A cement company in Beijing was penalized by 200,000 yuan for the automatic monitoring of equipment data pollution. Beijing Municipal Environmental Protection Bureau issued an administrative penalty hearing notice today.
Tungsten carbide roller has characteristics of good wear resistance, high temperature red hardness, thermal fatigue resistance and thermal conductivity and high strength , have been widely used in high-speed wire rod, bar, rebar, seamless steel tubes, etc. Domestic production of tungsten carbide roller materials mostly WC- Co, WC- Co- Ni- Cr two series, and the content of Co, Co- Ni - Cr is in the range of 6wt% ~ 30wt%. From the use of perspective, tungsten carbide rollers has good mechanical properties, its flexural strength up to 2200 MPa or more, shock toughness up (4 ~ 6) × 10^6 J/ m^2, Rockwell hardness (HRA) is up to 78 to 90, widely in the high-speed wire rod rolling process, which is much higher than single-slot chilled cast steel or high speed steel rolls.Tungsten carbide is made of Tungsten Carbide Powder and binder phase (such as drilling, nickel, etc.), and then pressing and sintering, regardless of the conditions under cold rolled or hot rolled has excellent wear resistance, tungsten carbide rollers has been widely used in pre-finishing mill and finishing of high-speed wire rod currently. On the performance of tungsten carbide roller in hot-rolling wire rod , the material must meet the following requirements:
Tungsten carbide roller material design
Tungsten carbide roller category
Tungsten carbide roller production process control Carbide Roller,Carbide Ring,Mill of Rolling Line,Steel Wire Rod,Mill Rolling Finish Stand,Mill Roller Groove Type Luoyang Golden Egret Geotools Co., Ltd , https://www.lyshieldcutters.com
According to reports, in order to improve the effective supervision of key pollution sources in real time, Beijing has established an automatic pollution source supervision system and realized real-time monitoring of more than 200 key pollution sources in the city. With this scientific and technological means, the environmental protection department can grasp the status of pollutants emitted by the pollution source units for the first time, and discover that violations such as exceeding the standards and stopping the treatment of facilities can be dealt with in a timely manner according to law. The key pollution source units can also adjust their own production and pollutant discharge management at any time according to the automatic monitoring data, and achieve emission standards.
In June of this year, Beijing Environmental Monitoring Corps found that the automatic monitoring data of Beijing Lima Cement Co., Ltd. was lower than the normal emissions data of the industry during the daily inspection of automatic monitoring data. On June 24, the law enforcement officers of the Environmental Monitoring Corps conducted a comprehensive system inspection of the company and found that its automatic monitoring of IPC parameters was artificially modified. As a result, the measured concentrations of nitrogen oxides, sulfur dioxide, and particulates were only 70% of the actual emission concentration. % and 50%, resulting in significantly lower emission concentrations of the three major pollutants. It is understood that the company has modified the parameters so that the environmental protection department obtains much less emission data than the actual emission value, so that the purpose of paying less sewage charges can be achieved.
The behavior of the company has violated relevant laws and regulations related to environmental protection. The Beijing Environmental Monitoring Corps immediately ordered the company to stop the illegal activities and required it to make correction within a time limit. On July 29, the Environmental Monitoring Corps issued an administrative penalty notice to the company and penalized him for a fine of 200,000 yuan. In addition, it will also be required to pay sewage charges in accordance with the law.
Beijing Environmental Protection Bureau stated that from the perspective of online monitoring of pollution source automatic supervision system, most units can abide by the law and self-discipline, but there is no lack of such companies as Lima Cement Co., Ltd., in order to pursue economic interests, lack of corporate social responsibility, and relax their management. Requests to find ways to get rid of supervision in order to exchange environmental pollution for the company's economic interests. The environmental protection department in Beijing will further increase daily inspections of automatic monitoring data and find that relevant environmental violations will be punished with high penalties according to law.
1. Sufficient anti-fracture strength;
2. Good abrasion resistance;
3. The smooth surface finish;
4. Excellent corrosion resistance, thermal fatigue, thermal cracking performance.
Tungsten carbide roller rings can working in bad conditions , small profile rolling (especially rebar rolling) process conditions is harsher than the high-speed wire rod, and therefore corresponds to the profile rolling ,tungsten carbide rollers recommend using high binder phase carbide.
Pre-finishing all vehicles roller should ensure its high toughness, strength, rigidity and thermal conductivity, followed before considering its wear resistance. When designing each vehicles roller, pre-finishing materials should choose carbide grades of Co, Co- Ni- Cr binder content is high (greater than or equal to 25wt%) , requiring an average WC grain size of coarse (5μm ~ 6μm), to obtain a higher shock toughness, proper strength and hardness. For the finishing of the roller movements, particularly the last two rollers of the finish rolling, which suffered load is small, and high relative velocity of the material to be pressed (80 m / min ~ 120 m / min). In this case, the wear resistance of the roller to be the most important requirements, and must ensure the strength , timpact toughness and hardness of a reasonable match, so the binder of Co / Ni content ratio and the average grain WC control of particle size and other factors must have greater control in front of different pre-finishing rolling roll.
According to the structure of tungsten carbide rollers, it can be divided into solid tungsten carbide roller and composite tungsten carbide roller. Solid tungsten carbide rollers have been widely used in pre-finishing and finishing stands high speed wire rod mill (including fixed reducing the rack, pinch roller rack). Composite tungsten carbide roller is made of cemented carbide and other materials, and it can be divided into tungsten carbide composite roll rings and solid tungsten carbide Composite Roller. Tungsten carbide composite roll rings mounted on the roller shaft; solid tungsten carbide composite roller will be directly cast in the roll axis to form a whole, a large load is applied to the rolling mill.
Tungsten carbide rollers produced by powder metallurgy method, the key to its process control is the chemical composition of the material and the mixture was prepared, pressed molding, sintering and deep processing and other preparation process parameters.
1. Preparation of starting material (WC focus quality): As the WC raw material and quality control of the use of different levels of quality may fluctuate, resulting in adverse effects on microstructure.
2. Preparation of the mixture: Mixture preparation is the key to the production process of the roller, the roller of failure modes - trachoma, mainly generated by this procedure.
3. Pressing: roller pressing is an important process of the roller mill.
4. Sintering: roller sintering is to determine the final quality of the roller production processes, use of advanced low-pressure sintering technology, HIP sintering technology can greatly improve the performance of roller.
5. Deep processing: deep processing rollers have a greater impact on the quality and accuracy of the roller surface.
Environmental monitoring data fraud is fined 200,000