CN105953208B - A kind of boiler startup separation reject steam utilizes device and method - Google Patents
A kind of boiler startup separation reject steam utilizes device and method Download PDFInfo
- Publication number
- CN105953208B CN105953208B CN201610471633.XA CN201610471633A CN105953208B CN 105953208 B CN105953208 B CN 105953208B CN 201610471633 A CN201610471633 A CN 201610471633A CN 105953208 B CN105953208 B CN 105953208B
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- steam
- low
- oxygen
- boiler
- water
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Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
Abstract
The invention discloses a kind of boiler startup separation reject steams to utilize device and method, it is characterized by: be provided with two lines on the steam-water separator (13), all the way to be disposed with the first regulating valve (23), auxiliary steam pipeline (8) and oxygen-eliminating device (7) at described steam-water separator (13) rear；Another way is rear to be provided with reject steam No. 2 height of heating in the steam-water separator (13) pipeline (26), the second regulating valve (28), No. 2 height is added to add underload hydrophobic pipeline (27) and oxygen-eliminating device (7)；It overcomes the shortcomings that very hot startup operating condition generally seldom occurs, such as selectes bypass valve by very hot state operating condition, place capacity can be made excessive, cause equipment and pipeline investment high, cause idle waste for equipment in the prior art；Water supply is heated to 180 DEG C with steaming using boiler itself, it is possible to reduce the advantages of fuel consumption of starting trouble does not consume steam as the occasion requires, increases the generated energy of adjacent unit.
Description
Technical field
The present invention relates to thermal power plant concurrent boiler start-up separation systems, are more specifically a kind of boiler startups
It separates reject steam and utilizes device and method.
Background technique
Existing supercritical unit is in the unit starting stage, and there are boiler duty and steam turbine throttle flow is unmatched asks
Topic, is respectively provided with high pressure bypass valve and low voltage bypass valve on main steam line and high-temperature reheat pipe road, steams overheat
Extra steam respectively enters the reheater of boiler and is coagulated after bypass valve pressure and temperature reducing in vapour system and reheating steam system
Vapour device.
The Starting mode of unit is divided into cold start (shutting down more than 72 hours), warm starting according to the length of downtime
(shut down 10-72 hour), hot starting, hot start (shut down and be less than 10 hours), very hot startup (shutting down less than 1 hour), steam turbine is into vapour
Pressure when red switch and be certain into vapour, but since boiler is under different Starting mode, the heat of accumulation is not identical, reaches phase
With pressure under steam production it is also not identical, therefore match four kinds of Starting mode when shunt location selection differential it is also larger.
By taking a certain typical 350MW supercritical unit as an example, when configuration starting bypasses, in order to meet different Starting mode machines
The matched needs of furnace, according to machine furnace combined launch curve, calculated hp and lp bypass valve capacity is as follows:
| High pressure bypass valve | Cold start | Warm starting | Hot starting, hot start | Very hot startup |
| BMCR main steam flow | 16% | 31% | 36% | 45% |
| Low voltage bypass valve | Cold start | Warm starting | Hot starting, hot start | Very hot startup |
| BMCR high temperature reheated steam flow | 31% | 55% | 67% | 82% |
As can be seen from the above table, under very hot startup operating condition, required bypass valve flow is larger, such as by cold conditions, warm state,
Hot starting, hot start considers that high pressure turbine by valve capacity presses 40%BMCR flow, and low voltage bypass valve presses 70%BMCR flow.If you need to
Meet very hot startup, high pressure turbine by valve capacity needs to increase to 45%BMCR capacity, and low voltage bypass valve needs to increase to 82%
BMCR flow.
After unit regulation terminates to enter comercial operation, very hot startup operating condition generally seldom occurs, and such as presses very hot state work
Condition selectes bypass valve, and place capacity can be made excessive, causes equipment and pipeline investment high, causes idle waste for equipment.Therefore,
It is necessary to improve to system.
Summary of the invention
The first object of the present invention is to overcome the shortcoming of above-mentioned background technology, and proposes a kind of boiler startup separation
Reject steam utilizes device.
