CN2101198U

CN2101198U - Radiation-convection concentric high-temp. hot ali furnace

Info

Publication number: CN2101198U
Application number: CN 91209514
Authority: CN
Inventors: 董维义
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-06-10
Filing date: 1991-06-10
Publication date: 1992-04-08

Abstract

The utility model relates to a radiation-convection concentric high-temperature hot air furnace, which belongs to the field of horizontal hot air furnaces, comprising a combustion device which is composed of a coal hopper, an inclined reciprocating grate and a furnace cavity, a heat exchange device and a cold flue gas return duct. The utility model is characterized in that the inner and the outer cylinders of the heat exchanger are concentric cylinders, the annular zone between the cylinders are provided with convection flue tube bundle, and a sleeve barrel is arranged near the inner cylinder. A vertical air channel can form between the sleeve barrel and the inner cylinder, a plurality of plywood at the flue gas tube bundle position form a horizontal air channel, the flue tube bundle is arranged on the upper and the lower plates, and the upper tube plate is provided with an expanded junction for compensating the non-uniform heat distorting. The utility model has high thermal efficiency, small inner stress caused by deformation and long service life.

Description

Radiation-convection concentric high-temp. hot ali furnace

The utility model is a kind of radiation---convection current concentric type high temperature hot-blast furnace, be applicable to less than 500,000 kilocalories/time heating load mini type high temperature hot-blast stove, belong to the horizontal hot air furnace technical field.

Hot blast and heat supply are fast because of can directly supplying with for horizontal hot air furnace, small investment, do not need auxiliary equipment such as water and water treatment, do not make pressure-vessel, security of operation, the coal utilization is wide, but advantages such as operation mechanization have been widely used in the industries such as heat supply, heating system and food medicinal material, machine components, paint drying.But existing horizontal hot air furnace makes the heat exchange of air and flue gas abundant inadequately because of the structure of its heat exchanger, and the heat of flue gas can not maximize the use, so the thermal efficiency is not high enough, in addition, the pipe of high-temperature region places high-temperature flue gas for a long time, and very easy scaling loss or be out of shape impairedly influences this stove life-span.

The purpose of this utility model is a kind of high temperature hot-blast furnace with new construction heat exchanger of design, makes that the thermal efficiency improves, long service life, it be particularly useful for caloric value be 500,000 kilocalories/time following operating mode.

The combustion apparatus that the utility model is made up of coal feeding bucket, reciprocal grate, burner hearth, the heat exchanger of being made up of inner cylinder, outer cylinder, air duct, exhaust gases passes, exhaust opening, cold wind import, hot-blast outlet and the cold flue gas return duct of burner hearth smoke outlet setting are formed, and it is characterized in that:

1. the two is concentric drums for inside and outside cylinder, its top is by top seal, annulus between inside and outside cylinder is provided with above (the comprising a row) convection bank of a row with one heart, two ends of tube bank are connected on the upper and lower annular tubesheet, and annular tubesheet is the annular slab that has the knot that expands more than 1 on this, the interior tube bank interlayer of inner cylinder and outer cylinder is provided with intermediate sleeve, and inner cylinder is to be provided with 3 above fin groups, inside upper part around the outside from top to bottom to be provided with the cylinder that the fin groups that (comprises 2) more than 2, center are provided with 1 above flue gas guiding awl;

2. described air duct is by placing the circuitous passageway of the level of forming perpendicular to the polylith dividing plate of convection bank and being made up of with the vertical passageway between inner cylinder intermediate sleeve;

3. described exhaust gases passes is by fume collecting chamber, the convection bank on the inner cylinder that communicates with burner hearth, top, and the flue gas collecting box of bottom is formed.

Operation principle of the present utility model is that high-temperature flue gas is come out earlier by furnace chamber and the cold flue gas of being come by smoke outlet mixing makes its temperature reduce to 1050 ℃.This flue gas earlier through in inner cylinder, the air in bottom and vertical air passageway carries out radiation heat transfer, passes through inner cylinder top then, carries out heat convection with air.And then change 180 ° of curved backs fast by convection bank by the fume collecting chamber at top, and flow heat convection with the vertical air that washes away smoke pipe, then discharge by exhaust opening to the flue gas collecting box.Because air, flue gas flow are far beyond original length, and in the convection current area under control, flue gas flow rate is original again fast, air again a more top-down vertical passageway, so heat can fully exchange, the thermal efficiency height of stove, many places are provided with the good fin of thermal conductivity in addition, make the thermal efficiency of stove just higher, and the fin of inner cylinder and guiding awl also can play good effect to the dedusting of flue gas.In addition, the utility model causes disadvantages such as being out of shape torsional fracture because of institutes such as non-homogeneous expansion or internal stress for overcoming pipe connecting piece under the long term high temperature operating mode, the special upper perforated plate that will connect convection bank and inside and outside cylinder is designed to have the annular slab structure that annular expands and ties more than 1, remedy the uneven disadvantage of its distortion with the telescopic characteristics of being heated by the knot that expands, thereby make this hot-blast stove life-span long.

