CN1199852A - Bell type rotating electric furnace - Google Patents

Abstract

The electric furnace includes stock, bell jar covering the stock, annular hearth, which is constituted by annular external and internal vertical walls and has electric heating wire so arranged as to form proper low, medium and high temperature zones inside the hearth, and heat-insulated carrying tray at the bottom of the hearth and rotated by one motor. The coal sample holding container is pushed onto the tray continuously and passed through the low, medium and high temperature zones to complete test. The electric furnace is especially suitable for use in fast ash content test in the coal washing process.

Description

Bell type rotating electric furnace

The invention belongs to industrial furnace, in particular for coal coal analysis chemical examination electric furnace.

In measuring coal during content of ashes, load weighted sample coal be contained and be put into electric furnace into cupel and slowly heat up, through to coal preheating, ashing, calcination process, surplus materials is ash content in the cupel, and Weighing can produce coal contains ash amount.Doing this assay at present all is to carry out in cabinet-type electric furnace, the burner hearth that this stove is mainly surrounded by shell, thermal insulation fire-resistant brick and heating wire of heat transfer etc. are formed, when being put into behind the burner hearth energising heating, the cupel that fills the sample coal closes fire door, good heat insulation, and temperature rise is fast.But its weak point is: when finishing a stove sample coal and make second stove again, burner hearth just can be put into the sample coal below being as cold as the preheat temperature of sample coal, otherwise, the too high sample coal that easily makes of temperature is because of sharply heating detonation, cause test inaccurate, need the time because of cooled hearth like this, doing the cycle of a stove coal sample wanted about 4.5 hours, so can not draw test result continuously fast, for example in the coal washing process, need grasp the coal washing quality at any time, the content of ashes of adjusting process control in time index instructs produces, and crosses the low requirement that can't adapt to instant sample examination with cabinet-type electric furnace because of work efficiency; On the other hand, the furnace temperature of doing experiment is the highest will to rise to degree more than 800, and when making the mat woven of fine bamboo strips two stoves, the preheat temperature that burner hearth will be as cold as coal below 100 ℃ just can be put into and close fire door behind the sample coal and heat up, so not only the stand-by period long, and heat is lost in vain causes energy waste.

The purpose of this invention is to provide and a kind ofly can do the experiment of from the sample coal, obtaining ash content continuously fast, assay heating electric furnace that again can energy savings.

For achieving the above object, the present invention is achieved like this: the stove seat with vertical circular hole is installed on a fixed support, in stove seat hole, the bottom filled thermal insulation materials, the middle part horizontal has the round tray that can rotate in the hole, the pallet upper flat is equipped with circular pallet, accompanies heat-barrier material between two dishes, and bolt is fixed together two dishes; Its axle of motor that is fixed on the support is connected with pallet; Outer upright wall with the bell-jar of circular inside and outside wall is buckled in stove seat hole wall top downwards hermetically, looping burner hearth between the interior outer upright wall, the outer upright wall side elevation has an opening, studs with the fire door of fetching and delivering sample on the mouth, and wall end opening leaves and covers on core above the pallet with gap in it; On the wall of bell-jar, have a plurality of vertical open-works, the heating wire that communicates with power supply is housed in the hole, the arrangement density in its hole is according to entering the temperature requirement of next circulation after the preheating of sample coal, ashing, the calcination, from fire door one side, the opposite side along circumference to fire door distributes; Leave cross-drilled hole on the outer upright wall of bell-jar, thermocouple stretches into burner hearth from cross-drilled hole; On support,, between shell and body of heater, be filled with the insulation filler by the body of heater button shell within it that will form by stove seat and bell-jar.

In order to reduce the conduction of the heat between each heating-up temperature district in the annular furnace, between the inside and outside wall of bell-jar, be provided with the top and link to each other the vertical dividing plate that two ends link to each other with inside and outside two walls with the cover top.

Because the pallet of above-mentioned electric furnace can rotate in burner hearth, with good grounds different temperatures district requires to arrange the heating wire that density does not wait on the wall of bell-jar, the cupel of containing coal sample can be admitted to the annular furnace from fire door continuously, the sample coal enters preheating, ashing, each humidity province of calcination successively on the pallet of rotation, do not need blowing out can finish the chemical examination work of a plurality of sample coals continuously, the work efficiency height, also can satisfy the regulation and control coal cleaning process guidance production in time of chemical examination immediately in the coal cleaning process process, improve the coal washing quality; Because of not needing blowing out to be cooled to preheat temperature sample presentation again, greatly reduce the invalid loss of heat simultaneously, saved the energy.According to measuring and calculating, under equal conditions make the chemical examination of coal sample of this stove, per tour can be done 100 coal samples, and work efficiency is 5-6 a times of cabinet-type electric furnace, and simultaneously average each sample coal is than cabinet-type electric furnace economize on electricity 0.86 degree.