A kind of boiler startup separation reject steam of the present invention utilizes device, it includes turbine low pressure cylinder, condenser, condensation
Water pump, low-pressure heater, oxygen-eliminating device, steam feed pump, high-pressure heater, economizer, steam-water separator, roof enclosure wall low temperature mistake
Hot device, pendant superheater, high temperature superheater, steam turbine high-pressure cylinder, high temperature reheater, low-temperature reheater, intermediate pressure cylinder, and successively go here and there
Connection, it is characterised in that: rear is disposed with two lines on the steam-water separator, all the way in the carbonated drink point
Device rear is provided with the first regulating valve, auxiliary steam pipeline and oxygen-eliminating device；Another way is in the steam-water separator rear
Side is provided with No. two high-pressure heater pipelines of reject steam heating, the second regulating valve, No. two height and adds underload hydrophobic pipeline and remove
Oxygen device.
In the above-mentioned technical solutions: when the steam production of boiler and steam turbine throttle flow mismatch, it is included in high temperature mistake
Hot device rear be provided with high pressure bypass valve, low-temperature reheat pipe road, high temperature reheater, low-temperature reheater, low voltage bypass valve and
Condenser.
In the above-mentioned technical solutions: one end of two steam-water separators is provided with water storage tank；One end of oxygen-eliminating device is arranged
There is auxiliary steam pipeline.
The second object of the present invention is to overcome the shortcoming of above-mentioned background technology, and proposes a kind of boiler startup separation
Reject steam utilizes method.
A kind of boiler startup separation reject steam of the present invention utilizes method, it is characterised in that: it includes following process:
, at unit starting initial stage, the steam being discharged from turbine low pressure cylinder is after condenser condenses, then through condensing
Low-pressure heater is flowed through after water pump boosting and arrives oxygen-eliminating device again, and the water supply in oxygen-eliminating device flows through high pressure after steam feed pump pressurizes and adds
Hot device arrives the economizer of boiler again, and water supply enters steam-water separator progress steam-water separation by economizer, water-cooling wall in boiler,
, the steam separated in steam-water separator by steam-water separator enter roof enclosure wall low temperature superheater and
Pendant superheater finally becomes to enter steam turbine high-pressure cylinder through main steam line after superheated steam in high temperature superheater；
, described steam turbine high-pressure cylinder steam discharge through low-temperature reheat pipe road, low-temperature reheater, high temperature reheater
The intermediate pressure cylinder of steam turbine is entered back into afterwards.
In the above-mentioned technical solutions: at unit starting initial stage, when the steam production of boiler and steam turbine throttle flow mismatch,
The excess steam that high temperature superheater generates enters low-temperature reheat pipe road by high pressure bypass valve, and steam flows to high temperature reheater
The extra reheated steam generated enters back into condenser by low-temperature reheater, low voltage bypass valve.
In the above-mentioned technical solutions: the water that steam-water separator is separated enters water storage tank；The heating steam of oxygen-eliminating device
From auxiliary steam pipeline.
In the above-mentioned technical solutions: two road steam are drawn in the steam-water separator, wherein steam is via bypass all the way
Steam heats oxygen-eliminating device pipeline, and air vent pipework road is entered after the decompression of the first regulating valve, and reheating enters in oxygen-eliminating device；Separately
Steam enters reject steam after the decompression of the second regulating valve and heats No. two high-pressure heater pipelines all the way, is added by No. two height low
Load hydrophobic pipeline enters oxygen-eliminating device.
The present invention includes following technological merit: 1, under very hot startup, the saturation of 18.5t/h is drawn from starting separator
Steam removes the condensed water in heating oxygen-eliminating device, and the saturated vapor of about 30t/h goes the water supply of No. 2 Gao Jianei of heating, can be by water supply
Temperature is steamed using boiler itself is heated to 180 DEG C, reduces the boiler startup time.
