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About Nitrogen Oxides
Nitrogen oxides (NOx) have been recognized as one of the main pollutants in the atmosphere since the 1960 s. Nitrogen oxides (NOx), which are air pollutants, are often referred to as NO and NO2. Its impact on the environment is mainly manifested as aggravating the depletion of the ozone layer, promoting the greenhouse effect, forming photochemical smog and acid rain, and causing harm to plants. The harm of nitrogen oxides to the human body includes irritating the eyes, causing cancer, respiratory diseases, cardiovascular and cerebrovascular diseases and other diseases. In the national "Twelfth Five-Year Environmental Protection Plan", nitrogen oxides are included in the emission reduction targets, and the national nitrogen oxides need to be reduced by 10% compared to the end of the "Eleventh Five-Year Plan.
Nitrogen oxides (NOx) have been recognized as one of the main pollutants in the atmosphere since the 1960 s. Nitrogen oxides (NOx), which are air pollutants, are often referred to as NO and NO2. Its impact on the environment is mainly manifested as aggravating the depletion of the ozone layer, promoting the greenhouse effect, forming photochemical smog and acid rain, and causing harm to plants. The harm of nitrogen oxides to the human body includes irritating the eyes, causing cancer, respiratory diseases, cardiovascular and cerebrovascular diseases and other diseases. In the national "Twelfth Five-Year Environmental Protection Plan", nitrogen oxides are included in the emission reduction targets, and the national nitrogen oxides need to be reduced by 10% compared to the end of the "Eleventh Five-Year Plan.
Sanai commitment: from the design of environmental protection equipment, processing and production, transportation, on-site installation, system commissioning, trial operation, the implementation of turnkey projects, and to ensure that the environmental protection equipment on-site use to meet the national emission standards.
Three-resistant nitrogen oxide "zero emission" treatment scheme
1. Process flow
2 Main reaction mechanism
NO reductant → N 2 ↑ CO 2 ↑ H 2 O (catalytic condition)
NO 2 reductant → N 2 ↑ CO 2 ↑ H 2 O (catalytic condition)
Commander includes 2 → M2 3
> 2 > 3 > 2 > 2 > 2
HNO 2 reducing agent → N 2 ↑ CO 2 ↑ H 2 O
3 Scope of application
It is suitable for the treatment of nitrogen oxide waste gas with different components and contents of several hundred to tens of thousands of cubic meters of gas per hour. For the occasion of large gas volume, the device can also be used in parallel to solve.
Product Advantages
High absorption efficiency, treatment standard
Absorption efficiency up to 99.5% NOx emission concentration ≤ 240mg/m3
Zero pollution, zero emissions
No waste water and waste residue, no secondary pollution
Low investment and operating costs
The area is small, the reducing agent is economically available, and the treatment cost is generally the traditional alkali absorption method.
High integration, large operation flexibility
Using intelligent control system, touch screen operation. It can be operated and controlled separately, and the whole system is not required to stop for maintenance, so as to ensure the continuity of absorption treatment.
Corrosion resistance, long service life
The service life of the main equipment of the device can reach more than 8 years
engineering case
Great Wall Gold and Silver Refinery
Shandong Hengbang Smelting Co., Ltd.
Henan Zhongyuan Gold Smelter Co., Ltd.
1. Background introduction
Great Wall Gold and Silver Refinery is a professional enterprise in the production of national gold and silver refining, gold and silver alloy materials, gold and silver commemorative coin blanks and gold and silver handicrafts under the China Banknote Printing and Minting Corporation designated by the head office of the People's Bank of China. It is located in Chengdu, Sichuan Province. The Great Wall Gold and Silver Refinery has a production history of 50 years, and its annual gold and silver refining capacity can reach 100 tons and 300 tons.
2. The original flue gas absorption device
Three-stage spray washing tower lye treatment
3. Problems Existence
The treatment is not up to standard, and yellow smoke is often emitted, sometimes light and sometimes thick. After testing, the content of discharged NOx is greater than 300 mg/m3, the discharged waste liquid needs to be treated separately, the operation cost is high, and the environmental protection pressure is high.
4. Solution
Using our nitrogen oxide waste gas treatment environmental protection equipment
Specification model three resistance SN--350 (silver dissolving process)
Three-resistance SN--180 (gold dissolving process)
a. Technical parameters
Five-stage Venturi absorber (including equipment body, circulating pipeline, wire and cable, etc.),
Exhaust gas fan is made of glass fiber reinforced plastic, with an air volume of 4500m3 /h
The maximum size of the site is 13*4*6m
Nitrogen oxide discharge concentration ≤ 240mg/m3, zero discharge of wastewater
The exhaust gas after absorption meets the GB16297-1996 standards of "Emission Standard of Pollutants for Copper, Nickel and Cobalt Industry", GB25467-2010 of Emission Standard of Odor Pollutants "and GB14554-19939 of" Comprehensive Emission Standard of Air Pollutants.
