CN109282280A - CFB Boiler water combined recovery heat of slags system and its control method - Google Patents
CFB Boiler water combined recovery heat of slags system and its control method Download PDFInfo
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- CN109282280A CN109282280A CN201811147912.6A CN201811147912A CN109282280A CN 109282280 A CN109282280 A CN 109282280A CN 201811147912 A CN201811147912 A CN 201811147912A CN 109282280 A CN109282280 A CN 109282280A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chimneys And Flues (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Air Supply (AREA)
Abstract
The present invention relates to a kind of CFB Boiler water combined recovery heat of slags system and its control methods.Wind and water combined recycling heat of slags system includes closed cycle subsystem, cold air heating subsystem and air preheater bypass subsystem, wherein closed cycle subsystem by circulator by circulatory mediator back and forth between slag cooler and the steam air heater of cold air heating subsystem, so that clinker and cold air constantly carry out heat exchange, and the cold air after heating up is delivered to and continues to absorb the flue gas heat from boiler smoke outlet in air preheater, and extra flue gas heat successively transmit be delivered to air preheater bypass subsystem in water- to-water heat exchanger and condensation water- to-water heat exchanger, so that flue gas heat and water supply and condensed water carry out heat exchange.A kind of CFB Boiler water combined recovery heat of slags system and its control method provided by the invention, it is higher to heat of slags recovery utilization rate, to improve the efficiency of circulating fluidized bed boiler, reduce the power generation consumption coal of unit.
Description
Technical field
The present invention relates to Sector of Cfb Boilers, combine more particularly to a kind of CFB Boiler water
Recycle heat of slags system and its control method.
Background technique
Circulating fluidized bed boiler (CFB) is with fuel tolerance is wide, range of capacity is wide, efficiency of combustion is higher, using low temperature
Burning, discharged nitrous oxides are low and the advantages that can realize direct desulfurization in combustion, become and use low heat value poor quality
The preferred type of furnace of fuel station boiler.
When circulating fluidized bed boiler uses low heat value inferior fuel, the clinker of enormous amount, and slag temperature can be generated
Very high, if heat of slags be not used, thermal loss accounts for about 2% or so of boiler oil gross calorific value, the numerical value
It is considerable.
Existing circulating fluidized bed boiler recycling heat of slags system includes slag cooler, by the heat transfer of clinker when acting on
Into thermodynamic system of steam tur, to reduce thermal loss of steam turbine, but steam energy grade grade used in low-pressure heater compares
It is low, therefore heat of slags utilization efficiency is extremely limited.
Summary of the invention
Based on this, it is necessary to recycle heat of slags system because low-pressure heater is used for existing circulating fluidized bed boiler
Steam energy grade grade problem that is low, and causing heat of slags utilization rate low, it is high to provide a kind of heat of slags utilization rate
CFB Boiler water combined recovery heat of slags system and its control method.
A kind of CFB Boiler water combined recovery heat of slags system, the circulating fluidized bed boiler include first
Pipeline, air preheater and fume treatment auxiliary, the first pipe are connected to smoke outlet and the institute of the circulating fluidized bed boiler
The smoke inlet of air preheater is stated, the outlet flue of the air preheater is connected to the fume treatment auxiliary, the geomantic omen connection
Closing recycling heat of slags system includes: closed cycle subsystem, including slag cooler, the slag inlet of the slag cooler and the circulation
The slag-drip opening of fluidized-bed combustion boiler is connected to, and the slag notch of the slag cooler is connected to residue extraction mechanism；The slag cooler further includes intercommunication
The first import and first outlet；Cold air heating subsystem, including steam air heater, the air inlet of the steam air heater are used to enter cold sky
Gas, the air outlet of the steam air heater are connected to the air preheater；The steam air heater further includes the second import and of intercommunication
Two outlets；The closed cycle subsystem further includes second pipe, third pipeline and circulator, and the second pipe is connected to institute
The first import and the second outlet are stated, the third pipeline is connected to the first outlet and second import, the circulation
Device is set to the second pipe or the third pipeline；Air preheater bypasses subsystem, including the 4th pipeline, water supply change
Hot device and condensation water- to-water heat exchanger, one end of the 4th pipeline are connected to the first pipe, the other end of the 4th pipeline
It is connected to the smoke inlet to water- to-water heat exchanger, the smoke inlet of the outlet flue to water- to-water heat exchanger and the condensation water- to-water heat exchanger
The outlet flue of connection, the condensation water- to-water heat exchanger is connected to the fume treatment auxiliary.
High-grade heat of slags a part is changed into high-grade by wind and water combined recycling heat of slags system of the invention
Water supply heat, another part switchs to more low-grade condensed water heat, avoids existing recycling clinker heat to a certain extent
There are the major defects of larger irreversible loss in amount system, and circulatory mediator is in wind and water combined recycling heat of slags system
It recycles, so that circulatory mediator dosage is stablized.Therefore slag heat recovery system of the invention is to heat of slags recovery utilization rate
It is higher, to improve the efficiency of circulating fluidized bed boiler, the power generation consumption coal of unit is reduced, and then saved recirculating fluidized bed
The operating cost of boiler.
The closed cycle subsystem further includes the 5th pipeline and supplementary device in one of the embodiments,；Described
One end of five pipelines is connected to the second pipe, the other end of the 5th pipeline and the storage container for being stored with cooling medium
Connection；The supplementary device is set to the 5th pipeline, and the supplementary device is used to supplement default dosage to second pipe
The cooling medium, and maintain the pressure of the closed cycle subsystem.
The cooling medium is cooling water in one of the embodiments, and the circulator is circulating pump, the supplement
Device is small pump.
