CN104456526A - Boiler flue gas waste heat recovery and recycle system - Google Patents

Boiler flue gas waste heat recovery and recycle system Download PDF

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Publication number
CN104456526A
CN104456526A CN201410685571.3A CN201410685571A CN104456526A CN 104456526 A CN104456526 A CN 104456526A CN 201410685571 A CN201410685571 A CN 201410685571A CN 104456526 A CN104456526 A CN 104456526A
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CN
China
Prior art keywords
heat exchanger
flue gas
water
waste heat
variable frequency
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Pending
Application number
CN201410685571.3A
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Chinese (zh)
Inventor
段百齐
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DIANNENG (BEIJING) ENERGY TECHNOLOGY Co Ltd
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DIANNENG (BEIJING) ENERGY TECHNOLOGY Co Ltd
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Priority to CN201410685571.3A priority Critical patent/CN104456526A/en
Publication of CN104456526A publication Critical patent/CN104456526A/en
Pending 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
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The invention discloses a boiler flue gas waste heat recovery and recycle system, and belongs to the technical field of boiler flue gas waste heat recovery and utilization. According to the structure of the boiler flue gas waste heat recovery and recycle system, a finned heat exchanger is connected with a flow meter, and the flow meter is connected with a variable frequency pump; pipe outlets of the finned heat exchanger are divided into two routes, wherein one route is connected with a tubular heat exchanger, and the other route is connected with the variable frequency pump through a water return bypass pipeline; outlets of the tubular heat exchanger are divided into two routes, wherein one route is connected with the variable frequency pump and the other route is a water return pipeline of a raw water system; an inlet of the tubular heat exchanger is connected with a water incoming pipeline of the raw water system. According to the waste heat utilization system, a flue gas waste heat recovery technology is adopted to recover waste heat of boiler flue gas, and therefore consumption of fire coal can be greatly reduced; the waste heat of the flue gas is used for heating condensate water so that the flue gas temperature can be effectively lowered, and therefore the efficiency of a boiler is greatly improved.

