WO2011020334A1 - System for recovering waste heat from flue gas - Google Patents

System for recovering waste heat from flue gas Download PDF

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Publication number
WO2011020334A1
WO2011020334A1 PCT/CN2010/071854 CN2010071854W WO2011020334A1 WO 2011020334 A1 WO2011020334 A1 WO 2011020334A1 CN 2010071854 W CN2010071854 W CN 2010071854W WO 2011020334 A1 WO2011020334 A1 WO 2011020334A1
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WO
WIPO (PCT)
Prior art keywords
phase change
flue gas
heating system
heat exchanger
low
Prior art date
Application number
PCT/CN2010/071854
Other languages
French (fr)
Chinese (zh)
Inventor
费广盛
王晓鹏
冯友福
李曙照
Original Assignee
深圳中兴科杨节能环保股份有限公司
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
Priority to CN200910109461.1 priority Critical
Priority to CN 200910109461 priority patent/CN101629713B/en
Application filed by 深圳中兴科杨节能环保股份有限公司 filed Critical 深圳中兴科杨节能环保股份有限公司
Publication of WO2011020334A1 publication Critical patent/WO2011020334A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, 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
    • F22D1/00Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F22D1/04Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways the tubes having plain outer surfaces, e.g. in vertical arrangement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, 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
    • F22D1/00Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F22D1/12Control devices, e.g. for regulating steam temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001Recuperative heat exchangers
    • F28D21/0012Recuperative heat exchangers the heat being recuperated from waste water or from condensates
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/50Systems profiting of external or internal conditions
    • Y02B30/56Heat recovery units
    • Y02B30/566Water to water
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage
    • Y02E20/36Heat recovery other than air pre-heating
    • Y02E20/363Heat recovery other than air pre-heating at fumes level

Abstract

A system for recovering waste heat from flue gas includes a phase change heat exchanger (100), which includes a phase change upper section (1) and a phase change lower section (9) communicated with the phase change upper section (1), and an autocontrol device (200) mounted on the phase change heat exchanger (100). The phase change upper section (1) is connected to a main condensate pipeline (2) in a low pressure regenerative heating system. The phase change lower section (9) is provided in a flue gas passageway. The flow of the condensate in the low pressure regenerative heating system to enter the phase change upper section (1) is controlled by the autocontrol device (200) according to a signal received from a wall temperature tester (6) which is installed on the phase change lower section (9). The condensate is heated after entering into the phase change upper section (1), and the heated condensate enters into the main condensate pipeline (2) once more. The system can save energy and efficiently heat condensate by utilizing waste heat from flue gas.

Description

 Flue gas waste heat recovery system

 The invention relates to a flue gas waste heat recovery system, in particular to a flue gas waste heat recovery system which utilizes waste heat of boiler tail flue gas to heat condensed water. Background technique

 It is well known that high-temperature flue gas discharged from the flue of the boiler tail is directly discharged into the atmosphere, which not only pollutes the environment, but also fails to meet the current requirements for boiler energy conservation. Therefore, how to effectively utilize the high-temperature flue gas discharged from the flue of the boiler tail to provide an energy-saving and environment-friendly boiler has become a concern of people in the field.

 At present, the waste heat of the boiler tail is widely used for heating air and water, such as heating cold air entering the boiler air preheater, or heating the condensate in other equipment or equipment. For condensate in a boiler regenerative heating system, it is usually heated by a low pressure heater. However, the use of low-pressure heaters requires the use of steam turbine extraction or exhaust to heat the condensate in the regenerative heating system, while extraction or exhaust requires a large amount of steam, which can result in wasted energy.

 In addition, while the high-temperature flue gas is cooled and its heat is effectively utilized, the low-temperature corrosion problem in the boiler equipment must also be considered.

