CN2033481U - Water and smoke-tube boiler - Google Patents

Abstract

The utility model relates to a horizontal type water and smoke-tube mixing type boiler. Both sides of the boiler are provided with water pipe convection heat exchange chambers. After flue gas with high temperature is radiated and the heat is interchanged through a hearth and a combustion chamber, the flue gas enters the convection heat exchange chambers and transversally transversely flushes the indoor water pipes, and then the flue gas enters a single-pass smoke pipe in the boiler barrel. By adopting the structure, the horizontal type water and smoke-tube mixing type boiler lowers the temperature of the flue gas which enters the smoke pipe, reduces the diameter of the boiler barrel, and solves the problems that the pipe board of the prior boiler is cracked, the water is leaked and the metal consumed is much. The utility model has the advantages of compact structure and high thermal efficiency. The horizontal type water and smoke-tube mixing type boiler is suitable for being used for the central heating.

Description

Extreme misery pipe composite boiler

The utility model relates to a kind of extreme misery pipe composite boiler that central heating is used that is suitable for, the drum part of horizontal of this boiler is placed on the fire grate top, the drum both sides are equipped with some with collection between the case and are connected water pipe, wherein form water-cooling wall, constitute burner hearth and secondary furnace radiation heating-surface near two drainpipes of fire grate.

Existing horizontal extreme misery pipe composite boiler, its structure are that water-cooling wall is formed by the water pipe that is close to same vertical plane in the drum both sides, and drum inside is provided with two backhaul smoke pipe bundles.Fuel burns on fire grate and produces high-temperature flue gas at first through drum and water-cooling wall radiation heat transfer, enter the first backhaul smoke pipe in the drum from the back smoke box again, being turned back by front smoke box enters the second backhaul smoke pipe heat exchange, last flue gas by the back smoke box through economizer or connect through air-introduced machine and discharge by chimney.The said structure decision high-temperature flue gas three backhaul heat transfer process of boiler are analyzed this heat transfer process and are brought some problems to mainly contain two broad aspect for boiler.

First aspect is that the drum diameter is big, the consumption metal is many, and the thermal efficiency is low.It is in order to guarantee that boiler has enough heat exchange areas and actual internal area thereof that existing horizontal extreme misery pipe composite boiler adopts two backhaul smoke pipe bundles, so the drum diameter is very big, and metal consumption is many, and its heat exchange effect is also undesirable, and boiler thermal output is low.And, consider drum intensity and chamber structure, the drum diameter is subjected to certain limitation when making heavy duty boiler, so said structure is generally limited to make the per hour boiler below four tons of evaporation capacity at present.

Second aspect is tube-plate fracture, seepy question.Tube sheet particularly back tube sheet after operation a period of time, is easy to generate crackle until leaking at stove between the tube sheet bridge.It mainly is relevant with the effect of high-temperature flue gas analyzing its reason, the flue-gas temperature of coming out very high (generally being higher than 800 ℃) from secondary furnace, and the tube sheet generation alternating thermal stress that is heated causes the tube sheet Metal Crack.

In sum as seen, existing horizontal water pipe composite boiler is because of its heat exchange mode decision, and it is big to have the drum diameter inevitably, and metal consumption is many, the problem of the low and tube-plate fracture of the thermal efficiency.

For this reason, the purpose of this utility model is to improve above-mentioned boiler heat exchange structure and the extreme misery pipe composite boiler that provides a kind of drum both sides that the water pipe convection heat-exchange chamber is arranged, each water pipe in the Heat Room connects drum and collection case respectively, single backhaul smoke pipe is set in the drum, whole cooker furnace structure compactness, thermal efficiency height.

The utility model develops distortion and obtains on above-mentioned boiler structure basis, so its part and original boiler are basic identical, comprises that boiler, front and back tube sheet, water screen tube, smoke pipe, collection case, fire grate and associate member thereof form.The drum that has a smoke pipe still vertical equity is placed on the fire grate top, and the fire grate both sides are parallel with drum to be placed with two symmetries and to collect case greatly.Be provided with some between drum both sides and the collection case and connect water pipe, wherein form water-cooling wall, constitute the radiation heating-surface of burner hearth and secondary furnace near two drainpipes of fire grate.It is indoor that its residual water pipe of drum both sides is arranged on burner hearth both sides heat convection, and Heat Room is connected with the smoke inlet and the outlet of secondary furnace and front smoke box respectively.One way smoke pipe bundle is set in the drum.The whole heat transfer process of this boiler is as follows: fuel burns on fire grate and produces high-temperature flue gas, earlier with the water-cooling wall radiation heat transfer, enter the both sides Heat Room from secondary furnace again, the transversal flow indoor water pipe, produce heat convection with water pipe, compile the disposable one way smoke pipe in the drum that enters through front smoke box again through the flue gas of secondary heat exchange, after the back smoke box discharge by chimney.

