Orc power plant and method for controlling the same

Abstract

The application relates to the technical field of low-temperature waste heat power generation, and particularly discloses an ORC (Organic Rankine Cycle) power generation device and a control method thereof. The ORC power generation device is provided with a compressor and a split reheater, part of working medium steam at the outlet of a turbine generator is reheated, the compressor works on the working medium steam in the process, then the working medium enters the split reheater to be heated, so that the working medium energy at the working medium outlet of the split reheater is higher, which is helpful to the improvement of power generation power, and when the temperature of a heat source greatly decreases, the unstable operation or forced shutdown caused by the great reduction of power generation power can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of low-temperature waste heat power generation technology, and in particular to an ORC power generation device and its control method. Background Technology

[0002] Low-temperature waste heat resources include industrial process waste heat, solar energy, ocean thermal energy conversion, and geothermal energy. In the industrial sector, low-temperature waste heat refers to the heat generated by industrial production processes, such as waste gas, condensate, hot water, and flue gas from boilers and industrial heating furnaces. Since low-temperature waste heat power generation largely utilizes low-temperature heat sources, power generation systems using steam as the circulating working fluid are not economically viable. Therefore, ORC (Organic Rankine Cycle) is often used in low-temperature waste heat power generation, employing an organic working fluid. Because organic working fluids can vaporize at relatively low temperatures to generate high pressure, driving turbine generators, they are well-suited for power generation from medium- and low-temperature heat sources. However, current ORC power generation systems experience a significant drop in power output when the heat source temperature decreases considerably, potentially leading to operational instability or even forced shutdown. Summary of the Invention

[0003] The purpose of this invention is to provide an ORC power generation device and its control method to solve the problem of unstable operation or even forced shutdown in existing ORC power generation systems when the temperature of the low-temperature heat source drops significantly.

[0004] This invention provides an ORC power generation device, including a working fluid evaporator connected to a heat source;

[0005] The turbine generator's inlet is connected to the working fluid outlet of the working fluid evaporator via a generator regulating valve.

[0006] The working fluid condenser has its inlet connected to the outlet of the turbine generator;

[0007] The working fluid circulation pump has its inlet connected to the outlet of the working fluid condenser and its outlet connected to the working fluid inlet of the working fluid evaporator.

[0008] Also includes:

[0009] The compressor's inlet is connected to the turbine generator's outlet;

[0010] The split reheater has its working fluid inlet connected to the compressor outlet and its working fluid outlet connected to the turbine generator inlet. The split reheater is also connected to a heat source, which can absorb heat from the heat source and heat the working fluid.

[0011] As a preferred technical solution for ORC power generation, it also includes a reheater regulating valve and an evaporator regulating valve. The reheater regulating valve is located between the split reheater and the heat source and is used to change the flow rate of the heat source into the split reheater. The evaporator regulating valve is located between the working fluid evaporator and the heat source and is used to change the flow rate of the heat source into the working fluid evaporator.

[0012] As a preferred technical solution for ORC power generation, it also includes a working fluid preheater. The working fluid inlet of the working fluid preheater is connected to the outlet of the working fluid circulation pump, the working fluid outlet of the working fluid preheater is connected to the working fluid inlet of the working fluid evaporator, the heat source outlet of the working fluid evaporator is connected to the working fluid preheater, and the heat source outlet of the diversion reheater is connected to the working fluid preheater. The working fluid preheater can absorb heat from the heat source and heat the working fluid.

[0013] As a preferred technical solution for ORC power generation devices

[0014] An evaporator temperature transmitter and an evaporator pressure transmitter are connected to the working fluid outlet of the working fluid evaporator. The evaporator temperature transmitter and the evaporator pressure transmitter are used to detect the temperature and pressure at the working fluid outlet of the working fluid evaporator, respectively.

[0015] A reheater temperature transmitter and a reheater pressure transmitter are connected at the working fluid outlet of the reheater. The reheater temperature transmitter and the reheater pressure transmitter are used to detect the temperature and pressure at the working fluid outlet of the reheater, respectively.

[0016] As a preferred technical solution for ORC power generation units, a check valve is installed between the compressor and the split reheater, and the check valve is unidirectionally open in the direction from the compressor to the split reheater.

[0017] This invention provides a control method for an ORC power generation device, applicable to any of the above-described ORC power generation devices. The control method for the ORC power generation device includes:

[0018] During the process of heating the working fluid in the working fluid evaporator, it is determined whether the working fluid evaporator can enable the turbine generator to achieve the preset power generation. If not, the split reheater and compressor are turned on.

