WO2019042020A1 - Dispositif de récupération de chaleur - Google Patents

Dispositif de récupération de chaleur Download PDF

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Publication number
WO2019042020A1
WO2019042020A1 PCT/CN2018/095071 CN2018095071W WO2019042020A1 WO 2019042020 A1 WO2019042020 A1 WO 2019042020A1 CN 2018095071 W CN2018095071 W CN 2018095071W WO 2019042020 A1 WO2019042020 A1 WO 2019042020A1
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WIPO (PCT)
Prior art keywords
feed water
final stage
additional
steam
water heater
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Ceased
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PCT/CN2018/095071
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English (en)
Chinese (zh)
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冯煜珵
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Individual
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Individual
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Publication of WO2019042020A1 publication Critical patent/WO2019042020A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
    • F22D1/325—Schematic arrangements or control devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators

Definitions

  • the present disclosure relates to the field of thermal power generation, for example, to a regenerative device.
  • Chinese patent ZL201110459533.2 discloses an adjustable feed water regenerative device, that is, compared with the conventional steam turbine generator set, the final stage extraction pressure set on the high pressure cylinder is higher than the conventional maximum extraction pressure of the high pressure cylinder;
  • An extraction steam regulating valve is disposed on the final stage steam extraction pipe, and then the feed water is heated back and forth through the feed water heater.
  • the final stage extraction can be adjusted through the valve, so that the pressure after the extraction control valve is basically unchanged when the unit is under variable load, and the temperature of the boiler feed water is maintained substantially unchanged by the final stage feed water heater.
  • the system and method provided by the patent still have shortcomings. Due to the sliding pressure operation of the unit, the pressure of the extraction port is also low when the unit is in the ultra-low load and the starting stage, and the denitration in the start-up phase or the ultra-low-load phase is still not achieved. In addition, for subcritical units, due to the low pressure parameters of the subcritical units, there is also the problem that the denitration does not meet the requirements and exits during the low load phase; more importantly, the system and method provided by the patent It also has application limitations, and it cannot be directly applied to units with no additional extraction ports for steam turbines.
  • thermal power generators are equipped with a bypass system to meet the requirements of start-stop and accident conditions of the unit.
  • a large amount of steam generated by burning coal and fuel is passed through the boiler.
  • the road system is finally fed into the condenser until the steam turbine has passed the steam quality and the steam parameters meet the rushing conditions.
  • the steam turbine is started to rush, and finally the grid is connected to the grid, and the bypass is finally closed.
  • the cold start of the traditional thermal power generating unit is about 8-10 hours from ignition to grid connection. During this period, a large amount of steam is sent to the condenser through the bypass system, and the heat is lost although the working medium is recovered.
  • problems such as low temperature condensation, ash blocking and corrosion in equipment such as low pulverized coal burning rate, fuel black smoke and tail flue air preheater in the start-up phase.
  • the present disclosure provides a method of regenerative equipment, which can solve the problems faced by the above-mentioned low load, start-up phase and the deficiencies of the adjustable feedwater regenerative equipment in the related art.
  • the application provides a regenerative device, including:
  • a final feedwater heater that uses the main steam in the main steam line as a heat source
  • the final stage extraction pipe connects the high pressure cylinder and the final stage feed water heater
  • a steam side regulating valve disposed on the additional pipe, configured to adjust main steam in the additional pipe to control an extraction pressure after the steam side regulating valve to control an outlet temperature of the feedwater heater To reach the preset feed water temperature.
  • the additional adjustable final stage feedwater heater being disposed at a rear of the final feedwater heater according to a water flow direction; the additional conduit connection The main steam line and the additional adjustable final stage feed water heater.
  • At least one water side regulating valve is further included, the water side regulating valve being connected in parallel with the additional adjustable rear final stage feedwater heater.
  • the regenerative equipment of this embodiment does not need to provide an additional steam turbine extraction port, including the subcritical unit.
  • the main steam can still have the main steam pressure and the super low load pressure of the unit. Sufficient pressure to meet the requirements of increasing the feed water temperature to meet the denitration operation.
  • the regenerative device of the embodiment can be put into use in the startup phase of the unit, and a part of the heat of a large amount of steam originally sent to the condenser through the bypass system can be recovered, used for supplemental heating boiler feed water in the startup phase, and the feed water temperature is increased. Indirect replenishment preheats the entire boiler, which can significantly reduce the fuel and coal consumption during the start-up phase. Since the regenerative equipment can be put into operation during the start-up phase, equipment such as an empty preheater with low pulverized coal combustion rate, black smoke and tail flue is prone to low temperature condensation, ashing and corrosion. Such problems can be ensured that the unit can be put into the SCR denitration unit before the grid connection, and the life of the SCR catalyst can be extended.
