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System and method for producing food-grade carbon dioxide from lime kiln tail gas

A carbon dioxide and lime kiln technology, applied in chemical instruments and methods, separation methods, production of bulk chemicals, etc., can solve the problems of ineffective and rational utilization of resources and great environmental hazards, and achieve improved competitiveness, increased benefits, and cost savings Effect

Active Publication Date: 2017-04-12
SHANDONG CITIC CALCIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide a method for producing food-grade carbon dioxide from lime kiln tail gas, so as to solve the problem that lime kiln tail gas is directly discharged without recycling, which is harmful to the environment and cannot effectively and rationally utilize resources

Method used

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  • System and method for producing food-grade carbon dioxide from lime kiln tail gas
  • System and method for producing food-grade carbon dioxide from lime kiln tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 - Preparation of food-grade carbon dioxide:

[0033] A. Lime kiln exhaust gas from outside the boundary, with a gas volume of 9000 Nm 3 , mass percentage content 22%, pressure at 3 kPa, temperature 32 ℃, after entering the water ring vacuum pump P102 to pressurize to 50 kPa, after dehydration, sent to the carbon dioxide absorption tower T102, the CO in the tail gas 2 Absorbed and dissolved in ethanolamine solution (MEA) solution;

[0034] B. The MEA rich liquid treated from the bottom of the absorption tower T102 is introduced into the rich liquid pump P106, pressurized to 0.6 MPa, and then sent to the poor-rich liquid heat exchanger E103 to raise the temperature to 95 °C and enter the top of the carbon dioxide regeneration tower T103, and the bottom of the regeneration tower T103 Set a reboiler E105 to use steam heating, control the temperature of the tower tank at 120 ℃, 0.15MPa, the temperature of the tower top at 95 ℃, 0.12 Mpa; the flow rate of the rich ...

Embodiment 4

[0042] Embodiment 4-preparation of food grade carbon dioxide:

[0043] A. Lime kiln tail gas, gas volume 15000Nm 3 , the content is 25%, the pressure is 4 kPa, the temperature is 36 ℃, after entering the water ring vacuum pump P102 to pressurize to 52kPa, after removing water, it is sent to the carbon dioxide absorption tower T102, the CO in the tail gas 2 Absorbed and dissolved in MEA solution;

[0044] B. The MEA rich liquid treated at the bottom of the absorption tower T102 is introduced into the rich liquid pump P106, pressurized to 0.62 MPa, and then sent to the poor-rich liquid heat exchanger E103 to raise the temperature to 100 ℃, enter the top of the carbon dioxide regeneration tower T103, and the bottom of the regeneration tower T103 Set a reboiler E105 to use steam heating, control the temperature of the tower bottom at 125 °C, 0.17MPa, and the temperature of the tower top at 100 °C, 0.14MPa. The flow rate of the rich solution pump (P106) is 85m 3 / h.

[0045] C....

Embodiment 7

[0052] Example 7 - Preparation of food-grade carbon dioxide:

[0053] A. Lime kiln tail gas, gas volume 13000Nm 3 , the content is 24%, the pressure is 5 kPa, the temperature is 40 ℃, after entering the water ring vacuum pump P102 to pressurize to 48kPa, after removing water, it is sent to the carbon dioxide absorption tower T102, the CO in the tail gas 2 absorbed and dissolved in MEA solution,

[0054] B. The MEA rich liquid treated from the bottom of the absorption tower T102 is introduced into the rich liquid pump P106, pressurized to 0.58 MPa, and then sent to the poor-rich liquid heat exchanger E103 to raise the temperature to 105 °C and enter the top of the carbon dioxide regeneration tower T103, and the bottom of the regeneration tower T103 Set a reboiler E105 to use steam heating, control the temperature of the tower bottom at 130°C, 0.13MPa, and the temperature of the tower top at 105°C, 0.10MPa. The flow rate of the rich solution pump (P106) is 75m 3 / h.

[0055]...

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Abstract

The invention discloses a system and a method for producing food grade carbon dioxide through lime kiln tail gases to solving the problems that current lime kiln tail gases are discharged directly without recovery and are large in harm to the environment, and resources cannot be used effectively and reasonably. The system comprises an absorption tower, a rich and lean solution heat exchanger, a rich solution pump and a regeneration tower. The absorption tower is connected with the rich solution pump which is connected with the rich and lean solution heat exchanger, the rich and lean solution heat exchanger is connected with the regeneration tower, a reboiler is arranged at the bottom of the regeneration tower, and the top of the regeneration tower is connected with a regeneration gas condenser which is connected with a gas-liquid separator. By means of the system and the method, a low-pressure decarbonization technology is adopted, so that the lime kiln tail gas carbon discharging is reduced effectively; besides, food grade carbon dioxide is purified, so that environment-friendly and resource-saving economic development requirements are met; a recovery regeneration unit is added, so that deterioration of the MEA solution is prevented.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a system and a method for producing food-grade carbon dioxide from lime kiln tail gas. Background technique [0002] Carbon dioxide is a chemical raw material with a wide range of uses. It is widely used in the rapid freezing and preservation of various beverages and foods, welding protective gas, greenhouse gas fertilizer, tobacco expansion agent, supercritical extraction agent, etc., as a large amount of chemical carbon source Used in the production of urea, carbonates, polycarbonates, aspirin, and synthetic methanol, and is a major greenhouse gas. [0003] The existing literature discloses the method of using the waste heat of lime kiln tail gas for the production of concrete blocks, but it does not make reasonable use of the CO in the tail gas 2 . Contents of the invention [0004] The purpose of the invention is to provide a system for producing food-grade ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/18C01B32/50
CPCY02P20/54
Inventor 闫吉超张士林袁鹏程
Owner SHANDONG CITIC CALCIUM IND CO LTD
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