Tongli cyclone pre-heater Introduction

A cyclone preheater, also known as a cyclone preheater tower, is a component used in cement production plant and other industrial processes to enhance the efficiency of the production process by preheating the raw materials before they enter the kiln. The main purpose of a cyclone preheater is to minimize the energy required for the chemical reactions that occur within the rotary kiln and to reduce the overall fuel consumption in the cement manufacturing process. In cement production, the raw materials (such as limestone, clay, shale, etc.) need to be heated to a high temperature in a kiln to undergo chemical reactions that transform them into clinker, which is the intermediate product used to make cement. The process of heating these raw materials requires a significant amount of energy. A cyclone preheater helps to reduce this energy demand by preheating the raw materials using the waste heat from the kiln exhaust gases.

Tongli cyclone pre-heater structure

The feeding method and structure can ensure a safe airtightness when feeding into the preheater body, so that the cold air from the outside cannot enter the preheater, and the feeding can be realized continuously or intermittently by means of a rod valve.

Liner:The refractory brick lining structure is the most important part to ensure the left and right sides of the material. It is composed of a preheating chamber, a suspension device and a refractory brick lining. The structure of this part is mostly metal components, and some materials are selected from heat-resistant steel according to the needs. The heat-resistant steel can work at a high temperature of 1000~1100 degrees Celsius. In addition, the refractory brick lining has a novel structure design and good sealing perform ancestry, Which can ensure that the materials are evenly preheated in the preheater and reach the preheating temperature.

Pushing device: It mainly includes the push head, frame and connecting rod. The push head is cast or welded with heat-resistant steel, which can withstand high temperature. With the help of electric control and hydraulic system, each hydraulic push rod can be controlled according to the automatic control program. Realize sequential pushing.

Hydraulic system: mainly includes oil tank, oil pump, motor, solenoid valve, hydraulic oil pipe, etc. Its main function is to control the pushing device and complete the pushing action.The main body of the feeding chamber, the feeding nozzle, etc. Its main function is to introduce the preheated materials into the rotary kiln for calcination.

Frame: It mainly includes columns, ring beams, etc., and its main function is to carry the upper structure of the preheater.

Tongli cyclone pre-heater design principle

As the unprocessed material enters the upper part of the slender, tall cyclone, a synergy of gravity, inertia, and the centrifugal force generated by the swirling exhaust gas sets it into a downward spiraling motion within the circular region formed between the outer cyclone wall and the inner cylinder (exhaust outlet). This motion continues until the material reaches the cyclone's base. At this point, the material becomes detached from the airstream, settling down. 

It then proceeds through the feeding pipe, engaging in a thermal exchange with the exhaust gas before advancing into the subsequent cyclone alongside it. Following this, the majority of the coarse powder is separated from the exhaust gas due to centrifugal force. This powder is released from the discharge pipe in the same stage, descending by the force of gravity into the exhaust pipe of the next cyclone. Here, it undergoes further heat exchange with the hotter waste gas. Meanwhile, the waste gas, carrying the finer powder, continues its rotation and ascent within the negative pressure environment created by the fan. Eventually, this waste gas, along with the fine powder, is expelled from the uppermost air outlet of the cyclone.

Specifications of tongli cyclone pre-heater

Note: *capacity may vary according to specific material.

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Industry Knowledge extension

What is the application of cyclone pre heater?

Cement Production: Cyclone pre-heaters are extensively used in cement manufacturing plants. In the cement production process, raw materials such as limestone, clay, and other minerals are fed into the cyclone pre-heater. As the materials move upward through the cyclones, they are subjected to hot gases that are generated in the lower part of the pre-heater. This preheating of raw materials significantly reduces the energy required in the subsequent kiln phase and contributes to the overall efficiency of cement production.

What is cement grinding plant?

A cement grinding plant is a facility that processes raw materials such as clinker, gypsum, and other additives to produce cement. Cement is a crucial building material used in various construction projects, and its production involves several stages, with grinding being one of the important processes.

The main components of cement are clinker and gypsum. Clinker is a nodular material produced by heating a mixture of limestone, clay, and other raw materials at high temperatures in a kiln. After the clinker is cooled, it is finely ground together with gypsum and other additives to produce the final cement product.

The cement grinding plant specifically focuses on the grinding of clinker into a fine powder. This process involves using various types of grinding mills, such as ball mills, vertical roller mills, or other specialized machinery. The purpose of grinding is to increase the surface area of the clinker particles, allowing for better hydration and development of cementitious properties when mixed with water. The addition of gypsum helps to regulate the setting time of the cement.