CN207680333U - 尿素直喷型sncr+scr烟气脱硝系统 - Google Patents
尿素直喷型sncr+scr烟气脱硝系统 Download PDFInfo
- Publication number
- CN207680333U CN207680333U CN201720839720.6U CN201720839720U CN207680333U CN 207680333 U CN207680333 U CN 207680333U CN 201720839720 U CN201720839720 U CN 201720839720U CN 207680333 U CN207680333 U CN 207680333U
- Authority
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- Prior art keywords
- urea
- flue gas
- conveyance conduit
- liquid
- injection
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound 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NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 258
- 239000004202 carbamide Substances 0.000 title claims abstract description 129
- 239000003546 flue gas Substances 0.000 title claims abstract description 32
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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Abstract
本实用新型涉及一种尿素直喷型SNCR+SCR烟气脱硝系统。本实用新型，尿素喷枪安装于炉膛内，所述尿素喷射器组安装于转向室内，所述尿素溶液储罐与所述尿素喷射联箱之间通过所述输送泵和输送管路连接，所述空气压缩机与尿素喷射联箱之间通过所述压缩空气管路连接，所述尿素溶液储罐与所述尿素喷射器组之间通过所述输送泵和输送管路连接，所述本实用新型将尿素溶液喷入温度窗口适合的炉膛内，尿素溶液高温热解成氨气与烟气中的NOx进行非选择性氧化还原反应(SNCR)，同时将尿素溶液喷入转向室内，尿素溶液高温热解成氨气，在脱硝反应器中与烟气中的NOx进行选择性氧化还原反应(SCR)，可以有效去除烟气中的NOx，实现烟气脱硝。
Description
尿素直喷型SNCR+SCR烟气脱硝系统
技术领域
[0001]本实用新型涉及一种尿素直喷型SNCR+SCR烟气脱硝系统。
背景技术
[0002]随着环保要求的日益严格，燃煤电厂污染物排放标准一提再提，目前京津冀地区 的燃煤电厂的大气污染物排放浓度要求达到超低排放的要求。在脱硝工艺中，选择性催化 还原法(SCK)因结构简单、脱硝效率高、运行可靠、技术较成熟等优点在燃煤电厂广泛应用。 [0003] so?脱硝工艺的还原剂一般采用液氨或者尿素，目前由于考虑安全问题，在市区及 近郊禁止采用液氨，大多数采用尿素作为脱硝还原剂，通过热解或水解工艺生成氨气，喷入 SCR反应器进行反应，脱除烟气中的N0X。
[0004]与液氨相比，尿素热解系统具有耗电量大，喷枪易堵塞，管路易结晶堵塞等缺点， 尿素水解系统具有占地面积大，管路易结晶堵塞等缺点。
[000S]鉴于上述，本设计人积极加以研究创新，以期创设一种尿素直喷型SNCR+SCR烟气 脱硝系统，使其更具有产业上的利用价值。 实用新型内容
[0006]为解决上述技术问题，本实用新型的目的是提供一种能耗小、投资小、运行稳定、 不易结晶堵塞，从而达到脱硝系统安全稳定运行的目的的尿素直喷型SNCR+SCR烟气脱硝 系统。
[0007]本实用新型尿素直喷型SNCR+SCR烟气脱硝系统，包括:存储尿素溶液的尿素溶液 储罐，所述尿素溶液储罐连通两路尿素溶液输送管道，其分别为第一尿素溶液输送管道、第 二尿素溶液输送管道，所述第一尿素溶液输送管道连通尿素喷射联箱，所述第二尿素溶液 输送管道连通尿素喷射器组，其中，所述的第一尿素溶液输送管道、第二尿素溶液输送管道 上分别设有尿素溶液输送栗，所述尿素喷射联箱连通尿素喷枪，所述尿素喷枪设置在锅炉 炉膛内，所述尿素喷枪通过压缩空气管路连通空气压缩机，所述尿素喷射器组设置在转向 室内，所述转向室下游的烟道内依次设有静态混合器和SCR脱销反应器。
[0008] 进一步地，还包括存储尿素干粉的尿素粉仓，连接在尿素粉仓出料口处的出料器， 所述出料器通过管道与尿素溶解罐连通，所述尿素溶解罐连通所述尿素溶液储罐。
[0009] 进一步地，所述尿素喷射联箱安装有流量控制装置、压力控制装置、PLC控制装置， 所述PLC控制装置控制尿素溶液输送泵和所述空气压缩机。
[0010] 进一步地，尿素溶液储罐中，一路尿素溶液通过输送栗打入尿素喷射联箱，尿素溶 液在尿素喷枪中与压缩空气进行混合后喷入炉膛内与烟气中的N0X进行非选择性氧化还原 反应;另一路尿素溶液通过输送泵打入尿素喷射器组，尿素溶液通过尿素喷射器组喷入转 向室内进行热解反应生成氨气，氨气与烟气通过静态混合器充分混合后在脱硝反应器中与 烟气中的N0X进行选择性氧化还原反应，从而去除烟气中的N0X，实现脱硝。