[0019] As a preferred technical solution for the control method of ORC power generation unit, the power generation of turbine generator can reach the preset power generation capacity based on the temperature and pressure at the working fluid outlet of the working fluid evaporator and the power of the working fluid circulation pump.

[0020] As a preferred technical solution for the control method of ORC power generation unit, ORC power generation unit also includes a reheater regulating valve. The reheater regulating valve is set in the connection flow path between the split reheater and the heat source. The reheater regulating valve is used to change the flow rate of the heat source entering the split reheater.

[0021] During the operation of the reheater, determine whether the temperature at the working fluid outlet of the reheater is greater than the temperature at the working fluid outlet of the evaporator. If not, increase the opening of the reheater regulating valve.

[0022] As a preferred technical solution for the control method of ORC power generation unit, during the operation of the turbine generator, it is determined whether the power generation of the turbine generator has reached the preset power generation. If so, the shunt reheater is shut down and the compressor is shut down.

[0023] As a preferred technical solution for the control method of ORC power generation unit, the preset power generation capacity is 30%-40% of the rated power generation capacity of the turbine generator, and / or,

[0024] The compressor's operating power is 5%-20% of the actual power generated by the turbine generator.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention provides an ORC power generation device that reheats a portion of the working fluid exhaust steam at the turbine generator outlet by setting up a compressor and a split reheater. During this process, the compressor performs work on the working fluid exhaust steam, and then the working fluid enters the split reheater for heating. As a result, the working fluid energy at the split reheater outlet is higher, which helps to improve the power generation capacity. When the temperature of the heat source drops significantly, it effectively avoids operational instability or even forced shutdown caused by a significant reduction in power generation capacity. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the ORC power generation device in an embodiment of the present invention.

[0028] In the picture:

[0029] 10. Turbine generator; 11. Generator regulating valve; 20. Working fluid condenser; 30. Working fluid circulating pump; 40. Compressor; 41. Check valve; 50. Diverter reheater; 51. Reheater regulating valve; 52. Reheater temperature transmitter; 53. Reheater pressure transmitter; 60. Working fluid evaporator; 61. Evaporator regulating valve; 62. Evaporator temperature transmitter; 63. Evaporator pressure transmitter; 70. Working fluid preheater. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] like Figure 1As shown, the present invention provides an ORC power generation device, which includes a working fluid evaporator 60, a turbine generator 10, a working fluid condenser 20, a working fluid circulation pump 30, a compressor 40, and a split reheater 50. The working fluid evaporator 60 is connected to a heat source. The inlet of the turbine generator 10 is connected to the working fluid outlet of the working fluid evaporator 60 through a generator regulating valve 11. The inlet of the working fluid condenser 20 is connected to the outlet of the turbine generator 10. The inlet of the working fluid circulation pump 30 is connected to the outlet of the working fluid condenser 20, and the outlet of the working fluid circulation pump 30 is connected to the working fluid inlet of the working fluid evaporator 60. The inlet of the compressor 40 is connected to the outlet of the turbine generator 10. The working fluid inlet of the split reheater 50 is connected to the outlet of the compressor 40, and the working fluid outlet of the split reheater 50 is connected to the inlet of the turbine generator 10. The split reheater 50 is connected to a heat source and can absorb heat from the heat source to heat the working fluid. By setting up a compressor 40 and a split reheater 50, part of the working fluid exhaust steam at the outlet of the turbine generator 10 is reheated. During this process, the compressor 40 does work on the working fluid exhaust steam, and then the working fluid enters the split reheater 50 for heating, thereby increasing the working fluid energy at the outlet of the split reheater 50, which helps to improve the power generation. When the temperature of the heat source drops significantly, it can effectively avoid the instability of operation or even forced shutdown caused by a significant reduction in power generation, thus avoiding the loss of heat source energy caused by instability of operation or forced shutdown and restart.

