Turbine preheating device for ROT turbine ORC power generation device

Abstract

The utility model discloses a turbine preheating device for an ROT turbine ORC power generation device, which comprises an evaporator, a turbine expander, a condenser, a working medium pump and a generator, a turbine bypass is arranged between the evaporator and the condenser, a turbine bypass valve is arranged on the turbine bypass, a turbine inlet valve is arranged between the turbine expander and the evaporator, and a turbine outlet valve is arranged on the working medium pump. The turbine inlet valve is connected with the turbine expansion machine through a turbine inlet pipeline, a preheating branch is further arranged between the turbine expansion machine and the evaporator, a preheating control assembly and a preheating monitoring assembly are arranged on the turbine expansion machine, the preheating control assembly is used for controlling preheating, and the preheating monitoring assembly is used for monitoring preheating of the turbine expansion machine. Compared with the prior art, by directly controlling the preheating process of the turbine and accurately judging whether preheating reaches the starting condition or not, risks possibly caused by insufficient preheating are avoided, and an original system cannot be affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to organic rankine cycle power generation equipment field, concretely relates to a turbine preheating device for ROT turbine ORC power generation device. BACKGROUND

[0002] Organic Rankine Cycle (ORC) power generation technology usually uses low-boiling organic working medium, uses its low-boiling point characteristic, obtains higher pressure working medium steam at lower temperature, thereby promotes the rotation of expander, and drives the generator to generate electricity. In the organic Rankine cycle power generation device, due to the low-boiling point characteristic of organic working medium, a part of liquid organic working medium is stored at the bottom or local low point of equipment and pipeline. When the device starts, especially when the cold machine starts, in order to ensure the safety of turbine expansion joint, the liquid working medium in the expander and the pipeline before the expander must be evaporated, that is, turbine preheating is carried out, to prevent liquid impact from causing damage to turbine machinery.

[0003] Generally, when designing the pipeline, the pipeline before the turbine expander can be designed to have a certain slope to prevent local liquid accumulation, but since the turbine inlet valve is arranged before the expander in the ORC system to cut off the expander during preheating of the unit, there is no direct treatment method for the liquid working medium at the bottom of the turbine inlet valve to the expander and the expander. For ROT turbine, due to its unique radial centrifugal expansion design, the more the number of stages of ROT turbine, the larger the impeller disc diameter, which means that the linear velocity of the last stage is larger, and it is more likely to be damaged due to liquid impact, so turbine preheating is more necessary. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at the more the number of stages of ROT turbine, the larger the impeller disc diameter, the larger the linear velocity of the last stage, and the more likely to be damaged due to liquid impact, and proposes a turbine preheating device for ROT turbine ORC power generation device to solve the problem.

[0005] In order to achieve the above target, the utility model adopts the following technical scheme:

[0006] A turbine preheating device for ROT turbine ORC power generation device, comprising an evaporator, a turbine expander, a condenser, a working medium pump and a generator, a turbine bypass is arranged between the evaporator and the condenser, a turbine bypass valve is arranged on the turbine bypass, a turbine inlet valve is arranged between the turbine expander and the evaporator, the turbine inlet valve is connected with the turbine expander through a turbine inlet pipeline, a preheating branch is further arranged between the turbine expander and the evaporator, a preheating control assembly and a preheating monitoring assembly are arranged on the turbine expander, the preheating control assembly is used for controlling preheating, and the preheating monitoring assembly is used for monitoring and judging the preheating state of the turbine expander.

[0007] As a further preferred embodiment of the present application, the preheating monitoring assembly comprises a liquid level switch, a first pressure sensor and a first temperature sensor, the liquid level switch is arranged at the lowest point of the casing of the turbo expander and is used to monitor whether there is working medium in the turbo expander; the first pressure sensor and the first temperature sensor are arranged above the casing of the turbo expander and are used to monitor the superheat degree of the working medium in the turbo expander.

[0008] As a further preferred embodiment of the present application, the preheating control assembly comprises a turbo preheating valve, the turbo preheating valve is arranged on the preset branch, one end of the preheating branch is connected to the bottom of the turbo expander, the other end is arranged on the side of the turbo inlet valve close to the evaporator and is in communication with the pipeline on the side of the turbo inlet valve close to the evaporator, and the installation height of the turbo preheating valve is lower than that of the turbo inlet pipeline.

[0009] As a further preferred embodiment of the present application, the size of the turbo preheating valve is smaller than that of the turbo inlet valve.

[0010] As a further preferred embodiment of the present application, the turbo preheating valve is arranged as a pneumatic valve or an electric valve.

[0011] As a further preferred embodiment of the present application, a blowdown valve is arranged between the turbo preheating valve and the turbo expander and is used for blowdown, thereby facilitating maintenance.

[0012] As a further preferred embodiment of the present application, a second pressure sensor and a second temperature sensor are arranged on the front side of the turbo inlet valve.

[0013] Compared with the prior art, the turbo preheating device for the ROT turbo ORC power generation device has the following beneficial effects:

[0014] 1. The present application directly controls the process of turbo preheating, accurately judges whether the preheating reaches the starting condition, avoids the risk that may occur due to insufficient preheating, and does not affect the original system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural connection schematic diagram of the present application;

[0016] Figure 2 is a preheating control process schematic diagram of the present application.

[0017] Meaning of reference signs in the drawing: 1, evaporator, 2, turbo expander, 3, condenser, 4, working medium pump, 5, generator, 6, turbo inlet valve, 7, turbo bypass valve, 8, turbo preheating valve, 9, blowdown valve, 10, second pressure sensor, 11, second temperature sensor, 12, liquid level switch, 13, first pressure sensor, 14, first temperature sensor. DETAILED DESCRIPTION

[0018] The utility model will be specifically introduced below in combination with the drawings and specific embodiments.

