CN208012082U - Expanding surface flue gas fired-boiler - Google Patents

Abstract

The utility model discloses a kind of expanding surface flue gas fired-boiler, includes mainly burner, shell, front smoke box, flue, fan annular expansion face, the second backhaul smoke pipe, third backhaul smoke pipe, turns smoke-box and rear smoke box, it is characterised in that：In shell, it is disposed with third backhaul smoke pipe and the second backhaul smoke pipe from top to bottom, flue is placed in below smoke pipe, it is circumferentially welded with several groups expanding surface in ripple tubular or straight cylinder shape furnace outer wall face, every group of expanding surface on same cross section has four fan annular expansion faces to constitute, and there are V-type spaces between adjacent two pieces of fan annular expansions face；The fan annular expansion face of cross-section or variable cross-section connect the welding manner using single side V-butt with flue.The utility model increases effectively the heat dissipation area of flue outer surface, improves the heat convection efficiency of flue and stove water, accordingly accelerate the transmission of flue internal heat, advantageously reduce temperature in flue, reduce the production quantity of NOx by using fan annular expansion face.

Description

Expanding surface flue gas fired-boiler

Technical field

The utility model is related to gas fired-boiler technical fields, more particularly to a kind of expanding surface flue gas fired-boiler.

Background technology

Ignition temperature is up to 1500 DEG C or more in conventional gas boiler furnace flue, and inboard wall of furnace face temperature is more than 1000 DEG C. In gas fired-boiler, furnace outer wall face, which is directly contacted with stove water, carries out heat convection.During entire boiler heat transmits, lead to The heat for crossing furnace outer wall face and stove Water transport occupies 60% to the 70% of transmission heat amount.Usual furnace outer wall face temperature is low In the evaporating temperature of stove water, such as normal-pressure boiler, stove water evaporation temperature is about 100 DEG C, it is seen then that the inside and outside wall surface temperature of flue Up to 900 DEG C or more of difference.

In engineering design, the conventional thinking of designer be by increase the space of burner hearth obtain larger radiation by Hot face and convection heating surface.The certain ripple tubular of diameter or straight cylinder shape flue, the surface area in internal and external walls face are always limited 's.So in order to increase heating surface area, usual way is exactly the diameter for increasing flue or the number for increasing flue.And this Kind obtains the way of larger heating surface by increasing furnace cavity, although greatly improving the power of separate unit gas fired-boiler, Overall thermal efficiency does not improve a lot but, increases investment and the maintenance cost of equipment instead.As it can be seen that traditional flue tube structure It is difficult to improve the heat transference efficiency of gas fired-boiler.

Invention content

In order to overcome the above-mentioned deficiencies of the prior art, the utility model discloses a kind of expanding surface flue gas fired-boilers.

The utility model discloses a kind of expanding surface flue gas fired-boiler, including burner, shell, front smoke box, flue, fan ring Shape expanding surface, third backhaul smoke pipe, turns smoke-box, rear smoke box and water inlet pipe, outlet pipe, smoke exhaust pipe, support at the second backhaul smoke pipe Pipe, pedestal etc., it is characterised in that：In shell, it is disposed with third backhaul smoke pipe and the second backhaul smoke pipe from top to bottom, flue is Ripple tubular or straight cylinder shape, are placed in below smoke pipe；Circumferentially it is welded with several groups expanding surface on furnace outer wall face, adjacent two The spacing of group expanding surface is 10-20mm, and every group of expanding surface is made of four pieces of fan annular expansion faces, adjacent two pieces of fan annular expansions face Between there are V-type spaces, four V-type spaces of every group of expanding surface to be respectively positioned on the horizontal line and vertical line by flue center； The cross section in every piece of fan annular expansion face is trapezoidal or rectangle, and the size of trapezoid cross section is as follows：The bottom ruler contacted with flue Very little is 5-10mm, and the upper bottom edge size being exposed in stove water corresponds to 2-5mm, and the size bottom edge of rectangular section can use 5-8mm, high Depending on spending gap size between flue and smoke pipe, stock size 20-40mm, four pieces of fan annulars in every group of expanding surface The height of expanding surface allows different；The bottom in every piece of fan annular expansion face is using outside single side V-butt, with straight cylinder shape flue It is welded at the wave crest of wall surface or ripple tubular flue, furnace outer wall face collectively constitutes the outer heat dissipation of flue with fan annular expansion face Face.

The fan annular expansion plane materiel material is the higher ordinary carbon steel of thermal coefficient, and half is provided in fan annular expansion face root V-butt is welded on fan annular expansion face on furnace outer wall face by welding, it is ensured that contact is good.

The fan annular expansion face is equally spaced on furnace outer wall face, and arrangement four is identical in same cross section circumferential direction Fan annular expansion face, fan annular expansion face bottom edge radian it is identical as the surface radian of flue.

There are V-type space, the equal positions in four V-type spaces of every group of expanding surface between adjacent two pieces of fan annular expansions face On horizontal line and vertical line by flue center.V-type space efficiently reduces circumferential constraint when flue expanded by heating.

Compared with prior art, the utility model has the beneficial effects that：First, adding fan annular expansion on flue wall surface The space inside gas fired-boiler is greatly utilized in face, under the premise of not changing furnace cavity size, improves furnace outer wall The heat dissipation area in face increases the total heating surface product of boiler.Second is that the heat dissipation area by increasing furnace outer wall face, carries and has done stove The heat convection efficiency in gall bladder wall face makes flue heat dissipation faster, to advantageously reduce temperature and the smoke evacuation temperature of boiler in flue Degree, improves the thermal efficiency of entire gas fired-boiler；Third, flue fans annular expansion face in addition, the radiating surface of flue is effectively increased Product, accelerate the transmission of flue outside heat, be conducive to quickly reduce ignition temperature in flue, to reduce exhaust gas temperature with The production quantity of NOx keeps gas fired-boiler more energy efficient more environmentally friendly.

