The ERUN-XT3900 coke oven gas process gas analysis system is designed modularly and targetedly based on the specific operating parameters and requirements of the coking plant, using the mature sampling pretreatment technology and analysis control technology of Yingrun Environmental Protection. The ERUN-XT3900 process gas analysis system analyzes the concentration of process gas online and provides real-time alarms for high concentration of process gas. Having advanced level in the same industry. The ERUN-XT3900 system mainly consists of a sampling unit, a sample gas processing unit, an analysis unit, a calibration unit, and a PLC interlocking control unit. Adopting single channel and dual channel sampling analysis control technology to continuously monitor gas concentration. The system has many characteristics such as safety and reliability, authentic sampling, fast response, high analysis accuracy, configuration and selection.

1. Product Description

1.1 Testing (Sampling Point) Location and Component Content
Gas main pipeline inspection component: O2: 0-5% (adjustable range)
1.2 Sampling method: Sampling probe/flange installation
1.3 Detection principle: O2 * high-performance paramagnetic oxygen analyzer
1.4. Analysis System Design Core: Real time Sampling Analysis
1.5 Purpose of Testing Process
Continuous and real-time monitoring, recording, and analysis of oxygen concentration in the production process of coke oven gas, providing safety alarm information and feedback process control basis. Prevent safety hazards such as water and gas leaks in the production process.
1.6 System Scheme Color Map

1.7 The main configuration is as follows:
Product Model: ERUN-XT3900
Analysis object: O2
Range: 0-5%
Zero drift: ≤± 0.1% FS/7d
Range drift: ≤± 0.1% FS/7d
Repeatability: ≤ 0.5%
Output signal: 4-20 mA DC
Display: LCD display
Load: ≤ 650 Ω
Power supply: 220VAC 50Hz

ERUN-1000 gas sampling probe (German MUC technology)
Probe long tube: L=1000mm

FE filtration system
Filtering accuracy: 0.3 μ m
Enduring high flue gas temperature: ≤ 750 ℃
Applicable dust volume: ≤ 2000g/m3
Steam or electric heat tracing belt
Reverse blowing: High temperature steam
1.8 User Site Requirements
Power supply: 220 V AC 50Hz
Backblowing: pressure 0.4-0.6 Mpa (dust-free, waterless, oil-free); For analysis system blowback use
Analysis system installation location: inside the cabin (Good ventilation, clean, and the temperature inside the cabin should not be lower than 10 ℃)

2.1 Sampling and preprocessing unit
Sampling pretreatment is the key to the continuous and reliable operation of process analysis instruments online. The sampling and pretreatment unit of this device adopts a special structural design, using a purification method that combines graded filtration dust removal, coarse filtration, and fine filtration. Long term on-site operation has shown that it effectively solves the problems of passive filtration accumulation blockage, large maintenance workload, and low online continuous operation rate under high dust, high sulfide, and high humidity conditions. Stable and reliable performance, with minimal maintenance workload. The mainstream technology for sample gas treatment in the explosion-proof oxygen analysis system of coke oven gas is the wet process technology route of steam jet pump sampling and water washing and decontamination invented by Shifumei Company. Its fundamental technical defect is the release of dissolved oxygen in water, which can cause uncertain positive interference errors. Xi'an Yingrun Environmental Protection Technology Co., Ltd. combines the advantages of traditional technology and adopts a dry process technology route as a breakthrough innovation to replace the wet process technology route. The sample gas does not come into contact with water or steam, avoiding interference with symbiotic information. It consists of three parts: probe tube assembly, high-efficiency water cooler (cooling water flow rate of about 4L/min), and combined high-efficiency defogging filter separator. The main body is 31 cm high and is installed on the gas pipeline in a flange style. After the sample gas of coke oven gas is cooled, the dust, tar, naphthalene and other pollutants separated by dehazing, filtering and gas water separation will automatically flow back to the gas pipeline with the condensate, achieving maintenance free engineering applications. The reverse blowing cycle is preset and optional for about 4-8 hours, effectively ensuring coordinated operation without maintenance, distortion, and long lifespan.

The sampling probe chamber is made of 306 stainless steel material, and the sampling tube is made of Teflon material, which is a corrosion-resistant and high-temperature resistant product. The filter element adopts SiC ceramic filter, which has the characteristics of large filtration area and high filtration accuracy. When replacing, it can be pulled out from the device as a whole, with simple operation and no need for tools, greatly reducing maintenance and replacement time and labor intensity.

2.2 Composition of Sample Gas Processing System
The sample gas processing system consists of modules such as refrigeration chamber, water removal, coke and oil removal, pressure regulation, and flow regulation.

2.3 Interlocking control device
The system control chain unit is controlled by the Siemens PLC series programmable controller as the control center, which completes the anti blocking automatic alarm, automatic blowback, and automatic injection of the system sampling pipeline and sampling probe filter, and automatically monitors the composition of the furnace gas and transmits data remotely according to the program settings.
2.4 Analysis device
The analysis unit is equipped with a new laser analyzer from Germany, which completes online continuous analysis of sample gas O2. Imported sensors have stable and reliable performance, fast response time, and high level of intelligence.
2.5 Blowing device
The blowing unit consists of a filter, a pressure reducing valve, and a steady flow device. Compressed air (nitrogen) can be used as the gas source to connect to the sample gas blowing inlet. If dual gas path automatic switching sampling is selected, the continuity of gas sampling will not be interrupted during the back blowing of the entire analytical instrument, ensuring continuous online monitoring and real-time control of the entire analytical device.

This device uses PLC as the control center to achieve automatic analysis of sampling, blowback, filtration, and O2 gas content of coke oven gas. When the "PLC" receives the instruction signal for "analysis", the device automatically executes the "analysis and measurement program". At this time, the sampling electric ball valve automatically opens, starts the sampling vacuum pump, and extracts the sample gas from the furnace or pipeline to complete the collection of the sample gas. The sample gas continues to undergo purification, dehumidification, desulfurization and other treatments along the main flow path through the heat tracing belt, ensuring that the sample gas before entering the instrument meets the requirements of ultra clean and constant temperature. The automatic analysis of gas composition is completed and the standard current signal is output. According to the program settings, the automatic detection of gas composition in the furnace or pipeline is completed. When the "PLC" receives the command signal of "reverse blowing", the device automatically executes the "purification reverse blowing program", and at the same time, another sampling device is started. At this time, the injection electric ball valve automatically opens, and the high-pressure reverse blowing airflow and vibration control vibrate and blow back the sampling pipeline to ensure that the sampling pipeline is unobstructed.