CN105782948B - Method for starting thermal power generating unit under recycling fault of turbine driven feed water pumps - Google Patents
Method for starting thermal power generating unit under recycling fault of turbine driven feed water pumps Download PDFInfo
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- CN105782948B CN105782948B CN201610232217.4A CN201610232217A CN105782948B CN 105782948 B CN105782948 B CN 105782948B CN 201610232217 A CN201610232217 A CN 201610232217A CN 105782948 B CN105782948 B CN 105782948B
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- feed pump
- boiler
- water
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- generating unit
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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
- F22D11/02—Arrangements of feed-water pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- 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
- F22B37/54—De-sludging or blow-down devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Water Supply & Treatment (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a method for starting a thermal power generating unit under the recycling faults of turbine driven feed water pumps. The method comprises the following steps: first, a small unit is started under appropriate steam drum pressure, and the steam drum pressure is made to keep stable under the appropriate steam drum pressure; second, the small unit is started at 1,800 rpm, a steam drum is directly fed with water through the turbine driven feed water pumps, another feed water pump is spared, the water feeding flow of a boiler is controlled by adjusting a water feeding bypass valve of the boiler, the minimal safe flow required for the starting of the turbine driven feed water pumps is ensured, and the phenomena of overheating and cavitation of pump bodies during the turbine driven feed water pump starting process are prevented; and third, blowdown valves of downcomers are adjusted on the side of the boiler, ring header drain valves are opened, and the numbers of front, rear, left and right lower interconnecting box blowdown water discharge valves are adjusted, the boiler blow-off way is reinforced to maintain the normal steam drum water level, the steam drum water level trip is avoided, and besides, cold washing and hot washing during the unit starting process are facilitated, and the water quality is made to meet the unit starting requirement as soon as possible.
Description
Technical field
The invention belongs to thermal power generating technology field, and in particular to a kind of fired power generating unit is in steam feed pump recirculation failure
Under startup method.
Background technology
The CHTC5/6 type steam feed pumps of Yiyang power plant one phase 2 Shenyang Water Pump Factory of 330MW crew qitings 2 production, volume
Constant volume 600m3/ h, minimum discharge 160m3The steam pump recycling pitch of/h. models Jing in unit operation often occur bite,
The failures such as valve element comes off, check-valves, heat pump cannot run on startup to cause unit, have a strong impact on unit safety, economical operation.
In unit starting, the minimum discharge needed for must ensureing to start in heat pump feed pump start-up course by steam pump recycling,
Steam feed pump is not opened or in the case that department opens in recirculation pitch failure, is do not possess entry condition, but real
Border variable load plant is when starting according to the change of electrical network power consumption, it is impossible to enough to carry out maintenance down for a long time, it is therefore necessary to grind
Study carefully and a kind of method started in the case of steam feed pump recirculation failure, ensure that fired power generating unit being capable of normal work.
The content of the invention
Present invention solves the technical problem that being：For the startup under existing fired power generating unit steam feed pump recirculation failure
An a kind of difficult problem, there is provided startup method of fired power generating unit under steam feed pump recirculation failure, under existing unit working condition,
Unit starting flow process is optimized, it is ensured that steam feed pump normally starts.
The present invention adopts the following technical scheme that realization：
Startup method of the fired power generating unit under steam feed pump recirculation failure, starts in accordance with the following steps：
The first step, selects drum pressure little machine of red switch under 1.3-2.8Mpa, by controlling the fuel needed for boiler combustion
Amount, stable boiler heat load make drum pressure keep stable in this pressure limit as far as possible；
Second step, by little machine red switch to 1800rpm, by steam feed pump directly to water on drum in warming-up process,
Other feed pumps adopt standby mode, bypass pitch control boiler water filling flow by adjusting boiler water filling, it is ensured that steam-operating feeds water
Minimum safe flow needed for pump startup, occurs in preventing feed pump start-up course that the pump housing is overheated, cavitation；
3rd step, in furnace side by adjustment down-comer sewage draining valve, and before opening annular header hydrophobic valve and adjusting,
Afterwards, the radical of left and right lower collecting box blowdown wicket, the mode for strengthening boiler blow-off maintain steam water-level normal, it is to avoid vapour occur
Bag water level accident, while being conducive to cold conditions in unit starting to rinse and hot flushing, makes water quality meet unit starting needs as early as possible.
