High-temperature solid ceramsite sand electric heating experiment device for supercritical carbon dioxide power generation

Abstract

The invention discloses a high-temperature solid ceramsite sand electric heating experiment device for supercritical carbon dioxide power generation. A high-power frequency modulation impact power supply provides power to the high-temperature solid ceramsite sand electric heating experiment device. In the high-temperature solid ceramsite sand electric heating experiment device, a variable frequency motor is fixed above a first channel steel fixing support, and a ceramsite storage device is fixed below the first channel steel fixing support. A first knife switch is fixed on the ceramsite storage device, and the other end of the first knife switch is connected with a positive electrode. A shaft of the variable-frequency motor is connected with a stirrer. Nine heating pipes are arranged in parallel between a pair of electrodes connected with an output end of the high-power frequency modulation impact power supply; a thermocouple arranged on a heating pipe; and the heating pipe and the electrodes are connected through a high-voltage crimping process. The other surface of a positive electrode plate is connected with the first knife switch; and the other surface of a negative electrode plate is connected with a second knife switch. And a ceramsite sand recoverer is positioned below the heating pipes, an upper part is welded with the second knife switch, and a lower part is welded with a third knife switch.

Description

technical field [0001] The invention relates to an electric heating device for high-temperature solid ceramsite sand. Background technique [0002] Supercritical carbon dioxide power generation uses supercritical carbon dioxide as a working medium to convert heat from a heat source into mechanical energy for power generation. Efficient supercritical CO 2 The cycle requires the hot gas turboexpander to operate at higher temperatures and pressures, maintain high efficiency under higher load conditions, and be able to cope with rapid fluctuations in solar heat input while being able to start quickly. Supercritical CO 2 Cycles have applications in solar thermal power generation, cogeneration, nuclear power and fossil fuel power generation. Supercritical CO 2 The Brayton cycle power generation system is an advanced heat-to-power conversion device that uses supercritical CO 2 As a working medium, it works in a closed Brayton thermodynamic cycle. When the temperature of the he...

AI Technical Summary

Problems solved by technology

The working temperature of this experimental device is 1000°C. U.S. Patent No. 4,777,934 discloses an experimental device with particles and compressed air as the heat transfer fluid. The working temperature is 700°C. This experimental device cannot be heated to a higher temperature, and the heating process The heat loss in the medium is relatively large, its structure is complex, and the efficiency is not high

Chinese patent CN102135334A discloses a solid particle air heat absorber based on quartz tubes. Due to the use of quartz tube structures, problems such as uneven flow distribution among quartz tube bundles are difficult to solve

Chinese patent CN102818379A discloses a solid particle air heat absorbing device of a solar thermal power station, which has a large volume, slow heating speed, low efficiency, slow temperature response speed and cannot quickly respond to changes in solar radiation

U.S. Patent US9732986B2 discloses a method of using porous media to slow down the falling speed of solid particles and enhance heat transfer. However, due to the small pores of porous media materials, flowing solid particles are easily blocked inside, resulting in poor fluidity.

European patent 2630219A2 discloses a method that utilizes the flow of solid particles in an opaque metal tube to effectively control particle flow and heat absorption, but this patent uses indirect heat absorption and heat exchange, which is the same as the principle of traditional molten salt heat absorbers. The shortcomings of thermal stress damage and local ablation after uneven heating in the metal tube, and at the same time, the disordered flow of solid particles in the tube can easily cause damage to the inner wall of the metal tube, which affects the service life of the metal tube

Chinese patent CN102679578A discloses a heat absorber for free-falling particles in a quartz tube. The particles transfer heat to the air in the cyclone separator. Consumes a lot of mechanical power

Chinese patent CN105135716A discloses a tubular solid particle experimental device with an insert, because the particle residence time is too long, the heating temperature is too low

Images