CN106322357A - Thermal power generation system based on boiler tail bypass flue - Google Patents
Thermal power generation system based on boiler tail bypass flue Download PDFInfo
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- CN106322357A CN106322357A CN201510765977.7A CN201510765977A CN106322357A CN 106322357 A CN106322357 A CN 106322357A CN 201510765977 A CN201510765977 A CN 201510765977A CN 106322357 A CN106322357 A CN 106322357A
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Abstract
The invention provides a thermal power generation system based on a boiler tail bypass flue. The thermal power generation system comprises a boiler body subsystem, an air supply subsystem, a tail flue subsystem, a turboset subsystem and an electric generator, wherein the boiler body subsystem comprises a boiler and a boiler flue; the air supply subsystem comprises an air feeder, a front air preheater and a flue air preheater; the tail flue subsystem comprises a high-pressure water feeding heat exchanger and a low-pressure water condensation heat exchanger; the turboset subsystem comprises a turbine, a condenser and a plurality of heaters; all the heaters sequentially use steam extraction with incremental pressure in the turbine correspondingly to heat condensation water, high-temperature condensation water is obtained, a water inlet of the front air preheater is connected with a water outlet of the second heater, and the high-temperature condensation water is used for heat exchange with environmental cold air to obtain warm air; and the multiple heaters comprises the low-pressure heaters and the high-pressure heaters.
Description
Technical field
The invention belongs to field of thermal power, be specifically related to thermal power generation system based on boiler tail bypass flue
System.
Background technology
Along with the most soaring of energy prices and energy-saving and emission-reduction require increasingly stringent, flue gas in power station boiler waste heat
Utilize in widespread attention.Using widest flue gas waste heat recovery form at present is after air preheater
Boiler exhaust gas flue in install heat exchanger (commonly referred to as low-pressure coal saver) additional, utilize the low of boiler exhaust gas
Temperature waste-heat steam turbine condenses water, thus can save part extracted steam from turbine, reach to increase unit output and
Reduce the purpose of net coal consumption rate.The place that this mode is not enough is: the temperature of boiler exhaust gas is relatively low, causes cigarette
Gas and to condense the heat transfer temperature difference of water relatively low, thus recyclable fume afterheat amount is limited, and heat exchanger cost and
Volume is relatively big, and the economy of engineer applied is the highest；It addition, the quality of low-temperature flue gas is relatively low, can only squeeze low
Pressure is drawn gas and is done work steam turbine, and heat to power output efficiency is low, the generating set finally obtained by flue gas waste heat recovery
Benefit of saving coal also ratio is relatively limited.
High for high water content brown coal exhaust gas temperature, and low-pressure coal saver scheme gained benefit of saving coal is limited
Situation, German scholar proposes and arranges the bypass flue scheme in parallel with air preheater at boiler tail.Should
Scheme flows out from bypass flue without air preheater because of part of smoke so that air preheater outlet
Flue-gas temperature is lowered；Meanwhile, utilize the of a relatively high flue gas unit feedwater of temperature in bypass flue and
Condense water so that the quality that the squeezed Steam Turbine of smoke heat energy is drawn gas improves, thus obtain relatively low pressure and save coal
The higher benefit of saving coal of device scheme.
But, in all existing bypass flue schemes, boiler air-supply all uses all by the two of flue gas
Level preheating, the air first order preheats by the low-temperature flue gas after boiler dust remover with intercycle working medium as heating agent
Adding hot-air by wall-type heat exchange, second level preheating is empty by the conventional swinging being arranged in boiler back end ductwork
Air preheater heats.The outstanding problem that this air preheat scheme exists is: in the first order preheater of air
Flue gas is the least with the air heat-exchange temperature difference, causes the equipment volume of low-temperature air preheater and cost of investment the biggest；
And because of after cleaner unit the temperature rise of low-temperature flue gas preheated air obtainable air less, enabling enter bypass
The exhaust gas volumn that flue draws gas for exclusion is less, thus unit benefit of saving coal is relatively limited；And, the most prominent
The problem gone out is, because heating surface tube wall temperature is the lowest, makes the inevitable ground of low-temperature air preheater heating surface
Face serious cold end corrosion, much more expensive corrosion-resistant of price must be used for this low-temperature air preheater heating surface
Material, this engineering feasibility seriously reducing bypass flue scheme and investment economy.
Even if it addition, have by using the preboiler that draws gas of steam turbine to blow, the efficiency of electricity generation system has
Certain increase, but, low-pressure pumping steam when directly heating boiler air-supply, steam condensation heat release one in steam air heater
Side is in negative pressure, therefore air can leak into steam side thus affect the ability of steam condensation heat release, for this reason, it may be necessary to
Air ejector device is configured in steam air heater, simultaneously as being relatively large in diameter of low-pressure steam extraction line, these
All make steam air heater plant investment and operation expense bigger.
