WO2021016825A1 - Waste incinerator flue gas dry deacidification treatment system - Google Patents

Waste incinerator flue gas dry deacidification treatment system Download PDF

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WO2021016825A1
WO2021016825A1 PCT/CN2019/098249 CN2019098249W WO2021016825A1 WO 2021016825 A1 WO2021016825 A1 WO 2021016825A1 CN 2019098249 W CN2019098249 W CN 2019098249W WO 2021016825 A1 WO2021016825 A1 WO 2021016825A1
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flue gas
dry
sodium bicarbonate
flue
heat exchanger
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PCT/CN2019/098249
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French (fr)
Chinese (zh)
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孔华
王炜
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深圳市能源环保有限公司
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Publication of WO2021016825A1 publication Critical patent/WO2021016825A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/38Removing components of undefined structure
    • B01D53/40Acidic components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75Multi-step processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80Semi-solid phase processes, i.e. by using slurries
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes

Abstract

A waste incinerator flue gas dry deacidification treatment system, consisting sequentially of a semi-dry reaction tower, a baghouse filter, a flue gas/flue gas heat exchanger, a steam/flue gas heat exchanger, an SCR reactor, an induced draft fan, and a chimney according to the direction in which flue gas flows. An activated carbon flue injection apparatus is provided before the baghouse filter. Steam is introduced for heating before the steam/flue gas heat exchanger and condensed water generated is drained away. Ammonia is introduced before the SCR reactor. A sodium bicarbonate dry reactor is provided before the baghouse filter. Also, a sodium bicarbonate flue injection apparatus is provided before the activated carbon flue injection apparatus.

