CN210460775U - Double-stage organic Rankine cycle system based on air bearing - Google Patents
Double-stage organic Rankine cycle system based on air bearing Download PDFInfo
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- CN210460775U CN210460775U CN201920751629.8U CN201920751629U CN210460775U CN 210460775 U CN210460775 U CN 210460775U CN 201920751629 U CN201920751629 U CN 201920751629U CN 210460775 U CN210460775 U CN 210460775U
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Abstract
The utility model discloses a doublestage organic rankine cycle system based on air supporting bearing for solve conventional organic rankine cycle system efficiency lower and working medium and reveal the problem of wading into the foreign matter. In the utility model, the low-pressure liquid storage tank is connected with the high-pressure liquid storage tank through the working medium pump, the high-pressure liquid storage tank is connected with the evaporator, the evaporator is connected with the primary radial turbine expander through the pressure regulating valve, the primary radial turbine expander, the heat regenerator, the secondary radial turbine expander and the condenser are connected in sequence, and the condenser is connected with the low-pressure liquid storage tank; the high-pressure liquid storage tank is also connected with a high-speed motor through a first air bearing liquid supply pipe, a motor cooling liquid supply gate valve and a second air bearing liquid supply pipe respectively, and a motor cooling liquid outlet of the high-speed motor is connected with the second-stage radial turbine expander. The utility model discloses a totally closed nothing of organic rankine cycle system leaks, the promotion of certain degree system efficiency simultaneously.
Description
Technical Field
The utility model relates to a doublestage organic rankine cycle system based on air supporting bearing is applicable to low-grade waste heat power generation.
Background
An organic Rankine cycle system is a system capable of efficiently converting low-grade heat energy into electric energy, and is called an ORC system for short. The ORC system is a rankine cycle using low-boiling point organic matters as working media and mainly comprises four sets of a heat exchanger, a turbine, a condenser and a working medium pump, for example, the ORC system is disclosed in chinese patent with application number 201510105314.2. However, ORC systems have a lower thermodynamic cycle efficiency due to the low grade energy utilization. Taking a hot water heat source as an example, the thermodynamic cycle efficiency of a typical ORC system is about 10%. When the system is designed, the system efficiency is not necessarily improved effectively.
Meanwhile, the organic working medium has special properties and is expensive. Once leaked, not only will not cause small economic loss, but also will bring adverse effects to environment, safety and so on. The traditional expander has transmission parts, bearing sealing parts and the like, so that the leakage phenomenon is inevitable. The development of a set of novel organic Rankine cycle system without leakage and with high efficiency is necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that conventional organic rankine cycle system efficiency is lower and working medium reveals to involve in the outer, and provide a doublestage organic rankine cycle system based on air supporting bearing, the utility model discloses a totally closed nothing of organic rankine cycle system leaks, the promotion of a certain degree system efficiency simultaneously.
The utility model provides a technical scheme that above-mentioned problem adopted is: a two-stage organic Rankine cycle system based on an air bearing is characterized by comprising a low-pressure liquid storage tank, a working medium pump, a high-pressure liquid storage tank, an evaporator, a pressure regulating valve, a first-stage radial turbo expander, a heat regenerator, a second-stage radial turbo expander, a condenser, a first air bearing liquid supply pipe, a motor cooling liquid supply gate valve, a second air bearing liquid supply pipe and a high-speed motor; the low-pressure liquid storage tank is connected with the high-pressure liquid storage tank through a working medium pump, the high-pressure liquid storage tank is connected with an evaporator, the evaporator is connected with a primary radial turbine expander through a pressure regulating valve, the primary radial turbine expander, a heat regenerator, a secondary radial turbine expander and a condenser are sequentially connected, and the condenser is connected with the low-pressure liquid storage tank; the high-pressure liquid storage tank is connected with a high-speed motor through a first air bearing liquid supply pipe, a motor cooling liquid supply gate valve and a second air bearing liquid supply pipe respectively, and a motor cooling liquid outlet of the high-speed motor is connected with the second-stage radial turbine expander.