Description

A kind of recovery boiler fume afterheat reutilization system
Technical field
The invention belongs to residual heat from boiler fume recovery and utilization technology field, be specifically related to a kind of recovery boiler fume afterheat reutilization system.
Background technology
The aqueous vapor from power plant circulatory system is strict to water quality requirement, and the undesirable meeting of water quality causes power plant equipment cannot the operation of safety economy.According to the quality of raw water quality, power-plant makeup just must can enter water circulation system after the various ways process such as precipitation, filtration, desalination, and purified treatment technical process is: former water → clarification → ultrafiltration → counter-infiltration → desalination → main building.
Thermal power plant Yuan Shui water source mostly is surface water, former water water temperature affects larger by temperature, particularly in Winter-Spring two season, coolant-temperature gage is low reaches 0-5 DEG C, and reverse osmosis unit is as the important step of water treatment system, aquifer yield temperature influence is comparatively large, and temperature often declines 1 DEG C, and the reverse osmosis produced water yield can decline 3%-5%.In order to the flocculating result making reverse osmosis unit improve direct current cohesion in the winter time, design rating is met at hypothermic phase, guarantee device security, economical operation, improve the regeneration effect of the various interchanger of desalting system simultaneously, need to heat former water, improve reverse osmosis unit inflow temperature, water temperature controls at 20-30 DEG C.In North, Northeast China area Thermal Power Station, the service time of former water heater is 4-5 month.
The former water heater that thermal power plant uses is divided into two kinds, and one is indirect type heat exchange, adopts board-like, shell type surface formula heat exchanger, steam is not directly added to the water, and this heater fouling is serious, cleans because of difficulty, take up an area large, steam utilization is low, and application is less at present.Another kind is direct contact heat exchanger, is directly added to the water by steam, and this heat exchanger steam utilization very, heat exchanger volume is little, applies more.And the heating steam that these two kinds of heaters adopt is all the steam from main building Auxiliary Steam, when unit normally runs, the vapour source of main building Auxiliary Steam is four sections and draws gas.Former water and steam carry out heat exchange by heat exchanger, regulate former water bypass valve to adjust former water leaving water temperature.
Former water heater adopt the steam of main building Auxiliary Steam as adding hot vapour source, directly expend power plant thermal system steam, thus have influence on unit operation economy.And adopt more hybrid former water heater at present, because heating steam directly enters heater body water at low temperature, vehicle repair major is directly contacted, cause that water attack is serious, vibration is large, noise is large, even there is vapour and hit variety of problems, directly have influence on heater safe and stable operation.There is shortcomings in original former water heater.
In boiler various heat losses, the ratio that flue gas loss accounts for boiler Total heat loss is maximum.Show more obvious in high parameter boiler, the ratio that flue gas loss accounts for boiler Total heat loss accounts for 40 ~ 50%, even higher.Average annual 135 DEG C of boiler operatiopn exhaust gas temperature, after boiler carries out denitration transformation, the average exhaust gas temperature of boiler is also by rising 10-15 DEG C, has the larger energy saving space.
Summary of the invention
The object of the present invention is to provide a kind of recovery boiler fume afterheat reutilization system.
A kind of recovery boiler fume afterheat reutilization system, finned heat exchanger 1 is connected with flowmeter 2, flowmeter 2 is connected with variable frequency pump 3, the outlet spout of finned heat exchanger 1 is divided into two-way, a road and tubular heat exchanger 4, and backwater bypass duct 5 of leading up to is connected with variable frequency pump 3, the outlet of tubular heat exchanger 4 is divided into two-way, one tunnel is connected with variable frequency pump 3, and a road is former water system water return pipeline 6, and entrance and the former water system of tubular heat exchanger 4 carry out waterpipe 7 and be connected.
Described finned heat exchanger 1 heating surface is four flues, eight groups of heat exchanger body stagger arrangement counter-flow arrangement, two bodies on each flue are in arranging up and down, be positioned on the horizontal flue of each electrostatic precipitator outlet, flue gas is turned descending after flowing through heat exchanger, enter air-introduced machine.
Described each heat exchanger body is an independently loop, adopt the high frequency welding spiral fin tube of S-shaped tube panel, each independent loop heating surface adopts independent little header, and independent little header imports and exports design manually operated door, and every independent loop heating surface can control separately to put into operation or off-the-line.
Beneficial effect of the present invention: bootstrap system of the present invention adopts the waste heat of flue gas waste heat recovery technology recovery boiler flue gas, greatly can save coal-fired consumption, the energy consumption structure of enterprise is optimized, estimate to save mark about 0.5 ten thousand tons, coal year, improve efficiency, decrease the discharge of pollutant.Improve raw water heater heat form, adopt hot water and cold water mix to heat, avoid steam and the direct Hybrid Heating of water, elimination steady-state vibrations, noise, water attack, vapour hit phenomenon, improve heater safety operation level.The flue gas waste heat recovery technology that the present invention adopts, by utilizing fume afterheat heat-setting water, effectively can reduce exhaust gas temperature, thus substantially increase boiler efficiency.
Accompanying drawing explanation
Fig. 1 is bootstrap system structural representation of the present invention;
In figure, 1-finned heat exchanger, 2-flowmeter, 3-variable frequency pump, 4-tubular heat exchanger, 5-backwater bypass duct, the former water system water return pipeline of 6-, the former water system of 7-carrys out waterpipe.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment 1
A kind of recovery boiler fume afterheat reutilization system, as shown in Figure 1, finned heat exchanger 1 is connected with flowmeter 2, and flowmeter 2 is connected with variable frequency pump 3, and the outlet spout of finned heat exchanger 1 is divided into two-way, one tunnel and tubular heat exchanger 4, backwater bypass duct 5 of leading up to is connected with variable frequency pump 3, and the outlet of tubular heat exchanger 4 is divided into two-way, and a road is connected with variable frequency pump 3, one tunnel is former water system water return pipeline 6, and entrance and the former water system of tubular heat exchanger 4 carry out waterpipe 7 and be connected.
This System Utilization Procedure is: the former water of chemical water carrys out waterpipe 7 by former water system and enters tubular heat exchanger 4, the chemical water being produced heat by exchange heat flows out for subsequent use, the cool circulation water that tubular heat exchanger 4 produces is by variable frequency pump 3, flowmeter 2 enters finned heat exchanger 1, the flue gas heat that finned heat exchanger 1 will be collected, heating condensate water, becomes heat recirculated water, flow into tubular heat exchanger 4 to recycle, component loops water enters variable frequency pump 3 by backwater bypass duct 5 and recycles.
Described finned heat exchanger 1 heating surface is four flues, eight groups of heat exchanger body stagger arrangement counter-flow arrangement, two bodies on each flue are in arranging up and down, be positioned on the horizontal flue of each electrostatic precipitator outlet, flue gas is turned descending after flowing through heat exchanger, enter air-introduced machine.
Described each heat exchanger body is an independently loop, adopt the high frequency welding spiral fin tube of S-shaped tube panel, each independent loop heating surface adopts independent little header, and independent little header imports and exports design manually operated door, and every independent loop heating surface can control separately to put into operation or off-the-line.
Condensate water after heating can again through the former water of former water-to-water heat exchanger heating chemical water, and the steam originally adding the main building Auxiliary Steam of pyrogen water under substituting is bled, and produces amount of energy saving.
Condensate circulating pump selects two horizontal clarified water pump parallel runnings, adopts the control mode of frequency conversion one drag two.Residual neat recovering system seals between the former water heater import and export of former water heating system, and former water system water, after tubular heat exchanger heating, is got back in former water system.By regulating the motorized adjustment valve opening in parallel with heat recovery heat exchanger, by the cold water mix before the hot water after heating and heating, improve the temperature entering the condensate water of heat recovery heat exchanger, make it the acid dew point higher than flue gas, effectively can avoid the generation of cold end corrosion, extend the life-span of heat exchanger.
Flue gas waste heat recovery system adopts the control mode on the spot of PLC, and sends data to centralized control room, accomplishes long-range monitoring and on-line operation.

