CN106482088A - Joint thermal wind sensor utilizes system with the residual heat from boiler fume of steam air heater - Google Patents
Joint thermal wind sensor utilizes system with the residual heat from boiler fume of steam air heater Download PDFInfo
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- CN106482088A CN106482088A CN201610898023.8A CN201610898023A CN106482088A CN 106482088 A CN106482088 A CN 106482088A CN 201610898023 A CN201610898023 A CN 201610898023A CN 106482088 A CN106482088 A CN 106482088A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, 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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, 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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, 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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Air Supply (AREA)
Abstract
A kind of joint thermal wind sensor utilizes system with the residual heat from boiler fume of steam air heater, including：Boiler feedwater backheat heater, has low-pressure heating unit, hyperbaric heating unit, deoxygenation unit and the feed pump that order is connected；Residual-heat utilization, there is the air preheater being arranged on outside boiler and recirculating air duct, air preheater has air flow channel and flue gas flow channel, the entrance point of air flow channel is connected with warm air air channel and steam air heater, steam air heater is connected with the pressure fan of conveying environment cold wind, the port of export of air flow channel is connected with the hot air duct of boiler, and the import of recirculating air duct is connected with hot air duct and warm air air channel respectively with outlet.The power supplying efficiency making electricity generation system is greatly improved, reduce system investments and control difficulty with running, it is to avoid the burn into dust stratification of waste-heat recovery device and wear problem, overcome the cold end cold end corrosion of air preheater, need not newly-built by-pass flue, system flow is succinctly easier to engineering construction.
Description
Technical field
The invention belongs to Rear of Utility Boiler flue gas waste heat recovery and efficiency power generation technical field are and in particular to station boiler
Smoke discharging residual heat reclaims the electricity generation system for Steam Turbine heat regenerative system and the air-supply of steam turbine low-pressure pumping steam heat of condensation preboiler.
Background technology
Containing abundant residual heat resources in heat power plant boiler smoke evacuation.The exhaust gas temperature of coal-fired boiler is 125 DEG C
Left and right, the exhaust gas temperature of combustion boiler using brown coal is 150 DEG C about.Correspondingly, boiler exhaust gas heat waste fails to keep an appointment 5～8%, is station boiler
A maximum heat loss.In order to improve the fired power generating unit thermal efficiency further, meet the energy-saving and emission-reduction of power industry increasingly stringent
Require, boiler tail flue gas UTILIZATION OF VESIDUAL HEAT IN is in widespread attention.At present fume afterheat using basic ideas be, with Steam Turbine
In water supply heat back system, the relatively low condensate of temperature or feedwater make exhaust gas temperature be reduced to as cooling medium Mist heat recovering
About 90 DEG C, therefore save on the extracted steam from turbine in water supply heat back system, thus obtaining the raising of the thermal power generation unit thermal efficiency.
The smoke waste heat utilization system being widely used at present is the flue gas arranged downstream low temperature province in boiler air preheater
Coal device (also referred to as low-pressure coal saver) system, using unit condensate as cooling medium recovery boiler smoke discharging residual heat to cigarette temperature about 90
℃.The weak point of this system is：Due to the flue gas cool-down of low-level (stack-gas) economizer interval for exhaust gas temperature to 90 DEG C, so
Fume side cigarette warm water is put down relatively low, and the fume afterheat being reclaimed can only squeeze the relatively low steam turbine low-pressure of acting ability and draw gas, thus
The generating set energy-saving benefit being obtained by flue gas waste heat recovery is relatively low, and the benefit of saving coal of burning smoke coal power generation unit is about 0.5%；And
And, due to the heat transfer temperature difference between low-temperature flue gas and condensate relatively low so that the cost of low-level (stack-gas) economizer and volume are larger, reduce
The economy of this bootstrap system engineer applied.
In order to improve the heat to power output efficiency of boiler tail flue gas residual neat recovering system further, German scholar proposes one
Plant the bootstrap system based on air preheater by-pass flue.It is on the boiler tail setting side in parallel with air preheater
Smoke uptake, simultaneously in air preheater arranged downstream hydrophily regenerative air heater, using low-temperature zone flue gas heat release reheated blast, makes
Air preheater inlet distribution goes out part of smoke and passes through high-pressure economizer and low-pressure coal saver in by-pass flue and adds respectively
The feedwater of heat engine group and condensate, thus significantly improve put down by the cigarette warm water of water supply heat back system institute recovered flue gas heat energy, correspondingly
Improve fume afterheat and squeezed the quality drawn gas, so that the thermal efficiency of residual neat recovering system is significantly improved.Research shows identical
Flue gas waste heat recovery amount under, the energy-saving benefit of this system is about 2 times of low-level (stack-gas) economizer system.
