CN1473784A

CN1473784A - Large tilt rotary kiln cement calcining process and rotary kiln

Info

Publication number: CN1473784A
Application number: CNA031355692A
Authority: CN
Inventors: 余世华
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-08
Filing date: 2003-08-08
Publication date: 2004-02-11

Abstract

The present invention discloses a kind of great tilt rotary kiln and its cement calcining process. After black raw material pellet produced in traditional technological process is fed into the kiln, the material pellet is first dried, preheated, dewatered and carbonate decomposed in the preheating belt; and then calcined into cement clinker via solid and liquid chemical reaction in the calcination belt. Calcined cement clinker is cooled in cooling belt and crushed in crushing cavity before discharged out of the kiln. The rotation of the kiln makes the material contact with oxygen homogeneously and this results in homogeneous quality and high yield of cement product.

Description

Big obliquity calcined by rotary kiln cement industry and rotary kiln

Technical field:

The present invention relates to calcining process and equipment that a kind of manufacture of cement is used.

Technical background:

Calcined by rotary kiln cement clinker technology, no matter be wet method, dry method or semidrying, material calcination process of clinkering zone in kiln is basic identical.Biggest advantage is stirring of not stopping along with the rotation of kiln in kiln of material (piece), conducts heat evenly, and sufficient reacting, the clinker quality that burns till is stable, and effectively mineral are many and distribute rationally the intensity height.But the common problem of rotary kiln is that the material filling ratio is low in the kiln, the calcining temperature height, and thermo-efficiency is low, and energy consumption is big.The outer decomposition technique of band preheater kiln and kiln is international advanced technologies, but investment is big, technical sophistication; The long firer of the wet method floor space of planting is big, and thermo-efficiency is minimum, cost height, separate unit kiln dimension-limited system; The wet grinding and dry burning technology is also complicated, and investment is high, and dry method hollow kiln environmental protection difficulty is big, also the row of eliminating.

It is simple that mechanical shaft kiln burning cement clinker technology has equipment, material filling ratio height in the kiln, and calcining temperature is low, the thermo-efficiency height, less investment, floor space is little, and technology is characteristics such as grasp easily.But the ubiquitous disadvantage of vertical kiln process is that calcining is inhomogeneous in the kiln, reacts insufficient, and stability is poor, and clinker strength is low, and the quality product fluctuation is big, has limited the use range of product, has restricted the further performance of business economic benefit.The object that becomes national industrial policies restriction development and eliminate.And the major cause of its processing quality defective, except going into the batching before the kiln, coal blending outside the reasons (these reasons are by strengthening management, and the state of the art that improves equipment is soluble fully) such as the homogeneity control of raw material and balling-up quality, also has following reason:

1, the machine shaft kiln is a static equipment, drying, dehydration, the carbonate decomposition of pellet in kiln, burn till reaction and form in the carbonate minerals process, and be to do to move vertically downward all the time, almost upset or section do not move pellet;

2, because the kiln wall effect that kiln structure produces, each band, each layer material pressure and section skewness cause the kiln ventilation resistance big and ventilate inhomogeneously, and part of fuel can not perfect combustion, and the reaction of part pellet is insufficient, forms the incinerating ununiformity;

3, enter cooling zone after, exist inhomogeneous cooling even equally, be unfavorable for the chilling and the crystal conversion of part grog, reduced the intensity and the grindability of grog.

By above-mentioned analysis as can be seen, pellet is done almost static vertical descending motion in shaft kiln, be cause ventilation resistance big, ventilate inhomogeneous and raw material ball is calcined uneven major cause in kiln, this also is the critical defect of vertical kiln process.In recent decades, many people study, tackle key problems, and adopt to strengthen middle part ventilations, waist wind, improve method such as discharging double-edged fine-toothed comb form repeatedly and improve ventilation, all do not tackle the problem at its root.The inclined to one side fire that occurs frequently in the machine vertical kiln operation process, the kiln of making somebody a mere figurehead, collapse, spray kiln cause human casualty accident etc., have exposed the deficiency of vertical kiln process more.

Summary of the invention:

The objective of the invention is to: provide a kind of kiln body to be big obliquity, rotating speed can be regulated and control, pellet rotation with kiln in kiln is kinestate, make fuel in the pellet obtain perfect combustion, pellet obtains fully calcined cement clinker calcining process and equipment, to overcome the deficiencies in the prior art.

The present invention is achieved in that and makes the black meal ball with traditional technology earlier, pellet is in tremie pipe (7) adds kiln body (1), pellet stirs along with the running of kiln in a of preheating zone, the warm air that rises from clinkering zone b can carry out drying, preheating to the pellet that enters a of preheating zone equably, dehydration, carbonate decomposition; Enter clinkering zone b then; Pellet is still ceaselessly upset, displacement in combustion processes, and when the temperature of clinkering zone b reached 1450 ℃, material generated cement clinker mineral through solid phase, liquid-phase chemical reaction, and the grog that burns till descends to rolling and enters cooling zone c; The normal temperature high voltage air that is blasted by central air hose axle (3) carries out heat exchange with high temperature chamotte on the one hand, the cooling grog on the other hand with preheating of air, enters clinkering zone b again for fuel combustion, cooled grog enters crusher chamber, is unloaded outside the kiln discharge by discharge opening (12) after fragmentation.

