WO2023005577A1 - Flushing water recirculation system and method for mist eliminator - Google Patents

Flushing water recirculation system and method for mist eliminator Download PDF

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Publication number
WO2023005577A1
WO2023005577A1 PCT/CN2022/102269 CN2022102269W WO2023005577A1 WO 2023005577 A1 WO2023005577 A1 WO 2023005577A1 CN 2022102269 W CN2022102269 W CN 2022102269W WO 2023005577 A1 WO2023005577 A1 WO 2023005577A1
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Prior art keywords
water
water tank
demister
flushing
tank
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PCT/CN2022/102269
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French (fr)
Chinese (zh)
Inventor
王少亮
何胜
石伟栋
雷鸣
牛拥军
陈常青
胡俊
余福胜
石振晶
杨博
王彪
王定帮
郭浩然
薛国栋
武吉福
赵彩虹
李斌
张晨
Original Assignee
西安西热锅炉环保工程有限公司
华能秦煤瑞金发电有限责任公司
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Publication of WO2023005577A1 publication Critical patent/WO2023005577A1/en

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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
    • B01D53/14—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 by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
    • 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
    • B01D53/14—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 by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1481—Removing sulfur dioxide or sulfur trioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/30—Relating to industrial water supply, e.g. used for cooling

Definitions

  • the invention belongs to the technical field of water saving, and relates to a system and method for recycling flushing water of a mist eliminator.
  • Desulfurization absorption towers are generally equipped with high-efficiency roof-mounted demisters.
  • Such situations occur frequently, seriously threatening the safe operation of the unit. Therefore, it is necessary to develop the flushing water recycling technology of the demister in the absorption tower, increase the flushing frequency of the demister, and even flush continuously, so as to completely solve the water balance problem of the desulfurization system, so that the demister can operate efficiently and stably, and at the same time realize the water consumption of the unit.
  • the purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a system and method for recycling flushing water of the demister, which can realize the recycling of the flushing water of the demister in the absorption tower and reduce water consumption.
  • the demister flushing water recycling system of the present invention includes a demister flushing water tank, a clarified water tank, a reuse water tank, a demister flushing water collection tank, a collection tank drainage pipe, a reuse water pump and a demister flushing water pipe;
  • the outlet of the demister rinsing water tank is connected with the inlet of the demister rinsing water pump, the outlet of the reuse water tank is connected with the inlet of the recycle water pump, and the outlet of the recycle water pump and the outlet of the demister rinsing water pump are connected through pipelines It is connected with one end of the flushing water valve of the clarified water tank and the flushing water pipe of the demister, and the other end of the flushing water valve of the clarified water tank is connected with the clarified water tank.
  • the outlet at the bottom of the water collecting tank of the fogger is connected to one end of the drain pipe of the collecting tank, and the other end of the drain pipe of the collecting tank is inserted into the clarified water tank;
  • the top of the clarification water tank is provided with a cofferdam overflow tank of the clarification water tank, and the outlet of the cofferdam overflow tank of the clarification water tank is connected with the reuse water tank.
  • the outlet of the reclaimed water pump is provided with a reclaimed water shut-off valve.
  • the outlet of the demister flushing water pump is provided with a demister flushing water shut-off valve.
  • the bottom outlet of the clarification water tank is divided into two paths, one of which is connected with the bottom flow pump of the clarification water tank, and the other is connected with the drainage pit of the desulfurization island.
  • An inlet valve of the underflow pump of the clarified water tank is arranged between the bottom outlet of the clarified water tank and the underflow pump of the clarified water tank.
  • a vent valve for the clarified water tank is set between the bottom outlet of the clarified water tank and the drainage pit of the desulfurization island.
  • the recycled water tank is provided with a recycled water tank agitator and a recycled water tank liquid level gauge.
  • the outlet of the overflow tank of the cofferdam of the clarified water tank is connected with the reuse water tank through the overflow water pipe.
  • a method for recycling flushing water of a desulfurization absorption tower demister comprising the following steps:
  • the flushing water After flushing the mist eliminator, the flushing water passes through the gap between the inclined blades of the mist eliminator, guides it to the flushing water collection tank of the mist eliminator, and flows into the clarification water tank by itself;
  • the demister flushing water recycling system and method of the present invention When the demister flushing water recycling system and method of the present invention are operated specifically, water is injected into the clarified water tank through the demister flushing water pump until the liquid level in the clarified water tank is higher than the design liquid level, and then the clarified water tank is used to The demister is flushed, wherein, the demister flushing water is collected through the demister flushing water collection tank to the clarified water tank, and the clarified water is circulated to flush the demister, so as to realize the purpose of recycling the demister flushing water and solve the problem of the unit
  • the problem of water balance in the desulfurization system reduces water consumption.
  • Fig. 1 is a system diagram of the present invention
  • Fig. 2 is the structural schematic diagram of the arrangement of the flushing water collection tank 4 of the mist eliminator in embodiment 1;
  • FIG. 3 is a schematic structural diagram of the arrangement of the flushing water collection tank 4 of the demister in Embodiment 2.
