Yellow phosphorus slag water quenching waste heat recovery device

Abstract

The invention relates to the technical field of thermal engineering, and discloses a yellow phosphorus slag water quenching waste heat recovery device. The yellow phosphorus slag water quenching wasteheat recovery device comprises an electric furnace, a slag discharge port, a chute positioned below the slag discharge port, and a water quenching pool connected with the bottom end of the chute, wherein a yellow phosphorus combustion device and a spray type heat exchanger connected with the water quenching pool through a return pipe and a return pump are arranged at the joint of the slag discharge port and the chute; and the spray type heat exchanger is provided with an induced draft fan used for introducing gas in the combustion device into the spray type heat exchanger. The yellow phosphorus slag water quenching waste heat recovery device has the following advantages and effects that slag is firstly subjected to cold water spray cooling, a large amount of steam is collected through a gas collecting hood and then subjected to waste heat recovery in a steam heat exchanger, and the waste heat recovery efficiency is high; and the spray type heat exchanger can recover heat of hot waterin the water quenching pool, P2O5 can be absorbed while the spray type heat exchanger conducts heat exchange, and the effects of energy conservation and consumption reduction are achieved while pollution control is achieved.

Description

technical field [0001] The invention relates to the technical field of thermal engineering, in particular to a waste heat recovery device for yellow phosphorus slag water quenching. Background technique [0002] In the production process of yellow phosphorus, apatite, quartz and coke are smelted at a high temperature of about 1600°C in an electric arc furnace. When yellow phosphorus is produced, a large amount of high-temperature slag is produced. At present, the slag is usually discharged directly into a water pool for water quenching. The water quenching tank is usually open. After the high-temperature slag enters the water quenching tank, the water generates a large amount of water vapor under the action of heat. The slag also contains yellow phosphorus. When the yellow phosphorus encounters air, it burns to form white phosphorus pentoxide. Smoke, phosphorus pentoxide and water vapor are mixed to form phosphoric acid. If unorganized discharge will cause corrosion to the e...

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Problems solved by technology

[0002] In the production process of yellow phosphorus, apatite, quartz and coke are smelted at a high temperature of about 1600°C in an electric arc furnace. When yellow phosphorus is produced, a large amount of high-temperature slag is produced. At present, the slag is usually discharged directly into a water pool for water quenching. The water quenching tank is usually open. After the high-temperature slag enters the water quenching tank, the water generates a large amount of water vapor under the action of heat. The slag also contains yellow phosphorus. When the yellow phosphorus encounters air, it burns to form white phosphorus pentoxide. Smoke, phosphorus pentoxide and water vapor are mixed to form phosphoric acid. If unorganized discharge will cause corrosion to the equipment of the factory, it will also lead to a bad factory environment and affect the health of the staff.

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