CN202188482U - Pumpless direct-current furnace startup system capable of fully recycling working media and heat - Google Patents

Pumpless direct-current furnace startup system capable of fully recycling working media and heat Download PDF

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CN202188482U
CN202188482U CN2011201838304U CN201120183830U CN202188482U CN 202188482 U CN202188482 U CN 202188482U CN 2011201838304 U CN2011201838304 U CN 2011201838304U CN 201120183830 U CN201120183830 U CN 201120183830U CN 202188482 U CN202188482 U CN 202188482U
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pressure
valve
startup
water
direct current
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章礼道
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Abstract

The utility model provides a pumpless direct-current furnace startup system capable of fully recycling working media and heat, which is used for a power station supercritical direct-current furnace and free of a startup furnace water circulation pump. During startup of a direct-current furnace, high voltage heaters on a steam turbine side are adopted as a water heat exchanger. High enthalpy value startup discharge water gradually releases heat, reduces pressure and reduces the enthalpy value until being suitable for safe recycling by a deaerator. Specially designed double-set control logics of a machine set data communication system (DCS) on the high voltage heaters ensure that the high voltage heaters can safely and economically work under two working modes. A transition expansion pipeline and a valve are arranged to reduce requirements for communication capability of a high pressure casing side and a high pressure discharge water regulating valve. The working media and heat can be comprehensively recycled in an overall startup process under any working condition, and the recycling effect is better than a direct-current furnace startup system with the startup furnace water circulation pump. The startup furnace water circulation pump and auxiliary systems of the startup furnace water circulation pump are abandoned so as to greatly reduce basic construction investment and cost of operation and maintenance.

Description

Can reclaim the no pump direct current stove start-up system of working medium and heat comprehensively
(1) technical field:
The no pump direct current stove start-up system that the utility model can reclaim working medium and heat comprehensively relates to that nothing that a kind of power station supercritical DC furnace uses starts boiler water circulating pump and the direct current stove start-up system that can comprehensively reclaim working medium and heat.
(2) background technology:
The power station supercritical DC furnace start-up system of prior art is an important component part of power station supercritical once-through boiler; The purpose that start-up system is set is in boiler startup, underrun and furnace shutting down process; Set up and keep the minimum mass flow in the water-cooling wall through start-up system, with protection water-cooling wall safety; Satisfy unit safety, economic start and stop simultaneously; The unit underrun reaches carries out accident treatment apace, and realizes the requirement of working medium and heat recovery as far as possible.
What the power station direct current stove start-up system of prior art was commonly used has 4 kinds:
A has the startup boiler water circulating pump, and the direct current stove start-up system of air suspended type dewatering capacity-enlarging device, drain tank, drainage pump is arranged.(Fig. 1)
B has the startup boiler water circulating pump, the direct current stove start-up system of the hydrophobic in line condenser of boiler startup.(Fig. 2)
C does not have the startup boiler water circulating pump, and the direct current stove start-up system of air suspended type dewatering capacity-enlarging device, drain tank, drainage pump is arranged.(Fig. 3)
D does not have the startup boiler water circulating pump, the direct current stove start-up system of the hydrophobic in line condenser of boiler startup.(Fig. 4)
A kind direct current stove start-up system is when starting the boiler water circulating pump operate as normal; It is generally acknowledged; Except that the direct current stove crosses a few minutes of the phase of expansion, can reclaim working medium and heat comprehensively, but in fact in order to make separator water level control valve and corresponding pipeline, valve exempt from excessive thermal shock; Be admitted to air suspended type dewatering capacity-enlarging device from direct current furnace igniting begin to have an appointment 20% startup flow always, this part working medium and heat have basically all lost; Still can clean boot direct current stove when starting the boiler water circulating pump fault, but deteriorated to C kind direct current stove start-up system.
B kind direct current stove start-up system is when starting the boiler water circulating pump operate as normal; It is generally acknowledged; Except that the direct current stove crosses a few minutes of the phase of expansion, can reclaim working medium and heat comprehensively, but in fact in order to make separator water level control valve and corresponding pipeline exempt from excessive thermal shock; Be admitted to condenser from direct current furnace igniting begin to have an appointment 20% startup flow always, this part heat basic loss has fallen; Still can clean boot direct current stove when starting the boiler water circulating pump fault, but deteriorated to D kind direct current stove start-up system.
C kind direct current stove start-up system is when being furnished with liquid level control bypass valve, and few part operating mode can reclaim working medium and heat; During the hydrophobic entering air suspended type of boiler startup dewatering capacity-enlarging device, can receive serious iron pollution, this moment, not only heat can not reclaim but also working medium also should not reclaim; Because air suspended type dewatering capacity-enlarging device generally is arranged in the boiler structure or near, the later pipeline of air suspended type dewatering capacity-enlarging device outlet is low pressure pipeline, is easy to arrange, is easy to hang, and makes A kind and C kind direct current stove start-up system once obtain more employing; Because misgivings oxygen-eliminating device superpressure, A kind and the C kind direct current stove start-up system quantity of being furnished with liquid level control bypass valve are seldom.
D kind direct current stove start-up system is when being furnished with liquid level control bypass valve, and few part operating mode can reclaim working medium and heat; The hydrophobic in line condenser of boiler startup does not have iron pollution, and recyclable whole working medium can not reclaim heat.B kind and D kind direct current stove start-up system obtain more employing in recent years; Because misgivings oxygen-eliminating device superpressure, B kind and the D kind direct current stove start-up system quantity of being furnished with liquid level control bypass valve are seldom.
C kind and D kind direct current stove start-up system are when being furnished with liquid level control bypass valve; Few part operating mode can reclaim working medium and heat; The representative condition that liquid level control bypass valve allows to open is that oxygen-eliminating device pressure is not higher than that 0.5MPa, steam-water separator pressure are not higher than 11.0MPa, the steam-water separator water level is not less than three conditions of 2.7m and satisfies simultaneously, to guarantee oxygen-eliminating device safety.
High-pressure heater is the part of power station steam turbine group heat regenerative system, is used to reduce the cold junction loss of power station thermodynamic cycle, improves thermal efficiency of power plant.That the typical high-pressure heater of prior art is generally is horizontal, U-shaped heat-transfer pipe, shell-and-tube heat exchanger; 3 grades of arranged in series accept respectively that steam turbine high-pressure cylinder draws gas, high pressure cylinder steam discharge, intermediate pressure cylinder prime draw gas, and is used for the boiler feedwater of heated feed water pump discharge step by step.The hydrophobic of high-pressure heater refluxed step by step; The hydrophobic oxygen-eliminating device that is back to of No. 3 high-pressure heaters; The hydrophobic outlet of every high-pressure heater all is furnished with the outlet drain regulating valve, receives unit DCS (dcs) monitoring, in order to the hydrophobic water level of regulating each high-pressure heater of control at target interval; Make the energy-saving effect maximization of heat regenerative system and prevent turbine water induction, guarantee steam turbine safety, economical operation.
High-pressure heater is usually with the steam turbine host-initiated.The common sliding pressure operation of oxygen-eliminating device.
It is the phenomenon that the steam-water separator water level that when water screen system begins to steam, occurs jumps, the hydrophobic pulsed of boiler startup increases that water-cooling wall crosses expansion; Its reason is that working medium severe descends fast in the water screen system; It is a kind of transient process; About 3,4 minutes of duration, the hydrophobic incremental integration value of boiler startup is 30 to 50t to 1000MW grade direct current stove representative value.