  • FIG. 3 is a schematic structural diagram of the arrangement of the flushing water collection tank 4 of the demister in Embodiment 2.
  • 1- Demister flushing water tank 2- Clarifying water tank, 3- Reuse water tank, 4- Demister flushing water collection tank, 5- Collection tank drain, 6- Demister flushing water pump, 7- Demisting Rinse water shut-off valve, 8-clarifying water tank flushing water valve, 9-clarifying water tank cofferdam overflow tank, 10-clarifying water tank underflow pump, 11-clarifying water tank underflow pump inlet valve, 12-clarifying water tank emptying valve, 13- Drainage pit of desulfurization island, 14-overflow pipe, 15-return water tank agitator, 16-return water tank level gauge, 17-return water pump, 18-return water shut-off valve, 19-demister support beam, 20-mist eliminator, 21-mist eliminator flushing water pipe.
  • the demister flushing water recycling system of the present invention includes a demister flushing water tank 1, a clarified water tank 2, a reuse water tank 3, a demister flushing water collection tank 4 and a collection tank drain pipe 5;
  • the outlet of the demister flushing water tank 1 is connected with the inlet of the demister flushing water pump 6, the outlet of the reuse water tank 3 is connected with the inlet of the reuse water pump 17, and the outlet of the reuse water pump 17 is connected with the inlet of the demister flush water pump 6.
  • the outlet is connected with one end of the flushing water valve 8 of the clarified water tank and the flushing water pipe 21 of the demister after being piped together.
  • the demister flushing water shut-off valve 7 is provided, the other end of the clarified water tank flushing water valve 8 is connected with the clarified water tank 2, and the top opening of the demister flushing water collection tank 4 faces the lower end of the demister 20, and the demister
  • the outlet at the bottom of the flushing water collection tank 4 is connected to one end of the collection tank drain pipe 5, and the other end of the collection tank drain pipe 5 is inserted into the clarified water tank 2;
  • the top of the clarified water tank 2 is provided with a clarified water tank cofferdam overflow tank 9 , and the outlet of the clarified water tank cofferdam overflow tank 9 communicates with the reuse water tank 3 through an overflow water pipe 14 .
  • the outlet at the bottom of the clarified water tank 2 is divided into two paths, one of which is connected to the underflow pump 10 of the clarified water tank through the inlet valve 11 of the underflow pump of the clarified water tank, and the other is connected to the drainage pit 13 of the desulfurization island through the vent valve 12 of the clarified water tank.
  • the recycled water tank 3 is provided with a recycled water tank agitator 15 and a recycled water tank liquid level gauge 16 .
  • the desulfurization absorption tower mist eliminator flushing water recycling method of the present invention comprises the following steps:
  • shut-off valve 18 Before starting the system, close the shut-off valve 18 for reused water, open the shut-off valve 7 for flushing water of the demister, close the inlet valve 11 of the underflow pump of the clarified water tank and the vent valve 12 of the clarified water tank.
  • the flushing water passes through the gap between the inclined blades of the demister 20, and then flows into the demister flushing water collection tank 4, and flows into the clarified water tank 2 through the collection tank drainage pipe 5, and the collection tank drains
  • the pipe 5 is inserted below the liquid level of the clarified water tank 2, which can act as a water seal and prevent the flue gas in the absorption tower from escaping to the clarified water tank 2;
  • demister 20 is flushed with recycled water in an intermittent flushing manner or in a continuous flushing manner.
  • the first layer of mist eliminators 20 and the third layer of mist eliminators 20 are roof-like structures, and are arranged on the support beam 19 of the bottom layer of mist eliminators, and the second layer of mist eliminators 20 are all inverted roof-ridge structures.
  • the third layer of demister 20 is arranged on the upper support beam 19 of the demister;
  • the three-layer mist eliminators 20 are all roof-ridge structures, and are respectively arranged on the three-layer mist eliminator support beams 19 ;
  • Main features of the present invention are:
  • the present invention utilizes the demister flushing water collection tank 4 to collect the demister 20 flushing water to the clarified water tank 2, the clarified clear water circulates to flush the demister 20, and the turbid water at the bottom of the clarified water tank 2 flushes the desulfurization system pipeline, pump or discharges to
  • the desulfurization island drainage pit 13 achieves the purpose of recycling the flushing water of the demister 20 in the simplest and feasible way, solves the problem of water balance in the desulfurization system of most units, and obtains the following effects at the same time:
  • the present invention can increase the frequency of flushing the mist eliminator 20, reduce the clogging risk of the mist eliminator 20, and reduce the overall water consumption of the desulfurization system.
  • the present invention completely solves the risk of blockage of the demister 20 and reduces the overall water consumption of the desulfurization system. Since the flue gas is continuously washed during the continuous flushing of the demister 20, it can Significantly reduces dust in flue gas.

Abstract

Disclosed in the present invention are a flushing water recirculation system and method for a mist eliminator. An outlet of a mist eliminator flushing water tank is in communication with an inlet of a mist eliminator flushing water pump. An outlet of a recycled water tank is in communication with an inlet of a recycled water pump. An outlet of the recycled water pump and an outlet of the mist eliminator flushing water pump are merged by means of a pipeline and are then put in communication with one end of a clear water tank flushing water valve and a mist eliminator flushing water pipeline. The other end of the clear water tank flushing water valve is in communication with a clear water tank. A top opening of a mist eliminator flushing water collection tank faces the lower end of the mist eliminator. A bottom outlet of the mist eliminator flushing water collection tank is in communication with one end of a drain pipe of the water collection tank. The other end of the drain pipe of the water collection tank is inserted into the clear water tank. The top of the clear water tank is provided with a clear water tank bank overflow tank. An outlet of the clear water tank bank overflow tank is in communication with the recycled water tank. The present system and method can achieve the flushing water recirculation for a mist eliminator in an adsorption column, and reduces water consumption.

Description

一种除雾器冲洗水循环利用系统及方法System and method for recycling flushing water of demister 技术领域technical field
本发明属于节水技术领域，涉及一种除雾器冲洗水循环利用系统及方法。The invention belongs to the technical field of water saving, and relates to a system and method for recycling flushing water of a mist eliminator.
背景技术Background technique
脱硫吸收塔普遍配置高效屋脊式除雾器，但是超低排放改造后，脱硫系统水平衡难以保证，只能减少脱硫系统用水量最大设备除雾器的冲洗频次，从而引发除雾器堵塞，坍塌等情况频发，严重威胁机组安全运行。因此需要开发吸收塔内除雾器冲洗水循环利用技术，增加除雾器冲洗频次，甚至连续冲洗，彻底解决脱硫系统水平衡问题，使除雾器能高效稳定运行，同时实现机组水耗。Desulfurization absorption towers are generally equipped with high-efficiency roof-mounted demisters. However, after ultra-low emission transformation, it is difficult to ensure the water balance of the desulfurization system. We can only reduce the flushing frequency of the demister, which consumes the most water in the desulfurization system, which will cause blockage and collapse of the demister. Such situations occur frequently, seriously threatening the safe operation of the unit. Therefore, it is necessary to develop the flushing water recycling technology of the demister in the absorption tower, increase the flushing frequency of the demister, and even flush continuously, so as to completely solve the water balance problem of the desulfurization system, so that the demister can operate efficiently and stably, and at the same time realize the water consumption of the unit.
技术问题technical problem
本发明的目的在于克服上述现有技术的缺点，提供了一种除雾器冲洗水循环利用系统及方法，该系统及方法能够实现吸收塔内除雾器冲洗水的循环利用，减少耗水量。The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a system and method for recycling flushing water of the demister, which can realize the recycling of the flushing water of the demister in the absorption tower and reduce water consumption.
技术解决方案technical solution
为达到上述目的，本发明所述的除雾器冲洗水循环利用系统包括除雾器冲洗水箱、澄清水箱、回用水箱、除雾器冲洗水汇集水槽、汇集水槽排水管、回用水泵及除雾器冲洗水管；In order to achieve the above purpose, the demister flushing water recycling system of the present invention includes a demister flushing water tank, a clarified water tank, a reuse water tank, a demister flushing water collection tank, a collection tank drainage pipe, a reuse water pump and a demister flushing water pipe;
除雾器冲洗水箱的出口与除雾器冲洗水泵的入口相连通，回用水箱的出口与回用水泵的入口相连通，回用水泵的出口与除雾器冲洗水泵的出口通过管道并管后与澄清水箱冲洗水阀的一端及除雾器冲洗水管相连通，澄清水箱冲洗水阀的另一端与澄清水箱相连通，除雾器冲洗水汇集水槽的顶部开口正对除雾器的下端，除雾器冲洗水汇集水槽的底部出口与汇集水槽排水管的一端相连通，汇集水槽排水管的另一端插入于澄清水箱内；The outlet of the demister rinsing water tank is connected with the inlet of the demister rinsing water pump, the outlet of the reuse water tank is connected with the inlet of the recycle water pump, and the outlet of the recycle water pump and the outlet of the demister rinsing water pump are connected through pipelines It is connected with one end of the flushing water valve of the clarified water tank and the flushing water pipe of the demister, and the other end of the flushing water valve of the clarified water tank is connected with the clarified water tank. The outlet at the bottom of the water collecting tank of the fogger is connected to one end of the drain pipe of the collecting tank, and the other end of the drain pipe of the collecting tank is inserted into the clarified water tank;
澄清水箱的顶部设置有澄清水箱围堰溢流槽，澄清水箱围堰溢流槽的出口与回用水箱相连通。The top of the clarification water tank is provided with a cofferdam overflow tank of the clarification water tank, and the outlet of the cofferdam overflow tank of the clarification water tank is connected with the reuse water tank.
回用水泵的出口处设置有回用水关断阀。The outlet of the reclaimed water pump is provided with a reclaimed water shut-off valve.