Through com-parison and analysis, in published at present all kinds of boiler tail flue gas bootstrap systems, by-pass flue system
There is heat-economy and the Technical Economy of optimum.But, from the angle of engineer applied feasibility and system thermal efficiency, existing
By-pass flue system still suffers from following deficiency：
(1) distributed and the more difficult control of safe operation using the flue gas that air preheater by-pass flue makes heated surface at the end of boiler
System, system tends to complicated, and the investment of boiler back end ductwork also increases.Within the system, for controlling air preheater and low pressure to save
The cold end corrosion of coal device cold end heating surface, needs accurately and effectively to control the flue gas that air preheater and by-pass flue each export
Temperature, and exit gas temperature is with flue gas, and the distribution in this two parallel flow paths is directly related.The effective control cigarette with regard to how
Distribution between air preheater and by-pass flue for the gas, does not also have technological means and the operating experience of mature and reliable at present.For
Already for the huge thermal power generation system of system, set up by-pass flue so that system is more complicated, safe and reliable operation and from
The dynamic difficulty controlling increases.And, setting up by-pass flue need to redesign to boiler back end ductwork, so that the investment for trnasforming urban land of flue is increased
Greatly.
(2) heated surface corrosion, abrasion and dust stratification are made with unit feedwater or condensation water direct heat-exchange using ash-laden gas
Risk is larger, and system operation reliability reduces, and by-pass flue inner high voltage economizer is also larger with the investment of low-pressure coal saver.As
Operation difficult point encountered in low-level (stack-gas) economizer system practical application at present, low-temperature flue gas and cryogenic temperature condensation water direct heat-exchange
Economizer is faced with more prominent cold end corrosion and stifled ash problem, and this is the low temperature exhaust heat that sulfurous fuels burning produces flue gas
Using in effectively solving not yet so far application difficult point.For mitigating cold end corrosion, a part of low-level (stack-gas) economizer cold end heating surface needs
Using expensive corrosion-resistant material so that heating surface investment increases.Further, since the economizer in by-pass flue is arrangement
In the flue gas larger containing ash concentration, so heating surface wear is too fast can only to adopt relatively low flue gas flow rate, soot particle in addition in order to prevent
Pollute the reduction to heating surface diabatic process so that heating surface overall heat-transfer coefficient is relatively low, and, for preventing the serious dust stratification of heating surface
Can only be good but fin ratio less heat exchange cast, low heat transfer coefficient and low fin ratio make in by-pass flue using anti-dust stratification effect
The investment of economizer increases further, and system operation expense also increases therewith.
(3) using hydrophily regenerative air heater, system investments and operating cost are significantly increased, system flow is more multiple
Miscellaneous, the engineering feasibility of system and investment economy all reduce.So-called hydrophily regenerative air heater, is to be with closed cycle water
Between heat transfer medium, blown by low-temperature flue gas preboiler.Because low-temperature flue gas pass through intermediate medium indirect heat transfer, water with air
The equal very little of heat transfer temperature difference of the air side of matchmaker's regenerative air heater and fume side heating surface, leads to the throwing of hydrophily regenerative air heater
Money and operating cost are very big, cause significant adverse effect to the Technical Economy of system.And, hydrophily regenerative air heater
Fume side heating surface occurs serious cold end corrosion also higher with the risk of stifled ash so that affecting the risk of system safe and reliable operation
Point increases.Additionally, the safe and reliable operation of boiler main air preheater is directly related with hydrophily regenerative air heater, and hydrophily formula
Air preheater be a heat-exchange system being collectively formed by fume side, air side heating surface and enclosed water-flow circuit so that
Bootstrap system is overall excessively complicated, and operational factor is difficult to adjust control.
(4) although conventional by-pass flue system improves quality and the efficiency of boiler tail flue gas waste heat recovery, on side
The heat being recycled to unit heat regenerative system in smoke uptake is still cooled to putting of about 90 DEG C of cigarette temperature for boiler exhaust gas by former exhaust gas temperature
Heat, thus the flue gas heat reclaiming in boiler tail does not increase, this makes carrying further of this system gained benefit of saving coal
Height is restricted.
Content of the invention
The present invention is to carry out to solve the above problems it is therefore intended that providing a kind of circulating air using cleaning to make
Feed water and condensate for heat transfer medium heating unit, and make full use of the heat of condensation preheating environment cold wind that steam turbine low-pressure draws gas
Efficient power generation system, both ensure that temperature level and the heat to power output of the recycled fume afterheat of higher water supply heat back system
Efficiency, further increases the fume afterheat amount of recovery it is achieved that being greatly improved of the power supplying efficiency of electricity generation system simultaneously, reduces
Residual neat recovering system investment controls difficulty with running, it is to avoid the burn into dust stratification of waste-heat recovery device and wear problem, overcomes
The cold end cold end corrosion of air preheater, and need not newly-built by-pass flue, system flow succinct it is easier to engineering construction.
