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Method and system for denitrification using isocyanic acid gas

A technology of isocyanic acid and gas, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc., can solve the problems that cannot meet the national environmental protection requirements, affect the normal use of the denitrification system, and affect the denitrification effect of the system, reaching the scope of application wide, convenient construction, and low operating costs

Active Publication Date: 2017-04-19
北京环科腾越环保工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, SCR (selective catalytic reduction technology) and SNCR (selective non-catalytic reduction technology) are the two most widely used technologies, but these two technologies cannot meet the new national environmental protection requirements
In addition, the catalyst, the core component of SCR, is particularly prone to poisoning, which seriously affects the normal use of the denitrification system and increases operating costs; SNCR has high requirements for flue gas temperature, and temperature fluctuations will directly affect the denitrification effect of the system; SCR+ The technology used jointly by SNCR has two technical defects, and it also greatly increases the engineering investment

Method used

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  • Method and system for denitrification using isocyanic acid gas
  • Method and system for denitrification using isocyanic acid gas
  • Method and system for denitrification using isocyanic acid gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The method described in this embodiment specifically includes the following steps:

[0040] Deposit the cyanuric acid raw material in the storage device;

[0041] Real-time monitoring of NO gas content in high-temperature flue gas through metering device;

[0042] The feeding device on the storage device injects cyanuric acid raw material into the gasification device according to the detection data of NO gas content and the preset ratio of NO gas content to the weight of cyanuric acid;

[0043] Use gasification device to decompose cyanuric acid at a temperature of 300-400°C to produce isocyanic acid gas;

[0044] The isocyanic acid gas is sprayed into the high-temperature flue gas channel (850-1000°C) with a spray gun device, and reacts with NO gas in the flue gas to generate N2, CO2, H 2 O gas out.

Embodiment 2

[0046] The method described in this embodiment specifically includes the following steps:

[0047] Deposit the cyanuric acid raw material in the storage device;

[0048] Real-time monitoring of NO gas content in high-temperature flue gas through metering device;

[0049] The feeding device on the storage device injects cyanuric acid raw material into the gasification device according to the detection data of NO gas content and the preset ratio of NO gas content to the weight of cyanuric acid;

[0050] Use gasification device to decompose cyanuric acid at a temperature of 300-400°C to produce isocyanic acid gas;

[0051] Use the gas injection adjustment device on the spray gun device to inject isocyanic acid into the high-temperature flue gas channel (850-1000°C) according to the detection data of NO gas content and the preset ratio of NO gas content and isocyanic acid gas injection amount gas, and react with NO gas in the flue gas to generate N2, CO2, H 2 O gas out.

Embodiment 3

[0053] The method described in this embodiment specifically includes the following steps:

[0054] Deposit the cyanuric acid raw material in the storage device;

[0055] Real-time monitoring of NO gas content in high-temperature flue gas through metering device;

[0056] The feeding device on the storage device injects cyanuric acid raw material into the gasification device according to the detection data of NO gas content and the preset ratio of NO gas content to the weight of cyanuric acid;

[0057]Use gasification device to decompose cyanuric acid at a temperature of 300-400°C to produce isocyanic acid gas;

[0058] Use the gas injection adjustment device on the spray gun device to inject isocyanic acid into the high-temperature flue gas channel (850-1000°C) according to the detection data of NO gas content and the preset ratio of NO gas content and isocyanic acid gas injection amount gas, and react with NO gas in the flue gas to generate N2, CO2, H 2 O gas out.

[0059...

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Abstract

The invention discloses a method and a system for denitration by adopting isocyanic acid gas. The method and the system utilize a gasification device for preparing isocyanic acid gas which can react with an NO gas in flue gas, and the isocyanic acid gas is introduced into a high-temperature flue gas channel for chemical reaction to generate N2, CO2 and H2O gases which can be emitted. The method and the system disclosed by the invention achieve the purpose of denitration by adopting the isocyanic acid gas for reacting with the NO compound in the flue gas, after denitration of the flue gas, the NOX emission concentration is less than 50mg / Nm<3>, the denitration rate is above 90%, and the requirement that the NOX super-low emission concentration is less than 50mg / m<3> is met. For the design of an isocyanic acid gas denitration technology system, an automatic adjusting way is adopted, and by monitoring data, the feeding amount of cyanuric acid and the injection amount of the isocyanic acid gas are automatically adjusted to achieve the treatment effect required for complete reaction.

Description

technical field [0001] The invention relates to a method and system for denitrification using isocyanic acid gas. Background technique [0002] With the continuous development of the national economy, environmental protection has become an important issue for sustainable development. The current large-scale atmospheric smog has seriously affected the normal life of human beings. The root cause of the smog is the excessive discharge of pollutants such as sulfur dioxide, nitrogen oxides, and smoke dust. Among them, the annual emission of nitrogen oxides has exceeded 2,000 According to the national emission limit requirements, the concentration of nitrogen oxide emissions must be controlled at 50mg / Nm 3 within. [0003] At present, SCR (selective catalytic reduction technology) and SNCR (selective non-catalytic reduction technology) are the two most widely used technologies, but these two technologies cannot meet the new national environmental protection requirements. In add...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/56
Inventor 孙璞孙天贾战胜廖相喜纪昕孙朔
Owner 北京环科腾越环保工程有限公司
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