CN102345635B

CN102345635B - Energy-saving circulating fluidized bed boiler fan series model

Info

Publication number: CN102345635B
Application number: CN201010243449.2A
Authority: CN
Inventors: 梁德春; 朱之墀; 陈凤义; 李嵩; 刘沪红; 朱艳丽; 王延
Original assignee: SHENYANG BLOWER RESEARCH INSTITUTE CO LTD
Current assignee: SHENYANG BLOWER RESEARCH INSTITUTE CO LTD
Priority date: 2010-08-03
Filing date: 2010-08-03
Publication date: 2014-04-02
Anticipated expiration: 2030-08-03
Also published as: CN102345635A

Abstract

An energy-saving circulating fluidized bed boiler fan series model comprises a housing, an impeller and an air inlet. The impeller comprises sixteen backward plate-like blades, a cambered impeller cover, a flat impeller disk and an impeller hub. The sixteen backward plate-like blades are circumferentially and evenly distributed, and are welded between the cambered impeller cover and the flat impeller disk, which are mounted on the impeller hub. The housing and the air inlet are of welded structures, and the profile of the air inlet is shaped like a conical arc which is axially converged. The outlet diameter of the blades of the impeller (2) is 800mm, the inlet diameter is 407mm, the width is 154.6mm, the outlet width is 93mm, the outlet angle of the blades is 44 degrees, the diameter of the air inlet (3) is 495mm, and the width of the air inlet (3) is 134mm. The model has the advantages of high efficiency, low noise, long service life and wide application range.

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 6-35 type circulating fluidized bed boiler energy-saving fan serial model.

Background technique

Along with the high speed development of national economy, the quickening of modernization construction, increases sharply to the demand of all kinds blower fan.But at present existing some blower fan series exists volume large, and fan performance is not good, and efficiency is low, the shortcoming such as consume energy large.

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.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, 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, plans and develops four blower fan series models.By the time of 5 years, Tsing-Hua University's fluid the complete machine complex flowfield of multiple design proposal is carried out to 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, completed this project.Four blower fan series models have all reached re-set target.

Summary of the invention

Object of the present invention, is to provide a kind of circulating fluidized bed boiler energy-saving fan model, is one of above-mentioned four blower fan series models, and trade name is 6-35 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.

Described impeller is comprised of the wheel cap of 16 backward plate blades, arc, plate shaped wheel disc and wheel hub.16 backward plate blades are along circumferentially uniform, and are welded between the wheel cap and plate shaped wheel disc of arc, 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.

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 middle small flow, Intermediate High Pressure category, and the highest fan efficiency is 85.03%.With the blower fan of this modeling design, can be used as 35-410 ton/time circulating fluidized bed boiler primary air fan, overfire air fan and high-head induced draught fan and dedusting fan, gas-blowing engine, coal dust ventilator, main exhauster of sintering etc.In Fan Selection, show its advantage that performance is good, efficiency is high.And can replace the most of operating point of 6-31 being widely applied in fields such as power station, metallurgy for many years, can also be for meeting above purposes, in 6-31 flow system bigger than normal.

Type selecting advantage:

Give an example 1: certain circulating fluidized bed boiler fan design parameter: Pa=101325Pa; ρ=1.2kg/m3

Flow=92853 (m3/h); Total head=6735Pa; Type selecting: existing optional 6-35No19.2D (n=980r/min), table 1 has provided 6-35No19.2D and 6-31No20D has the comparison of dimension performance.

Table 1

Meet as seen from Table 1 same flow and pressure, select 6-35No19.2D higher by 6.4% than selecting 6-31No20D impeller adiabatic efficiency, impeller power declines 5%.And plane No. reduces, not only can save material, reduce costs.Can also subtract trochantinian GD ^2,, reduce rotor critical speed, extend bearing life, increase impeller intensity.

Give an example 2: be three change sample 9-26No14D below; N=1450r/min; Certain operating point parameter during ρ=1.2kg/m3:

Flow=70682 (m3/h); Total head=11099Pa; Impeller adiabatic efficiency (internal efficiency)=76%;

Impeller power (internal power)=276.16kw meets same parameter, if select the 6-35No16D can be energy-efficient.

