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WO2023029300A1 - Tour d'adsorption à lit mobile et système de purification de gaz de combustion doté de celle-ci - Google Patents

Tour d'adsorption à lit mobile et système de purification de gaz de combustion doté de celle-ci Download PDF

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Publication number
WO2023029300A1
WO2023029300A1 PCT/CN2021/139329 CN2021139329W WO2023029300A1 WO 2023029300 A1 WO2023029300 A1 WO 2023029300A1 CN 2021139329 W CN2021139329 W CN 2021139329W WO 2023029300 A1 WO2023029300 A1 WO 2023029300A1
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WIPO (PCT)
Prior art keywords
flue gas
moving bed
adsorption tower
bed adsorption
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/139329
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English (en)
Chinese (zh)
Inventor
汪世清
许世森
郜时旺
肖平
刘练波
牛红伟
黄斌
雷中辉
张再明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huaneng Clean Energy Research Institute
China Huaneng Group Co Ltd
Original Assignee
Huaneng Clean Energy Research Institute
China Huaneng Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huaneng Clean Energy Research Institute, China Huaneng Group Co Ltd filed Critical Huaneng Clean Energy Research Institute
Publication of WO2023029300A1 publication Critical patent/WO2023029300A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B01D53/02—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 adsorption, e.g. preparative gas chromatography
    • B01D53/06—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
    • B01D53/08—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds according to the "moving bed" method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • 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
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the disclosure relates to the technical field of flue gas treatment, in particular to a moving bed adsorption tower and a flue gas purification system with the moving bed adsorption tower.
  • the related technology adopts the moving bed adsorption tower to make the adsorbent flow in the tower, so as to overcome the problem that the adsorption capacity of the fixed bed adsorption tower decreases with the prolongation of use time, but there are still uneven distribution of flue gas and poor purification effect in the moving bed adsorption tower. Ideal question.
  • the present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, embodiments of the present disclosure provide a moving bed adsorption tower, which has the advantages of uniform adsorption and good adsorption effect.
  • Embodiments of the present disclosure also propose a flue gas purification system comprising the above-mentioned moving bed adsorption tower.
  • the moving bed adsorption tower includes a tower body, the tower body has a cavity, and the tower body is provided with a feeding port, a material outlet, a flue gas inlet and a flue gas outlet communicating with the cavity , the cavity includes a packing section filled with adsorbent; a distributor, the distributor is arranged in the tower body, the distributor is provided with a number of blanking ports, and the distributor is located below the packing section so that The adsorbent in the packing section flows out through the feeding opening; a plurality of feeding pipes correspond to a plurality of feeding openings one by one, and the feeding pipes are located in the corresponding Below the blanking port, the flue gas inlet is located below the blanking port, the blanking pipe is located above the discharge port,
  • the side wall of the falling tube is a hollow structure, and the side wall includes a plurality of grid bars arranged at intervals in the length direction of the dropping tube, and the length direction of the grid bars is the same as that of the falling tube.
  • the length directions of the material tubes are perpendicular to each other, and a flue gas passage is formed between two adjacent grid bars, and the grid bars are inclined inwardly and downwardly so that their bottom ends are located at the inner sides of their top ends.
  • the moving bed adsorption tower according to the embodiment of the present disclosure has the advantages of uniform material dropping speed and uniform adsorption effect.
  • the grid bar is a strip plate structure, and the included angle between the grid bar and the length direction of the discharge tube is 10°-80°.
  • the grid bars have a width of 20mm-100mm.
  • several grid bars are aligned in the length direction of the discharge tube, and among two adjacent grid bars, the bottom end of the upper grid bar is located at the top of the lower grid bar in the vertical direction below.
  • the distance between the top of the upper grid bar and the top of the lower grid bar is 10mm-100mm.
  • the distributor includes a distribution plate, and the material discharge port is arranged on the distribution plate, and the moving bed adsorption tower also includes a plurality of distribution pipes, and the plurality of distribution pipes are connected with the plurality of distribution pipes.
