CN106895390A - A kind of station boiler multi-element heterogeneous afterheat utilizing system - Google Patents
A kind of station boiler multi-element heterogeneous afterheat utilizing system Download PDFInfo
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- CN106895390A CN106895390A CN201710257923.9A CN201710257923A CN106895390A CN 106895390 A CN106895390 A CN 106895390A CN 201710257923 A CN201710257923 A CN 201710257923A CN 106895390 A CN106895390 A CN 106895390A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
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Abstract
The present invention discloses station boiler multi-element heterogeneous afterheat utilizing system, according to flue gas circulating direction, including：A gas bypass is additionally provided between the smoke inlet end of air preheater and smoke outlet, bypass high-pressure economizer has been sequentially connected in series on gas bypass with bypass low-pressure coal saver；According to air circulation direction, the arrival end of air preheater is also passed through a cold wind and secondary cold wind, and coal pulverizer is passed through after one time cold wind converges with another road first cooling by wind again after air preheater and heat primary air cooler successively；Secondary cold wind is partly conveyed directly to burner hearth after being preheated through air preheater, and another part is sent to burner hearth after flowing through hot blast slag cooler；According to slag discharge direction, the system also includes being connected in series hot blast slag cooler and water at low temperature slag cooler, and hot blast slag cooler is directly mounted at burner hearth bottom, and hot blast slag cooler is resent to burner hearth after being also passed through the secondary cold wind in part after being preheated through air preheater；Water at low temperature slag cooler is in parallel with bypass low-pressure coal saver.
Description
Technical field
The invention belongs to energy source and power technical field, more particularly to a kind of station boiler multi-element heterogeneous afterheat utilizing system.
Background technology
At present, China's station boiler residual heat resources are a lot, but only residual heat from boiler fume has obtained recycling.Also
In the presence of the residual heat resources not being utilized a lot.
There is no the boiler air and flue system of waste heat referring to Fig. 1, the first flue gas that boiler combustion is produced flow through burner hearth (1), sky
Air preheater (2), deduster (3) and air-introduced machine (4) flow to desulphurization system.Cold wind from pressure fan (5) is by air preheat
Device heater is directly entered boiler furnace, the cold wind from primary air fan (6) point two-way, adds by air preheater (2) all the way
Turn into hot blast after heat, another road by after cold-air flap (7) regulation with first via bout into after suitable temperature by coal pulverizer (8)
Into burner hearth.
Air temperature of coal pulverizer (8) outlet necessarily be in suitable temperature range, this temperature range according to ature of coal and
Coal pulverizer it is different and different.If temperature drift, the possibility of coal dust explosion increases, and the security of power plant's operation is subject to serious
Threaten；If temperature is relatively low, the moisture in coal is unable to evaporating completely and liquid is presented, and is easily caused coal pulverizer outlet tube cell and blocks up
Plug.Therefore, Modern Power Plant adjusts coal pulverizer inlet air themperature typically by the aperture of cold-air flap (7), reaches control coal pulverizer
The purpose of outlet temperature.
1st, boiler exhaust gas waste heat
Exhaust gas temperature is general more than 120 DEG C, and heat loss due to exhaust gas accounts for the ratio of the 70~80% of boiler heat loss, mesh
The preceding energy-saving principle for smoke discharging residual heat is：The cold First air and cold two of air inlet preheater is heated using residual heat from boiler fume
Secondary wind, air preheater outlet cigarette temperature is accordingly raised.Therefore, method as shown in Figure 2 is additionally arranged air preheater bypass flue, on side
Setting bypass high-pressure economizer replacement part is high in the flue of road adds, and amount of energy saving is of a relatively high.But secondary hot-air temperature can be caused
Reduce, energy-saving effect is relatively low.
2nd, heat primary air waste heat
It is preceding it is stated that, in order to keep coal pulverizer (8) to export in suitable temperature range, by cold-air flap (7) adjust into
Enter the air themperature of coal pulverizer (8).During normal operation, the temperature of heat primary air enters coal pulverizer at 300 DEG C or so after mixing
(8) temperature is at 200 DEG C or so.Heat primary air drops to 200 DEG C and discharges partial heat from 300 DEG C, and this partial heat is directly unrestrained
Expense is fallen.
