CN108870372A - Once-through Boiler drained water recovery system and method based on high-low pressure hydrophobic development unit - Google Patents
Once-through Boiler drained water recovery system and method based on high-low pressure hydrophobic development unit Download PDFInfo
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- CN108870372A CN108870372A CN201810697204.3A CN201810697204A CN108870372A CN 108870372 A CN108870372 A CN 108870372A CN 201810697204 A CN201810697204 A CN 201810697204A CN 108870372 A CN108870372 A CN 108870372A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
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- General Engineering & Computer Science (AREA)
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of Once-through Boiler drained water recovery systems and method based on high-low pressure hydrophobic development unit, including including separator, separator water storage tank, high pressure draining flash vessel, low pressure hydrophobic development unit, oxygen-eliminating device, condenser, unit rhone, other steam user and starting drainage pump；The hydrophobic of separator enters high pressure draining flash vessel by separator water storage tank；Steam in high pressure draining flash vessel is delivered to oxygen-eliminating device and other steam user carries out heat recovery and arranges extra discharge of steam to low pressure hydrophobic development unit to atmosphere by exhaust pipe；When water quality qualification, drain discharge to oxygen-eliminating device is subjected to heat recovery or extra drain discharge to condenser, carries out the recycling of working medium；When water quality is unqualified, by drain discharge into low pressure hydrophobic development unit, unit rhone is emitted by starting drainage pump.
Description
Technical field
The present invention relates to a kind of Once-through Boiler drained water recovery systems, and in particular to a kind of nothing based on high-low pressure hydrophobic development unit
Start circulating pump Once-through Boiler drained water recovery system and method.
Background technique
Overcritical at present and extra-supercritical unit is already known to main force's unit of Power Plant in China.Since Once-through Boiler does not have
There are drum and natural convection loop, just needs to keep the feedwater flow of about 30% rated capacity since igniting, to guarantee water
The minimum flow rate of cold wall, and boiler just enters DC load under about 30% rated loan condition, therefore is entering DC load
Before, boiler has a large amount of working medium and heat to pass through starting separator and starting separator water storage tank discharge.It is common at present to open
Dynamic system is as follows：
Simple atmosphere flash-off start-up system, compound atmosphere flash-off start-up system, starting drainage heat exchanger starting system
System, recirculation pump activation system, condenser type activation system.
Simple atmosphere flash-off start-up system：During boiler startup, hydrophobic the expanding through air suspended type of starting separator discharge
Saturated vapor is discharged into atmosphere after container dilatation, and saturation is hydrophobic to enter drain tank, drains into circulation by delivery pump when water quality is unqualified
Water return water drains into condenser by delivery pump when water quality qualification.The activation system initial investment is lower, but the steam row after separation
Enter atmosphere, the loss of working medium and heat is larger.
Compound atmosphere flash-off start-up system：During boiler startup, start hydrophobic a part in separator through atmosphere
Saturated vapor is discharged into atmosphere after formula flash vessel dilatation, be saturated it is hydrophobic enter drain tank, when water quality qualification, is drained into solidifying by delivery pump
Vapour device.Input oxygen-eliminating device recycles working medium and heat after starting the amphiphilicity decompression in separator.Due to separator outlet
Pressure is more than 8MPa (g), and the design pressure 1.2MPa (g) of oxygen-eliminating device before entering DC load, and starting is hydrophobic to be entered
When oxygen-eliminating device, since pressure drop can generate huge kinetic energy impact and damage element in oxygen-eliminating device, and it is accompanied by nearly 100dB (A)
The underwater injection noise of steam, recycling working medium there are potential dangers.Although having the correlative study reality for installing noise elimination energy dissipating additional at present
It tests, but noise is still in the left and right 80dB (A).And oxygen-eliminating device recycling ability is limited, significant portion of working medium recycling is still by big
Gas formula flash vessel, so during startup by loss section division of labor matter and most of heat.
Start drainage heat exchanger activation system：During boiler startup, the hydrophobic of starting separator generation works as water quality not
It is hydrophobic to pass through economizer when water quality qualification through boiler body hydrophobic development unit steam discharge decompression heel row to speciality of hydroelectric power engineering construction when qualified
Starting drainage heat exchanger and the boiler feedwater of entrance exchange heat, and recycle heat, improve feed temperature.And after decrease temperature and pressure
It is hydrophobic to be discharged into oxygen-eliminating device comparatively safely, when the receiving amount or accident conditions for being more than oxygen-eliminating device, it is discharged into after spray desuperheating
Condenser.Start hydrophobic heat and obtain cascade utilization, do not lose working medium and heat, but invests high, system structure complexity.
Recirculation pump activation system：According to the connecting mode of recirculation pump and feed pump, and tandem and parallel connection can be divided into
Formula.Recirculation pump flow a part carrys out the referred to as tandem activation system of self-water-supply, and recirculation pump flow all is from starting point
It is known as parallel activation system from device.It is hydrophobic caused by steam-water separator during boiler startup, when water quality is unqualified
When, through boiler body hydrophobic development unit steam discharge decompression heel row to speciality of hydroelectric power engineering construction, when water quality qualification, hydrophobic recycled pump is again
Into economizer entrance.The system has many advantages, such as to start the time short, does not lose working medium and heat, but system complex, investment
Height, repair and maintenance are costly.There are cavitation danger in recirculation pump, and dedicated pipeline is arranged and improves hydrophobic degree of supercooling.