Summary of the invention
The present invention is carried out to solve the problems referred to above, it is therefore intended that provide one to make full use of steam turbine
The heat preheating environment cold wind drawn water and the preheating feedwater of boiler tail flue gas waste heat are it can be avoided that air preheater
Cold end cold end corrosion, make the firepower based on boiler tail bypass flue that generating efficiency is greatly improved simultaneously
Electricity generation system.
The present invention provides a kind of thermal power generation system based on boiler tail bypass flue, utilize fuel heat to
Water thus generate electricity, it is characterised in that including: boiler body subsystem, air-supply subsystem, back-end ductwork
Subsystem, Steam Turbine subsystem and electromotor, wherein, boiler body subsystem comprises: be provided with burner hearth
Boiler, be connected with the outlet of burner hearth and be divided into the boiler flue of main road flue and bypass flue, air-supply
System comprises: for providing the pressure fan of environment cold wind to be connected with pressure fan for carrying out environment cold wind
Preheating obtains the preposition air preheater of warm air, is located in main road flue and carries out heating obtaining hot blast by warm air
Flue air preheater, back-end ductwork subsystem comprises: be located in bypass flue and near bypass flue
The high-pressure feed water heat exchanger of entrance and be located in bypass flue and coagulate near the low pressure of the outlet of bypass flue
Bearing water heat exchanger, Steam Turbine subsystem comprises: the steam turbine that is sequentially connected with boiler, condenser and many
Individual heater, fuel carries out combustion heating feedwater in burner hearth and obtains steam, and fuel fires inside burner hearth
Burning and generate flue gas, the warm air in flue air preheater is heated by the main road flue that is partly into of flue gas,
Another part of flue gas enters bypass flue to the feedwater in high-pressure feed water heat exchanger and low pressure condensate water heat exchanger
In condensation water heat, steam turbine utilize steam acting thus drive electromotor to generate electricity, from steamer
Machine steam out is condensed into condensation water after entering condenser, condenses water and is heated through backheat heating unit
Forming feedwater and enter boiler, each heater the most sequentially utilizes incremental the drawing gas to solidifying of the pressure in steam turbine
Bear water heating and obtain condensed water in high temperature, utilize the heater carrying out heating that draws gas of certain pressure to add as first
Hot device, utilizes higher than the heater carrying out heating that draws gas of certain pressure as secondary heater, preposition air
The water inlet of preheater is connected with the outlet of secondary heater, utilizes condensed water in high temperature to enter environment cold wind
Row heat exchange obtains warm air, and the condensed water in high temperature after heat exchange is back to the water inlet of primary heater, multiple
Heater respectively utilizes corresponding drawing gas in steam turbine to heat and obtain the multiple low of hot water condensing water
Press heater and utilize the high pressure extraction in steam turbine that hot water is heated and obtain the multiple high of feedwater
Pressure heater, low pressure condensate water heat exchanger and at least one low-pressure heater are in parallel for condensing water heating
Forming hot water, high-pressure feed water heat exchanger and at least one high-pressure heater are in parallel for being formed by hot water heating
Feedwater.
In the thermal power generation system based on boiler tail bypass flue that the present invention provides, it is also possible to there is this
The feature of sample: wherein, Steam Turbine subsystem also comprises and is located between condenser and multiple low-pressure heater
Condensate pump, condensate pump is used for boosting condensation water, multiple low-pressure heaters and multiple hyperbaric heating
Device connects in certain sequence based on the vapour pressure drawn gas extracted out from steam turbine.
In the thermal power generation system based on boiler tail bypass flue that the present invention provides, it is also possible to there is this
The feature of sample: wherein, preposition air preheater comprises: be connected between pressure fan and flue air preheater
Low-temperature air preheater, for introducing the air preheater drinking-water pipe of condensed water in high temperature in secondary heater
Road and the air preheater reflux line that the condensed water in high temperature after heat exchange is back in primary heater,
Low-temperature air preheater utilizes condensed water in high temperature preheat environment cold wind and obtain warm air.
In the thermal power generation system based on boiler tail bypass flue that the present invention provides, it is also possible to there is this
The feature of sample: wherein, preposition air preheater also comprises the water inlet and second being located at low-temperature air preheater
Booster pump between the outlet of heater, booster pump coagulates for the high temperature extracting the outlet of secondary heater
Bear water to preposition air preheater.
