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High-activity kalium group solid absorbing agent for removing CO2 in flue gas and preparation method thereof

An absorbent and high-activity technology, applied in the field of flue gas purification, can solve the problems of adverse effects of active components, poor mechanical properties of diatomite, and poor regeneration performance of absorbents, and achieve easy automation, low price, and stable performance Good results

Inactive Publication Date: 2008-09-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, sodium carbonate and monoclinic potassium carbonate carbonation rate of reaction are low, and monoclinic system potassium carbonate is through 100min, and transformation rate is less than 10%
Among the support materials used, magnesium oxide, aluminum oxide and CO 2 The reaction produces by-products, which make the regeneration performance of the absorbent poor; zirconia, titanium dioxide and molecular sieves are expensive; diatomite has poor mechanical properties
The use of binder materials can adversely affect the active ingredient

Method used

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  • High-activity kalium group solid absorbing agent for removing CO2 in flue gas and preparation method thereof

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Effect test

preparation example Construction

[0038] The preparation method of absorbent is completed through five steps:

[0039] The first step, the preparation of potassium bicarbonate solution. Weighing potassium bicarbonate with a content of 20-50% of the total mass of the absorbent, and dissolving it with excess water;

[0040] In the second step, the active ingredient is mixed with the carrier. Weigh granular coal-based activated carbon, wood activated carbon, or coarse-pore silica gel with a content of 50-80% of the total mass of the absorbent and a diameter of 0.3-0.8 mm, put it into a potassium bicarbonate solution, and stir on a stirrer for 8- 12h;

[0041] The third step is drying. Let the absorbent after stirring and mixing stand for 10-30 minutes. After the solid particles settle, remove excess liquid and dry at a temperature of 70-110°C;

[0042] The fourth step is roasting. Keep the dried absorbent at a temperature of 300-400°C for 2-3 hours;

[0043] The fifth step is to sieve. Sieve the roasted sa...

Embodiment 1

[0046] Weigh 500kg of potassium bicarbonate and pour it into the mixer container, pour water into the container, and stir at the same time to completely dissolve the potassium bicarbonate; weigh 1000kg of granular woody activated carbon with a diameter of 0.35-0.45mm and pour it into the potassium bicarbonate solution and stir 10h, make it fully mixed; let the absorbent after stirring and mixing stand for 30min, after the solid particles settle, remove the excess liquid, pour the solid mixture into the heating furnace, set the temperature in the furnace to 90-105°C, and dry for 1h; Then raise the furnace temperature to 300°C-400°C, keep the temperature for 2 hours for roasting; sieve the roasted samples, and keep the samples between 0.35-0.45mm.

Embodiment 2

[0048] Weigh 500kg of potassium bicarbonate and pour it into the mixer container, pour water into the container, and stir at the same time to completely dissolve the potassium bicarbonate; weigh 1000kg of granular coal-based activated carbon with a diameter of 0.3-0.4mm and pour it into the potassium bicarbonate solution Stir for 10 hours to make it fully mixed; let the absorbent after stirring and mixing stand for 30 minutes, after the solid particles settle, remove excess liquid, pour the solid mixture into the heating furnace, set the temperature in the furnace to 90-105°C, and dry for 1 hour ; Then raise the furnace temperature to 300°C-400°C, keep the temperature for 2 hours for roasting; sieve the roasted samples, and keep the samples between 0.3-0.4mm.

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Abstract

The invention provides a highly active potassium base solid absorbent for CO2 in the process of removing flue gas and a preparation method thereof. The solid absorbent takes hexagonal crystal system potassium carbonate as the active component, coal activated carbon or wood activated carbon or silochrom as a carrier; and the solid absorbent is made by a method of impregnation. The materials required by the absorbent is chemical medicine and carrier which are cheap and easy to be obtained; the preparation of the absorbent has simple process and low cost, the carbonatation temperature ranges from 60 DEG C to 80 DEG C, while the regeneration temperature ranges from 100 DEG C to 200 DEG C, and the absorbent belongs to a low-temperature absorbent. Under the temperature, the absorbent is not easy to lose activity, and can maintain a higher transformation ratio after multiple circulations. The highly active potassium base solid absorbent for CO2 in the process of removing flue gas and the preparation method provide a key technology for the application of the technique about removing the CO2 by a dry method for an alkali metal base absorbent and has a wide application prospect.

Description

technical field [0001] The invention relates to a method for removing CO in flue gas in the technical field of flue gas purification 2 Potassium-based solid absorbent and preparation method thereof. Background technique [0002] Global warming has become an environmental issue of great concern. It is predicted that the global average temperature will continue to rise by 1.4°C to 5.8°C between now and 2100 if active measures to reduce greenhouse gas emissions are not taken. adversely affect people's lives. With the "Kyoto Protocol", the world's first legally binding, aimed at reducing CO emissions 2 With the formal entry into force of the international agreement to prevent global warming, China will also undertake the obligation to reduce greenhouse gas emissions after 2012. my country CO 2 emissions have already ranked second in the world, and with the development of the national economy, CO 2 China's emissions are rapidly rising, and it will inevitably become the focu...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01D53/04B01D53/62B01D53/81
CPCY02C10/08Y02C10/04Y02A50/20Y02C20/40
Inventor 陈晓平赵传文赵长遂梁财
Owner SOUTHEAST UNIV
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