Condenser type activation system：It is hydrophobic caused by starting separator, it is hydrophobic through boiler body when water quality is unqualified
Flash vessel steam discharge decompression heel row is hydrophobic that condenser, accident are all discharged into after pressure and temperature reducing when water quality qualification to speciality of hydroelectric power engineering construction
Operating condition is discharged into water conservancy project recirculated water return water.The activation system does not lose working medium during startup, but loses most of heat.It is hydrophobic
It deals with improperly and often causes former thermally equilibrated destruction in condenser, cause back pressure to increase, influence unit output, can also cause to rush
It hits, vibrate, the problems such as condenser pipe is damaged, shell is drawn up.
In conclusion the steam existed after making separation for simple atmosphere flash-off start-up system in the prior art is discharged into greatly
The loss of gas, working medium and heat is larger, and compound atmosphere flash-off start-up system is during startup by loss section division of labor matter and big
Partial heat, starting drainage heat exchanger activation system investment is high, and system structure is complicated, and recirculation pump activation system system is multiple
Miscellaneous, investment is high, and repair and maintenance is costly, and there are cavitation danger in recirculation pump, and dedicated pipeline is arranged and improves hydrophobic degree of supercooling,
Condenser type activation system does not lose working medium during startup, but loses most of heat, and hydrophobic treatment is improper often to draw
Former thermally equilibrated destruction in condenser is played, causes back pressure to increase, influences unit output, can also cause shock and vibration, condenser pipe broken
The problems such as damage, shell are drawn up, still shortage effective solution scheme.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of, and the nothing based on high-low pressure hydrophobic development unit opens
Dynamic circulating pump Once-through Boiler drained water recovery system and method can be returned using high pressure draining flash vessel and low pressure hydrophobic development unit
Hydrophobic and heat during receiving unit starting and in normal course of operation shortens the starting time of boiler, saves water resource, saves
Fuel consumption in start-up course.
The technical scheme adopted by the invention is that：
There is provided a kind of Once-through Boiler drained water recovery systems based on high-low pressure hydrophobic development unit for an object of the present disclosure, should
System includes separator, separator water storage tank, high pressure draining flash vessel, low pressure hydrophobic development unit, oxygen-eliminating device, condenser, unit
Rhone, other steam user and starting drainage pump；
The hydrophobic of the separator enters high pressure draining flash vessel by separator water storage tank；
Three steam (vapor) outlets of the high pressure draining flash vessel pass through pipeline and oxygen-eliminating device, other steam user and low respectively
Hydrophobic development unit connection is pressed, the steam in high pressure draining flash vessel is delivered to oxygen-eliminating device and other steam user carries out heat and returns
It receives, extra discharge of steam to low pressure hydrophobic development unit is arranged by exhaust pipe to atmosphere；
The hydrophobic outlet of three of the high pressure draining flash vessel is hydrophobic by pipeline and oxygen-eliminating device, condenser and low pressure respectively
Drain discharge to oxygen-eliminating device is according to circumstances carried out heat recovery, or by drain discharge when water quality qualification by flash vessel connection
The recycling of working medium is carried out to condenser；When water quality is unqualified, by drain discharge into low pressure hydrophobic development unit, dredged by starting
Water pump is emitted into unit rhone.
Further, shut-off valve is disposed on the pipeline that the separator water storage tank is connect with high pressure draining flash vessel
And level control valve.
Further, adjusting is provided on the pipeline that the steam (vapor) outlet one of the high pressure draining flash vessel is connect with oxygen-eliminating device
Valve one enters the steam flow of oxygen-eliminating device by the control of regulating valve one；
Regulating valve is provided on the pipeline that the steam (vapor) outlet two of the high pressure draining flash vessel is connect with other steam user
Two, the steam flow of other steam user is entered by the control of regulating valve two；
Adjusting is provided on the pipeline that the steam (vapor) outlet three of the high pressure draining flash vessel is connect with low pressure hydrophobic development unit
Valve three；
After regulating valve one and regulating valve two are adjusted in place, if the pressure in high pressure draining flash vessel continues to increase close to peace
Excess steam in high pressure draining flash vessel is then emitted into low pressure hydrophobic development unit by regulating valve three by full valve release pressure, into
The steam for entering low pressure hydrophobic development unit is arranged by exhaust pipe to atmosphere.
Further, on the pipeline that the steam (vapor) outlet one of the high pressure draining flash vessel is connect with oxygen-eliminating device, the high pressure
Go out on the pipeline that the steam (vapor) outlet two of hydrophobic development unit is connect with other steam user with the steam of the high pressure draining flash vessel
Shut-off valve is also respectively provided on the pipelines that mouth three is connect with low pressure hydrophobic development unit.
Further, adjusting is provided on the pipeline that the hydrophobic outlet one of the high pressure draining flash vessel is connect with oxygen-eliminating device
High pressure draining flash vessel internal drainage is delivered to oxygen-eliminating device by regulating valve four by valve four；
It is provided with regulating valve five on the pipeline that the hydrophobic outlet two of the high pressure draining flash vessel is connect with condenser, is passed through
Regulating valve five is by the extra drain discharge of high pressure draining flash vessel to condenser；
Adjusting is provided on the pipeline that the hydrophobic outlet three of the high pressure draining flash vessel is connect with low pressure hydrophobic development unit
Valve six, when water quality is poor, closing regulating valve four and regulating valve five open regulating valve six, and high pressure draining flash vessel internal drainage is complete
Portion is emitted into low pressure hydrophobic development unit, and is emitted into unit rhone by starting drainage pump.
Further, the two sides of the regulating valve four and regulating valve six are respectively equipped with shut-off valve, and the one of the regulating valve five
Side is provided with shut-off valve, and the other side is provided with vacuum shut-off valve.
