Flexible adjusting system for improving heat supply capacity of multi-low-pressure-cylinder steam turbine of heat supply nuclear power station

Abstract

The invention discloses a heat supply capacity improving flexible adjusting system of a heat supply nuclear power station multi-low-pressure-cylinder steam turbine, belongs to the technical field of heat supply of high-power nuclear power station steam turbines, and aims at solving the problem that the electric load adjusting speed of heat supply of the high-power nuclear power station steam turbines is low. Comprising the steps that secondary loop main steam of the heat supply nuclear power plant enters a high-pressure cylinder through a steam-water separation reheater to do work; exhaust steam of the high-pressure cylinder enters the low-pressure cylinder to do work through the steam-water separation reheater; heating extraction steam is led to a heat supply network heater of an initial station of a heat supply network in the nuclear power station through the heating extraction steam connector; heating extracted steam is led to the cooling steam desuperheater through the low-pressure cylinder cooling steam connector for steam cooling and then led to the low-pressure cylinder; a low-pressure cylinder cooling steam inlet electric butterfly valve is arranged between the low-pressure cylinder and the cooling steam desuperheater, and by controlling the low-pressure cylinder cooling steam inlet electric butterfly valve, a single low-pressure cylinder cutting mode, a double-low-pressure cylinder cutting mode and a three-low-pressure cylinder cutting mode are achieved, and the heat supply capacity is changed. The device is used for heating nuclear power plants.

Description

Technical Field

[0001] The invention relates to a flexible regulation system for improving the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant, belonging to the technical field of steam turbine heating in a high-power nuclear power plant. Background Art

[0002] With the continuous development of modern urbanization, the scale of heating is constantly expanding. At the same time, in order to make efficient use of energy, the heating method is becoming more centralized. At present, large-scale coal-fired cogeneration units are mainly responsible for heating. The main fuel is still fossil fuels. It is difficult to avoid the emission of chemical pollutants such as carbon and sulfur. The livelihood demand for centralized heating has become a major obstacle.

[0003] Compared with other forms of heating such as traditional fossil energy, nuclear power plant heating has very obvious environmental advantages: nuclear fission has a high energy density, and compared with coal-fired boilers of the same power, the annual transportation of nuclear fuel is only about one hundred thousandth of the amount of coal; nuclear energy heating can also significantly reduce carbon dioxide emissions.

[0004] However, existing large-power nuclear power plant steam turbine heating mostly adopts high-pressure cylinder exhaust steam extraction modification to achieve large-scale heating, but the electric load adjustment rate is slower than that of thermal power units. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of slow adjustment rate of electric load of steam turbine heating in large-power nuclear power plants, and to provide a flexible adjustment system for improving heating capacity of multi-low-pressure cylinder steam turbines in heating nuclear power plants.

[0006] The invention discloses a flexible regulation system for improving the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant, wherein the multi-low-pressure cylinder steam turbine comprises a high-pressure cylinder, a first low-pressure cylinder, a second low-pressure cylinder, a third low-pressure cylinder and a steam-water separation reheater;

[0007] The secondary circuit main steam of the heating nuclear power plant enters the high-pressure cylinder through the steam-water separation reheater to perform work;

[0008] The exhaust steam of the high-pressure cylinder passes through the steam-water separation reheater, and then enters the first low-pressure cylinder, the second low-pressure cylinder and the third low-pressure cylinder to perform work;

[0009] A heating extraction steam interface and a low-pressure cylinder cooling steam interface are led out between the high-pressure cylinder and the steam-water separation reheater;

[0010] When there is no need to increase the heating capacity, the heating extraction steam is led to the heating network heater at the first station of the heating network in the nuclear power plant through the heating extraction steam interface;

[0011] When the heating capacity needs to be increased, the heating extraction steam is led to the cooling steam desuperheater through the low-pressure cylinder cooling steam interface for steam cooling, and the cooled steam is led to the first low-pressure cylinder, the second low-pressure cylinder and the third low-pressure cylinder;

