NUMAC Hingna, NAGPUR, Maharashtra

This invention by NuMAC, is related to rotary vane assembly and body liners for XRP type coal mills used in power station to pulverize coal. In XRP coal mill, rotary vane assembly is mounted on fabrication or in a casting. The main objective behind this invention was to provide a body liner rotary vane assembly, which is able to prevent frequent damages of the assembly.   This product is also patented by NuMAC and successfully commercialized in all Thermal Power Plants in Maharashtra.   Following are some of the advantages of rotary vane assembly and body liners for XRP type coal mills:               1. To prevent frequent damages of the assembly.               2. Easy to commission, replace and maintain.               3. It outages and thereby the downtime of mill saves huge amount of power.               4. The vanes are so locked so as to minimize welded joints and worn out vane will never fail due to two sides                    locking of pins.               5. To overcome the problems and shortcomings with prior art techniques and approaches.               6. The body liners in the rotary vane assembly are mainly to support and guide air pressure by inducing a PA fan                    effect inside the coal mill and produce perfect vortex.               7. Due to the specified angle in the body liners, the air pressure is equally distributed.   Apart from these above products, NuMAC has been successfully doing other jobs at various sections like Boiler Maintenance, Turbine Maintenance, Coal Handling Plants at various Power Plants. They are given in a short manner for reference.

The Mobile Coal Sampling Equipment (MCSE) is the latest innovation from NuMAC. NuMAChas been working with the schematics and small models since 1996 and finally got the opportunity to develop the existing model in March 2008.   MCSE is specially designed and manufactured for the purpose of collecting the coal samples for testing the coal quality using a mechanized Auger. In MCSE, dimension of the mechanized Auger have been designed by the IS-436 (Part-I/Section-I) standards. The equipment is mounted on a hydraulically operated Retractable arm. It can be raised above the rail wagon and then lowered to collect the coal sample. The rotary motion of the Auger enables it to go down in the coal up to the desired depth and pick up the sample. The MCSE’s motor is reversed and the sample is collected in the desired bin. This complete assembly is mounted on a mobile unit that can easily go to the rail-wagon to be sampled.   NuMAC started R&D for this equipment in 1994 and finally after several smaller and complicated models, this present model was developed in 2008. NuMAC is the patent holder of this product and is also a sole manufacturer. We wish to bring this to your notice that any other company claiming so is misguiding.   Our equipment is working successfully at all thermal power plants of MAHAGENCO, in Maharashtra. Our equipment is Koradi, Khaperkheda, Chandrapur, Parli, Paras, Bhusawal and Nashik Thermal Power Plants.   This Equipment has a 300 Dia,1.8 Meter length mechanized Auger mounted on a Hydraulically-Operated Retractangle Arm   The Auger is raised above the wagon /truck and then lowered with a hydraulically operated motor,the hydraulic motor is stopped and it is pulled up above the coal hydraulic motor is reversed and the sample is collected in the desired Bin.   This Equipment has a hydraulically-operator-cabin that enables the Operator to see the Auger at all times.This is complete assembly is mounted on a mobile unit that can easily go to the Rail-wagon to be sampled.   Advantages of Mobile Coal Sampling Equipment.   The main advantage of Mobile Hydro-Mechanical Coal Sampling Equipment is that, it helps power corporations to reduce the disputes with the coal suppliers by identifying the true sample of coal. The Mobile Hydro-Mechanical Coal Sampling Equipment works faster than manual collection. There is no room for any kind of human error or human bias. The sample collected by the Mobile Hydro-Mechanical Coal Sampling Equipment, is truly representative of the coal provided.   Necessity of Coal Sampling.   Quality of coal plays an important role in all its utilization activities. Depending on the ultimate objective, be it steel making or power generation, the feed coal must satisfy some desired quality parameters. Coal is a highly heterogeneous substance in terms of inorganic and organic constituents. It exhibits wide variability with respect to size and chemical compositions of the particles. Growing quality consciousness on the part of both suppliers and customers has made quality monitoring an integral part of the industrial activity. Proper quality monitoring of coal involves implementation of standardized procedures for sampling, sample preparation and analysis to provide a reliable estimate of the desired quality parameters at minimum variance.   The basic purpose of collecting and preparing a sample of coal is to provide a test sample which when analyzed will provide the test results representative of the lot sampled. Detailed documented procedures are laid down in National and International Standards for executing the job of representative sampling pertaining to different methods of sampling. However, due to time, technical and other economic constraints strict implementation of the procedures is difficult to practice for routine monitoring job. Modified methodologies are implemented after mutual consent of the seller and the purchaser. It is a known fact that about 80% of the total variances involved at the different stages of sample collection, preparation and analysis come from errors during its collection only. The important issue that is not always considered is the effect of modified procedures on the precision of the final result. This often leads to different controversies between the seller and the customer.