System for adjusting output of heat supply steam turbine generator unit and control method thereof

Abstract

The invention relates to the technical field of thermal power generation control, in particular to a system for adjusting output of a heat supply steam turbine generator unit and a control method thereof. The method is suitable for stable heat supply of the heat supply thermal generator set under the condition that the electric power of the set is greatly changed, and thermoelectric decoupling under the condition that electricity is fixed by electricity is achieved; when the power grid load peak has no peak capacity, the gas turbine can be quickly started to increase power supply; when the load of the power grid is low, steam extraction and heat supply can be carried out on heat consumers (including the heat storage device) by the unit under the lowest stable combustion load, so that the output of the steam turbine generator is reduced, and the power transmission power of the unit to the power grid is reduced. Hydrogen energy is converted into heat and electricity combined supply, an effective mode is provided for absorbing a large amount of hydrogen generated when new energy electric power is surplus, and collaborative development of the new energy and a thermal power generating unit can be promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation control, and in particular to a system for regulating the output of a heating steam turbine generator set and a control method thereof. Background Art

[0002] With the large-scale grid connection of wind and solar power, its unique volatility, intermittency and randomness have affected the safe and stable operation of the power system. In this case, coal-fired power units need to assume the role of maintaining the stable operation of the power system. In order to eliminate the impact of wind and solar power after grid connection and promote the consumption of new energy power, technical measures of hydrogen production by electricity have been adopted when the power and electricity cannot be balanced. When the new energy power supply is at its peak, the consumption of wind and solar power by hydrogen production and storage is achieved. In terms of hydrogen use, hydrogen fuel cells, hydrogen-based formaldehyde and ammonia and other chemical products are currently widely used. In recent years, gas turbine hydrogen-blended power generation technology has also been adopted. The way of utilizing hydrogen energy has entered a new exploration mode. However, there are no relevant literature reports on the use of hydrogen energy to improve the flexibility of coal-fired power generation units in regulating electricity and heat. In order to expand the range of coal-fired power generation units participating in the regulation of grid power, improve the heat supply adaptability of coal-fired power units under different power, and improve the utilization efficiency and flexibility of hydrogen energy, the present invention provides a system for regulating the output of steam turbine generator sets for heating and a control method thereof. Summary of the Invention

[0003] To address the problems in existing technologies, expand the range of coal-fired power units participating in the regulation of grid power, improve the coal-fired power units' adaptability to heat supply under different power levels, and enhance the efficiency and flexibility of hydrogen energy utilization, the present invention provides a system for regulating the output of a heating steam turbine generator set and its control method. The specific technical solution is as follows:

[0004] A system for regulating the output of a heating steam turbine generator set comprises a gas turbine, a gas turbine generator, and a steam heater; the burner of the gas turbine is an oxyhydrogen burner;

[0005] The oxyhydrogen burner is connected to the hydrogen supply pipe and the oxygen supply pipe respectively; the gas turbine is connected to the gas turbine generator; the gas turbine is connected to the steam heater through the gas turbine exhaust pipe; the steam heater is connected to the intermediate pressure cylinder of the heating steam turbine generator set through the intermediate pressure cylinder exhaust pipe, is connected to the low pressure cylinder of the heating steam turbine generator set through the low pressure cylinder inlet pipe, is connected to the steam turbine heat supply pipe through the exhaust delivery pipe and the gas turbine heat supply pipe, and is connected to the low pressure cylinder inlet pipe through the exhaust delivery pipe; one end of the steam turbine heat supply pipe is connected to the intermediate pressure cylinder exhaust pipe, and the other end is connected to the heat user;

[0006] The hydrogen-oxygen burner is used to burn the hydrogen and oxygen delivered by the hydrogen delivery pipe and the oxygen delivery pipe;

[0007] The gas turbine is used to drive a gas turbine generator through combustion products to achieve grid-connected power generation;

[0008] The steam heater is used to receive the exhaust steam of the gas turbine through the gas turbine exhaust pipe, and receive the exhaust steam of the intermediate pressure cylinder through the intermediate pressure cylinder exhaust pipe, and heat the exhaust steam of the intermediate pressure cylinder through the exhaust steam of the gas turbine, and input the heated exhaust steam of the intermediate pressure cylinder into the low pressure cylinder through the low pressure cylinder inlet pipe to perform work, and transport the cooled exhaust steam of the gas turbine to the low pressure cylinder inlet pipe through the exhaust delivery pipe, or transport it to the heat user through the exhaust delivery pipe and the gas turbine heating pipe.