[0012] A first low-pressure cylinder cooling steam inlet electric butterfly valve is provided between the first low-pressure cylinder and the cooling steam desuperheater, a second low-pressure cylinder cooling steam inlet electric butterfly valve is provided between the second low-pressure cylinder and the cooling steam desuperheater, and a third low-pressure cylinder cooling steam inlet electric butterfly valve is provided between the third low-pressure cylinder and the cooling steam desuperheater;

[0013] By controlling the first low-pressure cylinder cooling steam inlet electric butterfly valve, the second low-pressure cylinder cooling steam inlet electric butterfly valve and the third low-pressure cylinder cooling steam inlet electric butterfly valve, the single low-pressure cylinder mode, the double low-pressure cylinder mode and the triple low-pressure cylinder mode can be cut off, thereby achieving a change in heating capacity.

[0014] Preferably, the pipeline between the heating steam extraction interface and the heating network heater of the first station of the heating network in the nuclear power plant is also provided with: a safety valve, a pneumatic check valve, a hydraulic fast pipe valve, a shut-off valve and a flow meter.

[0015] Preferably, the pipeline between the low-pressure cylinder cooling steam interface and the cooling steam desuperheater is also provided with: a low-pressure cylinder cooling steam front-end butterfly valve, a low-pressure cylinder cooling steam flowmeter and a cooling steam pressure reducing valve.

[0016] Preferably, a first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve is provided between the first low-pressure cylinder and the steam-water separation reheater;

[0017] A second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve is provided between the second low-pressure cylinder and the steam-water separation reheater;

[0018] A third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve is arranged between the third low-pressure cylinder and the steam-water separation reheater.

[0019] Preferably, the single low-pressure cylinder cutting mode includes: cutting off the first low-pressure cylinder, cutting off the second low-pressure cylinder and cutting off the third low-pressure cylinder;

[0020] The cutting off of the first low-pressure cylinder specifically includes: closing the fully sealed hydraulic quick-opening valve for steam inlet to the first low-pressure cylinder, and introducing the working steam into the first low-pressure cylinder to the heating network heater at the first station of the heating network in the nuclear power plant through the heating extraction interface; opening the cooling steam inlet electric butterfly valve of the first low-pressure cylinder to introduce cooling steam; and the second and third low-pressure cylinders output normally.

[0021] Preferably, the cutting off of the first low-pressure cylinder also includes: achieving micro-output of the first low-pressure cylinder and normal output of the second and third low-pressure cylinders by adjusting the fully sealed hydraulic quick-opening valve for steam inlet to the first low-pressure cylinder.

[0022] Preferably, the dual low-pressure cylinder cutting mode includes: cutting the first low-pressure cylinder and the second low-pressure cylinder, cutting the first low-pressure cylinder and the third low-pressure cylinder, and cutting the second low-pressure cylinder and the third low-pressure cylinder;

[0023] The method of cutting off the first low-pressure cylinder and the second low-pressure cylinder specifically includes: closing the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve and the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve, and the working steam introduced into the first low-pressure cylinder and the second low-pressure cylinder is connected to the heating network heater of the first station of the heating network in the nuclear power plant through the heating extraction interface; opening the first low-pressure cylinder cooling steam inlet electric butterfly valve and the second low-pressure cylinder cooling steam inlet electric butterfly valve, and introducing cooling steam; the third low-pressure cylinder outputs normally.

[0024] Preferably, the cutting off of the first low-pressure cylinder and the second low-pressure cylinder also includes: achieving micro-output of the first low-pressure cylinder and the second low-pressure cylinder and normal output of the third low-pressure cylinder by adjusting the fully sealed hydraulic quick-opening valve for steam inlet to the first low-pressure cylinder and the fully sealed hydraulic quick-opening valve for steam inlet to the second low-pressure cylinder.

