A kind of beam-type limekiln
The invention belongs to building materials, chemical machinery technical field, relate to a kind of kiln of calcining materials, be specifically related to a kind of improvement of beam-type limekiln.
With the beam-type limekiln calcined limestone is the new technology that lime is produced.Beam-type limekiln has advantages such as energy consumption is low, the lime product quality is good, throughput is strong, turndown ratio is big, is widely used in the lime production of purposes such as metallurgy, chemical industry.Burning beam is the nucleus equipment of beam-type limekiln, and the beam body of burning beam is provided with burner, fuel conduit and combustion air pipeline.Through fuel conduit and combustion-aid air pipe road direction burner transfer the fuel and combustion air, burner uniform distribution fuel also burns, and burning beam is worked under the high temperature of 1200～1500 ℃ of calcining zones, burns out the beam body easily, influences the LP safety in production.
The applicant's number of patent application is 200320111077.3, and the utility model patent that name is called " interior external heating type limestone kiln " provides the technical scheme and the burning beam refrigerative technical scheme of burning beam-type limekiln.Another part application number of the applicant is 200820078007.5; The utility model patent that name is called " a kind of kiln of lime calcining " has also disclosed burning beam refrigerative technical scheme; This scheme " burns out beam body and the intravital facility of beam for avoiding high temperature, is provided with the cavity of heat-eliminating medium circulation in the beam body of upper and lower layer burning beam and following suction bar ".Above-mentioned patented technology has solved burning beam cooling problem; Avoid burning out facility in beam body and the beam body; Circulation is cooled off but the beam body uses thermal oil, and the thermal oil that comes out from the beam body returns burning beam through heat-condutive oil heat exchanger after by air cooling, and the heat of cooling combustion beam can not be recycled; Cause energy dissipation, increased the lime production cost.
Summary of the invention
For overcoming the deficiency of above-mentioned prior art, the present invention provides a kind of beam-type limekiln, makes full use of the waste heat behind the thermal oil cooling combustion beam, makes Production Flow Chart more reasonable, saves the energy, reduces production costs, and increases economic efficiency.
Beam-type limekiln provided by the invention mainly comprises kiln body, feeder system, firing system, discharge system, air feed system and system.The kiln body comprises opening for feed, preheating zone, calcining zone, cooling zone and discharge port.Said calcining zone is equipped with upper and lower two-layer burning beam, is provided with fuel conduit and air passageways in the beam body, and fuel conduit is connected to burner.Burning beam is provided with the burning beam cooling system, and cooling system comprises cavity, connecting pipeline, thermal oil recycle pump and the thermal oil water cooler between beam body and the outer wall, and the thermal oil water cooler has oil circuit and airline.Combustion air is connected to burning beam combustion air inlet through the thermal oil water cooler; Or gas line is connected to the fuel gas inlet of burning beam through the thermal oil water cooler; Or cooling blower is connected to cooling air inlet on the cooling zone through the thermal oil water cooler, and said connecting pipeline and thermal oil water cooler outer wall are surrounded by thermal insulation layer.
The calcining zone upper strata is provided with 2～6 burning beams 5, and lower floor establishes 1～4 burning beam.The thermal oil outlet of each layer burning beam and thermal oil inlet connect together respectively and are communicated with the thermal oil recycle system.
The top of preheating zone is provided with suction bar, and last suction bar is 1～4.The middle part of cooling zone is provided with down suction bar, and following suction bar is 1～4.Last suction bar is connected with exhaust emission system through flue gas/combustion gas interchanger, or is connected with exhaust emission system with flue gas/combustion gas interchanger through flue gas/air heat exchanger respectively.Exhaust emission system comprises fly-ash separator, induced draft fan and chimney.As selection, combustion air can lead to burning beam combustion air inlet through thermal oil water cooler and flue gas/air heat exchanger successively.
Burning beam is rectangle burning beam or T-shape burning beam, and said burner is located at the both sides or the bottom of burning beam.The fuel conduit of burning beam is box-shaped body or tubular body arranged inside structure, and air passageways is the box-shaped body structure, and fuel conduit passes through from air passageways.
As selection, be provided with 2～40 tubular body arranged inside fuel conduits in the burning beam body, the corresponding burner of every road fuel tube.Burner is the combination of geseous fuel burner, liquid fuel burner, solid fuel burner or above-mentioned burner.
Compared with prior art; Thermal oil water cooler of the present invention and combustion air pipeline or gas line or cooling zone cooling air pipeline are connected; Through burning beam thermal oil cooling liberated heat being reclaimed with combustion air or combustion gas or cooling air heat exchange, saved the energy, make every production 1kg lime energy expenditure reduce to 4300kj by 4800kj; Reduce energy consumption and production cost, improved economic benefit.Flow process of the present invention is reasonable, and production operation is more optimized.