Because the drum both sides are provided with the water pipe convection heat-exchange chamber, changed high-temperature flue gas heat exchange process in the past, increased water pipe transversal flow Convective Heat Transfer, improve the flue gas heat exchange effect, reduced the temperature when flue gas enters smoke pipe, solved the problem that tube sheet cracks because of the inequality of being heated, dwindled the drum diameter simultaneously, reduced metal consumption, for alleviating boiler weight, reducing manufacturing cost has certain realistic meaning.

In the above-mentioned boiler structure, tube sheet and smoke pipe can adopt flat tube sheet or common smoke pipe before and after it, and still, as adopting arch form tube sheet and threaded flue, for improving the tube sheet stress, it is more favourable to improve the smoke pipe heating surface area.And can save the stay bolt element, and further reduce smoke pipe quantity, dwindle the drum diameter, reduce metal consumption.

Transversal flow water pipe convection heat-exchange chamber is adopted in the burner hearth both sides, helps improving boiler thermal output, energy savings.The utility model with capacity boiler roughly the same relatively, the boiler structure compactness, it is few to consume metal material, manufacturing expense and mounting cost are low, and solved tube-plate fracture, problem such as leak.The boiler of this structure can realize that big capacity is close to fast-assembling, shortens installation period.

Introduce the utility model specific embodiment in detail below in conjunction with accompanying drawing.

Fig. 1 is ten tons of hybrid hot-water boiler structural front view of water water pipe.

Fig. 2 is above-mentioned boiler structure left view.

For ease of explaining boiler structure, introduce present embodiment below in conjunction with the high-temperature flue gas flow process, in the accompanying drawing, the combustion apparatus of boiler is a horizontal reciprocating furnace grate 1, fuel burns on fire grate 1 and produces high-temperature flue gas, this flue gas at first with water screen tube 7 radiation heat transfers of burner hearth and secondary furnace, again in smoke inlet 6 enters burner hearth both sides water pipe convection heat-exchange chamber 9, indoor each water pipe 10 heat convection of transversal flow, the both sides flue gas compiles in front smoke box 2 and enters heat exchange among the drum 4 internal thread smoke pipes 8 again, after back smoke box 5 flue gas is drained.The front and back tube sheet 3 of boiler adopts the arch form tube sheet.The wall of convection heat-exchange chamber 9 adopts refractory brick to be built into.Scummer 12 adopts mechanical automatic discharge.Water screen tube 7 is separately positioned on drum 4 both sides with heat convection water pipe 10 and is connected collection case 11.

Above-mentioned boiler manufacturing process and select material and existing Design and material basic identical, just variation has as mentioned above taken place in the heat exchanging part structure. This furnace thermal efficiency exceeds 4% than standard, and its capital construction installation fee reduces by 30% at least, and economic benefit and social benefit are better.

Claims (2)

1, extreme misery pipe composite boiler, mainly by drum (4), front and back tube sheet (3), water screen tube (7), smoke pipe (8), collection case (11), fire grate (1) and associate member thereof are formed, drum (4) vertical equity that has smoke pipe (8) is placed on fire grate (1) top, water screen tube (7) connects drum (4) and collection case (11) constitutes burner hearth and secondary furnace radiation heating-surface, this boiler is characterised in that respectively there is a water pipe convection heat-exchange chamber (9) that communicates with secondary furnace and front smoke box (2) the burner hearth both sides, this is indoor to have some water pipes (10) to connect drum (4) and collects case (11), is provided with one way smoke pipe bundle (8) in the drum (4).

2, boiler according to claim 1, tube sheet (3) adopts the arch form tube sheet before and after it is characterized in that, and smoke pipe (8) adopts threaded flue.

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