[0009] Preferably, there are a plurality of oxyhydrogen burners, which are evenly arranged around the cross section of the gas turbine.

[0010] Preferably, the system further comprises a hydrogen manifold and an oxygen manifold; the hydrogen manifold is connected to the hydrogen supply pipe, and the oxygen manifold is connected to the oxygen supply pipe; the hydrogen manifold and the oxygen manifold are provided with evenly distributed pipelines for supplying hydrogen and oxygen to each hydrogen-oxygen burner.

[0011] Preferably, the steam heater is a tubular heat exchanger, the outer side of the tube wall of the steam heater is respectively connected to the gas turbine exhaust pipe and the exhaust delivery pipe, and the inner side of the tube wall of the steam heater is respectively connected to the intermediate pressure cylinder exhaust pipe and the low pressure cylinder inlet pipe, and a low pressure cylinder inlet pipe butterfly valve is installed on the low pressure cylinder inlet pipe, and the low pressure cylinder connecting pipe butterfly valve is used to control the steam flow entering the low pressure cylinder.

[0012] Preferably, the hydrogen transmission pipe is provided with a hydrogen regulating valve and a hydrogen mass flow measuring device;

[0013] The oxygen supply pipe is provided with an oxygen regulating valve and an oxygen mass flow measuring device;

[0014] The exhaust pipe is provided with an exhaust pipe temperature measuring device and an exhaust pipe pressure measuring device;

[0015] The combustion engine heating pipe is provided with a combustion engine heating pipe regulating valve.

[0016] Preferably, the exhaust delivery pipe is connected to an exhaust pipe, and an exhaust valve is installed on the exhaust pipe.

[0017] Preferably, the exhaust delivery pipe is provided with a low-pressure cylinder pipe inlet regulating valve; the low-pressure cylinder pipe inlet regulating valve is arranged at one end close to the low-pressure cylinder inlet pipe.

[0018] Preferably, the steam turbine heating pipe is provided with a steam turbine heating pipe check valve and a steam turbine heating pipe regulating valve; the steam turbine heating pipe check valve and the steam turbine heating pipe regulating valve are arranged at one end close to the medium pressure cylinder exhaust pipe.

[0019] A method for regulating the output of a heating steam turbine generator set, using the system, comprises the following steps:

[0020] Step S1: The gas turbine is not started, and the hydrogen regulating valve, oxygen regulating valve, exhaust valve, turbine heating pipe regulating valve, and low-pressure cylinder inlet pipe regulating valve are controlled to be in a closed state;

[0021] Step S2: The steam turbine generator set is connected to the grid for power generation. When the output of the steam turbine generator set reaches the heating condition, the regulating valve of the steam turbine heating pipe is opened to supply heat to the heat user normally through the steam turbine heating pipe.

[0022] Step S3: When the steam turbine generator set needs to increase the external power supply, the pressure in front of the hydrogen regulating valve and the oxygen regulating valve is maintained stable at a certain set pressure value; the drain valve is opened, the hydrogen regulating valve and the oxygen regulating valve are opened, and the hydrogen regulating valve and the oxygen regulating valve are automatically turned on to maintain the mass flow ratio displayed by the hydrogen mass flow measuring device and the oxygen mass flow measuring device at 1:8, the hydrogen-oxygen burner is ignited, and the combustion chamber temperature is controlled at the same time; the gas turbine generator is connected to the grid for power generation; the drain valve is gradually closed, the low-pressure cylinder inlet pipe regulating valve is opened to the full open, and the drain valve is fully closed;

[0023] Step S4: Open the regulating valve of the gas turbine heat supply pipe, increase the opening of the hydrogen regulating valve and the oxygen regulating valve, and gradually close the regulating valve of the steam turbine heat supply pipe until it is completely closed. The heat supply is switched from the steam extraction from the intermediate pressure cylinder exhaust pipe to the steam extraction from the exhaust pipe. The exhaust steam from the intermediate pressure cylinder exhaust pipe is completely transferred to the low pressure cylinder through the steam heater and the low pressure cylinder inlet pipe to perform work, thereby increasing the output of the steam turbine generator.