The formation of tilting rotary table kiln of the present invention: it is by kiln body (1), kiln hood cover (2), and central air hose axle (3), retarding mechanism (4) is formed, and kiln body (1) is skewed placement, and its angle of inclination is 12 °～18 °; Kiln hood cover (2) covers on the upper end of kiln body (1), and tremie pipe (7) penetrates kiln hood cover (2); Central air hose axle (3) penetrates from kiln body (1) lower end, and tower tray (8) is housed on central air hose axle (3), and the front end of tower tray (8) is equipped with loosening device (9), and the broken jaw tooth (10) of deciding is housed in tower tray (8) rear end, and broken moving jaw tooth (11) is contained on the kiln body (1); Retarding mechanism (4) is in the stage casing of kiln body (1), cooperates with the transmission master wheel (5) that is connected as a single entity with kiln body (1), is provided with carrying roller (6) in the both sides of transmission master wheel (5); Be provided with discharge opening (12) in the lower end of kiln body (1).

The present invention compared with prior art, because the running of kiln body, material continuous flip-flop movement twist in kiln has equal opportunities the pellet ingress of air, the oxygen supply unanimity, conduct heat evenly, sufficient reacting, each pellet can both obtain fully calcined, impel free calcium oxide absorption in the grog, increase effective mineral content, quality is all neat, near or catch up with the clinker quality level of precalciner kiln; Because the filling ratio height in the tilting rotary table kiln can reach 70～80%, the common problem that has overcome existing rotary kiln again is that the material filling ratio is low in the kiln, calcining temperature height, problem such as thermo-efficiency is low, and energy consumption is big.1 square metre of area output can reach more than 2 tons.

Description of drawings:

Accompanying drawing 1 is a process principle figure of the present invention;

Accompanying drawing 2 is the present device schematic diagram;

Accompanying drawing 3 is the synoptic diagram of the broken jaw tooth of the present invention.

Embodiment:

Embodiments of the invention: make the black meal ball with traditional technology earlier, pellet is in tremie pipe (7) adds kiln body (1), kiln body (1) rotates under the drive of retarding mechanism (4), transmission master wheel (5), driving pellet stirs along with the running of kiln in a of preheating zone, the waste gas that clinkering zone b discharges enters preheating zone a pellet is carried out drying, preheating, dehydration, carbonate decomposition; Pellet enters clinkering zone b then; Still ceaselessly upset, displacement in combustion processes, when the temperature of clinkering zone b reached 1450 ℃, material generated cement clinker mineral through solid phase, liquid-phase chemical reaction, and the grog that burns till descends to rolling and enters cooling zone c; The normal temperature high voltage air that is blasted by central air hose axle (3) carries out heat exchange with high temperature chamotte on the one hand, the cooling grog, on the other hand with preheating of air, enter clinkering zone b again for fuel combustion, cooled grog enters crusher chamber, decide jaw tooth (10) through the fragmentation that is contained on the tower tray (8), the broken back of the moving jaw tooth (11) of fragmentation that is contained in the kiln body (1) is unloaded outside the kiln discharge by discharge opening (12).

Kiln body (1) is held up by two row's carrying rollers (6), is 15 ° of inclinations; The waste gas that burning produces is discharged by the smoke outlet on the kiln hood cover (2) and is collected.

Claims

1, a kind of big obliquity calcined by rotary kiln cement industry, it is characterized in that: make the black meal ball with traditional technology earlier, pellet is in tremie pipe (7) adds kiln body (1), pellet stirs along with the running of kiln in a of preheating zone, the warm air that rises from clinkering zone b can carry out drying, preheating to the pellet a of preheating zone equably, dehydration, carbonate decomposition; Enter clinkering zone b then; Pellet is still ceaselessly upset, displacement in combustion processes, and when the temperature of clinkering zone b reached 1450 ℃, material generated cement clinker mineral through solid phase, liquid-phase chemical reaction, and the grog that burns till descends to rolling and enters cooling zone c; The normal temperature high voltage air that is blasted by central air hose axle (3) carries out heat exchange with high temperature chamotte on the one hand, the cooling grog on the other hand with preheating of air, enters clinkering zone b again for fuel combustion, cooled grog enters crusher chamber, is unloaded outside the kiln discharge by discharge opening (12) after fragmentation.

2, a kind of tilting rotary table kiln, it is by kiln body (1), kiln hood cover (2), central air hose axle (3), retarding mechanism (4) is formed, and it is characterized in that: kiln body (1) is skewed placement, and its angle of inclination is 12 °～18 °; Kiln hood cover (2) covers on the upper end of kiln body (1), and tremie pipe (7) penetrates kiln hood cover (2); Central air hose axle (3) penetrates from kiln body (1) lower end, and tower tray (8) is housed on central air hose axle (3), and the front end of tower tray (8) is equipped with loosening device (9), and the broken jaw tooth (10) of deciding is housed in tower tray (8) rear end, and broken moving jaw tooth (11) is contained on the kiln body (1); Retarding mechanism (4) is in the stage casing of kiln body (1), cooperates with the transmission master wheel (5) that is connected as a single entity with kiln body (1), is provided with carrying roller (6) in the both sides of transmission master wheel (5); Be provided with discharge opening (12) in the lower end of kiln body (1).