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is the cutaway view of bell type rotating electric furnace;

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

Among Fig. 1, be installed with flange plate type stove seat 3 at the top of support 2, it has in the vertical circular inner hole, fill with insulation material 4 bottom, one horizontal is arranged at filler top, the circular metal pallet 5 that can in the hole, rotate, resistant to elevated temperatures pallet 9 be flat on the hole top and and pallet 5 between separate with heat-barrier material 8, the centre bore of bolt 10 by pallet 9 is screwed into the center screw of pallet 5 and is fixed, the cover that is welded in pallet 5 centers passes insulation material 4 and fixes with pin or key with the axle that is fixed on the motor 1 on the support, this motor can be a stepless speed-regulating motor, also can be connected with pallet 5 by behind the mechanical speed change, by gear exchange speed change with common electric machine; Use in the time of all can making the disk finished product that is suitable for installing for assembling for mounting or dismounting convenient transportation, insulation material 4 and heat-barrier material 8; Outer upright wall 18 end openings that have the bell-jar made from exotic material 15 of outer upright wall 18 and interior wall 19 are buckled on the top of stove seat 3 hermetically, 19 centres that just in time cover on pallet 9 of interior wall, relatively turnable gap is left in the centre, constitute the annular furnace 20 that can hold the coal sample cupel between two walls, one opening is arranged on the side elevation of outer wall 18, opening part studs with the fire door 7 of resistant to elevated temperatures transverse opening, for ease of the placement of sample, the lower wall surface of fire door 7 also level platform 6 is housed; In bell-jar 15, outer upright wall 19, on 18, vertically leave a plurality of open-works 21, heating wire 14 is housed in the hole and walks continuous (referring to Fig. 2) up and down, lift one's head and guide the outer binding post 16 of cover into through the crossed beam trunking 22 at bell-jar 15 tops, open-work 21 can all stay on inside and outside wall, also can only stay on the outer upright wall 18, can also in burner hearth, add combustion chamber in addition and wear heating wire, the arrangement in hole 21 is with after putting on heating wire 14 energisings, from fire door 7 one side entrances, can reach the preheating of sample coal along annular furnace 20 circumference, ashing, entering the opposite side preheat temperature after the calcination again requires to be advisable.Because when this bell type rotating electric furnace is heated, the fire door 7 of feeding sample is not closed, so the preheat temperature of coal can be controlled in about 300 ℃ not can detonation, be when 815 ℃ of calcination temperatures are got back to preheating 300 ℃ of the temperature that reaches in annular furnace 20 heating sample coal, both sides at fire door 7 are just installed heating wire 14 along annular beyond about to the left and right 60 degree angles, if change clockwise from fire door 7, walking up and down gradually of heating wire 14 encrypted, to the zone of crossing the about 30 degree angles of the center line relative with fire door 7, it is the closeest, then decrescence rare thoroughly again when temperature reaches 815 ℃ of the calcination temperatures of coal excessively to preheat temperature.For making each temperature range reduce the conduction of heat, between the interior outer upright wall 19,18 of bell-jar 15, be provided with vertical dividing plate 13, its two ends link to each other with interior outer upright wall, the top links to each other with the top of bell-jar 15, and the height of dividing plate 13 bumps less than being as the criterion when rotating with the cupel of the coal-containing placed on the pallet 9.Have cross-drilled hole on the outer upright wall 18 of bell-jar 15, thermocouple 17 from then on hole inserts burner hearth 20.Shell 11 is buckled in the whole covers of body of heater of bell-jar 15 and stove seat 3 compositions on the support 2, and fire door 7 exposes shell 11 sides, is filled with insulation filler 12 between shell 11 and body of heater.

During use, adjust the rotating speed of motor 1, heating wire 14 is connected power supply, when the preheating zone at fire door 7 places 23 temperature during 300 ℃ of left and right sides, the cupel of containing coal sample is put into the inlet of burner hearth 20, starter motor 1, pallet 9 slowly rotates, the sample coal is also put into the inlet of burner hearth 20 successively, enter about about 600 ℃ ashing district 24 through the preheating zone, be rotated further the calcination district 25 that enters again more than 700 ℃, when the maximum temperature that reaches 815 ℃, finish calcination, the experiment of a sample coal is finished and is entered low-temperature space and takes out cupel from fire door, and all the other sample coals circulate successively and carry out successively, when finding that content of ashes is nonconforming behind the sample examination in the coal cleaning process process, at any time adjusting process sampling chemical examination again, qualified until product quality.

Claims (3)

1, a kind of bell type rotating electric furnace comprises the heating wire (14) of shell (11), burner hearth (20), heat transfer usefulness, the thermocouple (17) that inserts burner hearth, the support (2) below the electric furnace, it is characterized in that: the end face of support (2) is fixed with stove seat (3), therein in the circular vertical core of the heart, fill with insulation material (4) bottom, the middle part horizontal has the round tray (5) that can rotate in the hole, horizontal has circular pallet (9) above the pallet (5), accompany heat-barrier material (8) between two dishes, bolt (10) is fixed together two dishes; The axle that is fixed on the motor (1) on the support (2) links to each other with pallet (5), outer upright wall (18) with the bell-jar (15) of circular inside and outside wall (19), (18) is buckled in stove seat (3) hole wall top downwards hermetically, looping burner hearth (20) between two walls, interior wall (19) end opening leaves and covers on upward core of pallet (9) with gap, outer upright wall (18) side elevation has an opening, studs with the fire door (7) of fetching and delivering the sample coal on the mouth; On the wall of bell-jar (15), have a plurality of vertical open-works (21), the heating wire (14) that communicates with power supply is housed in the hole (21), the arrangement in hole (21) is according to entering the temperature requirement of next circulation of preheating again after the preheating of sample coal, ashing, the calcination, from a side of fire door (7), (7) opposite side distributes along circumference to fire door; Shell (11) is buckled on the support (2), in the body of heater that stove seat (3) and bell-jar (15) are formed is buckled in, is filled with insulation filler (12) between shell (11) and the body of heater.

2, bell type rotating electric furnace as claimed in claim 1 is characterized in that: have top and cover to push up the dividing plate (13) of the vertical retaining continuous, that two ends are connected with interior wall (19), outer upright wall (18) in each heating-up temperature interval in the bell-jar (15).

3, bell type rotating electric furnace as claimed in claim 1 or 2 is characterized in that: the insulation material (4) and the heat-barrier material (8) that are positioned at stove seat (3) are the shaping disc that is adapted to the electric furnace assembling.

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