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

A technology for calcining limestone and production process, applied in the field of CO2 zero emission production process and system, can solve the problems of slow development, low concentration and high cost in the field of carbon emission reduction, to overcome the problems of volatility and intermittent, to achieve zero CO2 Emissions, low energy consumption

Pending Publication Date: 2022-04-29
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The fluctuation and interstitiality of solar energy restrict the application of new energy calcined limestone;
[0006] (2) The limestone industry uses a large amount of fossil energy and raw material calcination itself produces a large amount of CO 2 , leading to slow progress in the field of carbon emission reduction;
[0007] (3) CO in the exhaust gas of traditional limestone production process 2 Low concentration, difficult capture, purification and application, high cost

Method used

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  • CO2 zero-emission production process and system for calcining limestone by using solar energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] see figure 1 , this embodiment provides a CO using solar energy to calcinate limestone 2 The zero-emission production system includes a preheater system 4, a calciner 3, a mirror field 1, a thermal energy storage device 2 and a cyclone cooler 5, and the bottom of the penultimate preheater of the preheater system 4 is discharged The mouth is connected with the raw material inlet of the calciner 3, the outlet at the top of the calciner 3 is connected with the inlet of the final preheater of the preheater system 4, and the outlet at the bottom of the final preheater of the preheater system 4 is connected with the The inlet of the cyclone cooler 5 is connected, and the cyclone cooler 5 includes at least one cyclone cylinder; the exhaust gas outlet of the preheater system 4 is connected with the heat collector 2, and the heat collector 2 absorbs the The energy of the mirror field 1, the high concentration CO of the thermal storage 2 2The flue gas output port is connected w...

example 1

[0039] When the solar energy is sufficient, a CO2 that uses solar energy to calcine limestone 2 Zero-emission production process, the steps are as follows:

[0040] (1) Using artificial intelligence technology to make the mirror field 1 automatically track sunlight;

[0041] (2) The solar energy is reflected by the mirror field 1 to the thermal energy storage device 2, and the thermal energy storage device 2 can focus and store energy;

[0042] (3) The concentrated solar energy will collect high-concentration CO 2 The exhaust gas at the kiln tail of the gas is heated and transported to the calciner 3 to provide heat for calcining and decomposing limestone;

[0043] (4) Decomposed high concentration CO 2 The exhaust gas passes through the preheater system 4 to preheat the limestone and returns to the heat collector 2;

[0044] (5) A part of the heat collector 2 with high concentration CO 2 The gas is heated and circulated to the calciner 3 to provide heat, and a part of th...

example 2

[0047] When solar energy storage is insufficient, a CO2 that uses solar energy to calcine limestone 2 Zero-emission production process, the steps are as follows:

[0048] (1) Using artificial intelligence technology to make the mirror field 1 automatically track sunlight;

[0049] (2) The solar energy is reflected by the mirror field 1 to the thermal energy storage device 2, and the thermal energy storage device 2 can focus and store energy;

[0050] (3) The concentrated solar energy will collect high-concentration CO 2 The exhaust gas at the kiln tail of the gas is heated and transported to the calciner 3 to provide heat for calcining and decomposing limestone;

[0051] (4) High concentration of CO decomposed from limestone 2 The exhaust gas passes through the preheater system 4 to preheat the limestone and returns to the heat collector 2;

[0052] (5) A part of the heat collector 2 with high concentration CO 2 The gas is heated and circulated to the calciner 3 to provid...

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Abstract

The invention discloses a CO2 zero-emission production process and system for calcining limestone by using solar energy, and the specific process is as follows: solar energy is reflected to a heat collection and energy storage device through a mirror field, the heat collection and 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 decomposing furnace for calcining and decomposing limestone, and then the limestone is calcined and decomposed. After high-concentration CO2 waste gas generated by limestone decomposition in the decomposition furnace enters a preheater system to preheat limestone, the high-concentration CO2 waste gas returns to the heat collection energy storage device; and the decomposed calcium oxide is cooled to 80-100 DEG C through a cyclone cooler in an independent cold air supply mode. According to the invention, low-energy-consumption, low-pollution and low-emission solar clean energy is used for replacing high-energy-consumption, high-pollution and high-emission traditional energy such as coal, petroleum and the like, and zero emission of CO2 is realized.

Description

technical field [0001] The invention relates to the technical field of environmental protection lime, in particular to a CO 2 Zero-emission production processes and systems. Background technique [0002] At present, calcined limestone mainly adopts calciner, rotary kiln and other technologies. There are also double-chamber kilns and sleeve kilns for the production of metallurgical lime, and the heat is generally provided by fossil energy. 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, the CO in the exhaust gas of the traditional calcined limestone production process 2 The concentration is low, the capture, purification and application are difficult and the cost is high. These inherent conditions make it difficult for the cement and lime industries to redu...

Claims

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Application Information

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IPC IPC(8): C04B2/10C01B32/50C01B3/02C10L1/00F24S50/20F24S60/00
CPCC04B2/10C01B32/50C01B3/02C10L1/00F24S50/20F24S60/00Y02E10/47
Inventor 武晓萍马娇媚李波高为民
Owner TIANJIN CEMENT IND DESIGN & RES INST
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