  • the distribution pipe is connected to the lower end surface of the distribution plate and extends downward from the distribution plate, and a plurality of the discharge pipes correspond to a plurality of the distribution pipes one by one, so The lower end of the distribution pipe extends into the upper end of the corresponding drop pipe, there is a gap between the top end of the drop pipe and the lower end surface of the distribution plate, and the distribution pipe and the corresponding drop There are spaces between the tubes, and the flue gas inlet is located below the distribution plate.
  • the drop tube is a square tube, and the drop tube includes opposite first and second side walls, and opposite third and fourth side walls.
  • first side wall and the second side wall are configured as a hollow structure
  • third side wall and the fourth side wall are configured as a hollow structure
  • the drop tube extends vertically, and the length of the drop tube in the vertical direction is 400mm-800mm.
  • the flue gas purification system includes a flue gas cooling device, the flue gas cooling device has a smoke inlet and a smoke outlet, and the flue gas cooling device is used to convert the smoke entering from the smoke inlet into The gas is cooled to room temperature and below; the moving bed adsorption tower, the moving bed adsorption tower is the moving bed adsorption tower according to any one of the above-mentioned embodiments, the smoke outlet of the flue gas cooling device is connected with the moving bed adsorption tower The outlet of the flue gas is connected, and the moving bed adsorption tower is used to adsorb the flue gas.
  • FIG. 1 is a front view of a moving bed adsorption column according to an embodiment of the present disclosure.
  • FIG. 2 is a top view of a moving bed adsorption column according to an embodiment of the disclosure.
  • FIG. 3 is a sectional view of FIG. 2 .
  • Fig. 4 is a cross-sectional view at B-B in Fig. 3 .
  • Fig. 5 is a schematic diagram of the drop tube in Fig. 3 .
  • Fig. 6 is a cross-sectional view of the drop tube in Fig. 3 .
  • Fig. 7 is a cross-sectional view at B-B in Fig. 3 according to another embodiment of the present disclosure.
  • Fig. 8 is a cross-sectional view of the distributor in Fig. 3 .
  • FIG. 9 is a cross-sectional view of FIG. 2 according to another embodiment of the present disclosure.
  • FIG. 10 is a cross-sectional view of a distributor according to another embodiment of the present disclosure.
  • Tower body 1 feeding port 11; flue gas outlet 12; flue gas inlet 13; material outlet 14;
  • Distributor 2 Distributor 2; distribution plate 21; discharge port 22; distribution pipe 23;
  • a moving bed adsorption tower includes a tower body 1 , a distributor 2 and a plurality of downpipes 3 .
  • the tower body 1 is provided with a feeding port 11, a material outlet 14, a flue gas inlet 13 and a flue gas outlet 12 communicating with the cavity, and the cavity includes a packing section filled with adsorbent.
  • the feeding port 11 is located at the upper end of the tower body 1
  • the discharge port 14 is located at the lower end of the tower body 1
  • the flue gas inlet 13 is located at the lower side of the front end of the tower body 1
  • the flue gas outlet 12 is located at the upper side of the tower body 1 front end.
  • the flue gas flow direction is from the flue gas inlet 13 to the flue gas outlet 12, the adsorbent enters the tower body 1 from the upper side of the tower body 1 and flows out from the lower end of the tower body 1, the flow direction of the flue gas Contrary to the flow direction of the adsorbent, the concentration of nitrogen and sulfur in the flue gas gradually decreases as the flue gas rises, and the adsorption effect of the adsorbent gradually decreases with the contact time with the flue gas, and the flue gas with lower nitrogen and sulfur concentrations is better
  • the adsorption effect of the adsorbent contact can effectively reduce the concentration of nitrogen and sulfur in the gas discharged from the flue gas outlet 12, and improve the adsorption efficiency.
  • the distributor 2 is arranged in the tower body 1 , and the distributor 2 is provided with a number of feeding openings 22 , and the distributor 2 is located below the packing section so that the adsorbent in the packing section can flow out through the feeding openings 22 .
  • the discharge openings 22 are elongated through holes on the distributor 2 , and the discharge openings 22 are arranged in parallel and at intervals with equal intervals.
