CN102345636B - Energy-saving circulating fluidized bed boiler fan series model - Google Patents

Abstract

An energy-saving circulating fluidized bed boiler fan series model comprises a housing, an impeller, an air inlet and a drive set, and is characterized in that the impeller comprises twelve blades, an impeller cover, an impeller disk and an impeller hub. The twelve backward plate-like blades are circumferentially and evenly distributed, and are welded between the conical arc-shaped impeller cover and the flat impeller disk, which are mounted on the impeller hub. The housing is a volute formed by welded plates. The air inlet is of a welded structure, and the profile of the air inlet is shaped like a conical arc which is axially converged. An oblique cone type deflected air inlet plus an air intake box can be mounted at the position of the air inlet. The air intake box is a part which transforms radial air flow into axial air flow, the air inlet is the oblique cone type deflected air inlet, and both the air intake box and the air inlet are of steel plate-welded structures. The model has the advantages of wide application range, high efficiency, energy saving, wide efficiency range and low noise. The dynamic pressure difference between the inlet and the outlet is small, and the model number can be reduced. The difference between the performance of the F type and the performance of the D type is little, and the model is an ideal model in the low-flow, medium-high pressure category.

Description

Circulating fluidized bed boiler energy-saving fan serial model

Technical field

The present invention relates to a kind of blower fan, specifically relate to a kind of 6-24 type circulating fluidized bed boiler energy-saving fan serial model.

Background technique

The blower fan great majority that domestic market is sold are products of the 60 to 70's exploitation, as series product such as 4-73,4-72,9-19,9-26,5-48,6-48, T4-72, also in every field, apply widely so far.Some enterprises are by combining with universities and colleges or introduction and some new products of independent development still can not meet growing market demand far away in recent years, for the fan performance level in some field, also have very large potentiality to dig.Severe competition model in the face of blower fan market, only improves constantly blower fan technical merit, just can be competitive.And the aeroperformance of the blower fan most important constituent element that is it.One Fans structure is good again, appearance quality is good again, if performance does not reach user's requirement, can cause very large economic loss to user, because of blower fan quality problems, to entrust mechanical industry Fan Product quality supervision inspection center to carry out the case of technology ruling a lot of in recent years, and problem much all goes out aspect aeroperformance.In Selection and Design process, in order to meet user's performance parameter, manufactory selects less than suitable blower fan type in existing sample, and certain model blower fan is improved, and is not hundred-percent sure again in addition.Because type selecting is improper, when blower fan turns round at the scene, need only pipe network and slightly change blower fan with regard to surge.Although the flow pressure of blower fan can be chosen sometimes, due to not in efficient district, or original peak efficiency was just not high, selected power of motor very large, cannot compete with other competitive bidding units, so just lost the chance of competitive bidding.

For meeting the demand of the fast development of China's economy to blower fan, improve the technical merit of Fan Product, implement national information portion about the eliminating of outmoded products progressively, promote new product spirit.Shenyang Blower research institute is with the fan design of internal class and the advantage of experimental study ability, in March, 2005, set up the project, blower fan series type spectrum for existing most manufacturer production, in line with plugging a gap, take energy-efficient, it is target, and the principle that replaces as far as possible broad-spectrum other series product, develops this blower fan series model.By the time of 5 years, Shenyang Blower research institute was through manufacturing and designing, and carried out test of many times research, completed this project.This blower fan series model has reached re-set target.

Summary of the invention

Object of the present invention, is to provide circulating fluidized bed boiler energy-saving fan serial model, and trade name is 6-24 circulating fluidized bed boiler energy-saving fan serial model.

The technological scheme adopting is:

Circulating fluidized bed boiler energy-saving fan serial model, comprises casing, impeller, intake grill and transmission group, it is characterized in that: described impeller is comprised of 12 backward plate blades, cone arc wheel cap, plate shaped wheel disc and wheel hub.12 backward plate blades edges are circumferentially uniform, and are welded between cone arc wheel cap and plate shaped wheel disc, are assembled with wheel hub.Casing is the volute body that sheet material is welded, and intake grill is welded structure, and its molded line is the cone arc of restraining vertically.

At above-mentioned intake grill place, can install the inclined to one side intake grill+inlet box of oblique conic.Described inlet box is air-flow to be changed into the parts of axial flow by Radial Flow, the inclined to one side intake grill that intake grill is oblique conic, and inlet box and intake grill are welded-steel plate construction.

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

Purposes of the present invention:

Blower fan series model of the present invention belongs to small flow, mesohigh category.While not being with inlet box, the highest fan efficiency is 82.3%.During band inlet box, the highest fan efficiency is 79.39%.The blower fan serial fan designing with this modeling is applicable to 35-410 ton/time circulating fluidized bed boiler primary air fan, overfire air fan and high-head induced draught fan, high pressure forced ventilation, gas-blowing engine, main exhauster of sintering etc.

Because product line designs by modeling, so any plane No. product of flow passage component design is all within protection, can zoom in or out on year-on-year basis and make series product by described impeller, suction port, casing size.Type selecting advantage

A, performance advantage

Give an example 1: certain circulating fluidized bed boiler fan design parameter: Pa=101325Pa; ρ=1.2kg/m3 flow=46345 (m3/h); Total head=7484Pa;

Selecting type scheme 1: if there is no 6-24 series model, meet above parameter and can only select 7-16No 10.6D (n=2980r/min)

Selecting type scheme 2: had now 6-24 series model, at certain non dimensional curve section (former blank) optional 6-24No10D (n=2980r/min) herein.

Table 1 has provided under same rotating speed and import density, the performance comparison result of 6-24No10D and 7-16No10.6D.