[0035] Furthermore, the ORC power generation unit also includes a reheater regulating valve 51 and an evaporator regulating valve 61. The reheater regulating valve 51 is located in the connection path between the split reheater 50 and the heat source, and is used to change the flow rate of the heat source entering the split reheater 50. The heat source enters from the inlet of the reheater regulating valve 51, passes through the reheater regulating valve 51, and then enters the heat source inlet of the split reheater 50 from the outlet of the reheater regulating valve 51, heating the working fluid in the split reheater 50. The evaporator regulating valve 61 is located in the connection path between the working fluid evaporator 60 and the heat source, and is used to change the flow rate of the heat source entering the working fluid evaporator 60. The heat source enters from the inlet of the evaporator regulating valve 61, passes through the evaporator regulating valve 61, and then enters the heat source inlet of the working fluid evaporator 60 from the outlet of the evaporator regulating valve 61, heating the working fluid in the working fluid evaporator 60. During the start-up phase of the ORC power generation unit, the working fluid inside the unit needs to reach a certain temperature and pressure before it can drive the turbine generator 10 to generate electricity. Therefore, when starting the ORC power generation unit, the reheater regulating valve 51 and the generator regulating valve 11 are closed, allowing the working fluid evaporator 60 to rapidly heat the working fluid until the working fluid temperature and pressure at the outlet of the working fluid evaporator 60 are sufficient to drive the turbine generator 10 to generate electricity. Then, the generator regulating valve 11 is opened to allow the working fluid to enter the turbine generator 10 for power generation. The opening of the generator regulating valve 11 is gradually increased, and the compressor 40 and the reheater regulating valve 51 are simultaneously turned on to further increase the energy carried by the working fluid, shortening the time from start-up to stable operation of the ORC power generation unit.

[0036] A portion of the heat source enters the working fluid evaporator 60 to heat the working fluid, while the other portion enters the split reheater 50 to further heat the working fluid. The heat is then discharged from the heat source outlets of the working fluid evaporator 60 and the split reheater 50, respectively. At this point, the heat source still possesses some recoverable energy. To improve energy utilization efficiency, this embodiment also includes a working fluid preheater 70. The working fluid preheater 70 is located in the connecting flow path between the outlet of the working fluid circulation pump 30 and the working fluid inlet of the working fluid evaporator 60. The working fluid preheater 70 absorbs heat from the heat source and heats the working fluid. The working fluid inlet of the working fluid preheater 70 is connected to the outlet of the circulation pump, and the working fluid outlet of the working fluid preheater 70 is connected to the working fluid inlet of the working fluid evaporator 60. The heat source inlet of the working fluid preheater 70 is connected to the heat source outlet of the working fluid evaporator 60 and the heat source outlet of the split reheater 50. The heat source discharged from the heat source outlets of the working fluid evaporator 60 and the split reheater 50 enters the working fluid preheater 70 through the heat source inlet of the working fluid preheater 70 to preheat the working fluid in the working fluid preheater 70, thereby increasing the temperature at the working fluid outlet of the working fluid evaporator 60.

[0037] An evaporator temperature transmitter 62 and an evaporator pressure transmitter 63 are connected to the working fluid outlet of the working fluid evaporator 60. These transmitters are used to detect the temperature and pressure at the working fluid outlet of the evaporator 60, respectively. Similarly, a reheater temperature transmitter 52 and a reheater pressure transmitter 53 are connected to the working fluid outlet of the reheater 50. These transmitters are also used to detect the temperature and pressure at the working fluid outlet of the reheater 50. During ORC power generation, all heat is supplied through the working fluid evaporator 60 to heat the working fluid until the temperature and pressure at the working fluid outlet of the evaporator 60 are sufficient to drive the turbine generator 10 to generate electricity. At this point, the generator regulating valve 11 is opened to adjust the flow rate of the working fluid into the turbine generator 10, thereby driving the turbine generator 10 to generate electricity. Then, the reheater regulating valve 51 is opened and the compressor 40 is started, allowing the heat source to enter the working fluid evaporator 60 and the split reheater 50 respectively. Simultaneously, the opening degrees of the evaporator regulating valve 61 and the reheater regulating valve 51 are adjusted according to the temperature and pressure values ​​at the working fluid outlet of the split reheater 50, ensuring that the temperature at the working fluid outlet of the split reheater 50 is slightly higher than the temperature at the working fluid outlet of the working fluid evaporator 60. This guarantees a more ideal superheat after the working fluids at the outlets of the split reheater 50 and the working fluids at the outlets of the working fluid evaporator 60 are mixed, achieving efficient conversion of heat source energy.

