CN203272249U - Forced circulation pump hydraulic component for 600MW thermal power station ultra-supercritical boiler - Google Patents

Abstract

The utility model relates to a forced circulation pump hydraulic component for a 600MW thermal power station ultra-supercritical boiler. The forced circulation pump hydraulic component is composed of a pump shell, an impeller, a guide vane and a suction horn mouth. According to the pump shell, a spherical water pumping chamber is selected. An inlet pipe nozzle is designed to be arranged on the top of the pump shell. After sucked from an inlet pipe along the axis of the impeller and pressurized, media are discharged through a radial inclined outlet pipe. The impeller is arranged inside the guide vane. The guide vane and the suction horn mouth are in linkage to be used as the transition of water flow between the impeller and the spherical water pumping chamber so as to play roles in recycling the circulating media and converting kinetic energy into pressure energy. A test shows that the efficiency of the hydraulic component reaches 78.47% at the designed point, a head curve is smooth, the operation is stable within the design flow range, and the forced circulation pump hydraulic component for the 600MW thermal power station ultra-supercritical boiler meets the operational requirements of a 600MW ultra-supercritical boiler forced circulation pump in a thermal power station.

Description

The 600MW thermal power station ultra-supercritical boiler hydraulic part of forced circulation pump

Technical field: the utility model relates to a kind of 600MW thermal power station ultra-supercritical boiler with the hydraulic part of forced circulation pump.

Background technique: the domestic technology of only having now at present subcritical boiler forced circulation pump hydraulic part does not have the designing technique of ultra-supercritical boiler forced circulation pump hydraulic part.Moreover the characteristics of the design parameter of subcritical boiler forced circulation pump hydraulic part are that flow is large, and lift is low, and operating pressure is low, and the parameter characteristic of ultra-supercritical boiler forced circulation pump hydraulic part is that flow is little, and lift is high, and operating pressure is high.Therefore the technology of subcritical boiler forced circulation pump hydraulic part can not meet the designing requirement of the hydraulic part of ultra-supercritical boiler forced circulation pump.

The content of invention: the purpose of this utility model is to provide a kind of 600MW of realization thermal power station ultra-supercritical boiler with the hydraulic part of forced circulation pump.The technical solution of the utility model is: a kind of 600MW thermal power station ultra-supercritical boiler is with the hydraulic part of forced circulation pump, consisted of by pump case (1), impeller (2), stator (3) and suction cone (4), pump case (1) is spherical pressurized water chamber structure, is comprised of entrance (1-1), outlet (1-2) and end flange (1-3); Suction cone (4), impeller (2) and stator (3) are positioned at pump case (1), and the intake section of suction cone (4) is connected 1 with pump case) entrance (1-1) connect, the exit portion of suction cone (4) is connected with stator (3); Impeller (2) is in stator (3), and the entrance of impeller (2) is corresponding with the outlet of suction cone (4), and the exit portion of impeller (2) is corresponding with the intake section of stator (3).Working medium in the apparatus of thermo-electric power boiler vapour system enters from the suction port (1-1) of pump case (1), enters impeller (2) through suction cone (4), obtains energy by the rotation of impeller (2).Stator (3) links with suction cone (4) as the transition of impeller (2) with pump case (1) runner current, plays the medium that reclaims impeller (2) outlet, kinetic transformation is become the effect of pressure energy.

Working principle: a kind of 600MW thermal power station ultra-supercritical boiler is with the hydraulic part (as Fig. 1) of forced circulation pump, working medium in the apparatus of thermo-electric power boiler vapour system enters from the suction port (1-1) of pump case (1), enter impeller (2) through suction cone (4), impeller (2) by the motor drives rotation obtains energy, stator (3) is as the transition of impeller (2) with pump case (1) runner current, play the medium that reclaims impeller (2) outlet, kinetic transformation is become the effect of pressure energy.

The effect of invention:

1. as shown in Figure 1, the working pressure of this pump is 30MPa, and pump case (1) is designed to spherical pressurized water chamber structure, is with bearing larger pressure under wall thickness for the pump parts that guarantee.

2. because pump case (1) is the hydraulic part that bears High Temperature High Pressure, structure is complicated again, and is high to the quality requirement of forging, can't solid forging.Therefore be designed to by entrance (1-1), one tiltedly the part welding of outlet (1-2) and three forgings of end flange (1-3) form.

3. Way out and Way in are designed to 65 degree angles, are to reach Best Point for the direction that guarantees current and the efficient of pump.

4. be provided with the effect that suction bell pipe (4) plays isolation stator (3) outlet zone of high pressure and impeller (2) suction port low pressure area between the entrance of impeller (2) and pump case (1) suction port.

5. the medium in the apparatus of thermo-electric power boiler vapour system enters from the suction port (1-1) of pump case (1), enters impeller (2) through suction cone (4), by the Spin-up of impeller (2), thereby makes working medium obtain energy.

6. stator (3) as the transition of impeller (2) with pump case (1) runner current, links with suction cone (4), plays the medium that reclaims impeller (2) outlet, kinetic transformation is become the effect of pressure energy.

Description of drawings:

Fig. 1 the utility model overall structure figure

Fig. 2 is the utility model hydraulic part performance chart

Fig. 3 is the utility model design parameter figure

Embodiment:

As shown in Figure 1, a kind of 600MW thermal power station ultra supercritical is made of pump case 1, impeller 2, stator 3 and suction cone 4 with the hydraulic part of boiler forced-circulating pump, and pump case 1 be spherical pressurized water chamber structure, by entrance 1-1, export 1-2 and end flange 1-3 forms; Suction cone 4, impeller 2 and stator 3 are positioned at pump case 1, and the entrance 1-1 that the intake section of suction cone 4 is connected with pump case connects, and the exit portion of suction cone 4 is connected with stator 3; Impeller 2 is in stator 3, and the entrance of impeller 2 is corresponding with the outlet of suction cone 4, and the exit portion of impeller 2 is corresponding with the intake section of stator 3.

As shown in Figure 3, according to the power station Operational Limits of a kind of 600MW thermal power station ultra-supercritical boiler with forced circulation pump, design discharge 1003.8m ³/ h, rated lift 90.75m.

Specific speed calculates: mistake! Do not find Reference source.A mistake! Do not find Reference source.

In formula: n _s-specific speed

N-rotating speed r/min

Q-flow m ³/ s

H-lift m

Specific speed:

Hot:

$n_s=\frac{3.65n\sqrt{{\mathrm{<figure-callout\; id="3"\; label="Q\; t\; H"\; filenames="HDA00003270624400011.png"\; state="\{\{state\}\}">Q</figure-callout>}}_t}}{H^{}}=\frac{3.65\&times;2951\&times;\sqrt{1003.8/3600}}{{90.75}^{3/4}}=193.4$

Cold conditions:

$n_s=\frac{3.65n\sqrt{{\mathrm{<figure-callout\; id="3"\; label="Q\; t\; H"\; filenames="HDA00003270624400011.png"\; state="\{\{state\}\}">Q</figure-callout>}}_t}}{H^{}}=\frac{3.65\&times;2951\&times;\sqrt{586.2/3600}}{{109.9}^{3/4}}=128.1$

This specific speed n _SIn 80～300 scopes, the blade wheel structure form is centrifugal.The number of blade is elected 7 as.The major function of stator is to be pressure energy with the liquid kinetic transformation that impeller produces, and its design is very large on the impact of efficient, adopts radially diffuser, and the number of blade is elected 10 as.

The hydraulic part that design is processed carries out model test, obtains performance curve such as Fig. 2 of hydraulic part, can find out, in 80%-120% range of flow doubly, head curve is smooth, without the hump district, meets designing requirement.Optimum point efficient is about 78.47%, meets design requirement.In whole design discharge scope, net positive suction head has satisfied designing requirement preferably less than 9.5m.

Claims (1)

1. a 600MW thermal power station ultra-supercritical boiler is with the hydraulic part of forced circulation pump, consisted of by pump case (1), impeller (2), stator (3) and suction cone (4), it is characterized in that: pump case (1) is spherical pressurized water chamber structure, is comprised of entrance (1-1), outlet (1-2) and end flange (1-3); Suction cone (4), impeller (2) and stator (3) are positioned at pump case (1), and the intake section of suction cone (4) is connected 1 with pump case) entrance (1-1) connect, the exit portion of suction cone (4) is connected with stator (3); Impeller (2) is in stator (3), and the entrance of impeller (2) is corresponding with the outlet of suction cone (4), and the exit portion of impeller (2) is corresponding with the intake section of stator (3).

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