In the thermal power generation system based on boiler tail bypass flue that the present invention provides, it is also possible to there is this
The feature of sample: wherein, high-pressure feed water heat exchanger is provided with the septum valve of the flow for regulating hot water,
Low pressure condensate water heat exchanger is provided with the low pressure modulating valve for regulating the flow condensing water.
In the thermal power generation system based on boiler tail bypass flue that the present invention provides, it is also possible to there is this
The feature of sample: wherein, back-end ductwork subsystem also comprises: the afterbody outlet with boiler flue is sequentially connected with
Cleaner unit, air-introduced machine and desulfurizer, the outlet of air-introduced machine is connected with the import of desulfurizer.
In the thermal power generation system based on boiler tail bypass flue that the present invention provides, it is also possible to there is this
The feature of sample: wherein, boiler body subsystem comprise be positioned at gas baffle below low pressure condensate water heat exchanger,
And for regulating the regulating part of aperture size of gas baffle, the aperture of regulating part regulation gas baffle thus
Flue gas flow distribution in regulation main road flue and bypass flue.
The effect of invention and effect
In the thermal power generation system based on boiler tail bypass flue of the present invention, because boiler flue is divided into
Main road flue and bypass flue, high-pressure feed water heat exchanger and low pressure condensate water heat exchanger are utilized respectively the heat of flue gas
Amount heat hot water and condensation water, it addition, utilize the high temperature of heater outlet to condense by preposition air preheater
Environment cold wind is preheated by water, so solves existing air preheater bypass flue efficiency power generation technology and deposits
The outstanding problem of the serious cold end corrosion of low-temperature air preheater heating surface, make thermal power generation unit supply simultaneously
Electrical efficiency is greatly improved further.Its know-why is, under certain air output and hot blast temperature premise, by
The condensation used heat drawn gas in Steam Turbine preheats for boiler air-supply so that by boiler tail flue gas heating air-supply
Institute calorific requirement reduce, thus the Gao Pin that more multi-temperature is higher can be distributed in air preheater bypass flue
Matter smoke heat energy is used for heating unit and feeds water/condense water, thus reduces the high high steam of heat to power output efficiency
The amount of drawing gas, finally makes thermal power generation unit power supplying efficiency be greatly improved.Owing to preposition air preheater is adopted
Draw gas with the condensed water in high temperature ratio extracted from heater outlet and be more prone to implement, and have simple and feasible
Advantage, also completely avoid simultaneously and is heated brought significant corrosion problems by low-temperature flue gas.In addition from strengthening
Heat exchange thus reduce the angle of heat transmission equipment volume and cost, thus use from heater extracting high-temperature condense
The preposition air preheater of water heating has that obvious volume is little, maintenance cost is low, it is more safe and reliable to run,
The more preferable advantage of engineering feasibility.
Accompanying drawing explanation
Fig. 1 is the structural frames of thermal power generation system based on boiler tail bypass flue in the embodiment of the present invention one
Figure；
Fig. 2 is that in the embodiment of the present invention one, the structure of thermal power generation system based on boiler tail bypass flue is shown
It is intended to；
Fig. 3 is that in the embodiment of the present invention one, the work of thermal power generation system based on boiler tail bypass flue is shown
It is intended to；And
Fig. 4 is that in the embodiment of the present invention two, the structure of thermal power generation system based on boiler tail bypass flue is shown
It is intended to.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect,
Following example are in conjunction with the accompanying drawings and embodiments to the present invention relates to thermal power generation based on boiler tail bypass flue
System is described in detail.
<embodiment one>
Fig. 1 is the structural frames of thermal power generation system based on boiler tail bypass flue in the embodiment of the present invention one
Figure.
As it is shown in figure 1, thermal power generation system 100 based on boiler tail bypass flue utilizes fuel combustion to produce
Raw heat generates electricity, and can not only reduce high pressure extraction thus improve generating efficiency, additionally it is possible to avoid by
The heat transmission equipment etching problem that low-temperature flue gas preheated air is brought, firepower based on boiler tail bypass flue
Electricity generation system 100 includes: boiler body subsystem 10, air-supply subsystem 20, back-end ductwork subsystem 30,
Steam Turbine subsystem 40 and electromotor 50.
Fuel burns the heat feedwater to Steam Turbine subsystem 40 produced in boiler body subsystem 10
Carrying out being thermally formed the steam of High Temperature High Pressure, steam enters back in Steam Turbine subsystem 40 and does work, enters
One step drawing generator 50 generates electricity.
Fig. 2 is that in the embodiment of the present invention one, the structure of thermal power generation system based on boiler tail bypass flue is shown
It is intended to.
