WO2018120052A1 - 一种垃圾焚烧炉两段式烟气净化系统 - Google Patents

一种垃圾焚烧炉两段式烟气净化系统 Download PDF

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Publication number
WO2018120052A1
WO2018120052A1 PCT/CN2016/113580 CN2016113580W WO2018120052A1 WO 2018120052 A1 WO2018120052 A1 WO 2018120052A1 CN 2016113580 W CN2016113580 W CN 2016113580W WO 2018120052 A1 WO2018120052 A1 WO 2018120052A1
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flue gas
scr
activated carbon
sodium bicarbonate
bag filter
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PCT/CN2016/113580
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English (en)
French (fr)
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张辉
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深圳市能源环保有限公司
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Priority to PCT/CN2016/113580 priority Critical patent/WO2018120052A1/zh
Publication of WO2018120052A1 publication Critical patent/WO2018120052A1/zh

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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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes

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  • the invention relates to a waste gas incinerator flue gas purification device, in particular to a two-stage flue gas purification system for a garbage incinerator.
  • the waste gas incineration plant incinerator flue gas treatment system is a selective non-catalytic reduction method in the furnace to remove nitrogen oxides (NOx) from the flue gas, and then removes the flue gas by a semi-dry method and an activated carbon spray plus bag filter.
  • NOx nitrogen oxides
  • Other harmful substances such as particulate matter, sulfur oxides (SOx), dioxins, and heavy metals.
  • the existing waste gas incineration power plant flue gas treatment system can not meet the requirements of laws and regulations, and it is necessary to install a selective catalytic reducer on the flue gas pipeline outside the furnace ( SCR), further denitrification of the flue gas to better meet emission standards.
  • SCR selective catalytic reducer
  • the SCR is installed at the tail of the flue gas purification system.
  • the problem is that since the operating temperature of the SCR is about 200 °C, and the temperature of the flue gas flowing out from the tail of the flue gas purification system is about 150 °C, it is necessary to arrange one or even more stages between the original flue gas aftertreatment system and the SCR.
  • the heater heats the flue gas, so that the original 150 ° C flue gas rises to 200 ° C before flowing into the SCR to meet the requirements of SCR work, but this will inevitably cause a large amount of heat loss and increase operating costs.
  • the present invention deacidizes by adding high-efficiency sodium bicarbonate dry method.
  • the dust removal system rearranges the SCR and the original flue gas treatment system, and sets the selective catalytic reduction device SCR after the first-stage bag filter to pass through the selective catalytic reduction device before the lime slurry preparation system and the semi-dry reaction column.
  • the SCR's flue gas temperature meets the requirements and meets the SCR working conditions, so there is no need to install a heat exchanger to save energy.
  • the technical solution adopted by the present invention to solve the technical problem is: a two-stage flue gas purification system for a garbage incinerator, characterized in that, according to the direction of the flow of the flue gas, the sodium bicarbonate dry deacidification system and hydrogencarbonate are sequentially used.
  • the sodium bicarbonate sprayed through the sodium bicarbonate injection system and the sodium bicarbonate nozzle is thoroughly mixed with the flue gas, and the flue gas flows through the first-stage high-temperature bag filter.
  • Most of the acid gases (mainly SOx), particulate matter and other solid materials in the flue gas are trapped by the bag. Because of the short flue gas stroke and no other heat loss, the flue gas is discharged from the first bag filter.
  • the temperature is still around 200 °C, fully meets the SCR inlet temperature condition, and since most of the particulate matter and acid gas in the flue gas have been removed, the operating conditions of the SCR have been established, and the selective catalytic reduction reaction of the flue gas in the SCR occurs. Further removal of NOx from the flue gas. After flowing out of the SCR, it enters the conventional semi-dry reaction tower (rotary sprayer), the lime slurry is thoroughly mixed with the flue gas, and then flows through the secondary bag filter to the SOx, particulate matter, and dioxins in the flue gas through the activated carbon injection system. Heavy metals and others The harmful substances are further removed.
  • the present invention provides a two-stage flue gas purification system for a garbage incinerator, which is disposed in the lime slurry preparation system and the semi-dry reaction tower after the selective catalytic reduction device SCR is disposed after the primary bag filter Since the temperature of the flue gas is not lowered, the SCR inlet temperature condition of the selective catalytic converter is completely satisfied.
  • the technical solution proposed by the present invention does not need to install a heat exchanger at the front end of the SCR, thereby reducing energy loss, and at the same time, due to lime
  • a secondary bag filter is arranged, so that the purification efficiency of the flue gas can be further improved, and the purpose of energy saving and high efficiency is achieved.
  • FIG. 1 is a layout of a device of an embodiment of the prior art.
