CN2316617Y

CN2316617Y - Furnace for pre-decomposition of pellet

Info

Publication number: CN2316617Y
Application number: CN 97245342
Authority: CN
Inventors: 马殿杨; 马力峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-09-30
Filing date: 1997-09-30
Publication date: 1999-04-28
Anticipated expiration: 2007-09-30

Abstract

The utility model belongs to a material pre-decomposition furnace, which is arranged in the front of a cement clinker calcining rotary kiln. The center point of the top part of a furnace body 17 is provided with a material barrel 3, the side surface of the material barrel 3 is provided with a gas outlet 2, a tapered material distributor 4 is fixed in the furnace body which is arranged below the material barrel 3, an annular blanking passage which is composed of an inner ring folding plate 5 and an outer ring folding plate 7 is fixedly arranged between the lower end of the material distributor 4 and the lower end of the furnace body, an outer partition cavity plate 6 is fixed between the outer ring folding plate on the upper part of the blanking passage and the furnace body, wherein an inner partition cavity plate 9 is fixedly arranged on the inner ring folding plate on the lower part of the blanking passage. Material balls can be heated uniformly by the material pre-decomposition furnace, the decomposition rate is high, and the rotary kiln is caused to has the advantages of high yield, energy saving, and dust filtration.

Description

The pellet predecomposition furnace

The utility model belongs to a kind of preceding material predecomposition furnace of burning clinker of cement rotary kiln that is installed in.

When current calcining cement is ripe, before material enters into rotary kiln, all to carry out drying, preheating and predecomposition.What adopt for the predecomposition of powdery raw material is preheating of airlift whirlwind and exterior decomposing furnace of kiln, and the shortcoming of this predecomposition furnace is: one, and too tall and big kiln tail framework, large-scale preheater and conditioning Tower and indispensable cottrell, construction investment is bigger; Secondly, the resistance of system is also bigger, and it is many to leak out, and the raw material airlift, and power consumption is also very high; Its three, it is also poor to the adaptability of raw material, is prone to skinning, putty, very dangerous; Its four, when high-temperature gas and powder carry out high rate heat transport, do not possess the condition of solid phase reaction, it can prolong the process time, makes the intermediate zone in the kiln oversize.

For revolution comb formula heater (to call heater in the following text), it is the corollary equipment of lepol kiln special use, its kiln discharge thermal current is directly by the pellet layer, pellet oven dry, preheating, part are decomposed, then enter mature calcined material in the rotary kiln, its major advantage is: heat, the heat transfer that makes full use of high temperature gas flow is fast, heat consumption of clinker is low.Its major defect is: 1, the upper and lower temperature difference of pellet layer too big (differing 400-600 ℃), thereby the pellet preheating is inhomogeneous according to survey, and it is low to go into the kiln resolution ratio, and influence is calcining and clinker quality evenly.2, the heating arrangements complexity, wear-out part is many, maintenance load is big, influences the running of kiln.

The purpose of this utility model be to provide a kind of heat that can utilize high temperature gas flow fully to pellet dry, preheating, decomposition, and homogeneous heating to pellet, the resolution ratio height can be produced high-quality cement grog, can reduce the pellet predecomposition furnace of dust pollution again.

The utility model is achieved in that it comprises the body of heater of a pellet predecomposition furnace, and the lower end of this body of heater takes back rotary kiln through kiln tail smoke-box, utilize the thermal current that produced in the rotary kiln to the material in the pellet predecomposition furnace dry, preheating, decomposition.Be provided with a barrel at the top center place of body of heater, the body of heater top of barrel side is provided with exhanst gas outlet, and taper tripper of fixed installation in the body of heater below barrel, the annular blanking channel that the edge of taper tripper is made of interior ring flap and outer shroud flap to fixed installation between the flitch of body of heater lower end reducing place, between the outer shroud flap of annular blanking channel middle and upper part and body of heater, be installed with separate space plate outside, interior separate space plate of fixed installation in the formed circular hole of ring flap in the middle and lower part of annular blanking channel, by interior separate space plate and outer separate space plate annular blanking channel is divided into three sections like this, and the body of heater inner chamber is divided into four chambers from bottom to top with annular blanking channel.When thermal current is in bottom of furnace body enters into stove, in body of heater, pass successively four chambers, when each chamber of thermal current process, want to pass material bed three times, when thermal current during through the hypomere bed of material, because the temperature height of thermal current decomposes the carbonate in this section pellet.When thermal current passed through the interlude of the bed of material, thermal current dewatered and the part carbonate decomposition to the kaolin in the material.When thermal current arrived the preceding paragraph of material, the thermal current that temperature is not too high was dried and preheating material bed.

