Steam temperature and cost

Steam prices mainly include the primary raw materials used to produce steam-based products as well as the costs of energy (the variable costs of coal, water, and electricity), the fixed costs associated with operating the facilities that produce steam, along with operating expenses and profits. Therefore, the steam of different pressure levels required on the first floor needs to be calculated by the finance staff.

A general range like this cannot be given. The price varies depending on whether natural gas or fuel oil is used, or whether lump coal or coal powder is used.

A general range like this cannot be given. The price varies depending on whether natural gas or fuel oil is used, or whether lump coal or coal powder is used.

This post was last edited by pzhmotor on 2016-7-7 at 14:28. What are the temperatures of 3.5mpa steam, 1.0mpa steam, 0.6mpa steam, and 0.35mpa steam? Superheated steam refers to steam with a temperature higher than that of saturated steam; different pressures correspond to different saturated steam temperatures, and the exact temperature of superheated steam depends on the degree of superheating. The saturation temperature of 3.5mpa steam is 242.56 ℃ ； The saturation temperature of 1.0mpa steam is 179.89 ℃ ； The saturation temperature of 1.0mpa steam is 158.83 ℃ ； The temperature of saturated steam at 0.35 MPa is 138.86 °C. (Refer to the ‘Charts of Thermodynamic Properties of Water and Steam’.) The cost of steam is directly related to the process used and the thermal efficiency of the boiler; for example, waste heat boilers do not consume fuel aside from water supply and electricity costs, so their cost is low, potentially around 10 yuan per ton. The steam production cost of coal-fired boilers is directly related to the local coal price and the boiler’s thermal efficiency. In my case, I have CFB boilers with a combustion efficiency of around 86%, producing superheated steam at 3.82 Mpa and 420–450°C; the variable cost is approximately 110–125 yuan per ton. The steam production cost of gas boilers is directly related to the price of gas and the boiler’s thermal efficiency (the thermal efficiency of gas boilers is generally higher than that of coal-fired boilers, at around 90%). The enthalpy value can be used to estimate fuel costs; adding the electricity consumption gives the variable costs. Of course, the utilization of by-product gases (waste gases), such as carbon black exhaust gas, yellow phosphorus exhaust gas, and blast furnace gas, can significantly reduce costs.