2, the superheated steam of boiler export is reduced, and is reduced to 35%BMCR to hold by 45% by this selected high pressure turbine by valve capacity
Amount, low voltage bypass valve capacity are reduced to 60%BMCR capacity by 82%BMCR capacity, reduce the capacity of bypass valve, reduce equipment
Initial outlay；Although increasing a few road regulating valve pipelines, pipeline running temperature is not high, and pipeline and valve use low-alloy steel material
, increased pipeline and valve are far below reduced bypass valve equipment investment.
3, it is steamed using boiler itself and water supply is heated to 180 DEG C, will given compared to using auxiliary vapour or as the occasion requires steam heating
Water is heated to 180 DEG C, it is possible to reduce the fuel consumption of starting trouble does not consume steam as the occasion requires, increases the power generation of adjacent unit
Amount.
4, this system is especially for double reheat power generation sets, at unit starting initial stage since load is relatively low, double reheat temperature
It is slower to spend temperature rise, it is corresponding secondary since main steam, a hot arc, secondary hot arc quantity of steam are reduced after this system
Hot arc caloric receptivity will increase, and can accelerate the secondary hot arc temperature rise speed of double reheat power generation sets, substantially reduce the starting time of unit.
Detailed description of the invention
Fig. 1 is the connection types such as existing boiler steam-water separator, bypass valve, steam turbine, oxygen-eliminating device.
Fig. 2 is the connection type of improved steam-water separator, bypass valve, steam turbine, oxygen-eliminating device etc..
In figure: low pressure (LP) cylinder 1, intermediate pressure cylinder 2, high pressure cylinder 3, condenser 4, condensate pump 5, low-pressure heater 6, oxygen-eliminating device 7
, auxiliary steam pipeline 8, steam feed pump 9, high-pressure heater 10, economizer 11, water-cooling wall 12, steam-water separator 13, water storage
Case 14, steam-water separator 15, roof enclosure wall low temperature superheater 16, pendant superheater 17, high temperature superheater 18, low-temperature reheater
19, high temperature reheater 20, high pressure bypass valve 21, low voltage bypass valve 22, the first regulating valve 23, reject steam heat oxygen-eliminating device pipeline
24, low-temperature reheat pipe road 25, reject steam heating 26, No. two height of No. two high-pressure heater pipelines add underload drain pipe
Road 27, the second regulating valve 28.
Specific embodiment
The performance that the invention will now be described in detail with reference to the accompanying drawings, but they do not constitute the limit to the utility model
It is fixed, it is only for example, while by illustrating that advantages of the present invention will become clearer and be readily appreciated that.
Referring to Fig.1 shown in -2: a kind of boiler startup separation reject steam of the present invention utilizes device, it includes steam turbine low-pressure
Cylinder 1, condenser 4, condensate pump 5, low-pressure heater 6, oxygen-eliminating device 7, steam feed pump 9, high-pressure heater 10, economizer 11,
Steam-water separator 13, roof enclosure wall low temperature superheater 16, pendant superheater 17, high temperature superheater 18, steam turbine high-pressure cylinder 3, height
Warm reheater 20, low-temperature reheater 19, intermediate pressure cylinder 2, and be sequentially connected in series, it is characterised in that: on the steam-water separator 13
Two lines are provided with, all the way to be provided with the first regulating valve 23, auxiliary steam pipeline 8 at 13 rear of steam-water separator
With oxygen-eliminating device 7；Another way is that rear is provided with reject steam in the steam-water separator 13 to heat No. two high-pressure heaters
Pipeline 26, rear are provided with 23, No. two height of regulating valve and add underload hydrophobic pipeline 27 and oxygen-eliminating device 7.
When the steam production of boiler and steam turbine throttle flow mismatch, high temperature superheater 18 be provided with high pressure bypass valve 21,
Low-temperature reheat pipe road 25, high temperature reheater 20, low-temperature reheater 19, low voltage bypass valve 22, in condenser 4；Steam-water separation
The water that device 13 is separated enters water storage tank 14；The heating steam of oxygen-eliminating device 7 comes from auxiliary steam pipeline 8.