Description of the drawings

Fig. 1 is the structural schematic diagram of expanding surface flue gas fired-boiler；

Fig. 2 be in expanding surface flue gas fired-boiler A-A to sectional view；

Reference numeral：1- burners；2- front smoke boxs；3- shells；4- fans annular expansion face；5- the second backhaul smoke pipes；6- Three backhaul smoke pipes；7- flues；8- turns smoke-box；Smoke box after 9-.

Specific implementation mode

The utility model is further illustrated below in conjunction with the accompanying drawings.

Expanding surface flue gas fired-boiler include mainly burner, shell, front smoke box, flue, fan annular expansion face, second time Journey smoke pipe, turns smoke-box, rear smoke box and water inlet pipe, outlet pipe, smoke exhaust pipe, support tube, pedestal at third backhaul smoke pipe.In shell, It is disposed with the second backhaul smoke pipe and third backhaul smoke pipe, second and third backhaul smoke pipe is connected by turning smoke-box, band fan annular expansion face Flue be arranged in below smoke pipe.Ripple tubular or straight cylinder shape can be used in flue, in the wave crest or straight cylinder shape of corrugated internal furnace The circumferentially upper equidistantly welding fan annular expansion face of the outside wall surface of flue, spacing 10-20mm.Fan annular expansion plane materiel material, which uses, leads The hot higher ordinary carbon steel of coefficient, by being provided with half V-butt in fan annular expansion face root, by the way of welding, fan Annular expansion face transverse weld ensures that contact is good on furnace outer wall.When arrangement fans annular expansion face, in furnace outer wall It is disposed with four fan annular expansion faces in the same cross section circumferential direction in face, there are V-type space between adjacent two pieces of fan annular expansions face, Four V-type spaces of every group of expanding surface are respectively positioned on the horizontal line and vertical line by flue center.Every piece of fan annular expansion face Cross section can be trapezoidal or rectangle.The size of trapezoid cross section is as follows：The bottom size contacted with flue is 5-10mm, cruelly The upper bottom edge size being exposed in stove water corresponds to 2-5mm, and the size bottom edge of rectangular section can use 5-8mm, highly according to flue with Depending on gap size between smoke pipe.Burner is fixed on gas fired-boiler, at the same shell corresponding position be equipped with outlet pipe, The components such as return pipe, smoke exhaust pipe, safety valve, flame-observing mirror and drain pipe, shell lower end are equipped with pedestal.

When gas fired-boiler is run, combustion gas generates thermal-flame by burner, discharges heat.Flue gas enters the through turning smoke-box Two return smoke pipe, flows to front smoke box.Again after the heat exchange of third backhaul smoke pipe, flue gas is discharged into greatly by the chimney above gas fired-boiler Gas.The effect that convection current in order to increase flue part is conducted heat, improves the evaporation rate of gas fired-boiler, is welded on furnace outer wall face Fan annular expansion face.Heat in flue is by flue wall surface and fan annular expansion facing external radiation, in inner of the boiler chamber water Heat convection occurs with flue wall surface and fan annular expansion face, stove water is heated.Water inlet of the cold water from boiler side walls lower part Pipe enters in stove, and flue, fan annular expansion face root are immersed in stove water, stove water and flue, fan annular expansion face contact position hair Raw free convection, heats stove water.Hot water is discharged from the outlet pipe on boiler side walls top.

In addition, being provided with energy-saving control system outside gas fired-boiler, the processes such as water supply, the burning of boiler are adjusted automatically Section.The warning devices such as safety valve are provided on shell, it is ensured that the operation of gas fired-boiler highly effective and safe.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection domain within.

Claims (2)

1. Include mainly burner, shell, front smoke box, flue, fan annular expansion face, the 1. a kind of expanding surface flue gas fired-boiler Two return smoke pipe, turns smoke-box and rear smoke box at third backhaul smoke pipe, it is characterised in that：In shell, it is disposed with third from top to bottom Backhaul smoke pipe and the second backhaul smoke pipe, flue are ripple tubular or straight cylinder shape, are placed in below smoke pipe；On furnace outer wall face It is circumferentially welded with several groups expanding surface, the spacing of two adjacent groups expanding surface is 10-20mm, and every group of expanding surface is expanded by four pieces of fan annulars Developable surface is constituted, and there are V-type space between adjacent two pieces of fans annular expansion face, four V-type spaces of every group of expanding surface are respectively positioned on logical It crosses on the horizontal line and vertical line at flue center；The cross section in every piece of fan annular expansion face is trapezoidal or rectangle, trapezoid cross section with The bottom size of flue contact is 5-10mm, and the upper bottom edge size being exposed in stove water corresponds to 2-5mm, the bottom of rectangular section Side size is 5-8mm, depending on the gap size of the height in every piece of fan annular expansion face between flue and smoke pipe, stock size For 20-40mm, the height in four pieces of fan annular expansion faces in every group of expanding surface allow different, furnace outer wall face and fan annular expansion Face collectively constitutes the outer radiating surface of flue.
2. 2. expanding surface flue gas fired-boiler according to claim 1, it is characterised in that：The bottom in every piece of fan annular expansion face Side uses single side V-butt, is welded at the wave crest of straight cylinder shape furnace outer wall face or ripple tubular flue.