CN205717153U - A kind of Start-up Systems for Direct-through Boilers - Google Patents
A kind of Start-up Systems for Direct-through Boilers Download PDFInfo
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- CN205717153U CN205717153U CN201620668842.9U CN201620668842U CN205717153U CN 205717153 U CN205717153 U CN 205717153U CN 201620668842 U CN201620668842 U CN 201620668842U CN 205717153 U CN205717153 U CN 205717153U
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Abstract
The utility model discloses a kind of Start-up Systems for Direct-through Boilers, this system includes separator storage tank, pressure flash vessel, high-pressure heater, oxygen-eliminating device, boiler side auxiliary vapour header, steam turbine side auxiliary vapour header, boiler reheater and unit rhone；Wherein, the outlet of separator storage tank connects the entrance of pressure flash vessel, and pressure flash vessel has two-way steam (vapor) outlet, and road row's air, a road is discharged into high-pressure heater vapour side.Pressure flash vessel has two path water to export, and a road is discharged into oxygen-eliminating device, and a road is discharged into unit rhone.From boiler reheater to boiler side auxiliary vapour header steam supply, boiler side auxiliary vapour header and steam turbine Ce Fuqi header UNICOM.The method has reclaimed direct current cooker by pressure flash vessel and has started the hydrophobic water yield and heat, improves the temperature of boiler feedwater.By boiler reheater to boiler auxiliary vapour header steam supply, decrease the unit starting dependency to external steam, decrease the steam being discharged into condenser by bypass, have energy-conservation and cost-effective effect.
Description
Technical field:
This utility model belongs to technical field of electric power, is specifically related to a kind of Start-up Systems for Direct-through Boilers.
Background technology:
Power station unit needs a certain amount of steam in initial start stage and the stage of shutdown, and these steam seal mainly for axle, steam-operating
Feedwater mercury vapour source, oxygen-eliminating device heating, air preheater soot blowing, steam air heater etc..These steam are to be provided by adjacent machine or starting trouble at present
's.These steam provided by adjacent machine or starting trouble are referred to as external steam.External steam steam supply typically delivers to the auxiliary of the machine
Vapour header, the machine vapour is taken from auxiliary vapour header as required.
The auxiliary vapour header vapour source of conventional design is in addition to outside vapour source at present, also draws gas from unit four sections or cold section of reheater
Access vapour source.It is increased to sufficiently large (typically require four sections to draw gas or cold section of reheat steam pressure is more than 0.7Mpa) at unit load
After, the vapour source of auxiliary vapour header can switch to the machine vapour source from outside vapour source, and this process is referred to as the switching of vapour source.
From the machine ignition of the boiler to completing the switching of vapour source, properly functioning unit is it is generally required to the time of about at least 8 hours.
For new strong unit, ignition of the boiler tube blowing stage, airport logistic park stage, the initial stage in on-load stage are required for outside vapour source steam supply,
For test run than unit more smoothly, using the time in outside vapour source at least to need 150 hours, the ill unit of test run needs
Will the time can be longer.
Outside vapour source is from adjacent machine, and unit starting, stopped process need to be limited by adjacent machine on-load situation.Outside vapour source is come
Self-starting boiler, needs starting trouble with the operation of long period.Owing to starting trouble design is not longtime running, accordingly
Environmental protection facility is typically all without the most perfect, and in starting trouble running, damage ratio is more serious.Currently active boiler great majority are
Oil burning boiler, long-play expense is the highest.
The unit starting stage uses quantity of steam the biggest, for not having the unit of electrically driven feed pump, using steam-operating blower fan
Unit, Factory Building need the unit starting steam consumption of heating bigger, outside steam supply often can not meet requirement.Adjacent machine is used to supply
Vapour, if adjacent machine load is relatively low, using the teaching of the invention it is possible to provide quantity of steam and steam parameter be difficult to meet the demand of startup vapour.Use and start
Boiler steam supply, if starting trouble designs fully according to maximum vapour, can increase Construction of Unit expense.