The invention also includes a kind of boiler startup separation reject steams to utilize method, it is characterised in that: it includes as flowed down
Journey:
, at unit starting initial stage, the steam being discharged from turbine low pressure cylinder 1 is after the condensation of condenser 4, then through solidifying
It flows through low-pressure heater 6 after bearing water 5 boosting of pump and arrive oxygen-eliminating device 7 again, the water supply in oxygen-eliminating device 7 is flowed after steam feed pump 9 pressurizes
The economizer 11 for arriving boiler again through high-pressure heater 10, water supply enters carbonated drink point by economizer 11, water-cooling wall 12 in boiler
Steam-water separation is carried out from device 13,
, the steam separated in steam-water separator 13 enter roof enclosure wall cryogenic overheating by steam-water separator 15
Device 16 and pendant superheater 17 finally become to enter steam turbine height through main steam line after superheated steam in high temperature superheater 18
Cylinder pressure 3；
, described steam turbine high-pressure cylinder 3 steam discharge through low-temperature reheat pipe road 25, high temperature reheater 20, low temperature again
The intermediate pressure cylinder 2 of steam turbine is entered back into after hot device 19.
At unit starting initial stage, when the steam production of boiler and steam turbine throttle flow mismatch, high temperature superheater 18 is generated
Excess steam by high pressure bypass valve 21 enter low-temperature reheat pipe road 25, steam flow to high temperature reheater 20 generation it is more
Remaining reheated steam enters back into condenser 4 by low-temperature reheater 19, low voltage bypass valve 22.
The water that steam-water separator 13 is separated enters water storage tank 14；The heating steam of oxygen-eliminating device 7 comes from air vent pipework
Road 8.
Two road steam are drawn in the steam-water separator 13, wherein steam is via reject steam heating oxygen-eliminating device pipe all the way
Road 24, enters air vent pipework road 8 after the decompression of the first regulating valve 23, and reheating enters in oxygen-eliminating device 7；Another way steam warp
Reject steam is entered after the decompression of second regulating valve 28 and heats No. two high-pressure heater pipelines 26, adds underload to dredge by No. two height
Water lines 27 enter oxygen-eliminating device 7.
Above-mentioned unspecified part is the prior art.
Claims (6)
1. a kind of boiler startup separation reject steam utilizes device, it includes turbine low pressure cylinder (1), condenser (4), condensed water
Pump (5), low-pressure heater (6), oxygen-eliminating device (7), steam feed pump (9), high-pressure heater (10), economizer (11), carbonated drink point
From device (13), roof enclosure wall low temperature superheater (16), pendant superheater (17), high temperature superheater (18), steam turbine high-pressure cylinder
(3), high temperature reheater (20), low-temperature reheater (19), intermediate pressure cylinder (2), and be sequentially connected in series, it is characterised in that: in the vapour
Separator is provided with two lines on (13), all the way to be disposed with the first tune at described steam-water separator (13) rear
Save valve (23), auxiliary steam pipeline (8) and oxygen-eliminating device (7)；Another way is to be arranged at the rear of the steam-water separator (13)
There are No. two high-pressure heater pipelines (26) of reject steam heating, the second regulating valve (28), No. two height to add underload hydrophobic pipeline
(27) and oxygen-eliminating device (7)；When the steam production of boiler and steam turbine throttle flow mismatch, high temperature superheater (18) is generated extra
Steam enters low-temperature reheat pipe road (25) by high pressure bypass valve (21), and steam flows to the more of high temperature reheater (20) generation
Remaining reheated steam enters back into condenser (4) by low-temperature reheater (19), low voltage bypass valve (22).
2. a kind of boiler startup separation reject steam according to claim 1 utilizes device, it is characterised in that: in two vapour
One end of separator (13) is provided with water storage tank (14)；One end of oxygen-eliminating device (7) is provided with auxiliary steam pipeline (8).
