Method and technological system for achieving high-efficiency removal and resource utilization of NOx in ultralow temperature smoke

A resource-based, ultra-low temperature technology, applied in the field of air pollutant control, can solve the problems of poor operating conditions and the lack of general applicability of denitrification technology, achieve operating cost savings, obvious advancement and economy, and widen the denitration temperature window. Effect

Inactive Publication Date: 2018-07-24
SHAANXI COAL & CHEM TECH INST
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  • Description
  • Claims
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Problems solved by technology

If NO in flue gas can be achieved at ultra-low temperature (x The denitrification device can be arranged after the flue gas waste heat recovery, dust removal, and desulfurization devices to perform denitrification under relatively clean conditions, so as to solve the problem that the existing denitrification technology does not have universal applicability and the operating conditions are harsh technical problems

Method used

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  • Method and technological system for achieving high-efficiency removal and resource utilization of NOx in ultralow temperature smoke
  • Method and technological system for achieving high-efficiency removal and resource utilization of NOx in ultralow temperature smoke
  • Method and technological system for achieving high-efficiency removal and resource utilization of NOx in ultralow temperature smoke

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Effect test

Embodiment 1

[0068] The flue gas of the power plant is treated. After the flue gas is recovered by waste heat, the exhaust gas temperature is 55°C, and the NO x Contains 600mg / m 3 . The flue gas is denitrated by the fixed bed adsorption process, the denitrification temperature is set at 55°C, and the regeneration temperature is set at 135°C. After treatment, the NO in the flue gas x content down to 43mg / m 3 , meeting the special emission limit requirements in the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011). The high concentration of NO obtained during the regeneration of denitrification materials x into the nitric acid preparation system, with O 2 is an oxidizing agent, H 2 O is a solvent, the reaction temperature is set at 25° C., the reaction time is set at 1 min, and the reaction pressure is set at 0.02 MPa. After chemical reaction and concentration, a nitric acid product with a mass percentage of not less than 60% is obtained.

Embodiment 2

[0070] The flue gas of the power plant is treated. After the flue gas is recovered by waste heat, the exhaust gas temperature is 55°C, and the NO x Contains 600mg / m 3 . The moving bed adsorption process is used to denitrify the flue gas. The denitrification temperature is set at 55°C and the regeneration temperature is set at 135°C. After treatment, the NO in the flue gas x content down to 48mg / m 3 , meeting the special emission limit requirements in the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011). The high concentration of NO obtained during the regeneration of denitrification materials x into the nitric acid preparation system, with O 2 is an oxidizing agent, H 2 O is a solvent, the reaction temperature is set at 25° C., the reaction time is set at 1 min, and the reaction pressure is set at 0.02 MPa. After chemical reaction and concentration, a nitric acid product with a mass percentage of not less than 60% is obtained.

Embodiment 3

[0072] The coking flue gas is treated. After the flue gas is recovered by waste heat, the exhaust gas temperature is 25°C, and the NO x The content is 1500mg / m 3 . The flue gas is denitrated by fixed bed adsorption process, the denitrification temperature is set at 25°C, and the regeneration temperature is set at 105°C. After treatment, the NO in the flue gas x content down to 120mg / m 3 , to meet the requirements of the special emission limits in the "Emission Standards of Pollutants for the Coking Chemical Industry" (GB 16171-2012). Denitrification High concentration of NO obtained during material regeneration x Into the nitric acid preparation system, with air as the oxidant, H 2 o 2 As a solvent, the reaction temperature is set at 55°C, the reaction time is set at 15min, and the reaction pressure is set at 0.9MPa. After chemical reaction and concentration, a nitric acid product with a mass percentage of not less than 60% is obtained.

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Abstract

The invention discloses a method and a technological system for achieving high-efficiency removal and resource utilization of NOx in ultralow temperature smoke. The method comprises the following steps: step 1, a temperature of smoke is reduced to 25 to 75 DEG C after the smoke from an upstream work section passes through a waste heat recovery system; step 2, the cooled smoke is treated, and in the process, the smoke is denitrified at first to make NOx in the smoke to meet a standard, the smoke meeting the standard is discharged, the denitrified material is regenerated to obtain NOx with a higher concentration, and the regenerated denitrified material is repeatedly applied to smoke denitrification; step 3, the NOx with the higher concentration obtained in the step 2 is utilized to preparea nitric acid product. By means of the method disclosed by the invention, high-efficiency removal of the NOx in the smoke can be achieved under the condition lower than 100 DEG C; furthermore, resource utilization of the NOx is achieved; compared with the prior art, a technology of the method has the advantages of obvious advancement and economical efficiency.

Description

technical field [0001] The invention relates to the technical field of atmospheric pollutant treatment, in particular to a method for realizing NO in ultra-low temperature flue gas x A method and process system for efficient removal and resource utilization. Background technique [0002] Nitrogen oxides (NO x ) is a typical air pollutant, which mainly comes from the conversion of fossil energy and the decomposition of organic matter in nature. NO x Not only will it cause environmental pollution such as acid rain and photochemical smog, but it will also pose a persistent threat to the ecological environment on which humans, animals and plants depend. [0003] Flue gas denitrification technology is one of the important research and development directions of air pollutant control technology. After decades of development, medium and high temperature flue gas denitrification technologies have been applied industrially, and the most representative technologies are SNCR and SCR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/73C01B21/40B01D53/56
CPCB01D53/04B01D53/73B01D53/8625B01D2251/102B01D2258/0283B01D2259/40088C01B21/40Y02P20/10Y02P20/129
Inventor 田士东张生军薛其才杜秉霖张红星李克伦王奕晨岳婷婷谭晓婷赵鹤翔殷海龙
Owner SHAANXI COAL & CHEM TECH INST
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