Regeneration method for ferric chloride for denitration

A ferric chloride and denitration technology, which is applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high operating costs, low absorption efficiency, low solubility, etc., and achieve low operating costs, large processing capacity, Simple to use effects

Inactive Publication Date: 2016-05-04
黄立维
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for nitrogen oxides containing more nitric oxide, because the solubility of nitric oxide in the solution is very small, the absorption efficiency is low, the medicament is more expensive, and the operating cost is high.

Method used

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  • Regeneration method for ferric chloride for denitration
  • Regeneration method for ferric chloride for denitration
  • Regeneration method for ferric chloride for denitration

Examples

Experimental program
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Embodiment 1

[0022] Embodiment 1: a kind of fixed bed device schematic diagram of the regeneration method of ferric chloride described denitrification is as figure 1 shown. The ferric chloride regeneration furnace is tubular, with a size of Φ60mm×600mm. About 100g of the solid product after the denitrification reaction is added to the gas-solid reaction tower. The protective inert gas of the regeneration furnace is nitrogen. It is heated by a tubular electric furnace. The heating temperature of the regeneration furnace is respectively At about 75°C, 95°C, 120°C, 150°C, 250°C and 350°C, about 70min, 30min, 15min, 10min, 8min and 6min respectively, the process of releasing nitrogen oxides after the solid product decomposes is basically completed. When the regeneration furnace is cooled to 60°C-70°C, then introduce hydrogen chloride gas with a content of about 1%, 10%, 15% and 30% into the ferric chloride regeneration furnace, and the gas-solid contact time is about 1s-3s. The time is about ...

Embodiment 2

[0023] Embodiment 2: In the above-mentioned embodiment 1, the heating temperature of the regeneration furnace is 120°C, and the reaction time is about 15 minutes. Introduce about 50mL of hydrochloric acid that content is about 5%, 15% and 36% respectively to ferric chloride regenerating furnace, make solid product soak in hydrochloric acid, import the hydrogen chloride gas that content is about 15% to ferric chloride regenerating furnace again, keep The temperature of the regeneration furnace is about 95°C, and the reaction time is about 60 minutes, 40 minutes and 30 minutes respectively, and the iron oxide and oxyferric chloride contained in the solid product are converted into ferric chloride. Other conditions are the same as Example 1.

Embodiment 3

[0024] Embodiment 3: a kind of described regeneration furnace of ferric chloride for denitrification is as the device schematic diagram of ferric chloride solid particle gasification furnace as figure 2 shown. The solid ferric chloride obtained in the regeneration furnace of Example 1 is heated in the regeneration furnace, the heating temperature is about 120-150 ° C, the cooler is a tube type, the diameter is Φ40 mm, and the length is 1000 mm, naturally cooled, and the gas outlet after cooling The temperature is about 60°C-65°C, the protective gas of the regeneration furnace is nitrogen, and the carrier gas is also nitrogen. The diameter of the gas-solid reaction tower is Φ60mm, and the effective contact height of the reaction is about 1000mm. The empty tower is made of 316L stainless steel. The concentration of nitrogen oxides (about 90% nitric oxide) in the gas stream is 500 ppm, oxygen is about 8% by volume, carbon dioxide is about 10% by volume, moisture content is about...

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Abstract

The invention provides a regeneration method for ferric chloride for denitration and belongs to the technical field of air pollution control and environmental protection. The treatment process of the method comprises the steps that ferric chloride solid particles and nitrogen oxide in air flow are subjected to a chemical reaction in a gas-solid reaction tower to generate a solid product, the solid product is guided into a ferric chloride regeneration furnace, in protection atmosphere of inert gas like nitrogen, the solid product is heated after being vacuumized, absorbed nitrogen oxide is released, hydrogen chloride gas is introduced into the ferric chloride furnace further, ferric oxide and ferric oxide chloride in the solid product are converted into ferric chloride, the purpose of regenerating ferric chloride is achieved, nitric acid can be recovered, and the ferric regeneration furnace can be gasification furnace for preparing ferric chloride particles for denitration. The regeneration method has the advantages of being low in investment cost and operation cost, easy to operate, high in treatment efficiency and large in treatment capacity.

Description

technical field [0001] The invention relates to a method for regenerating ferric chloride for denitrification, and belongs to the technical field of air pollution control and related environmental protection. Background technique [0002] Nitrogen oxides (NO) produced by human activities x ) mainly includes NO and NO 2 , of which more than 90% are produced by fuel combustion, followed by industrial processes such as nitric acid production, chemical and pharmaceutical nitration reactions, metal surface and semiconductor processing. NO X It is toxic to humans, and a large amount of nitrogen oxide emissions is also one of the main causes of atmospheric photochemical smog and acid rain. Statistical data in the Bulletin on the State of the Environment in China shows that the contribution of nitrogen oxides in acid rain in my country's cities is increasing, and the nature of acid rain pollution in some places has begun to change from sulfuric acid to nitrate ions (Ministry of E...

Claims

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Application Information

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IPC IPC(8): B01D53/81B01D53/56B01D53/96
CPCB01D53/565B01D53/96B01D2251/60
Inventor 黄立维
Owner 黄立维
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