WO2020073613A1 - Dispositif et procédé de désulfuration et de réduction de consommation de gaz de combustion dans une installation de moteur thermique - Google Patents

Dispositif et procédé de désulfuration et de réduction de consommation de gaz de combustion dans une installation de moteur thermique Download PDF

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Publication number
WO2020073613A1
WO2020073613A1 PCT/CN2019/078658 CN2019078658W WO2020073613A1 WO 2020073613 A1 WO2020073613 A1 WO 2020073613A1 CN 2019078658 W CN2019078658 W CN 2019078658W WO 2020073613 A1 WO2020073613 A1 WO 2020073613A1
Authority
WO
WIPO (PCT)
Prior art keywords
desulfurization
flue gas
slurry
consumption reduction
thermal power
Prior art date
Application number
PCT/CN2019/078658
Other languages
English (en)
Chinese (zh)
Inventor
李申强
付青梅
李芷冰
李芷蓓
王巍
Original Assignee
李申强
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201811169387.8A external-priority patent/CN109157968A/zh
Priority claimed from CN201811485057.XA external-priority patent/CN109631071A/zh
Application filed by 李申强 filed Critical 李申强
Publication of WO2020073613A1 publication Critical patent/WO2020073613A1/fr

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Classifications

    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters

Definitions

  • the invention relates to the field of industrial waste gas environmental protection in thermal power plants, in particular to a device and method for flue gas desulfurization and consumption reduction in thermal power plants.
  • the present invention provides a device for flue gas desulfurization and consumption reduction in thermal power plants.
  • the device includes: demister, cooling spray layer, slurry spray layer, desulfurization tower, clean flue, desulfurization Circulation pump, slurry heat exchanger (cooler), cooling slurry circulation pump; after the flue gas enters the desulfurization tower, it passes through the slurry spray layer, cooling spray layer, and demister in sequence, enters the clean flue, and is discharged into the chimney;
  • the outlet of the slurry heat exchanger (cooler) is connected to the cooling spray layer, one inlet is connected to the cooling liquid return pipe of the desulfurization tower; the outlet of the desulfurization circulating pump is connected to the slurry spray layer, and the inlet is connected to the slurry return pipe of the desulfurization tower ; It is characterized by: it also includes: flow control pump, calcium hydroxide slurry pool, the input end of the flow control pump is connected to the calcium hydro
  • the slurry spray layer is five layers, and there are five corresponding desulfurization circulation pumps, and each layer of the slurry spray layer corresponds to one desulfurization circulation pump of the desulfurization circulation pump.
  • the output end of the flow control pump is connected to the inlet end of the cooling slurry circulation pump.
  • the output end of the flow control pump is connected to the inlet end of the desulfurization circulation pump corresponding to the highest layer of the slurry spray layer.
  • the calcium hydroxide concentration of the calcium hydroxide slurry pool is controlled to 10-15%.
  • the flow rate of the cooling slurry controlled by the slurry heat exchanger is one fifth of the flow rate of the desulfurization circulating pump, so as to reduce the erosion corrosion of the heat exchanger.
  • the flow control pump controls the flow rate of the calcium hydroxide slurry to 100-400 kg / h.
  • the device for flue gas desulfurization and consumption reduction of a thermal power plant of the present invention further includes a chimney sleeve heater provided on the outer side wall of the chimney, and the sleeve heater is provided with a steam interface for steam and exhaust condensation Water-repellent interface.
  • a plurality of reinforcing plates are provided in the cavity formed by the inner wall of the sleeve heater and the outer wall of the flue.
  • the steam interface is connected to the low-pressure steam extraction steam source of the steam turbine, and the low-pressure steam extraction steam source of the steam turbine is used to heat the sleeve heater, thereby heating the flue sleeved in the sleeve heater, and the flue gas is heated up. , So that the white smoke is completely eliminated; the low-pressure exhausted air after the heat exchange is condensed into condensed water and discharged through the hydrophobic interface.
  • the working pressure of the sleeve heater is ⁇ 0.4 MPa
  • the steam flux of the low-pressure extraction steam source in winter is 10-14 t / h
  • summer is 3-4.2 t / h.
  • the present invention also provides a method for flue gas desulfurization and consumption reduction in thermal power plants, which is characterized in that the method includes the following steps:
  • the flue gas enters the desulfurization tower; the flue gas is desulfurized with limestone slurry for the first time; the secondary desulfurization with calcium hydroxide slurry of a certain concentration; the flue gas is cooled; the flue gas is defogged; Treatment; finally discharge the standard gas.
  • the flue gas is heated by a chimney sleeve heater provided on the outer side wall of the chimney, thereby eliminating white smoke.