Because the utility model is that the annular blanking channel that is made of interior ring flap and outer shroud flap is installed in dore furnace, and the space of body of heater is divided into four chambers with two separate space plates, force thermal current to pass through the annular bed of material three times from bottom to top, decompose with the oven dry, preheating and the part that realize material, this predecomposition furnace is to the homogeneous heating of material, raw material (pellet) are gone into kiln resolution ratio height, and in carbonate decomposition, with solid phase reaction.The results showed, the existing lepol kiln of its kiln PR improves nearly one times, the quality of grog also is significantly improved, secondly, because thermal current wants three processes material bed, and thermal current and material bed reverse movement, every process is once material bed, will filter a part of flue dust, when it by for the last time not during heated material, the discharge capacity of flue dust is up to state standards, so this preheating decomposition furnace does not need to establish conditioning Tower and deduster, need not do kiln tail framework yet, can save a large amount of construction funds.Its three because the inleakage of this dore furnace is seldom, the air quantity that needs is also less, resistance is also lower, no matter be and existing lepol kiln heater, or the powder predecomposition furnace compares, energy consumption reduces significantly.Its four, this dore furnace relatively simple for structure, the investment that can save equipment widely.Its five, this dore furnace is strong than the powder decomposing system to raw material harmful components (chlorine, alkali, sulphur) adaptability, and production, handling safety.

Fig. 1 is a structure principle chart of the present utility model;

Fig. 2 is the a-a cutaway view of Fig. 1.

Below in conjunction with accompanying drawing the utility model is described in detail.

The body of heater 17 of the predecomposition furnace of this pellet is a cylindrical shape, also can be reducing cylindrical shape small in ends broad in the middle, is provided with a barrel 3 in the center at body of heater 17 tops, so that add material in body of heater 17.The top of the body of heater 17 around barrel 3 is provided with exhanst gas outlet 2, so that the flue gas in the stove is discharged.Gas outlet 2 is preferably established 2 or 3, the center symmetric arrays.Taper tripper 4 of fixed installation in the body of heater 17 below barrel 3, the material that will from barrel 3, fall assign to equably in the body of heater 17 all around.The annular blanking channel that fixed installation is made of interior ring flap 5 and outer shroud flap 7 between the flitch 12 of surrounding to body of heater 17 lower end reducings 16 places of taper tripper 4 formation is so that material falls.And separate space plate 6 outside between the inwall of the outer shroud flap 7 of annular blanking channel middle and upper part and body of heater 17, being installed with, separate space plate 9 in the circular hole that the middle and lower part of annular blanking channel is made of interior ring flap 5, being installed with, separate space plate 9 and outer separate space plate 6 just are divided into I with annular blanking channel like this, II, three sections of III, and together the space segmentation of body of heater 17 is become A with annular blanking channel, B, C, four chambers of D, like this under the effect of kiln tail exhaust blower, discharge kiln tail high-temperature gas by rotary kiln 14 and enter body of heater 17 through kiln tail smoke-box 15, at first enter into the A chamber, because stopping of interior separate space plate 9, with the I section of subcritical speed by the annular bed of material, arrive the B chamber, and pellet carbonic acid is decomposed.Because stopping of outer separate space plate 6, this high-temperature gas passes through the II section annular bed of material to the C chamber with subcritical speed again, and its pellet is carried out carbonate decomposition and kaolin dehydration.The air-flow of C chamber passes through the III section bed of material with subcritical speed again, and material is dried and preheating.Flue gas is after exhanst gas outlet 2 discharges.