[0038] Specifically, when the working fluid exhaust gas from the turbine generator 10 passes through the compressor 40, the pressure of the working fluid is increased. That is, the working fluid pressure entering the split reheater 50 after passing through the compressor 40 is greater than the working fluid pressure entering the working fluid evaporator 60 after passing through the working fluid circulation pump 30. Consequently, the saturation temperature of the working fluid in the split reheater 50 is greater than that in the working fluid evaporator 60. The saturation temperature of the working fluid heated by the split reheater 50 and the working fluid heated by the working fluid evaporator 60 after mixing is between the saturation temperatures of the working fluid in the split reheater 50 and the working fluid in the working fluid evaporator 60. Therefore, setting the temperature at the working fluid outlet of the split reheater 50 slightly higher than the temperature at the working fluid outlet of the working fluid evaporator 60 ensures a more ideal superheat of the working fluid entering the turbine generator 10 after mixing, thereby increasing the power generation capacity of the turbine generator 10.

[0039] Furthermore, when the ORC power generation system is running smoothly, the compressor 40 is shut down and the reheater regulating valve 51 is closed to reduce energy consumption. At this time, all the working fluid enters the turbine generator 10 through the working fluid evaporator 60. Since the working fluid outlet of the working fluid evaporator 60 and the working fluid outlet of the split reheater 50 are both connected to the turbine generator 10, in order to prevent the working fluid from entering the split reheater 50 and causing backflow to the compressor 40, resulting in energy loss, a check valve 41 is installed between the compressor 40 and the split reheater 50. The check valve 41 is unidirectionally open in the direction from the working fluid compressor 40 to the split reheater 50.

[0040] It should be noted that the turbine generator 10, generator regulating valve 11, working fluid condenser 20, working fluid circulation pump 30, compressor 40, check valve 41, diversion reheater 50, reheater regulating valve 51, reheater temperature transmitter 52, reheater pressure transmitter 53, working fluid evaporator 60, evaporator regulating valve 61, evaporator temperature transmitter 62, evaporator pressure transmitter 63, and working fluid preheater 70 mentioned in this embodiment can all adopt the structures in the prior art, so the above structures will not be described in detail here. In addition, the following scheme can be adopted as a preferred option in this embodiment: the turbine generator 10 adopts a high-speed permanent magnet synchronous generator, the compressor 40 adopts a centrifugal compressor with a high-speed permanent magnet motor, the working fluid circulation pump 30 adopts a variable frequency pump, and the working fluid condenser 20 adopts a cold source such as cooling water or air to cool the working fluid exhaust steam after work is done. The working medium is set as an organic working medium, such as R123, propane, n-butane, R245fa, R152a, chloroethane or isobutane, etc. In this embodiment, R245fa is preferred as the working medium.

[0041] This invention provides a control method for an ORC power generation device, applied to the ORC power generation device in the above embodiments. This method enables the ORC power generation device to reach a stable operating power output more quickly; it also ensures that when the heat source temperature drops significantly, the power output does not decrease drastically, thus avoiding operational instability or forced shutdown, thereby enabling the ORC power generation device to operate under wide load conditions. The method involves the ORC start-up phase, the ORC low-power power generation phase, the ORC stable power generation phase, and the ORC shutdown phase.

[0042] During the ORC startup phase, the working fluid needs to be heated first by the working fluid evaporator 60, and the working fluid steam drives the turbine generator 10 to generate electricity. Since the turbine generator 10's power output is low and its operation is unstable during this phase, it is necessary to determine whether the working fluid evaporator 60 can enable the turbine generator 10 to reach the preset power output. If not, the split reheater 50 and compressor 40 are then activated. It is understood that the working fluid steam needs to have a certain amount of energy during turbine generator 10 startup; that is, the turbine generator 10 can only start when the temperature and pressure at the working fluid outlet of the working fluid evaporator 60 reach the preset temperature and pressure values, respectively. If the power output of the turbine generator 10 after activation does not reach the preset power output, the split reheater 50 and compressor 40 are activated until the turbine generator 10's power output reaches the preset power output. The power output of the turbine generator 10 can be determined based on the temperature and pressure at the outlet of the working fluid in the working fluid evaporator 60 and the power of the working fluid circulation pump 30. Alternatively, the power output of the turbine generator 10 can be obtained by searching the map or data table embedded in the controller of the turbine generator 10. The specific methods are existing in the field and will not be described in detail here.