A kind of joint thermal wind sensor utilizes system, for entering to fuel in the boiler with the residual heat from boiler fume of steam air heater
Row is burnt and is connected it is characterised in that including with the Steam Turbine containing the steam turbine being driven with steam acting：
Boiler feedwater backheat heater, has the low-pressure heating unit being sequentially connected, hyperbaric heating unit, deoxygenation list
Unit and feed pump；With
Residual-heat utilization,
Wherein, as heat exchange thermal source, high pressure adds the low-pressure pumping steam after the steam acting that low-pressure heating unit is produced using boiler
Hot cell using steam acting after high pressure extraction as heat exchange thermal source,
Residual-heat utilization has the air preheater being arranged on outside boiler and recirculating air duct, air
Preheater has air flow channel and flue gas flow channel, recirculating air duct have order be connected high pressure heat exchanger, low pressure heat exchanger,
Recirculation blower,
The entrance point of flue gas flow channel is connected with the back-end ductwork of boiler, and the middle temperature flue gas that boiler is discharged enters from back-end ductwork
After entering flue gas flow channel, the outlet through flue gas flow channel is discharged,
The entrance point of air flow channel is also associated with warm air air channel and steam air heater, steam air heater and the cold wind wind being provided with pressure fan
Road is connected, and the port of export of air flow channel is connected with the hot air duct of boiler, and environment cold wind is by pressure fan via cold wind air channel
Send into steam air heater, being condensed water preheating in steam air heater becomes warm air, and the warm air of steam air heater outlet is said with from reduced air
The circulated air of mouth flows into air flow channel after mixing in warm air air channel, and carries out after heat exchange with the middle temperature flue gas of flue gas flow channel
It is heated as hot blast, a part for this hot blast enters boiler by hot air duct,
The entrance point of recirculating air duct is connected with hot air duct, and the port of export is connected with warm air air channel, in hot air duct
Another part of hot blast sequentially pass through high pressure heat exchanger, low pressure heat exchanger and reduced air from the entrance point of recirculating air duct
After machine, the outlet through recirculating air duct flows into warm air air channel,
The steam that boiler produces obtains condensate through condensation after steam turbine acting, and condensate is through backheat heating unit
Heated formation feedwater enters boiler, and each heater is sequentially drawn gas to condensate using what the pressure in steam turbine was incremented by respectively
Heating obtains high-temperature water, and condensate enters low-pressure heating unit heat exchange and obtains low-pressure heating water, low pressure heat exchanger and at least one
Low-pressure heater is in parallel for partial coagulation water is thermally formed low pressure heat-exchanging water,
In low-pressure heating unit, part low-pressure heating water is incorporated in steam air heater by the inlet channel of steam air heater and send to being derived from
The environment cold wind of fan outlet is preheated, and then flows out the steam producing with boiler through steamer from the outlet conduit of steam air heater
Condensate mixing is obtained through condensation after machine acting,
Low-pressure heating water is entered deoxygenation unit after being mixed with low pressure heat-exchanging water and is obtained deaerated water by deoxygenation,
Deaerated water, after feed pump boosting, is partly into hyperbaric heating unit heat exchange and obtains hyperbaric heating water, another portion
Point entering high pressure heat exchanger is obtained high pressure heat exchange water after Hot-blast Heating, hyperbaric heating water mix with high pressure heat exchange water after as pot
Stove feedwater supply boiler heating.
The joint thermal wind sensor that the present invention provides utilizes system with the residual heat from boiler fume of steam air heater, can also have this
The feature of sample it is characterised in that：Wherein, low-pressure heating unit, hyperbaric heating unit all include at least one extraction heater.
The joint thermal wind sensor that the present invention provides utilizes system with the residual heat from boiler fume of steam air heater, can also have this
The feature of sample it is characterised in that：Wherein, low-pressure heating unit has the condensate obtaining condensate after steam acting through condensation
The port of export of pipeline is sequentially connected in series four extraction heaters of setting to deoxygenation unit water inlet end.
The joint thermal wind sensor that the present invention provides utilizes system with the residual heat from boiler fume of steam air heater, can also have this
The feature of sample it is characterised in that：Wherein, hyperbaric heating unit has and is sequentially connected in series to boiler feedwater end from the water side of feed pump
Three extraction heaters of setting.
The joint thermal wind sensor that the present invention provides utilizes system with the residual heat from boiler fume of steam air heater, can also have this
The feature of sample it is characterised in that：Wherein, recirculating air duct is provided with hot blast regulating valve, and this hot blast regulating valve is used for adjusting to be sent into
The hot blast rate of boiler and the scale of recirculation hot blast rate.
The joint thermal wind sensor that the present invention provides utilizes system with the residual heat from boiler fume of steam air heater, can also have this
The feature of sample it is characterised in that：Wherein, deoxygenation unit is oxygen-eliminating device.