[0011]与现有技术相比，本实用新型尿素直喷型SNCR+SCR烟气脱硝系统具有以下优点： L〇〇12」、本头用新型的尿素直喷型SNCR+SCR烟气脱硝系统，一部分尿素喷入炉膛内与烟气 中的N0X进行反应，一部分尿素喷入转向室内热解后与烟气中的.在脱硝反应器中反应，可 以有效脱除烟气中N0X，使烟气排放达到超低排放的标准要求，并且本技术具有节能、投资 少、运行稳定的优点。
[0013]上述说明仅是本实用新型技术方案的概述，为了能够更清楚了解本实用新型的技 术手段，并可依照说明书的内容予以实施，以下以本实用新型的较佳实施例并配合附图详 细说明如后。
附图说明
[0014]图1是本实用新型一种尿素直喷型SNCR+SCR烟气脱硝系统的结构示意图。
具体实施方式
[0015]下面结合附图和实施例，对本实用新型的具体实施方式作进一步详细描述。以下 实施例用于说明本实用新型，但不用来限制本实用新型的范围。
[0016]如图1所示，本实用新型尿素直喷型SNCR+SCR烟气脱硝系统的最佳实施例，包括： 存储尿素千粉的尿素粉仓1，连接在尿素粉仓出料口处的出料器16,所述出料器通过管道与 尿素溶解罐2连通，所述尿素溶解罐连通尿素溶液储罐3，所述尿素溶液储罐连通两路尿素 溶液输送管道5，其分别为第一尿素溶液输送管道、第二尿素溶液输送管道，所述第一尿素 溶液输送管道连通尿素喷射联箱6,所述第二尿素溶液输送管道连通尿素喷射器组10，其 中，所述的第一尿素溶液输送管道、第二尿素溶液输送管道上分别设有尿素溶液输送泵4， 所述尿素喷射联箱连通尿素喷枪7,所述尿素喷枪设置在锅炉炉膛11内，所述尿素喷枪通过 压缩空气管路9连通空气压缩机8,所述尿素喷射器组设置在转向室12内，所述转向室下游 的烟道13内依次设有静态混合器14和SCR脱销反应器15。
[0017]进一步地，本实施例中，所述尿素喷射联箱安装有流量控制装置、压力控制装置、 PLC控制装置，所述PLC控制装置控制尿素溶液输送泵和所述空气压缩机。
[0018]本实施例工作原理:通过尿素溶解罐将尿素粉仓出料的尿素干粉溶解为尿素溶液 并存入尿素溶液储罐中，一路尿素溶液通过输送泵打入尿素喷射联箱，尿素溶液在尿素喷 枪中与压缩空气进行混合后喷入炉膛内与烟气中的NOx进行非选择性氧化还原反应 (SNCR);另一路尿素溶液通过输送泵打入尿素喷射器组，尿素溶液通过尿素喷射器组喷入 转向室内进行热解反应生成氨气，氨气与烟气通过静态混合器充分混合后在脱硝反应器中 与烟气中的NOx进行选择性氧化还原反应(SCR)，从而去除烟气中的NOx，使处理后的烟气达 到超低排放的标准要求，实现脱硝。
[0019]以上所述仅是本实用新型的优选实施方式，并不用于限制本实用新型，应当指出， 对于本技术领域的普通技术人员来说，在不脱离本实用新型技术原理的前提下，还可以做 出若干改进和变型，这些改进和变型也应视为本实用新型的保护范围。
Claims (3)
- 种尿素直喷型SNCR+SCR烟气脱硝系统，其特征在于，包括:存储尿素溶液的尿素溶 f储罐，所述尿素溶液储罐连通两路尿素溶液输送管道，其分别为第一尿素溶液输送管道、 第二尿素溶液输送管道，所述第一尿素溶液输送管道连通尿素喷射联箱，所述第二尿素溶 液输送管道连通尿素喷射器组，其中，所述的第一尿素溶液输送管道、第二尿素溶液输送管 道上分别设有尿素溶液输送栗，所述尿素喷射联箱连通尿素喷枪，所述尿素喷枪设置在锅 炉炉膛内，所述尿素喷枪通过压缩空气管路连通空气压缩机，所述尿素喷射器组设置在转 向室内，所述转向室下游的烟道内依次设有静态混合器和SCR脱销反应器。
- 2.根据权利要求1所述的尿素直喷型SNCR+SCR烟气脱硝系统，其特征在于，还包括存储 尿素干粉的尿素粉仓，连接在尿素粉仓出料口处的出料器，所述出料器通过管道与尿素溶 解罐连通，所述尿素溶解罐连通所述尿素溶液储罐。
- 3.根据权利要求1所述的尿素直喷型SNCR+SCR烟气脱硝系统，其特征在于，所述尿素喷 射联箱安装有流量控制装置、压力控制装置、PLC控制装置，所述PLC控制装置控制尿素溶液 输送泵和所述空气压缩机。
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| CN112090254A (zh) * | 2020-09-18 | 2020-12-18 | 北京华电光大环境股份有限公司 | 燃油燃气锅炉pncr和低温scr联合脱硝系统及工艺 |
| CN112774431A (zh) * | 2019-11-01 | 2021-05-11 | 大唐国际发电股份有限公司陡河发电厂 | 火力发电厂脱硝系统投入操作方法 |
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| CN112774431A (zh) * | 2019-11-01 | 2021-05-11 | 大唐国际发电股份有限公司陡河发电厂 | 火力发电厂脱硝系统投入操作方法 |
| CN112774431B (zh) * | 2019-11-01 | 2022-05-24 | 大唐国际发电股份有限公司陡河发电厂 | 火力发电厂脱硝系统投入操作方法 |
| CN112090254A (zh) * | 2020-09-18 | 2020-12-18 | 北京华电光大环境股份有限公司 | 燃油燃气锅炉pncr和低温scr联合脱硝系统及工艺 |
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