As in figure 2 it is shown, in the present embodiment, boiler body subsystem 10 comprises: boiler 11, boiler flue
12。
Being provided with burner hearth in boiler 11, fuel and hot blast enter burner hearth and burn, and produce substantial amounts of heat and cigarette
Gas, heat is for heating to the feedwater in boiler, and feedwater is vaporizated into the steam of High Temperature High Pressure after absorbing heat.
Flue gas enters boiler flue 12 from furnace outlet.Boiler flue 12 is connected with the outlet of burner hearth, and boiler
Flue 12 is being divided into main road flue and bypass flue after economizer.
The air-supply subsystem 20 providing hot blast for boiler 11 comprises: pressure fan 21, preposition air preheater 22 and
Flue air preheater 23.
Pressure fan 21 extracts environment cold wind, the air intake of preposition air preheater 22 and the air-out of pressure fan 21
Mouth is connected, and then obtains warm air for carrying out preheating by environment cold wind.Flue air preheater 23 is located at master
In the flue of road, utilize the flue gas in main road flue that warm air is heated further thus obtain hot blast.
Back-end ductwork subsystem 30 comprises: high-pressure feed water heat exchanger 31, low pressure condensate water heat exchanger 32, dedusting
Device 33, air-introduced machine 34, desulfurizer 35, gas baffle 36 and regulating part 37.Cleaner unit 33, air-introduced machine 34
It is sequentially connected with desulfurizer 35.
High-pressure feed water heat exchanger 31 is located in bypass flue and the entrance of close bypass flue, and flue gas is given with high pressure
Water-to-water heat exchanger 31 carries out heat exchange.Low pressure condensate water heat exchanger 32 is also provided in bypass flue but near bypass flue
Outlet, i.e., be positioned at the downstream part of high-pressure feed water heat exchanger 31, recycling is changed with high-pressure feed water heat exchanger 31
Flue gas after heat carries out heat exchange.
Gas baffle 36 is located at the afterbody of boiler flue 12, and is positioned at the low pressure condensate water heat exchange of bypass flue
The downstream part of device 32 and the downstream part of main road flue, regulating part 37, for regulating the aperture of gas baffle 36, is adjusted
Joint part 37 regulates the aperture size of gas baffle 36 thus regulates the flue gas flow in main road flue and bypass flue
Distribution.
Cleaner unit 33 exports with the afterbody of boiler flue 12 and is connected, and cools down for main road flue and bypass flue
After the flue gas that converges carry out dedusting.Flue gas through cleaner unit 33 introduces desulfurizer 35 through air-introduced machine 34 to be carried out
Desulfurization processes, and the flue gas after desulfurization processes enters air by chimney.
Steam Turbine subsystem 40 utilizes the steam of High Temperature High Pressure to generate electricity, and comprises: steam turbine 41, condensing
Device 43, condensate pump 44 and eight heaters 45.
The steam inlet of steam turbine 41 is connected with the steam (vapor) outlet of boiler 11, the exhaust vent of steam turbine 41 with
The steam inlet of condenser 43 is connected, and steam turbine 41 is connected by axle with electromotor 50.Condenser
The water out that condenses of 43 is connected with the entrance of condensate pump 44, the outlet of condensate pump 44 and eight heaters
The entrance of 45 is connected, and the outlet of eight heaters 45 is connected with the water inlet of boiler 11.
Steam enters steam turbine 41 expansion work thus drives electromotor 50 to generate electricity.Finish from steam turbine 41
The steam of merit enters condenser 43 and is condensed into as condensing water, condenses after water is boosted by condensate pump 44 and enters
Eight heaters 45.
In the present embodiment, the regenerative steam that eight heaters 45 use current thermal power generation unit typical case to apply
System " the low deoxygenation of three-hypers four " i.e., three high-pressure heaters, oxygen-eliminating device, four low-pressure heaters.
Wherein, oxygen-eliminating device be contact(-type) heater, low-pressure heater and high-pressure heater be surface heater, respectively
Hydrophobic employing gravity flow step by step in level heater, the hydrophobic entrance oxygen-eliminating device of high-pressure section, low-pressure section
Hydrophobic entrance condenser 43.
Eight heaters 45 specifically comprise and are sequentially connected with: the first low-pressure heater #8, the second low-pressure heater
#7, the 3rd low-pressure heater #6, the 4th low-pressure heater #5, oxygen-eliminating device #4, feed pump 45a, the first high pressure
Heater #3, the second high-pressure heater #2 and the 3rd high-pressure heater #1.
First low-pressure heater #8 is connected with condensate pump 44 by condensing water conduit 45b, the 3rd hyperbaric heating
Device #1 is connected with boiler 11 by feed pipe 45c.