  • the flow rate of the adsorbent through the evenly arranged discharge ports 22 is approximately the same, which on the one hand slows down the flow rate of the adsorbent and increases the contact time between the adsorbent particles and the flue gas, and on the other hand avoids the concentration of the adsorbent Flowing out from a position closer to the center of the tower body 1 creates a dead angle in the flow, which improves the flow efficiency of the adsorbent, thereby improving the adsorption effect.
  • Multiple blanking tubes 3 correspond to multiple blanking ports 22 one by one, the blanking tube 3 is located below the corresponding blanking port 22, the flue gas inlet 13 is located below the blanking port 22, and the blanking tube 3 is located at the discharge port 22. above port 14.
  • the geometric center of the blanking opening 22 in the horizontal direction is the same as the geometric center of the blanking tube 3 in the horizontal direction.
  • the upper end of the blanking tube 3 is spaced from the lower end of the distributor 2.
  • the bottom of the blanking opening 22 ensures that the flue gas inlet 13 is completely located under the blanking opening 22 .
  • the side wall of the blanking tube 3 is a hollow structure, and the side wall includes a plurality of gratings arranged at intervals in the length direction of the blanking tube 3, and the length direction of the grating bars is perpendicular to the length direction of the blanking tube 3
  • a flue gas channel that allows flue gas to circulate is formed between two adjacent grid bars, and the grid bars are inclined inward and downward so that their bottom ends are located on the inner side of their top ends.
  • the cross-section of the blanking tube 3 is a strip-shaped rectangle, and grid bars are arranged on the left and right side walls of the blanking tube 3, and the blanking tube 3 extends vertically, and the grid bars Extending along the front-to-back direction, the grid bars are arranged in parallel and spaced from top to bottom, and each grid bar is inclined inwardly and downwardly from the outer wall of the discharge tube 3 .
  • the grid bar is a strip-shaped plate structure, and the angle between the grid bar and the length direction of the discharge tube 3 is 10°-80°.
  • the angle between the grid bar and the length direction of the blanking tube 3 is the angle between the plane where the grid bar is located and the side wall of the blanking tube 3 where the grid bar is located. In some embodiments, the included angle between the grid bar and the longitudinal direction of the drop tube 3 is 45°. Such an arrangement is an optimal choice for balancing the ventilation rate of the sidewall of the downcomer 3 and the quality of the adsorbent overflowing from the sidewall of the downcomer 3 .
  • the grid bars have a width of 20mm-100mm.
  • the width of a grid bar refers to the horizontal distance between the top and bottom of a single grid bar in the horizontal direction. In some embodiments, the width of the bars is 40mm.
  • several grid bars are aligned in the length direction of the discharge tube 3 , and among two adjacent grid bars, the bottom end of the upper grid bar is located below the top end of the lower grid bar in the vertical direction.
  • a side wall of the blanking tube 3 is provided with several grid bars, and the grid bars are arranged in parallel and equally spaced in the vertical direction, that is, the positions of the grid bars in the horizontal direction are the same. In this way, the blocking of the adsorbent by the grid bar is reduced, and the adsorbent can fall smoothly from the discharge pipe 3 .
  • the distance between the top of the upper grid bar and the top of the lower grid bar is 10mm-100mm.
  • the distance between the top of the upper grid bar and the top of the lower grid bar is the vertical distance between two adjacent grid bars. In some embodiments, the distance between the top of the upper grid bar and the top of the lower grid bar is 55 mm, thus reducing the distance on the one hand and preventing the adsorbent particles from overflowing from between the grid bars; The wide spacing can effectively ensure the flow of air.
  • the distance between the drop tube 3 and the drop opening 22 is the vertical distance between the top of the drop tube 3 and the lower end of the distribution plate 21 . In some embodiments, the distance between the discharge tube 3 and the discharge opening 22 is 25 mm.
  • the distributor 2 includes a distribution plate 21, and the discharge opening 22 is arranged on the distribution plate 21.
  • the moving bed adsorption tower also includes a plurality of distribution pipes 23, and the plurality of distribution pipes 23 are connected with the plurality of discharge openings 22.