[0024] In step S5, the openings of the hydrogen regulating valve and the oxygen regulating valve are increased so that the output of the steam turbine generator meets the external power supply power requirement. In step S6, when the output of the steam turbine generator needs to be reduced, the steam turbine heat supply pipe regulating valve is gradually opened, and the small gas turbine heat supply pipe regulating valve is gradually closed, and the heat supply from the exhaust delivery pipe is switched to the steam extraction heat supply from the medium pressure cylinder exhaust pipe; the openings of the hydrogen regulating valve and the oxygen regulating valve are reduced, and the drain valve is gradually opened and fully opened. At the same time, the low pressure cylinder inlet pipe regulating valve and the small gas turbine heat supply pipe regulating valve are fully closed, and the hydrogen regulating valve and the oxygen regulating valve are fully closed. The gas turbine generator is disconnected from the power grid, and the gas turbine stops running.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention is suitable for ensuring stable heat supply for thermal power generators under conditions of significant fluctuations in unit power output, achieving thermal-electric decoupling under the condition of "power determined by electricity." When the grid load is peak and there is no peak capacity, the gas turbine can be quickly started to increase power supply. When the grid load is low, the unit can extract steam to heat users (including heat storage devices) at the lowest stable combustion load to provide heat, thereby reducing the output of the steam turbine generator and the power delivered to the grid. This invention converts hydrogen energy into combined heat and electricity, providing an effective way to consume the large amount of hydrogen generated when there is surplus renewable energy power, and can promote the coordinated development of renewable energy and thermal power generation units. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0028] Figure 1 This is a system principle diagram of the present invention.

[0029] in:

[0030] Gas turbine 1, oxyhydrogen burner 2, gas turbine generator 3, gas turbine exhaust pipe 4, steam heater 5, exhaust delivery pipe 6, exhaust delivery pipe temperature measuring device 7, exhaust delivery pipe pressure measuring device 8, drain pipe 9, drain valve 10, low-pressure cylinder inlet pipe regulating valve 11, low-pressure cylinder inlet pipe 12, steam turbine generator 13, low-pressure cylinder 14, low-pressure cylinder steam inlet pressure measuring device 15, gas turbine heating pipe 16, intermediate-pressure cylinder exhaust pipe 17, intermediate-pressure cylinder 18, steam turbine heating pipe check valve 19, steam turbine heating pipe regulating valve 20, steam turbine heating pipe 21, gas turbine heating pipe regulating valve 22, heat user 23, hydrogen regulating valve 24, hydrogen mass flow measuring device 25, oxygen regulating valve 26, oxygen mass flow measuring device 27, hydrogen header 28, oxygen header 29, hydrogen supply pipe 30, oxygen supply pipe 31, low-pressure cylinder inlet pipe butterfly valve 32. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0033] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0034] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0035] Example 1:

[0036] like Figure 1 As shown, this embodiment provides a system for regulating the output of a heating steam turbine generator set, comprising a gas turbine 2, a gas turbine generator 3, and a steam heater 5; the burner of the gas turbine 2 is an oxyhydrogen burner 1;

[0037] The oxyhydrogen burner 1 is connected to the hydrogen supply pipe 30 and the oxygen supply pipe 31 respectively; the gas turbine 2 is connected to the gas turbine generator 3; the gas turbine 2 is connected to the steam heater 5 via the gas turbine exhaust pipe 4; the steam heater 5 is connected to the intermediate pressure cylinder 18 of the heating steam turbine generator set via the intermediate pressure cylinder exhaust pipe 17, is connected to the low pressure cylinder 14 of the heating steam turbine generator set via the low pressure cylinder inlet pipe 12, is connected to the steam turbine heat supply pipe 21 via the exhaust gas delivery pipe 6 and the gas turbine heat supply pipe 16, and is also connected to the low pressure cylinder inlet pipe 12 via the exhaust gas delivery pipe 6; one end of the steam turbine heat supply pipe 21 is connected to the intermediate pressure cylinder exhaust pipe 17, and the other end is connected to the heat user 23;

[0038] The oxyhydrogen burner 1 is used to burn the hydrogen and oxygen delivered by the hydrogen delivery pipe 30 and the oxygen delivery pipe 31;

[0039] The gas turbine 2 is used to drive the gas turbine generator 3 through combustion products to achieve grid-connected power generation; the steam heater is used to receive the first high-temperature exhaust steam of the gas turbine 2 through the gas turbine exhaust pipe 4, and receive the exhaust steam of the intermediate-pressure cylinder 18 through the intermediate-pressure cylinder exhaust pipe 17, and heat the exhaust steam of the intermediate-pressure cylinder 18 through the exhaust steam of the gas turbine 2, and input the heated exhaust steam of the intermediate-pressure cylinder 18 into the low-pressure cylinder 14 through the low-pressure cylinder inlet pipe 12 to perform work, and transport the cooled exhaust steam of the gas turbine 2 to the low-pressure cylinder inlet pipe 12 through the exhaust delivery pipe 6, or transport it to the heat user through the exhaust delivery pipe 6 and the gas turbine heating pipe 16.