First low-pressure heater #8, the second low-pressure heater #7, the 3rd low-pressure heater #6, the 4th low pressure add
Hot device #5, oxygen-eliminating device #4, the first high-pressure heater #3, the second high-pressure heater #2 and the 3rd high-pressure heater
#1 extracts the steam of different pressures grade in steam turbine 41 respectively and heats condensation water or hot water, usually,
First low-pressure heater #8, the second low-pressure heater #7, the 3rd low-pressure heater #6, the 4th low-pressure heater
The each self-corresponding different pressures of #5 and oxygen-eliminating device #4 draws gas referred to as low-pressure pumping steam, the first high-pressure heater #3,
Two high-pressure heater #2 and the 3rd high-pressure heater #1 each corresponding different pressures draws gas referred to as high pressure extraction.
Condense water and sequentially pass through the first low-pressure heater #8, the second low-pressure heater through condensing water conduit 45b
#7, the 3rd low-pressure heater #6, the 4th low-pressure heater #5 and oxygen-eliminating device #4 are by the low-pressure pumping steam of different pressures
Being thermally formed hot water, hot water is (water after boosting is referred to as feedwater), feedwater after feed pump 45a boosts again
Through the first high-pressure heater #3, the second high-pressure heater #2 and the 3rd high-pressure heater #1 by different pressures
High pressure extraction is thermally formed high temperature water-supply.High temperature water-supply enters boiler economizer, so completes a soda pop and follows
Ring process.Actual thermal power generation unit further comprises steam turbine high-pressure cylinder steam discharge be directed in boiler add
Heat, then, returns again to the steam reheat vapor cycle to intermediate pressure cylinder acting, is not drawn into concrete structure in figure.
In the present embodiment, preposition air preheater 22 utilizes the high temperature of the second low-pressure heater #7 outlet to coagulate
Bearing water and preheat environment cold wind, preposition air preheater 22 comprises: low-temperature air preheater 22a, air
Preheater pumping conduit 22b, air preheater reflux line 22c and booster pump 22d.
Low-temperature air preheater 22a is connected between pressure fan 21 and flue air preheater 23.In order to overcome water
Through the flow resistance of low-temperature air preheater 22a, booster pump 22d is located at air preheater pumping conduit 22b
In, one end of air preheater pumping conduit 22b is connected, separately with the water inlet of low-temperature air preheater 22a
One end and the second low-pressure heater #7 i.e., the pumping conduit corresponding to outlet of secondary heater be connected,
The condensed water in high temperature that second low-pressure heater #7 outlet flows out is drawn to Cryogenic air preheating by booster pump 22d
In device 22a.Air preheater reflux line 22c one end is connected with the outlet of low-temperature air preheater 22a,
The water inlet of the other end and the first i.e. primary heater of low-pressure heater #8 is connected, and is coagulated by the high temperature after heat exchange
Bear water the outlet introducing the first low-pressure heater #8.Realize low-temperature air preheater 22a utilization and draw water cold to environment
Wind carries out preheating and obtaining warm air.
In the present embodiment, bypass feedwater inlet channel 311 connects outlet and the high-pressure feed water of feed pump 45a
The entrance of heat exchanger 31, bypass feedwater water return pipeline 312 connects outlet and the boiler 11 of high-pressure feed water heat exchanger 31
Water inlet.A part have passed through the feedwater of feed pump 45a by bypass feedwater inlet channel 311 enter high pressure to
Water-to-water heat exchanger 31 is formed high temperature water-supply by flue gas heat exchange.Feed water and enter high pressure by bypass feedwater inlet channel 311
Formed high temperature water-supply to water-to-water heat exchanger 31 by flue gas heat exchange, then, entered by bypass feedwater water return pipeline 312
Boiler 11.Bypass feedwater inlet channel 311 is provided with control valve, it is possible to regulation enters high-pressure feed water heat exchanger
The feedwater flow of 31, thus better profit from flue gas heat.
The solidifying water inlet channel 321 of bypass connects outlet and the low pressure condensate water heat exchange of the second low-pressure heater #7
The entrance of device 32, the solidifying water water return pipeline 322 of bypass connects outlet and the oxygen-eliminating device #4 of low pressure condensate water heat exchanger 32
Water inlet.A part have passed through the condensation water of the second low-pressure heater #7 by the solidifying water inlet channel 38 of bypass
Enter low pressure condensate water heat exchanger 32 and form the solidifying water of bypass with flue gas heat exchange.Then, by the solidifying water backwater of bypass
Pipeline 322 enters in oxygen-eliminating device #4.The solidifying water inlet channel 321 of bypass is provided with control valve, it is possible to regulate into
Enter the condensing water flow of low pressure condensate water heat exchanger 32, thus better profit from flue gas heat.
