CN103712197A - Energy-saving type quick start method for supercritical unit or ultra-supercritical unit - Google Patents
Energy-saving type quick start method for supercritical unit or ultra-supercritical unit Download PDFInfo
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Abstract
The invention discloses an energy-saving type quick start method for a supercritical unit or an ultra-supercritical unit. According to the method, steam from another resource is used for heating supplied water so that a boiler can be indirectly heated, and the thermal stress of a heated surface is reduced when the boiler is started so that the heating rate of the boiler can be improved; meanwhile, the heated high-temperature supplied water is converted into steam-liquid two-phase flow through throttling and pressure reduction, the flowing scouring action of the steam-liquid two-phase flow is far superior to the effect of thermal-state washing, and in other words, the boiler can complete thermal-state washing under the non-ignition condition, and can preheat the whole heated surface before ignition till certain pressure is reached. After ignition of the boiler, due to the fact that enthalpy of subcooling on an inlet of a water wall is eliminated, the problem of water power can be readily solved and the input speed of fuel can be increased. Meanwhile, by adjusting the open degree of a turbine bypass valve, the flow, the temperature rising speed and the pressure rising speed of main stream and reheat steam are controlled, and the temperature rising speed of the heated surface of the boiler is increased; when the temperature of the main steam and the temperature of the reheat steam are larger than the temperature of a turbine heating valve, valve heating is started, and a main machine can early satisfy the impulse starting condition.
Description
Technical field
The present invention relates to a kind of energy-saving quick start method of super (super-) critical unit, belong to firepower coal fired power generation unit field.
Background technology
Increasingly mature along with coal-burning power plant's technology, and the improving constantly of the environmental requirement such as energy-saving and emission-reduction, large electric power plant unit generally adopts overcritical and ultra supercritical parameter.The starting method of these units, mainly contains following two kinds: dewatering capacity-enlarging formula and band boiler water circulating pump formula at present.In these two kinds of starting methods, before boiler feed water, need oxygen-eliminating device heating to drop into, feedwater is heated to the upper coolant-temperature gage (generally 105 ℃ of left and right, there is different regulations in different boiler manufacturer to this) of boiler requirement, then to boiler water filling; At boiler water filling, boiler is carried out to cold conditions flushing simultaneously; Startup air and flue system after boiler water quality is qualified starts fuel system and lights a fire after boiler meets ignition condition, and the rear boiler of having lighted a fire carries out increasing temperature and pressure; When water-cooling wall reaches after uniform temperature (be generally 150-190 ℃, there is different regulations in different boiler manufacturer to this), boiler carries out hot cleaning.After boiler water quality is qualified, strengthen fuel quantity, boiler carries out increasing temperature and pressure again, until steam quality qualified and reach certain parameter and require after, warm up valve and operate, after warm valve completes, the temperature and pressure for the treatment of main steam, reheated steam reaches steam turbine red switch requirement, carries out red switch.
In above-mentioned traditional starting method, before igniting, boiler feed water temperature is low, makes each parts temperature difference of initial start stage boiler can be larger, causes thermal stress larger.For this reason, can only slowly increase the input of fuel quantity, the thermic load of restriction burner hearth, and there is minimum air quantity (being generally 30%) in the startup of blower fan, in the situation that burner hearth heat itself is limited, wind can be taken away amount of heat, add economizer, amount of stored heat that water-cooling wall itself is huge, thereby the boiler heating process of boosting is very slow.In addition; in initial start stage; because feed temperature is low; in superheater, reheater, there is no vapor flow, in " dry combustion method " state, even after water-cooling wall temperature surpasses 100 ℃; because furnace load is restricted; the steam flow producing is also less, is protection superheater and reheater, and boiler oil loading speed is also further restricted.And slowly heat up while reaching boiler thermal-state cleaning condition when water-cooling wall, this process also can be consuming time longer, in addition follow-up warm valve process etc., all these, all caused unit to adopt the time of traditional starting method longer, therefore, the consumption of fuel quantity and station service also can be larger.
