WO2021238322A1 - Système de production d'énergie à charbon coopératif efficace, propre et flexible et procédé de fonctionnement - Google Patents

Système de production d'énergie à charbon coopératif efficace, propre et flexible et procédé de fonctionnement Download PDF

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Publication number
WO2021238322A1
WO2021238322A1 PCT/CN2021/078894 CN2021078894W WO2021238322A1 WO 2021238322 A1 WO2021238322 A1 WO 2021238322A1 CN 2021078894 W CN2021078894 W CN 2021078894W WO 2021238322 A1 WO2021238322 A1 WO 2021238322A1
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WIPO (PCT)
Prior art keywords
economizer
flue gas
regulating valve
water
inlet
Prior art date
Application number
PCT/CN2021/078894
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English (en)
Chinese (zh)
Inventor
刘明
严俊杰
刘继平
种道彤
邢秦安
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西安交通大学
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Publication of WO2021238322A1 publication Critical patent/WO2021238322A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

Definitions

  • the invention belongs to the field of coal-fired power generation, and specifically relates to an efficient, clean and flexible coal-fired power generation system and an operation method.
  • coal-fired generating sets need frequent and deep variable load operation.
  • coal-fired generator sets need to have the ability to quickly climb the variable load.
  • the SCR denitrification device is the mainstream denitrification device, but the SCR denitrification catalyst has a suitable operating temperature range.
  • the inlet flue gas temperature of the SCR denitrification device deviates from the operating temperature range of the SCR denitrification catalyst, the denitrification efficiency will be significantly reduced. It is for this reason that the NOx emissions of coal-fired power plants are greatly increased during low-load operation.
  • Existing technologies such as flue gas bypass and water supply bypass generally have the prominent contradiction between high efficiency and cleanliness.
  • the instantaneous denitrification efficiency of the prior art SCR and the efficiency of coal-fired power plants are significantly reduced.
  • the purpose of the present invention is to propose an efficient, clean and flexible coal-fired power generation system and operation method.
  • Flue gas regulating baffle and regulating valve The system can accurately adjust the temperature of the flue gas at the inlet of the SCR to achieve high-efficiency denitrification at a wide load of coal-fired generator sets, and at the same time improve the efficiency of wide-load operation.
  • the system can increase the variable load rate of coal-fired generating sets, and in the process of increasing the variable load rate, improve system efficiency and SCR denitrification efficiency.
  • a high-efficiency, clean and flexible coal-fired power generation system including economizer 2, SCR denitrification device 3 and front economizer 4 arranged in the tail flue of boiler 1 in sequence along the flue gas flow direction, front economizer 4 and rear flue gas
  • the duct is divided into two parallel separated flues. One side of the separated flue is arranged in sequence along the flue gas flow direction with the No. 1 flue gas baffle 51 and the air preheater 53, and the other side is arranged in sequence along the flue gas flow direction with No. 2 flue gas baffle 52.
  • the No. 1 feedwater regulating valve 61 is connected to the water inlet of the front economizer 4; the water inlet of the front economizer 4 is connected to the water outlet of the No. 1 split economizer 54, and it is also connected to the high-pressure heater group through the No. 2 feedwater regulating valve 62 7 water outlet is connected; No. 1 split economizer 54 water inlet is connected to No. 2 split economizer 55 water outlet, and also connected to the 7 water outlet of the high pressure heater group through No.
  • the area of the front economizer 4 is 0.2 to 0.4 times the area of the economizer 2.
  • the area of the first split economizer 54 is 0.5 to 0.8 times the area of the second split economizer 55.
  • the No. 1 water supply regulating valve 61, the No. 2 water supply regulating valve 62, the No. 3 water supply regulating valve 63 and the No. 4 water supply regulating valve 64 are electric automatic regulating valves.
  • the inlet flue gas temperature of the SCR denitrification device 3 is adjusted to meet the working temperature range of the SCR denitrification device 3 by adjusting the No. 1 feedwater regulating valve 61.
  • the specific adjustment method is, measuring The inlet flue gas temperature of the SCR denitrification device 3, if the flue gas temperature at the inlet of the SCR denitrification device 3 is measured higher than the maximum working temperature of the SCR denitrification device 3, increase the opening degree of the No. 1 feedwater regulating valve 61; measure the SCR denitrification device 3 If the inlet flue gas temperature of SCR is lower than the working temperature of SCR denitrification device 3, reduce the opening degree of No. 1 feedwater regulating valve 61;
  • the temperature of the flue gas at the tail flue gas outlet of the boiler 1 is the lowest.
  • the flue gas flow of the No. 2 flue gas baffle 52 accounts for 20%-40% of the total flue gas flow.
  • the operating temperature range of the SCR denitrification device 3 is 300°C to 400°C.
  • the system of the present invention adopts the arrangement mode of separating parallel flues and grading economizers, and is equipped with flue gas regulating baffles and regulating valves.
