CAJ | 학술논문

随着烟气脱硝系统在火电厂的应用,对选择性催化还原催化剂的中毒机理和再生工艺的研究受到广泛关注.本文系统综述了脱硝催化剂的物理及化学中毒机制、再生方法及工艺.在中毒机制方面,将不同中毒机制归为三类:颗粒物或生成盐沉积在催化剂表面,堵塞催化剂通道和孔道;毒物与活性中心作用使表面的酸性性能和氧化还原性能降低;催化剂结构破坏和发生不可逆相变.在催化剂的再生方面,本文详细介绍了失活催化剂的再生工艺流程和再生液的选择,比较了不同再生技术的针对性和优缺点,最后介绍了电厂高钙项目的再生工业示范,其再生催化剂的相对活性恢复到原来的 0.96,SO2氧化率为 1.0%,且各项指标达到了新鲜催化剂的水平.本文对延长催化剂使用寿命和制定废弃催化剂再生工艺具有重要指导意义.
수착연기탈초계통재화전엄적응용,대선택성최화환원최화제적중독궤리화재생공예적연구수도엄범관주.본문계통종술료탈초최화제적물리급화학중독궤제、재생방법급공예.재중독궤제방면,장불동중독궤제귀위삼류:과립물혹생성염침적재최화제표면,도새최화제통도화공도;독물여활성중심작용사표면적산성성능화양화환원성능강저;최화제결구파배화발생불가역상변.재최화제적재생방면,본문상세개소료실활최화제적재생공예류정화재생액적선택,비교료불동재생기술적침대성화우결점,최후개소료전엄고개항목적재생공업시범,기재생최화제적상대활성회복도원래적 0.96,SO2양화솔위 1.0%,차각항지표체도료신선최화제적수평.본문대연장최화제사용수명화제정폐기최화제재생공예구유중요지도의의.
As selective catalytic reduction is widely used for eliminating NOx in thermal power plant, researches on poisoning mechanism and regeneration process of the denitration catalyst have drawn more and more attention. This paper makes a systematic review on the physical and chemical poisoning mechanism and regeneration process of the denitration catalyst. The poisoning mechanism can be summarized into three categories:the deposition of particles or created salts on the surface of the catalyst which blocks the pores on the catalyst; the reaction between poisons and the active site which reduces the acidity and redox performance of the surface; structural damage and irreversible phase transition of the catalyst. As for the regeneration of the catalyst,this paper gives a detailed description of the regeneration process,compares advantages and disadvantages among different regeneration technologies and introduces a demonstration project of the high-calcium catalyst regeneration. In the project,the relative activity of the regenerated catalyst,compared to fresh catalyst,was recovered to 0.96. Moreover,only 1.0% SO2 was oxidized and each quality index of the regenerated catalyst reaches the level of the fresh catalyst. This paper is important for extending catalyst's lifespan and developing its regeneration technologies through in-depth discussion about poisoning mechanism and regeneration process.