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,...

AI Technical Summary

Problems solved by technology

However, in the process of producing magnesia, many mining companies now simply discharge the by-products of carbon dioxide into the air after simple dust removal treatment, causing great environmental pressure

In addition, in some mining enterprises, there is also a carbon dioxide capture process, which uses, for example, the high-pressure method (8.0MPa), which is the main bottleneck restricting its development due to the high power consumption of the compressor; another On the one hand, if the low-pressure method (1.6MPa-2.5MPa) is used, the power consumption of the compressor is relatively much smaller, but multiple throttling, expansion and depressurization are required to obtain additional cooling capacity, and there is a large amount of energy loss in the throttling process

[0003] The carbon dioxide gas produced by the processing of magnesite is a high-temperature gas, and directly discharging it into the air will not only cause air pollution, but also waste a large amount of heat source carried in it.

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