Method for preparing sodium carbonate by supplementing CO2 to flue gas

A technology of flue gas and CO2, which is applied in the direction of chemical instruments and methods, carbonate preparations, alkali metal compounds, etc., can solve the problems of equipment investment and power consumption reduction and shortage, and achieve equipment investment and power consumption reduction, high efficiency Recycling, good economical effect

Active Publication Date: 2014-02-19
CHINA CHENGDA ENG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention is aimed at CO in the production process of soda ash 2 Insufficient problem, aiming to provide a way to use flue gas to supplement CO 2 The

Method used

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  • Method for preparing sodium carbonate by supplementing CO2 to flue gas
  • Method for preparing sodium carbonate by supplementing CO2 to flue gas

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Embodiment 1

[0029] A certain engineering project uses natural gas and brine as raw materials to produce soda ash and ammonium chloride by the combined soda method. There is a problem of insufficient carbon dioxide. The flue gas of the coal-fired boiler is used to supplement carbon dioxide in the engineering design. The carbonization tower adopts the cleaning tower and alkali-making tower group mode. The carbonization tower is a continuous liquid-phase high-efficiency sieve plate carbonation tower. (Both the cleaning tower and the soda-making tower have a high-efficiency sieve plate structure). After cooling down, the temperature is about 40°C, the carbon dioxide content in the flue gas is 12%-13%, and the sulfur content is less than 50ppm. After being pressurized to 0.3MPa and 0.1MPa by the compressor, it enters the bottom of the cleaning tower and the soda making tower respectively. The upper segment, containing high concentrations of CO 2 The decarbonized gas and furnace gas enter the b...

Embodiment 2

[0031] In a certain project, the ammonia-soda method is used to produce soda ash, and a part of calcium carbide waste residue is used to replace lime milk to decompose ammonium chloride. There is a problem of insufficient carbon dioxide. In the engineering design, the flue gas of coal-fired boilers is used to supplement carbon dioxide. The carbonization tower adopts the cleaning tower and soda tower group mode. The carbonization tower is a continuous liquid phase high-efficiency sieve plate carbonation tower. After the flue gas is dedusted, desulfurized, and cooled, the temperature is reduced to about 40 ° C. The carbon dioxide in the flue gas The sulfur content is 10%-12%, and the sulfur content is less than 50ppm. It is pressurized to 0.3MPa and 0.1MPa by the compressor, and enters the bottom of the cleaning tower and the middle and upper sections of the soda making tower respectively, containing high concentrations of CO 2 The kiln gas and furnace gas enter the bottom and mi...

Embodiment 3

[0033] In a certain project, the ammonia-soda method was used to produce soda ash, and there was a problem of insufficient carbon dioxide. The flue gas was used to supplement carbon dioxide in the engineering design. After the flue gas is dedusted, desulfurized, and cooled, the temperature is reduced to about 30°C, the carbon dioxide content in the flue gas is 12%-15%, and the sulfur content is less than 50ppm. It is pressurized to 0.35MPa by the compressor and enters the middle and upper sections of the carbonization tower. Contains a high concentration of CO 2 The kiln gas and furnace gas enter the bottom and middle of the carbonization tower to complete the carbonization reaction, and the CO in the tail gas of the carbonization tower 2 The content is less than 5%. The conversion rate of sodium in the liquid taken out of the carbonization tower can reach 73%-75%.

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Abstract

The invention discloses a method for preparing sodium carbonate by supplementing CO2 to flue gas. The method comprises the following steps: carrying out de-dusting, desulfurizing and cooling on CO2-containing flue gas, increasing the pressure to be 0.05-0.35 MPa, directly filling the flue gas into the middle and the upper part of a sodium carbonate preparation carbonizing tower, producing a carbonation reaction, enabling a reaction product to continue to pass through the lower section of the carbonizing tower to finish the carbonation reaction with high-concentration CO2-containing gas to obtain sodium hydrogen carbonate, and calcining sodium hydrogen carbonate to obtain sodium carbonate. According to the method, during sodium carbonate production, the problem of CO2 deficiency is successfully solved, the equipment investment and the power consumption are greatly reduced, the CO2 emission is reduced, the utilization rate of sodium chloride is high, both the energy consumption and the cost are low, and the economic feasibility is high.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of flue gas produced by burning coal and natural gas, in particular to a technology for producing soda ash by supplementing carbon dioxide with boiler flue gas entering a carbonation tower. technical background [0002] As a large-tonnage chemical raw material, soda ash is widely used in the fields of alkali refining and smelting in the manufacture of glass, soap, petroleum and oil. At present, the production methods of soda ash mainly include trona method, combined soda method and ammonia soda method. Among them, both the combined alkali method and the ammonia-soda method use ammonia, carbon dioxide and sodium chloride as raw materials to artificially synthesize soda ash. In the ammonia-soda method, carbon dioxide is obtained by calcining limestone, and the lime produced by calcining limestone is used to decompose and recover ammonium chloride generated by carbonization reaction...

Claims

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Application Information

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IPC IPC(8): C01D7/00C01D7/18
Inventor 周光耀李瑞峰李育亮
Owner CHINA CHENGDA ENG
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