Search
Post Requirements
Post Requirements
Product information
Technical Background
Coking production is a typical process of energy reprocessing and thermal energy recycling, with coke and coking gas as its main energy products. During the coking process, a significant proportion of the sensible heat output from the coke oven is carried away by raw coke oven gas, making it a key area for waste heat and energy recovery in coke ovens. Traditionally, a large amount of 70°C to 75°C circulating ammonia water is sprayed to reduce the temperature of raw coke oven gas. However, this method not only wastes the sensible heat of raw coke oven gas but also increases water consumption.
Technical Development Journey
Early Attempts: In the 1970s, companies such as Shougang and Taiyuan Iron and Steel began adopting jacketed riser technology. The heat carried by raw coke oven gas was absorbed by cooling water in the jacket, causing the water to vaporize and produce steam, thereby recovering thermal energy. However, this method suffered from issues such as weld cracking, water leakage, and steam leakage. After several years of operation, it was discontinued due to concerns regarding system safety and stability, as well as operating costs.
Stagnation and Redevelopment: The application of coke oven riser vaporization cooling devices in China has experienced a cycle of development, stagnation, redevelopment, and stagnation again. During this period, research focused on technologies such as thermal oil jacketed tubing, heat pipes, boilers, and semiconductor thermoelectric power generation.
Breakthrough in New Technology: In recent years, with the gradual enhancement of energy-saving awareness among domestic enterprises and improvements in technological levels, a new type of coke oven riser raw coke oven gas waste heat utilization technology—distributed waste heat recovery technology (medium bath type)—has developed rapidly. This technology uses thermal oil as the heat exchange medium and successfully addresses the three major challenges faced in raw coke oven gas waste heat recovery: tar deposition, leakage, and dry burning, achieving efficient recovery and utilization of waste heat resources.
Technical Principles and Characteristics
Technical Principles: Distributed waste heat recovery technology transfers the heat of raw coke oven gas to thermal oil through a riser heat extraction device. The thermal oil, during its circulation, transfers the heat to the steam-water system, generating steam or being used in other coking processes. The system includes a raw coke oven gas system, a steam-water system, a heat medium system, a nitrogen sealing system, a drainage system, a venting system, and a control system.
Technical Characteristics:
Using thermal oil as the heat transfer medium, with a maximum operating temperature of up to 345°C, it can produce high-quality steam at 3.82 MPa and below 300°C, making the steam of higher quality and more versatile in application.
Both the inner and outer cylinders of the riser heat extraction device operate under atmospheric pressure, reducing the risk of leakage.
High-temperature thermal oil can be transported over long distances and directly used in coking processes such as coal moisture adjustment or ammonia distillation, enabling direct and efficient heat utilization.
The thermal oil remains stable in liquid form during circulation, without vaporization, scaling, or localized steam blockage issues.
Steam-water drainage is concentrated within the thermal oil superheater and thermal oil evaporator, reducing the requirements for feedwater quality.
Real-time monitoring of the inlet and outlet manifold temperatures of the thermal oil allows for effective control of the inner wall temperature of the riser and the outlet temperature of raw coke oven gas.