  • the system can accurately adjust the temperature of the flue gas at the inlet of the SCR to achieve high-efficiency denitrification in a wide load of coal-fired generator sets, and at the same time improve the efficiency of wide-load operation.
  • the system of the present invention can increase the variable load rate of the coal-fired generator set, and in the process of increasing the variable load rate, improve the system efficiency and the SCR denitrification efficiency.
  • the present invention has the following advantages:
  • the present invention can expand the denitrification operation range of the SCR system, and can realize high-efficiency denitrification in all working conditions;
  • the present invention can increase boiler efficiency by 0.3% to 0.8%;
  • the present invention can realize the variable load operation of coal-fired generator set at 3% or more of rated load/min, and at the same time improve the power generation efficiency and denitrification efficiency of the coal-fired generator set during fast variable load operation.
  • Figure 1 is a schematic diagram of the system structure of the present invention.
  • Figure 2 is a comparison diagram of the flue gas temperature at the inlet of the SCR of the present invention for a coal-fired generator set.
  • Fig. 3 is a graph showing the change trend of output power of a case coal-fired generator set using the present invention.
  • an efficient, clean and flexible coal-fired power generation system of the present invention includes an economizer 2, an SCR denitrification device 3, and a pre-economizer 4 sequentially arranged in the tail flue of the boiler 1 along the flue gas flow direction.
  • the flue after the pre-economizer 4 is divided into two parallel separated flues. One side of the separated flue is arranged in sequence along the flue gas flow direction with the No. 1 flue gas baffle 51 and the air preheater 53, and the other side is along the flue gas flow direction.
  • the economizer 2 water outlet is connected to the water wall feedwater inlet, and the economizer 2 water inlet is connected to the front economizer
  • the water outlet of the device 4 is connected, and the water inlet of the pre-economizer 4 is connected through the No. 1 water supply regulating valve 61; the water inlet of the pre-economizer 4 is connected to the water outlet of the No. 1 split economizer, and the water outlet is also connected through the No. 2 water supply
  • the regulating valve 62 is connected to the 7 water outlet of the high pressure heater group; the water inlet of the No. 1 split economizer 54 is connected to the water outlet of the No.
  • the area of the pre-economizer 4 is 0.2 to 0.4 times the area of the economizer 2, so that the inlet flue gas temperature of the SCR denitrification device 3 can be maintained at an appropriate level within the full range of operating conditions. Working temperature zone.
  • the area of the first split economizer 54 is 0.5 to 0.8 times the area of the second split economizer 55, which can improve the matching relationship between the flue gas heat release and the working fluid system, and improve System energy utilization efficiency, and reduce system investment.
  • the first feedwater regulating valve 61, the second feedwater regulating valve 62, the third feedwater regulating valve 63, and the fourth feedwater regulating valve 64 are electric automatic regulating valves, which can enhance the control performance of the system .
  • the inlet flue gas temperature of the SCR denitrification device 3 is adjusted to meet the working temperature range of the SCR denitrification device 3 by adjusting the No. 1 feedwater regulating valve 61, and the specific adjustment method is as follows: , Measure the inlet flue gas temperature of the SCR denitrification device 3, if the flue gas temperature at the inlet of the SCR denitrification device 3 is higher than the maximum operating temperature of the SCR denitrification device 3, increase the opening of the No. 1 feedwater regulating valve 61; measure the SCR denitrification If the inlet flue gas temperature of the device 3 is lower than the working temperature of the SCR denitrification device 3, reduce the opening degree of the No. 1 feedwater regulating valve 61;
  • the temperature of the flue gas at the tail flue gas outlet of the boiler 1 is the lowest.
  • the operating temperature range of the SCR denitrification device 3 is 300°C to 400°C.
  • the flue gas flow of the second flue gas baffle 52 accounts for 20%-40% of the total flue gas flow, so that the boiler can have the highest operating efficiency.
  • the system of the present invention can switch the system configuration when the unit is operating in different intervals, so as to maintain the temperature of the flue gas at the inlet of the SCR in the operation interval where the activity of the SCR denitration catalyst is most suitable.
  • a coal-fired generating set adopts the system and operation method of the present invention. After calculation, the temperature of the flue gas at the inlet of the SCR can be controlled above 320°C within the entire load rate range of 0.3 to 1.0.
  • the invention can improve the efficiency of the coal-fired generator set, maintain the boiler efficiency above 92% at various load rates, and improve the boiler efficiency by 0.3% to 0.8% compared with the flue gas bypass technology.
  • the present invention can increase the climbing rate of the unit.
  • a coal-fired generating set adopts the system and operation method of the present invention.
  • the variable load rate can be increased to more than 3% of the rated load/min. Adjusting the opening of the relevant valve can ensure the denitration efficiency of the SCR device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Chimneys And Flues (AREA)