[0040] In a preferred embodiment, multiple oxyhydrogen burners 1 are evenly spaced around the cross-section of the gas turbine 2. The system also includes a hydrogen manifold 28 and an oxygen manifold 29. The hydrogen manifold 28 is connected to a hydrogen supply pipe 30, and the oxygen manifold 29 is connected to an oxygen supply pipe 31. Both the hydrogen manifold 28 and the oxygen manifold 29 are ring-shaped stainless steel pipes resistant to hydrogen embrittlement, with evenly distributed pipes for supplying hydrogen and oxygen to each oxyhydrogen burner 2.

[0041] In a preferred embodiment, the steam heater 5 is a tubular heat exchanger. The outer side of the steam heater 5 is connected to the gas turbine exhaust pipe 4 and the exhaust duct 6, respectively. The inner side of the steam heater 5 is connected to the intermediate pressure cylinder exhaust pipe 17 and the low pressure cylinder inlet pipe 12, respectively. A low pressure cylinder inlet pipe butterfly valve 32 is installed on the low pressure cylinder inlet pipe 12. The low pressure cylinder connecting pipe butterfly valve 32 is used to control the steam flow entering the low pressure cylinder 14.

[0042] As a preferred embodiment, a hydrogen regulating valve 24 and a hydrogen mass flow measuring device 25 are provided on the hydrogen transmission pipe 30; the mass flow rate of hydrogen transported on the hydrogen transmission pipe 30 can be adjusted by adjusting the opening of the hydrogen regulating valve 24, and the hydrogen mass flow measuring device 25 can collect the mass flow rate of hydrogen transported on the hydrogen transmission pipe 30 and transmit it to the control system.

[0043] The oxygen supply pipe 31 is provided with an oxygen regulating valve 26 and an oxygen mass flow measuring device 27; the mass flow of oxygen delivered on the oxygen supply pipe 31 can be adjusted by adjusting the opening of the oxygen regulating valve 26, and the oxygen mass flow measuring device 27 can collect the mass flow of oxygen delivered and transmit it to the control system.

[0044] Exhaust duct 6 is equipped with an exhaust duct temperature measuring device 7 and an exhaust duct pressure measuring device 8. These devices respectively measure the temperature and pressure of the second high-temperature exhaust steam flowing into the exhaust duct 6 after heat exchange in the steam heater 5 and transmit these to the control system. Exhaust duct temperature measuring device 7 and exhaust duct pressure measuring device 8 are located near the inlet end of the exhaust duct 6.

[0045] The combustion engine heating pipe 16 is provided with a combustion engine heating pipe regulating valve 22 . By adjusting the opening of the combustion engine heating pipe regulating valve 22 , the flow rate of the second high-temperature exhaust steam flowing from the exhaust delivery pipe 6 into the combustion engine heating pipe 16 can be adjusted.

[0046] Among them, the exhaust pipe temperature measuring device 7 adopts E-type or K-type high-precision thermocouple, and the exhaust pipe pressure measuring device 8 and the low-pressure cylinder steam inlet pressure measuring device 15 adopt 0.1-level high-precision pressure transmitters.

[0047] The hydrogen mass flow measuring device 25 measures the hydrogen mass flow through a welded corner pressure plate and temperature and pressure measuring devices. The oxygen mass flow measuring device 27 measures the oxygen mass flow through a welded corner pressure plate and temperature and pressure measuring devices.

[0048] As a preferred embodiment, the exhaust delivery pipe 6 is connected to the exhaust pipe 9, and the exhaust pipe 9 is equipped with an exhaust valve 10. The exhaust valve 10 can be opened to discharge the second high-temperature exhaust steam to the air, and the opening of the exhaust valve 10 can be adjusted to adjust the flow rate of the second high-temperature exhaust steam discharged to the air.

[0049] As a preferred embodiment, the exhaust pipe 6 is equipped with a low-pressure cylinder inlet regulating valve 11. This valve is located near the end of the low-pressure cylinder inlet pipe 12 and is located after the exhaust pipe temperature measuring device 7, the exhaust pipe pressure measuring device 8, the exhaust pipe 9, and the combustion engine heating pipe 16. Adjusting the opening of the low-pressure cylinder inlet regulating valve 11 can adjust the flow rate of the second high-temperature exhaust steam entering the low-pressure cylinder inlet pipe 12.