除雾器冲洗水泵的出口处设置有除雾器冲洗水关断阀。The outlet of the demister flushing water pump is provided with a demister flushing water shut-off valve.
澄清水箱的底部出口分为两路，其中一路与澄清水箱底流泵相连通，另一路与脱硫岛排水坑相连通。The bottom outlet of the clarification water tank is divided into two paths, one of which is connected with the bottom flow pump of the clarification water tank, and the other is connected with the drainage pit of the desulfurization island.
澄清水箱的底部出口与澄清水箱底流泵之间设置有澄清水箱底流泵入口阀。An inlet valve of the underflow pump of the clarified water tank is arranged between the bottom outlet of the clarified water tank and the underflow pump of the clarified water tank.
澄清水箱的底部出口与脱硫岛排水坑之间设置有澄清水箱放空阀。A vent valve for the clarified water tank is set between the bottom outlet of the clarified water tank and the drainage pit of the desulfurization island.
回用水箱内设置有回用水箱搅拌器及回用水箱液位计。The recycled water tank is provided with a recycled water tank agitator and a recycled water tank liquid level gauge.
澄清水箱围堰溢流槽的出口经溢流水管与回用水箱相连通。The outlet of the overflow tank of the cofferdam of the clarified water tank is connected with the reuse water tank through the overflow water pipe.
一种脱硫吸收塔除雾器冲洗水循环利用方法，包括以下步骤：A method for recycling flushing water of a desulfurization absorption tower demister, comprising the following steps:
打开澄清水箱冲洗水阀，通过除雾器冲洗水泵向澄清水箱内注水，直至澄清水箱中的液位高于设计液位，再关闭澄清水箱冲洗水阀；Open the flushing water valve of the clarified water tank, inject water into the clarified water tank through the flushing water pump of the demister until the liquid level in the clarified water tank is higher than the design level, and then close the flushing water valve of the clarified water tank;
打开除雾器冲洗水泵，间断冲洗除雾器；Turn on the flushing water pump of the demister and flush the demister intermittently;
冲洗除雾器后的冲洗水，经除雾器的倾斜叶片间隙，导流至除雾器冲洗水汇集水槽中，并自流至澄清水箱中；After flushing the mist eliminator, the flushing water passes through the gap between the inclined blades of the mist eliminator, guides it to the flushing water collection tank of the mist eliminator, and flows into the clarification water tank by itself;
当澄清水箱达到最高液位时，通过澄清水箱围堰溢流槽溢流至回用水箱；When the clarified water tank reaches the highest liquid level, it overflows to the reuse water tank through the overflow tank of the cofferdam of the clarified water tank;
关闭除雾器冲洗水泵，打开回用水泵，开始采用回用水冲洗除雾器。Turn off the demister flushing pump, turn on the return water pump, and start flushing the demister with return water.
有益效果Beneficial effect
本发明具有以下有益效果：The present invention has the following beneficial effects:
本发明所述的除雾器冲洗水循环利用系统及方法在具体操作时，先通过除雾器冲洗水泵向澄清水箱内注水，直至澄清水箱中的液位高于设计液位，再利用澄清水箱对除雾器进行冲洗，其中，通过除雾器冲洗水汇集水槽收集除雾器冲洗水至澄清水箱中，澄清后的清水循环冲洗除雾器，以实现除雾器冲洗水循环利用的目的，解决机组脱硫系统水平衡的问题，减少耗水量。When the demister flushing water recycling system and method of the present invention are operated specifically, water is injected into the clarified water tank through the demister flushing water pump until the liquid level in the clarified water tank is higher than the design liquid level, and then the clarified water tank is used to The demister is flushed, wherein, the demister flushing water is collected through the demister flushing water collection tank to the clarified water tank, and the clarified water is circulated to flush the demister, so as to realize the purpose of recycling the demister flushing water and solve the problem of the unit The problem of water balance in the desulfurization system reduces water consumption.
附图说明Description of drawings
图1为本发明的系统图；Fig. 1 is a system diagram of the present invention;
图2为实施例1中除雾器冲洗水汇集水槽4布置的结构示意图；Fig. 2 is the structural schematic diagram of the arrangement of the flushing water collection tank 4 of the mist eliminator in embodiment 1;
图3为实施例2中除雾器冲洗水汇集水槽4布置的结构示意图。FIG. 3 is a schematic structural diagram of the arrangement of the flushing water collection tank 4 of the demister in Embodiment 2. FIG.