Description

一种垃圾焚烧炉烟气干法脱酸处理系统Dry deacidification treatment system for flue gas of garbage incinerator 技术领域Technical field
本发明涉及一种垃圾焚烧炉烟气处理系统,尤其涉及一种垃圾焚烧炉烟气干法脱酸处理系统。The invention relates to a waste incinerator flue gas treatment system, in particular to a waste incinerator flue gas dry deacidification treatment system.
背景技术Background technique
为了应对越来越严格的环保要求,我国现有许多生活垃圾焚烧项目烟气净化系统的技术方案是:半干式反应塔(吸收剂为氢氧化钙)+活性炭烟道喷射吸附+袋式除尘器+#1烟气/烟气换热器+湿法洗涤塔+#2烟气/烟气换热器+蒸汽/烟气换热器+SCR反应器。该方案也称为湿法脱酸法。该工艺能大大降低烟气中污染物的排放浓度,满足比欧盟最新标准更严的要求。In order to cope with increasingly strict environmental protection requirements, the technical solutions of many domestic waste incineration projects in my country are: semi-dry reaction tower (absorbent is calcium hydroxide) + activated carbon flue injection adsorption + bag dust removal +#1 flue gas/flue gas heat exchanger+wet scrubber+#2 flue gas/flue gas heat exchanger+steam/flue gas heat exchanger+SCR reactor. This scheme is also called wet deacidification. This process can greatly reduce the emission concentration of pollutants in the flue gas and meet the stricter requirements than the latest EU standards.
问题是,湿法脱酸法投资运行费用很高,而且需要在其前后增加换热器,极大的增加了项目的用地面积、建设投资和运行费用。The problem is that the investment and operation cost of the wet deacidification method is very high, and it is necessary to add heat exchangers before and after it, which greatly increases the project's land area, construction investment and operating costs.
发明内容Summary of the invention
为了解决现有问题,本发明提供了一种垃圾焚烧炉烟气干法脱酸处理系统,去除湿法洗涤塔,在袋式除尘器的前面设置碳酸氢钠干法反应器。相比于湿法脱酸法,工艺流程大大简化,不产生脱酸废水;由于半干式反应塔后没有其他降温环节,故其反应温度较高,将烟气加热到SCR反应需要的温度消耗能量较少,从而大大降低了投资和运行成本,可以有效解决现有技术问题。In order to solve the existing problems, the present invention provides a waste incinerator flue gas dry deacidification treatment system, which removes the wet scrubber, and installs a sodium bicarbonate dry reactor in front of the bag filter. Compared with the wet deacidification method, the process flow is greatly simplified, and no deacidification wastewater is produced; since there is no other cooling step after the semi-dry reaction tower, the reaction temperature is higher, and the flue gas is heated to the temperature required for the SCR reaction. Less energy, which greatly reduces investment and operating costs, and can effectively solve the existing technical problems.
本发明解决技术问题采用的技术方案是,一种垃圾焚烧炉烟气干法脱酸处理系统,按照烟气的流动方向,依次由半干式反应塔、袋式除尘器、烟气/烟气换热器、蒸汽/烟气换热器、SCR反应器、引风机及烟囱组成,在所述袋式除尘器之前设置活性炭烟道喷射装置,在所述蒸汽/烟气换热器之前通入蒸汽对烟气进行加热并将产生的冷凝水排走,在所述SCR反应器之前通入氨气,其特征是,在所述袋式除尘器的前面设置碳酸氢钠干法反应器,在所述活性炭烟道喷射装置之前还设置碳酸氢钠烟道喷射装置。The technical solution adopted by the present invention to solve the technical problem is a dry deacidification treatment system for waste incinerator flue gas. According to the flow direction of the flue gas, it consists of a semi-dry reaction tower, a bag filter, and flue gas/flue gas. It is composed of heat exchanger, steam/flue gas heat exchanger, SCR reactor, induced draft fan and chimney. An activated carbon flue injection device is arranged before the bag filter, and an activated carbon flue injection device is provided before the steam/flue gas heat exchanger. The steam heats the flue gas and discharges the condensed water produced. Ammonia gas is introduced before the SCR reactor. The characteristic is that a sodium bicarbonate dry reactor is installed in front of the bag filter. A sodium bicarbonate flue injection device is also arranged before the activated carbon flue injection device.
烟气从余热锅炉流出后,进入半干式反应塔进行脱酸,半干式反应塔出来的烟气进入碳酸氢钠干法反应器,与在此处喷入的碳酸氢钠吸收剂和活性炭充分混合,利用碳酸氢钠的特性以及反应塔内充分的反应时间进一步降低烟气中酸性污染物,随后烟气经过袋式除尘器,在滤袋表面进一步脱除烟气中的酸性污染物、重金属、二噁英以及颗粒物,最后烟气经过换热器达到SCR反应温度脱除氮氧化物后通过烟囱排入大气。After the flue gas flows out of the waste heat boiler, it enters the semi-dry reaction tower for deacidification. The flue gas from the semi-dry reaction tower enters the sodium bicarbonate dry reactor, where it is sprayed with sodium bicarbonate absorbent and activated carbon. Fully mixing, using the characteristics of sodium bicarbonate and the sufficient reaction time in the reaction tower to further reduce the acidic pollutants in the flue gas, and then the flue gas passes through the bag filter to further remove the acidic pollutants in the flue gas on the surface of the filter bag. Heavy metals, dioxins and particulate matter, and finally the flue gas reaches the SCR reaction temperature through a heat exchanger to remove nitrogen oxides and is discharged into the atmosphere through the chimney.
本发明的有益效果:本发明提供了一种垃圾焚烧炉烟气干法脱酸处理系统,去除湿法洗涤塔,在袋式除尘器的前面设置碳酸氢钠干法反应器。余热锅炉出口的烟气进入半干式反应塔中脱除大部分酸性气体后再进入碳酸氢钠干法反应器,该反应器为烟气与碳酸氢钠吸收剂的反应以及活性炭的吸附提供了足够的时间和空间,且其中烟气温度为碳酸氢钠与酸性污染物的适宜反应温度,确保了使用较少的碳酸氢钠吸收剂达到很好的脱酸效果,同时有利于提高活性炭的吸附效率;相比于湿法脱酸,工艺流程大大简化,不产生脱酸废水;由于半干式反应塔后没有其他降温环节,故其反应温度较高,将烟气加热到SCR反应需 要的温度消耗能量较少,从而大大降低了投资和运行成本。The beneficial effects of the present invention: The present invention provides a waste incinerator flue gas dry deacidification treatment system, which removes the wet scrubber, and installs a sodium bicarbonate dry reactor in front of the bag filter. The flue gas at the outlet of the waste heat boiler enters the semi-dry reaction tower to remove most of the acid gas and then enters the sodium bicarbonate dry reactor. The reactor provides the reaction of the flue gas with the sodium bicarbonate absorbent and the adsorption of activated carbon Sufficient time and space, and the flue gas temperature is the appropriate reaction temperature of sodium bicarbonate and acidic pollutants, which ensures that less sodium bicarbonate absorbent is used to achieve a good deacidification effect, and at the same time helps to improve the adsorption of activated carbon Efficiency; Compared with wet deacidification, the process flow is greatly simplified, and no deacidification wastewater is generated; since there is no other cooling step after the semi-dry reaction tower, the reaction temperature is higher, and the flue gas is heated to the temperature required for the SCR reaction It consumes less energy, thereby greatly reducing investment and operating costs.