[0050] As a preferred embodiment, a steam turbine heating pipe check valve 19 and a steam turbine heating pipe regulating valve 20 are provided on the steam turbine heating pipe 21; the steam turbine heating pipe check valve 19 and the steam turbine heating pipe regulating valve 20 are arranged at one end close to the intermediate pressure cylinder exhaust pipe 17, that is, they are arranged between the connection between the combustion engine heating pipe 16 and the steam turbine heating pipe 21 and the intermediate pressure cylinder exhaust pipe 17. By adjusting the opening of the steam turbine heating pipe regulating valve 20, the flow rate of the intermediate pressure cylinder exhaust steam input from the intermediate pressure cylinder exhaust pipe 17 into the steam turbine heating pipe 21 can be adjusted.

[0051] The operating principle of the system for regulating the output of the heating steam turbine generator set of the present invention is as follows:

[0052] Hydrogen and oxygen are delivered to the hydrogen manifold 28 and oxygen manifold 29, respectively, through the hydrogen delivery pipe 30 and the oxygen delivery pipe 31. The mass flow rate of hydrogen delivered on the hydrogen delivery pipe 30 can be adjusted by adjusting the opening of the hydrogen regulating valve 24. The hydrogen mass flow rate measuring device 25 can collect the mass flow rate of hydrogen delivered on the hydrogen delivery pipe 30 and transmit it to the control system. The mass flow rate of oxygen delivered on the oxygen delivery pipe 31 can be adjusted by adjusting the opening of the oxygen regulating valve 26. The oxygen mass flow rate measuring device 27 can collect the mass flow rate of oxygen delivered and transmit it to the control system.

[0053] Hydrogen and oxygen are respectively delivered to each oxyhydrogen burner 2 through the hydrogen header 28 and the oxygen header 29. The hydrogen and oxygen are burned together in the oxyhydrogen burner 2 to produce combustion products. Under the action of the combustion products, the gas turbine 2 drives the gas turbine generator 3, and the gas turbine generator 3 is connected to the grid to generate electricity.

[0054] The first high-temperature exhaust steam from gas turbine 2 enters the outer wall of the steam heater 5 through gas turbine exhaust pipe 4. The exhaust steam from intermediate-pressure cylinder 18 enters the inner wall of the steam heater 5 through intermediate-pressure cylinder exhaust pipe 17. Inside the steam heater 5, the first high-temperature exhaust steam heats the exhaust steam from intermediate-pressure cylinder 18. The heated exhaust steam then enters the low-pressure cylinder 14 through the low-pressure cylinder inlet pipe 12 to perform work, thereby increasing the output of the steam turbine generator 13. The first high-temperature exhaust steam, after heat exchange in the steam heater 5, becomes the second high-temperature exhaust steam and flows into the exhaust duct 6. Adjusting the opening of the low-pressure cylinder connecting pipe butterfly valve 32 can control the steam flow rate entering the low-pressure cylinder 14.

[0055] The exhaust pipe temperature measuring device 7 and the exhaust pipe pressure measuring device 8 respectively collect the temperature and pressure of the second high-temperature exhaust steam flowing into the exhaust pipe 6 after heat exchange in the steam heater 5, and transmit them to the control system.

[0056] Exhaust steam from the intermediate pressure cylinder 18 enters the turbine heat supply pipe 21 through the intermediate pressure cylinder exhaust pipe 17 and supplies heat to heat users 23, which are heat users in the heat pipe network. Opening the turbine heat supply pipe regulating valve 20 allows heat to be supplied to heat users 23 through the turbine heat supply pipe 21. The flow rate of exhaust steam from the intermediate pressure cylinder 18 entering the turbine heat supply pipe 21 can be adjusted by opening the turbine heat supply pipe check valve 19 and adjusting the opening of the turbine heat supply pipe regulating valve 20.

[0057] The second high-temperature exhaust steam can enter the gas turbine heating pipe 16 through the exhaust gas delivery pipe 6, and then enter the steam turbine heating pipe 21 and provide heat to the heat user 23. By adjusting the opening of the gas turbine heating pipe regulating valve 22, the flow rate of the second high-temperature exhaust steam flowing from the exhaust gas delivery pipe 6 into the gas turbine heating pipe 16 can be adjusted.

