CN209068817U - A kind of jetting type organic rankine cycle system - Google Patents

Abstract

This application discloses a kind of jetting type organic rankine cycle system, including jet pump, the first evaporator, fluid power-generation unit, the first condenser, gas-liquid separator and force (forcing) pumps；The fluid outlet of jet pump is connect by the first evaporator with the fluid inlet of fluid power-generation unit；The driving fluid entrance of jet pump and the gas vent of gas-liquid separator connect；The Working-fluid intaking of jet pump is connected by the liquid outlet of force (forcing) pump and gas-liquid separator；The fluid inlet of gas-liquid separator is connect by the first condenser with the fluid outlet of fluid power-generation unit.This system use jet pump and gas-liquid separator, be able to achieve the composition regulation of non-azeotropic mixed working medium, can not only realize with the better Temperature Matching of Cooling and Heat Source, in addition jet pump can get higher outlet pressure, further increase system circulation efficiency.

Description

A jet organic Rankine cycle system

technical field

The present application relates to the technical field of organic Rankine cycle power generation, and in particular, to a jet organic Rankine cycle system.

Background technique

With the rapid growth of energy consumption, energy shortages and increasingly serious problems of environmental pollution, people seek new energy solutions. The development of renewable energy and the recovery and utilization of low-grade energy have been paid more and more attention, and have become an important way to solve the energy crisis. Among many approaches, the organic Rankine cycle (ORC) has received extensive attention due to its simple structure, wide temperature adaptation range, less resource occupation, and flexible configuration of unit capacity, and is considered to be the most promising thermal conversion technology.

The working fluid realizes energy transmission and conversion in the ORC system, so the working fluid plays a decisive role in the efficiency and structure of the entire system. The traditional ORC system uses pure working fluid, and its evaporation and condensation process temperature is basically unchanged, and it is difficult to match the temperature of the cold/heat source well. The use of a non-azeotropic mixed working fluid can improve the temperature matching of the cold/heat source to a certain extent, but the heat transfer coefficient of the non-azeotropic mixed working fluid is lower than that of the pure working fluid, and the heat exchange area needs to be increased under the same heat transfer amount. , which limits the effective promotion of non-azeotropic mixtures in ORC systems.

Therefore, how to design an ORC system to make more efficient use of energy while solving the problem of matching the temperature with the cold/heat source is a technical problem to be solved by those skilled in the art.

Utility model content

The purpose of the present application is to provide a jet organic Rankine cycle system, which enables more efficient use of energy while achieving better temperature matching with the cold/heat source.

In view of this, the present application provides a jet organic Rankine cycle system, including a jet pump, a first evaporator, a fluid generator set, a first condenser, a gas-liquid separator and a pressurized pump;

The fluid outlet of the jet pump is connected to the fluid inlet of the fluid generator set through the first evaporator;

The ejection fluid inlet of the jet pump is connected with the gas outlet of the gas-liquid separator;

The working fluid inlet of the jet pump is connected with the liquid outlet of the gas-liquid separator through the pressurizing pump;

The fluid inlet of the gas-liquid separator is connected with the fluid outlet of the fluid generator set through the first condenser.

preferably,

also includes a second evaporator;

the fluid inlet of the second evaporator is connected with the fluid outlet of the pressurizing pump;

The fluid outlet of the second evaporator is connected to the working fluid inlet of the jet pump.

preferably,

also includes a second condenser;

The fluid inlet of the second condenser is connected with the gas outlet of the gas-liquid separator;

The fluid outlet of the second condenser is connected to the ejection fluid inlet of the jet pump.

preferably,

Also includes a control module;

The control module is used to control the channel size of the gas outlet and/or the liquid outlet of the gas-liquid separator.

preferably,

The control module specifically includes a first control valve and a second control valve;

the first control valve is arranged in the gas outlet channel of the gas-liquid separator;

The second control valve is arranged in the liquid outlet channel of the gas-liquid separator.

preferably,

Also includes regulating valve,

The regulating valve is arranged in the cold source circulation channel of the first condenser.

preferably,

The fluid generator set specifically includes a turbine and a motor.

preferably,

The turbine is specifically: an impeller, a steam turbine, a turbine, a gas turbine or an expander.

Compared with the prior art, the advantages of the embodiments of the present application are:

In the embodiment of the present application, a jet organic Rankine cycle system is provided, including a jet pump, a first evaporator, a fluid generator set, a first condenser, a gas-liquid separator, and a pressurized pump; the pressurized pump, the jet The pump, the first evaporator, the fluid generator set, the first condenser, and the gas-liquid separator are connected in sequence; the gas outlet of the gas-liquid separator is connected to the ejection fluid inlet of the jet pump, and the liquid outlet of the gas-liquid separator is connected to the pressurized fluid outlet. Pump fluid inlet connection.

