CN2140506Y - Coal burning hot-air stove with corrugated spiral plate heat exchanger - Google Patents

Abstract

The utility model provides a coal burning hot-air stove with a corrugated spiral plate heat exchanger, mainly comprising a burner and a heat exchanger, and is characterized in that a corrugated spiral plate heat exchanger is adopted. Compared with the traditional up and down backfolding plate-fin heat exchangers, the coefficient of the convective heat transfer of the utility model is increased by more than 1 time. Partial waste flue gas is recovered to a burn-out chamber, and a flue gas short circuit device is arranged additionally. The heat load of a stove wall and a stove roof is reduced. Thereby, the utility model has the advantages of long the service life, compact structure, and low cost.

Description

Coal burning hot-air stove with corrugated spiral plate heat exchanger

The utility model relates to a kind of high exothermic coefficient, low energy consumption, and the hand that reliability is high burns coal-fired hot-blast stove, is a new technology that is applied to agricultural, industry, civil heating, heating field, and patent classification is a F portion, F27 stove, F28 heat exchange.

The utility model is the new product after existing similar type is made significant improvement.Current, what the output similar to the utility model was bigger on the domestic market mainly is the RFL type stove that is referred to as the infrared emanation stove, this stove is upright tube ready-package, full stove is by steel plate welding combination, combustion chamber and heat exchanger are made of one, its heat exchanger is a plate-fin, flue gas and air in flaggy separately, be respectively turn back up and down mobile.This machine compact conformation, manufacturing process is simple, removable, install fast, use convenient transportation, cost lower.But its defective is also more outstanding, since flue gas and air flow channel be about Zigzag type, fluid flow resistance is bigger, more, the easy incrustation of consumption of power, again because of thermal-flame in the combustion chamber directly to furnace wall, furnace roof radiation heat release, cause these position thermic loads excessive, the easy thermal deformation of furnace wall, furnace roof and associated part, easy scaling loss, need often maintenance, bring a lot of troubles to the user, to making this be fit to middle-size and small-size user, the hot-blast stove with more advantage, because of can't address the aforementioned drawbacks be subjected to day by day the user treat coldly and assembly abandons.

The purpose of this utility model provides a kind of new construction of coal-fired hot-blast stove.This new architecture has solved its furnace wall, yielding, the easy scaling loss of furnace roof, the excessive defective of fluid internal resistance on the advantage basis that keeps RFL type stove, and tries to achieve that unit materials consumption decreases, the type of furnace is more compact.

The heat exchanger that the utility model adopted, make every effort to do not improve or the condition of the fluid resistance that decreases under, obtain higher coefficient of convective heat transfer, change heat exchanging process, with the furnace wall radiation heat release of RFL type stove is main, becomes the interior convection heat transfer of runner of the present utility model into main, thereby reduces the thermic load of furnace wall, make stove be difficult for being guaranteed reliably working by scaling loss.Its technical scheme is: the one, adopt vertical ripple sieve plate turning type heat exchanger, and with the reinforcement convection heat transfer, the 2nd, the useless flue gas of part is reclaimed, to reduce the temperature and the thermic load of furnace wall and furnace roof; The 3rd, in the outer space of furnace wall and furnace roof, install radiant heat additional and receive conductive features, with the quickening furnace wall, the heat release of furnace roof, the 4th, establish burner hearth flue gas short-circuiting means, with under the non-normal working situation, protection furnace wall and heat exchanger can be not overheated and impaired.

The utility model, owing to adopted the ripple spiral heat exchanger, fluid moves along the Luo Xuan line, existing similar furnace heat exchanger fluid is fold return motion up and down, reduced fluid flow resistance significantly, thereby for improving fluid velocity, strengthening convection heat transfer provides possibility.Facts have proved, the Luo Xuan runner runner of turning back, (runner equivalent diameter, fluid density, speed, temperature) under the same conditions, exothermic coefficient can exceed about one times.Again because of sieve rotating plate is corrugated, the ripple direction is vertical with direction of flow, cause fluid to be turbulent disturbance, strengthened heat release, can obtain higher coefficient of convective heat transfer, thereby make utility model compact more, with the material amount only quite existing contrast type 2/3rds.Because the rotating heat exchanger of ripple sieve strengthened convection heat transfer, thereby provide possibility for the radiation heat release that reduces furnace wall, furnace roof.Facts have proved that the heat of current infrared emanation stove about 60% is by furnace wall, furnace roof heat radiation conduction, the utility model is then reduced to the radiation conduction heat of furnace wall, furnace roof about 20%.Major measure is to increase the volume of secondary furnace, and the useless flue gas of a part is recovered to secondary furnace; flue gas mean temperature in the secondary furnace is reduced to below 850 ℃; the secondary furnace structure of big volume is elongated radiation length, protects furnace wall, furnace roof to avoid fire damage effectively.Though combustion chamber of the present utility model still is positioned at heat exchanger, itself and heat exchanger become the branch body structure in fact, and the thermal deformation of combustion chamber can not involved heat exchanger, have guaranteed the stability of heat exchanger general structure.The easy scaling loss of the current similar type of furnace, one of reason that life-span is low is that under improper situation, the grate in the heat exchanger is still very vigorous, very big heat is vexed in burner hearth, furnace wall so that heat exchanger wall surface temperature continue to be raise cause metallic plate to cross thermal softening and influences furnace life.At this situation, this is novel to have added the heat sink that makes the cooling of burner hearth automatic ventilation, when this device works, and the flue gas heat exchanger of will not flowing through, and directly enter atmosphere, and to enter cold wind by fire door be the burner hearth cooling.Above-mentioned all great innovative measures all decrease existing type unit materials consumption of utility model and supporting power, and most important is to have obtained this type stove life-span that makes that domestic a lot of expert endeavours to reach to prolong, anti-burning, reliable good effect.