The method of existing utilization heat primary air heat is：Cancel cold-air flap (7), all of cold First air air inlet is pre-
Hot device (2).On the heat primary air pipeline of air preheater (2) outlet, the condensate of Steam Turbine Regenerative System is heated, instead of portion
Divide low adding.On the premise of Coal-fired capacity is constant, generated energy is improved.
Shortcoming of the above-mentioned heat primary air using system be：First, the total blast volume of air inlet preheater increases, and causes heat two
Secondary air temperature declines, and the amount of energy saving of system is impacted；Second, too big with heat primary air cooler heat transfer temperature difference, regulation enters heat
The condensing water flow of First air cooler, the influence to regulation coal pulverizer outlet wind-warm syndrome is limited.
3rd, the afterheat of slags of boiler
Generating plant pulverized coal boiler, the ash content in ature of coal becomes flying dust by after burning 90% ratio, with flue gas from chimney
Discharge.Remaining 10%, become slag and discharged from the furnace hopper of boiler.The temperature of slag is very high, about at 1000 DEG C or so.Electricity
Factory generally uses slag tapping boiler, lowers the temperature in the pond that high temperature furnace slag falls directly on below furnace hopper, after wasting substantial amounts of heat,
Discharged by dragveyer.
Due to flue gas, heat primary air waste heat and afterheat of slags these three residual heat resources, temperature levels are different, at present not
A kind of system, considers above-mentioned three kinds of residual heat resources, optimizes therrmodynamic system, improves therrmodynamic system economy.The present invention is directed to
This problem, proposes a kind of thermo-power station boiler multi-element heterogeneous afterheat utilizing system.It is so-called polynary, allow for three kinds or various remaining
Thermal resource.So-called heterogeneous, allowing for every kind of waste heat has different temperature grades.
The content of the invention
Regarding to the issue above, the purpose of the present invention is to propose to station boiler multi-element heterogeneous afterheat utilizing system.The present invention is comprehensive
Conjunction considers above-mentioned three kinds of residual heat resources, optimizes therrmodynamic system, improves therrmodynamic system economy.
The invention provides the first station boiler multi-element heterogeneous afterheat utilizing system.
The first station boiler multi-element heterogeneous afterheat utilizing system, according to flue gas circulating direction, including is sequentially connected in series
Air preheater, deduster, air-introduced machine and gas cooler；The smoke inlet end of air preheater and smoke outlet it
Between be additionally provided with a gas bypass, be sequentially connected in series on gas bypass bypass high-pressure economizer with bypass low-pressure coal saver；
According to air circulation direction, the arrival end of air preheater is also passed through a cold wind and secondary cold wind, a cold wind
Coal pulverizer is passed through after converging with another road first cooling by wind again after air preheater and heat primary air cooler successively；Secondary cold wind
Burner hearth is partly sent to after being preheated through air preheater, burner hearth is delivered to after partly being heated up via hot blast slag cooler.
According to slag discharge direction, the system also includes being connected in series hot blast slag cooler and water at low temperature slag cooler, and hot blast is cold
Slag device is directly mounted at burner hearth bottom, and hot blast slag cooler is also passed through after secondary time of the part hot blast after being preheated through air preheater again
It is sent to burner hearth；Water at low temperature slag cooler is arranged in parallel with air preheater bypass low-pressure coal saver.
Further, air preheater is connected by First air steam air heater with primary air fan, and the First air steam air heater is used
In the cold wind that heating primary air fan transmission comes；Air preheater is connected by Secondary Air steam air heater with pressure fan, and described two
Secondary wind steam air heater is used to heat the secondary cold wind that pressure fan transmission comes.
Further, gas cooler by closed circle water system respectively with First air steam air heater and Secondary Air steam air heater
It is connected；
Further, it is described bypass high-pressure economizer and bypass low-pressure coal saver respectively with high-pressure heater and low-pressure heating
Device is in parallel.
The invention provides second station boiler multi-element heterogeneous afterheat utilizing system.