Compared with the prior art, the system provided by the present application has the following characteristics: First, the gas-liquid separator is used to separate the components of the non-azeotropic mixed working medium, so as to achieve better matching with the temperature of the cold/heat source and improve the non-azeotropic mixture. The heat transfer coefficient of the azeotropic working fluid; second, the use of the boosting characteristics and ejection characteristics of the jet pump to obtain a larger boosting ratio, that is, the gas pressure at the inlet of the generator set is higher, so as to realize the cascade utilization of temperature.

Therefore, the jet organic Rankine cycle system provided by the present application utilizes the working fluid of different components formed by the non-azeotropic mixed working fluid through the gas-liquid separator combined with the boosting characteristics and ejecting characteristics of the jet pump to obtain a higher than working pressure. The high liquid level enables more efficient use of energy while achieving a better match with the temperature of the cold/heat source, and achieves the beneficial effect that the non-azeotropic mixed working fluid can be effectively promoted in the ORC system, which has academic value and application prospects. .

Description of drawings

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. The drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of a jet organic Rankine cycle system provided by an embodiment of the application;

FIG. 2 is a schematic structural diagram of a jet pump of a jet organic Rankine cycle system according to an embodiment of the present application.

Label: the working fluid inlet s1 of the jet pump; the jetting fluid inlet s2 of the jet pump; the fluid outlet s3 of the jet pump; the nozzle throat e1; the mixing chamber e2; the mixing chamber throat e3; the diffusion chamber e4; the first channel 1 The second channel 2; the third channel 3; the fourth channel 4; the fifth channel 5; the sixth channel 6; the seventh channel 7; the eighth channel 8; the ninth channel 9; the second evaporator 101; the jet pump 102 ; first evaporator 103; turbine 104; motor 105; first condenser 106; gas-liquid separator 107; second condenser 108; Cold source 803; second cold source 804.

Detailed ways

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

Please refer to FIG. 1 , which is a schematic structural diagram of a jet organic Rankine cycle system according to an embodiment of the present application.

The embodiment of the present application provides a jet organic Rankine cycle system, including a jet pump 102, a first evaporator 103, a fluid generator set, a first condenser 106, a gas-liquid separator 107, and a pressurizing pump 109;

The fluid outlet of the jet pump 102 is connected with the fluid inlet of the first evaporator 103; the fluid outlet of the first evaporator 103 is connected with the fluid inlet of the fluid generator set; the fluid outlet of the fluid generator set is connected with the fluid inlet of the first condenser 106 ; The fluid outlet of the first condenser 106 is connected to the fluid inlet of the gas-liquid separator 107 . That is, the flow direction of the working fluid injected by the jet pump 102 is: the fluid outlet of the jet pump 102 → the first evaporator 103 → the fluid generator set → the first condenser 106 → the gas-liquid separator 107 .

In the non-azeotropic working fluid condensed by the first condenser 106 , the high-boiling point components are in liquid state in the gas-liquid separator 107 after condensation, while the low-boiling point components are still present in the gas-liquid separator 107 gaseous.

The liquid outlet of the gas-liquid separator 107 is connected to the fluid inlet of the pressurizing pump 109; the fluid outlet of the pressurizing pump 109 is connected to the working fluid inlet of the jet pump 102, and the liquid high boiling point components in the gas-liquid separator 107 are pressurized The pressurization of the pump 109 enters the jet pump 102 as the working fluid. The gas outlet of the gas-liquid separator 107 is connected to the ejection fluid inlet of the jet pump 102 , and the gaseous low-boiling point components in the gas-liquid separator 107 enter the jet pump 102 as ejection fluid.

It can be understood that the working fluid and the ejecting fluid in the jet pump 102 can be non-azeotropic mixture working fluids with the same composition but different ratios, which have better characteristics of matching the temperature of the cold/heat source, and the pressure of the fluid outlet is higher than that of the working fluid. Import pressure is higher.

In the jet pump 102 of a jet organic Rankine cycle (ORC) system provided by the embodiment of the present application, the high-boiling point working fluid is used as the working fluid, and the low-boiling point working fluid is used as the ejecting fluid, and the pressure obtained at the outlet is higher than that of the working fluid. high fluid. The gas-liquid separator 107 conducts gas-liquid separation of the high and low boiling point working fluids in the non-azeotropic working fluid, so that the non-azeotropic working fluid can be better matched with the temperature of the cold/heat source, and the heat transfer temperature difference can be reduced. Exergy losses of the system. Compared with the existing technology, the ORC system provided by this application introduces a jet pump, and the working fluid and the ejecting fluid form a shock wave in the mixing chamber of the jet pump, the speed is significantly reduced, the pressure is significantly increased, and a higher gain is obtained at the inlet of the expander. The inlet pressure increases the output work of the system; the use of the gas-liquid separator 107 can realize the separation of the non-azeotropic mixed working fluid, which provides conditions for better matching of the temperature of the mixed working fluid and the cold and heat source. In addition, according to different needs (such as region, working environment, and working purpose), the system can also choose different non-azeotropic working fluids to meet different heat and cold/source requirements, so as to achieve the best state of the system and achieve full utilization of energy.

Further, the jet organic Rankine cycle system provided by the present application may further include a second evaporator 101 .

The second evaporator 101 is located between the pressurizing pump 109 and the jet pump 102, specifically: the fluid inlet of the second evaporator 101 is connected to the fluid outlet of the pressurizing pump 109; the fluid outlet of the second evaporator 101 is connected to the jet pump 102 working fluid inlet connection.

The second evaporator 101 exchanges heat with the second heat source 801 for heating the high-boiling liquid working medium flowing out of the gas-liquid separator 107 to improve its utilization rate.

In addition, the jet organic Rankine cycle system provided by the present application may further include a second condenser 108 .

The second condenser 108 is located between the jet pump 102 and the gas-liquid separator 107, specifically: the fluid inlet of the second condenser 108 is connected to the gas outlet of the gas-liquid separator 107; the fluid outlet of the second condenser 108 is connected to the jet pump The ejection fluid inlet connection of 102.

The second condenser 108 exchanges heat with the second cold source 804 for condensing the low-boiling liquid working medium flowing out of the gas-liquid separator 107 to improve its utilization rate.

The first evaporator 103 exchanges heat with the first heat source 802 for heating the working fluid in the first evaporator 103 ; the second evaporator 101 exchanges heat with the second heat source 801 for heating the working medium in the second evaporator 101 . The first condenser 106 exchanges heat with the first cold source 803 for condensing the working fluid in the first condenser 106; the second condenser 108 exchanges heat with the second cold source 804 for condensing the second condenser The working fluid in 108.

The working fluid used in the system is a non-azeotropic mixed working fluid, and the temperature-changing characteristics of the non-azeotropic working fluid can better match the temperature change of the cold/heat source fluid, which can increase the net work of ORC and improve the cycle efficiency. The use of the compositional tunability of the non-azeotropic working fluid can further reduce the average heat exchange temperature difference and improve the cycle efficiency. A second condenser and a gas-liquid separator are added to the ORC system, and the cascade utilization of energy is formed by setting up a second evaporator for heat exchange. The high-boiling components at the outlet of the gas-liquid separator are pumped into the second evaporator by the pressurized pump, and the working fluid at the outlet of the second evaporator is used to eject the working fluid of the auxiliary circuit; the low-boiling point at the outlet of the gas-liquid separator The component working medium enters the second condenser to be condensed, and the low boiling point component working medium at the outlet of the second condenser enters the jet pump as an ejection fluid. The high boiling point components and the low boiling point components directly contact heat exchange inside the jet pump, and mass exchange, momentum exchange and energy exchange occur. At the same time, due to the existence of shock wave phenomenon, a fluid higher than the working fluid pressure is finally formed at the outlet of the jet pump.

Please refer to FIG. 2 , which is a schematic structural diagram of a jet pump of a jet organic Rankine cycle system according to an embodiment of the present application.

The working process of the system provided by the embodiment of the present application is as follows: the high-temperature and high-pressure gas obtained by heating by the second evaporator enters the working fluid inlet s1 of the jet pump as the working fluid, and the low-temperature and low-pressure liquid obtained by condensation by the second condenser enters as the ejection fluid. The ejection fluid inlet s2 of the jet pump; the working fluid reaches the sonic speed at the nozzle throat e1, and then is discharged at subsonic speed, and the pressure is lower than the ejection fluid at this time; the working fluid and the ejection fluid are mixed in the mixing chamber e2, and mass, The complex mixing process of heat and energy exchange finally forms a fluid, which produces a condensation shock wave at the throat e3 of the mixing chamber of the jet pump. It is reduced and finally discharged at the fluid outlet s3 of the jet pump at a pressure higher than the working fluid, which is used for the work of the expander. The working principle of the jet pump is to convert part of the available energy in the heat released by the condensation of high temperature gas into potential energy to increase the pressure of the fluid.

