CN103877856B - 一种焦炉烟道废气余热利用与净化的方法 - Google Patents
一种焦炉烟道废气余热利用与净化的方法 Download PDFInfo
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- CN103877856B CN103877856B CN201410119747.9A CN201410119747A CN103877856B CN 103877856 B CN103877856 B CN 103877856B CN 201410119747 A CN201410119747 A CN 201410119747A CN 103877856 B CN103877856 B CN 103877856B
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- 239000002912 waste gases Substances 0.000 title claims abstract description 33
- 281000066869 Coke (fuel) companies 0.000 title claims abstract description 26
- 238000000746 purification Methods 0.000 title claims abstract description 8
- 239000000571 coke Substances 0.000 claims abstract description 45
- 239000007789 gases Substances 0.000 claims abstract description 36
- 239000003546 flue gases Substances 0.000 claims abstract description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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Abstract
本发明涉及焦炉烟道废气综合利用与污染治理技术领域，特别涉及一种焦炉烟道废气余热利用与净化的方法，其特征在于，利用烟道废气余热回收装置回收烟道废气余热，降低烟道废气的温度，利用焦炭具有的活性吸附能力和低温脱硝催化能力，实现烟道废气的脱硫、脱硝的一体化。与现有工艺相比，本发明的有益效果是：烟道废气脱硫脱硝在低温工况下进行，无需另设加热系统，降低了能源消耗；为了满足低温工况的脱硫脱硝，通过余热回收装置对烟道废气进行降温，使烟道废气的余热得到了充分利用；焦炭作为脱硫脱硝用主体催化剂为焦化厂自有，来源充足且无废弃损耗，本工艺可广泛应用于焦化生产企业焦炉加热烟道废气的污染治理和综合利用。
Description
技术领域
[0001] 本发明涉及焦炉烟道废气综合利用与污染治理技术领域，特别涉及一种焦炉烟道废气余热利用与净化的方法。
背景技术
[0002] 焦炉烟道废气为焦炉加热系统燃烧后的产物，温度在300°C以下，在烟囱根部的温度约为230〜280°C之间，废气含有大量热能，应该予以回收利用。同时，在焦炉加热燃料燃烧过程中，在高温状态下会生成对环境有害的NOx，因焦炉加热使用的燃料不同，废气中NOx的含量也有差异，但通常情况下废气中NOx的浓度都超过了国家相关标准规定的排放限值，需要对烟道废气中的NOx进行脱除，即脱硝处理。
[0003] 对于温度较低的烟气，烟气脱硝最普遍的做法是SCR (选择性催化还原法)法。在SCR工艺中，还原剂在催化剂的作用下将NOx还原为氮气和水，催化剂用于促进还原剂与NOx之间的化学反应，还原剂主要是用氨，一般在300°C以上能够实现较好的脱硝效果，因此对于低于300°C的烟气，需要增设烟气加热装置。在现有的焦炉烟道气脱硝实践中，采用的便是SCR法，用液氨作为还原剂，为了保证脱硝效果，另设燃气加热炉将烟道废气升温。因此，除SCR反应装置外，还要配套建设氨站、烟气加热系统、锅炉余热回收系统及GGH换热装置，导致整个系统庞大、投资高、能耗高。
发明内容