The working method comprises the following steps: the organic working medium starts from the low-pressure liquid storage tank, is boosted by the working medium pump, enters the high-pressure liquid storage tank, then enters the evaporator to be evaporated into superheated steam, is adjusted in pressure by the pressure adjusting valve, enters the primary radial turbine expander to do work, is heated by the heat regenerator, enters the secondary radial turbine expander to do work, then enters the condenser to be condensed into liquid state, and then returns to the low-pressure liquid storage tank.
Furthermore, the primary radial turbine expander and the secondary radial turbine expander are both connected with a single shaft of the high-speed motor, the shaft is supported by an air bearing, air supply working media are consistent with system circulation working media, the air supply working media are extracted from the high-pressure liquid storage tank, and air is supplied to the air bearing through a first air bearing liquid supply pipe and a second air bearing liquid supply pipe; the high-speed motor is cooled by liquid, a cooling liquid working medium is consistent with a system circulating working medium, is extracted from the high-pressure liquid storage tank and enters the electric outer cavity for cooling through the motor cooling liquid supply gate valve.
Further, the output power of each stage of impeller should be as close as possible; the axial force generated by each stage of impeller should be as close as possible; the individual rotational speeds of the impellers of each stage should be equal.
The whole system is divided into three subsystems of air supply, cooling and work doing circulation. Although working media of all subsystems leak each other to a certain extent, the system is integrally closed, and the working media in the subsystems are the same in liquid, so that the working media of the system do not leak to the outside.
Compared with the prior art, the utility model, have following advantage and effect: (1) the system is totally closed, no leakage exists to the outside, and the safety of the whole system is improved. (2) By adding the heat regenerator between the two stages of impellers, the cycle efficiency of the whole system is improved, and the power generation power is increased. (3) The design of the double-stage impeller ensures that the unbalanced axial force of the expander is small.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: the device comprises a low-pressure liquid storage tank 01, a working medium pump 02, a high-pressure liquid storage tank 03, an evaporator 04, a pressure regulating valve 05, a primary radial turboexpander 06, a heat regenerator 07, a secondary radial turboexpander 08, a condenser 09, a first air bearing liquid supply pipe 11, a motor cooling liquid supply gate valve 12, a second air bearing liquid supply pipe 13, a high-speed motor 14, a motor cooling liquid outlet 15, a heat source inlet 21, a heat source outlet 22, a condensed water inlet 31 and a condensed water outlet 32.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1, the two-stage organic rankine cycle system based on the air-floating bearing in the embodiment includes a low-pressure liquid storage tank 01, a working medium pump 02, a high-pressure liquid storage tank 03, an evaporator 04, a pressure regulating valve 05, a first-stage radial turbo expander 06, a heat regenerator 07, a second-stage radial turbo expander 08, a condenser 09, a first air-floating bearing liquid supply pipe 11, a motor cooling liquid supply gate valve 12, a second air-floating bearing liquid supply pipe 13, and a high-speed motor 14; the low-pressure liquid storage tank 01 is connected with the high-pressure liquid storage tank 03 through a working medium pump 02, the high-pressure liquid storage tank 03 is connected with the evaporator 04, the evaporator 04 is connected with the primary radial turbine expander 06 through a pressure regulating valve 05, the primary radial turbine expander 06, the heat regenerator 07, the secondary radial turbine expander 08 and the condenser 09 are sequentially connected, and the condenser 09 is connected with the low-pressure liquid storage tank 01; the high-pressure liquid storage tank 03 is also connected with a high-speed motor 14 through a first air bearing liquid supply pipe 11, a motor cooling liquid supply gate valve 12 and a second air bearing liquid supply pipe 13, and a motor cooling liquid outlet 15 of the high-speed motor 14 is connected with a second-stage radial turbine expander 08.