During compressor emergency shutdown, outside vapour source is needed to recover supply.If accident situation is shut down suddenly, outside vapour source is not
(starting trouble startup requires time for, and adjacent machine steam supply heating coil requires time for), the vapour source meeting that after chaser, four sections are drawn gas can be supplied in time
Losing immediately, the vapour source of cold section of reheater is limited, and auxiliary vapour forfeiture can make accident expand further.Steam-driven induced draft fan, steam-operating feeds water
Pump can trip after losing vapour source, is again started up needing the long period, thus can extend the time that unit recovers to start again.
Electric station DC boiler, before state of becoming a cadre, starts separator and can separate a part of saturation water, these saturation waters
Being stored in the storage tank of separator, these water separated are referred to as direct current cooker and start hydrophobic.Currently active hydrophobic row
Go out and mainly have following several approach.
The first is to utilize boiler water circulating pump will start hydrophobic Water Sproading to boiler economizer entrance.This method is mainly deposited
In following deficiency:
(1) starting system in the course of the work, the working medium of boiler water circulating pump has higher temperature and pressure, circulates stove water
Pump prescription is higher, and the boiler water circulating pump of our domestic super (super-) critical boiler is mainly by import at present.Import stove water follows
Costly and the order cycle time is longer for ring pump, and current thermal power generation quickly grows, and the boiler water circulating pump supply of material tends not to meet
The needs of power plant construction.
(2) cooling water quality of boiler water circulating pump motor chamber requires the highest, all occurs due to motor in a lot of power plant
Chamber Inner filter net blocks, and causes boiler pump motor temperature high and shutdown maintenance of having to.
(3) boiler water circulating pump is the highest to the reliability requirement of cooling water, once occurs due to motor cavity in some power plant
Room cooling water is revealed, and the high-temperature water in stove enters boiler water circulating pump motor chamber so that boiler water circulating pump motor coil burns, no
Obtain not shutdown maintenance.
(4) maintenance of boiler water circulating pump is cumbersome.Owing to boiler water circulating pump is mainly by import, a lot of equipment suppliers carry
The maintenance condition gone out is harsher, and power plant is extremely difficult to overhaul requirement.Once there is power plant due to motor chamber filter net jam, and incite somebody to action
Factory's cleaning filter screen is returned in whole stove water pump air transport, lasts 1 month, and expense waste is huge.
Second method is to air flash vessel by startup drain discharge.This method is primarily present following deficiency:
(1) startup of direct current cooker is hydrophobic is saturated water under high pressure, and after air flash vessel dilatation, a part is by big
The steam discharge of gas flash vessel enters in the air, it is possible to a part of water of recovery can only be also the saturation water under normal pressure, cause the water yield and
The waste of heat.
(2) fall after entering aerial water recovery around in environment, surrounding is caused pollution.
(3) if the saturation water water quality in air flash vessel is qualified, need to be emitted in condenser, but owing to reclaiming water temperature
Degree height, after entering condenser, improves condensing water temperature, can reduce the efficiency of unit, the most also influence whether at condensate fine
The safe operation of reason.
(4) the water drainage pump to be passed through in air flash vessel is squeezed in condenser, adds investment.
(5) condenser is connected with air flash vessel, due to reasons such as valves leakages, have impact on condenser vacuum, reduces
The efficiency of unit operation, has even had influence on the safe operation of unit.
(6) air flash vessel is not to close, and the dust in air inevitably enters in air flash vessel, adds
Start hydrophobic secondary pollution.If the water polluted enters in condenser, therrmodynamic system will be polluted.
When power station starts, in the ignition of the boiler increasing temperature and pressure not yet red switch stage, the steam that boiler produces must be by bypass
Enter condenser.In red switch and low load stage, still there is some vapor to need by turbine by-pass and enter condenser.
Steam enters condenser and is primarily present following deficiency:
(1) entering the steam of condenser, its heat cannot be utilized, and is the waste of energy；
(2) steam enters condenser, improves the temperature condensing water, reduces the efficiency of steam turbine；
(3) condense water the too high operation that can affect precision processing of temperature, a lot of power plant all occurred initial start stage due to
Condensing water temperature is too high and makes the precision processing cannot bringing normally into operation；
After steam entrance condenser becomes condensation water, oxygen-eliminating device squeezed into by condensate pump to be utilized, and adds condensate pump
Wasted work.
Utility model content:
The purpose of this utility model is on the one hand to use external steam in a large number, additionally for the current unit starting stage
The problem that the steam of self unit generation and the saturation water of High Temperature High Pressure cannot use, it is provided that a kind of direct current cooker starts system
System.
For reaching above-mentioned purpose, this utility model adopts the following technical scheme that and realizes:
A kind of Start-up Systems for Direct-through Boilers, including separator storage tank, pressure flash vessel, high-pressure heater vapour side, deoxygenation
Device, boiler side auxiliary vapour header and unit rhone；Wherein,
The outlet of separator storage tank connects the entrance of pressure flash vessel, and the first outlet of pressure flash vessel connects air row
Putting valve, the second outlet of pressure flash vessel connects the first entrance of high-pressure heater vapour side, and the 3rd outlet of pressure flash vessel is even
Connecing the first entrance of oxygen-eliminating device, the 4th outlet of pressure flash vessel connects the entrance of unit rhone, boiler side auxiliary vapour header
First outlet is connected to the second entrance of high-pressure heater vapour side, and the outlet of high-pressure heater vapour side is connected to the second of oxygen-eliminating device
Entrance, the 3rd outlet of boiler side auxiliary vapour header connects the 3rd entrance of oxygen-eliminating device.
This utility model is further improved by, and the outlet of separator storage tank connects the pipe of the entrance of pressure flash vessel
Being provided with separator water storage tank water level control valve on road, the second outlet of pressure flash vessel connects the first of high-pressure heater vapour side
Being provided with pressure flash vessel pressure-regulating valve on the pipeline of entrance, the 3rd outlet of pressure flash vessel connects the first of oxygen-eliminating device and enters
Being provided with pressure flash vessel the first level control valve on the pipeline of mouth, the 4th outlet of pressure flash vessel connects unit rhone
Being provided with pressure flash vessel the second level control valve on entrance official road, the 3rd outlet of boiler side auxiliary vapour header connects oxygen-eliminating device
It is provided with oxygen-eliminating device on the pipeline of the 3rd entrance and is connected to hyperbaric heating for steam control valve, the first outlet of boiler side auxiliary vapour header
Being provided with high-pressure heater on the pipeline of the second entrance of device vapour side and supply steam control valve, the outlet of high-pressure heater vapour side is connected to
It is provided with high-pressure heater level control valve on second inlet duct of oxygen-eliminating device.
This utility model is further improved by, and also includes that boiler reheater, the first steam converter valve, boiler body blow
Ash steam main, the second steam converter valve and steam turbine side auxiliary vapour header；Wherein,
The outlet of boiler reheater is connected to the entrance of boiler body boiler sootblowing steam mother's pipe, pot by the first steam converter valve
The outlet of furnace body boiler sootblowing steam mother's pipe is connected to the second entrance of boiler side auxiliary vapour header, boiler by the second steam converter valve
Side auxiliary vapour header and steam turbine side auxiliary vapour header are by Bidirectional adjusting valve UNICOM.
This utility model is further improved by, also include boiler side steam user, steam turbine side steam user, four sections take out
Vapour supplies auxiliary steam pipe road for auxiliary vapour mother pipe, cold section of reheating vapour for auxiliary steam pipe road and external steam；Wherein,
Boiler side steam user is connected to the second outlet of boiler side auxiliary vapour header；Steam turbine side steam user is connected to steam turbine
The outlet of side auxiliary vapour header；First to the 3rd entrance of steam turbine side auxiliary vapour header be connected to four sections draw gas for auxiliary vapour mothers pipe,
Cold section of reheating vapour supplies on auxiliary steam pipe road for auxiliary steam pipe road and external steam.
Compared with prior art, this utility model has the advantage that
A kind of Start-up Systems for Direct-through Boilers that this utility model provides.This system and current normally used system are compared
There is following several respects clear advantage:
Use passive method to reclaim direct current cooker and start hydrophobic.A does not use air hydrophobic development unit, overcomes big
Gas hydrophobic development unit reclaims hydrophobic existing shortcoming；B need not use boiler water circulating pump, solves boiler water circulating pump recovery and opens
Dynamic hydrophobic existing problem；The startup of c direct current cooker is hydrophobic utilizes pressure flash vessel dilatation blood pressure lowering, and produce after dilatation blood pressure lowering is full
Also there is certain pressure with water and saturated vapor self, utilize this pressure can water and steam be separately recovered to oxygen-eliminating device, auxiliary
In vapour header, it is not necessary to extra power, it is not necessary to extra consumed energy, there is energy-conservation effect；D removal process need not volume
Outer cooling measure, starts hydrophobic energy and does not lose, have effect of consumption reduction；E does not spread steam to surrounding, has joint
Water, the effect of the pollution that lowers consumption, reduces；
This utility model provides a kind of Start-up Systems for Direct-through Boilers, has the following advantages: (1) passes through boiler reheater to pot
Stove auxiliary vapour header steam supply, boiler reheated steam parameter after firing about 1 hour just can be close to auxiliary vapour parameter, now the machine
Boiler just to auxiliary vapour header steam supply, thus can decrease the unit starting dependency to external steam, shortens use outside
The time of steam, also save operating cost.(2) no matter the machine boiler steam supply all can meet unit from flow or on pressure
Start requirement.(3) boiler side auxiliary vapour header is managed with boiler body soot blowing mother by temperature-decreased pressure reducer and is connected, and boiler body soot blowing is female
Pipe rated operating pressures is generally about 2MPa, and newly-increased header, pipeline, valve equal pressure grade ratio are relatively low, and expense also compares
Cheaply.(4) boiler side vapour is taken from the header being positioned at boiler side, and steam turbine side vapour is taken from the auxiliary vapour header of steam turbine side,
Decrease pipeline usage amount (taking from the auxiliary vapour header of steam turbine side relative to boiler side vapour), save cost of investment.(5) adopt
After designing by the system of self steam supply, capacity and the reliability of starting trouble just can reduce when design, thus investment reduction.
(6) after the unexpected chaser of unit, boiler overbottom pressure can be auxiliary vapour steam supply immediately, is that the recovery supply in the outside vapour source of auxiliary vapour provides
Time, such that it is able to avoid accident to expand further because auxiliary vapour loses, and shorten the time of unit recovery startup optimization.
Before steam turbine red switch, the steam that boiler produces is intended to be discharged into condenser by turbine by-pass, is discharged into condensing
The steam heat of device is unserviceable, by boiler auxiliary vapour header, employs reheated steam, decreases reheated steam and be discharged into solidifying
Vapour device.(1) directly reclaimed the heat of reject steam, there is energy-saving effect；(2) temperature of water is condensed the startup stage of reducing,
Improve the efficiency of steam turbine；(3) condensing the temperature of water startup stage of reducing, the safe operation to precision processing system is favourable；
(4) decrease exerting oneself of solidifying pump, there is energy-saving effect；(5) hot vapour source that adds of the high-pressure heater of unit is extracted steam from turbine, existing
Have technology, startup stage high-pressure heater vapour side cannot come into operation, and this utility model startup stage introduce steam enter
Height adds vapour side so that height can put into operation in the case of being added in underload, just need not to reclaim hydrophobic after state become a cadre by direct current cooker,
High-pressure heater now can normally come into operation, and make use of the neutral gear phase that height adds dexterously, improves the service efficiency of unit equipment,
Reduce unit cost, be reduced effect of investment；(6) in initial start stage, the temperature of feedwater heats mainly by oxygen-eliminating device, deoxygenation
The hot vapour source that adds of device is generally auxiliary vapour, and the vapour amount of auxiliary vapour is limited, and therefore feed temperature is typically difficult to improve, and the method reclaims
The boiler startup of a large amount of high temperature is hydrophobic, improves the temperature of deaerator feedwater.Simultaneously because the input that height adds heats further
Boiler feedwater so that feed temperature significantly improves；(7) along with the raising of feed temperature, and then improve boiler economizer, steaming
Send out heating surface and fire box temperature, favourable to boiler startup initiation combustion, the beneficially safe operation of boiler, saved combustion simultaneously
Material.
Accompanying drawing illustrates:
Fig. 1 is the structured flowchart of a kind of Start-up Systems for Direct-through Boilers of this utility model.