Abstract

L'invention concerne un système de production d'énergie à charbon coopératif efficace, propre et flexible et un procédé de fonctionnement. Le système comprend un économiseur de charbon (2), un dispositif de dénitration SCR (3) et un économiseur de charbon avant (4) qui sont agencés séquentiellement dans un carneau résiduaire d'une chaudière (1) le long de la direction d'écoulement de gaz de fumée. Un carneau arrière de l'économiseur de charbon avant (4) est divisé en deux conduits de séparation parallèles, un premier déflecteur de gaz de fumée (51) et un préchauffeur d'air (53) sont agencés séquentiellement sur le carneau de séparation sur un côté le long de la direction d'écoulement de gaz de fumée, et un second déflecteur de gaz de fumée (52), un premier économiseur de charbon à division d'écoulement (54) et un second économiseur de charbon à division d'écoulement (55) sont agencés séquentiellement sur le conduit de séparation de l'autre côté le long de la direction d'écoulement de gaz de fumée ; une sortie d'eau de l'économiseur de charbon (2) est reliée à une entrée d'alimentation en eau d'une paroi de refroidissement à l'eau, et une entrée d'eau de l'économiseur de charbon (2) est relié à une sortie d'eau de l'économiseur de charbon avant (4) et à une entrée d'eau de l'économiseur de charbon avant (4) au moyen d'une première vanne de régulation d'alimentation en eau (61) ; l'entrée d'eau de l'économiseur de charbon avant (4) est relié à une sortie d'eau du premier économiseur de charbon à division d'écoulement (54) et à une sortie d'eau d'un groupe de chauffage haute pression (7) au moyen d'une seconde vanne de régulation d'alimentation en eau (62) ; une entrée d'eau du premier économiseur de charbon à division d'écoulement (54) est relié à une sortie d'eau du second économiseur de charbon à division d'écoulement (55), et à la sortie d'eau du groupe de chauffage haute pression (7) au moyen d'une troisième vanne de régulation d'alimentation en eau (63) ; une entrée d'eau du second économiseur de charbon à division d'écoulement (55) est reliée à une sortie d'eau d'une pompe d'alimentation en eau (8) au moyen d'une quatrième vanne de régulation d'alimentation en eau (64) ; et une entrée d'eau du groupe de chauffage haute pression (7) est reliée à une sortie d'eau de la pompe d'alimentation en eau (8).
PCT/CN2021/078894 2020-05-24 2021-03-03 Système de production d'énergie à charbon coopératif efficace, propre et flexible et procédé de fonctionnement WO2021238322A1 (fr)

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CN202010445473.8A CN111603928B (zh) 2020-05-24 2020-05-24 一种高效清洁灵活协同燃煤发电系统及运行方法
CN202010445473.8 2020-05-24

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CN111603928B (zh) * 2020-05-24 2021-07-06 西安交通大学 一种高效清洁灵活协同燃煤发电系统及运行方法

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US10197267B2 (en) * 2012-02-01 2019-02-05 The Babcock & Wilcox Company Split pass economizer bank with integrated water coil air heating and feedwater biasing
CN103084064A (zh) * 2013-01-18 2013-05-08 广东电网公司电力科学研究院 一种用于提高电厂scr脱硝装置运行能力的系统和方法
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