WO2020191565A1 - Integrated multifunctional flue gas waste heat recovery tower - Google Patents

Integrated multifunctional flue gas waste heat recovery tower Download PDF

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Publication number
WO2020191565A1
WO2020191565A1 PCT/CN2019/079419 CN2019079419W WO2020191565A1 WO 2020191565 A1 WO2020191565 A1 WO 2020191565A1 CN 2019079419 W CN2019079419 W CN 2019079419W WO 2020191565 A1 WO2020191565 A1 WO 2020191565A1
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WO
WIPO (PCT)
Prior art keywords
flue gas
recovery tower
desulfurization
spray layer
waste heat
Prior art date
Application number
PCT/CN2019/079419
Other languages
French (fr)
Chinese (zh)
Inventor
王海超
吴小舟
刘哲毅
端木琳
李祥立
Original Assignee
大连理工大学
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Application filed by 大连理工大学 filed Critical 大连理工大学
Priority to PCT/CN2019/079419 priority Critical patent/WO2020191565A1/en
Publication of WO2020191565A1 publication Critical patent/WO2020191565A1/en

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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
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen 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
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • 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
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Definitions

  • the invention belongs to the technical field of recovery and utilization of flue gas waste heat of thermal power plant boilers, and particularly relates to a high-efficiency multifunctional flue gas waste heat recovery tower integrating desulfurization and denitrification, dust removal and condensed water recovery.
  • the country has attached great importance to energy conservation and emission reduction. How to improve the thermal efficiency of the boiler and make full use of the waste heat of the boiler flue gas has become one of the research hotspots.
  • the exhaust gas temperature of industrial coal-fired boilers is generally not lower than 180°C, even as high as 250°C.
  • the high-temperature flue gas discharged wastes a lot of heat energy and also pollutes the surrounding atmospheric environment. If the flue gas waste heat recovery tower is used to spray and condense the low-temperature flue gas, the flue gas and the spray water can be directly contacted for heat exchange, and the boiler exhaust gas temperature can be reduced to the dew point temperature and below, and the water vapor in the flue gas can be condensed and released.
  • the purpose of the present invention is to provide a high-efficiency multifunctional flue gas waste heat recovery tower integrating desulfurization, denitrification, dust removal and condensate water recovery, which can effectively remove SO 2 , NO X and smoke dust in the flue gas, greatly reducing It reduces the pollution of the flue gas to the atmosphere, and at the same time recovers the waste heat of the flue gas, reducing investment costs.
  • An efficient and multifunctional flue gas waste heat recovery tower integrating desulfurization, denitrification, dust removal and condensate water recovery, including a dust collector 2, a recovery tower body 3, a denitrification agent delivery pump 28, a denitrification agent solution tank 11, and a desulfurization agent delivery pump 26 , Desulfurizer solution tank 12 and plate heat exchanger 30, in which:
  • the main body 3 of the recovery tower is provided with a slurry circulation pool, a flue gas inlet, a packing layer 4, a desulfurization spray layer 5, an inclined baffle 10, a flue gas inlet separator 6, a flue gas distributor 7, and a denitration from bottom to top.
  • the flue gas inlet is arranged near the bottom of the recovery tower body 3, and the dust collector 2 is connected to the flue gas inlet. After dust is removed by the dust collector 2, the flue gas enters the flue gas inlet Inside the main body 3 of the recovery tower,
  • the packing layer 4 is horizontally arranged in the recovery tower body 3, the packing layer 4 is located above the flue gas inlet, and a desulfurization spray layer 5 is horizontally arranged above the packing layer 4, and the packing layer 4 has In the gap, the dust-removed flue gas entering from the flue gas inlet contacts the surface of the filler in the filler layer 4 with the desulfurizing agent sprayed by the desulfurization spray layer 5 to desulfurize the dust-removed flue gas,
  • the inclined baffle 10 is arranged above the desulfurization spray layer 5, the flue gas inlet separator 6 is fixed on the upper surface of the inclined baffle 10, and the desulfurized flue gas passes through the flue gas inlet separator 6 It flows up to above the inclined baffle 10.
  • the flue gas inlet separator 6 is a gas-water separator, which is composed of many baffles. The fluid changes its flow direction many times in the flue gas inlet separator 6 due to the suspended droplets With greater mass and inertia, when the flow direction of the baffle changes, the flue gas bypasses the baffle and continues forward, and the water droplets will accumulate on the baffle, and finally fall to the bottom of the inclined baffle 10, passing through the trap discharge;
  • a flue gas distributor 7 is horizontally arranged above the flue gas inlet gas distributor 6 to evenly distribute the desulfurized flue gas to flow upwards,
  • the denitrification spray layer 8 is horizontally arranged in the recovery tower body 3, above the flue gas distributor 7, and the denitrification agent sprayed by the denitrification spray layer 8 passes through the flue gas distributor 7 The flue gas flowing upward is denitrified, and the denitrification agent sprayed by the denitrification spray layer 8 is discharged to the outside of the recovery tower body 3 through the inclined baffle 10;
  • the demister 9 is horizontally arranged in the recovery tower main body 3, above the denitration spray layer 8.
  • the denitrated flue gas passes through the demister 9 to remove water mist, and is removed from the The flue gas outlet above the mist eliminator 9 is discharged,
  • the denitration agent solution tank 11 is connected to the denitration spray layer 8 through a denitration agent delivery pump 28 to provide the denitration spray layer 8 with a denitration agent,
  • the desulfurization agent solution tank 12 is connected to the slurry circulation pool at the bottom of the recovery tower body 3 through the desulfurization agent delivery pump 26, and the desulfurization agent solution tank 12 is used to provide the desulfurization agent in the slurry circulation pool; a circulating spray is provided at the bottom of the waste heat recovery tower 3.
  • a circulating spray is provided at the bottom of the waste heat recovery tower 3.
  • part of the condensed water from the flue gas and desulfurization slurry is composed of circulating spray water, which is discharged from the circulating spray water outlet, and is driven by the waste heat recovery tower circulating water pump 13 to return to the desulfurization spray layer 5 in the tower for circulating spraying.
  • the circulating spray water After the circulating spray water is cooled by the heat exchange of the plate heat exchanger 30, it flows out from the spray water side outlet of the plate heat exchanger 30 and returns to the desulfurization spray layer 5 in the tower for circulating spraying.
  • the plate heat exchanger 30 needs regular maintenance. There are multiple valves on the spray water side to realize that the circulating spray water directly enters the desulfurization spray layer 5 for circulating spraying.
  • the plate heat exchanger 30 simultaneously transfers the heat in the circulating spray water to the heating network return water, and the heating network return water enters the heating network heater for further heating, and sends it to the heating network after reaching the operating requirements;
  • a bypass pipeline is provided between the outlet pipe of the dust collector 2 and the inlet pipe of the chimney 25, on which a flue gas bypass pipe valve K1, and the flue gas bypass pipe valve K1 fails in the waste heat recovery tower 3 or It is turned on during maintenance, and the high-temperature flue gas is directly discharged through the chimney 25 after being dedusted by the dust collector 2.
  • a denitration agent delivery valve 29 is provided between the denitrification agent delivery pump 28 and the denitrification agent solution tank 11 to control the pumping of the denitration agent; between the desulfurization agent delivery pump 26 and the desulfurization agent solution tank 12 A desulfurizing agent delivery valve 27 is provided on the pipeline to control the pumping of the desulfurizing agent.
  • the desulfurizing agent is a NaOH solution with a concentration of 50% by mass; the denitration agent is H 2 O 2 with a concentration of 27.5% by mass.