In figure: 1 is boiler reheater, 2 is the first steam converter valve, and 3 is boiler body boiler sootblowing steam mother pipe, and 4 is second
Steam converter valve, 5 is boiler side auxiliary vapour header, and 6 is boiler side steam user, and 7 is steam turbine side steam user, and 8 are four sections draws gas
Managing for auxiliary vapour mother, 9 is that cold section of reheating vapour supplies auxiliary steam pipe road, and 10 supply auxiliary steam pipe road for external steam, and 11 is steam turbine side auxiliary vapour header,
12 is separator storage tank, and 13 is separator water storage tank water level control valve, and 14 is atmospheric dump valve, and 15 is high-pressure heater steam supply
Regulation valve, 16 supply steam control valve for oxygen-eliminating device, and 17 is pressure flash vessel, and 18 is high-pressure heater vapour side, and 19 is oxygen-eliminating device, and 20 are
Pressure flash vessel the second level control valve, 21 is pressure flash vessel the first level control valve, and 22 is unit rhone, and 23 is two-way
Regulation valve, 24 is high-pressure heater level control valve, and 25 is pressure flash vessel pressure-regulating valve.
Detailed description of the invention:
This utility model one direct current cooker starts method, specifically includes following steps:
361 valves at thermal power generation unit direct current cooker are followed by a pressure flash vessel；
Draw two-way jet chimney on pressure flash vessel top, a-road-through is toward high-pressure heater vapour side, and air is arranged on a road；
Draw two path water pipeline in pressure flash vessel bottom, a-road-through is toward on oxygen-eliminating device water supply pipeline, and a-road-through is toward unit
Rhone；
During unit starting, when water quality is defective, water drains into unit rhone by pressure flash vessel, after water quality is qualified
It is recycled to oxygen-eliminating device；
Pressure flash vessel water level is controlled by bottom blow valve, and controlling peak level does not affect the full of entrance pressure flash vessel
Dilatation with water, separation.Under any circumstance, when bottom blow valve standard-sized sheet, pressure flash vessel water level should not be greater than Gao Shui
Position.
The pressure of pressure flash vessel is controlled by top exhaust steam valve, control pressure flash vessel pressure be slightly above auxiliary steam pressure and
Oxygen-eliminating device pressure.Under any circumstance, when top vent valve standard-sized sheet, pressure flash vessel pressure should not be greater than 2MPa.
There is two-way in boiler side auxiliary vapour header vapour source, and the first via is the boiler soot-blowing steam through pressure and temperature reducing, and the second tunnel is vapour
Pusher side auxiliary vapour header.Boiler side auxiliary vapour header and steam turbine side auxiliary vapour header can mutual steam supply.Boiler soot-blowing steam be boiler again
The steam of vapours pressure and temperature reducing.
The user of boiler side auxiliary vapour header is plasma steam air heater, air preheater soot blowing, oxygen-eliminating device, Gao Jiajia vapours, vapour
Wind symptom machine vapour source, ash bucket heating, oil fuel atomizing steam, fuel oil purge steam, Factory Building heating steam etc..
The method utilizing a kind of Start-up Systems for Direct-through Boilers that this utility model provides, comprises the following steps:
1) direct current cooker is in initial start stage, first passes through external steam and supplies to steam turbine side auxiliary vapour header 11 for auxiliary steam pipe road 10
Vapour, then taken from boiler side auxiliary vapour header 5 to boiler side auxiliary vapour header 5 steam supply, boiler side steam user 6 by Bidirectional adjusting valve 23
Vapour, steam turbine side steam user 7 takes vapour from steam turbine side auxiliary vapour header 11；
2) direct current cooker is in rinse stage, and the water discharged from separator storage tank 12, by pressure flash vessel the first water level
Regulation valve 21 or pressure flash vessel the second level control valve 20 control pressure flash vessel 17 and run at ordinary water level, and by separating
Device water storage tank water level control valve 13 controls separator storage tank 12 and runs at ordinary water level, chemically examines from pressure flash vessel 17 discharge
Water, if water quality is qualified, is discharged into oxygen-eliminating device by the water in pressure flash vessel 17 by pressure flash vessel the first level control valve 21
19, if water quality is defective, the water in pressure flash vessel 17 is discharged into unit by pressure flash vessel the second level control valve 20
Rhone 22；