(3) summary of the invention:
Technical problem to be solved:
Of background technology; A kind and B kind are furnished with the direct current stove start-up system that starts boiler water circulating pump can reclaim working medium and heat comprehensively; But start boiler water circulating pump system operate as normal for making, need be provided with start boiler water circulating pump recirculation subsystem, start boiler water circulating pump warming-up subsystem, start boiler water circulating pump inlet subcooled water subsystem, start boiler water circulating pump high pressure washing and moisturizing subsystem, start boiler water circulating pump low pressure cooling water subsystem, 6kV station-service electric power system, DCS control system; Starting boiler water circulating pump need work under supercritical pressure and hot conditions; Domesticly still can not produce; 2 1000MW grade units are provided with and start boiler water circulating pump and subsystem thereof, and the power station investment increases by 2,000 ten thousand yuan approximately, also will drop into inspection up to a million, maintenance, recondition expense every year in addition.Be furnished with the start-up system that starts boiler water circulating pump and begin from ignition of the boiler, cross finish always to have an appointment 20% the startup flow of expanding up to water-cooling wall and be admitted to air suspended type flash vessel or condenser, the heat of this part working medium can not reclaim.
Therefore, can find a kind ofly need not start the direct current stove start-up system that boiler water circulating pump can reclaim working medium and heat again comprehensively substantial economics is arranged, be the great technological progress in direct current stove start-up system field, power station.
Solve the technical scheme that its technical problem adopts:
The purpose of the utility model provides a kind of no pump direct current stove start-up system that can comprehensively reclaim working medium and heat.
The utility model comprises steam-water separator (6); Steam-water separator water storage tank (7); Water storage tank outlet shutoff valve (42); Water storage tank level control valve (31); No. 1 high admission stop valve (39) that adds; No. 2 high admission stop valves (40) that add; No. 3 high admission stop valves (41) that add; No. 1 high-pressure heater (44); No. 2 high-pressure heaters (45); No. 3 high-pressure heaters (46); No. 1 high drain regulating valve (47) that adds; No. 2 high drain regulating valves (48) that add; No. 3 high drain regulating valves (49) that add; Oxygen-eliminating device (22); Deaerator exhaust valve (50); Cross expansion pipeline stop valve (51); Cross expansion pipeline control valve (52) and unit DCS; The hydrophobic outlet of startup of steam-water separator water storage tank (7) is connected with the shell-side inlet of No. 1 high-pressure heater (44) through water storage tank outlet shutoff valve (42), water storage tank level control valve (31); No. 1 high adds drain regulating valve (47) outlet and is connected with the shell-side inlet of No. 2 high-pressure heaters (45); No. 2 high adds drain regulating valve (48) outlet and is connected with the shell-side inlet of No. 3 high-pressure heaters (46); No. 3 high adds drain regulating valve (49) outlet and is connected with the hydrophobic import of startup of oxygen-eliminating device (22); Feed pump (15) inlet is connected with the delivery port of oxygen-eliminating device (22); Feed pump outlet valve (14) is connected with the feed-water inlet of No. 3 high-pressure heaters (46); The water out of giving of No. 1 high-pressure heater (44) is connected with the inlet of economizer (5); Crossing expansion pipeline stop valve (51) is connected with the hydrophobic inlet of startup of oxygen-eliminating device (22) through crossing expansion pipeline control valve (52).
Cross expansion pipeline stop valve (51) for having the stop valve of 12MPa bearing capacity; Cross expansion pipeline control valve (52) for having the control valve of 12MPa bearing capacity.
Water storage tank level control valve (31) is a cage balance valve core control valve, waits hundred parts of ratio characteristics, and shell can bear supercritical pressure, and its Kv value should guarantee can be through the flow of very hot startup 30%BMCR during for 0.5MPa at its inlet outlet pressure differential.
The import of drawing gas of No. 1 high-pressure heater (44) is provided with is enough to bear the hydrophobic impact of boiler startup, can not damage the strike plate of U type pipe group.
No. 1 high-pressure heater (44) has when very hot startup 30%BMCR flow passes through, and the shell pressure of No. 1 high-pressure heater (44) is not more than the hydrophobic outlet flow area of 8MPa; No. 1 high-pressure heater (44) has at the thickness of shell of 300 ℃ of following bearing capacities greater than 11.25MPa.
No. 2 high-pressure heaters (45) have when very hot startup 30%BMCR flow passes through, and the shell pressure of No. 2 high-pressure heaters (45) is not more than the hydrophobic outlet flow area of 5.8MPa; No. 2 high-pressure heaters (45) have at the thickness of shell of 280 ℃ of following bearing capacities greater than 8.12MPa.
No. 3 high-pressure heaters (46) have when very hot startup 30%BMCR flow passes through, and the shell pressure of No. 3 high-pressure heaters (46) is not more than the hydrophobic outlet flow area of 2.5MPa; No. 3 high-pressure heaters (46) have at the thickness of shell of 250 ℃ of following bearing capacities greater than 3.5MPa.
Oxygen-eliminating device (22) is a built-in deaerator, the highest permission operating pressure 2.0MPa; Oxygen-eliminating device (22) is provided with and crosses expansion pipeline inlet.
The import of deaerator exhaust valve (50) is connected with the steam drain of oxygen-eliminating device (22); The outlet of deaerator exhaust valve (50) is connected with the low voltage bypass inlet of condenser (25); Oxygen-eliminating device decompression exhaust steam valve (50) is at inlet pressure 1.5MPa, and outlet pressure can be through the flow of 0.075BMCR during for 0.7MPa.
Unit DCS respectively with steam-water separator (6); Steam-water separator water storage tank (7); Water storage tank outlet shutoff valve (42); Water storage tank level control valve (31); No. 1 high admission stop valve (39) that adds; No. 2 high admission stop valves (40) that add; No. 3 high admission stop valves (41) that add; No. 1 high-pressure heater (44); No. 2 high-pressure heaters (45); No. 3 high-pressure heaters (46); No. 1 high drain regulating valve (47) that adds; No. 2 high drain regulating valves (48) that add; No. 3 high drain regulating valves (49) that add; Oxygen-eliminating device (22); Deaerator exhaust valve (50); Cross expansion pipeline stop valve (51); Crossing expansion pipeline control valve (52) connects; Unit DCS highly adds that drain regulating valve (47), No. 2 highly add drain regulating valve (48), No. 3 high drain regulating valves (49) that add dispose 2 cover Different control logic modules to No. 1.
Different with the said A kind of background technology, B kind direct current stove start-up system; Do not use the hydrophobic method of returning the economizer inlet of startup that starts the outlet of boiler water circulating pump supercharging steam-water separator water storage tank to reclaim working medium and heat; But the high-pressure heater of 3 series connection of postponement steamer pusher side is as the enabled instruction of power station steam turbine group heat regenerative system; 3 series connection high-pressure heaters with the steamer pusher side between the power station supercritical DC furnace starting period are used as the water water heat exchanger; At shell-side, the direct current stove is started hydrophobic echelon pressure and temperature reducing, high enthalpy starts and gets into oxygen-eliminating device after hydrophobic echelon is emitted heat; In the pipe side, after absorbing heat, the high-pressure feed water echelon of the feed pump outlet of low enthalpy gets into economizer.Because the exchange capability of heat of 3 high-pressure heaters is by the 100%BMCR flow design; The heat exchange area that has enormous quantity; The direct current stove starts hydrophobic flow from the minimum dc load of boiler band of lighting a fire; The flow mobility scale is 0 to 30%BMCR, and when 3 series connection high-pressure heaters were used as the water water heat exchanger, terminal temperature difference can be no more than 10K.
When high-pressure heater is used as the water water heat exchanger between the direct current stove starting period; What pipe sidled is the high-pressure feed water of feed pump outlet; What shell-side was walked is that boiler startup is hydrophobic, from the ignition of the boiler to the water-cooling wall, crosses the preceding pipe effluent amount that expands and equates basically that with the shell-side flow oxygen-eliminating device pressure slowly rises; Water-cooling wall crosses the back of expanding accomplish boiler and change full direct current operating mode over to start-up course before, it is constant to manage the effluent amount, the shell-side flow starts hydrophobic amount by maximum and drops to 0 gradually, and is corresponding, oxygen-eliminating device pressure is dropped to by climbing speed and stops to rise to slow decline; Only water-cooling wall cross expansion a few minutes inner casing effluent amount quite greater than pipe effluent amount, if be again under very hot attitude operating mode, to start, oxygen-eliminating device pressure might fast rise, takes following measures for guaranteeing the oxygen-eliminating device safe operation:
Oxygen-eliminating device was kept low water level before water-cooling wall crossed and expands, and crossed a few minutes inter-sync of expansion at water-cooling wall and advanced to hang down the enthalpy condensate;
Separator was kept low water level before water-cooling wall crossed and expands;
Select built-in deaerator for use, the oxygen-eliminating device maximum allowable working pressure is brought up to 2.0MPa;
Connect a pipeline to condenser low voltage bypass inlet from the oxygen-eliminating device air removal section, on quck-opening valve is installed, control oxygen-eliminating device pressure;
Adopt above 4 measures simultaneously.
