Parallel flow heat accumulating type lime kiln production technology based on CO2 accumulation

A production process, regenerative technology, applied in lime production, chemical instruments and methods, inorganic chemistry, etc., to achieve the effect of increasing product added value and eliminating circulation

Active Publication Date: 2015-10-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the existing process, the present invention

Method used

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  • Parallel flow heat accumulating type lime kiln production technology based on CO2 accumulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, based on CO 2 The structure of enriched parallel flow regenerative lime kiln system is as follows: figure 1 As shown, the dust removal device used in the system is a bag filter, and the fuel is pulverized coal. The dust concentration of the flue gas discharged from the exhaust port is ≤50mg / Nm 3 .

[0025] The above parallel flow regenerative lime kiln system is used to produce quicklime (CaO). The daily output of quicklime is 450 tons, 80 production cycles per day, the amount of pulverized coal per production cycle is 240 kg~270kg, and the excess coefficient of combustion air is 1.1~1.4.

[0026] CO-based 2 The enriched parallel flow regenerative lime kiln production process method comprises the following steps:

[0027] (1) In the first combustion cycle, the limestone raw material is transported from the stone silo in front of the kiln to the weighing hopper, and the limestone raw material is weighed by the weighing hopper and then loaded into the...

Embodiment 2

[0040] In this example, based on CO 2 The structure of enriched parallel flow regenerative lime kiln system is as follows: figure 1 As shown, the dust removal device used in the system is a bag filter, and the fuel is pulverized coal. The dust concentration of the flue gas discharged from the exhaust port is ≤50mg / Nm 3 .

[0041] The above parallel flow regenerative lime kiln system is used to produce quicklime (CaO). The daily output of quicklime is 500 tons, 80 production cycles per day, the amount of pulverized coal per production cycle is 265kg~300kg, and the excess coefficient of combustion air is 1.1~1.4.

[0042]CO-based 2 The enriched parallel flow regenerative lime kiln production process method comprises the following steps:

[0043] (1) In the first combustion cycle, the limestone raw material is transported from the stone silo in front of the kiln to the weighing hopper, and the limestone raw material is weighed by the weighing hopper and then loaded into the f...

Embodiment 3

[0055] In this example, based on CO 2 The structure of enriched parallel flow regenerative lime kiln system is as follows: figure 1 As shown, the dust removal device used in the system is a bag filter, and the fuel is pulverized coal. The dust concentration of the flue gas discharged from the exhaust port is ≤50mg / Nm 3 .

[0056] The above parallel flow regenerative lime kiln system is used to produce quicklime (CaO). The daily output of quicklime is 550 tons, 80 production cycles per day, the amount of pulverized coal per production cycle is 290 kg ~ 330 kg, and the excess coefficient of combustion air is 1.1 ~ 1.4.

[0057] CO-based 2 The enriched parallel flow regenerative lime kiln production process method comprises the following steps:

[0058] (1) In the first combustion cycle, the limestone raw material is transported from the stone silo in front of the kiln to the weighing hopper, and the limestone raw material is weighed by the weighing hopper and then loaded int...

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Abstract

The invention discloses a parallel flow heat accumulating type lime kiln production technology based on CO2 accumulation. The parallel flow heat accumulating type lime kiln production technology includes the steps that limestone raw materials are fed into two kiln chambers of a parallel flow heat accumulating type lime kiln; carrier gas is sprayed into the kiln chambers; combustion supporting gas is fed; in a combustion zone of the current kiln chamber, limestone absorbs the heat generated by fuel combustion to be decomposed to generate quick lime and CO2 gas; the quick lime is discharged after being cooled to 80 DEG C to 100 DEG C; cooling gas, the CO2 gas generated by decomposing the limestone and CO2 gas generated by fuel combustion are mixed to enter the other kiln chamber to preheat limestone; flue gas generated by preheating releases heat to the limestone, then the temperature of the flue gas is reduced, the flue gas is exhausted, and CO2 gas with the volume concentration larger than 95% is generated; the parallel flow heat accumulating type lime kiln starts reversing work. By means of the parallel flow heat accumulating type lime kiln production technology, the high-purity CO2 gas is obtained while the high-quality lime is prepared. Compared with an existing technology, circulation of N2 in a system is avoided, the energy used for heating the N2 is saved, and the flue gas is recycled to achieve the aims of increasing the product added value, saving energy and reducing consumption.

Description

technical field [0001] The invention relates to a lime kiln production process, in particular to a CO-based 2 Enriched parallel flow regenerative lime kiln production process. Background technique [0002] In the metallurgical industry, a large amount of CO is produced when the slagging material quicklime is produced 2 . In actual production, the production of 1 ton of quicklime produces more than 1 ton of CO 2 , and about 70 kg of quicklime is needed to smelt 1 ton of steel. In 2014, China's crude steel output was about 820 million tons, and about 57 million tons of quicklime was needed, which produced more than 60 million tons of CO 2 . At present, lime kilns are mostly used to produce quicklime, but CO in the exhaust gas from lime kilns 2 The content is very low, if the CO 2 Enrichment recycling still needs to spend a large part of energy and capital, so most enterprises choose to discharge directly, which has caused a very serious environmental problem. [0003] ...

Claims

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Application Information

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IPC IPC(8): C04B2/10C01B31/20C01B32/50
CPCY02P40/40
Inventor 李宝宽荣文杰王强李林敏孙美佳童岩鹏李一明齐凤升王芳
Owner NORTHEASTERN UNIV
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