其中，1-除雾器冲洗水箱，2-澄清水箱，3-回用水箱，4-除雾器冲洗水汇集水槽，5-汇集水槽排水管，6-除雾器冲洗水泵，7-除雾器冲洗水关断阀，8-澄清水箱冲洗水阀，9-澄清水箱围堰溢流槽，10-澄清水箱底流泵，11-澄清水箱底流泵入口阀，12-澄清水箱放空阀，13-脱硫岛排水坑，14-溢流水管，15-回用水箱搅拌器，16-回用水箱液位计，17-回用水泵，18-回用水关断阀，19-除雾器支撑梁，20-除雾器，21-除雾器冲洗水管。Among them, 1- Demister flushing water tank, 2- Clarifying water tank, 3- Reuse water tank, 4- Demister flushing water collection tank, 5- Collection tank drain, 6- Demister flushing water pump, 7- Demisting Rinse water shut-off valve, 8-clarifying water tank flushing water valve, 9-clarifying water tank cofferdam overflow tank, 10-clarifying water tank underflow pump, 11-clarifying water tank underflow pump inlet valve, 12-clarifying water tank emptying valve, 13- Drainage pit of desulfurization island, 14-overflow pipe, 15-return water tank agitator, 16-return water tank level gauge, 17-return water pump, 18-return water shut-off valve, 19-demister support beam, 20-mist eliminator, 21-mist eliminator flushing water pipe.
本发明的最佳实施方式BEST MODE FOR CARRYING OUT THE INVENTION
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，不是全部的实施例，而并非要限制本发明公开的范围。此外，在以下说明中，省略了对公知结构和技术的描述，以避免不必要的混淆本发明公开的概念。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are a part of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
在附图中示出了根据本发明公开实施例的结构示意图。这些图并非是按比例绘制的，其中为了清楚表达的目的，放大了某些细节，并且可能省略了某些细节。图中所示出的各种区域、层的形状及它们之间的相对大小、位置关系仅是示例性的，实际中可能由于制造公差或技术限制而有所偏差，并且本领域技术人员根据实际所需可以另外设计具有不同形状、大小、相对位置的区域/层。The schematic diagrams of the structures according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not drawn to scale, with certain details exaggerated and possibly omitted for clarity of presentation. The shapes of various regions and layers shown in the figure and their relative sizes and positional relationships are only exemplary, and may deviate due to manufacturing tolerances or technical limitations in practice, and those skilled in the art may Regions/layers with different shapes, sizes, and relative positions can be additionally designed as needed.
参考图1，本发明所述的除雾器冲洗水循环利用系统,包括除雾器冲洗水箱1、澄清水箱2、回用水箱3、除雾器冲洗水汇集水槽4及汇集水槽排水管5；Referring to Fig. 1, the demister flushing water recycling system of the present invention includes a demister flushing water tank 1, a clarified water tank 2, a reuse water tank 3, a demister flushing water collection tank 4 and a collection tank drain pipe 5;
除雾器冲洗水箱1的出口与除雾器冲洗水泵6的入口相连通，回用水箱3的出口与回用水泵17的入口相连通，回用水泵17的出口与除雾器冲洗水泵6的出口通过管道并管后与澄清水箱冲洗水阀8的一端及除雾器冲洗水管21相连通，回用水泵17的出口处设置有回用水关断阀18，除雾器冲洗水泵6的出口处设置有除雾器冲洗水关断阀7，澄清水箱冲洗水阀8的另一端与澄清水箱2相连通，除雾器冲洗水汇集水槽4的顶部开口正对除雾器20的下端，除雾器冲洗水汇集水槽4的底部出口与汇集水槽排水管5的一端相连通，汇集水槽排水管5的另一端插入于澄清水箱2内；The outlet of the demister flushing water tank 1 is connected with the inlet of the demister flushing water pump 6, the outlet of the reuse water tank 3 is connected with the inlet of the reuse water pump 17, and the outlet of the reuse water pump 17 is connected with the inlet of the demister flush water pump 6. The outlet is connected with one end of the flushing water valve 8 of the clarified water tank and the flushing water pipe 21 of the demister after being piped together. The demister flushing water shut-off valve 7 is provided, the other end of the clarified water tank flushing water valve 8 is connected with the clarified water tank 2, and the top opening of the demister flushing water collection tank 4 faces the lower end of the demister 20, and the demister The outlet at the bottom of the flushing water collection tank 4 is connected to one end of the collection tank drain pipe 5, and the other end of the collection tank drain pipe 5 is inserted into the clarified water tank 2;
澄清水箱2的顶部设置有澄清水箱围堰溢流槽9，澄清水箱围堰溢流槽9的出口经溢流水管14与回用水箱3相连通。The top of the clarified water tank 2 is provided with a clarified water tank cofferdam overflow tank 9 , and the outlet of the clarified water tank cofferdam overflow tank 9 communicates with the reuse water tank 3 through an overflow water pipe 14 .
澄清水箱2的底部出口分为两路，其中一路经澄清水箱底流泵入口阀11与澄清水箱底流泵10相连通，另一路经澄清水箱放空阀12与脱硫岛排水坑13相连通。The outlet at the bottom of the clarified water tank 2 is divided into two paths, one of which is connected to the underflow pump 10 of the clarified water tank through the inlet valve 11 of the underflow pump of the clarified water tank, and the other is connected to the drainage pit 13 of the desulfurization island through the vent valve 12 of the clarified water tank.
回用水箱3内设置有回用水箱搅拌器15及回用水箱液位计16。The recycled water tank 3 is provided with a recycled water tank agitator 15 and a recycled water tank liquid level gauge 16 .