Thermodynamic system of steam tur includes feed pump, high-pressure heater, condensate pump, low pressure in one of the embodiments,
Heater and oxygen-eliminating device；The air preheater bypass subsystem further includes the 6th pipeline and the 7th pipeline, the water supply heat exchange
Device further includes that the third import of intercommunication and third outlet, the 6th pipeline are connected to the third import and the feed pump, institute
State the connection that third outlet is connected between the high-pressure heater and the circulating fluidized bed boiler by the 7th pipeline
Pipeline；The air preheater bypass subsystem further includes the 8th pipeline and the 9th pipeline, and the condensation water- to-water heat exchanger further includes
4th import of intercommunication and the 4th outlet, the 8th pipeline connection the 4th import and the condensate pump, the described 4th
Outlet is connected to the connecting pipe between the low-pressure heater and the oxygen-eliminating device by the 9th pipeline.
Air preheater bypass subsystem further includes two flow control valves in one of the embodiments, and two
The flow control valve is respectively arranged at the 6th pipeline and the 8th pipeline.
The air preheater bypass subsystem further includes adjusting door in one of the embodiments, and the adjusting door is set
It is placed on the 4th pipeline.
The wind and water combined recycling heat of slags system further includes multiple temperature detection dresses in one of the embodiments,
It sets；First inlet side of the slag cooler and the first outlet side of the slag cooler are equipped with a temperature detection
Device；The slag inlet side and slag notch side of the slag cooler are equipped with a temperature-detecting device；The outlet air of the steam air heater
Mouth side is equipped with a temperature-detecting device；The outlet flue side of the air preheater is equipped with a temperature-detecting device；Institute
It states and is equipped with a temperature-detecting device to the outlet flue side of water- to-water heat exchanger and the outlet flue side of the condensation water- to-water heat exchanger.
The closed cycle subsystem further includes flow detector in one of the embodiments,；The slag cooler
On the second pipe between first import and the circulator or second import of the steam air heater with
The third pipeline between the circulator is equipped with a flow detector.
The wind and water combined recycling heat of slags system further includes control system in one of the embodiments, the control
System processed includes master controller, the master controller respectively with multiple temperature-detecting devices, the flow detector, institute
State circulator, two flow control valves and adjusting door electrical connection.
A kind of control method of such as above-mentioned CFB Boiler water combined recovery heat of slags system, including it is following
Step: the slag temperature of the slag notch side of the slag cooler is detected；According to the furnace of the slag notch side of the slag cooler
Slag temperature controls the flow of the circulator；When the slag temperature of the slag notch side of the slag cooler is higher than first in advance
If when temperature, control increases the flow of the circulator, when the slag temperature of the slag notch side of the slag cooler is lower than
When first preset temperature, control reduces the flow of the circulator；Detect the outlet flue side of the air preheater
Flue-gas temperature；According to the flue-gas temperature of the outlet flue side of the air preheater, control enters air preheater bypass
The flue gas flow of system, when the flue-gas temperature of the outlet flue side of the air preheater is higher than the second preset temperature, control increases
The flue gas flow into air preheater bypass subsystem is added, when the flue-gas temperature of the outlet flue side of the air preheater
When lower than second preset temperature, control reduces the flue gas flow for entering air preheater bypass subsystem；Detection institute
It states to the flue-gas temperature of the outlet flue side of water- to-water heat exchanger；According to the flue-gas temperature of the outlet flue side to water- to-water heat exchanger, control
The feedwater flow to water- to-water heat exchanger, when the flue-gas temperature of the outlet flue side to water- to-water heat exchanger is higher than third preset temperature
When, control increases the feedwater flow to water- to-water heat exchanger, when the flue-gas temperature of the outlet flue side to water- to-water heat exchanger is lower than
When the third preset temperature, control reduces the feedwater flow to water- to-water heat exchanger；Detect going out for the condensation water- to-water heat exchanger
The flue-gas temperature of mouth side；According to the flue-gas temperature of the outlet flue side of the condensation water- to-water heat exchanger, the condensed water heat exchange is controlled
The condensing water flow of device, when the flue-gas temperature of the outlet flue side of the condensation water- to-water heat exchanger is higher than second preset temperature,
Control increases the condensing water flow of the condensation water- to-water heat exchanger, when the flue-gas temperature of the outlet flue side of the condensation water- to-water heat exchanger is low
When second preset temperature, control reduces the condensing water flow of the condensation water- to-water heat exchanger.
Detailed description of the invention
Fig. 1 is the structure of the CFB Boiler water combined recovery heat of slags energy conserving system of one embodiment of the invention
Schematic diagram.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein "inner", "outside", "left", "right" and
Similar statement for illustrative purposes only, is not meant to be the only embodiment.
Technical solution to facilitate the understanding of the present invention, before explanation is developed in details, first to existing recirculating fluidized bed
The heat recovery system of boiler slag is illustrated.
Existing recycling heat of slags system includes rolling-cylinder type slag-cooler, due to rolling-cylinder type slag-cooler self structure and work
The limitation of principle usually selects low pressure condensate water as cooling medium, and to absorb heat of slags, the condensed water after absorbing heat will
Heat transfer is into row thermodynamic system of steam tur, to reduce thermal loss of steam turbine.
Present inventor it has been investigated that, existing recycling heat of slags system has the following deficiencies:
1) according to the second law of thermodynamics, heat is transformed into low-grade condensed water sensible heat from high-grade clinker sensible heat,
Energy is done manual work, and there are biggish irreversible losses for ability, therefore are deposited by the way of the cooling recycling heat of slags of the condensed water of low temperature
In certain irrationality；
2) in order to avoid when condensed water is exported from slag cooler to be discharged temperature it is excessively high and vaporize, need to improve the stream of condensed water
Amount, when slag amount is larger, the condensed water that required condensed water water will be substantially improved or even unit condensate system provides is all
It is not enough to for cooled slag heat, therefore is had some limitations using existing recycling heat of slags system.
Therefore, need to provide a kind of can be avoided acting irreversible loss and is not limited by cooling medium consumption ciculation fluidized
Bed boiler geomantic omen combined recovery heat of slags system.
As shown in Figure 1, the CFB Boiler water combined recovery heat of slags system in one embodiment of the invention
100, including closed cycle subsystem 10, cold air heating subsystem 20 and air preheater bypass subsystem 30.
Circulating fluidized bed boiler 200 include first pipe 210, air preheater 220, fume treatment auxiliary 230 and, first
Pipeline 210 is connected to the smoke outlet 240 of circulating fluidized bed boiler 200 and the smoke inlet 221 of air preheater 220, air preheater
220 outlet flue 222 is connected to fume treatment auxiliary 230.It should be understood that the smoke outlet 240 of recirculating fluidized bed 200 with follow
The burner hearth 250 of ring fluidized bed 200 is connected to.
Closed cycle subsystem 10 includes slag cooler 11, slag inlet 111 and the circulating fluidized bed boiler 200 of slag cooler 11
Slag-drip opening 260 is connected to, and the slag notch 112 of slag cooler 11 is connected to residue extraction mechanism 300, slag cooler 11 further include intercommunication first into
Mouth 113 and first outlet 114.Slag cooler 11 is used to receive the high temperature furnace of the slag-drip opening 260 from circulating fluidized bed boiler 200
Slag, and will be discharged after high temperature filter residue cooling from slag notch 112.
Cold air heating subsystem 20 includes steam air heater 21, and the air inlet 211 of steam air heater 21 is used to enter cold air, steam air heater
21 air outlet 212 is connected to air preheater 220.
Steam air heater 21 further includes the second import 213 and second outlet 214 of intercommunication, and closed cycle subsystem 10 further includes
Two pipelines 12, third pipeline 13 and circulator 14, first import of the connection of second pipe 12 113 and second outlet 214, third pipe
Road 13 is connected to first outlet 114 and the second import 213, circulator 14 are set to second pipe 12 or third pipeline 13.
It includes the 4th pipeline 31, to water- to-water heat exchanger 32 and condensation water- to-water heat exchanger 33 that air preheater, which bypasses subsystem 30, and the
Four pipelines 31 are connected to the outlet flue 322 to the smoke inlet 321 and first pipe 210 of water- to-water heat exchanger 32, to water- to-water heat exchanger 32 and coagulate
The smoke inlet 331 for bearing water heat exchanger 33 is connected to, and the outlet flue 332 of condensation water- to-water heat exchanger 33 is connected to fume treatment auxiliary 230.
In this way, when circulatory mediator is added in closed cycle subsystem 10, it is by circulator 14 that circulatory mediator is defeated
Enter to second pipe 12, and be introduced to circulatory mediator in slag cooler 11 from the first import 113, high temperature furnace slag is in slag cooler 11
Interior release heat cooling, and circulatory mediator absorbs heat heating in slag cooler 11.
Then, the circulatory mediator after heating is under the driving effect of circulator 14, through being conveyed by third pipeline 13
To the second import 213 of the steam air heater 21 of cold air heating subsystem 20, heat heating is absorbed through cold air, circulatory mediator is in warm wind
Heat cooling is discharged in device 21, the circulatory mediator after cooling returns to slag cooler 11 from second pipe 12 through second outlet 214
At first import 113, circulatory mediator constantly can be translated into heat of slags constantly back and forth between slag cooler 11 and steam air heater 21
Cold air heat.
It is pre- due to entering air in the air outlet 212 to air preheater 220 that cold air after heating passes through steam air heater 21
The cold air of hot device 220 heat temperature raising, therefore cause to absorb flue gas heat in air preheater 220 and reduce, to maintain unit
Partial fume is introduced in air preheater bypass subsystem 30 by comprehensive exhaust gas temperature.
By the 4th pipeline 31, partial fume is input to the smoke inlet 321 of water- to-water heat exchanger 32, through to water- to-water heat exchanger 32
Flue gas after heat exchange cooling enters to the smoke inlet 331 of condensation water- to-water heat exchanger 33 from the outlet flue 322 to water- to-water heat exchanger 32, then
It is secondary carry out heat exchange cooling after, flue gas from condensation water- to-water heat exchanger 33 outlet flue 332 be expelled to fume treatment auxiliary 230.
Therefore, wind and water combined recycling heat of slags system 100 of the invention changes high-grade heat of slags a part
For high-grade water supply heat, another part switchs to more low-grade condensed water heat, avoids to a certain extent existing time
There are the major defects of larger irreversible loss in receipts heat of slags system, and circulatory mediator is in wind and water combined recycling clinker warm
It is recycled in amount system 100, so that circulatory mediator dosage is stablized.Therefore in conclusion wind and water combined recycling clinker of the invention
Heat system 100 is higher to heat of slags recovery utilization rate, to improve the efficiency of circulating fluidized bed boiler 200, reduces
The power generation of unit consumes coal, and then has saved the operating cost of circulating fluidized bed boiler.
In some embodiments, slag cooler 11 is rolling-cylinder type slag-cooler.Rolling-cylinder type slag-cooler is suitable for furnace complicated and changeable
Slag and coal-fired status, and structure is simple, reliable for operation and good to the lime-ash quantity of slag and granularity adaptability.
In some embodiments, closed cycle subsystem 10 further includes the 5th pipeline 15 and supplementary device 16, the 5th pipeline
15 one end is connected to second pipe 12, and the other end of the 5th pipeline 15 is connected to the storage container 17 for being stored with cooling medium,
Supplementary device 16 is set to the 5th pipeline 15, and supplementary device 16 is used to supplement the cooling medium of default dosage to second pipe 12,
And maintain the pressure of closed cycle subsystem 10.
It should be understood that supplementary device 16 maintains the pressure of closed cycle subsystem 10, which refers to circulatory mediator
Pressure in closed cycle subsystem 10, which includes the pressure that circulatory mediator passes through steam air heater 21.
Supplementary device 16 supplements the cooling medium of default dosage, including when closed cycle subsystem 10 is run for the first time
The supplement of progress cooling medium and the in the process of running supplement after coolant medium consumption.Supplementary device 16 can prevent circulatory mediator
The condition of high temperature generates vaporization, so that the heat for improving steam air heater 21 is changed, end is poor, strengthens the biography between high temperature circulation medium and cold air
Heat.
It should be understood that the storage container for being stored with cooling medium can refer to provide the system of cooling medium.
In some embodiments, cooling medium is water, and circulator 14 can be circulating pump, and supplementary device 16 is small pump.
Good heat conductivity of the water as cooling medium, and it is at low cost, and circulating pump and moisturizing pump configuration are simple and at low cost.In other realities
It applies in example, cooling medium can also be the combination of other liquid, gas or a variety of media.It should be understood that when cooling medium is
When air or other gases, circulator 14 can be circulating fan.
In some embodiments, closed cycle subsystem 10 further includes check-valves 18, and check-valves 18 is set to slag cooler 11
The first import 113 and circulator 14 between second pipe 12 on or check-valves 18 be set to the second of steam air heater 21
On third pipeline 13 between import 223 and circulator 14.Setting check-valves 18 can prevent circulatory mediator along away from circulation
The direction that 14 drive circulation medium of device makees shuttling movement is flow backwards, to cause equipment damage.
In some embodiments, steam air heater 21 may include two, the air inlet 211 of two steam air heaters 21 respectively with First air
Machine is connected to secondary air fan.It should be understood that primary air fan is fluidized for fuel, it is 200 burner hearth 250 of circulating fluidized bed boiler
Fuel provides fluidized wind, and secondary air fan is used for fuel after-flame, provides combustion for 200 burner hearth of circulating fluidized bed boiler, 250 fuel
Wind to the greatest extent.Therefore, cold air is conveyed to two steam air heaters 21 respectively using primary air fan and secondary air fan, can to enter to warm
Circulatory mediator cooling in wind device 21 is more sufficiently and quick, to reach required temperature value.
Specifically, the air outlet 212 of two steam air heaters 21 is connected to air preheater 220, and the of two steam air heaters 21
Two imports 213 are connected to the first outlet 114 of slag cooler 11, the second outlet 214 of two steam air heaters 21 with slag cooler 11
The first import 113 connection.
In some embodiments, first pipe 210 be connected to the out of stock device of SCR outlet and air preheater 220 into cigarette
The import of the mouth out of stock device of 221, SCR is connected to the smoke outlet 240 of circulating fluidized bed boiler 200.
In some embodiments, air preheater bypass subsystem 30 further includes adjusting door 34, adjusts door 34 and is set to the
On four pipelines 31.Adjust the adjustable flue gas stream entered to water- to-water heat exchanger 32 and condense water- to-water heat exchanger 33 of aperture of door 34
Amount.
In some embodiments, thermodynamic system of steam tur includes feed pump 270, condensate pump 280, high-pressure heater (figure
Do not show), low-pressure heater (not shown) and oxygen-eliminating device (not shown).
It further includes the 6th pipeline 35 and the 7th pipeline 36 that air preheater, which bypasses subsystem 30, further includes to water- to-water heat exchanger 32
The third import 323 of intercommunication and third outlet 324, the 6th pipeline 35 are connected to third import 323 and feed pump 270, third outlet
324 are connected on the connecting pipe between high-pressure heater and circulating fluidized bed boiler 200 by the 7th pipeline 36.
Air preheater bypass subsystem 30 further includes the 8th pipeline 37 and the 9th pipeline 38, and condensation water- to-water heat exchanger 33 also wraps
Include the 4th import 333 and the 4th outlet 334 of intercommunication, the 4th import 333 of the 8th pipeline 37 connection and condensate pump 280, the 4th
Outlet 334 is connected on the connecting pipe between low-pressure heater and oxygen-eliminating device by the 9th pipeline 38.
In this way, being water supply heating to water- to-water heat exchanger 32, part can be shared by the amount of high-pressure heater heating water supply, thus
The steam consumption for saving heating water supply, reduces energy consumption, and condenses water- to-water heat exchanger 33 for condensed water heating, can share
Part reduces energy consumption to save the steam consumption of heat-setting water by the amount of low-pressure heater heat-setting water.
Further, air preheater bypass subsystem 30 further includes two flow control valves 39, two flow control valves
39 are respectively arranged at the 6th pipeline 35 and the 8th pipeline 37.Wherein a flow control valve 39 is adjusted to enter from the 6th pipeline 35 and give
The feedwater flow of water- to-water heat exchanger 32, another flow control valve 39 is adjustable to enter the solidifying of condensation water- to-water heat exchanger 33 from the 8th pipeline 37
Bear water flow.
In some embodiments, wind and water combined recycling heat of slags system 100 further includes multiple temperature-detecting devices 40, cold
113 side of the first import of slag device 11 and 114 side of first outlet of slag cooler 11 are equipped with a temperature-detecting device 40, slag cooler 11
111 side of slag inlet and 112 side of slag notch be equipped with a temperature-detecting device 40,222 side of outlet flue of air preheater 220 is set
There is a temperature-detecting device 40,332 side of outlet flue of 322 side of outlet flue and condensation water- to-water heat exchanger 33 to water- to-water heat exchanger 32 is all provided with
There is a temperature-detecting device 40.Multiple temperature-detecting devices 40 are arranged can monitor temperature everywhere at any time, so as to according to temperature
The temperature that degree detection device 40 measures, temperature is in optimum temperature everywhere for control, so that wind and water combined recycling heat of slags system
100 are in least cost operating condition, and can also avoid system or equipment overheating operation and damage.
In some embodiments, wind and water combined recycling heat of slags system 100 further includes flow detector 50, flow inspection
Survey device 50 is set on the second pipe 12 between the first import 113 of slag cooler 11 and circulator 14 or flow inspection
Device 50 is surveyed to be set on the third pipeline 13 between the second import 213 of steam air heater 21 and circulator 14.Flow detection dress
Wind and water combined 100 status of recycling heat of slags system can be fed back together with synthermal detection device 40 by setting 50, and work as somewhere temperature
When degree deviates setting definite value, the flow of circulator 14 is adjusted, temperature at this can be quickly adjusted, it is wind and water combined to guarantee
Heat of slags system 100 is recycled to operate normally.
In some embodiments, temperature-detecting device 40 and flow detector 50 are also installed on the 5th pipeline 15.This
Sample can be detected out the water temperature and flow of the cooling medium supplemented to second pipe 12, to guarantee the cooling of the supplement of make-up pump 16
Medium consumption and temperature are accurate and meet the requirements.
In specific some embodiments, wind and water combined recycling heat of slags system 100 further includes control system, control system
Including master controller, master controller respectively with multiple temperature-detecting devices 40, flow detector 50, circulator 14, two
Flow control valve 39 and adjusting door 34 are electrically connected.In this way, according to temperature conditions everywhere in the feedback of temperature-detecting device 90, main control
Device can control the running speed of circulator 14 come the aperture realized automatic control to circulatory mediator, control flow control valve 39
It realizes to realize control to feedwater flow and condensing water flow and control to adjust the aperture of door 34 to entering air preheater
220 flue gas flow control, thus keep everywhere temperature in suitable range.
In specific some embodiments, control system can be DCS control system or PLC control system.More specifically, logical
Data collecting card acquisition temperature value everywhere is crossed, after processor internal arithmetic, master controller outputs control signals to circulator
14, two flow control valves 39 and adjust door 34, thus keep everywhere temperature in suitable range.
Based on above-mentioned CFB Boiler water combined recovery heat of slags system 100, the present invention also provides one kind to follow
The control method of the wind and water combined recycling heat of slags system of circulation fluidized bed boiler, comprising the following steps:
S10: the slag temperature of 112 side of slag notch of detection slag cooler 11；
Wherein, temperature-detecting device 40 can be used to detect the slag temperature of 112 side of slag notch of slag cooler 11.
S20: according to the slag temperature of 112 side of slag notch of slag cooler 11, the flow of control loop device 14 works as slag cooler
When the slag temperature of 11 112 side of slag notch is higher than the first preset temperature T1, control increases the flow of circulator 14, when cold slag
When the slag temperature of 112 side of slag notch of device 11 is lower than the first preset temperature T1, control reduces the flow of circulator 14；
S30: the flue-gas temperature of 222 side of outlet flue of detection air preheater 220；
S40: according to the flue-gas temperature of 222 side of outlet flue of air preheater 220, control enters air preheater bypass
The flue gas flow of system 30, when the flue-gas temperature of 222 side of outlet flue of air preheater 220 is higher than the second preset temperature T2,
Control increases the flue gas flow for entering air preheater bypass subsystem 30, when the cigarette of 222 side of outlet flue of air preheater 220
When temperature degree is lower than the second preset temperature T2, control reduces the flue gas flow for entering air preheater bypass subsystem 30；
Wherein, adjust the aperture for the adjusting door 34 being set on the 4th pipeline 31, i.e., it is adjustable to enter by air preheater
The flue gas flow of subsystems 30.
S50: it detects to the flue-gas temperature of 322 side of outlet flue of water- to-water heat exchanger 32；
S60: it according to the flue-gas temperature of 322 side of outlet flue to water- to-water heat exchanger 32, controls to water- to-water heat exchanger 32 to water flow
Amount, when the flue-gas temperature of 322 side of outlet flue to water- to-water heat exchanger 32 is higher than third preset temperature T3, control increases water supply heat exchange
The feedwater flow of device 32, when the flue-gas temperature of 322 side of outlet flue to water- to-water heat exchanger 32 is lower than third preset temperature T3, control
It reduces to the feedwater flow of water- to-water heat exchanger 322；
Wherein, adjust the flow control valve 39 being set on the 6th pipeline 35, i.e., it is adjustable to enter to water- to-water heat exchanger 32
Feedwater flow.
S70: the flue-gas temperature of the outlet flue side 332 of detection condensation water- to-water heat exchanger 33；
S80: according to the flue-gas temperature of the outlet flue side 332 of condensation water- to-water heat exchanger 33, control condensation water- to-water heat exchanger 33 coagulates
Flow is born water, when condensing the flue-gas temperature of 332 side of outlet flue of water- to-water heat exchanger 33 higher than the second preset temperature T2, control increases
The condensing water flow for condensing water- to-water heat exchanger 33, when the flue-gas temperature of 332 side of outlet flue of condensation water- to-water heat exchanger 33 is pre- lower than second
If when temperature T2, control reduces the condensing water flow of condensation water- to-water heat exchanger 33.
Wherein, adjust the flow control valve 39 being set on the 8th pipeline 37, i.e., it is adjustable to enter condensation water- to-water heat exchanger 33
Condensing water flow.
It should be understood that above steps should carry out simultaneously, to guarantee that heat of slags is securely and effectively recovered.
