2500TPD new type dry process cement clinker production line

2500t/d new dry process cement clinker production line

product description

The 2500t/d cement clinker production line adopts the new dry process, with an annual output of 775,000 tons of cement clinker, and a total output of 1.05 million tons of cement per year. The construction of cement production lines and auxiliary facilities from limestone crushing to cement packaging. Specialties include raw materials, production technology, electrical and automation, water supply and drainage, HVAC and fire protection, building structure, environmental protection, etc. The cement products are calibrated according to the Chinese standard ordinary Portland cement.

Process parameters

(1) Clinker output: ≥2500 t/d;

(2) Heat consumption of clinker firing

(3) Comprehensive power consumption of clinker

(4) Comprehensive electricity consumption of cement

(5) 28-day strength of clinker

(6) Dust emission concentration

production method

Cement production uses limestone and clay as the main raw materials, which are crushed, batched, and ground through a vertical mill to make raw materials, and then fed into the cement rotary kiln to calcinate mature materials, and then add appropriate amount of gypsum to the clinker, and add some mixed materials or The admixture is ground into cement by cement mill and transported by packing machine or bulk machine. The cement production equipment adopts the dry-process cement production process. The raw materials are dried and ground into raw meal powder, and then fed into the dry-process rotary kiln to calcinate mature materials. The main advantage of dry-process production is low heat consumption.

Process description

1. Limestone crushing The dump truck pours the limestone into the hopper, after being crushed by the hammer crusher, it is sent to the limestone pre-homogenization yard by the belt conveyor, and the cantilever stacker is used for layered stacking and reclaiming. The taken-out limestone is sent to the limestone batching bin of the raw material batching station by a belt conveyor. An electromagnetic iron remover is installed on the silo belt conveyor to remove possible iron parts in the limestone. There is a metal detector at the head of the belt conveyor to detect whether there are iron parts in the raw material, so as to avoid damage to the raw material grinding roller press. The raw material batching station is equipped with batching bins such as limestone and clay. The bottom of each batching bin is equipped with a plate feeder and a quantitative feeder. The four raw materials are discharged by their respective quantitative feeders according to the proportion required by the ingredients, and the batch materials are fed into the raw material vertical mill via a belt conveyor.

2. The raw material grinding adopts a vertical roller mill system, which uses the high temperature exhaust gas discharged from the kiln tail as the drying heat source. After the material is ground by the vertical mill, it is dried and classified by the V-type powder separator. After the fine powder is selected by the high-efficiency powder separator, a part of the fine powder is sent to the raw material homogenization silo through the air conveying chute and bucket elevator .

3. The coal mill is installed at the end of the kiln, and a part of the exhaust gas from the kiln end is collected by the cyclone dust collector and used as the drying heat source of the raw coal. After the kiln tail gas is humidified and cooled by the humidification tower, it directly enters the kiln tail electric precipitator. The water spray volume of the humidification tower is automatically controlled according to the temperature of the exhaust gas at the outlet of the humidification tower, so that the temperature of the exhaust gas is within the allowable range of the kiln tail electric precipitator Inside, the exhaust gas purified by the dust collector is discharged into the atmosphere by the exhaust fan. The kiln dust collected by the humidification tower is sent to the kiln feeding system or raw meal homogenization silo by conveying equipment. Set up a continuous raw meal homogenization storehouse, the raw meal in the storehouse is discharged from the peripheral annular area to the mixing chamber after being inflated alternately, where the raw meal is aerated and stirred evenly in the mixing chamber. The required air charge at the bottom of the silo is supplied by the equipped Roots blower. After the homogenized raw meal powder is metered, it is fed into the two inlets of the dual series preheater through the air conveying chute and the bucket elevator, and then through the distribution valve and the air lock valve.

4. The firing workshop is composed of five-stage double series suspension preheater, decomposition furnace, rotary kiln, grate cooler and corresponding dust removal system, with a daily output of 2500t of cement clinker. After the raw meal fed into the preheater is preheated by the preheater and decomposed in the decomposition furnace, it is fed into the kiln for calcination; the high temperature clinker leaving the kiln is cooled in the grate cooler, and the large pieces of clinker are crushed by the crusher , The small clinker that is collected and leaked to the bottom of the air chamber is sent to the clinker warehouse by the clinker chain hopper conveyor for storage. The hot air passing through the clinker bed provides high-temperature secondary air and tertiary air to the kiln and calciner respectively, and the exhaust gas is purified by an electric dust collector and discharged into the atmosphere by an exhaust fan. After the clinker is discharged by the unloading device at the bottom of the silo, it is sent to the automobile bulk loading station by a belt conveyor, and the clinker for bulk outbound transportation is directly loaded into the truck through the dust-free bulk head set at the bottom of each silo.

5. The preparation of pulverized coal adopts a grinding system, using high-temperature exhaust gas discharged from the kiln tail as the drying heat source. The raw coal is fed into the coal mill by a metering feeder under the raw coal bunker for drying and grinding. The pulverized coal is discharged into the bag filter along with the airflow. The qualified pulverized coal is collected and sent by the screw conveyor with a load sensor. Pulverized coal silo. After being measured, the pulverized coal is sent to the kiln head burner and the kiln tail calciner to burn. The dust-containing gas is discharged into the atmosphere by an exhaust fan after being purified by an anti-static bag filter. Both the pulverized coal silo and the bag filter are equipped with CO detectors and explosion-proof valves. The whole plant has a central laboratory, which is responsible for the inspection of raw materials, semi-finished products and finished products of the whole plant. An air compressor station is also set up to supply compressed air for the whole plant.

6. The cement batching adopts grinding head bin batching, and the grinder uses a φ3.2×13m cement mill, and the roller press is matched according to the situation to achieve a cement output of 180 t/h. The finished cement is pneumatically transported by a double bin pump In the original cement warehouse.

There are 4 φ12×42m round warehouses for cement storage, with a total reserve of 20,000t and a storage period of 4.6d. The finished cement product from the cement grinding system is pneumatically transported to the cement storage system. The cement warehouse is equipped with a discharge decompression conical chamber and an aeration device. The gas source required for aeration is provided by a Roots blower. The cement packaging workshop is equipped with two eight-nozzle rotary packaging machines with a single output of 90-100t/h.