Fig. 3 is the workflow of thermal power generation system based on boiler tail bypass flue in the embodiment of the present invention one
Journey schematic diagram.
As it is shown on figure 3, in the present embodiment, the burner hearth of fuel entrance boiler 11 burns together with hot blast,
Producing the high-temperature flue gas with amount of heat, high-temperature flue gas is thermally formed steam to the feedwater in boiler 11.
The circulation of feedwater: feedwater is heated to be steam in boiler 11, steam enters steam turbine 41 and does work
Thus driving electromotor 50 to generate electricity, the steam entrance condenser 43 finishing merit is condensated into condensation water, condenses water
Have passed through and utilize drawing gas of steam turbine 41 to carry out eight heaters 45 of heat exchange, utilize boiler smoke to carry out heat exchange
High-pressure feed water heat exchanger 31, to utilize high-temperature flue gas to carry out after the low pressure condensate water heat exchanger 32 of heat exchange heated
Becoming high temperature water-supply, high temperature water-supply enters the high-temperature flue gas produced by fuel combustion in boiler 11 and is thermally formed steaming
Vapour.
Air and the circulation of flue gas: environment cold wind, i.e. air are incorporated into low-temperature air preheater by pressure fan 21
In 22a, utilizing the heat of the low-pressure pumping steam of steam turbine 41 to carry out pre-thermosetting warm air, it is empty that warm air enters flue
Air preheater 23 utilizes the heat of flue gas to carry out heat exchange and forms hot blast, and hot blast produces flue gas with fuel one combust,
After flue gas carries out heat exchange with heating surface of boiler proper in boiler, part of smoke is pre-with flue air through main road flue
Hot device 23 carries out heat exchange, and another part flue gas is coagulated with high-pressure feed water heat exchanger 31 and low pressure by bypass flue
Bearing water heat exchanger 32 and carry out heat exchange, the flue gas after heat exchange all fills through cleaner unit 33, air-introduced machine 34 and desulfurization
Put 35 heel row to air.
The effect of embodiment one and effect
In the electricity generation system of the present embodiment one, because boiler flue is divided into main road flue and bypass flue, high
Press and be utilized respectively the heat hot water of flue gas to water-to-water heat exchanger and low pressure condensate water heat exchanger and condense water, separately
Outward, the condensed water in high temperature of heater is utilized environment cold wind to be preheated, so by preposition air preheater
The low-temperature air preheater heating surface solving the existence of existing air preheater bypass flue efficiency power generation technology is tight
The heavily outstanding problem of cold end corrosion, makes thermal power generation unit power supplying efficiency be greatly improved further simultaneously.Its skill
Art principle is, under certain air output and hot blast temperature premise, the condensation used heat drawn gas due to Steam Turbine is used
In boiler air-supply preheating so that reduced by institute's calorific requirement of boiler tail flue gas heating air-supply, thus can be at sky
The higher high-quality smoke heat energy of more multi-temperature is distributed for heating unit feedwater in air preheater bypass flue
/ condense water, thus reduce the amount of drawing gas of the high high steam of heat to power output efficiency, finally make thermal power generation unit
Power supplying efficiency is greatly improved.Owing to preposition air preheater uses the height of extraction from the outlet of heater
Temperature condensation water ratio draws gas and is more prone to implement, and has simple and feasible advantage, also completely avoid simultaneously
Brought significant corrosion problems is heated by low-temperature flue gas.In addition from enhanced heat exchange thus reduce heat transmission equipment body
Amass and the angle of cost, thus use extracting high-temperature from heater to condense the preposition air preheater of water heating
Have that obvious volume is little, maintenance cost is low, run more safe and reliable, the more preferable advantage of engineering feasibility.
<embodiment two>
The following is the explanation to embodiment two.
In embodiment two, for the structure identical with in embodiment one, give identical symbol, and omit
Identical explanation.
Fig. 4 is that in the embodiment of the present invention two, the structure of thermal power generation system based on boiler tail bypass flue is shown
It is intended to.
As shown in Figure 4, in the present embodiment two, thermal power generation system 200 based on boiler tail bypass flue
Including: boiler body subsystem 10, air-supply subsystem 220, back-end ductwork subsystem 30, Steam Turbine
System 40 and electromotor 50.
Air-supply subsystem 220 comprises: pressure fan 21, preposition air preheater 222 and flue air preheater 23.
Preposition air preheater 222 utilizes the condensed water in high temperature of the 4th low-pressure heater #5 outlet to enter environment cold wind
Row preheating, preposition air preheater 222 comprises: low-temperature air preheater 22a, air preheater pumping conduit
222b, air preheater reflux line 222c and booster pump 22d.