附图说明Description of the drawings
图1为现有技术一个实施例的设备布置示意图。Fig. 1 is a schematic diagram of an arrangement of equipment in an embodiment of the prior art.
图2为本发明提出的一个实施例的设备布置示意图。Fig. 2 is a schematic diagram of the device layout according to an embodiment of the present invention.
具体实施方式Detailed ways
图1为现有技术一个实施例的设备布置示意图。图中显示,现有技术中,垃圾焚烧项目烟气净化系统采用半干式反应塔(吸收剂为氢氧化钙)+活性炭烟道喷射吸附+袋式除尘器+第1烟气/烟气换热器+湿法洗涤塔+第2烟气/烟气换热器+蒸汽/烟气换热器+SCR”的组合工艺系统,该工艺能大大降低烟气中污染物的排放浓度,满足比欧盟最新标准更严的要求。但是,湿法脱酸投资运行费用很高,而且需要在其前后增加换热器,极大的增加了项目的用地面积、建设投资和运行费用。Fig. 1 is a schematic diagram of an arrangement of equipment in an embodiment of the prior art. The figure shows that in the prior art, the flue gas purification system of waste incineration projects adopts a semi-dry reaction tower (absorbent is calcium hydroxide) + activated carbon flue injection adsorption + bag filter + first flue gas/flue gas exchange Heater + wet scrubber + second flue gas/flue gas heat exchanger + steam/flue gas heat exchanger + SCR" combined process system. This process can greatly reduce the emission concentration of pollutants in flue gas and meet the requirements The latest EU standards have more stringent requirements. However, the investment and operation cost of wet deacidification is very high, and heat exchangers need to be added before and after it, which greatly increases the project’s land area, construction investment and operating costs.
图2为本发明提出的一个实施例的设备布置示意图。图中显示,本例中,一种垃圾焚烧炉烟气干法脱酸处理系统,按照烟气的流动方向,依次由半干式反应塔、袋式除尘器、烟气/烟气换热器、蒸汽/烟气换热器、SCR反应器、引风机及烟囱组成,袋式除尘器之前设置活性炭烟道喷射装置,在蒸汽/烟气换热器之前通入蒸汽对烟气进行加热并将产生的冷凝水排走,在SCR反应器之前通入氨气。与现有技术不同的是,本例中,没有设置湿法洗涤塔,而是在袋式除尘器的前面设置碳酸氢钠干法反应器,在活性炭烟道喷射吸附之前还设置碳酸氢钠烟道喷射装置。Fig. 2 is a schematic diagram of the device layout according to an embodiment of the present invention. The figure shows that in this example, a waste incinerator flue gas dry deacidification treatment system consists of a semi-dry reaction tower, a bag filter, and a flue gas/flue gas heat exchanger according to the flow direction of the flue gas. , Steam/flue gas heat exchanger, SCR reactor, induced draft fan and chimney, the activated carbon flue injection device is set before the bag filter, and steam is introduced before the steam/flue gas heat exchanger to heat the flue gas and The produced condensate is drained away, and ammonia gas is introduced before the SCR reactor. The difference from the prior art is that in this example, there is no wet scrubber, but a sodium bicarbonate dry reactor is installed in front of the bag filter, and sodium bicarbonate smoke is also installed before the activated carbon flue is injected and absorbed. Road injection device.
烟气从余热锅炉流出后,进入半干式反应塔进行脱酸,半干式反应塔出来的烟气进入碳酸氢钠干法反应器,与在此处喷入的碳酸氢钠吸收剂和活性炭充分混合,利用碳酸氢钠的特性以及反应塔内充分的反应时间进一步降低烟气中酸性污染物,随后烟气经过袋式除尘器,在滤袋表面进一步脱除烟气中的酸性污染物、重金属、二噁英以及颗粒物,最后烟气经过换热器达到SCR反应温度脱除氮氧化物后通过烟囱排入大气。After the flue gas flows out of the waste heat boiler, it enters the semi-dry reaction tower for deacidification. The flue gas from the semi-dry reaction tower enters the sodium bicarbonate dry reactor, where it is sprayed with sodium bicarbonate absorbent and activated carbon. Fully mixing, using the characteristics of sodium bicarbonate and the sufficient reaction time in the reaction tower to further reduce the acidic pollutants in the flue gas, and then the flue gas passes through the bag filter to further remove the acidic pollutants in the flue gas on the surface of the filter bag. Heavy metals, dioxins and particulate matter, and finally the flue gas reaches the SCR reaction temperature through a heat exchanger to remove nitrogen oxides and is discharged into the atmosphere through the chimney.
与现有技术相对比,本例中,余热锅炉出口的烟气进入半干式反应塔中脱除大部分酸性气体后再进入碳酸氢钠干法反应器,该反应器为烟气与碳酸氢钠吸收剂的反应以及活性炭的吸附提供了足够的时间和空间,且其中烟气温度为碳酸氢钠与酸性污染物的适宜反应温度,确保了使用较少的碳酸氢钠吸收剂达到很好的脱酸效果,同时有利于提高活性炭的吸附效率;相比于湿法脱酸,工艺流程大大简化,不产生脱酸废水;由于半干式反应塔后没有其他降温环节,故其反应温度较高,将烟气加热到SCR反应需要的温度消耗能量较少,从而大大降低了投资和运行成本。Compared with the prior art, in this example, the flue gas at the outlet of the waste heat boiler enters the semi-dry reaction tower to remove most of the acid gas and then enters the sodium bicarbonate dry reactor, which is composed of flue gas and hydrogen carbonate. The reaction of the sodium absorbent and the adsorption of activated carbon provide sufficient time and space, and the flue gas temperature is the appropriate reaction temperature of sodium bicarbonate and acidic pollutants, ensuring that less sodium bicarbonate absorbent is used to achieve good results The deacidification effect is also conducive to improving the adsorption efficiency of activated carbon. Compared with wet deacidification, the process flow is greatly simplified and no deacidification wastewater is produced. Since there is no other cooling step after the semi-dry reaction tower, the reaction temperature is higher. , Heating the flue gas to the temperature required for the SCR reaction consumes less energy, thereby greatly reducing investment and operating costs.

