Technology Features of Desulphuration by Ammonia process

1. Completed Recycling-change the waste to resources, change the hazardous to be beneficial

Ammonia process can convert all the recycled SO2 and ammonia to fertilizer without any wasted liquid or solid, avoiding twice pollution which is a real technology to convert contamination substantial to be resources, meeting the requirement of recycled economy.

2. High value of by- product of the desulphuration process

The running process of desulphuration by ammonia process is also the process of producing ammonia sulfate. Every 1 ton liquid ammonia absorbed will lead to the produce of 2 tons SO2 and 4 tons ammonia sulfate. Generally, the price for liquid ammonia is 2000 RMB per ton, price for ammonia sulfate is 700 RMB per ton, the value of SO2 is around 400 RMB per ton. Therefore, the running cost is relatively low and the more the sulfide content in the coal, the less the running cost will become. The using of low cost high sulfide coal will lead the lower cost of desulphuration at the same time.

3. Save power
The high-activity of the ammonia process desluphuration leads to the lower ratio of the liquid to gas in the system comparing to other wet desulphuration technology. The resistance of the desulphuration tower is only around 850 PA. When the resistance comes up to around 1000 PA, the total resistance with the installation of steaming heating machine is only around 1250 PA. Therefore, desulphuration by ammonia can make use of the potential of the original boiler induced draft fan. In most occasions, there is no need to install booster fans. Even though the original fan has no potential, only simply modify it or add small pressure head can work. In this way, 50% power can be saved comparing the traditional dusulphuration process. The power consumption of the recycling pump can be saved near to 70%.

4. Leading corrosion prevention with liable operation
The process selected the national leading corrosion prevention technology, liable data and equipment, with the equipment liable rate up to 98.5%. The desulphuration chemicals and products are all solvent in the water. The desulphuration liquid inside the equipment is all clear without any scale pollution and abrasion, which will lead to the PLC, DCS control more easier.

5. Less space for equipment, for the benefit of old boiler modification.
It is unnecessary for pre-process in desulphuration by ammonia process. Moreover, the process for by-product is relative simple. The total equipment is around 30 sets with not much amount so that no need large-scale equipment. Some of the equipment was related to the boiler. A boiler with the capability of 75t/h-1000t/h needs 150m2 to 500 m2 space. The disposing of the desulphuration or ammonia is related to the sulfide content of the boiler, but not that closely related. The ordinary process usually needs space within 500 ㎡.

6. Denitration achieved during desulphuration process
Ammonia can absorb NOX so that Desulphuration by ammonia process can achieve denitration purpose at the same time. A Tianjin company has tested, 22.3% oxynitride has been get rid of.

7. Proprietary intellectual property rights assure the long-term development
Desulphuration by ammonia process is a proprietary intellectual property which will leads the lower cost development. Many other ways for desulphuration now are brought from other countries, which will lead to higher cost and resources over-clapped waste.
Desulphuraton by ammonia process is a liable technology with rich experience. If the waste ammonia liquid produced from the desuphuration process can be used as desulphuration chemicals, then this process shall be more satisfying with the recycling economy. The by-product, ammonium sulfite can be used as fertilizer after following up crystallization. Or, can be moved to ammonia fertilizer factory to be used as part of compound fertilizer to further decease the power consumption and lower the cost.