CN104930496B - Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit - Google Patents

Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit Download PDF

Info

Publication number
CN104930496B
CN104930496B CN201510302777.8A CN201510302777A CN104930496B CN 104930496 B CN104930496 B CN 104930496B CN 201510302777 A CN201510302777 A CN 201510302777A CN 104930496 B CN104930496 B CN 104930496B
Authority
CN
China
Prior art keywords
low
economizer
gas
stack
level
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.)
Active
Application number
CN201510302777.8A
Other languages
Chinese (zh)
Other versions
CN104930496A (en
Inventor
张华东
李忠江
齐林虎
黄新元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
Original Assignee
SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd filed Critical SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
Priority to CN201510302777.8A priority Critical patent/CN104930496B/en
Publication of CN104930496A publication Critical patent/CN104930496A/en
Application granted granted Critical
Publication of CN104930496B publication Critical patent/CN104930496B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention relates to the field of smoke exhaust waste heat utilization of a boiler, and particularly discloses a combined air supply heating depth waste heat recycling system of a low-low-temperature economizer of a coal-fired unit. The waste heat recycling system is characterized in that a low-low-temperature economizer high-temperature segment is arranged in a front flue of an electrostatic precipitator, and a low-low-temperature economizer low-temperature segment is arranged at the position from an induced draft fan outlet to a desulfurizing tower inlet flue; the low-low-temperature economizer high-temperature segment is connected with a condensate pipeline of a condenser, and the low-low-temperature economizer low-temperature segment is in parallel connection with a primary air heater and a secondary air heater through low-low-temperature economizer low-temperature segment water outlet pipelines; and the water outlet pipeline of the primary air heater and the water outlet pipeline of the secondary air heater are communicated with a low-low-temperature economizer low-temperature segment water returning pipeline of the low-low-temperature economizer low-temperature segment. The temperature of the smoke of the desulfurizing tower inlet is reduced to about 50 DEG C, coal saving benefits are obtained, meanwhile, the water consumption of a desulfurizing tower is reduced, and the whole running benefits of a power plant is greatly improved.