[0004] 本发明的目的是提供了一种焦炉烟道废气余热利用与净化的方法，利用焦炭的活性吸附能力和低温脱硝催化能力，使烟道废气的脱硫脱硝在低温工况下进行，构建一个独特的脱硫、脱硝一体化流程，回收烟道废气中的热量，实现烟道废气的污染治理和综合利用。
[0005] 为实现上述目的，本发明通过以下技术方案实现:
[0006] —种焦炉烟道废气余热利用与净化的方法，利用烟道废气余热回收装置回收烟道废气余热，降低烟道废气的温度，利用焦炭具有的活性吸附能力和低温脱硝催化能力，实现烟道废气的脱硫、脱硝的一体化，其具体操作步骤如下:
[0007] I)烟道废气先经过废气余热回收单元，烟道废气的余热被回收，温度降低到100°C〜150°C，随后进入低温SCR脱硫脱硝单元中，烟气中的302被焦炭吸附脱除，经过脱硫的烟气与氨气混合，以焦炭为SCR法的催化剂，发生脱硝还原反应，完成NOx的脱除；
[0008] 2)低温SCR脱硫脱硝单元中的焦炭供给来自于由提升机和水平刮板输送机组成的焦炭供给单元，脱硝还原反应后的焦炭排出至焦炭贮罐中，定时由外排车辆外送；
[0009] 3)低温SCR脱硫脱硝单元排出的烟气经烟气终净化单元除尘净化后送至烟囱，实现烟道废气的达标排放。
[0010] 所述废气余热回收单元中回收的余热送去蒸氨装置中，对焦化厂产生的剩余氨水进行蒸氨处理，为低温SCR脱硫脱硝单元中的脱硝还原反应提供必要的氨气。[0011 ] 与现有工艺相比，本发明的有益效果是:烟道废气脱硫脱硝在低温工况下进行，无需另设加热系统，降低了能源消耗；为了满足低温工况的脱硫脱硝，通过余热回收装置对烟道废气进行降温，使烟道废气的余热得到了充分利用；焦炭作为脱硫脱硝用主体催化剂为焦化厂自有，来源充足且无废弃损耗，实现了焦炉烟道废气的有效治理和综合利用，本工艺可广泛应用于焦化生产企业焦炉加热烟道废气的污染治理和综合利用。
附图说明
[0012] 图1是本发明实施例流程布置图。
[0013] 图中:1_废气余热回收单元2-低温SCR脱硫脱硝单元3-通风机组4_烟气终净化单元5-焦炭供给单元6-焦炭贮罐7-焦炉烟道8-烟囱9-焦炭外运车辆
具体实施方式
[0014] 下面结合附图对本发明的具体实施方式作进一步说明:
[0015] 见图1，是本发明一种焦炉烟道废气余热利用与净化系统实施例流程布置图，包括废气余热回收单元1、低温SCR脱硫脱硝单元2、通风机组3、焦炭供给单元5、烟气终净化单元4和焦炭排出单元6，焦炉烟道7经废气余热回收单元I与低温SCR脱硫脱硝单元2的烟气入口相连，外接的氨气管道与低温SCR脱硫脱硝单元2的进氨口相连；所述焦炭供给单元5包括提升机51和刮板输送机52，刮板输送机52的出料口与低温SCR脱硫脱硝单元2的催化剂入口相连，低温SCR脱硫脱硝单元2的卸料阀下方设有焦炭贮罐6，焦炭贮罐6与焦炭外运车辆9组成焦炭排出单元；低温SCR脱硫脱硝单元2的排烟口经烟气终净化单元4、通风机组3与烟囱8相连。
[0016] 废气余热回收单元I可以是单纯的废气余热回收装置，也可以是能够产生低温SCR脱硫脱硝所需要氨气的废气余热蒸氨装置。
[0017] 通风机组3与烟气终净化单元4相连，为烟道废气的净化和外排提供动力。
[0018] 低温SCR脱硫脱硝单元2和烟气终净化单元4可做成一体式的组合结构，能减少设备占地面积。
[0019] 本发明利用烟道废气余热回收装置回收烟道废气余热，降低烟道废气的温度，利用焦炭具有的活性吸附能力和低温脱硝催化能力，实现烟道废气的脱硫、脱硝的一体化，其具体操作步骤如下:
[0020] I)焦炉烟道废气首先经过废气余热回收单元，焦炉烟道废气经过废气余热回收单元I时温度被降低到100°C〜150°C，然后进入低温SCR脱硫脱硝单元中，烟道废气内的SO2被焦炭吸附而得到脱除，然后喷入氨气(氨气数量根据实际需要确定)，经过充分混合后，烟道废气内的NOx和氨气被吸附在焦炭的表面，在焦炭的催化作用下，NOx和氨气发生脱硝还原反应，完成NOx的脱除；
[0021] 2)低温SCR脱硫脱硝单元中的焦炭供给来自于由提升机52和水平刮板输送机51组成的焦炭供给单元5，脱硝还原反应后的焦炭排出至焦炭贮罐6中，定时由焦炭外运车辆9外送；
[0022] 3)低温SCR脱硫脱硝单元2排出的烟气经烟气终净化单元4除尘净化后送至烟囱8，实现烟道废气的达标排放。
Claims (1)