  • the main body 3 of the recovery tower is integrally cast, and the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 are all provided with a support frame on the lower side, It is used to fix the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 in the recovery tower body 3, respectively.
  • the high-efficiency and multifunctional flue gas waste heat recovery tower utilizes the heat energy in the flue gas to a great extent, realizes the organic combination of energy saving and environmental protection, and has a high degree of integration and saves equipment space.
  • the area is greatly reduced, and it can be widely used in industrial boiler houses, thermal power plants, and other desulfurization, denitrification and flue gas waste heat utilization projects.
  • Figure 1 is a system diagram of an efficient and multifunctional flue gas waste heat recovery tower in an embodiment of the present invention.
  • connection not only refers to a direct connection between components, but also refers to a connection between components through other elements such as pipelines.
  • FIG. 1 is a system diagram of an efficient and multifunctional flue gas waste heat recovery tower in an embodiment of the present invention.
  • a high-efficiency and multifunctional flue gas waste heat recovery tower is provided, which includes a dust collector 2, a recovery tower body 3, a denitrification agent delivery pump 28, a denitrification agent solution tank 11, and a desulfurization agent delivery pump 26.
  • the main body 3 of the recovery tower is provided with a slurry circulation pool, a flue gas inlet, a packing layer 4, a desulfurization spray layer 5, an oblique baffle 10, a flue gas inlet separator 6, a flue gas distributor 7, and a denitration spray from bottom to top.
  • the flue gas produced by the boiler 1 passes through the dust collector 2 under the action of the induced draft fan, and the dust-removed flue gas is connected to the flue gas inlet of the recovery tower body 3 through the waste heat recovery tower inlet valve K1 through the flue gas pipeline.
  • the flue gas pipe from the dust collector 2 is connected to the pipe entering the chimney 25 through the bypass pipe valve K2 through the flue gas bypass pipe.
  • the flue gas inlet is arranged near the bottom of the recovery tower main body 3, and the dust collector 2 is connected with the flue gas inlet. After dust is removed by the dust collector 2, the flue gas enters the recovery tower main body 3 from the flue gas inlet.
  • the packing layer 4 is horizontally arranged in the main body 3 of the recovery tower, the packing layer 4 is located above the flue gas inlet, and the desulfurization spray layer 5 is horizontally arranged above the packing layer 4.
  • the packing layer 4 has gaps, and the dedusted smoke entering from the flue gas inlet
  • the desulfurization agent sprayed by the gas and the desulfurization spray layer 5 contacts the surface of the filler in the filler layer 4 to desulfurize the dust-removed flue gas.
  • the inclined baffle 10 is arranged above the desulfurization spray layer 5, and the flue gas inlet distributor 6 is fixed on the upper surface of the inclined baffle 10, and the desulfurized flue gas flows upward through the flue gas inlet distributor 6 to above the inclined baffle 10.
  • the setting of the inclined baffle 10 is convenient for draining the denitration spray liquid outside and reusing it after treatment.
  • the angle between the inclined baffle 10 and the horizontal plane is 6°.
  • the oblique baffle 10 is arranged above the desulfurization spray layer 5, the flue gas inlet separator 6 is fixed on the upper surface of the oblique baffle 10, and the desulfurized flue gas flows up to the oblique baffle 10 through the flue gas inlet separator 6
  • the flue gas inlet separator 6 is a gas-water separator, which is composed of many baffles. The fluid changes its flow direction many times in the flue gas inlet separator 6.
  • a flue gas distributor 7 is horizontally arranged above the flue gas inlet separator 6 to evenly distribute the desulfurized flue gas to flow upward.
  • the denitrification spray layer 8 is horizontally arranged in the main body 3 of the recovery tower, above the flue gas distributor 7, and the denitrification agent sprayed by the denitrification spray layer 8 is used to denitrate the flue gas flowing upward through the flue gas distributor 7.
  • the denitration agent sprayed by the spray layer 8 is discharged to the outside of the recovery tower body 3 through the inclined baffle 10.
  • the demister 9 is horizontally arranged in the recovery tower body 3, above the denitration spray layer 8.
  • the denitrated flue gas passes through the demister 9 to remove water mist, and is discharged from the flue gas outlet arranged above the demister 9 .
  • the flue gas outlet is connected to the chimney 25, and the flue gas is discharged through the chimney 25.
  • the sulfur and nitrogen content in the flue gas meets national emission standards and then is discharged into the atmosphere.
  • the denitration agent solution tank 11 is connected to the denitration spray layer 8 through a denitration agent delivery pump 28 to provide a denitration agent to the denitration spray layer 8.
  • a denitration agent delivery valve 29 is provided between the denitration agent delivery pump 28 and the denitration agent solution tank 11 to control the pumping of the denitration agent.
  • the desulfurization agent solution tank 12 is connected to the slurry circulation pool at the bottom of the recovery tower body 3 through the desulfurization agent delivery pump 26.
  • the desulfurization agent solution tank 12 is used to provide the desulfurization agent in the slurry circulation pool; the bottom of the waste heat recovery tower 3 is provided with circulating spray water At the outlet, part of the condensed water precipitated by the flue gas and the desulfurization slurry constituted circulating spray water is discharged from the circulating spray water outlet, and is driven by the waste heat recovery tower circulating water pump 13 to return to the desulfurization spray layer 5 in the tower for cyclic spraying.
  • the pipeline between the desulfurizer delivery pump 26 and the desulfurizer solution tank 12 is provided with a desulfurizer delivery valve 27 to control the pumping of the desulfurizer.
  • the desulfurizing agent is a NaOH solution with a mass percentage of 50%.
  • the denitration agent is H 2 O 2 with a mass percentage of 27.5%, which has high denitration efficiency, relatively low price, and no secondary pollution.
  • the recovery tower body 3 is integrally cast and molded, and the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 are all provided with supports on the lower side
  • the rack is used to fix the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 in the recovery tower body 3, respectively.
  • the circulating spray water is driven by a water pump and circulates between the plate heat exchanger 30 and the waste heat recovery tower 3.
  • the upper part of the waste heat recovery tower 3 is provided with a spray circulating water inlet, and the lower part is provided with a spray circulating water outlet.
  • the outlet is connected with the heat medium inlet of the plate heat exchanger 30.
  • the heat medium outlet of the plate heat exchanger 30 passes through the spray pipe, The valve is connected to the inlet of the spray circulating water, thus forming a closed loop.
  • the circulating spray water After the circulating spray water is cooled by the heat exchange of the plate heat exchanger 30, it passes through the valve, the desulfurizer circulating pump 13, and multiple valves to enter the spray water side of the plate heat exchanger 30. After the heat exchange, it flows from the plate heat exchanger 30.
  • the spray water side outlet flows out, and is controlled by multiple valves to return to the desulfurization spray layer 5 in the tower for cyclic spraying.
  • the valves on the inlet pipe and outlet pipe of the spray water side are closed, and the valve between the inlet pipe and the outlet pipe is opened, so that the circulating spray water directly enters the desulfurization spray layer 5 for processing. Spray cyclically.
  • the plate heat exchanger 30 simultaneously transfers the heat in the circulating spray water to the heating network return water, and the heating network return water enters the heating network heater for further heating, and sends it to the heating network after meeting the operating requirements.
  • the plate heat exchanger 30 is used for cooling by spraying water, and at the same time, the return water of the heating heating network, the return water of the heating network is heated by the plate exchange, and then enters the heating network heater for further heating, and then is sent to the heating network after reaching the operating requirements.
  • the operating temperature of the high-efficiency multifunctional flue gas waste heat recovery tower integrating desulfurization, denitrification, dust removal and condensed water recovery provided by the present invention is 38 ⁇ 100°C, the operating temperature range is wider, and the desulfurization and denitrification efficiency is stable, reaching The emission requirements of related pollutants in the Pollutant Emission Standard and the Comprehensive Air Pollutant Emission Standard.
