CN109708105A - The novel recovery system of circulating fluid bed boiler slag heat and its control method - Google Patents
The novel recovery system of circulating fluid bed boiler slag heat and its control method Download PDFInfo
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- CN109708105A CN109708105A CN201811637023.8A CN201811637023A CN109708105A CN 109708105 A CN109708105 A CN 109708105A CN 201811637023 A CN201811637023 A CN 201811637023A CN 109708105 A CN109708105 A CN 109708105A
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Abstract
The present invention relates to a kind of novel recovery system of circulating fluid bed boiler slag heat and its control methods.Slag heat recovery system includes slag cooler, and the slag inlet of slag cooler is connected to the slag-drip opening of circulating fluidized bed boiler, and the slag notch of slag cooler is connected to residue extraction mechanism；Slag cooler further includes the first import and first outlet of intercommunication；To water- to-water heat exchanger, including the second import and second outlet；Condense water- to-water heat exchanger, including third import and third outlet, second outlet and third inlet communication；First pipe is connected to the first import and third outlet；Second pipe is connected to first outlet and the second import；Circulator is set to first pipe or second pipe, and circulator makees shuttling movement for drive circulation medium in slag heat recovery system.The novel recovery system of circulating fluid bed boiler slag heat provided by the invention and its control method, it is higher to heat of slags recovery utilization rate, reduce the power generation consumption coal of unit.
Description
Technical field
The present invention relates to Sector of Cfb Boilers, more particularly to a kind of circulating fluid bed boiler slag heat
Novel recovery 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
The novel recovery system of circulating fluid bed boiler slag heat and its control method.
A kind of novel recovery system of circulating fluid bed boiler slag heat, including slag cooler, including slag inlet and slag notch,
The slag inlet of the slag cooler is connected to the slag-drip opening of the circulating fluidized bed boiler, and slag notch and the deslagging of the slag cooler are set
Standby connection；The slag cooler further includes the first import and first outlet of intercommunication；To water- to-water heat exchanger, including the second import and second
Outlet；Condense water- to-water heat exchanger, including third import and third outlet, the second outlet and the third inlet communication；First
Pipeline is connected to first import and third outlet；Second pipe is connected to the first outlet and second import；
Circulator is set to the first pipe or the second pipe, and the circulator is for drive circulation medium described
Make shuttling movement in the novel recovery system of circulating fluid bed boiler slag heat.
The above-mentioned novel recovery system of circulating fluid bed boiler slag heat 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 circulating fluid bed boiler slag
It is recycled in the novel recovery system of heat, so that circulatory mediator dosage is stablized.Therefore circulating fluid bed boiler slag of the invention
The novel recovery system of heat is higher to heat of slags recovery utilization rate, reduces the power generation consumption coal of unit, and then has saved circulation
The operating cost of fluidized-bed combustion boiler.
The novel recovery system of circulating fluid bed boiler slag heat further includes third pipe in one of the embodiments,
Road；One end of the third pipeline is connected to the first pipe, the other end of the third pipeline and is stored with circulatory mediator
Storage container connection, the novel recovery system of circulating fluid bed boiler slag heat by the third pipeline to first manage
Road supplements the circulatory mediator of default dosage.
The circulatory mediator is conduction oil in one of the embodiments,.
Operating temperature of the circulatory mediator under normal pressure state is greater than 250 DEG C in one of the embodiments,.
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 novel recovery system of circulating fluid bed boiler slag heat further includes the 4th pipeline and the 5th pipe
Road, described to water- to-water heat exchanger further includes that the 4th import of intercommunication and the 4th outlet, the 4th pipeline are connected to the 4th import
With the feed pump, the 4th outlet is connected to the high-pressure heater and the recirculating fluidized bed by the 5th pipeline
Connecting pipe between boiler；The novel recovery system of circulating fluid bed boiler slag heat further includes the 6th pipeline and the 7th
Pipeline, the condensation water- to-water heat exchanger further include the 5th import and the 5th outlet of intercommunication, the 6th pipeline connection the described 5th
Import and the condensate pump, the 5th outlet are connected to the low-pressure heater and the deoxygenation by the 7th pipeline
Connecting pipe between device.
The novel recovery system of circulating fluid bed boiler slag heat further includes two streams in one of the embodiments,
Adjustable valve, two flow control valves are respectively arranged at the 4th pipeline and the 6th pipeline.