 The dew condensation problem of the low temperature heating surface such as the air preheater at the rear of the boiler is the main factor causing the low temperature corrosion of the boiler equipment. Therefore, in order to solve the condensation problem of the tail heating surface, the wall surface temperature of the heating surface must be raised. The problem of low temperature corrosion of the heated surface in the boiler equipment is usually reduced by increasing the exhaust gas temperature or the inlet air temperature, but this will result in a certain energy waste.

 It can be seen that it is necessary to provide a new type of energy-saving system for utilizing boiler flue gas waste heat recovery, which can not only effectively utilize the flue gas waste heat of the boiler tail flue, but also effectively improve the energy waste caused by the steam pump work. . Summary of the invention

 The technical problem to be solved by the present invention is how to effectively utilize the waste heat of the flue gas at the tail of the boiler to partially replace the problem that the conventional low-pressure heater wastes energy due to the need for steam turbine steam extraction work.

Another technical problem to be solved by the present invention is that while effectively utilizing the high temperature flue gas at the tail of the boiler, Avoid boiler equipment being corroded at low temperatures.

 In order to solve the above technical problem, the present invention provides a flue gas waste heat recovery system, comprising a phase change heat exchanger, the phase change heat exchanger comprising a phase change upper section and a phase change lower section, and further comprising a phase change transformer The upper part of the heat exchanger phase change upper stage, the phase change upper section of the phase change heat exchanger is connected with the main condensate water pipeline in a low pressure regenerative heating system, and the phase change lower section of the phase change heat exchanger is set in one In the flue gas passage, a wall temperature tester is installed in the lower phase of the phase change, and the signal of the wall temperature tester passes through the self-control device to the condensed water flow in the low-pressure regenerative heating system of the upper phase of the phase change entering the phase change heat exchanger. Control is performed, the condensed water in the low-pressure regenerative heating system is heated after entering the upper phase of the phase change of the phase change heat, and the heated condensed water again enters the main condensate line in the low-pressure regenerative heating system.

 In the flue gas waste heat recovery system of the present invention, on the one hand, since the phase change upper section of the phase change heat exchanger is in communication with the main condensate water pipeline in the low pressure regenerative heating system, the lower phase of the phase change is in communication with the flue gas passage, so that utilization can be realized The residual heat of the flue gas is heated into the condensed water in the low-pressure regenerative heating system of the upper phase of the phase change heat phase change phase, that is, the phase change heat device does not need to extract steam as work to heat the condensed water in the low-pressure regenerative heating system, thereby saving not only Heat source, and effectively use the residual heat of flue gas.

 On the other hand, since the automatic control device can control the flow rate of the condensed water in the upper stage of the phase change of the phase change heat exchanger, it is ensured that the phase change of the phase change heat of the phase change heater is always higher than the smoke acid dew point, and the phase change is avoided. The heat exchanger is subject to low temperature corrosion. DRAWINGS

 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic plan view showing a preferred embodiment of a flue gas waste heat recovery system of the present invention. detailed description

 The structure of the flue gas waste heat recovery system of the present invention will be described below with reference to the accompanying drawings.

 Referring to FIG. 1 , the flue gas waste heat recovery system of the present invention mainly utilizes the condensed water in the low-pressure regenerative heating system of the flue gas waste heat of the boiler tail to avoid the waste of energy caused by the traditional low-pressure heater due to steam extraction work.

 The flue gas waste heat recovery system includes a phase change heat exchanger 100 and an automatic control device 200 installed in the phase change heat exchanger 100.

The phase change heater 100 employs a split structure including a phase change upper segment 1 and a phase change lower segment 9. The phase change lower section 9 communicates with the phase change upper section 1 through the vapor riser 30 and the liquid downcomer 40. The phase change lower section 9 is mounted on the tail flue gas passage of the boiler air preheater outlet. Upper phase change 1 is in communication with the main condensate line 2 in the regenerative heat heating system so that the condensed water in the regenerative heating system can enter the phase change upper section 1 for heat exchange therewith.