本发明所述的脱硫吸收塔除雾器冲洗水循环利用方法包括以下步骤：The desulfurization absorption tower mist eliminator flushing water recycling method of the present invention comprises the following steps:
系统启动前，关闭回用水关断阀18，打开除雾器冲洗水关断阀7，关闭澄清水箱底流泵入口阀11及澄清水箱放空阀12。Before starting the system, close the shut-off valve 18 for reused water, open the shut-off valve 7 for flushing water of the demister, close the inlet valve 11 of the underflow pump of the clarified water tank and the vent valve 12 of the clarified water tank.
打开澄清水箱冲洗水阀8，通过除雾器冲洗水泵6向澄清水箱2内注水，直至澄清水箱2中的液位高于设计液位，再关闭澄清水箱冲洗水阀8，其中，设计液位高于插入澄清水箱2内的汇集水槽排水管5最低处加上吸收塔内最大烟气压力折算得到的液柱；Open the flushing water valve 8 of the clarified water tank, inject water into the clarified water tank 2 through the flushing water pump 6 of the demister until the liquid level in the clarified water tank 2 is higher than the design liquid level, and then close the flushing water valve 8 of the clarified water tank, wherein the design liquid level It is higher than the liquid column obtained by adding the lowest part of the drainage pipe 5 of the collection tank inserted into the clarified water tank 2 and the maximum flue gas pressure in the absorption tower;
打开除雾器冲洗水泵6，间断冲洗除雾器20；Turn on the demister flushing water pump 6, and intermittently flush the demister 20;
冲洗除雾器20后的冲洗水，经除雾器20的倾斜叶片间隙，导流至除雾器冲洗水汇集水槽4中，并通过汇集水槽排水管5自流至澄清水箱2中，汇集水槽排水管5插入澄清水箱2的液面以下，可以起到水封作用，避免吸收塔中的烟气逃逸至澄清水箱2；After rinsing the demister 20, the flushing water passes through the gap between the inclined blades of the demister 20, and then flows into the demister flushing water collection tank 4, and flows into the clarified water tank 2 through the collection tank drainage pipe 5, and the collection tank drains The pipe 5 is inserted below the liquid level of the clarified water tank 2, which can act as a water seal and prevent the flue gas in the absorption tower from escaping to the clarified water tank 2;
当澄清水箱2达到最高液位时，通过澄清水箱围堰溢流槽9及溢流水管14，将澄清后的清水溢流至回用水箱3；When the clarified water tank 2 reaches the highest liquid level, the clarified clear water overflows to the reuse water tank 3 through the cofferdam overflow groove 9 and the overflow water pipe 14 of the clarified water tank;
关闭除雾器冲洗水泵6及除雾器冲洗水关断阀7，打开回用水关断阀18及回用水泵17，开始采用回用水冲洗除雾器20。Close the demister flushing water pump 6 and the demister flushing water shut-off valve 7, open the return water shut-off valve 18 and the return water pump 17, and start to use the return water to flush the demister 20.
需要说明的是，采用间断冲洗方式或连续冲洗方式利用回用水循环冲洗除雾器20。It should be noted that the demister 20 is flushed with recycled water in an intermittent flushing manner or in a continuous flushing manner.
当回用水箱3的液位低于最低液位时，则向回用水箱3中直接补水，使回用水冲洗系统达到动态平衡，即启动除雾器冲洗水泵6，采用除雾器20冲洗水冲洗除雾器20，以补充回用水箱3的冲洗水量，使回用水冲洗系统达到动态平衡。When the liquid level of the reuse water tank 3 is lower than the minimum liquid level, then directly replenish water to the reuse water tank 3, so that the reuse water flushing system reaches a dynamic balance, that is, start the demister flushing water pump 6, and use the mist eliminator 20 to flush the water Rinse the mist eliminator 20 to supplement the flushing water volume of the reused water tank 3, so that the recycled water flushing system can reach a dynamic balance.
另外，需要定期打开澄清水箱底流泵入口阀11，通过澄清水箱底流泵10冲洗脱硫系统管道、泵，降低澄清水箱2内水的含固量，达到动态平衡。In addition, it is necessary to periodically open the inlet valve 11 of the underflow pump of the clarified water tank to flush the pipes and pumps of the desulfurization system through the underflow pump 10 of the clarified water tank to reduce the solid content of the water in the clarified water tank 2 and achieve dynamic balance.
同时需要定期打开澄清水箱放空阀12，将澄清水箱2底部高含固量的水定期放空至脱硫岛排水坑13，以降低澄清水箱2水中含固量，达到动态平衡。At the same time, it is necessary to regularly open the vent valve 12 of the clarified water tank, and regularly empty the water with high solid content at the bottom of the clarified water tank 2 to the desulfurization island drainage pit 13, so as to reduce the solid content in the water of the clarified water tank 2 and achieve dynamic balance.