  • the flue gas waste heat recovery tower provided by the present invention can simultaneously realize multiple functions such as desulfurization, de-sales, further dust reduction, waste heat recovery, and condensed water recovery, etc., can reduce pollutant discharge, has a small floor area, has good desulfurization and de-sales effects, and initial investment And the operation cost is low, the operation is easy, and the fully automated operation can be realized.

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Abstract

An integrated multifunctional flue gas waste heat recovery tower, which is used for the recovery and utilization of waste heat of flue gas from furnaces in cogeneration power plants. The flue gas enters a recovery tower body (3) from a flue gas inlet, passes through a desulfurization spray layer (5), and then flows evenly through a flue gas distributor (7) to a desulfurization spray layer (8). A demister (9) is provided above the desulfurization spray layer (8), and an exhaust port connected to a flue gas pipe extending into a chimney (25) is provided above the demister (9). The waste heat recovery tower is also connected to a plate heat exchanger (30), which reduces the temperature of circulating spray water entering the waste heat recovery tower. The return water from a heating network is heated by the plate heat exchanger (30) and then enters a heating network heater for further heating, and is sent to the heating network upon reaching operation requirements. The present integrated multifunctional flue gas waste heat recovery tower can simultaneously perform denitrification, desulfurization, dust removal, and condensate recovery on flue gas, thereby saving floor space and reducing investment and operation costs.

Description

[根据细则37.2由ISA制定的发明名称]　一体化多功能烟气余热回收塔 [Name of invention developed by ISA according to Rule 37.2] 　Integrated multifunctional flue gas waste heat recovery tower 技术领域Technical field
本发明属于热电厂锅炉烟气余热回收与利用技术领域，特别涉及集脱硫脱硝、除尘和冷凝水回收一体化的高效多功能烟气余热回收塔。The invention belongs to the technical field of recovery and utilization of flue gas waste heat of thermal power plant boilers, and particularly relates to a high-efficiency multifunctional flue gas waste heat recovery tower integrating desulfurization and denitrification, dust removal and condensed water recovery.
背景技术Background technique
近几年国家对节能减排的工作非常重视。如何提高锅炉热效率，充分利用锅炉烟气的余热已经成为研究的热点之一。目前工业燃煤锅炉排烟温度一般不低于180℃，甚至高达250℃，排放的高温烟气浪费了大量的热能，同时也污染了周边的大气环境。若利用烟气余热回收塔对低温烟气喷淋冷凝，可以让烟气和喷淋水直接接触进行热交换，能将锅炉排烟温度降低至露点温度及以下，烟气中的水蒸汽凝结放热，便可回收烟气中的大量潜热量，大大提高锅炉的热效率。若分别设脱销和脱硫设施，存在占地面积很大、投资造价高等问题，因此在国家环保标准越来越严格的今天，超低排放日渐普及的情况下，如何降低烟气中的污染物浓度和粉尘排放量，使得烟气排放符合标准，尽可能降低投资成本及最大化利用烟气余热已成为热电厂考虑的重点问题。In recent years, the country has attached great importance to energy conservation and emission reduction. How to improve the thermal efficiency of the boiler and make full use of the waste heat of the boiler flue gas has become one of the research hotspots. At present, the exhaust gas temperature of industrial coal-fired boilers is generally not lower than 180°C, even as high as 250°C. The high-temperature flue gas discharged wastes a lot of heat energy and also pollutes the surrounding atmospheric environment. If the flue gas waste heat recovery tower is used to spray and condense the low-temperature flue gas, the flue gas and the spray water can be directly contacted for heat exchange, and the boiler exhaust gas temperature can be reduced to the dew point temperature and below, and the water vapor in the flue gas can be condensed and released. Heat can recover a large amount of latent heat in the flue gas, greatly improving the thermal efficiency of the boiler. If there are separate out-of-stock and desulfurization facilities, there will be problems such as large area and high investment cost. Therefore, as the national environmental protection standards are becoming stricter and ultra-low emissions are becoming more and more popular, how to reduce the concentration of pollutants in the flue gas And dust emissions, making the flue gas emissions meet the standards, reducing investment costs as much as possible and maximizing the use of flue gas waste heat have become key issues considered by thermal power plants.
技术问题technical problem
本发明的目的是提供了一种集脱硫脱硝、除尘和冷凝水回收一体化的高效多功能烟气余热回收塔，可以有效脱除烟气中的SO 2、NO X及烟尘等，极大降低了烟气对大气的污染，同时对烟气进行余热回收，降低投资成本。 The purpose of the present invention is to provide a high-efficiency multifunctional flue gas waste heat recovery tower integrating desulfurization, denitrification, dust removal and condensate water recovery, which can effectively remove SO 2 , NO X and smoke dust in the flue gas, greatly reducing It reduces the pollution of the flue gas to the atmosphere, and at the same time recovers the waste heat of the flue gas, reducing investment costs.
技术解决方案Technical solutions
本发明的技术方案：The technical scheme of the present invention:
一种集脱硫脱硝、除尘和冷凝水回收一体化的高效多功能烟气余热回收塔，包括除尘器2、回收塔主体3、脱硝剂输送泵28、脱硝剂溶液罐11、脱硫剂输送泵26、脱硫剂溶液罐12和板式换热器30，其中：An efficient and multifunctional flue gas waste heat recovery tower integrating desulfurization, denitrification, dust removal and condensate water recovery, including a dust collector 2, a recovery tower body 3, a denitrification agent delivery pump 28, a denitrification agent solution tank 11, and a desulfurization agent delivery pump 26 , Desulfurizer solution tank 12 and plate heat exchanger 30, in which:
所述回收塔主体3由下至上依次设置有浆液循环池、烟气入口、填料层4、脱硫喷淋层5、斜挡板10、烟气进口分气器6、烟气分布器7、脱硝喷淋层8、除雾器9和烟气出口，The main body 3 of the recovery tower is provided with a slurry circulation pool, a flue gas inlet, a packing layer 4, a desulfurization spray layer 5, an inclined baffle 10, a flue gas inlet separator 6, a flue gas distributor 7, and a denitration from bottom to top. Spray layer 8, demister 9 and flue gas outlet,
所述烟气入口设置于所述回收塔主体3近底部处，所述除尘器2与所述烟气入口连接，烟气经所述除尘器2除尘后，由所述烟气入口进入所述回收塔主体3内，The flue gas inlet is arranged near the bottom of the recovery tower body 3, and the dust collector 2 is connected to the flue gas inlet. After dust is removed by the dust collector 2, the flue gas enters the flue gas inlet Inside the main body 3 of the recovery tower,
所述填料层4水平设置于所述回收塔主体3内，所述填料层4位于所述烟气入口上方，所述填料层4上方水平设置有脱硫喷淋层5，所述填料层4具有空隙，由所述烟气入口进入的经除尘的烟气与所述脱硫喷淋层5喷淋的脱硫剂在所述填料层4中的填料表面接触，以将经除尘的烟气脱硫，The packing layer 4 is horizontally arranged in the recovery tower body 3, the packing layer 4 is located above the flue gas inlet, and a desulfurization spray layer 5 is horizontally arranged above the packing layer 4, and the packing layer 4 has In the gap, the dust-removed flue gas entering from the flue gas inlet contacts the surface of the filler in the filler layer 4 with the desulfurizing agent sprayed by the desulfurization spray layer 5 to desulfurize the dust-removed flue gas,
