CN2364376Y

CN2364376Y - Internal preheating water-supply drum-type fuel oil and gas boiler

Info

Publication number: CN2364376Y
Application number: CN 97248172
Authority: CN
Inventors: 刘厚贵; 余荣
Original assignee: Hangzhou Kang Cheng Boiler Manufacturing Co Ltd
Current assignee: Hangzhou Kang Cheng Boiler Manufacturing Co Ltd
Priority date: 1997-11-13
Filing date: 1997-11-13
Publication date: 2000-02-16
Anticipated expiration: 2007-11-13

Abstract

The utility model belongs to a universal fuel oil and fuel gas pot shell type boiler. The utility model is characterized in that the inner part of a boiler water cavity is provided with an annular separating sleeve, the outer side of the upper part of the separating sleeve is provided with an annular water supply tank, and a boiler water saturation temperature zone is divided into a water entering boiler water zone belt with a lower temperature. Because the utility model is near a flue exhaust segment, the temperature difference of a heating surface is increased, the heat conduction effect of the utility model is improved, and the utility model play a function equal to the function of a coal economizer. The utility model can further increase the heating area and enhance the recovery and utilization of smoke gas heat quantity by being added with rib slices which are ranged in a triangular. The utility model has the advantages of small size, low steel consumption and high heat efficiency, and the application range of the utility model is as same as the application range of congener boilers.

Description

The fuel-firing gas-firing smaller hard flour pancake boiler of built-in preheating feedwater

The utility model belongs to boiler, the smaller hard flour pancake boiler of especially a kind of fuel oil or combustion gas.

Existing fuel oil or gas fired-boiler, smaller hard flour pancake boiler wherein be mainly by burner, flue, and shell, smoke box, the wing shape fin that is provided with in the smoke chamber between cigarette shell and shell and cigarette shell, feed pipe, main steam pipe is formed.Normal-temperature water is sent in the boiler with after the saturated stove water of high temperature mixes, and the temperature of whole stove water is near saturation temperature, and employing wing shape fin recovery flue gas heat still is not enough to exhaust gas temperature is reduced to below 250 ℃.Utilize external " economizer " and help reducing exhaust gas temperature though absorb the mode of waste heat, improve the thermal efficiency of boiler, the equipment globality is poor, takes up an area of greatly the cost height.

The purpose of this utility model is to propose a kind of novel, has built-in fuel oil, the combustion gas smaller hard flour pancake boiler that heat is given water function and structure that give.

The utility model is used based on the principle that the convection heat transfer' heat-transfer by convection amount is proportional to the temperature difference between flue gas and the working-medium water.

The fuel-firing gas-firing smaller hard flour pancake boiler of built-in preheating feedwater of the present utility model, mainly comprise burner, flue, shell, end socket, smoke box, cigarette shell and fin, it is characterized in that being provided with in the pot water cavity between boiler furnace flue and the shell spacer of the annular of a up/down perforation, the upper outside of said spacer is provided with the annular feed trough of a top end opening, the external feed pipe of feed trough.

In the flue of said fin between the straight wall of shell and cigarette shell, being welded in shell outer wall fin is leg-of-mutton arrangement mode setting by the flue cross section.

After according to the utility model annular spacer being set, the normal-temperature water that the process feed pipe enters annular feed trough, in annular groove, flow rapidly, evenly drop down additional the flowing in place that has saturation temperature water from the bottom of pot water cavity B to the spacer inner ring down from top circle mouthful overflow simultaneously, in its continuous supply process, the water temperature at the position, outer ring of close annular feedwater hopper is lower, compare with the high temperature in the cigarette shell flue, form the comparatively temperature difference of great disparity, on the shell of this section, become a convection heating surface, the temperature difference of the temperature difference on this heating surface when not adding spacer improves 30-40%, therefore in view of the above the fuel-firing gas-firing smaller hard flour pancake boiler of design to have a volume little, the steel consumption is low, the characteristics that the thermal efficiency is high.The effect of this built-in spacer preheating feedwater and the pre-heat effect of external " economizer " are mutually seemingly.Add that in addition fin changes the triangle mode into and is provided with, heating surface is compared with original pitch modes such as radiant type, double, and the flue gas heat recovering effect further improves, and makes above-mentioned characteristics more obvious.

Be illustrated below in conjunction with embodiment and accompanying drawing thereof.

Fig. 1 is the example structure schematic diagram of vertical boiler.

Fig. 2 is the example structure schematic diagram of horizontal boiler.

Fig. 3 is the partial schematic diagram of Fig. 1 vertical boiler.

Fig. 4 is the partial cutaway schematic of Fig. 2.

Fig. 5 is the pitch fin arrangement architecture figure such as radiant type of prior art.

