First.Background of the project

JAMIPOL, was set-up in 1995 as a joint venture promoted by Tata Steel and its associates (42%), SKW Stahl-Metallurgie, Germany (30%) and TAI Industries and associates (27%) for manufacturing of Desulphurising Compounds used in external desulphurization of hot metal (liquid iron).

Tata Steel Co., Ltd. Tata Steel has a glorious history in the steel industry for more than 100 years. It is the tenth largest steel company in the world. The current annual production of crude steel is 30 million tons (MTPA). Founded in 1907, the company was the first integrated steel company in Asia at the time and has now become one of the Fortune 500 companies.

Tata Steel's annual crude steel production capacity at the Jamshedpur (India) plant is 6.8 million tons and it is planned to increase production to 10 million tons by 2011. The company also plans to invest in three new steel plants in Jharkhand, Orissa and Chhattisgarh, with an annual steel production increase of 23 million tons. In addition, it is planning to invest in a new steel plant in Vietnam.

 

Coal combustion emits a large amount of SO2, NOx and CO2, causing atmospheric pollution, and acid rain is becoming more serious, which greatly jeopardizes our living environment. Therefore, it is particularly urgent and necessary to increase the control of SO2 in thermal power plants. At present, the main desulfurization process adopted by thermal power plants is flue gas desulfurization. According to the temperature of the desulfurization medium, it can be further divided into wet method, dry method and semi-dry method, and limestone powder is the most common desulfurizer.

When pulverized coal is burned, a certain proportion of limestone powder is mixed, and after a series of chemical reactions, the desulfurization effect can be achieved.

CaCO3 (limestone powder) high temperature CaO (lime) + CO2↑

CaO + SO2 high temperature CaSO3

2CaSO3 + O2 high temperature 2CaS04

Limestone-gypsum wet desulfurization process using limestone powder as desulfurizer, limestone powder needs to pass the solid-liquid two-phase dissolving reaction, and the reaction rate is proportional to the specific surface area of ​​limestone particles. The smaller the particle size of the limestone powder particles, the larger the mass specific surface area, the better the dissolving performance of the limestone particles, and the higher the various reaction rates. However, the smaller the particle size of limestone, the higher the energy consumption for crushing. The limestone powder normally required has a sieving rate of 95% through a 325 mesh sieve (44 μm). At the same time, the particle size of the limestone powder is related to the quality of the limestone. In order to ensure that the desulfurization efficiency and limestone utilization rate reach a certain level, when the content of impurities in the limestone is high, the limestone is ground to be finer.

india-tata-steel-power-plant-desulfurization-project.jpg

The lime powder is prepared by a traditional mill, which has high energy consumption, low output, complicated process flow, and difficulty in controlling fineness and particle gradation. After many years of painstaking research and development, the mill experts have successively launched patented products such as overpressure trapezoidal mill, European version of trapezoidal mill and vertical roller mill, which set off a new revolution in the field of limestone powder preparation.

The limestone mill has a simple process and high degree of automation; low energy consumption (20~30% lower than the power consumption of the traditional mill), high output and low wear; low noise, less dust, and clean operating environment; chemical composition of the product Stable, uniform particle size, adjustable product fineness, good limestone powder required for flue gas desulfurization, and improved desulfurization efficiency.

The equipment required for the whole process includes vibrating feeder, jaw crusher, mill, bucket elevator, belt conveyor, adjustment silo, control cabinet, etc. The main grinding equipment is the European version of the grinding machine produced by our company. Or vertical mill.

After the large-sized limestone is crushed to the required particle size by the jaw crusher, it is sent to the storage hopper by the bucket elevator, and then uniformly and continuously fed into the mill by the vibrating feeder, and the limestone powder after the grinding is pulverized. The wind blows up and is graded by a classifier. The fine-grained limestone powder enters the cyclone powder collector through the pipeline and is separated and collected. The collected limestone powder is sent to the stone silo by the conveyor for desulfurization. The unqualified particles are smashed to the wall of the cylinder after being separated by the separator, and are returned to the mill wall and then returned to the mill for grinding. The entire system is operated under negative pressure and the dust does not overflow to ensure cleanliness.

The method of desulfurization of coal-fired power plants can be divided into three categories: pre-combustion, combustion and post-combustion according to the sequence of the desulfurization process. Coal desulfurization before combustion mainly includes washing coal, chemical desulfurization and coal conversion; in combustion, it is called desulfurization in the furnace, mainly circulating fluidized bed and desulfurization in the furnace; desulfurization after combustion is also called flue gas desulfurization, according to The temperature of the desulfurization medium can be further divided into a wet method, a dry method and a semi-dry method. At present, the mainstream desulfurization method adopted by thermal power plants is flue gas desulfurization.

See the attached desulfurization process

Power plant flue gas desulfurization treatment is divided into two methods: dry method and wet method. At present, the most widely used desulfurization method in the world is wet desulfurization, which accounts for more than 80% of the total desulfurization. The commonly used wet desulfurization method can be divided into limestone-gypsum method, sodium alkali method, double alkali method, magnesium oxide method, ammonia method and the like according to the selected absorbent. In the wet desulfurization, the limestone-gypsum method is widely used in Shandong due to its wide source of raw materials and low cost, mature technology and high economical efficiency, and the most widely used. The magnesium-based desulfurization (magnesium oxide method) has high desulfurization efficiency and low input cost. Liaoning, Hebei and other places with rich mineral resources are favored.

Input material: 0-12 mm limestone CaO>81.6%, with less than 2% of free silicates,

Humidity: <0.1% H2O

Finished product output: 74 microns (200 mesh) D-90

Capacity of each unit: 30-35 TPH finished product

Type of mill: 3 sets MTW138 Pendulum type mill

two. Project difficulty

three. solution

Adopting a tower-style design, the total height is about 25 meters, and three parallel ways are adopted, with a total output of 30 tons. See the attached picture for the overall plan.

four. Live show

Fives. client feedback

We have purchased project equipment from Germany, the United States, India and other countries around the world. This cooperation with SBM has left a deep impression on us. Now China's equipment is indeed no worse than Europe and America.

From the quick response of the first inquiry to the after-sales service, the feeling of giving us the whole is indeed for us. Especially during the equipment installation period, engineers and employees of the Indian office are stationed at our site for follow-up. Nothing is too big, serious and responsible. After the commissioning of the project, the overall satisfaction was very good. Although there were many problems in the middle, the response speed and implementation of the service of SBM quickly helped us solve the problem.

As the owner, during the project engineering period, various problems are normal. However, we are most concerned about the feedback response and the attitude and speed of the problem. At this point, SBM is doing very well to us.

The output of 3 sets of equipment in the new factory is 30-35tph, which not only has large output, good environmental protection effect, but also consumes very little electricity. The most important thing is that the power plant is particularly satisfied with our desulfurizer; the fineness control is also very good, international standard The control system is also simple for our work. We are currently negotiating other grinding projects and hope to reach the next cooperation intention as soon as possible.

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