Steam quality measurement system

摘要

A system and method for continually and automatically measuring the quality of steam includes a steam dryness/superheat meter and a non-condensable gases (NCG) meter. The steam dryness meter includes a throttling calorimeter through which a steam sample enters at atmospheric pressure, sensors for sensing the pressure and temperature of the stream before and after it enters the calorimeter, a controllable heat input for supplying any additional energy necessary to superheat the steam sample, and logic for deriving the dryness from the collected data. The NCG meter includes a cooler for condensing the steam sample reservoirs into which the liquid and non-condensable gases are entrapped and measured, and logic for continuously deriving the NCG ratio from the collected data.

主权项

1. A system for measuring the quality of steam flowing through a conduit including
a steam dryness meter having a throttling calorimeter, at least one sensor for sensing a thermodynamic condition of the steam upstream of the calorimeter, at least one other sensor for sensing the condition of the steam sample in the calorimeter, and a controllable heat input for applying heat to the steam sample; a non-condensable gases meter including, a cooler for condensing a superheated steam sample, and a reservoir including an inverted bucket where the condensate and non-condensable gases separate and are entrapped, at least one sensor operably connected to the inverted bucket, at least one other sensor operably connected to the reservoir; and a computer operably connected to the sensors in the steam dryness meter and the non-condensable gases meter for periodically receiving the data signals corresponding to the sensed steam sample conditions in each of the steam dryness meter and the non-condensable gases meter, the computer including first logic on a computer readable medium, which first logic may be executed by the computer for determining the dryness of the steam sample based upon the sensed steam sample conditions and second logic on a computer readable medium, which second logic may be executed by the computer for determining the ratio of water to non-condensable gases in the condensed steam sample based on the sensed steam sample conditions in the inverted bucket and the reservoir.