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Megawatt supercritical carbon dioxide centripetal turbine device

A carbon dioxide and turbine device technology, which is applied to steam engine devices, blade support elements, stators, etc., can solve the problems that ordinary shaft end sealing devices cannot meet the needs of sealing, the safety of shafting is reduced, and the mechanical loss is increased. It is easy to design the structural strength, improve the working ability, and reduce the effect of flow loss.

Active Publication Date: 2019-08-23
HARBIN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of such a high speed, the ordinary shaft end sealing device cannot meet the sealing requirements, and the safety of the shaft system is reduced
At the same time, if you want to use this type of turbine to generate electricity, you need multiple transmission devices for deceleration, which will inevitably lead to problems such as complex system, long shafting, increased mechanical loss, and large footprint

Method used

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  • Megawatt supercritical carbon dioxide centripetal turbine device
  • Megawatt supercritical carbon dioxide centripetal turbine device
  • Megawatt supercritical carbon dioxide centripetal turbine device

Examples

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specific Embodiment approach 1

[0027] Embodiment 1: A megawatt supercritical carbon dioxide centripetal turbine device, comprising a volute 1, a nozzle cascade 2 and a turbine impeller 3, the turbine impeller 3 is arranged at the center of the volute 1, and the turbine impeller A plurality of nozzle cascades 2 are arranged on the circumference of 3, and the turbine impeller 3 is composed of a disc 31 and blades 32. The two ends of the blade 32 are respectively provided with a blade inlet 4 and a blade outlet 7, and the end of the blade 32 is close to the blade inlet 4. is the tip of the blade 5, and the other end away from the blade inlet 4 is the blade root 6; in this way, the device uses the volute to guide the intake air and distributes the air evenly along the radial direction. It can effectively reduce the flow loss caused by the fluid flowing in the volute and reduce the flow noise. When working, the supercritical carbon dioxide working medium enters from the volute, and is evenly distributed to the no...

specific Embodiment approach 2

[0028] Specific embodiment 2: a pair of embodiments in conjunction with the description of this embodiment, the angle formed by the impeller blade airfoil on the tangent of the leading edge and the direction of the rotor radius is the inlet blade angle α, and the inlet blade angle α is 70°, so set, and The air intake of the traditional 90° impeller has a large difference. This impeller inlet angle matches well with the nozzle outlet airflow angle, which reduces the aerodynamic loss and greatly improves the operating efficiency of the turbine; the tangent line of the impeller blade airfoil at the trailing edge The included angle formed by the axial direction of the rotor is the outlet blade angle β, and the outlet blade angle β is 53°; in this way, the size of the blade inlet angle α and the outlet blade angle β is set so that the impeller can adapt to large flow conditions. Reduce impact and shedding losses.

specific Embodiment approach 3

[0029] Specific Embodiment Three: This embodiment is described in conjunction with Embodiments 1 and 2. The outer diameter D1 of the blade is 592.7mm, and the axial length h of the blade and the outer diameter D1 of the blade satisfy the following geometric relationship: h=0.16D1, and its specific value is 92mm , further optimized, the number of blades 32 is 18; so set, the diameter of the impeller is 3 to 4 times that of the existing supercritical carbon dioxide centripetal turbine, which can effectively improve the working ability of the impeller and the difference between the axial length of the blade and the outer diameter of the blade relationship, so that the flow condition of the impeller in the axial direction is good; the thickness of the blade top 5 is 6mm, the thickness of the blade root 6 is 10mm, the blade height of the edge of the blade inlet 4 is 8.56mm, and the blade height of the edge of the blade outlet 7 is 38mm ; The diameter D2 of the circumference where th...

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Abstract

The invention discloses a megawatt supercritical carbon dioxide centripetal turbine device and belongs to the technical field of turbines. The megawatt supercritical carbon dioxide centripetal turbinedevice comprises a volute, nozzle cascades and a turbine impeller, wherein the turbine impeller is arranged at the center of the volute, the multiple nozzle cascades are arranged in the circumferential direction of the turbine impeller, the turbine impeller consists of a wheel disc and blades, two ends of each blade are respectively provided with a blade inlet and a blade outlet, one end, close to the blade inlet, of each blade is a blade top, and the other end, far away from the blade inlet, of each blade is a blade root; the included angle formed by the tangent line of each impeller blade airfoil at the leading edge and the radius direction of a rotor is an inlet blade angle alpha, and the inlet blade angle alpha is 70 degrees; and the included angle formed by the tangent line of each impeller blade airfoil at the tail edge and the axial direction of the rotor is an outlet blade angle beta, the outlet blade angle beta is 53 degrees, the outer diameter D1 of each blade is 592.7mm, and the axial length h of each blade and the outer diameter D1 of the blade satisfy the following geometric relationship h = 0.16D1. The megawatt supercritical carbon dioxide centripetal turbine devicehas compact structure, low rotating speed, high efficiency, few auxiliary systems and wide engineering application prospects.

Description

technical field [0001] The invention relates to a megawatt-level supercritical carbon dioxide centripetal turbine device, which belongs to the technical field of turbines. Background technique [0002] In order to further improve the efficiency of the thermodynamic cycle and reduce the cost, the current research on cycle optimization and new power cycles is in the ascendant, among which the supercritical carbon dioxide Brayton cycle is considered to be one of the most promising alternative cycles. Supercritical carbon dioxide, as a supercritical fluid that has received wide attention at present, has the characteristics of high density, low viscosity, and low critical parameters. Therefore, the Brayton cycle using it as a working medium has the advantages of compact structure, high efficiency, safety and reliability. The supercritical carbon dioxide Brayton cycle power generation system mainly includes compressors, turbines, heat sources, generators and a series of auxiliary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D1/08F01D5/14F01D9/04F01D25/24F01K25/10
CPCF01D1/08F01D5/141F01D9/04F01D25/24F01K25/103
Inventor 冯永志谢永慧赵俊明李翔宇张秋鸿由岫冀文慧杜珮瑶
Owner HARBIN ELECTRIC CO LTD
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