A kind of heat accumulating type lime rotary kiln
The invention belongs to the production unit technical fields such as chemical industry, metallurgy, building materials, relate to a kind of lime production device, be specifically related to a kind of heat accumulating type lime rotary kiln.
Lime rotary kiln is a kind of equipment of producing lime, with respect to shaft furnace, beam type kiln, sleeve kiln etc., there is feature ， China lime production fields such as the activity of lime that can calcine small particle size Wingdale, fire high (activity degree can reach 350-400ml), high, easy to operate, the easy maximization production of mechanization degree and obtained a large amount of application.According to statistic data in 2010, the lime that rotary kiln is produced accounted for 47.84% of quickened lime (more than activity degree 300ml) production capacity.
But the energy consumption of rotary kiln is large compared with other limestone kiln, its power consumption is 40kWh/t, and hear rate is 5000～5300kJ/kg, and thermo-efficiency is 55～65%.High energy consumption has limited the development of runner ash furnace.Under the overall background of energy-saving and emission-reduction, the energy consumption that reduces rotary kiln seems particularly important.
Summary of the invention
The object of this invention is to provide a kind of lime rotary kiln, by accumulation of heat, warm-up combustion-supporting air in preheating chamber, make full use of the waste heat of lime production, reduce rotary kiln energy consumption and lime production cost, increase economic efficiency.
A kind of heat accumulating type lime rotary kiln of the present invention, comprises kiln hood, cooling room, kiln hood, gas blower, cooling blower, feeding system and exhaust emission system, and kiln hood is provided with burner.Heat accumulating type lime rotary kiln is provided with two kiln bodies and two preheating chambers, and every kiln body is divided into 2 ~ 3 sections.Two kiln bodies are symmetrically arranged respectively or asymmetric arrangement, and one of kiln body is connected with cooling room by kiln hood, and other end is connected with the outlet of preheating chamber by feed compartment respectively.The entrance of preheating chamber is connected with T-valve with opening for feed respectively by Y-tube.The other two-way of T-valve, the airline of leading up to is connected with gas blower, and another road is connected with exhaust emission system.Cooling blower is connected to the bottom of cooling room, and cooling room is provided with discharge port, and discharge port is connected with discharging equipment.Three outlet junctions of T-valve are provided with valve plate, and opening for feed is provided with valve plate.
Kiln body is provided with waste-heat recoverer and induced draft fan, and waste-heat recoverer is tube structure, is positioned at the outside of every section of kiln body, and the kiln body of waste-heat recoverer and rotary kiln is coaxially installed.Described waste-heat recoverer is provided with gas inlet and air vout, and gas inlet is positioned at the both sides of waste-heat recoverer.The outlet of waste-heat recoverer is connected to the entrance of induced draft fan (20) by pipeline, the outlet of induced draft fan is connected to the airline of middle part, fuel preheater (21) or the coal-grinding stoving oven of cooling room (12).The entrance of burner (10) is connected with fuel conduit by fuel preheater.
Rotary kiln is single pressure system or two pressure system.The exhaust emission system of dual pressure system comprises fly-ash separator, induced draft fan and chimney, and the gas blower of the left and right sides is connected with T-valve by airline respectively.The exhaust emission system of single pressure system is provided with fly-ash separator and chimney, and roots blower replaces gas blower, and the outlet of roots blower is connected respectively to the T-valve at preheating chamber top, both sides by airline.
Burner is geseous fuel burner or liquid fuel burner or solid fuel burner.
Rotary kiln is for the calcining of solid materials or the reduction of solid materials.Solid materials is that Wingdale, rhombspar, pellet, iron ore or calcium carbide are produced, the raw material of manufacture of cement.Heat accumulating type lime rotary kiln is Multi-functional standard platform, for various industrial uses.