Accompanying drawing has been expressed the structure of ripple spiral heat exchanger coal-fired hot-blast stove.(for the purpose of clear, structural acessory such as fire door, smoke induced draught fan, hot-air air-introduced machine, ash door and air, the flue etc. total to the current similar type of furnace do not have sign in the accompanying drawings).

Below in conjunction with drawings and Examples, the utility model is described in further detail.

The hot-blast stove of the utility model structure, mainly by burner, heat exchanger two large divisions with some annexes constitute, part (1) (2) (3) (4) (5) (6) constitutes the burner part, part (7) (8) (9) (10) (11) (12) (13) constitutes the heat exchanger part.

When the hot-blast stove operate as normal, the fire coal that is burning is covered with on fire grate (2), and flame is filled in the space of combustion chamber (3), and the combustion chamber is made of cylindrical case and the inner lining refractory that low carbon steel plate is welded into.Its diameter and highly routinely computing formula calculate and to try to achieve.Burning generates the high-temperature flue gas rising and enters secondary furnace (5), and secondary furnace is first top tubular structure that boiler plate is welded into, and tangentially has an interface flue (6) that leads to circulation road (7) in the heat exchanger flue gas at an upper portion thereof.When high-temperature flue gas enters secondary furnace (5) by combustion chamber (3), the useless flue gas that enters with the space of coming from the flue gas collection box via between combustion chamber (3) outer wall and the inner furnace body (4) mixes, mixing ratio can reclaim the gatage size by useless flue gas and regulate, and is not more than 850 ℃ to keep the flue gas mean temperature in the secondary furnace (5).After flue gas entered runner (7), flow velocity increased to 12-14m/s.High-temperature flue gas flow through in the process of runner (7) and flue gas outer shroud runner (8) with a wall every Cryogenic air carry out strong convective heat exchange, temperature descends gradually, flow to exhanst gas outlet (1) and enter combustion-supporting air-introduced machine inlet, enter atmosphere by the outlet of this blower fan through a short duct.In combustion-supporting air-introduced machine is exported to the smoke exhaust pipe section, install a short tube (tube) and communicate with flue gas collection box (19), realize that flue gas reclaims.The seam of charcoal steel plate is hanged down with ripple in the two side of flue gas inner and outer ring runner (7) (8).Bigger as heat exchanger, should on the appropriate location of corrugated plating, reinforce with angle ring.(as having a power failure) is installed in the electromagnetic valve door in the flue gas short circuit pipe (16) when stove is in operation the improper situation of appearance, and smoke exhaust pipe is open-minded, the while oven door opening, and outside air enters combustion chamber (3) by fire door, directly enters atmosphere through interface flue (6).

Air in runner with the flue gas reverse flow, outside air enters the outer runner (14) that is surrounded by heat exchanger urceolus (18) from tangential air inlet (12), enters hot air outlet (9) via interior circulation road, middle circulation road (11) (10) and is led to by air-introduced machine and use hot device.Be furnished with a radiant heat of making by corrugated plating in the interior circulation road (10) and receive conductive features (13), this part receives the radiant heat from part (5) wall, conduct to the air that flows in interior circulation road (10) with convection type thereupon, in hot air outlet (9), also be furnished with the radiant heat that has passage and receive conductive features (17), in order to receiving element (5) top radiant heat, and the hot-air of flowing through is herein given in conduction thereupon.The inside and outside wall in circulation road (10) (11) is by the corrugated plating manufacturing in the air.Furnace roof cap (15) is used for the protection on heat exchanger top, reduces heat loss.

Claims (7)

1, a kind of coal-fired hot-blast stove is characterized in that: heat exchanger is a ripple spiral plate type structure, and the combustion chamber is positioned at the centre of heat exchanger and becomes split type with heat exchanger, and part waste gas is recycled to secondary furnace, to reduce the thermic load of furnace wall and furnace roof.

2, hot-blast stove according to claim 1 is characterized in that: the one or both sides of the interior lateral wall in circulation road (7), outer shroud runner (8), the interior circulation road (10) of air, middle circulation road (11) are made of corrugated plating in the flue gas.

3, according to claim 1,2 described hot-blast stoves, it is characterized in that: the ripple spiral plate is made the interior lateral wall of runner (7) (8) (10) (11) with flat board when not needing very big coefficient of convective heat transfer.

4, hot-blast stove according to claim 1 is characterized in that: leave certain interval as useless flue gas recovery approach between the outer wall of combustion chamber (3) and inner furnace body (4) wallboard, and be applied to the outer wall of cooling combustion chamber (3).

5, hot-blast stove according to claim 1 is characterized in that: flue gas short-circuiting means (16) is housed, is equiped with in this short circuit smoke exhaust pipe manually or the electric opening and closing air door.

6, hot-blast stove according to claim 1 is characterized in that: between the madial wall in circulation road (7), be equiped with radiant heat and receive conductive features (13) in the lateral wall of secondary furnace (3) and flue gas, this part is with glass card or the manufacturing of dull and stereotyped weldering wing.

7, hot-blast stove according to claim 1 is characterized in that: hot-blast outlet (9) device that is positioned at secondary furnace (3) over top has radiant heat to receive conduction plate (17).This part is with profile plate or tubing manufacturing.

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