Further, before the little machine of red switch, axle envelope that main frame is confirmed, vacuum system are normal.
Further, the minimum safe flow of the boiler water filling flow and steam feed pump in the second step is 150-
160T/H。
Further, in the 3rd step, when discharge is less than 150-160T/H on drum, increase lower collecting box wicket
Radical opens big correlation lower collecting box wicket aperture, it is ensured that upper discharge is stable in 150-160T/H；When discharge on drum
During more than 150-160T/H, reduce lower collecting box wicket radical or turn down related lower collecting box wicket aperture, it is ensured that upper current
Amount is stable in 150-160T/H.
Further, in the third step, in addition it is also necessary at any time monitor start-up of turbine-driven feed pump during parameters, including
In warming-up process of the little machine rotating speed for 1800rpm, safeguard that boiler heat load is stable, drum pressure is stable, ties in little machine warming-up
Shu Hou, boiler start to be slowly increased fuel, thermic load, control the rate of rise, according to furnace side boosting situation, determine whether little machine rises
Speed is to 3200rpm.
Further, the parameters monitoring during start-up of turbine-driven feed pump includes the audition that carries out to unit, vibration measuring,
Once exception occur to report without delay, process in time, it is ensured that steam feed pump normal safe puts into operation.
In the present invention, the feed pump includes two groups of steam feed pumps and one group of electrically driven feed pump, the electronic feedwater
Pump is auxiliary feed water pump.
The present invention directly goes up the mode of water using boiler water filling or Initial Stage after Ignition in unit starting, the little machine of red switch, boiler,
Due to steam feed pump recirculation failure, it is only 70-80T/H that boiler normally goes up discharge, and the present invention is declined by opening boiler
Pipe sewage draining valve and appropriate unlatching boiler water wall lower collecting box blowdown wicket, control whole boiler water filling flow in 150-
160T/H, it is ensured that the feedwater pump discharge for breaking down is in 150-160T/H, it is ensured that the minimum startup flow needed for feedwater pump startup,
The Starting mode traditional by changing unit Important Auxiliary equipment, failure steam feed pump is resumed operation, the reliability of equipment is improve
Property.
The present invention is suitable for the steam feed pump in unit starting and occurs what recirculation pitch catastrophic discontinuityfailure cannot be opened
In the case of, it is ensured that the startup of feed pump safety.Startup, mode of operation due to improving unit Important Auxiliary equipment, optimization fortune
OK, equipment dependability is put forward, economy reduces the fault rate of set auxiliary machinery.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Description of the drawings
Upper Water flow-path schematic diagrams of the Fig. 1 for the present embodiment.
Fig. 2 is the boiler periodical blowdown of the present embodiment, down-comer blowdown, the hydrophobic schematic flow sheet of annular header.
Label in figure：1- deoxygenation water tanks, 2- feed pumps, the first steam feed pumps of 21A-, the second steam feed pumps of 21B-,
21C- electrically driven feed pumps, 22A- the first recirculation pitch, 22B- the second recirculation pitch, the 3rd recirculation pitch of 22C-, on 3-
Water bypass pitch, 4- drums, 5- down-comer sewage draining valves, 6- lower collecting box wickets, 7- annular header hydrophobic valves, 8- arranges thin surely
Water flash vessel.
Specific embodiment
Embodiment
The present embodiment is illustrated by taking one phase of Yiyang power plant, the two 330MW units being mentioned in background technology as an example, its
Three groups of feed pumps 2 are equipped with, it is concrete as shown in figure 1, including the first steam feed pump 21A, the second steam feed pump 21B and electricity respectively
Dynamic feed pump 21C, is connected in parallel deoxygenation water tank 1 and drum 4, and into drum, upper water, is respectively provided with the first recirculation on its pipeline
Pitch 22A, the second recirculation pitch 22B and the 3rd recirculation pitch 22C, are additionally provided with water bypass on the inlet pipeline of drum
Pitch 3, wherein the first steam feed pump 21A and the second steam feed pump 21B is conventional feed pump, electrically driven feed pump 21C is standby
With feed pump, recirculation pitch occur in unit operation bite, valve element come off, the failure such as check-valves when, adopt with the following method
Carry out unit starting.