Increase to be provided with and cross expansion pipeline stop valve (51) and cross expansion pipeline control valve (52), can reduce requirement the through-current capability of 3 high-pressure heater shell-sides and 3 high-pressure heater drain regulating valves.
Very hot startup is the operating mode that most probable causes the oxygen-eliminating device superpressure; Like this; No matter cold start, warm starting, hot starting, hot start, very hot startup all can be safely with starting hydrophobic introducing oxygen-eliminating device; Reclaim working medium and heat in the supercritical DC furnace start-up course of power station comprehensively, obtain than be furnished with the effect that the direct current stove start-up system that starts boiler water circulating pump better more comprehensively reclaims working medium and heat.
High-pressure heater is to guarantee that high-pressure heater admission stop valve and high-pressure heater admission non-return valve are tight not leak and can real-time verification as the necessary condition of water water heat exchanger between the direct current stove starting period, each high-pressure heater admission stop valve and high-pressure heater admission non-return valve state of the art well, be provided with pressure sensor between each high-pressure heater admission stop valve and the high-pressure heater admission non-return valve and observable drain valve can satisfy this condition.
Check and revise flow area and the Kv value of separator water level control valve (31) of the import of drawing gas of No. 1 high-pressure heater (44); Guarantee that when very hot startup 30%BMCR flow passes through steam-water separator (6) is no more than 1.0MPa with the pressure reduction of No. 1 high-pressure heater (44) shell-side.Inspection confirms that the draw gas strike plate of import of No. 1 high-pressure heater (44) is enough to bear the hydrophobic impact of boiler startup, can not damage U type pipe group, in case of necessity the reinforcement strike plate.The hydrophobic outlet flow area, No. 1 of checking and revise No. 1 high-pressure heater (44) be high to add the Kv value of drain regulating valve (47) and the height of No. 2 high-pressure heaters (45) adds hydrophobic inlet flow area; Guarantee that the shell pressure of No. 1 high-pressure heater (44) is not higher than 8MPa when very hot startup 30%BMCR flow passes through; The hydrophobic outlet flow area, No. 2 of checking and revise No. 2 high-pressure heaters (45) be high to add the Kv value of drain regulating valve (48) and the height of No. 3 high-pressure heaters (46) adds hydrophobic inlet flow area; Guarantee that the shell pressure of No. 2 high-pressure heaters (45) is not higher than 5.8MPa when very hot startup 30%BMCR flow passes through; The hydrophobic outlet flow area, No. 3 of checking and revise No. 3 high-pressure heaters (46) be high to add the Kv value of drain regulating valve (49) and the height of oxygen-eliminating device (22) adds hydrophobic inlet flow area; Guarantee that the shell pressure of No. 3 high-pressure heaters (46) is not higher than 2.5MPa when very hot startup 30%BMCR flow passes through.No. 1 high adds that drain regulating valve (47), No. 2 are high to add that drain regulating valve (48), No. 3 are high to add hundred parts of ratio characteristics such as drain regulating valve (49) is.
Get the allowable stress under 300 ℃, check the highest safe bearing capacity of No. 1 high-pressure heater (44) shell-side, should be greater than 11.25MPa; Get the allowable stress under 280 ℃, check the highest safe bearing capacity of No. 2 high-pressure heaters (45) shell-side, should be greater than 8.12MPa; Get the allowable stress under 250 ℃, check the highest safe bearing capacity of No. 3 high-pressure heaters (46) shell-side, should be greater than 3.5MPa.In case of necessity, increasing each high-pressure heater thickness of shell can check through this casing rigidity safety until each high-pressure heater.
Control logic when the control logic of the outlet drain regulating valve of high-pressure heater when high-pressure heater is used as the water water heat exchanger is used as heat regenerative system with high-pressure heater is different fully; Unit DCS (dcs) must have 2 cover Different control logics, switches in good time.When the water water heat exchanger, the outlet drain regulating valve of No. 1 high-pressure heater is used to control the pressure differential between No. 1 high-pressure heater shell-side and No. 2 high-pressure heater shell-sides at high-pressure heater; The outlet drain regulating valve of No. 2 high-pressure heaters is used to control the pressure differential between No. 2 high-pressure heater shell-sides and No. 3 high-pressure heater shell-sides; The outlet drain regulating valve of No. 3 high-pressure heaters is used to control the pressure differential between No. 3 high-pressure heater shell-sides and the oxygen-eliminating device.Outlet drain regulating valve with each high-pressure heater is the shell pressure of the adjusting target of governor motion for each corresponding high-pressure heater; Regulate desired value and oxygen-eliminating device pressure immediately, steam-water separator pressure is relevant; The shell pressure desired value of No. 1 high-pressure heater subtracts 1.0MPa for steam-water separator pressure, and the shell pressure desired value of No. 3 high-pressure heaters adds 1.0MPa for oxygen-eliminating device pressure; It is poor that the shell pressure desired value of No. 2 high-pressure heaters is that No. 3 high-pressure heater shell pressures add No. 1 high-pressure heater and No. 3 high-pressure heater shell pressures of 0.6 times.Control logic when above-mentioned high-pressure heater is used as the water water heat exchanger its objective is to make the heat maximization that starts between hydrophobic and the high-pressure feed water under the premise that security is guaranteed.
Steam-water separator pressure is got 6MPa respectively to 9MPa when cold start, warm starting, hot starting, hot start, very hot startup, and cold start is got than low value, and very hot startup is got high value, and warm starting, hot starting, hot start are got median; Steam-water separator pressure can be used the aperture and the fuel quantity control of high and low pressure bypass valve in the start-up course.
Separator water level control valve (31) is a cage spool control valve, waits hundred parts of ratio characteristics, and valve casing can bear supercritical pressure, and its Kv value should guarantee can cross the big flow when expanding at its inlet outlet pressure differential through the very hot startup water-cooling wall during for 0.5MPa.Because it is little that separator water level control valve (31) is imported and exported pressure ratio, do not have serious cavitation, need not to be split into 2 perhaps control valves of 3 parallel connections.
Oxygen-eliminating device (22) is a built-in deaerator, the highest permission operating pressure 2.0MPa, and Steam Turbine sliding pressure operation of deaer pressure at full capacity is no more than 1.1MPa, and direct current stove oxygen-eliminating device pressure when very hot startup is not higher than 1.5MPa; Oxygen-eliminating device (22) is provided with oxygen-eliminating device decompression exhaust steam valve (50), when oxygen-eliminating device (22) pressure occurs and is higher than the unusual service condition of 1.5MPa, opens fast, and steam enters the low voltage bypass inlet of condenser (25); When oxygen-eliminating device pressure returned to 1.0MPa, oxygen-eliminating device decompression exhaust steam valve (50) cut out automatically.Oxygen-eliminating device decompression exhaust steam valve (50) is when opening, and oxygen-eliminating device decompression exhaust steam valve (50) outlet pressure is no more than 0.7MPa, and the built-in energy dissipator of condenser (25) can be accepted safely; The relieving capacity of oxygen-eliminating device decompression exhaust steam valve (50) when inlet pressure 1.5MPa is 0.075BMCR.
Water storage tank outlet shutoff valve (42) can reliably be isolated the shell-side and the supercritical pressure of No. 1 high-pressure heater (44) when closing; Being provided with pressure sensor and observable drain valve between water storage tank outlet shutoff valve (42) and the separator water level control valve (31) closes tight to confirm water storage tank outlet shutoff valve (42).
