CN106322357A - Thermal power generation system based on boiler tail bypass flue - Google Patents

Thermal power generation system based on boiler tail bypass flue Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
flue
water
pressure
boiler
heater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510765977.7A
Other languages
Chinese (zh)
Inventor
马有福
杨丽娟
岳荣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Shanghai for Science and Technology
Original Assignee
University of Shanghai for Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Shanghai for Science and Technology filed Critical University of Shanghai for Science and Technology
Priority to CN201510765977.7A priority Critical patent/CN106322357A/en
Publication of CN106322357A publication Critical patent/CN106322357A/en
Pending legal-status Critical Current

Links

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

Thermal power generation system based on boiler tail bypass flue
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.
CN201510765977.7A 2015-11-11 2015-11-11 Thermal power generation system based on boiler tail bypass flue Pending CN106322357A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510765977.7A CN106322357A (en) 2015-11-11 2015-11-11 Thermal power generation system based on boiler tail bypass flue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510765977.7A CN106322357A (en) 2015-11-11 2015-11-11 Thermal power generation system based on boiler tail bypass flue

Publications (1)

Publication Number Publication Date
CN106322357A true CN106322357A (en) 2017-01-11

Family

ID=57726226

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510765977.7A Pending CN106322357A (en) 2015-11-11 2015-11-11 Thermal power generation system based on boiler tail bypass flue

Country Status (1)

Country Link
CN (1) CN106322357A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH063071A (en) * 1992-03-06 1994-01-11 Gea Luftkuehler Gmbh Device for utilizing heat included in exhaust gas of coal fired boiler forming component of electric power plant
CN202109457U (en) * 2011-05-27 2012-01-11 华西能源工业股份有限公司 Large-scale heat load adjusting device for gas boiler
CN103486567A (en) * 2013-07-15 2014-01-01 华北电力大学 Boiler-turbine coupled flue gas waste heat utilization system capable of preheating air based on condensed water
CN203533526U (en) * 2013-09-17 2014-04-09 西安西热锅炉环保工程有限公司 Waste-heat utilization system ensuring lignite boiler dry output and SCR safe smoke temperature
CN203671577U (en) * 2013-12-18 2014-06-25 华北电力大学 Efficient waste heat recovery system of machine and boiler coupled air cooling power station
CN204026644U (en) * 2014-04-02 2014-12-17 华北电力大学 A kind of type of bypass flue on a large scale surplus heat of power plant utilizes system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH063071A (en) * 1992-03-06 1994-01-11 Gea Luftkuehler Gmbh Device for utilizing heat included in exhaust gas of coal fired boiler forming component of electric power plant
CN202109457U (en) * 2011-05-27 2012-01-11 华西能源工业股份有限公司 Large-scale heat load adjusting device for gas boiler
CN103486567A (en) * 2013-07-15 2014-01-01 华北电力大学 Boiler-turbine coupled flue gas waste heat utilization system capable of preheating air based on condensed water
CN203533526U (en) * 2013-09-17 2014-04-09 西安西热锅炉环保工程有限公司 Waste-heat utilization system ensuring lignite boiler dry output and SCR safe smoke temperature
CN203671577U (en) * 2013-12-18 2014-06-25 华北电力大学 Efficient waste heat recovery system of machine and boiler coupled air cooling power station
CN204026644U (en) * 2014-04-02 2014-12-17 华北电力大学 A kind of type of bypass flue on a large scale surplus heat of power plant utilizes system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Similar Documents

Publication Publication Date Title
CN102607014B (en) Boiler water replenishing system capable of collecting waste heat and condensed water
CN102080582B (en) Coal-fired power generation and waste heat power generation coupling system for private station of cement kiln
CN202432505U (en) Flue gas waste heat recovery utilization system of coal burning boiler
CN103644743B (en) Combination system for efficiently using waste heat in iron mine sintering cooling process
CN101806230A (en) System and method for using sintering waste heat to generate electricity
CN107120714B (en) A kind of whole yearization comprehensive utilization energy conserving system
CN101619662A (en) Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way
CN105973017B (en) Ring cold machine waste gas residual heat utilization system
CN101178017A (en) Method for recycling and regenerating steel plant residual heat boiler saturated steam
CN101788233B (en) Heating-furnace cogeneration system and method thereof
CN203431902U (en) Smoke system reducing exhaust smoke temperature of secondary reheating boiler
CN102767821B (en) Smoke waste heat deep utilization system of power station boiler for heating supplied water at high pressure
CN204730303U (en) The heating system of the 12MW small cogeneration unit under a kind of underrun operating mode
CN101392992B (en) Silicon smelting electric furnace waste heat power generation process flow and configuration
CN102454980B (en) Method for recycling flue gas waste heat of thermal power plant boiler
CN203501144U (en) Waste heat recovery system for gas-fired boiler
CN205383632U (en) Natural gas waste heat of boiler flue gas cascade utilization system
CN104006401B (en) The degree of depth of boiler of power plant fume afterheat is recycled and emission-reducing system
CN202328165U (en) Smoke energy cascaded utilization system and thermal power generator set adopting same
CN103353121B (en) A kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system
CN203823787U (en) Comprehensive smoke waste heat utilization system
CN103234362A (en) Device and process for generating power through efficient recovery of waste heat of sintered ores
CN204593354U (en) Fume afterheat energy level utilizes system
CN204739568U (en) Energy saving and emission reduction system that horizontal phase transition heat exchanger and prefix type hydrophily formula GGH unite
CN103062754B (en) Power station machine furnace integrated cold end comprehensive optimization system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20170111

WD01 Invention patent application deemed withdrawn after publication