[0058] The second high-temperature exhaust steam can enter the low-pressure cylinder inlet pipe 12 through the exhaust delivery pipe 6. The flow rate of the second high-temperature exhaust steam entering the low-pressure cylinder inlet pipe 12 can be adjusted by adjusting the opening of the low-pressure cylinder pipe regulating valve 11.

[0059] The second high-temperature exhaust steam can be discharged into the air through the exhaust pipe 9. The second high-temperature exhaust steam can be discharged into the air by opening the exhaust valve 10. The flow rate of the second high-temperature exhaust steam discharged into the air can be adjusted by adjusting the opening of the exhaust valve 10.

[0060] When the grid load is at its peak and there is no peak capacity, the gas turbine 2 can be started quickly, and the exhaust steam of the intermediate pressure cylinder 18 can be heated by the first high-temperature exhaust steam and input into the low-pressure cylinder 14 to perform work, thereby increasing the output of the steam turbine generator 13 to increase the power supply; when the grid load is low, the unit can extract steam to supply heat to the heat user 23 including the heat storage device at the lowest stable combustion load, that is, adjust the opening of the steam turbine heating pipe regulating valve 20 or the gas turbine heating pipe regulating valve 22, increase the heat supply to the heat user 23, thereby reducing the output of the steam turbine generator 13, and thus reducing the electric power transmitted to the grid.

[0061] Example 2:

[0062] The example uses a 1.7MW gas turbine and a 600MW steam turbine. The 600MW steam turbine is model N600-24.2 / 566 / 566, supercritical, reheated, impulse, single-shaft, three-cylinder, four-exhaust, extraction-condensing. The main steam pressure and temperature are 24.2 MPa and 566°C, respectively. The intermediate pressure cylinder inlet steam pressure and temperature are 4.002 MPa and 566°C, respectively. The low-pressure cylinder exhaust back pressure is 5.05 kPa. The heating steam parameter pressure is 0.6 MPa.

[0063] This embodiment provides a method for regulating the output of a heating steam turbine generator set, and the system used includes the following steps: Step S1, the gas turbine 2 is not started, and the hydrogen regulating valve 24, the oxygen regulating valve 26, the drain valve 10, the combustion engine heating pipe regulating valve 22, and the low-pressure cylinder inlet pipe regulating valve 11 are controlled to be in a closed state;

[0064] Step S2: The steam turbine generator set is connected to the grid for power generation. When the output of the steam turbine generator set reaches the heating condition, that is, the pressure of the heating extraction port reaches the heating parameter requirement of 0.6 MPa, the steam turbine heating pipe regulating valve 20 is opened to supply heat to the heat user 23 through the steam turbine heating pipe 21.

[0065] Step S3: When the steam turbine generator set needs to increase the external power supply, the pressure in front of the hydrogen regulating valve 24 is maintained at 3.0 MPa, and the pressure in front of the oxygen regulating valve 26 is maintained at 3.0 MPa; the drain valve 10 is opened, and the hydrogen regulating valve 24 and the oxygen regulating valve 26 are opened. The hydrogen regulating valve 24 and the oxygen regulating valve 26 are automatically turned on to maintain the mass flow ratio displayed by the hydrogen mass flow measuring device 25 and the oxygen mass flow measuring device 27 at 1:8, and one of the hydrogen-oxygen burners 2 is ignited, and then the other hydrogen-oxygen burners 2 are gradually ignited, while the combustion chamber temperature is controlled at 1580-1650° C.; the gas turbine generator 3 is connected to the grid for power generation; the drain valve 10 is gradually closed, the low-pressure cylinder inlet pipe regulating valve 11 is opened to the full open, and the drain valve 10 is fully closed;

[0066] Step S4: Open the gas turbine heat supply pipe regulating valve 22, increase the openings of the hydrogen regulating valve 24 and the oxygen regulating valve 26, and gradually close the steam turbine heat supply pipe regulating valve 20 until it is completely closed. The heat supply is switched from the steam extraction from the intermediate pressure cylinder exhaust pipe 17 to the steam extraction from the exhaust delivery pipe 6. The exhaust steam from the intermediate pressure cylinder exhaust pipe 17 enters the low pressure cylinder 14 through the steam heater 5 and the low pressure cylinder inlet pipe 12 to perform work, thereby increasing the output of the steam turbine generator 13.

[0067] Step S5, increasing the opening of the hydrogen regulating valve 24 and the oxygen regulating valve 26 to increase the output of the steam turbine generator 13 to meet the power generation instruction requirement issued by the power grid to the unit;

[0068] In step S6, when the output of the steam turbine generator 13 needs to be reduced, the steam turbine heat supply pipe regulating valve 20 is gradually opened, and the gas turbine heat supply pipe regulating valve 22 is gradually closed, and the steam extraction heat supply from the exhaust delivery pipe 6 is switched to the steam extraction heat supply from the intermediate pressure cylinder exhaust pipe 17; the opening of the hydrogen regulating valve 24 and the oxygen regulating valve 26 are reduced, and the drain valve 10 is gradually opened and fully opened. At the same time, the low pressure cylinder inlet pipe regulating valve 11 and the small gas turbine heat supply pipe regulating valve 22 are fully closed, and the hydrogen regulating valve 24 and the oxygen regulating valve 26 are fully closed. The gas turbine generator 3 is disconnected from the power grid, and the gas turbine 2 stops running.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A system for regulating the output of a heating steam turbine generator set, characterized in that: It comprises a gas turbine (2), a combustion engine generator (3), and a steam heater (5); the burner of the gas turbine (2) is an oxyhydrogen burner (1); The hydrogen-oxygen burner (1) is connected to a hydrogen delivery pipe (30) and an oxygen delivery pipe (31) respectively; the gas turbine (2) is connected to a combustion engine generator (3); the gas turbine (2) is connected to a steam heater (5) via a gas turbine exhaust pipe (4); the steam heater (5) is connected to an intermediate-pressure cylinder (18) of a heating steam turbine generator set via an intermediate-pressure cylinder exhaust pipe (17), is connected to a low-pressure cylinder (14) of a heating steam turbine generator set via a low-pressure cylinder inlet pipe (12), is connected to a steam turbine heat supply pipe (21) via an exhaust delivery pipe (6) and a combustion engine heat supply pipe (16), and is connected to a low-pressure cylinder inlet pipe (12) via an exhaust delivery pipe (6); one end of the steam turbine heat supply pipe (21) is connected to an intermediate-pressure cylinder exhaust pipe (17), and the other end is connected to a heat user (23); The hydrogen-oxygen burner (1) is used to burn hydrogen and oxygen delivered by the hydrogen delivery pipe (30) and the oxygen delivery pipe (31); The gas turbine (2) is used to drive a gas turbine generator (3) through combustion products to achieve grid-connected power generation; The steam heater is used to receive exhaust steam from the gas turbine (2) through the gas turbine exhaust pipe (4), and to receive exhaust steam from the intermediate-pressure cylinder (18) through the intermediate-pressure cylinder exhaust pipe (17), and to heat the exhaust steam from the intermediate-pressure cylinder (18) through the exhaust steam from the gas turbine (2), and to input the heated exhaust steam from the intermediate-pressure cylinder (18) into the low-pressure cylinder (14) through the low-pressure cylinder inlet pipe (12) to perform work, and to transmit the cooled exhaust steam from the gas turbine (2) to the low-pressure cylinder inlet pipe (12) through the exhaust delivery pipe (6), or to transmit it to a heat user through the exhaust delivery pipe (6) and the combustion engine heating pipe (16).

2. A system for regulating the output of a heating steam turbine generator set according to claim 1, characterized in that: There are a plurality of oxyhydrogen burners (1) which are evenly arranged around the cross section of the gas turbine (2).

3. The system for regulating the output of a heating steam turbine generator set according to claim 2, characterized in that: The system further comprises a hydrogen manifold (28) and an oxygen manifold (29); the hydrogen manifold (28) is connected to a hydrogen delivery pipe (30), and the oxygen manifold (29) is connected to an oxygen delivery pipe (31); and the hydrogen manifold (28) and the oxygen manifold (29) are provided with uniformly distributed pipelines for delivering hydrogen and oxygen to each hydrogen-oxygen burner (2).

4. The system for regulating the output of a heating steam turbine generator set according to claim 1, characterized in that: The steam heater (5) is a tubular heat exchanger. The outer side of the tube wall of the steam heater (5) is respectively connected to the gas turbine exhaust pipe (4) and the exhaust delivery pipe (6). The inner side of the tube wall of the steam heater (5) is respectively connected to the medium-pressure cylinder exhaust pipe (17) and the low-pressure cylinder inlet pipe (12). A low-pressure cylinder inlet pipe butterfly valve (32) is installed on the low-pressure cylinder inlet pipe (12). The low-pressure cylinder connecting pipe butterfly valve (32) is used to control the steam flow entering the low-pressure cylinder (14).

5. The system for regulating the output of a heating steam turbine generator set according to claim 1, characterized in that: The hydrogen transmission pipe (30) is provided with a hydrogen regulating valve (24) and a hydrogen mass flow measuring device (25); The oxygen supply pipe (31) is provided with an oxygen regulating valve (26) and an oxygen mass flow measuring device (27); The exhaust delivery pipe (6) is provided with an exhaust delivery pipe temperature measuring device (7) and an exhaust delivery pipe pressure measuring device (8); The combustion engine heating pipe (16) is provided with a combustion engine heating pipe regulating valve (22).

6. The system for regulating the output of a heating steam turbine generator set according to claim 1, characterized in that: The exhaust delivery pipe (6) is connected to an exhaust pipe (9), and an exhaust valve (10) is installed on the exhaust pipe (9).

7. The system for regulating the output of a heating steam turbine generator set according to claim 1, characterized in that: The exhaust delivery pipe (6) is provided with a low-pressure cylinder pipe inlet regulating valve (11); the low-pressure cylinder pipe inlet regulating valve (11) is provided at one end close to the low-pressure cylinder inlet pipe (12).

8. The system for regulating the output of a heating steam turbine generator set according to claim 1, characterized in that: The turbine heating pipe (21) is provided with a turbine heating pipe check valve (19) and a turbine heating pipe regulating valve (20); the turbine heating pipe check valve (19) and the turbine heating pipe regulating valve (20) are arranged at one end close to the intermediate pressure cylinder exhaust pipe (17).

9. A method for regulating the output of a heating steam turbine generator set, characterized in that: The system according to any one of claims 1 to 8 comprises the following steps: Step S1, the gas turbine (2) is not started, and the hydrogen regulating valve (24), the oxygen regulating valve (26), the exhaust valve (10), the combustion engine heating pipe regulating valve (22), and the low-pressure cylinder inlet pipe regulating valve (11) are controlled to be in a closed state; Step S2, the steam turbine generator set is connected to the grid for power generation. When the output of the steam turbine generator set reaches the heating condition, the steam turbine heating pipe regulating valve (20) is opened to supply heat to the heat user (23) through the steam turbine heating pipe (21); Step S3, when the steam turbine generator set needs to increase the external power supply, the pressure before the hydrogen regulating valve (24) and the oxygen regulating valve (26) is maintained stable at a certain set pressure value; the drain valve (10) is opened, the hydrogen regulating valve (24) and the oxygen regulating valve (26) are opened, the hydrogen regulating valve (24) and the oxygen regulating valve (26) are automatically turned on, so that the mass flow ratio displayed by the hydrogen mass flow measuring device (25) and the oxygen mass flow measuring device (27) is maintained at 1:8, the hydrogen-oxygen burner (2) is ignited, and the combustion chamber temperature is controlled at the same time; the combustion engine generator (3) is connected to the grid for power generation; the drain valve (10) is gradually closed, the low-pressure cylinder inlet pipe regulating valve (11) is opened to be fully opened, and the drain valve (10) is fully closed; Step S4, opening the combustion engine heat supply pipe regulating valve (22), increasing the opening of the hydrogen regulating valve (24) and the oxygen regulating valve (26), gradually closing the steam turbine heat supply pipe regulating valve (20) to fully close, switching from the steam extraction heat supply from the intermediate pressure cylinder exhaust pipe (17) to the steam extraction heat supply from the exhaust delivery pipe (6); all the exhaust steam from the intermediate pressure cylinder exhaust pipe (17) enters the low pressure cylinder (14) through the steam heater (5) and the low pressure cylinder inlet pipe (12) to perform work, and the output of the steam turbine generator (13) increases; Step S5, increasing the opening of the hydrogen regulating valve (24) and the oxygen regulating valve (26) so that the output of the steam turbine generator (13) meets the external power supply power requirement; Step S6, when it is necessary to reduce the output of the steam turbine generator (13), gradually open the steam turbine heat supply pipe regulating valve (20), gradually close the small combustion turbine heat supply pipe regulating valve (22), and switch the steam extraction heat supply from the exhaust delivery pipe (6) to the medium pressure cylinder exhaust pipe (17) steam extraction heat supply; reduce the opening of the hydrogen regulating valve (24) and the oxygen regulating valve (26), gradually open and fully open the drain valve (10), and at the same time fully close the low pressure cylinder inlet pipe regulating valve (11) and the small combustion turbine heat supply pipe regulating valve (22), fully close the hydrogen regulating valve (24) and the oxygen regulating valve (26), and the combustion turbine generator (3) is disconnected from the power grid, and the gas turbine (2) stops running.

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