The novel recovery system of circulating fluid bed boiler slag heat further includes multiple temperature in one of the embodiments,
Spend detection device；The slag inlet side and the slag notch side of the slag cooler are equipped with a temperature-detecting device；Institute
It states and is equipped with a temperature-detecting device to second inlet side of water- to-water heat exchanger；Described second to water- to-water heat exchanger goes out
The third inlet side of mouth side or the condensation water- to-water heat exchanger is equipped with a temperature-detecting device；And the condensation water- to-water heat exchanger
The third outlet side be equipped with a temperature-detecting device.
The novel recovery system of circulating fluid bed boiler slag heat further includes flow inspection in one of the embodiments,
Survey device；In the first pipe between first import of the slag cooler and the circulator or the water supply
The second pipe between second import of heat exchanger and the circulator is equipped with a flow detector.
The novel recovery system of circulating fluid bed boiler slag heat further includes control system in one of the embodiments,
System, the control system includes master controller, and the master controller is examined with multiple temperature-detecting devices, the flow respectively
Survey device, the circulator and two flow control valve electrical connections.
A kind of control method of such as above-mentioned novel recovery system of circulating fluid bed boiler slag heat, comprising the following steps:
Detect the slag temperature of the slag notch side of the slag cooler；According to the clinker temperature of the slag notch side of the slag cooler
Degree, controls the flow of the circulator；When the slag temperature of the slag notch side of the slag cooler is higher than the first default temperature
When spending, control increases the flow of the circulator, when the slag temperature of the slag notch side of the slag cooler is lower than described
When the first preset temperature, control reduces the flow of the circulator；The detection second outlet side for giving water- to-water heat exchanger
Or the circulatory mediator temperature of the third inlet side of the condensation water- to-water heat exchanger；According to described to described the second of water- to-water heat exchanger
The circulatory mediator temperature of the third inlet side of outlet side or the condensation water- to-water heat exchanger, controls the giving to water- to-water heat exchanger
Water flow, when following for the third inlet side of the second outlet side to water- to-water heat exchanger or the condensation water- to-water heat exchanger
When ring medium temperature is higher than the second preset temperature, control increases the feedwater flow to water- to-water heat exchanger, when the water supply exchanges heat
The circulatory mediator temperature of the third inlet side of the second outlet side of device or the condensation water- to-water heat exchanger is lower than described the
When two preset temperatures, control reduces the feedwater flow to water- to-water heat exchanger；Detect the third of the condensation water- to-water heat exchanger
The circulatory mediator temperature of outlet side；According to the circulatory mediator temperature of the third outlet side of the condensation water- to-water heat exchanger, control
The condensing water flow of the condensation water- to-water heat exchanger, when the circulatory mediator temperature of the third outlet side of the condensation water- to-water heat exchanger
When higher than the third preset temperature, control increases the condensing water flow of the condensation water- to-water heat exchanger, when the condensed water exchanges heat
When the circulatory mediator temperature of the third outlet side of device is lower than the third preset temperature, control reduces the condensed water heat exchange
The condensing water flow of device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the novel recovery system of circulating fluid bed boiler slag heat of one embodiment of the invention.
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 slag heat recovery system.
As shown in Figure 1, the novel recovery system 100 of circulating fluid bed boiler slag heat in one embodiment of the invention, packet
Include slag cooler 10, to water- to-water heat exchanger 20, condensation water- to-water heat exchanger 25, first pipe 30, second pipe 35 and circulator 40.
Slag cooler 10 includes slag inlet 11 and slag notch 12, the slag-drip opening 210 of slag inlet 11 and circulating fluidized bed boiler 200
Connection, slag notch 12 are connected to residue extraction mechanism 300, and slag cooler 10 further includes the first import 13 and first outlet 14 of intercommunication.It is cold
Slag device 10 is used to receive the high temperature furnace slag of the slag-drip opening 210 from circulating fluidized bed boiler 200, and will be after high temperature furnace slag cooling
It is discharged from slag notch 12.It should be understood that slag cooler 10 has the cooling system of the first import 13 and first outlet 14 of connection,
Cooling system is used to absorb the heat of high temperature furnace slag into cooling medium.
It include the second import 21 and second outlet 22 to water- to-water heat exchanger 20, condensation water- to-water heat exchanger 25 includes 26 He of third import
Third outlet 27, second outlet 22 is connected to third import 26.