[0025] Preferably, the three-low-pressure cylinder removal mode specifically includes:

[0026] Close the fully sealed hydraulic quick-opening valve for steam inlet to the first low-pressure cylinder, the fully sealed hydraulic quick-opening valve for steam inlet to the second low-pressure cylinder and the fully sealed hydraulic quick-opening valve for steam inlet to the third low-pressure cylinder, and lead the working steam in the first low-pressure cylinder, the second low-pressure cylinder and the third low-pressure cylinder to the heating network heater at the first station of the heating network in the nuclear power plant through the heating steam extraction interface;

[0027] Open the first low-pressure cylinder cooling steam inlet electric butterfly valve, the second low-pressure cylinder cooling steam inlet electric butterfly valve and the third low-pressure cylinder cooling steam inlet electric butterfly valve to allow cooling steam to flow in;

[0028] The first low-pressure cylinder, the second low-pressure cylinder and the third low-pressure cylinder all do not exert force.

[0029] Preferably, the three-low-pressure cylinder removal mode also includes:

[0030] By adjusting the fully sealed hydraulic quick-opening valve for steam inlet of the first low-pressure cylinder, the fully sealed hydraulic quick-opening valve for steam inlet of the second low-pressure cylinder and the fully sealed hydraulic quick-opening valve for steam inlet of the third low-pressure cylinder, micro-output of the first low-pressure cylinder, the second low-pressure cylinder and the third low-pressure cylinder can be achieved.

[0031] Advantages of the present invention: The flexible adjustment system for improving the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant described in the present invention adopts high-pressure cylinder exhaust steam for heating, and by adding cooling steam interfaces to multiple low-pressure cylinders, flexible output of the low-pressure cylinders is achieved, thereby improving the heating capacity of the nuclear power plant and the flexibility of load adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a flexible adjustment system for improving the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0036] Embodiment 1:

[0037] Combine the following Figure 1 This embodiment is described. This embodiment is a flexible adjustment system for improving the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant. The multi-low-pressure cylinder steam turbine includes a high-pressure cylinder 1, a first low-pressure cylinder 2, a second low-pressure cylinder 3, a third low-pressure cylinder 4 and a steam-water separation reheater 9;

[0038] The secondary circuit main steam of the heating nuclear power plant enters the high-pressure cylinder 1 through the steam-water separation reheater 9 to perform work;

[0039] The exhaust steam of the high pressure cylinder 1 passes through the steam-water separation reheater 9, and then enters the first low pressure cylinder 2, the second low pressure cylinder 3 and the third low pressure cylinder 4 to perform work;

[0040] A heating steam extraction interface 8 and a low-pressure cylinder cooling steam interface 16 are led out between the high-pressure cylinder 1 and the steam-water separation reheater 9;

[0041] When the heating capacity does not need to be increased, the heating extraction steam is led to the heating network heater 15 at the first station of the heating network in the nuclear power plant through the heating extraction steam interface 8;

[0042] When the heating capacity needs to be increased, the heating extraction steam is led to the cooling steam desuperheater 20 through the low-pressure cylinder cooling steam interface 16 for steam cooling, and the cooled steam is led to the first low-pressure cylinder 2, the second low-pressure cylinder 3 and the third low-pressure cylinder 4;

[0043] A first low-pressure cylinder cooling steam inlet electric butterfly valve 21 is provided between the first low-pressure cylinder 2 and the cooling steam desuperheater 20, a second low-pressure cylinder cooling steam inlet electric butterfly valve 22 is provided between the second low-pressure cylinder 3 and the cooling steam desuperheater 20, and a third low-pressure cylinder cooling steam inlet electric butterfly valve 23 is provided between the third low-pressure cylinder 4 and the cooling steam desuperheater 20;

[0044] By controlling the first low-pressure cylinder cooling steam inlet electric butterfly valve 21, the second low-pressure cylinder cooling steam inlet electric butterfly valve 22 and the third low-pressure cylinder cooling steam inlet electric butterfly valve 23, the single low-pressure cylinder mode, the double low-pressure cylinder mode and the triple low-pressure cylinder mode can be cut off, thereby achieving a change in heating capacity.