  • FIG. 2 is a layout view of an apparatus for a two-stage flue gas purification system of a garbage incinerator installed in a flue gas pipeline of a garbage incinerator according to the present invention.
  • FIG. 1 is a layout of a device of an embodiment of the prior art.
  • the flue gas purification system installed in the flue gas pipeline of the garbage incinerator is sequentially prepared by the lime slurry preparation system according to the direction of the flue gas flow, and the semi-dry reaction tower (rotary atomizer).
  • the semi-dry reaction tower rotary atomizer.
  • Activated carbon storage and transportation system 7 activated carbon injection system 8, first-stage bag filter 3.1, heat exchanger 9, and selective catalytic reduction (SCR) 4.
  • the figure shows that the waste incinerator flue gas purification system needs to be equipped with a heat exchanger 9 at the front end of the selective catalytic reduction (SCR) 4, because Since the operating temperature of the SCR is about 200 ° C, when the flue gas of 200 ° C flows in from the flue gas duct 10.1 according to the direction of the flue gas flow into the 10.21, the semi-dry reaction tower 6 is passed through the rotary slurry of the lime slurry, and the lime slurry is thoroughly mixed with the flue gas. After passing through the activated carbon injection system 8, it is further filtered through the first-stage bag filter 3.1 to further remove SOx, particulate matter, dioxins, heavy metals and other harmful substances in the flue gas.
  • SCR selective catalytic reduction
  • the temperature of the flue gas has been greatly increased. Lowering, usually the temperature can only reach 140 °C, can not meet the SCR inlet operating temperature requirements, therefore, the heat exchanger 9 must be installed at the front end of the selective catalytic reduction (SCR) 4. But this will inevitably lead to heat loss and increase energy consumption.
  • SCR selective catalytic reduction
  • FIG. 2 is a layout view of an apparatus for a two-stage flue gas purification system of a garbage incinerator installed in a flue gas pipeline of a garbage incinerator according to the present invention.
  • a two-stage flue gas purification system for waste incinerator is characterized in that, according to the direction of flow of flue gas, sodium bicarbonate dry deacidification system 1 and sodium bicarbonate injection system 2 are sequentially , first-class bag filter 3.1, selective catalytic reduction (SCR) 4, lime slurry preparation system 5, semi-dry reaction tower (rotary atomizer) 6, activated carbon storage and delivery system 7, activated carbon storage injection system 8 and two
  • the grade bag filter is composed of 3.2.
  • the flue gas with a temperature of 200 °C flows out of the economizer, it flows through the sodium bicarbonate injection system 2.
  • the small sodium bicarbonate sprayed from the sodium bicarbonate nozzle mixes well with the flue gas, and the flue gas flows through the first-stage bag to remove dust.
  • most of the acid gases (mainly SOx), particulate matter and other solid materials in the flue gas are trapped by the primary bag. Due to the short stroke of the flue gas and no other heat loss, the primary bag filter 3.1 After the outflow, the temperature of the flue gas is still about 200 °C, which fully satisfies the SCR inlet temperature condition.
  • the operating conditions of the SCR are already available, and the flue gas is selectively selected in the SCR.
  • the catalytic reduction reaction further removes NOx from the flue gas.
  • SCR selective catalytic reduction device
  • the lime slurry is thoroughly mixed with the flue gas, and then flows through the activated carbon injection system 8 through the secondary bag filter 3.2 pairs. Further removal of SOx, particulate matter, dioxins, heavy metals and other harmful substances in the flue gas.
  • the selective catalytic reduction device SCR is disposed after the primary baghouse dust collector and before the lime slurry preparation system and the semi-dry reaction column, the temperature of the flue gas is not lowered, and the selective catalytic reduction is fully satisfied.
  • the SCR inlet temperature condition therefore, the technical solution proposed by the present invention does not need to install a heat exchanger at the front end of the SCR, thereby reducing energy loss, and at the same time, since a secondary bag filter is disposed after the semi-dry reaction tower, it can be further Improve the purification efficiency of flue gas to achieve energy saving and high efficiency.
  • the difference between this example and the prior art is that the prior art is to set the selective catalytic reduction device (SCR) 4 after the semi-dry reaction tower (rotary atomizer) 6, the activated carbon storage injection system 8 and the bag filter;
  • the solution proposed by the present invention is to set the selective catalytic reduction device (SCR) 4 in the semi-dry reaction tower (rotary atomizer) 6, the activated carbon storage injection system 8 and the bag filter, the biggest difference this time;
  • the flue gas stream is also passed through the sodium bicarbonate injection system 2 and the previous one before the selective catalytic reduction device (SCR) 4. Class bag filter.
  • sodium bicarbonate dry deacidification system 1 sodium bicarbonate injection system 2
  • primary bag filter 3.1 selective catalytic reduction (SCR) 4
  • lime slurry preparation system 5 semi-dry reaction
  • the tower (rotary atomizer) 6 the activated carbon storage and delivery system 7, the activated carbon storage injection system 8, and the heat exchanger 9 are all conventional equipments of the industry, and therefore need not be described in detail.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