实施例1Example 1
参考图2，第一层除雾器20及第三层除雾器20为屋脊式结构，且布置于底层除雾器支撑梁19上，第二层除雾器20均为倒屋脊式结构，且与第三层除雾器20共同布置于上部除雾器支撑梁19上；除雾器冲洗水汇集水槽4布置于底层除雾器支撑梁19侧面或底部。Referring to Fig. 2, the first layer of mist eliminators 20 and the third layer of mist eliminators 20 are roof-like structures, and are arranged on the support beam 19 of the bottom layer of mist eliminators, and the second layer of mist eliminators 20 are all inverted roof-ridge structures. And the third layer of demister 20 is arranged on the upper support beam 19 of the demister;
实施例2Example 2
参考图3，三层除雾器20均为屋脊式结构，分别布置于三层除雾器支撑梁19；除雾器冲洗水汇集水槽4布置于底层除雾器支撑梁19的侧面或底部。Referring to FIG. 3 , the three-layer mist eliminators 20 are all roof-ridge structures, and are respectively arranged on the three-layer mist eliminator support beams 19 ;
本发明的主要特点为：Main features of the present invention are:
本发明利用除雾器冲洗水汇集水槽4收集除雾器20冲洗水至澄清水箱2，澄清后的清水循环冲洗除雾器20，澄清水箱2底部的浑浊水冲洗脱硫系统管道、泵或者排放至脱硫岛排水坑13，以最简单可行的方式实现除雾器20冲洗水循环利用的目的，解决困扰大部分机组脱硫系统水平衡问题，同时获得以下效果：The present invention utilizes the demister flushing water collection tank 4 to collect the demister 20 flushing water to the clarified water tank 2, the clarified clear water circulates to flush the demister 20, and the turbid water at the bottom of the clarified water tank 2 flushes the desulfurization system pipeline, pump or discharges to The desulfurization island drainage pit 13 achieves the purpose of recycling the flushing water of the demister 20 in the simplest and feasible way, solves the problem of water balance in the desulfurization system of most units, and obtains the following effects at the same time:
当采用间断方式冲洗除雾器20时，本发明可增加冲洗除雾器20的频率，减少除雾器20的堵塞风险，减少脱硫系统的整体水耗。When the mist eliminator 20 is flushed intermittently, the present invention can increase the frequency of flushing the mist eliminator 20, reduce the clogging risk of the mist eliminator 20, and reduce the overall water consumption of the desulfurization system.
当采用连续冲洗的方式冲洗除雾器20时，本发明彻底解决除雾器20堵塞风险，减少了脱硫系统整体水耗，由于连续冲洗除雾器20的过程中，同时连续洗涤烟气，可显著减少烟气中粉尘。When the demister 20 is flushed by continuous flushing, the present invention completely solves the risk of blockage of the demister 20 and reduces the overall water consumption of the desulfurization system. Since the flue gas is continuously washed during the continuous flushing of the demister 20, it can Significantly reduces dust in flue gas.

Claims (9)

  1. 一种除雾器冲洗水循环利用系统，其特征在于，包括除雾器冲洗水箱（1）、澄清水箱（2）、回用水箱（3）、除雾器冲洗水汇集水槽（4）、汇集水槽排水管（5）、回用水泵（17）及除雾器冲洗水管（21）；A demister flushing water recycling system, characterized in that it includes a demister flushing water tank (1), a clarified water tank (2), a reuse water tank (3), a demister flushing water collection tank (4), and a collection water tank Drainage pipe (5), recycling water pump (17) and demister flushing water pipe (21);
    除雾器冲洗水箱（1）的出口与除雾器冲洗水泵（6）的入口相连通，回用水箱（3）的出口与回用水泵（17）的入口相连通，回用水泵（17）的出口与除雾器冲洗水泵（6）的出口通过管道并管后与澄清水箱冲洗水阀（8）的一端及除雾器冲洗水管（21）相连通，澄清水箱冲洗水阀（8）的另一端与澄清水箱（2）相连通，除雾器冲洗水汇集水槽（4）的顶部开口正对除雾器（20）的下端，除雾器冲洗水汇集水槽（4）的底部出口与汇集水槽排水管（5）的一端相连通，汇集水槽排水管（5）的另一端插入于澄清水箱（2）内；The outlet of the demister flushing water tank (1) is connected with the inlet of the demister flushing water pump (6), the outlet of the recycling water tank (3) is connected with the inlet of the recycling water pump (17), and the recycling water pump (17) The outlet of the demister flushing water pump (6) passes through the pipe and connects with one end of the clarified water tank flushing water valve (8) and the demister flushing water pipe (21), and the clarified water tank flushing water valve (8) The other end is connected with the clarified water tank (2), the top opening of the demister flushing water collection tank (4) is facing the lower end of the demister (20), and the bottom outlet of the demister flushing water collection tank (4) is connected to the One end of the sink drain pipe (5) is connected, and the other end of the sink drain pipe (5) is inserted into the clarified water tank (2);
    澄清水箱（2）的顶部设置有澄清水箱围堰溢流槽（9），澄清水箱围堰溢流槽（9）的出口与回用水箱（3）相连通。The top of the clarification water tank (2) is provided with a clarification water tank cofferdam overflow groove (9), and the outlet of the clarification water tank cofferdam overflow groove (9) is connected with the reuse water tank (3).
