Recent Posts

Tube Leak Detection in Power Plants
Jul 07, 2021 by Jeff Bossong

In today’s power production environment, thermal cycling is more common which stresses process equipment causing higher tube leak rates. The forced outage rate in 2019 for power plants was 6.97%.  Forced outages for combined cycle plants typically cost a plant $110,000 in fines, repairs and lost income.  Other causes of tube leaks include acidic / dew point corrosion from process gas and flow accelerated corrosion (FAC). We will review the diagnostic techniqu... Read More

Corrosion Resistant Humidity & Temp Sensors
May 25, 2021 by Jeff Bossong

There are many industrial processes that contain acid or caustic gases.  Power plants, potash dryers and ore processing are just a few harsh industrial environments.  These applications need accurate humidity and temperature sensors to control the process efficiently.  Humidity also has a large impact on the acid gas dew point temperature.  In most applications, the plant wants to keep the process temperature above the acid dew point temperatu... Read More

High Particulate Process Humidity Sensor
May , 2021 by Jeff Bossong

Many industrial process gases have high particulate loading.  Measuring process parameters (ie. humidity, particulate size, oxygen content) can be very challenging. The key issues are maintenance and blinding of the sensor.  For a humidity sensor to be useful, the maintenance must be low or the plant will not be able to use for control. Blinding causes the sensor to not respond to process changes which provides inaccurate ... Read More

Industrial Temperature and Humidity Sensors
May , 2021 by Jeff Bossong

An accurate, reliable humidity measurement has always been an issue for high temperature, high particulate, corrosive and condensing environments. Most OEM (dryer, boiler, kiln, HRSG…) manufacturers do not include humidity sensors as part of the control package because of the increased cost to the customer.  Another reason is that there are a lot of humidity sensor technologies that will not work in those environments and the OEMS do not want to expose themsel... Read More

Smokehouse Control
Feb 06, 2019 by H2O Admin
H2O / Wet Bulb Sensor Rental Program for Smokehouse & Oven Applications The sensor provides real time absolute humidity in the exhaust of any dryer, oven or kiln.  Particulates, organics, liquid smoke, natural smoke and condensing compounds have no effect on our sensor. The sensor is a direct measurement of the water molecule and is very repeatable so that the plant can dial into the same number every time with confidence. The accuracy of our sensor at 90C is 0.1% RH. Our... Read More
Dry Scrubber Control
Feb 19, 2018 by H2O Admin

Dry scrubber SO2 removal efficiency is improved at lower scrubber outlet temperatures and higher relative humidity.  If the humidity gets too high, then the dew point temperature becomes an issue causing a higher rate of corrosion downstream in the baghouse. Scrubbers are currently designed to run at a thirty degree approach to dew point with a fixed moisture content used for the dew point calculation. Having an accurate and robust humidity sensor for control allows... Read More

Waste to Energy / Biomass – Fuel Moisture Feedback
Dec 06, 2017 by H2O Admin
Combustion boilers utilizing fuels with varying moisture can see varying steam loads based on the fuel variability.  The more information the plant knows about the fuel moisture, the better the plant can plan accordingly to provide a more stable steam load.  Since waste to energy fuels have varying components, it is very hard to measure the fuel moisture on a real time basis prior to entering the furnace.  The same can be seen in biomass boiler applications. Another option to direct fuel m... Read More
Combined Cycle Plant Benefits
Aug 03, 2017 by H2O Admin
Knowing the water concentration at the HRSG outlet in combined cycle power plants can benefit the plant in 3 areas. The areas are corrosion protection during outages, tube leak detection and improved feed water temperature control. Many plants during outages need to eliminate water condensation so the tubes within the HRSG are not exposed to corrosion. Some plants insert balloons to eliminate humid, ambient air entering the HRSG during outages.  Another option is to monitor the dew point i... Read More
Steam Quality Sensor
Apr 20, 2017 by H2O Admin
H2O has adapted our absolute humidity sensor to provide steam quality measurements.  Our standard sensor utilizes dipole moment technology which measures the density of a process gas. It is a fixed volume, direct measurement of steam / process humidity.  The raw unit of the sensor is g/m3. Non-condensable gases will be determined with our standard system.  The density of the saturated steam is fixed at any given temperature and the difference between our measurement and the steam table densi... Read More
Spray Dryer Optimization
Apr 06, 2015 by H2O Admin
The capacity of a spray dryer is the amount of water evaporated within the dryer. The evaporation is directly correlated with the temperature drop across the dryer. The greater the difference between the inlet temperature and the outlet temperature, the more water is evaporated. In order to optimize the capacity, the inlet temperature of the dryer should be as high as possible (within the constraints of the product being dried) and held constant.  This also improves the energy efficiency of t... Read More

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