clinker crusher hammer in kenya

strong and reliable hammer impact crusher i flsmidth

strong and reliable hammer impact crusher i flsmidth

Many cement plants extract limestone by blasting, which often leads to oversized boulders containing a lot of clay and sand. The crusher therefore has to handle feed that contains larger blocks as well as some sticky materials. Our EV Hammer Impact Crusher is a proven, reliable and cost-effective impact crusher that help to overcome these crushing challenges.

In traditional hammer crushers with a top inlet, introducing large blocks in the feed can impede the action of the hammers and block the crusher. Our EV Hammer Impact Crusher, however, competently reduces quarry-size limestone boulders measuring up to 2.5 metres and weighing up to 5 tonnes to mill feed of 25 millimetres. This is a reduction ratio of 1:100 in a single operation. The EV Hammer Impact Crusher features a highly effective two-stage crushing process. Primary crushing takes place by impacting. Secondary crushing takes place by shearing and compression between the impact hammers and the breaker plate and between the hammers and the outlet grate. This ensures that even the smallest particles absorb energy and that no oversized particles leave the hammer impact crusher. The horizontal feed system can also tolerate coarse feed blocks because of its shock-absorbing inlet rollers.

The EV Hammer Impact Crushers throughput capacities range up to 2200 tonnes per hour (tph) with an outlet grate and 2500 tph without an outlet grate. Motor sizes are typically in the range of 500 - 2500 kW.

The hammer rows, which can vary depending on your crushing capacity needs, are arranged to provide complete coverage across the outlet grate. By arranging them in this way, the raw material can be crushed at multiple points increasing overall efficiency.

Adjustment of the spacing between the hammers, breaker plate and outlet grate can be optimised to compensate for hammer wear. Even when the hammers lose up to 30 percent of their original weight, the required product size curve is unaffected.

The adjustable outlet grate gives the EV Hammer Impact Crusher control of the maximum size of the product. The grate ensures a consistent flow to the conveyor and protects it against any sudden impact of material leaving the impact crusher at high speed. The grate also protects other nearby machinery from being damaged during operation.

The hold-up mechanism of the outlet grate generates a crushed product with a relatively high proportion of fines. In this way, more of the comminution work is moved from the less energy-efficient raw mill to the more energy-efficient hammer impact crusher.

The hammer rows are fitted in a staggered configuration to give complete coverage across the outlet grate. This provides several points for crushing of the raw materials, increasing the overall efficiency of the crusher.

The hammers are pivotally suspended from bolts and are symmetrically shaped. This reduces the full brunt from the contact between material and hammers, which protects the rotor and crusher housing. The hammers can easily be turned to reverse the leading and tracing edges for maximum service life.

Equipped with sturdy, replaceable grate bars supported by heavy cheeks, the adjustable outlet grate allows unique control of the mill feed size using hydraulic systems. This ensures a consistent flow to the conveyor. The outlet grate also serves as protection for the conveyor and other machinery such as reclaimers, sluices and mills, against operational upsets and mechanical damage.

A horizontal feed system incorporating one or two shock-absorbing inlet rollers helps to handle coarse feed blocks. The inlet rollers accurately control the feed to the hammer impact crusher and ensure a smooth and even flow of material. Whether one or two inlet rollers are used depends on the method of feeding the crusher.

Bolted-on, wear-resistant plates protect all exposed surfaces, including the adjustable breaker plates, from abrasive feed materials. The inlet rollers of the horizontal feed system consist of a cylinder and a concentric shaft driven by a separate motor. Rubber pads inserted between the shaft and the cylinder make the inlet rollers shock absorbent.

The hammer rotor assembly consists of a heavy-duty, forged shaft with a square cross section and is also fitted with rotor discs. The unique sandwich assembly of the discs is a robust construction, that helps prevent distortion and crack formation.

The top part of the EV Hammer Impact Crusher can be accessed by means of hydraulic cylinders. The supply package includes hydraulically-operated tools for fitting and dismantling of the heavy hammer bolts.

The hydraulic cylinders and tools are served by a mobile hydraulic power unit which can be stored in a separate room when not in use. A lifting yoke facilitates handling of the hammer rows when changing hammers. It also holds them in position when dismantling and fitting hammer bolts.

FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.

precalciner calciner in cement plant, cement calciner | calciner for sale

precalciner calciner in cement plant, cement calciner | calciner for sale

What is pre-decomposition technology? The core of the new dry process cement plant is suspension preheating technology and pre-decomposition technology. The clinker pre-decomposition technology refers to adding a new heat source, precalciner, between preheater and cement rotary kiln. When the fuel is injected into the precalciner for combustion, the raw material preheated to about 750 by cement preheater is fed into the precalciner at the same time so that the exothermic process of fuel combustion and the endothermic process of carbonate decomposition in the raw meal is carried out rapidly. Generally speaking, the cement raw meal decomposition rate can reach more than 90% before entering the rotary kiln.

What is precalciner? Precalciner, also known as cement calciner, is a kind of high-efficiency direct combustion solid-gas heat exchange cement equipment. It disperses and suspends cement raw meal powder in airflow, making fuel combustion and calcium carbonate decomposition happen in a short time (generally 1.5 ~ 3 seconds). To some extent, it replaces part of the calcining work of a cement rotary kiln. In the calciner, because the fuel combustion and the material endothermic reaction are carried out at the same time, there is no visible flame, but in a state of low-temperature flameless combustion at 820 ~ 900 .

At present, more than a dozen types of precalciners have been put into use. Although each has its advantages, its characteristics and functions are similar. According to the different movement form of airflow, calciner in cement plant can be divided into four types:

The tertiary air with a temperature of 200 ~ 250 is blown into the air chamber of the fluidized bed calciner by a high-pressure fan and then enters the inner chamber through the air cap so that the fuel and raw materials form afluid-bed.

The preheated cement raw meal (temperature is about 820 ~ 860, not exceeding 860), a certain amount of fuel, and hot air (kiln tail flue gas or tertiary hot air) are fed into precalciner at the same time. After entering the calciner, the fuel and raw meals are dispersed by high-speed airflow and in a suspension state at about 900. The fuel is flameless combustion in the calciner, and the heat released by it makes the calcium carbonate in the raw meal decompose at a high speed through a convection heat transfer and radiation heat transfer. Generally, this decomposition process can be completed in a few seconds, and the decomposition rate of the whole raw meal is as high as 85% ~ 95%, forming an efficient operation mode of combustion, exothermic, endothermic, and decomposition at the same time.

Precalciner forms the clinker calcining system in the new dry process cement plant together with cement preheater, rotary kiln, and cement cooler. In addition to cement calciner, AGICO also provides other high-quality clinker calcination equipment, such as cyclone preheater, cement rotary kiln, grate cooler, rotary cooler, etc.

AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.

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