And, the method that above-mentioned tradition starts, after igniting, lower feed temperature has caused economizer to become huge " cooler ", and smoke evacuation is cooled and causes primary and secondary air effectively not heated at air preheater in economizer, thereby worsened burning condition, because first and second wind-warm syndrome is lower, be difficult for meeting and throw vermicelli part, concerning traditional sparking mode, this certainly will cause combustion-supporting oil mass to increase, and makes start-up cost further increase.
In order to reduce the consumption of boiler startup fuel oil etc., reduce costs, a lot of power plant have started to attempt various New-type boiler sparking mode and have reached while starting and use less the even oilless object of oil, as adopted plasma ignition mode and small oil gun sparking mode.But, adopt after plasma or type of small oil gun burner, do not shorten the unit starting time, just with fire coal, substituted certain fuel oil, but also brought a series of safety problems simultaneously, low such as coal dust burnout rate, thus the safety that jeopardizes the equipment such as boiler tail air preheater; Flame combustion journey is long, directly washes away heating surface, and the superheater, reheater that there is no vapor flow are in " dry combustion method " state, very easily cause the problems such as possible permanent damage of these heating surfaces.
The cold start of common large-scale super (super-) critical unit needs about 8-10 hour to grid-connected from igniting, and the coal consuming in startup, fuel oil, station service are larger.The 900MW supercritical unit of Yi Mou genco is example, and the fuel oil that one-shot consumes, fire coal and station service quantity are as shown in table 1.
The every consumption of table 1900MW supercritical unit cold start
Chinese patent ZL200710046959.9 and ZL200710046960.1 provide " dewatering capacity-enlarging starts the starting method of monotube boiler near steam heating boilers " and " with the starting method of circulating-stove-water pump monotube boiler near steam heating boilers ", on the high-pressure heater of unit to be started, be communicated with a road and have the jet chimney that can receive its source heating steam, be used for the feedwater of heating boiler, indirect heating boiler heating surface, when heating surface metal temperature reaches the temperature difference with the saturation temperature of described its source steam and is less than setting (described setting is to stipulate in rules), strengthen feedwater flow to more than minimum igniting flow, start the air and flue system of boiler, ignition of the boiler, when one, secondary air temperature starts pulverized coal preparation system while meeting throwing vermicelli part, after Steam-water Quality is qualified, vapor (steam) temperature and pressure meet red switch condition, unit red switch.
A kind of method of operation of the hp by-pass system that the people such as Chang Lei have disclosed steam turbine when cold start: before ignition of the boiler, the preset minimum aperture Ymin(20% left and right of high pressure turbine by control valve), guarantee that the steam that boiler produces can flow through superheater and the reheater (research of OTSC Boiler Start-up System and turbine bypass system, < < electric power station system engineering > >, the 21st the 1st phase of volume in 2005).In fact, if do not adopt adjacent vapour mode of heating, at the ignition of the boiler initial stage, because the Temperature of Working in water-cooling wall is lower, the thermal stress of each parts of boiler is larger; Now superheater, reheater still can be in " dry combustion method " states, in order to reduce the thermal stress of each parts of boiler and the infringement that reduction " dry combustion method " causes boiler, the boiler heating rate of rise still can only be very slow, so while adopting the method to start, unit starting time used is still very long, and fuel, plant consumption amount are still huge.
Therefore, in this area, existing fired power generating unit starting method needs to do further improvement at aspects such as security, energy-saving and cost-reducing, toggle speeds.
Summary of the invention
In view of the above-mentioned defect of existing Unit Starting Technology, the object of this invention is to provide the energy-saving quick start-up technique that a kind of reliability is high, start-up time is short, cost is low.