Claims (3)

1. a recovery boiler fume afterheat reutilization system, it is characterized in that, finned heat exchanger (1) is connected with flowmeter (2), flowmeter (2) is connected with variable frequency pump (3), the outlet spout of finned heat exchanger (1) is divided into two-way, one tunnel and tubular heat exchanger (4), backwater bypass duct (5) of leading up to is connected with variable frequency pump (3), the outlet of tubular heat exchanger (4) is divided into two-way, one tunnel is connected with variable frequency pump (3), one tunnel is former water system water return pipeline (6), entrance and the former water system of tubular heat exchanger (4) carry out waterpipe (7) and are connected.
2. a kind of recovery boiler fume afterheat reutilization system according to claim 1, it is characterized in that, described finned heat exchanger (1) heating surface is four flues, eight groups of heat exchanger body stagger arrangement counter-flow arrangement, two bodies on each flue are in arranging up and down, be positioned on the horizontal flue of each electrostatic precipitator outlet, flue gas is turned descending after flowing through heat exchanger, enter air-introduced machine.
3. a kind of recovery boiler fume afterheat reutilization system according to claim 2, it is characterized in that, described each heat exchanger body is an independently loop, adopt the high frequency welding spiral fin tube of S-shaped tube panel, each independent loop heating surface adopts independent little header, independent little header imports and exports design manually operated door, and every independent loop heating surface can control separately to put into operation or off-the-line.
CN201410685571.3A 2014-11-26 2014-11-26 Boiler flue gas waste heat recovery and recycle system Pending CN104456526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201410685571.3A CN104456526A (en) 2014-11-26 2014-11-26 Boiler flue gas waste heat recovery and recycle system

