法人愛媛大学 | Woody biomass heating system |
-
2009
- 2009-03-12 PL PL387357A patent/PL222775B1/en unknown
-
2010
- 2010-02-15 EP EP10460003A patent/EP2236953A3/en not_active Withdrawn
- 2010-03-11 JP JP2010055053A patent/JP2010266184A/en active Pending
- 2010-03-12 US US12/722,555 patent/US20100233641A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1562693A (en) * | 1967-05-17 | 1969-02-24 | ||
US5295473A (en) * | 1992-03-18 | 1994-03-22 | Neufeldt Jacob J | Furnace |
US5394860A (en) * | 1994-05-16 | 1995-03-07 | Borle; Del | Method of connecting a heat exchanger to a forced air furnace and related valve |
US6357396B1 (en) * | 2000-06-15 | 2002-03-19 | Aqua-Chem, Inc. | Plate type heat exchanger for exhaust gas heat recovery |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103322674A (en) * | 2013-06-19 | 2013-09-25 | 刘兴 | Horizontal hot-air environment-friendly boiler dedicated to agriculture |
CN103322674B (en) * | 2013-06-19 | 2015-08-12 | 刘兴 | Horizontal agriculture special hot environmental protection boiler |
Also Published As
Publication number | Publication date |
---|---|
PL387357A1 (en) | 2010-09-13 |
PL222775B1 (en) | 2016-09-30 |
JP2010266184A (en) | 2010-11-25 |
EP2236953A3 (en) | 2011-01-19 |
US20100233641A1 (en) | 2010-09-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
RU2604577C2 (en) | Mine ventilation air heating method and device for its implementation | |
CN201203263Y (en) | Tube arranging type hot-air stove | |
EP2236953A2 (en) | Device for heating air during the duty cycle of a heatig boiler | |
EP2884200A1 (en) | Central heating boiler | |
CN101131255A (en) | Heat pipe hot-blast stove using biomass energy resource | |
JP2010266184A5 (en) | ||
CN201259303Y (en) | Coal briquette energy-conserving environment protection water heater | |
CN1945182B (en) | Coal burning hot-blast stove | |
RU2578501C1 (en) | External boiler | |
US20120208140A1 (en) | Device for heating air during the duty cycle of a combustion furnace | |
CN2919159Y (en) | Heat conducting oil heating heat furnace | |
CN2092063U (en) | High-efficiency horizontal hot-blast stove burning coal | |
CN211822343U (en) | Efficient energy-saving biomass boiler | |
CN201203329Y (en) | Baking room and heating device thereof | |
CN201081400Y (en) | Indirect air-flow hot-blast stove | |
RU151386U1 (en) | WATER BOILER | |
CN103206787A (en) | Environmental protection type heat conducting oil circulation heater | |
RU202092U1 (en) | Water heating boiler | |
CN101526264B (en) | Energy-saving high-efficiency environment-friendly boiler | |
CN201407806Y (en) | Energy-saving, efficient and environment-friendly boiler | |
CN101666541B (en) | Double-medium hot-blast furnace | |
CN2881498Y (en) | Hot air furnace | |
RU43951U1 (en) | WATER BOILER | |
KR20100081560A (en) | Retort-typed pellet boiler with dual-combustor | |
CN101358769A (en) | Heating apparatus for oil and water mixture fire coal circulating fluidized bed |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA RS |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA RS |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: F28D 21/00 20060101ALI20101214BHEP Ipc: F24H 6/00 20060101AFI20100706BHEP |
|
17P | Request for examination filed |
Effective date: 20110708 |
|
17Q | First examination report despatched |
Effective date: 20130422 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20140829 |