Nitrogen oxide emissions in the cement industry accounts for about 10% of the total, second only to electricity and motor vehicle exhaust emissions. With the power to promote denitrification standards, the cement industry to improve emission standards become a trend. Ministry of Environmental Protection announced the "cement industry emission standards" for existing and new uniform implementation capacity of 400 mg / cubic meter of nitrogen oxide emissions standards, and the implementation of the draft provisions of existing enterprises 450 mg / cubic meter, new enterprises by the end of 2013 implementation of 320 mg / m standard (already older standard 800 mg / m increased dramatically). Taking into account the greater proportion of the stock of capacity, we believe that the draft more stringent standard than formal, reflecting the policy of unprecedented attention on environmental issues. The new standard in most European countries than the standard limit strictly, close to Japan and Germany, higher emission standards.
The main denitration technology is divided into: the first is the front-end control, including: 1, changing the ingredients programs, optimizing processes, etc.; 2, low NOx burners; 3, staged combustion. The second category is from the rear of governance, including: 1, selective non-catalytic reduction (SNCR); 2, selective catalytic reduction (SCR). The third category is a combination of various technologies denitrification, are: 1, staged combustion + SNCR; 2, SNCR / SCR combined denitrification. From the perspective of the effectiveness of various technologies, the installation of SNCR is the inevitable choice to meet the new standards. Ammonia as a reducing agent is a major cost SNCR denitration. Taking into account the excess capacity of ammonia, cement demand denitration new progressive release of ammonia, ammonia prices we believe the lack of upward momentum, cement denitration cost control.
According to our estimates, and communication within the industry point of view, 2000t / d clinker production line and below the NSP is not due to the presence of economy, may not be installed denitration equipment, production capacity exists in this section may be eliminated in the future. Currently the country 2000t / d production line and below the total annual clinker production capacity of 147 million tons, accounting for all NSP clinker production capacity of about 9% to about 8% of total capacity. 2000t / d and less dry process clinker production lines and kiln, etc. (together accounted for about 22% of total capacity) if we can phase out over the next 3-4 years, while at the same time new capacity has been effectively controlled, the cement industry supply surplus is expected to be effective in improving the situation.