一种垃圾焚烧炉两段式烟气净化系统，按照烟气流动的方向，依次由碳酸氢钠干法脱酸系统(1)、碳酸氢钠喷射系统(2)、一级布袋除尘器(3.1)、选择性催化还原器SCR(4)、石灰浆制备系统(5)、半干式反应塔(6)、活性炭存储输送系统(7)、活性炭存储喷射系统(8)以及二级布袋除尘器(3.2)组成。该系统不需要在SCR前端安装换热器，从而降低了能量损耗。

Description

一种垃圾焚烧炉两段式烟气净化系统 技术领域
本发明涉及一种垃圾焚烧炉烟气净化装置，尤其是涉及一种垃圾焚烧炉两段式烟气净化系统。
背景技术
目前，垃圾焚烧发电厂焚烧炉烟气处理系统是炉内选择性非催化还原法去除烟气中的氮氧化物(NOx)，然后通过半干法以及活性炭喷射加布袋除尘器去除烟气中的颗粒物、硫氧化物(SOx)、二恶英以及重金属等其它有害物质。
然而，随着环境保护相关法规的日益严格，现有的垃圾焚烧发电厂烟气处理系统已经不能很好的满足法律法规的要求，需要在炉外烟气管道上加装选择性催化还原器(SCR)，对烟气进行进一步脱硝才能更好的满足排放标准。由于现有SCR特性要求流入烟气温度在200℃左右，同时烟气中不能含有大量的硫、重金属，否则会引起催化剂中毒。为避免烟气中的有害成分对SCR的影响，现有技术中，SCR安装在烟气净化系统的尾部。
问题是，由于SCR的工作温度为200℃左右，而从烟气净化系统尾部流出的烟气温度多为150℃左右，因此需要在原烟气后处理系统与SCR之间布置一级甚至多级换热器加热烟气，使原本150℃的烟气在流入SCR之前升高至200℃，以满足SCR工作的要求，但这样势必造成大量的热量损耗，增加运营成本。
发明内容
为了解决现有垃圾焚烧炉烟气处理系统为了提高烟气温度、需要在尾部加装热交换器、导致热量损耗，增加能耗等问题，本发明通过加装高效碳酸氢钠干法脱酸、除尘系统，重新布置SCR和原烟气处理系统，将选择性催化还原器SCR设置在一级布袋除尘器之后而在石灰浆制备系统及半干式反应塔之前，使流经选择性催化还原器SCR的烟气温度符合要求，满足SCR工作条件，因此不需要安装换热器从而达到节约能量的目的。
本发明解决其技术问题所采用的技术方案是：一种垃圾焚烧炉两段式烟气净化系统，其特征是，按照烟气流动的方向，依次由碳酸氢钠干法脱酸系统、碳酸氢钠喷射系统、一级布袋除尘器、选择性催化还原器SCR、石灰浆制备系统、半干式反应塔(旋转雾化器)、活性炭存储输送系统、活性炭存储喷射系统以及二级布袋除尘器组成。当温度为200℃的烟气由省煤器流出后流经碳酸氢钠喷射系统、碳酸氢钠喷嘴喷出的碳酸氢钠与烟气充分混合，当烟气流经一级耐高温布袋除尘器时烟气中的大部分酸性气体(主要是SOx)、颗粒物及其它固态物质被布袋捕集，由于此过程烟气行程短且无其它热损失，因此由一级布袋除尘器流出后其烟气温度仍然为200℃左右，完全满足SCR入口温度条件，且由于烟气中的大部分颗粒物及酸性气体已被去除，已经具备了SCR的工作条件，烟气在SCR中发生选择性催化还原反应，对烟气中的NOx进行进一步脱除。由SCR流出后，进入常规半干式反应塔(旋转喷雾器)，石灰浆与烟气充分混合，而后经活性炭喷射系统再流经二级布袋除尘器对烟气中的SOx、颗粒物、二恶英、重金属及其它有 害物质进行进一步的脱除。