所述斜挡板10设置于所述脱硫喷淋层5上方，所述烟气进口分气器6固定于所述斜挡板10上表面，经脱硫的烟气经烟气进口分气器6上流至所述斜挡板10上方，该烟气进口分气器6为气水分离器，由很多挡板构成，流体在烟气进口分气器6内多次改变流动方向，由于悬浮的水滴有较大的质量和惯性，当遇到挡板流动方向改变时，烟气绕过挡板继续向前，而水滴就会积聚在挡板上，最后落到斜挡板10底部，通过疏水阀排出；The inclined baffle 10 is arranged above the desulfurization spray layer 5, the flue gas inlet separator 6 is fixed on the upper surface of the inclined baffle 10, and the desulfurized flue gas passes through the flue gas inlet separator 6 It flows up to above the inclined baffle 10. The flue gas inlet separator 6 is a gas-water separator, which is composed of many baffles. The fluid changes its flow direction many times in the flue gas inlet separator 6 due to the suspended droplets With greater mass and inertia, when the flow direction of the baffle changes, the flue gas bypasses the baffle and continues forward, and the water droplets will accumulate on the baffle, and finally fall to the bottom of the inclined baffle 10, passing through the trap discharge;
所述回收塔主体3内，所述烟气进口分气器6的上方水平设置有烟气分布器7，用以将经脱硫的烟气均匀分布向上流动，In the recovery tower main body 3, a flue gas distributor 7 is horizontally arranged above the flue gas inlet gas distributor 6 to evenly distribute the desulfurized flue gas to flow upwards,
所述脱硝喷淋层8水平设置于所述回收塔主体3内，位于所述烟气分布器7的上方，使用所述脱硝喷淋层8喷淋的脱硝剂对通过所述烟气分布器7向上流动的烟气进行脱硝，所述脱硝喷淋层8喷淋的脱硝剂经所述斜挡板10排放至回收塔主体3外部；The denitrification spray layer 8 is horizontally arranged in the recovery tower body 3, above the flue gas distributor 7, and the denitrification agent sprayed by the denitrification spray layer 8 passes through the flue gas distributor 7 The flue gas flowing upward is denitrified, and the denitrification agent sprayed by the denitrification spray layer 8 is discharged to the outside of the recovery tower body 3 through the inclined baffle 10;
所述除雾器9水平设置于所述回收塔主体3内，位于所述脱硝喷淋层8上方，经脱硝的烟气经过所述除雾器9以去除水雾，并从设置于所述除雾器9上方的所述烟气出口排出，The demister 9 is horizontally arranged in the recovery tower main body 3, above the denitration spray layer 8. The denitrated flue gas passes through the demister 9 to remove water mist, and is removed from the The flue gas outlet above the mist eliminator 9 is discharged,
所述脱硝剂溶液罐11通过脱硝剂输送泵28与所述脱硝喷淋层8连接，以向所述脱硝喷淋层8提供脱硝剂，The denitration agent solution tank 11 is connected to the denitration spray layer 8 through a denitration agent delivery pump 28 to provide the denitration spray layer 8 with a denitration agent,
所述脱硫剂溶液罐12通过脱硫剂输送泵26与回收塔主体3底部的浆液循环池连接，脱硫剂溶液罐12用于提供浆液循环池内的脱硫剂；在余热回收塔3的底部设置循环喷淋水出口，烟气析出的部分冷凝水和脱硫浆液组成循环喷淋水从循环喷淋水出口排出，由余热回收塔循环水泵13驱动返回至塔内所述脱硫喷淋层5进行循环喷洒，The desulfurization agent solution tank 12 is connected to the slurry circulation pool at the bottom of the recovery tower body 3 through the desulfurization agent delivery pump 26, and the desulfurization agent solution tank 12 is used to provide the desulfurization agent in the slurry circulation pool; a circulating spray is provided at the bottom of the waste heat recovery tower 3. At the spray water outlet, part of the condensed water from the flue gas and desulfurization slurry is composed of circulating spray water, which is discharged from the circulating spray water outlet, and is driven by the waste heat recovery tower circulating water pump 13 to return to the desulfurization spray layer 5 in the tower for circulating spraying.
循环喷淋水经过板式换热器30换热冷却后，从板式换热器30喷淋水侧出口流出，返回至塔内所述脱硫喷淋层5进行循环喷洒，After the circulating spray water is cooled by the heat exchange of the plate heat exchanger 30, it flows out from the spray water side outlet of the plate heat exchanger 30 and returns to the desulfurization spray layer 5 in the tower for circulating spraying.
板式换热器30需要定期检修，其喷淋水侧设有多个阀门，实现循环喷淋水直接进入脱硫喷淋层5进行循环喷洒，The plate heat exchanger 30 needs regular maintenance. There are multiple valves on the spray water side to realize that the circulating spray water directly enters the desulfurization spray layer 5 for circulating spraying.
板式换热器30同时将循环喷淋水中的热量传递给热网回水，热网回水再进入热网加热器进一步加热，达到运行要求后送至热网；The plate heat exchanger 30 simultaneously transfers the heat in the circulating spray water to the heating network return water, and the heating network return water enters the heating network heater for further heating, and sends it to the heating network after reaching the operating requirements;
除尘器2出口端管路与烟囱25入口端管路之间设有旁通管路，其上设有烟气旁通管阀门K1，烟气旁通管阀门K1在余热回收塔3出现故障或者检修时开启，高温烟气经除尘器2除尘后通过烟囱25直接排放。A bypass pipeline is provided between the outlet pipe of the dust collector 2 and the inlet pipe of the chimney 25, on which a flue gas bypass pipe valve K1, and the flue gas bypass pipe valve K1 fails in the waste heat recovery tower 3 or It is turned on during maintenance, and the high-temperature flue gas is directly discharged through the chimney 25 after being dedusted by the dust collector 2.
所述脱硝剂输送泵28与所述脱硝剂溶液罐11之间设置有脱硝剂输送阀门29，以控制脱硝剂的泵送；所述脱硫剂输送泵26与所述脱硫剂溶液罐12之间的管路上设置有脱硫剂输送阀门27，以控制脱硫剂的泵送。A denitration agent delivery valve 29 is provided between the denitrification agent delivery pump 28 and the denitrification agent solution tank 11 to control the pumping of the denitration agent; between the desulfurization agent delivery pump 26 and the desulfurization agent solution tank 12 A desulfurizing agent delivery valve 27 is provided on the pipeline to control the pumping of the desulfurizing agent.
所述脱硫剂为50%质量百分比浓度的NaOH溶液；所述脱硝剂为27.5%质量百分比浓度的H 2O 2。 The desulfurizing agent is a NaOH solution with a concentration of 50% by mass; the denitration agent is H 2 O 2 with a concentration of 27.5% by mass.
所述回收塔主体3为一体化铸造成型，所述除雾器9、所述脱硝喷淋层8、所述脱硫喷淋层5、所述烟气分布器7下侧均设置有支撑架，用于将所述除雾器9、所述脱硝喷淋层8、所述脱硫喷淋层5、所述烟气分布器7分别固定于所述回收塔主体3内部。The main body 3 of the recovery tower is integrally cast, and the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 are all provided with a support frame on the lower side, It is used to fix the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 in the recovery tower body 3, respectively.
有益效果Beneficial effect
本发明的有益效果：所述的高效多功能烟气余热回收塔，极大程度上利用了烟气中的热能，实现了节能和环保的有机结合，同时集成化程度高，节省了设备占地面积，大幅度降低了投资，可广泛应用于工业锅炉房、热电厂等脱硫脱硝及烟气余热利用工程中。The beneficial effects of the present invention: the high-efficiency and multifunctional flue gas waste heat recovery tower utilizes the heat energy in the flue gas to a great extent, realizes the organic combination of energy saving and environmental protection, and has a high degree of integration and saves equipment space. The area is greatly reduced, and it can be widely used in industrial boiler houses, thermal power plants, and other desulfurization, denitrification and flue gas waste heat utilization projects.