Further, on the pipeline that the steam (vapor) outlet one of the high pressure draining flash vessel is connect with oxygen-eliminating device, the high pressure
On the pipeline that the steam (vapor) outlet two of hydrophobic development unit is connect with other steam user, start what drainage pump was connect with unit rhone
Check-valves is also respectively provided on pipeline and on the pipeline that connect with oxygen-eliminating device of starting drainage pump.
There is provided a kind of Once-through Boilers as described above based on high-low pressure hydrophobic development unit to dredge for the second object of the present invention
The working method of water reclamation system, this approach includes the following steps：
The hydrophobic of separator flow to high pressure draining flash vessel through separator water storage tank；
When the quantity of steam generated in high pressure draining flash vessel is less than the steam demand amount of oxygen-eliminating device, keep regulating valve one complete
Open, if the pressure in high pressure draining flash vessel is higher than the pressure in oxygen-eliminating device, the steam generated in high pressure draining flash vessel into
Enter oxygen-eliminating device, heated to the water supply in oxygen-eliminating device, realizes heat recovery；
When the quantity of steam generated in high pressure draining flash vessel is higher than the steam demand amount of oxygen-eliminating device and is less than the steaming of oxygen-eliminating device
When vapour demand and the sum of the steam demand amount of other steam users, regulating valve two is gradually opened, extra steam is led to it
He is steam user；
When the quantity of steam generated in high pressure draining flash vessel is higher than the steam demand amount of oxygen-eliminating device with other steam users'
When the sum of steam demand amount, regulating valve three is gradually opened, extra steam is led into low pressure hydrophobic development unit, is arranged by exhaust pipe
To atmosphere；
Meanwhile the water level in high pressure draining flash vessel is controlled by regulating valve five, by drain recovery to condenser, realize work
The recycling of matter.
Further, hydrophobic to enter low pressure hydrophobic development unit by regulating valve six when water quality is unqualified, it is activated hydrophobic
Pump, check-valves four are emitted into unit rhone, clean to boiler；It when water quality qualification, is recycled to hydrophobic, closes and adjust
Valve six is saved, regulating valve five is opened, is discharged into condenser for hydrophobic.
Further, when unit reaches DC load or more, less drain discharge to high pressure hydrophobic development unit will be adjusted
One branch of valve, two branch of regulating valve, four branch of regulating valve, five branch of regulating valve are all closed, and all is hydrophobic thin by starting
Water pump is emitted into oxygen-eliminating device, carries out the recycling of part working medium and heat；Or；
One branch of regulating valve, two branch of regulating valve, four branch of regulating valve, six branch of regulating valve are all closed, it is hydrophobic complete
Portion is recycled to condenser, then recycles whole working medium without recycling heat.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention is separated hydrophobic with steam using high pressure draining flash vessel, is controlled by regulating valve by discharge of steam
Heat recovery is carried out to oxygen-eliminating device, is controlled by regulating valve and drain discharge is subjected to working medium recycling into condenser, greatly reduced
The loss of working medium and heat during startup while realizing recycling working medium and heat, neither influences the safety of unit operation
Property and economy, do not increase too many initial cost and operation expense yet；
(2) present invention had both met cold conditions cleaning and heat during unit starting in the case where Once-through Boiler is without starting circulating pump
A large amount of drain discharges fall to accelerate the requirement of unit cleaning speed when water quality is unqualified in state cleaning process, also meet and close in water quality
Working medium and heat are recycled to greatest extent when lattice；
(3) if steam user demand amount is sufficiently large, may be implemented in water quality qualification working medium whole recycling and
The recycling of most of heat to reduce the unit rate of water make-up and fuel consumption during starting, and reduces starting trouble
Capacity configuration, overall system structure of the present invention is simple, reduces investment outlay and takes up an area.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is simple atmosphere flash-off start-up system structure chart；
Fig. 2 is compound atmosphere flash-off start-up system structure chart；
Fig. 3 is starting drainage heat exchanger activation system structure chart；
Fig. 4 (a) and Fig. 4 (b) is recirculation pump activation system structure chart；
Fig. 5 is condenser type activation system structure chart；
Fig. 6 be it is proposed by the present invention based on high-low pressure hydrophobic development unit without starting circulating pump Once-through Boiler drained water recovery system
Structure chart；
Wherein, 1, separator, 2, separator water storage tank, 3, high pressure draining flash vessel, 4, low pressure hydrophobic development unit, 5, deoxygenation
Device, 6, condenser, 7, unit rhone, 8, other steam user, 9, starting drainage pump, 10, shut-off valve, 11, level control valve,
12, regulating valve one, 13, check-valves, 14, regulating valve two, 15, check-valves two, 16, regulating valve four, 17, check-valves three, 18, adjusting
Valve five, 19, vacuum shut-off valve, 20, regulating valve three, 21, regulating valve six, 22, check-valves three, 23, check-valves four, 24, auxiliary steaming
Vapour system.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
It is as shown in Figure 1 simple atmosphere flash-off start-up system as background technique is introduced, boiler startup process
In, the hydrophobic saturated vapor after air suspended type flash vessel dilatation of starting separator discharge is discharged into atmosphere, is saturated hydrophobic into hydrophobic
Case drains into recirculated water return water by delivery pump when water quality is unqualified, drains into condenser by delivery pump when water quality qualification.The starting
System initial investment is lower, but the steam after separation is discharged into atmosphere, and the loss of working medium and heat is larger.
