Method for automatically purifying and recycling water discharged from dry quenching water seal system

Abstract

The invention relates to a method for automatically purifying and recycling water discharged from a dry quenching water seal system. The water discharged from the dry quenching water seal system is collected and then fed into a purifying water tank for automatic purification treatment, and fed back to the dry quenching water seal system by means of a booster pump afterwards for cyclic utilization. The purifying water tank comprises a water tank, the booster pump, an electric water replenishing valve, and a water tank liquid level meter. The top of the water tank is sealed, and a water inlet pipe is arranged at one side of the water tank, while a water outlet pipe is arranged at the other side of the water tank. The interior of the water tank is sequentially divided into first, second, third and fourth areas by a first tank partition plate, a baffle plate, and a second tank partition plate along the water flow direction, and a folded line-shaped water flow channel is formed; a water replenishing pipe and an overflow pipe are also arranged at the same side to the water outlet pipe; the booster pump is arranged on the water outlet pipe; the electric water replenishing valve is arranged on the water replenishing pipe; the water level in the purifying water tank is monitored by the water tank liquid level meter. Interlocked control over the water tank liquid level meter, the booster pump and the electric water replenishing valve is achieved by means of a control system. The method for automatically purifying and recycling water discharged from the dry quenching water seal system is capable of realizing cyclic utilization of water discharged from a dry quenching process and achieving the purposes of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of coke dry quenching production, in particular to a method for automatic purification and recycling of drainage in a coke dry quenching water sealing system. Background technique [0002] CDQ is an important technology and process for energy saving and emission reduction in the iron and steel industry. It uses inert gas and red coke to perform gas-solid phase heat exchange in the CDQ furnace to extinguish coke. There are three water seal systems for CDQ, which are the water seal of the CDQ furnace mouth, the water seal of the pre-storage chamber release device, and the water seal of the discharge device of the primary dust collector. [0003] At present, the water used in the CDQ water sealing system is fresh industrial water, and the water discharged from the water sealing system is not recycled and directly discharged to the sewage system. According to statistics, the sum of the water consumption of thre...

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Problems solved by technology

According to statistics, the sum of the water consumption of three water-sealed systems for coke CDQ in a production enterprise is 4.6m 3 / h, the annual water consumption exceeds 40,000 tons of water, and this part of the water is not recycled, resulting in considerable waste of water resources

[0004] After research, we found that the drainage of the CDQ water seal system can be reused as long as it is properly purified by sedimentation, but there is no recycling method involving this part of the process drainage.

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