[0045] Furthermore, the pipeline between the heating steam extraction interface 8 and the heating network heater 15 of the first station of the heating network in the nuclear power plant is also provided with: a safety valve 10, a pneumatic check valve 11, a hydraulic fast pipe valve 12, a shut-off valve 13 and a flow meter 14.

[0046] Furthermore, the pipeline between the low-pressure cylinder cooling steam interface 16 and the cooling steam desuperheater 20 is also provided with: a low-pressure cylinder cooling steam front butterfly valve 17, a low-pressure cylinder cooling steam flow meter 18 and a cooling steam pressure reducing valve 19.

[0047] Furthermore, a first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5 is provided between the first low-pressure cylinder 2 and the steam-water separation reheater 9;

[0048] A second low-pressure cylinder steam inlet fully sealed hydraulically actuated quick-opening valve 6 is provided between the second low-pressure cylinder 3 and the steam-water separation reheater 9;

[0049] A third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7 is provided between the third low-pressure cylinder 4 and the steam-water separation reheater 9.

[0050] Furthermore, the single low-pressure cylinder removal mode includes: removing the first low-pressure cylinder 2, removing the second low-pressure cylinder 3, and removing the third low-pressure cylinder 4;

[0051] The cutting off of the first low-pressure cylinder 2 specifically includes: closing the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5, and the working steam introduced into the first low-pressure cylinder 2 is connected to the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8; opening the first low-pressure cylinder cooling steam inlet electric butterfly valve 21 to allow cooling steam to pass; the second low-pressure cylinder 3 and the third low-pressure cylinder 4 output normally.

[0052] Furthermore, the removal of the first low-pressure cylinder 2 also includes: by adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5, the first low-pressure cylinder 2 can have a micro output, and the second low-pressure cylinder 3 and the third low-pressure cylinder 4 can have a normal output.

[0053] Furthermore, the dual low-pressure cylinder removal mode includes: removing the first low-pressure cylinder 2 and the second low-pressure cylinder 3, removing the first low-pressure cylinder 2 and the third low-pressure cylinder 4, and removing the second low-pressure cylinder 3 and the third low-pressure cylinder 4;

[0054] The cutting off of the first low-pressure cylinder 2 and the second low-pressure cylinder 3 specifically includes: closing the first low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 5 and the second low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 6, and the working steam introduced into the first low-pressure cylinder 2 and the second low-pressure cylinder 3 is connected to the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8; opening the first low-pressure cylinder cooling steam inlet electric butterfly valve 21 and the second low-pressure cylinder cooling steam inlet electric butterfly valve 22, and introducing cooling steam; the third low-pressure cylinder 4 outputs normally.

[0055] Furthermore, the cutting off of the first low-pressure cylinder 2 and the second low-pressure cylinder 3 also includes: by adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 5 and the second low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 6, the first low-pressure cylinder 2 and the second low-pressure cylinder 3 can have a micro output, and the third low-pressure cylinder 4 can have a normal output.

[0056] Furthermore, the three low-pressure cylinder removal mode specifically includes:

[0057] Close the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5, the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6 and the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7, and introduce the working steam into the first low-pressure cylinder 2, the second low-pressure cylinder 3 and the third low-pressure cylinder 4 through the heating extraction interface 8 to the heating network heater 15 of the first station of the heating network in the nuclear power plant;

[0058] Open the first low-pressure cylinder cooling steam inlet electric butterfly valve 21, the second low-pressure cylinder cooling steam inlet electric butterfly valve 22 and the third low-pressure cylinder cooling steam inlet electric butterfly valve 23 to allow cooling steam to flow in;

[0059] The first low-pressure cylinder 2, the second low-pressure cylinder 3 and the third low-pressure cylinder 4 do not exert force.

[0060] Furthermore, the three-low-pressure cylinder removal mode also includes:

[0061] By adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 5, the second low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 6 and the third low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 7, the micro-output of the first low-pressure cylinder 2, the second low-pressure cylinder 3 and the third low-pressure cylinder 4 can be achieved.