Low-temperature air preheater 22a is connected between pressure fan 21 and flue air preheater 23.In order to overcome water
Through the flow resistance of low-temperature air preheater 22a, booster pump 22d is located at air preheater pumping conduit
In 222b, one end of air preheater pumping conduit 222b is connected with the water inlet of low-temperature air preheater 22a
Logical, the pumping conduit corresponding to outlet of the other end and the 4th low-pressure heater #5 is connected, booster pump 22d
By the 4th low-pressure heater #5 i.e., that the condensed water in high temperature that flows out of the outlet of secondary heater is drawn to low temperature is empty
In air preheater 22a.Air preheater reflux line 222c one end and the outlet of low-temperature air preheater 22a
Being connected, the water inlet of the other end and the first low-pressure heater #8 is connected, by the condensed water in high temperature after heat exchange
Introduce the first low-pressure heater #8 i.e., the outlet of primary heater.Realize low-temperature air preheater 22a utilization to take out
Environment cold wind is preheated and obtains warm air by water.
The effect of embodiment two and effect
Thermal power generation system based on boiler tail bypass flue and the base in embodiment one at the present embodiment two
Thermal power generation system in boiler tail bypass flue has identical effect and effect.
In the present embodiment one and embodiment two, owing to low-temperature air preheater utilizes the drawing water to ring of heater
Border cold wind preheats, and then enters back into flue air preheater and heats, so that it is guaranteed that enter boiler
Hot blast temperature will not because partial fume heating feedwater and condense water and reduce, it is ensured that the reliability service of boiler and
Efficiency of combustion, and utilize high-temperature flue gas heating feedwater, reduce the amount of drawing gas of high-pressure heater, thus realize
Increase steam turbine output.It addition, the entering air temperature of flue air preheater raises, the most effectively
Prevent flue air preheater cold-end air heating surface cold end corrosion, and flue air preheater can be reduced further
Exit gas temperature, makes fume afterheat utilize and maximizes.Meanwhile, by increasing entrance low-temperature air preheater
Pump-out, reduce air at the caloric receptivity of flue air preheater, thus more temperature can be provided higher
Flue gas go to squeeze the drawing gas of high-quality, further increase steam turbine output and unit generation amount.
Above-mentioned embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
In the present invention, in embodiment one, low-temperature air preheater utilizes the outlet of the second low-pressure heater #7
Condensed water in high temperature environment cold wind is preheated, in embodiment two, low-temperature air preheater utilizes the 4th
Environment cold wind is preheated by drawing water in low-pressure heater #5, and in the present invention, low-temperature air preheater
The condensed water in high temperature in the first low-pressure heater #8, the 3rd low-pressure heater #6 can also be utilized environment cold wind
Preheat.
Claims (7)
1. a thermal power generation system based on boiler tail bypass flue, utilizes fuel heating feedwater thus carries out sending out
Electricity, it is characterised in that including:
Boiler body subsystem, air-supply subsystem, back-end ductwork subsystem, Steam Turbine subsystem and send out
Motor,
Wherein, described boiler body subsystem comprises: be provided with the boiler of burner hearth and the outlet phase of described burner hearth
Connect and be divided into the boiler flue of main road flue and bypass flue,
Described air-supply subsystem comprises: for providing the pressure fan of environment cold wind to be connected with described pressure fan
Obtain the preposition air preheater of warm air for described environment cold wind is preheated, be located at described main road flue
Middle described warm air being carried out heats the flue air preheater obtaining hot blast,
Described back-end ductwork subsystem comprises: be located in described bypass flue and near described bypass flue
The high-pressure feed water heat exchanger of entrance and being located in described bypass flue and near the outlet of described bypass flue
Low pressure condensate water heat exchanger,
Described Steam Turbine subsystem comprises: the steam turbine that is sequentially connected with described boiler, condenser and many
Individual heater,
Described fuel carries out feedwater described in combustion heating in described burner hearth and obtains steam, and described fuel exists
Described burner hearth internal-combustion generates flue gas,
Described flue gas be partly into described main road flue to the described warm air in described flue air preheater
Heat,
Another part of described flue gas enters described bypass flue and gives described in described high-pressure feed water heat exchanger
Condensation water in water and described low pressure condensate water heat exchanger heats,
Described steam turbine utilizes the acting of described steam thus drives described electromotor to generate electricity,
It is condensed into described condensation water after described steam turbine described steam out enters described condenser,
Described condensation water enters described boiler through the described feedwater of heated formation of described backheat heating unit,
Each described heater the most sequentially utilizes incremental the drawing gas to described condensation of the pressure in described steam turbine
Water heating obtains condensed water in high temperature, and utilizing draws gas described in certain pressure carries out the described heater conduct heated
Primary heater, utilizes and carries out the described heater that heats higher than drawing gas described in described certain pressure as the
Two heaters,
The water inlet of described preposition air preheater is connected with the outlet of described secondary heater, utilizes institute
State condensed water in high temperature described environment cold wind is carried out heat exchange to obtain described warm air, the described high temperature after heat exchange
Condense water and be back to the water inlet of described primary heater,
The plurality of heater respectively utilizes corresponding drawing gas in described steam turbine to carry out described condensation water
Heating obtains multiple low-pressure heaters of hot water and utilizes the high pressure extraction in described steam turbine to described heat
Water carries out heating and obtaining multiple high-pressure heaters of described feedwater,
Described low pressure condensate water heat exchanger and at least one described low-pressure heater are in parallel for by described condensation
Water is thermally formed described hot water,
Described high-pressure feed water heat exchanger and high-pressure heater at least one described are in parallel for being added by described hot water
Feed water described in thermosetting.
