Abstract: A direct current contactor includes a case and two groups of contact components disposed in the case. Each group of contact components includes two moving contacts connected to each other and two fixed contacts. The direct current contactor further includes a drive system configured to drive the moving contacts to move in a direction close to or away from the fixed contacts, so that the moving contacts are connected to or disconnected from the fixed contacts. The case has an arc-extinguishing cavity. A first baffle in the arc-extinguishing cavity divides the arc-extinguishing cavity into a first arc-extinguishing chamber and a second arc-extinguishing chamber. The contact components are respectively located in the first arc-extinguishing chamber and the second arc-extinguishing chamber. In other words, the two groups of contact components are integrated into two arc-extinguishing chambers of one arc-extinguishing cavity and perform connection/disconnection drive by using a single drive system.

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.

Abstract: A direct current contactor includes a case and two groups of contact components disposed in the case. Each group of contact components includes two moving contacts connected to each other and two fixed contacts. The direct current contactor further includes a drive system configured to drive the moving contacts to move in a direction close to or away from the fixed contacts, so that the moving contacts are connected to or disconnected from the fixed contacts. The case has an arc-extinguishing cavity. A first baffle in the arc-extinguishing cavity divides the arc-extinguishing cavity into a first arc-extinguishing chamber and a second arc-extinguishing chamber. The contact components are respectively located in the first arc-extinguishing chamber and the second arc-extinguishing chamber. In other words, the two groups of contact components are integrated into two arc-extinguishing chambers of one arc-extinguishing cavity and perform connection/disconnection drive by using a single drive system.