Take a look at the “cutting-edge technology” on this device: 77 – Zero Energy Consumption – Boiler Feedwater Waste Heat Utilization System
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In the boiler feedwater treatment process, deoxygenation is a very critical step. The oxygen corrosion products, primarily composed of iron oxide, deposit or adhere to the boiler tube walls and heating surfaces, forming insoluble iron scale that impairs heat transfer. This leads to the formation of pits on the inner walls of the tubes and an increase in the thermal resistance coefficient. When pipeline corrosion is severe, pipeline explosions can even occur. The traditional boiler feedwater deoxidation technique is thermal deoxidation. The principle involves using steam to heat the deionized water to a saturated state, increasing the vapor pressure of water and reducing the oxygen pressure in order to remove dissolved oxygen from the water. The disadvantage of this technology is that, first, the dissolved oxygen level during deoxygenation is prone to being affected by factors such as the treatment volume, inlet water temperature, and fluctuations in steam pipeline pressure ； Secondly, the deoxygenation process requires steam heating not only, but also involves the emission of waste steam, resulting in high energy consumption and environmental pollution at the site. Today, I recommend a “zero-energy consumption – waste heat utilization system for boiler feedwater”. For more shares, please check the “Explore the ‘Advanced Technologies’ on Devices” series: https://bbs.hcbbs.com/thread-3056492-1-1.html
“The “Zero Steam Consumption – Waste Heat Utilization System for Boiler Feedwater” is a new technology developed to address the shortcomings of thermal deoxidation techniques; it is suitable for replacing thermal deoxidizers that fail to meet deoxidation standards and require chemical additives for deoxidation. Process introduction: The “Zero Steam Consumption – Waste Heat Utilization System for Boiler Feedwater” consists of three units: a deaeration unit, a waste heat utilization unit, and an intelligent heat and oxygen control center. The deoxygenation unit uses normal-temperature deoxygenation; its main function is to remove dissolved oxygen from water, ensuring that the dissolved oxygen level in the deoxygenated water meets the technical standards. The resulting parameters satisfy the requirements for feedwater quality in boilers of various pressure levels. The waste heat utilization unit is a set of heat integration equipment designed based on the enterprise’s waste heat conditions. Its main function is to fully recover and utilize process waste heat, heating deoxygenated water to the temperature required by boilers or steam drums (≥104°C), thereby eliminating the need for thermal deaeration steam and achieving energy savings and carbon reduction. The core equipment of the Smart Thermal Oxidation Center is an intelligent optimization control system, which integrates a database and system optimization calculation models. The model automatically optimizes control based on real-time data, ensuring that the dissolved oxygen levels remain within acceptable limits and stable under various operating conditions. It can also provide deoxygenated water at different temperatures to meet the production requirements as dictated by the process needs.
Technical advantages: (1) Zero steam consumption: no need for steam heating； No steam leakage ； No chemicals need to be added. (2) Low energy consumption: Low operating energy requirements (for a processing capacity of 50 t/h): 4 kW of electricity, 4.5 m3/h of nitrogen, and 2 m3/h of circulating water. (3) Real-time monitoring: The deoxygenation parameters are monitored and displayed in real time to ensure their stability. (4) Waste heat utilization: It provides ample opportunities for making use of waste heat, thereby saving the heating steam required for traditional thermal deaeration. Deoxygenated water at different temperatures is available to meet various production requirements. (5) System energy savings: If a company is facing an excess of steam, a comprehensive solution for steam balance is provided to ensure true energy savings for the company. (6) Light weight: The system is supplied in skid-mounted modular form, allowing for an increase in processing capacity to meet the expansion needs of production systems ； The amount of work on-site is small ； It can be installed on the ground or a platform.
Case: A petrochemical company under CNOOC carried out energy-saving upgrades using this technology in order to reduce the consumption of thermal deaeration steam and the amount of waste steam emitted. System design requirements: (1) Processing capacity: 400 t/h. (2) The dissolved oxygen content in the water after deoxygenation is ≤7μg/l. (3) The system’s heat recovery capacity is ≥ 3000 kW. Since its commissioning, the system has operated stably and efficiently, with levels of dissolved oxygen, heat exchange capacity, nitrogen consumption, and power consumption all exceeding the requirements specified in the agreement. The actual operating conditions are as follows: (1) Processing capacity: 380~400 t/h, exceeding 95% of the design value. (2) After the system was put into operation, the dissolved oxygen level in the deoxygenated water was 3–4 μg/l, which is more than 42.8% higher than the design requirement. (3) The heat recovered from the condensate water is 3,600–4,000 kW, which is more than 20% higher than the design requirement. (4) Other indicators: nitrogen consumption is approximately 11 Nm3/h, and power consumption is approximately 20 kW. Overall effect: It helps enterprises save a total of 6,111 tons of standard coal per year.
It helps enterprises save a total of 6,111 tons of standard coal per year. How much to invest