Fig. 6 is triangular fin arrangement architecture figure.

Fig. 7 is combined type fin arrangement architecture figure.

Referring to accompanying drawing:

Fig. 1 is the typical structure principle chart of the utility model.The basic structure content of having represented vertical boiler among the figure.Burner 11 is used for fuel injected or fuel gas and combustion air, burns among the burner hearth A of fuel in flue 2, and heat is passed to the pot water among the pot water cavity B between flue 2 and the shell 3, makes it heating or produces steam.Combustion product gases turns back down to smoke box 9 and enters the flue C that is surrounded by shell 3 and cigarette shell 5, be provided with the fin 6 that absorbs the conduction flue gas heat therebetween along circumferential array, fin 6 is vertically arranged, be welded on the outer wall of shell, the arrangement of fin has pitch mode, triangle mode, combined types etc. such as radiant type multiple.Among the figure the 1, the 8th, end socket, the 10th, outlet flue, 12 is steam (vapor) outlet, the 4th, feed pipe, the admission port is inserted in the feed trough of top of spacer 7.Spacer 7 is the annular jacket casing of up/down perforation, and pot limit waterborne enclosure is become two annular regions, and the outside of spacer 7 epimeres is provided with an annular feed trough.In boiler continuous operation process, continuous and quantitative injects the normal temperature working-medium water in the feed trough, water level rises during injection, the spill-over of feed trough water goes out, along circumferentially flowing from top to bottom from shell one side equably, the feedwater of normal temperature forms a temperature than the obvious low annular water at low temperature band of the inboard higher saturation temperature pot water of spacer when flowing, its direct adjoining with flue gas discharge section, contact, flue gas heat in the flue is passed to heat the overflow water that flows downward with the shortest distance, utilize temperature difference preheating feedwater thereby reach, improve the effect of the thermal efficiency.

Fig. 2 is the embodiment of horizontal boiler.Because shell is horizontal, its concrete condition and vertical boiler be difference slightly, and the setting of its spacer is carried out in the following manner.At first the port with spacer changes level into, and it is D that the saturation temperature district is set then ₁, the transition temperature district is D ₂Spacer 7 outsides, i.e. D ₁, D ₂Forming feedwater district outside the chamber, with flue temperature a tangible temperature difference being arranged because temperature is low, pot water absorb heat that the cigarette shell transmits through the high liter waterborne of preheat temperature, enter D ₂The chamber adds to D by the part that is communicated with below ₁The chamber is heated into steam.The feature of all the other structures is similar to vertical boiler.

The section of Fig. 3 shows that spacer 7 is arranged in a pot water cavity B, is divided into two zones, accompanies annular feed trough in the outside zone, and the C chamber between shell and cigarette shell is the flue chamber, and fin is arranged for the triangle mode.

The flue at furnace chamber A place biasing in the horizontal boiler cross section part section of Fig. 4 correspondence, boiler, pot water cavity B spacer 7 is for the top is provided with connected entrance, and the water surface is shown in dotted line, is vaporium above the B chamber, and other has outlet.Guide rib in the smoke chamber C is a triangular structure, can be less if do not establish fin more than the waterline position.

Fig. 5 Fig. 6 Fig. 7 has provided the different structure mode of heat transfer fin respectively.Fig. 5 is the pitch rib structures such as radiant type of prior art, and it is not high that corresponding flue gas reclaims heat.The fin that shown in Figure 6 is after improving is laid mode.Its fin vertically is provided with along the shell axis, flue cross section structure triangular in shape.Its heating surface area doubles than the structure of Fig. 5.Embodiment shown in Figure 7, its rib structure are the combined type triangular structure.

The utility model doubles the smoke convection heating surface according to the rib structure design of triangle flue; After adopting spacer structure, cold section heat transfer temperature difference improves 30%-40%, and exhaust gas temperature can drop to 230 °-240 ° for this reason, and boiler thermal output is estimated to reach 87%-88%.

Claims

1, a kind of fuel-firing gas-firing smaller hard flour pancake boiler of built-in preheating feedwater, mainly comprise burner (11), flue (2), shell (3), end socket (1,8), smoke box (9), cigarette shell (5) and fin (6), it is characterized in that being provided with in the pot water cavity between boiler bladder (2) and the shell (3) spacer (7) of the annular of a up/down perforation, the upper outside of said spacer (7) is provided with the annular feed trough of a top end opening, the external feed pipe of feed trough (4).

2, the fuel-firing gas-firing smaller hard flour pancake boiler of built-in preheating feedwater as claimed in claim 1, it is characterized in that in the flue of said fin (6) between the straight wall of shell and cigarette shell, be welded in the shell outer wall, fin is leg-of-mutton arrangement mode setting by the flue cross section.