It is illustrated in figure 2 compound atmosphere flash-off start-up system, during boiler startup, starts hydrophobic one in separator
Part saturated vapor after air suspended type flash vessel dilatation is discharged into atmosphere, be saturated it is hydrophobic enter drain tank, by defeated when water quality qualification
Pump is sent to drain into condenser.Input oxygen-eliminating device recycles working medium and heat after starting the amphiphilicity decompression in separator.Due to
Separator outlet pressure is more than 8MPa (g), and the design pressure 1.2MPa (g) of oxygen-eliminating device before entering DC load, is started
It is hydrophobic enter oxygen-eliminating device when, since pressure drop can generate huge kinetic energy impact and damage element in oxygen-eliminating device, and be accompanied by
The underwater injection noise of steam of nearly 100dB (A), there are potential dangers for recycling working medium.Noise elimination energy dissipating is installed additional although having at present
Correlative study experiment, but noise is still in the left and right 80dB (A).And oxygen-eliminating device recycling ability is limited, significant portion of working medium recycling
Or by air suspended type flash vessel, so during startup by loss section division of labor matter and most of heat.
It is illustrated in figure 3 and starts drainage heat exchanger activation system, during boiler startup, what starting separator generated is dredged
Water is hydrophobic when water quality qualification through boiler body hydrophobic development unit steam discharge decompression heel row to speciality of hydroelectric power engineering construction when water quality is unqualified
It is exchanged heat by the starting drainage heat exchanger of economizer entrance with boiler feedwater, recycles heat, improve feed temperature.And it drops
Hydrophobic after temperature drop pressure can be discharged into oxygen-eliminating device comparatively safely, when the receiving amount or accident conditions for being more than oxygen-eliminating device, through spraying water
Condenser is discharged into after desuperheat.Start hydrophobic heat and obtain cascade utilization, do not lose working medium and heat, but invests high, system knot
Structure is complicated.
If Fig. 4 (a) and Fig. 4 (b) show recirculation pump activation system, according to the side of connection of recirculation pump and feed pump
Formula, and series and parallel type can be divided into.Recirculation pump flow a part carrys out the referred to as tandem activation system of self-water-supply, then follows
Ring pump discharge all is from the referred to as parallel activation system of starting separator.During boiler startup, steam-water separator is produced
Raw is hydrophobic, when water quality is unqualified, through boiler body hydrophobic development unit steam discharge decompression heel row to speciality of hydroelectric power engineering construction, when water quality qualification
When, hydrophobic recycled pump reenters economizer entrance.The system has the starting time short, and it is excellent not lose working medium and heat etc.
Point, but system complex, investment is high, and repair and maintenance is costly.There are cavitation danger in recirculation pump, dedicated pipeline is set and is mentioned
High hydrophobic degree of supercooling.
Be illustrated in figure 5 condenser type activation system, start it is hydrophobic caused by separator, when water quality is unqualified, warp
Boiler body hydrophobic development unit steam discharge decompression heel row is hydrophobic all to arrange after pressure and temperature reducing when water quality qualification to speciality of hydroelectric power engineering construction
Enter condenser, accident conditions are discharged into water conservancy project recirculated water return water.The activation system does not lose working medium during startup, but loses big
Partial heat.Hydrophobic treatment is improper often to cause former thermally equilibrated destruction in condenser, causes back pressure to increase, influences unit and go out
Power can also cause the problems such as shock and vibration, condenser pipe are damaged, shell is drawn up.
Because there is the above problem in actual operation in current activation system, in order to realize recycling working medium and heat
While amount, the neither safety and economy of influence unit operation does not increase too many initial cost and operation expense yet
Purpose, the invention proposes one kind can shorten the boiler startup time, save water resource, save fuel, reduce operation and maintenance at
This without starting circulating pump Once-through Boiler drained water recovery system and method.
Embodiment 1：
In a kind of typical embodiment of the application, as shown in Figure 1, providing a kind of based on high-low pressure hydrophobic development unit
Without starting circulating pump Once-through Boiler drained water recovery system, which includes separator 1, separator water storage tank 2, high pressure draining dilatation
Device 3, low pressure hydrophobic development unit 4, oxygen-eliminating device 5, condenser 6, unit rhone 7 and other steam user 8；The high pressure draining expands
Container 3 and low pressure hydrophobic development unit 4 are the overall structure of hydrophobic development unit and water tank.
The separator 1 is connect with separator water storage tank 2, and the separator water storage tank 2 connects with high pressure draining flash vessel 3
It connects, the pressure of high pressure draining flash vessel 3 is between starting 1 pressure of separator and 5 pressure of oxygen-eliminating device, slightly above oxygen-eliminating device 5
Pressure, operating pressure are adjusted according to oxygen-eliminating device 5 and with the pressure of other steam user 8；Low pressure hydrophobic development unit 4
Pressure is between high pressure draining flash vessel 3 and atmospheric pressure, and slightly above atmospheric pressure belongs to air suspended type flash vessel.
Shut-off valve 10 and level control valve are provided on the pipeline that separator water storage tank 2 is connect with high pressure draining flash vessel 3
11, the high temperature and pressure water of boiler startup separator water storage tank enters high pressure draining flash vessel 3.
