1、燃煤电厂 SCR 脱硝工艺的设计 I 摘摘 要要 我国是能源生产与消费的大国,一次能源供应以煤炭为主,石油、天然气资源 短缺。然而我国污染物排放总量长期居高不下,远远超过环境自净能力。其中,氮 氧化物的污染不断加剧,特别是北京、上海、广州等一些大城市,氮氧化物含量超 标。 SCR工艺与其它工艺相比,具有较高的NOX脱除率(80%以上),将燃煤电厂 烟气排放NOX控制在较低的浓度,以满足不断更新的更加严格的排放标准。而且该 工艺无副产物,不形成二次污染,装置结构简单,运营可靠,便于维护。 本设计针对电厂燃煤锅炉产生烟气的排放要求和一些工程实例,对SCR系统的 工艺结构进行了设计计算,并对催化剂及
2、辅助设备进行了选型。 关键词:关键词:氮氧化物,SCR工艺,催化剂,结构设计 燃煤电厂 SCR 脱硝工艺的设计 II Abstract Our country is the energy production and the expense great nation, an energy supply by the coal, the petroleum, and the natural gas resource is primarily short. Therefore our country pollutant discharge total quantity stays at a hig
3、h level for a long time, goes far beyond the environment automatic depuration ability. The nitrogen oxide pollution intensifies unceasingly, nitrogen oxide content exceeding the allowed figure specially Beijing, Shanghai, Guangzhou and other some big cities. The SCR craft compares with other crafts,
4、 has the high NOX removing rate (above 80%), will burn coal the power plant haze to discharge the NOX control in the low density, and satisfies the stricter emission standard which renews unceasingly. Moreover this craft does not have the by-product, does not form secondary pollution, the installmen
5、t structure is simple, the operation is reliable, is advantageous for the maintenance. This design has the haze nature and the emissions request in view of the power plant coal-fired boiler, has carried on the design calculation to the SCR system equipments structure, and carries on the shaping to t
6、he catalyst and the supporting facility. Key words:Nitrogen oxide, SCR process, catalyst, structural design 燃煤电厂 SCR 脱硝工艺的设计 III 目 录 摘 要 . I ABSTRACT II 第一章 前 言 . 1 1.1 综述 1 1.1.1 选题背景 . 1 1.1.2 研究意义 . 1 1.2 NOX的特性、来源和危害 2 1.2.1 NOx的特性 2 1.2.2 NOx的来源 2 1.2.3 NOx的危害 3 1.2.4 燃煤电站 NOX的产生 . 5 1.3 环保政策法规 5 1.4 NOX污染的治理 6 1.4.1 我国燃煤 NOx排放现状. 6 1.4.2 常规处理 . 6 1.4.3 燃烧后控制 . 8 1.5 SCR 脱硝工艺 . 11 1.5.1 SCR 基本原理 . 11 1.5.2 典型 SCR 系统组成 13 1.5.3 SCR 工艺流程 . 13 1.5.4 SCR 工艺系统布置分类 . 14 1.6 催化剂 . 16 1.7 还