CN201779684U - High-grade recycling system for exhaust heat of power station boiler - Google Patents

High-grade recycling system for exhaust heat of power station boiler Download PDF

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Publication number
CN201779684U
CN201779684U CN2010202793077U CN201020279307U CN201779684U CN 201779684 U CN201779684 U CN 201779684U CN 2010202793077 U CN2010202793077 U CN 2010202793077U CN 201020279307 U CN201020279307 U CN 201020279307U CN 201779684 U CN201779684 U CN 201779684U
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CN
China
Prior art keywords
flue gas
waste heat
air
heat exchanger
communicated
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.)
Expired - Lifetime
Application number
CN2010202793077U
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Chinese (zh)
Inventor
黄新源
马阳
刘金庭
姜培鹏
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
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Application filed by SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd filed Critical SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
Priority to CN2010202793077U priority Critical patent/CN201779684U/en
Application granted granted Critical
Publication of CN201779684U publication Critical patent/CN201779684U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The utility model belongs to the technical field of energy conservation, and particularly discloses a high-grade recycling system for exhaust heat of a power station boiler. A flue gas waste heat recycling secondary heat exchanger and a flue gas waste heat recycling primary heat exchanger are mounted sequentially along the flue gas flowing direction in a flue, an air preheat primary heat exchanger is mounted on a connection pipeline of an air blower and an air preheater, and the air preheat primary heat exchanger, the flue gas waste heat recycling primary heat exchanger and a primary circulation water pump form a closed water circulation loop. Temperature of flue gas at the outlet of the air preheater is increased by increasing inlet gas temperature of the air preheater so that higher flue gas waste heat recycling temperature can be obtained to heat up water, thereby realizing high-grade recycling of flue gas waste heat.

Description

Station boiler smoke discharging residual heat high-grade recycling system
(1) technical field
The utility model belongs to field of energy-saving technology, particularly a kind of station boiler waste heat high-grade recycling system.
(2) background technology
The best flue-gas temperature of station boiler sweetening process is at 80~90 ℃, but because a variety of causes, the station boiler exhaust gas temperature is at 120~150 ℃ at present, can't further reduce, so the station boiler smoke evacuation will seek out desulfurized effect preferably, flue gas will be lowered the temperature before advancing desulphurization system, promptly there is the higher energy loss of a large amount of grades in this mode, has also increased auxiliary power consumption.
Contain heat energy in the flue gas about how reclaiming, existing at present ripe flue gas waste heat recovery heat exchanger is just utilizing aspect the fume afterheat, unsatisfactory.About how utilizing after this part waste heat recovery in the boiler exhaust gas, a plurality of patents all have narration, but all be to be used to heat condenser condensed water after the boiler exhaust gas waste heat recovery or to be used for external heat supply, for example patent 200910014905.3 disclosed a kind of systems that utilize are used to the boiler exhaust gas waste heat to heat condenser condensed water exactly and are used for external heat supply.
Because the acting ability that low-pressure heater is bled is very low, fume afterheat replaces the part low-pressure heater and bleeds after the mode of heat-setting water enters thermodynamic system of steam tur, overwhelming majority energy will be lost in the environment in cold deep loss mode, and comprehensive utilization ratio is lower.For this mode of external heat supply, be subjected to the restriction of thermic load and heating parameter, be difficult to find appropriate thermal user and thermic load stable throughout the year, lasting.
(3) summary of the invention
The utility model provides a kind of fume afterheat that makes full use of in order to remedy the deficiencies in the prior art, the station boiler smoke discharging residual heat high-grade recycling system of energy-saving and emission-reduction.
The utility model is achieved by the following technical solution:
A kind of station boiler waste heat high-grade recycling system, comprise air preheater that is communicated with boiler flue gas outlet and the air-blaster that is communicated with air preheater, the exhanst gas outlet of air preheater is communicated with chimney by flue, it is characterized in that: by the flue gas trend flue gas waste heat recovery secondary heat exchange device and heat exchanger of flue gas waste heat recovery are installed successively on the described flue, heat exchanger of air preheat is installed, heat exchanger of air preheat on the connecting pipe of air-blaster and air preheater, heat exchanger of flue gas waste heat recovery and a water circulating pump are formed a sealing water circulation road.
The utility model plan as a whole in the whole boiler of thermal power plant, the turbine system thermal energy transfer, utilize process, flue-gas temperature is dropped to below 90 ℃, and the temperature of recovery waste heat is brought up to more than 150 ℃, it is used as the heat exchange energy.
The utility model waste heat recovery form has two kinds:
A kind of is that steam type reclaims, and the water inlet of flue gas waste heat recovery secondary heat exchange device is communicated with the drain port of high-pressure heater, and its steam (vapor) outlet is communicated with the import of bleeding of oxygen-eliminating device;
Another kind is that hot-water type reclaims, and the water inlet of fume afterheat secondary heat exchange device is communicated with the feed pump delivery port, and its delivery port is communicated with the high-pressure heater delivery port.
Above-mentioned dual mode is used to replace the part oxygen-eliminating device with the waste heat that reclaims bleeds, or replaces the part high-pressure heater and bleed, and comes heated feed water, even can suitably improve the air preheater air exit temp, further improves boiler efficiency.
The utility model provides the air preheater exit gas temperature by improving air preheater intake air temperature, thereby obtains higher flue gas waste heat recovery temperature, accomplishes the recycling of fume afterheat high-grade.
(4) description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
The system schematic that Fig. 1 reclaims for the utility model steam type;
The system schematic that Fig. 2 reclaims for the utility model hot-water type.
Among the figure, 1 air preheater, 2 air-blasters, 3 flues, 4 chimneys, 5 flue gas waste heat recovery secondary heat exchange devices, heat exchanger of 6 flue gas waste heat recoveries, heat exchanger of 7 air preheats, No. 8 water circulating pumps, 9 high-pressure heaters, 10 oxygen-eliminating devices, 11 feed pumps, 12 boilers.
(5) specific embodiment
Accompanying drawing is a kind of specific embodiment of the present utility model.This embodiment comprises air preheater 1 that is communicated with boiler 12 exhanst gas outlets and the air-blaster 2 that is communicated with air preheater 1, the exhanst gas outlet of air preheater 1 is communicated with chimney 4 by flue 3, by the flue gas trend flue gas waste heat recovery secondary heat exchange device 5 and heat exchanger 6 of flue gas waste heat recovery are installed successively on the described flue 3, on the connecting pipe of air-blaster 2 and air preheater 1 heat exchanger 7 of air preheat is installed, heat exchanger 7 of air preheat, heat exchanger 6 of flue gas waste heat recovery and 8 one-tenth one sealing of water circulating pump group water circulation road.
Heat exchanger 7 of air preheater, primary side water circulating pump 8, heat exchanger of flue gas waste heat recovery 6 are formed a sealing water circulation road.Heat exchanger 6 of flue gas waste heat recovery is reduced to flue-gas temperature below 90 ℃, and obtains the hot water of proper temperature, under the effect of side water circulating pump 8 successively, hot water is delivered to heat exchanger 7 of air preheat then, and heating enters the air before the air preheater 1.Raise the also corresponding lifting of the exhanst gas outlet temperature of air preheater 1 owing to enter the air themperature of air preheater 1.Flue gas waste heat recovery secondary heat exchange device 5 fume side temperature can improve greatly thus.
Flue gas waste heat recovery secondary heat exchange device 5 heating high-pressure heaters 9 are hydrophobic, and produce the above steam of 0.5MPa, supply with oxygen-eliminating device 10 and utilize, and replace part oxygen-eliminating device 10 and bleed, thereby obtain energy-saving effect.
In addition, but also heated feed water pump 11 exit portion feedwater of flue gas waste heat recovery secondary heat exchange device 5 returns the feedwater of temperature rise to the reasonable temperature to high-pressure heater 9 exits then.Reduce owing to enter the feedwater of high-pressure heater 9, high-pressure heater 9 is bled and also can correspondingly be reduced, thereby obtains energy-saving effect.