The energy-saving quick start method of a kind of super (super-) critical unit provided by the invention, one of feature: (utilize its source Steam Heating feedwater on the basis of existing " dewatering capacity-enlarging starts the starting method of monotube boiler near steam heating boilers " (patent No. ZL200710046959.9) and " with the starting method of circulating-stove-water pump monotube boiler near steam heating boilers " (patent No. ZL200710046960.1), thereby heating boiler), further regulate economizer inlet valve, make high temperature water-supply form vapour-liquid two phase flow through throttling and hypotensive effect, utilize the strong souring of steam water two phase flow to metal wall, in heating boiler, complete hot cleaning.The cleaning performance of this method is much better than conventional hot flushing, is equivalent to boiler and under the condition misfiring, has just fulfiled hot flushing process ahead of schedule, and complete preheating and reaching certain pressure of whole heating surface, therefore can greatly save the unit starting time.
The energy-saving quick start method of a kind of super (super-) critical unit provided by the invention, two of feature: eliminated all restriction boiler heat loads hydrodynamic force problem, " dry combustion method " problem and the stable combustion problem in factor, especially the low heat loads stage of increase fast.The working medium that advances into water-cooling wall due to igniting is two phase flow, and owing enthalpy is zero, has eliminated hydrodynamic force problem.Meanwhile, the working medium that is two phase flow in water-cooling wall outlet is through steam-water separator, and isolated steam flows into superheater, is flowing into reheater after bypass.Thereby thoroughly stopped " dry combustion method " state of convection heating surface after igniting, therefore can greatly accelerate the input of fuel quantity, particularly Coal-fired capacity after igniting.And before igniting, open give, air-introduced machine is while carrying out furnace purge, by superheater, reheater and the economizer of steam and high-temperature-hot-water heating, become very large incomparable steam air heater, oppositely heated the air that flows out burner hearth, this hot blast has heated again air intake in air preheater, thereby form benign cycle, when ignition of the boiler, just at freeze profile, become the thermal environment of hot blast, hot stove, greatly improved burning condition.For guaranteeing not only fast but also safety, by regulating the aperture of turbine bypass valve, control flow and the increasing temperature and pressure speed of main steam and reheated steam, make it approach as far as possible the limit value that even reaches boiler producer, accelerate the temperature rise rate of boiler heating surface, when main steam and reheat steam temperature are greater than the warm valve temperature of steam turbine, just start warm valve, make main frame early meet red switch condition, thereby can significantly shorten the unit starting time.
The quick start method of a kind of super (super-) critical unit provided by the invention, comprising:
(a), when adopting auxiliary vapour heating oxygen-eliminating device (containing deoxygenation water tank), feed pump is carried out to warming-up;
(b), when feed pump meets after entry condition, start feed pump.Utilize its source steam heated feed water in high-pressure heater; The appropriate economizer inlet valve of opening carries out boiler water filling and boiler is heated, and high temperature water-supply progressively forms vapour-liquid two phase flow after throttling and step-down.Utilize the souring of vapour-liquid two phase flow to metal wall, in heating boiler, complete hot cleaning process;
(c) when feed temperature approaches the heating limit, (saturation temperature corresponding to its source steam pressure) and water-cooling wall outlet reach certain pressure, strengthen feedwater flow to more than minimum igniting flow, start air and flue system, after completing, purging program can carry out furnace fuel oil igniting, because water-cooling wall entrance is without owing enthalpy, without the sorrow of hydrodynamic force, after fuel ignition, can rapidly most of oil gun be dropped into.Then open primary air fan, when a wind-warm syndrome meets throwing vermicelli part, start pulverized coal preparation system, and increase fast coal fuel heating load, when coal fuel heating is loaded higher than minimum oil-break thermic load, cut off fuel oil;
(d) regulate the aperture of steam turbine high and low pressure bypass valve, realize the control of boiler heating rate of pressure rise, when main steam and reheat steam temperature are greater than the warm valve temperature of steam turbine regulation, just start warm valve, make main frame early meet red switch condition.
Preferably, step a can adopt boiler static pressure water feeding mode, utilize pressure energy and itself potential energy in oxygen-eliminating device, do not start feed pump, complete boiler water filling process, because the saturated water temperature in oxygen-eliminating device is far above cold conditions cleaning temperature, cleaning performance can be much better than cold conditions and clean, the hot cleaning process of this alternative part.