  • FIG. 1 is a schematic structural view of a regenerative device provided in Embodiment 1.
  • Embodiment 2 is a schematic structural view of a heat recovery device provided in Embodiment 2.
  • Embodiment 3 is a schematic structural view of a regenerative device provided in Embodiment 3.
  • Embodiment 1 is a schematic structural view of a regenerative apparatus provided in Embodiment 1, which is provided on the basis of a final stage extraction port 1, a final stage extraction steam 10, a final stage feed water heater 11, and a main steam line 2.
  • An additional pipe 01, a steam side regulating valve 02 on the additional pipe, and an additional adjustable final stage feed water heater 03 are provided.
  • the additional adjustable rear final stage feed water heater 03 is connected to the main steam line 2 via an additional line 01, which is arranged on the additional line 01.
  • the steam side regulating valve 02 is for regulating the main steam in the additional pipe 01, and controls the feed water temperature of the outlet of the additional adjustable rear final stage feed water heater 03 by controlling the pressure after the steam side regulating valve 02.
  • the control method of the present embodiment will be described in detail by taking an example of a 1000 MW unit of a power plant, wherein the steam turbine is an ultra-supercritical single-shaft, one-time reheat or four-cylinder four-row steam condensing steam turbine.
  • the main steam parameter at rated operating conditions (1000 WM) is 27 MPa/600 °C.
  • the pressure of the feed water heater is controlled to be about 8.5 MPa by adjusting the steam side regulating valve to maintain the feed water temperature at about 300 °C.
  • the steam generated by the consumption of coal and fuel can be replenished by the additional pipe 01 into the additional adjustable rear final stage feed water heater 03 to increase the feed water temperature during the start-up phase, reducing the feed water temperature during the start-up phase.
  • the inlet of the water wall in the start-up phase is low, which solves the problem of hydrodynamic instability during the start-up phase, which creates favorable conditions for the quick start of the unit, achieves a significant reduction in the starting energy consumption, and solves the pulverized coal combustion generated in the traditional start-up phase.
  • Equipment such as low enthalpy rate, black smoke from fuel, and air preheaters in the tail flue are prone to low temperature condensation, ashing and corrosion, and can ensure that the unit can be put into the SCR denitration unit before being connected to the grid. SCR catalyst life.
  • Embodiment 2 is a schematic structural view of a regenerative apparatus provided in Embodiment 2. This embodiment is provided on the basis of the final stage extraction port 1, the final stage extraction steam 10, the final stage feed water heater 11, and the main steam line 2.
  • An additional pipe 01, a steam side regulating valve 02 on the additional pipe, an additional adjustable rear final stage feed water heater 03, and a water side regulating valve 6 are provided.
  • the difference between this embodiment and the embodiment 1 is that a water side regulating valve 6 is added, which is connected in parallel with the additional adjustable rear final stage feed water heater 03. Therefore, the additional adjustable rear final stage feed water heater 03 can be designed as a partial capacity. The feed water heater reduces the cost of the heater.
  • the method of using the regenerative apparatus of the present embodiment differs from that of the first embodiment in that the feed water temperature is the feed water temperature after the additional adjustable rear stage feed water heater 03 outlet and the water side regulating valve 6 outlet are mixed. The rest are consistent and will not be described here.
  • FIG. 3 is a schematic structural view of a regenerative apparatus provided in Embodiment 3.
  • the isolation valve 04' and the final stage water supply are provided at the final stage extraction port 1, the final stage extraction steam 10, and the final stage extraction stage 10.
  • an additional pipe 01, a steam side regulating valve 02 on the additional pipe, and an isolation valve 04 are added.
  • the difference between this embodiment and the first embodiment is that there is no additional adjustable rear final stage feed water heater 03, and an additional isolation valve 04 is added to the additional pipeline to facilitate the high load operation of the unit, such as when the heat recovery device is not required.
  • the isolation valve 04 can be used to close, and when the unit load is low to a preset level or when the unit is started, the final feed water temperature cannot meet the requirements of the denitration device operation. At this time, the isolation valve 04 can be switched to the present.
  • the heat recovery device at the same time, closes the isolation valve 04' on the final stage extraction steam, and uses the main steam to throttle through the regulating valve 02. Since the main steam pressure itself is high, sufficient feed water temperature can be ensured.
  • the rest of the method for using the regenerative device of this embodiment is the same as that of Embodiment 1, and details are not described herein again.
  • the regenerative device of the present application may have various combinations according to whether the water side regulating valve is disposed on the water side, whether the additional adjustable rear final stage feed water heater is provided, and the adjustable adjustable rear final stage feed water heater has different capacities.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