There are three steam (vapor) outlet, the steam (vapor) outlets one of high pressure draining flash vessel 3 to pass through pipeline and remove for high pressure draining flash vessel 3
Oxygen device 5 connects, and shut-off valve is disposed on the pipeline that the steam (vapor) outlet one of high pressure draining flash vessel 3 is connect with oxygen-eliminating device 5, is adjusted
Save valve 1 and check-valves 1；The steam (vapor) outlet two-way piping of high pressure draining flash vessel 3 is connect with other steam user 8,
Shut-off valve, regulating valve are disposed on the pipeline that the steam (vapor) outlet two of high pressure draining flash vessel 3 is connect with other steam user 8
2 14 and check-valves 2 15；The steam (vapor) outlet threeway piping of high pressure draining flash vessel 3 is connect with low pressure hydrophobic development unit 4, high
Be disposed on the pipeline that is connect with low pressure hydrophobic development unit 4 of steam (vapor) outlet three of pressure hydrophobic development unit 3 regulating valve 3 20 and
Positioned at the shut-off valve for having 3 20 two sides of regulating valve.
The design pressure of high pressure draining flash vessel 3 about 1.2MPa~1.4MPa, by the adjusting pressure that safety valve is rationally arranged
Power ensures its not superpressure.The pressure of high pressure draining flash vessel 3 is common by regulating valve 1, regulating valve 2 14 and regulating valve 3 20
Control, wherein mainly control is into the steam flow of oxygen-eliminating device 5 for regulating valve 1, and mainly control enters other steamings to regulating valve 2 14
The steam flow of vapour user 8, after regulating valve 1 and regulating valve 2 14 are adjusted in place, if in high pressure draining flash vessel 3
Pressure continues to increase then to be emitted into the excess steam that system can not consume by regulating valve 3 20 close to safety valve jumping up pressure
Low pressure hydrophobic development unit 4, to guarantee that the pressure in high pressure draining flash vessel 3 is not up to safety valve jumping up pressure.
There are three hydrophobic outlet, the hydrophobic outlets one of high pressure draining flash vessel 3 to pass through pipeline and remove for high pressure draining flash vessel 3
Oxygen device connects, and is provided with regulating valve 4 16, two on the pipeline that the hydrophobic outlet one of high pressure draining flash vessel 3 is connect with oxygen-eliminating device
Shut-off valve and check-valves 3 17 positioned at four two sides of regulating valve, the oxygen-eliminating device are also connected with Auxiliary Steam；High pressure draining
The hydrophobic outlet two-way piping of flash vessel 3 is connect with condenser, and the hydrophobic outlet two of high pressure draining flash vessel 3 and condenser connect
Be provided on the pipeline connect shut-off valve, regulating valve 5 18 and with vacuum shut-off valve 19；The hydrophobic outlet three of high pressure draining flash vessel 3
It is connect by pipeline with low pressure hydrophobic development unit 4, the hydrophobic outlet three of high pressure draining flash vessel 3 and low pressure hydrophobic development unit 4 connect
Regulating valve 6 21 and two shut-off valves positioned at six two sides of regulating valve, the low pressure hydrophobic development unit 4 are provided on the pipeline connect
It is also connect respectively with unit rhone 7 and oxygen-eliminating device 5 by starting drainage pump 9, starting drainage pump 9 is connect with unit rhone 7
Pipeline on be provided with check-valves 3 22, be provided with check-valves 4 23 on the pipeline that starting drainage pump 9 is connect with oxygen-eliminating device 5.
The water level of high pressure draining flash vessel 3 is by 6 21 co- controlling of regulating valve 4 16, regulating valve 5 18 and regulating valve.When removing
When the heating that oxygen device 5 is not able to satisfy oxygen-eliminating device 5 only by adusting valve 1 into vapour requires, the water level of high pressure draining flash vessel 3 is such as
Fruit is increased to the numerical value of setting, then opens the shut-off valve of 4 16 front and back of regulating valve, and gradually opens big regulating valve 4 16 to oxygen-eliminating device 5
It is hydrophobic, if water temperature cannot still reach requirement, Auxiliary Steam 24 is needed to provide heating steam to oxygen-eliminating device 5.Regulating valve
After 4 16 adjustment, by 5 18 branch of regulating valve by extra drain discharge to condenser 6.When water quality is poor, need out
It when beginning to discharge, then needs to close 5 18 branch of 4 16 branch of regulating valve and regulating valve, opens 6 21 branch of regulating valve, it will be hydrophobic complete
Portion is emitted into low pressure hydrophobic development unit 4, and is emitted into unit rhone 7 by starting drainage pump 9.
Low pressure hydrophobic development unit 4 receives steam and hydrophobic, the steaming come out if there is dilatation from high pressure draining flash vessel 3
Vapour is then emitted into atmosphere by blow-off line, and the water level of low pressure hydrophobic development unit 4 is discharged by starting drainage pump 9, works as water
When matter qualification, it is emitted into oxygen-eliminating device 5, unit rhone 7 is emitted into when water quality is unqualified.
The embodiment of the present invention proposes a kind of recycling without starting based on high pressure draining flash vessel and low pressure hydrophobic development unit
Once-through Boiler drained water recovery system is pumped, in the case where Once-through Boiler is without starting circulating pump, cold conditions was cleaned during both having met unit starting
Fall with drain discharges a large amount of when water quality is unqualified in hot cleaning process to accelerate the requirement of unit cleaning speed, also meets in water
Working medium and heat are recycled to greatest extent when matter qualification；It, can in water quality qualification if steam user demand amount is sufficiently large
To realize whole recycling of working medium and the recycling of most of heat, to reduce the unit rate of water make-up during starting and combustion
Expect consumption, and reduces the capacity configuration of starting trouble, reduce investment outlay and take up an area.