1.一种焦炉烟道废气余热利用与净化的方法，其特征在于，利用焦炉烟道废气余热利用与净化系统回收烟道废气余热，降低烟道废气的温度，利用焦炭具有的活性吸附能力和低温脱硝催化能力，实现烟道废气的脱硫、脱硝的一体化，其具体操作步骤如下: 1)烟道废气先经过废气余热回收单元，烟道废气的余热被回收，温度降低到100°c〜150°C，随后进入低温SCR脱硫脱硝单元中，烟气中的302被焦炭吸附脱除，经过脱硫的烟气与氨气混合，以焦炭为SCR法的催化剂，发生脱硝还原反应，完成NOx的脱除； 2)低温SCR脱硫脱硝单元中的焦炭供给来自于由提升机和水平刮板输送机组成的焦炭供给单元，脱硝还原反应后的焦炭排出至焦炭贮罐中，定时由外排车辆外送； 3)低温SCR脱硫脱硝单元排出的烟气经烟气终净化单元除尘净化后送至烟囱，实现烟道废气的达标排放； 所述废气余热回收单元中回收的余热送去蒸氨装置中，为低温SCR脱硫脱硝单元中的脱硝还原反应提供氨气； 所述的焦炉烟道废气余热利用与净化系统包括废气余热回收单元、低温SCR脱硫脱硝单元、通风机组、焦炭供给单元、烟气终净化单元和焦炭排出单元，焦炉烟道经废气余热回收单元与低温SCR脱硫脱硝单元的烟气入口相连，外接的氨气管道与低温SCR脱硫脱硝单元的进氨口相连；所述焦炭供给单元包括提升机和刮板输送机，刮板输送机的出料口与低温SCR脱硫脱硝单元的催化剂入口相连，低温SCR脱硫脱硝单元的卸料阀下方设有焦炭贮罐，焦炭贮罐与焦炭外运车辆组成焦炭排出单元；低温SCR脱硫脱硝单元的排烟口经烟气终净化单元、通风机组与烟囱相连。
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| CN104707454B (zh) * | 2015-03-27 | 2016-09-28 | 山东钢铁股份有限公司 | 塔式焦炉烟道气余热利用及同时脱硫脱硝系统 |
| CN105344236A (zh) * | 2015-11-13 | 2016-02-24 | 西南化工研究设计院有限公司 | 一种焦炉烟气脱硫脱硝除尘一体化工艺 |
| CN105944564A (zh) * | 2016-06-01 | 2016-09-21 | 中冶京诚工程技术有限公司 | 焦炉烟气余热回收利用、脱硫及脱硝一体化系统及方法 |
| CN106215693B (zh) * | 2016-08-31 | 2018-06-26 | 苏州贝捷环保设备有限公司 | 燃煤烟气处理用干式化学催化处理器 |
| TWI641693B (zh) * | 2018-02-07 | 2018-11-21 | 富利康科技股份有限公司 | Coke oven flue gas dedusting, desulfurization and denitration integrated method and equipment thereof |
| CN109529607A (zh) * | 2018-12-07 | 2019-03-29 | 山东洲蓝环保科技有限公司 | 球团烟气低温脱硫脱硝方法 |
| CN109513341A (zh) * | 2018-12-07 | 2019-03-26 | 山东洲蓝环保科技有限公司 | 球团烟气低温脱硫脱硝方法 |
| CN109513344A (zh) * | 2018-12-07 | 2019-03-26 | 山东洲蓝环保科技有限公司 | 烧结烟气低温脱硫脱硝方法 |
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| CN102658026A (zh) * | 2012-05-30 | 2012-09-12 | 西安交通大学 | 一种喷射生物质焦的脱硝系统 |
| CN103157371A (zh) * | 2011-12-15 | 2013-06-19 | 中国石油化工股份有限公司 | 一种用煤焦减少氮氧化合物排放的方法 |
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| CN103157371A (zh) * | 2011-12-15 | 2013-06-19 | 中国石油化工股份有限公司 | 一种用煤焦减少氮氧化合物排放的方法 |
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