Explosion proof gas quantity and calorific value analysis online system

I. Overview

Xi'an Saipu Automation Instrument Technology Co., Ltd. is an online monitoring instrument designed for continuous monitoring of gas content in pipelines such as smelting/chemical/coal coking/kiln/cement/petrochemical. Different measurement parameters can be selected according to different environments. The monitoring system can accurately measure the content of each component of coke oven gas and calculate the calorific value. Through communication interface and computer control, it can also be transmitted to the DCS central control system through standard analog signals for easy use by users.

The system consists of gas analyzer, pre-processing, sampling probe, etc., which completes the online measurement of the calorific value of coke oven gas and achieves continuous and uninterrupted data monitoring.

The chemical online monitoring system provided by the supplier supports multiple communication methods mentioned above, which can not only meet the safety monitoring requirements of internal facility operations, but also enable the central control department to supervise and manage on-site equipment, truly achieving multiple benefits from one investment.

2、 Scope of work

The second party shall provide full process services including design acceptance, one-time driving and operation maintenance.

The design, assembly, and provision of on-site sampling systems and preprocessing devices will be the responsibility of Party B.

The provision and connection of on-site public works conditions will be the responsibility of Party A.

The second party is responsible for the design, assembly, installation, etc. of all equipment and materials within the scope of the analysis system.

Any unresolved matters shall be resolved through consultation between both parties

Analyze system parameters

(1) Gas pretreatment composition:

Vortex condenser: 3-5 ℃

Mist filter: 5um

Injection ball valve: 220V AC

Blow off solenoid valve: 220V AC

Precision filter: 0.1um

(2) Gas sampling probe

Suitable ambient temperature: ≤ 750 ℃

Dust concentration: ≤ 2000g/m3

Insertion length: L=100-600mm

Sampling tube length: customized according to user requirements

Dust removal capacity: 99%

Filter material: Stainless steel sintered filter

Filter accuracy: 40um

(3) Dehumidification dryer

Environmental temperature: ≥ 2 ℃ ≤ 40 ℃

Inlet air temperature: ≤ 400 ℃

Temperature setting value: 1.5 ℃± 0.5 ℃

Working power supply: 220V/AC 50Hz

Power: 45W 3A

Gas range: 1-3 L/min

Weight: Approximately 1kg

(4) Electromagnetic valve

Closing time: 0.5S

Vacuum degree: zero leakage

Voltage: 220VAC ± 10% 50Hz

Power: 10W

(5) Instrument parameters

The infrared instrument adopts German imported sensors, mechanical cut light modulation method, and thin film microphone detector. The technology is mature, stable, and reliable, with low cross interference and corresponding concentration compensation for detecting small mixed gases affected by water vapor interference.

Multi component gas analyzer

Online multi-component gas analyzer, using analytical calculation method, quickly and accurately analyzes the concentration values of various gases, and calculates the corresponding calorific value based on the concentration values.

The multi-component gas analyzer adopts imported infrared sensors, fuel cell oxygen sensors, and thermal conductivity sensors, and uses * * digital processing technology to achieve continuous, automatic, and rapid online detection of various gases such as CO2, CO, CH4, H2, O2, etc. The CH4 sensor uses a laser principle sensor with strong resistance to hydrocarbon interference, the CO2 and CO sensors use German Schulz sensors, and the H2 sensor uses German Hailip

Thermal conductivity detection sensor, O2 adopts Japanese Figaro anti-interference electrochemical sensor, the entire instrument has stable performance and small drift.

3、 Technical requirements

1. This technical solution meets the standards proposed by the purchaser. In addition to providing * * products that meet the purchaser's requirements, the provided products also meet the requirements of China's industrial standards and have certification issued by China's environmental protection administrative department and various qualification certificates from relevant departments.

If there is a conflict between the standards used in this technical solution and the standards implemented by the purchaser, the higher standard shall prevail.

3. Equipment name: Gas Heating Value Online Analysis System

4. Installation location: Indoor

5. Monitoring items: CO/CO2/CH4/H2/O2 calorific value

4、 System principle

The system consists of gas analyzer, preprocessing, sampling probe, etc., which completes online measurement and achieves continuous and uninterrupted data monitoring. It can implement continuous and uninterrupted sampling at one point, with good continuity and low electrical automation. The analyzer adopts German infrared, thermal conductivity and other principle technologies to monitor the calorific value and other contents of the generator gas. The sample gas is wet sampled through a sampling probe to extend the maintenance cycle. The sampling gas path uses a composite heat tracing sampling tube.

The analysis system includes a sampling probe and a sample preprocessing system. The sampling tube is directly connected to the sampling probe, and the output interface is a 10mm card sleeve. The preprocessing system includes corrosion-resistant solenoid valves, pressure reducing valves, stabilizing valves, mist filters, precision filters, regulating analysis valves, switching valves, flow meters, vacuum pumps, peristaltic pumps, dehumidifiers and other components. Its function is to purify the sample gas to the analytical requirements of the analyzer, and it is composed of a pressure reducing system to prevent damage to the analytical instrument caused by excessive sample gas pressure.

The sample pretreatment system is installed in the instrument cabinet, and the temperature of the chassis is at room temperature. The sampling probe is installed in the on-site gas pipeline, and the sample pretreatment system consists of an electric valve, a dehumidifier, a mist filter, a precision filter, a bypass flow meter with a regulating control valve, a sample gas flow meter, etc. The material in contact with the sample is made of corrosion-resistant and high-temperature resistant polytetrafluoroethylene material.

The sample from the fast loop is discharged into the fast loop manifold, and the analyzed sample gas is directly discharged into the atmosphere. The condensate is discharged into the condensate manifold, which improves the system's response time and reduces lag time.