[0062] In the present invention, a high-power nuclear power steam turbine is provided with a high-pressure cylinder 1 and three low-pressure cylinders, namely, a first low-pressure cylinder 2, a second low-pressure cylinder 3, and a third low-pressure cylinder 4. The main steam of the secondary circuit of the nuclear power plant passes through a steam-water separation reheater 9, is cooled by the exhaust steam of the high-pressure cylinder, and then enters the high-pressure cylinder 1 to perform work. After the exhaust steam of the high-pressure cylinder is heated by the main steam of the secondary circuit of the nuclear power plant through the steam-water separation reheater 9, it enters the three low-pressure cylinders through the steam inlet quick opening valves (the first low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 5, the second low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 6, and the third low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve 7) to perform work.

[0063] When there is no need to adjust the electric load, the heating extraction steam is taken from the high-pressure cylinder exhaust steam (between 1 and 9) and is connected to the heating network heater 15 at the first station of the heating network in the nuclear power plant through the heating extraction steam interface 8. A safety valve 10, a pneumatic check valve 11, a hydraulic fast pipe valve 12, an electric shut-off valve 13 and a flow meter 14 are provided on the heating steam pipeline in turn.

[0064] When it is necessary to increase the heating capacity or adjust the electric load, a method for improving the heating capacity and load adjustment flexibility of the nuclear power plant is proposed for high-power nuclear power steam turbines: on the other side of the heating extraction interface 8 on the high-pressure cylinder exhaust, a low-pressure cylinder cooling steam interface 16 is led out, and cooling steam needs to be introduced to prevent the low-pressure cylinder blast effect. The low-pressure cylinder cooling steam front butterfly valve 17, the low-pressure cylinder cooling steam flow meter 18, the cooling steam pressure reducing valve 19, and the cooling steam desuperheater 20 are sequentially arranged on the cooling steam pipeline to adjust the cooling steam parameters to a safe range that meets the needs of the low-pressure cylinder flexibility adjustment, and respectively pass through the first low-pressure cylinder cooling steam steam inlet electric butterfly valve 21, the second low-pressure cylinder cooling steam steam inlet electric butterfly valve 22, and the third low-pressure cylinder cooling steam steam inlet electric butterfly valve 23.

[0065] When flexible output adjustment is required for multiple low-pressure cylinders of a steam turbine in a large-power nuclear power plant, the modes are divided into three modes: cutting off a single low-pressure cylinder, cutting off two low-pressure cylinders, and cutting off three low-pressure cylinders.

[0066] Cut off a single low-pressure cylinder, double low-pressure cylinder output mode:

[0067] Take the removal of the first low-pressure cylinder 2 as an example: close the fully sealed hydraulic quick-opening valve 5 for steam inlet to the first low-pressure cylinder, open the electric butterfly valve 21 for cooling steam inlet to the first low-pressure cylinder to allow cooling steam to pass, and the working steam originally passed into the low-pressure cylinder A enters the heating network heater 15 at the first station of the heating network in the nuclear power plant through the heating extraction interface 8 led out from the high-pressure cylinder exhaust pipe for heating; at this time, the second low-pressure cylinder 3 and the third low-pressure cylinder 4 are working normally; the first low-pressure cylinder 2 can also be micro-output by adjusting the cooling steam parameters and flow rate, as well as adjusting the fully sealed hydraulic quick-opening valve 5 for steam inlet to the first low-pressure cylinder.

[0068] Similarly, the second low-pressure cylinder 3 is cut off, the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6 is closed, and the second low-pressure cylinder cooling steam inlet electric butterfly valve 22 is opened to allow cooling steam to pass. The working steam originally passed into the second low-pressure cylinder 3 enters the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8 led out from the high-pressure cylinder exhaust pipe for heating; at this time, the first low-pressure cylinder 2 and the third low-pressure cylinder 4 are outputting normally; the second low-pressure cylinder 3 can also be micro-output by adjusting the cooling steam parameters and flow, as well as adjusting the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6.