Embodiment: radiation---convection current concentric type high temperature hot-blast furnace

The overall structure schematic diagram of Fig. 1 present embodiment

The A-A cutaway view of Fig. 2 Fig. 1

Among the figure: (1) coal bunker, (2) reciprocal grate, (3) burner hearth, (4) exhaust opening, (5) flue gas collecting box, (6) outer cylinder, (7) smoke pipe bundle, (8) dividing plate, (9) fin, (10) intermediate casing, (11) are annular tubesheet down, (12) fin groups, (13) flue gas guiding awl, (14) go up annular tubesheet, and knot expands (15), (16) top cover, (17) inner cylinder, (18) hot-blast outlet, (19) cold flue gas return duct, (20) go up smoke collection pipe, (21) cold wind import.

The combustion apparatus that the hot-blast stove of present embodiment is made up of coal bunker (1), reciprocal grate (2), burner hearth, concentric type heat exchanger of being made up of inside and outside cylinder (17,6) and near the cold flue gas return duct (19) that is arranged at the burner hearth exhanst gas outlet are formed, flue gas is with after cold flue gas is mixed, make the cigarette temperature control at 1050 ℃, this flue gas passes through inner cylinder (17) to upper smoke collecting chamber (20), pass through convection current smoke pipe bundle (7) again to flue gas collecting box (5), discharge from exhaust opening (4).Cold air is entered by cold wind import (21), upwards circuitous via the horizontal air passage that polylith dividing plate (8) is formed, turn 180 ° then, from the vertical air passage formed between inner cylinder (17) and the intermediate sleeve (10) from top to bottom, export by hot-blast outlet (18) at last.The inboard first half of inner cylinder (17) and the outside whole all are provided with 3 and 8 fin groups (12) as shown in Figure 1 respectively, and its centre is provided with flue gas guiding awl (13) again.Above-mentioned these structures greatly increase air, flue gas flow, therefore heat exchange is abundant, being provided with of fin (9) in the setting of above-mentioned fin (12) and the flue dust tube bank all can make flue gas conduct heat, therefore the original hot-blast stove of whole thermal efficiency ratio of stove is much higher, convection bank increases flue gas flow rate in addition, flue gas is strengthened conduct heat.The setting of the fin (12) of inner cylinder (17) and guiding awl (13) makes flue gas ash removal effective in addition.Present embodiment is provided with three smoke discharging tube banks (7) with one heart at annulus, the upper perforated plate (14) of installing tube bank is designed to be made up of two annular rings in the present embodiment, and (15) are tied in the expansion that is provided with two annular packings in being connected between the annular ring, between annular ring and the inner cylinder.Owing to when hot operation, be in for a long time the tube bank expansion situation difference on the different-diameter, the internal stress that becomes due to the difference of its swell increment can be remedied with the knot that expands, thereby disadvantage can be overcome by one-tenth crack due to the internal stress, make the long service life of stove.

Claims

1, a kind of radiation-convection current concentric type high temperature hot-blast furnace, the combustion apparatus of being formed by coal feeding bucket (1), reciprocal grate (2), burner hearth (3), by inner cylinder (17), outer cylinder (6), air duct, exhaust gases passes, the cold flue gas return duct (19) that heat exchanger that exhaust opening (4), cold wind import (21), hot-blast outlet (18) are formed and burner hearth smoke outlet are provided with is formed, and it is characterized in that:

(1) in, the two is concentric drums for an outer cylinder, its top is sealed by top cover (16), in, annulus between the cylindrical is provided with row's above convection current smoke pipe bundle (7) with one heart, two ends of this tube bank are connected to, on the following annular tubesheet (14,11), and this upper perforated plate (14) is for having the annular slab of the knot (15) that expands more than 1, be provided with intermediate sleeve (10) between the internal flue bundle of inner cylinder and outer cylinder, inner cylinder is to be provided with 3 above fin groups (9) around the outside from top to bottom, inside upper part is provided with 2 above fin groups (9), the center is provided with the cylinder of 1 above flue gas guiding awl (13);

(2) described air duct is by placing the circuitous passageway of the level of forming perpendicular to the polylith dividing plate (8) of convection bank and being made up of with the vertical passageway between inner cylinder (17) intermediate sleeve (10);

(3) described exhaust gases passes is made up of the flue gas collecting box (5) of the fume collecting chamber (20) on the inner cylinder (17) that communicates with burner hearth (3), top, convection bank (7), bottom.

2,, it is characterized in that the described annular tubesheet (14) of going up for being formed, between ring, the expansion that is provided with inflatable flexible annular packing more than 2 between interior ring and inner cylinder ties by 2 above rings by the described high temperature hot-blast furnace of claim 1.

3,, it is characterized in that the anti-smoke pipe bundle of described convection current (7) the every pipe of serving as reasons is provided with the tube bank that 5 above fin groups (12) are formed from top to bottom by the described high temperature hot-blast furnace of claim 2.