  • the advantages of the present invention are: for the traditional desulfurized limestone-gypsum method, since limestone is an insoluble weak acid salt, the reaction speed with sulfur dioxide is slow, and the power consumption of the desulfurization circulating pump is large and the cost is high.
  • a certain concentration of calcium hydroxide solution is used for secondary desulfurization, and under different flow control of different calcium hydroxide solutions, it replaces 1 ⁇ 2 desulfurization circulating pumps, so as to achieve the purpose of desulfurization and energy saving;
  • the sleeve heater on the outer wall of the duct leads into the low-pressure steam extraction steam source of the steam turbine to make the flue gas warm up to completely eliminate the white smoke.
  • FIG. 1 is a schematic structural view of the device of the present invention.
  • the invention provides a device for desulfurization and consumption reduction of flue gas in a thermal power plant, which includes: a demister 1, a cooling spray layer 2, a slurry spray layer 3, a desulfurization tower 4, a clean flue 5, a desulfurization circulating pump 6, and a slurry heat exchange (Cooler) 7, cooling slurry circulation pump 8, flow control pump 9, calcium hydroxide slurry pool 10;
  • the outlet of the slurry heat exchanger (cooler) 7 is connected to the cooling spray layer 2, an inlet is connected to the cooling liquid return pipe of the desulfurization tower 4; the outlet of the desulfurization circulation pump 6 is connected to the slurry spray layer 3, and the inlet is connected to the desulfurization tower
  • the slurry return pipe of 4 is connected; the input end of the flow control pump 9 is connected to the calcium hydroxide slurry tank 10, which is used to transport out the calcium hydroxide slurry of the calcium hydroxide slurry pool 10, and can perform flow control.
  • the slurry spray layer 3 is five layers, and the corresponding desulfurization circulation pump 6 is five. Each layer of the slurry spray layer 3 corresponds to one desulfurization circulation pump 6. Only one layer is marked in the figure, indicating that it corresponds one to one. relationship.
  • the order of the slurry spray layer 3, the cooling spray layer 2, and the demister 1 in the desulfurization tower 4 is in order from bottom to top.
  • a chimney sleeve heater 11 is provided on the outer wall of the chimney, and a chimney sleeve heater 11 is provided with a steam interface for steam and a hydrophobic interface for discharging condensed water .
  • the height of the sleeve heater 11 is 10 m, and it is made of 5mm thick Q235 steel plate.
  • the distance between the outer wall of the sleeve heater 11 and the outer wall of the chimney is 100 mm.
  • the inner wall of the sleeve heater 11 and the outer wall of the chimney are each Reinforcement plates are installed at intervals of about 1m.
  • the rated pressure of the sleeve heater 11 is 0.4 MPa, and the upper part of the outer wall of the sleeve heater 11 is provided with four steam ports with a size of DN100 for entering steam and two hydrophobic ports with a size of DN50 for discharging condensate.
  • the outer wall of the sleeve heater 11 is provided with a non-condensable steam discharge port with a size of DN10 and four safety valves of DN100 and PN0.2 to ensure that the working pressure of the sleeve heater 11 does not exceed 0.3 MPa.
  • the specific working process is: after the flue gas enters the desulfurization tower 4, it passes through the slurry spray layer 3, the cooling spray layer 2, and the demister 1, and then enters the clean flue 5 and is discharged into the chimney sleeve heater 11 for heating , So as to eliminate white smoke, and the smoke reaches the emission standard.
  • the flow control pump 9 controls the flow of calcium hydroxide slurry between 100 ⁇ 400 kg / h.
  • the flow control is between 100 ⁇ 200 kg / h, it can achieve the effect of replacing a desulfurization circulating pump; when the flow control In 300 ⁇ 400 Between kg / h, adding calcium hydroxide slurry to the upper two layers of spraying can achieve the effect of replacing the two bottom desulfurization circulating pumps.
  • Embodiment 1 The output end of the flow control pump 9 is connected to the inlet end of the cooling slurry circulation pump 8.
  • the flue gas enters the desulfurization tower 4 from the flue, and the sulfur dioxide in the flue gas reacts with the slurry spray layer 3 in counter-current contact.
  • the sulfur dioxide concentration in the flue gas decreases and the flue gas temperature decreases.
  • the flue gas passes through the heat exchange with the cooling spray layer 2 added with calcium hydroxide slurry and is desulfurized again with the calcium hydroxide solution.
  • the flue gas temperature decreases and the sulfur dioxide concentration decreases.
  • the flue gas passes through the demister 1 and enters the clean flue 5. Heating in the chimney sleeve heater 11, so as to eliminate white smoke and reach the emission standard.
  • Embodiment 2 The output end of the flow control pump 9 is connected to the inlet end of the desulfurization circulation pump 6 corresponding to the highest layer of the slurry spray layer 3.