Second station boiler multi-element heterogeneous afterheat utilizing system, it is characterised in that according to flue gas circulating direction, including according to
The secondary air preheater being connected in series, deduster, air-introduced machine and gas cooler；In the smoke inlet end of air preheater and cigarette
A gas bypass is additionally provided between the gas port of export, bypass high-pressure economizer has been sequentially connected in series on gas bypass low with bypass
Pressure economizer；
According to air circulation direction, the arrival end of air preheater is also passed through a cold wind and secondary cold wind, a cold wind
Coal pulverizer is passed through after converging with another road first cooling by wind again after air preheater and heat primary air cooler successively；Secondary cold wind
Burner hearth is partly sent to after being preheated through air preheater, burner hearth is delivered to after partly being heated up via hot blast slag cooler.
According to slag discharge direction, the system also includes being connected in series water at low temperature slag cooler and high-temperature water slag cooler, high temperature
Water slag cooler is directly mounted at burner hearth bottom, and water at low temperature slag cooler and high-temperature water slag cooler add with low-pressure heater with high pressure respectively
Hot device is in parallel.
Further, the air preheater is connected by First air steam air heater with primary air fan, the First air warm wind
Device is used to heat the cold wind that primary air fan transmission comes；Air preheater is connected by Secondary Air steam air heater with pressure fan, institute
Secondary Air steam air heater is stated for heating the secondary cold wind that pressure fan transmission comes.
Further, the gas cooler is warm with First air steam air heater and Secondary Air respectively by closed circle water system
Wind device is connected；
Further, it is described bypass high-pressure economizer and bypass low-pressure coal saver respectively with high-pressure heater and low-pressure heating
Device simultaneously connects.
The invention provides the third station boiler multi-element heterogeneous afterheat utilizing system.
The third station boiler multi-element heterogeneous afterheat utilizing system, it is characterised in that according to flue gas circulating direction, including according to
The secondary air preheater being connected in series, deduster, air-introduced machine and gas cooler；In the smoke inlet end of air preheater and cigarette
A gas bypass is additionally provided between the gas port of export, bypass high-pressure economizer has been sequentially connected in series on gas bypass low with bypass
Pressure economizer；
According to air circulation direction, the arrival end of air preheater is also passed through a cold wind and secondary cold wind, a cold wind
Coal pulverizer is passed through after converging with another road first cooling by wind again after air preheater and heat primary air cooler successively；Secondary cold wind
Burner hearth is partly sent to after being preheated through air preheater, burner hearth is delivered to after partly being heated up via hot blast slag cooler.
According to slag discharge direction, the system also includes being connected in series hot blast slag cooler and low-temperature air-cooling slag device, and hot blast is cold
Slag device is directly mounted at burner hearth bottom, and hot blast slag cooler is also passed through after secondary time of the part hot blast after being preheated through air preheater again
It is sent to burner hearth；Secondary cold wind after being heated by closed Water System delivers to air preheater through low-temperature air-cooling slag device.
Further, the air preheater is directly connected with primary air fan, and primary air fan directly send a cold wind
To air preheater；Low-temperature air-cooling slag device is directly connected with pressure fan, and secondary cold wind is fed directly to low-temperature air-cooling by pressure fan
Slag device.
Beneficial effects of the present invention are：
(1) present invention realizes the cascade utilization of heat primary air, flue gas and afterheat of slags, according to heat primary air, flue gas and
The temperature levels difference suitable low-temperature receiver working medium of heating-up temperature of slag these three residual heat resources, such as：Warm air high, low temperature wind, height
Warm water, water at low temperature；Heat primary air, flue gas and slag these three residual heat resources are considered, have optimized therrmodynamic system, improve
Therrmodynamic system economy.
(2) present invention is set using bypass flue high-pressure economizer, bypass flue low-pressure coal saver and heat primary air cooler
Condensate or feedwater for heating Steam Turbine Regenerative System, add or the low effect for adding instead of part is high.Before Coal-fired capacity is constant
Put, improve the economy of generated output and unit.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrated for explaining the application, does not constitute the improper restriction to the application.