Description

The low low-level (stack-gas) economizer joint air-supply heat penetration residual neat recovering system of coal unit
(One)Technical field
The present invention relates to boiler exhaust gas field of waste heat utilization, the low low-level (stack-gas) economizer of more particularly to a kind of coal unit is combined and is sent Wind heat penetration residual neat recovering system.
(Two)Background technology
Current minimum to 90 DEG C or so of country's conventional low voltage economizer cooling extent, the low-temperature zone of heating surface generally requires to adopt The problems such as can meeting cold end corrosion with steel alloy.National new 2014-2020 " coal electricity energy-saving and emission-reduction upgrading and the transformation put into effect Action plan " requires that active service unit net coal consumption rate is reached advanced world standards, and this is accomplished by boiler exhaust gas heat recovery skill Art will have new breakthrough in deeply reducing exhausted smoke temperature.
In addition the optimal reaction temperature of wet desulphurization is 50 DEG C or so, and the flue gas of higher cigarette temperature enters desulphurization system, can lead The increase of desulfurization water consumption is caused, and then the increase of chimney water capacity, chimney is reduced from pull out force.By the way that flue-gas temperature depth is reduced to 50 DEG C or so, can Mist heat recovering in a large number, reduce desulfurization water consumption, effectively improve power plant's overall operation benefit.
(Three)The content of the invention
The present invention is in order to make up the deficiencies in the prior art, there is provided one kind reduces desulfurizing tower water consumption, improves efficiency of dust collection Coal unit low low-level (stack-gas) economizer joint air-supply heat penetration residual neat recovering system.
The present invention is achieved through the following technical solutions:
A kind of low low-level (stack-gas) economizer joint air-supply heat penetration residual neat recovering system of coal unit, it is characterised in that:Quiet Low low-level (stack-gas) economizer high temperature section is installed before electric cleaner in flue, is exported in desulfurizing tower gas approach in air-introduced machine and is installed low Warm economizer low-temperature zone, arranges First air steam air heater in an air channel, and Secondary Air steam air heater is arranged in secondary air duct, low Warm economizer high temperature section is connected with condenser condensed water pipeline, and low low-level (stack-gas) economizer low-temperature zone is by low low-level (stack-gas) economizer low-temperature zone Outlet conduit is connected in parallel respectively with First air steam air heater and Secondary Air steam air heater, First air steam air heater and Secondary Air steam air heater Outlet conduit is connected with the low low-level (stack-gas) economizer low-temperature zone water return pipeline of low low-level (stack-gas) economizer low-temperature zone.
Low low-level (stack-gas) economizer low-temperature zone outlet recirculated water Jing circulating pumps flow into First air and Secondary Air steam air heater, Jing coiled pipes Drainage enters steam air heater outlet header, and low low-level (stack-gas) economizer low-temperature zone water return pipeline, shape are flowed into Jing after steam air heater water return pipeline collects Into a closed cycle water route.
The present invention more excellent scheme be:
The low low-level (stack-gas) economizer high temperature section installs booster on low low-level (stack-gas) economizer inlet channel and enters Water Check Valve, Low low-level (stack-gas) economizer inlet channel exports inlet valve and connects two with low-pressure heater entrance inlet valve by low-pressure heater The low-pressure heater of series connection, low-pressure heater connection condenser;The low low-level (stack-gas) economizer return pipe of low low-level (stack-gas) economizer high temperature section Road connects oxygen-eliminating device by low low-level (stack-gas) economizer water return pipeline valve.
Take and low plus heat regenerative system quoted from low plus entrance and low plus outlet conduit the high temperature section water side of low low-level (stack-gas) economizer Mode in parallel.The low-pressure heater main condensate drawn by condensate system, the low low-level (stack-gas) economizer inlet channel boosters of Jing Boosting, the low low-level (stack-gas) economizer high temperature section entrance headers of Jing enter low low-level (stack-gas) economizer high temperature section, and Jing snake-like tube rows flow into low temperature Economizer high temperature section outlet header, by low low-level (stack-gas) economizer water return pipeline condensate system is entered.
Low low-level (stack-gas) economizer high temperature section entrance header is provided with the low low-level (stack-gas) economizer high temperature section and low temperature saves coal Device high temperature section outlet header, is provided with low low-level (stack-gas) economizer low-temperature zone entrance header and low temperature in low low-level (stack-gas) economizer low-temperature zone Economizer low-temperature zone outlet header.
