Lignite Coal

Lignite Coal Lignite coal is a natural resource which is readily available. It is often referred to as brown coal. It has some special characteristics which make it different from other coals. Lignite coal is a soft, brown, combustible, sedimentary rock formed from naturally compressed peat. It is considered to be the lowest rank of coal due to its relatively low heat content. It has lowest carbon (C) content amongst all types of coals. It is mined all around the world and is mainly used as a fuel for steam and electric power generation. Since it is not economical to transport lignite coal, it is not traded extensively on the world market when compared with higher grades of coal. Large reserves of lignite coal are available in limited areas of the world. Australia, USA and China have the major reserves of lignite coal. Germany has the largest number of power plants based on the lignite coal. In USA, most of the reserves are located in the North Dakota province while in India, the lignite coal reserves are in Neyveli in Tamil Nadu and in Rajasthan. Around 17 % of the world’s coal reserves are lignite coal. As the world’s oil and gas reserves decline, other sources have become attractive. That is why there is a sustained interest in the use of lignite coal. Coals are classified by rank according to their progressive alteration in the natural metamorphosis from lignite to sub bituminous coal to bituminous coal and to anthracite. Coal rank depends on the volatile matter, fixed carbon, inherent moisture, and oxygen, although no one parameter defines rank. Typically coal rank increases as the amount of fixed carbon increases and the amount of volatile matter decreases. Coal is a complex combination of organic matter and inorganic ash formed over eons from successive layers of fallen vegetation....

Organizational Productivity by Harnessing the Strength...

Organizational Productivity by Harnessing the Strength  Effective organizational management achieves the productivity by harnessing the strengths available in the organization (Fig 1). It is aware that it cannot build on weaknesses. To achieve results, it has to use all types of the available strengths in the organization which include the strengths of the non-executives, the strengths of the executives, and its own strengths. These strengths are the true opportunities. After all, the unique purpose of the organization is to make strength productive. It cannot, of course, overcome the weaknesses with which the organizational employees are generally having with them, but it can always make these weaknesses irrelevant. It is to strive for using the strength of each employee as a building block for the enhancement of the organizational productivity. Fig 1 Organizational productivity by harnessing the strength The major area in which the effective management encounters the challenge of strength is in its function of staffing. The effective management fills positions and promotes people on the basis of what the employee can do. It does not make staffing decisions to minimize the weaknesses of the organization but to maximize the strengths. Such management makes effective appointments since it selects people for their tested abilities and not for the absence of a weakness. It staffs people for their strengths though they may have weaknesses which are to be ignored. The people having narrow but very great strength normally bring success to the organization. If the management tries to place a person or staff the organization to avoid weakness then it ends up at best with mediocrity. The idea that there are ‘well-rounded’ people, people who have only strengths and no weaknesses (whether the term used is the ‘complete man’, ‘mature personality’, ‘well-adjusted personality’, or ‘generalist’)...

Matmor Process for Iron making Aug27

Matmor Process for Iron making...

Matmor Process for Iron making Matmor process is an iron making process which is presently being developed by Environmental Clean Technologies Ltd (ECT). Matmor process technology is a patented technology. The technology is based on lignite coal and is capable of replacing high-grade lump iron ore with lower-cost alternative raw materials because of its unique chemistry and furnace design. Normally lignite coal (also known as brown coal) is not used for metallurgical applications because of its high volatile matter and moisture content. Environmental Clean Technologies Ltd is the owner of the Matmor process technology, including plant, equipment and intellectual property (IP). The Matmor process has placed itself to revolutionize primary iron making process with a design consisting of a simple, low cost, low emission, and patented Matmor retort using cheaper, alternative raw materials. This technology comprises two exclusive features namely (i) it uses lignite coal as a reductant and heat source which is not claimed as of now by any other technology, and (ii) it includes in its plant design, a vertical shaft furnace which works with the natural chemistry of the lignite coal. The development of the Matmor process is based upon the removal of moisture by Coldry technology another patented technology of the Environmental Clean Technologies Ltd and the harnessing of the natural chemistry pf the lignite coal through a process and a vertical retort furnace whose design and process chemistry is different to those of a blast furnace. The process chemistry of the Matmor process utilizes hydrogen as a reducing gas, enabling lower operating temperatures and shorter process times than countered in the iron making by blast furnace. Though the Matmor process technology is individually attractive, its combination with the Coldry technology has higher attractiveness since both the technologies when together are...

Reagents for Desulphurization of Hot Metal...

Reagents for Desulphurization of Hot Metal Sulphur (S), present in solid steel as iron sulphide (FeS) inclusions, has several detrimental effects on steel processing and on steel’s physical properties. During deformation, the iron sulphide inclusions act as crack initiation sites and zones of weakness. Such inclusions from sulphur adversely affect steel’s toughness, ductility, formability, weldability, and corrosion resistance. An increase in manganese (Mn) however, helps prevent formation of iron sulphide, which is highly detrimental to steel’s hot workability and also leads to severe cracking. Sulphur is such an undesirable element in steel that its removal is desired. The ever increasing requirements to steel properties and the growing demand for steel qualities and quantities with lowest sulphur contents of down to 0.001 %, has made it necessary for the steel makers to carry out the desulphurization of hot metal. Presently hot metal is regularly being desulphurized to below 100 ppm, and in some steel plants, to 10 ppm. Besides the increased requirements of steel quality, other reasons which necessitate desulphurization of hot metal are reduced scrap quality and increasing cost of high quality iron ores. In the desulphurization process, powdered desulphurization reagents are injected into the hot metal through an immersed lance using an inert carrier gas such as argon or nitrogen, as shown in Fig 1. Since desulphurization is a diffusion-controlled reaction, and related to the reactive surface area available for reaction, the desulphurization reagents are to be as fine grained as possible. However, flowability is reduced with very fine grains and hence it is necessary to find an optimum between efficiency and conveying ability. In order to obtain good flow characteristics, normally a fluxing agent is added during the grinding operation, so that pneumatic transport during injection does not pose any problems. Fig...

Elements of Decision making...

Elements of Decision making One of the important tasks of an executive is the decision making. It generally takes a small fraction of his time. Nevertheless the decision making is a very important aspect of his work since the decisions he makes by virtue of his position, knowledge or experience have significant impact on the entire organization, its performance, and the results. Hence, executives to be effective are to make wise decisions. They are to make the decisions as a systematic process with clearly defined elements and in a distinct sequence of steps. For an effective decision making, the executive is to normally concentrate on those important and strategic decisions which have big impact for the organization. These strategic decisions need to have the highest level of conceptual understanding. The executive is required to find the constants in a situation and is to apply his skill to manipulate a great many variables arising out of the chaotic thinking in order to make an effective decision. He is to know what the decision is all about and what the underlying realities are which the decision is required to satisfy. The executive is to look out for impact rather than the technique. He is to ensure that the decision he makes needs to be sound rather than clever. An executive while making a decision is required to know whether the decision is to be based on principle or it is to be made on the merits of the case and logically. He is to be aware that the trickiest decision is the one which is between the right and the wrong compromise he has to make and he is to be able to judge one from the other. Further, the executive is to be aware that...