Fig. 1 is the station boiler system structure diagram without UTILIZATION OF VESIDUAL HEAT IN；
Fig. 2 is the station boiler system structure diagram that a kind of fume afterheat is utilized；
Fig. 3 is a kind of structural representation of station boiler multi-element heterogeneous afterheat utilizing system embodiment one；
Fig. 4 is a kind of structural representation of station boiler multi-element heterogeneous afterheat utilizing system embodiment two；
Fig. 5 is a kind of structural representation of station boiler multi-element heterogeneous afterheat utilizing system embodiment three；
Fig. 6 is a kind of station boiler multi-element heterogeneous afterheat utilizing system example IV structural representation；
Fig. 7 is a kind of structural representation of station boiler multi-element heterogeneous afterheat utilizing system embodiment five.
Wherein, 1, burner hearth；2nd, air preheater；3rd, deduster；4th, air-introduced machine；5th, pressure fan；6th, primary air fan；7th, cold wind
Door；8th, coal pulverizer；9th, high-pressure heater；10th, low-pressure heater；11st, feed pump；12nd, condensate pump；13rd, gas cooler；
14th, Secondary Air steam air heater；15th, First air steam air heater；16th, high-pressure economizer is bypassed；17th, low-pressure coal saver is bypassed；18th, hot blast is cold
Slag device；19th, water at low temperature slag cooler；20th, heat primary air cooler；21st, high-temperature water slag cooler；22nd, low-temperature air-cooling slag device.
Specific embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
Be also intended to include plural form, additionally, it should be understood that, when in this manual use term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Case study on implementation one
Fig. 3 is a kind of structural representation of station boiler multi-element heterogeneous afterheat utilizing system embodiment one.
As shown in figure 3, station boiler multi-element heterogeneous afterheat utilizing system, according to flue gas circulating direction, including is sequentially connected in series
The air preheater (2) of connection, deduster (3), air-introduced machine (4) and gas cooler (13)；In the flue gas of air preheater (2)
A gas bypass is additionally provided between arrival end and smoke outlet, bypass high pressure has been sequentially connected in series on gas bypass and has been saved coal
Device (16) and bypass low-pressure coal saver (17)；
According to air circulation direction, the arrival end of air preheater (2) is also passed through a cold wind and secondary cold wind, once cold
Wind is passed through coal pulverizer after converging with another road first cooling by wind again after air preheater (2) and heat primary air cooler (20) successively
(8)；Secondary cold wind is partly sent to burner hearth (1) after being preheated through air preheater (2), and another part is by hot blast slag cooler (18)
After be sent to burner hearth (1)；
According to slag discharge direction, the system also includes being connected in series hot blast slag cooler (18) and water at low temperature slag cooler
(19), hot blast slag cooler (18) is directly mounted at burner hearth (1) bottom, and hot blast slag cooler (18) is also passed through through air preheater (2)
Burner hearth (1) is resent to after secondary cold wind after preheating；Water at low temperature slag cooler (19) water side is in parallel with low-pressure heater, instead of portion
Divide the low effect for adding.
In this embodiment, air preheater (2) is connected by First air steam air heater (15) with primary air fan (6), described
First air steam air heater (15) is for heating the cold wind that primary air fan (6) transmission comes；Air preheater (2) is warm by Secondary Air
Wind device (14) is connected with pressure fan (5), and the Secondary Air steam air heater (14) is for heating the secondary cold of pressure fan (5) transmission
Wind.
The present invention utilizes the stream of First air of the cold-air flap (7) for controlling to be entered in coal pulverizer (8) by primary air fan (6)
Amount.
Gas cooler (13) by closed circle water system respectively with First air steam air heater (14) and Secondary Air steam air heater
(15) it is connected.
Bypass high-pressure economizer (16) with bypass low-pressure coal saver (17) respectively with high-pressure heater (9) and low-pressure heater
(10) it is in parallel.
The present invention is using bypass high-pressure economizer (16) and bypass low-pressure coal saver (17) heating Steam Turbine Regenerative System
Condensate or feedwater, instead of part it is high plus or it is low plus effect so that on the premise of Coal-fired capacity is constant, improve generated output and
The economy of unit.
Wherein, condensate pump (12) is connected with low-pressure heater (10), and feed pump (11) is connected with high-pressure heater (9).
