Transformed water vapor ratio

This post was last edited by 654262293 on 2016-5-25 05:59. As an example: the pressure of water gas is 3.40 MPa (gauge pressure), its temperature is 214.8°C, and the flow rate of wet water gas is 180,000 Nm3/h. The water vapor ratio can be calculated as follows: By referring to the table showing the relationship between saturation temperature and pressure of water vapor, it can be determined that at 214.8°C, the saturated vapor pressure of water vapor is 2.0 MPa (gauge pressure). Vapor ratio = partial pressure of saturated water vapor / partial pressure of water-gas mixture = (2.0 + 0.1) / (3.4 – 2.0 + 0.1) = 1.4. Online sensors for measuring the vapor ratio are rarely installed in conversion units. In processes such as medium-low temperature conversion, full low-temperature conversion, sulfur-tolerant conversion for water-gas slurry production, and sulfur-tolerant conversion for pulverized coal gasification, such sensors have been seen many times; however, there are no instances of online sensors for measuring the vapor ratio being used, as there is no need for them.

Is there a formula that allows the calculation of the water vapor ratio without the need to refer to a table of steam temperature values?

On the DCS screen, the water vapor ratio is calculated using software. Does anyone know how to do this and what the results are like?

This post was last edited by 654262293 on 2022-3-11 19:16

Yunnan Dada has DCS screens available; you can ask about them

At this temperature, the saturated vapor pressure of water divided by the total pressure minus the saturated vapor pressure of water

The actual water-vapor ratio is higher than the calculated value; since it is not an ideal gas, the calculated value must be divided by a compression factor. The specific value can be found in textbooks on chemical engineering principles, and it is generally around 0.8