附图说明Description of the drawings
图1为本发明实施例中的高效多功能烟气余热回收塔的系统图。Figure 1 is a system diagram of an efficient and multifunctional flue gas waste heat recovery tower in an embodiment of the present invention.
图中：1锅炉；2除尘器；3回收塔主体；4填料层；5脱硫喷淋层；6烟气进口分气器；7烟气分布器；8脱硝喷淋层；9除雾器；10斜挡板；11脱硝剂溶液罐；12脱硫剂溶液罐；13脱硫剂循环泵；14~24为阀门；25烟囱；26脱硫剂输送泵；27脱硫剂输送阀门；28脱硝剂输送泵；29脱硝剂输送阀门；30板式换热器；K1余热回收塔入口阀门；K2旁通管阀门。In the picture: 1 boiler; 2 dust collector; 3 recovery tower body; 4 packing layer; 5 desulfurization spray layer; 6 flue gas inlet separator; 7 flue gas distributor; 8 denitration spray layer; 9 demister; 10 Inclined baffle; 11 Denitration agent solution tank; 12 Desulfurization agent solution tank; 13 Desulfurization agent circulation pump; 14~24 for valves; 25 Chimney; 26 Desulfurization agent delivery pump; 27 Desulfurization agent delivery valve; 28 Denitration agent delivery pump; 29 Denitration agent delivery valve; 30 plate heat exchanger; K1 waste heat recovery tower inlet valve; K2 bypass valve.
本发明的实施方式Embodiments of the invention
以下结合附图和技术方案，进一步说明本发明的具体实施方式。The specific embodiments of the present invention will be further described below in conjunction with the drawings and technical solutions.
应当了解，所附附图并非按比例地绘制，而仅是为了说明本发明的基本原理的各种特征的适当简化的画法。本文所公开的本发明的具体设计特征包括例如具体尺寸、方向、位置和外形将部分地由具体所要应用和使用的环境来确定。It should be understood that the accompanying drawings are not drawn to scale, but are merely appropriately simplified drawing methods for illustrating various features of the basic principles of the present invention. The specific design features of the present invention disclosed herein, including, for example, specific dimensions, directions, positions, and shapes will be partially determined by the specific application and use environment.
在所附多个附图中，同样的或等同的部件(元素)以相同的附图标记标引。In the accompanying drawings, the same or equivalent parts (elements) are denoted by the same reference signs.
应当了解，在本说明书中提及的术语“连接”不仅表示部件之间的直接连接，也表示部件之间通过管路等其他元件进行连接。It should be understood that the term "connection" mentioned in this specification not only refers to a direct connection between components, but also refers to a connection between components through other elements such as pipelines.
图1为本发明实施例中的高效多功能烟气余热回收塔的系统图。如图1所示，本实施例中，提供了一种高效多功能烟气余热回收塔，包括除尘器2、回收塔主体3、脱硝剂输送泵28、脱硝剂溶液罐11、脱硫剂输送泵26、脱硫剂溶液罐12和板式换热器30。Figure 1 is a system diagram of an efficient and multifunctional flue gas waste heat recovery tower in an embodiment of the present invention. As shown in Figure 1, in this embodiment, a high-efficiency and multifunctional flue gas waste heat recovery tower is provided, which includes a dust collector 2, a recovery tower body 3, a denitrification agent delivery pump 28, a denitrification agent solution tank 11, and a desulfurization agent delivery pump 26. Desulfurizer solution tank 12 and plate heat exchanger 30.
回收塔主体3由下至上依次设置有浆液循环池、烟气入口、填料层4、脱硫喷淋层5、斜挡板10、烟气进口分气器6、烟气分布器7、脱硝喷淋层8、除雾器9和烟气出口。The main body 3 of the recovery tower is provided with a slurry circulation pool, a flue gas inlet, a packing layer 4, a desulfurization spray layer 5, an oblique baffle 10, a flue gas inlet separator 6, a flue gas distributor 7, and a denitration spray from bottom to top. Layer 8, demister 9 and flue gas outlet.
如图1所示，由锅炉1产生的烟气在引风机作用下经过除尘器2，经除尘的烟气通过烟气管道经过余热回收塔入口阀门K1与回收塔主体3的烟气入口相连。此外，除尘器2出来的烟气管道通过烟气旁通管道经过旁通管阀门K2与进入烟囱25的管道相连。As shown in Figure 1, the flue gas produced by the boiler 1 passes through the dust collector 2 under the action of the induced draft fan, and the dust-removed flue gas is connected to the flue gas inlet of the recovery tower body 3 through the waste heat recovery tower inlet valve K1 through the flue gas pipeline. In addition, the flue gas pipe from the dust collector 2 is connected to the pipe entering the chimney 25 through the bypass pipe valve K2 through the flue gas bypass pipe.
烟气入口设置于回收塔主体3近底部处，除尘器2与烟气入口连接，烟气经除尘器2除尘后，由烟气入口进入回收塔主体3内。The flue gas inlet is arranged near the bottom of the recovery tower main body 3, and the dust collector 2 is connected with the flue gas inlet. After dust is removed by the dust collector 2, the flue gas enters the recovery tower main body 3 from the flue gas inlet.
填料层4水平设置于回收塔主体3内，填料层4位于烟气入口上方，填料层4上方水平设置有脱硫喷淋层5，填料层4具有空隙，由烟气入口进入的经除尘的烟气与脱硫喷淋层5喷淋的脱硫剂在填料层4中的填料表面接触，以将经除尘的烟气脱硫。The packing layer 4 is horizontally arranged in the main body 3 of the recovery tower, the packing layer 4 is located above the flue gas inlet, and the desulfurization spray layer 5 is horizontally arranged above the packing layer 4. The packing layer 4 has gaps, and the dedusted smoke entering from the flue gas inlet The desulfurization agent sprayed by the gas and the desulfurization spray layer 5 contacts the surface of the filler in the filler layer 4 to desulfurize the dust-removed flue gas.
斜挡板10设置于脱硫喷淋层5上方，烟气进口分气器6固定于斜挡板10上表面，经脱硫的烟气经烟气进口分气器6上流至斜挡板10上方。斜挡板10的设置便于外排脱硝喷淋液，并经过处理之后重新利用。在一个具体的实施方案中，斜挡板10与水平面的夹角为6°。The inclined baffle 10 is arranged above the desulfurization spray layer 5, and the flue gas inlet distributor 6 is fixed on the upper surface of the inclined baffle 10, and the desulfurized flue gas flows upward through the flue gas inlet distributor 6 to above the inclined baffle 10. The setting of the inclined baffle 10 is convenient for draining the denitration spray liquid outside and reusing it after treatment. In a specific embodiment, the angle between the inclined baffle 10 and the horizontal plane is 6°.