Come right with reference to flue gas flow, air flow and slag flow in station boiler multi-element heterogeneous afterheat utilizing system
The system is described in detail：
Flue gas flow：Air preheater sets bypass flue, and the flue gas from boiler enters rotary regenerative air preheater (2)
It is divided into two-way before.Air preheater (2) is flowed through all the way, and flue gas heat is passed into a Secondary Air；Another road flows through bypass cigarette
Road, in bypass high-pressure economizer (16) and bypass low-pressure coal saver (17), by flue gas heat be delivered separately to part feedwater and
Condensate, instead of the effect of partial high pressure heater (9) and low-pressure heater (10).Two-way flue gas flows separately through dedusting after converging
Device (3), air-introduced machine (4) and gas cooler (13).In gas cooler (13), flue gas heat is added by closed cycle water
Hot one or two cold wind.
Air flow：One Secondary Air enters into First air steam air heater (15) respectively through primary air fan (6) and pressure fan (5)
With Secondary Air steam air heater (14), one or two cold wind are heated using smoke discharging residual heat.A heated Secondary Air enters swinging air
Preheater (2), heat primary air is fed water by heat primary air cooler (20) heating part, instead of partial high pressure heater (9)
Effect.Heat primary air after cooled is mixed into suitable temperature with from primary air fan by the First air that bypass air door (7) comes,
Into coal pulverizer (8).Primary wind and powder mixture is directly entered burner hearth from after coal pulverizer (8) outflow.Hot Secondary Air part is directly entered
Enter burner hearth, be partly introduced in high temperature wind slag cooler (18), using high temperature furnace slag waste heat, heat hot Secondary Air, be then fed into
Burner hearth.
Condense Water flow-path：(specific extraction location is because of the actual feelings of unit for water from Steam Turbine Regenerative System low-pressure section
Condition is different), point two-way is in parallel.Enter bypass low-pressure coal saver (17) all the way, another road enters water at low temperature slag cooler (19),
Converge after absorbing preheater bypass flue flue gas heat and slag low temperature exhaust heat respectively, return to steam turbine condensate system (specific
Reentry point position because unit actual conditions it is different).
To Water flow-path：Water from feedwater pump discharge, two-way is in parallel, and bypass high-pressure economizer (16) is entered all the way, another
Road enters heat primary air cooler (20), converges after air preheater bypass flue gas heat and heat primary air high-temperature residual heat are absorbed respectively,
Return to steam turbine water supply system.
Slag flow：High-temperature boiler slag is lowered the temperature respectively through high temperature wind slag cooler (18) and water at low temperature slag cooler (19),
High temperature furnace slag heat transfer is gone out into boiler to warm air high and water at low temperature heel row.
Case study on implementation two
As shown in figure 4, to differ primarily in that instead of high temperature with high-temperature water slag cooler (21) air-cooled with case study on implementation one
Slag device (18), the high-temperature water slag cooler (21) is in parallel with heat primary air cooler (20) and bypass high-pressure economizer (16) three,
Heating comes from the feedwater of feed pump (11) outlet, three outlet hot waters of parallel connection equipment (16,20,21) and afterbody high pressure
Heater (9) outlet water lines are connected, instead of the effect of partial high pressure heater (9).Remaining pipe-line system and case study on implementation one
Approximately.
Case study on implementation three
As shown in figure 5, instead of low-temperature air-cooling with low-temperature air-cooling slag device (22) with differring primarily in that for case study on implementation one
Slag device (19), low-temperature air-cooling slag device (22) mainly heats the Secondary Air from Secondary Air steam air heater (14), by boiler low-temperature stove
After slag waste heat passes to Secondary Air, rotary regenerative air preheater (2) is entered back into.Other pipelines system is approximate with case study on implementation one.
Case study on implementation four
As shown in fig. 6, being differred primarily in that with first three case study on implementation：The mode of heating of air preheater intake air
Difference, foregoing three cases are respectively provided with gas cooler (13), First air steam air heater (14) and Secondary Air steam air heater (15) composition
Closed circle water system using fume afterheat cold wind of the heating from primary air fan (6) and pressure fan (5).
The air mode of heating of present case is：Cold wind from pressure fan (5), first flows through low-temperature air-cooling slag device (22) and carries
Rise wind-warm syndrome.Two-way is then divided into, rotary regenerative air preheater (2) is directly entered as Secondary Air all the way, another road is set once
Enter rotary regenerative air preheater (2) after blower fan (6) lifting pressure head.
