CN2209674Y

CN2209674Y - Rotary calcining kiln for continuous preparing light calcined magnesia with coal as fuel

Info

Publication number: CN2209674Y
Application number: CN94212726U
Authority: CN
Inventors: 白添中
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-05-30
Filing date: 1994-05-30
Publication date: 1995-10-11
Anticipated expiration: 2004-05-30

Abstract

The utility model relates to a rotary calcining kiln for continuous preparing light calcined magnesia with coal as fuel, which is composed of two composite units, wherein, a first composite unit is a horizontal rotary kiln whose main materials are heat-resisting steels, products enter the chamber of the seal components of tail end of the kiln by a discharging hole which is positioned at the end of a barrel body, the gas-solid isolation of the products can be carried out in the chamber, and calcined magnesia is continuously exhausted; a second composite unit is a calcining kiln which is formed around the barrel body, the barrel body is positioned at the middle part of the utility model, fireproofing materials are used as the main materials, and hot flue gases can be made to flow and be heated around the barrel body of the rotary calcining kiln with a certain speed. The utility model is suitable for the continuous calcination of magnesium carbonate whose original materials are white stoning, bittern, etc., the utility model can also be used for the process and the calcination of various other magnesium salts, and the calcined magnesia with good quality can be made.

Description

Rotary calcining kiln for continuous preparing light calcined magnesia with coal as fuel

The utility model belongs to industrial furnace, and being specifically related to a kind of is the magnesian rotary calcining stove of fuel continuously preparing light with the coal.

Rhombspar is that to produce magnesian last chemical reaction units process be the calcining of magnesium basic carbonate (hereinafter to be referred as magnesiumcarbonate) to raw material, present domestic employing be a kind of fixedly stove of building by laying bricks or stones with refractory brick of backwardness, some places are in light-burned stove, this stove is divided into a fairly large number of upright chamber, with manually to the upright indoor magnesiumcarbonate of pouring into, utilize the heat of coal burning, heating refractory brick, indirect heating is found the magnesiumcarbonate in the chamber again, and from the manual material that stirs of charging opening, draw from the bottom discharge osculum with little spades and to get the good magnesium oxide of calcining, the problem of this stove existence is that material calcining is inhomogeneous, thermo-efficiency is very low, calcination time is long, and labour intensity is big, polluted air, unstable product quality, occupation area of equipment is big.

Domestic someone once attempts to carry out heating and calcining with far infrared rays, but does not succeed.

The purpose of this utility model fundamentally solves the existing problem of above-mentioned native stove with regard to being, and a kind of calcination efficiency and mechanize level of improving is provided, and reduces energy consumption, control environmental pollution, the novel coal that reduces production costs calcining stove.

The utility model stove be a kind of be fuel with the coal, the continuous calcining magnesiumcarbonate with revolving structure is produced magnesian stove.This stove is made of two molectrons, and first molectron is to be the Roarykiln of main material with high temperature steel, and second molectron is to be the calcining kiln that the converter middle cylinder is constructed that centers on of main material with refractory materials.

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

Fig. 1 is the utility model Roarykiln structural representation.

Fig. 2 is the utility model calcining kiln structural representation.

Fig. 3 is the A-A sectional view of the utility model calcining kiln.

Fig. 4 is the B-B sectional view of the utility model calcining kiln.

Fig. 5 is that the C of the utility model calcining kiln is to sectional view.

As shown in Figure 1, as first molectron of stove by forestock wheels 1, stove head seal spare 2, wheel be with 3, before the transmission mechanism 4, master wheel 5, burner hearth behind sealing-ring 6, cylindrical shell 7, the burner hearth sealing-ring 8, stove tail sealing member 9, carbonic acid gas vapor pipe 10, discharge hole 11, thermocouple temperature measuring apparatus 12, discharge nozzle 13 and butt wheels 14 form.Forestock wheels 1 and butt wheels 14 are taken turns with 3 by former and later two and are born the load of converter.Stove head seal spare 2 and stove tail sealing member 9 can guarantee that material does not leak outside in the stove because the sealing function of wear ring is arranged.Master wheel 5 is the parts that drive cylindrical shell 7 rotations, and the power of master wheel 5 and rotating speed depend on transmission mechanism 4.Cylindrical shell 7 is formed by the certain thickness extraordinary high temperature steel 1Cr25Ni20 welded steel plate that has of band flight, and its obliquity is adjustable, generally can be controlled in about 1/100, also can transfer to level attitude.The rotating speed of this cylindrical shell 7 is 0.4-5.4 rev/min.The middle cylinder of body of heater 7 is between the preceding envelope wall 16 and back envelope wall 15 of calcining kiln, so that accept the heat of high-temperature flue gas.Sealing-ring 6 and back sealing-ring 8 are to prevent kiln internal combustion coal smoke gas leakage before having on preceding envelope wall 16 and back envelope wall 15 outside cylindrical shells.At the end of cylindrical shell 7, be provided with some discharge holes 11, the size of discharge hole 11 can be regulated, so that the magnesian withdrawal rate of control product.Carbonic acid gas vapor pipe 10 and magnesium oxide discharge nozzle 13 are located at the upper and lower of stove tail sealing member 9 chambers respectively.One thermocouple temperature measuring apparatus 12 is arranged, and the chamber by stove tail sealing member 9 inserts in the end of cylindrical shell 7 from the outside, and temperature is to reach the manually important parameter of control calcining operating mode automatically in the cylindrical shell of thermocouple temperature measuring apparatus 12 detection record.

