SCR脱硝系统精准喷氨优化技术分析

doi:10.12096/j.2096-4528.pgt.20035

摘要/Abstract

摘要：

为提高选择性催化还原（selective catalytic reduction，SCR）脱硝系统的运行水平，通过分析现有SCR脱硝控制系统的技术特点发现，测试仪表的滞后性是影响脱硝喷氨控制准确性和实时性的直接因素。为此，提出了脱硝系统精准喷氨的优化控制技术，将喷氨总量控制、分区喷氨控制和NO_x浓度场精准测量等技术有机结合，构建以总量控制、分区喷氨调整、NO_x浓度场精准测量前馈为主要手段的精准喷氨控制策略，从而提高喷氨控制的准确性和实时性，进一步降低脱硝系统的运行成本，减小氨逃逸的影响，为下一步精准喷氨优化技术的应用提供技术支撑。

关键词: 选择性催化还原(SCR), 总量控制, 精准喷氨, 控制策略

Abstract:

In order to improve the operation level of selective catalytic reduction (SCR) denitration system, through the analysis of the technical characteristics of the existing control system of SCR denitration, it was found that the delay of existing test instruments is the direct factor affecting the accuracy and real-time performance of the denitration ammonia injection control. To improve the accuracy and real-time performance of ammonia injection control, the optimization control technology of precise ammonia injection in denitration system was proposed. Moreover, the technologies of the total amount control of ammonia injection, divisional ammonia injection control and precise measurement of NO_x concentration field were organically combined to build a precise ammonia injection control strategy with total amount control, subarea ammonia injection adjustment and NO_x concentration field precise measurement feedforward as the main means. This work is benefit to reduce the operation cost of denitration system and weaken the impact of escaping ammonia, and provides the technical support for the application of the next precise ammonia injection optimization technology.

Key words: selective catalytic reduction (SCR), total amount control, precise ammonia injection, control strategy

中图分类号:

TK47

李子尚, 朱仁涵, 杜振. SCR脱硝系统精准喷氨优化技术分析[J]. 发电技术, 2021, 42(5): 630-636.

Zishang LI, Renhan ZHU, Zhen DU. Analysis on the Optimization Technology of Precise Ammonia Injection in SCR Denitration System[J]. Power Generation Technology, 2021, 42(5): 630-636.

图/表 8

图1 固定摩尔比控制方式原理图

Fig.1 Schematic diagram of fixed mole ratio control

图2 出口NOx定值控制方式原理图

Fig.2 Schematic diagram of outlet NOx setting control mode

图3 喷氨总量控制示意图

Fig.3 Schematic diagram of total ammonia injection control

图4 分区喷氨示意图

Fig.4 Schematic diagram of partition ammonia injection

图5 分区轮测采样流程图

Fig.5 Flow chart of sampling by zone rotation

图6 直插式原位测量示意图

Fig.6 Flow chart of direct insertion in-situ measurement

图7 基于惯性基控制示意图

Fig.7 Control diagram based on inertia base

图8 基于出口NOx前馈的控制示意图

Fig.8 Control diagram based on outlet NOx feedforward

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