Due to eliminating closed cycle formula system, therefore the system is not provided with First air steam air heater (15) and Secondary Air warm wind
Device (14), gas cooler (13) is in parallel with bypass low-pressure coal saver (17), and heating comes from steam turbine one-level low-pressure heating
The condensate of device (10) outlet, the outlet hot water of two equipment (13,17) in parallel goes out saliva with another grade of low-pressure heater (10)
Pipeline is connected, the effect of low instead of part plus (10).Remaining system is approximate with case study on implementation three.
Case study on implementation five
As shown in fig. 7, case study on implementation five is the simple version of case study on implementation four, it is possible to decrease part is invested, reach than implementing
The slightly lower energy-saving effect of case five.With differring primarily in that for case study on implementation four, the bypass cigarette of air preheater (2) is eliminated
Road, bypass high-pressure economizer (16) and bypass low-pressure coal saver (17).Replace partial high pressure using heat primary air cooler (20)
Heater (9), part low-pressure heater (10) is replaced with gas cooler (13), reaches energy-saving effect.Other systems and implementation
Case four is similar to.
The present invention realizes the cascade utilization of heat primary air, flue gas and afterheat of slags, according to heat primary air, flue gas and slag
The temperature levels difference suitable low-temperature receiver working medium of heating-up temperature of these three residual heat resources, such as：Warm air high, low temperature wind, high-temperature water,
Water at low temperature；Consider heat primary air, flue gas and slag these three residual heat resources, optimized therrmodynamic system, improve heating power
System economy.
The present invention is added using bypass flue high-pressure economizer, bypass flue low-pressure coal saver and heat primary air cooler arrangement
The condensate of Hot gas turbine heat regenerative system or feedwater, add or the low effect for adding instead of part is high.On the premise of Coal-fired capacity is constant,
Improve the economy of generated output and unit.
Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of station boiler multi-element heterogeneous afterheat utilizing system, it is characterised in that according to flue gas circulating direction, including go here and there successively
Join air preheater, deduster, air-introduced machine and the gas cooler of connection；Go out at the smoke inlet end of air preheater and flue gas
Mouth is additionally provided with a gas bypass between end, bypass high-pressure economizer has been sequentially connected in series on gas bypass and has been saved with bypass low pressure
Coal device；
According to air circulation direction, the arrival end of air preheater is also passed through a cold wind and secondary cold wind, and a cold wind is successively
Coal pulverizer is passed through after converging with another road first cooling by wind again after air preheater and heat primary air cooler；Secondary cold wind is through sky
Burner hearth is partly conveyed directly to after air preheater preheating, another part flows through hot blast slag cooler and is sent to burner hearth；
According to slag discharge direction, the system also includes being connected in series hot blast slag cooler and water at low temperature slag cooler, hot blast slag cooler
Burner hearth bottom is directly mounted at, hot blast slag cooler is resent to stove after being also passed through the secondary cold wind after being preheated through air preheater
Thorax；Water at low temperature slag cooler water side is in parallel with bypass low-pressure coal saver.
2. a kind of station boiler multi-element heterogeneous afterheat utilizing system as claimed in claim 1, it is characterised in that the air is pre-
Hot device is connected by First air steam air heater with primary air fan, and the First air steam air heater is used to heat primary air fan transmission comes one
Secondary cold wind；Air preheater is connected by Secondary Air steam air heater with pressure fan, and the Secondary Air steam air heater is used to heat pressure fan
The secondary cold wind that transmission comes.
3. a kind of station boiler multi-element heterogeneous afterheat utilizing system as claimed in claim 2, it is characterised in that the flue gas is cold
But device is connected with First air steam air heater and Secondary Air steam air heater respectively by closed circle water system.
4. a kind of station boiler multi-element heterogeneous afterheat utilizing system as claimed in claim 3, it is characterised in that the bypass is high
Pressure economizer and bypass low-pressure coal saver are in parallel with high-pressure heater and low-pressure heater respectively.