斜挡板10设置于所述脱硫喷淋层5上方，烟气进口分气器6固定于斜挡板10上表面，经脱硫的烟气经烟气进口分气器6上流至斜挡板10上方，该烟气进口分气器6为气水分离器，由很多挡板构成，流体在烟气进口分气器6内多次改变流动方向，由于悬浮的水滴有较大的质量和惯性，当遇到挡板流动方向改变时，烟气绕过挡板继续向前，而水滴就会积聚在挡板上，最后落到斜挡板10底部，通过疏水阀排出； The oblique baffle 10 is arranged above the desulfurization spray layer 5, the flue gas inlet separator 6 is fixed on the upper surface of the oblique baffle 10, and the desulfurized flue gas flows up to the oblique baffle 10 through the flue gas inlet separator 6 Above, the flue gas inlet separator 6 is a gas-water separator, which is composed of many baffles. The fluid changes its flow direction many times in the flue gas inlet separator 6. Because the suspended water droplets have greater mass and inertia, When the flow direction of the baffle changes, the flue gas bypasses the baffle and continues to move forward, and the water droplets will accumulate on the baffle, and finally fall to the bottom of the inclined baffle 10 and be discharged through the trap;
回收塔主体3内，烟气进口分气器6的上方水平设置有烟气分布器7，用以将经脱硫的烟气均匀分布向上流动。In the main body 3 of the recovery tower, a flue gas distributor 7 is horizontally arranged above the flue gas inlet separator 6 to evenly distribute the desulfurized flue gas to flow upward.
脱硝喷淋层8水平设置于回收塔主体3内，位于烟气分布器7的上方，使用脱硝喷淋层8喷淋的脱硝剂对通过烟气分布器7向上流动的烟气进行脱硝，脱硝喷淋层8喷淋的脱硝剂经斜挡板10排放至回收塔主体3外部。The denitrification spray layer 8 is horizontally arranged in the main body 3 of the recovery tower, above the flue gas distributor 7, and the denitrification agent sprayed by the denitrification spray layer 8 is used to denitrate the flue gas flowing upward through the flue gas distributor 7. The denitration agent sprayed by the spray layer 8 is discharged to the outside of the recovery tower body 3 through the inclined baffle 10.
除雾器9水平设置于回收塔主体3内，位于脱硝喷淋层8上方，经脱硝的烟气经过除雾器9以去除水雾，并从设置于除雾器9上方的烟气出口排出。在具体的实施方案中，如图1所示，烟气出口连接烟囱25，烟气经烟囱25排出。具体地，烟气中的含硫和含氮量达到国家的排放标准然后被排放到大气中。The demister 9 is horizontally arranged in the recovery tower body 3, above the denitration spray layer 8. The denitrated flue gas passes through the demister 9 to remove water mist, and is discharged from the flue gas outlet arranged above the demister 9 . In a specific embodiment, as shown in FIG. 1, the flue gas outlet is connected to the chimney 25, and the flue gas is discharged through the chimney 25. Specifically, the sulfur and nitrogen content in the flue gas meets national emission standards and then is discharged into the atmosphere.
脱硝剂溶液罐11通过脱硝剂输送泵28与脱硝喷淋层8连接，以向脱硝喷淋层8提供脱硝剂。在一个具体的实施方案中，脱硝剂输送泵28与脱硝剂溶液罐11之间设置有脱硝剂输送阀门29，以控制脱硝剂的泵送。The denitration agent solution tank 11 is connected to the denitration spray layer 8 through a denitration agent delivery pump 28 to provide a denitration agent to the denitration spray layer 8. In a specific embodiment, a denitration agent delivery valve 29 is provided between the denitration agent delivery pump 28 and the denitration agent solution tank 11 to control the pumping of the denitration agent.
脱硫剂溶液罐12通过脱硫剂输送泵26与回收塔主体3底部的浆液循环池连接，脱硫剂溶液罐12用于提供浆液循环池内的脱硫剂；在余热回收塔3的底部设置循环喷淋水出口，烟气析出的部分冷凝水和脱硫浆液组成循环喷淋水从循环喷淋水出口排出，由余热回收塔循环水泵13驱动返回至塔内所述脱硫喷淋层5进行循环喷洒。在具体的实施方案中，脱硫剂输送泵26与脱硫剂溶液罐12之间的管路上，设置有脱硫剂输送阀门27，以控制脱硫剂的泵送。The desulfurization agent solution tank 12 is connected to the slurry circulation pool at the bottom of the recovery tower body 3 through the desulfurization agent delivery pump 26. The desulfurization agent solution tank 12 is used to provide the desulfurization agent in the slurry circulation pool; the bottom of the waste heat recovery tower 3 is provided with circulating spray water At the outlet, part of the condensed water precipitated by the flue gas and the desulfurization slurry constituted circulating spray water is discharged from the circulating spray water outlet, and is driven by the waste heat recovery tower circulating water pump 13 to return to the desulfurization spray layer 5 in the tower for cyclic spraying. In a specific embodiment, the pipeline between the desulfurizer delivery pump 26 and the desulfurizer solution tank 12 is provided with a desulfurizer delivery valve 27 to control the pumping of the desulfurizer.
在一个具体的实施方案中，脱硫剂为质量百分含量50%的NaOH溶液。脱硝剂为质量百分含量27.5%的H 2O 2，脱硝效率高，价格相对低廉，且无二次污染。 In a specific embodiment, the desulfurizing agent is a NaOH solution with a mass percentage of 50%. The denitration agent is H 2 O 2 with a mass percentage of 27.5%, which has high denitration efficiency, relatively low price, and no secondary pollution.
在一个具体的实施方案中，所述回收塔主体3为一体化铸造成型，所述除雾器9、脱硝喷淋层8、脱硫喷淋层5、烟气分布器7下侧均设置有支撑架，用于将除雾器9、脱硝喷淋层8、脱硫喷淋层5、烟气分布器7分别固定于回收塔主体3内部。In a specific embodiment, the recovery tower body 3 is integrally cast and molded, and the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 are all provided with supports on the lower side The rack is used to fix the demister 9, the denitration spray layer 8, the desulfurization spray layer 5, and the flue gas distributor 7 in the recovery tower body 3, respectively.
循环喷淋水由水泵驱动，在板式换热器30和余热回收塔3间循环运行。余热回收塔3上部设置喷淋循环水入口，下部设置喷淋循环水出口，在出口处与板式换热器30的热媒进口相连接，板式换热器30的热媒出口通过喷淋管道、阀门与喷淋循环水的入口相连接，从而形成闭合环路。The circulating spray water is driven by a water pump and circulates between the plate heat exchanger 30 and the waste heat recovery tower 3. The upper part of the waste heat recovery tower 3 is provided with a spray circulating water inlet, and the lower part is provided with a spray circulating water outlet. The outlet is connected with the heat medium inlet of the plate heat exchanger 30. The heat medium outlet of the plate heat exchanger 30 passes through the spray pipe, The valve is connected to the inlet of the spray circulating water, thus forming a closed loop.
循环喷淋水经过板式换热器30换热冷却后，依次经过阀门、脱硫剂循环泵13、多个阀门控制进入至板式换热器30喷淋水侧，换热后从板式换热器30喷淋水侧出口流出，经过多个阀门控制返回至塔内所述脱硫喷淋层5进行循环喷洒。板式换热器30检修时，其喷淋水侧入口管路和出口管路上的阀门关闭，开启入口管路和出口管路之间的阀门，实现循环喷淋水直接进入脱硫喷淋层5进行循环喷洒。After the circulating spray water is cooled by the heat exchange of the plate heat exchanger 30, it passes through the valve, the desulfurizer circulating pump 13, and multiple valves to enter the spray water side of the plate heat exchanger 30. After the heat exchange, it flows from the plate heat exchanger 30. The spray water side outlet flows out, and is controlled by multiple valves to return to the desulfurization spray layer 5 in the tower for cyclic spraying. When the plate heat exchanger 30 is overhauled, the valves on the inlet pipe and outlet pipe of the spray water side are closed, and the valve between the inlet pipe and the outlet pipe is opened, so that the circulating spray water directly enters the desulfurization spray layer 5 for processing. Spray cyclically.
