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Method for performing smoke desulfurization and denitrification by using urea co-production preparation technology

A technology for desulfurization, denitrification, and flue gas, which is applied in the direction of separation methods, chemical instruments and methods, and climate sustainability. It can solve problems such as hazards, waste of resources, and toxicity of cyanuric acid, and achieve low investment and operating costs. Economical Obvious advantages and high efficiency

Inactive Publication Date: 2014-09-03
SHANDONG UNIV
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Problems solved by technology

The above-mentioned patent documents mainly introduce the high-temperature condensation of urea to produce ammonia, which is used for desulfurization and denitrification, but the co-production product cyanuric acid is not specified in detail. Cyanuric acid has certain toxicity and is harmful to humans. At the same time, cyanuric acid Can not be comprehensively utilized, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0061] The invention will be further described below in conjunction with examples, but not limited thereto.

[0062] The raw materials used in the examples are industrial raw materials, and the flue gas SO from thermal power plants 2 The concentration is about 3000mg / m 3 , NO X About 600mg / m 3 .

Embodiment 1

[0064] Heat 960kg of urea at 250°C to generate cyanuric acid and ammonia. The cyanuric acid produced by the reaction is vaporized at 350-400°C, and the untreated flue gas at 300°C is used as a carrier to inject into the untreated flue gas. The injection pressure of cyanuric acid is 50kpa, and the cyanuric acid and SO 2 The molar ratio is 1:1, the reaction temperature is maintained at 800°C, and the reaction is performed for 1s. The reaction product is a sulfur-containing compound. Use a detection analyzer to detect SO before and after treatment 2 Concentration, calculated to give SO 2 The removal rate is above 95%.

Embodiment 2

[0066] Heat 960kg of urea at 250°C to generate cyanuric acid and ammonia. The cyanuric acid produced by the reaction is directly injected into the flue gas to be treated, the injection pressure of the cyanuric acid is 40kpa, and the cyanuric acid and NO X The molar ratio of the reaction is 0.8:1, the reaction temperature is maintained at 950°C, and the flue gas denitrification is performed for 1 second, and the NO before and after treatment is detected by a detection analyzer. X Concentration, calculated NO X The removal rate is over 90%.

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Abstract

The invention relates to a method for performing smoke desulfurization and denitrification by using a urea co-production preparation technology. Ammonia gas generated by the method can be independently used for smoke desulfurization and denitrification, obtained cyanuric acid can also be independently used for smoke desulfurization and denitrification, and the ammonia gas and the cyanuric acid can be combined for simultaneously performing desulfurization and denitrification. The method has the advantages of being simple in operation, increasing the desulfurization and denitrification efficiency, and greatly lowering the desulfurization and denitrification operation cost; the operation cost of the method is lower than that of an existing desulfurization and denitrification method; the economic benefit of the method is remarkable, and the problems of high infrastructure investment, high operation and maintenance cost and complicated operation of an existing desulfurization and denitrification technology are overcome; and the method can be suitable for smoke or tail gas treatment of multiple industrial boilers and industrial kilns.

Description

technical field [0001] The invention relates to a method for flue gas desulfurization and denitrification by using urea cogeneration preparation technology, and belongs to the technical field of air pollution prevention and control. technical background [0002] my country's energy is mainly coal-fired. With the development of my country's economy, the environmental pollution caused by a large amount of energy consumption is becoming more and more serious. Harmful substances such as sulfur dioxide and nitrogen oxides contained in coal-burning flue gas have caused serious air pollution. It is imminent to increase the emission control of sulfur dioxide and nitrogen oxides. [0003] Flue gas desulfurization technology is one of the effective means to control sulfur dioxide and acid rain. According to the state of absorbent and desulfurization products, flue gas desulfurization technology can be divided into three types: wet desulfurization, semi-dry desulfurization and dry de...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/79B01D53/78B01D53/75B01D53/81B01D53/60B01D53/56B01D53/50C07D251/32
CPCY02P20/50
Inventor 朱维群王付燕王倩孙洪志袁爱丽
Owner SHANDONG UNIV
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