It should be understood that having the first heating system of the second import 21 of connection and second outlet 22 to water- to-water heat exchanger 20
System, the first heating system is used to discharge the heat of heat medium into water supply, to carry out heat temperature raising to water supply；Condensed water changes
Hot device 25 has the second heating system of connection third import 26 and third outlet 27, and heating system is for discharging heat medium
Heat is into condensed water, to carry out heat temperature raising to condensed water.
First import 13 of the connection of first pipe 30 and third outlet 27, second pipe 35 be connected to first outlet 14 and second into
Mouth 21, circulator 40 are set to first pipe 30 or second pipe 35, and circulator 40 is for drive circulation medium in clinker
Make shuttling movement in heat recovery system 100.
Make in the novel recovery system 100 of circulating fluid bed boiler slag heat it should be understood that circulatory mediator refers to
The medium of shuttling movement also includes through to water- to-water heat exchanger 20 and condensation water- to-water heat exchanger 25 including the cooling medium through slag cooler 10
Heat medium.
In this way, when circulatory mediator is added in the novel recovery system 100 of circulating fluid bed boiler slag heat, by the
Circulatory mediator is introduced in slag cooler 10 by one import 13, and high temperature furnace slag discharges heat cooling in slag cooler 10, and recycles and be situated between
Matter absorbs heat heating in slag cooler 10, and then, the circulatory mediator after heating is under the driving effect of circulator 40, through logical
It crosses second pipe 35 to be transported to water- to-water heat exchanger 20, water supply absorbs heat heating, and circulatory mediator discharges heat cooling, and circulation is situated between
Matter is transported to condensation water- to-water heat exchanger 25 again, and the heating of condensed water absorption heat, circulatory mediator release heat cools down again, final to pass through
First pipe 30 returns at the first import 13 of slag cooler 10, and circulatory mediator can constantly back and forth exchange heat in slag cooler 10, water supply
Between device 20 and condensation water- to-water heat exchanger 25, heat of slags is constantly translated into water supply and condensed water heat.
Therefore, the novel recovery system 100 of circulating fluid bed boiler slag heat of the invention is by high-grade heat of slags
A part is transformed into more high-grade water supply heat, and another part is transformed into more low-grade condensed water heat, to a certain degree
On avoid in existing slag heat recovery system there are the major defect of larger irreversible loss, and circulating fluidized bed boiler
It is recycled in the novel recovery system 100 of heat of slags, so that circulatory mediator dosage is stablized.Therefore in conclusion of the invention follows
The novel recovery system 100 of circulation fluidized bed boiler heat of slags is high to heat of slags recovery efficiency, reduces the power generation consumption coal of unit,
And then the operating cost of circulating fluidized bed boiler is saved.
In some embodiments, slag cooler 10 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, the novel recovery system 100 of circulating fluid bed boiler slag heat further includes third pipeline 45,
One end of third pipeline 45 is connected to first pipe 30, the other end of third pipeline 45 and the storage container for being stored with circulatory mediator
50 connections, the novel recovery system 100 of circulating fluid bed boiler slag heat are supplemented by third pipeline 45 to first pipe 30 pre-
If the circulatory mediator of dosage.
The novel recovery system 100 of circulating fluid bed boiler slag heat is supplemented by third pipeline 45 to first pipe 30 pre-
If the circulatory mediator of dosage, including when the novel recovery system 100 of circulating fluid bed boiler slag heat is run for the first time into
Supplement after the supplement of row circulatory mediator and in the process of running circulatory mediator loss.
It should be understood that the storage container 50 for being stored with circulatory mediator can refer to provide the system of circulatory mediator.
In some embodiments, the storage container 50 for being stored with circulatory mediator can be placed on to a high position, and by first pipe
30 are placed on low level, in this way, the novel recovery system 100 of circulating fluid bed boiler slag heat can be automatic by third pipeline 45
Circulatory mediator is supplemented to first pipe 30.
In some embodiments, circulatory mediator selects the good working medium of heat transfer property under the conditions of high-temperature low-pressure.
Specifically, it is conduction oil that circulatory mediator, which can be selected,.Conduction oil has heat transfer coefficient height, thermostabilization as circulatory mediator
Property good, higher boiling, low condensation point, nontoxicity or hypotoxicity and it is non-corrosive the advantages that.
