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SNCR (selective non-catalytic reduction) flue gas denitrification method and device utilizing organic/ammonia nitrogen waste liquid

A technology of ammonia nitrogen and waste liquid, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of high denitrification operation cost and waste of agricultural chemical fertilizer resources, and achieve reduction of denitrification operation cost, saving process and cost, The effect of simple structure

Inactive Publication Date: 2015-07-29
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the technical problems of the existing SNCR flue gas denitrification method that has high denitrification operation cost and causes a lot of waste of agricultural chemical fertilizer resources

Method used

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  • SNCR (selective non-catalytic reduction) flue gas denitrification method and device utilizing organic/ammonia nitrogen waste liquid
  • SNCR (selective non-catalytic reduction) flue gas denitrification method and device utilizing organic/ammonia nitrogen waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A SNCR flue gas denitrification method utilizing organic / ammonia nitrogen waste liquid, comprising the step of injecting organic / ammonia nitrogen waste liquid into the high temperature zone of the cement kiln decomposition furnace; Areas in the range of 980°C. Wherein, the high temperature zone refers to the zone where the temperature in the calciner of the cement kiln is preferably in the range of 900-950°C. Control the volume ratio of the injection amount of the organic / ammonia nitrogen waste liquid to the amount of flue gas in the cement kiln decomposition furnace to be 1 × 10 -6 -1×10 -5 . Specifically, a spray gun is used to spray the organic / ammonia nitrogen waste liquid into the high temperature zone of the cement kiln decomposition furnace, the inlet pressure of the organic / ammonia nitrogen waste liquid entering the spray gun is controlled to be 0.35-0.45MPa, and the compressed air pressure entering the spray gun is 0.40-0.50MPa.

[0036] In Example 1, the or...

Embodiment 2

[0040] combine figure 1 As shown, the denitrification device that completes the SNCR flue gas denitration method of the above-mentioned embodiment 1 using organic / ammonia nitrogen waste liquid includes a reductant storage tank 5, a filter group 6, a booster pump 8, a reductant distributor 10, and a mist A spray gun 11, a reductant adjustment tank 14 and a mixer 16 (preferably a static mixer), the outlet of the reductant storage tank 5 is connected to the inlet of the filter group 6, and the outlet of the filter group 6 is connected to the inlet of the filter group 6 The inlet of the booster pump 8 is connected, the outlet of the booster pump 8 is connected to the inlet of the reducing agent distributor 10 through the reducing agent pipeline 9, each outlet of the reducing agent distributor 10 is connected to the atomizing spray gun 11 The inlet connection of the atomizing spray gun 11 is set at the reducing agent inlet position of the cement kiln calciner 12; On the side wall ...

Embodiment 3

[0049] Using the denitrification device of Example 2, the SNCR flue gas denitrification method using organic / ammonia nitrogen waste liquid in Example 1 was used to conduct experiments to test the denitrification efficiency. The details are as follows: the flue gas volume is 3500Nm 3 The combustion system of / h simulates the cement kiln decomposition furnace to carry out the denitrification test of waste water SNCR flue gas. The organic waste water is acrylic acid chemical waste water, its total organic carbon content is 4.09%, and its total carbon content is 4.17%. Flue gas flow rate is 3510m 3 / h, the NOx concentration is 68ppm. Acrylic chemical organic wastewater is sprayed into the 880°C high temperature zone of the cement kiln decomposition furnace, and the amount of acrylic chemical organic wastewater is 5.5L / h. After flue gas denitrification, the NOx concentration is 38ppm, and the denitrification efficiency reaches 45%.

[0050] In this embodiment 3, the volume ratio...

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Abstract

The invention provides an SNCR (selective non-catalytic reduction) flue gas denitrification method and device utilizing organic / ammonia nitrogen waste liquid. The denitrification method comprises the following steps that organic / ammonia nitrogen waste liquid is sprayed into a high-temperature region of a cement kiln decomposing furnace, wherein the high-temperature region is a region, with the temperature range being 860 to 980 DEG C, in the cement kiln decomposing furnace; the mass concentration of organics or ammonia nitrogen in the organic / ammonia nitrogen waste liquid is regulated; the organic / ammonia nitrogen waste liquid is filtered. The denitrification device comprises a reducing agent storage tank, a reducing agent regulating tank, a pressurizing pump, a reducing agent distributor, a spray gun, a mixer, a filter and the like. The denitrification method has the advantages that the organic / ammonia nitrogen waste liquid is used as reducing agents, nitric oxides are reduced into harmless nitrogen gas, water and the like, the goal of using wastes to treat wastes is achieved, and in addition, the process and the cost required by organic / ammonia nitrogen waste liquid treatment are reduced. The denitrification efficiency reaches a valve of 42 percent or a value higher than 42 percent. Meanwhile, the cost of the adopted reducing agents is low, and the operation cost of denitrification operation is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification methods and devices, in particular to an SNCR flue gas denitrification method and device using organic / ammonia nitrogen waste liquid. Background technique [0002] my country is the world's largest cement producer and consumer. In 2012, my country's cement output reached 1.868 billion tons, accounting for more than 60% of the world's total output, causing serious air pollution problems. Statistics show that the national cement industry emitted 3.58 million tons of NOx in 2012, causing serious pollution. [0003] The control methods of nitrogen oxides in cement kilns mainly include low-nitrogen combustion and flue gas denitrification technology. Low-nitrogen combustion technology is a method of controlling NOx emissions during the combustion process. After adopting low-nitrogen combustion technology, the NOx concentration of the exhaust gas at the cement kiln tail is 850mg / m 3 Ab...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/56
Inventor 王凡田刚朱金伟刘宇王洪昌张凡
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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