As Fig. 2-shown in Figure 5, as second molectron of calcining kiln by back envelope wall 15, preceding envelope wall 16, exhanst gas outlet 17, interior wall 18, go up flap 19, common brick exterior wall 20, pressure tap 21, thermometer hole 22, gas inlet 23, fire grate 24, fire hole 25, vertical fire damper 26, flame import 27, lower flap portion 28, horizontal fire damper 29, on roll over orifice plate 30, horizontal baffle 31, roll over orifice plate 32 down and vertical partition plate 33 is formed.

Calcining kiln is the external-heat device that heat is provided for converter cylindrical shell 7 stage casings by burning of coal.

The cylindrical shell 7 of converter pierced greatly from preceding envelope wall 16 and the back center of sealing wall 15 that refractory brick is constructed.Preceding envelope wall 16, back envelope wall 15 and annular interior wall 18 had both formed the main frame structure of calcining kiln, had retrained coal-fired flame and high-temperature flue gas again, made it not to the kiln external diffusion.This calcining kiln has adopted coal-fired fire grate, and upper furnace is provided with horizontal fire damper 29, vertical fire damper 26, and vertical fire damper 26 is provided with flame import 27.Be intervally distributed with folding orifice plate 30, horizontal baffle 31 around the converter cylindrical shell vertically, roll over orifice plate 32, vertical partition plate 33, exhanst gas outlet 17 down, the bottom of calcining kiln links to each other with the kiln seat.Last flap 19, lower flap portion 28, vertical fire damper 26, horizontal fire damper 29, horizontal baffle 31, on roll over orifice plate 30, roll over orifice plate 32, vertical partition plate 33, flame import 27 and exhanst gas outlet 17 down and can make coal-fired flame and flue gas thereof around the operation of cylindrical shell 7 middle parts, to greatest extent to being provided heat by incinerating magnesiumcarbonate.Its vertical baffle 26, horizontal fire damper 29, horizontal baffle 31, vertical partition plate 33, on roll over orifice plate 30, roll over orifice plate 32 down and can give the system transportation, but also in-situ casting, its material is a heat resistance concrete.Fire grate 24 is positioned at the lower position of converter cylindrical shell 7 middle parts near the material outlet direction.Progressively heat up, dewater after this position can make material enter cylindrical shell 7 and reach calcining temperature.Can detect the pressure and temperature in the burner hearth by pressure tap 21, temperature-measuring port 22, fire hole 25 is positioned at fire grate 24 tops, is the passage of lighting bunker coal above the fire grate, and gas inlet 23 is positioned at fire grate 24 belows.

Now the calcining of magnesiumcarbonate is explained as follows in conjunction with Fig. 1:

Magnesiumcarbonate is sent into the termination of converter cylindrical shell 7 through screw feeder, because the drive of master wheel 5 makes body of heater 7 rotations that sal epsom is housed, under the stirring of sal epsom flight in rotary cylinder body 7, by means of body of heater 7 certain gradient and inner certain negative pressure, progressively forward.Front and back support roller group 1,14 and wheel are with 3 can guarantee the body of heater stability of rotation, and material is heated evenly, and burner and stove tail sealing member 2,9 have been avoided the leakage of material.The calcining of sal epsom mainly cylindrical shell 7 middle part high-temperature flue gas around section in finish, temperature measuring equipment 12 is being monitored calcining temperature constantly through thermocouple sheath, and with the outer gas blower interlocking of calcining kiln.

Calcination reaction is:

MgCO ₃·Mg（OH） ₂H ₂O→2MgO＋CO ₂↑＋2H ₂O↑

The magnesium oxide that calcining generates bleeds by discharge hole 11 in the chamber of stove tail sealing member 9, and the total area of discharge hole 11 can make the good magnesium oxide of firm calcining discharge just, and is unlikely to burning.Materials such as carbonic acid gas are drained from discharging adapter 10, and magnesium oxide is then concentrated from discharge nozzle 13 and discharged automatically continuously.