In addition, because it has the heat transfer property of high-temperature low-pressure, can reduce entire when using conduction oil as circulatory mediator
System compression grade also meets the system service requirement of working medium high-temperature low-pressure in rolling-cylinder type slag-cooler, follows without additionally increasing
Ring pressure medium vaporizes to prevent from generating under its condition of high temperature, to make full use of the high temperature heat of clinker.
Preferably, operating temperature of the conduction oil under normal pressure state is greater than 250 DEG C.According to circulating fluidized bed boiler to water temperature
The difference of degree should select the operating temperature under normal pressure state to be greater than the conduction oil of boiler feed temperature, and retain certain temperature
Allowance meets the needs of terminal temperature difference and safe operation, to reach the optimum state for the high temperature heat for making full use of clinker.
Further, circulator 40 is oil circulating pump.
In some embodiments, the novel recovery system 100 of circulating fluid bed boiler slag heat further includes check-valves 55, only
Valve 55 is returned to be set in the first pipe 30 between the first import 13 of slag cooler 10 and circulator 40 or check-valves 55 is set
It is placed in on the second pipe 35 between the second import 21 of water- to-water heat exchanger 20 and circulator 40.Setting check-valves 55 can be prevented
Only circulatory mediator is flow backwards along away from the direction that 40 drive circulation medium of circulator makees shuttling movement, so that equipment be caused to damage
It is bad.
In some embodiments, thermodynamic system of steam tur includes feed pump 220, condensate pump 230, high-pressure heater (figure
Do not show), low-pressure heater (not shown) and oxygen-eliminating device (not shown).
The novel recovery system 100 of circulating fluid bed boiler slag heat further includes the 4th pipeline 60 and the 5th pipeline 65, is given
Water- to-water heat exchanger 20 further includes that the 4th import 23 of intercommunication and the 4th outlet 24, the 4th pipeline 60 are connected to the 4th import 23 and feed pump
220, the 4th outlet 24 is connected to the connecting pipe between high-pressure heater and circulating fluidized bed boiler 200 by the 5th pipeline 65
On.
The novel recovery system 100 of circulating fluid bed boiler slag heat further includes the 6th pipeline 70 and the 7th pipeline 75, is coagulated
Bear water the 5th import 28 and the 5th outlet 29 that heat exchanger 25 further includes intercommunication, the 5th import 28 of the 6th pipeline 70 connection and condensation
Water pump 230, the 5th outlet 29 are connected on the connecting pipe between low-pressure heater and oxygen-eliminating device by the 7th pipeline 75.
In this way, being water supply heating to water- to-water heat exchanger 20, 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 25 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, the novel recovery system 100 of circulating fluid bed boiler slag heat further includes two flow control valves 80,
Two flow control valves 80 are respectively arranged at the 4th pipeline 60 and the 6th pipeline 70.Wherein a flow control valve 80 is adjustable from the
Four pipelines 60 enter to the feedwater flow of water- to-water heat exchanger 20, and another flow control valve 80 is adjustable to enter condensation from the 6th pipeline 70
The condensing water flow of water- to-water heat exchanger 25.
In some embodiments, the novel recovery system 100 of circulating fluid bed boiler slag heat further includes multiple temperature inspections
Device 85 is surveyed, 11 side of slag inlet and 12 side of slag notch of slag cooler 10 are equipped with a temperature-detecting device 85, give water- to-water heat exchanger 20
21 side of the second import be equipped with a temperature-detecting device 85,22 side of second outlet to water- to-water heat exchanger 20 or condensation water- to-water heat exchanger 25
26 side of third import be equipped with a temperature-detecting device 85, the third of condensation water- to-water heat exchanger 25 exports 27 sides and is equipped with a temperature
Detection device 85.Multiple temperature-detecting devices 85 are arranged can monitor temperature everywhere at any time, so as to be filled according to temperature detection
85 temperature measured are set, temperature is in optimum temperature everywhere for control, so that the novel recycling system of circulating fluid bed boiler slag heat
System 100 is in least cost operating condition, and can also avoid system or equipment overheating operation and damage.
In some embodiments, the novel recovery system 100 of circulating fluid bed boiler slag heat further includes flow detection dress
90 are set, flow detector 90 is set in the first pipe 30 between the first import 13 of slag cooler 10 and circulator 40,
Or flow detector 90 is set to on the second pipe 35 between the second import 21 of water- to-water heat exchanger and circulator 40.
