CN201827143U

CN201827143U - Circulating fluidized bed boiler energy-saving fan serial model

Info

Publication number: CN201827143U
Application number: CN2010202799764U
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: 2011-05-11
Anticipated expiration: 2020-08-03

Abstract

A circulating fluidized bed boiler energy-saving fan serial model comprises a casing, an impeller and an air inlet, wherein the impeller consists of 16 rearward plate type blades, an arc impeller cover, a flat plate type impeller disc and a hub, the 16 rearward plate type blades are uniformly distributed along the peripheral direction and welded between the arc impeller cover and the flat plate type impeller disc, and the blades are fitted to the hub. The casing and the air inlet are in welded structures, profiles of the casing and the air inlet are in axially reduced conical arc shapes, and the blade 2 has an 800mm blade outlet diameter, a 407mm inlet diameter, a 154.6mm width, a 93mm outlet width and a 44-degree blade outlet angle. The air inlet 3 has a 495mm diameter and a 134mm width. The circulating fluidized bed boiler energy-saving fan serial model is high in efficiency, low in noise, long in service life and wide in application range.

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 a kind of 6-35 type circulating fluidized bed boiler energy-saving fan series model.

Background technique

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

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 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 a 6-35 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 the wheel cap of template blade, arc, plate shaped wheel disc and wheel hub after 16.After 16 to the template blade along circumferentially uniform, and be welded between the wheel cap and plate shaped wheel disc of arc, 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 group comprises main shaft, bearing housing etc., is known technology.

Purposes of the present utility model:

Blower fan series model of the present utility model belongs to middle small flow, the Intermediate High Pressure category, and the highest fan efficiency is 85.03%.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, sintering main exhauster etc. with the blower fan of this modeling design.In Fan Selection, show its advantage that performance is good, efficient is high.And can replace having obtained in fields such as power station, metallurgy for many years the most of operating point of 6-31 of extensive use, can also be used to satisfy above purposes, in 6-31 flow system bigger than normal.

The 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 have provided 6-35No19.2D and 6-31No20D has the dimension performance relatively.

Table 1

Satisfy same flow and pressure as seen from Table 1, it is higher by 6.4% than selecting the 6-31No20D impeller adiabatic efficiency to select 6-35No19.2D, and impeller power descends 5%.And plane No. reduces, and not only can save material, reduces cost.Can also reduce the GD of rotor ^2,, reduce rotor critical speed, prolong bearing life, increase impeller intensity.

For example 2: below be three to change sample 9-26No14D; 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 satisfies same parameter, if select for use the 6-35No16D can be energy-efficient.

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

Table 2

Satisfy same flow and pressure as seen from Table 2, it is higher by 11.8% than selecting the 9-26No14D impeller adiabatic efficiency to select 6-35No16D, and impeller power descends 10.4%.

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

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?
				Blower 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; The impeller width is narrow, and the blower fan outlet means greatly that with inlet-duct area ratio the dynamic pressure difference of 6-35No16D is poor less than the dynamic pressure of 9-26No14D,, satisfy same differential static pressure, select 6-35 can select littler plane No. than existing 9-26.9-26 belongs to the forward direction blower fan in addition, curve ratio is steeper, the big easy overpower of flow.6-35 belongs to the back to blower fan, smoother, the difficult overload of curve.Especially for the bigger occasion of dust loading, because 6-35 is by numerical simulation calculation being carried out in impeller interior three-dimensional flow field, optimize the flow passage component size, the realistic air current flow direction of determined inlet blade angle, blade import wearing and tearing minimum.And 9-26 is the forward direction blower fan, the occasion that inapplicable dust loading is bigger, and 6-35 has solved the blade import wear problem of the blower fan existence of types such as 6-31,9-26, can prolong the working life of impeller, and this is a big advantage undoubtedly to participating in market competition.

The utlity model has following advantage:

1, of many uses.

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 a kind of structural representation of the present utility model.

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 (№ 8 models) comprises casing 1, impeller 2, intake grill 3 and transmission group 4.

Described impeller is formed to the wheel cap 6 of template blade 5, arc, plate shaped wheel disc 7 and wheel hub 8 after 16.After 16 to template blade 5 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 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 the casing export center is 597.2mm to the casing center, and the 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 amplify on year-on-year basis or dwindle and make series product, all within protection.

Claims

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

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) edge, 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 (3) 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 is characterized in that described impeller (2): the blade exit 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 the casing center.