2., according to the thermal power generation system based on boiler tail bypass flue described in claim 1, its feature exists
In:
Wherein, described Steam Turbine subsystem also comprises and is located at described condenser and the plurality of low-pressure heater
Between condensate pump, described condensate pump for described condensation water is boosted,
The plurality of low-pressure heater and the plurality of high-pressure heater are based on the institute extracted out from described steam turbine
State the vapour pressure drawn gas to connect in certain sequence.
3., according to the thermal power generation system based on boiler tail bypass flue described in claim 1, its feature exists
In:
Wherein, described preposition air preheater comprises: be connected to described pressure fan and described flue air preheat
Low-temperature air preheater between device, for introducing the sky of the described condensed water in high temperature in described secondary heater
Air preheater pumping conduit and the condensed water in high temperature after heat exchange is back to the sky in described primary heater
Air preheater reflux line,
Described low-temperature air preheater utilizes described condensed water in high temperature that described environment cold wind is preheated and obtained
Described warm air.
4., according to the thermal power generation system based on boiler tail bypass flue described in claim 3, its feature exists
In:
Wherein, described preposition air preheater also comprises water inlet and the institute being located at described low-temperature air preheater
State the booster pump between the outlet of secondary heater,
Described booster pump is before the described condensed water in high temperature extracting the outlet of described secondary heater is the most described
It is empty in air preheater.
5., according to the thermal power generation system based on boiler tail bypass flue described in claim 1, its feature exists
In:
Wherein, described high-pressure feed water heat exchanger is provided with the septum valve of the flow for regulating described hot water,
Described low pressure condensate water heat exchanger is provided with the low pressure modulating valve of the flow for regulating described condensation water.
6., according to the thermal power generation system based on boiler tail bypass flue described in claim 1, its feature exists
In:
Described back-end ductwork subsystem also comprises: export, with the afterbody of described boiler flue, the dedusting being sequentially connected with
Device, air-introduced machine and desulfurizer,
The outlet of described air-introduced machine is connected with the import of described desulfurizer.
7., according to the thermal power generation system based on boiler tail bypass flue described in claim 1, its feature exists
In:
Wherein, described boiler body subsystem comprises the flue gas gear being positioned at below described low pressure condensate water heat exchanger
Plate and for regulating the regulating part of aperture size of described gas baffle,
Described regulating part regulates the aperture of described gas baffle thus regulates described main road flue and described bypass cigarette
Flue gas flow distribution in road.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510765977.7A CN106322357A (en) | 2015-11-11 | 2015-11-11 | Thermal power generation system based on boiler tail bypass flue |
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| CN201510765977.7A CN106322357A (en) | 2015-11-11 | 2015-11-11 | Thermal power generation system based on boiler tail bypass flue |
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| CN107013900A (en) * | 2017-05-22 | 2017-08-04 | 恩极而（上海）能源科技有限公司 | It is a kind of with the boiler air preheating device and its pre-heating mean that condensate is medium |
| CN108087861A (en) * | 2017-12-22 | 2018-05-29 | 芜湖德司节能科技有限公司 | A kind of boiler afterheat combined reclamation method |
| CN108375060A (en) * | 2018-02-09 | 2018-08-07 | 浙江浙能龙泉生物质发电有限公司 | A kind of Steam Turbine Regenerative System and method using medium temperature flue gas condensed water |
| CN111379604A (en) * | 2020-02-24 | 2020-07-07 | 东方电气集团东方汽轮机有限公司 | Multistage heat supply back pressure type steam turbine, thermodynamic system and heat supply method thereof |
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| CN114278959A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
| CN114278956A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
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| CN114278956A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
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