  • the distribution pipe 23 is connected to the lower end surface of the distribution plate 21 and extends downward from the distribution plate 21, and the plurality of drop pipes 3 correspond to the plurality of distribution pipes 23 one by one, and the lower end of the distribution pipe 23 extends into the corresponding drop.
  • the shape along the cross-section of the distribution pipe 23 is the same as the shape of the through hole on the distribution plate 21, the distribution pipe 23 is arranged in parallel and equidistant, the distribution pipe 23 extends along the vertical direction, and the distribution pipe The height of the lower end of 23 is lower than the height of the upper end of the feeding pipe 3, and there is a gap between the outer edge of the lower end of the distribution pipe 23 and the inner wall of the feeding pipe 3.
  • the adsorbent flowing out of the distribution pipe 23 can directly fall into the discharge pipe 3, avoiding overflowing from the gap between the distributor 2 and the discharge pipe 3 when the adsorbent enters the discharge pipe 3 from the distributor 2,
  • the flue gas splashes out of the adsorption tower through the flue gas inlet 13.
  • the drop tube 3 is a square tube, and the drop tube 3 includes opposite first and second side walls, and opposite third and fourth side walls.
  • the blanking openings 22 are arranged in parallel and at intervals, and a plurality of blanking openings 22 are arranged in multiple rows. 22 are arranged at intervals along the front and rear directions, and multiple rows of blanking ports 22 are arranged at intervals in the left and right directions, and two adjacent rows of blanking ports 22 are aligned in the second direction.
  • the tubes 3 correspond to the blanking openings 22 one by one, and the blanking tubes 3 are directly below the blanking openings 22 .
  • first side wall and the second side wall are set as a hollow structure
  • third side wall and the fourth side wall are set as a hollow structure
  • the blanking tube 3 is a square tube, and the two side walls in the front and back directions or the two side walls in the left and right directions are provided with grid bars. As a result, multiple rows of discharge openings 22 and discharge pipes 3 are provided to make the adsorbent particles drop more evenly, reduce dead angles in the flow of the adsorbent, and thus improve the adsorption efficiency.
  • the drop tube 3 extends vertically, and the length of the drop tube 3 in the vertical direction is 400mm-800mm.
  • the length of the drop tube 3 is 740mm, and such setting makes the downward flow of the adsorbent particles smooth.
  • the flue gas purification system includes a flue gas cooling device, the flue gas cooling device has a smoke inlet and a smoke outlet, and the flue gas cooling device is used to cool the flue gas entering from the smoke inlet to room temperature or below Moving bed adsorption tower, the moving bed adsorption tower is the moving bed adsorption tower according to any one of the above-mentioned embodiments, the flue gas outlet of the flue gas cooling device is communicated with the flue gas outlet 12 of the moving bed adsorption tower, and the moving bed adsorption tower is used for Smoke is adsorbed.
  • the temperature of the flue gas entering the flue gas inlet 13 ranges from -100°C to room temperature (for example, the room temperature is 25°C).
  • the sorbent is activated coke (carbon).
  • the flue gas purification system provided in this example adopts the low-temperature adsorption method when adsorbing the flue gas, and utilizes the dissolution characteristics and adsorption characteristics of the pollutant components in the flue gas at low temperatures to remove pollutants, and can simultaneously realize desulfurization and denitrification .
  • the sulfur dioxide in the flue gas is mainly physically adsorbed, the desorption temperature is low, the loss of the adsorbent is low, and the replenishment of the adsorbent is low, which reduces the operating cost.
  • the flue gas purification system that adsorbs at low temperature has a large adsorption capacity for pollutants, a small amount of adsorbent loading, and a small footprint for equipment such as moving bed adsorption towers.
  • the flue gas purification system provided in this example performs adsorption and purification of the flue gas
  • the NO x components that are difficult to remove in the flue gas are oxidized to NO by adsorption and removal at a low temperature through the mechanism of oxidation adsorption. It needs to inject NH3 for catalytic reduction, and the operation cost is low.
