CN2304880Y

CN2304880Y - Vertical drying furnace with fixed beds

Info

Publication number: CN2304880Y
Application number: CN 97207702
Authority: CN
Inventors: 万维义
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-04
Filing date: 1997-03-04
Publication date: 1999-01-20
Anticipated expiration: 2007-03-04

Abstract

The utility model relates to a vertical drying furnace with fixed beds mainly suitable for cement industry, comprising a drying chamber, a combustion chamber, a storage chamber and a fan. An air chamber blast deflector is arranged in the drying chamber. The fan pipeline is respectively communicated with the combustion chamber and the air chamber blast deflector. The utility model adopts a negative-pressure combustion mode to add coal and remove slag without shutting down, overcoming the defects of the fan during frequent opening and closing. Without moving elements, the utility model has the advantages of simpler structure, convenient operation, convenient maintenance, small volume, high yield, high thermal efficiency, little dust pollution, etc.

Description

The fixed bed tower stove

The utility model relates to the fixed bed tower stove of a kind of drying plant, particularly cement industry, casting industry, mainly is applicable to the drying to clay, coal, iron ore, sulfate slag, blast-furnace cinder, flyash and molding sand equigranular material.

The existing drying plant kind of cement industry is more, as rotary drying machine, fluidised form dryer, boiled bed dryer, gravity drying machine, vertical drying tower and multi-layer discs formula drying tower etc., all adopts the moving bed drying technology.Chinese patent discloses a kind of material SMIS stove, speed governing gravity flow tower drier for No. 94222945.2.A spout that connects with elevator is arranged at its top, and the middle part is array be superimposed with each other material spreading cone and sliding material basin, and the bottom is artificial coal-fired core stove, and the bottom is discharging part and belt conveyor.Be provided with machine driving material device in its stove, it is worked under the hot condition of many dust, easy break-down, inconvenience maintenance.Its air blast belonged to the positive-pressure type burning before the combustion chamber, the coal scarfing cinder must be shut down, and frequent opening and closing coal mouth, cinder notch in the operating process, blower fan stop when also opening correspondingly the time, have quite a few drawbacks.And the thermal efficiency is not high, and exhaust gas and dust content is big, and it is stable that moving bed is difficult for keeping.

The purpose of this utility model is to provide movement-less part in a kind of stove, and the fixed bed tower stove that thermal efficiency height, the suction type that dust pollution is little burn is to overcome the deficiencies in the prior art part.

Technical scheme by this purpose design is: a kind of fixed bed tower stove comprises the tubular drying chamber on top, the combustion chamber at middle part, storage compartment and the blower fan and the pipeline thereof of bottom.Its design feature is to be provided with the air chamber guiding device of being made up of upper strata material supporting rack and lower floor tubulose air chamber with holes in the drying chamber; Fan pipeline communicates with top of combustion chamber pipeline and air chamber guiding device inlet tube respectively.The fixed bed drying technology that its adopts material thermal current is penetrated pile up with certain thickness to make it to dry, its principle is as follows: the thermal current with certain pressure, under fan action, enter air chamber guiding device in the drying chamber from stove external air inlet pipe, from portalling, passes through in the air-flow of air chamber guiding device again, penetrate whole material bedly, heat, evaporate and take away moisture content in the material.Material near the air chamber guiding device is at first dried, and is blown by air-flow to drop in the storage compartment.Dry material constantly falls and wet stock constantly adds, and makes the material fixed bed that is remaining a suitable thickness in the drying chamber, forms preheating, evaporation, three levels of oven dry from top to bottom, realizes heat exchange fully.

The utility model has following advantage compared to existing technology:

1, adopt the negative-pressure firing mode, blower fan is located at after the combustion chamber, and the coal slagging-off need not be shut down, many drawbacks of stopping when opening when having avoided blower fan, and uncovered operation is convenient to the operator and is observed the working of a furnace and the regulation and control working of a furnace.

2, certain thickness material forms fixed bed on material supporting rack, can adsorb and filter the dust in the thermal current, reduces the waste gas dustiness.

3, because of movement-less part in the stove, so structure is simpler, fault-free in the lifetime, operation, easy to maintenance.And volume is little, output is high, the thermal efficiency is high.

Embodiment is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is a combustion chamber embedding structure schematic diagram.

Fig. 2 is a hot-blast stove external structure schematic diagram.

Fig. 3 is an air chamber castor net formula guiding device structural representation.

