Ammonia-chemical-chain-cycle-based carbon dioxide capture and conversion method

A carbon dioxide and chemical chain technology, applied in chemical instruments and methods, inorganic chemistry, separation methods, etc., can solve problems such as instability, unrecoverable carbonation products, large ammonia water, etc., and achieve the effect of saving costs

Inactive Publication Date: 2011-07-06
上海交通大学中原研究院
View PDF4 Cites 35 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using ammonia water to absorb CO in flue gas 2 Emission reduction has the following disadvantages: firstly, the method needs to consume a large amount of ammonia; secondly, the produced NH 4 HCO 3 Although it can be used as an agricultural fertilizer, NH 4 HCO 3 Unstable, easy to decompose and volatilize, resulting in the captured carbon dioxide in NH 4 HCO 3 Re-released into the atmosphere when used as fertilizer (Kim et al., Energy Procedia, 2009 757-762.)
However, due t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ammonia-chemical-chain-cycle-based carbon dioxide capture and conversion method
  • Ammonia-chemical-chain-cycle-based carbon dioxide capture and conversion method
  • Ammonia-chemical-chain-cycle-based carbon dioxide capture and conversion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use air in the laboratory to prepare a continuous flow of mixed gas with a carbon dioxide concentration of 20%, and its flow rate is 2m 3 / h, use ammonia solution with a concentration of 10% as the carbon dioxide absorption liquid, and carry out gas-liquid countercurrent contact absorption in a packed tower with a diameter of 50mm, and the solution will gradually and finally be converted into a saturated ammonium bicarbonate solution, accompanied by a small amount of bicarbonate ammonium crystals.

[0036]Utilize 250mL of ammonium chloride solution with a concentration of 40%, put it into a 500mL ground-mouth conical flask, add 100g of blast furnace slag, wherein the calcium content (by weight of calcium oxide) is about 46%. Use a heater with magnetic stirring to heat while stirring, and finally control the leaching temperature at 90-100°C and control the pH in the range of 5.0-6.0. The overflowing ammonia gas is absorbed by a gas absorption bottle filled with water; A...

Embodiment 2

[0039] The capturing of carbon dioxide and the obtaining of ammonium bicarbonate solution are the same as in Example 1, except that the converter steel slag is used instead of the blast furnace water slag for the test. The calcium content of the converter slag used was about 37% by weight of calcium oxide.

[0040] Use 250mL of ammonium chloride solution with a concentration of 30%, put it into a 500mL conical flask, and add 120g of converter steel slag. Use a heater with magnetic stirring, stir while heating, and finally control the extraction temperature at 90-100°C, control the pH in the range of 5.5-6.5, and absorb the overflowing ammonia gas with a gas absorption bottle filled with water; After 1-2 hours of reaction, when the amount of ammonia finally released by the reaction system drops to a very low level, a certain amount of calcium hydroxide solution is also added to adjust the pH to the range of 8-10, so that the ammonia in the liquid phase is relatively low. Relea...

Embodiment 3

[0043] Absorption process is the same as embodiment 1, by controlling the absorption condition (raising the pH value of ammoniacal liquor), the decarburization product obtained by absorption is converted into ammonium carbonate; by implementing the method mentioned in embodiment 1) to the blast furnace slag The calcium and magnesium components are extracted to obtain the corresponding calcium chloride solution;

[0044] Then use ammonium carbonate solution and calcium chloride solution to react, the molar ratio of the two is 1:1, the final products are calcium carbonate and ammonium chloride, after filtration, the recovery rate of calcium is close to 95%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an ammonia recycling method, which belongs to the technical field of steel smelting technologies. The ammonia recycling method comprises the following steps of: absorbing carbon dioxide in flue gas produced in the steel production process through gas-liquid contact of aqueous solution of ammonia in an absorption tower to obtain ammonium bicarbonate or ammonium carbonate; performing extraction treatment on alkaline steel slag by adopting solution of ammonium chloride to obtain solution of calcium chloride or magnesium chloride and ammonia, recovering the ammonia to obtain ammonia water for capturing carbon dioxide, and reacting the solution of calcium chloride or magnesium chloride with the ammonium bicarbonate or the ammonium carbonate to obtain calcium carbonate or basic magnesium carbonate; and finally separating the solution of ammonium chloride for circular extraction of the alkaline steel slag. By the ammonia recycling method, the emission of the carbon dioxide can be reduced and the carbon dioxide is immobilized in the form of calcium carbonate or magnesium carbonate; meanwhile, calcium and magnesium oxides in steelmaking waste slag are recycled, NH3 generated in the whole process flow is circularly used, and the cost is reduced.

Description

technical field [0001] The invention relates to a carbon dioxide emission reduction method in the iron and steel production process, in particular to a carbon dioxide capture and conversion method based on ammonia chemical chain cycle. Background technique [0002] The phenomenon of global warming caused by greenhouse gases produced by burning fossil fuels has been recognized as a global environmental problem. Since 2007, my country's total carbon dioxide emissions have surpassed that of the United States, becoming the world's largest carbon dioxide emitter. It is estimated that by 2020, my country's carbon dioxide emissions will increase by more than 1.3 times on the basis of 2000. This increase is higher than that of the world. The increase in total emissions from 1990 to 2001 was even greater, which has seriously affected my country's international image. According to the statistics of the China Iron and Steel Industry Association, China's current steel output ranks first...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D53/78B01D53/62C01B31/22C01B32/55
CPCY02C10/04Y02C20/40Y02P20/151
Inventor 晏乃强瞿赞
Owner 上海交通大学中原研究院
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap