CN2551950Y - Preheating decomposing device for outside of kiln - Google Patents

Abstract

The utility model relates to a cement burning apparatus which belongs to cement manufacture machines and comprises a first stage cyclone cylinder, a two stage cyclone cylinder, a three stage cyclone cylinder, ascending and descending preheating pipes with a gooseneck type structure for connection, a baiting pipe, a decomposing furnace, etc. The utility model is characterized in that four mixing chambers are connected between the cyclone cylinder and the decomposing furnace. The tapered bottom of every mixing chamber is provided with the baiting pipe which makes bigger particle materials reflux, and the height diameter ratio of the decomposing furnace is 4 to 4.5. The middle part of the decomposing furnace is provided with a reducing opening and the lower end of the decomposing furnace is provided with a priming chamber. The utility model is suitable for new assembly lines and can also be used for reforming the prior vertical kilns and kiln rooms. The utility model has obvious preheating effect, enhances the burning rate of the coal powders sent to the kiln and the decomposing rate of the raw material and has obvious effect of reducing energy consumption and investment.

Description

The outer pre-pyrolysis device of novel kiln

The utility model belongs to manufacture of cement machinery, relates to cement burning plant or rather.

Since the 1980s, novel dry-process rotary kiln has replaced other technology and equipment that falls behind gradually both at home and abroad, it generally mostly is the Pyatyi preheater and adds the pre-pyrolysis device of dore furnace composition raw material, the resolution ratio that raw material are gone into before the kiln can reach about 90%, for calcining the high-quality grog has created good condition at a high speed.But the investment of this method is big, power consumption is high, the steel consumption is many, to having relatively high expectations of ature of coal and raw material etc., especially for general shaft kiln kiln room, because of the frame structure that it is highly high, progression is not suitable for shaft kiln more is difficult to be applied in the transformation of shaft kiln.Chinese patent CN2336305Y three grades of cyclone preheaters of dore furnace " band " provides a kind of cyclone preheater of transforming the band dore furnace of usefulness on the motionless basis of shaft preheater frame structure, have raw material resolution ratio 85% preferably, but to the do not circulate function of preheating of the raw material of larger particles.

The purpose of this utility model be to provide a kind of pre-heat effect obviously, make the outer pre-pyrolysis device of the novel kiln that significantly improves, cuts down the consumption of energy significantly and invest into kiln coal dust burnout rate and raw material resolution ratio, it both had been applicable to new production line, can utilize existing shaft kiln and kiln housing reform to make again.

The technical solution of the utility model is achieved in that the outer pre-pyrolysis device of novel kiln comprises one-level, secondary and three grades of whirlwind tubes, on the gooseneck type structure of connection usefulness, descending preheating pipe and tremie pipe, dore furnace etc., it is characterized in that: between one-level whirlwind tube and the secondary whirlwind tube, between secondary whirlwind tube and the three grades of whirlwind tubes, between dore furnace and the three grades of whirlwind tubes respectively by on the gooseneck type structure, down pipe is connected with first, second, the stove mixing chamber is connected with the tremie pipe of secondary whirlwind tube between secondary whirlwind tube and the dore furnace, the blast pipe of kiln tail smoke-box, the 3rd mixing chamber and left road tremie pipe; One-level whirlwind tube and first, second, stove are connected with corresponding uplink and downlink preheating pipe respectively with the tremie pipe outlet at the mixing chamber awl end, and the right wing tremie pipe outlet at the 3rd mixing chamber awl end is connected with the blast pipe of kiln tail smoke-box; The dore furnace ratio of height to diameter is 4.5, and the middle part has reducing, and the lower end is provided with igniting chamber.

The utlity model has following beneficial effect:

1, the whirlwind tube drops to three grades by Pyatyi, can make resistance reduce about 2KPa, and make the preheater pylon descend more than 20 meter, and heat resisting steel consumption saves 50%, and power consumption saves 30%, can make the equipment investment of this link reduce more than 50%.2, adopt the upper and lower line pipe of gooseneck type structure and mixing chamber that material, air-flow mixing number of times are increased by three times in the whole warm, give full play to the function of pipeline high efficient heat exchanging, prolonged residence time of material, and each mixing chamber awl end, all have tremie pipe, can make the larger particles material that is difficult for preheating return preheating pipe, the circulation heating.3, the igniting chamber that is provided with of dore furnace lower end is to utilize pure high temperature tertiary air that coal is lighted, because its volume is less, room temperature is very high, in being particularly conducive to, the igniting of low ature of coal even colm; The reducing that the middle part is provided with can make the spray of raw material secondary outstanding, all the gasification material; Ratio of height to diameter is bigger, can prolong material at residing time in furnace.4, the dore furnace outlet adds the upper and lower line pipe and the stove mixing chamber of gooseneck type structure, both the raw material time of staying can be prolonged further, can carry out circulating combustion and decomposition with the flap valve at the mixing chamber awl end to the material of larger particles by stove again, make the coal dust burnout rate reach 100% substantially, the raw material resolution ratio can reach 90-95%.5, three grades of whirlwind tubes of the present utility model can reach the effect of five-stage whirlwind tube, extremely be fit to the existing shaft kiln transformation of China, shaft kiln kiln room and infrastructure can be born improved loading fully, add suitable rotary kiln and strength homogenizing storehouse etc., can make the grog daily output reach 500 tons, clinker quality reaches 60MPa.

