CN103807187A

CN103807187A - Centrifugal high-pressure fluidization fan for 135 MW circulating fluidized bed

Info

Publication number: CN103807187A
Application number: CN201410085115.5A
Authority: CN
Inventors: 陈勇
Original assignee: Nantong Dart Pollrich Fan Co Ltd
Current assignee: Nantong Dart Pollrich Fan Co Ltd
Priority date: 2014-03-10
Filing date: 2014-03-10
Publication date: 2014-05-21
Anticipated expiration: 2034-03-10
Also published as: CN103807187B

Abstract

The invention discloses a centrifugal high-pressure fluidization fan for a 135 MW circulating fluidized bed. The centrifugal high-pressure fluidization fan comprises a bracket, a centrifugal fan body, an inlet mechanism and an outlet mechanism, wherein the centrifugal fan body is fixed on the bracket; the inlet mechanism and the outlet mechanism are connected with the centrifugal fan body; the inlet mechanism comprises an inlet silencer, a first pipeline, an inlet butterfly valve, a second pipeline and an inlet expansion joint, connected in sequence; the outlet mechanism comprises an outlet check valve, a third pipeline, an outlet butterfly valve, a fourth pipeline and an outlet expansion joint, which are connected in sequence; the centrifugal fan body comprises supporting bearing pedestals, rotors, thrust bearing pedestals, a coupling and a motor in sequence; stators are embedded on the rotors. The centrifugal high-pressure fluidization fan, disclosed by the invention, has the advantages that manufacturing is simple, the efficiency loss is low, the energy is saved, the operation is stable, the noise is small, and the vibration as well as the maintaining cost is low.

Description

The centrifugal hp fluid air machine of a kind of 135MW recirculating fluidized bed

Technical field

The present invention relates to a kind of fluidized air blower, relate in particular to the centrifugal hp fluid air machine of a kind of 135 MW recirculating fluidized bed.

Background technique

Substantially supporting employing Roots blower in 135MW Properties of CFB hp fluid air machine industry, with the comparison of 300MW unit, 135MW generating capacity is the half of 300MW unit, and 135MW unit volume is less, flow parameter is less, and the parameter of supporting boiler is less.

But Roots blower is that a kind of low pressure exhaust air rate is larger, the blower fan that efficiency is lower, its flow changes with blast hardly, and flow is subject to the impact of pipe resistance hardly, as long as rotating speed remains unchanged, flow is also just substantially constant, is commonly called as " hard wind ", is not suitable for variable working condition requirement, and its noise is larger, and have infrasonic wave, operational shock is large, and maintenance cost is higher.

Compared with Roots blower, centrifugal blower is stable, it is little to vibrate, noise is low, variable working condition, maintenance cost are cheap, but 135MW Properties of CFB boiler parameter is less, particularly flow is less, blower fan inlet and outlet pressure is more higher than again, and the current applicable centrifugal blower that do not have meets this unit demand.

Summary of the invention

Goal of the invention: in order to solve the deficiencies in the prior art, the invention provides the centrifugal hp fluid air machine of a kind of 135MW recirculating fluidized bed, the Multi-stage centrifugal fan that it adopts uses the super narrow leaf wheel of runner, thereby realizes extra small flow.

The object of the invention is to realize by such technological scheme, the centrifugal hp fluid air machine of a kind of 135MW recirculating fluidized bed, comprise support, be fixed on the centrifugal blower body on described support, connect import mechanism and the exit mechanism of described centrifugal blower body, described import mechanism comprises the import baffler connecting successively, the first pipeline, import butterfly valve, second pipe and import expansion joint, described exit mechanism comprises the outlet non-return valve connecting successively, the 3rd pipeline, exit butterfly valve, the 4th pipeline and outlet expansion joint, described centrifugal blower body comprises supporting bearing base successively, rotor, thrust shaft block, coupling and motor, on described rotor, be nested with stator, described stator comprises air inlet volute, plural number dividing plate and exhaust volute, between described dividing plate, form runner, described rotor comprises main shaft, be fixed on the round nut on described main shaft, plural number axle sleeve, plural number impeller and Balance disc, the exit width of described impeller is 8mm.

Described the 4th pipeline is also connected with outlet bypass valve and outlet bypass baffler.

Described coupling outside is provided with coupling guard.

Described coupling is diaphragm coupling.

Described exhaust volute sidewall is provided with reflow pipe and is connected with described main shaft, to be communicated with blower fan import and outlet.

Described dividing plate upper end is provided with transition arc.

Compared with prior art, the disclosed centrifugal hp fluid air machine of a kind of 135MW recirculating fluidized bed, adopt multistage centrifugal blower, adopt 6 impellers, it has, and flow is little, efficiency is high, manufacture is simple, loss in efficiency is little, energy-conservation, stable, noise is little, vibrate the advantages such as low, maintenance cost is low, and analyzes and actual performance is tested its performance and reached 78% by CFD.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is the structural representation of stator of the present invention;

Fig. 3 is the structural representation of rotor of the present invention.

Embodiment

Below in conjunction with accompanying drawing of the present invention, the technological scheme of the embodiment of the present invention is carried out to clear, complete description.