In specific one embodiment, by taking canonical parameter as an example, and using water as circulatory mediator, using cylinder type cold slag
Device, due to being limited by rolling-cylinder type slag-cooler self structure and working principle, following in wind and water combined recycling heat of slags system 100
Ring water maximum pressure can achieve 5MPa, but consider for equipment safety, and circulating water pressure is maintained by supplementary device 16
4MPa or so, corresponding saturation temperature is 250 DEG C at this time.It is existing further for preventing rolling-cylinder type slag-cooler recirculated water from generating vaporization
As combining the heat transfer strengthened between recirculated water and cold air, the typical of degree of supercooling selects temperature for 50 DEG C~150 DEG C left sides
The right side, selecting degree of supercooling is 100 DEG C, and therefore, the circulating water temperature after absorbing heat of slags is 150 DEG C or so.
Water temperature at first import 113 of slag cooler 11 is 80 DEG C or so, the clinker temperature at the slag inlet 111 of slag cooler 11
Degree be 850 DEG C or so, clinker through slag cooler 11 discharge heat after, slag temperature be reduced to 100 DEG C or so from 112 row of slag notch
Out, and the water temperature at the first outlet 114 of slag cooler 11 is warming up to 150 DEG C or so.
Under the driving of circulator 14, recirculated water enters the second import 213 of steam air heater 21, and water temperature is 150 DEG C at this time
Left and right is down to 80 DEG C or so through after 21 heat exchange of steam air heater, recirculated water discharges heat with cold air, and recirculated water is from warm
The second outlet 214 of wind device 21 is discharged, and the first import 113 of slag cooler 11 can be returned to through second pipe 12.From primary air fan
The air temperature for entering the air inlet 211 of two steam air heaters 21 with secondary air fan is respectively 35 DEG C and 27 DEG C or so, and absorption follows
After ring hydro-thermal amount, air temperature rises to 80 DEG C or so, continues to heat into flue gas heat is absorbed in air preheater 220.
The flue gas being discharged from the smoke outlet 240 of circulating fluidized bed boiler 200, flue-gas temperature is 320 DEG C or so at this time, part
Flue gas, which is delivered in air preheater 220, carries out heat exchange with cold air, and after flue gas discharges heat, flue-gas temperature is down to 115 DEG C
Left and right, the partial fume are discharged from the outlet flue 222 of air preheater 220.Other part flue gas is delivered to from the 4th pipeline 31
To heat exchange is carried out in water- to-water heat exchanger 32 with water supply, water supply enters from the third import 323 to water heat exchanger tube 32, and temperature is at this time
180 DEG C or so, absorb flue gas heat after, feed temperature rises to 280 DEG C or so, at this time flue gas from give water- to-water heat exchanger 32 smoke
Mouth 322 is discharged, and flue-gas temperature is reduced to 215 DEG C, and flue gas carries out heat exchange using condensation water- to-water heat exchanger 33 and condensed water, condenses
Water enters from the 4th import 333 of condensation water heat exchanger tube 33, and temperature is 80 DEG C at this time, after absorbing flue gas heat, condensing water temperature
150 DEG C are risen to, and flue gas is discharged from the outlet flue 332 of condensation water- to-water heat exchanger 33, flue-gas temperature is down to 115 DEG C or so.
It should be understood that needing to control in the case where the flue-gas temperature of the smoke inlet 221 of air preheater 220 is certain
Into the flue gas flow of air preheater bypass subsystem 30, to maintain wind and water combined recycling heat of slags system of the invention
The flue-gas temperature that the outlet flue 222 of slave air preheater 220 in 100 is discharged is identical as the former exhaust gas temperature of air preheater.
It should also be noted that flue-gas temperature and condensation water- to-water heat exchanger 33 in 321 side of smoke inlet to water- to-water heat exchanger 32
332 side of outlet flue flue-gas temperature it is certain in the case where, got over to the flue-gas temperature value of 322 side of outlet flue of water- to-water heat exchanger 32
Low, then it is more to be transformed into more high-grade water supply heat for recovered flue gas heat, and it is fewer to be changed into more low-grade condensed water heat.
In some embodiments, it can be determined according to the heat balance diagram and heat exchange difference of generating set to water- to-water heat exchanger 32
The flue-gas temperature value of 322 side of outlet flue.
It is 100 DEG C that the first preset temperature T1, which is arranged, and the slag temperature of 112 side of slag notch by detecting slag cooler 11 is protected
The slag temperature for holding 112 side of slag notch of slag cooler 11 is 100 DEG C.If detecting the clinker temperature of 112 side of slag notch of slag cooler 11
Degree is higher than 100 DEG C, adjusts 14 revolving speed of circulator, increases circulating water flow, if the furnace of 112 side of slag notch of detection slag cooler 11
Slag temperature is lower than 100 DEG C, adjusts 14 revolving speed of circulator, reduces circulating water flow.
It is 115 DEG C that the second preset temperature T2, which is arranged, the flue gas temperature of 222 side of outlet flue by detecting air preheater 220
Degree, keeping the flue-gas temperature of 222 side of outlet flue of air preheater 220 is 115 DEG C.If detecting the smoke of air preheater 220
The flue-gas temperature of 222 sides of mouth is higher than 115 DEG C, increases the flue gas flow for entering air preheater bypass subsystem 30, if detecting empty
The flue-gas temperature of 222 side of outlet flue of air preheater 220 is lower than 115 DEG C, reduces and enters air preheater bypass subsystem 30
Flue gas flow.Specifically, the aperture of the 4th pipeline 31 up-regulation section door 34 is adjusted to increase or decrease air preheater bypass
The flue gas flow of system 30.