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105571381A (en) * 2016-02-01 2016-05-11 浙江天地环保工程有限公司 Control system and method for heat medium water pipe type heat exchanger
CN109059025A (en) * 2018-07-23 2018-12-21 浙江巨化热电有限公司 A kind of smoke comprehensive processing unit and its method

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Publication number Priority date Publication date Assignee Title
CN201233054Y (en) * 2008-06-17 2009-05-06 广东万家乐燃气具有限公司 Pre-warming and water supply system for multifunction wall hanging furnace
KR100949853B1 (en) * 2009-09-29 2010-03-31 주식회사 성지공조기술 System for recycling waste heat to prevent generation of white smoke
CN101871042A (en) * 2010-06-25 2010-10-27 中冶南方(武汉)威仕工业炉有限公司 Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit
CN102269401A (en) * 2010-06-07 2011-12-07 洛阳蓝海实业有限公司 Low-temperature flue gas waste heat recovery utilization method
CN103363517A (en) * 2013-08-01 2013-10-23 东方电气集团东方锅炉股份有限公司 Circulating fluidized bed boiler with high bed temperature and with steam parameter of 700 DEG C and above
CN203384963U (en) * 2013-05-29 2014-01-08 新疆蓝山屯河聚酯有限公司 Steam return water waste heat recovery device
CN203571707U (en) * 2013-09-28 2014-04-30 大唐双鸭山热电有限公司 Waste heat utilization device for deep cooling of waste flue gas of boiler
CN104006401A (en) * 2013-11-04 2014-08-27 成信绿集成股份有限公司 Power station boiler smoke waste heat deep recycling and emission reducing system
CN204268456U (en) * 2014-11-26 2015-04-15 电能(北京)节能技术有限公司 A kind of recovery boiler fume afterheat reutilization system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201233054Y (en) * 2008-06-17 2009-05-06 广东万家乐燃气具有限公司 Pre-warming and water supply system for multifunction wall hanging furnace
KR100949853B1 (en) * 2009-09-29 2010-03-31 주식회사 성지공조기술 System for recycling waste heat to prevent generation of white smoke
CN102269401A (en) * 2010-06-07 2011-12-07 洛阳蓝海实业有限公司 Low-temperature flue gas waste heat recovery utilization method
CN101871042A (en) * 2010-06-25 2010-10-27 中冶南方(武汉)威仕工业炉有限公司 Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit
CN203384963U (en) * 2013-05-29 2014-01-08 新疆蓝山屯河聚酯有限公司 Steam return water waste heat recovery device
CN103363517A (en) * 2013-08-01 2013-10-23 东方电气集团东方锅炉股份有限公司 Circulating fluidized bed boiler with high bed temperature and with steam parameter of 700 DEG C and above
CN203571707U (en) * 2013-09-28 2014-04-30 大唐双鸭山热电有限公司 Waste heat utilization device for deep cooling of waste flue gas of boiler
CN104006401A (en) * 2013-11-04 2014-08-27 成信绿集成股份有限公司 Power station boiler smoke waste heat deep recycling and emission reducing system
CN204268456U (en) * 2014-11-26 2015-04-15 电能(北京)节能技术有限公司 A kind of recovery boiler fume afterheat reutilization system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105571381A (en) * 2016-02-01 2016-05-11 浙江天地环保工程有限公司 Control system and method for heat medium water pipe type heat exchanger
CN105571381B (en) * 2016-02-01 2018-08-14 浙江天地环保科技有限公司 A kind of heat medium water pipe heat exchanger control system and method
CN109059025A (en) * 2018-07-23 2018-12-21 浙江巨化热电有限公司 A kind of smoke comprehensive processing unit and its method

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