As shown in fig. 6, the nothing based on high pressure draining flash vessel and low pressure hydrophobic development unit that the embodiment of the present invention proposes opens
Dynamic circulating pump Once-through Boiler drained water recovery system in use, separator 1 the hydrophobic pass exported through separator water storage tank 2, water storage tank
Disconnected valve 10, water storage tank level control valve 11 to high pressure hydrophobic development unit 3；The steam of high pressure draining flash vessel 3 is through regulating valve one
12 and check-valves 1 to oxygen-eliminating device 5；The steam of high pressure draining flash vessel 3 is through regulating valve 2 14 and check-valves 2 15 to other steamings
Vapour user 8；The steam of high pressure draining flash vessel 3 is through regulating valve 3 20 to low pressure hydrophobic development unit 4；High pressure draining flash vessel 3
It is hydrophobic through regulating valve 4 16 and check-valves 3 17 to oxygen-eliminating device 5；High pressure draining flash vessel 3 it is hydrophobic through regulating valve 6 21 to low pressure
Hydrophobic development unit 4；High pressure draining flash vessel 3 it is hydrophobic through regulating valve 5 18 and vacuum shut-off valve 19 to condenser 6；Low pressure is hydrophobic
Hydrophobic activated drainage pump 9, the check-valves 4 23 to oxygen-eliminating device 5 of flash vessel 4；Low pressure hydrophobic development unit 4 it is hydrophobic it is activated dredge
Water pump 9, check-valves 3 22 to unit rhone 7.
Embodiment 2：
By taking unit cold start as an example, to the proposition of embodiment 1 based on high pressure draining flash vessel and low pressure hydrophobic development unit
Without starting circulating pump Once-through Boiler drained water recovery system the method for operation be described in detail it is as follows：
At unit starting initial stage, before igniting, need to carry out cold conditions cleaning, after the completion of upper water, boiler carries out cold conditions cleaning, gives
Water is through economizer, furnace wall cooling, water cooling wall outlet mixing header, separator 1 and separator water storage tank 2, then through hydrophobic water
Position regulating valve 11 drains into high pressure draining flash vessel 3, hydrophobic if separator water storage tank goes out in saliva iron-content and is greater than 1000 μ g/L
Entering low pressure hydrophobic development unit 4 by regulating valve 6 21, activated drainage pump 9, check-valves 4 22 are emitted into unit rhone 7,
It when iron-content is less than 1000 μ g/L in water, is recycled to hydrophobic, closes 6 21 branch of regulating valve, open regulating valve 5 18
Road is discharged into condenser 6 through regulating valve 5 18 and vacuum shut-off valve 19 for hydrophobic.Cold conditions wash cycles proceed to separator water storage tank
Out in saliva iron-content less than 200 μ g/L when terminate.
After cold conditions is cleaned, feed pump flow enhancement to 30%BMCR establishes water circulation, is performing every preparation
Afterwards, ignition of the boiler.Water into separator 1 is gradually changed into saturated water by subcooled water, and temperature and pressure gradually rises, and is passing through
After the of short duration carbonated drink expansion stage, continue according to cold start curve increasing temperature and pressure, gradually have therebetween steam from separator 1 into
Enter superheater, while the saturated water entered in separator water storage tank 2 gradually decreases accordingly, until main steam flow reaches 30%
BMCR or so, for pressure in 11MPa or so, unit switchs to DC operation mode, into all steam in separator 1, and
Enter separator water storage tank 2 there is no hydrophobic.Therebetween according to water quality situation, at 190 DEG C or so of 1 inlet temperature of separator, also
Need to carry out hot cleaning, steam turbine red switch and the programs such as grid-connected have also been completed before reaching DC load, because with hydrophobic time
Receipts relationship is little, and and will not be described here in detail.
The saturated water temperature and pressure that analyzing this process can be seen that into high pressure draining flash vessel 3 gradually rises, flow
It gradually decreases, that is, the heat entered in high pressure draining flash vessel 3 will undergo one first to increase the process reduced again, and high pressure draining expands
The quantity of steam generated in container 3 first gradually rises, then is gradually decrease to zero, generated in high pressure draining flash vessel 3 it is hydrophobic then by
Gradually it is reduced to zero.It is found after proceeding through preresearch estimates according to the start up curve of certain unit and heat balance diagram, high pressure draining dilatation
The quantity of steam of quantity of steam and other steam users needs that steam production in device 3 is needed in peak value higher than the heating of oxygen-eliminating device 5,
Within a period of time before igniting initial start stage and entrance DC load, the quantity of steam generated in high pressure draining flash vessel 3 cannot
Meet the demand for heat of oxygen-eliminating device 5.Accordingly, to entirely following without starting based on high pressure draining flash vessel and low pressure hydrophobic development unit
Ring pumps the method for operation of the Once-through Boiler drained water recovery system in starting and normal operation, and detailed description are as follows：
It is assumed that before activation, following without starting based on high pressure draining flash vessel and low pressure hydrophobic development unit as shown in FIG. 6
Ring pumps in Once-through Boiler drained water recovery system in addition to the hydrophobic shut-off valve 10 of separator water storage tank and the water level tune of separator water storage tank
Section valve 11 opens outer, other valves all closings.
1, the regulating valve 1 when the quantity of steam generated in high pressure draining flash vessel 3 is less than the steam demand amount of oxygen-eliminating device 5
Keep standard-sized sheet；If the pressure in high pressure draining flash vessel 3 is lower than the pressure in oxygen-eliminating device 5, high pressure draining flash vessel 3 at this time
In " building the pressure " state, no steam output, the heating of oxygen-eliminating device 5 at this time is all by the vapour of other Auxiliary Steams 24
Source.