B. Installation and commissioning time and operation effect
Installation time 7 days Commissioning time 2 days
The yellow smoke disappeared on the operation effect of the day
The operation evaluation is stable and reliable, high efficiency and no efflux products
Now the stable operation time is 4 years and 10 months (gold dissolving process),8 years and 2 months (silver dissolving process)
During the period of failure, replace the motor, 6 valves, 1 bolt, 30 bolts (silver dissolution process)
Replace 1 set of motor and 2 sets of valves (gold dissolving process)
1. Background introduction
Shandong Hengbang Smelting Co., Ltd. (stock abbreviation: Hengbang Stock, stock code: 002237) was established on February 18, 1994. The company is mainly engaged in gold exploration, mining, selection, smelting and chemical production. It is a national key gold smelting enterprise with an annual production capacity of 20 tons of gold, 300 tons of silver, 50,000 tons of electrolytic copper, 700000 tons of sulfuric acid and 15,000 tons of liquid sulfur dioxide, the annual output of gold ranks among the forefront of gold enterprises in the country. The company's refining branch for the raw lye spray method to deal with substandard environmental protection equipment for renewal.
2. The original flue gas absorption device
Treatment of two-stage spray washing tower with alkali liquid
3. Problems Existence
The treated flue gas cannot meet the standard, and yellow smoke is often emitted, sometimes light and sometimes thick.
4. Solution
Using our nitrogen oxide waste gas treatment environmental protection equipment
Specification model three-resistant SN--300
a. Technical parameters are as follows:
Nitrogen oxide treatment capacity: 250-300m3 /h,
Five-stage Venturi absorber (including equipment body, circulating pipeline, valve and pump)
Exhaust gas fan is made of glass fiber reinforced plastic, with an air volume of 6300m3 /h
Nitrogen oxide emission concentration ≤ 240mg/m3 ,HCL emission concentration ≤ 100 mg/m3, zero discharge of wastewater.
NOx emission rate: ≤ 0.77 kg/h.
The consumption of excipients and the weight of nitrogen oxides are controlled within 0.7:1.
The treatment efficiency of the device is> 99%.
B. Installation and commissioning time and operation effect
Installation time: 7 days Commissioning time: 2 days
The yellow smoke disappeared on the operation effect of the day
The operation evaluation is stable and reliable, and the current stable operation time is 1 year and 10 months.
Replace one motor during the failure.
1. Background introduction
Henan Zhongyuan Gold Smelter Co., Ltd. (a secondary subsidiary of China National Gold Corporation) is currently a well-known professional gold smelting and refining enterprise in China. It is the backbone enterprise of China National Gold Group and a key enterprise determined by the Sanmenxia Municipal Government. The company's overall relocation and upgrading project, designed by China Enfei Engineering Company, deals with complex gold concentrates as raw materials, copper concentrates as auxiliary materials (as gold collectors), and a small amount of dearsenized gold concentrates. The first phase of complex gold concentrate treatment 1.5 million t/a, the second phase of the general plan reserved location. The products are gold ingot, silver ingot, cathode copper, nickel sulfate, refined selenium, refined tellurium and sulfuric acid.
Using our nitrogen oxide waste gas treatment environmental protection equipment
Specification model three resistance SN--350 (silver dissolving process)
A. technical parameters are as follows
Nitrogen oxide treatment capacity: 350m3 kg/h, mass 50 kg/h.
Five-stage Venturi absorber (including equipment body, circulating pipeline, chimney, etc.),
The exhaust fan is made of glass fiber reinforced plastic, with an air volume of 4600m3 /h and a residual pressure of 800Pa.
Purification efficiency ≥ 99%,
Exhaust emission ≤ 240mg/m3, zero discharge of waste water.
Equipment size (for reference only): length x width x height = 12.8X3.8X6 (m).
The NOx absorption system is controlled by PLC, which can realize the conversion between "local control" and "remote centralized control.
The exhaust gas after absorption meets the GB16297-1996 standards of the "Copper, Nickel, Cobalt Industrial Pollutant Emission Standard", the GB25467-2010 of the "Odor Pollutant Emission Standard", and the "Comprehensive Air Pollutant Emission Standard"; the absorption product has zero emission without any treatment, and truly realizes Efficient and environmentally friendly operation.
B. Installation and commissioning time and operation effect
Installation time: 12 days Commissioning time: 2 days
Operation effect: the discharged nitrogen oxide is less than 150mg/m3 (silver process)
Customer Application
Central Plains Gold
Great Wall Gold and Silver
Yunnan Dianjin
Shandong Gold
Jinchuan Group
Hunan Gold
Hengbang shares
Zhaojin Mining Industry
Contact Us
Telephone:0571-64736929
E-mail:ir@3nff.com
Address: 929 Xin 'anjiang Road, Jiande City, Zhejiang Province
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