The working method comprises the following steps: the organic working medium starts from a low-pressure liquid storage tank 01, is boosted by a working medium pump 02, enters a high-pressure liquid storage tank 03, then enters an evaporator 04 to be evaporated into superheated steam, is adjusted in pressure by a pressure adjusting valve 05, enters a first-stage radial turbine expander 06 to do work, is heated by a heat regenerator 07, enters a second-stage radial turbine expander 08 to do work, then enters a condenser 09 to be condensed into liquid, and then returns to the low-pressure liquid storage tank 01.
The first-stage radial turbo expander 06 and the second-stage radial turbo expander 08 are both connected with a single shaft of a high-speed motor 14, the shafts are supported by air bearings, air supply working media are consistent with system circulation working media, the air supply working media are extracted from a high-pressure liquid storage tank 03, and air is supplied to the air bearings through a first air bearing liquid supply pipe 11 and a second air bearing liquid supply pipe 13; the high-speed motor 14 is cooled by liquid, a cooling liquid working medium is consistent with a system circulating working medium, is extracted from the high-pressure liquid storage tank 03, and enters the electric outer cavity for cooling through the motor cooling liquid supply gate valve 12.
The output power of each stage of impeller is close, and the maximum difference is not more than 20%; the axial force generated by each stage of impeller is close, and the maximum difference is not more than 10%; the individual rotational speeds of the impellers of each stage are equal.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as being included in the following claims.
Claims (2)
1. A two-stage organic Rankine cycle system based on an air bearing is characterized by comprising a low-pressure liquid storage tank (01), a working medium pump (02), a high-pressure liquid storage tank (03), an evaporator (04), a pressure regulating valve (05), a first-stage radial turboexpander (06), a heat regenerator (07), a second-stage radial turboexpander (08), a condenser (09), a first air bearing liquid supply pipe (11), a motor cooling liquid supply gate valve (12), a second air bearing liquid supply pipe (13) and a high-speed motor (14); the low-pressure liquid storage tank (01) is connected with the high-pressure liquid storage tank (03) through a working medium pump (02), the high-pressure liquid storage tank (03) is connected with an evaporator (04), the evaporator (04) is connected with a primary radial turbine expander (06) through a pressure regulating valve (05), the primary radial turbine expander (06), a heat regenerator (07), a secondary radial turbine expander (08) and a condenser (09) are sequentially connected, and the condenser (09) is connected with the low-pressure liquid storage tank (01); the high-pressure liquid storage tank (03) is connected with a high-speed motor (14) through a first air bearing liquid supply pipe (11), a motor cooling liquid supply gate valve (12) and a second air bearing liquid supply pipe (13), and a motor cooling liquid outlet (15) of the high-speed motor (14) is connected with a second-stage radial turbine expander (08).
2. The air bearing-based two-stage organic Rankine cycle system according to claim 1, wherein the first-stage radial turbo expander (06) and the second-stage radial turbo expander (08) are both uniaxially connected with a high-speed motor (14).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242375A (en) * | 2019-05-23 | 2019-09-17 | 华电电力科学研究院有限公司 | A kind of twin-stage organic rankine cycle system and its working method based on air-bearing |
| CN113309678A (en) * | 2021-06-20 | 2021-08-27 | 山东电力研究院 | Two-stage turbine ocean temperature difference energy thermal cycle power generation system and method |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242375A (en) * | 2019-05-23 | 2019-09-17 | 华电电力科学研究院有限公司 | A kind of twin-stage organic rankine cycle system and its working method based on air-bearing |
| CN113309678A (en) * | 2021-06-20 | 2021-08-27 | 山东电力研究院 | Two-stage turbine ocean temperature difference energy thermal cycle power generation system and method |
| CN113309678B (en) * | 2021-06-20 | 2023-02-03 | 国网山东省电力公司电力科学研究院 | Two-stage turbine ocean temperature difference energy thermal cycle power generation system and method |
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