Importance

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Abstract

Disclosed are a device and a method for producing high-pressure or super high-pressure steam as a byproduct from a maleic anhydride producing device. The device includes a super high-pressure steam drum, a molten salt pump, an oxidation reactor, a regulating valve, molten salt coolers, a switching cooler and a gas cooler. The molten salt pump, the oxidation reactor, the regulating valve and the molten salt coolers are connected. A boiler water buffer device and a boiler water booster pump are arranged between the switching cooler and the gas cooler. The unique design of the boiler water intermediate pressure boosting and the gas cooler in the disclosure makes the gas cooler and the switching cooler very easy to manufacture. Heat can be effectively recovered from process gas to produce high-pressure or super high-pressure steam while accumulation of dust in the process gas is avoided and tar adhesion is easy to clean.

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First Claim