Flow detector 90 can maintain together the novel recovery system of circulating fluid bed boiler slag heat with synthermal detection device 85
100 statuses, and when definite value is arranged in somewhere temperature departure, through adjusting the flow of circulator 40, it can quickly be adjusted this
Locate temperature, to guarantee that the novel recovery system 100 of circulating fluid bed boiler slag heat operates normally.
In specific some embodiments, the novel recovery system 100 of circulating fluid bed boiler slag heat further includes control system
System, control system include master controller, master controller respectively with multiple temperature-detecting devices 85, flow detector 90, circulation
Device 40 and two flow control valves 80 are electrically connected.In this way, according to temperature conditions everywhere in the feedback of temperature-detecting device 90, master control
Device processed can control the running speed of circulator 40 to realize that automatic control to circulatory mediator, control flow control valve 80 are opened
Degree to realize the control to feedwater flow and condensing water flow, 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
40 and two flow control valves 80, thus keep everywhere temperature in suitable range.
Based on the novel recovery system 100 of above-mentioned circulating fluid bed boiler slag heat, the present invention also provides one kind for following
The control method of the slag heat recovery system of circulation fluidized bed boiler, comprising the following steps:
S10: the slag temperature of 12 side of slag notch of detection slag cooler 10；
Wherein, temperature-detecting device 85 can be used to detect the slag temperature of 12 side of slag notch of slag cooler 10.
S20: according to the slag temperature of 12 side of slag notch of slag cooler 10, the flow of control loop device 40 works as slag cooler
When the slag temperature of 10 12 side of slag notch is higher than the first preset temperature T1, control increases the flow of circulator 40, when cold slag
When the slag temperature of 12 side of slag notch of device 10 is lower than the first preset temperature T1, control reduces the flow of circulator 40；
S30: detecting 22 side of second outlet to water- to-water heat exchanger 20 or condenses following for 26 side of third import of water- to-water heat exchanger 25
Ring medium temperature；
S40: according to the second outlet 22 to water- to-water heat exchanger 20 or the circulation for 26 side of third import for condensing water- to-water heat exchanger 25
Medium temperature, control enters to the feedwater flow of water- to-water heat exchanger 20, when the circulatory mediator of the second outlet 22 to water- to-water heat exchanger 20
When temperature is higher than the second preset temperature T2, control, which increases, to be entered to the feedwater flow of water- to-water heat exchanger 20, when to water- to-water heat exchanger 20
When the circulatory mediator temperature of second outlet 22 is lower than the second preset temperature T2, control, which is reduced, to be entered to water- to-water heat exchanger 20 to water flow
Amount；
Wherein, adjust the flow control valve 80 being set on the 4th pipeline 60, i.e., it is adjustable to enter to water- to-water heat exchanger 20
Feedwater flow.
S70: the third of detection condensation water- to-water heat exchanger 25 exports the circulatory mediator temperature of 27 sides；
S80: the circulatory mediator temperature of 27 sides, control condensation water- to-water heat exchanger 25 are exported according to the third of condensation water- to-water heat exchanger 25
Condensing water flow, when condensation water- to-water heat exchanger 25 third export 27 sides circulatory mediator temperature be higher than third preset temperature T3
When, control increases the condensing water flow of condensation water- to-water heat exchanger 25, when the circulation that the third of condensation water- to-water heat exchanger 25 exports 27 sides is situated between
When matter temperature is lower than third preset temperature T3, control reduces the condensing water flow of condensation water- to-water heat exchanger 25.
Wherein, adjust the flow control valve 80 being set on the 6th pipeline 70, i.e., it is adjustable to enter condensation water- to-water heat exchanger 25
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 conduction oil as circulatory mediator, normality boiling point
It is 333 DEG C, 333 DEG C can be heated under normal pressure state without vaporizing.Circulating heat conduction oil energy under normal pressure state
It is enough that some biographies thermal process such as heat absorption, heat release are completed in the range of operating temperature section is -20 DEG C~320 DEG C, without additional
Increase pressure to prevent from generating vaporization phenomenon under the circulatory mediator condition of high temperature in rolling-cylinder type slag-cooler.To the 4th of water- to-water heat exchanger 20 the
The feed temperature of outlet 24 is 285 DEG C, and circulating heat conduction oil exchanges heat between water supply in water- to-water heat exchanger 20, degree of supercooling
For 10 DEG C~40 DEG C, preferably 15 DEG C, therefore, the oil temperature of the circulating heat conduction oil after absorbing heat of slags is 300 DEG C or so.