本发明的有益效果：本发明提供一种垃圾焚烧炉两段式烟气净化系统，由于选择性催化还原器SCR设置在一级布袋除尘器之后而在石灰浆制备系统及半干式反应塔之前，由于烟气的温度并没有降低，完全满足选择性催化还原器SCR入口温度条件，因此，本发明提出的技术方案不需要在SCR前端安装换热器，从而降低了能量损耗，同时，由于石灰浆制备系统及半干式反应塔之后设置二级布袋除尘器，因此可以进一步提高烟气的净化效率，达到节能高效的目的。
附图说明
图1为现有技术一个实施例的设备布置图。
图2为本发明提出的在垃圾焚烧炉烟气管道加装的一种垃圾焚烧炉两段式烟气净化系统一个实施例的设备布置图。
图中：
1.碳酸氢钠制备系统，
2.碳酸氢钠喷射系统，
3.1一级布袋除尘，3.2二级布袋除尘，
4.选择性催化还原器(SCR)，
5.石灰制备系统，
6.常规半干式反应塔(旋转雾化器)，
7.活性炭存储输送系统，
8.活性炭喷射系统，
9.换热器，
10.1烟气管道
10.21烟气流入方向，10.22烟气流出方向。
具体实施方式
图1为现有技术一个实施例的设备布置图。图中显示，现有技术中，在垃圾焚烧炉烟气管道加装的烟气净化系统，按照烟气流动的方向，依次由石灰浆制备系统5、半干式反应塔(旋转雾化器)6、活性炭存储输送系统7、活性炭喷射系统8、一级布袋除尘器3.1、换热器9、选择性催化还原器(SCR)4组成。图中显示，垃圾焚烧炉烟气净化系统，需要在选择性催化还原器(SCR)4前端加装换热器9，原因是， 由于SCR的工作温度为200℃左右，当200℃的烟气按照烟气流入方向10.21从烟气管道10.1流入后，进入半干式反应塔6通过石灰浆旋转喷雾器，石灰浆与烟气充分混合，而后经活性炭喷射系统8之后，再流经一级布袋除尘器3.1对烟气中的SOx、颗粒物、二恶英、重金属及其它有害物质进行进一步的脱除，此时烟气的温度已经大大降低，通常温度只能达到140℃，不能符合SCR入口工作温度的要求，因此，必须在选择性催化还原器(SCR)4的前端加装换热器9。但这样势必导致热量损耗，增加能耗。
图2为本发明提出的在垃圾焚烧炉烟气管道加装的一种垃圾焚烧炉两段式烟气净化系统一个实施例的设备布置图。图中显示，本例中，一种垃圾焚烧炉两段式烟气净化系统，其特征是，按照烟气流动的方向，依次由碳酸氢钠干法脱酸系统1、碳酸氢钠喷射系统2、一级布袋除尘器3.1、选择性催化还原器(SCR)4、石灰浆制备系统5、半干式反应塔(旋转雾化器)6、活性炭存储输送系统7、活性炭存储喷射系统8以及二级布袋除尘器3.2组成。