Rotary kiln has and flows calcining zone and adverse current calcining zone, and integral body is symmetrically arranged, and centre connects with kiln hood.Two preheating chambers alternately carry out heat exchange with flue gas and combustion air.At kiln body head, burner is set, can adopts single-point or multiple spot to arrange burning, limestone material is calcined, simultaneously even kiln temperature field, keeps kiln internal combustion atmosphere suitable.Cooling room sodalime and cooling air countercurrent flow, the warm air after heating mixes with flue gas through fume side kiln body and enters preheating chamber.The material loading of limestone material, the flue gas of discharge and the combustion air entering directly pass through preheating chamber top, and wherein limestone material is as heat storage, by flue gas heating and preheating cooling air.When entering air cooling material, one side preheating chamber adds warm air simultaneously, when the fuel mix of warm air and the ejection of this side burner is burnt, in addition on one side preheating chamber by exhaust gas emission by the waste heat recovery in flue gas to material, the fuel of burner ejection can be superfluous and not enough according to processing requirement, according to the requirement of technique, at kiln hood place, auxiliary burning nozzle can be set, at kiln hood, combustion air passage be set.
At kiln body head, burner is set, can single-point or multiple spot arrange burning, limestone material is calcined, even kiln temperature field, keeps kiln internal combustion atmosphere suitable simultaneously.Cooling room sodalime and cooling air countercurrent flow, the warm air after heating and flue gas are mixed in smoke evacuation side rotary kiln, then enter blowdown system through preheater.The material loading of limestone material, the flue gas of discharge and the combustion air entering directly pass through preheating chamber top, and wherein limestone material is as heat storage, by flue gas heating and preheated air.
Heat accumulating type lime rotary kiln of the present invention, by two preheating chambers in left and right and two rotary kiln bodies are set, utilizes material in preheating chamber to make heat storage, alternately absorbs accumulation of heat and preheated air exothermic process.Material in one side kiln body burner combustion calcining kiln body during calcining, the flue gas of generation to preheating chamber preheating material, carries out accumulation of heat through opposite side kiln body.Opposite side kiln body burning, in preheating chamber, material is emitted heat warm-up combustion-supporting air, and it is combustion-supporting that the air after preheating enters kiln body through the burner of kiln hood.The fume afterheat that rotary kiln produces in calcining is fully used, has reduced lime production energy expenditure and lime production cost.Exhanst gas outlet temperature control is at 100-150 ℃, and lime temperature out is≤100 ℃.Burner is arranged in kiln hood place, makes limestone material first by adverse current preheating, then by also stream calcining, effectively improves the quality of lime.
Accompanying drawing explanation
Fig. 1 is heat accumulating type lime rotary kiln schematic flow sheet of the present invention
Fig. 2 is the schematic flow sheet of another embodiment of the present invention;
Fig. 3 is the schematic flow sheet of third embodiment of the invention;
Fig. 4 is the schematic flow sheet of four embodiment of the invention.
1-flue gas pipeline, 2-feeding system, 3-opening for feed, 4-preheating chamber, 5-feed compartment, 6-valve plate, 7-airline, 8-gas blower, 9-kiln hood, 10-burner, 11-kiln hood, 12-cooling room, 13-cooling blower, 14-discharge port, 15-discharging equipment, 16-kiln body, 17-T-valve, 18-Y-tube, 19-waste-heat recoverer, 20-induced draft fan, 21-fuel preheater, 22-roots blower, 23-gas inlet, 24-auxiliary burning nozzle, 25-combustion air passage, 26-air vout.
Below in conjunction with accompanying drawing, the present invention is described in detail.
Heat accumulating type lime rotary kiln of the present invention as shown in Figure 1, comprises two kiln bodies 16, two preheating chambers 4, kiln hood 11, cooling room 12, burner 10, gas blower 8, kiln hood 9, cooling blower 13, feeding system 2 and exhaust emission systems, is provided with burner 10 in kiln hood.Two kiln bodies are symmetrically arranged, and one of kiln body is connected with cooling room by kiln hood 11, and other end is connected with the outlet of preheating chamber 4 by feed compartment 5 respectively.The entrance of preheating chamber is connected with T-valve 17 with opening for feed 3 respectively by Y-tube 18.The airline 7 of leading up in the other two-way of T-valve is connected with gas blower, and another road is connected with exhaust emission system; Cooling blower is connected to the bottom of cooling room, and cooling room is provided with discharge port 14, and discharge port is connected with discharging equipment 15.Three mouths of T-valve are respectively equipped with valve plate 6, and opening for feed is provided with valve plate.Heat accumulating type lime rotary kiln is two pressure systems, and gas discharge system comprises induced draft fan, fly-ash separator and chimney.The gas blower 8 of the left and right sides is connected with T-valve 17 by airline respectively.Kiln body 16 is provided with waste-heat recoverer 19 and induced draft fan 20.The entrance of burner 10 is connected with fuel conduit by fuel preheater.Kiln hood 11 is provided with auxiliary burning nozzle 24, and kiln hood is provided with combustion air passage 25.