3) direct current cooker is after firing, the water discharged from separator storage tank 12, is controlled by separator water storage tank water level
After valve 13 enters pressure flash vessel 17, some steam will be produced, if steam quality is qualified, by the vapour in pressure flash vessel 17
It is discharged into high-pressure heater vapour side 18, if steam quality is defective, by pressure dilatation by pressure flash vessel pressure-regulating valve 25
Vapour in device 17 is discharged into air by atmospheric dump valve 14, in the process by pressure flash vessel pressure-regulating valve 25 or air
Drain valve 14 regulates the pressure of pressure flash vessel 17 and is slightly above the pressure of oxygen-eliminating device 19, so that the water in pressure flash vessel 17 can
It is discharged into oxygen-eliminating device 19 smoothly；
4) at direct current cooker reheater pressure higher than after external steam pressure, by the steam in boiler reheater 1 by the
One steam converter valve 2 imports boiler body boiler sootblowing steam mother's pipe 3, then imports boiler side auxiliary vapour connection by the second steam converter valve 4
Case 5, incrementally increases from boiler reheater 1 to the steam supply of boiler side auxiliary vapour header 5, reduces from steam turbine side auxiliary vapour header 11 to boiler
The steam supply of side auxiliary vapour header 5, reduce external steam usage amount, when from boiler reheater 1 to the steam supply of boiler side auxiliary vapour header 5
Time abundant, boiler side auxiliary vapour header 5 to steam turbine side auxiliary vapour header 11 steam supply, stops using outside steaming by Bidirectional adjusting valve 23
Vapour；
5), in direct current cooker start-up course, after stopping using external steam, reheated steam is used to join to the auxiliary vapour of boiler side
Case 5 and steam turbine side auxiliary vapour header 11 steam supply, sends condenser to by bypass reducing steam, and strengthens from boiler side auxiliary vapour header
5 to oxygen-eliminating device 9 and the steam supply of high-pressure heater vapour side 18, improves feed temperature, accelerates unit starting speed；
6) after state operation become a cadre by direct current cooker, pressure flash vessel 17 is isolated operation, when four sections are drawn gas or cold section of reheating
After the pressure of vapour is higher than the pressure of steam turbine side auxiliary vapour header 11, steam turbine side auxiliary vapour header 11 and the steam of boiler side auxiliary vapour header 5
Four sections are switched to draw gas or cold section of reheating vapour steam supply, from boiler body boiler sootblowing steam mother's pipe 3 to the steam supply of boiler side auxiliary vapour header 5
Cut.
Below as a example by certain power plant 660MW Supercritical Unit Once-through Boiler startup system, the concrete of this utility model is described
Embodiment.
When changing according to boiler design parameter determination direct current cooker dry and wet state, boiler feedwater flow is 520t/h, separator goes out
Mouth steam pressure 10MPa, temperature 310 DEG C；
According to unit design parameter, when determining unit peak load operating mode, the steam supply flow of oxygen-eliminating device is 182t/h, pressure
1.1MPa, temperature 355 DEG C；
According to unit design parameter, when determining unit peak load operating mode, No. 1 high adds to No. 2 hydrophobic flows in Gao Jiaqi side
For 142t/h, pressure be 7.2Mpa, temperature be 263 DEG C；
According to unit design parameter, when determining unit peak load operating mode, No. 2 high add No. 3 hydrophobic flows in Gao Jiaqi side
310t/h, pressure 4.7MPa, temperature 220 DEG C；
According to unit design parameter, when determining unit peak load operating mode, No. 3 high add to the flow 396t/ that oxygen-eliminating device is hydrophobic
H, pressure 2.26MPa, temperature 189 DEG C；
Saturated according to boiler design parameter determination direct current cooker separator outlet steam flow at various pressures, storage tank
Discharge.Calculate and saturation water constant enthalpy dilatation (higher than 2MPa) under different pressures is depressurized to dilatation required for 2.0MPa pressure
Multiple.Result of calculation is shown in Table 1:
Table 1 saturation water dilatation result of calculation collects
As can be seen from the above table when starting separator pressure and being 6MPa, the pressure flash vessel volume of needs is maximum, now
Dilatation multiple be 2.61.Pressure is the highest, and the multiple needing dilatation is the biggest, but after increasing due to pressure, starts and dredge discharge reduction,
The volume needing dilatation reduces on the contrary.
Choose pressure flash vessel 5 times that flow area is separator sump drain pipe flow area, volume is 11m3(i.e.