The joint thermal wind sensor that the present invention provides utilizes system with the residual heat from boiler fume of steam air heater, can also have this
The feature of sample it is characterised in that：Wherein, air preheater both can be rotary regenerative air preheater or tubular air
Preheater.
The joint thermal wind sensor that the present invention provides utilizes system with the residual heat from boiler fume of steam air heater, can also have this
The feature of sample it is characterised in that：Wherein, high pressure heat exchanger is high-pressure economizer, and low pressure heat exchanger is low-pressure coal saver.
The present invention also provides a kind of residual heat from boiler fume comprising joint thermal wind sensor and steam air heater to utilize the height of system
Effect electricity generation system is it is characterised in that also include：Steam Turbine, allows the steam that boiler produces to enter and to do work, has output shaft；
Generating set, is connected with the output shaft of Steam Turbine, for generating electricity, wherein, jointly thermal wind sensor and warm braw of the present invention
The residual heat from boiler fume of device utilizes a kind of therrmodynamic system that system is between boiler controller system and Steam Turbine to couple.
Invention effect and effect
Compared with prior art, the invention has the beneficial effects as follows：
(1) still ensure that Turbo-generator Set connect with the by-pass flue system of prior art using the quality of fume afterheat
Closely so that generating efficiency greatly improves.This is because pass through thermal wind sensor, increase air preheater preheated air amount so that
To be heated the heat needed for air increases by boiler tail flue gas, and flue-gas temperature reduces, and the fume afterheat of recovery transfers to hot blast
In, the hot blast temperature after heating is close with bypass flue inlet temperature, only 20 DEG C about of the temperature difference, and both qualities are close.With
When under ensureing boiler air-supply volume and wind pushing temperature permanence condition, the hot blast having more is carried out recirculation, the cycling hot of high-quality
Wind heating unit feedwater and condensate, thus reduce the amount of drawing gas of high-pressure heater and low-pressure heater, save the return vapour that draws gas
Turbine continues expansion work, and last result is so that the power supplying efficiency of thermal power generation system is greatly improved.
(2) avoid waste-heat recovery device that burn into dust stratification and wear problem occur, and reduce waste-heat recovery device heat exchange
Face is invested.This is because using the circulating air cleaning as thermal source, on the one hand, avoid the burn into mill of waste-heat recovery device
Damage and dust stratification problem；On the other hand, because there is not dust stratification, wear problem it is also possible to the flow velocity improving hot blast in heat exchanger to carry
The high coefficient of heat transfer is thus reduce heat exchanger investment, but also the heat exchange cast of high fin ratio can be adopted to change thus reducing further
The volume of hot device, investment and operating cost.
(3) avoid by-pass flue transformation, do not increase automatic control system difficulty.Due to using air as intermediate heat
Medium, flue gas heat is recycled indirectly, therefore only need to increase the original heat-transfer surface of air preheater it is not necessary to be bypassed
Flue duct retrofit is it is not required that the exhaust gas volumn setting up complexity is adjusted and control system.
(4) hydrophily regenerative air heater be instead of by steam air heater, further increase the power supplying efficiency of electricity generation system, and
Avoid the cold end cold end corrosion of air preheater, also reduce investment and the operation difficulty of residual neat recovering system simultaneously.This
Bright middle air preheater exiting flue gas are directly reduced to lower temperature levels, and fume afterheat has maximized recovery, on the one hand, permissible
Cancel the hydrophily regenerative air heater that cost is high, operation is complicated, simplify the heat transfer process of tail flue gas；On the other hand, warm braw
Device adopts condensate as preheating cold wind thermal source, it is to avoid heat brought corrosion and stifled ash problem by low-temperature flue gas, simultaneously
Air preheater entering air temperature can be adjusted by steam air heater, thus controlling air preheater cold-end air wall temperature of heated surface avoiding
The safety range of serious cold end corrosion, realizes guaranteeing air preheater safe and reliable operation while Mist heat recovering；And
And, because steam air heater provides a part of boiler air-supply preheating institute's calorific requirement so that distributing to the fume afterheat of recirculating air duct
Yield increases, thus the power supplying efficiency of electricity generation system improves further.Further, since steam air heater is taken out using from heater outlet
The condensate taking as thermal source, therefore is more prone to implement than the routine steam air heater that draws gas, has the advantages that simple and feasible.
Brief description
Fig. 1 is the system composition schematic diagram of the present invention.
1：Back-end ductwork；2：Flue gas flow channel；3：Air flow channel；4：Hot air duct；5：Recirculating air duct；6：Condensate pipe
Road；7：Enter boiler feedwater pipeline；8：Air preheater；9：Cleaner unit；10：Air-introduced machine；11：High-pressure economizer；12：Low pressure saves
Coal device；13：Circulating fan；14：Steam air heater；15：Pressure fan；16：Feed pump；17：Hot blast regulating valve；18-19：Regulating valve；21：
Bypass feedwater inlet channel；22：Bypass feedwater outlet conduit；23：Bypass condensate inlet channel；24：Bypass condensate water outlet
Pipeline；25：Steam air heater inlet channel；26：Steam air heater outlet conduit；#1～#8：Extraction heater；30：Warm air air channel；31：Cold
Wind air channel.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, real below
Apply example and combine accompanying drawing to the structure of the present invention, principle, be specifically addressed using step, technique effect.