Claims (3)

1. station boiler waste heat high-grade recycling system, comprise air preheater (1) that is communicated with boiler (12) exhanst gas outlet and the air-blaster (2) that is communicated with air preheater (1), the exhanst gas outlet of air preheater (1) is communicated with chimney (4) by flue (3), it is characterized in that: described flue (3) is gone up by the flue gas trend flue gas waste heat recovery secondary heat exchange device (5) and a heat exchanger of flue gas waste heat recovery (6) is installed successively, a heat exchanger of air preheat (7) is installed, a heat exchanger of air preheat (7) on the connecting pipe of air-blaster (2) and air preheater (1), a heat exchanger of flue gas waste heat recovery (6) and a water circulating pump (8) are formed a sealing water circulation road.
2. station boiler waste heat high-grade recycling system according to claim 1, it is characterized in that: the water inlet of described flue gas waste heat recovery secondary heat exchange device (5) is communicated with the drain port of high-pressure heater (9), and its steam (vapor) outlet is communicated with the import of bleeding of oxygen-eliminating device (10).
3. station boiler waste heat high-grade recycling system according to claim 1, it is characterized in that: the water inlet of described fume afterheat secondary heat exchange device (5) is communicated with feed pump (11) delivery port, and its delivery port is communicated with high-pressure heater (9) delivery port.
CN2010202793077U 2010-08-03 2010-08-03 High-grade recycling system for exhaust heat of power station boiler Expired - Lifetime CN201779684U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010202793077U CN201779684U (en) 2010-08-03 2010-08-03 High-grade recycling system for exhaust heat of power station boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010202793077U CN201779684U (en) 2010-08-03 2010-08-03 High-grade recycling system for exhaust heat of power station boiler

Publications (1)

Publication Number Publication Date
CN201779684U true CN201779684U (en) 2011-03-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101900347A (en) * 2010-08-03 2010-12-01 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
CN102230615A (en) * 2011-06-20 2011-11-02 中国华能集团清洁能源技术研究院有限公司 Combined type flue gas residual heat comprehensive utilization system
CN102444901A (en) * 2011-11-30 2012-05-09 辽宁赛沃斯节能技术有限公司 Coal power plant combined type heat pipe flue gas waste heat recovery system and method
CN104235825A (en) * 2013-06-13 2014-12-24 烟台龙源电力技术股份有限公司 Boiler flue gas waste heat recycling system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101900347A (en) * 2010-08-03 2010-12-01 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
CN102230615A (en) * 2011-06-20 2011-11-02 中国华能集团清洁能源技术研究院有限公司 Combined type flue gas residual heat comprehensive utilization system
CN102230615B (en) * 2011-06-20 2013-02-13 中国华能集团清洁能源技术研究院有限公司 Combined type flue gas residual heat comprehensive utilization system
CN102444901A (en) * 2011-11-30 2012-05-09 辽宁赛沃斯节能技术有限公司 Coal power plant combined type heat pipe flue gas waste heat recovery system and method
CN104235825A (en) * 2013-06-13 2014-12-24 烟台龙源电力技术股份有限公司 Boiler flue gas waste heat recycling system

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C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20110330

Effective date of abandoning: 20120104