Solution Overview

1. Design conditions

There are four desulfurization towers in a power plant, each with a height of 40m, a temperature of 70 ℃, and a pressure of atmospheric pressure; The smoke flow of 1 #, 2 #, and 4 # is 80000m3/h; The pressure force of desulfurization tower 3 # is 120000m3/h; SO2 content is 1000-1200mg/m3; SO2 emissions are required to be within 50mg/m3.
Three desulfurization towers in the second power plant, each with a height of 30m, a temperature of 70 ℃, and a pressure of atmospheric pressure; The smoke flow of 1 # and 2 # is 80000m3/h; The pressure force of desulfurization tower 3 # is 110000m3/h; SO2 content is 1000-1200mg/m3; SO2 emissions are required to be within 50mg/m3.

2. Product Description

2.1 Testing (Sampling Point) Location and Component Content
Monitoring location: desulfurization and denitrification outlet
Testing component: SO2;
Pre selected range: 0-1000 ㎎/m ³ (adjustable)
2.2 Sampling method: Sampling probe/flange installation (extraction type)
2.3 Detection principle: SO2 UV principle
2.4 Analysis System Design Core: Real time Online Monitoring
2.5 Purpose of Testing Process
Continuous and real-time monitoring, recording, and analysis of SO2 at the outlet of desulfurization and denitrification, providing feedback on process control basis.

3. Main configuration and parameters

System model: ERUN-QZ9340
Analyzer model: ERUN-QZ9160
Analysis object: SO2
Range: SO2:0~1000 ㎎/m ³ (adjustable)
Zero drift: ≤± 0.1% FS/7d
Range drift: ≤± 0.1% FS/7d
Repeatability: ≤ 0.5%
Output signal: 4-20 mA DC
Load: ≤ 650 Ω
Power supply: 220VAC 50Hz

4. Public works and usage conditions

Power supply voltage: AC220V ± 20%, frequency 50 ± 2Hz; it is recommended to obtain power locally to ensure relatively stable voltage and power frequency, provided by the user.
Analysis Room: Environmental temperature of system components: 5-40 ℃; Environmental temperature of system components: -20~50 ℃; Humidity: ≤ 90%; It is recommended to set up an analysis cabin on the desulfurization tower platform or install it in the original analyzer equipment room. The principle is to shorten the length of the sampling tube as much as possible to facilitate observation and maintenance while ensuring that the equipment conditions are met, data output is accurate, and the equipment is running normally.
System pressure requirement: 86-106kPa (on-site flue gas pressure meets system requirements)
System flue gas temperature requirement: ≤ 400 ℃ (on-site flue gas temperature meets system requirements)
System sampling flow requirement: 2L/min (determined according to the final installation plan, if the length of the sampling tube is greater than 10m, an extraction pump will be added to meet the system sampling flow requirement)
System instrument air pressure: 0.3Mpa
The total power consumption of the entire equipment (kVA): ≤ 5KVA

Scheme composition
Based on the requirements of Party A, the on-site situation, and economic cost considerations, two testing plans have been preliminarily formed through our personnel on-site investigation and detailed design and verification by the technical department:
Option 1
The design concept of this scheme is to equip each desulfurization tower with a complete set of SO2 monitoring system. This scheme can continuously monitor the SO2 emissions of each desulfurization tower in real time, providing a basis for process control and detecting data in real timeaccurateThe system runs stably, requires minimal maintenance in the later stages, has simple technology, and can solve monitoring problems in one go. The possibility of later technological upgrades is small, and the cost of on-site installation of auxiliary materials and debugging personnel is relatively low.
System schematic diagram:

Option 2
The design concept of this plan is to share one SO2 analyzer with two desulfurization towers, each equipped with separate sampling equipment, pretreatment equipment, and backwashing equipment. The analyzer can switch back and forth within a specified time (≥ 4 hours) to analyze and output the SO2 emission data of one desulfurization tower. This plan intermittently monitors the SO2 emissions of each desulfurization tower, which cannot provide real-time basis for process control. It has high energy consumption, long response time, slightly lower accuracy of detection data, and may result in the SO2 monitoring data of two desulfurization towers being interlinked. The system operation stability is slightly low, and there is a large amount of maintenance and technical complexity in the later stage. There is a high possibility of technical transformation in the later stage, and the on-site safety is also high
The cost of installation and debugging personnel is relatively high.

Schematic diagram of the analysis system:

Install and run
Installation diagram of smoke sampler (hereinafter referred to as sampling probe)
The sample gas enters the sampling probe through the sampling rod and is filtered by a ceramic filter to remove dust from the sample gas; The sampling probe is heated to 120 ℃~150 ℃ by a heater to prevent condensation of the sample gas after passing through the sampling probe.



System operation process

Engineering construction process

Engineering Installation Control Flow Chart