[0069] Similarly, the third low-pressure cylinder 4 is cut off, the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7 is closed, and the third low-pressure cylinder cooling steam inlet electric butterfly valve 23 is opened to allow cooling steam to pass. The working steam originally passed into the third low-pressure cylinder 4 enters the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8 led out from the high-pressure cylinder exhaust pipe for heating; at this time, the first low-pressure cylinder 2 and the second low-pressure cylinder 3 are outputting normally; the third low-pressure cylinder 4 can also be micro-output by adjusting the cooling steam parameters and flow, as well as adjusting the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7.

[0070] When the double low-pressure cylinders are removed and the single low-pressure cylinder is outputting:

[0071] Take the removal of the first low-pressure cylinder 2 and the second low-pressure cylinder 3 as an example: close the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5 and the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6, open the first low-pressure cylinder cooling steam inlet electric butterfly valve 21 and the second low-pressure cylinder cooling steam inlet electric butterfly valve 22 to allow cooling steam to pass, and the working steam originally passed into the first low-pressure cylinder 2 and the second low-pressure cylinder 3 enters the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8 led out from the high-pressure cylinder exhaust pipe for heating; at this time, the third low-pressure cylinder 4 outputs normally; the first low-pressure cylinder 2 and the second low-pressure cylinder 3 can also be micro-output by adjusting the cooling steam parameters and flow, as well as adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5 and the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6.

[0072] Similarly, taking the removal of the first low-pressure cylinder 2 and the third low-pressure cylinder 4 as an example: close the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5 and the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7, open the first low-pressure cylinder cooling steam inlet electric butterfly valve 21 and the third low-pressure cylinder cooling steam inlet electric butterfly valve 23 to allow cooling steam to pass, and the working steam originally passed into the first low-pressure cylinder 2 and the third low-pressure cylinder 4 enters the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8 led out from the high-pressure cylinder exhaust pipe for heating; at this time, the second low-pressure cylinder 3 outputs normally; the first low-pressure cylinder 2 and the third low-pressure cylinder 4 can also be micro-output by adjusting the cooling steam parameters and flow, as well as adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5 and the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7.

[0073] Similarly, taking the removal of the second low-pressure cylinder 3 and the third low-pressure cylinder 4 as an example: close the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6 and the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7, open the second low-pressure cylinder cooling steam inlet electric butterfly valve 22 and the third low-pressure cylinder cooling steam inlet electric butterfly valve 23 to allow cooling steam to pass, and the working steam originally passed into the second low-pressure cylinder 3 and the third low-pressure cylinder 4 enters the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8 led out from the high-pressure cylinder exhaust pipe for heating; at this time, the first low-pressure cylinder 2 has normal output; the second low-pressure cylinder 3 and the third low-pressure cylinder 4 can also be micro-output by adjusting the cooling steam parameters and flow, as well as adjusting the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6 and the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7.

[0074] When three low-pressure cylinders are removed and there is no low-pressure cylinder output:

[0075] Close the fully sealed hydraulic quick-opening valve 5 for steam inlet to the first low-pressure cylinder, the fully sealed hydraulic quick-opening valve 6 for steam inlet to the second low-pressure cylinder, and the fully sealed hydraulic quick-opening valve 7 for steam inlet to the third low-pressure cylinder, open the electric butterfly valve 21 for cooling steam inlet to the first low-pressure cylinder, the electric butterfly valve 22 for cooling steam inlet to the second low-pressure cylinder, and the electric butterfly valve 23 for cooling steam inlet to the third low-pressure cylinder, and the working steam originally introduced into the first low-pressure cylinder 2, the second low-pressure cylinder 3, and the third low-pressure cylinder 4 enters the heating network heater 15 of the first station of the heating network in the nuclear power plant through the heating extraction interface 8 led out from the high-pressure cylinder exhaust pipe for heating. At this time, the first low-pressure cylinder 2, the second low-pressure cylinder 3, and the third low-pressure cylinder 4 are not working.