Preferably, step b can be by regulating its source steam to enter pressure, the flow of high-pressure heater, to meet the requirement of the heating surface temperature rise rates such as boiler water wall.
Preferably, step b can arrange road pipeline and a booster pump after air suspended type flash vessel drain tank, is connected to oxygen-eliminating device, to reclaim to device of working medium.
Preferably, step b can arrange road pipeline and a control valve after moisture separator drain tank, is connected to oxygen-eliminating device, to reclaim to device of working medium and heat thereof.
Preferably, steps d is controlled flow and the increasing temperature and pressure speed of main steam and reheated steam by controlling turbine bypass valve aperture, makes it approach as far as possible the limit value that even reaches boiler producer.
Preferably, after unit starting to be started, when the pressure that the normal work of self unit is drawn gas reaches its source heating steam pressure, can stop its source heating steam, recover just conventional vapour.
When starting unit and be cold conditions, warm starting, carry out successively above-mentioned in steps.
When starting unit and be hot starting, hot start, step a, b can carry out simultaneously, and then perform step successively c, d.
When starting unit and be very hot startup, described method is also included in when described boiler furnace purges, boiler heating surface is lowered the temperature, utilize its source steam heated feed water in high-pressure heater, when water-cooling wall and the feed temperature temperature difference are less than setting, then perform step successively c, d.
" its source heating steam " mentioned in the present invention refers to from contiguous another unit or steam raising plant.Conventionally capacity is greater than 50MW unit has steam pressure to be about drawing gas (its corresponding saturation temperature is about 245 ℃-275 ℃) of 3.7MPa-6MPa, feedwater can be heated to more than 240 ℃ to the feed temperature startup stage that this just improving greatly with drawing gas of this pressure.
The energy-saving quick start method of a kind of super (super-) critical unit provided by the invention, tool has the following advantages:
1, the ignition of the boiler last stage.Using feedwater as heat carrier, by its source Steam Heating, feed water, by boiler homogeneous heating to higher temperature, be equivalent to make the boiler circuit of boiler to transfer hot starting, hot start to by cold start, before the increasing temperature and pressure process at ignition of the boiler initial stage in conventional starting method is mentioned to ignition of the boiler, complete, thereby greatly saved start-up time in this stage; Then utilize economizer inlet valve to carry out throttling and make it to become vapour-liquid two phase flow entering the high temperature water-supply of boiler, because two phase flow is far superior to single-phase current to washing away with cleaning action of metal surface dirt, therefore actual cleaning performance will be much better than traditional hot cleaning way, be about in conventional starting method before the hot flushing link of boiler is mentioned ignition of the boiler complete, therefore relatively saved again the start-up time of this link, because the developing result of two phase flow is good, also can shorten washing time, relatively save the wash cycles water yield; Meanwhile, vapour-liquid two phase flow carries out separation at steam-water separator, and isolated steam enters superheater and reheater, has avoided " dry combustion method " of these convection heating surfaces, is conducive to device security and accelerates the input of fuel quantity; In addition, boiler heating surface evenly reaches higher temperature in igniting the last stage, thereby the thermal stress of heating surface can reduce boiler startup when igniting time, and the enthalpy of owing of water-cooling wall entrance is eliminated, and hydrodynamic force problem is also readily solved.
For conventional Starting mode, even very hot startup, due to inflow temperature 105 ℃ of left and right only, make economizer become very large " gas cooler ", the flue-gas temperature that flows out economizer is reduced greatly, also make the outlet wind-warm syndrome of Initial Stage after Ignition air preheater greatly reduce, greatly worsened the burner hearth combustion stability of low load stage.And adopt after this Starting mode, before igniting, open give, air-introduced machine is while carrying out furnace purge, by superheater, reheater and the economizer of steam and high-temperature-hot-water heating, become very large incomparable steam air heater, oppositely heated the air that flows out burner hearth, this hot blast has heated again air intake in air preheater, thereby forms benign cycle, when ignition of the boiler, just at freeze profile, become the thermal environment of hot blast, hot stove, greatly improved burning condition.All these lays the foundation for the lifting of follow-up ignition of the boiler stage fuel loading speed.