Embodiment
Fig. 1 is the system composition schematic diagram of the present invention.
As shown in figure 1, electricity generation system 100 have comprise produce steam the boiler controller system of boiler and comprise steam turbine and
The Turbo-generator Set of electromotor.
The output shaft rotation of steam turbine acting driving steam turbine, output is entered after the steam of boiler controller system generation High Temperature High Pressure
The electromotor high-speed rotation that axle band is dynamically connected generates electricity.
As shown in figure 1, boiler controller system be used in the boiler fuel is burnt and with containing with steam acting drive
The Turbo-generator Set of steam turbine is connected, including boiler feedwater backheat heater and boiler tail flue gas UTILIZATION OF VESIDUAL HEAT IN dress
Put.
Boiler feedwater backheat heater, has be arranged in series four extraction heater (#5～#8 that order is connected
Extraction heater) the low-pressure heating unit forming, there is setting in sequential series three extraction heaters composition hyperbaric heating
Unit (#1～#3 extraction heater), deoxygenation unit (#4 extraction heater also takes on the function of oxygen-eliminating device) and feed pump 16.
Wherein, as heat exchange thermal source, high pressure adds the low-pressure pumping steam after the steam acting that low-pressure heating unit is produced using boiler
Hot cell is using the high pressure extraction after steam acting as heat exchange thermal source.
Residual-heat utilization has the air preheater 8 being arranged on outside boiler and recirculating air duct 5, empty
Air preheater 8 has air flow channel 3 and flue gas flow channel 2, and recirculating air duct 8 has the high-pressure economizer 11, low that order is connected
Pressure economizer 12 and recirculation blower 13.
The entrance point of flue gas flow channel 2 is connected with the back-end ductwork 1 of boiler, and the middle temperature flue gas that boiler is discharged is from back-end ductwork
After 1 entrance flue gas flow channel 2, the outlet through flue gas flow channel is discharged.
The entrance point of air flow channel 3 is also associated with warm air air channel 30 and steam air heater 14, steam air heater 14 be provided with pressure fan
15 cold wind air channel 31 is connected, and the port of export of air flow channel 3 is connected with the hot air duct of boiler, and environment cold wind is by pressure fan
15 send into steam air heater 14 via cold wind air channel, and being condensed water preheating in steam air heater 14 becomes warm air, the warm air of steam air heater outlet
With mix in warm air air channel 30 from the circulated air that recirculating air duct 5 exports after flow into air flow channel 3, and with flue gas flow channel 2
Middle temperature flue gas carry out becoming hot blast after heat exchange is heated, the part of this hot blast enters boiler by hot air duct 4.
The entrance point of recirculating air duct 5 is connected by hot blast regulating valve 17 with hot air duct 4, the port of export and warm air air channel
30 are connected, and another part of the hot blast in hot air duct 4 sequentially passes through high-pressure economizer from the entrance point of recirculating air duct 5
11st, flow into warm air air channel 30 after low-pressure coal saver 12 and recirculation blower 13 after the port of export of recirculating air duct 5, and warm
Air inlet preheater 8 together after the warm air mixing of wind device 14 outlet.
The steam that boiler produces obtains condensate through condensation after steam turbine acting, and condensate is through backheat heating unit
Heated formation feedwater enters boiler, and each heater is sequentially drawn gas to condensate using what the pressure in steam turbine was incremented by respectively
Heating obtains high-temperature water, and condensate enters low-pressure heating unit heat exchange and obtains low-pressure heating water, low pressure heat exchanger and at least one
Low-pressure heater is in parallel for condensate is thermally formed low pressure heat-exchanging water.
In low-pressure heating unit, part low-pressure heating water is incorporated in steam air heater by the inlet channel of steam air heater and send to being derived from
The environment cold wind of fan outlet is preheated, and then flows out the steam producing with boiler through steamer from the outlet conduit of steam air heater
Condensate mixing is obtained through condensation after machine acting.
Low-pressure heating water is entered deoxygenation unit after being mixed with low pressure heat-exchanging water and is obtained deaerated water by deoxygenation.
Deaerated water, after feed pump 16 boosting, is partly into hyperbaric heating unit heat exchange and obtains hyperbaric heating water, another
Be partially into high pressure heat exchanger and obtained high pressure heat exchange water after Hot-blast Heating, hyperbaric heating water mix with high pressure heat exchange water after conduct
Boiler feedwater supply boiler heating.
