Steam cost issue

It is unreasonable; it should be calculated based on the actual operating costs.

The process of using steam is important; the cost of recovering condensate should be low； Those that are not recycled cost much more

It’s not from a refinery; it also uses steam from coal-fired boilers and steam from waste heat boilers. 1. Steam can originate from various sources such as coal-fired boilers, waste heat boilers, and by-product steam. Under different circumstances, what is a reasonable and objective way to estimate the cost of steam? Based on the actual operating conditions (for units that are not in operation, use the steam balance network diagram from the thermal engineering department) to draw a network diagram of the steam supply. Indicate the unit generating steam (flow rate, pressure, temperature, properties) ； Each steam-using unit (flow rate, pressure) ； Main pipes, branch pipes, temperature and pressure reducers, etc. With this diagram, and by estimating based on the steam cost of each production unit in proportion to the flow rate, it’s a more reliable approach. 2. For example, assuming an average national coal price of 650 yuan per ton, a boiler efficiency of 85%, and steam generated at 11 MPa, is it reasonable to estimate the steam cost for coal-fired boilers at 220 yuan per ton? Two parameters are missing here, so it’s impossible to conduct a theoretical estimation! (Depending on the type of furnace and environmental regulations, coal costs generally account for 80-90% of the steam production costs.) The low calorific value of coal and the steam temperature are important factors to consider. The steam enthalpy value can be obtained from tables based on steam pressure and temperature ； Based on the enthalpy value of coal, along with heat balance and the operating efficiency of the boiler, the steam cost can be roughly estimated. The 11 Mpa steam here is considered high-pressure steam; therefore, the depreciation cost for the boiler equipment will be high, likely around 220 yuan per ton, though this figure may vary. I’ve never used steam of such a high quality; in my experience, the price is likely too high. There’s a question: Is an 85% combustion efficiency for such a large boiler considered too low? 95% is pretty good! The variable costs associated with steam production in coal-fired boilers are generally arranged in the following order: coal, electricity consumption, water consumption (desalinated water is expensive), alkali consumption, maintenance, machinery and materials (lubricants, filter bags, etc.), and labor costs. 3. To produce steam at 11 Mpa as well, for the steam generated as a by-product, considering the construction and maintenance costs of the pipeline and valve systems in the cascade network, is a cost of 20 yuan per ton of steam reasonable? The by-product steam is usually generated using waste heat evaporators; the main production costs are desalinated water and electricity consumption, resulting in a very low price. As a user, you can negotiate further with the steam supplier. Our waste heat steam is generated by external contractors; we provide the equipment and piping systems, as well as the deionized water. Steam is free. 4. Under actual conditions, on an annual basis, what would be the approximate proportions of by-product steam and coal-fired boiler steam respectively? Is 8:2 reasonable? Are there any other significant sources of steam? The ratio depends on the accompanying processes and plant capacity; theoretically, making maximum use of by-product steam is the trend, as it reduces costs! The current trend toward \"low-temperature waste heat\" stems from this reason as well. However, redundancy also needs to be taken into account; if the by-product steam system has a high failure rate, coal-fired boilers must have a certain degree of reserve, otherwise the system will be in a very difficult situation during maintenance and startup/shutdown. This should still be left to the design institute, with reference to similar companies. The steam generation units I am aware of are mainly coal-fired boilers and waste heat boilers. The potential for open sourcing is relatively low; it is recommended to start by focusing on cost reduction.

Could you provide an estimated steam price based on the situation of your company?

This post was last edited by The wise are enlightened on 2020-10-17 at 21:27. You can refer to the pricing provided by the district’s steam supply company; generally, for steam at 11 MPa, the cost is estimated to be 220 yuan per ton, which is roughly the same price. If it is cogeneration, the costs can be further **reduced**.

220 per ton, that’s about right; it’s that price we charge

We purchase 3.5MPa steam at a price of around 200.

We have also supplied saturated steam at 0.8 MPa to another company in the park; the flow rate was not high, around 5 t/h. It was 150 yuan per ton at that time, and it is said that the payment has not yet been fully collected.

It depends on the actual circumstances, but 220 yuan for a coal-fired boiler seems to be a reasonable price. Natural gas boilers are higher.