Table 2 has provided under same rotating speed and import density, the performance comparison result of 6-35No16D and 9-26No14D.

Table 2

Meet as seen from Table 2 same flow and pressure, select 6-35No16D higher by 11.8% than selecting 9-26No14D impeller adiabatic efficiency, impeller power declines 10.4%.

It is vaneless diffuser that 9-26 draught fan impeller has diffuser, and impeller outlet diameter is 1.15 times of blade exit diameter.Table 3 has provided 6-35No16D impeller and the comparison of 9-26No14D impeller relative dimensions:

Table 3

	9-26No14D	6-35No16D	Deviate (mm)
				Blade exit diameter (mm)	1400	1600	+200
Impeller outer diameter (mm)	1610	1610	0
				Impeller width (mm)	358.4	309.2	-49.2
Blade exit width (mm)	210	186.1	-23.9
				The number of blade	16	16	0
Fan outlet and inlet-duct area ratio	0.637	0.685	+7.5％

6-35No16D compares with 9-26No14D as seen from Table 3, and impeller outer diameter equates; Impeller width is narrow, and fan outlet and inlet-duct area ratio mean that greatly the dynamic pressure of the poor 9-26No14D of being less than of dynamic pressure of 6-35No16D is poor,, meet same differential static pressure, select 6-35 can select less plane No. than existing 9-26.9-26 belongs to forward direction blower fan in addition, curve is steeper, the large easy overpower of flow.6-35 belongs to backward blower fan, smoother, the difficult overload of curve.Especially for the larger occasion of dust loading, because 6-35 is by numerical simulation calculation is carried out in impeller interior three-dimensional flow field, optimize flow passage component size, the realistic air current flow direction of determined inlet blade angle, blade import wearing and tearing are minimum.And 9-26 is forward direction blower fan, the occasion that inapplicable dust loading is larger, 6-35 has solved the blade import wear problem of the blower fan existence of the types such as 6-31,9-26, can extend the working life of impeller, and this is a large advantage undoubtedly to participating in market competition.

Tool of the present invention has the following advantages:

1, of many uses.

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.

Accompanying drawing explanation

Fig. 1 is a kind of structural representation 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 zero dimensional performance curve figure of the present invention.Wherein Ф 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 serial model, comprises casing 1, impeller 2, intake grill 3 and transmission group 4.

Described impeller is comprised of the wheel cap 6 of 16 backward plate blades 5, arc, plate shaped wheel disc 7 and wheel hub 8.16 backward plate blades 5 are along circumferentially uniform, and are welded between the wheel cap 6 and plate shaped wheel disc 7 of arc, are assembled with wheel hub 8.

Flow passage component major character:

The blade exit diameter of impeller 2 is 800mm, and inlet diameter is 407mm, and width is 154.6mm, and exit width is 93mm, and blade outlet angle is 44 °.

Described intake grill 3 diameters are that 495mm, width are 134mm.

Described casing 1 width is 232.5mm, and casing export center is 597.2mm to casing center, and casing outlet is 566.7mm * 232.5mm.

Described zero dimensional performance curve and parameter attribute: flow coefficient 0.0807, pressure coefficient 0.5944, power factor 0.0587, fan efficiency 85.03%;

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. circulating fluidized bed boiler energy-saving fan, comprises casing (1), impeller (2), intake grill (3); Described impeller is comprised of 16 backward plate blades (5), arc wheel cap (6), plate shaped wheel disc (7) and wheel hub (8), 16 backward plate blades (5) are along circumferentially uniform, and be welded between the wheel cap (6) and plate shaped wheel disc (7) of arc, be assembled with wheel hub (8), the volute body that casing (1) is welded for sheet material; Intake grill is welded structure, its molded line is the cone arc of restraining vertically, it is characterized in that described impeller (2): blade (5) outlet diameter is that 800mm, inlet diameter are that 407mm, width are that 154.6mm, exit width are that 93mm, blade outlet angle are 44 °;

The inlet diameter of described intake grill (3) is that 495mm, width are 134mm;

Described casing (1) width is that 232.5mm, casing export center are that 597.2mm, casing outlet are 566.7mm * 232.5mm to casing center.