CO2 zero-emission production process and system for calcining cement by using solar energy and hydrogen energy

Abstract

The invention discloses a CO2 zero-emission production process and system for calcining cement by using solar energy and hydrogen energy, and the specific process is as follows: the solar energy is reflected to a heat collection energy storage device through a mirror field, the heat collection energy storage device focuses and stores energy, the collected kiln tail waste gas containing high-concentration CO2 gas is heated to 900-1200 DEG C and is conveyed into a decomposition furnace, and the decomposition furnace is heated to 900-1200 DEG C; the limestone is decomposed into calcium oxide, and high-concentration CO2 waste gas generated by decomposition enters a preheater system to preheat the limestone and then returns to the heat collection energy storage device; when the solar energy is sufficiently stored, decomposed calcium oxide is divided into two paths, one part of calcium oxide and auxiliary materials are mixed and enter a rotary kiln to be calcined, fuel of the rotary kiln adopts hydrogen energy, and flue gas discharged out of the kiln is collected through a cyclone; a part of calcium oxide enters the storage tank. According to the invention, solar energy and hydrogen energy clean energy with low energy consumption, low pollution and low emission are used for replacing traditional energy, so that the whole firing system has the effects of energy conservation, consumption reduction and zero emission of CO2 greenhouse gas.

Description

technical field [0001] The invention relates to the technical field of environmental protection cement, in particular to a CO 2 Zero-emission production processes and systems. Background technique [0002] As one of the hard-to-reduce industries, the cement industry CO 2 Emissions account for 7% of total global emissions. It is imperative for cement companies to reduce carbon dioxide emissions, and many cement companies around the world have made great efforts to carry out green production. [0003] At present, the calcined cement mainly adopts the new dry method preheating and pre-decomposing rotary kiln technology, and generally fossil energy provides the heat for calcining at the kiln head and kiln tail. Calcination of limestone produces a large amount of CO 2 The gas mainly comes from two aspects, one is the calcination reaction itself, the decomposition of limestone produces CO 2 Gases, one from the use of fossil fuel combustion to produce CO 2 gas. In addition, ...

AI Technical Summary

Problems solved by technology

[0006] (1) The fluctuation and interstitiality of solar energy restrict the application of new energy calcined limestone;

[0007] (2) The cement industry uses a large amount of fossil energy and the calcination of raw materials itself produces a large amount of CO 2 , leading to slow progress in the field of carbon emission reduction;

[0008] (3) CO in waste gas from traditional cement and lime production processes 2 Low concentration, difficult capture, purification and application, high cost

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