Compact De-NOx SCR System with In-house De-NOx Catalyst

Basic Information

Nippon Shokubai’s De-NOx system utilizes Selective Catalytic Reduction (SCR) technology to remove nitrogen oxides (NOx) from flue gas emitted by power plant boilers, gas turbines, and various other combustion sources. A reducing agent, such as ammonia or urea, is injected into the exhaust steam upstream of a honeycomb-structured catalytic reactor, where NOx is converted into harmless nitrogen (N₂) and water (H₂O).

Nippon Shokubai’s advanced De-NOx system delivers exceptional, long-lasting NOx removal performance with minimal ammonia slip and low pressure drop.

De-NOx System Diagram

Features and Properties

• Nippon Shokubai began its De-NOx system business in 1987. Since then, we have built an extensive track record of deliveries for a wide range of applications, including industrial and waste incinerators, boilers, and various types of power generators.
• Our engineering team designs and manufactures tailor-made De-NOx systems using proprietary catalysts uniquely developed by Nippon Shokubai to meet the specific needs of each customer.
• Our compact De-NOx systems are engineered to fit within each customer’s available installation space, effectively handling high concentration of NOx and challenging exhaust gas conditions that require high NOx removal efficiency.

System Overview

• A precise amount of reducing agent, equivalent to the quantity of NOx to be removed, is sprayed into the exhaust gas through a specially designed injection nozzle. The injection volume is automatically adjusted according to load fluctuations.
• The exhaust gas, with the reducing agent evenly dispersed, then passes through a catalyst layer in the reactor, where the NOx is decomposed into harmless nitrogen and water.

System Flow Diagram -1

System Flow Diagram -2

Examples of Applications

Examples of Use

		Industrial incinerators	Waste incinerators	Power generators
				Gas turbines	Diesel engines	Gas engines
Exhaust Gas Composition	Gas Volume (Nm3/h)	2,000 – 55,000	10,000 – 75,000	15,000 – 80,000	3,000 – 45,000	10,000 – 40,000
	NOx (ppm)	10 – 2,500	100 – 500	30 – 150	800 – 1,500	50 – 250
	O2 (%)	5 – 21	5 – 12	12 – 18	10 – 13	10 – 15
	SOx (ppm)	0 – 30	1 – 30	0 – 1	0 – 200	0 – 5
	H2O (%)	1 – 25	15 – 35	4 – 7	4 – 7	8 – 12
Catalyst Performance	Processing Temperature (°C)	175 – 300	175 – 220	200 – 380	330 – 400	350 – 400
	SV (h-1)	1,000 – 8,000	1,500 – 4,000	8,000 – 20,000	5,000 – 15,000	5,000 – 15,000
	NOx Removal Efficiency (%)	60 – 98	50 – 95	70 – 90	20 – 92	80 – 95