First air steam air heater entrance header and First air steam air heater outlet header are provided with the First air steam air heater;Two Secondary Air steam air heater entrance header and Secondary Air steam air heater outlet header are provided with secondary wind steam air heater.
First air steam air heater inlet regulating valve is provided with the outlet pipe of the First air steam air heater, Secondary Air steam air heater Secondary Air steam air heater inlet regulating valve is provided with outlet pipe.
The low low-level (stack-gas) economizer high temperature section, low low-level (stack-gas) economizer low-temperature zone, First air steam air heater and Secondary Air steam air heater Body be snake-like tube row, select " H " type extended surface tube.
The smoke discharging residual heat that the present invention is reclaimed is used for two parts, and a part is used for plus Hot gas turbine condensate is realized economizing on coal, Another part is used to heat primary and secondary air, improves the comprehensive tube wall temperature of cold section of air preheater, mitigates cold end blocking and corrodes, Winter alternative conventional steam steam air heater, saves consumption vapour.Enter the raising of stove cold wind temperature, improve boiler efficiency, low low-level (stack-gas) economizer Inlet flue gas temperature and mechanical efficiency are improved therewith.
Desulfurizing tower inlet flue gas temperature depth can be reduced to 50 DEG C or so by the present invention, while benefit of saving coal is obtained, be reduced Desulfurizing tower water consumption, greatly improves power plant's overall operation benefit;In addition electrostatic precipitator inlet flue gas temperature is reduced to 90 DEG C, improves electricity The efficiency of dust collection of deduster.
(Four)Description of the drawings
Below in conjunction with the accompanying drawings the present invention is further illustrated.
Fig. 1 is the structural representation of the present invention.
In figure, 1 low-pressure heater entrance inlet valve, 2 low-pressure heaters outlet inlet valve, 3 enter Water Check Valve, 4 liters Press pump, 5 low low-level (stack-gas) economizer inlet channels, 6 low low-level (stack-gas) economizer high temperature sections, the low low-level (stack-gas) economizer high temperature section entrance headers of 6-1, The low low-level (stack-gas) economizer high temperature section outlet headers of 6-2,7 low low-level (stack-gas) economizer water return pipelines, 8 low low-level (stack-gas) economizer water return pipeline valves Door, 9 low low-level (stack-gas) economizer low-temperature zones, the low low-level (stack-gas) economizer low-temperature zone entrance headers of 9-1,9-2 is low, and low-level (stack-gas) economizer low-temperature zone goes out Mouth header, 10 circulating pumps, 11 low low-level (stack-gas) economizer low-temperature zone outlet conduits, 12 Secondary Air steam air heaters, 13 Secondary Air steam air heaters enter Mouth header, 14 Secondary Air steam air heater outlet headers, 15 First air steam air heaters, 16 First air steam air heater entrance headers, 17 First airs Steam air heater outlet header, 18 Secondary Air steam air heater inlet regulating valves, 19 First air steam air heater inlet regulating valves, 20 low temperature save coal Device low-temperature zone water return pipeline.
(Five)Specific embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.The embodiment installs low temperature province before electrostatic precipitator in flue Coal device high temperature section 6, is exported in desulfurizing tower gas approach in air-introduced machine and installs low low-level (stack-gas) economizer low-temperature zone 9, in an air channel Interior setting First air steam air heater 15, arranges Secondary Air steam air heater 12, low low-level (stack-gas) economizer high temperature section 6 and condensing in secondary air duct Device condensate line connects, and low low-level (stack-gas) economizer low-temperature zone 9 is by low low-level (stack-gas) economizer low-temperature zone outlet conduit 11 respectively with one Secondary wind steam air heater 15 and Secondary Air steam air heater 12 are connected in parallel, the outlet conduit of First air steam air heater 15 and Secondary Air steam air heater 12 Connect with the low low-level (stack-gas) economizer low-temperature zone water return pipeline 20 of low low-level (stack-gas) economizer low-temperature zone 9;The low low-level (stack-gas) economizer high temperature Section 6 installs booster 4 on low low-level (stack-gas) economizer inlet channel 5 and enters Water Check Valve 3, and low low-level (stack-gas) economizer inlet channel 5 leads to Cross the low-pressure heater that low pressure heater outlet inlet valve 2 connects two series connection with low-pressure heater entrance inlet valve 1, low pressure Heater connects condenser;The low low-level (stack-gas) economizer water return pipeline 7 of low low-level (stack-gas) economizer high temperature section 6 is returned by low low-level (stack-gas) economizer Waterpipe valve 8 connects oxygen-eliminating device;Low low-level (stack-gas) economizer high temperature section entrance collection is provided with the low low-level (stack-gas) economizer high temperature section 6 Case 6-1 and low low-level (stack-gas) economizer high temperature section outlet header 6-2, in low low-level (stack-gas) economizer