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

Accompanying drawing is a structural representation of the present utility model.

Drawing explanation: 1,3,4 is respectively the down pipe of first mixing chamber 2, tremie pipe and ascending tube, 5,22,23 is respectively the down pipe of second mixing chamber 6, ascending tube and tremie pipe, the 7th, the material feeding pipe, 10,11,25 is respectively the tremie pipe of stove with mixing chamber 8, ascending tube and down pipe, the 12nd, the tremie pipe of secondary whirlwind tube 9,14,15 is respectively the left road tremie pipe of the 3rd mixing chamber 13, the right wing tremie pipe, the 16th, the blast pipe of kiln tail smoke-box 17, the 18th, tertiary-air pipe, the 19th, rotary kiln, the 20th, exhaust duct, the 24th, the tremie pipe of one- level whirlwind tube 21,29 is tremie pipes of three grades of whirlwind tubes 26,27,28,30,31, the 32nd, the afterburner of dore furnace, reducing, main combustion chamber, igniting chamber and coal powder injection pipe.

Among the figure, raw material are by ascending tube 4 feedings of feeding pipe 7 from first mixing chamber 2, along with entering first mixing chamber 2 after the preliminary heating of rising thermal current, small particles material enters in the one-level whirlwind tube 21 by down pipe 1 and carries out gas solid separation, and the larger particles material is got back to 9 preheatings again of secondary whirlwind tube from the down pipe 5 of tremie pipe 3 to second mixing chambers 6 at the 2 awl ends of first mixing chamber.The raw material that enter one-level whirlwind tube 21 are by tremie pipe 24, ascending tube 22 to second mixing chambers 6 of second mixing chamber 6, the larger particles material refluxes from the tremie pipe 23 at the 6 awl ends of second mixing chamber equally, preheating, small particles material enters in the secondary whirlwind tube 9 by the down pipe 5 of second mixing chamber 6, through the blast pipe 16 of tremie pipe 12 to kiln tail smoke-box 17, delivered to the 3rd mixing chamber 13 after the thermal current heating, its awl end, be provided with the tremie pipe of bifurcated, the flow direction by flap valve control material, most of raw material can directly be delivered to the main combustion chamber 30 of dore furnace by left road tremie pipe 14, the part raw material can be got back to blast pipe 16 by right wing tremie pipe 15, the circulation heating, and the temperature of control blast pipe 16, prevent blast pipe 16 overheated skinning, block.

Stove sprays into the igniting chamber 31 of dore furnace lower end by 2-3 coal powder injection pipe 32 with coal dust, the pure air ignition that utilizes tertiary-air pipe 18 to send here is easy, reducing sprays into main combustion chamber 30 under stove, with raw material spurt, mixed heat transfer in the vortex, it is outstanding that reducing 28 through the middle part makes the spray of material generation secondary again, enter afterburner 27 combustion decomposition, the gooseneck type ascending tube 11 that arrives dore furnace top further burns, heat exchange, enter stove mixing chamber 8 then, by 25 to three grades of whirlwind tubes 26 of down pipe, tremie pipe 10 can make the larger particles material get back to ascending tube 11 circulations again.

Enter the material of three grades of whirlwind tubes 26 because repeatedly mix, dispersion, heat convection, resolution ratio can reach 90-95%, calcines to rotary kiln 19 by tremie pipe 29.The waste gas that whole pre-pyrolysis device produces is discharged from by the exhaust duct 20 that is positioned at one-level whirlwind tube 21 tops at last.

Claims (1)

1, the outer pre-pyrolysis device of a kind of novel kiln, comprise one-level (21), secondary (9) and three grades of whirlwind tubes (26), on the gooseneck type structure of connection usefulness, descending preheating pipe and tremie pipe, dore furnace etc., it is characterized in that: between one-level whirlwind tube (21) and the secondary whirlwind tube (9), between secondary whirlwind tube (9) and the three grades of whirlwind tubes (26), between dore furnace and the three grades of whirlwind tubes (26) respectively by the gooseneck type structure on, down pipe is connected with first (2), second (6), stove is connected with the tremie pipe (12) of secondary whirlwind tube (9) with mixing chamber (8) between secondary whirlwind tube (9) and the dore furnace, blast pipe (16) the 3rd mixing chamber (13) of kiln tail smoke-box (17) and left road tremie pipe (14); First (2), stove is connected with down pipe (5), ascending tube (11) respectively with mixing chamber (8) the awl tremie pipe (3) at the end, (10) outlet, one-level whirlwind tube (21) all is connected with ascending tube (22) with second mixing chamber (6) the awl tremie pipe (24) at the end, (23) outlet, and right wing tremie pipe (15) outlet at the 3rd mixing chamber (13) the awl end is connected with the blast pipe (16) of kiln tail smoke-box (17); The dore furnace ratio of height to diameter is 4-4.5, and the middle part has reducing (28), and the lower end is provided with igniting chamber (31).

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