[0076] Micro-output of the first low-pressure cylinder 2, the second low-pressure cylinder 3, and the third low-pressure cylinder 4 can also be achieved by adjusting the cooling steam parameters and flow rate, as well as adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 5, the second low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 6, and the third low-pressure cylinder steam inlet fully sealed hydraulic quick-opening valve 7.

[0077] In the present invention, only one heating network heater 15 of the first station of the heating network in the nuclear power plant is used as a representative, but multiple ones can be used in the actual process.

[0078] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A flexible regulation system for increasing the heating capacity of a multi-low-pressure steam turbine in a heating nuclear power plant, characterized in that: The multi-low-pressure cylinder steam turbine comprises a high-pressure cylinder (1), a first low-pressure cylinder (2), a second low-pressure cylinder (3), a third low-pressure cylinder (4) and a steam-water separation reheater (9); The secondary circuit main steam of the heating nuclear power plant enters the high-pressure cylinder (1) through the steam-water separation reheater (9) to perform work; The exhaust steam of the high-pressure cylinder (1) passes through the steam-water separation reheater (9) and then enters the first low-pressure cylinder (2), the second low-pressure cylinder (3) and the third low-pressure cylinder (4) to perform work; A heating extraction steam interface (8) and a low-pressure cylinder cooling steam interface (16) are led out between the high-pressure cylinder (1) and the steam-water separation reheater (9); When the heating capacity does not need to be increased, the heating extraction steam is led to the heating network heater (15) at the first station of the heating network in the nuclear power plant through the heating extraction steam interface (8); When the heating capacity needs to be increased, the heating extraction steam is led to the cooling steam desuperheater (20) through the low-pressure cylinder cooling steam interface (16) for steam cooling, and the cooled steam is led to the first low-pressure cylinder (2), the second low-pressure cylinder (3) and the third low-pressure cylinder (4); A first low-pressure cylinder cooling steam inlet electric butterfly valve (21) is provided between the first low-pressure cylinder (2) and the cooling steam desuperheater (20), a second low-pressure cylinder cooling steam inlet electric butterfly valve (22) is provided between the second low-pressure cylinder (3) and the cooling steam desuperheater (20), and a third low-pressure cylinder cooling steam inlet electric butterfly valve (23) is provided between the third low-pressure cylinder (4) and the cooling steam desuperheater (20); By controlling the first low-pressure cylinder cooling steam inlet electric butterfly valve (21), the second low-pressure cylinder cooling steam inlet electric butterfly valve (22) and the third low-pressure cylinder cooling steam inlet electric butterfly valve (23), it is possible to cut off a single low-pressure cylinder mode, cut off a double low-pressure cylinder mode, and cut off a triple low-pressure cylinder mode, thereby achieving a change in heating capacity.

2. A flexible adjustment system for increasing the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 1, characterized in that: The pipeline between the heating steam extraction interface (8) and the heating network heater (15) at the first station of the heating network in the nuclear power plant is also provided with: a safety valve (10), a pneumatic check valve (11), a hydraulic fast pipe valve (12), a shut-off valve (13) and a flow meter (14).

3. The flexible adjustment system for improving the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 1 is characterized in that: The pipeline between the low-pressure cylinder cooling steam interface (16) and the cooling steam desuperheater (20) is also provided with: a low-pressure cylinder cooling steam front-end butterfly valve (17), a low-pressure cylinder cooling steam flow meter (18) and a cooling steam pressure reducing valve (19).

4. A flexible regulation system for increasing heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 1, characterized in that: A first low-pressure cylinder steam inlet fully sealed hydraulically actuated quick-opening valve (5) is provided between the first low-pressure cylinder (2) and the steam-water separation reheater (9); A second low-pressure cylinder steam inlet fully sealed hydraulically actuated quick-opening valve (6) is provided between the second low-pressure cylinder (3) and the steam-water separation reheater (9); A third low-pressure cylinder steam inlet fully sealed hydraulically actuated quick-opening valve (7) is provided between the third low-pressure cylinder (4) and the steam-water separation reheater (9).