After the power station supercritical DC furnace reaches minimum dc load; Steam-water separator (6) is dry state; Little superheat state, separator water level control valve (31) complete shut-down, each height adds the drain regulating valve complete shut-down; Close water storage tank outlet shutoff valve (42), the shell-side of tight isolation steam-water separator water storage tank (7) and No. 1 high-pressure heater (44); Unit DCS (dcs) switches to high-pressure heater water level control model to the control logic of the outlet drain regulating valve of each high-pressure heater; Open each high-pressure heater air inlet stop valve; Start each high-pressure heater and recover the heat regenerative system mode of operation.
The utility model does not need pipeline thermal back-up system between steam-water separator water storage tank (7) to the separator water level control valve (31) that the various direct current stove of prior art start-up system must have; Because after No. 1 high-pressure heater recovers the heat regenerative system mode of operation, the draw gas shell-side that makes No. 1 high-pressure heater (44) and the pipeline between No. 1 high-pressure heater (44) shell-side to the separator water level control valve (31) of steam turbine high-pressure cylinder remains on hot; Otherwise 3 high-pressure heaters also are the good preheatings that each high-pressure heater is returned the heat regenerative system state as the process of water water heat exchanger.
The utility model utilizes 3 high-pressure heaters of steamer pusher side between the power station supercritical DC furnace starting period; As the water water heat exchanger; The direct current stove is started hydrophobic echelon pressure and temperature reducing; High enthalpy starts hydrophobic echelon and emits heat, the hydrophobic enthalpy of startup is reduced to all is fit to the recovery of oxygen-eliminating device safety under the various startup operating modes.The unit DCS (dcs) of particular design has guaranteed each high-pressure heater to two control logics of high-pressure heater, under 2 kinds of different working modes, all can accomplish the heat regenerative system mode of operation that the direct current stove starts overall process and reduces the cold junction loss of power station thermodynamic cycle safely, economically.
The utility model recovering effect to working medium and heat between the power station supercritical DC furnace starting period is superior to that the direct current stove start-up system that starts boiler water circulating pump is arranged.
The utility model is applicable to the power station supercritical DC furnace start-up system of design a new generation, when high-pressure heater and oxygen-eliminating device bid, satisfies aforementioned additional requirement as the water water heat exchanger, can not increase a lot of expenses, but can significantly reduce the boiler island investment.
The utility model also can be used for the transformation of prior art in labour power station supercritical DC furnace start-up system; Get lower starting pressure; Steam-water separator pressure is got 4MPa respectively to 6MPa when cold start, warm starting, hot starting, hot start, very hot startup, suitably reduces oxygen-eliminating device pressure before starting to avoid changing wholesale investments such as oxygen-eliminating device, high-pressure heater shell.
Adopt the benefit of the utility model to be:
● cold start, hygrometric state startup, hot starting, hot start, very hot startup all can reclaim working medium and the heat in the supercritical DC furnace start-up course of power station comprehensively, and recovering effect is superior to that the direct current stove start-up system that starts boiler water circulating pump is arranged.
● begin from ignition of the boiler, water-cooling wall crosses expansion all can reclaim working medium and heat in the supercritical DC furnace start-up course of power station up to minimum dc load comprehensively, and recovering effect is superior to that the direct current stove start-up system that starts boiler water circulating pump is arranged.
● do not have the boiler water circulating pump of startup and subsystem thereof, reduce capital expenditure significantly, eliminate import and rely on.
● do not have the boiler water circulating pump of startup, save station service.
● do not have to start boiler water circulating pump, maintenance, maintenance workload are little, and it is low to possess expense.
● no steam-water separator water storage tank to separator water level control valve pipeline thermal back-up system, save the stand-by heat system energy consumption.
● operation is simple, safety, reliable, and operating cost is low.
● no iron pollution.
● the operting differential pressure of separator water level control valve is little, does not have serious cavitation, reduces cost significantly.
● be provided with and cross expansion pipeline stop valve and cross expansion pipeline control valve, can reduce requirement the through-current capability of 3 high-pressure heater shell-sides and 3 high-pressure heater drain regulating valves.
(4) description of drawings:
Fig. 1 has the direct current stove start-up system structure chart that starts boiler water circulating pump air suspended type dewatering capacity-enlarging device drainage pump.
Not drawing among Fig. 1 starts each subsystem that boiler water circulating pump needs, too numerous and diverse to avoid system construction drawing.
Start boiler water circulating pump (8) in direct current stove start-up course,, be pressed into economizer (5) through startup boiler water circulating pump outlet valve (9) and reclaim working medium and heat sucking the hydrophobic supercharging of startup that starts boiler water circulating pump (8); Begin from the direct current furnace igniting, 20% the startup flow of always having an appointment is admitted to air suspended type dewatering capacity-enlarging device (33), makes separator water level control valve (31) and corresponding pipeline keep hot, exempts from excessive thermal shock; Cross a few minutes of the phase of expansion at water-cooling wall; Start boiler water circulating pump (8) and can't the increment that pulsed occurs be started the hydrophobic economizer (5) of sending back to, drive big separator water level control valve (31) and open water storage tank drain valve (32) and increment is started the hydrophobic air suspended type dewatering capacity-enlarging device (33) of sending into to control the interior water level of steam-water separator (6) in normal range (NR).The startup of sending into air suspended type dewatering capacity-enlarging device (33) is hydrophobic; If water quality is qualified; Via drain tank (34), drainage pump (35), start that hydrophobic recovery valve (21) is recovered to condenser (25) but often because serious iron pollution; Working medium should not reclaim, and thermal loss defectively hydrophobicly enters trench through blowoff valve (27).
For being more readily understood the function of direct current stove start-up system, high pressure cylinder (17), high pressure main inlet throttle-stop valve (16), high pressure bypass valve (13), intermediate pressure cylinder (20), reheat stop interceptor valve (19), low pressure (LP) cylinder (24), low voltage bypass valve (23), condenser (25), condensate pump (26), low-pressure heater (28) overlap in also briefly the drawn main portion of part of main of the direct current furnace body cover high temperature superheater (1), pendant superheater (2), low temperature superheater (3), water-cooling wall (4), high temperature reheater (10), low-temperature reheater (11) and steam turbine and accessory system thereof of main cover of the direct current stove start-up system of in Fig. 1, not only having drawn.High-pressure heater (12) is a kind of simplification expression, and practical high-pressure heater system is composed in series by 3 usually; Height adds admission non-return valve (29) and height, and to add admission stop valve (30) be to cooperate this simplification expression accompanying drawing number.Low-pressure heater (28) is a kind of expression of more simplifying, and practical low-pressure heater system is composed in series by 4 usually; The admission of low-pressure heater (28) and hydrophobic all is simplified.
Fig. 2 has to start the direct current stove start-up system structure chart that boiler water circulating pump starts hydrophobic in line condenser.
Not drawing among Fig. 2 starts each subsystem that boiler water circulating pump needs, too numerous and diverse to avoid system construction drawing.
Start boiler water circulating pump (8) in direct current stove start-up course,, be pressed into economizer (5) through startup boiler water circulating pump outlet valve (9) and reclaim working medium and heat sucking the hydrophobic supercharging of startup that starts boiler water circulating pump (8); Be admitted to condenser (25) from direct current furnace igniting begin to have an appointment 20% startup flow always, make separator water level control valve (31) and corresponding pipeline valve keep hot, exempt from excessive thermal shock; Cross a few minutes of the phase of expansion at water-cooling wall; Start boiler water circulating pump (8) and can't the increment that pulsed occurs be started the hydrophobic economizer (5) of sending back to, open big separator water level control valve (31) and the hydrophobic recovery valve of startup (21) and enter condenser (25) through Backpack type temperature-decreased pressure reducer (43) and can control water level in the steam-water separator (6) in normal range (NR).All startups of sending into condenser (25) are hydrophobic is all reclaimed but thermal loss as working medium.
