Hebei Jisheng Environmental Engineering Co

Introduction to denitrification technology of denitrification equipment
At present, the main denitrification technologies used in industry are and. The core of denitrification technology is to use the oxidation-reduction reaction to occur at a lower reaction temperature (°C) under catalyst conditions. The denitrification technology uses the oxidation-reduction reaction to occur at high temperature (°C). The preparation includes ammonia water, liquid ammonia, urea and ammonia-containing raw materials.
Denitrification technology
Denitrification technology has the advantages of low reaction temperature and high denitrification efficiency, and has become the main method of control. The catalyst is the core of the technology, and the performance of the catalyst directly affects the removal effect. However, the technology has the following shortcomings
The catalyst is easily poisoned, which increases the instability of the system
The catalyst is prone to clogging, affecting the boiler output
The construction cost of the catalyst accounts for ~ of the entire denitrification system, among which Operation also accounts for the total operating cost.
Denitrification mainly involves injecting an amino reducing agent into the temperature window at the top of the furnace (~℃) without the need for a catalyst, and uses the selective reduction reaction released by the reducing agent to turn the gas in the flue gas into harmless water.
The technical denitrification rate is medium, no catalyst is needed, the operating cost is low, and the construction period is short. It is suitable for the denitrification transformation of small and medium-sized boilers and various kilns.
There are the following problems in the process: Spraying ammonia or urea aqueous solution into the reaction zone will cause a sudden and significant cooling of the high-temperature reaction zone, and the temperature in each area of the reaction zone will be uneven, resulting in low denitrification efficiency. Currently, the general The denitrification efficiency is only 1, and it affects the combustion efficiency in the furnace. (Huaneng Laiwu Power Plant dismantled the denitrification device).
At present, cement plants generally use outsourced ammonia denitrification technology, which has many disadvantages
Ammonia is a hazardous chemical and requires registration for transportation and storage. Once the leakage causes harm, the loss will be greater
The ammonia content in industrial ammonia water is generally not greater than 100%, that is, the transportation volume is water, which causes inconvenient transportation and limited storage, thus increasing the purchase cost
When water is used, it not only lowers the furnace temperature, but also consumes a lot of energy. When adding each ton of ammonia water to the kiln, an additional energy consumption of kilograms of standard coal is required (the latent heat of evaporation and heat capacity of water can be easily estimated)
From some areas He said that ammonia is expensive, which greatly increases the cost of denitration. If the price (content) of ammonia per ton is greater than yuan, it will be higher than the price of urea (urea contains ammonia, and the price is about yuan).
It is recommended to adopt the new technology of urea ammonia production, urea on-site ammonia production technology [patent authorization number], which can make a profit of ~ yuan per ton of urea processed.
When using nitric acid, the amount of ammonia water is large, causing ammonia to escape. The ammonia water and reaction efficiency are poor at high temperatures in the decomposition furnace. The molar ratio of / is generally