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Aluminum hydroxide roasting furnace denitration system and process for extracting ammonia by utilizing coal gas condensate water

A technology of aluminum hydroxide and condensed water is applied in the field of denitration system of aluminum hydroxide roaster, which can solve the problems of low energy recovery and utilization rate, and achieve the effects of low cost, lower production cost and lower cost.

Pending Publication Date: 2020-12-04
HENAN KDNEU INT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides an aluminum hydroxide roasting furnace denitrification system and process for extracting ammonia by using gas condensed water to solve the problem of low energy recovery and utilization rate in the existing medium roasting process

Method used

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  • Aluminum hydroxide roasting furnace denitration system and process for extracting ammonia by utilizing coal gas condensate water

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Embodiment 1

[0038] see figure 1 , which is a structural schematic diagram of an aluminum hydroxide roaster denitrification system using gas condensate to extract ammonia in an embodiment, an aluminum hydroxide roaster denitrification system that utilizes gas condensate to extract ammonia in the present invention, used for hydrogen oxidation The nitrogen oxides produced during the aluminum roasting process are denitrified, mainly including ammonia distillation tower 5, condenser 7, ammonia injection unit, first cyclone preheater 1, dust collector 2, flue gas waste heat exchanger 3 , flash tank 4 and other devices.

[0039] The ammonia distillation tower 5 is connected with the coal gas unit through pipelines, and is used to heat the coal gas condensed water transported from the coal gas unit; in this embodiment, it also includes a heat exchange unit for preheating the coal gas condensed water The heat exchange medium pipe of the heat exchanger is connected to the outlet of the still liqui...

Embodiment 2

[0048] A denitrification process of an aluminum hydroxide roaster using gas condensed water to extract ammonia, comprising the following steps:

[0049] (1) The coal gas condensate from the coal gas unit is mixed with hot steam to obtain the mixture of ammonia and water vapor and the kettle liquid; in this step, the device for mixing the gas condensate and hot steam is steam Ammonia tower, the internal control temperature of the ammonia distillation tower is 100°C, the pressure is 10kPa, the top of the ammonia distillation tower is controlled at a temperature of 90°C, and the pressure is 8kPa, and the ammonia in the gas condensate is obtained by controlling the temperature and pressure;

[0050] (2) After the mixture of ammonia and water vapor is collected and distributed, it is sprayed into the roaster for the denitration reaction of the combustion products in the roaster. The denitrification reaction is carried out at 950°C-1000°C, that is, the Is the SNCR reaction, ammonia ...

Embodiment 3

[0055] Using the denitrification system and process provided by the present invention, taking a 1550t / d roasting furnace as an example, its flue gas volume is 150000Nm 3 / h, the reaction molar ratio of ammonia after gasification to the initial NOx of the flue gas is 0.6:1, and the NOx content of the flue gas before purification is 400mg / m 3 , the NOx content of the purified flue gas is ≤50mg / m 3 , the denitration efficiency using the denitration process provided in this embodiment can reach more than 85%.

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Abstract

The invention belongs to the technical field of aluminum hydroxide roasting, and particularly relates to an aluminum hydroxide roasting furnace denitration system and process for extracting ammonia byutilizing coal gas condensate water. The system comprises an ammonia still, a condenser, an ammonia water injection unit, a first cyclone preheater, a dust remover, a flue gas waste heat exchanger, aflash tank and other devices which are connected in sequence, wherein ammonia distillation of the coal gas condensate water is combined with denitration of the roasting furnace, ammonia in the coal gas condensate water is extracted to serve as a denitration reducing agent of the roasting furnace, a reducing agent does not need to be purchased, and the production cost of enterprises is reduced; waste heat of roasting flue gas is used for ammonia distillation, new steam does not need to be consumed, the cost is low, volatile harmful substance ammonia in condensate water is removed while ammoniais extracted, and the method has the advantages of saving energy, protecting the environment and reducing the cost.

Description

technical field [0001] The invention belongs to the technical field of aluminum hydroxide roasting, and in particular relates to an aluminum hydroxide roasting furnace denitrification system and process for extracting ammonia by using gas condensed water. Background technique [0002] The aluminum industry has an extremely important position and role in my country's national economy and social development. Aluminum hydroxide roasting is the last process in the alumina production process, which determines the output, quality, energy consumption and pollutant discharge of alumina in the production process. important part of. At present, my country's aluminum hydroxide roasting technology widely adopts gaseous suspension roasting furnace. In the roasting furnace, the fuel air is burned to generate high-temperature flue gas, and the high-temperature flue gas heats the aluminum hydroxide material to complete the dehydration and partial crystal phase transformation process to form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/56C01C1/10B01D45/16
CPCB01D45/16B01D53/56B01D53/76B01D2251/2062B01D2258/0283C01C1/10Y02P20/10Y02P20/129
Inventor 智乐乐王磊朋张秀芳王亚勤王凯谢培涛李威李晓峰李金超刘荟鑫
Owner HENAN KDNEU INT ENG