For being more readily understood the function of direct current stove start-up system, high pressure cylinder (17), high pressure main inlet throttle-stop valve (16), high pressure bypass valve (13), intermediate pressure cylinder (20), reheat stop interceptor valve (19), low pressure (LP) cylinder (24), low voltage bypass valve (23), condenser (25), condensate pump (26), low-pressure heater (28) overlap in also briefly the drawn main portion of part of main of the direct current furnace body cover high temperature superheater (1), pendant superheater (2), low temperature superheater (3), water-cooling wall (4), high temperature reheater (10), low-temperature reheater (11) and steam turbine and accessory system thereof of main cover of the direct current stove start-up system of in Fig. 2, not only having drawn.High-pressure heater (12) is a kind of simplification expression, and practical high-pressure heater system is composed in series by 3 usually; Height adds admission non-return valve (29) and height, and to add admission stop valve (30) be to cooperate this simplification expression accompanying drawing number.Low-pressure heater (28) is a kind of expression of more simplifying, and practical low-pressure heater system is composed in series by 4 usually; The admission of low-pressure heater (28) and hydrophobic all is simplified.
Fig. 3 does not start the direct current stove start-up system structure chart that boiler water circulating pump has air suspended type dewatering capacity-enlarging device drainage pump for having.
In direct current stove whole starting process, comprise a few minutes of crossing the phase of expansion, the water level in the steam-water separator (6) is regulated by water storage tank water level bypass valve (18), separator water level control valve (31) and water storage tank drain valve (32) combination; Start and hydrophobicly get into oxygen-eliminating device (22) part heat via water storage tank water level bypass valve (18) and can reclaim; Serious iron pollution starts hydrophobic not only thermal loss through separator water level control valve (31) and water storage tank drain valve (32) entering air suspended type dewatering capacity-enlarging device (33) part, owing to also should not reclaim working medium.
For being more readily understood the function of direct current stove start-up system, high pressure cylinder (17), high pressure main inlet throttle-stop valve (16), high pressure bypass valve (13), intermediate pressure cylinder (20), reheat stop interceptor valve (19), low pressure (LP) cylinder (24), low voltage bypass valve (23), condenser (25), condensate pump (26), low-pressure heater (28) overlap in also briefly the drawn main portion of part of main of the direct current furnace body cover high temperature superheater (1), pendant superheater (2), low temperature superheater (3), water-cooling wall (4), high temperature reheater (10), low-temperature reheater (11) and steam turbine and accessory system thereof of main cover of the direct current stove start-up system of in Fig. 3, not only having drawn.High-pressure heater (12) is a kind of simplification expression, and practical high-pressure heater system is composed in series by 3 usually; Height adds admission non-return valve (29) and height, and to add admission stop valve (30) be to cooperate this simplification expression accompanying drawing number.Low-pressure heater (28) is a kind of expression of more simplifying, and practical low-pressure heater system is composed in series by 4 usually; The admission of low-pressure heater (28) and hydrophobic all is simplified.
Fig. 4 does not start the direct current stove start-up system structure chart that boiler water circulating pump starts hydrophobic in line condenser for having.
In direct current stove whole starting process; Comprise a few minutes of crossing the phase of expansion; Water level in the steam-water separator (6) is started hydrophobic warp startup hydrophobic recovery valve (21) and Backpack type temperature-decreased pressure reducer (43) and is reclaimed at condenser (25) by separator water level control valve (31) control, starts hydrophobic thermal loss.
For being more readily understood the function of direct current stove start-up system, high pressure cylinder (17), high pressure main inlet throttle-stop valve (16), high pressure bypass valve (13), intermediate pressure cylinder (20), reheat stop interceptor valve (19), low pressure (LP) cylinder (24), low voltage bypass valve (23), condenser (25), condensate pump (26), low-pressure heater (28) overlap in also briefly the drawn main portion of part of main of the direct current furnace body cover high temperature superheater (1), pendant superheater (2), low temperature superheater (3), water-cooling wall (4), high temperature reheater (10), low-temperature reheater (11) and steam turbine and accessory system thereof of main cover of the direct current stove start-up system of in Fig. 4, not only having drawn.High-pressure heater (12) is a kind of simplification expression, and practical high-pressure heater system is composed in series by 3 usually; Height adds admission non-return valve (29) and height, and to add admission stop valve (30) be to cooperate this simplification expression accompanying drawing number.Low-pressure heater (28) is a kind of expression of more simplifying, and practical low-pressure heater system is composed in series by 4 usually; The admission of low-pressure heater (28) and hydrophobic all is simplified.
Fig. 5 is for can reclaim the no pump direct current stove start-up system structure chart of working medium and heat comprehensively.
The core knowledge property right of the utility model is between the direct current stove starting period, to have introduced No. 1 high-pressure heater (44) of steamer pusher side, No. 2 high-pressure heaters (45), No. 3 high-pressure heaters (46) as the water water heat exchanger; Be cooled to the temperature that oxygen-eliminating device (22) can be accepted safely with the startup of high enthalpy is hydrophobic, reclaim working medium and heat comprehensively.One of the heat that reclaims is made up of 2 parts,, the startup of high enthalpy is hydrophobic to be absorbed by high-pressure feed water through water water heat exchanger liberated heat; Two, the startup slightly higher than deaerator storage tank water storage temperature be hydrophobic carries heat with hybrid mode and gets into oxygen-eliminating device.
The hydrophobic shell-side through water storage tank outlet shutoff valve (42), separator water level control valve (31) No. 1 high-pressure heater of entering (44) of the startup that steam-water separator water storage tank (7) comes out is after the cooling, through No. 1 high drain regulating valve (47) that adds; Get into the shell-side of No. 2 high-pressure heaters (45); After the cooling,, get into the shell-side of No. 3 high-pressure heaters (46) through No. 2 high drain regulating valves (48) that add; After the cooling, enter oxygen-eliminating device (22) through No. 3 high drain regulating valves (49) that add.Feed pump (15) sucks low pressure feed water from oxygen-eliminating device (22); Become high-pressure feed water after the supercharging; Through feed pump outlet valve (14); Flow through the successively pipe side of No. 3 high-pressure heaters (46), No. 2 high-pressure heaters (45), No. 1 high-pressure heater (44) gets into economizer (5) behind the cascade raising temperature, accomplish comprehensive recovery of working medium and heat.
It is the phenomenon that the steam-water separator water level that when water screen system begins to steam, occurs jumps, the hydrophobic pulsed of boiler startup increases that water-cooling wall crosses expansion.Water-cooling wall crosses to open fast when expanding and crosses expansion pipeline control valve (52); The boiler startup that pulsed increases is hydrophobic through crossing expansion pipeline stop valve (51) and crossing expansion pipeline control valve (52) and send into oxygen-eliminating device (22), and the water level that can control steam-water separator water storage tank (7) is in allowed band.Increase to be provided with and cross expansion pipeline stop valve (51) and cross expansion pipeline control valve (52), can reduce requirement the through-current capability of 3 high-pressure heater shell-sides and 3 high-pressure heater drain regulating valves.
After the power station supercritical DC furnace reaches minimum dc load; Steam-water separator (6) is the little superheat state of dry state; The water level to 0 of steam-water separator water storage tank (7); Separator water level control valve (31) complete shut-down, No. 1 high drain regulating valve (47), No. 2 high drain regulating valve (48), No. 3 high drain regulating valve (49) complete shut-downs that add of adding of adding continue to close after 120 seconds water storage tank outlet shutoff valve (42); DCS (dcs) recovers No. 1 high drain regulating valve (47), No. 2 high drain regulating valve (48), No. 3 high water level control models that add drain regulating valve (49) of adding of adding; Open high admission stop valve (41), No. 2 high admission stop valve (40), No. 1 high admission stop valves (39) that add of adding of adding successively No. 3; No. 1 high-pressure heater (44), No. 2 high-pressure heaters (45), No. 3 high-pressure heaters (46) return the heat regenerative system method of operation.