Running and principle
Fuel and hot blast enter boiler furnace and carry out combustion heat release generation high-temperature flue gas, and high-temperature flue gas pass through soda pop heating surface
Heating enters the feedwater of boiler, and feedwater heat absorption vaporization is changed into steam, and steam enters turbine expansion and does work thus driving electromotor
Generate electricity.The steam finishing work(from steam turbine enters condenser condensation, after the condensate of condenser outlet is boosted by condensate pump
Sequentially pass through low-pressure pumping steam heater (#5～#8 extraction heater) and oxygen-eliminating device (#4 extraction heater) heating, oxygen-eliminating device exports
Water boost again through feed pump 15 after by high pressure extraction heater (#1～#3 extraction heater) heat after enter boiler (this
Figure does not provide the parts such as condenser, condensate pump, and these parts are electricity generation system conventional components).Boiler furnace fuel fires
Burn after the high-temperature flue gas producing cool down through multigroup soda pop heating surface and enter back-end ductwork 1.
Economizer exit flue gas through back-end ductwork 1 air inlet preheater 8, to air (this air in air preheater 8
The environment cold wind being extracted by pressure fan and the circulated air in recirculating air duct 5 form) heated, the hot blast part after heating
Boiler is entered by hot air duct 4 and meets burning and the air quantity needed for pulverizing process；Circulated air enters recirculating air duct 5, again
Setting high-pressure economizer 11 and low-pressure coal saver 12 in circulation air path 5, high-pressure economizer 11 introducing portion high-pressure feed water enters and changes
Hot device, carries out cooling heat absorption to hot blast, and the feedwater after heating is re-introduced into feedwater piping 7 and enters boiler, and low-pressure coal saver 12 introduces
Part low pressure condensate water enters heat exchanger, is cooled down heat absorption further to the circulated air after high-pressure economizer 11, after heating
Condensate be re-introduced into condensing water conduit 6, the circulated air of low-pressure coal saver 12 outlet is pressurized, after supercharging by recirculation blower 13
The warm air that exports with steam air heater 14 of circulated air mixed in warm air air channel 30, mixed air enters via warm air air channel 30
Enter air preheater 8 to be heated.The flue gas that air preheater 8 is discharged introduces desulfurizer after cleaner unit 9 dedusting and purifies
Process and enter again in environment.Environment cold wind is sent in steam air heater 14 by pressure fan 15 via cold wind air channel 31, by from steam turbine
The condensate preheating of heat regenerative system sends into warm air air channel 30 after becoming warm air.
The environment that pressure fan 15 is extracted by steam air heater 14 using steam turbine low-temperature condensate (#7 low-pressure heater goes out saliva)
Cold wind preheating becomes warm air, and warm air passes through warm air air channel 30 air inlet preheater 8 after mixing with the circulated air after supercharging, and and
Middle temperature flue gas heat exchange in flue gas flow channel 2 and intensification of absorbing heat further, two air heating processes ensure that and enter boiler
Air themperature.Because air preheater 8 entrance pathogenic wind-warm raises, for reducing the exit gas temperature of flue gas flow channel 2 as far as possible to the greatest extent may be used
Mist heat recovering more than energy, therefore increase the amount inlet air of air preheater 8, so that part hot blast can circulate carries out heat
Amount reclaims.
The effect of embodiment and beneficial effect
According to the present embodiment provide there is the boiler controller system of steam air heater and electricity generation system beneficial effect is：
(1) still ensure that Turbo-generator Set connect with the by-pass flue system of prior art using the quality of fume afterheat
Closely so that generating efficiency greatly improves.This is because pass through thermal wind sensor, increase air capacity in air preheater so that
To be heated the heat needed for air increases by boiler tail flue gas, and flue-gas temperature reduces, and the fume afterheat of recovery transfers to hot blast
In, the hot blast temperature after heating is close with bypass flue inlet temperature, only 20 DEG C about of the temperature difference, and both qualities are close.With
When under ensureing boiler air-supply volume and wind pushing temperature permanence condition, the hot blast having more is carried out recirculation, so can produce height
The circulating air of quality is used for heating unit feedwater and condensate, thus reduces drawing gas of high-pressure heater and low-pressure heater
Amount, saves return steam turbine of drawing gas and continues expansion work, last result is so that the power supplying efficiency of thermal power generation system is able to
It is greatly improved.
(2) avoid waste-heat recovery device that burn into dust stratification and wear problem occur, and reduce waste-heat recovery device heat exchange
Face is invested.This is because using the circulating air cleaning as thermal source, on the one hand, avoid the burn into mill of residual heat using device
Damage and dust stratification problem；On the other hand, because there is not dust stratification, wear problem, be conducive to improving the flow velocity of hot blast in heat exchanger to carry
The high coefficient of heat transfer is thus reduce heat exchanger investment, but also the heat exchange cast of high fin ratio can be adopted to change thus reducing further
The volume of hot device, investment and operating cost.
