For ammonia-based desulfurization in power plants, is liquid ammonia or ammonia water used?

Is it better to purchase liquid ammonia or ammonium hydroxide?

It is best to use liquid ammonia to reduce wastewater and transportation costs

Is liquid ammonia used directly for desulfurization, or does one need to prepare ammonia solution beforehand?

Is the cost investment for making ammonia at home high? What are the main equipment?

Typical power plants have an \"ammonia preparation unit\", which mainly consists of 2 tanks (a 200 M3 liquid ammonia tank and a 500 M3 ammonia water tank), 2 pumps, as well as pipes, valves, and metering equipment.

Add water and liquid ammonia directly in the tank and mix them together?

The liquid ammonia storage, preparation, and supply system includes a liquid ammonia unloading compressor, ammonia storage tanks, a liquid ammonia evaporation tank, a liquid ammonia pump, an ammonia gas buffer tank, a dilution fan, a mixer, an ammonia gas dilution tank, a wastewater pump, and a wastewater tank. This system provides ammonia for use in the denitration reaction. The supply of liquid ammonia is carried out using liquid ammonia tank trucks; a liquid ammonia unloading compressor is used to transfer the liquid ammonia from the trucks into the ammonia storage tanks. A liquid ammonia pump then transports the liquid ammonia in these tanks to the evaporation tank, where it is vaporized into ammonia gas. A ammonia gas buffer tank is used to regulate the pressure and flow rate of this gas. After that, the ammonia gas is mixed evenly with diluted air in a mixer before being sent to the denitrification system. The ammonia released urgently from the ammonia system is discharged into an ammonia dilution tank, where it is absorbed by water and then sent to a wastewater tank; from there, it is pumped to a wastewater treatment plant for further processing.

Discharge compressor--The selected discharge compressor will be able to meet the requirements under various conditions. The unloading compressor draws ammonia gas out of the ammonia storage tank; after compression, it pushes the liquid ammonia in the tank truck into the liquid ammonia storage tank. An anti-static device for tank trucks must be installed in the discharge compressor area. Ammonia storage tank – The capacity of the tank for storing liquid ammonia is determined based on the consumption rate under BMCR conditions for the number of boilers, assuming 24 hours of operation per day and continuous operation for 5 days under design conditions. The ammonia storage tank is equipped with a superflow valve, a check valve, an emergency shut-off valve, and a safety valve to protect against leaks of liquid ammonia in the tank. The storage tank is also equipped with a thermometer, pressure gauge, level gauge, high-level alarm, and corresponding transmitters that send signals to the denitration control system to trigger an alarm when the temperature or pressure inside the tank becomes too high. The storage tank will be equipped with measures to protect it from solar radiation; industrial water spray pipelines and nozzles are installed around it. When the temperature of the tank body rises too high, an automatic watering system is activated to spray water on the tank body in order to lower its temperature ； The automatic sprinkler system can also be activated in the event of a minor ammonia leak to absorb the ammonia and control ammonia pollution.