Thermally conductive oil temperature at first import 13 of slag cooler 10 is 80 DEG C or so, the furnace at the slag inlet 11 of slag cooler 10
Slag temperature be 850 DEG C or so, clinker through slag cooler 10 discharge heat after, slag temperature be reduced to 100 DEG C or so from slag notch 12
Discharge, and the thermally conductive oil temperature at the first outlet 14 of slag cooler 10 is warming up to 300 DEG C or so.
Under the driving of circulator 40, circulating heat conduction oil enters to the second import 21 of water- to-water heat exchanger 20, thermally conductive at this time
Oil temperature is 300 DEG C or so, and after heat exchange between the water supply to water- to-water heat exchanger 20, circulating heat conduction oil discharges heat, is down to
190 DEG C or so, and circulating heat conduction oil is discharged from the second outlet 22 to water- to-water heat exchanger 20.4th import of feed-water heater 20
23 water supply water temperature is 180 DEG C or so, and after absorption cycle conduction oil heat, feed temperature rises to 285 DEG C or so, passes through the 4th
Outlet 24 is expelled to the 5th pipeline 65, hence on the connecting pipe between high-pressure heater and circulating fluidized bed boiler 200.
Circulating heat conduction oil enters and condensation 25 condensed water of water- to-water heat exchanger using the third import 26 of condensation water- to-water heat exchanger 25
Between carry out heat exchange, condensed water enters from the 5th import 28 of condensation water- to-water heat exchanger 25, and temperature is 65 DEG C at this time, absorption cycle
After conduction oil heat, condensing water temperature rises to 150 DEG C, the 7th pipeline 75 is expelled to by the 5th outlet 29, hence into low
Press the connecting pipe between heater and oxygen-eliminating device.And circulating heat conduction oil is discharged from the third outlet 27 of condensation water- to-water heat exchanger 25,
Circulating heat conduction oil temperature is down to 80 DEG C or so.
It should be pointed out that thermally conductive oil temperature and condensation water- to-water heat exchanger 25 in 21 side of the second import to water- to-water heat exchanger 20
Third export 27 sides thermally conductive oil temperature it is certain in the case where, exchange heat to 22 side of second outlet of water- to-water heat exchanger 20 or condensed water
The conduction oil temperature value of 26 side of third import of device 25 is lower, then recycles conduction oil heat and be transformed into more high-grade water supply heat
It is more, 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 20
The conduction oil temperature value of 22 side of second outlet or 26 side of third import of condensation water- to-water heat exchanger 25.
It is 100 DEG C that the first preset temperature T1, which is arranged, and the slag temperature of 12 side of slag notch by detecting slag cooler 10 is kept
The slag temperature of 12 side of slag notch of slag cooler 10 is 100 DEG C.If the slag temperature for detecting 12 side of slag notch of slag cooler 10 is high
In 100 DEG C, 40 revolving speed of circulator is adjusted, increases circulating heat conduction oil stream amount, if the furnace of 12 side of slag notch of detection slag cooler 10
Slag temperature is lower than 100 DEG C, adjusts 40 revolving speed of circulator, reduces circulating heat conduction oil stream amount.
It is 190 DEG C that the second preset temperature T2, which is arranged, by detecting to 22 side of second outlet of water- to-water heat exchanger 20 or condensed water
The thermally conductive oil temperature of 26 side of third import of heat exchanger 25 keeps exchanging heat to 22 side of second outlet of water- to-water heat exchanger 20 or condensed water
The thermally conductive oil temperature of 26 side of third import of device 25 is 190 DEG C.If detection is to 22 side of second outlet of water- to-water heat exchanger 20 or condensation
The thermally conductive oil temperature of 26 side of third import of water- to-water heat exchanger 25 is higher than 190 DEG C, increases and enters to the 4th import of water- to-water heat exchanger 20
23 feedwater flow, if detecting 22 side of second outlet to water- to-water heat exchanger 20 or condensing 26 side of third import of water- to-water heat exchanger 25
Thermally conductive oil temperature is lower than 190 DEG C, reduces and enters to the feedwater flow of the 4th import 23 of water- to-water heat exchanger 20.Specifically, it is adjusted
The aperture of flow control valve 80 on 4th pipeline 60 come increase or decrease into water- to-water heat exchanger 20 the 4th import 23 to
Water flow.
