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Energy-saving Cement And Limestone Rotary Kiln for 2015 Hot sell well

Xinxiang City Hongfeng Mine Equipment Co., Ltd.
Xinxiang City Hongfeng Mine Equipment Co., Ltd.
City: Xinxiang
Province/State: Henan
Tel: 86-371-6090101
Contact Person:
Mr. William

Energy-saving Cement And Limestone Rotary Kiln for 2015 Hot sell well

Place of Origin : China
Brand Name : YuKuang
Certification : ISO 9001:2008 & ISO 14001:2004
Model Number : 1
MOQ : 1
Price : 1000
Packaging Details : box
Delivery Time : one week
Payment Terms : T/T,D/P,L/C
Supply Ability : 100
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Principle of Operation

The kiln is a cylindrical vessel, inclined slightly to the horizontal, which is rotated slowly about its axis. The material to be processed is fed into the upper end of the cylinder. As the kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. Hot gases pass along the kiln, sometimes in the same direction as the process material (co-current), but usually in the opposite direction (counter-current). The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. Such a flame is projected from a burner-pipe (or "firing pipe") which acts like a large bunsen burner. The fuel for this may be gas, oil or pulverized coal.

Construction

The basic components of a rotary kiln are the shell, the refractory lining, support tyres and rollers, drive gear and internal heat exchangers.

Kiln Shell

This is made from rolled mild steel plate, usually between 15 and 30 mm thick, welded to form a cylinder which may be up to 230 m in length and up to 6 m in diameter. This will be usually situated on an east/west axis to prevent eddy currents.

Upper limits on diameter are set by the tendency of the shell to deform under its own weight to an oval cross section, with consequent flexure during rotation. Length is not necessarily limited, but it becomes difficult to cope with changes in length on heating and cooling (typically around 0.1 to 0.5% of the length) if the kiln is very long.

Refractory Lining

The purpose of the refractory lining is to insulate the steel shell from the high temperatures inside the kiln, and to protect it from the corrosive properties of the process material. It may consist of refractory bricks or cast refractory concrete, or may be absent in zones of the kiln that are below around 250°C. The refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed. In some processes, such as cement, the refractory life is prolonged by maintaining a coating of the processed material on the refractory surface. The thickness of the lining is generally in the range 80 to 300 mm. A typical refractory will be capable of maintaining a temperature drop of 1000°C or more between its hot and cold faces. The shell temperature needs to be maintained below around 350°C in order to protect the steel from damage, and continuous infrared scanners are used to give early warning of "hot-spots" indicative of refractory failure.

Tyres and Rollers


Kiln tyre closeup showing typical chair arrangement

Tyres, sometimes called riding rings, usually consist of a single annular steel casting, machined to a smooth cylindrical surface, which attach loosely to the kiln shell through a variety of "chair" arrangements. These require some ingenuity of design, since the tyre must fit the shell snugly, but also allow thermal movement. The tyre rides on pairs of steel rollers, also machined to a smooth cylindrical surface, and set about half a kiln-diameter apart. The rollers must support the kiln, and allow rotation that is as nearly frictionless as possible. A well-engineered kiln, when the power is cut off, will swing pendulum-like many times before coming to rest. The mass of a typical 6 x 60 m kiln, including refractories and feed, is around 1100 tonnes, and would be carried on three tyres and sets of rollers, spaced along the length of the kiln. The longest kilns may have 8 sets of rollers, while very short kilns may have only two. Kilns usually rotate at 0.5 to 2 rpm, but sometimes as fast as 5 rpm. The Kilns of most modern cement plants are running at 4 to 5 rpm. The bearings of the rollers must be capable of withstanding the large static and live loads involved, and must be carefully protected from the heat of the kiln and the ingress of dust. In addition to support rollers, there are usually upper and lower "retaining (or thrust) rollers" bearing against the side of tyres, that prevent the kiln from slipping off the support rollers.

Friction between tyre and rollers, causes concave, convex or conical wear on both surfaces of tyre and rollers. This wear deforms the cylindrical shape of these units and causes vibration, shell deformation, more power consumption and if not resurfaced these problems takes the level up to changing the shell and tyre which takes more budget and shut down time.

Technical Parameters of Rotary Kiln:


Model(mm)Kiln sizeCapacity(t/h)Rotation speed(r/min)Motor power(kw)Weight(t)Remark
Diameter(m)Length(m)Inclination angle(%)
1.4*331.43330.9-1.30.39-3.9618.547.5---
1.6x361.63641.2-1.90.26-2.632252---
1.8x451.84541.9-2.40.16-1.623078.2---
1.9x391.93941.65-30.29-2.933077.59---
2.0x4024032.5-40.23-2.2637119.1---
2.2x452.2453.53.4-5.40.21-2.4445128.3---
2.5x402.5403.59.0-10.50.44-2.4455149.61---
2.5x502.55036.25-7.40.62-1.8655187.37---
2.5x542.5543.56.9-8.50.48-1.4555196.29---
2.7x422.7423.510.0-11.00.10-1.5255198.5---
2.8x442.8443.512.5-13.50.437-2.1855201.58Suspension preheating kiln
3.0x453453.512.8-14.50.5-2.4775210.94---
3.0x483483.525.6-29.30.6-3.48100237Outside disassemble kiln
3.0x603603.512.3-14.10.3-2100310
3.2x503.250440.5-420.6-3125278Outside disassemble kiln

Henan YuKuang Machinery Co., Ltd.

Mobile: +86-15333827088 +86-371-63712098

Email: 15333827088@163.com

QQ: 282446231

Website: http://www.cncrusher.com/


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