The year 2021 will be the opening year of the 14th Five-Year Plan and the 100th anniversary of the founding of the Party. 2021 will see macro policies maintaining continuity, stability and sustainability. Continue to implement proactive fiscal policy and prudent monetary policy, maintain the necessary support for economic recovery, accelerate the construction of a new development pattern with the main domestic cycle and the domestic and international cycles promoting each other, grasp the main line of supply-side structural reform, and focus on demand-side management, promote economic operation in a reasonable range, and continue to do a good job of "six stable We will continue to do a good job of "six stability" and "six protection" work.

China's steel industry accounts for about 15% of the country's total carbon emissions, making it the manufacturing industry with the highest carbon emissions. The world produces and uses up to 1.8 billion tons of steel each year, nearly 50% of which is produced in mainland China, and carbon emissions from China's steel industry also account for about 50% of the total carbon emissions from the global steel industry. According to McKinsey's calculations, if we want to achieve the scenario of global average temperature rise of no more than 1.5℃ by the end of this century, China's steel industry must reduce emissions by nearly 100% by 2050, which is a very challenging target.

Since the "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Steel Industry" was released at the end of April 2019, ultra-low emissions upgrading in the steel industry is progressing steadily and comprehensively. At present, the steel industry has developed into an industry chain cluster with major NOx emission sources including sintering, pellets, coking, white ash, iron making, steel making, steel rolling and gas boilers, among which sintering, pellets, coking and white ash kilns are the major NOx emission sources of the steel industry.

According to the Ministry of Ecology and Environment's "Notice" requirements, guided by the "Implementation Guide for Ultra-Low Emission Transformation of Iron and Steel Enterprises" issued by the China Environmental Protection Industry Association, the ultra-low emission transformation of key regions will be accelerated, and the number of enterprises that have completed ultra-low emission assessment and monitoring and publicized will increase by a certain margin based on 2020. It is expected that in 2021, the requirements for differentiated management of heavy pollution weather classification performance will be expanded to cover the non-key regions with persistently poor air quality ultra-low emission transformation process and differential water and electricity pricing policies will also be introduced one after another, forcing enterprises to implement the transformation. The number and scale of ultra-low emission transformation enterprises continue to increase nationwide. How to further contribute to carbon emission reduction and energy saving in the original environmental technology process route is the question we have to think deeply.

Sintering machine desulfurization and denitrification dust removal device of Shanxi Hongda Special Steel Co., Ltd.

The following is a technical summary of the flue gas characteristics and mature environmental processes for sintering pellets, coking and white ash kilns.

A, steel sintering, pellet machine mature ultra-low emission environmental protection process
Sintering machine flue gas characteristics are as follows.
Low temperature of the original flue gas denitration, generally at 120 to 150°C.
High flue gas SO2 concentration, the flue gas SO2 concentration is generally 1000 to 1500mg/m3, special up to 3000 to 5000mg/m3.
High moisture content of flue gas, which can reach 13% to 18% (vol%).
Complex dust composition, containing K2O, Na2O, ZnO and other alkali/alkaline earth metal components, and high dust viscosity under high humidity and high sulfur working conditions, easily causing catalyst blockage.

The current mature ultra-low emission environmental protection processes are as follows.
Wet desulfurization + wet type electric dedusting + medium and low temperature SCR flue gas denitrification
SDA, CFB semi-dry desulfurization + bag dedusting + medium and low temperature SCR flue gas denitrification
SDS dry desulfurization + bag dedusting + medium and low temperature SCR flue gas denitrification
Activated carbon dry desulfurization and denitrification integrated process
Electrostatic precipitator (ash distribution process, high efficiency tube type precipitator) + medium and high temperature SCR denitrification + wet desulfurization + wet type electric precipitator

Second, the steel coking mature ultra-low emission environmental protection process
The flue gas characteristics of coking projects are as follows.
Lower coke oven flue gas temperature, higher than that of sintered pellets, generally around 180 - 260°C.
High flue gas water content, generally in the range of 12% to 18% (vol%).
Fuel differences, resulting in large differences in NO content in coke oven flue gas, generally in the range of 300-1500 mg/Nm3.
Large differences in SO2 content in different coking plants. SO2 in coke oven flue gas: the content is generally in the range of 50-800mg/Nm3.
The dust content is low, generally in the range of 20-50mg/Nm3.