Below in conjunction with Fig. 2 to Fig. 5, be that material heat supply in the converter cylindrical shell 7 is described further with regard to coal-fired calcining kiln:

The coal of at first putting on the reciprocating fire grate 24 is ignited, the air that advances by gas inlet 23 drums provides oxygen for coal, coal is back and forth advanced the reach burning by fire grate, the flame that produces is stopped by the horizontal fire damper 29 of calcining kiln upper right quarter, have to translate into the upper space of converter cylindrical shell 7 through the flame import 27 on the vertical fire damper 26, form high-temperature flue gas, then from the hole of last folding orifice plate 30 left to Fig. 2, promptly opposite direction mobile (thereby avoiding back envelope wall 15 outer gearings destroyed by high temperature) with the calcined material working direction, enter the outer space of body of heater 7 middle cylinders, continuation is to the intravital material heating of tube, owing to be subjected to stopping of horizontal baffle 31, high-temperature flue gas furnace tube one circle that have to rotate enters the cylindrical shell bottom external space, hole through rolling over orifice plate 32 down continues to advance left again, be subjected to again stopping of vertical partition plate 33 this moment, hot flue gas can only upwards turn over into, again after cylindrical shell 7 about circle coolings, discharge from exhanst gas outlet 17, thereby stack gas is heated round the stage casing of cylindrical shell 7 equably.

The general native stove of fixed fire coal of the coal-fired rotary calcining stove of the utility model and Present Domestic is compared, and has the following advantages:

1, the calcining of magnesium sulfate changes the continuous charging calcining into by reinforced calcining intermittently, and calcination time can be shortened to below 2 hours by 5 to 7 hours of fixing stove, has greatly improved work efficiency.

2, new stove floor space reduces closely 50% than fixing stove under identical production scale, has realized mechanized charging and discharging, has alleviated labor strength.

3, because heat transfer type is different with the heat transfer material, this novel stove has improved thermo-efficiency more than one times than existing fixedly stove.The tilting furnace degree can be adjusted about 1/100, also can be adjusted to level attitude, and flue tolerance, coal amount add material quantity and also have adjustability in addition, thereby have guaranteed that the calcining operating mode is good.

4, because material is in the stirring forward travel state in rotary kiln, be heated evenly, there is the thermopair of stove end that material in the stove is carried out automatic temperature monitoring control (temperature and gas blower interlocking) again, drum speed can be adjusted in 0.4-5.4 rev/min of scope, thereby the calcining temperature of controlling sal epsom easily maintains the scope of regulation (850-900 ℃), avoid living burning or burning, improved quality product.

This novel stove can use different types of coal to make fuel, as parts such as increase shower nozzles, can also make fuel with coal gas, Sweet natural gas, coal mine gas, heavy oil.

It is the calcining of the sal epsom that makes of starting raw material that this stove is not only applicable to rhombspar, bittern etc., also can be used for the continuous processing calcining of multiple other magnesium salts, produces quality oxide magnesium.

Claims

1, a kind of is the magnesian rotary calcining stove of fuel continuously preparing light with the coal, it is characterized in that this stove is made of two molectrons, first molectron is to be the Roarykiln of main material with high temperature steel, the barrel tip of Roarykiln is provided with temperature measuring equipment, and the discharge hole of some adjustable orifice areas arranged, converter tail end sealing spare has a chamber, and chamber roof is to be the vapor pipe of principal goods material with the carbonic acid gas, and the bottom is a discharge nozzle; Second molectron is the calcining kiln that the converter middle cylinder is constructed that centers on based on refractory materials, this calcining kiln has adopted coal-fired fire grate, upper furnace is provided with horizontal fire damper and vertical fire damper, vertical fire damper is provided with the flame import, be intervally distributed with vertically around the converter cylindrical shell flap, lower flap portion, on roll over orifice plate, horizontal baffle, roll over orifice plate, vertical partition plate, exhanst gas outlet down, link to each other with the kiln seat bottom the calcining kiln.

2, stove according to claim 1, the rotating speed that it is characterized in that described converter cylindrical shell is 0.4-5.4 rev/min, obliquity can be adjusted about 1/100, also can transfer to level attitude.

3, stove according to claim 1, the material that it is characterized in that described converter cylindrical shell is 1Cr25Ni20.

4, stove according to claim 1, it is characterized in that described calcining kiln horizontal fire damper, vertical fire damper, go up flap, lower flap portion, on roll over orifice plate, roll over orifice plate, horizontal baffle, vertical partition plate down and can give the system transportation, also can in-situ casting, its material is a heat resistance concrete.