CN201818545U - Energy-saving fan model of circulating fluidized bed boiler - Google Patents

Abstract

The utility model relates to an energy-saving fan model of a circulating fluidized bed boiler, comprising a case, an impeller, an air inlet and a transmission group, wherein the impeller consists of 16 blades, a wheel cover, a wheel disc and a hub. The 16 backward plate-shaped blades are uniformly distributed along the circumference and welded between the arc-shaped wheel cover and the flat-plate-shaped wheel disc and are assembled together with the hub. A mold line of the air inlet is shaped like a conical arc shape which is converged along the axial direction. The outlet diameter of the blade is 600mm, the inlet diameter of the blade is 389mm, the width is 151.9mm, the width of the outlet is 77.5mm, an outlet angle of the blade is 68 degrees, the inlet diameter of the air inlet is 495mm, and the width is 178mm. The energy-saving fan model is wide in purpose, the impeller is provided with the backward plate-shaped blades, therefore, a motor is not easy to overload, the efficiency is high, the energy is saved, the high-efficiency area is wide, the noise is low, the dynamic pressure difference between the outlet and the inlet is less, the model number can be reduced, the wear of the inlet of the blade is less and the service life of the impeller can be prolonged.

Description

Circulating fluidized bed boiler energy-saving fan series model

Technical field

The utility model relates to a kind of blower fan, specifically relates to the ciculation fluidized boiler energy-saving blower fan of a kind of 7-28 type series model.

Background technique

The blower fan great majority of Domestic market sale at present are the 60 to 70's development product, as series product such as 4-73,4-72,9-19,9-26,5-48,6-48, T4-72, also use widely in every field so far.Some enterprises are not by still satisfying growing market demand far away with universities and colleges' associating or introduction and some new products of independent development in recent years, also have very big potentiality to dig for the fan performance level in some field.Serious competition form in the face of blower fan market only improves constantly the blower fan technical merit, just can be competitive.And the aeroperformance of blower fan is its most important component.One typhoon machine structure is good again, appearance quality is good again, if performance does not reach customer requirements, can cause very big economic loss to the user, to entrust mechanical industry blower fan product quality supervision inspection center to carry out the case of technology ruling a lot of because of the blower fan quality problems in recent years, and how problem all goes out aspect aeroperformance.In the Selection and Design process, in order to satisfy user's performance parameter, manufactory selects in existing sample less than suitable blower fan type in addition, and certain model blower fan is improved, and does not very hold again.Because type selecting is improper, needs only pipe network when blower fan turns round at the scene and change blower fan slightly with regard to surge.Although the flow pressure of blower fan can be chosen sometimes, because not in efficient district, or original peak efficiency is just not high, selects for use power of motor very big, can't compete with other competitive bidding units, so just loses the chance of competitive bidding.

For satisfying the demand of China's rapid economy development to blower fan, improve the technical merit of blower fan product, implement national information portion about the eliminating of outmoded products progressively, promote new product spirit.So advantage of the fan design software development of Shenyang Blower research institute and Tsing-Hua University's fluid internal class, application and experimental study ability, combination among the strong ones, set up the project in March, 2005, blower fan series type spectrum at existing most manufacturer production, in line with plugging a gap, being target with energy-efficient, and four blower fan series models are planned and developed to the principle that replaces broad-spectrum other series product as far as possible.By the time in 5 years, Tsing-Hua University's fluid the complete machine complex flowfield of multiple design proposal is carried out numerical simulation, fan performance is estimated and hundreds of time Pneumatic Calculation has been carried out in optimization, the manufacturing of Shenyang Blower research institute more than 30 cover blower fan models, carry out 100 test of many times researchs, finished this project.Four blower fan series models have all reached re-set target.

The model utility content

The purpose of this utility model provides circulating fluidized bed boiler energy-saving fan series model, and trade name is a 7-28 circulating fluidized bed boiler energy-saving fan series model.

The technological scheme that adopts is:

Circulating fluidized bed boiler energy-saving fan series model comprises casing, impeller, intake grill and transmission group.

Described impeller is formed to template blade, arc wheel cap, plate shaped wheel disc and wheel hub after 16.Circumferentially uniform after 16 to template blade edge, and be welded between arc wheel cap and the plate shaped wheel disc, be assembled with wheel hub.Casing is the volute body that sheet material is welded, and intake grill is a welded structure, and its molded lines is the awl of convergent vertically arc.

Described transmission device comprises main shaft, bearing housing etc., is known technology.

The utility model belongs to middle small flow, the Intermediate High Pressure category, and the highest fan efficiency is 87.07%.Blower fan with the design of this modeling can be used as steam boiler forced-and-induced draft fan, coal dust ventilator, Iron And Steel Plant's smelting dusting apparatus dedusting fan, high pressure forced ventilation.This serial blower fan is specially adapted to circulating fluidized bed boiler with primary air fan, overfire air fan and high-pressure suction fan and dedusting fan, sintering main exhauster etc.