The maximum volume of 1 minute), carry out design pressure flash vessel.
Steam-water separator storage tank draining cut-in pressure flash vessel after 361 valves.Pressure flash vessel draining one tunnel is connected to remove
On oxygen device feedwater piping, counting this flow is 520t/h.One tunnel is connected to unit rhone, and counting this flow is 520t/h.Pressure dilatation
Device has two-way steam discharge, and a road steam discharge is air, and counting this flow is 40t/h, and a road steam discharge enters high-pressure heater vapour side, counts this stream
Amount is 40t/h.Pressure flash vessel to oxygen-eliminating device, auxiliary steam header pipeline on design regulation valve, regulate entrance with it
The water of oxygen-eliminating device and the steam flow of the auxiliary vapour header of entrance, control water level and the pressure of pressure flash vessel further.
The energy dissipating measure that the water of this pressure flash vessel 10Mpa to be considered pressure enters, safety door to be had, temperature, pressure, water
Position measuring point；Other NM design factor electric pressure to be met force container of pressure flash vessel and the design standard of pipeline.
During unit starting, when water quality is defective, water drains into unit rhone by pressure flash vessel；Qualified water leads to
Excess pressure flash vessel enters oxygen-eliminating device；When the quality of pressure flash vessel steam discharge is defective, enter air by air bleeding valve；Pressure expands
When container steam discharge quality is qualified, the steam discharge in pressure flash vessel is entered high-pressure heater vapour side to heat feedwater.
Before main boiler is lighted a fire, the steam supply of starting trouble only needs to maintain the heating of turbine shaft seal, oxygen-eliminating device, plasma warm braw
Device, air preheater soot blowing in the case of underload with vapour, boiler side auxiliary vapour header pressure 0.5MPa now can be maintained left
Right.
After main boiler igniting, about 40 minutes, separator pressure was more than 0.8MPa, now can maintain pressure flash vessel pressure
Power 0.6MPa, pressure flash vessel be drained into oxygen-eliminating device, the steam of pressure flash vessel enters the vapour side of high-pressure heater, is used for
Heating feedwater.Having arrived oxygen-eliminating device owing to starting the Water Sproading of separator, the temperature of oxygen-eliminating device can reach more than 100 DEG C, condenses water
Pump has only to low discharge to oxygen-eliminating device moisturizing.Owing to height adds input, height adds water outlet temperature can reach more than 150 DEG C.
After igniting about about 80 minutes, boiler reheated steam pressure reached about 0.8Mpa, and temperature reaches 210 DEG C of left sides
The right side, now boiler reheater to boiler side auxiliary vapour header steam supply, and then counter can deliver to steam turbine side auxiliary vapour header, and starting trouble can
To gradually reduce until exiting.After igniting about 150 minutes, reheated steam pressure reached 2MPa, and temperature reaches 300 DEG C, now
Auxiliary vapour is supplied by the machine boiler, and the pressure of auxiliary vapour, flow, temperature all can be guaranteed, can be the most successfully at main steam turbine
Carry out steam feed pump red switch etc. before red switch and need the work of auxiliary vapour, for big load can be carried rapidly after set grid-connection ready.
The most about 320 minutes, set grid-connection.After 380 minutes, state of becoming a cadre is run, and boiler start-up system exits fortune
OK.Along with load raises, after igniting about 480 minutes, after four sections of pressure drawn gas exceed auxiliary steam pressure, auxiliary vapour vapour source switched to
Four sections are drawn gas, and the machine boiler only stays a small amount of steam, to ensure that steam line is in hot stand-by duty for auxiliary vapour.
According to this design, it is only necessary to being equipped with the starting trouble of a 20t/h, conventional design then needs to be equipped with one
The starting trouble of 35t/h.
In the Construction of Unit stage, during boiler blow piping, airport logistic park, on-load test run, each main boiler is lighted a fire latter 1
About hour, auxiliary vapour is supplied by the machine main boiler, and starting trouble can exit, and starting trouble runs the time and fewer than conventional design transports
Go at least 150 hours, saving fuel oil more than 300 ton.