For being more readily understood the function of direct current stove start-up system, high pressure cylinder (17), high pressure main inlet throttle-stop valve (16), high pressure bypass valve (13), intermediate pressure cylinder (20), reheat stop interceptor valve (19), low pressure (LP) cylinder (24), low voltage bypass valve (23), condenser (25), condensate pump (26), low-pressure heater (28) overlap in also briefly the drawn main portion of part of main of the direct current furnace body cover high temperature superheater (1), pendant superheater (2), low temperature superheater (3), water-cooling wall (4), high temperature reheater (10), low-temperature reheater (11) and steam turbine and accessory system thereof of main cover of the direct current stove start-up system of in Fig. 5, not only having drawn.
3 high-pressure heaters and related valve have given new figure and Reference numeral.
In Fig. 5, do not draw unit DCS (dcs) in order to avoid figure is too complicated.
Reference numeral in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5:
1 high temperature superheater, 2 pendant superheaters, 3 low temperature superheaters,
4 water-cooling walls, 5 economizers, 6 steam-water separators,
7 steam-water separator water storage tanks, 8 start boiler water circulating pumps, 9 start the boiler water circulating pump outlet valves,
10 high temperature reheaters, 11 low-temperature reheaters, 12 high-pressure heaters,
13 high pressure bypass valves, 14 feed pump outlet valves, 15 feed pumps,
16 high pressure main inlet throttle-stop valves, 17 high pressure cylinders, 18 separator water level bypass valves,
19 reheat stop interceptor valves, 20 intermediate pressure cylinders, 21 start hydrophobic recovery valve,
22 oxygen-eliminating devices, 23 low voltage bypass valves, 24 low pressure (LP) cylinders,
25 condensers, 26 condensate pumps, 27 blowoff valves,
28 low-pressure heaters, 29 height add admission non-return valve, 30 height add the admission stop valve,
31 separator water level control valves, 32 water storage tank drain valves, 33 air suspended type dewatering capacity-enlarging devices,
34 drain tanks, 35 drainage pumps, 36 No. 1 are high add the admission non-return valve,
37 No. 2 high add admission non-return valve, 38 No. 3 high add admission non-return valve, 39 No. 1 high add the admission stop valve,
40 No. 2 high add admission stop valve, 41 No. 3 high add admission stop valve, 42 water storage tank outlet shutoff valves,
43 Backpack type temperature-decreased pressure reducers, 44 No. 1 high-pressure heaters, 45 No. 2 high-pressure heaters,
46 No. 3 high-pressure heaters, 47 No. 1 be high add drain regulating valve, 48 No. 2 high add drain regulating valve,
49 No. 3 high add drain regulating valve, 50 oxygen-eliminating devices decompression exhaust steam valve, 51 cross expansion pipeline stop valve,
52 cross expansion pipeline control valve.
(5) specific embodiment:
Below be example with the power station supercritical DC furnace of a 1000MW grade, in conjunction with Fig. 5, further specify the no pump direct current stove start-up system that the utility model can reclaim working medium and heat comprehensively:
The no pump direct current stove start-up system that the utility model can reclaim working medium and heat comprehensively comprises steam-water separator (6); Steam-water separator water storage tank (7); Water storage tank outlet shutoff valve (42); Separator water level control valve (31); No. 1 high admission stop valve (39) that adds; No. 2 high admission stop valves (40) that add; No. 3 high admission stop valves (41) that add; No. 1 high-pressure heater (44); No. 2 high-pressure heaters (45); No. 3 high-pressure heaters (46); No. 1 high drain regulating valve (47) that adds; No. 2 high drain regulating valves (48) that add; No. 3 high drain regulating valves (49) that add; Oxygen-eliminating device (22); Oxygen-eliminating device decompression exhaust steam valve (50); Cross expansion pipeline stop valve (51); Cross expansion pipeline control valve (52) and unit DCS (dcs).
Check and revise flow area and the Kv value of separator water level control valve (31) of the import of drawing gas of No. 1 high-pressure heater (44); Guarantee that when very hot startup 30%BMCR flow passes through steam-water separator (6) is no more than 1.0MPa with the pressure reduction of No. 1 high-pressure heater (44) shell-side.Inspection confirms that the draw gas strike plate of import of No. 1 high-pressure heater (44) is enough to bear the hydrophobic impact of boiler startup, can not damage U type pipe group, in case of necessity the reinforcement strike plate.The hydrophobic outlet flow area, No. 1 of checking and revise No. 1 high-pressure heater (44) be high to add the Kv value of drain regulating valve (47) and the height of No. 2 high-pressure heaters (45) adds hydrophobic inlet flow area; Guarantee that the shell pressure of No. 1 high-pressure heater (44) is not higher than 8MPa when very hot startup 30%BMCR flow passes through; The hydrophobic outlet flow area, No. 2 of checking and revise No. 2 high-pressure heaters (45) be high to add the Kv value of drain regulating valve (48) and the height of No. 3 high-pressure heaters (46) adds hydrophobic inlet flow area; Guarantee that the shell pressure of No. 2 high-pressure heaters (45) is not higher than 5.8MPa when very hot startup 30%BMCR flow passes through; The hydrophobic outlet flow area, No. 3 of checking and revise No. 3 high-pressure heaters (46) be high to add the Kv value of drain regulating valve (49) and the height of oxygen-eliminating device (22) adds hydrophobic inlet flow area; Guarantee that the shell pressure of No. 3 high-pressure heaters (46) is not higher than 2.5MPa when very hot startup 30%BMCR flow passes through.No. 1 high adds that drain regulating valve (47), No. 2 are high to add that drain regulating valve (48), No. 3 are high to add hundred parts of ratio characteristics such as drain regulating valve (49) is.
Get the allowable stress under 300 ℃, check the highest safe bearing capacity of No. 1 high-pressure heater (44) shell-side, should be greater than 11.25MPa; Get the allowable stress under 280 ℃, check the highest safe bearing capacity of No. 2 high-pressure heaters (45) shell-side, should be greater than 8.12MPa; Get the allowable stress under 250 ℃, check the highest safe bearing capacity of No. 3 high-pressure heaters (46) shell-side, should be greater than 3.5MPa.In case of necessity, increasing each high-pressure heater thickness of shell can check through this casing rigidity safety until each high-pressure heater.
Control logic when the control logic of the outlet drain regulating valve of high-pressure heater when high-pressure heater is used as the water water heat exchanger is used as heat regenerative system with high-pressure heater is different fully; Unit DCS (dcs) must have 2 cover Different control logics, switches in good time.When the water water heat exchanger, No. 1 of the hydrophobic outlet of No. 1 high-pressure heater (44) is high to be added drain regulating valve (47) and is used to control the pressure differential between No. 1 high-pressure heater (44) shell-side and No. 2 high-pressure heaters (45) shell-side at high-pressure heater; No. 2 of the hydrophobic outlet of No. 2 high-pressure heaters (45) are high to be added drain regulating valve (48) and is used to control the pressure differential between No. 2 high-pressure heater (45) shell-sides and No. 3 high-pressure heaters (46) shell-side; No. 3 of the hydrophobic outlet of No. 3 high-pressure heaters (46) are high to be added drain regulating valve (49) and is used to control the pressure differential between No. 3 high-pressure heater (46) shell-sides and the oxygen-eliminating device (22).Outlet drain regulating valve with each high-pressure heater is the shell pressure of the adjusting target of governor motion for each corresponding high-pressure heater; Regulate desired value and oxygen-eliminating device pressure immediately, steam-water separator pressure is relevant; The shell pressure desired value of No. 1 high-pressure heater (44) is that the pressure of steam-water separator (6) subtracts 1.0MPa, and the shell pressure desired value of No. 3 high-pressure heaters (46) is that the pressure of oxygen-eliminating device (22) adds 1.0MPa; It is poor that the shell pressure desired value of No. 2 high-pressure heaters (45) is that the shell pressure of No. 3 high-pressure heaters (46) adds 0.6 times No. 1 high-pressure heater (44) and No. 3 high-pressure heaters (46) shell pressure.