low-temperature zone 9 low low-level (stack-gas) economizer is provided with Low-temperature zone entrance header 9-1 and low low-level (stack-gas) economizer low-temperature zone outlet header 9-2;One is provided with the First air steam air heater 15 Secondary wind steam air heater entrance header 16 and First air steam air heater outlet header 17;Secondary Air warm braw is provided with Secondary Air steam air heater 12 Device entrance header 13 and Secondary Air steam air heater outlet header 14;First air is provided with the outlet pipe of the First air steam air heater 15 Steam air heater inlet regulating valve 19, is provided with Secondary Air steam air heater inlet regulating valve 18 on the outlet pipe of Secondary Air steam air heater 12;Institute State the sheet of low low-level (stack-gas) economizer high temperature section 6, low low-level (stack-gas) economizer low-temperature zone 9, First air steam air heater 15 and Secondary Air steam air heater 12 Body is snake-like tube row, selects " H " type extended surface tube.
Cloth sets low low-level (stack-gas) economizer high temperature section 6, high temperature section water intaking in flue between air preheater and electrostatic precipitator From the import and export of low-pressure heater, it is connected with steam turbine condensate line by low low-level (stack-gas) economizer inlet channel 5, by control Low-pressure heater entrance inlet valve 1 processed and low-pressure heater export the low low-level (stack-gas) economizer high temperature of aperture regulation of inlet valve 2 The inflow temperature of section 6.System water inlet enters high temperature section body by low low-level (stack-gas) economizer high temperature section entrance header 6-1, and Jing is snakelike Pipe enters low low-level (stack-gas) economizer high temperature section outlet header 6-2, is then entered into oxygen-eliminating device by low low-level (stack-gas) economizer water return pipeline 7 Mouthful.
System water route is arranged in parallel with full-flow condensate, and pipeline flow resistance is overcome by booster 4.Low low-level (stack-gas) economizer enters Waterpipe arranges check-valves 3, anti-locking system water route adverse current.Low low-level (stack-gas) economizer water return pipeline 7 arranges low low-level (stack-gas) economizer backwater Pipeline valve 8, is easy to system shutdown.The low body of low-level (stack-gas) economizer high temperature section 6 is snake-like tube row, selects " H " type extended surface tube, is absorbed Cigarette temperature is reduced to 90 DEG C or so by fume afterheat.
Low low-level (stack-gas) economizer low-temperature zone 9 is arranged in desulfurizing tower gas approach, with First air steam air heater 15, Secondary Air warm braw Device 12 constitutes closed circulation system.Top-off cycle water first in system, circulating pump 10 provides circulation power, and recirculated water is in low-temperature zone Interior absorption fume afterheat, the low low-level (stack-gas) economizer low-temperature zone outlet header 9-2 of Jing, low 11 points of low-level (stack-gas) economizer low-temperature zone outlet conduit Not Jin Ru First air steam air heater entrance header 16 and Secondary Air steam air heater entrance header 13, flow through First air steam air heater 15 and secondary The heat release of wind steam air heater 12, then flows into First air steam air heater outlet header 17 and Secondary Air steam air heater outlet header 14, and Jing converges After flow into low temperature steam air heater low-temperature zone water return pipeline 20 and be back to low low-level (stack-gas) economizer low-temperature zone entrance header 9-1.
The body of low-level (stack-gas) economizer low-temperature zone 9 is snake-like tube row, and material selection fluorine plastic tube absorbs fume afterheat by cigarette temperature drop It is low to 50 DEG C or so.Fluorine plastic tube has stronger decay resistance, and heating surface can be made to have for a long time in 50 DEG C of cigarette warm water are flat Effect operation.Primary and secondary air steam air heater body is snake-like tube row, selects " H " type extended surface tube, absorbs condensate heat and carries wind-warm syndrome Height is to 60 DEG C or so.
By the aperture for controlling Secondary Air steam air heater inlet regulating valve 18 and First air steam air heater inlet regulating valve 19, adjustment The water yield of steam air heater is flowed into, and then controls first and second steam air heater outlet wind-warm syndrome, using fume afterheat heating boiler primary and secondary air, Substitute conventional steam steam air heater.First and second wind-warm syndrome is improved, so that air preheater outlet cigarette temperature is improved, brings up to 160 DEG C of left sides The right side, lifts low low-level (stack-gas) economizer high temperature section cigarette temperature and utilizes level, increases low low-level (stack-gas) economizer high temperature section mechanical efficiency and effect of economizing on coal Benefit.
Low low-level (stack-gas) economizer high temperature section, low-temperature zone and primary and secondary air steam air heater are modular arrangement, and every group of module goes out, enters Mouth pipeline is equipped with valve, can individually close corresponding module, realizes independent start and stop, easy access.