The type selecting advantage

Give an example 1: certain circulating fluidized bed boiler fan design parameter: Pa=101325Pa; ρ=1.2kg/m3 flow=87531 (m3/h); Total head=16952Pa

Type selecting scheme 1:, satisfy above parameter and can only select 6-31No19D (n=1480r/min) if there is not the 7-28 series model

Type selecting scheme 2: the 7-28 series model has been arranged now, herein at certain non dimensional curve section (former blank) optional 7-28No 18D (n=2980r/min).

Table 1 has provided under same rotating speed and the import density, the performance comparison result of 7-28No18D and 6-31No19D.

Table 1

As seen from Table 1, for satisfying design parameter, as to select 6-31No19D, impeller adiabatic efficiency be 81%, and impeller power is 482.5kw, and select the 7-28No19D impeller adiabatic efficiency is 87%, impeller power is 449.2kw, and impeller adiabatic efficiency can improve 7.4%, and impeller power can reduce by 6.9%, (two kinds of schemes have all been chosen efficient district), but with 7-28 than saving the energy with 6-31.

For the blower fan of pressure coefficient 0.7, and impeller is narrower, and the highest internal efficiency can be very very difficult greater than 87%.Efficient is the important parameter in the fan performance parameter in technology is submitted a tender.Efficient is directly connected to the size of power demand.If the fan efficiency height, acceptance of the bid will be preponderated, in addition to have filled up pressure coefficient be a certain section performance curve blank of 0.7 to the utility model model, and has the little advantage of blade import wearing and tearing, can prolong the working life of impeller.So the utility model model is energy-efficient, and is of many uses, be a kind of very competitive, the blower fan type that has a extensive future.

Advantage of the present utility model is:

1, of many uses, filled up ventilator series type spectrum blank.

2, impeller is back to the template blade, so motor is difficult for overload.

3, energy-efficient, efficiently distinguish wide, noise is low.

4, outlet and import dynamic pressure difference are little, can reduce plane No..

5, blade import wearing and tearing are little, can prolong the working life of impeller.

6, easy to process.

Description of drawings:

Fig. 1 is an a kind of embodiment's of the present utility model structural representation.

Fig. 2 is the A-A view of Fig. 1.

Fig. 3 is the blade wheel structure schematic representation.

Fig. 4 is the right elevation of Fig. 3.

Fig. 5 is the utility model zero dimensional performance curve figure.Wherein Φ is that flow coefficient, Ψ are that coefficient of total pressure, λ are power factor, η r impeller adiabatic efficiency.

Embodiment

Circulating fluidized bed boiler energy-saving fan series model comprises casing 1, impeller 2, intake grill 3 and transmission group 4, and transmission group comprises main shaft, bearing housing etc., is known technology.

Described impeller is formed to template blade 5, arc wheel cap 6, plate shaped wheel disc 7 and wheel hub 8 after 16.Circumferentially uniform after 16 to template blade 5 edges, and be welded between arc wheel cap 6 and the plate shaped wheel disc 7, be assembled with wheel hub 8.Casing is the volute body that sheet material is welded, and intake grill 3 is a welded structure, and its molded lines is the awl of convergent vertically arc.

The outlet diameter of described impeller 2 is 880mm, and the blade exit diameter is 800mm, and inlet diameter is that 389mm, width are that 151.9mm, exit width are that 77.5mm, blade outlet angle are 68 °.

The inlet diameter of described intake grill 3 is that 495mm, width are 178mm.

The width of described casing 1 is 189mm, and the casing export center is that 577mm, casing outlet are 522mmX189mm to the casing center.

Described zero dimensional performance curve and parameter attribute: flow coefficient 0.0685; Pressure coefficient 0.6887; Power factor 0.0542; Fan efficiency 87.07%.

Because product line designs by modeling, therefore can amplify on year-on-year basis or dwindle and make series product, all within protection by the above-mentioned flow passage component size of impeller, intake grill and casing.

Claims (2)

1. circulating fluidized bed boiler energy-saving fan series model comprises casing (1), impeller (2), intake grill (3); It is characterized in that:

Described impeller (2) is formed to template blade (5), arc wheel cap (6), plate shaped wheel disc (7) and wheel hub (8) after 16, circumferentially uniform after 16 to template blade (5) edge, and be welded between arc wheel cap (6) and the plate shaped wheel disc (7), be assembled with wheel hub (8), the volute body that casing (1) is welded for sheet material, intake grill is a welded structure, and its molded lines is the awl of convergent vertically arc.

2. circulating fluidized bed boiler energy-saving fan series model according to claim 1, the outlet diameter that it is characterized in that described impeller (2) is 880mm, the blade exit diameter is 800mm, and inlet diameter is that 389mm, width are that 151.9mm, exit width are that 77.5mm, blade (5) exit angle are 68 °;

The inlet diameter of intake grill (3) is that 495mm, width are 178mm;

The width of casing (1) is 189mm, and the casing export center is that 577mm, casing (1) outlet are 522mmX189mm to casing (1) center.

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