 The phase change lower section 9 includes a phase change section lower header box 8, a phase change section upper header box 5, and a plurality of heat exchange tubes 7 located in the phase change section lower header box 8 and the phase change section upper header box 5, each heat exchange tube The tube 7 is filled with a phase change working medium such as water. In the present embodiment, the heat exchange tube 7 employs a spiral finned tube structure. However, the structure of the heat exchange tube 7 is not limited thereto, and other structural forms may be employed as long as the phase change working medium in the heat exchange tube 7 and the flue gas outside the heat exchange tube 7 can be effectively exchanged.

 A wall temperature sensor 6 is mounted on the wall surface of the outermost heat exchange tube 7 of the phase change lower section 9 of the phase change heat exchanger 100, and the wall temperature sensor 6 transmits its temperature signal to the automatic control device 200. Signal input. The signal of the wall temperature sensor 6 can be adjusted by the automatic control device 200 to the flow rate of the condensed water entering the low-pressure regenerative heating system of the phase change upper stage 1, thereby adjusting the phase by flowing the flow of the condensed water flowing into the upper stage 1 of the phase change. The wall temperature of the lower section 9 is changed to achieve the purpose of controlling the wall temperature of the lower stage 9 of the phase change.

 The phase change upper section 1 of the phase change heat exchanger 100 employs a tubular heat exchanger structure, and the specific structure thereof is not limited by this embodiment.

 In the embodiment of the present invention, a water inlet line 50 and a water outlet line 52 are disposed between the phase change upper section 1 of the phase change heat exchanger 100 and the main condensate water line 2 of the low pressure heat recovery heating system. The water inlet line 50 and the water outlet line 52 are in communication with the main condensate line 2, respectively. The main condensate line 2 is hierarchically installed with a plurality of heaters 4 disposed on the main condensate line 2 after a certain stage heater 4 of the main condensate line 2 of the heater. The water outlet line 52 is installed on the main condensate line 2 after the heater 4 having a higher temperature in a certain stage. It can be understood that the water inlet pipe 50 can be partially connected to the condensed water to realize the auxiliary heater 4 to heat the condensed water, or all of the main condensed water, that is, the condensed water in the low-pressure regenerative heating system can be completely heated by the residual heat of the flue gas. There is no need for heater 4. At the same time, the inlet of the water inlet pipe 50 may be the outlet of the first stage heater 4, or the outlet of the second or third stage heater 4, that is, may be selected according to the needs of the power plant system, and the outlet pipe 52 is also required according to needs. Connected to the outlet of a certain level of heater 4, when the original exhaust temperature is high, the condensate of the phase change upper section 1 of the phase change heat exchanger 100 can be heated to a higher temperature as much as possible, so that the thermal efficiency will be higher. In the embodiment of the present invention, the condensed water after heating may be heated to a temperature of 140 degrees Celsius or more through the outlet water passing through the outlet pipe 52.

A condensed water flow regulating valve 3 is installed in the water inlet pipe 50 of the phase change upper section 1 of the phase change heat exchanger 100, that is, the condensed water flow rate entering the phase change upper section 1 can be controlled by the condensed water flow regulating valve 3. The control signal of the condensate flow regulating valve 3 is from the signal output end of the automatic control device 200. The working process of the flue gas waste heat recovery system of the present invention is as follows: First, the flue gas waste heat of the boiler tail flue enters the 100 phase transition lower section 9 of the phase change heat exchanger, and is fully performed with the heat exchange tube 7 in the phase change lower section 9. The heat exchange, phase change of the heat exchange tube 7 of the lower section 9 causes the phase change working medium in the heat exchange tube 7 to change from a liquid state to a vapor state due to absorption of waste heat of the flue gas. At this time, the residual heat of the flue gas is heated by the heat exchange tube 7 Exchange and cool down. The waste heat of the flue gas, which is obviously lowered in temperature, is connected to the precipitator via the phase change lower section 9; then, the vapor in the lower stage of the phase change enters the phase change upper section 1 of the phase change heat exchanger 100 along the vapor riser pipe 30; The condensed water in the low-pressure regenerative heating system enters the column of the phase change upper section 1 through the water inlet line 50 and exchanges heat with the steam outside the tube, and the condensed water is heated, and the steam becomes condensed water and acts along the liquid due to the heat release. The downcomer 40 is returned to the lower stage of the phase change, and the heated condensed water enters the main condensate line 2 through the water outlet line 52, thereby completing the purpose of heating the condensed water in the low pressure heat recovery heating system by utilizing the residual heat of the boiler flue gas.