2, the ignition of the boiler stage.Owing to just having eliminated such as boiler hot stress large in the ignition of the boiler last stage, hydrodynamic force is poor, without steam or steam flow, wait less the zooming factor of boiler heat load that limits in convection heating surface, therefore, this stage can fast lifting boiler heating surface temperature rise rate, at Initial Stage after Ignition, by fuel oil, promote boiler heat load, because superheater has just first been heated in feedwater when the radiator, reheater and economizer, make it to become huge " steam air heater ", superheater is passed through in smoke evacuation successively, reheater and economizer are heated, and heated wind one time by air preheater, Secondary Air, thereby, in short time, can meet and throw vermicelli part, greatly shortened and thrown the oil time, saved amount of fuel, and igniting and the steady combustion condition of boiler have greatly been improved, improved start-up safety.Subsequently, at boiler heating, boost in process, for guaranteeing not only fast but also safety, by regulating the aperture of turbine bypass valve, control flow and the increasing temperature and pressure speed of main steam and reheated steam, make it approach as far as possible the limit value that even reaches boiler producer, when main steam and reheat steam temperature are greater than the warm valve temperature of steam turbine, just begin to warm up valve, make main frame early meet red switch condition.
To sum up, thereby the energy-saving quick start method of a kind of super (super-) critical unit provided by the invention can significantly shorten the unit starting time, reduce in start-up course the consumption such as fuel, station service, reduce unit starting cost.And can greatly improve unit starting and device security.
Below with reference to accompanying drawing, the technique effect of design of the present invention, concrete structure and generation is described further, to understand fully object of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the first specific embodiment schematic diagram of the present invention.
Fig. 2 is the second specific embodiment schematic diagram of the present invention.
Fig. 3 is the 3rd specific embodiment schematic diagram of the present invention.
Wherein, the auxiliary steam control valve of 1-; 2-oxygen-eliminating device; 3-warming-up door; 4-feed pump; Its source heating steam control valve of 5-; 6-high-pressure heater; 7-economizer inlet valve; 8-economizer; 9-reheater; 10-superheater; 11-boiler; 12-water-cooling wall; 13-steam-water separator; 14-moisture separator drain tank; 15-control valve; 16-air suspended type flash vessel and drain tank; 17-high pressure turbine by control valve; 18-low voltage bypass control valve; 19-high pressure cylinder; 20-intermediate pressure cylinder; 21-low pressure (LP) cylinder; 22-condenser; 23-generator; 24-control valve; 25-booster pump.
The specific embodiment
Using that certain adopts the ultra supercritical unit of single reheat, dewatering capacity-enlarging formula as the first embodiment below; (the energy-saving quick start method of patent of the present invention is equally applicable to adopt the unit of double reheat, boiler water circulating pump formula to specifically describe the energy-saving quick start method of super (super-) critical unit of the present invention; list no longer separately herein; but should be all in scope of patent protection of the present invention), as shown in Figure 1.The super (super-) critical unit is here the habitual address of the industry, for representing supercritical unit and ultra supercritical unit.
In this first specific embodiment, its source steam pressure is 6MPa.Its concrete starting method comprises the following steps:
After step 1, oxygen-eliminating device 2 water inlets containing deoxygenation water tank, open auxiliary steam control valve 1 and utilize the feedwater in auxiliary vapour heating oxygen-eliminating device 2; , open to pump warming-up door 3 meanwhile, feed pump 4 is carried out to warming-up;
The aperture of step 4, adjusting turbine high-pressure bypass valve 17, low voltage bypass control valve 18, realize the control of boiler heating rate of pressure rise, make it press close to the speed limit value of boiler regulation, when main steam and reheat steam temperature are greater than the warm valve temperature of steam turbine regulation, just start warm valve, make main frame early meet red switch condition.
Preferably, wherein said step (b) before, adopt boiler static pressure water feeding mode, utilize pressure energy and itself potential energy in oxygen-eliminating device, do not start feed pump, complete boiler water filling process, because the saturated water temperature in oxygen-eliminating device is far above cold conditions cleaning temperature, cleaning performance can be much better than cold conditions and clean, the hot cleaning process of this alternative part.In addition, step b can be by regulating its source steam to enter pressure, the flow of high-pressure heater, to meet the requirement of the heating surface temperature rise rates such as boiler water wall.
Adopt after starting method of the present invention, in three cold start of certain 1000MW of power plant unit, every consumption figures is as shown in table 2.
Every consumption figures when table 2 adopts unit cold start after energy-saving quick start method
Table 3 has provided the comparison that adopts the energy-saving quick start method of the present invention front and back parameters, therefrom can find out, adopts after quick start method of the present invention, and energy-conservation, the consumption reduction effect of unit are very obvious.
Table 31000MW unit adopts the comparison of energy-saving quick start method and 900MW unit tradition starting method
If Fig. 2 is the second specific embodiment of the present invention, the method for the present embodiment and above-mentioned the first embodiment is basic identical, and difference has been to set up air suspended type flash vessel and drain tank 16 to pipeline and the booster pump on pipeline 25 of oxygen-eliminating device 2, to reclaim to device of working medium.So preferably, step b can arrange road pipeline and a booster pump after air suspended type flash vessel drain tank, is connected to oxygen-eliminating device, to reclaim to device of working medium.
Fig. 3 is the 3rd specific embodiment of the present invention, and the difference of the present embodiment and Fig. 1 is, is to have set up pipeline and control valve pipeline on 24 of moisture separator drain tank 14 to oxygen-eliminating device 2, to reclaim to device of working medium and heat.Relative Fig. 2, the present embodiment is the recyclable device of working medium of giving not only, also recyclable part feedwater heat, but needing to adopt the control valve 24 of high pressure, initial cost can increase relatively.So preferably, step b can arrange road pipeline and a control valve after moisture separator drain tank, is connected to oxygen-eliminating device, to reclaim to device of working medium and heat thereof.
Preferably, steps d is controlled flow and the increasing temperature and pressure speed of main steam and reheated steam by controlling turbine bypass valve aperture, makes it approach as far as possible the limit value that even reaches boiler producer.
Preferably, after unit starting to be started, when the pressure that the normal work of self unit is drawn gas reaches its source heating steam pressure, can stop its source heating steam, recover just conventional vapour.
Wherein when described in when starting unit and be cold conditions, warm starting, carry out successively above-mentioned steps.
Wherein when described in when starting unit and be hot starting, hot start, step a, b can carry out simultaneously, and then perform step successively c, d.
When starting unit and be very hot startup, described method is also included in when described boiler furnace purges, boiler heating surface is lowered the temperature, utilize its source steam heated feed water in high-pressure heater, when water-cooling wall and the feed temperature temperature difference are less than setting, then perform step successively c, d.
" its source heating steam " mentioned in the present invention refers to from contiguous another unit or steam raising plant.Conventionally capacity is greater than 50MW unit has steam pressure to be about drawing gas (its corresponding saturation temperature is about 245 ℃-275 ℃) of 3.7MPa-6MPa, feedwater can be heated to more than 240 ℃ to the feed temperature startup stage that this just improving greatly with drawing gas of this pressure.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just can design according to the present invention make many modifications and variations without creative work.Therefore, all technical staff in the art, all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (11)
1. an energy-saving quick start method for super (super-) critical unit, wherein said method comprises:
(a), when adopting auxiliary vapour heating to contain the oxygen-eliminating device of deoxygenation water tank, feed pump is carried out to warming-up;
(b) when feed pump meets after entry condition, start feed pump, utilize its source steam heated feed water in high-pressure heater; The appropriate economizer inlet valve of opening carries out boiler water filling and boiler is heated, and high temperature water-supply forms vapour-liquid two phase flow after throttling and step-down, utilizes the souring of vapour-liquid two phase flow to metal wall, completes hot cleaning process in heating boiler;
(c) when feed temperature approaches saturation temperature corresponding to its source steam pressure, and water-cooling wall outlet reaches certain pressure, strengthen feedwater flow to more than minimum igniting flow, start air and flue system, after purging program completes, can carry out furnace fuel oil igniting, after fuel ignition, oil gun is dropped into, then open primary air fan, when a wind-warm syndrome meets throwing vermicelli part, start pulverized coal preparation system, and increase coal fuel heating load, when coal fuel heating is loaded higher than minimum oil-break thermic load, cut off fuel oil;
(d) regulate the aperture of steam turbine high and low pressure bypass valve, realize the control of boiler heating rate of pressure rise, when main steam and reheat steam temperature are greater than the warm valve temperature of steam turbine regulation, just start warm valve.