  • the flue gas enters the desulfurization tower 4 from the flue, the sulfur dioxide in the flue gas reacts with the non-highest layer of the slurry spray layer 3 in countercurrent contact, the flue gas moves up to the uppermost layer, and the uppermost layer of the slurry spray layer 3 is sprayed with calcium hydroxide slurry Desulfurization reaction with sulfur dioxide in the flue gas again, the flue gas continues to pass through the demister 1, enter the clean flue 5, and is heated in the chimney sleeve heater 11, thereby eliminating white smoke, and the flue gas reaches the emission standard.
  • the invention also includes a method for desulfurization and consumption reduction of flue gas in a thermal power plant.
  • the method includes the following steps:
  • the flue gas enters the desulfurization tower 4; the flue gas is desulfurized with limestone slurry for the first time; the secondary desulfurization with calcium hydroxide slurry of a certain concentration; the flue gas is cooled; the mist is defogged; the flue gas is The chimney sleeve heater 11 is heat-treated to eliminate white smoke; and finally discharges up-to-standard gas.
  • the data of the invention is designed and calculated according to the parameters of the 1000 MW unit.
  • Embodiment 1 the sulfur dioxide in the flue gas reacts with the three-layer (three-use and two-preparation) limestone slurry spray layer counter-current contact reaction, the sulfur dioxide concentration in the flue gas decreases from 2000 mg / m 3 to 50 mg / m 3 , and the flue gas temperature decreases To 49.25 ° C. Then, the flue gas undergoes heat exchange and desulfurization through contact with the cooling spray layer (flow rate 2500 m 3 / h) added with calcium hydroxide slurry, the flue gas temperature drops below 45 °C, and the concentration of sulfur dioxide is below 10 mg / m 3 . After passing through the demister and flue gas heater, it enters the chimney to eliminate the emission of white smoke.
  • the cooling spray layer flow rate 2500 m 3 / h
  • the flue gas enters the desulfurization tower from the flue, and the sulfur dioxide in the flue gas reacts with the three-layer (three-use and two-preparation) limestone slurry spray layer in countercurrent contact reaction, in which the uppermost slurry is added with calcium hydroxide slurry and the uppermost spray layer
  • the concentration of calcium hydroxide is 0.2 mmol / L
  • the concentration of sulfur dioxide in the flue gas is reduced from 2000 mg / m 3 to 15 mg / m 3.
  • the flue gas passes through the demister and enters the chimney sleeve heater for heating, thereby eliminating white smoke. Emission Standards.
  • a desulfurization circulating pump has a flow rate of 12,500 m 3 / h, and a cooling slurry flow of 2500 m 3 / h.
  • the reaction rate of calcium is an order of magnitude faster.
  • the cooling slurry circulating pump power is 350 kw, replacing a desulfurization circulating pump power of 1400 kw, and reducing the desulfurization load by 1050 kw. It can reduce the power consumption of the entire desulfurization system by 20-25%, and the operating cost of the desulfurization system by 10%.
  • the invention discloses a device for desulfurization and consumption reduction of flue gas in a thermal power plant.
  • the device includes a demister, a cooling spray layer, a slurry spray layer, a desulfurization tower, a clean flue, a desulfurization circulation pump, and a slurry heat exchanger (cooler ), Cooling slurry circulation pump, flow control pump, calcium hydroxide slurry pool.
  • the invention adopts a certain concentration of calcium hydroxide solution for secondary desulfurization, and replaces 1 ⁇ 2 desulfurization circulating pumps under different flow control of different calcium hydroxide solutions under different flow control, thereby achieving the purpose of desulfurization and energy saving;
  • the sleeve heater provided on the outer wall of the flue leads into the low-pressure steam extraction source of the steam turbine to make the flue gas warm up to achieve the effect of completely eliminating white smoke.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un dispositif et un procédé de désulfuration et de réduction de consommation de gaz de combustion dans une installation de moteur thermique. Le dispositif comprend : un désembueur (1), une couche de pulvérisation de refroidissement (2), une couche de pulvérisation sériflux (3), une tour de désulfuration (4), un passage de purification de gaz de combustion (5), une pompe de circulation de désulfuration (6), un échangeur de chaleur sériflux (7), une pompe de circulation sériflux refroidie (8), une pompe de régulation de débit (9) et un bassin sériflux d'hydroxyde de calcium (10). Le procédé comprend les étapes suivantes : le gaz de combustion pénètre dans une tour de désulfuration (4) pour une désulfuration primaire par sériflux de calcaire; un gaz de combustion subit une désulfuration secondaire par sériflux d'hydroxyde de calcium; un gaz de combustion subit un refroidissement, un désembuage et un chauffage; et, un gaz standard est déchargé.
PCT/CN2019/078658 2018-10-08 2019-03-19 Dispositif et procédé de désulfuration et de réduction de consommation de gaz de combustion dans une installation de moteur thermique WO2020073613A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201811169387.8 2018-10-08
CN201811169387.8A CN109157968A (zh) 2018-10-08 2018-10-08 一种用于火电厂烟气脱硫降耗的装置及方法
CN201811485057.X 2018-12-06
CN201811485057.XA CN109631071A (zh) 2018-12-06 2018-12-06 一种用于火电厂烟气加热消白烟装置及加热消白烟的方法