 The whole heat exchange process of the phase change lower section 9 and the phase change upper section 1 of the phase change heat exchanger 100 is a phase change process in which the phase change working medium undergoes evaporation and condensation, and the phase change work medium undergoes a phase change state under a certain pressure. The temperature is constant. At this time, in the phase change state of the phase change lower section 9 and the phase change upper section 1 of the phase change heat exchanger 100, the heat transfer surface temperature of the heat exchange tube 7 is approximately equal to the phase transition temperature. Therefore, the phase change of the phase change lower section 9 of the phase change heat exchanger 100 is in an overall adjustable state.

 Since the phase change lower section 9 of the phase change heat exchanger 100 is equipped with the wall temperature sensor 6 , the wall temperature of the phase change lower section 9 can be adjusted by the automatic control device 200 to ensure that the wall temperature of the phase change lower section 9 is always higher than the flue gas. The acid dew point. That is to say, when the wall temperature of the phase change lower section 9 is lower than the acid dew point of the flue gas, the condensed water flow rate entering the phase change upper section 1 can be adjusted by the condensed water flow regulating valve 3 to realize the wall temperature of the lower phase change phase 9 Control, to ensure that it is always higher than the acid dew point of the flue gas, to avoid the phase change heat exchanger 100 from low temperature corrosion.

 Compared with the prior art, in the embodiment of the present invention, since the phase change heat exchanger 100 replaces the traditional low-pressure heater, the condensed water in the low-pressure regenerative heating system is heated by utilizing the residual heat of the flue gas at the tail of the boiler, that is, the phase change The heat exchanger 100 does not need to obtain a heat source by steam extraction or exhausting from a conventional low-pressure heater, which not only saves energy, but also effectively utilizes the residual heat of the flue gas at the tail of the boiler.

 It can be understood that the specific structure of the phase change heat exchanger 100 in the embodiment of the present invention is not limited by the embodiment, that is, as long as the condensed water in the low-pressure regenerative heating system is heated by utilizing the waste heat of the boiler flue gas. Hot swap devices or devices are available.