板式换热器30同时将循环喷淋水中的热量传递给热网回水，热网回水再进入热网加热器进一步加热，达到运行要求后送至热网。The plate heat exchanger 30 simultaneously transfers the heat in the circulating spray water to the heating network return water, and the heating network return water enters the heating network heater for further heating, and sends it to the heating network after meeting the operating requirements.
利用板式换热器30环喷淋水冷却，同时将加热热网的回水，热网回水经过板换加热后进入热网加热器进一步加热，达到运行要求后送至热网。The plate heat exchanger 30 is used for cooling by spraying water, and at the same time, the return water of the heating heating network, the return water of the heating network is heated by the plate exchange, and then enters the heating network heater for further heating, and then is sent to the heating network after reaching the operating requirements.
由上述说明，本系统具体实施步骤为：1.进行基本的设备检查，特别检查换热器是否有堵塞、管道是否存在跑冒滴漏等现象。2.开启余热回收塔循环水泵，喷淋水在板式换热器和余热回收塔之间形成循环。3.把烟气引入至余热回收塔，烟气余热回收过程开始。From the above description, the specific implementation steps of this system are as follows: 1. Perform basic equipment inspections, especially check whether the heat exchanger is blocked, and the pipeline is leaking. 2. Turn on the waste heat recovery tower circulating water pump, and the spray water will circulate between the plate heat exchanger and the waste heat recovery tower. 3. The flue gas is introduced into the waste heat recovery tower, and the process of flue gas waste heat recovery starts.
本发明提供的集脱硫、脱硝、除尘和冷凝水回收一体化的高效多功能烟气余热回收塔操作温度为38~100℃，操作温度范围更广，脱硫及脱硝效率稳定，达到《火电厂大气污染物排放标准》及《大气污染物综合排放标准》中对相关污染物的排放要求。本发明提供的烟气余热回收塔可以同时实现脱硫、脱销、进一步降尘、余热回收和冷凝水回收等多种功能，可减少污染物的排放，占地面积小，脱硫及脱销效果好，初投资及运行费用较低操作容易，可实现全自动化的操作。The operating temperature of the high-efficiency multifunctional flue gas waste heat recovery tower integrating desulfurization, denitrification, dust removal and condensed water recovery provided by the present invention is 38~100°C, the operating temperature range is wider, and the desulfurization and denitrification efficiency is stable, reaching The emission requirements of related pollutants in the Pollutant Emission Standard and the Comprehensive Air Pollutant Emission Standard. The flue gas waste heat recovery tower provided by the present invention can simultaneously realize multiple functions such as desulfurization, de-sales, further dust reduction, waste heat recovery, and condensed water recovery, etc., can reduce pollutant discharge, has a small floor area, has good desulfurization and de-sales effects, and initial investment And the operation cost is low, the operation is easy, and the fully automated operation can be realized.
以上所述仅是本发明的优选实施方式，并不用于限制本发明，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变型，这些改进和变型也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements can be made without departing from the technical principles of the present invention. And modifications, these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (5)

  1. 一种集脱硫脱硝、除尘和冷凝水回收一体化的高效多功能烟气余热回收塔，其特征在于，所述多功能烟气余热回收塔包括除尘器（2）、回收塔主体（3）、脱硝剂输送泵（28）、脱硝剂溶液罐（11）、脱硫剂输送泵（26）、脱硫剂溶液罐（12）和板式换热器（30），其中：A high-efficiency multifunctional flue gas waste heat recovery tower integrating desulfurization, denitrification, dust removal and condensate water recovery is characterized in that the multifunctional flue gas waste heat recovery tower includes a dust collector (2), a recovery tower main body (3), Denitrification agent delivery pump (28), denitrification agent solution tank (11), desulfurization agent delivery pump (26), desulfurization agent solution tank (12) and plate heat exchanger (30), of which:
    所述回收塔主体（3）由下至上依次设置有浆液循环池、烟气入口、填料层（4）、脱硫喷淋层（5）、斜挡板（10）、烟气进口分气器（6）、烟气分布器（7）、脱硝喷淋层（8）、除雾器（9）和烟气出口，The main body (3) of the recovery tower is provided with a slurry circulation pool, a flue gas inlet, a packing layer (4), a desulfurization spray layer (5), an inclined baffle (10), and a flue gas inlet separator ( 6), flue gas distributor (7), denitration spray layer (8), demister (9) and flue gas outlet,
    所述烟气入口设置于所述回收塔主体（3）近底部处，所述除尘器（2）与所述烟气入口连接，烟气经所述除尘器（2）除尘后，由所述烟气入口进入所述回收塔主体（3）内，The flue gas inlet is arranged near the bottom of the recovery tower main body (3), the dust collector (2) is connected to the flue gas inlet, and the flue gas is dust-removed by the dust collector (2) and then The flue gas inlet enters the main body (3) of the recovery tower,
    所述填料层（4）水平设置于所述回收塔主体（3）内，所述填料层（4）位于所述烟气入口上方，所述填料层（4）上方水平设置有脱硫喷淋层（5），所述填料层（4）具有空隙，由所述烟气入口进入的经除尘的烟气与所述脱硫喷淋层（5）喷淋的脱硫剂在所述填料层（4）中的填料表面接触，以将经除尘的烟气脱硫，The packing layer (4) is horizontally arranged in the recovery tower body (3), the packing layer (4) is located above the flue gas inlet, and a desulfurization spray layer is horizontally arranged above the packing layer (4) (5) The packing layer (4) has a gap, and the dusted flue gas entering from the flue gas inlet and the desulfurizing agent sprayed by the desulfurization spray layer (5) are in the packing layer (4) The surface of the filler in the slab to desulfurize the dedusted flue gas,
    所述斜挡板（10）设置于所述脱硫喷淋层（5）上方，所述烟气进口分气器（6）固定于所述斜挡板（10）上表面，经脱硫的烟气经烟气进口分气器（6）上流至所述斜挡板（10）上方，该烟气进口分气器（6）为气水分离器，由很多挡板构成，流体在烟气进口分气器（6）内多次改变流动方向，由于悬浮的水滴有较大的质量和惯性，当遇到挡板流动方向改变时，烟气绕过挡板继续向前，而水滴就会积聚在挡板上，最后落到斜挡板（10）底部，通过疏水阀排出；The inclined baffle (10) is arranged above the desulfurization spray layer (5), and the flue gas inlet distributor (6) is fixed on the upper surface of the inclined baffle (10). The flue gas after desulfurization The flue gas inlet divider (6) flows up to the top of the inclined baffle (10). The flue gas inlet divider (6) is a gas-water separator composed of many baffles, and the fluid is distributed at the flue gas inlet. The flow direction in the aerator (6) is changed many times. Because the suspended water droplets have larger mass and inertia, when the flow direction of the baffle changes, the flue gas bypasses the baffle and continues forward, and the water droplets will accumulate in On the baffle, it finally falls to the bottom of the inclined baffle (10) and is discharged through the trap;
    所述回收塔主体（3）内，所述烟气进口分气器（6）的上方水平设置有烟气分布器（7），用以将经脱硫的烟气均匀分布向上流动，In the recovery tower main body (3), a flue gas distributor (7) is horizontally arranged above the flue gas inlet separator (6) to evenly distribute the desulfurized flue gas to flow upwards,