The first step, selects the little machine of red switch under a suitable drum pressure, by controlling the fuel needed for boiler combustion
Amount, stable boiler heat load, control drum pressure are stable in 1Mpa.Because drum pressure is too high, too low cannot ensure drum
Ordinary water level, cannot also ensure to start minimum discharge needed for feed pump.
Second step, confirms that main frame axle envelope, vacuum system are normal, by little machine red switch to 1800rpm, passes through in warming-up process
Directly to water on drum, other feed pumps adopt standby mode to first steam feed pump 21A, are adjusted by adjusting boiler water filling bypass
Door 3 control boiler water filling flows in 150-160T/H, this is also the minimum safe flow needed for start-up of turbine-driven feed pump, prevent to
Occur during starting mode of pump that the pump housing is overheated, cavitation；
3rd step, at the same furnace side by adjust down-comer blowdown and open that annular header is hydrophobic and front, rear, left and right under
The radical of header wicket, specific boiler down-comer sewage draining valve 5, lower collecting box wicket 6 and annular header hydrophobic valve 7
Flow arrangement mode arrange surely hydrophobic development unit 8 as shown in Fig. 2 drum 4 is connected by four down-comer sewage draining valves 5, in boiler
Water-cooling wall lower collecting box is connected to and determines row's hydrophobic development unit 8 by each eight in front and back and each six roots of sensation lower collecting box wicket in left and right 6, separately
Outer five annular header hydrophobic valves are connected to determines row's hydrophobic development unit 8, by way of strengthening boiler blow-off maintains drum water
Position is normal, it is to avoid steam water-level accident occur, while being conducive to cold conditions in unit starting to rinse and hot flushing, makes water quality as early as possible
Meet unit starting needs.When discharge is less than 150-160T/H on drum, increases lower collecting box wicket radical or open big
Related lower collecting box wicket aperture, it is ensured that upper discharge is stable in 150-160T/H；When on drum, discharge is more than 150-160T/
During H, reduce lower collecting box wicket radical or turn down related lower collecting box wicket aperture, it is ensured that upper discharge is stable in 150-
160T/H。
In above-mentioned start-up course, whole process sends the parameters that special messenger looks over one's shoulder in heat pump start-up course, in little machine
In 1800rpm warming-up processes, safeguard that boiler heat load is stable, drum pressure is stable, and after little machine warming-up terminates, boiler starts to delay
Slow to increase fuel, thermic load controls the rate of rise, and according to furnace side boosting situation, whether raising speed is to 3200RPM to determine little machine,
In little machine from during the entire process of red switch 1800rpm, 1800--3200rpm startup, there is special messenger to carry out audition, vibration measuring on the spot all the time
Deng work is checked, once exception occur reporting without delay, process in time, it is ensured that steam feed pump normal safe puts into operation.
Under the operating mode that steam feed pump recirculation catastrophic failure is not opened, using above-mentioned startup method, while formulating phase
The measure answered, and strict implement, carefully conscientious operation, monitoring, adjustment, it is ensured that feed pump is safe to put into operation.
Embodiment above describes the ultimate principle and principal character and advantages of the present invention of the present invention, the technology of the industry
Personnel it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description this
The concrete operating principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various change and changes
Enter, these changes and improvements are both fallen within scope of the claimed invention, the claimed scope of the invention is by appended right
Claim and its equivalent thereof.
Claims (7)
1. startup method of the fired power generating unit under steam feed pump recirculation failure, it is characterised in that：Start in accordance with the following steps：
The first step, selects drum pressure little machine of red switch under 1.3-2.8Mpa, by controlling the fuel quantity needed for boiler combustion, surely
Determine boiler heat load, in this pressure limit, make drum pressure keep stable as far as possible；
Second step, by little machine red switch to 1800rpm, by steam feed pump directly to water on drum in warming-up process, other
Feed pump adopts standby mode, bypasses pitch control boiler water filling flow by adjusting boiler water filling, it is ensured that steam feed pump is opened
Required minimum safe flow is moved, in preventing feed pump start-up course, occurs that the pump housing is overheated, cavitation；
3rd step, furnace side by adjust down-comer sewage draining valve, and open annular header hydrophobic valve and adjust it is forward and backward,
The radical of left and right lower collecting box blowdown wicket, maintains steam water-level normal, it is to avoid vapour occur by way of strengthening boiler blow-off
Bag water level accident, while being conducive to cold conditions in unit starting to rinse and hot flushing, makes water quality meet unit starting needs as early as possible.
