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Cement kiln system and cement clinker preparation method for realizing zero emission of carbon dioxide

A technology for cement clinker and carbon dioxide, which is applied in the treatment of discharged materials, cement production, carbon capture, etc., can solve the problems of low gas capture efficiency, low concentration, and high system investment and operation costs, and achieve a small system modification workload, Realization of zero discharge and improvement of capture efficiency

Active Publication Date: 2022-06-24
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the defects of the prior art, the present invention provides a cement kiln system and a method for preparing cement clinker to realize zero emission of carbon dioxide, so as to solve the problem of capturing CO after combustion. 2 Technology exists in CO 2 CO capture and purification system 2 The gas capture efficiency is low, and the CO in the flue gas entering the capture purification system 2 Low concentration, high system investment and high operating costs

Method used

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  • Cement kiln system and cement clinker preparation method for realizing zero emission of carbon dioxide
  • Cement kiln system and cement clinker preparation method for realizing zero emission of carbon dioxide
  • Cement kiln system and cement clinker preparation method for realizing zero emission of carbon dioxide

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Embodiment 1

[0061] like figure 1 As shown, the cement kiln system for realizing zero carbon dioxide emission in this embodiment includes a smoke chamber 1, a rotary kiln 2, a cooler 3, a fan 4, a raw meal preheating and pre-decomposition system, a first pipeline assembly and a second pipeline Road components, the raw meal preheating and pre-decomposition system is a conventional raw meal preheating and pre-decomposition system.

[0062] The raw meal preheating and pre-decomposition system communicates with the smoke chamber 1 , the rotary kiln 2 is provided with a first burner 201 , the tail of the rotary kiln 2 communicates with the smoke chamber 1 , and the head of the rotary kiln 2 communicates with the cooler 1 .

[0063] The raw meal preheating and pre-decomposition system includes a decomposition furnace 5 and a cyclone preheater. The cyclone preheater includes a first row of cyclone preheaters and a second row of cyclone preheaters. It should be noted that the row of cyclone prehea...

Embodiment 2

[0109] like figure 2 As shown, the cement kiln system for realizing zero carbon dioxide emission in this embodiment is basically similar in structure to the cement kiln system in Embodiment 1, except that the first waste heat utilization system in this embodiment includes a heat exchanger and a coal grinding device , that is, the first cooling gas of the third channel exchanges heat with the air through the heat exchanger, and the air after heat exchange enters the coal mill for drying, and then is discharged into the atmosphere after being treated with flue gas, and the gas after heat exchange is divided into The two routes enter the first branch pipeline 901 and the second branch pipeline 902 respectively.

[0110] The method for preparing cement clinker by adopting the cement kiln system in this embodiment is the same as that in Embodiment 1.

Embodiment 3

[0112] like image 3 As shown, the cement kiln system for realizing zero carbon dioxide emission of this embodiment is basically similar in structure to the cement kiln system of Embodiment 1, and the differences are as follows:

[0113] 1. The withstand temperature of the middle roller in the cooler 3 is greater than or equal to 900 °C, and the withstand temperature of the middle roller is greater than or equal to 900 °C. The roller is generally located in the front or middle of the cooler 3. At this time, the first cooling gas is divided into two way;

[0114] The first cooling gas of the first path directly enters the rotary kiln as secondary air for fuel combustion;

[0115] The first cooling gas of the second passage enters the decomposition furnace as tertiary air through the tertiary air duct for fuel combustion.

[0116]2. The other end of the fifth branch pipe 905 is mixed with pure oxygen to obtain a mixed gas of pure oxygen and high-concentration carbon dioxide ci...

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Abstract

The invention provides a cement kiln system and a cement clinker preparation method for realizing zero emission of carbon dioxide. The system includes a raw meal preheating and pre-decomposition system, a smoke chamber, a rotary kiln and a cooler; the smoke chamber, the rotary kiln and the cooler are connected in sequence; the raw meal The preheating and pre-decomposition system includes a calciner and a cyclone preheater. The air inlet of the bottom cyclone preheater is connected to the air outlet pipe of the calciner, and the air outlet of the top cyclone preheater discharges low-temperature flue gas; the bottom cyclone preheater The outlet of the outlet is connected to the smoke chamber, and the inlet of the cyclone preheater at the top is used for feeding raw material; the cooler includes a first cooling zone and a second cooling zone, and the inlet of the first cooling zone is fed with pure oxygen and The mixture of high-concentration carbon dioxide flue gas, the air inlet of the second cooling zone is passed into the air. The invention solves the problem of capturing CO after combustion 2 Technology exists in CO 2 CO capture and purification system 2 The gas capture efficiency is low, and the CO in the flue gas entering the capture purification system 2 Low concentration, high system investment and high operating costs.

Description

technical field [0001] The invention belongs to the technical field of cement production equipment, and particularly relates to a cement kiln system and a cement clinker preparation method for realizing zero emission of carbon dioxide. Background technique [0002] CO 2 As a major greenhouse gas, its massive emission aggravates the global greenhouse effect. All countries in the world are generally faced with the arduous task of reducing carbon emissions and mitigating global climate change. In order to better develop the global economy and protect the natural environment, countries around the world have successively formulated strategic goals for carbon emission reduction. In my country, the cement industry has become the second largest CO after the power industry 2 Emission source. According to statistics, the national output of cement clinker in 2018 was about 1.42 billion tons, and the CO 2 Under the technical level of emission of about 0.84 tons, CO 2 Emissions have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/44C04B7/47F27B7/34F27B7/36F27B7/38F27D15/02F27D17/00
CPCC04B7/44C04B7/47C04B7/4476F27B7/34F27B7/36F27B7/38F27D15/02F27D17/004Y02P40/18
Inventor 代中元胡芝娟彭学平陈昌华赵亮
Owner TIANJIN CEMENT IND DESIGN & RES INST
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