When making flue gas pass through the III section bed of material, promptly do not produce fried ball, also not obvious humidification, the temperature of C chamber can be regulated, at this moment can a linear elevating mechanism 1 be installed in the center of barrel 3, at control valve 10 that matches with dividing plate 9 of the lower end of linear elevating mechanism 1 fixed installation.When the C room temperature is low, open control valve 9 through linear elevating mechanism 1, make the part high-temperature gas enter the C chamber, to improve the temperature of C chamber.

In order to guarantee to make the outer pellet of the II section annular bed of material can access decomposition condition, can on the pairing body of heater 17 of the II section annular bed of material, establish three above tertiary air imports 8, and fuel burner 13 is set at tertiary air import 8 places.When the B room temperature is low, can spray into an amount of fuel combustion at tertiary air import 8 places, the temperature of B chamber is controlled within the specific limits.

In order to control the falling speed of material exactly, flitch 12 is a ring plate, at this moment around flitch 12 pairing bodies of heater, be installed with the discharging nozzle 11 that is connected with pneumatic supply through control valve, rely on the pulse compression air of the discharging nozzle 11 of band control valve, the pellet of piling up is fallen kiln exit gas chamber 15 through reducing 16 sprays, enter rotary kiln 14 again.

In order to make taper tripper 4 can become the part of III section, also can pass through thermal current, taper tripper 4 can be made into the Tapered Cup of band air-vent, so that thermal current is by drying material.

In order to prevent that material bed the generation from taking arch between interior ring flap 5 and outer shroud flap 7, influence the whereabouts of the bed of material, the installation between interior ring flap 5 and the outer shroud flap 7 is preferably adopted up and down and is staggered.

Claims

1, the pellet predecomposition furnace, it comprises a cylindrical furnace (17), it is characterized in that: the center in the upper surface of body of heater (17) is provided with a barrel (3), top at barrel (3) body of heater (17) on every side is provided with exhanst gas outlet (2), be fixed with in the body of heater (17) below the barrel (3) a taper tripper 4 is installed, the outward flange of taper tripper (4) is to being installed with the annular blanking channel that interior ring flap (5) and outer shroud flap (7) constitute between body of heater (17) the lower end flitch (12), be installed with separate space plate (6) outside between the inwall of the outer shroud flap (7) of annular blanking channel middle and upper part and body of heater (17), separate space plate (9) constitutes in being fixed with on the center hole that annular blanking channel middle and lower part is surrounded by interior ring flap (5).

2, pellet predecomposition furnace according to claim 1 is characterized in that: in the center of barrel (3) a linear elevating mechanism (1) is installed, control valve (10) that cooperates with interior separate space plate (9) of lower end fixed installation of linear elevating mechanism (1).

3, pellet predecomposition furnace according to claim 1 and 2 is characterized in that: flitch (12) is a ring plate, is installed with the discharging nozzle (11) of band control valve around the pairing body of heater of flitch (12) (17).

4, pellet predecomposition furnace according to claim 1 and 2 is characterized in that: the taper tripper has air-vent on (4).

5, pellet predecomposition furnace according to claim 3 is characterized in that: the taper tripper has air-vent on (4).

6, pellet predecomposition furnace according to claim 1 and 2 is characterized in that: be provided with the tertiary air import (8) that has fuel burner (13) more than three on the annular pairing body of heater of blanking channel II section (17).

7, pellet predecomposition furnace according to claim 3 is characterized in that: be provided with the tertiary air import (8) that has fuel burner (13) more than three on the annular pairing body of heater of blanking channel II section (17).

8, pellet predecomposition furnace according to claim 4 is characterized in that: be provided with the tertiary air import (8) that has fuel burner (13) more than three on the annular pairing body of heater of blanking channel II section (17).

9, pellet predecomposition furnace according to claim 5 is characterized in that: be provided with the tertiary air import (8) that has fuel burner (13) more than three on the annular pairing body of heater of blanking channel II section (17).

10, pellet predecomposition furnace according to claim 5 is characterized in that: be the installation that is staggered up and down between interior ring flap (5) and the outer shroud flap (7).