[0043] Specifically, during the ORC startup phase, this method includes:

[0044] Close the reheater regulating valve 51 and the generator regulating valve 11, turn off the compressor 40, and open the evaporator regulating valve 61 to heat the working fluid in the working fluid evaporator 60. The temperature and pressure at the working fluid outlet of the working fluid evaporator 60 are detected by the evaporator temperature transmitter 62 and the evaporator pressure transmitter 63, and it is determined whether the temperature and pressure at the working fluid outlet of the working fluid evaporator 60 have reached the preset temperature and preset pressure values. When the temperature and pressure at the working fluid outlet of the working fluid evaporator 60 reach the preset temperature and preset pressure values ​​respectively, the generator regulating valve 11 is opened and its opening degree is adjusted, the working fluid circulation pump 30 is started and its frequency is adjusted, so that the working fluid steam at the outlet of the working fluid evaporator 60 enters the turbine generator 10, driving the turbine generator 10 to generate electricity. In this embodiment, the preset temperature value is greater than or equal to 80°C, and the preset pressure value is greater than or equal to 0.6 MPa. Understandably, the working fluid steam at this time has a certain temperature and pressure. After the generator regulating valve 11 is opened, the working fluid steam passes through the turbine generator 10 at a certain flow rate under the pumping of the working fluid circulation pump 30, which is just enough to drive the turbine generator 10 to run and generate electricity. At this time, the ORC power generation unit is in the low-power generation stage. In the low-power generation stage of ORC, the method includes:

[0045] Open the reheater regulating valve 51 and start the compressor 40. Part of the working fluid exhaust steam at the outlet of the turbine generator 10 is pressurized by the compressor 40 and enters the split reheater 50 for heating. It then mixes with the working fluid steam at the outlet of the working fluid evaporator 60 and re-enters the turbine generator 10 to drive it to generate electricity. Because the compressor 40 performs work on the working fluid during this process, the power output of the turbine generator 10 can be rapidly increased. Since the compressor 40 is powered by an external power source, to avoid excessive energy consumption during this process, in this embodiment, the operating power of the compressor 40 is set to 5%-20% of the actual power output of the turbine generator 10, preferably 10%, to avoid unnecessary energy loss. During this process, the opening degree of the reheater regulating valve 51 needs to be changed synchronously to alter the flow rate of the heat source into the split reheater 50, thereby maximizing the utilization of the heat source energy. Therefore, the method further includes: determining whether the temperature at the working fluid outlet of the reheater 50 is greater than the temperature at the working fluid outlet of the evaporator 60; if not, increasing the opening of the reheater regulating valve 51. Based on the working fluid used in this embodiment being R245fa, and the preset temperature at the working fluid outlet of the evaporator 60 being greater than or equal to 80°C, the opening of the reheater regulating valve 51 is changed to ensure that the temperature at the working fluid outlet of the reheater 50 is greater than the temperature at the working fluid outlet of the evaporator 60, with a difference of 3-10°C, preferably 5°C. This makes the superheat of the working fluid entering the turbine generator 10 more ideal, thereby increasing the power generation capacity of the turbine generator 10. Correspondingly, when the temperature difference between the working fluid outlet of the split reheater 50 and the working fluid outlet of the working fluid evaporator 60 is greater than 5°C, the opening of the reheater regulating valve 51 is reduced; when the temperature difference between the working fluid outlet of the split reheater 50 and the working fluid outlet of the working fluid evaporator 60 is less than 5°C, the opening of the reheater regulating valve 51 is increased.

[0046] Through the above control methods, the ORC power generation unit can quickly increase its power output and achieve stable power generation operation more rapidly. Simultaneously, it ensures that when the heat source temperature drops significantly, the power output will not decrease drastically, thus avoiding operational instability or forced shutdown, enabling the ORC power generation unit to operate under wide load conditions. The control methods for determining whether the ORC power generation unit is operating stably, i.e., during the stable power generation phase of the ORC, include:

[0047] Determine whether the power output of the turbine generator 10 has reached the preset power output. If so, close the reheater regulating valve 51 and the compressor 40. The preset power output is the power at which the ORC power generation device can generate electricity stably. In this embodiment, the preset power output is 30%-40% of the rated power output of the turbine generator 10, preferably 30%. At this time, the turbine generator 10 can generate electricity stably, and closing the compressor 40 can reduce energy consumption.