[0019] In combination Figure 1 A turbine preheating device for ROT turbine ORC power generation device, including evaporimeter 1, turbine expander 2, condenser 3, working medium pump 4 and generator 5, turbine bypass is arranged between evaporimeter 1 and condenser 3, turbine bypass valve 7 is arranged on the turbine bypass, turbine inlet valve 6 is arranged between turbine expander 2 and evaporimeter 1, turbine inlet valve 6 is connected with turbine expander 2 through turbine inlet pipeline, second pressure sensor 10 and second temperature sensor 11 are arranged on the front side of turbine inlet valve 6;Preheating branch is also arranged between turbine expander 2 and evaporimeter 1, preheating control assembly and preheating monitoring assembly are arranged on turbine expander 2, the preheating control assembly is used to control preheating, and the preheating monitoring assembly is used to monitor and judge the preheating state of turbine expander 2.

[0020] The preheating monitoring assembly includes liquid level switch 12, first pressure sensor 13 and first temperature sensor 14, the liquid level switch 12 is arranged at the lowest point of the shell of turbine expander 2 and is used to monitor whether there is working medium in turbine expander 2;The first pressure sensor 13 and the first temperature sensor 14 are arranged above the shell of turbine expander 2 and are used to monitor the superheat degree of working medium in turbine expander 2.

[0021] The preheating control assembly includes turbine preheating valve 8, the turbine preheating valve 8 is arranged on the preset branch, one end of the preheating branch is connected with the bottom of turbine expander 2, the other end is arranged on the side of turbine inlet valve 6 close to evaporimeter 1 and is communicated with the pipeline on the side of turbine inlet valve 6 close to evaporimeter 1, and the installation height of the turbine preheating valve 8 is lower than that of the turbine inlet pipeline;The size of the turbine preheating valve 8 is less than that of turbine inlet valve 6;The turbine preheating valve 8 is arranged as a pneumatic valve or an electric valve.

[0022] A blowdown valve 9 is arranged between the turbine preheating valve 8 and turbine expander 2 for blowdown, which is convenient for maintenance.

[0023] Working principle: in combination Figure 2 The ORC device is normally started, the system starts heating, the readings of second pressure sensor 10 and second temperature sensor 11 are monitored, the working medium state before turbine inlet valve 6 is obtained by calculation, and the turbine preheating valve 8 is prepared to be opened after the superheat degree is greater than the set value.

[0024] The turbine preheating valve 8 is opened, the turbine expander 2 starts preheating, and the liquid working medium in the turbine expander 2 starts to evaporate; the state of the liquid level switch 12 is monitored, when the liquid level switch 12 identifies that there is no liquid level, it can be considered that there is no liquid working medium in the turbine expander 2, in order to further ensure the preheating effect, the first pressure sensor 13 and the first temperature sensor 14 are continuously monitored, and the working medium superheat degree in the turbine expander 2 is calculated, when the superheat degree is greater than the set value, it can be considered that the preheating has met the requirements of starting the machine.

[0025] The ORC device is normally connected to the grid, and after the ORC power generation device is successfully connected to the grid, the turbine preheating valve 8 is closed, and the preheating process control is ended.

[0026] The basic principle, main features and advantages of the utility model are shown and described. The skilled in the art should understand that the above examples do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A turbine preheating device for a ROT turbine ORC power generation device, comprising an evaporator (1), a turbine expander (2), a condenser (3), a working medium pump (4) and a generator (5), a turbine bypass is arranged between the evaporator (1) and the condenser (3), a turbine bypass valve (7) is arranged on the turbine bypass, characterized in that, The turbine inlet valve (6) is connected with the turbine expander (2) through a turbine inlet pipeline, and a preheating branch is further arranged between the turbine expander (2) and the evaporator (1).

2. A turbine preheating device for a ROT turbine ORC power plant according to claim 1, characterized in that, The preheating control assembly is used for controlling preheating, and the preheating monitoring assembly is used for monitoring and judging the preheating state of the turbine expander (2).

3. A turbine preheating device for a ROT turbine ORC power generation device according to claim 1, characterized in that, The preheating control assembly comprises a turbine preheating valve (8), which is arranged on the preheating branch, one end of the preheating branch is connected with the bottom of the turbine expander (2), the other end is arranged on the side of the turbine inlet valve (6) close to the evaporator (1), and is in communication with the pipeline on the side of the turbine inlet valve (6) close to the evaporator (1), and the installation height of the turbine preheating valve (8) is lower than that of the turbine inlet pipeline.

4. A turbine preheating device for a ROT turbine ORC power plant according to claim 3, characterized in that The size of the turbine preheating valve (8) is smaller than that of the turbine inlet valve (6).

5. A turbine preheating device for a ROT turbine ORC power generation device according to claim 3, characterized in that, The turbine preheating valve (8) is arranged as a pneumatic valve or an electric valve.

6. A turbine preheating device for a ROT turbine ORC power plant according to claim 3, characterized in that, The turbine preheating valve (8) is arranged as a pneumatic valve or an electric valve.

7. A turbine preheating device for a ROT turbine ORC power generation device according to claim 1, characterized in that, The turbine preheating valve (8) is arranged as a pneumatic valve or an electric valve. The turbine preheating valve (8) is arranged as a pneumatic valve or an electric valve. The turbine preheating valve (8) is arranged as a pneumatic valve or an electric valve.

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