  • the flue gas purification system provided in this embodiment can absorb more than 99% of NOx in the flue gas, and the denitrification efficiency is obviously better than the 70-80% denitrification efficiency in the prior art.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch.
  • “above”, “above” and “above” the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • “Below”, “beneath” and “beneath” the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • the terms “one embodiment,” “some embodiments,” “example,” “specific examples,” or “some examples” mean a specific feature, structure, material, or feature described in connection with the embodiment or example. Features are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

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  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

L'invention concerne une tour d'adsorption à lit mobile et un système de purification de gaz de combustion le comprenant. La tour d'adsorption à lit mobile comprend un corps de tour (1), un distributeur (2) et une pluralité de tuyaux de chute de matériau (3), le corps de tour (1) est doté à l'intérieur d'une cavité, le corps de tour (1) est pourvu d'une entrée de gaz de combustion (13) et d'une sortie de gaz de combustion (12) qui sont en communication avec la cavité, et la cavité comprend un segment de remplissage rempli d'un adsorbant ; le distributeur (2) est disposé dans le corps de tour (1), le distributeur (2) est pourvu de plusieurs orifices de chute de matériau (22), et le distributeur (2) est situé au-dessous du segment de remplissage, de telle sorte que l'adsorbant dans le segment de remplissage s'écoule à travers les orifices de chute de matériau (22) ; et la pluralité de tuyaux de chute de matériau (3) correspondent à la pluralité d'orifices de chute de matériau (22) sur une base un à un, les tuyaux de chute de matériau (3) sont situés en dessous des orifices de chute de matériau correspondants (22), et l'entrée de gaz de combustion (13) est située au-dessous des orifices de chute de matériau (22). Au moins une partie de la paroi latérale du tuyau de chute de matériau (3) est d'une structure évidée, et la paroi latérale comprend plusieurs barres de grille agencées à des intervalles dans la direction de la longueur du tuyau de chute de matériau (3), un canal de gaz de combustion permettant à un gaz de combustion de s'écouler à travers celui-ci étant formé entre chaque deux barres de grille adjacentes, et la barre de grille s'incline vers l'intérieur et vers le bas, de telle sorte que son extrémité inférieure est située sur un côté interne de son extrémité supérieure.
PCT/CN2021/139329 2021-09-02 2021-12-17 Tour d'adsorption à lit mobile et système de purification de gaz de combustion doté de celle-ci Ceased WO2023029300A1 (fr)

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CN202111027091.4 2021-09-02
CN202111027091 2021-09-02
CN202111082831.4A CN113828112B (zh) 2021-09-02 2021-09-15 移动床吸附塔和烟气净化系统
CN202111082831.4 2021-09-15

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CN117282228A (zh) * 2023-11-23 2023-12-26 中国华能集团清洁能源技术研究院有限公司 具有烟气导流功能的低温烟气吸附塔和低温烟气吸附系统
CN120939698A (zh) * 2025-10-17 2025-11-14 山西立铂隆新材料有限公司 一种化工产品加工用活性炭吸附塔

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CN113828111B (zh) * 2021-09-02 2023-02-24 中国华能集团有限公司 具有分布器的移动床吸附塔和烟气净化系统
CN116351197B (zh) * 2023-06-01 2023-08-29 中国华能集团清洁能源技术研究院有限公司 烟气分布器、吸附塔和低温烟气吸附系统
CN117504841A (zh) * 2023-11-23 2024-02-06 华能山东发电有限公司 具有隔层空间的吸附剂再生塔及低温吸附再生系统
CN117282227B (zh) * 2023-11-23 2024-02-13 中国华能集团清洁能源技术研究院有限公司 具有烟气混合功能的低温烟气吸附塔及低温烟气吸附系统

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CN117282228A (zh) * 2023-11-23 2023-12-26 中国华能集团清洁能源技术研究院有限公司 具有烟气导流功能的低温烟气吸附塔和低温烟气吸附系统
CN117282228B (zh) * 2023-11-23 2024-03-08 中国华能集团清洁能源技术研究院有限公司 具有烟气导流功能的低温烟气吸附塔和低温烟气吸附系统
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