CN2211582Y

CN2211582Y - High performance vertical preheater for cement rotary kiln

Info

Publication number: CN2211582Y
Application number: CN 94245416
Authority: CN
Inventors: 江瑞莲; 陈华奎
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-21
Filing date: 1994-11-21
Publication date: 1995-11-01
Anticipated expiration: 2004-11-21

Abstract

The utility model relates to a high performance vertical preheater for cement rotary kiln. The feathers of the utility model lie in that on the basis of the original vertical cylinder pre-heater, a plurality of ofcoal fines spraying and burning pipes are added, and tertiary air flown out from a clinker cooler at the head portion of the kiln are introduced into the vertical cylinder pre-heater to support combustion for the coal fines; the temperature of the vertical cylinder is added to increase the decomposing rate of the caco 3 in the raw material in the vertical cylinder; in addition, a necking ring is added and equipped in the vertical cylinder preheater to make the raw material powder and the air current form a suspending vortex flow above the necking ring and below the necking ring which sufficiently contacts with the hot gas flow; the utility model is favorable for heat transferring.

Description

High performance vertical preheater for cement rotary kiln

The utility model is a kind of efficient shaft preheater that is used for cement raw material preheating and predecomposition, belongs to the plant equipment that cement industry is used.

Shaft preheater is just installed at the kiln tail by China's rotary kiln cement factory since the sixties, allow into the kiln raw material in upright tube with the heat exchange that suspends of the high hot waste gas of kiln tail, make into the raising of kiln raw material temperature and make wherein CaCO ₃Part predecomposition is to improve the output of kiln.After the seventies, domestic and international application the outer using predecomposition technology of kiln, this technology is to set up dore furnace on the basis that utilizes kiln tail waste hot gas, fuel (oil, gas, coal) is fed predecomposition furnace, increase heat energy, make raw material fully predecomposition in stove, resolution ratio is up to more than 80%, the output of kiln is compared with the pre-heating kiln of upright tube that suspends, improve output 80～100%, will very high investment but build this precalciner kiln, the device structure complexity, automatization level requires very high, and general middle-size and small-size cement plant is difficult to adopt.

Task of the present utility model is that the advanced technology of predecomposition is transplanted in the shaft preheater technology, and original shaft preheater technical equipment is simple keeping, small investment, skinning does not stop up, and is easy to operate, manageability, under the prerequisite of being convenient to control, allow shaft preheater have the function of predecomposition furnace concurrently, promptly at the shaft preheater inwall, install several coal dust spray combustion pipes, the ejection coal dust firing, to improve space calorific intensity in the shaft preheater greatly, the very big resolution ratio of calcium carbonate in the raising raw material of degree.Thereby improve the output of rotary kiln.

The efficient shaft preheater of the utility model cement rotary kiln, base are mainly by upright tube 8, and raw material feed pipe 7, exhanst gas outlet 11, coal dust spray and fire pipe 6, necking down ring 5, and tertiary air inlet 4, kiln tail rising smoke inlet 3, raw material discharge port 9 constitutes; Upright tube 8 is the steel cylinder of liner refractory liner, the stage casing is provided with the necking down ring 5 that refractory material is made in the tube, have kiln tail rising smoke inlet 3 on the necking down ring lower sidewalls, be connected with kiln tail smoke-box by uptake flue, have tertiary air inlet 4 on the sidewall in addition, link to each other with kiln hood portion chamotte cooler by tertiary-air pipe; Respectively have several coal dust spray combustion pipe 6 inlets in necking down ring 5 above and belows, join by pipeline and coal dust feed system and primary air fan; Be provided with raw material feed pipe 7 on shaft preheater top, the top is provided with exhanst gas outlet 11, and the lower end is provided with discharge port, takes back rotary kiln feed pipe 9, will be through preheating, and predecomposition raw material feeding rotary kiln tail end.On the barrel at coal dust spray combustion tube inlet place, have outer greatly tubaeform mouthful in little, can regulate the coal dust spray and fire the angle that pipe sprays into coal dust formation flame.Spray combustion pipe is for the ratio of adjustable coal saving powder of multi-channel structure and a wind, to regulate flame.Refractory material necking down ring 5 in the preheater plays the regulating action that flame is separated, and can prolong the time of contact of hot-fluid and materials flow, with abundant heat transfer.

The utility model has the advantages that allow raw material before going into kiln by efficient shaft preheater in tube from top to bottom helical form descend, by the hot flue gas of kiln tail that rises below, add the coal dust that coal dust spray combustion pipe sprays into again, by the combustion-supporting burning of tertiary air, improve the temperature in the upright tube, can fully contact with the raw material that descend again, carry out sufficient preheating and predecomposition, improve the resolution ratio of calcium carbonate in the raw material.Present technique equipment is simple, and small investment is made easily and installed, easy operating and management, and annual running rate can reach more than 85%.

Description of drawings:

Fig. 1 is the structural representation of cement rotary kiln with efficient shaft preheater.

Number 1 among the figure, the bed of material in the rotary kiln; 2, rotary kiln; 3, kiln tail rising smoke inlet; 4, tertiary air inlet; 5, necking down ring; 7, raw material feed pipe; 8, upright tube; 9, discharge port; 10, kiln tail smoke-box;

Arrow among the figure

Flue gas stream

Three hot blasts

Raw material stream

Embodiment:

Because the coal-fired powder of spray has improved an interior temperature in shaft preheater, makes shaft preheater have the effect of predecomposition furnace concurrently, the output of kiln improves greatly, prepare the not shaft preheater of Coal powder spray on certain the φ 3 * φ 8m of factory rotary kiln, output be 14 tons/time, if spray into coal dust about 10%, cold wind is combustion-supporting, its output be 18 tons/time, improve output 20%, when injecting coal quantity is 50%, output by 14 tons before the Coal powder spray not/time bring up to 27 tons/time, and its coal consumption has also reduced by 10%.

Claims

1, the efficient shaft preheater of a kind of cement rotary kiln is characterized in that: mainly by upright tube 8 raw material feed pipes 7, and exhanst gas outlet 11, coal dust spray combustion pipe 6, necking down ring 5, tertiary air inlet 4, kiln tail rising smoke inlet 3, raw material discharge port 9 constitutes; Upright tube 8 is the steel cylinder of liner refractory liner, the necking down ring 5 that the useful refractory material in stage casing is made in the tube, have kiln tail rising smoke inlet 3 on the necking down ring lower sidewalls, be connected with kiln tail smoke-box by uptake flue, have tertiary air inlet 4 on the sidewall in addition, link to each other with kiln hood portion chamotte cooler by tertiary-air pipe; Respectively have several coal dust spray combustion pipe 6 inlets in necking down ring 5 above and belows, join by pipeline and coal dust feed system and primary air fan; Be provided with raw material feed pipe 7 on shaft preheater top, the top is provided with exhanst gas outlet 11, and the lower end is provided with discharge port, takes back rotary kiln feed pipe 9.

2, the efficient shaft preheater of rotary kiln according to claim 1 is characterized in that described coal dust spray combustion pipe 6 porch, on upright barrel, have outer little in big tubaeform mouth.

3, the efficient shaft preheater of rotary kiln according to claim 1 is characterized in that described coal dust spray combustion pipe is multi-channel structure.