(3) avoid by-pass flue transformation, do not increase automatic control system difficulty.Due to using air as intermediate heat
Medium, flue gas heat is recycled indirectly, therefore only need to increase the original heat-transfer surface of air preheater it is not necessary to be bypassed
Flue duct retrofit is it is not required that the exhaust gas volumn setting up complexity is adjusted and control system.
(4) hydrophily regenerative air heater be instead of by steam air heater, further increase the power supplying efficiency of electricity generation system, and
Avoid the cold end cold end corrosion of air preheater, also reduce investment and the operation difficulty of residual neat recovering system simultaneously.This
Bright middle air preheater exiting flue gas are directly reduced to lower temperature levels, and fume afterheat has maximized recovery, on the one hand, permissible
Cancel the hydrophily regenerative air heater that cost is high, operation is complicated, simplify the heat transfer process of tail flue gas；On the other hand, warm braw
Device adopts condensate as preheating cold wind thermal source, it is to avoid heat brought corrosion and stifled ash problem by low-temperature flue gas, simultaneously
Air preheater entering air temperature can be adjusted by steam air heater, thus controlling air preheater cold-end air wall temperature of heated surface avoiding
The safety range of serious cold end corrosion, realizes guaranteeing air preheater safe and reliable operation while Mist heat recovering；And
And, because steam air heater provides a part of boiler air-supply preheating institute's calorific requirement so that distributing to the fume afterheat of recirculating air duct
Yield increases, thus the power supplying efficiency of electricity generation system improves further.Further, since steam air heater is taken out using from heater outlet
The condensate taking as thermal source, therefore is more prone to implement than the routine steam air heater that draws gas, has the advantages that simple and feasible.
Claims (9)
1. a kind of joint thermal wind sensor and the residual heat from boiler fume of steam air heater utilize system, for carrying out to raw coal in the boiler
Burn and be connected it is characterised in that including with the Steam Turbine containing the steam turbine being driven with steam acting：
Boiler feedwater backheat heater, have order be connected low-pressure heating unit, hyperbaric heating unit, deoxygenation unit and
Feed pump；With
Residual-heat utilization,
Wherein, the low-pressure pumping steam after the steam acting that described low-pressure heating unit is produced using boiler is as heat exchange thermal source, described height
Press heating unit using the high pressure extraction after steam acting as heat exchange thermal source,
Described residual-heat utilization has the air preheater being arranged on outside boiler and recirculating air duct, described
Air preheater has air flow channel and flue gas flow channel, and described recirculating air duct has the high pressure heat exchanger, low that order is connected
Pressure heat exchanger, recirculation blower, the entrance point of described flue gas flow channel is connected with the back-end ductwork of boiler, the middle temperature that boiler is discharged
Flue gas outlet through this flue gas flow channel after back-end ductwork enters described flue gas flow channel is discharged,
The entrance point of described air flow channel is also associated with warm air air channel and steam air heater, this steam air heater and the cold wind being provided with pressure fan
Air channel is connected, and the port of export of described air flow channel is connected with the hot air duct of boiler, and environment cold wind is by described pressure fan warp
Described steam air heater is sent into by cold wind air channel, being condensed water preheating in this steam air heater becomes warm air, the temperature of described steam air heater outlet
Wind with mix in described warm air air channel from the circulated air that described recirculating air duct exports after flow into described air flow channel, and with
The middle temperature flue gas of described flue gas flow channel is heated as hot blast after carrying out heat exchange, and a part for this hot blast passes through hot air duct
Enter boiler,
The entrance point of described recirculating air duct is connected with hot air duct, and the port of export is connected with described warm air air channel, hot blast wind
Another part of hot blast in road sequentially passes through described high pressure heat exchanger from the entrance point of described recirculating air duct, described low pressure is changed
After hot device and described recirculation blower, the outlet through described recirculating air duct flows into described warm air air channel,
The steam that boiler produces obtains condensate through condensation after steam turbine acting, and condensate is added through backheat heating unit
Thermosetting feedwater enters boiler, and each heater is sequentially drawn gas to condensate heating using what the pressure in steam turbine was incremented by respectively
Obtain high-temperature water, condensate enters described low-pressure heating unit heat exchange and obtains low-pressure heating water, described low pressure heat exchanger with least
One low-pressure heater is in parallel for partial coagulation water is thermally formed low pressure heat-exchanging water,
In described low-pressure heating unit part low-pressure heating water be incorporated into by the inlet channel of described steam air heater right in this steam air heater
Environment cold wind from pressure fan outlet is preheated, and then flows out, from the outlet conduit of described steam air heater, the steaming producing with boiler
Vapour mixes through condensing the condensate obtaining after steam turbine acting,
Low-pressure heating water is entered described deoxygenation unit and is obtained deaerated water by deoxygenation after being mixed with low pressure heat-exchanging water,
After deaerated water boosts through described feed pump, it is partly into described hyperbaric heating unit heat exchange and obtains hyperbaric heating water, separately
It is partly into described high pressure heat exchanger and is obtained high pressure heat exchange water after Hot-blast Heating, hyperbaric heating water is mixed with high pressure heat exchange water
Afterwards as boiler feedwater supply boiler heating.