Table 1

As seen from Table 1, for meeting design parameter, as select 7-16No10.6D, internal efficiency is 65%, and select 6-24No10D impeller adiabatic efficiency, is 82.3%, and impeller adiabatic efficiency can improve 26.6%, and impeller power can reduce by 21%, can significantly save the energy.And plane No. is little, can material-saving, reduce costs.The exit port Area Ratio of 6-24 blower fan is that the exit port Area Ratio of 0.64,7-16 blower fan is 0.47 in addition, same with described in front, and for meeting same differential static pressure, 6-24 can reduce plane No..

B, F formula are compared performance with D formula and are differed little

For small flow blower fan, at same flow point, fan design is F formula than D formula pressure and a lot of problems of decrease in efficiency (general pressure and decrease in efficiency 8% left and right), we to 6-24No8 model design F formula structure, be with inlet box, radial air inlet.Table 2 has provided F formula and the D formula zero dimension performance comparison of 7 operating points.

Table 2

7 operating point F formulas are compared with D formula as seen from Table 2, and pressure is maximum declines 2.3%, and impeller adiabatic efficiency is maximum declines 4.9%.Changed small flow blower fan, when F formula (radial air inlet), because impeller inlet flow field is inhomogeneous and the obstruction of axle to inlet air flow, the situation that pressure and decrease in efficiency are a lot.

Tool of the present invention has the following advantages

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

2, impeller is backward plate blade, so motor is difficult for overload.

3, energy-efficient, efficient district is wide, noise is low.

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

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

6, easy to process.

7, F formula performance and D formula performance differ little.

It is the ideal model of small flow, mesohigh category.

Accompanying drawing explanation

Fig. 1 is a kind of example structure schematic diagram of the present invention.

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

Fig. 3 is blade wheel structure schematic diagram.

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

Fig. 5 is the blower fan model structure schematic diagram that is equiped with inlet box.

Fig. 6 is 6-24 Fan for Circulating Fluidized Bed Boiler No8 model zero dimensional performance curve figure, and wherein Ф is that flow coefficient, Ψ are that coefficient of total pressure, λ are power factor, η r impeller adiabatic efficiency.

Embodiment

Embodiment one

Circulating fluidized bed boiler energy-saving fan serial model, for not being with inlet box type (D formula), comprises casing 1, impeller 2, intake grill 3 and transmission group 4, and transmission group 4 comprises main shaft, bearing housing etc., is known technology.It is characterized in that: described impeller is comprised of 12 backward plate blades 5, cone arc wheel cap 6, plate shaped wheel disc 7 and wheel hub 8.12 backward plate blades edges are circumferentially uniform, and are welded between cone arc wheel cap 6 and plate shaped wheel disc 7, are assembled with wheel hub 8.The volute body 1 that casing 1 is welded for sheet material, intake grill 3 is welded structure, its molded line is the cone arc of restraining vertically.

Embodiment two

Circulating fluidized bed boiler energy-saving fan serial model, for band inlet box type (F formula), comprises casing 1, impeller 2, intake grill 3, inlet box 9 and transmission group 4.Impeller 1 and casing 2, transmission group 4 are structurally identical when not being with inlet box.Its inlet box is air-flow to be changed into the parts of axial flow by Radial Flow, the inclined to one side intake grill that intake grill is oblique conic, and inlet box 9 and intake grill 3 are welded-steel plate construction.

Flow passage component major character:

(1) impeller

Blade exit diameter is that 800mm, inlet diameter are that 340mm, width are that 108mm, exit width are that 37mm, blade outlet angle are 50 °.

(2) intake grill

While not being with inlet box, inlet diameter is that 400mm, width are 260mm.

During band inlet box, inlet diameter is that 490mm, width are that between 155mm, import and export axis, distance is 91mm.

(3) casing

Width 183mm, casing export center are that 540.3mm, casing outlet are 438.8mmX183mm to casing center.

(4) inlet box

Inletpiston is 584mm to outlet axial line distance.Import is 608mmX256mm.

Zero dimensional performance curve and parameter attribute: while not being with inlet box, flow coefficient 0.0396, pressure coefficient 0.5466, power factor 0.0263, fan efficiency 82.3%; During band inlet box, flow coefficient 0.0396, pressure coefficient 0.5431, power factor 0.0271, fan efficiency 79.39%.

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

Claims (1)

1. a circulating fluidized bed boiler energy-saving fan, comprises casing (1), impeller (2), intake grill (3); Described impeller is comprised of 12 backward plate vanes (5), cone arc wheel cap (6), plate shaped wheel disc (7) and wheel hub (8), 12 backward plate blades (5) are along circumferentially uniform, and be welded between cone arc wheel cap (6) and plate shaped wheel disc (7), be assembled with wheel hub (8), the volute body of casing (1) for being welded by sheet material, intake grill (3) is welded structure, in intake grill (3) outer end, is equiped with inlet box (9) or is not with inlet box (9); When intake grill (3) outer end is equiped with inlet box (9), the inclined to one side intake grill that intake grill (3) is oblique conic; When inlet box is not installed in intake grill (3) outer end, the molded line of intake grill (3) is the cone arc of restraining vertically, it is characterized in that:

1) impeller

Blade exit diameter is that 800mm, inlet diameter are that 340mm, width are that 108mm, exit width are that 37mm, blade outlet angle are 50 °;

2) intake grill

While not being with inlet box, inlet diameter is that 400mm, width are 260mm;

During band inlet box, inlet diameter is that 490mm, width are that between 155mm, import and export axis, distance is 91mm;

3) casing

Width 183mm, casing export center are that 540.3mm, casing outlet are 438.8mmX183mm to casing center.

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