Low-moisture coking
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Article 6 on technological progress in the recently issued \"Access Requirements for the Coking Industry\" encourages coking enterprises to adopt low-moisture quenching. Experts, what quenching methods do you use, and what are your insights? (1) Low-moisture quenching can replace the currently widely used traditional spray quenching method. The low-moisture coking quenching process generally uses a high-level water tank for water supply, which allows the water pressure and volume supplied during each quenching operation to remain constant, thereby achieving uniform coking quenching and maintaining stable carbon moisture levels. During the low-moisture quenching process, the quenching water is first sprayed onto the red coke in the quenching car at 40–50% of the normal volume (for about 10–20 seconds) to cool the upper layer of red coke. Afterwards, the quenching water is ejected in a columnar flow at normal volume onto the coke layer, with a large amount of water rapidly passing through the coke layer and reaching the inclined bottom plate of the quenching car. The steam generated as the water flow passes through the red coking layer expands rapidly and rises through the coking layer, quenching the coke inside the furnace from bottom to top. After coking, the moisture content of the coke can be controlled at 2–4%. (2) Secondary quenching is a quenching process developed on the basis of traditional spray quenching, by drawing on the low-moisture quenching technology. Its advantage is that the carbon content in the upper and lower parts of the coking vehicle remains uniform and stable, with the moisture level dapat be controlled between 2.5% and 4%, thereby reducing the coke consumption and heat requirements in ironmaking plants. Unlike traditional spray quenching methods, a high-level water tank is added between the original quenching pump room and the quenching tower, and low-power pumps are used for the quenching water pumps. (3) Stable coking quenching also employs a positioning coking quenching vehicle; by controlling the amount and duration of water sprayed for quenching, the moisture content of the coke can be kept within the range of 3–3.5%, which is similar to the approach used in low-moisture coking quenching. The difference lies in the structure of the coking quenching vehicle and the way in which the quenching water comes into contact with the coke layer.
The design provided to us by the design institute uses a secondary coking-off process. The quenching pump room is equipped with two quenching pumps, one in operation and one as a backup. The opening of the quick-acting solenoid valve connected to the high-level water tank is automatically controlled by an infrared remote control sensor. When the coking quenching vehicle equipped with red coke moves to beneath the coking tower, the quenching process begins. The entire spraying process is carried out in two stages, controlled by a time relay; the spraying time for each stage is set between 90 and 120 seconds to ensure that the red coke is extinguished. The secondary coking quenching process includes a coking quenching pump room, a high-level water tank, a coking quenching tower, coking quenching water spray pipes, dust collection devices, a fine coke sedimentation tank, a clean water tank, a fine coke dewatering station, as well as electric monorail grab cranes, a coke bed, and scraper coke discharge machines. To ensure the efficiency of the quench tower in capturing coke dust, a clean water flushing pump is installed in the pump room to regularly flush the capture device. The quenching tower is 55 meters tall. At its lower part, there are nozzles for spraying quenching water, while at the top there are two layers of baffle-type wooden structures designed to capture the coke dust and water droplets generated during quenching, thereby improving the dust removal efficiency and effectively enhancing the surrounding environment. The length, width, and depth of the fly ash sedimentation tank provide the circulating water containing fly ash with sufficient sedimentation time and speed. It ensures the recycled use of quenching water. To regularly remove the powdered coke from the sedimentation tank, an electric grab with a capacity of 1.5 m3 was selected for this purpose; it picks up the powdered coke at the bottom of the tank at regular intervals and transports it to the dehydration station, where it is dehydrated before being removed from the site.
Dry quenching of coke is now being encouraged, but the old-style wet quenching method can be modified; using quenching with low moisture content is a good option. Let’s support the original poster.
It won’t be long before it’s all changed to dry quenching of coke. Dry quenching of coke 1. Energy saving. 2 Reduce environmental pollution. 3 Improve coke quality. As **environmental regulations become increasingly strict. Coal prices are getting higher and higher. There is less and less coal. The dry quenching technology is increasingly demonstrating its significant economic, social, and environmental benefits for enterprises and society. The only drawback. The cost is too high.
From an economic perspective, does low-moisture coking result in a loss of tons?
Only steel companies are required to use dry quenching for coking, while wet quenching is likely to remain in use for some time yet. Energy conservation has become as important as environmental protection; it won’t be long before new projects are required to undergo not only environmental and safety assessments but also energy assessments. Last edited by Lao Shi on 2008-12-30 00:44]
Dry quenching of coke can save energy, but it has high operating costs and a high likelihood of secondary pollution. Currently, low-moisture coking is **widely used in the West.
Looking at it now, dry coke is still the better choice, as it has better quality.
We also plan to switch from conventional wet quenching to low-moisture quenching in the near future.
The actual moisture level during stable coking is on the high side, with a large amount of powdered coke
If anyone has examples or plans for modifications, we would like to convert it to low-moisture coking as well