5. A flexible adjustment system for increasing the heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 4, characterized in that: The single low-pressure cylinder removal mode includes: removing the first low-pressure cylinder (2), removing the second low-pressure cylinder (3) and removing the third low-pressure cylinder (4); The cutting off of the first low-pressure cylinder (2) specifically includes: closing the fully sealed hydraulic quick-opening valve (5) for steam inlet to the first low-pressure cylinder, and introducing the working steam into the first low-pressure cylinder (2) through the heating extraction interface (8) to the heating network heater (15) of the first station of the heating network in the nuclear power plant; opening the first low-pressure cylinder cooling steam inlet electric butterfly valve (21) to introduce cooling steam; and the second low-pressure cylinder (3) and the third low-pressure cylinder (4) output normally.

6. A flexible regulation system for increasing heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 5, characterized in that: The cutting off of the first low-pressure cylinder (2) also includes: adjusting the fully sealed hydraulic quick-opening valve (5) for the steam inlet of the first low-pressure cylinder to achieve micro-output of the first low-pressure cylinder (2) and normal output of the second low-pressure cylinder (3) and the third low-pressure cylinder (4).

7. A flexible regulation system for increasing heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 4, characterized in that: The dual low-pressure cylinder removal mode includes: removing the first low-pressure cylinder (2) and the second low-pressure cylinder (3), removing the first low-pressure cylinder (2) and the third low-pressure cylinder (4), and removing the second low-pressure cylinder (3) and the third low-pressure cylinder (4); The cutting off of the first low-pressure cylinder (2) and the second low-pressure cylinder (3) specifically comprises: closing the first low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve (5) and the second low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve (6), and introducing the working steam into the first low-pressure cylinder (2) and the second low-pressure cylinder (3) through the heating extraction interface (8) to the heating network heater (15) of the first station of the heating network in the nuclear power plant; opening the first low-pressure cylinder cooling steam inlet electric butterfly valve (21) and the second low-pressure cylinder cooling steam inlet electric butterfly valve (22), and introducing cooling steam; and the third low-pressure cylinder (4) outputs normally.

8. A flexible regulation system for increasing heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 7, characterized in that: The method of cutting off the first low-pressure cylinder (2) and the second low-pressure cylinder (3) further comprises: adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve (5) and the second low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve (6) to achieve micro output of the first low-pressure cylinder (2) and the second low-pressure cylinder (3) and normal output of the third low-pressure cylinder (4).

9. A flexible regulation system for increasing heating capacity of a multi-low-pressure steam turbine in a heating nuclear power plant according to claim 4, characterized in that: The three low-pressure cylinder removal mode specifically includes: The fully sealed hydraulic quick-opening valve (5) for steam inlet to the first low-pressure cylinder, the fully sealed hydraulic quick-opening valve (6) for steam inlet to the second low-pressure cylinder and the fully sealed hydraulic quick-opening valve (7) for steam inlet to the third low-pressure cylinder are closed, and the working steam in the first low-pressure cylinder (2), the second low-pressure cylinder (3) and the third low-pressure cylinder (4) is led to the heating network heater (15) at the first station of the heating network in the nuclear power plant through the heating steam extraction interface (8); Opening the first low-pressure cylinder cooling steam inlet electric butterfly valve (21), the second low-pressure cylinder cooling steam inlet electric butterfly valve (22) and the third low-pressure cylinder cooling steam inlet electric butterfly valve (23) to allow cooling steam to flow in; The first low-pressure cylinder (2), the second low-pressure cylinder (3) and the third low-pressure cylinder (4) all do not produce any force.

10. A flexible regulation system for increasing heating capacity of a multi-low-pressure cylinder steam turbine in a heating nuclear power plant according to claim 9, characterized in that: The three low-pressure cylinder removal mode also includes: By adjusting the first low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve (5), the second low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve (6) and the third low-pressure cylinder steam inlet fully sealed hydraulic quick opening valve (7), the first low-pressure cylinder (2), the second low-pressure cylinder (3) and the third low-pressure cylinder (4) can achieve micro-output.

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