The current mature ultra-low emission environmental protection processes for coking are as follows.
Wet desulfurization + wet type electric dedusting + low temperature SCR flue gas denitrification
SDA, CFB semi-dry desulfurization + bag dedusting + low-temperature SCR flue gas denitrification
SDS dry desulfurization + bag filter + low temperature SCR flue gas denitrification

Three, the steel white ash kiln mature ultra-low emission environmental protection process
The flue gas characteristics of lime kiln project are as follows.
Low flue gas temperature of white ash kiln, generally around 140-220℃.
Low flue gas water content, generally in the range of 5% to 8% (vol%).
Low SO2 content, generally in the range of <50mg/Nm3, but with fluctuations.
Very high dust calcium content, generally around 60-80%.

The current mature ultra-low emission environmental protection process for lime kilns is as follows.
Bag filter + low temperature SCR flue gas denitrification

Based on the above environmental protection engineering route, if from 130-150℃ flue gas temperature state through GGH to 280℃ denitrification operation, 1Nm3 (per standard cubic meter) of raw flue gas of blast furnace gas energy consumption is about 80KJ/Nm3, while at 200℃ denitrification operation 1Nm3 (per standard cubic meter) of raw flue gas of blast furnace gas energy consumption is about 50KJ/Nm3, denitrification system at 200℃ operation, it saves 37.5% of gas energy consumption than operating at 280℃. According to the annual operating time of 7920h and the calorific value of blast furnace gas is 4000KJ/Nm3, the low temperature SCR denitrification system can save the owner about 44.55 million Nm3 of blast furnace gas per year, which is calculated according to the unit price of blast furnace gas of 0.1 Yuan/m3, and the annual operating cost of this item alone can save 4.455 million Yuan, which fully shows the great energy saving advantage of low temperature denitrification. The huge energy saving advantage of low temperature denitrification.

Yuanchen Technology (stock code: 688659) designs and develops ultra-low temperature SCR denitrification catalysts with stable and reliable denitrification performance at medium and low temperatures of 140~180℃ by improving the combination of carrier and other components, rare earth doping and changing the doping process, regulating the chemical environment and pore structure of the carrier surface, building the directional distribution of microscopic acid and alkali centers, enhancing the catalytic efficiency and alkali tolerance of the catalysts at medium and low temperatures, and making the catalysts meet the requirements of fluctuating operating conditions. We designed and developed the ultra-low temperature SCR denitrification catalyst with stable and reliable denitrification performance under the denitrification flue gas temperature of 140~180℃. If our ultra-low temperature catalyst technology is adopted, the energy saving and low carbon benefits will be more obvious. 

Since 2015, Yuanchen Technology has been deeply engaged in the SCR medium and low temperature non-electricity field, and has provided high-quality products and whole life cycle management services for well-known enterprises in the power industry, steel industry, building materials industry, solid waste industry and other industries, and has helped denitrification in coking, sintering, pellet, lime kiln, steel rolling and other enterprises, with more than 100 service projects. 2018, the sintering machine project of Hershey Steel adopted for the first time 220℃ medium and low temperature denitrification products, in coking, lime kiln and steel rolling all achieve 180℃ denitrification, to meet the NOx export 50mg/Nm3, because it can meet the customer's needs of low or high temperature, can meet a variety of process routes, help to achieve low energy consumption, low carbon operation,, and won the majority of praise and commendation from the industry.

Yuanchen Technology Technology Lime Kiln first set of performance Certificate

In the opening year of the 14th Five-Year Plan, Yuanchen Technology will continue to uphold the mission of "contributing to the world's environmental friendliness and human health", and will continue to develop new products without forgetting the original intention.