It is 215 DEG C that third preset temperature T3, which is arranged, by detecting to the flue gas temperature of 322 side of outlet flue of water- to-water heat exchanger 32
Degree, keeping the flue-gas temperature to 322 side of outlet flue of water- to-water heat exchanger 32 is 215 DEG C.If detecting to the outlet flue of water- to-water heat exchanger 32
The flue-gas temperature of 322 sides is higher than 215 DEG C, increases and enters to the feedwater flow of water- to-water heat exchanger 32, if detection is to water- to-water heat exchanger 32
The flue-gas temperature of 322 side of outlet flue is lower than 215 DEG C, reduces and enters to the feedwater flow of water- to-water heat exchanger 32.Specifically, adjustable throttling
Adjustable valve 39 is increased or decreased to the feedwater flow of water- to-water heat exchanger 32.
Because the second preset temperature T2 is 115 DEG C, pass through the flue gas temperature of 332 side of outlet flue of detection condensation water- to-water heat exchanger 33
Degree, keeping the flue-gas temperature of 332 side of outlet flue of condensation water- to-water heat exchanger 33 is 115 DEG C.If detection condensation water- to-water heat exchanger 33 goes out
The flue-gas temperature of 332 side of mouth is higher than 115 DEG C, increases the condensing water flow for entering condensation water- to-water heat exchanger 33, if detection condensed water
The flue-gas temperature of 332 side of outlet flue of heat exchanger 33 is lower than 115 DEG C, reduces the condensing water flow for entering condensation water- to-water heat exchanger 33.
Specifically, regulating flow quantity regulating valve 39 come increase or decrease condensation water- to-water heat exchanger 33 condensing water flow.
It should be understood that first preset temperature T1, the second preset temperature T2 and third preset temperature T3 can have one
Fixed deviation range.
In other embodiments, due to the property difference of power plant system, the configuration variance of equipment and raw coal, lime-ash, respectively
Place's temperature can not necessarily be in some value, but be in some temperature range, for example, recirculated water is absorbed through slag cooler 11
Circulating water temperature range after heat of slags is 100 DEG C~300 DEG C, circulating water temperature model of the recirculated water after steam air heater 21 discharges heat
Enclosing is 40 DEG C~120 DEG C, can be 60 DEG C~140 DEG C through the slag temperature range after cooling of slag cooler 11.
CFB Boiler water combined recovery heat of slags system 100 and its control method in the present invention, are compared
The prior art has the advantage that
(1), subsystem is bypassed by setting closed cycle subsystem 10, cold air heating subsystem 20 and air preheater
30, high-grade heat of slags a part is changed into high-grade water supply heat, another part switchs to more low-grade condensation
Hydro-thermal amount, avoids in existing recycling heat of slags system that there are the major defects of larger irreversible loss to a certain extent；
(2), by setting supplementary device 16, a small amount of moisturizing on the one hand is provided for the circulatory system, on the other hand maintains enclosed
The pressure of cycle subsystem 10, can prevent the circulatory mediator condition of high temperature generate vaporization, thus the heat for improving steam air heater 21 change end it is poor,
Strengthen the heat transfer between high temperature circulation medium and cold air；
(3), by water- to-water heat exchanger 32 share part by high-pressure heater heat water supply amount, thus save heating to
The steam consumption of water, reduces energy consumption, shares part by low-pressure heater heat-setting water by condensing water- to-water heat exchanger 33
Amount reduce energy consumption to save the steam consumption of heat-setting water；(4), by the way that multiple temperature detection dresses are arranged
40, flow detector 50 and control system are set, it can be according to temperature conditions everywhere in the feedback of temperature-detecting device 40, control loop
The running speed of device 14 is realized to realize automatic control to circulatory mediator, control the aperture of flow control valve 39 to water supply
The control of flow and condensing water flow and the aperture of door 34 is controlled to adjust to realize to the flue gas flow for entering air preheater 220
Control, thus keep everywhere temperature in suitable range.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of CFB Boiler water combined recovery heat of slags system, the circulating fluidized bed boiler includes the first pipe
Road, air preheater and fume treatment auxiliary, the first pipe be connected to the smoke outlet of the circulating fluidized bed boiler with it is described
The smoke inlet of air preheater, the outlet flue of the air preheater are connected to the fume treatment auxiliary, which is characterized in that institute
Stating wind and water combined recycling heat of slags system includes:
Closed cycle subsystem, including slag cooler, the slag-drip opening of the slag inlet of the slag cooler and the circulating fluidized bed boiler
Connection, the slag notch of the slag cooler are connected to residue extraction mechanism；
The slag cooler further includes the first import and first outlet of intercommunication；
Cold air heating subsystem, including steam air heater, the air inlet of the steam air heater are used to enter cold air, and the steam air heater goes out
Air port is connected to the air preheater；
The steam air heater further includes the second import and second outlet of intercommunication；
The closed cycle subsystem further includes second pipe, third pipeline and circulator, described in the second pipe connection
First import and the second outlet, the third pipeline are connected to the first outlet and second import, the circulation dress
It installs and is placed in the second pipe or the third pipeline；
Air preheater bypass subsystem, including the 4th pipeline, to water- to-water heat exchanger and condensation water- to-water heat exchanger, the 4th pipeline
One end is connected to the first pipe, and the other end of the 4th pipeline is connected to the smoke inlet to water- to-water heat exchanger, described
It is connected to the outlet flue of water- to-water heat exchanger with the smoke inlet of the condensation water- to-water heat exchanger, the outlet flue of the condensation water- to-water heat exchanger and institute
State fume treatment auxiliary connection.