 The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request
A flue gas waste heat recovery system comprising a phase change heat exchanger, the phase change heat exchanger comprising a phase change upper section and a phase change lower section, characterized in that: further comprising a phase change heat exchanger The automatic control device, the phase change upper section of the phase change heat exchanger is connected with the main condensate water pipeline in a low-pressure regenerative heating system, and the phase change lower section of the phase change heat exchanger is disposed in a flue gas passage. The phase change lower section of the phase change heat exchanger is equipped with a wall temperature tester, and the signal of the wall temperature tester passes through the self-control device to the condensed water flow in the low-pressure regenerative heating system of the upper phase change phase of the phase change heat exchanger. Control is performed, the condensed water in the low-pressure regenerative heating system is heated after entering the upper phase of the phase change of the phase change heat, and the heated condensed water again enters the main condensate line in the low-pressure regenerative heating system.
 2. The flue gas waste heat recovery system according to claim 1, wherein: a phase change upper section of the phase change heat exchanger and a main condensate water pipeline in the low pressure regenerative heating system are connected to a water inlet pipeline, a condensed water flow regulating valve is installed on the inlet pipe, and the condensed water flow regulating valve is connected with the automatic control device, and the condensed water flow in the upper phase of the phase change entering the phase change heat is regulated by the automatic control device and the condensed water flow regulating valve .
 3. The flue gas waste heat recovery system according to claim 2, wherein: a phase change upper section of the phase change heat exchanger and a main condensate water line in the low pressure regenerative heating system are further connected to a water outlet pipeline. The condensed water in the low-pressure regenerative heating system is heated by the phase change upper section of the phase change heater, and is returned to the main condensate water pipe in the low-pressure regenerative heating system through the water outlet pipe.
 4. The flue gas waste heat recovery system according to claim 3, wherein: the main condensate water pipe in the low-pressure regenerative heating system is hierarchically provided with a plurality of heaters, and the water inlet pipes are installed in different stages of heating. After the device.
 The flue gas waste heat recovery system according to claim 4, wherein the outlet pipe is installed after a certain stage heater of the main condensate line in the low-pressure regenerative heating system.
 6. The flue gas waste heat recovery system according to claim 1, wherein: the phase change lower section of the phase change heatr comprises a phase change section lower header, a phase change section upper header, and a phase change section. The lower header and the plurality of heat exchange tubes of the junction box of the phase change section, the wall temperature tester is installed on the heat exchange tube.
 7. The flue gas waste heat recovery system according to claim 6, wherein: the wall temperature tester is in communication with the automatic control device, and the signal of the wall temperature tester passes through the phase of the phase change heat device through the automatic control device. The main condensate flow rate in the upper low pressure regenerative heating system is adjusted.
PCT/CN2010/071854 2009-08-19 2010-04-16 System for recovering waste heat from flue gas WO2011020334A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200910109461.1 2009-08-19
CN 200910109461 CN101629713B (en) 2009-08-19 2009-08-19 Flue gas afterheat recovery system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SG2012011847A SG178520A1 (en) 2009-08-19 2010-04-16 System for recovering waste heat from flue gas

Publications (1)

Publication Number Publication Date
WO2011020334A1 true WO2011020334A1 (en) 2011-02-24

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PCT/CN2010/071854 WO2011020334A1 (en) 2009-08-19 2010-04-16 System for recovering waste heat from flue gas

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CN (1) CN101629713B (en)
SG (1) SG178520A1 (en)
WO (1) WO2011020334A1 (en)

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CN101629713B (en) * 2009-08-19 2011-06-22 深圳中兴科扬节能环保股份有限公司 Flue gas afterheat recovery system
CN101907413B (en) * 2010-06-09 2012-04-04 张志宇 Horizontal type phase-change heat exchanger
CN101881436A (en) * 2010-08-11 2010-11-10 黑龙江省电力科学研究院 Separate low pressure coal economizer of elliptical fin heat pipe
CN101995028B (en) * 2010-11-02 2012-01-11 杨本洛 Energy and water saving desulphuration integrated system for power plant
CN102954460B (en) * 2011-08-18 2014-09-24 彭科 Power station boiler energy optimal utilization system
CN103307592A (en) * 2012-03-16 2013-09-18 尹华雷 Low-pressure coal economizer coated by walls of boiler tail flue
CN102705864B (en) * 2012-06-15 2014-09-17 黄绍新 Method and device for utilizing residual heat of smoke from boiler of fossil power plant
JP2015525863A (en) * 2012-07-06 2015-09-07 上海伏波▲環▼保▲設備▼有限公司 Co-current boiler flue gas residual heat recovery system
CN103114881B (en) * 2013-02-25 2015-11-18 山东岱荣热能环保设备有限公司 Multiple working medium backheating type Rankine cycle system
CN103925811A (en) * 2014-04-04 2014-07-16 江苏邦泰炉业有限公司 Industrial furnace air duct waste heat recovery system
CN105674238B (en) * 2016-03-30 2018-01-09 杭州华电能源工程有限公司 Wind-heat recover and the united energy-saving and emission-reduction system of fume afterheat depth retracting device and energy-saving and emission-reduction method

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CN101629713B (en) 2011-06-22
CN101629713A (en) 2010-01-20

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