Power generation system based on waste heat of rotary kiln by-products

Abstract

The invention discloses a power generation system based on waste heat of a rotary kiln byproduct. The power generation system comprises a gas storage tank, a steam turbine, a generator, a frequency detector, a rotating speed sensor and a controller, wherein the gas storage tank is used for storing high-temperature carbon dioxide gas generated by a rotary kiln in the process of calcining magnesium ores at a high temperature; a controllable valve is arranged at an outlet of the gas storage tank so as to control a gas outflow volume of the gas storage tank; a gas inlet of the steam turbine is connected to the controllable valve so as to receive the high-temperature carbon dioxide gas; the generator is connected to an output shaft of the steam turbine and outputs a voltage along with rotation of the steam turbine; the frequency detector is used for detecting frequency of the voltage output by the generator; the rotating speed sensor is arranged on the steam turbine and is used for detecting a rotating speed of the output shaft of the steam turbine; the controller is used for determining the opening of the controllable valve according to the frequency from the frequency detector and the rotating speed from the rotating speed sensor.

Description

technical field [0001] The invention relates to waste heat power generation technology, in particular to a power generation system which utilizes waste heat of carbon dioxide generated during the calcining of magnesium ore in a rotary kiln to generate electricity. Background technique [0002] my country's magnesite resources are abundant and widely distributed. According to the main reaction formula in the magnesite smelting process, it can be estimated that for every 1 ton of magnesium oxide finished product, about 1.1 ton of high-temperature carbon dioxide gas will be produced. For example, taking the production of magnesium oxide products in Liaoning Province in 2013 as an example, the annual production of magnesium oxide in this province was 7.837×106t. Based on this calculation, 8.661×106t of carbon dioxide gas was produced. It can be seen that the annual carbon dioxide emissions of the magnesite industry are quite huge. However, in the process of producing magnesia,...

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