It is 80 DEG C that third preset temperature T3, which is arranged, passes through the conduction oil of the third outlet side 27 of detection condensation water- to-water heat exchanger 25
Temperature, keeping the thermally conductive oil temperature of the third outlet side 27 of condensation water- to-water heat exchanger 25 is 80 DEG C.If detection condensation water- to-water heat exchanger 25
Third outlet side 27 conduction oil be higher than 80 DEG C, increase enter condensation water- to-water heat exchanger 25 the 5th import 28 condensation water flow
Amount, if the thermally conductive oil temperature of the third outlet side 27 of detection condensation water- to-water heat exchanger 25 is lower than 80 DEG C, reduction enters condensed water and exchanges heat
The condensing water flow of 5th import 28 of device 25.Specifically, the aperture for the flow control valve 80 being adjusted on the 6th pipeline 70 is come
Increase or decrease the condensing water flow of the 5th import 28 into condensation water- to-water heat exchanger 25.
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 10
Circulating heat conduction oil after heat of slags is 250 DEG C~400 DEG C, circulation of the circulating heat conduction oil after discharging heat to water- to-water heat exchanger 20
Conduction oil temperature range is 150 DEG C~230 DEG C, circulating heat conduction oil of the circulating heat conduction oil after condensation water- to-water heat exchanger 25 discharges heat
Temperature range 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 10.
The novel recovery system 100 of circulating fluid bed boiler slag heat and its control method in the present invention, compared to existing
Technology has the advantage that
(1), the heat of clinker in slag cooler 10 is absorbed by setting circulatory mediator, then circulatory mediator is delivered to water supply and is changed
It exchanges heat, high-grade heat of slags a part is changed into high-grade to hydro-thermal in hot device 20 and condensation water- to-water heat exchanger 25
Amount, another part switch to more low-grade condensed water heat, are avoided in existing recycling heat of slags system to a certain extent
There are the major defects of larger irreversible loss；
(2), by selecting heat transfer coefficient height, good thermal stability, higher boiling, low condensation point, nontoxicity (or toxicity is low), nothing
Corrosive conduction oil has the heat transfer property of high-temperature low-pressure as cycle operation medium, can reduce whole system compression etc.
Grade, meets the system service requirement of working medium high-temperature low-pressure in rolling-cylinder type slag-cooler, comes without the additional circulatory mediator pressure that increases
It prevents from generating vaporization under its condition of high temperature, to make full use of the high temperature heat of clinker；
(3), it by the way that multiple temperature-detecting devices 85, flow detector 90 and control system is arranged, can be examined according to temperature
Survey temperature conditions everywhere in the feedback of device 85, the running speed of control loop device 40 realizes the automatic control to circulatory mediator
System controls the aperture of flow control valve 80 to realize the control to feedwater flow and condensing water flow, to keep temperature everywhere
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 novel recovery system of circulating fluid bed boiler slag heat characterized by comprising
Slag cooler, including slag inlet and slag notch, 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；
To water- to-water heat exchanger, including the second import and second outlet；
Condense water- to-water heat exchanger, including third import and third outlet, the second outlet and the third inlet communication；
First pipe is connected to first import and third outlet；
Second pipe is connected to the first outlet and second import；
Circulator, is set to the first pipe or the second pipe, and the circulator exists for drive circulation medium
Make shuttling movement in the novel recovery system of circulating fluid bed boiler slag heat.
2. the novel recovery system of circulating fluid bed boiler slag heat according to claim 1, which is characterized in that described to follow
The novel recovery system of circulation fluidized bed boiler heat of slags further includes third pipeline；
One end of the third pipeline is connected to the first pipe, the other end of the third pipeline and is stored with circulatory mediator
Storage container connection, the novel recovery system of circulating fluid bed boiler slag heat is by the third pipeline to described the
One pipeline supplements the circulatory mediator of default dosage.
3. the novel recovery system of circulating fluid bed boiler slag heat according to claim 1, which is characterized in that described to follow
Ring medium is conduction oil.
4. the novel recovery system of circulating fluid bed boiler slag heat according to claim 3, which is characterized in that described to follow
Operating temperature of the ring medium under normal pressure state is greater than 250 DEG C.
5. the novel recovery system of circulating fluid bed boiler slag heat according to claim 1, which is characterized in that steam turbine
Therrmodynamic system includes feed pump, high-pressure heater, condensate pump, low-pressure heater and oxygen-eliminating device；
The novel recovery system of circulating fluid bed boiler slag heat further includes the 4th pipeline and the 5th pipeline, and the water supply is changed
Hot device further includes that the 4th import of intercommunication and the 4th outlet, the 4th pipeline are connected to the 4th import and the feed pump,
4th outlet is connected to the company between the high-pressure heater and the circulating fluidized bed boiler by the 5th pipeline
It threads a pipe；
The novel recovery system of circulating fluid bed boiler slag heat further includes the 6th pipeline and the 7th pipeline, the condensed water
Heat exchanger further includes that the 5th import of intercommunication and the 5th outlet, the 6th pipeline are connected to the 5th import and the condensed water
Pump, the 5th outlet are connected to the communicating pipe between the low-pressure heater and the oxygen-eliminating device by the 7th pipeline
Road.
6. the novel recovery system of circulating fluid bed boiler slag heat according to claim 5, which is characterized in that described to follow
The novel recovery system of circulation fluidized bed boiler heat of slags further includes two flow control valves, and two flow control valves are set respectively
It is placed in the 4th pipeline and the 6th pipeline.
7. the novel recovery system of circulating fluid bed boiler slag heat according to claim 6, which is characterized in that described to follow
The novel recovery system of circulation fluidized bed boiler heat of slags further includes multiple temperature-detecting devices；
The slag inlet side and the slag notch side of the slag cooler are equipped with a temperature-detecting device；
Second inlet side to water- to-water heat exchanger is equipped with a temperature-detecting device；
It is described to be equipped with a temperature to the second outlet side of water- to-water heat exchanger or the third inlet side of the condensation water- to-water heat exchanger
Spend detection device；
The third outlet side of the condensation water- to-water heat exchanger is equipped with a temperature-detecting device.
8. the novel recovery system of circulating fluid bed boiler slag heat according to claim 7, which is characterized in that described to follow
The novel recovery system of circulation fluidized bed boiler heat of slags further includes flow detector；
In the first pipe between first import of the slag cooler and the circulator or the water supply is changed
The second pipe between second import of hot device and the circulator is equipped with a flow detector.
9. the novel recovery system of circulating fluid bed boiler slag heat according to claim 8, which is characterized in that described to follow
The novel recovery system of circulation fluidized bed boiler heat of slags further includes control system, and the control system includes master controller, described
Master controller respectively with multiple temperature-detecting devices, the flow detector, the circulator and two streams
Adjustable valve electrical connection.
10. a kind of control of the novel recovery system of circulating fluid bed boiler slag heat as described in any one of claims 1 to 9
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；
The third inlet side of the detection second outlet side or condensation water- to-water heat exchanger to water- to-water heat exchanger follows
Ring medium temperature；
According to following for the third inlet side of the second outlet side to water- to-water heat exchanger or the condensation water- to-water heat exchanger
Ring medium temperature, the control feedwater flow for giving water- to-water heat exchanger, when the second outlet side to water- to-water heat exchanger or institute
When stating the circulatory mediator temperature of the third inlet side of condensation water- to-water heat exchanger higher than the second preset temperature, given described in control increase
The feedwater flow of water- to-water heat exchanger, when described the of the second outlet side to water- to-water heat exchanger or the condensation water- to-water heat exchanger
When the circulatory mediator temperature of triple feed inlet side is lower than second preset temperature, control reduction is described to give water flow to water- to-water heat exchanger
Amount；
Detect the circulatory mediator temperature of the third outlet side of the condensation water- to-water heat exchanger；
According to the circulatory mediator temperature of the third outlet side of the condensation water- to-water heat exchanger, the condensation water- to-water heat exchanger is controlled
Condensing water flow, when the circulatory mediator temperature of the third outlet side of the condensation water- to-water heat exchanger is higher than the default temperature of the third
When spending, control increases the condensing water flow of the condensation water- to-water heat exchanger, when the third outlet side of the condensation water- to-water heat exchanger
Circulatory mediator temperature be lower than the third preset temperature when, control reduce it is described condensation water- to-water heat exchanger condensing water flow.
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Cited By (1)
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