3. a kind of boiler startup separation reject steam according to claim 1 utilizes the utilization method of device, feature exists
In: it includes following process:
, at unit starting initial stage, after the steam being discharged from turbine low pressure cylinder (1) is condensed by condenser (4), then through condensing
It flows through low-pressure heater (6) after water pump (5) boosting to arrive again oxygen-eliminating device (7), the water supply in oxygen-eliminating device (7) is through steam feed pump (9)
The economizer (11) that high-pressure heater (10) arrives boiler again is flowed through after pressurization, economizer (11), water cooling are passed through in water supply in boiler
Wall (12) enters steam-water separator (13) and carries out steam-water separation,
, the steam separated in steam-water separator (13) enter roof enclosure wall low temperature superheater by steam-water separator (15)
(16) and pendant superheater (17), finally become to enter steamer through main steam line after superheated steam high temperature superheater (18) is inner
Machine high pressure cylinder (3)；
, described steam turbine high-pressure cylinder (3) steam discharge through low-temperature reheat pipe road (25), high temperature reheater (20), low temperature
The intermediate pressure cylinder (2) of steam turbine is entered back into after reheater (19).
4. a kind of boiler startup separation reject steam according to claim 3 utilizes the utilization method of device, feature exists
In:
At unit starting initial stage, when the steam production of boiler and steam turbine throttle flow mismatch, what high temperature superheater (18) generated
Excess steam enters low-temperature reheat pipe road (25) by high pressure bypass valve (21), and steam flows to high temperature reheater (20) generation
Extra reheated steam entered back into condenser (4) by low-temperature reheater (19), low voltage bypass valve (22).
5. a kind of boiler startup separation reject steam according to claim 4 utilizes the utilization method of device, feature exists
In:
The water that steam-water separator (13) is separated enters water storage tank (14)；The heating steam of oxygen-eliminating device (7) comes from auxiliary steam
Pipeline (8).
6. a kind of boiler startup separation reject steam according to claim 4 or 5 utilizes the utilization method of device, feature
It is:
Two road steam are drawn in the steam-water separator (13), wherein steam is via reject steam heating oxygen-eliminating device pipeline all the way
(24), enter air vent pipework road (8) after the first regulating valve (23) decompression, reheating enters in oxygen-eliminating device (7)；Another way
Steam enters reject steam after the second regulating valve (28) are depressurized and heats No. two high-pressure heater pipelines (26), passes through No. two height
Underload hydrophobic pipeline (27) are added to enter oxygen-eliminating device (7).
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| CN201610471633.XA CN105953208B (en) | 2016-06-23 | 2016-06-23 | A kind of boiler startup separation reject steam utilizes device and method |
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| CN201610471633.XA CN105953208B (en) | 2016-06-23 | 2016-06-23 | A kind of boiler startup separation reject steam utilizes device and method |
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| CN107166355B (en) * | 2017-07-07 | 2019-03-01 | 宁波健益检测科技有限公司 | A kind of moist steam self-heating water scavenging system |
| CN108087863A (en) * | 2018-02-08 | 2018-05-29 | 西安西热节能技术有限公司 | A kind of neighbour's machine condensation water interacted system |
| CN108954291A (en) * | 2018-07-18 | 2018-12-07 | 深能合和电力（河源）有限公司 | A kind of power station unit pipe-line system |
| CN110553247A (en) * | 2019-10-09 | 2019-12-10 | 宁波正源电力有限公司 | Power station energy storage and heat supply peak-valley adjusting system and method |
| CN112303611A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Direct current furnace high energy water recovery system |
| CN114198738B (en) * | 2021-12-14 | 2024-02-02 | 华能山东石岛湾核电有限公司 | Water supply heating system of high-temperature gas cooled reactor |
| CN114321874A (en) * | 2022-01-05 | 2022-04-12 | 国家能源集团国源电力有限公司 | Boiler starting system |
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| GB1315806A (en) * | 1970-12-17 | 1973-05-02 | Westinghouse Electric Corp | Heat recovery steam generating arrangement employing means for preventing economizer steaming |
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| CN202188480U (en) * | 2010-11-22 | 2012-04-11 | 章礼道 | Direct-current furnace startup system with media voltage expansion separator |
| CN202188482U (en) * | 2011-06-02 | 2012-04-11 | 章礼道 | Pumpless direct-current furnace startup system capable of fully recycling working media and heat |
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