CN2392125Y - Enhanced heat transferring type boiler using oil (gas) fuel - Google Patents

Abstract

The utility model discloses a fuel (gas) boiler, wherein, the boiler is enhanced to transfer heat, the boiler has higher efficiency and stable efficiency characteristic, the boiler is operated in an overload mode, and the boiler has no whistler type noise and vibration. The inner part of a smoke pipe of the convection heating surface of an ordinary fuel (gas) boiler which is composed of a housing body, a combustion chamber, a convection heating surface, etc., is additionally provided with a component which is provided with a half elliptical partition board 20, a half elliptical through hole 18 and a narrow board section 19. When the utility model is operated, high-temperature smoke flow through the smoke pipe of the convection heating surface so that the smoke exhaust temperature is decreased to a minimum allowable value. Accordingly, the utility model has the advantages that the heat transfer efficiency is enhanced, the boiler efficiency is enhanced, the efficiency characteristic is stable when load is changed, and the utility model is free from whistler type noise and vibration.

Description

Augmentation of heat transfer fuel oil (gas) boiler

The present invention relates to a kind of fuel oil (gas) boiler, particularly a kind of augmentation of heat transfer fuel oil (gas) boiler.

Existing fuel oil (gas) boiler is by shell body, combustion chamber, and convection heating surface etc. are formed.Convection heating surface is many steel pipes that are welded on the tube sheet, is called smoke pipe, and its heat transfer property is poor.In order to overcome this shortcoming, make smoke pipe with the rolled thread barrel usually.The rolled thread barrel relies what wall thread protrusion part, the structure of air-flow limit interlayer in the periodic disturbance pipe, and the mixing of stiffened edge interlayer air-flow improves heat transfer coefficient.Partly have only 2～3 millimeters by what internal face thread protrusion, be difficult to realize the strong mixing in air-flow limit interlayer and air-flow intermediate layer, the effect of augmentation of heat transfer is little, and boiler efficiency is not high.

Task of the present invention provides a kind of improved fuel oil (gas) boiler, can augmentation of heat transfer, higher efficient and efficiency characteristic are stably arranged, and overload operation does not have whister-type noise and vibration yet.

Task of the present invention is finished as follows: make following element, on the corrosion resistant plate that width differs (0.5～0.8 millimeter of thickness), many half ellipse garden shape dividing plates and corresponding half ellipse garden shape through hole are arranged, dividing plate is 45 ° of inclinations, left and right sides interphase distribution is the narrow boards section of 10 millimeters of width between the periphery of through hole.Element is inserted in the smoke pipe.Fuel oil (gas) high-temperature flue gas that the back generates that burns in the combustion chamber enters smoke pipe, and in flow process, the dividing plate of whenever flowing through is all wanted throttling, mixes, and collision also mixes with the flue gas of coming from half ellipse garden shape through hole.The temperature in air-flow limit interlayer and air-flow intermediate layer is consistent all the time like this, has prolonged the holdup time of flue gas in pipe.Reach maximum by what stove water and flue gas heat exchange thermal gradient energy, heat-exchange time prolongs, and heat transfer coefficient improves and makes exhaust gas temperature be reduced to Minimum Acceptable Value, so strengthened heat-transfer effect, has improved boiler efficiency; Little by what throttling place reduced cross-sectional area, cigarette speed is low, and the boiler overload operation does not produce whister-type noise and vibration yet; Boiler efficiency is steady.

The present invention is easy to assembly, and when the example structure that will describe in detail below adopting, the boiler cost does not increase.

Below with reference to accompanying drawing invention is described in further detail.

Fig. 1 is the longitudinal sectional drawing of a kind of concrete structure of the present invention.

Fig. 2 is the part sectioned view of smoke pipe 12 among Fig. 1.

Fig. 3 is the profile of Fig. 2 along the 3-3 line.

Boiler feedwater enters the steam space of being made up of the smoke pipe 12 of shell body 11 flues 3 tube sheets 13,9 convection heating surfaces by water inlet base 2.Water level meter 6 is indicated the interior water level of coming out of the stove.Hot water is discharged by hot water outlet base 10, and the steam of generation enters atmosphere by steam discharge base 7.Combustor and base 15 link.Fuel oil (gas) is in combustion chamber 14 internal combustion of being made up of flue 3 tube sheets 13 refractory masses 16.The high-temperature flue gas that generates enters in each smoke pipe 12 of convection heating surface, and the heat in the flue gas that flows is passed to stove water by the tube wall of smoke pipe.After temperature reduced, flue gas entered atmosphere by chimney 8.Boiler body is supported on the base 1.

Enter the smoke pipe 12 of convection heating surface when flue gas after, because of the hurdle that covers of half ellipse garden shape dividing plate 20, another part throttling through the smoke pipe cross section, mix the back, separated into two parts: a part and 19 collisions of narrow boards section; Another part is by half ellipse garden shape through hole 18.Two parts air-flow mixes before back one and half ellipse garden shape dividing plates 20.Mixed air-flow mixes through throttling again, and collision mixes, and goes down with this.By the flow through process of smoke pipe of what flue gas is that continuous throttling mixes, the process that collision mixes and pushes ahead by waveform.So, consistent all the time to the temperature of the air-flow limit of stove heat transfer water interlayer with the temperature in air-flow intermediate layer, so just the temperature difference of flue gas and the heat exchange of stove water is brought up to maximum; The flow process of flue gas in smoke pipe prolongs, and the heat radiation time of flue gas also prolongs thereupon; Throttling has increased flow velocity, has improved heat transfer coefficient.Can make exhaust gas temperature be reduced to Minimum Acceptable Value like this.Therefore, this fuel oil provided by the invention (gas) boiler can augmentation of heat transfer, and higher efficient and efficiency characteristic are stably arranged.Little by what throttling place reduced cross-sectional area, the boiler overload operation can not produce whister-type noise and vibration because of speed increases yet.

The heat-insulation layer of shell body is formed by covering plate 4 insulation materials 5 in the outside of boiler, and by flame retardant coating 16, heat-insulation layer 17 is formed the bottom heat-insulation layer, reduces the radiation loss of body of heater.

Claims (4)

1, fuel oil (gas) boiler of being made up of base [1], shell body [11], flue [3], tube sheet [9], [13], convection heating surface smoke pipe [12], chimney [8] etc. is characterized in that installing additional in the smoke pipe [12] at convection heating surface the element of making of 0.5～0.8 millimeter corrosion resistant plate of thickness.

2, boiler according to claim 1, it is characterized in that having many half ellipse garden shape dividing plates [20] and corresponding half ellipse garden shape through hole [18], half ellipse garden shape dividing plate and smoke pipe axis are 45 ℃ of inclinations, left and right sides interphase distribution, narrow boards section [19], the periphery [21] of half ellipse garden shape through hole [18] fuses with half ellipse garden shape dividing plate [20].

3, boiler according to claim 2 is characterized in that partly the major and minor axis radius of the major and minor axis radius ratio half ellipse garden shape through hole [18] of ellipse garden shape dividing plate [20] is little 0.3～0.5 millimeter, 10 millimeters of narrow boards section width;

2 millimeters of the little what smoke pipe of the overall width diameters of the periphery [21] of half ellipse garden shape through hole [18].

4, according to claim 1,2,3 described boilers, it is characterized in that 150～200 millimeters of the length of the little what smoke pipe of total length [11], be fixed on the port of export of smoke pipe [12] with bearing pin.