If water quality hydrophobic at this time is bad, regulating valve 6 21 is opened, high pressure draining dilatation is adjusted by regulating valve 6 21
Water level in device 3, hydrophobic that low pressure hydrophobic development unit 4 is entered by 6 21 branch of regulating valve, hydrophobic after dilatation, discharge of steam
It is hydrophobic to be emitted into unit rhone 7 by starting drainage pump 9 into atmosphere, accelerate the cleaning of boiler.Do not have recycling work at this time
The condition of matter and heat.If water quality is preferable, 6 21 branch of regulating valve is closed, 5 18 branch of regulating valve is opened, by hydrophobic time
It receives to condenser 6, the recycling of working medium is realized in the case where not consuming electric energy.
If the pressure in high pressure draining flash vessel 3 is higher than the pressure in oxygen-eliminating device at this time, high pressure draining flash vessel 3 is produced
Raw steam can enter oxygen-eliminating device 5, start the recycling for realizing heat.Water supply in oxygen-eliminating device 5 is heated by high pressure draining dilatation
The vapour source of steam and other Auxiliary Steams 24 that device 3 generates is completed jointly.It is controlled at this time by 5 18 branch of regulating valve
Water level in high pressure draining flash vessel 3 processed, and by drain recovery to condenser 6.
2, when the quantity of steam generated in high pressure draining flash vessel 3 is higher than the steam demand amount of oxygen-eliminating device 5 and is less than oxygen-eliminating device 5
Steam demand amount and other steam users the sum of steam demand amount when, gradually open regulating valve 2 14, by extra steam
Other steam user 8 is led to, guarantees that the pressure in high pressure draining flash vessel 3 is no more than safety valve jumping up by regulating valve 2 14
Pressure.Control the water level in high pressure draining flash vessel 3 by 2 18 branch of regulating valve at this time, and by drain recovery to condenser
6。
Under this operating condition, if the pressure in high pressure draining flash vessel 3 is higher, it can attempt to be gradually opened regulating valve 4 16,
The recycling that part drain discharge to oxygen-eliminating device 5 is carried out to heat by the pressure in high pressure draining flash vessel 3, needs to pass through at this time
Regulating valve 1 is adjusted to reduce the throttle flow of oxygen-eliminating device.
3, when the quantity of steam generated in high pressure draining flash vessel 3 is higher than the steam demand amount of oxygen-eliminating device 5 and other steam are used
When the sum of the steam demand amount at family, regulating valve 3 20 is gradually opened, extra steam is led into low pressure hydrophobic development unit 4, is passed through
Regulating valve 3 20 come guarantee the pressure in high pressure draining flash vessel 3 be no more than safety valve jumping up pressure.Into low pressure dewatering capacity-enlarging
The steam of device can only be arranged by exhaust pipe to atmosphere.Through calculating, it is only less in other auxiliary steam user dosages and enter high pressure
In the presence of steam discharge in short-term when heat in hydrophobic development unit 3 is in peak value section.It is controlled at this time by 5 18 branch of regulating valve
Water level in high pressure draining flash vessel 3, and by drain recovery to condenser 6.
4, when unit reaches DC load or more, the hydrophobic amount of the operating condition is less, and more such as boiler sootblowing steam is hydrophobic
Etc. regular drain discharge to high pressure hydrophobic development unit 3.There are two types of selections at this time：One, one 12 branch of regulating valve, regulating valve 2 14
Road, 4 16 branch of regulating valve, regulating valve 5 18 branch are all closed, all hydrophobic to be emitted into deoxygenation by starting drainage pump 9
Device 5 carries out the recycling of part working medium and heat；Two, one 12 branch of regulating valve, 2 14 branch of regulating valve, 4 16 branch of regulating valve,
6 21 branch of regulating valve is all closed, and hydrophobic whole is recycled to condenser 6, then recycles whole working medium without recycling heat.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of Once-through Boiler drained water recovery system based on high-low pressure hydrophobic development unit, characterized in that including separator, separator
Water storage tank, high pressure draining flash vessel, low pressure hydrophobic development unit, oxygen-eliminating device, condenser, unit rhone, other steam user and
Start drainage pump；
The hydrophobic of the separator enters high pressure draining flash vessel by separator water storage tank；
Three steam (vapor) outlets of the high pressure draining flash vessel pass through pipeline respectively and oxygen-eliminating device, other steam user and low pressure are dredged
Steam in high pressure draining flash vessel is delivered to oxygen-eliminating device and other steam user carries out heat recovery by the connection of water flash vessel,
By extra discharge of steam to low pressure hydrophobic development unit, arranged by exhaust pipe to atmosphere；
The hydrophobic outlet of three of the high pressure draining flash vessel passes through pipeline and oxygen-eliminating device, condenser and low pressure dewatering capacity-enlarging respectively
Drain discharge to oxygen-eliminating device is according to circumstances carried out heat recovery when water quality qualification by device connection, or by drain discharge to solidifying
The recycling of vapour device progress working medium；When water quality is unqualified, by drain discharge into low pressure hydrophobic development unit, by starting drainage pump
It is emitted into unit rhone.
2. the Once-through Boiler drained water recovery system according to claim 1 based on high-low pressure hydrophobic development unit, characterized in that institute
It states and is disposed with shut-off valve and level control valve on the pipeline that separator water storage tank is connect with high pressure draining flash vessel.
