Coke Oven Flue Gas Waste Heat Boiler

The Coke Oven Flue Gas Waste Heat Boiler is a high-efficiency, energy-saving device specifically developed for the coking industry. It aims to recover and utilize the large amounts of waste heat from medium- and low-temperature flue gas generated during coking production, converting this waste heat energy into usable steam or electricity. This equipment not only significantly reduces energy consumption costs for enterprises but also effectively reduces environmental pollution, making it a key piece of equipment for coking companies to achieve green and low-carbon development. During coking production, processes such as coke oven heating, raw gas cooling, and dry quenching generate large amounts of medium- and low-temperature flue gas at 260℃-300℃. Direct emission of this flue gas not only results in significant energy waste but also exacerbates environmental thermal pollution. Our coke oven flue gas waste heat boiler uses advanced heat exchange technology to reduce the flue gas temperature to 140℃-160℃ before releasing it into the atmosphere, while simultaneously using the recovered heat to generate steam, which can be directly used for production processes, heating, or power generation.

Product Features:
1. High Heat Recovery Efficiency: The boiler's heat recovery efficiency can reach over 85%, reducing the inlet flue gas temperature from 260℃-300℃ to approximately 140℃-160℃, utilizing waste heat to generate steam.
2. Enhanced Heat Transfer Design: The heating surface consists of an economizer section and an evaporator section. The economizer section uses a counter-current arrangement to improve heat transfer temperature and pressure, while the evaporator section uses a co-current arrangement. H-shaped finned tubes are used, with a welding fusion rate of over 98% between the fins and the steel tubes, ensuring a good heat transfer coefficient.
3. Wear-Resistant and Ash-Resistant Design: The H-shaped finned tube heat exchanger uses a parallel arrangement, dividing the flue gas space into several small areas to achieve a uniform flow effect. Compared to staggered bare tube or spiral finned heat exchangers, this design increases the wear life of the tube bundle by 3-4 times. A 6-13mm gap is left between the H-shaped fins to guide airflow and sweep away ash accumulation, providing a self-cleaning function at suitable wind speeds, thereby reducing ash accumulation. 
4. Compact Structure and Low Resistance: The forced circulation design allows for a compact and flexible arrangement of the heating surfaces. The straight channels formed by the H-shaped fins help reduce flue gas resistance, lowering the operating and investment costs of the induced draft fan. Some models utilize membrane wall flue partitions, which increase the heating surface area and enhance the boiler's sealing and compactness.
5. Dew Point Corrosion Protection: By rationally controlling the metal wall temperature of the heating surfaces to avoid the flue gas dew point temperature, a prerequisite for preventing leaks in the heating surfaces. The heat pipe waste heat boiler's arrangement of the heat exchange surfaces in the low-temperature flue gas zone also considers preventing dew point corrosion.
6. Flexible Configuration and Maintenance: The boiler can be customized according to the coking plant's capacity, waste heat parameters, and actual site conditions. The layout (e.g., traditional horizontal or new vertical) can be determined based on requirements. The boiler employs a modular design, allowing for individual replacement of heat pipe elements or needle tube assemblies, facilitating maintenance.
Working Principle: The coke oven flue gas waste heat boiler utilizes a forced circulation design. The steam-water working fluid is driven by feedwater pumps and hot water circulation pumps within the tubes, enabling an unrestricted and compact arrangement of the heating surfaces.
The boiler system mainly consists of two parts: the economizer section and the evaporator section:
1. Economizer Section: Adopts a counter-current arrangement (the working fluid flows in the opposite direction to the exhaust gas). Feedwater absorbs low-grade energy from the exhaust gas, increasing feedwater temperature and steam production.
2. Evaporator Section: Adopts a co-current arrangement. Water passes through the heating surfaces to generate steam, which enters the inlet header and is then introduced into the boiler drum via riser pipes.
The normal operating procedure is as follows: An opening is made before the flap valve in the underground main flue of the coke oven to draw out the hot flue gas (260℃-300℃). After heat exchange and cooling to 140℃-160℃ through the waste heat boiler system, it is discharged into the original chimney by the induced draft fan.