Method for increasing concentration of carbon dioxide in tail gas of lime rotary kiln

A lime rotary kiln and carbon dioxide technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve problems such as low carbon dioxide absorption efficiency, low gas purity, corrosion loss, etc., to facilitate popularization and use, and reduce production Cost, effect of reducing gas emissions

Inactive Publication Date: 2020-01-14
HUBEI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: the absorption efficiency of carbon dioxide is low, the purity of the obtained gas is not high, and the adsorbent has a certain corrosion loss to the equipment
The disadvantage is that it is difficult to obtain high-purity carbon dioxide gas, and the gas separation efficiency is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] (1) A single gas-fired lime kiln with a daily capacity of 150 tons of lime, with an exhaust emission of 40,000 Nm 3 / h, the tail gas temperature is 130°C, and the pressure is 4000PaG; it will contain 28% CO 2 , 60%N 2 , 8%H 2 O, 4% O 2 , Dust 30mg / Nm 3 and trace amounts of CO and SO 2 The high-temperature tail gas is passed into the dedusting equipment to treat the dust, and then sprayed through the washing tower, and the tail gas after spraying is passed into the desulfurization tower for desulfurization treatment;

[0036] (2) The tail gas after desulfurization is passed into the absorption tower, and the absorbing liquid in the absorption tower absorbs the carbon dioxide in the tail gas, and the remaining waste gas after absorption is emptied through metering. The rich liquid that has absorbed carbon dioxide gas is pumped to the regeneration tower through the rich liquid pump to expand and decompress to release carbon dioxide.

[0037] (3) The tail gas is coole...

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PUM

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Abstract

The invention discloses a method for increasing the concentration of carbon dioxide in tail gas of a lime rotary kiln. The method is characterized by comprising the following steps: (1) the tail gas of the lime kiln passes through dedusting equipment to remove dust particles; (2) the dedusted tail gas is sprayed through a washing tower, the sprayed tail gas is desulfurized through a desulfurizingtower; (3) the desulfurized tail gas passes through a booster fan to enter a surge flask and then is conveyed into a carbon dioxide absorption tower, alkanolamine in the absorption tower absorbs the carbon dioxide, and the tail gas is metered and then emptied; (4) a carbon-dioxide-absorbed alkanolamine solution is pressurized through a rich solution pump to enter a regeneration tower; (5) the carbon-dioxide-absorbed alkanolamine solution is heated in the regeneration tower to desorb the carbon dioxide, the desorbed carbon dioxide is cooled, dried, analyzed and stored; and (6) a regenerated barren solution is cooled by a barren solution cooler and then pressurized through a barren solution pump to enter an absorption tower, and the carbon dioxide is absorbed again. An enrichment technologyfor the carbon dioxide in the tail gas of the lime rotary kiln brings certain economic benefits for enterprises while according with national industrial structure adjustment and environmental protection.

Description

technical field [0001] The invention relates to the field of calcium carbonate and active calcium oxide production, in particular to a method for enriching and purifying carbon dioxide in tail gas in a lime rotary kiln for secondary utilization. Background technique [0002] After the industrial revolution, due to the extensive use of fossil fuels in human activities, the emission of carbon dioxide has increased dramatically. According to statistics, the CO emitted into the atmosphere from the combustion of various fossil fuels in the world 2 The amount of carbon dioxide reaches 18.5-24.2Gt / a, and carbon dioxide is the main factor leading to the "greenhouse effect", causing serious damage to the atmospheric environment. The "greenhouse effect" has increased the world's average temperature by 0.2-0.69°C in the past 100 years. If relevant measures are not taken to control excessive carbon dioxide emissions, the "greenhouse effect" will become more serious in the future, causi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/50B01D53/62B01D53/78C01F11/18B82Y30/00
CPCB01D53/62B01D53/78B01D2251/80B01D2257/504B82Y30/00C01B32/50C01F11/18Y02P20/10Y02P20/151
Inventor 鲁锋陈坤田键
Owner HUBEI UNIV
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