3. the Once-through Boiler drained water recovery system according to claim 1 based on high-low pressure hydrophobic development unit, characterized in that institute
It states and is provided with regulating valve one on the pipeline that the steam (vapor) outlet one of high pressure draining flash vessel is connect with oxygen-eliminating device, controlled by regulating valve one
System enters the steam flow of oxygen-eliminating device；
It is provided with regulating valve two on the pipeline that the steam (vapor) outlet two of the high pressure draining flash vessel is connect with other steam user, is led to
Overregulate the steam flow that the control of valve two enters other steam user；
Regulating valve three is provided on the pipeline that the steam (vapor) outlet three of the high pressure draining flash vessel is connect with low pressure hydrophobic development unit；
After regulating valve one and regulating valve two are adjusted in place, if the pressure in high pressure draining flash vessel continues to increase close to safety valve
Excess steam in high pressure draining flash vessel is then emitted into low pressure hydrophobic development unit by regulating valve three by release pressure, and entrance is low
The steam of pressure hydrophobic development unit is arranged by exhaust pipe to atmosphere.
4. the Once-through Boiler drained water recovery system according to claim 3 based on high-low pressure hydrophobic development unit, characterized in that institute
It states on the pipeline that the steam (vapor) outlet one of high pressure draining flash vessel is connect with oxygen-eliminating device, the steam (vapor) outlet of the high pressure draining flash vessel
On two pipelines being connect with other steam user and the steam (vapor) outlet three of the high pressure draining flash vessel and low pressure hydrophobic development unit
Shut-off valve is also respectively provided on the pipeline of connection.
5. the Once-through Boiler drained water recovery system according to claim 1 based on high-low pressure hydrophobic development unit, characterized in that institute
It states and is provided with regulating valve four on the pipeline that the hydrophobic outlet one of high pressure draining flash vessel is connect with oxygen-eliminating device, passing through regulating valve four will
High pressure draining flash vessel internal drainage is delivered to oxygen-eliminating device；
It is provided with regulating valve five on the pipeline that the hydrophobic outlet two of the high pressure draining flash vessel is connect with condenser, passes through adjusting
Valve five is by the extra drain discharge of high pressure draining flash vessel to condenser；
It is provided with regulating valve six on the pipeline that the hydrophobic outlet three of the high pressure draining flash vessel is connect with low pressure hydrophobic development unit,
When water quality is poor, closing regulating valve four and regulating valve five open regulating valve six, and high pressure draining flash vessel internal drainage is all discharged
Unit rhone is emitted into low pressure hydrophobic development unit, and by starting drainage pump.
6. the Once-through Boiler drained water recovery system according to claim 5 based on high-low pressure hydrophobic development unit, characterized in that institute
The two sides for stating regulating valve four and regulating valve six are respectively equipped with shut-off valve, and the side of the regulating valve five is provided with shut-off valve, another
Side is provided with vacuum shut-off valve.
7. based on the Once-through Boiler drained water recovery system of high-low pressure hydrophobic development unit, feature according to claim 3 or 5
It is, on the pipeline that the steam (vapor) outlet one of the high pressure draining flash vessel is connect with oxygen-eliminating device, the steaming of the high pressure draining flash vessel
On the pipeline that vapor outlet two is connect with other steam user, starts on the pipeline that drainage pump is connect with unit rhone and start
Check-valves is also respectively provided on the pipeline that drainage pump is connect with oxygen-eliminating device.
8. a kind of such as the Once-through Boiler drained water recovery system of any of claims 1-7 based on high-low pressure hydrophobic development unit
Working method, characterized in that include the following steps：
The hydrophobic of separator flow to high pressure draining flash vessel through separator water storage tank；
When the quantity of steam generated in high pressure draining flash vessel is less than the steam demand amount of oxygen-eliminating device, one standard-sized sheet of regulating valve is kept,
If the pressure in high pressure draining flash vessel is higher than the pressure in oxygen-eliminating device, the steam generated in high pressure draining flash vessel, which enters, to be removed
Oxygen device is heated to the water supply in oxygen-eliminating device, realizes heat recovery；
When the quantity of steam generated in high pressure draining flash vessel is higher than the steam demand amount of oxygen-eliminating device and needs less than the steam of oxygen-eliminating device
When the amount of asking and the sum of the steam demand amount of other steam users, regulating valve two is gradually opened, extra steam is led into other steamings
Vapour user；
It is higher than the steam demand amount of oxygen-eliminating device and the steam of other steam users when the quantity of steam generated in high pressure draining flash vessel
When the sum of demand, regulating valve three is gradually opened, extra steam is led into low pressure hydrophobic development unit, is arranged by exhaust pipe to big
Gas；
Meanwhile the water level in high pressure draining flash vessel is controlled by regulating valve five, drain recovery to condenser is realized into working medium
Recycling.
9. according to the method described in claim 8, it is characterized in that, when water quality is unqualified, it is hydrophobic by regulating valve six enter it is low
Hydrophobic development unit is pressed, activated drainage pump, check-valves four are emitted into unit rhone, clean to boiler；When water quality qualification
When, it is recycled to hydrophobic, closes regulating valve six, opened regulating valve five, be discharged into condenser for hydrophobic.
10. according to the method described in claim 8, it is characterized in that, when unit reaches DC load or more, less drain discharge
To high pressure hydrophobic development unit, one branch of regulating valve, two branch of regulating valve, four branch of regulating valve, five branch of regulating valve are all closed
Close, it is all it is hydrophobic be emitted into oxygen-eliminating device by starting drainage pump, carry out the recycling of part working medium and heat；Or；
One branch of regulating valve, two branch of regulating valve, four branch of regulating valve, six branch of regulating valve are all closed, hydrophobic whole is returned
It receives to condenser, then recycles whole working medium without recycling heat.
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