2. starting method as claimed in claim 1, preferably, wherein said step (b) before, adopts boiler static pressure water feeding mode.
3. starting method as claimed in claim 1, preferably, step b can be by regulating its source steam to enter pressure, the flow of high-pressure heater, to meet the requirement of the heating surface temperature rise rates such as boiler water wall.
4. starting method as claimed in claim 1, preferably, step b can arrange road pipeline and a booster pump after air suspended type flash vessel drain tank, is connected to oxygen-eliminating device, to reclaim to device of working medium.
5. starting method as claimed in claim 1, preferably, step b can arrange road pipeline and a control valve after moisture separator drain tank, is connected to oxygen-eliminating device, to reclaim to device of working medium and heat thereof.
6. starting method as claimed in claim 1, preferably, steps d is controlled flow and the increasing temperature and pressure speed of main steam and reheated steam by controlling turbine bypass valve aperture, makes it approach as far as possible the limit value that even reaches boiler producer.
7. starting method as claimed in claim 1, preferably, after unit starting to be started, when the pressure that the normal work of self unit is drawn gas reaches its source heating steam pressure, can stop its source heating steam, recovers just conventional vapour.
8. starting method as claimed in claim 1, wherein when described in when starting unit and be cold conditions, warm starting, carry out successively above-mentioned steps.
9. starting method as claimed in claim 1, wherein when described in when starting unit and be hot starting, hot start, step a, b can carry out simultaneously, and then perform step successively c, d.
10. starting method as claimed in claim 1, when when starting unit and be very hot startup, described method is also included in when described boiler furnace purges, boiler heating surface is lowered the temperature, utilize its source steam heated feed water in high-pressure heater, when water-cooling wall and the feed temperature temperature difference are less than setting, then perform step successively c, d.
11. starting methods as claimed in claim 1, described its source heating steam refers to from contiguous another unit or steam raising plant.
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| CN106401663B (en) * | 2016-11-25 | 2018-04-10 | 江苏中能电力设备有限公司 | A kind of steam turbine quick start system and method based on intelligent temperature control |
| CN106642062A (en) * | 2016-12-13 | 2017-05-10 | 湖南华电长沙发电有限公司 | Beryllium oxide generation preventing method for boilers of power plant |
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| CN111256105B (en) * | 2020-01-20 | 2022-01-07 | 上海发电设备成套设计研究院有限责任公司 | Micro-furnace heating system and method for quickly starting ultra-supercritical unit |
| CN111593355A (en) * | 2020-05-12 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for cleaning boiler of thermal power plant |
| CN111649312A (en) * | 2020-06-08 | 2020-09-11 | 上海申能电力科技有限公司 | System and method for starting adjacent steam heating boiler of drum boiler |
| CN114777099A (en) * | 2022-04-12 | 2022-07-22 | 江西江投电力技术与试验研究有限公司 | Multi-parameter coupled once-through boiler blow pipe steam control method |
| CN114777099B (en) * | 2022-04-12 | 2024-02-23 | 江西江投能源技术研究有限公司 | Multi-parameter coupling type steam control method for blowpipe of once-through boiler |
| CN115180707A (en) * | 2022-07-06 | 2022-10-14 | 深圳市华尔信环保科技有限公司 | Supercritical water oxidation system and method capable of being started quickly |
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