Publications (1)

Publication Number Publication Date
WO2020073613A1 true WO2020073613A1 (fr) 2020-04-16

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PCT/CN2019/078658 WO2020073613A1 (fr) 2018-10-08 2019-03-19 Dispositif et procédé de désulfuration et de réduction de consommation de gaz de combustion dans une installation de moteur thermique

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103599690A (zh) * 2013-11-12 2014-02-26 山东中实易通集团有限公司 一种复合型石灰石、氢氧化钙石膏湿法脱硫装置及工艺
CN207230587U (zh) * 2017-09-09 2018-04-13 江苏瑞鼎环境工程有限公司 加热削除白烟的一体式烟囱
CN108273370A (zh) * 2018-03-02 2018-07-13 无锡雪浪环境科技股份有限公司 一种结合烟气脱白的湿式烟气脱硫装置及其使用方法
CN108295633A (zh) * 2018-03-13 2018-07-20 中国华电科工集团有限公司 一种用于火电厂脱硫塔循环浆液冷却消白烟的装置和方法
CN109157968A (zh) * 2018-10-08 2019-01-08 李申强 一种用于火电厂烟气脱硫降耗的装置及方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103599690A (zh) * 2013-11-12 2014-02-26 山东中实易通集团有限公司 一种复合型石灰石、氢氧化钙石膏湿法脱硫装置及工艺
CN207230587U (zh) * 2017-09-09 2018-04-13 江苏瑞鼎环境工程有限公司 加热削除白烟的一体式烟囱
CN108273370A (zh) * 2018-03-02 2018-07-13 无锡雪浪环境科技股份有限公司 一种结合烟气脱白的湿式烟气脱硫装置及其使用方法
CN108295633A (zh) * 2018-03-13 2018-07-20 中国华电科工集团有限公司 一种用于火电厂脱硫塔循环浆液冷却消白烟的装置和方法
CN109157968A (zh) * 2018-10-08 2019-01-08 李申强 一种用于火电厂烟气脱硫降耗的装置及方法

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