当温度为200℃的烟气由省煤器流出后流经碳酸氢钠喷射系统2、碳酸氢钠喷嘴喷出的碳酸氢钠小晶体与烟气充分混合，当烟气流经一级布袋除尘器3.1时烟气中的大部分酸性气体(主要是SOx)、颗粒物及其它固态物质被一级布袋捕集，由于此过程烟气行程短且无其它热损失，因此由一级布袋除尘器3.1流出后烟气温度仍然为200℃左右，完全满足SCR入口温度条件，同时由于烟气中的大部分颗粒物及酸性气体已被去除，已经具备了SCR的工作条件，烟气在SCR中发生选择性催化还原反应，对烟气中的NOx进行进一步脱除。由选择性催化还原器(SCR)4流出后，进入常规半干式反应塔(旋转喷雾器)6，石灰浆与烟气充分混合，而后经活性炭喷射系统8再流经二级布袋除尘器3.2对烟气中的SOx、颗粒物、二恶英、重金属及其它有害物质进行进一步的脱除。本例中，由于选择性催化还原器SCR设置在一级布袋除尘器之后而且是在石灰浆制备系统及半干式反应塔之前，因此，烟气的温度并没有降低，完全满足选择性催化还原器SCR入口温度条件，因此，本发明提出的技术方案不需要在SCR前端安装换热器，从而降低了能量损耗，同时，由于在半干式反应塔之后设置二级布袋除尘器，因此可以进一步提高烟气的净化效率，达到节能高效的目的。本例与现有技术的区别在于，现有技术是将选择性催化还原器(SCR)4设置在半干式反应塔(旋转雾化器)6、活性炭存储喷射系统8以及布袋除尘器之后；而本发明提出的方案是将将选择性催化还原器(SCR)4设置在半干式反应塔(旋转雾化器)6、活性炭存储喷射系统8以及布袋除尘器之前，这次最大区别；另外，本发明中，为了确保烟气进入选择性催化还原器(SCR)4之前符合入口条件，在选择性催化还原器(SCR)4之前还使烟气流经碳酸氢钠喷射系统2和前一级的布袋除尘器。
在本发明中，由于碳酸氢钠干法脱酸系统1、碳酸氢钠喷射系统2、一级布袋除尘器3.1、选择性催化还原器(SCR)4、石灰浆制备系统5、半干式反应塔(旋转雾化器)6、活性炭存储输送系统7、活性炭存储喷射系统8、换热器9等都属于行业常规设备，因此不需要再做详细说明。

Claims (1)

  1. 一种垃圾焚烧炉两段式烟气净化系统，其特征是，按照烟气流动的方向，依次由碳酸氢钠干法脱酸系统、碳酸氢钠喷射系统、一级布袋除尘器、选择性催化还原器SCR、石灰浆制备系统、半干式反应塔、活性炭存储输送系统、活性炭存储喷射系统以及二级布袋除尘器组成。
PCT/CN2016/113580 2016-12-30 2016-12-30 一种垃圾焚烧炉两段式烟气净化系统 WO2018120052A1 (zh)

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CN108686476A (zh) * 2018-07-13 2018-10-23 天津水泥工业设计研究院有限公司 一种水泥行业除尘脱硝工艺、设备及其改造方法
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