Claims (1)

  1. 一种垃圾焚烧炉烟气干法脱酸处理系统,按照烟气的流动方向,依次由半干式反应塔、袋式除尘器、烟气/烟气换热器、蒸汽/烟气换热器、SCR反应器、引风机及烟囱组成,在所述袋式除尘器之前设置活性炭烟道喷射装置,在所述蒸汽/烟气换热器之前通入蒸汽对烟气进行加热并将产生的冷凝水排走,在所述SCR反应器之前通入氨气,其特征是,在所述袋式除尘器的前面设置碳酸氢钠干法反应器,在活性炭烟道喷射装置之前还设置碳酸氢钠烟道喷射装置,A waste incinerator flue gas dry deacidification treatment system. According to the flow direction of the flue gas, it consists of a semi-dry reaction tower, a bag filter, a flue gas/flue gas heat exchanger, and a steam/flue gas heat exchanger. , SCR reactor, induced draft fan and chimney, an activated carbon flue injection device is installed before the bag filter, and steam is introduced before the steam/flue gas heat exchanger to heat the flue gas and condense the produced The water is drained, and ammonia gas is introduced before the SCR reactor. The feature is that a sodium bicarbonate dry process reactor is installed in front of the bag filter, and sodium bicarbonate is also installed before the activated carbon flue injection device Flue injection device,
    烟气从余热锅炉流出后,进入半干式反应塔进行脱酸,半干式反应塔出来的烟气进入碳酸氢钠干法反应器,与在此处喷入的碳酸氢钠吸收剂和活性炭充分混合,利用碳酸氢钠的特性以及反应塔内充分的反应时间进一步降低烟气中酸性污染物,随后烟气经过袋式除尘器,在滤袋表面进一步脱除烟气中的酸性污染物、重金属、二噁英以及颗粒物,最后烟气经过换热器达到SCR反应温度脱除氮氧化物后通过烟囱排入大气。After the flue gas flows out of the waste heat boiler, it enters the semi-dry reaction tower for deacidification. The flue gas from the semi-dry reaction tower enters the sodium bicarbonate dry reactor, where it is sprayed with sodium bicarbonate absorbent and activated carbon. Fully mixing, using the characteristics of sodium bicarbonate and the sufficient reaction time in the reaction tower to further reduce the acidic pollutants in the flue gas, and then the flue gas passes through the bag filter to further remove the acidic pollutants in the flue gas on the surface of the filter bag. Heavy metals, dioxins and particulate matter, and finally the flue gas reaches the SCR reaction temperature through a heat exchanger to remove nitrogen oxides and is discharged into the atmosphere through the chimney.
PCT/CN2019/098249 2019-07-29 2019-07-29 Waste incinerator flue gas dry deacidification treatment system WO2021016825A1 (en)

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