System Overview

nThis system is designed forA distributed grid method NOX/O2 measurement system developed for the imbalance of flue gas concentration fields at the inlet and outlet of SCR denitrification devices. Measure the concentration of NOx and O2 in the flue gas before the ammonia spray grid of the SCR denitrification device and the flue gas at the catalyst outlet of the SCR denitrification device separately in a segmented and grid like manner, to solve the problem of non representativeness of the single point CESM measurement system at the inlet and outlet of the SCR denitrification device.

answerGrid measurement of the concentration field of flue gas at the SCR inlet flue section can predict whether the concentration field of flue gas discharged from the boiler is uniform; Grid measurement of the concentration field of flue gas in the SCR outlet flue section can provide a visual judgmentDifferent regions have differentNH3/NOx molar ratioThe activity of the catalyst area and the blockage of the catalyst area. This system can be used to manually adjust the opening of the manual valve of the ammonia injection main pipe to achieve the purpose of manual optimization of ammonia injection. It can also be equipped with automatic regulating valves and external intelligent ammonia injection controllers to achieve the purpose of automatic intelligent optimization of ammonia injection.

This system adopts our company's patented technologyThe ZN-NOX direct insertion type nitrogen oxide detection probe is directly inserted into the high-temperature flue to continuously measure NOX/O2 in the flue gas online. This probe is based on the principle of semiconductor ceramics and can work directly in an atmosphere with high temperature and high dust, with a reaction rate of less than 3 seconds. The probe has a simple structure and is easy to install. It can be directly inserted into the flue for measurement, and can be inserted at different depths for different sections of the flue. The standard bus communication mode is used between the probe and the on-site transmitter cabinet, and all probe detection signals can be collected through a dual core cable. A transmitter cabinet can simultaneously connect 8 detection probes, greatly simplifying the construction and wiring workload on site. Due to its simple system structure and installation, as well as controllable cost, it is very suitable for distributed grid detection.

System features

This system uses distributed grid method for simultaneous measurement, with probes directly inserted into the flue. Multiple probes are installed on the flue section for simultaneous detection, and the detection data from multiple probes is displayed synchronously. Compared to traditionalThe CEMS multi-point sampling cycle detection system has fast response speed, no need for inspection, no sampling lag, simple structure, easy installation, and more convenient operation and maintenance.

Divided by a flue sectionTaking 5 zones as an example: The traditional 5-point sampling inspection CEMS system requires 5 sampling filter blowback probes, 5 electric heat tracing insulation integrated pipes, 5 high-temperature switching valves, and a set of CEMS system mainframe, as shown in the following figure.

Distributed grid method measurement system only requiresA set of in-situ direct insertion 5-point real-time measurement system consisting of 5 detection probes and a transmitter cabinet, with synchronized real-time monitoring and display of 5 measurement data channels, providing higher cost-effectiveness, as shown in the following figure.

List of System Technical Parameters

Installation site photos