Description of drawings
Fig. 1 is the schematic flow sheet of beam-type limekiln of the present invention;
Fig. 2 is the schematic flow sheet of another program beam-type limekiln of the present invention;
Fig. 3 is the schematic flow sheet of third party's case beam-type limekiln of the present invention.
1-hopper, the last suction bar of 2-, 3-preheating zone, 4-calcining zone, 5-burning beam, 6-cooling zone, the last cooling air intake of 7-, 8-cooling air intake, 9-discharge port, 10-flue gas/combustion gas interchanger, 11-fly-ash separator, 12-induced draft fan, 13-chimney, the outlet of 14-thermal oil, 15-thermal oil inlet, 16-thermal oil recycle pump, 17-thermal oil water cooler, 18-valve, 19-cooling blower, 20-flue gas/air heat exchanger, 21-kiln body.
Below in conjunction with accompanying drawing the present invention is further described.
Beam-type limekiln of the present invention is as shown in Figure 1, mainly comprises kiln body 21, feeder system, firing system, discharge system, air feed system and system.The kiln body comprises opening for feed, preheating zone 3, calcining zone 4, cooling zone 6 and discharge port.The top of preheating zone is provided with two suction bars 2.Calcining zone 4 is equipped with upper and lower two-layer burning beam 5, and the upper strata is provided with 3 burning beams 5, and lower floor establishes 2 burning beams, and burning beam is the T-shape burning beam.Be provided with fuel conduit and air passageways in the beam body, fuel conduit and air passageways are box-shaped body, and fuel conduit passes through in air passageways.Fuel conduit is connected to burner, and burner is the geseous fuel burner, and burner is located at the both sides of burning beam, 10 burners of every side.Be provided with the cavity of thermal oil circulation between beam body and the outer wall, the thermal oil outlet 14 of each layer burning beam connects together respectively with thermal oil inlet 15 and is communicated with the thermal oil recycle system.The thermal oil recycle system comprises connecting pipeline, thermal oil recycle pump 16 and thermal oil water cooler 17, and the thermal oil water cooler has oil circuit and airline.Gas blower leads to burning beam combustion air inlet through the air of thermal oil water cooler, and gas line is connected to the fuel gas inlet of burning beam through flue gas/combustion gas interchanger.Connecting pipeline and thermal oil water cooler outer wall are surrounded by thermal insulation layer.Cooling blower 19 is connected to cooling zone cooling air intake 8.Last suction bar is connected to exhaust emission system through flue gas/combustion gas interchanger 10 and connects, and exhaust emission system comprises fly-ash separator 11, induced draft fan 12 and chimney 13.
The process of beam-type limekiln calcining materials does, limestone material is delivered to hopper 2 by feed machinery, drops down onto preheating zone 3 by hopper through bell, by the high-temperature flue gas that rises from calcining zone Wingdale carried out preheating, and the material after the preheating goes downwards to calcining zone 4.Burn by the combustion gas and the combustion air mixing of the ejection of two row's burning beams, 5 burners at calcining zone, calcined limestone, the lime after the calcining goes downwards to cooling zone 6.At cooling zone, cooling air is by cooling blower 19 air blast, gets into cooling zones through cooling air intake 8 and from bottom to top lime cooled off, and cooled lime product is through discharge port 9 kiln discharges, through discharging equipment to the product storehouse.Thermal oil is emitted heat warm-up combustion-supporting air through thermal oil recycle pump 16 to thermal oil water cooler 17, thermal oil water cooler from burning beam thermal oil outlet 14; Thermal oil after the cooling circulates through the cavity that burning beam thermal oil inlet 15 gets in the burning beam in this way.Extract flue gas out from last suction bar 2 and pass to combustion gas to heat after discharge to exhaust emission system through flue gas/combustion gas interchanger.
Another embodiment of the present invention such as Fig. 2 are said, and the cooling zone of said beam-type limekiln is provided with two cooling air intakes, i.e. cooling air gas inlet 8 and last cooling air intake 7.Cooling blower 19 is divided into two-way, and one the road is connected to cooling air intake 8, and another path thermal oil water cooler is connected to cooling air intake 7.Connecting pipeline is provided with valve 18, is used to regulate the air quantity that gets into the thermal oil water cooler.2 outlets of last suction bar are divided into two-way, and one the tunnel is connected to exhaust emission system through flue gas/combustion gas interchanger 10, and one the tunnel is connected to exhaust emission system through flue gas/air heat exchanger.This embodiment is brought heat in the kiln body into through cooling air at the bottom of the kiln with thermal oil and the cooling air heat exchange that gets into cooling zone, and gas to preheating zone preheating limestone material, reclaims the heat that thermal oil is taken out of with this kind mode behind calcining zone.