2. joint thermal wind sensor according to claim 1 and the residual heat from boiler fume of steam air heater utilize system, its feature
It is：
Wherein, described low-pressure heating unit, hyperbaric heating unit all include at least one extraction heater.
3. joint thermal wind sensor according to claim 2 and the residual heat from boiler fume of steam air heater utilize system, its feature
It is：
Wherein, described low-pressure heating unit has after the acting of described steam through condensing going out of the condensing water conduit obtaining condensate
Mouth end is sequentially connected in series four extraction heaters of setting to described deoxygenation unit water inlet end.
4. joint thermal wind sensor according to claim 2 and the residual heat from boiler fume of steam air heater utilize system, its feature
It is：
Wherein, described hyperbaric heating unit has and is sequentially connected in series setting from the water side of described feed pump to described boiler feedwater end
Three extraction heaters.
5. joint thermal wind sensor according to claim 1 and the residual heat from boiler fume of steam air heater utilize system, its feature
It is：
Wherein, described recirculating air duct is provided with hot blast regulating valve, and this hot blast regulating valve is used for adjusting the heat sending into described boiler
Air quantity and the scale of recirculation hot blast rate.
6. joint thermal wind sensor according to claim 1 and the residual heat from boiler fume of steam air heater utilize system, its feature
It is：
Wherein, described deoxygenation unit is oxygen-eliminating device.
7. joint thermal wind sensor according to claim 1 and the residual heat from boiler fume of steam air heater utilize system, its feature
It is：
Wherein, described air preheater is rotary regenerative air preheater or tubular air preheater.
8. joint thermal wind sensor according to claim 1 and the residual heat from boiler fume of steam air heater utilize system, its feature
It is：
Wherein, described high pressure heat exchanger is high-pressure economizer, and described low pressure heat exchanger is low-pressure coal saver.
9. the residual heat from boiler fume of a kind of joint thermal wind sensor comprising described in any one in claim 1-8 and steam air heater
Using system efficient power generation system it is characterised in that also including：Steam Turbine, allows the steam that boiler produces to enter and to do work,
There is output shaft；Generating set, is connected with the output shaft of Steam Turbine, for generating electricity, wherein, described joint thermal wind sensor with
The residual heat from boiler fume of steam air heater utilizes a kind of therrmodynamic system that system is between boiler controller system and Steam Turbine to couple.
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| CN201610819435 | 2016-09-13 | ||
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| CN108534126A (en) * | 2018-03-23 | 2018-09-14 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | It is a kind of with pressure matcher machine stove waste heat coupling utilize system |
| CN111981465A (en) * | 2020-09-14 | 2020-11-24 | 烟台龙源电力技术股份有限公司 | A flue gas waste heat utilization system |
| CN113803706A (en) * | 2021-09-23 | 2021-12-17 | 上海理工大学 | Power generation system based on hot air recycling utilizes boiler afterbody flue gas waste heat |
| CN114263927A (en) * | 2022-03-02 | 2022-04-01 | 山西昌德大成科技有限公司 | Air heater device based on gravity heat pipe and configuration method of gravity heat pipe bundle |
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| CN107035445A (en) * | 2017-04-27 | 2017-08-11 | 华电电力科学研究院 | A kind of steam-driven induced draft fan and the united backheat therrmodynamic system of steam air heater |
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| CN107477564A (en) * | 2017-09-26 | 2017-12-15 | 山东琦泉能源科技有限公司 | A kind of biomass recirculating fluidized bed boiler flue gas waste heat recovery system and method |
| CN108534126A (en) * | 2018-03-23 | 2018-09-14 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | It is a kind of with pressure matcher machine stove waste heat coupling utilize system |
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| CN113803706A (en) * | 2021-09-23 | 2021-12-17 | 上海理工大学 | Power generation system based on hot air recycling utilizes boiler afterbody flue gas waste heat |
| CN113803706B (en) * | 2021-09-23 | 2024-04-19 | 上海理工大学 | Power generation system based on hot air recycling and utilizing waste heat of tail flue gas of boiler |
| CN114263927A (en) * | 2022-03-02 | 2022-04-01 | 山西昌德大成科技有限公司 | Air heater device based on gravity heat pipe and configuration method of gravity heat pipe bundle |
| CN114263927B (en) * | 2022-03-02 | 2022-05-24 | 山西昌德大成科技有限公司 | Air heater device based on gravity heat pipe and configuration method of gravity heat pipe bundle |
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Application publication date: 20170308 |