AITESA

𝐅𝐫𝐨𝐦 𝐬𝐥𝐮𝐝𝐠𝐞 𝐭𝐫𝐞𝐚𝐭𝐦𝐞𝐧𝐭 𝐭𝐨 𝐞𝐧𝐞𝐫𝐠𝐲 𝐫𝐞𝐜𝐨𝐯𝐞𝐫𝐲

Traditional sludge treatment often means high energy consumption, large waste volumes and increasing operating costs.

By combining 𝐬𝐨𝐥𝐚𝐫 𝐝𝐫𝐲𝐢𝐧𝐠, 𝐠𝐚𝐬𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐞𝐧𝐞𝐫𝐠𝐲 𝐫𝐞𝐜𝐨𝐯𝐞𝐫𝐲, waste water treatment plants can reduce moisture, lower operating costs and improve their energy balance.

At AITESA, we design integrated thermal solutions that help turn sludge treatment into a more efficient and energy resilient process.

Explore AITESA’s solutions here: https://aitesa.com/productos/

𝐑𝐢𝐬𝐤𝐬 𝐚𝐬𝐬𝐨𝐜𝐢𝐚𝐭𝐞𝐝 𝐰𝐢𝐭𝐡 𝐛𝐨𝐢𝐥𝐞𝐫 𝐬𝐡𝐮𝐭𝐝𝐨𝐰𝐧𝐬

As pressure and temperature fall, oxygen and residual moisture can create the conditions for 𝐢𝐧𝐭𝐞𝐫𝐧𝐚𝐥 𝐜𝐨𝐫𝐫𝐨𝐬𝐢𝐨𝐧 in drums, evaporators, economizers and steam circuits.

The impact often appears later, during restart: longer preparation time, additional flushing, contamination of the water steam cycle, damage to protective magnetite layers or higher tube reliability risk.

That is why 𝐩𝐫𝐞𝐬𝐞𝐫𝐯𝐚𝐭𝐢𝐨𝐧 should be defined before the shutdown, not once the equipment has already cooled down.

For short outages, wet preservation may be enough if water chemistry is properly controlled. For medium outages, nitrogen blanketing can help reduce oxygen ingress. For extended shutdowns, dry preservation is usually the most robust option, although it requires more preparation and a clear restart plan.

The key decision is to match the preservation method to the expected outage duration and the operational requirements of the next startup.

A boiler is protected when its internal environment is controlled.

At AITESA, we work with industrial boilers, HRSGs and heat recovery equipment designed for long term operational reliability, including shutdown and preservation considerations that directly affect equipment lifetime and restart performance.

Learn more about the boilers we design and how they are maintained: https://aitesa.com/en/water-tube-heat-recovery-boiler-hrsg/

𝐇𝐨𝐰 𝐚 𝟓𝟎 𝐌𝐖 𝐭𝐡𝐞𝐫𝐦𝐨𝐬𝐨𝐥𝐚𝐫 𝐩𝐥𝐚𝐧𝐭 𝐢𝐧 𝐂𝐡𝐢𝐧𝐚 𝐫𝐞𝐜𝐨𝐯𝐞𝐫𝐞𝐝 𝟕 𝐆𝐖𝐡 𝐟𝐫𝐨𝐦 𝐚𝐯𝐚𝐢𝐥𝐚𝐛𝐥𝐞 𝐡𝐞𝐚𝐭

In a thermosolar plant, heat represents a significant opportunity energy recovery

This was the challenge AITESA addressed in a 50 MW thermosolar plant in China. The plant had significant thermal flows available, and the objective was to make better use of them to improve overall energy efficiency within the existing power cycle.

AITESA implemented a heat recovery boiler with an integrated heat exchange train designed to improve energy recovery across four key points of the cycle:
• 𝐄𝐜𝐨𝐧𝐨𝐦𝐢𝐳𝐞𝐫: Preheated the high pressure feed water (over 100 bar) with the remaining HTF energy before steam generation.
• 𝐒𝐭𝐞𝐚𝐦 𝐆𝐞𝐧𝐞𝐫𝐚𝐭𝐨𝐫: Converted the recovered heat into high-pressure steam for the main power cycle.
• 𝐒𝐮𝐩𝐞𝐫𝐡𝐞𝐚𝐭𝐞𝐫: Increased the steam energy level before turbine inlet.
• 𝐑𝐞𝐡𝐞𝐚𝐭𝐞𝐫: Reheated the steam after the first turbine expansion at lower pressure (over 20 bar) to support a second expansion stage.

𝐓𝐡𝐞 𝐫𝐞𝐬𝐮𝐥𝐭: an increase in overall efficiency from 35.5% to 37.5%.

For a 50 MW asset, that improvement represented 7 GWh per year of additional recovered energy that would otherwise remain unused. In thermosolar plants, this type of opportunity often starts by reviewing how the boiler and heat exchange train use the available heat across the steam cycle.

To assess whether a similar solution could apply to your plant, feel free to reach out at: https://aitesa.com/en/contact/

Explore AITESA boiler solutions at: https://aitesa.com/en/water-tube-heat-recovery-boiler-hrsg/


中国 50 MW 光热电站如何通过余热回收增加 7 GWh 发电量

在光热电站中，热能代表着巨大的能源回收机会。

这正是 AITESA 在中国某 50 MW 光热电站中所解决的挑战。该电站拥有大量的可用热流，其目标是更有效地利用这些热流，以提高现有动力循环的整体能源效率。

AITESA 实施了一套带有集成换热系统的余热锅炉，旨在优化循环中四个关键节点的能源回收：
• 省煤器： 在产生蒸汽前，利用剩余的导热油能量预热高压给水（压力超过 100 bar）。
• 蒸汽发生器： 将回收的热量转化为高压蒸汽，用于主动力循环。
• 过热器： 在进入汽轮机之前提高蒸汽的能量等级。
• 再热器： 对第一级汽轮机膨胀后的低压蒸汽（超过 20 bar）进行再热，以支持第二级膨胀。

结果： 整体效率从 35.5% 提升至 37.5%。

对于一个 50 MW 的资产而言，这种改进意味着每年额外回收 7 GWh 原本会被浪费的能量。在光热电站中，这类优化机会通常始于重新评估锅炉和换热系统如何在蒸汽循环中利用可用热能。

如需评估类似解决方案是否适用于您的工厂，请随时联系：https://aitesa.com/en/contact/

了解更多 AITESA 锅炉解决方案：https://aitesa.com/en/water-tube-heat-recovery-boiler-hrsg/