Steam-water separator pressure is got 6MPa respectively to 9MPa when cold start, warm starting, hot starting, hot start, very hot startup, and cold start is got than low value, and very hot startup is got high value, and warm starting, hot starting, hot start are got median; Steam-water separator pressure can be used the aperture and the fuel quantity control of high and low pressure bypass valve in the start-up course.
Between the direct current stove starting period; No. 1 high adds that admission stop valve (39), No. 2 highly add admission stop valve (40), No. 3 high admission stop valves (41) that add all are in close stance, and the shell-side of the shell-side of No. 1 high-pressure heater (44), No. 2 high-pressure heaters (45), the shell-side and the extracted steam from turbine system of No. 3 high-pressure heaters (46) reliably isolate.
The hydrophobic shell-side through water storage tank outlet shutoff valve (42), separator water level control valve (31) No. 1 high-pressure heater of entering (44) of the startup that steam-water separator water storage tank (7) comes out after the cooling, reduces pressure through No. 1 high drain regulating valve (47) that adds; Get into the shell-side of No. 2 high-pressure heaters (45); After the cooling, reduce pressure, get into the shell-side of No. 3 high-pressure heaters (46) through No. 2 high drain regulating valves (48) that add; After the cooling, highly add drain regulating valve (49) decompression and enter oxygen-eliminating device (22) through No. 3; Feed pump (15) sucks low pressure feed water from oxygen-eliminating device (22); Become high-pressure feed water after the supercharging; Through feed pump outlet valve (14); Flow through the successively pipe side of No. 3 high-pressure heaters (46), No. 2 high-pressure heaters (45), No. 1 high-pressure heater (44) gets into economizer (5) behind the cascade raising temperature, accomplish comprehensive recovery of working medium and heat.
When the big flow that crosses expansion at the very hot startup water-cooling wall starts hydrophobic passing through; No. 1 high adds that drain regulating valve (47), No. 2 are high to be added when drain regulating valve (48), No. 3 are high to add drain regulating valve (49) standard-sized sheet; The boiler startup that pulsed increases is hydrophobic through crossing expansion pipeline stop valve (51) and crossing expansion pipeline control valve (52) and send into oxygen-eliminating device (22), and the water level that can control steam-water separator water storage tank (7) is in allowed band; Oxygen-eliminating device (22) is with the low enthalpy condensate of stepping, and the pressure of control oxygen-eliminating device (22) is not higher than 1.5MPa.Increase to be provided with and cross expansion pipeline stop valve (51) and cross expansion pipeline control valve (52), can reduce requirement the through-current capability of 3 high-pressure heater shell-sides and 3 high-pressure heater drain regulating valves.
Water storage tank outlet shutoff valve (42) has the ability of reliable isolation supercritical pressure, is provided with pressure sensor and observable drain valve between water storage tank outlet shutoff valve (42) and the separator water level control valve (31) and closes tight to confirm water storage tank outlet shutoff valve (42).The condition that water storage tank outlet shutoff valve (42) is opened is: steam-water separator pressure is not higher than 9.0MPa; No. 1 high adds that admission stop valve (39), No. 2 highly add admission stop valve (40), No. 3 high admission stop valves (41) that add are all closed tight; No. 1 high drain regulating valve (47), No. 2 high drain regulating valve (48), No. 3 high initial aperture zone that drain regulating valve (49) all is positioned at aperture 70% to 80%, unit DCS (dcs) entering water water heat exchanger control models of adding of adding of adding; Feed pump (15) is in proper working order, and the position left by feed pump outlet valve (14); Above condition satisfies simultaneously, with logic.
Cross expansion pipeline stop valve (51) bearing capacity 12MPa, water-cooling wall crosses the expansion front opening, and water-cooling wall is closed after crossing expansion.The Kv value of crossing expansion pipeline control valve (52) should guarantee smoothly to cross the pulse flow when expanding through water-cooling wall, and possesses stronger anti-cavitation ability.
Separator water level control valve (31) is a cage spool control valve, waits hundred parts of ratio characteristics, and shell can bear supercritical pressure, and its Kv value should guarantee can pass through very hot startup 30%BMCR flow at inlet outlet pressure differential during for 0.5MPa.
Oxygen-eliminating device (22) is a built-in deaerator, the highest permission operating pressure 2.0MPa, and Steam Turbine oxygen-eliminating device operating pressure at full capacity is no more than 1.1MPa, and direct current stove oxygen-eliminating device pressure when very hot startup is not higher than 1.5MPa; Oxygen-eliminating device (22) is provided with and crosses expansion pipeline inlet; Oxygen-eliminating device (22) is provided with oxygen-eliminating device decompression exhaust steam valve (50), when oxygen-eliminating device pressure is higher than 1.5MPa, opens fast, and steam enters the low voltage bypass inlet of condenser (25); When oxygen-eliminating device pressure returned to 1.0MPa, oxygen-eliminating device decompression exhaust steam valve (50) cut out automatically.Oxygen-eliminating device decompression exhaust steam valve (50) when opening oxygen-eliminating device decompression exhaust steam valve (50) outlet pressure be no more than 0.7MPa, the built-in energy dissipator of condenser (25) can be accepted safely: the relieving capacity of oxygen-eliminating device decompression exhaust steam valve (50) when inlet pressure 1.5MPa is 0.075BMCR.
Unit DCS (dcs) coordinates control steam-water separator (6); Steam-water separator water storage tank (7); Water storage tank outlet shutoff valve (42); Separator water level control valve (31); No. 1 high admission stop valve (39) that adds; No. 2 high admission stop valves (40) that add; No. 3 high admission stop valves (41) that add; No. 1 high-pressure heater (44); No. 2 high-pressure heaters (45); No. 3 high-pressure heaters (46); No. 1 high drain regulating valve (47) that adds; No. 2 high drain regulating valves (48) that add; No. 3 high drain regulating valves (49) that add; Oxygen-eliminating device (22); Oxygen-eliminating device decompression exhaust steam valve (50); Cross expansion pipeline stop valve (51); Cross expansion pipeline control valve (52) safety; Accomplish direct current stove start-up course economically.After accomplishing start-up course, unit DCS closes water storage tank outlet shutoff valve (42) and isolates steam-water separator water storage tank (7) and No. 1 high-pressure heater (44) shell-side reliably, and unit DCS recovers high-pressure heater heat regenerative system mode and moves.
Underrun of direct current stove and furnace shutting down process are the inverse process that the direct current stove starts.When minimum dc load is arrived in the downhill race of direct current stove load; The pressure downhill race of steam-water separator (6) is to 9MPa or lower; No. 1 high admission stop valve (39), No. 2 high admission stop valve (40), No. 3 high admission stop valves (41) that add of adding of adding of tight closing make No. 1 high-pressure heater (44), No. 2 high-pressure heaters (45), No. 3 high-pressure heaters (46) withdraw from the heat regenerative system state; Unit DCS (dcs) switches to water water heat exchanger control logic; No. 1, DCS instruction is high to add that drain regulating valve (47), No. 2 are high to add that drain regulating valve (48), No. 3 are high to add the initial aperture zone that drain regulating valve (49) all is positioned at aperture 70% to 80%; When visible water level appears in steam-water separator (6); Open water storage tank outlet shutoff valve (42) by separator water level control valve (31) at the DCS control water level of adjusting steam-water separator (6) down, DCS coordinates to control No. 1 and highly adds that drain regulating valve (47), No. 2 are high to add shell pressure that drain regulating valve (48), No. 3 high apertures that add drain regulating valve (49) make No. 1 high-pressure heater (44), No. 2 high-pressure heaters (45), No. 3 high-pressure heaters (46) in desired value separately; The hydrophobic shell-side through water storage tank outlet shutoff valve (42), separator water level control valve (31) No. 1 high-pressure heater of entering (44) of blowing out after the cooling, reduces pressure through No. 1 high drain regulating valve (47) that adds; Get into the shell-side of No. 2 high-pressure heaters (45); After the cooling, reduce pressure, get into the shell-side of No. 3 high-pressure heaters (46) through No. 2 high drain regulating valves (48) that add; After the cooling, highly add drain regulating valve (49) decompression and enter oxygen-eliminating device (22) through No. 3; Feed pump (15) sucks low pressure feed water from oxygen-eliminating device (22); Become high-pressure feed water after the supercharging; Through feed pump outlet valve (14); Flow through the successively pipe side of No. 3 high-pressure heaters (46), No. 2 high-pressure heaters (45), No. 1 high-pressure heater (44) gets into economizer (5) behind the cascade raising temperature, accomplish comprehensive recovery of working medium and heat.