Please refer to Figure 1.

Further, a control module may also be included; the control module is used to control the size of the passage of the gas outlet and/or the liquid outlet of the gas-liquid separator 107 . Specifically, the control module specifically includes a first control valve and a second control valve; the first control valve is arranged in the fourth channel 4 where the gas outlet of the gas-liquid separator 107 is located; the second control valve is arranged in the gas-liquid separator 107 in the fifth channel 5 where the liquid outlet is located.

It can be understood that adding a control module to adjust the gas-liquid separator 107 can realize the adjustment of the working medium component ratio in the jet pump 102. For example, increasing the valve port of the first control valve can increase the low boiling point group. The proportion of the fraction in the jet pump 102 . Other rules for the adjustment of the control valve should be the technology well known to those skilled in the art, and will not be repeated here. protected content.

Further, a regulating valve may also be included, and the regulating valve is arranged in the cooling source circulation channel of the first condenser 106, specifically, is arranged at the connection between the first condenser 106 and the first cooling source 803, and is used for regulating the cooling source Flow rate, thereby reclassifying high and low boiling point working fluids in non-azeotropic mixtures. For example, when the regulating valve is controlled, the flow rate of the cold source of the first condenser 106 is reduced, and the condensation effect thereof is also reduced, so that a part of the working medium originally belonging to the high boiling point is still in the gaseous state because it cannot reach the condensing temperature. , this kind of working fluid will be classified as low boiling point working fluid.

Further, the fluid generator set may be specifically composed of a turbine 104 and a motor 105 . Wherein, the turbine can be specifically an impeller, a steam turbine, a turbine, a gas turbine or an expander according to the working environment or application of the system.

To sum up, the jet organic Rankine cycle system provided by the present application has the following advantages: (1) the composition of the working fluid is adjustable, which can better match the temperature change of the cold/heat source; (2) the injection ratio of the jet pump larger, so as to realize the increase of the output work of the fluid generator set; (3) the step-by-step utilization of energy.

It should be understood that, in this application, "at least one (item)" refers to one or more, and "a plurality" refers to two or more. "And/or" is used to describe the relationship between related objects, indicating that there can be three kinds of relationships, for example, "A and/or B" can mean: only A, only B, and both A and B exist , where A and B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b or c, can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c" ", where a, b, c can be single or multiple.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims (8)

1. a jet organic Rankine cycle system, is characterized in that, Including a jet pump, a first evaporator, a fluid generator set, a first condenser, a gas-liquid separator and a pressurized pump; The fluid outlet of the jet pump is connected to the fluid inlet of the fluid generator set through the first evaporator; The ejection fluid inlet of the jet pump is connected with the gas outlet of the gas-liquid separator; The working fluid inlet of the jet pump is connected with the liquid outlet of the gas-liquid separator through the pressurizing pump; The fluid inlet of the gas-liquid separator is connected with the fluid outlet of the fluid generator set through the first condenser. 2. The jet organic Rankine cycle system according to claim 1, characterized in that, also includes a second evaporator; the fluid inlet of the second evaporator is connected with the fluid outlet of the pressurizing pump; The fluid outlet of the second evaporator is connected to the working fluid inlet of the jet pump. 3. The jet organic Rankine cycle system according to claim 1 or 2, characterized in that, also includes a second condenser; The fluid inlet of the second condenser is connected with the gas outlet of the gas-liquid separator; The fluid outlet of the second condenser is connected to the ejection fluid inlet of the jet pump. 4. The jet organic Rankine cycle system according to claim 1, characterized in that, Also includes a control module; The control module is used to control the channel size of the gas outlet and/or the liquid outlet of the gas-liquid separator. 5. The jet organic Rankine cycle system according to claim 4, characterized in that, The control module specifically includes a first control valve and a second control valve; the first control valve is arranged in the gas outlet channel of the gas-liquid separator; The second control valve is arranged in the liquid outlet channel of the gas-liquid separator. 6. The jet organic Rankine cycle system according to claim 1, characterized in that, Also includes regulating valve, The regulating valve is arranged in the cold source circulation channel of the first condenser. 7. The jet organic Rankine cycle system according to claim 1, characterized in that, The fluid generator set specifically includes a turbine and a motor. 8. The jet organic Rankine cycle system according to claim 7, characterized in that, The turbine is specifically: an impeller, a steam turbine, a turbine, a gas turbine or an expander.