Fig. 4 is that A among Fig. 3 is to partial view.

Fig. 5 is looped pipeline 12 cross section enlarged drawings among Fig. 3.

Fig. 6 is the board-like guiding device structural representation of air chamber taper.

Fig. 7 is that B among Fig. 6 is to partial view.

Fig. 8 is an air chamber duct type guiding device structural representation.

Referring to Fig. 1, Fig. 6, Fig. 7, this drying oven is made up of the tubular drying chamber 1 on top, the combustion chamber 2 at middle part and the storage compartment 3 of bottom.The intrinsic tapered annular guide plate 13 in upper strata in the drying chamber, a circular cone is protruded in central authorities, and some air-flows that gather on it portal 18.The intrinsic air chamber looped pipeline 14 of lower floor, its cross sectional shape is: top is the triangle conical surface, and material is looked and different in conical surface inclination angle, and some air-flows that gather on it portal 18; The bottom is the inverted triangle conical surface, and vertex of a cone open-ended leaves and is not more than the portal discontinuity slit in aperture of air-flow.The air-flow aperture of portalling is not more than the medium particle diameter of material.Material bed above the 14 common supportings of tapered annular guide plate 13 and air chamber looped pipeline.Blower fan 8 and blast pipe 6 link with air chamber looped pipeline 14, and exhaust column 5 links with combustion chamber 2 top ducts.Air draft pipe is provided with control valve 7.Material is drawn off by level-sensing device control electromagnetic vibration machine 4.

Fig. 2 is the combustion chamber outlet structure.Replace the stove inner combustion chamber with commercially available independent hot-blast stove 10, the combustion chamber is located at side outside the body of heater, and establishes distributor box 9, so that to a plurality of drying chamber air feeds.Other structure no change.

Fig. 3 is an air chamber castor net formula flow-guiding structure.The castor net formula 11 of upper strata material supporting rack for making, square hole or bar hole of shaped steel and round steel all can, the aperture is greater than the aniseed footpath of material; Lower floor's tubulose air chamber is circular ring-type pipeline gas chamber 12, and the bottom is established some air-flows and portalled 18.Material supporting rack also can be the taper guide-plate type 13 that steel plate is made, and air-flow is set on it portals 18, as previously mentioned; Also can be pipelines formula 15, as shown in Figure 8.

Fig. 8 is a pipelines formula flow-guiding structure, is made the ring tube of four different-diameters by the steel pipe of two kinds of diameters and forms.Inside and outside two endless tubes of minor-diameter steel-tube are the upper strata accessory air-space, and inside and outside two endless tubes of large diameter steel pipe are main gas tank of lower floor.Between the inside and outside endless tube of main gas tank, all with steel pipe 17 connections, and make four endless tubes and two layers of air cells that appropriate gap respectively be arranged between the inside and outside endless tube of major and minor air chamber, material bed with above the common supporting.Each endless tube bottom is provided with some air-flows and portals.

Above-mentioned three kinds of air chamber flow-guiding structures, air chamber air inlet quantity is chosen 1-4 according to type of furnace size.The looped pipeline cross section also can be ellipse, taper type, square or rhombus.Air-flow portals and is generally φ 3-10mm.This product is made by steel.

Claims

1, a kind of granular material that utilizes thermal current to penetrate accumulation fixed bed tower stove of making it to dry, comprise the tubular drying chamber (1) on top, the combustion chamber (2) at middle part, storage compartment (3) and the blower fan (8) and the pipeline thereof of bottom, it is characterized in that being provided with in the drying chamber air chamber guiding device of forming by upper strata material supporting rack and lower floor tubulose air chamber with holes; The exhaust column of blower fan (5), blast pipe (6) link with the inlet tube of top of combustion chamber pipeline and air chamber guiding device respectively.

2, tower stove as claimed in claim 1 is characterized in that material supporting rack is should be greater than the maximum particle diameter of material with castor net formula (11), its hole of shaped steel and round steel making; Or the taper guide-plate type of making for steel plate (13), air-flow portal (18) is set on it; Or be pipelines formula (15), air-flow is set equally portals.

3, tower stove as claimed in claim 1 is characterized in that the tubulose air chamber is looped pipeline (12/14/16), and its underpart is provided with air-flow portal (18); Pipeline section is circle, ellipse, taper type, square or rhombus.

4, tower stove as claimed in claim 1 is characterized in that the combustion chamber can be located at side outside the body of heater, so that general with commercially available hot-blast stove (10).