Dry quenching boiler blowdown water reuse device and process

Abstract

A CDQ boiler blowdown reuse device and process, the device includes a regular blowdown expander, a continuous blowdown expander, a dry quenching furnace, and also includes a blowdown well, a blowdown pump, and a liquid level gauge, which are installed downstream of the regular blowdown expander Sewage well, the sewage pump is set in the sewage well, the sewage pump is connected to the water seal tank at the entrance of the dry quenching furnace through pipelines, and three pipeline heaters are installed on the connecting pipeline between the sewage pump and the water seal tank, respectively connected to the continuous sewage expansion expander and The steam connection pipe of the deaerator, the steam release pipe of the periodic blowdown expander and the steam release pipe of the blowdown well; a liquid level gauge is set in the blowdown well, and a liquid level gauge is also set in the water seal tank of the CDQ furnace. The invention pressurizes the blowdown water in the blowdown well of the CDQ boiler to the water seal tank of the CDQ boiler, and heats the blowdown water by the steam waste heat of the boiler, preventing the water seal tank from cracking, and effectively realizes dry Recycling and reuse of coke quenching boiler blowdown water.

Description

technical field [0001] The invention relates to a coke dry quenching process system in the fields of coking and metallurgy, and in particular to a recovery and reuse process for coke dry quenching boiler blowdown water used in a dry quenching boiler water seal tank. Background technique [0002] The quality of CDQ boiler feed water is one of the important factors affecting the safety, stability and economic operation of the boiler steam-water system, for example, it may cause fouling, salt accumulation and corrosion in the CDQ boiler steam-water system. In order to make the water quality index of the boiler feed water meet the relevant standard requirements, the raw water must be treated, such as: sedimentation, filtration, hardness removal, desalination, oxygen removal, etc., to ensure the safe operation of the CDQ boiler. Even so, the steam-water system of the CDQ boiler will still produce a certain amount of salt and impurities during operation, which will corrode the hea...

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Problems solved by technology

[0005] The patent document with the application number 201610096544.1 discloses "a boiler sewage treatment device and method for dry quenching system", which is to send the boiler sewage to the water through a fixed discharge expansion vessel, a cooler, a water tank, and a booster pump in sequence. In the sealed tank; this patent realizes the recovery and reuse of boiler blowdown water as the supplementary water for sealing the water seal tank. The temperature difference of the tank is further increased, and the water-sealed tank is easily cracked due to thermal stress

[0006] In addition, the patent document is to install a balance water tank on the platform of the loading device. The water level of the water seal tank is equal to the edge of the overflow port of the water seal tank, and the water flows into the water seal tank by itself. This method will cause water to flow through the water seal tank continuously. overflow out

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