Claims (5)

1. a kind of low low-level (stack-gas) economizer of coal unit combines air-supply heat penetration residual neat recovering system, it is characterised in that:In electrostatic Low low-level (stack-gas) economizer high temperature section is installed in front flue of dust collector(6), it is exported in desulfurizing tower gas approach in air-introduced machine and installs low Low-level (stack-gas) economizer low-temperature zone(9), First air steam air heater is set in an air channel(15), Secondary Air is set in secondary air duct and is warmed up Wind device(12), low low-level (stack-gas) economizer high temperature section(6)It is connected with condenser condensed water pipeline, low low-level (stack-gas) economizer low-temperature zone(9)It is logical Too low low-level (stack-gas) economizer low-temperature zone outlet conduit(11)Respectively with First air steam air heater(15)With Secondary Air steam air heater(12)It is in parallel Connection, First air steam air heater(15)With Secondary Air steam air heater(12)Outlet conduit and low low-level (stack-gas) economizer low-temperature zone(9)It is low Low-level (stack-gas) economizer low-temperature zone water return pipeline(20)Connection;The low low-level (stack-gas) economizer high temperature section(6)In the water inlet of low low-level (stack-gas) economizer Pipeline(5)Upper installation booster(4)With enter Water Check Valve(3), low low-level (stack-gas) economizer inlet channel(5)Gone out by low-pressure heater Mouth inlet valve(2)With low-pressure heater entrance inlet valve(1)The low-pressure heater of the series connection of connection two, low-pressure heater connection Condenser;Low low-level (stack-gas) economizer high temperature section(6)Low low-level (stack-gas) economizer water return pipeline(7)By low low-level (stack-gas) economizer water return pipeline Valve(8)Connection oxygen-eliminating device.
2. the low low-level (stack-gas) economizer of coal unit according to claim 1 combines air-supply heat penetration residual neat recovering system, its It is characterised by:The low low-level (stack-gas) economizer high temperature section(6)On be provided with low low-level (stack-gas) economizer high temperature section entrance header(6-1)With it is low Low-level (stack-gas) economizer high temperature section outlet header(6-2), low low-level (stack-gas) economizer low-temperature zone(9)On be provided with low low-level (stack-gas) economizer low-temperature zone Entrance header(9-1)With low low-level (stack-gas) economizer low-temperature zone outlet header(9-2).
3. the low low-level (stack-gas) economizer of coal unit according to claim 1 combines air-supply heat penetration residual neat recovering system, its It is characterised by:The First air steam air heater(15)On be provided with First air steam air heater entrance header(16)Go out with First air steam air heater Mouth header(17);Secondary Air steam air heater(12)On be provided with Secondary Air steam air heater entrance header(13)With the outlet of Secondary Air steam air heater Header(14).
4. the low low-level (stack-gas) economizer of coal unit according to claim 1 combines air-supply heat penetration residual neat recovering system, its It is characterised by:The First air steam air heater(15)Outlet pipe on be provided with First air steam air heater inlet regulating valve(19), it is secondary Wind steam air heater(12)Outlet pipe on be provided with Secondary Air steam air heater inlet regulating valve(18).
5. the low low-level (stack-gas) economizer of coal unit according to claim 1 combines air-supply heat penetration residual neat recovering system, its It is characterized as:The low low-level (stack-gas) economizer high temperature section(6), low low-level (stack-gas) economizer low-temperature zone(9), First air steam air heater(15)With it is secondary Wind steam air heater(12)Body be snake-like tube row, select " H " type extended surface tube.
CN201510302777.8A 2015-06-06 2015-06-06 Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit Active CN104930496B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510302777.8A CN104930496B (en) 2015-06-06 2015-06-06 Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510302777.8A CN104930496B (en) 2015-06-06 2015-06-06 Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit

Publications (2)

Publication Number Publication Date
CN104930496A CN104930496A (en) 2015-09-23
CN104930496B true CN104930496B (en) 2017-05-10

Family

ID=54117779

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510302777.8A Active CN104930496B (en) 2015-06-06 2015-06-06 Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit

Country Status (1)

Country Link
CN (1) CN104930496B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106051805B (en) * 2016-06-24 2018-12-14 福建龙净环保股份有限公司 A kind of residual neat recovering system and method using smoke discharging residual heat as steam air heater heat source
CN107023818A (en) * 2017-05-22 2017-08-08 山西中源科扬节能服务有限公司 Improved cooling coal economizer for power stations

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101900347B (en) * 2010-08-03 2012-01-04 山东泓奥电力科技有限公司 System for high-grade recycling waste heat of smoke discharged from boiler of power station
CN201779678U (en) * 2010-08-12 2011-03-30 山东泓奥电力科技有限公司 Device capable of recovering waste heat from boiler emissions for heating
CN204301104U (en) * 2014-12-10 2015-04-29 华电国际电力股份公司山东分公司 Cigarette temperature and smoke waste heat utilization system fall in boiler for deeply
CN204901731U (en) * 2015-06-06 2015-12-23 山东泓奥电力科技有限公司 Low low -level (stack -gas) economizer of coal -fired unit heating depth waste heat recovery system that jointly supplys air

Also Published As

Publication number Publication date
CN104930496A (en) 2015-09-23

Similar Documents

Publication Publication Date Title
WO2018014768A1 (en) Residual heat reuse system for turbine-boiler integrated heat energy circulation
CN204739568U (en) Energy saving and emission reduction system that horizontal phase transition heat exchanger and prefix type hydrophily formula GGH unite
CN101737766A (en) Coal-water boiler exhaust gas residual heat recovery device
CN105157010A (en) Coal-fired power generation system based on bypass flue at tail part of boiler
CN104964265A (en) Energy-saving emission reduction system and energy-saving emission reduction method of horizontal type phase change heat exchanger and front-arrangement type water medium type GGH combined
CN107687634A (en) The denitration of boiler full load couples fume afterheat gradient utilization system
CN104930496B (en) Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit
CN201606865U (en) Hydrophily type boiler smoke removal afterheat recycling device
CN105889897B (en) A kind of thermal power plant residual heat integrative recycling system and method
CN208332238U (en) A kind of piping-main scheme thickness gas waste heat source concentration residual neat recovering system
CN204853527U (en) Plenum heating waste heat recovery system is united to low low -level (stack -gas) economizer of coal -fired unit
CN206347555U (en) A kind of economic benefits and social benefits supplementary heat exchanger system for MGGH
CN207394813U (en) Low low-level (stack-gas) economizer Two-way Cycle heating system
CN204901731U (en) Low low -level (stack -gas) economizer of coal -fired unit heating depth waste heat recovery system that jointly supplys air
CN206846764U (en) A kind of coal-fired hot-water boiler fume afterheat depth recovery system
CN204301104U (en) Cigarette temperature and smoke waste heat utilization system fall in boiler for deeply
CN105757645B (en) A kind of coal-burning power plant's low grade residual heat resources effective utilization system
CN204665244U (en) A kind of association system of phase-change heat-exchanger band heat exchangers for district heating
CN107023819A (en) Low low-level (stack-gas) economizer Two-way Cycle heating system and Two-way Cycle heating means
CN111981465A (en) Flue gas waste heat utilization system
CN208920038U (en) A kind of thermal power plant's combined type Two-way Cycle fume afterheat effective utilization system
CN106123002A (en) A kind of flue gas MGGH system and method using condensation water heat exchange
CN206755129U (en) A kind of steam raising plant using residual heat from boiler fume
CN205783017U (en) A kind of smoke waste heat utilization system condensing the air-supply of water heating boiler
CN205782834U (en) A kind of residual heat from boiler fume utilizes combining heating system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant