In the operation of industrial boilers, heating furnaces, and petrochemical equipment, acid dew point corrosion of flue gas is a key hidden danger that leads to a decrease in equipment efficiency and a shortened lifespan.Nernst第8Direct insertion online flue gas acid dew point meter（N2035A）Real time monitoring of acid dew point temperature provides a scientific basis for optimizing exhaust gas temperature and reducing low-temperature corrosion. This article analyzes its application principles and daily maintenance from two dimensions, helping enterprises achieve efficient equipment operation and safety control.

1、 Application principle of online flue gas acid dew point meter

1. Acid dew point corrosion mechanism

The sulfur element in industrial fuels (such as natural gas, coal, heavy oil) is converted intoSO₂, partiallySO₂Further oxidation toSO₃When the temperature of the flue gas drops to400℃When,SO₃Reacts with water vapor to generate sulfuric acid vapor（H₂SO₄）The condensation temperature is the acid dew point. If the exhaust temperature is lower than the acid dew point, sulfuric acid vapor will corrode the heating surface at the tail of the boiler, form sticky ash and block the flue, resulting in increased power consumption of the induced draft fan and equipment leakage risk. Therefore, accurately controlling the exhaust temperature slightly higher than the acid dew point is the core of improving thermal efficiency and safety.

2. Nernst第8Technical path of acid dew point meter

Multi parameter synchronous detection: The instrument integrates four parameters: oxygen content, water dew point value, moisture content, and acid dew point value, and achieves multi-dimensional data acquisition through a single probe.

Dynamic correction algorithm: Built in intelligent system automatically corrects environmental interference (such as smoke component fluctuations) to ensure the accuracy of acid dew point temperature measurement≤±2℃.

Fuel compatibility: supports lignite, coal washing, coal powder, natural gas, etc12Class fuel, depending on sulfur content andSO₃The conversion rate directly outputs the acid dew point value without the need for complex calculations.

3. Industrial application value

Energy efficiency optimization: A petrochemical company monitored the acid dew point in real-time to adjust the exhaust temperature from160℃drop to145℃Improved thermal efficiency1.2%Annual fuel cost savings exceed200Ten thousand yuan.

Corrosion prevention and control: A certain thermal power plant adjusts the blowing frequency based on acid dew point data to reduce the corrosion rate of the tail heating surface65%The maintenance cycle has been extended to3Year.

IINernst第8Daily maintenance specifications for acid dew point meter

1. Inspection and calibration

Daily check:

Confirm that there are no abnormal fluctuations in the data displayed on the screen (supporting both Chinese and English interfaces),4~20mAThe output signal is stable.

checkRS232/RS485Connect the communication interface to ensure that data is uploaded toDCSSystem.

Quarterly calibration:

Use a standard acid dew point generator (accuracy)±0.5℃）Calibrate sensor, error exceeds±2℃It is necessary to return to the factory for repair.

test3Programmable alarm output (high alarm, high high alarm, fault alarm) ensures that the sound and light alarm responds sensitively.

2. Core component maintenance

Probe maintenance:

Clean the detection hole filter every month to prevent dust accumulation from affecting measurement accuracy.

In high humidity environments (such as coastal chemical plants), check the probe heating device quarterly to prevent condensation from seeping in.

Electrical system:

Confirm that the power supply voltage isDC24V±10%Within the range, avoid voltage fluctuations that may cause sensor drift.

Check the resistance of the grounding wire≤4ΩTo prevent damage to the circuit board caused by lightning strikes or static electricity interference.

3. Emergency handling of faults

4. Environmental adaptability optimization

High temperature scenarios (such as garbage incineration plants): Install a high-temperature resistant sleeve at the probe (maximum tolerance)700℃）Extend the lifespan of the equipment.

Corrosive gas environment (such as sulfur recovery unit): Selection316LStainless steel casing and regularly coated with anti-corrosion coating.

3、 Maintenance management suggestions

Establish and maintain records: record the time and data of each calibration and component replacement, draw a trend chart of acid dew point temperature, and predict equipment corrosion risks in advance.

Personnel training: Operators need to master the probe cleaning, calibration process, and fault code interpretation to ensure quick response to abnormal working conditions.

Spare parts management: Reserve vulnerable parts such as sensors and filters to shorten maintenance downtime.

Nernst第8The direct insertion online flue gas acid dew point meter provides efficient anti-corrosion solutions for industrial boilers, heating furnaces, and petrochemical equipment through precise monitoring and intelligent regulation. Enterprises need to develop scientific maintenance plans based on process characteristics, with a focus on strengthening probe cleaning, electrical system inspection, and emergency response capabilities, to ensure stable operation of equipment under extreme conditions such as high temperature, high humidity, and high corrosion, ultimately achieving the dual goals of energy conservation, consumption reduction, and safety production.