A method of using melamine waste to carry out flue gas denitrification

A technology of melamine and waste, applied in the field of SNCR flue gas denitrification and flue gas denitrification, can solve the problems of high product price, high cost of denitrification, complicated process, etc., and achieve the effect of low economic benefit, simple denitrification process and simplified treatment process

Active Publication Date: 2019-10-18
SHANDONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0015] Aiming at the problem that the commonly used amino SNCR denitrification reducing agent, such as ammonia water, urea, ammonium bicarbonate, cyanuric acid, melamine, etc. are chemical products, the price of the product is high, the cost of denitrification is high, and the use of melamine waste as chemical waste The problem of complex process and high cost for extracting high-value chemical products

Method used

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  • A method of using melamine waste to carry out flue gas denitrification
  • A method of using melamine waste to carry out flue gas denitrification
  • A method of using melamine waste to carry out flue gas denitrification

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Embodiment 1

[0034] Combine melamine waste with NO in flue gas X The mass ratio is 1.01 sprayed into the reactor, the oxygen concentration in the flue gas is 3%, the temperature is controlled at 950°C, and the residence time is controlled at 1.2s. After the reaction, the flue gas is passed into the flue gas analyzer to analyze the NO in the flue gas before and after the reaction. X Concentration, the denitrification rate is 82.32%. The denitrification rate of the existing SNCR technology is mostly lower than 80%. It can be seen that the method adopted in this example can effectively improve the denitrification efficiency of flue gas.

Embodiment 2

[0036] According to the melamine waste and the NO in flue gas X The mass ratio of 2.24 is sprayed into the reactor, the oxygen concentration in the flue gas is 3%, the temperature is controlled at six temperature points of 600°C, 700°C, 800°C, 900°C, 1000°C, and 1100°C, and the residence time is controlled at 1.2s After the reaction, the flue gas is passed into the flue gas analyzer to analyze the NO in the flue gas before and after the reaction X concentration, the resulting flue gas denitrification rate is shown in Table 1:

[0037] Table 1 The denitrification rate of melamine waste flue gas at different temperatures

[0038] temperature / ℃ 600 700 800 900 1000 1100 Denitrification rate / % 95.05 96.07 92.44 94.51 93.19 93.25

[0039] It can be seen from the experimental data that compared with the existing technology, the method adopted in this embodiment can greatly improve the flue gas denitrification efficiency of the SNCR technology.

Embodiment 3

[0041] According to the melamine waste and the NO in flue gas X The mass ratio of 1.402 is sprayed into the reactor, the oxygen concentration in the flue gas is controlled at 2%, 3%, 4%, and 5%, the temperature is controlled at three temperature points of 900°C, 950°C, and 1000°C, and the residence time is controlled at 1.2s, after the reaction, the flue gas is passed into the flue gas analyzer, and the NO in the flue gas before and after the reaction is analyzed X concentration, the resulting flue gas denitrification rate is shown in Table 2:

[0042] Table 2 The denitrification rate of melamine waste flue gas under different flue gas oxygen concentrations at 900°C, 950°C, and 1000°C

[0043]

[0044] It can be seen from the experimental data that compared with the existing technology, the method adopted in this embodiment can greatly improve the flue gas denitrification efficiency of the SNCR technology.

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Abstract

The invention discloses a method for flue gas denitrification by using melamine waste. X The mass ratio is 0.56~3.37, sprayed into the flue at the end of the furnace, so that it is fully mixed with the flue gas at 600~1100 ° C, the residence time is 0.9~1.5 s, the oxygen concentration of the flue gas is 2%~5%, and the NO in the flue gas X react to generate N 2 and H 2 O, the denitrification efficiency can reach 80%~98%. The present invention uses melamine waste for flue gas denitrification, adopts new principles and new processes to solve the problem of flue gas denitrification, and brings beneficial technical effects. At the same time, it uses the beneficial denitrification components in the waste to achieve the same denitrification as chemical products. effect and greatly reduce the cost.

Description

technical field [0001] The invention relates to a method for denitrating flue gas by using melamine waste, and belongs to the technical field of SNCR flue gas denitrification. Background technique [0002] 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. my country is a country where coal is the main energy source. Harmful substances such as soot, sulfur dioxide, and nitrogen oxides contained in coal-fired flue gas The air is seriously polluted. Among them, nitrogen oxides can cause serious air pollution, endanger human health, and can also be transformed into secondary particulate pollutants, which are transformed into one of the main components of smog. At present, my country has carried out large-scale flue gas desulfurization and achieved good results; but flue gas denitrification has not yet been carried out on a large scale. The country has made stricter regulati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56B01D53/83
Inventor 韩奎华高扬王茜路春美胡晓帅李辉
Owner SHANDONG UNIV
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