  2. 根据权利要求1所述的除雾器冲洗水循环利用系统，其特征在于，回用水泵（17）的出口处设置有回用水关断阀（18）。The flushing water recycling system for the demister according to claim 1, characterized in that a recycling water shut-off valve (18) is provided at the outlet of the recycling water pump (17).
  3. 根据权利要求1所述的除雾器冲洗水循环利用系统，其特征在于，除雾器冲洗水泵（6）的出口处设置有除雾器冲洗水关断阀（7）。The demister flushing water recycling system according to claim 1, characterized in that a demister flushing water shut-off valve (7) is provided at the outlet of the demister flushing water pump (6).
  4. 根据权利要求1所述的除雾器冲洗水循环利用系统，其特征在于，澄清水箱（2）的底部出口分为两路，其中一路与澄清水箱底流泵（10）相连通，另一路与脱硫岛排水坑（13）相连通。The flushing water recycling system for the demister according to claim 1, characterized in that the bottom outlet of the clarified water tank (2) is divided into two paths, one of which is connected with the bottom flow pump (10) of the clarified water tank, and the other is connected with the desulfurization island The drainage pit (13) is connected.
  5. 根据权利要求4所述的除雾器冲洗水循环利用系统，其特征在于，澄清水箱（2）的底部出口与澄清水箱底流泵（10）之间设置有澄清水箱底流泵入口阀（11）。The flushing water recycling system for the demister according to claim 4, characterized in that an inlet valve (11) for the underflow pump of the clarified water tank (11) is provided between the bottom outlet of the clarified water tank (2) and the underflow pump (10) of the clarified water tank.
  6. 根据权利要求4所述的除雾器冲洗水循环利用系统，其特征在于，澄清水箱（2）的底部出口与脱硫岛排水坑（13）之间设置有澄清水箱放空阀（12）。The flushing water recycling system for the demister according to claim 4, characterized in that a clarified water tank vent valve (12) is provided between the bottom outlet of the clarified water tank (2) and the desulfurization island drainage pit (13).
  7. 根据权利要求1所述的除雾器冲洗水循环利用系统，其特征在于，回用水箱（3）内设置有回用水箱搅拌器（15）及回用水箱液位计（16）。The flushing water recycling system for the demister according to claim 1, characterized in that, the recycled water tank (3) is provided with a recycled water tank agitator (15) and a recycled water tank level gauge (16).
  8. 根据权利要求1所述的除雾器冲洗水循环利用系统，其特征在于，澄清水箱围堰溢流槽（9）的出口经溢流水管（14）与回用水箱（3）相连通。The flushing water recycling system for the demister according to claim 1, characterized in that the outlet of the cofferdam overflow tank (9) of the clarified water tank is connected to the reuse water tank (3) through the overflow water pipe (14).
  9. 一种脱硫吸收塔除雾器冲洗水循环利用方法，其特征在于，基于权利要求1所述的除雾器冲洗水循环利用系统，包括以下步骤：A desulfurization absorption tower demister flushing water recycling method, characterized in that, based on the demister flushing water recycling system described in claim 1, comprising the following steps:
    打开澄清水箱冲洗水阀（8），通过除雾器冲洗水泵（6）向澄清水箱（2）内注水，直至澄清水箱（2）中的液位高于设计液位，再关闭澄清水箱冲洗水阀（8）；Open the flushing water valve (8) of the clarified water tank, fill the clarified water tank (2) with water through the flushing water pump (6) of the demister until the liquid level in the clarified water tank (2) is higher than the design liquid level, and then close the flushing water of the clarified water tank valve (8);
    打开除雾器冲洗水泵（6），间断冲洗除雾器（20）；Turn on the demister flushing pump (6), and intermittently flush the demister (20);
    冲洗除雾器（20）后的冲洗水，经除雾器（20）的倾斜叶片间隙，导流至除雾器冲洗水汇集水槽（4）中，并自流至澄清水箱（2）中；The flushing water after rinsing the demister (20) passes through the gap between the inclined blades of the demister (20), diverts to the flushing water collection tank (4) of the demister, and flows into the clarified water tank (2) by itself;
    当澄清水箱（2）达到最高液位时，通过澄清水箱围堰溢流槽（9）溢流至回用水箱（3）；When the clarified water tank (2) reaches the highest liquid level, it overflows to the reuse water tank (3) through the cofferdam overflow groove (9) of the clarified water tank;
    关闭除雾器冲洗水泵（6），打开回用水泵（17），开始采用回用水冲洗除雾器（20）。Turn off the demister flushing water pump (6), turn on the return water pump (17), and start flushing the demister (20) with return water.
PCT/CN2022/102269 2021-07-30 2022-06-29 Flushing water recirculation system and method for mist eliminator WO2023005577A1 (en)

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