2. startup method of the fired power generating unit according to claim 1 under steam feed pump recirculation failure, little in red switch
Before machine, axle envelope that main frame is confirmed, vacuum system are normal.
3. startup method of the fired power generating unit according to claim 1 under steam feed pump recirculation failure, described second
The minimum safe flow of boiler water filling flow and steam feed pump in step is 150-160T/H.
4. startup method of the fired power generating unit according to claim 3 under steam feed pump recirculation failure, the described 3rd
In step, when discharge is less than 150-160T/H on drum, increases lower collecting box wicket radical or open big correlation lower collecting box and put
Water valve aperture, it is ensured that upper discharge is stable in 150-160T/H；When discharge is more than 150-160T/H on drum, the second line of a couplet is reduced
Case wicket radical turns down related lower collecting box wicket aperture, it is ensured that upper discharge is stable in 150-160T/H.
5. startup method of the fired power generating unit according to claim 1 under steam feed pump recirculation failure, in the 3rd step
In, in addition it is also necessary to the parameters during start-up of turbine-driven feed pump are monitored at any time, are included in the warming-up that little machine rotating speed is 1800rpm
During, safeguard that boiler heat load is stable, drum pressure is stable, after little machine warming-up terminates, boiler start to be slowly increased fuel,
Thermic load, controls the rate of rise, is boosted situation according to furnace side, determine little machine whether raising speed to 3200rpm.
6. startup method of the fired power generating unit according to claim 5 under steam feed pump recirculation failure, steam-operating feedwater
Parameters monitoring during pump startup includes the audition carried out to unit, vibration measuring, once exception occur report without delay, in time
Process, it is ensured that steam feed pump normal safe puts into operation.
7. startup method of the fired power generating unit according to claim 1 under steam feed pump recirculation failure, the feedwater
Pump includes two groups of steam feed pumps and one group of electrically driven feed pump, and the electrically driven feed pump is auxiliary feed water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610232217.4A CN105782948B (en) | 2016-04-14 | 2016-04-14 | Method for starting thermal power generating unit under recycling fault of turbine driven feed water pumps |
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| CN201610232217.4A CN105782948B (en) | 2016-04-14 | 2016-04-14 | Method for starting thermal power generating unit under recycling fault of turbine driven feed water pumps |
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| CN105782948B true CN105782948B (en) | 2017-04-19 |
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| CN108868909B (en) * | 2018-06-29 | 2021-06-29 | 东方电气集团东方汽轮机有限公司 | Starting mode of double-machine regenerative small steam turbine |
| CN109442382B (en) * | 2018-11-30 | 2024-05-14 | 联峰钢铁（张家港）有限公司 | Water supply system of gas power generation boiler |
| CN113007692B (en) * | 2021-02-22 | 2022-07-19 | 西安热工研究院有限公司 | Coal-fired unit whole-process automatic starting control method based on steam-driven water-feeding pump |
| CN113107832B (en) * | 2021-04-25 | 2022-08-26 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113431787B (en) * | 2021-07-30 | 2022-07-08 | 西安热工研究院有限公司 | System for preventing recirculation valve of feed pump from leaking under condition of adapting to frequent peak regulation situation |
| CN114543071A (en) * | 2022-01-11 | 2022-05-27 | 国能浙江宁海发电有限公司 | Water-feeding pump recycling accurate water distribution energy-saving system adaptive to deep peak shaving of steam turbine set |
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| CN102261269A (en) * | 2010-05-28 | 2011-11-30 | 中国神华能源股份有限公司 | Method for controlling operation of low pressure bypass in thermal power generating unit |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000028102A (en) * | 1998-07-14 | 2000-01-25 | Ishikawajima Harima Heavy Ind Co Ltd | Auxiliary steam control method in boiler for thermal electric power generation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261269A (en) * | 2010-05-28 | 2011-11-30 | 中国神华能源股份有限公司 | Method for controlling operation of low pressure bypass in thermal power generating unit |
| CN104153830A (en) * | 2014-06-30 | 2014-11-19 | 华电国际电力股份有限公司山东分公司 | Control method and control system for water feed pump turbine |
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