As shown in Fig. 1 ~ 3, the disclosed centrifugal hp fluid air machine of a kind of 135MW recirculating fluidized bed, comprise support 1, centrifugal blower body 2, import mechanism 3 and exit mechanism 4, wherein said centrifugal blower body 2 is fixed on concrete pedestal by described support 1, and described import mechanism 3 connects the intake grill of described centrifugal blower body 2, and described exit mechanism 4 connects the exhaust outlet of described centrifugal blower body 2.

Particularly, described import mechanism 3 comprises the import baffler 31 connecting successively, the first pipeline 32, import butterfly valve 33, second pipe 34 and import expansion joint 35, described import butterfly valve 33, for changing fan condition, is convenient to the change of flow, described import expansion joint 35 is fixedly connected with the import of described centrifugal blower body 2 by flange, and absorbing vibration damping is to reduce the impact of system pipeline to blower fan.

Described exit mechanism 4 comprises the outlet non-return valve 41 connecting successively, the 3rd pipeline 42, exit butterfly valve 43, the 4th pipeline 44 and outlet expansion joint 45, wherein said outlet non-return valve 41 is for preventing gas backstreaming air inlet fan, cause blower fan rotation, described the 4th pipeline 44 sides are also connected with outlet bypass valve 46, make fan outlet in the situation that of surge, a part of pressure, by 46 emptying of outlet bypass valve, is reduced to system pressure, avoided surge region, export bypass valve 46 connection outlet bypass bafflers 47 simultaneously, reduced noise.

Described centrifugal blower 2 bodies comprise supporting bearing base 21 successively, rotor 22, thrust shaft block 23, coupling 24 and motor 25, on described rotor 22, be nested with stator 26, described stator 26 comprises air inlet volute 261, plural number dividing plate 262 and exhaust volute 263, between described dividing plate 262, form runner 264, described dividing plate 262 upper ends are provided with transition arc 265, the width of runner 264 described in this structure is 10mm, because small flow region fan efficiency is low, after arranging transition arc 265, described dividing plate 262 upper ends make flow smooth and easyly to flow, described rotor 22 comprises main shaft 221, be fixed on the round nut 222 on described main shaft 221, plural number axle sleeve 223, plural number impeller 224 and Balance disc 225, described axle sleeve 223 with shown in impeller 224 intervals arrange, and the diameter of described impeller is 670mm, exit width is 8mm, described coupling 24 is diaphragm coupling, outside is provided with coupling guard 27.

Described exhaust volute 263 sidewalls are provided with reflow pipe 28 and are connected with described main shaft 221, and to be communicated with blower fan import and outlet, balance blower fan axial force, reduces bearing loss.

The disclosed centrifugal hp fluid air machine of a kind of 135MW recirculating fluidized bed, break the monopoly position that 135MW Properties of CFB hp fluid air machine all adopts Roots blower, and make power station hp fluid air machine operation more stable, vibrate less, noise is lower, maintenance cost reduces greatly, and its energy variable working condition, for power station, it can not purchase blower fan again, this centrifugal blower meets variable working condition demand on a large scale, and by small flow fan efficiency, particularly Multi-stage centrifugal fan efficiency is brought up to 78% height, make also relatively easy.

Technology contents of the present invention and technical characteristics have disclosed as above; but those of ordinary skill in the art still may do all replacement and modifications that does not deviate from spirit of the present invention based on announcement of the present invention; therefore; protection domain of the present invention should be not limited to the content that embodiment discloses; and should comprise various do not deviate from replacement of the present invention and modifications, and contained by present patent application claim.

Claims

1. the centrifugal hp fluid air machine of 135MW recirculating fluidized bed, comprise support, be fixed on the centrifugal blower body on described support, connect import mechanism and the exit mechanism of described centrifugal blower body, it is characterized in that: described import mechanism comprises the import baffler connecting successively, the first pipeline, import butterfly valve, second pipe and import expansion joint, described exit mechanism comprises the outlet non-return valve connecting successively, the 3rd pipeline, exit butterfly valve, the 4th pipeline and outlet expansion joint, described centrifugal blower body comprises supporting bearing base successively, rotor, thrust shaft block, coupling and motor, on described rotor, be nested with stator, described stator comprises air inlet volute, plural number dividing plate and exhaust volute, between described dividing plate, form runner, described rotor comprises main shaft, be fixed on the round nut on described main shaft, plural number axle sleeve, plural number impeller and Balance disc, the exit width of described impeller is 8mm.

2. the centrifugal hp fluid air machine of 135MW recirculating fluidized bed according to claim 1, is characterized in that: described the 4th pipeline is also connected with outlet bypass valve and outlet bypass baffler.

3. the centrifugal hp fluid air machine of 135MW recirculating fluidized bed according to claim 1, is characterized in that: described coupling outside is provided with coupling guard.

4. the centrifugal hp fluid air machine of 135MW recirculating fluidized bed according to claim 1, is characterized in that: described coupling is diaphragm coupling.

5. the centrifugal hp fluid air machine of 135MW recirculating fluidized bed according to claim 1, is characterized in that: described exhaust volute sidewall is provided with reflow pipe and is connected with described main shaft, to be communicated with blower fan import and outlet.

6. the centrifugal hp fluid air machine of 135MW recirculating fluidized bed according to claim 1, is characterized in that: described dividing plate upper end is provided with transition arc.