    所述脱硝喷淋层（8）水平设置于所述回收塔主体（3）内，位于所述烟气分布器（7）的上方，使用所述脱硝喷淋层（8）喷淋的脱硝剂对通过所述烟气分布器（7）向上流动的烟气进行脱硝，所述脱硝喷淋层（8）喷淋的脱硝剂经所述斜挡板（10）排放至回收塔主体（3）外部；The denitration spray layer (8) is horizontally arranged in the recovery tower main body (3), located above the flue gas distributor (7), and the denitrification agent sprayed by the denitration spray layer (8) is used The flue gas flowing upward through the flue gas distributor (7) is denitrated, and the denitrification agent sprayed by the denitration spray layer (8) is discharged to the recovery tower main body (3) through the inclined baffle (10) external;
    所述除雾器（9）水平设置于所述回收塔主体（3）内，位于所述脱硝喷淋层（8）上方，经脱硝的烟气经过所述除雾器（9）以去除水雾，并从设置于所述除雾器（9）上方的所述烟气出口排出，The demister (9) is horizontally arranged in the recovery tower body (3), above the denitration spray layer (8), and the denitrated flue gas passes through the demister (9) to remove water Mist and discharged from the flue gas outlet provided above the demister (9),
    所述脱硝剂溶液罐（11）通过脱硝剂输送泵（28）与所述脱硝喷淋层（8）连接，以向所述脱硝喷淋层（8）提供脱硝剂，The denitration agent solution tank (11) is connected to the denitration spray layer (8) through a denitration agent delivery pump (28) to provide a denitration agent to the denitration spray layer (8),
    所述脱硫剂溶液罐（12）通过脱硫剂输送泵（26）与回收塔主体（3）底部的浆液循环池连接，脱硫剂溶液罐（12）用于提供浆液循环池内的脱硫剂；在余热回收塔（3）的底部设置循环喷淋水出口，烟气析出的部分冷凝水和脱硫浆液组成循环喷淋水从循环喷淋水出口排出，由余热回收塔循环水泵（13）驱动返回至塔内所述脱硫喷淋层（5）进行循环喷洒，The desulfurization agent solution tank (12) is connected to the slurry circulation pool at the bottom of the recovery tower body (3) through a desulfurization agent delivery pump (26), and the desulfurization agent solution tank (12) is used to provide the desulfurization agent in the slurry circulation pool; The bottom of the recovery tower (3) is provided with a circulating spray water outlet. Part of the condensate and desulfurization slurry formed by the flue gas is discharged from the circulating spray water outlet and returned to the tower by the waste heat recovery tower circulating water pump (13). The desulfurization spray layer (5) is sprayed cyclically,
    循环喷淋水经过板式换热器（30）换热冷却后，从板式换热器（30）喷淋水侧出口流出，返回至塔内所述脱硫喷淋层（5）进行循环喷洒，After the circulating spray water passes through the heat exchange and cooling of the plate heat exchanger (30), it flows out from the spray water side outlet of the plate heat exchanger (30) and returns to the desulfurization spray layer (5) in the tower for circulating spraying.
    板式换热器（30）需要定期检修，其喷淋水侧设有多个阀门，实现循环喷淋水直接进入脱硫喷淋层（5）进行循环喷洒，The plate heat exchanger (30) needs regular maintenance. There are multiple valves on the spray water side to realize the circulating spray water directly enters the desulfurization spray layer (5) for circulating spraying.
    板式换热器（30）同时将循环喷淋水中的热量传递给热网回水，热网回水再进入热网加热器进一步加热，达到运行要求后送至热网；The plate heat exchanger (30) simultaneously transfers the heat in the circulating spray water to the heating network return water, and the heating network return water enters the heating network heater for further heating, and sends it to the heating network after reaching the operating requirements;
    除尘器（2）出口端管路与烟囱（25）入口端管路之间设有旁通管路，其上设有烟气旁通管阀门（K1），烟气旁通管阀门（K1）在余热回收塔（3）出现故障或者检修时开启，高温烟气经除尘器（2）除尘后通过烟囱（25）直接排放。A bypass pipeline is provided between the outlet pipe of the dust collector (2) and the inlet pipe of the chimney (25), and a flue gas bypass valve (K1) and flue gas bypass valve (K1) are provided on it When the waste heat recovery tower (3) fails or is opened for maintenance, the high-temperature flue gas is directly discharged through the chimney (25) after being dedusted by the dust collector (2).
  2. 根据权利要求1所述的高效多功能烟气余热回收塔，其特征在于，所述脱硝剂输送泵（28）与所述脱硝剂溶液罐（11）之间设置有脱硝剂输送阀门（29），以控制脱硝剂的泵送；所述脱硫剂输送泵（26）与所述脱硫剂溶液罐（12）之间的管路上设置有脱硫剂输送阀门（27），以控制脱硫剂的泵送。The high-efficiency multifunctional flue gas waste heat recovery tower according to claim 1, wherein a denitrification agent delivery valve (29) is provided between the denitrification agent delivery pump (28) and the denitrification agent solution tank (11) , To control the pumping of denitrification agent; the pipeline between the desulfurization agent delivery pump (26) and the desulfurization agent solution tank (12) is provided with a desulfurization agent delivery valve (27) to control the pumping of desulfurization agent .
  3. 根据权利要求1或2所述的高效多功能烟气余热回收塔，其特征在于，所述脱硫剂为50%质量百分比浓度的NaOH溶液；所述脱硝剂为27.5%质量百分比浓度的H 2O 2。 The high-efficiency and multifunctional flue gas waste heat recovery tower according to claim 1 or 2, wherein the desulfurizing agent is a NaOH solution with a concentration of 50% by mass; the denitrification agent is H 2 O with a concentration of 27.5% by mass. 2 .
  4. 根据权利要求1或2所述的高效多功能烟气余热回收塔，其特征在于，所述回收塔主体（3）为一体化铸造成型，所述除雾器（9）、所述脱硝喷淋层（8）、所述脱硫喷淋层（5）、所述烟气分布器（7）下侧均设置有支撑架，用于将所述除雾器（9）、所述脱硝喷淋层（8）、所述脱硫喷淋层（5）、所述烟气分布器（7）分别固定于所述回收塔主体（3）内部。The high-efficiency and multifunctional flue gas waste heat recovery tower according to claim 1 or 2, characterized in that the main body (3) of the recovery tower is integrally cast, and the demister (9) and the denitration spray The lower side of the layer (8), the desulfurization spray layer (5), and the flue gas distributor (7) are all provided with a support frame for connecting the demister (9) and the denitration spray layer (8) The desulfurization spray layer (5) and the flue gas distributor (7) are respectively fixed inside the recovery tower main body (3).
  5. 根据权利要求3所述的高效多功能烟气余热回收塔，其特征在于，所述回收塔主体（3）为一体化铸造成型，所述除雾器（9）、所述脱硝喷淋层（8）、所述脱硫喷淋层（5）、所述烟气分布器（7）下侧均设置有支撑架，用于将所述除雾器（9）、所述脱硝喷淋层（8）、所述脱硫喷淋层（5）、所述烟气分布器（7）分别固定于所述回收塔主体（3）内部。The high-efficiency and multifunctional flue gas waste heat recovery tower according to claim 3, characterized in that the main body (3) of the recovery tower is integrally cast, and the demister (9) and the denitration spray layer ( 8). The desulfurization spray layer (5) and the lower side of the flue gas distributor (7) are all provided with a support frame for connecting the demister (9), the denitration spray layer (8) ), the desulfurization spray layer (5) and the flue gas distributor (7) are respectively fixed inside the recovery tower main body (3).
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CN206853296U (en) * 2017-05-11 2018-01-09 深圳市卓益节能环保设备有限公司 A kind of water separator
CN107983133A (en) * 2017-12-26 2018-05-04 上海亨远船舶设备有限公司 A kind of system and method for flue gas wet type combined desulfurization and denitration
CN108295634A (en) * 2018-04-11 2018-07-20 江苏垦乐节能环保科技有限公司 A kind of sintering flue gas high-efficiency desulfurization denitrating system and its implementation

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