After unit is properly functioning, during cold start, starting trouble runs 8 hours less, saving fuel oil about 16 tons.Temperature state and
During hot starting, hot start, if main steam pressure is more than 1Mpa, starting trouble can be started without, directly utilize the machine steam kettle
Furnace igniting, each starting trouble runs about 5 hours less, saving fuel oil about 10 tons.
Claims (4)
1. a Start-up Systems for Direct-through Boilers, it is characterised in that: include separator storage tank (12), pressure flash vessel (17), height
Pressure heater vapour side (18), oxygen-eliminating device (19), boiler side auxiliary vapour header (5) and unit rhone (22)；Wherein,
The outlet of separator storage tank (12) connects the entrance of pressure flash vessel (17), and the first outlet of pressure flash vessel (17) is even
Connecing atmospheric dump valve (14), the second outlet of pressure flash vessel (17) connects the first entrance of high-pressure heater vapour side (18), pressure
3rd outlet of power flash vessel (17) connects the first entrance of oxygen-eliminating device (19), the 4th outlet connection machine of pressure flash vessel (17)
The entrance of group rhone (22), the first outlet of boiler side auxiliary vapour header (5) is connected to the second of high-pressure heater vapour side (18)
Entrance, the outlet of high-pressure heater vapour side (18) is connected to the second entrance of oxygen-eliminating device (19), the of boiler side auxiliary vapour header (5)
Three outlets connect the 3rd entrance of oxygen-eliminating device (19).
A kind of Start-up Systems for Direct-through Boilers the most according to claim 1, it is characterised in that: going out of separator storage tank (12)
It is provided with separator water storage tank water level control valve (13), pressure flash vessel on the pipeline of the entrance that mouth connects pressure flash vessel (17)
(17) it is provided with pressure flash vessel pressure on the pipeline of the first entrance that the second outlet connects high-pressure heater vapour side (18) to adjust
Joint valve (25), the pipeline of the first entrance that the 3rd outlet of pressure flash vessel (17) connects oxygen-eliminating device (19) is provided with pressure and expands
Container the first level control valve (21), the 4th outlet of pressure flash vessel (17) connects on the entrance official road of unit rhone (22)
Being provided with pressure flash vessel the second level control valve (20), the 3rd outlet of boiler side auxiliary vapour header (5) connects oxygen-eliminating device (19)
The 3rd entrance pipeline on be provided with oxygen-eliminating device for steam control valve (16), boiler side auxiliary vapour header (5) first outlet connect
The pipeline of the second entrance of high-pressure heater vapour side (18) is provided with high-pressure heater for steam control valve (15), hyperbaric heating
The outlet of device vapour side (18) is connected on the second inlet duct of oxygen-eliminating device (19) be provided with high-pressure heater level control valve
(24)。
A kind of Start-up Systems for Direct-through Boilers the most according to claim 1, it is characterised in that: also include boiler reheater (1),
First steam converter valve (2), boiler body boiler sootblowing steam mother manage (3), the second steam converter valve (4) and steam turbine side auxiliary vapour header
(11)；Wherein,
The outlet of boiler reheater (1) is connected to entering of boiler body boiler sootblowing steam mother pipe (3) by the first steam converter valve (2)
Mouthful, the outlet of boiler body boiler sootblowing steam mother pipe (3) is connected to boiler side auxiliary vapour header (5) by the second steam converter valve (4)
The second entrance, boiler side auxiliary vapour header (5) and steam turbine side auxiliary vapour header (11) are by Bidirectional adjusting valve (23) UNICOM.
A kind of Start-up Systems for Direct-through Boilers the most according to claim 1, it is characterised in that: also include boiler side steam user
(6), steam turbine side steam user (7), four sections draw gas for auxiliary vapour mother pipe (8), cold section of reheating vapour is for auxiliary steam pipe road (9) and outside steams
Vapour is for auxiliary steam pipe road (10)；Wherein,
Boiler side steam user (6) is connected to the second outlet of boiler side auxiliary vapour header (5)；Steam turbine side steam user (7) connects
Outlet in steam turbine side auxiliary vapour header (11)；First to the 3rd entrance of steam turbine side auxiliary vapour header (11) is connected to four sections and takes out
Vapour supplies on auxiliary steam pipe road (10) for auxiliary steam pipe road (9) and external steam for auxiliary vapour mother pipe (8), cold section of reheating vapour.
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