Online flue gas acid dew point meter

★ Application scope:

Nernst in-line flue gas acid dew point meterCan be realMeasure the acid dew point temperature in the flue gas of the boiler and heating furnace online. Based on the measured acid dew point temperature, the exhaust temperature of boilers and heating furnaces can be effectively controlled, reducing low-temperature sulfuric acid dew point corrosion of equipment, improving operational thermal efficiency, increasing boiler operation safety, and extending equipment service life.

★Application features:

due toNernst in-line flue gas acid dew point meterAfterwards, an acid dew point sensor with a direct insertion flue is adopted, which can monitor the acid dew point value in the flue gas of the boiler and heating furnace in real time, as well as the water vapor（%Water vapor value or dew point value（-50℃～100℃）And moisture content（Ggram/KGPer kilogram) and humidity valueRHUsers can use the instrument's display or2road4～20mAOutput signals to control the exhaust temperature within a range slightly higher than the acid dew point of the flue gas, in order to avoid low-temperature acidic corrosion and increase the safety of boiler operation.

★ Application principle:

In industrial boilers or power plant boilers, petroleum refining enterprises, and heating furnaces, fossil fuels (natural gas, refinery dry gas, coal, heavy oil, etc.) are generally used as fuel. These fuels contain a certain amount of sulfur to varying degrees, which is produced during peroxide combustionSO2Due to the presence of excess oxygen in the combustion chamber, under normal excess air conditions, there is a small amount ofSO2Further combine with oxygen to generateSO3andFe2O3andV2O5(Smoke and heated metal surfaces contain this component). allSO2There are about1~3%convert intoSO3In high-temperature flue gasSO3Gas does not corrode metals, but when the flue gas temperature drops to400℃following,SO3It will combine with water vapor to generate sulfuric acid vapor, and its reaction formula is as follows:

SO3+ H2O ----------H2SO4

When sulfuric acid vapor condenses onto the heating surface at the rear of the furnace, low-temperature sulfuric acid dew point corrosion occurs. At the same time, the sulfuric acid liquid condensed on the low-temperature heating surface will also adhere to the dust in the flue gas, forming a sticky ash that is difficult to remove, causing the flue gas channel to be blocked or even obstructed, while increasing resistance, thereby increasing the power consumption of the induced draft fan. The occurrence of corrosion and ash blockage is a hazard to the working condition of the boiler heating surface.

Due to the presence of bothSO3When water vapor meets, it will produceH2SO4 Steam causes an increase in the acid dew point of the flue gas. When the exhaust temperature is lower than the acid dew point temperature of the flue gas,H2SO4Steam will stick to the flue and heat exchanger to formH2SO4The solution corrodes the equipment, leading to heat exchanger leakage and flue damage. In a device that is equipped with a heating furnace or boiler, its energy consumption accounts for about% of the total energy consumption of the device50%The exhaust temperature affects the thermal efficiency of the heating furnace and boiler operation. The higher the exhaust temperature, the lower the thermal efficiency. As the exhaust temperature increases10℃The thermal efficiency is approximately reduced1%The exhaust temperature is too low. If it is lower than the acid dew point temperature of the flue gas, it will cause equipment corrosion and pose a safety hazard to the operation of the heating furnace and boiler. The reasonable exhaust temperature of heating furnaces and boilers should be slightly higher than the acid dew point temperature of the flue gas. So determining the acid dew point temperature of heating furnaces and boilers is the key to improving their operational thermal efficiency and reducing operational safety hazards. At present, in combustion boilers and petroleum refining enterprises, in order to obtain the acid dew point of flue gas from heating furnaces and boilers, a flue gas acid dew point meter is generally used for monitoring.

★ Technical Features:

◆Probe measurement:1The instrument can simultaneously measure water dew point value, moisture content, and acid dew point value.

◆Multi output control: The instrument has two channels4～20mACurrent output and computer communication interfaceRS232andRS485.

◆measure quantity Fan Surrounding:

0℃～200℃Acid dew point value,0～100%Water vapor,-50℃～100℃Dew point value and moisture content(ggram/KgPer kilogram).

◆report police set Place: There are instruments available1Road universal alarm output and3Programmable alarm output.

◆self move school Positive: The instrument will automatically monitor various functional systems and calibrate them to ensure the accuracy of the instrument during measurement.

◆wisdom can be Unified: The instrument can have human-machine dialogue and complete various functions according to predetermined settings.

◆Display output function: The instrument has a strong ability to display various parameters and has strong output and control functions for various parameters.

◆Variable parameter selection: It can be generated based on different fuels (lignite, washed coal, coal powder, natural gas, blast furnace gas, heavy oil, various grades of fuel oil, etc.) with different sulfur contentsSO2And the conversion of various fuels intoSO3The conversion rate selection directly obtains high-precision combustion flue gas acid dew point values for each fuel.

★Specifications：