[0048] Finally, when the ORC power generation unit is in any stage and the heat source is no longer supplied or is temporarily interrupted, it is necessary to switch the ORC power generation unit to the ORC shutdown stage. At this time, it is necessary to ensure that the evaporator regulating valve 61, the reheater regulating valve 51, the turbine generator 10 regulating valve, the compressor 40, and the working fluid circulation pump 30 are closed, so as to actively shut down the ORC power generation unit.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. ORC power generation unit, including: A working fluid evaporator (60) is connected to a heat source; Turbine generator (10), the inlet of which is connected to the working fluid outlet of the working fluid evaporator (60) through generator regulating valve (11); A working fluid condenser (20) has its inlet connected to the outlet of the turbine generator (10); A working fluid circulation pump (30) is provided, the inlet of which is connected to the outlet of the working fluid condenser (20), and the outlet of which is connected to the working fluid inlet of the working fluid evaporator (60). Its characteristic is that it further includes: A compressor (40) having its inlet connected to the outlet of the turbine generator (10); The split reheater (50) has its working fluid inlet connected to the outlet of the compressor (40), and the temperature at the working fluid outlet of the split reheater (50) is greater than the temperature at the working fluid outlet of the working fluid evaporator (60). The working fluid outlet of the split reheater (50) is connected to the inlet of the turbine generator (10), and the split reheater (50) is connected to the heat source. The split reheater (50) can absorb heat from the heat source and heat the working fluid.

2. The ORC power generation device according to claim 1, characterized in that, It also includes a reheater regulating valve (51) and an evaporator regulating valve (61). The reheater regulating valve (51) is disposed on the connection flow path between the split reheater (50) and the heat source. The reheater regulating valve (51) is used to change the flow rate of the heat source entering the split reheater (50). The evaporator regulating valve (61) is disposed on the connection flow path between the working fluid evaporator (60) and the heat source. The evaporator regulating valve (61) is used to change the flow rate of the heat source entering the working fluid evaporator (60).

3. The ORC power generation device according to claim 2, characterized in that, It also includes a working fluid preheater (70), the working fluid inlet of which is connected to the outlet of the working fluid circulation pump (30), the working fluid outlet of which is connected to the working fluid inlet of the working fluid evaporator (60), the heat source outlet of the working fluid evaporator (60) is connected to the working fluid preheater (70), and the heat source outlet of the diversion reheater (50) is connected to the working fluid preheater (70). The working fluid preheater (70) can absorb the heat from the heat source and heat the working fluid.

4. The ORC power generation device according to claim 1, characterized in that, An evaporator temperature transmitter (62) and an evaporator pressure transmitter (63) are connected to the working fluid outlet of the working fluid evaporator (60). The evaporator temperature transmitter (62) and the evaporator pressure transmitter (63) are used to detect the temperature and pressure at the working fluid outlet of the working fluid evaporator (60), respectively. A reheater temperature transmitter (52) and a reheater pressure transmitter (53) are connected to the working fluid outlet of the reheater (50). The reheater temperature transmitter (52) and the reheater pressure transmitter (53) are used to detect the temperature and pressure at the working fluid outlet of the reheater (50), respectively.

5. The ORC power generation device according to claim 1, characterized in that, A check valve (41) is provided between the compressor (40) and the split reheater (50), and the check valve (41) is unidirectionally open in the direction from the compressor (40) to the split reheater (50).

6. A control method for an ORC power generation device, characterized in that, The ORC power generation device according to any one of claims 1-5, wherein the control method of the ORC power generation device comprises: During the process of heating the working fluid in the working fluid evaporator (60), it is determined whether the working fluid evaporator (60) can enable the turbine generator (10) to generate power to reach the preset power. If not, the split reheater (50) and the compressor (40) are turned on.

7. The control method for the ORC power generation device according to claim 6, characterized in that, The power output of the turbine generator (10) is determined based on the temperature and pressure at the working fluid outlet of the working fluid evaporator (60) and the power of the working fluid circulation pump (30).

8. The control method for the ORC power generation device according to claim 6, characterized in that, The ORC power generation unit also includes a reheater regulating valve (51), which is disposed on the connection flow path between the split reheater (50) and the heat source. The reheater regulating valve (51) is used to change the flow rate of the heat source entering the split reheater (50). During the operation of the split reheater (50), it is determined whether the temperature value at the working fluid outlet of the split reheater (50) is greater than the temperature value at the working fluid outlet of the working fluid evaporator (60). If not, the opening degree of the reheater regulating valve (51) is increased.

9. The control method for the ORC power generation device according to claim 6, characterized in that, During the operation of the turbine generator (10), it is determined whether the power generation of the turbine generator (10) reaches the preset power generation. If so, the shunt reheater (50) is shut down and the compressor (40) is shut down.

10. The control method for the ORC power generation device according to claim 6, characterized in that, The preset power generation capacity is 30%-40% of the rated power generation capacity of the turbine generator (10), and / or, The operating power of the compressor (40) is 5%-20% of the actual power output of the turbine generator (10).

Images