The hydrophobic amount of furnace shutdown period blowing out quite is less than confluent, and the pressure of oxygen-eliminating device (22) glides, and compares safer with the startup operating mode.

Claims (10)

1. no pump direct current stove start-up system that can comprehensively reclaim working medium and heat is characterized in that: comprise that the high high high high high drain regulating valve (48), No. 3 of adding of drain regulating valve (47), No. 2 that add of admission stop valve (41), No. 1 high-pressure heater (44), No. 2 high-pressure heaters (45), No. 3 high-pressure heaters (46), No. 1 that add of admission stop valve (40), No. 3 that add of admission stop valve (39), No. 2 that add of steam-water separator (6), steam-water separator water storage tank (7), water storage tank outlet shutoff valve (42), water storage tank level control valve (31), No. 1 highly adds drain regulating valve (49), oxygen-eliminating device (22), deaerator exhaust valve (50), crosses expansion pipeline stop valve (51), crosses expansion pipeline control valve (52) and unit DCS; The hydrophobic outlet of startup of steam-water separator water storage tank (7) is connected with the shell-side inlet of No. 1 high-pressure heater (44) through water storage tank outlet shutoff valve (42), water storage tank level control valve (31); No. 1 high adds drain regulating valve (47) outlet and is connected with the shell-side inlet of No. 2 high-pressure heaters (45); No. 2 high adds drain regulating valve (48) outlet and is connected with the shell-side inlet of No. 3 high-pressure heaters (46); No. 3 high adds drain regulating valve (49) outlet and is connected with the hydrophobic import of startup of oxygen-eliminating device (22); Feed pump (15) inlet is connected with the delivery port of oxygen-eliminating device (22); Feed pump outlet valve (14) is connected with the feed-water inlet of No. 3 high-pressure heaters (46); The water out of giving of No. 1 high-pressure heater (44) is connected with the inlet of economizer (5); Crossing expansion pipeline stop valve (51) is connected with the hydrophobic inlet of startup of oxygen-eliminating device (22) through crossing expansion pipeline control valve (52).
2. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1 is characterized in that the described expansion pipeline stop valve (51) that crosses is for having the stop valve of 12MPa bearing capacity; Cross expansion pipeline control valve (52) for having the control valve of 12MPa bearing capacity.
3. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1; It is characterized in that described water storage tank level control valve (31) is a cage balance valve core control valve; Deng hundred parts of ratio characteristics; Shell can bear supercritical pressure, and its Kv value should guarantee can be through the flow of very hot startup 30%BMCR during for 0.5MPa at its inlet outlet pressure differential.
4. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1; The import of drawing gas that it is characterized in that described No. 1 high-pressure heater (44) is provided with and is enough to bear the hydrophobic impact of boiler startup, can not damage the strike plate of U type pipe group.
5. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1; It is characterized in that described No. 1 high-pressure heater (44) has when very hot startup 30%BMCR flow passes through, the shell pressure of No. 1 high-pressure heater (44) is not more than the hydrophobic outlet flow area of 8MPa; No. 1 high-pressure heater (44) has at the thickness of shell of 300 ℃ of following bearing capacities greater than 11.25MPa.
6. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1; It is characterized in that described No. 2 high-pressure heaters (45) have when very hot startup 30%BMCR flow passes through, the shell pressure of No. 2 high-pressure heaters (45) is not more than the hydrophobic outlet flow area of 5.8MPa; No. 2 high-pressure heaters (45) have at the thickness of shell of 280 ℃ of following bearing capacities greater than 8.12MPa.
7. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1; It is characterized in that described No. 3 high-pressure heaters (46) have when very hot startup 30%BMCR flow passes through, the shell pressure of No. 3 high-pressure heaters (46) is not more than the hydrophobic outlet flow area of 2.5MPa; No. 3 high-pressure heaters (46) have at the thickness of shell of 250 ℃ of following bearing capacities greater than 3.5MPa.
8. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1 is characterized in that described oxygen-eliminating device (22) is a built-in deaerator, the highest permission operating pressure 2.0MPa; Oxygen-eliminating device (22) is provided with and crosses expansion pipeline inlet.
9. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1 is characterized in that the import of described deaerator exhaust valve (50) is connected with the steam drain of oxygen-eliminating device (22); The outlet of deaerator exhaust valve (50) is connected with the low voltage bypass inlet of condenser (25); Oxygen-eliminating device decompression exhaust steam valve (50) is at inlet pressure 1.5MPa, and outlet pressure can be through the flow of 0.075BMCR during for 0.7MPa.
10. the no pump direct current stove start-up system that can comprehensively reclaim working medium and heat according to claim 1 is characterized in that described unit DCS highly adds drain regulating valve (49), oxygen-eliminating device (22), deaerator exhaust valve (50), crosses expansion pipeline stop valve (51), crosses expansion pipeline control valve (52) and be connected with the high high high high high drain regulating valve (48), No. 3 of adding of drain regulating valve (47), No. 2 that add of admission stop valve (41), No. 1 high-pressure heater (44), No. 2 high-pressure heaters (45), No. 3 high-pressure heaters (46), No. 1 that add of admission stop valve (40), No. 3 that add of admission stop valve (39), No. 2 that add of steam-water separator (6), steam-water separator water storage tank (7), water storage tank outlet shutoff valve (42), water storage tank level control valve (31), No. 1 respectively; Unit DCS highly adds that drain regulating valve (47), No. 2 highly add drain regulating valve (48), No. 3 high drain regulating valves (49) that add dispose 2 cover Different control logic modules to No. 1.
CN2011201838304U 2011-06-02 2011-06-02 Pumpless direct-current furnace startup system capable of fully recycling working media and heat Expired - Fee Related CN202188482U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103528040A (en) * 2013-10-16 2014-01-22 江苏大学 Quick boiler starting system and method
CN103953915A (en) * 2014-05-19 2014-07-30 章礼道 Method for recycling startup drained water working medium and heat of secondary reheating boiler through high-pressure heaters
CN105605551A (en) * 2016-03-14 2016-05-25 西安热工研究院有限公司 System and method for heating boiler feed water through steam turbine bypass steam
CN105953208A (en) * 2016-06-23 2016-09-21 中国电力工程顾问集团中南电力设计院有限公司 Boiler starting and separating bypass steam utilization device and method
CN112303604A (en) * 2020-10-29 2021-02-02 西安热工研究院有限公司 Economizer temperature governing system that unit start-up process denitration was put into

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103528040A (en) * 2013-10-16 2014-01-22 江苏大学 Quick boiler starting system and method
CN103528040B (en) * 2013-10-16 2015-04-22 江苏大学 Quick boiler starting system and method
CN103953915A (en) * 2014-05-19 2014-07-30 章礼道 Method for recycling startup drained water working medium and heat of secondary reheating boiler through high-pressure heaters
CN105605551A (en) * 2016-03-14 2016-05-25 西安热工研究院有限公司 System and method for heating boiler feed water through steam turbine bypass steam
CN105953208A (en) * 2016-06-23 2016-09-21 中国电力工程顾问集团中南电力设计院有限公司 Boiler starting and separating bypass steam utilization device and method
CN105953208B (en) * 2016-06-23 2019-01-01 中国电力工程顾问集团中南电力设计院有限公司 A kind of boiler startup separation reject steam utilizes device and method
CN112303604A (en) * 2020-10-29 2021-02-02 西安热工研究院有限公司 Economizer temperature governing system that unit start-up process denitration was put into
CN112303604B (en) * 2020-10-29 2022-09-13 西安热工研究院有限公司 Economizer temperature governing system that unit start-up process denitration was put into

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