5. a kind of station boiler multi-element heterogeneous afterheat utilizing system, it is characterised in that according to flue gas circulating direction, including go here and there successively
Join air preheater, deduster, air-introduced machine and the gas cooler of connection；Go out at the smoke inlet end of air preheater and flue gas
Mouth is additionally provided with a gas bypass between end, bypass high-pressure economizer has been sequentially connected in series on gas bypass and has been saved with bypass low pressure
Coal device；
According to air circulation direction, the arrival end of air preheater is also passed through a cold wind and secondary cold wind, and a cold wind is successively
Coal pulverizer is passed through after converging with another road first cooling by wind again after air preheater and heat primary air cooler；Secondary cold wind is through sky
Burner hearth is partly conveyed directly to after air preheater preheating, another part is sent to burner hearth after flowing through hot blast slag cooler；
According to slag discharge direction, the system also includes being connected in series water at low temperature slag cooler and high-temperature water slag cooler, high-temperature water cooling
Slag device is directly mounted at burner hearth bottom, and water at low temperature slag cooler and high-temperature water slag cooler are low with bypass high-pressure economizer and bypass respectively
Pressure economizer is in parallel.
6. a kind of station boiler multi-element heterogeneous afterheat utilizing system as claimed in claim 5, it is characterised in that the air is pre-
Hot device is connected by First air steam air heater with primary air fan, and the First air steam air heater is used to heat primary air fan transmission comes one
Secondary cold wind；Air preheater is connected by Secondary Air steam air heater with pressure fan, and the Secondary Air steam air heater is used to heat pressure fan
The secondary cold wind that transmission comes.
7. a kind of station boiler multi-element heterogeneous afterheat utilizing system as claimed in claim 6, it is characterised in that the flue gas is cold
But device is connected with First air steam air heater and Secondary Air steam air heater respectively by closed circle water system；
8. a kind of station boiler multi-element heterogeneous afterheat utilizing system as claimed in claim 7, it is characterised in that the bypass is high
Pressure economizer and bypass low-pressure coal saver are connected with high-pressure heater and low-pressure heater respectively.
9. a kind of station boiler multi-element heterogeneous afterheat utilizing system, it is characterised in that according to flue gas circulating direction, including go here and there successively
Join air preheater, deduster, air-introduced machine and the gas cooler of connection；Go out at the smoke inlet end of air preheater and flue gas
Mouth is additionally provided with a gas bypass between end, bypass high-pressure economizer has been sequentially connected in series on gas bypass and has been saved with bypass low pressure
Coal device；
According to air circulation direction, the arrival end of air preheater is also passed through a cold wind and secondary cold wind, and a cold wind is successively
Coal pulverizer is passed through after converging with another road first cooling by wind again after air preheater and heat primary air cooler；Secondary cold wind is through sky
Burner hearth is sent to after air preheater preheating；
According to slag discharge direction, the system also includes being connected in series hot blast slag cooler and low-temperature air-cooling slag device, hot blast slag cooler
It is directly mounted at burner hearth bottom；Secondary cold wind after being heated delivers to air preheater through low-temperature air-cooling slag device.
10. a kind of station boiler multi-element heterogeneous afterheat utilizing system as claimed in claim 9, it is characterised in that the air
Preheater is directly connected with primary air fan, and a cold wind is fed directly to air preheater by primary air fan；Low-temperature air-cooling slag device
Directly it is connected with pressure fan, secondary cold wind is fed directly to low-temperature air-cooling slag device by pressure fan.
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| CN107654995A (en) * | 2017-08-11 | 2018-02-02 | 北京慧峰仁和科技股份有限公司 | Three points of storehouse air preheater gas bypass heat First airs and the method for feedwater |
| CN108826269A (en) * | 2018-07-23 | 2018-11-16 | 中国能源建设集团山西省电力勘测设计院有限公司 | The utilization system of fume afterheat and deslagging waste heat based on CFB boiler |
| CN110836365A (en) * | 2019-12-11 | 2020-02-25 | 中国电力工程顾问集团西北电力设计院有限公司 | Waste heat utilization system and method for circulating fluidized bed boiler of thermal power plant |
| CN111442256A (en) * | 2020-04-29 | 2020-07-24 | 北京慧峰仁和科技股份有限公司 | System and method for heating primary air, water supply and circulating water by using bypass flue gas |
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