L'invention concerne un dispositif de récupération de chaleur comprenant un tuyau de vapeur primaire (2), un tuyau auxiliaire (01), un dispositif de chauffage d'alimentation en eau, ainsi qu'une vanne de régulation côté vapeur (02) disposée sur le tuyau auxiliaire (01), ladite vanne (02) étant configurée pour réguler la vapeur primaire dans le tuyau auxiliaire (01) de sorte à réguler la pression d'extraction de vapeur derrière la vanne de régulation côté vapeur (02) afin que la température de sortie du dispositif de chauffage d'alimentation en eau soit régulée, ce qui permet d'atteindre une température d'alimentation en eau prédéfinie.
PCT/CN2018/095071 2017-08-31 2018-07-10 Dispositif de récupération de chaleur Ceased WO2019042020A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710776181.0 2017-08-31
CN201710776181.0A CN107388231B (zh) 2017-08-31 2017-08-31 一种回热系统

Publications (1)

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WO2019042020A1 true WO2019042020A1 (fr) 2019-03-07

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CN (1) CN107388231B (fr)
WO (1) WO2019042020A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116498955A (zh) * 2023-05-04 2023-07-28 北票发电有限责任公司 高温网疏水自动控制方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388231B (zh) * 2017-08-31 2024-12-10 冯煜珵 一种回热系统
CN113623634A (zh) * 2021-09-06 2021-11-09 江苏慧峰仁和环保科技有限公司 一种大幅提高电站锅炉低负荷给水温度的系统
CN114961904A (zh) * 2022-06-27 2022-08-30 内蒙古卓安电力科技有限公司 一种机组热力系统

Citations (9)

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Publication number Priority date Publication date Assignee Title
JPS58108396A (ja) * 1981-12-23 1983-06-28 Babcock Hitachi Kk 熱交換器の保護装置
CN102537933A (zh) * 2011-12-30 2012-07-04 冯伟忠 一种用于汽轮发电机组的可调式给水回热系统
CN202852791U (zh) * 2011-12-30 2013-04-03 冯伟忠 一种用于汽轮发电机组的可调式给水回热系统
CN103335301A (zh) * 2013-05-17 2013-10-02 西安交通大学 一种火电机组低负荷给水加热系统
CN204494368U (zh) * 2014-11-20 2015-07-22 冯伟忠 一种用于火力发电厂的可调式给水回热系统
CN106051737A (zh) * 2016-07-30 2016-10-26 冯伟忠 一种可调式给水回热系统及控制方法
CN205878127U (zh) * 2016-07-30 2017-01-11 冯伟忠 一种可调式给水回热系统
CN107388231A (zh) * 2017-08-31 2017-11-24 冯煜珵 一种回热系统
CN207214024U (zh) * 2017-08-31 2018-04-10 冯煜珵 一种回热系统

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Publication number Priority date Publication date Assignee Title
GB627837A (en) * 1945-03-23 1949-08-17 Sulzer Ag Improvements in or relating to steam power plants provided with feed water preheaters and feed water accumulators
CN106224935A (zh) * 2016-09-07 2016-12-14 上海量朝能源科技有限公司 提高锅炉给水温度的装置及其方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108396A (ja) * 1981-12-23 1983-06-28 Babcock Hitachi Kk 熱交換器の保護装置
CN102537933A (zh) * 2011-12-30 2012-07-04 冯伟忠 一种用于汽轮发电机组的可调式给水回热系统
CN202852791U (zh) * 2011-12-30 2013-04-03 冯伟忠 一种用于汽轮发电机组的可调式给水回热系统
CN103335301A (zh) * 2013-05-17 2013-10-02 西安交通大学 一种火电机组低负荷给水加热系统
CN204494368U (zh) * 2014-11-20 2015-07-22 冯伟忠 一种用于火力发电厂的可调式给水回热系统
CN106051737A (zh) * 2016-07-30 2016-10-26 冯伟忠 一种可调式给水回热系统及控制方法
CN205878127U (zh) * 2016-07-30 2017-01-11 冯伟忠 一种可调式给水回热系统
CN107388231A (zh) * 2017-08-31 2017-11-24 冯煜珵 一种回热系统
CN207214024U (zh) * 2017-08-31 2018-04-10 冯煜珵 一种回热系统

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116498955A (zh) * 2023-05-04 2023-07-28 北票发电有限责任公司 高温网疏水自动控制方法

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