2. CFB Boiler water combined recovery heat of slags system according to claim 1, which is characterized in that institute
Stating closed cycle subsystem further includes the 5th pipeline and supplementary device；
One end of 5th pipeline is connected to the second pipe, the other end of the 5th pipeline and is stored with cooling medium
Storage container connection；
The supplementary device is set to the 5th pipeline, and the supplementary device is used to supplement the institute of default dosage to second pipe
Cooling medium is stated, and maintains the pressure of the closed cycle subsystem.
3. CFB Boiler water combined recovery heat of slags system according to claim 2, which is characterized in that institute
Stating cooling medium is cooling water, and the circulator is circulating pump, and the supplementary device is small pump.
4. CFB Boiler water combined recovery heat of slags system according to claim 1, which is characterized in that vapour
Turbine therrmodynamic system includes feed pump, high-pressure heater, condensate pump, low-pressure heater and oxygen-eliminating device；
Air preheater bypass subsystem further includes the 6th pipeline and the 7th pipeline, and described to water- to-water heat exchanger further includes intercommunication
Third import and third outlet, the 6th pipeline is connected to the third import and the feed pump, and the third outlet is logical
Cross the connecting pipe that the 7th pipeline is connected between the high-pressure heater and the circulating fluidized bed boiler；
The air preheater bypass subsystem further includes the 8th pipeline and the 9th pipeline, and the condensation water- to-water heat exchanger further includes mutual
The 4th logical import and the 4th outlet, the 8th pipeline are connected to the 4th import and the condensate pump, and the described 4th goes out
Mouth is connected to the connecting pipe between the low-pressure heater and the oxygen-eliminating device by the 9th pipeline.
5. CFB Boiler water combined recovery heat of slags system according to claim 4, which is characterized in that institute
Stating air preheater bypass subsystem further includes two flow control valves, and two flow control valves are respectively arranged at described the
Six pipelines and the 8th pipeline.
6. CFB Boiler water combined recovery heat of slags system according to claim 5, which is characterized in that institute
Stating air preheater bypass subsystem further includes adjusting door, and the adjusting door is set on the 4th pipeline.
7. CFB Boiler water combined recovery heat of slags system according to claim 6, which is characterized in that institute
Stating wind and water combined recycling heat of slags system further includes multiple temperature-detecting devices；
First inlet side of the slag cooler and the first outlet side of the slag cooler are equipped with a temperature inspection
Survey device；
The slag inlet side and slag notch side of the slag cooler are equipped with a temperature-detecting device；
The air outlet side of the steam air heater is equipped with a temperature-detecting device；
The outlet flue side of the air preheater is equipped with a temperature-detecting device；
It is described to be equipped with a temperature detection to the outlet flue side of water- to-water heat exchanger and the outlet flue side of the condensation water- to-water heat exchanger
Device.
8. CFB Boiler water combined recovery heat of slags system according to claim 7, which is characterized in that institute
Stating closed cycle subsystem further includes flow detector；
On the second pipe between first import of the slag cooler and the circulator or the steam air heater
Second import and the circulator between the third pipeline be equipped with a flow detector.
9. CFB Boiler water combined recovery heat of slags system according to claim 8, which is characterized in that institute
Stating wind and water combined recycling heat of slags system further includes control system, and the control system includes master controller, the main control
Device respectively with multiple temperature-detecting devices, the flow detector, the circulator, two flow control valves
And the adjusting door electrical connection.
10. a kind of CFB Boiler water combined recovery heat of slags system as described in any one of claims 1 to 9
Control method, which comprises the following steps:
Detect the slag temperature of the slag notch side of the slag cooler；
According to the slag temperature of the slag notch side of the slag cooler, the flow of the circulator is controlled；When the cold slag
When the slag temperature of the slag notch side of device is higher than the first preset temperature, control increases the flow of the circulator, works as institute
When stating the slag temperature of the slag notch side of slag cooler lower than first preset temperature, control reduces the circulator
Flow；
Detect the flue-gas temperature of the outlet flue side of the air preheater；
According to the flue-gas temperature of the outlet flue side of the air preheater, control enters air preheater bypass subsystem
Flue gas flow, when the flue-gas temperature of the outlet flue side of the air preheater is higher than the second preset temperature, control, which increases, to be entered
The flue gas flow of the air preheater bypass subsystem, when the flue-gas temperature of the outlet flue side of the air preheater is lower than institute
When stating the second preset temperature, control reduces the flue gas flow for entering air preheater bypass subsystem；
The flue-gas temperature of the detection outlet flue side to water- to-water heat exchanger；
According to the flue-gas temperature of the outlet flue side to water- to-water heat exchanger, the control feedwater flow for giving water- to-water heat exchanger works as institute
It states when being higher than third preset temperature to the flue-gas temperature of the outlet flue side of water- to-water heat exchanger, control increases the giving to water- to-water heat exchanger
Water flow, when the flue-gas temperature of the outlet flue side to water- to-water heat exchanger is lower than the third preset temperature, control reduces institute
It states to the feedwater flow of water- to-water heat exchanger；
Detect the flue-gas temperature of the outlet flue side of the condensation water- to-water heat exchanger；
According to the flue-gas temperature of the outlet flue side of the condensation water- to-water heat exchanger, the condensation water flow of the condensation water- to-water heat exchanger is controlled
Amount, when the flue-gas temperature of the outlet flue side of the condensation water- to-water heat exchanger is higher than second preset temperature, described in control increase
The condensing water flow for condensing water- to-water heat exchanger, when the flue-gas temperature of the outlet flue side of the condensation water- to-water heat exchanger is pre- lower than described second
If when temperature, control reduces the condensing water flow of the condensation water- to-water heat exchanger.
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| CN111683691A (en) * | 2018-02-06 | 2020-09-18 | 恩德斯+豪斯流量技术股份有限公司 | Method and device for detecting a non-condensable portion of an at least partially gaseous medium |
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