Rotary kiln is whole for being symmetrically arranged, and by kiln hood, is connected.Preheating chamber 4 upper ends are connected with material feeding distribution device, smoke discharging device and combustion air diffuser, and lower end connects feed compartment 5.Kiln body 16 heads connect feed compartment 5, and afterbody connects kiln hood 11.Kiln hood 11 connects two the kiln bodies 16 in left and right, connects cooling room 12 simultaneously.
Limestone material joins the material feeding distribution device at preheating chamber top from feeding system, enter left side preheating chamber 4.Limestone material after being heated in preheating chamber enters left side kiln body 16 through feed compartment 5, and in kiln body, burner carries out multi-point equispaced burning, produces the flue gas of uniform temperature fields, and limestone material is calcined.The lime of firing enters vertical cooling room 12 through kiln hood 11, and waste gas enters right side kiln body 16, completes the calcination process of left side Wingdale preheating and rotary kiln.
The cooling air that cooling blower 13 bloats enters cooling room 12, with the heat exchange of high temperature lime counter current contact, lime is cooled to≤100 ℃ after by discharge port 14 and discharging equipment 15 kiln discharges.Air is heated by kiln hood 11 and mixes with the flue gas after the calcining materials of left side, through right side kiln body 16, enters right side preheating chamber 4.At right side preheating chamber, carry out heat exchange with reverse contact of limestone material of whereabouts, after the flue-gas temperature of leaving preheating chamber is down to 100-150 ℃, by exhaust emission system, enter atmosphere, complete the heat-accumulating process of rotary kiln.Both sides kiln body 16, preheating chamber 4 hocket accumulation of heat and preheating and calcining process, carry out blocked operation by the valve plate action of each pipeline, and automatization is controlled, and determines the interval time of switching according to processing condition.
As shown in Figure 2, kiln body 16 is provided with waste-heat recoverer 19 and induced draft fan 20 to another embodiment of the present invention.Waste-heat recoverer 19 is tube structure, is positioned at the outside of every section of kiln body of rotary kiln, coaxially installs with kiln body.Waste-heat recoverer is provided with gas inlet 23 and air vout 26, gas inlet 23 be positioned at waste-heat recoverer both sides, the outlet of waste-heat recoverer is connected to the entrance of induced draft fan 20 by pipeline, the outlet of induced draft fan is connected to the middle part of cooling room 12.With waste-heat recoverer, reclaim the heat that the external wall of kiln distributes, by the air after waste-heat recoverer preheating, enter cooling room, with the heat of chilled product, continue to add warm air.At cooling room 12, through cooling blower 13 enter cooling air and the preheating that enters through induced draft fan 20 after air converge, together leave cooling room, through kiln body 16 to after preheating chamber 4 preheating materials to exhaust emission system discharge.
As shown in Figure 3, induced draft fan outlet is connected to fuel preheater 21 to the third embodiment of the present invention, and fuel conduit is through fuel preheater to burner 10, and the heat reclaiming with waste-heat recoverer is by fuel preheater 21 pre-heating fuels.
As shown in Figure 4, rotary kiln is single pressure system to the 4th kind of embodiment of the present invention, and in single pressure system, exhaust emission system is provided with fly-ash separator and chimney, and roots blower 22 replaces gas blower air blast.The outlet of roots blower is connected respectively to the T-valve 17 at preheating chamber top, both sides by airline 7, whole equipment alternation, when entering air cooling material, one side preheating chamber adds warm air simultaneously, when the fuel mix of warm air and the ejection of this side burner is burnt, in addition on one side preheating chamber by exhaust gas emission by the waste heat recovery in flue gas to material, because fume side does not have the suction function of induced draft fan, therefore the air-flow in kiln drives by the impellent of roots blower entirely, at equipment, carry out not ventilating before commutation process at every turn, after commutation finishes, ventilate again.